JPH10159659A - Gas mixer of gas engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the cool starting of an engine smoothly, by changing over a valve opening setting lever to a start setting attitude in a cool starting of an engine, and making a throttle valve in a start suitable attitude at a specific opening, so as to make the amount and the concentration of a mixing gas fed to a combustion chamber at an adequate value. SOLUTION: In the gas mixer of a gas engine, a valve opening setting lever 7 is provided at the outer side of a mixing body 1, and the valve opening setting lever 7 is made to change over a start setting attitude 9 and a start releasing attitude 10 to each other, as well as a receiver 8 is provided in the valve opening setting lever 7. A throttle valve 4 is made to a start suitable attitude 12 at a specific opening 11, by changing over the valve opening setting lever 7 to the start setting attitude 9, and a throttle input lever 6 is received by the receiver 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas mixer for a gas engine.

[0002]

2. Description of the Related Art In a carburetor of a gasoline engine,
A choke valve is provided as an auxiliary device for cold start.
In cold weather, gasoline does not vaporize sufficiently in the carburetor, or once vaporized, much of it liquefies immediately, so that when the mixture reaches the combustion chamber, its concentration becomes lean, Start may not be performed smoothly. For this reason, the choke valve is closed to increase the ratio of the amount of gasoline sucked out to the amount of intake air, so that a mixture of an appropriate concentration is supplied to the combustion chamber.

However, a choke valve cannot be used in a gas mixer of a gas engine. This is because, in cold weather, if the choke valve is closed and the fuel is sucked out in a liquid state, it is immediately vaporized, and the rich mixture is supplied to the combustion chamber, making it impossible to start. The cold start of the engine can be performed smoothly if the throttle valve of the engine is in a suitable starting position with a predetermined opening.However, conventional gas mixers require a means for setting the throttle valve to a suitable starting position with a predetermined opening. Not equipped.

[0004]

In the conventional gas mixer, the opening of the throttle valve at the time of starting the engine is not constant.
Opening is too small and the amount of air-fuel mixture supplied to the combustion chamber is insufficient, or the opening is too large and the concentration of air-fuel mixture supplied to the combustion chamber becomes too low, etc. In many cases, it cannot be performed smoothly.

The object of the first invention is as follows. The engine must be able to perform a cold start smoothly. Ensure that the valve opening setting lever does not hinder the adjustment of the throttle valve opening during normal operation. The object of the second invention is as follows in addition to the object of the first invention. When used in a general-purpose gas engine, the throttle valve can be set to an appropriate starting position by simple operation. When used in an automobile gas engine, the throttle valve can be set to a suitable starting position by a simple operation.

A third object of the present invention is as follows, in addition to the objects of the first or second invention. A compact arrangement of the throttle input lever and the valve opening setting lever. The object of the fourth invention is as follows in addition to the object of any one of the first invention to the third invention. A stopper for receiving a valve opening setting lever can be easily formed.

[0007]

[Means for Solving the Problems]

(First Invention) In a first invention, as shown in FIG. 2A, an intake passage 2 is provided in a mixing body 1, a venturi 3 is provided in the intake passage 2, and a downstream side of the venturi 3 A throttle valve 4 is provided in the intake passage 2, a throttle input lever 6 is fixed to a valve shaft 5 of the throttle valve 4 outside the mixing body 1, and a gas mixer of a gas engine is configured as follows. .

That is, as shown in FIGS. 2B and 2C, a valve opening setting lever 7 is provided outside the mixing body 1 and a receiving portion 8 is provided on the valve opening setting lever 7. As shown in FIGS. 1 (A) and (B), the valve opening degree setting lever 7 can be switched between a start setting posture 9 and a start release posture 10, and as shown in FIG.
When the valve opening degree setting lever 7 is switched to the starting setting posture 9 and the receiving portion 8 receives the throttle input lever 6,
As shown in FIG. 1B, when the valve opening degree setting lever 7 is switched to the start releasing posture 10, the receiving portion 8 interferes with the throttle input lever 6. It is characterized in that it retreats to a position where it does not.

(Second invention) In a second invention, as shown in FIG. 1A, in the first invention, a throttle input lever 6 which is about to rotate in a fully opening direction of a throttle valve 4 is received by a receiving portion 8. It is characterized by doing so.

(Third Invention) According to a third invention, as shown in FIG. 2A, in the first invention or the second invention, the valve opening setting lever 7 rotates around the valve shaft 5 of the throttle valve 4 as a center. It is characterized by moving.

(Fourth Invention) As shown in FIG. 2 (C), a fourth invention provides a method according to any one of the first to third inventions.
The body of the mixing body 1 is raised so that the stopper 15
When the stopper 15 receives the valve opening setting lever 7, the valve opening setting lever 7 is set to the starting setting posture 9.

[0012]

Actions and effects of the present invention

(First invention) The first invention has the following effects. As shown in FIG. 1 (A), at the time of cold start of the engine, the valve opening degree setting lever 7 is switched to the start setting posture 9, and is operated.
When the throttle input lever 6 is received by the receiving portion 8, the throttle valve 4 is moved to a starting suitable posture 12 with a predetermined opening 11.
Therefore, the amount and concentration of the air-fuel mixture supplied to the combustion chamber are optimized, and the cold start of the engine can be performed smoothly.

As shown in FIG. 1B, when the cold start of the engine is completed, the valve opening degree setting lever 7 is moved to the starting release posture 10.
In this case, the receiving portion 8 retreats to a position where it does not interfere with the throttle input lever 6, and the valve opening setting lever 7 does not hinder the interlocking of the throttle valve 4 during normal operation.

(Second Invention) The second invention has the following functions and effects in addition to the functions and effects of the first invention. As shown in FIG. 1, in the case of a general-purpose gas engine in which the throttle valve 4 is interlocked via the mechanical governor 16, FIG.
As shown in (B), the urging force of the governor spring 17 is 1
When the engine is stopped with the throttle input lever 8 being applied to the throttle input lever 6, and the valve opening setting lever 7 is switched to the start setting posture 9 at the time of cold start as shown in FIG. Since the throttle valve 4 is automatically rotated to the starting suitable posture 12 while being received by the receiving portion 8 and the throttle valve 4 is automatically set to the starting suitable posture 12, only a simple operation of switching the valve opening setting lever 7 is sufficient. .

In an automotive gas engine in which the throttle valve 4 is interlocked with the accelerator (not shown) without the intervention of the mechanical governor 16, the accelerator pedal is depressed after the valve opening degree setting lever 7 is switched to the start setting posture 9 during a cold start. Thus, the throttle input lever 6 is received by the receiving portion 8 and the starting position 9 is attained, so that only the simple operation of switching the opening degree setting lever 7 and depressing the accelerator is sufficient.

(Third invention) The third invention has the following functions and effects in addition to the functions and effects of the first invention or the second invention. As shown in FIG. 2A, since the throttle input lever 6 and the valve opening setting lever 7 can be overlapped in the axial direction of the valve shaft 5, they can be compactly arranged.

(Fourth Invention) The fourth invention has the following functions and effects in addition to the functions and effects of the second invention. As shown in FIG. 2 (C), since the stopper 15 for receiving the valve opening setting lever 7 is formed by raising the flesh of the mixing body 1, the stopper 15 can be formed at the same time when the mixing body 1 is molded. Can be easily formed.

[0018]

Embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a diagram illustrating a gas engine according to the embodiment of the present invention. The configuration of this engine is as follows. That is, the cylinder head 21 is mounted on the upper side of the cylinder block 20, and the timing transmission case 23 is mounted on the front side of the cylinder block 20 and the cylinder head 21 when the direction of the crankshaft axis 22 is viewed in the front-rear direction.
A valve operating cam case 24 is attached to the side of the cylinder block 20, and the front side of the valve operating cam case 24 is attached to the timing transmission case 23.
And a distributor 25 is attached to the rear side of the valve operating cam case 24. An intake manifold 26 is mounted on the side of the cylinder head 21, and a gas mixer 27 is mounted on a rear portion thereof. Air and gas fuel are introduced into the gas mixer 27. Air is introduced from the atmosphere through an air cleaner (not shown), and fuel gas is introduced from a fuel gas source 28 via a vapor riser 29.

The structure of the gas mixer 27 is as follows.
That is, as shown in FIG. 2A, an intake passage 2 is provided in the mixing body 1, a venturi 3 is provided in the intake passage 2, and a throttle valve is provided in the intake passage 2 on the downstream side of the venturi 3. The throttle input lever 6 is fixed to the valve shaft 5 of the throttle valve 4 outside the mixing body 1. The mixing body 1 is provided with a fuel gas introduction pipe 30 derived from the venturi 3, and the fuel gas is sucked into the venturi 3 from the fuel gas introduction pipe 30 via the gas nozzle 31. A valve shaft 5 of the throttle valve 4 is connected to a shaft insertion boss 32 formed on the mixing body 1.
Into the intake passage 2 in a longitudinal direction from the shaft insertion boss 32.
The bearing 33 is fitted inside the bearing. The throttle input lever 6 is fixed to the outer end of the valve shaft 5.

In this embodiment, in order to smoothly perform a cold start of the engine, FIG.
As shown in FIG. 1C, a valve opening setting lever 7 is provided outside the mixing body 1, a receiving portion 8 is provided on the valve opening setting lever 7, and as shown in FIGS. 1A and 1B. Thus, the valve opening degree setting lever 7 can be switched between the start setting posture 9 and the start release posture 10 as shown in FIG.
As shown in (A), when the valve opening setting lever 7 is switched to the starting setting posture 9 and the throttle input lever 6 is received by the receiving portion 8, the throttle valve 4 becomes the starting suitable posture 12 with the predetermined opening 11 and As shown in FIG. 1B, when the valve opening degree setting lever 7 is switched to the starting release posture 10,
The receiving portion 8 retreats to a position where it does not interfere with the throttle input lever 6.

The receiving portion 8 is formed at the distal end of the valve opening setting lever 7, and the base end of the valve opening setting lever 7 is connected to the input portion 34.
It has become. To switch the valve opening setting lever 7, the input section 34 of the valve opening setting lever 7 is connected to a push-pull rod 36 via a push-pull wire 35. Then, as shown in FIG. 1A, when the push-pull rod 36 is pulled, the valve opening setting lever 7 is switched to the starting setting posture 9.

As shown in FIGS. 2B and 2C, a tongue piece 40 is provided on the valve opening setting lever 7, and the tongue piece 40 comes into contact with the stopper 15 of the mixing body 1 to rotate. Is the start setting posture 9 of the valve opening setting lever 7. A tongue piece 38 is provided on the throttle input lever 6, and FIG.
As shown in (A), when the tongue piece 38 contacts the receiving portion 8 when the valve opening setting lever 7 is in the starting setting posture 9 and rotation stops, the throttle valve 4 is opened by a predetermined amount. Degree 1
The start suitable posture 12 is obtained.

The opening degree 11 of the throttle valve 4 in the starting suitable posture 12 is set according to the engine to which the gas mixer 27 is applied. In this embodiment, the opening of the throttle valve 4 in the fully closed position is set to 0 °, the opening in the fully open position is set to 90 °, and the opening 11 is set to 30 °. FIG.
As shown in FIG. 1A, the valve opening setting lever 7 is urged by a return spring 37, and when the push-pull rod 36 is pushed back as shown in FIG. It returns to 10. When the valve opening setting lever 7 is in the starting release posture 10, the throttle input lever 6 and the receiving portion 8 do not interfere with each other.
The throttle valve 4 can be opened / closed over the entire range 13.

As shown in FIG. 1A, the throttle input lever 6 which is to be rotated in the fully open direction of the throttle valve 4 is operated by a simple operation. The receiving portion 8 of the opening setting lever 7 receives the light. The tongue piece 38 of the throttle input lever 6 is formed on the distal end side of the throttle input lever 6, and the proximal end side of the throttle input lever 6 is an input section 41. In order to open and close the throttle valve 4, the input unit 41 is interlocked to a speed control lever 43 via an interlock rod 42 and a mechanical governor 16 in this order. The mechanical governor 16 includes a governor lever 44 and a governor spring 1.
7, the governor spring 17 is interposed between the governing lever 43 and the governor lever 44, and the governor lever 4
An interlocking rod 42 is interposed between the input lever 4 and the input portion 41 of the throttle input lever 6.

The biasing force 18 of the governor spring 17 attempts to rotate the throttle input lever 6 in the direction in which the throttle valve 4 is fully opened. The receiving portion 8 is located on the lower side in the fully opening direction than the tongue piece 38 of the throttle input lever 6. Therefore, the valve opening setting lever 7 is moved to the starting setting posture 9
, The throttle input lever 6 that is about to rotate in the fully open direction of the throttle valve 4 is received by the receiving portion 8.

In order to arrange the throttle input lever 6 and the valve opening setting lever 7 compactly, FIG.
As shown in (A), the valve opening setting lever 7 is configured to rotate around the valve shaft 5 of the throttle valve 4. The valve opening setting lever 7 is pivotally supported by a sleeve 39 externally fitted to the valve shaft 5.
Of the shaft insertion boss 32.

In order to facilitate the formation of the stopper 15 for receiving the valve opening degree setting lever 7, FIG.
As shown in (B) and (C), the flesh portion of the mixing body 1 is raised to form a stopper 15, and this stopper 1
By receiving the valve opening setting lever 7 at 5, the valve opening setting lever 7 is set to the starting setting posture 9. The stopper 15 is raised from the shaft insertion boss 32. The stopper 15 can be integrally molded when the mixing body 1 is cast by forming a recess for the stopper 15 in a mold of the mixing body 1.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a gas mixer of a gas engine according to an embodiment of the present invention, and FIG.
(B) shows a state during normal operation or during operation stop.

FIG. 2 is a view for explaining the gas mixer of FIG. 1, and FIG.
Is a longitudinal side view, FIG. 2 (B) is a side view, and FIG. 2 (C) is a front view.

FIG. 3 is a plan view of a main part of a gas engine including the gas mixer of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mixing body, 2 ... Intake path, 3 ... Venturi, 4 ... Throttle valve, 5 ... Valve shaft, 6 ... Throttle input lever, 7 ... Valve opening setting lever, 8 ... Receiving part, 9 ...
Start setting posture, 10 ... Start release posture, 11 ... Setting opening degree,
12 ... suitable posture for starting, 15 ... stopper.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Toshihiko Teramoto 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Works

Claims (4)

[Claims] An intake passage (2) is provided in a mixing body (1), a venturi (3) is provided in the intake passage (2), and an intake passage (2) is provided downstream of the venturi (3). In a gas mixer of a gas engine, a throttle valve (4) is provided inside, and a throttle input lever (6) is fixed to a valve shaft (5) of the throttle valve (4) outside the mixing body (1). ), A valve opening setting lever (7) is provided, the valve opening setting lever (7) is provided with a receiving portion (8), and the valve opening setting lever (7) is set in a starting setting posture.
(9) and the starting release posture (10) can be switched, the valve opening setting lever (7) is switched to the starting setting posture (9), and the throttle input lever (6) is received by the receiving part (8). When the throttle valve (4) is received, the throttle valve (4) is set to the starting suitable posture (12) with the predetermined opening (11). A gas mixer for a gas engine, wherein the gas lever is retracted to a position where it does not interfere with the input lever (6). 2. The gas mixer for a gas engine according to claim 1, wherein the throttle input lever (6) which is about to rotate in a fully open direction of the throttle valve (4) is received.
A gas mixer for a gas engine, characterized in that it is received by a gas mixer. 3. The gas mixer for a gas engine according to claim 1, wherein the valve opening setting lever is provided.
The gas mixer of a gas engine, characterized in that the gas turbine rotates about a valve shaft (5) of a throttle valve (4). 4. The gas mixer for a gas engine according to claim 1, wherein a flesh portion of the mixing body (1) is raised to form a stopper (15), and the valve is opened by the stopper (15). A gas mixer for a gas engine, characterized in that when the degree setting lever (7) is received, the valve opening degree setting lever (7) is set to a start setting posture (9).