JPS61256067A - Throttle valve assembly - Google Patents

Abstract

PURPOSE:To keep a throttle valve shaft from being subjected to moment of rotation by providing a partition wall disposed adjacent to a throttle valve shaft and along the throttle valve shaft, which is extended to the inlet side. CONSTITUTION:A throttle valve shaft 14 is pierced through a fluid passage 12 formed on a main body 10 substantially in direction of crossing the central axis. A circular valve plate 16 is fixed to a throttle valve shaft 14, with one end surface of the disc plate 16 confronting with the inlet side 18, and with the other end surface thereof confronting with the outlet side 20. A partition wall 22 is disposed substantially just above the throttle valve shaft 14 in such a manner as to divide a fluid passage 12 along the throttle valve shaft 14. In this arrangement, deflecting flow of a fluid is reduced at the boundary of the throttle valve shaft 14, so that the throttle valve shaft is kept from being subjected to the moment of rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a throttle valve assembly for controlling the amount of fluid and an automatic fluid volume adjustment device using this throttle valve assembly.

[Background of the invention]

In general, throttle valve assemblies used, for example, in fuel injection devices for internal combustion engines are disclosed in Japanese Patent Laid-Open No. 55-164775 and Japanese Patent Laid-open No. 55-16477.
As seen in Publication No. 9-162361, a valve plate is fixed to the throttle valve shaft that crosses the center line of the intake passage, and the amount of fluid (in this case, the amount of air) is controlled by changing the opening degree of the valve plate. .

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

Therefore, there is a problem in that the operating force varies when controlling the fluid amount.

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

[Purpose of the invention]

An object of the present invention is to suppress the rotational moment applied to the throttle valve shaft.

[Summary of the invention]

A feature of the present invention is that the partition wall is disposed close to the throttle valve shaft and extends along the throttle valve shaft along the inlet side.

According to such a configuration, it is possible to suppress the rotational moment from being applied to the throttle valve shaft, which reduces the uneven flow of fluid with the throttle valve shaft as a boundary.

[Embodiments of the invention]

An embodiment of the present invention will be described in detail below.

In FIG. 1, a throttle valve shaft 14 passes through the main body 10 in a direction substantially transverse to the central axis of the secondary fluid passage 12. As shown in FIG.

A circular valve plate 16 is fixed to the throttle valve shaft 14, and one end face of the valve plate 16 faces the inlet side 1B, and the other end face faces the outlet side 20.

The above is the structure of the well-known throttle valve assembly, but in the embodiment of the present invention, the four throttle valve shafts 1
A partition wall 22 is arranged to divide the fluid passage 12 along the line 4.

This partition wall 22 extends towards the inlet side 18 of the fluid passage 12 .

In the above configuration, when fluid flows through the fluid passage 12, the fluid is divided by the partition wall 22 and flows through the throttle valve 1.
6 and the wall surface forming the fluid passage 12, the liquid is metered and sent to the outlet side 20.

In this embodiment, the partition wall 22 extends from almost directly above the throttle valve shaft 14 toward the population side 18, so that the uneven flow of fluid is reduced with the throttle valve shaft 14 as a boundary. This can prevent the throttle valve shaft from receiving rotational moment.

The above is the basic explanation, but other characteristic points will be explained.

First, the partition wall 22 is manufactured integrally with the main body 1O by die casting, thereby preventing the partition wall 22 from falling off.

Next, the contact portion between the partition wall 22 and the throttle valve shaft 14 is formed at the same time as the step of forming the shaft support hole for receiving the throttle valve shaft 14 in the main body 10. Therefore, there is a small gap at the contact portion between the partition wall 22 and the throttle valve shaft 14, and leakage of fluid is reduced.

Furthermore, the partition wall 22 is slightly offset from the axis of the throttle valve shaft 14. That is, the purpose is to make the throttle valve 16 substantially parallel to the fluid flow so that the throttle valve 16 does not act as a resistance to the fluid when the throttle valve 16 is fully opened. For this reason, in the embodiment, the partition wall 20 is shifted toward the side where the throttle valve 16 rotates in a direction closer to the outlet side 20.

In some cases, the partition wall 22 may be configured separately from the main body 10 and integrated into one assembly. The reason for this is that the partition walls are made of a different material.

The throttle valve shaft assembly has been described above, and next, one embodiment of an automatic fluid volume adjustment device using this throttle valve assembly will be described.

The automatic fluid amount adjustment device shown in FIG. 3 is one that adjusts the amount of air sent to, for example, an internal combustion engine.

An electric actuator 24 (for example, a pulse motor, a DC motor, an I! magnet, etc.) that rotates the throttle valve shaft 14 is engaged with one end of the throttle valve shaft 14, and an angle sensor 24 is engaged with the other end of the throttle valve shaft 14.
6 is provided, and a drive signal from a control device fif 28 is sent to this electric actuator 24.

Therefore, for example, in internal combustion engines, the actual engine speed
Compare the number with the target engine speed.

A drive signal based on this comparison result is sent to the electric actuator 24 to control the idle rotation speed.Next, a drive signal corresponding to a predetermined amount of air is sent to the electric actuator 24, and this result is sent to the angle sensor 26. A method for detecting and correcting and controlling the drive signal has been implemented.

However, when using a conventional throttle valve assembly, rotational moment due to air flow acts on the throttle valve shaft 14, making it difficult to obtain the opening degree of the throttle valve shaft 14 in response to the drive signal. There's a problem.

On the other hand, when the throttle valve assembly as in this embodiment is used, the influence of rotational moment due to air flow on the throttle valve shaft 14 is small, and the opening degree of the hole throttle valve shaft 14 can be easily obtained in response to the drive signal. This makes it possible to improve the responsiveness of air volume control.

Note that the throttle valve shaft 14 is not limited to an electric actuator, and the same applies to those using a fluid actuator such as hydraulic pressure or negative pressure.

〔Effect of the invention〕

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

[Brief explanation of the drawing]

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 the automatic fluid amount adjustment device. 10... Main body, 12... Fluid passage, 14... Throttle valve shaft, Fig. 2, Fig. 30

Claims (1)

[Scope of Claims] 1. (a) A fluid passage formed in the main body; (b) A throttle valve shaft extending substantially across the central axis of the fluid passage; (c) A throttle shaft fixed to the throttle valve shaft; a plate-shaped valve plate with an end face facing the inlet side of the fluid passage and the other end face facing the outlet side of the fluid passage; (d) disposed close to the throttle valve axis and dividing the fluid passage; and a partition wall extending toward the inlet side of the fluid passage. 2. The throttle valve assembly according to claim 1, wherein the partition wall is integrally formed with the main body by die casting. 3. The throttle valve assembly according to claim 1, wherein the partition wall is formed separately from the main body and is integrated in an assembly process. 4. The throttle valve assembly according to claim 1, wherein the partition wall is shifted in a direction in which the valve plate approaches the outlet side of the fluid passage, dividing the fluid passage into equal parts. 5. The throttle valve assembly according to claim 1, wherein the throttle valve shaft is driven by an actuator.