CN107781370B

CN107781370B - Safety rocker arm for reverse thrust deformation protection

Info

Publication number: CN107781370B
Application number: CN201610727643.5A
Authority: CN
Inventors: 杨晔; 刘赛遥; 姚成法; 陈辉; 雷朝
Original assignee: Xian Flight Automatic Control Research Institute of AVIC
Current assignee: Xian Flight Automatic Control Research Institute of AVIC
Priority date: 2016-08-25
Filing date: 2016-08-25
Publication date: 2020-06-09
Anticipated expiration: 2036-08-25
Also published as: CN107781370A

Abstract

The invention relates to a safety rocker arm with reverse thrust deformation protection, which comprises an output shaft (1), a limiting cover (2), a torsion spring (3), a copper bush (4), an output rocker arm (5), a copper washer (6), a slotted hexagon nut (7) and a cotter pin (8), wherein the safety rocker arm is arranged at one end of the output shaft (1), the limiting cover (2) is connected with the output shaft (1) through a key, the copper bush (4) is positioned between the cylindrical surface of the output shaft (1) and an inner hole of the output rocker arm (5), and two ends of the torsion spring (3) are respectively connected with holes which are uniformly distributed in the circumferential direction of the output rocker arm (5) through the limiting cover (2); the end part of the output shaft (1) is connected with a slotted hexagonal nut (7) and a cotter pin (8), and a copper washer (6) is positioned between the limiting cover (2) and the slotted hexagonal nut (7). The problem of reverse thrust deformation on the machine is effectively solved, and the manipulation safety of the electromechanical actuator is effectively protected.

Description

Safety rocker arm for reverse thrust deformation protection

Technical Field

The invention belongs to the aerospace technology, and particularly relates to a novel safety rocker arm with reverse thrust deformation protection.

Background

The electromechanical actuator is more and more applied to the aerospace fields such as guided missiles, unmanned planes, spacecrafts and the like due to simple structure, good manufacturability, high reliability and convenient maintenance. As the aircraft is continuously developed to high speed and high maneuverability and the application field of the electromechanical actuator is continuously widened, the use environments of high acceleration, high impact, strong vibration and the like also put higher requirements on the electromechanical actuator.

When the aircraft is in large-power movement and large-force movement, the whole structure of the engine can deform, and an electromechanical actuator arranged near the engine can be subjected to large reverse thrust, so that the electromechanical actuator is damaged after long-term use, and the flight safety is seriously influenced.

Disclosure of Invention

The technical problems to be solved by the invention are as follows:

in order to solve the problem that the structure of the electromechanical actuator is damaged by large reverse thrust when the aircraft makes large maneuvering and large force application movement, the safety rocker arm of the electromechanical actuator is simple in structure, high in reliability and capable of protecting deformation of the reverse thrust.

The technical scheme of the invention is as follows:

a novel reverse thrust deformation protection safety rocker arm comprises an output shaft 1, a limiting cover 2, a torsion spring 3, a copper bush 4, an output rocker arm 5, a copper washer 6, a slotted hexagon nut 7 and a split pin 8. The safety rocker arm is installed in one of output shaft 1 and serves, and spacing lid 2 links to each other with output shaft 1 through the key, and copper bush 4 is located and output shaft 1 face of cylinder and between 5 holes of rocking arm, and the both ends of torsional spring 3 link to each other through the hole of

spacing lid

2 and 5 upwards equipartitions of output rocking arm respectively. The end part of the output shaft 1 is connected with a slotted hexagon nut 7 and a cotter pin 8, and a copper gasket 6 is positioned between the limiting cover 2 and the slotted hexagon nut 7.

Insert spacing lid 2 and output rocker arm 5 circumference equipartition with 3 both ends of torsional spring in the hole, the boss of spacing lid 2 inserts output rocker arm 5 tip U type groove, and the boss leans on in the one end in U type groove closely, makes the torsional spring produce certain pretightning force, and when big thrust warp and make the moment of torsion on the output rocker arm 5 be greater than the pretightning force, the boss of spacing lid 2 removed in output rocker arm 5 tip U groove, and output rocker arm 5 suitably gives up, has effectively protected electromechanical actuator.

The invention has the beneficial effects that:

the torsion spring 3 with certain load torque is preset in the output rocker arm 5, and the pre-tightening torque value is larger than the maximum load of the electromechanical actuator, so that the output rocker arm 5 and the output shaft 1 keep normal synchronous motion by the pre-tightening torque during normal work; when the engine thrust deforms to enable the torque on the output rocker arm 5 to be larger than a preset value, the torsion spring is further compressed, and the output rocker arm 5 appropriately retreats and rotates relative to the output shaft 1. The safety rocker arm effectively solves the problem of reverse thrust deformation on the machine and effectively protects the operation safety of the electromechanical actuator.

Drawings

FIG. 1 is a design block diagram of the patent;

Detailed Description

The technical scheme of the invention is described in detail by combining the figure 1:

the structure comprises an output shaft 1, a limiting cover 2, a torsion spring 3, a copper bush 4, an output rocker arm 5, a copper washer 6, a slotted hexagon nut 7 and a cotter pin 8.

Spacing lid 2 links to each other with output shaft 1 through the key, and copper bush 4 is located and output shaft 1 face of cylinder and the rocking arm hole between, and the both ends of torsional spring 3 link to each other through the hole of

spacing lid

2 and 5 upwards equipartitions of output rocking arm circumference respectively. The end part of the output shaft 1 is connected with a slotted hexagon nut 7 and a cotter pin 8, and a copper gasket 6 is positioned between the limiting cover 2 and the slotted hexagon nut 7.

During the installation, through twisting torsional spring 3 deformation, make torsional spring 3 produce certain pretightning force, insert spacing lid 2 and the hole of 5 upwards equipartitions of output rocking arm in week with 3 both ends of torsional spring, adjust the pretightning force through the hole of selecting different positions on 3 male spacing lids of torsional spring 2 and the output rocking arm 5, the torque value of this pretension is greater than electromechanical actuator's maximum load, after the safety rocker arm is installed, the U type boss of spacing lid 2 inserts in 5 tip U grooves of output rocking arm, the boss is close to the one end at U groove. Therefore, when the device works normally, the output rocker arm 5 and the output shaft 1 keep normal synchronous motion by the pre-tightening torque; when the large thrust deforms to enable the torque on the output rocker arm 5 to be larger than the pretightening force, the boss of the limiting cover 2 moves in the U groove at the end part of the output rocker arm 5, and the output rocker arm 5 appropriately retreats to rotate relative to the output shaft 1. The safety rocker arm effectively solves the problem of reverse thrust deformation on the machine and protects the operation safety of the electromechanical actuator.

Claims

1. The utility model provides a safe rocking arm of thrust reversal deformation protection, includes output shaft (1), spacing lid (2), torsional spring (3), copper bush (4), output rocking arm (5), copper packing ring (6), fluting hexagon nut (7), split pin (8), its characterized in that: the safety rocker arm is arranged at one end of the output shaft (1), the limiting cover (2) is connected with the output shaft (1) through a key, the copper bush (4) is positioned between the cylindrical surface of the output shaft (1) and an inner hole of the rocker arm, and two ends of the torsion spring (3) are respectively connected with holes which are uniformly distributed in the circumferential direction of the output rocker arm (5) through the limiting cover (2); the end part of the output shaft (1) is connected with a slotted hexagon nut (7) and a cotter pin (8), and a copper washer (6) is positioned between the limiting cover (2) and the slotted hexagon nut (7); during installation, the torsion spring (3) is deformed by twisting, so that the torsion spring (3) generates a certain pretightening force, two ends of the torsion spring (3) are inserted into holes which are uniformly distributed on the circumferential direction of the limiting cover (2) and the output rocker arm (5), and the pretightening force is adjusted by selecting the holes which are arranged at different positions on the limiting cover (2) and the output rocker arm (5) and into which the torsion spring is inserted; after the safety rocker arm is installed, a U-shaped boss of the limiting cover (2) is inserted into a U-shaped groove at the end part of the output rocker arm (5), and the boss is tightly close to one end of the U-shaped groove; when the device works normally, the output rocker arm (5) and the output shaft (1) keep normal synchronous motion by the pre-tightening torque; when the large thrust deforms to enable the torque on the output rocker arm (5) to be larger than the pretightening force, the boss of the limiting cover (2) moves in the U groove at the end part of the output rocker arm (5), and the output rocker arm (5) appropriately retreats and rotates relative to the output shaft (1).