JPH07310741A - Spherical bearing and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a spherical bearing and a manufacture method therefor, ensuring smooth rotating motion or oscillating motion, freedom from the occurrence of a problem such as a gall and giving high durability. CONSTITUTION:This bearing is a spherical bearing having an inner member 1 with slide projected spherical surface 5, an outer member 2 for rotating and/or holding the inner member 1 in such state as capable of oscillation, and a thin-walled metal bush 3 fused to the outer member 2 with slide recessed spherical surface 8 formed slidably relative to the slide projected spherical surface 5 of the inner member 1. In this case, the inner member 1 with the projected spherical surface 5 covered approximately tightly with a bush material is used as a core, and the outer member 2 is die cast. In this case, the outer member 2 and the bush material are fused to each other, and the bush material is tightened through the shrinkage of the member 2 at the time of cooling a molded product, thereby forming the thin-walled metal bush 3 having recessed spherical surface corresponding to the projected spherical surface of the inner member 1. Also, an external force is made to act between the inner member 1 and the outer member 2, thereby forming a micro gap between the projected spherical surface of the inner member 1 and the recessed spherical surface of the thin-walled metal bush 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical bearing and a method of manufacturing the same, and in particular, a smooth rotary motion and a swing motion can be obtained. For example, a link motion mechanism of a transmission or a steering section of an automobile or other various automatic devices. The present invention relates to a spherical bearing that is preferably used for the above and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a spherical bearing of this type, for example, in JP-A-64-12118, a liner composed of a resin liner body and a metal mesh member embedded in the liner body is used. This liner is put on the outer periphery of the inner ring in a close contact manner, then molten die casting metal is cast on the outer periphery of the liner, the outer ring is die cast and at the same time the inner peripheral surface of the outer ring is partially cut into the mesh member of the liner. Then, after cooling, an external force is applied between the inner ring and the liner to form a minute gap, the inner ring and the outer ring are firmly fixed to the outer ring side, and the inner ring side has a minute gap. A spherical bearing and a method for manufacturing the same have been proposed which provide smooth rotational movement and oscillating movement.

However, in a spherical bearing using such a resin liner in which a metal mesh member is embedded, since a resin liner is used as the liner,
When die-casting the outer ring by casting molten die-cast metal on the outer periphery of this liner, the resin liner body is melted by the high-temperature molten metal of the die-cast metal, and this molten resin flows to the inner ring side, and therefore the liner The metal mesh member was exposed between the inner and outer rings, which may cause galling.

By the way, when the outer ring is cast by casting the molten die-cast metal on the outer periphery of the liner, the molten metal of the cast die-cast metal is prevented from flowing out to the inner ring side by the molten metal cutting portion of the die casting mold. It is necessary to surely remove the water. However, such a resin liner lacks its rigidity, and it is difficult to press the melt-cutting portion of the die-casting die firmly against the end of the liner, and the liner end and the melt-cutting portion contact each other. Gaps may occur. Also,
The resin liner body melts at the end where the resin liner comes into contact with the hot water draining part of the die casting mold, and from this point as well, there may be a gap between the liner end and the hot water draining part. is there. Then, when such a gap is formed in the contact portion between the liner end portion and the molten metal draining portion, the molten metal flows out from this gap to the inner ring side, and like the resin outflow to the inner ring side,
It may cause galling.

In addition, since the liner body of the above-mentioned resin liner is made of resin, its operating temperature is at most 1
In addition to the problem that the resin is limited to about 80 ° C and that this resin deteriorates at high temperatures, a complicated operation of burying a metal mesh member inside the resin liner body is required during the manufacturing process, There is also a problem that the manufacturing cost becomes higher.

As another spherical bearing, for example, as described in Japanese Patent Publication No. 53-12655, first, a bearing metal layer having a relatively low melting temperature is formed on the surface of a spherical body by die casting, Further, a ball receiving part having a relatively high melting temperature is formed on this bearing metal layer by die casting, and at this time, a part of the teaching part of the bearing metal layer and the ball receiving part is integrated, and after cooling, There has been proposed a method of manufacturing a spherical bearing in which an external force is applied between the spherical body and the bearing metal layer to form a minute gap, thereby giving a smooth rotational movement or oscillating movement.

However, in this method, when the bearing metal layer is die-cast on the surface of the spherical body, burrs are apt to be generated at the end of the formed bearing metal layer. As a result, the contact between the end of the bearing metal layer and the melt removal part of the die-casting die becomes incomplete, and as a result, there is no melt removal during die casting of the ball receiving part on the bearing metal layer. When it became completely, the molten metal flowed out onto the surface of the spherical body, which caused galling and the like.

Further, in the method of die-casting the bearing metal layer on the surface of the spherical body and then die-casting the ball receiving portion on the bearing metal layer in this way, when the ball receiving portion is die cast, When the molten metal of the die-casting metal forming the sphere receiving portion comes into contact with the bearing metal layer die-casted to, the difference in melting temperature between the two metals is small or substantially nonexistent, so that the bearing metal layer is partially remelted, This re-melted die-cast metal of the bearing metal layer is partially mixed with the molten metal of the sphere receiving part, and the original metal characteristics of the bearing metal layer are lost, which easily causes seizure during use. If the dissimilar metals are mixed in such a part, the strength of the metal structure in that part is lowered, and there is a problem that the initial durability cannot be maintained.

[0009]

Therefore, the inventor of the present invention
As a result of intensive studies to solve various problems in the conventional spherical bearing and the manufacturing method thereof, as a result, an internal member having a sliding convex spherical surface and an external member that holds the internal member so as to be rotatable and / or swingable. Between the outer member and the thin member metal bush, which is fused to the outer member during die casting of the outer member and has a sliding concave spherical surface slidable with respect to the sliding convex spherical surface of the inner member. As a result, they have found that the conventional problems described above can be solved, and completed the present invention.

Therefore, it is an object of the present invention to achieve a smooth rotary motion and a swing motion, and to prevent a problem such as galling during use, and to provide a spherical bearing having excellent durability. It is to provide the manufacturing method.

[Means for Solving the Problems]

That is, according to the present invention, an inner member having a sliding convex spherical surface, and an outer member formed by die casting to hold the inner member in a rotatable and / or swingable manner,
A spherical bearing having a thin-walled metal bush that is fused to the external member during die casting of the external member and that has a sliding concave spherical surface that is slidable with respect to the sliding convex spherical surface of the internal member. Is.

Further, according to the present invention, the sliding convex spherical surface of the internal member is covered with a thin-walled bushing element body in a substantially close contact manner, and the internal member and the bushing element body covering the sliding convex spherical surface are die-cast mold. Installed inside, injecting molten metal of die casting metal into the die casting mold and casting molten die casting metal around the bush element body, die casting the external member and between the external member and the bush element body. Fused,
Next, the bush element body and the external member that cover the internal member and its sliding convex spherical surface are taken out from the die-casting mold and cooled, and the bush element body is tightened by the contraction of the external member during this cooling, and the sliding convex spherical surface of the internal member. Forming a thin metal bush having a sliding concave spherical surface corresponding to, between the sliding convex spherical surface of the internal member and the sliding concave spherical surface of the thin metal bush by applying an external force between the internal member and the external member. It is a method of manufacturing a spherical bearing in which a minute gap is formed.

In the present invention, the inner member having a sliding convex spherical surface may be a spherical body or an inner ring having an outer surface having a convex spherical surface. Those used in this type of spherical bearing can be used, and examples thereof include bearing steel (high carbon bearing steel).

The outer member for holding the inner member is manufactured by die casting and holds the sliding convex spherical surface of the inner member in a rotatable and / or swingable manner.
Examples of the material thereof include aluminum-based metals such as aluminum and its alloys, and die-cast metals such as zinc and zinc-based metals of its alloys. The melting temperature of the die-cast metal is preferably 570 to 750 ° C. in the case of aluminum-based metal, and
In the case of zinc-based metal, the temperature is preferably 420 to 450 ° C.

The thin metal bush interposed between the inner member and the outer member is fused to the outer member during die casting of the outer member, and the sliding protrusion of the inner member is formed. A sliding concave spherical surface that is slidable with respect to the spherical surface is formed. The thickness of the thin metal bush is preferably 0.3 to 0.8 mm, more preferably 0.4 to 0.8 mm.
It is 0.6 mm. If the thickness is less than 3 mm, there will be a manufacturing problem in that the removal of the molten metal will be incomplete during die casting of the external member, and if it is greater than 0.8 mm, the bush element will be formed using a press die or the like. It becomes difficult to make close contact with the sliding convex spherical surface of the internal member.

The bush metal for forming the thin metal bush needs to be fused to the external member during die casting of the external member. For example, brass [YBsC1 to YBsC4, melting point (solid phase): 915
° C], lead brass [melting point (solid phase): 885 ° C], free-cutting brass [C3560R, melting point (solid phase): 885 ° C], brass for forging [melting point (solid phase): 880 ° C], aluminum Brass [melting point (solid phase): 935 ° C], phosphor bronze [PBC2 to PBC
3, melting point (solid phase): 880 to 950 ° C.], aluminum bronze [AlBC1 to AlBC2, melting point (solid phase): 1037
-1062 ° C] and the like, and preferably a copper-based metal having a melting temperature of 800 to 900 ° C. Further, in order to surely and more firmly achieve fusion with the die-cast metal, it is more preferable that the difference from the melting temperature of the die-cast metal is within a range of 100 to 400 ° C.

Further, the thin metal bush preferably has a groove formed along the circumferential direction of the inner surface of the central portion of the thin metal bush at the time of manufacturing the bearing, and used as an oil groove at the time of use. For example, when the sliding convex spherical surface of the internal member is covered with the thin-walled bush element body in a substantially close contact manner, the groove is formed by attaching a thin metallic cylinder to the sliding convex spherical surface. Both ends of the body are caulked so as to be in close contact with the sliding convex spherical surface, and at the time of this caulking operation, they are formed along the circumferential direction of the inner surface of the central portion of the bush element body.

In manufacturing the spherical bearing of the present invention,
First, the sliding convex spherical surface of the internal member has a wall thickness of 0.3 to 0.8 m.
m, preferably 0.4 to 0.6 mm, and covered with a thin-walled bush element body in a substantially adherent manner. At this time, preferably, the bush body is first formed into a cylindrical shape, cut into a predetermined length, and attached to the sliding convex spherical surface of the internal member,
Then, using a pair of press dies having a notch portion in the tip abutting portion that abuts with the half mold surface corresponding to one half of the sliding convex spherical surface of the internal member, pressing from both end sides of the bush element body, Both ends of the bush element are crimped along the sliding convex spherical surface of the internal member, and in the circumferential direction of the inner surface of the central portion of the bush element, the grooves formed by the notch portions of the tip abutting portions abutting each other are formed. A groove is formed along the circumferential direction on the inner surface side of the central portion.

Next, the internal member and a bushing element body that covers the sliding convex spherical surface are installed in a die casting die, and a molten metal of die casting metal is injected into the die casting die to surround the bushing element body. The outer member is cast by casting molten die cast metal. During die casting of this external member,
In the die-casting die, the high-temperature molten metal of the die-casting metal collides with the bushing element body that covers the sliding convex spherical surface of the internal member, fuses to the surface of this bushing element body, and when cooled, die-casted externally. The member firmly adheres to the surface of the bush body.

After die casting the outer member in this manner, the bush member and the outer member covering the inner member and its sliding convex spherical surface are taken out from the die casting mold and cooled by natural cooling or by forced cooling if necessary. When cooled in this way, the bushing element body is tightened by contraction of the external member during cooling, whereby a thin metal bush having a sliding concave spherical surface corresponding to the sliding convex spherical surface of the internal member is formed.

Further, after taking out from the die casting mold and cooling, an external force is applied between the inner member and the outer member,
A minute gap is formed between the sliding convex spherical surface of the internal member and the sliding concave spherical surface of the thin metal bush, and a spherical bearing capable of smooth rotational movement and swinging movement is manufactured between them.

[0022]

According to the present invention, between the outer member and the thin-walled metal bush, the molten metal of the die-cast metal collides with the surface of the thin-walled metal bush during die casting of the outer member, and at that time, the heat of the molten metal causes the molten metal to collide. A part of the surface of the thin-walled metal bush is melted, whereby the outer member to be die cast and the thin-walled metal bush are fused, and the thin-walled metal bush is, so to speak, fixed to the outer member in a seized state, and hence The thin metal bush is firmly fixed to the external member without impairing the metal characteristics of the thin metal bush itself.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the accompanying drawings.

Example 1 FIGS. 1 to 3 show a spherical bearing according to Example 1 of the present invention. This spherical bearing is formed by forming a through hole 4 for shaft attachment in a spherical body made of high carbon bearing steel, and an inner ring (internal member) 1 having a sliding convex spherical surface 5 on an outer surface, and an aluminum alloy ( It is formed by die casting of JIS ADC 12) and has an inner ring receiving portion 6 that holds the inner ring 1 rotatably and / or swingably on one end side, and a connecting portion 7 for connecting to an external device on the multi-end side. It is composed of a holder (external member) 2 and a thin metal bush 3 made of free-cutting brass and interposed between the inner ring 1 and the holder 2.

The thin metal bush 3 is fused to the inner surface of the inner ring receiving portion 6 and fixed to the inner ring receiving portion 6 during die casting of the holder 2. The bush 3 is formed with a sliding concave spherical surface 8 that is slidable with respect to the sliding convex spherical surface 5 of the inner ring 1, and is formed along the circumferential direction of the inner surface of the central portion of the bush 3 when the bearing is manufactured. A groove 9 which is sometimes used as an oil groove is formed.

The spherical bearing of Example 1 is manufactured as follows. That is, first, as shown in FIG. 4, the inner ring 1 is manufactured by forming a through hole 4 for shaft attachment in a spherical body made of high carbon bearing steel. The inner ring 1 is ground after quenching, and the sliding convex spherical surface 5 is lapped.

Next, as shown in FIG. 5, a melting temperature of 885
℃ free-cutting brass (bush metal) whose inner diameter is the inner ring 1
A metal thin-walled cylindrical body 10 having a thickness (t) of 0.5 mm which substantially corresponds to the outer diameter of is formed.

Next, as shown in FIG. 6, the thin metal cylinders 10 are attached to the inner ring 1 so that the axial centers of the inner rings 1 and the metallic thin cylinders 10 coincide with each other. Then, this is set between the pair of press dies 11a and 11b. Here, the pair of press dies 11a, 1
A crimping portion 12 and a tip notch portion 13 are formed on each of the 1b, and a centering of the inner ring 1 is fitted in the through hole 4 of the inner ring 1 at the center of one press die 11a. A male piston 14a having a centering portion 15a for performing and a tip pressing portion 16a for pressing one end portion of the thin metal cylinder 10 at the time of tightening the pair of press dies 11a, 11b is slidably arranged, and the other At the center of the press die 11b, the other end of the metal thin-walled cylindrical body 10 is fastened to the fitting portion 15b to which the tip of the centering portion 15a of the male piston 14a is fitted and the pair of press dies 11a and 11b. A female piston 14b having a tip pressing portion 16b for pressing is slidably arranged.

After setting the inner ring 1 and the thin metal cylinder 10 between the pair of press dies 11a and 11b,
As shown in FIGS. 7 and 8, these press dies 11a, 1
1b is tightened, then the male piston 14a and the female piston 14b are operated, and both ends of the metal thin-walled cylindrical body 10 are pressed by the tip pressing portions 16a and 16b of the male piston 14a and the female piston 14b. At the same time, both ends of the thin metal cylinder 10 are caulked and closely contact with the sliding convex spherical surface 5 of the inner ring 1, and at the same time, at the center thereof, the groove 9 is formed along the circumferential direction of the inner surface of the center by the tip notch 13. A thin-walled bush element body 1 that is formed and covers the sliding convex spherical surface 5 of the inner ring 1 in a substantially intimate contact with the thin-walled metal cylindrical body 10.
Mold to 7.

In this way, the sliding convex spherical surface 5 of the inner ring 1 is covered with the thin-walled bushing element body 17 in a substantially adherent state, and then, as shown in FIG.
As shown in, the inner ring 1 and the bush element body 17 are installed in the die casting molds 18a, 18b, 18c as cores,
A molten metal of die casting metal made of an aluminum alloy (JIS ADC 12) having a melting temperature of 580 ° C. is injected into the cavity 19 formed by these die casting dies 18a, 18b, 18c, and the molten die casting metal is injected around the bush body 17. The casting is performed, and the holder 2 (not shown) is die cast.

In die casting of the holder 2, as shown in a partially enlarged view of FIG. 10, since the bush element body 17 has a thickness (t) of 0.5 mm, die casting dies 18a, 18b, When installed in 18c, the end of this bush element body 17 is die-casting die 18a, 1
The molten metal of the die-cast metal injected into the cavity 19 is made into contact with the bush body 17 in addition to reliably contacting the molten metal cutting portion 20 of 8b to surely remove the molten metal during die casting.
Is cooled on the surface of the bush body 17, and is then molded into the holder 2 and fused to the surface of the bush body 17.

Further, the holder 2 is die-cast in this way, and the die-casting dies 18a, 18b, 18c are formed.
When the molded product composed of the bush element body 17 and the holder 2 covering the sliding convex spherical surface 5 of the inner ring 1 is taken out and cooled, the holder 2 contracts and the bush element body 17 is tightened, and the sliding projection of the inner ring 1 is made. A thin metal bush 3 having a sliding concave spherical surface 8 corresponding to the spherical surface 5 is formed. For this reason, the sphericity of the sliding convex spherical surface 5 of the inner ring 1 is well reflected in the sliding concave spherical surface 8 of the thin metal bush 3.

Next, die casting dies 18a, 18b, 1
After taking out the molded product from 8c, an external force is applied between the inner ring 1 and the holder 2 to form a minute gap between the sliding convex spherical surface 5 of the inner ring 1 and the sliding concave spherical surface 8 of the thin metal bush 3. As a result, a spherical bearing is formed between the inner ring receiving portion 6 of the holder 2 and the inner ring 1 between the sliding convex spherical surface 5 and the sliding concave spherical surface 8 by a minute gap so that the spherical bearing can be rotated and / or rocked. It

In the first embodiment, between the inner ring receiving portion 6 of the holder 2 and the thin-walled metal bush 3 in the manufactured spherical bearing, the thin-walled metal bush 3 is heated by the heat of the molten metal during die casting of the holder 2. Part of the surface was melted, and the inner ring receiving portion 6 and the thin-walled metal bush 3 were fused together as if they were seized, and both were firmly fixed.

Embodiment 2 FIGS. 11 and 12 show a ball joint according to Embodiment 2 of the present invention. This ball joint has a sliding convex spherical surface 5 unlike the spherical bearing of Embodiment 1 described above. A ball-equipped rod (internal member) 21 having a spherical body portion 22 and a connecting portion 23, and a spherical body receiving portion 25 and a connecting portion 26 formed by die casting of an aluminum alloy (JIS ADC 12) having a melting temperature of 580 ° C. Holder (external member) 24
And a thin metal bush 27 that is fused and fixed to the inner surface of the spherical body receiving portion 25 during die casting of the dust holder 24.

In the ball joint of the second embodiment, the thin metal cylinder (not shown) for forming the thin metal bush 27 is made of free-cutting brass (bush metal) having a melting temperature of 885 ° C. and has a thickness (t). This thin metal cylinder having a thickness of 0.5 mm is attached to the sliding convex spherical surface 5 of the spherical portion 22 of the spherical rod 21 by using a pair of press dies having no tip notch. It is manufactured in the same manner as in Example 1 except that both ends are crimped.

In the ball joint of the second embodiment, the upper part of the spherical body receiving portion 25 of the holder 2 and the rod 21 with a spherical body.
The seal member 28 is attached between the lower part of the connecting portion 23 and the lower portion of the connecting portion 23 to form the lubricant pocket 29, and the lid member 30 is attached to the lower portion of the spherical body receiving portion 25 of the holder 2 to form the oil sump portion 31. Has been done.

Also in the second embodiment, as in the first embodiment, the thin metal bush 27 is firmly fixed to the inner surface of the spherical body receiving portion 25 during die casting of the holder 24, and this thin wall bush 27 is also fixed. The sliding concave spherical surface 8 of the metal bush 27 well reflects the sphericity of the sliding convex spherical surface 5 of the spherical body portion 22 of the spherical rod 21, and a minute gap is formed between them.

[0039]

EFFECTS OF THE INVENTION According to the present invention, a spherical bearing which can achieve smooth rotational movement and oscillating movement, has no problems such as galling during use, and is excellent in durability. The manufacturing method can be provided.

[Brief description of drawings]

FIG. 1 is a front view showing a spherical bearing according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is a sectional view taken along line bb of FIG.

FIG. 4 is a sectional view of the inner ring shown in FIG. 1.

5 is a perspective view of a thin-walled metal cylinder for forming the thin-walled metal bush shown in FIG. 1. FIG.

FIG. 6 is a cross-sectional explanatory view showing a state in which a thin metal cylinder is attached to the inner ring and set in a pair of press dies.

FIG. 7 is a cross-sectional explanatory view showing a state in which a pair of press dies are fastened to each other and a bush element body is covered over the inner ring in a substantially intimate contact state.

FIG. 8 is an explanatory cross-sectional view showing a state in which the sliding convex spherical surface of the inner ring is covered with a bush element body in a substantially intimate contact state.

FIG. 9 is an explanatory cross-sectional view showing a state in which an inner ring whose sliding convex spherical surface is covered with a bush element is installed as a core in a die casting mold.

FIG. 10 is a partially enlarged cross-sectional explanatory view of FIG. 9.

FIG. 11 is a cross-sectional view showing a ball joint according to a second embodiment of the present invention.

FIG. 12 is a partially enlarged sectional view of FIG. 11.

[Explanation of symbols]

1 ... Inner ring, 2 ... Holder, 3 ... Thin metal bush, 4 ...
Through hole, 5 ... Sliding convex spherical surface, 6 ... Inner ring receiving portion, 7 ... Connecting portion,
8 ... Sliding concave spherical surface, 9 ... Groove, 10 ... Metal thin cylindrical body, 1
1a, 11b ... Press type, 12 ... Caulking part, 13 ... Tip notch part, 14a ... Male piston, 14b ... Female piston, 1
5a ... Centering part, 15b ... Fitting part, 16a, 16
b ... Tip pressing portion, 17 ... Bush element body, 18a, 18
b, 18c ... Die casting mold, 19 ... Cavity, 20
… Boiler removal part, 21… Rod with ball, 22… Sphere part, 23
... connecting part, 24 ... holder, 25 ... spherical receiving part, 26 ... connecting part, 27 ... thin metal bush, 28 ... sealing member, 2
9 ... Lubricant pocket, 30 ... Lid member, 31 ... Oil sump.

Claims (7)

[Claims] 1. An inner member having a sliding convex spherical surface, an outer member which is formed by die casting and holds the inner member so as to be rotatable and / or swingable, and an outer member which is used during die casting of the outer member. A spherical bearing, comprising: a thin metal bush fused to a member and having a sliding concave spherical surface slidable with respect to the sliding convex spherical surface of the internal member. 2. The spherical bearing according to claim 1, wherein the thin-walled metal bush has a groove that is formed along the circumferential direction of the inner surface of the central portion of the bearing during manufacturing, and is used as an oil groove during use. 3. The die-cast metal forming the external member is an aluminum-based metal having a melting temperature of 570 to 750 ° C., and the bush metal forming the thin metal bush is a copper-based metal having a melting temperature of 800 to 900 ° C. Claim 1
The spherical bearing described. 4. The die-cast metal forming the external member is a zinc-based metal having a melting temperature in the range of 420 to 450 ° C., and the bush metal forming the thin metal bush has a melting temperature of 80.
The spherical bearing according to claim 1, which is a copper-based metal in the range of 0 to 900 ° C. 5. The spherical bearing according to claim 1, wherein a melting temperature difference between the die-cast metal and the bush metal is within a range of 100 to 400 ° C. 6. A sliding convex spherical surface of an internal member is covered with a thin-walled bushing element body in a substantially close contact manner, and this internal member and a bushing element body covering the sliding convex spherical surface are installed in a die casting mold. , Injecting molten metal of die casting metal into the die casting mold and casting molten die casting metal around the bush element body, die casting an external member and fusing between the external member and the bush element body. Then, the bush element body and the external member that cover the internal member and its sliding convex spherical surface are taken out from the die casting mold and cooled, and the bush element body is tightened by contraction of the external member during this cooling, and the sliding convex portion of the internal member. A thin metal bush having a sliding concave spherical surface corresponding to a spherical surface is formed, and an external force is applied between the internal member and the external member to form a sliding convex spherical surface of the internal member and a sliding concave ball of the thin metal bush. A method of manufacturing a spherical bearing, characterized in that a minute gap is formed between the surface and the surface. 7. When a sliding convex spherical surface of an internal member is covered with a thin-walled bushing element body in a substantially adherent manner, a thin metallic cylindrical body is adhered to the sliding convex spherical surface of the internal member. A thin-walled bush element body is formed by caulking both ends of the cylindrical body so as to cover the sliding convex spherical surface substantially in close contact with each other, and a groove is formed along the circumferential direction of the inner surface side of the central portion of the bush element body. Item 5. A method of manufacturing a spherical bearing according to item 5.