JPH1181373A - Engine intake system for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify an air pipeline by connecting an intake pipeline to an air chamber formed to a radiator support frame for an engine. SOLUTION: The channel-shaped sectional opening section of a radiator frame 34 is installed integrally or to a main frame 10a by welding, both ends in the longitudinal direction of the radiator support frame 34 are closed by plates 34a, 34b, and an air chamber 35 in a closed space is formed into the radiator support frame 34. The intake system 22 introducing the outside air induced from an air cleaner 18 into an intake manifold opening 8d for an engine 8 through an intake pipeline 20, the air chamber 35 and a suction pipeline 21 is formed. Since the intake pipelines 20, 21 are piped through the air chamber 35 integrally formed to the radiator support frame 34 of an engine chamber 10, air may not be passed through an engine partition wall 11, and the intake pipelines can be simplified. Since the air chamber 35 is mounted into the radiator support frame 34, an existing space in the engine chamber 10 can be utilized effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine air intake device for a construction machine, and more particularly to an engine air intake device capable of compactly disposing an engine air intake pipe or the like requiring a relatively large space in an engine room.

[0002]

2. Description of the Related Art A construction machine, for example, a hydraulic shovel, which is a typical construction machine, includes a lower traveling body and an upper revolving body that is swingably mounted on the lower traveling body. An engine room accommodating an engine as a power source is formed. In the engine room, an intake device having an intake pipe for supplying intake air from an air cleaner to the engine is provided. The engine room is also provided with a cooling device such as a radiator for cooling engine cooling water and an oil cooler for cooling hydraulic oil. The engine compartment is further provided with an engine exhaust muffler.

[0003] The exhaust sound of an engine in a construction machine is a large noise source requiring noise prevention measures. Therefore, the engine room is provided with a large and large-capacity engine exhaust muffler. On the other hand, in construction work in an urban area or a residential area, further reduction in noise of construction machinery is required, and as one of the measures, measures are taken to reduce air noise flowing through the intake system of the engine. In order to reduce the noise of the engine intake system, an intake muffler is provided in the engine intake line. As a well-known intake muffler, a resonance type muffler that uses a resonance phenomenon of a specific frequency by providing a resonance space in an intake pipe, and uses a reflection phenomenon of a sound wave by enlarging an intake pipe and enlarging or reducing a cross section of the pipe. An inflatable muffler or the like is used.

[0004]

The conventional engine intake device for a construction machine of the type described above has the following problems to be solved. That is, (1) Since devices such as an exhaust muffler, a radiator, and an oil cooler provided in an engine room of a construction machine are relatively large, a space for providing an intake muffler is narrowly limited. In order to provide the intake muffler, it is necessary to change the size of the engine room, the arrangement of devices in the engine room, and the like. (2) The intake pipe, that is, the intake air pipe has a relatively large diameter, and the pipe is connected to the engine main body through an engine partition surrounding the engine, so that the structure of the intake pipe becomes complicated. Moreover, since the intake conduit has little flexibility, it is difficult to assemble the intake conduit. (3) The air cleaner connected to the intake pipe is an important thing that requires maintenance such as cleaning and replacement of the air cleaner element. The engine room has a radiator, an oil cooler, and water connected thereto. Since the piping, the oil piping, the engine exhaust muffler, and the like are provided, the mounting position of the air cleaner is limited, and the maintenance of the air cleaner is difficult.

The present invention has been made in view of the above-mentioned facts, and the technical problems thereof are (1) the intake pipe can be simplified, and (2) the intake muffler has a large engine room, Can be provided without changing the arrangement of the
(3) An object of the present invention is to provide an engine intake device for a construction machine in which an air cleaner can be freely arranged.

[0006]

According to the present invention, in order to solve the above technical problems, an engine of a construction machine having an intake pipe for supplying intake air from an air cleaner to an engine housed in an engine room. In the intake device, an engine intake device for a construction machine is provided, wherein the intake pipe is connected to an air chamber formed in a radiator support frame of the engine.

[0007] In a preferred embodiment, the air chamber forms an intake muffler. The air chamber has an intake inlet hole and an intake outlet hole, and the air cleaner is connected to the intake inlet hole.

Therefore, in the engine intake device for a construction machine according to the present invention, the intake pipe is connected to an air chamber formed in a radiator support frame of the engine.
Since the air muffler is formed by the air chamber formed in the radiator support frame, the air pipe is simplified, and the air is sucked into the intake pipe without changing the size of the engine room and the arrangement of the equipment. A muffler is provided. further,
Since the air cleaner is connected to the air chamber without piping directly to the engine body, the air cleaner can be freely arranged at any position.

The radiator support frame in the present invention means a frame for supporting a cooling device such as a radiator or an oil cooler in an engine room, and does not necessarily support only the radiator, but also a floor of the engine room. Not only those that connect between the surface and the cooling device, but also those that connect with the side surface, the upper surface, or other appropriate members of the engine compartment.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a construction machine according to a first embodiment of the present invention;

Referring to FIG. 1, a hydraulic shovel, which is a typical construction machine generally designated by reference numeral 2, will be described. The hydraulic shovel 2 includes a lower traveling body 4 and An upper revolving body 6 is provided, and an engine room 10 in which an engine 8 as a power source is accommodated is formed in the upper revolving body 6. In front of the engine compartment 10 (to the left in FIG. 1), the work implement 12 and the cab 14
However, a counterweight 16 is mounted behind the engine room 10 (to the right in FIG. 1).

Referring to FIG. 2 and FIG. 3, an outline of an engine intake device, which is indicated by the reference numeral 22 and the arrangement of devices around the engine 8 in the engine room 10, will first be described. An intake device 22 having intake pipes 20 and 21 for supplying intake air from an air cleaner 18 provided in the chamber 10 to the engine 8 is provided. The engine room 10 is also provided with a cooling device 28 having a radiator 24 for cooling the cooling water of the engine 8 and an oil cooler 26 for cooling the hydraulic oil. The radiator 24 and the oil cooler 26 are cooled by cooling air generated by a cooling fan 8 a that is driven to rotate by the engine 8. The engine room 10 is further provided with an engine exhaust muffler 30 and a hydraulic pump 32 driven by the engine 8 to discharge hydraulic oil. (Note that illustration of a water pipe of the radiator 24 and an oil pipe of the oil cooler 26 is omitted.)

Referring to FIGS. 2 and 3, the structure of the engine compartment 10 will be described.
Main frame 10a forming a lower surface (lower side in FIG. 2) which is a floor surface of the vehicle, and a left side surface (left side in FIGS. 2 and 3)
Door 10b forming the right side (the right side in FIGS. 2 and 3) forming the right side (FIG. 2 and FIG. 3).
And an engine hood 10d forming an upper surface (upper side in FIG. 2). The rear surface (the lower side in FIG. 3) of the engine compartment 10 is defined by a counterweight 16. The front surface (upper side in FIG. 2) of the engine compartment 10 is defined by the driver's cab 14 and the like (not shown). An engine partition 11 is provided around the engine 8 in the engine room 10. The engine bulkhead 11 reduces the emission of engine noise to the outside and prevents ignition in the event that hydraulic oil leaks from the hydraulic pump 32 or the like. The engine bulkhead 11 is provided in the engine room 10.
When viewed from above (the state of FIG. 3). One side of the rectangle is defined by the counter weight 16. A partition wall 11a is provided on the opposite side of the counterweight 16.
However, a partition 11b is formed on the side of the cooling fan 8a of the engine 8, and a partition 11c is formed on the opposite side of the partition 11b. The partition 11b includes a radiator 24 and an oil cooler 26.
And a hydraulic pump 32 is provided on the partition wall 11c.
Is attached. Main frame 1 of engine room 10
A radiator support frame 34 that supports the radiator 24 and the oil cooler 26 is formed at 0a. The engine 8 is mounted on engine support frames 8b and 8c which are erected on the main frame 10a.

Referring to FIG. 4 together with FIGS. 2 and 3, the radiator support frame 34 and the air chamber 35 formed in the radiator support frame 34 will be described. The radiator support frame 34 has a channel-shaped cross section and is mounted on the main frame 10a of the engine compartment 10 on the engine partition 11b.
Are formed to be long in the extending direction, and an opening having a channel-shaped cross section is integrally attached to the main frame 10a by welding. Both ends in the longitudinal direction of the radiator support frame 34 are closed by plates 34a and 34b, respectively, and a closed space air chamber 35 is formed inside the radiator support frame 34. Radiator support frame 34
The cylindrical tube 34c is attached to the radiator support frame 34 so that both ends protrude from the two parallel sides of the radiator support frame 34 in parallel with the main frame 10a so as to penetrate two parallel sides of the channel-shaped cross-section. The cylindrical pipe 34c forms an intake outlet 35b on the engine 8 side and an intake inlet 35a on the other side. A plurality of small holes 34 opening to the surrounding air chamber 35 are provided at the center in the longitudinal direction of the cylindrical tube 34 c located in the air chamber 35.
d is formed. Thus, the small hole 34d and the air chamber 3
5, a resonance type intake muffler 40 is formed.

Referring to FIGS. 2 to 4, the air cleaner 18 opens and closes the door 10 of the engine compartment 10.
b and the door 10 between the oil cooler 26 of the cooling device 28
It is attached to a position where maintenance can be easily performed by opening b (the attachment means is not shown). The air cleaner 18 is connected to an intake port 35 a of the air chamber 35 by an intake pipe 20. The intake outlet hole 35 b of the air chamber 35 is connected to the intake manifold opening 8 d of the engine 8 by the intake pipe 21. Thus, the intake device 22 that guides the outside air to the intake manifold opening 8d of the engine 8, that is, the air cleaner 18, which is the inlet of the outside air, the intake pipe 20, the air chamber 35 formed integrally with the engine chamber 10, and the intake pipe 21 Are formed.

The operation of the engine intake device 22 of the construction machine as described above with reference to FIGS. 2 to 4 will be described. (1) The intake line 20 and the intake line 21
Since the piping is provided via the air chamber 35 formed integrally with the radiator support frame 34 of the zero, it is not necessary to pass through the engine partition wall 11, so that the intake pipe is simplified. (2) Since the air chamber 35 is provided in the radiator support frame 34 in the engine room 10,
Existing space within is effectively used. (3) Since the intake muffler 40 is formed by the air chamber 35, it is not necessary to change the size of the engine room 10, the arrangement of devices and the like in order to provide the intake muffler. (4) The intake muffler 40 resonantly absorbs and reduces the incident sound having a frequency that matches the natural frequency of the resonator by the resonator formed by the small hole 34d of the cylindrical tube 34c and the air chamber 35 behind it. (5) The air cleaner 18 can be connected to the intake inlet hole 35a of the air chamber 35 outside the engine partition 11 by the intake pipe 20.
Can be freely provided at a position where maintenance is easy.

Next, with reference to FIGS. 5 to 7, another embodiment of the intake muffler 50, 60, and 70 which can be formed on the radiator support frame 34 will be described. In FIGS. 5 to 7, substantially the same parts as those in FIG. 4 are denoted by the same reference numerals.

The intake muffler 50 will be described with reference to FIG. 5. The intake muffler 50 shows another embodiment of the resonance type muffler. The intake muffler 50 is provided with a partition plate 5 in which the air chamber 35 is parallel to two parallel sides of the radiator support frame 34.
0a, two communicating air chambers 50b and 5
0c. Air chamber 50b and air chamber 50c
Is a plate 34b at one end of the radiator support frame 34
The partition plate 50a is opened and communicates with the side.
The air chamber 50b is provided on the intake outlet hole 35b side, and the air chamber 50c is provided on the intake inlet hole 35a side. A plurality of small holes 50e are provided in one of the air chambers 50e in a cylindrical tube 50d provided substantially the same as the cylindrical tube 34c of the intake muffler 40 described above.
b. Thus, in the intake muffler 50, the resonance frequency is set by changing the shape of the air chamber 35 in the resonance space from that of the intake muffler 40.

The intake muffler 60 will be described with reference to FIG. 6. The intake muffler 60 shows still another form of the resonance type muffler. The intake muffler 60 is divided into two air chambers 60b and 60c by which the air chamber 35 communicates with the intake muffler 50 by a partition plate 60a, and the partition plate 60a is opened and communicated on the plate 34b side. . The air chamber 60b is provided on the intake outlet hole 35b side, and the air chamber 60c is provided on the intake inlet hole 35a side. Cylindrical pipes 60d, 60d are provided to form an intake inlet hole 35a and an intake outlet hole 35b, and the air chamber 60b and the air chamber 6 are provided.
The resonance frequency is set according to the length of the space through which the air flows 0c.

Referring to FIG. 7, the intake muffler 70 will be described. The intake muffler 70 forms an inflatable muffler. The intake muffler 70 includes cylindrical pipes 70c, 70c having an inner diameter d.
An intake inlet hole 35a and an intake outlet hole 35b are formed and provided, respectively. In the air chamber 35, an air chamber 70b formed by a cylindrical member 70a having an inner diameter D larger than the inner diameter d is formed. The noise frequency is attenuated by utilizing the sound wave reflection phenomenon caused by the expansion (inner diameter D) and reduction (inner diameter d) of the inner diameter of the intake pipe.

As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and can be variously modified or modified within the scope of the present invention. It is. For example, (1) The air chamber 35 in the embodiment of the present invention is formed on the radiator support frame 34 that is integrally welded to the main frame 10a between the main frame 10a of the engine room 10 and the cooling device 28. However, the radiator support frame 34 in which the air chamber 35 is formed is manufactured independently,
It may be attached to the main frame 10a by fastening means such as bolts and nuts. (2) Further, like a radiator support frame generally indicated by reference numeral 80 shown in FIGS. 8 to 10, it is formed so as to surround the radiator 24 and the oil cooler 26 of the cooling device 28 in addition to the radiator support frame 34. When the radiator support frame 80 is provided, the radiator support frame 80 can be provided with an air chamber 82, an intake inlet hole 82a, an intake outlet hole 82b, and the like. The air chamber 82
The air chamber 35 and the air chamber 35 can be used in appropriate communication.
8 to 10, the same parts as those in FIGS. 2 and 3, and substantially the same parts, are denoted by the same reference numerals and description thereof will be omitted. (3) In the air chamber 35 according to the embodiment of the present invention, an intake inlet hole 35a and an intake outlet hole 35b are formed, but the intake inlet hole 35a and the intake outlet hole 35b may be integrated into one. , An intake muffler can be formed in the air chamber 35.

[0022]

According to the engine intake device for a construction machine constructed according to the present invention, (1) the intake pipe can be simplified, and (2) the size of the engine
(3) An engine intake device for a construction machine, which can be provided without changing the arrangement of devices and the like, and (3) the air cleaner can be freely arranged.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel, which is a typical construction machine including an engine intake device for a construction machine configured according to the present invention.

FIG. 2 is a sectional view of FIG. 1 as viewed in the direction of arrows AA.

FIG. 3 is a sectional view of FIG. 2 as viewed in the direction of arrows BB.

FIG. 4 is a cross-sectional view showing one mode of the intake muffler, when FIG. 2 is viewed in the direction of arrows CC.

FIG. 5 is a cross-sectional view showing another embodiment of the intake muffler when FIG. 2 is viewed in the direction of arrows CC.

FIG. 6 is a cross-sectional view showing still another embodiment of the intake muffler when FIG. 2 is viewed in the direction of arrows CC.

FIG. 7 is a cross-sectional view showing still another embodiment of the intake muffler, when FIG. 2 is viewed in the direction of arrows CC.

FIG. 8 is a cross-sectional view of another embodiment of an engine intake device for a construction machine configured according to the present invention, as viewed in the direction of arrows AA in FIG.

FIG. 9 is a cross-sectional view of FIG. 8 as seen in the direction of arrows DD.

FIG. 10 is a sectional view of FIG. 9 as seen in the direction of arrows EE.

[Explanation of symbols]

 2: Hydraulic excavator (construction machine) 8: Engine 10: Engine room 18: Air cleaner 20, 21: Intake pipeline 22: Engine intake device 34, 80: Radiator support frame 35, 82: Air chamber 35a, 82a: Intake inlet hole 35b, 82b: intake outlet holes 40, 50, 60, 70: intake muffler

Claims (3)

[Claims] 1. An engine intake device for a construction machine having an intake line for supplying intake air from an air cleaner to an engine housed in an engine room, wherein the intake line is formed in a radiator support frame of the engine. An engine air intake device for a construction machine, wherein the engine air intake device is connected to an air chamber. 2. The engine intake device for a construction machine according to claim 1, wherein an intake muffler is formed by the air chamber. 3. The engine intake device for a construction machine according to claim 1, wherein the air chamber has an intake inlet hole and an intake outlet hole, and the air cleaner is connected to the intake inlet hole.