JPH05118337A - Holder for roller bearing - Google Patents

Abstract

PURPOSE:To provide a tough structure which prevents a crack or the like from being easily generated while making a protrusion for preventing coming-off of a roller hardly interfere with the roller. CONSTITUTION:In a holder 1 formed in almost M-shape as viewed from a side surface, fine protrusions 4, 5 for preventing a roller from coming off are provided in pillar parts 3 by knurling work or die forming. The protrusion 4 for preventing the roller from coming off to an external diameter side is provided by each quantity in the external diameter side of a large diameter part in both ends in an axial direction of the pillar part 3, and the protrusion 5 for preventing the roller from coming off to an internal diameter side is provided by two in the internal diameter side of a small diameter part in the intermediate in the axial direction of the pillar part 3. The fine protrusions 4, 5 thus formed are prevented from easily interfering with a roller 6, to eliminate necessity for decreasing thickness of the pillar part 3 as before, and strength of this pillar part can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer peripheral guide type roller bearing retainer, and more particularly to a retainer used in a rotating portion of an internal combustion engine.

[0002]

2. Description of the Related Art In recent years, in internal combustion engines, roller bearings having rollers and cages, which do not have bearing rings, have come to be used at a connecting rod mounting portion for a crankshaft and the like.

As a cage for such a roller bearing, there is, for example, a so-called M-type cage as shown in FIGS. 6 and 7. In the figure, a half-type retainer is taken as an example. In the figure, 50 is a retainer, 51 is a pocket,
52 is a pillar portion, 53 is a projection for preventing the roller from slipping out to the outer diameter side,
54 is a projection for preventing the roller from slipping out toward the inner diameter side, and 55 is a roller. In this M-shaped cage 50, a pipe or the like is cut into a proper width, and the axial center portion of the outer peripheral surface thereof and the axial end portions of the inner peripheral surface thereof are respectively ground to have a substantially M-shaped cross section, and several circles are provided. It is obtained by punching out the roller storage pocket 51. The protrusions 53 and 54 are formed by punching for forming pockets.

The protrusion 53 for preventing the roller from slipping out to the outer diameter side is
One is provided at each axial end of the column portion 52, and one projection 54 is provided at the central portion of the column portion 52 in the axial direction to prevent the rollers from slipping out toward the inner diameter side.

[0005]

In the case of the conventional cage 50, it has been pointed out that the projections 53, 54 provided on the column portion 52 are likely to interfere with the rollers 55, and when they interfere, rotation of the rollers 55 occurs. In addition to inducing defects and skew, the lubricating oil on the peripheral surface of the roller 55 is easily scraped off, causing problems such as heat generation and seizure.

On the other hand, if the projections 53 and 54 are thinned by reducing the thickness of the column portion 52,
Although it becomes difficult to interfere with 3, 54 and 55, the occurrence of the above-mentioned trouble can be suppressed, but if such measures are taken, then the following trouble will occur.

That is, in the conventional cage, the protrusions 53,
Since the thickness of 54 is adjusted by increasing or decreasing the wall thickness dimension of the pillar portion 52, if the wall thickness of the pillar portion 52 is reduced as described above, when the pillar portion 52 and the portion 55 interfere with each other, the pillar portion 52
In the above, the strength becomes insufficient such that cracks are easily generated in the angular portions of the roots of the projections 53 and 54.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to have a tough structure in which it is difficult to interfere with the protrusions for preventing roller slippage and cracks are less likely to occur.

[0009]

In order to achieve such an object, the present invention has pockets for accommodating rollers at several circumferential positions, the outer peripheral surface of which is guided by the inner peripheral surface of a bearing mounting member. The cage for roller bearings has the following structure.

The roller bearing cage according to the present invention is provided with projections for preventing roller slippage due to knurling or die molding at both axial end portions on the outer diameter side of the circumferential end surfaces of the pillar portion between the pockets. At the same time, the strain generated by the knurling or molding is removed by the polishing treatment, and the outer circumference of the cage is made to be a substantially smooth surface.

[0011]

The protrusions for preventing roller slippage of the present invention are minute ones obtained by knurling or molding.
Since it is much smaller than the conventional one, this protrusion is less likely to interfere with the rollers, and since it is not necessary to reduce the wall thickness of the column part as in the past, it is possible to set the strength there sufficiently large. become.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 to 5 show an embodiment of the present invention. In this embodiment, a half-type cage is given as an example. In the figure, 1 is a cage, 2 is a pocket, 3 is a pillar portion between adjacent pockets 2, 4 is a projection for preventing the roller from slipping out to the outer diameter side, 5 is a projection for preventing the roller slipping out to the inner diameter side, 6 is around.

This cage 1 is referred to as an M-shaped cage formed in a substantially M shape when viewed from the side. Protrusion 4,
No. 5 is formed by knurling or molding, and the protrusion amount is set to be very small. One of the protrusions 4 is provided on the outer diameter side of the large diameter portion at both ends in the axial direction of the column portion 3, and the other protrusion 5 is provided on the inner diameter side of the axially intermediate small diameter portion of the column portion 3. Two are provided.

The protrusions 4 and 5 of the retainer 1 as described above are formed as follows. First, a plurality of pockets 2 are obtained by appropriately cutting a pipe or the like, and punching several circumferential portions thereof from the outside in the radial direction toward the inside using a punch / broaching jig. As shown in FIG. 4, two knurled shafts 7 and 8 are applied to the semi-finished cage 1 and pressed at a predetermined pressure, and the knurled shafts 7 and 8 are rotated. , The projections 4 and 5 on the large-diameter portions at both axial ends of the column portion 3 and the small-diameter portion in the middle in the axial direction.
To form. When this knurling is performed, the large diameter portion at both ends in the axial direction of the column portion 3 and the small diameter portion in the middle in the axial direction are formed into
As shown in (a) of FIG. 4, linear grooves 9 are formed so as to traverse the column portion 3 in the circumferential direction, and a ridge 10 is formed at the groove upper edge of each linear groove 9.

By the way, the cage 1 of the present embodiment is designed so that its outer circumference is guided by the inner circumferential surface of the mounting partner.
If there is a bulge 10 on the outer peripheral surface of the column portion 3, the guide surface of the mounting partner will be damaged, which is not preferable. In consideration of this, after the knurling, the outer peripheral surface of the cage 1 is roughly ground to remove the swelling 10,
Further, a smooth surface is obtained by performing carburizing and hardening treatment and finishing polishing [see (b) of FIG. 5]. Even if such a polishing process is performed, slight recesses are left at both ends in the circumferential direction of the column portion 3. However, since these recesses are located on the radially inner side of the maximum outer diameter portion of the column portion 3, the mounting partner can On the other hand, it does not need to be completely removed and smoothed because it becomes non-contact. In addition,
With respect to the linear concave groove 9 and the protrusion 10 formed on the inner peripheral surface of the column portion 3 of the cage 1, since the inner peripheral surface of the column portion 3 is not a guide surface, the removal as described above is performed in this embodiment. No processing is performed.

Therefore, in this embodiment, it is necessary to set the wall thickness of the column portion 3 to a large thickness in advance in consideration of the polishing size required to remove the strain which is a by-product of knurling.

The present invention is based on the above-mentioned M type cage 1.
However, the present invention is not limited to this, and can be implemented as a so-called gate-type holder.

[0019]

As described above, in the present invention, the protrusions for preventing the roller slip-out are made minute by knurling or die molding, so that the protrusions are less likely to interfere with each other. Almost no lubrication oil scraped off by the protrusions on the roller peripheral surface can be eliminated, which contributes to the improvement of rotation performance. Further, by adopting such a projection, the wall thickness of the column portion does not have to be made thin as in the conventional case, so that it is possible to set the strength there sufficiently and it becomes difficult for the interference described above. Due to the synergistic effect, damage such as cracks in the column can be prevented.

[Brief description of drawings]

FIG. 1 is a side view of a roller bearing cage according to an embodiment of the present invention.

2 is a rear view of the roller bearing cage of FIG. 1. FIG.

FIG. 3 is a vertical cross-sectional view showing how rollers are held by the roller bearing retainer of FIG. 1;

FIG. 4 is an explanatory view showing a method of forming protrusions of the roller bearing retainer of FIG. 1.

5 is a side view showing a process of forming protrusions of the roller bearing retainer of FIG. 1. FIG.

FIG. 6 is a side view of a conventional roller bearing retainer.

7 is a vertical cross-sectional view showing how rollers are held by the roller bearing cage of FIG.

[Explanation of symbols]

 1 Cage 2 Pocket 3 Pillar 4,5 Protrusion 6 Roller

Claims (1)

[Claims] 1. A roller bearing retainer having pockets for accommodating rollers at several circumferential positions, the outer peripheral surface of which is guided by the inner peripheral surface of a bearing mounting member, the peripheral portion of the pillar portion between the pockets. The protrusions on the outer diameter side of the both ends in the axial direction are provided on both axial ends to prevent the rollers from slipping out by knurling or molding, and the distortion caused by knurling or molding is removed by polishing processing and the cage outer circumference is removed. The cage for roller bearings is characterized by having a substantially smooth surface.