Showing papers on "Pressure angle published in 2015"
TL;DR: In this article, the authors adapted the standard ISO B methodology for estimating the tooth form factor and the stress correction factor in asymmetric spur gear tooth, and the critical root fillet parameters (critical root tooth thickness, bending moment arm and radius of curvature) were determined through an adapted ISO method and a comparative study with FEM.
22 citations
TL;DR: In this article, the influence of gear tooth geometrical variations in the performance of a double wave harmonic drive through statistical analysis is determined through state-of-the-art analytical and numerical models to evaluate kinematic error, load capacity, bending fatigue strength, and pitting.
Abstract: The objective of this research is to determine the influence of gear tooth geometrical variations in the performance of a double wave harmonic drive through statistical analysis This work incorporates state of the art analytical and numerical models to evaluate kinematic error, load capacity, bending fatigue strength, and pitting The geometric variables considered in this study include gear modulus, pressure angle, and tooth correction factor The statistical analysis follows a three-level full-factorial design of experiments Nonlinear dynamic simulation is accompanied by finite element analysis to estimate contact and bending stresses Largest bending fatigue strength is also determined Results demonstrate that gear modulus is the geometric parameter with prevalent influence on the kinematic error, and pitting life is rather high for all geometric variables considered
20 citations
TL;DR: A highly accurate dynamic contact angle algorithm is proposed and fully validated and within nearly the whole hydrophobicity range, it can decrease the dynamic contact angles error in the inclined plane method to less than a certain value even for different types of liquids.
Abstract: To improve the accuracy in the calculation of dynamic contact angle for drops on the inclined surface, a significant number of numerical drop profiles on the inclined surface with different inclination angles, drop volumes, and contact angles are generated based on the finite difference method, a least-squares ellipse-fitting algorithm is used to calculate the dynamic contact angle. The influences of the above three factors are systematically investigated. The results reveal that the dynamic contact angle errors, including the errors of the left and right contact angles, evaluated by the ellipse-fitting algorithm tend to increase with inclination angle/drop volume/contact angle. If the drop volume and the solid substrate are fixed, the errors of the left and right contact angles increase with inclination angle. After performing a tremendous amount of computation, the critical dimensionless drop volumes corresponding to the critical contact angle error are obtained. Based on the values of the critical volumes, a highly accurate dynamic contact angle algorithm is proposed and fully validated. Within nearly the whole hydrophobicity range, it can decrease the dynamic contact angle error in the inclined plane method to less than a certain value even for different types of liquids.
19 citations
TL;DR: Asymmetrical involute gears have a different value of the operating pressure angle for right and left side of the gear as mentioned in this paper, and they enable to change the length of the generating line.
Abstract: Asymmetrical involute gears have a different value of the operating pressure angle for right and left side of the gear. These teeth are suitable for one direction of rotation. Such teeth enable to change the length of the generating line. They enable to improve the value of reduced radii of curvature. Asymmetrical teeth allow reducing the values of Hertz's pressures, especially on the root of the teeth. Hertz pressures are directly related to the asymmetry.
19 citations
TL;DR: In this article, the authors presented an idea to remove the inequality in maximum fillet stresses developed between pinion and gear of a step up gear drive by using nonstandard basic racks of respective tooth thickness not equal to 0.5πm at the pitch circle.
Abstract: This article presents an idea to remove the inequality in maximum fillet stresses developed between pinion and gear of a step up gear drive. This uniform fillet strength of the gear drive can be achieved by using nonstandard pinion and gear with appropriate addendum modifications generated by nonstandard basic racks of respective tooth thickness not equal to 0.5πm at the pitch circle. The influence of gear parameters such as gear ratio, pressure angle, addendum factor, pinion teeth number, and addendum modifications on the maximum fillet stress on the nonstandard pinion and gears of different tooth thickness has been analyzed through finite element method and finally the optimum value of rack tooth thickness coefficients (k pc and k gc ) are suggested for the given gear drive (defined by i) that improves the fillet capacity in bending. This study has been extended for various drives like S std , S o , S +, and S − drives.
16 citations
Journal Article•
TL;DR: In this article, the influence of surface roughness on the characteristics of high pressure organ-pipe nozzle under high Reynolds numbers was investigated. And the relationship between turbulent boundary layer and roughness was theoretically analyzed, and the laws of the axial pressure fluctuation and the diffusion angle of the jet were investigated.
Abstract: The organ-pipe nozzle is widely used because of its generation of self-resonating cavitating jets which combines the advantages of cavitating jets and pulsed jets. In order to improve the working efficiency of organ-pipe nozzle by studying the influence of internal surface roughness on the characteristics of high pressure jet under high Reynolds numbers, the relations between turbulent boundary layer and surface roughness are theoretically analyzed, and the laws of the axial pressure fluctuation and the diffusion angle of the jet are investigated by experiment. The results show that, the peak pressure, the rage of pressure fluctuation and the diffusion angle are influenced more greatly by the surface roughness when the inlet pressure is greater. There exists a minimum roughness number, above which the diffusion angle starts to increase while the peak pressure and the rage of pressure fluctuation starts to decrease greatly. For a certain inlet pressure, there exists a critical roughness number, below which the axial pressure fluctuation increases at first and then decreases with the increase of stand-off distance, while above which the axis pressure fluctuation only decreases when the stand-off distance increases. Based on the experimental data, a preliminary mathematical model of the axial peak pressure relating to inlet pressure, internal surface roughness and stand-off distance was established by utilizing the principle of conservation of energy.
16 citations
TL;DR: In this paper, the authors present two approaches for reliable contact angle determination on inclining high-quality hydrophilic silicon wafers synthesized by straightforward silanization with 3-Aminopropyltriethoxysilane which can be used as coupling agent.
Abstract: The determination and evaluation of contact angles on solid surfaces is a widely used procedure in industry and scientific research. The reproducibility and comparability of contact angles measurements often suffers from the optical identification of the triple line movements, which is used to define the specific contact angles. Therefore, the analysis of contact angles using high-precision drop shape analysis is an approach to enhance the reproducibility of contact angle measurement, especially for inclined and otherwise non-axisymmetric droplets. In this contribution, we present two recently developed approaches for reliable contact angle determination on inclining high-quality hydrophilic silicon wafers synthesized by straightforward silanization with 3-Aminopropyltriethoxysilane which can be used as coupling agent. Thereby so-called ‘slow moving’ contact angle analyses were performed. On the one hand, the average curve shape of the contact angle relative to the inclination angle is investigated by a s...
15 citations
TL;DR: In this article, a double-crowning method was proposed by setting the hob's diagonal feed motion as a second-order function of hob's traverse movement and modifying the tooth profile of hob cutter into a dual-lead form with pressure angle changed in its longitudinal direction.
Abstract: To double-crown an involute helical gear, a hobbing method is proposed by setting the hob's diagonal feed motion as a second-order function of hob's traverse movement and modifying the tooth profile of hob cutter into a dual-lead form with pressure angle changed in its longitudinal direction. Merits of the proposed double-crowning method are also verified by using three computer simulation examples to illustrate and compare the topographies of tooth flanks, contact ellipses, and transmission errors under various assembly errors of the double-crowned gear pairs with those produced by using the conventional modified hob cutter and dual-lead hob cutter. Computer simulation results reveal the advantages of the proposed hobbing method for involute helical gear manufacturing.
15 citations
TL;DR: In this article, the shape function of the rotor with multiple profiles was derived, and performances (flow rate, irregularity, specific sliding and pressure angle), which were related to torque and noise, were calculated by a prediction algorithm of theoretical equations.
Abstract: The internal gear pump has been widely used in vehicles because of durability and downsizing, but torque and noise of rotor in the pump have been required to be improved for fuel efficiency. In this study, shape function of the rotor with multiple profiles (ellipse 1-involute-ellipse 2) was derived, and performances (flow rate, irregularity, specific sliding and pressure angle), which were related to torque and noise, were calculated by a prediction algorithm of theoretical equations. The optimal ranges of each design parameter were determined on the basis of analysis results of about 500,000 cases of rotor profiles by using the automated design and the multiple calculation programs developed. Based on the analysis results, the rotor profiles were suggested for improving fuel efficiency, and the performance tests for them were carried out for verifying the analysis.
13 citations
TL;DR: In this paper, a design method for the geometric shape and modification of asymmetric spur gear was proposed, in which the generator can be obtained directly according to the rack-cutter profile.
Abstract: A design method for the geometric shape and modification of asymmetric spur gear was proposed, in which the geometric shape and modification of the gear can be obtained directly according to the rack-cutter profile. In the geometric design process of the gear, a rack-cutter with different pressure angles and fillet radius in the driving side and coast side was selected, and the generated asymmetric spur gear profiles also had different pressure angles and fillets accordingly. In the modification design of the gear, the pressure angle modification of rack-cutter was conducted firstly and then the corresponding modified involute gear profile was obtained. The geometric model of spur gears was developed using computer-aided design, and the meshing process was analyzed using finite element simulation method. Furthermore, the transmission error and load sharing ratio of unmodified and modified asymmetric spur gears were investigated. Research results showed that the proposed gear design method was feasible and desired spur gear can be obtained through one time rapid machining by the method. Asymmetric spur gear with better transmission characteristic can be obtained via involute modification.
11 citations
TL;DR: Masuyama et al. as mentioned in this paper tried the design of a tooth profile that has a higher load capacity by analyzing the root stress by change of pressure angle and the bending fatigue strength of tooth paying attention to the torque capacity.
Abstract: In order to enhance the load capacity of gears, researchers take notice in the asymmetric tooth gears. Asymmetric gear which has higher pressure angle of back tooth aiming to improve banding strength has been analyzed (Deng, et al., 2003). Brown et al. (Brown, et al., 2010) investigate the asymmetric tooth from both point of view of bending and scuffing. Kruger et al. (Kruger et al., 2013) analysed root stress of asymmetric gear by the boundary element method. Recently in Japan Society of Mechanical Engineers, improvement of contact strength by higher pressure angle is paid attention (Morikawa, 2013). However, they have not mentioned to torque capacity for bending considering the single tooth contact. This paper attempts the design of a tooth profile that has a higher load capacity. The root stress by change of pressure angle is analysed by FEM. Furthermore, the bending fatigue strength of tooth paying attention to the torque capacity is investigated by a simulation method based on inclusion distribution (Masuyama, et al., 2013).
Journal Article•
TL;DR: In this paper, the influence of the center distance deviation and of the design parameters (i.e., cutter tip radius, dedendum, and tooth thickness) of the tooth profiles on interference was investigated.
Abstract: Gear design generally considers global geometry like tooth profile shape and centre distance, however, it needs also to consider the tolerances introduced in the manufacturing and assembly of two mating gears. The influence of these tolerances can be predicted better by understanding the behaviour of such manufacturing and assembly errors in conjunction with the gear geometry design process. To address this, in the present study the influence of the centre distance deviation and of the design parameters (i.e., cutter tip radius, dedendum, and tooth thickness) of the tooth profiles on interference will be investigated. An analytical modelling framework for interference of a gear pair is developed, which is used to characterise a structurally well-defined gear meshing system. Non-dimensionalisation methodology has been used to reduce the number of independent parameters and quantify the influence of the latter on interference risk. The tolerance zone is evaluated, with regard to cutter tip radius, dedendum, tooth thickness and centre distance deviation for a structurally well-defined gear mesh model. Different gear transmission ratio, contact ratio and a pressure angle of 20° have been considered. The results of the present work can be used as a guideline for the tolerance design of a gear pair.
Patent•
25 Mar 2015
TL;DR: In this paper, a design method of a high-order modified Pascal spiral curve non-circular gear pair is presented, where the concavity and convexity of a pitch curve are verified and the maximum modulus under the situation that undercutting is not carried out when a gear is machined through the gear shaping method is obtained.
Abstract: The invention discloses a design method of a high-order modified Pascal spiral curve non-circular gear pair. The study on a Pascal spiral curve gear is only limited within the situation of the periodic transmission ratio symmetric change, and the application range of the Pascal spiral curve gear can be expanded through the deep study on a high-order modified spiral curve gear and a non-circular gear conjugated with the high-order modified spiral curve gear. The design method specifically comprises the following steps that firstly, a pitch curve equation of the high-order modified Pascal spiral curve non-circular gear pair is established, and a center distance is calculated through the numerical method; secondly, the concavity and convexity of a pitch curve are verified, the maximum modulus under the situation that undercutting is not carried out when a gear is machined through the gear shaping method is obtained, the pressure angle change range is calculated, the maximum pressure angle value is verified, and the contact ratio when the high-order modified Pascal spiral curve non-circular gear pair is meshed is calculated. According to the design method, a whole set of thorough design theoretical basis is provided for the high-order modified Pascal spiral curve non-circular gear pair in actual application, and the using and popularizing of a high-order modified Pascal spiral curve non-circular gear are promoted.
01 Jan 2015
TL;DR: In this article, the static stresses of a symmetric type involute profiled spur gear pair at different pressure angles are compared using finite element analysis and validated using the conventional formulae for finding stresses in gear tooth.
Abstract: The principle objective of this paper is the comparison study of the static stresses for spur gear with different pressure angles. The analyzed results of a symmetric type involute profiled spur gear pair at different pressure angles are compared. Gears are one of the most important and crucial component in a mechanical power transmission unit and also in most of the industrial rotating machineries. Generally, a spur gear pair in action undergoes two types of stresses: the bending stress and the contact stress. In this paper, both these stresses on the gear tooth pair are analyzed using the finite element analysis and are compared. The stresses on the gear tooth are first analyzed using a finite element software and then those results are validated using the conventional formulae for finding stresses in gear tooth.
Patent•
25 Mar 2015
TL;DR: In this article, a gear rolling forming method for overcoming a tooth-form lug defect was proposed, in which at least one rolling wheel is used for rolling a blank, the modulus and pressure angle of the rolling wheels are the same as those of a forming gear, all the rolling wheel rotate in the same direction and perform radial feed along the blank, while the rolling horses roll the blank and gradually withdraws in the radial direction so as to make lugs round.
Abstract: The invention discloses a gear rolling forming method for overcoming a tooth-form lug defect. At least one rolling wheel is used for rolling a blank, the modulus and pressure angle of the rolling wheels are the same as those of a forming gear, all the rolling wheels rotate in the same direction and perform radial feed along the blank, while the rolling wheels roll the blank, a cylindrical wheel is used for rolling a gradually-formed tooth-form tooth crest of the blank and gradually withdraws in the radial direction so as to make lugs round through rolling along with radial stretching of the tooth-form tooth crest, the lugs are formed in rolling of the tooth-form tooth crest, and therefore the forming gear of which the tooth crest is relatively flat and free of the lugs or is with small lugs is obtained. According to the method, in the original rolling process, the cylindrical wheel is additionally arranged and used for synchronously flattening the lugs appearing on the tooth-form tooth crest through rolling, the process is simple and convenient and easy to implement, quality is good after forming, extra machining for cutting off the lugs is omitted or substantially reduced, material is saved, the production efficiency of forming the cylindrical gear through rolling is obviously improved, and the production cost is lowered.
Patent•
22 Apr 2015
TL;DR: In this article, a self-locking adjustable garden irrigation water nozzle is presented, where a worm gear is used for stepless-adjusting the displacement interval of a pull rod with a push rod piston so as to preset the dimension of the opening state of the water nozzle; a riveting hole of a locking button (10) is additionally provided with a concave-convex knurl (10b) for preventing disconnection; and the locking button(10a) was additionally added with a groove for holding by wet fingers.
Abstract: The invention discloses a throw-button self-locking stepless adjustable garden irrigation water nozzle A worm gear is used for stepless-adjusting the displacement interval of a pull rod with a pull rod piston so as to preset the dimension of the opening state of the water nozzle; a riveting hole of a locking button (10) is additionally provided with a concave-convex knurl (10b) for preventing disconnection; and the locking button (10) is additionally provided with a groove (10a) for holding by wet fingers About the problem of the nozzle body frost crack, the water preserved in the nozzle body is frozen to case the nozzle body frost crack after the water nozzle closes the water; the method of far-end water-stop is capable of completely solving the problem; and while the hand is loosened, the pull rod is restored, and a water-stop piston of the equiangular spiral or the logarithmic spiral which has equal pressure angle everywhere ensures the unlocking and drives a far-end water-stop sealing ring to be forwards moved so as to seal the water outside the nozzle A color plate (7) is provided with a plurality of triangle holes for multi-color The adaptive screw pitch, the lead angle and lead of an outer ring convex card of a feeding sealing ring are improved to prevent the distortion internal stress A locking button head part has the equal pressure angle everywhere
Patent•
10 Jun 2015
TL;DR: In this article, the authors proposed a teaching instrument with a rotatable cam fixed on a rack, a circular drawing board and a pressure angle indicator, wherein a roller is tightly clung on the outline of the cam; the roller is in threaded connection with a driven rod; a fine rod is arranged beside the driven rod in parallel; the driven rods can axially move relative to the fine rod through a plurality of lever sets.
Abstract: The invention relates to a teaching instrument with a cam mechanism. The teaching instrument comprises a rotatable cam fixed on a rack, a circular drawing board and a pressure angle indicator, wherein a roller is tightly clung on the outline of the cam; the roller is in threaded connection with a driven rod; a fine rod is arranged beside the driven rod in parallel; the driven rod can axially move relative to the fine rod through a plurality of lever sets. The teaching instrument with the cam mechanism adopts a modularized design, can realize replacing forms of the driven rod roller, a flat head and a tip head, indicating the pressure angle of the driven rod, drawing a displacement curve of three driven rods, changing the cam centering and offsetting position, drawing a cam curve through a reversal method, and indicating a stroke angle of the cam. The teaching instrument solves the defects that a teaching instrument with two large cam mechanisms is high in cost, large in size, large in weight and single in function, is relatively small in weight and size, convenient to carry, simple to manufacture, low in cost and suitable for large-area popularization.
Patent•
25 Mar 2015
TL;DR: In this paper, a design method of a high-order modified eccentric circular gear and a non-circular gear pair conjugated with the high order modified eccentric circle gear is presented.
Abstract: The invention discloses a design method of a high-order modified eccentric circular gear and a non-circular gear pair conjugated with the high-order modified circular gear. There is no literature report on design and application research on a high-order modified eccentric circle-non-circular gear pair so far. The design method specifically comprises the following steps that firstly, a pitch curve equation of a high-order modified eccentric circle gear and a non-circular gear pair conjugated with the high-order modified eccentric circle gear is established, and a center distance is calculated through the numerical method; secondly, the concavity and convexity of a pitch curve are verified, the maximum modulus under the situation that undercutting is not carried out when a gear is machined through the gear shaping method is obtained, the pressure angle change range is calculated, the maximum pressure angle value is verified, and the contact ratio when the high-order modified eccentric circle gear and the non-circular gear pair conjugated with the high-order modified eccentric circle gear are meshed is calculated. According to the design method, a whole set of thorough design theoretical basis is provided for the high-order modified eccentric circle gear and the non-circular gear pair conjugated with the high-order modified eccentric circle gear in actual application, and the using and popularizing of the high-order modified eccentric circle gear and the non-circular gear pair conjugated with the high-order modified eccentric circle gear are promoted.
Patent•
25 Mar 2015
TL;DR: In this article, a design method of a high-order modified Fourier non-circular gear pair is presented, where the concavity and convexity of a pitch curve are verified, the pressure angle change range is calculated, the maximum pressure angle value is verified, and the maximum modulus under the situation that undercutting is not carried out when a gear is machined through the gear shaping method is obtained.
Abstract: The invention discloses a design method of a high-order modified Fourier non-circular gear pair. The shape of a pitch curve of a Fourier pitch curve non-circular gear is easy to adjust, the pitch curve is widely applied in many fields, but the study on the Fourier pitch curve non-circular gear is only limited within the situation of the periodic transmission ratio symmetric change, and there is no design method systematically comprising all Fourier pitch curve non-circular gear pairs. The design method specifically comprises the following steps that firstly, a pitch curve equation of the high-order modified Fourier curve non-circular gear pair is established, and a center distance is calculated through the numerical method; secondly, the concavity and convexity of a pitch curve are verified, the pressure angle change range is calculated, the maximum pressure angle value is verified, the maximum modulus under the situation that undercutting is not carried out when a gear is machined through the gear shaping method is obtained, and the contact ratio when the high-order modified Fourier curve non-circular gear pair is meshed is calculated. According to the design method, a whole set of thorough design theoretical basis is provided for the high-order modified Fourier non-circular gear pair in actual application, and the using and popularizing of a high-order modified Fourier non-circular gear are promoted.
Patent•
09 Dec 2015
TL;DR: In this paper, a lithium electric chain saw for controlling brake and stop of a brushless motor through an equiangular spiral cam is presented, where a front security baffle is used to prevent chain falling and realize safety braking and stop.
Abstract: Provided is a lithium electric chain saw for electrically controlling brake and stop of a brushless motor through an equiangular spiral cam. How to prevent chain falling and realize safety brake and stop is a long-standing, big and difficult problem, while innovation is made in the invention. When an accident happens, because of the inertia of the machine and people, the arm of an operator involuntarily pushes a front security baffle to rotate forward, a lateral pushing curve (11-1) of a logarithmic spiral with the characteristic of equal pressure angle at all positions on a front baffle brake shaft (11) acts, a curved brake head (11-7) having a brake-stop control lever (11-6) and a brake-stop cam of the logarithmic spiral with the characteristic of equal pressure angle at all positions carry out braking and stopping, and therefore, damage caused by the accident is avoided. An output shaft (26) is sleeved with a brake-stop cam with a strong close-wound return spring in a position close to a big chain saw gear. A chain wheel spring (30) and an escape-proof chain wheel (36) are additionally installed. One end of the steel wire ring of the additional chain wheel spring (30) is smoothed, and an unsmoothed steel wire head at the other end contacts and grab-hooks the side of the escape-proof chain wheel. The steel wire head can axially repel the escape-proof chain wheel, and therefore, the escape-proof chain wheel can axially repel the chain to prevent escape. Electromagnetic brake and stop of a brushless motor is quicker. Damage caused by accidents is avoided.
Patent•
26 Aug 2015
TL;DR: In this article, a drive system with a polar radius and a polar angle was proposed, in which a left cover, a right cover and an input shaft are arranged at two ends of a casing, where the left cover and the right cover are supported by the left end hole of an output shaft.
Abstract: The invention relates to a drive system adopting a polar radius and a polar angle. The drive system comprises a left cover, a right cover, an input shaft, a locating ring eccentric sleeve, a locating ring, a Geneva wheel eccentric sleeve, a Geneva wheel, a roller, a transfer pin, a cross plate, a groove ring and unloading rings, wherein the left cover and the right cover are arranged at two ends of a casing; the input shaft are supported in the left cover and the left end hole of an output shaft; the locating ring eccentric sleeve and the locating ring are on the input shaft; the transfer pin and the cross plate are mounted on the Geneva wheel and a transfer pin fixing plate; the groove ring and the unloading rings are in the casing. The movement of the input shaft is delivered to the output shaft via the Geneva wheel and the transfer pin; the roller keeps tangent to the groove wall of the Geneva wheel, the locating ring and a tooth-shaped curve of the groove ring; the tooth-shaped curve of the groove ring is an envelope curve of the moving roller; high-contact-ratio meshing can be realized; the unloading rings are used for unloading force acting on the Geneva wheel; the cross plate converts translation and rotation overlaid on the Geneva wheel into circular motion of the output shaft; the eccentric distance of the locating ring eccentric sleeve is increased, so that the tooth-shaped pressure angle of the groove ring can be reduced, and the force, acting on the locating ring, of the roller can be reduced. The invention further discloses a method for determining the groove curve of the groove ring in the drive system adopting the polar radius and the polar angle.
01 Jan 2015
TL;DR: In this article, the authors focused on analysis of bending stress as well as contact ratio in altered tooth-sum gears using load sharing diagram and showed the loading pattern and contact length for both standard and altered toothsum gears at different points of contact.
Abstract: Power transmission between shafts that need positive drive is well assured by gears. The size and shape of the gear tooth is a critical consideration if specific drive requirements are imposed. Thus, design of gears calls for a detailed study of the tooth geometry that defines the performances like load carrying capacity, wear characteristics, efficiency and noise. Among them load carrying capacity is one of the fundamental requirements which depends on bending strength that can be computed using well known Lewis equation. Most often, tooth geometry is modified using S-gearing to influence the performance that may be either So or S+ type. Tooth geometry can also be modified by way of altering the tooth-sum of meshing gears for a standard center distance and module. Such modifications have some inherent benefits that are unique. Hence, this study is focused on analysis of bending stress as well as contact ratio in altered toothsum gears using load sharing diagram. The diagram clearly shows the loading pattern and contact length for both standard and altered tooth-sum gears at different points of contact. The load sharing analysis is carried out for altered tooth-sum spur gears having tooth-sum 100, 2 mm module, face width 10 mm and 20 o pressure angle with a tangential load of 9.81N/mm of face
Patent•
16 Dec 2015
TL;DR: In this paper, the utility model relates to a pressure frame machine with press angle subassembly, including four cylinders, and the carriage is equipped with the lever seat on the mount, the pin joint of lever seat is in the middle part of a lever, the lever afterbody is controlled by a pressure angle cylinder, the afterbody pin joint is fixed in in one cylinder block on the glide plane.
Abstract: The utility model relates to a pressure frame machine with press angle subassembly, press the angle subassembly including four, press the angle subassembly to include the carriage, the carriage includes the glide plane, locates immediately the mount angle stiffening platform anterior with locating the mount on the glide plane, be equipped with the lever seat on the mount, the pin joint of lever seat is in the middle part of a lever, the lever afterbody is controlled by a pressure angle cylinder, pressure angle cylinder afterbody pin joint is fixed in in one cylinder block on the glide plane, the one end of a lever head pin joint centering block, a centering block other end pin joint briquetting. The utility model discloses middling pressure angle subassembly adopts a succession of pin -jointed structure, and synchronous translation can be distinguished with the concatenation of the short frame of long frame to messenger's dress frame in -process briquetting, has avoided the briquetting rotation, briquetting and the surperficial problems of product such as the indentation that concatenation district's point contact or line contact arouse is sunken.
Patent•
05 Feb 2015
TL;DR: In this article, a bearing assembly for a gearbox for supporting a gear wheel on a gear-box shaft is described, which consists of a two-row asymmetric tapered roller bearing in O arrangement.
Abstract: The invention relates to a bearing assembly for a gearbox for supporting a gear wheel (1) on a gearbox shaft (2), comprising a two-row asymmetric tapered roller bearing (4) in O arrangement, which has a first row of tapered rollers (4a), which is adjacent to the shaft end (3), and a second row of tapered rollers (4b), which is adjacent to the first row of tapered rollers (4a), wherein the two rows of tapered rollers (4a, 4b) are arranged between a common outer ring (5) arranged on the gear wheel (1) and a respective inner ring (6a, 6b) arranged on the gearbox shaft (2), wherein a first acute pressure angle (7a) on the first row of tapered rollers (4a) is not equal to a second acute pressure angle (7b) on the second row of tapered rollers (4b). According to the invention, the first pressure angle (7a) is at least 3 degrees less than the second pressure angle (7b).
Patent•
09 Sep 2015
TL;DR: In this article, the axial tooth profile of the asymmetrical hob is designed by the steps of firstly, setting the basic parameters of a to-be-machined gear as die number m, tooth number z, pressure angle alpha n and modification coefficient x.
Abstract: The invention discloses an asymmetrical hob and a design method thereof. The asymmetrical hob is characterized in that the axial tooth profile of the asymmetrical hob comprises a left tooth profile and a right tooth profile, the left tooth profile comprises linear segments HI, IJ and KL and an arc-shaped segment JK, and the right tooth profile comprises linear segments PO, ON and ML and an arc-shaped segment NM. The axial tooth profile of the asymmetrical hob is designed by the steps of firstly, setting the basic parameters of a to-be-machined gear as die number m, tooth number z, pressure angle alpha n and modification coefficient x, setting the diameter of the involute starting point of the left tooth profile QSG of the to-be-machined gear as dFf1, and setting the diameter of the involute starting point of the right tooth profile UTG of the to-be-machined gear as dFf2; secondly, determining the tooth profile parameters according to the following formula, and the like. The asymmetrical hob has the advantages that the left tooth profile and the right tooth profile of the to-be-machined gear can have different involute starting point diameters and tooth root curves, machining of idle gears and planet gears participating in bidirectional meshing is facilitated, and the strength and the reliability of the idle gears and the planet gears are increased.
TL;DR: In this paper, the tooth deformation of spur gears is not constant for all examined teeth of gears, and the deformation depends on the shape of the teeth, on the basic parameters of examined spur gear, such as the number of teeth, module gearing, pressure angle, gearing width, correction and modification of gearing.
Abstract: Gear teeth are deformed due to the load. The tooth deformation of spur gears is not constant for all examined teeth of gears. Tooth deformation is depends on the shape of the teeth, on the basic parameters of examined spur gear, such as the number of teeth, module gearing, pressure angle, gearing width, correction and modification of gearing.
Patent•
28 Oct 2015
TL;DR: The utility model as discussed by the authors discloses an automatic equipment of panel light frame, including workstation 1, be equipped with interior angle fixing devices, exterior angle fixing device, a plurality of pressure angle device on the workstation and drive a pluralityof seats platforms cylinder 2 of a molding device back-and-forth movements.
Abstract: The utility model discloses an automatic equipment of panel light frame, including workstation 1, be equipped with interior angle fixing device, exterior angle fixing device, a plurality of pressure angle device on the workstation and drive a plurality of seats platforms cylinder 2 of a plurality of moulding device back -and -forth movements The beneficial effects of the utility model are that, structural design is reasonable, and degree of automation is high
Patent•
25 Mar 2015
TL;DR: In this article, an improved undercutting machining method for an extra-large-pressure-angle transmission gear is described. But the method is not suitable for the transmission gear design.
Abstract: The invention belongs to a machining technology for a gear, and relates to an improved undercutting machining method for an extra-large-pressure-angle transmission gear. The undercutting machining method is characterized by including the following steps that rough gear hobbing is performed; a tooth root undercutting circle is machined. According to the improved undercutting machining method for the extra-large-pressure-angle transmission gear, designing, manufacturing and machining periods of a tool are greatly shortened, machining efficiency is improved, and the machining cost is lowered.
Patent•
21 Oct 2015
TL;DR: In this paper, a cylindrical gear parameter accurate reversing method was proposed, in which a control inductor probe moves to a certain gullet of a cylinrical gear along a Y axis, then a revolving axle is controlled to be linked to an X axis, and the inductor probes are enabled to move relative to the tooth profile of the cylinear gear until the inductors are disengaged from the cylined gear under the condition that contact with the tooth profiles is maintained, and tooth profile position information measured by the probe is acquired in the movement process.
Abstract: The invention provides a cylindrical gear parameter accurate reversing method. A control inductor probe moves to a certain gullet of a cylindrical gear along a Y axis, then a revolving axle is controlled to be linked to an X axis, the inductor probe is enabled to move relative to the tooth profile of the cylindrical gear until the inductor probe is disengaged from the cylindrical gear under the condition that contact with the tooth profile is maintained, and tooth profile position information measured by the inductor probe is acquired in the movement process; and the tooth profile position information is substituted into an involute parameter expression of the gear tooth profile, an actual basic circle radius value of the cylindrical gear is solved, and then the modulus and the pressure angle of the cylindrical gear are solved by use of a pattern search mode. According to the invention, various parameters of the gear are determined through detection of the gear, the method can be used for replacement of a failure gear, and also through reversing of the gear parameters, errors of actual processing parameters of the gear can be determined.
Patent•
27 Aug 2015
TL;DR: In this paper, an assembly formed by a frame to which the pressure angle is fixed, said pressure angle comprising two steel profiles that are joined at a minimum distance by means of welding points.
Abstract: In order to achieve an adjustment of greater than 65 millimetres and improve the installation of the product, the invention relates to an assembly formed by a frame to which the pressure angle is fixed, said pressure angle comprising two steel profiles that are joined at a minimum distance by means of welding points. The internal profile is L-shaped and the external profile is similar to the first having an end fold, this pressure angle suitably guiding, housing and securing the wall clamp by exerting pressure on same, such that the assembly is adapted to a wall of variable thickness and creates a space for positioning different insulating materials. The invention also relates to an embodiment wherein the frame and a part of the pressure angle form a single element that is joined to the second part of the pressure angle by screws, thereby supporting the wall clamp in a similar manner to the first embodiment.