Electrical driving mechanism for sonic flying devices

Abstract

The invention describes the electrical driving mechanism for sonic flying device in, on small airplane, UAV, Aerial observation equipment, includes: electric actuator, the first rotary shaft, the second rotary shaft, piston, cylinder cover, spring, fin, pin. The electric actuator are composed of three main parts including speed reducing gearbox, ball screw, motor, cover. The speed reducing gearbox is composed of spur gears and planetary gears. The electric actuator has small size, can be operated in high temperature, has water resistance, vibration resistance, big load, high speed, is suitable for sonic flying device and meets with working conditions.

Claims

1. An electric actuator pulls and pushes one end of a rotary shaft rotating around at a turning point and another end of the rotary shaft pulls and pushes a piston; a turning point of the rotary shaft is constrained five degrees of freedom with a body of an aerial vehicle; The piston slides inside the a cylinder cover, transfers pulling and pushing force to a cylinder cover through a spring having ends; The piston and cylinder cover are put inside the spring; The spring ends are fixed with the piston and the cylinder cover; The Cylinder cover pulls and pushes one end of a second rotary shaft to rotate it around a turning point which is concentric with a shaft of the aerial vehicle fin and is constrained five degrees of freedom with the body of aerial vehicle.

2. An electric actuator combines an electric motor, a gear box and a set of a screw shaft and screw nut; The gearbox includes a spur gear set and a planet gear set; The spur gear set combines a driving gear connected directly to an motor output shaft, an intermediate gear and a driven gear; The driven gear is assembled with a shaft of sun gear of the planet gear set; a ring gear of the planet gear set is fixed with a gearbox cover by an inserted pin; a carrier of the planet gear set is fixed with the screw shaft; The screw nut is put inside a screw nut connecting shaft which has a hollow form; The screw shaft goes into a hole of the screw nut connecting shaft; a position sensor is fixed on a main frame of the electric actuator.

Description

DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 describes the electrical driving mechanism for sonic flying device;

[0019] FIG. 2 describes the vertical cross-section through the actuator center;

[0020] FIG. 3 describes the side view of the electric actuator;

[0021] FIG. 4 describes the side view of cross-section A-A in FIG. 2;

[0022] FIG. 5 describes the side view of cross-section B-B in FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

[0023] Referred to FIG. 1 to FIG. 5, the basic construction of this invention includes parts and are assembled together as follow:

[0024] The electric actuator (1) is a power source to control driving fins (7), it receives the commands from control center to control the fin. The first rotary shaft (2) and the second rotary shaft (6) are fixed with the flying device at the rotary center D and E. The rotary shafts are linked with the electric actuator (1) and the piston (3) by the pin (8); the piston (3) slides inside the spring (4) and cylinder cover (5). The pulling and pushing forces of piston (3) are converted into elastic force of spring (4), then transferred to cylinder cover (5). Reversely, the pulling and pushing forces of cylinder cover (5) are converted into elastic force of spring (4), then transferred to piston (3). The spring (4) works as the damping element in the system to prevent overload. Torque flow of the electric actuator (1) includes motor (1.21), gearbox and screw shaft-screw nut sets. Gearbox is a combination of spur gear sets and planet gear sets. The detail structure of electric actuator is as following:

[0025] Driving gear (1.1) is spur gear connected directly with motor (1.21). Intermediate gear (1.2) is assembled on the gearbox cover (1.11) and gearbox frame (1.12) through intermediate shaft bearing (1.18). Driven gear (1.3) is attached directly to main shaft (1.25) which is assembled on the gearbox cover (1.11) and gearbox frame (1.12).

[0026] Sun gear (1.4) is assembled tightly to the main shaft (1.25). Planet gears (1.5) are assembled between first carrier (1.26) and second carrier (1.27). Ring gear (1.6) is fixed with gearbox body (1.13) by inserted pins from outside. Driving screw (1.7) is multi section shaft connected with second carrier (1.27) and screw nut (1.8) to convert rotation of second carrier (1.27) into displacement of screw nut (1.8). Screw nut connecting shaft (1.20) is multi hollow-section shaft which is connected with screw nut (1.8) and intermediate shaft (1.9). The hollow section of screw nut connecting shaft (1.20) offers the space for the driving screw (1.7) going inside. A position sensor (1.22) is inserted on the frame to monitor the travel of screw nut connecting shaft (1.20). Intermediate shaft (1.9) connects screw nut connecting shaft (1.20) to clevis (1.10) and gives the connecting length adjustment ability by thread surface and bolts.

[0027] Gearbox cover (1.11) combines locating ears to be assembled to the aerial vehicle body and inner hubs for the bearing of driving gear (1.1), intermediate gear (1.2) and driven gear (1.3). Gearbox cover (1.11) is attached to gear box frame (1.12) to create space for spur gear set. The other side of gear box frame (1.12) is combined with gear box body (1.13) and gear box base (1.15) to make a frame and space for planet gear set. The sun gear (1.4) is attached to main shaft (1.25) which is held on a couple of bearing in the gear box cover (1.11) and gear box frame (1.12). The inner side of main body (1.16) includes hubs for driving screw bearing, motor (1.21) and hole thread for fasteners to assemble with main frame (1.17) and gear box base (1.15). The outer side of main body (1.16) is designed with multi air-cooling blades to increase the thermal transferring ability.

[0028] Motor (1.21) torque is transferred through driving gear (1.1), intermediate gear (1.2), driven gear (1.3) to the main shaft (1.25), then goes to the sun gear (1.4), planet gear (1.5), the first carrier (1.26) and second carrier (1.27), continuously to the driving screw (1.7) and screw nut (1.8), and is converted to displacement of screw nut (1.8), screw nut connecting shaft (1.20), intermediate shaft (1.9) and clevis (1.10).

POSSIBLE EFFECT OF THE INVENTION

[0029] The inventions relates to the electrical driving mechanism for sonic flying devices. Particularly, the integrated driving mechanism mentioned in this convention can be applied for flying devices such as sonic flight device, aerial observation equipment, unmanned aerial vehicle (UAV).

[0030] The electrical driving mechanism can be used for sonic flying devices can be operated at temperature of −30±100° C. and performs low power consumption, waterproof IP68, high stability. Its vibration resistance meets MIL-STD-810G standard.