Showing papers on "Pressure angle published in 2018"
TL;DR: In this article, the influence of gear eccentricities on the dynamic performance of a 4-planar PGT is studied. And the mesh stiffness is calculated by the energy potential method, which can result in the change of line of action, pressure angle, contact ratio and mesh positions.
Abstract: Gear eccentricities are one of the practical types of the manufacturing errors that affect the dynamic performance of a planetary gear train (PGT). Previous research about the effects of the gear eccentricities is abundant, and many of them focus on the parallel shaft gear set. However, almost none of them have considered the influence of the gear eccentricities on the mesh stiffness. In fact, the existence of the gear eccentricities can change the center distance and the mesh positions of a meshing gear pair, which will directly affect the mesh stiffness. Situation can be even more complex for the PGT with either sun gear eccentricities or planet gear eccentricities or both of them. Based on that, a new dynamic model of a PGT with gear eccentricities is established. The planar motions of the PGT and the mesh stiffness are integrated and solved simultaneously where the mesh stiffness is determined by the actual mesh positions of the meshing gear pair. The mesh stiffness is calculated by the energy potential method. The time-varying center distance caused by the gear eccentricities is also considered, which can result in the change of line of action, pressure angle, contact ratio and mesh positions. The influence of gear eccentricities on the dynamic performance of a 4-planet PGT is studied. Some useful results are derived at last.
61 citations
TL;DR: In this article, the effect of different gear parameters like pinion teeth number, pressure angle, addendum height and gear ratio on tooth wear along the line of action on non-standard HCR spur gear has been evaluated and discussed.
22 citations
01 Dec 2018
TL;DR: An analysis of a novel 3-SPR parallel manipulator with 3 degrees-of-freedom that is characterized by a mobile platform consisting of a single point where all the three open-loop kinematic chains converge to investigate the influence of the mobile platform radius over transmission index and workspace volume.
Abstract: This paper presents an analysis of a novel 3-SPR parallel manipulator with 3 degrees-of-freedom that is characterized by a mobile platform consisting of a single point where all the three open-loop...
19 citations
TL;DR: In this paper, a conical gear rolling process using conical gears was proposed, which consists of three stages, namely, tooth graduation, tooth forming and tooth finishing, and the proposed process achieved better uniform tooth graduation and refining of the tooth profile.
15 citations
TL;DR: In this article, a coupled dynamic model for the gear transmission system of wheel reducer used in electric vehicle was developed by combining the acoustics finite element modal for housing in Virtual Lab and the coupled dynamic models for gear transmission systems.
Abstract: Considering flexible shafts, a coupled dynamic model for the gear transmission system of wheel reducer used in electric vehicle was developed. By combining the acoustics finite element modal for housing in Virtual Lab and the coupled dynamic model for gear transmission system, a simulation method was proposed for the prediction of the radiation noise for the wheel reducer. Then, the effects of different macro geometry gear parameters including pressure angle and helical angle on the dynamic response and radiation noise were investigated under the rated working condition. Results show that the peak-peak value of the transmission error dramatically falls in the starting zone, followed by an upward trend with the increase of the pressure angle for the low speed stage gear pair. The minimum transmission error and vibration acceleration occur when the pressure angle is 17°. The increase of the pressure angle does not affect the sound pressure level at the field point obviously. The design case with 17° pressure angle shows the optimum radiation noise level, which is 4.41dB less than the original model. Compared to the pressure angle, the helix angle has a major influence on the transmission error, vibration acceleration and acoustic radiation noise. With the increase of the helix angle, the time-varying transmission error curve becomes more smooth with a lower peak-peak value. Besides, the increase of helix angle results in lowering the varying and fluctuating trend of both vibration acceleration and acoustic radiation noise. The design case with 24° helix angle shows the prime radiation noise level, which is 7 dB less than the original scheme.
10 citations
TL;DR: The analytical results indicate that good kinematic and dynamic performance can be guaranteed with the suggested design approach, and the mutual effect between the dexterity and new pressure angle is analyzed.
Abstract: The kinematic optimization of a type of parallel manipulator is addressed. Based on the kinematic analysis, the pressure angles within a limb and among the limbs are introduced, which have definite...
9 citations
31 Mar 2018
TL;DR: The result revealed that at higher pressure angle of 50°, a better length of the curve was equally generated as seen from the plot, which equally validate the direct proportionality of length of curve as the square of tan a from equation.
Abstract: Numerical modeling and values of the involutes curve length for a spur gear has been carried out using polar coordinate principles and application of calculus theorems. A set of values for base radius of the gear were considered from 10mm, 20mm, 30mm, 40mm and 50mm. The study also considered a pressure angle of 10°, 20°, 30°, 40°, and 50° for this set of values. The result of the length of involutes curve obtained at a pressure angle of 10° showed a significant increase in the length of the curve generated as the base radius increases that is at10° and for the set of the base radius values, the length obtained are:0.1555mm,0.311mm,0.4665mm,0.622mm and 0.7775mm. The result also revealed that at higher pressure angle of 50°, a better length of the curve was equally generated as seen from the plot.That is at 50° and with the base radius of 10mm, 20mm, 30mm, 40mm, and 50mm, the corresponding length of involutes are 7.1014mm, 14.203mm, 21.3045mm, 28.406mm and 35.5075mm. This equally validate the direct proportionality of length of curve as the square of tan a from equation.
7 citations
TL;DR: In this paper, the authors present the geometry, cinematic, forces and yields of modern toothed wheels in the form of newly synthesized relations on modern bases, which can be considered among those of the optimal dynamic synthesis of the gears.
Abstract: In today's mechanical transmissions most widely used, the gears, are spread across all industries. For this reason, their importance has become overwhelming, which is why we want to recall in this paper some important aspects regarding toothed wheels. It is the geometry, cinematic, the forces and the yields of these mechanisms, which will be presented in the work in the form of newly synthesized relations on modern bases. Another important aspect in toothed wheels is their synthesis by modern methods that avoid tooth interference during operation. To avoid the interference between teeth, we must know the minimum number of teeth of the driving wheel, in function of the pressure angle (normal on the pitch circle, alpha0), in function of the tooth inclination angle (beta) and in function of the transmission ratio (i). In optimal and high-efficiency gearing, gears require a modern design with increased coverage. These achievements can only be achieved today in the context of lowering the value of the alpha engagement angle. Through all the aspects presented, which relate to the dynamics of gears, the work can be considered among those of the optimal dynamic synthesis of the gears.
6 citations
TL;DR: In this paper, an optical coherence tomography (OCT) method was proposed for measuring small-module gears with a small modulus of 0.2 mm, which has potential in the application of the measurement of micro gears.
Abstract: Due to the small size and harsh transmission conditions of small-module gears, it is very difficult to measure gear characteristics with a modulus smaller than 1 mm. We proposed an optical coherence tomography (OCT) method for measuring small-module gears. Testing of a 30-tooth copper gear with a small modulus of 0.5 mm was carried out for the measurement of its modulus, tooth parameter, tooth number, pressure angle, modification coefficient, and tooth thickness by using OCT. In addition, the influencing factors on the measurement were discussed. The whole teeth profile of a 0.2 mm modulus gear was imaged by processing of the data collected from different clamping angles. Compared with the visual imaging without depth information and small-scale microscopic imaging, the OCT method has shown its superiority, and it has potential in the application of the measurement of micro gears with a small modulus of less than 0.2 mm.
4 citations
Patent•
06 Nov 2018
TL;DR: In this article, a zoom lens zooming cam optimization method is proposed to solve the problems of low precision, low speed, and prone to get stuck in the zoom lens, and the method concretely comprises the steps of: 1, optical system design; 2, analysis of a cam pressure angle; 3, construction of a piecewise function for the whole cam according to a trend displayed by the camera pressure angle.
Abstract: The present invention belongs the field of photoelectronic imaging devices, and especially relates to a zoom lens zooming cam optimization method. The problems are solved that a zoom lens zooming camis not smooth, low in zooming precision, low in speed and prone to get stuck. The method concretely comprises the steps of: 1, optical system design; 2, analysis of a cam pressure angle; 3, construction of a piecewise function for the whole cam according to a trend displayed by the cam pressure angle; and 4, analysis of focal length output precision.
2 citations
Patent•
13 Mar 2018
TL;DR: In this paper, a system consisting of a hydraulic device, a hydraulic detecting device and a hydraulic controlling device was proposed to keep hydraulic pressure of a secondary pressure angle of a chamfering plate blank stable and a using method of the system.
Abstract: The invention relates to a system capable of keeping hydraulic pressure of a secondary pressure angle of a chamfering plate blank stable and a using method of the system. The system comprises a hydraulic device, a hydraulic detecting device and a hydraulic controlling device, wherein the hydraulic detecting device is used for detecting the oil pressure of the hydraulic cylinder lower cavity in thehydraulic device and timely transmits the oil pressure to the hydraulic controlling device; and when the oil pressure exceeds the normal range, a computer in the hydraulic detecting device controls arelated electromagnetic switching valve to switch over between a primary hydraulic pump and a standby hydraulic pump so as to ensure that the oil pressure of the hydraulic cylinder lower cavity in the hydraulic device is kept within the normal range and to ensure that a piston pushes a side pressing roller to carry out secondary angle pressing operation on the side part of the plate blank. With adoption of the system and the using method, the straight crack defect of the steel plate sides can be avoided, and the product quality is improved; and in addition, intelligent control over hydraulicequipment is realized to the maximum, so that the labor intensity of a site worker is greatly lowered and efficient production of a site is facilitated.
Patent•
07 Dec 2018
TL;DR: In this article, an aircraft slat tilt detection device consisting of an angular displacement sensor, a small tooth head associated with the angular displacements sensor, and a feedback rack for mounting to the internal groove of the slat rail is presented.
Abstract: The invention provides an aircraft slat tilt detection device which comprises: a slat tilt sensor device, an angular displacement sensor and a small tooth head associated with the angular displacementsensor; a feedback rack for mounting to the internal groove of the slat rail and engaging the small tooth head. A method for positioning the detection device is provided and includes the follow steps: determining a pressure angle between the feedback rack and the small tooth head; determining the number of teeth of small tooth head; determining the transmission ratio; calculating the number of teeth of the feedback rack according to the determined transmission ratio; selecting the modulus and calculating the center circle radius of the feedback rack and the small tooth head; arranging the small tooth head on the center circle and balancing the distance from other parts on the partition plate to prevent interference or small clearance, and adjusting the modulus to obtain the arranging position of the sensor small tooth head; adjusting the modulus to adjust the radius of the center circle, and ensuring the length of the rack can detect the angle of the full stroke of the slat. The invention can arrange the detection device capable of accurately detecting the slat tilt angle in the leading edge of an aircraft with tight space.
Patent•
07 Dec 2018
TL;DR: In this article, an aircraft slat tilt detection device is presented, which consists of an angular displacement sensor, a small tooth head associated with the sensor, and a feedback rack for mounting to an internal groove of the slat rail.
Abstract: The invention provides an aircraft slat tilt detection device, which comprises: a slat tilt sensor device, an angular displacement sensor and a small tooth head associated with the angular displacement sensor; a feedback rack for mounting to an internal groove of the slat rail and engaging the small tooth head. A method for positioning the detection device is improved and includes the follow steps: determining a pressure angle between the feedback rack and the small tooth head; determining the number of teeth of the small tooth head; determining the transmission ratio; calculating the number of teeth of the feedback rack according to the determined transmission ratio; selecting the modulus and calculating the center circle radius of the feedback rack and the small tooth head; arranging thesmall tooth head on the center circle and balancing the distance from other parts on the partition plate to prevent interference or small clearance, and adjusting the modulus to obtain the arrangingposition of the sensor small tooth head; adjusting the modulus to adjust the radius of the center circle, and ensuring that the length of the rack can detect the angle of the full stroke of the slat.The invention can arrange a detection device capable of accurately detecting the slat tilt angle in the leading edge of an aircraft with tight space.
01 Jul 2018
TL;DR: A six-degree-of-freedom (6-DOF) dynamic model of a helical gear system was constructed and the mechanism for generation of whine noise was analyzed, and the whine noise from the gearbox was eliminated.
Abstract: Gearbox whine noise can seriously reduce the interior sound quality in an electric passenger car. In this work, a six-degree-of-freedom (6-DOF) dynamic model of a helical gear system was constructed and the mechanism for generation of whine noise was analyzed. The root cause of the problem was found through noise, vibration and harshness (NVH) testing of the gearbox and the vehicle. A rigid-elastic coupling dynamics model of the reducer assembly was then developed. The accuracy of the model was then validated via modal testing. The structure-borne noise of the reducer under full acceleration conditions was predicted using the acoustic structure coupling model and the rigid-elastic coupling model of the reducer. Gear parameters including the pressure angle, the helix angle and the contact ratio were studied to determine their effects on the whine noise. Gear tooth microgeometry modification parameters were then optimized to reduce the transmission error of the first pair of meshing gears. Finally, the whine noise from the gearbox was eliminated.
Patent•
15 Jun 2018
TL;DR: In this article, the utility model relates to a pulley component part testing field, concretely relates to test device to pulley class set of component edge intensity, the on-line screen storage device comprises a base, the pressure balance board, fixing bolts, the sleeve, a pressure head guide holder, and the pressure head post.
Abstract: The utility model relates to a pulley component part testing field, concretely relates to test device to pulley class set of component edge intensity, the on -line screen storage device comprises a base, the pressure balance board, fixing bolts, the sleeve, the pressure head guide holder, the pressure head post, the one side at the base is installed to the pressure head guide holder, fixing bolt passes the sleeve and installs the opposite side at the base to the pressure balance board, the pressure head post is the cylinder at the convex pressure angle in a tip area, it has the slotted hole toopen on the pressure head guide holder, the pressure head post slides in the slotted hole of pressure head guide holder, the backing plate is arranged in on the base and is located the pulley class set of component's that is tested below, the central position of being tested with the quilt on the pressure balance board that corresponds of pulley class set of component is equipped with the pulleyclass set of component that fastening bolt fixed connection was tested. The utility model has the advantages of assurance test's stationarity and security reduce the damage to test device.
Patent•
19 Jan 2018
TL;DR: In this paper, the utility model discloses an inner gearing incomplete gear mechanism contains driven gear, drive gear, and driven gear is the ring form, a plurality of internal tooths of inner wall equipartition inhole, and drive gear establishes the gear mass, establishes the connecting hole in the gearmass, and the driving cog is established to the outer circumference of gear mass.
Abstract: The utility model discloses an inner gearing incomplete gear mechanism contains driven gear, drive gear, and driven gear is the ring form, a plurality of internal tooths of inner wall equipartition inhole, and drive gear establishes the gear mass, establishes the connecting hole in the gear mass, and the driving cog is established to the outer circumference of gear mass, the utility model discloses the driving cog is the same with the pressure angle of internal tooth, the driving cog size is less than the internal tooth, driving cog and driven gear's a second internal tooth inner gearing after the rotatory a week of drive gear, driving cog and driven gear's a third internal tooth inner gearing after the rotatory a week of drive gear continuation, the circulation intermittent driving who goes round and begins again, be fit for replacing the feeding connecting rod mechanism on the rice cake class food preparing appliance, it is big also to have solved feeding connecting rod mechanism frictional force, easy card pauses, the clearance is big, the problem that pay -off stroke error is big, also greatly reduced cost of maintenance.
Patent•
22 May 2018
TL;DR: In this article, a straight-toothed gear with the longitudinal overlap ratio (LOR) was introduced, where the end-to-end overlap ratio is equal to the sum of the end face overlap ratio and the LOR.
Abstract: The invention relates to a transmission device, in particular to a straight toothed gear with the longitudinal overlap ratio According to the form of the straight toothed gear, the straight toothed gear is divided into m rows of small straight toothed gear bodies identical to traditional straight toothed gears in module, pressure angle, addendum coefficient and tip clearance coefficient; the tooth widths of all the rows of the small straight toothed gear bodies are the same, and the groove widths of all the rows of the small straight toothed gear bodies are the same; every two teeth of the corresponding two adjacent rows are staggered sequentially by 1/n tooth pitch, wherein m and n are integers which are larger than 1, and m is larger than or equal to n; and standard mounting is adopted,so that the small straight toothed gear body of each row and the corresponding traditional straight toothed gear mounted in a standard mode have the same end face overlap ratio, the total overlap ratio is equal to the sum of the end face overlap ratio and the longitudinal overlap ratio, the longitudinal overlap ratio is equal to (m-1)/n, and the larger m is, the higher the overlap ratio is The straight toothed gear not having axial force but having the longitudinal overlap ratio is achieved, the defect that traditional bevel gears have unfavorable axial force, and the overlap ratio of the traditional straight toothed gears is relatively small are overcome, and transmission is more stable and more reliable
Patent•
16 Oct 2018
TL;DR: In this article, a double-arc harmonic tooth profile was proposed, which consists of external teeth of a flexible gear and internal teeth of an internal gear, where the external teeth are in an arc shape and the internal teeth are conjugate to the external features of the flexible gear.
Abstract: The invention discloses a novel double-arc harmonic tooth profile. The novel double-arc harmonic tooth profile comprises external teeth of a flexible gear and internal teeth of a steel gear, wherein the external teeth of the flexible gear mesh with the internal teeth of the steel gear; the tooth profile of the external teeth of the flexible gear is in an arc shape, and the tooth profile of the internal teeth of the steel gear is conjugate to the tooth profile of the external teeth of the flexible gear; the modulus of the external teeth of the flexible gear and the internal teeth of the steel gear is 0.2697, and the pressure angle of the external teeth of the flexible gear and the internal teeth of the steel gear is 21.75 degrees; and the number of teeth of the external teeth of the flexible gear is 160, and the number of teeth of the internal teeth of the steel gear is 162. According to the novel double-arc harmonic tooth profile, the double-arc tooth profile is different from a traditional involute tooth profile, the double-arc tooth profile replaces involute with an arc segment, and the modification operation is further carried out on tooth crests, so that the whole tooth profileis smoother and the bearing capacity of the teeth is higher.
TL;DR: In this paper, the authors investigated the influence of asymmetric involute teeth profiles for helical gears on the bending stress and concluded that the helical gear drive with asymmetric teeth profile having "loaded side pressure angle" of ( ) and "unloaded sidepressure angle" ( ) is better than a helical drive with standard teeth profile with pressure angle of ( ), from the regarding of tooth bending strength.
Abstract: This study investigates the influence of asymmetric involute teeth profiles for helical gears on the bending stress. Theoretically, bending stress has been estimated in spur involute gears which have symmetric teeth profile by based on the Lewis, 1892 equation. Later, this equation is developed by, Abdullah, 2012. to determine the effect of an asymmetric tooth profile for the spur gear on the bending stress. And then these equations are applied with stress concentration factor once for symmetric and once other for asymmetric teeth profile. In this paper, the bending stresses for various types of helical gear with various types of asymmetric teeth profile are calculated numerically for defined the stress concentration factor. The numerical solution based on the finite element method technique which that done by using the software simulation SolidWorks 2016. The results of this study indicate that the helical gear drive with asymmetric teeth profile having 'loaded side pressure angle' of ( ) and 'unloaded side pressure angle' of ( ) is better than a helical gear with standard teeth profile having pressure angle of ( ) from the regarding of tooth bending strength. Also, notes that the great enhancement in the results of maximum tooth bending stress for modified involute of tooth profile compared with the standard teeth profile. In addition to, predict the equation of stress concentration factor which is a function of both unloaded side pressure angle and helix angle and then it used with Abdullah equation for to determine the nominal stresses in the root fillet.
Patent•
27 Jul 2018
TL;DR: In this article, an adjusting and fixing device for a thermal protection material/structure and an arc wind tunnel testing device is presented, which comprises an adapter tooling which is fixedly connected with the front end of a base through an angle-of-attack adjusting block and a flow guide tooling between the test piece installation tooling and the middle front part of the base.
Abstract: The invention discloses an adjusting and fixing device for a thermal protection material/structure and an arc wind tunnel testing device. The adjusting and fixing device comprises an adapter tooling which is fixedly connected with the front end of a base through an angle of attack adjusting block and fixedly connected with a nozzle of a supersonic injector. The bottom surface of a test piece installation tooling is fixedly connected with the base. A flow guide tooling is fixedly connected between the test piece installation tooling and the middle front part of the base. A test piece is fixedlyconnected to the top surface of the front part of the test piece installation tooling. The top surface of the rear part of the test piece installation tooling is fixedly connected with an induced shock wave tooling. The radius of the leading edge, the sweep back angle and the side pressure angle of the induced shock wave tooling, the angle of attack of the test piece installation tooling, the size of the included angle of the angle of attack adjusting block and the gap size between the induced shock wave tooling and the test piece are used to realize the formation of the surface flow field state of the test piece during the test. The flow guide tooling is used for guiding the low-energy fluid of a boundary layer affected by the cooling of the nozzle. According to the invention, the simulation of a local high-state thermal environment by a small power wind tunnel can be achieved.
TL;DR: In this article, the effect of pressure angle and helix angle on bending stress at the root of helical gear tooth under dynamic state was studied and the photostress method has been used as experimental methods.
Abstract: Purpose
The aim of this paper is to study the effect of pressure angle and helix angle on bending stress at the root of helical gear tooth under dynamic state. Gear design is a highly complex process. The consistent demand to build low-cost, quieter and efficient machinery has resulted in a gradual change in gear design. Gear parameters such as pressure angle, helix angle, etc. affect the load-carrying capacity of gear teeth. Adequate load-carrying capacity of a gear is a prime requirement. The failure at the critical section because of bending stress is an unavoidable phenomenon. Besides this fact, the extent of these failures can be reduced by a proper gear design. The stresses produced under dynamic loading conditions in machine member differ considerably from those produced under static loading.
Design/methodology/approach
The present work is intended to study the effect of pressure angle and helix angle on the bending stress at the root of helical gear tooth under dynamic state. The photostress method has been used as experimental methods. Theoretical analysis was carried out by velocity factor method and Spott’s equation. LS DYNA has been used for finite element (FE) analysis.
Findings
The results show that experimental method gives a bending stress value that is closer to the true value, and bending stress varies with pressure angle and helix angle. The photostress technique gives clear knowledge of stress pattern at root of tooth.
Originality/value
The outcomes of this work help the designer use optimum weight-to-torque ratio of gear; this is ultimately going to reduce the total bulk of the gear box.
Patent•
15 Jun 2018
TL;DR: In this paper, the utility model provides a leather abrasion strength testing arrangement, comprising a base plate, the surperficial symmetry of bottom plate is fixed with first curb plate and second curb plate, and the first and second rear plate vertically backplates, the top surface of first curbplate is fixed by the bearing, the second surface of second curbplate by the motor relative with the bearing and the drive end of motor by the drive shaft.
Abstract: The utility model provides a leather abrasion strength testing arrangement, comprising a base plate, the surperficial symmetry of bottom plate is fixed with first curb plate and second curb plate andthe first and second curb plate vertically backplates, the top surface of first curb plate is fixed with the bearing, the top surface of second curb plate is fixed with the motor relative with the bearing, the drive end of motor is fixed with the drive shaft, the drive shaft with bearing interference fit, the interval is fixed with measure -alike first gear in the drive shaft, second gear and third gear, it is first, the below of second and third gear is equipped with the fourth gear of meshing in proper order, the 5th gear and the 6th gear, the fourth, the modulus of the 5th and the 6th gearand the pressure angle is the same with first gear and the number of teeth reduces in proper order, therefore make the corresponding number of times of scraping the needle reciprocating sliding of gear drive reduce in proper order in at one time, thereby the rub fastness of leather behind the realization test different frequency friction leather, high use efficiency and less dosage, and can adjustfixed leather according to the thickness of leather, it is very practical and reliable.
Patent•
23 Feb 2018
TL;DR: In this paper, a gear pitting method based on probability distribution is proposed to solve the internal excitation problem of a pitting gear system, which has the advantages that the defects are overcome that a traditional pitting model is greatly deviated from the actual and complex pitting distribution is unable to handle.
Abstract: A gear pitting modeling method based on probability distribution comprises: first, establishing a tooth face probability pitting plane distribution model, with pitting randomly distributed along toothwidth and normally distributed along tooth height; second, acquiring meshing line length variation by means of image processing; third, establishing one-to-one correspondence relation between the meshing line length variation and pressure angle; fourth, comprehensively considering hertz contact stiffness, bending stiffness, shear stiffness and axial compression stiffness to precisely calculate gear time-varying mesh stiffness and solve internal excitation of a gear system. The gear pitting modeling method based on probability distribution has the advantages that the defects are overcome that,for instance, a traditional pitting model is greatly deviated from the actual and complex pitting distribution is unable to be handled; model calculation precision is improved; internal excitation ofa pitting gear system is precisely calculated; gear pitting modeling based on probability distribution is completed.
Patent•
24 Aug 2018
TL;DR: In this paper, a parametric plunger movement law-based minimum base circle cam profile design method was proposed to rapidly obtain complete oil supply cams, which is capable of rapidly obtaining minimum cam base circle radii suitable for cam lift curves.
Abstract: The invention discloses a parametric plunger movement law-based minimum base circle cam profile design method. The method comprises the following steps of: calculating a pressure angle, a curvature radius and a contact stress of a cam according to a plunger movement lift curve, a pump-end fuel pressure characteristic curve, a roller diameter matched with the cam and a set base circle radius initial value; carrying out iterative calculation through gradually increasing the base circle radius until the pressure angle, the curvature radius and the contact stress satisfy design criteria of pressure angles, curvature radii and stress conditions, so as to obtain a minimum base circle radius satisfying a cam profile design criterion; and obtaining a finally determined cam profile according to a lift curve of a plunger movement process, the minimum base circle radius and the roller diameter matched with the cam. The method is capable of rapidly obtaining minimum cam base circle radii suitablefor cam lift curves, so as to rapidly obtain complete oil supply cams.
Patent•
26 Apr 2018
TL;DR: In this paper, a rotary arm restricts the rotation of a first sun gear or a second sun gear according to forward/reverse rotation drive of sheet discharge rollers, and the relationship of θ2A+0.5°≤θ 1A≤ θ 2A+1.5σ is satisfied.
Abstract: A rotary arm restricts the rotation of a first sun gear or a second sun gear according to forward/reverse rotation drive of sheet discharge rollers. As a result, a rotating direction of a transmission gear coupled to the sheet discharge rollers is switched. If θ1A denotes a pressure angle of gear teeth of a gear portion of the first sun gear and θ2A denotes a pressure angle of gear teeth of a first planetary gear, a relationship of θ2A+0.5°≤θ1A≤θ2A+1.5° is satisfied.
Patent•
26 Jan 2018
TL;DR: In this paper, the authors proposed a method to compensate for tooth surface distortion during worm wheel grinding of an axial modified helical gear with axial modification, which calculates the additional motion quantity of a grinding wheel during wormwheel dressing according to the warp quantum of a tooth surface.
Abstract: The invention relates to a tooth surface distortion compensation method during worm wheel grinding of an axial modified helical gear. The method solves the problem of tooth surface distortion when worm wheel grinding is conducted on a helical gear with axial modification, calculates the additional motion quantity of a grinding wheel during worm wheel dressing according to the warp quantum of a tooth surface on the basis of building a tooth surface warp quantum calculation model during worm wheel grinding of the axial modified helical gear, overlays additional motion on conventional worm wheeldressing motion to change a pressure angle of left and right tooth surfaces of the grinding wheel, and compensates tooth surface distortion by continuously changing the pressure angle in a width direction of the grinding wheel aiming at a continuous change trend of a profile pressure angle of a gear end section during tooth surface distortion, thereby improving the accuracy of worm wheel grindingof the axial modified helical gear.
Patent•
05 Jul 2018
TL;DR: In this article, a shaving cutter was proposed to perform shaving processing of a tooth surface of a processed gear in which a pressure angle of the first tooth surface on a front side of the tooth on which a force acts during rotation and a force acting during rotation on a back side of an asymmetric tooth are different from each other.
Abstract: PROBLEM TO BE SOLVED: To provide a shaving cutter, a method for processing a gear, and a gear processing device by which a gear of an asymmetric tooth form can be efficiently produced.SOLUTION: A shaving cutter which performs shaving processing of a tooth surface of a processed gear in which a pressure angle of a tooth surface on a front side of a tooth on which a force acts during rotation and a pressure angle on a back side of the tooth are different from each other. The shaving cutter is formed into a gear shape having plural teeth, each tooth of the shaving cutter has a first tooth surface which contacts a tooth surface on the front side of the tooth of the processed gear and a second tooth surface which contacts a tooth surface on the back side of the tooth of the processed gear, and a pressure angle of the first tooth surface and a pressure angle of the second tooth surface are different from each other.SELECTED DRAWING: Figure 6
Patent•
09 Mar 2018
TL;DR: In this paper, the utility model relates to a cardboard fillet cortex packaging machine, which uses the cardboard as base plate ( grey paperboard), the surface is through parcel cortex package decorations,implement the packaging machine structure that the cortex arc was sealed at its fillet end, packaging machine constructs the upper end and is equipped with the flat angle pillow unit that bridges of awater supply, two stocks do not are equipped with each other and lean on the pillow for 90 degrees abrupt ridge forms, divide the linea angulata to be a horizontally in the contained angle and
Abstract: The utility model relates to a cardboard fillet cortex packaging machine constructs. It uses the cardboard as base plate ( grey paperboard ), the surface is through parcel cortex package decorations,implement the packaging machine structure that the cortex arc was sealed at its fillet end, packaging machine constructs the upper end and is equipped with the flat angle pillow unit that bridges of awater supply, two stocks do not are equipped with each other and lean on the pillow for 90 degrees abrupt ridge forms, divide the linea angulata to be a horizontally in the contained angle and seal operation line, the pressure pin plate is comforted in one of a pressure angle push pedal and superpose, along sealing operation line toward covering the direction of pushing the angle face of stridingto, and pressure angle push pedal, it is recessed nock to comfort the terminal surface that bulldozes of pressing the pin plate, at least, press the nock camber of angle push pedal to be waiting circle camber. The utility model discloses a provide books such as hardcover, fairy tale book thick page or leaf front cover, or draw board, clipboard etc..
Patent•
12 Jun 2018
TL;DR: In this article, a measuring tool and a measuring method are described, which includes a first tooth pitch plate and an elongated first connecting portion, and an included angle between the first measuring portion and the second connecting portion is equal to twice the theoretical pressure angle of the to-be-tested rack.
Abstract: The invention discloses a measuring tool and a measuring method. The measuring tool includes a first tooth pitch plate and a second tooth pitch plate. The first tooth pitch plate includes a first measuring portion and an elongated first connecting portion. A bottom edge of the first measuring portion is configured to contact with a first tooth surface of a first tooth of a to-be-tested rack, and an included angle between the first measuring portion and the first connecting portion is equal to twice the theoretical pressure angle of the to-be-tested rack. The second tooth pitch plate includes asecond measuring portion and an elongated second connecting portion, the second measuring portion is arranged in parallel with the first measuring portion, a bottom edge of the second measuring portion is configured to be opposite to a first tooth surface of a second tooth of the to-be-tested rack, an included angle between the second measurement portion and the second connecting portion is equalto the theoretical pressure angle, and the first connecting portion and the second connecting portion are in movable connection along the length direction of the first connecting portion. With this measuring tool, the pressure angle deviation of the to-be-tested rack can be obtained.
Journal Article•
TL;DR: Gears are suffered by backlash the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles, undercut a condition in generated gear teeth when any part of the fillet curve lies inside of a line drawn tangent to the working profile at its lowest point and interference is an important aspect of kinematics of gearing.
Abstract: Gear is a machine element used to transmit motion and power between rotating shafts by means of progressive engagement of projections called teeth. Gears are classified according to the relative position of the axes of the shaft, type of gearing, peripheral velocity of the gears and position of teeth on gear surface. Presently gears are suffered by backlash the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles, undercut a condition in generated gear teeth when any part of the fillet curve lies inside of a line drawn tangent to the working profile at its lowest point and interference is an important aspect of kinematics of gearing. When the gear tooth tries to dig below the base circle of mating gear then the gear tooth action shall be non-conjugate and violate the fundamental law of gearing this non conjugate action is called the interference.
These defects can be eliminated by increasing the pressure angle, by increasing the addendum of mating gear and another way of increasing the load capacity of transmissions is to modify the involute geometry. This has been a standard practice in sophisticated gear design for many years; the nomenclature describing these types of gear modifications can be quite confusing with reference to addendum modification or profile shift. An additional alteration that is very rarely used is to make the gears asymmetric with different pressure angles for each side of the tooth
In this study, geometric design of asymmetric gear involute meshing is done. This method is appropriate for the geometric design of spur gears with a small teeth number and is based on the generalized model of involute meshing.