KR100569374B1 - Valve train system in a car - Google Patents

Abstract

The present invention relates to a valve train system whose structure is improved to reduce the flow resistance of the fluid during the intake and exhaust operation, the configuration is integrally formed with a first rotating shaft having a hollow and one end of the first rotating shaft The first opening and closing is provided with a first rotary member coupled to the first spring member having a restoring force and the semi-circular first valve plate extending to one side on the outer circumference of the other end of the first rotating shaft, the first spring member is coupled to the cam during the rotational movement of the cam A valve;

The second rotary shaft penetrates into the hollow of the first rotary shaft to be coupled to the circular second valve plate, and is interlocked with one end of the second rotary shaft to be interlocked during the rotational movement of the cam. And a second on / off valve having a second rotating body.

According to the present invention, since the valve is opened and closed by the maximum displacement of the cam stroke without the valve stem, not only can the flow resistance of the fluid be reduced during intake and exhaust of the fluid, but also the cylinder head can be compactly designed. And it has a useful effect that can reduce the cost.

Valve train, first and second open / close valve, rotor, camshaft, flow resistance

Description

VALVE TRAIN SYSTEM IN A CAR

1 is a block diagram showing a valve train system of a vehicle according to the present invention.

Figure 2 is an exploded perspective view of the main portion of Figure 1;

3 is a plan sectional view showing a coupling state of FIG.

Figure 4a, b is a use state diagram of the present invention,

4A illustrates a state in which the first and second valve plates are simultaneously opened and closed;

4B illustrates a state in which the first and second valve plates are individually opened and closed with a time difference.

5 is a cross-sectional view showing a valve train system of a typical vehicle.

Explanation of symbols on the main parts of the drawings

100,200: first and second open / close valve

110: first rotating shaft 110a: hollow

120: first rotating body 130: first valve plate

150: first spring member 210: second rotating shaft

220: second rotating body 230: second valve plate

250: second spring member 300: camshaft

310,320: Cam P: intake / exhaust side passage

The present invention relates to a valve train system of a vehicle, and more particularly, to a valve train system of a vehicle having an improved structure to reduce the flow resistance of the fluid due to opening and closing the valve and to compact the volume. will be.

In general, a four-cycle engine for vehicles consisting of intake, compression, explosion, and exhaust stroke opens the intake valve in the stroke to intake the mixer into the combustion chamber, closes the intake valve and exhaust valve in the compression and explosive stroke, and exhaust valve in the exhaust stroke. Has a valve train system to open the exhaust gas.

Such opening and closing action of the valve is usually caused in conjunction with the rocker arm by a cam shaft that rotates once when the crank shaft rotates two times, so that the valve opening and closing time is constant regardless of the engine condition.

Therefore, a large output can be obtained in a specific speed range, but there is a problem that the output is degraded in a region faster or slower than the specific speed.

In addition, the conventional valve train has a problem that energy loss occurs in opening and closing the valve because a plurality of components are mutually elastically supported or frictional contact.

FIG. 5 is a side cross-sectional view showing a conventional valve train, in which the inlet and exhaust valves 2 and 3 are installed at the upper side of the combustion chamber 1, and the valve heads 4 and 5 are positioned in the combustion chamber 1, respectively. The valve stems 6 and 7 are subjected to downward force irrespective of the rocker arms 8 and 9.

The upper side is pressed against the retainers 12 and 13 by the springs 10 and 11 for raising the valve which descends with respect to the downward force mentioned above, and the lower side is installed in the body 14 in a floating posture.

The rocker arms 8 and 9 are provided so as to be able to oscillate around the hinge axis by cams 17 and 18 integrally formed on the cam shafts 15 and 16.

The valve train of such a structure has a problem that structural complexity is inevitable due to the camshafts 15 and 16, the cams 17 and 18, and the components associated with them, and the crank when opening and closing the valve. The driving force transmitted from the shaft to the valve stems 6 and 7 is lost due to a large number of friction elements, elastic forces, and the like, which causes a decrease in engine output.

In addition, since the valve is located in the combustion chamber, there is a structural drawback in that the air flow is resisted and the intake and exhaust flow rates are reduced accordingly.

In addition, due to the structural characteristics of the relatively long valve stem has a limitation on the length of the cylinder head, there was a problem that the weight and cost increase.

The present invention has been proposed in view of the above-mentioned problems, and an object thereof is to provide an intake / exhaust valve constituting the intake / exhaust valve train in a structure that does not include a valve stem. Since the space occupied by the valve stem can be reduced, the height of the cylinder head can be reduced, thereby providing a valve train system of a vehicle with an improved structure that allows the overall volume of the engine to be more compact. There is.

The present invention for achieving the above object is provided on the outer peripheral surface of one end of the first rotary shaft having a hollow is integrally provided with a first rotary body which is in contact with the cam during rotational movement of the cam shaft, the other end of the first rotary shaft A first open / close valve in which a semicircular first valve plate extends integrally on one side of the outer circumferential surface; A second rotary shaft penetratingly coupled to the hollow inside of the first on-off valve, a second rotary body integrally provided at an outer circumferential surface of one end of the second rotary shaft, and rotatable in contact with the cam during rotational movement of the cam shaft, and the second rotary shaft A second open / close valve having the other end of which is integrally coupled with the semicircular second valve plate; The outer circumferential surface of the first and second rotation shafts are wound around a plurality of circuits, and one end is integrally coupled to the first and second rotation bodies, and the other end is fixedly supported in the cylinder head. A first and a second spring member for imparting a restoring elastic force when the whole rotates; The first and second plates are positioned at the inlet of the combustion chamber side intake / exhaust passage so as to be interlocked individually according to the rotation of the first and second rotation shafts according to the driving of the cam to open and close the intake / exhaust passage. It is characterized in that configured to.

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In addition, the first and second valve plate of the present invention is characterized in that the opening and closing operation at the same time or at a time difference by the rotation generated when the plurality of cams in contact with the first and second rotating bodies according to the relative angle formed on the cam shaft. .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The valve train system of the vehicle according to the present invention will be described with reference to FIGS. 1 to 4, and the configuration thereof includes a first rotary shaft 110 having a hollow 110a and one end of the first rotary shaft 110. It is provided integrally and interlocked during the rotational movement of the cam 310, the first spring member 150 is coupled to one side to the outer circumference of the first end 120 and the other end of the first rotating shaft 110 having a restoring force A first opening / closing valve 100 having a semicircular first valve plate 130 extending;

A second rotary shaft 210 inserted into the hollow 110a of the first rotary shaft 110 so that relative rotation is coupled and coupled to a circular second valve plate 230 at one end thereof; and the second rotary shaft The other end of the 210 is provided to be interlocked during the rotational movement of the cam 320, the second spring member 250 is coupled to the second on-off valve 200 having a second rotating body 220 having a rotation restoring force It is rough.

In more detail, the thread 210a is inserted into the second valve plate 230 and fastened to an outer circumferential surface of the other end of the second rotating shaft 210 penetrating the hollow 110a of the first rotating shaft 110. It has a formed structure.

In addition, the first and second spring members 150 and 250 are installed by winding a plurality of outer circumferential surfaces of the first and second rotation shafts 110 and 210 so that one end thereof is the first and second rotation bodies 120 and 220. And the other end is fixedly supported at a predetermined portion in the cylinder head, and restoring elastic force when the first and second rotating bodies 120 and 220 rotate according to the driving of the cams 310 and 320. It is intended to impart, so-called torsion springs.

In addition, the first and second rotating bodies 120 and 220 may have a shape of approximately “6”, but may be integrally formed on the outer circumferential surface of the first and second rotating shafts 110 and 210 in directions opposite to each other. Has a structure.

The first valve plate 130 has a structure in which the other end of the first rotation shaft 110 is integrally extended toward the outside in a semicircular shape, and the second valve plate 230 corresponds to the first valve plate 130. It is a structure that is screwed with the other end of the second rotary shaft 210 in a structure that does not interfere with the outer peripheral surface of the other end of the first rotary shaft 110 in the shape.

That is, when the first rotation shaft 110 and the second rotation shaft 210 are coupled to each other, the first plate 130 and the second plate 230 form a single circle, and at this time, the first rotation shaft When the 110 is rotated, only the first plate 130 is rotated, and when the second rotation shaft 210 is rotated, only the second plate 230 is rotated.
In detail, the first and second plates 130 and 230 may be individually interlocked by the rotation of the first and second rotation shafts 110 and 210, as shown in FIG. It is pivoted to perform the opening and closing action on the combustion chamber side intake / exhaust side passage (P).

In addition, the first and second rotary bodies 120 and 220 are in contact with the cams 310 and 320 when the cam shaft 300 rotates, and are rotated by the maximum displacement of the cam head, thereby rotating the rotational force thereof. The first and second valve plates 130 and 230 have the function of individually transmitting through 110 and 210.
That is, the first and second plates 130 and 230 are respectively installed to be located at the inlet of the intake / exhaust side passage P, which communicates with the inside of the combustion chamber of the engine, respectively. 110 and 210 are also installed at the same position as the inlet of the intake / exhaust side passage P in the cylinder head.

Unexplained reference numeral "230a" represents a coupling hole that is formed on one side of the second valve plate 230 and the other end of the second rotation shaft 210 is screwed into the inner peripheral surface.

Referring to the operation of the present invention having such a structure is as follows.

In the valve train system of the present invention, the first and second open / close valves 100 and 200 are installed in the intake side passage P or the exhaust side passage P of the combustion chamber so that the cam shaft 300 rotates. In contact with the cam 310, 320 to perform the opening and closing operation of the valve independently.

As the first and second rotary bodies 120 and 220 respectively contacting the cams 310 and 320 are rotated by the maximum displacement of the cams 310 and 320, the first and second rotary shafts 110 and ( The rotational force is transmitted to 210, and the rotational force acts as a force for rotating the first and second valve plates 130 and 230.

At this time, according to the relative angle between the two cams 310, 320 integrally formed on the outer circumferential surface of the cam shaft 300 for interlocking the first and second rotating bodies 120, 220, as shown in Figure 4a Since the valve plates 130 and 230 are rotated at the same time or the first and second valve plates 130 and 230 can be adjusted to perform the opening and closing operation with a slight time difference, as shown in FIG. 4B, the intake or exhaust operation is performed. You can find and adjust the angle with optimum efficiency.

In addition, when only one of the first and second valve plates 130 and 230 is opened in the case where the cams 310 and 320 are opened and closed to have a parallax rather than being rotated at the same time by adjusting the relative angles of the cams 310 and 320 (here, the intake air In operation), a tumble flow is formed before new air sucked through the intake side passage from the intake port flows into the combustion chamber, thereby improving the flowability of the intake air, thereby further improving the filling efficiency of the intake air.

Meanwhile, after the first and second valve plates 130 and 230 are rotated to perform the intake and exhaust operations, the cams 310 and 320 are continuously rotated, and the first and second rotary bodies 120 and 220 are rotated. When the cams 310 and 320 pass through portions that are not in contact, the first and second rotating bodies 120 and 220 return to their original positions by the restoring force of the first and second spring members 150 and 250. Since the first and second valve plates 130 and 230 are closed.

Therefore, since the valve stem constituting the intake / exhaust valve is unnecessary as in the existing intake / exhaust valve train system, the entire height of the cylinder head can be reduced by the height occupied by the length of the valve stem, so that the cylinder The volume of the head can be made more compact. In addition, the space occupied by the engine inside the engine room can be reduced, thereby reducing design constraints on layout that can avoid interference with other components.
In addition, in the present invention, since the intake / exhaust valve constituting the intake / exhaust valve train system is composed of only the first and second plates 130 and 230 having a disc shape, the respective first and second plates 130 and 230 are provided. By opening and closing the air gap at a time difference, it is possible to induce a tumble flow which can improve the fluidity in the case of intake, thereby further improving the filling efficiency of the intake.

According to the present invention described above, the inlet / exhaust valve constituting the intake / exhaust valve train system is implemented as a disc-shaped plate having no valve stem, thereby increasing the height of the cylinder head by the volume occupied by the valve stem in the existing intake / exhaust valve. Since it is possible to reduce the compactness of the cylinder head, it is possible to reduce the total volume of the engine from this it is possible to minimize the space occupied by the engine in the engine room.
In addition, it is possible to reduce the weight of the engine according to the volume reduction of the cylinder head and thereby reduce the cost.

Claims (3)

The first time in contact with one cam 310 of the plurality of cams 310, 320 during the rotational movement of the cam shaft 300 on the outer peripheral surface of one end of the first rotating shaft 110 having a hollow (110a) A first opening / closing valve (100) integrally provided with an entire body and having a semicircular first valve plate (130) integrally formed on one side of an outer circumferential surface of the other end of the first rotating shaft (110); A second rotary shaft 210 inserted into the hollow 110a of the first on-off valve 100 and coupled to the first rotary shaft 110 so that relative rotation is possible, and one end of the second rotary shaft 210; It is integrally provided on the outer circumferential surface and the second rotary body 220 is provided integrally in contact with the other cam 320 during the rotational movement of the cam shaft 300, the other end of the second rotary shaft 210 A second opening / closing valve 200 having a semicircular second valve plate 230 formed in a circular shape together with the first plate 130 on one outer circumferential surface thereof; The outer circumferential surfaces of the first and second rotation shafts 110 and 210 are wound around a plurality of circuits, and one end is integrally coupled to the first and second rotation bodies 120 and 220, and the other end is fixedly supported in the cylinder head. A first and second spring members 150 and 250 which provide a restoring elastic force when the first and second rotary bodies 120 and 220 rotate according to the driving of the cams 310 and 320; The first and second plates 130 and 230 are positioned at the inlet of the combustion chamber side intake / exhaust passage P to rotate the first and second rotation shafts 110 and 210 according to the driving of the cam 310. The valve train system of the vehicle, characterized in that configured to perform the opening and closing action for the intake / exhaust passage (P) individually interlocked. delete The method of claim 1, When the first and second valve plates 130 and 230 come into contact with the first and second rotating bodies 120 and 220 according to the relative angles of the cams 310 and 320 formed on the camshaft 300. Valve train system of a vehicle, characterized in that the opening and closing operation at the same time or with a time difference by the rotation generated.

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