JP2003120335A - Suction control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction control device reducing wear of a stopper member and a lever by reducing stress concentration on an operation end part of an elastic member such as a torsion coil spring. SOLUTION: This suction control device includes the elastic member 113 energizing a throttle shaft 103 in a closing direction, two operation end parts 113a, 113b provided to face to the elastic member 113 and energized in a direction to approach each other, a stopper member 119 provided on the throttle body to be press contacted on the two operation end parts, a rotary lever 121 provided on a throttle shaft side and maintaining default opening of the throttle shaft under a condition that the same is press contacted on the two operation end parts, and a driving means 109 driving the rotary lever 121 to rotate the throttle shaft. Protection covers 115, 117 relieving contact pressure of the stopper member 119 and the rotary lever 121 are provided on each operation end part of the elastic member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake control device for electrically driving a throttle opening, and the throttle opening is set to a predetermined opening in a slightly opening direction (hereinafter referred to as a default opening). (Referred to as "degree").

[0002]

2. Description of the Related Art A throttle valve is normally biased in a closing direction, and if the intake control device fails, the throttle valve will be closed to an idling state and the engine speed will suddenly decrease. In such a case, if the default opening is set, the operation at low speed can be continued and the emergency avoidance operation can be performed. In addition, it is possible to prevent the throttle valve from freezing or being stuck due to deposits.

As an intake control device in which such a default opening is set, a structure is adopted in which the throttle shaft is held at a predetermined opening by opposing two springs having different biasing forces. That is, a spring for constantly biasing the throttle opening in the fully closed direction and a spring for constantly biasing the throttle opening in the fully open direction act simultaneously on the throttle shaft. The default opening is set according to the difference in force between the springs. With such a configuration, there is a problem that it is difficult to reduce the size of the entire device because the dimensions of the spring must be increased.

As a means for solving this problem, a throttle valve control device 1 shown in FIG. 6 of Japanese Patent Laid-Open No. 2001-82181 is known. In FIG. 6, a disc arm 3 is eccentrically mounted on a throttle shaft 2 of a throttle valve (not shown) that opens and closes an intake passage of an engine, and is attached to the disc arm 3 in parallel with the throttle shaft 2. A round bar-shaped lever 4 is provided upright. In addition, the throttle body (not shown) has a plate 5
Is fixed to the plate 5, and a column is erected on the plate 5 in parallel with the lever 4, and the annular portion 6a of the torsion coil spring 6 is attached to the column. Both ends of the torsion coil spring 6 extend from the annular portion 6a to extend into the two operating ends 6b, 6
It is c. The two operating ends 6b and 6c are urged toward each other by the elasticity of the torsion coil spring 6.

The default opening adjuster 8 comprises a pedestal 9 fixed to the plate 5 and a bolt 10 which is screwed into a screw hole of the pedestal 9 and whose tip is engaged with the stopper member 7. The stopper member 7 can be moved forward and backward in the direction of the arrow (the length direction of the bolt 10) in the figure by moving the bolt 10 forward and backward, whereby the default opening can be adjusted. The operating ends 6b and 6c press and sandwich the stopper member 7 and the lever 4 from both sides.

FIG. 7 is a diagram schematically showing FIG. 6 viewed from the direction of arrow C. FIG. 7A shows the initial state, that is, the throttle opening is at the default opening, and FIG.
Shows when the throttle opening is fully opened (the operating end 6b is at the position of the broken line) and when the throttle opening is at the idling opening (the operating end 6c is at the position of the alternate long and short dash line).

When the throttle opening is fully opened, the throttle shaft 2, that is, the lever 4 is rotated counterclockwise as shown in FIG. Counterclockwise, rotate clockwise to the position shown by the dotted line on the right side of the figure. At this time, the other operating end 6c of the torsion coil spring 6 is held stationary by the stopper member 7 at the position indicated by the solid line. Then, since the pressing force from the operating end portion 6c does not act on the lever 4, the return time of the lever 4 to the default opening position is shortened.

Next, when the throttle opening is set to the idling opening, the lever 4 is rotated in the clockwise direction and the operating end portion 6c on the opposite side is twisted against the reaction force of the torsion coil spring 6 to the left end of the drawing. Rotate counterclockwise to the position indicated by the alternate long and short dash line on the side. At this time, the other operating end 6b is held stationary by the stopper member 7 at the position indicated by the solid line,
As described above, the pressing force from the operating end portion 6b does not act on the lever 4, and the return time of the lever 4 to the default opening position is shortened.

With such a structure, the elastic means is sufficient with only one torsion coil spring 6, and the intake control device can be downsized.

[0010]

However, in such a structure, when the idle opening degree or the fully opened state shown in FIG. 7B is returned to the default opening degree shown in FIG. The operating ends 6b and 6c of 6 collide with the stopper member 7 each time, and the lever 4 is also impacted. For example, this is the case when the user accidentally steps off the accelerator pedal. Since the stopper member 7 is made of aluminum die-cast and is soft and the torsion coil spring 6 is made of spring steel and hard, the stopper member 7 is easily worn. Further, in the torsion coil spring 6, the working ends 6b and 6c may be deformed.

If such a state continues, the operating end 6b,
A gap is formed between 6c and the stopper member 7, and the throttle valve cannot be held at the default opening, so that the engine speed becomes unstable.

The present invention is intended to solve such a problem and reduces the concentration of stress on the torsion coil spring 6, reduces the wear of the stopper member 7 and the lever 4, and reduces the operating end portion 6.
It is an object of the present invention to provide an intake control device capable of preventing a gap from being formed between b and 6c and the stopper member 7.

[0013]

In order to achieve the above-mentioned object, an intake control device of the present invention comprises a throttle body having an intake passage, a throttle valve rotatably provided in the intake passage, A throttle shaft for rotating a throttle valve, a rotary lever provided on the throttle shaft for rotating the throttle shaft, an operating end portion for urging the rotary lever in an opening direction and an operating end portion for urging in a closing direction. Each of the above-mentioned torsion coil springs includes: a torsion coil spring having: a stopper member that is pressed against the two operating ends from both sides to define a default opening degree of the throttle shaft; It is characterized in that the end portion is provided with means for relaxing contact pressure with the stopper member and the rotary lever.

The throttle shaft penetrates the annular portion of the torsion coil spring, and protective covers for covering one end and one operating end of the annular portion are attached to both sides of the torsion coil spring, and the protective covers relax the contact pressure. It can be configured as a means.

At least the operating end of the torsion coil spring may be composed of a plurality of wire rods, and the plurality of wire rods may serve as the contact pressure alleviating means, so that the plurality of wire rods simultaneously come into pressure contact with the stopper member and the rotary lever. Good.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a main part of an intake air control device 100 of the present invention. Throttle body 1 shown in the figure
Although not shown, there is an intake passage having a circular cross section in 01, and a disc-shaped throttle valve is inserted into this intake passage. The throttle valve has its center fixed to the throttle shaft 103, and is rotatable to open and close the intake passage.

In the throttle shaft 103, bearing bosses 105 formed on both sides of the throttle body 101 (only one is shown in FIG. 1) are inserted from the side of the illustrated bearing boss 105, and the other side is shown. It penetrates through the bearing boss which is not formed, and is supported by ball bearings fitted in the bearing bosses 105 on both sides to be rotatable.

A throttle gear 107 is fixed to one end of the throttle shaft 103, and when the throttle shaft 103 is set in a predetermined position of the throttle body 101, a gear 11 of a motor 109 as a driving means.
It will mesh with 1.

Before inserting the tip of the throttle shaft 103 into the bearing boss 105, the throttle shaft 1
03, a torsion coil spring 113 as elastic means,
A cover 115 as a contact pressure relaxing means before and after that,
117 is inserted.

The torsion coil spring 113 is formed by winding a spring steel into a coil shape, and both operating end portions 113a and 113b corresponding to the winding start and winding end of the coil are bent and projected. The covers 115 and 117 have projecting portions 115a and 117a for accommodating the operating ends 113a and 113b of the torsion coil spring 113, respectively, in the main body portion that covers one end of the annular portion of the torsion coil spring 113. The covers 115 and 117 are covered from the front and rear sides of the torsion coil spring 113, and the operating end portions 113a and 113b are attached to the projecting portion 11.
5a and 117a. The material of the covers 115 and 117 is not particularly limited, but if they are made of synthetic resin, they can be easily manufactured.

Below the bearing boss 105 of the throttle body 101, a default boss 119 as a stopper member is erected substantially parallel to the throttle shaft 103. Also, on the throttle shaft 103 side,
A default lever 121 as a rotary lever is provided upright from the throttle gear 107. This default lever 121 is also substantially parallel to the throttle shaft 103.

FIG. 2 is a view as seen from AA in FIG. 1, and illustrates a method of inserting the torsion coil spring 113 and the covers 115 and 117 into the throttle shaft 103 and setting them at a predetermined position of the throttle body 101. It is a figure. Figure 2
2A shows the state just before setting, and FIG. 2B shows the state after setting.

The torsion coil spring 113 is brought into a natural state in which no external force is applied, and the covers 115, 11 are provided from both front and rear sides thereof.
In the state in which 7 is covered, as shown in FIG. 2A, both operating end portions 113a and 113b of the torsion coil spring 113 are in a crossed state. Therefore, the protrusion 115a of the cover 115 is moved to the left in the drawing, and the protrusion 117 of the cover 117 is placed.
A is rotated rightward in the drawing against the torsional force of the torsion coil spring 113 so that the default boss 119 and the default lever 121 are inserted between the two protrusions 115a and 117a. Default boss 119 and default lever 12
1 has almost the same width, and as shown in FIG.
15A and the protruding portion 117a are simultaneously pressed. The throttle opening in this state is the default opening. The operating end 113a is the default lever 12
1 is urged in the closing direction, and the operating end 113b urges the default lever 121 in the opening direction.

From the position of FIG. 2B, the default lever 1
When 21 rotates clockwise and reaches the position 121 'shown by the alternate long and short dash line, the protrusion 115a of the cover 115 is also 11
The position of 5a 'is reached, and the opening degree of the throttle shaft 103 is fully opened.

From the position shown in FIG. 2B, the default lever 1
When 21 rotates slightly counterclockwise, the other cover 11
The protrusion 117a of No. 7 rotates, and 117 shown by a dashed line
When the position a'is reached, the idling opening degree is reached.

Conventionally, the operating ends 113a and 113b of the torsion coil spring 113 are in direct contact with the default boss 119 and the default lever 121, so these contact portions are point contact or line contact. In contrast,
In the above embodiment, the working end 1 of the torsion coil spring 113 is
Since 13a and 113b are in contact with the default boss 119 and the default lever 121 through the covers 115 and 117, they are almost in surface contact with each other, and it is possible to reduce wear of mutual contact surfaces.

Since the covers 115 and 117 have a ring portion for covering the annular portion of the torsion coil spring 113,
The torsion coil spring 113 suppresses the distortion of the inner diameter when the torsion coil spring 113 elastically deforms, and the torsion coil spring 113 prevents the throttle shaft 1 from moving.
It is also possible to prevent the direct contact with 03.
Further, conventionally, the operating ends 113a and 113b also had to be bent accurately in order to increase the contact area as much as possible, but in the present invention, since they are housed in the covers 115 and 117, they need to be bent with such high accuracy. Is gone.

FIG. 3 is an exploded perspective view of a main part of the intake control device 100 according to the second embodiment of the present invention. In the embodiment shown in FIG. 1, the torsion coil spring 113 is a single wire (spring steel wire).
However, in the torsion coil spring 133 of this embodiment, one wire (spring steel wire) is bent in the middle to form 2
It is formed by winding a wire rod formed into a book. The two operating end portions 133a and 133b of the torsion coil spring 133 are also doubled. The wire rods are arranged in a plane parallel to the length direction of the throttle shaft 103 so that the cover 115,
If there is no 117, it is a direction in which a plurality of wires are pressed against the default boss 119 and the default lever 121 at the same time.

With this structure, the operating end 133 is
Since the number of contacts between the a and 133b and the covers 115 and 117 is from one wire to two, the contact area can be increased and the wear of the contact portion can be reduced. Further, in the case of this configuration, the covers 115 and 117 are eliminated and the operating end 133 is eliminated.
Even if the a, 133b, the default boss 119, and the default lever 121 are brought into direct pressure contact with each other, the contact area is larger than that of the operating end of the conventional single wire, so that wear can be reduced. In this embodiment, the torsion coil spring 1
Although the coiled wire 33 is used in a doubled manner, only the both operating ends may be folded back in a doubled shape. When the covers 115 and 117 are not used, the contact pressure mitigating means is composed of a plurality of spring steel wires of the operating end portions 133a and 133b.

FIG. 4 is an exploded perspective view of a main part of an intake air control device according to a third embodiment of the present invention, and FIG. 5 is a view of the intake air control device of FIG. 4 assembled and viewed from BB of FIG. is there. In this embodiment, the working end 113c of the torsion coil spring 113 on the throttle body 101 side is the torsion coil spring 113.
Protruding above. The cover 117 also rotates about 180 °, and the protrusion 117a is directed upward. On the throttle body 101, in addition to the default boss 119 of the embodiment of FIG. 1, another default boss 120 is provided upright on the opposite side of the bearing boss 105.

Also in the throttle gear 107, in addition to the default lever 121 of the embodiment shown in FIG. 1, a second default lever 122 is provided upright on the opposite side of the throttle shaft 103.

Although not shown, default bosses 119 and 120 are provided in the assembled state of the intake control device of FIG.
The default levers 121 and 122 are arranged in a line on a straight line passing through the center of the throttle shaft 103. Then, when aligned in a straight line, the operating end 113 is provided on the default boss 120 and the default lever 122 on the upper side of FIG.
c presses from the left side of the drawing to urge the throttle shaft 103 in the opening direction. On the other hand, the default boss 1 on the lower side
19 and the default lever 121 have an operating end 113a.
Is pressed from the left side of the drawing, and the throttle shaft 10
3 is biased in the closing direction. And the operating end 113
The throttle valve maintains the default opening because the a and 113c are in pressure contact with the default bosses 119 and 120.

As shown in FIG. 5A, when the throttle shaft 103 rotates counterclockwise, the default lever 122 moves the operating end 113c against the twisting force,
Rotate the throttle valve to the idling position.
As shown in FIG. 5B, when the throttle shaft 103 rotates clockwise, the lower default lever 121 moves the operating end portion 113a to rotate the throttle valve in the opening direction.

[0034]

As described above, the intake control device of the present invention has the contact pressure easing means at the working end of the torsion coil spring which is in pressure contact with the rotary lever and the stopper member. It has become possible to reduce wear of the lever and prevent deformation of the working end of the torsion coil spring.

If a protective cover for covering one end of the annular portion of the torsion coil spring and one of the operating ends is attached to both sides of the torsion coil spring, and the protective covers serve as the contact pressure alleviating means, the operating end is provided. Since the stopper member and the rotary lever are in contact with each other via the protective cover, these contact portions are almost in surface contact with each other, and it is possible to reduce wear of mutual contact surfaces.

Further, since the protective cover covers the annular portion of the torsion coil spring, the distortion of the inner diameter when the torsion coil spring elastically deforms is suppressed, and the torsion coil spring can be prevented from directly contacting the throttle shaft. It will be possible.

Further, in the past, the operating end had to be bent accurately in order to increase the contact area as much as possible, but in the present invention, since it is housed in the cover, there is no need to bend it with such high precision. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of an intake air control device of the present invention.

FIG. 2 is a view seen from AA in FIG. 1, illustrating a method of inserting a torsion coil spring and a cover into a throttle shaft and setting the throttle body at a predetermined position on the throttle body;
(A) shows just before setting, (b) shows after setting.

FIG. 3 is an exploded perspective view of essential parts in an intake air control device according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view of a main part of an intake air control device according to a third embodiment of the present invention.

5 is an assembly diagram of the intake control device of FIG. 4 and FIG.
In the figure seen from above, (a) shows the time of idling and (b) shows the time of rotation in the opening direction.

FIG. 6 is a perspective view of a main portion of a conventional intake control device having a default opening.

7 is a diagram showing a state in which the throttle opening is changed in the intake control device of FIG. 6, (a) being an initial state, and (b).
[Fig. 4] is a diagram for explaining a case where the throttle opening is fully opened and a case where the throttle opening is an idling opening.

[Explanation of symbols]

100 Intake control device 101 throttle body 103 Throttle shaft 113, 133 torsion coil spring 113a, 113b, 113c Working end 119,120 Default boss (stopper member) 121,122 Default lever (rotating lever) 115, 117 cover (contact pressure reducing means) 133a, 133b Working end (contact pressure relief means)

Claims (3)

[Claims] 1. A throttle body having an intake passage,
A throttle valve that is rotatably provided in the intake passage, a throttle shaft that rotates the throttle valve, a rotary lever that is provided on the throttle shaft and that rotates the throttle shaft, and an opening direction of the rotary lever. And a stopper member for locking the biasing force of the two operating ends when the throttle shaft is at the default opening. And an actuator for driving the rotary lever, and means for reducing contact pressure between the stopper member and the rotary lever is provided at each operating end of the torsion coil spring. 2. The throttle shaft extends through the annular portion of the torsion coil spring, and protective covers for covering one end of the annular portion and one working end are attached to both sides of the torsion coil spring, and the protective covers are in contact with each other. The intake control device according to claim 1, wherein the intake control device is a pressure relief means. 3. At least the working end portion is composed of a plurality of wire rods forming a torsion coil spring, and the plurality of wire rods serve as the contact pressure alleviating means, and the plurality of wire rods simultaneously serve as the stopper member and the rotary lever. The intake control device according to claim 1, wherein the intake control device is pressed.