JP6850753B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle.

In Patent Document 1 below, as a technique for improving the cooling performance of a cooler and an engine and reducing noise, a horizontal engine having a hydraulic pump and one of an oil cooler and a radiator provided in front of the engine are the first. One cooler and the other second cooler of the oil cooler and the radiator are provided, and the first cooler, the engine, the hydraulic pump, and the discharge port are arranged in order on the crankshaft of the engine at the rear end. The fuel tanks and hydraulic oil tanks are arranged in approximately rows with an interval in the vehicle width direction with respect to the engine, and the cooling air after passing through the first cooler and the second cooler is merged. The technology for discharging from the discharge port is disclosed.

In Patent Document 2 below, a fan, an engine, and an exhaust gas treatment device are arranged in this order from one side to the other in the left-right direction of the machine as a technique for achieving both smooth discharge of cooling air and reduction of noise. In a construction machine, a technique is disclosed in which an exhaust port is formed below an exhaust gas treatment device on at least one of a front wall and a rear wall of an engine room to discharge cooling air.

Japanese Unexamined Patent Publication No. 11-324014 JP-A-2017-36538

However, in Patent Document 1, since the transverse engine and the discharge port installed on the side surface of the engine room are arranged side by side on the crankshaft of the engine, the noise caused by the engine is directly discharged from the discharge port to the outside. There is a problem that it will be released. Further, in Patent Document 2, since the discharge port is arranged on at least one of the front wall and the rear wall of the engine room, the noise leakage is smaller than that of the discharge port installed on the side surface of the engine room, but the noise source. The length of the flow path from the engine to the outlet is not sufficient to dampen the noise.

Therefore, in view of the above problems, an object of the present invention is to provide a work vehicle capable of reducing engine noise.

The work vehicle of the present invention includes a transverse engine arranged at the rear of the upper swing body and a horizontal engine.
With the cooling fan connected to the engine,
A heat exchanger arranged to face the cooling fan,
A hydraulic pump connected to the engine on the opposite side of the cooling fan,
A duct that is arranged in front of the hydraulic pump and extends in the front-rear direction with the bottom surface of the hydraulic oil tank or fuel tank as the top surface.
It is provided with a discharge port provided in a space communicating with the front portion of the duct.

In the present invention, the engine, the cooling fan, the heat exchanger, the hydraulic pump, and the duct are arranged in the engine room.
The outlet may be formed on the side wall of the engine room.

In the present invention, the hydraulic oil tank and the fuel tank may be arranged side by side in the front-rear direction of the upper swing body.

According to the present invention, since the duct extending forward from the rear part of the upper swing body in which the engine is arranged is provided, the path from the exhaust port to the outside of the cooling air becomes long, and the noise generated by the engine is heard. It can be effectively damped and engine noise can be reduced.

It is a side view which shows the work vehicle which concerns on this embodiment. It is a top view which shows typically the inside of the engine room of a work vehicle. It is a side view which shows typically the inside of the engine room of a work vehicle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the schematic structure of the backhoe 1 as an example of the work vehicle will be described with reference to FIG. However, the work vehicle is not limited to the backhoe 1, and may be another vehicle such as a wheel loader. The backhoe 1 includes a lower traveling body 11, a working machine 12, and an upper rotating body 13.

The lower traveling body 11 receives power from the engine 3 housed in the engine room 2 and drives the lower traveling body 11 to drive the backhoe 1. The lower traveling body 11 includes a pair of left and right crawlers 11a and 11a and a pair of left and right traveling motors 11b and 11b. The left and right traveling motors 11b and 11b, which are hydraulic motors, drive the left and right crawlers 11a and 11a, respectively, to enable the backhoe 1 to move forward and backward. Further, the lower traveling body 11 is provided with a blade 11c and a blade cylinder 11d for rotating the blade 11c in the vertical direction.

The work machine 12 is driven by receiving power from the engine 3 to perform excavation work such as earth and sand. The work machine 12 includes a boom 12a, an arm 12b, and a bucket 12c, and by driving these independently, excavation work is possible. The boom 12a, arm 12b, and bucket 12c each correspond to a working portion, and the backhoe 1 has a plurality of working portions.

One end of the boom 12a is supported by the front portion of the upper swing body 13, and the boom 12a is rotated by a boom cylinder 12d that can be expanded and contracted. Further, one end of the arm 12b is supported by the other end of the boom 12a, and the arm 12b is rotated by an arm cylinder 12e that can be expanded and contracted. Then, one end of the bucket 12c is supported by the other end of the arm 12b, and the bucket 12c is rotated by a bucket cylinder 12f that can be expanded and contracted.

The upper swivel body 13 is configured to be swivelable with respect to the lower traveling body 11 via a swivel bearing (not shown). A control unit 13a, an engine 3, a swivel base 13b, a swivel motor 13c, and the like are arranged on the upper swivel body 13. The upper swing body 13 swivels via a swivel bearing (not shown) by the driving force of the swivel motor 13c, which is a hydraulic motor. Further, the upper swing body 13 is provided with a hydraulic pump 4 driven by the engine 3. The hydraulic pump 4 supplies hydraulic oil to each hydraulic motor and each cylinder.

A driver's seat 131 is arranged in the control unit 13a. A pair of work operation levers 132 and 132 are arranged on the left and right sides of the driver's seat 131, and a pair of traveling levers 133 and 133 are arranged in front of the cockpit 131. The operator controls the engine 3, each hydraulic motor, each hydraulic cylinder, etc. by operating the work operation levers 132, 132, the traveling levers 133, 133, etc. while sitting on the cockpit 131, and travels, turns, and works. Etc. can be performed.

Next, the internal arrangement of the engine room 2 will be described with reference to FIGS. 2 and 3. The upper swivel body 13 is provided with a control portion 13a at the left front portion and an engine room 2 from the right front portion to the rear portion.

The backhoe 1 includes an engine 3, a cooling fan 3a, a hydraulic pump 4, a heat exchanger 5, and a tank 6 in an engine room 2. Further, the engine room 2 includes an intake port 2a for taking in cooling air from the outside of the engine room 2 and an exhaust port 2b for discharging the cooling air from the engine room 2.

The engine 3 is a so-called transverse engine in which the crankshaft is arranged in the lateral direction (horizontal direction in FIG. 2) of the upper swing body 13. The engine 3 is arranged in the central portion of the rear portion of the upper swing body 13. Electrical components (not shown) are provided around the engine 3. The electrical components include, for example, a generator (alternator), a pressure sensor, an electronic control unit, and the like.

The cooling fan 3a is connected to one end side of the crankshaft of the engine 3. The cooling fan 3a rotates due to the rotation of the crankshaft to generate cooling air toward the engine 3. The cooling fan 3a generates an air flow from the intake port 2a toward the discharge port 2b. As a result, low-temperature air (outside air) is taken in from the intake port 2a, and high-temperature air is exhausted from the exhaust port 2b.

The hydraulic pump 4 is connected to the other end side of the crankshaft of the engine 3 on the opposite side of the cooling fan 3a. A plurality of hydraulic pumps 4 may be provided.

The heat exchanger 5 cools water or oil circulating inside by exchanging heat with air circulating outside. The heat exchanger 5 is arranged so as to face the front surface of the cooling fan 3a. The heat exchanger 5 of the present embodiment includes a radiator 51 for cooling the cooling water of the engine 3 and an oil cooler 52 for cooling the hydraulic oil. In the present embodiment, the radiator 51 and the oil cooler 52 are arranged side by side in the lateral direction (horizontal direction in FIG. 2) of the upper swing body 13.

The tank 6 stores a liquid, and includes a hydraulic oil tank 61 for storing hydraulic oil or a fuel tank 62 for storing fuel. In the present embodiment, the hydraulic oil tank 61 and the fuel tank 62 are arranged side by side in the front-rear direction (left-right direction in FIG. 3) of the upper swing body 13.

A control valve chamber 7 is provided in front of the tank 6. A control valve 7a is arranged in the control valve chamber 7. The control valve 7a switches the direction and flow rate of the hydraulic oil supplied from the hydraulic pump 4 to each hydraulic motor and each hydraulic cylinder. A discharge port 2b is formed on the left side wall of the control valve chamber 7.

An exhaust gas aftertreatment device 8 is provided above the hydraulic pump 4. The exhaust gas aftertreatment device 8 treats the exhaust gas from the engine 3, and the treated exhaust gas passes through an exhaust gas pipe (not shown) protruding upward from the upper surface of the engine room 2 to the outside of the engine room 2. Is discharged to.

As shown in FIG. 3, the tank 6 is arranged with a gap between it and the bottom surface of the engine room 2. As a result, a duct 9 composed of an outer bottom surface of the tank 6 (hydraulic oil tank 61, fuel tank 62) and an inner side surface and an inner bottom surface of the engine room 2 is formed. The duct 9 extends in the front-rear direction of the upper swing body 13 in front of the hydraulic pump 4. Further, the duct 9 communicates with the control valve chamber 7.

In the present embodiment, the radiator 51, the oil cooler 52, the cooling fan 3a, the engine 3, the hydraulic pump 4, the exhaust gas aftertreatment device 8, the hydraulic oil tank 61, the fuel tank 62, from the intake port 2a to the discharge port 2b, The control valves 7a are arranged in this order. Since the cooling fan 3a generates an air flow from the intake port 2a to the exhaust port 2b, the air is the radiator 51, the oil cooler 52, the cooling fan 3a, the engine 3, the hydraulic pump 4, and the exhaust gas aftertreatment device 8. , The hydraulic oil tank 61, the fuel tank 62, and the control valve 7a in this order. In addition, in FIG. 2 and FIG. 3, the flow of air is indicated by an arrow.

In the present embodiment, since the duct 9 extending forward from the rear part of the upper swing body 13 in which the engine 3 is arranged is provided, the path from the discharge port 2b to the outside of the engine room 2 becomes long. , The sound generated by the engine 3 can be effectively attenuated in the engine room 2, and the noise of the engine 3 can be reduced.

Further, in the present embodiment, since the air passage for the air taken in from the intake port 2a to the discharge port 2b via the duct 9 is appropriately formed, the electrical components and the like caused by the temperature rise due to the retention of the air. It is possible to prevent the failure of. Further, cooling of the hydraulic oil can be promoted by applying cooling air to the bottom surface of the hydraulic oil tank 61.

[Other Embodiments]
(1) In the above-described embodiment, an example in which the hydraulic oil tank 61 and the fuel tank 62 are arranged side by side in the front-rear direction is shown, but the present invention is not limited to this. For example, the hydraulic oil tank 61 and the fuel tank 62 may be arranged side by side in the horizontal direction, or may be arranged so as to be overlapped in the vertical direction. However, the duct 9 can be lengthened by arranging the hydraulic oil tank 61 and the fuel tank 62 side by side in the front-rear direction.

(2) In the above-described embodiment, the discharge port 2b is formed on the side wall of the control valve chamber 7 (the side wall of the engine room 2), but the present invention is not limited to this. The discharge port 2b may be formed on the front wall of the control valve chamber 7 (front wall of the engine room 2). However, by providing the discharge port 2b on the side wall of the control valve chamber 7, the number of times the sound is reflected until reaching the discharge port 2b is increased, so that the noise reduction effect is large.

Although the embodiments of the present invention have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is shown not only by the description of the above-described embodiment but also by the scope of claims, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

1 Back ho 13 Upper swivel body 2 Engine room 2a Intake port 2b Discharge port 3 Engine 3a Cooling fan 4 Hydraulic pump 5 Heat exchanger 51 Radiator 52 Oil cooler 6 Tank 61 Hydraulic oil tank 62 Fuel tank 9 Duct

Claims (4)

With a transverse engine located at the rear of the upper swing body,
With the cooling fan connected to the engine,
A heat exchanger arranged to face the cooling fan,
A hydraulic pump connected to the engine on the opposite side of the cooling fan,
A duct that is arranged in front of the hydraulic pump and extends in the front-rear direction with the bottom surface of the hydraulic oil tank or fuel tank as the top surface.
A discharge port provided in a space communicating with the front portion of the duct is provided .
The engine, the cooling fan, the heat exchanger, the hydraulic pump, and the duct are arranged in the engine room.
The outlet is formed on the wall of the engine room.
A work vehicle in which the discharge port is provided at a position deviated from a position facing the duct in the front-rear direction. The work vehicle according to claim 1, wherein the wall of the engine room provided with the discharge port is a side wall parallel to the front-rear direction. The work vehicle according to claim 2, wherein the discharge port faces a control unit arranged in front of the engine of the upper swing body. A control valve chamber in which a control valve is arranged is provided in the engine chamber.
The hydraulic oil tank and the fuel tank are arranged side by side in the front-rear direction of the upper swing body .
The work vehicle according to any one of claims 1 to 3, wherein the discharge port is formed on a wall constituting the work tank and the control valve chamber provided in front of the fuel tank.

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