Device for stretching bearing retainer and tensile strength testing method

Abstract

The invention discloses a device for stretching a bearing retainer and a tensile strength test method, solves the problem of non-uniform stress of the bearing retainer in the tensile strength test process of the bearing retainer in the prior art, and has the beneficial effects of uniform stress and guarantee of the accuracy of a measurement result. Comprising multiple sections of tools, every two adjacent tools in the multiple sections of tools are connected in a clamped mode and spliced into an annular piece, the annular piece can be arranged on the inner side of the bearing retainer and attached to the inner side face of the bearing retainer, and the shape of the annular piece is consistent with that of the bearing retainer; part or all of the tools are hollowed out, a convex part is arranged on one side, far away from the outer side surface, of the annular piece, an open hole is formed in the convex part and is formed in the axial direction of the annular piece, the connecting piece penetrates through the handle and the open hole in the convex part, and the handle can be connected with tensile test equipment; a baffle plate is arranged at the end part of the annular piece, so that the bearing retainer is prevented from falling off in the tensile test process.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a bearing retainer stretching device and a breaking force testing method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Bearing retainers, especially tapered bearing retainers, need to undergo a breaking force performance test during the production process to ensure that the retainer strength meets the requirements. The inventors found that in the prior art, in order to achieve the breaking force performance test, an integrally formed tensile test tool is selected to be placed inside the bearing retainer. When the bearing retainer is heavy, the mass of the integrally formed tensile test tool is also heavy, the production cost is high, and there is a problem of waste of resources; and there is no guide during the breaking force test, resulting in uneven tension, which not only leads to inaccurate breaking force performance test results, but also the risk of the bearing retainer breaking during subsequent use of the bearing. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a bearing retainer stretching device to ensure that the device and the bearing retainer are subjected to uniform force during the tensile test and to ensure the accuracy of the breaking force test results.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A device for stretching a bearing retainer includes multiple sections of tooling, wherein adjacent two sections of tooling are snap-connected and assembled into an annular member. The annular member can be placed inside the bearing retainer and fit in place with the inner side surface of the bearing retainer. The shape of the annular member is consistent with the shape of the bearing retainer. Some or all of the tooling is hollowed out. A convex portion is provided on a side of the annular member away from its outer side surface. An opening is provided at the convex portion. The opening is arranged along the axial direction of the annular member. A connecting member passes through a handle and the convex opening. The handle can be connected to a tensile testing device.

[0007] A baffle is provided at the end of the annular member to prevent the bearing retainer from falling during the tensile strength test.

[0008] In the above-mentioned device for stretching a bearing retainer, the baffle is fixedly connected to one end of the annular member by a fastener, and the fastener is detachably arranged relative to the baffle and the annular member, so that after the annular member is arranged on the inner side of the bearing retainer, the baffle is fixed to one end of the annular member. After the tensile test is completed, the baffle is removed by removing the fastener, and then the multiple sections of tooling are taken out for recycling;

[0009] The mutual matching clearance between two adjacent tooling clamping connections is 0.1-0.4mm.

[0010] In the above-mentioned device for stretching a bearing retainer, the annular member is a conical member suitable for stretching a tapered bearing retainer, and the baffle is fixed to the end of the annular member with a smaller diameter;

[0011] The thickness of the annular member is adapted to the thickness of the bearing retainer, the gap between the annular member and the inner side surface of the bearing retainer is 0.2-0.8 mm, the height of the annular member can be greater than, equal to, or less than the height of the bearing retainer, and 5 cm larger or smaller than the thickness of the bearing retainer to ensure the smooth progress of the tensile test.

[0012] In the above-mentioned device for stretching a bearing retainer, the baffle is an annular member and does not affect the connection between the connecting member and the convex opening;

[0013] The outer diameter of the baffle is greater than or equal to the outer diameter of one end of the bearing retainer, and arc grooves are respectively provided on the inner side surface of the baffle at positions corresponding to the convex parts.

[0014] The device for stretching a bearing retainer as described above, wherein the tooling is provided at two locations, namely a first tooling and a second tooling, the first tooling and the second tooling are both hollowed out, and the first tooling and the second tooling are butted and engaged;

[0015] The first tooling and the second tooling are both semicircular ring components.

[0016] As described above, in a device for stretching a bearing retainer, the first tooling and the second tooling both include a tooling body, and the inner side walls of the tooling bodies are both provided with hollow support plates, the support plates are arranged along the radial direction of the first tooling or the second tooling, the first support plate at the first tooling is provided with a protrusion or groove on the side facing the second tooling, and the second support plate at the second tooling is snap-connected with the first support plate.

[0017] In the above-mentioned bearing retainer stretching device, the support plate is provided with clamping blocks on both sides of the groove facing the other tooling, and the support plate is provided with clamping grooves on both sides of the protrusion to respectively engage with the clamping blocks at the two locations of the groove;

[0018] The length of the protrusion is greater than that of the clamping block, and the length of the protrusion is greater than the width of the support plate on which the protrusion is located.

[0019] In the above-mentioned device for stretching a bearing retainer, the inner side walls of the first tooling and the second tooling are both provided with the convex parts, and the plane where the central axes of the openings of the two convex parts are located passes through the central axis of the annular member.

[0020] In the bearing retainer stretching device as described above, the handle is a U-shaped handle, the width of the U-shaped handle is greater than the thickness of the bearing retainer, a stretching rod is provided at one end of the U-shaped handle, and anti-slip grooves are provided on the side of the stretching rod.

[0021] In the bearing retainer stretching device described above, the connecting member is a pin, which passes through one side of the U-shaped handle, the convex opening, and the other side of the U-shaped handle in sequence, and the pin serves to connect the handle and the annular member.

[0022] On the other hand, the present invention also provides a method for testing the tensile strength of a bearing retainer, which uses the aforementioned bearing retainer stretching device and includes the following contents:

[0023] Place the tooling on the inside of the bearing cage and assemble multiple tooling sections into a ring-shaped piece;

[0024] The handle is placed on the bearing retainer, the handle corresponds to the position of the protrusion of the annular member, the connecting member passes through the handle and the opening of the protrusion, and the handle is connected to the tensile testing equipment;

[0025] The tensile testing equipment is turned on to provide a set tensile force to the handle. The bearing retainer is pulled outward through the handle and the ring. The tensile force is gradually increased to observe whether the bearing retainer is broken.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1) The present invention uses multiple sections of tooling to assemble into an annular part, which is convenient for processing and manufacturing. In addition, some or all of the tooling is hollowed out to reduce the mass of the annular part and save resources. The two adjacent sections of tooling are connected by snapping together, and the snapping part plays a guiding role, ensuring that the force on the device and the bearing retainer is uniform during the tensile test, thereby ensuring the accuracy of the tensile strength test results.

[0028] 2) In the present invention, a baffle is provided at the end of the annular member to limit one end of the bearing retainer to prevent the bearing retainer from falling during the tensile strength test.

[0029] 3) The present invention is provided with two toolings, a first tooling and a second tooling, which are convenient for processing and for snap-fitting connection inside the bearing retainer. The first tooling and the second tooling have similar structures. A protrusion or a groove is provided at the support plate to facilitate the snap-fit ​​connection between the two, and play a guiding role during the tensile strength test to ensure that the device is evenly stressed.

[0030] 4) In the present invention, the first tooling and the second tooling are both semi-circular ring components. The first tooling and the second tooling not only achieve effective engagement through the structural cooperation of the protrusion and the groove, but also play a guiding role. In addition, grooves are set on both sides of the protrusion, and blocks that cooperate with the grooves are set on both sides of the groove. In this way, the length of the protrusion can be guaranteed, and the guiding role of the protrusion and the groove is further guaranteed, which effectively ensures that the force on the device and the bearing retainer is uniform during the test, and will not affect the subsequent use of the bearing retainer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0032] Figure 1 A schematic diagram of a bearing retainer stretching device according to one or more embodiments of the present invention Figure 1 .

[0033] Figure 2 A schematic diagram of a bearing retainer stretching device according to one or more embodiments of the present invention Figure 2 .

[0034] Figure 3 The present invention is a bearing retainer stretching device according to one or more embodiments of the present invention. Figure 3 .

[0035] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0036] Including: 1. Tooling, 2. Connectors, 3. Handles, 4. Bearing Cages, 5. Baffles, 6. Fasteners;

[0037] 1-1. convex portion, 1-2. support plate, 1-21. arc segment, 1-22. straight plate segment, 1-23. clamping block, 1-3. convex block, 1-4. first tooling, 1-5. second tooling;

[0038] 3-1. Anti-slip texture;

[0039] 5-1. Arc groove. DETAILED DESCRIPTION

[0040] 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 skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0042] As introduced in the background technology, in the prior art, the bearing retainer suffers from uneven force during the tensile strength test of the bearing retainer. In order to solve the above technical problem, the present invention proposes a bearing retainer stretching device.

[0043] Example 1

[0044] In a typical embodiment of the present invention, referring to Figure 1 As shown, a device for stretching a bearing retainer includes a multi-segment tool 1, wherein two adjacent toolings in the multi-segment tool 1 are snap-connected and assembled into an annular member. The annular member can be placed inside the bearing retainer and fit in place with the inner side surface of the bearing retainer. The shape of the annular member is consistent with the shape of the bearing retainer 4. Part or all of the tooling 1 is hollowed out, and a convex portion 1-1 is provided on a side of the annular member away from its outer side surface. The convex portion is provided with an opening, and the opening is arranged along the axial direction of the annular member. A connecting member 2 is provided through a handle and the convex opening. The handle 3 can be connected to a tensile testing device.

[0045] A baffle 5 is provided at the end of the annular member to prevent the bearing retainer from falling during the tensile strength test.

[0046] It should be explained that the baffle 5 is fixedly connected to one end of the annular member by multiple fasteners 6. A threaded hole is provided on the end side of the annular member, and a through hole corresponding to the position of the threaded hole is provided on the baffle. The fastener can be a screw. The fastener passes through the through hole and is connected to the threaded hole. The fastener is detachable relative to the baffle 5 and the annular member. After the annular member is set on the inner side of the bearing retainer, the baffle is fixed to one end of the annular member. After the tensile test is completed, the baffle is removed by removing the fasteners, and then the multiple sections of tooling are taken out for recycling.

[0047] It should be noted that the mutual fitting clearance between the engaging connections of two adjacent tooling pieces is 0.1-0.4 mm.

[0048] It is easy to understand that the device provided in this embodiment can be used for the tensile strength test of circular bearing retainers, in which case the outer side of the ring is cylindrical; it can also be used for the tensile strength test of tapered bearing retainers, in which case the outer side of the ring is tapered.

[0049] It can be understood that when the outer side surface of the ring is conical, in order to be suitable for stretching the tapered bearing retainer, the baffle is fixed to the end of the ring with a smaller diameter; when the outer side surface of the ring is cylindrical, the baffle can be fixed to both ends of the ring.

[0050] It is easy to understand that the height of the annular member is adapted to the height of the bearing retainer 4, the outer diameter of the annular member is less than or equal to the inner diameter of the bearing retainer, and the gap between the annular member and the inner side surface of the bearing retainer is 0.2-0.8 mm. Specifically, the height of the annular member may be greater than, equal to, or less than the height of the bearing retainer, and 2 cm larger or smaller than the thickness of the bearing retainer to ensure the smooth progress of the tensile test. Preferably, the height of the annular member is the same as the height of the bearing retainer.

[0051] In this embodiment, the baffle 5 is an annular member and will not affect the connection between the connecting member and the convex opening; the outer diameter of the baffle is greater than or equal to the outer diameter of one end of the bearing retainer in contact with it, and the inner diameter of the baffle 5 is less than or equal to the inner diameter of the non-convex portion of the annular member. Due to the provision of the annular convex portion, in order to avoid interference with the connecting member 2, arc grooves 5-1 are respectively provided on the inner side of the baffle 5 at the corresponding positions of the convex portion.

[0052] refer to Figure 2 and Figure 3 As shown, in this embodiment, the tooling is provided with two sections, namely the first tooling 1-4 and the second tooling 1-5. The first tooling 1-4 and the second tooling 1-5 are both hollowed out, and the first tooling is docked with the second tooling and connected by snap-fitting; the first tooling and the second tooling are both semicircular ring components.

[0053] The first tooling and the second tooling both include a tooling body, and the two tooling bodies can be assembled into an annular ring. The tooling bodies have the same structure and size. A hollow support plate 1-2 is provided in the middle position of the inner side wall of the two tooling bodies. The support plate 1-2 is provided along the radial direction of the first tooling. Along the axial direction of the annular part, the thickness of the support plate is less than the height of the annular part (which can be 1 / 12-1 / 8 of the height of the annular part), and the width of the support plate is less than the radius of the annular part at its position. The first support plate at the first tooling is provided with a protrusion or groove on the side facing the second tooling, and the second support plate at the second tooling is engaged and connected with the first support plate.

[0054] In some examples, the first support plate or the second support plate is a closed semi-annular member, the arc segment of the first support plate or the second support plate is fixedly connected to the inner wall of the corresponding tooling body, and the first support plate and the second support plate also include a straight plate segment 1-22 connected to the arc segment 1-21, and a protrusion or groove is set at the straight plate segment 1-22.

[0055] Specifically, a wire cutting process is used to cut the protrusions or grooves at the first support plate and the second support plate; in this embodiment, two protrusions 1-3 are set on the first support plate in the first tooling 1-4, and the distance between the two protrusions is greater than or equal to the radius of the annular part, and two grooves are set on the second support plate in the second tooling 1-5. In addition, blocks are set on both sides of the groove of the second support plate toward the direction of the first tooling, and grooves are set on both sides of the protrusion of the first support plate to engage with the blocks at the two ends of the groove. While ensuring the structural strength of the support plates of the first and second tooling, the length of the protrusion is ensured (which may be greater than the width of the straight plate section), and the guiding effect of the protrusion and the groove is further ensured. The protruding length of the protrusion is greater than the depth of the grooves on both sides of the groove, and the depth of the groove is 1 / 2-3 / 4 of the width of the straight plate section. The length direction of the protrusion is parallel to the plane where the two protrusions are located.

[0056] Among them, it is easy to understand that the width of the slot is smaller than the width of the protrusion, the length of the blocks 1-23 on both sides of the groove is smaller than the length of the protrusion 1-3, and the lengths of the blocks on both sides of the groove are the same or different, as long as they are compatible with the depth of the slots on both sides of the protrusion.

[0057] The inner side walls of the first tooling and the second tooling are both provided with a convex portion 1-1, which is located at the center of the inner side surface of the first tooling or the second tooling. The convex portion can be a cylindrical convex portion, which transitions with the arc of the inner side wall of the first tooling or the second tooling. The arc section of the support plate transitions along the convex portion. The length of the convex portion is the same as the thickness of the first tooling and the second tooling, and the plane where the central axes of the openings of the two convex portions are located passes through the central axis of the annular member.

[0058] In addition, the handle 3 is a U-shaped handle, the width of which is greater than the thickness of the bearing retainer. A tensile rod is provided at one end of the U-shaped handle, which is used to connect to an existing tensile testing device (such as a tensile testing machine), and an anti-slip groove 3-1 is provided on the side of the tensile rod.

[0059] It should be noted that the connecting part 2 is a pin, the length of the pin is greater than the length of the outer side of the U-shaped handle, and the pin passes through one side of the U-shaped handle, the convex opening, and the other side of the U-shaped handle in sequence. The pin serves to connect the handle and the annular part. The handle and the pin cooperate to achieve rapid replacement during the test, thereby improving efficiency.

[0060] The device provided in this embodiment utilizes multiple sections of tooling assembled into a ring-shaped component, facilitating manufacturing. Some or all of the tooling is hollowed out to reduce the mass of the ring and conserve resources. The tooling at both ends of the adjacent components engages, with the engagement acting as a guide to ensure uniform force on the device and the bearing retainer during the tensile test, thereby ensuring the accuracy of the breaking force test results. Specifically, two tooling sections are employed, with the first and second hollowed-out sections providing weight reduction. A 220mm diameter tooling weighs 17kg, but the lightweight design reduces its mass to 4.5kg, minimizing measurement errors caused by the tooling's weight. The handle remains unweighted to maximize the overall strength of the device.

[0061] Example 2

[0062] This embodiment provides a method for testing the breaking force of a bearing retainer, using the bearing retainer stretching device described in the first embodiment, and includes the following contents:

[0063] Place the first and second tooling pieces on the inner side of the bearing cage, and assemble the two pieces of tooling into a ring. The gap between the ring and the inner side of the bearing cage is 0.2-0.8mm.

[0064] The handle is placed on the bearing retainer, the handle corresponds to the position of the protrusion of the annular member, the connecting member passes through the handle and the opening of the protrusion, and the handle is connected to the tensile testing equipment;

[0065] Start the tensile testing equipment and apply a set tensile force to the handle. Pull the bearing cage outward through the handle and the ring. Gradually increase the tensile force and observe whether the bearing cage is broken.

[0066] After the set time, stop tensioning, disconnect the handle from the tensile testing equipment, remove the pin, remove the baffle, and remove the first tooling and the second tooling from the bearing retainer.

[0067] In this embodiment, the first fixture and the second fixture are snap-fitted together to ensure uniform force on the device during the tensile strength test. The clearance between them is between 0.1-0.4 mm, and the annular member fits closely with the inner surface of the bearing retainer, thereby ensuring the accuracy of the tensile strength test results of the bearing retainer, especially the tapered bearing retainer.

[0068] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A bearing retainer stretching device, characterized in that: It comprises a plurality of toolings, wherein two adjacent toolings in the plurality of toolings are connected by snapping and assembled into an annular member, the annular member can be placed inside the bearing retainer and fit the inner side surface of the bearing retainer, and the shape of the annular member is consistent with the shape of the bearing retainer; part or all of the toolings are hollowed out, a convex portion is provided on the side of the annular member away from the outer side surface thereof, an opening is provided at the convex portion, and the opening is provided along the axial direction of the annular member, a connecting member passes through a handle and the opening of the convex portion, and the handle can be connected to a tensile testing device; A baffle is provided at the end of the annular member to prevent the bearing retainer from falling off during the tensile test.

2. A bearing retainer stretching device according to claim 1, characterized in that: The baffle is fixedly connected to one end of the annular member by a fastener, and the fastener is detachably arranged relative to the baffle and the annular member; The mutual matching clearance between two adjacent tooling clamping connections is 0.1-0.4mm.

3. A bearing retainer stretching device according to claim 1, characterized in that: The annular member is a conical member, and the baffle is fixed to the end of the annular member with a smaller diameter; The thickness of the annular member matches the thickness of the bearing retainer, and the gap between the annular member and the inner side surface of the bearing retainer is 0.2-0.8 mm.

4. A bearing retainer stretching device according to claim 1, characterized in that: The baffle is a ring-shaped member; The outer diameter of the baffle is greater than or equal to the outer diameter of one end of the bearing retainer, and arc grooves are respectively arranged on the inner side surface of the baffle at positions corresponding to the convex parts.

5. A bearing retainer stretching device according to claim 1, characterized in that: The tooling is provided at two locations, namely a first tooling and a second tooling, and both the first tooling and the second tooling are hollowed out; The first tooling and the second tooling are both semicircular ring components.

6. A bearing retainer stretching device according to claim 5, characterized in that: The first tooling and the second tooling both include a tooling body, and the inner side walls of the tooling bodies are both provided with hollow support plates, the support plates are arranged along the radial direction of the first tooling or the second tooling, a first support plate at the first tooling is provided with a protrusion or a groove on the side facing the second tooling, and the second support plate at the second tooling is snap-connected with the first support plate.

7. A bearing retainer stretching device according to claim 6, characterized in that: The support plate is provided with blocks on both sides of the groove facing the other tooling, and the support plate is provided with card slots on both sides of the protrusion to respectively engage with the card blocks at two locations of the groove; The length of the protrusion is greater than that of the clamping block, and the length of the protrusion is greater than the width of the supporting plate where the protrusion is located.

8. A bearing retainer stretching device according to claim 5, characterized in that: The inner side walls of the first tooling and the second tooling are both provided with the convex parts, and the planes where the central axes of the openings of the two convex parts are located are arranged through the central axis of the annular member.

9. A bearing retainer stretching device according to claim 1, characterized in that: The handle is a U-shaped handle, the width of the U-shaped handle is greater than the thickness of the bearing retainer, a stretching rod is provided at one end of the U-shaped handle, and an anti-slip pattern is provided on the side of the stretching rod; The connecting piece is a pin, which passes through one side of the U-shaped handle, the convex opening, and the other side of the U-shaped handle in sequence.

10. A method for testing the tensile strength of a bearing retainer according to claim 4, characterized in that: A bearing retainer stretching device according to any one of claims 1 to 9, comprising the following contents: Place the tooling on the inner side of the bearing cage and assemble multiple sections of the tooling into a ring-shaped part; The handle is placed on the bearing retainer, the handle corresponds to the position of the protrusion of the annular member, the connecting member passes through the handle and the opening of the protrusion, and the handle is connected to the tensile testing equipment; The tensile test equipment is turned on to provide a set tensile force to the handle, and the bearing retainer is tensioned outward through the handle and the ring. The tensile force is gradually increased to observe whether the bearing retainer is broken.

Images