JPH0618635U - Throttle sensor for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] The concentricity between the rotor 9 and the arc-shaped resistor provided on the sensor case 10 side is increased to obtain desired characteristics. [Structure] A throttle sensor 1 includes a rotor 9 fitted to an end of a throttle shaft 3 and a throttle chamber 2.
The brush 19 of the rotor 9 is in sliding contact with the arc-shaped resistor of the substrate 15.
A bearing hole 16 through which the throttle shaft 3 is rotatably fitted is formed through the center of the bottom surface of the sensor case 10, and the fitting causes the sensor case 10 to be positioned with reference to the throttle shaft 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a throttle sensor that detects a throttle valve opening of an internal combustion engine.

[0002]

[Prior art]

 A throttle sensor using a potentiometer has been conventionally used to detect the opening degree of a throttle valve of an internal combustion engine. As shown in FIG. 4, this throttle sensor is roughly composed of a sensor case 22 fixed to the side surface of the throttle chamber 21 and a rotor 24 fitted and attached to the end of the throttle shaft 23. Therefore, the brush 25 supported by the rotor 24 is brought into sliding contact with an arc-shaped resistor (not shown) provided on the sensor case 22 side, and an output corresponding to the throttle valve opening is obtained. There is. Here, a cylindrical portion 26 centering on the throttle shaft 23 is provided on the bottom surface of the sensor case 22, and a circular mounting hole 27 is formed on the side surface of the throttle chamber 21 so as to surround the throttle shaft 23. The sensor case 22 is positioned inside by fitting the cylindrical portion 26 relatively tightly. The rotor 24 is rotatably supported by a bearing recess 28 provided in the cover 31 of the sensor case 22 and a cylindrical bearing 29 provided on the bottom surface side. Reference numeral 30 is a return spring that biases the rotor 24 in one direction of rotation, and the biasing force absorbs the play between the throttle shaft 23 and the rotor 24.

[0003]

[Problems to be solved by the device]

 The throttle shaft 23 is rotatably supported in the throttle chamber 21 via, for example, ball bearings, but the mounting hole 27 of the throttle chamber 21 and the throttle shaft 23 are not necessarily concentric. Therefore, unless the play of the fitting portion between the rotor 24 and the throttle shaft 23 and the clearance between the rotor 24 and the cylindrical bearing portion 29 or the bearing recess 28 are set to be relatively large, the rotor when the throttle shaft 23 turns. 24 may not move smoothly and the output according to the throttle valve opening may not be obtained accurately. However, if the above play or clearance is set to a large value, the concentric relationship between the rotation of the rotor 24, that is, the rotation locus of the brush 25 and the arc of the resistor is likely to change, and the detection accuracy of the throttle valve opening is lowered. There is a defect.

[0004]

[Means for Solving the Problems]

 Therefore, this invention has a throttle sensor for an internal combustion engine that has a rotor fitted to the end of the throttle shaft and a sensor case fixed to the slot chamber, and the brush of the rotor is in sliding contact with the resistor on the sensor case side. In the above, the bottom surface of the sensor case is provided with a bearing hole into which the throttle shaft is rotatably fitted, and the mounting position of the sensor case is determined by fitting the bearing hole and the throttle shaft. I am trying.

[0005]

[Action]

 The sensor case is positioned by fitting a bearing hole on the bottom surface of the sensor case and the throttle shaft, and then fixed to the throttle chamber. Therefore, the throttle shaft is positioned with reference to it. As a result, the arc of the resistor provided in the sensor case and the center of the throttle shaft are surely concentric.

[0006]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

2 and 3 show the configuration of a throttle chamber 2 provided with a throttle sensor 1 according to the present invention.

The throttle shaft 3 is arranged across the intake passage 4 of the throttle chamber 2, and a disc-shaped throttle valve 5 is attached to the central portion of the throttle shaft 3 and both ends thereof are respectively ball bearings. It is rotatably supported by the throttle chamber 2 via 6. A throttle drum 8 is attached to one end of the throttle shaft 3 together with a return spring 7, and a throttle sensor 1 is arranged at the end opposite to the throttle drum 8.

The throttle sensor 1 is roughly composed of a rotor 9 fitted and attached to the end of the throttle shaft 3 and a sensor case 10 fixed to the outer surface of the throttle chamber 2. As shown in FIG. 2, the sensor case 10 has a connector portion 11 on one side, and a pair of flange portions 12 is fixed to the slot chamber 2 with screws 13. Further, as shown in FIG. 1, the outer opening is closed by a cover 14 which is a separate body, and a resistor and a conductor (not shown) are printed and formed in an arc shape on the inside of the board 15. Is fixed. A circular bearing hole 16 into which the throttle shaft 3 is rotatably fitted is formed through the center of the bottom surface of the sensor case 10, and the fitting of the bearing hole 16 and the throttle shaft 3 is used as a reference. The mounting position of the sensor case 10 is positioned. That is, there is a sufficient margin in the hole of the flange portion 12 through which the screw 13 passes, and the screw hole 13 is fastened after the bearing hole 16 and the throttle shaft 3 are fitted and positioned. Further, a cylindrical bearing portion 17 is provided so as to surround the bearing hole 16 inside the bottom surface portion of the sensor case 10, and a bearing recess 18 is formed in the cover 14 so as to face the bearing portion 16. .

The shaft portion 9 a of the rotor 9 is rotatably fitted in the cylindrical bearing portion 17 and the bearing recess 18, and the plate portion 9 b facing the substrate 15 is in sliding contact with the resistor and the conductor. A pair of brushes 19 is provided. The rotor 9 is fitted to the end portion of the throttle shaft 3 which has a D-shaped cross section. The return spring 20 formed of a coil spring is urged in one direction of rotation so that the play of the fitting portion with the throttle shaft 3 is absorbed.

According to the configuration of the above embodiment, the sensor case 10 of the throttle sensor 1 is positioned by the bearing hole 16 with the throttle shaft 3 as a reference, so that the arc-shaped resistor of the substrate 15 fixed to the sensor case 10 is Concentricity with the rotor 9 is surely obtained, and the output characteristic with respect to the throttle valve opening becomes very accurate. Further, since the concentricity between the cylindrical bearing portion 17 and the like and the rotor 9 is increased, the throttle shaft 3 always operates smoothly, the output of the rotor 9 is prevented from being loosened, and early wear of each portion is prevented. To be done.

[0012]

[Effect of device]

 As is clear from the above description, according to the throttle sensor for an internal combustion engine according to the present invention, the sensor case is always positioned by the bearing hole with respect to the throttle shaft. Is reliably obtained, and the output characteristic with respect to the throttle valve opening becomes extremely accurate. In addition, the operation of the rotor becomes smooth and wear of each part is prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a throttle sensor according to the present invention.

FIG. 2 is a sectional view of a throttle chamber including the throttle sensor.

FIG. 3 is a front view of the throttle chamber.

FIG. 4 is a sectional view of a conventional throttle sensor.

[Explanation of symbols]

 1 ... Throttle sensor 3 ... Throttle shaft 9 ... Rotor 10 ... Sensor case 15 ... Substrate 16 ... Bearing hole 19 ... Brush

Claims (1)

[Scope of utility model registration request] 1. A throttle sensor for an internal combustion engine, comprising: a rotor fitted to an end of a throttle shaft; and a sensor case fixed to a throttle chamber, wherein a brush of the rotor is in sliding contact with a resistor on the sensor case side. An internal combustion engine characterized in that a bearing hole into which the throttle shaft is rotatably fitted is provided on a bottom surface of the sensor case, and a mounting position of the sensor case is determined by fitting the bearing hole and the throttle shaft. Engine throttle sensor.