CN110994315B

CN110994315B - Light and small integrated conductive sliding ring brush plate

Info

Publication number: CN110994315B
Application number: CN201911298783.5A
Authority: CN
Inventors: 宋万禄; 鄂瑞迪
Original assignee: Tianjin Jinhang Institute of Technical Physics
Current assignee: Tianjin Jinhang Institute of Technical Physics
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2021-10-15
Anticipated expiration: 2039-12-17
Also published as: CN110994315A

Abstract

The invention relates to a light and small integrated conductive slip ring brush plate, which comprises: the slip ring rotor is of a main supporting structure, the slip ring rotor is arranged in the middle of the base, and the bearing is sleeved on the slip ring rotor and fixed in the middle of the base; the slip ring gasket is arranged at the upper part of the bearing and sleeved with the slip ring rotor; the conductive slip ring is arranged on the upper side of the slip ring gasket and sleeved on the slip ring rotor; the wave spring is sleeved on the slip ring rotor and is not in contact with the slip ring rotor, the wave spring is used for supporting a bearing at the upper part of the slip ring rotor, the conductive slip ring pressing sheet is sleeved on the slip ring rotor, the cover plate presses the slip ring rotor, the cover plate is abutted against the wave spring, and the wave spring is in a compressed state in a normal state; a group of PCB rigid parts, PCB flexible parts and brush wires are respectively arranged on two sides of the slip ring and are connected to a PCB on the base through external connectors of the slip ring. According to the invention, through the design idea of mechanical and electrical integration, the requirements of structural support, power transmission and signal transmission are considered comprehensively, so that the size and weight of the brush plate are reduced; the number of parts of the slip ring is reduced; the assembly time of the slip ring is reduced.

Description

Light and small integrated conductive sliding ring brush plate

Technical Field

The invention belongs to the field of design of conductive slip rings of light and small pod. Relates to a light, small and electromechanical integrated conductive slip ring brush plate assembly.

Background

The small unmanned aerial vehicle has limited carrying capacity, so that the airborne pod is required to be light and small. The slip ring/slip ring brush plate assembly is an essential component of the nacelle, the bulk weight of which directly affects the bulk weight of the nacelle.

The brush plate component is a component part of the conductive slip ring and plays two roles of fixing brush wires (structural role) and leading out signals/current (electrical role).

Disclosure of Invention

The invention aims to provide a light and small integrated conductive slip ring brush plate, which is used for solving the problems in the prior art.

The invention relates to a light and small integrated conductive slip ring brush plate, which comprises: the device comprises a PCB flexible part, a conductive slip ring pressing sheet, a slip ring rotor, a slip ring external connector, a bearing, a slip ring gasket, a PCB rigid part, brush wires, a cover plate, a wave spring, a conductive slip ring and a base; the slip ring rotor is of a main supporting structure, the slip ring rotor is arranged in the middle of the base, and the bearing is sleeved on the slip ring rotor and fixed in the middle of the base; the slip ring gasket is arranged at the upper part of the bearing and sleeved with the slip ring rotor; the conductive slip ring is arranged on the upper side of the slip ring gasket and sleeved on the slip ring rotor; the wave spring is sleeved on the slip ring rotor and is not in contact with the slip ring rotor, the wave spring is used for supporting a bearing at the upper part of the slip ring rotor, the conductive slip ring pressing sheet is sleeved on the slip ring rotor, the cover plate presses the slip ring rotor, the cover plate is abutted against the wave spring, and the wave spring is in a compressed state in a normal state; a group of PCB rigid parts, PCB flexible parts and brush wires are respectively arranged on two sides of the slip ring and are connected to a PCB on the base through external connectors of the slip ring.

According to the embodiment of the light and small integrated conductive slip ring brush plate, the copper thickness of a PCB is 1oz, and the line width of a power printed line is more than 60 mil.

According to one embodiment of the light and small integrated conductive slip ring brush plate, brush wires are welded in two longitudinal rows of welding pads; the left bending area is a flexible part, and signals and current are input and output to the outside of the conductive slip ring through a gold finger.

According to the embodiment of the light and small integrated conductive slip ring brush plate, the conductive slip ring comprises two brush plate assemblies which are in mirror symmetry from left to right.

The invention adopts a rigid-flex PCB design method and uses the rigid part of the PCB to realize the structural support function of the traditional brush board, thereby playing the dual functions of fixing brush wires and transmitting signals; the flexible part of the PCB replaces the welding lead of the traditional brush board to output signals and current to the outside of the slip ring.

Drawings

FIG. 1 is a schematic view of a brush plate assembly (without brush filaments);

FIG. 2 is a schematic view of the brush plate assembly;

FIG. 3 is a schematic view of a brush plate assembly with a brush plate assembled;

FIG. 4 is a schematic view of the brush plate assembly with an external circuit mounted thereto.

Detailed Description

In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

Fig. 1 is a brush plate assembly (without brush wires), fig. 2 is a schematic view of a slip ring of the brush plate assembly, fig. 3 is a schematic view of a brush plate assembly assembled with a brush plate, fig. 4 is a schematic view of an external circuit of the brush plate assembly assembled with the brush plate assembly, as shown in fig. 1 to 4, a right rectangular area in fig. 1 is a rigid part of the brush plate assembly, and the brush wires are welded in two longitudinal rows of welding pads; the left bending area is a flexible part, and signals and current are input/output to the outside of the conductive slip ring through a gold finger. The conductive slip ring comprises two brush plate assemblies which are in mirror symmetry. Wherein: the device comprises a PCB flexible part 1, a conductive slip ring pressing sheet 2, a slip ring rotor 3, a slip ring external connector 4, a bearing 5, a slip ring gasket 6, a PCB rigid part 7, brush wires 8, a cover plate 9, a wave spring 10, a conductive slip ring 11 and a base 12.

The slip ring rotor 3 is of a main supporting structure, the slip ring rotor 3 is arranged in the middle of the base 12, and the bearing 5 is sleeved on the slip ring rotor 3 and fixed in the middle of the base 12. The slip ring gasket 6 is arranged on the upper part of the bearing 5 and sleeved with the slip ring rotor 3. The conductive slip ring 11 is arranged on the upper side of the slip ring gasket 6 and sleeved on the slip ring rotor 3. The wave spring 10 is sleeved on the slip ring rotor 3 and is not in contact with the slip ring rotor 3 to support a bearing at the upper part of the slip ring rotor 3, the conductive slip ring pressing sheet 2 is sleeved on the slip ring rotor 3, the cover plate 9 presses the slip ring rotor 3, the cover plate 9 is abutted against the wave spring 10, and the wave spring 10 is in a compressed state in a normal state.

The conductive slip ring pressing sheet 2, the bearing 5 and the cover plate 9; a group of PCB rigid parts 7, PCB flexible parts 1 and brush wires 8 are respectively arranged on two sides of the slip ring and are connected to a PCB on a base 12 through a slip ring external connector 4;

as shown in fig. 1 to 4, the design process of the functions performed by the brush plate is divided into 3 steps:

determining the external dimension of the brush plate, the position and the dimension of the mounting hole/positioning hole according to the structural requirements of the nacelle; the positions and the intervals of the brush wire mounting holes; flexible circuit shape, bending mode;

determining the current/voltage value passing through the brush plate according to the power transmission requirement of the nacelle, and designing the width/thickness of the rigid-flex circuit printed line according to the current/voltage value;

and determining the impedance parameters of the printed lines in the rigid-flex circuit according to the requirements of the signal transmission rate.

In the present invention, the brush plate structure/electrical parameters are as follows:

the length, width and thickness of the rigid part are respectively as follows: 16mm plus or minus 0.5 mm; 22mm plus or minus 0.5 mm; 1.8 mm-2 mm; the longitudinal direction and the transverse direction of the spacing between the brush wire holes are respectively as follows: 1.6mm plus or minus 0.05 mm; 11mm plus or minus 0.05 mm; the flexible part is bent at a 90-degree position;

the copper thickness of the PCB is 1oz, the line width of a power printed line is more than 60mil, and the PCB can bear current of more than 2.5A;

the differential impedance between the differential signal printed line pairs is 100 omega +/-10 omega, and the differential signal printed line pairs can transmit four-wire hundred-mega Ethernet signals.

According to the invention, through the design idea of mechanical and electrical integration, the requirements of structural support, power transmission and signal transmission are considered comprehensively, so that the size and weight of the brush plate are reduced; the number of parts of the slip ring is reduced; the assembly time of the slip ring is reduced. And because the PCB manufacturing process is applied to replace the traditional machining process, the cost is lower during the batch production of the brush plates.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A light and small integrated conductive slip ring brush plate is characterized by comprising: the device comprises a PCB flexible part, a conductive slip ring pressing sheet, a slip ring rotor, a slip ring external connector, a bearing, a slip ring gasket, a PCB rigid part, brush wires, a cover plate, a wave spring, a conductive slip ring and a base;

the slip ring rotor is of a main supporting structure, the slip ring rotor is arranged in the middle of the base, and the bearing is sleeved on the slip ring rotor and fixed in the middle of the base; the slip ring gasket is arranged at the upper part of the bearing and sleeved with the slip ring rotor; the conductive slip ring is arranged on the upper side of the slip ring gasket and sleeved on the slip ring rotor; the wave spring is sleeved on the slip ring rotor and is not in contact with the slip ring rotor, the wave spring is used for supporting a bearing at the upper part of the slip ring rotor, the conductive slip ring pressing sheet is sleeved on the slip ring rotor, the cover plate presses the slip ring rotor, the cover plate is abutted against the wave spring, and the wave spring is in a compressed state in a normal state; a group of PCB rigid parts, PCB flexible parts and brush wires are respectively arranged on two sides of the conductive slip ring and are connected to a PCB on the base through external connectors of the slip ring.

2. The lightweight compact integrated conducting slip ring brush plate according to claim 1, wherein the PCB plate has a copper thickness of 1oz and a power track width of >60 mil.

3. The light-weight and small-size integrated conductive slip ring brush plate according to claim 1, wherein the brush wires are welded in two rows of pads arranged longitudinally; the PCB flexible part inputs and outputs signals and current to the outside of the conductive slip ring through the gold fingers.