CN212059357U - Clamp suitable for self-lubricating oscillating bearing swing wear test under light-load working condition - Google Patents
Clamp suitable for self-lubricating oscillating bearing swing wear test under light-load working condition Download PDFInfo
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- CN212059357U CN212059357U CN202020766966.7U CN202020766966U CN212059357U CN 212059357 U CN212059357 U CN 212059357U CN 202020766966 U CN202020766966 U CN 202020766966U CN 212059357 U CN212059357 U CN 212059357U
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- 238000009434 installation Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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- 239000004519 grease Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The utility model relates to a self-lubricating joint bearing swing wear test anchor clamps suitable for under the light load operating mode. The clamp comprises a test bed, a joint bearing clamping part and a weight loading part; two parallel inverted T-shaped sliding grooves are formed in the upper portion of the experiment table; the joint bearing clamping part comprises a loading plate, a mandrel, a support, a joint bearing clamping plate, a servo rolling bearing and a top sleeve; the weight loading part comprises a weight seat, weights, a loading limiting plate and a supporting frame; the support and the support frame are fixed on the sliding groove and matched with other components to clamp and fix the joint bearing to be tested on the loading plate. The utility model discloses a design such as joint bearing splint, weight loading part can solve current some joint bearing anchor clamps to a great extent and skid and the unstable problem of loading between anchor clamps and the joint bearing that exist under the underload operating mode.
Description
Technical Field
The utility model relates to an experimental technical field specifically is an anchor clamps suitable for self-lubricating joint bearing swing wear test under the light load operating mode.
Background
The joint bearing is a spherical sliding bearing which is divided into a grease lubrication type and a self-lubrication type, and the overall structure of the joint bearing is composed of an outer spherical inner ring and an inner spherical outer ring. The self-lubricating joint bearing is a special joint bearing without replenishing lubricant, and a layer of solid lubricating material (MoS) is usually coated (plated) or bonded on the relative motion surface of the bearing2DLC, PTFE woven/composite, etc.) to reduce frictional resistance and extend bearing life. The high-temperature-resistant high-speed cable has the excellent characteristics of simple and compact structure, strong bearing and impact resistance, corrosion resistance, high temperature resistance, wear resistance, long service life, small pollution, low noise and the like, and is widely applied to the fields of aerospace, high-speed transportation, military equipment, water conservancy facilities, load-carrying machinery and the like. Particularly, along with the rapid development of aerospace industry in China in recent years, the utilization rate of the self-lubricating spherical plain bearing in the aerospace field is higher and higher. In the field of aerospace, self-lubricating spherical plain bearings are widely used in various spatial motion mechanisms, such as: locking mechanisms of solar wings, antennas and hatches, driving mechanisms of load platforms such as mechanical arms and landers, and the like. In the field of aviation, the self-lubricating joint bearing is an aircraft landing gear, a wing, a propeller and the likeThe transmission of key parts and the indispensable parts in the operation system. At the same time, however, the industries put higher and higher requirements on the service life, reliability, wear resistance and the like of the self-lubricating joint bearing in the using process.
At present, more and more scientific research units and colleges and universities at home and abroad start to build oscillating life testing machines for the joint bearings, and the service performance of various types of joint bearings is comprehensively investigated. However, when some light-load working condition simulation tests are performed, some testing machines have the phenomena of slipping of the outer ring and the clamp of the joint bearing, slipping of the inner ring and the mandrel of the joint bearing, left-right shaking of the clamp, unstable loading and the like, so that the testing machines have inaccurate measurement on the friction torque and the friction temperature of the joint bearing, and the judgment of related engineering personnel on the wear state of the bearing is seriously influenced.
For solving the above problem, the utility model designs an anchor clamps that self-lubricating joint bearing swing wear is experimental suitable for under the light load operating mode, can solve joint bearing and anchor clamps betterly and skid and the unstable phenomenon of loading.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a self-lubricating joint bearing swing wear test anchor clamps suitable for under the light load operating mode to the not enough of existence among the prior art. The clamp can solve the problems of slippage and unstable loading between the clamp and the joint bearing existing under the light-load working condition of some joint bearing clamps at present to a great extent through the design of a joint bearing clamping plate, a weight loading part and the like.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
a self-lubricating oscillating bearing swing abrasion test fixture suitable for a light-load working condition comprises a test bed, an oscillating bearing clamping part and a weight loading part;
the test bed is a cuboid, and two parallel inverted T-shaped sliding grooves are formed in the upper part of the test bed;
the joint bearing clamping part comprises a loading plate, a mandrel, a support, a joint bearing clamping plate, a servo rolling bearing and a top sleeve; the number of the support seats is 2, a through hole is formed in the center of each support seat, a rolling accompanying bearing is installed in each through hole, a top sleeve is installed in each rolling accompanying bearing, and bosses with threaded holes are arranged on two sides of the bottom of each support seat; the loading plate is a plate-shaped part, a square boss is arranged at the top of the loading plate, a counter bore is arranged above the boss, and a plate-shaped part below the boss is provided with a mounting through hole to be tested; the loading plate is positioned in the middle of the 2 sliding chutes and is vertical to and transverse to the direction of the sliding chutes; the outer ring of the joint bearing to be tested is as thick as the loading plate, and the outer diameter of the outer ring of the joint bearing to be tested is as same as the inner diameter of the mounting through hole to be tested of the loading plate; an annular joint bearing clamping plate is fixed on each of two sides of the installation through hole to be tested through bolts and clamps two sides of the outer ring of the joint bearing, and the center of the annular joint bearing clamping plate is the same as that of the installation through hole to be tested; the 2 supports are respectively positioned at two sides of the loading plate, and top sleeves arranged on the 2 supports are respectively and additionally arranged at two sides of the inner ring of the joint bearing to be tested; the bosses on the two sides of the support are respectively positioned on different sliding grooves and are fixed by bolts and nut blocks inside the sliding grooves; the mandrel penetrates through an inner ring of a joint bearing to be tested on the loading plate and top sleeves on supports on two sides; one end of the mandrel is connected with the driving device through a coupler, and a shaft head at the other end of the mandrel is provided with a gasket and a nut;
the weight loading part comprises a weight seat, weights, a loading limiting plate and a supporting frame; the supporting frame is of a columnar structure, one side of the bottom end of the supporting frame is provided with a boss with a threaded through hole, and the top end of the supporting frame is also provided with a threaded hole; the number of the supporting frames is four, and two supporting frames are in one group; the two support frames of each group are positioned on a sliding chute, are arranged in a back way, are respectively arranged at two sides of the joint bearing clamping part, and are fixed on the sliding chute through bolts on the boss and nut blocks inside the sliding chute; the number of the loading limiting plates is 2, two ends of each loading limiting plate are respectively fixed at the top end of each group of supporting frames through bolts, a square clamping groove is outwards arranged in the middle of each loading limiting plate, and the two loading limiting plates are additionally arranged at the front side and the rear side of the upper part of each loading plate; the weight seat is placed in a counter bore of a boss at the top end of the loading plate, and the weights are stacked on the weight seat;
the thickness of the inner ring of the joint bearing to be measured is larger than the sum of the thickness of the loading plate and the thickness of the joint bearing clamping plate which is 2 times of the thickness of the loading plate, and the difference value is 0.2-5 mm.
The inner diameter of the joint bearing clamping plate is smaller than the inner diameter of the mounting through hole to be measured by 0.2-6 mm.
The central lines of the installation through hole to be tested, the mandrel, the through hole of the support, the joint bearing clamping plate, the servo rolling bearing and the top sleeve on the loading plate are coaxial.
The utility model discloses a substantive characteristics do:
the utility model discloses a main innovation point is two. The first is joint bearing splint, can press from both sides tight joint bearing outer lane and load plate through the sheet metal structure who has designed into a round platform type, obviously improves the phenomenon of skidding. Secondly, weight loading part, the prerequisite that this anchor clamps used is under light load operating mode (300 ~ 1000N), so designed weight loading part, the structure is very simple, very convenient and anchor clamps main part cooperation installation, compares hydraulic loading (former testing machine loading mode) and traditional weight loading device simple more easy-to-use.
The utility model has the advantages that:
the swing abrasion test fixture for the self-lubricating joint bearing can provide a better solution for various problems of the traditional fixture under the light-load working condition, the joint bearing clamping plate can clamp the outer ring of the joint bearing and the loading plate, and the phenomenon that the outer ring of the joint bearing and the loading plate slip frequently in the test is prevented; the clamping nut and the washer on the mandrel provide axial force, so that the jacking sleeve can jack the inner ring of the joint bearing tightly, and the slipping phenomenon between the inner ring of the joint bearing and the mandrel is prevented.
The unstable phenomenon that hydraulic loading brought has greatly been improved to the weight loading part that this anchor clamps set up, and the weight loading has controlled the size of radial load more accurately, has guaranteed the loaded stability of experimental operating mode, and the phenomenon of rocking about the loading board under the light load operating mode has been solved simultaneously in the design of loading limiting plate, has further guaranteed the stability of experimentation.
The fixture for the swing wear test of the self-lubricating oscillating bearing under the light-load working condition well strengthens and perfects the defects of the traditional fixture under the light-load working condition, has two advantages of clamping the oscillating bearing and stably loading weights, and has high application value.
Drawings
The invention will be further explained with reference to the following figures and examples:
fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of the spherical plain bearing clamping portion taken parallel to the direction of the runner;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is an elevational, partial cross-sectional view of the load plate;
FIG. 5 is a schematic view of a joint bearing splint;
FIG. 6 is a left side view of the table;
FIG. 7 is a schematic view of a mechanism of a weight loading part;
FIG. 8 is a schematic view of a loading limiting plate;
in the figure, a weight seat 1, a weight 2, a loading plate 3, a loading limit plate 4, a mandrel 5, a support 6, a support frame 7, a test bed 8, a clamping nut 9, a bolt 10, a bolt 11, a gasket 12, a joint bearing 13 to be tested, a joint shaft clamping plate 14, a servo rolling bearing 15, a countersunk head bolt 16 and a top sleeve 17.
Detailed Description
As shown in figure 1, the fixture for the self-lubricating oscillating bearing swing wear test under the light-load working condition mainly comprises a test bed 8, an oscillating bearing clamping part and a weight loading part;
the test bed 8 is a cuboid, and two parallel and symmetrically distributed inverted T-shaped sliding chutes are arranged at the upper part of the test bed;
as shown in fig. 1 to 4, the joint bearing clamping portion includes a loading plate 3, a mandrel 5, a pedestal 6, a joint bearing chucking plate 14, a servo rolling bearing 15, and a top sleeve 17; the number of the supports 6 is 2, the supports are divided into a left support and a right support, the structures of the supports are the same, the supports are arranged in parallel, a through hole is formed in the middle of each support 6, and bosses with threaded holes are arranged on the left side, the right side and the outer side of the bottom of each support; the number of the rolling servo bearings 15 is 2, the rolling servo bearings are divided into a left rolling servo bearing and a right rolling servo bearing, and the rolling servo bearings are identical in structure; the two top sleeves 17 are divided into a left top sleeve and a right top sleeve and have the same structure; the left servo rolling bearing 15 is arranged in the left support 6, the left top sleeve 17 is arranged in the left servo rolling bearing 15, and the support 6, the rolling servo bearing 15 and the top sleeve 17 are in interference fit; similarly, the right servo rolling bearing 15 is arranged in the right support 6, and the right top sleeve 17 is arranged in the right servo rolling bearing 15. The bottom of the support 6 is connected with the test bed 8 through a bolt 10 and a nut block respectively and fixed on the sliding groove. The loading plate 3 is a plate-shaped part, a square boss is arranged at the top of the loading plate, a counter bore is arranged above the boss, a through hole and 4 threaded holes are arranged in the lower plate-shaped part, the through hole is horizontally coaxial with the through hole of the support 6, and every two threaded holes are spaced by 90 degrees; the loading plate 3 is positioned in the middle of the 2 sliding chutes and is vertical to and transverse to the direction of the sliding chutes; the joint bearing 13 to be tested is arranged in the through hole of the loading plate 3; the joint bearing clamping plate 14 is of an annular truncated cone structure (the vertical section of the truncated cone is trapezoidal), and the inner diameter of the annular truncated cone structure is 0.2-6 mm smaller than the diameter of the outer ring of the joint bearing to be tested, so that the outer ring of the joint bearing 14 to be tested is clamped (meanwhile, the contact between the inner edge of the joint bearing clamping plate 14 and the inner ring of the joint bearing to be tested is avoided); the surface is provided with 4 counter bores, and the positions of the counter bores correspond to the threaded holes of the loading plate 3; the two joint bearing clamping plates 14 are divided into a left joint bearing clamping plate and a right joint bearing clamping plate which have the same structure; the left joint bearing clamping plate 14 is fixed on the left side of the loading plate 3 through 4 countersunk head bolts 16, the right joint bearing clamping plate 14 is also fixed on the right side of the loading plate 3 through 4 countersunk head bolts 16, and an upper table surface (as the upper surface in fig. 5) of the joint bearing clamping plate 14 is attached to the surface of the loading plate 3; the left support 6 and the right support 6 are respectively clamped at two sides of the inner ring of the joint bearing 13 to be measured; the left support 6, the loading plate 3 and the right support 6 which are assembled sequentially penetrate through the mandrel 5, the left end face of the left ejector sleeve 17 is in contact with a shaft shoulder at the left end of the mandrel 5, the left ejector sleeve 17 and the right ejector sleeve 17 respectively push two sides of an inner ring of a joint bearing 14 to be tested, which is arranged in the loading plate 3, tightly, a clamping nut 9 and a gasket 12 are sequentially arranged on a right shaft head of the mandrel 5, the left shaft head of the mandrel 5 is connected with a driving device through a coupler and is a power end of a testing device, and connection of the left support 6, the loading plate 3 and the right support 6 is.
The thickness of the outer ring of the joint bearing to be tested is the same as that of the loading plate; the thickness of the inner ring of the joint bearing to be measured is larger than the sum of the thickness of the loading plate and the thickness of a joint bearing clamping plate which is 2 times of the thickness of the loading plate, and the difference value is 0.2-5 mm;
the left and right joint bearing clamping plates 14 tightly push the outer ring of the bearing 13 to be tested, so that the outer ring of the joint bearing 13 to be tested is prevented from slipping with the loading plate 3. The clamping nut 9 provides an axial force for tightly propping up the inner ring of the knuckle bearing 13 to be tested, so that the inner ring of the knuckle bearing 13 to be tested is prevented from slipping with the mandrel 5.
As shown in fig. 5, the joint bearing clamping plate 14 is preferably a circular ring thin plate structure, the thickness of which is smaller than the thickness difference of the inner ring and the outer ring of the joint bearing 13 to be measured on one side, the material of which is 45 steel, and the clamping plate has a certain rigidity, so that the outer ring of the joint bearing 13 to be measured and the loading plate 3 can be clamped to a large extent, and the outer ring of the joint bearing 13 to be measured and the loading plate 3 can be prevented from slipping.
The utility model discloses in, the size of joint bearing that awaits measuring needs and dabber, load plate and joint bearing splint match.
As shown in fig. 6, a nut block is placed in the inverted T-shaped groove, the nut block is a square block with a threaded hole, which is not shown in the figure, and the support frame 7 and the support 6 can be respectively and fixedly connected with the test bed 8 conveniently.
As shown in fig. 7 and 8, the weight loading part comprises a weight seat 1, a weight 2, a loading limiting plate 4 and a supporting frame 7; the supporting frames 7 are divided into two groups of left supporting frames and two groups of right supporting frames, the structures of the left supporting frames and the right supporting frames are the same, bosses with threaded through holes are arranged at the bottoms of the supporting frames 7 outwards, and threaded holes are formed in the positions, in contact with the loading limiting positions, of the upper ends of the supporting frames; the boss at the bottom of the supporting plate 7 is installed on the test bed 8 through a bolt 10 and a nut block, and the nut block is arranged in a T-shaped groove of the test bed 8. The loading limiting plates 4 are respectively provided with two rectangular plate-shaped parts, the structures of the two rectangular plate-shaped parts are all rectangular plate-shaped parts, a square clamping groove is formed in the middle of each loading limiting plate towards the direction of the loading plate, and U-shaped through holes are formed in the two ends of each loading limiting plate; the two loading limiting plates 4 are respectively installed at the upper ends of the left and right supporting frames 7 through bolts 11, the weight seat 1 is placed in a counter bore of a boss at the top end of the loading plate 3, and the weight 2 is stacked on the weight seat 1.
As shown in fig. 8, a U-shaped through hole is preferably formed at the connection between the loading limit plate 4 and the support frame 7, so that a certain fitting space can be provided for loading plates 7 with different sizes.
The test process comprises the following steps:
as shown in fig. 1, before the test, the left roller bearing 15 is installed in the left support 6, the left top sleeve 17 is installed in the left roller bearing 15, and similarly, the right roller bearing 15, the right top sleeve 17 and the right support 6 are installed in the same order; then, the knuckle bearing 13 to be tested is arranged in the loading plate 3, and the left knuckle bearing clamping plate 14 and the right knuckle bearing clamping plate 14 are fixedly arranged on the left side and the right side of the loading plate respectively by using the countersunk bolts 16; and finally, sequentially penetrating the assembled left support 6, the loading plate 3, the right support 6, the washer 12 and the clamping nut 9 through the mandrel from right to left. Tightening the clamping nut 9 to ensure that the inner ring of the joint bearing 13 to be tested and the mandrel 5 are in a locking state; screwing the bolts 10 to ensure the fixed connection between the support 6 and the support frame 7 and the test bed 8; the bolt 11 is screwed down to ensure that the loading limiting plate 4 locks the loading plate; the bottom end of a weight seat 1 is arranged in a counter bore at the top end of a loading plate, and a certain number of weights 2 are arranged on the weight seat 1 according to the setting of working condition parameters to replace light working condition loading. And starting a motor, driving the mandrel 5 to swing by the motor, correspondingly swinging the inner ring of the joint bearing 13 to be tested along with the mandrel 5, and forming relative sliding between the inner ring and the outer ring of the joint bearing 13 to be tested. The monitoring system of the testing machine can monitor the wear state of the joint bearing 13 in real time through the torque sensor and the temperature sensor.
The utility model is not the best known technology.
Claims (3)
1. A clamp suitable for a self-lubricating joint bearing swing wear test under a light-load working condition is characterized by comprising a test bed, a joint bearing clamping part and a weight loading part;
the test bed is a cuboid, and two parallel inverted T-shaped sliding grooves are formed in the upper part of the test bed;
the joint bearing clamping part comprises a loading plate, a mandrel, a support, a joint bearing clamping plate, a servo rolling bearing and a top sleeve; the number of the support seats is 2, a through hole is formed in the center of each support seat, a rolling accompanying bearing is installed in each through hole, a top sleeve is installed in each rolling accompanying bearing, and bosses with threaded holes are arranged on two sides of the bottom of each support seat; the loading plate is a plate-shaped part, a square boss is arranged at the top of the loading plate, a counter bore is arranged above the boss, and a plate-shaped part below the boss is provided with a mounting through hole to be tested; the loading plate is positioned in the middle of the 2 sliding chutes and is vertical to and transverse to the direction of the sliding chutes; the outer ring of the joint bearing to be tested is as thick as the loading plate, and the outer diameter of the outer ring of the joint bearing to be tested is as same as the inner diameter of the mounting through hole to be tested of the loading plate; an annular joint bearing clamping plate is fixed on each of two sides of the installation through hole to be tested through bolts and clamps two sides of the outer ring of the joint bearing, and the center of the annular joint bearing clamping plate is the same as that of the installation through hole to be tested; the 2 supports are respectively positioned at two sides of the loading plate, and top sleeves arranged on the 2 supports are respectively and additionally arranged at two sides of the inner ring of the joint bearing to be tested; the bosses on the two sides of the support are respectively positioned on different sliding grooves and are fixed by bolts and nut blocks inside the sliding grooves; the mandrel penetrates through an inner ring of a joint bearing to be tested on the loading plate and top sleeves on supports on two sides; one end of the mandrel is connected with the driving device through a coupler, and a shaft head at the other end of the mandrel is provided with a gasket and a nut;
the weight loading part comprises a weight seat, weights, a loading limiting plate and a supporting frame; the supporting frame is of a columnar structure, one side of the bottom end of the supporting frame is provided with a boss with a threaded through hole, and the top end of the supporting frame is also provided with a threaded hole; the number of the supporting frames is four, and two supporting frames are in one group; the two support frames of each group are positioned on a sliding chute, are arranged in a back way, are respectively arranged at two sides of the joint bearing clamping part, and are fixed on the sliding chute through bolts on the boss and nut blocks inside the sliding chute; the number of the loading limiting plates is 2, two ends of each loading limiting plate are respectively fixed at the top end of each group of supporting frames through bolts, a square clamping groove is outwards arranged in the middle of each loading limiting plate, and the two loading limiting plates are additionally arranged at the front side and the rear side of the upper part of each loading plate; the weight seat is placed in a counter bore of a boss at the top end of the loading plate, and the weights are stacked on the weight seat.
2. The fixture suitable for the swing wear test of the self-lubricating spherical plain bearing under the light-load working condition as claimed in claim 1, wherein the thickness of the inner ring of the spherical plain bearing to be tested is larger than the sum of the thickness of the loading plate and 2 times of the thickness of the joint bearing clamping plate, and the difference value is 0.2-5 mm.
3. The clamp suitable for the swing wear test of the self-lubricating spherical plain bearing under the light-load working condition as claimed in claim 1, wherein the inner diameter of the spherical plain bearing clamping plate is 0.2-6 mm smaller than the inner diameter of the installation through hole to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020766966.7U CN212059357U (en) | 2020-05-11 | 2020-05-11 | Clamp suitable for self-lubricating oscillating bearing swing wear test under light-load working condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020766966.7U CN212059357U (en) | 2020-05-11 | 2020-05-11 | Clamp suitable for self-lubricating oscillating bearing swing wear test under light-load working condition |
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| Publication Number | Publication Date |
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| CN212059357U true CN212059357U (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020766966.7U Expired - Fee Related CN212059357U (en) | 2020-05-11 | 2020-05-11 | Clamp suitable for self-lubricating oscillating bearing swing wear test under light-load working condition |
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| CN (1) | CN212059357U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112571220A (en) * | 2020-12-09 | 2021-03-30 | 中国航发哈尔滨轴承有限公司 | Tool for grinding annular belt of joint ball bearing and using method of tool |
| CN113503847A (en) * | 2021-06-20 | 2021-10-15 | 国营四达机械制造公司 | Bearing axial clearance measuring clamp |
| CN113551909A (en) * | 2021-07-28 | 2021-10-26 | 浙江中达精密部件股份有限公司 | Radial spherical plain bearing test bed |
-
2020
- 2020-05-11 CN CN202020766966.7U patent/CN212059357U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112571220A (en) * | 2020-12-09 | 2021-03-30 | 中国航发哈尔滨轴承有限公司 | Tool for grinding annular belt of joint ball bearing and using method of tool |
| CN113503847A (en) * | 2021-06-20 | 2021-10-15 | 国营四达机械制造公司 | Bearing axial clearance measuring clamp |
| CN113503847B (en) * | 2021-06-20 | 2023-02-28 | 国营四达机械制造公司 | Bearing axial clearance measuring clamp |
| CN113551909A (en) * | 2021-07-28 | 2021-10-26 | 浙江中达精密部件股份有限公司 | Radial spherical plain bearing test bed |
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Granted publication date: 20201201 |