JPH04114742U - Vehicle induction motor - Google Patents

Abstract

(57) [Summary] [Purpose] To maintain high reliability and high durability and reduce weight in a vehicle induction motor driven by variable voltage and variable frequency. [Configuration] Steel boss 10 installed on the surface in contact with the bearing box
An aluminum alloy bracket 4' that is shrink-fitted to the steel boss 10 is provided, and the steel boss 10 has a pincushion shape and the outer diameter of one of its flange is set to match the heat generated when the aluminum alloy bracket 4' is shrink-fitted. Construct smaller than the expanded size.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a vehicle induction motor driven by a variable voltage, variable frequency inverter. It is something to do.

0002

[Conventional technology]

In recent years, induction motors for vehicles driven by inverters have been commonly used, and this is illustrated in Fig. 5. Figure 5 is a sectional view of the upper half of a vehicle induction motor, where 1 is a stator and 2 is a rotor. , 3 is the rotor shaft, 4 is the iron drive side bracket, 5 is the roller bearing box, 6 is the roller bearing, 7 is an iron non-drive side bracket, 8 is a ball bearing box, and 9 is a ball bearing. The stator 1, rotor 2, and rotor 3 are common components of an electric motor, and their explanation will be omitted. However, the iron drive side bracket 4, roller bearing box 5, roller bearing 6, iron The non-drive side bracket 7, the ball bearing box 8, and the ball bearing 9 have the structure of the bearing support part according to the present invention. This is Naribe.

0003 Conventionally, in order to achieve high reliability and high durability of the bearing support part of induction motors for vehicles, An iron drive side bracket 4 and an iron non-drive side bracket 7 made of steel or cast iron are provided. It was designed to support the bearings.

0004

[Problem that the idea aims to solve]

As mentioned above, the brackets of conventional induction motors for vehicles are made of steel or cast iron. It is. Therefore, the mass of the entire motor becomes large, which causes a large negative impact on the orbit. This caused a burden on vehicles, which hindered the speeding up of vehicles.

[0005]

[Means to solve the problem]

This invention was developed with the aim of reducing the weight of induction motors for vehicles, and supports the bearings. The bracket is made of aluminum alloy, and the steel boss located on the surface in contact with the bearing box is Shrink fit, and the steel boss has a pincushion shape, and the outer diameter of one flange is is designed to have dimensions that do not exceed the thermal expansion dimensions of the aluminum alloy bracket during shrink fitting. It is something to do.

[0006]

[Effect]

With this invention, the bracket is made of aluminum alloy, making it possible to reduce the weight of the electric motor. In addition, the flanges at both ends of the steel boss greatly improve thrust load capacity. Furthermore, the structure of limiting the outer diameter dimension of the flange of the steel boss described above is similar to that of the aluminum alloy boss. Realizes smooth racket shrink fitting work.

[0007]

【Example】

Similar to FIG. 5, which is a cross-sectional view of the upper half of the vehicle induction motor described in the prior art section, To explain the present invention, FIG. 1 shows an external view of the drive side bracket of the present invention, and FIG. 2 ( A) shows a sectional view taken along the line A--A in FIG. 1, and FIG. 2(B) shows a section C in FIG. This is an enlarged view. Moreover, FIG. 3 shows an external view of the non-drive side bracket of the present invention, and FIG. (A) shows a cross-sectional view taken along line A--E in FIG. 3, and FIG. 4(B) shows a cross-sectional view taken along It is an enlarged view of the part. 4' is an aluminum alloy drive side bracket, 7' is an aluminum alloy drive side bracket. In the drive side bracket, 10 is a steel boss on the drive side, and 11 is a steel boss on the non-drive side.

[0008] Therefore, the bearing of the electric motor is connected to the aluminum alloy drive side bracket 4' of the present invention. It is supported by a non-drive side bracket 7' made of aluminum alloy, and these brackets are A steel boss 10 on the drive side and a steel boss 11 on the non-drive side, respectively, are installed on the surface that contacts the bearing box. This is a shrink fit. Note that these steel bosses have a pincushion-shaped tsuba. The outer diameter of the bracket must not exceed the thermal expansion dimension when shrink fitting the aluminum alloy bracket mentioned above. It is designed to have a large size.

[0009] In the above configuration, the aluminum alloy bracket is shrink-fitted to the steel boss. As a result, residual stress is generated at the fitting part between the aluminum alloy bracket and the steel boss. Even if the temperature of the induction motor increases, the fit between the aluminum alloy bracket and the steel boss will There are no gaps in the openings, making it sturdy and reliable under any usage conditions. Brackets can be provided.

0010

[Effect of the idea]

With this invention, the component part where the aluminum alloy bracket is shrink-fitted to the steel boss is It has an aluminum alloy bracket, which reduces the weight of the motor by 5% to 10%. This contributes to faster vehicle speeds. In addition, the flanges at both ends of the steel boss are Provides a highly reliable bracket with significantly improved last load capacity. Furthermore, by providing a steel boss at the joint with the bearing box, the motor can be easily repaired. Prevents galling and peeling of joint surfaces that may occur during disassembly and assembly. In addition, the durability of the joint against vibration and shock can be maintained at the same level as before. I can do that.

[0011]

[Brief explanation of drawings]

FIG. 1 is an external view of a drive side bracket showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line A--A in FIG. 1 and a partially enlarged view thereof.

FIG. 3 is an external view of a non-drive side bracket showing an embodiment of the present invention.

FIG. 4 is a sectional view taken along the line E--E in FIG. 3 and a partially enlarged view thereof.

FIG. 5 is a sectional view of the upper half of a conventional induction motor for a vehicle.

0012

[Explanation of symbols]

1 Stator 2 rotor 3 Rotor shaft 4’ Aluminum alloy drive side bracket 5 Roller bearing box 7’ Aluminum alloy non-drive side bracket 8 Ball bearing box 10 Drive side steel boss 11 Non-drive side steel boss

Claims (1)

[Scope of utility model registration request] Claim 1: A vehicle induction motor driven by a variable voltage, variable frequency inverter, comprising a steel boss disposed on a surface in contact with a bearing box, and an aluminum alloy bracket shrink-fitted to the steel boss. The induction conductor for a vehicle is characterized in that the steel boss has a pincushion shape and the outer diameter of one of the flanges does not exceed the thermal expansion dimension when the aluminum alloy bracket is shrink-fitted.