Axial loading device for life test of angular contact ball bearing

Abstract

The utility model provides an angular contact ball bearing life test axial loading device, which comprises a core shaft, a locking screw arranged at one end of the core shaft and an axial loading block, a shaft end gland is clamped between the core shaft and the locking screw, one end of the shaft end gland is arranged corresponding to an inner ring of a test bearing, a loading ball is arranged on the locking screw in a pressing manner, and the axial loading block is arranged on the loading ball. The loading ball is clamped between the locking screw and the axial loading block, and the axial loading block carries out service life test axial loading on the inner ring of the test bearing through the loading ball and the shaft end gland under the axial load of the loading head of hydraulic loading or electric cylinder loading. The utility model provides a tool capable of directly carrying out axial loading on the service life test of the inner ring of the angular contact ball bearing, so as to meet the service life verification of the tested bearing under special working conditions, and has the characteristics of simple structure and convenience in operation.

Description

Technical Field

[0001] The utility model relates to an axial loading device for life test of an angular contact ball bearing. Background Art

[0002] Angular contact ball bearings can bear radial loads and axial loads at the same time and can work at higher speeds. The larger the contact angle, the higher the axial load capacity. Angular contact ball bearings have a simple structure and low manufacturing cost. They are suitable for mass production and are widely used in various mechanical equipment, such as machine tools, automobile steering systems, wind turbines, etc. Angular contact ball bearings can be divided into single-row angular contact ball bearings and double-row angular contact ball bearings. Single-row angular contact ball bearings can only bear axial loads in one direction, while double-row angular contact ball bearings can bear combined radial and axial loads dominated by larger radial loads.

[0003] The main purpose of endurance life test of angular contact ball bearings is to improve the design, materials and manufacturing process of bearing products. Under normal circumstances, when angular contact ball bearings need to be loaded with axial loads, the load is transferred to the outer ring end face of the angular contact ball bearings through test fixtures. However, there is currently no test fixture that can directly load the inner ring end face of the angular contact ball bearings, which cannot meet the life verification of the test bearings under some working conditions. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an axial loading device for an angular contact ball bearing life test.

[0005] To achieve the above-mentioned purpose, the utility model provides an axial loading device for an angular contact ball bearing life test, comprising a core shaft, a locking screw installed at one end of the core shaft, and an axial loading block, a shaft end pressure cover is sandwiched between the core shaft and the locking screw, one end of the shaft end pressure cover is arranged corresponding to the inner ring of the test bearing, a loading ball is tightly arranged on the locking screw, the loading ball is sandwiched between the locking screw and the axial loading block, and the axial loading block performs axial loading on the inner ring of the test bearing during a life test through the loading ball and the shaft end pressure cover under the axial load of the loading head of hydraulic loading or electric cylinder loading.

[0006] Furthermore, it also includes a left end cover and a right end cover installed at the two ends of the corresponding core shaft, the left end cover is provided with a center hole for the axial loading block to be installed and fixed, the axial loading block is provided with a groove for its installation corresponding to the loading ball, the left end cover is provided with a plurality of first oil filling holes for injecting oil toward the loading ball position, the axial loading block is provided with a second oil filling hole, one of the first oil filling holes is connected to the second oil filling hole, and the first oil filling hole and the second oil filling hole can inject oil and lubricate the two ends of the loading ball.

[0007] Furthermore, the axial loading block is provided with an oil storage hole facing axially outward at the bottom of the groove, and the groove is also provided with an oil drain hole, and the diameter of the oil drain hole is smaller than the diameter of the oil filling hole.

[0008] Furthermore, the axially inward end surface of the axial loading block is provided with a support block for facilitating the placement and installation of the loading ball, and the support block is located at the lower end of the loading ball.

[0009] Furthermore, a spacer is provided on the outer peripheral wall of the core shaft, and the core shaft locates the installation position of the bearing to be tested through the spacer. A heat dissipation bushing is provided between the left end cover and the right end cover. The heat dissipation bushing is arranged concentrically with the core shaft, and an outer ring spacer corresponding to the outer ring of the bearing to be tested is also provided between the heat dissipation bushing and the core shaft.

[0010] Furthermore, the outer peripheral wall of the outer ring spacer is sleeved with a middle bushing, the outer peripheral wall of the outer ring spacer is provided with a plurality of annular grooves, and the middle bushing is provided with through holes communicating with the annular grooves.

[0011] Furthermore, oil drain holes are provided on both sides of the heat dissipation bushing; and temperature measuring holes are provided on the middle bushing and the heat dissipation bushing.

[0012] The utility model structure applies axial load to the axial loading block through the loading head, transfers the load to the core shaft through the axial loading block and the loading ball, and finally acts on the test bearing through the core shaft, one end of the shaft end pressure cover sandwiched between the locking screw opened on the end face of the core shaft and the core shaft is aligned with the inner ring end face of the bearing to be tested, and the locking screw locks the shaft end pressure cover and the core shaft. By adopting the above technical scheme to simulate the working condition that the inner ring of the angular contact ball bearing receives the axial load, a tooling capable of directly performing axial loading on the inner ring of the angular contact ball bearing for life test is provided to meet the life verification of the test bearing under special working conditions, and has the characteristics of simple structure and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure in an embodiment of the utility model;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure in an embodiment of the utility model;

[0015] Figure 3 for Figure 2 A schematic diagram of the enlarged structure in FIG. DETAILED DESCRIPTION

[0016] The following is a further description of the embodiment of the utility model in conjunction with the accompanying drawings: As shown in the figure, the axial loading device for the life test of the angular contact ball bearing includes a core shaft 1, a locking screw 2 installed at one end of the core shaft 1, and an axial loading block 3. A shaft end pressure cap 4 is sandwiched between the core shaft 1 and the locking screw 2. One end of the shaft end pressure cap 4 is arranged corresponding to the inner ring of the test bearing. A loading ball 5 is tightly arranged on the locking screw 2. The loading ball 5 is sandwiched between the locking screw 2 and the axial loading block 3. The axial loading block 3 performs axial loading on the inner ring of the test bearing through the loading ball 5 and the shaft end pressure cap 4 under the axial load of the loading head of hydraulic loading or electric cylinder loading. A threaded hole is opened on the end face of the core shaft 1, and the locking screw 2 locks the shaft end pressure cap 4 and the core shaft 1 through the threaded hole. In order to reduce the contact area between the locking screw 2 and the loading ball 5 and reduce the heat generated by friction when the core shaft 1 rotates, a concave spherical surface is opened on the end face of the locking screw 2.

[0017] It also includes a left end cover 6 and a right end cover 7 installed at the two ends of the corresponding core shaft 1. The left end cover 6 is provided with a center hole for the axial loading block 3 to be installed and fixed. The axial loading block 3 is provided with a groove 8 for its installation corresponding to the loading ball 5. The left end cover 6 is provided with a plurality of first oil injection holes 9 for injecting oil toward the loading ball position. The axial loading block 3 is provided with a second oil injection hole 10, one of the first oil injection holes 9 is connected with the second oil injection hole 10, and the first oil injection hole 9 and the second oil injection hole 10 can inject oil and lubricate the two ends of the loading ball 5. The first oil injection hole 9 and the second oil injection hole 10 can prevent the loading ball 5 from being burned due to excessive temperature during the test by spraying lubricating oil on the surface of the loading ball 5. The left end cover 6 is provided with two oil injection holes for lubricating the contact surfaces at the two ends of the loading ball 5 respectively. The left end cover 6 is also provided with an oil drain hole to ensure that the lubricating oil can flow out smoothly.

[0018] The axial loading block 3 is provided with an axially outwardly facing oil storage hole 11 at the bottom of the groove 8, and the groove 8 is also provided with an oil drain hole 12, the diameter of which is smaller than the diameter of the oil filling hole.

[0019] The axially inward end surface of the axial loading block 3 is provided with a support block 13 for convenient placement and installation of the loading ball 5, and the support block 13 is located at the lower end of the loading ball 5. The support block 13 is fixed to the axial loading block 3 by threaded connection, and plays the role of supporting the loading ball 5 to prevent the loading ball 5 from falling when the tooling as a whole is not loaded.

[0020] The axial loading block 3 is provided with a second oil filling hole, an oil storage hole 11, and an oil drain hole 12. The groove 8 for installing the loading ball 5 is a conical surface. The lubricating oil enters from the oil filling hole and flows out through the oil drain hole 12. Since the diameter of the oil drain hole 12 is smaller than the diameter of the oil filling hole, the oil storage hole 11 will always have lubricating oil, ensuring that the contact surface between the loading ball 5 and the axial loading block 3 can be fully lubricated. In order to prevent the axial loading block 3 from rotating during the test operation, causing the lubricating oil hole position to shift, a set screw is connected to the axial loading block 3.

[0021] A spacer sleeve 14 is arranged on the outer peripheral wall of the core shaft 1, and the core shaft 1 locates the installation position of the bearing to be tested through the spacer sleeve 14. A heat dissipation bushing 15 is arranged between the left end cover 6 and the right end cover 7. The heat dissipation bushing 15 is arranged concentrically with the core shaft 1, and an outer ring spacer sleeve 16 corresponding to the outer ring of the bearing to be tested is also arranged between the heat dissipation bushing 15 and the core shaft 1.

[0022] The outer peripheral wall of the outer ring spacer 16 is sleeved with a middle bushing 17 . The outer peripheral wall of the outer ring spacer 16 is provided with a plurality of annular grooves 18 . The middle bushing 17 is provided with through holes communicating with the annular grooves 18 .

[0023] Oil drain holes are provided on both sides of the heat dissipation bushing; temperature measuring holes are provided on the middle bushing and the heat dissipation bushing.

[0024] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. An axial loading device for angular contact ball bearing life test, characterized in that: It includes a core shaft, a locking screw installed at one end of the core shaft, and an axial loading block. A shaft end cover is sandwiched between the core shaft and the locking screw. One end of the shaft end cover is arranged corresponding to the inner ring of the test bearing. A loading ball is tightly arranged on the locking screw. The loading ball is sandwiched between the locking screw and the axial loading block. The axial loading block performs axial loading on the inner ring of the test bearing through the loading ball and the shaft end cover under the axial load of the loading head of hydraulic loading or electric cylinder loading.

2. The axial loading device for angular contact ball bearing life test according to claim 1, characterized in that: It also includes a left end cover and a right end cover installed at the two ends of the corresponding core shaft, the left end cover is provided with a center hole for the axial loading block to be installed and fixed, the axial loading block is provided with a groove for its installation corresponding to the loading ball, the left end cover is provided with a plurality of first oil filling holes for injecting oil toward the loading ball position, the axial loading block is provided with a second oil filling hole, one of the first oil filling holes is connected to the second oil filling hole, and the first oil filling hole and the second oil filling hole can inject oil and lubricate the two ends of the loading ball.

3. The axial loading device for angular contact ball bearing life test according to claim 2, characterized in that: The axial loading block is provided with an oil storage hole facing outward axially at the bottom of the groove, and the groove is also provided with an oil drain hole, the diameter of which is smaller than the diameter of the oil filling hole.

4. The axial loading device for angular contact ball bearing life test according to claim 3 is characterized in that: The axially inward end surface of the axial loading block is provided with a support block for facilitating the placement and installation of the loading ball, and the support block is located at the lower end of the loading ball.

5. The axial loading device for angular contact ball bearing life test according to claim 2, characterized in that: A spacer is arranged on the outer peripheral wall of the core shaft, and the core shaft locates the installation position of the bearing to be tested through the spacer. A heat dissipation bushing is arranged between the left end cover and the right end cover, and the heat dissipation bushing is arranged concentrically with the core shaft. An outer ring spacer corresponding to the outer ring of the bearing to be tested is also arranged between the heat dissipation bushing and the core shaft.

6. The axial loading device for angular contact ball bearing life test according to claim 5, characterized in that: The outer peripheral wall of the outer ring spacer is sleeved with a middle bushing, the outer peripheral wall of the outer ring spacer is provided with a plurality of annular grooves, and the middle bushing is provided with through holes communicating with the annular grooves.

7. The axial loading device for angular contact ball bearing life test according to claim 6, characterized in that: Oil drain holes are provided on both sides of the heat dissipation bushing; temperature measuring holes are provided on the middle bushing and the heat dissipation bushing.

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