JP2010014193A - Tapered roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tapered roller bearing capable of reducing agitating torque, by reducing a lubricating oil quantity staying inside the bearing by enhancing the discharge effect of lubricating oil. <P>SOLUTION: A resin cage 5 for holding a tapered roller 4 at a predetermined interval, has a small diameter annular part 6, a large diameter annular part 7, and a plurality of column parts 8 for connecting the small diameter annular part 6 and the large diameter annular part 7 and arranged at a substantially equal interval in the peripheral direction. A circular arc part 40 in which an inclination to a rotary shaft O of a column part inner peripheral surface on the small diameter side is larger than an inclination to the rotary shaft O of the column part inner peripheral surface on the large diameter side, is formed on an inner peripheral surface 32a of a projecting part inner diameter part 32 for constituting a part of an inner peripheral surface 8a of the column parts 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing used in oil lubrication, and more particularly, to a tapered roller bearing used in a transmission for an automobile or a differential gear in an automobile.

  Tapered roller bearings support large radial loads and axial loads, and can be used at high speed rotation and are compact. Therefore, tapered roller bearings are often used in the reduction gears of automobiles such as transmissions and differential gears. In such a tapered roller bearing, the lubricating oil flows in between the small ring portion of the inner ring and the small diameter annular portion side end of the cage due to the pump action accompanying the rotation of the bearing, and the large ring portion of the inner ring and the cage It is comprised so that it may flow out from between the large diameter annular part side edge parts.

  On the other hand, the rotational torque of tapered roller bearings is mainly caused by the frictional resistance between the tapered rollers and the inner ring and the stirring resistance of the lubricating oil that stays inside the bearing. In roller bearings, the agitation resistance of lubricating oil is a major factor. When used in a reduction gear part of an automobile, etc., there is a problem that the supply amount of lubricating oil is large, so that the stirring resistance of the lubricating oil tends to increase.

  As shown in FIG. 12, in the tapered roller bearing 100 described in Patent Document 1, the gap between the inner diameter end surface 101a of the press-molded metal cage 101 and the outer peripheral surface 102b of the smaller diameter side end portion 102a of the inner ring 102 is reduced. Thus, it has been proposed to reduce the stirring torque by forming a labyrinth seal and reducing the amount of lubricating oil flowing in.

JP 2005-69421 A

  However, the tapered roller bearing 100 described in Patent Document 1 reduces the agitation torque by reducing the amount of lubricating oil flowing into the bearing, but an air curtain is generated by the rotation of the roller 103 during high-speed rotation. In order to prevent the lubricating oil from entering the bearing, the lubricating oil tends to stay in the gap A between the outer peripheral surface 102c of the small collar portion 102c of the inner ring 102 and the caulking portion 101b of the retainer 101. There was a problem that the torque was likely to rise.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to increase the lubricating oil discharge effect and reduce the amount of lubricating oil staying in the bearing, thereby reducing the stirring torque. It is to provide a roller bearing.

The above object of the present invention can be achieved by the following constitution.
(1) A tapered roller comprising an inner ring, an outer ring, a plurality of tapered rollers capable of rolling in a circumferential direction between the inner ring and the outer ring, and a cage for holding the plurality of tapered rollers at a predetermined interval. A bearing,
The retainer column part has a circular arc part in which the inclination with respect to the rotation axis of the inner peripheral surface of the column part on the small diameter side is larger than the inclination with respect to the rotation axis of the inner peripheral surface of the column part on the large diameter side.
(2) The retainer column portion further includes a tapered portion in which the inner peripheral surface of the column portion is formed in a substantially linear shape, and the inclination of the inner peripheral surface of the column portion is larger than the inclination of the outer peripheral surface of the column portion (1) (3) The retainer column portion connects the small-diameter annular portion and the large-diameter annular portion of the retainer, and the inner peripheral surface of the large-diameter annular portion is a pitch circle diameter of the tapered roller. The tapered roller bearing according to (1) or (2), wherein the tapered roller bearing is located on the outer diameter side.
(4) The tapered roller bearing according to any one of (1) to (3), wherein a roller facing surface of the retainer column part has an arc shape along the shape of the tapered roller.
(5) The tapered roller bearing according to (4), wherein a circumferential clearance between the roller facing surface of the cage column and the tapered roller is 0.05 to 0.4 mm.
(6) The tapered roller bearing according to any one of (1) to (5), wherein the cage is made of resin.

  According to the tapered roller bearing of the present invention, the retainer column portion has an arc portion whose inclination with respect to the rotation axis of the column inner peripheral surface on the small diameter side is larger than the inclination with respect to the rotation axis of the retainer inner peripheral surface on the large diameter side. As a result, the lubricating oil easily flows to the large diameter side. Thereby, the draining effect of the lubricating oil is enhanced, the amount of the lubricating oil staying inside the bearing is reduced, and the stirring torque can be reduced.

  Hereinafter, each embodiment of the tapered roller bearing according to the present invention will be described in detail with reference to the drawings.

<First Embodiment>
First, with reference to FIGS. 1-5, 1st Embodiment of the tapered roller bearing which concerns on this invention is described.
As shown in FIG. 1, the tapered roller bearing 1 of this embodiment includes an inner ring 2 having an inner ring raceway surface 2a formed on the outer peripheral surface, an outer ring 3 having an outer ring raceway surface 3a formed on the inner peripheral surface, and an inner ring raceway. A plurality of tapered rollers 4 capable of rolling in a circumferential direction between the surface 2a and the outer ring raceway surface 3a, and a cage 5 that holds the plurality of tapered rollers 4 so as to be capable of rolling at a predetermined interval are provided.

  The inner ring 2 includes an inner ring raceway surface 2a, a small flange portion 2b formed to protrude radially outward at an end portion on the small diameter side, and a large rod formed to protrude radially outward at an end portion on the large diameter side. The inner ring raceway surface 2a is formed such that the outer diameter gradually increases as the outer peripheral surface of the inner ring 2 moves from the small flange portion 2b to the large flange portion 2c.

  The outer ring 3 is formed so that the outer ring raceway surface 2b gradually increases in diameter from the small diameter side to the large diameter side on the inner peripheral surface of the outer ring 3.

  For example, as shown in FIG. 2, the cage 5 is arranged at substantially equal intervals in the circumferential direction by connecting the small-diameter annular portion 6, the large-diameter annular portion 7, and the small-diameter annular portion 6 and the large-diameter annular portion 7. A plurality of column portions 8 are provided, and the small diameter annular portion 6, the large diameter annular portion 7, and the adjacent column portion 8 constitute a pocket 9 that holds the tapered roller 4.

  The inner peripheral surface of the small-diameter annular portion 6 of the cage 5 is disposed so as to face the small collar portion 2b of the inner ring 2 in a substantially parallel proximity, and the inner peripheral surface 6a of the small-diameter annular portion 6 and the outer peripheral surface of the small collar portion 2b Thus, the labyrinth seal portion 11 is formed.

As shown in FIGS. 3 and 4, for example, as shown in FIGS. 3 and 4, the retainer 5 has a pillar body 20 that connects the small-diameter annular part 6 and the large-diameter annular part 7, and a radially inward direction from the pillar part body 20. And has a protruding portion 30 formed to protrude. The column main body 20 has side surfaces 20b that are slightly narrower inward in the radial direction on both side surfaces in the circumferential direction, and further extends inward in the radial direction from the inner peripheral surface of the column main body 20. A convex outer diameter portion 31 that becomes narrower and a convex inner diameter portion 32 that is uniform in width from the convex outer diameter portion 31 and that is closer to the inner diameter side than the small flange portion 2b of the inner ring 2 and to the vicinity of the inner ring raceway surface 2a are formed. Has been. A convex portion 30 is constituted by the convex outer diameter portion 31 and the convex inner diameter portion 32.
The cage 5 is positioned in the circumferential direction by the side surface 31b of the convex outer diameter portion 31 being a roller guide surface and abutting the tapered roller 4, and is guided by the tapered roller 4 during rotation.

  The inner peripheral surface 8a of the column portion 8, that is, the inner peripheral surface 32a of the convex portion inner diameter portion 32, the convex outer diameter portion 31 continuous from the inner peripheral surface 32a, and the inner peripheral surfaces 31a and 20a of the column main body 20 are, for example, As shown in FIG. 5, an arc portion 40 formed in an arc shape is provided.

  The arc portion 40 is formed so that the inclination with respect to the rotation axis O on the inner diameter side is larger than the inclination with respect to the rotation axis O on the outer diameter side. That is, the inclination with respect to the rotation axis O of the inner peripheral surface 32 a of the convex inner diameter portion 32 is formed larger than the inclination with respect to the rotation axis O of the inner peripheral surface 20 a of the columnar body 20.

  Therefore, as shown in FIG. 1, the sectional area defined by the radial distance between the adjacent tapered roller 4, the inner peripheral surface 8a of the column portion 8, and the inner ring raceway surface 2a is larger than the sectional area A1 on the small-diameter annular portion 6 side. The cross-sectional area A2 on the outer diameter annular portion 7 side is larger.

  The large-diameter annular portion 7 of the cage 5 is formed such that its inner peripheral surface 7a is positioned on the radially outer diameter side from the pitch circle diameter P of the tapered roller, and the large collar portion 2c of the inner ring 2 and the large-diameter annular portion An opening for discharging the lubricating oil is secured between the inner peripheral surface 7a of 7.

  The cage 5 is made of a resin, and the resin materials include polyamide resins such as polyamide 46 and polyamide 66, polybutylene terephthalate, polyferlen salside (PPS), polyamide imide (PAI), thermoplastic polyimide, polyether ether ketone. (PEEK), polyether nitrile (PEN) and the like are exemplified. Moreover, the rigidity and dimensional accuracy of the cage 5 can be improved by appropriately adding about 10 to 50 wt% of a fibrous filler such as glass fiber or carbon fiber to the resin. The cage may be made of metal, but the inertial mass of the cage itself can be made sufficiently small by forming it with a synthetic resin, so that the weight of the bearing and the rotation speed can be increased accordingly. Can do.

  In the tapered roller bearing 1 configured as described above, the lubricating oil flows from the gap between the small flange portion 2b of the inner ring 2 and the inner peripheral surface 6a of the small-diameter annular portion 6 of the retainer 5 by the pump action accompanying the rotation of the bearing. It flows into the inside of the bearing through the labyrinth seal portion 11 and flows out from the opening on the large-diameter annular portion 7 side by centrifugal force due to the rotation of the tapered roller bearing 1.

  According to the tapered roller bearing 1 of the present embodiment, the arcuate arc portion 40 is formed on the inner peripheral surface 8a of the column portion 8 so that the inclination with respect to the rotation axis O on the small diameter side is larger than the inclination with respect to the rotation axis O on the large diameter side. Therefore, the gap area formed by the inner ring raceway surface 2a of the inner ring 2 and the inner peripheral surface 8a of the column part 8 of the cage 5 is small on the small diameter annular part side and large on the large diameter annular part side, and the pump effect The influence of becomes stronger. Thereby, discharge | emission of the lubricating oil inside a bearing is accelerated | stimulated, and stirring torque can be reduced.

  Furthermore, as indicated by the arrows in FIG. 5, the inner peripheral surface 8 a of the column portion 8 gradually increases in diameter from the small-diameter annular portion 6 toward the large-diameter annular portion 7, so that the lubricant staying in the tapered roller bearing 1 is retained. The oil is guided to the inner peripheral surface 8a by the centrifugal force generated with the rotation of the tapered roller bearing 1, and a flow of lubricating oil in the direction of the arrow is generated, and the discharge from the tapered roller bearing 1 is promoted.

  Further, since the inner peripheral surface 7a of the large-diameter annular portion 7 of the cage 5 is formed so as to be positioned on the radially outer diameter side with respect to the pitch circle diameter P of the tapered roller, it is larger than the large collar portion 2c of the inner ring 2. A large opening area is ensured between the inner peripheral surface 7 a of the radial annular portion 7. Accordingly, the area of the gap (opening) for the lubricating oil to flow out of the bearing space can be increased, and the lubricating oil discharge performance is improved.

  Further, in the tapered roller bearing 1 according to this embodiment, the labyrinth seal portion 11 is formed by the inner peripheral surface 6a of the small-diameter annular portion 6 and the outer peripheral surface of the small flange portion 2b. By adjusting the amount, the amount of lubricating oil flowing into the tapered roller bearing 1 can be adjusted, and the stirring torque can be reduced.

  Furthermore, the volume of the internal space of the tapered roller bearing 1 is reduced by the volume of the convex portion 30 provided on the column portion 8 of the cage 5. As a result, the amount of lubricating oil in the internal space of the bearing 1 can be reduced, and the stirring torque can be reduced. In the present embodiment, as shown in FIG. 1, the innermost diameter portion 33 of the convex portion 30 is located on the smaller diameter side than the small collar portion 2b of the inner ring 2, but it is not necessarily required to be on the smaller diameter side than the small collar portion 2b. However, it may be on the pitch circle diameter P or on the smaller diameter side than the pitch circle diameter P.

Second Embodiment
The tapered roller bearing according to the second embodiment is the same as the tapered roller bearing according to the first embodiment of the present invention except that the shape of the column of the cage is different. The description will be simplified or omitted.

  As shown in FIG. 6, the cage 5A used in the tapered roller bearing of the second embodiment includes an inner circumferential surface 20a of the column body 20 from the arc portion 40 in the cage 5 of the first embodiment. Let the inclination of the peripheral surface 20a be the parallel part 50 formed substantially the same as the inclination of the outer peripheral surface.

  Thereby, also in the holder | retainer 5A of 2nd Embodiment, the effect similar to 1st Embodiment can be acquired.

<Third Embodiment>
The tapered roller bearing according to the third embodiment is the same as the tapered roller bearing according to the first embodiment of the present invention except that the shape of the retainer column is different. The description will be simplified or omitted.

  As shown in FIG. 7, the cage 5B used in the tapered roller bearing of the third embodiment is such that, in the cage 5 of the first embodiment, the inner peripheral surface 20a of the pillar body 20 is tapered from the arc portion 40. Part 60.

  The taper portion 60 also has an inner peripheral surface formed in a substantially linear shape, and the inclination of the inner peripheral surface with respect to the rotation axis O is larger than the inclination of the outer peripheral surface with respect to the rotation axis O. The thickness (thickness) decreases from the small-diameter annular portion 6 side toward the outer-diameter annular portion 7 side.

  Thereby, also in the holder | retainer 5B of 3rd Embodiment, the effect similar to 1st Embodiment can be acquired.

<Fourth embodiment>
The tapered roller bearing according to the fourth embodiment is the same as the tapered roller bearing according to the first embodiment of the present invention except that the shape of the column of the cage is different. The description will be simplified or omitted.

  As shown in FIG. 8, the cage 5 </ b> C used in the tapered roller bearing of the fourth embodiment is such that the inner peripheral surface 31 a of the convex outer diameter portion 31 extends from the arc portion 40 in the cage 5 of the first embodiment. The inner peripheral surface 20a of the columnar body 20 is formed to be substantially the same as the inclination of the outer peripheral surface from the arc portion 40 to the tapered portion 60 in which the inclination of the inner peripheral surface is larger than the inclination of the outer peripheral surface. It is assumed that the parallel part 50 is made.

Thereby, also in the holder | retainer 5C of 4th Embodiment, the effect similar to 1st Embodiment can be acquired. In the cage 5C of the fourth embodiment, the same effect can be obtained even if the inner peripheral surface 20a of the column part body 20 is the arc part 40 or the taper part 60.
<Fifth Embodiment>
The tapered roller bearing according to the fifth embodiment is the same as the tapered roller bearing according to the first embodiment of the present invention except that the shape of the column of the cage is different. The description will be simplified or omitted.

  As shown in FIG. 9, the cage 5D used in the tapered roller bearing of the fifth embodiment is configured so that the inner peripheral surface 32a of the convex inner diameter portion 32 extends from the arc portion 40 in the cage 5 of the first embodiment. The tapered portion 60 is formed so that the inclination of the peripheral surface is larger than the inclination of the outer peripheral surface, and the inner peripheral surface 20a of the column body 20 is formed so that the inclination of the inner peripheral surface 20a from the arc portion 40 is substantially the same as the inclination of the outer peripheral surface. The parallel part 50 is used.

  Thereby, also in the holder | retainer 5D of 5th Embodiment, the effect similar to 1st Embodiment can be acquired. In the cage 5D of the fifth embodiment, the same effect can be obtained even when the inner peripheral surface 20a of the column part body 20 is the arc part 40 or the taper part 60.

<Sixth Embodiment>
The tapered roller bearing according to the sixth embodiment is the same as the tapered roller bearing according to the first embodiment of the present invention except that the shape of the retainer column is different. The description will be simplified or omitted.

  As shown in FIG. 10, the cage 5E used in the tapered roller bearing of the sixth embodiment is similar to the cage 5 of the first embodiment. The circumferential side surfaces 20b, 31b, and 32b of the column main body 20, the convex outer diameter portion 31, and the convex inner diameter portion 32 are formed into an arc shape along the shape of the tapered roller 4. The shape of the inner peripheral surface of the column part is the same as that in the first embodiment.

  Here, the circumferential gap (pocket gap) between the circumferential side surface 8b of the column 8 and the tapered roller 4 at the position of the pitch circle diameter P of the tapered roller 4 is preferably 0.05 to 0.4 mm. If the pocket clearance is 0.05 mm or less, the tapered roller 4 may be restrained by the column portion 8. If the pocket clearance is 0.4 mm or more, the whirling of the cage 5 becomes large during rotation, increasing vibration and increasing torque. May cause

  According to the tapered roller bearing 1 of the present embodiment, in addition to the effect of the tapered roller bearing of the first embodiment, the volume of the internal space of the tapered roller bearing 1 is further reduced, and the amount of lubricating oil in the lubricating oil inside the bearing is reduced. The stirring torque can be further reduced. Moreover, since the area where the cage 5 and the tapered roller 4 can be contacted is increased by forming the circumferential side surfaces 8b of the column portion 8 constituting the pocket 9 into an arc shape along the shape of the tapered roller 4, the tapered shape is obtained. As soon as the roller 4 is skewed and tilted, it comes into contact with the side surface 8b of the column portion 8 to correct the skew, and the skew of the tapered roller can be suppressed. Therefore, it is possible to suppress torque fluctuations caused by skew.

  In addition, this embodiment can be applied not only to the first embodiment but also to the tapered roller bearings of the second to sixth embodiments.

<Seventh embodiment>
The tapered roller bearing according to the seventh embodiment is the same as the tapered roller bearing according to the sixth embodiment of the present invention except that the shape of the column of the cage is different. The description will be simplified or omitted.

  As shown in FIG. 11, the cage 5F used for the tapered roller bearing of the seventh embodiment is the cage 5E of the sixth embodiment. The circumferential side surfaces 20b, 31b of the column main body 20 and the convex outer diameter portion 31 constituting the circular arc shape along the shape of the tapered roller 4 are formed, and the circumferential side surfaces 32b of the convex inner diameter portion 32 are uniform. The width is configured as follows.

  Thereby, the effect similar to the tapered roller bearing 1 of 6th Embodiment can be acquired. Furthermore, as compared with the tapered roller bearing 1 of the sixth embodiment, the assemblability of the tapered roller 4 is improved.

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, although the cage provided with the large-diameter annular portion 7 is illustrated as the cage in the present embodiment, a so-called comb-type cage that does not include the large-diameter annular portion may be used.

It is an axial sectional view of the tapered roller bearing which is the first embodiment of the present invention. It is a whole perspective view of the holder | retainer shown in FIG. It is a principal part perspective view of the holder | retainer shown in FIG. It is an AA arrow directional view of Drawing 1, and is a radial direction sectional view of a tapered roller bearing which is a 1st embodiment. It is principal part sectional drawing explaining the flow direction of the lubricating oil in the holder | retainer shown in FIG. It is sectional drawing of the holder | retainer integrated in the tapered roller bearing of 2nd Embodiment. It is sectional drawing of the holder | retainer integrated in the tapered roller bearing of 3rd Embodiment. It is sectional drawing of the holder | retainer integrated in the tapered roller bearing of 4th Embodiment. It is sectional drawing of the holder | retainer integrated in the tapered roller bearing of 5th Embodiment. It is an AA arrow directional view of FIG. 1, and is radial direction sectional drawing of the tapered roller bearing of 6th Embodiment. It is radial direction sectional drawing of the tapered roller bearing of 7th Embodiment. It is an axial sectional view of a conventional tapered roller bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tapered roller bearing 2 Inner ring 2a Inner ring raceway surface 2b Small collar part 3 Outer ring 3a Outer ring raceway surface 4 Tapered rollers 5, 5A, 5B, 5C, 5D, 5E, 5F Cage 6 Small diameter annular part 7 Large diameter annular part 8 Column part 8a Column part inner peripheral surface 8b Column part circumferential side surface 9 Pocket 11 Labyrinth seal part 20 Column part main body 20a Column part body inner peripheral surface 20a Column part body circumferential side surface 30 Convex part 31 Outer diameter side convex part 31a Outer diameter Inner circumferential surface 31b of the side convex portion circumferential side surface 32 of the outer diameter side convex portion Inner diameter side convex portion 32a Inner circumferential surface 32a of the inner diameter side convex portion Circumferential side surface 40 of the outer diameter side convex portion Arc portion 50 Parallel portion 60 Tapered portion 9 Pocket O Rotation axis P Pitch conical surface

Claims (6)

A tapered roller bearing comprising an inner ring, an outer ring, a plurality of tapered rollers capable of rolling in a circumferential direction between the inner ring and the outer ring, and a cage for holding the plurality of tapered rollers at a predetermined interval. And
The retainer column part has a circular arc part in which the inclination with respect to the rotation axis of the inner peripheral surface of the column part on the small diameter side is larger than the inclination with respect to the rotation axis of the inner peripheral surface of the column part on the large diameter side.   The said retainer column part is further provided with the taper part in which the inclination of the said column part internal peripheral surface is formed more substantially linearly, and the inclination of the said column part internal peripheral surface is larger than the inclination of a column part outer peripheral surface. Tapered roller bearing The retainer column portion connects the small-diameter annular portion and the large-diameter annular portion of the retainer,
The tapered roller bearing according to claim 1 or 2, wherein an inner peripheral surface of the large-diameter annular portion is located on an outer diameter side with respect to a pitch circle diameter of the tapered roller.   The tapered roller bearing according to any one of claims 1 to 3, wherein a roller facing surface of the retainer column part has an arc shape along the shape of the tapered roller.   The tapered roller bearing according to claim 4, wherein a circumferential clearance between the roller facing surface of the retainer column portion and the tapered roller is 0.05 to 0.4 mm.   The tapered roller bearing according to claim 1, wherein the cage is made of resin.

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