JPH094473A - Air flow rate control valve for automobile engine - Google Patents

Abstract

PURPOSE: To provide an air flow rate control valve for automobile engine at a low cost. CONSTITUTION: A throttle shaft 3 is supported freely to be turned so as to cross a central part of a bore 1a, which has the circular cross section, of a throttle body 1. A throttle valve 2 and a lever 4 are fixed to the throttle shaft 3. At the full closing position of the lever 4, a stopper 1d provided in the throttle body 1 as a figure (b) shows and a lever 4 abut on each other. The throttle valve 2 is formed into the circular shape, of which diameter is a little smaller than that of the bore 1a. Idle air quantity is obtained by selecting a jet 8 arranged in a bypass passage 1b of the throttle body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow control valve for an automobile engine, and more particularly to the structure of the air flow control valve.

[0002]

2. Description of the Related Art An example of a conventional air flow control valve for an automobile engine is shown in FIG. FIG. 2A is a cross-sectional view showing an example of a conventional air flow control valve for an automobile engine, and FIG. 2B is a front view showing a main part of the air flow control valve for an automobile engine. A throttle body 1 shown in the drawing is provided with a bore 1a having a circular cross section which forms an intake passage of an engine, and a throttle shaft 3 is rotatably supported by the throttle body 1 so as to cross the center of the bore 1a. .

A throttle valve 2 and a lever 4 are fixed to the throttle shaft 3. Throttle valve 2
As shown in detail in FIG. 2 (b), is θ with respect to the bore 1a.
When tilted by an angle of ₁ , the entire circumference hits the bore 1a and the bore 1a is in a fully closed state. At that time, the throttle valve 2
The periphery of the throttle valve 2 is formed so as to be inclined by an angle of θ _{1 in} the plate thickness direction so as to make surface contact with the bore 1a.

The lever 4 is connected by a wire to an accelerator pedal (not shown). The throttle shaft 3 is biased by a spring in the throttle valve closing direction. The fully closed position of the lever 4 is adjusted by the throttle adjust screw 6 which is screwed into the screw hole of the boss 1c of the throttle body 1 and abuts on the lever 4. That is, after adjusting the angle θ ₂ of the throttle valve 2 when fully closed by the throttle adjust screw 6, the lock nut 7 that is screwed with the throttle adjust screw 6 is tightened to fix the throttle adjust screw 6.

The amount of air when the throttle valve is fully closed, that is, the amount of idle air, is adjusted by a bypass adjust screw 5 arranged in the bypass passage 1b of the throttle body 1. The bypass adjust screw 5 is screwed into the screw hole of the throttle body 1, and the bypass passage 1
The clearance b is adjusted by the bypass adjust screw 5. The idle air amount is the sum of the amount of air flowing through the gap with the bore and the amount of air flowing through the bypass passage 1b when the throttle valve is fully closed.

[0006]

The above-mentioned conventional air flow control valve for an automobile engine requires thread processing for screwing the throttle adjust screw 6 on the boss 1c of the throttle body, and the number of parts such as lock nuts is also required. There are many problems, and further, there is a problem that the adjustment work is troublesome. Further, since the throttle valve is also tapered, the manufacturing cost is high.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an air flow control valve for an automobile engine in which the cost of parts and the number of assembling steps are reduced.

[0008]

An air flow control valve for an automobile engine according to the present invention has a perfect circular throttle valve fixed to a throttle shaft rotatably supported by a throttle body and fixed to the throttle shaft. The throttle valve is arranged so as to be vertical to the bore of the throttle body when the lever comes into contact with the stopper provided in the throttle body, and the jets are exchangeably arranged in the bypass passage provided in the throttle body. It is a thing.

[0009]

According to the air flow control valve for an automobile engine of the present invention, when the lever and the throttle valve are positioned and fixed to the throttle shaft, when the lever comes into contact with a stopper provided at a fixed position of the throttle body, the throttle The valve can be positioned perpendicular to the bore. At this time, the throttle valve is fully closed, but since the throttle valve is vertical to the bore,
Even if there is a variation in the angle of the throttle valve, the change in the area of the gap is small.

As described above, the air amount is stable when the throttle valve is fully closed, but the idle air amount can be set optimally by selecting the optimum jet arranged in the bypass passage. Adjustment is only required to replace the jet while measuring the amount of idle air, which requires less man-hours than the conventional one.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a sectional view showing an essential part of an air flow control valve for an automobile engine according to an embodiment of the present invention, and FIG. 1 (b) is a front view showing an essential part of the air flow control valve for an automobile engine. is there. A throttle body 1 shown in the drawing is provided with a bore 1a having a circular cross section which forms an intake passage of an engine, and a throttle shaft 3 is rotatably supported by the throttle body 1 so as to cross the center of the bore 1a. .

A throttle valve 2 and a lever 4 are fixed to the throttle shaft 3. The lever 4 is connected by a wire to an accelerator pedal (not shown). The throttle shaft 3 is biased clockwise by a spring. The fully closed position of the lever 4 is a position where the stopper 1d provided on the throttle body 1 and the lever 4 come into contact with each other as shown in FIG. At this time, the throttle valve 2 is perpendicular to the surface of the bore 1a. The throttle valve 2 has a perfect circular shape with a diameter slightly smaller than that of the bore 1a, and is made by press punching. When the throttle valve 2 and the lever 4 are fixed to the throttle shaft 3, the position of the throttle shaft in the axial rotation direction is determined.

The amount of air when the throttle valve is fully closed, that is, the amount of idle air is set by selecting the jet 8 arranged in the bypass passage 1b of the throttle body 1. The bypass passage 1b is provided with a screw hole communicating with the outside, and the jet 8 is screwed into the screw hole.
Various hole diameters are available as the jet 8,
The optimum one is selected while measuring the air volume when the throttle valve is fully closed. The screw hole for the jet 8 is the bolt 9
Closed with. The idle air amount is the sum of the amount of air flowing through the gap with the bore and the amount of air flowing through the bypass passage 1b when the throttle valve is fully closed.

[0014]

As described above, according to the air flow control valve for an automobile engine of the present invention, the throttle valve can be manufactured by press punching into a perfect circle, and further, the reduction of other parts and Manufacturing costs are significantly reduced by reducing the assembly and adjustment process.

[Brief description of drawings]

FIG. 1 (a) is a sectional view showing a main part of an air flow control valve for an automobile engine according to an embodiment of the present invention, FIG. 1 (b).
[Fig. 3] is a front view showing a main part of the air flow control valve for the automobile engine.

FIG. 2 (a) is a sectional view showing an example of a conventional automobile engine air flow control valve, and FIG. 2 (b) is a front view showing a main part of the same automobile engine air flow control valve.

[Explanation of symbols]

1 Throttle body, 1a Bore, 1b Bypass passage, 1c Boss, 1d Stopper 2 Throttle valve 3 Throttle shaft 4 Lever 5 Bypass adjust screw 6 Throttle adjust screw 7 Lock nut 8 Jet 9 Bolt

Claims (1)

[Claims] 1. A throttle valve having a perfect circular shape is fixed to a throttle shaft rotatably supported by a throttle body, and when the lever fixed to the throttle shaft comes into contact with a stopper provided on the throttle body, the throttle is provided. An air flow control valve for an automobile engine, wherein the valve is arranged so as to be perpendicular to the bore of the throttle body, and the jet is exchangeably arranged in a bypass passage provided in the throttle body.