Mechanical zeroing structure for potentiometer

Abstract

The utility model discloses a kind of mechanical zeroing structures of potentiometer, including the connecting cover of the rotating shaft attached to the potentiometer, adjusting shaft is engaged in connecting cover, the sidewall of one of adjusting shaft and connecting cover is provided with engagement groove, the sidewall of another of adjusting shaft and connecting cover is provided with the engagement ball that can bounce, engagement ball is clamped into corresponding engagement groove along radial under the action of elastic force, to this transmission adjusting shaft and the torsion force in threshold range between connecting cover. Rotating adjusting shaft can drive the rotating shaft of connecting cover, potentiometer, when rotating shaft rotates to zero position, with the continuous rotation of adjusting shaft, the torsion between adjusting shaft and connecting cover will exceed threshold range, engagement ball will bounce and exit from engagement groove at this time, so that adjusting shaft idling occurs. The utility model does not need to know the best torsion of rotating shaft, just need to control adjusting shaft constantly rotating to realize the zero of rotating shaft, and not easy to cause excessive torsion to rotating shaft, so that potentiometer is not easy to damage.

Description

Technical Field

[0001] This utility model relates to the field of potentiometer technology, and in particular, to a mechanical zero-adjustment structure for a potentiometer. Background Technology

[0002] A potentiometer, also known as a variable resistor, is an electronic component that changes the resistance or output voltage by adjusting the position of brushes on a resistive element. It consists of a resistive element and a sliding / rotating system, typically containing three leads. Its core function is voltage division or resistance variation. By manually rotating the shaft or sliding the slider, the position of the moving contact is dynamically adjusted, thereby precisely controlling the voltage, current, or signal strength in a circuit.

[0003] In practical applications of potentiometers, it is easy to encounter situations where the current position of the rotating shaft is unclear. This makes it difficult to control the potentiometer, especially when it is impossible to use appropriate torque to rotate the shaft. For example, if the torque is too low, the shaft will not rotate to the zero position; while if the torque is too high, it can easily damage the potentiometer. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mechanical zero-adjustment structure for a potentiometer.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A potentiometer mechanical zeroing structure includes a connecting cover attached to the rotating shaft of the potentiometer. An adjusting shaft is engaged inside the connecting cover. A engagement groove is provided on the side wall of one of the adjusting shaft and the connecting cover. A spring-loaded engagement ball is provided on the side wall of the other of the adjusting shaft and the connecting cover. The engagement ball is radially engaged into the corresponding engagement groove under the action of elastic force, thereby transmitting torque within a threshold range between the adjusting shaft and the connecting cover.

[0007] Preferably, it also includes a bracket for mounting the potentiometer, and the adjustment shaft is rotatably connected to the bracket.

[0008] Preferably, the adjusting shaft is adapted to rotate via a motor drive.

[0009] Preferably, the engagement groove is disposed through the side wall of the connecting cover.

[0010] Preferably, a mounting hole is provided on the side wall of the adjusting shaft, a spring is adapted to fit in the mounting hole, and the engaging ball is disposed at the end of the spring.

[0011] Preferably, the motor is a servo motor.

[0012] Preferably, the adjusting shaft includes a driving part and a connecting part in sequence along the axial direction, the driving part is engaged with the connecting cover, and the connecting part is sleeved on the output shaft of the motor.

[0013] Preferably, a waist-shaped groove is provided through the side wall of the connecting part, and a connecting screw is adapted in the waist-shaped groove. The connecting screw passes through the waist-shaped groove and is fixed to the output shaft of the motor.

[0014] Preferably, the joint groove and the joint ball are provided in a plurality of circumferential directions.

[0015] Preferably, the support is a frame structure.

[0016] The beneficial effects of this invention are as follows: Rotating the adjusting shaft can drive the connecting cover and the potentiometer's rotating shaft to rotate. When the shaft rotates to the zero position, as the adjusting shaft continues to rotate, the torque between the adjusting shaft and the connecting cover will exceed the threshold range. At this point, the engaging ball will bounce and disengage from the engaging groove, causing the adjusting shaft to idle. Compared with the prior art, this invention does not require knowing the optimal torque of the rotating shaft; it only needs to control the continuous rotation of the adjusting shaft to achieve zero rotation and is less likely to cause excessive torque to the shaft, thus preventing damage to the potentiometer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0018] Figure 2 This is a schematic diagram of the structure of the joining sphere.

[0019] Reference numerals: 1. Connecting cover; 2. Adjusting shaft; 3. Engaging groove; 4. Engaging ball; 5. Bracket; 6. Motor; 7. Mounting hole; 9. Drive unit; 10. Connecting unit; 11. Waist-shaped groove; 12. Connecting screw; 13. Potentiometer; 14. Rotating shaft. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 , Figure 2As shown, a potentiometer mechanical zero-adjustment structure includes a bracket 5 for mounting a potentiometer 13. For example, the potentiometer 13 can be mounted to the side of the bracket 5 by means of a nut press-fit or bolt fixing. A connecting cover 1 is also adapted and attached to the rotating shaft 14 of the potentiometer 13. An adjusting shaft 2 is rotatably mounted on the bracket 5 opposite to the connecting cover 1, and the adjusting shaft 2 extends into and engages within the connecting cover 1. Torque transmission is achieved between the connecting cover 1 and the adjusting shaft 2 through a disengageable overload connection mechanism.

[0022] For example, the overload connection mechanism may include a mating groove 3 disposed on the side wall of one of the adjusting shaft 2 and the connecting cover 1, and a mating ball 4 resiliently disposed on the side wall of the other of the adjusting shaft 2 and the connecting cover 1. Figure 2 As can be seen, the engaging ball 4 is radially inserted into the corresponding engaging groove 3 under the action of elastic force. If the adjusting shaft 2 is driven to rotate at this time, it can be imagined that the shaft 14 of the connecting cover 1 and the potentiometer 13 will rotate under the push of the engaging ball 4.

[0023] However, the torque transmitted between the coupling ball 4 and the coupling groove 3 is limited by the magnitude of the elastic force received by the coupling ball 4. Once the torque between the two exceeds the circumferential component of the elastic force received by the coupling ball 4, the coupling ball 4 will bounce and disengage from the coupling groove 3, thereby breaking the torque transmission between the two.

[0024] When potentiometer 13 is zeroed, the adjustment shaft 2 can be driven to rotate in the zeroing direction without controlling the torque of the adjustment shaft 2, that is, without controlling the rotation angle and force of the adjustment shaft 2. When the shaft 14 rotates to the zero position, the rotational freedom of the shaft 14 is restricted, which will cause the torque on the engagement ball 4 to exceed the threshold range. Subsequently, the engagement ball 4 will bounce and disengage from the engagement groove 3, causing the adjustment shaft 2 to spin freely.

[0025] In some embodiments, the engagement groove 3 is specifically formed on the inner wall of the connecting cover 1, and the engagement ball 4 is correspondingly disposed on the outer wall of the adjusting shaft 2. Preferably, the engagement groove 3 adopts a through-hole design, which is more conducive to the manufacturing and processing of the connecting cover 1; and the outer wall of the adjusting shaft 2 is provided with a mounting hole 7, and a spring is disposed in the mounting hole 7, with the engagement ball 4 disposed at the end of the spring.

[0026] For example, the engagement groove 3 and the engagement ball 4 are both adapted to be arranged in a circumferential direction. The torque between the adjustment shaft 2 and the connecting cover 1 can be transmitted more stably and reliably through the one-to-one snapping of the engagement ball 4 and the engagement groove 3.

[0027] In other embodiments, the bracket 5 is preferably a frame-shaped bracket, and a motor 6 is also disposed on the bracket 5 opposite to the potentiometer 13, with the adjustment shaft 2 adapted to be attached to the output shaft of the motor 6. Thus, for example, the forward rotation of the motor 6 can drive the potentiometer 13 to zero. In a preferred example, the motor 6 can also be adapted to be a servo motor, which can drive the adjustment shaft 2 to rotate with higher rotational precision, thereby adjusting the resistance value of the potentiometer 13 more precisely.

[0028] For example, the adjusting shaft 2 is preferably adapted to include a driving part 9 and a connecting part 10 in sequence along the axial direction, wherein the driving part 9 is used to extend into the connecting cover 1, and the engaging ball 4 is correspondingly disposed on the outer wall of the driving part 9; while the connecting part 10 is adapted to be connected to the output shaft of the motor 6, so that the motor 6 can drive the adjusting shaft 2 to rotate.

[0029] In a preferred embodiment, a waist-shaped groove 11 is provided through the side wall of the connecting part 10, and the connecting screw 12 passes through the waist-shaped groove 11 and is screwed to the output shaft of the motor 6. On the one hand, when the connecting screw 12 is tightened, the output shaft of the motor 6 will stably drive the adjusting shaft 2 to rotate; on the other hand, the connecting screw 12 can be loosened and the engagement depth between the connecting part 10 and the output shaft can be adjusted, thereby adjusting the engagement ball 4 to accurately engage in the engagement groove 3, thus preventing the engagement ball 4 from failing to engage correctly in the engagement groove 3 due to machining errors.

[0030] In cases where possible, potentiometer 13 is connected to a high-voltage environment, and adjustment shaft 2 is preferably made of insulating material. In particular, multiple discs can be cut between drive part 9 and connecting part 10 to increase creepage distance and prevent high voltage from being transmitted to the motor 6 side and damaging the motor 6.

[0031] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A mechanical zeroing structure for a potentiometer, characterized by: The device includes a connecting cover (1) attached to the rotating shaft of a potentiometer. An adjusting shaft (2) is engaged inside the connecting cover (1). A engagement groove (3) is provided on the side wall of one of the adjusting shaft (2) and the connecting cover (1). A springy engagement ball (4) is provided on the side wall of the other of the adjusting shaft (2) and the connecting cover (1). The engagement ball (4) is radially engaged into the corresponding engagement groove (3) under the action of elastic force, thereby transmitting torque within a threshold range between the adjusting shaft (2) and the connecting cover (1).

2. The potentiometer mechanical zeroing structure according to claim 1, characterized in that: It also includes a bracket (5) for mounting a potentiometer, to which the adjustment shaft (2) is rotatably connected.

3. A potentiometer mechanical zeroing structure according to claim 1 or 2, characterized in that: The adjusting shaft (2) is adapted to rotate via a motor (6).

4. A potentiometer mechanical zeroing structure according to claim 1 or 2, characterized in that: The joint groove (3) is disposed through the side wall of the connecting cover (1).

5. A potentiometer mechanical zeroing structure according to claim 1 or 2, characterized in that: The adjusting shaft (2) has a mounting hole (7) on its side wall. A spring is fitted inside the mounting hole (7), and the engaging ball (4) is located at the end of the spring.

6. The potentiometer mechanical zeroing structure according to claim 3, characterized in that: The motor (6) is a servo motor.

7. The potentiometer mechanical zeroing structure according to claim 3, characterized in that: The adjusting shaft (2) includes a driving part (9) and a connecting part (10) in sequence along the axial direction. The driving part (9) is engaged with the connecting cover (1), and the connecting part (10) is sleeved on the output shaft of the motor (6).

8. The potentiometer mechanical zero-adjustment structure according to claim 7, characterized in that: A waist-shaped groove (11) is provided through the side wall of the connecting part (10), and a connecting screw (12) is adapted in the waist-shaped groove (11). The connecting screw (12) passes through the waist-shaped groove (11) and is fixed to the output shaft of the motor (6).

9. The potentiometer mechanical zeroing structure of claim 1, wherein: Both the joint groove (3) and the joint ball (4) are provided with several in the circumferential direction.

10. The potentiometer mechanical zeroing structure according to claim 2, characterized in that: The support (5) is a frame structure.

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