JP3950974B2 - Swivel work vehicle - Google Patents

Description

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

  Conventionally, in an excavation type turning work vehicle, attempts have been made to make the upper turning body compact. For example, it is shown by Unexamined-Japanese-Patent No. 11-303139. This is a small hydraulic excavator such as a small swivel excavator, and when the engine or the like is arranged at the rear of the upper revolving structure, the arrangement position is restricted by the vertical plate disposed on the revolving structure frame. The upper swivel body is an intermediate strength member that is erected by connecting a pair of left and right front strength members erected in the longitudinal direction of the upper revolving body and a pair of vertical plates, and being connected to the rear ends of the vertical plates. 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 devices such as an engine, hydraulic pump, hydraulic oil tank for hydraulic equipment, radiator, fuel tank, and battery are installed inside the turning body of the turning work vehicle, and these are affected by the heat from the engine. In consideration of this, it has been difficult to arrange the revolving unit compactly in order to reduce the size of the revolving unit.

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

The engine (34), the hydraulic pump (35), the swing cylinder (32), and the reservoir tank (43) are arranged on the frame (17) in the bonnet (14) at the rear of the revolving structure (2) configured to be capable of turning. In the configuration, the engine (34) is placed horizontally, a reservoir tank (43) is placed on one side of the engine (34) , and a radiator (38) is placed above and below the reservoir tank (43). The fuel tank (45) and the battery (55) are arranged at the front and rear positions on the other side of the engine (34), and the muffler (40) is arranged at the rear of the engine (34). A shielding plate (50) is disposed between the fuel tank (45) and the battery (55) and the engine (34) in the longitudinal direction of the fuselage.

As effects of the present invention, the following effects can be obtained.
The engine (34), the hydraulic pump (35), the swing cylinder (32), and the reservoir tank (43) are arranged on the frame (17) in the bonnet (14) at the rear of the revolving structure (2) configured to be capable of turning. In the configuration, the engine (34) is placed horizontally, a reservoir tank (43) is placed on one side of the engine (34) , and a radiator (38) is placed above and below the reservoir tank (43). The fuel tank (45) and the battery (55) are arranged at the front and rear positions on the other side of the engine (34), and the muffler (40) is arranged at the rear of the engine (34). a fuel tank (45) and the battery (55), between the engine (34), so arranged shielding plate (50) toward the vehicle body front-rear direction can be arranged an engine in the middle of the swing body, turning body Small in size It can be configured to compact.

  Further, the engine can be arranged at the center of the revolving structure, the muffler can be arranged at the rear part thereof, and the reservoir tank, the radiator, the fuel tank, and the battery are located at the side parts, thereby improving maintainability. And a revolving body can be constituted small and compact.

Moreover, an engine and a fuel tank can be isolated by a shield.
In addition, the revolving structure can be made compact and compact.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 is an overall side view of a turning work vehicle, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a rear view.

  FIG. 5 is a side view showing the bonnet rotation configuration, FIG. 6 is a plan view showing the internal configuration of the revolving structure, FIG. 7 is also a rear view, and FIG. 8 is a left side view.

  FIG. 9 is a left side view of the engine showing the fan driving configuration, and FIG. 10 is a partial right side sectional view showing the internal structure of the revolving structure.

  FIG. 11 is a partial right side sectional view showing the arrangement configuration of the shielding plate, and FIG. 12 is a plan view showing the configuration of the left rear portion of the revolving structure.

  13 is also a left side partial cross-sectional view, FIG. 14 is a plan view showing the configuration of the right rear portion of the revolving structure, and FIG. 15 is also a right side partial cross-sectional view.

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 turning body 2 at the center of the upper portion of the crawler type traveling device 1 so as to be able to turn left and right. is doing. A bonnet 14 that covers the engine or the like is disposed above the revolving body 2, and a seat 16 is attached above the bonnet 14. In front of the seat 16, a driving operation unit 15 configured by arranging levers for performing a driving operation on the front column 19 is provided. A step 20 is disposed between the front column 19 and the bonnet 14 of the driving operation unit 15.

A boom bracket 12 is attached to the front end portion of the swing body 2 so as to be pivotable in the left-right direction, and the lower end portion of the boom 6 is supported on the boom bracket 12 so as to be pivotable up and down.
The boom 6 is bent forward in the middle, and is formed in a substantially “<” shape having a bent portion 6 d in a side view. An arm 5 is rotatably supported at the upper end of the boom 6, and a bucket 4 as a work attachment is rotatably supported at the tip of the arm 5. The boom 7, the arm 5, the bucket 4, and the like constitute a work machine 7.

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, arm cylinder 10, and bucket cylinder 9 are configured as hydraulic cylinders, and each cylinder 9, 10, 11 supplies pressure oil from a hydraulic pump disposed in the hood 14 of the swivel base 2 through a hydraulic hose. By doing so, it is driven to extend and contract.
Further, the boom cylinder 11 is interposed between the cylinder support portion 12b of the boom bracket 12 and the boom cylinder bracket 36 provided on the middle front surface of the boom 6, and the arm cylinder 10 is provided on the middle rear surface of the boom 6. An arm cylinder bottom bracket 31 is interposed between the bucket cylinder bracket 30 provided at the base end portion 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. Has been.

  An opening 31 is provided in the lower part of the swing body 2, and the cylinder rod of the swing cylinder 32 protrudes from the opening 31. The rear end of the swing cylinder 32 is pivotally supported by the frame 17 of the swing body 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 swing body 2 by the swing cylinder 32.

  The frame 17 is configured integrally with a counterweight at the rear of the revolving unit 2. The frame 17 pivotally supports the boom bracket 12 at the front, and constitutes a counterweight at the rear. The boom bracket 12 is pivotally supported at the front portion of the frame 17 so as to be rotatable. The central part of the frame 17 constitutes the lower part of the revolving structure 2 and connects the rear counterweight part.

  The revolving body 2 is provided with a side opening 14b at the side, and a rear opening 52 and a lower opening 53 are provided at the rear. The side opening 14 b is provided on the left side of the bonnet 14. A radiator is disposed inside the side opening 14b, and is cooled by the air sucked from the side opening 14b. The rear opening 52 is provided above the rear part of the frame 17, and the lower opening 53 is provided at the lower rear part of the frame 17. The air introduced from the side opening 14b is discharged from the revolving structure 2 through the rear opening 52 and the lower opening 53.

  As shown in FIG. 5, the bonnet 14 disposed in the revolving structure 2 is configured to be rotatable rearward. The bonnet 14 is pivotally connected to the rear upper part of the frame 17 at the rear lower part. When the bonnet 14 is closed, the bonnet 14 is locked by a locking tool or the like at a position where the lower end of the bonnet 14 contacts the step 20 and is held in the closed state. When the engine or the like is to be serviced, the locking tool or the like is released and the bonnet 14 is rotated rearward.

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

  The engine 34 disposed inside the revolving structure 2 is disposed on the frame 17 via a rubber mount or a vibration isolator laminated rubber. A hydraulic pump 35 is connected to the 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 out of the revolving structure 2 through the muffler 40 disposed behind the engine 34. The muffler 40 is configured in an elliptical column shape, and exhaust gas is introduced from above and discharged downward.

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

  A radiator 38 is disposed on the opposite side of the engine 34 to which the hydraulic pump 35 is connected, and a fan 39 is disposed 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 on the upper side of 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 the cooling air introduced by the fan 39.

  The radiator 38 is arranged on the side of the fan 39, and is arranged so that the arrangement position of the radiator 38 in side view overlaps the arrangement 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 shortened.

  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 and cooled in the radiator 38 is returned again into the water jacket of the engine 34. The radiator 38 is disposed on the inner side surface of the revolving structure 2 toward the outside. The radiator 39 takes in outside air into the bonnet 14 by the fan 39 and cools the radiator 38. The outside air introduced into the inner side of the bonnet 14 cools the upper cylinder head of the engine 34 after cooling the radiator 38. It is disposed on the side of the fan 39 and is disposed so that the position of the side view radiator 38 overlaps with the position of the fan 39, and the radiator 38 is disposed immediately before the fan 39. Thereby, the distance from the radiator 38 to the engine 34 can be shortened.

  A muffler 40 is disposed 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 arranged in the vertical direction in the revolving structure 2. Exhaust gas discharged from the exhaust port at the top of the engine 34 is introduced from the top of the muffler 40 and is discharged from the bottom of the muffler 40. The exhaust gas discharge part of the muffler 40 coincides with the lower opening 53 provided at the lower rear part of the frame 17, and the exhaust gas of the engine 34 is passed through the muffler 40 from the lower opening 53 of the revolving body 2. 2 is discharged outside. An air cleaner 41 is disposed above the muffler 40, and the air inlet 42 of the air cleaner 41 is disposed in the revolving structure 2 on the side opposite to the position where the radiator 38 is disposed. Air introduced into the air cleaner 41 from the intake port 42 is introduced into the intake port of the engine 34.

A reservoir tank 43 is disposed in the front-rear direction of the swing body 2 on the side of the swing body 2 where the radiator 38 is provided. The reservoir tank 43 stores hydraulic oil for the hydraulic pump 35 and is connected to the hydraulic pump 35 by hydraulic piping. The reservoir tank 43 is fixed on the frame 17, and a radiator 38 is disposed on the rear upper surface of the reservoir tank 43. A step 20 is formed above the front portion of the reservoir tank 43. An oil filter 44 is disposed 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 hydraulic oil that returns to the reservoir tank 43 via the control valve returns to the reservoir tank 43 via the oil filter 44. .
Thus, it has a boom rotatably attached to a revolving structure configured to be rotatable, 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 having a working machine and having a reservoir tank for hydraulic oil for engine and hydraulic equipment disposed in a bonnet at the rear of the turning body, a reservoir tank is provided in the front and rear direction at one end of the upper surface of the frame. Since it is disposed, the lateral width of the reservoir tank can be shortened, and the space inside the revolving structure can be used effectively. 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. It is possible to arrange the engine at the left and right center position of the revolving structure. Further, since the reservoir tank also serves as a radiator mounting table, the radiator can be disposed in a space-saving manner, and the radiator can be disposed at a height position above the engine with an easy configuration, so that the cooling efficiency can be improved.

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

In the revolving structure 2, a reservoir tank 43, a radiator 38, a fuel tank 45, and a battery 55 are housed in the longitudinal length of the engine 34. Thereby, the internal structure of the revolving structure 2 can be made compact, and mass concentration can be performed at the rear part of the revolving structure 2. In addition, heavy objects can be disposed in the vicinity of the engine in the revolving structure, and these heavy objects are disposed on the counterweight side. Thereby, a heavy object can be concentrated on the rear part of a revolving structure, and the weight balance of this revolving structure can be maintained favorable. The entire width of the revolving structure can be shortened. The overall height of the revolving structure can be made low, the viewpoint of the operator appearing on the work vehicle can be lowered, and the operator can feel secure.
The capacity of the reservoir tank 43 can be increased by extending the front portion of the reservoir tank 43 below the step 20, and the distance between the reservoir tank 43 and the control valve disposed in the front column 19 is shortened. can do. That is, a reservoir tank is arranged in the front-rear direction at one end of the upper surface of the frame, and a part of the reservoir tank is arranged below the step. Can be used to increase the capacity of the reservoir tank. That is, the width of the revolving structure can be reduced.
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 away 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 bonnet, and the reservoir tank 43, the radiator 38, the fuel tank 45, and the battery 55 are located on the side of the revolving structure 2. , Improving maintainability.

Next, the arrangement configuration of the fuel tank 45 and the swing cylinder 32 in the revolving structure 2 will be described.
The fuel tank 45 is disposed on the opposite side of the reservoir tank 43 in the revolving structure 2. As shown in FIG. 10, the fuel tank 45 is configured in an L shape in side view. The upper surface of the fuel tank 45 has a shape along the step 20, and the rear front surface has a shape along the rising portion of the bonnet 14. The fuel inlet of the fuel tank 45 is disposed on the upper surface of the fuel tank 45. The upper part of the fuel tank 45 is disposed on the open side of the bonnet 14, and the bonnet 14 is configured to rotate and open rearward. Therefore, when the bonnet 14 is opened, there is an obstacle above the fuel filler opening of the fuel tank 45. There is no object 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 configured in a shape along the upper left side and the lower rear side of the fuel tank 45. Thereby, the shielding plate 50 isolates the engine 34 and 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 body above the right end portion 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 a 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 boom bracket 12 is rotated in the left-right direction by the swing cylinder 32. 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 used effectively. . Furthermore, the space inside the revolving structure can be used effectively, and the engine can be arranged at the left and right central positions.

  In the internal structure of the revolving structure 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 disposed below the radiator 38, and a swing cylinder 32 is disposed 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. Can do. Furthermore, the space inside the revolving structure can be used effectively, and the engine can be arranged at the left and right central 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 in a side view, and the fuel tank is disposed along the rising portion on the bonnet open end side, so that the longitudinal length of the revolving body can be effectively used. it can. Furthermore, the space inside the revolving structure, particularly the space below the step can be used effectively, and the engine can be arranged at the center of the left and right.

Next, the arrangement configuration of the electrical components will be described with reference to FIGS.
In the arrangement configuration in the swivel body 2, the electrical components are arranged at the upper left and right rear. A stay 51 fixed to the radiator mount 38 b is disposed at the left rear portion of the revolving structure 2, and an electrical component can be fixed to the stay 51. The radiator mount 38b is bent to the inside of the swivel body 2 at the rear, and has a structure in which hot air does not enter the rear outside of the radiator mount 38b. Further, since the frame 17 is disposed 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 structure 2 by the fan 39 is discharged to the outside of the revolving structure 2 from the rear opening 52 or the lower opening 53 after the muffler 40 or the air cleaner 41 is cooled after the engine 34 is cooled. . The radiator mount 38b also serves as a duct and supplies cooling air to the engine 34 via the radiator 38. For this reason, the wind via the radiator 38 does not flow into the rear outer side 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, the electrical component can be disposed in a space that is not exposed to hot air.

  As shown in FIGS. 14 and 15, the right rear portion of the revolving structure 2 is isolated from the engine 34 by the shielding plate 50, and the cooling air through the radiator 38 and the engine 34 is blocked by the shielding plate 50. As a result, the side opposite to the position where the engine 34 is disposed of the shielding plate 50 is not affected by the heat of the engine. A battery 55 and electrical components are disposed outside the shielding plate 50. By disposing the bracket on the outer side surface of the shielding plate 50 and disposing the electrical component, the electrical component can be disposed in a place where it is not affected by heat.

  The battery 55 is placed on the battery base 55c, and the battery base 55c is connected to the shielding plate 50 and the stay 55b. Note that one end of the stay 55 b is fixed to the frame 17. A bracket 59 for fixing electrical components is fixed to the rear portion of the outer surface of the shielding plate 50. The bracket 59 is for fixing a fuse box and a current limiter. That is, by disposing the battery 55 and the electrical component on the right rear portion of the revolving structure 2, the electrical component and the battery 55 can be surrounded and protected by the shielding plate 50, the bonnet 14, and the frame 17. For this reason, the member which stores the battery 55 and the electrical equipment can be omitted, and the configuration inside the revolving structure 2 can be made compact. In the upper right rear part of the swivel body 2, a shielding plate is disposed in the bonnet, a battery is disposed in a portion separated from the engine by the shielding plate, and an electrical component device is disposed immediately after the battery. The front and back length of the body can be used effectively. By disposing the electrical component and the battery 55 inside the frame 17, the electrical component and the battery 55 can be protected from the hot air of the engine, and the space in the revolving structure 2 can be used effectively.

The whole side view of a turning work vehicle. FIG. Similarly front view. Similarly rear view. The side view which shows a bonnet rotation structure. The top view which shows a turning body internal structure. Similarly rear view. Similarly left side view. The left view of the engine which shows the drive structure of a fan. The partial cross section of the right side which shows a revolving structure internal structure. The partial cross section of the right side which shows the arrangement configuration of a shielding board. The top view which shows the structure of the turning body left rear part. The left side partial sectional view. The top view which shows the structure of the turning body right rear part. The right side surface partial sectional view.

Explanation of symbols

2 Rotating body 14 Bonnet 17 Frame 34 Engine 35 Hydraulic pump 38 Radiator 40 Muffler 43 Reservoir tank 45 Fuel tank 50 Shield plate 55 Battery

Claims (1)

The engine (34), the hydraulic pump (35), the swing cylinder (32), and the reservoir tank (43) are arranged on the frame (17) in the bonnet (14) at the rear of the revolving structure (2) configured to be capable of turning. In configuration,
The engine (34) is placed horizontally, a reservoir tank (43) is placed on one side of the engine (34) , and a radiator (38) is stacked on the reservoir tank (43) in the vertical position. And place
A fuel tank (45) and a battery (55) are arranged at the front and rear positions on the other side of the engine (34), and a muffler (40) is arranged at the rear of the engine (34).
A turning work vehicle characterized in that a shielding plate (50) is disposed between the fuel tank (45) and the battery (55) and the engine (34) in the longitudinal direction of the machine body.