JPH0627526B2 - Roller bearings for engines - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing having a cage, and more specifically to a roller bearing used for a large end portion of a connecting rod for a small engine. .

2. Description of the Related Art Bearings used for connecting rods of small engines used in motorcycles and the like are often roller bearings with cages because of their features of small sectional height and large load capacity.

This engine bearing must always satisfy the contradictory conditions of an increase in load capacity and an increase in rigidity of the cage. C. D.
It must be installed on the (pitch circle diameter) and the rigidity of the cage must be increased. As one of the solutions, the applicant has proposed Japanese Utility Model Application No. 51-33608.

In the method using a cage, the present invention can incorporate the largest number of rollers. However, the rollers are prevented from falling toward the cage inner diameter side by projecting the inner diameter surface of the annular portion inward. That is, a part of both ends of the pocket is projected to prevent the rollers from falling toward the inner diameter side.

Problems to be Solved by the Invention The above-mentioned protrusion processing is technically difficult because it is performed while rotating the relatively narrow annular portion, and the processing man-hour increases,
It was difficult to obtain accuracy.

As mentioned above, conventional bearings are
The roller bearing had the largest load capacity and did not allow the rollers to fall out.However, the roller holding inside the cage was unstable, and there was the problem that the rollers could fall out of the cage during transportation. Due to the increase in processing man-hours, it could not be manufactured at low cost.

Therefore, it has been a problem to provide a bearing that solves the above-mentioned various drawbacks.

Means for Solving the Problems The present invention has the following configurations as means for solving the above problems.

That is, it has an annular portion on both sides, and has a plurality of pillar portions that connect the both annular portions in parallel to each other in the axial direction, and pockets for a plurality of rollers that are slightly larger than the rollers and the annular portion. Roller engine with cage, which is formed substantially parallel to the column direction in the axial direction and has a cage having a substantially hollow cylindrical shape and thinner than the roller diameter, and a plurality of rollers respectively inserted into the pockets. In the roller bearing for use, there is no step on the outer peripheral surface of the cage, and the central portion of the inner peripheral surface of the cage reaches the outside of the pitch circle diameter of the roller and has a width substantially shorter than the length of the pocket. A U-shaped recessed groove is formed, a thin pillar central portion corresponding to the concave groove and end portions of thick pillars at both ends thereof are formed in the pillar portion, and the thin pillar central portion is formed. A part of both sides of the roller is projected in the circumferential direction to prevent the rollers from escaping to the outside. A holding protrusion is formed, and the end of the thick-walled column is formed to have a plate thickness substantially the same as the annular portion, and a part of the inner peripheral surface is formed at the end of the thick-walled column. The above-mentioned problems can be solved by an engine roller bearing having a structure in which an inner holding protrusion that is protruded in the circumferential direction by caulking to prevent the roller from coming inward is formed.

Function The present invention makes the plate thickness of both ends of the cage column the same as that of the annular portion to enhance the rigidity of the cage and reliably guide the rollers,
Further, a part of the inner peripheral surface of the end portion of the pillar is projected into the pocket by caulking to form an inner holding protruding portion, which securely holds the roller, and a large concave groove is formed in the central portion of the cage. Since it is configured to reduce the weight of the cage by forming it on the inner peripheral surface of the roller bearing, the load capacity of the roller bearing is increased to extend the life of the roller bearing, and the roller bearing is easy to handle. Can be easy.

Embodiments The constitution of the present invention will be described with reference to the embodiments shown in FIGS. 1 to 4.

FIG. 1 is a perspective view of the entire bearing showing an embodiment of the present invention, and FIG.
The drawing is a partial cross-sectional view taken along a plane perpendicular to the axis in the center of the cage, FIG. 3 is a partial cross-sectional view of the axial center, and FIG.

The cage 1 has a substantially hollow cylindrical shape, and a plurality of pockets 3 for the rollers 2 and 2 parallel to the axis are provided on the outer peripheral surface 1 of the cage.
From 0 to the inner peripheral surface 9, the width and length of the roller 2 are slightly larger than those of the roller 2. No irregularities such as steps are seen on the outer peripheral surface other than the pockets 3. Between the adjacent pockets 3 and 3, the column portion 1a is formed in a trapezoidal cross section having the widest width on the outer peripheral surface 10 and the narrow width on the axial center side.
In the outer peripheral surface shape of the column portion 1a and the annular portion 1b, in the bearing for the large end portion of the connecting rod, the outer peripheral surface 10 receives the centrifugal force acting on the cage, and the surface pressure on the outer peripheral surface 10 of the cage 1 is Ensure a wide contact surface to lower.

Furthermore, in the central portion in the length direction of the pocket 3 of the cage 1,
A part of the column portion 1a projects into the pocket 3 to form an outer holding projection 3a, and as shown in FIG. 2, the dimension between the pair of outer holding projections 3a in the circumferential direction is equal to that of the roller. Two
The diameter of the roller 2 is slightly smaller than the diameter of the roller 2 to prevent the roller 2 from falling out.

FIG. 3 is a partial cross-sectional view in which the center of the pocket 3 in the width direction is cut in the axial direction, and FIG. 4 is a partial inner view of the pocket 3 seen from the axial center side.

The cage 1 is composed of two annular portions 1b and a column portion 1a for axially coupling the rollers and forming a pocket 3.

The guide surface 3 on the side surface of the radial thickness 2 of the annular portion 1b
Since the plate thickness of the end portions 5 at both ends of the column portion 1a forming the c is formed to be the same, the shape of the inner peripheral surface 8 of the cage 1 is simplified, so that the inner peripheral surface 8 of the cage 1 is formed. And the cage 1 can be manufactured at low cost, the rigidity of the column portion 1a as a beam is improved, and the inner holding protrusions 3b and 3b can be easily caulked. The amount of protrusion of the retaining protrusion 3b is stable, and the roller 2 can be reliably retained. Since the crimping process has high mass productivity, the roller bearing can be manufactured at low cost.

In the processing of the cage 1, a steel material is roughly formed into a substantially hollow cylindrical shape by turning, and the outer holding protrusion 3a is processed at the same time when the pocket 3 is formed. After that, the inner holding protrusion 3b is formed by caulking, and after heat treatment, grinding, and finishing are performed, surface treatment (for example, copper plating or silver plating) is performed as necessary to improve wear resistance. Let

FIG. 2 is a partial cross-sectional view in the center of the side surface of the cage 1. In order to clearly show the positional relationship between the roller 2 and the cage 1, the two-dot chain line shows the shaft 6 and the housing 7 into which the roller bearing is fitted. In a use state in which the roller bearing is fitted in the shaft 6 and the hole of the housing 7, the roller 2 is a guide surface 3c forming both side surfaces of an end portion 5 of a column formed at both axial end portions of the pocket 3.
3c and the end surface 3d, which is the inner surface in the axial direction of the annular portion 1b, are brought into contact with each other, and the P. C. D. It is guided above and is dimensioned so as not to come into contact with the outer and inner holding projections 3a and 3b, and the raceway surface 9 of the housing 7 before the inner peripheral surface 8 of the cage 1 and the shaft 6 come into contact with each other. The outer peripheral surface 10 of the cage 1 is dimensioned (outer slide).

In the illustrated embodiment of the present invention, the outer retaining projections 3a of the pocket 3 are formed at two locations in the axial direction. However, when the bearing is small, the outer retaining projections 3a are increased in axial length. It may be formed in only one place.

Further, in the illustrated embodiment, the caulking groove 1 is formed on the cylindrical inner peripheral surface 8.
Although the inner holding protrusion 3b is formed by forming d, a chevron-shaped protrusion is provided around a part of the inner peripheral surface 8 of the end portions 5 and 5 at both ends of the column portion 1a, and this is caulked to hold the inner portion. The projecting portion 3b may be formed.

Effects of the Invention The present invention has the following effects.

1) Since the end portion of the pillar having a large thickness is formed, the rigidity of the pillar portion is improved, the roller can be stably guided, and the skew of the roller is reduced.

2) Since the annular portion and the end portion of the column have the same thickness and the axial sectional shape of the cage is simplified, the cage can be manufactured inexpensively and accurately.

3) Since the inner holding protrusion can be accurately formed at the end of the thick column, the roller can be held reliably.

4) Since the recessed groove can be formed large, the weight of the bearing can be reduced.

5) Therefore, the bearing life can be extended.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a schematic perspective view of the entire bearing, FIG. 2 is a partial sectional view taken along a plane orthogonal to the axial center at the center of the cage, and FIG. 3 is a partially reduced cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is a partially reduced inner side view in the direction of arrow B in FIG. 1: Cage, 1a: Column part, 1b: Annular part, 1c: Recessed groove, 2: Roller, 3: Pocket, 3a: Outer holding protrusion, 3b: Inner holding protrusion, 4: Central part, 5: edge,
8: inner peripheral surface, 10: outer peripheral surface.

Claims (1)

[Claims] 1. A roller for a plurality of rollers having annular portions on both sides and a plurality of pillar portions connecting the annular portions in parallel to each other in the axial direction, the diameter being slightly larger than the diameter and length of the roller. Retainer comprising a cage having a substantially hollow cylindrical shape in which the pocket is formed between the annular portion and the column portion in parallel to the axial direction and having a wall thickness smaller than the roller diameter, and a plurality of rollers each inserted into the pocket. In the engine roller bearing of the roller with a roller, there is no step on the outer peripheral surface of the cage, and the central portion of the inner peripheral surface of the cage reaches the outside of the pitch circle diameter of the roller and the length of the pocket. A substantially U-shaped recessed groove having a short width is formed, and a thin pillar central portion corresponding to the recessed groove and end portions of thick pillars at both ends thereof are formed in the pillar portion. A part of both sides of the central part of the thin-walled column is projected in the circumferential direction to remove the roller from the outside. An outer holding protrusion for preventing the above-mentioned problem, and the end of the thick-walled column is formed to have substantially the same plate thickness as the annular portion, and the end of the thick-walled column has an inner peripheral surface. A roller bearing for an engine, characterized in that a part thereof is circumferentially projected by caulking to form an inner holding projection for preventing the roller from coming out inward.