JP3103245B2 - Turning work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of gas fueling equipment necessary for a gas engine as an engine of a turning work vehicle such as a backhoe.

[0002]

2. Description of the Related Art In a conventional turning work vehicle, a diesel engine is often mounted as an engine, and a fuel tank for storing fuel such as light oil is disposed.

[0003]

However, the exhaust gas has
The destruction of the atmospheric environment by carbon oxides and nitrogen oxides has become a problem, and it has become necessary to change the prime mover from a diesel engine to a gas engine. The problem at this time is the mounting position of the three-way catalyst, the paper riser, the mixer, and the like, which is not required when heavy oil or light oil is used as fuel. Paperizers and mixers do not require a special mounting position, but a three-way catalyst is vulnerable to vibration, and if it is mounted directly on an engine, the catalyst may peel off, resulting in sufficient exhaust. The effect of reducing gaseous carbon dioxide and nitrogen oxides cannot be exhibited. The present invention provides a gas engine as described above.
The arrangement of the gas appliances is made effective.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in a turning work vehicle in which a gas engine driven by gas fuel is mounted in a bonnet, a gas fuel device is arranged above a hydraulic pump for a working machine attached to the gas engine.

[0005] Further, a three-way catalyst, an exhaust muffler, and an air cleaner constituting a gas fuel device are arranged above an exhaust manifold.

Further, the three-way catalyst is fixed to the bonnet side, and the exhaust muffler and the air cleaner are connected to the three-way catalyst by a flexible pipe.

[0007]

Next, the operation will be described. That is, in a turning work vehicle in which a gas engine driven by gas fuel is mounted in a bonnet, a gas fuel device is disposed above a hydraulic pump for a working machine attached to the gas engine. The distance between the fuel device and the fuel device can be reduced, and the connection configuration can be simplified. Further, the space inside the hood 4 can be saved. Further, since the three-way catalyst constituting the gas fuel device is disposed above the exhaust manifold, the length of the gas engine E can be made compact. Further, since the three-way catalyst is fixed to the bonnet side and the exhaust muffler and the air cleaner are connected by a flexible pipe between the three-way catalyst and the three-way catalyst, the three-way catalyst 15 which may be separated due to vibration of the catalyst portion is used. , It can be supported from the hood 4 on the side with less vibration. Further, since the exhaust manifold 27 and the exhaust muffler 16 which need to be connected to the three-way catalyst 15 are connected by the flexible pipes 18 and 19, vibrations different from each other are generated.
・ Can be absorbed by 19.

[0008]

Next, an embodiment will be described. 1 is a right side view of the turning work vehicle of the present invention, FIG. 2 is a left side view of the turning work vehicle of the present invention with the bucket arm removed, FIG. 3 is an enlarged plan view of the turning work vehicle of the present invention, and FIG. 5 is an enlarged side view showing the inside of the hood 4, FIG. 6 is an enlarged side view showing the arrangement of the gas engine E and its surrounding gas appliances, and FIG. 7 is a turning work vehicle. FIG. 8 is a plan view of the hydraulic device for the working machine, FIG. 9 is a rear view of the hydraulic device for the working machine, and FIG. 10 is a drawing showing a fuel control system of the gas engine E. .

Referring to FIGS. 1, 2, 3 and 4, the structure of the turning work vehicle will be described. On one side of the crawler-type traveling device 6, a soil discharging plate 13 is projected so as to be vertically rotatable. A swivel bearing 11 is arranged at the center of the crawler type traveling device 6, and the swivel bearing 7 supports the swivel frame 7 so that it can fully swing.

On the turning frame 7, a gas engine E
And the gas engine E is covered with a hood 4. In addition, a cabin 5 as a living space is arranged at the front half of the left half of the revolving frame 7, and the gas cylinder 1 and the hydraulic oil tank 2 are arranged on the right front part of the revolving frame 7 opposite to the cabin 5 in an overlapping state. doing. The swing cylinder 22 that rotates the main boom 8 right and left is
Conventionally, the swing cylinder 22 is disposed inside the revolving frame 7 on the side opposite to the seat 3 which is a living space. Has been placed.

In particular, the hydraulic oil tank 2 is configured so as to be higher than the revolving frame 7, but the gas cylinder 1 is placed horizontally at a low position so as to be disposed inside the revolving frame 7. And The hydraulic oil in the hydraulic oil tank 2 includes a main boom 8 at the front, a bucket arm 9,
The bucket 10 is supplied to a hydraulic cylinder for rotating the bucket. In this embodiment, the gas cylinder 1
Is mounted on a turning frame 7 on the opposite side of the cabin 5 which is a living space, and is further disposed inside the turning frame 7 at a position below the hydraulic oil tank 2 as a horizontal position in an overlapping state. It is doing.

The main part of the present invention relates to a gas fuel device for supplying gas from the gas cylinder 1 to the gas engine E. In particular, the three-way catalyst 15, the paper riser 20, the mixer 21 and the like are required. FIG. 10 shows a system diagram of the gas engine E and the gas fuel device. The fuel gas from the gas cylinder 1 is guided to the paper riser 20 via the filter 25 and the solenoid valve 26. The mixture is supplied from the paper riser 20 to the mixer 21, mixed with the supply air in the mixer 21, and supplied to the cylinder head.

The fuel burns in the cylinder head of the gas engine E, and the combustion gas passes through the three-way catalyst 15 and is released to the atmosphere. A controller 27 for controlling the degree of opening and closing of the mixer 21 is provided.
The combustion gas O2 sensor 28 and the rotation speed sensor 2
9 and signals from the vacuum sensor 30 between the mixer 21 and the cylinder head. Based on signals from these sensors, the controller 27 makes a decision and opens and closes the mixer 21.

FIGS. 7, 8, and 9 show a hydraulic pump P and a hydraulic valve V for supplying pressure oil for operating a work machine.
The configuration of 1 · V2 is shown. The portion of the hydraulic pump shaft 30 shown in FIG. 8 is directly connected to and driven by the crankshaft of the gas engine E. Further, the valve is integrally fixed to the left and right sides of the hydraulic pump P to form an integral structure of the hydraulic pump P and the valve.

Next, referring to FIGS. 4, 5 and 6, the gas engine E inside the bonnet 4 and the mounting structure around it will be described. The three-way catalyst 15 has a possibility that the metal catalyst portion disposed inside may fall off due to vibration, and is weak against vibration. Therefore, the three-way catalyst 15 cannot be fixed to the gas engine E side. Is mounted between the lower revolving frame 7 and fixed to the three-way catalyst bracket 28. The three-way catalyst 15 is connected to the exhaust manifold 2.
7 are arranged in the same direction on the left and right. But,
Since the exhaust muffler 16 and the exhaust manifold 27 cannot be fixed to the three-way catalyst bracket 28 but are fixed to the gas engine E, the two are connected by flexible pipes 18 and 19 to reduce the difference in vibration. Absorbing. An air cleaner 17 is provided at the rear of the gas engine E.

Further, an exhaust pipe 29 from the exhaust muffler 16 is arranged downward inside the bonnet 4 so that water discharged when the gas engine E is started can be discharged. Also, as shown in FIG. 4, a solenoid valve 2 is mounted on a portion where the hydraulic pump P and the valve are integrated.
6 is mounted and fixed. Further, a three-way catalyst 15, an exhaust muffler 16, and an air cleaner 17 are disposed above the position.

[0017]

As described above, the present invention has the following advantages. That is, since the configuration as described in claim 1 can shorten the distance between the gas engine E and the gas fuel device, the connection configuration can be simplified. Further, the space inside the hood 4 can be saved.

Since the three-way catalyst constituting the gas fuel device is disposed above the exhaust manifold, the length of the gas engine E can be made compact. This can also save space inside the hood 4.

In addition, since the three-way catalyst is fixed to the bonnet side and the exhaust muffler and the air cleaner are connected to the three-way catalyst by a flexible pipe, the catalyst part is separated by vibration. The possible three-way catalyst 15 can be supported from the bonnet 4 on the side with less vibration. Further, the exhaust manifold 27 and the exhaust muffler 16 which need to be connected to the three-way catalyst 15
Are connected by the flexible pipes 18 and 19, so that vibrations different from each other are caused by the flexible pipes 18 and 1.
9 can be absorbed.

[Brief description of the drawings]

FIG. 1 is a right side view of a turning work vehicle according to the present invention.

FIG. 2 is a left side view showing a state where a bucket arm portion is removed.

FIG. 3 is an enlarged plan view of the turning work vehicle of the present invention.

FIG. 4 is an enlarged rear view showing the inside of the hood 4;

FIG. 5 is an enlarged side view showing the inside of the hood 4;

FIG. 6 is an enlarged side view showing an arrangement of a gas engine E and gas appliances around the gas engine E.

FIG. 7 is a side view of a hydraulic device for a working machine of the turning work vehicle.

FIG. 8 is a plan view of the hydraulic device for the working machine.

FIG. 9 is a rear view of the hydraulic device for the working machine.

FIG. 10 is a diagram showing a fuel control system of a gas engine E.

[Explanation of symbols]

 E Gas engine 1 Gas cylinder 2 Hydraulic oil tank 4 Bonnet 7 Swivel frame 15 Three-way catalyst 16 Exhaust muffler 17 Air cleaner 22 Swing cylinder 26 Solenoid valve 27 Exhaust manifold 28 Three-way catalyst bracket

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hideo Shimazoe 428 Enami, Okayama City Inside of Seirai Industry Co., Ltd. (56) References JP-A-48-70226 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 15/063

Claims (3)

(57) [Claims] 1. A turning work vehicle in which a gas engine driven by gas fuel is mounted in a bonnet, wherein a gas fuel device is disposed above a hydraulic pump for a working machine attached to the gas engine. Turning work vehicle. 2. The turning work vehicle according to claim 1, wherein the three-way catalyst constituting the gas fuel device, the exhaust muffler,
A turning vehicle having an air cleaner disposed above an exhaust manifold. 3. The turning work vehicle according to claim 2, wherein the three-way catalyst is fixed to the bonnet side, and the exhaust muffler and the air cleaner are connected by a flexible pipe between the three-way catalyst and the three-way catalyst. Turning work vehicle.