Rolling bearing test equipment

Abstract

The present application discloses a rolling bearing test device, and relates to the technical field of bearing test equipment. The rolling bearing test device of the present application comprises a support seat, a connecting shaft, a driving disc, a loading rope and a tension sensor, wherein the support seat has a mounting hole, a fixing seat is arranged in the mounting hole, and the fixing seat is provided with a fixing hole for fixing and connecting the outer ring of the rolling bearing to be tested; the connecting shaft is arranged in the fixing hole, and is used to fix and connect the inner ring of the rolling bearing to be tested; the driving disc is fixedly connected with the connecting shaft, and a first convex shaft and a second convex shaft are arranged on the driving disc; one end of the loading rope is fixedly connected with the first convex shaft, and the other end is freely suspended around the second convex shaft; the tension sensor is connected to one end of the loading rope freely suspended. Therefore, the present application does not need a motor, so that the rolling bearing can be tested at a lower cost, and the influence of the friction force and rotation speed of the motor shaft itself on the friction torque value of the rolling bearing is avoided, so that the measurement result is more accurate.

Description

Technical Field

[0001] The present application relates to the technical field of bearing testing equipment, and in particular to a rolling bearing testing device. Background Art

[0002] Rolling bearings are the main components of precision reducers for robot joints. The starting friction torque of rolling bearings is the key factor affecting the fatigue life of reducers.

[0003] In the prior art, the test device for testing the starting friction torque of rolling bearings generally uses a motor to test a single rolling bearing, which is costly. In addition, the friction and rotation speed of the motor shaft itself have a great influence on the friction torque value of the rolling bearing, making the measurement result inaccurate. Summary of the invention

[0004] The purpose of the present application is to provide a rolling bearing testing device, which can test the rolling bearing at a relatively low cost.

[0005] The embodiment of the present application is implemented as follows:

[0006] A rolling bearing testing device comprises a support seat, a connecting shaft, a driving disc, a loading rope and a tension sensor, wherein the support seat has a mounting hole, a fixing seat is arranged in the mounting hole, and the fixing seat is provided with a fixing hole for fixing the outer ring of the rolling bearing to be tested; the connecting shaft is passed through the fixing hole and is used for fixing the inner ring of the rolling bearing to be tested; the driving disc is fixedly connected to the connecting shaft, and a first cam and a second cam are arranged on the driving disc; one end of the loading rope is fixedly connected to the first cam, and the other end is freely suspended by passing around the second cam; the tension sensor is connected to one end of the freely suspended loading rope.

[0007] In one embodiment, the rolling bearing testing device includes a second loading bearing, the second loading bearing is disposed on the second convex shaft, and the loading rope is freely suspended around the second loading bearing.

[0008] In one embodiment, the rolling bearing testing device includes a first loading bearing, the first loading bearing is disposed on the first convex shaft, and the loading rope is fixedly connected to the first convex shaft by passing around the first loading bearing.

[0009] In one embodiment, the driving disk is a circular ring structure, and the first protruding shaft and the second protruding shaft are symmetrically arranged along the axis of the driving disk.

[0010] In one embodiment, the axis of the driving disk is coaxially arranged with the axis of the connecting shaft.

[0011] In one embodiment, the fixing hole comprises a first hole segment, a second hole segment and a third hole segment which are connected in sequence; wherein the first hole segment and the third hole segment are respectively used to install the two rolling bearings to be tested.

[0012] In one embodiment, the aperture of the first hole segment is equal to the aperture of the third hole segment, and the aperture of the first hole segment is smaller than the aperture of the second hole segment.

[0013] In one embodiment, a convex ring is provided on the inner wall of the first hole section, and the convex ring is used to abut against the outer ring of one of the rolling bearings to be tested.

[0014] In one embodiment, a groove is provided on the inner wall of the third hole section, a bearing retaining ring is provided in the groove, and the bearing retaining ring is used to abut against the inner ring of one of the rolling bearings to be tested.

[0015] In one embodiment, a shaft ring is provided on the connecting shaft, and two end surfaces of the shaft ring and the outer side wall of the connecting shaft respectively form two step surfaces, and the two step surfaces are used to abut against the inner rings of the two rolling bearings to be tested.

[0016] In one embodiment, the axial length of the collar is less than or equal to the axial length of the second hole segment.

[0017] In one embodiment, the fixing base and the supporting base are detachably connected.

[0018] In one embodiment, the fixing seat is fixedly connected to the supporting seat by bolts.

[0019] In one embodiment, the driving disk and the connecting shaft are connected by a key connection.

[0020] In one embodiment, the support seat includes a bottom plate and a vertical plate, the vertical plate is connected to the upper surface of the bottom plate, and the vertical plate and the bottom plate are arranged vertically. The mounting hole is arranged on the vertical plate. A reinforcing rib is arranged at the connection between the vertical plate and the bottom plate.

[0021] The beneficial effects of this application compared with the prior art are:

[0022] The present application does not require a motor, so that the rolling bearing can be tested at a relatively low cost, and the influence of the friction force and rotation speed of the motor shaft itself on the friction torque value of the rolling bearing is avoided, so that the measurement result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a rolling bearing testing device according to an embodiment of the present application;

[0025] Figure 2 A cross-sectional view of a rolling bearing testing device shown in one embodiment of the present application;

[0026] Figure 3 A cross-sectional view of a fixing seat and a connecting shaft shown in an embodiment of the present application;

[0027] Figure 4 For this application Figure 2 A magnified view of part A;

[0028] Figure 5 A partial exploded view of a rolling bearing testing device shown in an embodiment of the present application.

[0029] Icon: 100 - rolling bearing test device; 1 - support seat; 11 - mounting hole; 12 - bottom plate; 13 - vertical plate; 14 - reinforcing rib; 2 - fixed seat; 21 - fixing hole; 211 - first hole section; 2111 - convex ring; 212 - second hole section; 213 - third hole section; 2131 - groove; 2132 - bearing retaining ring; 22 - convex ring; 3 - connecting shaft; 31 - shaft ring; 311 - step surface; 4 - driving plate; 41 - first convex shaft; 42 - second convex shaft; 43 - center hole; 5 - loading rope; 6 - tension sensor; 71 - first loading bearing; 72 - second loading bearing; 8 - rolling bearing to be tested; 81 - first rolling bearing to be tested; 82 - second rolling bearing to be tested. DETAILED DESCRIPTION

[0030] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0033] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0034] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0035] Please refer to Figure 1 , which is a schematic diagram of the structure of a rolling bearing testing device 100 according to an embodiment of the present application. Figure 2 , which is a cross-sectional view of a rolling bearing testing device 100 shown in an embodiment of the present application.

[0036] The rolling bearing test device 100 includes a support seat 1, a connecting shaft 3, a driving disc 4, a loading rope 5 and a tension sensor 6. The support seat 1 has a mounting hole 11, a fixing seat 2 is arranged in the mounting hole 11, and the fixing seat 2 is provided with a fixing hole 21 for fixing and connecting the outer ring of the rolling bearing 8 to be tested; the connecting shaft 3 is passed through the fixing hole 21, and is used for fixing and connecting the inner ring of the rolling bearing 8 to be tested. The driving disc 4 is fixedly connected to the connecting shaft 3, and a first convex shaft 41 and a second convex shaft 42 are arranged on the driving disc 4; one end of the loading rope 5 is fixedly connected to the first convex shaft 41, and the other end is freely suspended around the second convex shaft 42; the tension sensor 6 is connected to one end of the loading rope 5 that is freely suspended.

[0037] During an operation, when the loading rope 5 is pulled around the freely suspended end of the second cam 42, the loading rope 5 slides over the second cam 42 and applies force to the first cam 41, so that the first cam 41 drives the driving disk 4 to rotate, and the driving disk 4 rotates to drive the connecting shaft 3 to rotate, and the connecting shaft 3 rotates to drive the inner ring of the rolling bearing 8 to be measured to rotate. At this time, the outer ring of the rolling bearing 8 to be measured is fixed to the support seat 1 through the fixing seat 2.

[0038] In a test process, the loading rope 5 is pulled around the freely suspended end of the second cam shaft 42 and loaded slowly and gradually. When the connecting shaft 3 rotates, the value displayed by the tension sensor 6 is recorded, and the starting friction torque value of the rolling bearing can be obtained from the value.

[0039] In a test process, since the first protruding shaft 41 and the second protruding shaft 42 are fixed and the load value applied by the loading rope 5 at a single time is small, the measurement accuracy can be improved by recording the load magnitude at the moment when the connecting shaft 3 rotates.

[0040] Since the starting friction torque value of the rolling bearing can reflect the manufacturing accuracy of the internal parts of the reducer and the assembly accuracy of the reducer, in order to verify and improve the assembly accuracy of the robot joint reducer, this embodiment can be applied to the design of the robot joint precision reducer. In this embodiment, the rolling bearing testing device 100 can be used to test one or more rolling bearings and the starting friction torque value of the rolling bearing.

[0041] This embodiment does not require a motor, so that the rolling bearing can be tested at a relatively low cost, and the influence of the friction force and rotation speed of the motor shaft itself on the friction torque value of the rolling bearing is avoided, so that the measurement result is more accurate.

[0042] This embodiment can also be used to test the friction torque value of other objects with one rotating shaft, or objects with two rotating shafts arranged opposite to each other. For example, the object to be tested can be mounted on the support seat 1, and the driving disk 4 and the rotating shaft can be fixedly connected by a key connection.

[0043] Please refer to Figure 2 The drive disk 4 is a circular ring structure, and the drive disk 4 has a central hole 43 (please refer to Figure 5 ), the connecting shaft 3 is inserted into the center hole 43 to be fixed. The axis of the driving disk 4 is coaxially arranged with the axis of the connecting shaft 3.

[0044] The first protruding shaft 41 and the second protruding shaft 42 are symmetrically arranged along the axis of the driving disk 4, and the first protruding shaft 41 and the second protruding shaft 42 are located on a circumference with the center of the driving disk 4 as the center. The symmetrical design of the first protruding shaft 41 and the second protruding shaft 42 ensures that the force applied by the loading rope 5 during the test is a torque around the center of the driving disk 4.

[0045] The fixed seat 2 is detachably fixed to the mounting hole 11 of the support seat 1 by means of bolt connection, pin connection, etc., and various types of rolling bearings can be measured by replacing the fixed seat 2 and the connecting shaft 3 of different sizes, such as the smaller rolling bearings in the robot joint reducer.

[0046] In this embodiment, the connection between the driving disk 4 and the connecting shaft 3 is a key connection. The outer ring of the rolling bearing 8 to be tested is pressed into the fixing hole 21 of the fixing seat 2 by means of interference fit or the like, and the connecting shaft 3 is pressed into the inner ring of the rolling bearing by means of interference fit or the like.

[0047] In the embodiment, the first convex shaft 41 and the second convex shaft 42 are integrally formed with the driving disk 4, or are fixed to the driving disk 4 by bolt connection, welding, etc. The fixing seat 2 and the supporting seat 1 are fixedly connected by welding, etc. or are integrally formed. The driving disk 4 can be a flange made of metal or other materials. The loading rope 5 can be a metal rope made of metal or other materials, and the end is fixedly connected to the first convex shaft 41 by screw connection, tightening, bonding, etc.

[0048] Please refer to Figure 2 The rolling bearing testing device 100 includes a second loading bearing 72 and a first loading bearing 71, and the second loading bearing 72 and the first loading bearing 71 can be rolling bearings. The second loading bearing 72 is sleeved on the second convex shaft 42, and the loading rope 5 is freely suspended by bypassing the second loading bearing 72. The first loading bearing 71 is sleeved on the first convex shaft 41, and the loading rope 5 is fixedly connected to the first convex shaft 41 by bypassing the first loading bearing 71. In the embodiment, the first convex shaft 41 and the second convex shaft 42 can be provided with end covers and protrusions for axial positioning of the first loading bearing 71 and the second loading bearing 72.

[0049] In this embodiment, the sliding friction between the loading rope 5 and the first convex shaft 41 and the second convex shaft 42 is changed to rolling friction by setting the first loading bearing 71 and the second loading bearing 72, thereby reducing the friction force, reducing the influence of the friction force on the friction torque value test of the rolling bearing, and improving the measurement accuracy.

[0050] Please refer to Figure 3 , which is a cross-sectional view of a fixing seat 2 and a connecting shaft 3 shown in an embodiment of the present application.

[0051] In this embodiment, the rolling bearing testing device 100 is used to test two pairs of rolling bearings. Figure 2 ) includes a first hole section 211, a second hole section 212 and a third hole section 213 connected in sequence from left to right; the aperture of the first hole section 211 is equal to the aperture of the third hole section 213, and the aperture of the first hole section 211 is smaller than the aperture of the second hole section 212. The first hole section 211 and the third hole section 213 are respectively used to install two rolling bearings 8 to be tested.

[0052] A convex ring 2111 is provided on the inner wall of the first hole section 211. A groove 2131 is provided on the inner wall of the third hole section 213.

[0053] The connecting shaft 3 is provided with a shaft collar 31 , and two end faces of the shaft collar 31 and the outer side wall of the connecting shaft 3 respectively form two step surfaces 311 . The axial length of the shaft collar 31 is less than or equal to the axial length of the second hole section 212 .

[0054] Please refer to Figure 4 , which is the present application Figure 2 Enlarged view of part A.

[0055] Two rolling bearings to be tested 8 (see Figure 2 ) from left to right are respectively the first rolling bearing 81 to be tested and the second rolling bearing 82 to be tested. The first hole section 211 is used to install the first rolling bearing 81 to be tested, and the third hole section 213 is used to install the second rolling bearing 82 to be tested. The drive plate 4 is arranged on the right side of the support seat 1, that is, relatively close to the third hole section 213 and relatively far away from the first hole section 211.

[0056] The convex ring 2111 abuts against the outer ring of the first rolling bearing 81 to be tested, and is used for axial positioning of the first rolling bearing 81 to be tested. Figure 3 ) is provided with a bearing retaining ring 2132, which abuts against the inner ring of the second measured rolling bearing 82 and is used for axial positioning of the second measured rolling bearing 82.

[0057] The collar 31 on the connecting shaft 3 is clamped between the first measured rolling bearing 81 and the second measured rolling bearing 82, and the two step surfaces 311 are against the inner rings of the first measured rolling bearing 81 and the second measured rolling bearing 82, which are used for axial positioning of the first measured rolling bearing 81 and the second measured rolling bearing 82.

[0058] Please refer to Figure 5 , which is a partial exploded view of a rolling bearing testing device 100 shown in an embodiment of the present application.

[0059] The fixing seat 2 is a circular ring structure, and the fixing hole 21 is a through hole that penetrates the fixing seat 2 along the axis direction of the fixing seat 2. A raised ring 22 is provided on the outer wall of the fixing seat 2, and the fixing seat 2 is fixedly connected to the support seat 1 through the raised ring 22.

[0060] The support base 1 includes a bottom plate 12 and a vertical plate 13. The vertical plate 13 is connected to the upper surface of the bottom plate 12, and the vertical plate 13 is vertically arranged with the bottom plate 12. The mounting hole 11 is arranged on the vertical plate 13. Two reinforcing ribs 14 are arranged at the connection between the vertical plate 13 and the bottom plate 12 to improve the strength.

[0061] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rolling bearing testing device, characterized in that: include: A support seat having a mounting hole, a fixing seat being arranged in the mounting hole, and a fixing hole for connecting the outer ring of the rolling bearing to be tested; A connecting shaft, which is inserted into the fixing hole and is used to connect the inner ring of the rolling bearing to be tested; A driving disk is fixedly connected to the connecting shaft, and a first convex shaft and a second convex shaft are provided on the driving disk; the driving disk is a circular ring structure, and the first convex shaft and the second convex shaft are symmetrically arranged along the axis of the driving disk; the axis of the driving disk is coaxially arranged with the axis of the connecting shaft; a loading rope, one end of which is connected to the first cam shaft and the other end of which is freely suspended by passing around the second cam shaft; and A tension sensor connected to one end of the loading rope that is freely suspended; A second loading bearing is provided on the second convex shaft, and the loading rope is freely suspended around the second loading bearing; The first loading bearing is arranged on the first convex shaft, and the loading rope is fixedly connected to the first convex shaft by passing around the first loading bearing.

2. The rolling bearing testing device according to claim 1, characterized in that: The fixing hole comprises a first hole segment, a second hole segment and a third hole segment connected in sequence; The aperture of the first hole segment is equal to the aperture of the third hole segment, and the aperture of the first hole segment is smaller than the aperture of the second hole segment; Wherein, the first hole section and the third hole section are respectively used to install the two rolling bearings to be tested.

3. The rolling bearing testing device according to claim 2, characterized in that: A convex ring is provided on the inner wall of the first hole section, and the convex ring is used to abut against the outer ring of one of the rolling bearings to be tested.

4. The rolling bearing testing device according to claim 2, characterized in that: A groove is provided on the inner wall of the third hole section, and a bearing retaining ring is provided in the groove. The bearing retaining ring is used to abut against the inner ring of the rolling bearing to be tested.

5. The rolling bearing testing device according to claim 2, characterized in that: The connecting shaft is provided with a shaft ring, and the two end surfaces of the shaft ring and the outer side wall of the connecting shaft respectively form two step surfaces, and the two step surfaces are used to abut against the inner rings of the two rolling bearings to be tested.

6. The rolling bearing testing device according to claim 1, characterized in that: The fixing seat and the supporting seat are detachably connected; the connection between the driving disk and the connecting shaft is a key connection.

7. The rolling bearing testing device according to claim 1, characterized in that: The support seat comprises a bottom plate and a vertical plate connected to each other, and the mounting hole is provided on the vertical plate. The vertical plate and the bottom plate are vertically arranged, and a reinforcing rib is arranged at the connection between the vertical plate and the bottom plate.

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