JPH02246756A - Axial gap type motor and bearing therefor - Google Patents

Abstract

PURPOSE:To improve load withstanding performance by arranging a radial load bearing and an axial load bearing independently. CONSTITUTION:When a radial load bearing 10 and an axial thrust load bearing 16 comprising small balls are arranged independently, radial load applied onto a shaft 6 is held by a sliding bearing 10. Axial thrust load produced through magnetic attraction functioning between a magnet 3 and an iron substrate 9 is held by small balls 16 and the planar sections of the sliding bearing 10 and a pulley 5. Since the small balls 16 are held rotatably in the holes of a retainer 15, rolling contact is made between the small balls 16 and the planar sections of the sliding bearing 10 and the pulley 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for receiving axial thrust (magnetic attraction force) in an axial gap type motor using a simple means instead of a ball bearing.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 60-219953, conventional devices use ball bearings only on the side receiving axial thrust to reduce the cost of the bearing portion.

[Problem to be solved by the invention]

Although the above conventional technology reduces the amount of expensive ball bearings used, it still uses one.

This was insufficient in terms of cost reduction.

An object of the present invention is to provide an inexpensive bearing that can receive axial thrust without using expensive ball bearings.

(Means for Solving the Problems) The above object is achieved by separately installing a radial load bearing and an axial thrust load bearing.

[For production]

In other words, for the radial load, we used a pair of sliding bearings, which are conventionally available at low cost, and for the axial thrust load, we held multiple small balls between the stator and rotor using plastic, etc. so that they could rotate freely. By installing this material, a bearing with good load-bearing performance can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 1 indicates a rotor, which includes a wide-mouthed cylindrical case 2 with a bottom made of a magnetic material, and the case 2.
A torque generating magnet 3 is attached to the bottom of the case 2 in the form of a ring disk and is magnetized in the axial direction. A signal generating magnet 4 is attached to the outer circumferential surface of the case 2 by outsert etc. A pulley 5 with a belt groove that is fitted and fixed, and a shaft 6 that is press-fitted into the center hole of the pulley 5.
It becomes more. Reference numeral 7 indicates a stator, and the stator has a coil 8 wound with a conductor such as a magnet wire, for example, the surface of an iron plate is insulated, copper foil is pasted, and a necessary electrical conduction circuit is provided by etching or the like, so-called. Mounted on iron board 9 with a pair of sliding bearings.

For example, the bearing portion 12 includes a sintered oil-impregnated alloy bearing 10 and a housing 11 that holds the bearing 1o. 13 is an MR sensor whose resistance changes when subjected to a magnetic field, and 14 is an M
This is an insulating holder that holds the R sensor 13 and is made of, for example, plastic containing glass fiber. Reference numeral 15 denotes a ring-shaped disk retainer made of plastic such as polyacetal, and a plurality of appropriately provided holes are filled with small balls, such as steel balls 1 used in ball bearings.
6 are fitted so as to be rotatable. 17 is a washer installed to receive the small ball 16 on a surface different from that of the bearing 10, for example, a washer made of a hardened and surface-ground copper plate;
Alternatively, it is a plastic plate such as polyacetal.

In the axial gap type motor constructed as described above, the stator 7 includes an iron substrate 9 fixed to the housing 11 of the bearing portion 12 with screws (not shown) or the like. The rotor 1 is rotatably supported between the bearing 10 and the pulley 5 via a small ball 16, and between the bearings 10, 10, thereby forming an axial gap type motor. The principle of rotation of the axial gap type motor constructed as in the present invention is already well known.
Since it is not directly related to the main text explanation, it is omitted.

In the axial gap type motor configured in this manner, the radial load applied to the shaft 6 is received by the inexpensive sliding bearings 10, 10.

Further, the axial thrust load generated by the magnetic attraction force between the magnet 3 and the iron substrate 9 is received by the small ball 16, the sliding bearing 10, and the flat portion of the pulley 5. At this time, since the wheel ball 16 is rotatably held in the hole of the beam tape 15, there is rolling contact between the small ball 17, the sliding bearing 10, and the flat surfaces of the pulley 5, which has the effect of minimizing wear. Further, when the sliding bearing 10 is made of a sintered oil-impregnated alloy, some oil oozes out and adheres to the surface of the small balls 16, which has the effect of further reducing wear. Nao small ball 16
Naturally, the cost of the retainer 15 is lower than that of the ball bearing.

The third wi is an embodiment in which the small balls 16 are received on a surface different from the sliding bearing 1o. For example, the washer 17 is made of a copper plate and the surface is hardened and ground, which is effective in improving durability. Also, those made of plastic such as polyacetal have the effect of reducing noise. At this time, better performance can be obtained by applying some grease to the surface of the small balls 16 or the holes in the retainer 1'5.

〔Effect of the invention〕

According to the present invention, it is possible to receive an axial thrust load in a simple manner without using effective ball bearings, which has the effect of reducing costs.

[Brief explanation of drawings]

Fig. 1 is a front vertical cross-sectional view showing one embodiment of the present invention, Fig. 2 is an enlarged view of the main parts of the invention, Fig. 3 is an enlarged view of the main parts showing another embodiment, and Fig. 4 is a retainer and the like. FIG. 3 is a front view showing a state in which the balls are combined. 1...Rotor, 5...Pulley, 7...Stator,
10... Slip bearing, 15... Retainer, 16...
・Small ball, 17... Urasha. Tail l mouth 2A

Claims (1)

[Claims] 1. In an axial gap type motor consisting of a rotor having an axially magnetized magnet and a stator with a coil bonded to an iron substrate, the radial load bearing and the axial load bearing are separately provided. An axial gap type motor characterized by being provided with. 2. The bearing for an axial gap type motor according to claim 1, wherein the radial load bearing uses an oil-impregnated bearing such as sintered material, and the axial load bearing uses small balls. 3. The bearing according to claim 2, wherein a plurality of the small balls are rotatably held in a holder and used in an assembly. 4. The bearing according to claim 2, wherein the small balls are in rolling contact with the end face of the sintered oil-impregnated bearing. 5. Claim 2, wherein the small balls are in rolling contact with the surface of a member other than the sintered oil-impregnated bearing.
Bearings listed.