JPH10267608A - Rotary throttle position sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts used in a rotary throttle position sensor which is used for controlling the engine of an automobile, etc., by suppressing the movement of a rotor in the vertical direction without providing any plate spring. SOLUTION: A coil spring 38 always applies a pressing force to a rotor 33 in the rewinding direction of the spring 38 while one end of the spring 38 is locked to the wall section 34 of the rotor 33 and the other end is locked to the locking section of a cover 36, and urging fore is always given to a rotor 33 in the returning direction. Since the spring 38 is incorporated in a state where the spring 38 is compressed in the thrust direction and compressed between the rotor 33 and cover 36 which respectively come into contact with the upper and lower end faces 39 of the spring 38, a rotary throttle position sensor can be constituted by using a smaller number of parts.

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 a position of a throttle shaft of an internal combustion engine.

[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, and when the throttle valve is closed, a small amount of air is sucked. Thus, 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. Hei 7-151508. Hereinafter, a conventional rotary throttle position sensor will be described with reference to the drawings. FIG. 13 is a top view of the conventional rotary throttle position sensor with a cover removed so that internal components can be seen.
Is a sectional view of the same.

[0004] In FIGS. 13 and 14, reference numeral 1 denotes a bottomed cylindrical case, which is provided from the inner wall surface to the center.
It has a pair of projections 2. Reference numeral 3 denotes a film resistor base having a resistance pattern (not shown) provided along the inner wall surface of the case 1. Reference numeral 4 denotes a connector terminal electrically connected to the film resistor base 3 and connected to the outside of the case 1. Reference numeral 5 denotes a convex-shaped rotor provided such that an initial position is determined by the pair of protrusions 2 inside the case 1. The film-shaped resistor is provided at the convex end of the rotor 5. The brush 6 is provided in sliding contact with the resistance pattern of the base 3. 7 is the case 1
A cover having an opening at the center thereof for inserting a rotary throttle shaft fitted to the rotor 5 and sealing the opening surface of the case 1.

In the rotary throttle position sensor having such a configuration, the rotor 5 is locked at the initial position by the pair of projections 2 provided on the case 1, and the rotor 5 is initially positioned in the rotational direction. The position of the rotor 5 and the case 1 are axially restricted.
It is configured to suppress the movement in the axial direction by a leaf spring disposed between them.

By the way, in the above-mentioned rotary throttle position sensor, instead of the method of regulating the initial position of the rotor 5 by the pair of projections 2, the initial position of the rotor 5 is suppressed by the urging force in the returning direction of the spring. Means that the spring is installed between the rotor 5 and the case 1, and when the movement of the rotor 5 in the vertical (axial) direction and the rotation direction is suppressed, the rotor 5 and the case 1
, A leaf spring (not shown) must be provided, and a coil spring must be provided between the case 1 and the rotor 5.

[0007]

In the above-mentioned conventional configuration,
Since a leaf spring and a coil spring are provided to suppress the movement of the rotor of the rotary throttle position sensor in the vertical (axial) direction and the rotation direction, there is a problem that the number of parts increases.

An object of the present invention is to solve the above-mentioned conventional problems and to suppress the movement of the rotary throttle position sensor in the vertical (axial) direction and the rotational direction with a small number of parts.

[0009]

In order to achieve the above object, a rotary throttle position sensor according to the present invention has one end locked to a support portion of a rotor and the other end locked to a lock portion of a cover.
And a spring for constantly applying a biasing force in the return direction to the rotor. The coil spring is assembled between the rotor and the cover in a state of being compressed in the thrust direction so that the rotor comes into contact with the case. It is what was constituted.

According to this configuration, an inexpensive rotary throttle position sensor having a small number of components can be provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a bottomed cylindrical case provided with a connector terminal for external connection, and provided on a side surface of an inner wall of the case. A resistor base made of a film having a resistance pattern to be electrically connected, held in the case,
A V-shaped leaf spring that presses the resistor body against the connector terminal; and a support portion that supports a brush that rotates while sliding on the bottom surface of the inner wall of the case and slides on a resistance pattern on the resistor body. And an opening through which a rotary throttle shaft fitted to the rotor is inserted at the center, and a locking portion on the lower surface to seal the opening surface of the case. Cover and
A coil spring that has one end locked to the support portion of the rotor and the other end locked to the lock portion of the cover, and constantly applies a biasing force to the rotor in a return direction. The coil spring is assembled between the rotor and the cover in a compressed state, and the lower surface of the rotor is elastically contacted with the bottom surface of the case. Suppress movement to Therefore, since the use of a leaf spring to suppress the movement of the rotor in the vertical direction is eliminated, the number of components of the rotary throttle position sensor does not increase.

According to a second aspect of the present invention, in the first aspect of the present invention, the leaf spring has a flat plate portion and a comb-shaped portion, and a bent portion provided at one end of the flat plate portion is provided with the case. Since it is sandwiched by the cover, even if an external force such as vibration is applied to the rotary throttle position sensor, the leaf spring does not move and the contact failure between the connector terminal and the resistor base does not occur.

According to a third aspect of the present invention, in the first aspect of the present invention, a groove is provided on the bottom surface of the inner wall of the case with which the lower surface of the rotor is in contact, and a lubricant is applied to the groove. This has the effect that the life of the rotary throttle position sensor is not shortened by wear due to sliding between the case and the bottom surface of the rotor.

According to a fourth aspect of the present invention, in the first aspect of the present invention, at least one projection which comes into contact with the contact rotary throttle shaft is provided in a central hole into which the rotary throttle shaft of the rotor is fitted. With this arrangement, even if the position of the mating shaft varies, the position of the rotor in the case does not change. Therefore, there is an effect that the distance between the brush and the resistor base body is not changed by the fluctuation of the rotor position, and the characteristics of the rotary throttle position sensor are not deteriorated.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a brush provided on a side surface of the rotor is fixed, and a supporting portion for locking an end of a spring is provided with a projecting portion of the case. Since the rotation restricting mechanism is configured to be in contact with the portion, it has an operation of providing a small-sized rotary throttle position sensor with a simple structure.

According to a sixth aspect of the present invention, in the first aspect of the invention, since the rotor has a cylindrical shape with a bottom, even if water or dust enters from the vicinity of the mating shaft, a sensor is provided. It has the effect of not reaching inside.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the resistor base has a step having a large curvature provided at an end in a longitudinal direction provided on an inner wall of a case. Since it is configured to abut on the circumferential end of the portion, the resistor base can be securely adhered along the inner side surface of the case. Therefore, there is an effect that the resistance base does not rise from the inner side surface of the case and the characteristics of the rotary throttle position sensor are not deteriorated.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the connector terminal is provided with a concave portion on the surface of the resistor base contacting the electrode and on the bottom surface of the case. Since the resin portion of the case is buried in the case, the routing portion of the pattern of the resistor base does not come into contact with the connector terminal. Therefore, there is an effect that the characteristics of the rotary throttle position sensor are not deteriorated by the short circuit between the connector terminal and the pattern of the resistor base.

According to a ninth aspect of the present invention, in the first aspect, the supporting portion provided on the side surface of the rotor has a wall portion for holding the outer surface of the spring. There is an effect that the spring does not fall down due to the movement and slides on the case and wears, so that the characteristics of the rotary throttle position sensor are not deteriorated.

(Embodiment) 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 an exploded perspective view of a rotary throttle position sensor according to an embodiment of the present invention, FIG. 2 is a top view showing a state where a cover of the rotary throttle position sensor, which is a principal part thereof, is removed, and FIG. It is sectional drawing.

In FIG. 1 to FIG. 3, reference numeral 21 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. Several connector terminals 22 for external connection are incorporated by insert molding. One end of the connector terminal 22 is exposed inside the case 21, and the other end is a part of an outer peripheral surface of the case 21. The connector 23 is provided so as to project from the connector 23. Further, a ring-shaped flange 24 is formed on the outer peripheral surface of the case 21, and a mounting portion 26 having a mounting hole 25 is provided at a part of the flange 24 at a position facing each other. Reference numeral 27 denotes a resistor base provided on the side surface of the inner wall of the case 21. Several resistor patterns 28 are provided on one side of a resin film such as a polyimide film.
An electrode 29 made of a mixture of Ag and a phenol resin for contacting the connector terminal 22 to establish electrical continuity is formed at the end of the electrode 8 by printing or the like. 30
Is a V-shaped plate spring made of stainless steel or the like that holds the resistor base 27 in the case 21, and has a flat plate portion 31 on one surface and a comb-shaped portion 32 on the other surface. The connection of the electrode 29 of the resistor body 27 to the connector terminal 22 is performed by pressing the electrode 29 against the exposed portion of the connector terminal 22 inside the case 21 by incorporating the leaf spring 30. Have been done. Reference numeral 33 denotes a rotor made of a synthetic resin such as polybutylene terephthalate mixed with glass fibers and incorporated in the case 21. The rotor 33 is provided with a support portion 40 having a wall portion 34 protruding outward at an intermediate portion of the outer peripheral surface, and the tip of the support portion 40 having the wall portion 34 The brush 35 that is in contact with and slides by the rotation of the rotor 33 is attached. A cover 36 made of a synthetic resin such as polybutylene terephthalate mixed with glass fibers is attached to the opening of the case 21 in which the resistor base 27, the leaf spring 30, and the rotor 33 are incorporated. . An opening 37 through which a throttle shaft (not shown) on the other side is inserted is provided at the center of the cover 36. Reference numeral 38 denotes a coil spring that has one end locked to the support portion 40 of the rotor 33 and the other end locked to the locking portion 41 of the cover 36, and constantly applies a biasing force to the rotor 33 in the returning direction.
The coil spring 38 is assembled between the rotor 33 and the cover 36 in a state of being compressed in the thrust direction, and is configured so that the lower surface of the rotor 33 abuts on the bottom surface of the case 21. . Therefore, it is not necessary to separately provide a leaf spring that suppresses the rotor in the axial direction, and it has an effect of providing an inexpensive rotary throttle position sensor with a small number of components.

FIG. 4 is a perspective view of a leaf spring which is the main part. 4, a bent portion 51 sandwiched between the case 21 and the cover 36 is provided at an end of the flat plate portion 31 of the leaf spring 30. Therefore, even when an external force such as vibration is applied to the rotary throttle position sensor, the leaf spring 3
0 moves and the connector terminal 22 and the resistor body 2
7 has the effect of preventing the occurrence of poor contact with 7.

FIG. 5 is a top view of a case which is the main part. In FIG. 5, an inner bottom surface 61 of the case 21 has a guide concave portion into which a guide protrusion provided on the lower surface of the rotor 33 enters, and a groove portion 62 is provided around the concave portion.
Since the lubricant 63 is applied to 2, the sliding throttle body has the effect of not shortening the life of the rotary throttle position sensor due to wear caused by sliding between the case 21 and the bottom surface of the rotor 33.

FIG. 6 is a top view showing a state where the throttle shaft of the other party is inserted into the rotor which is the main part and the cover is removed, and FIG. It is sectional drawing which shows the state which inserted. 6 and 7, the rotor 33
Are provided with a pair of projections 72 in contact with the rotary throttle shaft 71. Therefore, for example, even if the position of the mating shaft moves in the XX direction as shown in FIG. 6, the position of the rotor 33 in the case 21 does not change. That is, the distance between the brush 35 and the resistor base 27 is not changed by the change in the position of the rotor 33, so that the characteristic of the rotary throttle position sensor is not deteriorated.

FIG. 8 is a partially cutaway perspective view showing a state in which a spring is locked to a rotor, which is a main part of the rotary throttle position sensor, and attached to a case. 1 and 8, the brush 35 is fixed to the side surface of the rotor 33, the wall portion 34 abuts on the protrusion 81 of the case 21, and locks the end 82 of the coil spring 38.
Is provided, it has an effect of providing a small-sized rotary throttle position sensor with a simple structure.

Since the wall portion 34 provided on the side surface of the rotor 33 holds the outer surface of the coil spring 38, the rotation of the rotor 33 prevents the coil spring 38 from falling down. . Therefore, there is an effect that the characteristics of the rotary throttle position sensor are not deteriorated.

FIG. 9 is a sectional view of a rotor which is the main part. In FIG. 9, since the rotor 33 has the bottomed portion 91, even if water or dust tries to enter from the vicinity of the mating shaft, it does not reach the inside of the sensor.

FIG. 10 is a top view showing a state in which a resistor base is inserted into a rotary throttle position sensor, which is the main part. In FIG. 10, the resistor base 27 is made of a film, and a fixed portion 91 having a large curvature is provided at the longitudinal end of the film.
Can be adhered along the inner surface of the case 21. Therefore, there is an effect that the resistance base 27 does not rise from the inner side surface of the case 21 and the characteristics of the rotary throttle position sensor do not deteriorate.

FIG. 11 is a side view of a connector terminal which is the main part. FIG. 12 is a cross-sectional view showing a state where the connector terminal, which is the main part, is integrally formed with the case. 11 and 12, the connector terminal 22 is provided with a concave portion 102 on the side surface of the resistor body 27 that contacts the electrode 29 and on the bottom surface side of the case 21. The concave portion 102 is formed of a resin for the case 21. Since it is configured to be embedded by the portion 103, the pattern leading portion 1 of the pattern of the resistor body 27 is provided.
04 and the connector terminal 22 do not abut. Therefore, the connector terminal 22 and the resistance pattern 28 of the resistor base 27 are not short-circuited, and the characteristic of the rotary throttle position sensor is not deteriorated.

The rotary throttle position sensor thus constructed is assembled in advance and press-fitted while being positioned on a throttle shaft (not shown) near the internal combustion engine, and the rotor 33 is completely inserted into the rotary throttle shaft. The case 21 is fixed to a throttle body (not shown) using the mounting portion 26 of the case 21 in a state where the case 21 is fitted to the case 21 to complete the assembly. As a result, a rotary throttle shaft (not shown) is rotated by depressing an accelerator or making it free, and the rotor 33 rotates in synchronization with the rotation, and the brush 35 attached to the rotor 33 is By changing the contact position of the resistor base 27 with the resistance pattern 28, a voltage corresponding to the contact position is obtained at the connector terminal 22, and the amount of fuel injected into the engine as a signal of the change in the voltage is obtained. Can be controlled.

[0032]

As described above, according to the present invention, the coil spring comes into contact with the rotor and the cover at the end face and is compressed, so that an inexpensive rotary throttle position sensor having a small number of parts can be provided. .

[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 top view showing a state where a cover of a rotary throttle position sensor, which is the main part, is removed.

FIG. 3 is a sectional view of the same.

FIG. 4 is a perspective view of a leaf spring, which is an essential part of the same.

FIG. 5 is a top view of a case which is the main part.

FIG. 6 is a top view showing a state where a mating throttle shaft is inserted into a rotor which is a main part of the same.

FIG. 7 is a cross-sectional view showing a state where a mating shaft is inserted into a rotary throttle position sensor, which is a main part of the same.

FIG. 8 is a sectional perspective view showing a state in which a spring is locked to a rotor, which is a main part of the rotary throttle position sensor, and the rotor is attached to a case.

FIG. 9 is a sectional view of a rotor which is a main part of the same.

FIG. 10 is a top view showing a state in which a resistor base is attached to a case, which is a main part of the same

FIG. 11 is a side view of a connector terminal which is a main part of the same.

FIG. 12 is a sectional view showing a state where the resistor base is mounted on a case in which the connector terminal, which is the main part, is integrally molded.

FIG. 13 is a top view showing a state where a cover of a conventional rotary throttle position sensor is removed.

FIG. 14 is a sectional view of the same.

[Explanation of symbols]

 21 Case 22 Connector Terminal 27 Resistor Base 28 Resistance Pattern 29 Electrode 30 Leaf Spring 33 Rotor 34 Wall 35 Brush 36 Cover 38 Coil Spring 51 Bent 62 Groove 63 Lubricant 71 Mating Throttle Shaft 72 Projection 81 Projection 82 End part 91 Bottom part 102 Concave part 103 Protection part 104 Routing part

Claims (9)

[Claims] 1. A bottomed cylindrical case provided with a connector terminal for external connection, provided on a side surface of an inner wall of the case,
A resistor base made of a film having a resistance pattern electrically connected to the connector terminal; a V-shaped leaf spring held in the case and pressing the resistor base against the connector terminal; A rotor provided so as to slide out on the bottom surface of the inner wall of the case and to support a brush that comes into sliding contact with the resistance pattern on the resistor base so as to protrude outward; A cover having an opening through which the rotary throttle shaft is inserted and having a locking portion on the lower surface, the cover sealing the opening surface of the case, and one end locked to the support portion of the rotor and the other end of the cover. A coil spring that is locked to a locking portion and constantly applies a biasing force in the return direction to the rotor;
The coil spring is assembled between the rotor and the cover while being compressed in the thrust direction, and is configured to apply an urging force so that the lower surface of the rotor is in contact with the bottom surface of the inner wall of the case. Rotary throttle position sensor. 2. The rotary throttle position sensor according to claim 1, wherein the leaf spring has a flat plate portion and a comb-shaped portion, and a bent portion provided at one end of the flat plate portion is sandwiched between the case and the cover. 3. The rotary throttle position sensor according to claim 1, wherein a groove is provided on the bottom surface of the inner wall of the case with which the lower surface of the rotor is in contact, and a lubricant is applied to the groove. 4. The rotary throttle position sensor according to claim 1, wherein at least one protrusion that abuts on the abutting rotary throttle shaft is provided in a central hole into which the rotary throttle shaft of the rotor is fitted. 5. The rotating device according to claim 1, wherein a supporting portion provided on a side surface of the rotor for fixing the brush and locking an end of the spring abuts against a stopper projection provided in the case. Throttle position sensor. 6. The rotary throttle position sensor according to claim 1, wherein the rotor has a cylindrical shape with a bottom, and the bottom of the rotor is configured to contact the bottom surface of the inner wall of the case. 7. The rotary throttle position according to claim 1, wherein the resistor body has a portion having a large curvature at an end in the longitudinal direction, and abuts against a circumferential end of a step provided on the inner wall of the case. Sensor. 8. The connector terminal according to claim 1, wherein the connector terminal is provided with a concave portion on the surface of the resistor base contacting the electrode and on the bottom surface of the case, and the resin portion of the case is embedded in the concave portion. Rotary throttle position sensor. 9. The rotary throttle position sensor according to claim 1, wherein the support provided on the side surface of the rotor has a wall for holding the outer surface of the spring.