JPS608433A - Return mechanism of throttle valve for engine suction volume control - Google Patents

Abstract

PURPOSE:To generate a fixed operational torque in the whole opening degrees of a throttle valve by combining a valve stem of a suction throttle valve with a rotating body via a torsion spring and the rotational body with a trunk via a tension spring. CONSTITUTION:A throttle valve stem 3 is supported to be fitted on a trunk 2 across a suction passage 1 and a sleeve 7 with a disk type rotating body 6 is fitted to be rotated at one end part of the valve stem 3, while at the same time, a throttle arm 8 is fixed. One end 9a of a torsion spring 9 provided on a periphery of the sleeve 7 is hooked on a projection 8a of the throttle arm 8, while the other end 9b on a projection 6a of the rotating body 6. Also, one end 10a of a tension spring 10 provided along the outside face of the trunk 2 is engaged with a pin 2a of the trunk 2, while the other end 10b is engaged with the rotational body 6 to rotate the throttle valve 4 in a direction of closing the valve by the two springs 9 and 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for returning nine throttle valves, which are rotatably installed across an intake path l and controls the intake air amount of an engine, to a closed position.

A return spring is provided which pivots the lock throttle valve toward a closed position upon release or release of the accelerator pedal or lever. This return spring is a tension spring or torsion spring that is engaged at one end of the throttle valve stem and fixed to the body at the other end, but there are dimensional restrictions depending on the installation location, and Because the spring deforms depending on the opening of the fj square, it is difficult in design and manufacturing to generate a stable operating torque even though the stress fluctuates greatly, so it is difficult to fully open the throttle valve. It has not been possible to use a spring that can generate a predetermined operating torque over the full opening range from fully closed to fully closed as the return spring.

The purpose of the present invention is to solve these problems and provide a return mechanism that can generate stable operating torque over the full opening range of the throttle box using a spring with a small spring constant. be.

That is, in order to achieve this object, the present invention provides a return mechanism for a throttle valve for engine intake air amount control.

A rotating body is rotatably supported on the throttle valve shaft of a throttle valve that is rotatably installed across the intake passage.

The present invention is characterized in that two ends of the torsion spring are connected to the throttle valve shaft and the rotating body, and two ends of the tension spring are connected to the body and the rotating body. A specific example of this will be explained based on the drawings. A throttle valve shaft 3 is rotatably supported in a body 2 across an intake passage l that supplies air to an engine equipped with a fuel supply means using a carburetor type or a fuel injection type. The disk-shaped throttle valve 4 fixed to the throttle valve shaft 3 can be rotated by operating an accelerator pedal or lever (not shown) connected to a link 5 attached to one shaft end of the throttle valve shaft 3. Intake path]
The effective area of the engine is changed from the minimum to the maximum to control the intake air 1 of the engine.

A sleeve 7 containing a disc-shaped rotating body 6 is fitted to the other shaft end of the throttle valve shaft 3 so as to freely rotate, and a throttle arm 8 is fixedly attached.

One end 9a of a coiled torsion spring 9 loosely wound on the outer circumferential surface of the sleeve 7 is coupled to the throttle shaft 3 by engaging with the protrusion 8a of the throttle arm 8. The end portion 9b of the rotor 6 is engaged with and coupled to the protrusion 6a of the rotating body 6. Also, the end of the coiled tension spring 10 disposed along the outer surface of the body 2 ] Oa
The bottle 2a protrudes from the body 2 [is connected to the rod body 2 by engagement, and the other end 10h is connected to the rotating body 69. These two springs 9, 10
is moving so as to rotate the throttle valve 4 in the valve closing direction.

As can be seen from this example, the torsion spring 9, tension spring 10, and t are used in combination and are installed in series between the body 2 and the throttle valve shaft 3 via the rotating body 6 to generate the operating torque in the valve closing direction. According to the configuration of the present invention given to the throttle valve 4, when the throttle valve 4 opens, the screw collar spring 9 is tightened and the tension spring 10 is expanded, and when the throttle valve 4 closes, these two springs 9. ]O
each returns to its initial position where the spring load is minimum. Therefore, for example, when M9 4 is fully open to half open, the valve is closed by the contraction force of 0. From half open to fully closed, the valve is closed mainly by the unwinding force of the screw spring 9, and the operating torque is like a stone. Not only can it be generated in one minute, but also two springs9. ] By selecting the spring constant of 0 as appropriate, the operating torque can be set arbitrarily, and by using a spring with a small spring constant, a nearly constant operating torque can be stabilized over the entire opening range of the throttle valve 4. This often occurs, making it possible to apply a substantially constant valve closing force to the throttle valve 4. Furthermore, since the position where the tension spring 10 is coupled to the partially rotating body 6 can be freely selected, the operating torque can be effectively applied to the diaphragm 4 even if the installation location is limited.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a specific example of the present invention. FIG. 2 is a side view thereof. 1... Intake path, 2... Body, 3...
... Throttle axis, 4... Throttle valve, 6...
・Rotating body, 8... Aperture arm, 9...
Torsion springs, 9a, 9b...ends, 10...
...Tension spring, 10a, ]Oh... End.

Claims (1)

[Claims] A rotating body is rotatably supported on a throttle valve shaft of a throttle valve rotatably installed across the intake passage, and two ends of a torsion spring are coupled to the throttle valve shaft and the rotating body, A return mechanism for a throttle valve for engine intake air amount control, characterized in that two ends of a tension spring are connected to a body and the rotating body.