JPH0229206Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a valve seat ring for an intake passage of an engine controlled by a valve, and includes a conical valve seat annular surface and a flow direction A flow opening is connected to the rear of this and forms a part of the intake passage and gives swirl to the combustion chamber airflow, and a part of this flow opening is parallel to the valve seat ring axis. The wall of the virtual cylinder has an axis, and the other part of the flow opening is surrounded by an annular ridge protruding into the flow opening, the outer surface of which extends at the narrowest cross-section. It relates to a form that expands from the valve seat to the valve seat.

[Prior Art] In the valve seat ring for an internal combustion engine disclosed in FIGS. 13 and 14 of DE-PS1038832, the axis of the valve seat ring is An annular ridge projects laterally into the cylindrical flow opening, which is located coaxially with respect to the valve axis, and its length towards the valve axis decreases towards the ends. This annular ridge degrades the steady flow coefficient of the flow aperture. This is because the annular ridge terminates in a stepped step in the cylindrical portion of the flow opening. Moreover, this type of valve seat ring is difficult and expensive to manufacture due to the asymmetrical nature of the annular ridge at its smallest cross section.

EP0049075A1 discloses a similar valve seat ring, according to which a flow opening is likewise arranged coaxially to the valve seat axis,
A deflector partially projects into this flow opening. The side of the deflector that receives the incoming combustion air is
The configuration is such that the air is deflected towards the wall opposite the flow opening. Furthermore, the free edge of this deflection body is bounded by two arc-shaped curved sections, by which the deflected air is divided into two diverging sub-streams. The purpose of this arrangement is to direct the combustion air out approximately to one side of the valve. In that case, the generation of vortices behind the deflection body, which impairs the flow coefficient, must be taken into account. Furthermore, this valve seat ring is likewise expensive to manufacture.

OBJECT OF THE INVENTION The object of the invention is to provide a swirl-generating valve seat ring of the type mentioned at the outset, which is simple to manufacture and ensures an effective steady-state flow coefficient in the inlet passage. There is a particular thing.

[Means for Solving the Problems] The gist of the present invention that solves the above problems is as described in the first claim of the utility model registration. Advantageous embodiments of the invention are specified in claim 2.

[Example] The invention will now be explained with reference to the illustrated embodiment.

The valve seat ring, designated in the drawing by reference numeral 1, has a flow opening 2 which, downstream in the flow direction, has a conical valve seat annular surface 3 and is controlled by the valve. It forms a part of the intake passage 5 provided in the cylinder head 4 of the engine.
An angularly matched valve seat surface of an intake valve (not shown) cooperates with the valve seat annular surface 3 . Valve seat ring 1 is the second
As can be seen from the figure and Fig. 5, the cylinder head 4
It is inserted into a receiving recess 6 provided in the.

According to the invention, a part of the flow opening 2 is surrounded by the outer surface 7 of the annular ridge 8. In that case,
The maximum axial length of this annular bulge is the same in all axial sections. The outer surface 7 forms a diffuser which widens from the cross section of the annular ridge with the narrowest diameter in a hopper-like or trumpet-like manner coaxially with respect to the valve seat annular surface 3 toward the valve seat annular surface 3. The other part of the flow opening 2 is surrounded by a cylindrical wall 9, the axis of which runs parallel and eccentrically to the valve seat ring axis. This wall surface 9 is formed by milling a part of the annular protrusion 8 of the valve seat ring 1 about an axis that is parallel but eccentric to the axis of the annular protrusion 8 . The portion cut away from the annular ridge 8 is shown in dashed lines on the left side of FIGS. 3 and 6.

Milling radius R indicated by arrows in Figures 3 and 6
9, the radius of the cylindrical wall 9 is preferably equal to or slightly larger than the radius R7 of the narrowest annular ridge cross section. The center point of the milling shown in FIGS. 3 and 6, that is, the center point M9 of the wall surface 9, is eccentric from the axis M1 of the valve seat ring 1 by a distance X so that the valve seat annular surface 3 is not cut.

The uncut portion of the annular ridge 8 forms an approximately straight wall surface in cross section from the narrowest cross section of the annular ridge to the plane at the inlet of the valve seat ring 1 (FIG. 2). It extends in the form of an elongated or rounded wall (FIG. 5) and terminates in an abutment surface 10 on the inlet side. The valve seat ring 1 is supported by this abutting surface 10 against a corresponding opposing surface of the receiving recess 6. The maximum internal diameter of the flow opening 2 on the inlet side of the valve seat ring 1 is equal to the diameter of the intake channel 5 . The intake channel 5 has a circular cross section at least in the plane of its connection to the valve seat ring 1 .

The valve seat ring 1 based on the present invention is a machined product,
As shown in FIGS. 1 and 4, in the initial manufacturing stage, all the outer and inner surfaces are already manufactured coaxially to the valve seat ring axis M1, with predetermined dimensions, and into a shape that allows assembly. This milled product is then milled eccentrically and parallel to the axis in the next machining step. With this, the valve seat ring 1 is completed.

When the valve seat ring 1 formed in this way is assembled into the receiving recess 6 machined into the cylinder head,
The uncut portion of the annular bulge 8 (see FIGS. 2 and 5) protrudes into the intake passage, thereby causing a separation-free deflection of the air flow towards the valve seat. In the area of the cylindrical wall 9 this deflection does not take place effectively, so that the combustion air passing therethrough is given the desired swirl.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the valve seat ring according to the first embodiment of the present invention after the first manufacturing stage, and Fig. 2 is a cross-sectional view of the valve seat ring after the final manufacturing stage has been installed on the cylinder head. 3 is a plan view of the valve seat ring shown in FIG. 2, FIG. 4 is a sectional view showing the valve seat ring according to the second embodiment of the present invention after the first manufacturing stage, and FIG. 5 is a plan view of the valve seat ring shown in FIG. 6 is a sectional view of the valve seat ring of the second embodiment attached to the cylinder head after the final manufacturing stage, and FIG. 6 is a plan view of the valve seat ring shown in FIG. 5. DESCRIPTION OF SYMBOLS 1... Valve seat ring, 2... Flow opening, 3... Valve seat annular surface, 4... Cylinder head, 5... Intake passage, 6... Receiving recess, 7... Outer surface, 8... Annular shape Raised portion, 9...Cylindrical wall surface, 10...Abutment surface, M1...Valve seat ring axis, M9...Center point,
X...Distance.

Claims (1)

[Claims for Utility Model Registration] 1. A valve seat ring for an intake passage of an engine controlled by a valve, which is connected to a conical valve seat annular surface and rearward thereof in the flow direction. a flow opening forming a portion of the intake passage and providing swirl in the combustion air flow;
A part of this flow opening is caused by the wall of an imaginary cylinder having an axis parallel to the valve seat ring axis.
and another part of the flow opening is surrounded by an annular ridge protruding into the flow opening, the outer surface of which widens from the narrowest cross section towards the valve seat. In one version, the flow opening 2 widens from the narrowest cross-section towards the differential user, forming the outer surface 9 of the annular ridge 8 forming the differential user.
is located coaxially with respect to the valve seat ring axis, the wall surface 9 of the virtual cylinder extends eccentrically with respect to the valve seat ring axis, and the maximum axial length of the annular protrusion 8 is A valve seat ring for an intake passage of an engine controlled by a valve, characterized in that the diameter is the same in all axial sections. 2. The utility model registered in claim 1, wherein the axis of the virtual cylinder forming the wall surface 9 is eccentrically offset from the valve seat ring axis to such an extent that it does not intersect with the conical valve seat annular surface 3. Valve seat ring.