A test fixture for a needle roller bearing

Abstract

The present invention discloses a test tooling for a needle roller bearing, which comprises a support base, a bearing sleeve disposed within the support base, a test assembly disposed at the first axial end of the bearing sleeve, and a loading assembly disposed at the second axial end of the bearing sleeve; the test assembly includes a bearing fixing seat, a test main shaft fixed at an end of the bearing fixing seat away from the bearing sleeve, and a plurality of needle roller bearings mounted at an end of the bearing fixing seat close to the bearing sleeve, the test main shaft is in transmission connection with a driving component and rotates under the drive of the driving component, and the needle roller bearings are radially attached to the bearing sleeve. The test tooling for the needle roller bearing provided by the present invention can perform performance tests on a plurality of needle roller bearings under high-speed conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and particularly relates to a test fixture for a needle roller bearing. Background Art

[0002] The bolt shaft roller needle bearing is commonly used in low-speed and heavy-load working conditions. Therefore, the tests on this type of bearing simulate the low-speed conditions (hundreds of revolutions per minute) of the bearing. And due to the structure of the bolt shaft roller needle bearing, unlike the conventional needle roller bearing, under the constraints of the bearing housing and the mounting shaft, the performance of the bearing under different rotational speed conditions cannot be simulated by adjusting the rotational speed of the mounting shaft through a motor. Summary of the Invention

[0003] The object of the present invention is to provide a test fixture for a needle roller bearing, which can realize the performance of multiple needle roller bearings under different rotational speed conditions.

[0004] Based on the above problems, the technical solution provided by the present invention is as follows:

[0005] A test fixture for a needle roller bearing, comprising a support seat, a bearing sleeve disposed through the support seat, a test assembly disposed at the first axial end of the bearing sleeve, and a loading assembly disposed at the second axial end of the bearing sleeve for fitting the test assembly onto the bearing sleeve;

[0006] The test assembly includes a bearing fixing seat, a test main shaft fixed to an end of the bearing fixing seat away from the bearing sleeve, and a plurality of needle roller bearings mounted at an end of the bearing fixing seat close to the bearing sleeve. The test main shaft is in transmission connection with a driving component and rotates under the drive of the driving component. The needle roller bearings are radially fitted onto the bearing sleeve.

[0007] In some embodiments, the bearing sleeve includes a main body portion and a limiting portion extending radially outside the main body portion. A through groove for the bearing sleeve to extend into is provided on the support seat, and a shoulder matching the limiting portion is formed at one end of the through groove close to the loading assembly.

[0008] In some embodiments, a test groove for the needle roller bearing to extend into is provided on a side of the main body portion facing the test assembly.

[0009] In some embodiments, an oil passage is opened on a side of the main body portion close to the loading assembly, and the oil passage communicates with the test groove.

[0010] In some of these embodiments, the oil passage includes a plurality of first oil passages axially extending along the main body portion to the test groove, a second oil passage communicating with one of the first oil passages and radially extending along the main body portion, and a third oil passage connected to the second oil passage and axially extending along the main body portion to the center of the test groove.

[0011] In some of these embodiments, the bearing fixing seat includes a rotating shaft fixing portion and a bearing mounting portion. The rotating shaft fixing portion is fixedly connected to the test main shaft, and a plurality of support shafts are circumferentially and fixedly spaced on the bearing mounting portion. The needle roller bearing is rotatably supported on the support shafts and is located inside the bearing mounting portion.

[0012] In some of these embodiments, the loading assembly includes a loading shaft and a loading member connecting the loading bearing.

[0013] In some of these embodiments, the loading member is a cylinder or an oil cylinder.

[0014] In some of these embodiments, the test assembly further includes a first rotating seat and a second rotating seat. The middle part of the test main shaft is rotatably supported on the first rotating seat via a companion bearing, and one end of the test main shaft away from the bearing fixing seat is inserted through the second rotating seat.

[0015] In some of these embodiments, the driving member is a motor.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. This test tooling can test the performance of multiple needle roller bearings under different speed regulations, improving the test efficiency;

[0018] 2. This test tooling can convert the angular velocity of the test main shaft into the linear velocity of the bearing, which can increase the test speed of the bearing to test the performance of the bearing under high-speed conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. The following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a test tooling for a needle roller bearing of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the bearing fixing seat in the embodiment of the present invention;

[0022] Figure 3 Schematic cross-sectional view of the bearing fixing seat in the embodiment of the present invention;

[0023] Wherein:

[0024] 1. Support seat; 1-1. Through groove; 1-2. Axle shoulder;

[0025] 2. Load-bearing bushing; 2-1. Main body part; 2-2. Limiting part; 2-3. Test groove; 2-4. Oil passage; 2-4a. First oil passage; 2-4b. Second oil passage; 2-4c. Third oil passage;

[0026] 3. Loading shaft;

[0027] 4. Bearing fixing seat; 4-1. Rotating shaft fixing part; 4-2. Bearing mounting part;

[0028] 5. Needle roller bearing;

[0029] 6. Test main shaft;

[0030] 7. First rotating seat;

[0031] 8. Accompanying test bearing;

[0032] 9. Second rotating seat;

[0033] 10. Positioning pin;

[0034] 11. Support shaft. Specific implementation mode

[0035] The above solution will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are for illustrating the present invention and not for limiting the scope of the present invention. The implementation conditions adopted in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0036] Refer to Figure 1 , which is an embodiment of the present invention, providing a test tooling for a needle roller bearing, including a support seat 1, a load-bearing bushing 2 inserted in the support seat 1, a test assembly arranged at the first axial end of the load-bearing bushing 2, and a loading assembly arranged at the second axial end of the load-bearing bushing 2 for attaching the test assembly to the load-bearing bearing sleeve 2.

[0037] The test assembly includes a bearing fixing seat 4, a test main shaft 6 fixed at one end of the bearing fixing seat 4 away from the load-bearing bushing 2, and a plurality of needle roller bearings 5 installed at one end of the bearing fixing seat 4 close to the load-bearing bushing 2. The test main shaft 6 is in transmission connection with a driving component and rotates under the driving component. The needle roller bearings 5 are radially attached to the load-bearing bushing 2.

[0038] Among them, the bearing bushing 2 includes a main body portion 2-1 and a limiting portion 2-2 extending radially outward of the main body portion 2-1. A through groove 1-1 for the bearing bushing 2 to extend into is provided on the support base 1. An axial shoulder 1-2 matching the limiting portion 2-2 is formed at one end of the through groove 1-1 close to the loading assembly. Thus, by loading a load at one end of the main body portion 2-1 away from the test assembly through the loading assembly, the bearing bushing 2 can be fixed within the support base 1.

[0039] To facilitate the high-speed testing of the needle roller bearing 5, a test groove 2-3 for the needle roller bearing 5 to extend into is provided on one side of the main body portion 2-1 facing the test assembly. During the test, the bearing fixing seat 4 component can be extended into the test groove 2-3 so that the needle roller bearing 5 is radially fitted within the test groove 2-3, thereby facilitating the application of a radial load to the needle roller bearing 5.

[0040] To facilitate the lubrication of the needle roller bearing 5 during the test, an oil passage 2-4 is opened on one side of the main body portion 2-1 close to the loading assembly, and the oil passage 2-4 communicates with the test groove 2-3. Specifically, the oil passage 2-4 includes a plurality of first oil passages 2-4a extending axially along the main body portion 2-1 to the test groove 2-3, a second oil passage 2-4b communicating with one of the first oil passages 2-4a and extending radially along the main body portion 2-1, and a third oil passage 2-4c connected to the second oil passage 2-4b and extending axially along the main body portion 2-1 to the center of the test groove 2-3. Thus, the lubricating oil can flow into the test groove 2-3 through the oil passage 2-4 to facilitate the lubrication of the needle roller bearing 5.

[0041] Combined Figure 2 、 Figure 3 , the bearing fixing seat 4 includes a rotating shaft fixing portion 4-1 and a bearing mounting portion 4-2. The rotating shaft fixing portion 4-1 is fixedly connected to the test main shaft 6 through a positioning pin 10 to complete the transmission of torque. Three support shafts 11 are fixedly arranged at intervals along the circumferential direction of the bearing mounting portion 4-2. The support shafts 11 extend radially along the bearing mounting portion 4-2. The needle roller bearing 5 is rotatably supported on the support shafts 11 and is located inside the bearing mounting portion 4-2. It should be understood that more support shafts 11 can be provided according to needs to test a large number of needle roller bearings 5.

[0042] The loading assembly includes a loading shaft 3 and a loading component connected to the loading shaft 3. Preferably, the loading component is a cylinder or an oil cylinder. The loading component drives the loading shaft 3 to abut against the bearing bushing 2, fixes the bearing bushing 2, and applies a load axially along the bearing bushing 2. The loading magnitude can be adjusted according to the loading component.

[0043] To facilitate the support of the test spindle 6, the test assembly further includes a first rotating seat 7 and a second rotating seat 9. The middle part of the test spindle 6 is rotationally supported on the first rotating seat 7 via a companion bearing 8, and one end of the test spindle 6 away from the bearing fixing seat 4 is inserted through the second rotating seat 9. The driving component is a motor, and the rotation speed of the test spindle 6 is adjusted by adjusting the rotation speed of the motor, thereby adjusting the rotation speed of the needle roller bearing 5.

[0044] The needle roller bearing 5 is installed on the bearing fixing seat 4, and a radial load is applied to the needle roller bearing 5 through the loading component driving the loading shaft 3 via the bearing sleeve 2. The magnitude of the radial load can be adjusted by the loading component, and the rotation speed of the needle roller bearing 5 is adjusted by driving the test spindle 6 through the driving component.

[0045] During the test, the three needle roller bearings 5 installed on the bearing fixing seat 4 are in frictional contact with the raceway surface of the bearing under the drive of the bearing fixing seat 4 to achieve continuous rotation. In this test state, the needle roller bearing 5 operates in a mode where the inner ring is fixed and the outer ring rotates.

[0046] Judgment of the test results:

[0047] If a failure occurs during the operation of the bearing, it cannot operate normally, or the bearing sample parts are scattered, broken, or jammed, it should be judged as a failure.

[0048] If the bearing completes the specified test time, it is necessary to observe the outer ring appearance of the needle roller bearing 5. If obvious wear appears, the bearing is judged to be a failure. If there is no obvious wear phenomenon, it is necessary to continue to disassemble and analyze the bearing to check whether there is obvious spalling on the surface of the needle rollers, inner ring, and outer ring raceway inside the bearing. When the spalling depth is greater than or equal to 0.02 mm and the spalling area is greater than or equal to 1 square millimeter, the bearing can be judged as a failure.

[0049] The above examples are only to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A test tooling for a needle roller bearing, characterized in that: It includes a support base, a bearing sleeve disposed within the support base, a test assembly provided at the first axial end of the bearing sleeve, and a loading assembly provided at the second axial end of the bearing sleeve; The test assembly includes a bearing fixing base, a test main shaft fixed to the end of the bearing fixing base away from the bearing sleeve, and a plurality of needle roller bearings mounted at the end of the bearing fixing base close to the bearing sleeve. The test main shaft is in transmission connection with a driving component and rotates driven by the driving component. The needle roller bearings are radially attached to the bearing sleeve; The bearing sleeve includes a main body portion and a limiting portion extending radially outside the main body portion. A through groove for the bearing sleeve to extend into is provided on the support base, and a shoulder matching the limiting portion is formed at one end of the through groove close to the loading assembly; A test groove for the needle roller bearings to extend into is provided on one side of the main body portion facing the test assembly; An oil passage is formed on one side of the main body portion close to the loading assembly, and the oil passage communicates with the test groove.

2. The test tooling for the needle roller bearing according to claim 1, characterized in that: The oil passage includes a plurality of first oil passages extending axially along the main body portion to the test groove, a second oil passage communicating with one of the first oil passages and extending radially along the main body portion, and a third oil passage connected to the second oil passage and extending axially along the main body portion to the center of the test groove.

3. The test tooling for the needle roller bearing according to claim 2, wherein: The bearing fixing base includes a rotating shaft fixing portion and a bearing mounting portion. The rotating shaft fixing portion is fixedly connected to the test main shaft. A plurality of support shafts are circumferentially and fixedly arranged on the bearing mounting portion. The needle roller bearings are rotatably supported on the support shafts and are located inside the bearing mounting portion.

4. The test tooling for the needle roller bearing according to claim 1, characterized in that: The loading assembly includes a loading shaft and a loading component connecting the loading bearing.

5. The test tooling for the needle roller bearing according to claim 4, characterized in that: The loading component is a cylinder or an oil cylinder.

6. The test tooling for the needle roller bearing according to claim 1, characterized in that: The test assembly further includes a first rotating seat and a second rotating seat. The middle part of the test main shaft is rotatably supported on the first rotating seat via a companion bearing, and one end of the test main shaft away from the bearing fixing base is passed through the second rotating seat.

7. The test tooling for the needle roller bearing according to claim 1, characterized in that: The driving component is a motor.

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