High-reliability small angular displacement potentiometer with voltage conversion function

Abstract

The utility model discloses a high-reliability small angular displacement potentiometer with a voltage conversion function, which comprises a shell, a cover plate, a voltage conversion circuit board, a rotating shaft, an external end bearing, a resistor body, an insulating sleeve, a collector ring, an electric brush, a resistor body lead and an output lead, a rotating shaft protruding ring is formed on the edge of the outer end of the large-diameter connecting part, a split washer is arranged at the position, close to the large-diameter connecting part, of the rotating shaft, the large-diameter connecting part is sleeved with the external end bearing, the inner ring of the external end bearing is located between the split washer and the rotating shaft protruding ring, and a bearing flange plate is arranged on the outer ring of the external end bearing. The bearing flange plate is located in a limiting groove formed between the shell and the cover plate. According to the utility model, the structure for limiting the external end bearing and the rotating shaft is improved, so that the function of effectively preventing the rotating shaft from axially moving can be realized only by adopting one external end bearing, the axial size and volume of the potentiometer are reduced, and the potentiometer is convenient to apply.

Description

Technical Field

[0001] The utility model relates to an angular displacement potentiometer, in particular to a high-reliability small-sized angular displacement potentiometer with a voltage conversion function. Background Art

[0002] The function of the angular displacement potentiometer (also called angular displacement sensor) is to convert the angular displacement of mechanical rotation into a corresponding electrical signal and detect it in real time. With the development of science and technology, angular displacement potentiometers are widely used in the fields of industry, shipbuilding, aviation, aerospace and other complete machines and precision instruments that have high technical indicators for high precision and long life and are required to meet various harsh test requirements.

[0003] The angular displacement potentiometer based on conductive plastic resistor is a mainstream angular displacement potentiometer. Its basic principle is to use the rotating shaft to drive the brush to contact and slide on the working band of the resistor, output the changing electrical signal and realize the angular displacement detection function.

[0004] Traditional angular displacement potentiometers generally do not have voltage conversion functions, but in recent years, angular displacement potentiometers used in aviation, aerospace and other fields require stable and reliable output signals, and the demand for potentiometers that convert large voltages into small voltage signals is becoming more and more widespread. If the voltage conversion function is not integrated into the potentiometer, it is necessary to add an additional voltage conversion circuit when using it to keep its application unchanged. In order to solve this problem, integrating the voltage conversion function into the potentiometer is an optimization measure, that is, installing the voltage conversion circuit board in the potentiometer and connecting it to the resistor body to output the converted voltage signal for easy application. Since it is necessary to add a voltage conversion circuit board in the potentiometer, the volume of the potentiometer will inevitably increase. Therefore, how to reasonably design the internal structure of the potentiometer to reduce the volume becomes an important issue.

[0005] like Figure 1 As shown, the conventional angular displacement potentiometer with voltage conversion function comprises a conventional housing 3, a conventional cover plate 2, a conventional voltage conversion circuit board 4, a conventional rotating shaft 8, a conventional external end bearing 9, a conventional resistor 5, a conventional insulating sleeve 7, a conventional collector ring 6, a conventional brush 10, a conventional resistor lead 11 and a conventional output lead 1. The conventional resistor 5 and the conventional voltage conversion circuit board 4 are respectively mounted on the inner wall of the conventional housing 3, the conventional rotating shaft 8 passes through the corresponding through holes on the conventional housing 3 and is connected through two conventional external end bearings 9, the conventional insulating sleeve 7 is sleeved on the conventional rotating shaft 8, the conventional collector ring 6 is sleeved on the conventional insulating sleeve 7, and the conventional brush 10 is mounted on the conventional collector ring 6 and contacts the working band of the conventional resistor 5.

[0006] The defects of the above-mentioned traditional angular displacement potentiometer with voltage conversion function are: first, in order to prevent the axial movement of the traditional rotating shaft 8, a structure of two traditional external end bearings 9 connected in series is adopted, and the outer rings of the two traditional external end bearings 9 are respectively provided with outwardly convex bearing flanges, and the traditional housing 3 is provided with a corresponding convex ring and the convex ring is located between the two bearing flanges to achieve the purpose of preventing the axial movement of the traditional rotating shaft 8. Because this structure requires the cooperation of two traditional external end bearings 9, the axial size and volume of the potentiometer will be increased; second, the relative positions of the components will reduce the reliability of the operation of the potentiometer, as follows: The traditional resistor 5 is close to the traditional external end bearing 9, and the traditional collector ring 6 is located between the traditional resistor 5 and the traditional voltage conversion circuit board 4. The traditional resistor lead 11 needs to start from the position close to the traditional external end bearing 9 and pass through the outer side of the edge of the traditional resistor 5 and the traditional collector ring 6 until it is connected to the traditional voltage conversion circuit board 4. Since the spacing between the traditional resistor lead 11 and the traditional external end bearing 9 is very small, the traditional resistor lead 11 may contact with the traditional external end bearing 9 and pose a safety hazard. The traditional collector ring 6 may also contact with the traditional resistor lead 11 during rotation and cause product failure. Utility Model Content

[0007] The purpose of the utility model is to provide a small angular displacement potentiometer with a smaller volume and a high reliability and a voltage conversion function in order to solve the above problems.

[0008] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0009] A highly reliable small angular displacement potentiometer with a voltage conversion function, comprising a housing, a cover plate, a voltage conversion circuit board, a rotating shaft, an external terminal bearing, a resistor, an insulating sleeve, a collector ring, a brush, a resistor lead and an output lead, wherein the rotating shaft passes through a corresponding through hole on the housing and is connected through the external terminal bearing, the voltage conversion circuit board and the resistor are respectively mounted on the inner wall of the housing, the insulating sleeve is sleeved on the rotating shaft, the collector ring is sleeved on the insulating sleeve, the brush is mounted on the collector ring and contacts the working belt on the resistor, the resistor lead and the output lead on the resistor are respectively connected to the voltage conversion circuit board and the output lead. The pressure conversion circuit board is connected, the outer diameter of the position on the rotating shaft that passes through the external end bearing is enlarged to form a large diameter connecting part, and the large diameter connecting part is provided with a connecting blind hole, the outer end edge of the large diameter connecting part is bent toward the outer circumference to form a rotating shaft convex ring, a concave ring is provided at a position close to the large diameter connecting part on the rotating shaft, and an open retaining ring is sleeved in the concave ring, the external end bearing is one and is sleeved outside the large diameter connecting part, the inner ring of the external end bearing is located between the open retaining ring and the rotating shaft convex ring, the outer ring of the external end bearing is provided with a bearing flange protruding toward the outer circumference, and the bearing flange is located in a limiting groove formed between the outer shell and the cover plate.

[0010] Preferably, in order to avoid safety hazards and malfunctions caused by mutual influence between components, the voltage conversion circuit board is located close to the open retaining ring, the resistor is located between the voltage conversion circuit board and the collector ring, and the resistor lead is located in the space between the resistor and the voltage conversion circuit board.

[0011] Preferably, to facilitate processing and assembly, the housing comprises a first housing and a second housing, the cover plate comprises a first cover plate and a second cover plate, one end of the first housing is connected to the first cover plate and forms the limiting groove, the large diameter connecting portion and the external end bearing are located in the first housing, the voltage conversion circuit board is mounted on the first housing, the other end of the first housing is connected to one end of the second housing, the resistor is mounted on the second housing, and the other end of the second housing is connected to the second cover plate.

[0012] Preferably, in order to facilitate the anti-rotation connection between the rotating shaft and other components, the connecting blind hole of the large-diameter connecting part is a hexagonal hole.

[0013] The beneficial effects of the utility model are:

[0014] The utility model improves the structure for limiting the external end bearing and the rotating shaft, and only needs one external end bearing to achieve the function of effectively preventing the axial movement of the rotating shaft. Compared with the traditional two bearings, the axial size and volume of the potentiometer are reduced, which is convenient for application. By changing the relative position relationship between the resistor, the voltage conversion circuit board and the collector ring, the safety hazards and malfunctions caused by the mutual influence between the components are solved without affecting the functions of the components and increasing the volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main cross-sectional structure of a conventional angular displacement potentiometer with voltage conversion function;

[0016] Figure 2 It is a schematic diagram of the main cross-sectional structure of the high-reliability small angular displacement potentiometer with voltage conversion function described in the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] like Figure 2As shown, the high-reliability small angular displacement potentiometer with voltage conversion function of the utility model includes a shell (refer to the first shell 15 and the second shell 14 in the following content), a cover plate (refer to the first cover plate 28 and the second cover plate 13 in the following content), a voltage conversion circuit board 20, a rotating shaft 22, an external end bearing 25, a resistor 18, an insulating sleeve 21, a collector ring 17, a brush 16, a resistor lead 19 and an output lead 12, the rotating shaft 22 passes through the corresponding through hole on the shell and is connected through the external end bearing 25, the voltage conversion circuit board 20 and the resistor 18 are respectively mounted on the inner wall of the shell, the insulating sleeve 21 is sleeved on the rotating shaft 22, the collector ring 17 is sleeved on the insulating sleeve 21, the brush 16 is mounted on the collector ring 17 and contacts the working belt on the resistor 18, and the resistor The resistor lead 19 and the output lead 12 on the body 18 are respectively connected to the voltage conversion circuit board 20. The outer diameter of the position where the external end bearing 25 is passed through the rotating shaft 22 is enlarged to form a large diameter connecting part 24, and the large diameter connecting part 24 is provided with a connecting blind hole (not marked in the figure). The outer end edge of the large diameter connecting part 24 is bent toward the peripheral direction to form a rotating shaft convex ring 26. A concave ring is provided at a position close to the large diameter connecting part 24 on the rotating shaft 22, and an open retaining ring 23 is sleeved in the concave ring. There is one external end bearing 25 and it is sleeved outside the large diameter connecting part 24. The inner ring of the external end bearing 25 is located between the open retaining ring 23 and the rotating shaft convex ring 26. The outer ring of the external end bearing 25 is provided with a bearing flange 27 protruding toward the peripheral direction. The bearing flange 27 is located in a limiting groove (not marked in the figure) formed between the outer shell and the cover plate.

[0019] like Figure 2 As shown, the utility model also discloses the following more optimized specific structures:

[0020] In order to avoid safety hazards and failures caused by mutual influence between components, the voltage conversion circuit board 20 is located near the open retaining ring 23, the resistor 18 is located between the voltage conversion circuit board 20 and the collector ring 17, and the resistor lead 19 is located in the space between the resistor 18 and the voltage conversion circuit board 20.

[0021] To facilitate processing and assembly, the shell includes a first shell 15 and a second shell 14, the cover plate includes a first cover plate 28 and a second cover plate 13, one end of the first shell 15 is connected to the first cover plate 28 and forms the limit groove, the large diameter connecting portion 24 and the external end bearing 25 are located in the first shell 15, the voltage conversion circuit board 20 is installed on the first shell 15, the other end of the first shell 15 is connected to one end of the second shell 14, the resistor 18 is installed on the second shell 14, and the other end of the second shell 14 is connected to the second cover plate 13.

[0022] In order to facilitate the anti-rotation connection between the rotating shaft and other components, the connecting blind hole of the large-diameter connecting part 24 is a hexagonal hole.

[0023] like Figure 2 As shown, when working, the rotating shaft 22 is connected to the driving member of the device to be detected through the connecting blind hole of the large diameter connecting part 24, and the driving member drives the rotating shaft 22 to rotate synchronously. The rotating shaft 22 drives the insulating sleeve 21, the collector ring 17, and the brush 16 to rotate synchronously. The brush 16 contacts and slides on the working belt of the resistor 18 to generate a changing voltage signal. The voltage signal is transmitted to the voltage conversion circuit board 20 for voltage conversion (generally to reduce the voltage), and then transmitted to the external processor through the output lead 12 to realize the angular displacement detection function.

[0024] Note: The voltage conversion circuit board 20, rotating shaft 22, external end bearing 25, resistor 18, insulating sleeve 21, collector ring 17, brush 16, resistor lead 19, and output lead 12 in the above specific implementation content respectively correspond to the traditional voltage conversion circuit board 4, traditional rotating shaft 8, traditional external end bearing 9, traditional resistor 5, traditional insulating sleeve 7, traditional collector ring 6, traditional brush 10, traditional resistor lead 11, and traditional output lead 1 in the background technology content. However, because the structure of some components has changed, other components have followed the adaptive changes, so different component names and marking numbers are used to distinguish them.

[0025] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A highly reliable small angular displacement potentiometer with a voltage conversion function, comprising a housing, a cover plate, a voltage conversion circuit board, a rotating shaft, an external terminal bearing, a resistor, an insulating sleeve, a collector ring, a brush, a resistor lead and an output lead, wherein the rotating shaft passes through a corresponding through hole on the housing and is connected through the external terminal bearing, the voltage conversion circuit board and the resistor are respectively mounted on the inner wall of the housing, the insulating sleeve is sleeved on the rotating shaft, the collector ring is sleeved on the insulating sleeve, the brush is mounted on the collector ring and contacts the working belt on the resistor, the resistor lead and the output lead on the resistor are respectively connected to the voltage conversion circuit board, and is characterized in that: The outer diameter of the position on the rotating shaft that passes through the external end bearing is enlarged to form a large diameter connecting part, and the large diameter connecting part is provided with a connecting blind hole, the outer end edge of the large diameter connecting part is bent toward the outer circumference to form a rotating shaft convex ring, a concave ring is provided at a position on the rotating shaft close to the large diameter connecting part, and an open retaining ring is sleeved inside the concave ring, there is one external end bearing and it is sleeved outside the large diameter connecting part, the inner ring of the external end bearing is located between the open retaining ring and the rotating shaft convex ring, the outer ring of the external end bearing is provided with a bearing flange protruding toward the outer circumference, and the bearing flange is located in a limiting groove formed between the outer shell and the cover plate.

2. The high-reliability small-sized angular displacement potentiometer with voltage conversion function according to claim 1, characterized in that: The voltage conversion circuit board is located near the open retaining ring, the resistor is located between the voltage conversion circuit board and the collector ring, and the resistor lead is located in the space between the resistor and the voltage conversion circuit board.

3. The high-reliability small-sized angular displacement potentiometer with voltage conversion function according to claim 2, characterized in that: The housing comprises a first housing and a second housing, the cover comprises a first cover and a second cover, one end of the first housing is connected to the first cover and forms the limiting groove, the large diameter connecting portion and the external end bearing are located in the first housing, the voltage conversion circuit board is mounted on the first housing, the other end of the first housing is connected to one end of the second housing, the resistor is mounted on the second housing, and the other end of the second housing is connected to the second cover.

4. The high-reliability small-sized angular displacement potentiometer with voltage conversion function according to claim 1, 2 or 3, characterized in that: The connecting blind hole of the large-diameter connecting part is a hexagonal hole.

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