Gear transmission type rotary driving device

Abstract

The invention belongs to the field of driving equipment, and provides a gear transmission type rotation driving device which comprises a rotating disc used for being connected with a component needing to rotate. The end face of the rotary driving ring is connected with the rotary disc, and a gear ring is arranged on the inner side face of the rotary driving ring; the driving source is provided with an output shaft capable of providing rotating power; each gear is meshed with the gear ring, a transmission shaft penetrates through the center of each gear, and each transmission shaft is in transmission connection with the output shaft; the at least two gears abut against the tooth faces, in different directions, of the gear ring respectively. According to the gear transmission type rotation driving device, single servo driving is adopted, prepressing torques in opposite directions are applied to the two gears at the same time, the anti-backlash effect is achieved, and the gear transmission type rotation driving device has the advantages of being simple in structure and low in cost.

Description

Technical Field

[0001] The invention relates to a rotary drive device, in particular to a gear transmission type rotary drive device. Background Art

[0002] In CNC machine tools and automation equipment, precision rotating parts are often required, such as rotary tables and swing axes of milling heads. These parts can rotate through programmable control, transmit a certain torque through the drive transmission mechanism, and accurately position the rotating parts at any rotation angle. At present, there are four main structural forms of the internal core transmission structure of rotating parts: space cam plus cam roller, worm gear transmission, torque motor direct drive, and gear set transmission. The defects of each of these four structural forms are:

[0003] The method of spatial cam plus cam roller: the cam roller shaft is subjected to shear force during the transmission process, and the force is relatively limited for larger torque loads. Moreover, the cam is a non-standard part with complex design and manufacturing processes. Large-size cams are limited by processing equipment and the production cost is very high.

[0004] Worm gear transmission: Worm gear transmission is a sliding friction transmission, which will cause friction and wear on the contact surface of the transmission parts. Over time, transmission clearance will occur, resulting in a decrease in transmission accuracy.

[0005] Torque motor direct drive mode: Due to the direct drive of the motor, there is no transmission ratio in the transmission to amplify the torque, so the transmission torque is relatively small and cannot adapt to large torque work. In addition, the torque motor generates a lot of heat and needs to be equipped with a dedicated cooling device, which is very expensive.

[0006] Gear transmission mode: The gear transmission has high rigidity and the gears are easy to manufacture and process. However, in gear transmission, there needs to be backlash between the teeth, otherwise the teeth will get stuck, and the gear backlash will cause the transmission accuracy to decrease. In order to eliminate the transmission gap, the current structure is that two small gears are meshed with a gear ring at the same time. The two small gears are driven by two servo motors respectively, and the two motors are electrically controlled to generate a torque difference, thereby eliminating the gear gap. However, this structure is expensive and must be matched with a control system with master-slave control function to achieve it. Summary of the invention

[0007] The purpose of the present invention is to overcome the existing defects and provide a gear-driven rotary drive device to solve the problems of complex structure, high cost of driving structure and anti-backlash structure in the current gear set transmission method.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A gear-driven rotary drive device comprises a rotating disk for connecting a component to be rotated; a rotating drive ring, the end face of which is connected to the rotating disk, and the inner side of which is provided with a gear ring; a driving source, the driving source having an output shaft capable of providing rotational power; at least two gears, each of which is meshed with the gear ring, a transmission shaft is provided through the center of each gear, and each of which is transmission-connected to the output shaft; and at least two of the gears respectively abut against tooth surfaces of the gear ring in different directions.

[0010] Furthermore, it includes a base, which is used to connect to the equipment support component; an annular support seat, the end face or outer side face of the annular support seat is connected to the base, the annular support seat is located on the outside of the rotating drive ring, and a rolling body is arranged between the rotating drive ring and the annular support seat so that the rotating drive ring can rotate freely and concentrically along the inner edge of the annular support seat.

[0011] Furthermore, the driving source includes a servo motor, the servo motor is connected to a reducer, and the output shaft of the reducer is coaxially connected to a driving pulley; two gears are provided, namely a first gear and a second gear, a first transmission shaft is provided through the center of the first gear, a first driven pulley is sleeved on the first transmission shaft, the first driven pulley is connected to the upper section of the driving pulley through a first synchronous belt, a second transmission shaft is provided through the center of the second gear, a second driven pulley is sleeved on the second transmission shaft, and the second driven pulley is connected to the lower section of the driving pulley through a second synchronous belt.

[0012] Furthermore, the reducer is installed in a first interface preset on the base; the lower end of the driving pulley is provided with a first bearing, the first bearing is installed in a second interface preset on the base, the lower end of the first transmission shaft is provided with a second bearing, the second bearing is installed in a third interface preset on the base, the lower end of the second transmission shaft is provided with a third bearing, the third bearing is installed in a fourth interface preset on the base; the first bearing, the second bearing and the third bearing are located in the same horizontal plane.

[0013] Furthermore, a first tensioning wheel is provided on the outer side of the first synchronous belt, the first tensioning wheel is in contact with the first synchronous belt, the upper end of the wheel axle of the first tensioning wheel is connected with a first flange seat, and the first flange seat is installed in a fifth interface preset on the base; a second tensioning wheel is provided on the outer side of the second synchronous belt, the second tensioning wheel is in contact with the second synchronous belt, the upper end of the wheel axle of the second tensioning wheel is connected with a second flange seat, and the second flange seat is installed in a sixth interface preset on the base; the first tensioning wheel and the second tensioning wheel are respectively arranged on the outer sides of the first synchronous belt and the second synchronous belt in different directions, so that the first synchronous belt and the second synchronous belt provide the first driven pulley and the second driven pulley with tensioning torques in opposite directions respectively, so that the first gear and the second gear provide the ring gear with clamping torques in opposite directions, ensuring that the first gear and the second gear respectively abut against the tooth surfaces of the ring gear in different directions.

[0014] Furthermore, the axle of the first tensioning wheel is eccentrically connected to the lower end surface of the first flange seat, and the axle of the second tensioning wheel is eccentrically connected to the lower end surface of the second flange seat.

[0015] Furthermore, a fourth bearing is sleeved on the first transmission shaft between the first gear and the first driven pulley, and the fourth bearing is installed in a seventh interface preset on the base; a fifth bearing is sleeved on the second transmission shaft between the second gear and the second driven pulley, and the fifth bearing is installed in an eighth interface preset on the base; the fourth bearing, the fifth bearing, the first flange seat and the second flange seat are located in the same horizontal plane.

[0016] The invention discloses a gear transmission type rotary driving device, which adopts a single servo drive and applies pre-compression torques in opposite directions to two gears at the same time, thereby achieving a backlash elimination effect and has the characteristics of simple structure and low cost.

[0017] The present invention also has the advantage that, by adopting the transmission method of gears and synchronous belts, different load-bearing requirements can be met by adjusting the module of the gears and the specifications of the synchronous belts. Moreover, compared with space cams, gears, synchronous belts and related components are more widely used, have more mature design and manufacturing, and are lower in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 This is a three-dimensional schematic diagram of the present invention without the rotating disk and the base. Figure 1 ;

[0021] Figure 3 This is a three-dimensional schematic diagram of the present invention without the rotating disk and the base. Figure 2 . DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0023] like Figure 1-3 As shown, a gear-driven rotary drive device comprises a rotating disk 1 for connecting the parts to be rotated; a rotating drive ring 2, the end face of which is connected to the rotating disk 1, and the inner side of the rotating drive ring 2 is provided with a gear ring; a driving source, the driving source having an output shaft capable of providing rotational power; two gears, each gear being meshed with the gear ring, a transmission shaft being provided through the center of each gear, and each transmission shaft being transmission-connected to the output shaft; the two gears respectively abut against the tooth surfaces of the gear ring in different directions.

[0024] The device also includes a base 3, which is used to connect to the equipment support component; an annular support seat 4, the end face of which is connected to the base 3, and the annular support seat 4 is located on the outside of the rotating drive ring 2. A rolling body is arranged between the rotating drive ring 2 and the annular support seat 4 so that the rotating drive ring 2 can rotate freely and concentrically along the inner edge of the annular support seat 4.

[0025] The driving source includes a servo motor 5, which is connected to a reducer 6, and the output shaft of the reducer 6 is coaxially connected to a driving pulley 7; the two gears are a first gear 8 and a second gear 9, and a first transmission shaft 10 is provided through the center of the first gear 8, and a first driven pulley 11 is sleeved on the first transmission shaft 10, and the first driven pulley 11 is connected to the upper section of the driving pulley 7 through a first synchronous belt 12; a second transmission shaft 13 is provided through the center of the second gear 9, and a second driven pulley 14 is sleeved on the second transmission shaft 13, and the second driven pulley 14 is connected to the lower section of the driving pulley 7 through a second synchronous belt 15.

[0026] The reducer 6 is installed in a first interface preset on the base 3; the lower end of the driving pulley 7 is provided with a first bearing 16, and the first bearing 16 is installed in a second interface preset on the base 3; the lower end of the first transmission shaft 10 is provided with a second bearing 17, and the second bearing 17 is installed in a third interface preset on the base 3; the lower end of the second transmission shaft 13 is provided with a third bearing 18, and the third bearing 18 is installed in a fourth interface preset on the base 3; the first bearing 16, the second bearing 17 and the third bearing 18 are located in the same horizontal plane.

[0027] A first tensioning wheel 19 is arranged on the outer side of the first synchronous belt 12, and the first tensioning wheel 19 abuts against the first synchronous belt 12. The upper end of the wheel shaft of the first tensioning wheel 19 is connected with a first flange seat 20, and the first flange seat 20 is installed in the fifth interface preset on the base 3; a second tensioning wheel 21 is arranged on the outer side of the second synchronous belt 15, and the second tensioning wheel 21 abuts against the second synchronous belt 15. The upper end of the wheel shaft of the second tensioning wheel 21 is connected with a second flange seat 22, and the second flange seat 22 is installed in the sixth interface preset on the base 3; the first tensioning wheel 19 and the second tensioning wheel 21 are respectively arranged on the outer sides of the first synchronous belt 12 and the second synchronous belt 15 in different directions, so that the first synchronous belt 12 and the second synchronous belt 15 provide tensioning torques in opposite directions to the first driven pulley 11 and the second driven pulley 14 respectively, so that the first gear 8 and the second gear 9 provide clamping torques in opposite directions to the ring gear, ensuring that the first gear 8 and the second gear 9 abut against the tooth surfaces of the ring gear in different directions respectively.

[0028] Working principle:

[0029] When in use, the base 3 is connected to the equipment support component (such as a frame, a table), and the rotating disk 1 is connected to the component that needs to rotate on the equipment (a rotating worktable, a swing shaft of a milling head). The two gears are driven to rotate at the same time by the operation of a servo motor 5, and the rotating drive ring 2 drives the rotating disk 1 to rotate through the meshing of the gears and the ring gear. Since the two gears are respectively and simultaneously against the tooth surfaces of the ring gear in different directions, the gap is eliminated in a static state, and during the rotation process, one gear controls the forward rotation of the ring gear, and the other gear controls the reverse rotation of the ring gear. When rotating forward or reverse, one gear plays a driving role and the other gear follows. Even if the rotation direction is switched, there is no need to consider the gear moving from the current tooth surface to the tooth surface in another direction as in the traditional technology, that is, the transmission gap is also eliminated in a dynamic state.

[0030] The axle of the first tensioning wheel 19 is eccentrically connected to the lower end surface of the first flange seat 20, and the axle of the second tensioning wheel 21 is eccentrically connected to the lower end surface of the second flange seat 22. By adjusting the installation angle of the first flange seat 20 and the second flange seat 22 on the base 3, the distance between the first tensioning wheel 19 and the first synchronous belt 12 and the distance between the second tensioning wheel 21 and the second synchronous belt 15 can be changed, thereby changing the tension of the first synchronous belt 12 and the second synchronous belt 15.

[0031] A fourth bearing 23 (mostly blocked) is sleeved between the first gear 8 and the first driven pulley 11 on the first transmission shaft 10, and the fourth bearing 23 is installed in the seventh interface preset on the base 3. A fifth bearing 24 is sleeved between the second gear 9 and the second driven pulley 14 on the second transmission shaft 13, and the fifth bearing 24 is installed in the eighth interface preset on the base 3; the fourth bearing 23, the fifth bearing 24, the first flange seat 20 and the second flange seat 22 are located in the same horizontal plane. The fourth bearing 23 and the fifth bearing 24 are arranged to make the position and operation of the first transmission shaft 10 and the second transmission shaft 13 more stable.

[0032] The invention discloses a gear transmission type rotary driving device, which adopts a single servo drive and applies pre-compression torques in opposite directions to two gears at the same time, thereby achieving a backlash elimination effect and has the characteristics of simple structure and low cost.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gear-driven rotary drive device, characterized in that: include A rotating disk, used to connect the parts that need to be rotated; A rotating drive ring, the end surface of which is connected to the rotating disk, and the inner side surface of which is provided with a gear ring; a drive source having an output shaft capable of providing rotational power; At least two gears, each of which is meshed with the gear ring, a transmission shaft is disposed through the center of each gear, and each of the transmission shafts is in transmission connection with the output shaft; At least two of the gears respectively abut against tooth surfaces of the gear ring in different directions.

2. A gear-driven rotary drive device according to claim 1, characterized in that: include A base, the base being used to connect with a device support component; An annular support seat, the end face or outer side face of the annular support seat is connected to the base, the annular support seat is located on the outer side of the rotating drive ring, and a rolling body is arranged between the rotating drive ring and the annular support seat so that the rotating drive ring can rotate freely and concentrically along the inner edge of the annular support seat.

3. A gear-driven rotary drive device according to claim 1, characterized in that: The driving source comprises a servo motor, the servo motor is connected to a reducer, and the output shaft of the reducer is coaxially connected to a driving pulley; The gears are provided with two, namely the first gear and the second gear. A first transmission shaft is provided through the center of the first gear, a first driven pulley is sleeved on the first transmission shaft, and the first driven pulley is connected to the upper section of the driving pulley through a first synchronous belt. A second transmission shaft is provided through the center of the second gear, a second driven pulley is sleeved on the second transmission shaft, and the second driven pulley is connected to the lower section of the driving pulley through a second synchronous belt.

4. A gear-driven rotary drive device according to claim 3, characterized in that: The reducer is installed in a first interface preset on the base; The lower end of the driving pulley is sleeved with a first bearing, which is installed in a second interface preset on the base; the lower end of the first transmission shaft is sleeved with a second bearing, which is installed in a third interface preset on the base; the lower end of the second transmission shaft is sleeved with a third bearing, which is installed in a fourth interface preset on the base; The first bearing, the second bearing and the third bearing are located in the same horizontal plane.

5. The gear-driven rotary drive device according to claim 3, characterized in that: A first tensioning wheel is arranged on the outer side of the first synchronous belt, the first tensioning wheel abuts against the first synchronous belt, the upper end of the wheel shaft of the first tensioning wheel is connected with a first flange seat, and the first flange seat is installed in a fifth interface preset on the base; A second tensioning wheel is arranged on the outer side of the second synchronous belt, the second tensioning wheel abuts against the second synchronous belt, the upper end of the wheel shaft of the second tensioning wheel is connected with a second flange seat, and the second flange seat is installed in a sixth interface preset on the base; The first tensioning wheel and the second tensioning wheel are respectively arranged on the outside of the first synchronous belt and the second synchronous belt in different directions, so that the first synchronous belt and the second synchronous belt provide tensioning torques in opposite directions to the first driven pulley and the second driven pulley respectively, so that the first gear and the second gear provide clamping torques in opposite directions to the ring gear, ensuring that the first gear and the second gear respectively abut against the tooth surfaces of the ring gear in different directions.

6. A gear-driven rotary drive device according to claim 5, characterized in that: The wheel axle of the first tensioning wheel is eccentrically connected to the lower end surface of the first flange seat, and the wheel axle of the second tensioning wheel is eccentrically connected to the lower end surface of the second flange seat.

7. The gear-driven rotary drive device according to claim 5, characterized in that: A fourth bearing is sleeved between the first gear and the first driven pulley on the first transmission shaft, and the fourth bearing is installed in a seventh interface preset on the base; a fifth bearing is sleeved between the second gear and the second driven pulley on the second transmission shaft, and the fifth bearing is installed in an eighth interface preset on the base; The fourth bearing, the fifth bearing, the first flange seat and the second flange seat are located on the same horizontal plane.

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