JPH07113606A - Throttle valve openness sensor - Google Patents

Abstract

PURPOSE:To provide a throttle valve openness sensor which reduces displacement between the centers of rotor's rotation and print pattern of an openness detecting part for higher detection accuracy and also for supporting a substrate in a stable condition. CONSTITUTION:A substrate 10 is provided with an engagement hole, provided at the center of a print pattern of an openness detection part, and a joint hole, provided at an electrode part of an openness detection part and a housing 30 is provided with a substrate mount part 35, formed in intermittent projected stripe in a substrate housing chamber 31, and a substrate attaching shaft 38, provided at the rotational center of a rotor 25. A contact terminal 41 is provided with, at an inside end, a joint end part 42 and a tapered wedge part, and the engagement hole of the substrate 10 is made to engage with the substrate attaching shaft 38 so that the centers of tone throttle valve openness sensor and rotation of the rotor 25 are made identical, and the wedge part of contact terminal 41 is made to touch the opening of the joint hole, for the position of peripheral direction of the substrate 10 to be set, so the substrate 10 is attached to the housing 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve opening sensor for detecting the opening of a throttle valve of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a throttle valve opening sensor is
For example, as indicated by reference numeral 51 in FIG. 9, a substrate 52 provided with an opening detection unit (not shown) of a throttle valve, and a slide that rotates in conjunction with the throttle valve and slides on the opening detection unit. A rotor 54 having a moving contact 53, a housing 56 that rotatably supports the rotor 54, and a substrate housing chamber 55 that houses the substrate 52, and a housing 56 that is integrally formed with the housing 56 and that electrically detects an opening degree. And a connector portion 58 having a plurality of contact terminals 57 for external connection to the.

Such a throttle valve opening sensor 5
In 1, the center of the arc-shaped print pattern forming the opening detection unit and the center of rotation of the rotor 54 are accurately aligned with each other. Therefore, when the substrate 52 is housed in the substrate housing chamber 55, the opening detection unit contacts the substrate. An elastic relay member 59 having conductivity is interposed between the terminal 57 and the terminal 57 to electrically connect the two, and the spring force of the elastic relay member 59 presses the substrate 52 to one point on the peripheral edge of the substrate housing chamber 55. Then, the center of the print pattern and the center of rotation of the rotor 54 are made to coincide with each other, and the assembling is performed (for example, see Japanese Utility Model Publication No. 5-26961).

For the same purpose as described above, the applicant of the present application, in Japanese Patent Application No. 5-89486, provides a board with a fitting hole which is concentric with the center of the print pattern, and the fitting hole is formed. It fits on the outer circumference of the rotor shaft bearing provided in the substrate housing chamber to align the center of the printed pattern with the center of rotation of the rotor, and to open the throttle valve that is attached to the bottom wall of the substrate housing chamber by closely attaching the substrate. Degree sensor was proposed.

[0005]

However, in such a conventional throttle valve opening sensor, for example, in the former one, an elastic relay member is required for centering, and the substrate assembly is not required. As the number of attachment steps increases, the housing is a synthetic resin molded product, so that the dimensional error between the rotation center of the rotor and the pressure contact on the peripheral edge of the substrate housing chamber increases. Therefore, there is a problem that the center of the print pattern and the center of rotation deviate from each other and the detection accuracy is reduced.

In the latter case, the flatness of the housing bottom wall made of a synthetic resin molded product is apt to change,
There is a possibility that the substrate may be warped or tilted. Therefore, the linear relationship between the rotation angle of the rotor and the detected voltage is disturbed, the detection accuracy is reduced, and the contact pressure of the sliding contact on the opening detection part is partially changed, resulting in uneven wear of the printing pattern. There is a problem that durability is deteriorated.

The present invention has been made to solve the above problems, and an object of the present invention is to reduce the deviation between the center of the print pattern of the opening detection section and the center of rotation of the rotor. An object of the present invention is to provide a throttle valve opening sensor capable of supporting a substrate in a stable state while improving detection accuracy.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and includes a substrate having a throttle valve opening detecting portion, and a board which rotates in conjunction with the throttle valve and which opens. A rotor having a sliding contact that slides on a detection unit, a housing that rotatably supports the rotor and has a substrate housing chamber that houses the substrate, and an opening detection unit integrally formed with the housing. A throttle valve opening sensor having a connector portion having a plurality of contact terminals for electrically externally connecting the portions, wherein the substrate is an arc-shaped print pattern forming the opening detection portion. The housing is provided with a fitting hole provided concentrically with the center and a joining hole provided in the electrode portion of the opening degree detecting portion, and the housing has an outer peripheral portion of the substrate accommodating chamber formed into an intermittent ridge shape. A substrate mounting portion formed around the circumference, and a substrate mounting shaft that is provided concentrically with the rotation center of the rotor in the substrate housing chamber and can be fitted into the fitting hole of the substrate, the contact terminal, A joint end portion that can be inserted into the joint hole is provided at an inner end portion thereof, and a tapered wedge-shaped portion that can abut the opening portion of the joint hole, and the substrate is fitted on the substrate mounting shaft of the housing. When the fitting hole is fitted and the substrate is placed on the substrate placing portion, the center of the print pattern of the opening degree detecting portion and the rotation center of the rotor are set concentrically, and the joint hole of the substrate is When the joint end portion of the contact terminal is inserted, the wedge-shaped portion contacts the opening portion of the joint hole to set the circumferential position of the substrate, and the electrode portion and the joint end portion are soldered to each other to form the substrate. To the housing via contact terminals It is attached a throttle valve opening sensor according to claim.

[0009]

The present invention is configured as described above, and the board is fixedly supported on the board fixing portion by fitting the fitting hole into the board mounting shaft of the housing. As a result, the center of the print pattern of the opening degree detector and the center of rotation of the rotor are set concentrically. Further, the joint end portion of the contact terminal is inserted into the joint hole of the electrode portion of the opening degree detection portion, and the wedge-shaped portion abuts the opening portion of the joint hole, whereby
The position of the substrate in the circumferential direction is set.

Then, the electrode portion and the joint end portion are soldered, the board is fixed to the housing through the contact terminal, and the opening degree detecting portion is electrically connected to the connector portion.

The substrate stationary portion holds a stable flatness and abuts the outer peripheral portion of the substrate in an intermittent surface contact state to support the substrate in a stable posture.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the drawing, a throttle valve opening sensor indicated by reference numeral 1 is a substrate 10 having an opening detecting portion 11,
A rotor 25 having a sliding contact 29, a substrate housing chamber 31,
A housing 30 having a bearing 37 and a connector portion 40 having a plurality of contact terminals 41 are provided, the board 10 is provided with a fitting hole 20 and a joint hole 21, and the housing 30 is a board stationary portion 35 and a board mounting shaft. 38,
The contact terminal 41 includes a joining end portion 42 and a wedge-shaped portion 43.

In the embodiment, the substrate 10 is formed of a glass cloth substrate in a disc shape. In the center of the board 10, a fitting hole 20 having a diameter (for example, a fitting gap of 50 to 100 μm) that closely fits to the outer circumference of the board mounting shaft 38.
The printed pattern of the opening degree detection unit 11 is printed on one surface of the substrate 10 concentrically with the center of the fitting hole 20.

The print pattern of the opening detection section 11 is mainly formed of an arc-shaped resistor 12 and a current collector 13 made of a conductor, and the ends of the resistor 12 are each formed by the conductor 1.
It is electrically connected to the electrode parts 16 and 18 via 4 and 15, and one end of the current collector 13 is electrically connected to the electrode part 17. Further, the electrode portions 16, 17 and 18 are provided with joint holes 21 each having a predetermined diameter.

The rotor 25 has sliding contacts 29, and its rotor shaft 26 is rotatably supported by bearings 37. A connecting lever 28 that rotates in conjunction with a throttle valve (not shown) is provided at the tip of the rotor shaft 26.
It is fixed via 7. Then, as the connecting lever 28 rotates, the sliding contact 29 rotates about the rotor shaft 26 and slides on the resistor 12 and the current collector 13 of the opening degree detection unit 11 so as to move between them. It is configured to be electrically connected.

The housing 30 is made of a synthetic resin material and has an opening on one side (upper side in FIG. 1).
5 and a rotary connection chamber 33 that opens to the other side (downward in FIG. 1) and stores the disk 27 and the connection lever 28, and a connector portion 40 that is formed to extend laterally. And a shell 39 forming a part thereof. Note that reference numeral 34
Is a return spring interposed between the connecting lever 28 and the housing 30.

On the outer peripheral portion of the substrate accommodating chamber 31, there is formed a substrate stationary portion 35 for mounting the substrate 10 and supporting the outer peripheral portion. The substrate mounting portion 35 has a predetermined height from the bottom surface 32, and is formed in the shape of an interrupted ridge that makes a circle around the plurality of recesses 36. Further, a bearing 37 is provided so as to penetrate between the substrate housing chamber 31 and the rotary connection chamber 33.

The bearing 37 is formed such that one end thereof projects toward the substrate housing chamber 31 side, and a substrate mounting shaft 38 having a stepped and reduced diameter is formed on the outer peripheral portion of the projecting end. Further, the protruding height from the bottom surface 32 of the stepped portion of the substrate mounting shaft 38 is formed to be the same height as the substrate stationary portion 35.

The connector section 40 includes a shell 39 and three contact terminals 41 embedded in the housing 30.
It is formed from and. The contact terminal 41 is made of a strip-shaped metal plate material, has a width larger than the diameter of the bonding hole 21 of the substrate 10, and has an L-shaped bent inner end (the left end shown in FIGS. 1, 2, and 3). The joint end portion 42 and the wedge-shaped portion 43 are formed in the section.

The joint end portion 42 is formed to have a width that can be inserted into the joint hole 21, and a tapered wedge-shaped portion 43 is formed continuously with the joint end portion 42. The tapered shape of the wedge-shaped portion 43 is the bonding hole 2 of the substrate 10 placed on the substrate placing portion 35.
When the joining end portion 42 is inserted into 1, the wedge-shaped portion 43 abuts on the opening portion (the lower side in FIG. 7) of the joining hole 21 to rotate the substrate 10 in the circumferential direction about the substrate mounting shaft 38. It is formed so as to define and set the position. Reference numeral 46 is a cover, which is a sealing O-ring 4 having rubber-like elasticity.
The substrate 10 is pressed onto the substrate stationary portion 35 via 7 and the opening of the substrate housing chamber 31 is sealed.

Here, in order to house the board 10 in the housing 30, the fitting holes 20 and the board mounting shaft 38 are fitted to each other, and further, the joint ends of the contact terminals 41 are inserted into the respective joint holes 21. 42 is inserted and the substrate 10 is placed on the substrate placing portion 35. As a result, the outer peripheral portion of the substrate 10 is supported by the substrate stationary portion 35, and the outer periphery of the fitting hole 20 is supported by the stepped portion of the substrate mounting shaft 38. At this time, the center of the print pattern of the opening degree detection unit 11 and the center of the board mounting shaft 38,
That is, the center of rotation of the rotor 25 exactly matches. In addition, the wedge-shaped portions 43 of each contact terminal 41 respectively abut on the insertion side opening portion of the contact hole 21, so that the circumferential position of the substrate 10, that is, the circumferential position of the opening degree detection unit 11 is set accurately. .

Then, the electrode portions 16, 17, 18 and the joint end portions 42 are soldered with the solder 45 to fix the substrate 10 to the housing 30 via the contact terminals 41, and the opening degree. The detection unit 11 is the connector unit 40.
Electrically connected to. In this way, the opening degree detection unit 1
By making the centers of the printing patterns of the resistor 12 and the current collector 13 constituting 1 coincide with the center of rotation of the rotor 25, the sliding contacts 29 attached to the rotor 25 slide concentrically on the printing pattern. Can be made.

Therefore, the linear relationship between the rotation angle of the throttle valve and the detected voltage is accurately maintained, and the detection accuracy of the throttle valve opening sensor 1 is improved. Further, since the width of the joint end portion 42 is narrower than that of the main portion of the contact terminal 41, the joint end portion 42 absorbs thermal expansion of the contact terminal 41 and the influence thereof is prevented from spreading to the substrate 10. .

Further, since the substrate stationary portion 35 is formed in the shape of an intermittent ridge, deformation of the molding of the housing 30 is avoided, the flatness of the supporting contact portion of the substrate 10 is maintained, and intermittently. Since the substrate 10 is supported in a flat surface contact state,
The influence of warpage and inclination on the mounted substrate 10 is prevented. Therefore, the flatness of the substrate 10 can be maintained, and the contact pressure of the sliding contact 29 with the opening degree detection unit 11 can be maintained constant.

The present invention is not limited to the above description and the illustrated examples, and its embodiment can be modified without departing from the technical idea of the present invention. For example, the opening detection unit may be provided with a specific opening detection unit that detects the idle position of the throttle valve and the like. Further, the substrate mounting shaft may be formed integrally with the housing on the outer circumference of the rotor bearing. Further, the wedge-shaped portion of the contact terminal is, for example, the reference numeral 4 in FIG.
As shown by 4, it may be formed by a curved curve.

[0027]

As described above, according to the throttle valve opening sensor of the present invention, the board is provided with the fitting hole concentric with the center of the printing pattern of the opening detecting portion, and the housing is provided with the center of rotation of the rotor. A concentric board mounting shaft is provided, and both are fitted and set concentrically, and the wedge-shaped part of the contact terminal of the connector part is brought into contact with the joint hole of the electrode part of the opening degree detection part so that the board Because it is a configuration that sets the circumferential position,
It is possible to reduce the deviation between the center of the print pattern of the opening degree detection unit and the center of rotation of the rotor. Therefore, the linear relationship between the rotation of the throttle valve and the detected voltage can be maintained accurately, and the detection accuracy of the throttle valve opening sensor can be improved.

Further, the substrate stationary portion for stationary supporting the substrate is formed in the shape of an intermittent ridge to avoid the deformation of the housing molding, enhance the flatness of the contact portion with the substrate, and achieve the intermittent surface contact. Since the substrate is fixedly supported in this state, the influence of deformation of the housing such as warpage can be prevented and the substrate can be supported in a stable state. Therefore, high detection accuracy can be maintained, the contact pressure of the contact contact can be kept constant, uneven wear can be prevented, and the durability of the throttle valve opening sensor can be improved.

Further, as in the conventional example, the elastic relay member interposed between the substrate and the contact terminal can be omitted for centering, and the number of steps for assembling the substrate can be reduced. Play.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway plan view of the same.

FIG. 3 is a plan view of a housing.

FIG. 4 is a plan view of a substrate.

FIG. 5 is a side view of a contact terminal.

FIG. 6 is a view on arrow B of FIG.

FIG. 7 is a partial cross-sectional view taken along the arrow A in FIG. 1 showing a joint portion between a joint hole of a substrate and a contact terminal.

FIG. 8 is a diagram showing an example of the shape of another contact terminal.

FIG. 9 is a side sectional view showing an example of a conventional throttle valve opening sensor.

[Explanation of symbols]

 1 Throttle Valve Opening Sensor 10 Board 11 Opening Detecting Section 16, 17, 18 Electrode Section 20 Fitting Hole 21 Joining Hole 25 Rotor 29 Sliding Contact 30 Housing 31 Board Housing Chamber 35 Board Stationary Section 38 Board Mounting Shaft 40 Connector Section 41 Contact Terminal 42 Joined End 43 Wedge

Claims (1)

[Claims] 1. A substrate having a throttle valve opening detection unit, a rotor having a sliding contact that rotates in conjunction with the throttle valve and slides on the opening detection unit, and the rotor is rotated. A housing having a substrate accommodation chamber that supports the substrate and accommodates the substrate, and a connector portion integrally formed with the housing and having a plurality of contact terminals for electrically externally connecting the opening degree detection portion, A throttle valve opening sensor including: a board, wherein the substrate is a fitting hole provided concentrically with a center of an arc-shaped print pattern forming the opening detecting section; and an electrode section of the opening detecting section. The housing is provided with a joining hole provided in the substrate housing chamber, and the housing is configured to rotate the rotor in the substrate housing chamber. A board mounting shaft that is concentrically provided with the board and that can be fitted into the fitting hole of the board; and the contact terminal has a joining end portion that can be inserted into the joining hole at an inner end portion thereof, and a joining hole of the joining hole. A tapered wedge-shaped portion capable of abutting the opening, the fitting hole of the board is fitted to the board mounting shaft of the housing, and the board is fixed on the board stationary portion. The center of the print pattern of the opening degree detection unit and the center of rotation of the rotor are set concentrically, the joint end of the contact terminal is inserted into the joint hole of the substrate, and the wedge-shaped portion is the opening of the joint hole. The throttle valve opening is characterized in that the circumferential position of the substrate is set by abutting against the substrate, the electrode portion and the joint end portion are soldered, and the substrate is attached to the housing through a contact terminal. Degree sensor.