JPS6114291Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing structure for a bracket of a small electric motor.

The purpose of this invention is to standardize the bracket and reduce costs by supporting ball bearings, spherical bearings with different outer diameters, oil pots for oil lubrication, etc. with the same bracket without using other parts. The purpose is to provide an inexpensive bracket for a small electric motor.

Conventional small electric motors are shown in FIGS. 6 to 12. Fig. 6 is a top view of the small electric motor, Fig. 7 is a partial front view, Fig. 8 is a cross-sectional view taken along A-O-B in Fig. 6, and Fig. 9 is a small electric motor with oil lubrication on the outside. FIG. 10 is a cross-sectional view of a bearing using a ball-centered bearing, and FIG. 11 is a cross-sectional view of a bearing using a ball-centered bearing with an outer diameter different from that of the ball-centered bearing. 12 are cross-sectional views of a bearing section using ball bearings.

Next, the conventional configuration will be explained with reference to FIG. 1 is a bracket A, 2 is a spherical bearing, 3 is a bearing holder, and 4 is an oil pot A. The spherical bearing 2, bearing holder 3, and oil pot A4 are fixed to the bracket A1. Reference numeral 5 denotes a bracket B which fixes the spherical bearing 2, bearing holder 3, and oil pot A4. 6 is a shaft, and 7 is a thrust washer. This thrust washer 7 is fixed to the shaft 6 and forms one thrust mechanism with the oil pot A4.

8 is a thrust ball, and 9 is a thrust ball receiving plate. The thrust ball 8 contacts the center hole of the shaft 6 and the thrust ball receiving plate 9 to form the other thrust mechanism.

A rotor 10 is fixed to the shaft 6. 11
is a stator, 12 is a through bolt, and the stator 11 is positioned with a certain gap between it and the rotor 10, and the brackets A1 and B5 are fixed with the through bolts 12 by fitting both end faces and outer diameters of the stator. ing.

Next, the operation of the bearing section of the conventional small electric motor constructed as described above will be explained. As the rotor 10 rotates, the shaft 6, thrust washer 7, and thrust ball 8 rotate together.

On the other hand, the bracket A1 and the spherical bearing 2 are in spherical contact as shown in FIG. There is. The same applies to bracket B5.

Next, the configuration of FIG. 9 will be explained. The spherical bearing 2, bearing holder 3, and oil pot A4 are fixed to a bracket B5. 13 is an oil drainer, which is fixed to the shaft 6. 14 is an oil pot B, 15 is a rivet, and this rivet 15 connects the oil pot B14 to the bracket B.
It's stuck at 5. In this configuration, shaft 6 and oil drain 1
It rotates together with 3. On the other hand, the bracket B5 and the spherical bearing 2 are in contact with each other on a spherical surface as shown in FIG.
is fixed to the bracket B5 and supports the shaft 6.

Next, the configuration of FIG. 10 will be explained. The spherical bearing 2, bearing holder 3, and oil pot A4 are fixed to the bracket A1. The thrust ball 8 is inserted into the center hole at the end of the shaft and comes into contact with the thrust ball receiving plate 9.
The thrust ball receiving plate 9 is in contact with the bracket A1. Next, the operation of the bearing section having the above structure will be described. The shaft 6 and the thrust ball 8 rotate together and slide on the contact surface with the thrust ball receiving plate 9. This thrust ball receiving plate 9 is in stationary contact with the bracket A1 and receives a thrust load.

Next, the configuration shown in FIG. 11 will be explained. 1a is a bracket A, 2a is a spherical bearing, and 3a is a bearing holder, and the spherical bearing 2a, bearing holder 3a, and oil pot A4 are fixed to the bracket A1a. The thrust ball 8 is inserted into the center hole at the end of the shaft and is in contact with a thrust ball receiving plate 9, which is in contact with the bracket A1a.

Furthermore, the structure of the bearing shown in FIG. 12 will be explained. 6a is a shaft, 16 is a retaining ring, and this retaining ring 16 is fixed to the shaft 6a. 2b is a ball bearing, 1b is a bracket A, the ball bearing 2b is fixed to the shaft 6a, and the ball bearing 2b is inserted into the bracket A1b.

Next, the operation of the bearing section constructed as described above will be described. The bracket A1b and the outer ring of the ball bearing 2b are stationary, and the shaft 6a, the retaining ring 16, and the inner ring of the ball bearing 2b rotate together.

As mentioned above, the disadvantages of conventional brackets are:
Since the bracket and the spherical bearing are in contact with each other on the spherical surface,
If the outer diameter of the spherical bearing 2a is different as shown in Fig. 11,
The bracket 1a that contacts the ball center bearing cannot be used in common with the bracket 1 shown in FIG.
Even when the bearing is a ball bearing 2b as shown in the figure, the shape of the bearing part of the bracket 1b cannot be shared with the bearing part of FIGS. 9 and 10. Further, other members such as rivets 15 are required to secure the lubricating oil pot B14 to the bracket B5.

Therefore, since a dedicated bracket must be used for each electric motor, several types of brackets must be prepared depending on the type of bearing. As a result, time is spent replacing the bracket mold, and time is also spent managing parts, making it difficult to standardize and resulting in expensive brackets.

The present invention solves the above-mentioned drawbacks by making it possible to use ball bearings, spherical bearings with different outer diameters, and oil pots for oil lubrication in the same bracket without using other parts. The aim is to standardize the motors and provide a small electric motor that is inexpensive.

The present invention will be described below with reference to embodiments shown in the figures. Fig. 1 is a sectional view of the small electric motor in this embodiment, Fig. 2 is a sectional view of a bearing portion provided with an oil pot for oil lubrication on the outside, and Fig. 3 is a sectional view of a bearing portion using a ball-centered bearing. , FIG. 4 is a cross-sectional view of a bearing using a ball-centered bearing having an outer diameter different from that of the ball-centered bearing, and FIG. 5 is a cross-sectional view of a bearing using a ball bearing.

Reference numeral 1c designates a bracket A, which is provided with a bearing section consisting of a conical protrusion in the center in which the ball bearing 2 is housed, and a cylindrical part into which an outer ring of a ball bearing having a diameter larger than the conical protrusion is press-fitted. There is. A bearing holder 3b is fixed to the spherical bearing 2, the bearing holder 3b, the oil pot A4, and the bracket A1c. Similarly 5a
is the bracket B with the ball center bearing 2 and the bearing holder 3.
b. Oil pot A4 is fixed. Reference numeral 7a denotes a thrust washer, which is fixed to the shaft 6 and forms one thrust mechanism with the oil pot A4. The thrust ball 8 contacts the center hole of the shaft 6 and the thrust ball receiving plate 9 to form the other thrust mechanism.

The rotor 10 is fixed to the shaft 6, and the rotor 10
A stator 11 is positioned with a certain gap between the stator 11 and the bracket A1c and the bracket B5a are fixed with through bolts 12 with both end surfaces and outer diameters of the stator 11 being fitted.

Next, the operation of the bearing portion of the small electric motor of the present invention having the above configuration will be explained. As the rotor 10 rotates, the shaft 6, thrust washer 7a, and thrust ball 8 rotate together. On the other hand, the bracket A1c and the ball center bearing 2 are connected to the bracket 1c as shown in FIG.
The spherical bearing 2, bearing holder 3b, and oil pot A4 are fixed to the bracket A1c and support the shaft 6. The same applies to bracket B5a.

Next, the structure of the bearing section provided with the oil pot shown in FIG. 2 will be explained. Ball center bearing 2, bearing holder 3b and oil pot A
4 is fixed to the bracket B5a. The oil drainer 13 is fixed to the shaft 6. 14a is oil pot B
This oil pot B14a is fixed to the bracket B5a. To explain the operation of the bearing section having the above configuration, the shaft 6 and the oil drainer 13 rotate together.
On the other hand, the bracket B5a and the ball-centered bearing 2 are in contact with the straight line and arc of the conical part as shown in the figure, and the ball-centered bearing 2, bearing holder 3b, and oil pot A4 are fixed to the bracket B5a and support the shaft 6. ing.

Next, to explain the configuration of FIG. 3, the spherical bearing 2a
The bearing holder 3c and oil pot A4 are attached to the bracket A.
It is fixed at 1c. The thrust ball 8 is inserted into a center hole at the end of the shaft and is in contact with a thrust ball receiving plate 9, and this thrust ball receiving plate 9 is in contact with a bracket A1c. The operation in this case is axis 6
The thrust ball 8 and the thrust ball 8 rotate together and slide on the contact surface with the thrust ball receiving plate 9.

Next, to explain the configuration of FIG.
It is attached to c. The thrust ball 8 is inserted into the center hole at the end of the shaft and is in contact with a thrust ball receiving plate 9, which is in contact with the bracket 1c.

Further, the structure of the bearing section using ball bearings will be explained with reference to FIG. 5. The ball bearing 2b is inserted into the shaft 6a, fixed with a retaining ring 16, and inserted into the bracket A1c. In this case, the bracket A1c and the outer ring of the ball bearing 2b are stationary, and the shaft 6a, the retaining ring 16, and the inner ring of the ball bearing 2b rotate together.

By making the shape of the bearing provided in the center of the bracket concentric with the conical protrusion and the cylindrical part having a larger diameter than the conical protrusion and connected by the lower end of the protrusion and the flat plate part, Both spherical bearings and ball bearings can be used, and fasteners such as rivets are not required when fixing the oil pot.

Furthermore, by forming the conical protrusion, the same bracket can be used even if the outer diameter of the spherical bearing is different, since a space is provided between the spherical bearing and the cylindrical part. An oil retaining material such as felt can be provided between the bearings, and the life of the ball-centered bearing can be made longer than that of conventional bearings.

As described above, since ball bearings and ball-centered bearings with different outer diameters can be used in the same bracket, it is possible to standardize the bracket and provide a small electric motor at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric motor in one embodiment of the present invention, FIG. 2 is a sectional view of a bearing in another embodiment of the invention, and FIG. 3 is a sectional view of a bearing in another embodiment of the invention. Figure 4 is a cross-sectional view of a bearing in an embodiment of the present invention using a ball-centered bearing with an outer diameter different from that of the ball-centered bearing, Figure 5 is a cross-sectional view of a bearing using a ball bearing, and Figure 6 is a conventional bearing. 7 is a partial front view of the motor, FIG. 8 is a sectional view of the motor, and FIGS. 9 to 12 are sectional views of the bearing portion. 1c...Bracket A, 2...Ball center bearing, 2a
...Ball center bearing having a different outer diameter from 2, 2b...Ball bearing, 5a...Bracket B, 14a...Oil pot.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In the center of the bracket, a conical protrusion projecting outward into which a ball-centered bearing is housed, a lower end of the protrusion, and a flat plate portion with a diameter larger than that of the conical protrusion. A small electric motor having a bearing part that is concentrically provided with a cylindrical part into which the outer ring of a ball bearing is directly press-fitted. (2) The small electric motor according to claim 1 of the utility model registration claim, which has an oil pot fixed to the outside of the cylindrical part.