JP2004052990A - Spherical dynamic pressure bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spherical dynamic pressure bearing having high versatility for a use and a strong bearing. <P>SOLUTION: This spherical dynamic pressure bearing 10 is connected to an external shaft 52 for the use. The bearing 10 is provided with a ball 11, bearings 12 and 13 formed with spherical spaces to rotatably store the ball 11 and oil grooves 12a and 13a on an inner wall surface to section the spherical spaces, a supporting shaft 14 fixed to the ball 11 on an end side to be rotatable integrally with the ball 11 and having a projecting part 16 to project to the outside of the bearings 12 and 13 on the other end side, and a recessed part 18 formed into a recessed shape in a direction away from the ball 11 and provided at a distal end part of the projecting part 16 inserted and fixed with the external shaft 52. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spherical dynamic pressure bearing, and more particularly to a spherical dynamic pressure bearing that can be used with high versatility.
[0002]
[Prior art]
In a spindle motor for an HDD or the like, a fluid dynamic pressure bearing is used because it is necessary to increase rotational runout accuracy. As a fluid dynamic pressure bearing, for example, one described in Japanese Patent Application Laid-Open No. 2001-165154 is known.
[0003]
FIG. 14 shows a conventional spherical dynamic pressure bearing 100. The spherical dynamic pressure bearing 100 has a spherical ball 101, a pair of bearing members 102 and 103 formed with a spherical space for rotatably storing the ball 101, and one end inserted into the ball 101 and fixed to the ball 101. And a support shaft 104. Oil grooves are formed on the inner wall surfaces of the bearing members 102 and 103 that define the spherical space.
[0004]
The lower bearing member 102 and the upper bearing member 103 are arranged with an O-ring 105 interposed therebetween, and are bonded between the bearing members 102 and 103 to fix the bearing members 102 and 103 together. A gap 106 for inserting the agent is formed. The bearing member 102 is pressed against the bearing member 103, and an adhesive is injected into the gap 106 with a minute gap 108 formed between the inner wall surface of the bearing member 102 and the bearing member 103 and the ball 101. The member 103 is fixed, and a necessary and sufficient minute gap 108 is secured between the ball 101 and the bearing member 102 and the inner wall surface of the bearing member 103.
[0005]
[Problems to be solved by the invention]
When assembling the spherical dynamic pressure bearing 100, first, the support shaft 104 is inserted and fixed to the ball 101, and the one integrated with the ball 101 and the support shaft 104 is incorporated into the bearing members 102 and 103. The reason for this is that if the ball 101 is first incorporated into the bearing members 102 and 103, and then the support shaft 104 is inserted into the ball 101 and is to be fixed with an adhesive, the adhesive leaks out to the outer peripheral surface of the ball 101, This is because it becomes an obstacle in the minute gap 108. If the support shaft 104 is to be fitted to the ball 101 without using an adhesive, the strength is not preferable because the bearing members 102 and 103 are made of engineered plastic material.
[0006]
As described above, since the one integrated with the ball 101 and the support shaft 104 is assembled into the bearing members 102 and 103, a user such as a motor manufacturer using the spherical dynamic pressure bearing 100 can support the ball. The shaft 104 itself is used as an external shaft (for example, a rotating shaft of a motor). For this reason, since the support shaft 104 of the spherical dynamic pressure bearing 100 cannot be separated from the external shaft prepared by the user, there is a problem that the versatility of use of the spherical dynamic pressure bearing 100 is limited.
[0007]
In this case, it is conceivable to attach a coupling to the support shaft 104 and attach a rotating shaft of the motor to the coupling, but the overall length of the supporting shaft 104, the coupling, the rotating shaft of the motor, and the like is too long. However, there is a problem that it is difficult to use the spherical dynamic pressure bearing 100.
[0008]
Further, since the bearing members 102 and 103 are made of engineered plastic material, the adhesive between the adhesive and the bearing members 102 and 103 is not good, and the bearing members 102 and 103 cannot be firmly held. There was a problem.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a spherical dynamic pressure bearing which solves the above-mentioned problems of the prior art, has high versatility in use, and has a strong bearing.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a spherical dynamic pressure bearing of the present invention is a spherical dynamic pressure bearing used by being connected to an external shaft, wherein a ball and a spherical space for rotatably storing the ball are formed. A bearing having an oil groove formed on an inner wall surface that defines the spherical space; and a protruding portion fixed to the ball at one end so as to be rotatable integrally with the ball, and projecting to the outside of the bearing at the other end. And a concave portion provided at the tip of the protruding portion formed in a concave shape in a direction away from the ball and into which the external shaft is inserted and fixed.
[0011]
As a result, since the concave portion is provided at the tip of the protruding portion, when the external shaft is coupled to the support shaft, even if the external shaft has various dimensions, the distal end of the external shaft is machined into the concave portion. The coupling can be easily performed, and the versatility of the use of the spherical dynamic pressure bearing can be increased.
[0012]
Here, the outer shaft is adhesively fixed to the recess. Since the concave portion is formed in a concave shape in a direction away from the ball, it is possible to make it difficult for the adhesive to flow into the peripheral surface of the ball when the external shaft is connected to the support shaft with the adhesive.
[0013]
The spherical dynamic pressure bearing according to the present invention is a spherical dynamic pressure bearing used by being connected to an external shaft, wherein a ball and a spherical space for rotatably storing the ball are formed, and an inner space defining the spherical space is formed. A sleeve having an oil groove formed in a wall surface, and a sleeve having a protruding portion fixed to the ball so as to be rotatable integrally with the ball and protruding to the outside of the bearing, wherein the external shaft is inserted and fixed. And a supporting shaft.
[0014]
With this, a sleeve-shaped support shaft is provided, which is fixed to the ball so as to be rotatable integrally with the ball, protrudes to the outside of the bearing, and has a sleeve-shaped support shaft into which the external shaft is inserted and fixed. Can be inserted into and fixed to the sleeve-shaped support shaft, and the versatility of the use of the spherical dynamic pressure bearing can be enhanced. Further, when the external shaft is inserted into the sleeve-shaped support shaft and fixed with an adhesive or the like, it is possible to make it difficult for the adhesive to flow into the peripheral surface of the ball.
[0015]
Here, the support shaft is fixed to the ball through the ball, and has the protrusions at both ends.
[0016]
Further, a recess formed in a concave shape in a direction away from the ball from an outer peripheral surface of the protrusion is provided at a tip of the protrusion.
[0017]
The spherical dynamic pressure bearing of the present invention is a spherical dynamic pressure bearing used by being connected to an external shaft, wherein a ball and a spherical space for rotatably storing the ball are formed, and an inner space defining the spherical space is formed. A bearing having an oil groove formed in a wall surface, a support shaft fixed to the ball so as to be rotatable integrally with the ball, and connectable to the external shaft, and a bottom portion and a side facing the bottom portion have an opening. And a first housing made of a metal material that accommodates the bearing in close contact with the bearing, between the outer peripheral surface of the bearing and the inner peripheral surface of the first housing near the opening. An adhesive space in which an adhesive can be injected in a state where the bearing is pressed toward the bottom is formed.
[0018]
As a result, when a pair of bearings made of an engineered plastic material are bonded to each other with an adhesive as in the related art, the adhesion between the plastic material and the adhesive is not good, so that the pair of bearings must be firmly connected. However, since the first housing made of a metal material is provided, the bearing can be firmly held via the inner peripheral surface of the first housing having good adhesiveness.
[0019]
In addition, a second housing made of a metal material that covers the opening is provided, and an outer peripheral surface of the first housing and an inner peripheral surface of the second housing are joined with an adhesive. .
[0020]
Also, an adhesive injection hole capable of injecting an adhesive into the bonding space is formed in a portion of the second housing corresponding to the bonding space.
[0021]
Further, an oil injection hole is formed in the bottom of the first housing, and the oil injected from the oil injection hole is stored in a portion of the bearing facing the bottom so as to be supplied to the oil groove. An oil reservoir is provided.
[0022]
Further, the oil reservoir is characterized by comprising a plurality of injection grooves formed radially with respect to the oil injection hole.
[0023]
Further, the oil injection hole is closed by a closing member after supplying the oil to the oil reservoir.
[0024]
Further, the bonding space is formed in a wedge-shaped cross section which is wider at an opening end face of the opening. Thus, even without the second housing, for example, the bearing can be pressed toward the bottom of the first housing by the adhesive firmly fixed to the first housing in a wedge-shaped cross section.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
First, an embodiment of the present invention will be described with reference to FIGS. In FIG. 1, a spherical dynamic pressure bearing 10 includes a spherical ball 11 made of a steel material, a pair of engineered plastic material bearing members 12 and 13 having a spherical space for rotatably storing the ball 11, and a ball 11. And a support shaft 14 having one end inserted therein and to which the ball 11 is fixed. The support shaft 14 has a protruding portion 16 protruding outside the bearing member 13 on the other end side. On the inner wall surfaces of the bearing members 12 and 13 that define the spherical space, a large number of fine V-shaped oil grooves 12a and 13a are formed. The lower bearing member 12 and the upper bearing member 13 are arranged with an O-ring 15 interposed therebetween.
[0026]
The projection 16 of the support shaft 14 is provided with a recess 18 into which an external shaft 52 such as a motor rotation shaft is inserted. The concave portion 18 has a concave opening in a direction away from the ball 11.
[0027]
Since the concave portion 18 is provided at the distal end of the protruding portion 16, when the external shaft 52 is coupled to the support shaft 14, the distal end portion of the external shaft 52 is machined even if the external shaft 52 has various dimensions. In addition, it is possible to easily couple to the concave portion 18, and the versatility of the use of the spherical dynamic pressure bearing can be enhanced. When the external shaft 52 is bonded and fixed to the concave portion 18, since the concave portion 18 is formed in a concave shape in a direction away from the ball 11, the external shaft 52 is connected to the concave portion 18 of the support shaft 14 with an adhesive. In this case, it is possible to make it difficult for the adhesive to flow into the peripheral surface of the ball 11. The method of connecting the external shaft 52 to the concave portion 18 of the support shaft 14 is not limited to the method using an adhesive as described above. For example, a key groove is formed on both the inside of the protrusion 16 and the external shaft 52. The key may be inserted into both key grooves to fix them, or the external shaft 52 may be fitted into the recess 18 and fixed.
[0028]
A first housing 21 that houses the bearing members 12 and 13 in close contact with each other is disposed outside the bearing members 12 and 13, and the first housing 21 includes a bottom 22 and a bottom 22 that are located on opposite sides of the protrusion 18. An opening 23 is provided on the opposite side of the opening 22. A second housing 24 is provided so as to cover the opening 23 of the first housing 21. The second housing 24 is formed with a hole 25 from which the protruding portion 16 protrudes, and the side wall portion 26 of the second housing 24 is located on the outer peripheral surface of the first housing 21.
[0029]
An adhesive space 28 into which an adhesive can be injected is formed between the outer peripheral surface of the bearing member 13 near the opening 23 of the first housing 21 and the inner peripheral surface of the side wall 26 of the first housing 24. In the vicinity of the peripheral edge of the second housing 24, for example, four holes 29 for injecting an adhesive into the bonding space 28 are formed at intervals of 90 degrees. In the bonding space 28, the bearing member 13 is pressed against the bearing member 12, and the O-ring 15 is crushed to some extent, so that a necessary and sufficient minute gap 19 is formed between the surface of the ball 11 and the inner wall surfaces of the bearing members 12 and 13. Then, an adhesive is injected from the holes 29 and solidified. The adhesive is strongly adhered to the first housing 21 made of a metal material, and the adhesive is strongly adhered to the inner peripheral surface of the first housing 21 and solidified in the adhesion space 28, and the adhesive is provided. The solidified adhesive is not strong enough to be bonded to the first housing 21 made of a metal material, but is also bonded to the outer peripheral surface of the bearing member 13. Further, the bonding space 28 is formed in a wedge-shaped cross section so as to have a wider shape at the opening end face of the opening 23, which is clearly shown in FIG.
[0030]
Further, an adhesive space 30 is formed between the inner peripheral surface of the end of the side wall 26 of the second housing 24 and the outer peripheral surface of the first housing 21. Since the first housing 21 and the second housing 24 are both made of a metal material, they have good adhesiveness to an adhesive, and are firmly fixed by the adhesive injected into the adhesive space 30.
[0031]
FIGS. 2A, 2B, and 2C show the second housing 24, the bearing members 12, 13, and the first housing 21, respectively. It is accommodated by one housing 21. On the inner wall surfaces of the bearing members 12 and 13 which define a spherical space for rotatably storing the ball 11 with the O-ring 15 interposed therebetween, a large number of fine V-shaped oil grooves 12a and 13a are formed. I have.
[0032]
FIG. 3A shows a support shaft 14 having a protrusion 16 on one end side. FIG. 3B shows the ball 11. A hole is formed in the center of the ball 11, and a portion of the support shaft 14 on the side opposite to the protrusion 16 is fitted into the hole. The support shaft 14 is inserted into the hole 11 of the bearing member 13 shown in FIG.
[0033]
4 and 5 show an example in which two spherical dynamic pressure bearings are used as a pair.
FIG. 4A shows a state in which the support shaft 14 on which the protruding portion 16 is formed is fitted into the ball 11, and FIG. 4B shows a state in which the support shaft 34 which is paired with the support shaft 34 shown in FIG. 11 shows an example of fitting. The support shaft 34 shown in FIG. 4B does not have the protrusion 16 as in the support shaft 14 shown in FIG. 4A and is formed in a cylindrical shape. One end 34a opposite to the side to be fitted is inserted into the concave portion 18 of the projecting portion 18, an adhesive is injected into the concave portion 18, and the one end 34a and the concave portion 18 are bonded and fixed. In this case, when the support shaft 34 is inserted into the concave portion 18 from above, the concave portion 18 is opened in a direction away from the ball 11, so that the adhesive does not flow out to the ball 11 into which the support shaft 14 is fitted. Can be.
[0034]
FIG. 5A shows a state in which the support shaft 36 on which the protruding portion 36 is formed is fitted into the ball 11, and FIG. 5B shows a state in which the support shaft 42, which is a pair with the one shown in FIG. 11 shows an example of fitting. The support shaft 42 shown in FIG. 5B is not provided with the protrusion 16 as in the support shaft 14 shown in FIG. 4A, and is provided on the opposite side of the support shaft 42 from the side fitted to the ball 11. One end 42a is inserted into the concave portion 40 of the projecting portion 38, an adhesive is injected into the concave portion 40, and the one end 34a and the concave portion 18 are bonded and fixed. The concave portion 40 has a shape diverging outward. In this case, when the support shaft 42 is inserted into the concave portion 40 from above, the concave portion 40 opens in a direction away from the ball 11 and the concave portion 40 has a shape diverging outwardly, so that the adhesive is 36 can be prevented from flowing out to the ball 11 in which the ball 36 is inserted.
[0035]
FIG. 6 shows an example in which a ring-shaped flange 26 a is extended from the side wall 26 of the second housing 24. The flange portion 26a allows the spherical dynamic pressure bearing 10 to be easily attached to an external device.
[0036]
FIG. 7 shows a portion of the spherical dynamic pressure bearing 10 shown in FIG. 6 from which the ball 11 and the support shaft 14 are removed, and shows a first housing 21 and a second housing 24 surrounding the bearing members 12 and 13.
[0037]
FIG. 8 shows another embodiment of the present invention. In FIG. 8, the spherical dynamic pressure bearing 10 has a sleeve-shaped support shaft 50. The support shaft 50 penetrates the ball 11 vertically and is fitted and fixed to the ball 11 so as to be rotatable integrally with the ball 11. The support shaft 50 has a protruding portion 50 a protruding outside the bearing 12 at the upper end and the lower end thereof. An adhesive is applied to the inner peripheral surface of the support shaft 50, and an external shaft 52 such as a motor shaft is inserted into the support shaft 50 and then fixed to the support shaft 50 by the adhesive.
[0038]
In addition, using one external shaft 52, the spherical dynamic pressure bearing shown in FIG. 8 and the spherical dynamic pressure bearing shown in FIG. 6, for example, are paired, and one end of the external shaft 52 is inserted into the concave portion 18 and fixed. It is also possible to insert the other part of the shaft 52 into the sleeve-like support shaft 50 and fix it.
[0039]
Since the sleeve-shaped support shaft 50 has the protruding portion 50a, even when the adhesive leaks out of the support shaft 50 when the external shaft 52 is fixed to the support shaft 50 with an adhesive, the outer peripheral surface of the protruding portion 50a is formed. And the adhesive can be prevented from flowing into the outer peripheral surface of the ball 11.
[0040]
FIG. 9 shows an example in which a plate portion 54 is provided on the outer peripheral portion of the protruding portion 50a of the support shaft 50 shown in FIG. The dish portion 54 has a recess formed in a direction away from the ball 11. When an adhesive is applied to the inner peripheral surface of the support shaft 50 and the outer shaft 52 is inserted into the support shaft 50 and fixed to the support shaft 50 by the adhesive, the adhesive leaking out of the support shaft 50 is removed from the plate portion. , It is possible to reliably prevent the adhesive from flowing into the outer peripheral surface of the ball 11.
[0041]
FIG. 10 shows an example in which the second housing 24 is omitted from the spherical dynamic pressure bearing 10 shown in FIG. 1 or FIG. The bonding space 28 is formed in a wedge-shaped cross section so as to have a wider shape at the opening end face of the opening 23. The bonding space 28 shown in FIG. 10 is formed larger than the bonding space shown in FIG. 1 or FIG.
[0042]
Since the first housing 21 is formed of a metal material, the first housing 21 has good adhesiveness with an adhesive, and the adhesive in the bonding space 28 is solidified integrally with the inner peripheral surface of the first housing 21. As a result, the bearing member 13 can be held in a state of being pressed against the bearing member 12 by the solidified wedge-shaped adhesive.
[0043]
Next, another embodiment of the present invention will be described with reference to FIGS.
An oil injection hole 66 is formed at the bottom of the first housing 21. An oil reservoir 62 is provided at a portion of the bearing member 12 facing the bottom of the first housing 21. The oil injected from the oil injection hole 66 is stored in the oil storage part 62 and supplied to the oil grooves 12a and 13a. The oil storage section 62 includes a plurality of injection grooves 63 formed radially with respect to the oil injection hole 66. The injection groove 63 communicates with the oil grooves 12a and 13a. As shown in FIG. 12, the oil injection hole 66 is closed by bonding the metal ball closing member 68 after supplying the oil to the oil storage portion 62. Note that the oil injection hole 66 may close the closing member 68 only by press-fitting after supplying the oil to the oil storage section 62.
[0044]
Conventionally, the oil for the oil grooves 12a and 13a has been supplied from a hole (for example, the hole 25 shown in FIG. 1) formed in the upper part of the bearing member 13. For this reason, it is not possible to secure a sufficient escape space for the air in the minute gap between the inner wall surfaces of the bearing members 12 and 13 and the ball 11, and the oil uniformly spreads over the entire oil grooves 12a and 13a. There was a problem that was insufficient. The hole 25 from which the projection 16 of the bearing member 13 projects
On the other hand, according to the present embodiment, since the oil reservoir 62 having the injection groove 63 communicating with the oil grooves 12a and 13a is provided, for example, the oil is press-fitted from the oil injection hole 66. Accordingly, it is possible to supply the oil sufficiently while allowing the air in the minute gap between the inner wall surfaces of the bearing members 12 and 13 and the ball 11 to escape to the outside. Further, it is also possible to allow air in a minute gap between the inner wall surfaces of the bearing members 12 and 13 and the ball 11 to escape from the hole 25.
[0045]
When the oil storage portion 62 is provided in the one having the sleeve-shaped support shaft 50 as shown in FIG. 8 or 9, the oil injection hole 66 is provided at a position other than the center so as to keep the support shaft 50 away. Just do it.
[0046]
【The invention's effect】
As described above, according to the configuration of the present invention, it is possible to provide a spherical dynamic pressure bearing having high versatility in use and having a strong bearing.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a spherical dynamic pressure bearing according to the present invention.
FIG. 2 is a cross-sectional view showing a second housing (a), a bearing member (b), and a first housing (c) of FIG.
FIGS. 3A and 3B are a partial cross-sectional view showing a support shaft having a protruding portion on one end side and a view showing a ball;
FIGS. 4A and 4B are diagrams showing a state in which a support shaft formed with a protrusion is fitted into a ball, and a diagram showing an example in which a pair of support shafts is fitted into a ball as shown in FIGS. b).
5 (a) and 5 (a) show a state in which a support shaft having a protrusion formed thereon is fitted into a ball, and a diagram showing an example in which a pair of support shafts is fitted into a ball (FIG. 5 (a)). b).
FIG. 6 is a sectional view showing a modification of the spherical dynamic pressure bearing shown in FIG. 1;
FIG. 7 is a view showing a portion of the spherical dynamic pressure bearing shown in FIG. 6 excluding a ball and a support shaft, and showing a first housing and a second housing surrounding a bearing member.
FIG. 8 is a sectional view showing another embodiment of the spherical dynamic pressure bearing of the present invention.
FIG. 9 is a view showing a modification of the spherical dynamic pressure bearing shown in FIG. 8;
FIG. 10 is a cross-sectional view showing another embodiment of the spherical dynamic pressure bearing of the present invention.
FIG. 11 is a sectional view showing another embodiment of the spherical dynamic pressure bearing of the present invention.
FIG. 12 is a diagram showing a state in which the oil injection hole is closed with a metal ball closing member after oil is supplied.
FIG. 13 is a perspective view showing an oil reservoir formed in the bearing member.
FIG. 14 is a view showing a conventional spherical dynamic pressure bearing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Spherical dynamic pressure bearing 11 Ball 12, 13 Bearing member 12a, 13a Oil groove 14 Support shaft 15 O-ring 16 Projection 18 Depression 21 First housing 22 Bottom 23 Opening 24 Second housing 28 Bonding space 29 Holes 34, 42, Reference Signs List 50 Support shaft 52 External shaft 62 Oil reservoir 63 Injection groove 66 Oil injection hole 68 Blocking member

Claims (12)

A spherical dynamic pressure bearing used by being connected to an external shaft,
With the ball,
A bearing in which a spherical space for rotatably storing the ball is formed, and an oil groove is formed on an inner wall surface defining the spherical space;
A support shaft fixed at one end to the ball so as to be rotatable integrally with the ball and having a projecting portion projecting to the outside of the bearing at the other end;
A recess provided at the tip of the protruding portion, which is formed in a concave shape in a direction away from the ball and in which the external shaft is inserted and fixed,
A spherical dynamic pressure bearing comprising: The spherical dynamic pressure bearing according to claim 1, wherein the external shaft is adhesively fixed to the concave portion. A spherical dynamic pressure bearing used by being connected to an external shaft,
With the ball,
A bearing in which a spherical space for rotatably storing the ball is formed, and an oil groove is formed on an inner wall surface defining the spherical space;
A sleeve-shaped support shaft fixed to the ball so as to be rotatable integrally with the ball, having a protruding portion protruding outside the bearing, and having the external shaft inserted and fixed therein. Spherical dynamic pressure bearing. The spherical dynamic pressure bearing according to claim 3, wherein the support shaft penetrates the ball and is fixed to the ball, and has the protrusion at both ends. The spherical dynamic pressure bearing according to claim 3, wherein a concave portion formed in a concave shape in a direction away from the ball from an outer peripheral surface of the projecting portion is provided at a tip of the projecting portion. A spherical dynamic pressure bearing used by being connected to an external shaft,
With the ball,
A bearing in which a spherical space for rotatably storing the ball is formed, and an oil groove is formed on an inner wall surface defining the spherical space;
A support shaft fixed to the ball so as to be integrally rotatable with the ball and connectable to the external shaft;
A first housing made of a metal material that has a bottom and a side facing the bottom and has an opening and is in close contact with the bearing and houses the bearing;
With
An adhesive space is formed between an outer peripheral surface of the bearing near the opening and an inner peripheral surface of the first housing, in which an adhesive can be injected while the bearing is pressed toward the bottom. A spherical dynamic pressure bearing. A second housing made of a metal material covering the opening,
The spherical dynamic pressure bearing according to claim 6, wherein an outer peripheral surface of the first housing and an inner peripheral surface of the second housing are connected with an adhesive. The spherical dynamic pressure bearing according to claim 6, wherein an adhesive injection hole capable of injecting an adhesive into the bonding space is formed in a portion of the second housing corresponding to the bonding space. An oil injection hole is formed in the bottom portion of the first housing,
7. The spherical shape according to claim 6, wherein an oil storage portion for storing the oil injected from the oil injection hole so as to be able to be supplied to the oil groove is provided at a portion facing the bottom portion of the bearing. Dynamic pressure bearing. The spherical dynamic pressure bearing according to claim 9, wherein the oil storage portion includes a plurality of injection grooves formed radially with respect to the oil injection hole. The spherical dynamic pressure bearing according to claim 9, wherein the oil injection hole is closed by a closing member after supplying oil to the oil reservoir. The spherical dynamic pressure bearing according to claim 6, wherein the bonding space is formed in a wedge-shaped cross section that is wider at an opening end face of the opening.

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