JP2007217919A - Turning work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily attach-detach a relay pipe and an oil cooler for making a hydraulic fluid flow to be returned to a hydraulic fluid tank via the oil cooler from a hydraulic apparatus in a backhoe. <P>SOLUTION: A shroud 37 for guiding cooling air sent to a radiator 12 from a cooling fan 36, is detachably arranged between the cooling fan 36 arranged on right-left one side of an engine 11 mounted on a rear part of a turning table 7 and the radiator 12 positioned on the side of the cooling fan 36. A part of a wall part of this shroud 37 is formed as an oil cooler installing bracket 4 for installing the coil cooler 39 arranged in the shroud 37, and the relay pipe 81 of the hydraulic fluid is fixed to the oil cooler installing bracket 74. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Conventionally, a swivel is provided on a traveling device so as to be rotatable about a vertical swivel axis, and a cooling fan is provided on one of the left and right sides of an engine mounted on the rear of the swivel. There is a turning work machine provided with a radiator on the side and provided with a shroud for guiding cooling air blown from the cooling fan to the radiator between the cooling fan and the radiator (see Patent Documents 1 and 2).

In this turning work machine, in which cooling air is blown from the cooling fan to the radiator, the operation is returned from the control valve that controls the hydraulic equipment installed in the turning work machine to the hydraulic oil tank. An oil cooler for cooling the oil is disposed between the cooling fan and the radiator, that is, in the shroud from the viewpoint of cooling efficiency.
JP-A-8-284660 Japanese Utility Model Publication No. 8-334024

  In the conventional swivel work machine, since the space between the cooling fan and the radiator (in the shroud) is narrow and the oil cooler and the cooling fan are close to each other, the hydraulic oil flow path from the control valve to the oil cooler and If the hydraulic oil distribution path from the oil cooler to the hydraulic oil tank is entirely constituted by a hydraulic hose, the hydraulic hose may come into contact with the cooling fan and be damaged.

  Therefore, the metal relay pipe that relays the return hydraulic oil from the control valve and flows to the oil cooler and the metal relay pipe that relays the hydraulic oil after passing through the oil cooler and flows to the hydraulic oil tank are shroud. The relay pipe and the oil cooler are connected by a hydraulic hose, and the relay pipe and the control valve / hydraulic oil tank are preferably connected by a hydraulic hose. If the oil cooler and the relay pipe are separately mounted by separately providing brackets for attaching the oil cooler, there is a problem that the operation of attaching and detaching the oil cooler and the relay pipe is complicated.

  In addition, since the oil cooler and the relay pipe are disposed in the shroud, when the oil cooler is to be maintained, the oil cooler and the relay pipe are removed after the shroud is removed. It is troublesome to remove the pipe in a narrow place between the cooling fan of the swivel base and the radiator. The assembly of the oil cooler and the relay pipe to the swivel is the same.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a turning work machine in which an oil cooler and a relay pipe are easily attached and detached.

  The technical means taken by the present invention to solve the technical problem includes a swivel provided on a traveling device so as to be rotatable around a vertical swivel axis, and is mounted on the swivel. A cooling fan is provided on the left and right sides of the engine, a radiator is provided on the side of the cooling fan, and a shroud that guides the cooling air sent from the cooling fan to the radiator is attached and detached between the cooling fan and the radiator. An oil cooler is installed in the shroud and part of the shroud wall is used as an oil cooler mounting bracket to attach the oil cooler. From this hydraulic cooler to the hydraulic oil tank through the oil cooler The relay pipe for circulating the working oil to be returned is fixed.

  In addition, the rear part of the swivel base is provided with a weight that constitutes the rear side of the swivel base, and the weight is formed in a circular arc shape in plan view that protrudes rearward, and the engine is disposed on the front side of the weight at the rear part of the swivel It is preferable that the corner portion between the upper surface side and the rear surface side of the shroud be an inclined surface that moves downward as it goes rearward.

According to the present invention, since the relay pipe is fixed to the oil cooler mounting bracket to which the oil cooler is mounted, the oil cooler and the relay pipe can be easily attached and detached, and the number of parts can be reduced.
In addition, the oil cooler mounting bracket and the relay pipe and the oil cooler can be assembled to the shroud outside the swivel, and the shroud can be assembled to the swivel in the assembled state, so that the oil cooler and the relay pipe can be attached to the swivel. Assembling becomes easy, and by removing the shroud from the swivel base, the oil cooler and the relay pipe can be removed from the swivel base together, and the oil cooler and the relay pipe can be easily removed.

  Further, by using a part of the shroud wall part as an oil cooler mounting bracket for mounting the oil cooler, the cost can be reduced by reducing the number of parts.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
2 and 3, reference numeral 1 denotes a backhoe exemplified as a turning work machine. In the present embodiment, an ultra-small turning type backhoe 1 is exemplified.
The backhoe 1 includes a lower traveling device 2 and an upper swing body 3.
The traveling device 2 is constituted by a crawler traveling device driven by a traveling motor composed of a hydraulic motor, and a dozer 4 is provided at the front portion of the traveling device 2, and the blade of the dozer 4 is constituted by a dozer cylinder composed of a hydraulic cylinder. It is swung up and down.

  The swivel body 3 is supported on the travel device 2 via a swivel bearing 6 so as to be pivotable around a swivel axis X in the vertical direction, and a swivel base 7 swiveled in both left and right directions by a swivel motor composed of a hydraulic motor. , The excavator 8, the driver's seat 9, the canopy 10, the engine 11 and the radiator 12 and the like, the tanks such as the fuel tank 13 and the hydraulic oil tank 14, etc.

The excavator 8 includes a boom 16 whose lower end is pivotally supported on the swivel 7, an arm 17 pivotally connected to the upper end of the boom 16, and a bucket swingably attached to the distal end side of the arm 17. 18, a boom cylinder 19 that swings the boom 16, an arm cylinder 20 that swings the arm 17, and a bucket cylinder 21 that swings the bucket 18.
Further, in the present embodiment, the boom 16 has a four-bar parallel link mechanism that supports the arm 17 and the bucket 18 so as to be movable in parallel from side to side, and the arm 17 and the bucket 18 can be translated from side to side by the offset cylinder 22. An offset type boom 16 is configured.

The boom cylinder 19, the arm cylinder 20, the bucket cylinder 21, and the offset cylinder 22 are constituted by hydraulic cylinders.
The driver's seat 9 and the canopy 10 are arranged on the left side portion of the swivel base 7, and on the front side of the driver's seat 9, the excavator operation lever 24 for operating the excavator 8 and the travel device operation for operating the travel device 2 are operated. A control device 27 having a lever 26 is arranged.

  The swivel base 7 is configured in a substantially circular shape in plan view. As shown in FIGS. 4 to 7, the swivel frame 28 serving as a skeleton and the rear end side of the swivel frame 28 are attached to the swivel base 7. A weight (protector) 29 that is configured in an arc shape that protrudes rearward in plan view to form a rear portion and that balances the weight with the excavator 8, a middle portion on the left and right side surfaces of the revolving frame 28, and a front portion The main structure includes a revolving cover that covers the front side, a step 31 that covers the upper surface of the revolving frame 28 on the front side of the driver's seat 9, and the like.

  The swivel frame 28 has a swivel board 32 made of a thick plate that constitutes the bottom of the swivel base 7, and a pair of left and right sides extending forward from the front-rear direction center side is located near the right-left center of the swivel board 32. A vertical rib 33 is provided, and a boom mounting portion 34 is provided between the left and right vertical ribs 33 so that the base portion of the boom 16 of the excavator 8 and one end side of the boom cylinder 19 are rotatably attached around the left and right axes.

  The engine 11 is disposed horizontally on the rear portion of the swivel board 32 so that the axis of the crankshaft is in the left-right direction, and a cooling fan 36 is provided on the right side (right and left sides) of the engine 11. A radiator 12 is arranged on the right side of 36, and a shroud 37 for guiding cooling air sent from the cooling fan 36 to the radiator 12 is provided between the cooling fan 36 and the radiator 12. In the shroud 37 between the radiator 12 and the hydraulic equipment (boom cylinder 19, arm cylinder 20, bucket cylinder 21, offset cylinder 22, swing motor, travel motor, dozer cylinder, etc.) installed in the backhoe 1 is controlled. An oil cooler 39 for cooling the hydraulic oil returned from the control valve to the hydraulic oil tank 14 is disposed. That.

The control valve is a collection of control valves for controlling the hydraulic equipment installed in the backhoe 1, and is disposed on, for example, the swivel board 32 below the control device 27.
A hydraulic pump 40, a muffler 41, an air cleaner 42, and the like are provided on the left side (left and right other sides) of the engine 11.
The hydraulic oil in the hydraulic oil tank 14 is sent to a control valve by a hydraulic pump 40, and is supplied from the control valve to various hydraulic devices equipped in the backhoe 1, and the return hydraulic oil from the hydraulic device is a control valve. To the hydraulic oil tank 14 through the oil cooler 39.

A fuel tank 13 disposed on the front side and a hydraulic oil tank 14 disposed on the rear side of the fuel tank 13 on the right side of the right side of the swivel board 32 (on the right side of the boom mounting portion 34). The battery 43 is disposed above the hydraulic oil tank 14, and the radiator 12 is disposed behind the hydraulic oil tank 14 and the battery 43.
The engine 11, the radiator 12, the fuel tank 13, the hydraulic oil tank 14, the battery 43, and the like protrude upward from the upper surface of the step 31 of the swivel base 7, and the engine 11 and its peripheral devices are covered with a hood 46 that constitutes an engine room. The radiator 12, the fuel tank 13, the hydraulic oil tank 14, and the battery 43 are covered with a right side cover body 47.

The bonnet 46 has a back cover 48 that covers the back side of the engine room so that it can be opened and closed, and a left side cover 49 that covers the left side of the engine room so that it can be opened and closed, and the right side cover body 47 includes the radiator 12 and the fuel tank. 13. An opening / closing lid 50 is provided for closing the hydraulic oil tank 14 and the upper side of the battery 43 so as to be freely opened and closed.
Further, a discharge port 51 for discharging the cooling air after passing through the oil cooler 39 and the radiator 12 to the outside of the right side cover body 47 is provided in a portion of the right side cover body 47 located on the right side of the radiator 12. Is provided.

The shroud 37 is configured by combining plate materials.
As shown in FIGS. 1 and 8 to 14, the shroud 37 includes a side wall 52 constituting the left side surface of the shroud 37, an upper surface wall 53 constituting the upper surface side of the shroud 37, and the lower surface side of the shroud 37. A bottom wall 54 constituting the front surface, a front wall 55 constituting the front surface side of the shroud 37, a rear wall 56 constituting the rear surface side of the shroud 37, and a corner portion between the rear surface side and the upper surface side of the shroud 37. The rear upper corner wall 57 is provided, and the right side surface of the shroud 37 is open.

The right side surface of the shroud 37 is closed by the radiator 12, and the radiator 12 is detachably attached to a mounting base 58 provided on the turning substrate 32.
The side wall 52 of the shroud 37 is arranged so as to overlap the cooling fan 36 in the left-right direction, and a circular insertion port 59 for inserting the cooling fan 36 is formed in the side wall 52.

The upper surface wall 53 extends rightward from the upper edge of the side wall 52, and the lower surface wall 54 extends rightward from the lower edge of the side wall 52.
The corner portion between the rear edge and the upper edge of the side wall 52 is cut in an inclined shape that moves downward as it goes rearward, and the rear upper corner wall 57 is provided along the cut portion 52a. The upper side of the rear upper corner wall 57 is fixed to the rear edge side of the upper surface wall 53.

Accordingly, the rear upper corner wall 57 is provided with an inclined shape that moves downward as it goes rearward, and an inclined surface that moves downward as the corner portion between the upper surface side and the rear surface side of the shroud 37 goes backward. Has been.
The lower edge 57a side of the rear upper corner wall 57 is formed narrower than the upper edge 57b side, and the right edge 57c of the rear upper corner wall 57 is inclined so as to move to the left as it goes downward. Is formed.

  By the way, in the backhoe 1, when attaching and detaching the weight 29 constituting the rear side of the swivel base 7, eyebolts or the like are respectively provided in the screw holes 60 provided on the left and right sides of the upper surface of the weight 29. The end of a weight suspension rope is engaged with the right and left engagement fasteners, and a crane hook is hooked on the rope to lift the weight 29. The upper surface of the shroud 37 When the corner portion between the side and the rear surface intersects perpendicularly, the suspension rope comes into contact with the corner portion between the upper surface side and the rear surface side of the shroud 37. In some cases, the shroud 37 may have to be removed.

  However, in the shroud 37 of the present embodiment, the corner portion between the upper surface side and the rear surface side of the shroud 37 is an inclined surface that moves downward as it goes rearward, and the rope for weight suspension Since the contact portion is cut in shape, the weight suspension rope is prevented from coming into contact with the shroud 37, and it is not necessary to remove the shroud 37 when the weight 29 is attached / detached. improves.

Further, the corner portion between the upper surface side and the rear surface side of the shroud 37 is an inclined surface and the corner portion where the flow of the cooling air is stagnated is eliminated, whereby the cooling air can be smoothly guided to the radiator 12, thereby improving the cooling performance. Has improved.
A pair of front and rear mounting plates 61 are fixed to the upper surface of the upper surface wall 53 of the shroud 37 so as to protrude upward. The front and rear mounting plates 61 are detachably attached to a partition wall 62 that partitions the engine room and the radiator 12 by bolts. Is attached.

An extending attachment piece 63 is provided above and below the right edge of the upper surface wall 53, and an extending attachment piece 63 is provided below and above the right edge of the bottom wall 54. These upper and lower attachment pieces 63 are detachably attached to the radiator 12 from the left side surface of the radiator 12 by bolts.
The shroud 37 can be removed from the turning frame 28 by removing the attachment portions of the attachment plate 61 and the attachment piece 63.

  Further, the corner portion between the front edge and the upper edge of the side wall 52 of the shroud 37 is cut into an inclined shape that moves downward as it goes forward, and the front left side of the top wall 53 is the front of the side wall 52. A rectangular shape is cut from the upper end of the upper cut portion 52b to the front end of the upper surface wall 53, and the upper left side of the front wall 55 is rectangular from the lower end of the front upper cut portion 52b of the side wall 52 to the upper end of the front wall 55. An inclined front upper corner wall 66 is provided which is cut into a shape and transitions downward from the rear edge of the notch 64 of the upper surface wall 53 to the lower edge of the notch 65 of the front wall 55. Yes.

A triangular closing wall 67 extends from the right edge of the front upper corner wall 66 to the right edge of the notch 64 on the top wall 53 and the right edge of the notch 65 on the front wall 55.
With the above configuration, the cooling performance is improved by reducing the corner portion of the corner portion between the upper surface side and the front surface side of the shroud 37 on the left side of the front corner portion of the shroud 37.

  Further, the corner portion between the front edge and the lower edge of the side wall 52 of the shroud 37 is cut into an inclined shape that moves upward as it goes forward, and the lower left side of the front wall 55 is the lower front portion of the side wall 52. The cut portion 52c is cut out in a triangular shape that expands downward from the upper end side to the lower end of the front wall 55, and the front left side of the lower surface wall 54 is behind the front lower cut portion 52c of the side wall 52. From the end to the front end of the lower surface wall 54, it is cut out in a triangular shape that expands as it goes forward.

Further, on the left side of the corner portion between the lower surface side and the front surface side of the shroud 37, there are a side along the cut portion 52c of the side wall 52 and a side along the oblique side of the cutout portion 68 below the front wall 55. A triangular lower front corner wall 71 having a side along the oblique side of the notch 69 of the lower surface wall 54 is provided.
With the above-described configuration, the cooling performance is improved by reducing the corner portion of the corner portion between the lower surface side and the front surface side of the shroud 37 on the left side of the front corner portion of the shroud 37.

  The rear wall 56 constituting the rear surface side of the shroud 37 is integrally formed with the vertical wall 72 provided from the lower edge 57a of the rear upper corner wall 57 to the left side of the rear edge of the lower wall 54, and the vertical wall 72. A mounting wall 73 provided along the right side edge of the vertical wall 72 and the right side edge 57c of the rear upper corner wall 57, and the mounting wall 73 is detachably mounted from the rear side of the shroud 37 with bolts. An oil cooler mounting bracket 74 to which the oil cooler 39 is mounted is configured.

Therefore, a part of the wall portion constituting the shroud 37 is an oil cooler mounting bracket 74 for mounting the oil cooler 39, and cost reduction is achieved by sharing the members.
The oil cooler mounting bracket 74 is overlapped with the mounting wall 73 and is detachably mounted by bolts, and the openings 77a to c formed at the upper, middle and lower portions of the main plate 76 are closed. The cover plate 78 is detachably attached to the back side of the main plate 76 and an oil cooler attachment stay 79 fixed to the main plate 76.

The mounting wall 73, the main plate 76, and the cover plate 78 are formed in an inclined shape that moves forward as going to the right in order to guide the cooling air from the cooling fan 36 to the radiator 12.
Further, the mounting wall 73, the main plate 76, and the cover plate 78 are inclined so as to move forward as they go rightward, so that they can be disposed close to the arc-shaped weight 29.

Further, in the present embodiment, since the openings 77a to 77c are formed in the main plate 76, the lid plate 78 is removed from the main plate 76, so that the inside of the shroud 37 is opened via the openings 77a to 77c. Can remove dust, dust, etc.
The main plate 76 and the cover plate 78 may be formed of a single plate material.
The oil cooler mounting stay 79 is fixed to the wall portion between the upper opening 77a and the middle opening 77b of the main plate 76 and the wall portion between the lower opening 77c and the middle opening 77b. The rear side of the oil cooler 39 is detachably attached to the upper and lower oil cooler attachment stays 79 by bolts.

The front side of the oil cooler 39 is detachably attached to a pair of upper and lower oil cooler mounting stays 80 fixed to the rear surface of the front wall 55 of the shroud 37 with bolts.
Since the space between the cooling fan 36 and the radiator 12 (in the shroud 37) is narrow and the oil cooler 39 and the cooling fan 36 are close to each other, the hydraulic oil distribution path from the control valve to the oil cooler 39 and the operation from the oil cooler 39 are performed. If all of the hydraulic oil flow path leading to the oil tank is configured by a hydraulic hose, the hydraulic hose may come into contact with the cooling fan 36 and be damaged.

Therefore, in the backhoe 1 of the present embodiment, a metal made for circulating the return hydraulic oil returned from the control valve to the hydraulic oil tank 14 through the oil cooler 39 to the rear side of the oil cooler 39. A pair of relay pipes 81 are arranged, and the pair of relay pipes 81 are fixed to and integrated with the oil cooler mounting bracket 74 by welding or the like.
One of the pair of relay pipes 81 is an inlet relay pipe 81 through which hydraulic oil sent from the control valve to the oil cooler 39 circulates, and the other is sent from the oil cooler 39 to the hydraulic oil tank 14. An outlet relay pipe 81 through which oil is circulated.

  The pair of relay pipes 81 includes a vertical pipe portion 82 arranged in the vertical direction and a horizontal pipe portion 83 extending rightward from the upper end of the vertical pipe portion 82, and the upper ends of the pair of relay pipes 81. The port on the side is connected to the oil cooler 39 via a hydraulic hose, the port on the lower end side of the relay pipe 81 for inlet is connected to the control valve via the hydraulic hose, and the port on the lower end side of the relay pipe 81 for outlet Is connected to the hydraulic oil tank 14 via a hydraulic hose.

  Further, the vertical pipe portion 82 of the left relay pipe 81 is long in the vertical direction so as to extend from the lower end side to the upper portion of the oil cooler mounting bracket 74, and the horizontal pipe portion 83 of the left relay pipe 81 is the oil cooler. 39, the vertical pipe portion 82 of the right relay pipe 81 is formed to be short in the vertical direction and disposed below the oil cooler mounting bracket 74, and the horizontal pipe of the right relay pipe 81 The part 83 is connected to the connection port on the lower side of the oil cooler 39.

The vertical pipe portion 82 of the left relay pipe 81 is fixed to the extension wall 84 extending from the lower edge of the main plate 76 of the oil cooler mounting bracket 74 and the upper and lower oil cooler mounting stays 79 by welding or the like. The vertical pipe portion 82 of the right relay pipe 81 is fixed to the extension wall 84 and the plate 87 fixed to the main plate 76 by welding or the like.
The lower ends of both relay pipes 81 extend downward from the oil cooler mounting bracket 74, and the rear side of the lower surface wall 54 of the shroud 37 is notched to avoid interference with both relay pipes 81. A portion 85 is formed.

A fan guard 86 for protecting the cooling fan 36 is attached to the upper part of the rear portion of the shroud 37.
In the shroud 37 having the above-described configuration, the oil cooler 39 and the relay pipe can be easily assembled by assembling the oil cooler mounting bracket 74, the relay pipe 81, and the oil cooler 39 to the shroud 37 outside the swivel base 7.

Further, by removing the shroud 37 from the swivel base 7, the oil cooler 39 and the relay pipe 81 can be removed together from the swivel base 7, and the oil cooler 39 and the relay pipe 81 can be easily removed.
Further, since the relay pipe 81 for circulating the return hydraulic oil from the hydraulic equipment is made of metal and disposed in the shroud 37, the return hydraulic oil is also supplied to the relay pipe 81 by the cooling air from the cooling fan. It is cooled, thereby improving the cooling efficiency.

It is a top view which shows arrangement | positioning of a cooling fan, a radiator, an oil cooler, and a shroud. It is a left view of a backhoe. It is a top view of a turntable. It is a top view, such as a turntable frame. It is a right view of a turntable. It is a top view of a swivel stand rear part. It is a rear view of a turntable. It is a right view of a shroud. It is a rear view, such as a shroud. It is a front view of a shroud. (A) is a bottom view of the shroud, (b) is a plan view of the shroud. It is a right view of the side wall of a shroud, an upper surface wall, and a lower surface wall. It is the figure which looked at the oil cooler mounting bracket from the back right diagonally rear side. (A) is a top view of FIG. 13, (b) is an AA arrow directional view of FIG. 13, (c) is a bottom view of FIG.

Explanation of symbols

2 traveling device 7 swivel base 11 engine 12 radiator 29 weight 36 cooling fan 37 shroud 39 oil cooler 74 oil cooler mounting bracket 81 relay pipe X pivot axis

Claims (2)

  A swivel base (7) is provided on the traveling device (2) so as to be rotatable about a vertical swivel axis (X). The engine (11) mounted on the swivel base (7) A cooling fan (36) is provided on the side, a radiator (12) is provided on the side of the cooling fan (36), and the cooling fan (36) is provided between the cooling fan (36) and the radiator (12). A shroud (37) for guiding cooling air blown to the radiator (12) is detachably provided, an oil cooler (39) is disposed in the shroud (37), and a part of a wall portion of the shroud (37) is provided. Is the oil cooler mounting bracket (74) for mounting the oil cooler (39), and the oil cooler mounting bracket (74) is returned from the hydraulic equipment to the hydraulic oil tank (14) through the oil cooler (39). Swivel work machine, characterized in that fixing the relay pipe (81) for the passage of hydraulic fluid.   A weight (29) constituting a rear surface side of the swivel base (7) is provided at the rear part of the swivel base (7), and the weight (29) is formed in a circular arc shape in a plan view projecting backward, The engine (11) is disposed on the front side of the weight (29) at the rear part of the swivel base (7), and has an inclined surface that moves downward as it goes rearward in the corner portion between the upper surface side and the rear surface side of the shroud (37). The turning work machine according to claim 1, wherein

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