Multi-angle adjustable circuit board welding device

Abstract

The application belongs to the technical field of electronic welding auxiliary, and discloses a multi-angle adjustable circuit board welding device, which comprises a supporting mechanism, a limiting mechanism and a ball hinge head.The supporting mechanism comprises a base and a support, the support is fixedly installed above the base, the limiting mechanism is arranged on the supporting mechanism, the ball hinge head is arranged in the limiting mechanism, and a circular hole is formed in the bottom of the ball hinge head.The ball block extrusion realizes primary locking, and the limiting rod inserted into the circular hole realizes secondary locking, so that the double locking mechanism ensures that the ball hinge head will not be loose during the welding process, the locking force is uniform and stable, the problem of insufficient locking force of the ball hinge in the prior art is solved, the hemispherical ball block is attached to the inner surface of the ball hinge head, a plurality of limiting components are annularly distributed at the bottom of the ball block, the stress is uniformly distributed during locking, single-point stress concentration is avoided, and the service life of the ball hinge is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of electronic welding auxiliary technology, specifically a multi-angle adjustable circuit board welding device. Background Technology

[0002] In the field of electronics manufacturing and repair, circuit board soldering is a fundamental and crucial process. During soldering, the method of fixing the circuit board and the angle adjustment directly affect the soldering quality, operational efficiency, and the labor intensity of the operators. Traditional circuit board soldering fixtures typically use a structure with a flat base and elastic clamping arms, which can only achieve single-axis rotation or fixed angle adjustment, and cannot meet the needs of multi-angle operations in complex soldering scenarios.

[0003] To address the issue of multi-angle adjustment, existing technologies have developed welding fixtures employing ball joint structures. For example, CN224445737U discloses a multi-degree-of-freedom adjustable metal processing positioning fixture that uses an electric push rod to drive a small ball around a rotating sphere for multi-directional fixation; some commercial products use universal damping ball joints, achieving arbitrary angle suspension through spring damping components and ball bearing slots. However, these solutions still have significant drawbacks in practical applications: First, although the ball joint structure can achieve multi-axis continuous adjustment, its locking mechanism mostly relies on external friction or spring preload. The locking force is limited and easily decays. After welding vibration or long-term use, the ball joint is prone to loosening and angular displacement, resulting in a decrease in positioning accuracy and affecting welding quality. Secondly, existing ball joint locking mechanisms mostly use external knobs or bolts to directly press the ball head. This structure has the problem of stress concentration. Long-term repeated adjustment can easily cause wear on the ball surface and reduce service life. At the same time, the external pressing method cannot ensure that the force is evenly distributed on the ball surface, resulting in a small gap still existing in the ball joint after locking, which cannot meet the positioning requirements of precision welding. Secondly, some solutions use worm gears or rack and pinion structures to achieve angle adjustment and self-locking. Although the locking reliability is good, it can only achieve single-axis rotation, which limits the degree of freedom and makes it impossible to flexibly adjust the circuit board posture in three-dimensional space. For complex solder joint positions that require simultaneous adjustment of multiple angles, the operation is cumbersome and inefficient.

[0004] Therefore, how to achieve reliable, uniform, and durable stepless locking while ensuring the flexibility of multi-axis continuous adjustment is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the problem mentioned in the background art that the existing technology cannot guarantee the flexibility of multi-axis continuous adjustment while achieving reliable, uniform, and durable stepless locking, the present invention provides a multi-angle adjustable circuit board welding device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-angle adjustable circuit board welding device, comprising: A support mechanism, comprising a base and a bracket, wherein the bracket is fixedly mounted on top of the base; A limiting mechanism is provided on the support mechanism; A ball joint head, wherein the ball joint head is disposed within a limiting mechanism, and a circular hole is provided at the bottom of the ball joint head; A clamping mechanism is disposed above the ball joint head; And a locking mechanism, which is disposed inside the ball joint head, including a rotating seat, a connecting assembly, a ball block, multiple sets of piston assemblies and multiple sets of limiting assemblies. The ball block is hemispherical and fits the inner surface of the ball joint head. The multiple sets of piston assemblies are disposed inside the ball block, and the multiple sets of limiting assemblies are arranged in a ring at the bottom of the ball block. Rotating the rotating seat causes the connecting assembly to move downwards, squeezing the ball block to press against the inner surface of the ball joint head to achieve primary locking. At the same time, the piston assembly compresses the internal space of the ball block, driving the limiting assembly to move downwards to achieve secondary locking.

[0007] Preferably, the connecting assembly includes a threaded rod, a limiting plate, a connecting rod, and a connecting plate fixedly connected in sequence. The rotating seat is threadedly connected to the threaded rod. The piston assembly includes a piston cylinder and a piston rod. The piston cylinder is fixed inside the ball block and communicates with the inside of the ball block. The piston rod is fixedly installed at the bottom of the connecting plate and slidably disposed inside the piston cylinder. Each set of limiting assemblies includes a limiting rod, a spring, and a limiting block. The limiting rod is vertically inserted through the bottom of the ball block and is slidably connected to the ball block in a sealed manner. The spring is sleeved on the surface of the limiting rod and located inside the ball block. The limiting block is connected to the bottom of the limiting rod.

[0008] Preferably, the clamping mechanism includes a positioning seat, an adjusting screw, two sliding blocks, and two clamping blocks. The positioning seat is fixedly disposed above the ball joint head. The adjusting screw is rotatably disposed within the positioning seat. The two sliding blocks are symmetrically slidably disposed within the positioning seat and are both threadedly connected to the adjusting screw. The two clamping blocks are rotatably connected to the two sliding blocks respectively. The adjusting screw is provided with two sections of threads with opposite directions of rotation. When the adjusting screw is rotated, the two sliding blocks move synchronously towards or away from each other.

[0009] Preferably, the limiting mechanism includes a first seat, a second seat, and a ball sleeve. The first seat is fixedly installed on the top of the base, the second seat is fixedly installed on the top of the bracket, and the ball sleeve is fixedly installed on the top of the second seat. The first seat, the second seat, and the ball sleeve are coaxially arranged, and the second seat is slidably connected to the limiting plate.

[0010] Preferably, the limiting components are provided in multiple sets and are distributed in annular circles on the bottom of the ball block, covering the area where the bottom circular hole of the ball hinge head coincides with the ball block. After the limiting rod moves down, it is located inside the circular hole of the ball block, and mechanical locking is achieved by the limiting rod contacting the side wall of the circular hole.

[0011] Preferably, the limiting block is circular in the vertical direction, and the bottom surface of the limiting block has the same curvature as the outer surface of the ball. When the limiting rod retracts into the ball, the bottom of the limiting block and the outer surface of the ball form a hemispherical coplanar shape.

[0012] Preferably, the piston cylinder is fixed inside the ball block, and the piston cylinder communicates with the inside of the ball block to form a sealed cavity. When the piston rod moves upward, the volume of the sealed cavity increases, creating a negative pressure. The negative pressure and the elastic force of the spring work together to drive the limiting rod to move into the ball block.

[0013] Preferably, the ball block is hemispherical, and the outer surface of the ball block is adapted to the inner surface of the ball joint head. When the connecting plate squeezes the ball block, the ball block evenly presses against the inner surface of the ball joint head, thereby achieving multi-point uniform locking of the ball joint head.

[0014] Preferably, the connecting plate is fixedly connected to the limiting plate via a connecting rod, and the piston rod is fixedly installed at the bottom of the connecting plate.

[0015] Preferably, a wear-resistant coating is provided between the ball joint head and the ball sleeve, and a grease layer is provided between the ball block and the inner surface of the ball joint head.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention achieves primary locking through ball block compression and secondary locking through the insertion of a limiting rod into a circular hole. This dual locking mechanism ensures that the ball joint head will not loosen during welding, and the locking force is uniform and stable, effectively solving the problem of insufficient locking force in existing ball joints. The hemispherical ball block fits against the inner surface of the ball joint head, and multiple limiting components are distributed in a ring at the bottom of the ball block. During locking, the force is evenly distributed, avoiding stress concentration at a single point and extending the service life of the ball joint.

[0017] This invention utilizes the sealed negative pressure chamber created inside the ball block as the piston rod moves upward, combined with spring force to achieve smooth reset of the limiting rod. The unlocking process is smooth, requiring no additional operation and improving ease of use. The bottom surface of the limiting block has the same curvature as the outer surface of the ball block, forming a hemispherical coplanar shape after retraction. After unlocking, the outer surface of the ball joint head is smooth, without affecting the smoothness of multi-angle adjustment.

[0018] This invention achieves multi-angle adjustment in three-dimensional space through ball joint connection, which can flexibly adjust the posture of the circuit board, adapt to the welding requirements of complex solder joint positions, and greatly improve work efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the structure of the present invention; Figure 3 This is a partial structural cross-sectional view of the present invention; Figure 4 This is a structural separation diagram of the first and second seat cylinders of the present invention; Figure 5 This is a cross-sectional view of the ball joint head of the present invention; Figure 6 This is a cross-sectional view of the sphere structure of the present invention; Figure 7 This is a detailed structural diagram of the piston assembly of the present invention; Figure 8 This is a detailed structural diagram of the clamping mechanism of the present invention.

[0020] In the diagram: 100, Support mechanism; 110, Base; 120, Bracket; 200, Limiting mechanism; 210, First seat cylinder; 220, Second seat cylinder; 230, Ball sleeve; 300, Ball joint head; 400, Locking mechanism; 410, Rotary seat; 420, Connecting assembly; 421, Threaded rod; 422, Limiting plate; 423, Connecting rod; 424, Connecting plate; 430, Ball block; 440, Piston assembly; 441, Piston rod; 442, Piston cylinder; 450, Limiting assembly; 451, Limiting rod; 452, Spring; 453, Limiting block; 500, Clamping mechanism; 510, Positioning seat; 520, Adjusting screw; 530, Sliding block; 540, Clamping block. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 8 As shown, the present invention provides a multi-angle adjustable circuit board welding device, including a support mechanism 100, a limiting mechanism 200, a ball joint head 300, a locking mechanism 400, and a clamping mechanism 500. The support mechanism 100 includes a base 110 and a bracket 120, with the bracket 120 fixedly installed above the base 110; The limiting mechanism 200 is mounted on the support mechanism 100 and includes a first seat 210, a second seat 220, and a ball sleeve 230. The first seat 210 is fixedly mounted on the top of the base 110, the second seat 220 is fixedly mounted on the top of the bracket 120, and the ball sleeve 230 is fixedly mounted on the top of the second seat 220. The first seat 210, the second seat 220, and the ball sleeve 230 are coaxially arranged, and the second seat 220 is slidably connected to the limiting plate 422. The ball joint head 300 is disposed within the limiting mechanism 200. A circular hole is provided at the bottom of the ball joint head 300. The circular hole is a single large hole, and its projection in the vertical direction is the same as the overall outer contour composed of multiple sets of limiting components 450. A wear-resistant coating is provided between the ball joint head 300 and the ball sleeve 230. The clamping mechanism 500 is located above the ball joint head 300 and includes a positioning seat 510, an adjusting screw 520, two sliding blocks 530, and two clamping blocks 540. The positioning seat 510 is fixedly located above the ball joint head 300, and the adjusting screw 520 is rotatably located within the positioning seat 510. The adjusting screw 520 has two threads with opposite directions of rotation, and the two threads respectively engage with the two sliding blocks 530. The two sliding blocks 530 are symmetrically slidably located within the positioning seat 510, and the two clamping blocks 540 are rotatably connected to the two sliding blocks 530 respectively. When the adjusting screw 520 is rotated, the two sliding blocks 530 move synchronously towards or away from each other, causing the two clamping blocks 540 to clamp or release the circuit board. The above solution is adopted: two sliding blocks 530 are driven to move synchronously by two sections of threads with opposite directions to achieve automatic centering and clamping.

[0023] like Figure 3 , Figure 5 and Figure 7 As shown, the locking mechanism 400 is disposed within the ball joint head 300 and includes a rotating seat 410, a connecting assembly 420, a ball block 430, multiple sets of piston assemblies 440, and multiple sets of limiting assemblies 450; the connecting assembly 420 includes a threaded rod 421, a limiting plate 422, a connecting rod 423, and a connecting plate 424 that are fixedly connected in sequence; the rotating seat 410 is threadedly connected to the threaded rod 421.

[0024] Using the above scheme: by rotating the rotating seat 410, the threaded rod 421 converts the rotational motion into axial linear motion through the threaded pair, which drives the limiting plate 422, the connecting rod 423 and the connecting plate 424 to move down or up synchronously.

[0025] like Figure 5 As shown, the ball block 430 is hemispherical, and the outer surface of the ball block 430 is adapted to the inner surface of the ball joint head 300; a grease layer is provided between the ball block 430 and the inner surface of the ball joint head 300.

[0026] The above solution is adopted because the hemispherical outer surface is adapted to the inner surface of the ball joint 300, resulting in a large contact area during locking and a uniform distribution of locking force along the spherical surface; the grease layer reduces friction, ensuring smooth angle adjustment and avoiding dry friction damage.

[0027] like Figure 7 As shown, the piston assembly 440 includes a piston cylinder 442 and a piston rod 441; the piston cylinder 442 is fixed inside the ball block 430 and communicates with the inside of the ball block 430 to form a sealed cavity; the piston rod 441 is fixedly installed at the bottom of the connecting plate 424 and slidably disposed inside the piston cylinder 442.

[0028] The above scheme is adopted: the piston rod 441 moves synchronously by the up and down movement of the connecting plate 424. When the piston rod 441 moves down, it compresses the sealed cavity and reduces the volume of the cavity. When the piston rod 441 moves up, the volume of the sealed cavity increases and forms a negative pressure, thereby realizing the linkage between the piston assembly 440 and the connecting assembly 420.

[0029] like Figure 6 As shown, multiple sets of limiting components 450 are circumferentially distributed on the bottom of the ball block 430, covering the area where the bottom circular hole of the ball joint head 300 coincides with the ball block 430. Each set of limiting components 450 includes a limiting rod 451, a spring 452, and a limiting block 453. The limiting rod 451 is vertically inserted through the bottom of the ball block 430 and is slidably connected to the ball block 430. The spring 452 is sleeved on the surface of the limiting rod 451 and located inside the ball block 430. The limiting block 453 is connected to the bottom of the limiting rod 451. The limiting block 453 is circular in the vertical direction, and the bottom surface of the limiting block 453 has the same curvature as the outer surface of the ball block 430. When the limiting rod 451 retracts into the ball block 430, the bottom of the limiting block 453 and the outer surface of the ball block 430 form a hemispherical coplanar shape.

[0030] The above solution is adopted: the airtightness of the sealed cavity is ensured by the sealed sliding connection, so that the piston rod 441 can effectively form negative pressure when it moves; the elastic restoring force is provided by the spring 452; and the bottom surface of the limiting block 453 has the same curvature as the outer surface of the ball block 430, so that the outer surface of the ball block 430 remains smooth after unlocking, without hindering the angle adjustment of the ball joint head 300.

[0031] like Figure 6 As shown, after the limiting rod 451 moves down, it is located inside the circular hole of the ball block 430. Mechanical locking is achieved by the limiting rod 451 contacting the side wall of the circular hole. The connecting plate 424 is fixedly connected to the limiting plate 422 through the connecting rod 423. The piston rod 441 is fixedly installed at the bottom of the connecting plate 424. When the piston rod 441 moves up, the volume of the sealed cavity increases, forming a negative pressure. The negative pressure and the elastic force of the spring 452 work together to drive the limiting rod 451 to move into the ball block 430.

[0032] The above scheme employs the following methods: multiple sets of limiting rods 451 simultaneously contact the sidewall of the circular hole, resulting in high locking strength and uniform force distribution; the connecting plate 424 drives the piston rod 441 to move synchronously, achieving linkage between the piston assembly 440 and the connecting assembly 420; the negative pressure and the elastic force of the spring 452 work together to achieve automatic reset of the limiting rods 451; rotating the rotating seat 410 drives the connecting assembly 420 to move downward, and the connecting plate 424 squeezes the ball block 430, which uniformly presses the inner surface of the ball joint head 300, achieving multi-point uniform locking of the ball joint head 300, which is the first-level locking; at the same time, the piston rod 441 moves downward with the connecting plate 424, compressing the sealed cavity inside the ball block 430, pushing the limiting rod 451 downward, and the limiting rod 451 is located inside the circular hole of the ball block 430, achieving secondary locking through contact with the sidewall of the circular hole. When the rotating seat 410 is rotated in the opposite direction, the connecting plate 424 disengages from the ball block 430, and the piston rod 441 moves upward, increasing the volume of the sealed cavity and creating negative pressure. The negative pressure and the elastic force of the spring 452 work together to drive the limiting rod 451 to retract into the ball block 430. The bottom surface of the limiting block 453 and the outer surface of the ball block 430 form a hemispherical coplanar shape, and the unlocking is completed, and the angle can be readjusted.

[0033] Working principle and usage process of this invention: I. Circuit Board Clamping Place the circuit board between the two clamping blocks 540, rotate the adjusting screw 520, and the two threads with opposite directions drive the two sliding blocks 530 to move synchronously towards each other, thereby causing the two clamping blocks 540 to clamp the circuit board and complete the fixation.

[0034] II. Angle Adjustment and Locking When the locking mechanism 400 is in the released state, the ball joint head 300 can rotate freely within the limiting mechanism 200 to achieve multi-angle adjustment in three-dimensional space. After adjustment, the rotating seat 410 is rotated, the connecting assembly 420 moves down as a whole, and the connecting plate 424 presses the ball block 430 to achieve primary locking. At the same time, the piston rod 441 moves down to drive the limiting rod 451 to be located inside the round hole of the ball block 430 to achieve secondary locking. The double locking ensures angle stability during welding.

[0035] III. Unlocking and Readjustment When readjustment is required, rotate the rotating seat 410 in the opposite direction, the connecting assembly 420 moves upward as a whole, the ball block 430 is no longer squeezed, the piston rod 441 moves upward and through the negative pressure and the elastic force of the spring 452, it drives the limit rod 451 to retract, the limit block 453 and the outer surface of the ball block 430 form a hemispherical coplanar shape, the unlocking is completed, and the angle can be readjusted.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-angle adjustable circuit board welding device, characterized in that, include: A support mechanism (100) includes a base (110) and a bracket (120), the bracket (120) being fixedly installed above the base (110); A limiting mechanism (200) is provided on the support mechanism (100); A ball joint (300) is disposed within a limiting mechanism (200), and a circular hole is provided at the bottom of the ball joint (300); A clamping mechanism (500) is disposed above the ball joint head (300); And a locking mechanism (400), which is disposed inside the ball joint head (300), including a rotating seat (410), a connecting assembly (420), a ball block (430), multiple sets of piston assemblies (440) and multiple sets of limiting assemblies (450). The ball block (430) is hemispherical and fits the inner surface of the ball joint head (300). The multiple sets of piston assemblies (440) are disposed inside the ball block (430), and the multiple sets of limiting assemblies (450) are arranged in a ring at the bottom of the ball block (430). Rotating the rotating seat (410) causes the connecting assembly (420) to move downward, and the squeeze ball block (430) presses against the inner surface of the ball joint head (300) to achieve primary locking. At the same time, the piston assembly (440) compresses the internal space of the ball block (430) and drives the limiting assembly (450) to move downward to achieve secondary locking.

2. The multi-angle adjustable circuit board welding device according to claim 1, characterized in that: The connecting assembly (420) includes a threaded rod (421), a limiting plate (422), a connecting rod (423), and a connecting plate (424) that are fixedly connected in sequence. The rotating seat (410) is threadedly connected to the threaded rod (421). The piston assembly (440) includes a piston cylinder (442) and a piston rod (441). The piston cylinder (442) is fixed inside the ball block (430) and communicates with the inside of the ball block (430). The piston rod (441) is fixedly installed on the bottom of the connecting plate (424). Each of the limiting components (450) is slidably disposed inside the piston cylinder (442). Each limiting component (450) includes a limiting rod (451), a spring (452), and a limiting block (453). The limiting rod (451) is vertically disposed through the bottom of the ball block (430). The limiting rod (451) is slidably connected to the ball block (430). The spring (452) is sleeved on the surface of the limiting rod (451) and located inside the ball block (430). The limiting block (453) is connected to the bottom of the limiting rod (451).

3. The multi-angle adjustable circuit board welding device according to claim 2, characterized in that: The clamping mechanism (500) includes a positioning seat (510), an adjusting screw (520), two sliding blocks (530), and two clamping blocks (540). The positioning seat (510) is fixedly disposed above the ball joint head (300). The adjusting screw (520) is rotatably disposed within the positioning seat (510). The two sliding blocks (530) are symmetrically slidably disposed within the positioning seat (510) and are threadedly connected to the adjusting screw (520). The two clamping blocks (540) are rotatably connected to the two sliding blocks (530) respectively. The adjusting screw (520) is provided with two sections of threads with opposite directions of rotation. When the adjusting screw (520) is rotated, the two sliding blocks (530) move synchronously towards or away from each other.

4. The multi-angle adjustable circuit board welding device according to claim 2, characterized in that: The limiting mechanism (200) includes a first seat (210), a second seat (220), and a ball sleeve (230). The first seat (210) is fixedly installed on the top of the base (110), the second seat (220) is fixedly installed on the top of the bracket (120), and the ball sleeve (230) is fixedly installed on the top of the second seat (220). The first seat (210), the second seat (220), and the ball sleeve (230) are coaxially arranged, and the second seat (220) is slidably connected to the limiting plate (422).

5. The multi-angle adjustable circuit board welding device according to claim 2, characterized in that: The limiting component (450) is provided in multiple sets and is distributed in a ring around the bottom of the ball block (430), covering the area where the bottom circular hole of the ball hinge head (300) coincides with the ball block (430). After the limiting rod (451) moves down, it is located inside the circular hole of the ball block (430). Mechanical locking is achieved by the limiting rod (451) contacting the side wall of the circular hole.

6. The multi-angle adjustable circuit board welding device according to claim 2, characterized in that: The limiting block (453) is circular in the vertical direction, and the bottom surface of the limiting block (453) has the same curvature as the outer surface of the ball block (430). When the limiting rod (451) retracts into the ball block (430), the bottom of the limiting block (453) and the outer surface of the ball block (430) form a hemispherical coplanar shape.

7. The multi-angle adjustable circuit board welding device according to claim 2, characterized in that: The piston cylinder (442) is fixed inside the ball block (430). The piston cylinder (442) and the ball block (430) are connected to form a sealed cavity. When the piston rod (441) moves upward, the volume of the sealed cavity increases and a negative pressure is formed. The negative pressure and the elastic force of the spring (452) work together to drive the limiting rod (451) to move into the ball block (430).

8. The multi-angle adjustable circuit board welding device according to claim 2, characterized in that: The ball block (430) is hemispherical, and the outer surface of the ball block (430) is adapted to the inner surface of the ball joint head (300). When the connecting plate (424) squeezes the ball block (430), the ball block (430) presses the inner surface of the ball joint head (300) evenly, thereby achieving multi-point uniform locking of the ball joint head (300).

9. The multi-angle adjustable circuit board welding device according to claim 2, characterized in that: The connecting plate (424) is fixedly connected to the limiting plate (422) via the connecting rod (423), and the piston rod (441) is fixedly installed at the bottom of the connecting plate (424).

10. The multi-angle adjustable circuit board welding device according to claim 4, characterized in that: A wear-resistant coating is provided between the ball joint head (300) and the ball sleeve (230), and a grease layer is provided between the ball block (430) and the inner surface of the ball joint head (300).

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