JPH02279423A - Excavating service car - Google Patents

Abstract

PURPOSE:To keep off the dissipation of engine noise as well as to abate a noise level by providing both upper and lower bodies, an engine cover and an excavator, and setting up an air distributing duct and an exhaust expansion chamber in the engine cover at the cooling air downstream side of an engine. CONSTITUTION:Each of crawler type travel gears 17L, 17R is set up in a part of a lower body 5, projecting a blade 20 from this lower body 5. Then, a swivel base bearing 18 is set up in the lower body 5, and an upper body 2 is rotatably mounted on this bearing 18, while an excavator K fitted with a bucket 19 at the tip is set up in a front end of the upper body 2. In addition, an engine cover 1, whose front top is set down to a seat S, is installed in a rear part of the upper body 2, and an air-cooled engine E, a hydraulic fluid tank 16, a fuel tank 15 and a battery or the like are set up inside the engine cover, while an air distributing duct 4 is installed at a cooling air downstream side of the engine E, and an exhaust expansion chamber 3 is formed in the upper body 2 beneath this air distributing duct 4.

Description

[Detailed description of the invention] (a) Industrial application field The present invention lowers the seat position, narrows the left and right width,
The invention also relates to an excavation work vehicle that has short front and rear lengths and a small turning radius.

(b) Prior Art The technology relating to small excavation vehicles has been known for some time.

For example, Utility Model Application Publication No. 57-17881, Utility Model Application Publication No. 61
This is similar to the technique described in Japanese Patent No. 169655.

(c) Problems to be solved by the invention However, in the above conventional technology, a water-cooled engine is placed inside the engine compartment, and a radiator, hydraulic oil tank, fuel tank, etc. are used to cool the water-cooled engine. The width cannot be narrowed because of the arrangement of the holes, and the length from front to back is long. They were unable to carry out work such as digging drainage ditches.

The present invention uses an air-cooled engine as an engine in order to reduce the width, height, and length of the excavation work vehicle so that excavation work can be carried out in orchards, thereby eliminating the need for a radiator. The increase in noise level caused by making the engine narrow in the width direction and making it an air-cooled engine was solved by covering it with a sealed engine cover. , cooling and combustion air intakes are placed on the sides and front of the upper vehicle body to reduce the noise generated inside the engine cover, and to remove the heat trapped inside the engine cover through the exhaust duct and exhaust. It is designed to allow smooth discharge from the expansion chamber.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the configuration for achieving the objects will be explained.

This is an excavation work vehicle equipped with a lower body 5, an upper body 2, an engine cover 1, and an excavator K, in which an engine E is disposed inside the engine cover 1, and an exhaust duct 4 is disposed on the downstream side of the cooling air of the engine E. An exhaust expansion chamber 3 is arranged.

Further, an intake expansion chamber 7 is provided at a position opposite to the exhaust expansion chamber 3 across the engine E.

In addition, an intake duct 13 is provided in front of the intake swelling chamber 7,
An intake opening 14 is opened at the front end of the upper vehicle body 2 with which the intake duct I3 communicates.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side view of the excavation vehicle of the present invention, FIG. 2 is a front view, FIG. 3 is a rear view, FIG. 4 is a plan view, and FIG. 5 shows the inside of the engine cover 1. 6 is a side sectional view, FIG. 7 is a rear sectional view, FIG. 8 is a side view of the fuel tank 15 and hydraulic oil tank 6, and FIG. 9 is a front view of the lifting hook 8. 10 is a side view of the cooling intake port 39, FIG. 11 is a plan sectional view, and FIG. 12 is a rear sectional view of the upper vehicle body 2.
The figure is also a front view of the upper vehicle body 2.

The overall configuration will be explained with reference to FIGS. 1, 2, 3, and 4.

A crawler type traveling device 17 [2, 17
R is arranged, and the blade 20 protrudes from the lower body 5.

A swivel base bearing 18 is arranged on the lower vehicle body 5, and the swivel base bearing 1
The upper vehicle body 2 is placed on top of the vehicle 8.

The upper vehicle body 2 is rotatably supported at the swivel base bearing 18 .

An excavation device K is arranged at the front end of the upper vehicle body 2.

The excavation bag fiK includes a boom 22, an arm 25, and a packet 1.
9 are connected to each other, and the position of the packet 19 can be controlled by a boom cylinder 26, an arm cylinder 23, a packet cylinder 24, and a swing cylinder 27 shown in FIG.

On the upper body 2, at the rear of the drilling rig, there is an operating column 2.
1 stands upright, and a handle frame 28 is arranged around the operation column 21.

A seat S is arranged at the rear of the operating column 21, and the seat S is arranged in a recess formed in the center of the engine cover 1.

Further, the rear surface of the seat S of the engine cover 1 is configured as a backrest 1a that projects upward. A lifting hook 8 is provided between the operating column 21 and the front part of the engine cover 1, and the lifting hook 8 protrudes from the upper vehicle body 2, and the hydraulic pipe or the hydraulic cylinder is operated on the lower inside of the lifting hook 8. Hydraulic valve and crawler 2 traveling equipment W17
The head of the swivel joint that takes over the pressure oil to the hydraulic motor that drives L/17R is located.

These hydraulic components are covered by a frame-shaped lifting hook 8, and a hook rod 8a and a hook portion 8b are arranged in the center of the lifting hook 8.

Next, in Figures 5, 6, and 7, the engine cover 1
Let me explain the internal structure of.

The upper part of the swivel base bearing 18 is arranged in the center of the upper vehicle body 2, and the swivel hydraulic motor 41 and the swivel joint 42 drive the swivel base bearing 18.
is located inside.

In the case of a normal excavation work vehicle, since the upper body 2 is located high, a swivel joint 42 is installed inside the swivel base bearing 18.
However, when the vehicle height is lowered as in the present invention, the upper parts of the hydraulic swing motor 41 and swivel joint 42 protrude from the upper vehicle body 2.

In addition, the hydraulic vibrator connected to these from the hydraulic pump P and the hydraulic vibrator to the hydraulic valve provided in the operation column 21 are arranged around the swing hydraulic motor 41 and the swivel joint 42, so that these parts are covered. Therefore, as shown in FIG. 9, a framework-shaped lifting hook 8 is provided to span the swing hydraulic motor 41 and the swivel joint 42.

Then, the central part of the lifting hook 8 is made to protrude and the hook rod 8 is
a is provided, and the hook portion 8b is provided on the hook rod 8a.

Conventionally, as in Utility Model Application No. 61-169655, hooks were provided at the front and rear to lift the aircraft, but in the present invention, a lifting hook 8 is provided in the center of the fuselage, and the entire aircraft can be lifted with just the lifting hook 8. It is said that As shown in FIG. 9, the hook rod 8a is normally not needed, so it is covered with an elastic cover 10.

An engine cover 1 covers the rear part of the upper vehicle body 2, and an engine E, a hydraulic oil tank 16, and a fuel tank 1 are installed inside.
5, battery B, etc. are arranged.

In conventional excavation work vehicles, a water-cooled engine was installed, so a radiator for cooling the engine was placed on the side of the vehicle, making the overall width of the machine larger, and the hydraulic oil tank 16 and fuel tank 15 were installed on the engine E. It needed to be established earlier. This resulted in the front and rear lengths becoming longer.

In order to improve this point, in the present invention, the engine E is made into an air-cooled engine without a radiator, the left and right width is narrowed, and the hydraulic oil tank 16 is arranged on the side. Further, a fuel tank 15 is disposed above the hydraulic oil tank 16, an air exhaust duct 4 is provided in front, and an upper vehicle body 2 is provided below the air exhaust duct 4.
An exhaust expansion chamber 3 is configured inside the exhaust gas expansion chamber 3, and the engine E is cooled by once expanding the exhaust air in the exhaust expansion chamber 3 to reduce the noise level and then discharging it to the outside air.

An exhaust port 3 is provided on the side of the upper vehicle body 2 constituting the exhaust expansion chamber 3.
A is provided to discharge the exhaust air that has cooled the engine E to the outside air.

Further, a PTO shaft 40 is protruded from the engine E at a position between the hydraulic oil tank 16 and the exhaust duct 4, and a hydraulic pump P is attached to the PTO shaft 40.
Pressure oil is sent to R and various hydraulic cylinders.

In addition, for intake of combustion air into the engine E, a combustion air passage 13 is provided from the intake opening 14 at the front end of the upper vehicle body 2.
The air that has passed through the combustion air passage 13 is expanded and muffled by the intake expansion chamber 7, and then guided to the air cleaner 9 via the guide duct 11. Combustion air is supplied into the engine E from the air cleaner 9, and the exhaust gas after combustion is guided downward from the muffler 12 by an exhaust vibrator 34, muffled by the sub-muffler 34a at the lower end, and then discharged downward into the fuselage.

Cooling air for cooling the engine E is taken in through the intake openings 14 and 30 at the front of the upper vehicle body 2, and the space inside the upper vehicle body 2 where the swing cylinder 27 is arranged is also used as a duct, and the air inside the upper vehicle body 2 is The air then enters the engine cover 1 and is sucked into the cooling fan through the cooling intake port 39.

The cooling air discharged from the cooling fan passes through the outer wall of the air-cooled engine E while cooling it, and is discharged to the side of the hydraulic pump P on the opposite side of the cooling intake port 39. An exhaust duct 4 having a cooling air intake is disposed on the side of the hydraulic pump P, and the cooling air is guided from inside the exhaust duct 4 to the exhaust expansion chamber 3.

Since the inside of the engine cover 1 is sealed, the cooling air does not flow in other directions, but is guided toward the exhaust expansion chamber 3 and the exhaust duct 4 that communicates with the exhaust port 3a to the outside air.

A battery B is placed on top of the exhaust expansion chamber 3.

Further, as shown in FIG. 6, a control panel C is arranged on the left side of the engine power bar 1.

In FIGS. 7 and 12, the engine E is mounted on an engine frame 31, and the engine E is placed on the engine frame 31.
1 constitutes a recess extending to the bottom surface of the upper vehicle body 2, and an engine E is fitted into the recess. This configuration allows the engine E to be placed as low as possible.

Further, both ends of the engine frame 31 are placed on frame mounting stands 32 and 33 formed on the upper vehicle body 2 via anti-vibration rubber.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

With the configuration as claimed in claim (1), by sealing the engine E with the engine cover 1, it is possible to prevent the engine noise from dissipating, thereby suppressing the increase in the noise level, and also preventing the cooling air from dissipating. Exhaust duct 4
Since the air is exhausted to the outside air from the exhaust port 3a through the exhaust expansion chamber 3, it is possible to muffle the sound in the exhaust expansion chamber 3.
This also made it possible to suppress the increase in noise level.

Furthermore, since the engine cooling air is smoothly discharged to the outside air from the exhaust duct 4 and the exhaust expansion chamber 3, an increase in temperature inside the engine cover 1 can be avoided.

With the configuration as claimed in claim (2), there is a risk that noise will be dissipated from the intake port of the air supplied to the engine E in the engine cover 1. However, by providing the intake expansion chamber 7 in the intake passage, Since the combustion chamber noise coming out of the air cleaner 9 is muffled by the intake expansion chamber 7, an increase in the noise level can be suppressed.

Since the configuration is as set forth in claim (3), the cooling air exhaust port 3a
In addition, since the cooling air intake openings 14 are arranged at separate positions, the noise source can be dispersed, and the noise level can also be reduced.

In addition, the high temperature cooling air discharged from the exhaust port 3a is transferred to the intake port 1.
Since there is no suction from air 4, an increase in intake air temperature can be avoided.

Furthermore, since the length of the intake duct 13 that takes air into the air cleaner 9 can be increased, the noise reduction effect can be improved, and the inertia effect of the air intake can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overall side view of the excavation vehicle of the present invention, FIG. 2 is a front view, FIG. 3 is a rear view, FIG. 4 is a plan view, and FIG. 5 shows the inside of the engine cover 1. The plan sectional view and FIG. 6 are the same (the side sectional view and FIG. 7 are the same rear sectional view, FIG. 8 is a side view of the fuel tank 15 and hydraulic oil tank 16, and FIG. 9 is the front side of the lifting hook 8). 10 is a side view of the cooling intake port 39, FIG. 11 is a plan sectional view, and FIG. 12 is a rear sectional view of the upper vehicle body 2.
The figure is also a front view of the upper vehicle body 2. 1... Engine cover 2... Upper body 3... Exhaust expansion chamber... Exhaust duct... Lower body... Intake expansion chamber... Lifting hook... Air cleaner... Fuel tank... Hydraulic oil Tank...Crawler 2 traveling gear...Swivel base bearing...Battery...Seat...Drilling equipment Applicant Yanmar Diesel Co., Ltd. Agent Patent attorney Hisashi Yano Part No. A Figure 10 Figure No. ++ figure

Claims (3)

[Claims] (1) An excavation work vehicle equipped with a lower vehicle body 5, an upper vehicle body 2, an engine cover 1, and an excavator K, in which an engine E is disposed inside the engine cover 1, and the cooling air of the engine E is discharged downstream. This excavation work vehicle is characterized by having a wind duct 4 and an exhaust expansion chamber 3 arranged therein. (2) An excavation work vehicle according to claim (1), characterized in that an intake expansion chamber 7 is provided at a position opposite to the exhaust expansion chamber 3 with the engine E interposed therebetween. (3) Claim (2) is characterized in that an intake duct 13 is provided forward from the intake expansion chamber 7, and an intake opening 14 is opened at the front end of the upper vehicle body 2 with which the intake duct 13 communicates. Excavation work vehicle.