Ball screw motor

Abstract

This utility model relates to the field of ball screw motor technology and discloses a ball screw motor, including a motor body, a screw rod body, a nut, and ball bodies. The output end of the motor body is connected to one end of the screw rod body. The screw rod body has a helical raceway. The nut is sleeved on the screw rod body, and the inner wall of the nut has an inner raceway that mates with the helical raceway. The ball bodies are disposed within the raceway space formed by the helical raceway and the inner raceway. End caps are provided at both ends of the motor body. In this utility model, the two ends of the screw are supported by bearings on the end caps of the motor body. The inner ring mates with the screw, and the outer ring mates with the bearing holes of the end caps, effectively bearing radial loads and reducing the shaking during screw rotation. Combined with the arc-shaped design of the helical raceway of the screw and the inner raceway of the nut to match the ball radius, rolling friction resistance is reduced, ensuring the stability and accuracy of the transmission process.

Description

Technical Field

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

[0002] Ball screw motors are electric devices commonly used for precision positioning and high-load driving, and are widely used in CNC machine tools, automation equipment, and robotics. They achieve precise linear displacement control by rotating a motor to drive a lead screw, offering high accuracy and stability, and are suitable for applications requiring high-precision movement and large thrust.

[0003] Traditional ball screw motors typically consist of a motor, ball screw, nut, threaded rod, and other related components. The motor drives the threaded rod to rotate, converting rotational motion into linear motion through the interaction of the balls and the thread. The design of the ball screw effectively reduces friction, improving transmission efficiency and service life.

[0004] The relatively low transmission efficiency of traditional ball screw motors is primarily due to frictional losses in their mechanical transmission system. Although ball screws reduce friction through rolling, minute contact friction still exists between the balls and the screw, inevitably leading to some energy loss. Furthermore, traditional transmission systems often require handling heavy loads and high speeds, increasing frictional heat and system load, further impacting transmission efficiency, especially under prolonged high-load operation where efficiency losses become more pronounced. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a ball screw motor, which aims to improve the problem that the transmission efficiency of traditional ball screw motors is relatively low, thereby increasing frictional heat and system load, and further affecting transmission efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a ball screw motor, comprising a motor body, a screw rod body, a nut, and a ball body. The output end of the motor body is connected to one end of the screw rod body. The screw rod body is provided with a helical raceway. The nut is sleeved on the screw rod body. The inner wall of the nut is provided with an inner raceway that cooperates with the helical raceway. The ball body is disposed within the raceway space formed by the helical raceway and the inner raceway.

[0007] Furthermore, the motor body is provided with end caps at both ends, and the end caps are provided with bearings for supporting the lead screw body. The inner ring of the bearings cooperates with the lead screw body, and the outer ring cooperates with the bearing hole of the end caps.

[0008] Furthermore, the helical raceway on the lead screw body is an arc-shaped raceway, and the inner raceway on the inner wall of the nut is also an arc-shaped raceway, and the radii of the helical raceway and the inner raceway are adapted to the radius of the ball body.

[0009] Furthermore, the nut is provided with a ball return section, which includes a return channel disposed inside the nut. The two ends of the return channel are respectively connected to the two ends of the raceway space, so as to make the ball body circulate within the raceway space and the return channel.

[0010] Furthermore, the end cover of the motor body is provided with a mounting flange, and the mounting flange is provided with a plurality of mounting holes for fixing the motor body to an external device.

[0011] Furthermore, the bearing is a deep groove ball bearing, and there are two bearings, which are respectively disposed at both ends of the lead screw body to support the lead screw body and bear radial loads.

[0012] Furthermore, the nut is provided with dustproof seals at both ends, which are in contact with the outer surface of the lead screw body to prevent dust and impurities from entering the raceway space.

[0013] Furthermore, the other end of the lead screw body is provided with a connecting shaft head, which is used to connect with an external transmission mechanism. The outer circumferential surface of the connecting shaft head is provided with a keyway for transmitting torque.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, the two ends of the lead screw are first supported by bearings on the end caps of the motor body. The inner ring is matched with the lead screw and the outer ring is matched with the bearing hole of the end cap, which effectively bears the radial load and reduces the shaking when the lead screw rotates. Combined with the design of the arc-shaped matching ball radius of the lead screw helical raceway and the inner raceway of the nut, the rolling friction resistance is reduced, ensuring the stability and accuracy of the transmission process.

[0016] 2. In this utility model, the mounting flange and mounting holes on the end cover facilitate the quick fixation of the motor body to external equipment, simplifying the installation process. At the same time, the dustproof seals at both ends of the nut contact the outer surface of the lead screw to form a dustproof barrier, preventing dust and impurities from entering the raceway space, avoiding wear on the balls and raceway, extending the service life of the motor and reducing maintenance requirements. Attached Figure Description

[0017] Figure 1 This is a perspective view of a ball screw motor proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of the screw structure of a ball screw motor proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the nut structure of a ball screw motor proposed in this utility model;

[0020] Figure 4 This is a schematic diagram of the mounting flange structure of a ball screw motor proposed in this utility model.

[0021] Legend:

[0022] 1. Motor body; 2. Lead screw body; 3. Nut; 4. Ball body; 5. Spiral raceway; 6. Inner raceway; 7. End cover; 8. Bearing; 9. Ball return section; 10. Return channel; 11. Mounting flange; 12. Mounting hole; 13. Dustproof seal; 14. Connecting shaft head; 15. Keyway. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figures 1-4This utility model provides an embodiment of a ball screw motor, comprising a motor body 1, a screw body 2, a nut 3, and a ball body 4. The output end of the motor body 1 is connected to one end of the screw body 2. The screw body 2 is provided with a helical raceway 5. The nut 3 is sleeved on the screw body 2, and the inner wall of the nut 3 is provided with an inner raceway 6 that mates with the helical raceway 5. The ball body 4 is disposed within the raceway space formed by the helical raceway 5 and the inner raceway 6. The motor body 1 is provided with end caps 7 at both ends, and the end caps 7 are provided with bearings 8 for supporting the screw body 2. The inner ring of the bearing 8 mates with the screw body 2, and the outer ring mates with the bearing hole of the end cap 7. The helical raceway 5 on the screw body 2 is an arc-shaped raceway, and the inner raceway 6 on the inner wall of the nut 3 is also an arc-shaped raceway. The radii of the helical raceway 5 and the inner raceway 6 are adapted to the radius of the ball body 4. The nut 3 is provided with a ball return section 9. 9 includes a return channel 10 disposed inside the nut 3. The two ends of the return channel 10 are respectively connected to the two ends of the raceway space, which is used to make the ball body 4 circulate and roll in the raceway space and the return channel 10. The end cover 7 of the motor body 1 is provided with a mounting flange 11. The mounting flange 11 is provided with multiple mounting holes 12. The mounting holes 12 are used to fix the motor body 1 to an external device. The bearing 8 is a deep groove ball bearing. There are two bearings 8, which are respectively disposed at the two ends of the lead screw body 2, and are used to support the lead screw body 2 and bear radial load. The two ends of the nut 3 are provided with dustproof seals 13. The dustproof seals 13 are in contact with the outer surface of the lead screw body 2, and are used to prevent dust and impurities from entering the raceway space. The other end of the lead screw body 2 is provided with a connecting shaft head 14. The connecting shaft head 14 is used to connect with an external transmission mechanism. The outer peripheral surface of the connecting shaft head 14 is provided with a keyway 15 for transmitting torque.

[0025] Specifically, the motor body 1 drives the lead screw body 2 to rotate through the output power. The helical raceway 5 on the lead screw body 2 is tightly engaged with the inner raceway 6 on the inner wall of the nut 3. The ball body 4 rolls in the raceway space between the helical raceway 5 and the inner raceway 6, converting the rotational motion of the lead screw body 2 into the linear motion of the nut 3. The two ends of the lead screw body 2 are supported by deep groove ball bearings 8 on the end cap 7. These bearings 8 ensure the stability of the lead screw body 2 during rotation and can withstand radial loads. The arc-shaped design of the helical raceway 5 and the inner raceway 6 is adapted to the radius of the ball body 4, thereby optimizing rolling contact and reducing friction. The nut 3 is provided with a ball return section 9 and an internal return section 9. In channel 10, the ball bearing body 4 circulates within the raceway space and return channel 10, ensuring continuous transmission. The motor body 1 is fixed to an external device via the mounting holes 12 of the mounting flange 11 on the end cover 7. The connecting shaft 14 at the other end of the lead screw body 2 is connected to an external transmission mechanism via a keyway 15 for torque transmission. Simultaneously, the dustproof seals 13 at both ends of the nut 3 effectively prevent dust and impurities from entering the raceway space, ensuring system operating accuracy and extending component lifespan. Compared to the sliding friction of traditional lead screws, the rolling motion of the ball bearing body 4 within the raceway space significantly reduces friction, thereby significantly improving transmission efficiency and reducing energy loss.

[0026] Working principle: The motor body 1 outputs power to drive the lead screw body 2 to rotate. The helical raceway 5 on the lead screw body 2 cooperates with the inner raceway 6 on the inner wall of the nut 3. The ball body 4 rolls in the raceway space formed by the helical raceway 5 and the inner raceway 6, converting the rotational motion of the lead screw body 2 into the linear motion of the nut 3. The two ends of the lead screw body 2 are supported by deep groove ball bearings 8 on the end cover 7 to ensure rotational stability and bear radial load. The arc-shaped helical raceway 5 and the inner raceway 6 are adapted to the radius of the ball body 4 to optimize rolling contact. The ball return part 9 and the internal return channel 10 on the nut 3 make the ball body 4 circulate and roll in the raceway space and the return channel 10 to maintain continuous transmission. The motor body 1 is fixed to the external equipment through the mounting holes 12 of the mounting flange 11 on the end cover 7. The connecting shaft head 14 at the other end of the lead screw body 2 is connected to the external transmission mechanism through the keyway 15 to transmit torque. The dustproof seals 13 at both ends of the nut 3 prevent dust and impurities from entering the raceway space, ensuring operating accuracy and component life.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A ball screw motor, comprising a motor body (1), a screw body (2), a nut (3), and a ball body (4), characterized in that: The output end of the motor body (1) is connected to one end of the lead screw body (2). The lead screw body (2) is provided with a helical raceway (5). The nut (3) is sleeved on the lead screw body (2). The inner wall of the nut (3) is provided with an inner raceway (6) that cooperates with the helical raceway (5). The ball body (4) is located in the raceway space formed by the helical raceway (5) and the inner raceway (6). The helical raceway (5) on the lead screw body (2) The inner raceway (6) of the nut (3) is an arc-shaped raceway, and the radius of the spiral raceway (5) and the inner raceway (6) is adapted to the radius of the ball body (4). The motor body (1) is provided with end caps (7) at both ends. The end caps (7) are provided with bearings (8) for supporting the lead screw body (2). The inner ring of the bearing (8) is engaged with the lead screw body (2), and the outer ring is engaged with the bearing hole of the end cap (7).

2. The ball screw motor according to claim 1, characterized in that: The nut (3) is provided with a ball return section (9), which includes a return channel (10) disposed inside the nut (3). The two ends of the return channel (10) are respectively connected to the two ends of the raceway space, so as to make the ball body (4) circulate and roll in the raceway space and the return channel (10).

3. A ball screw motor according to claim 1, characterized in that: The motor body (1) has an end cover (7) with a mounting flange (11) and a plurality of mounting holes (12) on the mounting flange (11). The mounting holes (12) are used to fix the motor body (1) to an external device.

4. A ball screw motor according to claim 3, characterized in that: The bearing (8) is a deep groove ball bearing. There are two bearings (8), which are respectively set at both ends of the lead screw body (2) to support the lead screw body (2) and bear radial load.

5. A ball screw motor according to claim 4, characterized in that: The nut (3) is provided with dustproof seals (13) at both ends. The dustproof seals (13) are in contact with the outer surface of the lead screw body (2) to prevent dust and impurities from entering the raceway space.

6. A ball screw motor according to claim 5, characterized in that: The other end of the lead screw body (2) is provided with a connecting shaft head (14), which is used to connect with an external transmission mechanism. The outer circumferential surface of the connecting shaft head (14) is provided with a keyway (15) for transmitting torque.

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