JP2003220456A - Manufacturing method for spherical bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a spherical bearing which does not generate deflective abrasion or burning of a ball receiving part and a ball during application of high load and allows light and smooth oscillation and rotation for a long time, and can completely eliminate shifting between the ball and the ball receiving part. <P>SOLUTION: The manufacturing method for the spherical bearing comprises a first step of mounting a resin liner to the ball by means of an injection molding with a ball for an inside member inserted as a core, a second step of inserting the ball mounted with the resin liner into a casting mold and die- casting the ball receiving part covering the resin liner, and a third step of forming a space between the ball and the ball receiving part by imparting an external force to the ball or the ball receiving part to allow the relative rotation between the ball and the ball receiving part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner member having a ball portion, which serves as a swing center of a link mechanism, and an outer member, which encloses the ball member, so as to swing or rotate freely. Suspension arm section and steering section,
The present invention relates to a method of manufacturing a spherical bearing used in a link motion mechanism such as a cutting blade drive unit of a combine.

[0002]

2. Description of the Related Art Generally, as a spherical bearing of this type,
A known one is provided with an inner member having a ball portion, and an outer member having a ball receiving portion for enclosing the ball portion of the inner member and connected to the inner member so as to be capable of swinging or rotating relatively. Has been. Even if a load is applied to the inner member, the ball receiving portion of the outer member must hold the ball portion irremovably against the applied load. Therefore, in a spherical bearing, the ball portion is enclosed in the ball receiving portion by using any structure,
In addition, it is a problem to ensure free swinging and rotating motion of the ball portion and the ball receiving portion.

As one of the structures of the ball receiving portion that has been conventionally adopted, a metal casing having a recess larger than the diameter of the ball portion is prepared, and the ball is wrapped with a resin sheet having self-lubricating property. It is known that the casing is pressed into this casing (Japanese Patent Laid-Open No. 57-7932).
No. 0, Japanese Utility Model Laid-Open No. 63-188230, JP-A-5
-26225, JP-A-7-190066, etc.). In this structure of the ball receiving portion, the resin sheet that wraps the ball portion is crushed between the ball portion and the casing to cause elastic deformation, so that the gap between the ball portion and the resin sheet is eliminated, It is possible to rotate the ball portion in the casing without rattling. Further, since the ball portion is in sliding contact only with the resin sheet, even if this spherical bearing is used for a long period of time, trouble such as uneven wear of the ball portion does not occur.

On the other hand, in the ball receiving portion of the type in which the resin sheet is sandwiched between the ball portion and the casing, since the resin sheet is in contact with the ball portion in a compressed state, the movement of the ball portion is caused. Is slightly heavier, and when a link mechanism is constructed using this spherical bearing, it is difficult to obtain a smooth and light movement. Further, since the resin sheet is pressed against the spherical surface of the ball portion, wear of the resin sheet is likely to occur over time, and if such wear progresses, rattling occurs between the ball receiving portion and the ball portion. There is also a problem that it tends to occur. Further, since a resin sheet is elastically deformed when a large load is applied, there is a problem that the ball portion is easily separated from the ball receiving portion when such a load acts on the spherical bearing.

On the other hand, as another structure of the ball receiving portion, there is known a structure in which the ball receiving portion is cast by using the ball portion as a core so that the ball receiving portion is enclosed in the ball receiving portion (Japanese Patent Publication No. -77886, etc.). In this structure, since the spherical surface of the ball portion is transferred to the ball receiving portion during casting, the gap between the cast metal ball receiving portion and the ball portion can be minimized without using a resin sheet. Therefore, it is possible to rotate the ball portion in the ball receiving portion without rattling by only slightly supplying oil between the ball portion and the ball receiving portion. In addition, since a minute gap is formed between the ball receiving portion and the ball portion and the gap is lubricated with an oil film, the movement of the ball portion is larger than that of the structure of the ball receiving portion in which the resin sheet is pressed. Becomes light and smooth. Further, since the metal ball receiving portion and the ball portion are brought into sliding contact with each other by oil film lubrication,
It has the characteristic that it does not rattle even after long-term use and has excellent durability.

[0006]

However, in this latter spherical bearing (Japanese Patent Publication No. 5-77886), since the minute gap between the metal ball receiving portion and the ball portion is lubricated with an oil film, it is high. Under special usage conditions such as load and high-speed rocking, there is a risk that the oil film will be broken and solid contact will occur between both parts at the parts where the contact surface pressure between the ball receiving part and the ball part is high. If you continue to use the product in the state where such a phenomenon occurs, it is expected that the ball part and the ball receiving part will be unevenly worn and the smooth movement will be impaired. It is expected that it will be impossible.

Further, in the spherical bearing in which the ball receiving portion is cast with the ball portion as the core, the spherical surface of the ball portion is surely transferred to the ball receiving portion, so that the gap between the two is minimized. However, in order to enable the movement of the ball part with respect to the ball receiving part, a very small gap (about 0.05 to 0.1 mm) is provided between the two, and there is rattling within the range of such gap. It was impossible to completely eliminate even.

The present invention has been made in view of the above problems, and an object thereof is to cause uneven wear and seizure in the ball receiving portion and the ball portion even when a high load is applied. It is an object of the present invention to provide a method of manufacturing a spherical bearing that is capable of performing light and smooth swinging and rotating motions over a long period of time.

Another object of the present invention is to completely eliminate rattling between the ball portion and the ball receiving portion, and to perform a light and smooth swinging and rotating movement for a long period of time. It is an object of the present invention to provide a method of manufacturing a spherical bearing capable of performing the above.

[0010]

To achieve the above object, a method of manufacturing a spherical bearing according to the present invention comprises an inner member having a ball portion and a ball receiving portion for enclosing the ball portion of the inner member. And a method of manufacturing a spherical bearing having an outer member connected to the inner member so that the inner member can swing or rotate relative to the inner member by injection molding with the ball portion of the inner member inserted as a core. A first step of mounting a resin liner on the ball portion, a second step of inserting the ball portion mounted with the resin liner into a casting mold, and die casting a ball receiving portion covering the resin liner,
An external force is applied to the ball portion or the ball receiving portion to form a gap between the ball portion and the ball receiving portion, and a relative rotation between the ball portion and the ball receiving portion is enabled; It is characterized by being composed of.

Here, the casting temperature is 400 ° C. or higher when a zinc alloy is used as the metal material forming the ball receiving portion, and the casting temperature is 600 ° C. or higher when an aluminum alloy is used. , These casting temperatures are far higher than the heat resistant temperature of resin, and when casting is performed with the resin liner as the core, inserted in the casting mold,
Usually, it is considered that the resin liner is carbonized. However, since the ball portion equipped with the resin liner has a certain amount of heat capacity, the resin liner in contact with the ball portion is cooled from the ball portion during casting of the ball receiving portion. Although the outside of the resin liner, that is, the side in contact with the molten cast alloy, is seized to the ball receiving portion, the resin sliding contact surface in contact with the ball portion may be seized to the ball portion. Even after the ball receiving portion is cast, a good contact state with the spherical surface of the ball portion can be maintained. Also, in die casting, the molten metal of the casting alloy is quickly injected into the mold at high pressure and immediately cooled, so the cycle time of product production is extremely short compared to high pressure casting, etc. It is possible to minimize the damage to the liner.

On the other hand, the resin liner is mounted on the ball portion before the ball receiving portion is cast, but in order to facilitate handling of the ball portion after mounting, the resin liner is closely attached to the ball portion. It is preferable to mold such a resin liner in a ring shape so that the resin liner can be fitted into Further, when the resin liner embedded in the ball receiving portion is rotated along with the ball portion and rotates in the ball receiving portion, the resin liner rubs against the ball receiving portion instead of the ball portion and wears. From this point of view, it is preferable to form a detent for the ball receiving portion on the outer peripheral surface of the ring-shaped resin liner.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A method of manufacturing a spherical bearing according to the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2
Shows a first embodiment of a spherical bearing manufactured by the method of the present invention. This spherical bearing is composed of a ball shank 1 as an inner member having a ball portion at its tip and a holder 2 as an outer member having a ball receiving portion 20 for enclosing the ball portion 10 of the ball shank 1. The ball shank 1 and the holder 2 are connected so as to swing or rotate freely.

The ball shank 1 is formed by welding a rod-shaped shank 11 to a steel ball having a high sphericity to form the ball portion 10. At the base of the shank 11, an attached object such as a link is attached. A hexagonal bearing surface 12 for fixing is formed. Further, a male screw 1 is attached to the tip of the shank 11.
3 is formed, and a nut can be screwed into this male screw 13 so that the mounted body can be clamped and fixed between the male screw 13 and the hexagonal bearing surface 12.

On the other hand, the holder 2 is made up of the ball shank 1
A ball receiving portion 20 for enclosing the ball portion 10 and a fixing portion 21 for connecting the ball receiving portion 20 to a link, and the ball receiving portion 20 and the fixing portion 21 are made of an aluminum alloy or a zinc alloy. It is integrally molded by die casting. The ball receiving portion 20 is a ball shank 1
The ball receiving portion 20 covers approximately 2/3 of the ball portion 10 so that the ball receiving portion 20 does not come off.
A concave spherical contact surface 22 that substantially matches the spherical surface of the ball portion 10 is formed inside the. As a result, the ball shank 1 can freely swing or rotate with respect to the holder 2 with the ball portion 10 as the swing center. An oil sump 23 is formed on the holder 2 at a position opposite to the shank 11, and the oil sump 23 is closed by a lid member 24. A female screw 25 is formed on the fixing portion 21 so that a male screw formed at the tip of a rod or the like that constitutes a link can be joined.

A boot seal 3 is attached between the outer peripheral edge of the holder 2 and the shank 11 of the ball shank 1, and the gap between the ball portion 10 of the ball shank 1 and the ball receiving portion 20 of the holder 2 is provided. On the other hand, in addition to preventing dust and dirt from entering, a seal pocket 30 for accommodating a lubricant such as grease is formed. Here, the end portion 31 of the boot seal 3 on the ball shank 1 side is in close contact with the shank 11 due to its elasticity, while the holder 2
The side end 32 is sandwiched between the outer peripheral edge of the holder 2 by a locking ring, and is prevented from coming off even when the ball shank 1 swings or rotates.

As described above, the ball receiving portion 20 of the holder 2 is formed by casting an aluminum alloy or a zinc alloy, and the sliding contact surface 22 contacting the ball portion 10 of the ball shank 1 is also formed of these alloys. There is. A minute gap (for example, 0.1 mm or less) is formed between the sliding contact surface 22 of the ball receiving portion 20 and the spherical surface of the ball portion 10. The minute gap is arranged on both sides of the ball receiving portion 20 with respect to this gap. The lubricant flows in from the sealed pocket 30 and the oil sump 23, and the spherical surface of the ball portion 10 and the sliding contact surface 2 of the ball receiving portion 20.
An oil film is formed between the two. As a result, in this spherical bearing, the ball portion 10 made of a steel ball and the ball receiving portion 20 also made of metal are brought into sliding contact with each other in the state of being lubricated with an oil film, so that the ball shank 1 can move lightly and smoothly with respect to the holder 2.

Here, the sliding contact surface 22 of the ball receiving portion 20 and the spherical surface of the ball portion 10 are substantially in contact with each other, but depending on the usage of the spherical bearing, a large load is applied to the local portion of the sliding contact surface 22. Works. For example, as shown in FIG. 3, a connecting rod that couples a pair of spherical bearings to both ends of the rod 4 and transmits the motion from the ball shank 1 of one spherical bearing to the ball shank 1 of the other spherical bearing. In the case of the above configuration, the load distribution around the ball portion 10 of the ball shank 1 is as shown in FIG. That is, in this usage mode, the holder 2 is pushed and pulled by the rod 4, and the movement is transmitted thereby, so that the holder 2 is pressed against the sliding contact surface 22 around the maximum diameter of the ball portion 10 that matches the longitudinal direction of the rod 4. Maximum load will be applied. In this way, when a large load is applied locally to the sliding contact surface 22 of the ball receiving portion 20, the contact surface pressure between the sliding contact surface 22 and the ball portion 10 increases, and the oil film between them breaks. There is a concern that If such a situation occurs, the sliding contact surface 2 made of metal is used.
Since the ball 2 and the ball portion come into direct contact with each other without an oil film, the sliding contact surface and the spherical surface of the ball portion are damaged,
In addition to impairing the smooth movement of the ball shank, in extreme cases, the ball receiving portion and the ball portion are seized, and the ball shank becomes immovable with respect to the holder.

Therefore, in this spherical bearing, a ring-shaped resin liner 5 slidingly contacting the ball portion 10 of the ball shank 1 is embedded in the ball receiving portion 20 of the holder 2, and the resin sliding contact surface of the resin liner 5 is slidably contacted with the metal. The sliding contact surface 22 of the ball receiving portion 20 is formed continuously without a gap with the surface. The resin liner 5 is made of, for example, a PEEK material, and is arranged locally in the sliding contact surface 22 where the oil film is likely to break. Therefore, in the spherical bearing used as in the usage example of FIG. 3, as shown in FIG. 1, the spherical bearing is arranged around the maximum diameter of the ball portion 10 that matches the longitudinal direction of the rod 4. still,
The embedding position of the resin liner 5 in the ball receiving portion 20 is not limited to this example, and may be arranged at an optimum position according to the distribution of the contact surface pressure between the ball portion 10 and the sliding contact surface 22.

The resin sliding contact surface formed on the inner peripheral surface side of the resin liner 5 forms one sliding contact surface 22 adjacent to the metal sliding contact surface without a gap, and is formed by injection molding as described later. It is attached to the ball. Therefore, the resin liner 5 is not in pressure contact with the ball portion 10, and the ball portion 1
Since 0 is not clamped by the resin liner 5, the ball shank 1 can move lightly and smoothly. In addition, a case where a large load is locally applied to the sliding contact surface 22 of the ball receiving portion 20 and the oil film between the ball portion 10 and the sliding contact surface 22 is broken occurs. However, as described above, the resin liner 5 is arranged at a place where the oil film is likely to be broken, and the sliding contact with the ball portion 10 is made not on the metal sliding contact surface but on the resin sliding contact surface. It is possible to prevent the spherical surface of 10 from being damaged, and it is possible to avoid the worst situation in which the ball portion 10 and the ball receiving portion 20 are burned.

Therefore, in view of the function of the resin liner 5 when such an oil film is broken, the material for molding the resin liner 5 is excellent in wear resistance and is in the case of solid contact with the ball portion 10. It is preferable that the material is self-lubricating so as not to hinder the movement of the ball shank 1.

Next, a specific method of manufacturing the spherical bearing of this embodiment will be described. The spherical bearing holder 2 of this embodiment is manufactured by die casting in which the ball portion 10 of the ball shank 1 is used as a core and is inserted into a casting mold. Therefore, when embedding the resin liner 5 in the ball receiving portion 20, it is necessary to first attach the resin liner 5 to the steel ball that will be the ball portion 10. 5 and 6 are a front view and a plan view showing a state in which a resin liner is attached to a steel ball. This resin liner 5 has a ball portion 1.
The ball portion 1 is formed into a ring shape having an inner diameter that matches the outer diameter of 0 and covers the maximum diameter of the ball portion 10.
It is attached to 0. In addition, a protrusion 50 that serves as a rotation stop is formed on the outer peripheral surface of the resin liner 5, and when the resin liner 5 is embedded in the ball receiving portion 20 of the holder 2 by die casting later, the resin liner 5 is prevented. The ball receiving portion 20 is prevented from rotating. The resin liner 5 has a thickness of about 0.5 mm,
It is formed thicker than the gap (0.1 mm or less) between the ball receiving portion 20 and the ball portion 10.

Such a resin liner 5 may be molded separately from the ball portion 10 and mounted on the ball portion 10 prior to die casting of the holder 2. However,
In consideration of the time and effort required to mount the resin liner 5 on the ball portion 10, it is preferable to manufacture the resin liner 5 by injection molding with the ball portion 10 inserted as a core. That is, a synthetic resin is injection-molded in a state where a steel ball to be the ball portion 10 is inserted into the mold, and the resin liner 5 is molded and mounted on the ball portion 10 in one step. If the resin liner 5 is molded in this way, the time and effort required for mounting the resin on the ball portion 10 are eliminated, and the inner peripheral surface of the resin liner 5 substantially matches the spherical surface of the ball portion 10, so that the resin liner 5 is While preventing the tightening of the part 10,
The resin liner 5 can be securely attached to the ball portion 10.

Next, the holder is die cast.
At the time of this die casting, as shown in FIG. 7, the ball portion 10 having the resin liner mounted in the previous step is inserted as a core into the pair of vertically divided casting dies 6 and 7, Then, a molten metal of aluminum alloy or zinc alloy is pressed into the cavity 8 in the mold. At this time, the inserted ball portion 10 is sandwiched by the support seats 60 and 70 formed on the molds 6 and 7, and the positional displacement in the molds is prevented. Further, the resin liner 5 has a ball portion 1.
It is located inside the cavity 8 in a state of being mounted at 0, leaving an inner peripheral surface in contact with the ball portion 10, and is covered with the alloy injected into the cavity 8.

As a result, as shown in FIG. 8, the holder 2 in which the ball portion 10 is wrapped with the alloy is cast, and the ball portion is held only at the portions corresponding to the support seats 60 and 70 of the molds 6 and 7. It is exposed from the second ball receiving portion 20. Also,
The resin liner 5 mounted on the ball portion 10 is embedded in the cast ball receiving portion 20 and is firmly fixed to the ball receiving portion 20. Since the casting temperature when the zinc alloy is used as the material of the holder 2 is 400 ° C. or higher, and the casting temperature when the aluminum alloy is used is 600 ° C. or higher, the casting temperature is the heat resistance of the resin liner 5. The temperature is far higher than the temperature, and it is considered that the resin liner 5 which is originally extremely thin and has a thickness of 0.5 mm is carbonized when the holder 2 is cast. However, in the manufacturing process using such die casting, the ball portion 10 has an extremely large heat capacity as compared with the resin liner 5, so the ball portion 10 flows into the resin liner 5 from the molten alloy of the casting alloy. It plays a role of removing heat energy and prevents the carbonization of the resin liner 5. Therefore, in the resin liner 5, the outer peripheral surface side in contact with the ball receiving portion 20 is burned to the ball receiving portion 20, but the inner peripheral surface side in contact with the ball portion 10 remains without being carbonized and becomes To form a resin sliding contact surface. In die casting, molten metal of the casting alloy is quickly injected into the cavity 8 under high pressure, and the time from the molten metal injection to the removal of the holder 2 is as short as 5 to 10 seconds.
Therefore, also in this respect, it is considered that carbonization of the resin liner 5 during the casting of the holder 2 is prevented.

Next, the shank 11 is welded to the ball portion 10 enclosed by the ball receiving portion 20 of the holder 2. Projection welding is used for such welding, and as shown in FIG. 9, the end surface of the shank 11 is pressed against the spherical surface of the ball portion 10 exposed from the ball receiving portion 20 of the holder 2 with a predetermined force F, and An electrode is brought into contact with each of 2 and the shank 11, and a predetermined welding current is applied between these electrodes. Since the ball receiving portion 20 of the holder 2 is in close contact with the ball portion 10 when it is cast in the previous process, even if a welding current is indirectly applied to the ball portion 10 via the holder 2 as described above. , Ball receiver 20
The conduction resistance at the boundary between the ball portion 10 and the ball portion 10 is extremely small, and the shank 11 can be joined to the ball portion 10 without welding the ball receiving portion 20 and the ball portion 10. Further, since the resin liner 5 covers only a part of the spherical surface of the ball portion 10, it does not hinder the passage of the welding current from the ball receiving portion 20 to the ball portion 10. Then, when the projection welding is completed in this way, the ball portion 10 becomes the ball receiving portion 20 of the holder 2.
The ball shank 1 enclosed in is completed.

Thereafter, an external force is applied to the holder 2 or the ball shank 1 to form a minute gap between the ball receiving portion 20 and the ball portion 10 which are still in close contact with each other. As a method of applying such an external force, for example, the outer circumference of the ball receiving portion 20 may be tapped or the ball shank 1 may be tapped in its axial direction to give a slight impact to the ball portion 10. As a result, the ball portion 10 of the ball shank 1 freely comes into sliding contact with the ball receiving portion 20 of the holder 2, and the ball shank 1 and the holder 2 are in a state of being swingably or rotatably connected.

At this time, a minute gap is formed between the metal sliding contact surface of the ball receiving portion 20 and the ball portion 10 by plastic deformation, but since the resin liner 5 is elastically deformed, the resin liner 5 is It is still in close contact with the ball portion 10. Therefore, the ball shank 1 does not rattle with respect to the holder 2 even in the unloaded state.

Finally, the boot seal 3 described above is attached between the shank 10 and the outer peripheral edge of the holder 2, and a seal pocket 30 formed by the boot seal 3 is filled with a lubricant such as grease to complete the operation. The spherical bearing of the embodiment is completed.

FIG. 10 is a front view showing another example of the resin liner 5. As described above, the holder 2 is manufactured by die casting in which the ball portion 10 is used as a core and is inserted into the casting dies 6 and 7. Since the resin liner 5 is mounted on the ball portion 10 before die casting, it is inserted into the casting molds 6 and 7 together with the ball portion 10. Further, as shown in FIG. 8, after the holder 2 is cast, the resin liner 5 is covered by the holder 2 except for the contact surface with the balls 10. Therefore, as shown in FIGS. 5 and 6, the resin liner 5 formed in a simple ring shape is in contact with the ball portion 10 at the time of die casting, but is not in contact with the casting molds 6 and 7 at all. It will be. Therefore, when the molten metal of the casting alloy is quickly injected into the cavity 8 at a high pressure, the resin liner 5 causes the ball portion 10 to move.
However, if such a situation occurs, it becomes impossible to embed the resin liner 5 in a predetermined position of the ball receiving portion 20 of the holder 2.

Therefore, the resin liner 5A shown in FIG. 10 is provided with a plurality of leg portions 54 projecting downward from the ring portion 53 surrounding the ball portion 10, and the ball portion 10 is cast into molds 6 and 7.
When set inside, the leg portion 54 is brought into contact with the edge portion of the support seat 70 of the casting mold 7. As a result, the resin liner 5A inserted into the casting molds 6 and 7 will be held in a fixed posture when the ball portion 10 is set on the support seat 70, and the high-pressure molten metal is forced into the cavity 8. Even if it is well injected, the posture mounted on the ball portion 10 is maintained. Therefore, the resin liner 5A shown in FIG.
By using, the resin liner 5A can be always embedded in a predetermined position of the ball receiving portion 20 of the holder 2. In addition, reference numeral 50 in FIG. 10 is a rotation preventing projection similar to the resin liner 5 shown in FIG. Also,
The leg portion 54 does not necessarily have to project downward from the ring portion 53, but may project upward and come into contact with the edge portion of the support seat 60 of the casting mold 6.

In the first embodiment described above, the ball shank in which the ball portion is integrally joined to the tip of the shank is shown as the inner member of the present invention, but as another example, a through hole is formed in the ball portion. Alternatively, the through hole may be used to fix the rod or the like to the ball portion.

[0033]

As described above, according to the method of manufacturing the spherical bearing of the present invention, the resin liner is molded by injection molding with the ball portion of the inner member as the core, and the resin liner is used for the ball portion. Since the ball receiving part that covers this resin liner is die cast,
Even if the oil film runs out between the ball section and the ball receiving section, the ball section comes into close contact with the resin liner integrated with the ball receiving section, which causes uneven wear of the ball section and the ball section and the ball receiving section. It is possible to prevent seizing with the receiving portion, and it is possible to obtain good swinging and rotating movements of the inner member for a long period of time.

Further, since the resin liner is injection-molded with the ball portion of the inner member as the core, the sliding contact surface of the resin liner is in contact with the ball portion without a gap, so that the inner member and the outer portion It is possible to completely eliminate rattling with the member.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a spherical bearing to which the present invention is applied.

FIG. 2 is a side view showing a spherical bearing according to the first embodiment.

FIG. 3 is a perspective view showing a usage example of the spherical bearing according to the first embodiment.

FIG. 4 is a diagram showing a load distribution around a ball portion of a ball shank in the use example of FIG.

FIG. 5 is a front view showing a state in which a resin liner is mounted on the ball portion in the method of manufacturing the spherical bearing according to the first embodiment.

FIG. 6 is a plan view showing a state in which a resin liner is mounted on the ball portion in the method of manufacturing the spherical bearing according to the first embodiment.

FIG. 7 is a cross-sectional view showing how the holder is cast with the ball portion as the core in the method of manufacturing the spherical bearing according to the first embodiment.

FIG. 8 is a cross-sectional view showing a holder that is cast in the method of manufacturing the spherical bearing according to the first embodiment.

FIG. 9 is a cross-sectional view showing how the shank is welded to the ball portion enclosed by the holder in the method of manufacturing the spherical bearing according to the first embodiment.

FIG. 10 is a diagram showing another example of the shape of the resin liner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ball shank (inner member), 2 ... Holder (outer member), 5 ... Resin liner, 10 ... Ball part, 20 ... Ball receiving part, 22 ... Sliding contact surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kunihisa Takahashi             3-11-6 Nishigotanda, Shinagawa-ku, Tokyo, T             Inside HK Corporation (72) Inventor Tomozumi Murata             3-11-6 Nishigotanda, Shinagawa-ku, Tokyo, T             Inside HK Corporation (72) Inventor Koji Ei             5600 Higashine Kou, Higashine, Yamagata Prefecture, THK stock             Company Yamagata Factory (72) Inventor Mitsuhiro Teramachi             1173 Yamanoi, Sanyo-cho, Asa-gun, Yamaguchi Prefecture, THK stock             Ceremony Yamaguchi Factory (72) Inventor Tsuyoshi Yamamoto             1173 Yamanoi, Sanyo-cho, Asa-gun, Yamaguchi Prefecture, THK stock             Ceremony Yamaguchi Factory (72) Inventor Fumiaki Morita             1173 Yamanoi, Sanyo-cho, Asa-gun, Yamaguchi Prefecture, THK stock             Ceremony Yamaguchi Factory F term (reference) 3J105 AA32 CD04 CD14 CE02 CE03                       CF12

Claims (3)

[Claims] 1. An inner member having a ball portion, and an outer member having a ball receiving portion for enclosing the ball portion of the inner member and connected to the inner member so as to swing or rotate relative to each other. A method of manufacturing a spherical bearing, comprising: a first step of mounting a resin liner on the ball portion of the inner member by injection molding using the ball portion as a core; and a ball portion on which the resin liner is mounted. In a casting mold and die-casting the ball receiving portion that covers the resin liner, and an external force is applied to the ball portion or the ball receiving portion so that the ball receiving portion is provided between the ball portion and the ball receiving portion. A method of manufacturing a spherical bearing, comprising a third step of forming a gap and allowing relative rotation between the ball portion and the ball receiving portion. 2. The method for manufacturing a spherical bearing according to claim 1, wherein the resin liner is formed in a ring shape, and a detent is formed on an outer peripheral surface of the resin liner. 3. The spherical surface according to claim 2, wherein the resin liner is provided with a leg portion which comes into contact with a casting mold during die casting and maintains the mounted state of the resin liner on a ball. Bearing manufacturing method.