Automobile sleeve slip test tool

Abstract

This invention discloses a sliding test fixture for automotive sleeves, relating to the field of test fixture technology. It includes a main body comprising at least a main wall and a top wall perpendicular to each other. A groove is provided on the inner surface of the main wall, and a test plate is installed in the groove, abutting against the toothed end of the workpiece. The workpiece and the test plate are locked to the main wall by a main screw. A limiting part is provided on the main wall, and two sets of positioning screws are also provided on the main wall. The ends of the positioning screws located on the inner side of the main wall extend with positioning rods. Before the main screw is locked, a pair of positioning plates position the workpiece by the positioning rods, ensuring that the workpiece axis is collinear with the main screw axis. A pressure application part is provided directly above the workpiece to apply pressure or impact force. This automotive sleeve sliding test fixture, with locking areas at the ends of the main screw and adjusting screw, can lock the main screw to the adjusting screw after it rotates at any angle. Because the thread parameters of the two screws are different, they cannot rotate synchronously, thus completely locking the main screw and achieving stable fixation.

Description

Technical Field

[0001] This invention relates to the field of testing fixture technology, specifically to a testing fixture for automotive sleeve sliding. Background Technology

[0002] The flange face of the automotive subframe bushing (or bushing) adopts a toothed (also known as a canine tooth or serrated) design. Its main purpose is to generate great anti-rotation and anti-slip friction through the interference fit and mechanical interlock between the tooth and the metal hole wall after the bolts are tightened through the bushing hole. This ensures that the connection point will not loosen when subjected to complex alternating stresses (such as vibration, torque, and impact) over a long period of time, thus ensuring the stability of the suspension geometry and driving safety.

[0003] This highly efficient anti-loosening design concept is widely used in fields with extremely high requirements for safety and reliability, such as automobiles, machinery, and aerospace. Below are some typical application locations and scenarios besides subframe bushings: Suspension system connection points: Control arm bushings: Bushing flanges connecting the control arm and subframe / body typically use a toothed design; this is the most common application location besides subframe bushings. Stabilizer bar (anti-roll bar) linkages: Ball joints or bushing mounts connecting the stabilizer bar and shock absorbers or lower control arms.

[0004] Some vehicle body reinforcement components or bracket mounting points employ a toothed design to improve rigidity and prevent abnormal noises. Therefore, the slippage test of the sleeve is particularly important. Existing sleeve slippage tests cannot fully tighten the sleeve, and the bolts may loosen under test conditions, thus affecting the test results. To address this, we propose a new automotive sleeve slippage test fixture. Summary of the Invention

[0005] The purpose of this invention is to provide a testing fixture for automotive sleeve slippage, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sliding test fixture for automotive sleeves, comprising a main body, the main body including at least a main wall and a top wall perpendicular to each other, the main wall being horizontal in the normal direction, a groove being provided on the inner surface of the main wall, a test plate being installed in the groove to abut against the toothed end of the workpiece, the workpiece and the test plate being locked to the main wall by a main screw, a limiting part being provided on the main wall to restrict the main screw from rotating during the test, two sets of positioning screws being provided on the main wall, the axis of the positioning screws being at the same horizontal height as the axis of the main screw and locking the test plate, a positioning rod extending from the end of the positioning screw located on the inner side of the main wall, a pair of positioning plates positioning the workpiece by the positioning rod before the main screw is locked, so that the axis of the workpiece is collinear with the axis of the main screw, a pressure part being provided directly above the workpiece to apply pressure or impact force to the workpiece.

[0007] Preferably, the limiting part is a locking screw, which is screwed into the main wall and its end abuts against the locking end of the main screw.

[0008] Preferably, the limiting part further includes an adjusting screw coaxial with the main screw, the threaded end of the adjusting screw abutting against the main screw to restrict the rotation of the main screw, and the end of the locking screw acting on the adjusting screw or the side surface of the adjusting screw and the main screw.

[0009] Preferably, the limiting part includes an adjusting screw coaxial with the main screw. The threaded end of the adjusting screw abuts against the main screw, limiting the axial rotation position of the main screw. The different thread parameters of the adjusting screw and the main screw prevent them from rotating synchronously. The contact end faces of the adjusting screw and the main screw are each divided into at least three annular array locking zones. Each locking zone has annularly spaced protrusions that protrude from the end face of the adjusting screw or the main screw. The spacing between the protrusions in the corresponding locking zones on the adjusting screw and the main screw is different. Locking parts are provided on the protrusions in the corresponding locking zones of the adjusting screw and the main screw, and the locking parts limit the relative rotation of the adjusting screw and the main screw.

[0010] Preferably, the locking part consists of two wedge-shaped anti-rotation plates, which are rotatably connected to a connecting rod, which is detachably mounted on the main body.

[0011] Preferably, the locking part includes a mounting plate, on which two sets of arc-shaped sliders are slidably and lockably provided. The two sets of arc-shaped sliders are coaxially corresponding to the ends of the adjusting screw and the main screw, respectively. Locking blocks are connected inside the arc-shaped sliders. The two locking blocks contact the protrusions and restrict the relative rotation of the adjusting screw and the main screw.

[0012] Preferably, the outer diameter surface of the arc-shaped slider is a toothed surface, and a worm gear is provided on the mounting plate to mesh with the toothed surface to form a self-locking adjustment.

[0013] Preferably, a positioning cylinder is coaxially sleeved on the positioning screw, the end face of the positioning cylinder contacts the test plate, and the edge dimension of the groove is larger than that of the test plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention provides a limiting part on the main screw that locks the workpiece, which can restrict its rotation. Under multiple test conditions, the screw will not loosen due to uneven force, and the main screw will be completely locked, thereby avoiding parameter changes under different test numbers.

[0016] The locking area at the ends of the main screw and the adjusting screw in this invention can lock the main screw to the adjusting screw after it has rotated to any angle. Because the thread parameters of the two screws are different, they cannot rotate synchronously and the main screw is completely locked, thus achieving stable fixation.

[0017] The insertion-type locking method of the present invention is simple and convenient to use, and can be fixed only at the observation slot position. It is simple and easy to use overall.

[0018] The locking method of pulling the protrusion from both sides in this invention can adapt to large angle changes, without the need to set up multiple stepped parts to adapt to different angles, thus having strong adaptability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the unfolded half-section structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the positioning structure of the positioning plate;

[0022] Figure 4 A schematic diagram showing the main body in a semi-sectional state;

[0023] Figure 5 A view of the contact structure between the main screw and the adjusting screw;

[0024] Figure 6 A schematic diagram showing the end limit states of the main screw and the adjusting screw;

[0025] Figure 7 A schematic diagram of the end face structure of the main screw and the adjusting screw;

[0026] Figure 8 A schematic diagram illustrating the relative motion process of the end face structures of the main screw and the adjusting screw;

[0027] Figure 9 Another embodiment of the end face structure of the main screw and the adjusting screw;

[0028] Figure 10 Another embodiment of the end face structure of the main screw and the adjusting screw;

[0029] Figure 11 A schematic diagram of the state structure of an embodiment consisting of a locking part, a stop plate, and a connecting rod;

[0030] Figure 12 This is a schematic diagram of another embodiment of the locking part.

[0031] In the diagram: 1-Main wall; 2-Top wall; 3-Test plate; 4-Positioning screw; 5-Main screw; 6-Positioning rod; 7-Positioning plate; 8-Pressure application part; 9-Locking screw; 10-Adjusting screw; 11-Locking area; 12-Protrusion; 13-Anti-rotation plate; 14-Connecting rod; 15-Main body; 16-Mounting plate; 17-Arc-shaped slider; 18-Locking block; 19-Worm gear; 20-Positioning cylinder; 21-Anti-rotation bolt; 22-Observation slot; 23-Groove. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0033] Please see Figure 1 , Figure 2 and Figure 3This invention provides a technical solution: a sliding test fixture for automotive sleeves, comprising a main body 15. The main body 15 consists of at least one vertical main wall 1 and a top wall 2 perpendicular to the vertical main wall 1. A support leg is provided at the bottom edge of the top wall 2 away from the main wall 1, forming an inverted support with the main wall 1. The side of the main wall 1 facing the support leg is the inner side, and the opposite side is the outer side. A groove 23 is formed on the inner surface of the main wall 1. The shape of the groove 23 corresponds to the shape of the test plate 3, and is rectangular in the figure. Transition grooves are provided at the four corners of the edge of the groove 23 for easy processing. A circular hole is formed at the center of the test plate 3. A main screw 5 passes through both ends of the workpiece and the circular hole in sequence and is screwed onto the main body 15 for fixation. On both sides of the axis at the same horizontal position of the main screw 5, a positioning screw 4 is provided. The positioning screw 4 serves as an auxiliary fixation for the test plate 3 and is also used to position the workpiece in its initial fixed position, i.e., a corresponding positioning screw is formed on the test plate 3. The circular hole of rod 4, the positioning screw 4 is also tightened into the main wall 1 of the main body 15 for locking, or it is locked through the main wall 1 by a nut. An extension, i.e., positioning rod 6, is provided at the end of the positioning screw 4 located on the inner side of the main wall 1. The positioning plate 7 is corresponding to the positioning rod 6. The positioning plate 7 is composed of two symmetrical plates, with semi-annular grooves on the plates corresponding to the workpiece surface and the positioning rod 6, respectively. A pair of positioning plates 7 containing two of them constrain the workpiece under the action of the positioning rod 6, so that the axis of the initial position of the workpiece is collinear with the axis of the main screw 5. The end of the workpiece with the toothed part is attached to the test plate 3. Positioning is performed before locking to ensure accurate positioning. A pressure part 8 is set directly above the workpiece. The pressure part 8 acts directly on the radial outer surface of the workpiece, pushing or impacting the test, gradually increasing the pressure until the end face of the workpiece slides relative to the surface of the test plate 3. The pressure part 8 can be the working end of a press or other equipment, or it can be like Figure 1 As shown, a sliding groove is opened on the top wall 2, and a pressure plate is slidably set there. The lower end of the pressure plate is provided with a semi-circular groove that matches the surface of the workpiece.

[0034] Specifically, before testing, the test plate 3 is first fixed in the groove 23 by the positioning screw 4, and then the main screw 5 is screwed into the main wall 1 after passing through the workpiece and the test plate 3, but not completely locked. The position of the workpiece is restricted by the two positioning plates 7 and the positioning rod 6, and then the main screw 5 is locked.

[0035] The main screw 5 can be directly threaded into the main wall 1, or a threaded sleeve can be provided on the outer side of the main wall 1 and connected to the main screw 5 through the threaded sleeve.

[0036] During testing, pressure is applied radially to the workpiece. Because tightening and loosening the main screw 5 are different after locking, tightening requires greater force to rotate a small angle, while loosening requires less force after exceeding the initial force. Therefore, during testing, when the workpiece contacts the main screw 5, it tends to rotate in the loosening direction (similar to how bolts and nuts loosen under vibration). If the testing conditions are inconsistent, it leads to incorrect experimental data. For example, if the workpiece did not slip in the first test and also did not slip in the second test, but the second test caused a very small angle of rotation of the main screw 5, this affects the axial locking force of the workpiece, causing the basic parameters of the third test to be inconsistent with the first two, resulting in incorrect results. Therefore, a limiting part is set at the end of the main screw 5 to restrict its rotation and prevent parameter changes before and after testing.

[0037] See Figure 4 The limiting part is a locking screw 9, which has two main types. The first type is... Figure 4 As shown, the thread is tightened into the main wall 1 of the body 15, and the end abuts against the side surface of the main screw 5 to form lateral pressure, making the main screw 5 more difficult to rotate. In another embodiment, the locking screw 9 can be as follows: Figure 4 The adjusting screw 10 is in the state shown, pressing against it from one end in the axial direction, applying axial pressure.

[0038] In the embodiment where the locking screw 9 is vertically positioned, an adjusting screw 10 is simultaneously provided along the axial direction of the main screw 5. The adjusting screw has two functions: firstly, it determines the position of the main screw 5, and the axial position can be adjusted and restricted according to the axial length of different workpieces; secondly, it applies axial pressure to make it difficult for the main screw 5 to rotate, thereby improving the stability of the test.

[0039] See Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 Unlike the embodiments described above, where the locking method for the main screw 5 involves applying pressure, this embodiment only raises the threshold and cannot completely restrict the function of the main screw 5. Therefore, in this embodiment, based on the setting of the adjusting screw 10, the two opposite ends of the adjusting screw 10 and the main screw 5 are equally divided into at least three locking areas 11. Each locking area 11 is provided with protrusions 12 spaced apart. The spacing angle between adjacent protrusions 12 in the corresponding locking areas 11 on the adjusting screw 10 and the main screw 5 is different. There are two main ways to lock the adjusting screw 10 and the main screw 5 by using the protrusions 12 to prevent rotation. One is as follows: Figure 6As shown, a baffle is set between one of the protrusions 12 in the adjusting screw 10 and the protrusion 12 in the main screw 5 to restrict it. Another method is to pull it on the other side of the two protrusions 12. The thread parameters of the main screw 5 and the adjusting screw 10 are different, such as lead angle, direction of rotation or pitch, which prevents them from rotating synchronously and will hinder each other. Therefore, it is only necessary to consider the looseness of the main screw 5 during the test (it is limited by the adjusting screw 10 when screwing in, and the two have different thread parameters and cannot rotate synchronously).

[0040] First, the baffle-type design will be explained. The spacing angles of adjacent protrusions 12 within the locking areas 11 corresponding to the main screw 5 and the adjusting screw 10 are preferably linearly related, not as integer multiples. Figure 7 As shown in the example, within the corresponding locking area 11, Figure 7 and Figure 8 In the diagram, A1 and A2 correspond to the end faces of the main screw 5 and the adjusting screw 10, respectively. Figure 8 For ease of explanation, the curved shape is simplified to a straight line. The main screw 5 and the adjusting screw 10 can be considered as one being stationary and the other rotating. Figure 8 Taking the rotation of adjusting screw 10 as an example (equivalent to the reverse rotation of main screw 5), Figure 8 The adjacent protrusions 12 are evenly divided into several units. On the main screw 5, adjacent protrusions 12 are divided into 3 units, while on the adjusting screw 10, adjacent protrusions 12 are divided into 5 units. Including the protrusions 12 themselves, within the locking area 11, both the main screw 5 and the adjusting screw 10 are evenly divided into 12 units, corresponding to 3 and 2 protrusions 12 respectively. The relationship between the two is 2*6=3*4. Figure 8 In the sequence of moving one unit at a time, within the locking zone 11, the circumferential distance between the protrusions 12 on the adjusting screw 10 and the main screw 5 always has a minimum distance and varies between 1 and 2 units. The anti-rotation plate 13 only needs to operate within a small angle range. Divided into four locking zones 11, each zone is divided into 12 units, with each unit having an angle of 7.5°. The required angle change for the anti-rotation plate 13 is 7.5°-15°. Since the angle change is small, it can be achieved with one set of anti-rotation plates 13. If the angle difference is too large, multiple sets are needed in different ranges to form a stepped structure (one set of anti-rotation plates 13 has a limited range of angular rotation). Figure 11 As the connecting rod 14 moves downwards, the two anti-rotation plates 13 will contact the side surface of the protrusion 12 and adaptively fit together, changing the angle. After the two sides fit together, only the position of the connecting rod 14 needs to be fixed to form a shape like... Figure 6 The limit fixing shown is simple and convenient; simply insert and fix it. For easier fixing, as follows: Figure 5As shown, in the area between the main screw 5 and the adjusting screw 10, an observation groove 22 is provided on the main wall 1 to facilitate the locking of the locking part, that is, the anti-rotation plate 13 is inserted between the two protrusions 12 for limiting.

[0041] See Figure 9 In another embodiment, the locking area 11 is divided into 18 units, and the number of protrusions 12 corresponding to the locking areas 11 of the adjusting screw 10 and the main screw 5 are 2 and 3 respectively. The relationship between the two is 2*9=3*6, and the minimum angle between them is two units, that is, the minimum angle is 10°. The minimum angle can be set by adjusting the division. As the minimum angle is adjusted, the upper limit angle will also increase. Figure 10 The unit is divided into 24 units. The number of protrusions 12 in the locking area 11 can also be adjusted to be a non-integer multiple (integers will have a minimum angle of 0). The number of protrusions 12 in the locking area 11 cannot be 1. If the connecting rod 14 is fixed by a threaded connection, as an example, the connecting rod 14 can be made of two sections, which are inserted between each other. One section connected to the anti-rotation plate 13 serves as a connection, and the other section is threaded to adjust the axial displacement. The anti-rotation plate 13 is sent between the two protrusions 12 for limiting. Because the locking area 11 is arranged in an array, the minimum angle can be controlled in any area that is the same as the locking area 11. Therefore, there are always two protrusions 12 with the minimum angle in the observation slot 22, which directly limit and completely lock the main screw 5. The main screw 5 can be rotated at any angle and then limited and completely locked so that it will not change during the test.

[0042] See Figure 12 In another embodiment, the locking method is the opposite of that of the anti-rotation plate 13. The locking is achieved from the other side of the two protrusions 12, meaning the opposing sides of the two disjointed protrusions 12 are abutted. In this embodiment, the angle between the two protrusions 12 does not need to be considered, as long as it is less than 180°. Specifically, two sets of arc-shaped sliders 17 are provided. The arc-shaped sliders 17 slide circumferentially within the mounting plate 16 via T-shaped blocks. The outer diameter surface of the arc-shaped sliders 17 is provided with teeth, and a rotatable adjustable worm gear 19 is provided on the mounting plate 16 for self-locking and adjustment. The inner diameter surface of the arc-shaped sliders 17 is connected to locking blocks 18 to restrict the protrusions 12. Compared to the insert-type locking method, this method does not require consideration of angle, but the fixing process is relatively cumbersome. It requires adjusting the angle of the two locking blocks 18 to be greater than the included angle between the corresponding two protrusions 12 before locking.

[0043] See Figure 2A positioning cylinder 20 is fitted onto the positioning screw 4. The end face of the positioning cylinder 20 contacts the test plate 3. The diameter of the positioning screw 4 is smaller than the circular hole it passes through on the test plate 3. The test plate 3 is fixed by the end face of the positioning cylinder 20 instead of by the positioning screw 4. This is because if the positioning screw 4 is used directly for positioning when the workpiece is pressed down, it is easy to generate a lateral force on the positioning screw 4. Moreover, the small contact area can easily cause the positioning screw 4 to bend or the local pressure on the test plate 3 to be too large. An anti-rotation bolt 21 is also provided on the main wall 1. An anti-rotation plane is provided on the outer wall of the positioning cylinder 20. The anti-rotation bolt 21 is locked on the anti-rotation plane, thereby restricting the rotation of the positioning cylinder 20.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tooling for testing the slippage of automotive sleeves, characterized in that, The main body (15) includes at least one mutually perpendicular main wall (1) and top wall (2). The main wall (1) is horizontal in the normal direction. A groove (23) is provided on the inner surface of the main wall (1). A test plate (3) that abuts against the toothed end of the workpiece is installed in the groove (23). The workpiece and the test plate (3) are locked to the main wall (1) by a main screw (5). A limiting part is provided on the main wall (1). The limiting part limits the main screw (5) so that it does not rotate during the test. The test plate (3) is also provided with two sets of positioning screws (4). The axis of the positioning screw (4) is at the same horizontal height as the axis of the main screw (5) and locks the test plate (3). The end of the positioning screw (4) located inside the main wall (1) extends with a positioning rod (6). Before the main screw (5) is locked, a pair of positioning plates (7) position the workpiece by positioning rod (6) so that the axis of the workpiece is collinear with the axis of the main screw (5). A pressure part (8) is provided directly above the workpiece to apply pressure or impact force to the workpiece. The limiting part includes an adjusting screw (10) coaxial with the main screw (5). The threaded end of the adjusting screw (10) abuts against the main screw (5) to limit the axial screw advance position of the main screw (5). The different thread parameters of the adjusting screw (10) and the main screw (5) prevent them from rotating synchronously. The contact end faces of the adjusting screw (10) and the main screw (5) are each divided into at least three annular array locking zones (11). The locking zones (11) are annular arrays. Evenly spaced protrusions (12) are provided, protruding from the end face of the adjusting screw (10) or the main screw (5). The spacing between the protrusions (12) in the corresponding locking areas (11) on the adjusting screw (10) and the main screw (5) is different. A locking part is provided on the protrusions (12) in the corresponding locking areas (11) of the adjusting screw (10) and the main screw (5), and the locking part restricts the relative rotation of the adjusting screw (10) and the main screw (5).

2. The automotive sleeve slippage testing fixture according to claim 1, characterized in that: The locking part consists of two wedge-shaped anti-rotation plates (13), which are rotatably connected to a connecting rod (14). The connecting rod (14) is detachably installed on the main body (15).

3. The automotive sleeve slippage testing fixture according to claim 1, characterized in that: The locking part includes a mounting plate (16), on which two sets of arc-shaped sliders (17) are slidably and lockably provided. The two sets of arc-shaped sliders (17) are coaxially corresponding to the ends of the adjusting screw (10) and the main screw (5), respectively. The arc-shaped sliders (17) are connected to locking blocks (18). The two locking blocks (18) contact the protrusions (12) and restrict the relative rotation of the adjusting screw (10) and the main screw (5).

4. The automotive sleeve slippage testing fixture according to claim 3, characterized in that: The outer diameter surface of the arc-shaped slider (17) is a toothed surface, and a worm (19) is provided on the mounting plate (16) to mesh with the toothed surface to form a self-locking adjustment.

5. The automotive sleeve slippage testing fixture according to claim 1, characterized in that: A positioning cylinder (20) is coaxially sleeved on the positioning screw (4). The end face of the positioning cylinder (20) contacts the test plate (3), and the edge size of the groove (23) is larger than that of the test plate (3).

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