Pin shearing experiment tool

Abstract

According to the pin shearing experiment tool provided by the utility model, the outer wall of the supporting cylinder is designed to be square, so that the situation that parts and the tool are damaged due to deviation of the direction of force can be avoided whether a positioning pin is mounted or dismounted; and part damage caused by hammering of the positioning pin in the manual installation process is avoided. Through the arrangement, disassembly and assembly in a shear experiment are convenient, positioning is stable, shear pin disassembly is reliable and safe, the experiment efficiency is improved, and meanwhile the experiment reliability is guaranteed. Besides, mounting scale marks and positioning scale marks are adopted as position reference scale marks to achieve accurate positioning in the axial direction and the circumferential direction, the shear pin adopts an end cone to adjust the position of a loading rod, assembly centering is ensured, extra assembly stress of the shear pin caused by miscentering is avoided, the reliability of the device is further improved, and the device is suitable for popularization and application. The method is suitable for large-scale industrial use and popularization.

Description

Technical Field

[0001] The utility model belongs to the field of positioning pin experimental tooling, in particular to a pin shearing experimental tooling. Background Art

[0002] Under certain operating conditions, the countershaft subassembly of a dual-countershaft transmission for commercial vehicles may experience circumferential offset between the countershaft and gears. This can cause the retaining pins, which act as stoppers, to be subjected to corresponding shear and extrusion stresses. When these stresses exceed the material's fatigue limit, the shear pins can severely deform or even crack. This can cause significant gear positional fluctuations, impacting load distribution and gear meshing. Therefore, it was necessary to design a pin shearing tool to study the shear resistance of shear pins with different materials, heat treatments, and diameters.

[0003] The locating pin shear test fixture designed according to the existing standards is not only difficult to assemble and disassemble, but also difficult to ensure the position of the hole during the assembly process. In addition, in the existing locating pin shear test fixture, since the side wall of the support tube is circular, if the locating pin is installed manually during the installation and removal process, the position of the support tube needs to be repeatedly adjusted; if it is installed using a press, once the support tube is radially offset, the pressure will be transmitted to the side wall of the support tube and the loading rod through the locating pin, which can easily cause the fitting position of the fixture and the locating pin to deform. This results in low final experimental efficiency, and the experimental results are difficult to reflect the damage condition of the shear pin under real conditions. Utility Model Content

[0004] The purpose of the utility model is to provide a pin shear test tool to solve the problems in the prior art of low experimental efficiency of positioning pin shear test tool and difficulty in reflecting the damage of the shear pin in the actual state of the experimental results.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A pin shear test fixture includes a shear pin and a loading device, wherein the loading device includes a support tube, the support tube is a square cylinder, and a vertically penetrating loading hole is opened in the middle thereof;

[0007] A loading rod is detachably mounted in the loading hole; a plurality of transverse through holes are formed on the loading rod, and transverse through shear pin mounting holes corresponding to the through holes are formed on the support tube;

[0008] Each of the shear pins can simultaneously penetrate a shear pin mounting hole and a through hole corresponding to the shear pin mounting hole.

[0009] The utility model also has the following features:

[0010] Furthermore, the central axis of any one of the through hole and the shear pin mounting hole does not contact the central axis of the support tube.

[0011] Furthermore, a circle of installation scale lines is provided on the upper part of the loading rod.

[0012] Furthermore, the top surface of the support tube is provided with at least one first positioning scale line;

[0013] The top surface of the loading rod is provided with a second positioning scale line corresponding to the first positioning scale line;

[0014] The first positioning scale line and its corresponding second positioning scale line are located in the same vertical plane.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] (I) The pin shear test fixture of this invention features a square outer wall design for the support tube. This prevents force deviation and damage to parts and fixtures during both installation and removal of the positioning pins. It also prevents damage to parts caused by hammering the positioning pins during manual installation. This design facilitates assembly and disassembly during the shear test, ensures stable positioning, and allows for safe and reliable removal of the shear pins, improving experimental efficiency while ensuring reliability.

[0017] (II) The pin shear test fixture of the present invention can realize shear tests on positioning pins of different diameters by using one set of fixtures, thereby reducing the experimental cost.

[0018] (III) The pin shear test fixture of the present invention uses installation scale lines and positioning scale lines as position reference scale lines to achieve precise axial and circumferential positioning. The shear pin uses an end cone to adjust the position of the loading rod to ensure assembly alignment and avoid additional assembly stress on the shear pin caused by misalignment, further improving the reliability of the device and making it suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the pin shear test tooling of the present utility model;

[0020] Figure 2 This is a cross-sectional view of the pin shear test fixture of the present utility model;

[0021] Figure 3 This is a schematic diagram of the support tube structure in the utility model;

[0022] Figure 4 This is a schematic diagram of the loading rod structure in the utility model;

[0023] Figure 5 It is a schematic diagram of the shear pin structure in the utility model.

[0024] The meaning of the symbols in the figure is:

[0025] 1. Shear pin; 2. Support cylinder; 3. Loading hole; 4. Loading rod; 401, through hole; 5. Shear pin mounting hole; 6. Mounting scale line; 7. First positioning scale line; 8. Second positioning scale line. DETAILED DESCRIPTION

[0026] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art. For example, the shear pins are known and commonly used shear pins.

[0027] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0028] like Figure 1-4 As shown, a pin shear test fixture includes a shear pin 1 and a loading device. The loading device includes a support tube 2. The support tube 2 is a square structure with a vertically penetrating loading hole 3 in the middle.

[0029] The loading rod 4 can be installed in the loading hole 3; the loading rod 4 is provided with a plurality of transverse through holes 401 along the axial direction, and the support cylinder 2 is provided with shear pin mounting holes 5 corresponding to the through holes 401 one by one;

[0030] One shear pin 1 can simultaneously pass through one shear pin mounting hole 5 and the through hole 401 corresponding to the shear pin mounting hole 5 .

[0031] The square outer wall of the support tube 2 in this new pin shear test fixture prevents force deviation and damage to parts and the fixture during both installation and removal of the positioning pin 1. This also prevents damage to parts caused by hammering the positioning pin 1 during manual installation. This design also facilitates assembly and disassembly during shear testing, ensuring stable positioning and reliable and safe removal of the shear pin 1, improving experimental efficiency while ensuring reliability.

[0032] As a preferred solution, the central axes of all through holes 401 and shear pin mounting holes 5 do not contact the central axis of the loading device to ensure the reliability of the experiment.

[0033] As a preferred solution, a circle of installation scale lines 6 is circumferentially provided on the upper portion of the loading rod 4. When installed, the installation scale lines 6 are flush with the top end of the support tube 2.

[0034] Further preferably, at least one first positioning scale line 7 is provided on the top of the support tube 2;

[0035] A corresponding second positioning scale line 8 is provided on the top of the loading rod 4;

[0036] The first positioning scale line 7 and its corresponding second positioning scale line 8 are located in the same vertical plane.

[0037] The installation scale line 6, the first positioning scale line 7 and the second positioning scale line 8 are used as position reference scale lines to achieve precise axial and circumferential positioning, avoiding additional assembly stress of the shear pin 1 caused by misalignment during the experiment, and further improving the reliability of the device.

Claims

1. A pin shear test fixture, comprising a shear pin (1), characterized in that: It also includes a loading device, the loading device includes a support tube (2), the support tube (2) is a square cylinder, and a vertically penetrating loading hole (3) is opened in the middle thereof; A loading rod (4) is detachably mounted in the loading hole (3); a plurality of transverse through holes (401) are provided on the loading rod (4); and transverse through shear pin mounting holes (5) corresponding one-to-one to the through holes (401) are provided on the support tube (2); Each of the shear pins (1) can simultaneously penetrate a shear pin mounting hole (5) and a through hole (401) corresponding to the shear pin mounting hole (5).

2. The pin shear test fixture according to claim 1, characterized in that: The central axis of any one of the through holes (401) and the shear pin mounting hole (5) does not contact the central axis of the support tube (2).

3. The pin shear test fixture according to claim 1, characterized in that: A circle of installation scale lines (6) is provided on the upper part of the loading rod (4).

4. The pin shear test fixture according to claim 1, characterized in that: The top surface of the support tube (2) is provided with at least one first positioning scale line (7); The top end surface of the loading rod (4) is provided with a second positioning scale line (8) corresponding to the first positioning scale line (7); The first positioning scale line (7) and the corresponding second positioning scale line (8) are located in the same vertical plane.

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