JPH0426658Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to an intake system for an engine in which an intake passage is provided with a control valve for regulating the flow of intake air.

(Prior art) Conventionally, two intake passages were provided to forcibly generate swirl in the intake air-fuel mixture during partial load operation, and a control valve was provided in each intake passage to regulate the flow of intake air. There is an engine intake system (Japanese Unexamined Patent Publication No. 148714/1983).

In this conventional device, the adjustment screw member for adjusting the opening degree of the control valve described above is provided at a part outside the intake manifold where adjustment is easy for the sake of operability.

For this reason, there has been a problem in that the above-mentioned adjustment screw member, which is finely adjusted to maintain an appropriate opening degree at the manufacturing stage, is erroneously adjusted by the user, causing the opening degree of the control valve to deviate from the appropriate value.

(Purpose of the invention) The object of the invention is to provide an engine intake device that can prevent a user from erroneously adjusting an adjusting screw member.

(Structure of the device) This device has an adjustment screw member that adjusts the opening degree of the control valve near the cylinder head mating surface of the intake manifold, and the cylinder head is located on the extension of the axis of the adjustment screw member on the operating section side. The invention is characterized in that it is an intake device for an engine that is provided to do so.

(Effects of the invention) According to this invention, since the cylinder head is located on the operating part side of the adjusting screw member, it can be connected to the cylinder head of the intake manifold, which has the adjusting screw member adjusted in advance to maintain the proper opening. After being assembled in the manufacturing stage, it is difficult to adjust the above-mentioned adjusting screw member, and this has the effect of preventing the user from erroneously adjusting the adjusting screw member.

(Example) An example of this invention will be described in detail below based on the drawings.

The drawings show an intake system for an engine, and in FIGS. 1, 2, and 3, an intake valve 3 is disposed at each intake port 2... of a cylinder head 1, and each of the above-mentioned intake ports 2... An intake manifold 4 is provided which is connected in communication with the intake manifold 4.

The intake manifold 4 is a manifold having two branch parts 5, 5 for one cylinder, and an intake passage 6 is provided in each branch part 5.

The above-mentioned intake passage 6 is composed of a main intake passage 6a and a sub-intake passage 6b, and the main intake passage 6a has an intake control valve 7 that regulates the flow of intake air during low-load operation.
has been set up.

The even-numbered intake control valves 7 mentioned above have a single valve shaft 8.
One end of the valve shaft 8 protrudes outside the intake manifold 4, and a lever fitting portion 9 is integrally formed on this protrusion.

Then, the center part of the lever 10 is fitted into this lever fitting part 9, and a connecting pin 11 is provided protruding from one free end of this lever 10, and this pin 11 and actuator 12 are connected with a rod 13. are interconnected.

Further, the other free end of the lever 10 described above is bent into an L-shape to form an abutting part 14, and when the actuator 12 is actuated, the abutting part 14 is moved to the non-operating end of the adjusting screw member 15, which will be described later. The valve shaft 8 is brought into contact with the valve shaft 8 to regulate the rotational position of the valve shaft 8, that is, the opening degree of the control valve 7.

The above-mentioned adjustment screw member 15 is, for example, a member constructed by an adjusting screw, and this adjustment screw member 15 is located near the cylinder head mating surface 4a of the intake manifold 4
The above-mentioned cylinder head 1 is disposed so that the side end surface of the cylinder head 1 is located on the axial extension of the head side, which is the operating section of the cylinder head 5.

Adjustment screw member 1 on the side end surface of this cylinder head 1
5, the unnecessary flesh is scraped off to form a concave area 1a, and this area 1
The head of the adjusting screw member 15 is located within the space a.

In addition, the carburetor 1 equipped with throttle valves 16, 16 is provided at the front of the intake manifold 4.
7 are connected in series.

In the engine intake system configured as described above, since the above-mentioned adjusting screw member 15 is provided near the cylinder head mating surface 4a of the intake manifold 4, which has a high processing accuracy, special machining is not required when installing the adjusting screw member 15. Therefore, the above-mentioned adjustment screw member 15 can be attached using the vicinity of the highly accurate cylinder head mating surface 4a as it is.

As a result, there is an effect that the conventional machining for attaching the adjustment screw member can be omitted.

In addition, since the cylinder head 1 is located on the operation part side of the adjusting screw member 15, that is, on the head side of the adjusting screw, the adjusting screw member 15 may be accidentally pulled during other work such as engine assembly or by a user. Therefore, the opening degree of the intake control valve 7, which has been set and regulated to an appropriate opening degree by the adjusting screw member 15, will not deviate from the appropriate value.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; FIG. 1 is a partially sectional plan view showing an engine intake system, FIG. 2 is a side view of the main part of FIG. 1, and FIG. 3 is an explanatory diagram of the intake system. It is. DESCRIPTION OF SYMBOLS 1... Cylinder head, 4... Intake manifold, 4a... Cylinder head mating surface, 6... Intake passage, 7... Control valve, 15... Adjustment screw member.

Claims (1)

[Scope of Claim for Utility Model Registration] An intake system for an engine having a control valve for regulating the flow of intake air in the intake passage, wherein an adjusting screw member for adjusting the opening degree of the control valve is connected to the cylinder head mating surface of the intake manifold. In the vicinity,
and an intake device for an engine, wherein the cylinder head is located on an extension of the axis of the adjusting screw member on the operating section side.