Transmission device for base station antenna and base station antenna

Patent metadata

Field	Value
Publication number	US-12519224-B2
Application number	US-202318304803-A
Country	US
Kind code	B2
Filing date	Apr 21, 2023
Priority date	May 6, 2022
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A transmission device for a base station antenna includes a motor, a screw driven by the motor, a transmission shaft, and a linkage system. The linkage system is connected with the screw via the transmission shaft, so that the screw drives the linkage system via the transmission shaft. The linkage system includes: a worm driven by the transmission shaft, a worm gear meshed with the worm, at least one spur gear disposed on a same connecting shaft as the worm gear, and at least one connecting rod engagement element. The spur gear and the worm gear are fixed relative to each other. The connecting rod engagement element has a rack meshed with the spur gear, so that the worm drives the worm gear to rotate with the spur gear, and the spur gear drives the connecting rod engagement element via the rack to move in an axial direction of the transmission shaft.

First claim

The invention claimed is:

1 . A transmission device for a base station antenna, comprising:
a motor; a screw coupled to the motor; a transmission shaft; and a linkage system coupled to the screw via the transmission shaft, such that the screw is configured to drive the linkage system via the transmission shaft, the linkage system comprises:
a worm coupled to the transmission shaft;
a worm gear meshed with the worm;
at least one spur gear disposed on a same connecting shaft as the worm gear; and
at least one connecting rod engagement element,
wherein the spur gear and the worm gear are fixedly disposed relative to each other and the connecting rod engagement element has a rack meshed with the spur gear, such that the worm is configured to drive the worm gear to rotate with the spur gear, and the spur gear is configured to drive the connecting rod engagement element via the rack to move in an axial direction of the transmission shaft,
wherein an axis of rotation of the transmission shaft is coaxial to an axis of rotation of the screw, and wherein the worm has a shaft bore for connection with the transmission shaft, an inner surface of the shaft bore has a polygonal structure, the transmission shaft at least partially has a polygonal portion for embedding into the shaft bore, and the polygonal portion is configured to mate with the polygonal structure of the inner surface of the shaft bore to define the worm in a zero position when the transmission device is assembled.

2 . The transmission device according to claim 1 , wherein the connecting rod engagement element comprises a restriction slot configured to receive a restriction element when the transmission device is assembled, in order to position the connecting rod engagement element in the zero position.

3 . The transmission device according to claim 1 , wherein a diameter ratio of the worm gear to the spur gear is greater than 1.

4 . The transmission device according to claim 1 , wherein the shaft bore of the worm has a decagonal inner surface, and the polygonal portion of the transmission shaft has a decagonal outer surface that is configured to mate with the inner surface of the shaft bore of the worm.

5 . The transmission device according to claim 1 , wherein the polygonal portion extends over an entire axial length of the transmission shaft.

6 . The transmission device according to claim 2 , wherein the restriction slot extends transversely to a movement direction of the connecting rod engagement element.

7 . The transmission device according to claim 1 , wherein the transmission device comprises a plurality of connecting rod engagement elements configured to move synchronously with each other in the axial direction of the transmission shaft under driving of the spur gear.

8 . The transmission device according to claim 3 , wherein the diameter ratio of the worm gear to the spur gear is 1.5.

9 . The transmission device according to claim 1 , wherein the transmission device has even number of spur gears, and the even number of spur gears are mirrored on both sides of the worm gear with respect to the worm gear.

10 . The transmission device according to claim 1 , wherein the connecting shaft has a polygonal cross-section, and inner surfaces of shaft bores of the worm gear and the spur gear for receiving the connecting shaft each have a polygonal structure that is configured to mate with the cross-section of the connecting shaft, such that the spur gear is configured to rotate synchronously with the worm gear via the connecting shaft.

11 . A transmission device for a base station antenna, comprising:
a motor; a screw coupled to the motor; a transmission shaft; and a linkage system coupled to the screw via the transmission shaft, such that the screw is configured to drive the linkage system via the transmission shaft, the linkage system comprises:
a worm driven by coupled to the transmission shaft;
a worm gear meshed with the worm;
a plurality of spur gears disposed on a same connecting shaft as the worm gear; and
a plurality of connecting rod engagement elements,
wherein the spur gears and the worm gear are fixedly disposed relative to each other and each of the connecting rod engagement elements has a rack meshed with a respective spur gear, such that the worm is configured to drive the worm gear to rotate with the spur gears, and the spur gears are configured to drive the connecting rod engagement elements via the rack to move in an axial direction of the transmission shaft,
wherein each connecting rod engagement element comprises a restriction slot configured to receive an elongated restriction element when the transmission device is assembled, in order to simultaneously position each connecting rod engagement element in a zero position.

12 . The transmission device according to claim 11 , wherein each connecting rod engagement element comprises two connecting rod engagement half bodies, the rack is provided between the two connecting rod engagement half bodies and is configured to connect the two connecting rod engagement half bodies, each connecting rod engagement half body has two feet extending along a movement direction of the connecting rod engagement element, and the two feet extend away from each other from a region in which the rack is located.

13 . The transmission device according to claim 12 , wherein, in an assembly position of the connecting rod engagement element, the restriction slot is configured in a same position of a foot on a same side of each of all the connecting rod engagement half bodies.

14 . The transmission device according to claim 11 , wherein the worm has a shaft bore for connection with the transmission shaft, an inner surface of the shaft bore has a polygonal structure, the transmission shaft at least partially has a polygonal portion for embedding into the shaft bore, and the polygonal portion is configured to mate with the polygonal structure of the inner surface of the shaft bore to define the worm in the zero position when the transmission device is assembled.

15 . The transmission device according to claim 11 , wherein a diameter ratio of the worm gear to the spur gear is greater than 1.

16 . A base station antenna, wherein the base station antenna comprises the transmission device according to claim 1 .

17 . A transmission device for a base station antenna, comprising:
a motor; a screw coupled to the motor; a transmission shaft; and a linkage system coupled to the screw via the transmission shaft, such that the screw is configured to drive the linkage system via the transmission shaft, the linkage system comprises:
a worm coupled to the transmission shaft;
a worm gear meshed with the worm;
at least one spur gear disposed on a same connecting shaft as the worm gear; and
at least one connecting rod engagement element,
wherein the spur gear and the worm gear are fixedly disposed relative to each other and the connecting rod engagement element has a rack meshed with the spur gear, such that the worm is configured to drive the worm gear to rotate with the spur gear, and the spur gear is configured to drive the connecting rod engagement element via the rack to move in an axial direction of the transmission shaft,
wherein the worm has a shaft bore for connection with the transmission shaft, an inner surface of the shaft bore has a polygonal structure, the transmission shaft at least partially has a polygonal portion for embedding into the shaft bore, and the polygonal portion is configured to mate with the polygonal structu

Assignees

• Outdoor Wireless Networks LLC

Inventors

• Shao Shuguang
• Wang Yiding
• Tang Puliang

Classifications

• H01Q1/46

  Electric supply lines or communication lines · CPC title

• H01Q3/005

  using remotely controlled antenna positioning or scanning · CPC title

• H01Q3/32 Primary

  by mechanical means · CPC title