Transmission mechanism of aircraft gimbal

Abstract

A transmission device for an aircraft gimbal includes a fixed housing, and an AZ-axis transmission unit, an EL-axis transmission unit, and a payload mount mounted on the fixed housing. The AZ-axis transmission unit is pivotally connected to the fixed housing via a cylindrical base and drives the cylindrical base to perform horizontal rotation relative to the ground surface. The EL-axis transmission unit and the payload mount are mounted on the cylindrical base and rotate accordingly. The payload mount is driven by the EL-axis transmission unit to perform pitch movement relative to the ground surface, thereby carrying a payload and adjusting the relative position between the payload and a ground target. Accordingly, the EL-axis transmission unit has the advantages of self-locking and energy saving, reducing parts, facilitating assembly, and reducing structural volume.

Claims

1. A transmission device for an aircraft gimbal, comprising: A fixed housing is mounted on an aircraft and forms an XY plane; an AZ-axis drive unit includes a cylinder base and an AZ-axis drive mechanism, the cylinder base being pivotally connected to the fixed housing along an AZ-axis as its rotation center, the AZ-axis drive mechanism being mounted on the fixed housing to drive the rotation of the cylinder base, and the AZ-axis being perpendicular to a ground surface; an EL-axis drive unit is mounted on one side of the cylinder base along an EL-axis as its rotation center, and the EL-axis is perpendicular to the AZ-axis and parallel to the XY plane; a payload seat is pivotally connected to a bottom of the cylinder base along the EL-axis as its rotation center, the payload seat being driven by the EL-axis drive unit to perform pitch motion relative to the ground surface, and being driven by the AZ-axis drive mechanism to perform horizontal rotation motion relative to the ground surface; wherein, the EL-axis drive unit includes: at least one pivot support connected to the bottom of the cylinder base, the payload... The base is pivotally connected to the bottom of the cylindrical base via the pivot support; and an EL-axis reducer is mounted on one side of the pivot support and includes at least one fixed internal gear ring, at least one movable internal gear ring, a plurality of planetary gears, a sun gear, and an EL-axis motor; wherein the number of fixed internal gear rings and the number of movable internal gear rings differ by one and are concentrically staggered along the EL-axis, the planetary gears respectively mesh with the fixed internal gear rings and the movable internal gear rings in a segmented manner, the sun gear receives the drive of the EL-axis motor and meshes with the planetary gears in the segmented manner, the number of segments in the segmented manner is equal to the total number of fixed internal gear rings and movable internal gear rings, one end of the movable internal gear ring is fixed to the load base, and the EL-axis reducer drives the load base to perform the pitching motion via the movable internal gear ring.

2. The transmission device of the aircraft gimbal as described in claim 1, wherein the AZ-axis transmission includes a large gear fixed to the outer wall of the cylinder, a small gear meshing with the large gear, a worm gear connected in series on the axle of the small gear, a worm gear meshing with the worm gear, and an AZ-axis motor driving the worm gear, wherein the worm gear is driven by the AZ-axis motor to sequentially drive the worm gear, the small gear and the large gear to rotate, thereby driving the cylinder to rotate along the AZ-axis.

3. The transmission device of the aircraft gimbal as claimed in claim 1, wherein the pivot support has a pivot portion pivotally connected to a pivot arm for connecting the payload seat, and the movable internal gear ring drives the payload seat to perform the pitch motion via the pivot arm.

4. The transmission device of the aircraft gimbal as described in claim 1, wherein when there is a plurality of fixed internal gear rings, the tooth profiles of the fixed internal gear rings overlap on the projection of the EL axis.

5. The transmission device of the aircraft gimbal as described in claim 1 or 4, wherein the fixed internal gear ring and the movable internal gear ring have the same number of teeth.

6. The transmission device of the aircraft gimbal as claimed in claim 1, wherein the fixed internal gear ring is connected to the shaft support to guide the planetary gear to revolve and rotate around the EL axis.

7. The transmission device of the aircraft gimbal as claimed in claim 6, wherein one end of the rotating shaft support forms a platform, and the fixed internal gear ring is connected to the rotating shaft support via the platform.

Images