Vehicle Speed ​​Sensing Device

Abstract

A vehicle speed sensing device installed on a vehicle, the vehicle includes a transmission box, a surrounding wall arranged on the transmission box, a rotating shaft pivoted on the transmission box, a set of A rim, and a hub arranged on the rim. The vehicle speed sensing device includes a fixed measuring unit and a rotating unit. The fixed detection unit includes a sensor, a sensor mounting part arranged in the surrounding range of the surrounding wall, and a sensing element arranged on the sensor, the sensing element is obtained from the sensing element The center of the sensor mounting part is biased towards the center of the rotating shaft, and the sensor is positioned to face the magnetic sensor installed in the hub, and the sensor can detect the number of rotations of the magnetic sensor and convert is the vehicle speed.

Description

technical field [0001] The present invention relates to a sensing device, in particular to a vehicle speed sensing device. Background technique [0002] refer to figure 1 , is a known vehicle speed sensor 1, installed on a wheel unit 2, the outside of the vehicle speed sensor 1 is provided with a rear fork 20, the wheel unit 2 includes a wheel axle 21, a wheel axle 21 A rim 22 is connected and driven by the axle 21 to rotate, and a disc 23 is spaced apart from the rim 22 . The vehicle speed sensor 1 includes a bearing 11 mounted on the wheel shaft 21, a casing 12 arranged on the periphery of the bearing 11, a magnet set in the casing 12 and sleeved on the wheel shaft 21. The ring base 13 , a magnetic ring 14 disposed on the magnetic ring base 13 , and an induction chip 15 fixed in the casing 12 . The magnetic ring 14 can be driven by the wheel shaft 21 to rotate relative to the sensing chip 15 and is detected by the sensing chip 15 to sense the number of rotations of the ...

AI Technical Summary

Problems solved by technology

[0005] However, if figure 2 As shown, the induction axis L of the induction element 33 is towards the side of the magnetic ring 32, so when the induction element 33 is installed with a specific transmission case 41, the magnetic ring 32 must maintain a sufficiently large size to ensure The function of sensing speed, and the large-sized magnetic ring 32 also needs to cooperate with the large-sized mounting base 31, which will increase the weight and manufacturing cost

And when the size of the wheel rim 43 of the matched vehicle 4 is reduced, if the mounting seat 31 and the magnetic ring 32 are all reduced with the wheel rim 43, then the position of the induction element 33 cannot be matched unless the design of the vehicle 4 is changed. Otherwise, the components of the vehicle speed sensor 3 cannot be miniaturized

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