JPS5835860Y2 - Cage for sealed radial ball bearings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a cage for a radial ball bearing in which a seal is integrally formed.

Conventionally, this type of cage is made of synthetic resin and has an annular part,
It is made up of a pillar section extending in a comb shape in the axial direction, and the annular section is provided with a collar that extends inward and outward in the radial direction, and this collar is opposed to the stepped sections provided at the ends of the outer diameter surface of the inner ring and the inner diameter surface of the outer ring. There is a rolling element guide type that allows the ball to act and also has a lip on the open end of the column that holds the ball to prevent it from coming out in the axial direction, or a type that has a marking on the inner diameter surface of the column to prevent the inner ring from slipping out. There was a track guide type that engaged with the raceway groove to prevent the retainer from falling off.

However, with the former, it is troublesome to mold the part that holds the ball, and
The axial and radial clearances between the collar and the inner and outer rings tend to change, causing problems with sealing effectiveness.

In addition, in the latter case, when the cage moves in the radial direction and, for example, the protrusion of the cage comes off from the raceway groove of the lower inner ring, the cage is engaged only with the protrusion that engages with the upper raceway groove, and the cage is removed. The tilting caused the gap 1 to change, impairing the sealing effect, and sometimes causing the retainer to fall off.

This was especially serious when the orbit depth was small.

This idea eliminates the drawbacks of the conventional method by providing protrusions on both the inner and outer surfaces of the column in the radial direction and simultaneously engaging the raceway grooves of the inner and outer rings, thereby preventing the retainer from falling off and keeping the clearance 1 constant. The invention relates to a cage with a sealed seal.

Next, an embodiment of this invention will be described with reference to the drawings. The retainer is made of elastic synthetic resin, and the annular portion 1 also has a large number of columnar portions 2 extending in the axial direction in a comb shape.

The annular portion 1 is formed with a flange 3 extending radially inward and outward, and both ends of the flange are stepped portions 6 as seal grooves provided at the ends of the outer diameter surface 5 of the inner ring 4. and a step 9 as a sealing groove provided at the end of the inner diameter surface 8 of the outer ring I, and are in contact with or in close proximity to these steps to provide a sealing effect.

Protrusions 10.11 each having a circular cross section and protruding in the radial direction are provided on the inner diameter surface and the outer diameter surface of the columnar portion 2, and are recessed into the raceway groove 12 of the inner ring 4 and the raceway groove 13 of the outer ring T, respectively.

The column 2 is also provided with an axial cut 14,
This cutout 14 opens at the free end of the column and separates the column into inner and outer portions in the radial direction.

15 is a ball. To assemble a radial ball bearing using this cage, after inserting the required number of balls between the raceway grooves 12 and 13 of the inner and outer rings, the cage is pushed into the gap between the inner and outer rings along with the pillars.

Then, since the column is provided with a cutout 14, the protrusion 10
．． 11 comes into contact with the outer diameter surface 5 of the inner ring and the inner diameter surface 8 of the outer ring, they are pushed and bent, approach each other, and pass through the narrow gap between the outer diameter surface 5 and the inner diameter surface 80.

The retainer is further pushed in so that the protrusions 10° and 11 become the raceway grooves 12.
When it reaches point 13, it returns to its original shape due to elasticity and becomes the first
The state shown in the figure is reached, and they are inserted into and engaged with the raceway grooves 12 and 13, respectively.

As mentioned above, this idea is based on the fact that the pillars of the cage have internal and external protrusions.
, 1i engages with the raceway grooves of both the inner and outer rings, so even if the retainer and bearing are eccentric and some of the protrusions come off the raceway grooves, the retainer will remain in contact with the raceway grooves around the entire circumference. Since both are engaged with either the inner or outer raceway groove and are both track guides, there is an axial clearance of 116 between the collar and the outer ring or inner ring.
And the radial clearance 117 can always be kept constant.

In addition, since it is a dual-track guide, unlike the conventional bearing that is recessed into only one raceway groove, even a bearing with a small track depth can be reliably assembled, and there is no risk of it falling off.

Moreover, since the column part is provided with an axial cut 14, the distance between the protrusions 10 and 11 changes elastically, so assembly is not easy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of this invention, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1...Annular part, 2...Column part, 3...
...Brim, 4...Inner ring, 5...Outer diameter surface, 6...Step, I...Outer ring, 8...
...Inner diameter surface, 9...Stepped portion, 10...
...Protrusion, 11...Protrusion, 12... Raceway groove, 13... Raceway groove, 14... Cut 9°

Claims (1)

[Scope of utility model registration request] It has an annular part made of elastic synthetic resin and a number of pillars extending in the axial direction from the annular part in a comb shape. The column is provided with a collar that extends radially inward and outward, and the column is provided with protrusions that protrude from the inner and outer surfaces to fit into the raceway grooves of the inner and outer rings. A cage for radial ball bearings with a seal, which has an axial cut that separates the inside and outside.