JPH0662763U - Motor bracket structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding the bracket structure of an electric motor formed by aluminum die casting, after forming, fix a bush made of steel to the bearing part, cut the inside diameter of the bush, and fix the bearing It is an object of the present invention to provide a bracket structure for an electric motor. [Structure] The bottomed cylindrical bearing part of the bracket formed by aluminum die casting has a bottomed, substantially cylindrical shape with a taper with the open end widened according to the draft of the bearing part, and the rotating shaft at the bottom center Insert a hole to insert the bushing and a bush with a flange that extends from the bottom surface to a position that exceeds the depth of the bearing to form a flange, and fix it by shrink fitting or press fitting, and provide a gap between the flange and the mouth of the bearing. Due to
The bottom surface and side wall of the bearing portion and the bottom surface and side wall of the bush are brought into close contact with each other, and the bush is machined so that the inner diameter of the bush matches the outer ring of the bearing bearing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bracket structure of an electric motor, and more particularly to a structure of a bearing portion of the bracket.

[0002]

[Prior art]

 Conventionally, in a bracket 1 of an aluminum die cast electric motor, in order to fix a bearing ball bearing 7 to the bearing portion, a steel bush 6 is integrally cast into the bearing portion 2 as shown in FIG. 3, and die casting is performed. When the stator core fitting portion 8 of the bracket 1 is later cut, the inner surface of the bush 6 is simultaneously processed so as to be coaxial, and the outer ring of the bearing ball bearing 7 is press-fitted onto the inner surface of the bush 6. Has been. In this case, in the process of aluminum die casting, it is necessary to mount the steel bush 6 in the mold, and this work is performed when the mold temperature has dropped to a certain temperature, so the work efficiency is reduced. Not only is it causing problems, but there are also safety issues. Although the mounting work depends on the structure of the mold, automation is difficult and labor can not be saved, which is a bottleneck in the aluminum die casting process. There is also used a method in which the bearing portion 2 is machined directly into the bracket 1 to form a bearing housing without casting the steel bush 6 integrally, and the bearing ball bearing 7 is press-fitted and fixed. During operation as an electric motor, creep occurs between the bearing portion 2 and the outer ring of the bearing ball bearing 7, and the bearing portion 2 is abraded, resulting in noise and vibration.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above-mentioned conventional problems, and provides a bracket structure for an electric motor, which can hold a bearing ball bearing by attaching a steel bush to the bearing after aluminum die-casting of the bracket of the electric motor. It is intended to be provided.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the bearing portion of the bracket, which is formed in a cylindrical shape with a bottom by aluminum die casting, has a bottom and a substantially cylindrical shape with a taper that is expanded to the open end according to the draft of the bearing portion. A hole for inserting the rotary shaft in the center of the bottom surface and a steel bush with a flange extending from the bottom surface to the open end at a position that exceeds the depth of the bearing part are fixed by shrink fitting or press fitting. The bottom and side walls of the bush are in close contact with the bottom and side walls of the bearing, and there is a specified gap between the flange and the mouth of the bearing so that the inner wall of the steel bush fits the outer ring of the bearing ball bearing. Then, the bearing housing was formed by cutting.

[0005]

[Action]

 According to the above configuration, the bearing portion of the bracket has a substantially cylindrical shape having a bottom and a taper whose mouth is widened to match the draft of the bearing portion, and a hole through which the rotary shaft is inserted in the center of the bottom surface. Steel bush with a flange that expands to the outer periphery at a position beyond the depth of the bush is fixed by shrink fitting or press fitting, and the bottom and side walls of the bush are brought into close contact with the bottom and side walls of the bearing part, and the flange Between the bearing and the mouth of the bearing, and the inner diameter of the bush and the inner diameter of the stator core fitting portion of the bracket are cut coaxially, and the bush made of steel is used to form the outer ring of the bearing ball bearing. I tried to press.

[0006]

【Example】

 Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side cross-sectional view of an electric motor using the bracket structure of the present invention. The bearing portion 2 of the bracket 1 formed by aluminum die-casting into a bottomed substantially cylindrical shape has a bottomed surface with a draft of the bearing portion 2. In addition, it has a substantially cylindrical shape with a tapered mouth, and a hole 4 for inserting the rotating shaft 3 in the center of the bottom surface and a flange 5 extending to the outer periphery at the open end above the depth of the bearing 2 from the bottom. The steel bush 6 is press-fitted and fixed to the bottom surface and the side wall of the bearing portion 2 in close contact with each other, and a fixed gap is provided between the flange 5 and the mouth of the bearing portion 2. The outer ring of the bearing ball bearing 7 is press-fitted and fixed to the bush 6 in the same way as the inner diameter of the stator core fitting part 8 of the bracket according to the outer ring, and is fixed to the stator core fitting part 8 of the bracket 2. Stator core The rotor 10 is inserted through the outer periphery of the rotor core 10, the rotor 10 is inserted through the center of the inner periphery of the stator core 9, and the rotary shaft 3 is axially supported so as to be inserted through the bearing ball bearings 7 of the left and right brackets 2. Is rotatably held.

FIG. 2 is a side cross-sectional view of the bracket of the present invention. The bush 6 has a substantially cylindrical shape with a bottom and a taper that expands to the open side, and a flange 5 that expands outward is formed at the open end. The length from the bottom surface to the flange 5 is made slightly longer than the depth of the bearing portion 2 of the bracket 1, and when the bush 6 is press-fitted or shrink-fitted, the bush 6 is fitted to the bottom surface of the bearing portion 2 according to the draft of the bearing portion 2. Also, the bush 6 is inserted so as to be in close contact with the side surface, and a certain gap is provided between the mouth of the bearing 2 and the flange 5 so that the bush 6 is securely fixed. In this state, if the inner diameter of the bush 6 is machined so as to be coaxial with the stator core fitting portion 8 of the bracket 1 in accordance with the outer ring of the bearing ball bearing 7, the mechanical rigidity of the bush 6 is increased by the flange 5. The eccentricity of the stator core 9 and the rotor 10 can be reduced during cutting. Further, when the inner diameter of the bush 6 is machined, the work oil that flows out is blocked by the flange 5, so that the work oil can be prevented from entering between the bush 6 and the bracket 1.

[0008]

[Effect of device]

 As described above, in the present invention, after the aluminum die-casting of the bracket, the flange that has a taper according to the draft of the bearing portion of the bracket and expands outward at the open end at a position exceeding the depth of the bearing portion. 5 is formed so that a fixed gap is provided between the open end of the bush 6 of the bearing part and the flange 5, and a substantially cylindrical steel bush is fixed to the bearing part by shrink fitting or press fitting. By cutting the bearing to match the outer ring of the bearing ball bearing, the work of fixing the bush to the die during aluminum die casting can be omitted, and the workability of the aluminum die casting can be improved. In addition, the flange of the bush prevents the intrusion of the machining oil when machining the inner diameter of the bush and prevents accidents such as corrosion due to the machine oil.

[Brief description of drawings]

FIG. 1 is a side sectional view of an electric motor using a bracket structure of the present invention.

FIG. 2 is a side sectional view of the bracket of the present invention.

FIG. 3 is a side sectional view of a conventional bracket.

[Explanation of symbols]

 1 Bracket 2 Bearing part 3 Rotating shaft 4 Hole 5 Flange 6 Bushing 7 Bearing ball bearing 8 Stator core fitting part 9 Stator core 10 Rotor

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Yuuji Kawai, 1116 Suenaga, Takatsu-ku, Kawasaki City, Fujitsu General Limited (72) Yuuji Soma 1116, Suinacho, Takatsu-ku, Kawasaki City, Fujitsu General

Claims (1)

[Scope of utility model registration request] 1. A bearing portion of a bracket, which is formed into a cylindrical shape with a bottom by aluminum die casting, has a bottom, a substantially cylindrical shape having a taper which is widened to the open end according to the draft of the bearing portion, and rotates in the center of the bottom surface. A shaft made of steel and a steel bush with a flange that extends from the bottom surface to the open end at a position that exceeds the depth of the bearing part and expands to the outer periphery are fixed by shrink fitting or press fitting. While closely contacting the side wall with the bottom surface and the side wall of the bearing part, a predetermined gap is provided between the flange and the mouth of the bearing part, and the inner wall of the steel bush is cut to match the outer ring of the bearing ball bearing, A bracket structure for an electric motor, characterized in that a bearing housing is formed.