JPH11295019A - Rotary throttle position sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize output characteristic even if a strong vibration is applied, by providing a space part where one end part of a base body of a resistor is inserted into a blend cylindrical casing and a pressing spring intervening the other end part of the base body of the resistor. SOLUTION: A casing 11 is formed by arranging a connector terminal 13 in a molding die and flowing in a thermoplastic resin. Next, a resistance paste containing a binder resin is printed in a base body 20 of a resistor, and sintered to form a resistance pattern and an electrode. Next, the resistor 20 is inserted into an inside face of the casing 11 from upwardly thereof. In this case, one end part of the base body 20 is positioned at a plate spring insertion part 17 so that an electrode is abutted on one end part of the connector terminal 13, the other end is positioned at a space part 18, and a top end of the other end part of the base body 20 is inserted into a holding channel 19 for holding it. Next, a plate spring 23 is inserted into a plate spring part 17, and an electrode of the base body 20 is brought into pressure contact with the connector terminal 13. Next, a pressing spring 27 is inserted into the space part 18, and the other end part of the base body 20 is held in the space part 18.

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.

[0002]

2. Description of the Related Art Generally, 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, 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 of this type is disclosed in Japanese Patent Application Laid-Open No. 7-151508.

A conventional rotary throttle position sensor will be described below with reference to the drawings.

FIG. 4 is a top view showing the internal structure of a conventional rotary throttle position sensor, and FIG. 5 is a sectional side view showing the same.

4 and 5, reference numeral 1 denotes a cylindrical case having a bottom, and a connector portion 2 is provided so as to protrude outward from a side surface of the case 1. The connector portion 2 has connector terminals. The connector terminal 3 has one end disposed inside the case 1 and the other end protruding outward in the connector portion 2. Reference numeral 4 denotes a film-shaped resistor substrate.
Is provided so as to be in contact with the inner wall surface of the case 1, and a resistance pattern (not shown) is provided on a surface of the resistor body 4 which is not in contact with the inner wall surface of the case 1. Reference numeral 5 denotes a metal leaf spring. The leaf spring 5 is inserted from the opening side of the case 1, and the resistor base 4 is connected to one end of the connector terminal 3 inside the case 1 by the leaf spring 5. Part. Reference numeral 6 denotes a resin rotor. The rotor 6 is rotatably housed inside the case 1 and has a brush 7 provided on a side surface. The brush 7 is connected to a resistance pattern (not shown) of the resistor base 4. ). Further, a recess 8 is provided inside the rotor 6 to be fitted with a mating rotary throttle shaft (not shown). 9 is a resin cover, which covers the opening of the case 1 and
A hole 10 is provided at substantially the center, and a mating rotary throttle shaft (not shown) is inserted into the hole 10.

[0007] Next, the operation of the rotary throttle position sensor configured as described above will be described.

A mating rotary throttle shaft (not shown) in the vicinity of the internal combustion engine is pressed into the recess 8 of the rotor 6, and the rotor 6 rotates in synchronization with the rotation of the mating rotary throttle shaft (not shown). By changing the contact position of the brush 7 attached to the rotor 6 with a resistance pattern (not shown) of the resistor base 4, an output voltage corresponding to the contact position of the brush 7 is obtained at the connector terminal 3. The change in the output voltage is used as a signal to control the amount of fuel injected into the engine.

[0009]

However, in the above-described conventional configuration, one end of the resistor base 4 is connected to the leaf spring 5.
Is pressed against one end of the connector terminal 3, but the other end of the resistor base 4 is not fixed. Therefore, when strong vibration is applied to the rotary throttle position sensor, this vibration causes Since the end portions are shifted, the contact position between the brush 7 and a resistance pattern (not shown) on the resistor base 4 fluctuates, so that the output characteristics of the rotary throttle position sensor become unstable. Had issues.

The present invention solves the above-mentioned conventional problems. Even if strong vibration is applied to the rotary throttle position sensor, the output characteristics do not become unstable, and the rotary throttle position can stabilize the output characteristics. It is intended to provide a sensor.

[0011]

In order to achieve the above object, a rotary throttle position sensor according to the present invention has a connector in which one end of a connector terminal is disposed inside and the other end of the connector terminal projects outward. A cylindrical case with a bottom provided in the part, an electrode is provided at one end of a surface that is provided so as to be in contact with the inner wall surface of the case, and that does not abut the inner wall surface of the case, and further has the electrode on this surface. A film-shaped resistor base provided with a resistance pattern to be electrically connected, and an electrode of the resistor base inserted from the opening side of the case and one end of the connector terminal inside the case inside the case. A leaf spring that is pressed into electrical contact and electrically connected thereto, and a brush that is rotatably housed inside the case and slidably contacts the resistance pattern of the resistor body, A space for closing the opening of the case and having a cover having a hole at a substantially center thereof for inserting a mating rotary throttle shaft, wherein the other end of the resistor body is inserted into the case. And a holding spring for holding the other end of the resistor base in this space. With this configuration, even if strong vibration is applied to the rotary throttle position sensor, the output characteristics are not improved. It is possible to provide a rotary throttle position sensor capable of stabilizing output characteristics without becoming stable.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that one end of a connector terminal is arranged inside and the other end of the connector terminal is provided in a connector part projecting outward. An electrode is provided at one end of a surface which is provided so as to be in contact with the inner wall surface of the case and which is not in contact with the inner wall surface of the case, and which is further electrically connected to the electrode on this surface. A film-shaped resistor base provided with a resistance pattern, and an electrode inserted from the opening side of the case, and an electrode of the resistor base pressed against one end of the connector terminal inside the case to be electrically connected. A leaf spring to be connected, a brush rotatably housed inside the case and slidably in contact with a resistance pattern of the resistor body, and a rotor coupled to a mating rotary throttle shaft; A cover having a hole through which a mating rotary throttle shaft is inserted at substantially the center, and a space for inserting the other end of the resistor base body is provided in the case, and the space is provided in the space. According to this configuration, a holding portion for holding the other end of the resistor base is provided. According to this configuration, a space for inserting the other end of the resistor base is provided in the case, and the resistor is provided in this space. Since the presser spring for holding the other end of the base is provided, even if strong vibration is applied to the rotary throttle position sensor, the vibration does not cause the other end of the resistor base to be displaced. Since the contact position of the body base with the resistance pattern does not change, the output characteristic of the rotary throttle position sensor can be stabilized.

According to a second aspect of the present invention, a holding groove for holding the tip of the other end of the resistor base is provided on an extension of the other end of the resistor base in the space defined in the first aspect. ,
According to this configuration, since the holding groove for holding the tip of the other end of the resistor base is provided on the extension of the other end of the resistor base in the space, the other end of the resistor base is provided in this holding groove. By inserting the tip of the part, the other end of the resistor body can be positioned on the center side of the case in the space, and thereafter, in order to insert the holding spring into the space of the case, this holding spring is used. When the resistor body is inserted into the space of the case, the resistive body does not become an obstacle, and as a result, the pressing spring can be easily inserted.

Hereinafter, a rotary throttle position sensor according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a rotary throttle position sensor according to an embodiment of the present invention, and FIG. 2 is a side sectional view of the rotary throttle position sensor.

In FIG. 1 and FIG. 2, reference numeral 11 denotes a bottomed cylindrical case formed of a synthetic resin having excellent heat resistance and mechanical strength such as polybutylene terephthalate mixed with glass fibers. A connector portion 12 is provided so as to protrude outward from a part of the outer surface, and several connector terminals 1 for external connection are provided in the connector portion 12.
3 are integrated by insert molding. One end of the connector terminal 13 is connected to the case 11.
And the other end of the case 11
Inside the connector portion 12 of the connector.
In addition, a ring-shaped flange 14 is formed on the outer peripheral surface of the case 11, and a mounting portion 16 having a mounting hole 15 is provided at a part of the flange 14 at a position facing each other. Further, a leaf spring insertion portion 17 is provided near the inner side surface of the case 11, and a space 18 is provided at a position separate from the leaf spring insertion portion 17. A holding groove 19 is provided on an extension of one side surface located on the center side of the groove 11. Reference numeral 20 denotes a resistor base made of resin.
And one end of the resistor body 20 is inserted into the leaf spring insertion portion 17 of the case 11,
The other end of the resistor base 20 is inserted into the space 18 of the case 11, and the tip of the other end of the resistor base 20 is inserted and held in the holding groove 19. A resistance pattern 21 is provided on a surface of the resistor base 20 that does not contact the inner wall surface of the case 11. The resistance pattern 21 is electrically connected to an electrode 22 provided at one end of the resistor base 20. Connected. Reference numeral 23 denotes a V-shaped metal leaf spring. The leaf spring 23 is inserted from the opening side of the case 11 and the electrode 22 of the resistor body 20 is connected to the case 11 by the leaf spring 23. The inside is pressed against one end of the connector terminal 13. 24
Is a rotor made of resin.
Is rotatably housed inside the brush, and a brush 2
The brush 25 is in sliding contact with the resistance pattern 21 of the resistor base 20. Further, a concave portion 26 is provided inside the rotor 24 to be fitted with a mating rotary throttle shaft (not shown). 27 is a holding spring made of metal or resin.
7 is inserted from the opening side of the case 11, and the other end of the resistor body 20 is held inside the space 18 of the case 11 by the pressing spring 27. A cover 28 is made of resin. The cover 28 closes the opening of the case 11 and has a hole 2 substantially in the center.
9 is provided, through which a mating rotary throttle shaft (not shown) is inserted.

Next, a description will be given of a method of manufacturing the rotary throttle position sensor according to the embodiment of the present invention configured as described above.

First, after three connector terminals 13 are set in a molding die (not shown), a thermoplastic resin such as polybutylene terephthalate melted at about 260 ° C. is placed in a molding die (not shown). Pour and cool at room temperature
To form

Next, a resistor paste (not shown) containing a binder resin such as polyimide is printed on a film-shaped resistor base 20 made of a resin such as polyimide cut to a width of about 70 to 126 mm. The resist pattern 21 is formed by baking at 260 ° C. to 270 ° C. for about 1 to 126 minutes.

Next, a resistor paste (not shown) containing Ag and a binder resin such as polyimide is printed on the resistor substrate 20 on which the resistor pattern 21 is provided.
The electrode 22 is formed on the resistor substrate 20 by baking at a temperature of about 270 ° C. to about 270 ° C. for about 1 to 126 minutes.

Next, the resistor body 20 is inserted into the inner surface of the case 11 from above the case 11. In this case, one end of the resistor base 20 is connected to the leaf spring insertion portion of the case 11 so that the electrode 22 of the resistor base 20 contacts one end of the connector terminal 13 exposed inside the case 11. 17 and the resistor body 20
Is located in the space 18 of the case 11 and the other end of the resistor base 20 is connected to the case 11.
Is inserted and held in the holding groove 19 in the space 18 of FIG.

Next, the leaf spring 23 is inserted into the leaf spring insertion portion 17 of the case 11 from above, and the electrode 22 of the resistor base 20 is pressed against one end of the connector terminal 13 of the case 11.

Next, the pressing spring 27 is inserted into the space 18 of the case 11 from above, and the other end of the resistor base 20 is held in the space 18.

In this case, in one embodiment of the present invention, a holding groove 19 for holding the tip of the other end of the resistor base 20 is formed on the extension of the other end of the resistor base 20 in the space 18. 3, the other end of the resistor base 20 is inserted into the holding groove 19 to insert the other end of the resistor base 20 into the case 11 in the space 18 as shown in FIG. The holding spring 27 is inserted into the space 18 of the case 11 after that, and the holding spring 27 is inserted into the space 1 of the case 11.
The insertion of the resistor body 20 does not hinder the insertion of the resistor body 20, and as a result, the pressing spring 27 has an effect of being easily inserted.

Next, inside the case 11 provided with the resistor body 20, the leaf spring 23 and the holding spring 27,
After inserting and storing the rotor 24 to which the brush 25 is fixed in advance from above, the opening of the case 11 is closed with the cover 28.

With respect to the rotary throttle position sensor according to the embodiment of the present invention configured as described above,
Next, the operation will be described.

A rotary throttle shaft (not shown) in the vicinity of the internal combustion engine is press-fitted while aligning a concave portion 26 provided in the rotor 24 of the rotary throttle position sensor, and the throttle is mounted by using the mounting portion 16 of the case 11. The case 11 is fixed to a body main body (not shown), and the assembly is completed. The counterpart rotary throttle shaft (not shown) is rotated by depressing an accelerator pedal or releasing the accelerator, and the rotor 24 is rotated in synchronization with the rotation, and the brush 25 fixed to the rotor 24 is rotated. However, by changing the contact position of the resistor base 20 with the resistance pattern 21, an output voltage corresponding to the contact position is obtained at the connector terminal 13 via the electrode 22, and the fluctuation of the output voltage is signaled. It is possible to control the amount of fuel injected into the engine.

Here, even if strong vibration is applied to the rotary throttle position sensor, in the rotary throttle position sensor according to the embodiment of the present invention, the case 1
1 is provided with a space 18 into which the other end of the resistor body 20 is inserted, and the space 18 is provided with a pressing spring 27 for holding the other end of the resistor body 20. Since the other end of the body base 20 does not shift, the contact position between the brush 25 and the resistance pattern 21 on the resistor body 20 does not fluctuate, so that the output characteristics of the rotary throttle position sensor can be stabilized. It has the function and effect that the conversion can be achieved.

[0029]

As described above, the rotary throttle position sensor according to the present invention has a bottomed cylinder in which one end of a connector terminal is disposed inside and the other end of the connector terminal is provided in a connector projecting outward. -Shaped case and an electrode provided at one end of a surface that is provided so as to be in contact with the inner wall of the case and does not contact the inner wall of the case, and further has a resistance pattern electrically connected to the electrode on this surface. A film-shaped resistor base provided, and a plate inserted from the opening side of the case and electrically connected by pressing the electrode of the resistor base to one end of the connector terminal inside the case; A spring, a rotor rotatably housed inside the case and provided with a brush that is in sliding contact with the resistance pattern of the resistor body, and coupled to a mating rotary throttle shaft; A cover having a hole for inserting a mating rotary throttle shaft at substantially the center and providing a space for inserting the other end of the resistor body in the case; According to this configuration, a space for inserting the other end of the resistor base is provided in the case, and the resistor is provided in this space. Since the holding spring for holding the other end of the body base is provided, even if strong vibration is applied to the rotary throttle position sensor, the vibration does not cause the other end of the resistance body to be displaced. Since the contact position of the resistor base with the resistor pattern does not fluctuate, the output characteristics of the rotary throttle position sensor can be stabilized. .

[Brief description of the drawings]

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

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

FIG. 3 is a top view showing a state in which a resistor base, a leaf spring and a pressing spring are inserted into a case in the rotary throttle position sensor.

FIG. 4 is a top view of a case showing a state where a cover is removed from a conventional rotary throttle position sensor.

FIG. 5 is a side sectional view of the rotary throttle position sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Case 12 Connector part 13 Connector terminal 18 Space part 19 Holding groove 20 Resistor base 21 Resistance pattern 22 Electrode 23 Leaf spring 24 Rotor 25 Brush 27 Pressing spring 28 Cover 29 Hole

Claims (2)

[Claims] 1. A bottomed cylindrical case provided in a connector portion having one end of a connector terminal disposed inside and the other end of the connector terminal protruding outward, and abutting against an inner wall surface of the case. Provided as such, and provided with an electrode at one end of a surface that does not abut the inner wall surface of the case, furthermore, a film-shaped resistor base provided with a resistor pattern electrically connected to the electrode on this surface, A leaf spring that is inserted from the opening side of the case and that electrically connects the electrode of the resistor body to one end of the connector terminal by pressing the electrode inside the case and rotatable inside the case; A rotor that is housed in the housing and that is in sliding contact with the resistance pattern of the resistor body; A cover having a hole through which the side rotation throttle shaft is inserted, and a space for inserting the other end of the resistor base in the case, and a presser for holding the other end of the resistor base in this space. Rotary throttle position sensor with spring. 2. The rotary throttle position sensor according to claim 1, wherein a holding groove for holding the tip of the other end of the resistor base is provided on an extension of the other end of the resistor base in the space.