JPH01266321A - Dividing method for split bearing - Google Patents

Abstract

PURPOSE:To prevent the misalignment of a bearing race during the assembly thereof by forming an axial split part on the external surface of the bearing race and dividing the bearing race into two pieces along the split part of a rough sine curve. CONSTITUTION:A split part 2 of recessed sine curve groove form is preliminarily formed on the external surface 1a of a bearing race 1. A notch 3 is engraved on one external edge 1b of the race 1 and the split part 2 of sine curve form is so engraved as to reach from the extension line of the notch 3 to the other external edge 1c. The aforesaid sine curve split part 2, the notch 3 and the like are formed via machining before the heat treatment of the bearing race 1. According to the aforesaid construction, misalignment of the bearing race 1 during the assembly thereof can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for dividing a so-called split bearing, in which a bearing ring is mechanically divided and used.

[Conventional technology]

Split bearings are used, for example, to fit an integral crankshaft to the large diameter side of a connecting rod, but when the split bearing is assembled into a housing, the dividing planes do not match perfectly, causing a slight shift in the axial direction. There was a tendency for various problems to occur. As a countermeasure to this problem, various proposals have been made regarding methods of manufacturing split bearings. For example, as disclosed in Japanese Patent Application Laid-open No. 55-44169, in order to successfully divide the dividing surface into a dogleg shape, a special pin is used to hold down the outer diameter of the bearing raceway and at the same time insert a special pin into the hole provided in the dividing surface. By driving from the inner or outer diameter side, stress is concentrated at one end of the hole, and the divided load is lightly suppressed, creating a "dog-shaped" shape.
Method for enabling division, or Japanese Patent Application Laid-Open No. 55-63
As disclosed in No. 009, a figure-7 groove is formed in the axial direction on the raceway surface of a bearing ring, and a load is applied to this bearing ring to form a 7-shaped groove.
A method of dividing the raceway ring along the shape groove, or
No. 8-3771, continuous or discontinuous recesses are axially and non-linearly formed in the outer circumferential surface of a bearing ring, the bearing ring being smaller than the inner diameter of the bearing ring. A pressing jig that is mounted on a mandrel having an outer diameter so that the portion in which the recess is formed is placed on the fulcrum of the mandrel, and that has a pressing surface with a V-shaped or approximately ■-shaped cross section at the tip. is arranged so that the pressing surface straddles the recess in the circumferential direction, and the bearing ring is divided into two along the recess by applying pressure to the bearing ring with the pressing jig. There is a method for dividing a bearing ring, etc., which is characterized by the following.A specific example thereof is a method in which the recess in the axial direction consists of a narrow arc-shaped groove extending from the outer circumferential edge of one side to the outer circumferential edge of the other side. ”
``An axial recess is an arc-shaped thin groove formed in a meandering and discontinuous manner in the axial center of the outer circumferential surface of the bearing ring, and in the vicinity of the narrow groove and on both side edges of the outer circumferential surface. Proposals have been made such as "a recess consisting of a notch formed in a zigzag shape" or "a recess formed in a zigzag shape with only a notch".

[Problem that the invention seeks to solve]

Bearing rings manufactured by the above dividing method are
When assembling the housing, it is possible to effectively prevent misalignment in the axial direction by matching the unevenness of the irregular split fracture surfaces of each split ring. If the split shape deviates from the intended shape due to the notches or grooves on the outer circumferential surface that you prepared,
In some cases, there was a problem in that defective products also occurred.

This invention was made in view of such problems,
The purpose of this is to realize a method of dividing a bearing ring that can trace the intended and accurate divisional fracture shape, and to prevent misalignment when assembling the bearing ring.

[Means for solving problems]

That is, the present invention solves the above-mentioned problems, and the method for dividing the split bearing is to divide the outer peripheral surface of the bearing ring into a concave groove in the shape of a continuous substantially sine curve, and to form a groove at the top of the substantially sine curve. A process of forming in the axial direction a split part that is deep near the straight line part (the part that becomes the maximum or minimum in mathematics) and shallow near the vicinity of the inflection point, and the bearing ring The bearing ring is divided into two pieces along the sine curved dividing part by applying a blow to the dividing part.

[For production]

By striking the split portion of the bearing ring from above with a striking jig, the split portion can be easily divided into a pre-formed sine curve shape. In this case, the depth of the dividing part near the top of the sine curve is deep, and the part near the straight part is carved shallowly, so that it can be divided according to the intended curve shape, and the dividing curve is hardly deviated.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 (1) shows a bearing ring 1 before division according to the present invention.
2 is a front view, (2) is a right side view, and FIG. 2 is a sectional view taken along the line A-0-A in FIG. The outer peripheral surface 1 of this bearing ring 1
A is pre-processed with two split portions 2 in the form of sinusoidal concave grooves at approximately 180 degrees symmetrical positions in the circumferential direction, and a notch 3 is carved in one of the outer circumferential edges 1b, forming the sinusoidal curve. A shaped split portion 2 is carved so as to extend from the extension line of the notch 3 to the outer peripheral edge IC. These sinusoidal curved split portions 2, notches 3, etc. are formed by processing before heat treatment in the manufacturing process of the bearing ring 1. The bearing l is polished after heat treatment, and a predetermined gap 1d, which is not grooved, provided between one end of the split portion 2 and the notch 3 is for chucking during the polishing. It is something.

FIG. 3 is a sectional view taken along the line BB in FIG. 1 (2). As shown in this figure, the angle α between the cut surfaces 2a and 2b of the cross-sectional shape of the split portion 2 having a sine curve shape is approximately 60 degrees. 4(1) is a partial plan view of the split portion 2 of the bearing ring 1, and FIG. FIG. As shown in these figures, the depth of the groove in the split portion 2 is not made to have a --like depth, but is processed so that deep groove portions 2c, 2d and shallow groove portions 2e, 2f are formed. That is,
By cutting the sinusoidal curve so that the groove is deep near the top of the curve and relatively shallow near the straight portion, the groove is always cut into the intended dividing shape at the time of division.

Next, a method of dividing this bearing ring 1 will be explained. Fifth
The figure shows an embodiment in which the sine curved split portion 2 of the bearing ring 1 is divided, and FIG. 6 is a sectional view taken along the line X--X in FIG. 5. That is, the jig 4 is inserted into the inner diameter side of the bearing ring 1, and the jig 5 and the jig 6 are brought into contact with the jig 4 from both sides in the axial direction. Then, the sine curved split portions 2 carved on the outer peripheral surface 1a of the bearing ring 1 are placed above and below the jig 4.
The upper and lower surfaces 4A and 4B located in the groove 2 are cut flat to create spaces 21 and 22 on the inner diameter side where the split portion 2 is placed. In addition, the jigs 5 and 6 are fixed on the fixed base 23.2.
Fixed at 4.

If the split portions 2 of the bearing ring 1 set as described above are struck from above with the striking jig 7, the split portions 2, which are arranged 180 degrees symmetrically in the circumferential direction, will easily form the intended sine curve shape. It can be divided into.

In some cases, the striking jig 7 may simultaneously strike and divide the split portions 2.2 arranged 180 degrees symmetrically in the circumferential direction.

FIG. 7 shows each divided piece 11 divided by the method described above.
．． 12, each end face tta, llb, 12a, 1 of the divided piece 11.12 of the bearing ring l divided into two
2b is formed along the sinusoidal curved split portion 2. As shown in FIG. 8, each end face 11a, llb
, 12a, 12b have uneven fractured surfaces,
When the divided pieces 11, 12 are assembled again to form the bearing ring 1, it is almost impossible for the divided pieces to be assembled with any deviation in the axial direction.

In the above embodiment, the sinusoidal curved split portion 2 has two curved peaks in the axial direction.
The curve may be substantially sinusoidal, and the number of peaks of the curve may be further increased as shown in FIG. In this case, since the area near the top of the curve is more similar to a straight line than in the above-mentioned embodiment, it is easier to break accurately and smoothly at the time of division. This makes it possible to shorten the groove machining time.Furthermore, as shown in FIG.

(Effects of the Invention) Since the splitting method of the split bearing according to the present invention is configured as described in detail above, when the split bearing is assembled into a crankshaft or the like, the mating surfaces of the split pieces hardly shift in the axial direction. In addition, conventionally, an axial fixing device was required on the crankcase to prevent the split bearing ring from slipping, but this can be eliminated and assembly of the engine and the like becomes easier.

[Brief explanation of the drawing]

FIG. 1 (1) shows a bearing ring 1 before division according to the present invention.
, (2) is a right side view, Fig. 2 is a sectional view taken along the A-0-A arrow in Fig. 1 (1), and Fig. 3 is a BB-B in Fig. 1 (2).
4(1) is a partial plan view of the split portion of the bearing ring 1, and FIG. 4(2) is a sine curved split portion carved in the bearing ring l of FIG. 4(1). 2 is a cross-sectional view taken along the CDEF of FIG. Figure 7 is a perspective view of each divided piece divided by the method described above, Figure 8 is a perspective view of the divided bearing ring in a state in which each divided piece is combined, and Figure 9 is a sign of the split part of the divided bearing ring. Partial perspective view when the number of tops of the curve is increased, No. 10
The figure is a perspective view of another embodiment of the hitting jig used in the present invention. 1-m-split bearing ring 2-split part 3-notch4.
5.6.7...-Jig 11.12-Each segment of the segmented bearing ring

Claims (1)

[Claims] (1) On the outer peripheral surface of the bearing ring, a split part is formed in the axial direction, which is a concave groove in the shape of a continuous substantially sinusoidal curve, with the part of the substantially sinusoidal curve having a deep part near the top and a shallow part near the straight part. and a step of dividing the bearing ring into two divided pieces along the substantially sine curved dividing part by applying a blow to the dividing part of the bearing ring. Method.