JPS6098126A - Suction port for internal-combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an inner P engine in which an intake hole is opened at the end 161 of the cylinder chamber at a position eccentric from the center LL), an intake valve is provided in the intake hole, and an intake passage is connected. Regarding the intake port.

The present inventor has discovered that in this type of intake port,
Moderately cheap? In order to generate a vortex flow without reducing the volumetric efficiency, the intake passage is composed of a vortex generation part at the end of the passage that communicates with the intake hole and surrounds one intake valve, and an introduction part other than this passage end, and the intake passage The width between the circumferential surface of the valve shaft and the circumference iii of the vortex generating portion facing this is made wider in the outer part on the cylinder chamber circumferential surface side than in the inner part of the cylinder chamber,
Connect the introduction part to the wide outside of the vortex generating part (I11 part,
The height between the opening surface of the intake hole and the ceiling of the vortex generation part facing it is reduced from the wide outer 1111 part to the narrow inner part around the valve shaft, and the average amount of reduction is We have invented an intake port for an internal combustion engine that is set at 0% or more and 07g% or less of the diameter of the intake hole per 7 degrees around the valve stem. This invention is able to achieve its objectives, however, strong vortices can be reduced to a medium with high volumetric efficiency. It's hard to say that.

An object of the present invention is to provide an internal combustion air intake boat that can improve the above-mentioned conventional air flow and generate a strong vortex flow with high volumetric efficiency.

In order to achieve the above-mentioned object, the present invention is based on the results of experiments, and includes some limitations on the above-mentioned conventional invention.

That is, in the above-mentioned previous invention, the water valve 1311 is located within 1 u of the introduction part in m1 which is flat with the opening surface of the intake hole.
This is an intake boat for an internal combustion engine, characterized in that the width of the outer part of the vortex generating part is set to 47 times or more and 2.lr times or less than the width of the 1111 part in a plane that intersects the line 1.

This intake boat is clearly J:
Therefore, a strong vortex can be generated with high volumetric efficiency.

Next, examples of the present invention will be described.

As shown in FIGS. 1 to 3, the intake boat of the internal combustion engine of this example has a circular intake hole U21 opened in the circular end face of the cylinder chamber (lυ) at a position eccentric from the center toward the periphery.
An intake valve (1'3) of the poppet valve is provided at the intake hole 11, and the intake passage 01 is connected to the intake passage IJ1, and the intake passage IJ1 is connected to the intake hole (2) to surround the warm-up valve 0. It is composed of OQ and the introduction part (II) other than the end of this passage, and the surface of the vortex generating part IJfe is formed by smoothly connecting two cylindrical surfaces facing the circumferential surface of the valve shaft (141) of the intake valve. , the circumferential surface of the valve stem (14) and the vortex generating portion 1.1 (
90 The width between the circumferential surfaces is defined as the outer part t171 of the cylinder chamber Uυ circumferential surface 1111 and the inner part t′i of the center of the cylinder chamber (
Wider than Is, the outer portion Uη is formed around the valve shaft t14).
The inlet part (1g) is connected along the tangential direction to the wide outer part (17) of the vortex generating part, which gradually narrows between the inner 1111 part 081 and the opening surface of the intake hole 0. The height between the ceiling of the vortex generating part (IQ facing the valve stem) is kept the same or gradually decreased from the wide outer part around the valve shaft (14) to the narrow inner part U81, and The amount of reduction is added within 0. / f% of the diameter d of the intake hole (1z) per 7 degrees around the valve shaft (Ml). In the plane that is perpendicular to the inner jD line of the part OI and includes the center line of the valve shaft 0Φ, the width Wl of the outer part aη of the vortex generating part is 2°g times the width W2 of the inner 0111 part + 1110 // times or more. less than,
Specifically, %W1=/7ko5M1w2=/Il, ,
2 S am y 1 / w2 = /,, 2 / L
Set'! are doing.

In this intake boat, the intake air flowing through the intake passage (II'9) flows from the introduction part (11) into the vortex generating part (1G), and flows into the cylinder chamber (11) through the intake hole (12).
Also. The main flow of the intake air flows from the middle Iutg position of the introduction part to the intermediate position 11q between the circumference of the outer 11111 part 171 of the vortex generating part and the circumference 1111 of the valve shaft, and flows into the cylinder via the intake hole ('; mouth). A vortex flow flows into the chamber (IQ) along the tangential direction of the peripheral surface of the cylinder chamber 1111 near the intake hole, and swirls along the circumference +m of the cylinder chamber 1111.

In the intake boat of the above embodiment, the outer portion u
The ratio of the width of 7) to the width of the inner brightness W1'/W2 is 8
When we looked at the strength of the vortex generated in the cylinder chamber 1111, that is, the swirl ratio SR, and the pressure loss ΔP in the intake passage (1f1) for each of the 8 values, we found that the fourth value is shown in Figure #i in the figure. The results shown are obtained.

As is clear from the upper and lower halves of the diagram, if the above width ratio "+/w" is smaller than Z/, then 23g
As the diameter increases, the swirl ratio SR decreases and the pressure loss ΔP increases, increasing the width ratio W 1 / W
When 2 is /, 7 or more and force is 21g or less, the swirl ratio is 81
4 is large and the pressure loss ΔP is small.

That is, a strong vortex flow occurs under high volumetric efficiency.

Furthermore, when the width ratio W1/W2 is 15 or more and 2.0 or less, even better performance is obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an intake boat according to an embodiment of the present invention;
The figure is a cross-sectional view taken along the line K-R in Figure 1, Figure 3 is a cross-sectional view taken along the line T-L in Figure 1, and the second figure shows a stool ratio of 8H at the same intake port, a ratio of pressure loss ΔP of 10 to width. W! It is a diagram showing the relationship of /W2. 11 Niji cylinder chamber 12: Intake hole 13: Intake valve 14: Valve Shaft 15: Suction passage 16; Whirlpool generating part 17: Outside part 18: Inner part 111 part 19: Introductory part Fig. 1 Fig. 3 Fig. 4] 1°1″52283 1°1w1/J2

Claims (2)

[Claims] (1) In the intake port of an internal combustion engine in which a first-stage air hole is opened at a position eccentric from the center of the end face of the cylinder chamber, an intake valve is provided in the intake hole, and the intake passage is connected, the intake passage is connected to the intake hole. It consists of a vortex generating part at the end of the passage that communicates with the intake valve and an introduction part other than the end of the passage, and the width between the circumferential surface of the valve shaft of the intake valve and the circumferential surface of the vortex generating part facing the kneading part is the width of the cylinder chamber. The peripheral surface (outside of +111 (+'l+1 part is wider than the inner part on the center side of the cylinder chamber, the introduction part is connected to the wide outer part of the vortex generating part, and the introduction part is made in a plane parallel to the opening surface of the intake hole. The width of the outer 41111 part of the vortex generating part in the plane perpendicular to the center line of the part is the width of the inner part
The height between the opening surface of the intake hole and the ceiling of the vortex generation section facing it is set between the wide outer part and the narrow inner part around the valve stem. An intake port for an internal combustion engine, characterized in that the average reduction in the diameter of the intake port is set at 05 or more and less than a/za% of the diameter of the intake hole per 7 degrees around the valve shaft. (2) The width of the outer part of the vortex generating part in the plane perpendicular to the center line of the introduction part in the plane parallel to the opening plane of the intake hole is /, 75 times or more and 2°0 times the width of the inner 911 part. An intake 9c port for an internal combustion engine according to claim 1, characterized in that: