JP2017198298A - Crown type holder and ball bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce agitation resistance by a resin-based crown type holder rotating in a ball bearing.SOLUTION: On each of an inner peripheral surface and outer peripheral surface of a crown type holder 4, provided are a central oil groove 9 extending in a circumferential direction, and a plurality of V-shaped oil grooves 10 extending into a V shape projecting toward one side of the circumferential direction. The central oil groove 9 passes through an axial central part on the inner peripheral surface or outer peripheral surface of the crown type holder 4. The V-shaped oil groove 10 crosses the central oil groove at its V-shaped width central part. The crown type holder is used in a ball bearing with a bearing rotation direction limited only to one side of the circumferential direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin crown-shaped cage and a ball bearing including the same.

  In general, the ball bearing includes a cage that accommodates the ball in a pocket. In particular, the resin-made crown-type cage has a greater degree of freedom in shape design than that made of steel, and can realize low torque (low friction, low wear) and light weight. For this reason, when the low torque property of bearing rotational torque is regarded as important, a ball bearing provided with a resin crown type cage is used.

  Lubricants such as lubricating oil and grease exist inside the ball bearing. During the operation of the ball bearing, the ball and the crown type cage agitate the lubricant and receive resistance at this time. The stirring resistance causes bearing rotation torque and heat generation.

  Conventionally, a large number of grooves extending in the circumferential direction are formed on the inner and outer peripheral surfaces of the crown type cage, and the flow of the lubricant is rectified by these grooves, thereby reducing the stirring resistance and reducing the bearing rotational torque. In addition, suppression of heat generation is performed (Patent Document 1).

JP 2003-232362 A

  However, when the lubricant is rectified by the circumferential grooves on the inner and outer peripheral surfaces of the crown type cage, the rectified lubricant stays in the vicinity of the crown type cage inside the bearing, which is also stirred. Therefore, there is a problem that the effect of reducing the bearing rotational torque is weak.

  In view of the above-described background, the problem to be solved by the present invention is to further reduce the stirring resistance by a resin crown-shaped cage that rotates in a ball bearing.

  In order to achieve the above object, the present invention provides a crown-shaped cage made of resin in which pockets penetrating between the inner circumferential surface and the outer circumferential surface are formed at predetermined intervals in the circumferential direction, and balls are accommodated in the pockets. One or more locations are provided on each of the inner peripheral surface and the outer peripheral surface, a central oil groove extending in the circumferential direction, and a plurality of V grooves that are provided in each of the inner peripheral surface and the outer peripheral surface and pointed toward one circumferential direction. A V-shaped oil groove extending in a letter shape, the central oil groove passes through an axially central portion of the inner peripheral surface or the outer peripheral surface, and the V-shaped oil groove is adjacent in the circumferential direction. A configuration was adopted in which it was passed through a portion between matching pockets and used for a ball bearing in which the bearing rotation direction was limited to only one circumferential direction.

  According to the above configuration, the crown-shaped cage rotates only in one circumferential direction during operation of the ball bearing. Lubricant enters the central and V-shaped oil grooves on the inner and outer peripheral surfaces of the rotating crown type cage. The lubricant that has entered relatively flows to the other circumferential side opposite to the cage rotation direction. Since the lubricant flows through the central oil groove, the flow of the lubricant is rectified, so that the stirring resistance is reduced. Further, the lubricant that has entered the V-shaped oil groove flows in the direction in which the V-shaped oil groove extends in the V-shaped oil groove in the direction opposite to the cage rotation direction. Since the V-shaped oil groove passes through the part between adjacent pockets in the circumferential direction, the lubricant flowing through the V-shaped oil groove can be held smoothly without crossing the inner and outer circumferential surfaces of the crown-shaped cage. It is discharged to the side of the inner and outer peripheral surfaces of the vessel. Since the lubricant discharged from the V-shaped oil groove diffuses to both sides of the crown-type cage with a momentum, it is difficult to stay near the crown-type cage inside the bearing. This also reduces the stirring resistance. As described above, the flow of the lubricant is rectified in the vicinity of the axially central portion of the inner peripheral surface and the outer peripheral surface of the crown type cage during the rotation of the bearing, thereby reducing the stirring resistance and the lubricant in the bearing. By preventing staying in the vicinity of the inner crown-shaped cage, the stirring resistance is further reduced.

  Therefore, in the present invention, the stirring resistance can be further reduced by the resin-made crown cage that rotates in the ball bearing, and consequently, the rotational torque of the ball bearing can be reduced and the heat generation can be suppressed. .

The perspective view which shows the external appearance of the crown type holder | retainer which concerns on the Example of this invention Sectional drawing which shows the ball bearing which concerns on the Example of this invention Side view of the crown type cage of FIG. Front view of the crown type cage of FIG. The partial front view which shows typically the mode of the flow of the center oil groove and V-shape oil groove of the crown type retainer of FIG. (A) is a partial cross-sectional view showing the cross-sectional shape of the V-shaped oil groove in FIG. 1, (b) is a partial cross-sectional view showing a modification of the cross-sectional shape of the V-shaped oil groove Sectional drawing which shows an example of a transmission provided with the ball bearing which concerns on this invention

  Various embodiments of the invention will be described.

According to a first embodiment of the present invention, in the crown-type cage according to the present invention, the V-shaped oil groove gradually increases from the axially opposite ends of the inner peripheral surface or the outer peripheral surface toward the circumferential one. The central oil groove intersects the central oil groove at the axially central portion of the inner peripheral surface or the outer peripheral surface, and the central oil groove intersects two or more V-shaped oil grooves. is there.
According to the first embodiment, the lubricant flowing through the central oil groove branches one after another to both sides of each intersecting V-shaped oil groove, and from each V-shaped oil groove, the inner peripheral surface and outer peripheral surface of the crown type cage Since it is discharged to both sides, it is possible to promote the discharge of the lubricant that resists the ball.

According to a second embodiment of the present invention, in the crown type cage according to the present invention, the cross-sectional shape of the V-shaped oil groove is U-shaped or V-shaped.
When the cross-sectional shape of the V-shaped oil groove is U-shaped or V-shaped, the lubricant easily flows through the V-shaped oil groove quickly. For this reason, according to the second embodiment, foreign matter is less likely to stay in the V-shaped oil groove, and the lubricant is easily discharged smoothly.

  According to a third embodiment of the present invention, in the crown type cage according to the present invention, a polyamide resin, a polyether ether ketone resin, or a polyphenylene sulfide resin is used as the resin.

  4th Embodiment of this invention is comprised by the ball bearing provided with the crown type holder | retainer which concerns on this invention.

  According to a fifth embodiment of the present invention, in the ball bearing according to the fourth embodiment, a rotating portion provided in a transmission is supported.

A ball bearing and a crown cage according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the ball bearing according to the embodiment includes an inner ring 1, an outer ring 2, a plurality of balls 3, a crown type cage 4, and a seal 5.

  Here, the central axis of the inner ring 1, the central axis of the outer ring 2, and the central axis of the crown type cage 4 are set coaxially. Hereinafter, the “axial direction” means the direction along the central axis of the crown type cage, the “radial direction” means the direction perpendicular to the axial direction, and the “circumferential direction” means The circumferential direction around the central axis.

  The inner ring 1 is made of an annular member and has a raceway groove 6 on the outer periphery thereof. The outer ring 2 is made of an annular member and has a raceway groove 7 on the inner periphery thereof. The ball 3 is interposed between the raceway groove 6 of the inner ring 1 and the raceway groove 7 of the outer ring 2. The circumferential interval between the balls 3 is maintained by the crown-shaped cage 4. An annular bearing internal space formed between the inner ring 1 and the outer ring 2 is sealed by a pair of seals 5.

  As shown in FIGS. 1, 3, and 4, pockets 8 are formed in the crown type retainer 4 at predetermined intervals in the circumferential direction. The pocket 8 refers to an opening for receiving the ball 3. One ball 3 is accommodated in each pocket 8. Each pocket 8 penetrates between the inner peripheral surface and the outer peripheral surface of the crown-shaped cage 4 and opens on one side surface in the axial direction of the crown-shaped cage 4. The crown-shaped cage 4 includes an annular portion provided only on the other side opposite to one in the axial direction, and a plurality of pairs of claw portions protruding from the annular portion only on one side in the axial direction. The crown type cage 4 can be axially combined with the single row of balls 3 interposed between the raceway groove 6 of the inner ring 1 and the raceway groove 7 of the outer ring 2 by elastic deformation of each claw portion. ing. The inner surface of the pocket 8 is exemplified by a shape along a single spherical surface slightly larger than the ball diameter of the ball 3, but may be changed to another inner surface shape.

  The crown type cage 4 is a rolling element guide type cage guided by the balls 3.

  The inner peripheral surface of the crown-shaped cage 4 is a surface exposed in the radial direction inside the crown-shaped cage 4. The inner peripheral surface of the crown type cage 4 faces the inner ring 1 in the radial direction. The outer peripheral surface of the crown-shaped cage 4 is a surface exposed in the radial direction outside the crown-shaped cage 4. The outer peripheral surface of the crown type cage 4 faces the outer ring 2 in the radial direction. The inner peripheral surface and the outer peripheral surface of the crown type cage 4 are in the bearing inner space and come into contact with the lubricant.

  The crown type retainer 4 includes a central oil groove 9 provided at one or more locations on each of the inner peripheral surface and the outer peripheral surface, and a plurality of V-type oil grooves 10 provided on each of the inner peripheral surface and the outer peripheral surface, And parallel oil grooves 11 provided on each of the inner peripheral surface and the outer peripheral surface. The central oil groove 9, the V-shaped oil groove 10, and the parallel oil groove 11 provided on the inner peripheral surface of the crown-shaped cage 4 are respectively in the radial direction from the inner peripheral surface portion that defines the inner diameter dimension of the crown-shaped cage 4. It is a recess with a depth. The central oil groove 9, the V-shaped oil groove 10, and the parallel oil groove 11 provided on the outer peripheral surface of the crown-shaped cage 4 are each deeper in the radial direction from the outer peripheral surface portion that defines the outer diameter of the crown-shaped cage 4. It is a concave part with a thickness.

  The central oil groove 9 extends in the circumferential direction and passes through the central portion in the axial direction of the inner peripheral surface or outer peripheral surface of the crown type retainer 4. The central oil groove 9 communicates between the pockets 8 adjacent in the circumferential direction. A central oil groove 9 is provided between these pockets 8. The central oil groove 9 is continuous with a constant width in the axial direction. The center of the width of the central oil groove 9 is set at a position that bisects the axial width of the inner peripheral surface or outer peripheral surface of the crown-shaped cage 4.

  The V-shaped oil groove 10 extends in a V shape toward one circumferential direction (the direction of arrow A in FIGS. 1 and 4). The V-shaped oil groove 10 gradually approaches the central oil groove 9 at a constant angle from both axial ends of the inner peripheral surface or outer peripheral surface of the crown-shaped cage 4 toward the circumferential direction, It intersects with the central oil groove 9 at the axially central portion of the peripheral surface or outer peripheral surface. Each central oil groove 9 intersects with two or more V-shaped oil grooves 10. The crossing interval is set to a constant interval in the circumferential direction.

  Now, consider the case where the bearing rotation direction of the ball bearing shown in FIG. 2 is in the direction of arrow A shown in FIGS. In this case, the ball 3 revolves in the direction of the arrow A, and the crown-shaped cage 4 also rotates in the direction of the arrow A. Part of the lubricant (oil) in contact with the inner and outer peripheral surfaces of the crown-shaped cage 4 enters the central oil groove 9 and the V-shaped oil groove 10. The lubricant that has entered flows relatively to the other side in the circumferential direction opposite to the arrow A direction. As the lubricant flows through the central oil groove 9, the flow of the lubricant is rectified. Further, a part of the lubricant flowing through the central oil groove 9 branches to both oblique sides of the V-shaped oil groove 10. The lubricant that has entered the V-shaped oil groove 10 from the central oil groove 9 or the lubricant that has directly entered the V-shaped oil groove 10 spreads the V-shaped oil groove 10 in a V-shape opposite to the arrow A direction. To flow. The lubricant flowing through the V-shaped oil groove 10 flows through only one of both oblique sides of the V-shaped oil groove 10 and is smoothly discharged to the side of the inner peripheral surface and outer peripheral surface of the crown-shaped cage 4. The The lubricant discharged from the V-shaped oil groove 10 diffuses to both sides of the crown-shaped cage 4 with momentum. The lubricant flowing through the central oil groove 9 also branches at the next intersecting V-shaped oil groove 10 and is also discharged from this V-shaped oil groove 10. In this way, the lubricant flowing through the central oil groove 9 branches into the intersecting V-shaped oil grooves 10 one after another, and is discharged from each V-shaped oil groove 10 to both sides of the crown-shaped cage 4. The shape of each V-shaped oil groove may be other than a sharp V-shape, and includes a U-shape. Moreover, the case where it comprises not only a straight line but a curve is also included.

  As shown in FIG. 6A, the cross-sectional shape of the V-shaped oil groove 10 is U-shaped. The cross section of the V-shaped oil groove 10 refers to a cross section on a virtual plane perpendicular to the flow path of the V-shaped oil groove 10. The cross-sectional shape of the V-shaped oil groove 10 refers to the flow path shape of the V-shaped oil groove 10 in the cross-section. The V-shaped oil groove 10 is continuous in the groove length direction in the illustrated cross-sectional shape. The U-shaped cross-sectional shape means that the groove bottom surface of the V-shaped oil groove 10 has a shape in which the groove width is enlarged from the groove bottom in a curved shape. The cross-sectional shape of the V-shaped oil groove may be changed to a V shape like a V-shaped oil groove 10 ′ shown in FIG. The V-shaped cross-sectional shape means that the groove bottom surface of the V-shaped oil groove 10 has a shape in which the groove width is linearly expanded from the groove bottom. When the cross-sectional shape is U-shaped or V-shaped like the V-shaped oil grooves 10 and 10 ', compared to a V-shaped oil groove having a straight groove bottom surface along the axial direction in the cross-section. Since the channel cross-sectional area of the V-shaped oil grooves 10 and 10 ′ becomes narrow, the lubricant easily flows through the V-shaped oil grooves 10 and 10 ′ quickly.

  As shown in FIGS. 1, 3, and 4, the parallel oil groove 11 extends from the side of the pocket 8 along the V-side oil groove 10. The parallel oil groove 11 is an oil passage having a shape obtained by removing the pocket 8 from the V-shaped oil groove 10. Two or more parallel oil grooves 11 are provided on the side of each pocket 8. The cross-sectional shape of the parallel oil groove 11 is the same as that of the V-shaped oil groove 10. When the crown-shaped cage 4 rotates in the direction of the arrow A, the lubricant that has entered the parallel oil groove 11 does not go to the pocket 8 but is discharged to the side of the crown-shaped cage 4. The parallel oil groove 11 is for discharging the lubricant to the side of the crown-shaped cage 4 even in a circumferential region where the V-shaped oil groove 10 cannot be provided for arranging the pockets 8. It may be omitted.

  The entirety of the crown type cage 4 is made of resin. Examples of the resin include polyamide resin (PA46, PA66, PA9T, etc.), polyether ether ketone resin (PEEK), or polyphenylene sulfide resin (PPS).

  The above-described crown type cage 4 is used for a ball bearing in which the bearing rotation direction is limited to only one circumferential direction (the direction of arrow A in FIGS. 1 and 4). Examples of such ball bearings include those that support a rotating part provided in a vehicle transmission. An example is shown in FIG.

  The transmission shown in FIG. 7 is a multi-stage transmission that changes the gear ratio stepwise, and the above-described implementation is performed as the ball bearing B that rotatably supports the rotating portion (for example, the input shaft S1 and the output shaft S2). The ball bearing which concerns on an example is provided. The illustrated transmission includes an input shaft S1 to which engine rotation is input, an output shaft S2 provided in parallel with the input shaft S1, and a plurality of gear trains G1 to G4 that transmit the rotation from the input shaft S1 to the output shaft S2. Each of the gear trains G1 to G4 and a clutch (not shown) incorporated between the input shaft S1 or the output shaft S2, and the gear trains G1 to G4 used by selectively engaging the clutches. This changes the speed ratio of the rotation transmitted from the input shaft S1 to the output shaft S2. The rotation of the output shaft S2 is output to the output gear G5, and the rotation of the output gear G5 is transmitted to the differential gear or the like. The input shaft S1 and the output shaft S2 are rotatably supported by ball bearings B, respectively. In addition, this transmission uses a lubricating oil as a lubricant, and the lubricating oil is splashed from a nozzle (not shown) provided inside the housing H by splashing the lubricating oil as the gear rotates. Thus, the splashed or sprayed lubricating oil is applied to the side surface of each ball bearing B.

  For example, since the input shaft S1 is a rotating unit that transmits driving force from the engine, the input shaft S1 rotates only in one direction. The direction of rotation coincides with the direction of arrow A in FIGS. 1, 4, and 5. During rotation of the input shaft S <b> 1, the ball bearing B and the crown type cage 4 that support the input shaft S <b> 1 Rotate only to.

  During operation of the ball bearing B that supports the input shaft S1, the crown cage 4 rotates only in the direction of the arrow A. A part of the lubricating oil present inside the bearing of the ball bearing B is a central oil on the inner peripheral surface and outer peripheral surface of the crown-shaped cage 4 that rotates in the direction of arrow A as shown in FIGS. It enters the groove 9 and the V-shaped oil groove 10 and flows relatively to the other side in the circumferential direction opposite to the arrow A direction. Since the lubricating oil flows through the central oil groove 9, the flow of the lubricating oil is rectified, so that the agitation resistance is reduced. In addition, the lubricating oil that has entered the V-shaped oil groove 10 flows in the direction of the V-shaped oil groove 10 in a direction opposite to the arrow A direction. Since the V-shaped oil groove 10 passes through the portion between the pockets 8 adjacent in the circumferential direction, the lubricating oil flowing through the V-shaped oil groove 10 does not cross the inner and outer peripheral surfaces of the crown-shaped cage 4 and is smooth. Are discharged to the side of the inner and outer peripheral surfaces of the crown-shaped cage 4. Since the lubricating oil discharged from the V-shaped oil groove 10 diffuses to both sides of the crown-type cage 4 with a momentum, it is difficult to stay near the crown-type cage 4 inside the bearing. This also reduces the stirring resistance.

  Thus, in the crown type cage 4 or the ball bearing B according to the embodiment, the flow of the lubricating oil is rectified near the axially central portion of the inner circumferential surface and the outer circumferential surface of the crown type cage 4 while the bearing is rotating. As a result, the stirring resistance is reduced, and the rectified lubricating oil is prevented from staying near the crown-shaped cage 4 inside the bearing, thereby further reducing the stirring resistance. Therefore, the crown-type cage 4 or the ball bearing B according to the embodiment can further reduce the stirring resistance by the resin-made crown-type cage 4 rotating in the ball bearing B. As a result, the ball bearing B Rotational torque can be reduced and heat generation can be suppressed.

  Further, the lubricating oil flowing through the central oil groove 9 branches one after another to both sides of the intersecting V-shaped oil grooves 10, and from each V-shaped oil groove 10 to both the inner and outer peripheral surfaces of the crown-shaped cage 4. It is discharged towards. For this reason, the crown type cage 4 or the ball bearing B according to the embodiment can promote the discharge of the lubricating oil that becomes a resistance for the ball 3.

  Further, as shown in FIGS. 6A and 6B, the V-shaped oil groove 10, 10 ′ has a U-shaped or V-shaped cross-sectional shape. 10 'is easy to flow quickly. For this reason, the crown type cage 4 or the ball bearing B according to the embodiment makes it difficult for foreign matter to stay in the V-shaped oil grooves 10 and 10 ′, and the lubricating oil is easily discharged.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. Accordingly, the scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Crown type cage 8 Pocket 9 Center oil groove 10, 10 'V type oil groove B Ball bearing S1 Input shaft (rotating part)

Claims (6)

In the crown holder made of resin in which pockets penetrating between the inner peripheral surface and the outer peripheral surface are formed at predetermined intervals in the circumferential direction, and balls are accommodated in the pockets,
A central oil groove provided at one or more locations on each of the inner peripheral surface and the outer peripheral surface and extending in the circumferential direction;
A plurality of V-shaped oil grooves provided in each of the inner peripheral surface and the outer peripheral surface and extending in a V-shape that is pointed toward one circumferential direction;
The central oil groove passes through the axially central portion of the inner peripheral surface or the outer peripheral surface,
The V-shaped oil groove passes through a portion between pockets adjacent in the circumferential direction;
The crown type cage is used for a ball bearing in which the bearing rotation direction is limited to only one circumferential direction. The V-shaped oil groove gradually approaches the central oil groove from one axial end of the inner peripheral surface or the outer peripheral surface toward one side in the circumferential direction, and the axially central portion of the inner peripheral surface or the outer peripheral surface Intersects the central oil groove,
The crown type retainer according to claim 1, wherein the central oil groove intersects with two or more V-shaped oil grooves.   The crown type cage according to claim 1 or 2, wherein a cross-sectional shape of the V-shaped oil groove is U-shaped or V-shaped.   The crown type cage according to any one of claims 1 to 3, wherein a polyamide resin, a polyether ether ketone resin, or a polyphenylene sulfide resin is used as the resin.   A ball bearing comprising the crown type cage according to any one of claims 1 to 4.   The ball bearing according to claim 5, wherein the ball bearing supports a rotating part provided in the transmission.

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