JPH0360905A - Method for processing stator housing and device used therefor - Google Patents

Abstract

PURPOSE:To work a bearing part with high accuracy without rotating a stator and housing in a heavy weight by aligning the rotating shaft of a device to the center shaft of a stator with the stator inner periphery as the reference and working the bearing part by the tools fitted before and after. CONSTITUTION:A spreading member 18 having a tapered face 19 is advanced in the longitudinal direction by adjusting a screw member 20 to spread a mandrel part 16 and the center axial line C1 of a rotating shaft part 44 is conformed with the center shaft of the inner periphery of a stator 10. Air is fed from the air inlet port 26 of a rotating joint 24, the rotation of an air motor 30 is transmitted to a gear 34 via a gear 36 and the air motor 30 is rotated together with the rotating shaft part 44 by the reaction force thereof. Tool posts 38L, 38R, tools 42L, 42R sliding in the longitudinal direction by hydraulic cylinder/piston mechanisms 32L, 32R are provided, a pressure oil is fed from an inlet port 28, a bearing recessed place SL and faucet part SR are formed in a concentric state of high accuracy.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for machining a bearing recess of a stator housing, etc., in order to improve the bearing accuracy of an output shaft by using a machining opening of a stator housing to which a stator is attached, and the method thereof. This device is particularly effective for large motors.

[Conventional technology]

In general, a motor consists of a stator housing to which the stator is fixed, an output shaft, a rotor part fixed to the output shaft and arranged facing the stator, and front and rear lid members (referred to as a front flange and a rear bracket). I warn you from Among these, the stator housing may be integrated or divided into front and rear housings. The former is often used for small motors, and the latter for large motors.

These housings are formed with a bearing recess for bearing the output shaft, or a pilot part for attaching a front or rear cover member having a bearing recess. Generally, this bearing recess or part of the spigot is processed in separate steps when the housing is a single piece.

[Problem to be solved by the invention]

However, when the components are assembled to form a motor, the accuracy of the concentricity of the front and rear bearing recesses decreases due to the influence of assembly accuracy. For small motors, it is relatively easy to fix the stator to the housing and then grip it with a lathe or the like and process it, but it is often difficult to use this method, especially for large motors.

If the concentricity of the front and rear bearing parts is insufficient, vibration and noise will occur as the output shaft rotates.

SUMMARY OF THE INVENTION Therefore, in order to solve this problem, the present invention aims to provide a method and apparatus for machining a stator housing that improves the concentricity of the front and rear bearing recesses.

[Means to solve the problem]

In view of the above object, the present invention has a bearing recess for the output shaft of the motor located at one end of the housing to which the stator is attached, and another bearing recess for the output shaft located at the other end. The present invention provides a method for machining a stator housing, characterized in that a mounting portion of a lid member is simultaneously machined using two tools that rotate together around a central axis based on the inner circumferential surface of the stator.

Further, a mandrel part that holds the stator by pressing the inner circumferential surface of the stator from inside and a bearing between the mandrel part and the mandrel part are rotatable about the central axis of the mandrel part, and the stator A stator housing machining device is provided, characterized in that it is equipped with a rotating body on each side of which a tool is attached that is capable of machining the integral housing portion and the rear housing portion.

[For production]

According to the above method and apparatus, the housing to which the stator is attached is processed after assembly with the stator to form a front or rear bearing recess for bearing the output shaft and the other bearing recess. The part of the spigot to which the lid member is attached can be machined at the same time using two tools having the same rotation center axis, which in turn improves bearing precision.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings. Referring to FIG. 1, a front housing 12 is assembled and fixed to the front side (left side in the figure) of the stake 10, and a rear housing 14 is assembled and fixed to the rear side.

The front and rear housings 12 and 14 function to support the output shaft (not shown) of the motor, but in the motor of this embodiment, the front housing 12 directly accommodates the bearing in the bearing recess SL, and the rear housing 12 directly accommodates the bearing in the bearing recess SL. Reference numeral 14 is configured to attach a cover member (not shown) having a bearing recess, that is, a disc member that closes the rear part of the rear housing 14, to the spigot part SR.

Therefore, in order to accurately support the motor output shaft,
As shown in FIG. 1, after the front and rear housings 12, 14 are assembled to the stator 10, the bearing recess SL and the spigot part SR should be machined.

FIG. 1 also shows the equipment that performs the processing.

The above device will be explained below. The opening mandrel portion 16 is
It holds the stator 10 by pressing it against the inner periphery of the stator 10, and also serves to align the center axis of the stator with the center axis C1 of the rotating shaft portion 44, which will be described later, with the inner circumferential surface of the stator as a reference. In this case, the opening mandrel portion 16 is expanded by moving the expanding member 18 having the tapered surface 9 forward in the longitudinal direction by adjusting the screw member 20. Bearings 22 are provided at the front and rear of the inner periphery of the mandrel portion that is press-fitted to the inner periphery of the stator lO, and the rotating shaft portion 44 supported by the bearings 22 is rotatable about its central axis C1. It is composed of The rotational power for this rotating shaft portion 44 is obtained from the air motor 30 fixed to the rotating shaft portion 44 . A well-known rotary joint 24 is interposed at the rear end of the rotary shaft portion 44, and air is supplied to the air motor 30 from an air port 26 at the rear thereof. The rotation of the air motor 30 rotated by the supplied air is transmitted via a low speed gear 36 to an internal gear 34 fixed to the mandrel portion. Since the internal gear 34 is stationary, the air motor 30 is rotated together with the rotating shaft portion 44 by its reaction force.

A tool rest 38L that can be slid in the longitudinal direction by a hydraulic cylinder/piston mechanism 32L is provided at the front part of the rotating shaft section 44.
A tool 42L attached to the tool post 38L is also provided. Also, at the rear, there is a tool rest 3 that can be slid in the longitudinal direction by another hydraulic cylinder/piston mechanism 32R.
8R and the tool 42R attached to the tool rest 38R
is provided. Pressure oil is supplied to these two hydraulic cylinder/piston mechanisms from a pressure oil inlet 28 provided in the rotation joint 24 described above.

With the above configuration, since the front and rear tools 42L and 42R are simultaneously evaluated around one central axis Ct, the bearing recess SL and the spigot part SR can be formed in a highly accurate concentric state. Furthermore, when processing the end surface S' of the housing 14, it can be easily carried out by combining another hydraulic cylinder/piston mechanism that further slides the tool rest 38R in the radial direction with respect to the rotating shaft portion 44. be.

The device according to the present invention is particularly effective when the stator and housing of a large motor are difficult to chuck with a lathe.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the rotation center axis of the device is aligned with the stator center axis based on the inner circumferential surface of the stator, and the front and rear of the member rotating about the one center axis are aligned. Since the bearing part is machined using the attached tool, the concentricity of the front and rear bearing parts is improved, which in turn improves the rotation accuracy of the motor output shaft, contributing to lower vibration and noise.

Furthermore, for large motors exceeding 30KW, for example, high-precision machining of bearing parts etc. can be easily performed by rotating the small diameter device of the present invention without rotating the heavy stator and housing. becomes.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing processing of a housing integrated with a stator using the apparatus according to the present invention. DESCRIPTION OF SYMBOLS 10... Stator, 12... Front side nozzing, 14... Rear side housing, 16... Opening mandrel part, 42L, 42R... Tool, 44...
Rotating shaft.

Claims (1)

[Claims] 1. A lid having a bearing recess for the output shaft of the motor located at one end of the housing to which the stator is attached, and another bearing recess for the output shaft located at the other end. A method of machining a stator housing, characterized in that a mounting portion of a member is simultaneously machined using two tools that rotate together around a central axis based on the inner circumferential surface of the stator. 2. A mandrel part that presses the inner circumferential surface of the stator from the inside to hold the stator, and a mandrel part that is rotatable about the central axis of the mandrel part with a bearing interposed between the mandrel part and the stator. 1. A stator housing machining device, comprising: a rotating body having a tool attached to each side, which is capable of machining integrated front and rear housing parts.