JP7140368B2 - Ball joint bearing seat and ball joint - Google Patents

Description

The present invention relates to a bearing seat for a ball joint provided with a lubricant reservoir, and a ball joint provided with this bearing seat.

2. Description of the Related Art Conventionally, ball joints have been used in stabilizer links used in stabilizer devices for vehicles such as automobiles.

The ball joint includes a ball stud which is a ball side member having a ball portion, a cylindrical bearing seat which rotatably holds the ball portion of the ball stud, and a receiving side which receives the bearing seat holding the ball portion. and a housing, which is a member.

The bearing seat rotatably holds the ball portion via a lubricant, and ensures slidability and durability with respect to the ball portion. Such a bearing seat is provided with a lubricant reservoir for retaining the lubricant (see, for example, Patent Document 1).

When manufacturing a ball joint, there is a manufacturing method in which a ball portion fitted with a bearing seat is mounted as a core in a mold, and a resin housing is injection molded in the mold so as to cover the bearing seat. In this case, injection molding is performed while the lubricant is injected into the lubricant reservoir of the bearing seat. There is a possibility that the lubricant that has been applied may flow out from between the ball portion and the bearing seat. In addition, in a manufacturing method other than injection molding, or in the state of use of a ball joint, when a load is applied so as to crush the lubricant reservoir, the lubricant injected into the lubricant reservoir is removed from the ball. There is a possibility that it will flow out from between the part and the bearing seat.

JP 2012-92865 A (page 7, FIG. 1)

In a conventional bearing seat, the lubricant reservoir may be crushed and the lubricant may flow out from between the ball portion and the bearing seat.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bearing seat for a ball joint and a ball joint that can prevent lubricant from flowing out from between the ball portion and the ball portion.

The bearing seat of the ball joint according to claim 1 is arranged between the ball portion of the ball-side member and the receiving-side member that receives the ball portion, and holds the ball portion rotatably via a lubricant. A bearing seat for a joint, which is formed in a cylindrical shape having an opening through which the ball portion is inserted and a bottom portion on the opposite side of the opening portion. a seat body having a sliding surface that movably contacts; a lubricant reservoir provided at the bottom of the seat body recessed from the sliding surface; and a lubricant reservoir at the bottom of the seat body. It protrudes radially from the center toward the opening , and gradually tapers toward the center of the lubricant reservoir. and a protruding portion in contact with the contact.

The bearing seat of the ball joint according to claim 2 is arranged between the ball portion of the ball-side member and the receiving-side member that receives the ball portion, and holds the ball portion rotatably via a lubricant. A bearing seat for a joint, which is formed in a cylindrical shape having an opening through which the ball portion is inserted and a bottom portion on the opposite side of the opening portion. a seat body having a sliding surface that movably contacts; a lubricant reservoir provided at the bottom of the seat body recessed from the sliding surface; and a lubricant reservoir at the bottom of the seat body. A protruding portion radially protruding from the center toward the opening portion side and slidably contacting the ball portion ; a plurality of first grooves recessed from the moving surface and extending from the bottom side to the opening side and communicating only with the lubricant reservoir and the lubricant reservoir of the opening; The lubricant reservoir is provided on the sliding surface of the seat body so as to be recessed from the sliding surface without notching up to the outer surface side of the seat body, and extends from the opening side toward the bottom side. and a plurality of second grooves communicating only with the openings of the openings, wherein the first grooves and the second grooves are alternately arranged in the circumferential direction of the sliding surface. There is.

The ball joint bearing seat according to claim 3 is characterized in that, in the ball joint bearing seat according to claim 2, the end side of the first groove toward the opening side and the second groove toward the bottom side The end portion side of the groove portion is arranged at a position overlapping the sliding surface in the circumferential direction.

A ball joint according to claim 4 is arranged between a ball-side member having a ball portion, a receiving-side member for receiving the ball portion, and the ball portion and the receiving-side member. and a bearing seat according to any one of claims 1 to 3 for rotatably holding the part.

According to the ball joint bearing seat of claim 1, the bottom of the seat body is provided with a lubricant reservoir that is recessed from the sliding surface, and the lubricant is radially distributed from the center of the lubricant reservoir toward the opening side. Since the protruding portion is provided so as to protrude and slidably contact the ball portion, it is possible to reliably prevent the lubricant reservoir from being crushed by the radial protruding portion, thereby preventing the lubricant from flowing out from between the ball portion and the ball portion. can be prevented.

According to the ball joint bearing seat of claim 2, in addition to the effect of the ball joint bearing seat of claim 1, the sliding surface of the seat body is provided with a plurality of first lubricants communicating only with the lubricant reservoir. and a plurality of second grooves communicating only with the openings, and these first grooves and second grooves are alternately arranged in the circumferential direction of the sliding surface. In addition, the lubricant in the lubricant reservoir can be prevented from directly flowing out to the opening.

According to the ball joint bearing seat of claim 3, in addition to the effect of the ball joint bearing seat of claim 2, Since the second groove portion and the end portion side of the second groove portion are overlapped in the circumferential direction of the sliding surface, the lubricant flows from the first groove portion to the second groove portion as the ball portion rotates in the circumferential direction. It is easy to move and can supply lubricant to the entire sliding surface.

According to the ball joint of claim 4, since the bearing seat of any one of claims 1 to 3 is provided, the slidability and durability of the ball portion can be ensured.

1 is a plan view of a bearing seat showing an embodiment of the invention; FIG. FIG. 1A is a cross-sectional view of the same bearing seat as viewed from FIG. 1A. FIG. 1B is a cross-sectional view of the same bearing seat as viewed from FIG. 1B. FIG. 1C is a cross-sectional view of the same bearing seat as viewed from FIG. 1C-C. FIG. 2D is a cross-sectional view of the same bearing seat as viewed in FIG. 2D. FIG. 2E is a cross-sectional view of the same bearing seat as viewed from FIG. 2E. It is a perspective view of a bearing seat same as the above. Fig. 2 is a cross-sectional view of a ball joint using the same bearing sheet;

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 8, 10 is a ball joint. The ball joint 10 forms part of a stabilizer link used in a stabilizer device for vehicles such as automobiles. The stabilizer device constitutes a part of a suspension device used for left and right wheels, for example, and suppresses rolling of the vehicle during cornering or the like. Note that roll refers to rotation of the vehicle about an axis extending in the longitudinal direction of travel of the vehicle. The stabilizer link connects the suspension arm, which is a wheel support member as a connected portion that elastically supports the wheel, and the stabilizer bar so as to be relatively movable.

The ball joint 10 includes a link portion 15 as a connecting member, a bearing seat 16, a ball stud 17 as a ball side member, a housing 18 as a receiving side member, and a dust cover as a closing member (not shown). there is In the following description, the vertical direction of each component of the ball joint 10 corresponds to the vertical direction in the state shown in FIG. The longitudinal direction of the ball stud 17 in its upright (neutral) state, that is, the up-and-down direction in FIG. Therefore, the center axis of the ball joint 10 is assumed to match (including substantially match) the center axis of the ball stud 17 in the upright state (neutral state).

The link portion 15 is made of metal, for example, and is elongated. A circular hole 21 is provided on one end side of the link portion 15 along the vertical direction, which is a direction crossing (perpendicular to) the longitudinal direction of the link portion 15 . A ball joint 10 similar to that on the one end side may be formed on the other end side of the link portion 15, though not shown.

Moreover, the bearing seat 16 is formed in a cylindrical shape, for example, from a synthetic resin having excellent abrasion resistance. Further, the bearing seat 16 is made of a synthetic resin having a higher melting point than the molding temperature (injection temperature) of the housing 18, and is formed in a cylindrical shape. The bearing seat 16 is arranged in the hole 21 of the link portion 15 and covered with the housing 18 . That is, this bearing seat 16 has an axial direction along the vertical direction.

The ball stud 17 is made of steel, for example, and integrally includes a spherical ball portion 24 and an axial stud portion 25 connected to the ball portion 24 .

A portion of the surface of the ball portion 24 is slidably (rotatably) held by the bearing seat 16 via a lubricant (grease). That is, the ball portion 24 is housed in the hole portion 21 of the link portion 15 together with the bearing seat 16 . In the present embodiment, the central portion of the ball portion 24 substantially coincides with the central portion of the link portion 15 in the vertical direction, which is the thickness direction (the direction orthogonal to the longitudinal direction). In other words, the center portion of the ball portion 24 is positioned on the center line of the link portion 15 in the thickness direction.

The stud portion 25 is a portion connected to a suspension arm or a stabilizer bar to which a load is applied, and protrudes outward (upward in FIG. 8) from the link portion 15 and the housing 18 . The stud portion 25 is exposed outside from the bearing seat 16 and extends upward with respect to the hole portion 21 . A male threaded portion 26 is formed as a connecting portion on the tip end side of the stud portion 25, that is, on the side opposite to the ball portion 24. As shown in FIG. Further, in the present embodiment, the stud portion 25 is formed with a collar portion 27 as, for example, a connection stabilizing portion.

The male threaded portion 26 is inserted through an insertion hole (not shown) formed in, for example, a suspension arm or a stabilizer bar, and a nut or the like is screwed thereon, thereby turning the ball stud 17 (stud portion 25) into a suspension arm or a stabilizer bar. This is the part that connects to the bar side.

The collar part 27 is in surface contact with the suspension arm or stabilizer bar side to secure a contact area between the ball joint 10 side and the suspension arm or stabilizer bar side, thereby stabilizing the connection state by the male screw part 26. is.

The housing 18, which is also called a socket, is injection molded from synthetic resin, for example. The housing 18 is formed integrally with the bearing seat 16 to cover the end portion side of the link portion 15 . That is, the housing 18 internally holds the bearing seat 16 containing the ball portion 24 together with the end portion side of the link portion 15 . The housing 18 includes a link portion covering portion 30 as a connecting member covering portion that covers the end portion side of the link portion 15, and a bearing as a sheet member covering portion that covers and holds the bearing seat 16 including the hole portion 21. A sheet covering portion 31 is integrally provided. The housing 18 also has a housing opening 32 at the top through which the stud portion 25 of the ball stud 17 protrudes. Further, the housing 18 has a cover mounting portion 33 for mounting a dust cover on its top.

The link portion covering portion 30 is formed so as to cover the portion extending from the upper and lower surfaces to the side surfaces of the link portion 15 with, for example, a substantially constant thickness.

The bearing seat covering portion 31 continuously covers the link portion covering portion 30 and extends beyond the link portion 15 to the upper portion of the upper end portion of the bearing seat 16 . That is, the bearing seat covering portion 31 includes a pressing portion 34 that wraps the upper side of the link portion 15 and presses the outer edge portion of the bearing seat 16 from above. Further, the bearing seat covering portion 31 continues from the link portion covering portion 30 and covers the bottom portion of the bearing seat 16 beyond the link portion 15 . That is, the bearing seat covering portion 31 has a holding portion 35 that holds the bottom portion of the bearing seat 16 .

The housing opening 32 is formed in communication with the bearing seat 16 and gradually widens upward.

The cover mounting portion 33 is continuous with the upper portion of the pressing portion 34 of the bearing seat covering portion 31 and protrudes upward. The cover mounting portion 33 protrudes upward from the link portion covering portion 30 and rises from the peripheral edge of the housing opening portion 32 . This cover attachment portion 33 is formed in a groove shape that is continuous over the entire circumference.

The dust cover, also called a dust seal or boot, covers the housing opening 32 of the housing 18 regardless of the swinging motion of the ball stud 17, and prevents moisture and dust from entering the housing 18 or the bearing seat 16. It is something to do. This dust cover is made of synthetic resin, for example, and has a substantially cylindrical shape. 33, and is tightened and fixed by a ring-shaped fixing member (not shown) attached to the outer peripheral surface on the upper end side.

Here, a method for manufacturing the ball joint 10 will be described.

A first intermediate body is formed by disposing the bearing seat 16 and the ball portion 24 in the hole portion 21 of the link portion 15 while the ball portion 24 of the ball stud 17 is rotatably held by the bearing seat 16 .

The first intermediate is set in the cavity of the molding die (metal mold), and synthetic resin is injected into the cavity covering the end side including the hole 21 of the link part 15 and the bearing seat 16 arranged in this hole 21. and the housing 18 is molded. As a result, the bearing seat 16 that rotatably retains the ball portion 24 of the ball stud 17 forms a second intermediate body housed and retained inside the housing 18 .

After that, the mold is opened, the second intermediate body is removed from the mold, and the ball joint 10 is manufactured by performing predetermined finishing such as fitting a dust cover.

Next, the construction of the bearing seat 16 will be described with reference to FIGS. 1 to 7. FIG.

The bearing seat 16 has a seat body 40 . The seat body 40 is formed in a cylindrical shape, for example, from a synthetic resin having excellent abrasion resistance. The seat main body 40 includes a cylindrical portion 42 having an opening 41 formed on the upper end side, which is one axial end side, and a cylindrical portion 42 formed on the lower end side opposite to the opening 41 side of the cylindrical portion 42. It has a bottom portion 43 that closes the bottom side of the portion 42 . Inside the seat body 40, an inner chamber 44 is provided in which the ball portion 24 is rotatably accommodated.

The opening 41 of the cylindrical portion 42 is formed to have an inner diameter smaller than the maximum diameter of the ball portion 24 . The ball portion 24 is press-fitted into the opening portion 41 of the cylindrical portion 42, and the cylindrical portion 42 is elastically deformed so that the ball portion 24 is inserted through the opening portion 41 and enters the inner chamber 44. As shown in FIG.

The tubular portion 42 has a sliding surface 47 that slidably contacts the surface of the ball portion 24 . That is, the sliding surface 47 is formed on the inner surface of the seat body 40 closer to the opening 41 than the bottom 43 is. The sliding surface 47 is formed in a concave spherical shape corresponding to the surface shape of the ball portion 24 . A plurality of rib portions 48 that contact the inner peripheral surface of the hole portion 21 of the link portion 15 protrude from the outer peripheral surface of the cylindrical portion 42 along the axial direction.

The bottom portion 43 has a bottom surface portion 51 whose inner surface side faces the opening portion 41 and whose outer surface side is flat, and an inclined surface portion 52 which is formed so as to continue from the peripheral portion of the bottom surface portion 51 to the tubular portion 42. have.

Further, the bottom portion 43 includes a lubricant reservoir 55 recessed from the sliding surface 47 and a projecting portion 56 radially projecting from the center of the lubricant reservoir 55 toward the opening 41 side. there is

The lubricant reservoir 55 is a gap formed between itself and the ball part 24, and has a structure in which the lubricant is accumulated in this gap. This lubricant reservoir 55 includes a plurality of gap regions 57 formed between the plurality of radial portions of the projecting portion 56, and a communication region 58 extending from the gap regions 57 to the lower side of the sliding surface 47. . The communication region 58 is a region continuous in the circumferential direction of the bottom portion 43 between the projecting portion 56 and the sliding surface 47 .

The protrusion 56 has a central protrusion 59 in the center of the lubricant reservoir 55 and a plurality of radial protrusions 60 radially protruding from the central protrusion 59 . The central protruding portion 59 protrudes from the center of the bottom portion 43 (bottom portion 51). The radial projecting portion 60 projects from the bottom portion 43 (lubricant reservoir portion 55) so as to have a substantially mountain-shaped cross section. The tip of the radial protrusion 60 radially extending from the central protrusion 59 faces toward the sliding surface 47 but is separated from the sliding surface 47 without being connected thereto. A communicating region 58 of the lubricant reservoir 55 is formed between the .

A plurality of radial protrusions 60 are formed at predetermined angular intervals in the circumferential direction around the central protrusion 59 . In the present embodiment, they are formed at every 60 degrees in the circumferential direction around the central projecting portion 59 . Furthermore, in the present embodiment, there are six radially projecting portions 60, and the radially projecting portions 60 facing each other centering on the central projecting portion 59 are positioned on a straight line. In addition, the number of radial protrusions 60 is not limited to six, and may be less or more than six.

A sliding surface portion 61 that slidably contacts the surface of the ball portion 24 is formed on the surface of the projecting portion 56 . The sliding surface portion 61 has a concave spherical shape corresponding to the surface shape of the ball portion 24, and is formed in a concave spherical shape having the same radius from the center point of the concave spherical surface of the sliding surface 47 and from this center point. . That is, the sliding surface portion 61 is formed in a concave spherical shape on the same surface as the sliding surface 47 .

The seat body 40 also has a plurality of first grooves 62 and a plurality of second grooves 63 which are recessed from the sliding surface 47 and elongated along the axial direction.

The first groove portion 62 is provided along the axial direction on the sliding surface 47 from the bottom portion 43 side toward the opening portion 41 side. The side ends remain within the region of the sliding surface 47 and are not communicated with the opening 41 .

The second groove portion 63 is provided on the sliding surface 47 along the axial direction from the opening portion 41 side toward the bottom portion 43 side, and the end portion on the opening portion 41 side is communicated with the opening portion 41, and the bottom portion 43 side is connected to the opening portion 41 side. The end remains within the area of the sliding surface 47 and is not communicated with the lubricant reservoir 55 .

These first grooves 62 and second grooves 63 are alternately arranged in the circumferential direction of the sliding surface 47 . Further, the first groove portion 62 and the second groove portion 63 are positioned away from positions radially facing the respective radial projection portions 60 of the projection portion 56, and are adjacent radial projection portions of the projection portion 56. It is arranged at a position facing between the portions 60 , that is, at a position facing each gap region 57 of the lubricant reservoir 55 .

Furthermore, the upper end side, which is the end side of the first groove portion 62 toward the opening portion 41 side, and the lower end side, which is the end portion side of the second groove portion 63 toward the bottom portion 43 side, are arranged at overlapping positions in the circumferential direction. The axial length of the second groove portion 63 is longer than the axial length of the first groove portion 62 . The upper end side of the first groove portion 62 is located below the intermediate position in the axial direction of the sliding surface 47 (the position where the sliding surface 47 in the direction perpendicular to the axial direction has the maximum diameter). The lower end side of the second groove portion 63 is located below the middle position in the vertical direction of the sliding surface 47, and the upper end side of the first groove portion 62 and the lower end side of the second groove portion 63 slide. It is arranged at a position overlapping the surface 47 in the circumferential direction.

Then, the action of the bearing seat 16 will be explained.

When manufacturing the ball joint 10 described above, after injecting the lubricant from the opening 41 of the seat body 40 into the interior (lubricant reservoir 55), the ball portion 24 of the ball stud 17 is inserted into the seat body 40 from the opening 41. to hold the ball portion 24 in the bearing seat 16.

The ball portion 24 fitted with the bearing seat 16 is set in a cavity of a molding die in a state of being combined with the link portion 15, and a synthetic resin is injected into the cavity while covering the bearing seat 16 to form the housing 18.例文帳に追加

When the housing 18 is injection molded, molding heat and pressure are applied from the outer surface side of the bearing seat 16 . At this time, the protruding portion 56 protruding from the lubricant reservoir 55 contacts the ball portion 24, and the bearing seat 16 (bottom portion 43) is supported against the ball portion 24 by the protruding portion 56, so that the lubricant reservoir 55 is prevent it from collapsing. That is, the radial protrusions 56 prevent the gap regions 57 formed between the radial protrusions 60 from being crushed by the molding heat and pressure applied from the outer surface side of the bearing seat 16 . Furthermore, since the plurality of radially projecting portions 60 of the projecting portion 56 approach toward the sliding surface 47, the communication area of the lubricant reservoir portion 55 between the plurality of radially projecting portions 60 and the sliding surface 47 is reduced. It prevents 58 from being crushed by molding heat and pressure applied from the outer surface side of bearing seat 16 .

Therefore, in the manufactured ball joint 10 , the lubricant is reliably held in the lubricant reservoir 55 of the bearing seat 16 .

When the ball joint 10 operates, the lubricant in the lubricant reservoir 55 is supplied to the entire space between the ball portion 24 and the bearing seat 16, and the slidability and durability between the ball portion 24 and the bearing seat 16 are improved. is ensured.

The lubricant held in the lubricant reservoir 55 is supplied to the sliding surface portion 61 side of the protruding portion 56 by the relative rocking or rotating motion between the ball portion 24 and the bearing seat 16. , is supplied to the upper sliding surface 47 side.

A part of the lubricant supplied to the sliding surface 47 side enters the plurality of first grooves 62 communicating with the lubricant reservoir 55, and flows from these first grooves 62 to the sliding surface 47 side. It is supplied to the region on the bottom 43 side, which is the region on the lower side of the sliding surface 47 . Furthermore, part of the lubricant supplied from the first groove portion 62 to the sliding surface 47 side is caused by the relative rocking and turning motions between the ball portion 24 and the bearing seat 16, causing a plurality of second 2 grooves 63, and is also supplied from these second grooves 63 to the sliding surface 47 side, that is, the region on the opening 41 side, which is the upper side of this sliding surface 47. As shown in FIG. Since the first grooves 62 and the second grooves 63 are alternately arranged in the circumferential direction of the sliding surface 47 , the lubricant in the lubricant reservoir 55 is supplied to the entire sliding surface 47 . In addition, the lubricant in the lubricant reservoir 55 is prevented from directly flowing out to the opening 41 . Furthermore, since the first groove portion 62 and the second groove portion 63 are arranged at positions overlapping each other in the circumferential direction of the sliding surface 47, the lubricant is dispensed as the ball portion 24 rotates in the circumferential direction. It is easy to move from the first groove portion 62 to the second groove portion 63 , and the lubricant is easily supplied to the entire sliding surface 47 .

As described above, according to the bearing seat 16 of the present embodiment, the lubricant reservoir 55 recessed from the sliding surface 47 is provided in the bottom 43 of the seat body 40, and the lubricant reservoir 55 is opened from the center thereof. Since the projecting portion 56 radially projecting toward the portion 41 and slidably contacting the ball portion 24 is provided, the radially projecting portion 56 can reliably prevent the lubricant reservoir portion 55 from being crushed. can be prevented from flowing out from between the ball portion 24 and the ball portion 24.

Further, the sliding surface 47 of the seat body 40 is provided with a plurality of first grooves 62 communicating only with the lubricant reservoir 55 and a plurality of second grooves 63 communicating only with the opening 41. Since the first groove portion 62 and the second groove portion 63 are alternately arranged in the circumferential direction of the sliding surface 47, the lubricant in the lubricant reservoir portion 55 can be supplied to the entire sliding surface 47, and the lubricant reservoir It is possible to prevent the lubricant in the portion 55 from directly flowing out to the opening 41 .

In addition, the end of the first groove 62 facing the opening 41 and the end of the second groove 63 facing the bottom 43 are arranged to overlap each other in the circumferential direction of the sliding surface 47. Therefore, the lubricant can be easily moved from the first groove portion 62 to the second groove portion 63 as the ball portion 24 rotates in the circumferential direction, and the lubricant can be supplied to the entire sliding surface 47 .

Further, since the axial length of the first groove portion 62 communicating with the lubricant reservoir portion 55 is shorter than the axial length of the second groove portion 63 communicating with the opening portion 41, the first The amount of lubricant supplied from the groove portion 62 to the second groove portion 63 can be maintained at an appropriate amount, and the outflow of the lubricant from the opening portion 41 can be prevented.

The ball joint 10 having such a bearing seat 16 can ensure the slidability and durability of the ball portion 24 .

Incidentally, the radial protrusion 56 of the bearing seat 16 may be formed continuously with the sliding surface 47, so that the crushing of the lubricant reservoir 55 can be prevented more reliably.

The ball joint 10 can be used not only for vehicles but also for any other applications.

INDUSTRIAL APPLICABILITY The present invention can be suitably used as a stabilizer link for a stabilizer device of a vehicle such as an automobile.

10 ball joint
16 Bearing seat
17 Ball stud as ball side member
18 Housing as a receiving member
24 ball part
40 seat body
41 opening
43 Bottom
47 Sliding surface
55 Lubricant reservoir
56 Projection
62 First groove
63 Second groove

Claims (4)

A bearing seat of a ball joint disposed between a ball portion of a ball-side member and a receiving-side member that receives the ball portion and rotatably holding the ball portion via a lubricant,
A sliding surface formed in a cylindrical shape having an opening through which the ball portion is inserted and a bottom portion on the opposite side of the opening portion, and slidably contacting the ball portion on the opening side rather than the bottom portion. a seat body having
a lubricant reservoir provided at the bottom of the seat body recessed from the sliding surface;
At the bottom of the seat body, the lubricating agent accumulating portion radially protrudes from the center of the lubricating agent accumulating portion toward the opening portion , and gradually tapers toward the center of the lubricating accumulating portion. A bearing seat for a ball joint, comprising: a protruding portion provided in a coupling shape and slidably contacting the ball portion. A bearing seat of a ball joint disposed between a ball portion of a ball-side member and a receiving-side member that receives the ball portion and rotatably holding the ball portion via a lubricant,
A sliding surface formed in a cylindrical shape having an opening through which the ball portion is inserted and having a bottom portion on the opposite side of the opening portion, and slidably contacting the ball portion on the opening side rather than the bottom portion. a seat body having
a lubricant reservoir provided at the bottom of the seat body recessed from the sliding surface;
a protruding portion radially protruding from the center of the lubricant reservoir toward the opening at the bottom portion of the seat body and slidably contacting the ball portion;
The lubricant reservoir is provided on the sliding surface of the seat body in a shape recessed from the sliding surface without notching up to the outer surface side of the seat body and extending from the bottom side toward the opening side. a plurality of first grooves communicating only with the lubricant reservoir in the opening;
The lubricant reservoir is provided on the sliding surface of the seat body in a shape recessed from the sliding surface without notching up to the outer surface side of the seat body and extending from the opening side toward the bottom side. and a plurality of second grooves communicating only with the opening of the openings,
A bearing seat for a ball joint, wherein the first grooves and the second grooves are alternately arranged in the circumferential direction of the sliding surface. The end side of the first groove directed toward the opening side and the end side of the second groove directed toward the bottom side are arranged at positions overlapping each other in the circumferential direction of the sliding surface. The bearing seat for a ball joint according to claim 2, characterized by: a ball-side member having a ball portion;
a receiving side member that receives the ball portion;
The bearing seat according to any one of claims 1 to 3, which is arranged between the ball portion and the receiving side member and rotatably holds the ball portion via a lubricant. ball joint.

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