JP2002276472A - Intake device for gas engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the arrangement and constitution of an intake device in a gas engine loaded with an electronic governor and to miniaturize the device. SOLUTION: An intake passage 4 is communicated with a gas mixer 23 provided with a throttle valve 22 and an air-fuel ratio control valve 28. A governor actuator 25 and a valve driving actuator 29 are assembled to the gas mixer 23. The throttle valve 22 is fixed to an output shaft of the governor actuator 25. The air-fuel ratio control valve 28 is fixed to an output shaft of the valve driving actuator 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for a gas engine equipped with an electronic governor, and more particularly to a technique for simplifying the arrangement of the intake device.

[0002]

2. Description of the Related Art As a gas engine equipped with an electronic governor,
For example, there is one shown in FIG. FIG. 5 is a schematic view of a gas engine equipped with an electronic governor, and reference numeral E in FIG. 5 indicates the entire gas engine. The gas engine E is configured to optimally control the air-fuel ratio, the ignition timing, and the like according to the operating conditions while suppressing the generation of pollutants (CO, HC, NOx) in the exhaust gas. Here, reference numeral 4 in FIG.
Is an intake manifold, 5 is an exhaust manifold, 18 is a three-way catalyst, S1 is a pressure sensor, S2 is an oxygen concentration sensor, S
3 is an exhaust temperature sensor, S4 is a stick sensor, S5 is a rotation speed sensor, 30 is an air-fuel ratio control circuit, 31 is a drive circuit for controlling an actuator that controls a valve drive actuator 29 of an air-fuel ratio control valve 28, and 32 is a governor actuator 2.
A drive circuit 5 and an igniter 33 for controlling the ignition timing of the ignition plug 35 via the ignition coil 34 are respectively shown.

In the intake system of the gas engine E, a gas mixer 23 having a rotary valve 22 and an air-fuel ratio control valve 28 communicates with the intake manifold 4, and the throttle valve 22
Is controlled by the governor actuator 25,
The air-fuel ratio control valve 28 is configured to be controlled by a valve drive actuator 29. Conventionally, the throttle valve 22 is configured to be interlocked by a governor actuator 25 that is separately disposed, and the air-fuel ratio control valve 28 is configured to be interlocked by a valve drive actuator 29 that is separately disposed.

[0004]

Conventionally, the throttle valve 22 is configured to be interlocked by a governor actuator 25 that is spaced apart, and the air-fuel ratio control valve 28 is configured to be able to be linked by a valve drive actuator 29 that is spaced apart. Therefore, the arrangement of each interlocking connection member becomes complicated,
The intake device cannot be made compact. The present invention has been made in view of such circumstances, and an object of the present invention is to simplify the arrangement of an intake device in a gas engine equipped with an electronic governor, and to reduce the size of the intake device.

[0005]

According to one aspect of the present invention, there is provided a gas engine in which a gas mixer having a throttle valve and an air-fuel ratio control valve communicates with an intake passage. In the intake device, a governor actuator 25 and a valve drive actuator 29 are assembled to the gas mixer 23, and the governor actuator 25
While fixing the throttle valve 22 to the output shaft of
The air-fuel ratio control valve 28 is fixed to an output shaft of the valve drive actuator 29.

According to a second aspect of the present invention, in the intake system for a gas engine according to the first aspect, the gas mixer 23 is connected to the venturi section 24 and the main passage 2 for the fuel gas G.
It is characterized by being integrally molded by the intake communication pipe 21 having the flow path 6 and the branch passage 27.

[0007]

According to the first aspect of the present invention, the governor actuator 25 and the valve drive actuator 29 are assembled to the gas mixer 23, and the throttle valve 22 is fixed to the output shaft of the governor actuator 25. At the same time, since the air-fuel ratio control valve 28 is fixed to the output shaft of the valve drive actuator 29, a member that interlocks the throttle valve 22 and the governor actuator 25 and the air-fuel ratio control valve 28 and the valve drive motor 29 The number of members to be linked and connected is minimized. That is, it is possible to greatly reduce the arrangement space of the connecting member. This simplifies the arrangement of the intake device of the gas engine,
The size can be reduced.

(B) In the second aspect of the present invention, in the intake system for a gas engine according to the first aspect, the gas mixer (23) includes a venturi section (24), a main passage (26) and a branch passage (27) for the fuel gas (G). Provided intake communication pipe 21
As a result, the venturi portion 24 and each of the passages 26 and 27 can communicate with each other in the shortest distance, and the gas mixer 23 can be arranged in a compact arrangement.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gas engine equipped with an electronic governor according to the present invention. FIG. 1 is a sectional view of a main portion of an intake device according to the present invention, FIG. 2 is a front view of the gas engine, FIG. 3 is a plan view of the gas engine, and FIG. 4 is a left side view of the gas engine.

The gas engine E equipped with an electronic governor is a vertical four-cylinder gas engine. As shown in FIGS. 2 to 4, a cylinder block 1 and a crankcase 2 are integrally formed. The head 3 is fixed, the intake manifold 4 is fixed to the left side of the cylinder head 3, the exhaust manifold 5 is fixed to the right side of the cylinder head 3, the oil pan 6 is fixed to the lower surface of the crankcase 2, and the cylinder block 1 is fixed. And a gear case 7 fixed to the front surface of the crankcase 2 and a fan drive pulley 8
, The fan pulley 9 and the alternator pulley 10 are linked by an endless belt 11, and a flywheel 12
Are arranged. 2 to 4, reference numeral 13 denotes a radiator fan, 14 denotes an oil filter, 15 denotes an oil netter, and 16 denotes a cell starter.

The intake device of the gas engine E is shown in FIGS.
As shown in FIG. 4, a gas mixer 23 having a throttle valve 22 and an air-fuel ratio control valve 28 is connected to the intake manifold 4 forming an intake passage, and the throttle valve 22 is configured to be controllable by a governor actuator 25.
The air-fuel ratio control valve 28 is configured to be controlled by a valve drive actuator 29.

As shown in FIGS. 1, 3 and 4, an intake pipe 20 is integrally provided on the intake manifold 4,
An intake communication pipe 21 including the throttle valve 22 and the venturi portion 24 is connected to the intake pipe 20 in a communicating manner. An air cleaner 37 is connected to one end 21 a of the intake communication pipe 21 via a communication duct 36. Further, near one end of the intake communication pipe 21, a gas recirculation pipe 3 is provided.
An oil separator 39 for the blow-by gas is communicated through 8.

As shown in FIGS. 1 and 3, the venturi section 24 has a main passage 26 for supplying LP gas G as a gaseous fuel and a branch passage 2 having an air-fuel ratio control valve 28.
The air-fuel ratio is controlled in accordance with the intake pressure and the oxygen concentration in the exhaust gas by controlling the opening amount of the air-fuel ratio control valve 28 by a stepping motor 29 which is a valve drive actuator. Is configured. Further, the gas mixer 23 including the venturi section 24, the main passage 26, and the branch passage 27 is integrally molded by the intake communication pipe 21. This is intended to make the gas mixer 23 a compact arrangement by connecting the venturi section 24 and the above-mentioned passages 26 and 27 with the shortest distance.

The governor actuator 25 and the valve drive actuator 29 are assembled to the intake communication pipe 21 constituting the gas mixer 23, and the throttle valve 22 is fixed to the output shaft of the governor actuator 25. The air-fuel ratio control valve 28 is fixed to an output shaft 29. This minimizes the members for interlocking the throttle valve 22 and the governor actuator 25 and the members for interlocking the air-fuel ratio control valve 28 and the valve drive actuator 29, thereby greatly reducing the arrangement space for the connection members. It is intended to do so. Thus, the arrangement of the intake device can be simplified, and its size can be reduced. In addition, with the simplification and compactness of the arrangement of the intake device, maintenance work on the intake device is also facilitated. The reference numeral 26a in FIG.
Reference numeral 26b denotes a throttle of the main passage 26, respectively.

As shown in FIGS. 3 and 4, each of the ignition coils 34 is fixed to the intake manifold 4 so as to dissipate heat. This is intended to prevent overheating of each ignition coil 34. That is, during engine operation,
The surroundings of the engine are heated to a high-temperature atmosphere due to the heat radiation of the engine, and the ignition coil 34 is heated in this high-temperature atmosphere, and the ignition coil 34 itself generates heat. By circulating, the ignition coil 34 is cooled by the low-temperature atmosphere of the intake manifold 4, so that the ignition coil 34 is less likely to be overheated and has excellent durability.

In the above embodiment, the gas mixer 2
3 illustrates an example including the venturi portion 24, but the present invention is not limited to this embodiment,
Any fuel gas may be supplied into the intake passage instead of the venturi section 24. In addition, various design changes can be made without departing from the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part taken out of an intake device according to the present invention.

FIG. 2 is a front view of a gas engine equipped with an electronic governor according to the present invention.

FIG. 3 is a plan view of the gas engine.

FIG. 4 is a left side view of the gas engine.

FIG. 5 is a schematic view of a gas engine equipped with an electronic governor.

[Explanation of symbols]

4 ... intake passage (intake manifold), 22 ... throttle valve, 23 ... gas mixer, 24 ... venturi section, 25 ...
Governor actuator, 26: main passage, 27: branch passage, 28: air-fuel ratio control valve, 29: valve drive actuator (stepping motor), G: gas fuel.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 31/00 301 F02D 31/00 301A F02M 21/02 F02M 21/02 L 311 311L

Claims (2)

[Claims] 1. A throttle valve (22) in an intake passage (4).
Gas mixer (23) provided with an air-fuel ratio control valve (28)
The governor actuator (25) and the valve drive actuator (29) are assembled to the gas mixer (23), and the throttle valve (2) is attached to the output shaft of the governor actuator (25).
An intake system for a gas engine, wherein 2) is fixed and the air-fuel ratio control valve (28) is fixed to an output shaft of the valve drive actuator (29). 2. The intake device for a gas engine according to claim 1, wherein the gas mixer (23) includes a venturi section (24), a main passage (26) for the fuel gas (G), and a branch passage (2).
7) An intake device for a gas engine, which is integrally molded with an intake communication pipe (21) having the following.