JPH02238138A - Throttle valve driving device of internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent the accelerator depressing force from acting to a linkage, a throttle valve, and the like, when the throttle valve is fully opened, by providing a mechanism to correct the full opening position of the throttle valve in the relation with a full opening position stopper at the throttle body side, to the side of an acceleration wire drum. CONSTITUTION:The rotation force of an acceleration wire drum 14 is delivered to a throttle valve 16 in a throttle body 12 through a linkage 22, and the throttle valve 16 is driven to open or close. In this case, near a throttle arm 18 of the throttle body 12, the hook 21 of a valve shaft 17 is contacted, and a stopper 24 to determine the full opening position of the throttle valve 16 is projected. Moreover, at the pivot 15 of the drum 14, a projection 28 of the drum 14 is contacted and a mechanism 30 to regulate the full opening position of the throttle valve 16 is installed. And the mechanism 30 is composed by screwing an adjustor screw 33 locked to a holder piece 32 projecting from the fixing member 31 of the pivot 15 with a nut 34, allowing to go forward and backward freely.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a throttle valve drive device for an internal combustion engine, and more particularly to a throttle valve drive device in which an accelerator wire drum and a throttle arm are connected by a linkage.

2. Description of the Related Art As a conventional throttle valve drive device of this kind, the one shown in FIG. 5 is known, for example.
(See Publication No. 6, etc.)

Briefly, a butterfly-type throttle valve 1 is rotatably housed inside a throttle body via a valve shaft 2, and the valve shaft 2 protrudes from inside the throttle body.
A substantially V-shaped throttle arm 3 is fixed to one end of the throttle arm 3. On the other hand, a generally fan-shaped accelerator wire drum 4 is rotatably provided at a predetermined position of the engine via a pivot shaft 5.

One end 4a of the accelerator wire drum 4 and one end 3a of the throttle arm 3 are connected via a linkage 6.

Further, the throttle body is provided with a fully closed position stopper 7 that is brought into contact with a locking portion 3b provided at a side end of the throttle arm 3 to determine the fully closed position of the throttle valve 1.

This fully closed position stopper 7 is secured by an adjustment screw 8
As a result, a minute gap is formed between the outer peripheral edge of the throttle valve 1 and the inner peripheral surface of the intake passage when the throttle valve 1 is fully closed, thereby ensuring the amount of intake air during idling operation. ing. On the other hand, a fixed full-open position stopper 9 is provided on the side of the accelerator wire drum 4, with which a protrusion 4b at the side end of the accelerator wire drum 4 comes into contact to determine the fully open position of the throttle valve I. Therefore, when the vehicle suddenly accelerates, for example, when the accelerator pedal is fully depressed and the accelerator wire 10 is pulled in the direction of the arrow in the figure, the accelerator wire drum 4 rotates counterclockwise, causing the linkage 6 to move upward in the figure. At the same time, the throttle arm 3 also rotates counterclockwise, thereby opening the throttle valve 1 to its maximum extent. At this point, the protrusion 4b of the accelerator wire drum 4 hits the fixed full-open position stopper 9 and further rotation of the accelerator wire drum 4 is restricted.
Further action of the accelerator pedal force on the linkage 6, throttle valve 1, etc. is avoided.

By the way, in vehicles with automatic (A/T) specifications, the factors that determine the shift control points for upshifting and downshifting of the A/T are generally the engine rotational speed according to the crank angle and the throttle valve 1. The amount of opening is used. Then, the opening amount of the throttle valve l is set to A/T.
As a means for transmitting the information to the transmission, an A/T control linkage is engaged with the accelerator wire drum 4, and the opening degree of the throttle valve 1 is detected according to the pulling length of the accelerator wire 10.

Problems to be Solved by the Invention However, in the conventional throttle valve drive device described above, variations in the dimensions of each part of the throttle system such as the throttle valve 1 and the throttle arm 3, and the accelerator system such as the accelerator wire drum 4, etc. If a deviation occurs in the relative positions of the throttle system and the accelerator system due to variations in assembly accuracy, there is a risk that an error will occur in the operating angle of the throttle arm 3, that is, the opening angle of the throttle valve 1. Especially the fully open position stopper 9 and the protrusion 4
The contact position of b and the fully open position of the throttle valve 1 deviate from each other, and an accelerator depression force acts on the linkage 6 when the throttle valve 1 is in the fully open position. Furthermore, since the A/T shift schedule has a structure in which the reference for the shift point is determined at the fully open position, the torque characteristics of the engine tend to vary at a point close to the fully open position. As a result, problems such as a shift shock during upshifting and downshifting of the A/T become large, and the A/T hydraulic clutch becomes slippery, causing the engine to rev up during gear shifts.

Means for Solving the Problems The present invention provides, in particular, a fixed full-open position stopper on the throttle body side for determining the reference full-open position of the throttle valve, and a fixed full-open position stopper on the accelerator wire drum side in a relative relationship with the full-open position stopper. It is characterized by the provision of a fully open position adjustment mechanism that corrects the fully open position of the valve.

According to the present invention having the above-described structure, when assembling the throttle valve drive device, first, the full-open reference position of the throttle valve is set in advance by the fixed full-open position stopper. Next, while adjusting the maximum rotational position (maximum opening position) of the accelerator wire drum using the full-open position adjustment mechanism, the locking part of the throttle arm is brought into contact with the full-open position stopper, and the maximum opening position of the throttle valve is determined. do.

Here, variations in component dimensions and assembly dimensions are adjusted by the adjustment action of the fully open position adjustment mechanism. Furthermore, from here, the full-open position adjustment mechanism is finely adjusted to slightly separate the locking portion of the throttle arm from the fixed full-open position stocker. Therefore, when the accelerator wire is pulled at its maximum, a large accelerator pedal force acts on the accelerator wire drum, but
It will no longer work on linkages, etc.

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 4 shows an embodiment of the present invention applied to a four-cylinder internal combustion engine 1l. The throttle body 12 is a substantially fan-shaped accelerator wire drum rotatably mounted on the outer wall via a pivot 15, and the throttle body 12 has a butterfly-type throttle valve 16 in the chamber, as shown in FIGS. 1 and 2. is rotatably housed through a valve shaft 17, and a substantially dogleg-shaped throttle arm l8 is attached to a nut 19 at one end of the valve shaft l7.
It is fastened and fixed by. This slot. , Tor arm 1
8 is biased in the direction of fully closing the throttle valve 16 by a return spring 20 having one end 20a wound around the end of the base 18a, and one end 22a of the linkage 22 is attached to the arm tip 18b. Pivotally supported joint part 23
protrudes in the axial direction. Further, on the valve shaft l7 on the opposite side of the throttle arm 18 with the return spring 20 interposed therebetween, a substantially rectangular locking portion 21 is provided to protrude in the radial direction. Further, a fixed full-open position stopper 24 is provided protruding near the upper end of one side of the throttle arm 18 side of the throttle body 12, with which one end of the locking portion 2l comes into contact to determine the reference full-open position of the throttle valve 16. At the same time, a fully closed position stopper 25 is provided approximately at the center of one side of the throttle arm l8, with which the other end of the locking portion 21 comes into contact to determine the fully closed reference position of the throttle valve l6. This fully closed position stopper 25 includes an adjustment screw 25b that is screwed into the center of the support portion 25a and can move forward and backward, and a nut 2 that locks the adjustment screw 25b.
It is equipped with 5C.

As shown in FIGS. 1 and 3, the accelerator wire drum l4 has a wire holding portion 26 fixed to the side surface of the base portion 14a, which fixes a wire end to one end thereof, and
A joint portion 27 on which the other end portion 22b of the linkage 22 is pivotally supported is provided on one end portion 14b and protrudes in the axial direction, and a protrusion portion 28 that protrudes in parallel with the joint portion 27 is provided on the inner peripheral edge near the one end portion 14b. It is installed in one piece. Furthermore, an A/T control drum 29 is provided on the side of the accelerator wire drum 14, and is supported on the pivot shaft 15 and rotates in synchronization with the accelerator wire drum 14. Further, the protrusion 28 comes into contact with the outer end of the pivot shaft 15, and the throttle valve 16
A fully open position adjustment mechanism 30 is provided for regulating the fully open position. This fully open position adjustment mechanism 30 includes an annular fixing part 31 fixed to the pivot shaft 15 via a key member 15a,
a support piece 32 protruding from a predetermined position of the fixed portion 31 along a substantially tangential direction; an adjuster screw 33 that is threaded into a threaded portion provided at a substantially central end of the support piece 32 and moves back and forth;
A lock nut 34 is provided to lock the adjuster screw 33 in a predetermined position.

Note that the accelerator wire drum 14 is biased in the direction of fully closing the throttle valve l6 by an accelerator wire spring (not shown).

Therefore, according to this embodiment, when assembling the device, first, the fully closed reference position and the fully open reference position of the throttle valve 16 are set to the locking portion 21 of the throttle arm I8, the fully closed position stopper 25, and the fully open position stopper. The contact position with 24 is set in advance with high precision. Here, the fully closed position stopper 25 is finely adjusted to form a minute gap C between the throttle valve l6 and the intake passage 35 when the throttle valve l6 is fully closed, thereby securing the amount of intake air during idling operation. Next, the accelerator wire drum 14, A/T control drum 29, etc. are assembled to the pivot shaft 15, and both ends 22a, 22b of the linkage 22 are connected to each joint part 23, 27. At this point, there is a possibility that variations in the dimensions of each component and assembly dimensions may occur. Therefore, the accelerator wire drum 14 is rotated to the maximum in the counterclockwise direction in FIG. 1 (fully open state), and it is checked whether the side surface of the protrusion 28 and the tip 33a of the adjustment screw 33 are in contact with each other. Here, if both 28 and 332 are not in contact but separated,
In other words, in this case, the locking portion 21 and the fixed fully open position stopper 24 are in contact first, so the adjustment screw 3
3, for example, to the right while advancing, and the adjusting screw tip 33a is brought into contact with the side surface of the protrusion 28. If the adjustment screw 33 is further turned from this state to the right, for example, by about 180 degrees, the protrusion 28 will rotate slightly clockwise in the figure, and therefore the throttle arm l8 will rotate slightly clockwise via the linkage 22. The locking portion 21 and the fixed fully open position stopper 24 are separated from each other by, for example, about 0.51. For this reason, the amount of full opening of the throttle valve 16 becomes slightly smaller, but this does not affect driveability, and when the throttle valve 16 is fully opened during sudden acceleration, the protrusion 28 first touches the tip 33a of the adjustment screw 33. The locking portion 21 and the fully open position stopper 24 are prevented from coming into contact with each other. Therefore, it is possible to avoid a large accelerator depression force acting on the linkage 22 and the like.

On the other hand, if the adjustment screw tip 33a and the protrusion 28 are in contact during the contact check as described above,
It is checked whether the locking portion 21 and the fully open position stopper 24 are in contact with each other at the same time.

If both 21 and 24 are in contact with each other, tighten the adjustment screw 33 further by about 180 degrees as in the case described above.
°Turn the adjustment screw 33 to the right, but if they are not in contact, turn the adjustment screw 33 to the left and lock the locking part 21.
and the fully open position stopper 24 are brought into contact with each other. Then, from this state, if the adjustment screw 33 is rotated, for example, 180 degrees to the right in the same manner as described above, it is possible to prevent the locking portion 2l from coming into contact with the fully open position stopper 24, thereby reducing the accelerator pedal force on the linkage 22, etc. It can definitely be avoided.

It goes without saying that after the position adjustment using the adjustment screw 33, the rotation is locked using the nut 34.

The present invention is not limited to the above embodiments.

Effects of the Invention As is clear from the above description, according to the present invention, a full-open position adjustment mechanism is provided on the accelerator wire drum side, which corrects the full-open position of the throttle valve in relation to the full-open position stopper on the throttle body side. This not only reliably prevents the effect of accelerator pedal force on the linkage, throttle valve, etc. when the throttle valve is fully opened, but also prevents variations in the opening amount of the throttle valve due to variations in the dimensions and assembly dimensions of each part. It can be adjusted with good precision. As a result, the A/T shift schedule is appropriately set according to the torque characteristics of the engine, the shift shock is sufficiently alleviated, and the engine is prevented from revving up during the shift.

[Brief explanation of drawings]

Fig. 1 is a main part configuration diagram showing one embodiment of the present invention, Fig. 2 is a view taken in the direction of arrow A in Fig. 1, Fig. 3 is a view taken in the direction of arrow B in Fig. 1, and Fig. 4 is a view of this embodiment. FIG. 5 is a partial perspective view of an internal combustion engine to which this is applied, and FIG. 5 is a schematic diagram showing a conventional throttle valve drive device. 12... Throttle body, 14... Accelerator wire drum, 16... Throttle valve, 22... Linkage, 2
4...Fixed full-open position stopper, 30-...Full-open position adjustment mechanism. Figure 1 Figure 1 Figure

Claims (1)

[Claims] (1) In a throttle valve drive device that transmits the rotational force of an accelerator wire drum to a throttle valve in a throttle body via a linkage, a fixed full-open position that determines a reference full-open position of the throttle valve is placed on the throttle body side. A throttle valve drive device for an internal combustion engine, characterized in that a stopper is provided, and a full-open position adjustment mechanism is provided on the accelerator wire drum side for correcting the full-open position of the throttle valve in relation to the full-open position stopper.