JP2531881Y2 - Throttle valve for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a throttle valve for an internal combustion engine.

<Prior Art> The passage area is variable by being interposed in an intake passage of an internal combustion engine,
As a butterfly type throttle valve for controlling the intake air amount, for example, there is one shown in FIG.
-95147, etc.).

In the figure, a throttle valve 1 has a rotational axis 3 that is the diameter direction of a cylindrical intake passage (throttle chamber) 2.
It is rotatably supported, and is provided so as to be fully closed at a position inclined at a predetermined angle with respect to a plane orthogonal to the axis of the intake passage 2.

<Problem to be solved by the invention> By the way, when the engine is idling, the throttle valve 1
Is set at a position that is opened by a small angle with respect to the fully closed state to set the air flow rate during idling.

In such a configuration, it is necessary to reduce the opening degree of the throttle valve 1 to reduce the flow rate of air leaking from the gap between the peripheral edge of the throttle valve 1 and the intake passage 2 in order to reduce the idle speed.

However, when the opening of the throttle valve 1 is reduced,
As shown in FIG. 5, when the intake negative pressure of the engine causes a deflection in the upstream portion of the portion divided into the upstream side and the downstream side of the intake with respect to the rotary shaft 3 of the throttle valve 1, This causes a problem that the peripheral portion of the throttle valve 1 bites into the inner peripheral surface of the intake passage 2.

As a result, there is a limit in reducing the flow rate of the leaked air, and there has been a problem that the above-described demand for reducing the idle speed cannot be sufficiently satisfied.

It is conceivable that the thickness of the throttle valve 1 is increased to increase its strength so that the above-described bending does not occur. However, this does not seem to increase the manufacturing cost of the throttle valve 1.

Therefore, the present invention has been made in view of the above-mentioned conventional problems,
An object of the present invention is to provide a throttle valve for an internal combustion engine that has improved the structure of a throttle valve, has enabled a reduction in the amount of leaked air for the purpose of reducing the idle speed, and has enabled a reduction in manufacturing cost. And

<Means for Solving the Problems> Therefore, the throttle valve of the internal combustion engine of the present invention is
A throttle valve rotatably supported around a diameter direction of an intake passage of an internal combustion engine as a rotation axis, and provided in a fully closed state at a position inclined at a predetermined angle with respect to a plane perpendicular to the axis of the intake passage. A reinforcing rib that is convex on one of the upstream surface and the downstream surface and formed concave on the other is formed on the upstream part of the part divided into the upstream side and the downstream side of the intake with respect to the rotation axis. Configuration.

<Operation> In this configuration, it is possible to prevent bending of the intake air upstream of the throttle valve as a boundary due to the suction negative pressure of the engine.

Therefore, the disadvantage that the peripheral portion of the throttle valve bites into the inner peripheral surface of the intake passage is prevented.

As a result, there is no problem in reducing the opening degree of the throttle valve and reducing the flow rate of the leaked air from the gap between the peripheral edge of the throttle valve and the intake passage, and it is possible to sufficiently answer the demand for reducing the idle speed. It becomes possible.

Also, as a result of forming the reinforcing rib so that it is convex on one of the upstream surface and the downstream surface and concave on the other, the rib serves as a mark for discrimination between the front and back of the throttle valve, and the work of mounting the throttle valve is difficult. This makes it easier to eliminate the conventional front and rear discrimination marks.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2, the throttle valve 1 is rotatably supported with a diametrical direction of an intake passage of an internal combustion engine as a rotation axis 3, and is fully tilted at a predetermined angle with respect to a plane perpendicular to the axis of the intake passage. The configuration provided so as to be in the closed state is the same as the conventional one.

Reinforcing ribs 4 are formed in an upstream portion 1A of the portions divided into the upstream side and the downstream side of the intake with respect to the rotation shaft 3 of the throttle valve 1.

The rib 4 is located on the upstream side 1A of the throttle valve 1.
Are formed integrally with each other so as to protrude on the upstream surface of the upstream portion 1A and to be concave on the downstream surface, for example, by press working.

As a result of providing the reinforcing ribs 4 as described above, the following operations and effects are obtained.

That is, it is possible to prevent the upstream portion 1A of the intake air from being bent by the negative pressure of the engine with respect to the rotation shaft 3 of the throttle valve 1 as much as possible. It is possible to prevent the problem of biting into the vehicle.

As a result, there is no problem in reducing the opening degree of the throttle valve 1 to reduce the flow rate of air leaking from the gap between the peripheral edge of the throttle valve 1 and the intake passage, and sufficiently answers the demand for reducing the idle speed. It becomes possible.

Further, since the thickness of the throttle valve 1 can be reduced, the manufacturing cost of the throttle valve 1 can be reduced.

FIG. 3 is a table showing the relationship between the suction negative pressure acting on the throttle valve 1 and the amount of deflection of the throttle valve 1, and it is clear that the present invention can reduce the amount of deflection as compared with the prior art.

In the above-described embodiment, the reinforcing ribs 4 are integrally formed by pressing so as to be convex on the upstream surface and concave on the downstream surface, but are formed at the time of forming the throttle valve 1 itself. Alternatively, it may be formed so as to be concave on the upstream surface and convex on the downstream surface, and the shape, number, etc. are arbitrary.

Particularly, as described above, the reinforcing ribs 4 are formed so as to be convex on one of the upstream surface and the downstream surface and concave on the other. Therefore, the work of attaching the throttle valve 1 is facilitated, and the conventionally provided discrimination marks on the front and back can be eliminated.

<Effects of the Invention> As described above, according to the throttle valve of the internal combustion engine of the present invention, reinforcement for the upstream portion of the portion divided into the upstream side and the downstream side of the intake with respect to the rotary shaft is provided. Because of the ribs formed, the deflection due to the suction negative pressure of the throttle valve is reduced, the leakage air flow is reduced, the idle speed is reduced,
In order to reduce manufacturing cost, etc., in particular, as a result of forming a reinforcing rib so that it is convex on one of the upstream surface and the downstream surface and concave on the other, this rib is a mark for discrimination of the front and back of the throttle valve. In addition, the mounting work of the throttle valve is facilitated, and the conventionally provided discrimination marks on the front and back sides can be eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the throttle valve according to the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a graph showing the effect of the embodiment, FIG. FIG. 1 is a sectional view showing the configuration of a conventional throttle valve, and FIG. 1 ... throttle valve, 1A ... upstream part 3 ... rotating shaft, 4 ... rib

Claims (1)

(57) [Scope of request for utility model registration] An internal combustion engine is supported so as to be rotatable about a diameter direction of an intake passage as a rotation axis, and is provided so as to be fully closed at a position inclined at a predetermined angle with respect to a plane perpendicular to the axis of the intake passage. Reinforcing the throttle valve, wherein the upstream portion and the downstream surface of the portion divided into the upstream side and the downstream side of the intake with respect to the rotation axis are convex on one of the upstream surface and the downstream surface and concave on the other. A throttle valve for an internal combustion engine, wherein a rib for use is formed.