Low-noise ball screw pair structure

Abstract

The utility model discloses a low-noise ball screw pair structure, which relates to the technical field of ball screw pairs, and comprises a ball screw, a moving component is arranged outside the ball screw, a retaining component is arranged between the moving component and the ball screw, and the retaining component is arranged between the moving component and the ball screw. According to the technical scheme, the problems that steel balls of an existing ball screw sharply reverse in a narrow space of a circulator, the speed change is large, the steel balls frequently collide when entering and exiting the circulator, the steel balls collide with one another, and the steel balls are prone to collide with one another are solved, so that the service life of the ball screw is prolonged, and the service life of the ball screw is prolonged. As a main source of noise and vibration of a lead screw pair, the requirement is difficult to meet under the mute requirement of an automobile brake, due to the influence of manufacturing errors, a step exists at an interface of a nut raceway and a circulator, clamping stagnation of the lead screw pair and even damage to the circulator are easily caused by long-term use, and meanwhile, the machining process of the circulator and a nut corresponding mounting hole is complex, and the machining cost is high. And the cost of the lead screw pair is high.

Description

Technical Field

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

[0002] A ball screw assembly is a precision transmission device composed of a screw, nut, and balls. Its core function is to convert rotary motion into linear motion, or vice versa. Automotive brakes use ball screw assemblies. The spiral grooves of both the screw and the nut are Gothic double-circular-arc raceways. The balls are located between the screw and the nut as the transmission medium, transmitting the rotational motion of the screw to the nut to achieve axial movement of the nut. There is a circulation device on the nut or the screw to ensure that the balls rotate continuously without detaching from the nut.

[0003] For example, Chinese patent CN2906211Y (Ball Screw Assembly) comprises a screw, a nut, and steel balls. The screw meshes with the nut via the steel balls, which are positioned in the clearance between the screw and the nut. A non-metallic spacer is provided between adjacent steel balls. This invention applies to spacers in ball screw assemblies. By adding such spacers between every two steel balls in the ball screw assembly, friction and collision between the steel balls during operation are reduced, as is sliding friction. Furthermore, the spacer is made of oil-impregnated nylon (polyimide), which possesses self-lubricating properties and exhibits superior performance at high speeds in the presence of grease. The lubricating oil adsorbed on its surface forms a stable and reliable lubricating film, significantly reducing the coefficient of friction and heat generation. Therefore, ball screw assemblies using this type of spacer can significantly reduce noise and temperature rise during high-speed operation.

[0004] However, in existing ball screws, the steel balls rapidly change direction within the narrow space of the circulator, resulting in large speed variations. Frequent collisions of the steel balls entering and exiting the circulator, as well as collisions between the steel balls themselves, are the main sources of noise and vibration in the screw assembly. This is difficult to meet the requirements for quiet operation in automotive braking systems. Furthermore, due to manufacturing errors, there are steps at the interface between the nut raceway and the circulator, which can easily lead to jamming of the screw assembly or even damage to the circulator with long-term use. At the same time, the machining process for the circulator and the corresponding mounting holes of the nut is complex, resulting in high costs for the screw assembly. Therefore, this design does not meet the current requirements. To address this, we propose a low-noise ball screw assembly structure. Utility Model Content

[0005] The purpose of this invention is to provide a low-noise ball screw assembly structure to solve the problems mentioned in the background art. These problems include the rapid reversal of the steel balls in the narrow space of the circulator, large speed changes, frequent collisions when the steel balls enter and exit the circulator, and collisions between the steel balls themselves. These are the main sources of noise and vibration in the ball screw assembly, making it difficult to meet the quietness requirements of automotive brakes. Furthermore, due to manufacturing errors, there are steps at the interface between the nut raceway and the circulator, which can easily lead to jamming of the ball screw assembly or even damage to the circulator after long-term use. Additionally, the complex machining processes for the circulator and the corresponding mounting holes of the nut result in high costs for the ball screw assembly.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-noise ball screw assembly structure, comprising: a ball screw, a movable component disposed outside the ball screw, a retaining component disposed between the movable component and the ball screw, and the movable component moving along the ball screw via the retaining component, the retaining component comprising a steel ball retainer, a communicating groove disposed at the center of the steel ball retainer, and the steel ball retainer being sleeved on the outside of the ball screw via the communicating groove.

[0007] Preferably, the outer wall of the steel ball retainer is provided with ball grooves, and there are multiple ball grooves, which are distributed in an equidistant array. The retaining component also includes balls, and there are multiple balls, which are respectively locked inside the multiple ball grooves, with the upper and lower ends of the balls extending out of the ball grooves.

[0008] Preferably, the movable component includes a ball nut, the ball nut having a through groove inside, the through groove passing through the ball nut front and back, and the ball nut being sleeved on the outside of the ball screw through the through groove, and both ends of the ball nut being provided with a stop pin.

[0009] Preferably, the inner wall of the through groove is provided with a ball moving groove, and the upper part of the ball is in contact with the inner wall of the ball moving groove.

[0010] Preferably, the ball screw includes a screw body, the outer surface of which is provided with a screw groove, and the lower end of the ball contacts the inner wall of the screw groove.

[0011] Preferably, the ball screw further includes a connecting column, which is welded and fixed to the screw body. One end of the connecting column is provided with a connector, and the outer wall of the connector is provided with a connecting groove, and multiple connecting grooves are provided.

[0012] Preferably, the ball screw and the moving assembly are both made of steel, which have been hardened to a surface hardness of HRC or higher, and the screw groove and the ball moving groove are both Gothic double arc raceways, and the steel ball cage is made of stainless steel.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) This utility model sets a retaining component between the ball screw and the ball nut. The retaining component consists of a steel ball retainer and balls. The balls are used as the transmission medium between the screw body and the ball nut. Multiple balls are respectively stuck in multiple ball slots. The steel ball retainer isolates the multiple balls, ensuring that the balls do not collide with each other, eliminating the noise between the balls and achieving a low noise effect. In addition, there are stop pins at both ends of the ball nut. When the steel ball retainer and the balls run to the stop pin position, they are blocked and cannot continue to move forward, thus ensuring that the ball nut will not disengage from the screw groove. The circulator structure is eliminated as a whole. The balls always run in the screw groove and the ball moving groove, eliminating the risk of steel ball jamming and jamming caused by the processing error of the circulator. The ball moving groove adopts a threaded structure, which is simple to process and greatly reduces the processing cost of the nut. Compared to traditional structures, with the same ball nut length, the load-bearing capacity remains unchanged, but the outer diameter of the ball nut can be made smaller. Because it is freed from the structural design limitations of the circulator, the number of bearing balls can be increased to offset the decrease in load-bearing capacity caused by the reduced number of balls due to the steel ball cage, while also reducing the outer diameter of the ball nut, making the installation space more compact. This solves the problem of the existing ball screw's steel balls rapidly changing direction and experiencing large speed changes within the narrow space of the circulator, which is the main source of noise and vibration in the screw assembly. This is difficult to meet the quietness requirements of automotive brakes. Furthermore, due to manufacturing errors, there are steps at the interface between the nut raceway and the circulator, which can easily lead to jamming of the screw assembly or even damage to the circulator with long-term use. Additionally, the complex machining processes for the circulator and the corresponding mounting holes of the nut result in high costs for the screw assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the connection structure between the ball screw and the retaining assembly of this utility model.

[0017] Figure 3 This is a schematic diagram of the retaining component structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the mobile component of this utility model;

[0019] In the diagram: 1. Ball screw; 2. Moving component; 3. Screw body; 4. Screw groove; 5. Connecting column; 6. Connector; 7. Retaining component; 8. Ball retainer; 9. Ball groove; 10. Ball; 11. Ball nut; 12. Through groove; 13. Ball moving groove; 14. Connecting groove; 15. Connecting groove; 16. Stop pin. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figure 1-4 This utility model provides an embodiment of a low-noise ball screw assembly structure, comprising: a ball screw 1, a movable component 2 disposed outside the ball screw 1, a retaining component 7 disposed between the movable component 2 and the ball screw 1, and the movable component 2 moving along the ball screw 1 via the retaining component 7, the retaining component 7 including a ball retainer 8, a connecting groove 14 disposed at the center of the ball retainer 8, and the ball retainer 8 being sleeved on the outside of the ball screw 1 through the connecting groove 14, and a ball retainer groove 9 disposed on the outer wall of the ball retainer 8, and the ball retainer groove 9 being... The ball screw 1 is provided with multiple ball bearing slots 9 evenly distributed in an array. The retaining component 7 also includes multiple balls 10, each of which is respectively engaged in multiple ball bearing slots 9. The upper and lower ends of the balls 10 extend out of the ball bearing slots 9. The moving component 2 includes a ball nut 11, which has a through groove 12 inside. The through groove 12 passes through the ball nut 11 from front to back, and the ball nut 11 is fitted onto the outside of the ball screw 1 through the through groove 12. Both ends of the ball nut 11 are provided with stop pins 16. The inner wall of the through groove 12 is... A ball screw 1 is provided with a ball movement groove 13, and the upper surface of the ball 10 contacts the inner wall of the ball movement groove 13. The ball screw 1 includes a screw body 3, and a screw groove 4 is provided on the outer surface of the screw body 3. The lower surface of the ball 10 contacts the inner wall of the screw groove 4. Both the screw groove 4 and the ball movement groove 13 are Gothic double-arc raceways. A steel ball cage 8 is fitted onto the outside of the screw body 3 of the ball screw 1 through a connecting groove 14. A ball nut 11 is fitted onto the outside of the ball screw 1 and connected by a moving assembly 2. At this time, the upper surface of the ball 10 contacts the inner wall of the ball movement groove 13. The lower end of the ball 10 contacts the inner wall of the screw groove 4. The ball 10 serves as the transmission medium between the screw body 3 and the ball nut 11. Multiple balls 10 are respectively locked in multiple ball slots 9. The multiple balls 10 are isolated by the steel ball retainer 8 to ensure that the balls 10 do not collide with each other and to eliminate the noise between the balls 10. There are stop pins 16 at both ends of the ball nut 11. When the steel ball retainer 8 and the balls 10 run to the position of the stop pins 16, they are blocked and cannot continue to move forward, thus ensuring that the ball nut 11 will not disengage from the screw groove 4.

[0022] The circulator structure has been completely eliminated. The balls 10 always run within the screw groove 4 and the ball moving groove 13, eliminating the risk of steel ball jamming or stuck due to circulator machining errors. The ball moving groove adopts a threaded structure, which simplifies the manufacturing process and significantly reduces the machining cost of the nut. Compared with the traditional structure, the load-bearing capacity remains the same for the same ball nut 11 length, but the outer diameter of the ball nut 11 can be made smaller. Since it is free from the structural design limitations of the circulator, the number of bearing balls 10 can be increased to offset the decrease in load-bearing capacity caused by the reduction in the number of balls 10 due to the steel ball cage 8. At the same time, the outer diameter of the ball nut 11 can be reduced, making the installation space more compact.

[0023] Please see Figure 1 , 2 The ball screw 1 also includes a connecting post 5, which is welded and fixed to the screw body 3. One end of the connecting post 5 is provided with a connector 6, and the outer wall of the connector 6 is provided with a connecting groove 15. Multiple connecting grooves 15 are provided. The connector 6 is used to fix the ball screw 1 to the external fixing structure.

[0024] Please see Figure 1 , 3 Both the ball screw 1 and the moving assembly 2 are made of steel, hardened to a surface hardness of HRC58 or higher. The ball cage 8 is made of stainless steel and employs a design method that increases the diameter of the steel balls and reduces the adaptability of the raceway. The ratio of the Gothic arc to the lead reaches 0.8, which is higher than the 0.6 ratio of conventional ball screws. The adaptability of the double arc raceway reaches 1.03, and the overall load-bearing capacity is increased by more than 20% compared to conventional products. The ball cage 8 is made of oil-impregnated resin or copper, which has a self-lubricating function and can absorb changes in the motion characteristics of the steel balls after abnormal loading, maintaining their original motion characteristics. In high and low temperature applications, stainless steel material + grease can also be used to improve hardness and corrosion resistance, and extend the service life of the ball screw assembly.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-noise ball screw pair structure, comprising a ball screw (1), characterized in that: A moving component (2) is provided on the outside of the ball screw (1), and a retaining component (7) is provided between the moving component (2) and the ball screw (1). The moving component (2) moves along the ball screw (1) through the retaining component (7). The retaining component (7) includes a steel ball retainer (8). A connecting groove (14) is provided at the center of the steel ball retainer (8), and the steel ball retainer (8) is sleeved on the outside of the ball screw (1) through the connecting groove (14).

2. The low-noise ball screw pair structure according to claim 1, characterized in that: The outer wall of the steel ball retainer (8) is provided with ball grooves (9), and there are multiple ball grooves (9) arranged in an equidistant array. The retaining component (7) also includes balls (10), and there are multiple balls (10), and the multiple balls (10) are respectively locked inside the multiple ball grooves (9). The upper and lower ends of the balls (10) both protrude from the ball grooves (9).

3. The low-noise ball screw pair structure according to claim 2, characterized in that: The moving component (2) includes a ball nut (11), which has a through groove (12) inside. The through groove (12) passes through the ball nut (11) from front to back, and the ball nut (11) is sleeved on the outside of the ball screw (1) through the through groove (12). Both ends of the ball nut (11) are provided with stop pins (16).

4. The low-noise ball screw pair structure according to claim 3, characterized in that: The inner wall of the through groove (12) is provided with a ball moving groove (13), and the upper part of the ball (10) is in contact with the inner wall of the ball moving groove (13).

5. The low-noise ball screw pair structure according to claim 4, characterized in that: The ball screw (1) includes a screw body (3), and a screw groove (4) is provided on the outer surface of the screw body (3), and the lower end surface of the ball (10) is in contact with the inner wall of the screw groove (4).

6. The low-noise ball screw pair structure according to claim 5, characterized in that: The ball screw (1) also includes a connecting column (5), and the connecting column (5) is welded and fixed to the screw body (3). One end of the connecting column (5) is provided with a connector (6), and the outer wall of the connector (6) is provided with a connecting groove (15), and multiple connecting grooves (15) are provided.

7. The low-noise ball screw pair structure according to claim 5, characterized in that: The ball screw (1) is made of steel and has been hardened to a surface hardness of HRC58 or higher. The screw groove (4) and the ball movement groove (13) are both Gothic double circular arc raceways.

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