JPH0539214Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a bearing device used in a power seat motor for driving a reclining seat of an automobile.

BACKGROUND TECHNOLOGY In recent years, reclining seats in automobiles have been electrified and are being installed in cars for the general public.

An example of the conventional motor bearing structure described above will be described below with reference to the drawings.

FIG. 2 shows a conventional bearing device equipped with a thrust adjustment mechanism that absorbs backlash in the thrust direction of the rotating shaft. In FIG. 2, reference numeral 1 denotes a bottomed bearing housing that is formed integrally with a gear case (not shown). Reference numeral 2 denotes a cylindrical bearing that rotatably supports the axial end of the rotating shaft 3, and is installed in the bearing housing 1. 4 is a steel ball, rotating shaft 3
It is inserted into a steel ball hole 3a provided at the tip of the steel ball. Reference numerals 5 and 6 denote thrust plates, and a coil spring 7 and a thrust rubber 8 are installed between the thrust plates, and the thrust plate 5 is always biased in the direction of the rotating shaft.

The operation of the bearing and its mechanism configured as above will be explained below.

First, the rotating shaft 3 is supported by a bearing 2, and in order to reduce frictional resistance in contact between the rotating shaft 3 and the thrust plate 5, a steel ball 4 is inserted into a steel ball hole 3a of the rotating shaft 3. It is deployed. The steel ball 4 is coated with grease to provide lubrication between the steel ball hole 3a and the steel ball hole 3a. When the motor is assembled, the coil spring 7 is compressed, and the thrust plate 5 is always pressed in the direction of the steel balls 4 to prevent rattling in the thrust direction of the rotating shaft 3. Also,
When the rotating shaft 3 is not inserted into the bearing housing 1, the thrust abutment plate 5 is pressed against the end face of the bearing 2 by the coil spring 7, and there is no gap between the bearing 2 and the thrust abutment plate 5. It's summery.

Problems to be solved by the invention However, in the above configuration, the rotating shaft 3
Lubricating the sliding parts of the steel ball hole 3a and the steel ball 4 is as follows.
In the case of a power seat motor in which only a small amount of grease is applied to the surface of the steel ball 4 and the motor drive time is approximately 40 seconds per cycle, poor lubrication occurs due to grease leakage and deterioration, and the steel ball hole 3a portion This has caused problems such as abnormal wear and generation of abnormal noise.

In view of the above problems, the present invention is intended to retain lubricating oil without increasing the number of parts.

Means for Solving the Problems In order to solve the above problems, the present invention makes the outer periphery of the bearing end surface protrude in the axial direction, and connects the outer periphery of the bearing with a thrust abutment plate that comes in contact with the rotating shaft before insertion. A space is created in between to hold the lubricant, and
The shaft end face is disposed in this space so as to protrude.

Function The present invention has the above-mentioned configuration, so that even when the rotating shaft is not inserted into the bearing, a space is created between the bearing and the thrust plate in contact with it, and a lubricating oil such as grease is applied to this space. This makes it possible to prevent abnormal wear of the bearing and generation of abnormal noise.

Embodiment A bearing according to an embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a bearing housing, 2 is a bearing, 5 and 6 are thrust plates, 7 is a coil spring, and 8 is a bearing housing.
is a thrust rubber, and these configurations are the same as the conventional configuration. In this invention, as shown in the figure,
The outer periphery of one end surface of the bearing 2 is made to protrude in the axial direction,
A space 9 for storing lubricating oil is formed between the protrusion 2a and the thrust plate 5 that comes into contact with the rotating shaft (not shown) before insertion. Here, the coil spring 7,
Even if there is no thrust rubber 8 and thrust abutment plate 6, the thrust abutment plate 5 and the inner surface perpendicular to the axial direction of the bearing housing 1 are in contact with each other, and the thrust abutment plate 5 and the bearing 2 are in contact with each other. good.

As described above, according to this embodiment, by making the outer peripheral part of the bearing 2 protrude in the axial direction to provide the space 9, even if the thrust plate 5 is in contact with the rotating shaft 3 when it is not inserted. Lubricating oil such as grease can be sealed. In addition, in Figure 1,
Although the rotating shaft 3 and steel balls 4 are not shown, a structure similar to that shown in FIG. 2 is used.

Effects of the invention As mentioned above, this invention allows the outer circumference of the bearing to protrude in the axial direction and create a space, which makes it possible to hold more lubricating oil than before, which is effective in extending the bearing's life. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a bearing according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional bearing. 1... Bearing housing, 2... Bearing, 3... Rotating shaft, 5... Thrust contact plate, 7... Coil spring.

Claims (1)

[Scope of utility model registration request] a cylindrical bearing installed in a bearing housing and rotatably supporting a rotating shaft; a thrust abutment plate movably housed in the bearing housing and directly or indirectly abutting the tip of the rotating shaft; The thrust abutment plate is provided with a coil spring that constantly biases the thrust abutment plate in the direction of the rotating shaft, and the outer circumferential portion of the bearing end surface is made to protrude in the axial direction, and between this outer circumferential portion and the thrust abutment plate that is in contact with the rotating shaft before insertion. A bearing device in which a space for storing lubricating oil is provided in the bearing device, and an end face of the rotating shaft is disposed in the space.