Tool for testing pull-out force of bushing gasket

Abstract

The utility model discloses a bushing gasket pull-out force test tool, which is composed of a bottom tool and a top tool, the bottom tool comprises a mandrel, a spring expansion sleeve and a lower adapter plate, and the spring expansion sleeve is fixed at the center of the lower adapter plate through a lower cylindrical screw; the bushing inner pipe is sleeved on the spring expansion sleeve; the core shaft penetrates through the lining inner pipe to be installed in the spring expansion sleeve, and the upper end of the spring expansion sleeve is located above a lower gasket of the lining inner pipe; the top tool comprises an upper adapter disc, an adapter, a supporting column, a special nut, an upper cylindrical screw and a clamping head. The adapter is fixed in the upper adapter plate through a positioning pin; the supporting column is arranged below the adapter; and the lower half part of the clamping head is arranged in the supporting column. The bushing gasket pull-out force test tool can rapidly complete a bushing gasket pull-out force test and check interference connection between the gasket and a bushing inner pipe, and is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to a test tool for the pull-off force of a bushing gasket. Background Technique

[0002] Please refer to Figure 1 and Figure 2 , a bushing commonly used in an automotive chassis generally includes an inner bushing tube 1', a bushing rubber body, and an outer bushing tube 2'. The bushing assembly is assembled in a spreader bracket 3' by bolts 4'. Bolt connection is one of the most widely used detachable connection methods in the current automotive chassis. To ensure the reliability of the threaded connection body and enable it to normally perform its use functions, it is necessary to ensure that the threaded connection reaches the initial pre-tightening force. When the tightening torque increases, the axial pre-tightening force on the inner bushing tube 1' increases accordingly. To ensure that the increased pre-tightening force does not cause the inner bushing tube 1' to be crushed, strength verification is required. Considering that it is necessary to simultaneously meet the bushing size and performance requirements, but the design of the inner bushing tube 1' cannot guarantee the strength. The anti-crushing ability can be improved by assembling steel gaskets 5' at the upper and lower ends of the inner bushing tube 1', or the friction coefficient can be increased by knurling or adding teeth. To ensure that the gasket 5' does not fall off during transportation and before loading, a suitable test tool is required to verify the interference connection between the gasket 5' and the inner bushing tube 1'. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a test tool for the pull-off force of a bushing gasket, which can quickly complete the pull-off force test of the bushing gasket, verify the interference connection between the gasket and the inner bushing tube, and has a simple structure and convenient operation.

[0004] The technical solution for realizing the above purpose is: a test tool for the pull-off force of a bushing gasket, which is composed of a bottom tool and a top tool. The top tool and the bottom tool respectively correspond to the upper and lower gaskets of the inner bushing tube, wherein:

[0005] The bottom tool includes a mandrel, a spring expansion sleeve, and a lower adapter plate. The spring expansion sleeve is fixed at the center of the lower adapter plate by a lower cylindrical screw; the inner bushing tube is sleeved on the spring expansion sleeve; the mandrel passes through the inner bushing tube and is installed in the spring expansion sleeve, and the upper end of the spring expansion sleeve is located above the lower gasket of the inner bushing tube;

[0006] The top tooling includes an upper adapter plate, an adapter, a support column, a special nut, an upper cylindrical screw, and a clamping head; the adapter is fixed in the upper adapter plate through a positioning pin; the support column is arranged below the adapter; the interior of the support column is hollow, the interior of the clamping head is hollow, and the lower half of the clamping head is arranged in the support column; the upper cylindrical screw sequentially passes through the central hole of the adapter and the central hole of the clamping head, and the special nut is fastened to the bottom end of the upper cylindrical screw; the support column is inserted into the inner tube of the bushing, and the upper gasket of the inner tube of the bushing is located above the lower end of the clamping head.

[0007] In the above-mentioned bushing gasket pull-off force test tooling, the upper end of the spring expansion sleeve abuts against the root of the lower gasket to form an undercut; the lower end of the clamping head abuts against the root of the upper gasket to form an undercut.

[0008] In the above-mentioned bushing gasket pull-off force test tooling, the upper part of the special nut is conical, the lower end of the central hole of the clamping head is conical, and the upper part of the special nut is inserted into the lower end of the central hole of the clamping head.

[0009] In the above-mentioned bushing gasket pull-off force test tooling, the clamping head is surrounded by four clamping blocks.

[0010] In the above-mentioned bushing gasket pull-off force test tooling, the lower adapter plate is fixed on the platform of the tensile testing machine through bolts; the upper adapter plate is fixed on the top plate of the tensile testing machine.

[0011] The bushing gasket pull-off force test tooling of the present utility model can quickly complete the bushing gasket pull-off force test, check the interference connection between the gasket and the inner tube of the bushing, and has a simple structure and convenient operation. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a bushing commonly used in an automotive chassis;

[0013] Figure 2 It is a schematic structural diagram of a bushing assembly with a gasket assembled;

[0014] Figure 3 It is a schematic structural diagram of the bushing gasket pull-off force test tooling of the present utility model;

[0015] Figure 4 It is a schematic structural diagram of a spring expansion sleeve;

[0016] Figure 5 It is a schematic connection diagram of a support column, a clamping head, and a special nut. Detailed Embodiments

[0017] In order to enable those skilled in the art of this technology to better understand the technical solution of this utility model, the following will describe its specific implementation manners in detail with reference to the accompanying drawings:

[0018] Please refer to Figure 3 、 Figure 4 and Figure 5 , the best embodiment of this utility model, a test tool for the pulling-off force of a bushing gasket, which is composed of a bottom tooling and a top tooling. The top tooling and the bottom tooling respectively correspond to the upper gasket 101 and the lower gasket 102 of the inner tube 100 of the bushing.

[0019] The bottom tooling includes a mandrel 6, a spring expansion sleeve 7 and a lower adapter plate 8. The spring expansion sleeve 7 is fixed at the center of the lower adapter plate 8 by a lower cylindrical screw K2; the inner tube 100 of the bushing is sleeved on the spring expansion sleeve 7; the mandrel 6 is inserted into the upper end opening of the inner tube 100 of the bushing, passes through the inner tube 100 of the bushing and is installed in the spring expansion sleeve 7, and the upper end of the spring expansion sleeve 7 is located above the lower gasket 102 of the inner tube 100 of the bushing. The upper end of the spring expansion sleeve 7 abuts against the root of the lower gasket 102 to form an undercut.

[0020] The top tooling includes an upper adapter plate 1, an adapter 2, a support column 3, a special nut 5, an upper cylindrical screw K1 and a clamping head 4; the adapter 2 is fixed in the upper adapter plate 1 by a positioning pin 9; the support column 3 is arranged below the adapter 2; the inside of the support column 3 is hollow, the inside of the clamping head 4 is hollow, and the lower half of the clamping head 4 is arranged in the support column 3; the upper cylindrical screw K1 sequentially passes through the central hole of the adapter 2 and the central hole of the clamping head 4, and the special nut 5 is fastened to the bottom end of the upper cylindrical screw K1; the support column 3 is inserted into the inner tube 100 of the bushing, and the upper gasket 101 of the inner tube 100 of the bushing is located above the lower end of the clamping head 4. The lower end of the clamping head 4 abuts against the root of the upper gasket 101 to form an undercut.

[0021] The adapter 2, the support column 3 and the clamping head 4 are fastened together by the upper cylindrical screw K1 and the special nut 5. The upper part of the special nut 4 is conical, the lower end of the central hole of the clamping head 4 is conical, and the upper part of the special nut 5 is inserted into the lower end of the central hole of the clamping head 4. The clamping head 4 is surrounded by four clamping blocks.

[0022] For the bushing gasket pull-off force test tool of the present utility model, during use, the lower adapter plate 8 is fixed on the platform of the tensile testing machine by bolts; the upper adapter plate 1 is fixed on the top plate of the tensile testing machine. When the tensile testing machine operates, the top plate drives the special nut 5 to move upward, pushing the clamping head 4 upward. The lower end of the clamping head 4 contacts the root of the lower gasket 101 and abuts against the root of the upper gasket 101 to form an inverted buckle. As the force value increases, the upper gasket 101 can be pulled off. At the same time, the upper end of the spring expansion sleeve 7 abuts against the root of the lower gasket 102 to form an inverted buckle, preventing the lower gasket 102 from moving upward with the bushing. When a certain force value is reached, the lower gasket 102 can be pulled off. The upper gasket 101 and the lower gasket 102 may be pulled off simultaneously, or one end may be pulled off first, and then the test stops, so as to obtain the minimum force value required for the gasket to be pulled off, and further check the interference connection between the gasket and the inner tube of the bushing.

[0023] In summary, the bushing gasket pull-off force test tool of the present utility model can quickly complete the bushing gasket pull-off force test, check the interference connection between the gasket and the inner tube of the bushing, and has a simple structure and convenient operation.

[0024] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. As long as it is within the scope of the essential spirit of the present utility model, changes and modifications to the above embodiments will fall within the scope of the claims of the present utility model.

Claims

1. A test tool for the pulling-off force of a bushing gasket, characterized in that, It is composed of a bottom tooling and a top tooling. The top tooling and the bottom tooling respectively correspond to the upper and lower gaskets of the bushing inner tube, where: The bottom tooling includes a mandrel, a spring expansion sleeve, and a lower adapter plate. The spring expansion sleeve is fixed at the center of the lower adapter plate by a lower cylindrical screw; the bushing inner tube is sleeved on the spring expansion sleeve; the mandrel passes through the bushing inner tube and is installed in the spring expansion sleeve, and the upper end of the spring expansion sleeve is located above the lower gasket of the bushing inner tube; The top tooling includes an upper adapter plate, an adapter, a support column, a special nut, an upper cylindrical screw, and a clamping head; the adapter is fixed in the upper adapter plate by a positioning pin; the support column is arranged below the adapter; the inside of the support column is hollow, the inside of the clamping head is hollow, and the lower half of the clamping head is arranged in the support column; the upper cylindrical screw sequentially passes through the central hole of the adapter and the central hole of the clamping head, and the special nut is fastened to the bottom end of the upper cylindrical screw; the support column is inserted into the bushing inner tube, and the upper gasket of the bushing inner tube is located above the lower end of the clamping head.

2. The pull-off force test tooling for a bushing gasket according to claim 1, characterized in that, The upper end of the spring expansion sleeve abuts against the root of the lower gasket to form an inverse buckle; the lower end of the clamping head abuts against the root of the upper gasket to form an inverse buckle.

3. The pull-off force test tooling for a bushing gasket according to claim 1, characterized in that, The upper part of the special nut is conical, the lower end of the central hole of the clamping head is conical, and the upper part of the special nut is inserted into the lower end of the central hole of the clamping head.

4. The pull-off force test tooling for a bushing gasket according to claim 1, characterized in that, The clamping head is surrounded by four clamping blocks.

5. The bushing gasket pull-off force test tooling according to claim 1, characterized in that, The lower adapter plate is fixed on the platform of the tensile testing machine by bolts; the upper adapter plate is fixed on the top plate of the tensile testing machine.

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