JPS6361703A - Valve device for internal combustion engine - Google Patents

Abstract

PURPOSE:To reduce the valve area of a combustion chamber, increase the degree of freedom in designing the configuration of combustion portions, make it possible to lessen fuel consumption, and also simplify the structure of a captioned device by utilizing the interior of a hollow exhaust valve as an air intake passageway and providing an induction valve in the exhaust valve. CONSTITUTION:An exhaust valve 6 having aeration passageway 18 therein is provided on an exhaust valve port 4 interconnected to an exhaust passageway 3. An induction valve port 5 is formed on the end of the exhaust valve 6, and an induction valve 10 is provided with the aeration passageway 18 of the exhaust valve 6 penetrated therein above which an aeration port 9 is provided to interconnect an intake passageway 2 and the aeration passageway 18 in the exhaust valve 6. When pressure oil is supplied from a hydraulic fluid supply passageway 13, the exhaust valve 6 is opened accompanying the opening of the induction valve 10. On the other hand, the pressing down of the induction valve 10 resisting an induction valve energizing means 17 opens the induction port 5 for air induction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve device for an internal combustion engine that enables improved combustion and lower fuel consumption of the engine.

[Prior Art] Conventionally, a valve device for an internal combustion engine such as a diesel engine or a gasoline engine is generally formed approximately as shown in FIG.

In the figure, a is a cylinder, and the cylinder ib
An intake valve C and an exhaust valve d are each independently arranged. q is a piston, e is an intake passage, f is an exhaust passage,
h indicates the combustion chamber, and i indicates the valve seat.

During operation of the internal combustion engine, the intake valve C and the exhaust valve d are moved up and down by a rocker arm (not shown) or the like to perform intake and exhaust.

[Problems to be Solved by the Invention] By the way, in conventional valve devices for internal combustion engines, two or four valves are provided on one cylinder lid, so there is not much freedom in the shape of the combustion palm side of the cylinder lid. There was a problem in that it was difficult to ensure a sufficient gas passage area.

In addition, since the intake valve and exhaust valve of this internal combustion engine are installed independently on the cylinder lid, the exhaust valve is constantly exposed to high-temperature gas, and the exhaust valve cannot be cooled sufficiently. There was a problem of corrosion and burnout due to the vanadium contained therein.

[Object of the Invention] The present invention has focused on the above-mentioned problems and has been devised to effectively solve the problems.

The object of the invention is a valve device for an internal combustion engine.

By combining the intake valve and exhaust valve on the same axis, a sufficient gas passage area is secured.

During the period when the intake valve is open, the exhaust valve seat can be cooled by the intake air, which can keep the temperature rise of the exhaust valve seat to a small level and ensure that the life of the valve is not shortened. It can be prevented.

In addition, by increasing the diameters of the intake and exhaust valves, the flow resistance of intake and exhaust air is reduced, allowing smooth gas exchange, and the intake guide vanes provided on the inside of the exhaust valve create a swirl in the intake air. It is an object of the present invention to provide a valve device for an internal combustion engine that is effective in improving combustion efficiency.

[Summary of the Invention] In order to achieve the above object, the present invention provides a cylinder lid having an exhaust valve port that connects an intake passage and an exhaust passage of an internal combustion engine, and a cylinder lid provided at the exhaust valve port of the cylinder lid. a cylindrical exhaust valve having a ventilation passage; an exhaust valve lid provided on the top of the exhaust valve and having a hydraulic pressure supply passage for opening the exhaust valve; a cylindrical exhaust valve biasing means receiver having a flange at one end fixedly attached to the exhaust valve; and a vent hole drilled in the valve stem of the exhaust valve so as to communicate the intake passage with the cylindrical interior of the exhaust valve. , an intake guide vane provided around the air passage of the exhaust valve;
An intake valve port provided on a valve seat of the exhaust valve; and an intake valve provided in the intake valve port by being loosely inserted into the air passage of the exhaust valve and passing through the exhaust valve biasing means receiver.

and an intake valve biasing means fixed to the top of the intake valve.

A biasing means for driving the exhaust valve and a biasing means for driving the intake valve are provided to ensure a sufficient gas passage area, suppress the temperature rise at the valve seat of the exhaust valve, and reduce the life span of the valve seat. The purpose of this invention is to improve combustion efficiency by preventing this and providing intake swirl.

U example] DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a preferred embodiment of the invention.

In the figure, an intake passage 2 is provided in the upper part of the cylinder lid 1, and an exhaust passage 3 is provided in the lower part of the cylinder M1 (
P, again. An exhaust valve port 4 is formed on the combustion chamber 19 side of the lower surface of the cylinder lid 1, and the valve port 4 and the exhaust passage 3 are communicated with each other. A cylindrical exhaust valve 6 is provided at this valve port 4 so as to pass through the cylinder M1, and this exhaust valve 6 and the intake passage 2
A plurality of ventilation holes 9 are bored in the valve stem of the cylindrical exhaust valve 6 at the intersection with the cylindrical exhaust valve 6 to communicate with the ventilation passage 18 inside the cylindrical exhaust valve 6. An intake guide vane 8 is fixedly installed in the ventilation passage 18 .

The cylindrical exhaust valve 6 is provided so as to pass through the cylinder lid 1, and an exhaust valve lid 2 is provided on the top surface of the cylinder M1 so as to cover the top of the exhaust valve 6. ing.

Furthermore, a cylindrical exhaust valve biasing means receiver 14 having a flange at one end is provided at the top of the valve stem of the exhaust valve 6 so as to penetrate through the exhaust valve cover 12.

On the other hand, the intake valve 10 is connected to the intake valve port 5 provided on the valve umbrella 7 of the cylindrical exhaust valve 6.
It is loosely inserted into the exhaust valve biasing means 14 and protrudes from the intake valve biasing means receiver 15 .

As described above, the exhaust valve 6 and the intake valve 10 combined inside the exhaust valve 6 are configured to be driven by the exhaust valve spring 16 and the intake valve spring 17 as biasing means.

That is, the exhaust valve cover 12 and the exhaust valve biasing means 1
An exhaust valve spring 16 is interposed concentrically with the center of the exhaust valve 6 between the exhaust valve cover 12 and the intake valve biasing means receiver 15. An intake valve spring 17 is sandwiched concentrically.

In addition to a spring, a diaphragm or the like may be used as the biasing means.

The exhaust valve cover 12 is provided with a hydraulic pressure transmission hole 13 for opening the exhaust valve 6 using hydraulic pressure.

Next, the operation of the present invention configured as above will be described.

First, the compression/combustion stroke of the internal combustion engine is performed with the intake valve 10 and the exhaust valve 6 closed. During the exhaust stroke, the exhaust valve 6 opens and exhaust gas is discharged from the combustion chamber 19.

Next, as the exhaust approaches the end, the intake valve 10 begins to hear,
Exhaust valve 6 is closed. When the intake valve 10 hears.

Combustion air or mixed gas passes from the intake passage 2 through the ventilation hole 9 and through the ventilation passage 18 inside the cylindrical exhaust valve 6 to the valve port 5.
It flows into the combustion chamber 19 through the. At the end of the intake stroke, the intake valve 10 closes.

During the compression/combustion stroke, the intake valve 10 and the exhaust valve 6 are in a closed state, so that the high-temperature, high-pressure gas in the combustion chamber 19 can be reliably maintained.

The operation of the intake valve 10 is to move the intake valve 10 downward by the same stroke as the opening speed of the exhaust valve 6, and then roughly move the intake valve 10 downward at the time when the intake valve 10 is opened next. After the intake valve is closed, the intake valve 10 is moved upward by the repulsive force of the intake valve spring 17, and the intake valve 10 is closed. Also.

When opening the exhaust valve 6, hydraulic pressure is supplied from a hydraulic pressure supply hole 13 provided in the exhaust valve lid 12 to operate it.

On the other hand, the intake guide vanes 8 provided in the ventilation passage 18 on the inner surface of the exhaust valve 6 rotate the flow of intake air during the intake stroke.
Swirl can be generated in the flow of intake air, contributing to improved combustion efficiency.

[Effects of the Invention] As described above, according to the valve device for an internal combustion engine of the present invention,
It exhibits two types of excellent effects as described below.

(1) Since the intake valve is loosely inserted into the cylindrical exhaust valve, the shape of the cylinder lid on the combustion chamber side can be freely selected.
Sufficient gas passage area can be secured.

(2) Since the exhaust valve is cooled by the intake air while the intake valve is open, the temperature rise of the exhaust valve can be kept small, corrosion and burnout can be suppressed, and the life of the valve can be prevented from being shortened.・Inspection intervals can be extended.

(3) The diameters of the intake and exhaust valves can be made sufficiently narrow, reducing the resistance to the flow of intake and exhaust air, allowing for smooth gas replacement.

Furthermore, it becomes easy to design an exhaust valve of an optimal size for the diameter of the cylinder, and the performance of the internal combustion engine can be improved.

(4) The intake guide vanes provided on the inner surface of the exhaust valve can swirl the intake air, improving combustion efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention. FIG. 2 does not show a conventional example. In the figure, 1... cylinder lid, 2... suction passage, 3...
・Exhaust passage, 4...Exhaust valve port, 5...Intake valve port, 6...Exhaust valve, 7...Valve umbrella, 8...Intake guide vane, 9...Vent hole , 10... Intake valve, 11... Valve umbrella, 12... Exhaust valve cover. 13... Hydraulic feed path, 14... Exhaust valve biasing means,
15... Intake valve spring, 16... Exhaust valve spring, 17.
...Intake-10=valve biasing means, 18...ventilation path, 19...combustion chamber.

Claims (1)

[Scope of Claims] 1) A cylinder lid having an exhaust valve port that connects an intake passage and an exhaust passage of an internal combustion engine, and a cylindrical exhaust valve having a ventilation passage provided at the exhaust valve port of the cylinder lid. and an exhaust valve lid provided at the top of the exhaust valve and having a hydraulic pressure supply path for opening the exhaust valve;
A cylindrical exhaust valve biasing means receiver having a flange at one end is fixed to the top of the exhaust valve by penetrating the exhaust valve lid, and the exhaust valve is configured to communicate with the intake passage and the cylindrical interior of the exhaust valve. A ventilation hole formed in the valve stem of the exhaust valve, an intake guide vane provided around the ventilation path of the exhaust valve, an intake valve port provided in the valve seat of the exhaust valve, and the intake valve port. an intake valve that is loosely inserted into the ventilation passage of the exhaust valve and is provided through the exhaust valve biasing means receiver; an intake valve biasing means receiver that is fixedly installed on the top of the intake valve; and an intake valve that drives the exhaust valve. A valve device for an internal combustion engine, comprising: a biasing device for driving the intake valve; and a biasing device for driving the intake valve. 2) the exhaust valve cover, the exhaust valve biasing means receiver, an exhaust valve spring narrowly mounted concentrically with the center of the exhaust valve, the exhaust valve cover, the intake valve biasing means receiver, and the exhaust valve; The valve device for an internal combustion engine according to claim 1, wherein the biasing means includes an intake valve spring narrowed concentrically with respect to the center.