JPH0662764U - Motor bracket structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding the bracket structure of the electric motor formed by aluminum die casting, after the aluminum die casting, the steel bush is fixed to the bearing part, the bush is cut, and the bearing is fixed. It is an object of the present invention to provide a bracket structure for an electric motor. [Structure] A bottomed cylindrical bearing part molded by aluminum die casting, with a bottomed cylindrical hole for inserting the rotary shaft in the center of the bottom surface, and an outer periphery at the opening end above the depth of the bearing part from the bottom surface. Bushing with a flange that expands to is fixed by shrink fitting or press fitting so that the bottom part of the bushing comes into close contact with the bottom surface of the bearing part, and the inner diameter of the bushing is cut according to the outer ring of the bearing bearing. Characterize.

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 cut later, at the same time, the inner surface of the bush 6 is cut so as to be coaxial with the outer ring of the bearing ball bearing 7, and the inner surface of the bush 6 is bearing ball bearing. The method of press-fitting the outer ring of No. 7 is usually taken. In this case, it is necessary to mount the steel bush 6 in the die during the aluminum die casting process, and this work is performed when the temperature of the die has dropped to a certain temperature, resulting in a decrease in work efficiency. Not only is there a safety problem. 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 a method in which the bearing 2 is machined directly into the bracket 1 and the bearing ball bearing 7 is press-fitted and fixed, without casting the steel bush 6 in one piece. However, creep occurs between the bearing portion 2 and the outer ring of the bearing ball bearing 7, and the bearing portion 2 is abraded to cause noise and vibration.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the conventional problems described above, and provides a bracket structure for an electric motor that holds a bearing ball bearing by attaching a steel bush to the bearing portion of the bracket after the aluminum die casting of the bracket of the electric motor. The purpose is to do.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the bearing part of the bracket formed by aluminum die casting in a cylindrical shape with a bottom has a cylindrical shape with a bottom, through which the rotary shaft is inserted in the center of the bottom, and the depth of the bearing from the bottom. A bush made of steel with a flange that expands to the outer circumference at the open position above the above is fixed by shrink fitting or press fitting, and the bottom part of the bush made of steel is brought into close contact with the bottom surface of the bearing part. The bearing housing was formed by cutting the inner diameter of the steel bush to match the outer ring of the bearing ball bearing by making a predetermined gap with the mouth.

[0005]

[Action]

 According to the above configuration, the bottomed cylindrical bearing portion formed on the bracket has a cylindrical bottomed hole for inserting the rotary shaft at the center of the bottom surface and an open end at a position exceeding the depth of the bearing portion. A steel bush with a flange that expands to the outer circumference is fixed by shrink fitting or press fitting, and the bottom of the bush is brought into intimate contact with the bottom of the bearing to create a gap between the mouth of the bearing and the flange. The inner diameter of the bush and the inner diameter of the bracket's stator core fitting part were machined coaxially, and the outer ring of the bearing ball bearing was press-fitted into the steel bush.

[0006]

【Example】

 Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view of an electric motor using the bracket structure of the present invention. The bottomed cylindrical bearing portion 2 of the bracket 1 formed by aluminum die casting has a bottomed cylindrical bearing portion and a rotary shaft 3 at the bottom center. A steel bush 6 provided with a hole 4 to be inserted and a flange 5 extending to the outer periphery at the open end is press-fitted and fixed in a state of being in close contact with the bottom of the bearing portion 2, and a predetermined gap is provided between the mouth of the bearing portion 2 and the flange 5. A gap is provided, the outer ring of the bearing ball bearing ring 7 is press-fitted and fixed inside the bush 6, the outer circumference of the stator core 9 is fitted into the stator core fitting portion 8 of the bracket 2, and the inner circumference of the stator core 9 is fitted. The rotor 10 is inserted through the center, and the rotary shaft 3 is fitted into the bearing ball bearings 7 of the left and right brackets 2 and is axially supported to hold the rotor 10 rotatably.

FIG. 2 is a side sectional view of the bracket of the present invention. The bush 6 has a cylindrical shape with a bottom having an outwardly expanding flange 5 and the length from the bottom surface to the flange 5 is bracketed. By making the bush 6 a little longer than the depth of the bearing portion 2, the bush 6 is inserted until the bottom surface of the bush 6 comes into close contact with the bottom surface of the bearing portion 2 when press-fitting or shrink fitting the bush 6, and the bush 6 is inserted into the bearing portion 2. Can be securely fixed. In this state, when cutting the inner diameter of the bush 6 to match the outer ring of the bearing ball bearing 7, the flange 5 increases the mechanical rigidity of the bush 6, and the eccentricity of the stator core 9 and the rotor 10 is reduced. You can Further, when machining the inner diameter of the bush 6, the outflowing machine oil is blocked by the flange 5 so as not to enter between the bush 6 and the bearing portion 2 to prevent the bush 6 and the bearing portion 2 from creeping. be able to.

[0008]

[Effect of device]

 As described above, in the present invention, when the bracket is die-cast, the bearing part is formed into a cylindrical shape with a bottom according to the outer diameter of the steel bush, and the opening at a position exceeding the depth of the bearing part after forming is formed. Aluminum bushings with flanges that extend to the outer periphery at the ends are fixed by shrink fitting or press fitting so that the bottom part closely contacts the bottom surface of the bearing part, and the inner diameter of the bushing is cut to match the outer ring of the bearing ball bearing. In addition to improving workability during processing and preventing the danger of bush setting work, the flange also increases the mechanical rigidity of the bush to improve the cutting accuracy and improve the eccentricity of the stator core 9 and rotor 10. Can be kept low. In addition, by making the length from the bottom of the bush to the flange longer than the depth of the bearing, the bush is securely fixed to the bracket, and the flange at the open end spreads the working oil during machining of the inner diameter of the bush. It is also possible to prevent accidents such as corrosion due to machine oil in advance.

[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

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yuuji Kawai, 1116 Suenaga, Takatsu-ku, Kawasaki-shi, Fujitsu General Limited (72) Koji Mori, 1116, Suetsu-cho, Takatsu-ku, Kawasaki-shi, Fujitsu General

Claims (1)

[Scope of utility model registration request] 1. A bearing part of a bracket formed in a cylindrical shape with a bottom by aluminum die casting, and a hole having a cylindrical shape with a bottom for inserting a rotary shaft in the center of the bottom surface and a position above the depth of the bearing part from the bottom surface. A bush made of steel with a flange that expands to the outer periphery at the open end is shrink-fitted or press-fitted to fix the bottom of the bush made of steel to the bottom of the bearing, and between the flange and the mouth of the bearing. A bracket structure for an electric motor, characterized in that a bearing housing is formed by cutting the inner diameter of a bush made of the same steel in accordance with the outer ring of a bearing ball bearing to form a predetermined gap in the bearing.