JPS62185530A - Motor - Google Patents

Abstract

PURPOSE:To readily assemble a motor by forming a peripheral groove on a rotor shaft disposed at the outer end face of a bearing having a bracket, engaging a resin ring with the groove, and forming a cushion at the ring as a stopper. CONSTITUTION:A stator core 1 is molded with resin 2 to form a stator 3. The stator 3 is formed at both sides with engaging portions 6, 7 of brackets 4, 5, and the brackets 4, 5 are engaged from outside with the engaging portions 6, 7, respectively. Bearings 8, 9 are engaged from outside with the brackets 4, 5 to support a rotor shaft 10. The shaft 10 is formed with peripheral grooves 11, 12 at the outer positions of the bearings 8, 9, and stoppers 13, 14 are engaged with the grooves 11, 12. The stopper 14 is formed of resin, and formed with a plurality of cushions 16 formed by bending it toward outer peripheral side.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to an electric motor configuration that facilitates assembly.

``Prior art-1: The stator and rotor of an electric motor are assembled in such a way that the rotor shaft is passed through a bracket attached to the stator, and the rotor is precisely fixed in the radial and axial directions. There is.

In order to fix the rotor shaft in the radial direction, the bracket is equipped with bearings, and these are coaxially structured with respect to the stator, making it possible to fix the rotor shaft relatively easily, firmly and accurately, and fix it through a small gap. The child and rotor can be opposed to each other.

However, in order to fix the rotor in the axial direction, it must be fixed in the axial direction with respect to the brackets, and in this case, it must be fixed so that it faces the brackets on both sides. There wasn't.

The conventional general configuration is to form a stepped part on the rotor shaft where the diameter increases on the inside of the bracket, and to prevent the rotor shaft from protruding from the bracket, the bracket is fixed to the stator. Ta.

This method has the advantage that it not only provides the simplest and most durable structure, but also enables accurate axial positioning by forming the step.

However, this method requires a cutting process to form stepped portions at the front and rear of the rotor shaft, resulting in a long machining time, and has problems in that the bracket must be used as a stator.

Therefore, an attempt has been made to fix the rotor shaft from the outside of the bracket to solve this problem.

That is, if a stopper is provided on the rotor shaft outside the bracket, the rotor shaft will not move inside the bracket, so the structure is such that brackets are provided on both sides of the stator and the stoppers are applied from the outside.

Such a structure can be easily implemented by forming a circumferential groove on the rotor shaft at a position on the outside of the bracket, and fitting a ring or the like as a stopper into this groove.

Forming the circumferential grooves on the rotor shaft is convenient because it can be processed in a shorter time than cutting the stepped portions.

However, fitting the collar to the bracket 1 in a state where the outer end surface contacts the outer end surface of the bearing that supports the rotor shaft causes the racket 1 to become an obstacle. It is easy to mechanize assembly.

In particular, when fitting the stopper to the rotor shaft perpendicularly to the axis, it is difficult to construct a structure that allows the assembly machine to properly and continuously hold the stopper in a state where it slides on a bearing, etc. This can only be done when the shaft is allowed to have some axial play.

For this reason, attempts have been made to fit the spring 1 to the flange from the axial direction of the rotor shaft. Therefore, I did not like it.

In particular, bushings that are configured to automatically fit in the axial direction by a machine result in considerable sliding scratches on the rotor shaft, and the diameter increases when mated. I had to rely on the [Ringya] C-ring, which has a structure that allows it.

However, with the conventional [ring and C-ring structures], it is not easy to have them continuously gripped by an assembly machine, and it is difficult to support continuous assembly.

Therefore, these methods require a lot of time for assembly, which has been an obstacle to inexpensive manufacturing.

[-Problems to be solved by the invention] The present invention has been made in view of these circumstances,
The purpose of the present invention is to provide an electric motor with a structure that solves the problems of the conventional technology, such as ease of assembly with a machine.

"Means for Solving the Problem" The present invention provides a bracket with a bearing, a circumferential groove formed around the rotor shaft located on the outer end surface of the bearing, and a resin-made groove that fits into the groove. The problem is solved by forming a ring and bending the ring at an appropriate position toward the outer diameter to form a cushion portion that serves as a stopper.

"Function" Because the stopper is made of resin, it will not cause any sliding scratches even if it is moved once on the rotor shaft, and the cushion part formed by bending it toward the outer diameter will act to expand the inner diameter of the ring. It is easy to fit onto a rotor shaft with a large outer diameter.

Therefore, even if the stopper is forcefully fitted from the end of the rotor shaft, the stopper inevitably has a large inner diameter and can be easily fitted into the groove of the rotor shaft.

Furthermore, in this case, fitting can be achieved simply by pushing the stopper in the axial direction, making mechanization extremely easy.

"Embodiment" The present invention will be described based on an embodiment shown in the drawings. FIG. The figure is a perspective view of the stopper.

In FIG. 1, the electric motor includes a stator core 1 molded with resin 2 to form a stator 3. As shown in FIG.

Fitting portions 6.7 for brackets 4.5 are formed on both sides of the stator 3, and one racket 4.5 is fitted into each of the fitting portions 6.7 from the outside.

Furthermore, a bearing 8.9 is fitted into the bracket 4.5 from the outside and supports the rotor shaft 10.

Further, the rotor shaft 10 has a circumferential groove 11.12 formed at a position outside the bearing 8.9, and a stopper 13.14 is fitted into this groove 11.12.

A spring 15 acting in the axial direction is provided between one of the bearings 9 and the bracket 5.
1110 is configured to perform axial adjustment.

As shown in FIG. 2, the stopper 14 is molded from resin and has a ring shape with a square cross section and a plurality of cushion portions 16 bent toward the outer diameter. ing.

This cushion part 16 can be provided with just one piece.
When the inner diameter side of the collar 14 is pushed outward in the outer diameter direction,
Any structure may be used as long as the cushion portion 16 is bent so that the inner diameter of the stopper 14 expands.

In such a configuration, the electric motor constitutes the stator 3,
Attach the bearings 8.9 and support the rotor shaft 10.

Then, the bracket 4 equipped with the bearing 8 is attached to the bearing 8 side which is the other end of the rotor shaft 10, and the stopper 13 is fitted to the end 11 of the rotor shaft 10.

In this case, since the bracket 4 can move toward the rotor unless fixed to the stator 3, the groove 11 can be exposed to a position sufficiently in front of the bearing 8, making it easy to fully fit the stopper 13. can.

Next, the bracket 4 is fitted into the fitting part 6 of the stator 3, and the bracket 5 is fitted from one end of the rotor shaft 10.

Then, the bracket 5 is fitted into the fitting portion 7 of the stator 3, and the stopper 14 is fitted from one end of the rotor shaft 10.

The stopper 14 is fitted to the rotor shaft 10 by forcing the stopper 14 into the rotor shaft 10, so that the inner diameter side is expanded to the rotor shaft 10 and the stopper 14 inevitably fits into the rotor shaft 10. When the stopper 14 reaches the groove 12, it falls into the groove 12. Make sure it fits properly.

Since the stopper 14 (cushion part 16 formed on the outer diameter side) is bent, when the inner diameter side is pushed in the outer diameter direction, the bent portion deforms well and the inner diameter side can be easily moved. Transform to become larger.

Therefore, the stopper 14 having an inner diameter smaller than the outer diameter of the rotor shaft 10 can be easily fitted onto the rotor shaft 10, and since the direction of this fitting is in the axial direction, the shape of the stopper 14 in the axial direction is Since they are planar, it is easy to stack them in the plane direction and mechanically fit them one by one to the rotor shaft 10.

To describe an example of the principle of automatic insertion using such a machine, a large number of strips I to flange 14 are fitted around a shaft, the tips of which abut against rotor shaft 10, and one strip 1 to flange 14 is inserted. Immediately use the studs 1 to 14 to fit the rotor shaft 10 into the rotor shaft 10.

Then, when the stopper 14 fitted to one end of the rotor shaft 10 is pushed in with a jig such as a pipe, the stopper 14 moves the rotor shaft 10-7 to the groove 12 and fills the
Fits in.

When fitting the stopper 14 in this way, if the stopper 14 is made of resin, no damage will be caused to the rotor shaft 10, and the fitting of the stopper 14 will be ensured.
can be fitted into the groove 12.

Therefore, even if the stopper 14 is moved by the bracket 5 or the bearing 9, it can be fitted to the rotor shaft 10 without any problem, and the conventional problems are solved.

In addition, the spring 15 interposed between the bracket 5 and the bearing 9 can be omitted if the stopper 14 can be easily fitted to the rotor shaft 10 in this way, but there is no problem with the spring 15 interposed between the bracket 5 and the bearing 9. The spring axis is conveniently used to absorb the small tolerances that occur between brackets 1 to 4.5, and the rotor @ 10 has no axial clearance.
It becomes easier to assemble.

[-Effects of the Invention] According to the present invention, fitting the stopper to the rotor shaft becomes easy, mechanization is possible, and the gap in the axial direction of the rotor shaft can be extremely reduced. Since the stopper is made of resin, it is possible to use the stopper directly for sliding with the bearing, making it possible to use the stopper as a component.
Noisy members can be eliminated.

In addition, it is possible to improve the component configuration and assemblability of the electric motor, which is configured so that the bracket is sandwiched between the stoppers, and to create a high-quality and inexpensive electric motor.
The effect is significant.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of an electric motor showing an embodiment of the present invention, and FIG. 2 is a perspective view of a stopper. 3... Stator, 4.5... Bucket, 8.9.
...Bearing, 10...Rotor shaft, 11.12...
Groove, 13.14 Stopper, 16...Cushion part.

Claims (1)

[Claims] In an electric motor, a rotor shaft is passed through the rotor shaft by fitting brackets on both sides of the stator, and a stopper is provided on the outside of the bracket of the rotor shaft. A stopper is formed by forming a circumferential groove in the groove, forming a resin ring that fits into the groove, and bending this ring at an appropriate position toward the outer diameter to form a cushion portion. electric motor.