JPH081265B2 - Throttle assembly - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve assembly for controlling the amount of fluid and an automatic fluid amount adjusting device using the throttle valve assembly.

[Background of the Invention]

Generally, for example, a throttle valve assembly used in a fuel injection device for an internal combustion engine is disclosed in JP-A-55-164775 and JP-A-59-1623.
As disclosed in Japanese Patent Laid-Open No. 61-61, the amount of fluid (here, amount of air) is controlled by fixing a valve plate to a throttle shaft that crosses the center line of the intake passage and changing its opening.

However, in such a throttle valve assembly, a rotational moment is generated on the throttle valve shaft due to the flow of fluid, and this rotational moment changes as a function of the fluid amount, the opening angle and the like.

Therefore, there is a problem that the operating force fluctuates when controlling the amount of fluid.

For example, when the throttle valve shaft is operated by an electrical actuator or a fluid actuator, there is a problem that the throttle valve shaft does not stop at an accurate position corresponding to the control signal.

[Object of the Invention]

An object of the present invention is to prevent the throttle shaft from receiving a rotational moment.

[Outline of Invention]

The feature of the present invention resides in that the partition wall arranged close to the throttle valve shaft and extending along the throttle valve shaft extends toward the inlet side.

According to such a configuration, the unbalanced flow of the fluid is reduced at the border of the throttle valve, so that it is possible to prevent the throttle valve shaft from receiving a rotational moment.

Example of Invention

 Hereinafter, one embodiment of the present invention will be described in detail.

In FIG. 1, a throttle valve shaft 14 is penetrated in a direction crossing a substantially central axis of a fluid passage 12 formed in a main body 10.

A circular valve plate 16 is fixed to the throttle valve shaft 14. One end surface of the valve plate 16 faces the inlet side 18 and the other end surface faces the outlet side 20.

The above is the structure of the well-known throttle valve assembly. However, in the embodiment of the present invention, the throttle valve shaft 14 is provided almost directly above the throttle valve shaft 14.
A partition wall 22 is arranged so as to divide the fluid passage 12 along the partition wall.

The partition wall 22 extends toward the inlet side 18 of the fluid passage 12.

In the above configuration, when the fluid now flows through the fluid passage 12, the fluid is divided by the partition wall 22 and flows, and is measured in the gap formed between the throttle valve 16 and the wall surface forming the fluid passage 12. And sent to the exit side 20.

Further, in this embodiment, the partition wall 22 extends from almost directly above the throttle valve shaft 14 toward the inlet side 18, so that the throttle valve shaft
The uneven flow of the fluid is reduced at the boundary of 14, and as a result, the throttle valve shaft can be prevented from receiving a rotational moment.

The above is a basic description, but the other characteristic points will be described.

First, the partition wall 22 is manufactured by die cast integrally with the main body 10 to prevent the partition wall 22 from falling off.

Next, regarding the contact portion between the partition wall 22 and the throttle valve shaft 14, this portion is formed at the same time in the step of forming a shaft support hole for receiving the throttle valve shaft 14 in the main body 10. Therefore, the contact portion between the partition wall 22 and the throttle valve shaft 14 becomes a minute gap to reduce fluid leakage.

Further, the partition wall 22 is slightly deviated from the axis of the throttle shaft 14. That is, the throttle valve 16 is made substantially parallel to the flow of the fluid so that the throttle valve 16 does not become a resistance of the fluid when the throttle valve 16 is fully opened. Therefore, in the embodiment, the partition wall 20 is offset to the side where the throttle valve 16 rotates in the direction approaching the outlet side 20.

In some cases, the partition wall 22 may be configured separately from the main body 10 and may be integrated by assembly. The reason is that the partition wall may be made of another material.

Although the throttle valve shaft assembly has been described above, an embodiment of an automatic fluid amount adjusting device using this throttle valve assembly will be described.

The automatic fluid amount adjusting device shown in FIG. 3 shows, for example, a device for adjusting the amount of air sent to an internal combustion engine.

An electric actuator 24 (for example, a pulse motor, a DC motor, an electromagnet, etc.) for rotating the throttle valve shaft 14 is engaged with one end of the throttle valve shaft 14, and an angle sensor 26 is provided at the other end thereof. A drive signal from a control device 28 is sent to the physical actuator 24.

Therefore, for example, in an internal combustion engine, the actual engine speed is compared with the target engine speed, and a drive signal based on this comparison result is sent to the electric actuator 24 to control the idle speed, and also. For example, a drive signal corresponding to a predetermined air amount is sent to the electric actuator 24, the result is detected by the angle sensor 26, and the drive signal is corrected and controlled.

However, with the conventional throttle valve assembly, there is a problem that the rotation moment due to the flow of air acts on the throttle valve shaft 14, making it difficult to obtain the opening degree of the throttle valve shaft 14 corresponding to the drive signal. is there.

On the other hand, when the throttle valve assembly as in this embodiment is used, the influence of the rotation moment due to the air flow on the throttle valve shaft 14 is reduced, and the opening degree of the throttle valve shaft 14 corresponding to the drive signal is easily obtained. The control response of the air amount can be improved.

The throttle valve shaft 14 is not limited to an electric actuator, and the same thing can be said when a hydraulic actuator such as hydraulic pressure or negative pressure is used.

〔The invention's effect〕

As described above, according to the present invention, it is possible to suppress the rotational moment from acting on the throttle shaft, and as a result, it is possible to eliminate the problem of fluctuations in operating force.

[Brief description of drawings]

FIG. 1 is a sectional view of a throttle valve assembly according to an embodiment of the present invention,
FIG. 2 is a top view of FIG. 1, and FIG. 3 is a configuration diagram of an automatic fluid amount adjusting device. 10 ... Main body, 12 ... Fluid passage, 14 ... Throttle valve shaft, 16 ... Valve plate, 18 ...
Entrance side, 22 ... Partition wall.

Claims (1)

[Claims] 1. A fluid passage formed in a main body; (b) A throttle valve shaft extending substantially across a central axis of the fluid passage; (c) An end face fixed to the throttle valve shaft. A plate-like valve plate facing the inlet side of the fluid passageway and the other end surface facing the outlet side of the fluid passageway; (d) The valve plate is disposed closely along the throttle valve shaft, and the valve plate is the outlet side of the fluid passageway. A partition wall extending toward the inlet side of the fluid passage so as to be unevenly divided into the direction toward the side.