JP2001165150A - Dynamic pressure bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing constituted to secure the roundness of the inner diameter surface of a synthetic resin sleeve even if fixing the synthetic resin sleeve to a housing by pressing it in. SOLUTION: A cylindrical receiving member 11 is fitted to the housing through a buffer member 15. The buffer member 15 is provided with a cylindrical part 13 parallel with the receiving member 11. One end of the cylindrical part 13 and one end of the receiving member 11 are integrally connected by a connection part 14. A cylindrical space is formed between the cylindrical part 13 and the receiving member 11. The cylindrical space is closed on one end side and opened on the other end side. When mounting the receiving member 11 to the housing, the cylindrical part 13 is deformed toward the cylindrical space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic pressure bearing used for, for example, a hard disk drive of a computer or a fan motor.

[0002]

2. Description of the Related Art Conventionally, stainless steel shafts and copper alloy sleeves have been used for dynamic pressure bearings used in hard disk drives and fan motors of computers. However, with the recent price reduction of computers, low cost dynamic pressure bearings are also required, and as a sleeve, a synthetic resin material that is easy to machine such as a dynamic pressure generating groove and has a low material cost is used. Sleeves are beginning to be widely used. In this synthetic resin sleeve, for example,
A thermoplastic polyphenylene sulfide resin (PPS) or a thermosetting epoxy resin having a small shrinkage and good moldability is used. And the synthetic resin sleeve,
The sleeve is mounted on the housing by press-fitting the sleeve into the housing.

[0003]

However, in the dynamic pressure bearing using the synthetic resin sleeve, when the synthetic resin sleeve is press-fitted into the housing, the interference between the inner diameter of the housing and the outer diameter of the sleeve is limited. Because of this, the synthetic resin sleeve is deformed. When the synthetic resin sleeve is deformed, there arises a problem that the roundness of the inner diameter surface of the synthetic resin sleeve, that is, the roundness of the inner diameter surface of the sleeve on which the dynamic pressure generating groove is formed cannot be sufficiently ensured.

If the roundness of the inner diameter surface of the synthetic resin sleeve cannot be ensured due to the deformation of the synthetic resin sleeve, the synthetic resin sleeve presses the shaft or a gap is formed between the synthetic resin sleeve and the shaft. Or the function of the dynamic pressure generating groove cannot be sufficiently exhibited. Therefore, in order to minimize the deformation of the synthetic resin sleeve, there is also a hydrodynamic bearing manufactured using a synthetic resin sleeve having a dimension in consideration of a deformation allowance in advance. However, even when the synthetic resin sleeve is used in consideration of the deformation allowance, it is very difficult to keep the deformation of the synthetic resin sleeve within a narrow allowable error range.

On the other hand, as a measure for preventing the deformation of the synthetic resin sleeve, there is a method of fixing the synthetic resin sleeve to the housing by bonding. In this fixing method by bonding,
Since there is no need to press-fit the synthetic resin sleeve into the housing, the sleeve is not deformed. Therefore, the above-mentioned problem of the roundness of the sleeve is solved. However, the method of fixing the sleeve made of synthetic resin by adhesion involves complicated steps in the application of the adhesive and the heating and drying, and also has a difficulty in handling the adhesive.

Accordingly, an object of the present invention is to provide a dynamic pressure bearing capable of easily ensuring the roundness of the inner diameter surface of the synthetic resin sleeve even when the synthetic resin sleeve is fixed to the housing by press fitting. .

[0007]

According to a first aspect of the present invention, there is provided a dynamic pressure bearing having a synthetic resin receiving member having a dynamic pressure groove formed therein. The receiving member is supported by a buffer member that does not substantially strain the receiving member.

According to the above construction, since the receiving member is supported by the buffer member that does not substantially strain the receiving member, the buffer member is not affected by an external force when the receiving member is mounted. Prevents the receiving member from being substantially deformed. Therefore, a decrease in the dynamic pressure generating function due to the deformation of the receiving member is prevented.

According to a second aspect of the present invention, in the dynamic pressure bearing according to the first aspect, the buffer member has a cylindrical portion integrally formed on an outer peripheral portion of the receiving member, and one end of the cylindrical portion. And one end of the receiving member are connected to form a cylindrical space between the cylindrical portion and the receiving member.

According to the above configuration, the cushioning member has a cylindrical portion formed integrally with the outer peripheral portion of the receiving member, and one end of the cylindrical portion is connected to one end of the receiving member. Since a cylindrical space is formed between the cylindrical portion and the receiving member, the cylindrical portion of the cushioning member has a cylindrical space against external force when the receiving member is mounted. Only the coupling portion is deformed, and the cushioning member prevents the receiving member from being substantially deformed.

According to a third aspect of the present invention, in the dynamic pressure bearing according to the first aspect, the buffer member has an inner cylindrical portion and an outer cylindrical portion formed integrally with the outer peripheral portion of the receiving member, One end of the inner cylinder is connected to one end of the receiving member, while the other end of the inner cylinder is connected to the other end of the outer cylinder, and the inner cylinder is connected to the inner cylinder. A cylindrical space is formed between the portion and the receiving member and between the inner cylindrical portion and the outer cylindrical portion.

According to the above construction, the cushioning member has the inner cylindrical portion and the outer cylindrical portion formed integrally with the outer peripheral portion of the receiving member, and has one end of the inner cylindrical portion and the receiving member. Is connected to the other end of the inner cylindrical portion and the other end of the outer cylindrical portion to connect between the inner cylindrical portion and the receiving member and to the inner cylindrical portion. Since a cylindrical space is formed between the portion and the outer cylindrical portion, a cylindrical space is provided for external force when the receiving member is mounted. Only the connecting portion is deformed, and the cushioning member prevents the receiving member from being substantially deformed.

In the cushioning member, the outer cylindrical portion and the inner cylindrical portion can be inclined and moved in the radial direction, respectively, to give the receiving member alignment.

According to a fourth aspect of the present invention, in the dynamic pressure bearing according to the first aspect, the cushioning member is formed separately from an outer peripheral portion of the receiving member and has an inner cylindrical portion externally fitted to the receiving member. , Having an outer cylinder portion, one end of the inner cylinder portion and one end of the outer cylinder portion are connected, and a cylindrical space is formed between the inner cylinder portion and the outer cylinder portion. It is characterized by being formed.

According to the above construction, the cushioning member has the inner cylindrical portion formed separately from the outer peripheral portion of the receiving member and externally fitted to the receiving member, and the outer cylindrical portion. Is connected to one end of the outer cylinder part, so that a cylindrical space is formed between the inner cylinder part and the outer cylinder part. Due to the cylindrical space, only the cylindrical portion of the cushioning member and the connection portion thereof are deformed by the force from, and the cushioning member prevents the receiving member from being substantially deformed. Further, since the cushioning member is provided separately from the receiving member, it is easy to handle and can be easily replaced with another different cushioning member.

According to a fifth aspect of the present invention, in the dynamic pressure bearing according to the first aspect, the buffer member is formed separately from the outer peripheral portion of the receiving member, and the inner cylindrical portion externally fitted to the receiving member. , A middle cylinder portion and an outer cylinder portion, and one end of the inner cylinder portion and one end of the middle cylinder portion are connected, while the other end of the middle cylinder portion and the outer cylinder The other end of the portion is connected to form a cylindrical space between the inner cylinder portion and the middle cylinder portion and between the outer cylinder portion and the middle cylinder portion. And

According to the above configuration, the cushioning member has the inner cylindrical portion, the middle cylindrical portion, and the outer cylindrical portion formed separately from the outer peripheral portion of the receiving member and externally fitted to the receiving member. The one end of the inner cylinder portion and one end of the middle cylinder portion are connected, while the other end of the middle cylinder portion and the other end of the outer cylinder portion are connected, Since a cylindrical space is formed between the tubular portion and the middle tubular portion and between the outer tubular portion and the middle tubular portion, respectively, against external force when the receiving member is mounted, Only the outer cylinder portion and the middle cylinder portion of the cushioning member are deformed, and the cushioning member prevents the receiving member from being substantially deformed.

Further, the cushioning member allows the outer tube portion and the middle tube portion to move inclining in the radial direction, respectively, so that the receiving member is provided with alignment.

Further, since the buffer member is provided separately from the receiving member, it can be easily replaced with a different buffer member.

According to a sixth aspect of the present invention, in the dynamic pressure bearing according to the first aspect, the buffer member is a wavy elastic ring-shaped member provided on an outer peripheral portion of the receiving member.

According to the above configuration, the cushioning member is a corrugated elastic ring-shaped member provided on the outer peripheral portion of the receiving member. Therefore, when the receiving member is mounted, only the corrugated elastic ring-shaped member of the cushioning member is deformed. Thus, the corrugated elastic ring-shaped member prevents the receiving member from being substantially deformed.

According to a seventh aspect of the present invention, in the dynamic pressure bearing according to the sixth aspect, the corrugated elastic ring-shaped member is such that a convex portion forming a corrugated shape as viewed from the outside in the radial direction is inclined in one circumferential direction. It is characterized by having.

According to the above configuration, the elastic ring-shaped member having the waveform is formed such that the convex portion forming the waveform as viewed from the outside in the radial direction is inclined in one circumferential direction, so that the receiving member rotates in one circumferential direction. In this case, a larger rotation suppressing effect can be obtained.

According to an eighth aspect of the present invention, in the dynamic pressure bearing according to the first aspect, the buffer member is an elastic ring-shaped member having cut-and-raised claws.

According to the above configuration, since the cushioning member is an elastic ring-shaped member having a cut-and-raised claw, only the cut-and-raised claw of the buffer member is deformed by an external force when the receiving member is mounted. The elastic ring-shaped member having the cut-and-raised claw prevents the receiving member from being substantially deformed.

Further, even when the elastic ring-shaped member is mounted by light press-fitting, the cut-and-raised claw makes the fixing of the receiving member firm, and the fixing is easy and easy to assemble.

According to a ninth aspect of the present invention, in the dynamic pressure bearing according to the eighth aspect, the elastic ring-shaped member has the cut-and-raised claws on both the inner peripheral side and the outer peripheral side. Features.

According to the above configuration, since the elastic ring-shaped member has the cut-and-raised claws on both the inner peripheral side and the outer peripheral side, the elastic ring-shaped member is not affected by external force when the receiving member is mounted. The cut-and-raised claw cut and raised on the inner peripheral side and the cut and raised claw cut and raised on the outer peripheral side are deformed, and the elastic ring-shaped member having the cut-raised claw prevents the receiving member from being substantially deformed. . In addition, the elastic ring-shaped member is securely attached to both the housing and the receiving member by both the cut-and-raised claws.

According to a tenth aspect, in the dynamic pressure bearing according to the eighth or ninth aspect, the cut-and-raised claw is formed in a direction parallel to an axial direction of the elastic ring-shaped member. I have.

According to the above configuration, since the cut-and-raised claw is formed in the direction parallel to the axial direction of the elastic ring-shaped member, the elastic ring-shaped member is prevented from moving in the direction parallel to the axial direction. .

According to an eleventh aspect of the present invention, in the dynamic pressure bearing according to the eighth or ninth aspect, the cut-and-raised claw is inclined with respect to the axial direction and the circumferential direction of the elastic ring-shaped member. And

According to the above configuration, since the cut-and-raised claw is inclined with respect to the axial direction and the circumferential direction of the elastic ring-shaped member, the elastic ring-shaped member moves in both the circumferential direction and the axial direction. Can be prevented.

According to a twelfth aspect of the present invention, in the dynamic pressure bearing according to any one of the first to eleventh aspects, the receiving member has a flange for restraining the cushioning member in the axial direction. Features.

According to the above configuration, since the receiving member has the flange for restraining the cushioning member in the axial direction, the cushioning member is prevented from moving in the axial direction.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

FIG. 1 is a perspective view of a dynamic pressure bearing according to a first embodiment of the present invention. In FIG. 1, the dynamic pressure bearing has a receiving member 11, and a herringbone-shaped dynamic pressure generating groove 12 is formed on an inner peripheral surface of the receiving member 11. In this dynamic pressure bearing, a cushioning member 15 including a cylindrical portion 13 and a connecting portion 14 is provided integrally with the receiving member 11. The receiving member and the cushioning member 15 have a small shrinkage and excellent moldability.
For example, a polyphenylene sulfide resin or a thermosetting epoxy resin is used.

More specifically, a cylindrical portion 13 is provided on the outer peripheral side of the cylindrical receiving member 11 in parallel with the receiving member 11.
And one end of the cylindrical portion 13 and the receiving member 1 are provided.
One end of the first member 1 is integrally connected by a connecting portion 14. On the other hand, the other end of the cylindrical portion 13 and the other end of the receiving member 11 are not connected. The cylindrical part 1
A cylindrical space is formed between 3 and the receiving member 11. The cylindrical space is closed at one end and open at the other end. The outer diameter of the connecting portion 14 is slightly smaller than the outer diameter of the cylindrical portion 13, and the outer peripheral portion 14a of the connecting portion 14 and the outer peripheral portion 13 of the cylindrical portion 13 are processed.
A step 16 is formed between the gap 16 and a.

Next, the operation when the receiving member 11 and the cushioning member 15 having the above-mentioned structures are attached to the cylinder hole of the housing (not shown) will be described.

The diameter of the cylinder hole of the housing is made smaller than the outer diameter of the cylindrical portion 13 integrally provided on the outer peripheral portion of the receiving member 11 by the amount of the interference. Also,
The outer diameter of the connecting portion 14 integrally connected to one end of the receiving member 11 and one end of the cylindrical portion 13 is made smaller than the inner diameter of the housing. Therefore, when the receiving member 11 is inserted into the housing, the connecting portion 14 is initially provided.
Is smaller than the inner diameter of the housing, so that the connecting portion 14 is easily inserted into the housing. Therefore, no pressure is applied to the receiving member 11 and the receiving member 1
No deformation occurs at 1.

Further, when the receiving member 11 is inserted into the housing, the outer peripheral surface of the cylindrical portion 13 is made smaller than the inner peripheral surface of the housing by the amount of interference, so that the cylindrical portion 13 is formed.
And the inner peripheral surface of the housing are in contact with each other. And
When the receiving member 11 is further pressed into the housing, the inner peripheral surface of the housing presses the outer peripheral surface of the cylindrical portion 13. At this time, the cylindrical portion 13 is deformed toward the cylindrical space by the pressing force of the housing. As described above, the deformation, that is, the distortion of the cylindrical portion 13 is not transmitted to the receiving member 11 because the space formed between the cylindrical portion 13 and the receiving member 11 is buffered.

In this embodiment, the cylindrical portion 13 is a cylinder having no slits (elongated cuts).
3 to absorb the radial deformation in
3 may be provided with a slit in the axial direction.

FIG. 2 shows a modification of the dynamic pressure bearing of FIG. In FIG. 2, the dynamic pressure bearing has a receiving member 21, and herringbone dynamic pressure generating grooves 22 are formed on the inner peripheral surface of the receiving member 21.
Is formed, and the cushioning member 27 including the inner cylindrical portion 23, the outer cylindrical portion 24, the inner connecting portion 25, and the outer connecting portion 26 is attached to the receiving member 2
1 are provided integrally.

More specifically, an inner cylindrical portion 23 is provided on the outer peripheral side of the cylindrical receiving member 21 in parallel with the receiving member 21.
The other end of the inner cylindrical portion 23 and the other end of the receiving member 21 are integrally connected by an inner connecting portion 25. However, one end of the inner cylindrical portion 23 and one end of the receiving member 21 are not connected. Therefore, a cylindrical space is formed between the inner cylindrical portion 23 and the receiving member 21. The cylindrical space is closed at the other end and open at one end.

An outer cylinder 24 is provided on the outer peripheral side of the inner cylinder 23 in parallel with the inner cylinder 23.
3 and one end of the outer cylindrical portion 24 are integrally connected by an outer connecting portion 26. The inner cylinder 23
Is not connected to the other end of the receiving member 21. Therefore, the inner cylindrical portion 23 and the outer cylindrical portion 24
A cylindrical space is formed between them. The cylindrical space is closed at one end and open at the other end.

The operation when the receiving member 21 and the cushioning member 27 are inserted into cylinder holes of a housing (not shown) will be described.

The inner diameter of the housing is the same as that of the receiving member 21.
Than the outer diameter of the outer cylindrical portion 24 provided integrally with the outer peripheral portion of
It is made smaller by the closing amount. Therefore, when the receiving member 21 is inserted into the housing, the outer peripheral surface of the outer cylindrical portion 24 is made smaller than the inner peripheral surface of the housing by the amount of interference, so that the outer peripheral surface of the outer cylindrical portion 24 is Contact with the inner peripheral surface of Then, the receiving member 21 is pressed by a press or the like.
Is pressed into the housing, the inner peripheral surface of the housing presses the outer peripheral surface of the outer cylindrical portion 24. At this time, the outer cylindrical portion 24 is deformed by the pressing force of the housing. However, the deformation of the outer cylinder 24 is deformed toward the space formed between the outer cylinder 24 and the inner cylinder 23, and the inner cylinder 23 is
The space formed between the inner cylindrical portion 23 and the receiving member 21 serves as a buffer, and the receiving member 21 is hardly deformed.

The inner cylindrical portion 23 and the outer cylindrical portion 24 are
Based on the inner connecting portion 25 and the outer connecting portion 26, respectively,
Can be tilted and moved in the radial direction. Therefore, the cushioning member 27
Can give the receiving member 21 alignment.

In the above embodiment, the inner cylindrical portion 23 and the outer cylindrical portion 24 are cylinders without slits.
Alternatively, a slit (not shown) may be provided in the outer cylinder portion 24 in the axial direction to absorb radial deformation of the inner cylinder portion 23 or the outer cylinder portion 24.

FIG. 3 shows a modification of the dynamic pressure bearing of FIG. As shown in FIG. 3, the dynamic pressure bearing has a receiving member 31, and a herringbone-shaped dynamic pressure generating groove 32 is formed on an inner peripheral surface of the receiving member 31. Further, a cushioning member 38 including the inner cylindrical portion 33, the middle cylindrical portion 34, the outer cylindrical portion 35, the inner connecting portion 36, and the outer connecting portion 37 is manufactured separately from the receiving member 31. The buffer member 38 press-fits the outer peripheral portion 31a of the receiving member 31 into the inner cylindrical portion 33 of the buffer member 38, and
It is attached to 1. Further, the receiving member 31 has flanges 31b and 31c for restraining the cushioning member 38 in the axial direction.

On the outer peripheral side of the inner cylindrical portion 33 of the buffer member 38, the middle cylindrical portion 34 is provided in parallel with the inner cylindrical portion 33, and the other end of the inner cylindrical portion 33 and the other end of the middle cylindrical member 35 are provided. Are integrally connected by an inner connecting portion 36. However, one end of the inner cylinder portion 33 and one end of the middle cylinder member 35 are not connected. Therefore, a cylindrical space is formed between the inner cylinder portion 33 and the middle cylinder member 35. The cylindrical space is closed at the other end and open at one end.

The outer cylinder 35 is provided on the outer peripheral side of the middle cylinder 34 in parallel with the middle cylinder 34, and one end of the middle cylinder 34 and one end of the outer cylinder 35 are provided. The ends are integrally connected by an outer connecting portion 37. However, the other end of the middle cylinder 34 and the other end of the outer cylinder 35 are not connected. Therefore, a cylindrical space is formed between the middle cylinder part 34 and the outer cylinder part 35. The cylindrical space is closed on one end side,
The other end is open.

When the receiving member 31 and the cushioning member 38 are attached to a housing (not shown), the distortion of the receiving member 31 is avoided as in the embodiment of FIG.

In FIG. 3, the flanges 31b and 31c are provided at both ends of the receiving member 31 to restrain the cushioning member 38 in the axial direction, but one of the flanges 31b is removable. I have.

The inner cylinder 33, the middle cylinder 34, and the outer cylinder 3
5 is provided with an axial slit (not shown), the slit absorbs radial deformation of the inner cylindrical portion 33, the middle cylindrical portion 34, and the outer cylindrical portion 35. 31
b, 31c may be integrally attached to the receiving member 31.

FIG. 4A is a sectional view of a dynamic pressure bearing according to an embodiment of the present invention. FIG. 4B is a front view of FIG. As shown in FIG. 4 (a), the cushioning member of this dynamic pressure bearing is formed of a corrugated elastic ring-shaped member 41 made of an elastic metal or resin. The elastic ring-shaped member 41 is formed separately from the receiving member 42 and is inserted between the receiving member 42 and the cylindrical housing 43. One end 41a of the elastic ring-shaped member 41 in the circumferential direction is
As shown in FIG. Of course, the one end 41a and the other end 41b may coincide with each other.

In the above configuration, the elastic ring-shaped member 41
Is inserted between the receiving member 42 and the housing 43, the elastic ring-shaped member 41 having elasticity presses the inner peripheral surface of the housing 43 and the outer peripheral surface of the receiving member 42, and The receiving member 42 is substantially fixed to the housing 43 via 41.

FIG. 5 shows a modification of FIG. FIG.
In the elastic ring-shaped member 51, the convex portion 51a forming the waveform, that is, the peak of the wave is inclined in one circumferential direction. The protrusion 51a is inclined in a clockwise direction indicated by an arrow C in FIG.

In the above configuration, the elastic ring-shaped member 51
Is inclined in the direction of arrow C, so that the elastic ring-shaped member 52 has an elastic ring shape with respect to the movement of the bearing 52 in the direction of arrow C as compared with the case where the convex portion 51a of the elastic ring-shaped member 51 is not inclined. The resistance of the member 51 increases. Therefore, the elastic ring-shaped member 51 allows the arrow C
A higher rotation suppression effect can be obtained for the rotation in the direction.

FIG. 6A is a longitudinal sectional view of a dynamic pressure bearing including a cushioning member according to the third embodiment, and FIG. 6B is a perspective view of the cushioning member. The cushioning member is formed of an elastic ring-shaped member 61, and the elastic ring-shaped member 61 is inserted into a gap between the dynamic pressure bearing 62 and the housing 63, as shown in FIG. As shown in FIG. 6B, the elastic ring-shaped member 61 has a sharply raised and raised claw 61a, and the cut and raised claw 61a is scale-like on one side in the axial direction on the outer peripheral side of the elastic ring-shaped member 61. Has been cut up.

In the above configuration, the elastic ring-shaped member 61
Is inserted into the gap between the receiving member 62 and the housing 63, the cut-and-raised claw 61a
1 is deformed in the radial direction, that is, the wall pressure direction. On the other hand, the cut-and-raised claw 61a bites into the inner peripheral surface of the housing 63, and the elastic ring-shaped member 61
The receiving member 62 is fixed to the housing 63 by the elasticity of 1a. Further, the force for moving the elastic ring-shaped member 61 is:
Even if it works on one side in the axial direction, the sharp tip of the cut-and-raised claw 61a bites into the inner peripheral surface of the housing 63, and the elastic ring-shaped member 61 cannot move (anchor effect). In other words, even when the elastic ring-shaped member 61 is mounted by light press-fitting, the sharp tip of the cut-and-raised claw 61a makes the receiving member 62 firmly fixed, and is easy to assemble and can be easily fixed.

FIG. 7A is a longitudinal sectional view of a modification of FIG. 6, and FIG. 7B is a perspective view thereof. As shown in FIG. 6 (a), the elastic ring-shaped member 71 serving as a cushioning member has sharply-raised claws 71a and 71b at the inner and outer peripheral sides, respectively. The raised nail 71a on the inner peripheral side is cut and raised in one axial direction of the elastic ring-shaped member 71, and the raised claw 71b on the outer peripheral side is cut and raised in the other direction of the axis.

In the above configuration, the elastic ring-shaped member 71
Is inserted into the gap between the receiving member 72 and the housing 73, the cut-and-raised claw 71a presses the inner peripheral surface of the housing 63, and the cut-and-raised claw 71b presses the outer peripheral surface of the receiving member 62. Thus, the elastic ring-shaped member 71
Due to the elasticity of the cut-and-raised claws 71a and 71b, the receiving member 7
2 is fixed to the housing 73. Further, even if the force for moving the elastic ring-shaped member 71 acts in either of the axial directions, the sharp tip of either of the cut-and-raised claws 71 a, 71 b may cause the inner peripheral surface of the housing 73 or the outer peripheral surface of the receiving member 72. The elastic ring-shaped member 71 cannot move in any of the axial directions.

FIG. 8 is a perspective view of a modification of the cushioning member shown in FIG. As shown in FIG. 8, the elastic ring-shaped member 81 serving as a cushioning member has a sharply-raised claw 81a with a sharp tip on the outer peripheral side. The cut-and-raised claw 81b is provided at an angle of 45 degrees with respect to the axial direction.

In the above configuration, the elastic ring-shaped member 81
The cut-and-raised claw 81a cuts into a housing (not shown) due to its elasticity, and fixes the receiving member to the housing without deformation. The cut-and-raised claw 81b
Is provided at an angle of 45 degrees with respect to the axial direction. Therefore, even if the force for moving the elastic ring-shaped member 61 acts in the axial or circumferential direction, the sharp tip of the cut-and-raised claw 61a is not shown. The elastic ring-shaped member 61 cannot move in either the axial direction or the circumferential direction because it bites into the inner peripheral surface of the housing.

In the first to fourth embodiments, the material of the cushioning member may be a resin, a metal, or a composite material.

[0066]

As is clear from the above description, according to the dynamic pressure bearing of the first aspect of the present invention, the receiving member is supported by the cushioning member which does not substantially give a distortion, so that the receiving member is deformed. Can be prevented. Therefore, it is possible to prevent the dynamic pressure generating function from being reduced due to the deformation of the receiving member.

According to the dynamic pressure bearing of the second aspect of the invention, the cushioning member has a cylindrical portion integrally formed on the outer peripheral portion of the receiving member, and one end of the cylindrical portion and one of the receiving members. Are connected to each other to form a cylindrical space between the cylindrical portion and the receiving member, so that the cylindrical portion is deformed toward the cylindrical space, and the receiving member is substantially Deformation can be prevented.

According to the dynamic pressure bearing of the third aspect of the present invention, the buffer member includes the inner cylindrical portion formed integrally with the outer peripheral portion of the receiving member,
An outer tube portion, and connects one end of the inner tube portion to one end of the receiving member, and connects the other end of the inner tube portion to the other end of the outer tube portion. Since a cylindrical space is formed between the inner cylindrical portion and the receiving member and between the inner cylindrical portion and the outer cylindrical portion, an external force applied when the receiving member is mounted. On the other hand, by deforming the outer cylindrical portion and the inner cylindrical portion of the cushioning member toward the cylindrical space, it is possible to prevent the receiving member from being substantially deformed.

In the cushioning member, the outer cylinder portion and the inner cylinder portion can each be inclinedly moved in the radial direction, so that the receiving member can be provided with alignment.

According to the dynamic pressure bearing of the fourth aspect of the present invention, the cushioning member is formed separately from the outer peripheral portion of the receiving member, and includes the inner cylindrical portion externally fitted to the receiving member and the outer cylindrical portion. Has, by connecting one end of the inner cylinder and one end of the outer cylinder to form a cylindrical space between the inner cylinder and the outer cylinder, For external force when mounting the receiving member,
By deforming the outer cylindrical portion of the cushioning member toward the cylindrical space, it is possible to prevent the receiving member from being substantially deformed.

Further, since the cushioning member is provided separately from the receiving member, it can be easily replaced with a different cushioning member.

According to the dynamic pressure bearing of the fifth aspect of the present invention, the buffer member is formed separately from the outer peripheral portion of the receiving member, and the inner cylindrical portion and the middle cylindrical portion are fitted to the receiving member. Having an outer cylinder portion, while one end of the inner cylinder portion is connected to one end of the middle cylinder portion, while the other end of the middle cylinder portion and the other end of the outer cylinder portion are connected to each other. In connection with each other, a cylindrical space is formed between the inner cylinder portion and the middle cylinder portion and between the outer cylinder portion and the middle cylinder portion. With this force, the outer cylindrical portion and the middle cylindrical portion of the cushioning member are deformed toward the cylindrical space, so that the receiving member can be substantially prevented from being deformed.

Further, in the cushioning member, the outer cylinder portion and the middle cylinder portion can be inclinedly moved in the radial direction, respectively, so that the receiving member can be provided with alignment.

Further, since the buffer member is provided separately from the receiving member, it can be easily replaced with a different buffer member.

According to the dynamic pressure bearing of the sixth aspect of the present invention, since the cushioning member is provided with the corrugated elastic ring-shaped member on the outer peripheral portion of the receiving member, when the receiving member is mounted, the corrugated elastic ring-shaped member is provided. Only the ring-shaped member is deformed, and the corrugated elastic ring-shaped member can prevent the receiving member from being substantially deformed.

According to the hydrodynamic bearing of the present invention, since the corrugated elastic ring-shaped member has the convex portion forming the corrugated shape as viewed from the outside in the radial direction inclined in one circumferential direction, the receiving member has the above-mentioned configuration. When rotating in one circumferential direction, a greater rotation suppressing effect can be obtained. According to the dynamic pressure bearing of the present invention, since the cushioning member is provided with the elastic ring-shaped member having the cut-and-raised claw, the cushioning member is cut by the external force when the receiving member is mounted. The elastic ring-shaped member having only the raised claws deformed and the cut-raised claws can prevent the receiving member from being substantially deformed.

Further, even if the elastic ring-shaped member is mounted by light press-fitting, the receiving member can be firmly fixed by the cut-and-raised claw biting, and the elastic ring-shaped member can be easily incorporated and fixed so as not to come off easily. .

According to the dynamic pressure bearing of the ninth aspect, the elastic ring-shaped member has the cut-and-raised claws on both the inner peripheral side and the outer peripheral side, so that the external member is not attached when the receiving member is mounted. In response to the force from, the cut-and-raised claw cut and raised on the inner peripheral side and the cut and raised claw cut and raised on the outer peripheral side are deformed,
The elastic ring-shaped member can firmly fix the receiving member to the housing.

According to the dynamic pressure bearing of the tenth aspect, the cut-and-raised claw is formed in a direction parallel to the axial direction of the elastic ring-shaped member, so that the elastic ring-shaped member or the receiving member is aligned with the axial direction. Movement in parallel directions can be prevented.

According to the eleventh aspect of the present invention, since the elastic ring-shaped member has the cut-and-raised claw inclined with respect to the axial direction and the circumferential direction, the elastic ring-shaped member or the receiving member is formed in the circumferential direction. And movement in the axial direction can be prevented.

According to the twelfth aspect of the present invention, since the receiving member has the flange for restraining the cushioning member in the axial direction, it is possible to prevent the cushioning member from moving in the axial direction.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a dynamic pressure bearing according to a first embodiment of the present invention.

FIG. 2 is a sectional perspective view of a modification of the first embodiment.

FIG. 3 is a sectional view of another modification.

FIG. 4A is a cross-sectional view taken along line AA of FIG. 4B, showing a dynamic pressure bearing according to a second embodiment of the present invention, and FIG.
FIG. 3 is a vertical sectional view taken along line BB of FIG.

FIG. 5 is a partial cross-sectional view of a modification of the second embodiment.

FIG. 6A is a longitudinal sectional view of a dynamic pressure bearing according to a third embodiment of the present invention, and FIG. 6B is a perspective view of the cushioning member.

7A is a longitudinal sectional view showing a modification of the cushioning member of FIG. 6, and FIG. 7B is a perspective view of the cushioning member.

FIG. 8 is a perspective view showing a modification of the cushioning member of FIG.

[Description of References] 11, 31, 42, 52, 62, 72 ... receiving member, 12, 22, 32 ... dynamic pressure generating groove, 13 ... cylindrical portion, 23, 33 ... inner cylindrical portion, 24, 35 ... outer cylinder Reference numeral 34: middle cylinder portion 31b: flange 41: corrugated plate, elastic ring-shaped member 61, 71, 81: elastic ring-shaped member 61a, 71a, 71b, 81a: cut-and-raised portion.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Oda 3-5-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka F-term in Koyo Seiko Co., Ltd. 3J011 AA03 BA02 CA01 CA02 SC01 3J012 AB03 BB01 CB03 CB10 DB07 DB20

Claims (12)

[Claims] 1. A dynamic pressure bearing having a synthetic resin receiving member having a dynamic pressure groove formed therein, wherein the receiving member is supported by a buffer member that does not substantially strain the receiving member. And dynamic pressure bearing. 2. The dynamic pressure bearing according to claim 1, wherein the cushioning member has a cylindrical portion integrally formed on an outer peripheral portion of the receiving member, and one end of the cylindrical portion and the receiving member. A dynamic pressure bearing, wherein a cylindrical space is formed between the cylindrical portion and the receiving member. 3. The dynamic pressure bearing according to claim 1, wherein the cushioning member has an inner cylindrical portion formed integrally with an outer peripheral portion of the receiving member, and the inner cylindrical portion. While one end of the receiving member is connected to one end of the receiving member, while the other end of the inner cylindrical portion is connected to the other end of the outer cylindrical portion,
A dynamic pressure bearing, wherein a cylindrical space is formed between the inner cylinder and the receiving member and between the inner cylinder and the outer cylinder. 4. The dynamic pressure bearing according to claim 1, wherein the buffer member is formed separately from an outer peripheral portion of the receiving member, and an inner cylindrical portion fitted to the receiving member and an outer cylindrical portion. And one end of the inner cylinder and one end of the outer cylinder are connected to form a cylindrical space between the inner cylinder and the outer cylinder. A dynamic pressure bearing characterized by the above. 5. The dynamic pressure bearing according to claim 1, wherein the buffer member is formed separately from an outer peripheral portion of the receiving member, and an inner cylindrical portion externally fitted to the receiving member, and a middle cylindrical portion. And, having an outer cylinder portion, while one end of the inner cylinder portion and one end of the middle cylinder portion are connected, the other end of the middle cylinder portion and the other end of the outer cylinder portion And an end connected to form a cylindrical space between the inner cylinder and the middle cylinder and between the outer cylinder and the middle cylinder. bearing. 6. The dynamic pressure bearing according to claim 1, wherein the buffer member is a wavy elastic ring-shaped member provided on an outer peripheral portion of the receiving member. 7. The dynamic pressure bearing according to claim 6, wherein the wavy elastic ring-shaped member has a convex portion forming a waveform as viewed from the outside in the radial direction inclined in one circumferential direction. Dynamic pressure bearing. 8. The dynamic pressure bearing according to claim 1, wherein the buffer member is an elastic ring-shaped member having cut-and-raised claws. 9. The dynamic pressure bearing according to claim 8, wherein the elastic ring-shaped member has the cut-and-raised claws on both an inner peripheral side and an outer peripheral side. . 10. The dynamic pressure bearing according to claim 8, wherein the cut-and-raised claw is formed in a direction parallel to an axial direction of the elastic ring-shaped member. 11. The dynamic pressure bearing according to claim 8, wherein the cut-and-raised claw is inclined with respect to an axial direction and a circumferential direction of the elastic ring-shaped member. . 12. The dynamic pressure bearing according to claim 1, wherein said receiving member has a flange for restraining said buffer member in an axial direction. bearing.