JP4007782B2 - Intake control device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention is an intake control device that electrically drives the throttle opening, and is a type that holds the throttle opening at a predetermined opening (hereinafter referred to as a default opening) slightly in the opening direction than at the idling opening. The present invention relates to an intake control device.
[0002]
[Prior art]
The throttle valve is normally urged in the closing direction, and when the intake control device fails, the throttle valve is closed to an idling state, and the engine speed is rapidly reduced. In such a case, if the default opening is set, the operation at a low speed can be continued, and the emergency avoidance operation can be performed. In addition, the throttle valve can be prevented from freezing and sticking due to deposits.
[0003]
As an intake control device in which such a default opening is set, a configuration is adopted in which the throttle shaft is held at a predetermined opening by opposing two springs having different urging forces. That is, a spring that always urges the throttle opening in the fully closed direction and a spring that always urges the throttle opening in the fully open direction simultaneously act on the throttle shaft. The default opening is set by the difference in force between the springs. In such a configuration, there is a problem in that it is difficult to reduce the size of the entire apparatus because the dimensions of the spring must be increased.
[0004]
In order to solve this problem, a throttle valve control device 1 described in Japanese Patent Application Laid-Open No. 2001-82181 shown in FIG. 6 is known. In FIG. 6, a disc arm 3 is pivotally attached to a throttle shaft 2 of a throttle valve (not shown) that opens and closes an intake passage of the engine, and is attached to the disc arm 3 in parallel to the throttle shaft 2. A round bar-shaped lever 4 is erected. Further, a plate 5 is fixed to a throttle body (not shown), and a support column is erected on the plate 5 in parallel with the lever 4, and an annular portion 6 a of a torsion coil spring 6 is attached to the support column. Both end portions of the torsion coil spring 6 extend from the annular portion 6a to form two working end portions 6b and 6c. The two operating ends 6 b and 6 c are biased toward each other by the elasticity of the torsion coil spring 6.
[0005]
The default opening adjustment unit 8 includes a cradle 9 fixed to the plate 5 and a bolt 10 that is screwed into a screw hole of the cradle 9 and has a tip engaged with the stopper member 7. By moving the bolt 10 back and forth, the stopper member 7 can be moved back and forth in the direction of the arrow (the length direction of the bolt 10) in the figure, thereby adjusting the default opening. The operating end portions 6b and 6c press and hold the stopper member 7 and the lever 4 from both sides.
[0006]
7 is a diagram schematically showing FIG. 6 as viewed from the direction of arrow C. FIG. 7A shows an initial state, that is, when the throttle opening is at the default opening, and FIG. 7B shows the throttle opening. When the opening is fully open (the operating end 6b is a position indicated by a broken line), and when the opening is at an idling opening (the operating end 6c is a position indicated by a one-dot chain line).
[0007]
When the throttle opening is fully opened, the throttle shaft 2, that is, the lever 4 is rotated counterclockwise as shown in FIG. 5B, and the operating end 6 b is counteracted by the torsion coil spring 6. While rotating clockwise to the position indicated by the dotted line on the right end side of the figure. At this time, the other working end 6c of the torsion coil spring 6 is held in a stationary state by the stopper member 7 at a position indicated by a solid line. Since the pressing force from the operating end 6c does not act on the lever 4, the return time of the lever 4 to the default opening position is shortened.
[0008]
Next, when the throttle opening is set to the idling opening, the lever 4 is rotated in the clockwise direction, and the operating end 6c on the opposite side is shown on the left end side of the figure while resisting the drag of the torsion coil spring 6. Rotates counterclockwise to the position of the dashed line. At this time, the other operating end portion 6b is held in a stationary state at a position indicated by a solid line by the stopper member 7, and the pressing force from the operating end portion 6b against the lever 4 does not act, so that the lever 4 has a default opening position. The return time to is shortened as described above.
[0009]
With such a configuration, only one torsion coil spring 6 is sufficient as the elastic means, and the intake control device can be downsized.
[0010]
[Problems to be solved by the invention]
However, in such a configuration, when the idling opening degree shown in FIG. 7B or the fully opened state returns to the default opening degree shown in FIG. 7A, the operating ends 6b and 6c of the torsion coil spring 6 are moved. Each time, the lever 4 collides with the stopper member 7, and the lever 4 also receives an impact. For example, if you accidentally stepped off the accelerator pedal. The stopper member 7 is made of aluminum die casting and is soft, and the torsion coil spring 6 is hard and spring steel, so that the stopper member 7 is easily worn. Further, the torsion coil spring 6 may also be deformed in the operating end portions 6b and 6c.
[0011]
If such a state continues, there will be a gap between the operating ends 6b and 6c and the stopper member 7, the throttle valve cannot be held at the default opening, and the engine speed will become unstable. Become.
[0012]
The present invention has been made to solve such a problem. The concentration of stress on the torsion coil spring 6 is reduced, wear of the stopper member 7 and the lever 4 is reduced, and the operating end portions 6b and 6c and the stopper member are reduced. It is an object of the present invention to provide an intake air control device that can prevent a gap from being formed between the air intake and the air intake.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, an intake control device of the present invention includes a throttle body having an intake passage, a throttle valve rotatably provided in the intake passage, and a throttle shaft that rotates the throttle valve. A torsion coil spring having a rotating lever provided on the throttle shaft for rotating the throttle shaft, an operating end for biasing the rotating lever in the opening direction, and an operating end for biasing in the closing direction; A stopper member that is in pressure contact with the two operating ends from both sides to determine a default opening of the throttle shaft, and a driving means for the rotary lever, and the throttle shaft passes through the annular portion of the torsion coil spring ; attaching a protective cover for covering an end and one of the operating end of the annular portion on opposite sides of the torsion coil spring, the stopper member and rotating the protective cover Is characterized in that the contact pressure relieving means with the bar.
[0014]
At least the operating end of the torsion coil spring may be composed of a plurality of wires.
[0015]
DETAILED DESCRIPTION OF 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 according to the present invention. In the throttle body 101 shown in the figure, there is an intake passage having a circular cross section (not shown), and a disk-like throttle valve is inserted into the intake passage. The center of the throttle valve is fixed to the throttle shaft 103 and is rotatable to open and close the intake passage.
[0016]
The throttle shaft 103 has a bearing boss 105 formed on both sides of the throttle body 101 (only one is shown in FIG. 1) inserted from the illustrated bearing boss 105 side, and the other side is not shown. One of the bearing bosses is passed through and is supported by ball bearings fitted in the bearing bosses 105 on both sides, so that the bearing bosses can rotate freely.
[0017]
A throttle gear 107 is fixed to one end of the throttle shaft 103. When the throttle shaft 103 is placed in a predetermined position of the throttle body 101, it is engaged with a gear 111 of a motor 109 as drive means.
[0018]
Before inserting the tip of the throttle shaft 103 into the bearing boss 105, the torsion coil spring 113 as elastic means and the covers 115 and 117 as contact pressure relaxation means before and after the throttle shaft 103 are inserted. .
[0019]
The torsion coil spring 113 is formed by winding spring steel in a coil shape, and both working end portions 113a and 113b corresponding to the start and end of winding of the coil are bent and protruded. The covers 115 and 117 are formed with projecting portions 115 a and 117 a that house the working end portions 113 a and 113 b of the torsion coil spring 113 on 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 accommodated in the projecting portions 115a and 117a. The material of the covers 115 and 117 is not particularly limited, but if it is made of synthetic resin, it can be easily manufactured.
[0020]
A default boss 119 as a stopper member is erected substantially parallel to the throttle shaft 103 at a lower portion of the bearing boss 105 of the throttle body 101. A default lever 121 as a rotation lever is provided upright from the throttle gear 107 on the throttle shaft 103 side. This default lever 121 is also substantially parallel to the throttle shaft 103.
[0021]
FIG. 2 is a diagram illustrating a method of setting the throttle body 101 at a predetermined position by inserting the torsion coil spring 113 and the covers 115 and 117 into the throttle shaft 103, as viewed from AA in FIG. . FIG. 2A shows immediately before setting, and FIG. 2B shows after setting.
[0022]
In a natural state in which no external force is applied to the torsion coil spring 113 and the covers 115 and 117 are covered from the front and rear sides, as shown in FIG. 113b is in a crossed state. Therefore, the protrusion 115a of the cover 115 is rotated to the left in the figure, and the protrusion 117a of the cover 117 is rotated to the right in the figure against the twisting force of the torsion coil spring 113, so that the distance between the two protrusions 115a and 117a is increased. So that the default boss 119 and the default lever 121 are inserted. The default boss 119 and the default lever 121 have substantially the same width, and are in a state where they are pressed against both the projecting portion 115a and the projecting portion 117a at the same time as shown in FIG. The throttle opening in this state is the default opening. The operating end portion 113a biases the default lever 121 in the closing direction, and the operating end portion 113b biases the default lever 121 in the opening direction.
[0023]
When the default lever 121 rotates clockwise from the position shown in FIG. 2B and reaches the position 121 ′ indicated by the alternate long and short dash line, the protrusion 115a of the cover 115 also reaches the position 115a ′, and the throttle shaft 103 is opened. The degree is fully open.
[0024]
When the default lever 121 is slightly rotated counterclockwise from the position shown in FIG. 2B, the protruding portion 117a of the other cover 117 is rotated, and when the position reaches the position 117a ′ indicated by the alternate long and short dash line, the idling opening degree is obtained. .
[0025]
Conventionally, the operating end portions 113a and 113b of the torsion coil spring 113, the default boss 119, and the default lever 121 are in direct contact, so these contact portions are point contact or line contact. On the other hand, in the above embodiment, the operating end portions 113a and 113b of the torsion coil spring 113 and the default boss 119 and the default lever 121 are in contact with each other via the covers 115 and 117. It was possible to reduce the wear of the mutual contact surfaces.
[0026]
Further, since the covers 115 and 117 have a ring portion that covers the annular portion of the torsion coil spring 113, the distortion of the inner diameter when the torsion coil spring 113 is elastically deformed is suppressed, and the torsion coil spring 113 is attached to the throttle shaft 103. It is also possible to prevent direct contact. In addition, the operating end portions 113a and 113b have conventionally been required to be bent accurately in order to increase the contact area as much as possible. However, in the present invention, since they are accommodated in the covers 115 and 117, it is necessary to bend so accurately. Is gone.
[0027]
FIG. 3 is an exploded perspective view of the main part of the intake control device 100 according to the second embodiment of the present invention. In the embodiment of FIG. 1, the torsion coil spring 113 is formed by winding a single wire (spring steel wire). However, the torsion coil spring 133 of this embodiment has a single wire (spring steel wire) in the middle. It is formed by winding a wire rod bent into two. The two operating end portions 133a and 133b of the torsion coil spring 133 are also doubled. The arrangement direction of the wire 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 in the plane parallel to the length direction of the throttle shaft 103 unless the covers 115 and 117 are provided.
[0028]
With such a configuration, the contact between the operating end portions 133a and 133b and the covers 115 and 117 is changed from one wire to two, so that the contact area increases and the wear of the contact portion can be reduced. Further, in the case of this configuration, even if the covers 115 and 117 are eliminated and the operation ends 133a and 133b, the default boss 119, and the default lever 121 are directly pressed, the contact area is larger than that of the conventional single wire operation end. Since it increases, wear can be reduced. In this embodiment, the torsion coil spring 133 wound in a double manner is used. However, only both working end portions may be folded back. In the case where the covers 115 and 117 are not used, the configuration including the plurality of spring steel wires of the operating end portions 133a and 133b serves as the contact pressure relaxation means.
[0029]
FIG. 4 is an exploded perspective view of an essential part of the intake control device according to the third embodiment of the present invention, and FIG. 5 is a view of the intake control device of FIG. 4 assembled and viewed from BB of FIG. In this embodiment, the operating end 113 c of the torsion coil spring 113 on the throttle body 101 side protrudes above the torsion coil spring 113. The cover 117 is also rotated by approximately 180 °, and the protruding portion 117a is directed upward. In addition to the default boss 119 of the embodiment of FIG. 1, another default boss 120 is erected on the throttle body 101 on the opposite side of the bearing boss 105.
[0030]
In addition to the default lever 121 of the embodiment of FIG. 1, the throttle gear 107 is also provided with a second default lever 122 on the opposite side of the throttle shaft 103.
[0031]
In the assembled state of the intake control device of FIG. 4, although not shown, the default bosses 119 and 120 and the default levers 121 and 122 are arranged in a line on a straight line passing through the center of the throttle shaft 103. When aligned in a straight line, the operating end 113c is pressed against the default boss 120 and the default lever 122 on the upper side of FIG. 5A from the left side of the drawing to urge the throttle shaft 103 in the opening direction. . On the other hand, the operating end 113a is also pressed against the lower default boss 119 and the default lever 121 from the left side of the drawing, and urges the throttle shaft 103 in the closing direction. Then, when the operating end portions 113a and 113c are in pressure contact with the default bosses 119 and 120, the throttle valve maintains the default opening.
[0032]
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 to 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 113a and rotates the throttle valve in the opening direction.
[0033]
【The invention's effect】
As described above, the intake control device of the present invention has a configuration in which the contact pressure relaxation means is provided at the operating end of the torsion coil spring that is in pressure contact with the rotary lever and the stopper member, so that the wear of the stopper member and the rotary lever is reduced. Thus, deformation of the working end of the torsion coil spring can be prevented.
[0034]
Further, if a protective cover that covers one end of the annular portion of the torsion coil spring and one operating end is attached to both sides of the torsion coil spring and the protective cover is used as the contact pressure relaxation means, the operating end, the stopper member, Since the rotating lever is in contact via a protective cover, these contact portions are almost in surface contact, and it is possible to reduce wear on the mutual contact surfaces.
[0035]
Further, since the protective cover covers the annular portion of the torsion coil spring, it is possible to suppress the distortion of the inner diameter when the torsion coil spring is elastically deformed and to prevent the torsion coil spring from directly contacting the throttle shaft. .
[0036]
Further, the operation end portion has conventionally been required to be bent accurately in order to increase the contact area as much as possible. However, in the present invention, since it is accommodated in the cover, it is not necessary to bend with high accuracy.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a main part of an intake control device of the present invention.
FIG. 2 is a view as seen from AA in FIG. 1, illustrating a method for inserting a torsion coil spring and a cover through a throttle shaft and setting the throttle body at a predetermined position; FIG. Immediately before, (b) shows after setting.
FIG. 3 is an exploded perspective view of a main part of an intake 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 control device according to a third embodiment of the present invention.
5 is a view of the intake control device of FIG. 4 assembled and viewed from BB of FIG. 4, where (a) shows when idling and (b) shows when rotating in the opening direction.
FIG. 6 is a perspective view of a main part of a conventional intake control device having a default opening.
7 is a diagram illustrating a state in which the throttle opening is changed in the intake air control device of FIG. 6, where (a) illustrates an initial state, and (b) illustrates a case where the throttle opening is fully open and an idling opening. It is a figure to do.
[Explanation of symbols]
100 Intake Control Device 101 Throttle Body 103 Throttle Shaft 113, 133 Torsion Coil Springs 113a, 113b, 113c Operating Ends 119, 120 Default Boss (Stopper Member)
121,122 Default lever (rotating lever)
115,117 Cover (contact pressure relaxation means)
133a, 133b Working end (contact pressure relaxation means)

Claims (2)

A throttle body having an intake passage, a throttle valve rotatably provided in the intake passage, a throttle shaft that rotates the throttle valve, and a rotation lever that is provided on the throttle shaft and rotates the throttle shaft A torsion coil spring having an operating end that urges the rotating lever in the opening direction and an operating end that urges the rotary lever in the closing direction, and the two operating end portions when the throttle shaft is at the default opening. A protection member that has a stopper member for locking the urging force and a driving means for the rotating lever, and that the throttle shaft passes through the annular portion of the torsion coil spring and covers one end of the annular portion and one working end. Replace the cover on both sides of the torsion coil spring, the protective cover is characterized in that the contact pressure relieving means between the stopper member and the rotary lever Air control system.   The intake control device according to claim 1, wherein at least the operating end portion is composed of a plurality of wires forming a torsion coil spring.

Images