High-speed low-noise precision ball screw pair

Abstract

The invention relates to the technical field of ball screw pairs, and discloses a high-speed low-noise precise ball screw pair which comprises a hollow lead screw, balls are rotationally connected to the outer wall of the hollow lead screw, a nut is rotationally connected to the outer wall of the balls, inverters are arranged on the two sides of the inner wall of the nut and are in mirror image arrangement, and the inverters are arranged on the outer wall of the hollow lead screw. The outer wall of the ball is rotationally connected to the inner wall of the reverser, the outer wall of the ball is rotationally connected to the inner wall of the nut, an oil storage tank is arranged in the nut, an oil cover is arranged on the inner wall of the oil storage tank, composite fiber cloth is arranged on the inner wall of the oil storage tank, and the outer wall of the composite fiber cloth is attached to the outer wall of the ball. According to the ball screw pair, the surfaces of the balls are coated with lubricating oil by making the balls make contact with the composite fiber cloth, the friction force between the balls and the nut and the friction force between the balls and the rolling grooves are reduced through the BN-AlN composite ceramic layers, noise is reduced, meanwhile, the balls are prevented from being damaged, and the service life of the ball screw pair is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of ball screw pairs, and specifically to a high-speed, low-noise precision ball screw pair. Background Art

[0002] In the trend of modern manufacturing industry constantly pursuing high efficiency and high precision, mechanical products are striding forward towards the direction of high speed, high efficiency and automation. For typical equipment such as industrial robots, CNC machining centers and mechatronic machines, the feed drive speed continues to increase. As a core component in the precision mechanical transmission system, the performance of the ball screw pair directly affects the positioning accuracy and motion stability of the equipment.

[0003] With the continuous improvement of the requirements for processing efficiency and precision in modern industry, the working speed of the ball screw pair has been continuously increased. However, under high-speed operating conditions, the traditional ball screw pair has the problem of increased noise. Summary of the Invention Aiming at the deficiencies of the prior art, the present invention provides a high-speed, low-noise precision ball screw pair, which solves the problem that the traditional ball screw pair has increased noise under high-speed operating conditions.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A high-speed, low-noise precision ball screw pair includes a hollow screw. The outer wall of the hollow screw is rotatably connected with balls. The outer wall of the balls is rotatably connected with a nut. On both sides of the inner wall of the nut, there are reverse devices which are arranged in mirror image. The outer wall of the balls is rotatably connected to the inner wall of the reverse devices. The outer wall of the balls is rotatably connected to the inner wall of the nut. Inside the nut, there is an oil storage tank. The inner wall of the oil storage tank is provided with an oil cover. The inner wall of the oil storage tank is provided with a composite fiber cloth. The outer wall of the composite fiber cloth is attached to the outer wall of the balls.

[0005] Preferably, the reverse devices and the oil storage tank are fixed inside the nut through fixators. The balls form a circular motion inside the nut through the reverse devices on both sides.

[0006] Preferably, the composite fiber cloth is made by compounding polyester fiber and carbon fiber. The lubricating oil stored inside the oil storage tank will not drip down under the action of the composite fiber cloth.

[0007] Preferably, a limiting ring is fixedly connected to the outer wall of the nut. The inner wall of the limiting ring is rotatably connected with a toothed ring. A fixing column is fixedly connected to the outer wall of the toothed ring. The tooth end of the toothed ring is meshed with a gear. A threaded column is fixedly connected to the inner wall of the gear. A limiting column is fixedly connected to the outer wall of the threaded column. A limiting rod is fixedly connected to the inner wall of the limiting ring. A sliding ring is slidably connected to the outer wall of the limiting rod. An inner cavity is formed inside the sliding ring.

[0008] Preferably, the outer wall of the gear is rotatably connected to the inner wall of the limiting ring, and the outer wall of the threaded column is rotatably connected to the inner wall of the limiting ring.

[0009] Preferably, the inside of the sliding ring is threadedly connected to the outer wall of the threaded column, and the inner wall of the sliding ring is slidably connected to the outer wall of the limiting column.

[0010] Preferably, the outer wall of the limiting column is slidably connected to the inner wall of the inner cavity, and the outer wall of the sliding ring is slidably connected to the outer wall of the nut.

[0011] Preferably, when the sliding ring moves to one end away from or close to the limiting ring, the limiting column is in contact with the inner wall of the inner cavity at this time.

[0012] Preferably, the hollow lead screw is made of a carbon fiber composite structure, the carbon fiber composite structure includes carbon fiber and titanium alloy composite material, and the ball is made of silicon nitride ceramic.

[0013] Preferably, a BN-AlN composite ceramic layer is deposited on the surface of the rolling groove formed on the outer wall of the hollow lead screw.

[0014] The present invention provides a high-speed, low-noise precision ball screw pair. It has the following beneficial effects: 1. In the present invention, while the ball circulates between the nuts, it contacts the composite fiber cloth containing lubricating oil inside to coat the lubricating oil on the surface of the ball, and a BN-AlN composite ceramic layer is deposited through the rolling groove, reducing the friction between the ball and the rolling grooves of the nut and the hollow lead screw, reducing noise generation, preventing the ball from being damaged, and improving the service life of the ball screw pair.

[0015] 2. In the present invention, by rotating and pushing the fixed column, the fixed column drives the toothed ring to perform a circular motion, thereby driving the gear to rotate, and the gear drives the threaded column to rotate. Through the cooperation of the limiting rod, the sliding ring moves to adapt to nut seats of different specifications, improving the working efficiency.

[0016] 3. In the present invention, the hollow lead screw made of composite materials is combined with the ball made of silicon nitride ceramic. While reducing the overall weight of the lead screw, increasing the running speed, and reducing inertia, it uses the material characteristics to absorb vibration energy and reduce noise. At the same time, due to the high hardness and wear resistance of the ball, the service life is extended and the transmission efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the present invention; Figure 2 is a partial structural schematic diagram of the fixed column of the present invention; Figure 3Schematic diagram of the partial structure of the gear ring of the present invention; Figure 4 Schematic diagram of the partial structure of the gear of the present invention; Figure 5 Schematic cross-sectional view of the internal structure of the nut of the present invention; Figure 6 Schematic diagram of the partial structure of the composite fiber fabric of the present invention; Figure 7 Schematic cross-sectional view of the internal structure of the sliding ring of the present invention; Figure 8 Schematic diagram of the partial structure of the sliding ring of the present invention.

[0018] Among them, 1, hollow lead screw; 2, ball; 3, nut; 4, reverser; 5, oil storage tank; 6, oil cap; 7, composite fiber fabric; 8, limit ring; 9, gear ring; 10, fixed column; 11, gear; 12, threaded column; 13, limit rod; 14, limit column; 15, sliding ring; 16, inner cavity. Specific embodiments

[0019] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to the attached Figure 1 -attached Figure 6 , the embodiment of the present invention provides a high-speed and low-noise precision ball screw pair, including a hollow lead screw 1, the outer wall of the hollow lead screw 1 is rotatably connected with a ball 2, the outer wall of the ball 2 is rotatably connected with a nut 3, both sides of the inner wall of the nut 3 are provided with reversers 4, the reversers 4 are arranged in a mirror image, the outer wall of the ball 2 is rotatably connected to the inner wall of the reverser 4, the outer wall of the ball 2 is rotatably connected to the inner wall of the nut 3, an oil storage tank 5 is arranged inside the nut 3, an oil cap 6 is arranged on the inner wall of the oil storage tank 5, a composite fiber fabric 7 is arranged on the inner wall of the oil storage tank 5, and the outer wall of the composite fiber fabric 7 is attached to the outer wall of the ball 2.

[0021] Specifically, the hollow lead screw 1 is driven to rotate by the motor base. At this time, the ball 2 rotates on the inner wall of the rolling groove formed on the outer wall of the hollow lead screw 1. Through the action of the thread groove, the ball 2 is conveyed into the inside of the reverser 4. Through the guiding action of the two reversers 4 on both sides, the ball 2 forms a circulating roll inside the nut 3. At this time, the nut 3 is driven to move. When the ball 2 is at the position between the two reversers 4 on both sides, it will touch the composite fiber fabric 7 during the moving process. The composite fiber fabric 7 adsorbs the lubricating oil stored inside the oil storage tank 5 and transfers it to the surface of the ball 2, forming a lubricating effect. The oil cap 6 facilitates adding lubricating oil into the oil storage tank 5, reducing the friction between the ball 2, the hollow lead screw 1, and the nut 3, preventing abnormal noise caused by excessive friction, and achieving the effect of automatically adding lubricating oil to the surface of the ball 2, reducing the friction between the ball 2 and the rolling groove of the nut 3 and the hollow lead screw 1, reducing noise generation, and preventing damage to the ball 2, the nut 3, and the hollow lead screw 1 caused by excessive friction, thus improving the service life of this ball screw pair.

[0022] Refer to Figure 3 and Figure 5 , the reverser 4 and the oil storage tank 5 are fixed inside the nut 3 through a fixator, and the ball 2 forms a circulating motion inside the nut 3 through the two reversers 4 on both sides.

[0023] Specifically, by fixing the reverser 4 and the oil storage tank 5 through a fixator (not shown in the figure), the reverser 4 and the oil storage tank 5 can be disassembled simultaneously, preventing the nut 3 or the hollow lead screw 1 from blocking the sight of the debugger when observing whether the ball 2 inside the nut 3 is damaged. And through the action of the two reversers 4, the ball 2 forms a circulating rotation inside the nut 3, so that only by changing the output direction of the motor base can the nut 3 move in the opposite direction, reducing the role of manual debugging operations.

[0024] Refer to Figure 6 , the composite fiber fabric 7 is made by compounding polyester fiber and carbon fiber, and the lubricating oil stored inside the oil storage tank 5 will not drip downward under the action of the composite fiber fabric 7.

[0025] Specifically, through the composite fiber fabric 7 made by compounding polyester fiber and carbon fiber, a large amount of lubricating oil is absorbed by the oil-loving fibers, and the characteristics of other fibers can be used to divert the lubricating oil inside the material, preventing the lubricating oil from falling due to the influence of gravity and filling the inside of the nut 3, affecting the rolling of the ball 2.

[0026] Refer to Figure 4 , Figure 7 and Figure 8, a limiting ring 8 is fixedly connected to the outer wall of the nut 3, a toothed ring 9 is rotatably connected to the inner wall of the limiting ring 8, a fixing column 10 is fixedly connected to the outer wall of the toothed ring 9, the toothed end of the toothed ring 9 is meshed and connected with a gear 11, a threaded column 12 is fixedly connected to the inner wall of the gear 11, a limiting column 14 is fixedly connected to the outer wall of the threaded column 12, a limiting rod 13 is fixedly connected to the inner wall of the limiting ring 8, and a sliding ring 15 is slidably connected to the outer wall of the limiting rod 13. An inner cavity 16 is formed inside the sliding ring 15.

[0027] Specifically, the user pushes the fixing column 10 to make a circular motion around the central axis of the hollow lead screw 1, thereby driving the toothed ring 9 inside the limiting ring 8 to rotate. Due to the meshing connection between the toothed ring 9 and the gear 11, the toothed ring 9 synchronously drives the gear 11 to rotate, thereby driving the threaded column 12 to rotate synchronously. Due to the threaded connection between the threaded column 12 and the sliding ring 15, the threaded column 12 drives the sliding ring 15 to rotate. And because the sliding ring 15 is restricted by the limiting rod 13, the force that the threaded column 12 drives the sliding ring 15 to rotate is converted into the force that drives the sliding ring 15 to move, and the sliding ring 15 is prevented from rotating by itself. Thereby, the sliding ring 15 moves to adapt to nut seats of different specifications, reducing the steps of manually disassembling non-matching nuts 3 and reinstalling matching nuts 3, achieving the effect of improving work efficiency.

[0028] Refer to Figure 3 and Figure 4 , the outer wall of the gear 11 is rotatably connected to the inner wall of the limiting ring 8, and the outer wall of the threaded column 12 is rotatably connected to the inner wall of the limiting ring 8.

[0029] Specifically, through the restriction of the limiting ring 8, while preventing the gear 11 from falling, the position of the gear 11 is limited to prevent the position of the gear 11 from changing and resulting in non-meshing with the gear 11. Through the support of the limiting ring 8, while preventing the threaded column 12 from tilting, it also plays a role in conducting the movement of the sliding ring 15.

[0030] Refer to Figure 4 and Figure 7 , the inside of the sliding ring 15 is threadedly connected to the outer wall of the threaded column 12, and the inner wall of the sliding ring 15 is slidably connected to the outer wall of the limiting column 14.

[0031] Specifically, through the threaded connection between the sliding ring 15 and the threaded column 12, when the threaded column 12 rotates, it drives the sliding ring 15 to rotate through the threaded groove formed in the threaded column 12, and in cooperation with the use of the limiting rod 13, the sliding ring 15 can only move and will not rotate by itself.

[0032] Refer to Figure 4 and Figure 7 , the outer wall of the limiting column 14 is slidably connected to the inner wall of the inner cavity 16, and the outer wall of the sliding ring 15 is slidably connected to the outer wall of the nut 3.

[0033] Specifically, when the sliding ring 15 moves, the limit post 14 also moves along the inner wall of the inner cavity 16. When the sliding ring 15 moves to either end on both sides, the limit post 14 fits against the inner wall of the inner cavity 16, preventing the sliding ring 15 from moving too much and falling off. Additionally, the nut 3 provides a basic support for the sliding ring 15.

[0034] Refer to Figure 7 , when the sliding ring 15 moves to one end away from or close to the limit ring 8, the limit post 14 fits against the inner wall of the inner cavity 16 at this time.

[0035] Specifically, due to the restriction of the limit post 14, the travel of the sliding ring 15 is limited to a certain extent. This not only prevents the sliding ring 15 from detaching from the outer wall of the nut 3 but also prevents the sliding ring 15 from no longer engaging with the threaded column 12.

[0036] Refer to Figure 1 and Figure 2 , the hollow lead screw 1 is made of a carbon fiber composite structure, which includes carbon fiber and titanium alloy composite materials, and the ball 2 is made of silicon nitride ceramic.

[0037] Specifically, carbon fiber is lightweight and has high strength, which can reduce the overall weight of the lead screw, improve the running speed, reduce the influence of inertia, and has good damping characteristics to absorb vibration energy, reduce vibration during operation, and is beneficial for reducing noise. Titanium alloy composite materials have high strength and corrosion resistance, enhancing the stability and durability of the support structure, ensuring the stable operation of the lead screw under complex working conditions. The ball 2 is made of silicon nitride ceramic, and ceramic materials have high hardness and strong wear resistance, which can significantly extend the service life of the ball 2, further reduce noise, and improve the transmission efficiency.

[0038] Refer to Figure 3 , a BN-AlN composite ceramic layer is deposited on the surface of the rolling groove opened on the outer wall of the hollow lead screw 1.

[0039] Specifically, the BN-AlN composite ceramic layer has high hardness and wear resistance, reducing the wear rate of the rolling groove to extend the service life of the lead screw and ensuring long-term high-precision operation. Its smooth surface can reduce the friction coefficient between the ball 2 and the rolling groove, making the ball 2 roll more smoothly, reducing energy loss, improving transmission efficiency, and reducing heat generation. This ceramic layer can also adsorb and store lubricating oil, improve the lubrication conditions, reduce the amount of lubricant used and the replacement frequency, reduce maintenance costs, and maintain the accuracy of the rolling groove in the long term.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-speed, low-noise precision ball screw pair, comprising a hollow screw rod (1), characterized in that, A ball (2) is rotatably connected to the outer wall of the hollow lead screw (1), a nut (3) is rotatably connected to the outer wall of the ball (2), reverse devices (4) are arranged on both sides of the inner wall of the nut (3), the reverse devices (4) are arranged in a mirror image, the outer wall of the ball (2) is rotatably connected to the inner wall of the reverse device (4), the outer wall of the ball (2) is rotatably connected to the inner wall of the nut (3), an oil storage tank (5) is arranged inside the nut (3), an oil cover (6) is arranged on the inner wall of the oil storage tank (5), a composite fiber cloth (7) is arranged on the inner wall of the oil storage tank (5), and the outer wall of the composite fiber cloth (7) is attached to the outer wall of the ball (2).

2. A high-speed, low-noise precision ball screw pair according to claim 1, characterized in that, The reverse device (4) and the oil storage tank (5) are fixed inside the nut (3) through a fixator, and the ball (2) forms a circular motion inside the nut (3) through the reverse devices (4) on both sides.

3. A high-speed, low-noise precision ball screw pair according to claim 1, characterized in that, The composite fiber cloth (7) is made by compounding polyester fiber and carbon fiber, and the lubricating oil stored inside the oil storage tank (5) will not drip downward under the action of the composite fiber cloth (7).

4. A high-speed and low-noise precision ball screw pair according to claim 1, characterized in that, A limiting ring (8) is fixedly connected to the outer wall of the nut (3), a toothed ring (9) is rotatably connected to the inner wall of the limiting ring (8), a fixing column (10) is fixedly connected to the outer wall of the toothed ring (9), the tooth end of the toothed ring (9) is meshed with a gear (11), a threaded column (12) is fixedly connected to the inner wall of the gear (11), a limiting column (14) is fixedly connected to the outer wall of the threaded column (12), a limiting rod (13) is fixedly connected to the inner wall of the limiting ring (8), a sliding ring (15) is slidably connected to the outer wall of the limiting rod (13), and an inner cavity (16) is formed inside the sliding ring (15).

5. A high-speed, low-noise precision ball screw pair according to claim 4, characterized in that, The outer wall of the gear (11) is rotatably connected to the inner wall of the limiting ring (8), and the outer wall of the threaded column (12) is rotatably connected to the inner wall of the limiting ring (8).

6. A high-speed, low-noise, precision ball screw pair according to claim 4, characterized in that, The inside of the sliding ring (15) is threadedly connected to the outer wall of the threaded column (12), and the inner wall of the sliding ring (15) is slidably connected to the outer wall of the limiting column (14).

7. A high-speed and low-noise precision ball screw pair according to claim 4, characterized in that, The outer wall of the limiting column (14) is slidably connected to the inner wall of the inner cavity (16), and the outer wall of the sliding ring (15) is slidably connected to the outer wall of the nut (3).

8. A high-speed, low-noise precision ball screw pair according to claim 4, characterized in that, When the sliding ring (15) moves to one end far from or close to the limiting ring (8), at this time, the limiting column (14) is in contact with the inner wall of the inner cavity (16).

9. A high-speed, low-noise precision ball screw pair according to claim 1, characterized in that The hollow lead screw (1) is made of a carbon fiber composite structure, the carbon fiber composite structure is made of carbon fiber and titanium alloy composite material, and the ball (2) is made of silicon nitride ceramic.

10. A high-speed, low-noise, precision ball screw pair according to claim 1, characterized in that, A BN-AlN composite ceramic layer is deposited on the surface of the rolling groove opened on the outer wall of the hollow lead screw (1).

Images