JP2002276394A - Gas engine mounted with electronic governor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve the working efficiency in maintenance by allowing the collective removal of parts of an intake system and a fuel system only by removing an intake manifold. SOLUTION: A throttle valve 22 and an air-fuel mixer 23 are successively provided on the upstream side of an intake manifold 4, and a spark plug is provided in opposite to a combustion chamber. The throttle valve 22 is controllable by a governor actuator, and a main passage 26 for supplying gas fuel G to the air-fuel mixer 23 is allowed to communicate with a dividing passage 27 having an air-fuel ratio control valve 28. The air-fuel ratio control valve 28 is controllable by a valve drive motor 29. The ignition timing of the spark plug is controlled by an ignition coil. The governor actuator, the valve drive motor 29 of the air-fuel ratio control valve 28 and the ignition coil are mountable integrally with the intake manifold 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas engine equipped with an electronic governor, and to a technique for facilitating maintenance of the engine.

[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 gas temperature sensor, S4 is a stick sensor, S5 is a rotational speed sensor, 30 is an air-fuel ratio control circuit, 31 is a drive circuit for controlling a motor for controlling a valve drive motor 29 of an air-fuel ratio control valve 28, and 32 is a governor actuator 25. Drive circuit, 3
Reference numeral 3 denotes an igniter for controlling the ignition timing of the ignition plug 35 via the ignition coil 34.

In this gas engine E, a throttle valve 22 and an air-fuel mixer 23 are sequentially provided upstream of the intake manifold 4, a spark plug 35 is provided facing the combustion chamber 19, and the throttle valve 22 is connected to a governor actuator 25. And a main passage 26 for supplying gaseous fuel G to the air-fuel mixer 23 communicates with a branch passage 27 having an air-fuel ratio control valve 28 to drive the air-fuel ratio control valve 28. The ignition timing of the ignition plug 35 is controlled by an igniter 3 via an ignition coil 34.
3 is controlled. And conventionally,
The governor actuator 25, the valve drive motor 29 of the air-fuel ratio control valve 28, and the ignition coil 34 are arranged independently from each other only from the viewpoint of exerting their functions.

[0004]

When such an engine is mounted on an agricultural work machine or the like, it is often difficult to secure a sufficient space for maintenance. For example, the valve clearance of the valve train is adjusted from the intake side of the engine by removing the head cover.However, during maintenance, the intake system and fuel system parts are in the way. Will be secured. For this reason, work efficiency during maintenance is significantly reduced.

The present invention has been made in view of such circumstances, and has as its object to collect the intake system and fuel system components simply by removing the intake manifold in order to secure a space for maintenance. Can be removed
It is an object of the present invention to provide an arrangement of such parts that significantly improves the work efficiency during maintenance.

[0006]

The present invention has the following basic configuration. That is, a throttle valve 22 and an air-fuel mixer 23 are sequentially provided upstream of the intake manifold 4, and the combustion chamber 1
9 and a spark plug 35 is provided. The throttle valve 22 is configured to be controllable by a governor actuator 25, and communicates with a main passage 26 that supplies gas fuel G to the air-fuel mixer 23 and a branch passage 27 that includes an air-fuel ratio control valve 28. The air-fuel ratio control valve 28 is configured to be controllable by a valve drive motor 29, and the ignition timing of the ignition plug 35 is controlled by an igniter 33 via an ignition coil 34.

In order to solve the above-mentioned problems, the invention according to claim 1 is an electronic governor-equipped gas engine having the above-described basic configuration, wherein the governor actuator 25, the valve drive motor 29 of the air-fuel ratio control valve 28, and the It is characterized in that the ignition coil 34 is configured to be detachable integrally with the intake manifold 4.

According to a second aspect of the present invention, in the gas engine equipped with an electronic governor according to the first aspect, the air-fuel mixer 23, the main passage 26, and the branch passage 27 are integrally molded. It is characterized by.

According to a third aspect of the present invention, there is provided a gas engine equipped with an electronic governor according to the first or second aspect.
The ignition coil 34 is fixed to the intake manifold 4 so as to dissipate heat. Here, “fixed so that heat can be dissipated” means that the heat generated from the ignition coil 34 itself is
Heat is radiated to the intake manifold 4 through the fixed portion,
Depending on the low-temperature atmosphere of the intake manifold 4, the ignition coil 34
Means that the ignition coil 34 is fixed to the intake manifold 4 in a state in which the ignition coil 34 can be cooled.

[0010]

According to the first aspect of the present invention, in the gas engine equipped with the electronic governor having the basic configuration, the governor actuator 25, the valve drive motor 29 of the air-fuel ratio control valve 28, and the ignition coil 34 is configured so as to be detachable integrally with the intake manifold 4, so that the governor actuator 25, which is a component of the intake system or the fuel system, can be removed simply by removing the intake manifold 4 in order to secure a space for maintenance. The drive motor 29 and the ignition coil 34 can also be removed collectively, so that the work efficiency during maintenance can be remarkably improved.

(B) The air-fuel mixer 23 and the main passage 2
In the case where the sixth and branch passages 27 are formed separately from each other and arranged separately from each other, a compact arrangement is not obtained because, for example, an interconnecting pipe is required separately. In the gas engine equipped with an electronic governor according to claim 1, the air-fuel mixer 23, the main passage 26, and the branch passage 27 are integrally molded, so that the air-fuel mixer 23 and the respective The passages 26 and 27 can be communicated with each other at the shortest distance, and the arrangement can be made compact.

(C) During operation of the engine, heat is radiated from the engine, so that the surroundings of the engine are in a high-temperature atmosphere.
According to the third aspect of the present invention, the ignition coil can be dissipated to the intake manifold 4 in the electronic governor mounted with the electronic governor according to the first or second aspect of the invention. Since the mixture at normal temperature flows inside the intake manifold 4, the ignition coil 34 is cooled by the low-temperature atmosphere of the intake manifold 4, so that the ignition coil 34 is hardly overheated and has excellent durability.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas engine equipped with an electronic governor according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a main part of 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, and FIG. 4 is a left side view of the gas engine. is there.

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 gas engine E has the basic configuration described above. That is, as shown in FIGS. 1 to 4, a throttle valve 22 and an air-fuel mixer 23 are sequentially provided upstream of the intake manifold 4, and a spark plug 35 is provided facing the combustion chamber.
The throttle valve 22 is configured to be controllable by a governor actuator 25, and communicates with a main passage 26 that supplies gas fuel G to the air-fuel mixer 23 and a branch passage 27 that includes an air-fuel ratio control valve 28. Air-fuel ratio control valve 28
Are controlled by a valve drive motor 29, and the ignition timing of the ignition plug 35 is controlled by an igniter 33 via an ignition coil 34.

As shown in FIGS. 1, 3 and 4, an intake pipe 20 is provided integrally with the intake manifold 4,
An intake communication pipe 21 including the throttle valve 22 and the air-fuel mixer 23 communicates with the intake pipe 20. An air cleaner 37 is connected to one end 21 a of the intake communication pipe 21 via a communication duct 36. A blow-by gas oil separator 39 is connected to one end of the intake communication pipe 21 via a gas recirculation pipe 38.

As shown in FIGS. 3 and 4, a governor actuator 25 is fixed to the rear end of the intake manifold 4. The swing arm 22a of the throttle valve 22 and the swing arm 25a of the governor actuator 25 are fixed. Are connected so as to be able to interlock with the connecting rod 24.

As shown in FIG. 1, the air-fuel mixer 23 has a main passage 2 for supplying LP gas G as a gas fuel.
6 is connected to a branch passage 27 having an air-fuel ratio control valve 28, and the opening amount of the air-fuel ratio control valve 28 is controlled by a stepping motor 29 to control the intake pressure, oxygen concentration in exhaust gas, exhaust temperature, etc. It is configured to control the air-fuel ratio in accordance with Further, the air-fuel mixer 23, the main passage 26, and the branch passage 27 are integrally molded. this is,
The air-fuel mixer 23 and each of the passages 26 and 27 are intended to communicate with each other at the shortest distance, thereby achieving a compact arrangement. In FIG. 1, reference numeral 26a indicates a fuel gas G introduction pipe, and 26b indicates a throttle of the main passage 26.

As shown in FIGS. 1 and 4, the ignition coils 34 are fixedly mounted on the intake manifold 4 so as to dissipate heat. This is intended to prevent overheating of each ignition coil 34. That is, during the operation of the engine, the surroundings of the engine become a high-temperature atmosphere due to heat radiation of the engine, and the ignition coil 34 is heated in this high-temperature atmosphere,
Although the ignition coil 34 itself generates heat, it is easily overheated. However, since the mixture at normal temperature flows through the inside of the intake manifold 4, the ignition coil 34 is cooled by the low-temperature atmosphere of the intake manifold 4, so that it is difficult to overheat. Become
Excellent durability.

With the above configuration, the governor actuator 2
5. The valve drive motor 29 and the ignition coil 34 of the air-fuel ratio control valve 28 are fixed so as to be detachable integrally with the intake manifold 4, and only by removing the intake manifold 4,
Governor actuator 2 for intake and fuel systems
5. The valve drive motor 29 and the ignition coil 34 can also be removed collectively. As a result, a space for maintenance of the valve train can be secured, and work efficiency during maintenance is significantly improved.

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.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part taken out 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 manifold, 19 ... combustion chamber, 22 ... throttle valve, 23 ... air-fuel mixer, 25 ... governor actuator, 26 ... main passage, 27 ... branch passage, 28 ... air-fuel ratio control valve, 29 ... valve drive motor , 33 ... igniter, 34
... Ignition coil, 35 ... Ignition plug, G ... Gas fuel.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 21/04 F02M 21/04 D

Claims (3)

[Claims] 1. A throttle valve (22) and an air-fuel mixer (23) are sequentially provided upstream of an intake manifold (4), and a spark plug (35) is provided facing a combustion chamber (19). Connect the valve (22) to the governor actuator (2
5) and a main passage (2) for supplying gaseous fuel (G) to the air-fuel mixer (23).
6) and a diversion passage (27) including an air-fuel ratio control valve (28)
And the air-fuel ratio control valve (28) can be controlled by a valve drive motor (29).
In an electronic governor-equipped gas engine configured to control the ignition timing of the engine by an igniter (33) via an ignition coil (34), the governor actuator (25) and the valve drive motor (28) 29) An electronic governor mounted gas engine, wherein the ignition coil (34) and the intake manifold (4) are configured to be detachable integrally with the intake manifold (4). 2. The gas engine with an electronic governor according to claim 1, wherein the air-fuel mixer (23), the main passage (26), and the branch passage (27) are integrally molded. A gas engine equipped with an electronic governor. 3. The gas engine equipped with an electronic governor according to claim 1, wherein the ignition coil (34) is provided on the intake manifold (4).
A gas engine mounted with an electronic governor, wherein the gas engine is fixed so that heat can be dissipated.