JPH048279Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application: The present invention relates to a throttle opening detection device for a throttle valve that is linked to the accelerator of an automobile.

Problems to be Solved by the Prior Art and Ideas: Conventionally, a contact potentiometer has been used as a device for detecting the throttle opening of a throttle valve, and its schematic configuration is as shown in FIG. However, the brush 5 interlocking with the rotating shaft 3 of the opening/closing disc 2 of the throttle valve 4 provided inside the intake pipe 1 slides on the linear resistor 6 to detect the throttle opening of the throttle valve 4. However, the wear of the brush 5 was significant and there was a problem with durability.

Means for solving the problem: The present invention eliminates the detection means based on such a sliding contact action and devises a non-contact detection means. That is, one end of the rotating shaft of the opening/closing disc is extended to the outside of the intake pipe wall, the extended end is pivotally supported by a large-diameter cylindrical body, and a triangular rubber magnet plate is attached to the outer peripheral surface of the cylindrical body. It is characterized in that a magnetoresistive potentiometer, which is wrapped around the rubber magnet plate and converts the change in the magnetic field of the rubber magnet plate caused by the rotation of the rotating shaft into an electric signal, is disposed in a non-contact manner with respect to the magnetic plate.

Embodiment: To explain an embodiment of the present invention, FIG. 1 is a perspective view of a throttle valve 14 consisting of a rotating shaft 13 that extends through and supports an opening/closing disc 12, and the extending portion 8 of the rotating shaft 13 has a diameter. It is possible to connect the concavity and convexity with the omitted circular portion 9 of the shaft hole of the large cylindrical body 15. FIG. 2 is a perspective view showing a state in which a rubber magnet plate 16 is wound around the outer peripheral surface of the large-diameter cylindrical portion 15. It has a triangular shape, such as an isosceles triangle, and is wrapped using its magnetic attraction. As shown in FIGS. 3 and 4, a magnetoresistive potentiometer 17 is attached to the magnet plate 16 with a slight gap therebetween. This potentiometer 17 generally consists of a pair of magnetoresistive elements 19 connected in series on a permanent magnet 18, and the entire body is molded with resin, and a power supply terminal 20 is connected to one end of the magnetoresistive element 19. , the other end is grounded. Further, an output terminal 21 is connected between the magnetoresistive elements. Therefore, when the throttle valve is opened by stepping on the accelerator, the opening degree is measured as follows. In other words, the triangular shape of the rubber magnet plate wrapped around the outer periphery of the cylindrical body of the rotating shaft has a width proportional to the rotation angle of the rotating shaft, that is, the throttle valve, from the base to the apex, or vice versa. The width of the magnet plate rotates along with the rotation axis, and the magnetic field applied to the corresponding magnetic resistance element of the potentiometer also changes in proportion to the rotation angle of the rotation axis, and this magnetic field change is converted into a voltage change at the center of the resistance element. It will be taken out from the output terminal.

Effects of the invention: (a) Since the potentiometer is a non-contact type, it has a longer service life than the conventional contact type.

(b) Since the triangular rubber magnet plate is wrapped around the outer periphery of a cylinder with a large diameter, the height of the triangle, that is, the total length of the magnet plate, can be increased, and by increasing the length corresponding to the base of the triangle, the unit The amount of magnetic field change per rotation angle can be increased, and resolution and sensitivity can be improved. Therefore, the sensitivity and accuracy can be adjusted by adjusting the length and size of the magnet plate wound around the outer periphery of the cylindrical body, making it easy to adapt to various designs.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the throttle valve according to the embodiment of the present invention;
Fig. 2 is a perspective view showing the relationship before and after the triangular rubber magnet plate is wound around the large-diameter cylindrical body of the embodiment of the present invention, Fig. 3 is a longitudinal sectional front view of the embodiment of the present invention, and Fig. 4 5 is a schematic front view of a conventional throttle valve opening detection device using a brush-linear resistor. 1, 11... Intake pipe, 2, 12... Opening/closing disc,
3, 13... Rotating shaft, 4, 14... Throttle valve, 15... Large diameter cylindrical body, 16... Triangular rubber magnet plate, 17... Magnetic resistance potentiometer.

Claims (1)

[Scope of utility model registration request] One end of the rotating shaft of the disc that opens and closes the intake pipe is extended outside the pipe wall, and the extended end pivotally supports a large-diameter cylindrical body, and a triangular rubber magnet plate is wrapped around the outer peripheral surface of the cylindrical body. A throttle valve characterized in that a magnetoresistive potentiometer is disposed in a non-contact manner with respect to the rubber magnet plate, and a magnetoresistive potentiometer that converts changes in the magnetic field of the rubber magnet plate caused by rotation of the rotation shaft into an electric signal. Throttle opening detection device.