Ball joint assembly for a vehicle, stabilizing element including the ball joint, and method for manufacturing a ball joint assembly for a vehicle

Abstract

A ball joint assembly (100, 100a, 100b) for a vehicle, comprising: a built-in part (110, 110') with an inner circumferential area (113) in which a hole (110h) is formed in an upward-downward direction; a ball stud (140) with a ball (141) and a stud (143) extending from the ball (141); a bearing (130) coupled in such a way that it surrounds the ball (141) and is arranged in the hole (110h); and an insert injection molded part (120) designed to fill a space formed between the inner circumferential region (113) and an outer surface (133) of the bearing (130) in the hole (110h), wherein the inner circumferential region (113) has at least one upper protruding region (113a) which protrudes in an upper region in a direction towards a central axis of the hole (110h), and at least one lower protruding region (113b) which protrudes in a lower region in the direction towards the central axis, characterized by the fact that, the at least one upper projecting area (113a) and the at least one lower projecting area (113b) which are adjacent to each other in a circumferential direction, are arranged so that they border each other in the circumferential direction or are arranged so that they are spaced apart from each other in the circumferential direction when viewed from above, and wherein the at least one upper projecting area (113a) and the at least one lower projecting area (113b) are arranged such that they do not overlap when viewed from above, and wherein the insert injection molded part (120) fills a gap between a protruding end of the at least one upper protruding area (113a) and the outer surface (133) of the bearing (130) and fills a gap between a protruding end of the at least one lower protruding area (113b) and the outer surface (133) of the bearing (130).

Description

[Technical area]

[0001] The present disclosure relates to a ball joint arrangement for a vehicle according to the preamble of claim 1, a method for manufacturing such a arrangement according to the preamble of claim 14 and to a stabilizing member according to the preamble of claim 10. [Background]

[0002] In general, a vehicle suspension device is a device for connecting a vehicle body to a wheel. The vehicle suspension device comprises a spring for absorbing vibrations or shocks transmitted from a road surface to the vehicle body, a shock absorber for controlling the spring action, and a suspension arm or link for controlling the wheel function. (From Korean patent application KR 10 2017 0 099 258 A) A stabilizing link for a vehicle is known. The known device comprises a rod with housing parts integrated at both ends, each housing part containing a ball joint assembly. Each housing part has a mounting hole into which a ball joint is inserted by means of an injection-molded insert component.

[0003] Currently, there are two main types of wheel steering: axle suspension and independent suspension. Independent suspension includes swingarm, wishbone, and MacPherson strut designs. Depending on the steering type, the suspension arm comprises a lower arm, upper arm, trailing arm, lateral arm, and other components. The suspension arm connects a steering knuckle, which is coupled to the wheel, to the vehicle body, allowing the knuckle to move up and down relative to the body. One end of the suspension arm is connected to the vehicle body in such a way that it rotates within a predetermined range around a pivot point that extends forward and backward. The other end of the suspension arm is connected to the steering knuckle via a ball joint.

[0004] Meanwhile, a stabilizer bar is attached to the suspension to suppress body roll (i.e., the vehicle leans to the left or right) and improve ride comfort. Both ends of the stabilizer bar are connected to the suspension arm or shock absorber, which moves up and down with the wheel. Generally, a central section of the stabilizer bar is fixed to the vehicle body. If a height difference occurs between the two wheels, the two end sections, which are shaped to extend from the central section of the stabilizer bar from front to back, will also experience a height difference. This causes the central section to twist. The stabilizer bar provides a restoring force against this twisting, thus preventing the creation of the height difference between the two wheels.

[0005] The end of the stabilizer bar is connected to the control arm or shock absorber via a stabilizer link. The stabilizer link consists of a rod made of a metallic material. One end of the rod is connected to the end of the stabilizer bar via a ball joint, and the other end is connected to the wheel suspension arm or shock absorber via a ball joint. The ball joint has a structure in which a bearing is coupled to a ball stud to surround a ball of the stud, allowing the stud to rotate relative to a mounting point to which the bearing is attached. [Revelation][Technical Problem]

[0006] A molding material used for overmolding inserts can shrink upon cooling after overmolding. This can lead to a gap between the metallic material and the molding material. Furthermore, the ingress of rainwater or similar substances into the gap can cause corrosion of the metallic material. This impairs the strength and durability of any connection between the metallic material and the molding material. Additionally, a gap can form between the metallic material and the molding material. Embodiments of the present disclosure provide a ball joint arrangement to solve these problems. [Technical solution]

[0007] A ball joint assembly for a vehicle according to the present disclosure comprises: an installation part with an inner circumferential region in which a hole is formed in an upward-downward direction; a ball stud comprising a ball and a pin extending from the ball; a bearing coupled such that it surrounds the ball and is arranged in the hole; and an injection-molded insert part configured to fill a space formed between the inner circumferential region and an outer surface of the bearing in the hole. The inner circumferential region comprises at least one upper protruding region projecting in an upper area in a direction toward a central axis of the hole, and at least one lower protruding region projecting in a lower area in the direction toward the central axis.

[0008] According to one embodiment of the present disclosure, the at least one upper protruding area and the at least one lower protruding area can be arranged alternately in a circumferential direction.

[0009] According to one embodiment of the present disclosure, the at least one upper projecting region can include a plurality of upper projecting regions, and the at least one lower projecting region can include a plurality of lower projecting regions. The plurality of upper projecting regions can be arranged such that they are spaced apart from one another along a circumferential direction, and the plurality of lower projecting regions can be arranged such that they are spaced apart from one another along the circumferential direction.

[0010] According to the present disclosure, the at least one upper projecting area and the at least one lower projecting area, which are adjacent to each other in a circumferential direction, are arranged such that they border each other in the circumferential direction or are arranged such that they are spaced apart from each other in the circumferential direction when viewed from above.

[0011] According to the present disclosure, the at least one upper protruding area and the at least one lower protruding area are arranged such that, viewed from above, they do not overlap each other.

[0012] According to the present disclosure, the insert injection molded part fills a gap between a protruding end of the at least one upper protruding region and the outer surface of the bearing and fills a gap between a protruding end of the at least one lower protruding region and the outer surface of the bearing.

[0013] According to one embodiment of the present disclosure, the insert injection molded part can cover an upper surface of the at least one upper protruding region and can cover a lower surface of the at least one lower protruding region.

[0014] According to one embodiment of the present disclosure, the insert injection-molded part can be formed by injection molding. The center point of the sphere can be positioned within the hole.

[0015] According to one embodiment of the present disclosure, the at least one upper protruding region can be arranged above the center of the sphere, and the at least one lower protruding region can be arranged below the center of the sphere.

[0016] According to one embodiment of the present disclosure, on a cross-section extending along the center of the ball in an upward / downward direction, the outer surface of the bearing can be shaped such that it protrudes furthest in a radially outward direction at a position that is lower than the at least one upper protruding region and higher than the at least one lower protruding region.

[0017] According to one embodiment of the present disclosure, the at least one upper projecting region may extend in a circumferential direction at an angle of 180 degrees or less, and the at least one lower projecting region may extend in the circumferential direction at an angle of 180 degrees or less.

[0018] A stabilizing member according to the present disclosure comprises: a first insert with a first inner circumferential region in which a first hole is formed in a first upward-downward direction along a first central axis; a first ball stud with a first ball and a first stud extending from the first ball; a first bearing coupled such that it surrounds the first ball and is arranged in the first hole; a first injection-molded insert configured to fill a space formed between the first inner circumferential region and an outer surface of the first bearing in the first hole; and a rod with an end to which the first insert is attached.The first inner circumferential region comprises at least a first upper protruding region projecting in a first upper region in a direction of the first central axis, and at least a first lower protruding region projecting in a first lower region in the direction of the first central axis.

[0019] According to one embodiment of the present disclosure, the at least one first upper protruding area and the at least one first lower protruding area can be arranged alternately in a circumferential direction.

[0020] According to one embodiment of the present disclosure, the stabilizing member comprises: a second insert having a second inner circumferential region in which a second hole is formed in a second upward-downward direction along a second central axis and which is provided for attachment to the other end of the rod; a second ball stud comprising a second ball and a second stud extending from the second ball; a second bearing coupled such that it surrounds the second ball and is arranged in the second hole; and a second injection-molded insert configured to fill a space formed between the second inner circumferential region and an outer surface of the second bearing in the second hole.The second inner circumferential region may include at least a second upper protruding region that protrudes in a second upper region in a direction towards the second central axis, and at least a second lower protruding region that protrudes in a second lower region in the direction towards the second central axis.

[0021] According to one embodiment of the present disclosure, the at least one second upper protruding area and the at least one second lower protruding area can be arranged alternately in the circumferential direction.

[0022] According to one embodiment of the present disclosure, the first and second central axes can be arranged parallel to each other.

[0023] A method for manufacturing a ball joint assembly for vehicles according to the present disclosure comprises the following: a die-casting step of manufacturing an insert by die casting, wherein the insert comprises a hole formed in an upward-downward direction, at least one upper protruding area projecting in the direction of a central axis of the hole in an upper region of the hole, and at least one lower protruding area projecting in the direction of the central axis of the hole in a lower region of the hole; a Positioning step of positioning a bearing to which a ball stud is connected in the hole, and of arranging an injection mold on the insert; and an injection molding step to form an insert injection molded part configured to support the bearing by applying an insert injection mold into the injection mold to fill a space formed between the insert and an outer surface of the bearing in the hole.

[0024] According to one embodiment of the present disclosure, the component can be produced in the die-casting step by injecting molten metal into a space formed by an upper die-casting mold and a lower die-casting mold, in a state in which the upper die-casting mold, defining an upper surface of the at least one upper protruding region and an upper surface of the at least one lower protruding region, and the lower die-casting mold, defining a lower surface of the at least one upper protruding region and a lower surface of the at least one lower protruding region, are engaged with each other.

[0025] According to one embodiment of the present disclosure, the die-casting step may include separating the upper die-casting mold and the lower die-casting mold from each other in an upward or downward direction after the injected molten metal has solidified.

[0026] According to one embodiment of the present disclosure, the at least one upper protruding area and the at least one lower protruding area can be formed alternately in the circumferential direction. [Beneficial effects]

[0027] According to the embodiments of the present disclosure, the insert part can support the injection-molded insert more stably and the injection-molded insert can support the bearing more stably.

[0028] Furthermore, it is possible to significantly reduce the gap formed between the inner circumference of the component and the injection-molded insert, thereby considerably increasing the strength and durability of the ball joint assembly. List of characters Fig. Figure 1 is a perspective view of a stabilizing element according to an embodiment of the present disclosure. Fig. Figure 2 is a perspective exploded view of a ball joint assembly made of Fig. 1, with the exception of one insert injection molded part. Fig. Figure 3 is a vertical cross-sectional view of the ball joint assembly, which runs along the line S1-S1' in Fig. 1 was recorded. Fig. Figure 4 is a vertical cross-sectional view of the ball joint assembly, which runs along the line S2-S2' in Fig. 1 was recorded. Fig. Figure 5 is a vertical cross-sectional view of a built-in component, extending along the line S1-S1' in Fig. 1 was recorded. Fig. 6 is a top view of the built-in component of Fig. 1, viewed from above. Fig. Figure 7 is a perspective view of a built-in component according to a further embodiment. Fig. Figure 8 is a flowchart of a manufacturing process for a ball joint arrangement according to an embodiment of the present disclosure. Fig. 9a and Fig. 9b are views showing how a component is formed using a die-casting mold in a die-casting step of Fig. 8 is manufactured. Fig. Figure 10 is a cross-sectional view showing how the insert injection-molded part is formed using an injection mold in a single injection molding step. Fig. 8 is manufactured. Fig. 11a to Fig. Figure 11e shows a radial gap (X-axis, unit: mm) between the insert injection molded part and the inner circumferential area with respect to the vertical position (Y-axis, unit: mm) of the inner circumferential area, assuming a ratio of radial shrinkage to radial thickness of the insert injection molded part of 0.3%. DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure are presented by way of example to illustrate the technological concept of the present disclosure. The scope of the claims according to the present disclosure is not limited to the embodiments described below or to detailed descriptions of these embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to whom this disclosure relates. All terms used herein have been chosen to describe this disclosure more clearly and not to limit the scope of this disclosure as defined by the attached claims.

[0031] Unless the sentence or wording clearly indicates otherwise, the terms “comprise”, “include”, “have” and the like used here are to be interpreted as open terms that include the possibility of including other embodiments.

[0032] The singular form described here can include the plural form, unless the context clearly specifies otherwise, and this also applies to the singular form set out in the claims.

[0033] The terms “first”, “second”, and the like are used to distinguish a plurality of components, and the order or meaning of the corresponding components is not restricted by these terms. Furthermore, unless otherwise defined in the present disclosure, a component following the term “first” is referred to as a component of a first ball joint assembly 100a, and a component following the term “second” is referred to as a component of a second ball joint assembly 100b.

[0034] Directional terms such as "upwards," "above," and the like, used in the description of a ball joint assembly 100 for a vehicle according to the present disclosure, signify directions in which a pin 143 projects in an extensional direction of a hole 110h of a mounting part 110 of the ball joint assembly 100. Directional terms such as "downwards," "below," and the like signify directions opposite to the above directions "upwards" and "above." The ball joint assembly 100 shown in the accompanying drawings can be arranged in directions other than those mentioned above, and the directional terms can be understood accordingly.

[0035] As in Fig. As shown in Figure 1, in a case where both the first ball joint assembly 100a and the second ball joint assembly 100b are shown, the upward-downward direction of the first ball joint assembly 100a can be referred to as a first upward-downward direction and the upward-downward direction of the second ball joint assembly 100b as a second upward-downward direction. Fig. In the first up-down direction and the second up-down direction, the first up-down direction and the second up-down direction are the same. However, depending on the arrangement of the ball joint assemblies 100a and 100b, the first up-down direction and the second up-down direction can differ from each other, e.g., different directions or directions perpendicular to each other.

[0036] The term “central axis X”, used in the description of the ball joint assembly for a vehicle 100 of the present disclosure, denotes an axis that passes through a hole 110h in the direction of extension of the hole 110h of the installation part 110. Here, the central axis X is a virtual axis for the purpose of describing the present disclosure and does not represent the actual part of the device. Furthermore, the term “radially outward direction XO”, as used in the description of the ball joint assembly 100 of the present disclosure, means a direction away from the central axis X of the ball joint assembly 100, and the term “radially inward direction XI” means a direction approaching the central axis X (direction toward the central axis X), and the term “circumferential direction XC” means a direction of rotation about the central axis X.

[0037] In a case where both the first ball joint assembly 100a and the second ball joint assembly 100b are as described in Fig. As shown in Figure 1, the central axis X of the first ball joint assembly 100a can be referred to as a first central axis Xa, and the central axis X of the second ball joint assembly 100b can be referred to as a second central axis Xb. A radially outward direction XOa, a radially inward direction Xla, and a circumferential direction XCa of the first ball joint assembly 100a are defined with respect to the first central axis Xa, and a radially outward direction XOb, a radially inward direction XIb, and a circumferential direction XCb of the second ball joint assembly 100b are defined with respect to the second central axis Xb. Although the first central axis Xa and the second central axis Xb are shown in Figure 1, they can be referred to as a second central axis Xb. Fig. 1 are shown as parallel to each other, the central axis Xa and the central axis Xb can be in a relationship other than parallel, for example in a vertical relationship, depending on the arrangement of the first and second ball joint arrangement 100a and 100b.

[0038] The embodiments are described below with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding components are assigned the same reference numbers. Furthermore, duplicate descriptions of the same or corresponding components may be omitted in the following descriptions of the embodiment examples. However, even if a description of a component is omitted, such a component should not be excluded from any embodiment.

[0039] The ball joint assembly 100 for a vehicle according to the present disclosure can be used as a ball joint connection structure between two links, for example, a connection structure between a suspension arm and a joint, a connection structure between a stabilizer bar and a stabilizer link 10, a connection structure between the stabilizer link 10 and the suspension arm or a shock absorber, or the like. Hereinafter, the ball joint assembly 100 according to the present embodiment is described as a structure for connecting the stabilizer link 10 to another external element (for example, the stabilizer bar, the suspension arm, or the shock absorber). However, the vehicle ball joint assembly 100 according to the present embodiment is not necessarily limited to this.

[0040] The stabilizer 10 and another external component can be connected to each other via the ball joint assembly 100. For example, the stabilizer 10 and the stabilizer rod can be connected to each other via the ball joint assembly 100. Furthermore, the stabilizer 10 and the shock absorber or the suspension arm can be connected to each other via the ball joint assembly 100. The suspension arm can be configured differently depending on the type of suspension device. The stabilizer 10 can be connected to a lower arm, an upper arm, or a trailing arm via the ball joint assembly 100.

[0041] The mounting part 110 of the ball joint assembly 100 according to the present embodiment is attached to a rod 11 of the stabilizing member 10, but is not necessarily limited to this. For example, the mounting part 110 can be attached to another component. Additionally, in the present embodiment, a pair of ball joint assemblies are arranged at both ends of the stabilizing member 10, but is not necessarily limited to this. In some embodiments, the ball joint assembly can be arranged in one of the two ends of the stabilizing member. In some embodiments, the ball joint assembly can be arranged in another component outside the stabilizing member, instead of being arranged on the stabilizing member.

[0042] With reference to Fig. 1 The stabilizing element 10 is now described according to an embodiment of the present disclosure. Fig. Figure 1 is a perspective view of the stabilizing element 10 according to an embodiment of the present disclosure.

[0043] The stabilizing member 10 comprises the rod 11, which extends from one end of the stabilizing member 10 to the other end. The stabilizing member 10 includes the first ball joint assembly 100a, which is arranged at one end of the rod 11. The stabilizing member 10 may further include the second ball joint assembly 100b, which is arranged at the other end of the rod 11. A first component 110 of the first ball joint assembly 100a can be attached to one end of the rod 11. A second component 110 of the second ball joint assembly 100b can be attached to the other end of the rod 11.

[0044] One end of the stabilizer link 10 is configured to connect to an external stabilizer bar, and the other end is configured to connect to an external suspension arm or shock absorber. One of the first ball joint assembly 100a and the second ball joint assembly 100b are configured to connect the stabilizer link 10 and the stabilizer bar, and the other is configured to connect the stabilizer link 10 and the suspension arm or shock absorber.

[0045] The first insert 110 forms a first hole 110h in the first upward-downward direction along the first central axis Xa. The second insert 110 forms a second hole 110h in the second upward-downward direction along the second central axis Xb.

[0046] The first central axis Xa and the second central axis Xb can be arranged parallel to each other. In this configuration, the rod 11, the first insert 110, and the second insert 110 can be integrally manufactured using only two die-casting molds, including an upper die-casting mold and a lower die-casting mold. This is practical and economical. If the first central axis Xa and the second central axis Xb are not parallel, the directions (the first up-down direction) in which a first upper die-casting mold and a first lower die-casting mold, defining the outer shape of the first insert 110, are separated from each other, and the directions (the second up-down direction) in which a second upper die-casting mold and a second lower die-casting mold, defining the outer shape of the second insert 110, are separated from each other, are different. Therefore, at least four die-casting molds are required.

[0047] In the following, each component of the ball joint assembly 100 is described as the first and second ball joint assembly 100a and 100b.

[0048] With reference to Fig. The ball joint assembly 100 comprises the mounting part 110 attached to the rod 11, a bearing 130 supported by the mounting part 110, and a ball stud 140 coupled to the bearing 130. The ball stud 140 includes a ball 141 and a pin 143 extending from the ball 141. The bearing 130 is arranged in the hole 110h formed in the mounting part 110.

[0049] The ball joint assembly 100 can include a dust cover 150 that prevents the ingress of foreign objects. Furthermore, the ball joint assembly 100 can include an upper fastening element 160 for attaching the dust cover 150 and a lower fastening element 170.

[0050] Fig. Figure 2 is a perspective exploded view of the ball joint assembly 100 made of Fig. 1, in which an insert injection molded part 120 is not shown.

[0051] With reference to Fig. 2 The ball joint assembly 100 includes the mounting part 110, which forms the hole 110h in the vertical direction along the central axis X. The mounting part 110 includes a frame part 111, which forms a frame along the circumference of the hole 110h. The frame part 111 can have an annular structure extending along the circumferential direction XC. The frame part 111 can be attached to one end of the rod 11.

[0052] The installation part 110 includes an inner circumferential region 113, which forms the hole 110h in the vertical direction. The inner circumferential region 113 is arranged in the radially inward direction XI of the frame region 111. At least one upper projecting region 113a is formed in an upper region of the inner circumferential region 113, and at least one lower projecting region 113b is formed in a lower region of the inner circumferential region 113.

[0053] The bearing 130 has a slotted area 135. A pair of slotted areas 135 can be arranged on opposite sides of an outer surface 133. The slotted area 135 is designed to extend downwards from the upper end of the bearing 130 by a predetermined distance. During the coupling of the bearing 130 and the ball 141, the slotted area 135 widens to allow the ball 141 to be inserted into the bearing 130. When the ball 141 is positioned within the bearing 130, the slotted area 135 narrows, thus ensuring the stable function of the bearing 130.

[0054] Fig. Figure 3 is a vertical cross-sectional view of the ball joint assembly 100 of Fig. 1, which runs along the S1-S1' line. Fig. Figure 4 is a vertical cross-sectional view of the ball joint assembly 100 of Fig. 1, which runs along the S2-S2' line.

[0055] With reference to Fig. 3 and Fig. Figure 4 of the inner circumferential region 113 comprises an upper region 113U, a middle region 113M, and a lower region 113L, arranged successively from top to bottom. The upper projecting portion 113a extends in the radially inward direction XI in the upper region 113U. The lower projecting portion 113b extends in the radially inward direction XI in the lower region 113L. The middle region 113M forms an inner diameter surface located further away from the central axis X than a projecting end of the upper projecting portion 113a and a projecting end of the lower projecting portion 113b.

[0056] Additionally, the ball joint assembly 100 includes the injection-molded insert 120, which fills a space formed in the hole 110h between the inner circumferential region 113 and an outer surface 133 of the bearing 130. The injection-molded insert 120 supports the bearing 130.

[0057] The insert injection molded part 120 can be formed by injection molding. The insert injection molded part 120 can be formed from a material with a higher stiffness than that of the bearing 130. For example, the insert injection molded part 120 can be formed by injection molding a glass fiber reinforced plastic (GFRP) material. In the present embodiment, the insert injection molded part 120 is formed from the GFRP in which 50% of a glass fiber (GF) component is contained in a nylon resin (PA6).

[0058] The insert injection molded part 120 can be inserted between the protruding end of the upper protruding region 113a and the outer surface 133 of the bearing 130. The insert injection molded part 120 includes an upper engagement region 120a, which is inserted between the upper region 113U of the inner circumferential region 113 and the outer surface 133 of the bearing 130. The upper engagement region 120a covers the protruding end of the upper protruding region 113a. The upper engagement region 120a covers both sides of the upper protruding region 113a in the circumferential direction.

[0059] The insert injection molded part 120 can be inserted between the protruding end of the lower protruding area 113b and the outer surface 133 of the bearing 130. The insert injection molded part 120 includes a lower engagement area 120b, which is inserted between the lower area 113L of the inner circumferential area 113 and the outer surface 133 of the bearing 130. The lower engagement area 120B covers the protruding end of the lower protruding area 113b. The lower engagement area 120B covers both sides of the lower protruding area 113b in the circumferential direction.

[0060] The insert injection molded part 120 contains a central engagement area 120c, which is filled between the central region 113M of the inner circumferential area 113 and the outer surface 133 of the bearing 130. The central engagement area 120c covers the lower surface of the upper protruding area 113a. The central engagement area 120c covers the upper surface of the lower protruding area 113b.

[0061] The insert injection molded part 120 includes an upper cover region 121 that covers the upper surface of the upper protruding region 113a. The upper cover region 121 can cover the upper end of the upper region 113U. A lower surface of the upper cover region 121 and a surface oriented in the radially outward direction XO, in the upper engagement region 120a, form an upper locking region (not shown). An upper edge of the inner circumferential region 113 engages with the upper locking region.

[0062] The insert injection molded part 120 includes a lower cover region 122 that covers a lower surface of the lower protruding region 113b. The lower cover region 122 can cover the lower end of the lower region 113L. An upper surface of the lower cover region 122 and a surface oriented in the radially outward direction XO in the lower engagement region 120b form a lower locking region (not shown). A lower edge of the inner circumferential region 113 engages with the lower locking region.

[0063] The upper engagement area 120a, the lower engagement area 120b, the middle engagement area 120c, the upper cover area 121, and the lower cover area 122 engage with various convex-concave areas formed in the inner circumferential area 113. This further improves the failure resistance of the coupling structure of the insert injection molded part 120 and the inner circumferential area 113 with respect to rotational moment, vertical load, lateral load, and the like.

[0064] On the other hand, the ball stud 140 comprises the ball 141 arranged below it and the pin 143 extending upwards from the ball 141. The ball 141 is spherical as a whole. The ball stud 140 can be configured to rotate around the center point BO of the ball 141 relative to the bearing 130. The center point BO of the ball 141 is defined in the hole 110h.

[0065] Meanwhile, the ball joint assembly 100 can include the bearing 130, which is coupled in such a way that it surrounds the ball 141. The bearing 130 can be formed by injection molding. For example, the bearing 130 can be formed by injection molding a polypropylene (POM) material. The bearing 130 can be manufactured separately by injection molding and then coupled to the ball stud 140.

[0066] The bearing 130 has an inner surface 131 with which the ball 141 slides in contact. The inner surface 131 is essentially an inwardly convex spherical surface that corresponds to the shape of the ball 141. The bearing 130 also has an outer surface 133, which is to be attached to the insert injection molded part 120 and is in contact with the insert injection molded part 120. The outer surface 133 can essentially be an outwardly convex spherical surface.

[0067] On the other hand, greater shrinkage can occur with increasing thickness of the area formed by insert injection molding. Therefore, the extent of shrinkage can vary depending on the thickness of each area formed by insert injection molding. In a comparative example that differs from an embodiment of the present disclosure, among the areas of an insert injection molded part positioned in a hole of an insert, an upper and a lower area are relatively thick, and an intermediate area is relatively thin. As a result, the upper and lower areas can experience greater shrinkage in the radial direction than the intermediate area.Accordingly, in the comparative example, when a lateral load acts on the insert injection molded part, the outer surface of the intermediate area of ​​the insert injection molded part comes into contact with an inner circumferential surface of the hole in front of the upper and lower areas, so that the lateral load can act intensively on the intermediate area.

[0068] The upper protruding area 113a and the lower protruding area 113b of the present disclosure reduce the thickness deviation of areas located in the hole of the insert injection molded part, thereby significantly reducing the risk of an area of ​​the insert injection molded part being subjected to intense stress due to shrinkage deviation.

[0069] For example, the upper protruding area 113a can be positioned above the center point BO and the lower protruding area 113b below the center point BO. This makes it possible to reduce the shrinkage deviation during the injection molding of the bearing 130 according to the position of the bearing 130.

[0070] For example, in a cross-section that vertically intersects the center BO of the sphere, the outer surface 133 of the bearing 130 can be shaped such that it projects furthest in the radially outward direction XO at a point below the upper projecting area 113a and above the lower projecting area 113b. The outermost area 133P is the area that projects furthest from the outer surface 133 of the bearing 130 in the radially outward direction XO. Accordingly, it is possible to reduce the shrinkage deviation during injection molding of the bearing 130 according to the position of the bearing 130.

[0071] If the bearing 130 is shaped to surround the ball 141 with a constant thickness, the outermost part 133P is arranged to project prominently from the outer surface 133 of the bearing 130 on a horizontal plane that intersects the center BO of the ball 141. The upper projecting part 113a can be located above the outermost part 133P, and the lower projecting part 113b can be located below the outermost part 133P.

[0072] The ball joint assembly 100 can enclose the dust cover 150, which is configured to prevent the ingress of foreign materials into the interface between the bearing 130 and the ball 141. The dust cover 150 extends circumferentially to enclose the ball stud 140. The dust cover 150 comprises an upper cover mounting area 150a located on its upper portion and a lower cover mounting area 150b located on its lower portion. The upper mounting area 150a of the cover can be secured by the upper mounting element 160 while in contact with the upper mounting area 145 of the ball stud 140.The lower mounting area 150b of the cover can be secured by the lower mounting element 170 while in contact with a lower mounting area 125 formed on the upper area of ​​the insert injection molded part 120.

[0073] The ball joint assembly 100 can include the upper fastening element 160, configured to secure an upper portion of the dust cover 150, and the lower fastening element 170, configured to secure a lower portion of the dust cover 150. Both the upper fastening element 160 and the lower fastening element 170 can be configured as ring clamps.

[0074] The upper mounting area 145 can have a groove area 145c shaped to receive the upper mounting area 150a of the cover. The groove area 145c can extend in the circumferential direction XC to be recessed in the radially inward direction XI. The upper mounting area 150a of the cover is located in the groove area 145c. The upper mounting area 145 can have a first upper rib 145a forming an upper end of the groove area 145c and a second upper rib 145b forming a lower end of the groove area 145c.

[0075] The lower mounting area 125 projects from an upper end region of the insert injection-molded part 120 in the radially outward direction XO and extends circumferentially. The lower mounting area 150b of the cover is interlocked with the lower mounting area 125. A groove is formed, which is recessed through the lower surface of the lower mounting area 125 and the upper surface of the insert 110 in the radially inward direction XI. The lower mounting area 150b of the cover is positioned in the groove.

[0076] The following refers to the upper protruding area 113a and the lower protruding area 113b with reference to Fig. 5 and Fig. 6 described in more detail. Fig. Figure 5 is a vertical cross-sectional view of the built-in component 110. Fig. 1, which runs along the S1-S1' line. Fig. Figure 6 is a view of the built-in part 110. Fig. 1 in the top view.

[0077] With reference to Fig. 5 The upper projecting part 113a extends from the upper region 113U in the radially inward direction XI. The upper projecting part 113a has a projecting end 113al oriented in the radially inward direction XI, an upper surface 113a2 connected to a top surface of the projecting end 113al, and a lower surface 113a3 connected to a bottom surface of the projecting end 113al. Furthermore, the upper projecting region 113a has a pair of side surfaces 113a4 arranged circumferentially on both sides of the projecting end 113al.

[0078] The lower projecting area 113b extends into the lower region 113L in the radially inward direction XI. The lower projecting area 113b has a projecting end 113bl oriented in the radially inward direction XI, an upper surface 113b2 connected to an upper end of the projecting end 113bl, and a lower surface 113b3 connected to a lower end of the projecting end 113b1. Furthermore, the lower projecting area 113b has a pair of side surfaces 113b4 arranged circumferentially on both sides of the projecting end 113bl.

[0079] With reference to Fig. 6. A plurality of upper protruding areas 113a can be provided. Furthermore, a plurality of lower protruding areas 113b can be provided. The number of upper protruding parts 113a and the number of lower protruding areas 113b can be the same.

[0080] The majority of upper protruding areas 113a can be spaced apart along the circumferential direction, and the majority of lower protruding areas 113b can be spaced apart along the circumferential direction. The majority of upper protruding areas 113a can be arranged along the circumferential direction on the same horizontal plane. The majority of lower protruding areas 113b can be arranged along the circumferential direction on the same horizontal plane. If the upper protruding area 113a and the lower protruding area 113b are shaped to extend 360 degrees in the circumferential direction, the stability of the coupling structure with respect to the rotational torque of the insert injection-molded part 120 cannot be achieved at the same level as in the present embodiment.Furthermore, the volume of the insert injection molded part 120 can be reduced unnecessarily, leading to a deterioration of its pull-out and push-out behavior with respect to the vertical load applied to the insert injection molded part 120. The terms "pull-out behavior" and "push-out behavior" used here refer to the extent to which the insert injection molded part 120 can withstand, without separating from the insert 110, when a load is applied to the insert injection molded part 120 in the upward and downward directions.

[0081] The upper and lower protruding areas can be arranged alternately in the circumferential direction. Such an arrangement makes it possible to stably withstand the lateral load exerted on the insert injection molded part 120 in various directions.

[0082] The upper projecting area 113a and the lower projecting area 113b, which lie side by side in the circumferential direction, can be arranged so that they abut each other in the circumferential direction or so that, viewed from above, they are spaced apart in the circumferential direction. That is, viewed from above, the upper projecting part 113a and the lower projecting part 113b must not overlap each other. In this embodiment, a gap is formed between the side surface 113a4 of the upper projecting area 113a and the side surface 113b4 of the lower projecting areas 113b, which lie side by side in the circumferential direction. This configuration improves the convenience and cost-effectiveness of manufacturing the component 110 by die casting, as described below.

[0083] The upper projecting area 113a can extend at an angle of 180 degrees or less in the circumferential direction. The two upper projecting areas 113a, which in the example of Fig. Figure 6 shows that AU1 and AU2 extend at an angle of 180 degrees or less in the circumferential direction. Furthermore, the sum of the angles AU1 and AU2 at which each of the plurality of upper projecting areas 113a extends in the circumferential direction can be 180 degrees or less.

[0084] The lower projecting area 113b can extend circumferentially at an angle of 180 degrees or less. The two lower projecting areas 113b, which in the example of Fig. As shown in Figure 6, AL1 and AL2 extend at an angle of 180 degrees or less in the circumferential direction.

[0085] Even more preferably, the sum of the angles AL1 and AL2, at which each of the plurality of lower protruding areas 113b extends in the circumferential direction, may be 180 degrees or less.

[0086] The upper projecting area 113a can extend circumferentially at an angle of approximately 10 degrees to 90 degrees. The lower projecting area 113b can extend circumferentially at an angle of approximately 10 degrees to 90 degrees. In an embodiment described with reference to Fig. As described in Figure 6, each of the two upper projecting areas 113a extends circumferentially at an angle of approximately 7.5 degrees to 85 degrees. In another embodiment, which refers to Figure 6, the upper projecting areas 113a extend circumferentially at an angle of approximately 7.5 degrees to 85 degrees. Fig. As described in Figure 7, each of the two upper protruding areas 113a can extend in the circumferential direction at an angle of approximately 10 degrees to 30 degrees.

[0087] Next, a built-in component 110' according to another embodiment is described with reference to Fig. 7 described. The installation part 110' according to another embodiment of the present invention comprises a plurality of upper projecting areas 113a, each of which extends circumferentially at an acute angle, and a plurality of lower projecting areas 113b, each of which extends circumferentially at an acute angle. In the installation part 110 according to one embodiment, the number of upper projecting areas 113a and the number of lower projecting areas 113a are each two. In the installation part 110' according to another embodiment, the number of upper projecting areas 113a and the number of lower projecting areas 113a are each six. However, the number of upper projecting areas 113a and the number of lower projecting areas 113a are not necessarily limited to these embodiments.

[0088] Next, a method for manufacturing the ball joint assembly will be described with reference to a flowchart. Fig. 8 described. In the flowchart of Fig. 8. A die-casting step S10 and a coupling step S20, which are in a parallel relationship to each other, can be performed in any suitable order. For example, the die-casting step S10 and the coupling step S20 can be performed simultaneously or not simultaneously. Alternatively, one of the die-casting step S10 and the coupling step S20 can be performed earlier than the other.

[0089] The manufacturing process comprises die-casting step S10 for producing the insert 110 by die casting. The insert 110 has a hole (110h) in the vertical direction, at least one upper protruding region 113a projecting towards the central axis X of the hole 110h in the upper region of the hole 110h, and at least one lower protruding region 113b projecting towards the central axis X in the lower region of the hole 110h. The at least one upper protruding region 113a and the at least one lower protruding region 113b can be formed alternately in the circumferential direction in the insert 110.

[0090] The manufacturing process includes coupling step S20, which involves coupling the bearing 130 and the ball stud 140. Before coupling step S20, the bearing 130 is formed by injection molding and the ball stud 140 is manufactured.

[0091] The manufacturing process comprises a positioning step S30 of positioning the bearing 130, to which the ball stud 140 is coupled, in the hole 110h of the mounting part 110 and of arranging an injection mold 230 on the mounting part 110. The positioning step S30 can be carried out after the die-casting step S10 and the coupling step S20.

[0092] The manufacturing process includes an injection molding step S40, in which an insert injection mold is performed through the injection mold 230 to fill the space of the hole 110h formed between the insert part 110 and the outer surface of the bearing 130. Injection molding step S40 forms the insert injection molded part 120 for supporting the bearing 130. Injection molding step S40 can be performed after the positioning step S30.

[0093] The manufacturing process can further include an assembly step S50, in which the dust cover 150 is assembled with the ball stud 140 and the insert injection molded part 120 after the injection molding step S40. In assembly step S50, the dust cover 150 can be mounted in a corresponding position with the upper fastening element 160 and the lower fastening element 170.

[0094] Next, the die-casting step S10 and a die-casting mold 210 are described with reference to Fig. 9A and Fig. 9B described in detail. Fig. Figure 9A is a partial cross-sectional view of the die-casting mold 210 and the insert 110, viewed along the line S3-S3' in Fig. 6. Fig. Figure 9B is a partial cross-sectional view of the die-casting mold 210 and the insert 110, viewed along the line S4-S4' in Fig. 6.

[0095] The die-casting device 210 comprises an upper die-casting mold 211 for defining one side of the insert 110 and a lower die-casting mold 213 for defining the other side of the insert 110. The upper die-casting mold 211 defines a top surface of the insert 110, and the lower die-casting mold 213 defines a bottom surface of the insert 110. The upper die-casting mold 211 defines the upper surface of the upper protruding area 113a and the upper surface of the lower protruding area 113b. The lower die-casting mold 213 defines the lower surface of the upper protruding area 113a and the lower surface of the lower protruding area 113b.

[0096] In die-casting step S10, the insert part 110 can be produced by injecting molten metal into a space formed between the upper die-casting mold 211 and the lower die-casting mold 213 in a state in which the upper die-casting mold 211 and the lower die-casting mold 213 are engaged with each other.

[0097] In the die-casting step S10, after the injected melt has solidified, the upper die-casting mold 211 and the lower die-casting mold 213 can be separated from each other in an upward direction Du and a downward direction DI, respectively. For this purpose, the upper die-casting mold 211 and the lower die-casting mold 213 can form a boundary B at the location of the upper protruding area 113a and a boundary B at the location of the lower protruding area 113b. With this configuration, it is possible to form the component 110 with the upper protruding area 113a and the lower protruding area 113b using only the two die-casting molds 211 and 213. The die-casting manufacturing process thus improves convenience and cost-effectiveness.

[0098] It is preferred that the upper projecting area and the lower projecting area do not overlap when viewed from above. If a lower projecting area V (113b) is located below the upper projecting area 113a in Fig. If the lower die-casting mold 213 is arranged in 9A, it cannot be separated downwards. Consequently, a larger number of die-casting molds are required. Similarly, if the upper protruding area V (113a) is positioned above the lower protruding area 113b in Fig. Because it is arranged in 9B, the upper die-casting mold 211 cannot be separated upwards. As a result, a larger number of die-casting molds are required.

[0099] Next, the injection step S40 and the injection mold 230 will be described with reference to Fig. 10 described in detail. Fig. Figure 10 is a partial cross-sectional view of the injection mold 230 and the ball joint assembly 100 along the line S1-S1' in Fig. 1.

[0100] The injection mold 230 comprises an upper mold 231 for defining an upper region of the insert injection molded part 120 and a lower mold 233 for defining a lower region of the insert injection molded part 120. The upper mold 231 can have two or more separable mold parts (not shown). The upper mold 231 and the lower mold 233 can be attached to the insert part 110 by a coupling element 235.

[0101] With the upper mold 231 and the lower mold 233 positioned within the insert 110, resin can be injected into a space formed by the hole 110h and the injection mold 230 to form the insert injection molded part 120. Before the insert injection molded part 120 has cured, the ball stud 140 can be supported by the upper mold 231.

[0102] Next, the size of the gap between the inner circumferential area 113 of the built-in part 110 and the insert injection molded part 120 is determined with reference to the Fig. 11A to Fig. 11E described. Fig. 11A to Fig. Figure 11E are diagrams showing the size of the radial gap between the insert injection molded part 120 and the inner circumferential region 113 with respect to the vertical position of the inner circumferential region 113, assuming a shrinkage ratio of the insert injection molded part 120 relative to its thickness in the radially outward direction XO and the radially inward direction XI of 0.3%. The vertical axis (y-axis) represents the vertical positions of the upper region 113U, the middle region 113M, and the lower region 113L of the inner circumferential region 113, with a unit of mm, and the horizontal axis (x-axis) represents the size of the gap, with a unit of mm.

[0103] Fig. 11A is a diagram that shows the four types of columns Go, Gu, Gl and Ga in a collective way, and Fig. 11B, Fig. 11C, Fig. 11D and Fig. 11E are diagrams showing the four types of columns Go, Gu, Gl, and Ga. The column Go in Fig. 11A to Fig. Figure 11E shows a gap in a ball joint arrangement according to a comparative example where the upper protruding area and the lower protruding area are not provided. The gap Gu in Fig. 11C represents a position where the upper protruding area 113a of the ball joint assembly 100 is arranged according to the present embodiment, and a gap above this position. The gap Gl in Fig. 11D represents a position where the lower protruding part 113b of the ball joint assembly 100 is arranged according to the present embodiment, and a gap above the position. The gap Ga in Fig. 11E represents an average value of the gap Gu in Fig. 11C and the gap Gl in Fig. 11D.

[0104] With reference to the Fig. 11A to Fig. In 11E, it was found that the gaps Gu and Gl in an area where the upper protruding area 113a or the lower protruding area 113b is formed are reduced by approximately 50% to 60% compared to the gap in the corresponding area in the comparison example. Furthermore, it was found that the average gap Ga is reduced by approximately 25% to 30% compared to the gap Go in the comparison example. As described above, according to the ball joint assembly 100 of the present disclosure, the gap between the insert injection molded part 120 and the inner circumferential area 113 can be significantly reduced, which makes it possible to facilitate the mechanical operation with the ball joint assembly 100 in a smoother manner and to considerably improve the durability of the insert injection molded part 120.

[0105] Next, an experimental example of the ball joint arrangement 100 according to an embodiment of the present disclosure is described with reference to Table 1 below. [Tabel] Drehmoment [Nm] AxialerSpalt [mm] RadialerSpalt [mm] Pull-out[kN] Push-out [kN] Vergleichsbeispiel #1 0.24 0.057 0.135 - - #2 0.24 0.040 0.149 5.82 - #3 0.31 0.039 0.138 - 8.49 eineAusführungsform #1 0.47 0.025 0.104 - - #2 0.4 0.030 0.111 5.96 - #3 0.53 0.030 0.106 - 9.79 weitereAusführungsform #1 0.5 0.028 0.110 - . #2 0.59 0.024 0.105 6.60 . #3 0.55 0.030 0.113 11.05

[0106] Table 1 above shows the test results obtained for three samples #1, #2 and #3 of the ball joint assembly in the comparative example, where the upper protruding part and the lower protruding part are not provided, three samples #1, #2 and #3 of the ball joint assembly 100 including the mounting part 110 according to the above with reference to Fig. 6 described embodiment, and three specimens #1, #2 and #3 of the ball joint assembly 100 including the installation part 110' according to the further embodiment described above, which refers to Fig.7 is described. In Table 1 above, the axial gap refers to the amount of play that arises when the load is applied vertically to the mounting part 110 with the mounting part 110 fixed. Furthermore, the radial gap refers to the amount of play that is generated when the load is applied to the ball stud 140 in the radially outward direction XO and the radially inward direction XI with the mounting part 110 fixed.

[0107] In Table 1 above, "torque" refers to the magnitude of the torque at the point in time when the coupling structure of the insert injection molded part 120 and the inner circumferential part 113 breaks when the torque is applied to the insert injection molded part 120 in the circumferential direction. "Pull-out" also refers to the magnitude of the force at the point in time when the coupling structure of the insert injection molded part 120 and the inner circumferential part 113 breaks when a force is applied to the insert injection molded part 120 in the upward direction. "Push-out" further refers to the magnitude of the force at the point in time when the coupling structure of the insert injection molded part 120 and the inner circumferential part 113 breaks when a force is applied to the insert injection molded part 120 in the downward direction.

[0108] Based on the above test results, it was confirmed that the radial and axial gaps in the above embodiment and in the further embodiment are significantly smaller than in the comparison example. Furthermore, based on the above test results, it was confirmed that the magnitudes of the torque, pull-out, and push-out are increased compared to those in the comparison example.

[0109] Although the basic technical concept of the present disclosure has been described with reference to several embodiments and examples shown in the accompanying drawings, it should be noted that various substitutions, modifications, and variations can be developed by a person skilled in the art in the field of the present disclosure without deviating from the basic technical concept and scope of the present disclosure. Furthermore, it can be assumed that these substitutions, modifications, and variations fall within the scope of the appended claims.

Claims

[1] A ball joint assembly (100, 100a, 100b) for a vehicle, comprising: a built-in part (110, 110') with an inner circumferential area (113) in which a hole (110h) is formed in an upward-downward direction; a ball stud (140) with a ball (141) and a stud (143) extending from the ball (141); a bearing (130) coupled in such a way that it surrounds the ball (141) and is arranged in the hole (110h); and an insert injection molded part (120) designed to fill a space formed between the inner circumferential region (113) and an outer surface (133) of the bearing (130) in the hole (110h), wherein the inner circumferential region (113) has at least one upper protruding region (113a) which protrudes in an upper region in a direction towards a central axis of the hole (110h), and at least one lower protruding region (113b) which protrudes in a lower region in the direction towards the central axis, characterized by the fact that, the at least one upper projecting area (113a) and the at least one lower projecting area (113b) which are adjacent to each other in a circumferential direction, are arranged so that they border each other in the circumferential direction or are arranged so that they are spaced apart from each other in the circumferential direction when viewed from above, and wherein the at least one upper projecting area (113a) and the at least one lower projecting area (113b) are arranged such that they do not overlap when viewed from above, and wherein the insert injection molded part (120) fills a gap between a protruding end of the at least one upper protruding area (113a) and the outer surface (133) of the bearing (130) and fills a gap between a protruding end of the at least one lower protruding area (113b) and the outer surface (133) of the bearing (130). [2] Ball joint arrangement (100, 100a, 100b) for a vehicle according to claim 1, wherein the at least one upper protruding area (113a) and the at least one lower protruding area (113b) are arranged alternately in a circumferential direction. [3] Ball joint arrangement (100, 100a, 100b) for a vehicle according to claim 1, wherein the at least one upper protruding area (113a) includes a plurality of upper protruding areas and the at least one lower protruding area (113b) includes a plurality of lower protruding areas, and wherein the plurality of upper protruding areas (113a) are arranged such that they are spaced apart from each other along a circumferential direction, and the plurality of lower protruding areas (113b) are arranged such that they are spaced apart from each other along the circumferential direction. [4] Ball joint assembly (100, 100a, 100b) for a vehicle according to claim 1, wherein the insert injection molded part (120) covers an upper surface of the at least one upper protruding area (113a) and covers a lower surface of the at least one lower protruding area (113b). [5] Ball joint assembly (100, 100a, 100b) for a vehicle according to claim 1, wherein the insert injection molded part (120) is formed by injection molding, a center point of the sphere (141) is positioned within the hole (110h), the at least one upper protruding area (113a) is arranged above the center of the sphere (141), and the at least one lower protruding area (113b) is arranged below the center of the sphere (141). [6] The ball joint assembly (100, 100a, 100b) for a vehicle according to claim 1, wherein the insert injection molded part (120) is formed by injection molding, a center point of the sphere (141) is positioned within the hole (110h), and on a cross-section extending along the center of the sphere (141) in the upward-downward direction, the outer surface (133) of the bearing (130) is shaped such that it protrudes furthest in a radially outward direction at a position that is lower than the at least one upper protruding area (113a) and higher than the at least one lower protruding area (113b). [7] Ball joint arrangement (100, 100a, 100b) for a vehicle according to claim 1, wherein the at least one upper protruding area (113a) extends in a circumferential direction at an angle of 180 degrees or less and the at least one lower protruding area (113b) extends in the circumferential direction at an angle of 180 degrees or less. [8] Ball joint arrangement (100, 100a, 100b) for a vehicle according to claim 1, wherein the at least one upper protruding area (113a) and the at least one lower protruding area (113b) each include a plurality of upper protruding areas (113a) and a plurality of lower protruding areas (113b), a sum of angles at which each of the plurality of upper projecting areas (113a) extends in a circumferential direction lies within a range of 180 degrees or less, and a sum of angles at which each of the plurality of lower protruding areas (113b) extends in the circumferential direction is in the range of 180 degrees or less. [9] Ball joint assembly (100, 100a, 100b) for a vehicle according to claim 1, wherein the at least one upper protruding area (113a) extends in a circumferential direction at an angle of 10 to 90 degrees and the at least one lower protruding area (113b) extends in a circumferential direction at an angle of 10 to 90 degrees. [10] Stabilizing element (10), comprising: a first built-in part (110, 110') with a first inner circumferential area (113) in which a first hole (110h) is formed in a first upward-downward direction along a first central axis; a first ball tenon (140) with a first ball (141) and a first tenon (143), extending from the first sphere (141); a first bearing (130) coupled such that it surrounds the first ball (141) and is arranged in the first hole (110h); a first insert injection molded part (120) designed to fill a space formed between the first inner circumferential region (113) and an outer surface (133) of the first bearing (130) in the first hole (110h); and a rod (11) with an end to which the first insert part (110, 110') is attached, wherein the first inner circumferential region (113) has at least a first upper projecting region (113a) projecting in a first upper region in a direction towards the first central axis, and at least a first lower projecting region (113b) projecting in a first lower region in the direction towards the first central axis, characterized by the fact that, the at least one upper projecting area (113a) and the at least one lower projecting area (113b) which are adjacent to each other in a circumferential direction, are arranged so that they border each other in the circumferential direction or are arranged so that they are spaced apart from each other in the circumferential direction when viewed from above, and wherein the at least one upper projecting area (113a) and the at least one lower projecting area (113b) are arranged such that they do not overlap when viewed from above, and wherein the insert injection molded part (120) fills a gap between a protruding end of the at least one upper protruding area (113a) and the outer surface (133) of the bearing (130) and fills a gap between a protruding end of the at least one lower protruding area (113b) and the outer surface (133) of the bearing (130). [11] The stabilizing member (10) according to claim 10, comprising: a second installation part (110, 110') with a second inner circumferential area (113) in which a second hole (110h) is formed in a second upward-downward direction along a second central axis, and which is provided for attachment to the other end of the rod; a second ball pin (140) with a second ball (141) and a second pin (143) extending from the second ball (141); a second bearing (130) coupled in such a way that it surrounds the second ball (141) and is arranged in the second hole (110h); and a second insert injection molded part (120) configured to fill a space formed between the second inner circumferential region (113) and an outer surface (133) of the second bearing (130) in the second hole (110h), wherein the second inner circumferential region (113) has at least a second upper protruding region (113a) projecting in a second upper region in a direction towards the second central axis, and at least a second lower protruding region (113b) projecting in a second lower region in the direction towards the second central axis. [12] Stabilizing member (10) according to claim 11, wherein the at least one first upper protruding area (113a) and the at least one first lower protruding area (113b) are arranged alternately in a circumferential direction and the at least one second upper protruding area (113a) and the at least one second lower protruding area (113b) are arranged alternately in the circumferential direction. [13] Stabilizing member (10) according to claim 11, wherein the first central axis and the second central axis are arranged parallel to each other. [14] Method for manufacturing a ball joint assembly (100, 100a, 100b) for a vehicle, the method comprising: a die-casting step (S10) of manufacturing an insert (110, 110') by die casting, wherein the insert (110, 110') includes a hole (110h) formed in an upward-downward direction, at least one upper protruding area (113a) projecting in the direction of a central axis of the hole (110h) in an upper region of the hole (110h), and at least one lower protruding area (113b) projecting in the direction of the central axis of the hole (110h) in a lower region of the hole (110h); a positioning step (S30) of positioning a bearing (130) with which a ball stud (140) is coupled in the hole (110h), and of arranging an injection mold (230) on the component (110, 110'); and an injection molding step (S40) for forming an insert injection molded part (120) which is designed to support the bearing (130) by applying an insert injection molding (230) into the injection mold to fill a space formed between the insert part (110, 110') and an outer surface (133) of the bearing (130) in the hole (110h), characterized in that, the at least one upper projecting area (113a) and the at least one lower projecting area (113b), which are adjacent to each other in a circumferential direction, are arranged such that they are adjacent to each other in the circumferential direction or are arranged such that they are spaced apart from each other in the circumferential direction when viewed from above, and wherein the at least one upper projecting area (113a) and the at least one lower projecting area (113b) are arranged such that they do not overlap when viewed from above, and wherein the insert injection molded part (120) fills a gap between a protruding end of the at least one upper protruding area (113a) and the outer surface (133) of the bearing (130) and fills a gap between a protruding end of the at least one lower protruding area (113b) and the outer surface (133) of the bearing (130). [15] Method according to claim 14, wherein in the die-casting step (S10) the insert (110, 110') is produced by injecting a molten metal into a space formed by an upper die-casting mold (211) and a lower die-casting mold (213) in a state in which the upper die-casting mold (211), which defines an upper surface of the at least one upper protruding region (113a) and an upper surface of the at least one lower protruding region (113b), and the lower die-casting mold (213), which defines a lower surface of the at least one upper protruding region (113a) and a lower surface of the at least one lower protruding region (113b), are engaged with each other. [16] Method according to claim 15, wherein the die-casting step (S10) comprises separating the upper die-casting mold (211) and the lower die-casting mold (213) from each other in an upward and downward direction respectively, after the injected molten metal has solidified. [17] Method according to claim 14, wherein the at least one upper protruding area (113a) and the at least one lower protruding area (113b) are formed alternately in a circumferential direction.

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