JP2004156435A - Revolving work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an upper structure of a revolving work vehicle, which has a compact revolving body therefor. <P>SOLUTION: The upper structure of the revolving work vehicle includes a work machine having a boom rotatably attached to the revolving body 2, an arm rotationally attached to the boom, and a working attachment rotatably attached to the arm. The upper structure also includes an engine 34 and a hydraulic oil reserver tank 43 for hydraulic equipment, which are arranged under a hood 14 on the rear of the revolving body. According to the upper structure, a fuel tank 45 is formed in L-shape as viewed from the side, and a radiator 38 arranged on the rear of the reserver tank 43 forms L-shape as viewed from the side. Further the fuel tank 45 and part of a lower portion of the reserver tank 43 are arranged under a step 20. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a structure of an upper-part turning body such as a small turning type working vehicle having a reduced turning radius.

  2. Description of the Related Art Conventionally, in an excavation-type turning work vehicle, attempts have been made to make an upper turning body compact. For example, this is disclosed in Japanese Patent Application Laid-Open No. 11-303139. This is a small hydraulic excavator such as a small-slewing hydraulic excavator. The upper revolving structure is an intermediate strength member which is formed by orthogonally intersecting a pair of left and right front strength members erected in the upper revolving structure front-rear direction and a pair of vertical plates, and connected to a rear end of the vertical plates. And a front end of the horizontal plate, and a pair of left and right rear strength members erected in the front-rear direction, the intermediate strength member, and the rear strength member.

JP-A-11-303139

  Various equipment such as an engine and a hydraulic pump, a hydraulic oil tank for hydraulic equipment, a radiator, a fuel tank and a battery are arranged inside the revolving structure of the turning work vehicle, and these are used to reduce the influence of heat from the engine. Considering this, it was difficult to arrange the revolving unit compactly in order to reduce the size.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to claim 1, a boom rotatably attached to a revolving structure that is configured to be pivotable, an arm rotatably attached to the boom, and a work attachment rotatably attached to the arm. The fuel tank is formed in an L-shape when viewed from the side in an upper body structure of a turning work vehicle provided with a working machine having: In addition, the reservoir tank and a radiator disposed on the rear portion of the reservoir tank are formed in an L-shape in a side view, and a part of a lower portion of each of the fuel tank and the reservoir tank is disposed below a step.

  According to a second aspect of the present invention, the front surface of the rear portion of the fuel tank and the fuel supply port of the reservoir tank are shaped along the rising portion of the bonnet.

  According to a third aspect, the fuel tank and the reservoir tank are arranged on the left and right sides of the engine, and the engine is arranged horizontally.

  The present invention has the following effects.

According to the first aspect, by extending the front portion of the reservoir tank 43 below the step 20, the capacity of the reservoir tank 43 can be increased, and the space between the reservoir tank 43 and the control valve disposed in the front column 19 can be increased. Can be shortened.
Similarly, by extending the front portion of the fuel tank 45 below the step 20, the capacity of the fuel tank 45 can be increased and the fuel can be stored at a location remote from the engine 34.
Further, the internal structure of the revolving unit can be made compact, and the width of the revolving unit can be reduced.

  According to the second aspect, the internal structure of the rotating body can be made compact.

  According to the third aspect, the space inside the revolving superstructure can be effectively used. The engine can be placed in the center on the left and right.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is an overall side view of the turning vehicle, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, FIG. 4 is a rear view thereof, FIG. 5 is a side view showing a hood rotating structure, and FIG. FIG. 7 is a rear view, FIG. 8 is a left side view, FIG. 9 is a left side view of an engine showing a drive configuration of a fan, and FIG. FIGS. 11 and 12 are partial cross-sectional views of the right side showing the arrangement of the shielding plates, FIG. 12 is a plan view showing the configuration of the left rear part of the revolving structure, FIG. 13 is a partial cross-sectional view of the left side similarly, and FIG. FIG. 15 is a plan view of the rear part, and FIG.

The configuration of the turning work vehicle of the present invention will be described. This will be described with reference to FIGS.
The turning work vehicle supports a revolving body 2 at the upper center of the crawler-type traveling device 1 so as to be able to turn left and right, and a blade 3 is disposed at one of front and rear ends of the crawler-type traveling device 1 so as to be vertically rotatable. are doing.
A bonnet 14 for covering an engine or the like is disposed above the revolving superstructure 2, and a seat 16 is attached above the bonnet 14. In front of the seat 16, there is provided a driving operation unit 15 which is configured by arranging levers for performing driving operation and the like on a front column 19. A step 20 is arranged between the front column 19 and the bonnet 14 of the operation section 15.

A boom bracket 12 is attached to the front end of the revolving unit 2 so as to be rotatable left and right, and the lower end of the boom 6 is supported by the boom bracket 12 so as to be vertically rotatable.
The boom 6 is bent forward in the middle, and is formed in a substantially “C” shape having a bent portion 6d in a side view. An arm 5 is rotatably supported at an upper end of the boom 6, and a bucket 4 as a work attachment is rotatably supported at a tip of the arm 5. A working machine 7 is configured by the boom 6, the arm 5, the bucket 4, and the like.

The boom 6 is rotated by a boom cylinder 11, the arm 5 is rotated by an arm cylinder 10, and the bucket 4 is rotated by a bucket cylinder 9.
The boom cylinder 11, the arm cylinder 10, and the bucket cylinder 9 are configured as hydraulic cylinders. Each of the cylinders 9, 10, 11 supplies hydraulic oil from a hydraulic pump disposed in a bonnet 14 of the swivel 2 through a hydraulic hose. It is driven to expand and contract.
Further, the boom cylinder 11 is interposed between the cylinder support portion 12b of the boom bracket 12 and a boom cylinder bracket 36 provided on the front surface of the boom 6 at the middle, and the arm cylinder 10 is provided on the back surface of the boom 6 at the middle. The bucket cylinder 9 is interposed between the arm cylinder bottom bracket 31 and the bucket cylinder bracket 30 provided at the base end of the arm 5, and the bucket cylinder 9 is interposed between the bucket cylinder bracket 30 and the bucket bracket 29 connected to the bucket 4. Have been.

An opening 31 is provided below the revolving structure 2, and the cylinder rod of the swing cylinder 32 projects from the opening 31. The rear end of the swing cylinder 32 is rotatably supported by the frame 17 of the revolving unit 2. The tip of the cylinder rod of the swing cylinder 32 is connected to the boom bracket 12, and the boom bracket 12 is rotated left and right with respect to the revolving unit 2 by the swing cylinder 32.
The frame 17 is formed integrally with a counterweight at the rear part of the revolving superstructure 2. The frame 17 pivotally supports the boom bracket 12 at the front and forms a counterweight at the rear.
The boom bracket 12 is rotatably supported at the front of the frame 17. The central portion of the frame 17 constitutes a lower portion of the revolving structure 2 and connects a rear counterweight portion.

The revolving superstructure 2 is provided with a side opening 14b at a side portion, and a rear opening 52 and a lower opening 53 at a rear portion.
The side opening 14 b is provided on the left side of the hood 14. A radiator is provided inside the side opening 14b, and is cooled by air taken in from the side opening 14b.
The rear opening 52 is provided above the rear of the frame 17, and the lower opening 53 is provided at the lower rear of the frame 17. The air introduced through the side opening 14b is discharged from the revolving unit 2 through the rear opening 52 and the lower opening 53.

As shown in FIG. 5, the bonnet 14 provided on the revolving superstructure 2 is configured to be rotatable rearward.
The bonnet 14 is rotatably connected to the rear upper portion of the frame 17 at the lower rear portion. When the bonnet 14 is closed, the lower end of the bonnet 14 is locked by a locking tool or the like at a position where the lower end of the bonnet 14 abuts on the step 20, and is held in a closed state.
When the engine or the like is to be serviced, the locking tool and the like are released and the hood 14 is rotated rearward.

Next, a configuration inside the revolving superstructure 2 will be described with reference to FIGS.
A swivel joint 36 is connected to the center of the swing body 2, and a swing motor 37 is disposed near the swivel joint 36. The turning motor 37 is fixed to the frame 17.
On the frame 17, an engine 34, a hydraulic pump 35, a swing cylinder 32, and a reservoir tank 43 are provided. Further, an oil filter 44 for hydraulic oil is provided in front of the reservoir tank 43, and a radiator 38 is provided above the reservoir tank 43. Further, a fuel tank 45 is provided above the swing cylinder 32, and a battery 55 is provided behind the fuel tank 45.

  The engine 34 disposed inside the revolving superstructure 2 is disposed on the frame 17 via a rubber mount or a rubber laminated vibration isolator. A hydraulic pump 35 is connected to a side of the engine 34, and the hydraulic pump 35 is driven by the engine 34. The exhaust gas of the engine 34 is discharged outside the revolving unit 2 via a muffler 40 disposed behind the engine 34. The muffler 40 has an elliptical column shape, and is for introducing exhaust gas from above and discharging it downward.

In the revolving unit 2, the engine 34 has a crankshaft disposed in the left-right direction of the revolving unit 2, and a hydraulic pump 35 is connected to the crankshaft center of the engine 34.
The hydraulic pump 35 is connected to a swing cylinder 32, a swing motor 37, a swivel joint 36, a cylinder of the working machine 7, and the like via a hydraulic hose, a control valve in the front column 19, and the like.
The traveling device 1, the swing motor 37, the swing cylinder 32, the working machine 7, and the blade 3 are driven by a hydraulic oil discharged from a hydraulic pump 35 via a swivel joint 36.

A radiator 38 is provided on the side of the engine 34 opposite to the side to which the hydraulic pump 35 is connected, and a fan 39 is provided between the engine 34 and the radiator 38.
The fan 39 is fixed to a pulley 61 shown in FIG. 9, and the pulley 61 is connected to a pulley 63 that transmits a part of the driving force of the engine 34 via a belt 64. The pulley 61 is disposed above the engine 34. By driving the pulley 61, the fan 39 can be driven and cooling air can be introduced into the upper portion of the engine 34. A cylinder and an exhaust port are provided in the upper part of the engine 34, and the engine 34 can be effectively cooled by cooling air introduced by the fan 39.

  The radiator 38 is arranged on the side of the fan 39, and is arranged such that the position of the radiator 38 in a side view overlaps the position of the fan 39. That is, the radiator 38 is disposed immediately before the fan 39, and the distance from the radiator 38 to the engine 34 can be reduced.

Cooling water in the water jacket of the engine 34 is introduced into the radiator 38 via a hose or the like. Then, the cooling water introduced into the radiator 38 and cooled is returned into the water jacket of the engine 34 again.
The radiator 38 is disposed on the inside of the side surface of the revolving superstructure 2 so as to face outward. The fan 39 takes in outside air into the bonnet 14 to cool the radiator 38. The outside air introduced inside the bonnet 14 cools the radiator 38 and then cools the upper cylinder head of the engine 34.
The radiator 38 is provided on the side of the fan 39, and the radiator 38 is provided so as to overlap the fan 39 in a side view, and the radiator 38 is provided immediately before the fan 39. Thus, the distance from the radiator 38 to the engine 34 can be reduced.

A muffler 40 is provided at the rear of the engine 34, and the muffler 40 is connected to an exhaust port at the rear of the engine 34. The muffler 40 is disposed vertically in the revolving superstructure 2. Exhaust gas discharged from an exhaust port above the engine 34 is introduced from above the muffler 40 and discharged from below the muffler 40. The exhaust gas discharge portion of the muffler 40 coincides with the lower opening 53 provided at the lower rear portion of the frame 17, and the exhaust gas of the engine 34 passes through the lower opening 53 of the revolving unit 2 through the muffler 40. 2 is discharged outside.
An air cleaner 41 is disposed above the muffler 40, and an intake port 42 of the air cleaner 41 is disposed in the revolving unit 2 on a side opposite to a position where the radiator 38 is disposed. The air introduced into the air cleaner 41 through the intake port 42 is introduced into an intake port of the engine 34.

A reservoir tank 43 is disposed on the radiator 38 side of the revolving unit 2 in the front-rear direction of the revolving unit 2. The reservoir tank 43 stores the hydraulic oil of the hydraulic pump 35, and is connected to the hydraulic pump 35 by a hydraulic pipe.
The reservoir tank 43 is fixed on the frame 17, and a radiator 38 is provided on a rear upper surface of the reservoir tank 43. A step 20 is formed above the front part of the reservoir tank 43. An oil filter 44 is provided below the step 20 and in front of the reservoir tank 43.
The oil filter 44 is connected to the reservoir tank 43 and a control valve in the front column 19, and the hydraulic oil returning to the reservoir tank 43 via the control valve returns to the reservoir tank 43 via the oil filter 44. .
As described above, the vehicle has the boom rotatably attached to the revolving structure, the arm rotatably attached to the boom, and the work attachment rotatably attached to the arm. In the upper body structure of a turning work vehicle in which a working machine is provided and a reservoir tank of hydraulic oil for an engine and a hydraulic device is disposed in a hood at a rear portion of the turning body, a reservoir tank is provided in a front-rear direction at one end of an upper surface of a frame. Since it is arranged, the left and right width of the reservoir tank can be made short, and the space inside the revolving superstructure can be effectively used. In addition, the distance between the control valve disposed in the front column and the reservoir tank can be shortened, and the flow resistance of the hydraulic oil can be reduced. Further, it is possible to dispose the engine at the left and right central positions of the revolving superstructure. Further, since the reservoir tank also serves as a radiator mounting table, the radiator can be arranged in a space-saving manner, and the radiator can be arranged at an upper level of the engine with a simple configuration, thereby improving the cooling efficiency.

An oil supply port 43b extending upward is provided on the upper surface of the reservoir tank 43, so that hydraulic oil can be replenished from the oil supply port 43b.
The refueling port 43b of the reservoir tank 43 is disposed behind the step 20 and near the rising portion of the bonnet 14 in the revolving superstructure 2.
That is, the upper surface of the front part of the reservoir tank 43 has a shape along the lower surface of the step 20, and the fuel supply port 43 b is formed along the inner shape of the rising part formed in the front part of the bonnet 14.
The fuel supply port 43b of the reservoir tank 43 is located near the center of the bonnet 14 at the arrangement height. Thus, dust on the step 20 does not enter the oil supply port 43b. Further, when replenishing the working oil, the labor of the operator can be reduced.

In the revolving superstructure 2, the reservoir tank 43, the radiator 38, the fuel tank 45, and the battery 55 are accommodated in the front and rear length of the engine 34. Accordingly, the internal structure of the revolving unit 2 can be made compact, and the mass can be concentrated at the rear part of the revolving unit 2. Further, in the revolving superstructure, heavy objects can be arranged near the engine, and these heavy objects are arranged on the counterweight side. As a result, the heavy object can be concentrated on the rear portion of the revolving structure, and the weight balance of the revolving structure can be maintained well. The overall width of the revolving structure can be reduced. The overall height of the revolving structure can be reduced, and the viewpoint of the operator appearing in the work vehicle can be lowered, so that a sense of security can be given to the operator.
By extending the front portion of the reservoir tank 43 below the step 20, the capacity of the reservoir tank 43 can be increased, and the distance between the reservoir tank 43 and the control valve disposed in the front column 19 can be shortened. can do. That is, the reservoir tank is disposed in the front-rear direction at one end of the upper surface of the frame, and a part of the reservoir tank is disposed below the step. , The capacity of the reservoir tank can be increased. That is, the width of the swing body can be reduced.
Similarly, by extending the front of the fuel tank 45 below the step 20, the capacity of the fuel tank 45 can be increased and the fuel can be stored at a location remote from the engine 34.
Further, the engine 34, the reservoir tank 43, the radiator 38, the fuel tank 45, and the battery 55 are disposed in the hood, and the reservoir tank 43, the radiator 38, the fuel tank 45, and the battery 55 are located on the side of the revolving unit 2. And maintainability is improved.

Next, the arrangement of the fuel tank 45 and the swing cylinder 32 in the revolving unit 2 will be described.
The fuel tank 45 is provided on the revolving unit 2 on the opposite side of the reservoir tank 43. As shown in FIG. 10, the fuel tank 45 is formed in an L shape in a side view. The front surface of the fuel tank 45 has a shape along the step 20, and the rear surface of the fuel tank 45 has a shape along the rising portion of the bonnet 14.
The fuel supply port of the fuel tank 45 is provided on the upper surface of the fuel tank 45. The upper portion of the fuel tank 45 is disposed on the open side of the bonnet 14, and the bonnet 14 is configured to rotate backward and open. Therefore, when the bonnet 14 is opened, there is an obstacle above the filler port of the fuel tank 45. There is nothing, and the refueling operation can be performed easily.

In the bonnet 14, a shielding plate 50 is disposed on the side of the fuel tank 45 inside the revolving structure.
The shielding plate 50 is formed in a shape along the upper left side surface and the lower rear surface of the fuel tank 45. Thus, the shield plate 50 separates the engine 34 from the fuel tank 45. Further, the shielding plate 50 is configured to partition the inside of the hood 14 in the longitudinal direction of the machine above the right end of the hydraulic pump 35. The shielding plate 50 is fixed to the frame 17 with bolts or the like.

The fuel tank 45 is fixed to the frame 17 by a stay or the like, and the swing cylinder 32 is disposed below the fuel tank 45.
A pivot 46 is inserted into the rear end of the swing cylinder 32, and the swing cylinder 32 is configured to be rotatable about the pivot 46. The lower end and the upper end of the pivot 46 are inserted and fixed in holes provided in the frame 17.
The tip of the cylinder rod of the swing cylinder 32 is connected to the boom bracket 12, and the swing cylinder 32 rotates the boom bracket 12 in the left-right direction.
As described above, since the swing cylinder is disposed in the front-rear direction at one end of the upper surface of the frame, and the fuel tank is disposed above the swing cylinder, the front-rear length of the revolving structure can be effectively used. . Furthermore, the space inside the revolving superstructure can be effectively used, and the engine can be disposed at the left and right center positions.

In the internal structure of the revolving superstructure 2, a radiator 38 is disposed on one of the left and right sides of the engine 34, and a fuel tank 45 is disposed on the other. A reservoir tank 43 is provided below the radiator 38, and a swing cylinder 32 is provided below the fuel tank 45.
As described above, the reservoir is disposed in the front-rear direction at one end of the upper surface of the frame, and the swing cylinder is disposed in the front-rear direction on the other side of the frame, so that the front-rear length of the revolving body can be effectively used. Can be. Furthermore, the space inside the revolving superstructure can be effectively used, and the engine can be disposed at the left and right center positions.
The front part of the reservoir tank 43 and the front part of the fuel tank 45 are arranged below the step 20. Further, the rear or upper portion of the fuel tank 45 is configured along the inside of the rising portion of the bonnet 14.
As described above, the fuel tank is formed in an L-shape when viewed from the side, and the fuel tank is disposed along the rising portion on the bonnet open end side, so that the longitudinal length of the revolving structure can be effectively used. it can. Furthermore, the space inside the revolving superstructure, particularly below the steps, can be effectively used, and the engine can be disposed at the left and right central positions.

Next, the arrangement of the electrical components will be described with reference to FIGS.
In the arrangement within the revolving superstructure 2, the electrical components are disposed at the upper left and right rear sides. A stay 51 fixed to the radiator mount 38b is provided at the left rear portion of the revolving superstructure 2, and an electric component can be fixed to the stay 51.
The radiator mount 38b is bent at the rear portion inside the revolving structure 2 so that hot air does not enter the rear outside of the radiator mount 38b. Further, since the frame 17 is provided below and outside the stay 51, the lower and side portions of the stay 51 are not exposed to hot air.

The air introduced into the revolving unit 2 by the fan 39 is discharged from the revolving unit 2 through the rear opening 52 or the lower opening 53 after cooling the engine 34 and then cooling the muffler 40 or the air cleaner 41. .
The radiator mount 38b also serves as a duct, and supplies cooling air via the radiator 38 to the engine 34. For this reason, the wind through the radiator 38 does not flow into the rear outside of the radiator mount 38b. Then, by attaching the stay 51 to the outside of the radiator mount 38b and disposing the electrical component on the stay 51, it is possible to dispose the electrical component in a space that is not exposed to hot air.

As shown in FIGS. 14 and 15, the right rear portion of the revolving superstructure 2 is separated from the engine 34 by a shield plate 50, and the shield plate 50 blocks cooling air passing through the radiator 38 and the engine 34. Thus, the side of the shield plate 50 opposite to the position where the engine 34 is disposed is not affected by the heat of the engine.
A battery 55 and electrical components are provided outside the shielding plate 50. By arranging the bracket on the outer side surface of the shielding plate 50 and arranging the electric component, the electric component can be arranged in a place not affected by heat.

The battery 55 is mounted on a battery stand 55c, and the battery stand 55c is connected to the shielding plate 50 and the stay 55b. Note that one end of the stay 55b is fixed to the frame 17.
At the rear of the outer surface of the shielding plate 50, a bracket 59 for fixing electrical components is fixed. A fuse box and a current limiter are fixed to the bracket 59.
That is, by arranging the battery 55 and the electric component at the rear right portion of the swing body 2, the electric component and the battery 55 can be surrounded and protected by the shielding plate 50, the hood 14 and the frame 17. For this reason, a member for storing the battery 55 and the electrical components can be omitted, and the configuration inside the revolving superstructure 2 can be made compact.
At the upper right rear part of the revolving superstructure 2, a shielding plate is disposed in the hood, and a battery is disposed in a portion separated from the engine by the shielding plate, and electrical components are disposed immediately after the battery. The length of the front and back of the body can be used effectively. By arranging the electric component and the battery 55 inside the frame 17, the electric component and the battery 55 can be protected from the heat of the engine, and the space in the revolving unit 2 can be effectively used.

1 is an overall side view of a turning work vehicle. FIG. FIG. FIG. The side view which shows a hood rotation structure. FIG. 3 is a plan view showing the internal structure of the revolving superstructure. FIG. FIG. FIG. 3 is a left side view of the engine showing a drive configuration of the fan. FIG. 4 is a right side partial cross-sectional view showing the internal structure of the revolving superstructure. FIG. 5 is a right side partial cross-sectional view showing an arrangement configuration of a shielding plate. The top view which shows the structure of a revolving superstructure left rear part. FIG. The top view which shows the structure of a revolving superstructure right rear part. FIG.

Explanation of reference numerals

2 Revolving superstructure 14 Bonnet 20 Step 34 Engine 38 Radiator 43 Reservoir tank 45 Fuel tank

Claims (3)

  A work machine having a boom rotatably attached to a revolving structure configured to be pivotable, an arm rotatably attached to the boom, and a work attachment rotatably attached to the arm. In an upper body structure of a turning work vehicle in which a hydraulic oil reservoir tank for an engine and a hydraulic device is disposed in a hood at a rear portion of a revolving body, a fuel tank 45 is formed in an L shape in a side view, A radiator 38 disposed on the rear portion of the reservoir tank 43 to form an L-shape when viewed from the side, and a lower part of each of the fuel tank and the reservoir tank is disposed below the step 20; car.   The turning work vehicle according to claim 1, wherein a rear front surface of the fuel tank 45 and a fuel supply port of the reservoir tank 43 are formed along a rising portion of the bonnet 14. The turning work vehicle according to claim 1, wherein the fuel tank (45) and the reservoir tank (43) are disposed on both left and right sides of the engine (34), and the engine is disposed horizontally.