JPH0530701A - Motor - Google Patents

Abstract

PURPOSE:To provide a motor wherein automatization and cost reduction of motor assembly can be realized by giving an optimum preload to a bearing. CONSTITUTION:One end of a coil spring 5 and the other end, having a flat surface part, are brought into press contact respectively with a rotor 1 and an inner ring of a bearing shaft bush 6 to fit it slidably to a shaft 2, and a load of the coil spring 5 is uniformly applied to the inner right of the bearing shaft bush 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor using a coil spring for preloading a bearing.

[0002]

2. Description of the Related Art In recent years, in the case of using a bearing as a bearing, when a small bearing is used, a leaf spring is generally used to preload the load side axial direction.

A conventional motor of this type will be described with reference to FIG. As shown in the figure, the load side bearing 11 is attached to the load side bracket 11 (hereinafter referred to as bracket A).
2 (hereinafter referred to as "bearing bearing A") forms a bearing housing 13, and an anti-load side bracket 14 is formed.
Anti-load side bearing 15 (hereinafter referred to as bracket B)
A stator 18 that forms a bearing housing 16 in which (hereinafter, bearing bearing B) is housed and is provided with a winding wire 17
Is fitted and held by the bracket A11 and the bracket B14, and a bearing positioning E-ring 21 is provided on the shaft 20 into which the rotor 19 is press-fitted.
12 and the bearing bearing B15 are press-fitted to the position of the E-ring 21 provided on the shaft 20, the bearing housing 16 is provided with a leaf spring 22 for preloading the bearing bearing B15, and the bearing housings 13 and 16 allow the bearing bearing 12 and Bearing bearing 15
Was slidably stored and configured.

[0004]

In such a conventional motor, it was not possible to freely design the spring characteristics of the leaf spring 22 due to the dimensional restrictions of the bearing housings 13 and 15. Further, since the leaf spring 22 provided on the bearing housing 16 falls due to reversal and movement during assembly, grease is applied to the bottom of the bearing housing 16,
It was necessary to devise such as using the leaf spring 22 by attaching it to grease. Further, there is a problem that the E-linda 21 and the like are indispensable as a member for positioning and fixing the bearing.

The present invention solves the above problems, and an object thereof is to provide a motor capable of automating the motor assembly and reducing the cost.

[0006]

In order to achieve the above object, a motor of the present invention comprises a bearing bearing slidably fitted on a shaft into which a rotor is press-fitted, and a coil spring wound around the shaft. And one end of the coil spring is in pressure contact with the inner ring of the bearing bearing, and the other end is in pressure contact with the rotor.

[0007]

In the motor of the present invention, the coil spring can be inserted in a large space with the above-described structure, so that the spring characteristics can be freely designed and the bearing can be preloaded optimally. Further, the problem of spring drop is eliminated, and automatic assembly is facilitated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

The same parts as those of the conventional example are designated by the same reference numerals and detailed description thereof will be omitted. As shown in the figure, the shaft 1 into which the rotor 1 is press-fitted and the E-ring 3 on the load side
A bearing bearing A4 is slidably provided via
A coil spring 5 wound around the shaft 2 so as to be slidable on the counter load side of the shaft 2 is provided with a rotor 1 and a bearing B.
The coil spring 5 is provided between the first and second coil springs 6 and 6 so as to be brought into contact with the inner ring of the bearing B6, and the other end of the coil spring 5 is brought into contact with the rotor 1.

With the above structure, the load of the coil spring 5 slidably fitted on the shaft 2 is evenly applied to the inner ring of the bearing B6 to suppress the generation of noise and vibration.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the figure, the rotor 1 side portion of the coil spring 7 provided between the rotor 1 and the inner ring of the bearing bearing B6 is formed in a small diameter so as to be fitted and locked on the shaft 2, and the bearing The bearing B6 side is loosely fitted to the shaft 2, and the plane end of the coil spring 7 is set to the bearing bearing B.
It is configured so as to abut on 6.

With the above-mentioned structure, the coil spring 7 has the rotor 1
Locked to the shaft 2 at the side part, bearing bearing B6
Since it is in a loosely fitted state on the side, the load of the coil spring 7 is evenly applied to the inner ring of the bearing B6, which suppresses the occurrence of vibration and improves the quality because the coil spring 7 does not run idle.

In the first embodiment of the present invention, the end surface of the coil spring 5 is made flat so as to be pressed against the inner ring of the bearing bearing B6. However, when the small bearing bearing B6 is used, the width of the inner ring is narrow. As shown in FIG. 3, a washer 8 having an abutting portion for abutting against the inner ring of the bearing bearing B6 on one surface and a receiving portion for the coil spring 5 on the other surface is provided on the inner ring of the bearing bearing B6 and the coil spring 5. Even if it is provided between them, the same effects as those of the first embodiment are brought about.

Further, in the second embodiment, the inner diameter of the coil spring 7 is reduced so that the coil spring 7 is locked to the rotor 1 side portion of the shaft 2. However, as shown in FIG. Even if the locking hole 9 is formed and the end portion of the coil spring 10 is engaged with the engaging hole 9 to prevent the coil spring 10 from idling,
The same effect as the embodiment is brought about.

[0016]

As is apparent from the above embodiments, according to the present invention, a bearing bearing slidably provided on a shaft into which a rotor is press-fitted and a coil spring wound around the shaft are provided between the rotor, Since the load is evenly applied to the inner ring of the bearing, the space for inserting the spring can be made large, the spring characteristics can be freely designed, the bearing can be optimally preloaded, and the race noise can be prevented and the durability can be improved. The property is improved. Further, unlike the case of using a leaf spring, the problem of spring drop is eliminated, automatic assembly is facilitated, grease and positioning parts for one bearing bearing are not required, and a material cost can be reduced. .

[Brief description of drawings]

FIG. 1 is a sectional view of a motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the motor of the second embodiment.

FIG. 3 is a cross-sectional view showing a mounted state of a coil spring showing another example of the first embodiment.

FIG. 4 is a sectional view showing a mounted state of a coil spring showing another example of the second embodiment.

FIG. 5 is a sectional view of a conventional motor

[Explanation of symbols]

 1 Rotor 2 Shafts 5, 7, 10 Coil springs 6 Bearing bearings

Claims (1)

Claim: What is claimed is: 1. A bearing bearing slidably fitted to a shaft press-fitted into a rotor, and a coil spring wound around the shaft, wherein one end of the coil spring is the bearing. A motor in which the other end of the bearing is pressed against the inner ring of the bearing.