JPH0416227Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensor circuit board in a vehicle speed detector that rotates a magnet at a speed proportional to the vehicle speed and detects the rotational speed with a sensor.

In this type of circuit board, the sensor and the yoke are supported by the board, but it has been particularly difficult to mount the sensor loosely fitted between the yokes without vibration.

The present invention has been developed in view of the current situation, and its means include a circuit board for a vehicle speed detector in which a sensor and a yoke are supported on the circuit board.
The yoke is made into a U-shape having protrusions on both sides, and leg pieces protruding from both sides of the yoke opposite to the protrusions are inserted and locked into the circuit board to fix the yoke, and the yoke is approximately fixed. The present invention is characterized in that a sensor connected to a terminal bent in an L-shape and erected on a circuit board is disposed within the yoke, and the sensor is bonded to the yoke via resin.

Next, the example will be explained with reference to the drawings.
2 is a circuit board, 2 is a sensor, and 3 is a yoke. The yoke 3 is U-shaped with two protrusions on both sides. It is fixed by inserting and locking a pair of protruding leg pieces 3a, 3a into the base 1. The sensor 2 is disposed between the upward protruding pieces of the yoke 3, and the three terminals 4, 4, 4 of the sensor 2 are bent into a substantially L shape and penetrate the base 1. By applying and solidifying the resin 5, the sensor 2 is adhered to the yoke 3, and the terminals 4, 4, 4 are bridged and held on the yoke 3.

A cord 6 is connected to each terminal 4, 4, 4, and the circuit board 1 is mounted in a housing 8 together with a grommet 7 of the cord 6. A magnet 10 supported by a drive shaft 9 is provided within the housing 8 and faces the sensor 2.

In the figure, 11 indicates a gasket formed integrally with the grommet 7, and 12 indicates a lid body.

With the above configuration, as the magnet 10 rotates, magnetic lines of force passing through the sensor 2 and the protruding piece of the yoke 3 are generated alternately, thereby detecting the rotational speed.

Since the yoke 3 is fixed to the circuit board 1 by the leg pieces 3a bent downward from both sides thereof, it can be firmly fixed by a simple operation without using any fixing parts. Furthermore, since the sensor 2 is bonded using the resin 5, it can be fixed within the yoke 3 at an appropriate position facing the magnet 10 with a simple operation without using any fixing parts.

Since each terminal 4 is approximately L-shaped, it is easily bent during bonding, and the bonding position of the sensor 2 can be easily adjusted. In addition, by applying molten resin to each terminal 4, the terminal 4,
4, 4 are bridged and held together by resin 5 and fixed to yoke 3, and are prevented from transmitting vibrations to sensor 2 or from vibrating with sensor 2.

As described above, in the present invention, since the sensor 2 is securely fixed to the yoke 3, even if strong vibration is applied from the housing 8 side, the sensor 2 will not vibrate relative to the yoke 3. The distance of the magnet 10 does not change, and the sensor 2 is connected to the magnet 1.
Since the rotational speed can be positioned close to 0 and facing each other, the rotational speed can be accurately detected, and since it is fixed using a simple means of adhesion, it is efficient and has the advantage of not causing an increase in cost.

In addition, each member of the yoke 3, the sensor 2, the terminal 4, and the circuit board 1 can be assembled as one assembly, and this assembly can be assembled to the housing 8, making assembly and replacement easy. It has the advantage of being able to perform

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1... Circuit board, 2... Sensor, 3... Yoke, 3a... Leg piece, 4... Terminal, 5... Resin.

Claims (1)

[Scope of utility model registration request] In a circuit board for a vehicle speed detector in which a sensor 2 and a yoke 3 are supported on a circuit board 1, the yoke 3 has a U-shape with protrusions on both sides, and from both sides of the yoke 3 there is a side opposite to the protrusions. The leg pieces 3a protruding from the circuit board 1 are inserted and locked into the circuit board 1 to fix the yoke 3, and are bent into a substantially L shape to attach the circuit board 1.
A circuit board for a vehicle speed detector, characterized in that a sensor 2 connected to a terminal 4 standing upright is disposed within the yoke 3, and the sensor 2 is adhered to the yoke 3 via a resin 5.