JPS5840295Y2 - Ninenenkikanyoukikasokushinouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake manifold for a multi-cylinder internal combustion engine, and more particularly to a fuel vaporization promoting device for promoting vaporization of fuel.

Conventionally, in order to promote fuel vaporization, a guide knob was installed in the intake manifold at the lower end of the carburetor to guide the mixed gas from the carburetor near the riser surface 1.

The flange of this guide pipe was suspended between the carburetor and the heat insulator attached to the intake manifold.

Therefore, it was necessary to newly process the heat insulator to receive the flange portion.

In the old days, the mixed gas guided by the guide pipe quickly spread inside the intake manifold, and it was not sufficiently vaporized and heated by the riser surface, resulting in poor distribution of the mixed gas to each cylinder.In other words, the uniformity of the air-fuel ratio was poor. .

The purpose of the present invention is to be able to apply this method to a conventional intake manifold without the need for special processing of the heat insulator, and to ensure sufficient vaporization heating of the mixed gas and the distribution of the mixed gas to each cylinder. - To provide a vaporization accelerator for a multi-cylinder internal combustion engine that makes the air-fuel ratio uniform.

According to the present invention, the above object is achieved as follows.

Attach a guide member to the riser side end of the guide pipe installed in the intake manifold following the carburetor.

The guide member is installed so that at least the portion facing the guide member is substantially parallel to the riser surface, which is planar, and separated by a certain distance.

As a result, the mixed gas from the carburetor passes through that space at high speed, ensuring sufficient vaporization and heating, thereby significantly improving the distribution state and air-fuel ratio to each cylinder.

By bending the side surface of the plate parallel to the riser surface of the guide member to form legs and thereby supporting the guide pipe, it can be installed in a conventional intake manifold without processing the heat insulator.

Other objects and effects of the present invention will be apparent from the following embodiments of the present invention, which will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front sectional view showing an embodiment of the vaporization accelerator for a multi-cylinder internal combustion engine according to the present invention, and FIG. 2 is a side sectional view of the vicinity of the guide member as seen from line 2--2 in FIG.

As shown in FIG. 1 VC, when the piston 12 is pushed down near the dead center during the explosion stroke, the exhaust valve 14
When the piston 12 opens and the piston 12 rises again, the hot exhaust gas passes through the exhaust port 16 into the exhaust manifold 18, heats the riser surface 20, and is discharged to the outside.

Intake manifold 26 by heat insulator 22
The mixed gas created by the insulated carburetor 24 enters the intake manifold 26 and from there to the intake port 2.
8 and is drawn into the cylinder interior 32 when the intake valve 30 is engaged.

The mixed gas is delivered near the riser surface 20 by the guide pipe 34.
The flow rate is increased by the guide member 36 according to the present invention and the planar portion of the riser surface 20 sealing at least the member, so that the flow is sufficiently vaporized by the riser surface 20 and spreads inside the intake manifold 26.

This guide member may be, for example, a metal plate welded or integrally formed on the riser surface side end of the guide pipe 34 located near the riser surface 20 at the point 1 where the maximum intake air amount does not change.

The guide member 36 has legs 38, for example, made by bending the sides of a plate parallel to the riser surface 20 (FIG. 2).

As a result, the guide pipe 34 and the plate-shaped guide member 36 can be maintained at a constant distance from the upper edge of the riser surface 20 without applying any special processing to the heat insulator 22, that is, the maximum intake air amount at the maximum output of the engine can be maintained. It is maintained at a distance that does not change.

This is because if the cross-sectional area of the passage formed by the guide member 36, the legs 38, and the riser surface is too narrow, it will create resistance to the flow of the suction air, and as the air inflow speed increases, the resistance will increase, so the amount of suction air will decrease. This is because there is a possibility that the suction amount decreases significantly at the time of the maximum output.

Therefore, it is necessary to set a passage cross-sectional area that promotes vaporization of the air-fuel mixture to such an extent that the maximum intake air amount does not change. It is essential to determine the setting, that is, the passage cross-sectional area as described above.

Due to the presence of the guide member 36, the flow velocity of the mixed gas hitting the riser surface 20 can be increased without changing the intake manifold 26, so the mixed gas is sufficiently vaporized and the mixed gas distribution to each cylinder and the air-fuel ratio are significantly improved. At the same time, warm-up performance during cold conditions has improved.

An example of the extent to which the air-fuel ratio of the mixed gas distributed to each cylinder has been improved by the present invention is shown in Fig. 3 using actually measured data.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the vaporization accelerator for a multi-cylinder internal combustion engine according to the present invention, Fig. 2 is a side sectional view showing the vicinity of the guide member as seen from line 2-2 in Fig. 1, and Fig. 3 It is a graph showing the air-fuel ratio of cylinders. 24...Carburetor, 26...Intake manifold, 20...Riser surface, 34...Guide pipe, 36
...Guidance member.

Claims (1)

[Scope of utility model registration request] The planar riser surface 20 is combined with a carburetor of a multi-cylinder internal combustion engine, which includes a planar riser surface 20, an intake bow communicating with the cylinders of the engine) 21-, and an intake manifold 26 communicating with the intake boat. A guide pipe 34,h extending in the manifold and located away from the riser surface of the engine, and a guide member 36 facing the riser surface at one end of the guide pipe, the guide member 36 being above the riser surface. the guide member 36 includes a pair of legs @ 38 formed on opposite sides of the plate, the guide member 36 having a pair of legs @ 38 formed on opposite sides of the plate; An internal combustion engine characterized in that a passage is formed in cooperation with the riser surface 20 and opens only at both ends of the riser surface in the axial direction, thereby providing a certain distance between the guide member and the riser surface. Vaporization accelerator.