JPS6033314Y2 - Gas engine gas valve drive device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas valve drive device for a gas engine.

Conventionally, in a gas engine that uses combustible gas as fuel, in order to supply the gas fuel G into the intake port A in synchronization with the opening and closing of the intake valve B, as shown in FIG.
A system is adopted in which a dedicated cam D is provided as a gas engine on the intake/exhaust camshaft C, and the gas valve E is driven mechanically or hydraulically.

The intake valve B is opened and closed by an intake valve arm I that swings as a bushing rod H moves up and down based on the rotation of an intake cam F.

Reference numeral J designates an exhaust cam, and its rotation swings an exhaust valve arm (not shown) to open and close the exhaust valve.

However, when the main parts of the diesel engine are also used for the gas engine, there is a problem that the number of parts for the gas engine increases significantly, which increases the cost.

Therefore, the present invention was devised to solve the above-mentioned conventional problems, and by integrating the gas valve drive cam for gas fuel supply of gas engines with the intake valve arm, it can be used as a part that can also be used with diesel engines. The purpose is to increase the number of gas engine parts and reduce the number of gas engine parts.

That is, the present invention provides a gas engine having a swingable intake valve arm and a gas valve for supplying gas fuel. It is constructed by integrally forming a cam portion having a lift curve with a lift amount that enables lift in the opening/closing direction.

Embodiments of the present invention will be described below based on the drawings.

First, in the gas engine according to the embodiment of the present invention shown in FIGS. 1 and 2, the intake valve arm 3 is swung by the valve arm shaft 2 rotatably supported by the valve arm shaft support 1 shown in FIG. movably supported.

That is, the intake valve arm 3 has one end 3a thereof in FIG.
The bushing rod (not shown) in contact with the lower part of the cylinder swings up and down to lift an intake valve (not shown) attached to the intake port 5 in the cylinder head 4 at the lower part of the other end 3b. It has become.

Next, in an intake pipe 6 provided in communication with the intake port 5, a gas fuel supply device 8 having a built-in gas valve 7 for supplying gas fuel as shown by arrow G is provided at the upper part of the cylinder head 4. The gas fuel G is supplied from the inlet pipe 8a through the throttle valve 9 into the intake pipe 6 through the outlet pipe 8b.

Further, the gas valve 7 can close the passage of the gas fuel G by the spring force of the spring 10;
A part of the intake valve arm 3 is integrally formed with a cam portion having a lift curve 13 having a lift amount that enables the gas valve 7 to be lifted in the opening/closing direction by swinging. An interrod 12 having a roller 11 always in contact with the lift curve 13 is interposed between the rod end of the gas valve 7 and the lift curve 13 so as to be slidable in the H direction in the figure.

In the gas valve driving device of the present invention having the above configuration, the cam portion consisting of the lift curve 13 formed integrally with the intake valve arm 3 drives the gas valve 7 via the roller 11 and the interrod 12, and the gas valve 7 is Fuel G can flow into the intake pipe 6.

The gas fuel G that has passed through the gas valve 7 passes through the throttle valve 9, and the flow rate is adjusted by the throttle valve 9. The adjustment of the throttle valve 9 is performed by a cam 14 connected to a governor device (not shown). It is now carried out by

Also, the lift curve 13 is at an angle α concentric with the valve arm axis 2.
By combining the arc part, the lift, and the to part, the valve opening period of the gas valve 7 is shortened while synchronizing with the intake valve (not shown) installed in the intake port 5, and the gap between the intake valve and the exhaust gas is shortened. It is possible to prevent the gas fuel G from flowing out due to overlap between the valves.

Note that at the angle φ shown in FIG. 2, the lift of the gas valve 7 is zero.

In this embodiment, an interrod 12 with a roller 11 is interposed between the gas valve 7 and the cam portion formed integrally with the intake valve arm 3 and formed with a lift curve 13.
The roller 11 may be attached to the rod portion of the gas valve 7 and brought into direct contact with this cam portion.

As described above, the gas valve drive device of the present invention is used in a gas engine having a swingable intake valve arm and a gas valve for supplying gas fuel. Since the cam part is integrally formed with a lift curve having a lift amount that enables the gas valve to be lifted in the opening/closing direction by the movement of the gas valve, the gas engine using the gas valve driving device of the present invention can Unlike conventional gas engines, there is no need to provide a separate gas valve drive cam, which simplifies the structure of the gas valve drive device of the gas engine, making it possible for the gas engine to be used in combination with the diesel engine. It is possible to increase the number of parts and reduce the number of parts for the gas engine, and as a result, it is effective in reducing the cost of the engine.

Particularly, the present invention is characterized in that there is no need to provide a separate cam for driving the gas valve, and as a result, the gas valve driving device can be formed more compactly and the number of parts can be reduced.

Note that the present invention can be effectively applied to a gas engine having a gas valve for fuel supply.

[Brief explanation of drawings]

FIG. 1 is a plan view of a cross-section of the main part of a gas valve drive device for a gas engine according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along A-A in FIG.
FIG. 3 is a side sectional view of a conventional gas valve drive device for a gas engine. 2...Valve arm shaft, 3...Intake valve arm, 7.
...Gas valve, Gas fuel supply device, 1
2... Interrod, 13-... Lift curve, G... Gas fuel.

Claims (1)

[Scope of utility model registration request] In a gas engine having a swingable intake valve arm and a gas valve for supplying gas fuel, a part of the intake valve arm includes:
A gas valve drive device for a gas engine, which is integrally formed with a cam portion having a lift curve having a lift amount that enables the gas valve to be lifted in the opening/closing direction by its rocking.