JP2021148582A - Tester of cage - Google Patents

Abstract

To provide a tester of a cage which can perform a test at further higher accuracy.SOLUTION: A tester of a cage of a roller bearing having an outer ring has: an outer ring raceway surface at an internal peripheral face; an inner ring having an inner ring raceway surface at an external peripheral face; a plurality of rolling bodies interposed between the outer ring raceway surface and the inner ring raceway surface; and the cage having a plurality of pockets for accommodating the plurality of rolling bodies with intervals in a peripheral direction. The tester of the cage comprises: an outer ring jig having the same shape as that of the outer ring raceway surface at least at a part of an internal peripheral face; an inner ring jig having the same shape as that of the inner ring raceway surface at least at a part of an external peripheral face; a first contact face accommodated in a first pocket of the cage, and contacting with the cage; a first fixing part for fixing the first contact part to the internal peripheral face of the outer ring jig; a second contact part accommodated in a second pocket of the cage different from the first pocket, and contacting with the cage; a second fixing part for fixing the second contact part to the external peripheral face of the inner ring jig; and a drive part for relatively reciprocating the inner ring jig with respect to the outer ring jig in the peripheral direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a cage test device.

Test devices for evaluating the fatigue strength of rolling bearing cages are known. For example, in Patent Document 1, one jig is inserted into each of the two pockets of the cage to be tested, and one jig is fixed and the other jig is reciprocated. As a result, a technique for applying a stress simulating the reciprocating stress caused by the advance / delay of the rolling element to the cage is disclosed.

Japanese Patent Application Laid-Open No. 2003-57151

It is required to perform a test with higher accuracy in a test device for performing a fatigue test of a cage. In order to meet this demand, it is conceivable to apply a stress to the cage that is closer to the actual operating conditions in the test equipment. In actual use of rolling bearings, the cage is dominated by repeated stresses of tension and compression due to the advance and lag of the rolling elements. Therefore, it is important to more faithfully simulate the stress in the test apparatus.

In order to solve this problem, the present inventor examined a part different from the actual usage conditions in the test apparatus according to Patent Document 1, and found the following two differences. In the test apparatus according to Patent Document 1, two jigs are inserted into the pockets of the cage from the outside in the radial direction, one jig is connected to the moving portion, and the reciprocating motion is given to the jig as it is. Therefore, in the test apparatus according to Patent Document 1, it is necessary to incorporate a cage to be measured between the inner ring and the outer ring, which are partially cut out so that a plurality of jigs can be inserted. Further, the jig simulating the rolling element moves not in the circumferential direction of the bearing but in the tangential direction with respect to the circumference of the bearing. As a result of these differences, the cage to be measured in the test apparatus according to Patent Document 1 has different usage conditions from the cage when the rolling bearing is actually used.

Therefore, an object of the present invention is to provide a cage test apparatus capable of performing a more accurate test by applying a stress closer to the actual operating conditions to the cage.

(1) The test device for the cage of the present invention is interposed between an outer ring having an outer ring raceway surface on the inner peripheral surface, an inner ring having an inner ring raceway surface on the outer peripheral surface, and the outer ring raceway surface and the inner ring raceway surface. A test device for the cage of a rolling bearing, comprising a plurality of rolling elements and a cage having a plurality of pockets for accommodating the plurality of rolling elements at intervals in the circumferential direction, at least a part thereof. An outer ring jig having an inner peripheral surface having the same shape as the outer ring raceway surface, an inner ring jig having at least a part of the outer peripheral surface having the same shape as the inner ring raceway surface, and an inner ring jig having the same shape as the inner ring raceway surface are housed in the first pocket of the cage. The first contact portion that comes into contact with the cage, the first fixing portion that fixes the first contact portion to the inner peripheral surface of the outer ring jig, and the second of the cage that is different from the first pocket. A second contact portion that is housed in a pocket and contacts the cage, a second fixing portion that fixes the second contact portion to the outer peripheral surface of the inner ring jig, and the inner ring jig with respect to the outer ring jig. It is provided with a drive unit that reciprocates relatively in the circumferential direction.

According to the test device for the cage of the present invention, the drive unit reciprocates the inner ring jig (or outer ring jig) in the circumferential direction, so that the drive unit moves back and forth between the first contact portion and the second contact portion in the circumferential direction. A force acts to move away from or approach the circumferential direction. As a result, a force that separates or approaches the circumferential direction acts between the first pocket and the second pocket on the cage. As a result, with respect to the stress caused by the advance / delay of the rolling element, a stress closer to the actual operating conditions can be applied to the cage, so that a more accurate test can be performed.

(2) Preferably, the first region of the first contact portion that comes into contact with the cage has the same shape as the shape of the region corresponding to the first region of the outer peripheral surface of the rolling element. The second region of the second contact portion that comes into contact with the cage has the same shape as the region of the outer peripheral surface of the rolling element that corresponds to the second region.

With this configuration, the first region and the second region in contact with the cage have the same shape as the outer peripheral surface of the rolling element, respectively, so that the stress caused by the advance / delay of the rolling element can be used more practically. A stress close to the condition can be applied to the cage.

(3) Preferably, the first fixing portion is fitted into the first groove provided on the inner peripheral surface of the outer ring jig and the second groove provided on the first contact portion, respectively. The first contact portion is provided on the outer peripheral surface of the inner ring jig to have a first rod member or a first plate material for fixing the first contact portion to the inner peripheral surface of the outer ring jig. A second rod member that fixes the second contact portion to the outer peripheral surface of the inner ring jig by fitting the third groove and the fourth groove provided in the second contact portion, respectively. Or it has a second plate material.

With this configuration, the cage is arranged in the space formed by the inner peripheral surface of the outer ring jig and the outer peripheral surface of the inner ring jig without cutting out a part of the outer ring jig and the inner ring jig. Therefore, a stress closer to the actual operating conditions can be applied to the cage.

(4) Preferably, the rolling element is about to rotate around the central axis of the rolling element when rolling, and the first contact portion has the same length in the central axis direction as the rolling element. The first fixing portion is a plurality of the first rod members located at intervals of half or more of the length of the first contact portion in the central axis direction, or the first contact portion. It has the first plate material having a width of more than half of the length in the central axis direction.

With this configuration, it is possible to prevent the first contact portion from tilting from a predetermined position. As a result, the first contact portion can be brought into contact with the cage at a fixed position, so that the variation in the test results can be further reduced. Therefore, a more accurate test can be performed.

(5) Preferably, at least one of the first fixing portion and the second fixing portion tilts at least one of the first contact portion and the second contact portion from the posture of the rolling element which is normally held. In this state, it is fixed to at least one of the inner peripheral surface of the outer ring jig and the outer peripheral surface of the inner ring jig.

With this configuration, at least one of the first contact portion and the second contact portion can be brought into contact with the cage in a state of having a predetermined inclination, so that the rolling element advances and lags when the rolling element is skewed. A stress simulating the stress caused by the above can be applied to the cage. Thereby, more various usage conditions can be reproduced.

(6) Preferably, a detection unit for detecting a load acting on the cage from the drive unit via at least one of the first contact portion and the second contact portion is further provided. With this configuration, not only fatigue strength evaluation (number of loads until breakage) but also evaluation based on the load acting on the cage can be performed.

According to the present invention, a test with higher accuracy can be performed.

It is sectional drawing which shows an example of the bearing including the cage which is tested by the test apparatus which concerns on embodiment of this invention. It is a perspective view which looked at the cage which becomes a subject diagonally from above. It is a front view which shows the test apparatus of the cage which concerns on embodiment. It is sectional drawing which shows the test apparatus cut by the cutting line IV of FIG. It is a perspective view which looked at the outer ring jig which concerns on embodiment from diagonally above. It is a perspective view which looked at the 1st rolling element jig which concerns on embodiment from diagonally above. It is sectional drawing which shows the 1st and 2nd rolling element jig and the cage which concerns on embodiment. It is a perspective view which looked at the inner ring jig which concerns on embodiment from diagonally above. It is a front view which shows the inner ring jig seen from the arrow IX of FIG. It is a schematic diagram explaining the rotation operation by the drive part which concerns on embodiment. It is a perspective view which shows the 1st rolling element jig which concerns on a modification. It is sectional drawing which shows the 1st and 2nd rolling element jigs and a cage which concerns on a modification.

<Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Explanation of cage>
The cage 90 tested by the test apparatus according to the embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing an example of a rolling bearing 8 including a cage 90.

The rolling bearing 8 includes an outer ring 81, an inner ring 82, a plurality of rolling elements 83, and a cage 90. The outer ring 81 and the inner ring 82 are both annular members. The outer ring 81 has an outer ring raceway surface 81a on the inner peripheral surface. The inner ring 82 has an inner ring raceway surface 82a on the outer peripheral surface. The plurality of rolling elements 83 are interposed between the outer ring raceway surface 81a and the inner ring raceway surface 82a. In this embodiment, the rolling element 83 is a "tapered roller".

Here, the direction along the center line C1 of the rolling bearing 8 (hereinafter, referred to as "bearing center line C1") is the axial direction of the rolling bearing 8, and is referred to as the "first axial direction". The first axial direction also includes a direction parallel to the bearing center line C1. The left side in FIG. 1 is referred to as "one side" in the first axial direction, and the right side in FIG. 1 is referred to as "the other side" in the first axial direction. The direction orthogonal to the bearing center line C1 is the radial direction of the rolling bearing 8, and is simply referred to as the "diameter direction". The direction in which the rolling bearing 8 rotates around the bearing center line C1 is the circumferential direction of the rolling bearing 8, and is simply referred to as the "circumferential direction".

FIG. 2 is a perspective view showing the cage 90 and the plurality of rolling elements 83 as viewed from diagonally above. The cage 90 is provided between the annular portions 91a and 91b located on one side and the other side in the first axial direction, respectively, and a plurality of annular portions 91a and 91b provided at equal intervals in the circumferential direction. It has a pillar portion 92 and.

A pocket 93 is formed between the pillar portions 92 adjacent to each other to accommodate a plurality of rolling elements 83 in a rollable state. That is, the cage 90 has a plurality of pockets 93 for accommodating the plurality of rolling elements 83 at intervals in the circumferential direction.

When the rolling bearing 8 rotates, the rolling element 83 rolls in the circumferential direction. At this time, the rolling element 83 rotates around the center line C2 of the rolling element 83 (hereinafter, referred to as “rolling body center line C2”). Hereinafter, the direction along the rolling element center line C2 is referred to as a "second axial direction". In the example of FIG. 1, the second axial direction is inclined with respect to the first axial direction. The rolling element 83 is not limited to the “tapered roller”, and may be, for example, a “cylindrical roller”. When the rolling element 83 is a cylindrical roller, the second axial direction may be parallel to the first axial direction.

<Explanation of test equipment>
FIG. 3 is a front view showing the test apparatus 1 according to the embodiment of the present invention. FIG. 4 is a cross-sectional view showing the test apparatus 1 cut by the cutting line IV of FIG. The test device 1 is a test device for evaluating the fatigue strength of the cage 90.

The test device 1 includes an outer ring jig 2, an inner ring jig 3, a first rolling element jig 4, a second rolling element jig 5, a drive unit 6, and a base 7. The cage 90 is fixed from the radial outside by the first rolling element jig 4, and fixed from the radial inside by the second rolling element jig 5, and the inner peripheral surface 21 and the inner ring of the outer ring jig 2 are fixed. It is arranged between the outer peripheral surface 35 of the first portion 33, which will be described later, of the jig 3. Of the plurality of pockets 93 of the cage 90, the pocket 93 containing the first contact portion 41 (FIG. 6) of the first rolling element jig 4 and the second contact portion 51 of the second rolling element jig 5 (FIG. 6). The rolling elements 83 are housed in the pockets 93 other than the first pocket 93a and the second pocket 93b (see FIG. 7).

As shown in FIG. 4, the center lines of the outer ring jig 2 and the inner ring jig 3 are common to the bearing center line C1 (FIG. 1) of the rolling bearing 8 including the cage 90. Hereinafter, the center lines of the outer ring jig 2 and the inner ring jig 3 are also referred to as "bearing center line C1", and the direction along the bearing center line C1 is referred to as "first axial direction".

The base 7 has a base portion 71 and a base bearing 72. The base portion 71 has a cylindrical groove 71a. The base bearing 72 is a bearing having an outer ring, an inner ring, and a rolling element. The base bearing 72 is fixed to the base portion 71 by fitting the outer peripheral surface of the outer ring to the inner peripheral surface of the cylindrical groove 71a. That is, in the base bearing 72, the outer ring is a fixed ring and the inner ring is a rotating wheel.

The outer ring jig 2 is fixed to the base portion 71 with screws or the like (not shown). The inner ring jig 3 is fixed to the base bearing 72 in a state of being rotatable around the bearing center line C1 by fitting the outer peripheral surface of the support shaft 31, which will be described later, to the inner peripheral surface of the inner ring of the base bearing 72. ..

FIG. 5 is a perspective view showing the outer ring jig 2 viewed from diagonally above. The outer ring jig 2 is an annular member. A rectangular first groove 22 is provided on the inner peripheral surface 21 of the outer ring jig 2. At least a part of the inner peripheral surface 21 has the same shape as the outer ring raceway surface 81a (FIG. 1) of the outer ring 81. In the present embodiment, the region of the inner peripheral surface 21 excluding the first groove 22 has the same shape as the inner peripheral surface of the outer ring 81.

FIG. 6 is a perspective view showing the first rolling element jig 4 viewed from diagonally above. The first rolling element jig 4 has a first contact portion 41 and a first fixing portion 42. The first contact portion 41 is a member of the first rolling element jig 4 that is housed in the pocket 93 (first pocket 93a) of the cage 90 and comes into contact with the cage 90.

A rectangular second groove 44 is provided on the outer peripheral surface 43 of the first contact portion 41. The region of the outer peripheral surface 43 of the first contact portion 41 excluding the second groove 44 has the same shape as the outer peripheral surface of the rolling element 83 (the shape of a cone). That is, the first contact portion 41 is different from the rolling element 83 in that the second groove 44 is provided, and has a configuration common to the rolling body 83 in other points. Therefore, the first contact portion 41 and the rolling element 83 have the same length in the direction along the rolling element center line C2.

The first fixing portion 42 has a first plate member 45 having a rectangular parallelepiped shape, and a screw (not shown) screwed into the first plate member 45. The width W1 in the direction along the rolling element center line C2 of the first plate member 45 is more than half of the width W2 in the direction along the rolling element center line C2 of the first contact portion 41 and is not more than half the width W2 (W2 / 2 ≦ W1 ≦ W2). ).

As shown in FIG. 3, in the first fixing portion 42, one end of the first plate material 45 is fitted into the first groove 22 of the outer ring jig 2, and the other end of the first plate material 45 is the first contact portion. By fitting into the second groove 44 of 41, the first contact portion 41 is fixed to the inner peripheral surface 21 of the outer ring jig 2. The outer ring jig 2, the first contact portion 41, and the first plate material 45 are fixed to each other in a detachable state by screws.

FIG. 7 is an enlarged cross-sectional view showing only the cage 90, the first rolling element jig 4, and the second rolling element jig 5 described later in the cross section cut by the arrow VII of FIG. The first contact portion 41 is housed in the first pocket 93a of the cage 90. Of the outer peripheral surface of the first contact portion 41, the region in contact with the cage 90 (specifically, the pillar portion 92) is referred to as "first region R1".

FIG. 8 is a perspective view showing the inner ring jig 3 viewed from diagonally above. FIG. 9 is a front view showing the inner ring jig 3 as seen from the arrow IX of FIG. The inner ring jig 3 has a support shaft 31 and a large diameter portion 32. The support shaft 31 is a member having a cylindrical shape that is long in the axial direction. The end portion of the support shaft 31 on one side in the first axial direction is connected to the large diameter portion 32.

The large diameter portion 32 has a first portion 33 having the shape of a cone and a second portion 34 having the shape of a cylinder. The first portion 33 is located on the other side of the large diameter portion 32 in the first axial direction and is connected to the support shaft 31. The second portion 34 is located on one side of the large diameter portion 32 in the first axial direction and is connected to the drive portion 6. The diameter of the large diameter portion 32 is larger than the diameter of the support shaft 31. The center lines of the support shaft 31, the first portion 33, and the second portion 34 are common to the bearing center line C1. That is, the support shaft 31 and the large diameter portion 32 are located on the same center line as each other.

The outer peripheral surface 35 of the first portion 33 is provided with a rectangular third groove 36 and a plurality of screw holes 37. The third groove 36 is provided over the entire axial direction of the large diameter portion 32. That is, the third groove 36 is provided in the first portion 33 and the second portion 34. The third groove 36 may be provided only in the first portion 33. The screw hole 37 is a through hole provided in a direction perpendicular to the third groove 36, and is opened in the outer peripheral surface 35 and the third groove 36, respectively. As shown in FIG. 8, a second plate material 55, which will be described later, is fitted into the third groove 36, and by connecting a screw (not shown) from the screw hole 37 to the second plate material 55, the second plate material 55 is fitted with an inner ring jig. It is fixed to the tool 3.

At least a part of the outer peripheral surface 35 has the same shape as the inner ring raceway surface 82a (FIG. 1) of the inner ring 82. In the present embodiment, the region of the outer peripheral surface 35 excluding the third groove 36 and the plurality of screw holes 37 has the same shape as the inner peripheral surface of the inner ring 82.

Two surfaces 38 on one side in the first axial direction of the large diameter portion 32 (that is, the bottom surface of the cylindrical shape of the second portion 34 on one side in the first axial direction) are recessed on the other side in the first axial direction. Threaded grooves 39a and 39b are formed. The screw grooves 39a and 39b are formed at positions radially separated from the bearing center line C1, respectively. Further, as shown in FIG. 9, the screw groove 39a is formed at a position rotated 180 degrees with respect to the screw groove 39b about the bearing center line C1. That is, the screw grooves 39a and 39b are formed at positions symmetrical with respect to the bearing center line C1.

The second rolling element jig 5 has the same shape as the first rolling element jig 4 shown in FIG. For this reason, each part of the second rolling element jig 5 is indicated by reference numerals in parentheses in FIG. The second rolling element jig 5 has a second contact portion 51 and a second fixing portion 52. The outer peripheral surface 53 of the second contact portion 51 is provided with a rectangular fourth groove 54, similarly to the second groove 44 of the first contact portion 41.

The second fixing portion 52 has a second plate member 55 having a rectangular parallelepiped shape, and a screw (not shown) screwed into the second plate member 55. The width of the second plate member 55 in the second axial direction is equal to or less than half the width of the second contact portion 51 in the second axial direction. As shown in FIG. 3, in the second fixing portion 52, one end portion of the second plate member 55 is fitted into the third groove 36 of the inner ring jig 3, and the other end portion of the second plate member 55 is the second contact portion. By fitting into the fourth groove 54 of 51, the second contact portion 51 is fixed to the outer peripheral surface 35 of the first portion 33 of the inner ring jig 3. The inner ring jig 3, the second contact portion 51, and the second plate member 55 are fixed to each other in a detachable state by screws.

See FIG. 7. The second contact portion 51 is housed in the second pocket 93b of the cage 90. In the present embodiment, the second pocket 93b is a pocket 93 adjacent to the first pocket 93a. However, the second pocket 93b may be two or more pockets 93 separated from the first pocket 93a. That is, the second pocket 93b may be a pocket 93 different from the first pocket 93a. Of the outer peripheral surface of the second contact portion 51, the region in contact with the cage 90 (specifically, the pillar portion 92) is referred to as "second region R2".

See FIG. The drive unit 6 has a moving member 61 and an arm 62. The moving member 61 is connected to an actuator (not shown), and the actuator reciprocates in the direction of the arrow AR1 in FIG.

The arm 62 connects the moving member 61 and the inner ring jig 3. An elongated hole 63 is formed at the end of the arm 62 on the moving member 61 side. The arm 62 is connected to the moving member 61 by fixing the screw 64 passed through the elongated hole 63 to the moving member 61. An elongated hole 65 is formed at the end of the arm 62 on the inner ring jig 3 side. Further, a round hole 66 is formed on the moving member 61 side of the elongated hole 65 of the arm 62. In the arm 62, the screw 67 passed through the elongated hole 65 is fixed to the screw groove 39a of the inner ring jig 3, and the screw 68 passed through the round hole 66 is fixed to the screw groove 39b of the inner ring jig 3. It is connected to the jig 3.

The movement of the arm 62 in the first axial direction is restricted by screws 64, 67, 68. On the other hand, the arm 62 is connected to the inner ring jig 3 and the moving member 61 in a state of being rotatable around the screws 64, 67, 68. Further, the arm 62 can move in the radial direction and the circumferential direction within the length range of the elongated holes 63 and 65.

FIG. 10 is a schematic view illustrating the rotational operation of the inner ring jig 3 by the drive unit 6. FIG. 10A shows a state in which the moving member 61 is moved downward by the arrow AR1 by the actuator, and FIG. 10B is a case where the moving member 61 is moved upward by the arrow AR1 by the actuator. Show the situation. In FIG. 10, in order to explain the operation of the drive unit 6, the inner ring jig 3, the first rolling element jig 4, and the second rolling element jig 5, other members are appropriately omitted. Further, in FIG. 10, in order to explain the state of the fatigue test of the cage 90, the deformation of the cage 90 is emphasized and shown.

As shown in FIG. 10A, when the moving member 61 moves downward by the arrow AR1, the arm 62 rotates clockwise around the screw 68, and the end of the arm 62 on the inner ring jig 3 side Move upwards. The movement of the arm 62 is transmitted to the inner ring jig 3 via the screw 67, and the inner ring jig 3 rotates clockwise in the circumferential direction (arrow AR2 in FIG. 10A).

As a result, the second rolling element jig 5 fixed to the inner ring jig 3 also rotates in the direction of the arrow AR2. Since the first rolling element jig 4 is fixed to the outer ring jig 2 and does not move, the second contact portion 51 moves in a direction away from the first contact portion 41. As a result, a force (tensile force) pulled by the first contact portion 41 and the second contact portion 51 acts between the first pocket 93a and the second pocket 93b of the cage 90.

As shown in FIG. 10B, when the moving member 61 moves upward by the arrow AR1, the arm 62 rotates counterclockwise around the round hole 66, and the end of the arm 62 on the inner ring jig 3 side. The part moves downward. The movement of the arm 62 is transmitted to the inner ring jig 3 via the screw 67, and the inner ring jig 3 rotates in the circumferential counterclockwise direction (arrow AR3 in FIG. 10B).

As a result, the second rolling element jig 5 fixed to the inner ring jig 3 also rotates in the direction of the arrow AR3, and the second contact portion 51 moves in the direction approaching the first contact portion 41. As a result, a force (compressive force) that is compressed by the first contact portion 41 and the second contact portion 51 acts between the first pocket 93a and the second pocket 93b of the cage 90. As described above, the moving member 61 and the arm 62 have a function as a crank that converts the linear reciprocating motion of the actuator into the rotational motion of the inner ring jig 3.

When the fatigue test of the cage 90 is performed by the test device 1, the actuator repeatedly moves the moving member 61 in the upward and downward directions of the arrow AR1. As a result, the inner ring jig 3 reciprocates with respect to the outer ring jig 2 in the circumferential direction. Then, the tensile force and the compressive force of the first contact portion 41 and the second contact portion 51 simulating the rolling element 83 repeatedly act on the cage 90. Therefore, in the test apparatus 1, the repetitive stress due to the advance / delay of the rolling element 83 can be simulated more faithfully.

<Operation / effect of test equipment>
The operation and effect of the test apparatus 1 according to the present embodiment will be described. As shown in FIG. 10, in the test apparatus 1, the first rolling element jig 4 and the second rolling element jig 5 can repeatedly apply a tensile force and a compressive force to the cage 90. In particular, since the drive unit 6 converts the reciprocating motion of the actuator into a rotational motion in the circumferential direction and transmits it to the inner ring jig 3, the second contact portion 51 also moves in the circumferential direction with respect to the first contact portion 41. Therefore, the direction in which the rolling element 83 advances and lags (circumferential direction) when the rolling bearing 8 is actually used can be faithfully simulated by the first contact portion 41 and the second contact portion 51. As a result, with respect to the stress caused by the advance / delay of the rolling element 83, a stress closer to the actual operating conditions can be applied to the cage 90.

In the test apparatus 1, the first region R1 (FIG. 7) of the first contact portion 41 in contact with the cage 90 has the same shape as the shape of the region corresponding to the first region R1 on the outer peripheral surface of the rolling element 83. Has. Further, the second region R2 (FIG. 7) of the second contact portion 51 in contact with the cage 90 has the same shape as the shape of the region corresponding to the second region R1 on the outer peripheral surface of the rolling element 83. Therefore, the first contact portion 41 and the second contact portion 51 can come into contact with the cage 90 in the same manner as the rolling element 83, and the stress caused by the advance / delay of the rolling body 83 can be adjusted to more actual usage conditions. A close stress can be applied to the cage 90.

In the test device 1, the first contact portion 41 on the fixed side is fixed to the outer ring jig 2 located on the radial outer side of the first contact portion 41 by the first fixing portion 42, and the second contact portion on the moving side. The 51 is fixed to the inner ring jig 3 located inside the second contact portion 51 in the radial direction by the second fixing portion 52. Therefore, the cage 90 is placed in the space formed by the inner peripheral surface 21 of the outer ring jig 2 and the outer peripheral surface 35 of the inner ring jig 3 without cutting out a part of the outer ring jig 2 and the inner ring jig 3. Can be placed. That is, the inner peripheral surface 21 and the outer peripheral surface 35 are arranged over the entire circumference of the cage 90. As a result, a repetitive stress closer to the actual usage conditions can be applied to the cage 90.

In the test apparatus 1, the width W2 of the first contact portion 41 in the second axial direction is the same as the width of the rolling element 83 in the second axial direction, and the width W1 of the first fixing portion 42 in the second axial direction is It is more than half of the width W2 of the first contact portion 41. Therefore, when the fatigue test is performed, it is possible to prevent the first contact portion 41 from tilting (skew) in the second axial direction, and the first contact portion 41 and the cage 90 are brought into contact with each other at a fixed position. be able to. As a result, the variation in the test results can be further reduced. Since the second rolling element jig 5 has the same shape as the first rolling element jig 4, it has the same action and effect as the first rolling element jig 4.

<Modification example>
The test apparatus 1 according to the embodiment of the present invention has been described above. However, the practice of the present invention is not limited to this, and various modifications can be made. Hereinafter, a modified example according to the embodiment of the present invention will be described. In the following description, the same reference numerals will be given to the parts that are not changed from the embodiments, and the description thereof will be omitted.

<Modification examples of the first and second rolling element jigs>
FIG. 11 is an explanatory view showing the first rolling element jigs 4a and 4b according to the modified example. See FIG. 11 (a). The first rolling element jig 4a has a first contact portion 41 and a first fixing portion 42a. The second fixing portion 42a has two first rod members 45a and 45b. As described above, the first fixing portion may have the first bar material instead of the first plate material.

Here, the first rod members 45a and 45b are located apart from each other in the second axial direction. The distance W3 from one end of the first bar 45a in the second axial direction to the other end of the first bar 45b in the second axial direction is more than half the width W2 of the first contact portion 41. With this configuration, it is possible to prevent the first contact portion 41 from tilting (skew) from a predetermined position, and the first contact portion 41 can be brought into contact with the cage 90 at a fixed position. As a result, the variation in the test results can be further reduced.

The number of rods may be two or three or more as shown in FIG. 11A. Further, although the first rolling element jig has been described with reference to FIG. 11A, the second rolling element jig may also have the same shape. That is, the second rolling element jig may have a plurality of second rod members.

See FIG. 11 (b). The test apparatus 1 according to the above embodiment tests the cage 90 of the rolling bearing 8 using a “tapered roller” as the rolling element 83. However, the test device may test a cage for rolling bearings (ball bearings) that use "balls" as rolling elements. The first rolling element jig 4b shown in FIG. 11B is an example of the first rolling element jig when testing a cage for ball bearings. The first rolling element jig 4b has a first contact portion 41b and a first fixing portion 42b. The first contact portion 41b has a spherical shape, and the first fixing portion 42b is a single rod material.

In the above embodiment, the first fixed portion 42 has the first contact portion 41 in the outer ring in a state where the posture of the first contact portion 41 is the same as the posture of the rolling element 83 normally held by the cage 90. It is fixed to the inner peripheral surface 21 of the jig 2. However, the first fixing portion 42 tilts the posture of the first contact portion 41 from the posture of the rolling element 83 normally held by the cage 90, and makes the first contact portion 41 the inner circumference of the outer ring jig 2. It may be fixed to the surface 21. For example, by providing the second groove 44 of the first contact portion 41 in a state of being tilted from the second axial direction, the posture of the first contact portion 41 can be tilted.

With this configuration, the rolling element 83 can be tilted because the first contact portion 41 can be brought into contact with the cage 90 in a state where the first contact portion 41 has a predetermined inclination with respect to the cage 90. A stress simulating the stress caused by the advance / delay of the rolling element in the (skewed) state can be applied to the cage 90. Thereby, more various usage conditions can be reproduced. In the same manner as described above, the second fixing portion 42 may be fixed to the outer peripheral surface 35 of the inner ring jig 3 in a state where the second contact portion 42 is tilted from the posture of the rolling element 83 in which the second contact portion 42 is normally held. ..

FIG. 12 is a partial cross-sectional view showing a test apparatus according to another modified example. FIG. 12 shows a cross section similar to that of FIG. In this modification, the pressure sensor 46 is provided in the portion of the first contact portion 41 including the first region R1. Further, a pressure sensor 56 is provided in a portion of the second contact portion 51 including the second region R2.

The pressure sensors 46 and 56 are sensors that detect pressure, respectively. The pressure sensors 46 and 56 function as a detection unit that detects a load acting on the cage 90 from the drive unit 6 via the second contact unit 51. As shown in FIG. 10A, the second contact portion 51 is rotated in the direction of the arrow AR2 by the drive unit 6, and the first region of the first contact portion 41 and the second region R2 of the second contact portion 51 are rotated. When they come into contact with the cage 90, the pressure sensors 46 and 56 shown in FIG. 12 detect the load acting on the cage 90. In the above embodiment, the fatigue strength of the cage 90 is evaluated mainly by the number of repetitions (number of loads) of the tensile force and the compressive force until the cage 90 is broken. In this modification, in addition to this fatigue strength evaluation, an evaluation based on the load acting on the cage 90 can be performed.

<Modification example of cage>
In the above embodiment, the cage 90 is a so-called "punched" cage, but may be a cage of other shapes. For example, the cage may be a "punch-type" cage or a "crown-type" cage. Since each of the cages has a plurality of pockets for accommodating the rolling elements, the cage fatigue test can be performed by accommodating the first contact portion and the second contact portion in the pockets. ..

<Modification example of drive unit>
In the above embodiment, the drive unit 6 converts the linear reciprocating motion of the actuator into a rotational motion in the circumferential direction, and rotates the second rolling element jig 5 in the directions of arrows AR2 and AR3. However, the drive unit may be a motor connected to the support shaft 31 of the inner ring jig 3 and may directly rotate the inner ring jig 3 without going through the moving member 61 or the arm 62.

Further, the drive unit may have a configuration in which the inner ring jig 3 is fixed and the outer ring jig 2 is rotated. Further, both the outer ring jig 2 and the inner ring jig 3 may be rotated. The drive unit may have a configuration in which the inner ring jig 3 is reciprocated in the circumferential direction relative to the outer ring jig 2.

The embodiments disclosed as described above are exemplary in all respects and are not restrictive. That is, the rolling bearing of the present invention is not limited to the illustrated form, and may have other forms within the scope of the present invention.

1 Test equipment 2 Outer ring jig 21 Inner peripheral surface 22 1st groove 3 Inner ring jig 31 Support shaft 32 Large diameter part 33 1st part 34 2nd part 35 Outer surface surface 36 3rd groove 37 Screw hole 38 surface 39a, 39b Screw Groove 4 1st rolling element jig 41 1st contact part 42 1st fixed part 43 outer peripheral surface 44 2nd groove 45 1st plate material 5 2nd rolling element jig 51 2nd contact part 52 2nd fixed part 53 outer peripheral surface 54 4th groove 55 2nd plate 6 Drive part 61 Moving member 62 Arm 63, 65 Long hole 64, 67, 68 Screw 66 Round hole 7 Base 71 Base 72 Base bearing 8 Bearing 81 Outer ring 81a Outer ring Raceway surface 82 Inner ring 82a Inner ring Track surface 83 Rolling element 90 Cage 91a, 91b Ring part 92 Pillar part 93 Pocket 93a First pocket 93b Second pocket AR1 Arrow AR2 Arrow AR3 Arrow C1 Bearing center line C2 Rolling body center line R1 First area R2 Second area W1 (of the first plate 45) width W2 (of the first contact portion 41) width

Claims (6)

An outer ring having an outer ring raceway surface on the inner peripheral surface, an inner ring having an inner ring raceway surface on the outer peripheral surface, a plurality of rolling elements interposed between the outer ring raceway surface and the inner ring raceway surface, and a plurality of the rolling elements. A test device for the cage of a rolling bearing, comprising a cage having a plurality of pockets for accommodating each of them at intervals in a direction.
An outer ring jig having at least a part of the inner peripheral surface having the same shape as the outer ring raceway surface,
An inner ring jig having at least a part of the outer peripheral surface having the same shape as the inner ring raceway surface,
A first contact portion housed in the first pocket of the cage and in contact with the cage,
A first fixing portion for fixing the first contact portion to the inner peripheral surface of the outer ring jig, and a first fixing portion.
A second contact portion housed in a second pocket of the cage different from the first pocket and in contact with the cage, and
A second fixing portion for fixing the second contact portion to the outer peripheral surface of the inner ring jig, and a second fixing portion.
A drive unit that reciprocates the inner ring jig in the circumferential direction relative to the outer ring jig.
To prepare
Cage tester. The first region of the first contact portion that comes into contact with the cage has the same shape as the shape of the region corresponding to the first region of the outer peripheral surface of the rolling element.
The second region of the second contact portion that comes into contact with the cage has the same shape as the region of the outer peripheral surface of the rolling element that corresponds to the second region.
The cage test apparatus according to claim 1. The first fixing portion is fitted into the first groove provided on the inner peripheral surface of the outer ring jig and the second groove provided on the first contact portion, respectively, to form the first fixing portion. 1 It has a first bar member or a first plate member that fixes the contact portion to the inner peripheral surface of the outer ring jig.
The second fixing portion is fitted into a third groove provided on the outer peripheral surface of the inner ring jig and a fourth groove provided in the second contact portion, respectively, to form the second fixing portion. It has a second bar member or a second plate member that fixes the contact portion to the outer peripheral surface of the inner ring jig.
The cage test apparatus according to claim 2. The rolling element is about to rotate around the central axis of the rolling element when it rolls.
The first contact portion has the same length in the central axis direction as the rolling element.
The first fixing portion is a plurality of the first rod members located at intervals of half or more of the length of the first contact portion in the central axial direction, or the central axial direction of the first contact portion. The first plate material, which has a width of at least half the length of the above.
The cage test apparatus according to claim 3. At least one of the first fixing portion and the second fixing portion has the outer ring in a state where at least one of the first contact portion and the second contact portion is tilted from the posture of the rolling element which is normally held. Fix to at least one of the inner peripheral surface of the jig and the outer peripheral surface of the inner ring jig.
The cage test apparatus according to claim 4. A detection unit that detects a load acting on the cage from the drive unit via at least one of the first contact portion and the second contact portion is further provided.
The cage test apparatus according to any one of claims 1 to 5.

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