阅读说明：本技术 一种轴承径向试验机构 (Radial test mechanism of bearing ) 是由 张斌 蒋智杰 李小明 马金坚 连芸英 蒋恒 马国峰 郭鹏宇 于 2019-11-13 设计创作，主要内容包括：本发明涉及轴承试验技术领域,具体公开了一种轴承径向试验机构,至少包括工作台、试验单元、径向加载组件以及摆动组件,其中试验单元至少包括试验轴组件、外圈固定件、外圈承载组件以及径向加载座,所述径向加载座包括径向加载上座和径向加载下座,所述径向加载上座与外圈承载组件之间设置有一对背对背安装的圆锥滚子轴承。上述结构中,一对背对背安装的圆锥滚子轴承,实现了径向推拉载荷与往复摆动的运动分离以及径向推拉载荷的传递,具有结构简单、构思巧妙的技术优势,颠覆了传统的轴承试验机构的结构形式。同时,其模拟的轴承测试工况与实际工况更加接近,测试结果也更加可靠。(The invention relates to the technical field of bearing tests, and particularly discloses a bearing radial test mechanism which at least comprises a workbench, a test unit, a radial loading assembly and a swinging assembly, wherein the test unit at least comprises a test shaft assembly, an outer ring fixing piece, an outer ring bearing assembly and a radial loading seat, the radial loading seat comprises a radial loading upper seat and a radial loading lower seat, and a pair of tapered roller bearings which are arranged back to back are arranged between the radial loading upper seat and the outer ring bearing assembly. In the structure, the pair of tapered roller bearings arranged back to back realize the motion separation of radial push-pull load and reciprocating swing and the transmission of the radial push-pull load, has the technical advantages of simple structure and ingenious conception, and overturns the structural form of the traditional bearing test mechanism. Meanwhile, the simulated bearing test working condition is closer to the actual working condition, and the test result is more reliable.)

1. A bearing radial test mechanism comprising at least:

a table (400) fixedly arranged;

a test unit (100) located above the table;

a radial loading assembly (300) acting on one side of the test unit close to the workbench;

the swing assembly (200) acts on one side, far away from the workbench, of the test unit;

characterized in that said test unit (100) comprises at least:

the test shaft assembly (110) is used for limiting an inner ring of a bearing to be tested;

the bearing outer ring fixing piece comprises an outer ring fixing piece (120) and a fixing rod (122), wherein the outer ring fixing piece comprises a fixing ring (121) which is sleeved on the outer ring of the bearing to be detected and the fixing rod (122) which extends along the radial direction of the fixing ring;

the fixed rod is fixedly connected with the outer ring bearing assembly, and one end of the outer ring bearing assembly, which is far away from the fixed ring, is connected with the swinging assembly;

the radial loading seat comprises a radial loading upper seat (140) and a radial loading lower seat (130) which are fixedly connected with each other, one side, far away from the radial loading upper seat, of the radial loading lower seat is fixedly connected with a radial loading assembly, a pair of tapered roller bearings (170) are arranged between the radial loading upper seat and an outer ring bearing assembly, and the tapered roller bearings are installed back to back.

2. The bearing radial test mechanism of claim 1, wherein said outer race carrier assembly comprises at least:

the inner fixing sleeve (150) is sleeved with an internal thread hole (151) with one open end, the fixing rod is provided with an external thread matched with the internal thread hole, and the fixing rod is in threaded connection with the inner fixing sleeve; an external cone part (152) is arranged at one side of the opening of the internal thread hole, and a plurality of through grooves (153) which extend along the axial direction and penetrate through the hole wall of the internal thread hole are arranged in the circumferential direction of the external cone part;

the outer fixed cover (180), the outer fixed cover with interior fixed cover fixed connection, the outer fixed cover is equipped with axial through-going be used for holding interior fixed cover's perforating hole (181), the one end of perforating hole be equipped with interior pyramis (182) of outer pyramis adaptation, the one end that interior pyramis was kept away from to the outer fixed cover is connected with the swing subassembly.

3. The bearing radial test mechanism according to claim 2, characterized in that the end of the inner fixing sleeve away from the external cone portion is provided with a threaded connection end (154), the end of the through hole away from the internal cone portion is provided with a counter bore (183), and the inner fixing sleeve are fixedly connected through a washer (191) matched with the counter bore and a nut (192) matched with the threaded connection end.

4. The bearing radial test mechanism of claim 2, wherein said radial loading upper seat is provided with a through hole (143) for receiving the outer fixing sleeve therethrough, and both ends of said through hole are respectively provided with a first bearing mounting hole (141) and a second bearing mounting hole (142) for receiving the tapered roller bearing.

5. The bearing radial test mechanism of claim 4, characterized in that an end of the outer fixed sleeve at the counter bore is provided with an end cover (184), a free end of the end cover is connected with the swing assembly, the other end of the end cover forms a limit end surface (185) for abutting contact with an inner ring of the tapered roller bearing, and an end of the outer fixed sleeve away from the end cover is provided with a connecting external thread (186).

6. The bearing radial test mechanism of claim 5, characterized in that a pair of said tapered roller bearings are sleeved on the outer fixed sleeve, wherein the inner ring of one of the tapered roller bearings is in contact with the limit end face, a spacing ring (190) is arranged between the inner rings of the pair of said tapered roller bearings, a sealing ring (193) is arranged on the side of the inner ring of the tapered roller bearing far from the limit end face, and a locking nut (194) matched with the connecting external thread is arranged on the side of the sealing ring far from the tapered roller bearing.

7. The radial bearing test mechanism of claim 6, wherein a seal is provided between each end of said radial loading upper seat and said outer retainer.

8. The bearing radial test mechanism of claim 1, wherein a carrier (133) is disposed between the radially loaded upper and lower seats, the carrier having a carrier aperture (134) therethrough for receiving the outer race retainer.

9. A bearing radial test mechanism according to any of claims 1 to 8, wherein said wobble assembly comprises at least:

the swing supporting seat (210) is fixedly arranged;

a swing flange (222) used for being connected with the outer ring bearing assembly is arranged at one end of the swing shaft (220), and a spline shaft (221) is arranged at the other end of the swing shaft;

the spline sleeve (223) is axially and movably connected with the spline shaft;

the spline sleeve is fixedly connected with the spline connecting shaft, and the spline connecting shaft is rotatably and movably connected with the swing supporting seat;

the swing cylinder (240) is fixedly connected to one side, far away from the swing shaft, of the swing support seat, and a torque sensor (230) is arranged between an output shaft of the swing cylinder and the spline connecting shaft;

and the encoder assembly (250) is arranged at one end, far away from the swing supporting seat, of the swing cylinder.

10. A bearing radial test mechanism according to any of claims 1 to 8, wherein said radial loading assembly comprises at least:

a load support (310) fixedly disposed;

the linear loading cylinder (320) is fixedly connected with the loading supporting seat;

the piston rod (330) is axially and movably connected with the linear loading cylinder body;

the piston rod of the radial loading device comprises a linear loading rod (350), one end of the linear loading rod is connected with the piston rod through a pulling pressure sensor (340), and the other end of the linear loading rod is fixedly connected with the radial loading lower seat.

Technical Field

The invention relates to the technical field of bearing tests, in particular to a radial test mechanism for a bearing.

Background

The joint bearing is a mechanical universal part and has the characteristics of small volume and high bearing capacity. In actual operation, the bearing not only has the function of swinging or rotating the inner ring around the axis, but also has the function of aligning the outer ring by reciprocating and deflecting around the radial direction, so that the bearing is widely applied to the fields of aviation, aerospace, trains, automobiles, mining machinery, machine tools, engineering machinery and the like.

The dynamic service life of the joint bearing is generally evaluated by a simulation testing machine, and the simulation of radial bidirectional push-pull load application during the self-aligning motion of the outer ring of the bearing around the radial deflection cannot be realized in the conventional bearing testing equipment. In order to simulate the working condition of the joint bearing more accurately and ensure that the application of the radial push-pull load and the application of the eccentric motion of the outer ring relative to the inner ring do not interfere with the axial push-pull load of the bearing and the reciprocating swing rotating around the axis, the applicant designs an independent bearing radial testing mechanism.

Disclosure of Invention

The invention aims to solve the technical problem that an independent bearing test mechanism which can apply radial push-pull load to a bearing and can apply deflection motion of a bearing outer ring relative to an inner ring is lacked in the prior art.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a bearing radial test mechanism comprising at least:

the workbench is fixedly arranged;

the test unit is positioned above the workbench;

the radial loading assembly acts on one side, close to the workbench, of the test unit;

the swinging assembly acts on one side of the test unit, which is far away from the workbench;

the test unit at least comprises:

the test shaft assembly is used for limiting an inner ring of the bearing to be tested;

the outer ring fixing piece comprises a fixing ring and a fixing rod, wherein the fixing ring is sleeved on the outer ring of the bearing to be detected, and the fixing rod extends along the radial direction of the fixing ring;

the fixed rod is fixedly connected with the outer ring bearing assembly, and one end of the outer ring bearing assembly, which is far away from the fixed ring, is connected with the swinging assembly;

the radial loading seat comprises a radial loading upper seat and a radial loading lower seat which are fixedly connected with each other, one side, far away from the radial loading upper seat, of the radial loading lower seat is fixedly connected with the radial loading assembly, a pair of tapered roller bearings are arranged between the radial loading upper seat and the outer ring bearing assembly, and the tapered roller bearings are installed back to back.

In a preferred embodiment, the outer ring carrier assembly comprises at least:

the inner fixing sleeve is provided with an internal thread hole with an opening at one end, the fixing rod is provided with an external thread matched with the internal thread hole, and the fixing rod is in threaded connection with the inner fixing sleeve; the inner fixing sleeve is provided with an outer cone part at one side of an opening of the inner threaded hole, and the circumferential direction of the outer cone part is provided with a plurality of through grooves which extend along the axial direction and penetrate through the hole wall of the inner threaded hole;

the outer fixed cover, outer fixed cover with interior fixed cover fixed connection, the outer fixed cover is equipped with the axial through-going be used for holding the perforating hole of interior fixed cover, the one end of perforating hole be equipped with the interior pyramis of outer pyramis adaptation, the one end that interior pyramis was kept away from to outer fixed cover is connected with the swing subassembly.

According to the preferred embodiment, one end, away from the outer cone portion, of the inner fixing sleeve is provided with the threaded connecting end, one end, away from the inner cone portion, of the through hole is provided with the counter bore, and the inner fixing sleeve are fixedly connected through the washer matched with the counter bore and the nut matched with the threaded connecting end.

According to the preferred embodiment, a through hole for accommodating the outer fixing sleeve to pass through is formed in the radial loading upper seat, and a first bearing mounting hole and a second bearing mounting hole for accommodating the tapered roller bearing are respectively formed in two ends of the through hole.

According to the preferred embodiment, an end cover is arranged at one end, where the counter bore is located, of the outer fixing sleeve, the free end of the end cover is connected with the swinging assembly, the other end of the end cover forms a limiting end face which is used for abutting against and contacting with an inner ring of the tapered roller bearing, and a connecting external thread is arranged at one end, away from the end cover, of the outer fixing sleeve.

According to a preferred embodiment, the pair of tapered roller bearings are sleeved on the outer fixed sleeve, the inner ring of one tapered roller bearing is in contact with the limiting end face, a spacing ferrule is arranged between the inner rings of the pair of tapered roller bearings, a sealing ring is arranged on one side, away from the spacing ferrule, of the inner ring of the tapered roller bearing on one side of the limiting end face, and a locking nut matched with the connecting external thread is installed on one side, away from the tapered roller bearing, of the sealing ring.

In a preferred embodiment, a sealing structure is arranged between each of the two ends of the radial loading upper seat and the outer fixing sleeve.

In a preferred embodiment, a supporting plate is arranged between the radial loading upper seat and the radial loading lower seat, and a supporting plate hole for accommodating the outer ring fixing piece to pass through is formed in the supporting plate.

In a preferred embodiment, the oscillating assembly comprises at least:

the swing supporting seat is fixedly arranged;

one end of the swinging shaft is provided with a swinging flange used for being connected with the outer ring bearing assembly, and the other end of the swinging shaft is provided with a spline shaft;

the spline sleeve is axially and movably connected with the spline shaft;

the spline sleeve is fixedly connected with the spline connecting shaft, and the spline connecting shaft is rotatably and movably connected with the swing supporting seat;

the swing cylinder is fixedly connected to one side, far away from the swing shaft, of the swing support seat, and a torque sensor is arranged between an output shaft of the swing cylinder and the spline connecting shaft;

the encoder assembly is arranged at one end, far away from the swing supporting seat, of the swing cylinder.

In a preferred embodiment, the radial loading assembly comprises at least:

the loading supporting seat is fixedly arranged;

the linear loading cylinder body is fixedly connected with the loading support seat;

the piston rod is axially and movably connected with the linear loading cylinder body;

and one end of the linear loading rod is connected with the piston rod through a pull pressure sensor, and the other end of the linear loading rod is fixedly connected with the radial loading lower seat.

The bearing radial test mechanism of this embodiment, wherein the bearing that awaits measuring is located the test unit, the inner circle of the bearing that awaits measuring in order to be used for supporting and restricting the inner circle of the bearing that awaits measuring is measured to the experimental axle subassembly restriction, outer lane mounting then the cover is located on the outer lane of the bearing that awaits measuring, outer lane bearing assembly then with outer lane mounting fixed connection, it is when bearing the radial push-and-pull load and the reciprocal swing of radial loading subassembly, with radial push-and-pull load and reciprocal swing transmission to the outer lane of the bearing that awaits measuring, do not influence the work of.

Compared with the prior art, the radial bearing test mechanism with the structure has the following beneficial effects:

(1) through setting up experimental axle subassembly and outer lane mounting, separate the inner circle and the outer lane of bearing that awaits measuring, especially the setting of outer lane mounting for apply radial push-and-pull load and reciprocal swing all can independently apply on the outer lane of bearing that awaits measuring to the bearing outer lane that awaits measuring, and can not lead to the fact interference and influence to the state of inner circle, thereby provide the structural basis for designing independent journal bearing test mechanism.

(2) Set up the tapered roller bearing of a pair of back-to-back installation between outer lane carrier assembly and radial loading seat, this setting to tapered roller bearing, its effect lies in: firstly, based on the bearing characteristics of the tapered roller bearing, the reciprocating swing applied by a swing assembly and the radial push-pull load applied by a radial loading assembly are separated in motion, so that the interference between the reciprocating swing and the radial push-pull load is avoided; the second step is as follows: based on the structural characteristic that the tapered roller bearings can bear unidirectional axial load, when the radial loading assembly bears the load in a unidirectional mode, one tapered roller bearing bears the unidirectional axial load, the other tapered roller bearing does not bear the axial load, and when the two tapered roller bearings are installed back to back, the radial push-pull load of the radial loading assembly can be effectively applied to the outer ring bearing assembly through the tapered roller bearings.

In the structure, the pair of tapered roller bearings arranged back to back realize the motion separation of radial push-pull load and reciprocating swing and the transmission of the radial push-pull load, has the technical advantages of simple structure and ingenious conception, and overturns the structural form of the traditional bearing test mechanism. Meanwhile, the simulated bearing test working condition is closer to the actual working condition, and the test result is more reliable.

Drawings

FIG. 1 is a schematic structural diagram of a radial bearing test mechanism according to this embodiment;

FIG. 2 is a schematic structural view of a test unit in this embodiment;

FIG. 3 is a schematic cross-sectional view of the test unit shown in FIG. 2;

FIG. 4 is a schematic diagram of the test cell of FIG. 2 in an exploded state;

FIG. 5 is a schematic structural view of the radial loading upper seat in the present embodiment;

FIG. 6 is a cross-sectional view of the radial loading upper housing of FIG. 5;

FIG. 7 is a schematic cross-sectional view of the test shaft assembly and the outer ring fixing member in this embodiment;

fig. 8 is a schematic cross-sectional view of the outer pouch in this embodiment;

fig. 9 is a schematic structural view of the inner fixing sleeve in the present embodiment;

fig. 10 is a schematic cross-sectional view of the inner fixing sleeve of the present embodiment;

FIG. 11 is a schematic structural diagram of a swing assembly in the present embodiment;

FIG. 12 is a schematic structural view of a swing shaft and spline housing of the swing assembly of FIG. 11;

FIG. 13 is a schematic structural diagram of a radial loading assembly in the present embodiment;

FIG. 14 is a cross-sectional structural view of the radial loading assembly of FIG. 13.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, integrally connected, or detachably connected; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art will understand the specific meaning of the above terms in the present invention in specific situations.

As shown in fig. 1, a radial bearing test mechanism of this embodiment includes a fixed table 400, a test unit 100 is disposed above the table, and there is no direct connection between the test unit 100 and the table 400.

Wherein, a radial loading assembly 300 is arranged below the workbench 400, the radial loading assembly 300 acts on one side of the test unit 100 close to the workbench, and under the action of the radial loading assembly 300, the test unit 100 can ascend and descend or have a tendency of ascending and descending in the vertical direction relative to the workbench 400.

Wherein, the test unit is provided with a swing assembly 200 at one side far away from the workbench, and the output end of the swing assembly 200 is connected to the test unit.

The test unit 100 of this embodiment, as shown in fig. 2-4, includes a test shaft assembly 110, an outer race fixture 120, an outer race carrier assembly, and a radial load seat.

As shown in fig. 7, the test shaft assembly 100 limits the inner ring 11 of the bearing to be tested 10, is used for limiting the inner ring of the bearing to be tested, and provides support for the inner ring of the bearing to be tested. It should be noted that, in this embodiment, a specific structure of the test shaft assembly 100 is not described in detail, which is not the invention point of this application, and various structures in the prior art may be adopted as long as the function of limiting and supporting the inner ring of the bearing to be measured is achieved.

As shown in fig. 4 and 7, the outer ring 12 of the bearing 10 to be measured is limited by the outer ring fixing member 120. The outer ring fixing member 120 includes a fixing ring 121 for being sleeved on the outer ring 12 of the bearing 10 to be tested, and a fixing rod 122 extending along a radial direction of the fixing ring 121.

In this embodiment, the device further includes an outer ring bearing assembly connected to the outer ring fixing member 120, and the outer ring bearing assembly is configured to bear a reciprocating swing load applied by the swing assembly and a radial push-pull load applied by the radial loading assembly, and transmit the reciprocating swing load and the radial push-pull load to the outer ring of the bearing to be tested through the outer ring fixing member 120.

A preferred embodiment wherein the outer ring carrier assembly comprises an inner hub 150 and an outer hub 180. In this embodiment, the structure of the inner fixing sleeve 150 is as shown in fig. 9 and 10, the inner fixing sleeve 150 is provided with an internal threaded hole 151 with an opening at one end, and correspondingly, the fixing rod 122 is provided with an external thread adapted to the internal threaded hole 151, and the fixing rod is in threaded connection with the inner fixing sleeve.

As a special feature of the present embodiment, the inner fixing sleeve 150 is provided with an external taper portion 152 on the opening side of the internal threaded hole 151, and the external taper portion 152 is provided with a plurality of through grooves 153 extending in the axial direction and penetrating the wall of the internal threaded hole in the circumferential direction; the end of the inner sleeve 150 remote from the external taper 152 is provided with a threaded end 154, and the threaded end 154 is provided with external threads.

The structure of the outer fixing sleeve 180 of this embodiment is shown in fig. 8, the outer fixing sleeve 180 is provided with a through hole 181 axially penetrating for accommodating the inner fixing sleeve 150, one end of the through hole 181 is provided with an inner cone 182 adapted to the outer cone 152, and the end far away from the inner cone is provided with a counter bore 183.

As shown in fig. 3 and 4, in the connection state of the outer and inner retainers 180 and 150, a washer 191 is placed in the counterbore 183, and a nut 192 is fittingly mounted on the threaded end 154. Since the through grooves 153 are formed in the circumferential direction of the external tapered portion 152, when the nut 192 is tightened, the external tapered portion 152 is moved toward the center by the inner tapered portion 182 and the external tapered portion 152 divided by the through grooves 153, and thus a great tightening force is applied to the fixing rod. This kind of connected mode for the outer lane holds the connection between carrier and the outer lane mounting very reliable, guarantees under the effect of continuous reciprocal swing and push-and-pull load, and the outer lane mounting can not take place to become flexible, position change etc. with being connected between the interior fixed cover.

As shown in fig. 8, the outer fixing sleeve 180 of this embodiment has an end cap 184 at an end where the counterbore 183 is located, and a connecting external thread 186 at an end away from the end cap 184. The end of the end cap 184 facing the connecting external thread 186 forms a limit end face 185 for abutting contact with the inner ring of the tapered roller bearing.

The radial loading shoe in this embodiment, as shown in fig. 2-4, includes a radially loaded upper shoe 140 and a radially loaded lower shoe 130 fixedly attached to each other. The connection mode is not limited to a bolt connection mode, a welding connection mode, a snap connection mode and other connection modes, and preferably, in the embodiment, the bolt connection mode and the snap connection mode are detachably connected.

Wherein the radial loading shoe 130 is provided with a receiving cavity 131, which receiving cavity 131 is used for receiving a test unit.

The structure of the radial loading upper seat 140 adapted to the radial loading lower seat 130 is shown in fig. 5 and 6, a through hole 143 for accommodating the outer fixing sleeve 180 is provided in the radial loading upper seat 140, and a first bearing mounting hole 141 and a second bearing mounting hole 142 for accommodating the tapered roller bearing 170 are respectively provided at two ends of the through hole 143.

In this embodiment, the radially loaded upper housing 140 is connected to the stationary outer sleeve 180 by a pair of tapered roller bearings 170 mounted back-to-back. The connection mode is as shown in fig. 3 and 4, wherein the inner ring end surface of one tapered roller bearing 170 abuts against the limit end surface 185 of the outer fixing sleeve 180, and the outer ring of the tapered roller bearing 170 is installed in the first bearing installation hole 141 of the radial loading upper seat 140. The outer ring of another tapered roller bearing 170 is mounted in the second bearing mounting hole 142 of the radial loading upper seat 140, and the inner ring of the tapered roller bearing 170 is sleeved on the outer fixing sleeve 180. An interval ring 190 sleeved on the outer fixed sleeve 180 is installed between the inner rings of the two tapered roller bearings 170, a sealing ring 193 is arranged on one side, away from the interval ring, of the inner ring of the tapered roller bearing on one side of the limiting end face, a locking nut 194 matched with the connecting external thread 186 is installed on one side, away from the tapered roller bearing 170, of the sealing ring 193, and the outer fixed sleeve 180, the radial loading upper seat 140, the pair of tapered roller bearings 170, the interval ring 190 and the sealing ring 193 are fixed together through the locking nut 194.

Preferably, in this embodiment, a seal cover 195 fixedly coupled to the radial upper seat 140 is provided on one side of the first bearing mounting hole 141, a seal ring 196 is provided between the seal cover 195 and the outer fixing sleeve 180, and the seal cover 195 and the seal ring 196 constitute a pair of seal structures to seal the first bearing mounting hole 141. Similarly, a seal structure including a seal cover 195 and a seal ring 196 is also provided on the second bearing mounting hole 142 side to seal the side.

Preferably, as shown in fig. 2 to 4, in the present embodiment, a pair of oppositely disposed mounting grooves 132 is disposed on a side where the radial loading lower seat 130 is connected to the radial loading upper seat 140, a supporting plate 133 is connected between the pair of oppositely disposed mounting grooves 132, and a supporting plate hole 134 penetrating through the supporting plate is disposed in a middle portion of the supporting plate 133. The supporting plate hole 134 is used for accommodating the outer ring fixing piece to pass through, and the purpose is that, in the installation process of the bearing 10 to be tested, after the outer ring fixing piece is in threaded connection with the inner fixing sleeve, the outer ring fixing piece is firstly kept at a position which is approximately vertically upward through the supporting plate hole 134, so that the outer fixing sleeve is prevented from toppling or changing positions, and the outer fixing sleeve is conveniently connected with the inner fixing sleeve.

As shown in fig. 11, the swing assembly 200 of the present embodiment includes a swing support base 210, and the swing support base 210 is fixedly disposed, and is generally fixedly disposed on the equipment rack.

In this embodiment, a swing shaft 220 is disposed on a side of the swing assembly 200 close to the test unit, a swing flange 222 for connecting with the outer fixing sleeve 180 is disposed at one end of the swing shaft, and the swing flange 222 is fixedly connected with the end cover 184 for transmitting the reciprocating swing of the swing assembly to the outer ring bearing assembly.

As shown in fig. 11 to 12, in the present embodiment, the other end of the swing shaft 220 is a spline shaft 221, and a spline housing 223 adapted to be connected to the spline shaft 221 is connected to the swing support 220 through a spline connection shaft 260. Preferably, the spline housing 223 is a ball spline, which is internally provided with a plurality of rows of balls 225, and the ball spline is matched with the spline grooves 224 on the spline shaft 221, and has the advantage of smaller friction resistance.

This integral key shaft and spline housing's effect lies in, when the outer lane of bearing that awaits measuring receives and takes place radial displacement behind the radial push-and-pull load, and the axial displacement of the relative spline housing of integral key shaft is used for eliminating above-mentioned displacement to do not influence other subassemblies such as swing jar. Meanwhile, reciprocating swing generated by the swing cylinder can be transmitted through the ball and the spline groove.

Wherein, the swing support base 210 is provided with a connecting flange 211, and the spline connecting shaft 260 is rotatably and movably connected with the connecting flange 211. The other side of the swing support base 210 is provided with a swing cylinder 240, the swing cylinder 240 is fixed on the swing support base 210 through a connecting plate 212, an output shaft of the swing cylinder 240 is connected with a spline connecting shaft 260, and preferably, a torque sensor 230 is arranged between the output shaft of the swing cylinder 240 and the spline connecting shaft 260 for monitoring and controlling output reciprocating swing.

In addition, an encoder assembly 250 is further disposed at an end of the swing cylinder 240 away from the swing support base, and is used for acquiring data and controlling a working state of the swing cylinder.

As shown in fig. 13-14, the radial load assembly 300 of the present embodiment includes a fixedly disposed load bearing support 310, and the load bearing support 310 is generally fixedly mounted to the frame. One side of the loading support seat 310, which is far away from the workbench, is fixedly connected with a linear loading cylinder 320, a piston rod 330 is arranged in the linear loading cylinder 320, the piston rod 330 is axially and movably connected with the linear loading cylinder, and the expansion and contraction of the piston rod 330 is used for applying a radial bidirectional push-pull load of the bearing to be tested.

The radial loading assembly 300 further includes a linear loading rod 350, one end of the linear loading rod 350 is connected to the piston rod 330 through a tension/pressure sensor 340, and the other end passes through the worktable 400 and is fixedly connected to the lower radial loading seat 130. The pull pressure sensor 340 is used for collecting and monitoring the linear loading force.

In this embodiment, the free end of the linear loading cylinder 320 is provided with a fixed plate 370, and the free end of the piston rod is provided with a movable plate 371 matched with the fixed plate. Wherein, be equipped with displacement sensor 360 between fixed plate and the fly leaf for gather, monitor linear displacement.

In addition, in order to prevent the piston rod from rotating along the axis relative to the linear loading cylinder, an anti-rotation mechanism is arranged between the fixed plate and the movable plate, and the anti-rotation mechanism comprises a guide rod 380 fixedly connected with the fixed plate and a guide sleeve 381 arranged on the movable plate.

In conclusion, the above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.