Hollow motor direct drive rail spindle axial movement gapless mechanism

Abstract

The utility model discloses a hollow motor direct drive guide rail main shaft axial movement no gap mechanism, it includes motor casing, the inside of motor casing is provided with the through hole, the inside surface fixed connection stator of motor casing, the inside of motor casing is provided with rotor, the rotor is in the stator middle, the nut is fixedly connected on the rotor far away from nail side, the inside of motor casing is provided with main shaft guide rail, the outer cylindrical surface middle position of main shaft guide rail is provided with the thread groove, the thread part of main shaft guide rail's outer cylindrical surface and the nut screw thread cooperation on the rotor, the main shaft guide rail center is provided with the cooperation hole. Through above -mentioned structure, through setting motor casing, stator, rotor, main shaft guide rail, can make rotor direct drive dynamic nut rotation, promotes the axial movement of screw guide rail, thereby reduces the reverse clearance, makes the feeding sensitivity of equipment high and makes equipment forward rotation and reverse rotation clearance reduce.

Description

Technical Field

[0001] This utility model relates to the field of guide rail spindle transmission technology, specifically a backlash-free mechanism for direct drive of guide rail spindle by a hollow motor. Background Technology

[0002] In existing technologies, spindle drives often use a combination of a motor and a worm gear or worm wheel structure to complete the transmission work.

[0003] Worm gear transmissions suffer from high precision issues. Worm gears are difficult to machine to a certain precision, the motors occupy a large space, the working efficiency is low, assembly is cumbersome, and there is a large backlash. Summary of the Invention

[0004] This utility model provides a backlash-free mechanism for the axial movement of the spindle of a hollow motor direct drive guide rail, which can reduce the feed and reverse backlash, improve the feed sensitivity of the equipment, and reduce the backlash between forward and reverse rotation.

[0005] To achieve the above objectives, a backlash-free mechanism for the axial movement of the spindle of a hollow motor direct drive guide rail is provided. The mechanism includes a motor housing with a through hole inside. A stator is fixedly connected to the inner surface of the motor housing. A rotor is disposed inside the motor housing, located in the middle of the stator. A nut is fixedly connected to the side of the rotor away from the stator. A spindle guide rail is disposed inside the motor housing. A threaded groove is provided at the center of the outer cylindrical surface of the spindle guide rail. The threaded portion of the outer cylindrical surface of the spindle guide rail engages with the nut on the rotor. A mating hole is provided at the center of the spindle guide rail. A motor encoder is disposed inside the motor housing, and the motor encoder is attached to both sides of the stator. Planar thrust bearings are fixedly connected to both end faces of the rotor. The other end of each planar thrust bearing is fixedly connected to a first fixed sleeve and a second fixed sleeve, respectively. The motor housing is designed to secure and protect the internal components. The rotor is designed to rotate the nut, which in turn moves the spindle guide. The spindle guide facilitates movement within the nut. The motor encoder is designed to detect and provide feedback on the motor's rotational position, speed, and direction.

[0006] According to the aforementioned hollow motor direct drive guide rail spindle axial movement backlash-free mechanism, a first fixing sleeve is fixedly connected to one end of a through hole inside the motor housing. The first fixing sleeve has a through circular hole at its center, through which the spindle guide rail passes. The first fixing sleeve is provided to facilitate limiting the movement trajectory of the spindle guide rail.

[0007] According to the aforementioned hollow motor direct drive guide rail spindle axial movement backlash-free mechanism, a second fixing sleeve is fixedly connected to the other end of the through hole inside the motor housing. The second fixing sleeve has a through circular hole at its center, and the spindle guide rail passes through the through circular hole of the second fixing sleeve. The second fixing sleeve is provided to facilitate limiting the movement trajectory of the spindle guide rail.

[0008] According to the hollow motor direct drive guide rail spindle axial movement backlash-free mechanism, the first fixed sleeve and the second fixed sleeve are in contact inside the motor housing, and the stator and rotor are between the first fixed sleeve and the second fixed sleeve.

[0009] According to the aforementioned hollow motor direct drive guide rail spindle axial movement backlash-free mechanism, a first bearing is provided on the outer cylindrical surface of the spindle guide rail near the first fixed sleeve, and the outer cylindrical surface of the first bearing is fixedly connected to the inner cylindrical surface of the first fixed sleeve. The first bearing is provided to reduce wear on the shaft bearing seat.

[0010] According to the hollow motor direct drive guide rail spindle axial movement backlash-free mechanism, the inner cylindrical surface of the first fixed sleeve is fixedly connected to the end away from the first bearing, and the first limiting ring is in contact with the first bearing.

[0011] According to the aforementioned hollow motor direct drive guide rail spindle axial movement backlash-free mechanism, a second bearing is provided on the outer cylindrical surface of the spindle guide rail near the second fixed sleeve, and the outer cylindrical surface of the second bearing is fixedly connected to the inner cylindrical surface of the second fixed sleeve. The first bearing is provided to facilitate reducing wear on the shaft bearing seat.

[0012] According to the hollow motor direct drive guide rail spindle axial movement backlash-free mechanism, the second limiting ring is fixedly connected to the end of the inner cylindrical surface of the second fixed sleeve away from the second bearing, and the second limiting ring and the second bearing are in contact.

[0013] The beneficial effects of this utility model are as follows: by setting up a motor housing, stator, rotor, and main shaft guide rail, the rotor can directly drive the moving nut to rotate, pushing the lead screw guide rail to move axially, thereby reducing the feed backlash, making the equipment more sensitive to feed and reducing the backlash between forward and reverse rotation.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1This is a schematic cross-sectional view of the overall structure of a backlash-free mechanism for the axial movement of the spindle of a hollow motor direct drive guide rail according to this utility model.

[0017] Legend:

[0018] 1. Motor housing; 2. First fixing sleeve; 3. Stator; 4. Rotor; 5. Main shaft guide rail; 6. Second fixing sleeve; 7. First bearing; 8. First limiting ring; 9. Second bearing; 10. Second limiting ring; 11. Motor encoder; 12. Planar thrust bearing. Detailed Implementation

[0019] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0020] Reference Figure 1 This utility model discloses a backlash-free mechanism for the axial movement of the main shaft of a hollow motor direct drive guide rail. It includes a motor housing 1 with a through hole inside. A stator 3 is fixedly connected to the inner surface of the motor housing 1. A rotor 4 is disposed inside the motor housing 1, located in the middle of the stator 3. A nut is fixedly connected to the side of the rotor 4 away from the nail. A main shaft guide rail 5 is disposed inside the motor housing 1. A threaded groove is provided in the middle of the outer cylindrical surface of the main shaft guide rail 5. The threaded portion of the outer cylindrical surface of the main shaft guide rail 5 is threadedly engaged with the nut on the rotor 4. A mating hole is provided in the center of the main shaft guide rail 5. A motor encoder 11 is disposed inside the motor housing 1, and the motor encoder 11 is attached to both sides of the stator 3. Planar thrust bearings 12 are fixedly connected to both end faces of the rotor 4. The other end of the planar thrust bearings 12 is fixedly connected to a first fixed sleeve 2 and a second fixed sleeve 6, respectively.

[0021] One end of the through hole inside the motor housing 1 is fixedly connected to the first fixing sleeve 2. The first fixing sleeve 2 has a through circular hole in the center. The main shaft guide rail 5 passes through the through circular hole of the first fixing sleeve 2. The first fixing sleeve 2 is fixed to the motor housing 1 by screws.

[0022] A first bearing 7 is provided on the outer cylindrical surface of the main spindle guide rail 5 near the first fixed sleeve 2. The outer cylindrical surface of the first bearing 7 is fixedly connected to the inner cylindrical surface of the first fixed sleeve 2. A first limiting ring 8 is fixedly connected to the end of the inner cylindrical surface of the first fixed sleeve 2 away from the first bearing 7. The first limiting ring 8 is in contact with the first bearing 7.

[0023] A second bearing 9 is provided on the outer cylindrical surface of the main spindle guide rail 5 near the second fixed sleeve 6. The outer cylindrical surface of the second bearing 9 is fixedly connected to the inner cylindrical surface of the second fixed sleeve 6. A second limiting ring 10 is fixedly connected to the end of the inner cylindrical surface of the second fixed sleeve 6 away from the second bearing 9. The second limiting ring 10 is in contact with the second bearing 9.

[0024] The other end of the through hole inside the motor housing 1 is fixedly connected to the second fixing sleeve 6. The second fixing sleeve 6 has a through circular hole in the center. The main shaft guide rail 5 passes through the through circular hole of the second fixing sleeve 6. The first fixing sleeve 2 and the second fixing sleeve 6 are in contact inside the motor housing 1. The stator 3 and the rotor 4 are between the first fixing sleeve 2 and the second fixing sleeve 6. The second fixing sleeve 6 is fixed to the motor housing 1 by screws.

[0025] Working principle: The rotor 4 of the motor is fixedly connected to the nut and fits on the main shaft guide rail 5. The rotation of the rotor 4 of the motor directly drives the nut to rotate, thereby pushing the main shaft guide rail 5 to move axially. This process does not require worm gear transmission, thereby reducing the backlash between feed and reverse rotation, making the feed sensitivity of the equipment high and reducing the backlash between forward and reverse rotation of the equipment.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail, characterized in that, The device includes a motor housing (1), which has a through hole inside. A stator (3) is fixedly connected to the inner surface of the motor housing (1). A rotor (4) is installed inside the motor housing (1). The rotor (4) is located in the middle of the stator (3). A nut is fixedly connected to the side of the rotor (4) away from the nail. A spindle guide rail (5) is installed inside the motor housing (1). A threaded groove is provided in the middle of the outer cylindrical surface of the spindle guide rail (5). The threaded part of the outer cylindrical surface of the spindle guide rail (5) is threadedly engaged with the nut on the rotor (4). A mating hole is provided in the center of the spindle guide rail (5). A motor encoder (11) is installed inside the motor housing (1). The motor encoder (11) is close to both sides of the stator (3). Planar thrust bearings (12) are fixedly connected to both end faces of the rotor (4). The other end of the planar thrust bearings (12) is fixedly connected to the first fixed sleeve (2) and the second fixed sleeve (6), respectively.

2. The backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail according to claim 1, characterized in that, The motor housing (1) has a through hole at one end that is fixedly connected to a first fixing sleeve (2). The first fixing sleeve (2) has a through hole at its center. The main shaft guide rail (5) passes through the through hole of the first fixing sleeve (2).

3. The backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail according to claim 2, characterized in that, The second fixing sleeve (6) is fixedly connected to the other end of the through hole inside the motor housing (1). The second fixing sleeve (6) has a through hole in the center. The main shaft guide rail (5) passes through the through hole of the second fixing sleeve (6).

4. The backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail according to claim 1, characterized in that, The first fixing sleeve (2) and the second fixing sleeve (6) are in contact inside the motor housing (1), and the stator (3) and the rotor (4) are between the first fixing sleeve (2) and the second fixing sleeve (6).

5. The backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail according to claim 1, characterized in that, The main spindle guide rail (5) is provided with a first bearing (7) on the outer cylindrical surface near the first fixed sleeve (2), and the outer cylindrical surface of the first bearing (7) is fixedly connected to the inner cylindrical surface of the first fixed sleeve (2).

6. The backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail according to claim 2, characterized in that, The first limiting ring (8) is fixedly connected to the end of the inner cylindrical surface of the first fixed sleeve (2) away from the first bearing (7), and the first limiting ring (8) and the first bearing (7) are in contact.

7. The backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail according to claim 1, characterized in that, The main spindle guide rail (5) is provided with a second bearing (9) on the outer cylindrical surface near the second fixed sleeve (6), and the outer cylindrical surface of the second bearing (9) is fixedly connected to the inner cylindrical surface of the second fixed sleeve (6).

8. The backlash-free axial movement mechanism for the main shaft of a hollow motor direct drive guide rail according to claim 3, characterized in that, The second limiting ring (10) is fixedly connected to the end of the inner cylindrical surface of the second fixed sleeve (6) away from the second bearing (9), and the second limiting ring (10) and the second bearing (9) are in contact.

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