JPS6036776Y2 - gas engine gas fuel supply device - Google Patents

Description

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

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

The intake valve B is opened and closed by an intake valve arm (2) that swings as a bushing rod H moves up and down based on the rotation of the 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 compactly housing the gas fuel supply device of a gas engine in the valve arm, the number of parts that can be used in conjunction with a diesel engine is increased, and the gas The purpose is to reduce the number of engine parts.

That is, in the present invention, the intake valve arm 1 and the exhaust valve arm 2 are connected to the valve arm shaft 3.
In a gas engine supported swingably by a gas engine, a gas fuel supply passage 5a is provided at the axis of the valve arm shaft 3, one end of which extends to the end of the valve arm shaft 3 on the exhaust valve arm 2 side. A swinging valve 6 connected to a gas fuel supply source, the other end of which fits into the outer periphery of the valve arm shaft 3 on the intake valve arm 1 side, and is supported so as to be swingable together with the intake valve arm 1. An intake valve is formed to open into a semi-cylindrical internal space formed at the fitting portion with the valve arm shaft 3, and further has one end opened into the internal space and the other end provided with an intake port 11 therein. A gas fuel supply passage 5b communicating with the port 9 is divided and provided in the extending direction of the gas fuel supply passage 5a, and the opening of the gas fuel supply passage 5b to the internal space can be opened and closed by swinging the swing valve 6. It is constructed by:

Embodiments of the present invention will be described below with reference to the drawings.

First, in the gas fuel supply device for a gas engine according to the embodiment of the present invention shown in FIGS. 1, 2, and 3, the intake valve arm 1
The exhaust valve arm 2 is swingably supported by a valve arm shaft 3, and the valve arm shaft 3 is rotatably supported by a valve arm shaft support 4.

As explained in the conventional example shown in FIG. 5, the intake valve arm 1 and the exhaust valve arm 2 swing due to the vertical movement of the bushing rod based on the rotation of the intake cam and the exhaust cam, and the intake valve arm 1 and the exhaust valve arm 2 swing. It is designed to open and close.

Next, in the valve arm shaft 3, a gas fuel supply path 5a that supplies gas fuel via the joint 12 from the end on the exhaust side;
5b is formed at the center of the valve arm shaft 3, and the gas fuel supply passage 5a is connected to the half of the swinging valve 6 which is rotatably supported by the valve arm shaft 3 at the end on the intake valve arm 1 side. It opens into a cylindrical internal space, and the gas fuel G that has passed through the swing valve 6 returns to the gas fuel supply path 5b formed in the valve arm shaft 3.
It returns to its original position and is introduced from its end via the throttle valve 7 shown in FIG.

This throttle valve 7 is controlled by a governor device (not shown) via a cam 9, making it possible to control the load.

Since the swinging valve 6 is fixed to the intake valve arm 1 by the port 10, the swinging valve 6 is attached to the valve arm shaft 3 along with the intake valve arm 1.
When the swinging valve 6 swings together with the swinging of the intake valve arm 1, the swinging valve 6 moves relative to the valve arm shaft 3 in the circumferential direction. Swing valve 6 shown in Figure 2
The open state of the gas fuel G and the gas fuel G shown in FIG.
The closed state of the intake valve 11 is repeated in synchronization with the intake valve 11.

That is, the opening of the gas fuel supply passage 5b and the oscillating valve are connected so that the gas fuel supply passage 5b is cut off from the internal space of the oscillating valve 6 only when the intake and exhaust air overlap (the state shown in FIG. 4). By determining and setting the connection position of the valve 6 with the semi-cylindrical internal space, the swing valve 6 is repeatedly opened and closed in synchronization with the intake valve 11.

As described above, the gas fuel supply device of the present invention is used in a gas engine in which the intake valve arm 1 and the exhaust valve arm 2 are swingably supported by the valve arm shaft 3. One end of the fuel supply passage 5a extends to the end of the valve arm shaft 3 on the exhaust valve arm 2 side to communicate with the gas fuel supply source, and the other end extends to the end of the valve arm shaft 3 on the intake valve arm 1 side. The intake valve arm 1 is fitted to the outer periphery and
The valve arm shaft 3 of the swinging valve 6 is swingably supported together with the valve arm shaft 3 of the swinging valve 6.
It is formed so as to open into a semi-cylindrical internal space formed at the fitting part with the internal space, and further, one end opens into the internal space and the other end communicates with an intake port 9 having an intake valve 11 installed therein. The gas fuel supply passage 5b is divided and provided in the extending direction of the gas fuel supply passage 5a, and the opening of the gas fuel supply passage 5b to the internal space can be opened and closed by swinging the swing valve 6. Therefore, in a gas engine to which the gas fuel supply device of the present invention is applied, the gas fuel supply device is compactly installed in the valve arm of the engine, and the number of parts that can be used in common with the diesel engine is increased. The number of parts for the gas engine can be reduced, and as a result, it is effective in reducing the cost of the engine.

In particular, with the gas fuel supply device of the present invention, there is no need to provide a gas valve to open and close the gas fuel, and the role of the gas valve is performed by a swing valve installed on the valve arm shaft, which allows the engine to be made more compact. can do.

The present invention can be effectively applied mainly to gas engines in which the intake valve arm is swingably supported by the valve arm shaft.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional plan view of the main part of a gas fuel supply system for a gas engine according to an embodiment of the present invention, and Fig. 2 is a side cross-section in the I-I direction showing the swing valve in Fig. 1 in an open state. Figure 3 is the first
Fig. 4 is a side sectional view in the I-■ direction showing the closed state of the swing valve in Fig. 1; Fig. 5 is a conventional gas fuel supply system for a gas engine. FIG. 1...Intake valve arm, 2...Exhaust valve arm, 3
... Valve arm shaft, 5a, 5b ... Gas fuel supply path, 6 ... Rocking valve, 10 ... Bolt, 11 ...・Intake valve, G...Gas fuel.

Claims (1)

[Scope of utility model registration request] In a gas engine in which an intake valve arm 1 and an exhaust valve arm 2 are swingably supported by a valve arm shaft 3, a gas fuel supply passage 5a is connected to the axis of the valve arm shaft 3, and one end thereof is connected to the valve arm shaft 3. 3 to the end on the exhaust valve arm 2 side and connected to the gas fuel supply source, and the other end fits into the outer periphery of the valve arm shaft 3 on the intake valve arm 1 side, and the other end is connected to the intake valve arm 1 side. The swing valve 6, which is swingably supported together, is formed to open into a semi-cylindrical internal space formed at the fitting part with the valve arm shaft 3, and further has one end opened into the internal space. An intake port 9 that is open and has an intake valve 11 inside at the other end.
The gas fuel supply path 5b connected to the gas fuel supply path 5
The gas fuel supply path 5b is divided and provided in the extending direction of a.
A gas fuel supply device for a gas engine in which an opening to the internal space of the gas engine can be opened and closed by swinging a swinging valve 6.