Release force detection tool for mounting bushing of automobile steering device

Abstract

The utility model discloses an automobile steering gear installation bushing stripping force detection tool comprising a pressure head, a guide column, a guide block and a pedestal, the pedestal is internally provided with a through hole extending up and down, the upper part of the through hole is provided with a circle of sinking platform, the guide block is supported on the sinking platform and is limited in the through hole in the circumferential direction, and the guide block is provided with a through hole extending up and down. The guide column comprises an upper section and a lower section, the upper section and the lower section are in step transition, the diameter of the lower section is matched with the hole diameter of the through hole, the diameter of the upper section is smaller than that of the lower section, the upper section is matched with the inner diameter of the installation lining base body, the upper section is sleeved with the installation lining base body, and the outer diameter of the installation lining base body is consistent with the diameter of the lower section. The bottom face of the pressing head abuts against the top face of the installation lining base body and the top face of the installation lining rubber. The stripping force detection tool for the mounting bushing overcomes the defects of the existing stripping force detection tool for the mounting bushing, improves the accuracy and reliability of detection, and ensures the quality and performance of the mounting bushing.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering system technology, and in particular to a tooling for detecting the peel force of automotive steering system mounting bushings. Background Technology

[0002] In automobile design and manufacturing, the steering system, as a critical control component, directly affects the vehicle's driving safety and handling stability. The mounting bushing used at the connection between the steering system and the subframe plays a vital role in this system. The mounting bushing typically consists of a mounting bushing base and mounting bushing rubber covering the outer circumference of the base. This structural design offers several advantages, most notably its ability to effectively reduce quality issues such as abnormal noises caused by steering system vibration. Therefore, rigorous testing of the mounting bushing's performance is crucial for ensuring product quality. Among the many performance indicators of the mounting bushing, the peel force between the rubber and the metal frame (i.e., the mounting bushing base) is a critical test item. The magnitude of the peel force reflects the bonding strength between the rubber and the metal frame; if the peel force is too low, it means that the bond between the rubber and the metal frame is weak, seriously threatening vehicle driving safety. However, current methods for testing the peel force between the mounting bushing rubber and the metal frame have significant limitations. Currently, the main testing method involves inspectors using a knife to objectively assess the bonded area. This method has several drawbacks. First, it cannot directly and accurately measure the actual peel force between the rubber and the metal skeleton; it can only roughly judge the bond strength by observing the damage to the bonded area. This judgment method lacks scientific rigor and precision, and is easily influenced by the subjective factors of the testing personnel, leading to significant errors in the test results. Second, the knife-based evaluation method cannot directly test the peel force, making it difficult to simulate the forces that the bushing would experience during actual use, and thus failing to accurately reflect its performance under real-world conditions. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model aims to provide a tooling for detecting the peel force of automotive steering gear mounting bushings, thereby overcoming the shortcomings of existing mounting bushing peel force detection devices, improving the accuracy and reliability of detection, and ensuring the quality and performance of the mounting bushings.

[0004] To achieve the above objectives, this utility model proposes a tooling for testing the peel force of an automotive steering gear mounting bushing. The mounting bushing includes a mounting bushing base and mounting bushing rubber covering the outer circle of the mounting bushing base. The testing tooling includes a pressure head, a guide post, a guide block, and a base. The base has a vertically extending through hole inside, and a countersunk platform is provided on the upper part of the through hole. The guide block is supported on the countersunk platform and circumferentially confined within the through hole. The guide block has a vertically extending through hole. The guide post includes upper and lower sections with a stepped transition. The diameter of the lower section matches the diameter of the through hole, and the diameter of the upper section is smaller than the diameter of the lower section and matches the inner diameter of the mounting bushing base. The mounting bushing base is sleeved on the upper section, and its outer diameter is the same as the diameter of the lower section. The bottom end of the pressure head is fixedly connected to the top end of the guide post, and the bottom surface of the pressure head abuts against the top surface of the mounting bushing base and the mounting bushing rubber.

[0005] In the above solution: the through hole inside the base includes upper and lower parts, which are stepped and transitioned together. The diameter of the upper part is larger than that of the lower part, thereby forming a recessed platform on the inner wall of the base. The structure is simple and easy to process, and at the same time, it can provide a stable and reliable support structure for the guide block.

[0006] In the above scheme: the guide block includes upper and lower parts, which are stepped and transitioned. The diameter of the upper part of the guide block matches the diameter of the upper part of the through hole, and the diameter of the lower part of the guide block matches the diameter of the lower part of the through hole. The guide block is supported on the sink platform by its steps, which helps to ensure the accurate installation position of the guide block in the base, thereby ensuring the stability and reliability of the entire testing fixture.

[0007] In the above scheme: the distance between the bottom surface of the guide post and the bottom surface of the base is greater than the axial length of the mounting bushing base, so as to avoid the guide post's downward stroke being restricted, and to ensure that the mounting bushing base can be fully pressed into the through hole of the guide block, thereby ensuring that the mounting bushing rubber can be completely peeled off.

[0008] In the above scheme, the through hole is located at the center of the guide block, which is simple in structure, convenient in layout, and more conducive to ensuring the stability of the entire testing fixture.

[0009] In the above scheme: the indenter has an inverted T-shaped cross-section, with a through hole extending vertically at its center. The top of the guide post has an external thread, and the bottom of the through hole has an internal thread that matches the external thread. The external and internal threads mate to achieve a fixed connection between the bottom of the indenter and the top of the guide post. This connection method is simple and robust, ensuring that the indenter and guide post will not loosen or separate during the testing process. This ensures that the force is transmitted stably and accurately, improving the stability and reliability of the testing.

[0010] In the above scheme, the materials for the pressure head, guide column, guide block and base are diverse. Medium carbon steel or alloy steel with high hardenability, such as 45 steel and 40Cr, can be selected. Alternatively, low carbon steel with lower hardenability and hardenability, such as 20 steel, can be preferred. After quenching and tempering, 20 steel has high strength, hardness, good plasticity and toughness, and good comprehensive mechanical properties.

[0011] The beneficial effects of this utility model are:

[0012] 1. The countersunk platform within the base's through-hole provides support and circumferential restraint for the guide block. The design of the guide post with its two sections of different diameters allows for precise alignment with the guide block's through-hole and the mounting bushing base. The mounting bushing base is accurately fitted onto the upper section of the guide post, laying a stable foundation for subsequent peel force testing. This ensures accurate and stable positioning of all components during testing, improving accuracy and reliability. 2. Operation is simple. Operators only need to correctly place the mounting bushing on the guide post and connect the pressure head to the guide post to perform peel force testing. 3. This testing fixture has a certain degree of versatility. By replacing guide posts and guide blocks of different sizes and specifications, it can adapt to the peel force testing needs of mounting bushings with different hole diameters (the pressure head and base are universal). 4. High testing efficiency. It can quickly complete peel force testing of a large number of mounting bushings, reducing testing time and labor costs. Furthermore, its versatility and reusability also reduce the company's equipment procurement and maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] like Figure 1 As shown, a tooling for testing the peel force of an automotive steering gear mounting bushing mainly consists of a pressure head 1, a guide post 4, a guide block 5, and a base 6. The mounting bushing includes a mounting bushing base 2 and mounting bushing rubber 3 covering the outer circumference of the mounting bushing base 2.

[0015] The base 6 has a through hole extending vertically inside, with a countersunk platform at the top of the through hole. The guide block 5 is supported on the countersunk platform and circumferentially confined within the through hole. The guide block 5 has a through hole extending vertically. The guide post 4 consists of two sections, upper and lower, with a stepped transition. The diameter of the lower section matches the diameter of the through hole, while the diameter of the upper section is smaller than that of the lower section and matches the inner diameter of the mounting bushing base 2. The mounting bushing base 2 is fitted over the upper section, and its outer diameter is the same as that of the lower section. The bottom end of the pressure head 1 is fixedly connected to the top end of the guide post 4, and the bottom surface of the pressure head 1 abuts against the top surface of the mounting bushing base 2 and the mounting bushing rubber 3.

[0016] The diameter of the lower section of the guide post 4 matches the diameter of the through hole, and the outer diameter of the mounting bushing base 2 is consistent with the diameter of the lower section of the guide post 4. This means that the lower section of the guide post 4 and the mounting bushing base 2 can pass through the through hole.

[0017] Ideally, the through hole inside the base 6 consists of two parts, upper and lower, with a stepped transition between them. The diameter of the upper part is larger than that of the lower part, thus forming a recessed platform on the inner wall of the base 6. This design is simple, easy to process, and provides a stable and reliable support structure for the guide block 5.

[0018] Ideally, the guide block 5 comprises two parts, upper and lower, with a stepped transition between them. The diameter of the upper part of the guide block 5 matches the diameter of the upper part of the through hole, and the diameter of the lower part of the guide block 5 matches the diameter of the lower part of the through hole. The guide block 5 is supported on the recessed platform by its steps, which helps to ensure the accurate installation position of the guide block 5 in the base 6, thereby ensuring the stability and reliability of the entire testing fixture.

[0019] Ideally, the distance between the bottom surface of the guide post 4 and the bottom surface of the base 6 should be greater than the axial length of the mounting bushing base 2, so as to avoid limiting the downward stroke of the guide post 4, ensure that the mounting bushing base 2 can be fully pressed into the through hole of the guide block 5, and thus ensure that the mounting bushing rubber 3 can be completely peeled off.

[0020] Ideally, the through hole should be located at the center of the guide block 5. This design is simple, easy to install, and more conducive to ensuring the stability of the entire testing fixture.

[0021] Ideally, the pressure head 1 has an inverted T-shaped cross-section, with a through hole extending vertically at its center. The top of the guide post 4 has an external thread, and the bottom of the through hole has an internal thread that matches the external thread. The external and internal threads mate to achieve a fixed connection between the bottom of the pressure head 1 and the top of the guide post 4. This connection method is simple and robust, ensuring that the pressure head 1 and the guide post 4 will not loosen or separate during the testing process. This ensures that the force is transmitted stably and accurately, which is beneficial to improving the stability and reliability of the test.

[0022] Ideally, the materials for the pressure head 1, guide column 4, guide block 5, and base 6 should be diverse. Medium carbon steel or alloy steel with high hardenability, such as 45 steel or 40Cr, can be selected. Alternatively, low carbon steel with lower hardenability and hardenability, such as 20 steel, can be preferred. After quenching and tempering, 20 steel has high strength, hardness, good plasticity and toughness, and good comprehensive mechanical properties.

[0023] The method of using this utility model is as follows: Install the mounting bushing and peel force testing fixture onto the universal electronic testing instrument, apply downward pressure F to the pressure head 1, press down until the mounting bushing rubber 3 and the mounting bushing substrate 1 are completely peeled off, observe the pressure curve displayed on the universal electronic testing instrument, and take the most stable force as the average peel force. The universal electronic testing instrument consists of: a measurement system (displacement and torque sensors), a drive system (servo motor), a control (control chip) system, and a computer (display and storage system).

Claims

1. A stripping force detection tool for a steering gear mounting bushing of an automobile, the mounting bushing comprising a mounting bushing base (2) and a mounting bushing rubber (3) coated on an outer circumference of the mounting bushing base (2), characterized in that: The testing fixture includes a pressure head (1), a guide post (4), a guide block (5), and a base (6). The base (6) has a through hole extending vertically inside. A countersunk platform is provided on the upper part of the through hole. The guide block (5) is supported on the countersunk platform and is circumferentially confined in the through hole. The guide block (5) has a through hole extending vertically. The guide post (4) includes two sections, upper and lower, which are stepped. The diameter of the lower section matches the diameter of the through hole, and the diameter of the upper section is smaller than the diameter of the lower section and matches the inner diameter of the mounting bushing base (2). The mounting bushing base (2) is sleeved on the upper section, and its outer diameter is the same as the diameter of the lower section. The bottom end of the pressure head (1) is fixedly connected to the top end of the guide post (4), and the bottom surface of the pressure head (1) abuts against the top surface of the mounting bushing base (2) and the mounting bushing rubber (3).

2. The peel force detection tool for a steering gear mounting bushing of an automobile according to claim 1, characterized by: The through hole inside the base (6) consists of two parts, upper and lower, which are stepped and transitioned together. The diameter of the upper part is larger than that of the lower part, thus forming a recessed platform on the inner wall of the base (6).

3. The peel force detection tool for a steering gear mounting bushing of an automobile according to claim 2, characterized in that: The guide block (5) comprises two parts, upper and lower, which are stepped. The diameter of the upper part of the guide block (5) matches the diameter of the upper part of the through hole, and the diameter of the lower part of the guide block (5) matches the diameter of the lower part of the through hole. The guide block (5) is supported on the sinking platform by its steps.

4. The peel force detection tool for a steering gear mounting bushing of an automobile according to claim 1, characterized by: The distance between the bottom surface of the guide post (4) and the bottom surface of the base (6) is greater than the axial length of the mounting bushing base (2).

5. The peel force detection tool for a steering gear mounting bushing of an automobile according to claim 1, characterized by: The through hole is located at the center of the guide block (5).

6. The peel force detection tool for a steering gear mounting bushing of an automobile according to claim 5, characterized by: The cross-section of the pressure head (1) is inverted T-shaped. The center of the pressure head (1) is provided with a through hole extending vertically. The top of the guide post (4) is provided with an external thread, and the bottom of the through hole is provided with an internal thread that matches the external thread. The external thread and the internal thread cooperate to achieve a fixed connection between the bottom of the pressure head (1) and the top of the guide post (4).

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