JPS59153433A - Bearing base of motor - Google Patents

Abstract

PURPOSE:To rigidly hold a bearing by projecting the outer peripheral corner of the recess hole end in which the bearing is press-fitted, and forming the inner peripheral corner of the hole end substantially in the same plane as the inner peripheral wall of the recess. CONSTITUTION:A bearing base 5 is formed of a metal plate material, a bottomed cylindrical recess 7 for press-fitting a bearing is formed by throttling at the center, and a brush holder 8 made of synthetic resin is mounted on the outer periphery. The recess 7 is projected at the outer peripheral corners 9a-9d of the hole end, and formed so that the inner peripheral corners 10a... of the hole end become substantially the same plane as the inner peripheral wall 7a of the recess 7. The press-fitting force is increased by increasing the contacting area of the recess 7 with the shaft to be press-fitted to the recess.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a bearing stand for a motor in which a bearing for supporting an i4 rotating shaft is press-fitted into a recess and held.

- Generally speaking, a bearing stand made of synthetic resin is often used, but since the bearing stand is weak in strength, it is necessary to form the bearing stand with a thickness of 4 mm, so the motor is There is a problem with the large size.

Therefore, in order to make the bearing pedestal thin and strong, the bearing pedestal 5 is made of metal plate material as shown in FIG.
There is an example in which the recess 7 for press-fitting and holding the bearing is formed by drawing, but it is necessary to form the recess 7 at the open end of the recess 7 (A in Fig. 1). part) sag to become an R surface, and the part that contacts and holds the bearing (1 in Figure 1)
There was a problem that the bearing press-fit retention force became smaller and the bearing became uncomfortable or came off.

For example, as a method for preventing sagging due to the drawing process, there is an example as shown in Japanese Patent Application Laid-Open No. 54-25406. That is, as shown in FIG. 2, a plurality of cut and raised pieces 15 are solidly formed on the bearing stand 5 made of a metal plate material, and the cut and raised pieces 15 completely form the recess 7 for holding the bearing.

However, since the cut and raised pieces 15 are supported on a cantilever, the strength is weak and the holding force of the bearing is small.Due to the dimensional variation of each cut and raised piece 15, the centering degree of the bearing is poor, and furthermore, the bearing stand 5 Since the opening 16 is formed in the motor, there is a problem in that dust can enter the motor.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a bearing stand for a motor that can downsize the motor and firmly hold the bearing.

Hereinafter, embodiments of the present invention will be explained based on FIGS. 1j7J of the drawings. 1i71' A cylindrical motor case with an open end and a bottom, with a synthetic resin bearing holder 2 on the bottom wall.
(7 to hold the shaft/VB, and a cylindrical magnet 1 to the inner periphery of the peripheral wall 4, and open 1 to the gauge 1)
In the example, a bearing stand 5 is attached. The bearing stand 5 is made of a metal plate material.The central part is drawn to form a bottomed cylindrical recess 7 in which the bearing 6 is press-fitted and held, and a brush holding part made of synthetic resin is formed on the outer periphery of the recess 7. Plate 8 is attached. As shown in FIGS. 4 to 6, the recess 7 is formed by protruding the outer corner portions 9a to 9 (indicated by +) of the outer corner portions of the inner corner portions of the open “one end.” ] Oa to lOd are formed so as to meet the inner circumferential wall !f!-17a of the recess 7 and the road surface, and the bearing 6 press-fitted into the recess 7 is press-fitted by increasing the contact crest by 1. A rotor 12 equipped with a commutator 11 is disposed in the motor case 1, and the rotor 12/(7) rotating shaft 13 is connected to the pair of bearings 8. The brush 14 is rotatably supported between the commutator 1 and the commutator 1.

In addition, on the inner circumferential corner of the opening end of the recess in the above embodiment,
In order to make it easier to press fit the receiver, four areas are formed locally that are flush with the inner circumferential wall of the recess, but the same effect can be obtained even if they are formed all around the inner circumferential corner. It can be achieved.

As described above, in a motor bearing stand made of wood, in which a recess into which a bearing supporting the rotating shaft of the motor is press-fitted and held is formed by drawing a metal plate, the opening end of the curved recess is The outer peripheral corner was protruded and formed so that the inner peripheral corner of the opening end of the recess was approximately [nl-] with the inner peripheral wall of the recess, so that the inner peripheral wall of the bearing pedestal and the bearing 7, the bearing base is thinner and the bearing can be held more firmly, and the motor can therefore be made more compact. Unfortunately, unlike the conventional example, no openings are formed in the bearing base, which prevents dust, etc. There is no intrusion into the motor, and a motor with fewer failures can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a conventional example, FIG. 2 is a perspective view of another conventional example, FIG. 8 is a cross-sectional view of a motor employing a bearing stand according to an embodiment of the present invention, and FIG. Top view showing the embodiment, No. 5
The figure is a sectional view taken along line BB in FIG. 4, and FIG. 6 is a main bottom view of the embodiment of the present invention. 5... Bearing stand, 6... Bearing, 7... Recess, [3.
··Axis of rotation. Patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Scope of Claims] I) - A recess in which a bearing supporting the rotating shaft of the Tanabata is press-fitted and held is formed by drawing a metal plate or material. At the pedestal U, protrude the outer corner of the open end of the r4iJ corner so that the inner corner of the open end of the recess is aligned with the inner wall of the recess 151r and the road surface. The motor bearing pedestal must have molded. 2) Extrude the outer periphery corner of the open end of the recess in multiple places.
[Claims characterized by the following features] ((A bearing stand for a motor according to claim 1.