JPH10292820A - Cage for bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize low torque and low torque fluctuation and make sealing by an automatic machine possible by providing a grease reservoir on the back face side of a cage. SOLUTION: A plurality of grease reservoirs 4d are concavely provided in a longitudinal side face view inverse L-shape at equal intervals on the back face inside diameter side 4b of a back face 4a. This cage is made to have a cage structure in which grease 5 is filled in the grease reservoir 4 and grease scattered is made to be prevented from entering an outer race groove, even when grease scatters by being affected by centrifugal force. At a back face 4a location opposed to the base part side of each pillar part 4e, the grease reservoirs 4d are provided. The grease reservoirs 4d may be provided for every back face 4a location opposed to the base part side for every plural pillar part 4e, without being limited, or may be provided at the back face location opposed to a ball bearing part 4f. The concavely provided portions can be selected according to the proper circumferences. The grease reservoirs 4d are concavely provided all over the areas of the circumferential direction of the back face 4a of the cage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor, and more particularly to a bearing retainer used for a scanner motor for a polygon mirror of a laser beam printer.

[0002]

2. Description of the Related Art As a conventional grease-filled form of a bearing cage, a bearing mounted sealing is known (see FIG. 5).

[0003]

However, grease 200
In such a sealed form in which the grease 200 is scattered under the influence of centrifugal force, the scattered grease 200 enters the outer ring groove 300, thereby increasing the torque and causing torque fluctuation. There was a fear that.

Further, with the recent increase in the speed of the motor, even if the method of sealing grease or the shape between the claws of the retainer is improved, the inconvenience that grease cannot be completely suppressed has arisen. . The inventor of the present application has conducted intensive studies on the premise that grease is scattered, and as a result, has succeeded in improving a bearing retainer capable of effectively solving the problems of the conventional technology.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a bearing retainer in which scattering of grease does not affect torque fluctuation. That is.

[0006]

A technical solution of the present invention to solve the above-mentioned problem is to provide a grease reservoir on the back side of the retainer.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bearing retainer according to an embodiment of the present invention. 1 and 2 show a first embodiment of a bearing retainer of the present invention used for a rolling ball bearing, FIGS. 3 and 4.
Shows a second embodiment. In the drawing, 1 is an outer ring, 2 is an inner ring, 3 is a rolling element (ball), 4 is a retainer, and 6 is a sealing plate. In the present embodiment, the outer ring 1, the inner ring 2, the rolling elements 3, and the sealing plate 6
Since well-known structures can be applied within the scope of the present invention, the description thereof is omitted in this specification.

[0008] The retainer 4 of the first embodiment shown in FIGS.
Is formed by recessing a plurality of grease reservoirs 4d at regular intervals on the inner diameter side 4b of the back surface 4a in a substantially inverted L-shape when viewed from the vertical side (seven in the circumferential direction in this embodiment). Further, the shape of the recess is not limited at all and is arbitrary.

Therefore, according to the present embodiment, the rear inner diameter side 4
b is recessed in the grease reservoir 4d.
The grease 5 is sealed in the cage structure. Even if the grease scatters under the influence of centrifugal force, the scattered grease does not enter the outer ring groove, so that low torque and low torque fluctuation can be realized. .

Next, a second embodiment of the bearing retainer 4 of the present invention shown in FIGS. 3 and 4 will be described. The retainer 4 of this embodiment comprises a plurality of retainers 4 on the outer diameter side 4c of the back surface 4a at equal intervals. The grease reservoirs 4d are recessed in a rectangular shape when viewed from the vertical side (seven places in the circumferential direction in this embodiment). Further, the shape of the recess is not limited at all and is arbitrary.

In each of the first and second embodiments, a grease reservoir 4d is provided at a position of a back surface 4a facing the base side of each pillar 4e. However, the present invention is not limited to this. For example, it may be provided at each rear surface 4a position facing the base side of each of the plurality of pillar portions 4e..., Or may be provided at the rear surface position facing the ball receiving portions 4f. The recessed portion can be appropriately selected according to the situation or the like.

The grease reservoir 4d is provided on the back surface 4 of the cage.
The recess a may be provided over the entire area in the circumferential direction of a.

[0013]

Since the present invention has the above-described structure, if the bearing incorporates the bearing retainer of the present invention,
Even if grease is scattered under the influence of centrifugal force, since the scattered grease does not enter the outer ring groove,
Low torque and low torque fluctuation were realized. Further, the bearing retainer of the present invention has an advantage that it can be sealed by an automatic machine.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an assembled state of a first embodiment of the retainer of the present invention in which a grease reservoir is provided on the inner diameter side on the back side.

FIG. 2 is a rear view of the retainer according to the first embodiment.

FIG. 3 is a vertical sectional side view showing an assembled state of a second embodiment of the retainer of the present invention in which a grease reservoir is provided on the outer diameter side on the back side.

FIG. 4 is a rear view of the retainer according to the second embodiment.

FIG. 5 is a longitudinal side view showing a state of grease filling according to the related art.

[Explanation of symbols]

 1: Outer ring 2: Inner ring 3: Rolling element 4: Cage 4a: Back surface 4b: Inside diameter side 4c: Outside diameter side 4d: Grease pool 5: Grease

Claims (1)

[Claims] 1. A bearing retainer having a grease reservoir on the back side.