A fatigue test device for shift actuator with shift fork

Abstract

The utility model relates to the technical field of gear shifting actuator test, disclose a kind of fatigue test device of gear shifting actuator with shift fork, including test frame, gear shifting actuator assembly and fatigue test mechanism;Test frame includes bottom plate and top plate;Several vertical legs are distributed between bottom plate and top plate and are equipped;Bottom plate is equipped with boss guide rail;Fatigue test mechanism is located on bottom plate, and the bottom of fatigue test mechanism is slidably arranged on boss guide rail;Top plate is equipped with opening, gear shifting actuator assembly is erected on top plate by opening, and it is located in the upside of fatigue test mechanism, and gear shifting actuator assembly bottom has several shift forks;Several shift forks are connected with fatigue test mechanism and are equipped. The device is specially fatigue tested to gear shifting actuator with shift fork, can accurately simulate the stress condition and motion state of gear shifting actuator in actual working process, to effectively investigate the fatigue life of gear shifting actuator assembly and each relevant component.

Description

Technical Field

[0001] This utility model relates to the field of testing technology for gear shifting actuators, specifically a fatigue testing device for a gear shifting actuator with a shift fork. Background Technology

[0002] In recent years, my country's new energy vehicle industry has experienced explosive and rapid development. This wave of development has not only swept through the passenger vehicle sector but has also yielded significant results in the commercial vehicle sector. Driven by both policy and technology, the market competitiveness of new energy commercial vehicles has steadily improved.

[0003] In specific operational scenarios such as mining areas, pure electric mining trucks are gradually gaining market favor due to their significant advantages in usage and maintenance costs. The harsh working environment in mines places extremely high demands on vehicle reliability and economy. Compared to traditional fuel-powered mining trucks, pure electric mining trucks offer clear advantages in energy consumption and maintenance, effectively reducing operating costs and improving operational efficiency. Therefore, as mining areas continue to increase their requirements for cost control and environmental protection, the market demand for pure electric mining trucks will continue to expand.

[0004] However, in the development of new energy commercial vehicles, especially new energy heavy trucks and pure electric mining trucks, the performance and reliability of the gear shift actuator, as a key component, are crucial. The fatigue life of the gear shift actuator assembly and its related components directly affects the vehicle's service life, safety, and operating efficiency. However, existing testing equipment on the market has many problems: its complex structure and inconvenient installation make it impossible to comprehensively and accurately assess the fatigue life of the gear shift actuator assembly and its related components. This makes it difficult for companies to accurately evaluate the performance and reliability of the gear shift actuator during product development and quality control, increasing product development cycles and costs, and also posing potential risks to the safe operation of vehicles.

[0005] Therefore, developing a test device that is simple in structure, easy to install, and can effectively examine the fatigue life of the shift actuator assembly and its related components is of great practical significance for improving the performance and reliability of shift actuators in new energy commercial vehicles and promoting the development of the new energy commercial vehicle industry. Utility Model Content

[0006] The purpose of this invention is to provide a fatigue testing device for a gear shifting actuator with a shift fork, so as to solve the technical problem of how to simulate gear shifting of the gear shifting actuator.

[0007] This utility model is achieved through the following technical solution:

[0008] A fatigue testing device for a shift actuator with a shift fork includes a test frame, a shift actuator assembly, and a fatigue testing mechanism.

[0009] The test frame includes a base plate and a top plate; several upright legs are distributed between the base plate and the top plate; a boss guide rail is provided on the base plate; the fatigue testing mechanism is located on the base plate, and the bottom of the fatigue testing mechanism is slidably mounted on the boss guide rail;

[0010] The top plate has an opening, and the gear shifting mechanism assembly is mounted on the top plate through the opening and is located directly above the fatigue testing mechanism. The bottom of the gear shifting mechanism assembly has several shift forks; the several shift forks are connected to the fatigue testing mechanism.

[0011] Preferably, the fatigue testing mechanism includes several vertical plate assemblies and guide shafts;

[0012] The plurality of vertical plate assemblies are respectively slidably arranged side by side on the boss guide rail;

[0013] Several vertical plate assemblies are provided with through holes; the guide shaft passes through the through holes of several vertical plate assemblies in sequence;

[0014] A shift simulation unit is provided between adjacent vertical plate assemblies; each shift simulation unit is slidably sleeved on a guide shaft;

[0015] Several shift forks are respectively connected to several shift simulation units.

[0016] Furthermore, the shift simulation unit includes two sets of sleeve elastic components and sliding sleeves;

[0017] Two sets of sleeve elastic components are respectively installed on opposite sides of adjacent vertical plate assemblies;

[0018] The sliding sleeves are respectively disposed between the two sets of sleeve elastic components and are in elastic contact with the two sets of sleeve elastic components;

[0019] The shift fork is connected to the sliding sleeve.

[0020] Furthermore, the outer ring of the sliding sleeve is provided with an annular groove, and the shift fork is connected to the annular groove; the inner ring of the sliding sleeve is provided with an inner spline groove for mating with the guide shaft.

[0021] Furthermore, the number of shift forks corresponds to the number of sliding sleeves.

[0022] Furthermore, the sleeve elastic component includes a limiting sleeve and a helical spring;

[0023] The limiting sleeve is sleeved on the guide shaft, with one end set on the vertical plate assembly and the other end in contact with the sliding sleeve;

[0024] The helical spring is sleeved on the guide shaft and located inside the limiting sleeve, with one end set on the vertical plate assembly and the other end connected to the sliding sleeve.

[0025] Furthermore, the length of the helical spring is greater than the length of the limiting sleeve.

[0026] Furthermore, the length of the helical spring corresponds to the distance between the sliding sleeve and the vertical plate assembly.

[0027] Furthermore, the upright assembly includes an upright plate and a base;

[0028] The upright plate is vertically fixed to the base, the through hole is provided in the upright plate, and the guide shaft passes through the upright plate through the through hole;

[0029] The base has a recessed groove at its bottom, and the base is slidably mounted on the boss guide rail through the recessed groove.

[0030] Furthermore, the bottom of the base plate is provided with countersunk holes for fixing the base plate to the base by bolts through the countersunk holes.

[0031] Compared with the prior art, the present invention has the following beneficial technical effects:

[0032] This invention provides a fatigue testing device for a gear shifting actuator with a shift fork. The testing device mainly consists of three parts: a test frame, a gear shifting actuator assembly, and a fatigue testing mechanism. The test frame is composed of a base plate, a top plate, and several upright legs, providing stable support to ensure the stability of the entire device during the test, reducing the adverse effects of vibration or shaking on the test results, and ensuring the accuracy and reliability of the test data. The fatigue testing mechanism is located on the base plate and is slidably mounted on the boss guide rail at the bottom. The gear shifting actuator assembly is mounted on the top plate through an opening in the top plate and is located directly above the fatigue testing mechanism. This vertical layout makes full use of space, resulting in a compact overall structure with a small footprint, facilitating installation and use in limited spaces, and also facilitating observation and operation of the test process. This device is specifically designed for fatigue testing of gear shifting actuators with shift forks, accurately simulating the stress and motion state of the gear shifting actuator during actual operation. This effectively examines the fatigue life of the gear shifting actuator assembly and its related components, providing a powerful testing method for the design optimization, quality inspection, and reliability assessment of gear shifting actuators.

[0033] Furthermore, the fatigue testing mechanism consists of several vertical plate assemblies and shift simulation units. The number of these assemblies and units can be easily increased or decreased to accommodate fatigue testing of different specifications and types of shift actuators, reducing the cost of equipment upgrades and modifications. Guide rails and guide shafts provide precise guidance for the vertical plate assemblies and shift simulation units, ensuring they move along a predetermined trajectory during testing, reducing test errors caused by motion deviations, and improving test accuracy and repeatability. Each shift simulation unit is connected to a shift fork, accurately simulating the shifting action and stress conditions of the shift actuator in actual operation. By precisely controlling the movement and stress of the shift simulation units, the fatigue characteristics of the shift actuator under various working conditions can be more realistically reflected.

[0034] Furthermore, during the shifting process, when the shift fork drives the sliding sleeve to move, the sliding sleeve makes elastic contact with the two sets of sleeve elastic components, which can simulate the elastic resistance experienced by the shifting actuator during actual shifting. This resistance changes with the shifting stroke, more realistically restoring the force characteristics during the shifting process. This makes the test results closer to actual working conditions and helps to accurately evaluate the performance of the shifting actuator in actual use.

[0035] Furthermore, the annular groove on the outer ring of the sliding sleeve provides a dedicated connection point for the shift fork. The shift fork connects to the annular groove, which is more stable than other connection methods, effectively preventing loosening or detachment during testing. This ensures stable and reliable power transmission between the shift fork and the sliding sleeve, guaranteeing the normal operation of the entire shift simulation unit during testing and improving the accuracy and reliability of test data. The annular groove provides a clear positioning reference for the shift fork installation, allowing it to be quickly and accurately installed onto the sliding sleeve, reducing adjustment time and difficulty during installation and improving installation efficiency. Simultaneously, precise installation positioning helps ensure the relative positional accuracy between the shift fork and the sliding sleeve, ensuring the shift simulation unit can accurately simulate shifting actions, making the test results more consistent with actual conditions.

[0036] Furthermore, the helical spring is sleeved on the guide shaft and located inside the limiting sleeve, with one end connected to the vertical plate assembly and the other end connected to the sliding sleeve. This structure allows the helical spring to provide a stable elastic force to the sliding sleeve during gear shifting. By appropriately selecting the parameters of the helical spring, the elastic resistance experienced by the gear shifting actuator during actual gear shifting can be accurately simulated, making the test results closer to actual working conditions. This helps to accurately evaluate the performance and fatigue life of the gear shifting actuator under different elastic forces.

[0037] Furthermore, the upright plate assembly consists of an upright plate and a base. The upright plate is vertically fixed to the base, increasing the overall structural strength of the upright plate assembly. During the test, the upright plate assembly needs to withstand the forces from the shift simulation unit and the shift fork. The stable structure of the upright plate assembly ensures that it will not deform or be damaged, providing reliable support for the entire fatigue test mechanism and ensuring the smooth progress of the test. Attached Figure Description

[0038] Figure 1 This is a three-dimensional schematic diagram of the fatigue testing device for the shifting actuator with a shift fork in an embodiment of this utility model;

[0039] Figure 2 This is a front view of the fatigue testing device for the gear shifting actuator with a shift fork in this embodiment of the present invention;

[0040] In the diagram: 1. Test frame; 2. Gear shifting actuator assembly; 3. Fatigue testing mechanism; 11. Base plate; 12. Vertical leg; 13. Top plate; 14. Boss guide rail; 15. Countersunk through hole; 21. Shift fork; 31. Vertical plate assembly; 32. Sliding sleeve; 33. Limiting sleeve; 34. Guide shaft; 35. Helical spring; 311. Vertical plate; 312. Base; 321. Annular groove. Detailed Implementation

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0042] The purpose of this invention is to provide a fatigue testing device for a gear shifting actuator with a shift fork, so as to solve the technical problem of how to simulate gear shifting of the gear shifting actuator.

[0043] The present invention will now be described in further detail with reference to the accompanying drawings:

[0044] See Figure 1 and Figure 2 In one embodiment of the present invention, a fatigue testing device for a shifting actuator with a shift fork is provided, comprising a test frame 1, a shifting actuator assembly 2, and a fatigue testing mechanism 3;

[0045] The test frame 1 includes a base plate 11 and a top plate 13; a plurality of upright legs 12 are distributed between the base plate 11 and the top plate 13; a boss guide rail 14 is provided on the base plate 11; the fatigue test mechanism 3 is located on the base plate 11, and the bottom of the fatigue test mechanism 3 is slidably arranged on the boss guide rail 14.

[0046] The top plate 13 has an opening, and the gear shifting mechanism assembly 2 is mounted on the top plate 13 through the opening and is located directly above the fatigue testing mechanism 3. The bottom of the gear shifting mechanism assembly 2 has several shift forks 21; the several shift forks 21 are connected to the fatigue testing mechanism 3.

[0047] Preferably, the fatigue testing mechanism 3 includes several vertical plate assemblies 31 and guide shafts 34; the several vertical plate assemblies 31 are respectively slidably arranged side by side on the boss guide rail 14; each of the several vertical plate assemblies 31 is provided with a through hole; the guide shaft 34 passes through the through holes of the several vertical plate assemblies 31 in sequence; a shift simulation unit is provided between adjacent vertical plate assemblies 31; the shift simulation units are all slidably sleeved on the guide shaft 34; a several shift forks 21 are respectively connected to the several shift simulation units.

[0048] The shifting simulation unit includes two sets of sleeve elastic components and a sliding sleeve 32; the two sets of sleeve elastic components are respectively arranged on opposite sides of adjacent vertical plate assemblies 31; the sliding sleeve 32 is respectively arranged between the two sets of sleeve elastic components and elastically contacts the two sets of sleeve elastic components; the shift fork 21 is connected to the sliding sleeve 32, wherein the number of shift forks 21 corresponds to the number of sliding sleeves 32.

[0049] In this embodiment, the outer ring of the sliding sleeve 32 is provided with an annular groove 321, and the shift fork 21 is connected to the annular groove 321; the inner ring of the sliding sleeve 32 is provided with an inner spline groove for cooperating with the guide shaft 34.

[0050] Specifically, the sleeve elastic assembly includes a limiting sleeve 33 and a helical spring 35. The limiting sleeve 33 is sleeved on the guide shaft 34, with one end mounted on the vertical plate assembly 31 and the other end in contact with the sliding sleeve 32. The helical spring 35 is sleeved on the guide shaft 34 and located inside the limiting sleeve 33, with one end mounted on the vertical plate assembly 31 and the other end connected to the sliding sleeve 32. The limiting sleeve 33 is mounted on the vertical plate assembly 31 via a stop, and its height is adjusted to ensure shifting displacement.

[0051] The length of the helical spring 35 is greater than the length of the limiting sleeve 33. The length of the helical spring 35 corresponds to the distance between the sliding sleeve 32 and the vertical plate assembly 31.

[0052] In this embodiment, the upright plate assembly 31 includes an upright plate 311 and a base 312; the upright plate 311 is vertically fixed on the base 312, the through hole is provided on the upright plate 311, and the guide shaft 34 passes through the through hole through the upright plate 311; the bottom of the base 312 is provided with a recess, and the base 312 is slidably mounted on the boss guide rail 14 through the recess.

[0053] The bottom of the base plate 11 is provided with a countersunk hole, which is used to fix the base plate 11 to the base by bolts through the countersunk hole.

[0054] In this embodiment, a helical spring 35 is used to simulate the shifting force when the shifting actuator is engaged in different gears. The shifting fork of the shifting actuator is restricted by corresponding tooling to simulate the force and displacement of the shifting actuator in actual operation and to verify the performance and reliability of the shifting actuator.

[0055] In this embodiment, there is an external spline near the middle part of the guide shaft 34, which plays a guiding and supporting role for the sliding sleeve 32. The optical shafts on both sides can be used to guide and support the helical spring 35. The guide shaft 34 is fixed to the adjacent vertical plate assembly 31 by the external threads at both ends.

[0056] In this embodiment, the shift fork 21 cooperates with the sliding sleeve 32. The sliding sleeve 32 cooperates with the guide shaft 34 through the central spline groove to achieve guidance and support. The outer diameter of the helical spring 35 matches the limiting sleeve 33, and the inner diameter matches the guide shaft 34. One end contacts the upright plate 311, and the other end contacts the spline side of the guide shaft 34.

[0057] The fatigue testing device for a shifting actuator with a shift fork provided in this embodiment is used as follows:

[0058] When the shift actuator assembly engages a gear, the shift fork 21 drives the sliding sleeve 32 to move on the spline of the guide shaft 34. Because the size of the inner spline of the sliding sleeve 32 is smaller than the outer diameter of the coil spring 35, the sliding sleeve 32 pushes the coil spring 35, causing the coil spring 35 to compress, thus simulating the gear engagement force. When the end face of the sliding sleeve 32 contacts the limiting sleeve 33, the shift fork 21 can no longer push the sliding sleeve 23, thus achieving the gear engagement limit of the shift actuator.

[0059] In this embodiment, the device features a simple structure, convenient installation, and compact size, allowing it to be placed in confined spaces such as high and low temperature environment chambers. It utilizes springs to simulate load forces, employing a purely mechanical design that eliminates the need for complex control logic. It can be equipped with a shifting actuator for individual fatigue testing, significantly improving testing efficiency and saving resources. The use of helical springs to simulate gear shifting loads is low-cost and easy to replace. The entire device is made of metal, making it largely unaffected by environmental factors and allowing it to be matched to different environments, such as high and low temperature environments, according to the testing requirements of the sample.

[0060] In this embodiment, during installation, the dimensions and stiffness of the helical spring 35 need to be selected in advance according to the gear shifting force requirements of the gear shifting actuator, and the dimensions of the limiting sleeve 33 need to be designed with a corresponding height according to the gear shifting displacement of the gear shifting actuator. During installation, the position of the vertical plate assembly 31 needs to be adjusted to ensure it is in the middle position with the gear shift fork, after which other parts can be installed sequentially.

[0061] After installation, connect the TCU (Automatic Transmission Control Unit) to the shift actuator via a wiring harness. Introduce approximately 0.8 MPa of compressed gas into the air inlet of the shift actuator and turn on the power. The TCU program commands control the internal solenoid valve of the shift actuator to perform shifting. The operation cycle is N→1→N→2→N→3→N→4→N, and each cycle counts once. When the shift actuator is activated, the shift fork pushes the slide sleeve along the guide shaft. At the same time, the slide sleeve compresses the helical spring to simulate the gear engagement force. When the slide sleeve slides to the end face and contacts the limit sleeve, the shift actuator moves to the limit position, thereby limiting the gear engagement displacement.

[0062] In summary, this utility model provides a fatigue testing device for a gear shifting actuator with a shift fork. The testing device mainly consists of three parts: a test frame, a gear shifting actuator assembly, and a fatigue testing mechanism. The test frame is composed of a base plate, a top plate, and several upright legs, providing stable support and ensuring the stability of the entire device during the test. This reduces the adverse effects of vibration or shaking on the test results and ensures the accuracy and reliability of the test data. The fatigue testing mechanism is located on the base plate and is slidably mounted on the boss guide rail at the bottom. The gear shifting actuator assembly is mounted on the top plate through an opening in the top plate and is located directly above the fatigue testing mechanism. This vertical layout makes full use of space, resulting in a compact overall structure with a small footprint, facilitating installation and use in limited spaces. It also facilitates observation and operation during the test process. This device is specifically designed for fatigue testing of gear shifting actuators with shift forks. It can accurately simulate the stress and motion state of the gear shifting actuator during actual operation, thereby effectively examining the fatigue life of the gear shifting actuator assembly and its related components. This provides a powerful testing method for the design optimization, quality inspection, and reliability assessment of gear shifting actuators.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A fatigue testing device for a gear shifting actuator with a shift fork, characterized in that, It includes a test frame (1), a gear shifting actuator assembly (2), and a fatigue testing mechanism (3); The test frame (1) includes a base plate (11) and a top plate (13); a plurality of upright legs (12) are distributed between the base plate (11) and the top plate (13); a boss guide rail (14) is provided on the base plate (11); the fatigue test mechanism (3) is located on the base plate (11), and the bottom of the fatigue test mechanism (3) is slidably arranged on the boss guide rail (14); The top plate (13) has an opening, and the gear shifting mechanism assembly (2) is mounted on the top plate (13) through the opening and is located directly above the fatigue testing mechanism (3). The bottom of the gear shifting mechanism assembly (2) has several shift forks (21); the several shift forks (21) are connected to the fatigue testing mechanism (3).

2. The fatigue testing device for a gear shifting actuator with a shift fork according to claim 1, characterized in that, The fatigue testing mechanism (3) includes several vertical plate assemblies (31) and guide shafts (34). The plurality of vertical plate assemblies (31) are respectively slidably arranged side by side on the boss guide rail (14); Several vertical plate assemblies (31) are provided with through holes; the guide shaft (34) passes through the through holes of several vertical plate assemblies (31) in sequence; A shift simulation unit is provided between adjacent vertical plate assemblies (31); the shift simulation units are all slidably sleeved on the guide shaft (34); Several shift forks (21) are respectively connected to several shift simulation units.

3. The fatigue testing device for a gear shifting actuator with a shift fork according to claim 2, characterized in that, The shifting simulation unit includes two sets of sleeve elastic components and a sliding sleeve (32); Two sets of sleeve elastic components are respectively installed on opposite sides of adjacent vertical plate assemblies (31); The sliding sleeve (32) is respectively disposed between the two sets of sleeve elastic components and is in elastic contact with the two sets of sleeve elastic components; The fork (21) is connected to the slide sleeve (32).

4. The fatigue testing device for a gear shifting actuator with a shift fork according to claim 3, characterized in that, The outer ring of the sliding sleeve (32) is provided with an annular groove (321), and the shift fork (21) is connected to the annular groove (321); the inner ring of the sliding sleeve (32) is provided with an inner spline groove for cooperating with the guide shaft (34).

5. The fatigue testing device for a gear shifting actuator with a shift fork according to claim 3, characterized in that, The number of the shift forks (21) corresponds to the number of the sliding sleeves (32).

6. The fatigue testing device for a gear shifting actuator with a shift fork according to claim 3, characterized in that, The sleeve elastic component includes a limiting sleeve (33) and a helical spring (35); The limiting sleeve (33) is sleeved on the guide shaft (34), with one end set on the vertical plate assembly (31) and the other end in contact with the sliding sleeve (32); The helical spring (35) is sleeved on the guide shaft (34) and located inside the limiting sleeve (33), with one end set on the vertical plate assembly (31) and the other end connected to the sliding sleeve (32).

7. The fatigue testing device for a gear shifting actuator with a shift fork according to claim 6, characterized in that, The length of the helical spring (35) is greater than the length of the limiting sleeve (33).

8. The fatigue testing device for a gear shifting actuator with a shift fork according to claim 6, characterized in that, The length of the helical spring (35) corresponds to the distance between the sliding sleeve (32) and the vertical plate assembly (31).

9. A fatigue testing device for a gear shifting actuator with a shift fork according to claim 2, characterized in that, The upright plate assembly (31) includes an upright plate (311) and a base (312); The upright plate (311) is vertically fixed on the base (312), the through hole is provided on the upright plate (311), and the guide shaft (34) passes through the upright plate (311) through the through hole. The bottom of the base (312) is provided with a recessed groove, and the base (312) is slidably mounted on the boss guide rail (14) through the recessed groove.

10. A fatigue testing device for a gear shifting actuator with a shift fork according to claim 2, characterized in that, The bottom of the base plate (11) is provided with a countersunk through hole, which is used to fix the base plate (11) to the base by bolts through the countersunk through hole.

Images