JP6327005B2 - Rolling bearing axial clearance measuring device and measuring method - Google Patents

Description

  The present invention relates to a measuring apparatus and a measuring method for measuring an axial clearance of a large-sized and thin-walled rolling bearing used in a rolling bearing, particularly a CT scanner device.

  As a rolling bearing, there is a double-row angular contact ball bearing in which one of the outer ring and the inner ring is divided into two at the axial center (see, for example, Patent Document 1). This double row angular contact ball bearing is a large-sized rolling bearing used in a CT scanner device. In FIG. 6, the principal part enlarged view in the axial cross section of the double row angular contact ball bearing 10 is shown. The double-row angular ball bearing 10 includes an outer ring 1 having two rows of outer raceways 1a and 1b on the inner periphery, and an inner ring having two rows of inner raceways 21 and 31 facing the outer raceways 1a and 1b on the outer circumference. 2 and 3 are provided coaxially, and a plurality of balls 4, 4 held by cages 5, 5 are interposed between the outer raceway surfaces 1 a, 1 b and the inner raceway surfaces 21, 31.

  Generally, when the clearance formed between the raceway surface and the ball is too large in the assembled state, the rolling bearing deteriorates in rotation accuracy or generates noise during rotation. On the other hand, when the clearance is too small, that is, when the preload is excessively applied between the raceway surface and the ball, the rotational torque increases and the temperature rises abnormally or the service life decreases. It becomes a problem. Therefore, it is necessary to accurately measure the axial clearance in the double row angular contact ball bearing described above in order to confirm whether or not an appropriate axial clearance is provided.

  When measuring the axial clearance of a double row angular contact ball bearing, it is obtained from the axial displacement of the other when the outer ring or inner ring is fixed and the other is moved in the axial direction. Large rolling bearings are large and difficult to handle, so dedicated precision measuring devices are rarely used, and they are often measured with a simple measuring device while left on a surface plate. .

As mentioned above, when measuring on the surface plate, insert a rectangular parallelepiped block between the inner and outer rings and the surface plate at several places in the circumferential direction (generally three places) The axial displacement of the inner ring relative to the outer ring is measured. Specifically, measurement is performed in the following steps.
First step: Place block A on the surface plate and place the inner ring on it. The outer ring is in a floating state.
Second step: Lift the outer ring. At the same time, the inner ring is lifted. Jacks and insulators are used to lift the outer ring.
Third step: The block B (the height of the block B is higher than the height of the block A) is arranged below the outer ring, and the outer ring is placed on the block B. The inner ring is in a floating state.
Fourth step: An axial clearance is obtained by calculating the amount of change in the axial position of the inner ring relative to the outer ring in the first step and the third step.

JP 2012-67852 A

  Some large rolling bearings with a diameter of about 1 m have a weight exceeding 100 kg. For this reason, since it is difficult to lift the entire rolling bearing, in the second step, only one place on the circumference of the outer ring is lifted, the block B is arranged at the lifted place, and the outer ring is placed. This operation is sequentially performed in the circumferential direction. Thus, when the work of placing the outer ring on the block B is completed on the entire circumference in the circumferential direction, the third step is completed.

Here, when the first part on the circumference of the outer ring is lifted, the inner ring is supported by the block A on the opposite side in the radial direction. In large rolling bearings, the inner and outer rings are made thinner than the diameter, so if they are supported on both sides in the radial direction, the outer and inner rings are bent by their own weight on the unsupported circumference. Deform.
The size of the axial clearance to be measured is about 0.1 mm. On the other hand, the amount of deflection described above may reach a maximum of several millimeters at the location where the displacement is the largest. When such a deflection occurs, the portions supporting the rolling bearing are pulled toward each other in the radial direction. Therefore, when the outer ring is placed on the block B in the third step, the rolling bearing is in a perfect circle state. Cannot be maintained. For this reason, there has been a problem that accurate axial clearance measurement becomes difficult.

  In view of such circumstances, an object of the present invention is to accurately measure an axial clearance using a measuring device with a simple configuration, particularly for a large and thin rolling bearing.

  One form of an axial clearance measuring device for a rolling bearing according to the present invention includes an outer ring having an outer raceway surface on the inner periphery, and an inner ring having an inner raceway surface disposed coaxially with the outer ring and facing the outer raceway surface on the outer periphery. And an axial clearance measuring device for a rolling bearing having a plurality of rolling elements arranged so as to be freely rollable between the outer raceway surface and the inner raceway surface, mounted on a reference table, With the support member for supporting the inner ring substantially horizontally and the leg portions installed at a plurality of positions, the support member is mounted substantially horizontally with respect to the reference table and supports the outer ring. A movable member that is displaced in a substantially vertical direction according to a length; and a measuring unit that measures a relative displacement in the axial direction between the inner ring and the outer ring, and the movable member extends along the outer ring. At least one piece that is continuous in the circumferential direction. The outer ring is displaced while supporting over the entire circumference.

  Another embodiment of the axial clearance measuring device for a rolling bearing according to the present invention has an outer ring having an outer raceway surface on the inner circumference, and an inner raceway surface arranged coaxially with the outer ring and facing the outer raceway surface on the outer circumference. An axial clearance measuring device for a rolling bearing having an inner ring, and a plurality of rolling elements arranged so as to be freely rollable between the outer raceway surface and the inner raceway surface, mounted on a reference table, With the support member supporting the outer ring substantially horizontally and the leg portions installed at a plurality of locations, the leg portion is mounted substantially horizontally with respect to the reference base and supports the inner ring. A movable member that is displaced in a substantially vertical direction in accordance with the length of the inner ring, and a measuring unit that measures a relative displacement in the axial direction between the inner ring and the outer ring, and the movable member extends along the inner ring. Are at least one piece continuous in the circumferential direction, The serial inner ring is displaced while supporting over the entire circumference.

  One form of the axial clearance measuring method for a rolling bearing according to the present invention is an axial clearance measuring method for a rolling bearing using the above-described form of the axial clearance measuring apparatus for a rolling bearing, wherein the inner ring is mounted on the support member. A first step of measuring a vertical height X1 of the inner ring with respect to the outer ring in a state where the outer ring is not in contact with the movable member, and the movable member is changed in a substantially vertical direction by changing the length of the leg portion. A second step of displacing the outer ring in a substantially vertical direction until the entire outer ring is placed on the movable member and the inner ring is separated from the support member. A third step of measuring the vertical height X2 of the inner ring with respect to the outer ring in a state of being separated from the support member, and the difference ΔX between the height X1 and the height X2 A fourth step of obtaining a Le gap consists.

  Another embodiment of the axial clearance measuring method for a rolling bearing according to the present invention is an axial clearance measuring method for a rolling bearing using the other embodiment of the axial clearance measuring device for a rolling bearing, wherein the outer ring is mounted on the support member. A first step of measuring a vertical height X1 of the outer ring with respect to the inner ring in a state where the inner ring is not in contact with the movable member, and changing the length of the leg portion to make the movable member substantially vertical. A second step of displacing the inner ring in a substantially vertical direction until the entire inner ring is placed on the movable member and the outer ring is separated from the support member. In the state where the outer ring is separated from the support member, the third step of measuring the vertical height X2 of the outer ring with respect to the inner ring, and the difference ΔX between the height X1 and the height X2 A fourth step of obtaining a catcher Le gap consists.

  According to the present invention, it is possible to accurately measure the axial clearance using a measuring device having a simple configuration, particularly for a large and thin rolling bearing.

It is a figure explaining the structure of the apparatus which measures the axial clearance gap of this invention. It is a figure explaining the procedure which measures the axial clearance of this invention. It is a perspective view of the movable base used for the axial clearance measuring apparatus of this invention. It is a front view of a movable base. It is sectional drawing of the axial direction of a movable base in AA of FIG. It is a principal part enlarged view of the axial cross section explaining the structure of a rolling bearing.

With reference to FIG. 6, the structure of the double-row angular contact ball bearing 10 which is an object for measuring the axial clearance will be described in detail. A double-row angular ball bearing 10 (hereinafter simply referred to as “bearing”) is a rolling element that is inserted between the outer ring 1, the pair of inner rings 2, 3, and the outer ring 1 and each of the inner rings 2, 3 so as to roll freely. And a plurality of balls 4 and 4 and cages 5 and 5 that arrange the balls 4 and 4 at equal intervals in the circumferential direction.
This bearing 10 is a bearing incorporated in a CT scanner device or the like. The outer diameter of the bearing 10 is approximately 1200 mm, the inner diameter is 1000 mm, and the width is approximately 60 mm. The cross-sectional area of the outer ring 1 and the inner rings 2 and 3 in the axial direction is smaller than the diameter. For this reason, the bearing ring of the bearing 10 is easily deformed by its own weight when it is lifted or supported only at one place on the circumference.

  The outer ring 1 is made of bearing steel. Two rows of outer raceway surfaces 1a and 1b are formed on the inner periphery. The shape of the outer raceway surfaces 1 a and 1 b in the axial cross section is an arc, and its radius of curvature is slightly larger than the radius of the ball 4. The ball 4 and the outer raceway surfaces 1a and 1b are in contact with each other in a direction inclined at a predetermined angle with respect to the radial direction (this angle is referred to as “contact angle”). The directions of the contact angles of the two rows of outer raceways 1a and 1b are opposite to each other. End faces 6a and 6b, which are surfaces orthogonal to the rotation axis, are formed at both ends of the outer ring 1 in the axial direction.

The inner rings 2 and 3 are made of bearing steel. Since the inner rings 2 and 3 have the same shape, only one of them will be described. A row of inner raceway surfaces 21 (31) are formed on the outer periphery of the inner ring 2 (3). The shape of the inner raceway surface 21 (31) in the axial section is an arc, and its radius of curvature is slightly larger than the radius of the ball 4. The ball 4 and the inner raceway surface 21 (31) are in contact with each other with a predetermined contact angle.
A cylindrical shoulder 22 (32) having an outer diameter dimension substantially equal to the minimum diameter of the inner raceway surface 21 (31) may be formed on one side in the axial direction of the inner raceway surface 21 (31). The shoulder 22 (32) is connected to the small end face 24 (34). A shoulder 23 (33) having a diameter larger than that of the shoulder 22 (32) is formed on the other side in the axial direction of the inner raceway surface 21 (31). The shoulder 23 (33) is connected to the large end face 25 (35). The small end face 24 (34) and the large end face 25 (35) are parallel to each other and are perpendicular to the axis.

The axial clearance of the bearing 10 will be described.
In the bearing 10, the inner rings 2 and 3 are assembled from both sides of the outer ring 1 in the axial direction so that the small end surfaces 24 and 34 face each other. At this time, a predetermined number of balls 4 and 4 are arranged between the outer raceway surfaces 1a and 1b and the inner raceway surfaces 21 and 31, respectively. The outer raceway surfaces 1a and 1b and the inner raceway surfaces 21 and 31 face each other in the direction of the contact angle with the ball 4 interposed therebetween.
The dimensions of each part of the bearing 10 are such that a clearance of a predetermined size S is formed between the small end surfaces 24 and 34 in a state where the balls 4 are in contact with the outer raceway surfaces 1a and 1b and the inner raceway surfaces 21 and 31. It is made with. When the bearing 10 is incorporated into a CT scanner device or the like, the small end surfaces 24 and 34 are brought into contact with each other, and a preload is applied to the balls 4. The axial clearance at this time is “negative axial clearance” (the magnitude is minus S).

Next, the configuration of the measuring apparatus 7 according to the first embodiment of the present invention will be described with reference to FIG. The axial clearance is measured by placing the bearing 10 on the surface plate 50 in a direction in which the rotation axis is in the vertical direction.
The measuring device 7 includes a surface plate 50 serving as a reference base, a plurality of inner blocks 70 (support members) for supporting the inner rings 2 and 3 in the vertical direction, and a movable base 80 for supporting the outer ring 1 in the vertical direction. (Movable member) and a dial gauge 60 which is a measuring means.

  The surface plate 50 is a base made of a casting, and the upper surface is machined flat to form a reference surface 51. The size of the reference surface 51 is large enough to allow the entire bearing 10 to be placed on the reference surface 51 when the bearing 10 is placed.

The detailed shape of the movable base 80 will be described with reference to FIGS. 3 is a perspective view of the movable base 80, FIG. 4 is a front view thereof, and FIG. 5 is a sectional view in the axial direction thereof.
The movable base 80 is made of a steel material and is formed in a substantially annular shape with a flat plate having a certain thickness. The outer circumference and the inner circumference are substantially concentric with each other. In the following description, a line that passes through the center of the circle and is perpendicular to the flat plate is referred to as an “axis”, a direction parallel to the “axis” is referred to as an “axial direction”, and a direction perpendicular to the “axis” is referred to as a “radial direction” That's it.

  As shown in FIG. 3, an outer ring support surface 81 on which the outer ring 1 is placed is formed on one side of the movable base 80 in the axial direction. A base end surface 82 is formed on the opposite side of the outer ring support surface 81 and on the other side in the axial direction. On the outer periphery of the movable base 80, leg portions 83 protruding outward in the radial direction are provided at three locations at equal intervals in the circumferential direction.

  The outer ring support surface 81 is machined in a flat shape, and several foreign matter discharge grooves 84 are formed in the radial direction on the surface. The inner diameter of the inner peripheral surface 8 of the outer ring support surface 81 is larger than the outer diameter of the large end surface 25 of the inner ring 2 and smaller than the inner diameter of the end surface 6 a of the outer ring 1. Since the outer diameter of the outer ring support surface 81 is larger than the outer diameter of the outer ring 1, the outer ring support surface 81 can support the end surface 6 a of the outer ring 1 over the entire circumference.

  As shown in FIGS. 4 and 5, the base end surface 82 is machined to be finished in a plane parallel to the outer ring support surface 81. The base end face 82 is formed with a thinned portion 85 intermittently in the circumferential direction. Thus, since the movable base 80 has a structure in which one side in the axial direction connects the outer peripheral wall 86 and the inner peripheral wall 87 with the rib 88, the weight of the movable base 80 can be reduced while ensuring the rigidity of the movable base 80.

  A leg 89 that can expand and contract in a direction perpendicular to the base end surface 82 is incorporated in the leg 83. The movable base 80 is placed on the reference surface 51 with the outer ring support surface 81 positioned vertically upward. The movable base 80 is supported by three legs 89, and the movable base 80 can be moved up and down in the vertical direction by extending and contracting the legs 89.

  Since the structure of the leg portion 83 is not an essential configuration of the present embodiment, a detailed description of the structure is omitted, but the following structure can be used. For example, there is a structure in which a female screw is processed in the leg portion 83 and a male screw is formed in the leg 89 to be screwed into the female screw. The leg 89 can be expanded and contracted by rotating the male screw.

  In addition, the structure which inserts the block of various height between the movable base 80 and the surface plate 50, and changes the height of the vertical direction of the movable base 80 with respect to the surface plate 50 is also equivalent to said leg part 83. FIG. Shall.

The rigidity of the movable base 80 will be described. Rigidity is represented by the amount of axial deflection that occurs in the unsupported portion between the support points when both ends of the movable base 80 in the radial direction are supported. The rigidity of the movable base 80 in this embodiment is such that, when a load having a size equivalent to the weight of the bearing 10 is applied to the unsupported portion, the amount of bending that occurs in the unsupported portion is 10 μm or less. It is about the size. On the other hand, the size of the axial clearance is 100 μm or more.
Therefore, since the rigidity of the movable base 80 is sufficiently large, the bending of the movable base 80 has little influence on the measurement of the axial clearance.

  In this way, the movable base 80 is formed as an integrated body that is continuous in the circumferential direction along the outer ring 1, and has rigidity capable of withstanding the weight of the outer ring 1.

Returning again to FIG. Three inner blocks 70 are disposed on the inner peripheral side of the movable base 80 in order to place the inner ring 2 of the bearing 10. The inner blocks 70 are arranged at substantially equal intervals in the circumferential direction along the inner peripheral surface 90 at a position slightly spaced radially inward from the inner peripheral surface 90 of the movable base 80.
The inner block 70 is made of a steel material, and its shape is a rectangular parallelepiped having a size of about 5 cm in length, width, and height. The height H1 of the upper surface when placed on the surface plate 50 is slightly larger than the height H2 of the outer ring support surface 81 of the movable base 80. Moreover, the dimension H1 of each inner block 70 is mutually equal.

  Although not shown in the figure for the dial gauge 60 as the measuring means, a rod 61 that contacts the object to be measured and expands and contracts according to the displacement of the object, and a display unit that displays the amount of expansion and contraction of the rod 61 are provided. Have.

Next, a method for measuring the axial clearance using the measuring device 7 will be described with reference to FIGS.
Since a preload is applied to the bearing 10, the spacer 9 having a known thickness is inserted between the small end surfaces 24 and 34 of the inner rings 2 and 3 in advance and measurement is performed with a positive clearance. The thickness Z of the spacer 9 is suitably about 1 mm. The spacer 9 is made of carbon steel, and is hardened and hardened so as to have a hardness of about 50 HRC. In the case where the axial clearance is the correct clearance and there is a clearance between the raceway surface and the ball in a state where the small end surfaces 24 and 34 of the inner rings 2 and 3 are in contact with each other, The spacer 9 is not necessary.

As a first step, the bearing 10 is placed from above in the vertical direction of the movable base 80 so as to be substantially coaxial with the inner peripheral surface 90 of the movable base 80 (see FIG. 1). At this time, since the height H1 of the inner block 70 is larger than the height H2 of the movable base 80, the large end surface 25 of the inner ring 2 is supported by the inner block 70.
Since the end face 6a of the outer ring 1 is in a floating state, the outer ring 1 is displaced to one side in the axial direction (downward in the vertical direction) with respect to the inner rings 2 and 3 by its own weight, and the lower side of the double row In the ball array, the outer ring 1 is held in a state where the balls 4 are in contact with the outer raceway surface 1 a and the inner raceway surface 21.

In measuring the axial clearance, when it is necessary to apply a predetermined axial load as a measurement condition, a weight 65 is placed on the end face 6 b of the outer ring 1.
Since there is friction at the contact portions between the balls 4 and the respective raceway surfaces, the outer ring 1 is connected to the inner rings 2 and 3 before starting the measurement of the axial clearance in order to stabilize the axial position of the outer ring 1. It is desirable to rotate several times around.

  Thus, the outer ring 1 is combined with the inner rings 2 and 3 in a state of being most biased in one of the axial directions.

  In order to measure the axial displacement of the outer ring 1 with respect to the inner rings 2 and 3, a dial gauge 60 is installed on the end surface 6 b of the outer ring 1 using a magnet stand or the like, and the rod 61 is brought into contact with the large end surface 35 of the inner ring 3. Make contact. The axial clearance is measured using the scale X1 of the dial gauge 60 at this time as a reference value.

As a second step, the leg 89 is extended in the axial direction at one leg 83a (first leg) among the three legs 83 (see FIG. 2).
In the movable base 80, the position of the first leg portion 83a moves upward in the vertical direction (hereinafter simply referred to as “upward”) with the second leg portion 83b and the third leg portion 83c as fulcrums. At this time, since the entire movable base 80 moves upward as a unit, the outer ring support surface 81 abuts the end surface 6a of the outer ring 1 over the entire circumference, and the entire circumference of the outer ring 1 is placed on the outer ring support surface 81. Move upward in state.

When the outer ring 1 is displaced upward, the outer raceway surface 1b and the inner raceway surface 31 come into contact with each other with the ball 4 in the upper row of the double row. Thus, at the same time as the outer ring 1 is displaced upward, the inner rings 2 and 3 are displaced upward, and the inner rings 2 and 3 are lifted from the inner block 70.
As a result, the entire weight of the bearing 10 including the inner rings 2 and 3 and the outer ring 1 is supported by the movable base 80. In this embodiment, since the movable base 80 has sufficient rigidity, even when the weight of the bearing 10 is loaded, the bending of the movable base 80 is suppressed to a small value. In this state, it fixes so that the leg of a 1st leg part may not expand-contract.

Next, in the second leg portion 83b, the leg 89 is extended in the axial direction. Since this process is the same as the first leg, the illustration is omitted.
In the movable base 80, the position of the second leg portion 83b moves upward with the first leg portion 83a and the third leg portion 83c as fulcrums. Thereby, the outer ring | wheel 1 mounted in the movable base 80 moves further upwards. In this state, it fixes so that the leg of a 2nd leg part may not expand-contract.

Next, in the third leg portion 83c, the leg 89 is extended in the axial direction. In the movable base 80, the position of the third leg 83c moves upward with the first leg 83a and the second leg 83b as fulcrums. In this state, it fixes so that the leg of a 3rd leg part may not expand-contract.
Thus, the outer ring 1 is supported by the movable base 80 in a state where it is lifted parallel to the position of the first step.

  Since the large end surface 25 of the inner ring 2 is lifted from the inner block 70, the inner rings 2 and 3 are displaced to one of the axial directions (downward in the vertical direction) by their own weight. As a result, the inner ring 3 is held in a state where the balls 4 are in contact with the outer raceway surface 1b and the inner raceway surface 31 in the upper row of balls in the double row.

  An axial load as a measurement condition of the axial clearance is loaded by a weight 66 placed on the large end surface 35 of the inner ring 3. As in the case of the outer ring 1, it is desirable to rotate the inner rings 2 and 3 several times with respect to the outer ring 1 in order to stabilize the axial positions of the inner rings 2 and 3.

Thus, the inner rings 2 and 3 are combined with the outer ring 1 in a state of being most biased in one of the axial directions. That is, the axial position of the outer ring 1 with respect to the inner rings 2 and 3 is combined in a state where it is most biased to the other side (upward in the vertical direction) opposite to the first step.
In this state, the scale X2 of the dial gauge 60 installed in the first step is read, and the axial displacement ΔX of the outer ring 1 relative to the inner rings 2 and 3 is obtained. Considering the thickness Z of the spacer 9 inserted in advance, the axial clearance S can be obtained by S = Z−ΔX.

In the conventional method, since the outer ring is not supported integrally in the circumferential direction, when a part of the outer ring 1 on the circumference is lifted in the second step, it is between the other support portions on the opposite side in the radial direction. The bearing 10 was bent vertically downward by its own weight.
This bending deteriorates the roundness of the raceways of the inner rings 2, 3 and the outer race 1, so that in the third step, the balls 4, the inner raceway surface 31 and the outer raceway surface 1b are correctly aligned in the direction of the contact angle. There was no contact.

In the present embodiment, the outer ring 1 is placed on a movable base 80 formed as a single continuous body in the circumferential direction through each step of measuring the axial clearance. And since this movable base 80 has the rigidity which can bear the weight of the bearing 10, it can prevent that the bearing 10 deform | transforms with dead weight.
Thus, in the measuring device 7 of the present embodiment, the axial clearance can be accurately measured by preventing the deformation of the bearing ring, particularly in the large and thin bearing 10.

  In the present embodiment, the axial displacement of the outer ring 1 is measured with reference to the inner rings 2 and 3 placed on the inner block 70 in order to obtain the axial clearance. Similarly, the outer ring 1 may be placed on the surface plate 50 and the axial displacement amount of the inner rings 2 and 3 with respect to the outer ring 1 may be measured.

  In the present embodiment, the procedure for individually operating the leg portions 83 that support the movable base 80 has been described, but the present invention is not limited to this. For example, by supporting the leg 89 of each leg 83 with a ball screw and controlling the rotation of the shaft with a pulse motor, the three legs 83 can be operated simultaneously. By operating the three leg portions 83 simultaneously, the outer ring 1 can be displaced coaxially with respect to the inner rings 2 and 3. As a result, the axial clearance can be measured more accurately.

1: outer ring, 1a, 1b: outer raceway surface, 2, 3: inner ring, 4: ball, 5: cage, 6a, 6b: end face, 7: measuring device, 10: double row angular contact ball bearing, 21, 31: Inner raceway surface, 22, 32: shoulder, 24, 34: small end surface, 23, 33: shoulder, 25, 35: large end surface, 50: surface plate, 51: reference surface, 60: dial gauge, 65.66: heavy Weight: 70: Inner block (support member), 80: Movable base (movable member), 81: Outer ring support surface, 82: Base end surface, 84: Foreign matter discharge groove, 90: Inner peripheral surface, 85: Vented portion, 88 : Rib, 89: Leg

Claims (5)

An outer ring having an outer raceway surface on the inner periphery;
An inner ring disposed coaxially with the outer ring and having an inner raceway surface facing the outer raceway surface on the outer periphery;
A plurality of rolling elements arranged to be freely rollable between the outer raceway surface and the inner raceway surface;
An axial clearance measuring device for a rolling bearing having
A support member mounted on a reference table and supporting the inner ring substantially horizontally;
It is mounted substantially horizontally with respect to the reference table via legs installed at a plurality of locations, and is displaced in a substantially vertical direction according to the length of the legs while supporting the outer ring. A movable member;
Measuring means for measuring a relative displacement in the axial direction between the inner ring and the outer ring,
An apparatus for measuring an axial clearance of a rolling bearing, wherein the movable member is an integral member that is continuous at least in the circumferential direction along the outer ring, and is displaced in a state where the outer ring is supported over the entire circumference. An outer ring having an outer raceway surface on the inner periphery;
An inner ring disposed coaxially with the outer ring and having an inner raceway surface facing the outer raceway surface on the outer periphery;
A plurality of rolling elements arranged to be freely rollable between the outer raceway surface and the inner raceway surface;
An axial clearance measuring device for a rolling bearing having
A support member mounted on a reference table and supporting the outer ring substantially horizontally;
It is mounted substantially horizontally with respect to the reference table via legs installed at a plurality of locations, and is displaced in a substantially vertical direction according to the length of the legs while supporting the inner ring. A movable member;
Measuring means for measuring a relative displacement in the axial direction between the inner ring and the outer ring,
An apparatus for measuring an axial clearance of a rolling bearing, wherein the movable member is an integral member that is continuous at least in the circumferential direction along the inner ring, and is displaced while the inner ring is supported over the entire circumference. A method for measuring an axial clearance of a rolling bearing using the axial clearance measuring device for a rolling bearing according to claim 1, comprising:
A first step of placing the inner ring on the support member and measuring a vertical height X1 of the inner ring with respect to the outer ring in a state where the outer ring is not in contact with the movable member;
By displacing the movable member in a substantially vertical direction by changing the length of the leg, until the entire outer ring is placed on the movable member and the inner ring is separated from the support member, A second step of displacing the outer ring in a substantially vertical direction;
A third step of measuring a vertical height X2 of the inner ring with respect to the outer ring in a state where the inner ring is separated from the support member;
A fourth step for obtaining an axial clearance from the difference ΔX between the height X1 and the height X2,
Axial clearance measurement method for rolling bearings consisting of A method for measuring an axial clearance of a rolling bearing using the axial clearance measuring device for a rolling bearing according to claim 2,
A first step of placing the outer ring on the support member and measuring a vertical height X1 of the outer ring with respect to the inner ring in a state where the inner ring is not in contact with the movable member;
By displacing the movable member in a substantially vertical direction by changing the length of the leg, until the entire inner ring is placed on the movable member and the outer ring is separated from the support member, A second step of displacing the inner ring in a substantially vertical direction;
A third step of measuring a vertical height X2 of the outer ring with respect to the inner ring in a state where the outer ring is separated from the support member;
A fourth step for obtaining an axial clearance from the difference ΔX between the height X1 and the height X2,
Axial clearance measurement method for rolling bearings consisting of The said 2nd step displaces the said movable member to a perpendicular direction in the state parallel to the said supporting member by changing the said leg part by the same length simultaneously, The 3rd or Claim characterized by the above-mentioned. Item 5. Axial clearance measurement method for rolling bearings according to item 4.

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