Tool, equipment and method for testing tensile strength of conical retainer window

Abstract

The invention discloses a tool, equipment and method for testing the tensile strength of a conical retainer window, and relates to the technical field of retainer performance tests.The tool comprises tension pieces arranged in pairs, stress parts are fixed to one ends of the tension pieces, and the two stress parts are used for being jointly inserted into the conical retainer window; the opposite sides of the two stress parts are connected with first limiting parts, and the first limiting parts are used for limiting the conical retainer in the radial direction; second limiting components are symmetrically installed on the two sides of the tension piece and used for axially limiting the conical retainer. According to the invention, the window of the conical retainer can be limited in multiple directions, so that the conical retainer is kept stable in a snapping test process, and the accuracy of the snapping test can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of cage performance testing, and particularly to a testing tooling, equipment and method for the window breaking force of a tapered cage. Background Art

[0002] The existing methods for testing the breaking force of bearing cages mainly rely on the principle of mechanical tension. During testing, the bearing cage is fixed by a specific testing tooling, and then a pulling force is gradually applied until the cage breaks, so as to obtain the breaking force data. For example:

[0003] Chinese Patent (Publication No. CN220170406U, Publication Date: December 12, 2023) discloses a device for measuring the breaking strength of a bearing cage, which includes a pair of pull rods that can be connected to an external tensile tester; a cage mounting block for mounting the cage to be tested and having a split structure. The two parts of the cage mounting block can be respectively detachably connected to the ends of the two pull rods through connectors. The external tensile tester pulls the pull rods and pulls the two parts of the cage mounting block in opposite directions until the cage to be tested breaks to obtain its breaking strength; since the connector passes through the cage along the axial direction and is connected to the pull rod, and the tapered cage window is arranged in the radial direction of the cage, this solution is not applicable to the window breaking test of the cage.

[0004] Chinese Patent (Publication No. CN219084600U, Publication Date: May 26, 2023) discloses a testing tooling for the breaking force of a bearing cage, which includes two tensile members. The tensile member includes a hook and a fixing part. The two hooks can be respectively inserted into a window and hook the corresponding frame in opposite directions. The fixing part can be connected to the breaking force testing equipment; the testing tooling pulls the fixing parts from both ends through the breaking force testing equipment to move them in a direction away from each other until the frame of the window is broken; in this solution, when the hook cooperates with the cage window and the tensile member is pulled in the opposite direction, the contact position between the hook and the cage window is prone to shaking, affecting the effect of the breaking test.

[0005] Therefore, there is still a problem in the existing cage breaking force testing tooling that the test results are inaccurate due to the shaking or offset of the cage. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a testing tooling and method for the window breaking force of a tapered cage, which can form multi-directional limits on the tapered cage window, keep the tapered cage stable during the breaking test, and ensure the accuracy of the breaking test.

[0007] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a testing tool for the pull - off force of a conical cage window, including a pair of tension members, with a force - receiving member fixed at one end of each tension member, and the two force - receiving members are used to be jointly inserted into the conical cage window; a first limiting member is connected to the opposite sides of the two force - receiving members, and the first limiting member is used for radially limiting the conical cage; second limiting members are symmetrically installed on both sides of the tension members, and the second limiting members are used for axially limiting the conical cage.

[0009] As a further implementation, the force - receiving member is perpendicular to the tension member, and the force - receiving member forms an inner - side limit for the conical cage window.

[0010] As a further implementation, the mating surface of the force - receiving member and the conical cage window is an arc surface.

[0011] As a further implementation, the force - receiving member is connected to the tension member through a connecting member.

[0012] As a further implementation, the first limiting member is perpendicular to the force - receiving member and is connected to the force - receiving member through a connecting member.

[0013] As a further implementation, the second limiting member is in contact with the outer side of the tension member and is connected to the tension member through a connecting member.

[0014] As a further implementation, at least one surface of the tension member is a friction surface.

[0015] In a second aspect, an embodiment of the present invention further provides a testing device for the pull - off force of a conical cage window, including the above - mentioned testing tool.

[0016] As a further implementation, it further includes a tensile testing machine, and the tensile testing machine is connected to the tension members for providing a reverse pulling force to the two tension members.

[0017] In a third aspect, an embodiment of the present invention further provides a testing method for the pull - off force of a conical cage window, using the above - mentioned pull - off force testing device, including:

[0018] Connect the force - receiving member to the tension member, and then insert the force - receiving member into the conical cage window;

[0019] Connect the force - receiving member and the first limiting member, and install the second limiting member;

[0020] Connect the tension member to the tensile testing machine; start the tensile testing machine, and pull the tension member in the opposite direction until the conical cage window breaks.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) The tensile strength test tooling of the present invention includes a tensile member, a force-receiving member, a first limiting member, and a second limiting member. During the tensile strength test, the force-receiving member applies pressure to the window of the tapered cage, while forming a circumferential limit on the tapered cage. The first limiting member forms a radial limit on the tapered cage, and the second limiting member forms an axial limit on the tapered cage. Moreover, the cooperation between the second limiting member and the force-receiving member can prevent the offset of the window of the tapered cage in the axial direction. That is, the cooperation of each component limits the tapered cage in multiple directions, ensuring that the tapered cage does not shake or offset during the tensile test and improving the test accuracy.

[0023] (2) The tensile member of the present invention has a friction surface, which increases the friction force between the tensile member and the tensile testing machine through the friction surface, avoiding the separation between the tensile member and the tensile testing machine during the tensile strength test and ensuring the reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0025] Figure 1 is the assembly of the tensile strength test tooling and the cage according to one or more embodiments of the present invention Figure 1 ;

[0026] Figure 2 is the assembly of the tensile strength test tooling and the cage according to one or more embodiments of the present invention Figure 2 ;

[0027] Figure 3 is the three-dimensional view of the tensile strength test tooling according to one or more embodiments of the present invention;

[0028] Figure 4 is the schematic structural view of the tapered cage.

[0029] Wherein, 1, tensile member; 2, force-receiving member; 3, first limiting member; 4, second limiting member; 5, connecting member; 6, tapered cage; 7, window of the tapered cage; 8, friction surface; 9, mounting surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0031] Embodiment 1:

[0032] As Figure 4As shown, the main function of the window 7 of the tapered cage is to accommodate and guide the rollers, ensuring that the rollers are evenly distributed and rotated smoothly within the bearing; the shape of the window usually matches the shape of the rollers to ensure the best fit and operating performance. The main purpose of the pull-off test is to measure the fracture strength of the window 7 of the tapered cage under the action of a tensile force to evaluate its reliability and durability in practical applications.

[0033] In this embodiment, a pull-off force test tooling for the window of a tapered cage is provided for a tapered cage 6 with a rectangular window, as Figures 1-3 shown. The pull-off force test tooling of this embodiment includes a tensile member 1, a force-receiving member 2, a first limiting member 3, and a second limiting member 4, which form multi-directional limits on the window 7 of the tapered cage, so that the tapered cage 6 remains stable during the pull-off test, ensuring the accuracy of the pull-off test.

[0034] Specifically, as Figure 1 and Figure 3 shown, two tensile members 1 are configured for a single window of the tapered cage 6. The tensile member 1 is a rectangular plate structure as a whole. One side surface is divided into a mounting surface 9 and a tensile surface. The mounting surface 9 is used to cooperate with other components for the installation of the tapered cage 6, and the tensile surface is a friction surface 8. During use, the tensile testing machine is connected to the friction surface 8 to increase the friction force through the friction surface 8, avoiding the separation of the tensile testing machine from the tensile member 1 during the stretching process. The friction surface 8 can be a serrated structure; the mounting surface 9 is a smooth surface without serrations and contacts the tapered cage 6 during the test. [[ID=I4]]

[0035] It can be understood that in other embodiments, both side surfaces of the tensile member 1 can also be set as the friction surface 8.

[0036] The two tensile members 1 are arranged coplanarly, and their mounting surfaces 9 are close to each other. The ends of the mounting surfaces 9 can be in contact with each other or have a certain gap. The force-receiving member 2 is fixedly connected to the tensile member 1 through a connecting member 5 (such as a bolt), which is convenient for disassembly. During the pull-off test, the tensile force is transmitted from the tensile member 1 to the force-receiving member 2, and the force-receiving member 2 applies pressure to the window 7 of the tapered cage.

[0037] As Figure 3As shown, the force-bearing member 2 is perpendicular to the mounting surface 9 of the tensile member 1, and the force-bearing member 2 has a certain height relative to the tensile member 1, so that there is still a certain installation space after the force-bearing member 2 passes through the conical cage window 7. In this embodiment, the force-bearing member 2 is a block structure as a whole, and it satisfies the condition of being able to be inserted and matched with the conical cage window 7. In order to facilitate the insertion into the conical cage window 7, both sides of the force-bearing member 2 are set as arc surfaces, and the arc surfaces are in contact with the inner wall of the conical cage window 7. Two force-bearing members 2 are inserted into the conical cage window 7. During the tensile fracture test, the arc surface of the force-bearing member 2 forms a limit on the inner side of the conical cage window 7, and the surfaces of the two force-bearing members 2 facing each other form a circumferential limit on the conical cage window 7.

[0038] To radially limit the conical cage 6, a first limiting member 3 is provided; to axially and laterally limit the conical cage 6, a second limiting member 4 is provided; as Figure 3 shown, the first limiting member 3 is connected to the force-bearing member 2 through a connecting member 5. The first limiting member 3 is arranged on one side (outer side) opposite to the two force-bearing members 2. The first limiting member 3 is perpendicular to the outer surface of the force-bearing member 2 and has a certain distance from the mounting surface 9 of the tensile member 1, and this distance satisfies the installation of the conical cage 6. The first limiting member 3 corresponds to the boundary of the conical cage window 7 (the partition between the two windows), and can block the movement of the conical cage 6 in the direction perpendicular to the tensile member 1, that is, radial limitation is achieved.

[0039] In this embodiment, the first limiting member 3 is a rectangular block structure, which has a simple structure and is convenient for installation.

[0040] The second limiting member 4 is arranged outside the tensile member 1, and each tensile member 1 is connected to two second limiting members 4; as Figures 1-3 shown, the width of the tensile member 1 is adapted to the thickness of the conical cage 6. Therefore, the second limiting member 4 is arranged to fit the outer wall of the tensile member 1. The second limiting member 4 is connected to the tensile member 1 through a connecting member 5, and the two second limiting members 4 form an axial limiting space for the conical cage 6.

[0041] In this embodiment, the second limiting member 4 is a block structure, and its size is determined according to the model of the conical cage 6.

[0042] As Figure 1As shown in the figure, in this embodiment, two force-bearing components 2 are inserted and fitted with the window 7 of the conical cage. The force-bearing component 2 is connected to the first limiting component 3. A restriction on the boundary partition of the window 7 of the conical cage is formed among the first limiting component 3, the force-bearing component 2, and the tension member 1. Each tension member 1 is connected to a group of second limiting components 4, and each group has two second limiting components 4. The two groups of second limiting components 4 jointly limit the axial direction of the conical cage 6. Therefore, through the tension member 1, the force-bearing component 2, the first limiting component 3, and the second limiting component 4, the window 7 of the conical cage can be effectively limited in multiple directions, ensuring that the conical cage 6 does not shake or shift during the pull-off test, and improving the test accuracy.

[0043] Embodiment 2:

[0044] This embodiment provides a pull-off force test device for the window of a conical cage, which includes the test tooling described in Embodiment 1, and further includes a tensile testing machine. The tensile testing machine is connected to the friction surface 8 of the tension member 1, and provides a reverse pulling force for the two tension members 1 through the tensile testing machine.

[0045] Among them, the tensile testing machine is an existing device for providing tensile force, and its structure will not be elaborated here.

[0046] Embodiment 3:

[0047] This embodiment provides a method for testing the pull-off force of the window of a conical cage, which uses the pull-off force test device described in Embodiment 2, and includes:

[0048] Fix the force-bearing component 2 and the tension member 1 using the connecting piece 5, and then insert the two force-bearing components 2 into the window 7 of the conical cage. Subsequently, fix the first limiting component 3 to the force-bearing component 2 through the connecting piece 5, and install the second limiting component 4 on the outside of the tension member 1 through the connecting piece 5. Adjust each connecting piece 5 to fasten the conical cage 6 to the test tooling.

[0049] Connect the tension member 1 to the tensile testing machine to ensure that the axis of the tension member 1 is consistent with the pulling direction of the tensile testing machine. Start the tensile testing machine, set the test parameters according to the test requirements, pull the tension member 1 in the reverse direction until the window 7 of the conical cage breaks. During the pull-off test, the tensile force is detected in real time through the tensile force sensor. When the window 7 of the conical cage breaks, immediately stop the loading of the tensile testing machine. At this time, record the tensile force value at the moment of fracture, and this tensile force value is the pull-off strength of the window 7 of the conical cage. At the same time, observe the fracture morphology of the window 7 of the conical cage and record information such as the fracture position and fracture mode.

[0050] Of course, other data, such as deformation data and fracture morphology photos, can also be collected during the test to more comprehensively analyze the performance of the conical cage.

[0051] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A testing tool for the breaking force of the window of a conical cage, characterized in that It includes tension members arranged in pairs, with a force-receiving member fixed at one end of each tension member, and the two force-receiving members are used to be jointly inserted into the tapered cage window; a first limiting member is connected to the opposite sides of the two force-receiving members, and the first limiting member is used to radially limit the tapered cage; second limiting members are symmetrically installed on both sides of the tension members, and the second limiting members are used to axially limit the tapered cage.

2. The cone cage window breaking force test tooling according to claim 1, characterized in that The force-receiving member is perpendicular to the tension member, and the force-receiving member forms an inner limit for the tapered cage window.

3. The cone cage window breaking force test tooling according to claim 2, characterized in that The mating surface between the force-receiving member and the tapered cage window is an arc surface.

4. A testing tool for the window breaking force of a conical cage, according to any one of claims 1-3, characterized in that, The force-receiving member is connected to the tension member through a connecting member.

5. A conical cage window breaking force test tooling according to claim 1 or 2, characterized in that The first limiting member is perpendicular to the force-receiving member and is connected to the force-receiving member through a connecting member.

6. A testing fixture for the window breaking force of a conical cage according to claim 1, characterized in that The second limiting member is in contact with the outer side of the tension member and is connected to the tension member through a connecting member.

7. A testing tool for the window breaking force of a conical cage, as claimed in claim 1, wherein At least one side surface of the tension member is a friction surface.

8. A testing device for the tensile breaking force of a conical cage window, characterized in that, It includes the testing tooling according to any one of claims 1-7.

9. The conical cage window breaking force testing device according to claim 8, wherein, It further includes a tensile testing machine, and the tensile testing machine is connected to the tension members and is used to provide reverse tensile forces for the two tension members.

10. A test method for the breaking force of a conical cage window, characterized in that, Adopt the tensile fracture force testing equipment according to claim 9, including: Connect the force-receiving member to the tension member, and then insert the force-receiving member into the tapered cage window. Connect the force-receiving member and the first limiting member, and install the second limiting member. Connect the tension member to the tensile testing machine; start the tensile testing machine and pull the tension member in the opposite direction until the tapered cage window breaks.

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