JP2005238891A - Turning work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve sound insulation and heat insulation by forming a fixed cover covering an engine with a three layer structure consisting of an outer wall, an inner wall, and an air layer between the walls. <P>SOLUTION: A driver's seat 16, the engine 21 mounted in the rear of this driver's seat 16, and a radiator 22 and a radiator fan 23 set on one side of the engine 21 in the horizontal direction are provided on a turntable 4. An engine room 24 with the engine 21, the radiator 22 and the radiator fan 23 disposed therein is covered with a cover device 25 supported through a support frame 31. The cover device 25 is provided with the fixed cover 33 covering the engine 21 between the engine 21 and the driver's seat 16, and an opening/closing hood 34 set in the rear side of the fixed cover 33. The fixed cover 33 is provided with the outer wall 43 on the driver's seat side and the inner wall 44 on the engine 21 side, and furthermore, an air layer part 45 between the outer wall 43 and the inner wall 44. An inlet 51 capable of introducing air in the air layer part 45 and an outlet 52 capable of discharging air from the air layer part 45 are provided in the inner wall 44. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a turning work machine such as a backhoe.

Conventionally, this type of swivel work machine is equipped with a driver's seat on the swivel and an engine behind the driver's seat, and the engine is covered with a cover device to form an engine room. There is a fixed cover that covers the engine. This fixed cover uses a single plate-like one, and its central part is formed so as to be immersed in the engine room side, and an opening window is formed in this central part.
JP 2003-74085 A

In a conventional turning work machine, in order to prevent heat and noise from the engine in the engine room from being transmitted to the driver's seat, it is possible to attach a sound absorbing material or a heat insulating material to the fixed cover. However, since the central portion of the fixed cover is formed in a rear immersive manner and an opening window is formed, it is difficult to attach a sound absorbing material or the like, and it is difficult to ensure sound insulation and heat insulation.
SUMMARY OF THE INVENTION Accordingly, the present invention has an object to provide a turning work machine having improved sound insulation and heat insulation by providing a fixed cover that covers an engine with a three-layer structure including an outer wall, an inner wall, and an air layer between both walls. .

The present invention has taken the following technical means in order to solve the above problems.
That is, first, it has a driver's seat 16 on the turntable 4, an engine 21 mounted behind the driver's seat 16, a radiator 22 and a radiator fan 23 provided on one side of the engine 21 in the left-right direction, The engine 21, the radiator 22, and the radiator fan 23 are covered with a cover device 25 supported via a support frame 31, and the cover device 25 covers the engine 21 between the engine 21 and the driver's seat 16. And an open / close bonnet 34 provided on the rear side of the fixed cover 33. The fixed cover 33 includes an outer wall 43 on the driver's seat 16 side and an inner wall 44 on the engine 21 side, and the outer wall 43 and the inner wall. 44 is provided with an air layer portion 45, and air is introduced into the inner wall 44 from the inside of the air layer portion 45 and the inlet 51 through which air can be introduced into the air layer portion 45. Is that are provided with an exhaust port 52 which can be discharged to the outside.

Accordingly, the outer wall 43, the inner wall 44, and the air layer portion 44 of the fixed cover 33 form a three-layer heat insulating / sound insulating layer, thereby improving the sound insulating property and heat insulating property, as well as the introduction port 51 and the exhaust port 52. By causing the air in the air layer portion 45 to flow through, the temperature rise in the air layer portion 45 can be suppressed, and the heat insulation performance can be further improved.
Second, the upper portion of the fixed cover 33 is attached to the support frame 31, and the attachment portion 54 of the fixed cover 33 is formed by closely contacting the outer wall 43 and the inner wall 44.
According to this, the strength of the mounting portion 54 formed by closely contacting the outer wall 43 and the inner wall 44 is increased, and the fixing cover 33 can be reliably fixed to the support frame 31.

Third, the fixed cover 33 is formed with an opening 46 for communicating the engine room 24 and the outside, and the edge 47 of the opening 46 is formed by closely contacting the outer wall 43 and the inner wall 44. is there.
According to this, by forming the edge 47 of the opening 46 in close contact with the outer wall 43 and the inner wall 44, the opening 46 can be strengthened, and the opening 46 is provided in the fixed cover 33. Even if it exists, sufficient intensity | strength can be ensured.
Fourthly, the fixed cover 33 is integrally formed by blow molding, or is formed by joining two plates in the middle.

  According to this, if the fixed cover 33 is formed by blow molding, it can be adapted to small quantity and mass production, and the outer wall 43, the inner wall 44 and the air layer part 45 can be formed at a time. In addition, if the fixed cover 33 is formed by joining two plates in the middle, it can be adapted to low-volume production of various products using sheet metal.

  By making the fixed cover that covers the engine a three-layer structure including an outer wall, an inner wall, and an air layer between both walls, the sound insulation and heat insulation can be improved.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 7, the swivel working machine 1 has a swivel base 4 mounted on the upper part of a traveling device 3 having a pair of left and right crawler traveling bodies 2 so as to be rotatable around a swivel axis X in the vertical direction via a swivel bearing. A working device 5 is provided at the front end of the swivel 4.
The work device 5 includes a swing bracket 6 attached to the front end of the swivel base 4 so as to be able to swing left and right, a boom 7 connected to the swing bracket 6 so as to be swingable up and down, and swinging up and down at the tip of the boom 7. The excavation work device includes an arm 8 that is movably coupled and a bucket 9 that is pivotably coupled to the tip of the arm 8. The swing bracket 6, the boom 7, the arm 8, and the bucket 9. Are operated by hydraulic cylinders 10, 11 and 12, respectively.

1, 2, and 7, a base frame 13 is provided at the bottom of the swivel base 4, and a counterweight 14 is provided at the rear end of the base frame 13. Is covered with a cover body 30. Side protectors 15 that protect the left and right corners of the rear end of the swivel base 4 are disposed on both the left and right sides of the counterweight 14.
In FIG. 2, a driver's seat 16 is disposed on the swivel 4 at the rear of the work device 5, and a controller 19 having a control lever 17, a control pedal 18, and the like is provided in front of the driver's seat 16. The control unit 19 and the driver's seat 16 are covered with a cabin 20.

Various devices such as an engine 21, a radiator 22, and a radiator fan 23 are mounted behind the driver seat 16, and these devices are accommodated in a cover device 25 that covers the engine room 24.
The engine 21 is horizontally placed at the rear center of the swivel 4 at a substantially horizontal center, and a radiator 22 and a radiator fan 23 are arranged on one side of the engine 21 in the left-right direction (right side in the illustrated example).
In FIG. 1, a partition member (fan shroud) 26 is provided on the outer periphery of the radiator fan 23, and the right side of the engine room 24 is partitioned by the partition member 26.

The partition member 26 includes a partition wall 27, a first annular portion 28 projecting from the partition wall 27 toward the radiator 22, and a second annular portion 29 projecting from the partition wall 27 toward the engine 21. A substantially central portion of the partition wall 27 is provided with a left-right penetrating opening that communicates the first annular portion 28 and the second annular portion 29.
The radiator fan 23 is accommodated in the second annular portion 29, and the radiator 22 is disposed on the outer side (right side) of the first annular portion 28. Cooling of the radiator 19 by the radiator fan 23 employs a suction type, which is rotationally driven by the power of the engine 21 and sucks air outside the cover device 25 (hereinafter referred to as outside air) into cooling air, This cooling air is applied to the radiator 22 for cooling. The air that has cooled the radiator 22 is caused to flow toward the engine room 24 by the radiator fan 23.

The cover device 25 is supported by a support frame 31 provided on the swivel base 4, a side cover 32 provided on the left and right sides (right side in the illustrated example) of the swivel base 4, and the left and right other sides (see FIG. In the example, a fixed cover 33 provided on the left side) and an open / close bonnet 34 are provided.
The support frame 31 has an attachment plate 36 for attaching the cover device 25 to the upper portion, and the attachment plate 36 is supported by a plurality of (three in the illustrated example) support legs 37.
The mounting plate 36 has a rectangular shape and is disposed above the engine 21 along the left-right direction. The support legs 37 are provided on the left and right ends of the mounting plate 36 and in the middle in the longitudinal direction of the mounting plate 36 (in the illustrated example, the substantially central portion in the longitudinal direction), and the lower portions of the support legs 37 are fixed to the swivel base 4. ing.

  The side cover 32 is provided on the right side of the cabin 20 over substantially the entire width of the swivel base 4 in the front-rear direction. The side cover 32 covers a hydraulic oil tank 38, a fuel tank 39, and the like disposed on the left and right sides (right side in the illustrated example) of the swivel base 4. The radiator 22 is housed behind the hydraulic oil tank 38 or the like and at the rear of the side cover 32. In the upper part of the side cover 32, an opening 32 a is formed extending from the front part to above the hydraulic oil tank 38, the fuel tank 39, and above the water inlet of the radiator 22. The opening 32a is closed by a lid 41 that can be freely opened and closed, and the lid 41 can be opened to perform maintenance operations such as oiling, water supply, and inspection.

A suction port 42 for sucking outside air into the cover device 25 is provided at the rear part of the outer wall (right side wall) of the side cover 32. The suction port 42 is provided on the right side of the radiator 22. In addition, the suction port 42 is configured by forming an inner and outer opening in the outer wall of the side cover 32 and providing a mesh cover member so as to cover the opening. The radiator fan 23 sucks outside air into the cover device 25 (engine room 24) through the suction port 42.
The fixed cover 33 is disposed between the driver's seat 16 and the engine 21 and covers the engine 21. The fixed cover 33 is formed in a substantially L shape in a side view, and a front portion thereof is erected up and down so as to separate the driver's seat 16 and the engine 21. It covers the upper side. The upper part of the fixed cover 33 is supported by a support frame 31 provided on the swivel base 4. Further, the rear portion of the cabin 20 is placed on the upper portion of the fixed cover 33. An attachment portion 33 b for attaching to the swivel base 4 is provided below the fixed cover 33, and the fixed cover 33 is fixed to the turntable 4 by fixing the attachment portion 33 b to an attachment stay provided on the swivel base 4. It is attached.

  The fixed cover 33 has a double structure including an outer wall 43 on the driver's seat 16 side (outside) and an inner wall 44 on the engine 21 side (inside). The outer wall 43 and the inner wall 44 are spaced apart in the front-rear direction, and an air layer portion 45 is formed between the outer wall 43 and the inner wall 44. As described above, the fixed cover 33 has a double structure of the outer wall 43 and the inner wall 44, and the air layer portion 45 is formed between the outer wall 43 and the inner wall 44. 44 and the three heat insulation / sound insulation layers composed of the air layer portion 45, thereby making it difficult for heat and noise of the engine 21 to be transmitted to the driver's seat 16 side.

In FIGS. 1, 3, and 5, an opening 46 that connects the engine room 24 and the outside is formed on the front side of the fixed cover 33. The opening 46 is an inspection port for inspecting equipment in the engine room 24. In the illustrated example, the number of the openings 46 is two, and the openings 46 are provided adjacent to each other in the left-right direction.
The edge 47 of the opening 46 is formed by closely contacting the outer wall 43 and the inner wall 44, thereby reinforcing the portion around the opening 46. Note that the number of openings 46 may be three or more.

A side wall 48 that covers the left side of the engine 21 is provided vertically along one end of the fixed cover 33 in the left-right direction (left side in the illustrated example). The side wall 48 is configured separately from the fixed cover 33, and is detachably provided on the fixed cover 33 via an attachment portion 33 a provided at the left end of the fixed cover 33. The mounting portion 33a is formed by closely contacting the outer wall 43 and the inner wall 44. In the illustrated example, the side wall 48 is fixed to the mounting portion 33a by bolting.
A connecting portion 49 for connecting to the side cover 32 is provided at the other end in the left-right direction of the fixed cover 33 (right side in the illustrated example). The side cover 32 and the fixed cover 33 are connected to each other by bolting or the like via a connecting portion 49. By connecting the side cover 32 and the fixed cover 33 in this way, the rear side of the side cover 32 and the right side of the fixed cover 33 are continuously integrated to form a storage space for a device such as the radiator 22. ing.

The fixed cover 33 is made of resin and formed into an internal cavity by blow molding. The fixed cover 33 may be formed by joining two metal plates in the middle (middle) shape without using blow molding. If the fixed cover 33 is formed by blow molding, the heat insulation / sound insulation layer of the outer wall 43, the inner wall 44, and the air layer portion 45 can be formed at a time, and the manufacturing process can be shortened to reduce the number of products. It is suitable for mass production.
Further, if the fixed cover 33 is formed by joining the outer wall 43 and the inner wall 44 separately so that the air layer portion 45 can be formed, various materials can be used for the outer wall 43 and the inner wall 44. Thus, it becomes possible to form the fixed cover 33 that is suitable for small-lot production of various products.

The inner wall 44 of the fixed cover 33 is provided with an introduction port 51 through which air can be introduced into the air layer portion 45 and an exhaust port 52 through which air can be discharged from the air layer portion 45. The introduction port 51 and the exhaust port 52 are provided in the upper part of the inner wall 44, are formed in an opening shape in a vertically penetrating manner, and communicate the engine room 24 and the air layer portion 45.
The inlet 51 is formed near one end in the left-right direction of the fixed cover 33 (closer to the right end in the example), while the exhaust port 52 is closer to the other end in the left-right direction of the fixed cover 33 (left end in the example shown). It is formed on the part).

The introduction port 51 is provided at an intermediate position between the engine 21 and the partition member 27 in the left and right sides (right side in the illustrated example) of the inner wall 44 in the vicinity of the radiator 22, more specifically in the left and right direction. On the other hand, the exhaust port 52 is provided on the left and right other sides (left side in the illustrated example) of the inner wall 44. Accordingly, the introduction port 51 and the exhaust port 52 are formed on the inner wall 44 so as to be separated from each other in the left-right direction, and the air introduced from the introduction port 51 enters the engine room 24 from the exhaust port 52 that is separated in the left-right direction of the exhaust port 52. It will be exhausted.
The introduction port 51 is provided with guide means for changing the flow of air sent by the radiator fan 23 and guiding it to the introduction port 51. The guide means includes a plate member 53 provided obliquely downward from the edge of the introduction port 51 near the engine 21 toward the radiator fan 23.

The plate member 53 is fixed to the inner surface (surface on the engine room 24 side) side of the inner wall 44 by bolting or the like. The air sent from the radiator fan 23 toward the engine 21 strikes the plate member 53 so that the flow changes toward the introduction port 51.
Further, when the plate member 53 is provided in the reverse direction, that is, obliquely downward toward the engine 21 from the edge of the inlet 51 near the radiator fan 23, the air in the air layer portion 45 is sent from the radiator fan 23 to the engine 21. The air can be exhausted from the introduction port 51 by being attracted by the wind power that sends air toward the vehicle, and the introduction port 51 and the exhaust port 52 can be reversed as in this case.

As described above, the introduction port 51 is provided near one end portion in the left-right direction of the fixed cover 33 and the exhaust port 52 is provided near the other end portion so as to be separated. It becomes possible to distribute (flow). Therefore, air always flows in the air layer portion 45, and a temperature rise in the air layer portion 45 can be prevented and heat insulation can be improved.
An attachment portion 54 for attaching to the support frame 31 is provided on the upper portion of the fixed cover 33, and the fixed cover 33 is fixed to the support frame 31 via the attachment portion 54. The attachment portion 54 is formed by closely contacting the outer wall 43 and the inner wall 44, and an attachment hole 55 is formed in a vertically penetrating manner at the central portion of the contact portion. The mounting plate 36 of the support frame 31 is provided with holes corresponding to the mounting holes 55, and the fixing cover 33 is fixed to the mounting plate 36 by bolting or the like through these holes. The rear portion of the cabin 20 is fixed to the support frame 31 together with the fixed cover 33 via the mounting portion 54.

The opening / closing bonnet 34 is provided on the rear side of the fixed cover 33 and is supported by the support frame 31 so as to be freely opened and closed. The front upper part of the open / close bonnet 34 is attached to the attachment plate 36 via the attachment member 57, whereby the open / close bonnet 34 is pivotally supported by the upper part of the support frame 31. As a result, the open / close bonnet 34 can be opened and closed vertically, and the rear side of the engine room 24 can be inspected.
The present invention is not limited to the above embodiment, and various modifications are possible as follows.
For example, the cooling of the radiator 22 may be a discharge type, and air on the engine room 24 side may be applied to the radiator 22 by the radiator fan 23. In this case, the air in the air layer portion 45 is attracted by the wind power of the radiator fan 23 and exhausted from the introduction port 51. The introduction port 51 serves as an exhaust port, and conversely, the exhaust port 52 serves as an engine. It becomes an inlet for introducing the air in the room 24 into the air layer portion 45.

In addition, the introduction port 51 and the exhaust port 52 can be formed in the outer wall 43, and thereby, the outside air may be circulated through the air layer portion 45 to ensure sound insulation and heat insulation. .
Further, a lops may be provided on the swivel 4 in place of the cabin 20, and in this case, the rear portion of the lops may be fixed to the upper portion of the fixed cover 33.

It is a top view of a turntable. It is a principal part enlarged side view of a turning work machine. It is a top view of a fixed cover. It is a front view of a fixed cover. It is a left view of a fixed cover. It is a right view of a fixed cover. It is a left view of a turning work machine.

Explanation of symbols

4 Swivel Table 16 Driver's Seat 21 Engine 22 Radiator 23 Radiator Fan 24 Engine Room 25 Cover Device 31 Support Frame 33 Fixed Cover 43 Outer Wall 44 Inner Wall 45 Air Layer Portion 46 Opening Portion 47 Edge 51 Inlet Port 52 Exhaust Port 54 Mounting Portion

Claims (4)

A driver seat (16) on the swivel base (4), an engine (21) mounted on the rear side of the driver seat (16), a radiator (22) provided on one side of the engine (21) in the left-right direction, and a radiator fan (23), the engine (21), the radiator (22) and the radiator fan (23) are covered with a cover device (25) supported via a support frame (31),
The cover device (25) includes a fixed cover (33) that covers the engine (21) between the engine (21) and the driver's seat (16), and an open / close bonnet ( 34)
The fixed cover (33) includes an outer wall (43) on the driver's seat (16) side and an inner wall (44) on the engine (21) side, and an air layer portion (between the outer wall (43) and the inner wall (44)). 45) and an inlet (51) through which air can be introduced into the air layer portion (45) and an exhaust port through which air can be discharged from the air layer portion (45) to the inner wall (44). (52) and the turning work machine characterized by the above-mentioned.   The upper part of the fixed cover (33) is attached to the support frame (31), and the attaching part (54) of the fixed cover (33) is formed by closely contacting the outer wall (43) and the inner wall (44). The turning work machine according to claim 1, wherein:   An opening (46) for communicating the engine room (24) and the outside is formed in the fixed cover (33), and an edge (47) of the opening (46) is formed by an outer wall (43) and an inner wall (44). The swivel work machine according to claim 1, wherein the swivel work machines are formed in close contact with each other.   The swivel according to any one of claims 1 to 3, wherein the fixed cover (33) is integrally formed by blow molding, or is formed by joining two plates in the middle. Work machine.

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