Round plastic-encapsulated large-angle rotary variable potentiometer
By employing a brush-shaft riveting structure and a metal stop plate design in the rotary variable potentiometer, the problems of unstable contact and insufficient rotation angle are solved, thereby improving contact reliability and stopping strength.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DIFENG HONGYANG ELECTRONICS (SHENZHEN) CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-05-26
AI Technical Summary
Existing rotary variable potentiometers suffer from problems such as unstable contact between the positioning spring and the brush, insufficient mechanical rotation angle, and poor stopping strength.
The brush and the rotating shaft are fixed by a riveting structure, the terminal is moved outside the mechanical rotation stroke, the stop plate and the rotating shaft are integrally molded with plastic, and the bracket is a hardware part, which enhances the contact reliability and stopping strength.
This achieves reliable contact between the brush and the carbon sheet, increases the mechanical rotation angle and stopping strength, and improves the problems of poor contact and insufficient stopping strength.
Smart Images
Figure CN224287895U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of electrical engineering, and in particular to a circular plastic-encapsulated large-angle rotating variable potentiometer. Background Technology
[0002] like Figure 1 , Figure 2 As shown, the existing rotary variable potentiometer (mainly with an outer diameter of 8.8mm) has its positioning spring and brush integrally molded and encased in plastic on the rotating shaft, and the central hole of the rotating shaft is threaded. The defects are as follows:
[0003] (1) The positioning spring and the brush are integrally formed and encapsulated in plastic on the rotating shaft. The force direction of the positioning spring in this way is opposite to that of the brush, which makes the contact between the brush and the carbon sheet unstable, resulting in poor contact between the two and affecting the function of the device.
[0004] (2) The terminals are located within the mechanical rotation stroke of the rotary potentiometer cavity. The maximum mechanical rotation angle is 240 degrees, and it is impossible to achieve a larger mechanical rotation angle.
[0005] (3) The stop of the variable potentiometer relies on the plastic stop formed by the spring and brush being molded together and the plastic stop of the outer shell, resulting in poor stopping strength and affecting the function of the device. Summary of the Invention
[0006] To overcome the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a circular plastic-encapsulated large-angle rotating variable potentiometer, which can ensure the reliability of the contact between the brush and the shell and carbon sheet, enable the brush and the rotating shaft to have a larger mechanical rotation range, enhance the stopping strength, and solve the problem of insufficient stopping strength of the original structure.
[0007] The technical solution of this utility model is: This circular plastic-encapsulated large-angle rotating variable potentiometer includes: a shell (1), a bracket (2), a rotating shaft (3), a stop plate (4), a brush (5), a carbon sheet (6), a terminal (7), and a spring (8);
[0008] The housing includes a circular inner cavity and a rectangular cover. A carbon sheet with a circular and rectangular portion is placed inside the housing. Three terminals connected to the rectangular portion of the carbon sheet protrude from the housing. The stop plate and the bracket are both metal parts. The stop plate and the rotating shaft are integrally molded with plastic. The stop plate contacts the stop of the bracket. The brush and the rotating shaft are fixed together by a riveting structure and then placed inside the housing. Then, a spring is placed, and finally, the bracket is installed. The brush contacts the carbon sheet. The resistance of the variable potentiometer is adjusted by rotating the rotating shaft to drive the brush to rotate.
[0009] The brush and the rotating shaft of this invention are fixed by a riveting structure, which ensures the reliability of the contact between the brush and the outer shell and carbon sheet; the terminal is moved from inside the mechanical rotation stroke of the potentiometer to outside the mechanical rotation stroke to ensure that there is enough mechanical rotation angle to increase; the stop plate and the bracket are both hardware parts, the stop plate and the rotating shaft are integrally molded with plastic, and the stop plate and the bracket make contact with the stop, thereby enhancing the stopping strength and solving the problem of insufficient stopping strength of the original structure. Attached Figure Description
[0010] Figure 1 An enlarged schematic diagram of a prior art circular plastic-encapsulated large-angle rotating variable potentiometer is shown.
[0011] Figure 2 An enlarged structural schematic diagram of a circular plastic-encapsulated large-angle rotating variable potentiometer according to the present invention is shown.
[0012] Figure 3 A cross-sectional structural schematic diagram of the terminals of a circular plastic-encapsulated large-angle rotating variable potentiometer according to the present invention is shown.
[0013] Figure 4 This diagram shows the assembly of the carbon sheet, terminals, and housing of a circular plastic-encapsulated large-angle rotary variable potentiometer according to the present invention. Figure 4 A is a terminal. Figure 4 B is a carbon sheet. Figure 4 C is an assembly diagram of the carbon sheet and terminals. Figure 4 D is an assembly diagram of the carbon sheet, terminals, and housing.
[0014] Figure 5 The diagram shows the stop plate, rotating shaft, and stop structure of the circular plastic-encapsulated large-angle rotating variable potentiometer according to the present invention, as well as assembly details and a schematic diagram. Figure 5 A is a stop-loss film. Figure 5 B is the pivot. Figure 5 C is an assembly diagram of the stop plate, rotating shaft, and bracket. Figure 5 D stands for bracket. Figure 5 E is Figure 5 Sectional view of C (AA).
[0015] Figure 6 This diagram shows the assembly of the brush and shaft of a circular plastic-encapsulated large-angle rotating variable potentiometer according to the present invention. Figure 6 A is the pivot. Figure 6 B stands for brush.
[0016] Figure 7 This diagram shows the assembly of the housing and shaft of a circular plastic-encapsulated large-angle rotating variable potentiometer according to the present invention. Figure 7 A is the outer shell. Figure 7 B is the pivot. Figure 7 C is an assembly diagram of the outer casing and the rotating shaft.
[0017] Figure 8 This diagram shows the assembly of the spring and housing of a circular plastic-encapsulated large-angle rotary variable potentiometer according to the present invention. Figure 8 A is a shrapnel. Figure 8 B stands for outer shell. Figure 8 C is an assembly diagram of the spring and the outer shell.
[0018] Figure 9 The diagram shows the assembly of the bracket and other parts of the circular plastic-encapsulated large-angle rotating variable potentiometer according to the present invention. Figure 9 A is a support. Figure 9 B refers to any other component besides the bracket of the variable potentiometer. Figure 9 C is a schematic diagram of the assembly of the bracket with other parts. Detailed Implementation
[0019] like Figures 2-9 As shown, this circular plastic-encapsulated large-angle rotary variable potentiometer includes: a housing 1, a bracket 2, a rotating shaft 3, a stop plate 4, a brush 5, a carbon plate 6, a terminal 7, and a spring 8.
[0020] The housing includes a circular inner cavity and a rectangular cover. A carbon sheet with a circular and rectangular portion is placed inside the housing. Three terminals connected to the rectangular portion of the carbon sheet protrude from the housing. The stop plate and bracket are all metal parts. The stop plate and the rotating shaft are integrally molded with plastic. The brush and the rotating shaft are fixed together by a riveting structure and then placed inside the housing. Then, a spring is placed, and finally, the bracket is installed. The brush contacts the carbon sheet, and the resistance of the variable potentiometer is adjusted by rotating the rotating shaft to drive the brush to rotate.
[0021] The brush and the rotating shaft of this invention are fixed by a riveting structure, which ensures the reliability of the contact between the brush and the outer shell and carbon sheet. The terminal is moved from inside the mechanical rotation stroke of the potentiometer to outside the mechanical rotation stroke to ensure that there is enough mechanical rotation angle to increase. The stop plate and the bracket are both hardware parts. The stop plate and the rotating shaft are integrally molded with plastic. The stop plate and the bracket stop each other to enhance the stopping strength and solve the problem of insufficient product stopping strength caused by the original plastic stop structure and the smaller stop part after the mechanical rotation range is increased.
[0022] Preferably, such as Figure 4 As shown, the terminal and carbon sheet adopt a pull-tube riveting structure and are encapsulated in a plastic-molded shell. This makes the contact performance between the two more stable, thereby improving poor contact.
[0023] Preferably, such as Figure 8As shown, the spring and the outer shell adopt a four-positioning-post structure, and the force direction is consistent with the force direction of the brush. This improves the spindle wobble phenomenon and makes the feel smoother.
[0024] Preferably, such as Figure 2 As shown, the center of the rotating shaft is a circular hole, using a self-tapping thread method. This greatly reduces the need for mold precision, improves production efficiency, and lowers costs.
[0025] The rotating shaft is formed by coating a metal stop plate with rubber. Its stopping part uses a metal plate built into the bracket and a metal stop as the stopping structure.
[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.
Claims
1. A circular, plastic-encapsulated, large-angle rotary variable potentiometer, characterized in that: It includes: housing (1), bracket (2), rotating shaft (3), stop plate (4), brush (5), carbon sheet (6), terminal (7), and spring (8); The housing includes a circular inner cavity and a rectangular cover. A carbon sheet with a circular and rectangular portion is placed inside the housing. Three terminals connected to the rectangular portion of the carbon sheet protrude from the housing. The stop plate and the bracket are all metal parts. The stop plate and the rotating shaft are integrally molded with plastic. The stop plate makes contact with the stop of the bracket. The brush is fixed to the rotating shaft by a riveting structure and then placed inside the housing. Then, a spring is placed, and finally, the bracket is installed. The brush contacts the carbon sheet. The resistance value of the variable potentiometer is adjusted by rotating the rotating shaft to drive the brush to rotate.
2. The round plastic encapsulated large angle rotary variable resistor according to claim 1, wherein: The terminals and carbon sheets are joined by a tube-drawing and riveting structure and encapsulated in a plastic-molded shell.
3. The round plastic encapsulated large angle rotary variable resistor according to claim 2, wherein: The spring and the outer shell adopt a four-positioning post structure, and the force direction is consistent with the force direction of the brush.
4. The round plastic encapsulated large angle rotary variable resistor according to claim 3, wherein: The center of the rotating shaft is a circular hole, which uses a self-tapping thread method.
5. The circular plastic-encapsulated large-angle rotary variable potentiometer according to claim 4, characterized in that: The rotating shaft is formed by coating a metal stop plate with rubber. Its stopping part uses a metal plate built into the bracket and a metal stop as the stopping structure.