JP3317859B2 - Manufacturing method of bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports both radial and thrust loads on a rotating shaft.
The present invention relates to a method for manufacturing a bearing .

[0002]

2. Description of the Related Art Conventionally, a sintered oil-impregnated bearing has been known as one of slide bearings for receiving a load in a radial direction. Such a sintered oil-impregnated bearing is porous, and an oil film can be formed between the impregnated oil and the rotating shaft by oozing out. Therefore, it is used as a bearing that can be lubricated without lubrication.

A bearing using the above-described sintered oil-impregnated bearing and capable of supporting loads in both the radial direction and the thrust direction is described in Japanese Utility Model Laid-Open Publication No. Hei 5-3633.

FIG. 4 is a diagram described in the above-mentioned publication, in which a bearing device 1 includes a housing 2 and a sintered oil-impregnated body 3 fixed to a lower end of the inner periphery of the housing 2. Have been. In the drawings, reference numeral 4 denotes a rotating shaft to be supported, and reference numeral 5 denotes a collar integrally fixed to the rotating shaft 4. The collar 5 has a transfer groove 5a. The ball bearing 6 arranged in the transfer groove 5a is also a component of the bearing device 1.

In the bearing device 1, the radial load is applied by the sintered oil-impregnated body 3 because the oil seeps out of the sintered oil-impregnated body 3 and forms an oil film with the outer peripheral surface of the rotating shaft 4. Can be supported. The load in the thrust direction is such that oil oozing out of the sintered oil impregnated body 3
To reduce the frictional resistance between the sintered oil-impregnated body 3 and the ball 6 and between the ball 6 and the inner surface of the transfer groove 5a.

[0006]

However, in the bearing device 1, the sintered oil-impregnated body 3 attached to the housing 2 and the ball 6 arranged on the shaft 4 are constituent elements. However, there is a problem that the assembling work is difficult. The oil is supplied to the ball 6 only through the contact point between the sintered oil-containing body 3 and the ball 6. In comparison, the contact area between the ball 6 and the inner surface of the transfer groove 5a is considerably large. Therefore, depending on the situation, there is a possibility that the oil is not supplied enough to sufficiently reduce the frictional resistance between the ball 6 and the inner surface of the transfer groove 5a.

The present invention has been made in view of the above circumstances, and is capable of supporting both a radial load and a thrust load applied to a rotating shaft, and of course, has a simplified configuration and can be manufactured and assembled. To provide a bearing that can easily supply oil and supply sufficient oil.
It is an object of the present invention to provide a method capable of easily manufacturing a bearing as described above .

[0008]

A bearing according to claim 1 is manufactured.
In the manufacturing method, the sintered and oil-impregnated sintered oil-impregnated
A cylindrical body and a plurality of spheres incorporated in the sintered oil-impregnated cylindrical body
And a radial direction on a rotating shaft having a step portion.
Manufacture bearings that support both axial and thrust loads
A method for producing the sintered oil-impregnated cylindrical body.
Outer peripheral surface of the rotating shaft provided on the inner peripheral surface on one end side
First radial bearing portion that slides on and supports the rotary shaft
And provided on the other end side in the axial direction of the sintered oil-impregnated cylindrical body.
A recess opening to both the end face and the inner face;
Forming a wall of the recess and the sphere being disposed in the recess;
Sometimes an overhang to prevent the sphere from popping out,
Forming a wall of the recess and projecting outward from the end face.
A sintered oil-impregnated cylindrical body having
In the recess of the sintered oil-impregnated cylinder, the plurality of spheres are
The projecting wall is positioned inward in the radial direction.
, The plurality of spheres are fired.
Project radially inward from the inner surface of the oil-impregnated cylindrical body and
Store so that it protrudes axially outward from the end face of the oil-impregnated cylindrical body.
It is characterized in that a peripheral groove for accommodating is formed.

According to the first aspect of the present invention, the projecting wall has a diameter.
When pressed inward in the direction, the protruding wall
Deforms radially inward to prevent jumping out. Yo
Therefore, the sphere disposed in the circumferential groove is prevented from jumping out by easy means.
Is stopped. The bearing manufactured in this way is axially aligned.
On the end side and the other end side, the first and second
2 radial bearings support radial load
I do. In the first radial bearing portion, the sintered oil-impregnated circle
The inner peripheral surface of the cylinder is exposed to oil oozing from the sintered oil-impregnated cylinder.
An oil film is formed between the rotating shaft and
Carry on. Also, in the second radial bearing portion,
A plurality of spheres arranged in the groove and projecting radially inward
On the other hand, oil is supplied from a sintered oil-impregnated cylinder,
Rolls on the outer peripheral surface of the rotating shaft through the oil film by lubrication
Support with low resistance by sliding or sliding.
The load in the thrust direction is supported axially from the end face.
Thrust bearing composed of a plurality of spheres protruding in the direction
Made by the department. In the thrust bearing part, in the circumferential groove
Spheres arranged on the other hand are either sintered oil-impregnated cylinders
On the other hand, on the lower surface of the step of the rotating shaft
To roll or slip through the oil film by refueling
Support with less resistance. In this case, installed in the circumferential groove
The sphere is used as the second radial bearing portion and the thrust shaft.
The structure is simple because it serves as both the receiving part.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a bearing manufactured by the method for manufacturing a bearing according to the present invention .
Shows one embodiment of a granulated by bearing, in FIG. 1, the bearing 11 is configured to include an oil-impregnated sintered cylindrical body 20, the sphere 30.

The sintered oil-impregnated cylindrical body 20 is formed by compressing a powder into a predetermined shape using a mold and then sintering the powder. The sintered oil-impregnated cylindrical body 20 will be subjected to oil-impregnation in the subsequent steps.
A description will be given of the manufacturing method. In the present invention, suitable materials include, for example, Cu-Sn-based, Fe-Cu-based,
There are Fe type, stainless type, and the like. Sintered oil impregnated cylinder 20
The inner peripheral surface located at one end in the axial direction is a first radial bearing portion 21 that slides on the outer peripheral surface of the rotating shaft A to support the rotating shaft A. On the other end side of the sintered oil-impregnated cylindrical body 20, a circumferential groove 24 that opens to both the end face 22 and the inner face 23 is formed. An overhang 23a is formed on the inner peripheral side wall of the peripheral groove 24. In addition, the circumferential groove 24
Is formed on an outer peripheral side wall portion of the sphere 30 to prevent the sphere 30 from flying out. Also, at the bottom of the circumferential groove 24,
An oil reservoir recess 23b having an annular concave shape is formed.

The sphere 30 is formed of a relatively hard material such as a steel ball or a ceramic ball.
It is arranged in the circumferential groove 24. In this case, the sphere 30
Multiple objects are arranged without gaps. The sphere 30
Is in a state of projecting radially inward from the inner surface 23 of the sintered oil-impregnated cylindrical body 20 and at the end face 22 of the sintered oil-impregnated cylindrical body 20.
And it is accommodated in the circumferential groove 24 in a state protruding outward in the axial direction from the protrusion preventing portion 25. In this case, the plurality of spheres 30 project radially inward from the inner surface 23 of the sintered oil-impregnated cylindrical body 20 to constitute a second radial bearing portion that supports the outer peripheral surface of the rotating shaft A, Further, the thrust bearing portion which supports the collar A1 (step portion) of the rotating shaft A is formed by projecting axially outward from the end surface 22 of the sintered oil-impregnated cylindrical body 30 and the projection preventing portion 25. Also,
The amount of projection of the plurality of spheres 30 from the inner surface 23 is set so that the envelope of the tip on the inner peripheral side of the sphere 30 is located on an extension of the surface formed by the first radial bearing portion 21.

In the bearing 11 having the above configuration, the first and second radial bearing portions can support the load in the radial direction at one end and the other end in the axial direction. In the first radial bearing portion 21, the inner peripheral surface of the sintered oil-impregnated cylindrical body 20 forms an oil film between itself and the outer peripheral surface of the rotating shaft A by oil oozing out of the sintered oil-impregnated cylindrical body 20, and a small rotation occurs. Support with resistance. In the second radial bearing portion constituted by the sphere 30, the plurality of spheres 30 arranged in the circumferential groove 24 are supplied with oil from the sintered oil-impregnated cylindrical body 20 on the one hand, and on the other hand, By rolling or slipping on the outer peripheral surface of the rotating shaft A via an oil film formed by lubrication, the support is performed with a small resistance in a double sense.

The support of the load in the thrust direction can be performed by a thrust bearing portion. In the thrust bearing portion constituted by the spherical body 30, a plurality of spherical bodies 30 disposed in the circumferential groove 24 are supplied with oil from the sintered oil-impregnated cylindrical body 20 on the one hand, and the collar of the rotating shaft A on the other hand. A1 Rolls or slips on the underside of the lubricating oil film to provide support in a double sense with low resistance.

As described above, in the bearing 11, the sphere disposed in the circumferential groove also serves as both the second radial bearing portion and the thrust bearing portion.
It can be easily manufactured and assembled.

In this case, the sintered oil-impregnated cylindrical body 20 contains a sufficient amount of oil because it is a large bulk body, as apparent from comparison with the sintered oil-impregnated body 3 in FIG. A sufficient amount of oil can be supplied to the first and second radial bearings and the thrust bearing. In addition, since the spherical body 30 is disposed in the circumferential groove 24 with a large contact area with the inner surface of the circumferential groove 24, a sufficient oil supply can be enjoyed.

Since the bearing 11 has such an effect, it can be used for an audio / VTR device, office equipment,
The present invention can be effectively applied to the rotation shafts of various motors such as a capstan motor, a spindle motor, and a micro motor in industrial equipment and the like, or the rotation shafts of other members. Needless to say, the present invention may be applied to support of any other rotating shaft.

The bearing 11 has a self-lubricating property. That is, a sufficient amount of oil can be supplied to the first and second radial bearings from the sintered oil-impregnated cylindrical body 20 containing oil in its own bulk.

The bearing 11 is noiseless. That is, the sliding noise generated on the sliding surface (the inner surface of the first radial bearing portion 21) can be absorbed by attenuating the vibration because the sintered oil-impregnated cylindrical body 20 is a porous body. Such a vibration damping function is also effective against the rolling sound of the sphere 30 in the second radial bearing portion, and the rolling sound of the sphere 30 can be effectively attenuated and silenced. As a result, the bearing 11 is noiseless.

The bearing 11 contributes to space saving. That is, the first radial bearing portion 21 only needs to have a sliding surface. Further, in the second radial bearing portion, it is only necessary to dispose the sphere 30 in the circumferential groove 24. Therefore, the number of parts can be reduced, which contributes to space saving.

Further, since the oil groove recess 23b is formed in the circumferential groove 24, excess oil can be stored, and unnecessary oil can be prevented from flowing out unnecessarily. Further, oil can be supplied from the oil reservoir recess 23b to the sphere 30 as needed.

Next, a method of manufacturing the bearing 11 will be described.
This will be described with reference to FIG.

First, a first radial bearing portion 21 (shown in FIG. 1) formed on the inner peripheral surface at one end in the axial direction and an opening on both the end surface 22 and the inner surface 23 at the other end are provided. A recess 26, an overhang 23 a that forms a wall of the recess 26 and prevents the sphere 30 from flying out when the sphere 30 is disposed in the recess 26, and a wall of the recess 26. And a protruding wall 27 protruding outward from the end face 22 is prepared.

The recess 26 of the sintered oil-impregnated cylindrical body 20 '
A plurality of spheres 30 are arranged inside. Further, the projecting wall 27 is deformed by pressing the projecting wall 27 inward in the radial direction by using a mold 40 having a conical surface 40a as shown in the figure, thereby forming the projection preventing portion 25. The circumferential groove 24 for accommodating the plurality of spheres 30 is formed. Finally, the entire bearing 11 is placed in a vacuum state to be oil-impregnated. Thereby, the manufacture of the bearing 11 is completed.

According to this manufacturing method, the sintered oil-impregnated cylindrical body 2
0 ′ is provided with an overhang 23a,
When arranging a plurality of spheres 30 in 6, the spheres 30 can be prevented from jumping out of the recesses 26. Further, by pressing the projecting wall 27 radially inward, the projecting wall 27 is deformed radially inward, and
Is formed to prevent the sphere 30 from flying out. Therefore, it is possible to prevent the sphere disposed in the circumferential groove 24 from flying out by easy means.

Note that the present invention is not limited to the above-described embodiment, but may be configured as follows. a) As shown in FIG. 1, instead of using the sphere 30 at the upper part of the bearing, the sphere 30 is turned upside down.
To be used at the bottom of the bearing. b) Instead of applying the bearing 11 to the rotating shaft A having a step portion made of a collar A1 as shown in FIG.
The present invention is applied to a rotating shaft A having a step portion having an enlarged diameter portion A2 as shown in FIG. Alternatively, the present invention is applied to a rotating shaft having a step portion having an arbitrary shape. c) Instead of vacuum-impregnating the sintered oil-impregnated cylindrical body 20, another arbitrary oil-impregnation method such as immersion is applied. d) Instead of impregnating the bearing 11 after assembling it, impregnating it at any time. e) The sphere 30 is made of an arbitrary material. f) Instead of arranging the plurality of spheres 30 in the circumferential groove 24 without a gap, arranging the spheres 30 with a gap allowed. g) Instead of the first radial bearing 21, a radial bearing composed of a sphere is used. h) As a method of disposing the sphere 30 in the circumferential groove 24, instead of adopting the method shown in FIG.
Pressing inside.

[0028]

According to the method for manufacturing a bearing of the present invention, the following effects can be obtained. The method for manufacturing a bearing according to claim 1.
For example, by pressing the projecting wall radially inward,
The protruding wall is deformed toward the radial bulletin to make the sphere fly out.
Can be blocked. Therefore, the ball arranged in the circumferential groove
Jumping out of the body can be prevented by easy means. The present invention
Bearings manufactured according to the bearing manufacturing method of
Sphere formed as a second radial bearing portion and a thrust bearing
Part is simple, the structure is simple,
And assembly can be performed easily. And the sphere is
Installed in the circumferential groove with a large contact area with the groove inner surface
Therefore, a sufficient oil supply can be received.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the bearing of the present invention.

FIG. 2 is an explanatory diagram for explaining a method of manufacturing the bearing shown in FIG.

FIG. 3 is a sectional view showing another usage state of the bearing shown in FIG. 1;

FIG. 4 is a cross-sectional view illustrating a configuration example of a conventional bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Bearing 20 Sintered oil-impregnated cylinder 20 'Sintered oil-impregnated cylinder 21 First radial bearing part 22 End surface 23 Inner surface 23a Overhanging part 24 Peripheral groove 26 Concave 27 Protrusion wall 30 Spherical body A Rotation axis A1 collar (step part) A2 Large diameter part (step)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuneo Maruyama 3-1, Koganecho, Niigata City, Niigata Mitsubishi Materials Real Co., Ltd. Niigata Works (72) Inventor Masio Arai 6-4-29 Hommachi Nishi, Yono-shi, Saitama In Showlight Co., Ltd. (72) Isao Tsuchida, Inventor 6-4-29, Honcho Nishi, Yono-shi, Saitama Prefecture In-Showlight Co., Ltd. (56) References Hikaru 5-3633 (JP, U) 63-147925 (JP, U) Fully open Showa 53-101138 (JP, U) Fully open Showa 62-819 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16C 17/00 -27/08 F16C 33/00-33/66

Claims (1)

(57) [Claims] 1. A sintered and oil-impregnated sintered oil-impregnated circle
A cylindrical body, and a plurality of spheres incorporated in the sintered oil-impregnated cylindrical body;
In the radial direction on the rotating shaft having the step.
Manufacture bearings that support both axial and thrust loads.
A method for Provided on the inner peripheral surface at one axial end side of the sintered oil-impregnated cylindrical body
The sliding shaft comes into sliding contact with the outer peripheral surface of the rotating shaft to support the rotating shaft.
A first radial bearing portion, Provided on the other axial side of the sintered oil-impregnated cylindrical body,
A recess opening to both the end face and the inner face, A wall of the recess, and wherein the sphere is disposed in the recess;
An overhang to prevent the sphere from popping out when Forming a wall of the recess and projecting outward from the end face
A sintered oil-impregnated cylindrical body having a projecting wall and In the recess of the sintered oil-impregnated cylindrical body, the plurality of spheres,
Locked and arranged on the overhang, By pressing the protruding wall radially inward,
The plurality of spheres are radially moved from the inner surface of the sintered oil-impregnated cylindrical body.
Projecting inward and axially from the end face of the sintered oil-impregnated cylinder
Forming a circumferential groove to house outwardly
The method of manufacturing bearings.