74 results about "Gear (shape)" patented technology

The invention discloses a repair technique of a main transmission gear of an oxygen making air compressor, comprising the following technique steps: 1) the residual service life of a damaged main transmission gear to be repaired is evaluated; 2) a 40CrMo series steel bolts with high strength are embedded at the positions where the local gears are broken; 3) the original design dimension and shape of the main transmission gear are manufactured or repaired by a laser directional light prototype; 4) the gear surface and the gear shape are repaired by a contour machining, thus reaching the technical requirement of original design tolerance and geometric tolerance of the gear surface. The invention has the advantages and effective effects that the damaged main transmission gear is fully repaired by the technique method and the oxygen making air compressor gear of the invention; furthermore, the performance of the repaired main transmission gear reaches the original design technical requirement, the wearability and stress corrosion resistance are improved, and the rotation in the application operation is ensured stable and reliable; meanwhile, the service life index of the repaired main transmission gear complies with or exceeds the original design requirement.

The invention belongs to the gear shaping field and relates to an improved gear shaping method by using a Y54 gear shaper. The tooth thickness of the reference circle of a used gear shaper cutter is less than the tooth-space width of the reference circle of a processed part; the gear shaping method comprises the steps of: computing the tooth number of a distribution change gear; carrying out the first gear processing; solving the tooth thickness difference Delta S of the reference circle of the processed part; computing the number Zb of the shift gears; rotating a second gear pair driven gear of the distribution change gear for Zb teeth to ensure that the processed part rotates along the reference circle for the tooth thickness difference Delta S; and carrying out the second gear processing. The invention can guarantee the processing quality without manufacturing a special gear shaper cutter, shortens the processing period, reduces the processing cost and improves the passing rate of the processing.

The invention discloses a gear broaching process for a thin-wall internal spline shaft, and relates to the technical field of internal spline shaft machining. The gear broaching process specifically comprises the following steps that S1, firstly, a round steel material is selected for blanking, and the round steel material is cut into the size required by an internal spline shaft through cutting equipment according to the required workpiece size to form a workblank; and S2, rough turning is carried out on the workpiece, the cut workblank is polished through polishing equipment, after polishingis completed, the workpiece is clamped through a clamp, then rough machining is carried out on an inner hole, an outer circle and the length of the workpiece through a horizontal lathe, so that the workpiece is made to be close to the final shape and size, and 0.4mm - 1mm machining allowance is correspondingly reserved for the inner hole, the outer circle and the length of the workpiece after rough turning. According to the gear broaching process for the thin-wall internal spline shaft, the gear broaching process is adopted to replace a gear shaping process to machine an internal spline, theproduct machining precision is improved, the product quality is stabler, the product damage rate is reduced, the economic loss is reduced, and the loss of a cutter is small.

The invention discloses a combined gear ring manufacturing method of a hybrid new energy vehicle transmission. Discharge equipment is used for discharging; a scale on the surface of a blank is removed; the blank is heated to 950-1050 DEG C; the forging is performed on an electric spiral press after heating; the final forging is performed on the electric spiral press at a temperature of not lower than 900 DEG C; the hot trimming is performed; the mechanical drilling is performed; the isothermal annealing is performed; the shot blasting is performed to remove the scale; the sorting is performed to actuate the surface phosphorus saponification for a qualified product; and a gear sharp angle of a product combined gear is coldly extruded, meanwhile, six arc holes are punched, and the six arc holes are once molded by punching. The combined gear ring manufacturing method finishes the extrusion molding of the gear sharp angle of the combined gear and precise punching of six arc holes in one procedure, can guarantee the gear shape precision of the combined gear and the position precision of six arc holes, greatly improves the gear shape precision and the size precision, is high in production efficiency, improves the material utilization rate highly, reduces the process difficulty of the transmission combined gear ring, and reduces the machining cost.

The invention relates to the technical field of processing of transmission sleeves in gear transmission systems and discloses a manufacturing method of a transmission sleeve with two involute tooth-shaped internal splines. The manufacturing method mainly comprises the following steps of sawing; cold-extruding of a large hole; cold-extruding of a small step hole; first time rough turning; cold-extruding of a large tooth-shaped internal spline; second time rough turning; cold-extruding of a small tooth-shaped internal spline; numerically controlled finish turning; and cylindrical grinding. The manufacturing method specifically comprises the following steps of carrying out sawing, softening treatment and surface lubricating treatment on a hot rolled round steel bar; carrying out cold-extruding of the large hole, cold-extruding of the small step hole, cold-extruding of the large internal spline and cold-extruding of the small internal spline in a cold-extruding die on a hydraulic press; and then carrying out follow-up finish turning, thermal treatment and grinding to obtain a qualified transmission sleeve part. Compared with a conventional manufacturing method of turning+gear shaping processing+gear broaching, the manufacturing method of the transmission sleeve manufactures a tooth-shaped blank of the transmission sleeve by adopting a cold-extruding forming method and has the advantages of being high in utilization ratio of materials, high in production efficiency, low in manufacturing cost and the like.

The invention discloses a machining process of a large welding gear. The machining process specifically comprises the following steps of 1, preliminary machining of a gear blank; 2, preliminary heat treatment of the blank; 3, preliminary machining of the gear shape; 4, turning machining of the gear shape; 5, welding of all parts of the gear; 6, gear shaving and hobbing finish machining of the gear; and 7, secondary heat treatment of the gear. The invention relates to the technical field of gears. According to the machining process of the large welding gear, through the arrangement of the step5, the welding part is preheated and subjected to heat preservation when the gear is welded, after preheating, the overall performance of the gear is more active than that of a normal temperature state, welding spots can be completely heated and fused during welding, the optimal welding state is achieved, carbon dioxide is adopted for welding protection during welding, the welding spots are effectively prevented from being oxidized by air, the reliability of the welding spots during welding is further improved, and the percent of pass of welded products is improved.

The invention provides a strong-impact-resistant back shock absorber, which comprises a shell, a center shaft, damping parts and a bearing joint, wherein the upper end and the lower end of the shell are each provided with a round shock absorption cavity for containing the damping parts; the damping parts are arranged in the shock absorption cavities; the two ends of the center shaft extend into the shock absorption cavities to be connected with the damping parts, and the bearing joint is connected to the center shaft and can slide along the center shaft and rotate around the center shaft; each of the damping parts comprises a quick release part, a metal elastic part, an end cover, a friction plate and a conical spring, wherein the quick release part is installed at the end of the center shaft, the metal elastic part is in a gear shape, a gap exists between the metal elastic part and the inner walls of the shock absorption cavities; the end cover is connected to the ends of the shock absorption cavities; the friction plate is hidden in the end cover and makes surface contact with the quick release part; and the conical spring is connected between the end cover and the friction plate in an abutting mode. The gear-shaped metal elastic part is adopted as elastic limiting to cause rigidity gradual change, and the impact amplification phenomenon of a traditional shock absorber is improved.

A manual plate cutting machine, comprises a workbench, a handle and a cutter, a front support and a rear support mounted on the workbench at intervals, wherein one end of the handle is in a gear shape, which is an active sector gear, coupled with the front support; the cutter comprises a cutter holder and a cutter body, the cutter body is mounted below the cutter holder, and one end of the cutter holder is in a gear shape, which is a passive sector gear, engaged with the active sector gear, and the other end of the cutter holder is coupled with the rear support. The present application optimizes the structure of a manual plate cutting machine. Compared with the traditional machine with reset spring structure, when cutting the plate, it is not required to overcome the elastic force of the reset spring, making it easy to cut.

A gear cutting machine for gear cutting a workpiece (W) using a gear shaped cutter (17), by engaging and rotating the workpiece (W) that can rotate around a workpiece axis and a gear shaped cutter (17) that can rotate around a cutter axis, while cutting and feeding the gear shaped cutter (17), including:rough cutting at a cross axis angle to the cutter axis, then moving the cutter axis by moving a predetermined angle around the workpiece axis, and performing finish cutting such that the cutter axis has an angle with regard to the workpiece axis in a plane that includes the feeding axis direction and the cutting direction after moving.

The invention discloses a cold finishing production line for gears of multiple specifications. The cold finishing production line comprises a rotary table, a first cold finishing unit, a second cold finishing unit and a third cold finishing unit, wherein the rotary table is a circular rotary table, the first cold finishing unit, the second cold finishing unit and the third cold finishing unit workindependently from one another, the first cold finishing unit, the second cold finishing unit and the third cold finishing unit each comprise a gear shape detection assembly, a gear feeding assemblyand a gear cold finishing assembly, one ends of the gear shape detection assemblies are connected with the rotary table, the gear feeding assemblies are connected with the outer circumference of the rotary table, and the gear feeding assemblies can transfer the gears to the gear cold finishing assemblies. According to the cold finishing production line, screening and cold finishing of the gears ofvarious specifications and sizes can be performed, the first cold finishing unit, the second cold finishing unit and the third cold finishing unit which work independently are arranged, so that the working efficiency is improved, and each working unit can perform gear shape detection, gear transferring and gear cold finishing.

The gear dedendum bending fatigue durability testing device disclosed in the present invention includes a strain gauge attached to the tooth root of the gear to be tested and a pressing piece adapted to the shape of the gear to be tested. The pressing piece is pressed into the tooth groove of the gear to be tested. A silicone rubber pad is arranged between the pressure piece and the gear to be tested; a patch template fitted on the tooth surface of the gear to be tested is also included; the strain gauge is connected to the slip ring through a lead wire, and the slip ring is connected to a strain gauge through a wire. The testing method disclosed by the present invention includes seven steps of determining the maximum stress point area, making a patch template, making a pressing piece, sticking and protecting the strain gauge, calculating the sampling frequency, durability testing and data processing. The test method can accurately carry out the fatigue durability data of gear products, and provide a basis for the design and use of gear transmission devices; Convenient and accurate test results.

The invention relates to a high-flux characterization method for wear resistance of a composite material, and belongs to the field of powder metallurgy. The method comprises the following steps: firstly, uniformly dividing a cylindrical mold into a plurality of parts by adopting detachable separation sheets, respectively putting composite blanks with the same matrix and different contents or different types of strengthening phases into each equal part of the mold, compacting, and drawing out the separation sheets; then preparing the composite blank into a circular ring with a certain thicknessby adopting powder metallurgy methods such as isostatic pressing and hot pressing according to actual product requirements, and processing the circular ring into an involute standard straight ruler cylindrical gear shape; forming a plurality of friction pairs by adopting a gear which is made of a single opposite-grinding material and has the same shape and size with the to-be-tested circular ring, and rotating under the driving of a motor to perform a wear test; and finally, quantitatively analyzing the wear resistance of the composite material by using a high-precision three-dimensional surface profilometer. Compared with the traditional wear test, the method greatly improves the efficiency and accuracy of evaluating the wear resistance of the composite material prepared by powder metallurgy.

The invention discloses automatic test equipment and system for testing product performance. A control board card is placed above a conveyor belt, and when the conveyor belt conveys the control board card to a position between a clamping arm and a measuring arm, the conveyor belt stops, a driving wheel drives a transmission rod to rotate along with the driving wheel. A first bevel gear is connected with the transmission rod, and the first bevel gear rotates along with a driven wheel and drives a second bevel gear to rotate. Due to the fact that gear teeth in a straight gear shape are arranged on the outer side wall of the second bevel gear, racks at the two ends move in the opposite directions, the clamping arm and the measuring arm move close to each other until two electrode contacts make contact with the control board card and are powered on, the control board card is detected, and after detection is completed, the conveyor belt continues to operate to convey the control board card out. Through the structure, automatic detection can be conducted when an operator places the control board card at a fixed station.

The invention relates to a comprehensive demonstration instrument for demonstrating angular momentum conservation and rotational inertia. The comprehensive demonstration instrument is characterized by comprising a singlechip, a digging rope motor and a variable frequency driving motor, wherein the singlechip is used as the control center of the comprehensive demonstration instrument. The comprehensive demonstration instrument further comprises a support shaft, wherein a rotating arm which rotates along with the support shaft is arranged on the support shaft; heavy balls are sleeved at two sides of the rotating arm; the heavy balls are connected with an edge digging rope and are driven by the digging rope; the two heavy balls are pulled to synchronously move inwards / outwards along the rotating arm; the support shaft is connected with the center of an outer rotating disc below the support shaft; a clamping groove is formed below the outer rotating disc; the clamping groove is gear-shaped; the clamping groove is internally provided with an inner rotating disc; the inner rotating disc is fixedly connected with a clamping plate through a torsional spring; the clamping plate corresponds to the clamping groove; when the variable frequency driving motor is started, the inner rotating disc is driven by the variable frequency driving motor to rotate, the torsional spring deforms, the clamping plate is meshed with the clamping groove, the outer rotating disc is driven to rotate, and the outer rotating disc drives the support shaft to rotate; and when the variable frequency driving motor is stopped, the speed of the inner rotating disc is smaller than the speed of the outer rotating disc, the torsional spring resets, and the clamping plate is separated from the clamping groove.

The invention discloses a travelator suitable for an underground aerial passenger device. The travelator mainly comprises a conveying element and a belt (7). The conveying element comprises a main machine (1), a driving wheel (3) and driven wheels (6); the main machine (1) drives the driving wheel (3) by a driving main shaft (9), gear slots are formed in the surface of the driving wheel (3), and the driving wheel (3) is connected with a gear on the inner side of the belt to drive the belt (7) to move; the driven wheels (6) can rotate freely, are small and densely arranged, and are used for supporting the belt (7); the outer surface of the belt (7) is flat, the inner surface is in a regular gear shape and the belt (7) is matched with the driving wheel (3). The travelator is arranged at boarding and alighting positions of the underground aerial passenger device, and is matched with an aerial passenger transport system to form an underground transportation system. The system can greatly increase safety of workers taking the aerial passenger device.

The invention belongs to the technical field of structural strength simulation, and particularly relates to an aviation spur gear shape modification method based on dynamic simulation. The method comprises the following steps: establishing a spur gear three-dimensional mathematical model by utilizing three-dimensional modeling software, entering finite element grid division software, importing the spur gear three-dimensional mathematical model, setting finite element division conditions, and performing grid division; importing the grid model into finite element analysis software, setting material parameters, setting calculation conditions and carrying out calculation; viewing and checking a gear dynamic simulation result; modifying the shape of the gear in three-dimensional software, and improving the contact state. The dynamic meshing process of the gear can be visually displayed, the problems of gear interference, abnormal contact of tooth crests and tooth roots and the like possibly occurring in design and use can be found in time, and the contact state can be effectively improved through gear shape modification; according to the method, the dynamic stress change in the gear meshing process can be obtained, the stress result is checked, the operation stability is checked, and the finite element simulation accuracy of the aviation high-speed heavy-load spur gear is effectively improved.

A gear machining method includes: roughing a workpiece while causing a cylindrical hob cutter to rotate in synchronization with a rotation of the workpiece such that a cutting allowance remains; and finishing by cutting off the cutting allowance remaining on the workpiece on which the roughing has been performed during the roughing to form a desired gear shape by feeding a skiving cutter relatively to the workpiece in the rotation axis direction of the workpiece while causing the skiving cutter to rotate in synchronization with the rotation of the workpiece.

The invention discloses a tooth turning tool structure with a wear-resistant tool nose and a tool feeding method. A tooth turning tool is in a section gear shape and is provided with the tool nose and a tool body. The tool nose is fan-shaped and is made of a hard wear-resistant material. The tool body is made of a material with good toughness, impact resistance and machinability, and the tool body is rigidly connected with the tool nose. The edge curve of the tool nose is a section of space curve conjugated with the tooth surface of a workpiece, the tool nose is fed alternately along the tooth surfaces on the two sides of a tooth groove of the gear-shaped workpiece by combining a generating method and a tangent method, and compared with a traditional tooth turning tool and a tool feeding method, the tool nose has the advantages of being resistant to abrasion, low in use cost, resistant to impact and capable of restraining vibration, different modification machining requirements on tooth surfaces on the two sides of the gear-shaped workpiece can be flexibly met, and the device is further suitable for finishing a honing wheel.

The invention discloses a pressure quenching die and technology for a large-diameter thin arc plate carburized gear, relates to the technical field of heat treatment pressure quenching dies and technologies, and solves the technical problems of heat treatment deformation and low production efficiency of an existing control gear. The pressure quenching die comprises a mandrel base, a blocking plate, a supporting plate, an outer ring supporting ring, a guide cone fixing screw, an outer pressing ring, an inner pressing ring, an inner hole die guide cone, an inner hole expanding die, a screw, a spring, a fixing ring, a guide cone reset spring, a hexagon socket cap screw, a standard elastic washer, an ejector rod and a ring spring. The gear is heated to the quenching temperature, the temperature is kept for a period of time, the gear is transferred from a heating furnace and is sleeved with the pressure quenching die by the aid of a special extraction assistive tool, a press is started, plane warping, limiting diameter, height size and the like are corrected under the combined action of the press and the die, a part meeting the finish machining requirement is obtained. The die has the characteristics of being convenient to operate, long in service life, good in gear shape correction effect and the like, and is worthy of application and popularization.

The invention discloses a gear shaping machine capable of adjusting a cutter position. A lifting threaded hole is formed in the bottom surface of a swing rod; a lifting gear is pivoted to the bottom face of the swing rod. A driving threaded hole is formed in the center of the lifting gear; the upper part of the ball pull rod is screwed in the lifting threaded hole and the driving threaded hole; semi-cylindrical groove-shaped upper insertion grooves with upper openings and lower openings are formed in the end faces, close to each other, of the pair of cutter position adjusting seats correspondingly; a lifting driving motor is fixed on the bottom surface of the cutter position adjusting seat; lifting driving gears are fixed at the lower ends of output shafts of the lifting driving motors; a vertical connecting rod is vertically and telescopically arranged on the bottom surface of the cutter position adjusting seat; a lower limiting seat is formed at the bottom of the vertical connecting rod; semi-cylindrical groove-shaped lower limiting grooves with upper and lower openings are formed in the end faces, close to each other, of the pair of lower limiting seats correspondingly. The vertical connecting rod is provided with scale marks in the vertical direction.

The invention discloses an automatic press-in device for a flat wire hairpin coil and a stator iron core. The automatic press-in device comprises a frame body which is fixedly connected with a servo motor, a lead screw assembly and a linear guide rail, the servo motor is connected with the lead screw assembly; a screw cap of the lead screw assembly is fixedly connected with the connecting plate; the linear guide rail sliding block is fixedly connected with the connecting plate; the connecting plate is fixedly connected with the floating plate; the floating plate is fixedly connected with the special-shaped flat wire hairpin end face positioning disc and the air cylinder; a lower part of the floating plate is fixedly connected with a special-shaped flat wire hairpin groove positioning disc and a hairpin coil end part gear shaping positioning disc; an air cylinder rod of the air cylinder is connected with a rotary disc of the hairpin coil end gear shaping positioning disc; and the mold disc is fixedly connected with a positioning key. The device is advantaged in that the hairpin coil at the end part is integrally positioned and protected, the hairpin coil is accurately pressed into each opposite groove of the stator iron core, accuracy of the pressed coil at the end part is consistent, and automatic pressing of the hairpin coil and the stator iron cores with different stack thicknesses can be realized by controlling the stroke in a servo manner.

A gear cutting machine for gear cutting a workpiece (W) using a gear shaped cutter (17), by engaging and rotating the workpiece (W) that can rotate around a workpiece axis and a gear shaped cutter (17) that can rotate around a cutter axis, while cutting and feeding the gear shaped cutter (17), including:rough cutting at a cross axis angle to the cutter axis, then moving the cutter axis by moving a predetermined angle around the workpiece axis, and performing finish cutting such that the cutter axis has an angle with regard to the workpiece axis in a plane that includes the feeding axis direction and the cutting direction after moving.

The invention discloses a cold heading forming process of an automobile safety belt torsion shaft. The cold heading forming process comprises the following steps of a, shearing; b, preforming one endof two end faces of the blank obtained in the step a, and shaping the end face of a rod part at the other end; c, upsetting the preformed end of the blank obtained in the step b into a gear blank; d,punching the gear blank on the blank obtained in the step c, so that a gear shape is formed; e, upsetting the other end of the blank obtained in the step d into a gear blank in a main die by using three Half dies; and f, punching and cutting the gear blank obtained by upsetting the blank obtained in the step e through the Half dies to obtain a tooth profile. According to the cold heading forming process of the automobile safety belt torsion shaft, the Half dies are utilized, the rotation adjusting procedure of the blank in equipment is eliminated, the purpose of one-time forming of a part is achieved, the machining precision and machining efficiency of the part are improved, and in the process, the material utilization rate can reach 95.4%, so that the material utilization rate is greatlyimproved, and the processing cost is saved.

The invention discloses a deformable wheel capable of climbing stairs. The wheel comprises an outer wheel hub and an inner wheel hub which are coaxially arranged and can relatively rotate; the outer edge of the outer wheel hub is evenly and fixedly provided with a plurality of fixed spokes, and wheel flanges are hinged to the two sides of the top of each fixed spoke respectively; every two adjacent wheel flanges are connected through a sliding groove and sliding pin structure; movable spokes the number of which is equal to that of the fixed spokes on the outer wheel hub are hinged to the innerwheel hub, and the other end of each movable spoke is connected with the two corresponding wheel flanges through the corresponding sliding groove and sliding pin structure. The inner wheel hub is controlled to rotate relative to the outer wheel hub, each movable spoke drives movable ends of the two corresponding wheel flanges to be folded or unfolded, all the wheel flanges can be changed into a pointed gear shape or a circular shape, and therefore the purpose of automatic conversion between the mode of walking on the ground and the mode of walking up and down stairs is achieved. The wheel hasthe advantages that the structure is compact, the strength is ensured, the stability is good, the functions are easy to achieve, the automation degree and followability are high, and the applicationrange is wide.

A roller screw drive linear actuator is characterized by comprising a screw (1), a screw gear (11), a roller (6), planet carriers (4 and 9), a nut (3), an external nut (7) and a lug (15). Pitch and number of internal thread of the nut (3) are equal to those of thread of the screw (1). Lead of the roller (6) is equal to that of the internal thread of the nut (3). The part of the internal thread of the external nut (7), meshing with the thread of the lug (15), is subjected to gear shaping for the left internal thread, and shaped teeth mesh with the external gear of the screw gear (11), while drive ratio of the shaped teeth is equal to that of the whole roller screw drive linear actuator. The roller screw drive linear actuator is simple in structure, stable in transmission, small in transmission clearance, high in transmission precision, low in noise, high in dynamic responsiveness and constant in transmission ratio and enables speed closed-loop control and displacement closed-loop control to be simpler.

The invention provides a walking mechanism used between working face hydraulic supports. The walking mechanism comprises a driving part and a wheel type walking mechanism. The driving part is connected with the wheel type walking mechanism and used for driving the wheel type walking mechanism to move forwards. The wheel type walking mechanism comprises at least one pair of driving wheels; grooves in the shape of a bevel gear are distributed on the surface of the driving wheel, and the cross section of each groove is semicircular. The inclined grooves are fully distributed in the driving wheels, and the diameter of the grooves is matched with the wall thickness of the track, so that the friction force between the walking mechanism and the track when the walking mechanism crosses the track is increased, and the walking mechanism can stably drive into the next-stage track when walking to the gap of the track; the guide wheels are arranged on the periphery of the walking mechanism, the side faces of the driving wheels are prevented from making contact with the side faces of the tracks, the direction is corrected, and the effects that the walking mechanism of the robot can travel on discontinuous tracks to cross track gaps and adapt to horizontal and vertical deviation existing between the two tracks are achieved.

The invention discloses an electrochemical machining device and method for an internally-oblique micro line segment gear. The electrochemical machining device comprises a power system, a PLC control system, an electrolyte circulating filtration system, a numerical control rotary table, a cathode system and a workpiece clamp. According to the method, a sheet-shaped cathode which is machined by a high-precision linear cutting machine and has the thickness of 1mm is used, and the gear outline shape on a tool cathode is obtained by the fact that a workpiece inner gear shape to be machined and formed is offset to the inner side by a machining gap delta in the radial direction; in the machining process, the tool cathode makes rotating movement around a shaft while being fed downwards in the radial direction, and workpieces are machined according to an electrochemical anodic dissolution principle; the spiral angle of an inner gear is guaranteed by the speed ratio of axial feeding and rotary feeding around the shaft, and when the spiral angle of the gear is changed, corresponding angle machining can be achieved through change of the speed ratio of the axial feeding and the rotating movement around the shaft. The electrochemical machining device and method are beneficial to improving the machining efficiency and the gear forming precision.

A resin-made auxiliary gear for an internal combustion engine with which the desired backlash with a motive power transmission gear made from a metal material that the auxiliary gear meshes with is achieved even after the auxiliary gear has been immersed in lubricating oil containing a blow-by gas or dew condensation water, gear cost can be reduced, durability can be improved, and meshing sound can be reduced. An auxiliary gear 82 for an internal combustion engine meshes with a motive power transmission gear 47 that transmits driving force of a crankshaft 31 to auxiliary machinery 8 of an internal combustion engine 3, wherein the motive power transmission gear is made from an iron-based metal material and is provided so as to rotate integrally with the crankshaft, the auxiliary gear for an internal combustion engine is a resin-made gear made by injection molding into a single composition of a heat-resistant resin not containing reinforcing materials such as fibers, the auxiliary gear is provided to a rotating shaft 88 rotatably supported inside a crank case 35 that supports the crankshaft, and the gear shape of the auxiliary gear for an internal combustion engine in a completely dry state before initial use is set so that the backlash with the motive power transmission gear is greater than a prescribed minimum state when the auxiliary gear for an internal combustion engine is in a maximum swollen state of having absorbed moisture.

The invention discloses a three-arc harmonic gear shaper cutter, which belongs to the technical field of harmonic reducer gear processing cutters. The basic tooth profile of the cutter tooth is composed of three sequentially tangent circular arc segments; The radius of the upper arc segment is ρ 1 , the radius of the arc segment is ρ 2 and the radius ρ of the lower arc segment 3 ; Also discloses a tooth profile design method of a three-arc harmonic gear shaper cutter, which designs a three-arc tooth profile of a flexible spline and a three-arc tooth profile of a rigid spline, based on the obtained three-arc tooth profile of a rigid spline The circular arc tooth profile adopts the gear meshing kinematics method to obtain the theoretical conjugate tooth profile of section A, the theoretical conjugate tooth profile of section B and the theoretical conjugate tooth profile of section C; the upper arc section Ac1 and the lower section are obtained by arc fitting. The circular arc segment Ac3 and its related parameters; the middle circular arc segment Ac2 and its related parameters are obtained through the plane analytic geometry method; finally, the auxiliary parameters are determined according to the process requirements of the processed harmonic gear to achieve the three-arc harmonic The purpose of wave gear working tooth profile.