A transmission shift hub drive durability reliability evaluation system and method

Abstract

This invention discloses a press-fit reliability evaluation system for a transmission shift hub. The system includes a shift hub shift drive finite element modeling module, a shift hub drive operating condition strength calculation module, a shift material strength evaluation module, and a shift hub groove fatigue calculation module. Based on the shift hub shift drive model, the system simulates the shift hub's shifting operating conditions, effectively ensuring a rational design for the shift hub's shift drive operating conditions and improving powertrain development efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of design and simulation of a shifting mechanism of an automobile transmission, and in particular to a drive durability reliability evaluation system and method for a transmission shift hub. Background Art

[0002] The shift hub is an important component of the automobile transmission's gear selection and shifting actuator. As the core component for realizing the gear shifting function, the motor drives the shift hub to rotate, which can drive the shift fork to shift horizontally along the axis, thereby realizing the gear change. The shift hub structure itself needs to bear a certain load in normal working state. The main parts are the shift hub groove, the shift hub stop point, and the shift hub pin shaft.

[0003] Due to the complex shifting logic and the diverse operating conditions and stresses of the shift hub, stringent requirements are placed on the shift hub's structural safety and durability. Failure of the shift hub structure can lead to partial functional loss, significantly impacting the vehicle's lifecycle. Therefore, simulation and optimization of mechanical properties, such as the shift hub's structural strength and durability, are integrated into all levels of testing, from component design to transmission and vehicle design, and have become an integral part of every design phase.

[0004] The durability of the shift hub determines its lifespan and is also one of the important indicators to ensure the reliability of the shift hub. Therefore, how to predict problems in advance during the design stage to reduce risks and ensure the driving durability and reliability of the shift hub has become an urgent need in both traditional and new energy transmission fields. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a transmission shift hub drive durability reliability evaluation system and method.

[0006] To achieve this purpose, the transmission shift hub drive durability reliability evaluation system designed by the present invention includes a shift hub shift drive finite element model establishment module, a shift hub drive working condition strength calculation module, a shift material strength evaluation module and a shift hub groove fatigue calculation module; the shift hub shift drive finite element model establishment module is used to establish a shift hub shift drive model; the shift hub drive working condition strength calculation module is used to calculate the shift hub drive shift working condition stress value in the two driving directions of the shift hub groove under the actual drive shift working condition according to the shift hub shift drive model; the shift hub drive working condition strength calculation module is used to calculate the shift hub drive shift working condition stress value in the two driving directions of the shift hub groove under the actual drive shift working condition The material strength evaluation module is used to evaluate whether the structural design of each part of the shift hub shift drive model is qualified based on the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and the actual drive shift working condition; the shift hub groove fatigue calculation module is used to simulate the time-varying stress change history of the shift hub groove under the actual drive shift working condition based on the shift hub shift drive model and the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and the actual drive shift working condition, and predict the fatigue life of the shift hub groove under the corresponding load in combination with the fatigue criterion.

[0007] Furthermore, establishing the shift hub shift drive model includes establishing a three-dimensional geometric model of the shift hub drive slider, a three-dimensional geometric model of the shift hub shell, a three-dimensional geometric model of the shift hub pin shaft, a three-dimensional geometric model of the shift hub bushing, a three-dimensional geometric model of the shift hub double gear, a three-dimensional geometric model of the shift hub connecting bolt, and a shift hub shift drive model formed by assembling the three-dimensional geometric model of the shift hub drive slider, the three-dimensional geometric model of the shift hub shell, the three-dimensional geometric model of the shift hub pin shaft, the three-dimensional geometric model of the shift hub bushing, the three-dimensional geometric model of the shift hub double gear and the three-dimensional geometric model of the shift hub connecting bolt.

[0008] Furthermore, establishing the shift hub shift drive model includes setting material properties of the shift hub drive slider, the shift hub housing, the shift hub pin, the shift hub bushing, the shift hub duplex gear and the shift hub connecting bolt.

[0009] The driving durability reliability evaluation method of the transmission shift hub based on the driving durability reliability evaluation system of the transmission shift hub described above includes establishing a shift hub shift drive model; calculating the shift hub drive shift condition stress values ​​in the two driving directions of the shift hub groove under the actual drive shift condition according to the shift hub shift drive model; evaluating whether the structural designs of various parts of the shift hub shift drive model are qualified according to the shift hub drive shift condition stress values ​​in the two driving directions of the shift hub groove under the actual drive shift condition; simulating the time-varying stress change history of the shift hub groove under the actual drive shift condition according to the shift hub shift drive model and the shift hub drive shift condition stress values ​​in the two driving directions of the shift hub groove under the actual drive shift condition, and predicting the fatigue life of the shift hub groove under the corresponding load in combination with the fatigue criterion.

[0010] Furthermore, the method for establishing the shift hub shift drive model includes: establishing a three-dimensional geometric model of the shift hub drive slider, a three-dimensional geometric model of the shift hub shell, a three-dimensional geometric model of the shift hub pin shaft, a three-dimensional geometric model of the shift hub bushing, a three-dimensional geometric model of the shift hub double gear, and a three-dimensional geometric model of the shift hub connecting bolt; according to the constraint relationship between the shift hub drive slider, the shift hub shell, the shift hub pin shaft, the shift hub bushing, the shift hub double gear and the shift hub connecting bolt, the three-dimensional geometric model of the shift hub drive slider, the three-dimensional geometric model of the shift hub shell, the three-dimensional geometric model of the shift hub pin shaft, the three-dimensional geometric model of the shift hub bushing, the three-dimensional geometric model of the shift hub double gear and the three-dimensional geometric model of the shift hub connecting bolt are assembled to form the shift hub shift drive model.

[0011] Furthermore, the method for establishing the shift hub shift drive model includes: meshing the shift hub shift drive model, setting the material properties of the shift hub drive slider, shift hub housing, shift hub pin shaft, shift hub bushing, shift hub duplex gear and shift hub connecting bolt, etc.

[0012] Furthermore, the method for establishing the shift hub shift drive model includes: setting the connection relationship between the shift hub drive slider, shift hub housing, shift hub pin shaft, shift hub bushing, shift hub double gear and shift hub connecting bolt; establishing the load transfer relationship between the shift hub drive slider, shift hub housing, shift hub pin shaft, shift hub bushing, shift hub double gear and shift hub connecting bolt; and loading torque load on the shift hub double gear.

[0013] Furthermore, the method for calculating the shift hub drive shift condition stress values ​​in the two driving directions of the shift hub groove under the actual drive shift condition based on the shift hub shift drive model includes: setting the boundary conditions of the shift hub shift drive model and applying loads, iteratively calculating the shift hub shift drive model under the reference torque, respectively obtaining stress distribution results of the drive shift condition in the two directions, post-processing the stress distribution results of the drive shift condition in the two directions, and extracting the shift hub drive shift condition stress values ​​in the two driving directions under the actual drive shift condition.

[0014] Furthermore, a method for evaluating whether the structural designs of various parts of the shift hub shift drive model are qualified based on the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and under the actual drive shift working conditions includes: using the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and under the actual drive shift working conditions as evaluation inputs; if the material strength calculations of the structural designs of various parts of the shift hub shift drive model meet the requirements, the structural design of the shift hub shift drive model is qualified; otherwise, the structural design of the shift hub shift drive model is unqualified.

[0015] Furthermore, based on the shift hub shift drive model and the shift hub groove's stress values ​​in the two driving directions and under the actual drive shift conditions, the time-varying stress change history of the shift hub groove under the actual drive shift conditions is simulated, and combined with the fatigue criterion, the method for predicting the fatigue life of the shift hub groove under the corresponding load includes: importing the mesh file of the shift hub shell into fatigue simulation software, importing the stress distribution results of the shift hub shell corresponding to the reference torque, setting the stress channels and cyclic conditions corresponding to each torque condition in the two driving directions of the shift hub, finding the maximum equivalent stress of each node of the shift hub for each torque, selecting the shift hub fatigue simulation influencing factor according to the load history of the load spectrum matrix of the shift hub durability test condition, calculating the fatigue cumulative damage of the shift hub based on the fatigue criterion, outputting the fatigue results of the shift hub groove, and judging the fatigue life of the shift hub groove.

[0016] The beneficial effects of the present invention are as follows: based on the shift hub shift drive model, the present invention simulates the shift hub drive shifting working conditions, effectively ensures the reasonable design of the shift hub shift drive working conditions, and improves the efficiency of powertrain development. When analyzing the shift hub shift reliability during the simulation process, the present invention accurately constructs the shift hub drive shift model, combines the actual use conditions of the vehicle, and considers the influence of conventional drive conditions on the shift hub shift drive of the design, assembly process, actual road use, etc., so that the shift hub shift drive obtained has high reliability and is not prone to failure. Through a reasonable simplified model, in line with the actual boundary setting and load distribution setting, it can not only correctly represent the relationship between the various components of the two-speed transmission shift hub when working, but also can realistically simulate the shift stress conditions of the shift hub, thereby improving the accuracy of the finite element strength analysis of the transmission shift hub, improving the analysis efficiency, and further accurately predicting the fatigue life of the shift structure. The disclosure of this calculation method has positive significance for improving the technical level of the transmission shift hub in traditional and new energy industries. When analyzing the reliability of the shift hub assembly during the simulation process, the present invention uses the stress distribution of the shift hub shell obtained through simulation to perform all-round and multi-angle iterative optimization of the shift hub shell. The boundary conditions are consistent with the actual working conditions, and the stress conditions of the shift hub shift assembly are more in line with reality. The simulation and test results can better meet the reliability requirements of the shift hub shift assembly in actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a module connection diagram of the transmission shift hub drive durability reliability evaluation system of the present invention;

[0018] Figure 2 This is a three-dimensional diagram of the connection assembly between the shift hub and the motor in the present invention;

[0019] Figure 3 A three-dimensional diagram of the shift hub shift drive model of the present invention;

[0020] 201 - Shift hub shift drive finite element model establishment module, 202 - Shift hub drive working condition strength calculation module, 203 - Shift material strength evaluation module, 204 - Shift hub groove fatigue calculation module;

[0021] 401 - shift hub housing, 402 - shift hub pin, 403 - shift hub drive slider, 404 - shift hub bushing, 405 - shift hub duplex gear, 406 - shift hub connecting bolt, 407 - transmission housing, 408 - shift hub top dead center, 409 - shift hub bottom dead center,

[0022] 501—shift motor, 502—first duplex gear, 503—first duplex gear positioning pin, 504—second duplex gear, 505—second duplex gear positioning pin. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0024] Figure 1 The transmission shift hub drive durability reliability evaluation system designed for the present invention includes a shift hub shift drive finite element model establishment module 201, a shift hub drive working condition strength calculation module 202, a shift material strength evaluation module 203 and a shift hub groove fatigue calculation module 204.

[0025] The shift hub shift drive finite element model establishment module 201 is used to establish the shift hub shift drive model; the shift hub drive working condition strength calculation module 202 is used to calculate the shift hub drive shift working condition stress values ​​of the shift hub groove in the two driving directions and under the actual drive shift working condition based on the shift hub shift drive model; the shift material strength evaluation module 203 is used to evaluate whether the structural design of each part of the shift hub shift drive model is qualified based on the shift hub drive shift working condition stress values ​​of the shift hub groove in the two driving directions and under the actual drive shift working condition; the shift hub groove fatigue calculation module 204 is used to simulate the time-varying stress change history of the shift hub groove under the actual drive shift working condition based on the shift hub shift drive model and the shift hub drive shift working condition stress values ​​of the shift hub groove in the two driving directions and under the actual drive shift working condition, and predict the fatigue life of the shift hub groove under the corresponding load in combination with the fatigue criterion.

[0026] like Figure 2 As shown in FIG3 , the method for establishing the shift hub shift drive model is:

[0027] According to the basic principle of the shift motor 501 driving the shift hub, within a limited structural space, the shift motor 501 is decelerated and torque increased through a double gear pair, and the rotational motion of the shift motor 501 is converted into the linear motion of the shift fork (the shift fork is bound to the shift hub drive slider 403, and when the shift motor 501 drives the shift hub housing 401 to rotate, the shift hub drive slider 403 moves in the shift hub groove, driving the shift fork to move linearly). The gear arrangement is performed according to the system functional requirements, that is, the initial design of the shift hub groove.

[0028] According to the structure of the shift hub drive assembly, three-dimensional models of components such as the shift hub drive slider 403, the shift hub housing 401, and the shift hub pin 402 are established respectively. The various components are assembled into an assembly model according to the analysis requirements. Two assembly geometric models are established for the two different driving directions of the same shift hub groove respectively, paving the way for finite element modeling.

[0029] A 10-node tetrahedral quadratic solid element is used to mesh the shift hub drive slider 403, the shift hub housing 401, the shift hub double gear 405 and the shift hub connecting bolt 406, the shift hub pin 402, and the shift hub bushing 404. The mesh nodes are one-to-one corresponding to each other between the shift hub housing 401 and the shift hub pin 402, between the shift hub double gear 405 and the shift hub housing 401, and between the shift hub bushing 404 and the shift hub pin 402.

[0030] A contact relationship is set between each component to transfer the load, for example: the radial contact surface of the shift hub bushing 404 and the shift hub shell 401 is set to be frictionless contact; the shift hub shell 401 and the shift hub double gear 405, the bottom of the bolt head of the shift hub connecting bolt 406 and the shift hub double gear 405 are all set to be frictionless binding contact, the shift hub shell 401, the shift hub double gear 405 and the shift hub connecting bolt 406 threads are all set to be binding, the shift hub double gear 405 and the shift hub shell There is frictionless contact between the bodies 401, frictionless contact is set between the inner ring of the shift hub bushing 404 and the outer ring of the shift hub pin shaft 402, the shift hub pin shaft 402 and the shift hub housing 401 are set to be in binding contact, the same inspection point of the shift hub groove corresponds to the assembly digital model of the two driving directions, and the two contact surfaces of the shift hub groove and the shift hub drive sliders 403 at two different positions are set to frictionless contact. When it is assumed that there is frictionless contact, the shift hub shift drive working condition has the most stringent inspection on the shift hub groove.

[0031] The load relationship is processed according to the working principle of the shift hub shift drive condition. Without considering the friction loss, the torque type is divided into four categories, namely misoperation torque, high load torque, medium load torque, and low load torque. The same torque type acts in two driving directions to assess the static strength of the shift hub groove, while paving the way for the subsequent shift hub shift drive condition durability test.

[0032] According to the actual working characteristics of the shift hub shifting, the loading is divided into three steps: the first step is to load the physical bolt preload, and apply preload force to the shift hub double gear 405 and the shift hub connecting bolt 406; the second step is to fix the physical bolt preload length, and fix the preload length of the shift hub double gear 405 and the shift hub connecting bolt 406; the third step is the loading step, and the corresponding torque load is applied to the shift hub double gear 405 according to the actual assembly boundary.

[0033] The method for calculating the stress value of the shift hub drive shift condition under the actual drive shift condition in the two driving directions of the shift hub groove according to the shift hub shift drive model is:

[0034] Iterative calculation is performed on the finite element model of the shift hub drive shifting condition under two types of benchmark torques.

[0035] The method for evaluating whether the structural design of each part of the shift hub shift drive model is qualified based on the shift hub drive shift stress value under the actual drive shift working condition in the two driving directions of the shift hub groove is:

[0036] The resulting stress value of the actual shift hub shift drive working condition is used as the evaluation input. If the component is initially made of linear material, the static overload safety factor is evaluated. If the strength calculation result meets the requirements, the next step is carried out; otherwise, the structural parameters of the component are optimized and adjusted.

[0037] If the component is initially made of plastic material, the resulting stress value from the actual shift hub shift drive condition is compared with the material yield strength. If the strength calculation result meets the requirements, proceed to the next step; otherwise, the structural parameters of the component are optimized and adjusted.

[0038] Based on the shift hub shift drive model and the shift hub groove's stress values ​​in the two driving directions and under actual shifting conditions, the time-varying stress change history of the shift hub groove under actual shifting conditions is simulated. Combined with the fatigue criterion, the fatigue life of the shift hub groove under corresponding loads is predicted using the following method:

[0039] According to the shift hub shift drive model and the shift hub groove's stress values ​​in the two driving directions and under the actual drive shift conditions, the time-varying stress change history of the shift hub groove under the actual drive shift conditions is simulated, and combined with the fatigue criterion, the method for predicting the fatigue life of the shift hub groove under the corresponding load includes: importing the mesh file of the shift hub shell 401 into fatigue simulation software, importing the stress distribution result of the shift hub shell 401 corresponding to the reference torque, setting the stress channels and cyclic conditions corresponding to each torque condition in the two driving directions of the shift hub, finding the maximum equivalent stress of each node of the shift hub for each torque, selecting the shift hub fatigue simulation influencing factor according to the load history of the load spectrum matrix of the shift hub durability test condition, calculating the fatigue cumulative damage of the shift hub based on the fatigue criterion, outputting the fatigue result of the shift hub groove, and judging the fatigue life of the shift hub groove.

[0040] After completing the above operations, a durability test of the shift hub's shift drive working condition is carried out. If the shift hub's shift drive durability test results meet the requirements, the shift hub's drive durability reliability is qualified; otherwise, the structural parameters of the shift hub's shift drive model are optimized and adjusted.

[0041] In summary, the present invention simulates the working conditions of the shift hub drive shifting based on the shift hub shift drive model, effectively ensuring the reasonable design of the shift hub shift drive working conditions and improving the efficiency of powertrain development. When analyzing the shift hub's shift reliability during the simulation process, the present invention accurately constructs the shift hub drive shift model, combines the actual use conditions of the vehicle, and considers the impact of conventional drive conditions on the shift hub shift drive of the design, assembly process, actual road use, etc., so that the obtained shift hub has high reliability and is not prone to failure. Through a reasonable simplified model, in line with the actual boundary setting and load distribution setting, it can not only correctly represent the relationship between the various components of the two-speed transmission shift hub when working, but also can realistically simulate the shift stress conditions of the shift hub, improve the accuracy of the finite element strength analysis of the transmission shift hub, improve the analysis efficiency, and further accurately predict the fatigue life of the shift structure. The disclosure of this calculation method has positive significance for improving the technical level of the transmission shift hub in traditional and new energy industries. When analyzing the reliability of the shift hub assembly during the simulation process, the present invention can perform all-round and multi-angle iterative optimization of the shift hub through the stress distribution of the shift hub obtained through simulation. The boundary conditions are consistent with the actual working conditions, and the stress conditions of the shift hub shift assembly are more in line with reality. The simulation and test results can better meet the reliability requirements of the shift hub shift assembly in actual use.

[0042] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and is susceptible to numerous variations. Any simple modifications, equivalent variations, and modifications to the above embodiments based on the technical essence of the present invention shall be deemed to fall within the scope of protection of the present invention.

Claims

1. A transmission shift hub drive durability reliability evaluation system, characterized by: It includes a shift hub shift drive finite element model establishment module (201), a shift hub drive working condition strength calculation module (202), a shift material strength evaluation module (203) and a shift hub groove fatigue calculation module (204); The shift hub shift drive finite element model establishment module (201) is used to establish a shift hub shift drive model; The shift hub driving working condition strength calculation module (202) is used to calculate the shift hub driving shift working condition stress value in two driving directions of the shift hub groove under the actual driving shift working condition according to the shift hub shift driving model; The shift material strength evaluation module (203) is used to evaluate whether the structural design of each part of the shift hub shift drive model is qualified based on the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and under the actual driving shift working condition; The shift hub groove fatigue calculation module (204) is used to simulate the time-varying stress change history of the shift hub groove under the actual driving shift condition based on the shift hub shift driving model and the shift hub groove's driving shift condition stress values ​​in two driving directions under the actual driving shift condition, and predict the fatigue life of the shift hub groove under the corresponding load in combination with the fatigue criterion.

2. The transmission shift hub drive durability reliability evaluation system according to claim 1, wherein: Establishing the shift hub shift drive model includes establishing a three-dimensional geometric model of a shift hub drive slider (403), a three-dimensional geometric model of a shift hub housing (401), a three-dimensional geometric model of a shift hub pin shaft (402), a three-dimensional geometric model of a shift hub bushing (404), a three-dimensional geometric model of a shift hub double gear (405), a three-dimensional geometric model of a shift hub connecting bolt (406), and a shift hub shift drive model formed by assembling the three-dimensional geometric model of the shift hub drive slider (403), the three-dimensional geometric model of the shift hub housing (401), the three-dimensional geometric model of the shift hub pin shaft (402), the three-dimensional geometric model of the shift hub bushing (404), the three-dimensional geometric model of the shift hub double gear (405) and the three-dimensional geometric model of the shift hub connecting bolt (406).

3. The transmission shift hub drive durability reliability evaluation system according to claim 1, wherein: Establishing the shift hub shift drive model includes setting the material properties of the shift hub drive slider (403), the shift hub housing (401), the shift hub pin (402), the shift hub bushing (404), the shift hub duplex gear (405) and the shift hub connecting bolt (406).

4. A method for evaluating the driving durability reliability of a transmission shift hub based on the driving durability reliability evaluation system of the transmission shift hub according to any one of claims 1 to 3, characterized in that: The method includes establishing a shift hub shift driving model; calculating the shift hub drive shift working condition stress value under the actual drive shift working condition in two driving directions of the shift hub groove according to the shift hub shift driving model; Evaluate whether the structural design of each part of the shift hub shift drive model is qualified according to the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and under the actual driving shift working condition; Based on the shift hub shift drive model and the shift hub driving shift stress values ​​in the two driving directions of the shift hub groove under the actual driving shift conditions, the time-varying stress change history of the shift hub groove under the actual driving shift conditions is simulated, and combined with the fatigue criterion, the fatigue life of the shift hub groove under the corresponding load is predicted.

5. The method for evaluating the driving durability reliability of a transmission shift hub according to claim 4, wherein: The method for establishing the shift hub shift drive model comprises: establishing a three-dimensional geometric model of a shift hub drive slider (403), a three-dimensional geometric model of a shift hub shell (401), a three-dimensional geometric model of a shift hub pin shaft (402), a three-dimensional geometric model of a shift hub bushing (404), a three-dimensional geometric model of a shift hub double gear (405), and a three-dimensional geometric model of a shift hub connecting bolt (406); and establishing a three-dimensional geometric model of a shift hub drive slider (403), a three-dimensional geometric model of a shift hub shell (401), a three-dimensional geometric model of a shift hub pin shaft (402), a three-dimensional geometric model of a shift hub bushing (404), a three-dimensional geometric model of a shift hub double gear (405), and a three-dimensional geometric model of a shift hub connecting bolt (406). , the shift hub bushing (404), the shift hub double gear (405) and the shift hub connecting bolt (406), and assemble the three-dimensional geometric model of the shift hub driving slider (403), the three-dimensional geometric model of the shift hub housing (401), the three-dimensional geometric model of the shift hub pin (402), the three-dimensional geometric model of the shift hub bushing (404), the three-dimensional geometric model of the shift hub double gear (405) and the three-dimensional geometric model of the shift hub connecting bolt (406) to form a shift hub shift drive model.

6. The method for evaluating the driving durability reliability of a transmission shift hub according to claim 5, wherein: The method for establishing the shift hub shift drive model comprises: meshing the shift hub shift drive model, and setting material properties of the shift hub drive slider (403), the shift hub housing (401), the shift hub pin (402), the shift hub bushing (404), the shift hub duplex gear (405), and the shift hub connecting bolt (406).

7. The method for evaluating the driving durability reliability of a transmission shift hub according to claim 6, wherein: The method for establishing the shift hub shift drive model comprises: setting a connection relationship among the shift hub drive slider (403), the shift hub housing (401), the shift hub pin shaft (402), the shift hub bushing (404), the shift hub double gear (405) and the shift hub connecting bolt (406); establishing a load transfer relationship among the shift hub drive slider (403), the shift hub housing (401), the shift hub pin shaft (402), the shift hub bushing (404), the shift hub double gear (405) and the shift hub connecting bolt (406); and applying a torque load to the shift hub double gear (405).

8. The method for evaluating the driving durability reliability of a transmission shift hub according to claim 7, wherein: The method for calculating the shift hub drive shift condition stress values ​​in the two driving directions of the shift hub groove under the actual drive shift condition based on the shift hub shift drive model includes: setting the boundary conditions of the shift hub shift drive model and applying loads, iteratively calculating the shift hub shift drive model under the reference torque to obtain stress distribution results of the drive shift condition in the two directions respectively, post-processing the stress distribution results of the drive shift condition in the two directions, and extracting the shift hub drive shift condition stress values ​​in the two driving directions under the actual drive shift condition.

9. The method for evaluating the driving durability reliability of a transmission shift hub according to claim 8, wherein: A method for evaluating whether the structural designs of various parts of a shift hub shift drive model are qualified based on the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and under the actual drive shift working conditions includes: using the shift hub drive shift working condition stress values ​​in the two driving directions of the shift hub groove and under the actual drive shift working conditions as evaluation inputs; if the material strength calculations of the structural designs of various parts of the shift hub shift drive model meet the requirements, the structural design of the shift hub shift drive model is qualified; otherwise, the structural design of the shift hub shift drive model is unqualified.

10. The method for evaluating the driving durability reliability of a transmission shift hub according to claim 8, wherein: According to the shift hub shift drive model and the shift hub groove's shift hub drive shift condition stress values ​​in the two driving directions and under the actual drive shift condition, the time-varying stress change history of the shift hub groove under the actual drive shift condition is simulated, and combined with the fatigue criterion, the method for predicting the fatigue life of the shift hub groove under the corresponding load includes: importing the mesh file of the shift hub shell (401) into fatigue simulation software, importing the stress distribution result of the shift hub shell (401) corresponding to the reference torque, setting the shift hub in the two driving directions and corresponding to each torque condition and stress channels and cyclic conditions, finding the maximum equivalent stress of each node of the shift hub for each torque, selecting the shift hub fatigue simulation influencing factor according to the load history of the load spectrum matrix of the shift hub durability test condition, calculating the fatigue cumulative damage of the shift hub based on the fatigue criterion, outputting the fatigue result of the shift hub groove, and judging the fatigue life of the shift hub groove.

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