JPH10206108A - Rotary throttle location sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling workability by providing a wall part which regulates the location of a coned disc spring from its periphery to the upper surface of the bearing mounting part of a case. SOLUTION: A coned disc spring 42 is arranged inside a wall part 46 provided on the upper surface of the bearing mounting part 49 of a case 38, and the shaft part 37 of a rotor 34 is inserted into the bearing 39 of the case 38 from underneath. Next, the penetrating part 48 of the disc part 36 of the rotor 34 is inserted into upper end part 47 of the shaft part 37, and the upper end part 47 of the shaft part 37 is caulked to the disc part 36 to fix the rotor 34 to the shaft part 37. Then, a substrate 31 on which a resistor 32 is printed is placed to the case 38, and the connector terminal 40 of the case 38 and the terminal 33 of the substrate 31 are soldered to each other. The open part 44 of the case 38 is sealed by a cover 45. By these, it is possible to match the center of the coned disc spring 42 to that of the shaft part 37 with case, and it is possible to prevent the coned disc spring 42 from improperly engaging between the shaft part 37 of the rotor 34 and the disc part 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary throttle position sensor used for detecting the position of a throttle shaft of an internal combustion engine, for example.

[0002]

2. Description of the Related Art An internal combustion engine such as a vehicle uses a throttle valve to control the amount of air flowing into the engine. When the throttle valve is opened, a large amount of air is sucked in, and when the throttle valve is closed, a small amount of air is sucked. As a result, the speed of the engine is controlled. The throttle valve is connected to an accelerator pedal, and is controlled to open and close by the amount of depression of the accelerator pedal.

A conventional rotary throttle position sensor is disclosed in Japanese Patent Application Laid-Open No. 3-56816. Hereinafter, a conventional rotary throttle position sensor will be described with reference to the drawings. FIG. 2 is a sectional view of a conventional rotary throttle position sensor. In FIG. 2, 1
Is a substrate having a horseshoe-shaped resistor 2 on its lower surface and having terminals 3 electrically connected to the resistor 2. Reference numeral 4 denotes a rotor, a brush 5 slidingly contacting the resistor 2 of the substrate 1.
Is provided on the upper surface, and a metal or resin shaft portion 7 protruding downward from substantially the center of the disk portion 6 is provided. Reference numeral 11 denotes a cylindrical case molded of a synthetic resin having excellent heat resistance and mechanical strength such as polybutylene terephthalate mixed with glass fiber, which houses the substrate 1 and the rotor 4 and has the bottom surface of the rotor 4 on the bottom surface. A bearing 8 for fitting the shaft 7 is provided, and a connector 10 having a connector terminal 9 electrically connected by soldering or the like to the terminal 3 electrically connected to the resistor 2 is provided. ing. The rotor 4 rotates in conjunction with the shaft 7 connected by caulking or the like when the lever 15 rotates in conjunction with the rotation of the detection object, and the rotational position of the brush 5 changes as the resistance value changes. The signal is detected outside through the terminal 3 and the connector terminal 9. The connector 10 is an external connector 13 having a lead wire 12.
And an electrical output can be taken out to the outside. Reference numeral 14 denotes a disc spring having a hollow hole 17 provided so as to be sandwiched between the upper surface of the bearing 8 of the case 11 and the lower surface of the disk portion 6 of the rotor 4. The case 11
A cover 18 for closing the inside of the sensor is provided in the opening 16 on the upper surface of the sensor.

[0004] The rotor 4 has a shaft 7 on its lower surface.
And a ring-shaped protrusion 20 having a longer protrusion length than the protrusion 19, and a ring-shaped recess 21 is provided between the protrusion 19 and the ring-shaped protrusion 20. And a bearing mounting portion 2 provided around the bearing 8 on the case 11 side when assembled as a rotary throttle position sensor.
2 enters the ring-shaped recess 21 and the disc spring 1
4 urges the rotor in the thrust direction, so that the brush 5 comes into contact with the resistor 2 with a constant pressing force.

Therefore, in the above configuration, for example, when an acceleration is applied in a direction parallel to the shaft portion 7 as the rotary throttle position sensor, the rotor 4 tends to displace in the thrust direction due to its own weight. The brush 5 fixed to the rotor 4 by the disc spring 14 contacts the resistor 2 of the substrate 1 with a constant contact pressure.

[0006]

In the above-mentioned conventional configuration,
When assembling the rotary throttle position sensor, a disc spring 14 is arranged on the upper surface of the bearing 8 of the case 11 in advance,
The shaft portion 7 of the rotor 4 is inserted into the disc spring 14 and the bearing 8. Since the disc spring 14 is free on the upper surface of the bearing 8, the projections 19 and 20 provided on the lower surface of the rotor 4.
The disc spring 14 bites between the bearing and the bearing mounting portion 22, resulting in a problem of poor assemblability.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a rotary throttle position sensor with improved assemblability.

[0008]

In order to achieve the above object, a rotary throttle position sensor according to the present invention is provided with a wall for regulating the position of a disc spring from the outer periphery on an upper surface of a bearing mounting portion of a case.

According to the present invention, a rotary throttle position sensor having improved assemblability can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a substrate having a horseshoe-shaped resistor on a lower surface and having a terminal electrically connected to the resistor is provided. A disk portion provided with a slider that slides with the resistor on the upper surface, and a through hole in which a rotary shaft for coupling a throttle shaft is fitted substantially in the center of the disk portion, and is coaxial with the through hole. Having a pressing portion protruding downward from the disk portion, a bearing for accommodating the substrate and the rotor, a bearing for pivotally supporting the rotating shaft is provided on a bottom surface, and a terminal electrically connected to a terminal of the resistor. A case provided with a connector portion having connector terminals connected to the case, and provided so as to be sandwiched between an upper surface of a bearing mounting portion of the case and a lower surface of a holding portion of the rotor, and the rotary shaft penetrates the center. Disc spring having a hollow hole to be formed, And a cover for closing the opening of the upper surface of the case, and a wall portion for storing the disc spring on the upper surface of the bearing mounting portion of the case and for regulating the position of the disc spring from the outer periphery is provided. Does not get caught between the shaft portion of the rotor and the disk portion.

A rotary throttle position sensor according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a rotary throttle position sensor according to an embodiment of the present invention.

In FIG. 1, reference numeral 31 denotes a horseshoe-shaped resistor 3
2 is a resin substrate provided with a resistor 32 and a terminal 33 electrically connected to the resistor 32 on the lower surface. Reference numeral 34 denotes a rotor, which is a resin-made disk portion 36 provided on the upper surface with a brush 35 that is in sliding contact with the resistor 32 of the substrate 31, and a metal or resin-made portion protruding downward from substantially the center of the disk portion 36. And a shaft portion 37. Reference numeral 38 denotes a cylindrical case molded of a synthetic resin having excellent heat resistance and mechanical strength such as polybutylene terephthalate mixed with glass fiber, which houses the substrate 31 and the rotor 34, and has the rotor bottom on the inner bottom surface. And a connector terminal 4 electrically connected to the terminal 33 electrically connected to the resistor 32 by soldering or the like.
A connector portion 41 having 0 is provided. Reference numeral 42 denotes a coned disc spring having a hollow hole 43 in the center, which is disposed in a concave portion formed by a ring-shaped wall portion 46 provided on the upper surface of a bearing mounting portion 49 of the case 38, and into which the shaft portion 37 is fitted. The rotor 34 is held by a ring-shaped pressing portion 50 provided on the lower surface of the disk portion 36 of the combined rotor 34. The case 38
A cover 45 for closing the inside of the sensor is provided in the open part 44 on the upper surface of the sensor.

In the above configuration, for example, when acceleration is applied in a direction parallel to the shaft portion 37 as a rotary throttle position sensor, the rotor 34 tends to displace in the thrust direction due to its own weight. 4
2. The brush 35 fixed to the rotor 34 by
Is in contact with the resistor 32 of the substrate 31 at a constant contact pressure. Since the wall portion 46 is provided on the upper surface of the bearing 39 of the case 38 and is provided over the entire circumference for housing the disc spring 42, the disc spring 42 is attached to the shaft portion of the rotor 34 during assembly. The position is regulated with respect to 37, and there is an effect that there is no possibility of being caught between the disk portion 36 and the shaft portion 37 of the rotor 34.

In the rotary throttle position sensor according to one embodiment of the present invention, the bearing 3
Although the wall portion 46 is provided on the entire upper surface of the upper surface 9, the wall portion 46 may be provided at, for example, three points on the outer periphery of the upper surface so that the disc spring 42 does not protrude outside. It goes without saying that it is good.

A method of assembling a rotary throttle position sensor according to an embodiment of the present invention will be described with reference to the drawings. First, the bearing mounting portion 49 of the case 38
The disc spring 42 is arranged inside the wall portion 46 provided on the upper surface of the case 38, and the shaft portion 37 of the rotor 34 is inserted into the bearing 39 of the case 38 from the lower surface. Next, the through hole 4 of the disk portion 36 of the rotor 34 is formed in the upper end portion 47 of the shaft portion 37.
8 and insert the upper end 47 of the shaft 37 into the disk 3
6 to fix the rotor 34 to the shaft portion 37. Next, the board 31 on which the resistor 32 is printed is mounted on the case 38, and the connector terminals 40 of the case 38 and the terminals 33 of the board 31 are soldered. Next, the open portion 44 of the case 38 is sealed with the cover 45. In this manner, the position of the disc spring 42 is regulated from the outer periphery by the wall portion 46 of the case 38,
The hollow hole 43 of the disc spring 42 and the rotor 34
In order to insert the shaft portion 37 of the rotor 34 into the through hole 48 and caulk the upper end portion 47 of the shaft portion 37 to the disk portion 36, the center between the disc spring 42 and the shaft portion 37 is set. The disc springs 42 can be easily matched with each other, and the disc springs 42 do not bite between the shaft portion 37 of the rotor 34 and the disk portion 36 during assembly.

The rotary throttle position sensor assembled as described above fixes the case 38 to a mating throttle body (not shown). And the rotor 34
The shaft portion 37 is rotated by stepping on or releasing an accelerator of a motor vehicle (not shown), the rotor 34 is rotated in synchronization with the rotation, and the brush 35 attached to the rotor 34 is rotated. By changing the contact position of the substrate 31 with the resistor 32, a voltage corresponding to the contact position is obtained at the connector terminal 40, and the change in the voltage is used as a signal to reduce the amount of fuel injected into the engine. You can control.

[0017]

As described above, the rotary throttle position sensor of the present invention can regulate the position of the disc spring with respect to the center of the rotor during assembly. It is possible to provide a rotating throttle position sensor with improved reliability, which is free from being caught between the bearings.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a conventional rotary throttle position sensor.

FIG. 3 is an enlarged sectional view of a main part of the sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 Substrate 32 Resistor 33 Terminal 34 Rotor 35 Brush 36 Disk part 37 Shaft part 38 Case 39 Bearing 40 Connector terminal 41 Connector part 42 Disc spring 43 Hollow hole 44 Opening part 45 Cover 46 Wall part 49 Bearing mounting part 50 Holding part

Claims (1)

[Claims] 1. A substrate having a horseshoe-shaped resistor on a lower surface, a terminal having terminals electrically connected to the resistor, and a slider sliding on the resistor on the substrate is provided on an upper surface. A disc portion and a through hole in which a rotary shaft for connecting a throttle shaft is fitted substantially at the center of the disc portion, and a pressing portion protruding below the disc portion so as to be coaxial with the through hole. And a connector housing the substrate and the rotor, a bearing provided on the bottom surface for pivotally supporting the rotating shaft, and a connector portion having a connector terminal electrically connected to a terminal of the resistor. A disc spring provided between the upper surface of the bearing mounting portion of the case and the lower surface of the pressing portion of the rotor, and having a hollow hole in the center through which the rotary shaft passes; And a cover for closing the opening of the A rotary throttle position sensor having a wall portion for storing the disc spring on an upper surface of a bearing mounting portion of the case and for regulating a position of the disc spring from an outer periphery;