WO2016152407A1 - Rolling bearing - Google Patents

Abstract

A bearing is provided with an inner ring, an outer ring which is disposed on the outer peripheral side of the inner ring, a plurality of balls (3) which are arranged between the inner ring and the outer ring, and a retainer (7). In the retainer (7), joint sections (11a, 11b) where the joint plate sections of a first annular member (1a) and the joint plate sections of a second annular member (1b) are connected are formed to form pocket sections (12) where the pocket wall sections of the first annular member (1a) and the pocket wall sections of the second annular member (1b) face each other to retain the balls (3), and the plurality of pocket sections (12) and the plurality of joint sections (11a, 11b) are arranged alternately circumferentially. When viewed in the direction passing through the centers (O1) of the balls (3), the joint sections (11a, 11b) of the retainer (7) are arranged at positions offset from the center in the axial direction intersecting the circumferential direction.

Description

Rolling bearing

This invention relates to a rolling bearing, and more particularly to a rolling bearing having a cage.

Conventionally, as a rolling bearing, as a cage for holding a rolling element, a pair of annular members formed by assembling the rolling element and having a cage having a pocket for holding the rolling element inside Is known (see, for example, JP 2013-142450 A).

JP 2013-142450 A

In such a cage, when the pair of annular members are assembled so as to sandwich the rolling elements, the positions of the pair of annular members may be displaced from each other, thereby causing a shift in the pocket. When such a pocket shift occurs, for example, at the joint portion between the coupling portion adjacent to the pocket and a pair of annular members and the pocket, the rolling element and the joint portion are caused by the positional deviation of the annular member. There is a possibility that the contact state with the roller becomes uneven, and as a result, wear of the cage is promoted. Further, in the above-described conventional cage, the coupling portion is located in the circumferential direction when viewed from the center of the rolling elements held in the pockets, and is located at a substantially central portion in the axial direction. In this case, if the rolling element moves in the circumferential direction during use of the bearing, the rolling element is more likely to come into contact with the joint between the coupling portion and the pocket. Also from this point, the cage may be worn due to the contact between the rolling elements and the cage. Further, when the joint is positioned at substantially the center in the axial direction, both of the pair of annular members and the rolling element come into contact with each other at the joint, and the contact portion with the rolling element in the cage (that is, the place where wear occurs). There may be more than one.

¡When such cage wear occurs, wear powder is generated due to the wear. When such wear powder is mixed into the lubricating oil in the bearing, the lubrication state inside the bearing deteriorates. As a result, there has been a problem that the life of the lubricating oil is shortened.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rolling bearing capable of suppressing the shortening of the life of the lubricating oil.

The rolling bearing according to the present embodiment includes an inner ring, an outer ring disposed on the outer peripheral side of the inner ring, a plurality of balls disposed between the inner ring and the outer ring, and a cage. The cage has first and second annular members and holds each of the plurality of balls. Each of the first and second annular members includes an arcuate pocket wall portion having a guide surface facing the ball, and a coupling extending from the end of the pocket wall portion in the circumferential direction of each of the first and second annular members. The plate portion has a shape provided alternately in the circumferential direction. In the cage, by forming a coupling portion in which the coupling plate portion of the first annular member and the coupling plate portion of the second annular member are connected, the pocket wall portion of the first annular member and the second annular member are formed. A pocket portion for holding the ball is formed facing the pocket wall portion of the annular member, and the plurality of pocket portions and the plurality of coupling portions are alternately provided in the circumferential direction. The coupling portion of the cage is disposed at a position shifted from the central portion in the axial direction intersecting the circumferential direction when viewed from the center of the ball.

According to the above, it is possible to provide a rolling bearing capable of suppressing the shortening of the lubricating oil life by suppressing the wear of the cage.

It is a cross-sectional schematic diagram which shows the structure of the rolling bearing which concerns on embodiment of this invention. It is a cross-sectional schematic diagram for demonstrating the structure of the cage of the rolling bearing shown in FIG. It is an expansion schematic diagram for demonstrating the individuality of the holder | retainer shown in FIG. It is an expansion schematic diagram for demonstrating the modification of the rolling bearing which concerns on embodiment of this invention. It is an expansion schematic diagram for demonstrating the modification of the rolling bearing which concerns on embodiment of this invention. It is an expansion schematic diagram for demonstrating the modification of the rolling bearing which concerns on embodiment of this invention. It is the schematic which shows partially the structure of the trolley | bogie to which the rolling bearing which concerns on embodiment of this invention is applied. It is the schematic which shows the structure of the main motor in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

<Bearing configuration>
With reference to FIG. 1, the structure of the rolling bearing 10 which concerns on embodiment of this invention is demonstrated.

The rolling bearing 10 according to the embodiment mainly includes an inner ring 5, an outer ring 4, a plurality of balls 3, and a cage 7. The outer ring 4 is disposed on the outer peripheral side of the inner ring 5 in the radial direction indicated by the arrow R. The plurality of balls 3 are arranged between the inner ring 5 and the outer ring 4. The cage 7 is disposed on the outer peripheral side of the inner ring 5 and on the inner peripheral side of the outer ring 4. Each of the outer ring 4 and the inner ring 5 has an annular shape. A shaft 6 can be fitted inside the inner ring 5. The inner ring 5 can rotate together with the shaft 6. The shaft 6 is located at the center O2 of the inner ring 5.

2 and 3, retainer 7 includes an annular body 1 including a first annular member 1a and a second annular member 1b, a first annular member 1a, and a second annular member 1b. And a rivet (not shown) as a fixing member for connecting the two. 2 is a schematic diagram of the cage 7 as seen from the direction along the arrow 15 in FIG. The first annular member 1a includes a first guide surface 1a1, a first contact surface 1a2, and a first outer surface 1a3. Similarly, the second annular member 1b includes a second guide surface 1b1, a second contact surface 1b2, and a second outer surface 1b3.

The first annular member 1a is disposed so as to face the second annular member 1b. Specifically, the first contact surface 1a2 is in contact with the second contact surface 1b2. Flat portions where the first contact surface 1a2 and the second contact surface 1b2 are in contact are the first coupling portion 11a and the second coupling portion 11b. The first guide surface 1a1 faces the second guide surface 1b1 in a state of being separated from the second guide surface 1b1. A space surrounded by the first guide surface 1 a 1 and the second guide surface 1 b 1 is a pocket 9 for holding the ball 3. The pocket portion 12 in which the pocket 9 is formed is disposed between the first coupling portion 11a and the second coupling portion 11b. From a different point of view, the first coupling portion 11a is disposed on one side in the circumferential direction indicated by the arrow P when viewed from the center O1 of the ball held in the pocket 9 of the pocket portion 12, and the second coupling portion 11b is disposed on the other side. Is connected.

As shown in FIG. 2, the first coupling portion 11 a and the second coupling portion 11 b pass through a central portion in the axial direction of the bearing 10 (direction indicated by an arrow A in FIG. 1), and a centerline 2 ( It is arranged at a position shifted from the center line 2) extending in the circumferential direction through the center O1 of the ball in the pocket 9. Further, from a different point of view, the first coupling portion 11a and the second coupling portion 11b are arranged on opposite sides as viewed from the center line 2.

From the circumferential tangent line through the ball center O1 in the pocket 9 (tangent line overlapping the center line 2 in FIG. 3) to the region where the angle θ1 from the center O1 is 5 ° or more, the first coupling part 11a or the second coupling part The connection part of 11b and the pocket part 12 is arrange | positioned. From a different point of view, a straight line passing through the connecting portion between the first connecting portion 11a or the second connecting portion 11b and the pocket portion 12 and the center O1 of the ball 3, and a circumferential tangent passing through the center O1 of the ball 3 The angle θ1 formed by the center line 2 is 5 ° or more. Here, the connection portion between the first coupling portion 11a or the second coupling portion 11b and the pocket portion 12 is the first contact surface 1a2 and the second contact surface 1b2 in the first coupling portion 11a or the second coupling portion 11b. Means the position of the end of the contact surface facing the inner peripheral side of the pocket portion 12. The angle θ1 may be 10 ° or more, 15 ° or more, or 20 ° or more.

A through-hole penetrating the first annular member 1a and the second annular member 1b may be formed in the first coupling portion 11a and the second coupling portion 11b. The first annular member 1a and the second annular member 1b may be fixed by inserting a rivet as a fixing member into the through hole and overtightening at least one end of the rivet.

The holder 7 is configured to hold each of the plurality of balls 3. As shown in FIG. 1, each of the plurality of balls 3 is disposed in each of a plurality of pockets 9 (see FIG. 2). That is, one ball 3 is arranged in one pocket 9. The pocket 9 includes a first guide surface 1a1 and a second guide surface 1b1. In other words, the pocket 9 is constituted by the first guide surface 1a1 and the second guide surface 1b1. The first guide surface 1 a 1 and the second guide surface 1 b 1 face the ball 3. The ball 3 is surrounded by the first guide surface 1a1 and the second guide surface 1b1. For example, lubricating grease is provided between each of the first guide surface 1 a 1 and the second guide surface 1 b 1 and the ball 3. As shown in FIG. 2, the cage 7 is formed with a plurality of pockets 9 including the first guide surface 1a1 and the second guide surface 1b1 along the circumferential direction. For example, eight pockets 9 may be provided along the circumferential direction of the cage 7 at intervals of 45 °. The number of pockets 9 may be a number other than eight.

<Operational effect of bearing>
In this way, the region in which the ball 3 is likely to contact the inner peripheral surface of the pocket portion 12 in the circumferential direction (regions 1a4, 1b4 where the angle from the center line 2 is less than the angle θ1 when viewed from the center O1). ), The connection portion is not arranged, so that the possibility that the ball 3 contacts the connection portion can be reduced. For this reason, generation | occurrence | production of the abrasion powder by abrasion of the holder | retainer 7 can be suppressed because both the 1st annular member 1a and the 2nd annular member 1b and the ball | bowl 3 contact in a connection part.

<Variation of bearing>
A modification of the rolling bearing 10 described above will be described with reference to FIGS.

The rolling bearing 10 having the cage shown in FIG. 4 has basically the same configuration as the rolling bearing shown in FIGS. 1 to 3, but the configuration of the pocket portion 12 of the cage is shown in FIGS. It differs from the rolling bearing 10 shown. In the rolling bearing shown in FIG. 4, flat portions 1a5 and 1b5 having flat surfaces are formed in a region where the angle from the center line 2 when viewed from the center O1 is less than the angle θ1 in the pocket portion 12 of the cage. Has been.

Therefore, the rolling bearing shown in FIG. 4 can obtain the same effect as the rolling bearing shown in FIGS. 1 to 3, and the periphery of the pocket portion 12 which is a region where the balls 3 are likely to contact. By forming the flat portions 1a5 and 1b5 on the inner peripheral surface located in the direction, the ball 3 can be brought into point contact with the flat portions 1a5 and 1b5. For this reason, the wear of the cage can be reduced more than when the balls 3 are in contact with the cage at a plurality of locations. Further, for such flat portions 1a5 and 1b5, for example, when the first annular member and the second annular member constituting the cage are manufactured by press molding or the like, it is easy to mold a mold used for the press molding. In some cases, the manufacturing cost can be reduced.

The rolling bearing 10 having the cage shown in FIG. 5 has basically the same configuration as the rolling bearing shown in FIGS. 1 to 3, but the configuration of the cage is the rolling bearing shown in FIGS. 10 and different. In the rolling bearing shown in FIG. 5, the coupling portion 11 c that connects the plurality of pocket portions 12 in the cage extends obliquely with respect to the circumferential direction so as to intersect the center line 2. The connecting portion between the coupling portion 11c and the pocket portion 12 is disposed at a position shifted from the central portion in the axial direction in the pocket portion 12, as in the case of the rolling bearing 10 shown in FIGS. .

Therefore, the rolling bearing shown in FIG. 5 can obtain the same effect as the rolling bearing shown in FIGS. 1 to 3, and the shapes of the coupling portions 11c arranged in the circumferential direction are substantially the same. Can do. For this reason, generation | occurrence | production of the problem that the lubrication state in a rolling bearing changes locally in the circumferential direction can be suppressed.

In addition, although the direction where the coupling | bond part 11c cross | intersects the centerline 2 is good also as shown in FIG. 5, it is good also as a different direction for every some coupling | bond part 11c. Moreover, you may change the said crossing direction alternately about the coupling | bond part 11c arranged in a circumferential direction.

The rolling bearing 10 having the cage shown in FIG. 6 basically has the same configuration as the rolling bearing shown in FIGS. 1 to 3, but the configuration of the cage is the rolling bearing shown in FIGS. 10 and different. In the rolling bearing shown in FIG. 6, the first coupling portion 11a or the second coupling portion 11b that connects the plurality of pocket portions 12 in the cage is arranged on the same side with respect to the center line 2 or Two second coupling portions 11b are arranged in succession.

Therefore, the rolling bearing shown in FIG. 6 can achieve the same effects as the rolling bearing shown in FIGS. In FIG. 6, two first coupling portions 11a or second coupling portions 11b are continuously arranged, but three or more may be continuously arranged.

<Dolly equipped with main motor including bearing according to this embodiment>
Next, the structure of the cart of this embodiment provided with the main motor using the rolling bearing mentioned above is demonstrated, referring FIG. A cart 100 of the present embodiment is a cart provided in a railway vehicle, and includes a cart body 102, a main motor 110, a coupling 130, a drive device 140, an axle 150, wheels 160, and an axle bearing device. 170 mainly. Main motor 110 is the main motor of the railway vehicle of the present embodiment.

The main motor 110 is supported by the main body 102 of the main motor mounting portion 102a. In addition, the main shaft 120 of the main motor 110 is connected to the drive device 140 via the coupling 130. The driving device 140 has a small gear 141 fixed to the main shaft 120 and a large gear 142 fixed to the axle 150, and the small gear 141 and the large gear 142 are arranged to mesh with each other. A pair of wheels 160 are fixed to the axle 150, and both ends thereof are supported by the axle body 102 by an axle bearing device 170. The axle bearing device 170 is supported by the carriage main body 102 in the carriage 102b.

Next, the operation of the wheel 160 by the main motor 110 of the railway vehicle according to the present embodiment will be described. With reference to FIG. 7, first, main shaft 120 rotates as main electric motor 110 operates. At this time, the rotation of the main shaft 120 is transmitted to the driving device 140 via the coupling 130, and the small gear 141 fixed to the main shaft 120 rotates. The rotation of the small gear 141 causes the large gear 142 that meshes with the small gear 141 to rotate. Further, when the axle 150 fixed to the large gear 142 rotates, the wheels 160 fixed to both ends of the axle 150 rotate, and the carriage 100 travels. The operation of the main motor 110 will be described later.

<Main motor>
Next, the configuration of the main motor 110 of the railway vehicle according to the present embodiment will be described. Referring to FIG. 8, main motor 110 is disposed so as to surround stator 112 having coil 112 a, rotor 113 disposed to face stator 112, and stator 112 and rotor 113. The frame 111 is mainly provided. The main shaft 120 is fixed so as to penetrate through a portion including the central portion (rotating shaft) of the rotor 113. Further, the main motor 110 is arranged around the axis with respect to the housing 183 as the first fixing member and the housing 188 as the second fixing member, which are disposed so that the main shaft 120 of the main motor 110 faces the outer peripheral surface 120a of the main shaft 120. A first bearing device 180 and a second bearing device 181 are further provided as a support structure for the main motor spindle of the present embodiment that is rotatably supported.

Next, the operation of the main motor 110 of the present embodiment will be described. Referring to FIG. 8, first, a three-phase alternating current is supplied to coil 112 a of stator 112. At this time, a rotating magnetic field is formed around the rotor 113, and an induced current is generated in the rotor 113 by the rotating magnetic field. As described above, a rotating magnetic field is formed around the rotor 113 and an induced current is generated in the rotor 113, thereby generating an electromagnetic force that works to rotate the rotor 113 around the rotation axis. 113 rotates. Then, the rotation of the rotor 113 is extracted to the outside through the main shaft 120.

<Main motor spindle support structure>
Next, the support structure for the main motor spindle of the present embodiment will be described. Referring to FIG. 8, the main motor main shaft support structure of the present embodiment includes a first bearing device 180 that supports a fixed side of main shaft 120 with respect to housing 183, and a free side of main shaft 120 with respect to housing 188. And a second bearing device 181 that supports the second bearing device 181. The first bearing device 180 includes a first bearing 182, a housing 183, a stopper, an end lid, and an oil draining member. The first bearing 182 has the same configuration as the rolling bearing 10 shown in FIGS. 1 to 3, and includes an outer ring, an inner ring, a rolling element, and a cage. The first bearing 182 is sandwiched between the stopper and the oil draining member. The inner peripheral surface of the inner ring is fixed to the outer peripheral surface of the main shaft 120. Further, the outer peripheral surface of the outer ring is fixed to the housing 183.

The second bearing device 181 includes a second bearing 186, a housing 188, a stopper, an oil draining member, and an end lid. The second bearing 186 has the same configuration as the roller bearing 10 shown in FIGS. 1 to 3, and includes an outer ring, an inner ring, a rolling element, and a cage.

The second bearing 186 is sandwiched between a stopper, an oil draining member, and an end lid, and the inner peripheral surface of the inner ring is fixed to the outer peripheral surface of the main shaft 120. A grease pocket is formed in the housing 188 at a portion facing the rolling element of the second bearing 186. Also, the end cover is formed with a grease pocket at a portion facing the rolling element of the second bearing 186. Grease is sealed inside the grease pocket.

The durability of the main motor can be improved by applying the rolling bearing 10 according to the present embodiment to such a main motor.

Although there are portions that partially overlap with the above description, the characteristic configurations of the embodiment of the present invention are listed.

The rolling bearing 10 according to the present embodiment includes an inner ring 5, an outer ring 4 disposed on the outer peripheral side of the inner ring 5, a plurality of balls 3 disposed between the inner ring 5 and the outer ring 4, and a cage 7. Prepare. The cage 7 has first and second annular members 1 a and 1 b and holds each of the plurality of balls 3. Each of the first and second annular members 1a, 1b includes an arcuate pocket wall portion having a guide surface facing the ball 3, and the first and second annular members 1a, 1b from the end of the pocket wall portion. Each of the coupling plate portions extending in the circumferential direction has a shape provided alternately in the circumferential direction. In the cage 7, the first annular member is formed by forming coupling portions 11 a, 11 b, and 11 c in which the coupling plate portion of the first annular member 1 a and the coupling plate portion of the second annular member 1 b are connected. The pocket wall portion 1a and the pocket wall portion of the second annular member 1b face each other to form a pocket portion 12 for holding the ball 3, and a plurality of pocket portions 12 and a plurality of coupling portions 11a, 11b, 11c, Are alternately provided in the circumferential direction. The coupling portions 11a, 11b, and 11c of the cage 7 are arranged at positions shifted from the central portion in the axial direction intersecting the circumferential direction when viewed from the center O1 of the ball 3.

In this case, the connection part (the connection part between the connection part 11a, 11b, 11c and the pocket wall part) of the joint part 11a, 11b, 11c and the pocket part 12 of the cage 7 is viewed from the center O1 of the ball 3. It arrange | positions in the position shifted | deviated from the center part in the axial direction in the circumferential direction side. That is, in the inner circumferential surface of the pocket portion 12, a region in the circumferential direction viewed from the center O <b> 1 of the ball 3, and the region where the ball 3 is likely to come into contact with the circumferential movement of the ball 3 is the first. Only the guide surface of the annular member 1a or the guide surface of the second annular member 1b is configured. In this case, one point on the surface of the ball 3 makes point contact with the guide surface. On the other hand, when the said connection part is located in the center part in the axial direction in the internal peripheral surface of the pocket part 12, possibility that the ball | bowl 3 will contact the said connection part becomes high. In such a connection portion, the guide surface of the first annular member 1a and the guide surface of the second annular member 1b are arranged so as to be bent to the adjacent coupling portion (via the bent portion). . For this reason, when the ball 3 comes into contact with the connecting portion, the ball 3 comes into contact with each of the bent portion of the guide surface of the first annular member 1a and the bent portion of the guide surface of the second annular member 1b. there is a possibility. In this case, since the balls 3 are in contact with the cage 7 at two locations, wear powder from the cage 7 is more likely to be generated than when the balls 3 are in contact with the guide surface of the cage 7 at one point. For this reason, in the rolling bearing 10 which concerns on this embodiment mentioned above, since the ball | bowl 3 can be made to contact the guide surface in the circumferential direction of the pocket part 12 of the holder | retainer 7 at one point, generation | occurrence | production of abrasion powder can be suppressed. Therefore, the shortening of the lubrication life caused by the wear powder mixed into the lubricating oil can be suppressed.

In the rolling bearing 10, a straight line that passes through the connecting portion of the coupling portions 11 a, 11 b, 11 c and the pocket portion 12 and the center O 1 of the ball 3, and a tangential line in the circumferential direction that passes through the center O 1 of the ball 3 The angle θ1 formed by the tangent line may be 5 ° or more. In this case, the connecting portion is not arranged in a region where the angle θ1 with the circumferential tangent is less than 5 °, which is a region where the balls 3 are likely to contact in the circumferential direction of the pocket portion 12. For this reason, since the said area | region is comprised by either the guide surface of the 1st cyclic | annular member 1a, or the guide surface of the 2nd cyclic | annular member 1b, when the surface of the ball | bowl 3 contacts with respect to the said area | region, the said area | region The ball 3 can be brought into contact with one point. For this reason, generation | occurrence | production of abrasion powder can be suppressed rather than the case where the ball | bowl 3 contacts with the holder | retainer 7 in several places of a connection part. The angle θ1 may be 10 ° or more, 15 ° or more, or 20 ° or more.

In the rolling bearing 10, in the cage 7, a pair of coupling portions (a first coupling portion 11 a and a second coupling portion 11 b in FIG. 2) that are adjacent to each other via one pocket portion 12 in the circumferential direction among the plurality of coupling portions. ) May be arranged at positions shifted in the opposite direction from the central portion in the axial direction as shown in FIG. 2 when viewed from the center O1 of the ball 3 held in the one pocket portion 12.

In this case, since the plurality of coupling portions 11a and 11b arranged in the circumferential direction of the cage 7 are arranged at positions shifted in the reverse direction from the center in the axial direction, the arrangement of the coupling portions 11a and 11b is arranged in the axial direction of the bearing. It can be prevented from being biased to one side as viewed from the center. For this reason, it is possible to suppress the occurrence of the problem that the flow conditions of the lubricating oil in the bearing differ in the axial direction when the rolling bearing 10 is used due to the uneven arrangement of the coupling portions 11a and 11b.

In the rolling bearing 10, as shown in FIG. 6, in the cage 7, one set of coupling portions 11 a adjacent to each other via one pocket portion 12 in the circumferential direction among the plurality of coupling portions 11 a and 11 b is the 1 As viewed from the center O1 of the balls 3 held in the two pocket portions 12, they may be arranged at positions shifted in the same direction from the central portion (center line 2) in the axial direction.

In this case, the flow conditions of the lubricating oil in the bearing can be adjusted in the axial direction of the bearing by biasing the arrangement of the coupling portions 11a and 11b to one side as viewed from the central portion in the axial direction of the rolling bearing 10. it can. For example, when it is desired to improve the lubrication condition particularly on one side of the rolling bearing 10 viewed from the central part in the axial direction depending on the use conditions of the rolling bearing 10, the other side of the coupling parts 11a and 11b viewed from the central part in the axial direction. Can be arranged.

In the rolling bearing 10, the guide surface facing the ball 3 in the pocket portion 12 includes flat portions 1 a 5 and 1 b 5 at a portion located in the circumferential direction when viewed from the center O 1 of the ball 3 as shown in FIG. Also good. In this case, since the part with high possibility that the ball 3 will contact can be made into the flat parts 1a5 and 1b5, the ball 3 can be reliably brought into point contact with the part. For this reason, generation | occurrence | production of the abrasion powder from the holder | retainer 7 resulting from the ball 3 contacting the several places of the holder | retainer 7 can be suppressed.

Although the embodiments of the present invention have been described above, the above-described embodiments can be variously modified. The scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

This embodiment is particularly advantageously applied to a bearing in which balls are held by a cage.

1a 1st annular member, 1a1 1st guide surface, 1a2 1st contact surface, 1a3 1st outer surface, 1a4, 1b4 region, 1a5, 1b5 flat part, 1b 2nd annular member, 1b1 2nd guide surface, 1b2 2nd contact surface, 1b3, 2nd outer surface, 2 center line, 3 ball, 4 outer ring, 5 inner ring, 6 shaft, 7 cage, 9 pocket, 10 rolling bearing, 11a 1st coupling part, 11b 2nd coupling part, 11c coupling part, 12 pocket part, 15, A, P, R arrow, O1, O2 center, 100 carriage, 102 carriage body, 102a main motor mounting part, 102b base frame, 110 main motor, 111 frame, 112 stator, 112a coil, 113 rotor, 120 spindle, 120a outer peripheral surface, 130 coupling, 140 driving device, 141 small gear 142 large gear, 150 an axle, 160 wheels, 170 axle bearing apparatus, 180 a first bearing unit, 181 second bearing unit, 182 first bearing, 183,188 housing, 186 second bearing.

Claims (5)

Inner ring,
An outer ring disposed on the outer peripheral side of the inner ring;
A plurality of balls disposed between the inner ring and the outer ring;
A cage having first and second annular members and holding each of the plurality of balls;
Each of the first and second annular members includes an arcuate pocket wall portion having a guide surface facing the ball, and a periphery of each of the first and second annular members from an end portion of the pocket wall portion. And a connecting plate portion extending in the direction has a shape provided alternately in the circumferential direction,
In the cage, the pocket of the first annular member is formed by forming a coupling portion in which the coupling plate portion of the first annular member and the coupling plate portion of the second annular member are connected. A wall portion and the pocket wall portion of the second annular member are opposed to each other to form a pocket portion for holding the ball, and the plurality of pocket portions and the plurality of coupling portions are alternately arranged in the circumferential direction. Provided,
The rolling bearing, wherein the coupling portion of the cage is disposed at a position shifted from a central portion in an axial direction intersecting the circumferential direction when viewed from the center of the ball. The angle formed by a straight line passing through the connecting portion between the coupling portion and the pocket portion and the center of the ball and a circumferential tangent passing through the center of the ball is 5 ° or more. Rolling bearing. In the retainer, a pair of the coupling portions adjacent to each other through one pocket portion in the circumferential direction among the plurality of coupling portions is viewed from the center of the ball held in one pocket portion. The rolling bearing according to claim 1, wherein the rolling bearing is disposed at a position shifted in the opposite direction from the central portion in the axial direction. In the retainer, a pair of the coupling portions adjacent to each other through one pocket portion in the circumferential direction among the plurality of coupling portions is viewed from the center of the ball held in one pocket portion. The rolling bearing according to claim 1, wherein the rolling bearing is disposed at a position shifted in the same direction from the central portion in the axial direction. The rolling bearing according to any one of claims 1 to 4, wherein the guide surface facing the ball in the pocket portion includes a flat portion at a portion located in the circumferential direction when viewed from the center of the ball.

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