JP2006170419A - Outer ring for half-split bearing and half-split bearing provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with a thrust washer used in a power transmission device, reduce rotation torque in the power transmission device, improve rotation characteristic, reduce cost of parts and assembly, and eliminate necessity of replacement, repair, and inspection. <P>SOLUTION: This outer ring 10 for the half-split bearing with a cage is composed of two substantially semi-cylindrical divided outer rings 12, 14. Both of divided outer rings are matched on mutual end faces at both ends in the circumferential direction and are provided with collar parts 12b, 14b facing inward in the radial direction for regulating travel in the axial direction of the bearing cage 24 on both sides in the axial direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an outer ring for a split bearing and a split bearing having the same. The split bearing can be used for a power transmission device (power train) in an internal combustion engine of a vehicle such as an automobile, in particular, a power transmission device including a crankpin and a connecting rod large end.

In an internal combustion engine such as an automobile, a connecting rod has a small end connected to a piston pin and a large end connected to a crank pin. The connecting rod rotates the crank pin around the main rotation axis as the piston reciprocates (see Patent Document 1). Both ends of this crank pin are press-fitted between eccentric positions of a pair of crank webs facing each other with a gap. In such an internal combustion engine, as will be described with reference to FIG. 7, a needle roller bearing 20 with a cage is interposed between the inner diameter surface of the connecting rod large end portion 26 and the outer diameter surface of the crank pin 28. It is disguised. This needle roller bearing 20 has a split bearing configuration. A thrust washer 32 is interposed in the crank pin 28 in a free state, located between the thrust receiving surface of the crank web 30 and the axial end surface of the connecting rod large end portion 26. The thrust washer 32 is disposed so that the needle roller bearing 20 does not directly contact the crank web 30. The needle roller bearing 20 includes a plurality of needle rollers 22 disposed between both raceways, with the inner diameter surface of the connecting rod large end portion 26 being an outer ring raceway and the outer diameter surface of the crank pin 28 being an inner ring raceway. And a cage 24 for holding each of the needle rollers 22. However, since the thrust washer 32 is in an unconstrained free state, the crank pin 28 slides or collides with the thrust receiving surface of the crank web 30 and the axial end surface of the connecting rod large end portion 26. A rotational torque is applied to the crank pin 28, which adversely affects the rotational characteristics of the crank pin 28. Further, the thrust washer 32 is expensive in terms of parts and assembly, and is subject to uneven wear due to the above-mentioned sliding and collision, so that the time for replacement and repair inspection comes early, and the cost increases.
JP 2002-188455 A

  The problem to be solved by the present invention is that the thrust washer used in the power transmission device can be omitted, the rotational torque in the power transmission device is reduced, the rotational characteristics are improved, and the parts cost and assembly cost are reduced. The purpose is to eliminate the need for replacement and repair inspection.

  An outer ring for a split bearing with a cage according to the present invention is composed of two split outer rings each having a substantially semi-cylindrical shape, and the both split outer rings are joined to each other at both end faces in the circumferential direction, and both axial sides thereof Further, it is provided with a radially inward flange that restricts the axial movement of the bearing cage.

  According to the present invention, the split outer ring is provided with a radially inward flange that restricts the axial movement of the cage. For example, when applied to a power transmission device including a connecting rod large end and a crankpin, it is necessary in the past. The thrust washer that has been used can be omitted, and it is possible to reduce parts costs, reduce assembly costs, and eliminate the need for replacement and repair inspection.

  The above-mentioned split bearing can be applied to a needle roller bearing whose rolling elements are needle rollers, but can also be applied to a cylindrical roller bearing whose rolling elements are cylindrical rollers, and other roller bearings.

  The said collar part may be provided in the whole circumferential direction of the axial direction both sides of both division | segmentation outer rings, and may be provided in several places.

  When both split outer rings are integrated by fitting with the male and female fittings on the circumferential end surface of the collar, both split outer rings are not affected by the inner diameter surface of the split outer ring constituting the raceway of the rolling element. Can be matched. The male-female fitting portion can be formed in a concavo-convex shape with the concave portion on the female side and the convex portion on the male side.

  There are no particular limitations on the end face shape at both ends in the circumferential direction of both split outer rings, but there are axially slanted linear shapes, S-shapes, sawtooth shapes, etc., and the clearance between the end faces at both ends in the circumferential direction of both split outer rings It is preferable that can be made into a gap shape that is inclined in the axial direction.

  The power transmission device to which the split bearing of the present invention is applied is not limited to the power transmission device of a vehicle internal combustion engine, but a driving side cylindrical body which is a side for transmitting power and a driven side which is a side for receiving power transmission. The present invention can be applied to a power transmission device including a side shaft body. For example, in this power transmission device, when the inner surface of another member is opposed to the outer surface of the cage of the split bearing, the flange portion of the outer ring is provided between the inner surface of the other member and the outer surface of the cage. Can be positioned.

  The split bearing according to the present invention applies a connecting rod large end as an example of the driving side cylindrical body, applies a crank pin as an example of the driven side shaft body, and separates the separate members with a gap therebetween. The present invention can be applied to a pair of crank webs whose both ends are press-fitted. The connecting rod large end and the crank pin constitute a power transmission device for transmitting the power of the internal combustion engine to the crankshaft side in the internal combustion engine of the vehicle. The split bearing of the present invention can be applied by being interposed between the inner diameter surface of the connecting rod large end and the outer diameter surface of the crank pin. When applied to this power transmission device, the split outer ring is provided with a radially inward flange that restricts the axial movement of the cage, so that the thrust washer that has been required in the past can be omitted, reducing the component cost, It is possible to reduce assembling costs and eliminate the need for replacement and repair inspection.

  According to the present invention, since the thrust washer disposed between the thrust receiving surface of the crank web and the axial end surface of the connecting rod large end portion can be omitted, the rotational characteristics of the crank pin are improved, the cost of parts is reduced, It is possible to reduce assembly costs and eliminate the need for replacement and repair inspection.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 are related to the configuration of the outer ring in the needle roller bearing with a cage according to the embodiment, FIG. 4 is related to the needle roller bearing provided with the outer ring, and FIG. The present invention relates to a power transmission device in which a needle roller bearing is incorporated.

  The outer ring 10 will be described with reference to FIGS. 1 to 3. The outer ring 10 includes two first and second divided outer rings 12 and 14 each having a semi-cylindrical shape. The circumferential outer ends 12a, 14a of the split outer rings 12, 14 are linearly inclined in the circumferential direction, and the gap between the end faces of the both ends 12a, 14a is inclined in the circumferential direction and passes over the gap. The rolling noise of the needle rollers that are rolling elements can be suppressed. Radially inward flange portions 12b and 14b are continuously formed on both sides in the axial direction of both split outer rings 12 and 14 and in the entire circumferential direction. Male and female fitting portions 12c and 14c having an uneven shape in the axial direction are formed at both ends in the circumferential direction of the flange portions 12b and 14b.

  As described above, the outer ring 10 according to the embodiment includes the two divided outer rings 12 and 14 having a substantially semi-cylindrical shape, and the divided outer rings 12 and 14 are joined at the end surfaces at both ends in the circumferential direction. Further, radially inward flange portions 12c and 14c for restricting axial movement of a cage 24 of a needle roller bearing 20 to be described later are provided on both sides in the axial direction, and circumferential ends of the flange portions 12c and 14c are provided. The male and female fitting portions 12c and 14c provided on the two are integrated together.

  FIG. 4 shows a needle roller bearing 20 with a cage incorporating the outer ring 10 described with reference to FIGS. 1 to 3 as a split bearing. The needle roller bearing 20 includes an outer ring 10 composed of two divided outer rings 12 and 14, a plurality of rolling elements (needle rollers) 22 disposed on the inner diameter surface of the outer ring 10, and two divided cages 24 a and 24 b. And a holder 24 that holds the rolling elements 22 together.

  With reference to FIG. 5, the usage form which incorporated the needle roller bearing 20 of FIG. 4 in the power transmission device in the internal combustion engine of vehicles, such as a motor vehicle, is demonstrated. This power transmission device includes a connecting rod large end portion 26 and a crankpin 28.

  The needle roller bearing 20 is interposed between the inner diameter surface of the connecting rod large end portion 26 and the outer diameter surface of the crank pin 28. A conventional thrust washer is not interposed between the thrust receiving surface of the crank web 30 and the axial end surface of the connecting rod large end portion 26.

  As described above, in the needle roller bearing 20 interposed between the inner diameter surface of the connecting rod large end portion 26 and the outer diameter surface of the crank pin 28, the cage 24 is formed by the flange portions 12b and 14b of the outer ring 10. The movement to both sides in the axial direction is restricted. In this case, the inner diameter dimensions of the flange portions 12 b and 14 b are smaller than the outer diameter dimension of the cage 24.

  Thus, in the above power transmission device, since the thrust washer is not disposed between the thrust receiving surface of the crank web 30 and the axial end surface of the connecting rod large end portion 26, the thrust in the free state as in the prior art. The washer slides and collides with the thrust receiving surface of the crank web 30 and the axial end surface of the connecting rod large end portion 26 so as to give a rotational torque to the crank pin 28 to adversely affect the rotational characteristics. There is nothing wrong. Further, by eliminating the thrust washer, it is possible to reduce the parts cost and assembly cost, and it is also possible to reduce the cost necessary for replacement and repair inspection of the thrust washer.

  The outer ring 10 according to another embodiment of the present invention will be described with reference to FIG. The outer ring 10 is composed of two substantially semi-cylindrical split outer rings 12 and 14 as in the above embodiment. The split outer rings 12 and 14 have large end portions 12d and 14d that protrude in the circumferential direction at one end on both sides in the axial direction, and small protrusion portions 12e that protrude in the other end in the circumferential direction at the other end in the circumferential direction. 14e. In the first split outer ring 12, between the large convex portion 12d and the small convex portion 12e, there is a steep inclined surface 12f from the small convex portion 12e side and a gently inclined inclined surface 12g from the large convex portion 12d side. A recess 12h is formed. In the second split outer ring 14, between the large convex portion 14d and the small convex portion 14e, there is a steep inclined surface 14f from the small convex portion 12e side and a gently inclined inclined surface from the large convex portion 14d side. A recess 14h made of 14g is formed.

  The split outer rings 12 and 14 having the above-described configuration are provided with radially inward flange portions 12i and 14i at a plurality of circumferential positions on both sides in the axial direction. The flanges 12i and 14i may be formed simultaneously when a hoop material or the like is processed with a punch tool when processing an outer ring having a fixed length, or only the flanges 12i and 14i may be separately processed. Thereafter, the flange portions 12i and 14i are bent, and the divided outer rings 12 and 14 are bent into a substantially semicylindrical shape.

  The outer ring 10 shown in FIG. 6 is incorporated in the needle roller bearing 20 shown in FIG. 4, and this needle roller bearing 20 can be incorporated in the power transmission device shown in FIG. As a result, the outer ring 10 can restrict the axial movement of the cage 24 by the plurality of flanges 12i, 14i in the circumferential direction, and the thrust washer that has been conventionally required can be eliminated. Similar effects can be obtained.

  The present invention is not limited to the above-described embodiment, and includes various changes or modifications within the scope described in the claims.

It is a disassembled perspective view of the outer ring | wheel which concerns on embodiment of this invention. It is sectional drawing in the collar part of the outer ring | wheel of FIG. It is a front view of the outer ring | wheel of FIG. It is a disassembled perspective view of the needle roller bearing with a cage | basket provided with the outer ring | wheel of FIG. It is sectional drawing of the power transmission device incorporating the needle roller bearing of FIG. It is a disassembled perspective view of the outer ring | wheel which concerns on other embodiment of this invention. It is sectional drawing of the conventional power transmission device incorporating the thrust washer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer ring 12 1st division | segmentation outer ring 12a Both ends 12b Eaves part 12c Male and female fitting part 14 2nd division | segmentation outer ring 14a Both ends 14b Eccentric part 14c Male and female fitting part 20 Needle roller bearing 22 Needle roller 24 Cage 26 Large end of connecting rod 28 Crank pin 30 Crank web

Claims (4)

In the outer ring used for the split bearing with cage,
It consists of two split outer rings that are almost semi-cylindrical,
The two split outer rings are fitted at the end faces of both ends in the circumferential direction, and are provided with radially inward flanges that restrict axial movement of the cage of the bearing on both axial sides thereof. Features an outer ring for split bearings.   2. The split bearing outer ring according to claim 1, wherein the two split outer rings are provided with the flanges at a plurality of circumferential positions on both axial sides thereof.   3. The split bearing outer ring according to claim 1, wherein the two split outer rings are integrated by fitting of male and female fitting portions provided on the circumferential end surfaces of the flange portions of each other. .   A split bearing with a cage, comprising the outer ring according to any one of claims 1 to 3.

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