SU1710805A1 - Cylinder head of internal combustion engine - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to engine-building, and makes it possible to reduce pumping losses. The cylinder head of an internal combustion engine has curved intake ports, valves with rods and bushings protruding into the flow path of the channel. Improving the hydraulic characteristics of the channel is achieved by optimizing the geometrical parameters of the following channel elements: the radius of the entrance to the throat of the channel along the lower profile line, the protrusions covering the valve sleeves, the length of the cylindrical vertical part of the channel neck, flattening the channel in the area of the air flow turning. 3 il.

Description

FIELD OF THE INVENTION The invention relates to mechanical engineering, namely engine building.

The cylinder heads of internal combustion engines are known, which contain curved inlet ducts with round inlets, valves with rods and bushings protruding into the flow path of the ducts, with protrusions on the duct walls covering the bushes and gradually decreasing in height the distance from them, while having an area of flow areas of the channels in the area of the bushings 1.0-1.3 from the area of flow areas of valve seats.

However, in known heads, due to the insufficient length of the protrusions covering the valve sleeves, the small radius of air entering the cylindrical part of the channel neck along the lower line of the channel profile, the insufficient length of the vertical part of the channel neck, including the cylindrical part of the channel neck and transition chamfers, are performed in the zone a relatively sharp rotation of the air flow, the lower part of the channel cross-sectional contour as part of a circle and other imperfect shapes and sizes of the elements of the inlet channel There are significant pumping losses and a low engine fill ratio. As a result, the fuel economy of the internal combustion engine is reduced.

The purpose of the invention is to increase the fuel economy of the engine by reducing pumping losses.

This goal is achieved by the fact that in the cylinder head of an internal combustion engine, containing curved dual inlet channels with circular inlets, valves with rods and bushings protruding into the flow path of the channels, with protrusions covering the bushings and gradually decreasing in height as they move away from them, the area of the flow areas of the channels in the area of the sleeves is 1.0-1.3 times the area of the flow area of the valve seats, these protrusions start at a distance of Tavlya yuschem 1.0-1.5 distance, along the upper line profile of the channel from the axis of the intake valve prior to the separation channel, the radius R input

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the air in the cylindrical part of the channel neck along the lower line of the channel profile is 0.50-0.80 channel diameter D, the vertical part of the channel neck itself, including transition chamfers, has a height of 0.25-0.40 diameter mouth channel D, directly after entering the double channel, the channel cross section contour smoothly passes from the circle to the rectangle with rounded corners, the ratio of the height of the rectangle to its base is smaller. 1.0 both at the double part and after the separation of the channels, and after the separation of the channels, the smallest value of this ratio is 0.6-0.8, after the zone of greatest flattening along the inlet flow, the rectangular cross-section with rounded corners smoothly passes into the vertical cylindrical part of the neck of the channel.

FIG. 1 shows the cylinder head section; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. 2

The cylinder head contains inlet channels 1 with curvilinear doubles with round inlets, valves with rods and bushings (not shown), on the walls of the channels 1, protrusions 2 are made, covering the sleeves and gradually decreasing in height as they move away from them, and in the area of the sleeves on either side of the projections 2

nor GE), smoothly rounds the sleeves along the depressions 3. The elongation of the depressions 3 and protrusions 2 allows for a more gradual restructuring of the air flow and reduces

5 with vortex formation. Due to the rectangular shape with the rounded corners of the channel cross section, the air flow during a sharp turn when entering the mouth of the channel bends around the channel profile lines with a decrease in flow disruptions due to a decrease in the uneven velocities of adjacent flow streams. An increase in radius R has the same effect. Further, the flow enters the cylindrical part of the inlet throat, with increasing height 5 of which the stabilization of the flow in front of the air entering the annular valve slit increases and the pressure loss in the intake path decreases further.

The use of the invention allows to reduce pumping losses during operation of the internal combustion engine and thereby improve its fuel efficiency.

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Claims (1)

Invention Formula  The cylinder head of an internal combustion engine containing single-function curvilinear dual inlet channels with circular inlets, valves with rods and bushings, has recesses 3. Moreover, the protrusions 2 of and recesses 3 begin at a distance of 1.0-1.5 distances along the upper line of the channel profile from the axis of the inlet channel before the start of channel separation. FIG. 3, it can be seen that the drawn tangent plane to the dividing line line G-E, which is simultaneously perpendicular to the axis of the inlet channel, gives the initial section of the divided channel. In Fig. 3, the intersection of this plane with the upper line of the channel profile is indicated by a dot / С. The intersection of the upper profile line of the inlet channel with the axis of the intake valve is indicated by point C. Thus, the protrusions 2 and depressions 3 begin at a distance of 1.0-1.5 of the length of the C / C curve. The ratio of the height H n - mc OG with the rounded corners of the contour of the cross section of the channel to the base L of the rectangle is less than 1.0; in the zone of greatest flattening of the divided channel, this ratio is 0.6-0.8. Air enters the channel neck along the bottom line of the channel profile along the radius R, which is (0.50-0.80) D where D is the diameter of the channel neck. The vertical cylindrical part of the channel neck, including the chamfers, has a height S of (0.25-0.40) D. During the operation of the internal combustion engine, the intake air flow enters the curvilinear twin ducts 1, separates at the channel separation point (li35 on the walls of the channels along their axes there are protrusions covering the bushes and gradually decreasing in height as they are removed from them; the area of the flow sections of the channels in the area of the sleeves is 1.0 ... 1.3 of the area of the flow sections of the valve seats, that, in order to reduce pumping losses, the protrusions start at a distance of 1.0 ... 1.5 distances, along the upper line of the channel profile, from the axis 40 of the intake valve before the separation of the channels begins; the radius R of the air inlet into the cylindrical part of the channel neck along the lower line of the channel profile is 0.50 ... 0.80 in diameter of the channel neck D, the vertical cylindrical part of the channel itself, 45, including transitional chamfers, has a height of 0.25 ... 0.40Ј, directly after entering the dual channel, the channel cross-sectional contour smoothly changes from a circle to a rectangle with rounded corners. . the base is less than 1.0 both at the double part and after the separation of the channels; moreover, after the separation of the channels, the smallest value of this ratio is 0.6 ... 0.8, after the zone of maximum flattening along the inlet flow is rectangular with rounded corners the channel cross-section smoothly passes into the vertical cylindrical part of the channel neck. nor GE), smoothly rounds the sleeves along the depressions 3. The elongation of the depressions 3 and protrusions 2 allows for a more gradual restructuring of the air flow and reduces at the same time vortex formation. Due to the rectangular shape with the rounded corners of the channel cross section, the air flow during a sharp turn when entering the mouth of the channel bends around the channel profile lines with a decrease in air flow disruptions due to a decrease in the uneven velocities of adjacent flow streams. An increase in radius R has the same effect. Further, the flow enters the cylindrical part of the neck of the inlet channel, with an increase in height 5 of which the stabilization of the flow in front of the air entering the annular valve slit increases and the pressure loss in the intake path decreases further. The use of the invention allows to reduce pumping losses during operation of the internal combustion engine and thereby improve its fuel efficiency. 0 25 Invention Formula  The cylinder head of an internal combustion engine containing single-function curvilinear dual intake ducts with round inlets, valves with rods and bushings extending into the flow part of the duct,  Zoopayuschimi in the flow part of the channel, and 35 on the walls of the channels along their axes there are protrusions covering the bushes and gradually decreasing in height as they are removed from them; the area of the flow sections of the channels in the area of the sleeves is 1.0 ... 1.3 of the area of the flow sections of the valve seats, that, in order to reduce pumping losses, the protrusions start at a distance of 1.0 ... 1.5 distances, along the upper line of the channel profile, from the axis 40 of the intake valve before the separation of the channels begins; the radius R of the air inlet into the cylindrical part of the channel neck along the lower line of the channel profile is 0.50 ... 0.80 in diameter of the channel neck D, the vertical cylindrical part of the channel itself, 45, including transitional chamfers, has a height of 0.25 ... 0.40Ј, directly after entering the dual channel, the channel cross-sectional contour smoothly changes from a circle to a rectangle with rounded corners. . the base is less than 1.0 both at the double part and after the separation of the channels; moreover, after the separation of the channels, the smallest value of this ratio is 0.6 ... 0.8, after the zone of maximum flattening along the inlet flow is rectangular with rounded corners the channel cross-section smoothly passes into the vertical cylindrical part of the channel neck. 2 FIG. / / SS / SSS / 22 UXX S S S S S Ф «г.З