High-precision spherical hinge for self-locking working condition

Abstract

The utility model discloses a kind of high-precision ball hinge for self-locking working condition, and specific implementation scheme is: including ball hinge, locking ring, base and top cover, the top cover is set in the top of the base, a containing space is formed between the top cover and the base, the ball head of the ball hinge and the locking ring are set in the containing space;The locking ring is provided with containing groove, the ball head portion of the ball hinge is embedded in the containing groove, the containing groove and the ball head portion of ball hinge adopt clearance fit, the rod portion of the ball hinge passes the top cover.The utility model introduces locking ring, realizes the locking and release of ball hinge kinematic pair.In motion state, locking ring is in release mode, ensure that the ball head portion of ball hinge and containing groove maintain the low friction, clearance-free kinematic pair formed by precision fit, and movement process is smooth and smooth.When need to fix pose, locking ring is accurately triggered, and applies uniform controllable constraint force, realizes reliable self-locking.

Description

Technical Field

[0001] This utility model relates to the field of ball joint technology, and in particular to a high-precision ball joint for self-locking applications. Background Technology

[0002] In the field of precision motion control, ball joints, as the core kinematic pair of multi-degree-of-freedom mechanisms, directly affect the system's positioning accuracy, dynamic response, and anti-interference capability. Traditional sliding ball joints achieve three-degree-of-freedom rotation through the tight fit between the ball head and the socket, but there is a contradiction between friction and clearance. Excessive tightness leads to increased sliding friction, while excessive looseness introduces micron-level clearance errors, both of which reduce motion accuracy. Utility Model Content

[0003] Based on this, in order to solve the problem of friction and clearance contradiction in existing ball joints, this utility model provides a high-precision ball joint for self-locking conditions.

[0004] This utility model provides a high-precision ball joint for self-locking operation, comprising: a ball joint, a locking ring, a base, and a top cover. The top cover is disposed on top of the base, and a receiving space is formed between the top cover and the base. The ball head of the ball joint and the locking ring are disposed within the receiving space. The locking ring is provided with a receiving groove, and the ball head portion of the ball joint is embedded in the receiving groove. The receiving groove and the ball head portion of the ball joint are in clearance fit, and the rod portion of the ball joint passes through the top cover.

[0005] The locking ring is a radially open ring.

[0006] Axially protruding lugs are formed at both ends of the locking ring along the radial direction.

[0007] The lug has a first threaded hole in the middle.

[0008] The adjusting bolt is threadedly connected to the first threaded hole.

[0009] The spherical cap has several second threaded holes in its circumferential direction.

[0010] The base has several third threaded holes in its circumferential direction.

[0011] The connecting bolt passes through the second threaded hole and the third threaded hole.

[0012] The base is provided with a slot for fixing the locking ring, and the base and the locking ring are interference-fitted.

[0013] Beneficial effects: This invention introduces an actively controllable locking ring, realizing the locking and releasing of the ball joint kinematic pair. In motion, the locking ring is in the released mode, ensuring a low-friction, backlash-free kinematic pair formed by the precise fit between the ball head and the receiving groove. This fully inherits and guarantees the motion freedom and positioning accuracy of traditional high-precision ball joints, while ensuring smooth and stable movement. When a fixed posture is required, the locking ring is precisely triggered, applying a uniform and controllable constraint force to achieve reliable self-locking, effectively resisting external load interference and maintaining posture stability.

[0014] This invention successfully separates the traditionally conflicting requirements of "low-friction movement" and "gapless locking" through a dynamic mechanism of "releasing during movement and clamping during locking," achieving a unity between the two.

[0015] In motion mode, the excessive preload that must be applied to eliminate gaps is avoided, which significantly reduces sliding friction resistance, not only reducing wear but also ensuring high precision and ultra-smoothness in the motion process.

[0016] The locking ring's motion control is relatively simple and direct, requiring no complex state switching algorithms or high-precision real-time trajectory coordination, which significantly reduces the system's control complexity and improves reliability and response speed.

[0017] The ball joint structure proposed in this invention can be applied to a six-degree-of-freedom parallel mechanism. When the moving platform moves to the target position, the attitude is reliably locked through the self-locking function of the ball joint.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0019] The accompanying drawings are provided for a better understanding of this solution and do not constitute a limitation on this utility model. Wherein:

[0020] Figure 1 This is a schematic diagram of the overall structure provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the locking ring and base structure provided by this utility model;

[0022] Figure 3 This is a cross-sectional schematic diagram of the overall structure provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the locking ring structure provided by this utility model. Detailed Implementation

[0024] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These embodiments should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0025] like Figures 1 to 4 As shown, this utility model provides a high-precision ball joint 1 for self-locking operation, including: ball joint 1, locking ring 2, base 4 and top cover. The top cover is disposed on the top of the base 4, and a receiving space is formed between the top cover and the base 4. The ball head of the ball joint 1 and the locking ring 2 are disposed in the receiving space. The locking ring 2 is provided with a receiving groove 8. The ball head of the ball joint 1 is embedded in the receiving groove 8. The receiving groove 8 and the ball head of the ball joint 1 are clearance-fitted. The rod of the ball joint 1 passes through the top cover.

[0026] This invention introduces an actively controllable locking ring 2, which realizes the locking and releasing of the ball joint 1 kinematic pair. In motion, the locking ring 2 is in the released mode, ensuring that the ball head part of the ball joint 1 and the receiving groove 8 maintain a low-friction, zero-backlash kinematic pair formed by precise fit, thus fully inheriting and guaranteeing the motion freedom and positioning accuracy of the traditional high-precision ball joint 1, and the motion process is smooth and stable.

[0027] When a fixed position is required, the locking ring 2 is precisely triggered, applying a uniform and controllable constraint force to achieve reliable self-locking, effectively resisting external load interference and maintaining stable posture.

[0028] The receiving groove 8 and the spherical surface of the ball head are fitted with a clearance to facilitate relative sliding of the spherical surface of the ball head.

[0029] The receiving groove 8 and the spherical surface of the ball head are fitted with a clearance, which creates a low-friction, unhindered free rotation interface in motion mode. At the same time, it reserves controllable deformation space for the self-locking action of the locking ring 2, and finally achieves a dynamic balance between "unhindered movement" and "zero displacement locking".

[0030] The locking ring 2 is a radially open ring.

[0031] The locking ring 2 is designed with a radial opening, which allows for adjustment of the inner diameter of the receiving groove 8, thereby clamping the ball head of the ball joint 1. In motion, the locking ring 2 is in the release mode, ensuring that the ball head of the ball joint 1 and the receiving groove 8 maintain a low-friction, backlash-free kinematic pair formed by a precise fit. When a fixed position is required, the locking ring 2 is precisely triggered, applying a uniform and controllable constraint force to achieve reliable self-locking and maintain posture stability.

[0032] Axially protruding lugs 5 are formed at both ends of the locking ring 2 in a radial direction.

[0033] Axially protruding lugs 5 are designed at both ends of the locking ring 2 to efficiently convert the linear driving force of the clamping mechanism into the radial contraction deformation of the locking ring 2, while realizing the precise control and uniform distribution of the self-locking force of the locking ring 2.

[0034] The lug 5 has a first threaded hole 6 in the middle.

[0035] The design of the lug 5 allows the inner diameter of the locking ring 2 to change, thereby enabling the locking ring 2 to release and self-lock the ball head of the ball joint 1. In motion, the locking ring 2 is in the release mode, ensuring that the ball head of the ball joint 1 and the receiving groove 8 maintain a low-friction, backlash-free kinematic pair formed by precise fit. When a fixed position is required, the locking ring 2 is precisely triggered to apply a uniform and controllable constraint force, achieving reliable self-locking and maintaining posture stability.

[0036] The adjusting bolt 9 is threadedly connected to the first threaded hole 6.

[0037] The locking ring 2 is tightened by adjusting the bolt 9, which increases the friction between the ball head of the ball joint 1 and the locking ring 2, thereby achieving a self-locking effect.

[0038] The spherical cover 3 has several second threaded holes 10 arranged in the circumferential direction.

[0039] The base 4 has several third threaded holes 11 arranged in the circumferential direction.

[0040] The number of second threaded holes 10 and third threaded holes 11 is the same. The ball cover 3 and the base 4 can be assembled by passing the connecting bolts through the second threaded holes 10 and the third threaded holes 11.

[0041] The connecting bolt passes through the second threaded hole 10 and the third threaded hole 11.

[0042] The ball cover 3 and the base 4 are connected by bolts. The connecting bolts are threaded into the second threaded hole 10 and the third threaded hole 11 to realize the assembly of the ball cover 3 and the base 4.

[0043] The base 4 is provided with a slot for fixing the locking ring 2, and the base 4 and the locking ring 2 are interference-fitted.

[0044] The base 4 and the locking ring 2 are fitted with an interference fit. This interference fit creates a continuously pressing physical contact surface between the locking ring 2 and the base 4 after assembly, eliminating micron-level assembly gaps and preventing the clamping force from being absorbed and attenuated during self-locking. This ensures that the constraint force is transmitted to the contact surface of the receiving groove 8. Under vibration or alternating load conditions, the static friction generated by the interference fit can suppress micro-slippage at the interface between the locking ring 2 and the base 4, preventing positional drift caused by micro-slippage in the self-locking state and ensuring long-term posture stability. The interference fit also ensures that the ball head of the ball joint 1 is subjected to uniform force when locked, avoiding asymmetrical shrinkage and deformation of the receiving groove 8 due to localized stress concentration.

[0045] This invention successfully separates the traditionally conflicting requirements of "low-friction movement" and "gapless locking" through a dynamic mechanism of "releasing during movement and clamping during locking," achieving a unity between the two.

[0046] In motion mode, the excessive preload that must be applied to eliminate gaps is avoided, which significantly reduces sliding friction resistance, not only reducing wear but also ensuring high precision and ultra-smoothness in the motion process.

[0047] The motion control of the locking ring 2 is relatively simple and direct, without the need for complex state switching algorithms or high-precision real-time trajectory coordination, which significantly reduces the control complexity of the system and improves reliability and response speed.

[0048] The ball joint 1 structure proposed in this utility model can be applied to a six-degree-of-freedom parallel mechanism. When the moving platform moves to the target position, the attitude is reliably locked through the self-locking function of the ball joint 1.

[0049] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A high-precision ball joint for self-locking applications, characterized in that, include: The ball joint, locking ring, base, and ball cap are provided, wherein the ball cap is disposed on the top of the base, and a receiving space is formed between the ball cap and the base, and the ball head of the ball joint and the locking ring are disposed within the receiving space; The locking ring is provided with a receiving groove, and the ball head portion of the ball joint is embedded in the receiving groove. The receiving groove and the ball head portion of the ball joint are in clearance fit, and the rod portion of the ball joint passes through the ball cap.

2. A high-precision ball joint for self-locking operation according to claim 1, characterized in that: The locking ring is a radially open ring.

3. A high-precision ball joint for self-locking operation according to claim 2, characterized in that: Axially protruding lugs are formed at both ends of the locking ring along the radial direction.

4. A high-precision ball joint for self-locking operation according to claim 3, characterized in that: The lug has a first threaded hole in the middle.

5. A high-precision ball joint for self-locking operation according to claim 4, characterized in that: The adjusting bolt is threadedly connected to the first threaded hole.

6. A high-precision ball joint for self-locking operation according to claim 1 or 5, characterized in that: The spherical cap has several second threaded holes in its circumferential direction.

7. A high-precision ball joint for self-locking operation according to claim 6, characterized in that: The base has several third threaded holes in its circumferential direction.

8. A high-precision ball joint for self-locking operation according to claim 7, characterized in that: The connecting bolt passes through the second threaded hole and the third threaded hole.

9. A high-precision ball joint for self-locking operation according to claim 1, characterized in that: The base is provided with a slot for fixing the locking ring, and the base and the locking ring are interference-fitted.

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