Ball joint for supporting a six-degree-of-freedom platform
By designing a combination structure of a dustproof rubber sleeve and an I-shaped retaining sleeve in the ball joint, the problem of dust entering due to the slippage of the dust cover was solved, the sealing and stability of the ball cavity were achieved, the risk of wear was reduced, and the normal operation of the six-degree-of-freedom platform was ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XUZHOU YUSHAN ELECTRONIC TECHNOLOGY CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-05-26
AI Technical Summary
When the ball joint of the existing six-degree-of-freedom platform contacts the ball rod at the inner edge of the dust cover opening, external dust and contaminants enter the ball cavity, affecting normal operation.
The inner edge of the dustproof rubber sleeve is inserted into the I-shaped retaining sleeve, and the screw locking sleeve moves up and down in the vertical direction of the cue until the screw locking sleeve presses the dustproof rubber sleeve into the I-shaped retaining sleeve, forming a stable sealing environment to prevent slippage and wear.
It effectively prevents external substances from seeping in, keeps the inside of the ball cavity clean and dry, reduces the risk of malfunction, and ensures the normal operation of the cue and ball head.
Smart Images
Figure CN224283205U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ball joint technology, specifically to ball joints for supporting six-degree-of-freedom platforms. Background Technology
[0002] A six-degree-of-freedom (6DOF) platform is a widely used device in fields such as virtual reality, flight simulation, and robot control. Its core function is to simulate the complex motion of objects in three-dimensional space. To achieve this, the effective connection of drive devices such as hydraulic cylinders and servo motors is crucial, and ball joints play a vital role in this process. Ball joints are mainly used to connect the chassis of the six-DOF platform to the bottom of the hydraulic cylinders, providing motion compensation. By allowing the connecting components to rotate freely in multiple directions, ball joints not only enhance the platform's motion flexibility but also effectively reduce motion errors caused by load changes and external impacts, ensuring the platform's stability during movement. This type of structure... It mainly consists of a ball, a support base, a shell, and a lubrication system. The ball, as the core part, rotates freely within the support base and can move on multiple axes, thereby effectively transmitting the drive of the hydraulic cylinder. In addition, the shell provides protection for the ball and the support base, while the lubrication system ensures good lubrication during operation and reduces wear. At present, ball joints are equipped with a rubber dust cover for dust and seepage prevention on the top of the shell. At this time, the inner edge of the opening of the rubber dust cover is in contact with the ball rod. During the movement of the ball rod and ball head, the inner edge of the opening of the rubber dust cover will repeatedly slide on the ball rod, which will still pull external dust and contaminated grease into the ball cavity of the shell, thus affecting the normal operation of the ball joint. Utility Model Content
[0003] The purpose of this invention is to provide a ball joint for supporting a six-degree-of-freedom platform. The inner edge of the dustproof rubber sleeve is inserted into the I-shaped retaining sleeve, and the threaded locking sleeve moves up and down in the vertical direction of the ball rod until the threaded locking sleeve presses the dustproof rubber sleeve tightly into the I-shaped retaining sleeve. This prevents the dustproof rubber sleeve from repeatedly slipping due to the movement of the ball rod and ball head, ensuring the relative sealing of the ball cavity inside the bottom shell, thereby solving the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a ball joint for supporting a six-degree-of-freedom platform, comprising a bottom shell, an inner ball head movably installed in the ball cavity inside the bottom shell, a ball rod integrally formed at the top of the inner ball head, and a threaded locking sleeve threaded onto one end of the ball rod surface. A dustproof rubber sleeve is installed at the opening position at the top of the bottom shell, and an I-shaped retaining sleeve is fixed on the outer circumference of the ball rod below the threaded locking sleeve. A groove is provided on the outer wall of the I-shaped retaining sleeve for the inner edge of the top of the dustproof rubber sleeve to be inserted.
[0005] Preferably, the left and right outer walls of the bottom shell are integrally formed with rocker seats, and a positioning bolt is installed on one side of the outer wall of the rocker seat.
[0006] Preferably, an oil injection nozzle communicating with the ball cavity is installed on one side of the bottom shell surface, and a plurality of oil grooves are provided on the inner wall of the bottom shell.
[0007] Preferably, the top of the cue stick is integrally formed with a flange.
[0008] Preferably, one end of the cue stick surface is integrally formed with a disc-shaped flange, the top end of which is fixedly connected to the bottom end of the I-shaped retainer, and the other end of the cue stick surface is provided with an external thread groove that engages with the threaded locking sleeve.
[0009] Preferably, an annular protrusion is integrally formed at the edge of the bottom end of the threaded locking sleeve, and the inner diameter of the annular protrusion is greater than or equal to the outer diameter of the I-shaped retaining sleeve.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The ball joint for supporting the six-degree-of-freedom platform is provided with a structure in which a bottom shell, an inner ball head, a ball rod, a dustproof rubber sleeve, an I-shaped retaining sleeve, and a threaded locking sleeve cooperate with each other. The inner edge of the dustproof rubber sleeve is inserted into the I-shaped retaining sleeve, and the threaded locking sleeve moves up and down in the vertical direction of the ball rod until the threaded locking sleeve presses the dustproof rubber sleeve tightly into the I-shaped retaining sleeve, so that the dustproof rubber sleeve no longer slips repeatedly due to the movement of the ball rod and the ball head, ensuring the relative sealing of the ball cavity inside the bottom shell; wherein the dustproof rubber sleeve is The threaded locking sleeve is pressed into the I-shaped retaining sleeve, forming a relatively stable sealed environment that effectively prevents the infiltration of external substances, ensuring the cleanliness and dryness of the ball cavity. The dustproof sleeve is also fixed in the I-shaped retaining sleeve, avoiding wear caused by slippage and friction. Secondly, by fixing the inner edge opening of the dustproof sleeve, it is ensured that it will not slip during movement. The dustproof sleeve itself has a certain amount of expansion and contraction allowance, ensuring that the inner ball head and the ball rod can still move normally in the ball cavity of the bottom shell, thereby reducing the risk of failure due to seal failure and excessive wear of the ball head. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the main structure of this utility model;
[0012] Figure 2 This is a side view of the structure of this utility model;
[0013] Figure 3 This is a three-dimensional structural diagram of the present invention;
[0014] Figure 4 This is a schematic diagram of the front cross-sectional structure of this utility model;
[0015] Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the middle.
[0016] In the diagram: 1. Bottom shell; 101. Oil groove; 2. Rocker seat; 3. Positioning bolt; 4. Inner ball head; 5. Ball rod; 501. Disc flange; 502. External thread groove; 6. Flange; 7. Threaded locking sleeve; 701. Annular protrusion; 8. Dustproof rubber sleeve; 9. I-shaped retaining sleeve; 901. Groove; 10. Oil nozzle. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0018] Please see Figure 1-5 An embodiment of this utility model provides a ball joint for supporting a six-degree-of-freedom platform, including a bottom shell 1, an inner ball head 4 movably installed in the ball cavity inside the bottom shell 1, a ball rod 5 integrally formed at the top of the inner ball head 4, and a threaded locking sleeve 7 threadedly installed at one end of the surface of the ball rod 5. A dustproof rubber sleeve 8 is installed at the opening position at the top of the bottom shell 1. An I-shaped retaining sleeve 9 is fixed on the outer circumference of the ball rod 5 below the threaded locking sleeve 7. A groove 901 is provided on the outer wall of the I-shaped retaining sleeve 9 for the inner edge of the top of the dustproof rubber sleeve 8 to be inserted.
[0019] The left and right outer walls of the bottom shell 1 are integrally formed with rocker seats 2, and a positioning bolt 3 is installed on one side of the outer wall of the rocker seat 2. The rocker seats 2 on the left and right outer walls of the bottom shell 1 enable the ball joint to be bolted to the chassis of the six-degree-of-freedom platform and the connection is stable.
[0020] The top of the cue stick 5 is integrally formed with a flange 6. The top of the cue stick 5 is bolted to the bottom of the external hydraulic cylinder through the flange 6, so that the cue stick is connected to the hydraulic cylinder.
[0021] A grease nipple 10 connected to the ball cavity is installed on one side of the surface of the bottom shell 1. Several oil grooves 101 are provided on the inner wall of the bottom shell 1. The operator injects lubricating oil into the ball cavity of the bottom shell 1 through the grease nipple 10. The lubricating oil is stored in the oil grooves 101 to lubricate the inner ball head 4 and reduce the friction of the inner ball head 4.
[0022] One end of the cue stick 5 has an integrally formed disc-shaped flange 501. The top of the disc-shaped flange 501 is fixedly connected to the bottom end of the I-shaped retainer 9. The other end of the cue stick 5 has an external thread groove 502 that is threaded to engage with the threaded locking sleeve 7. An annular protrusion 701 is integrally formed at the edge of the bottom end of the threaded locking sleeve 7. The inner diameter of the annular protrusion 701 is greater than or equal to the outer diameter of the I-shaped retainer 9. When the threaded locking sleeve 7 is screwed downward through the external thread groove 502 on the cue stick 5, the annular protrusion 701 at the bottom end of the threaded locking sleeve 7 moves down and applies pressure to the inner edge of the dustproof rubber sleeve 8 until the inner edge of the dustproof rubber sleeve 8 is pressed tightly onto the disc-shaped flange 501 by the annular protrusion 701. At this time, the inner edge of the dustproof rubber sleeve 8 is stably limited in the groove 901.
[0023] In this embodiment, the base shell 1 is first placed on top of the stable six-degree-of-freedom platform chassis to ensure correct installation and avoid assembly difficulties due to positional deviations. Then, according to the design drawings, the fixing hole positions of the base shell 1 are confirmed, and the rocker arm 2 is fixed to the six-degree-of-freedom platform chassis using positioning bolts 3 to prevent displacement during subsequent operations. The inner ball head 4 is pushed into the ball cavity of the base shell 1, ensuring complete embedding. At this point, the operator can use lubricating oil to lubricate the contact surface of the inner ball head 4 to reduce friction and improve movement flexibility. The inner edge of the top of the dustproof rubber sleeve 8 is aligned with the groove 901 of the I-shaped retaining sleeve 9 and gently inserted to ensure the dustproof rubber sleeve is fully inserted. The sleeve 8 is fully embedded in the I-shaped retaining sleeve 9, forming a preliminary sealing effect. Then, the threaded locking sleeve 7 is rotated clockwise until the bottom end of the threaded locking sleeve 7 is tightly engaged with the top end of the I-shaped retaining sleeve 9. The threaded locking sleeve 7 then presses the dustproof sleeve 8 into the I-shaped retaining sleeve 9, forming a good sealing effect. After all components are installed, the staff needs to conduct a comprehensive inspection to check whether the connections of each part are firm and to ensure that there is no looseness. Then, a sealing test is conducted to check whether the dustproof sleeve 8 can effectively prevent the infiltration of external substances. During the test, the dustproof sleeve 8 has a certain amount of movement, and the inner edge of the top end of the dustproof sleeve 8 is always located in the I-shaped retaining sleeve 9 and remains stationary.
[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0025] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A ball screw for a six degree of freedom stage support, characterized by: The device includes a bottom shell (1), an inner ball head (4) that is movably installed in the ball cavity inside the bottom shell (1), a ball rod (5) integrally formed at the top of the inner ball head (4), and a threaded locking sleeve (7) that is threaded at one end of the surface of the ball rod (5). A dustproof rubber sleeve (8) is installed at the opening position at the top of the bottom shell (1). An I-shaped retaining sleeve (9) is fixed on the outer circumference of the ball rod (5) below the threaded locking sleeve (7). A groove (901) is provided on the outer wall of the I-shaped retaining sleeve (9) for the inner edge of the top of the dustproof rubber sleeve (8) to be inserted.
2. The ball joint for supporting a six-degree-of-freedom platform according to claim 1, characterized in that: The bottom shell (1) has a rocker arm (2) integrally formed on both the left and right outer walls, and a positioning bolt (3) is installed on one side of the rocker arm (2).
3. The ball joint for supporting a six-degree-of-freedom platform according to claim 1, characterized in that: An oil injection nozzle (10) communicating with the ball cavity is installed on one side of the surface of the bottom shell (1), and a plurality of oil grooves (101) are provided on the inner wall of the bottom shell (1).
4. The ball joint for supporting a six-degree-of-freedom platform according to claim 1, characterized in that: The top of the cue stick (5) is integrally formed with a flange (6).
5. The ball joint for supporting a six-degree-of-freedom platform according to claim 4, characterized in that: One end of the surface of the cue stick (5) is integrally formed with a disc-shaped flange (501), the top end of the disc-shaped flange (501) is fixedly connected to the bottom end of the I-shaped retaining sleeve (9), and the other end of the surface of the cue stick (5) is provided with an external thread groove (502) that is threadedly engaged with the threaded locking sleeve (7).
6. The ball joint for supporting a six-degree-of-freedom platform according to claim 5, characterized in that: The threaded locking sleeve (7) has an annular protrusion (701) integrally formed at the edge of the bottom end, and the inner diameter of the annular protrusion (701) is greater than or equal to the outer diameter of the I-shaped retaining sleeve (9).