JP2020118072A - Construction machine - Google Patents

Abstract

To provide a construction machine including an intake structure for allowing cooling air to more easily hit a heat exchanger.SOLUTION: A construction machine 1 includes a fan 14 arranged inside an upper frame 2 on the rear side of an engine 13, a duct 16 for taking in outside air, the duct 16 being arranged inside the upper frame 2 on the rear side of a heat exchanger 15, and a louver 19 arranged inside the duct 16, the louver 19 serving for changing the flow of the outside air so that the outside air taken in from an opening 16a with the rotation of the fan 14 moves to the heat exchanger 15, the engine 13, the fan 14, the heat exchanger 15, and the duct 16 being encircled by guard plates (guards) 20, 22.SELECTED DRAWING: Figure 2

Description

The present invention relates to an intake structure for a construction machine such as a crane.

An example of this type of technology is described in Patent Document 1. In the intake structure shown in FIGS. 2 and 3 of Patent Document 1, openings are provided above and below the rear end of the guard that surrounds the fan and the heat exchanger, and the outside air is taken in through the openings. Is. In paragraph 0049 of FIG. 9 of Patent Document 1, an opening is provided at the rear end of the guard (right behind the heat exchanger), and a sound absorbing louver having an L-shaped cross section is arranged in the 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 the cooling air to the heat exchanger, an intake structure that takes in outside air from the rear upper diagonal side or the rear lower diagonal side of the heat exchanger, as described in FIGS. Basically not suitable. In addition, high-temperature exhaust gas from the engine is generally exhausted upward through the exhaust pipe, and if the structure takes in outside air from diagonally above and behind the heat exchanger, it will cool the heat exchanger. There is concern that a large amount of inappropriate exhaust gas may 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 that surrounds the fan and the heat exchanger (right behind the heat exchanger). The above problem does not occur from the viewpoint of the direction of taking in the outside air, but the air resistance is large in the flow path to the opening where the sound absorbing louver is arranged, and it is difficult to take in the outside air. As a result, it is difficult for the cooling air to hit the heat exchanger efficiently.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a construction machine including a heat exchanger having an intake structure in which cooling air is more likely to hit.

A construction machine according to the present invention comprises a box-shaped upper frame, an engine arranged inside the upper frame, and a fan connected to the engine, the inside of the upper frame and the rear side of the engine. A fan arranged in the upper frame, a heat exchanger arranged inside the upper frame and behind the fan, and a duct for taking in outside air, which is inside the upper frame and on the rear side of the heat exchanger. A louver disposed inside the duct and a louver disposed inside the duct, the louver changing the flow of the outside air so that the outside air taken in through the opening by the rotation of the fan is directed to 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, in particular, the duct and the louver of the above configuration make it easier for the outside air taken in by the rotation of the fan to hit the heat exchanger as cooling air.

It is a top view of the construction machine concerning one embodiment of the present invention. It is an AA sectional view of FIG.

Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. The construction machine of the present invention is, for example, a mobile crane. 1 and 2 show an embodiment of the present invention. The construction machine 1 includes an upper frame 2, a cab 4 that constitutes a driver's 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 that form sidewalls, a front end frame 4 that connects the front end portions of the pair of left and right main frames 3 and a rear end frame 5 that connects the rear end portions. Prepare Further, the middle portions of the pair of left and right main frames 3 are connected by the lateral beam members 6 and 7. For example, in this way, the upper frame 2 has a box-shaped structure.

A boom support portion 8 is attached to the front surface of the front end frame 4, and a base end portion of a boom (not shown) as an undulating member is rotatably attached to the boom support portion 8. Further, 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 an undulating member is rotatably attached to the mast support portion 9. Further, the cab 4 is attached to one end portion in the width direction of the front end frame 4 via the 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. A wire rope (not shown) is wound around the lower spreader and a sheave (pulley) provided at the tip of the mast, and the wire rope is wound and unwound by the winch 12 so that the mast is formed. Ups and downs. The boom rises and falls due to ups and downs of the mast.

The counterweights 3 for balancing the suspended load are arranged on both sides of the rear end of the main frame 3.

The engine 13 is arranged at a rear portion inside the upper frame 2. A hydraulic pump (not shown) is connected to the engine 13, and the hydraulic pump is rotated by the engine 13 to supply pressure oil to hydraulic equipment at various places such as the hydraulic drive device of the winch 12 and the hydraulic drive device 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 refers to 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) and the like is required on the lower side of the engine 13, the engine 13 is arranged slightly above to secure this space S. High-temperature exhaust gas from the engine 13 is exhausted 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 on the rear side of the heat exchanger 15, and a louver 19 is arranged inside an opening 16a at the rear end of the duct 16. The louver 19 changes the flow of the outside air so that the outside air taken in from the opening 16a by the rotation of the fan 14 is directed to the heat exchanger 15, and a plurality of plate-like bodies 19a arranged in parallel in the vertical direction. -19d. The plurality of plate-shaped bodies 19a to 19d arranged at a predetermined interval are arranged obliquely upward toward the front (on the side of the heat exchanger 15).

The duct 16 has, in order from the rear, a first duct portion 17 in which the louver 19 is arranged inside, 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 larger than the vertical dimension H1 of the first duct portion 17. 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 as guards for covering the openings of the respective parts are attached to the upper frame 2, and the engine 13, the fan 14, the heat exchanger 15, and the duct 16 are It is surrounded by guard plates 20 and 22.

The fan 14, the duct 16, and the louver 19 form an intake structure, and the intake structure 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 16a at the rear end of the duct 16. Most of the air that has flowed into the duct 16 changes its flow direction obliquely upward at the louver 19 portion, and goes to the heat exchanger 15. It should be noted that there is also a flow of air that flows toward the heat exchanger 15 without changing its direction so much like air that has flowed into the lower end of the opening 16a. The air hits the heat exchanger 15, and oil or water flowing inside the heat exchanger 15 is cooled.

The intake structure having the above configuration has the following actions and effects.
By arranging the duct 16 for taking in outside air (air) on the rear side of the heat exchanger 15, the outside air is smoothly guided to the heat exchanger 15. Further, by disposing the louver 19 that changes the flow of the outside air inside the duct 16, the louver 19 can apply air to the entire heat exchanger 15. In addition, the presence of the louver 19 reduces the opening area when the opening 16a of the duct 16 is viewed from directly behind (because the heat exchanger 15 cannot be seen completely), so that noise generated by the engine 13 or the like is opened. It is possible to suppress leakage from the portion 16a to the outside. Furthermore, since the outside air is taken in from directly behind the upper frame 2, it is difficult for the high-temperature exhaust gas from the engine 13 to be taken into the duct 16.

By disposing the louver 19 inside the duct 16 and at the rear portion thereof, an appropriate gap can be provided between the louver 19 and the heat exchanger 15, and air can be more easily applied to the entire heat exchanger 15. ..

By detachably attaching the duct 16 to the upper frame 2, it is possible to assemble the construction machine 1 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, the vibration of the engine 13 can be suppressed from being transmitted to the duct 16, and the damage to the duct 16 due to the vibration of the engine 13 can be suppressed.

In addition to the duct 16, the louver 19 is also removable. A sound absorbing material (not shown) is stretched on the inner surface of the duct 16 and the surfaces of the plate-like members 19a to 19d forming the louver 19. According to this configuration, the sound absorbing material is replaced by removing the louver 19. Easy to do. Further, a worker can enter the inside of the upper frame 2 through the opening 16a to perform maintenance (cleaning, etc.) of the heat exchanger 15, and the maintainability of the heat exchanger 15 is also improved.

The duct 16 has the first duct portion 17 and the second duct portion 18 whose upper end is higher than the first duct portion 17 in this order from the rear, so that the rear end frame 5 forming the upper frame 2 is avoided. It can be arranged.

Since the vertical center C1 of the first duct portion 17 is lower than the vertical center C2 of the engine 13, the hot exhaust gas from the engine 13 is more difficult to be taken in.

Since the louver 19 is composed of a plurality of plate-shaped 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 detachably attached to the guard plates 20 and 22.

Instead of the rear part inside the duct 16, the louver 19 may be arranged at the front part inside the duct 16, for example, inside the second duct part 18 forming the duct 16.

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

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

The sound absorbing material may not be stretched on the inner surface of the duct 16 or the surfaces of the plate-shaped members 19a to 19d forming the louver 19.

Although the embodiment of the present invention has been described above, it is needless to say that various modifications can be made within a range that can be assumed by 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 portion C2: Vertical center of the engine

Claims (7)

A box-shaped upper frame,
An engine disposed inside the upper frame,
A fan connected to the engine, the fan being arranged inside the upper frame and on the rear side of the engine,
A heat exchanger disposed inside the upper frame and behind the fan;
A duct for taking in outside air, which is arranged inside the upper frame and on the rear side of the heat exchanger,
A louver disposed inside the duct, wherein the louver changes the flow of the outside air so that the outside air taken in from the opening by the rotation of the fan is directed toward the heat exchanger,
A guard surrounding the engine, the fan, the heat exchanger, and the duct, the guard being attached to the upper frame,
A construction machine equipped with. The construction machine according to claim 1,
A construction machine, wherein the louver is arranged at a rear portion inside the duct. The construction machine according to claim 1 or 2,
Construction machine, wherein the duct is removably attached to the upper frame. The construction machine according to any one of claims 1 to 3,
A construction machine, wherein the louver is removably attached to the duct or the upper frame. The construction machine according to any one of claims 1 to 4,
The said duct is a construction machine which has a 1st duct part in which the said louver is arrange|positioned inside, and a 2nd duct part whose upper end is higher than the said 1st duct part in order from the back. The construction machine according to claim 5,
Exhaust gas from the engine is discharged upward from the upper frame,
A construction machine in which the vertical center of the first duct portion is lower than the vertical center of the engine. The construction machine according to any one of claims 1 to 6,
A construction machine in which the louver is composed of a plurality of plate-shaped bodies arranged in parallel in the vertical direction.

Images