CN220037126U - Electromechanical actuator with emergency unlocking and stretching functions - Google Patents

Abstract

The emergency unlocking extension electromechanical actuator disclosed by the utility model has the advantages of simple structure, simplicity, compactness and reliable performance. The utility model is realized by the following technical scheme: the servo motor drives the screw gear to rotate through the clutch shaft connecting disc gear transmission mechanism, the screw nut restrains the reset spring in the hollow stepped hole of the piston head through the end cover sliding sleeve, the upper locking groove positioned on the inner wall of the outer cylinder locks the steel ball lock in the guide groove of the piston head, when in emergency work, the clutch is separated, high-pressure medium enters the outer cylinder cavity through the emergency energy inlet on the outer ring surface of the outer cylinder to form a closed-loop emergency circuit for pushing the end cover sliding sleeve to overcome the elastic force of the reset spring, the high-pressure medium pushes the front end surface of the end cover sliding sleeve to the steel ball lock limit of the end surface of the hollow stepped hole of the piston head, the steel ball lock is separated from the upper locking groove, the high-pressure medium pushes the piston cylinder to drive the screw nut to reversely drive the screw transmission pair to rotate, and meanwhile, the piston cylinder is in emergency extension, and the tasks of unlocking and extending the piston cylinder are completed.

Description

Electromechanical actuator with emergency unlocking and stretching functions

Technical Field

The utility model relates to an emergency unlocking and extending structure applied to an electromechanical actuator, in particular to an innovative structure capable of improving the safety and task reliability of the electromechanical actuator and realizing multi-medium emergency unlocking and extending of a piston cylinder.

Background

With the development of modern technology, the mission function of small or unmanned aircraft has been greatly developed and changed, and in an emergency state, the aircraft needs to be able to safely land to protect advanced and expensive on-board equipment and carried mission function equipment. Landing gear for small or unmanned aircraft should have emergency unlocking, safe and rapid landing and automatic locking functions. The electric retractable actuator cylinder is controlled by an electric control system on the aircraft, and once an emergency state such as failure of the electric control system or damage of equipment of the control system occurs, an upper mechanical lock in the electric retractable actuator cylinder cannot be opened, the electric retractable actuator cylinder cannot be put down, and an undercarriage of the aircraft cannot be put down and locked, so that the aircraft cannot fall down safely, and serious disastrous accidents are caused to the aircraft. The actuator is used as a linear motion actuating element of the landing gear of the aircraft and is an energy conversion device for realizing linear reciprocating motion or motion less than 360 degrees of a working mechanism. The basic constitution of a typical electromechanical actuator is as follows: the device comprises a motor, a reduction gearbox, a transmission part, a ball screw pair, an outer cylinder assembly, a piston cylinder assembly, a self-locking assembly and the like. An electromechanical actuator with a self-locking device prevents movement due to external forces when the actuator is stopped in a defined position, typically by a mechanical lock in the actuator cylinder. The mechanical lock is usually a steel ball lock, and consists of a steel ball lock, a locking groove, a conical piston, a spring and the like. When the power electric fault or the closed-loop position control of the system fails, the rigid collision extrusion is carried out between the inner end face and the end face of the ball screw pair at the limit position of the electromechanical actuator, so that the spiral roller path of the ball screw pair steel ball lock deforms to increase the clearance, the spiral transmission precision is reduced, and even the screw pair locking fault is caused to cause the function loss of the electromechanical actuator. The actuator with the emergency function is generally executed, meanwhile, the installation space of the actuator is very limited, the electromechanical actuator and the hydraulic actuator of the common actuator are used, and the emergency mode of the electromechanical actuator is complex; the axial length of the hydraulic actuator in the existing mode is longer, so that the installation is not facilitated, meanwhile, the emergency mode is mostly a pneumatic mode, and a special air source is required to be equipped. At present, an electromechanical actuator serving as a transmission mechanism has a function of being driven to rotate according to an instruction after being electrified. The process from the motor of the electromechanical actuator to the rudder shaft of the aircraft is a speed-reducing and moment-increasing process. Accordingly, it is desirable to mount a corresponding locking device on the motor shaft of the electromechanical actuator when it is not energized to provide the desired locking torque after deceleration and torque multiplication. Because the landing gear of modern aircraft is usually retractable, normally utilize hydraulic pressure to receive and release the landing gear, when the landing gear can't normally put down because of the trouble of aircraft hydraulic pressure, electrical system etc. system, the aircraft must have the measure of manual emergency landing gear, and its working property directly influences the security of aircraft. However, in the past, a plurality of aircraft landing gear emergency release cases are not in place, so that the aircraft is forced to descend, and the landing gear emergency release system is extremely important for ensuring the flight safety. In certain applications with high safety requirements, such as electromechanical actuators for retraction of aircraft landing gear, it is required that they must have a certain safety margin. The redundancy of the common electromechanical actuator is designed as a backup motor, and when the main motor fails, the backup motor works to realize emergency lowering or recovery of the piston cylinder. The conventional dual-redundancy electromechanical actuator still needs to rely on electric power to realize emergency retraction, has certain potential safety hazards, and is low in safety and task reliability, so that the practicability is poor.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides the scheme which has the advantages of simple structure, simplicity, compactness, reliable performance, small occupied space, capability of guaranteeing the flight safety of an airplane, no dependence on emergency unlocking of electric power and extension of the piston cylinder, so as to effectively solve the problem that the conventional dual-redundancy electromechanical actuator still needs to rely on the electric power to realize emergency retraction, realize the redundancy emergency of different working mediums, and provide the emergency unlocking extension electromechanical actuator.

The technical scheme adopted for solving the technical problems is as follows: an extended electromechanical actuator with emergency unlocking, comprising: the device is characterized by comprising a servo motor, a gear transmission mechanism in a sealing cavity of an outer cylinder 1 of an electromechanical actuator, a screw transmission pair 8 assembled in the transmission cavity of the outer cylinder 1 and meshed with the gear transmission mechanism, a piston cylinder 6 which stretches out and draws back the outer cylinder 1, and a screw nut 7 which is sealed in a hollow stepped hole of a piston head in a ring, and the device comprises the following components: the servo motor 11 is connected with a gear transmission mechanism through a clutch 12 shaft to drive a lead screw gear to rotate, a bearing is packaged through an outer barrel bottom step hole by a lead screw transmission pair 8, a hollow thread raceway in a lead screw nut 7 passes through a piston barrel 6 spacer ring to point to the bottom end of a hollow cavity, the lead screw nut 7 is sealed on an end cover sliding sleeve 10 on the end face of a fixed end step ring through a ring, a return spring 9 is restrained in the hollow step hole of a piston head, the lower end of a steel ball lock 4 uniformly distributed along the circumference is sleeved, an upper locking groove 3 positioned on the inner wall of the outer barrel 1 locks the steel ball lock 4 in a guide groove 5 of the piston head, during emergency operation, the clutch 12 is disengaged, a high-pressure medium enters the cavity of the outer barrel 1 through an emergency energy inlet 2 on the outer ring surface of the outer barrel 1 to form a closed loop emergency circuit for pushing the end cover sliding sleeve 10 to overcome the elasticity of the return spring 9, the closed loop emergency circuit high-pressure medium pushes the front end surface of the end cover sliding sleeve 10 to the steel ball lock limit of the end face of the piston head hollow step hole, the steel ball lock 4 rolls inwards along the guide groove 5, and is separated from the upper locking groove 3, and the steel ball lock is unlocked.

Compared with the prior art, the utility model has the following gain effects:

the utility model adopts the gear transmission mechanism which is connected with the sealing cavity of the outer cylinder 1 of the electromechanical actuator through the shaft connecting disc, the screw transmission pair 8 which is assembled in the transmission cavity of the outer cylinder 1 and meshed with the gear transmission mechanism, and the piston cylinder 6 which moves in a telescopic way in the outer cylinder 1, and has the advantages of simple structure, reliable performance, high mechanical strength and capability of bearing larger stable load and dynamic load. The vibration of the machine can be reduced, the noise can be reduced, and the working environment can be improved.

According to the utility model, a servo motor 11 is adopted to drive a lead screw gear to rotate through a clutch 12 shaft connecting disc gear transmission mechanism, a lead screw passes through a hollow thread raceway of a lead screw nut 7 assembled by a hollow stepped hole of a piston head, and passes through a piston cylinder 6 to be directed to the bottom of a cavity, the lead screw nut 7 is sealed in the hollow stepped hole of the piston head in a ring mode, and a return spring 9 is restrained in the hollow stepped hole of the piston head through an end cover sliding sleeve 10 sealed on the end face of the stepped ring of a fixed end in a ring mode, and is limited in the inner ring of a steel ball lock 4, and an upper locking groove 3 positioned on the inner wall of an outer cylinder 1 locks the steel ball lock 4 in a guide groove 5 of the piston head, so that the structure is compact and the occupied space is small.

According to the utility model, the corresponding sealing structure is designed for the inner circle and the outer circle of the end cover sliding sleeve 10, so that the mechanical lock of the electromechanical actuator steel ball lock 4 can be driven by emergency media to be opened, the emergency media entering the actuator can drive the steel ball lock 4 to mechanically lock and unlock the piston cylinder 6 when emergency operation is required, and the problem that the conventional electromechanical actuator has no multi-media emergency operation is solved.

According to the utility model, a high-pressure medium enters the cavity of the outer cylinder 1 through the emergency energy inlet 2 on the outer ring surface of the outer cylinder 1, the end cover sliding sleeve 10 is pushed to overcome the elasticity of the return spring 9 and separate from the lower end of the steel ball lock 4, so that the steel ball lock 4 is mechanically unlocked, the high-pressure medium pushes the piston cylinder 6 to drive the screw nut 7, the screw transmission pair 8 is reversely driven to rotate, and meanwhile, the piston cylinder 6 extends out, so that the traditional emergency unlocking mode of the actuator cylinder is changed, the control system and structure of the actuator cylinder are simplified, serious disastrous accidents of equipment caused by incapability of opening the mechanical lock in the actuator cylinder are avoided, and the safety of the landing gear retraction or opening and closing mechanism is improved. Meanwhile, by designing corresponding sealing structures for the inner circle and the outer circle of the end cover sliding sleeve 10, the mechanical lock of the electromechanical actuator can be driven by emergency media to be opened, so that when emergency operation is required, the emergency media entering the actuator can drive the mechanical lock to unlock, and the piston cylinder 6 extends out, and the problem that the conventional electromechanical actuator does not have multi-media emergency operation is solved.

According to the utility model, the piston cylinder 6 is pushed by a high-pressure medium to drive the screw nut 7, the screw transmission pair 8 is reversely driven to rotate, the piston cylinder 6 extends out, and the problem that the conventional dual-redundancy electromechanical actuator still needs to rely on electric power to realize emergency retraction under the power-losing working condition of the actuator is effectively solved.

Drawings

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily practice the present utility model. It should be noted, however, that the utility model is not limited to the embodiments but can be implemented in many other ways. In the drawings, non-relevant portions of the specification are omitted to simplify the description, like reference numerals designate like parts throughout.

FIG. 1 is a schematic view of the structure of the utility model in a locked state with an emergency unlocking extension electromechanical actuator.

In the figure: the emergency energy source device comprises an outer cylinder 1, an emergency energy source inlet 2, an upper locking groove 3, a steel ball lock 4, a guide groove 5, a piston cylinder 6, a screw nut 7, a screw transmission pair 8, a return spring 9, an end cover sliding sleeve 10, a servo motor 11 and a clutch 12.

The utility model will be further described with reference to the drawings and examples, without thereby restricting the utility model to the scope of the examples. All such concepts should be considered as being generic to the disclosure herein and to the scope of the utility model.

Detailed Description

Reference is made to fig. 1. In a preferred embodiment described below, a system with emergency unlocking of a protruding electromechanical actuator comprises: the device is characterized in that the device comprises a gear transmission mechanism which is connected with a gear through a servo motor shaft and is arranged in a sealing cavity of an outer cylinder 1 of an electromechanical actuator, a screw transmission pair 8 which is assembled in the transmission cavity of the outer cylinder 1 and is meshed with the gear transmission mechanism, a piston cylinder 6 which stretches out and draws back in the outer cylinder 1, and a screw nut 7 which is sealed in a hollow stepped hole of a piston head in a ring way, and the device is characterized in that: the servo motor 11 is connected with a gear transmission mechanism through a clutch 12 shaft to drive a lead screw gear to rotate, a bearing is packaged through an outer barrel bottom step hole by a lead screw transmission pair 8, a hollow thread raceway in a lead screw nut 7 passes through a piston barrel 6 spacer ring to point to the bottom end of a hollow cavity, the lead screw nut 7 is sealed on an end cover sliding sleeve 10 on the end face of a fixed end step ring through a ring, a return spring 9 is restrained in the hollow step hole of a piston head, the lower end of a steel ball lock 4 uniformly distributed along the circumference is sleeved, an upper locking groove 3 positioned on the inner wall of the outer barrel 1 locks the steel ball lock 4 in a guide groove 5 of the piston head, during emergency operation, the clutch 12 is disengaged, a high-pressure medium enters the cavity of the outer barrel 1 through an emergency energy inlet 2 on the outer ring surface of the outer barrel 1 to form a closed loop emergency circuit for pushing the end cover sliding sleeve 10 to overcome the elasticity of the return spring 9, the closed loop emergency circuit high-pressure medium pushes the front end surface of the end cover sliding sleeve 10 to the steel ball lock limit of the end face of the piston head hollow step hole, the steel ball lock 4 rolls inwards along the guide groove 5, and is separated from the upper locking groove 3, and the steel ball lock is unlocked.

In the emergency unlocking of the steel ball lock, the high-pressure medium pushes the piston cylinder 6 to drive the screw nut 7 to reversely drive the screw transmission pair 8 to rotate, meanwhile, the piston cylinder 6 stretches out in an emergency mode, and the tasks of unlocking and stretching out the piston cylinder are completed under the working condition that the actuator is powered off.

During normal operation, the screw nut 7 is driven by the rotating screw transmission pair 8, the end cover sliding sleeve 10 is pushed by the tail end step of the screw nut 7 to overcome the elasticity of the reset spring 9 to separate from the lower end of the steel ball lock 4, the steel ball lock 4 rolls inwards along the radial direction of the guide groove 5, and the piston cylinder 6 stretches out after separating from the upper locking groove 3.

The screw nut 7 is sealed through an end cover sliding sleeve 10 on the end face of the fixed end step ring, the reset spring 9 is restrained in the hollow step hole of the piston head, and the degree of freedom of the steel ball lock 4 in the annular groove in the guide groove 5 is limited.

An upper locking groove 3 on the inner wall of the outer cylinder 1 locks the steel ball lock 4 in a guide groove 5 of the piston head.

According to any of the above exemplary embodiments, when the piston cylinder 6 is retracted to the bottom end, the steel ball lock 4 is positioned in the upper locking groove 3 and the guide groove 5 on the inner surface of the outer cylinder 1, and the lower end is abutted against the outer annular surface of the end cover sliding sleeve 10, locking is achieved.

When the emergency unlocking is needed and the piston cylinder extends out, high-pressure emergency medium enters the inner cavity of the outer cylinder 1 of the electromechanical actuator from the emergency energy inlet 2, the end cover sliding sleeve 10 is pushed to overcome the elastic force of the return spring 9, the steel ball lock 4 is separated from the upper end of the steel ball lock 4, and the steel ball lock 4 is separated from the upper locking groove 3, so that the piston cylinder 6 is separated from the outer cylinder 1; meanwhile, the high-pressure emergency medium pushes the pushing piston cylinder 6 to extend out, and drives the screw nut 7 to reversely drive the screw transmission pair 8 to rotate.

For reference, in the description of the exemplary embodiment, the steel ball lock 4 is installed in the guide groove 5 of the piston cylinder 6, the upper end of the steel ball lock is installed in the upper locking groove 3 of the outer cylinder 1, which is equivalent to the steel ball lock 4 in diameter, and the lower end of the steel ball lock is abutted against the outer annular surface of the end cover sliding sleeve 10. The end cover sliding sleeve 10 is pushed by the screw nut 7, and moves together against the elastic force of the reset spring 9 to lock or unlock the mechanical lock, and when the steel ball lock 4 is positioned in the upper locking groove 3 of the outer cylinder 1 and the lower end leans against the outer ring surface of the end cover sliding sleeve 10, the mechanical lock locks.

When unlocking, the screw nut 7 drives the end cover sliding sleeve 10 to separate from the lower end of the steel ball lock. When the emergency unlocking is needed and the piston cylinder is extended, the clutch 12 is separated from the servo motor 11, high-pressure medium enters the electromechanical actuator from the emergency energy inlet 2, the high-pressure medium pushes the end cover sliding sleeve 10 to be separated from the lower end of the steel ball lock 4 against the elastic force of the return spring 9, the mechanical lock unlocking is realized, the high-pressure medium pushes the piston cylinder 6 to drive the screw nut 7, the screw 8 is reversely driven to rotate, and meanwhile, the piston cylinder 6 is extended.

When the driving servo motor fails, the clutch can transmit the output torque of the motor to the output executing mechanism through friction, and the servo motor can be separated from the output executing mechanism through the clutch, so that the failure is isolated.

While embodiments of the present utility model have been illustrated and described above, the embodiments of the present utility model have been described in detail, and the description of the embodiments is only for aiding in the understanding of the present utility model; also, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is not to be construed as limited by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (6)

1. An extended electromechanical actuator with emergency unlocking, comprising: the device is characterized by comprising a servo motor, a gear transmission mechanism in a sealing cavity of an outer cylinder (1) of an electromechanical actuator, a screw transmission pair (8) assembled in the transmission cavity of the outer cylinder (1) and meshed with the gear transmission mechanism, a piston cylinder (6) which stretches out and draws back in the outer cylinder (1) and a screw nut (7) with a ring sealed in a hollow stepped hole of a piston head, and the device comprises the following components: the servo motor (11) is connected with a gear transmission mechanism through a clutch (12) shaft to drive a screw gear to rotate, a screw transmission pair (8) encapsulates a bearing through an outer cylinder bottom step hole and an empty thread rolling way in a screw nut (7), the empty thread rolling way penetrates through a piston cylinder (6) spacer ring to point to the bottom end of a hollow cavity, the screw nut (7) is sealed in an end cover sliding sleeve (10) on the end face of a fixed end step ring through a ring, a reset spring (9) is restrained in a hollow step hole of a piston head, the lower end of a steel ball lock (4) which is uniformly distributed along the circumference is sleeved, and an upper locking groove (3) positioned on the inner wall of the outer cylinder (1) locks the steel ball lock (4) in a guide groove (5) of the piston head.

2. The extended electromechanical actuator with emergency unlocking according to claim 1, wherein: the screw nut (7) is sealed through an end cover sliding sleeve (10) on the end face of the fixed end step ring, the reset spring (9) is restrained in the hollow step hole of the piston head, and the degree of freedom of the steel ball lock (4) in the annular groove in the guide groove (5) is limited.

3. The extended electromechanical actuator with emergency unlocking according to claim 1, wherein: an upper locking groove (3) positioned on the inner wall of the outer cylinder (1) locks the steel ball lock (4) in a guide groove (5) of the piston head.

4. The extended electromechanical actuator with emergency unlocking according to claim 1, wherein: the steel ball lock (4) is arranged in the guide groove (5) of the piston cylinder (6), the upper end of the steel ball lock is arranged in the upper lock groove (3) of the outer cylinder (1) with the diameter equal to that of the steel ball lock (4), and the lower end of the steel ball lock is leaned against the outer ring surface of the end cover sliding sleeve (10).

5. The emergency unlocking extended electromechanical actuator according to claim 4, wherein: the end cover sliding sleeve (10) is pushed by the screw nut (7) to move together against the elastic force of the return spring (9) so as to lock or unlock the mechanical lock, the steel ball lock (4) is positioned in the upper locking groove (3) of the outer cylinder (1), the lower end of the steel ball lock is leaned against the outer ring surface of the end cover sliding sleeve (10), and the mechanical lock is locked.

6. The extended electromechanical actuator with emergency unlocking according to claim 1, wherein: when unlocking, the screw nut (7) drives the end cover sliding sleeve (10) to separate from the lower end of the steel ball lock.