JP4864777B2 - Backhoe - Google Patents

Description

  The present invention relates to a backhoe of a type that cools an oil cooler and a radiator by sucking outside air with a radiator fan.

2. Description of the Related Art Conventionally, there is an engine horizontally disposed at the rear part of a swivel base, a radiator fan driven by the engine is disposed on one side of the engine, and a radiator and an oil cooler are disposed on one outer side of the radiator fan. A radiator tank is disposed, a fuel tank is disposed on the front side of the radiator chamber, and outside air is sucked from an intake port formed on a side cover on one side of the radiator chamber by driving the radiator fan. And the backhoe of the type which cools the said oil cooler and a radiator is known (refer patent document 1).
JP-A-9-95973

  The conventional backhoe has a wide space extending in the vertical and front-rear direction between the air inlet and the radiator formed on the side cover on one side and outside of the radiator chamber. When the air is sucked in, the phenomenon of being sucked into the radiator fan while accompanying the air in the radiator room immediately after the air intake occurs due to the suction of the outside air. A part of the fan shroud around the fan shroud and was sucked in, resulting in a problem that cooling efficiency was lowered. In particular, the hot air of the radiator exhaust tends to gather upward due to the difference in specific gravity. Therefore, the cooling efficiency is greatly reduced by the radiator exhaust that goes around the fan shroud.

  The present invention has been proposed in view of the above-described problems of conventional backhoes, and an object thereof is to provide a backhoe capable of improving the cooling efficiency of an oil cooler and a radiator.

In order to achieve the above object, the present invention has an engine disposed horizontally at the rear part of a swivel, a radiator fan driven by the engine is disposed on one side of the engine, and one side of the radiator fan A radiator chamber in which a radiator and an oil cooler are disposed on the outer side, a fuel tank is disposed on the front side of the radiator chamber, and a side cover on one outer side of the radiator chamber by driving of the radiator fan A backhoe that sucks outside air from an air inlet formed in the air and cools the oil cooler and the radiator,
Between the side cover and the front of the radiator, it sets an intake duct for introducing outside air toward the front of the radiator from the air inlet of the side cover to said radiator chamber,
The intake pipe of the air cleaner extends from the engine room into the intake duct through the upper partition plate that extends from the upper part of the radiator toward the side cover and forms the upper wall of the intake duct.
Introduced
The upper partition plate is divided into two front and rear at a through-hole forming position that penetrates the intake pipe, one of which is detachably attached to the upper portion of the radiator, and the other is detachably attached to the one upper partition plate. It is a feature.

According to this configuration, the intake duct can be efficiently introduced into the radiator while rectifying the outside air, and the radiator exhaust is prevented from being sucked again, so that the cooling efficiency of the oil cooler and the radiator is improved. Can do.
The intake duct has upper and lower partition plates, rear partition plates, and rear partition plates that extend toward the side cover at the upper and lower and rear portions of the radiator. The upper and lower partition plates, the rear partition plate, and the fuel tank It is characterized by being formed with the rear wall surface.

According to this configuration, the formation and attachment of the intake duct is facilitated and can be easily performed.
In addition, a frame support for supporting a bonnet constituting the engine room is provided, and the frame support is disposed at a front portion between the front surface of the radiator and the side cover and has a leg portion erected on the swivel base. The leg portion of the column passes through the upper partition plate of the intake duct, and the upper partition plate is divided into two at the positions where the intake pipe of the air cleaner and the through-hole of the frame column are formed. The lower partition plate which comprises is extended ahead so that the outer side of the leg part of the said frame support | pillar may wrap around .

According to this configuration, the upper partition plate can be easily detached from the upper portion of the radiator during inspection work and cleaning work between the oil cooler and the radiator, and attachment after work can be simplified. In particular, it is possible to keep divided the upper partition plate at the position of the through-hole of the member that is disposed through the upper partition plate (frame struts and air cleaner of the intake pipe, etc.), being hindered to these members The upper partition plate can be installed and removed freely.

The swivel has a counterweight attached over a range extending from the rear periphery to the rear half of the radiator chamber and to the lower side of the side cover, and the counterweight extends from the lower part of the radiator to the counterweight. It is characterized in that an intake opening is formed which extends toward the counterweight and is located above the lower partition plate constituting the lower wall of the intake duct and communicates with the intake duct of the radiator chamber.

  According to this configuration, even when the counterweight is attached over the range from the periphery of the rear of the swivel to the rear half of the radiator chamber, the intake opening is provided in the counterweight to the intake duct of the radiator chamber as described above. By forming them in communication, the passage area of the intake duct can be formed widely and straight without being blocked by the counterweight, and the intake efficiency can be improved. Further, since the counterweight is provided around the rear part of the swivel, when viewed from the driver's seat of the backhoe, it is below the rear part of the fuselage, and the intake opening formed in the counterweight is the rear half of the fuselage. Since the radiator fan noise moves away from the driver's ear position, the noise value is lowered.

  ADVANTAGE OF THE INVENTION According to this invention, the backhoe which enabled the improvement of the cooling efficiency of an oil cooler and a radiator can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a basic configuration of a backhoe targeted by the present invention will be described. In FIG. 12, reference numeral 1 denotes a backhoe. In the backhoe 1, a swivel base 3 is installed on a traveling body 2 so as to be turnable around a vertical axis P, and an excavation work device 4 is attached to the front part of the swivel base 3. Has been.
The traveling machine body 2 includes a pair of left and right crawler-type traveling bodies 2a driven by a hydraulic motor (not shown) on a traveling frame 2b, and a dozer 5 is provided at the front of the traveling frame 2b.

The swivel base 3 is supported on the upper part of the traveling frame 2b so as to be able to swivel around the vertical axis P via a swivel bearing Q, and can be swung by a swivel hydraulic motor (not shown) provided on the traveling frame 2b. .
A driver's seat 6 and a control device 7 are installed in the first half of the swivel base 3, and a canopy 8 or a cabin is provided above the driver's seat 6. A pair of upper and lower support brackets 3a projecting forward is provided slightly to the right of the center of the front of the swivel base 3, and a swing bracket 3b is supported on the support bracket 3a so as to swing left and right around the vertical axis 3c. It can be swung left and right by a swing cylinder (not shown) installed on the swivel base 3.

  The excavation work device 4 includes a boom 4a that is swingably supported around the horizontal axis by the swing bracket 3b, an arm 4b that is swingably supported around the horizontal axis at the tip side of the boom 4a, 4b, and a boom 4a, an arm 4b, and a bucket 4c, which are respectively provided by a boom cylinder 4d, an arm cylinder 4e, and a bucket cylinder 4f that are hydraulic cylinders. It is supposed to be operable.

  As shown in FIGS. 1, 2, 8, and 9, an engine 9 is disposed horizontally via a vibration isolating support member 10 at the rear of the swivel 3 and behind the driver's seat 6. A hydraulic pump 11 that is driven by the engine 9 and supplies pressure oil to various hydraulic devices is connected to the right side of the engine 9, and a radiator fan 12 that is driven by the engine 9 is connected to the left side of the engine 9. A radiator 13 and an oil cooler 14 are disposed on the front surface of the radiator fan 12 (on the left side of the swivel base 3).

As shown in FIGS. 1 to 7, the radiator 13 is formed in a rectangular box shape whose outer shape is substantially vertically long. The engine cooling water is introduced from the upper part, cooled by the blowing action of the radiator fan 12, and led out from the lower part. Pipe connection is made to return to 9.
As shown in FIGS. 2, 4, 7, and 8, the radiator 13 is supported on the swivel base 3 by support members 15 and 16 at an upper portion and a lower portion.

  As shown in FIGS. 2, 3, 5, 7, and 8, the oil cooler 14 has a substantially vertically long rectangular box shape whose outer shape is smaller than the vertical and horizontal dimensions of the radiator 13, and introduces hydraulic oil from above. The radiator fan 12 is cooled by the air blowing action, led out from the lower part, and returned to the hydraulic oil tank 17 (see FIG. 9). Is supported through.

  A partition wall 20 (see FIG. 9) is provided over the entire length in the left-right direction at the boundary between the rear portion of the swivel base 3 where the engine 9 is disposed and the front half of the swivel base 3 where the driver's seat 6 is disposed. ing. A room in which the engine 9 is installed is partitioned as an engine room 21 surrounded by a right side cover 22 and a rear cover 23 as shown in FIG. 2 and FIG. The upper part is covered with a bonnet 24 that can be opened and closed. The room in which the radiator 13 and the oil cooler 14 are installed is separated from the engine room 21 by a partition wall 27 (see FIGS. 7 to 9) as a radiator room 25 around the installation position of the fan shroud 26 of the radiator fan 12. ing.

The rear part of the swivel base 3 has a circular arc shape in plan view (see FIG. 1), and is configured as a small rear swivel backhoe so that it does not protrude beyond the left and right widths of the traveling machine body 2 even if the swivel base 3 turns. . A counterweight 28 that opposes the reaction force of the excavation work device 4 is attached around the rear of the swivel base 3.
A fuel tank 29 (see FIGS. 1, 4, and 8) is disposed on the front side of the radiator chamber 25 on the left side of the swivel base 3. On the front side of the hydraulic pump 11 on the right side of the swivel base 3, a vertically long hydraulic oil tank 17 (see FIG. 9) that stores hydraulic oil for operating hydraulic equipment is vertically partitioned and arranged by a partition wall 20. In front of the tank 17, a control valve (not shown) in which control valves for controlling each hydraulic device are stacked in a vertical direction is arranged upright via a support member. A battery (not shown) is installed in front of the hydraulic oil tank 17.

In the engine room 21, engine accessories and auxiliary equipment such as an ignition device (not shown), a carburetor (not shown), a starter (not shown), an alternator (not shown), an exhaust muffler 31, and an air cleaner 32 are arranged. (See FIGS. 8 and 9).
The hydraulic oil in the hydraulic oil tank 17 is led out by the hydraulic pump 11, supplied to each hydraulic device through the control valve, and returned to the hydraulic oil tank 17 through a return path. It is cooled and returned by the cooler 14. Therefore, hydraulic piping (not shown) is provided between the hydraulic oil tank 17 and the hydraulic pump 11, between the hydraulic pump 11 and the control valve, between the control valve and each hydraulic device, and between the control valve and the oil cooler 14. Connected with.

  The hydraulic pump 11 is composed of a dual pump, an auxiliary pump, and a pilot pump. The dual pump and the auxiliary pump are used to travel the traveling machine body 2, rotate the swivel 3, and each hydraulic device of the excavation work device 4. The pressure oil required for the operation of the dozer 5 is supplied, and the pilot pump supplies the pilot pressure oil required for the control operation of the control valve.

  Exhaust gas from the engine 9 is guided to an exhaust muffler 31 through an exhaust pipe, is silenced in the exhaust muffler 31, and is exhausted from the rear lower part to the outside by a tail pipe 34. In the middle of the tail pipe 34, an after muffler 35 is provided. The after muffler 35 is provided to further reduce the exhaust sound level by attenuating the noise component energy that cannot be completely silenced by the exhaust muffler 31 alone.

  As shown in FIGS. 1 to 8, the backhoe 1 according to the present invention radiates outside air from the air inlet 43 of the side cover 42 toward the front surface of the radiator 13 between the front surface of the radiator 13 and the left side cover 42. An intake duct 44 for introduction is provided separately in the radiator chamber 25. As shown in FIG. 10, a net 43a for dustproofing, insectproofing, etc. is stretched at the air inlet 43 of the side cover 42.

As shown in FIGS. 1 to 8, the intake duct 44 has an upper partition plate 45, a lower partition plate 46, and a rear partition plate 47 that extend toward the side cover 42 at the upper and lower portions and the rear portion of the radiator 13. The upper and lower partition plates 45, 46, the rear partition plate 47, the rear wall surface of the fuel tank 29 and the upper partition wall 30 are formed.
The upper and lower partition plates 45 and 46 are made of a planar plate material that approximates the planar shape of the radiator chamber 25. In addition, the planar shape of the radiator chamber 25 is a rectangle that is long in the front and rear direction so as to follow the arc shape of the left half of the left side of the swivel base 3 as the rear part of the swivel base 3 has an arc shape in plan view. The left side is deformed as an arcuate side that approaches the right side from the middle in the front-rear direction toward the right side.

  As shown in FIGS. 7 and 8, the upper partition plate 45 has a two-part structure, and one 45a is detachably attached to the upper portion of the radiator 13 via attachment members 48 and 48, and the other 45b is divided into the one 45a. The parts are overlapped at a position and are detachably attached by a fastening member 49 such as a bolt. The division position is a position where a through-hole is formed in the frame post 50 that supports the bonnet 24 and the intake pipe 51 of the air cleaner 32. The frame support 50 is formed in a substantially gate shape by a pipe material, and both gate-shaped leg portions are erected and fixed on both sides of the swivel base 3 in the left-right direction. The intake pipe 51 of the air cleaner 32 is introduced from the engine room 21 into the intake duct 44 in the radiator chamber 25 and is opened. The other 45 b of the upper partition plate 45 is also supported by the upper partition wall 30 on the rear wall surface of the fuel tank 29 via a support member 52.

Further, as shown in FIG. 10, the swivel base 3 has a counterweight 28 attached over a range from the periphery of the rear part to the second half side surface of the radiator chamber 25. The counterweight 28 includes the counterweight 28. An intake opening 53 that communicates with the intake duct 44 of the chamber 25 is formed.
Embodiment of the backhoe 1 which concerns on this invention consists of the above structure, and demonstrates the operation | movement next.

The backhoe 1 according to the present invention can be efficiently introduced into the radiator 13 while rectifying the outside air by the intake duct 44 and is prevented from sucking the radiator exhaust again, so that the oil cooler 14 and the radiator 13 are cooled. Efficiency can be improved.
In addition, an upper partition plate 45, a lower partition plate 46, and a rear partition plate 47 that extend toward the side cover 42 are attached to the upper and lower portions and the rear portion of the radiator 13, and the upper and lower partition plates 45 and 46 are connected to the rear portion. Since the partition plate 47 and the rear wall surface of the fuel tank 29 are formed, the intake duct 44 can be easily formed and attached, and can be easily implemented.

  Further, the upper partition plate 45 has a two-part structure, and one side 45a is detachably attached to the upper portion of the radiator 13 via attachment members 48, 48, and the other 45b is partially overlapped with the one 45a at the division position so as to be bolts or the like. Since the fastening member 49 is detachably attached, the upper partition plate 45 can be easily removed by dividing the upper partition plate 45 from the upper portion of the radiator 13 during inspection work and cleaning work between the oil cooler 14 and the radiator 13. Later installation can be simplified. In particular, these members are obtained by dividing the upper partition plate 45 at the positions of the through holes of the members (for example, the frame column 50 and the intake pipe 51 of the air cleaner 32) disposed through the upper partition plate 45. The upper partition plate 45 can be freely attached and detached without being obstructed by the above.

  Further, an intake opening 53 that communicates with the intake duct 44 of the radiator chamber 25 is formed in the counterweight 28 that is attached over the range from the rear periphery of the swivel base 3 to the rear side surface of the radiator chamber 25. Therefore, the passage area of the intake duct 44 can be formed wide and straight without being interrupted by the counterweight 28, and the intake efficiency can be improved. Further, since the counterweight 28 is provided around the rear portion of the swivel base 3, when viewed from the driver's seat 6 of the backhoe 1, the counterweight 28 is located below the rear portion of the fuselage, and the intake opening formed in the counterweight 28. 53 is the lower side of the rear half of the fuselage, and the noise of the radiator fan 12 moves away from the driver's ear position, so the noise value decreases.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can be implemented with appropriate modifications.

It is a top view which shows the arrangement configuration of the principal part of this invention in a backhoe swivel base. It is a rear view of the backhoe swivel of FIG. It is a left view of the backhoe swivel of FIG. FIG. 2 is an enlarged plan view of a rear left half portion of the backhoe swivel base in FIG. 1. FIG. 3 is an enlarged rear view of the left side of the backhoe swivel of FIG. 2. It is an enlarged plan view which shows arrangement | positioning of the lower partition plate of the intake duct of the left side rear part of the backhoe swivel of FIG. It is an expansion perspective view which shows the state which has arrange | positioned the intake duct in the radiator chamber of the backhoe swivel base of FIG. It is the perspective view seen from the left back of the radiator room and engine room part of the backhoe swivel base of FIG. It is the perspective view which looked at the engine room part of the backhoe swivel of FIG. 1 from the right rear. It is the perspective view seen from the left rear of the backhoe swivel of FIG. It is the perspective view seen from the back right of the backhoe swivel of FIG. It is a side view which shows the fundamental structure of the backhoe which this invention makes object.

DESCRIPTION OF SYMBOLS 3 Swivel base 4 Excavation work apparatus 9 Engine 10 Anti-vibration support member 11 Hydraulic pump 12 Radiator fan 13 Radiator 14 Oil cooler 17 Hydraulic oil tank 21 Engine room 25 Radiator room 26 Fan shroud 28 Counterweight 29 Fuel tank 31 Exhaust muffler 34 Tail pipe 35 After muffler 42 Left side cover 43 Intake port 44 Intake duct 45 Upper partition plate 46 Lower partition plate 47 Rear partition plate 53 Inlet opening

Claims (4)

The engine is disposed horizontally at the rear of the swivel base, a radiator fan driven by the engine is disposed on one side of the engine, and a radiator and an oil cooler are disposed on the outer side of the radiator fan. A radiator tank, a fuel tank is disposed on the front side of the radiator chamber, and outside air is sucked from an intake port formed on a side cover on one outer side of the radiator chamber by driving of the radiator fan. A backhoe for cooling the oil cooler and the radiator,
Between the side cover and the front of the radiator, it sets an intake duct for introducing outside air toward the front of the radiator from the air inlet of the side cover to said radiator chamber,
Extending from the upper part of the radiator toward the side cover and passing through the upper partition plate constituting the upper wall of the intake duct, the intake pipe of the air cleaner is introduced into the intake duct from the engine room,
The upper partition plate is divided into two front and rear at a through-hole forming position that penetrates the intake pipe, one of which is detachably attached to the upper portion of the radiator, and the other is detachably attached to the one upper partition plate. A featured backhoe.   An upper partition plate, a lower partition plate, and a rear partition plate extending toward the side cover are attached to the upper and lower portions and the rear portion of the radiator, and the intake air is formed by the upper and lower partition plates, the rear partition plate, and the rear wall surface of the fuel tank. The backhoe according to claim 1, wherein a duct is formed. A frame support for supporting a bonnet constituting the engine room is provided, and the frame support is disposed at a front portion between the front surface of the radiator and the side cover and has a leg portion standing on a swivel base. The leg portion penetrates the upper partition plate of the intake duct, and the upper partition plate is divided into two at the positions where the intake pipe of the air cleaner and the through-hole of the frame column are formed, forming the lower wall of the intake duct backhoe according to claim 1 or 2 lower partition plate is characterized in that it extends forward so as to go around the outer side of the leg portion of the frame struts. The swivel has a counterweight attached over a range from the rear periphery to the rear side surface of the radiator chamber and the lower side of the side cover, and the counterweight is connected to the counterweight from the lower portion of the radiator. 2. An air intake opening that is located above the lower partition plate that forms the lower wall of the air intake duct and that communicates with the air intake duct of the radiator chamber is formed. The backhoe according to any one of -3.

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