JPH0135550Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bearing device for a motor, and is particularly intended to prevent noise generation in the bearing portion.

[Conventional technology]

In a conventional motor bearing device, a rotor shaft 1 is rotatably supported by a bearing metal 2, and a bearing abuts an end bracket 6, as shown in FIG. It has a structure in which an elastic body 5 such as rubber is interposed between the metals 2, an oil-impregnated felt 4 is housed, and a metal spring 3 presses the bearing metal 2 so that it does not slip out.

[Problem that the invention attempts to solve]

However, the conventional structure had the following problems.

Since the elastic body interposed between the bearing metal and the end bracket was subjected to force over a relatively narrow area, it was easily deformed and unreliable in terms of durability.

Because the structure supported thrust and radial forces in one place, it was not possible to ensure the positional accuracy of the bearing metal.

When the elastic body is made of a rubber material, the elastic body comes into direct contact with the oil-impregnated felt or the bearing metal, causing a chemical change due to oil and heat, which tends to cause deterioration.

An object of the present invention is to provide a motor bearing device having a structure in which a bearing metal is supported by an elastic body and the elastic body is arranged to be isolated from oil and heat.

[Means to solve the problem]

According to the present invention, this purpose is such that the motor bearing device receives the forces in the thrust direction and radial direction pushed by the rotor shaft on the cylindrical portion and flat portion of the elastic body located between the end bracket and the metal holder. This is achieved by providing a bearing device for a motor that has the following characteristics.

〔Example〕

In FIG. 2, A and B, 1 is the rotor shaft. A bearing metal 2 rotatably supports the rotor shaft 1. The metal spring 3 has an annular base 3b with arm portions 3a formed on the inner periphery and several cutout portions 3' on the outer periphery. Oil-impregnated felt 4
is a thick annular member with an open center. The elastic body 5 is made of an elastic material such as rubber and has a cylindrical portion 5a and a flat portion 5b, and a hole 5c is provided in the center of the flat portion 5b. The end bracket 6 has a bearing housing portion 6' formed of a cylindrical small diameter portion 6a and a closing portion 6b that closes the thrust direction of the motor. The metal holder 7 is attached to the small diameter portion 6 of the end bracket 6.
A cylindrical portion 7a having a smaller diameter by the thickness of the elastic body 5 than a, an end wall 7b in the thrust direction, a receiving surface portion 7c for holding the bearing metal 2, and an opening 7d at the center of the receiving surface portion 7c. Further, a protruding portion 7' is formed on the circumference of the open end of the cylindrical portion 7a. 8
is a cylindrical yoke. In the above components, the elastic body 5 is mounted on the outer periphery of the metal holder 7, and the oil-impregnated felt 4 for supplying oil to the rotor shaft 1 and the bearing metal 2 is housed inside the metal holder 7. Next, the cut portion 3' of the metal spring 3 engages with several protrusions 7' formed on the circumference of the open end of the cylindrical portion 7a of the metal holder 7, forming a unit. As a result, the bearing metal 2 is connected to the arm portion 3a of the metal spring 3 and the receiving surface portion 7c of the metal holder 7.
It will be held by The assembled unit is press-inserted into the bearing accommodating portion 6' of the end bracket 6, and finally the rotor shaft 1 is inserted into the bearing metal 2. As a result, the elastic body 5 interposed between the end bracket 6 and the metal holder 7 is attached to the small diameter portion 6a of the end bracket 6.
The cylindrical portion 7a of the metal holder 7 makes elastic contact in the radial direction, and the closing portion 6b of the end bracket 6 and the end wall 7b of the metal holder 7 make elastic contact in the thrust direction.

[Effect]

As described in detail above, the motor bearing device according to the present invention transfers the force in the thrust direction and the radial direction pushed by the rotor shaft to the flat part in the thrust direction and the flat part in the radial direction of the elastic body interposed between the end bracket and the metal holder. Since each bearing is received by a cylindrical part, the bearing metal can be held in an accurate position to ensure the accuracy of the motor. In addition, since the load is received over a wide surface, the force applied to the elastic body is dispersed, so durability can be improved. Furthermore, the elastic body between the end bracket and the metal holder does not come into direct contact with the bearing metal and oil-impregnated felt, and is not deformed by thermal deformation or chemical change.

[Brief explanation of the drawing]

FIG. 1 shows a conventional motor bearing device. FIG. 2A is an explanatory diagram of the components of the motor bearing device according to the present invention. FIG. 2B is an assembly diagram of the motor bearing device according to the present invention. 1: Rotor shaft, 2: Bearing metal, 3: Metal spring, 3a: Arm, 3b: Base,
3': cut-off part, 4: oil-impregnated felt, 5: elastic body,
5a: cylinder part, 5b: flat part, 5c: hole, 6: end bracket, 6a: small diameter part, 6b: closing part,
6': bearing housing part, 7: metal holder, 7a: cylindrical part, 7b: end wall, 7c: receiving surface part, 7d: opening part, 7': protruding part, 8: yoke.

Claims (1)

[Scope of utility model registration request] A bearing metal 2 that rotatably supports a rotor shaft 1 of a motor, a metal holder 7 and a metal spring 3 that hold the bearing metal 2, and an oil-impregnated felt 4 accommodated between the metal holder 7 and the metal spring 3. , an end bracket 6 that closes an opening of a yoke 8 and has a bearing accommodating portion 6'; and an elastic body 5 interposed between the end bracket 6 and the metal holder 7; The bearing accommodating portion 6' of the bracket 6 is formed of a small diameter portion 6a whose diameter is smaller than the diameter of the yoke 8, and a closing portion 6b, and the elastic body 5 is a cylindrical portion that is press-inserted into the small diameter portion 6a of the end bracket 6. 5a and the end bracket 6
The metal holder 7 has a flat part 5b that comes into contact with the closing part 6b of the elastic body 5.
An end wall 7b that holds the flat part 5b of the elastic body 5 is formed between the cylindrical part 7a inserted into the end bracket 6 and the closed part 6b of the end bracket 6, and a receiving surface part 7c for holding the bearing metal 2. Several protrusions 7' are formed at the open end of the cylindrical portion 7a, and several protrusions 7' are formed on the outer periphery of the base 3b of the metal spring 3 to engage with the protrusions 7' of the metal holder 7. A bearing device for a motor, characterized in that a cutout portion 3' is formed.