Auxiliary tool for fatigue resistance test of leaf spring in automatic transmission

Abstract

The utility model relates to an auxiliary tool for fatigue resistance test of a leaf spring in an automatic transmission, relates to the technical field of vehicle-mounted automatic transmissions, and solves the problem that the existing universal fatigue test equipment cannot perform fatigue detection on a special-shaped leaf spring. The fixing piece is used for fixing one end of the sheet spring, the pushing and pressing piece is used for pushing and pressing the other end of the sheet spring downwards, and the pushing and pressing piece comprises a vertical plate which is arranged on the bottom plate and is opposite to the fixing piece and a top plate which is detachably arranged at the top end of the vertical plate; a through hole is formed in the position, corresponding to the other end of each leaf spring, of the top plate, a test push rod is arranged in each through hole in a sliding mode, and the two ends of each test push rod extend out of the corresponding through hole oppositely; the auxiliary tool is matched with the universal fatigue test equipment to test the fatigue resistance of the special-shaped sheet-shaped spring, the special fatigue test equipment does not need to be purchased for the sheet-shaped spring, and the cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of spring fatigue testing technology, and in particular to an auxiliary tooling for fatigue testing of leaf springs in automatic transmissions. Background Technology

[0002] Automatic transmissions utilize planetary gear mechanisms for gear shifting. They automatically change gears based on the accelerator pedal position and vehicle speed, while the driver only needs to operate the accelerator pedal to control the vehicle speed. The springs in an automatic transmission are primarily used to implement the shift lock function, preventing automatic gear skipping or disengagement. They are a core component of the automatic transmission; therefore, to ensure safe driving, fatigue testing of the springs in automatic transmissions is necessary.

[0003] Existing general-purpose fatigue testing equipment can only test ordinary springs (such as coil springs), while automatic transmissions use leaf springs (4'). Figure 1 Because of the unique shape of this leaf spring 4', it cannot be directly tested on general-purpose fatigue testing equipment, and there is no corresponding fatigue testing equipment that can directly meet the fatigue performance testing requirements of the leaf spring 4'. Therefore, in order to solve the existing technical problems, this utility model provides an auxiliary fixture that works with general-purpose fatigue testing equipment to achieve the testing of the fatigue performance of irregular leaf springs. Utility Model Content

[0004] The purpose of this invention is to provide an auxiliary tooling for fatigue testing of leaf springs in automatic transmissions, which solves the problem that existing general-purpose fatigue testing equipment cannot perform fatigue testing on irregular leaf springs.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides an auxiliary tooling for fatigue testing of leaf springs in automatic transmissions, including a base plate, on which the following are provided:

[0007] A fixing member is provided to fix one end of the leaf spring, and at least one set of fixing members are provided;

[0008] A pressing member is used to press down on the other end of the leaf spring. The pressing member includes a vertical plate disposed on the base plate and disposed opposite to the fixing member, and a top plate detachably disposed on the top of the vertical plate. A through hole is provided on the top plate at a position corresponding to the other end of each leaf spring fixed on the fixing member. A test push rod is slidably disposed in the through hole, and the two ends of the test push rod extend out of the through hole in opposite directions.

[0009] Furthermore, the test push rod is rectangular in shape, and the shape of the through hole is adapted to the shape of the test push rod.

[0010] Furthermore, the upper end face of the upright plate is provided with at least one limiting post, and the top plate is provided with a limiting hole that cooperates with the limiting post.

[0011] Furthermore, a limiting plate is provided at the top or both ends of the test push rod, the area of ​​the limiting plate is larger than the area of ​​the through hole, and the limiting plate is detachably connected to the test push rod.

[0012] Furthermore, the fixing member includes a support base mounted on the base plate and a pressure plate detachably connected to the upper end face of the support base. The upper end face of the support base is provided with at least one placement groove along its length for placing one end of the leaf spring. The depth of the placement groove is less than the thickness of one end of the leaf spring. The pressure plate is provided with an embedding groove at a position corresponding to the lug of the leaf spring.

[0013] Furthermore, a threaded hole is provided in the placement groove at a position corresponding to the hole at one end of the leaf spring, and a fixing screw is provided in the pressure plate at a position corresponding to the threaded hole.

[0014] Furthermore, the fasteners are provided in two sets, which are symmetrically arranged on both sides of the pusher. The number of through holes on the top plate corresponds to the number of leaf springs fixed on the fasteners.

[0015] Furthermore, the upper end face of the support base is rounded at the side closest to the pusher.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0017] This utility model provides an auxiliary fixture for fatigue testing of leaf springs in automatic transmissions. This auxiliary fixture, in conjunction with a general-purpose fatigue testing device, enables the testing of the fatigue resistance of irregularly shaped leaf springs. It eliminates the need to purchase dedicated fatigue testing equipment for leaf springs, reducing the application requirements of the fatigue testing equipment and saving costs. Furthermore, by using this auxiliary fixture with the general-purpose fatigue testing equipment, the distance and angle of the applied force of the general-purpose fatigue testing equipment remain unchanged, enabling the detection of the fatigue performance of the leaf springs. The fatigue test results are consistent with the expected results under the operating conditions of this type of product. Attached Figure Description

[0018] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0019] Figure 1 This is a perspective view of a sheet spring according to a preferred embodiment of the present invention;

[0020] Figure 2 This is a front view of a leaf spring according to a preferred embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the overall structure of the auxiliary tooling according to a preferred embodiment of the present invention;

[0022] Figure 4 This is a cross-sectional view of an auxiliary tooling with a fixed leaf spring according to a preferred embodiment of the present invention;

[0023] Figure 5 This is an enlarged view of the fastener structure of a preferred embodiment of this utility model;

[0024] Figure 6 This is an enlarged view of the pusher structure of a preferred embodiment of this utility model.

[0025] The reference numerals in the attached figures are explained as follows:

[0026] 1. Base plate; 2. Fixing component; 21. Support base; 22. Pressure plate; 23. Placement slot; 24. Embedding slot; 3. Pushing component; 31. Vertical plate; 32. Top plate; 33. Through hole; 34. Test push rod; 4. Leaf spring; 5. Threaded hole; 7. Fixing screw; 6. Smooth hole; 8. Limiting post; 9. Limiting hole; 10. Limiting plate. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] refer to Figure 3 and Figure 4 This utility model provides an auxiliary tooling for fatigue testing of leaf springs in automatic transmissions. This auxiliary tooling is used in conjunction with a general-purpose fatigue testing device. It includes a base plate 1, which is installed on the worktable of the general-purpose fatigue testing device. The base plate 1 is provided with a fixing member 2 and a pushing member 3. The fixing member 2 is used to fix one end of the leaf spring 4, and the pushing member 3 is used to push the other end of the leaf spring 4 downward.

[0031] refer to Figures 1-5 The fixing component 2 includes a support base 21 mounted on the base plate 1 and a pressure plate 22 detachably connected to the upper surface of the support base 21. The upper surface of the support base 21 has at least one placement groove 23 along its length for placing one end of the leaf spring 4. The depth of the placement groove 23 is less than the thickness of one end of the leaf spring 4. The pressure plate 22 has an embedding groove 24 at a position corresponding to the lug of the leaf spring 4. In this example, there are two placement grooves 23, evenly distributed along the length of the support base 21. When one end of the leaf spring 4 is placed in the placement groove 23, the placement groove 23 limits the movement of the leaf spring 4. When the pressure plate 22 covers the upper surface of the leaf spring 4, the pressure plate 22 is locked to the support base 21 by bolts to achieve fixation. Based on the structural characteristics of the leaf spring 4, a hole is provided at one end of the leaf spring 4. Therefore, a threaded hole 5 is provided in the placement groove 23 at the position corresponding to the hole at one end of the leaf spring 4. A fixing screw 7 is provided on the pressure plate 22 at the position corresponding to the threaded hole 5. A light hole 6 is provided on the pressure plate 22 for the fixing screw 7 to pass through. A stepped surface is provided at the top of the inside of the light hole 6. The fixing screw 7 is a fixing screw 7 with an end cap. After one end of the leaf spring 4 is fixed in the fixing member 2, it is locked again by the fixing screw 7 to improve the firmness. At the same time, the fixing screw 7 can also limit the leaf spring 4 to prevent the leaf spring 4 from moving.

[0032] refer to Figures 3-5 Based on the structural characteristics of the leaf spring 4, the upper end face of the support base 21 is rounded on the side close to the pressing member 3. When the leaf spring 4 is placed in the placement groove 23, the bottom end of one end of the leaf spring 4 is in contact with the rounded corner surface, which can improve the stability of the leaf spring 4.

[0033] refer to Figures 3-5 At least one fixing member 2 is provided. In this example, there are two sets of fixing members 2. The two sets of fixing members 2 are symmetrically arranged on both sides of the pushing member 3. Since two leaf springs 4 can be fixed on each set of fixing members 2, fatigue resistance tests on four leaf springs 4 can be performed simultaneously, thus improving the testing efficiency.

[0034] refer to Figure 3 , Figure 4 and Figure 6 The pushing component 3 includes a vertical plate 31 mounted on the base plate 1 and opposite to the fixing component 2, and a top plate 32 detachably mounted on the top of the vertical plate 31. The height of the vertical plate 31 is greater than the height of the support base 21. When one end of the leaf spring 4 is fixed to the fixing component 2, the other end of the leaf spring 4 is located below the top plate 32. A through hole 33 is provided on the top plate 32 at a position corresponding to the other end of each leaf spring 4. In this example, there are four through holes 33. A test push rod 34 is slidably mounted in each through hole 33, with both ends of the test push rod 34 extending out of the through hole 33 in opposite directions. At least one limiting post 8 is provided on the upper end face of the upright plate 31, and a limiting hole 9 is provided on the top plate 32 to cooperate with the limiting post 8. The cooperation between the limiting hole 9 and the limiting post 8 enables the top plate 32 to be quickly installed on the top plate 32, and also serves as a limiting function, improving the installation accuracy of the top plate 32, thereby improving the accuracy of the test push rod 34 on the top plate 32 pushing the leaf spring 4.

[0035] Working Principle: This auxiliary fixture is installed on a general-purpose fatigue testing equipment. The leaf spring 4 to be tested is fixed to the fixing part 2. At this time, a fixed plate is set at the bottom of the reciprocating longitudinally movable motion shaft on the general-purpose fatigue testing equipment. When the motion shaft moves longitudinally, the fixed plate on it simultaneously pushes four test push rods 34 downward. When the motion shaft returns to its original position, the test push rods 34 will return to their original position under the elastic force of the leaf spring 4. Therefore, in conjunction with the general-purpose fatigue testing equipment, multiple push-reset operations of the leaf spring 4 are achieved, thereby testing the fatigue resistance of the leaf spring 4. Therefore, by using this auxiliary fixture in conjunction with the general-purpose fatigue testing equipment, the distance and angle positions of the force applied by the general-purpose fatigue testing equipment can be guaranteed not to change, and the fatigue performance of the leaf spring 4 can be tested.

[0036] refer to Figure 3 , Figure 4 and Figure 6The test push rod 34 is rectangular in shape, and the shape of the through hole 33 is adapted to the shape of the test push rod 34. This structure serves as a limit, ensuring the stability of the longitudinal movement of the test push rod 34. Limiting plates 10 are provided at the top or both ends of the test push rod 34. The area of ​​the limiting plate 10 is larger than the area of ​​the through hole 33. The limiting plate 10 is detachably connected to the test push rod 34. When the test push rod 34 pushes the leaf spring 4 longitudinally back and forth, the limiting plate 10 prevents the test push rod 34 from disengaging from the through hole 33. It also increases the contact area with the bottom fixing plate of the motion shaft, facilitating the pushing of the test push rod 34.

[0037] In summary, by using this auxiliary tooling in conjunction with a general-purpose fatigue testing device to test the fatigue resistance of the irregular leaf spring 4, it is not necessary to purchase dedicated fatigue testing equipment for the leaf spring 4, which reduces the application capability requirements of the fatigue testing equipment, saves costs, and the fatigue test results are consistent with the expected results under the working conditions of this type of product.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An auxiliary tooling for fatigue testing of leaf springs in an automatic transmission, characterized in that, Includes a base plate (1), on which are provided: Fixing member (2), the fixing member (2) is used to fix one end of the leaf spring (4), and the fixing member (2) is provided in at least one set; The pushing member (3) is used to push the other end of the leaf spring (4) downward. The pushing member (3) includes a vertical plate (31) disposed on the base plate (1) and disposed opposite to the fixing member (2) and a top plate (32) detachably disposed on the top of the vertical plate (31). A through hole (33) is provided on the top plate (32) at a position corresponding to the other end of each leaf spring (4) fixed on the fixing member (2). A test push rod (34) is slidably disposed in the through hole (33). The two ends of the test push rod (34) extend out of the through hole (33) from opposite directions.

2. The auxiliary tooling for fatigue testing of leaf springs in an automatic transmission according to claim 1, characterized in that, The test push rod (34) is rectangular, and the shape of the through hole (33) is adapted to the shape of the test push rod (34).

3. The auxiliary fixture for fatigue testing of leaf springs in an automatic transmission according to claim 1 or 2, characterized in that, The upper end face of the upright plate (31) is provided with at least one limiting post (8), and the top plate (32) is provided with a limiting hole (9) that cooperates with the limiting post (8).

4. The auxiliary tooling for fatigue testing of leaf springs in an automatic transmission according to claim 3, characterized in that, The test push rod (34) is provided with a limiting plate (10) at its top or both ends. The area of ​​the limiting plate (10) is larger than the area of ​​the through hole (33). The limiting plate (10) is detachably connected to the test push rod (34).

5. The auxiliary tooling for fatigue testing of leaf springs in an automatic transmission according to claim 4, characterized in that, The fastener (2) includes a support base (21) mounted on the base plate (1) and a pressure plate (22) detachably connected to the upper end face of the support base (21). The upper end face of the support base (21) is provided with at least one placement groove (23) for placing one end of the leaf spring (4) along its length. The depth of the placement groove (23) is less than the thickness of one end of the leaf spring (4). The pressure plate (22) is provided with an embedding groove (24) at a position corresponding to the lug of the leaf spring (4).

6. The auxiliary tooling for fatigue testing of leaf springs in an automatic transmission according to claim 5, characterized in that, A threaded hole (5) is provided in the placement groove (23) at a position corresponding to the hole at one end of the leaf spring (4), and a fixing screw (7) is provided in the pressure plate (22) at a position corresponding to the threaded hole (5).

7. The auxiliary fixture for fatigue testing of leaf springs in an automatic transmission according to claim 5 or 6, characterized in that, The fixing member (2) is provided in two sets, and the two sets of fixing members (2) are symmetrically arranged on both sides of the pushing member (3). The number of through holes (33) on the top plate (32) corresponds to the number of leaf springs (4) fixed on the fixing member (2).

8. The auxiliary tooling for fatigue testing of leaf springs in an automatic transmission according to claim 7, characterized in that, The upper surface of the support base (21) is rounded near the side of the pusher (3).

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