JPH0242060Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a bearing device for a small motor.

[Conventional technology]

In a structure in which the armature shaft 6' of the motor is supported by a ball bearing 3', the ball bearing 3' is fitted into a bearing housing part 2' of a bracket 1' so as to be movable in the thrust direction, as shown in FIG. An annular wave-shaped wave washer 5' is interposed between the ball bearing 3' and the end surface 2a' of the bearing housing portion 2', and an annular flat wave washer 5' is interposed between the wave washer 5' and the ball bearing 3'. A washer 4' was arranged and assembled into the bearing housing part 2'.

[Problem that the invention attempts to solve]

In the bearing device as described above, when the ball bearing 3' is pressed in the thrust direction, the wave washer 5' deforms more than a predetermined amount between the annular flat washer 4' and the end surface 2a of the bearing housing portion 2' of the bracket 1'. will occur. Therefore, if the wave washer 5' is repeatedly deformed more than a predetermined amount by the thrust direction pressure of the ball bearing 3', and the number of deformations exceeds the limit number of times of the wave washer 5',
Problems such as cracks or damage have occurred.

[Means to solve the problem]

The present invention implements measures to prevent damage to the wave washer, and in view of the above problems, the armature shaft 6 of the motor is supported by a ball bearing 3, and the ball bearing 3 is thrust into the bearing housing part 2 of the bracket 1. In the motor bearing device, the wave washer 5 is fitted so as to be movable in a direction and has an annular wave-shaped wave washer 5 interposed between the ball bearing 3 and the end surface 2a of the bearing accommodating portion 2, the wave washer 5 and the ball bearing 3, an annular washer 4 having a protruding part 4b protruding from the flat part 4a toward the end surface 2a of the bearing accommodating part 2 is disposed between the flat part 4a of the annular washer 4 excluding the protruding part 4b and the The wave washer 5 is sandwiched between the end face 2a of the bearing accommodating portion 2 and the protruding portion 4b of the annular washer 4 is prevented from deforming the wave washer 5 by a predetermined amount or more due to the thrust direction pressure of the ball bearing 3.
is characterized in that it comes into contact with the end surface 2a of the bearing accommodating portion 2 and is regulated.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 1 is a bracket. 2 is a bearing accommodating portion provided in the bracket 1, and 2a is an end face of the bearing accommodating portion 2. 3 is a ball bearing. 4 is an annular washer, which is composed of a flat part 4a and a protruding part 4a. 5
is a ring-shaped wave washer,
It has an opening of 5a. 6 is an armature shaft.

Here, the bracket 1 is provided with a bearing accommodating portion 2 which is formed in a cylindrical shape with a bottom and protrudes outward.
It has an end surface 2a. A motor armature shaft 6 is press-fitted into the ball bearing 3. The annular washer 4 includes a flat portion 4a having the same diameter as the ball bearing 3, and a protruding portion 4b protruding from the center of the flat portion 4a. The wave washer 5 has an annular shape that can be elastically deformed, and has an opening 5a in the center.
It is formed to have the same diameter as the flat part 4a.

In the above-described components, first the wave washer 5 is disposed in the bearing accommodating portion 2 of the bracket 1, and then the annular washer 4 having the protruding portion 4b protruding from the flat portion 4a toward the end surface 2a of the bearing accommodating portion 2 is disposed. Then, the armature shaft 6 is fitted with the press-fitted ball bearing 3 so as to be movable in the thrust direction.

In the motor bearing device assembled as described above, the flat portion 4 of the annular washer 4 excluding the protruding portion 4b is pressed by the ball bearing 3 in the thrust direction.
Press the wave washer 5 with a. As a result, before the wave washer 5 deforms beyond a predetermined amount,
It is formed at the center of the flat part 4a of the annular washer 4,
A protrusion 4b formed to have a smaller diameter than the opening 5a of the wave washer 5 comes into contact with the end surface of the bracket 1 through the opening 5a.

[Effect]

The motor bearing device is assembled into the bearing accommodating portion 2 using the above-mentioned components as shown in FIG. 2, A. Furthermore, when the ball bearing 3 is pressed in the thrust direction, the wave washer 5 is crushed and deformed by the flat part 4a of the annular washer 4, as shown in FIG. The protruding portion 4b of the annular washer 4 comes into contact with the end surface 2a formed in the bearing accommodating portion to restrict the deformation of the wave washer 5 before the deformation exceeds a predetermined value.

〔effect〕

Even if the ball bearing 3 is repeatedly pressed in the thrust direction, the protruding part 4b of the annular washer 4 comes into contact with the end surface 2a of the bracket 1 to restrict the deformation of the wave washer 5 before the wave washer 5 is deformed beyond a predetermined value. This prevents the wave washer 5 from cracking or breaking, and maintains the elastic effect of the wave washer 5.

Furthermore, since the ball bearing 3 is constantly pressed in a certain direction, the durability of the ball bearing 3 is improved, and effects such as noise prevention can be improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a motor bearing device according to the present invention. FIGS. 2A and 2B are enlarged sectional views of a bearing device in which a wave washer, an annular washer, and a ball bearing are assembled in a bearing housing portion. FIG. 3 is an exploded perspective view of a conventional motor bearing device. 1', 1... Bracket, 2', 2... Bearing housing part, 2a', 2a... End face, 3', 3... Ball bearing, 4'... Annular flat washer, 4... Annular washer, 4a ...Plane part, 4b...Protrusion part,
5', 5... Wave washer, 5a... Opening,
6', 6...armature shaft.

Claims (1)

[Scope of utility model registration request] The armature shaft 6 of the motor is supported by a ball bearing 3, and the ball bearing 3 is fitted into the bearing housing part 2 of the bracket 1 so as to be movable in the thrust direction. In a motor bearing device in which an annular and wave-shaped wave washer 5 is interposed between the wave washer 5 and the ball bearing 3, there is provided a bearing device that protrudes from the flat portion 4a toward the end surface 2a of the bearing housing portion 2. An annular washer 4 having a protruding portion 4b is disposed, and the wave washer 5 is sandwiched between a flat portion 4a of the annular washer 4 excluding the protruding portion 4b and an end surface 2a of the bearing accommodating portion 2, and the ball bearing is The protruding portion 4b of the annular washer 4 deforms the wave washer 5 by a predetermined amount or more due to the thrust direction pressure of step 3.
A bearing device for a motor, characterized in that the bearing housing section 2 is regulated by coming into contact with an end surface 2a of the bearing accommodating portion 2.