CN102162477A - Actuator cylinder - Google Patents

Abstract

The invention discloses an actuator cylinder which comprises a motor (3), a speed reducer (4), a synchronous transmission mechanism, a transmission mechanism, an outer cylinder (16), a piston rod (18) and an in-position mechanism, wherein the motor (3) is connected to one end of the speed reducer (4); the other end of the speed reducer (4) is connected with the transmission mechanism of the outer cylinder (16) through the synchronous transmission mechanism; the transmission mechanism comprises a ball screw (11) and a ball screw nut (13), wherein the ball screw is installed in the outer cylinder (16) and extends along the axis of the outer cylinder (16), and the ball screw nut is sleeved on the ball screw; the ball screw nut (13) is connected with the piston rod (18); and the outer cylinder (16) is provided with the in-position mechanism. The actual cylinder is characterized in that the actuator cylinder also comprises an emergency driving mechanism, because a pneumatic emergency driving mechanism is provided, the dual-redundancy design of the actuator cylinder is realized, the function loss of the actuator cylinder when a circuit is in fault and the motor can not work is avoided, the reliability is improved, and the use safety requirement is satisfied.

Description

a cylinder

technical field

The invention relates to an actuator as a driving mechanism, in particular to an actuator driven by a motor.

Background technique

The traditional actuator is to control the movement of the piston rod in the actuator through hydraulic pressure. One application of the actuator is to use it as a driving mechanism on the aircraft landing gear retractable device. With the development of electronic technology, electric control technology has entered the On the stage of history, in the mid-1980s, the electric actuator was verified and applied on the American C-141 aircraft. Now the linear actuator on the civil aviation aircraft is also used in other parts of the aircraft as the driving mechanism. Its work The principle is as follows: the rare earth permanent magnet brushless motor is energized and rotated as the power drive source, and the ball screw screw pair is driven to rotate through the first-stage differential planetary gear train and the second-stage spur gear reducer, so that the piston rod is extended or retracted linear motion. When the piston rod is stretched out or retracted to the limit position, the gear mounted on the ball screw will drive the cam on the gear shaft to decelerate through the 3-stage reduction gear to compress and cut off the power switch to stop the motor. At the same time, the position switch outputs the limit position signal of extending or retracting, and at the same time, the arbitrary position of the piston rod can be monitored by detecting the output voltage of the feedback potentiometer installed on the camshaft of the position switch. The linear actuator on the existing civil aviation aircraft has The following disadvantages: the motor is the only driving source, and the redundancy design is generally not considered. Even if there is, it is realized through the circuit redundancy, which cannot avoid the loss of function of the actuator after the motor fails.

Contents of the invention

The technical problem to be solved by the present invention is to provide an actuating cylinder with a redundant design that can still realize the action after the motor fails.

In order to solve the above technical problems, an actuating cylinder of the present invention includes a motor, a reducer, a synchronous transmission mechanism, a transmission mechanism, an outer cylinder, a piston rod and an in-position detection mechanism, the motor is connected to one end of the reducer, and the reducer The other end is connected with the transmission mechanism in the outer cylinder through a synchronous transmission mechanism. The transmission mechanism includes a ball screw installed in the outer cylinder and extending along the axis of the outer cylinder and a ball screw nut set on the ball screw , the ball screw nut is connected with the piston rod, and the outer cylinder is provided with an in-position detection mechanism, which is characterized in that: it also includes an emergency drive mechanism, and the emergency drive mechanism includes an air motor and a clutch assembly. The motor is connected to one end of the clutch assembly, and the other end of the clutch assembly is connected to the rotating shaft of the motor. The synchronous transmission mechanism includes a tensioner, a synchronous belt, and a synchronous wheel. A locking mechanism that enables the piston rod to be locked at a specified position. The in-position detection mechanism is a micro switch that provides a signal for the control module whether the action of the piston rod has been completed. The micro switch is triggered by the locking mechanism.

Compared with the prior art, the present invention has the following positive effects. In addition to setting the motor as a driving source, the actuating cylinder of the present invention also designs a pneumatic emergency drive mechanism to realize the double redundancy design of the actuating cylinder, avoiding the function of the actuating cylinder when the circuit breaks down and the motor fails to work Loss, improve the reliability, meet the use of safety requirements.

Description of drawings

Fig. 1 is a structural schematic diagram of a jack of the present invention.

Fig. 2 is a working principle block diagram of an actuator of the present invention.

In the figure: 1. Air motor; 2. Clutch assembly; 3. Motor; 4. Reducer; 5. Synchronous belt; 6. Shaft; 7. Dust cover; 8. Upper end cover; Bolt; 11. Ball screw; 12 Bearing; 13. Ball screw nut; 14. Locking mechanism; 15. Snap ring; 16. Outer cylinder; 17. Lower end cover; 18. Piston rod; 19. Lower joint; 20. Nut; 21. Micro switch.

Detailed ways

Take the application of the actuator in the aircraft landing gear retractable system as an example below.

Fig. 1 is a structural schematic diagram of a cylinder of the present invention, a cylinder of the present invention includes a motor 3, a reducer 4, a synchronous transmission mechanism, a transmission mechanism, an outer cylinder 16, a piston rod 18 and an in-position detection mechanism, The motor 3 is connected to one end of the speed reducer 4, and the other end of the speed reducer 4 is connected to the transmission mechanism in the outer cylinder 16 through a synchronous transmission mechanism. The ball screw 11 with the center line extending and the ball screw nut 13 set on the ball screw 11, the ball screw nut 13 is connected with the piston rod 18, and the outer cylinder 16 is provided with an in-position detection mechanism, which is characterized in that : also includes an emergency drive mechanism, the emergency drive mechanism includes an air motor 1 and a clutch assembly 2, the air motor 1 is connected to one end of the clutch assembly 2, and the other end of the clutch assembly 2 is connected to the rotating shaft of the motor 3, the described There is also a locking mechanism 14 between the ball screw nut 13 and the piston rod 18 that can lock the piston rod 18 at a specified position. The in-position detection mechanism is to provide the control module with whether the action of the piston rod 18 has been completed. The microswitch 21 of the signal, the microswitch 21 is triggered by the locking mechanism 14, the synchronous transmission mechanism includes a tensioner, a synchronous belt 5 and a synchronous wheel, the motor 3 is a DC servo motor, the The synchronous transmission mechanism can also be replaced by transmission mechanisms such as belt transmission, sprocket transmission, and gear transmission.

When the power is turned on and the motor 3 works, it is decelerated by the reducer 4, and the synchronous belt 5 installed on the synchronous wheel in the synchronous transmission mechanism transmits the rotational motion of the motor to the ball screw 11 of the transmission mechanism installed in the outer cylinder 16. The rotation of the lead screw 11 is transformed into linear motion through the ball screw nut 13, which drives the locking mechanism 14 to unlock, and makes the piston rod 18 stretch back and forth relative to the outer cylinder 16. A micro switch 21 provided with an in-position detection mechanism sends an in-position signal, the control module cuts off the power supply, the motor 3 stops working, and the retraction is completed. At this time, the clutch assembly 2 in the emergency actuator is not engaged, and the air motor 1 is not working; When it cannot be retracted normally and needs to be retracted in an emergency, the control module will cut off the power of the motor 3, and at the same time, the solenoid valve will be connected, and the high-pressure air will make the pneumatic clutch assembly 2 engage and drive the air motor 1, and the clutch assembly 2 will rotate the air motor far away. The motion is transmitted to the ball screw 11 of the transmission mechanism installed in the outer cylinder 16 through the rotating shaft of the motor 3, the rotating shaft of the reducer 4 and the synchronous transmission mechanism. The rotation of the ball screw 11 is converted into linear motion through the ball screw nut 13, driving the locking mechanism 14 is unlocked, so that the piston rod 18 is stretched back and forth relative to the outer cylinder 16, and the locking mechanism 14 is locked when it is in place, and at the same time, it touches the micro switch 21 of the in-position detection mechanism on the outer cylinder 16 to send an in-position signal, and the control module is disconnected The solenoid valve realizes retracting and retracting of the landing gear.

Fig. 2 is a working principle diagram of an actuator of the present invention. Under the normal working state of the actuator, the flight control computer issues a retraction command, and the control module is powered on. If the power supply fails to work normally, it will feedback to the control module in time. The fault reporting signal is connected to the emergency drive mechanism by the control module, and the power supply is working normally, then the motor 3 on the actuator is connected. At this time, if the motor 3 cannot work normally, the fault reporting signal is fed back to the control module in time. Turn on the emergency drive mechanism, if the motor 3 works normally, the motor 3 rotates through the rotating shaft 6, and is transmitted to the ball screw 11 through the reducer 4 and the synchronous belt 5, and is converted into linear motion by the ball screw nut 13 in the outer cylinder 16, Drive the locking mechanism 14 to unlock, and then the piston rod 18 stretches and retracts to complete the retraction of the actuator. When it is in place, the steel ball lock in the locking mechanism 14 is locked. At the same time, touch the micro switch 21 to send a signal of in place. Feedback the failure reporting signal to the control module in time, the control module connects the emergency drive mechanism, retracts and puts it in place, the control module cuts off the power supply, the motor 3 stops working, and the retraction and retraction of the landing gear is completed. At this time, the clutch assembly 2 in the emergency actuator is not engaged, and the air motor 1 is not working. When the system fails to work normally, it needs to be put down in an emergency. At this time, the control module cuts off the power of the motor 3, and simultaneously the solenoid valve is connected. The high-pressure air makes the pneumatic clutch assembly 2 engage and drives the air motor 1 to work to realize the retraction of the landing gear.

Claims (7)

1. A cylinder comprises a motor (3), a speed reducer (4), a synchronous transmission mechanism, a transmission mechanism, an outer cylinder (16), a piston rod (18) and an in-position detection mechanism, and the described motor (3) It is connected to one end of the reducer (4), and the other end of the reducer (4) is connected to the transmission mechanism in the outer cylinder (16) through a synchronous transmission mechanism. The ball screw (11) extending from the axis line of the barrel (16) and the ball screw nut (13) set on the ball screw (11), the ball screw nut (13) and the piston rod (18) To connect, the outer cylinder (16) is provided with an in-position detection mechanism, which is characterized in that it also includes an emergency drive mechanism. 2. A cylinder according to claim 1, characterized in that: the emergency drive mechanism includes an air motor (1) and a clutch assembly (2), and the air motor (1) is connected to the clutch assembly One end of (2), the other end of clutch assembly (2) is connected with the rotating shaft of motor (3). 3. A cylinder according to claim 1, characterized in that: said synchronous transmission mechanism comprises a tensioning wheel, a synchronous belt (5) and a synchronous wheel. 4. An actuator cylinder according to claim 1, characterized in that: said piston rod (18) is equipped with a locking mechanism (14) that enables the piston rod (18) to be locked at a designated position. 5. A cylinder according to claim 1, characterized in that: the in-position detection mechanism is a micro switch (21) that provides the control module with a signal indicating whether the action of the piston rod (18) has been completed, so The microswitch (21) described above is triggered by the locking mechanism (14). 6. A cylinder according to claim 1, characterized in that: said synchronous transmission mechanism can also be replaced by transmission mechanisms such as belt transmission, sprocket transmission, and gear transmission. 7. A cylinder according to claim 1, characterized in that: said motor (3) is a DC servo motor.

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