JP6483232B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine such as a backhoe.

Conventionally, there is a tank device disclosed in Patent Document 1 as a tank device mounted on a backhoe.
In the thing of this patent document 1, the tank fixing board material for attaching and fixing this tank to the bottom face side of a tank is provided in front and back. The tank fixing plate member has a superposed portion superimposed on the bottom surface of the tank and a bolt fixing portion protruding from the front and rear outer edges of the bottom surface of the tank. Bolt holes for inserting the tank fixing bolts are formed in the bolt fixing portions of the tank fixing plate material.

  The tank is fixed to the tank mount. The tank mount has a mounting fixing plate for mounting and fixing the hydraulic oil tank. The bolt fixing portion of the tank fixing plate material is superimposed on the mounting fixing plate of the tank mounting base from above, and is fastened and fixed to the mounting fixing plate via the tank fixing bolt.

JP 2010-168838 A

In the prior art, as shown in FIG. 14, the overlapping portion 122 of each of the front and rear tank fixing plate members 121 is welded to the bottom surface 123 of the tank T at the edge portion in the front-rear direction Y, and the bolt fixing portion. A corner portion between the upper surface 124a of the tank T and the front and rear surfaces 125F and 125R of the tank T is welded (this welded portion is indicated by reference numeral 126).
When the bolt fixing portion 124 is welded at a corner portion between the upper surface 124a and the front and rear surfaces 125F and 125R of the tank T, the bolt fixing portion 124 is distorted in the direction Z in which the bolt fixing portion 124 jumps up. If the bolt fixing portion 124 is distorted in the direction Z in which the bolt fixing portion 124 jumps up, stress is generated in the welded portion 126 when the bolt fixing portion 124 is bolted to the mounting fixing plate 128 of the tank mounting base. End up.

This stress causes the tank fixing plate 121 to break from the welded portion 126 due to tensile stress.
Further, in order to reduce the stress, the welded portion 126 and the bolt hole 127 need only be separated from each other. However, there may be a case where the distance between the welded portion 126 and the bolt hole 127 cannot be sufficiently secured due to restrictions on the mounting space of the tank T. is there.

Then, this invention makes it a subject to provide the working machine provided with the tank apparatus which can reduce the stress which generate | occur | produces when bolting the board material for tank fixation in view of the said problem.
In addition, when a control valve is arranged in front of the hydraulic oil tank in the work machine and the liquid level inspection window and the battery vent of the hydraulic oil tank are formed with one opening, the hydraulic oil flows in from the liquid level inspection window. It is conceivable that hot air around the control valve flows to the battery side together with the outside air, resulting in insufficient cooling of the battery.
Therefore, in view of the above problems, the present invention can prevent the hot air around the control valve from flowing to the battery side together with the outside air flowing in from the liquid level inspection window, and the battery is not cooled sufficiently. It is an object to provide a work machine.

  A work machine according to an aspect of the present invention is a side view of a tank lower portion in which a load is mounted on an upper surface, and a tank upper portion that is provided so as to protrude upward from the tank lower portion and is aligned with the load in a horizontal direction. A hydraulic oil tank formed in an L shape, a control valve disposed on the side of the hydraulic oil tank, a battery mounted on the upper surface of the lower tank, and the control valve more than the battery on the upper surface of the lower tank A liquid level gauge of the tank disposed on the side close to the tank, and a cover member that covers the hydraulic oil tank, the battery, and the liquid level gauge, wherein the liquid level in the cover member Between an opening formed from a region facing the meter to a region facing the battery, and a space where the battery is disposed and a space where the liquid level meter is disposed. That and a partition wall.

  According to the above configuration, it is difficult for hot air around the control valve to flow to the battery arrangement side, while the opening serves as an opening that serves both as the liquid level inspection window and the battery vent.

It is a side view of a backhoe. It is a top view of a turntable. It is a right view of a turntable. It is a top view of a body frame. It is a front view of a hydraulic oil tank arrangement part. It is a perspective view of a hydraulic oil tank and a battery. (A) is a plane sectional view of a hydraulic oil tank, (b) is a side sectional view of a hydraulic oil tank. It is a side view of the upper part of a hydraulic oil tank. It is a perspective view of a tank mounting base. It is front sectional drawing of a tank mounting base and a hydraulic-oil tank bottom part. It is the figure which looked at the hydraulic oil tank from the bottom. It is a schematic block diagram of an operation pattern switching valve, a control valve, and a control device. (A) is a front view of the state which assembled | attached the control valve and the operation pattern switching valve to the hydraulic oil tank, (b) is a perspective view of a mounting bracket. It is a perspective view of the hydraulic oil tank lower part which shows the welding structure of the conventional plate material for tank fixing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a backhoe 1 exemplified as a work machine.
The backhoe 1 includes a lower traveling device 2 and an upper rotating body 3.
The traveling device 2 has a pair of left and right crawler-type traveling devices 20 that travels in an endless belt-shaped rubber crawler 15 that circulates in a circumferential direction with drive wheels 40 driven by a hydraulic motor. A front end of the traveling device 2 is equipped with a dozer device 23 driven by a hydraulic cylinder.

The swivel body 3 includes a swivel base 4 (machine body) mounted on the traveling device 2 so as to be pivotable about a swivel axis in the vertical direction, and a work device 5 (excavation work device) provided at a front portion of the swivel base 4. ). The swivel 4 is swiveled around a swivel axis by a swivel motor M formed of a hydraulic motor.
As shown in FIG. 2, the swivel 4 includes a driver's seat D, an engine E, first and second hydraulic pumps P1 and P2, a radiator R, an oil cooler O, a hydraulic oil tank T, a battery B, a control valve V1, An operation pattern switching valve V2 and the like are provided.

  The driver's seat D is disposed at the rear of the swivel 4 and to the left from the center in the left-right direction. Control tables 12L and 12R are provided on the left and right sides of the driver's seat D, and control devices 14L and 14R having control levers 13L and 13R are provided on the control tables 12L and 12R, respectively. The left and right control devices 14L and 14R include pilot valves PVL and PVR operated by the control levers 13L and 13R, and the control levers 13L and 13R can be tilted back and forth and left and right.

The engine E is horizontally disposed in the left-right direction and mounted on the rear part of the swivel base 4.
The first hydraulic pump P1 and the second hydraulic pump P2 are attached to the left side of the engine E and are driven by the engine E.
The first hydraulic pump P1 is a split flow type hydraulic pump having a function of a constant flow double pump that discharges an equal amount of hydraulic fluid from two independent discharge ports. The first hydraulic pump P1 is used for supplying hydraulic oil that operates various hydraulic actuators installed in the backhoe 1.

The second hydraulic pump P2 is a constant displacement gear pump, and is used for supplying a signal pressure such as a pilot pressure or a detection signal.
The radiator R is disposed on the right side of the engine E, and the oil cooler O is disposed on the right side of the radiator R. A cooling fan F that is rotationally driven by the engine E is provided on the right side of the engine E. The cooling fan F is a suction type fan, and allows cooling air to flow from the right side to the left side of the radiator R and the oil cooler O.

The hydraulic oil tank T and the battery B are disposed in front of the radiator R and the oil cooler O, and the control valve V1 and the operation pattern switching valve V2 are disposed in front of the hydraulic oil tank T and the battery B.
The control valve V1 is formed by sequentially arranging control valves for controlling the hydraulic actuators mounted on the backhoe 1 in the vertical direction and interconnecting them.

As shown in FIG. 2, the engine E, the first and second hydraulic pumps P1 and P2, the radiator R, the oil cooler O, the hydraulic oil tank T, the battery B, the control valve V1, and the operation pattern switching valve V2 are the cover device 17. Covered by.
The cover device 17 is roughly divided into an engine cover body 18 that covers the engine E and the first and second hydraulic pumps P1 and P2, a radiator R, an oil cooler O, a hydraulic oil tank T, a battery B, a control valve V1, and the like. The side cover body 19 covers the operation pattern switching valve V2.

  As shown in FIG. 3, the side cover body 19 has a radiator R, an oil cooler O, a hydraulic oil tank T, a battery B, a control valve V1, and an operation pattern switching valve V2. An outer cover 19A for covering and an upper cover covering the front of the control valve V1 and the operation pattern switching valve V2 and covering the radiator R, the oil cooler O, the hydraulic oil tank T, the battery B, the control valve V1 and the operation pattern switching valve V2. 19B.

At the rear of the outer cover 19A, there are provided intake openings 61A and 61B fitted with a porous member having a large number of ventilation holes. The cooling fan F causes the radiator R to pass through the intake openings 61A and 61B. The outside air can be sucked into the arrangement space of the oil cooler O and the engine E.
The upper cover 19B is openable and closable.

  As shown in FIG. 1, the working device 5 is supported by a support bracket 6 provided at the front portion of the swivel 4 so that it can swing left and right around a vertical axis and is driven by a hydraulic cylinder. A bracket 7, a boom 8 connected to the upper part of the swing bracket 7 so as to be swingable up and down and driven by a boom cylinder C1 made of a hydraulic cylinder, and connected to a tip side of the boom 8 so as to be swingable back and forth. The arm 9 is driven by an arm cylinder C2 made of a hydraulic cylinder, and the bucket 10 is connected to the front end side of the arm 9 so as to be able to swing back and forth and is driven by a bucket cylinder C3 made of a hydraulic cylinder. The bucket 10 is provided with a hanging metal fitting 11 so that crane work is possible.

As shown in FIG. 4, the swivel 4 has a body frame 21 that is a skeleton configured by combining plate materials and the like. A weight 22 (see FIG. 1) constituting the rear part of the swivel base 4 is attached to the rear part of the machine body frame 21, and the swirl constituting the exterior of the swivel base 4 is provided on the left and right sides and the front side of the body frame 21. A cover is attached.
The body frame 21 includes a frame substrate 24 made of a thick plate material that forms the bottom of the swivel base 4, and a pair of left and right reinforcing vertical ribs 25 </ b> L and 25 </ b> R that are welded and fixed onto the frame substrate 24.

The left and right vertical ribs 25 </ b> L and 25 </ b> R are made of a plate material, are arranged vertically so as to face each other in the left-right direction, and are provided from the front to the rear of the frame substrate 24. A pair of upper and lower support brackets 6 are fixed to the front portions of the left and right vertical ribs 25L and 25R by welding.
The fuselage frame 21 has a partition wall 41 arranged vertically so that the plate surface faces front and rear, closer to the rear than the central portion of the frame substrate 24 in the front-rear direction, and the partition wall 41 includes left and right vertical ribs 25L. 25R across the left and right direction of the frame substrate 24. The engine E is mounted on the body frame 21 on the rear side of the partition wall 41.

As shown in FIGS. 5 and 6, the hydraulic oil tank T is formed in an L shape from a tank lower part 62 and a tank upper part 63 provided so as to project upward from the tank lower part 62.
In this embodiment, the front-rear width of the tank upper part 63 is formed to be the same width as the front-rear width of the tank lower part 62, and the tank upper part 63 protrudes upward from the left side of the upper end of the tank lower part 62. Has been.

  A bracket mounting member 64 is fixed to the front surface 63 a upper part of the tank upper part 63, the front surface 62 a lower part of the tank lower part 62, and the front end side of the upper surface 62 b of the tank lower part 62, and the control valve bracket 65 is attached to the bracket mounting member 64. . The control valve bracket 65 is made of a plate material, and is arranged and attached so that the plate surface faces front and rear, and the control valve V1 is attached to the front surface of the control valve bracket 65.

A switching valve bracket 66 is fixed to the upper portion of the corner portion between the front surface 63a and the left side surface 63b of the tank upper portion 63. An operation pattern switching valve V2 is attached and fixed to the switching valve bracket 66.
The tank upper portion 63 overhangs from the upper portion of the tank upper body 67 to the upper side of the upper surface of the tank lower portion 62 (from the right side of the upper end portion of the tank upper portion 63). And an overhang portion 68 (extending to the right).

The upper wall of the overhang portion 68 is integrally extended from the upper wall of the tank upper body 67, and the upper surface 68 a of the overhang portion 68 is flush with the upper surface 67 a of the tank upper body 67. Accordingly, the upper surface 68a of the overhang portion 68 and the upper surface 67a of the tank upper body 67 constitute an upper surface 63c of the tank upper portion 63 (hydraulic oil tank T).
Further, the lower surface 68b of the overhang portion 68 is formed in an inclined shape that is inclined upward from the upper portion of the right side surface 63c of the tank upper portion 63 toward the overhang direction (an inclined surface that is inclined obliquely upward to the right). Formed).

Note that the front surface of the overhang portion 68 is flush with the front surface of the tank upper portion 63, and the rear surface of the overhang portion 68 is flush with the front surface of the tank upper portion 63.
As shown in FIG. 7, a filter insertion hole 69 is formed in the upper surface 63c of the tank upper portion 63 (on the wall portion constituting the upper surface of the hydraulic oil tank T). The return filter 70 and the suction filter 71 are inserted into the hydraulic oil tank T through the filter insertion hole 69.

A cover mounting seat is fixed around the filter insertion hole 69 on the upper surface of the tank upper portion 63, and a tank cover 73 for closing the filter insertion hole 69 is attached to the cover mounting seat 72.
In the backhoe of the present embodiment, the left and right width of the hydraulic oil tank T cannot be taken sufficiently due to restrictions on the installation location, and the left and right width of the tank upper portion 63 is narrow, but the tank upper portion 63 has an overhang portion 68. As a result, the left and right width of the upper end side of the tank upper portion 63 can be widened, the hole diameter of the filter insertion hole 69 can be secured, and the mounting area for mounting the tank cover 73 can be secured.

  As shown in FIG. 7, the tank cover 73 has an upper portion of a return filter mounting pipe 74 passing therethrough and an upper portion of the return filter mounting pipe 74 fixed thereto. A first return hose connection pipe 75 is connected and fixed to the upper end of the return filter mounting pipe 74, and the first return hose connection pipe 75 returns the hydraulic oil returned to the control valve V 1 to the hydraulic oil tank T. The hose is connected. A second return hose connection pipe 76 is connected and fixed to the first return hose connection pipe 75, and the return hydraulic oil from the oil cooler O is returned to the hydraulic oil tank T in the second return hose connection pipe 76. A return hose is connected. A return filter 70 is mounted vertically on the lower end side of the return filter mounting pipe 74. The return filter 70 is located at the left front part inside the tank lower part 62.

  A suction filter mounting pipe 77 penetrates and is fixed to the lower side of the rear wall 62c of the tank lower part 62 by welding and the suction filter mounting pipe 77 is welded. A suction filter 71 is attached to the front end of the suction filter attachment pipe 77. The suction filter 71 is inserted into the hydraulic oil tank T through the filter insertion hole 69, and is attached by screwing a nut 71 a fixed to the suction filter 71 into a taper threaded portion 77 a of the suction filter attachment pipe 77.

A suction hose connection pipe 78 is connected and fixed to the rear end of the suction filter attachment pipe 77. The suction hose connection pipe 78 is connected to a suction hose for flowing hydraulic oil from the hydraulic oil tank T to the first and second hydraulic pumps.
The suction filter mounting pipe 77 is disposed and fixed in an inclined manner toward the rear diagonally left side. Thus, the suction filter 71 is inclined so as to move rightward as it goes forward so that the front end side of the suction filter 71 is located on the right side of the lower portion of the return filter 70.

Further, an unload valve V3 and a second speed switching valve V4 are disposed and attached to the rear right side of the tank lower part 62 (the rear end right side of the suction filter attachment pipe 77).
The unloading valve V3 disables the operation of the work device 5 and the swivel 4 and pulls up a lever provided on the side of the driver's seat D when getting off to operate the work device 5 and the swivel 4. It is comprised so that operation of this becomes impossible.

The traveling second speed switching valve V4 is a switching valve that switches the traveling motor that drives the crawler traveling device 20 to a first speed state or a second speed state.
If the return filter 70 is disposed above the liquid level 79 of the hydraulic oil, there is a problem that bubbles are formed in the hydraulic oil, and the swivel base 4 (airframe) swings back and forth and right and left or up and down and right and left. In addition, since there is work on an inclined ground, the return filter 70 must be sufficiently lower than the liquid level 79 of the hydraulic oil. When the return filter 70 is sufficiently lowered from the liquid level 79, the lower part of the return filter 70 is positioned at the height at which the suction filter 71 is disposed in a small hydraulic oil tank T having a low hydraulic oil level 79. On the other hand, on the right side of the rear end of the suction filter mounting pipe 77, an unload valve V3 and a second speed switching valve V4 are arranged for the convenience of maintenance and hydraulic hose handling. Therefore, it is difficult to arrange the suction filter 71 so as to be close to the right side wall of the hydraulic oil tank T. Further, it is desirable to keep the return filter 70 and the suction filter 71 as close as possible so that the return hydraulic oil is not sucked in immediately.

Therefore, in the present embodiment, the return filter mounting pipe 74 is disposed obliquely and fixed to the hydraulic oil tank T, so that interference between the return filter 70 and the suction filter 71 is avoided and the return filter 70 and the suction filter 71 are They are separated.
As shown in FIGS. 5 and 6, a battery B as a load is mounted on the upper surface of the tank lower part 62, and the height of the hydraulic oil level 79 is displayed in front of the battery B. An oil gauge device 80 is disposed.

  The battery B is attached to a battery attachment member 81 that is attached and fixed to the upper surface of the tank lower part 62. The battery attachment member 81 has a bottom wall 81a, a left side wall 81b, and a front wall 81c. The bottom wall 81 a of the battery mounting member 81 is bolted to a fixing member fixed to the upper surface of the tank lower part 62. The battery B is placed on the bottom wall 81 a of the battery mounting member 81 and is pressed and fixed to the bottom wall 81 a by the mounting bracket 82.

  The mounting bracket 82 presses and fixes the battery B against the bottom wall 81a of the battery mounting member 81 by tightening the left and right nut members 83a and 83b, but the lower surface 68b of the overhang portion 68 of the tank upper portion 63 is overhanging. By being inclined so as to incline upward in the direction, the space on the lower surface side of the overhang portion 68 becomes wider in the overhang direction, and the tightening operation of the nut member 83a on the back side (left side) is performed. (It is easy to install the battery B mounted on the tank upper part 63).

The oil gauge device 80 includes an oil gauge 84 and a communication pipe 85, and is positioned in front of the front wall 81c of the battery mounting member 81 (the tank lower part 62 in the horizontal direction perpendicular to the overhang direction of the overhang portion 68). It is positioned so as to be juxtaposed with the upper battery B).
The oil gauge 84 includes a support member 86, a gauge pipe 87, and upper and lower joints 88 and 89.

  The support member 86 is formed long in the vertical direction, and is erected on the front end side and the right end side of the upper surface 63 b of the tank upper part 63. The gauge tube 87 is formed of a transparent pipe, and is arranged vertically in front of the support member 86. The upper joint 88 connects the upper end of the gauge tube 87 to the upper end side of the support member 86, and the lower joint 89 connects the lower end of the gauge tube 87 to the lower end side of the support member 86.

The lower end of the gauge pipe 87 communicates with the inside of the tank lower part 62 through a passage formed in the lower part of the lower joint 89 and the support member 86.
The communication pipe 85 is disposed in the left-right direction from the upper end of the support member 86 to the right side surface 63c of the tank upper part 63, the left end of the communication pipe 85 communicates with the inside of the tank upper part 63, and the right end of the communication pipe 85 is It communicates with the upper end of the gauge tube 87 through a passage formed in the support member 86 and the upper joint 88.

In the oil gauge device 80 configured as described above, the height of the hydraulic oil level 79 is displayed on the gauge pipe 87.
In the case where the hydraulic oil tank T is formed in an L shape (with a stepped shape) and the battery B is mounted on the upper surface of the tank lower portion 62, when the oil gauge 84 is installed on the right side surface 63c of the tank upper portion 63, It is difficult to visually recognize the oil gauge 84 from the outside (right side) of the machine body 4, and if the oil gauge 84 is installed on the right side surface 62 d of the tank lower part 62, the capacity of the hydraulic oil tank T cannot be secured.

  On the other hand, in the oil gauge device 80 having the configuration of the present embodiment, the oil gauge 84 whose upper part communicates with the inside of the tank upper part 63 via the communication pipe 85 and whose lower part communicates with the inside of the tank lower part 62. Are arranged in parallel with the battery B in the front-rear direction, while the capacity of the hydraulic oil in the hydraulic oil tank T is secured to the outside of the body 4 (the tank upper part 63 while securing the capacity of the hydraulic oil. Can be easily seen from the battery B mounting side).

As shown in FIG. 3, the side cover body 19 also serves as a liquid level inspection window 91 for inspecting the hydraulic oil level 79 and a battery vent 92 for taking outside air into the battery arrangement space. Opening 93 is formed.
As shown in FIG. 8, the opening 93 is formed so as to cover the battery B and the gauge tube 87 when viewed from the right side. Further, as shown in FIGS. 5 and 8, the opening 93 is partitioned into a liquid level inspection window 91 and a battery vent 92 by a front wall 81c of the battery mounting member 81 (battery mounting). The front wall 81c of the member 81 is a partition wall that partitions the liquid level inspection window 91 and the battery vent 92).

In this manner, the liquid level inspection window 91 and the battery vent 92 are formed by the single opening 93, so that the cost can be reduced.
In the present embodiment, the outside air is taken into the battery arrangement space via the battery vent 92 by the suction force of the cooling fan F, and the battery B is cooled by the taken outside air. .

When the liquid level inspection window 91 and the battery vent 92 are formed by a single opening 93, the hot air around the control valve V1 disposed in front of the hydraulic oil tank T together with the outside air flowing in from the liquid level inspection window 91 is obtained. It is considered that the battery B is caused to flow and the cooling of the battery B becomes insufficient.
However, in the present embodiment, the liquid level inspection window 91 and the battery vent 92 are partitioned by the front wall 81 c of the battery mounting member 81, and the opening 93 is separated from the liquid level inspection window 91 and the battery vent 92. However, the structure is such that the hot air around the control valve V1 does not easily flow toward the battery B arrangement side.

As shown in FIG. 5, the hydraulic oil tank T is fixedly attached to a tank mounting base 94 provided on the body frame 21 by bolts 95.
As shown in FIGS. 9 and 10, the tank mounting base 94 includes a support leg 96 that is erected and fixed to the frame substrate 24, and a mounting fixing plate 97 for mounting and fixing the hydraulic oil tank T.
The support leg 96 is formed by bending a plate material, and is formed in an L shape in plan view from a front wall 96a and a side wall 96b extending rearward from the right end of the front wall 96a. The lower end of the support leg 96 is fixed to the frame substrate 24 by welding. The rear end of the side wall 96b of the support leg 96 is in contact with the front surface of the right wall 98 of the partition wall 41 and is fixed to the right wall 98 by welding.

The right side wall 98 of the partition wall 41 is formed one step lower and is formed at the same height as the support legs 96. The right wall 98 of the partition wall 41 protrudes rightward from the rear end of the side wall 96b of the support leg 96.
A reinforcing plate 99 is welded and fixed to the front portion of the laterally outer side surface (right side surface) of the side wall 96b of the support leg 96. The reinforcing plate 99 is formed at the same height as the support legs 96.

The mounting fixing plate 97 is disposed such that the plate surface faces up and down, and is mounted on the support leg 96, the right side wall portion 98 of the partition wall 41, and the reinforcing plate 99. The lower surface of the mounting fixing plate 97 is welded and fixed to the support legs 96, the right wall portion 98 of the partition wall, and the reinforcing plate 99 from below.
A plurality of screw holes 100 are formed through the edge portions on the left and right edge sides of the mounting fixing plate 97 (in this embodiment, three screw holes 100 are formed in the front-rear direction. )

  As shown in FIG. 11, the bottom surface 101 of the hydraulic oil tank T has a pair of outer edges 101a and 101b (front and rear outer edges facing each other in the front-rear direction) and a pair of outer edges 101c and 101d (left and right) extending in the front-rear direction. Left and right outer edges facing each other in the direction). On the bottom surface 101 of the hydraulic oil tank T, tank fixing plate materials 102 are welded and fixed to the left and right of the bottom surface 101 (the tank fixing plate materials 102 are provided corresponding to a pair of opposing outer edges 101c and 101d. ing).

Each of the left and right tank fixing plate members 102 is formed to have a length extending in the front-rear direction of the bottom surface 101 of the hydraulic oil tank T. Each of the left and right tank fixing plate materials 102 is overlapped with the bottom surface 101 of the hydraulic oil tank T and welded and fixed to the bottom surface 101, and bolts protruding from the left and right outer edges 101c and 101d of the bottom surface 101 of the tank. And a fixing portion 104.
The bolt fixing portion 104 is formed with a plurality of bolt holes 105 through which the tank fixing bolts 97 are inserted in the front-rear direction (in this embodiment, three bolt holes 105 are formed in the front-rear direction).

Further, the bolt hole forming portion 104a in which the bolt hole 105 of the bolt fixing portion 104 is formed protrudes outward from the edge portion 104b between the bolt hole forming portions 104a.
As shown in FIG. 10, the hydraulic oil tank T is mounted on a mounting fixing plate 97 of a tank mounting base 94 and has three bolt holes 105 formed in each of the left and right tank fixing plates 102. These are fixedly attached by means of bolts 95 that are aligned with the three screw holes 100 on the same side in the left-right direction and are inserted into the screw holes 100 through the bolt holes 105 from above.

As shown in FIG. 11, the edge portion 103a facing in the left-right direction of the overlapping portion 103 of each of the left and right tank fixing plate materials 102 intermittently connects the long weld bead 109 along the edge portion 103a. Thus, the oil is welded to the bottom surface 101 of the hydraulic oil tank T.
Further, a welding opening hole 106 is formed in the overlapping portion 103 of each of the left and right tank fixing plate materials 102. The welding hole 106 is formed at a position away from the left and right outer edges 101 c and 101 d of the bottom surface 101 of the hydraulic oil tank T toward the center in the left-right direction of the hydraulic oil tank T. The opening edge 107 of the welding opening hole 106 and the bottom surface 101 of the tank are welded.

As a result, the distance between the bolt hole 105 and the welded portion closer to the bolt hole 105 does not depend on the mounting space of the hydraulic oil tank T, so that the welded portion can be moved away from the bolt hole 105 and used for tank fixing. The stress generated when the plate member 102 is bolted can be reduced.
Further, when a welding opening hole 106 is formed in the tank fixing plate material 102 and the opening edge 107 of the welding opening hole 106 and the bottom surface 101 of the hydraulic oil tank T are welded, the welding distortion is caused by the tank fixing plate material 102. The bolt fixing portion 104 is pressed down (see arrow G in FIG. 10).

  On the other hand, since the lower surface of the mounting fixing plate 97 of the tank mounting base 94 is welded to the support leg 96, the welding distortion is caused to push down the formation portion of the screw hole 100 of the mounting fixing plate 97 (the arrow in FIG. 10). K reference). Therefore, by welding the opening edge portion 107 of the welding opening hole 106 formed on the tank fixing plate material 102 and the bottom surface 101 of the hydraulic oil tank T, the bolt fixing portion 104 of the tank fixing plate material 102, the tank mounting base, and the like. The direction (G, K) of welding distortion generated in the formation portion of the screw hole 100 of the 94 mounting fixing plate 97 can be matched, and is generated when the tank fixing plate 102 is bolted to the mounting fixing plate 97. Stress can be reduced.

  Further, the distance between the weld bead 110 formed in the welding opening hole 106 of the left and right tank fixing plate member 102 and the welding bead 110 formed in the welding opening hole 106 of the other left and right tank fixing plate member 102 ( The larger one is more advantageous for the moment to tilt the hydraulic oil tank T left and right. Therefore, in this embodiment, the opening edge portion 107 of each welding opening hole 106 is welded to the bottom surface 101 of the tank on the side far from the horizontal center S of the bottom surface 101 of the tank. As a result, it is possible to provide a structure that is advantageous with respect to the moment load that attempts to collapse the hydraulic oil tank T.

  In the present embodiment, a pair of front and rear openings 106 for welding are formed on each tank fixing plate 102 (a pair is formed in the direction along the left and right outer edges 101c and 101d). Each welding opening hole 106 is formed long along the direction from one adjacent bolt hole 105 to the other bolt hole 105. Further, the pair of welding opening holes 106 formed in each tank fixing plate 102 is formed in a horizontal line X passing through the center of the central bolt hole 105a among the three bolt holes 105 formed in the horizontal direction. On the other hand, it is formed in a distributed form.

Of the welding opening holes 106 of the left tank fixing plate 102, the front welding opening hole 106 also serves as an insertion hole through which the drain pipe 108 fixed to the bottom surface 101 of the hydraulic oil tank T is inserted.
A weld bead 110 formed on the opening edge 107 of each welding opening hole 106 is formed long along the opening edge 107, and a pair of welding beads 110 are formed corresponding to each bolt hole 105. Has been. In addition, each weld bead 110 is formed such that the center side in the longitudinal direction is close to the corresponding bolt hole 105 and the end in the longitudinal direction is far from the corresponding bolt hole 105.

  As a result, the force applied to the welded portion from the bolt 95 that fixes the tank fixing plate 102 is received at the center side of the long weld bead 110, and the load from the bolt 95 is applied to the end portion side of the weld bead 110 where stress is concentrated. It can be made less expensive. Moreover, since the weld bead 110 is formed corresponding to each bolt hole 105, cost and welding distortion can be suppressed.

  In addition, a relatively large radius (for example, a radius having a radius of ½ or more of the left and right width of the welding opening hole 106) is attached to the corner 106a opposite to the central bolt hole 105a of each welding opening hole 106. ing. Further, the corner 106b of each welding opening hole 106 facing the front bolt hole 105b and the rear bolt hole 105c is inclined. By these, the welding part is kept away from the bolt hole 105.

As shown in FIG. 12, the operation pattern switching valve V2 is connected to the pilot valves PVL and PVR of the left and right control devices 14L and 14R via four hydraulic hoses 111, respectively. The switching valve V2 is connected to the four control valves V11 to 14 of the control valve V1 via two hydraulic hoses 111, respectively.
One of the four control valves V11 to 14 is operated by tilting the front and rear of one of the left and right control levers 13L and 13R, and the remaining three control valves are operated by tilting the left and right of the one control lever 13L and 13R. One of V11-14 is operated, and one of the remaining two control valves V11-14 is operated by tilting the front and rear of the other left and right control levers 13L, 13R, and the other control levers 13L, 13R are operated. The remaining one control valve V11-14 is operated by the left / right tilting operation.

The four control valves V11 to 14 are a swing control valve that controls the swing motor M, a boom control valve that controls the boom cylinder C1, an arm control valve that controls the arm cylinder C2, and a bucket that controls the bucket cylinder C3. It is a control valve.
The operation pattern switching valve V2 switches operation patterns of the control devices 14L and 14R for the four control valves V11 to 14. As an operation pattern of the control devices 14L and 14R switched by the operation pattern switching valve V2, for example, one operation pattern is that the swivel is driven by the left and right tilt operation of the left control lever 13L, and the front and rear of the left control lever 13L The arm is driven by the tilting operation, the bucket is driven by the right and left tilting operation of the right steering lever 13R, and the boom is driven by the front and rear tilting operation of the right steering lever 13R. The other operation pattern is the left steering lever 13L. The left and right tilting operation drives the arm, the left steering lever 13L tilts back and forth, and the swivel turns, and the right steering lever 13R has the same operation pattern.

One end of the hydraulic hose 111 is connected to an operation pattern switching valve V2 via an elbow joint 112. The other end of the hydraulic hose 111 is connected via a straight joint 113 to pilot valves PVL and PVR of the control devices 14L and 14R and control valves V11 to 14 of the control valve V1.
When one end of the hydraulic hose 111 is connected to the hydraulic equipment via the elbow joint 112 and the other end of the hydraulic hose 111 is connected to the hydraulic equipment via the straight joint 113, the straight joint 113 side of the hydraulic hose 111 is first connected. When the elbow joint 112 side is connected later, the hydraulic hose 111 may be twisted. Therefore, it is necessary to connect the elbow joint 112 side first.

In this embodiment, since the elbow joint 112 side of all hydraulic hoses 111 is connected to the operation pattern switching valve V2, all hydraulic hoses 111 connected to the operation pattern switching valve V2 are switched to the operation pattern. The valve V2 can be sub-assembled, and assembly in the manufacturing process can be simplified.
FIG. 13 shows a modified example of the assembly of the control valve V1 and the operation pattern switching valve V2.

In FIG. 13, one mounting bracket 114 is provided with a first mounting portion 114a to which the operation pattern switching valve V2 is mounted and a second mounting portion 114b to which the control valve V1 is mounted. It is attached to the hydraulic oil tank T (or other parts may be used).
As a result, the operation bracket switching valve V2 and the control valve V1 are attached to the mounting bracket 114, and the operation bracket switching valve V2 and the control valve of the control valve V1 are connected by the hydraulic hose 111 and subassembled. Can be attached to the hydraulic oil tank T, and the assembly can be facilitated.

  Further, since the operation pattern switching valve V2 and the control valve V1 are attached to the hydraulic oil tank T (the same parts), the operation pattern switching valve V2 and the control valve V1 are connected in the subassembly process of the hydraulic oil tank T. Since the hydraulic hose 111 can be assembled, the assembly process of the hydraulic hose 111 on the production main line can be reduced, and the number of steps on the production main line can be reduced.

DESCRIPTION OF SYMBOLS 1 Working machine 5 Working device 13L, 13R Operation member 19 Cover member (side cover body)
62 Lower tank 63 Upper tank 80 Level gauge (oil gauge device)
81c Partition wall (front wall)
93 opening 111 first hydraulic hose, second hydraulic hose (hydraulic hose)
112 Elbow joint 114 Mounting member (Mounting bracket)
B battery (equipped)
F Fan (Cooling fan)
T tank (hydraulic oil tank)
V1 control valve V2 operation pattern switching valve

Claims (7)

A hydraulic oil tank formed in an L-shape in a side view by a tank lower portion on which the load is mounted on the upper surface, and a tank upper portion provided in an upward projecting manner from the lower portion of the tank and arranged in a horizontal direction with the load;
A control valve located on the side of the hydraulic oil tank;
A battery mounted on the upper surface of the lower part of the tank;
A liquid level gauge of the tank disposed on the side closer to the control valve than the battery on the upper surface of the tank lower part;
A working machine comprising a cover member that covers the hydraulic oil tank, the battery, and the liquid level gauge,
An opening formed from a region facing the liquid level gauge in the cover member to a region facing the battery;
A working machine comprising a partition wall that partitions a space in which the battery is disposed and a space in which the liquid level gauge is disposed.   The said partition wall is extended from the area | region between the said battery and the said liquid level gauge to the said opening part, The said opening part is partitioned off into the said liquid level gauge side and the said battery side. Working machine.   The working machine according to claim 1, further comprising a fan that sucks outside air into the cover member through the opening.   The work machine according to claim 1, wherein the control valve is attached to a side surface of the tank. A working device driven by hydraulic oil contained in the tank;
An operation member for an operator to operate the working device,
The work machine according to any one of claims 1 to 4, wherein the control valve switches a supply / discharge state of hydraulic oil to the work device in accordance with an operation of an operator on the operation member. An operation pattern switching valve for switching the correspondence between the operation content of the operator and the operation of the control valve with respect to the operation member;
The work machine according to claim 5, wherein the control valve and the operation pattern switching valve are attached to the tank using a common attachment member. A first hydraulic hose connecting the operation member and the operation pattern switching valve;
A second hydraulic hose connecting the operation pattern switching valve and the control valve;
The work machine according to claim 6, wherein a joint on the side connected to the operation pattern switching valve in the first hydraulic hose and the second hydraulic hose is an elbow joint.

Images