JPS59211717A - Intake port of internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the pressure loss in an intake passage and improve volume efficiency by controlling the strength of an eddy current by an intake deflecting apparatus, in a wide range ranging from a strong eddy-current range to a weak eddy-current range. CONSTITUTION:The intake flow which flows in an intake passage 15 flows into an eddy-current generating part 16 from an introduction part 19 and further flows into a cylinder chamber 11 through an intake hole 12, and the main flow of the intake flow flows from the position of the axis center of the introduction part 19 to the intermediate position between the periphery of the outside part 17 of the eddy-current generating part 16 and the peripheral surface of a valve shft 14 and flows into the cylinder chamber 11 through the intake hole 12 along the tangential direction to the part close to the intake hole on the peripheral surface of the cylinder chamber 11 and forms an eddy current which swirls along the peripheral surface of the cylinder chamber 11. As the inclination angle beta of an intake deflecting plate 31 increases, the main flow of the intake flow which flows into the eddy-current generating part 16 from the introduction part 19 approaches to the periphery side of the outside part 17 of the eddy-current generating part, and the eddy current generated in the cylinder chamber 11 is intensified.

Description

Detailed Description of the Invention The present invention has an intake hole opened at a position eccentric from the center of the end face of a cylinder chamber, a +954X valve in the intake hole, and an intake passage connected to the intake passage. The invention relates to an intake port of an internal combustion engine provided with the device.

Conventionally, this type of intake port has a connecting end of the intake passage (1) with the intake hole (4), as shown in Figures 1 and 2.
The valve shaft of the intake valve (3 turns is formed in the spiral part (2) that approaches the intake hole (4) while rotating, and the intake air is deflected to the part of the intake passage (1) other than the spiral part (2). As shown in FIG. 3 and FIG.
There is a Tangiensha - intake boat, which is arranged along the tangential h7 direction in the vicinity of the intake hole (9) on the circumferential surface, and has an intake deflection device (E) in a part other than the above-mentioned connecting end of the intake passage (6). .

The helicopter/force μ intake boat has an intake passage (1) and @stoma (4)
), it is possible to generate a strong vortex flow in the cylinder chamber (5), and the strength of the vortex flow can be controlled by the intake air deflection device (c) in the strong vortex area. On the other hand, it is difficult to control the vortex in a weak vortex region, and moreover, there is a spiral part (2) in the intake passage (1).
) and an intake deflector (c), so the intake passage (
1) The pressure loss is large, making it difficult to increase the volumetric efficiency of the cylinder chamber (5). On the other hand, since the tangential intake boat does not have a spiral part in the intake passage (6), it is possible to generate a weak vortex in the cylinder chamber 0(), and in the weak vortex area, the intake deflector (a) Although it is possible to control the strength of the vortex, it is difficult to control the vortex in a strong vortex region, and moreover, the intake passage (
6) The pressure loss is large, making it difficult to increase volumetric efficiency.

As a result, in the conventional intake port, the strength of the vortex cannot be controlled in a wide range from a strong vortex region to a weak vortex region under high volumetric efficiency.

Therefore, an object of the present invention is to provide an intake port for an internal combustion engine that can control the strength of the vortex flow in a wide range from a strong vortex region to a weak vortex region with high volumetric efficiency.

The present invention provides an intake port for an internal combustion engine in which an intake hole is opened at a position eccentric from the center of the end face of a cylinder chamber, an intake valve is provided in the intake hole, and the intake passage is connected to the intake port. Consisting of a vortex generating part at the end of the passage communicating with the hole and surrounding the intake valve, and an introduction part other than the end of the passage, the width between the circumferential surface of the valve shaft of the intake valve and the circumferential surface of the vortex generating part facing it,
The outer part on the side of the cylinder chamber is made wider than the inner part on the middle/U side of the cylinder chamber, and the introduction part is connected to the wide outer part of the vortex generating part, so that the opening surface of the intake hole and the vortex generating part facing it are connected to the introduction part. The height between the ceilings is kept the same or decreased from the wide outer part to the narrow inner part around the valve stem, and the average decrease is equal to the diameter of the intake hole per 7 degrees around the valve stem. 0/
g% or less, and is provided with an intake deflection device that deflects the intake air flowing from the introduction part of the intake passage into the vortex generation part in a plane parallel to the opening plane of the intake hole. It is a port.

As is clear from the experimental results described below, this intake port is capable of controlling the strength of the vortex flow in a wide range from strong vortex region to weak vortex region with the intake deflection device. Loss is small and volumetric efficiency can be improved.

Next, examples of the present invention will be described.

First Embodiment (See Figures S to 7) As shown in Figures 5 and 6, the intake port of the internal combustion engine of this example is located on the circular end face of the cylinder chamber Ou from the center to the periphery ( Open the circular intake hole a at the centered □ position, install the intake valve α east of the poppet valve in the intake hole 04, connect the intake passage (lFll), and connect the intake passage 09 to the intake hole (1). It consists of a vortex generation part (ILl) at the end of the passage surrounding the intake valve (1) and an introduction part +ltJ other than the end of this passage, and the aspect of vortex generation +flj (IQ) is defined by the valve axis Q4 of the intake valve.
) is formed by connecting the three cylindrical parts facing the curves of the valve stem (141) to the peripheral surface of the valve stem (141 and the /71 &
The width between the circumferential surfaces of the flow generation part 09 is defined as: the outer part aη on the cylinder chamber Qn Mr surface side and the inner part Q on the cylinder chamber center side
It is made wider and gradually narrowed between the outer part θη force and the inner part Ogl around the valve axis a<, and the vortex generating part 01
The introduction part (
119 is connected, and the height between the ceiling of the intake hole (seven opening surfaces and the vortex generation Rt'1 (lf9) facing this is set to the valve shaft 0
4), the diameter d of the intake hole is kept constant or gradually decreased from the wide outer part surface to the narrow inner part 0S, and the amount of decrease is determined by the diameter d of the intake hole per 7 degrees around the valve stem (14). 0 of
Within 7g5, specifically 006%, a rectangular intake deflection plate 0υ is loosely fitted into the square cylindrical introduction part a'J of the intake passage, and the intake deflection plate 1υ is set on the inner wall of the introduction part 01. Attach the base end with the pivot ((4), and make the tip of the intake deflection plate C (17 facing the vortex generation area) rotatable toward the outer wall side of the introduction part OI, Intake 1 (4-direction device) that can deflect the intake air flow flowing into + (9) in a plane parallel to the opening plane of the intake hole (to).

In this intake port, the intake air flowing through the intake passage (tQ) flows from the introduction section 0%l into the vortex generation section (IQ,
It flows into the cylinder chamber 0υ through the intake hole a'4, and the main flow of the intake air flows from the axial position of the introduction part 01 to the area between the circumferential surface of the outer part aη of the vortex generating part and the surface of the valve shaft (I4). It flows into the intermediate position, passes through the intake holes 0 to 1, flows into the cylinder chamber (lυ) along the tangential direction of the portion of its circumferential surface near the intake hole, and becomes a vortex swirling along the circumferential surface of the cylinder chamber Ql.

As the inclination angle β of the intake deflection plate 0υ made with respect to the inner wall of the introduction part (11) increases, the main flow of the intake air flowing from the introduction part 01 into the vortex generation part α becomes the angle of the outer part αη of the vortex generation part As the cylinder moves closer to the side, the vortex generated in the cylinder chamber 0υ becomes stronger.

In the intake boat of this example, the inclination angle β of the intake deflection plate 0υ is added to each value, and for each value, the strength of the vortex generated in the cylinder chamber OI, that is, the swirl ratio SR, and the pressure loss ΔP of the intake passage Q9 are calculated. As a result, we obtained experimental results as shown by the solid line in the diagram in Figure 7. For comparison, the inclination of the intake deflector plate is also the same for the helical intake boat shown in Figs. 1 and 2 and described above, and the Tangier 7-shall intake boat shown in Figs. When the swirl ratio SR and the pressure loss ΔP were determined with respect to the angle β, experimental results were obtained as shown by the broken line and chain line in the diagram, respectively.

As is clear from the upper half of Fig. In this case, the strength of the vortex can be controlled by the intake air deflector (c) only in the vortex area where the swirl ratio is low. In contrast, in the intake port of this example, the strength of the vortex flow can be controlled by the intake air deflection device C1) in a wide range from the vortex region with a high swirl ratio to the vortex region with a low swirl ratio.

Furthermore, as is clear from the lower half of the diagram, in the intake port of this example, the pressure loss in the intake passage α9 is smaller than that in the helical intake port and that in the tangential intake port. , Therefore, the volumetric efficiency of the cylinder chamber 0υ is high.

Second Embodiment (See Fig. g) The intake port of the internal combustion engine of this example has a rotatable intake deflection plate II in the intake deflection device (to) of the previous example.
) is provided with an intake deflection plate with a triangular cross section that can slide along the inner wall of the tapered square cylindrical introduction section. Other points are the same as those in the previous example, so the same reference numerals are given to FIG. 5 and the explanation will be omitted.

Third Embodiment (Refer to Figure 3) The intake port of the internal combustion engine of this embodiment has an intake deflection plate C ( l), in addition to the introduction (
Intake deflection plate (to) similarly pivoted to the outer wall of 11J
It has been established. The other points are the same as those in the first embodiment, so the same reference numerals are given to the second figure and the explanation thereof will be omitted.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional helical intake boat, Figure 2 is a cross-sectional plan view of the same helical intake boat, Figure 3 is a perspective view of a conventional tangential intake boat, and Figure 2 is a perspective view of the same tangential intake boat. This is a cross-sectional plan view of a shal intake boat. The third figure is a perspective view of the intake port of the first embodiment of the present invention, FIG. 6 is a cross-sectional plane of the same intake boat, and FIG. [It is a diagram showing the relationship between angle and swirl ratio or pressure loss. FIG. 5 is a cross-sectional plan view of an intake port according to a second embodiment of the present invention, and the second figure is a cross-sectional plan view of an intake port according to a third embodiment of the present invention. 11 Niji cylinder chamber 12: Intake hole 13: Intake valve
14: Valve shaft 15: Intake passage 16
: Eddy current generating part・17: Outer part 18: Inner part 19: Introducing part 30: Intake deflection device Fig. 1 25 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] In the intake port of an internal combustion engine, in which a hole is opened at a position eccentric from the center of the cylinder chamber, an intake valve is provided in the intake hole, and the intake passage is connected to the intake port, the intake passage is communicated with the intake hole. It consists of a vortex generating part at the end of the passage surrounding 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 surface of the vortex generating part facing it is the outer side of the cylinder chamber side. The part is wider than the inner part on the center side of the cylinder chamber, and the introduction part is connected to the wide outer part of the vortex generating part.
The height between the opening surface of the intake hole and the ceiling of the vortex generating part facing it is kept the same or decreased from the wide outer part to the narrow inner part around the valve shaft, and the average decrease amount is set within 0/% of the diameter of the intake hole per degree around the valve shaft, and the intake flow flowing from the introduction part of the intake passage into the vortex generation part is deflected in a plane parallel to the opening surface of the intake hole. An intake boat for an internal combustion engine, characterized in that it is provided with an intake deflection device.