Low-noise ball screw pair

Abstract

The utility model provides a low-noise ball screw pair which comprises a lead screw, a nut in threaded connection with the lead screw, end covers located at the front end and the rear end of the nut and a bolt used for locking the end covers on the nut, a spirally-distributed outer ring groove is formed in the periphery of the lead screw, an inner ring groove is formed in the inner wall of the nut, and the inner ring groove is matched with the outer ring groove. The outer ring groove and the inner ring groove are matched to form a roller path for placing balls; a lubricating part is arranged in the middle of the nut, and a plurality of noise reduction groove holes are formed in the front end and the rear end of the nut in the circumferential direction. The balls roll in the raceways, friction is reduced, and relative movement between the lead screw and the nut is achieved. A lubricating part is arranged in the middle of the nut and used for storing a lubricating agent so as to reduce friction and abrasion between the balls and the raceway and reduce noise at the same time; a plurality of noise reduction groove holes are formed in the front end and the rear end of the nut in the circumferential direction, and vibration and noise of the lead screw and the nut can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of ball screw pair technology, and in particular to a low-noise ball screw pair. Background Technology

[0002] Ball screw assemblies are a common linear motion transmission device, widely used in CNC machine tools, precision instruments, and automation equipment. They achieve efficient transmission and precise positioning through the rolling of balls between the screw and nut. However, ball screw assemblies generate noise and vibration during high-speed operation, which not only affects the operating accuracy and lifespan of the equipment but may also adversely impact the operating environment and operators.

[0003] Although ball screw assemblies perform well in terms of precision and efficiency, they still have some shortcomings in noise reduction: when the balls roll in the raceway, the friction of the contact surface will generate a certain amount of noise. In addition, existing ball screw assemblies are inadequate in terms of lubrication, and the uneven distribution of lubricant will increase the friction between the balls and the raceway, thus increasing the noise. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a low-noise ball screw pair to solve the problems of noise and insufficient lubrication in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides the following technical solution:

[0006] A low-noise ball screw assembly includes a screw, a nut threadedly connected to the screw, end caps located at the front and rear ends of the nut, and bolts for locking the end caps onto the nut. The screw has a spirally arranged outer annular groove on its outer periphery, and the nut has an inner annular groove on its inner wall. The outer annular groove and the inner annular groove cooperate to form a raceway for placing balls. The nut has a lubrication part in the middle, and several noise-reducing slots are formed circumferentially at the front and rear ends of the nut.

[0007] To achieve the above technical solution, the outer circumference of the lead screw has a helically arranged outer annular groove, and the inner wall of the nut has an inner annular groove. These two grooves cooperate to form the raceway for the balls. The balls roll in the raceway, reducing friction and achieving relative movement between the lead screw and the nut. A lubrication section is provided in the middle of the nut to store lubricant, reducing friction and wear between the balls and the raceway, while also reducing noise. Several noise-reducing slots are provided circumferentially at both ends of the nut, which helps to reduce vibration and noise of the lead screw and nut.

[0008] In one embodiment of the present invention, the lubrication part includes a protrusion located in the middle of the nut and protruding outward, and an annular oil groove formed in the protrusion. The annular oil groove has an oil outlet hole communicating with the inner annular groove and an oil inlet hole communicating with the outside.

[0009] To achieve the above technical solution, the lubrication part is located in the middle of the nut and protrudes outward to form a convex part. An annular oil groove is provided on this convex part, which is a space for storing lubricating oil; the oil outlet is connected to the inner annular groove, so that lubricant can flow from the annular oil groove into the raceway of the ball to lubricate the ball and the raceway; the oil inlet is connected to the outside and is used to replenish the lubricating oil in the annular oil groove.

[0010] In one embodiment of this utility model, an oil seal is provided on the oil inlet hole, and oil-absorbing cotton is embedded in the bottom of the annular oil groove and the oil outlet hole.

[0011] To achieve the above technical solution, an oil seal is provided on the oil inlet hole. The function of the oil seal is to prevent external dust and impurities from entering the annular oil groove, and at the same time to prevent lubricant leakage. The function of the oil-absorbing cotton is to evenly distribute the lubricant to the oil outlet hole, thereby achieving effective lubrication of the balls and raceways.

[0012] In one embodiment of the present invention, the noise reduction slot is located inside the end cap, and a noise reduction component is provided in the noise reduction slot.

[0013] To achieve the above technical solution, the noise reduction slot is designed on the inside of the end cap. This layout helps to form a closed noise reduction space inside the ball screw pair, thereby reducing the outward transmission of noise. The noise reduction components embedded in the noise reduction slot can absorb and reduce the vibration and noise of the balls in the raceway.

[0014] In one embodiment of this utility model, the noise reduction component has a circular cross-section and consists of sound-absorbing cotton, a polyurethane ring, and a metal shock-absorbing ring from the inside out.

[0015] To achieve the above technical solution, the three-layer noise reduction component can more effectively absorb and isolate noise, improve the noise control capability of the ball screw pair, and the addition of the metal damping ring enhances the durability of the noise reduction component, enabling it to withstand longer use and higher mechanical stress. The sound-absorbing cotton, a porous material, can absorb sound wave energy, and the polyurethane ring can further absorb and isolate noise, as well as provide a certain degree of structural stability and protect the inner sound-absorbing cotton from physical damage.

[0016] As described above, the low-noise ball screw assembly of this utility model has the following beneficial effects: Several noise-reducing slots are provided circumferentially at both ends of the nut, which help reduce vibration and noise of the screw and nut, improving the overall noise reduction effect; a lubrication part is provided in the middle of the nut, including a protruding part extending outward and an annular oil groove formed in the protruding part. The annular oil groove is connected to the inner annular groove through an oil outlet, allowing lubricant to flow from the annular oil groove into the raceway of the ball, lubricating the ball and raceway, reducing friction and wear, and simultaneously reducing noise; oil-absorbing cotton is embedded at the bottom of the annular oil groove and in the oil outlet, which can evenly distribute the lubricant to the oil outlet, thereby achieving effective lubrication of the ball and raceway; the noise-reducing slots are designed on the inner side of the end cap, which helps to form a closed noise-reducing space inside the ball screw assembly, thereby reducing the outward transmission of noise. Attached Figure Description

[0017] Figure 1 The diagram shown is a structural schematic of this utility model.

[0018] Figure 2 The diagram shown is a cross-sectional view of this utility model.

[0019] Figure 3 Displayed as Figure 2 A magnified view of a portion of point A in the middle.

[0020] Figure 4 The view shown is a cross-sectional view of the noise reduction component.

[0021] Component designation explanation

[0022] 1. Lead screw; 2. Nut; 3. End cap; 4. Bolt; 5. Outer ring groove; 6. Inner ring groove; 7. Ball bearing; 8. Noise-reducing groove; 9. Protrusion; 10. Annular oil groove; 11. Oil outlet; 12. Oil inlet; 13. Oil seal; 14. Oil-absorbing cotton; 15. Sound-absorbing cotton; 16. Polyurethane ring; 17. Metal shock-absorbing ring. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] Please see Figures 1 to 4This utility model provides a low-noise ball screw assembly, including a screw 1, a nut 2 threadedly connected to the screw 1, end caps 3 located at the front and rear ends of the nut 2, and bolts 4 for locking the end caps 3 onto the nut 2. The screw 1 has a spirally arranged outer ring groove 5 on its outer periphery, and the nut 2 has an inner ring groove 6 on its inner wall. The outer ring groove 5 and the inner ring groove 6 cooperate to form a raceway for placing the balls 7. The nut 2 has a lubrication part in the middle, and several noise-reducing slots 8 are formed circumferentially at the front and rear ends of the nut 2.

[0025] The lead screw 1 has a spirally arranged outer ring groove 5 on its outer periphery, and the nut 2 has an inner ring groove 6 on its inner wall. These two ring grooves cooperate to form the raceway of the ball 7. The ball 7 rolls in the raceway to reduce friction and realize the relative movement between the lead screw 1 and the nut 2. The nut 2 has a lubrication part in the middle to store lubricant to reduce friction and wear between the ball 7 and the raceway, and at the same time reduce noise. Several noise reduction slots 8 are opened circumferentially at the front and rear ends of the nut 2 to help reduce the vibration and noise of the lead screw 1 and the nut 2.

[0026] The lubrication section includes a protrusion 9 located in the middle of the nut 2 and protruding outwards, and an annular oil groove 10 formed in the protrusion 9. The annular oil groove 10 has an oil outlet 11 that communicates with the inner annular groove 6 and an oil inlet 12 that communicates with the outside. The lubrication section is located in the middle of the nut 2 and protrudes outwards to form the protrusion 9. The annular oil groove 10 is formed on this protrusion 9 and is a space for storing lubricating oil. The oil outlet 11 communicates with the inner annular groove 6, so that lubricant can flow from the annular oil groove 10 into the raceway of the ball 7 to lubricate the ball 7 and the raceway. The oil inlet 12 communicates with the outside and is used to replenish the lubricating oil in the annular oil groove 10.

[0027] An oil seal 13 is provided on the oil inlet 12, and oil-absorbing cotton 14 is embedded in the bottom of the annular oil groove 10 and the oil outlet 11. The oil seal 13 on the oil inlet 12 prevents external dust and impurities from entering the annular oil groove 10 and prevents lubricant leakage. The oil-absorbing cotton 14 can evenly distribute the lubricant to the oil outlet 11, thereby achieving effective lubrication of the ball bearings 7 and the raceway.

[0028] The noise reduction slot 8 is located inside the end cap 3, and a noise reduction component is provided in the noise reduction slot 8. The noise reduction slot 8 is designed inside the end cap 3. This layout helps to form a closed noise reduction space inside the ball bearing 7 lead screw 1, thereby reducing the outward transmission of noise. The noise reduction component embedded in the noise reduction slot 8 can absorb and reduce the vibration and noise of the ball bearing 7 in the raceway.

[0029] The noise reduction component has a circular cross-section and consists of, from the inside out, sound-absorbing cotton 15, a polyurethane ring 16, and a metal damping ring 17. This three-layer structure allows for more effective noise absorption and isolation, improving the noise control capability of the ball screw assembly. The addition of the metal damping ring 17 enhances the durability of the noise reduction component, enabling it to withstand longer periods of use and higher levels of mechanical stress. The sound-absorbing cotton, a porous material, absorbs sound wave energy. The polyurethane ring 16 further absorbs and isolates noise, provides structural stability, and protects the inner sound-absorbing cotton 15 from physical damage.

[0030] Nut 2 has several noise-reducing slots 8 circumferentially formed at both ends. These slots help reduce the vibration and noise of the lead screw 1 and nut 2, improving the overall noise reduction effect. Nut 2 has a lubrication section in the middle, including a protruding part 9 extending outwards and an annular oil groove 10 formed in the protruding part 9. The annular oil groove 10 connects to the inner annular groove 6 through an oil outlet 11, allowing lubricant to flow from the annular oil groove 10 into the raceway of the ball 7, lubricating the ball 7 and raceway, reducing friction and wear, and lowering noise. Oil-absorbing cotton 14 is embedded at the bottom of the annular oil groove 10 and in the oil outlet 11, which can evenly distribute the lubricant to the oil outlet 11, thereby achieving effective lubrication of the ball 7 and raceway. The noise-reducing slots 8 are designed inside the end cap 3. This layout helps to form a closed noise-reducing space inside the ball 7 and lead screw 1 assembly, thereby reducing the outward transmission of noise.

[0031] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A low-noise ball screw assembly, comprising a screw, a nut threadedly connected to the screw, end caps located at the front and rear ends of the nut, and bolts for locking the end caps onto the nut, characterized in that: The outer circumference of the lead screw is provided with a spirally arranged outer ring groove, and the inner wall of the nut is provided with an inner ring groove. The outer ring groove and the inner ring groove cooperate to form a raceway for placing the ball. The nut has a lubrication part in the middle, and several noise reduction slots are opened at the front and rear ends of the nut along the circumferential direction.

2. The low-noise ball screw assembly according to claim 1, characterized in that: The lubrication part includes a protrusion located in the middle of the nut and protruding outward, and an annular oil groove formed in the protrusion. The annular oil groove has an oil outlet hole that communicates with the inner annular groove and an oil inlet hole that communicates with the outside.

3. A low-noise ball screw assembly according to claim 2, characterized in that: An oil seal is provided on the oil inlet, and oil-absorbing cotton is embedded in the bottom of the annular oil groove and the oil outlet.

4. A low-noise ball screw assembly according to claim 1, characterized in that: The noise reduction slot is located on the inner side of the end cap, and a noise reduction component is provided in the noise reduction slot.

5. A low-noise ball screw assembly according to claim 4, characterized in that: The noise reduction component has a circular cross-section and consists of sound-absorbing cotton, a polyurethane ring, and a metal shock-absorbing ring from the inside out.

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