Large-diameter arc type angular displacement sensor

Abstract

The invention discloses a large-diameter arc-type angular displacement sensor, and belongs to the technical field of angular displacement sensor production, the large-diameter arc-type angular displacement sensor comprises a shell, a rotating shaft, an electric brush and a resistor body, the rotating shaft is connected with the hole wall of a rotating shaft through hole in the shell through a first bearing, and the resistor body is installed in the shell; the rotating shaft through hole and the working tape on the resistor body are arc-shaped, the circle center of the rotating shaft through hole and the circle center of the working tape on the resistor body are mutually overlapped, the two opposite sides of the first bearing are in contact with the hole walls of the two sides of the rotating shaft through hole respectively, and the rotating shaft and the first bearing can reciprocate in the rotating shaft through hole in the arc-shaped direction of the rotating shaft through hole; an electric brush bracket is connected to a position, positioned in the shell, of the rotating shaft; and the electric brush is mounted on the electric brush bracket and is in contact with a working tape on the resistor body. According to the invention, the application requirements of large-diameter arc type motion equipment are met, the occupied space of the sensor is reduced, the detection precision is improved, and the application cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of angular displacement sensor (potentiometer) manufacturing technology, specifically relating to a large-diameter circular arc angular displacement sensor. Background Technology

[0002] An angular displacement sensor (potentiometer) is an adjustable electronic component that changes the output potential by altering a certain electrical parameter (resistance, capacitance, inductance, mutual inductance, self-inductance, magnetic flux, etc.). It typically converts a mechanical input (rotation angle) into a corresponding electrical output (resistance value, capacitance, inductance, mutual inductance, self-inductance, magnetic reluctance, voltage value, output ratio, etc.); or converts an electrical input into a corresponding mechanical output. Angular displacement sensors are commonly used as rudder deflection angle feedback elements in systems and are one of the system's key components.

[0003] A typical angular displacement sensor mainly consists of a housing, a rotating shaft, a resistive element, a current collector ring, and brushes. The resistive element is installed inside the housing. The rotating shaft passes through a corresponding through-hole in the housing and the central through-hole of the resistive element. The current collector ring is mounted on the rotating shaft via an insulating sleeve. The brushes are mounted on the current collector ring and contact the working strip on the resistive element. In application, an external device drive unit is connected to the rotating shaft and drives it to rotate around its own centerline. The rotating shaft drives the current collector ring and brushes to rotate synchronously. The brushes slide and contact the working strip on the resistive element, collecting changing electrical signals and transmitting them to an external processor to realize the angular displacement detection function or convert the angular displacement into a corresponding electrical output.

[0004] Traditional angular displacement sensors can detect small-diameter angular displacements. However, in certain applications, it is necessary to detect or output corresponding electrical signals for large-diameter circular arc-shaped angular displacements. For example, in detecting the rotational angular displacement of an aircraft propeller, it is necessary to detect angular displacements of large-diameter circular arc motions. More specifically, there are two main applications requiring the detection of large-diameter circular arc-shaped angular displacements: one is where the component being detected itself needs to perform a large-diameter circular arc motion, and the other is where the component being detected still rotates around its own centerline, but due to installation space constraints, it needs to be connected to another location via a cantilever, thus creating a situation where large-diameter circular arc motion detection is required at the end of the cantilever.

[0005] In this case, the angular displacement sensor's shaft needs to follow the driving component in a large-diameter arc motion. However, the shaft of a traditional angular displacement sensor can only rotate around its own center line, which cannot meet the application requirements. In order to realize the angular displacement detection function of this large-diameter arc motion, a more complex transmission structure must be used to convert the large-diameter arc motion into a rotational motion around its own center line. This will not only increase the space occupied by the sensor, but also reduce the detection accuracy and increase the application cost. Summary of the Invention

[0006] The purpose of this invention is to provide a large-diameter circular arc angular displacement sensor to solve the above problems, wherein the rotating shaft can move in a large-diameter circular arc around the outer center line.

[0007] The present invention achieves the above objectives through the following technical solutions: A large-diameter arc-shaped angular displacement sensor includes a housing, a rotating shaft, a brush, and a resistor. The rotating shaft passes through a through-hole in the housing, with its inner end inside the housing and its outer end outside the housing. The rotating shaft is connected to the wall of the through-hole via a first bearing. The resistor is installed inside the housing. The brush is connected to the rotating shaft. Both the through-hole and the working band on the resistor are arc-shaped, with the center of the through-hole and the center of the working band overlapping each other. The opposite sides of the first bearing contact the two side walls of the through-hole, and the rotating shaft and the first bearing can reciprocate within the through-hole along its arc-shaped direction. A brush bracket is connected to the rotating shaft inside the housing, and the brush is mounted on the brush bracket and contacts the working band on the resistor.

[0008] Preferably, in order to facilitate reliable installation of the resistor, the housing is provided with an arc-shaped resistor mounting groove, and the arc-shaped resistor is installed in the resistor mounting groove. The center of the resistor mounting groove, the center of the resistor, the center of the rotating shaft through hole, and the center of the working strip on the resistor overlap with each other.

[0009] Preferably, to prevent external impurities from entering the resistor mounting groove and affecting the electrical signal acquisition function, the housing is provided with an arc-shaped groove with an opening on one side. The center of the arc-shaped groove overlaps with the center of the shaft through hole and the center of the working strip on the resistor. The shaft through hole is located at the bottom of the arc-shaped groove, and the bottom of the resistor mounting groove is part of the bottom of the arc-shaped groove. The two outer walls of the brush bracket are in contact with the two side walls of the arc-shaped groove.

[0010] Preferably, for ease of assembly, the open side of the arc-shaped groove of the outer casing is connected to the arc-shaped cover plate by screws.

[0011] Preferably, in order to achieve a more reliable limiting function for the brush holder and reduce friction, the inner side of the cover plate is provided with two inwardly protruding arc-shaped plates, and the outer wall of the side of the brush holder opposite to the brush contacts the arc-shaped end faces of the two arc-shaped plates.

[0012] Preferably, in order to improve the positioning reliability of the rotating shaft and achieve a stable and reliable transmission function with the brush holder, a second bearing is fitted on the inner end of the rotating shaft. The two opposite sides of the second bearing are in contact with one side of the arc-shaped groove and one side of the arc-shaped plate, respectively. The connection position between the brush holder and the rotating shaft is located between the first bearing and the second bearing.

[0013] Preferably, in order to facilitate a reliable anti-rotation connection between the brush holder and the shaft, one end of the brush holder is provided with a flat through hole, and a flat section is provided on the shaft at a position corresponding to the flat through hole. The flat section is located between the first bearing and the second bearing and is placed inside the flat through hole. A pin passes through the corresponding pin hole on the wall of the flat through hole and the corresponding pin hole on the flat section to achieve the connection between the shaft and the brush holder.

[0014] Preferably, in order to achieve a more stable and reliable support and positioning function for the brush bracket, the brush bracket is provided with a bracket boss at the position corresponding to the first bearing, which protrudes towards the first bearing. The first bearing is placed in the corresponding through hole of the bracket boss, and the two outer walls of the bracket boss are in contact with the two side holes of the rotating shaft through hole, respectively.

[0015] Preferably, in order to minimize the product size while meeting application requirements, the outer shell is arc-shaped, and the center of the outer shell, the center of the rotating shaft through hole, and the center of the working strip on the resistive element overlap with each other.

[0016] Preferably, in order to achieve the dual-redundancy signal acquisition function, the resistor has two working strips and two brushes, with the two brushes respectively contacting the two working strips.

[0017] The beneficial effects of this invention are as follows: This invention designs both the through-hole of the rotating shaft and the working strip on the resistive element as arc shapes with their centers overlapping. This enables the rotating shaft to drive the brush holder and brush to perform a large-diameter arc-shaped movement. Combined with the arc-shaped working strip on the resistive element, this allows the rotating shaft to follow the drive component in a large-diameter arc-shaped movement, directly achieving the function of detecting or outputting corresponding changing electrical signals for large-diameter arc-shaped angular displacement. This meets the application requirements of large-diameter arc-shaped motion devices, eliminating the need for a complex transmission structure to convert the large-diameter arc-shaped movement into rotational motion around the rotating shaft's centerline. This reduces the sensor's footprint, improves detection accuracy, and lowers application costs. Furthermore, by employing various specific and reliable positioning structures for the rotating shaft, brush holder, and resistive element, a more stable and reliable sensor function is achieved. Attached Figure Description

[0018] Figure 1This is a three-dimensional view of the large-diameter circular arc angular displacement sensor described in this invention before assembly; Figure 2 This is a perspective view of the housing of the large-diameter arc-shaped angular displacement sensor described in this invention; Figure 3 This is a perspective view of the rotating shaft of the large-diameter arc-shaped angular displacement sensor described in this invention; Figure 4 This is a perspective view of the brush bracket of the large-diameter arc-shaped angular displacement sensor described in this invention; Figure 5 This is a perspective view of the rotating shaft and brush bracket of the large-diameter arc-shaped angular displacement sensor described in this invention before assembly; Figure 6 This is a perspective view of the assembled shaft and brush bracket of the large-diameter arc-shaped angular displacement sensor described in this invention. Figure 7 This is a front view of the large-diameter circular arc angular displacement sensor after assembly according to the present invention; Figure 8 yes Figure 7 Enlarged AA section view in the image; Figure 9 This is a partial three-dimensional cross-section of the large-diameter arc-shaped angular displacement sensor described in this invention after removing the cover plate and assembling it. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-9 As shown, the large-diameter arc-shaped angular displacement sensor of the present invention includes a housing 5, a rotating shaft 13, a brush 11, and a resistor 3. The rotating shaft 13 passes through a rotating shaft through hole 7 on the housing 5, with its inner end located inside the housing 5 and its outer end located outside the housing 5. The rotating shaft 13 is connected to the hole wall of the rotating shaft through hole 7 by a first bearing 14. The resistor 3 is installed inside the housing 5. The brush 11 is connected to the rotating shaft 13. The working strip 23 on the rotating shaft through hole 7 and the resistor 3 are both arc-shaped, and the center of the rotating shaft through hole 7 and the center of the working strip 23 on the resistor 3 overlap each other. The opposite sides of the first bearing 14 are in contact with the two side holes of the rotating shaft through hole 7, and the rotating shaft 13 and the first bearing 14 can reciprocate along their arc-shaped direction inside the rotating shaft through hole 7. A brush bracket 12 is connected to the rotating shaft 13 at a position inside the housing 5. The brush 11 is installed on the brush bracket 12 through a brush seat 10 and is in contact with the working strip 23 on the resistor 3.

[0020] like Figures 1-9 As shown, the present invention also discloses the following more optimized specific structures: To facilitate reliable installation of the resistor 3, the housing 5 is provided with an arc-shaped resistor mounting groove 16. The arc-shaped resistor 3 is installed in the resistor mounting groove 16. The center of the resistor mounting groove 16, the center of the resistor 3, the center of the rotating shaft through hole 7, and the center of the working strip 23 on the resistor 3 overlap with each other.

[0021] To prevent external impurities from entering the resistor mounting groove 16 and affecting the electrical signal acquisition function, the housing 5 is provided with an arc-shaped groove 15 with an opening on one side. The center of the arc-shaped groove 15 overlaps with the center of the shaft through hole 7 and the center of the working strip 23 on the resistor 3. The shaft through hole 7 is located at the bottom of the arc-shaped groove 15. The bottom of the resistor mounting groove 16 is part of the bottom of the arc-shaped groove 15. The outer walls on both sides of the brush bracket 12 are in contact with the two side walls of the arc-shaped groove 15.

[0022] For ease of assembly, the open side of the arc-shaped groove 15 of the outer casing 3 is connected to the arc-shaped cover plate 1 by screws.

[0023] In order to achieve a more reliable limiting function for the brush holder 12 and reduce friction, the inner side of the cover plate 1 is provided with two inwardly protruding arc-shaped plates 2, and the outer wall of the side of the brush holder 12 opposite to the brush 11 contacts the arc-shaped end faces of the two arc-shaped plates 2.

[0024] In order to improve the positioning reliability of the rotating shaft 13 and realize the stable and reliable transmission function between it and the brush bracket 12, a second bearing 9 is fitted on the inner end of the rotating shaft 13. The opposite sides of the second bearing 9 are in contact with one side of the groove wall of the arc-shaped slide 15 and one side of the surface of the arc-shaped plate 2, respectively. The connection position between the brush bracket 12 and the rotating shaft 13 is located between the first bearing 14 and the second bearing 9.

[0025] To facilitate a reliable anti-rotation connection between the brush holder 12 and the rotating shaft 13, a flat through hole 20 is provided at one end of the brush holder 12. A flat section 17 is provided on the rotating shaft 13 at a position corresponding to the flat through hole 20. The flat section 17 is located between the first bearing 14 and the second bearing 9 and is placed inside the flat through hole 20. The pin 22 passes through the corresponding pin hole 19 on the hole wall of the flat through hole 20 and the corresponding pin hole 18 on the flat section 17 to achieve the connection between the rotating shaft 13 and the brush holder 12.

[0026] In order to achieve a more stable and reliable support and positioning function for the brush bracket 12, a bracket boss 21 is provided on the brush bracket 12 at the position corresponding to the first bearing 14, protruding towards the first bearing 14. The first bearing 14 is placed in the corresponding through hole of the bracket boss 21, and the two outer walls of the bracket boss 21 are in contact with the two side walls of the rotating shaft through hole 7 respectively.

[0027] In order to minimize the product size while meeting application requirements, the outer casing 5 is arc-shaped, and the center of the outer casing 5, the center of the rotating shaft through hole 7, and the center of the working strip 23 on the resistor 3 overlap with each other.

[0028] To achieve the dual-redundancy signal acquisition function, there are two working strips 23 on the resistor 3 and two brushes 11, with the two brushes 11 respectively contacting the two working strips 23.

[0029] Figure 1 It also shows multiple connecting screw holes 4 on the resistor 3, multiple connecting through holes 6 on the housing 5, and mounting lugs 8 at both ends of the housing 3. These structures are all conventional adaptive structures.

[0030] like Figures 1-9 As shown, in application, the outer casing 5 is mounted on other components (not shown in the figure) via mounting lugs 8. The outer end of the rotating shaft 13 is connected to the driving component (not shown in the figure). To avoid damage to related components due to assembly errors between the driving component and the rotating shaft or coordination errors between the arc-shaped movement trajectory of the driving component and the arc-shaped channel of the rotating shaft through hole 7, a floating connection structure is preferably adopted between the outer end of the rotating shaft 13 and the driving component. The floating connection structure can be easily achieved using components such as springs in the prior art, and will not be described in detail here. The resistor 3 is connected to the external power supply and the processor. After the connection is completed, the driving component drives the rotating shaft 13 to move in the arc-shaped channel of the rotating shaft through hole 7. The rotating shaft 13 drives the brush bracket 12, the brush holder 10 and the two brushes 11 to slide in contact on the two working strips 23 of the resistor 3, transmitting the changing electrical signal to the processor to realize the function of large-diameter arc-shaped angular displacement detection. During this process, the first bearing 14 and the second bearing 9 move in their respective arc-shaped channels. If the frictional forces on both sides are equal, they are in a sliding state; if the frictional forces on both sides differ significantly, they are in a state of parallel rolling and sliding, which can, to some extent, avoid operational obstacles caused by sliding under high friction. Therefore, compared with non-rolling direct hard contact structures, the first bearing 14 and the second bearing 9 have the advantage of being better able to adapt to actual working conditions.

[0031] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A large-diameter circular arc angular displacement sensor, comprising a housing, a rotating shaft, a brush and a resistance body, the rotating shaft passes through a rotating shaft through hole on the housing and its inner end is located in the housing and its outer end is located outside the housing, the rotating shaft is connected with the hole wall of the rotating shaft through hole through a first bearing, the resistance body is installed in the housing, and the brush is connected with the rotating shaft, characterized in that: The working band on the resistance body and the through hole of the rotating shaft are both circular arcs, and the centers of the working band on the resistance body and the through hole of the rotating shaft overlap with each other, the opposite sides of the first bearing are in contact with the two side hole walls of the through hole of the rotating shaft respectively, and the rotating shaft and the first bearing can reciprocate along the direction of the circular arc of the through hole of the rotating shaft. ​ 2. The large diameter arc of circle angular displacement transducer of claim 1 wherein: The shell is provided with a circular arc-shaped resistance body mounting groove, and the circular arc-shaped resistance body is mounted in the resistance body mounting groove.

3. The large diameter arc of circle angular displacement sensor of claim 2, wherein: The shell is provided with a circular arc-shaped sliding groove with one open side, the center of the circular arc-shaped sliding groove overlaps with the center of the through hole of the rotating shaft and the center of the working band on the resistance body, the through hole of the rotating shaft is located at the groove bottom of the circular arc-shaped sliding groove, the groove bottom of the resistance body mounting groove is part of the groove bottom of the circular arc-shaped sliding groove, and the two side outer walls of the brush holder are in contact with the two side groove walls of the circular arc-shaped sliding groove respectively.

4. The large diameter arc of circle angular displacement transducer of claim 3 wherein: The open side of the circular arc-shaped sliding groove of the shell is connected with a circular arc-shaped cover plate through screws.

5. The large diameter arc of circle angular displacement transducer of claim 4 wherein: The inner side of the cover plate is provided with two inwardly protruding circular arc-shaped plates, and the side outer wall of the brush holder opposite to the brush is in contact with the circular arc-shaped end face of the two circular arc-shaped plates.

6. The large diameter arc of circle angular displacement transducer of claim 5 wherein: The inner end of the rotating shaft is provided with a second bearing, the opposite sides of the second bearing are in contact with one side groove wall of the circular arc-shaped sliding groove and one side surface of the circular arc-shaped plate respectively, and the connection position of the brush holder and the rotating shaft is located between the first bearing and the second bearing.

7. Large-diameter circular arc angle displacement sensor according to any one of claims 1 to 6, characterized in that One end of the brush holder is provided with a flat-shaped through hole, the corresponding position of the rotating shaft is provided with a flat-shaped section, the flat-shaped section is located between the first bearing and the second bearing and is placed in the flat-shaped through hole, and the connection between the rotating shaft and the brush holder is realized through the corresponding pin holes in the hole walls of the flat-shaped through hole and the corresponding pin holes in the flat-shaped section by a pin.

8. The large diameter arc of circle angular displacement transducer of claim 7 wherein: The corresponding position of the brush holder and the first bearing is provided with a holder boss protruding towards the first bearing, the first bearing is placed in the corresponding through hole of the holder boss, and the two side outer walls of the holder boss are in contact with the two side hole walls of the rotating shaft through hole respectively.

9. The large diameter arc of circle angular displacement transducer according to any one of claims 1-6, characterized in that: The shell is circular arc-shaped, and the center of the shell, the center of the through hole of the rotating shaft and the center of the working band on the resistance body overlap with each other.

10. The large diameter arc of circle angular displacement sensor according to any one of claims 1-6, wherein: The working band on the resistance body is two, and the brush is two, and the two brushes are in contact with the two working bands respectively. The working band on the resistance body is two, and the brush is two, and the two brushes are in contact with the two working bands respectively.

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