JPH0648181Y2 - Synthetic resin cage for ball bearings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cage made of synthetic resin for ball bearings.

[Conventional technology]

The ball bearing is formed by incorporating, between an outer ring and an inner ring, a cage in which balls are circumferentially held at regular intervals. The functions required of such a retainer are that the balls can be held securely without falling off, that the moldability is good when molding with a mold, and that the precision after molding is excellent. Can be mentioned.

As a solution to such a problem, there is a cage proposed by the present applicant and described in Japanese Utility Model Laid-Open No. 62-4622.
In this cage, pocket forming portions whose inner peripheral surfaces are concave spherical pockets for holding balls are arranged in a row at a regular interval in a cylindrical shape, and the ball insertion openings of the pockets are opened in opposite directions. By opening the pockets in opposite directions, the flexibility in the circumferential direction is added, and the holding claws formed at both ends of the pocket are less likely to be deformed when forcedly removed during mold release. There is an advantage that molding accuracy can be obtained.

[Problems to be solved by the device]

By the way, when the load load is increased in the ball bearing, the thrust force and the moment load applied to the ball are increased, and the shoulder of the ball is easily ridden from the inner and outer rings. In order to prevent this, it is necessary to increase the shoulder height of the inner ring and the outer ring to prevent balls from falling off.However, if the shoulder height is increased, the distance between the inner ring and the outer ring becomes narrower and the balls are installed between the two rings. There is no choice but to reduce the radial wall thickness of the cage. When the radial thickness of the cage is reduced as described above, there is a problem that the balls easily fall off from the cage during the work of assembling the inner ring or the outer ring, which makes the work troublesome.

The present invention has been made in view of the above problems, and an object thereof is to provide a cage that can prevent balls from falling off even when the cage having the above-mentioned proposed structure is further improved to reduce the wall thickness. There is.

In order to solve the above-mentioned problems, the present invention has a structure in which pocket forming portions whose inner peripheral surfaces are concave spherical pockets for holding balls are arranged in a cylindrical shape at regular intervals via column portions and are formed continuously. In the cage made of synthetic resin for ball bearings, in which the ball insertion openings are opened to the inner diameter side and the outer diameter side of the cage and are inserted between the outer ring and the inner ring of the ball bearing to hold the balls in the pockets, A protrusion projecting from the pocket to the inner diameter side or the outer diameter side of the cage is formed on the pillar portion between the pockets, and a ball receiver in which the concave spherical surface of the pocket is extended is provided on this protrusion.

The second means of the present invention is, in the above configuration,
The protrusions provided between the adjacent pockets are connected by ribs that rise from the surface of the pillar.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 3 and FIG. 4, the cage 1 has a large number of pocket forming portions 3 whose inner peripheral surfaces are concave spherical pockets 2 for holding balls, which are arranged at regular intervals via pillar portions 6. Arranged in a cylinder,
The pocket 2 is formed by integrally molding these with a synthetic resin in a state where the ball insertion opening 4 is opened in opposite directions.

In the above cage 1, each pocket forming portion 3 has a substantially semi-cylindrical shape, and a pair of holding claws 5 for preventing balls from falling off are provided on both sides of the opening 4, and the adjacent pocket forming portions 3 are mutually connected by the pillar portions 6. And the openings 4 that are open in the axial direction of the cage 1 are arranged alternately in opposite directions.

A protrusion is formed on the inner diameter side of the column portion 6 so as to extend from the concave spherical inner peripheral surface 2a of the pocket 2.
Ball receivers 7, 7 for receiving the balls in the pocket from the inner diameter side are formed. The ball receivers 7, 7 are provided so as to face each other in a plane including the center of the ball held in each pocket 2, and the inner surface for receiving the ball has a concave spherical surface continuous with the inner peripheral surface 2a of the pocket 2. It is formed in a shape. Further, the adjacent ball receivers 7 are connected by the ribs 9. By providing the ribs 9 on the inner diameter surface of the column portion 6 in this way, the strength between the pocket forming portions 3 is increased and the cage 1 as a whole. Has the effect of improving strength.

The pockets 2 of the cage 1 do not necessarily need to be formed so that the openings 4 alternate, and even if only the openings 4 of at least one pocket 2 are opened on the side opposite to the other pockets, the holding It is possible to obtain the effect of preventing balls from falling out of the container.

The cage according to the present invention has the above-mentioned structure and is used in the state of the ball guide system for the angular ball bearing.

FIG. 1 and FIG. 2 show an example of use in a four-point contact ball bearing 12 using two inner rings 10 and 10 separated from each other.
The ball 8 is held in each pocket 2 and then the inner rings 10, 10 are assembled inside the cage 1. In the case of the above assembling work, the balls 8 are supported and held from below by the ball receivers 7 inside the pocket 2. For this reason, even if the thickness of the pocket forming portion in the radial direction is reduced, the balls 8 are effectively prevented from falling off due to the receiving of the ball receiver 7, and the assembling work can be performed without trouble.

In the above embodiment, a ball receiver is provided on the inner diameter side of the column portion,
The balls were prevented from falling off when the inner ring was installed in the cage attached to the outer ring.However, when the cage is attached to the inner ring and the two outer rings are attached to the cage, the outer diameter of the pillar is A ball receiver is provided on the side to prevent the balls from coming out.

[Effect of device]

As described above, according to the present invention, the column portion that holds the pocket forming portion is provided with the protrusion protruding toward the inner diameter side or the outer diameter side, and the balls are received by the ball receiver formed on this protrusion. The ball can be reliably prevented from coming out, and the ball retaining force is received by the strength of the column portion itself, so that the ball retaining force is maintained even when the thickness of the pocket is reduced. Therefore, the balls can be surely prevented from falling off, and the inner and outer races can be easily assembled.

When the projections are connected to each other by ribs as in the second means of the present invention, the strength between the pocket forming portions is increased, and the strength of the entire cage can be greatly improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a ball bearing using a cage according to the present invention, FIG. 2 is a partially cross-sectional front view of the same as above, FIG. 3 is a perspective view of the cage, and FIG. An enlarged plan view of
FIG. 5 is a perspective view of the main part of the above. 1 ... Cage, 2 ... pocket, 3 ... pocket forming part, 4 ... ball insertion opening, 7 ... ball receiver.

Claims (2)

[Scope of utility model registration request] 1. A pocket forming portion whose inner peripheral surface is a concave spherical pocket for holding balls is formed by arranging in a cylindrical shape at regular intervals via a column portion, and the ball inserting opening portion of this pocket is formed. In the cage made of synthetic resin for ball bearings, which is opened between the inner diameter side and the outer diameter side of the cage and is installed between the outer ring and the inner ring of the ball bearing to hold the balls in the pockets, in the pillar portion between the adjacent pockets. A cage made of synthetic resin for ball bearings, characterized in that a projection protruding from the pocket to the inner diameter side or the outer diameter side of the cage is formed, and a ball receiver in which the concave spherical surface of the pocket is extended is provided on this projection. . 2. A projection provided between the adjacent pockets,
The synthetic resin cage for ball bearings according to claim 1, wherein the cages are connected by ribs rising from the surface of the column portion.