JP2007032693A - Needle roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle roller bearing provided with a regulation means in the axial direction of a cage without being accompanied by machining of a peripheral structure to prevent deviation of the cage in the axial direction. <P>SOLUTION: This needle roller bearing is provided with an outer ring having a plurality of outer ring members 12 divided by a parting line extending in the direction of axis of the bearing, a plurality of needle rollers arranged on a raceway surface of the outer ring so as to roll freely, the cage for holding the needle rollers, and an engaging claw 12b protruding on an inner side in the radial direction from an end part in the axial direction of the outer ring member 12 to regulate travel of the cage in the axial direction. Plate thickness t of the outer ring member 12 and root width B of the engaging claw 12b have the relation of 1.0≤B/t≤4.0. <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 amount of oil supplied to the support portion can be reduced.

  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 shaft 9 is displaced in the axial direction by reducing the shaft diameter of both ends of the shaft 5 and projecting the cage 9 in the radial direction. The needle roller bearing 6 that has been prevented 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 roller bearing provided with a cage axial restriction means that does not involve processing of the peripheral structure in order to prevent the cage from shifting in the axial direction. To do.

  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 plate | board thickness t of an outer ring member and the base width B of an engaging claw have a relationship of 1.0 <= B / t <= 4.0.

  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.

  Here, as a processing method of the outer ring member, for example, it is conceivable that the engaging claw is bent in the thickness direction of the plate-shaped outer ring member and then the entire outer ring member is bent to a predetermined curvature. At this time, if the base width of the engaging claw is large, the rigidity of the engaging claw root becomes high, and the shape of the outer ring member may be deformed. Therefore, by setting the plate thickness t of the outer ring member and the base width B of the engaging claw within a range of 1.0 ≦ B / t ≦ 4.0, deformation of the outer ring member can be prevented. .

  A needle roller bearing according to another aspect of the present invention includes an outer ring having a plurality of outer ring members divided by a dividing line extending in the axial direction of the bearing, and a plurality of rollers arranged on the raceway surface of the outer ring so as to be freely rollable. A needle roller, a cage that holds the plurality of needle rollers, and an engaging claw that protrudes radially inward at an end in the width direction of the outer ring member. The engaging claw has a root portion in the vicinity of the outer ring member and a guide portion that restricts movement of the cage in the axial direction. The width A of the guide portion and the width B of the root portion are 1 ≦ A / B ≦ 3.

  Even in the case of the above configuration, the axial movement of the cage can be restricted without processing the peripheral structure such as the shaft.

  At this time, the guide portion needs to satisfy 1 ≦ A / B in order to ensure the strength necessary for restricting the movement of the cage. In addition, if the width of the guide portion is too large compared to the root portion, the cage may come into contact with the end portion of the guide portion when the bearing rotates, and the engagement claw may be deformed, so A / B ≦ 3 must be satisfied.

  Preferably, the guide portion does not contact the outer ring member. If the guide portion of the engaging claw is so large as to come into contact with the outer ring member, the processing of the outer ring member will be hindered. Therefore, the width A of the guide portion needs to be set in a range that does not interfere with the outer ring member.

  A method for manufacturing a needle roller bearing according to the present invention includes an outer ring having a plurality of outer ring members divided by a dividing line extending in the axial direction of the bearing, and a plurality of needles arranged to be rollable on a raceway surface of the outer ring. Needle roller comprising: a cylindrical roller; a cage that holds a plurality of needle rollers; and an engagement claw that protrudes radially inwardly at an end in the width direction of the outer ring member and restricts movement of the cage in the axial direction It is a manufacturing method of a bearing. Specifically, the method includes a step of bending the outer ring member to a predetermined curvature after the step of bending the engaging claw in the thickness direction of the outer ring member by bending.

  If the engaging claw is bent after the outer ring member is bent to a predetermined curvature, the outer ring member may be deformed when the engaging claw is processed. Therefore, the above problem can be solved by performing a process of bending the outer ring member to a predetermined curvature after the processing of the engaging claw.

  According to the present invention, by providing an engagement claw of an appropriate size, the outer ring member is not deformed, and the needle that can effectively prevent the axial displacement of the cage without processing the peripheral structure. A tapered roller bearing 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. 4A and 4B, 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. 5A, 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. 5B and 5C, one end of the outer ring member 12 in the circumferential direction is a convex shape and the other end is a concave shape. 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 cage 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. 6B, the cage 15 is cut in the axial direction at one place on the circumference, and after the cage 15 is elastically deformed and incorporated into the shaft, the convex portion of the cut portion is formed. 15a and the recessed part 15b are engaged.

  The needle roller bearing 11 having the above-described configuration supports portions that cannot be press-fitted in the axial direction, such as an automobile crankshaft, camshaft, balance shaft, and rocker shaft, because the outer ring 13 and the cage 15 are partially cut. 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, the outer ring member 12 is manufactured in the order shown in FIG. 3, for example. First, an outer shape of the outer ring member 12 is formed by punching (step a). Next, the engaging claw 12b is bent in the thickness direction of the outer ring member 12 by bending (step b), and then the outer ring member 12 is predetermined. (B process).

  When the bending step (c step) of the outer ring member 12 is performed first, the outer ring member 12 may be deformed in the bending step (b step) of the engaging claw 12b. This is because there is a possibility of inhibiting proper rotation.

  When the outer ring member 12 is manufactured by the above-described method, if the base width of the engaging claw 12b is large, the rigidity of the root part 12c is increased, and there is a possibility that the outer ring member 12 may be deformed or the like. Therefore, as shown in FIG. 1, by setting the plate thickness t of the outer ring member 12 and the base width B of the engaging claw 12b to a range of 1.0 ≦ B / t ≦ 4.0, the outer ring member 12 deformation and the like can be prevented.

  Further, as shown in FIG. 2A, the engaging claw 12b has a root portion 12c in the vicinity of the outer ring member 12, and a guide portion 12d for restricting movement of the cage 15 in the axial direction. Here, the guide portion 12d requires a certain degree of strength to restrict the movement of the cage 15. If the width of the guide portion 12d is too large compared to the root portion 12c, the cage 15 may come into contact with the end portion of the guide portion 12d during rotation of the bearing, and the engaging claw 12b may be deformed.

  Therefore, the width A of the guide portion 12d and the width B of the root portion 12c are set in a range satisfying 1 ≦ A / B ≦ 3. Further, the guide portion 12d is set to a width that does not contact the outer ring member 12, as shown in FIG.

  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, the example in which the protrusions 12a are arranged at one place on each outer ring member 12 has been shown. However, the present invention is not limited to this, and it may be arranged only at one place on the entire circumference of the outer ring 13, The outer ring member 12 may be arranged at a plurality of locations.

  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.

  In the above-described embodiment, the example in which the engagement claw 12b is provided on a part of the axial end portion of the outer ring member 12 is shown. However, the engagement claw 12b is provided on the entire axial end portion of the outer ring member 12. It is good as well.

  Further, the cage 15 is not limited to resin, and may be formed of a metal material by press working or the like, or may be a full roller bearing that does not require the cage 15.

  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 relationship between the plate | board thickness of the outer ring member used for the needle roller bearing which concerns on one Embodiment of this invention, and the base width of an engaging claw. It is a figure which shows the relationship between the base part of the engaging nail | claw provided in the outer ring | wheel for needle roller bearings concerning other embodiment of this invention, and a guide part. It is a figure which shows a part of manufacturing process of the outer ring | wheel for needle roller bearings concerning 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 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 engaging claw, 12c root part, 12d guide 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 plate thickness t of the outer ring member and the base width B of the engaging claw are:
1.0 ≦ B / t ≦ 4.0
Needle roller bearings with the relationship 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 protruding radially inward at the widthwise end of the outer ring member;
The engaging claw has a root portion in the vicinity of the outer ring member and a guide portion for restricting movement of the cage in the axial direction,
The width A of the guide portion and the width B of the root portion are:
1 ≦ A / B ≦ 3
Needle roller bearings with the relationship   The needle roller bearing according to claim 2, wherein the guide portion does not contact the outer ring member. 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;
A needle roller bearing manufacturing method comprising: an engaging claw that protrudes radially inwardly at an end in a width direction of the outer ring member and restricts movement of the cage in the axial direction;
A method for manufacturing a needle roller bearing, comprising a step of bending the outer ring member to a predetermined curvature after a step of bending the engaging claw in a thickness direction of the outer ring member by bending.

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