Gear reduction type electric cylinder

Abstract

The present invention discloses a gear reduction type electric cylinder, which comprises a motor, a piston rod, a cylinder block, a roller screw, a ball nut, a box body, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear and a transmission shaft. The first bevel gear is arranged on the driving shaft of the motor, the second bevel gear is arranged at one end of the transmission shaft and meshes with the first bevel gear, the third bevel gear is arranged at the other end of the transmission shaft, and the fourth bevel gear is arranged on the roller screw and meshes with the third bevel gear. The structural design of the present invention is ingenious. By reasonably combining and pairing multiple bevel gears to replace the torque transmission of the traditional planetary reducer or synchronous wheel assembly, it not only achieves the purpose of reducing speed and increasing torque, but also has good transmission stability and high working precision. In addition, the overall structure is compact, with a small volume and less occupied space, which is conducive to installation.

Description

Technical Field

[0001] The present invention relates to the technical field of electric cylinders, and particularly relates to a gear reduction type electric cylinder. Background Art

[0002] An electric cylinder is a modular product with an integrated design of a servo motor and a lead screw, which converts the rotational motion of the servo motor into a linear motion. At the same time, it transforms the best advantages of the servo motor - precise rotational speed control, precise revolution control, and precise torque control - into - precise speed control, precise position control, and precise thrust control; it is a brand-new revolutionary product for realizing a high-precision linear motion series.

[0003] Although the existing electric cylinders can achieve high-precision linear motion, most of their transmission and reduction adopt the following two modes: 1. For a small transmission ratio, a synchronous pulley reduction can be selected. 2. For a large reduction ratio, a planetary reducer (sometimes used in combination with a synchronous pulley) or a worm and worm gear reducer is required for transmission. If a planetary reducer is used, there will be an additional transmission mechanism, and correspondingly, enough space is needed for installation, which is large in volume, occupies a large space, and is troublesome to install. Summary of the Invention

[0004] Aiming at the above deficiencies, the purpose of the present invention is to provide a gear reduction type electric cylinder with a clever and reasonable structural design, a small volume, and convenient installation.

[0005] The technical solution provided by the present invention to achieve the above purpose is as follows:

[0006] A gear reduction type electric cylinder includes a motor, a piston rod, a cylinder block, a roller screw, a ball screw nut, a box body, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, and a transmission shaft. The cylinder block and the motor are arranged side by side on the box body. The driving shaft of the motor extends into the box body. The first bevel gear is arranged on the driving shaft. The transmission shaft is horizontally arranged in the box body through a bearing seat. The second bevel gear is arranged at one end of the transmission shaft and meshes with the first bevel gear. The third bevel gear is arranged at the other end of the transmission shaft. The roller screw is arranged in the cylinder block through a bearing. One end of the roller screw extends into the cylinder block to form a mating part, and the other end extends into the box body to form a connection part. The fourth bevel gear is arranged on the connection part and meshes with the third bevel gear. The ball screw nut is located in the cylinder block and is adapted to the roller screw. One end of the piston rod extends into the cylinder block and is connected to the ball screw nut.

[0007] As a preferred solution of the present invention, the bottom surface of the box body is provided with an opening, and a bottom cover is provided to close the opening.

[0008] As a preferred embodiment of the present invention, the cylinder block includes an upper end seat, a cylinder barrel, and a lower end seat. The upper end seat is disposed at the upper end of the cylinder barrel, the lower end seat is disposed at the lower end of the cylinder barrel, and the bearing is disposed on the lower end seat.

[0009] As a preferred embodiment of the present invention, an anti-collision block is provided on the surface of the lower end seat facing the ball screw nut, which can better protect the lower end seat and the ball screw nut in case of improper operation or overshoot.

[0010] As a preferred embodiment of the present invention, the fourth bevel gear is disposed on the connecting portion through a coupling.

[0011] As a preferred embodiment of the present invention, a vacant cavity for the mating portion of the roller screw to extend into is provided on the end face of the piston rod extending into the cylinder body.

[0012] As a preferred embodiment of the present invention, a mounting backing plate is provided between the motor and the box body.

[0013] As a preferred embodiment of the present invention, it further includes a pressure sensor and a spring wire. The piston rod is connected to the ball screw nut through the pressure sensor. The spring wire is located in the cylinder body corresponding to the lower position of the ball screw nut. One end of the spring wire passes through the side position of the ball screw nut and is connected to the pressure sensor, and the other end of the spring wire passes out of the cylinder body to form a connection end. A transmission port for the spring wire to pass through is provided on the cylinder body, which is convenient for wiring. A sealing plug is provided on the transmission port, and the sealing effect is good. The pressure sensor is reasonably arranged inside the cylinder body to form an internal structure, getting rid of the limitations of the traditional external-mounted pressure sensor. At the same time, it also solves the problems of short service life and safety caused by the easy wear of the transmission line of the traditional pressure sensor due to exposure, and also makes the appearance more concise and beautiful.

[0014] As a preferred embodiment of the present invention, a wire groove adapted to the spring wire is axially provided on the inner wall of the cylinder body for the spring wire to move correspondingly in the cylinder body along with the telescopic movement of the piston rod. A pressure sensor is provided between the piston rod and the ball screw nut. The pressure sensor is an annular pressure sensor with a reasonable structure, and the ring hole of the annular pressure sensor is for the roller screw to pass through.

[0015] The beneficial effects of the present invention are as follows: The structure of the present invention is ingeniously designed. By reasonably combining and pairing multiple bevel gears to replace the torque transmission of the traditional planetary reducer or synchronous pulley assembly, it not only achieves the purpose of reducing speed and increasing torque, but also has good transmission stability and high working precision. In addition, the overall structure is compact, small in size, occupies less space, and is conducive to installation. Description of the Drawings

[0016] Figure 1This is the overall structural schematic diagram of the present invention.

[0017] Figure 2 This is the exploded structural schematic diagram of the present invention. Detailed implementation manners

[0018] Example: Refer to Figure 1 and Figure 2 A gear reduction type electric cylinder provided by an embodiment of the present invention includes a motor 1, a piston rod 2, a cylinder block 3, a roller screw 4, a ball screw nut 5, a box body 6, a first bevel gear 7, a second bevel gear 8, a third bevel gear 9, a fourth bevel gear 10 and a transmission shaft 11.

[0019] Specifically, the bottom surface of the box body 6 is provided with an opening and a bottom cover 12 capable of closing the opening, which facilitates assembly production and daily maintenance work. The cylinder block 3 includes an upper end seat 31, a cylinder barrel 32 and a lower end seat 33. The upper end seat 31 is arranged at the upper end of the cylinder barrel 32, and the lower end seat 33 is arranged at the lower end of the cylinder barrel 32. A bearing for installing the roller screw 4 is provided at the central position of the lower end seat 33.

[0020] The cylinder block 3 is vertically arranged at one end of the box body 6, and the motor 1 is vertically arranged at the other end of the box body 6. Preferably, an installation backing plate 15 is provided between the motor 1 and the box body 6 to improve the fitting tightness and the installation stability is good. The driving shaft of the motor 1 extends into the box body 6, and the first bevel gear 7 is arranged on the driving shaft.

[0021] The transmission shaft 11 is horizontally arranged in the box body 6 through a bearing seat 13. The second bevel gear 8 is arranged at one end of the transmission shaft 11 and meshes with the first bevel gear 7. The third bevel gear 9 is arranged at the other end of the transmission shaft 11. The roller screw 4 is arranged in the cylinder block 3 through the bearing.

[0022] One end of the roller screw 4 extends into the cylinder block 3 to form a mating part, and the other end extends into the box body 6 to form a connecting part. The fourth bevel gear 10 is arranged on the connecting part through a coupling and meshes with the third bevel gear 9. The ball screw nut 5 is located in the cylinder block 3 and is adapted to the roller screw 4. One end of the piston rod 2 extends into the cylinder block 3 and is connected to the ball screw nut 5.

[0023] Preferably, an anti-collision block 14 is provided on the surface of the lower end seat 33 facing the ball screw nut 5 to better protect the lower end seat 33 and the ball screw nut 5 in case of improper operation or overshoot.

[0024] A vacant cavity 21 for the mating part of the roller screw 4 to extend into is provided on one end surface of the piston rod 2 extending into the cylinder block 3 to avoid interference with the telescopic movement of the piston rod 2.

[0025] Preferably, the gear reduction type electric cylinder of the present invention may further include a pressure sensor and a spring wire. The piston rod 2 is connected to the ball screw nut 5 through the pressure sensor. The spring wire is located inside the cylinder block 3 at a position corresponding to the lower side of the ball screw nut 5. One end of the spring wire passes through the side of the ball screw nut 5 and is connected to the pressure sensor, and the other end of the spring wire passes out of the cylinder block 3 to form a connection end. A transmission port for the spring wire to pass through is provided on the cylinder block 3, which facilitates wiring. A sealing plug is provided on the transmission port, and the sealing effect is good. The pressure sensor is reasonably arranged inside the cylinder block 3 to form an internal structure, getting rid of the limitations of the traditional external installation of the pressure sensor. At the same time, it also solves the problems of short service life and safety caused by the easy wear of the transmission line of the traditional pressure sensor due to exposure, and also makes the appearance more concise and beautiful. An axially arranged wire groove adapted to the spring wire is provided on the inner wall of the cylinder block 3 for the spring wire to move correspondingly inside the cylinder block 3 along with the telescopic movement of the piston rod 2. A pressure sensor is provided between the piston rod 2 and the ball screw nut 5. The pressure sensor is an annular pressure sensor with a reasonable structure, and the ring hole of the annular pressure sensor is for the roller screw 4 to pass through.

[0026] During operation, the purpose of reducing speed and increasing torque is achieved through the cooperation of the tooth ratios of the first bevel gear 7, the second bevel gear 8, the third bevel gear 9 and the fourth bevel gear 10, so that it can replace the traditional planetary reducer or synchronous pulley assembly transmission structure. It not only simplifies the overall structure, reduces the volume and occupies less space, but also has good transmission stability and high working accuracy.

[0027] According to the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention. As described in the above embodiments of the present invention, other electric cylinders obtained by adopting the same or similar structures are within the protection scope of the present invention.

Claims

1. A gear reduction type electric cylinder, which comprises a motor, a piston rod, a cylinder block, a roller screw rod and a ball nut, and is characterized in that, It also includes a box body, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear and a transmission shaft. The cylinder block and the motor are arranged side by side on the box body. The drive shaft of the motor extends into the box body. The first bevel gear is arranged on the drive shaft. The transmission shaft is horizontally arranged in the box body through a bearing seat. The second bevel gear is arranged at one end of the transmission shaft and meshes with the first bevel gear. The third bevel gear is arranged at the other end of the transmission shaft. The roller screw is arranged in the cylinder block through a bearing. One end of the roller screw extends into the cylinder block to form a mating part, and the other end extends into the box body to form a connecting part. The fourth bevel gear is arranged on the connecting part and meshes with the third bevel gear. The ball screw nut is located in the cylinder block and is adapted to the roller screw. One end of the piston rod extends into the cylinder block and is connected to the ball screw nut; The bottom surface of the box body is provided with an opening and a bottom cover capable of closing the opening; The cylinder block includes an upper end seat, a cylinder barrel and a lower end seat. The upper end seat is arranged at the upper end of the cylinder barrel, and the lower end seat is arranged at the lower end of the cylinder barrel. The bearing is arranged on the lower end seat.

2. The gear reduction type electric cylinder according to claim 1, wherein An anti-collision block is arranged on the surface of the lower end seat facing the ball screw nut.

3. The electric cylinder with gear reduction according to claim 1, characterized in that, The fourth bevel gear is arranged on the connecting part through a coupling.

4. The gear reduction type electric cylinder according to claim 1, wherein A vacant cavity for the mating part of the roller screw to extend into is arranged on one end surface of the piston rod extending into the cylinder block.

5. The electric cylinder with gear reduction according to claim 1, wherein An installation backing plate is arranged between the motor and the box body.

6. The electric cylinder with gear reduction according to any one of claims 1-5, characterized in that, It also includes a pressure sensor and a spring wire. The piston rod is connected to the ball screw nut through the pressure sensor. The spring wire is located in the cylinder block at a position corresponding to the lower part of the ball screw nut. One end of the spring wire passes through the side position of the ball screw nut and is connected to the pressure sensor. The other end of the spring wire passes out of the cylinder block to form a connection end.

7. The gear reduction type electric cylinder according to claim 6, characterized in that, An axially arranged wire groove adapted to the spring wire is arranged on the inner wall of the cylinder block. A pressure sensor is arranged between the piston rod and the ball screw nut.

8. The gear reduction type electric cylinder according to claim 6, wherein, The pressure sensor is an annular pressure sensor.

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