JP2008032153A - Crown retainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the stirring resistance of a lubricating oil from being increased by a crown retainer without reducing the contact surface of a rolling element on the race of a rolling bearing. <P>SOLUTION: A recessed groove 9 having predetermined widths W1, W2 is formed in the outer peripheral surface 5a of the retainer body part 5 of the crown retainer C1 of a deep groove ball bearing B in the direction axial to the pocket connection line L connecting the inner peripheral edges 11 of the bottom parts 3b of pockets 3. The gap δ1 (recessed groove separate distance) between the groove bottom part 9a of the recessed groove 9 and the shoulder part 2b of the outer ring 2 of the deep groove ball bearing B is larger than the conventional gap δ'. The lubricating oil collided with a ball 4 contained in each pocket 3, flowing to the rear surface R of the deep groove ball bearing B, and flowing into the recessed groove 9 easily flows to the outside of the crown retainer C1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is arranged between the raceway surfaces of the inner and outer rings of a rolling bearing, has a bottom on one side in the axial direction, and maintains a constant spacing between the rolling elements accommodated in each pocket opening on the other side. And it is related with the crown type holder | retainer rotated with each said rolling element.

  The crown type cage is disposed between the inner ring and the outer ring of the rolling bearing and has a function of maintaining a constant interval between the rolling elements accommodated in the pockets. Various patent applications have been filed for the crown type cage (see Patent Document 1).

  As shown in FIG. 6, in the deep groove ball bearing B using the conventional crown type cage C ′, the other bearing ring (outer ring) is fixed to one fixed bearing ring (inner ring 1 or outer ring 2). 2 or inner ring 1) is rotated. At this time, the crown type cage C ′ is also rotated together with the other raceway ring. Lubricating oil (grease or the like) sealed around the crown-shaped cage C is agitated by passing balls 4 attached in a floating state in the respective pockets 3 of the crown-shaped cage C ′.

  The lubricating oil agitated by the balls 4 flows along the outer peripheral surface of the balls 4 (see FIG. 3), and is supplied to the pocket 3 while surplus lubricating oil (lubricating oil that has not been supplied to the pocket 3) is It flows from the side of the ball 4 toward the front side F and the back side R of the deep groove ball bearing B. Here, in the case of a normal deep groove ball bearing B, a large space V is formed on the front side F, whereas on the back side R, the cage body 5 of the crown type cage C is provided. Because of the arrangement, the gap δ ′ between the cage body 5 and the raceway surface (shoulder 2b) of the outer ring 2 is small. As a result, especially on the back side R of the deep groove ball bearing B, the excess lubricating oil stirred by the passage of the balls 4 becomes difficult to flow out, and the stirring resistance of the lubricating oil by the balls 4 increases. This defect becomes more prominent as the rotation of the deep groove ball bearing B becomes faster. Further, since the gap δ ′ is small, there is a problem that the lubricating oil existing around the crown-shaped cage C ′ hardly enters each pocket 3 when the lubricating oil in each pocket 3 is insufficient.

In order to solve this problem, it is assumed that the gap δ ′ is increased by increasing the inner diameter of the outer ring 2. Here, the contact surface between the raceway groove 2a of the outer ring 2 and the ball 4 has an elliptical shape and is referred to as a “contact ellipse S”. When an axial load exceeding the allowable limit is applied to the deep groove ball bearing B, the contact ellipse S rides on the shoulder 2b beyond the raceway groove 2a of the outer ring 2, and the life of the deep groove ball bearing B is shortened. . If the gap δ ′ is increased by increasing the inner diameter of the outer ring 2 by the above-described measures, the contact ellipse S may deviate from the raceway groove 2a, and the life of the deep groove ball bearing B may be shortened.
JP 2000-46058 A

  In view of the above-described problems, an object of the present invention is to prevent an increase in the agitation resistance of lubricating oil by a crown type cage without reducing the contact surface of the rolling elements in the raceway.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, the present invention provides a rolling element which is disposed between raceways of an inner ring and an outer ring of a rolling bearing, and which has a bottom on one side in the axial direction and is accommodated in each pocket opened on the other side. A crown-shaped cage that maintains a constant interval and rotates together with each rolling element, wherein at least one of the outer circumferential surface and the inner circumferential surface of the ring-shaped cage body is used as a reference plane. The reference surface includes a pocket connecting line connecting the inner peripheral edges of the bottoms of the pockets in the circumferential direction of the cage body, and has a predetermined width in the axial direction and a predetermined depth in the radial direction. A ring-shaped concave groove having a thickness is formed, and a radial groove spacing distance in a gap formed between the bottom surface of the concave groove and the raceway surface facing the concave groove is opposed to the reference surface. Formed between the track surface The lubricating oil which is set to be larger than the minimum value of the radial reference surface separation distance in the gap and sealed between the raceway surfaces with the rotation passes through the concave grooves and the cage body portion. It circulates in the axial direction between the back side of the.

  Lubricating oil sealed around the crown type cage of the rolling bearing is agitated by passing the rolling elements of the crown type cage. That is, the lubricating oil that has collided with the rolling element flows along the outer peripheral surface of the rolling element, is supplied to the pocket, and flows laterally. Among these, the lubricating oil that has flowed toward the front side of the rolling bearing flows out as it is through a large space formed on the front side. Further, the lubricating oil that has flowed toward the back side of the rolling bearing flows into a concave groove formed on at least one of the outer peripheral surface and the inner peripheral surface of the cage main body of the crown type cage, and passes through the concave groove. To the outside. Compared with conventional rolling bearings, the radial distance of the gap formed between the bottom surface of the groove and the raceway surface facing the groove is increased by the amount of the groove. Therefore, the lubricating oil easily flows out. Thereby, the increase in the stirring resistance of the lubricating oil by the rolling elements is prevented. Further, when the pocket has insufficient lubricating oil, the lubricating oil stored in the concave groove flows into the pocket, so that poor lubrication is less likely to occur.

  According to a second aspect of the present invention, on the premise of the first aspect of the invention, the concave groove has a predetermined width in the axial direction across the pocket connecting line, and one of the axial directions constituting the concave groove. The inner wall portion on the side is positioned between the back surface of the cage main body portion and the bottom portion of the pocket, and the inner wall portion on the other side is also positioned on the opening side with respect to the bottom portion of the pocket. The groove is characterized in that, on the other side in the axial direction, the bottom of each pocket is connected along the circumferential direction of the cage main body.

  In the invention of claim 2, since the concave groove is formed so as to overlap with the inner peripheral edge of the pocket, the lubricating oil flowing in collision with the rolling element is effectively allowed to flow into the concave groove and flow out to the outside. The lubricating oil in the groove can be effectively flowed into the pocket. That is, the lubricating oil can be circulated in the axial direction without increasing the stirring resistance of the lubricating oil by the rolling elements.

  According to a third aspect of the invention, on the basis of the invention of the second aspect, the reference surface separation distance is equal to or more than the groove separation distance on the back side of the inner wall portion on one side in the axial direction of the groove. It is characterized in that a gap is formed.

  In the invention of claim 3, since the gap larger than the gap of the conventional crown type cage is formed on the back side from the inner wall portion on one side of the groove, the lubricating oil is more easily discharged.

  In another invention, on the premise of the invention of claim 3 described above, the inner wall portion on one side and / or the other side in the axial direction of the groove has a larger opening area than the area of the bottom surface of the groove. It is characterized by being formed obliquely with respect to the pitch circle of the rolling bearing so as to increase.

  In the present invention, since the inner wall portion on one side and / or the other side of the groove is formed obliquely, the lubricating oil can be more easily distributed.

  Further, in a rolling bearing according to another invention, the crown type cage of any of the inventions described above is disposed between the raceway surfaces of the inner ring and the outer ring, and has a bottom portion on one side in the axial direction and opened on the other side. The rolling elements housed in the respective pockets having the same distance between the rolling elements are kept constant and rotate together with the rolling elements.

  In this invention, since the lubricating oil stirred by the rolling element of the crown type cage flows out to the back side thereof, the increase in the stirring resistance of the lubricating oil by the rolling element is prevented, and the life of the rolling bearing is increased. Can do.

  In another aspect of the invention, on the premise of the above-described invention, the raceway surface facing the reference plane is separated from the reference plane in a direction in which the reference plane separation distance is increased, and the axial direction of the concave groove on one side is increased. A gap is formed such that the reference plane separation distance is equal to or greater than the concave groove separation distance on the back side of the inner wall portion.

  In the present invention, since the reference surface separation distance is large, the lubricating oil is more reliably distributed.

  In another invention, on the premise of any one of the above inventions, the raceway surface facing the concave groove expands away from the concave groove in the radial direction toward the back side of the crown type cage. It is characterized by being reduced in diameter or diameter.

  In this invention, the same effect as the above-mentioned invention is produced.

  Further, another invention is characterized in that, on the premise of the above-described invention, the enlarged diameter portion or the reduced diameter portion formed on the raceway surface is formed symmetrically in the axial direction with respect to the pitch circle.

  In this invention, since the enlarged diameter portion or the reduced diameter portion formed on the raceway surfaces of the inner ring and the outer ring are formed symmetrically in the axial direction, there is no distinction between the front side and the rear side of each of the inner ring and the outer ring. Assembling of the rolling bearing is facilitated.

  Examples of the present invention will be described. 1 is a cross-sectional view of the upper half of the rolling bearing B to which the crown type cage C1 of the first embodiment is attached, FIG. 2 is a perspective view of the crown type cage C1, and FIG. It is an enlarged view of a part.

  As shown in FIG. 1, in a rolling bearing (deep groove ball bearing B), the raceway surface (track groove 1a and shoulder 1b) of the inner ring 1 and the raceway surface (track groove 2a and shoulder) of the outer ring 2 mounted coaxially. A crown-shaped cage C is arranged in a portion between 2b) and the radial direction. Rolling elements (balls 4) are accommodated in a plurality of pockets 3 of the crown-shaped cage C (9 in this embodiment, as shown in FIG. 2). The balls 4 are accommodated in the pockets 3 of the crown-shaped cage C1 so as to be able to roll, and their circumferential intervals are kept constant.

  The crown type cage C1 of the first embodiment will be described. The crown type cage C1 is made of a resin material (for example, polyamide resin such as nylon 6 or polyacetal resin). As shown in FIG. 2 and FIG. 3, the ring-shaped cage main body 5 constituting the crown-shaped cage C1 has pockets 3 corresponding to the outer diameters of the balls 4 at a certain angle in the circumferential direction. Formed. In addition, in the end surface portion on the front side of the cage body 5, each partition portion 6 portion (the portion between the pockets 3) has a substantially trapezoidal depression for storing lubricating oil (grease, etc.). Part 7 is formed. A pair of claw portions 8 are formed on both side portions of each partition portion 6 excluding the recessed portion 7. The balls 4 accommodated in the pockets 3 are locked by the pair of claw portions 8 and are held so as not to be detached from the pockets 3.

  One end of each pocket 3 is opened, and a pocket opening 3a is formed. Hereinafter, in the deep groove ball bearing B, the side where the pocket openings 3a of the crown type cage C are provided (the right side in the drawing view of FIG. 1) will be referred to as “front side F”, and the opposite side will be referred to as “rear side”. R ".

  As shown in FIGS. 1 and 2, the outer peripheral surface 5a and the inner peripheral surface 5b of the cage main body 5 in the crown type cage C1 of the first embodiment extend over the entire circumference of the cage main body 5. Recess grooves 9 and 10 are formed. The concave groove 9 will be described in detail. In addition, since the ditch | groove 9 formed in the outer peripheral surface 5a of the retainer main-body part 5 and the ditch | groove 10 similarly formed in the inner peripheral surface 5b are the same structures, here, a retainer main-body part is used. Only the concave groove 9 of the outer peripheral surface 5a of No. 5 will be described. As shown in FIGS. 3 and 4, the concave groove 9 of the crown-shaped cage C1 of the first embodiment has a predetermined width across the pocket connecting line L that connects the inner peripheral edges 11 of the pocket bottom portions 3b of the pockets 3. Width W1, W2. The cross-sectional shape of the concave groove 9 is an inverted trapezoidal shape, and the width W1 of the groove opening is wider than the width W2 of the groove bottom 9a. The inner wall portion 12 a on the back surface side R of the concave groove 9 is disposed on the back surface side R of the pocket connection line L and between the pocket connection line L and the back surface 5 c of the cage body 5. The inner wall portion 12 b on the front side F of the concave groove 9 is disposed on the front side F with respect to the pocket connecting line L so as to overlap the inner peripheral edge 11 of the pocket 3. For this reason, the inner wall portion 12 b on the front side F is divided by the pocket 3. Each inner wall portion 12a, 12b is formed obliquely at a predetermined angle α with respect to the pitch circle 13 (see FIG. 1) of the deep groove ball bearing B formed by connecting the centers of the balls 4.

  As shown in FIG. 4, the portion of the outer ring 2 on the back side R is from the shoulder 2 b connected to the raceway groove 2 a of the outer ring 2 toward the back side R with respect to the radial direction of the deep groove ball bearing B. An outer wall portion 14 that expands in diameter and a stepped portion 15 that is formed to have the same diameter from the end portion of the outer wall portion 14 are formed. Similarly, an outer wall portion 16 and a stepped portion 17 that are reduced in diameter are formed on a portion on the rear side R of the inner ring 1 (see FIG. 1). Since the configurations of the outer wall portions 14 and 16 and the stepped portions 15 and 17 are almost the same, only the stepped portion 15 of the outer ring 2 will be described here. The joint portion between the shoulder 2b of the outer ring 2 and the outer wall portion 14 is disposed almost immediately above the joint portion between the groove bottom portion 9a of the concave groove 9 and the inner wall portion 12a on the back side R in the crown type cage C1. And the inclination | tilt angle (beta) of the outer wall part 14 with respect to the pitch circle 13 (refer FIG. 1) is the same as the inclination | tilt angle (alpha) in the inner wall part 12a of the back side R of the crown type holder | retainer C1. For this reason, the outer wall part 14 of the outer ring | wheel 2 and the inner wall part 12a of the back side R of the crown type holder | retainer C1 are parallel. As a result, a gap δ1 is formed between the groove bottom 9a of the recessed groove 9 and the shoulder 2b of the outer ring 2, and between the inner wall 12a on the back side R of the recessed groove 9 and the outer wall 14 of the outer ring 2. A gap δ2 is formed, and a gap δ3 is formed between the outer peripheral surface 5a of the cage body 5 and the stepped portion 15 of the outer ring 2.

  Each of the gaps δ1 to δ3 described above is larger than the gap δ ′ (see FIG. 8) when the conventional crown type cage C ′ is attached. That is, the radial gap δ1 (groove groove separation distance) from the groove bottom portion 9a of the concave groove 9 to the shoulder portion 2b of the outer ring 2 is determined by using the outer peripheral surface 5a of the cage main body portion 5 of the crown type cage C1 as a reference surface. The clearance δ ′ (reference surface separation distance) in the radial direction from the outer peripheral surface 5a to the shoulder 2b of the outer ring 2 is larger. For this reason, the lubricating oil that has collided with the ball 4 and has flowed to the rear side R easily flows out of the crown-shaped cage C1 through the concave groove 9. In addition, since the concave groove 9 is formed so as to overlap with the inner peripheral edge 11 of the pocket 3, sufficient gaps δ1 to δ3 can be formed even if the depth of the concave groove 9 and the step of the stepped portion 15 are not increased so much. It can be secured. For this reason, there is no possibility of reducing the strength of the crown type cage C1 and the outer ring 2. Further, the outer wall portion 14 and the stepped portion 15 of the outer ring 2 are formed with the shoulder portion 2 b remaining on the inner peripheral surface of the outer ring 2. For this reason, even if a load acts in the axial direction of the deep groove ball bearing B, there is no possibility that the contact ellipse S deviates from the raceway groove 2 a of the outer ring 2.

  The operation of the crown type cage C1 of the present embodiment will be described. 2 and 3, as the deep groove ball bearing B rotates in the rotation direction Q, the crown type cage C1 also rotates in the same direction. At this time, as shown in FIG. 3, the ball 4 accommodated in the pocket 3 of the crown-shaped cage C1 and the lubricating oil sealed in the crown-shaped cage C1 collide. At this time, the lubricating oil flows on the outer peripheral surface of the ball 4 and is supplied to the pocket 3. Then, surplus lubricating oil (lubricating oil that has not been supplied to the pocket 3) flows while being distributed left and right along the outer peripheral surface of the ball 4. In FIG. 3, the flow of the lubricating oil at that time is indicated by an arrow. The lubricating oil that has flowed to the front side F (the right side in the drawing view of FIG. 3) of the deep groove ball bearing B flows out of the crown type cage C1 through the space V (see FIG. 1). Since the large space V is formed on the front side F of the deep groove ball bearing B, the lubricating oil is easily discharged and the stirring resistance by the balls 4 does not increase.

  On the other hand, the lubricating oil that has flowed to the rear side R of the deep groove ball bearing B flows into the concave groove 9. The pocket bottom 3b of the pocket 3 of the concave groove 9 is formed so as to overlap, and the gap δ of the conventional crown type cage C ′ is formed between the groove bottom 9a of the concave groove 9 and the shoulder 2b of the outer ring 2. Since a larger gap δ1 than 'is formed, the lubricating oil easily flows into the concave groove 9. The lubricating oil that has flowed through the groove 9 is the gap δ2 between the inner wall 12a on the back side R of the groove 9 and the outer wall 14 of the outer ring 2, and the outer peripheral surface of the cage main body 5 of the crown type cage C1. It flows out of the crown-shaped cage C through a gap δ3 between 5a and the stepped portion 15b of the outer ring 2. Since the inner wall portion 12a on the rear side R of the concave groove 9 and the outer wall portion 14 of the outer ring 2 are formed obliquely at predetermined angles α and β, the lubricating oil flows out more easily. As described above, excess lubricating oil smoothly flows out of the crown-shaped cage C through the concave groove 9, so that the agitation resistance of the lubricating oil by the balls 4 is prevented from increasing.

  When the lubricating oil in the pocket 3 of the crown type cage C1 decreases, the lubricating oil stored in the concave groove 9 flows into the pocket 3. Since the concave groove 9 is formed so as to overlap the inner peripheral edge 11 of the pocket 3, the lubricating oil can easily flow into the pocket 3. Thereby, poor lubrication of the crown type cage C1 is prevented.

  The above-described operation is the same even when the crown type cage C rotates in the direction opposite to the rotation direction Q.

  In the deep groove ball bearing B to which the crown type cage C1 of the first embodiment is attached, the outer wall portions 14 and 16 and the stepped portions 15 and 17 of the inner ring 1 and the outer ring 2 are only on the back side R of the deep groove ball bearing B. However, it is also formed on the front side F in the same manner (symmetrically in the axial direction with respect to the pitch circle 13 of the deep groove ball bearing B) (see FIG. 1). Thereby, the distinction between the front side F and the back side R of each of the inner ring 1 and the outer ring 2 becomes unnecessary, and the assembly of the deep groove ball bearing B is facilitated.

  In addition, it is more effective to form the concave groove 9 in the outer peripheral surface 5a than in the inner peripheral surface 5b of the cage main body 5 of the crown type cage C1 due to the action of centrifugal force accompanying the rotation of the crown type cage C1. In addition, it is more effective to form the outer wall portion 14 and the stepped portion 15 in the outer ring 2 than in the inner ring 1.

  As shown in FIGS. 5A and 5B, the crown type cage C2 of the second embodiment has a pocket connecting line L in contact with the inner peripheral edge 11 of the pocket bottom 3b in the pocket 3, and a deep groove. This is a case where the groove 18 is formed on the back side R of the ball bearing B. Even in the crown type cage C2 of this embodiment, the lubricating oil that collided with the ball 4 and flowed to the back side R flows into the concave groove 18 and flows out of the crown type cage C2. An increase in the agitation resistance of the lubricating oil by the balls 4 is prevented, and poor lubrication is prevented.

  As shown in FIGS. 6A and 6B, the crown type cage C3 of the third embodiment has a pocket connecting line L in contact with the inner peripheral edge 11 of the pocket bottom 3b in the pocket 3, and a deep groove. This is a case where the concave groove 19 is formed on the front side F of the ball bearing B. Even in the crown type cage C3 of this embodiment, the lubricating oil that collided with the ball 4 and flowed to the back side R flows into the concave groove 18 and flows out of the crown type cage C2. An increase in the agitation resistance of the lubricating oil by the balls 4 is prevented, and poor lubrication is prevented.

  As shown in FIGS. 7A and 7B, the groove 20 of the crown type cage C4 of the fourth embodiment is a groove bottom portion 19a of the groove 19 in the crown type cage C3 of the third embodiment. However, it is a case where it is extended to the back surface 5c of the cage main body 5 and has a stepped shape. The crown type cage C4 of this embodiment has an advantage that a sufficient gap δ4 is ensured without processing the shoulder portion 2b of the outer ring 2.

It is sectional drawing of the upper half part of the rolling bearing B to which the crown type holder | retainer C1 of 1st Example was attached. It is a perspective view of the crown type cage C1. It is an enlarged view of the principal part of the crown type holder C1. FIG. 4 is an enlarged sectional view taken along line XX in FIG. 3. (A) is sectional drawing of the upper half part of the rolling bearing B with which the crown type holder | retainer C2 of 2nd Example was mounted | worn, (b) is a top view of the crown type holder C2. (A) is sectional drawing of the upper half part of the rolling bearing B with which the crown type holder | retainer C3 of 3rd Example was mounted | worn, (b) is a top view of the crown type holder C3. (A) is sectional drawing of the upper half part of the rolling bearing B with which the crown type holder | retainer C4 of 4th Example was mounted | worn, (b) is a top view of the crown type holder C4. It is sectional drawing of the upper half part of the deep groove ball bearing B with which the conventional crown type holder | retainer C 'was attached.

Explanation of symbols

B: Deep groove ball bearing (rolling bearing)
C1-C4: Crown type cage
F: Front side
L: Pocket connection line
Q: Direction of rotation
R: Back side
W1, W2: Width
δ1, δ4: Gap (concave groove separation distance)
δ3: Clearance (reference plane separation distance)
δ ′: Clearance (minimum reference plane separation distance)
1: Inner ring
1a: Track groove (track surface)
1b: Shoulder (track surface)
2: Outer ring
2a: Track groove (track surface)
2b: shoulder (track surface)
3: Pocket
3a: Pocket opening (opening)
3b: Pocket bottom (bottom)
4: Ball (rolling element)
5: Cage body
5a: outer peripheral surface
5b: Inner peripheral surface
5c: Back side 9, 10, 18-20: Groove
11: Inner edge
9a: groove bottom (bottom of groove)
12a, 12b: inner wall
13: Pitch circle
14: Outer wall part (expanded part)
16: Outer wall part (reduced diameter part)

Claims (3)

It is arranged between the raceway surfaces of the inner ring and the outer ring of the rolling bearing, has a bottom on one side in the axial direction, and maintains a constant spacing between the rolling elements accommodated in each pocket opened on the other side, A crown-shaped cage that rotates with each rolling element,
At least one of the outer peripheral surface and inner peripheral surface of the ring-shaped cage main body is used as a reference surface, and the inner peripheral edge of the bottom of each pocket is connected to the reference surface in the circumferential direction of the cage main body. A ring-shaped concave groove having a predetermined width in the axial direction and a predetermined depth in the radial direction is formed in a form including the pocket connecting line.
The radial groove spacing distance in the gap formed between the bottom surface portion of the groove and the raceway surface facing it is the radial direction in the gap formed between the reference surface and the raceway surface facing it. Is set to be larger than the minimum value of the reference plane separation distance,
The crown-shaped holding, wherein the lubricating oil sealed between the raceway surfaces with the rotation flows in the axial direction between the pocket side and the back side of the cage main body through the concave groove. vessel. The concave groove has a predetermined width in the axial direction across the pocket connecting line,
The inner wall portion on one side in the axial direction constituting the concave groove is located between the back surface of the cage main body portion and the bottom portion of the pocket, and the inner wall portion on the other side is also more than the bottom portion of the pocket. By being located on the opening side,
The crown-shaped cage according to claim 1, wherein the concave groove connects the bottom of each pocket along the circumferential direction of the cage main body on the other side in the axial direction.   The clearance gap in which the said reference plane separation distance is equal to or more than the said groove separation distance is formed in the back side rather than the inner wall part of the axial direction one side in the said groove. The crown type cage described in 1.

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