JP7206944B2 - construction machinery - Google Patents

Description

The present invention relates to an intake structure for construction machinery such as cranes.

As this type of technology, there is one described in Patent Document 1, for example. The air intake structure described in FIGS. 2 and 3 of Patent Document 1 has openings on the upper and lower sides of the rear end of a guard that surrounds the fan and the heat exchanger, and takes in outside air through these openings. is. Further, in paragraph 0049 of Patent Document 1 and FIG. 9, it is possible to provide an opening at the rear end of the guard (directly behind the heat exchanger) and arrange a sound absorbing louver with an L-shaped cross section in this opening. Have been described.

JP 2017-210929 A

The intake structure described in Patent Document 1 has the following points to be improved.
First, in order to efficiently apply cooling air to the heat exchanger, an air intake structure that takes in outside air from the rear diagonally above or rearward diagonally below the heat exchanger as described in FIGS. 2 and 3 of Patent Document 1 is used. basically unsuitable. In addition, the high-temperature exhaust gas from the engine is generally discharged upward through the exhaust pipe. There is a concern that a large amount of inappropriate exhaust gas will be taken in.

On the other hand, the intake structure described in FIG. 9 of Patent Document 1 is an intake structure that takes in outside air from an opening provided at the rear end of the guard surrounding the fan and the heat exchanger (directly behind the heat exchanger). Although there is no such problem from the viewpoint of the direction of taking in the outside air, air resistance is large in the flow path leading to the opening where the sound absorbing louver is arranged, making it difficult to take in the outside air. As a result, it is difficult for the cooling air to efficiently hit the heat exchanger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a construction machine having an air intake structure that allows cooling air to more easily hit a heat exchanger.

A construction machine according to the present invention comprises an upper frame having a box-shaped structure, an engine arranged inside the upper frame, and a fan connected to the engine, wherein the fan is inside the upper frame and on the rear side of the engine. a fan located inside the upper frame and behind the fan; and a duct for taking in outside air, the duct being located inside the upper frame and behind the heat exchanger. and a louver arranged inside the duct, wherein the louver changes the flow of the outside air taken in from the opening by the rotation of the fan so that the outside air flows toward the heat exchanger. and a guard surrounding the engine, the fan, the heat exchanger and the duct, the guard being attached to the upper frame.

According to the present invention, the duct and the louver among the above structures make it easier for outside air taken in by the rotation of the fan to hit the heat exchanger as cooling air.

1 is a plan view of a construction machine according to one embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1;

An embodiment for carrying out the present invention will be described below with reference to the drawings. A construction machine of the present invention is, for example, a mobile crane. 1 and 2 illustrate one embodiment of the invention. The construction machine 1 includes an upper frame 2, a cab 4 forming a cab, a winch 12, an engine 13, a counterweight 3, and the like.

The upper frame 2 is rotatably mounted on a lower traveling body (not shown) via a turning device (not shown). The upper frame 2 includes a pair of left and right main frames 3 forming side walls, a front end frame 4 connecting the front ends of the pair of left and right main frames 3, and a rear end frame 5 connecting the rear ends. Prepare. Further, the middle portions of the pair of left and right main frames 3 are connected by lateral beam members 6 and 7 . For example, in this way the upper frame 2 is of box-like construction.

A boom support portion 8 is attached to the front surface of the front end frame 4, and the base end portion of a boom (not shown) as a hoisting member is rotatably attached to the boom support portion 8. As shown in FIG. A mast support portion 9 is attached to the upper surface of the front end frame 4, and a base end portion of a mast (not shown) as a lifting member is rotatably attached to the mast support portion 9. As shown in FIG. Also, the cab 4 is attached to one end portion of the front end frame 4 in the width direction via a member 10 .

A lower spreader support member 11 is attached to the upper surface of the rear end frame 5, and a lower spreader (not shown) is attached to the lower spreader support member 11. As shown in FIG. A wire rope (not shown) is wound around the lower spreader and a sheave (pulley) provided at the tip of the mast. undulate. The boom is raised and lowered by the elevation of the mast.

Also, the counterweights 3 are arranged on both sides of the rear end of the main frame 3 to balance the suspended load.

The engine 13 is arranged in the rear portion inside the upper frame 2 . A hydraulic pump (not shown) is connected to the engine 13, and this hydraulic pump is rotated by the engine 13 to supply pressurized oil to various hydraulic equipment such as the hydraulic drive system of the winch 12 and the hydraulic drive system of the undercarriage. send. A fan 14 is connected to the engine 13 via an output shaft 13a. The fan 14 is arranged inside the upper frame 2 and behind the engine 13 . The inside of the upper frame 2 means a portion surrounded by a pair of left and right main frames 3, a front end frame 4, a rear end frame 5, and the like. Since a space S for laying various pipes (not shown) is required below the engine 13, the engine 13 is arranged slightly upward in order to secure this space S. High-temperature exhaust gas from the engine 13 is discharged upward from the upper frame 2 through an exhaust pipe (not shown).

A heat exchanger 15 is arranged behind the fan 14 . The heat exchanger 15 is a heat exchanger for cooling water or oil, such as a radiator, an oil cooler, and an intercooler, and is arranged inside the upper frame 2 .

A duct 16 for taking in outside air is arranged inside the upper frame 2 and behind the heat exchanger 15 , and a louver 19 is arranged inside an opening 16 a at the rear end of the duct 16 . The louver 19 changes the flow of outside air so that the outside air taken in from the opening 16a by the rotation of the fan 14 is directed toward the heat exchanger 15. A plurality of plate-like bodies 19a are arranged in parallel in the vertical direction. ~19d. The plurality of plate-like bodies 19a to 19d, which are arranged at predetermined intervals, are inclined upward toward the front (toward the heat exchanger 15).

The duct 16 has, in order from the rear, a first duct portion 17 in which a louver 19 is arranged, and a second duct portion 18 whose upper end is higher than the first duct portion 17 . The vertical dimension H2 of the second duct portion 18 is greater than the vertical dimension H1 of the first duct portion 17 . Further, the vertical center C1 of the first duct portion 17 is lower than the vertical center C2 of the engine 13 .

The duct 16 is detachably attached to the upper frame 2 , and the louver 19 is detachably attached to the duct 16 or the upper frame 2 .

Further, guard plates 20, 21, 22, etc. are attached to the upper frame 2 as guards covering the openings of each part, and the engine 13, the fan 14, the heat exchanger 15, and the duct 16 are connected to the It is surrounded by guard plates 20 and 22 .

The fan 14, the duct 16, and the louvers 19 constitute an intake structure, which functions as follows.

When the engine 13 is driven, the fan 14 rotates, and outside air (air) flows into the duct 16 from the opening 16 a at the rear end of the duct 16 . Most of the air that has flowed into the duct 16 changes its direction of flow obliquely upward at the louvers 19 and goes toward the heat exchanger 15 . There is also a flow of air toward the heat exchanger 15 without changing the direction of the flow so much, such as the air that has flowed into the lower end of the opening 16a. The air hits the heat exchanger 15 and the oil and water flowing inside the heat exchanger 15 are cooled.

The intake structure having the above configuration has the following functions and effects.
By arranging the duct 16 for taking in outside air (air) behind the heat exchanger 15 , the outside air is smoothly guided to the heat exchanger 15 . Further, by arranging the louvers 19 that change the flow of outside air inside the duct 16 , it is possible to apply air to the entire heat exchanger 15 by the louvers 19 . In addition, due to the existence of the louver 19, the opening area of the opening 16a of the duct 16 when viewed from directly behind becomes small (because the heat exchanger 15 is not completely visible), so that the noise generated by the engine 13 or the like can be eliminated. Leakage from the portion 16a to the outside can be suppressed. Furthermore, since outside air is taken in directly behind the upper frame 2 , high-temperature exhaust gas from the engine 13 is less likely to be taken into the duct 16 .

By arranging the louver 19 inside and behind the duct 16, it is possible to provide an appropriate gap between the louver 19 and the heat exchanger 15, making it easier to apply air to the entire heat exchanger 15. .

By detachably attaching the duct 16 to the upper frame 2, the construction machine 1 can be assembled such as mounting the engine 13 on the upper frame 2 with the duct 16 attached to the upper frame 2. The assemblability of the construction machine 1 is improved. Further, since the duct 16 and the engine 13 are not connected, it is possible to suppress transmission of the vibration of the engine 13 to the duct 16, and to suppress damage to the duct 16 due to the vibration of the engine 13. - 特許庁

In addition to the duct 16, the louver 19 is also detachable. The inner surface of the duct 16 and the surfaces of the plates 19a to 19d forming the louver 19 are covered with a sound absorbing material (not shown). easy to do. In addition, a worker can enter the upper frame 2 through the opening 16a to perform maintenance (cleaning, etc.) of the heat exchanger 15, and maintainability of the heat exchanger 15 is also improved.

The duct 16 has a first duct portion 17 and a second duct portion 18 whose upper end is higher than the first duct portion 17 in order from the rear, thereby avoiding the rear end frame 5 constituting the upper frame 2. can be arranged.

Since the vertical center C<b>1 of the first duct portion 17 is lower than the vertical center C<b>2 of the engine 13 , high-temperature exhaust gas from the engine 13 is less likely to be taken in.

Since the louver 19 is composed of a plurality of plate-like bodies 19a to 19d arranged in parallel in the vertical direction, the louver 19 can be easily manufactured.

The above embodiment can be modified as follows.
The duct 16 may be removably attached to the guard plates 20,22.

Instead of the rear portion inside the duct 16 , the louver 19 may be arranged inside the front portion inside the duct 16 , for example, inside the second duct portion 18 that constitutes the duct 16 .

The number of plates 19a to 19d forming the louver 19 is not limited to four, and may be three or less, or may be five or more.

The engine 13 may be arranged inside the upper frame 2 and below it.

The inner surface of the duct 16 and the surfaces of the plate-like members 19a to 19d forming the louver 19 may not be covered with the sound absorbing material.

Although the embodiments of the present invention have been described above, it is needless to say that various other modifications can be made within the scope of those skilled in the art.

1: construction machine 2: upper frame 13: engine 14: fan 15: heat exchanger 16: duct 17: first duct part 18: second duct part 19: louvers 19a to 19d: plate-like body 20: guard plate (guard )
22: Guard plate (guard)
C1: Vertical center of the first duct C2: Vertical center of the engine

Claims (7)

an upper frame of box-like structure;
an engine disposed inside the upper frame;
a fan connected to the engine, the fan located inside the upper frame and behind the engine;
a heat exchanger located inside the upper frame and behind the fan;
a duct for taking in outside air, the duct being arranged inside the upper frame and behind the heat exchanger;
a louver disposed inside the duct, the louver changing the flow of the outside air taken in from the opening by the rotation of the fan so that the outside air flows toward the heat exchanger;
a guard enclosing the engine, the fan, the heat exchanger, and the duct, the guard being attached to the upper frame;
construction equipment. In the construction machine according to claim 1,
Construction equipment, wherein the louver is arranged at the rear inside the duct. The construction machine according to claim 1 or 2,
Construction equipment, wherein the duct is removably attached to the upper frame. In the construction machine according to any one of claims 1 to 3,
Construction equipment, wherein the louver is removably attached to the duct . In the construction machine according to any one of claims 1 to 4,
The construction machine, wherein the duct has, in order from the rear, a first duct portion in which the louver is arranged, and a second duct portion whose upper end is higher than the first duct portion. In the construction machine according to claim 5,
exhaust gas from the engine is discharged upwardly of the upper frame;
The construction machine, wherein the vertical center of the first duct portion is lower than the vertical center of the engine. In the construction machine according to any one of claims 1 to 6,
The construction machine, wherein the louver is composed of a plurality of plate-like bodies vertically arranged in parallel.

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