JP7012345B2 - Ball joint and its manufacturing method - Google Patents

Description

The present invention relates to a ball joint provided with a receiving side member made of synthetic resin and a method for manufacturing the same.

In recent years, for example, vehicles such as automobiles are required to be lighter in weight, and parts are being made of resin. For example, in a ball joint that is a connection component to a component such as a knuckle or a chassis constituting a vehicle body, it is difficult to resinify a ball stud due to a problem of strength, and therefore resinification of a housing is being considered.

However, when the housing of the ball joint or the link obtained by integrally molding the housing is composed only of synthetic resin, the static strength and fatigue strength (dynamic strength) are insufficient depending on the vehicle having a high input load (load) such as impact. It may be used, and its use is limited and has not been generalized.

Therefore, it is known that the link is made of a high-strength material such as metal, and the housing formed at the end thereof is made of synthetic resin (see, for example, Patent Documents 1 and 2).

Japanese Patent No. 5923154 (pages 5-12, FIG. 3) JP-A-2017-141906 (pages 8-16, FIG. 1)

However, in the case of the above-mentioned ball joint, although the strength of the link can be secured, the strength around the housing, that is, the ball part and the bearing sheet is the same as the conventional case in which the link is entirely made of synthetic resin, and the performance, particularly There is concern that important performance such as the durability of ball studs will be insufficient.

The present invention has been made in view of such a point, and an object of the present invention is to provide a ball joint capable of reducing weight while ensuring performance and a method for manufacturing the same.

The ball joint according to claim 1 is a metal connecting member formed in a long length and having a hole portion along a direction intersecting the longitudinal direction on the end side, and a cylinder arranged in the hole portion of the connecting member. A ball side having a shaped seat member, a ball portion rotatably held by the seat member, and a stud portion protruding outward from the ball portion and connected to the connected portion. A member and a resin receiving side member formed by integrally covering the end side of the sheet member and the connecting member are provided, and the sheet member has a melting point higher than the molding temperature of the receiving side member. It is formed of a high resin, and the hole portion is formed to have a portion having a portion having an opening area smaller than that of an opening edge on the side opposite to the stud portion side at least .

The ball joint according to claim 2 is a metal connecting member formed in a long length and having a hole portion along a direction intersecting the longitudinal direction on the end side, and a cylinder arranged in the hole portion of the connecting member. A ball side having a shaped seat member, a ball portion rotatably held by the seat member, and a stud portion protruding outward from the ball portion and connected to the connected portion. A member and a resin receiving side member formed by integrally covering the end side of the sheet member and the connecting member are provided, and the sheet member has a melting point higher than the molding temperature of the receiving side member. The connecting member is formed of a high resin, and the edge portion of the hole portion on the stud portion side is equal to or protrudes toward the stud portion at an adjacent position of the seat member, and the receiving side member is the portion of the hole portion. It covers the edge on the stud side.

The ball joint according to claim 3 is formed in a long shape and has a metal connecting member having a hole along a direction intersecting the longitudinal direction on the end side, and at least a part of the hole in the connecting member. A tubular seat member arranged in contact with each other in the radial direction, a ball portion rotatably held by the seat member, and a connected portion protruding outward from the ball portion to the connected portion. A ball-side member having a stud portion to be connected and a resin receiving-side member formed by integrally covering the seat member and the end portion side of the connecting member are provided , and the hole portion is at least. It is formed to have a portion having an opening area smaller than that of the opening edge on the side opposite to the stud portion side .

The ball joint according to claim 4 is formed in a long shape and has a metal connecting member having a hole along a direction intersecting the longitudinal direction on the end side, and at least a part of the hole in the connecting member. A tubular seat member arranged in contact with each other in the radial direction, a ball portion rotatably held by the seat member, and a connected portion protruding outward from the ball portion to the connected portion. A ball-side member having a stud portion to be connected and a resin receiving-side member formed by integrally covering the seat member and the end side of the connecting member are provided, and the connecting member is the connecting member. The edge portion of the hole portion on the stud portion side is equivalent to or protrudes toward the stud portion at the position adjacent to the seat member, and the receiving side member covers the edge portion of the hole portion on the stud portion side. be.

The ball joint according to claim 5 is the ball joint according to claim 3 , wherein the seat member is made of a resin having a melting point higher than the molding temperature of the receiving side member.

The method for manufacturing a ball joint according to claim 6 includes a metal connecting member which is formed long and has a hole along a direction intersecting the longitudinal direction on the end side, a tubular seat member, and the like. A ball-side member having a ball portion and a stud portion protruding from the ball portion, and a resin receiving-side member are provided , and the hole portion is at least more than the opening edge on the side opposite to the stud portion side. A method for manufacturing a ball joint formed by having a portion having a small opening area, the sheet made of resin having a melting point higher than the molding temperature of the receiving side member, which holds the ball portion rotatably. The member is arranged in the hole portion of the connecting member, and the sheet member and the end portion side of the connecting member are integrally covered to injection-mold the receiving side member.

The method for manufacturing a ball joint according to claim 7 is a metal connecting member which is formed long and has a hole along a direction intersecting the longitudinal direction on the end side, a tubular sheet member, and a ball. A ball-side member having a portion and a stud portion protruding from the ball portion, and a resin receiving-side member are provided, and the edge portion of the hole portion of the connecting member on the stud portion side is the seat member. The sheet made of resin having a melting point higher than the molding temperature of the receiving side member, which is equivalent to the position adjacent to the above or is a method of manufacturing a ball joint protruding toward the stud portion, and which holds the ball portion rotatably. The member is placed in the hole portion of the connecting member, and the sheet member and the end portion side of the connecting member integrally cover the edge portion of the hole portion on the stud portion side to inject-mold the receiving side member. It is something to do.

The method for manufacturing a ball joint according to claim 8 is a metal connecting member which is formed long and has a hole along a direction intersecting the longitudinal direction on the end side, a tubular seat member, and a ball. A ball-side member having a portion and a stud portion protruding from the ball portion, and a resin receiving-side member are provided , and the hole portion is opened at least from the opening edge on the side opposite to the stud portion side. A method for manufacturing a ball joint formed by having a portion having a small area, in which at least a part of the sheet member that rotatably holds the ball portion is in contact with the hole portion of the connecting member in the radial direction. The sheet member and the end side of the connecting member are integrally covered and the receiving side member is injection-molded.

The method for manufacturing a ball joint according to claim 9 is a metal connecting member which is formed long and has a hole along a direction intersecting the longitudinal direction on the end side, a tubular seat member, and a ball. A ball-side member having a portion and a stud portion protruding from the ball portion, and a resin receiving-side member are provided, and the edge portion of the hole portion of the connecting member on the stud portion side is the seat member. It is a method of manufacturing a ball joint that is equivalent to or protrudes toward the stud portion at an adjacent position of the above, and at least a part of the sheet member that rotatably holds the ball portion is radially inserted into the hole portion of the connecting member. The seat member and the connecting member are placed in contact with each other to integrally cover the end side of the sheet member and the connecting member, and the receiving side member is injection-molded.

According to the ball joint according to claim 1, a sheet member formed of a resin having a melting point higher than the molding temperature of the receiving side member in a hole provided on the end side of the connecting member, and the ball portion are rotated by this sheet member. Since the ball-side member movably held is arranged and the resin receiving-side member is integrally covered with the sheet member and the end side of the connecting member, the heat for forming the receiving-side member is formed. Deformation due to softening of the seat member and deformation at the time of load input due to Since it is formed to have a portion having an opening area smaller than that of the opening edge of the ball, it is possible to increase the resistance of the seat member and the ball side member with respect to the pulling direction of the ball side member, and the weight is reduced while ensuring the performance. It will be possible.

According to the ball joint according to claim 2, a sheet member formed of a resin having a melting point higher than the molding temperature of the receiving side member in the hole provided on the end side of the connecting member and the ball portion are rotated by the sheet member. A movably held ball-side member is arranged, and the edge of the hole of the connecting member on the stud portion side is equal to or protrudes toward the stud portion from the adjacent position of the seat member, and these seat members and Since the resin receiving side member is molded by integrally covering the edge of the hole on the stud side on the end side of the connecting member, the sheet member caused by heat when molding the receiving side member. Deformation due to softening and deformation at the time of load input can be suppressed, and the receiving side member can hold the edge of the hole on the stud portion side and firmly hold the seat member and the ball side member by the receiving side member, ensuring performance. However, it becomes possible to reduce the weight.

According to the ball joint according to claim 3 , at least a part of the seat member is arranged in contact with the hole provided on the end side of the connecting member in the radial direction, and the ball portion is rotated by the seat member. Since the ball-side member that can be held is arranged and the receiving-side member made of resin is integrally covered with the end side of these seat members and the connecting member, the seat member and the ball-side member are received-side members. Since the hole is formed to have a portion having an opening area smaller than the opening edge on the side opposite to the stud portion side at least, the seat member or the ball with respect to the pulling direction of the ball side member can be firmly held. The drag force of the side member can be increased, and the weight can be reduced while ensuring the performance.

According to the fourth aspect of the present invention, at least a part of the seat member is arranged in the hole provided on the end side of the connecting member in contact with each other in the radial direction, and the ball portion is rotated by the seat member. A ball-side member that can be held is arranged, and the edge portion of the hole portion of the connecting member on the stud portion side is equal to or protrudes toward the stud portion from the seat member adjacent to the seat member, and these seat members and the connecting portion are connected. Since the resin receiving side member is molded by integrally covering the stud side edge of the hole on the end side of the member, the receiving side member holds the stud side edge of the hole. The seat member and the ball-side member can be firmly held by the receiving-side member, and the weight can be reduced while ensuring the performance.

According to the ball joint according to claim 5 , in addition to the effect of the ball joint according to claim 3 or 4 , when the seat member is deformed due to softening due to heat when molding the receiving side member or when a load is input. Deformation can be suppressed.

According to the method for manufacturing a ball joint according to claim 6, the sheet member that holds the ball portion rotatably is formed of a resin having a melting point higher than the molding temperature of the receiving side member and is formed on the end side of the connecting member. It is arranged in a hole formed by having a portion having an opening area smaller than the opening edge on the side opposite to the stud portion side at least , and integrally covers the end side of the seat member and the connecting member to cover the receiving side member with resin. By injection molding with It is possible to increase the drag force of the side member, and it is possible to easily manufacture a ball joint that can be made lighter while ensuring the performance.

According to the method for manufacturing a ball joint according to claim 7, the sheet member that holds the ball portion rotatably is formed of a resin having a melting point higher than the molding temperature of the receiving side member and placed in the hole portion of the connecting member. , The receiving side member is integrally covered at the end side of the seat member and the connecting member, which is equivalent to the adjacent position of the seat member or the edge portion of the hole portion protruding toward the stud portion side from the seat member. By injection molding with resin, it is possible to suppress deformation due to softening of the sheet member due to heat when injection molding the receiving side member and deformation at the time of load input, and the receiving side member is on the stud portion side of the hole. It is possible to easily manufacture a ball joint that can be made lighter while holding the edge portion of the resin and firmly holding the seat member and the ball-side member by the receiving-side member to ensure the performance.

According to the method for manufacturing a ball joint according to claim 8 , the seat member that holds the ball portion rotatably has an opening area on the end side of the connecting member at least on the side opposite to the stud portion side. By arranging at least a part of the hole formed by having a small part in contact with each other in the radial direction, the end side of the sheet member and the connecting member is integrally covered, and the receiving side member is injection-molded with resin. It is possible to increase the resistance of the seat member and the ball-side member with respect to the pulling-out direction of the ball-side member, and it is possible to easily manufacture a ball joint that can be made lighter while ensuring the performance.

According to the method for manufacturing a ball joint according to claim 9, a seat member that rotatably holds the ball portion is arranged in contact with at least a part in the hole portion of the connecting member in the radial direction, and the seat member and the connecting member are arranged. The receiving side member is injection-molded with resin by integrally covering the edge of the hole on the stud portion side of the hole that is equal to or adjacent to the seat member on the end side of the seat member or that protrudes toward the stud portion from the seat member. Therefore, it is easy to manufacture a ball joint that can be made lighter while holding the edge of the hole on the stud portion side by the receiving side member and firmly holding the seat member and the ball side member by the receiving side member to ensure the performance. can.

It is sectional drawing which shows the ball joint of 1st Embodiment of this invention. It is sectional drawing which shows the connecting member of the said-mentioned ball joint. It is sectional drawing which shows typically the manufacturing method of the ball joint in the order of (a) to (d). It is sectional drawing which shows the connecting member of the ball joint of the 2nd Embodiment of this invention. It is sectional drawing which enlarges and shows the vicinity of the hole part of the connecting member of the ball joint of the 3rd Embodiment of this invention. It is sectional drawing which enlarges and shows the vicinity of the hole part of the connecting member of the ball joint of 4th Embodiment of this invention. It is sectional drawing which enlarges and shows the vicinity of the hole part of the connecting member of the ball joint of the 5th Embodiment of this invention. It is sectional drawing which enlarges and shows the vicinity of the hole part of the connecting member of the ball joint of the 6th Embodiment of this invention. It is sectional drawing which enlarges and shows the vicinity of the hole part of the connecting member of the ball joint of 7th Embodiment of this invention.

Hereinafter, the configuration of the first embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 10 is a ball joint. The ball joint 10 forms a part of a stabilizer link (stabilizer link) used in a stabilizer device of a vehicle such as an automobile. The stabilizer device is a part of the suspension device used for, for example, the left and right wheels, and suppresses the roll of the vehicle when turning, such as during cornering. The roll means the rotation of the vehicle around an axis along the traveling front-rear direction 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. Further, the ball joint 10 includes a ball seat 16 as a seat member (bearing seat). Further, the ball joint 10 includes a ball stud 17 as a ball side member. Further, the ball joint 10 includes a housing 18 as a receiving side member. Further, although not shown, the ball joint 10 includes a dust cover as a closing member. Hereinafter, the vertical direction shall mean the vertical direction in each figure. Further, the longitudinal direction (that is, the vertical direction in FIGS. 1 and 2) of the ball stud 17 in the upright state (neutral state) is referred to as an axial direction, and the direction orthogonal to this axial direction is referred to as an axial vertical direction. do. Therefore, it is assumed that the central axis of the ball joint 10 coincides with (including substantially the same) the central axis of the ball stud 17 in the upright state (neutral state).

The link portion 15 shown in FIGS. 1 and 2 is formed in a long length by, for example, metal. In the present embodiment, the link portion 15 is formed of a solid material S such as a bar or a square material. The link portion 15 has a hole portion 21 on one end side. Further, in the link portion 15, the peripheral edge portion of the hole portion 21 is equivalent to the end portion of the ball sheet 16 adjacent to the peripheral edge portion, that is, substantially flush with each other (including flush with each other), or slightly with respect to the ball sheet 16. It is a thick part 22 that protrudes from the top. Although not shown, 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.

The hole portion 21 has a circular shape and is formed along a vertical direction that intersects (orthogonally) the longitudinal direction of the link portion 15. Further, the hole portion 21 is formed to have a portion having an opening area smaller than that of the lower opening edge.

The thick portion 22 is formed on the peripheral edge of the upper and lower opening edges of the hole portion 21. The thick portion 22 projects so as to gradually rise toward the hole portion 21, for example.

The ball sheet 16 is formed in a tubular shape (cylindrical shape), for example, made of a synthetic resin having excellent wear resistance. For example, the ball sheet 16 is made of a synthetic resin having a melting point higher than the molding temperature (injection temperature) of the housing 18. In the present embodiment, the ball sheet 16 is formed in a bottomed cylindrical shape. The ball sheet 16 is arranged in the hole 21 of the link portion 15 and is covered by the housing 18. That is, the ball sheet 16 is formed so as to have an axial direction along the vertical direction. The ball sheet 16 has an opening 25 at least on the upper end side. Further, the inner peripheral surface of the ball sheet 16 is a cylindrical sliding contact surface 26 continuous with the opening 25. Further, the upper and lower ends of the outer edge portion of the ball sheet 16 are adjacent to the thick portion 22 of the link portion 15. The outer peripheral surface of the ball sheet 16 may be in contact with the inner peripheral surface of the hole 21. Further, the outer peripheral side of the ball sheet 16 may be provided with a convex portion that comes into contact with the inner peripheral surface of the hole portion 21.

The ball stud 17 is made of, for example, steel, 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 16 via a lubricant (grease). That is, the ball portion 28 is housed inside the hole portion 21 together with the ball sheet 16. In the present embodiment, the central portion of the ball portion 28 substantially coincides with the central portion in the vertical direction, which is the thickness direction (direction orthogonal to the longitudinal direction) of the link portion 15. In other words, the central portion of the ball portion 28 is located on the center line in the thickness direction of the link portion 15.

The stud portion 29 is a portion connected to the suspension arm or the stabilizer bar to which a load is applied, and protrudes outward (upper in FIG. 1) from the link portion 15 and the housing 18. The stud portion 29 is exposed from the opening 25 to the outside of the ball sheet 16 and extends upward with respect to the hole portion 21. A male screw portion 31 as a connecting portion is formed on the tip end side of the stud portion 29, that is, on the side opposite to the ball portion 28. Further, in the present embodiment, the stud portion 29 is formed with, for example, a flange portion 32 as a connection stabilizing portion.

The male screw portion 31 is inserted into, for example, a suspension arm or an insertion hole (not shown) formed on the stabilizer bar side, and a nut or the like is screwed into the ball stud 17 (stud portion 29) to form a suspension arm or stabilizer. This is the part that connects to the bar side.

The flange portion 32 is projected from the stud portion 29 in a flange shape. The flange portion 32 is in surface contact with the suspension arm or the stabilizer bar side to secure a contact area between the ball joint 10 side and the suspension arm or the stabilizer bar side, and stabilize the connection state by the male screw portion 31. It is a thing.

The housing 18 is also called a socket or the like, and is injection-molded with, for example, a synthetic resin. The housing 18 is formed so as to integrally cover the end side of the link portion 15 together with the ball sheet 16. That is, the housing 18 holds the ball sheet 16 including the ball portion 28 inside together with the end portion side of the link portion 15. The housing 18 includes a link portion covering portion 35 as a connecting member covering portion that covers the end portion side of the link portion 15, and a ball as a sheet member covering portion that covers and holds the ball sheet 16 including the hole portion 21. It is integrally provided with the sheet covering portion 36. Further, the housing 18 is provided with a housing opening 37 which is a receiving side member opening from which the stud portion 29 of the ball stud 17 projects. Further, the housing 18 is provided with a cover mounting portion 38 at the top for mounting the dust cover.

The link portion covering portion 35 is formed so as to cover a portion extending from the upper and lower surfaces of the link portion 15 to the side surface with a substantially constant thickness, for example.

The ball sheet covering portion 36 continuously covers the link portion covering portion 35, beyond the thick portion 22 on the upper side of the link portion 15, and extending to the upper portion of the upper end portion of the ball sheet 16. That is, the ball sheet covering portion 36 includes a pressing portion 41 that wraps the upper portion of the thick portion 22 on the upper side of the link portion 15 and presses the outer edge portion of the ball sheet 16 from above. Further, the ball sheet covering portion 36 continuously extends from the link portion covering portion 35 to the thick portion 22 on the lower side of the link portion 15 and covers the bottom of the ball sheet 16. That is, the ball sheet covering portion 36 includes a holding portion 42 that holds the bottom portion of the ball sheet 16.

The housing opening 37 is formed so as to communicate with the opening 25 of the ball sheet 16 and is gradually widened upward.

The cover mounting portion 38 is continuously projected upward from the upper portion of the holding portion 41 of the ball sheet covering portion 36. The cover mounting portion 38 projects upward from the link portion covering portion 35 and is raised on the peripheral edge of the housing opening 37. The cover mounting portion 38 is formed in a continuous groove shape over the entire circumference.

The dust cover, also called a dust seal or boot, covers the housing opening 37 of the housing 18 regardless of the swing of the ball stud 17 and prevents moisture and dust from entering the inside of the housing 18 or the ball sheet 16. It is something to do. This dust cover is formed in a substantially cylindrical shape by, 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 (the position below the flange portion 32), and the upper end side is the cover mounting portion of the housing 18. It is fitted to 38 and tightened and fixed by a ring-shaped fixing member (not shown) attached to the outer peripheral surface on the upper end side.

Next, the manufacturing method of the first embodiment will be described with reference to FIG.

First, a solid material or the like is processed to form a link portion 15 having a hole portion 21 in advance (FIG. 3 (a)).

Further, the ball sheet 16 and the ball portion 28 are arranged in the hole portion 21 of the link portion 15 in a state where the ball portion 28 of the ball stud 17 is rotatably held on the sliding contact surface 26 of the separately molded ball sheet 16. The first intermediate M1 is formed (FIG. 3 (b)). The stud portion 29 of the ball stud 17 may be integrally formed with the ball portion 28 in advance, or may be connected to the ball portion 28 by welding or the like in a later process.

Then, the first intermediate M1 is set in the cavity C of the molding die (mold) D (FIG. 3 (c)), and is arranged on the end side including the hole 21 of the link portion 15 and in the hole 21. A synthetic resin is injected into the cavity C so as to cover the ball sheet 16 to form the housing 18 (FIG. 3 (d)). As a result, the ball sheet 16 that rotatably holds the ball portion 28 of the ball stud 17 forms the second intermediate M2 that is housed and held inside the housing 18.

After that, the ball joint 10 (stabilizer link) is manufactured by performing a predetermined finishing process such as opening the molding die D, removing the second intermediate M2 from the molding die D, and fitting a dust cover.

As described above, according to the first embodiment, the ball sheet 16 and the ball sheet 16 rotatably hold the ball portion 28 in the hole portion 21 provided on the end side of the link portion 15. Since the ball stud 17 is arranged and the resin housing 18 is molded by integrally covering the end side of the ball sheet 16 and the link portion 15, for example, the ball sheet 16 and the ball stud are formed only by the synthetic resin housing. The ball sheet 16 and the ball stud 17 can be held more firmly by the housing 18 as compared with the case where the 17 is held, and the weight can be reduced while ensuring the performance, particularly the durability of the ball stud 17.

Further, the stud portion 29 side of the hole portion 21 of the link portion 15, that is, the upper edge portion (thick portion 22) is equal to or protrudes toward the stud portion 29 with respect to the adjacent position (upper end portion of the outer edge portion) of the ball sheet 16. By covering this edge portion (thick wall portion 22) with the housing 18, the housing 18 holds the upper edge portion (thick wall portion 22) on the stud portion 29 side of the hole portion 21, and the ball sheet 16 and the ball. The stud 17 can be firmly held by the housing 18, and the seat deformation at the time of load input can be suppressed.

By forming the ball sheet 16 with a resin having a melting point higher than the molding temperature of the housing 18, it is possible to suppress the deformation of the ball sheet 16 due to the heat generated when the housing 18 is molded.

Further, when the inner peripheral surface of the hole 21 and the outer peripheral surface (convex portion) of the ball sheet 16 are brought into contact with each other, the composition is performed in a state where the minute gap between the hole 21 and the ball sheet 16 is surely eliminated. Since the housing 18 can be molded so as to be wrapped with the resin, the characteristics and durability of the ball joint 11 can be improved.

When manufacturing the ball joint 10, the ball sheet 16 that rotatably holds the ball portion 28 is arranged in the hole portion 21 of the link portion 15, and the ball sheet 16 and the end portion side of the link portion 15 are integrated. By injection-molding the housing 18 by covering it with a target, the ball joint 10 that can be made lighter can be easily manufactured while the ball sheet 16 and the ball stud 17 are firmly held by the housing 18 to ensure the performance.

In the first embodiment, as in the second embodiment shown in FIG. 4, the link portion 15 may be formed as a hole portion 21 by arranging a hole in the plate-shaped material P. Further, the link portion 15 may be formed into a plate shape by plastically deforming the end portion of the hollow material (pipe material or the like).

Further, the link portion 15 can be a separate body from the end portion including the hole portion 21 and other portions.

With these configurations, the link unit 15 can be selected according to the usage situation (application) and the required performance, and the degree of freedom in design can be improved.

Further, in each of the above embodiments, the hole portion 21 may be formed to have a portion having an opening area smaller than that of the lower opening edge which is at least the side opposite to the stud portion 29 side. For example, as in the third embodiment shown in FIG. 5, the hole portion 21 has a reduced diameter surface 21a whose diameter is gradually reduced upward (the opening area is narrowed) from the lower opening edge. The upper end portion of the reduced diameter surface 21a may have a non-reduced diameter surface 21b that is continuous and has a substantially constant diameter dimension (the opening area is substantially constant). The reduced diameter surface 21a is formed, for example, in a conical surface shape (tapered shape), and may be formed from the lower portion (lower opening edge) in the vertical direction of the hole portion 21 to the central portion. In this case, the drag of the ball sheet 16 and the ball stud 17 with respect to the pulling direction of the ball stud 17 (upward on the stud portion 29 side) can be increased, and the durability of the ball stud 17 can be ensured.

Similarly, for example, as in the fourth embodiment shown in FIG. 6, a hole is formed in the enlarged diameter surface 21c which is continuous with the upper end portion of the reduced diameter surface 21a and gradually increases in diameter upward (the opening area becomes larger). The configuration may be such that the opening edge on the upper side of the portion 21 is continuously provided, or the non-diameter surface 21b is continuous on the upper end portion of the reduced diameter surface 21a as in the fifth embodiment shown in FIG. The enlarged diameter surface 21c may be continuous with the upper end portion of the non-reduced diameter surface 21b, or as in the sixth embodiment shown in FIG. 8, the lower opening edge to the upper opening edge of the hole portion 21. It may be configured to continuously and gradually reduce the diameter. Further, as in the seventh embodiment shown in FIG. 9, by forming the stepped portion 21d projecting in a stepped shape inside the hole portion 21, the opening area is larger than that of the lower opening edge of the hole portion 21. It may be configured to have a small portion. In addition, in these FIGS. 5 to 9, in order to clarify the explanation, the reduced diameter surface 21a, the enlarged diameter surface 21c, and the stepped portion 21d are exaggerated.

Then, in each of the above-described embodiments, the ball joint 10 can be used not only for vehicles but also for any other purpose.

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

10 ball joint
15 Link part as a connecting member
16 Ball seat as a seat member
17 Ball stud as a ball side member
18 Housing as a receiving side member
21 hole
28 Ball part
29 Stud part

Claims (9)

A metal connecting member that is formed long and has a hole on the end side along the direction intersecting the longitudinal direction.
A cylindrical sheet member arranged in the hole of this connecting member and
A ball portion rotatably held by the seat member, and a ball-side member having a stud portion that protrudes outward from the ball portion and is connected to the connected portion.
A resin receiving side member formed by integrally covering the end side of the sheet member and the connecting member is provided.
The sheet member is formed of a resin having a melting point higher than the molding temperature of the receiving side member .
The hole portion is formed to have a portion having an opening area smaller than that of the opening edge on the side opposite to the stud portion side at least.
A ball joint that features that. A metal connecting member that is formed in a long length and has a hole on the end side along a direction that intersects the longitudinal direction.
A cylindrical sheet member arranged in the hole of this connecting member and
A ball portion rotatably held by the seat member, and a ball-side member having a stud portion that protrudes outward from the ball portion and is connected to the connected portion.
A resin receiving side member formed by integrally covering the end side of the sheet member and the connecting member is provided.
The sheet member is formed of a resin having a melting point higher than the molding temperature of the receiving side member.
In the connecting member, the edge portion of the hole portion on the stud portion side is equivalent to the position adjacent to the seat member or protrudes toward the stud portion.
The receiving side member covers the edge portion of the hole portion on the stud portion side.
A ball joint that features that. A metal connecting member that is formed long and has a hole on the end side along the direction intersecting the longitudinal direction.
A cylindrical sheet member arranged so that at least a part of the hole of the connecting member is in contact with each other in the radial direction.
A ball portion rotatably held by the seat member, and a ball-side member having a stud portion that protrudes outward from the ball portion and is connected to the connected portion.
A resin receiving side member formed by integrally covering the end side of the sheet member and the connecting member is provided .
The hole portion is formed to have a portion having an opening area smaller than that of the opening edge on the side opposite to the stud portion side at least.
A ball joint that features that. A metal connecting member that is formed in a long length and has a hole on the end side along a direction that intersects the longitudinal direction.
A cylindrical sheet member arranged so that at least a part of the hole of the connecting member is in contact with each other in the radial direction.
A ball portion rotatably held by the seat member, and a ball-side member having a stud portion that protrudes outward from the ball portion and is connected to the connected portion.
A resin receiving side member formed by integrally covering the end side of the sheet member and the connecting member is provided.
In the connecting member, the edge portion of the hole portion on the stud portion side is equivalent to the position adjacent to the seat member or protrudes toward the stud portion.
The receiving side member covers the edge portion of the hole portion on the stud portion side.
A ball joint that features that. The ball joint according to claim 3 or 4 , wherein the seat member is made of a resin having a melting point higher than the molding temperature of the receiving side member . A metal connecting member formed long and having a hole along the direction intersecting the longitudinal direction on the end side, a tubular seat member, a ball portion, and a stud portion protruding from the ball portion. A ball-side member and a resin-made receiving-side member are provided , and the hole portion is formed to have a portion having an opening area smaller than that of an opening edge on the side opposite to the stud portion side at least. It ’s a method of manufacturing ball joints.
The sheet member made of resin having a melting point higher than the molding temperature of the receiving side member, which holds the ball portion rotatably, is arranged in the hole portion of the connecting member.
A method for manufacturing a ball joint, which comprises integrally covering the end side of the sheet member and the connecting member and injection molding the receiving side member. A metal connecting member formed long and having a hole along the direction intersecting the longitudinal direction on the end side, a tubular seat member, a ball portion, and a stud portion protruding from the ball portion. A ball-side member and a resin-made receiving-side member are provided, and the edge portion of the hole portion of the connecting member on the stud portion side is equal to or protrudes toward the stud portion at an adjacent position of the seat member. It is a method of manufacturing a ball joint
The sheet member made of resin having a melting point higher than the molding temperature of the receiving side member, which holds the ball portion rotatably, is arranged in the hole portion of the connecting member.
The receiving side member is injection-molded by integrally covering the edge portion of the hole portion on the stud portion side at the end side of the sheet member and the connecting member.
A method for manufacturing a ball joint, which is characterized by the fact that. A metal connecting member formed long and having a hole along the direction intersecting the longitudinal direction on the end side, a tubular seat member, a ball portion, and a stud portion protruding from the ball portion. A ball-side member and a resin-made receiving-side member are provided , and the hole portion is formed to have a portion having an opening area smaller than that of an opening edge on the side opposite to the stud portion side at least. It ’s a method of manufacturing ball joints.
The sheet member that rotatably holds the ball portion is arranged so that at least a part thereof is in contact with the hole portion of the connecting member in the radial direction.
A method for manufacturing a ball joint, which comprises integrally covering the end side of the sheet member and the connecting member and injection molding the receiving side member. A metal connecting member formed long and having a hole along the direction intersecting the longitudinal direction on the end side, a tubular seat member, a ball portion, and a stud portion protruding from the ball portion. A ball-side member and a resin-made receiving-side member are provided, and the edge portion of the hole portion of the connecting member on the stud portion side is equal to or protrudes toward the stud portion at an adjacent position of the seat member. It is a method of manufacturing a ball joint
The sheet member that rotatably holds the ball portion is arranged so that at least a part of the sheet member is in contact with the hole portion of the connecting member in the radial direction.
The receiving side member is injection-molded by integrally covering the end side of the sheet member and the connecting member.
A method for manufacturing a ball joint, which is characterized by the fact that.

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