41 results about "Pressure angle" patented technology

The invention discloses a cam curve pressure angle optimization method of a continuous zooming infrared lens. The method comprises the following steps: S1, obtaining cam curve digital coordinate data of a to-be-optimized part; s2, pressure angle distribution characteristics are obtained; s3, selecting an optimization strategy according to the pressure angle distribution characteristics; s4, performing global piecewise function angle redistribution on the cam curve to be optimized; and S5, processing constraint inspection, motion constraint inspection, smoothness constraint inspection and pressure angle constraint inspection are performed according to the constraint conditions, and an optimized result is output after target requirements are met. According to the method, the cam curve can be accurately detected, and various parameters of the curve can be effectively optimized.

The application provides a design and calculation method of main parameters of helical gear flowmeter, and belongs to the technical field of flowmeter. The design and calculation method is obtained by theoretically analyzing the helical gear flowmeter, and the influence of the number of gears, modulus, pressure angle, helix angle, radial clearance of the flowmeter and end face clearance of the flowmeter on the flow pulsation, clearance flow leakage and power loss of the helical gear flowmeter is discussed. In combination with the particle swarm optimization algorithm, two of the three performance indexes, flow pulsation, leakage and power loss, are changed into constraint conditions according to the design requirements, so that the multi-objective problem is changed into a single-objective problem for solving the main parameters of the helical gear flowmeter. Compared with the traditional method of calculating the displacement of the flowmeter through the empirical formula and the empirical coefficient, the application can improve the displacement design precision of the flowmeter, can clearly determine the influence degree of each parameter on the performance of the flowmeter, and can quickly solve the main parameters of the helical gear flowmeter through the optimization algorithm.

The utility model discloses a kind of seat pitch adjusting device, including logging truck, the cab of logging truck is equipped with seat, and seat is installed in cab by bottom plate, the lower end of seat is equipped with buffer unit, and the lower end of buffer unit is equipped with top plate, adjusting mechanism is equipped between bottom plate and top plate, for adjusting seat pitch angle;The utility model is equipped with horizontal inclination sensor by setting the adjusting range of adjusting mechanism ±15 °, can read the inclination angle of logging truck, then control motor rotation adjusts and compensates the inclination angle of seat;While using circular arc guide rail slider as main structure, structure gap is small firm stable;Using the adjusting mode of cam groove and cam slider combination, motor and screw rod are used as power to push cam slider, while the cam structure with large pressure angle has self-locking ability, so that the adjusting mechanism has greater carrying capacity, while it can meet the demand of frequent adjustment.

The invention relates to a membrane disc flexible coupling, and relates to the field of couplings. According to the technical scheme, an inner and outer tooth meshing pair with matched modulus and pressure angle is additionally arranged on the membrane disc and the protective plate, so that an efficient emergency torque transmission structure is constructed; when the coupler works normally, meshing interference of inner teeth and outer teeth can be effectively avoided by means of the reserved transmission gap, and it is ensured that the flexible compensation performance of the membrane disc is not affected; once the membrane disc is damaged, the inner teeth and the outer teeth can be quickly meshed to form a temporary torque transmission path. Under the condition, the operation limitation of a traditional coupler is broken through, torque can be continuously transmitted after the diaphragm disc loses efficacy, precious emergency shutdown or maintenance time is won for equipment such as a large compressor and a generator set, production interruption and safety accidents caused by sudden shutdown of the generator set are fundamentally avoided, and the operation reliability of related equipment is remarkably improved.

The application discloses a kind of heavy load AGV wheel edge reduction unit asymmetric high coincidence planetary gear train optimization design method, it is related to artificial intelligence automatic driving field, including: the power, rotational speed and temperature parameter of wheel edge reduction unit operation are collected, dimensionless standardization processing is carried out based on benchmark working condition value, determines the working condition fluctuation interval corresponding to each parameter;Uniform sampling is carried out through the working condition fluctuation interval determined in step one, obtain several groups of working condition sample data, with the minimum gear face contact stress and root bending stress as optimization goal, solve the gear optimal design parameter corresponding to each group of working condition sample data;The application establishes the quantitative mapping relationship of working condition fluctuation and gear design parameter, so that modulus, pressure angle, tooth width and the like parameter can adapt to the change of load, rotational speed, temperature, improve the problem that optimal parameter is difficult to determine in traditional design relying on artificial experience iteration.

The invention provides a differential gear mechanism and a design method thereof. In the differential gear mechanism of the present disclosure, a reference pressure angle of each side gear tooth of a side gear and a reference pressure angle of each pinion tooth of a pinion gear increase from an intermediate portion of a tooth trace toward an inner end side and from the intermediate portion toward an outer end side, and the reference pressure angle of each side gear tooth of the side gear and the reference pressure angle of each pinion tooth of the pinion gear increase from the intermediate portion toward the outer end side. The tooth thickness of the pitch cone of the side gear decreases from the intermediate portion of the tooth trace toward the inner end side and increases from the intermediate portion toward the outer end side. The tooth thickness of the pitch cone of the pinion gear increases from the intermediate portion of the tooth trace toward the inner end side and decreases from the intermediate portion toward the outer end side.

The application discloses a gear design optimization method based on a Bayesian algorithm, and relates to the technical field of gear design. A tooth surface geometric model is established based on the pure rolling relationship of a rack and a gear, a load stiffness coupling model is constructed by combining meshing partition and a tooth direction slicing method, contact and bending stress are obtained, and drive and non-drive side pressure angles, addendum height coefficients, dedendum fillet radius coefficients, radial variables and tooth widths are taken as design parameters. A multi-objective function of minimizing maximum dedendum bending stress, maximum contact stress and maximizing average overlapping degree is set. A Markov blanket structure is introduced to screen key variables, a Gaussian process is used to establish a proxy model, and an improved acquisition function based on an expected hypervolume is used for iterative optimization. The number of iterations, the improvement amplitude and the running time limit are taken as termination conditions. The optimal parameters are screened by combining a normalized comprehensive score. The gear design optimization method based on the Bayesian algorithm can improve the design accuracy of asymmetric high-overlapping gears and the efficiency of design parameter optimization.

The invention discloses a method for calculating the cross-ball distance of asymmetric inner and outer back taper teeth. The method comprises the following steps of: 1, solving basic parameters of a workpiece, wherein the basic parameters comprise a base circle diameter, an original circle division end surface pressure angle and actual circle division helical angles on the left and right sides of an inclined back taper; 2, deducing the cross-ball distance at the position L of any cross section of the tooth pitch large end of the outer inclined back taper: solving the tooth thickness of the original large end face of the outer inclined back taper, the arc tooth thickness of the end face of any T cross section, the equivalent original normal arc tooth thickness of the T cross section, the equivalent original circle dividing normal displacement coefficient, the involute angle of the equivalent ball measuring center circle pressure angle of the T cross section and the ball measuring center circle pressure angle; and finally, calculating the cross-ball distance of the cross section of the odd and even teeth of the outer inclined inverted conical teeth at any distance L from the large end. According to the method, a solution is given, a calculation formula of the solution is deduced and the technical problem is solved by aiming at the difficulty of the cross-ball distance of the inner and outer inclined inverted conical teeth of the large gear ring, a theoretical calculation method of the cross-ball distance of the inverted conical teeth is perfected through three-dimensional modeling verification that the error is extremely small, and the method has guiding significance on field processing and detection of the inclined inverted conical teeth.

The present application provides a drive gear of a fishing reel. The drive gear (11) has a circular plate portion (30) and a plurality of gear teeth (31). The circular plate portion (30) has a rotational axis (X). The plurality of gear teeth (31) respectively protrude from a side surface on an outer peripheral side of the circular plate portion (30) in a direction extending toward the rotational axis (X). The gear teeth (31) have a main body portion (32) and an extension portion (33). A first angle (a11, a12) formed by a cylindrical surface (CP1) passing through a tooth top surface (31c) of the main body portion (32) and a radially inner side surface (31d) of the extension portion (33) is larger than an engagement pressure angle (b). Accordingly, the present application provides a drive gear of a fishing reel capable of improving a rotation feeling.

This utility model relates to the field of seismic testing equipment technology, and in particular to a testing device for the seismic performance of building structures. It includes a housing and a rebound hammer body. The housing is fixedly connected to the outer surface of the rebound hammer body. An adjustment mechanism is provided inside the housing. The adjustment mechanism includes a U-shaped plate, an adjustment cylinder, a buffer cylinder, a buffer plate, and a connecting rod. A U-shaped groove is formed on the side wall of the housing. The U-shaped plate is slidably connected to the inner side wall of the U-shaped groove. This utility model, through the cooperation of the U-shaped plate, housing, and suction cup, utilizes the adjustment cylinder and suction cup to apply pressure to the rebound hammer. First, the sealing plate is squeezed to firmly fix the suction cup to the U-shaped plate. Then, the housing and rebound hammer can only move perpendicularly towards the wall along the U-shaped plate, ensuring the accuracy of the pressure angle and avoiding errors caused by angle deviation, thus maintaining the accuracy of the test results.

This utility model discloses a plug compression testing device, relating to the technical field of testing devices, including a mounting plate and a compression assembly; the mounting plate has four corresponding legs fixed to its lower side, and a base plate fixed to the lower end of the four legs. A clamping assembly is installed in the middle of the mounting plate, and a fixing assembly and a rotating assembly are installed on the upper side of the clamping assembly. The left side of the rotating assembly is connected to the fixing assembly; the compression assembly includes a fixing strip, a first hydraulic rod, a connecting strip, a connecting plate, and a pressure sensor. A fixing hole is provided on the upper side of the mounting plate, and a fixing strip is fixed inside the fixing hole. Two corresponding first hydraulic rods are installed on the lower side of the fixing strip. A connecting strip is fixed on the telescopic arm of the first hydraulic rod, and a connecting plate is fixed between the two connecting strips. A groove is provided in the middle of the connecting plate, which can quickly adjust the pressure angle of the plug according to the requirements.

The application provides a plastic worm gear tooth thickness optimization design method, device, equipment and storage medium, and the method comprises the following steps: calculating geometric parameters according to the number of teeth, modulus, pressure angle and input torque of worm gear transmission; a first functional relationship between worm gear shearing stress and tooth thickness displacement coefficient is established; a second functional relationship between worm gear root bending stress and tooth thickness displacement coefficient is established through root dangerous section analysis; the optimal tooth thickness displacement coefficient is solved and the best tooth thickness is obtained by taking the minimum worm gear shearing stress as the target and the worm gear root bending stress not exceeding the allowable stress as the constraint. The plastic worm gear shearing stress model and the metal worm gear root bending stress model are established, and both are included in the unified optimization framework, the optimal design of the worm gear tooth thickness is realized under the premise of ensuring the strength of the worm gear, the limitation that the prior art only focuses on the strength of a single part is overcome, the blindness of the experience design is avoided, and the design efficiency and quality are improved.

The present application relates to a kind of heavy load industrial robot and gap adjustment calculation method.The gap adjustment calculation method of a kind of heavy load industrial robot described in the present application includes the following steps:S1: provide heavy load industrial robot;S2: obtain the meshing angle and pressure angle of input bevel gear;S3: calculate the normal force generated at the tooth surface width midpoint on the pitch cone surface of input bevel gear;S4: according to meshing angle, pressure angle and normal force, calculate the axial force generated on the tooth surface of input bevel gear;S5: calculate the first compression length of compression spring;S6: according to axial force and first compression length, select the compression spring with appropriate elastic coefficient k and original length, so that the first elastic force generated by compression spring is greater than or equal to the axial force of shaft tooth.The five-sixth axis structure and gap adjustment calculation method of a kind of heavy load industrial robot described in the present application have the advantages of simple debugging, convenient maintenance and high running stability.

The application discloses a kind of robust optimization design method of double pressure angle asymmetric gear modification parameters considering uncertain working condition, steps include: defining the torque value range of gear service condition uncertainty and geometric design requirement;Gear pair meshing performance simulation model is constructed and simulation test design is carried out;Establish the multi-objective optimization model of modification parameter with the target of comprehensive service performance index and comprehensive robustness index;Pareto solution set is obtained by using intelligent optimization algorithm;Select the best scheme and export gear three-dimensional model.The application will load spectrum fluctuation into asymmetric gear modification optimization, through the combination of proxy model and multi-objective optimization, realize the gear modification parameter design with strong robustness to uncertain working condition, significantly improve the transmission stability and reliability of gear under variable load condition, while greatly reduce the calculation cost and time in optimization design process.

This invention relates to an industrial robot and a method for calculating clearance adjustment. The method for calculating clearance adjustment of an industrial robot according to this invention includes the following steps: S1: providing an industrial robot; S2: obtaining the meshing angle γ, helix angle β, and pressure angle α of an input hyperboloid gear; S3: calculating the circumferential force F1 along the tangential direction on the tooth surface of the input hyperboloid gear; S4: calculating the axial force F generated on the bevel gear surface based on the meshing angle γ, helix angle β, pressure angle α, and circumferential force F1. a S5: Calculate the first compression length L1 of the compression spring; S6: Based on the axial force F a A compression spring with a suitable elastic coefficient k and an original length L0 is selected for the first compression length L1, so that the compression spring generates a first elastic force F. 弹1 Axial force F greater than or equal to the shaft tooth a The five- or six-axis module structure of an industrial robot and the calculation method for gap adjustment described in this invention have the advantages of simple debugging, convenient maintenance, and high operational stability.

The utility model discloses a motor five -axis rotary table with dustproof function, including bottom plate, the bottom plate top fixed mounting has rocking arm subassembly, rocking arm subassembly includes: two bearing seat, dustproof shield, fixed frame, dust screen, first motor, first helical gear, second helical gear and rotary table subassembly, by the dustproof shield, replaceable dust screen etc. Composed multilevel dustproof system is constructed, has guaranteed heat dissipation ventilation while effectively blocking dust invasion core transmission area, has improved the adaptability and durability of rotary table under the severe working condition significantly, it adopts helical gear meshing transmission (beta1 equals -beta2) and keeps gear pair modulus and pressure angle consistent, has guaranteed the high stability of transmission, low noise and long -term precision, in addition the design of replaceable dust screen makes routine maintenance very convenient, has reduced life cycle cost greatly.

The utility model relates to a deburring device which comprises a connecting assembly and a spline idler wheel, the connecting assembly is used for connecting the spline idler wheel to a lathe tool turret, and the spline idler wheel is configured to rotate around the axis of the spline idler wheel. A spline of the spline roller and a spline of a to-be-deburred part have the same modulus, and the spline tooth number of the spline roller and the spline tooth number of the part are relatively prime; the spline pressure angle of the spline roller is different from the spline pressure angle of the part; and a spline of the spline roller is provided with a helical angle. Through the arrangement of the spline roller, when the part spline needs to be deburred, the spline roller is close to the groove part of the part, the spline of the spline roller is meshed with the part spline, and along with rotation of the part, the spline of the spline roller and the part spline extrude each other, so that the burrs on the part spline can be flattened; and the deburring treatment on the spline of the part is realized. Meanwhile, manpower is saved, the probability of errors is smaller, and therefore damage to parts is reduced.

The invention provides a design method of a curve groove of a zoom cam lever and a zoom mechanism, and the method comprises the steps: obtaining data columns of the moving distances of a zoom lens group and a compensation lens group through optical software simulation, arranging the data columns, determining data and data serial numbers of a circle of rotation of the zoom cam lever, and calculating the curve groove of the zoom cam lever; and by adjusting the radius of the zoom cam lever or calculating the rotation angle of the corresponding point, it is ensured that all the pressure angles in the data column are not larger than the allowable pressure angle. According to the width of the curve groove and the minimum wall thickness of the curve groove, the minimum moving distance of one circle of curve winding is limited, so that the inner wall of the curve groove is smooth in the whole process and not prone to deformation, it is guaranteed that excellent imaging quality is obtained, smooth movement of the zoom guide pin can be guaranteed, a zoom mechanism is not prone to being blocked or even stuck, jumping of an optical axis is reduced, and the service life of the zoom mechanism is prolonged. And the driving torque of the motor for driving the zoom cam rod to rotate is reduced.

The present application relates to the technical field of transmission bearing in high temperature and high humidity environment and the technical field of red mud material hot reaction device, and particularly relates to a control bearing for high temperature and high humidity environment and a red mud hot reaction pressure material device. The control bearing for high temperature and high humidity environment comprises an outer ring, an inner ring, rolling bodies and a sealing sleeve. The inner ring is provided with a sliding key extending to the axis direction of the inner ring. The sealing sleeve comprises an outer sleeve ring and an inner sleeve ring. The inner sleeve ring is provided with a fixing hole with a diameter smaller than the minor diameter of the inner ring, and the inner side of the fixing hole is provided with a sealing key. The outer sleeve ring is provided with an outer sealing ring piece extending to the center line direction, and the inner sleeve ring is provided with an inner sealing ring piece extending to the direction away from the fixing hole. The rotating shaft can move relative to the control bearing in the axis direction, and the rotating shaft transmits the control action through the movement of the rotating shaft to adjust the pressure angle of the pressure material device.

The invention discloses a method for positioning and grinding an inner hole on a three-jaw chuck by using external teeth, which comprises the following steps of: calculating the diameter of a measuring bar according to the modulus and the pressure angle of a clamped gear, and then selecting the diameter of the measuring bar from the diameter approaching values of the measuring bars with national standard specifications; calculating the size of an M value of the gear detected by the measuring bar, and then converting the M value into the size of the outer diameter of the measuring bar; preparing a soft jaw to be installed on a three-jaw chuck, and turning the clamping inner diameter of the three-jaw chuck according to the outer diameter size value of the measuring bar; and the tooth blank of which the measuring bar is arranged in each tooth groove is arranged in the three-jaw chuck, so that the rapid correction of the tooth-shaped axis is completed. The method is simple and good in manufacturability and machining correction efficiency, has wide popularization and practical value, is applied to the rapid tooth profile correction method of the cylindrical gear subjected to carburizing and quenching, and is suitable for outer tooth positioning correction of the pitch circle of the gear and grinding or finish turning of the inner hole and the end face of the gear.

The utility model discloses an arc gear structure which comprises a gear with the gear modulus of mn, the working tooth profile of the gear is a section of arc, the pressure angle alpha at a node is 17.5 degrees or 18 degrees, the addendum height ha is (1-1.2) mn, the working tooth height h 'is (2-2.4) mn, the arc radius R of the tooth profile is (3.75-4.25) mn, the root fillet radius rg is 0.38 mn, the addendum fillet radius r is 0.1 mn, and mn is the normal modulus of the gear. The pressure angle alpha at the node is 17.5 degrees or 18 degrees, the overlap ratio of gear meshing can be increased by adopting the small pressure angle, and the bearing capacity of the gear is improved; besides, according to the arc gear, the working tooth height h 'is equal to (2-2.4) mn, and the working tooth height h' of a single arc gear in the prior art is equal to 1.2 mn, so that the tooth profile contact line of the gear teeth of the two gears is longer and more contact points are arranged on the gear teeth during meshing transmission, and the bearing capacity of the arc gear is further improved. And the tooth profile shape is simple, a machining tool is easy to manufacture, and the tooth profile shape and gear machining precision are easy to guarantee.

The application provides a process method for controlling head and tail transverse fold of strip steel, wherein the diameter of a reversing roller of a decoiler of a unit is designed as 154 mm, and the pressure, angle and wrap angle mode of the reversing roller of the decoiler are optimized and adjusted; meanwhile, a pinch roll straightener capable of providing tension is arranged in the unit during the decoiling and tail throwing processes. The process method solves the technical problem that the pickling and skin passing products of the extremely thin hot-rolled strip steel in the headless rolling are seriously cut due to the head and tail transverse fold defects, improves the product yield and enhances the product market competitiveness.

A spur gear of a gearbox of a gas turbine engine system of an aircraft includes a gear body, and a plurality of gear teeth extending radially outwardly from the gear body. A gear tooth of the plurality of gear teeth includes two opposing tooth sides extending to a tooth tip. The tooth tip defines a radially outboard extent of the gear tooth. A first tooth side of the opposing tooth sides has a first pressure angle, and a second tooth side of the opposing tooth sides has a second pressure angle different from the first pressure angle.

A novel machining process for a heavy-duty, high-precision reducer with low tooth difference is disclosed. The process includes: an eccentric shaft and two eccentric wheels integrally formed, with the eccentric phase of the two eccentric wheels being 180°; two separate internal gears, with backlash eliminated by adjusting the installation phase angle of the two internal gears; the teeth of the external and internal gears are double-circular-arc tooth profiles, with the pressure angle α of the double-circular-arc tooth profile ranging from 10° to 25°, the eccentric wheel deformation coefficient b ranging from 0.3 to 0.7, and the tooth addendum coefficient a ranging from 0.1 to 0.5; the bearing holes, pin shaft inner holes, and tooth portions of the two external gears are integrally machined. This machining process uses two separate internal gears, eliminates backlash by adjusting the installation phase angle, and simultaneously controls the pressure angle, eccentric wheel deformation coefficient, tooth addendum coefficient, and tooth dedendum coefficient to create internal and external gears with double-circular-arc tooth profiles. This results in a reducer with a large number of meshing teeth and a large meshing surface.

The application discloses a grinding wheel grinding head assembly, which comprises a box body, a main shaft and a grinding wheel arranged at one end of the main shaft, an installation cavity is arranged in the box body, a compensation mechanism is arranged in the installation cavity, the compensation mechanism comprises a lifting frame which can move vertically along the inner wall of the installation cavity, the main shaft is horizontally arranged in the installation cavity and penetrates through the lifting frame at both ends, a first oil cylinder body is arranged on the upper end surface of the lifting frame, a ratchet wheel is arranged in the first oil cylinder body, a piston rod is arranged on one side of the ratchet wheel, a ratchet wheel shifting rod is arranged on the piston rod, a driving gear is arranged on the rotating shaft of the ratchet wheel, a screw rod is arranged on one side of the driving gear, a driven gear which is engaged with the driving gear is arranged on the screw rod, and the lower end of the screw rod extends to the inside of the lifting frame and is connected with the lifting frame. The grinding wheel can feed along the direction of a workpiece, the feeding amount can be accurately fed, the grinding wheel can be automatically dressed, the compensation of the grinding wheel and the linkage operation of the pressure angle and the top dressing of the grinding wheel can be realized.

This invention relates to the field of gear reverse engineering technology, and more particularly to a gear design method and computer product based on reverse construction using composite tooth profile parameters. The gear design method based on reverse construction using composite tooth profile parameters of this invention, for the first time, constructs the centers of the addendum and root arcs as functions that dynamically shift with the displacement coefficient. At the microscopic level, the precise tangent points B and C between the involute and the addendum / root arcs are automatically searched to ensure a strictly smooth and interference-free tooth profile. At the macroscopic level, global optimization using the Jacobian matrix is ​​employed until the three strong constraints of equal addendum diameter, root diameter, and arc radius are satisfied, and the optimal module, displacement coefficient, and pressure angle are output. This allows for tooth profile generation simply by inputting the "addendum diameter, root diameter, and number of teeth." This process eliminates the need for repeated manual calculations, making it more direct, concise, and accurate, thus solving the technical problems of cumbersome operation and low accuracy of generated tooth profiles in existing reverse construction methods.

The present application provides a kind of vertical steering cam mechanism and profile curve generation method, belong to logistics automation technical field.For the problems of large pressure angle fluctuation, significant dynamic impact, design dependent experience and poor adaptability of high speed and high load of existing shuttle car vertical steering mechanism, the present application adopts kinematics reverse method, by constructing mathematical model, establishes global and cam motion coordinate system, sets rotation ratio n, guide rod length L and other parameters, analyzes cam-follower relative motion (coordinate translation and rotation transformation), generates cam groove track point cloud, calculates and controls pressure angle (peak value ≤45 °), completes optimization verification by combining three-dimensional modeling and dynamics simulation, realizes the accurate design of cam groove profile curve.The present application can make the shuttle car follower complete 90 ° steering stably, effectively inhibit the self-locking and dynamic impact of mechanism, shorten the design cycle, improve the operation reliability under high speed and high load working condition, meet the frequent vertical steering demand of automatic warehouse shuttle car.

To provide a gear manufacturing method that allows control of the gear pressure angle bias even when using a conventional gear grinding device. [Solution] The method for manufacturing a gear involves using a screw grinding wheel having a screw-shaped grinding section that is formed with a narrow pitch at one end and gradually widens towards the other end, and is formed with the same pressure angle from one end to the other end, and rotating the gear around the axis of the gear's central axis and the screw grinding wheel in the axial direction, while controlling the combined feed in the X-axis direction and the Z-axis direction to perform lead crowning on each tooth of the gear with the screw grinding wheel, and also controlling the feed direction and feed speed of the combined feed in the Y-axis direction and the Z-axis direction to perform grinding on each tooth of the gear with the screw grinding wheel in a way that changes the reference pitch circle diameter of the gear between one end and the other end along the tooth width direction of each tooth of the gear.

The power transmission mechanism (3) has a drive gear (10) fixed to the drive shaft (1) and a driven gear (20) fixed to the driven shaft (2) and meshing with the drive gear (10), and outputs power input to the drive shaft (1) to the driven shaft (2), in which a tooth group of the drive gear (10) and / or the driven gear (20) changes the torsion angle and / or the pressure angle of the teeth in the circumferential direction. A change in the torsion angle and / or pressure angle of the teeth in the circumferential direction is shaped, for example, to correspond to a waveform of a sine wave in the circumferential direction.

The invention provides an end face asymmetric tooth profile pure rolling gear mechanism for parallel shaft external meshing transmission and a tooth surface design method of the end face asymmetric tooth profile pure rolling gear mechanism, and relates to the technical field of asymmetric gear transmission. Comprising the steps that a small wheel and a large wheel are externally engaged in parallel with the axis, an engagement point moves at a constant speed along a set engagement line, and mutually pure rolling contact curves are formed on pitch circle cylindrical surfaces of the two wheels. The end face tooth profiles of the two wheels are asymmetrical left and right, and the working / non-working side pressure angles are different. The tooth surface is generated by spatial spiral motion of an end face tooth profile along a contact curve, and a continuously changing internal rotation angle is applied in the tooth width direction to form a crowned tooth surface and parabola-shaped no-load transmission error. The method comprises the steps of establishing a multi-coordinate system and an angular displacement function; constraining a corner relation; transforming the coordinates to obtain a contact curve; defining a middle section; the asymmetric tooth profile is in transition with the Hermite tooth root; generating a tooth surface along the curve; applying internal rotation angles layer by layer to realize a target error; and performing optimization and boundary treatment to obtain a robust tooth surface.