Ball pin seat, ball pin assembly, control arm ball pin assembly, and vehicle

Abstract

The application relates to a ball pin seat, a ball pin assembly, a control arm ball pin assembly and a vehicle, which comprises a seat body, a first opening and a positioning part, the seat body has a hollow accommodating cavity; the first opening is arranged at one end of the seat body and is used for limiting the swing range of a ball head pin, the first opening comprises two sets of limiting parts arranged oppositely, a first limiting part and a second limiting part have a first preset distance, a third limiting part and a fourth limiting part have a second preset distance, and the first preset distance is greater than the second preset distance; and the positioning part is arranged at the outer periphery of the seat body and is arranged in correspondence with one or more of the four limiting parts in the circumferential direction of the seat body. The application forms a large swing angle direction and a small swing angle direction through the opposite arrangement of the multiple limiting parts, the swing range of the ball head pin is increased, the pull-out force of the ball head pin is prevented from being reduced, the positioning part can be used for positioning the direction when the ball pin assembly is assembled with a control arm body, and the problem of swing angle direction deviation of the ball head pin caused by manual alignment error is eliminated.

Description

Technical Field

[0001] This application relates to the field of vehicle parts technology, specifically to a ball joint seat, a ball joint assembly, a control arm ball joint assembly, and a vehicle. Background Technology

[0002] In vehicle design and manufacturing, multi-link suspension structures have become the preferred choice for automotive suspension structures due to their superior performance. As overall vehicle performance requirements increase, the travel of shock absorbers continues to grow, further increasing the demands on the sway angle of ball joints at connection points such as control arms and steering knuckles.

[0003] Please see Figure 1 The existing ball joint seat 100 typically has a pin housing 101 and a tapered opening 102 at the end of the pin housing 101. The inclination angle and minimum diameter of the tapered opening 102 determine the swing range and pull-out force of the ball joint in the existing ball joint seat 100. When the diameter of the ball joint is fixed, increasing the size of the tapered opening 102 to expand the swing range will lead to a decrease in the pull-out force of the ball joint, which cannot meet the requirements of impact performance and connection reliability. This results in a contradiction between the large swing angle requirement of the ball joint and the pull-out force requirement, making it impossible to simultaneously meet the requirements of increasing the swing angle of the ball joint without reducing the pull-out force. Utility Model Content

[0004] One objective of this application is to provide a ball joint seat to solve the problem in the prior art that there is a contradiction between the large swing angle requirement of the ball joint and the ball joint pull-out force requirement, and that it is impossible to simultaneously meet the requirements of increasing the ball joint swing angle without reducing the ball joint pull-out force; the second objective is to provide a ball joint assembly; the third objective is to provide a control arm ball joint assembly; and the fourth objective is to provide a vehicle.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A ball joint seat, comprising:

[0007] A seat body having a hollow receiving cavity;

[0008] The first opening is located at one end of the seat and communicates with the receiving cavity; the first opening is used to limit the swing range of the ball pin, the first opening includes a first limiting part and a second limiting part arranged opposite to each other, and there is a first preset distance between the first limiting part and the second limiting part; the first opening also includes a third limiting part and a fourth limiting part arranged opposite to each other, and there is a second preset distance between the third limiting part and the fourth limiting part; the first preset distance is greater than the second preset distance.

[0009] A positioning part is disposed on the outer periphery of the seat body and is disposed in a circumferential direction corresponding to one or more of the first limiting part, the second limiting part, the third limiting part and the fourth limiting part.

[0010] According to the above technical means, since the first opening for extending the ball head pin has two sets of limiting parts arranged opposite to each other, there is a first preset distance between the first limiting part and the second limiting part, and a second preset distance between the third limiting part and the fourth limiting part. Since the first preset distance is larger, the first opening can form a larger opening size between the first limiting part and the second limiting part, thereby allowing the ball head pin to have a larger swing range between the first limiting part and the second limiting part. Since the second preset distance is smaller, the first opening can form a smaller opening size between the third limiting part and the fourth limiting part, which can limit the ball of the ball head pin, prevent the ball head pin from being pulled out of the first opening due to a smaller pull-out force, ensure a reliable connection between the ball head pin and the ball head pin seat, and increase the swing range of the ball head pin while avoiding a decrease in the pull-out force of the ball head pin. The positioning part is located on the outer periphery of the base body and is correspondingly arranged in the circumferential direction of one or more of the first limiting part, the second limiting part, the third limiting part and the fourth limiting part. It can indicate the position of any one of the limiting parts, so that the operator can provide positioning guidance when assembling the ball pin assembly, thereby placing the ball pin in a specific position in the large swing angle direction or small swing angle direction, and also facilitating the assembly accuracy inspection during the subsequent product delivery process.

[0011] Furthermore, the center line connecting the first limiting part and the second limiting part and the center line connecting the third limiting part and the fourth limiting part are perpendicular to each other, and the projection of the opening shape of the first opening on the axial direction of the seat body is a strip shape, a waist shape or an ellipse.

[0012] Based on the aforementioned technical means, the center lines connecting the first and second limiting parts and the center lines connecting the third and fourth limiting parts are perpendicular to each other. The swing angle space of the ball pin is divided into two orthogonal subspaces (i.e., the large swing angle direction and the small swing angle direction). This ensures that the large and small swing angle directions of the ball pin are perpendicular to each other, allowing the ball pin to gradually transition from the large swing angle direction to the small swing angle direction, or vice versa, as it rotates circumferentially along the first opening, rather than abruptly switching. This avoids cracks in the ball pin due to sudden stress increases and helps extend the service life of the ball pin assembly. The elongated, waist-shaped, and elliptical opening shapes, through asymmetrical layout, create a geometrically orthogonal relationship between the large and small swing angle directions. Optimizing the opening shape of the first opening reduces friction and impact experienced by the ball pin during rotation.

[0013] Furthermore, both the first limiting part and the second limiting part include limiting curved surfaces, and the two limiting curved surfaces are arranged opposite each other to form an open structure, the open structure facing the outside of the receiving cavity.

[0014] According to the above-mentioned technical means, the two limiting curved surfaces are arranged opposite to each other to form an open structure, which can be used to reduce the limitation of the first limiting part and the second limiting part on the swing range of the ball head pin in the large swing angle direction, thereby maximizing the swing range of the ball head pin.

[0015] Furthermore, both the third limiting portion and the fourth limiting portion include a flange extending toward the longitudinal axis of the receiving cavity, and the side of the flange facing the interior of the receiving cavity has a contact surface.

[0016] According to the aforementioned technical means, both the third and fourth limiting portions include flanges extending along the axis of the receiving cavity, such that the second preset distance is smaller than the diameter of the ball of the ball-end pin, thereby providing an anti-dislodgement limiting effect on the ball and ensuring that the pull-out force of the ball-end pin meets the requirements. A contact surface is provided on the side of the flange facing the interior of the receiving cavity, which can reduce the frictional resistance when the ball of the ball-end pin rotates in contact with the third or fourth limiting portion, thereby reducing the heat generated by friction between the ball-end pin and the ball-end pin seat, and simultaneously reducing wear during the rotation of the ball-end pin.

[0017] Furthermore, the two sides of the first limiting part smoothly transition to the third limiting part and the fourth limiting part, respectively, and the two sides of the second limiting part smoothly transition to the third limiting part and the fourth limiting part, respectively.

[0018] According to the above technical means, the two sides of the first limiting part smoothly transition to the third limiting part and the fourth limiting part, respectively, and the two sides of the second limiting part smoothly transition to the third limiting part and the fourth limiting part, respectively. This eliminates the geometric discontinuity caused by edges and sharp corners in the traditional limiting structure, so that the contact trajectory between the ball pin and the limiting surface presents a smooth transition feature. This can reduce the frictional resistance when the ball pin moves in the circumferential direction along the first opening, improve the smoothness of the ball pin assembly's movement, and help extend the service life of the ball pin assembly.

[0019] Furthermore, the surface of the first opening is provided with a wear-resistant coating.

[0020] According to the above technical means, the surface of the first opening is provided with a wear-resistant coating, which can improve the wear resistance of the surface of the first opening, thereby avoiding deviation of the swing range of the ball head pin due to wear of the first opening, and preventing the first opening from failing to play a reliable limiting role for the ball head pin due to wear.

[0021] Furthermore, the outer periphery of the seat has a protruding annular structure, and the positioning part is disposed on the annular structure.

[0022] According to the above technical means, the outer periphery of the seat has a protruding ring structure, which can be used to realize the installation limit of the ball pin seat on the control arm body. The positioning part is set on the ring structure, which can play a role in intuitively positioning the assembly direction when the ball pin seat is pressed or welded to the control arm body.

[0023] A ball pin assembly includes the ball pin seat described above, and also includes a ball head pin. The ball head pin includes a ball and a pin rod arranged coaxially. The connection between the ball and the pin rod is provided with an annular recess for adapting to the first opening. The annular recess and the first opening together define the swing range of the ball head pin.

[0024] According to the above-mentioned technical means, the connection between the ball and the pin is provided with an annular recess for matching the first opening. The interference between the first opening and the ball pin during rotation can be reduced by the annular recess, thereby increasing the swing range of the ball pin relative to the ball pin seat, which can meet the needs of high-mobility vehicles (such as SUVs) for large-angle swing of the suspension system.

[0025] Furthermore, the ball pin assembly also includes a ball cup and an end cap. The other end of the seat is provided with a second opening, the end cap is embedded in the second opening, the ball cup is disposed inside the receiving cavity, and the ball is rotatably disposed inside the ball cup.

[0026] According to the aforementioned technical means, a second opening is provided at the other end of the seat body. The size of the second opening is larger than the diameter of the ball of the ball-head pin, so that the ball-head pin can be inserted into the receiving cavity through the second opening. An end cap is embedded in the second opening to close it and prevent the ball-head pin from coming out. A ball cup is set inside the receiving cavity, and the ball is rotatably set inside the ball cup. The outer surface of the ball cup is interference-fitted with the inner wall of the receiving cavity to prevent the ball cup from loosening during the rotation of the ball-head pin. The curvature of the inner surface of the ball cup is matched with the curvature of the ball surface of the ball of the ball-head pin to ensure that the two form surface contact rather than point contact, thereby distributing the load and avoiding local stress concentration on the surface of the ball.

[0027] Furthermore, the ball pin assembly also includes a dust cover and a retaining spring. The seat body has a retaining groove at one end near the first opening. The dust cover is sleeved on the outside of the pin rod, and one end of the dust cover is disposed in the retaining groove and fixed by the retaining spring.

[0028] According to the above technical means, one end of the dust cover is set in the slot and fixed by the snap ring, which can achieve the sealing of the connection area between the ball head pin and the ball head pin seat by the dust cover, preventing external impurities from entering the interior of the receiving cavity and affecting the service life of the ball head pin assembly.

[0029] A control arm ball pin assembly includes the ball pin component described above, and also includes a control arm body. The ball pin seat is fixedly disposed on the control arm body, and the ball pin can swing relative to the control arm body.

[0030] Based on the above technical means, the control arm ball joint assembly is connected to the ball joint seat of the ball joint via the ball head pin (i.e., ball joint connection), which allows multi-directional relative movement (pitch, yaw, axial extension) between the control arm body and the steering knuckle (or linkage, wheel bracket), and can perfectly adapt to the complex movement requirements of multi-link suspension.

[0031] A vehicle comprising the aforementioned control arm ball joint assembly.

[0032] Based on the aforementioned technical methods, the control ball joint assembly is installed within the vehicle's suspension structure. Through multi-directional motion transmission and load distribution, precise motion control of the suspension system is achieved, which improves vehicle handling stability, ride comfort, and structural reliability. By allowing the ball joint to swing in a large sway direction, the swing angle of the ball joint can be increased, allowing the control arm to swing relative to the vehicle body within a wider range. This enables the vehicle to meet the large stroke requirements of the overall vehicle performance shock absorbers, thereby enhancing product competitiveness and brand image.

[0033] The beneficial effects of this application are:

[0034] (1) By setting the first limiting part, the second limiting part, the third limiting part and the fourth limiting part in pairs to form a large swing angle direction and a small swing angle direction, the swing range of the ball head pin can be increased while avoiding the reduction of the pull-out force of the ball head pin. This can solve the problem in the prior art that it is impossible to simultaneously meet the requirements of increasing the swing angle of the ball head pin without reducing the pull-out force of the ball head pin.

[0035] (2) This application establishes a precise correspondence between the positioning part and the selected limiting part (any one or more of the first to fourth limiting parts) in the circumferential direction of the ball pin seat body. It can indicate the limiting part corresponding to the large swing angle direction or the small swing angle direction. It can be used to position the direction when assembling the ball pin assembly and the control arm body. It eliminates the problem of ball pin swing angle direction deviation caused by manual alignment error in traditional assembly. It can ensure that the large swing angle direction or the small swing angle direction is strictly matched with the vehicle design coordinate system, and meet the high precision requirements of the multi-link suspension system for wheel kinematic characteristics. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the existing ball joint seat structure;

[0037] Figure 2 This is a schematic diagram of the structure of the ball pin assembly provided in the embodiments of this application;

[0038] Figure 3An exploded view of the ball pin assembly provided in the embodiments of this application;

[0039] Figure 4 A schematic diagram of the structure of the ball joint seat provided in the embodiments of this application. Figure 1 ;

[0040] Figure 5 A schematic diagram of the structure of the ball joint seat provided in the embodiments of this application. Figure 2 ;

[0041] Figure 6 A top view of the ball joint seat provided in an embodiment of this application;

[0042] Figure 7 This is a schematic diagram of the structure of the ball head pin provided in an embodiment of this application;

[0043] Figure 8 The ball pin assembly provided in the embodiments of this application is along Figure 6 A partial sectional view of AA;

[0044] Figure 9 The ball pin assembly provided in the embodiments of this application is along Figure 6 A partial sectional view of BB;

[0045] Figure 10 This is a schematic diagram of the control arm ball pin assembly provided in an embodiment of this application;

[0046] Figure 11 An exploded view of the control arm ball pin assembly provided in an embodiment of this application.

[0047] Wherein, 1-ball pin seat; 11-seat body; 12-first opening; 121-first limiting part; 1211-first limiting curved surface; 122-second limiting part; 1221-second limiting curved surface; 123-third limiting part; 1231-first contact curved surface; 1232-first stop surface; 124-fourth limiting part; 1241-second contact curved surface; 1242-second stop surface; 13-positioning part; 14-annular structure; 15-second opening; 16-slot;

[0048] 2-Ball head pin; 21-Spherical body; 22-Pin rod; 221-Conical part; 222-Connecting part; 23-Annular recessed part;

[0049] 3-Ball Bowl;

[0050] 4-End cap;

[0051] 5-Dust cover;

[0052] 6-Snap ring;

[0053] 7-Control arm body; 71-Mounting hole;

[0054] 100 - Existing ball pin seat; 101 - Pin housing; 102 - Conical opening. Detailed Implementation

[0055] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0056] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0057] This application provides a ball pin seat 1, including a seat body 11, a first opening 12, and a positioning part 13, as shown in the embodiment. Figure 4 and Figure 5 As shown, the seat body 11 has a hollow cavity for accommodating the ball 21 of the ball joint pin 2, so that the ball joint pin 2 and the seat body 11 can form a ball joint connection. A first opening 12 is provided at one end of the seat body 11 and communicates with the cavity. The pin 22 of the ball joint pin 2 can extend from the first opening 12 to facilitate rigid connection with other components in the suspension structure, thereby realizing the transmission of force and motion.

[0058] Please see Figure 5 , Figure 6 , Figure 8 and Figure 9 The first opening 12 is used to limit the swing range of the ball head pin 2. The first opening 12 includes a first limiting part 121 and a second limiting part 122 arranged opposite to each other, with a first preset distance L1 between the first limiting part 121 and the second limiting part 122. The first opening 12 also includes a third limiting part 123 and a fourth limiting part 124 arranged opposite to each other, with a second preset distance L2 between the third limiting part 123 and the fourth limiting part 124. The first preset distance L1 is greater than the second preset distance L2. Figure 6 As shown.

[0059] Because the first preset distance L1 is relatively large, the first opening 12 can form a large opening size between the first limiting part 121 and the second limiting part 122, thereby allowing the ball head pin 2 to have a large swing range between the first limiting part 121 and the second limiting part 122. The swing direction of the ball head pin 2 between the first limiting part 121 and the second limiting part 122 is the direction of large swing angle, and the maximum swing angle of the ball head pin 2 between the first limiting part 121 and the second limiting part 122 is 2α. Figure 8 As shown, the dashed line represents the swing limit position of the ball pin 2 in the direction of the large swing angle.

[0060] The smaller second preset distance L2 between the third limiting part 123 and the fourth limiting part 124 allows the first opening 12 to form a smaller opening size between the third limiting part 123 and the fourth limiting part 124. This can limit the ball 21 of the ball head pin 2, preventing the ball head pin 2 from disengaging from the first opening 12 due to the smaller pull-out force, thus ensuring a reliable connection between the ball head pin 2 and the ball head pin seat 1. The swing direction of the ball head pin 2 between the third limiting part 123 and the fourth limiting part 124 is a small swing angle direction. At this time, the maximum swing angle of the ball head pin 2 between the third limiting part 123 and the fourth limiting part 124 is 2β. Figure 9 As shown, the dashed line represents the swing limit position of the ball pin 2 in the small swing angle direction.

[0061] The positioning part 13 is disposed on the outer periphery of the base 11 and is disposed in the circumferential direction of one or more of the first limiting part 121, the second limiting part 122, the third limiting part 123 and the fourth limiting part 124. It can indicate and position the position of any one of the limiting parts, so that the operator can provide positioning guidance when assembling the ball pin assembly, thereby placing the ball head pin 2 in a specific position in the large swing angle direction or the small swing angle direction, and also facilitating the assembly accuracy inspection during the subsequent product delivery process.

[0062] It should be noted that by forming large and small swing angle directions through the pairwise relative arrangement of the first limiting part 121, the second limiting part 122, the third limiting part 123, and the fourth limiting part 124, the swing range of the ball joint pin 2 can be increased while avoiding a decrease in the pull-out force of the ball joint pin 2. This solves the problem in the prior art that it is impossible to simultaneously meet the requirements of increasing the swing angle of the ball joint pin 2 without reducing the pull-out force of the ball joint pin 2. On this basis, the positioning part 13 and the selected limiting part (any one or more of the first to fourth limiting parts) form a precise correspondence in the circumferential direction of the seat body 11 of the ball joint seat 1. This can indicate the limiting part corresponding to the large or small swing angle direction, and can be used to position the direction when assembling the ball joint assembly with the control arm body 7. This eliminates the problem of ball joint pin 2 swing angle direction deviation caused by manual alignment errors in traditional assembly, and can ensure that the large or small swing angle direction is strictly matched with the vehicle design coordinate system, meeting the high precision requirements of the multi-link suspension system for wheel kinematic characteristics.

[0063] It should be noted that the first preset distance L1 between the first limiting part 121 and the second limiting part 122 can be set according to the maximum swing angle requirement of the ball pin 2, and the second preset distance L2 between the third limiting part 123 and the fourth limiting part 124 can be set according to the pull-out force requirement of the ball pin 2. For example, when L2 is smaller than the diameter of the ball 21 of the ball pin 2, the ball 21 of the ball pin 2 cannot be dislodged from the first opening 12. In this case, L1 can be set large enough to simultaneously meet the pull-out force requirement and the large swing angle requirement of the ball pin 2.

[0064] In some embodiments of this application, please refer to Figure 6 The center lines connecting the first limiting part 121 and the second limiting part 122 and the center lines connecting the third limiting part 123 and the fourth limiting part 124 are perpendicular to each other. The swing angle space of the ball pin 2 is divided into two orthogonal subspaces (i.e., the large swing angle direction and the small swing angle direction). This makes the large swing angle direction and the small swing angle direction of the ball pin 2 perpendicular to each other. As the ball pin 2 rotates circumferentially along the first opening 12, it gradually transitions from the large swing angle direction to the small swing angle direction, or from the small swing angle direction to the large swing angle direction, rather than switching abruptly. This can avoid cracks in the ball pin 2 due to sudden stress increase and is beneficial to improving the service life of the ball pin assembly.

[0065] The projection of the opening shape of the first opening 12 onto the axial direction of the seat 11 is elongated, waist-shaped, or elliptical. When the ball pin 2 moves in contact with the first opening 12 in the circumferential direction, its swing path is restricted by the opening shape of the first opening 12. When the ball pin 2 rotates in the circumferential direction of the first opening 12, the change in the contour shape of the first opening 12 will dynamically adjust the contact point position between the ball pin 2 and the seat 11. The elongated, waist-shaped, and elliptical opening shapes, through asymmetrical layout, make the large swing angle direction and the small swing angle direction geometrically orthogonal. By optimizing the opening shape of the first opening 12, the friction and impact experienced by the ball pin 2 during rotation can be reduced.

[0066] In some embodiments of this application, please refer to Figure 8 The first limiting part 121 and the second limiting part 122 both include limiting curved surfaces. The two limiting curved surfaces are arranged opposite each other to form an open structure. The open structure faces the outside of the receiving cavity and can be used to reduce the limitation of the first limiting part 121 and the second limiting part 122 on the swing range of the ball head pin 2 in the large swing angle direction, thereby maximizing the swing range of the ball head pin 2.

[0067] In some embodiments of this application, please refer to Figure 6 and Figure 8 The first limiting part 121 includes a first limiting curved surface 1211, and the second limiting part 122 includes a second limiting curved surface 1221. The first limiting curved surface 1211 and the second limiting curved surface 1221 are symmetrically arranged about the axis of the seat 11, and the first limiting curved surface 1211 and the second limiting curved surface 1221 are arranged opposite to each other to form an open structure. When the side wall of the ball head pin 2 contacts the first limiting curved surface 1211 or the second limiting curved surface 1221, the ball head pin 2 can be supported and rotated and guided by the first limiting curved surface 1211 or the second limiting curved surface 1221.

[0068] In some embodiments of this application, please refer to Figure 5 , Figure 6 and Figure 9 Both the third limiting part 123 and the fourth limiting part 124 include flanges extending toward the longitudinal axis of the receiving cavity, so that the second preset distance L2 is less than the diameter of the ball 21 of the ball head pin 2, thereby providing an anti-dislodgement limiting effect on the ball 21 and ensuring that the pull-out force of the ball head pin 2 meets the requirements. The side of the flange facing the inside of the receiving cavity is provided with a contact surface, which can be used to reduce the frictional resistance when the ball 21 of the ball head pin 2 contacts and rotates with the third limiting part 123 or the fourth limiting part 124, thereby reducing the heat generated by friction between the ball head pin 2 and the ball head pin seat 1, and reducing the wear of the ball head pin 2 during rotation.

[0069] It should be noted that the longitudinal axis of the receiving cavity is the axis of the seat 11. The flange extends toward the longitudinal axis of the receiving cavity, which can reduce the minimum distance between the third limiting part 123 and the fourth limiting part 124, thereby ensuring that the pull-out force of the ball head pin 2 in the first opening 12 meets the requirements.

[0070] In some embodiments of this application, please refer to Figure 6 and Figure 9 The third limiting part 123 includes a first contact surface 1231 and a first stop surface 1232 connected together, and the fourth limiting part 124 includes a second contact surface 1241 and a second stop surface 1242 connected together. The first stop surface 1232 and the second stop surface 1242 are used to limit the swing range of the ball head pin 2, and a second preset distance L2 is formed between the first stop surface 1232 and the second stop surface 1242. The first contact surface 1231 and the second contact surface 1241 are both spherical surfaces that match the ball 21 of the ball head pin 2, which can reduce the frictional resistance when the ball head pin 2 rotates relative to the first contact surface 1231 or the second contact surface 1241.

[0071] In some embodiments of this application, please refer to Figure 5 The two sides of the first limiting part 121 smoothly transition to the third limiting part 123 and the fourth limiting part 124, respectively. The two sides of the second limiting part 122 smoothly transition to the third limiting part 123 and the fourth limiting part 124, respectively. This eliminates the geometric discontinuity caused by edges and sharp corners in the traditional limiting structure, so that the contact trajectory between the ball pin 2 and the limiting surface presents a smooth transition feature. This can reduce the frictional resistance when the ball pin 2 moves in contact along the circumferential direction of the first opening 12, improve the smoothness of the ball pin assembly's movement, and help extend the service life of the ball pin assembly.

[0072] In some embodiments of this application, the surface of the first opening 12 is provided with a wear-resistant coating, which can improve the wear resistance of the surface of the first opening 12, thereby avoiding deviation in the swing range of the ball head pin 2 due to wear of the first opening 12, and preventing the first opening 12 from failing to reliably limit the ball head pin 2 due to wear.

[0073] In some embodiments of this application, the wear-resistant coating can be a hard chrome plating, an alumina coating, or a polytetrafluoroethylene (PTFE) composite coating, which can improve the wear resistance of the first opening 12. As a preferred embodiment of this application, the wear-resistant coating is a PTFE composite coating. While improving the wear resistance of the surface of the first opening 12, the PTFE composite coating has a low coefficient of friction, which can reduce the frictional resistance when the ball pin 2 contacts the surface of the first opening 12, and can significantly reduce the wear of the surfaces of the first opening 12 and the ball pin 2.

[0074] In some embodiments of this application, please refer to Figure 4 , Figure 5 and Figure 10 The outer periphery of the seat 11 has a protruding annular structure 14, which can be used to limit the installation of the ball pin seat 1 on the control arm body 7. The positioning part 13 is provided on the annular structure 14, which can play a role in intuitively positioning the assembly direction when the ball pin seat 1 is pressed or welded to the control arm body 7.

[0075] For details, please refer to Figure 4 , Figure 5 and Figure 10 The annular structure 14 is an annular boss extending outward along the radial direction of the seat 11, forming a rigid stop shoulder on the outer periphery of the seat 11. It can abut against one side of the mounting hole 71 of the control arm body 7, bear the axial shear force after the ball pin seat 1 is assembled with the control arm body 7, and prevent the ball pin seat 1 from sliding out of the mounting hole 71 of the control arm body 7. Figure 10 It disengages downwards. The positioning part 13 is a V-shaped groove formed on the annular structure 14, and the sharp corner of the V-shaped groove points to the direction of the large swing angle. It can indicate the direction of the large swing angle of the ball pin assembly when the ball pin seat 1 is assembled with the control arm body 7, so as to ensure that the direction of the large swing angle or the direction of the small swing angle is strictly matched with the vehicle design coordinate system.

[0076] It should be noted that the positioning part 13 can be a text label or a shape label. When multiple shape labels indicate multiple limiting parts, the multiple shape labels have different shape characteristics to facilitate the differentiation of different limiting part orientations. When the large swing angle direction and the small swing angle direction are perpendicular to each other, it is only necessary to indicate one of the limiting parts through the positioning part 13 to provide positioning guidance for the operator when assembling the ball pin assembly, such as... Figure 6 As shown, at this point, only a text icon or a shape icon needs to be set.

[0077] Please see Figures 1 to 11 This application also proposes a ball pin assembly, including the ball pin seat 1 described in the above embodiments, and a ball head pin 2. The ball head pin 2 includes a ball 21 and a pin 22 coaxially arranged, wherein the ball 21 is rotatably disposed inside the receiving cavity of the ball pin seat 1, and the pin 22 is used to connect with other components in the suspension structure (such as connecting rods or steering knuckles). When the ball 21 rotates inside the ball pin seat 1, the pin 22 moves synchronously with the ball 21, thereby oscillating relative to the ball pin seat 1.

[0078] The connection between the ball 21 and the pin 22 is provided with an annular recess 23 for matching the first opening 12. The annular recess 23 and the first opening 12 together limit the swing range of the ball pin 2. The interference between the first opening 12 and the ball pin 2 during rotation can be reduced by the annular recess 23, thereby increasing the swing range of the ball pin 2 relative to the ball pin seat 1. This can meet the needs of high-mobility vehicles (such as SUVs) for large-angle swing of the suspension system.

[0079] In some embodiments of this application, please refer to Figure 3 , Figure 8 and Figure 9 The ball pin assembly also includes a ball cup 3 and an end cap 4. The other end of the seat 11 has a second opening 15, the size of which is larger than the diameter of the ball 21 of the ball head pin 2, so that the ball head pin 2 can be inserted into the receiving cavity through the second opening 15. The end cap 4 is embedded in the second opening 15 to close it and prevent the ball head pin 2 from coming out. The ball cup 3 is disposed inside the receiving cavity, and the ball 21 is rotatably disposed inside the ball cup 3. The outer surface of the ball cup 3 is interference-fitted with the inner wall of the receiving cavity to prevent loosening of the ball cup 3 during the rotation of the ball head pin 2. The curvature of the inner surface of the ball cup 3 is matched with the curvature of the surface of the ball 21 of the ball head pin 2, ensuring that they form surface contact rather than point contact, thereby distributing the load and avoiding local stress concentration on the surface of the ball 21.

[0080] In some embodiments of this application, please refer to Figure 2 and Figure 3 The ball pin assembly also includes a dust cover 5 and a retaining spring 6. The end of the seat 11 near the first opening 12 is provided with a groove 16. The dust cover 5 is sleeved on the outside of the pin 22. One end of the dust cover 5 is set in the groove 16 and fixed by the retaining spring 6. This can achieve the sealing of the connection area between the ball head pin 2 and the ball pin seat 1 by the dust cover 5, preventing external impurities from entering the interior of the receiving cavity and affecting the service life of the ball pin assembly.

[0081] It should be noted that the dust cover 5 is made of flexible material (such as rubber) and can deform with the swing of the ball head pin 2, so as to avoid the dust cover 5 from having an adverse effect on the swing of the ball head pin 2.

[0082] Please see Figures 1 to 11 This application also proposes a control arm ball pin assembly, including the ball pin assembly described in the above embodiments, and a control arm body 7. The ball pin seat 1 is fixedly disposed on the control arm body 7, and the ball head pin 2 can swing relative to the control arm body 7, thereby realizing the transmission between the control arm body 7 and other components in the suspension structure.

[0083] Specifically, the pin 22 of the ball joint pin 2 includes a tapered portion 221 and a connecting portion 222. The tapered portion 221 is interference-fitted with the dust cover 5 to prevent impurities from entering the interior of the dust cover 5 through the gap between the outer surface of the tapered portion 221 and the dust cover 5. The connecting portion 222 is provided with a connecting hole, which can be used to rigidly connect with other components in the suspension structure (such as steering knuckle, connecting rod and wheel bracket). The control arm ball joint assembly is connected to the ball joint seat 1 through the ball joint pin 2 (i.e. ball joint connection), which allows multi-directional relative movement (pitch, yaw, axial extension) between the control arm body 7 and the steering knuckle (or connecting rod, wheel bracket), which can perfectly adapt to the complex movement requirements of the multi-link suspension.

[0084] Please see Figures 1 to 11 This application also proposes a vehicle including the control arm ball joint assembly described in the above embodiments. The control arm ball joint assembly is installed in the vehicle's suspension structure. Through multi-directional motion transmission and load distribution, it achieves precise motion control of the suspension system, which is beneficial for improving vehicle handling stability, ride comfort, and structural reliability. By swinging the ball joint 2 in a large swing angle direction, the swing angle of the ball joint 2 can be increased, allowing the control arm body 7 to swing relative to the vehicle body within a wider range. This enables the vehicle to meet the large stroke requirements of the overall vehicle performance shock absorber, which is beneficial for improving product competitiveness and brand power.

[0085] Please see Figures 1 to 11 In some embodiments of this application, the assembly process of the control arm ball pin assembly is as follows:

[0086] Step 1: Assemble the ball bowl 3 with the ball body 21 of the ball head pin 2;

[0087] Step 2: Insert the ball head pin 2 and ball cup 3 into the second opening 15 of the seat body 11, so that the pin 22 extends out from the first opening 12. Under the limiting action of the first limiting part 121, the second limiting part 122, the third limiting part 123 and the fourth limiting part 124, the pin 22 has a large swing angle direction and a small swing angle direction; the ball cup 3 and the ball head pin 2's ball body 21 are embedded in the receiving cavity of the seat body 11;

[0088] Step 3: Insert the end cap 4 into the second opening 15;

[0089] Step 4: Place the dust cover 5 on the outside of the ball pin 2, and fix one end of the dust cover 5 in the slot 16 of the ball pin seat 1 by the snap ring 6;

[0090] Step 5: Assemble the ball pin assembly with the control arm body 7. During the assembly process, the assembly direction is positioned by the positioning part 13.

[0091] This application optimizes the opening structure of the ball pin seat 1. A large swing angle direction with a larger opening size is formed by the first limiting part 121 and the second limiting part 122 oppositely arranged on the first opening 12, while a small swing angle direction with a smaller opening size is formed by the third limiting part 123 and the fourth limiting part 124 oppositely arranged on the first opening 12. This satisfies both the large swing angle range requirement and the pull-out force requirement of the ball pin 2. Furthermore, a positioning part 13 marks the position of the limiting parts, facilitating positioning guidance for operators during ball pin assembly, thereby ensuring that the large or small swing angle direction of the ball pin 2 is in a specific orientation.

[0092] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A ball pin seat (1) characterized in that, include: The seat (11) has a hollow receiving cavity; The first opening (12) is disposed at one end of the seat (11) and communicates with the receiving cavity; the first opening (12) is used to limit the swing range of the ball head pin (2); the first opening (12) includes a first limiting part (121) and a second limiting part (122) disposed opposite to each other; there is a first preset distance between the first limiting part (121) and the second limiting part (122); the first opening (12) also includes a third limiting part (123) and a fourth limiting part (124) disposed opposite to each other; there is a second preset distance between the third limiting part (123) and the fourth limiting part (124); the first preset distance is greater than the second preset distance. The positioning part (13) is disposed on the outer periphery of the seat (11) and is disposed in a circumferential direction corresponding to one or more of the first limiting part (121), the second limiting part (122), the third limiting part (123) and the fourth limiting part (124) on the seat (11).

2. A ball socket (1) according to claim 1, characterized in that The center line connecting the first limiting part (121) and the second limiting part (122) and the center line connecting the third limiting part (123) and the fourth limiting part (124) are perpendicular to each other, and the projection of the opening shape of the first opening (12) on the axial direction of the seat body (11) is a long strip, waist-shaped or elliptical shape.

3. A ball socket (1) according to claim 1, characterized in that Both the first limiting part (121) and the second limiting part (122) include limiting curved surfaces, and the two limiting curved surfaces are arranged opposite each other to form an open structure, which faces the outside of the receiving cavity.

4. A ball socket (1) according to claim 1, characterized in that Both the third limiting part (123) and the fourth limiting part (124) include a flange extending toward the longitudinal axis of the receiving cavity, and the flange has a contact surface on the side facing the inside of the receiving cavity.

5. A ball socket (1) according to any one of claims 1 to 4, characterized in that The two sides of the first limiting part (121) smoothly transition with the third limiting part (123) and the fourth limiting part (124), respectively, and the two sides of the second limiting part (122) smoothly transition with the third limiting part (123) and the fourth limiting part (124), respectively.

6. A ball socket (1) according to any one of claims 1 to 4, characterized in that The surface of the first opening (12) is provided with a wear-resistant coating.

7. A ball socket (1) according to any one of claims 1 to 4, characterized in that The outer periphery of the seat (11) has a protruding annular structure (14), and the positioning part (13) is disposed on the annular structure (14).

8. A ball pin assembly characterized by, The ball pin seat (1) as described in any one of claims 1-7 is further comprising a ball head pin (2), wherein the ball head pin (2) comprises a ball (21) and a pin (22) arranged coaxially, and the connection between the ball (21) and the pin (22) is provided with an annular recess (23) for adapting to the first opening (12), wherein the annular recess (23) and the first opening (12) together define the swing range of the ball head pin (2).

9. The ball pin assembly of claim 8, wherein, It also includes a ball bowl (3) and an end cap (4). The other end of the seat (11) is provided with a second opening (15). The end cap (4) is embedded in the second opening (15). The ball bowl (3) is disposed inside the receiving cavity. The ball (21) is rotatably disposed inside the ball bowl (3).

10. A ball pin assembly according to claim 8 or 9, characterized in that It also includes a dust cover (5) and a retaining ring (6). The seat (11) has a groove (16) at one end near the first opening (12). The dust cover (5) is sleeved on the outside of the pin (22). One end of the dust cover (5) is set in the groove (16) and fixed by the retaining ring (6).

11. A control arm ball pin assembly, characterized in that, The assembly includes the ball pin assembly as described in any one of claims 8-10, and further includes a control arm body (7), wherein the ball pin seat (1) is fixedly disposed on the control arm body (7), and the ball head pin (2) is swayable relative to the control arm body (7).

12. A vehicle characterized by comprising: Includes the control arm ball pin assembly as described in claim 11.

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