Showing papers on "Pressure angle published in 2010"

Maximum Fillet Stress Analysis Based on Load Sharing in Normal Contact Ratio Spur Gear Drives

Abstract: An optimum design of high-quality gears requires an accurate estimation of the tooth load. Since only a fraction of the total load is shared by each pair, when there is contact in more than one pair during transmission, the same has been estimated with a reasonable accuracy through the load-sharing ratio calculated using the single-point loaded model. The reliability of this method has also been justified by comparison with multipair contact models and also by checking with the values available in the literature. The influence of finite-element modeling, boundary conditions, gear ratio, teeth number, module, pressure angle at pitch circle, backup ratio, generating rack cutter tip radius, and addendum modification factor on the load-sharing ratio and in turn in the maximum fillet stress has been studied and discussed using single-point loaded model of normal contact ratio gear pairs in this study.

Method and tool for manufacturing face gears

Abstract: A cutter disk having cutting blades oriented on its circumference with the cutting edges of the blades oriented perpendicular to the axis of rotation of the cutter disk thereby representing a plane which can be oriented to a work piece (e.g. face gear) under an angle equal to the pressure angle of the mating face gear set's pinion, and, which can be rotated around a virtual pinion axis to generate a tooth flank on the work piece.

A kinematic investigation of a spherical involute bevel-geared system

Abstract: This study gives an exact definition of the spherical involute curved face and the pitch azimuthal angle of a bevel-geared system. Using the coordinate-transformation method, it derives the kinematic relations between the operating pressure angles, pitch azimuthal angles, operating pitch cone angles, base cone angles, and pitch action angles. An exact spherical involute bevel gear illustrates that a spherical involute tooth profile can be modelled only if the operating pressure angle, operating pitch cone angle, number of teeth, and cone radius are given. The ratio of the angular speeds of the spherical involute bevel gear reveals that the comparison of a bevel gear with a cone friction wheel is similar to the situation in which a belt that is wound around a base cone becomes untied and is wound around the base cone of the other party. The findings confirm that even when the shaft angle changes, the ratio of angular speeds does not change. This study also exactly calculates the operating rate in a...

Method and tool for manufaturing face gears

Abstract: A cutter disk having cutting blades oriented on its circumference with the cutting edges of the blades oriented perpendicular to the axis of rotation of the cutter disk thereby representing a plane which can be oriented to a work piece (e.g. face gear) under an angle equal to the pressure angle of the mating face gear set's pinion, and, which can be rotated around a virtual pinion axis to generate a tooth flank on the work piece.

The Ideal Geometry Parameters of Arch Cylindrical Gear and Its Process Method

Abstract: This paper put forward ideal geometry parameters of arch cylindrical gear based on analyzing the geometry parameters and process methods of similar arch cylindrical gears.It analyzed the mesh characteristics of two tooth surfaces of gear pair.By graphical representation of the tooth-surface equation and the mesh line expression,it demonstrated the mesh state of two teeth surfaces with graph,which can verify the feasibility of the gear's geometry parameters.It can be concluded that the radius of concave surface and convex surface of the tooth must be equal in the gear,the tooth thickness is equal to the slot width on the different radial section of the gear teeth and the pressure angle at the reference circle must be equal.Based on it,the processing method of the involute arch cylindrical gear and the parallel rod gear processing device,were put forward.

Noise reduction of a high-speed printing system using optimized gears based on Taguchi's method

Abstract: To meet the increasing demand for more quiet printers, a noise reduction method is required for high-speed laser beam printing. The driving-gear noise is one of the most important components influencing the noise level in laser beam printers. In this paper, optimized gear designs based on Taguchi’s method are presented. The proposed optimized gears are applied to a high-speed laser beam printer. The design parameters for the plastic gear are selected during optimization as follows: a pressure angle of 20°, a helix angle of 20°, a module of 0.5, and a profile coefficient of 1.4/0.2/1.2 (cutter addendum × module / cutter tip radius × module / cutter dedendum × module). Through the Taguchi method, the prominence ratio and loudness in the sense of human hearing range, as well as the sound pressure level (SPL) are also reduced in the present printing system.

Pre-grind hob for machining hard tooth surface gear

Abstract: The utility model relates to a pre-grind hob for machining hard tooth surface gear, the pressure angle of the hob is 20 DEG, the hob tooth root transition circular angle R is 0.3 modulus, characterized in that, the tooth curve of the hob tooth top is of elliptical shape, wherein, the tooth-shaped bottom cross section of the tooth top is an elliptical long axis, the distance from the long axis center to the tooth top end is a short semi-axis, the length of the short semi-axis is 0.65 times of that of the long semi-axis. The utility model has advantages that the tooth curve of the hob tooth top adopts the elliptical shape, can satisfy the technical requirements of grind-remaining allowance and tooth root cut amount and can effectively improve the bending stress problem of the grinded tooth root, and the tooth grinding time can be shortened and the machining efficiency can be improved.

Internal gear machining method and internal gear machining device

Abstract: An internal gear machining method and an internal gear machining device, are provided for grinding of a tooth profile of an internal gear using a barrel-shaped threaded grinding wheel. An NC device functions as a tooth profile error correction means and reduces a measured pressure angle error of a workpiece at a tooth face by correcting the radial position, the lateral position of the grinding wheel, the turning angle of the grinding wheel, and the helical motion; reduces a measured error in the direction of a tooth trace of the workpiece at a tooth face by correcting the helical motion; and reduces a measured tooth thickness error of the workpiece at a tooth face by correcting the radial position, the lateral position of the grinding wheel, and the helical motion.

Wind-power generating yaw speed reducer

Abstract: The invention relates to a yaw speed reducer of a wind power generator. Four-stage satellite transmission structures are arranged in a box and are connected with each other to be transmitted to an output gear shaft in sequence; a motor flange is connected to the upper end of the box; the output gear shaft is arranged in a support body through an upper bearing and a lower bearing and is sealed by an oil seal base; a first-stage internal gear ring is connected into the motor flange through bolts; a motor input connection sleeve is arranged in the motor flange through a bearing; the number of theinternal teeth of the motor input connection sleeve is the same as the number of the external teeth of a first-stage sun gear; and the internal teeth of the motor input connection sleeve and the external teeth of the first-stage sun gear have the same modulus and the same pressure angle of 20 degrees and are in mutual meshing transmission. The yaw speed reducer has compact structure, reasonable design, good uniform-loading effect, strong bearing and impact resistance capacity, good sealing performance and a uniformly-forced satellite gear meshed with the floating sun gear, is convenient to make and not easy to cause the environmental pollution and runs stably, thereby meeting the requirements of the clients.

Ball bearing and corresponding bump stop

Abstract: A bearing for an angularly contacting bump stop, the washers of which consist of stamped sheet metal and have a surrounding geometry. The geometry of the bearing is such that, in every cutaway containing the geometrical axis of rotation of the bearing, the lower raceway forms a lower circle arc which defines a lower axial curvature center, the upper raceway forms an upper circle arc which defines an upper axial curvature center, the upper and lower curvature centers being located on an angular geometrical axis that forms with the geometrical axis of rotation an angle of obliquity of a value between 5° and 65°. Specifically, the lower circle arc has two ends defining an opening angle of a value greater than or equal to 80° and a tangent located in a lower plane perpendicular to the axis of rotation at a lower tangent point defining with the end of the nearest lower circle arc a portion of the lower circle arc having an opening angle greater than or equal to 10°.

Profile Surface Construction and Pressure Angle Analysis of a New Type of Globoidal Indexing Cam

Abstract: This paper presents a new type of globoidal indexing cam mechanism with steel ball. The characteristic of this mechanism has double circular arc section for cam raceway. Due to this kind of cam raceway section the mechanism can realize approximate rolling transmission. According to rotary transform tensor theory profile surface equation of globoidal cam is established. Meshing equation is built through meshing theory, and profile surface equation is determined by meshing equation. Based on profile surface equation 3D geometric model for globoidal cam is established. MATLAB software is used to calculate three-dimensional coordinate points, these coordinate points are imported into Pro/E software, and finally 3D model for globoidal cam is established by three-dimensional modeling function of Pro/E software. Pressure angle equation of globoidal cam is also established. On the condition that the other parameters remain unchanged the variation law of values of pressure angle depended on cam angle and indexing plate rotary radius is obtained respectively.

Thermal deformation of helical gears

Abstract: The analytical equation for the thermal field of a helical gear under normal working condition in a stable thermal field is established using mathematical physics, and the thermal deformation of the gear can be computed using this equation. The variations of gear geometric parameters, such as radial dimension, tooth depth, spiral angle, pressure angle, flank clearance and etc., are investigated with respect to the temperature change. According to the analytical and computational results obtained using the equation, the thermal deformation of the gear is strongly dependent on the choice of parameters, which is also confirmed using simulation software (COMSOL Multiphysic software). This is significant for the improvement of the rotation precision and working efficiency of screw gears.

Gear pair consisting of a crown gear and of a pinion gear, and differential compensation transmission device

Abstract: The present invention relates to a gear pair consisting of a crown gear (1) and of a pinion gear (2) provided in the form of a spur gear with an axis crossing angle of 90 DEG . According to the invention, the teeth (3) of the pinion gear (2), in order to reduce an undercut of the teeth (5) of the crown gear (1), have a pressure angle, which increases from the outside inward in a radial direction with regard to the crown gear (1), or in the event of a constant pressure angle, have a profile offset, which decreases from the outside inward in a radial direction with regard to the crown gear (1).

Pressure Angle of Toroidal Drive with Cylindrical Teeth

Abstract: The meshing equation of the toroidal drive with cylindrical tooth is established by using space meshing theory,and the calculation formulas of pressure angle of the planet worm gear and the toroidal internal gear are also given,and the major influencing factors are analyzed and forecasted. The project is carried out by adopting the orthogonal experiment table including four row influencing factors and three column influencing factors,the influencing factors and the changing law of the mechanism pressure angle are obtained. The pressure angles of the planet worm gear and the toroidal internal gear are changed by the planet worm gear rotation. The pressure angle of the planet worm gear is sensitive to its radius and the pressure angle of the toroidal internal gear is sensitive to transmission ratio,and they both are least influenced by the radius of roller. The maximum value of the pressure angle is obtained at the middle point of the meshing process. The ideal pressure angle and maximum efficiency of toroidal drive are achieved by adopting reasonable parameters. The presented results provide the theoretical basis for the design and manufacture of toroidal drive.

Building the Pressure Angle Expression of the Cams with Negative Radius Roller Follower

Abstract: Putting forward new concepts forward-travel and back-travel,the difference of rise-travel and forward-travel(back-travel and return travel) was clarified.Six kinds of cams with negative-radius roller translation or oscillating follower were received.The expression of pressure angle of these cam mechanisms were obtained by virtual displacement method.These works will be helpful to the analysis and synthesis of these can mechanisms by pressure angle later.

Efficiency of the High Contact Ratio Involute Spur Gears With Asymmetric Teeth

Abstract: Gears with asymmetric teeth have unique potential for application in gearboxes, particularly when uni-directional loading is applied. Most recently, gears with asymmetric teeth have received much attention for use in applications that require high performance due to increased load capacity. Such applications include aircraft and wind turbine. These gears offer flexibility to designers due to their non-standard design. In asymmetric teeth, the geometry of the drive side is not to be symmetric to the coast side. In other words, the pressure angle on the drive side is greater or smaller than that on the coast side. Asymmetry between tooth sides provide vital in obtaining key properties, such as high load carrying capacity, low weight, low wear or low vibration. In order to effectively design asymmetric teeth, it is necessary to perform analyses on the efficiency of these gears under various loading. In this study, the results obtained on high contact ratio involute spur gears with asymmetric teeth are presented and discussed. The impact of a few design parameters, such as pressure angle or tooth height, on sliding velocities and friction is investigated and illustrated with numerical examples.Copyright © 2010 by ASME

Driving axle with high speed reducing ratio

Abstract: A driving axle of a loader has a high total speed reducing ratio of 26:1, wherein the speed reducing ratio of a main speed reduction driving device is 528:1, and the speed reducing ratio of a wheel edge speed reduction driving device is 494:1 The main speed reduction driving device with the speed reducing ratio of 528:1 comprises a driving gear set comprising a driving spiral bevel gear (2-1) and a driven spiral bevel gear (2-2) The gear ratio of the driven spiral bevel gear to the driving spiral bevel gear is 37:7, and the driving spiral bevel gear and the driven spiral bevel gear both have a modulus of 111, pressure angle of 225 degrees, spiral angle of 35 degrees and conical distance of 20899 mm The mounting distances of the driving spiral bevel gear and the driven spiral bevel gear are 762 mm and 216 mm respectively The wheel edge speed reduction driving device with the speed reducing ratio of 494:1 is a four-planet NGW type planet speed reduction driving device and comprises a driving gear set mainly comprising a fixed annular gear (3-1), a driven planetary wheel (3-2) and a driving sun wheel (3-3) The gear ratio of the sun wheel to the planetary wheel to the annular gear is 17:24:67, the displacement coefficients of the sun wheel, the planetary wheel and the annular gear are 05, 05308 and 04326 respectively, and the modulus thereof are all 5

The Auxiliary Angle Method for Deriving the Pressure-Angle Expressions of Cam Mechanisms

Abstract: Starting from the planar and spatial mesh fundamental theorem, this paper puts forward a new, general and effective method for deriving the pressure-angle expressions of cam mechanisms—“Auxiliary Angle Method”. It successively overcomes the shortcomings and defects of traditional Velocity Instantaneous-pole Method’s, and is very suitable for all planar and spatial cam mechanisms. New method lay the foundations for the solution of cam mechanisms’ fundamental size tasks.

High-pressure circulating ball power steering gear

Abstract: The utility model relates to a high-pressure circulating ball power steering gear, belonging to the technical field of automotive power steering gear. The power steering gear comprises a steering rocker shaft, a side cover component, a steering nut, a valve component and a casing component, wherein the steering rocker shaft is installed on the output end of an oil cylinder casing, the steering nut is installed on a steering screw, the end portion of the steering screw is connected with an input shaft, and a safety valve is installed on the valve component. The pressure angle of a gear section on the steering rocker shaft is 27 degrees five minutes, the gear sector can bear torsion load below pressure of 20 MPa, thereby improving the integral strength of the steering rocker shaft. One end of a bearing is fixed with the oil cylinder on one end, and the other end of the bearing is positioned by an elastic gasket for hole which can be conveniently assembled, thereby guaranteeing the positioning stability of the bearing in the cylinder, and preventing the bearing from axially displacing in the cylinder. The high-pressure circulating ball power steering gear solves the problems of faults of the steering gear, such as clamping, heaviness and the like as the steering gear is located in limit position, and the steering screw has insufficient rigidity. And the service life of the steering gear is effectively protected.

An Principle and Technology of On-Machine Measurement for Large Gear Hopping

Abstract: For large gear with the characteristic of large structure, quality and modulus, its profile precision is usually measured by in-site measurement. Based on large gear on-machine measuring described, involute helicoid and its characteristic are studied. The definition of medium rack in the framework of gear meshing transmission is put forward, the scheme of on-machine measurement based on rack-shaped-edge probe is formed, which can be divided into rolled angle (phase angle) and pressure angle (meshing angle) measurement according to the rotation of gear and prob. Measurement grid is determined by measuring straight generatrix deviation of gear profile, furthermore total tooth profile deviation and total helix deviation are separated.

Fuzzy Optimization Design Method on Fine-Pitch Tooth Profile

Abstract: In view of the characteristics of the low-noise and high-strength of auto gears, this paper proposes a new method of optimization of fine-pitch tooth profile. Based on the constant gear-pair parameter values of transmission ratio, modulus, pressure angle, the method takes the optimal contact ratio as design object, sets up the constraint conditions such as noise limit index, non-interference, non-undercutting, and non-sharpened in the tip, and optimizes the addendum coefficient and coefficient so as to increase the contact ratio. In addition, this paper makes a finite element strength analysis on the design result, and the result shows that the new method can not only reduces noise but also improves gear strength of fine-pitch gear.

Coupling element in a motor vehicle gearbox

Abstract: A coupling element, for example a coupling sleeve (1), having coupling teeth (2) which, over a part (2a) of their length, have a gradually diminishing cross-sectional profile, a so-called back rake. Over the part, the coupling teeth have a portion (7b) nearest the tooth root having a first pressure angle, which portion connects to a portion (7b) extending to the tooth tip and having a greater pressure angle than the former portion.

Internal gear-shaped diamond dresser having clearance, truing of grindstone for gear machining, dressing method, and grinding method of internal gear

Abstract: PROBLEM TO BE SOLVED: To provide an internal gear-shaped diamond dresser capable of truing and dressing highly accurately and highly efficiently a grindstone for use in highly accurately grinding an internal gear which has been tempered. SOLUTION: The internal gear-shaped diamond dresser being designed by the almost same specification as that of the internal gear of a workpiece, having a tooth shape at an inner diameter part of a ring shaped metal substrate, and having a clearance at both ends of the tooth shape in a tooth width direction is used. The clearance is set by chamfering or providing a step. Preferably, module, pressure angle, torsion angle, tooth thickness and the like which are main specifications of the gear are each made to be the same as those of the workpiece. A tooth width and a tooth depth are designed to be larger than those of the workpiece to ensure meshing with the grindstone. The number of teeth is increased and decreased according to the specification of the diamond dresser. COPYRIGHT: (C)2010,JPO&INPIT

Multi-objective optimization of the non-symmetrical gear agglutinate strength based on elastohydrodynamic lubrication theory

Abstract: To improve the design quality of the non-symmetric double pressure angle gear and shorten the design cycle time,in accordance with elastohydrodynamic lubrication theory,by example,the authors took the maximum value of the smallest film thickness between gear teeth and the minimum value of the total volume of the transmission gears as the object function.And,constrained multi-objective optimization was achieved according to particle swarm optimization,programming with MATLAB.On this basis,study from the point of mathematical logic and physical mechanism were carried out for the sensitivity analysis of objective function to each design variable according to gear engagement theory and principles of modern tribology.The results show that with module and width of gear increasing,the volume of the meshing non-symmetrical gears increases,and it is more sensitive to module comparing with width of gears,the film minimum thickness increases as each of module,width of gear,pressure angle and modification coefficient increases.Pressure angle,module,width of gear and modification coefficient are in order of the degree of sensitivity.Especially,pressure angle is the most important factor for the elastohydrodynamic lubrication film minimum thickness between gear teeth.The increase of the pressure angle on the working profile significantly causes rising of smallest film thickness.Coefficients of all the meshing gears,no matter big or small,have equal influence on the film minimum thickness.

Influence of Angle and Height on Cavitation of Triangle-notch Orifice

Abstract: In order to research the influence of angle and height on cavitation,the pressure field was simulated using FLUENT for the triangle-notch throttle at orifice angle 8° and 2°,opening 2mm and 004mmSimulation results show that when reducing angle and height,the pressure drop which produces a negative pressure lower than air separation pressure in flow field increases,it makes cavitation difficult to happen,even at high pressure dropThe results can provide reference to design anti-cavitation damping orifice or groove of hydraulic pump floating sideboard or valve plate at high pressure drop