JP3148731B2 - Slide bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide bearing used for supporting a shaft such as a spool of an electromagnetic control valve.

[0002]

2. Description of the Related Art FIG. 10 is a sectional view showing a conventional electromagnetic control valve having a slide bearing, and FIG. 11 is an enlarged sectional view of a slide bearing mounting portion in FIG. In FIG. 1, reference numeral 1 denotes a sleeve of an electromagnetic control valve. The sleeve 1 has a supply port 2 connected to a hydraulic oil supply system, output ports 3 and 4, and drain ports 5 and 6. Reference numeral 7 denotes a spool that slides in the sleeve 1, and reference numeral 8 denotes a shaft coaxially connected to one end of the spool 7, and the shaft 8 is made of a non-magnetic material. The left and right slide bearings 9 and 10 support the shaft 8 slidably in the axial direction. The left and right cores 11 and 12 fit and hold the slide bearings 9 and 10, respectively. Is formed in a cylindrical shape having a through hole 11a in which the left slide bearing 9 is fitted and held, and the right core 12 has a fitting hole 12a in which the right slide bearing 10 is fitted and held. The left and right cores 11 and 12 are made of a magnetic material.

Reference numeral 13 denotes a plunger made of a magnetic material which is integrally fitted on the outer periphery of the intermediate portion of the shaft 8 and is located between the left and right slide bearings 9 and 10.
A solenoid 15 is disposed over the outer peripheral surface of the solenoid 12, a cover member 15 covers the outer peripheral area of the solenoid 14, and 16a is a rubber cushioning material provided on the left end of the plunger 13.
6b is a rubber cushioning material provided at the inner bottom of the fitting hole 12a of the right core 12, 17 is a spring for urging the spool 7 in one direction, and the spool 7 is energized by the solenoid 14. Operate against the spring 17.

Here, the left and right slide bearings 9 and 10 are used.
In FIG. 11, which shows the slide bearing 9 on the left side of FIG.
An outer ring 19 made of a magnetic material (metal) fitted to 1a, a retainer 19 made of a non-magnetic material fitted inside the outer ring 18 and a rolling element 20 held by the retainer 19 and axially rolling in a predetermined range. A plurality of balls that can rotate are supported by the balls 20 so that the shaft 8 can slide in the axial direction. Therefore, the conventional slide bearings 9 and 10 have a configuration in which the outer race 18, the retainer 19, and the ball 20 are integrally unitized.

Next, the operation will be described. As shown in FIG. 10, when the solenoid 14 is energized with the spool 7 shutting off the output ports 3 and 4, the spool 7 moves leftward in the figure against the spring 17 and its movement limit is reached. At this point, the cushioning material 16a at the left end of the plunger 13 comes into contact with the end face of the outer race 18 so that the cushioning material 16a
The impact sound between the plunger 13 and the outer ring 18 is absorbed at a. The spool 7 is biased by the spring 17 .
As a result, the right side of the shaft 8 contacts the end surface of the cushioning member 16b at the movement limit point, so that the impact sound with the shaft 8 is absorbed.

[0006]

Since the conventional slide bearing is constructed as described above, an outer ring 18 made of a magnetic material is required, and the outer ring 18 and the plunger 1 are required.
3 also requires a cushioning material 16a for absorbing the impact noise of the outer ring 3 or a member for providing a gap on the opposing surface between the outer ring 18 and the plunger 13, so that the number of parts increases and the cost increases. Also, there is a problem that the assembling of the retainer 18 and the retainer 19 is troublesome and the assembling workability is poor. In particular, after putting the ball into the retainer 19 from the radial outside,
It was necessary to attach the outer ring 18 so that the ball did not fall, and a special jig and method were required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can eliminate the need for the conventional outer ring and cushioning material, thereby reducing the number of parts and cost.
An object of the present invention is to provide a slide bearing that can reduce the frictional resistance between a retainer and a ball when the shaft moves in the axial direction, and that is easy to assemble, especially to attach the ball.

Another object of the present invention is to provide a slide bearing which can easily hold a ball to a retainer. Further, according to the present invention, the ball is temporarily held in the retainer before the retainer is assembled to the device,
It is an object of the present invention to obtain a slide bearing that can transfer and hold a ball to a predetermined position of a retainer after the retainer is assembled to a device. Another object of the present invention is to provide a slide bearing that can reliably hold a ball on a retainer.

[0009]

A slide bearing according to the present invention includes a cylindrical retainer and a ball held by the retainer, and a shaft inserted in the retainer is axially moved by the ball. In a slide bearing that supports the ball, a retainer formed of a resin having elasticity and having a cylindrical shape, and a plurality of retainers provided in the retainer and spaced apart in a circumferential direction, and the ball is fitted and elastically holds the ball. and the ball holding portion, in succession the ball holding portion provided in the axial direction of the retainer, the ball migrated from previous SL ball holding portion and a slit for rollably supporting the axial direction Things.

The ball holding portion of the slide bearing according to the present invention is adapted to elastically deform and hold the ball when the ball is press-fitted.

The ball holding portion of the slide bearing according to the present invention is expanded by a ball press-fitted into the ball holding portion, elastically deformed, and has a first projection for holding the ball with an elastic restoring force; An elastically deformable second projection that abuts the ball held by the projection and restricts the ball from moving into the slit; and further press-fits the ball held by the first projection. Is adapted to move over the second projection to the slit.

The ball holding portion of the slide bearing according to the present invention has a portion smaller in diameter than the ball and elastically deformable in the diameter increasing direction. A slide bearing according to the present invention includes: a cylindrical retainer;
And a ball held by the ball, the ball,
A slide bearing that supports a shaft inserted into a retainer
Wherein the retainer has a first holding position that can be held only by the retainer, and a retainer and the shaft.
And a second holding position for holding the ball .
By applying a fixed amount of force, from the first holding position
It is possible to move to the second holding position.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a sectional view showing an electromagnetic control valve provided with a slide bearing according to Embodiment 1 of the present invention, FIG. 2 is an enlarged sectional view of a slide bearing mounting portion in FIG. 1, and FIG. 3 (a) is FIGS. FIG. 3B is a cross-sectional view showing the retainer inside, FIG. 3B is a left end view of FIG.
FIG. 3C is a right end view of FIG. 3A, in which the same or corresponding parts as in FIGS. 10 and 11 are denoted by the same reference numerals, and redundant description is omitted. In the figure, reference numeral 21 denotes left and right slide bearings 9, which support both ends of a shaft 8 so as to be slidable in the axial direction.
The retainer 21 is a cylindrical member made of a resin such as nylon having elasticity, and has a flange 21a at one axial end.

Reference numeral 22 denotes a plurality of ball-fitting holes which are opened at the end face of the flange 21a and are spaced at equal intervals in the circumferential direction of the retainer 21. The cutout circular hole is formed to have a diameter into which the ball 20 can be inserted.

Reference numeral 23 denotes a plurality of slits provided on the retainer 21 and spaced at equal intervals in the circumferential direction of the retainer 21. These slits 23 are connected to the respective ball insertion holes 22 in series so as to form the ball. The retainer 21 extends from the fitting hole 22 to the entire length in the axial direction. Such slit 23
Is formed to have a slit width for supporting and guiding the ball 20 so as to roll freely in the axial direction of the retainer 21.

A ball holding portion 24 is provided at one end in the axial direction of the slit 23 and is located near the flange 21a of the retainer 21. The ball holding portion 24 is a ball press-fitted from the ball fitting hole 22. The first projections 25a and 25b provided on the wall surface of the slit 23 and projecting in a relative direction, and the wall surface of the slit 23 in the vicinity of the first projections 25a and 25b. And the second projections 26a and 26b protruding in the relative direction.

Here, the first projections 25a and 25b are set at an opposing interval (opposing width) narrower than the diameter of the ball 20, and the second projections 26a are smaller than the first projections 25a and 25b. , 26b have a longer protruding length from the slit 23. Therefore, the second protrusions 26a and 26b are
The facing distance is set to be narrower than the protrusions 25a and 25b. The first protrusions 25a and 25b and the second protrusions 26a and 26b are formed integrally with the retainer 21 so as to be elastically deformable in a direction in which the facing gap (facing width) is increased.

In FIG. 1, reference numeral 11b denotes a large-diameter step provided in a through hole 11a of the left core 11, and the large diameter step 11b is a retainer 21 of the slide bearing 9 fitted in the through hole 11a. Abut the flange 21a. Reference numeral 11c denotes a small-diameter step portion provided in the through hole 11a at the back of the retainer fitting portion.
1c abuts the tip of the retainer 21. Further, a gap narrower than the diameter of the ball 20 may be used. In FIGS. 1 and 2, reference numeral 12 b denotes a large-diameter step portion provided substantially in the middle of the fitting hole 12 a of the right core 12.
The large-diameter step portion 12b abuts the flange 21a of the retainer 21 of the slide bearing 10 fitted in the fitting hole 12a. Further, a gap narrower than the diameter of the ball 20 may be used. Reference numeral 12c denotes a small-diameter stepped portion provided at the back of the fitting hole 12a, and the small-diameter stepped portion 12c abuts the tip of the retainer 21 of the slide bearing 10. 3 and 4, reference numeral 27 denotes a retainer 2.
A concave groove formed in the inner peripheral surface of the inner peripheral surface of the inner peripheral surface of each of the ball insertion holes 22 and between the slits 23 and extending in the axial direction.

Next, as described above, the retainer 21 made of resin is used.
The assembly of the slide bearings 9 and 10 including the balls 20 will be described. FIG. 4 shows the assembling process of the ball 20 with respect to the retainer 21. FIG.
FIG. 2 is a cross-sectional view showing an initial state of press-fitting of the ball 20 into the ball 1.
4B is a left end view of FIG. 4A, FIG. 4C is a cross-sectional view showing the retainer 21 in a state where the ball 20 is temporarily held,
FIG. 4D is a left end view of FIG. 4C. First, the ball 20 is press-fitted between the first projections 25a and 25b of the ball holding portion 24 from the ball insertion hole 22 of the retainer 21 so that the first projections 25a and 25b
0 is temporarily held elastically. That is, when the ball 20 is pressed into the first protrusions 25a and 25b from the ball insertion hole 22 of the retainer 21 (see FIGS. 4A and 4B), the balls 20 push the first protrusions 25a and 25b. When the ball 20 is interposed between the first protrusions 25a and 25b, the ball 20 is expanded.
It is held by the elastic restoring force of 5a, 25b. The ball 20 that has intervened between the first protrusions 25a and 25b is
The protrusion length of the slit 23 from the wall surface is the first protrusion 25a, 2
Abuts on the second protrusions 26a, 26b longer than the second protrusions 5b (FIG. 4).
(C), (d)), the ball 20
Is securely held between the first protrusions 25a and 25b. Here, as long as desired, it is sufficient that the retainer 21 has a holding force enough to be transported while the ball 20 is held.

In this manner, the ball 20 is attached to the retainer 21.
Is attached, the ball 20 is held between the first protrusions 25a and 25b, and the movement of the ball 20 from the space between the first protrusions 25a and 25b to the slit 23 is changed to the second position.
The retainer 21 regulated by the projections 26a and 26b is used as a single product of the slide bearings 9 and 10. In use, the retainer 21 is composed of the left and right cores 11 in FIG.
12, and the assembling process is shown in FIG.

FIG. 5A shows that the ball 2 is
FIG. 5B is a cross-sectional view showing a state in which the retainer 21 holding 0 is assembled to the core 12, and FIG. 5B is a state in which the ball 20 in FIG. FIG. In other words, when assembling the retainer 21 to the core 12, first, as shown in FIG. 5A, the retainer 21 with the ball 20 held by the ball holding portion 24 as described above is Core 1
The fitting 21a is fitted into the fitting hole 12a, and the large diameter step 12b of the fitting hole 12a is fitted with the flange 21a of the retainer 21, and the small diameter step 12c of the fitting hole 12a is fitted with the tip of the retainer 21. Abut. In addition, the gap may be narrower than the diameter of the ball 20 (abutting is not all).

After attaching the retainer 21 to the core 12 in this manner, the first projections 25a, 25a
The ball 2 in the state shown in FIG.
0 is further pushed in the direction of the slit 23. This allows
By applying a force equal to or more than a predetermined amount to the ball 20 in a predetermined direction, the ball 20 pushes and expands the second protrusions 26a and 26b, and passes between the second protrusions 26a and 26b.
As shown in FIG. 2B, the ball 20 moves to a slit 23 where the ball 20 is rotatably held and guided between the retainer 21 and the shaft 8 in the axial direction.

The above is the case where the retainer 21 of the slide bearing 10 is mounted on the right core 12 in FIG. 1, but the slide bearing 9 is also mounted on the left core 11 in FIG.
Of the retainer 21 is assembled.

In this manner, the left and right cores 11 and
As shown in FIG. 1, both ends of the shaft 8 are slid in the axial direction by the balls 20 that have been transferred from the ball holding portions 24 of the respective retainers 21 to the slits 23 after the mounting. It is movably supported. Here, the ball 20 moving to the slit 23 is formed by the shaft 8 and the left and right cores 11 and 12.
Rolls along the slit 23 by the axial movement of the shaft 8 in contact with the inner wall surface of the core 11, 1.
Since the tip of the retainer 21 is in contact with each of the small-diameter step portions 11c and 12c, the ball 20 does not come off from the slit 23. In addition, the gap may be narrower than the diameter of the ball 20 (the ball does not come off even if it is not brought into contact).

Next, the operation will be described. Solenoid 1
The shaft 8 is moved in the axial direction by the excitation and the release of the excitation of the ball 4, and the ball 20 rolls in the axial direction along the slit 23 during the movement, so that the frictional resistance between the shaft 8 and the ball 20 is reduced. The shaft 8
Can be moved smoothly. Further, the plunger 13 collides with the flange 21a of the retainer 21 of one of the left and right slide bearings 9 and 10 due to the axial movement of the shaft 8, but the entire retainer 21 including the flange 21a is integrally formed of an elastic resin. This allows the flange 21a to absorb the collision sound between the plunger 13 and the flange 21a.

According to the first embodiment described above, the slide bearing 9,
10 can be configured, and the ball 2
0 is held elastically, the slide bearing 9,
10 can be transported, and can be used as slide bearings 9 and 10 separately.
1 can be dispensed with, and the elastic resin retainer 21 has a cushioning property for absorbing the impact sound of the plunger 13, so that the conventional cushioning members 16a and 16b can be specially used. This is not necessary, and therefore, the number of parts is reduced as compared with the conventional slide bearing, and there is an effect that the cost can be reduced.

Embodiment 2 FIG. In the first embodiment, the first protrusions 25a and 25b are provided on one end side in the axial direction of the slit 23, and the second protrusions 26a and 26b are provided near the first protrusions 25a and 25b. Is smaller than the interval between the second protrusions 26a and 26b, but the first protrusions 25a and 25b and the second
a and 26b are formed at the same interval width between the opposing portions and separated in the axial direction along the slit 23, and the ball 20 is disposed between the first protrusions 25a and 25b and the second protrusions 26a and 26b. May be held, and in this case, the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG. 6 is a front view of a slide bearing according to Embodiment 3 of the present invention, and FIG.
In the figure, reference numeral 28 denotes an arcuate surface portion formed on the wall surface of the slit 23 on the flange 21a side of the retainer 21 so as to be continuous with the ball-fitting hole 22. Is formed integrally with the retainer 21 as a portion having a small diameter and capable of being elastically deformed in the diameter increasing direction. 29 is a ball fitting hole 2 in the arcuate surface portion 28
The protrusion 29 is provided at the end opposite to the end 2, and this protrusion 29 is for bringing the ball 20 pressed into the arcuate surface portion 28 from the ball fitting hole 22 into contact.
That is, in the third embodiment, the arc surface portion 28
The ball holding portion 24 is constituted by one projection 29 with respect to one arc surface portion 28.

FIG. 8 is a sectional view showing an assembly process of the slide bearing according to the third embodiment. In the drawing, reference numeral 30 denotes a jig for assembling a bearing, and 31 denotes a plurality of pin holes provided in the jig 30. The number of the pin holes 31 is the same as that of the ball insertion holes 22 of the retainer 21. 32 is a push pin slidably inserted into the pin hole 31;
This push pin 32 is provided in the slit 23 of the retainer 21.
A slit having a diameter slightly larger than the slit width is used.

Next, a case where the ball 20 is assembled to the retainer 21 using the jig 30 and the retainer 21 is assembled to the core 11 will be described. First, the ball 20 is press-fitted and held from the ball fitting hole 22 of the retainer 21 to the arcuate surface portion 28 of the ball holding portion 24. After that press fit,
As shown in FIG. 8A, the push pin 32 of the jig 30 is fitted into the ball insertion hole 22 of the retainer 21, and the retainer 21 in this state is inserted into the core 11 as shown in FIG. 8B. After the fitting, when the push pin 32 is pushed in, the ball 20 of the arcuate surface portion 28 is pushed in by the push pin 32, and the ball 20 elastically deforms the projection 29 and gets over the projection 29, thereby holding the ball. The ball 20 of the portion 24 moves to the slit 23 and the retainer 21
Is set on the core 11. After the assembly setting, the jig 30 is removed as shown in FIG. Therefore, in the case of the slide bearing according to the third embodiment, the same effect as in the first embodiment can be obtained.

Embodiment 4 FIG. FIG. 9 is a side view showing a slide bearing according to Embodiment 4 of the present invention. In the figure, reference numerals 28a and 28b denote arc-shaped surface portions formed on the surface of the retainer 21 facing the slit 23.
8a and 28b are formed integrally with the retainer 21 as portions having a diameter smaller than the diameter of the ball 20 and capable of being elastically deformed in the diameter increasing direction. 22a is the ball fitting hole 22
The tapered surface 22a is formed so as to gradually increase in diameter from the arc surface portions 28a and 28b toward the ball fitting hole 22.
The opening diameter of the ball insertion hole 22 at the end face on the flange 21 a side is larger than the diameter of the ball 20. Reference numeral 29a denotes a projection provided on the small-diameter end side of the tapered surface 22a. The projection 29a prevents the ball 20 held by the arcuate surface portions 28a, 28b from coming out of the ball fitting hole 22. And is formed so as to be elastically deformable. That is, in the fourth embodiment, the ball holding portion 24 is formed by the arcuate surface portions 28a and 28b and the protrusion 29a.

Next, the assembly of the ball 20 to the retainer 21 will be described. When the ball 20 is inserted into the ball insertion hole 22 of the retainer 21 and pushed in, the ball 2
0, the projection 29a is elastically deformed, so that the ball 20 rides over the projection 29a and the arcuate surface portions 28a, 28a.
Move to b. In this case, when the ball 20 passes over the protrusion 29a, the protrusion 29a is elastically restored, so that the protrusion 29a comes into contact with the ball 20 transferred to the arcuate surface portions 28a, 28b, and the ball 20 is inserted into the ball. It is prevented from getting out of the hole 22. Therefore, the ball 20
Is reliably held by the arcuate surface portions 28a and 28b and the projection 29a. The retainer 21 to which the ball 20 is attached in this manner is attached and set to the cores 11 and 12 in the same manner as in the first embodiment, but after the attachment and setting, the retainers 21 are attached to the arc-shaped surface portions 28a and 28b. Ball 2
0 is further pushed in, the ball 20
The balls 20 are moved to the slits 23 by pushing and spreading the balls a and 28b, and the balls 20 are held along the slits 23 so as to freely roll in the axial direction as in the case of the first embodiment. Therefore, in the case of the fourth embodiment, the same effect as in the first embodiment can be obtained. In each of the above-described embodiments, an example in which the ball can roll in the axial direction at the time of the bearing has been described. Further, in each of the above embodiments, the slide bearing has been described. However, the slide bearing may be used as a bearing for receiving a rotating shaft.

[0033]

As described above, according to the present invention, a retainer is formed in a cylindrical shape with an elastic resin, is provided on the retainer, is separated in a circumferential direction, and is fitted with a ball. a plurality of ball holding portion for elastically held, provided in the axial direction of the retainer in succession to the ball holding portion, rollably supporting the balls that are migrating from a pre Symbol ball holding portion in the axial direction Since the slide bearing is provided with a slit that does not need to be formed, the slide bearing can be configured only by the resin retainer and the ball, and does not require the outer ring of the conventional slide bearing. Since the impact sound is absorbed by interfering with the collision of the plunger that moves integrally with the shaft of the control valve, the cushioning material or the plunger that moves integrally with the shaft as in the related art is used. It is not necessary to provide a component for providing the air gap and thus, there is an effect that cost can be reduced number of parts is reduced.

According to the present invention, since the ball is press-fitted into the ball holding portion of the retainer, the ball holding portion is elastically deformed and the ball is held by the elastic restoring force of the ball holding portion. This has the effect that the ball can be reliably held only by press-fitting the ball into the ball holding portion.

According to the present invention, the first protrusion that is pushed and expanded by the ball pressed into the ball holding portion and is elastically deformed to hold the ball with an elastic restoring force, and the ball held by the first protrusion is The ball holding portion includes an elastically deformable second protrusion that abuts on the ball to prevent the ball from moving to the slit, and the ball held by the first protrusion is further pressed into the ball so that the ball is pressed. Since it is configured so as to move over the second protrusion and to shift to the slit, the ball can be reliably held by the first protrusion and the second protrusion, thereby obtaining a single reliable slide bearing. There is an effect that can be.

According to the present invention, since the ball holding portion is formed of a portion having a diameter smaller than the diameter of the ball and capable of being elastically deformed in the radially increasing direction, an effect of obtaining a slide bearing having a simple structure can be obtained. is there. According to the invention, the cylinder
Shape retainer and the ball held by this retainer
The ball inserted into the retainer by the ball.
A slide bearing for supporting the shaft, wherein the retainer
Only a first holding position can be held by the retainer, before
Second retainer retained by the retainer and the shaft
And applying a predetermined amount of force to the ball.
From the first holding position to the second holding position.
Since the ball is configured to be movable , the ball can be held in the retainer in advance, and there is an effect that the workability of assembling the ball is simple and easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electromagnetic control valve provided with a slide bearing according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a slide bearing mounting portion of FIG.

3 (a) is a sectional view showing the retainer in FIGS. 1 and 2, FIG. 3 (b) is a left end view of FIG. 3 (a), and FIG.
FIG. 3C is a right end view of FIG.

4 (a) is a sectional view showing an initial state of press-fitting a ball into the retainer of FIG. 3, and FIG. 4 (b) is a sectional view of FIG.
4A is a left end view, FIG. 4C is a cross-sectional view showing the retainer in a state where the ball is temporarily held, and FIG. 4D is a left end view of FIG. 4C.

5A is a cross-sectional view showing a state in which a retainer in which a ball is held by a ball holding portion is attached to a core, and FIG. 5B is a view in which the ball in FIG. FIG. 9 is a cross-sectional view showing a state where the holding unit is shifted to a slit.

FIG. 6 is a front view of a slide bearing according to Embodiment 3 of the present invention.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a sectional view showing an assembly process of the slide bearing according to the third embodiment.

FIG. 9 is a side view showing a slide bearing according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view showing an electromagnetic control valve having a conventional slide bearing.

FIG. 11 is an enlarged sectional view of the slide bearing mounting portion of FIG.

[Explanation of symbols]

20 balls, 21 retainers, 23 slits, 2
4 ball holding portion, 25a, 25b first protrusion, 26
a, 26b Second protrusion.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 29/04 F16K 31/06 305

Claims (5)

(57) [Claims] 1. A slide bearing having a cylindrical retainer and a ball held by the retainer and supporting a shaft inserted in the retainer so as to be movable in the axial direction by the ball, a resin having elasticity. A plurality of ball retainers provided in the retainer, the plurality of ball retainers being provided in the retainer, being circumferentially separated, and being fitted with the balls to elastically retain the balls; slide bearings, characterized in that it comprises a slit provided in the axial direction, for supporting the ball migrated from previous SL ball holding portion rollably in the axial direction of the retainer by. 2. The slide bearing according to claim 1, wherein the ball holding portion is elastically deformed when the ball is press-fitted and holds the ball. 3. The ball holding portion is pushed and expanded by a ball press-fitted into the ball holding portion, elastically deformed, and has a first projection for holding the ball with an elastic restoring force, and a first projection for holding the ball. An elastically deformable second projection for contacting the ball and restricting the ball from moving to the slit S;
3. The slide bearing according to claim 1, wherein the ball held by the first protrusion is further press-fitted, so that the ball moves over the second protrusion and shifts to a slit. . 4. The ball holding portion comprises a portion having a smaller diameter or a smaller width than the diameter of the ball and capable of being elastically deformed in a direction of increasing the diameter or increasing the width. The slide bearing described. 5. A cylindrical retainer, and a ball held by the retainer, by the ball, the retainer
Slide bearing that supports the shaft
Thus, the retainer has a first holding position that can be held only by the retainer, and the retainer and the shaft.
A second holding position for holding the ball , and applying a predetermined amount of force to the ball to move the ball from the first holding position to the second holding position.
Slide bearing, wherein the kite is movable in a second holding position.