JP6752041B2 - Ball joint and its bearing seat - Google Patents

Description

The present invention relates to a bearing sheet of a ball joint that holds a ball portion of a ball stud, and a ball joint provided with the bearing sheet.

Conventionally, a ball joint used for a vehicle suspension device such as an automobile or a steering device is made of a ball stud having a ball portion and a stud portion integrally and a synthetic resin that rotatably holds the ball portion of the ball stud. It is provided with a cylindrical ball sheet which is a bearing sheet such as the above, and a bottomed cylindrical housing for receiving the ball sheet holding the ball portion. A fluid grease, which is a lubricant, is interposed between the outer peripheral surface of the ball portion and the inner peripheral surface of the ball sheet to ensure good slidability when the ball portion rotates.

In such a ball joint, the so-called compression type in which the housing, the ball seat, and the ball portion of the ball stud are on the upper side and the stud portion of the ball stud is on the lower side, there is a strong demand for low torque. .. Therefore, the shape of the ball sheet is also a specification that meets this requirement. Specifically, in such a ball sheet, ribs are provided on the outer periphery of the pressure receiving portion that receives the input load, and a protrusion having a flat tip side is provided on the inner circumference, so that the contact area between the surface of the ball portion and the inner peripheral surface of the sheet is provided. Is controlled to increase the gap, and the lubricity due to the intervening lubricant is improved (see, for example, Patent Document 1).

Japanese Patent No. 5355280 (pages 4-9, Fig. 1-4)

In the case of the ball sheet described above, the contact area with the ball portion is small and the gap is large. In particular, since the ball sheet made of synthetic resin is manufactured by injection molding, in the case of a shape having a wall thickness distribution such as having ribs on the outer periphery of the pressure receiving portion, a sink mark occurs in the thick wall portion and the gap is further increased. It becomes a factor to do.

Further, for example, in the case of a so-called deformed sheet in which an end portion provided with an opening for projecting the stud portion side to the outside is incorporated into the housing and then caulked and deformed together with the housing to follow the outer circumference of the ball portion. Large deformation is accompanied by caulking deformation. In this case, the deformation rate differs between the resin ball sheet and the metal housing, and there is also a dimensional error during forging of the housing, so the outer circumference of the ball sheet and the inner circumference of the housing should be aligned without gaps. It is not easy to tighten, and it causes an increase in the gap. On the other hand, when the ball sheet is preformed so that the inner circumference is along the outer circumference of the ball portion, the removal from the mold, the assembling process, the number of parts, and the like increase, and it is not easy to improve the productivity.

When there are many gaps between the ball portion and the inner peripheral side of the pressure receiving portion as described above, the input load is concentrated and an excessively high surface pressure portion is generated in the pressure receiving portion. Therefore, further measures are required to prevent creep deformation and cracks from occurring at that site. Such a problem is not only for compression type ball joints, but also for tension type (tension type) ball joints in which the ball part of the housing, ball sheet and ball stud is on the lower side and the stud part of the ball stud is on the upper side. The same occurs not only for ball joints for vehicles, but also for ball joints used at arbitrary locations.

The present invention has been made in view of such a point, and an object of the present invention is to provide a bearing sheet of a ball joint capable of suppressing deterioration due to repeated input of a compressive load, and a ball joint provided with the bearing sheet.

The ball joint bearing sheet according to claim 1 is a ball joint bearing sheet that is housed in a housing and holds the ball portion of the ball stud via a lubricant, and is in the axial direction of the ball stud from the ball portion. The end portion has a pressure receiving portion that comes into contact with the ball portion in a slidable state while receiving a compressive load, and an opening through which a part of the ball stud is led out to the outside, and one end side of the pressure receiving portion. The pressure receiving portion is provided with a body portion located in the above, and the pressure receiving portion is adjacent to a pressure receiving portion main body having a substantially constant thickness in which the outer circumference and the inner circumference are formed spherically, and the inner circumference of the pressure receiving portion main body in the meridian direction and the weft line direction. It is provided so as to be projected and located on substantially the entire surface of the inner circumference of the pressure receiving portion main body on the other end side of the pressure receiving portion, and provided with a plurality of spherical protrusions in contact with the ball portion.

The ball joint bearing sheet according to claim 2 is the ball joint bearing sheet according to claim 1, wherein the body portion has an inner peripheral side protruding portion protruding toward the inner peripheral side of one end and a housing protruding toward the outer peripheral side. It is provided with an outer peripheral side protruding portion that press-contacts the inner peripheral side protruding portion with the ball portion by deforming along the housing by contact with.

The ball joint bearing sheet according to claim 3 is located on the other end side of the pressure receiving portion in the ball joint bearing sheet according to claim 1 or 2, and includes a lubricant accommodating portion for accommodating the lubricant inside. It is a thing.

The ball joint according to claim 4 includes a housing, a bearing sheet according to any one of claims 1 to 3 accommodated in the housing, and a ball stud having a ball portion held by the bearing sheet. It is a thing.

According to the bearing sheet of the ball joint according to claim 1, the pressure receiving portion main body of the pressure receiving portion that receives the compressive load in the axial direction of the ball stud is formed to have a substantially constant thickness with spherical outer and inner circumferences, respectively, during molding. In addition to suppressing the thinning of the bearing, a plurality of protrusions projecting adjacent to the pressure receiving portion main body in the longitudinal direction and the latitude line direction are arranged on substantially the entire surface of the other end side of the pressure receiving portion on the inner circumference of the pressure receiving portion main body. By making it spherical, it is possible to control the pressure receiving load and the lubrication state by controlling the gap formed between the ball portion and the ball portion, and it is possible to suppress deterioration due to repeated input of the compressive load.

According to the ball joint bearing sheet according to the second aspect, in addition to the effect of the ball joint bearing sheet according to the first aspect, the inner peripheral side protruding portion protruding toward the inner peripheral side of one end of the body portion is formed. Since the outer peripheral side protruding portion protruding to the outer peripheral side is deformed along this housing by contact with the housing and is pressed against the ball portion, the amount of protrusion of the inner peripheral side protruding portion is the ball portion when attached to the housing. It is possible to suppress the amount of deformation for pressure contact with the housing and set it so that it does not interfere with the removal of the mold from the molding mold after molding or the insertion of the ball portion into the bearing sheet. Therefore, it is possible to prevent an unintended gap from being formed between the ball portion and the ball portion due to excessive deformation of the inner peripheral side protruding portion when attached to the housing, and it is possible to control the pressure receiving load and the lubrication state more accurately. , The decrease in productivity can be suppressed.

According to the ball joint bearing sheet according to claim 3, in addition to the effect of the ball joint bearing sheet according to claim 1 or 2, the lubricant accommodating portion that internally accommodates the lubricant on the other end side of the pressure receiving portion. By providing the above, the lubrication state can be controlled more accurately.

According to the ball joint according to claim 4, by providing the bearing sheet according to any one of claims 1 to 3, it is possible to provide a ball joint having excellent durability against repeated compressive loads.

(a) is a cross-sectional view showing a bearing sheet of a ball joint according to the first embodiment of the present invention, and (b) is an enlarged view of a part of (a). It is sectional drawing which shows the ball joint provided with the bearing sheet as above. It is sectional drawing which shows the bearing sheet of the ball joint of the 2nd Embodiment of this invention.

Hereinafter, the configuration of the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 2, reference numeral 11 denotes a ball joint, which is used for, for example, a suspension device for a vehicle such as an automobile, a steering device, or the like. The ball joint 11 holds the socket 16 which is a housing (reception side member), the ball stud 17 which is a ball side member, and a part of the ball stud 17 so as to be slidable (rotatable). It is provided with a substantially cylindrical ball sheet 18 which is a bearing sheet accommodated in the housing, and a dust cover 19 arranged from the outer peripheral surface of the socket 16 to the outer peripheral surface of the ball stud 17, and the socket 16 is arranged with the socket 16 on the upper side. It is a compression type. Hereinafter, the lower side in FIGS. 1 and 2 will be described as a lower side which is one end side, and the upper side will be described as an upper side which is the other end side.

The socket 16 is made of metal formed into a bottomed cylinder (covered cylinder) by, for example, (cold) forging or casting. The socket 16 integrally includes a cylindrical main body 21 and a reduced diameter portion 22 continuous with the upper end of the main body 21. Further, in the socket 16, an inner chamber 23, which is an accommodating portion for accommodating the ball sheet 18, is internally partitioned, and a socket opening 24 for communicating the inner chamber 23 with the outside of the socket 16 is located at the lower end. It is formed. A cover mounting portion 25 for mounting and fixing the upper end portion of the dust cover 19 is formed on the outer periphery of the socket 16.

The reduced diameter portion 22 is formed so that the diameter is gradually reduced from the lower end side, which is the main body portion 21, to the upper end side.

The inner chamber 23 is formed in a spherical shape in which the diameter is gradually reduced from the lower end side to the upper end side over the main body portion 21 to the reduced diameter portion 22.

An annular plug 26 as a holding member for preventing the ball sheet 18 housed in the inner chamber 23 from coming off is attached to the socket opening 24 by caulking, for example.

On the other hand, the ball stud 17 is made of steel, for example, and integrally includes a spherical ball portion 28 and a shaft-shaped stud portion 29 connected to the ball portion 28.

A part of the outer peripheral surface of the ball portion 28 is slidably (rotated) held by the ball sheet 18 via a lubricant (grease) G. That is, the ball portion 28 is housed in the inner chamber 23 of the socket 16 together with the ball sheet 18.

The stud portion 29 is a portion connected to an external connected member (not shown) to which a load is applied, and protrudes outward (downward in FIG. 2) from the socket 16.

Then, as shown in FIGS. 1A and 2, the ball sheet 18 is formed in a substantially cylindrical shape, for example, made of synthetic resin having excellent wear resistance, and is fitted and held in the inner chamber 23 of the socket 16. It is contained. The ball sheet 18 integrally includes a body portion 31 which is a cylindrical seat body portion and a pressure receiving portion 32 which is continuous with the upper end of the body portion 31. An air release groove for releasing air when the ball sheet 18 is assembled to the inner chamber 23 of the socket 16 is provided on the outer circumference of the ball sheet 18 at at least one of the body portion 31 and the pressure receiving portion 32. You may.

The body portion 31 is located on the lower end side of the pressure receiving portion 32, and is a portion located inside the main body portion 21 of the socket 16 with the ball sheet 18 fitted in the inner chamber 23. An opening 34 is provided at the lower end of the body portion 31. Further, at the lower end of the body portion 31, as shown in FIG. 1A, an inner peripheral side protruding portion 36 protruding inward and an outer peripheral side protruding portion 37 protruding outward are respectively. It is formed. Further, the lower end portion of the body portion 31 is in contact with the plug 26 attached to the socket 16 in a state where the ball sheet 18 is housed in the inner chamber 23 of the socket 16 as shown in FIG. In addition, a plurality of recesses (dimples) accommodating the lubricant G may be provided on the inner circumference of the body portion 31 at substantially equal intervals in the circumferential direction.

The opening 34 communicates with the socket opening 24 of the socket 16 with the ball sheet 18 fitted in the inner chamber 23, and leads the stud portion 29 side of the ball stud 17 to the outside of the socket 16.

The inner peripheral side protruding portion 36 shown in FIG. 1A constitutes an edge portion of the opening 34. The inner peripheral side protrusion 36 is the lower end from the position corresponding to the equator position E (the maximum diameter position of the ball portion 28 in the axial direction of the ball stud 17) of the ball portion 28 on the inner circumference of the body portion 31 shown in FIG. It is curved so as to gradually protrude toward the central axis side (inward). Further, as shown in FIG. 1A, the inner peripheral side protrusion 36 is in a state where the ball sheet 18 is a single unit, that is, in a state where the ball sheet 18 is not housed in the inner chamber 23 (FIG. 2) of the socket 16. The shape is slightly separated from the outer peripheral shape of the ball portion 28.

The outer peripheral side protruding portion 37 is located on the outer periphery of the lower end portion of the body portion 31 (ball sheet 18), that is, on the back surface side of the inner peripheral side protruding portion 36. The outer peripheral side protruding portion 37 is curved so as to gradually protrude in the radial direction (outward) from the lower side to the lower end side of the ball portion 28 at the equator position E (FIG. 2) on the outer peripheral side of the body portion 31. Is formed. Further, the outer peripheral side protruding portion 37 has a shape with respect to the shape of the inner chamber 23 (FIG. 2) in the state of the ball sheet 18 alone, that is, in the state where the ball sheet 18 is not accommodated in the inner chamber 23 (FIG. 2) of the socket 16. It has a shape that slightly protrudes outward.

Then, as shown in FIG. 2, the outer peripheral side protruding portion 37 is pushed toward the central axis side (inward) along the inner surface of the inner chamber 23 in a state where the ball sheet 18 is housed and held in the inner chamber 23 of the socket 16. By being deformed so as to be deformed, the inner peripheral side protruding portion 36 is curved along the outer peripheral shape of the ball portion 28, and is elastically compressed with respect to the outer peripheral surface of the ball portion 28 so as to be in close contact with the liquid. It is configured in.

Therefore, the lower end of the body portion 31 of the ball sheet 18 is a semi-molded type that is slightly deformed by assembling the ball sheet 18 to the inner chamber 23 of the socket 16 and adheres to the outer peripheral surface of the ball portion 28. .. Here, the semi-molded type means that the inner peripheral side (inner peripheral side protruding portion 36) of the lower end portion of the body portion 31 is curved in a spherical shape in close contact with the outer peripheral surface of the ball portion 28 to be projected, and the lower end portion is projected. A so-called molding type in which the outer peripheral side is not substantially projected, and a ball sheet 18 is assembled to the inner chamber 23 of the socket 16 by projecting the outer peripheral side greatly without forming a protruding portion on the inner peripheral side of the lower end portion of the body portion 31 in advance. By caulking and deforming the socket 16, the lower end of the body portion 31 is greatly deformed together with the socket 16, which means an intermediate degree with the so-called deformation type in which the lower end portion of the body portion 31 is in close contact with the outer peripheral surface of the ball portion 28. That is, the lower end of the body portion 31 of the semi-molded type of the ball sheet 18 has a smaller amount of protrusion to the inner peripheral side (the amount of protrusion of the inner peripheral side protruding portion 36) than the molded type, and is closer to the outer peripheral side than the modified type. The amount of protrusion (the amount of protrusion of the outer peripheral side protrusion 37) is small.

Further, the pressure receiving portion 32 is located inside the reduced diameter portion 22 of the socket 16 with the ball sheet 18 fitted in the inner chamber 23, and is located in the axial direction (upward direction) from the ball portion 28 to the ball stud 17. It is a portion that comes into contact with the ball portion 28 in a slidable state while receiving a compressive load. As shown in FIG. 1A, the pressure receiving portion 32 integrally includes a pressure receiving portion main body 41 and a plurality of protrusions 42 projecting from the inner circumference of the pressure receiving portion main body 41. Further, the pressure receiving portion 32 is provided with an end opening 43 at the upper end, that is, at the end opposite to the body portion 31.

The pressure receiving portion main body 41 has an outer circumference 41a facing (adhering) to the inner chamber 23 (FIG. 2) of the socket 16 and an inner circumference 41b facing the ball portion 28, each of which is formed in a spherical shape having substantially constant dimensions. The thickness is almost constant. That is, the pressure receiving portion main body 41 has a shape in which there is substantially no distribution (bias) in wall thickness.

A plurality of protrusions 42 are arranged adjacent to each other in the meridian direction and the latitude line direction of the inner circumference 41b of the pressure receiving portion main body 41, and are located on substantially the entire upper surface of the inner circumference 41b of the pressure receiving portion main body 41. Each of these protrusions 42 is formed in a curved surface shape, preferably in a spherical shape, and the tip end side constitutes a sliding contact portion that is in sliding contact with the outer peripheral surface of the ball portion 28. That is, each of these protrusions 42 is in point-like contact with the outer peripheral surface of the ball portion 28. As shown in an enlarged view in FIG. 1 (b), these protrusions 42 have a smaller maximum protrusion dimension from the inner circumference 41b of the pressure receiving portion main body 41 with respect to the radius of curvature (for example, 1/10 or less). It has a shallow protruding shape.

The end opening 43 shown in FIG. 1A is provided so as to penetrate the pressure receiving portion main body 41 in the thickness direction. The end opening 43 is formed to have a smaller diameter than the opening 34. The end opening 43 serves as a lubricant reservoir for accumulating the lubricant G.

Further, the dust cover 19 shown in FIG. 2 is also called a dust seal or a boot, and covers the socket opening 24 of the socket 16 regardless of the swing of the ball stud 17, and the moisture inside the socket 16 or the ball sheet 18. And to prevent the invasion of dust and the like. The dust cover 19 is formed in a substantially cylindrical shape using, for example, synthetic resin, the lower end side is fixed to the outer peripheral surface of the stud portion 29 of the ball stud 17, and the upper end side is fitted to the cover mounting portion 25 of the socket 16. It is tightened and fixed by a ring-shaped fixing member 45 attached to the outer peripheral surface of the.

Next, the assembly operation of the first embodiment will be described with reference to FIGS. 1 and 2.

First, the ball sheet 18 is formed in advance by injection molding using a molding die (mold) (not shown). At this time, in the ball sheet 18, the outer circumference 41a and the inner circumference 41b of the pressure receiving portion main body 41 of the pressure receiving portion 32 are spherical and do not have a wall thickness distribution, so that the pressure receiving portion 32 is less likely to be sinked and is easily omitted. It is molded to a constant thickness. Further, since the amount of protrusion of the inner peripheral side protrusion 36 at the lower end of the body portion 31 is smaller than that of the molding type, the mold can be removed relatively easily without forcibly removing the mold after molding.

Next, the separately formed ball portion 28 is press-fitted into the inside of the ball sheet 18 through the opening 34. At this time, since the amount of protrusion of the inner peripheral side protruding portion 36 of the body portion 31 of the ball sheet 18 is smaller than that of the molded type, the ball portion 28 can be press-fitted relatively easily. The stud portion 29 may be integrally molded with the ball portion 28, or may be later connected to the ball portion 28 by welding or the like. Further, the lubricant G may be applied to the ball portion 28 to be press-fitted into the ball sheet 18, or may be injected into the ball sheet 18 in a later step.

Then, the ball sheet 18 holding the ball portion 28 is press-fitted into the inner chamber 23 of the socket 16 separately formed by forging or casting. At this time, the outer peripheral side protruding portion 37 is deformed inward along the inner chamber 23 toward the central axis side, so that the inner peripheral side protruding portion 36 is pressed against the outer peripheral surface of the ball portion 28. Further, the plug 26 is inserted into the stud portion 29 of the ball stud 17 and attached to the socket 16, and the lower end side of the socket 16 is crimped and deformed toward the center side to deform the plug 26 to the inner edge of the socket opening 24 of the socket 16. Hold in the part. As a result, the ball sheet 18 is fixed together with the ball stud 17 in the inner chamber 23 of the socket 16 in a detented state.

After that, the dust cover 19 is inserted into the stud portion 29 of the ball stud 17, and the upper end side of the dust cover 19 is tightened and fixed to the cover mounting portion 25 by the fixing member 45, and the lower end side of the dust cover 19 is balled. The ball joint 11 is completed by fixing it to the outer circumference of the stud portion 29 of the stud 17.

In the ball joint 11 formed in this way, when a load from the vehicle body side is applied to the ball stud 17, the ball stud 17 swings in the left-right direction. At this time, the ball portion 28 is supported by a plurality of curved (spherical) protrusions 42, and the lubricant G is interposed between the ball portion 28 and the ball sheet 18, so that the pressure receiving load and lubrication The state is controlled, and the ball portion 28 smoothly rotates (slides).

That is, in the present embodiment, the pressure receiving portion main body 41 of the pressure receiving portion 32 that receives the compressive load in the axial direction of the ball stud 17 has a substantially constant thickness in which the outer circumference 41a and the inner circumference 41b are spherical, respectively, at the time of molding. It suppresses thinning, can accurately control the gap between the ball sheet 18 (inner circumference 41b of the pressure receiving part main body 41) and the ball part 28, and has a curved surface of a plurality of protrusions 42 protruding from the pressure receiving part main body 41. By forming the shape (spherical shape), the influence of the twist (deflection) of the ball sheet 18 that occurs at the contact portion with the ball portion 28 is suppressed, and fine dents between the protrusions 42 are intentionally arranged to provide the lubricant G. It is possible to improve the holding property of the ball portion 28 and increase the contact area of the ball portion 28 with respect to the outer peripheral surface. In other words, by making these protrusions 42 curved (spherical), poor lubrication such as all of the lubricant G that should originally be interposed is pushed out by the solid contact between the ball sheet 18 and the ball portion 28 does not occur. The space required for this can be secured. As a result, the pressure receiving load and the lubrication state can be controlled by controlling the gap formed between the ball sheet 18 and the ball portion 28. Therefore, it is possible to suppress the occurrence of a portion where the compressive load is concentrated and the surface pressure becomes excessively high, and it is possible to suppress the occurrence of creep deformation and cracks due to the excessive surface pressure, so that the compression load can be repeatedly input. It is possible to suppress the resulting sheet destruction, that is, deterioration (sagging) of the ball sheet 18.

Further, the inner peripheral side protruding portion 36 protruding toward the inner peripheral side of the lower end portion of the body portion 31 is projected to the outer peripheral side, and the outer peripheral side protruding portion 37 protrudes to the outer peripheral side, and the socket 16 comes into contact with the inner chamber 23 of the socket 16. Since the ball portion 28 is pressed against the ball portion 28 by deforming along the inner chamber 23, the amount of deformation for pressing the protrusion amount of the inner peripheral side protruding portion 36 to the ball portion 28 when attached to the socket 16 is minimized. It can be set so as not to be an obstacle when the ball portion 28 is removed from the molding die or the ball portion 28 is inserted into the ball sheet 18 after molding. Therefore, it is possible to prevent an unintended gap from being formed between the ball sheet 18 and the ball portion 28 due to excessive deformation of the inner peripheral side protruding portion 36 when attached to the socket 16, and it is possible to prevent an unintended gap from being formed, and a pressure receiving load and a lubricated state. Can be controlled more accurately, and the decrease in productivity can be suppressed by suppressing the forcible removal from the molding die, the assembly process, and the increase in the number of parts.

By providing such a ball sheet 18 in the ball joint 11, it is possible to suppress problems such as rattling with the ball portion 28 due to deterioration (sagging) of the ball sheet 18, and to prevent repeated compression loads. A ball joint 11 having excellent durability can be provided.

Next, the second embodiment will be described with reference to FIG. The same components and operations as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this second embodiment, the lubricant accommodating portion 51 for accommodating the lubricant G is provided at the upper end portion of the ball sheet 18 of the first embodiment.

The lubricant accommodating portion 51 is continuous with the upper end portion opposite to the body portion 31 with respect to the pressure receiving portion 32. The lubricant accommodating portion 51 is formed in a cylindrical shape and is located coaxially with the pressure receiving portion 32. Further, the lubricant accommodating portion 51 projects upward with respect to the pressure receiving portion 32. Further, an end opening 43 is provided at the upper end of the lubricant accommodating portion 51.

Then, by providing the lubricant accommodating portion 51 for accommodating the lubricant G inside on the upper end side of the pressure receiving portion 32 in this way, the retention of the lubricant G can be improved, and the lubrication accommodated in the lubricant accommodating portion 51 can be improved. The agent G can more accurately control the lubrication state between the ball sheet 18 and the ball portion 28.

In each of the above embodiments, the protrusion 42 is not limited to a spherical shape, but may have a curved surface shape such as a spheroidal shape.

Further, the ball joint 11 is not limited to the suspension device of the vehicle, and can be used for, for example, a steering device and other devices.

Further, the ball joint 11 can be used not only for vehicles but also for any other purpose.

The present invention can be suitably used for, for example, a suspension device for a vehicle such as an automobile.

11 ball joint
16 housing socket
17 ball stud
18 Ball seat, which is a bearing seat
28 Ball part
31 Torso
32 Pressure receiving part
34 opening
36 Inner circumference side protrusion
37 Outer peripheral protrusion
41 Pressure receiving part body
41a circumference
41b inner circumference
42 protrusions
51 Lubricant housing G Lubricant

Claims (4)

A ball joint bearing sheet that is housed in a housing and holds the ball portion of a ball stud via a lubricant.
A pressure receiving portion that comes into contact with the ball portion in a slidable state while receiving a compressive load in the axial direction of the ball stud from the ball portion.
It has an opening at the end where a part of the ball stud is led out to the outside, and has a body portion located on one end side of the pressure receiving portion.
The pressure receiving part is
A pressure receiving part body with a substantially constant thickness, each of which has a spherical outer circumference and an inner circumference,
A spherical surface that is projected adjacent to the inner circumference of the pressure receiving portion main body in the meridian direction and the latitude line direction, is located on substantially the entire surface of the inner circumference of the pressure receiving portion main body on the other end side of the pressure receiving portion, and is in contact with the ball portion. A ball joint bearing seat characterized by having multiple protrusions in the shape. The body is
The inner peripheral side protruding part protruding to the inner peripheral side of one end,
The ball according to claim 1, further comprising an outer peripheral side protruding portion that protrudes toward the outer peripheral side and deforms along the housing by contact with the housing to bring the inner peripheral side protruding portion into pressure contact with the ball portion. Bearing seat for joints. The bearing sheet for a ball joint according to claim 1 or 2, which is located on the other end side of the pressure receiving portion and includes a lubricant accommodating portion for accommodating a lubricant inside. Housing,
The bearing seat according to any one of claims 1 to 3 housed in this housing.
A ball joint characterized by being provided with a ball stud having a ball portion held by the bearing seat.

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