Method, device, terminal and medium for calculating system-level misalignment of hypoid gears

Abstract

The present invention relates to the field of hypoid gear design, and specifically discloses a method, device, terminal and medium for calculating the system-level misalignment of a hypoid gear, constructing a vehicle-bridge system assembly model; pre-processing the vehicle-bridge system assembly model for finite element analysis; constraining the vehicle-bridge system assembly model after pre-processing; loading the vehicle-bridge system assembly model after constraint processing according to working conditions, and solving the stress and strain of the vehicle-bridge system assembly model using finite element software; and calculating the meshing position misalignment of the hypoid gear under the corresponding load working condition according to the solved stress and strain. The present invention calculates the misalignment of the gear meshing pair based on the system deformation caused by loading, so as to pre-compensate the position of the contact mark according to the misalignment, realize the tolerance and coordination of the cycloid hypoid gear design to service, reduce vibration and noise, and improve the life of the transmission system.

Description

Technical Field

[0001] The present invention relates to the field of hypoid gear design, and in particular to a method, device, terminal and medium for calculating system-level misalignment of hypoid gears. Background Art

[0002] Cycloid hypoid gears are important basic units in transmission devices that realize intersecting axis motion transmission and are widely used in aerospace, automobiles, reducers and other fields. They have many advantages such as high load capacity, high reliability, and low noise. The meshing performance of cycloid hypoid gears is extremely sensitive to the curvature change of the contact position. The relative position change of the gear pair during the meshing process is likely to cause unbalanced loads and increased vibration and noise.

[0003] Since the components that make up the transmission system have a certain rigidity, they will inevitably deform under loading, which will cause vibration, generate noise, and reduce the life of the transmission system. At present, in order to solve the problem of vibration and noise caused by system-level deformation, the contact mark position of the gear is generally pre-compensated based on experience during the design stage of the hypoid gear. This design method is not accurate enough and often results in unreasonable pre-compensation, which in turn affects the life of the transmission system. Summary of the invention

[0004] To solve the above problems, the present invention provides a method, device, terminal and medium for calculating the system-level misalignment of quasi-hypoid gears, which calculate the misalignment of the gear meshing pair based on the system deformation caused by loading, so as to pre-compensate the position of the contact mark according to the misalignment, realize the tolerance and coordination of the cycloid quasi-hypoid gear design to service, reduce vibration and noise, and improve the life of the transmission system.

[0005] In a first aspect, the technical solution of the present invention provides a method for calculating the misalignment of a hypoid gear system, comprising the following steps:

[0006] Construct the axle system assembly model;

[0007] Pre-processing of the axle system assembly model for finite element analysis;

[0008] Perform constraint processing on the axle system assembly model after pre-processing;

[0009] Load the axle system assembly model after constraint processing according to the working conditions, and use finite element software to solve the stress and strain of the axle system assembly model;

[0010] The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated based on the solved stress and strain.

[0011] In an optional implementation, calculating the meshing position misalignment of the hypoid gear under the corresponding load condition according to the solved stress and strain specifically includes:

[0012] For the large wheel and the small wheel, three points on a certain circumference are selected to determine a circle, and the gear axis is determined by these three points to express the spatial position characteristics of the large wheel and the small wheel, including the center position of the circle, the normal vector of the circular plane, the axis angle between the large wheel and the small wheel, the offset distance between the large wheel and the small wheel, and the distance from the center of the circle to the axis intersection point;

[0013] Extract the coordinates of each point before and after the load is applied;

[0014] Based on the coordinates of the corresponding points, the spatial position characteristics of the large wheel and the small wheel before and after the load is applied are obtained;

[0015] The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated according to the spatial position characteristics before and after the load is applied.

[0016] In an optional embodiment, the meshing position misalignment of the hypoid gear under the corresponding load condition is calculated according to the spatial position characteristics before and after the load is applied, specifically including:

[0017] The distance from the new center of the circle to the axis intersection after the load is applied is calculated using the following formula (1):

[0018] (1)

[0019] in, R P , R G are the center positions of the small wheel and the large wheel after loading, , are the normal vectors of the circumferential plane of the small wheel and the large wheel after the load is applied, 、 are the distances from the center of the small wheel and the large wheel to the intersection of the axes after the load is applied;

[0020] The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated by the following formula (2):

[0021] (2)

[0022] Among them, Δ E、 Δ P、 Δ G、 Δ α They are offset distance error, small wheel axis error, large wheel axis error, and axis angle error. E.L P 、LG 、α They are the offset distance before loading, the distance from the center of the small wheel to the intersection of the axes, the distance from the center of the large wheel to the intersection of the axes, and the axis angle.

[0023] In an optional implementation, building the axle system assembly model specifically includes:

[0024] Delete the modeling of bolts and screws, and replace them with binding constraints;

[0025] The bearing is simplified by using the interference method between rolling elements and inner and outer rings.

[0026] In an optional implementation, the pre-processing of the finite element analysis of the axle system assembly model specifically includes:

[0027] Perform tetrahedral meshing on target parts;

[0028] Optimize the meshes with aspect ratio less than the threshold;

[0029] Hide unimportant feature lines.

[0030] In an optional implementation, the meshes with a slenderness ratio less than a threshold are optimized, specifically including:

[0031] For meshes whose aspect ratio is less than the threshold, gap merging and node merging are performed.

[0032] In an optional implementation, the axle system assembly model after pre-processing is subjected to constraint processing, specifically including:

[0033] Assemble the components and rotate the large wheel to make the tooth surfaces of the large wheel and the small wheel interfere with each other;

[0034] Bind constraints to the interference fit interface;

[0035] Define contact constraints for gear meshing surfaces and bearing clearance fit interfaces;

[0036] The small wheel axle and the large wheel axle are coupled to constrain their motion and eliminate tooth surface constraints.

[0037] In a second aspect, the technical solution of the present invention provides a device for calculating the misalignment of a hypoid gear system, comprising:

[0038] Model building module: build the axle system assembly model;

[0039] Pre-processing module: pre-processing of the axle system assembly model for finite element analysis;

[0040] Constraint processing module: performs constraint processing on the axle system assembly model after pre-processing;

[0041] Load loading module: Load the axle system assembly model after constraint processing according to the working conditions, and use finite element software to solve the stress and strain of the axle system assembly model;

[0042] Misalignment calculation module: Calculate the meshing position misalignment of the hypoid gear under the corresponding load condition based on the solved stress and strain.

[0043] In a third aspect, the technical solution of the present invention provides a terminal, including:

[0044] A memory for storing a hypoid gear system-level misalignment calculation program;

[0045] A processor is used to implement the steps of the method for calculating the system-level misalignment of a hypoid gear as described in any of the above items when executing the system-level misalignment calculation program of the hypoid gear.

[0046] In a fourth aspect, the technical solution of the present invention provides a computer-readable storage medium, on which is stored a program for calculating the misalignment of a quasi-hyperbolic gear system. When the program for calculating the misalignment of a quasi-hyperbolic gear system is executed by a processor, the steps of the method for calculating the misalignment of a quasi-hyperbolic gear system are implemented as described in any one of the above items.

[0047] The present invention provides a method, device, terminal and storage medium for calculating the system-level misalignment of a hypoid gear, which has the following beneficial effects compared to the prior art: by building a system-level analysis model and a misalignment conversion method, the misalignment of the cycloid hypoid gear when loaded is accurately solved, and the built model can be a simplified model to improve the convergence of the model, and the tooth surface design considering tolerance is guided based on the solution results, so as to achieve high-performance cycloid hypoid gear design-service collaborative manufacturing. The present invention calculates the misalignment of the gear meshing pair based on the system deformation caused by loading, so as to pre-compensate the position of the contact mark according to the misalignment, realize the tolerance and coordination of the cycloid hypoid gear design to service, reduce vibration and noise, and improve the life of the transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 It is a flow chart of a method for calculating the misalignment of a hypoid gear system provided by an embodiment of the present invention.

[0050] Figure 2 This is a schematic diagram of the slight interference treatment between the rolling element and the inner and outer rings.

[0051] Figure 3 It is a schematic diagram of the spatial position characteristics of hypoid gears.

[0052] Figure 4 The present invention provides a schematic block diagram of the structure of a hypoid gear system-level misalignment calculation device.

[0053] Figure 5 It is a schematic diagram of the structure of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0056] Figure 1 : is a schematic flow chart of a method for calculating the misalignment of a hypoid gear system provided by an embodiment of the present invention. Figure 1 The execution subject may be a hypoid gear system-level misalignment calculation device. The hypoid gear system-level misalignment calculation method provided in the embodiment of the present invention is executed by a computer device, and accordingly, the hypoid gear system-level misalignment calculation device runs in the computer device. According to different requirements, the order of the steps in the flowchart can be changed, and some can be omitted.

[0057] like Figure 1 As shown, the method includes the following steps.

[0058] S1, build the axle system assembly model.

[0059] The purpose of this step is to construct a vehicle-bridge system assembly model, and to calculate the system deformation into the amount of misalignment based on the model. The model of this embodiment is simplified, mainly including the following two aspects of simplification to improve the convergence of the model.

[0060] (1) Delete the modeling of bolts and screws, and replace them with binding constraints.

[0061] Delete the modeling of bolts and screws. Since bolts and screws are connecting components with a smaller mass than the entire bridge system, they can be directly replaced by binding constraints in the finite element boundary conditions.

[0062] (2) The bearing is simplified by using the interference method between rolling elements and inner and outer rings.

[0063] Simplify the bearing. Since the bearing is a multi-body system, the balls are constrained by gravity and cages under natural conditions. Therefore, the boundary conditions and working conditions of the bearing in the finite element are extremely complex. It is difficult to constrain each structure in the calculation. When subjected to force, the rolling elements in the opposite direction of the radial force are not in contact with the inner and outer rings. Figure 2 As shown in the figure, there are gaps c1 and c2, which leads to the non-convergence of the analysis. Therefore, a method of slight interference between the rolling elements and the inner and outer rings is adopted. The rolling elements with the same direction as the radial force bear most of the force, and the remaining rolling elements bear very little force, so as to maintain the stiffness of the bearing as much as possible and improve the convergence of the model.

[0064] S2, pre-processing of the finite element analysis of the axle system assembly model.

[0065] The purpose of this step is to mesh the model to perform finite element analysis. In this embodiment, for accurate meshing, tetrahedral meshing is performed on the target parts, and meshes with aspect ratios less than a threshold are optimized, while non-important feature lines are hidden.

[0066] Specifically, tetrahedral meshing is performed on complex parts such as the shell, bearing bracket and cantilever. Since the shell is a casting with a complex structure and its internal features are easily obscured, the shell can be cut and the cut parts can be meshed separately, and the divided surfaces can be bound and constrained during finite element calculations.

[0067] Based on the tetrahedral mesh slenderness ratio, the mesh quality of the model is checked, and all mesh elements that do not meet the slenderness ratio of less than 5 are extracted (the slenderness ratio is the ratio of the longest side to the shortest side of the triangular mesh). They are optimized through two processing methods:

[0068] The first optimization method is gap merging, which eliminates the mesh at the smallest node distance. The unqualified mesh in a certain area is distributed in strips. This situation often occurs at the process fillet or chamfer of the component. The structure here is generally based on assembly specifications. Therefore, mesh processing will not adversely affect the accuracy of the calculation while improving the convergence of the finite element calculation.

[0069] The second optimization method is node merging, which merges the two nodes on the short side of the deformed triangular surface mesh into one node. This can eliminate meshes with excessively large aspect ratios and can be used in most situations where the structural mesh is poor.

[0070] Hide unimportant feature lines. Since automatic meshing is based on feature lines, the transition features at the interface of curved surfaces are very complex. Although direct meshing can improve the accuracy of the mesh model, it is very easy to cause mesh distortion, which is not conducive to the convergence of finite element calculations. Therefore, it is necessary to hide unimportant feature lines by pruning to increase the calculation speed while ensuring the accuracy of the model. Automatic meshing is performed on each feature surface, and local mesh encryption can be performed at some important structures. At this time, the generated mesh attribute is 2D.

[0071] Finally, a 2D grid with good mesh quality is obtained and the 3D mesh division is completed based on it.

[0072] S3, performing constraint processing on the axle system assembly model after pre-processing.

[0073] Based on the finite element model of the axle system obtained in step S2, the motion behavior of the contact surfaces of the bearings and gears is constrained, the matching interfaces of the connecting parts are bound, and the motion state of the gear pair is defined through the coupling points, and finally the clearance of the tooth surface is eliminated.

[0074] Specifically, the constraint processing includes the following steps.

[0075] S3.1, assemble all parts and rotate the large wheel to make the tooth surfaces of the large wheel and the small wheel interfere with each other.

[0076] During specific implementation, the tooth surfaces of the large wheel and the small wheel interfere slightly.

[0077] S3.2, bind constraints to the interference fit interface.

[0078] For example, the fit between the bearing and the shaft or the bearing and the bearing support, the fit between the bearing frame and the housing, the fit between the housing and the cantilever, etc.

[0079] S3.3, define contact constraints for the gear meshing surfaces and bearing clearance fit interfaces.

[0080] Contact constraints are defined for the clearance fit interface of the gear meshing surface and the bearing. The bearing needs to define normal behavior, while the gear meshing is a sliding-rolling motion, so both tangential and normal behaviors need to be defined.

[0081] S3.4, couple the small wheel axle and the large wheel axle, constrain their motion and eliminate tooth surface constraints.

[0082] The purpose of this step is to ensure that the gear pair meshes normally during calculation.

[0083] S4, load the vehicle-bridge system assembly model after constraint processing according to working conditions, and use finite element software to solve the stress and strain of the vehicle-bridge system assembly model.

[0084] The purpose of this step is to calculate and assemble the overall assembly stiffness matrix of the system and to balance and solve the forces and deformations through partial differential equations.

[0085] Specifically, the passive wheel is loaded according to the working conditions, and finally the stress and strain of the CAE model is solved based on the load, motion constraint and assembly mesh model, wherein the solution of the system model can be completed using finite element software.

[0086] S5, calculating the meshing position misalignment of the hypoid gear under the corresponding load condition according to the solved stress and strain.

[0087] The purpose of this step is to determine the misalignment based on the load spectrum by using the system deformation and the conversion method based on the gear meshing position misalignment. The misalignment includes the axis angle error, the offset distance error, the small wheel axis error, and the large wheel axial error.

[0088] The specific conversion method is as follows.

[0089] S5.1, for the large wheel and the small wheel, select three points on a certain circumference to determine a circle, use these three points to determine the gear axis, and express the spatial position characteristics of the large wheel and the small wheel.

[0090] like Figure 3 As shown in the figure, the spatial position features include the center position of the circle, the normal vector of the circular plane, the axis angle between the large wheel and the small wheel, the offset distance between the large wheel and the small wheel, and the distance from the center of the circle to the axis intersection. G P , G G They represent the small axle and the large axle respectively.

[0091] First, select three points to determine a circle, and try to avoid the constraint surface. You can select three points on the circumference of the large and small wheels close to the large end of the gear blank.

[0092] S5.2, extract the coordinates of each point before and after the load is applied.

[0093] After the axle system is loaded, the system deforms, which results in misalignment. The displacement and deformation of each selected point are output, and the coordinates and deformation of the model before and after the load is loaded are extracted.

[0094] S5.3, obtain the spatial position characteristics of the large wheel and the small wheel before and after the load is applied based on the coordinates of the corresponding points.

[0095] S5.4, calculate the meshing position misalignment of the hypoid gear under the corresponding load condition based on the spatial position characteristics before and after the load is applied.

[0096] A circle is determined by three points in space, and its axis is used to express the position characteristics of the large wheel and the small wheel. The axis angle error Δ of the cycloid hypoid gear under a certain load is determined by calculating the angle error, offset error, and error of the distance from the center of the circle to the intersection of the axis before and after loading. α , offset error Δ E , small wheel axis error Δ P 、Axial error of large wheel Δ G , which is the misalignment based on gear meshing.

[0097] S5.4.1, calculate the distance from the new center of the circle to the axis intersection after the load is applied using the following formula (1):

[0098] (1)

[0099] in, R P , R G are the center positions of the small wheel and the large wheel after loading, , are the normal vectors of the circumferential plane of the small wheel and the large wheel after the load is applied, 、 They are the distances from the center of the small wheel and the large wheel to the intersection of the axes after the load is applied.

[0100] S5.4.2, calculate the meshing position misalignment of the hypoid gear under the corresponding load condition using the following formula (2):

[0101] (2)

[0102] Among them, Δ E、 Δ P、 Δ G、 Δ α They are offset distance error, small wheel axis error, large wheel axis error, and axis angle error. E.L P 、L G 、α They are the offset distance before loading, the distance from the center of the small wheel to the intersection of the axes, the distance from the center of the large wheel to the intersection of the axes, and the axis angle.

[0103] Based on the misalignment obtained above, according to the misalignment of the gears under different loads, the position of the gear contact mark is optimized based on the principle of pre-compensation of the contact mark offset direction. That is, the system deformation caused by loading causes the large wheel contact mark to shift toward the tooth top. In the design stage, the contact mark should be close to the tooth root to avoid tooth top contact under heavy load conditions, which causes stress concentration and reduces the reliability of components. The gear pair can still ensure good meshing performance under heavy load conditions, so as to achieve the tolerance design of cycloid equi-height hypoid gears.

[0104] An embodiment of a method for calculating the misalignment of a quasi-hypoid gear system is described in detail above. Based on the method for calculating the misalignment of a quasi-hypoid gear system described in the above embodiment, an embodiment of the present invention also provides a device for calculating the misalignment of a quasi-hypoid gear system corresponding to the method.

[0105] Figure 4 is a schematic block diagram of the structure of a hypoid gear system-level misalignment calculation device provided by an embodiment of the present invention. In this embodiment, the hypoid gear system-level misalignment calculation device 400 can be divided into multiple functional modules according to the functions it performs, such as Figure 4 The functional modules may include: a model building module 410, a pre-processing module 420, a constraint processing module 430, a load loading module 440, and a misalignment calculation module 450. The module referred to in the present invention refers to a series of computer program segments that can be executed by at least one processor and can complete fixed functions, which are stored in a memory.

[0106] Model building module 410: building a vehicle-axle system assembly model.

[0107] Pre-processing module 420: pre-processing the axle system assembly model for finite element analysis.

[0108] The constraint processing module 430 performs constraint processing on the axle system assembly model after pre-processing.

[0109] Load loading module 440: Load the vehicle-bridge system assembly model after constraint processing according to working conditions, and solve the stress and strain of the vehicle-bridge system assembly model using finite element software.

[0110] Misalignment calculation module 450: Calculates the meshing position misalignment of the hypoid gear under the corresponding load condition according to the solved stress and strain.

[0111] The device for calculating the misalignment of a hypoid gear system of the present embodiment is used to implement the aforementioned method for calculating the misalignment of a hypoid gear system. Therefore, the specific implementation of the device can be seen in the embodiment section of the method for calculating the misalignment of a hypoid gear system in the preceding text. Therefore, its specific implementation can refer to the description of the corresponding embodiments of each part and will not be elaborated here.

[0112] In addition, since the hypoid gear system misalignment calculation device of this embodiment is used to implement the aforementioned hypoid gear system misalignment calculation method, its function corresponds to that of the aforementioned method and will not be repeated here.

[0113] Figure 5 A schematic diagram of the structure of a terminal 500 provided in an embodiment of the present invention includes: a processor 510, a memory 520 and a communication unit 530. The processor 510 is used to implement the following steps when implementing the hypoid gear system-level misalignment calculation program stored in the memory 520:

[0114] Construct the axle system assembly model;

[0115] Pre-processing of the axle system assembly model for finite element analysis;

[0116] Perform constraint processing on the axle system assembly model after pre-processing;

[0117] Load the axle system assembly model after constraint processing according to the working conditions, and use finite element software to solve the stress and strain of the axle system assembly model;

[0118] The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated based on the solved stress and strain.

[0119] The terminal 500 includes a processor 510, a memory 520 and a communication unit 530. These components communicate via one or more buses. It will be appreciated by those skilled in the art that the server structure shown in the figure does not limit the present invention, and it may be a bus structure or a star structure, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0120] The memory 520 can be used to store the execution instructions of the processor 510, and the memory 520 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. When the execution instructions in the memory 520 are executed by the processor 510, the terminal 500 can execute some or all of the steps in the following method embodiments.

[0121] The processor 510 is the control center of the storage terminal, and uses various interfaces and lines to connect various parts of the entire electronic terminal. It runs or executes software programs and / or modules stored in the memory 520, and calls data stored in the memory to perform various functions of the electronic terminal and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 510 can only include a central processing unit (CPU). In the embodiment of the present invention, the CPU can be a single computing core or multiple computing cores.

[0122] The communication unit 530 is used to establish a communication channel so that the storage terminal can communicate with other terminals, receive user data sent by other terminals or send user data to other terminals.

[0123] The present invention also provides a computer storage medium, wherein the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0124] The computer storage medium stores a hypoid gear system-level misalignment calculation program, and when the hypoid gear system-level misalignment calculation program is executed by a processor, the following steps are implemented:

[0125] Construct the axle system assembly model;

[0126] Pre-processing of the axle system assembly model for finite element analysis;

[0127] Perform constraint processing on the axle system assembly model after pre-processing;

[0128] Load the axle system assembly model after constraint processing according to the working conditions, and use finite element software to solve the stress and strain of the axle system assembly model;

[0129] The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated based on the solved stress and strain.

[0130] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes, including several instructions for enabling a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention.

[0131] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0132] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0134] The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by a person skilled in the art, as well as several improvements and modifications made without departing from the principle of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for calculating the misalignment of a hypoid gear system, characterized in that: The following steps are involved: Construct the axle system assembly model; Pre-processing of the axle system assembly model for finite element analysis; Perform constraint processing on the axle system assembly model after pre-processing; Load the axle system assembly model after constraint processing according to the working conditions, and use finite element software to solve the stress and strain of the axle system assembly model; Calculate the meshing position misalignment of the hypoid gear under the corresponding load condition based on the solved stress and strain, including selecting three points on a certain circumference to determine a circle for the large wheel and the small wheel, using these three points to determine the gear axis, and expressing the spatial position characteristics of the large wheel and the small wheel, including the center position of the circle, the normal vector of the circular plane, the shaft angle between the large wheel and the small wheel, the offset distance between the large wheel and the small wheel, and the distance from the center of the circle to the intersection of the axes; extract the coordinates of each point before and after the load is applied; obtain the spatial position characteristics of the large wheel and the small wheel before and after the load is applied based on the coordinates of the corresponding points; The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated according to the spatial position characteristics before and after the load is applied, including: The distance from the new center of the circle to the axis intersection after the load is applied is calculated using the following formula (1): （1） in, R P , R G are the center positions of the small wheel and the large wheel after loading, , are the normal vectors of the circumferential plane of the small wheel and the large wheel after the load is applied, 、 are the distances from the center of the small wheel and the large wheel to the intersection of the axes after the load is applied; The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated by the following formula (2): （2） Among them, Δ E、 Δ P、 Δ G、 Δ α They are offset distance error, small wheel axis error, large wheel axis error, and axis angle error. E.L P 、L G 、α They are the offset distance before loading, the distance from the center of the small wheel to the intersection of the axes, the distance from the center of the large wheel to the intersection of the axes, and the axis angle.

2. The method for calculating the misalignment of a hypoid gear system according to claim 1, characterized in that: Construct the axle system assembly model, including: Delete the modeling of bolts and screws, and replace them with binding constraints; The bearing is simplified by using the interference method between rolling elements and inner and outer rings.

3. The method for calculating the misalignment of a hypoid gear system according to claim 2, characterized in that: The pre-processing of the finite element analysis of the axle system assembly model includes: Perform tetrahedral meshing on target parts; Optimize the meshes with aspect ratio less than the threshold; Hide unimportant feature lines.

4. The method for calculating the misalignment of a hypoid gear system according to claim 3, characterized in that: Optimize the meshes with aspect ratio less than the threshold, including: For meshes whose aspect ratio is less than the threshold, gap merging and node merging are performed.

5. The method for calculating the misalignment of a hypoid gear system according to claim 4, characterized in that: The axle system assembly model after pre-processing is constrained, including: Assemble the components and rotate the large wheel to make the tooth surfaces of the large wheel and the small wheel interfere with each other; Bind constraints to the interference fit interface; Define contact constraints for gear meshing surfaces and bearing clearance fit interfaces; The small wheel axle and the large wheel axle are coupled to constrain their motion and eliminate tooth surface constraints.

6. A hypoid gear system-level misalignment calculation device, characterized in that: include, Model building module: build the axle system assembly model; Pre-processing module: pre-processing of the axle system assembly model for finite element analysis; Constraint processing module: performs constraint processing on the axle system assembly model after pre-processing; Load loading module: Load the axle system assembly model after constraint processing according to the working conditions, and use finite element software to solve the stress and strain of the axle system assembly model; Misalignment calculation module: Calculate the meshing position misalignment of the hypoid gear under the corresponding load condition according to the solved stress and strain, including selecting three points on a certain circumference to determine a circle for the large wheel and the small wheel, using these three points to determine the gear axis, and expressing the spatial position characteristics of the large wheel and the small wheel, including the center position of the circle, the normal vector of the circular plane, the shaft angle between the large wheel and the small wheel, the offset distance between the large wheel and the small wheel, and the distance from the center of the circle to the intersection of the axes; extract the coordinates of each point before and after the load is loaded; obtain the spatial position characteristics of the large wheel and the small wheel before and after the load is loaded based on the coordinates of the corresponding points; The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated according to the spatial position characteristics before and after the load is applied, including: The distance from the new center of the circle to the axis intersection after the load is applied is calculated using the following formula (1): （1） in, R P 、R G are the center positions of the small wheel and the large wheel after loading, , are the normal vectors of the circumferential plane of the small wheel and the large wheel after the load is applied, , are the distances from the center of the small wheel and the large wheel to the intersection of the axes after the load is applied; The meshing position misalignment of the hypoid gear under the corresponding load condition is calculated by the following formula (2): （2） Among them, Δ E , Δ P , Δ G , Δ α They are offset distance error, small wheel axis error, large wheel axis error, and axis angle error. E.L P 、L G 、α They are the offset distance before loading, the distance from the center of the small wheel to the intersection of the axes, the distance from the center of the large wheel to the intersection of the axes, and the axis angle.

7. A terminal, characterized in that: include: A memory for storing a hypoid gear system-level misalignment calculation program; A processor, for implementing the steps of the method for calculating the system-level misalignment of a hypoid gear as described in any one of claims 1 to 5 when executing the program for calculating the system-level misalignment of a hypoid gear.

8. A computer-readable storage medium, characterized in that: The readable storage medium stores a program for calculating the misalignment of a hypoid gear system. When the program for calculating the misalignment of a hypoid gear system is executed by a processor, the steps of the method for calculating the misalignment of a hypoid gear system as described in any one of claims 1 to 5 are implemented.

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