JP3333808B2 - Gas fueled engine with pressure regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas fuel engine using a mechanical governor.

[0002]

2. Description of the Related Art Conventionally, various engines for working machines using liquid gas fuel such as LPG have been proposed. FIG. 5 is a schematic diagram showing the configuration of the general-purpose gas fuel engine.
In general, this kind of general-purpose gas fuel engine employs a mechanical governor as a speed adjusting mechanism in order to manufacture the engine at low cost. As shown in FIG. 5, a governor lever 100 is attached to a mechanical governor 97 by a pivot 104.
With a balance force between the tension of the governor spring 99 that urges the governor lever 100 toward the fuel increasing side and the governor force 98 that urges the governor lever 100 toward the fuel decreasing side,
There is a configuration in which the throttle valve 101 of the mixer device 94 is operated.

[0005] In the gas fuel engine 90 shown in FIG. 5 , a gas fuel tank 91 as a gas fuel supply source is connected to an intake passage of the gas fuel engine 90 via a pressure regulator 92, a gas fuel supply pipe 93, and a mixer 94. 95 and the gas fuel from the pressure regulator 92 and the air cleaner 1.
The mixing unit 94 mixes air from the engine 02 and supplies it to the combustion chamber 105 of the engine. As the pressure adjusting device 92, a so-called zero pressure adjusting device 92 that supplies the gas fuel in the pressure adjusting device 92 to the mixer device 94 only by the negative pressure of the intake passage 95 is known.

The zero-pressure adjusting device 92 includes a negative-pressure fuel lock mechanism 96 for preventing gas fuel from being supplied to the mixer 94 when the negative pressure in the intake passage 95 is lower than a predetermined value. There are things. The negative pressure fuel lock mechanism 96 is provided with a shield valve (not shown) linked to the value of the negative pressure of the intake passage 95, and the zero pressure adjusting device is provided by the shield valve unless the negative pressure of the intake passage 95 becomes a predetermined value or more. The supply of the gaseous fuel from the engine 92 is shut off. That is, when the engine is not driven, the pressure in the intake passage 95 is equal to the atmospheric pressure, so that the gas fuel is not supplied to the mixer device 94 by the shut-off valve before the engine is started. . In addition,
In FIG. 5, reference numeral 103 denotes a speed adjusting lever, and the speed adjusting lever 103 is connected to the governor lever 100 by a governor spring 99.

[0005]

However, in the case of a general-purpose gas fuel engine employing the above-mentioned mechanical governor 97, the governor force 98 is provided before the engine is started.
Does not work, the governor spring 99 pulls the governor lever 100 toward the fuel increasing side, and the throttle valve 101 linked to the governor lever 100 is normally fully opened. As described above, the negative pressure fuel lock mechanism 96 is configured so that the gas fuel is not supplied to the mixer device 94 unless the negative pressure of the intake passage 95 becomes larger than a predetermined value. When the opening of the valve 101 is large (for example, when it is fully opened by the governor spring 99), the negative pressure fuel lock mechanism 96 is not released because the intake negative pressure does not increase beyond a predetermined value, and the mixer 94 Is not supplied with gas fuel, and the engine cannot be started.

Conventionally, to start the engine in such a gas fuel engine 90, the throttle valve 101 is manually operated to adjust the opening so that the intake negative pressure becomes a predetermined value or more. Assuming that the angle of the valve 101 in the fully closed state is 0 ° and the angle of the fully open state is 90 °, the opening of the throttle valve 101 is set to 10 ° to 15 ° to start the engine. In this case, the starter switch must be operated with one hand while operating the throttle valve 101 with the other hand, and the start-up operation becomes complicated, and if the opening of the throttle valve 101 is not properly adjusted, the engine must be operated properly. Since the engine cannot be started, the operability of the engine is reduced.

An object of the present invention, the gaseous fuel engine using pressure regulating device provided with a negative pressure fuel locking mechanism is to allow the starting of the engine easily and reliably. Another object of the present invention is not affected by the opening of the throttle valve of the mixer apparatus, to provide a gas fuel engine that allows the starting of the engine.

[0008]

In order to solve the above-mentioned problems, the invention of claim 1 is directed to an air passage 4 through a mixer device 3 as shown in FIG. 3 and FIG. The gas fuel and the air are mixed in the mixer device 3 to form an air-fuel mixture, and the air-fuel mixture is supplied to the combustion chamber 5. Is provided with a throttle valve 6, the throttle valve 6 is connected to a governor lever 8, and the governor lever 8 is connected to and driven by a speed adjusting lever 10 via a governor spring 9. The governor lever 8 is A centrifugal mechanical governor 17 configured to adjust and control the opening of the throttle valve 6 in balance with the tension and the governor force 11 generated based on the centrifugal force of the governor weight. In the adopted gas engine, the gas fuel of the gas fuel storage means 12 is guided to the pressure adjusting device 14, and the gas fuel which has been adjusted to substantially the atmospheric pressure by the pressure adjusting device 14 is guided to the gas fuel supply section 16 of the mixer device 3. The pressure adjusting device 14 is configured to evaporate the liquid gas fuel and adjust the pressure to a primary pressure. The primary pressure chamber 21 communicates with the primary pressure chamber 21 through a communication hole 27.
Pressure chamber 22 that adjusts the pressure adjusted by the pressure to approximately the atmospheric pressure, and a negative pressure that shuts off gas fuel from being supplied to the mixer device 3 when the negative pressure in the intake passage 4 is smaller than a predetermined value. And a fuel lock means 23,
In the primary pressure chamber 21, there is provided pressure adjusting means 30 for adjusting the pressure of the primary pressure chamber 21 by adjusting the inflow amount of the liquid gas fuel into the suction port 28 to which the gas pipe 13 from the gas fuel storage tank 12 communicates. The pressure in the secondary pressure chamber 22 is adjusted by adjusting the amount of gas fuel flowing from the primary pressure chamber 21 into the secondary pressure chamber 22 through the communication hole 27 in the secondary pressure chamber 22. A bypass passage 61 that has a pressure means 40 and communicates with the primary pressure chamber 21 and the secondary pressure chamber 22 separately from the communication hole 27; After that, control means 63, 7 for controlling the bypass passage 61 to a cutoff state.
Setting the 1,72,

[0009]

[0010] The control means 71, 72 is the gas fuel storage means 1
2 and a valve means 72 provided between the pressure adjusting device 14,
The booster valve 71 is provided with a valve element 64 for opening and closing the bypass passage 61. The starter switch 67 functions so that the valve means 72 cuts off the supply of gaseous fuel when the starter switch 67 is in the stop position. Is in the starting position and the operating position, the valve means 72 functions to supply gas fuel, while the boost actuating valve 71
Functions to shut off the bypass passage 61 when the negative pressure in the intake passage 4 exceeds the set pressure value, and to communicate with the bypass passage 61 when the negative pressure in the intake passage 4 does not exceed the set pressure value. It is characterized by functioning.

[0011]

According to the first aspect of the present invention, the control means controls the bypass passage 61 to be in a communicating state at the time of engine start operation, so that the negative pressure in the intake passage 4 is smaller than a predetermined value, and the negative pressure fuel lock is performed. The gas fuel flows from the primary pressure chamber 21 to the secondary pressure chamber 22 from the bypass passage 61 even when the engine is started, in which the gas fuel in the primary pressure chamber 21 does not flow to the secondary pressure chamber 22 via the communication hole 27 by the means 23. Therefore, the engine can be started easily. further,
After the engine is started, the control means controls the bypass passage 61 to be in the cut-off state. Therefore, after the engine is started, the normal operation by the fuel supply from the communication hole 27 can be performed.

[0012]

A control means 71, 72 is provided with a valve means 72 provided between the fuel storage means 12 and the pressure adjusting device 14.
And a boost actuating valve 71 having a valve body 64 for opening and closing the bypass passage 61. The starter switch 67 functions to shut off gas fuel supply when the starter switch 67 is in the stop position. Since the valve means 72 functions to supply gas fuel when the switch 67 is in the starting position and the operating position, the gas fuel is supplied to the pressure adjusting device 14 only at the time of engine start and engine operation. You can make it. Further, the boost operation valve 71 functions to communicate with the bypass passage 61 when the negative pressure in the intake passage 4 does not exceed the set pressure value. A predetermined amount of fuel can be supplied from the passage 61. Further, during the operation of the engine after the engine is started, the negative pressure in the intake passage 4 exceeds the set pressure value. Therefore, the boost operating valve 71 functions so as to shut off the bypass passage 61, and enters a normal fuel supply state. be able to.

[0014]

As described in detail above, the invention of claim 1 has the following unique effects (a) to (d) . (A) Even in a gas fuel engine using a pressure adjusting device provided with a negative pressure fuel lock means, even when the engine is started with a small negative pressure in the intake passage, the gas fuel is transferred from the primary pressure chamber to the secondary pressure chamber by the bypass passage. Since the engine is supplied, the engine can be started easily and reliably, and the normal operation state can be maintained after the engine is started. (B) The mechanical governor can start the engine without being affected by the opening of the throttle valve even if the opening of the throttle valve of the mixer device is large during the engine start operation. (C) Since the bypass passage is provided in the pressure adjusting device, it is lightweight and compact.

(D) The control means is provided with a valve means provided between the fuel storage tank and the pressure adjusting device, so that gas fuel is not supplied to the fuel storage tank and the pressure adjusting device when the starter switch is in the stop position. As a result, unexpected gas leakage can be prevented, and since the boost actuating valve is used to shut off the bypass passage after the engine is started, there is a unique effect that no new power means such as a solenoid is required. .

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a gas fuel engine according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part near a bypass passage. The gas fuel engine 1 uses the air from the air cleaner 2
, And the mixture is mixed with the gaseous fuel and air in the mixer 3 to form an air-fuel mixture, and the air-fuel mixture is supplied to the combustion chamber 5. A throttle valve 6 is provided at a position of the intake passage 4 on the combustion chamber 5 side of the mixer device 3 so as to adjust the amount of air-fuel mixture. The throttle valve 6 is connected to a governor lever 8 by a connecting rod 7.
The governor lever 8 is configured to be connected and driven to a speed adjusting lever 10 via a governor spring 9.
The governor lever 8 is pivotally supported by a pivot shaft 18 and is provided with a balance between a tension of a governor spring 9 biasing the fuel increasing side and a governor force 11 generated based on a centrifugal force of a governor weight (not shown). 6 is adjusted. Instead of an electronically controlled governor,
By employing the mechanical governor 17 as described above, the unit price of the engine can be reduced.

Further, the liquid gas fuel from the gas fuel storage tank 12 is led to a pressure adjusting device 14 by a gas pipe 13,
The gas fuel whose pressure has been adjusted to substantially the atmospheric pressure by the pressure adjusting device 14 is guided to the gas fuel supply nozzle 16 of the mixer device 3 by the gas pipe 15. At a predetermined position of the intake passage 4 closer to the combustion chamber 5 than the throttle valve 6, an intake negative pressure communication passage 51 communicating with a boost lock chamber 48 of the pressure regulator 14 described later is provided, and the negative pressure fuel lock mechanism 23 operates. It is configured to be able to. The pressure adjusting device 14 includes a device base 20, a primary pressure chamber 21 that vaporizes the liquid gas fuel and adjusts the pressure to a primary pressure, and a secondary pressure that adjusts the pressure adjusted by the primary pressure chamber 21 to a substantially atmospheric pressure. The chamber 22, a negative pressure fuel lock mechanism 23 that shuts off gas fuel from being supplied to the mixer device 3 when the negative pressure of the intake passage 4 is smaller than a predetermined value, and an amount of fuel supplied during idling. An idling fuel adjusting mechanism 24, a hot water jacket 25 formed on the device base 20 so as to promote vaporization of the primary pressure chamber 21, and a gas fuel of the primary pressure chamber 21 to the secondary pressure chamber 22 only when the engine is started. And a bypass passage forming portion 26 that allows the flow to flow.

Each of the primary pressure chamber 21 and the secondary pressure chamber 22 is formed by providing two chambers in the apparatus base 20, and the primary pressure chamber 21 and the secondary pressure chamber 22 communicate with each other through a communication hole 27. Have been. Further, a negative pressure fuel lock mechanism 23 is provided between the primary pressure chamber 21 and the secondary pressure chamber 22. In the primary pressure chamber 21, the gas fuel storage tank 1
The suction port 28 to which the gas pipe 13 from the second 2 communicates is connected to the valve body 29
A first lever 30 that adjusts the inflow amount of the liquid gas fuel by contacting with a pressure, a diaphragm 31 that forms the primary pressure chamber 21 and adjusts the pressure, and a diaphragm 3
A pressing spring 32 for urging the first lever 30 toward the secondary pressure chamber 22 through the first lever 30 and a valve body 29 of the first lever 30
Has an urging spring 34 for pressing the contact portion 33 of the first lever 30 so as to press against the suction port 28. The first lever 30 is swingably supported by a fulcrum shaft 35 attached to the base body 20 of the pressure adjusting device 14.
The one end on the 8 side is a valve body portion 29 and the other end is a contact portion 33. The pressing spring 32 has an adjusting screw 3 for adjusting the spring force of the pressing spring 32.
7 are provided.

When the amount of liquid fuel entering the primary pressure chamber 21 through the suction port 28 decreases, the pressure in the primary pressure chamber 21 defined by the diaphragm 31 decreases, and the pressure determined by the pressing spring 32 and the diaphragm 31 decreases. The pressure pushes the contact portion 33 of the first lever 30 toward the secondary pressure chamber 22 (left side). As a result, the gap between the valve body 29 and the suction port 28 widens, and the amount of liquid fuel flowing into the primary pressure chamber 21. Work in the direction of increasing pressure. When the pressure in the primary pressure chamber 21 exceeds a certain value, the diaphragm 31 expands,
The contact portion 33 is pushed rightward by the force of the urging spring 34, the valve body 29 closes the gap between the suction ports 28, and operates in a direction to suppress the inflow of liquid fuel. By such an operation, the pressure of the gas fuel in the primary pressure chamber 21 is controlled to a substantially constant range (200 to 300 mmAq).

The primary pressure chamber 21 and the secondary pressure chamber 22 communicate with each other through a communication hole 27, and the communication hole 27 is pressed by the valve body 41 of the second lever 40 so that the primary pressure chamber 21 is separated from the primary pressure chamber 21. The amount of gas fuel flowing into the secondary pressure chamber 22 is adjusted. The second lever 40 is a fulcrum shaft 4
2, one end on the side of the communication hole 27 is a valve body 41, and two contact portions are provided on the other end. At a position near the fulcrum shaft 42 on the other end side of the second lever 40, a pressing spring 43 that presses the valve body 41 of the second lever 40 against the communication hole 27 by rotating the second lever 40 is provided. ing. Also, the second
A boost contact portion 44 is formed at the other end of the lever 40 at the other end. Further, an aisle contact portion 46 is formed near the inside on the other end side of the second lever 40, and an idle adjustment protrusion 45 described below contacts the idler contact portion 46.

The negative pressure fuel lock mechanism 23 is connected to the primary pressure chamber 21.
Lock chamber 4 provided between the pressure chamber and the secondary pressure chamber 22
8, the diaphragm 49 is configured to urge the boost contact portion 44 toward the secondary pressure chamber 22 (left side) by the boost spring 50, and the boost lock chamber 48 is suctioned into the intake passage 4. It is configured to be connected via a pressure communication pipe 51. If the negative pressure in the intake passage 4 does not exceed a predetermined value, the boost contact portion 44 is pushed up to the left by the pressing force of the boost spring 50, and the valve body portion 41 of the second lever 40 is strongly pressed against the communication hole 27. Then, by preventing the gas fuel from flowing into the secondary pressure chamber 22, the supply of the fuel is shut off (locked).

On the other hand, when the negative pressure in the intake passage 4 exceeds a predetermined value and increases, the negative pressure in the boost lock chamber 48 increases through the intake negative pressure communication pipe 51, and the boost spring 5
The diaphragm 49 is opposed to the primary pressure chamber 21 against the pressing force of 0.
It is pulled to the side (right side), releasing the pressure on the boost abutment 44 and allowing gaseous fuel to flow into the secondary pressure chamber 22. The idling fuel adjustment mechanism 24 has an idle adjustment lever 53 swingably supported by a support shaft 52 provided on the left side wall of the device base 20, and the idle adjustment lever 53 is engaged with an idle adjustment screw 54. The screw-side contact portion 55 and the idle adjustment protrusion 45 are connected to the primary pressure chamber 2.
And an engagement portion 57 having a spring 56 that urges one side (right side). For example, the idle adjustment lever 53
Is moved downward, against the support spring 59,
When the screw-side contact portion 55 moves as indicated by an arrow 86 and the idle adjustment lever 53 pivots about the support shaft 52 as a lever, the pressing force of the spring 56 of the engagement portion 57 increases.

Due to the increase in the spring force, the idle adjustment projection 45 fixed to the center of the diaphragm 58 of the secondary pressure chamber 22 moves to the primary pressure chamber 21 side. The rightward movement of the idle adjustment projection 45 causes the second lever 4 to move.
It can be adjusted so that the pressure contact force of the zero valve body portion 41 becomes weak and the gas fuel supply amount during idling operation increases. In addition,
The diaphragm 58 of the secondary pressure chamber 22 expands and contracts according to the magnitude of the pressure of the gaseous fuel exiting from the insertion hole 27, thereby supplying the same to the mixer device 3 regardless of the magnitude of the pressure of the gaseous fuel exiting the insertion hole 27. It is provided to make the pressure of the gas fuel substantially equal to the atmospheric pressure.

The primary pressure chamber 21
Of the device base 2 separately from the communication hole 27 between the
0, a bypass passage 61 communicating the primary pressure chamber 21 and the secondary pressure chamber 22, a starting jet 62 provided in a part of the bypass passage 61, and a starting solenoid 63 having a valve body 64. It is composed of By operating the valve body 64, the starting solenoid 63 can control a state in which the valve is closed by pressing against the starting jet 62 and a state in which a gap is formed between the starting jet 62 and the valve body 64 and the valve is opened. Like that. The control of the valve body 64 is performed in conjunction with the operation of the switch position of the starter switch 67 as described later. The hot water jacket 66 is formed by forming a water passage in the device base 20 around the primary pressure chamber 21, and is for satisfactorily vaporizing the liquid gas fuel flowing into the primary pressure chamber 21.

The operation of the gas fuel engine having the above configuration will be described. When the starter switch 67 is turned to the start position 68 at the time of starting the engine, the drive switch 65 of the starting solenoid 63 is short-circuited, and the valve body 64 of the starting solenoid 63 which is always closed is opened. In this state, the starting gas flows from the primary pressure chamber 21 to the secondary pressure chamber 22 through the bypass passage 61 irrespective of the operation of the valve body 41 of the second lever 40 that is in pressure contact with the communication hole 27, and Is supplied with gaseous fuel. At the time of starting the engine, since the negative pressure in the intake passage 4 is not high, the negative pressure fuel lock mechanism 23 operates, and the supply of fuel from the primary pressure chamber 21 to the secondary pressure chamber 22 is shut off by the second lever 40. . The throttle valve 6 is fully opened due to the tension of the governor spring 9.

When the engine is started by the gas fuel supplied from the bypass passage 61, the governor force 11 acts, and the opening of the throttle valve 6 is controlled so that the governor force 11 and the governor spring 9 can be balanced. , The negative pressure fuel lock mechanism 23 is released, and the gas fuel is supplied from the communication hole 27. Also,
In a state where the starter switch 67 is returned from the start 68 to the operation position 69, the starting solenoid 63 is protruded, the starting jet 62 is closed, and combustion is performed by the gas fuel from the communication hole 27. Transition. With this configuration, in the pressure adjusting device 14 having the negative pressure fuel lock mechanism 23 as described in the related art, the engine can be easily started. Further, the engine can be easily started regardless of the opening of the throttle valve 6 determined by the position of the speed adjusting lever 10.

[0027]

[Embodiment 2] FIG. 3 is a schematic configuration diagram for explaining a second embodiment of the gas fuel engine of the present invention, and FIG. 4 is an enlarged vertical sectional view of a main part thereof. The difference between the second embodiment and the first embodiment is that the function of the starting solenoid 63 as the starting actuator of the first embodiment is constituted by a boost operation valve 71 which operates by the intake negative pressure of the intake passage 4. When,
Pressure regulating device 14 downstream from gas fuel storage tank 12
An electromagnetic valve 72 that operates in conjunction with a starter switch 67 is provided upstream of the suction port 28 of the first embodiment. The boost operation valve 72 is always opened when the engine is stopped at the stop position 70 of the starter switch 67 and when the engine is started at the start position 68 by the biasing force of the built-in valve spring 73 as shown in FIG. When the engine is operating, when the negative pressure in the intake passage 4 exceeds the set pressure value, the intake passage 4 is closed against the spring force.

When the starter switch 67 is turned on when the engine is started, the solenoid valve 72 is opened and the liquid fuel in the gas fuel storage tank 12 is supplied to the pressure regulator 14. The operation of the second embodiment will be briefly described. Before the start of the engine, there is no intake negative pressure, so that the boost operation valve 71 is in an open state, and the starter switch 67 is turned on at the start position 68 by the solenoid valve 72.
Therefore, the liquid fuel in the gas fuel storage tank 12 is not supplied to the primary pressure chamber 21 of the pressure adjusting device 14.

When the starter switch 67 is set to the starting position 68 to start the engine, the solenoid valve 72 is opened, and the liquid fuel is supplied to the primary pressure chamber 21. In that state, the boost valve 71 is open,
Gas fuel is supplied from the primary pressure chamber 21 to the secondary pressure chamber 22 and the mixer device 3 via the bypass passage 61, and the engine is started. After the engine starts, starter switch 6
7 is an operation state, the solenoid valve 72 is kept open, but the intake negative pressure in the intake passage 4 increases, and the boost operation valve 71 operates so as to close the bypass passage 61. Therefore, after the engine is started, the normal operation in which the gas fuel is supplied only from the communication hole 27 is performed.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the present invention. Hereinafter, such an embodiment will be briefly described. (1) Although the configuration of the speed adjusting lever and governor lever is simple in the above embodiment, it is apparent that the present invention is not limited to the specific configuration of the speed adjusting lever and governor lever, but can be applied to various mechanical governors. It is. (2) In the above embodiment, the primary pressure chamber 21 and the secondary pressure chamber 2
Although the second pressure adjusting means is mainly constituted by the first lever 30 and the second lever 40, the present invention can also be applied to a pressure constitution device employing another pressure regulating mechanism by similarly constituting the bypass passage 61. Obviously, the advantages of the above can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a gas fuel engine according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the gas fuel engine shown in FIG.

FIG. 3 is a schematic configuration diagram of a gas fuel engine according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of the gas fuel engine shown in FIG.

FIG. 5 is a schematic configuration diagram showing an example of a conventional gas fuel engine.

[Explanation of symbols]

2 ... Air cleaner, 3 ... Mixer device, 4 ... Intake passage, 5
... combustion chamber, 6 ... throttle valve, 8 ... governor lever, 9 ...
Governor spring, 10 speed adjusting lever, 11 governor force, 12 gas fuel storage tank, 14 pressure regulator, 16 gas fuel supply nozzle, 17 mechanical governor, 21 primary pressure chamber, 22 secondary pressure Chamber, 23 ... Negative pressure fuel lock mechanism, 27 ... Communication hole, 28 ... Suction port, 30 ...
1st lever, 40 ... 2nd lever, 61 ... bypass passage,
63: starting solenoid, 64: valve body, 67: starter switch, 71: boost operating valve, 72: solenoid valve.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02M 21/06 F02B 43/00 F02M 21/02 301

Claims (1)

(57) [Claims] The air from an air cleaner (2) is guided to an intake passage (4) through a mixer device (3), and the gas fuel and air are mixed in the mixer device (3) to form an air-fuel mixture. Air is supplied to the combustion chamber (5), and a throttle valve (6) is provided at a position of the intake passage (4) closer to the combustion chamber (5) than the mixer device (3). ) Is linked to the governor lever (8),
The governor lever (8) is configured to be connected to and driven by a speed adjusting lever (10) via a governor spring (9). The governor lever (8) is based on the tension of the governor spring (9) and the centrifugal force of the governor weight. A gas engine employing a centrifugal mechanical governor (17) configured to adjust and control the opening of the throttle valve (6) in balance with the governor force (11) generated by the gas fuel storage means (12). The gas fuel is led to a pressure regulator (14), and the gas fuel, which has been made substantially atmospheric pressure by the pressure regulator (14), is led to a gas fuel supply section (16) of the mixer device (3). The adjusting device (14) evaporates the liquid gas fuel and adjusts it to a primary pressure, and is communicated with the primary pressure chamber (21) through a communication hole (27). A secondary pressure chamber (22) for adjusting the pressure adjusted by the secondary pressure chamber (21) to a pressure substantially equal to atmospheric pressure; and a mixer device when the negative pressure in the intake passage (4) is smaller than a predetermined value. And (3) a negative pressure fuel lock means (23) for shutting off the supply of the gas fuel to the gas fuel storage tank (1).
Of the inlet (28) with which the gas pipe (13) from 2) communicates
It has a pressure adjusting means (30) for adjusting the pressure of the primary pressure chamber (21) by adjusting the inflow of the liquid gas fuel , and has a communication hole (27) in the secondary pressure chamber (22) through a communication hole (27). A pressure adjusting means (40) for adjusting the pressure of the secondary pressure chamber (22) by adjusting the amount of gas fuel flowing from the primary pressure chamber (21) into the secondary pressure chamber (22); Separately from (27), a bypass passage (61) for communicating the primary pressure chamber (21) and the secondary pressure chamber (22) is provided, and when the engine is started, the bypass passage (61) is communicated. After starting, the bypass passage (6
Control means (63, 71, 7) for controlling 1) to a cut-off state;
2) is provided, and the control means (71, 72) is provided with the gas fuel storage means (12).
Valve means (72) provided between the pressure regulating devices (14)
And a valve element (64) for opening and closing the bypass passage (61).
Start operating valve (71)
When the switch (67) is in the stop position, the valve means (7
2) functions to shut off the gas fuel supply,
Switch (67) is in the start position state and the operation position state.
Valve means (72) to supply gas fuel when
Function, while the boost actuating valve (71) is
(4) Bypass passage when the negative pressure exceeds the set pressure value
(61) functions to shut off, and the negative of the intake passage (4)
When the pressure does not exceed the set pressure value, the bypass passage (61)
A gas-fueled engine with a pressure regulator that functions to communicate