JP2007032692A - Needle roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle roller bearing comprising a retainer control means having the shape not disturbing rotation of needle rollers without machining a peripheral structure, to effectively prevent axial displacement of a retainer. <P>SOLUTION: This needle roller bearing comprises an outer ring 13 having two outer ring members divided by a parting line extending in the axial direction of the bearing, the plurality of needle rollers 14 rotatably mounted on a raceway surface of the outer ring, and the retainer 15 for retaining the needle rollers 14. A face opposite to the retainer 15, of an engagement claw 12b has such a shape that its central portion 12e is projected to a retainer side with respect to both end portions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a needle roller bearing that supports a crankshaft for an automobile engine, a camshaft, a balance shaft, a rocker shaft, and the like.

  Conventionally, as a bearing for supporting the crankshaft 1 or the like of an automobile as shown in FIG. 7, a split type sliding bearing is generally used. Since a slide bearing has a high load capacity, it is suitable as a bearing used in a high load environment.

  However, in recent years, needle-roller bearings are sometimes used in place of sliding bearings in connection with the demand for fuel-saving automobiles in consideration of the environment. Needle roller bearings have a lower load capacity than sliding bearings, but since the frictional resistance during rotation is small, the function can be satisfied even with a small amount of oil supply.

  However, the needle roller bearing that supports the crankpin 2 of the crankshaft 1 cannot be assembled by being press-fitted in the axial direction. Therefore, a needle roller bearing used in such a place is described in, for example, US Pat. No. 1,192,488 (Patent Document 1). The needle roller bearing described in the publication can be incorporated into the crankpin 2 by having outer ring members 4a and 4b divided by a dividing line extending in the axial direction of the bearing as shown in FIG. Become.

Further, as shown in FIG. 9, a needle-like shape including an outer ring 7, a plurality of needle rollers 8 that are arranged to roll on the raceway surface of the outer ring 7, and a cage 9 that holds the needle rollers 8. In the case of supporting the shaft 5 using the roller bearing 6, the cage diameter is reduced at both ends of the bearing of the shaft 5, and cage retainer restricting means 9 a that projects the cage 9 in the radial direction is provided. A needle roller bearing 6 that prevents 9 from shifting in the axial direction is described in Japanese Patent Publication No. 2002-525533 (Patent Document 2).
US Patent No. 1921488 JP-T-2002-525533

  Since the needle roller bearing 6 as shown in FIG. 9 needs to process the shaft 5 in order to prevent the cage 9 from shifting in the axial direction, there is a problem that the processing cost increases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a needle provided with a cage regulating means having a shape that does not interfere with the rotation of the needle roller without processing the peripheral structure in order to effectively prevent the cage from shifting in the axial direction. An object is to provide a tapered roller bearing.

  The needle roller bearing according to the present invention includes an outer ring having a plurality of outer ring members divided by a parting line extending in the axial direction of the bearing, and a plurality of needle rollers arranged to roll on the raceway surface of the outer ring. A retainer that holds the plurality of needle rollers, and an engaging claw that protrudes radially inward at the end in the width direction of the outer ring member and restricts movement of the retainer in the axial direction. And the surface which opposes the holder | retainer of an engaging claw has the shape which the center part protruded to the holder | retainer side rather than both ends.

  With the above configuration, it is possible to restrict the movement of the cage in the axial direction without processing the peripheral structure such as the shaft. At this time, if an axial load is applied to the needle roller bearing, the cage may be caught by the corner portion of the engaging claw and obstruct rotation of the needle roller. Therefore, a needle roller bearing capable of maintaining smooth rotation of the needle roller is obtained by forming the surface of the engaging claw facing the cage so that the center portion protrudes from the both ends toward the cage. Can do.

  The surface of the engagement claw that faces the cage is, for example, a curved surface with a central portion protruding. Or the surface which opposes the holder | retainer of an engaging claw has a taper part in both ends, for example. By setting it as the said structure, since the movement to the axial direction of a holder | retainer will be controlled in a center part, it can prevent effectively a holder | retainer being caught by a corner | angular part.

  Preferably, the retainer has an abutting portion obtained by abutting a cut surface cut in the axial direction, and the amount of projection at the center portion is larger than the play in the axial direction of the abutting portion. From the viewpoint of manufacturing, a certain amount of play is required at the butt portion. However, if one side of the abutting portion protrudes in the axial direction due to this play, there is a risk of being caught by the corner of the engaging claw. Therefore, by setting the amount of protrusion of the central portion larger than the axial play of the abutting portion, it is possible to effectively prevent the cage from being caught by the corner portion.

  According to the present invention, by providing an engaging claw having a central portion on the surface facing the cage, it is possible to prevent the cage from being displaced in the axial direction without processing the peripheral structure, and the needle roller bearing Thus, a needle roller bearing capable of maintaining smooth rotation can be obtained.

  With reference to FIGS. 1-6, the needle roller bearing 11 which concerns on one Embodiment of this invention is demonstrated.

  As shown in FIGS. 3A and 3B, the needle roller bearing 11 includes an outer ring 13 having two outer ring members 12 divided by a dividing line extending in the axial direction of the bearing, and a raceway surface of the outer ring 13. And a plurality of needle rollers 14 that are arranged so as to be freely rollable, and a cage 15 that holds the needle rollers 14.

  As shown in FIG. 4A, the outer ring member 12 includes a protrusion 12 a as a positioning engagement portion that engages with the housing at a position shifted from the center in the circumferential direction, and a width direction of the outer ring member 12. It has an engaging claw 12b that protrudes radially inward from the end and restricts movement of the cage 15 in the axial direction.

  Further, as shown in FIGS. 4B and 4C, one end portion in the circumferential direction of the outer ring member 12 is convex and the other end portion is concave, so that the unevenness of the two outer ring members 12 is uneven. By combining them, a cylindrical outer ring 13 is formed. Here, the dividing line of the outer ring 13 only needs to be able to divide the outer ring 13 in the radial direction, and does not have to exactly coincide with the axial direction.

  The retainer 15 is formed of a resin material, and has pockets for accommodating the needle rollers 14 at a plurality of locations on the circumference as shown in FIG. Further, as shown in FIG. 5B, the retainer 15 is divided in the axial direction at one place on the circumference, and after the retainer 15 is elastically deformed and incorporated into the shaft, the convex portion of the abutting portion is formed. 15a and the recessed part 15b are engaged.

  Since the needle roller bearing 11 having the above-described configuration is a part of the outer ring 13 and the cage 15, it supports parts that cannot be press-fitted in the axial direction such as a crankshaft, a camshaft, a balance shaft, and a rocker shaft of an automobile. Can be used as a bearing.

  Further, by providing the outer ring member 12 with the protrusion 12a, the outer ring 13 is prevented from rotating in the circumferential direction, and the engagement claw 12b is provided to restrict the movement of the cage 15 in the axial direction. Can do.

  Here, as shown in FIG. 6A, when the surface 12c of the engaging claw 12b facing the cage 15 is a flat surface, an axial load is applied to the needle roller bearing 11, thereby causing the abutment. The portion may be displaced in the axial direction, and one side of the portion may be caught with the corner portion 12c of the engaging claw 12b. This causes a rotation failure of the needle roller bearing 11.

  Therefore, the engaging claw 12b of the needle roller bearing 11 according to the embodiment of the present invention has a central portion 12e protruding from a surface 12d facing the retainer 15, for example, as shown in FIG. Let it be a curved surface.

  Thus, by making the surface 12d of the engaging claw 12b facing the cage 15 into a shape in which the central portion 12e protrudes toward the cage from both ends, the cage 15 is prevented from being caught by the corner portion 12c. can do.

Further, a certain amount of play is required at the abutting portion of the cage 15 from the viewpoint of manufacturing. Therefore, as shown in FIG. 1 (b), by setting larger than the axial play amount t ₂ of butting portion protruding amount t ₁ of the central portion 12e of the engaging claw 12b, the butting portion of the retainer 15 Even when it is displaced to the maximum extent, it is possible to prevent the cage 15 and the corner portion 12c from being caught.

In the above-described embodiment, the example in which the surface 12d of the engaging claw 12b facing the cage 15 is a curved surface is shown. However, the present invention is not limited to this, and for example, shown in FIGS. 2 (a) and 2 (b). Thus, it is good also as having the taper part 22f in both ends, and the taper part 22f may be planar shape or curved surface shape. In this case, the protruding amount _{t 3} of the central portion 22e is greater than the axial play amount _{t 4} of the cage 25. Furthermore, the same effect can be expected with any shape in which the central portion 12e of the surface 12d of the engaging claw 12b facing the cage 15 protrudes toward the cage from both ends.

  In the above embodiment, the outer ring 13 is configured by the outer ring member 12 that is divided into two in the radial direction. However, the outer ring 13 is not limited to this and may be divided into an arbitrary number.

  In the above embodiment, an example in which the protrusions 12a and the engaging claws 12b are arranged at one place on each outer ring member 12 has been shown. However, the present invention is not limited to this, and the outer ring member 12 is arranged at only one place on the entire circumference. Alternatively, the outer ring members 12 may be disposed at a plurality of locations.

  The cage 15 is not limited to resin, and may be formed of a metal material by pressing or the like.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is advantageously used for a needle roller bearing that supports a crankshaft, a camshaft, a balance shaft, a rocker shaft, and the like of an automobile.

It is a figure which shows the shape of the engaging claw of the needle roller bearing which concerns on one Embodiment of this invention. It is a figure which shows the shape of the engaging claw of the needle roller bearing which concerns on other embodiment of this invention. It is a figure which shows the needle roller bearing which concerns on one Embodiment of this invention, Comprising: (a) is a front view, (b) is sectional drawing in AA '. It is a figure which shows the outer ring member of the needle roller bearing which concerns on one Embodiment of this invention, Comprising: (a) is a longitudinal cross-sectional view, (b) is the figure which looked at (a) from the B direction, (c) is ( It is the figure which looked at a) from the C direction. It is a figure which shows the holder | retainer of the needle roller bearing which concerns on one Embodiment of this invention, Comprising: (a) is a front view, (b) is sectional drawing in DD 'of (a). It is a figure which shows the relationship between an engaging claw and a holder | retainer when the surface facing the holder | retainer of an engaging claw is a flat surface. It is a figure which shows the crankshaft of a motor vehicle. It is the schematic which shows the outer ring | wheel used for the conventional needle roller bearing, Comprising: The outer ring | wheel which can be divided | segmented to radial direction. It is a figure which shows the conventional needle roller bearing provided with the axial direction control means of the holder | retainer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Crankshaft, 2 Crankpin, 3, 6, 11 Needle roller bearing, 4a, 4b, 12 Outer ring member, 4c Boundary, 5 shaft, 7, 13 Outer ring, 8, 14 Needle roller, 9, 15 Cage, 12a Protrusion, 12b, 22b Engagement claw, 12c, 22c Corner, 12d Face to face cage, 12e, 22e Central part, 22f Tapered part, 15a Convex part, 15b Concave part.

Claims (4)

An outer ring having a plurality of outer ring members divided by a parting line extending in the axial direction of the bearing;
A plurality of needle rollers disposed on the raceway surface of the outer ring so as to freely roll;
A cage for holding the plurality of needle rollers;
An engaging claw that protrudes radially inward at the end in the width direction of the outer ring member and restricts movement of the cage in the axial direction;
The surface of the engagement claw that faces the cage is a needle roller bearing having a shape in which a central portion projects toward the cage from both ends.   The needle roller bearing according to claim 1, wherein a surface of the engagement claw facing the cage is a curved surface from which the central portion protrudes.   The needle roller bearing according to claim 1, wherein a surface of the engagement claw facing the cage has chamfered portions at both end portions. The retainer has a butting portion that butts a cut surface cut in the axial direction,
The needle roller bearing according to any one of claims 1 to 3, wherein a protruding amount of the central portion is larger than an axial play of the abutting portion.

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