Attached switch in automobile instrument stepper motor

Abstract

The invention discloses an attached switch in an automobile instrument stepper motor, which detects zero returning of an instrument indicator. The attached switch comprises a thin metal sheet, a thick metal sheet, a metal stopper and a wing spring, wherein a terminal pin is welded on the thin metal sheet; another terminal pin is welded on the thick metal sheet and extends to the outside of a shell; and the metal stopper is tightly pressed on an output shaft with an indicator. After assembly, the output shaft passes through a central hole of the wing spring, the metal stopper is pressed on thewing spring; one side of the wing spring is pressed on the thin metal sheet, so that the two terminal pins which are welded with the thick and thin metal sheets become two ends of a switch, one end of the switch is fixedly connected with the metal stopper, and a point A of the thick metal sheet and a point B of the metal stopper are contacts of the switch. When the output shaft rotates to a certain position towards a zero returning direction, the point A of the thick metal sheet and the point B of the metal stopper contact to show that the switch is closed; and when the output shaft rotates, the point A of the thick metal sheet is separated from the point B of the metal stopper to show that the switch is separated and indicate that the indicator departs from a zero position. Thus, the aim of detecting the zero returning of the instrument indicator is fulfilled.

Description

technical field [0001] The invention relates to a detection means, and in particular to a detection means for returning the instrument pointer to zero. Background technique [0002] Because the stepper motor has no holding torque, the vibration of various meters during transportation after manufacture can easily cause the pointer of the meter to leave the zero position. Therefore, when the meter is transported to assembly through long distances, it must Automatically return to zero position. [0003] When the pointer of the car meter returns to zero, generally set the stopper at the position of the zero scale. When the pointer returns to zero, it touches the stopper. If the stepping motor continues to be driven, the pointer will continue to hit the stopper, causing the pointer to vibrate and the noise to be high. Yamato pointer rebound phenomenon. In order to overcome this phenomenon, the prior art solves the detection of pointer zero return speed and zero return from the ...

AI Technical Summary

Problems solved by technology

[0002] Because the stepper motor has no holding torque, the vibration of various meters during transportation after manufacture can easily cause the pointer of the meter to leave the zero position. Therefore, when the meter is transported to assembly through long distances, it must Automatically return to zero position

[0003] When the pointer of the car meter returns to zero, generally set the stopper at the position of the zero scale. When the pointer returns to zero, it touches the stopper. If the stepping motor continues to be driven, the pointer will continue to hit the stopper, causing the pointer to vibrate and the noise to be high. Yamato pointer rebound phenomenon

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