KR950013324B1 - Shaft-type valve apparatus - Google Patents

Abstract

The valve device having a simplified structure with the suction/ exhaust valve shaft in an internal combustion engine, offers the light-weight structure and improves the fuel-efficiency. The device having a cylinder head(1) with the suction/ exhaust ports(2)(3), comprises the suction/ exhaust valve shaft holes(4)(5) extended from the both sides of the cylinder head and engaged with the respective suction/ exhaust valve shafts(6)(7); connection passage(8) near the suction port(2) for selectively connecting the port(2) according to the rotation of the shaft(6); connection passage(9) near the exhaust port(3) for selectively connecting the port(3) according to the rotation of the shaft(7).

Description

Shaft type intake and exhaust valve device

1 is a schematic plan view schematically showing a cylinder head of an internal combustion engine in which a shaft type intake and exhaust valve device according to the present invention is installed.

2 is a schematic view for clarifying the orientation of the inlet-side communication path and the exhaust port-side communication path according to the present invention, (a) is a cross-sectional view taken along line AA of FIG. 1, (b) is a cross-sectional view taken along line BB of FIG. (C) is sectional drawing of the CC line of FIG. 1, and (d) is sectional drawing of the DD line of FIG.

3 is a schematic diagram showing drive means for driving the intake and exhaust valve device of the present invention.

4 is a plan view showing the valve shaft.

5 is a schematic perspective view of a bearing for protecting a journal portion of each valve shaft of the present invention.

6 is a cross-sectional view showing each communication path in which a camper is formed.

7 is a sectional view showing each communication path in which a spiral groove is formed.

* Explanation of symbols for main parts of the drawings

1: cylinder head 2: inlet

3: exhaust port 4: intake valve shaft hole

5: exhaust valve 6: intake valve shaft

7: exhaust valve shaft 8: inlet side communication path

9: exhaust port side communication path 10, 11, 12: sprocket

17: Journal 18,19: annular groove

20: bearing

The present invention relates to an intake and exhaust valve device, and more particularly, to a shaft type intake and exhaust valve device of an internal combustion engine. Conventional intake and exhaust valve devices for use in internal combustion engines such as vehicles include a plurality of intake and exhaust poppet valves respectively installed at the intake and exhaust ports of the cylinder head connected to the intake and exhaust manifolds of the internal combustion engine. And an intake camshaft and an exhaust camshaft in which a plurality of cams are formed which act on the poppet valves to selectively open and close the intake poppet valves and the exhaust poppet valves. The intake camshaft and the exhaust camshaft are connected to the crankshaft, and rotate according to the rotation of the crankshaft to open and close the intake poppet valves and the exhaust poppet valves one by one to achieve continuous stroke of the cylinders of the internal combustion engine. Doing.

However, in the conventional train type suction and exhaust valve device, not only the structure of each poppet valve used is complicated, but also the valve seat is likely to be worn out and the case is severe when the valve seat collides with the valve surface during valve operation. There was a problem in terms of durability such as damage to the valve itself.

In addition, the conventional intake / exhaust valve device of the above-described structure is not only disadvantageous in terms of performance and fuel efficiency by increasing the weight of the entire engine because the weight is heavy, and the conventional poppet valve type is the engine oil in the combustion chamber during operation There was a problem such as inflow of harmful exhaust gas.

Accordingly, an object of the present invention is to provide a shaft type intake and exhaust valve device having a simple structure to solve the disadvantages of the conventional train intake and exhaust valve device as described above.

In addition, another object of the present invention is to provide a suction and exhaust valve device that can be lightened by simplifying the structure and can improve the fuel economy and reduce the production cost.

In another aspect, the present invention to provide an intake, exhaust valve device that can reduce the harmful emissions by minimizing the oil in the combustion chamber by the rotary shaft lubrication method.

This object of the present invention is an intake and exhaust valve apparatus of an internal combustion engine having a cylinder head in which inlet and exhaust ports for each cylinder are arranged at regular intervals in the longitudinal direction, respectively, on both side portions of the cylinder head. An intake valve shaft and an exhaust valve shaft hole rotatably received in an intake valve shaft hole and an exhaust valve shaft hole extending in the longitudinal direction over the entire length, the intake valve shaft hole and the exhaust valve shaft, and the intake valve shaft The cylinder heads extend radially in a state in which they are spaced in the longitudinal direction so as to be able to communicate with each of the intake ports of the cylinder head, and at the same time, they can be selectively communicated with the corresponding intake ports one by one according to the rotation of the intake valve shaft. The direction of extension is formed at different angles Extending in the radial direction while being arranged at intervals in the longitudinal direction so as to communicate with each other of the cylinder head on the inlet-side communication path and the exhaust valve shaft. It is achieved by providing a shaft-type intake and exhaust valve device, characterized in that it comprises an exhaust port side communication path is formed so that the extension direction is different by a predetermined angle when viewed from the side.

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

1 and 2 are a plan view and a partial cross-sectional view schematically showing a part of an internal combustion engine in which an intake and exhaust valve device according to the present invention is installed, wherein the internal combustion engine is a four-stroke engine having four cylinders. However, the present invention is not limited thereto.

The intake / exhaust valve device of the present invention has a length over its entire length on each side of the cylinder head 1, in which the inlet port 2 and the exhaust port 3 for each cylinder are arranged at regular intervals in the longitudinal direction, respectively. And an intake valve shaft 6 and an exhaust valve shaft 7 rotatably received in the intake valve shaft hole 4 and the exhaust valve shaft hole 5 extending in the direction.

The intake valve shaft 6 is provided with communication paths 8 extending radially in a state arranged at intervals in the longitudinal direction corresponding to each intake port 2 of the cylinder head 1 so as to be able to communicate with them, respectively. The communication paths 8 have a predetermined angle (45 ° in this embodiment) when viewed from the side to selectively communicate with the corresponding intake port 2 one by one according to the rotation of the intake valve shaft 6. It is formed differently. Similarly, the exhaust valve shaft 7 also has a communication path 9 extending radially in a state arranged at intervals in the longitudinal direction corresponding to each exhaust port 3 of the cylinder head 1 so as to be able to communicate with them, respectively. ), These communication paths 9 also have a certain angle of extension in a lateral view such that the exhaust valve shaft 6 can selectively communicate with the corresponding exhaust port 3 one by one as it rotates. In the case of the example, the difference is formed by 45 °).

2 shows the orientation of the communication paths 8 of the intake valve shaft 6 and the communication paths 9 of the exhaust valve shaft 7, in which the combustion chamber explosion order is the first cylinder C1, the third. In the case of the cylinder C3, the fourth cylinder C4, and the second cylinder C2, the communication 8, 9 is carried out in the same order as that of the cylinder C3, the fourth cylinder C4, and the second cylinder C2. Orientation is made to be different by 45 degrees in the same direction as the rotation direction of the).

2 shows a cross section at a specific point in time, where the first cylinder C1 is in an intake stroke in which only the inlet port 2 is opened, and the second cylinder C2 is discharged in which only the exhaust port 3 is opened. In the stroke state, the third cylinder C3 is in a compressed stroke state in which both the inlet port 2 and the exhaust port 3 are closed, and the fourth cylinder C4 has both the inlet port 2 and the exhaust port 3. Demonstrates a closed explosive stroke.

The rotation of the intake valve shaft 6 and the exhaust valve shaft 7 is made by the rotational force of the crankshaft (not shown), and for this purpose, the intake valve shaft 6 and the exhaust valve shaft are shown in FIG. The sprockets 10 and 11 are respectively mounted at one end of the sprocket 10, and the sprockets 10 and 11 are connected to the sprockets 12 mounted on the crankshaft by the timing belt 13, respectively. have.

According to this configuration, when the crankshaft side sprocket 12 rotates due to the rotation of the crankshaft, the intake and exhaust valve shaft side sprockets 10, 11 rotate simultaneously, and the intake valve shaft 6 is rotated by this rotation. ) And the exhaust valve shaft 7 rotate, and each of the communication paths 8 and 9 continuously communicates with the corresponding intake port 2 and the exhaust port 3 one by one to intake and exhaust.

In the case of the embodiment described above, the rotation ratio of each of the valve shafts 6 and 7 with respect to the crankshaft is 1: 4.

In FIG. 1, reference numeral 14 denotes a crank angle sensor for detecting a crank angle, and is provided at the other end of the intake valve shaft. Each valve shaft 6, 7 has journal portions 17 on both sides of each communication path 8, 9, as shown in FIG. 4, and each of the journal portions 17 Annular grooves 18 and 19 are formed between the communication paths for installing the compression ring (not shown) and the oil ring (not shown), so that it is possible to provide airtightness and oil seal of the combustion chamber ( In this regard, the mercury of the valve shafts 6 and 7 is the same, so only the configuration of the exhaust valve shaft 7 is shown in FIG. 4). In addition, in order to prevent abrasion of the journal portion 17 due to the high-speed rotation of the valve shafts 6 and 7, inside the valve shaft holes 4 and 5, as shown in FIG. At the same time that the protective bearing 20 is mounted, the oil passage 21 is formed in the bearing 20 to perform lubrication and cooling.

According to the present invention, a chamfer 22 is formed at both ends of each communication path 8 and 9, as shown in FIG. This can be increased. In addition, as shown in FIG. 7, a plurality of spiral grooves 23 may be formed on the inner surfaces of the communication paths 8 and 9, in which case the vortex effect is increased. The number and the groove width of the helical grooves 23 can be appropriately determined depending on the engine used. As described above, the present invention provides a shaft type intake / exhaust valve device composed of an intake valve shaft and an exhaust valve shaft with a simple structure, and thus, the entire internal combustion engine can be reduced in weight, thereby improving fuel economy and manufacturing cost. The advantage is that it can take less.

Claims (6)

In the intake and exhaust valve apparatus of an internal combustion engine having a cylinder head (1) in which the inlet port (2) and the exhaust port (3) for each cylinder are arranged at regular intervals in the longitudinal direction, the cylinder head (1) The intake valve shaft hole 4 and the exhaust valve shaft hole 5 each of which extends in the longitudinal direction over its full length at both sides of the intake valve shaft hole 4 and the exhaust valve shaft hole 5, respectively. The intake valve shaft 6 and the exhaust valve shaft 7 which are rotatably received, and the intake valve shaft 6 corresponding to each intake port 2 of the cylinder head 1 in a longitudinal direction so as to be in communication with each other; Are extended at radial intervals so as to extend in the radial direction at the same time so as to be selectively communicated with the corresponding intake port 2 one by one according to the rotation of the intake valve shaft 6.The radius of the air inlet-side communication path 8 and the exhaust valve shaft 7 are arranged at intervals in the longitudinal direction to correspond to each of the exhaust ports 3 of the cylinder head 1 so as to communicate with them. The exhaust port side communication path (9) extending in a direction and extending in a predetermined angle when viewed from the side to selectively communicate with the corresponding exhaust port (3) one by one according to the rotation of the exhaust valve shaft (6). Shaft type intake, exhaust valve device characterized in that it comprises a). 2. The sprockets 10 and 11 connected to the sprocket 12 connected to the crankshaft of the internal combustion engine are mounted at one end of the intake valve shaft 6 and one end of the exhaust valve shaft 7, respectively. Shaft type intake, exhaust valve device characterized in that. The method of claim 1, wherein each of the intake valve shaft (6) and the exhaust valve shaft (7) is provided with a compression ring and an oil ring between the journal portion (17) formed on both sides of each communication path and each communication path. Shaft type intake and exhaust valve device, characterized in that the annular groove (18, 19) is formed. 2. The bearings (20) according to claim 1, wherein a bearing (20) for protecting each journal portion of the intake valve shaft (6) and the exhaust valve shaft (7) is mounted in each valve shaft hole (4, 5). The shaft type intake and exhaust valve device, characterized in that the oil passage 21 is formed in (20). 2. A shaft type intake and exhaust valve device according to claim 1, wherein a chamfer is formed at both ends of each communication path. 2. A shaft type intake and exhaust valve device according to claim 1, wherein a plurality of spiral grooves (23) are formed on an inner surface of each communication path (8,9).