341 results about "Rooted tooth" patented technology

A seat adjustment mechanism includes a first component and a second component movable relative to the first component. A drive mechanism is drivingly connected to the second component for moving the second component relative to the first component. The drive mechanism includes a drive motor drivingly connected to a first gear member having conical involute teeth. A second gear member includes conical involute teeth in meshing engagement with the conical involute teeth of the first gear member. The conical involute teeth have a tapered tooth thickness, a tapered root and a tapered outside diameter.

The invention provides an assembling and meshing precision adjusting method for a harmonic reducer, and relates to the technical field of reducers, the harmonic reducer comprises a flexible gear and a rigid gear with specific tooth profiles, and the tooth profile of the flexible gear comprises a first arc tooth top and a first arc tooth root; the tooth profile of the rigid gear comprises a second planar tooth top, transition arcs located at the vertex angles of the two sides of the second planar tooth top and a second arc-shaped tooth root. The elliptical wave generator is used for driving the flexible gear; the wave height of the wave generator is defined as the difference between a long half shaft and a short half shaft; the method comprises the following steps: acquiring a tooth profile parameter set of a flexible gear and a rigid gear, wherein the tooth profile parameter set comprises a first tooth crest arc radius, a first tooth root arc radius, a second tooth crest plane width and a second tooth root arc radius; based on the tooth profile parameter set, according to a preset matching relation used for optimizing the meshing performance, cooperatively determining a target wave height matched with the tooth profile parameter; and according to the target wave height, a corresponding wave generator is selected to complete the assembly of the harmonic reducer.

The invention belongs to the field of data processing, particularly relates to a wind turbine generator gear box tooth surface strength optimization method considering multi-working-condition load distribution, and aims to solve the problem that the optimization effect is affected due to the fact that strength optimization checking is carried out only for a single working condition in the prior art. The method comprises the following steps: acquiring working condition data of the gearbox under various preset working conditions; load spectrum decoupling processing is conducted on the working condition data, a dynamic load distribution matrix synchronous with the tooth surface meshing period is determined, stress field conversion is conducted on the dynamic load distribution matrix, and a tooth root bending stress field and a tooth surface contact stress field are obtained; inputting the tooth root bending stress field and the tooth surface contact stress field into a pre-constructed double-constraint optimization model to obtain a tooth surface strengthening parameter tensor output by the model; and inputting the tooth surface strengthening parameter tensor into a preset process mapping system. Based on the method provided by the invention, the multi-working-condition operation data of the gearbox are synchronously obtained for optimization calculation, and the limitation of traditional single load analysis is broken through.

The invention relates to the field of mechanical transmission control, and discloses a self-adaptive torsion optimization method and system based on a stress model. The method mainly comprises the following steps: acquiring strain, temperature and vibration data of a transmission system in real time through a distributed sensor network; constructing a three-dimensional dynamic stress field model, and marking a high-risk area; dynamically adjusting a safety threshold based on material fatigue characteristics, and generating a torque control curve by adopting an optimization algorithm; and eliminating response delay through a pre-compensation mechanism. The system comprises an edge calculation unit, a millisecond-level actuator and a grading protection module. According to the method, the tooth root stress concentration is successfully inhibited by 35% in the wind power gear box, the impact load is reduced by 52% in the industrial robot joint, the equipment reliability is remarkably improved, and the service life is remarkably prolonged. The device is suitable for transmission systems of wind power, electric automobiles, industrial robots and the like.

The invention belongs to the technical field of gear machining, and discloses a gear milling blade and a disc-shaped milling cutter. The tooth milling blade comprises a side edge, a top edge and an auxiliary edge, wherein the top edge is arranged between the side edge and the auxiliary edge; the outer contour line of the top edge protrudes towards the workpiece to be machined, the outer contour line of the top edge comprises a top edge arc line and an oval arc line, one end of the top edge arc line is connected with the outer contour line of the side edge, and the other end of the top edge arc line is an end point E; one end of the elliptic arc line is connected with the end point E and is tangent to the end point E, and the other end of the elliptic arc line is connected with the outer contour line of the auxiliary blade. The tooth milling blade is provided with an elliptical profile curve, so that the curvature distribution on a tooth root transition curve can be effectively improved, the curvature radius of the tooth root transition curve is increased and the tooth root stress is reduced when a tooth groove is cut, and thus the tooth root strength of an involute gear is improved; and meanwhile, the elliptic arc line and the top edge arc line are connected and tangent at the end point E, so that the outer contour line of the top edge is ensured to be smooth.

The invention relates to the field of mechanical engineering, in particular to a multilevel screening speed reducer tooth matching method based on a standardized box body, which comprises the following steps of: acquiring basic parameters of an input gear speed reducer and parameters of each transmission stage, and acquiring derived parameter limit ranges of the basic parameters and the parameters; screening out a tooth matching scheme meeting user input constraint conditions, marking the tooth matching scheme as a candidate set # imgabs0 #, screening a serializable scheme based on general requirements of a serialized speed reducer on a final-stage gear pair, marking the serializable scheme as a candidate set # imgabs1 # on an existing standardized box body, designing a transmission system, and checking through tooth root bending fatigue strength to obtain a final-stage gear pair final-stage gear pair; and marking the tooth matching schemes meeting the strength requirement as a candidate set # imgabs2, performing serialized screening again based on the general requirement of the serialized speed reducer on the final-stage gear pair, and marking the schemes meeting the serialization as a final candidate set C1. According to the multi-layer screening mechanism, the tooth matching scheme meeting the strength requirement is rapidly matched for the serialized speed reducer.

The invention discloses a gear pair life prediction method based on dynamic stress, belongs to the technical field of reliability design of mechanical transmission systems, and aims to solve the problem of inaccurate life prediction caused by neglecting a dynamic effect and a real surface topography in an existing gear design method. The method comprises the following steps: firstly, acquiring gear pair interface mechanical property parameters considering shafting vibration, dynamic load and surface roughness, wherein the parameters comprise transient oil film pressure, friction coefficient, oil film thickness and shear stress; solving a three-dimensional subsurface stress field by adopting an algorithm and calculating von Mises equivalent stress distribution; stress volume integration is conducted on different rough surfaces, the honed surface is used as the reference, the relative fatigue life of other surfaces is calculated based on the Zaretsky life prediction theory, and accurate prediction and process optimization of the contact fatigue life are achieved; meanwhile, the dynamic bending stress of the tooth root is calculated based on the dynamic normal load, and the bending fatigue safety coefficient is checked.

The utility model relates to the field of machining tools, and discloses a machining tool for an external spline with side teeth, which comprises an external spline hobbing cutter and an external spline side tooth milling cutter, a plurality of groups of hobbing cutter teeth are arranged on the external spline hobbing cutter along the axial direction, a root digging structure is arranged at the tooth top of each hobbing cutter tooth, and a chamfer is arranged at the tooth root of each hobbing cutter tooth; the external spline side tooth milling cutter comprises a milling cutter rod, a milling cutter blade is installed at the end of the milling cutter rod, an involute-shaped cutting edge is arranged on the milling cutter blade, and a plurality of involute cutting edge teeth are arranged on the cutting edge side by side. The external spline driving shaft capable of machining the spline with the side teeth solves the problem that in the prior art, a cutter capable of machining the external spline of the spline driving shaft in the design does not exist, and the machining requirement of the external spline with the side teeth cannot be met.

The utility model relates to a brush head and an electric toothbrush, the brush head is configured to be installed on a machine body and comprises a brush head body, a cleaning part and a transmission part, the cleaning part comprises a first brush head and a second brush head, and the second brush head is configured to be pivotable; the transmission part comprises a first transmission piece and a second transmission piece, the first transmission piece and the second transmission piece are connected through a connecting piece, in the extension direction of the first axis, by taking the connecting piece as a boundary, one end of the second transmission piece is configured to be matched with a limiting part correspondingly arranged on the machine body, and the other end of the second transmission piece is configured to be eccentrically matched with the second brush head; the electric toothbrush comprises a machine body, a power shaft and a brush head, the brush head is connected with the machine body through the power shaft, the power shaft is constructed as an external vibration source of the brush head, and a cleaning part of the brush head is constructed to vibrate relative to the machine body. According to the brush head and the electric toothbrush provided by the invention, multi-mode composite motion of reciprocating vibration and reciprocating rotation can be realized, and the cleaning capability on interdental crevices and tooth roots is enhanced.

The invention discloses a detection method and device of a tooth root stress test system and a medium, the tooth root stress test system comprises a plurality of tooth root stress detection units, the tooth root stress detection units are attached to the surface of a tooth root, each tooth root stress detection unit comprises a plurality of strain gauges, and each strain gauge comprises a positive terminal and a negative terminal; in the same tooth root stress detection unit, the strain gauges are connected in series; the detection method of the tooth root stress test system comprises the following steps: acquiring a current total resistance value of the tooth root stress detection unit and a theoretical total resistance value after the strain gauges are connected in series; judging whether the difference value between the current total resistance value and the theoretical total resistance value is within a first difference value preset range or not; and if yes, determining that each strain gauge in the tooth root stress detection unit is normally insulated.

The invention discloses a method for calculating wind resistance power loss under oil injection lubrication of a spiral bevel gear pair, and belongs to the field of aero-engine power transmission systems. The method comprises the following steps: constructing a gear tooth surface equation of the spiral bevel gear pair based on a Cartesian coordinate system; establishing a spiral bevel gear pair parameter model provided with an oil injection lubrication system; calculating tooth surface wind resistance power loss, large and small end surface wind resistance power loss, front and rear conical surface wind resistance power loss, tooth crest circumferential surface wind resistance power loss, tooth groove and tooth root wind resistance power loss and pump flow wind resistance power loss of the spiral bevel gear pair; and all the wind resistance power losses are added to obtain the total wind resistance power loss of the spiral bevel gear pair under oil injection lubrication. According to the method, a special analytical model is established for each region, regional modeling can be more suitable for an actual flow field, and the wind resistance power loss of the spiral bevel gear pair can be accurately calculated.

The utility model relates to the technical field of gear detection, and discloses a gear thickness detection device which comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with an L-shaped plate and a supporting plate, the other end of the L-shaped plate is connected with a detection mechanism, the upper end of the supporting plate is connected with a rotating mechanism, and one end, close to the L-shaped plate, of the rotating mechanism is connected with a moving mechanism. The other end of the moving mechanism is connected with two clamping assemblies, the other ends of the two clamping assemblies are connected with clamping rods, and the two clamping rods are parallel up and down. According to the gear thickness detection device, when the tooth thickness of a gear needs to be detected, only the clamping assembly needs to be controlled to move through the moving mechanism, then the gear can be clamped from the two sides through the two clamping rods, then the height of a tooth root is detected through the detection mechanism, and after the gear is controlled to rotate by a certain angle through the rotating mechanism, the gear thickness is detected. And the height of the tooth crest is detected through the detection mechanism, and finally the height difference between the tooth root and the tooth crest is obtained, so that the tooth thickness can be directly obtained, and convenience and rapidness are achieved.

The invention discloses an involute helical gear forming grinding force prediction method, which comprises the following steps: firstly, based on a helical gear forming grinding space motion relationship, establishing a helical tooth surface model comprising an involute surface and a tooth root transition curved surface, and constructing a geometric contact model of a grinding wheel and a gear; then, tooth surface deformation data obtained after heat treatment are obtained through a three-coordinate measuring machine, coordinate mapping is carried out, and the grinding depth and contact parameters are corrected; on the basis, a grinding force integral model considering the heat treatment influence is established by combining a plane grinding mechanism, and integral calculation is carried out on tangential and normal grinding force of a tooth surface involute section, a transition arc section and a tooth bottom section; finally, actual measurement data are obtained through a grinding experiment, and model parameter calibration is completed. According to the method, dynamic and accurate prediction of tangential and normal grinding force in the bevel gear forming and grinding process can be achieved, and a reliable basis is provided for mechanical behavior analysis and process optimization in the gear machining process.

The invention provides a design method of a full-life diamond roller for a powerful inner honing wheel. The design method comprises the steps that design parameters of the diamond roller are determined according to parameters of an outer gear and the inner honing wheel; the design parameters of the diamond roller comprise a normal modulus Mn, a circle dividing normal pressure angle Afn, a helix angle Bf2, a tooth number Z2, a displacement coefficient Xn2, an addendum circle diameter Deg2, a root circle diameter Dig2 and an effective starting circle diameter dyx2; and calculating the addendum circle diameter and addendum width of the diamond roller. According to the parameters of the new inner honing wheel and the old inner honing wheel, design parameters of the two sets of diamond rollers are determined respectively, and then the design parameters of the full-life diamond roller are obtained through intersection; the tooth crest width of the diamond roller is checked, it is guaranteed that the tooth crest does not become sharp, parameters of the diamond roller are optimized, the optimality of the honing process is guaranteed, the diamond roller is designed only in 20 minutes at present, and compared with dozens of hours in the prior art, efficiency is greatly improved, and the new product development period is shortened.

The invention discloses a rotary speed reducer gear tooth root strength test device which comprises a test bed, a mounting mechanism, a rotating mechanism, a limiting mechanism, a strength test mechanism and an observation mechanism. A mounting mechanism is arranged in the center of the test bench to fix a to-be-tested gear and can adapt to replacement of gears of different specifications; the mounting mechanism is connected with a rotating mechanism under the test bench, and a rotating motor is provided with an encoder to realize accurate rotation angle switching of a gear; limiting mechanisms are arranged on the left and right sides of the mounting mechanism and can move in the radial direction to be engaged with the gears for limiting or separated for avoiding. Strength test mechanisms are arranged in front and back, can be adjusted in the radial direction, can be meshed with a single tooth to apply force, and can be fed back by a force sensor to switch postures by rotating an oil cylinder and an air cylinder; an observation mechanism on the strength test mechanism is used for detecting tooth root cracks by using an endoscope and marking the tooth root cracks through a spray head. The device does not need repeated positioning, can continuously detect each tooth root, improves the efficiency and precision, is adaptive to gears of various specifications, and meets the industrial detection requirements.

The invention provides a bionic stubble cutting knife, a bionic stubble cutting knife device and a design method, and relates to the technical field of agricultural machinery, the bionic stubble cutting knife comprises a knife disc base body and a plurality of knife teeth uniformly distributed along the circumference of the knife disc base body in the same direction, each knife tooth comprises a main cutting edge, a tooth tip, a knife back and a tooth root reinforcing rib which are connected in sequence, and the angle of the main cutting edge imitates the upper jaw of a earwig. The outer contour curve of the cutter tooth is formed by sequentially connecting a main cutting edge curve, a tooth top curve, a cutter back curve and a tooth root reinforcing rib curve in a transition mode, and the connecting points of the curves are tangent. The bionic stubble cutting knife device comprises a bionic stubble cutting knife, a connecting structure, a vibration reduction structure, a connecting spring and a driving device, and the vibration reduction structure adopts a two-stage composite vibration reduction system. Through a bionic cutting structure, a two-stage vibration reduction system and a flexible adaptive design, cooperation of efficient cutting, stable operation, cost reduction, efficiency improvement and environmental protection is achieved, a better solution is provided for agricultural stubble cutting operation, and technological upgrading of agricultural machinery equipment is promoted.

The invention relates to a geometric parameter optimization design method for a large-overlap-ratio gear, and belongs to the field of vehicle transmission design. According to the technical scheme, the geometric parameter optimization design method for the large-overlap-ratio gear comprises the following steps that S1, initial parameters of a gear pair are determined according to the speed ratio requirement and the center distance; s2, dense tooth optimization is carried out according to the tooth root strengthening effect; s3, the addendum circle is determined according to the requirement of the sliding rate # imgabs0 #; s4, distributing tooth thickness according to fatigue life and backlash requirements; s5, determining a dedendum circle according to a top clearance requirement; and S6, performing tooth root transition curve optimization and hob design according to the re-determined gear parameters, and performing hobbing simulation verification. According to the scheme, gear tooth high-strength design and dense tooth optimization are achieved through a tooth root transition curve optimization method, the meshing efficiency and the transmission stability are further considered, the tooth height is controlled and optimized through the sliding rate, the tooth thickness and the backlash are distributed by balancing the fatigue strength of the paired gear, and the macroscopic geometric parameter optimization design of the gear is achieved.

A method of making a tooth profile surface on a workpiece. The method includes providing a gear cutting tool and rotating the gear cutting tool about an axis of rotation. The cutting tool and the workpiece engage each other and roll together according to the generating roll to create a contoured surface of the tooth. The generating roll includes a first roll ratio and a second roll ratio, where the first roll ratio and the second roll ratio are different from each other, and one of the first roll ratio and the second roll ratio results in a contoured section being formed on the tooth profile surface.

The invention relates to a rotor shaft of a rotor of an electric machine, comprising a shaft component (3) on which a toothing portion (7) having an external toothing (8) is directly formed and on which a first and a second, in each case radial, rolling element raceway (9, 10) are directly formed axially adjacent to the toothing portion (7), wherein: the toothing portion (7) is provided axially between the first and the second rolling element raceway (9, 10); an annular first rolling bearing (11) comprising first rolling elements (16) guided in a first cage (15) is seated on the first rolling element raceway (9), said first rolling elements rolling directly on the first rolling element raceway (9), and an annular second rolling bearing (13) comprising second rolling elements (18) guided in a second cage (17) is seated on the second rolling element raceway (10), said second rolling elements rolling directly on the second rolling element raceway (10); the diameter (dH1) of an envelope circle of the first rolling elements (16) is less than the diameter (dF) of a root circle of the external toothing (8); and the diameter (dH2) of an envelope circle of the second rolling elements (18) is greater than the diameter (dK) of a tip circle of the external toothing (8).

Electric motor device (10) for driving a sunroof (2) or a roller blind in a vehicle (100), comprising: a rotor device (20) comprising an at least partially cylindrical outer surface (21); a stator device (30) having a core (31) including a plurality of stator teeth (32) projecting toward the rotor device (20), the stator teeth (32) comprising a tooth root (33) connected to a stator ring (34) and a tooth tip (35) having a wing-shaped tooth shoulder (36) on each side in a circumferential direction, the wing-shaped tooth shoulder (36) having a tip (37) formed at an end portion (47) of the respective wing-shaped tooth shoulder (36) in the circumferential direction; wherein the tooth tip (35) includes a surface (39) facing the at least partially cylindrical outer surface (21) of the rotor device (20) to form a gap (40) therebetween; wherein the surface (39) comprises: - a hollow cylindrical surface section (41) having a constant gap distance (g1) in the direction of the at least partially cylindrical outer surface (21) of the rotor device (20) in the circumferential direction, and - each having an inclined surface portion (42) having an increasing gap distance (g2) with respect to the at least partially cylindrical outer surface (42) of the rotor device (20) in the circumferential direction towards the respective tip (37) formed by the end portion in the circumferential direction; wherein the hollow cylindrical surface portion (41) includes a first radius (r1) with respect to a center axis (C) of the rotor device, and the tip (37) formed at the end portion in the circumferential direction has a second radius (r2) with respect to the center axis (C) of the rotor device (20); wherein a first ratio (r2 / r1) between the second radius (r2) and the first radius (r1) is 1.02 or more and 1.08 or less.

The application discloses a burr cleaning equipment for gear machining, and belongs to the technical field of gear machining, and the technical key points are as follows: the burr cleaning equipment comprises a bottom plate, a gear positioning mechanism and a gear polishing mechanism are arranged, and the gear body can be clamped and fixed in a self-adapting mode according to the inner diameter of the gear during burr cleaning, manual intervention is greatly reduced, the labor intensity of an operator is reduced, and the synchronous burr cleaning mode for the tooth surface, the tooth top and the tooth root reduces the corresponding clamping frequency and adjustment time, and the overall machining efficiency is significantly improved; the gear taking mechanism can quickly and stably complete gear grabbing, discharging and grabbing feeding operations, the movement characteristics of the multi-degree-of-freedom moving assembly can significantly shorten the single feeding and discharging time, the production efficiency is significantly improved compared with traditional equipment, and the burr cleaning equipment has the advantages of convenient gear taking and placing, high automation degree and high working efficiency.

The invention provides a fir-shaped assembly molded line suitable for a high-rotating-speed turbine moving blade and a design method. The tooth crests of all blade root teeth located on the same side are tangent to the same blade root outer tangent line, and the groove bottoms of at least two blade root grooves located on the same side are tangent to the same blade root inner tangent line; the included angle VA between the outer tangent lines of the two blade roots is 30-40 degrees; the included angle VB between the two blade root inner tangent lines is 20-30 degrees; the inclined angle VC of the blade root tooth working surface part relative to the blade root top surface part is 20-30 degrees; the included angle VD between the blade root tooth working face part and the blade root tooth non-working face part ranges from 40 degrees to 50 degrees. The working face portions of every two adjacent blade root teeth located on the same side are parallel in pairs. The molded line is obtained through optimization after the strength performance, the machining feasibility, the production cost and the period are comprehensively considered, and the molded line has the advantages of being good in strength performance and convenient to machine and manufacture and can be particularly applied to a regulating stage moving blade or a last stage long blade of a high-rotating-speed turbine.

The present application relates to gear processing forging equipment technical field, specifically a kind of temperature monitoring function's gear processing is forged device, and the forging device includes first forging machine, second forging machine, manipulator, test table, first forging machine is processed into intermediate body by hollow cylindrical raw material block, second forging machine is placed in first forging machine side, second forging machine is processed into gear-shaped forming body by intermediate body, test table is placed in second forging machine side, test table tests the tooth root toughness in the meshing process of forming body, manipulator is set between first forging machine, second forging machine, test table for transferring workpiece.Raw material block is heated to forging point using resistance heating mode, resistance heating electrode is set in first forging machine and second forging machine, first forging machine and second forging machine are with infrared probe to identify the temperature of raw material block and intermediate body in heating process.After obtaining intermediate body, the outer edge of heated intermediate body, so that the material that becomes tooth surface finally in second forging process is based on the material of original outer edge.

The present invention discloses a bevel gear numerical calculation method, system, device and readable storage medium. The bevel gear numerical calculation method includes: obtaining gear parameter information; constructing a finite element model according to the gear parameter information and calculating the overall stiffness matrix of the finite element model; calculating the meshing force of the meshing nodes at different rotation angles by using the loaded contact analysis method according to the gear parameter information; applying fixed displacement boundary conditions to the internal gear ring of the gear in the finite element model to simulate the stationary state of the internal gear ring of the gear; mapping the meshing force of the meshing nodes at different rotation angles to the tooth surface of the finite element model to obtain the tooth surface meshing force result, so as to realize the distribution of the meshing force on the tooth surface; calculating the gear deformation result according to the overall stiffness matrix and the tooth surface meshing force result; and calculating the tooth surface contact stress and the tooth root bending stress based on the gear deformation result. The bevel gear numerical calculation method of the embodiment of the present invention can calculate the tooth surface contact stress and the tooth root bending stress efficiently and accurately.

The large-modulus hardened gear ring structure comprises a gear ring and gear teeth arranged on the inner wall of the gear ring, one end of each gear tooth is a first tooth end, the other end of each gear tooth is a second tooth end, a first step is arranged on one side of each first tooth end, the first step is arranged on the inner wall of the gear ring, and the second step is arranged on the inner wall of the gear ring. A cutting groove is further formed between the first tooth end and the first step and connected between the first tooth end and the first step in a transition mode, the side face, close to the first tooth end, of the cutting groove and the axial end face of the first tooth end are located on the same vertical face, and the bottom end of the first step and the tooth root of the first tooth end are located on the same vertical face. A second step is arranged at the end, away from the first step, of the gear ring and arranged at the joint of the second tooth end and the gear ring, and the axial end face of the second step and the axial end face of the second tooth end are located on the same horizontal plane. According to the device, broken cutting caused by heat treatment deformation of the first tooth end and the second tooth end is reduced, so that the production efficiency of the large-modulus hardened gear ring is improved.

The removable anti-loosening false tooth comprises a false tooth main body, a tooth root connecting block is arranged at the bottom of the false tooth main body through a connecting groove with internal threads, and a tooth root sleeve for performing outer protection positioning on the tooth root connecting block is arranged at a bottom port of the connecting groove and located at the bottom of the false tooth main body; through the false tooth main body, the connecting groove, the tooth root connecting block, the tooth root main body and the threaded connecting part, the false tooth main body is fixed on the threaded connecting part on the tooth root connecting block through threads of the connecting groove for connection and fixation, so that the false tooth main body and the tooth root connecting block can be quickly fixed, and the tooth root sheath is positioned and sleeved outside the tooth root connecting block for protection; according to the structural connection mode, the false tooth main body only needs to be screwed to be separated from the tooth root connecting block in the picking and replacing process, so that the worn false tooth main body can be conveniently picked and replaced, and the problem of gingival injury caused by picking and replacing by virtue of a tool is avoided.

The application discloses a high-bearing low-noise special gear precision machining process, which comprises the following steps: precision die forging and isothermal normalizing, double-reference composite finish turning, self-adaptive roll-scrub composite near-net forming, segmented and partial-pressure gradient carburizing and quenching, deep cryogenic graded aging, reference reconstruction flexible honing polishing, pulse laser shock strengthening, tooth root fillet roll strengthening, full-parameter precision detection, hierarchical selection and micro-correction. The application solves the problems of large deformation, low precision, poor fatigue and high noise in traditional processes through the synergistic control of forming-stress-precision-surface morphology, and the special tooth profile is stably up to DIN 4-5 level, the tooth surface is Ra≤0.2 microns, the fatigue life is increased by more than 60%, and the noise is reduced by 6-10 dB. The process combination is not obvious and has outstanding creativity, and is suitable for high-precision batch manufacturing of special gears of high-end equipment such as new energy vehicles and high-speed heavy-duty transmission.

The utility model provides a screw rotor and a vacuum pump. The screw rotor comprises a rotating shaft and a plurality of rotor blades, the plurality of rotor blades are sleeved on the rotating shaft; each rotor blade comprises a tooth top part, a tooth root part, a chamfer surface and an end surface; the end face is configured to be penetrated by a rotating shaft. The tooth top is provided with a tooth top surface, and the tooth root is provided with a tooth root surface; one side of the chamfered surface is connected with the edge of the tooth top surface, and the other side of the chamfered surface is connected with the edge of the end surface; the tooth root face is provided with a concave part, and the side wall of the concave part is matched with the chamfer face. According to the screw rotor, the chamfered surfaces are arranged at the tooth tops of the rotor blades, and the concave part side walls matched with the chamfered surfaces at the tooth tops are correspondingly arranged at the tooth root parts, so that the machining error caused by secondary positioning of a rotating procedure is avoided on the basis of reducing a gap in the meshing process of the screw rotor; therefore, the sealing precision of the vacuum pump is improved, and finally the working efficiency of the vacuum pump comprising the screw rotor provided by the utility model is improved.

The invention discloses a cycloidal gear tooth profile three-section modification method. The cycloidal gear tooth profile is divided into a tooth root section, a meshing area section and a tooth top section; according to the thickness of the lubricating oil film, the modification gap at the tooth root is obtained, and according to the contact deformation at the tooth crest, the modification gap at the tooth crest is obtained; and by taking the return difference and the minimum contact stress in the dynamic transmission chain precision interval as boundary conditions, the modification clearance of the meshing area is obtained, the modification clearances at the tooth root, the meshing area and the tooth top are combined, and the tooth profile of the cycloidal gear is obtained according to the modification clearance curve. Different modification gaps can be designed according to different return differences and dynamic transmission chain precision intervals. A cycloidal gear tooth profile with controllable return difference and dynamic transmission chain precision and minimum contact stress when lubrication and stable and uniform meshing of a gear pair are considered can be obtained; the method is a modification method with higher precision.