JP6847911B2 - Work machine - Google Patents

Description

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

Conventionally, a working machine (backhoe) disclosed in Patent Document 1 is known.
The working machine disclosed in Patent Document 1 is a work machine (swivel stand), a fuel tank provided on one side in the width direction of the machine body, a control valve provided above the fuel tank, and fuel in the fuel tank. It is equipped with a refueling pump for supplying and a control box containing a control mechanism for controlling the refueling pump. The control box is located in front of the control valve. The control mechanism includes a refueling switch and the like for switching the operation and stop of the refueling pump.

Japanese Unexamined Patent Publication No. 2007-224568

In the above work machine, the control valve is a combination of a plurality of valves, but the number of valves that make up the control valve may increase due to changes in the specifications of the work machine, and the number of valves increases. As the number increases, the control valve becomes larger.
However, in the above-mentioned working machine, when the control box includes a control device (relay or the like) other than the refueling switch, a relatively large space for arranging the control box is required in front of the control valve. Therefore, it has been difficult to cope with the increase in size of the control valve.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is possible to cope with an increase in the size of the control valve by devising the arrangement of the control device for controlling the refueling pump. The purpose is to provide a working machine.

The working machine according to one aspect of the present invention includes a hydraulic oil tank, a hydraulic device operated by the hydraulic oil, a control valve for controlling the operation of the hydraulic device, and a return oil through which the hydraulic oil returned from the hydraulic device flows. The inlet port to which the path is connected, the first outlet port to which the first pipe material forming the first oil passage connected to the control valve is connected, and the second pipe material forming the second oil passage connected to the hydraulic oil tank. The first pipe material includes a second outlet port to which the return oil passage is connected, and a switching valve having an operation handle for switching the connection destination of the return oil passage to either the first oil passage or the second oil passage. Has a first connecting member connected to the first outlet port, a connecting pipe connected to the inlet port of the control valve, and a pipe joint connecting the first connecting member and the connecting pipe. The first connecting member, the connecting pipe, and the pipe joint are made of a rigid material, and the switching valve is supported above the control valve by the first pipe material. The rotation direction of the screw of the joint and the rotation direction of the operation handle are the same, and the O-ring is built in the pipe joint of the first pipe material.

According to the above working machine, the refueling switch is provided above the fuel tank and at the first position in the horizontal direction with respect to the first control valve, and the control device of the refueling pump different from the refueling switch is different from the upper part of the fuel tank. Since it is provided at the second position, a relatively wide space can be secured above the fuel tank. Therefore, the first control valve provided above the fuel tank can be extended in the horizontal direction, and the size of the first control valve can be increased due to a change in the specifications of the working machine or the like.

It is a perspective view which looked at the aircraft from the right front. It is a perspective view which shows the inside of the center frame which looked at the aircraft from the right front. It is a perspective view of the inside of an airframe. It is a top view of the inside of the aircraft. It is a perspective view of the inside of the left side of the fuselage. It is a perspective view of the 1st control valve. It is a perspective view which looked at the periphery of the front part of the 1st control valve from the rear. It is a top view of the switching valve. It is a front side view which shows the relationship between a switching valve and a 1st control valve. It is a perspective view which looked at the periphery of the front part of the 1st control valve from the front. It is an enlarged view of FIG. It is a perspective view which looked at the periphery of the 2nd bracket from the left rear. It is a perspective view of the hydraulic oil tank. It is a top view of the hydraulic oil tank. It is a perspective view of the state where the 2nd control valve is attached to a bracket. It is a perspective view which looked at the bottom of a step from the left. It is a side view which looked at the upper part of a step from the left. It is a top view around the driver's seat. It is a perspective view which shows the relationship between the 1st connector and a hose. It is a perspective view which looked at the support column of a cabin from the front. It is a perspective view which looked at the cabin from the bottom. It is a perspective view which shows the relationship between a reinforcing member and a support column. It is an enlarged perspective view of the 1st reinforcing material. It is a perspective view which shows the relationship between the 2nd reinforcing material and a support column. It is a figure which shows the state which the 1st reinforcing material was welded to the lower plate and the support column. It is a perspective view which shows the relationship between the 3rd reinforcing material and a support column. It is a perspective view which shows the relationship between a floor mat and a 1st reinforcing material. It is a partially enlarged view of the floor mat. It is the figure which looked at the state which the worker was seated in the driver's seat from the front. It is a perspective view which looked at the step which provided the relay plate from the bottom. It is a perspective view which looked at the relay plate from the left. It is a perspective view which looked at the relay plate from the right. It is a perspective view which shows the relationship between a step and a relay plate. It is a rear view which looked at the 1st weight from the rear. It is a perspective view which looked at the 2nd weight from the rear surface side. It is a perspective view which looked at the 2nd weight from the front side. It is a rear view of the state where the 2nd weight is attached to the 1st weight. It is a cross-sectional view of the state which attached the 2nd weight to the 1st weight. It is a top view explaining the arrangement of the equipment on the machine body. It is a side view which shows the whole structure of a working machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 40 is a schematic view showing the overall configuration of the work machine 1 according to the present embodiment. In the present embodiment, a backhoe, which is a swivel work machine, is exemplified as the work machine 1.
The working machine 1 has a machine body (swivel table) 2, a traveling device 3, and a working device 4.
A cabin 5 is mounted on the aircraft 2. As shown in FIG. 39, a driver's seat 6 is provided in the cabin 5. In the present embodiment, the front side (left side of FIG. 40) of the driver seated in the driver's seat 6 of the work machine 1 is the front, the rear side of the driver (right side of FIG. 40) is the rear, and the left side of the driver (FIG. 40). The front side) will be described as the left side, and the driver's right side (the back side in FIG. 40) will be described as the right side. Further, the horizontal direction K2 (see FIG. 39), which is orthogonal to the front-rear direction K1 (see FIG. 40) and parallel to the ground surface, will be described as the body width direction. Further, the direction from the central portion to the right portion or the left portion in the body width direction of the machine body 2 will be described as the outside of the machine body. In other words, the outside of the airframe is a direction away from the center of the airframe 2 in the airframe width direction in the airframe width direction. The direction opposite to the outside of the aircraft will be described as the inside of the aircraft. In other words, the inside of the machine is a direction that is in the width direction of the machine and approaches the center of the width of the body 2 in the body 2. Further, in the present embodiment, the rotation axis in the direction substantially perpendicular to the ground surface is referred to as a vertical axis, and the rotation axis in a direction substantially horizontal to the ground surface is referred to as a horizontal axis.

The traveling device 3 is provided on the left side and the right side of the lower portion of the machine body 2. The traveling device 3 is a crawler type traveling device. A dozer device 7 is attached to the front portion of the traveling device 3. The dozer device 7 can be moved up and down by expanding and contracting the dozer cylinder C1.
The machine body 2 is rotatably supported on the traveling device 3 via a swivel bearing 8 around the vertical axis (swivel axis) O. The machine body 2 is swiveled by a swivel motor MT. The machine body 2 has a substrate (hereinafter, referred to as a swivel substrate) 9 that swivels around the vertical axis O. The swivel board 9 is formed of a steel plate or the like, and is connected to a swivel bearing 8 arranged below the swivel board 9. The swivel bearing 8 supports the swivel substrate 9 so as to be swivel around the vertical axis. A weight (hereinafter referred to as a first weight) 10 for balancing the weight with the working device 4 is attached to the rear portion of the machine body 2.

As shown in FIGS. 39 and 40, the cabin 5 is mounted on the left portion of the airframe 2. The airframe 2 has a support bracket 13 at the front portion on the right side in the center in the width direction of the airframe. A swing bracket 14 is attached to the support bracket 13 so as to swing around the vertical axis. A working device 4 is attached to the swing bracket 14.
As shown in FIG. 40, the working device 4 has a boom 15, an arm 16, and a bucket 17. The base portion (one end side) of the boom 15 is pivotally attached to the swing bracket 14 so as to be rotatable around a horizontal axis, and is supported so as to be swingable up and down. The base portion (one end side) of the arm 16 is pivotally attached to the tip end side (other end side) of the boom 15 so as to be rotatable around a horizontal axis, and is supported so as to be swingable back and forth. The bucket 17 is provided on the tip end side of the arm 16 so that a squeeze dump operation can be performed. The work machine 1 can be equipped with another work tool (hydraulic attachment) that can be driven by flood control in place of or in addition to the bucket 17. Examples of other working tools include a hydraulic breaker, a hydraulic crusher, an angle bloom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.

The swing bracket 14 is made swingable around the vertical axis by the expansion and contraction of the swing cylinder C2 provided in the machine body 2. The boom 15 is swingable around the horizontal axis by expanding and contracting the boom cylinder C3 that connects the boom 15 and the swing bracket 14. The arm 16 is made swingable by the expansion and contraction of the arm cylinder C4 that connects the arm 16 and the boom 15. The bucket 17 can be squeezed and dumped freely by expanding and contracting the bucket cylinder C5 that connects the bucket 17 and the arm 16.

The hydraulic equipment (dozer cylinder C1, swing cylinder C2, boom cylinder C3, arm cylinder C4, bucket cylinder C5) for driving the work device 4 described above is composed of a hydraulic cylinder.
The boom 15 and the dozer device 7 can be changed to different specifications.
For example, the boom 15 can be changed to a two-piece specification. The two-piece specification is a specification in which the boom 15 is composed of two members, a front boom and a rear boom, and can be bent at a connecting portion between the front boom and the rear boom. In the case of the two-piece specification, a boom cylinder (referred to as a second boom cylinder) for bending the boom 15 at the connecting portion is additionally mounted in addition to the boom cylinder C3.

Further, the dozer device 7 can be changed to A / D (angle dozer) specifications. The A / D specification is a specification that enables the angle operation (swing to the left and right) of the dozer device 7. In the case of the A / D specification, an angle cylinder for angle operation is additionally installed in addition to the dozer cylinder C1.
As shown in FIG. 39, an engine room E2 is provided at the rear of the airframe 2. In the engine room E2, an engine E1, a radiator 18, an oil cooler 19, a receiver (receiver) 37, a condenser 38, and a compressor 39 are arranged. The engine E1 is provided in the engine room E2 on the swivel board 9 with the crankshaft facing the body width direction. The radiator 18 is arranged on the right side of the engine E1 (one in the width direction of the machine body). The oil cooler 19, the receiver (receiver) 37, and the condenser 38 are arranged on the right side of the radiator 18. The condenser 38 cools the refrigerant supplied to the air conditioner unit 70, which will be described later. The compressor 39 is located to the left of the radiator 18 (the other in the width direction of the machine body) and above the engine 10. The compressor 39 compresses the refrigerant supplied to the air conditioner unit 70.

A hydraulic pump 21 is arranged on the left side of the engine E1. The hydraulic pump 21 is driven by the engine E1. The hydraulic pump 21 has a first pump (main pump) and a second pump (pilot pump). The first pump is used to drive the above-mentioned hydraulic equipment and hydraulic attachment. The second pump is mainly used to supply the control signal pressure (pilot pressure).

A cooling fan 79 is provided on the right side of the engine E1. The cooling fan 79 is driven by the engine E1. The cooling fan 79 creates an air flow from right to left.
A tank room TR is provided on the right side of the machine body 2 (one side in the body width direction). A hydraulic oil tank 22, a fuel tank 23, and a battery 24 are arranged in the tank room TR. The hydraulic oil tank 22 stores hydraulic oil to be supplied to the hydraulic equipment. The fuel tank 23 is arranged in front of the hydraulic oil tank 22. The fuel tank 23 stores fuel oil to be supplied to the engine E1. The battery 24 is arranged on the right side of the front portion of the hydraulic oil tank 22 and on the right side of the rear portion of the fuel tank 23.

A first control valve 11 is arranged above the fuel tank 23. The first control valve 11 is an arrangement (integration) of a plurality of control valves that control the supply of hydraulic oil to the hydraulic equipment. A plurality of control valves are arranged side by side in the horizontal direction. That is, the first control valve 11 is arranged horizontally.
<Cover>
As shown in FIG. 1, the upper part of the airframe 2 is covered with a cover. The cover includes a first cover 25, a second cover 26, a third cover 27, a fourth cover 28, a fifth cover 29, and a sixth cover 30.

The first cover 25 covers the rear part of the engine room E2 and the upper part of the rear part. The second cover 26 covers the upper part of the right front portion of the engine room E2. Specifically, the second cover 26 is provided in front of the first cover 25 and above the right front portion of the engine E1. The third cover 27 is provided on the right front side of the first cover 26 and covers the upper part of the tank room TR. The fourth cover 28 covers the right side of the tank room TR. The fifth cover 29 is provided between the cabin 5 and the third cover 27, and is a space between the first vertical rib 31 and the second vertical rib 32 (referred to as the vertical rib space S1) (FIG. 2). It covers the upper part of the rear part (see). The sixth cover 30 is provided in front of the fifth cover 29 and covers the upper part of the front portion of the vertical rib space S1. The sixth cover (center cover) 30 is provided on one side (left side) of the fuel tank 23 and is fixed to the center frame 49.

As shown in FIG. 2, the center frame 49 is provided between the cabin 5 and the third cover 27. The upper part of the center frame 49 is covered with the fifth cover 29 and the sixth cover 30. The center frame 49 has a left side frame 49L, a right side frame 49R, and an upper side frame 49U. The left frame 49L has a plate shape, and is provided with one side facing right and the other side facing left. The left frame 49L is fixed to the upper plate 67 on the first vertical rib 31, which will be described later. The right side frame 49R is provided on the right side of the left side frame 49L, and is fixed to a front plate member 68 mounted on the upper plate 67. A third cover 27 is openably and closably attached to the right frame 49R via a hinge (not shown). The upper frame 49U connects the upper part of the right side frame 49R and the upper part of the left side frame 49L.
<Board>
As shown in FIGS. 3 and 39, a first vertical rib 31, a second vertical rib 32, and a partition plate 33 are provided on the swivel substrate 9.

The first vertical rib 31 and the second vertical rib 32 are provided at intervals in the width direction of the machine body. The first vertical rib 31 extends from the front to the rear on the swivel substrate 9 on the right side of the vertical axis O at the center of swivel of the airframe 2. The second vertical rib 32 extends from the front to the rear on the swivel substrate 9 through the vertical axis O at the turning center of the airframe 2 on the left side of the first vertical rib 31.
The front end portion of the first vertical rib 31 and the front end portion of the second vertical rib 32 project forward from the front end portion of the swivel substrate 9. A support bracket 13 is provided between the front end portion of the first vertical rib 31 and the front end portion of the second vertical rib 32. Further, the upper plate 67 is erected over the upper part of the first vertical rib 31 and the upper part of the second vertical rib 32. The front portion of the upper plate 67 is provided so as to straddle the front portion of the first vertical rib 31 and the front portion of the second vertical rib 32. The rear portion of the upper plate 67 extends rearward along the upper portion of the second vertical rib 32.

As shown in FIG. 3, the first vertical rib 31 has a notch 31a. The cutout portion 31a is formed by cutting out the upper portion of the first vertical rib 31 at the rear right side of the upper plate 67. The height of the first vertical rib 31 is lower than that of the second vertical rib 32 at the notch 31a. The left portion of the hydraulic oil tank 22 and the left portion of the fuel tank 23 are arranged above the notch 31a.
The second vertical rib 32 has a notch 32a and an opening 32b. The cutout portion 32a is provided above the vertical axis O at the center of turning of the machine body 2, and is formed by cutting out the lower portion of the second vertical rib 32. The opening 32b is provided behind the notch 32a.

As shown in FIG. 39, the partition plate 33 is provided in front of the engine room E2 and extends in the width direction of the machine body. The rear end portion of the first vertical rib 31 and the rear end portion of the second vertical rib 32 are connected to the partition plate 33.
As shown in FIGS. 4 and 5, the swivel substrate 9 is provided with a plurality of mounting holes 9a for mounting the swivel bearing 8. The swivel bearing 8 is fixed to the lower part of the swivel substrate 9 by a bolt (not shown) inserted through the mounting hole 9a. The plurality of mounting holes 9a are arranged in an annular shape about the vertical axis O of the swivel substrate 9. The broken lines in FIGS. 4 and 5 indicate the positions of the outer circumferences of the swivel bearing 8.
<1st control valve>
As shown in FIG. 6, the first control valve 11 includes a plurality of control valves V1 to V13 for controlling hydraulic oil supplied to a hydraulic device, an inlet block B2 for taking in pressure oil, and a first control valve for discharging pressure oil. The outlet block B1 and the second outlet block B3 are integrated (integrated). The control valves V1 to V13, the inlet block B2, the first outlet block B1, and the second outlet block B3 are arranged side by side in the horizontal direction. The control valves V1 to V13 are arranged in a direction (front-rear direction) orthogonal to the longitudinal direction (spool operation direction). The positions of the spools of the control valves V1 to V13 are switched by receiving the pilot pressure described later on the pressure receiving portion.

In the present embodiment, the control valve V1 is an A / D control valve that controls the angle cylinder. The control valve V2 is a swing control valve that controls the swing cylinder C2. The control valve V3 is a second valve for SP (service port) that controls the hydraulic attachment. The control valve V4 is a swivel control valve that controls the swivel motor MT. The control valve V5 is a boom control valve that controls the boom cylinder C3. The control valve V6 is a bucket control valve that controls the bucket cylinder C5. The control valve V7 is an arm control valve that controls the arm cylinder C4. The control valve V8 is a first valve for SP (service port) that controls the hydraulic attachment. The control valve V9 is a second valve for the dozer that controls the dozer cylinder. The control valve V10 is a traveling right control valve that controls the traveling motor MR of the traveling device 5 on the right side. The control valve V11 is a PPS / PLS control valve for PPS (Pressure of Pump Sensing) signal pressure and PLS (Pressure of Load Sensing) signal pressure. The control valve V12 is a traveling left control valve that controls the traveling motor MR of the traveling device 5 on the left side. The control valve V13 is a first control valve for the dozer that controls the dozer cylinder.

In this embodiment, the first outlet block B1, the A / D control valve V1, the swing control valve V2, the second control valve V3 for SP, the swing control valve V4, the boom control valve V5, and the bucket are used in this order from the front. Control valve V6, arm control valve V7, SP first control valve V8, dozer second control valve V9, running right control valve V10, inlet block B2, PPS / PLS control valve V11, running left control valve V12 , The first control valve V13 for the dozer and the second outlet block B3 are arranged in this order. However, the arrangement order of the valves constituting the first control valve 11 is not limited to the arrangement order of the present embodiment.

The number and types of valves constituting the first control valve 11 can be changed according to the specifications of the working machine 1. The A / D control valve V1 that controls the angle cylinder is a valve used in the case of the A / D specification. In the case of two-piece specifications, a two-piece control valve is used. That is, the number of valves (the number of sections) is determined by the specifications of the working machine. Therefore, depending on the specifications of the working machine, some control valves may not be mounted, and the number of control valves (number of sections) constituting the first control valve 11 may be reduced. Further, depending on the specifications of the working machine, the number of control valves constituting the first control valve 11 may increase.

As shown in FIG. 4, the first control valve 11 is supported by the support plate 34 at a position above the fuel tank 23. The front portion of the first control valve 11 is located above the fuel tank 23. The rear portion of the first control valve 11 is located above the extension portion 22b (described later) of the hydraulic oil tank 22.
As shown in FIG. 3, the support plate 34 is supported by the front bracket 35 and the rear bracket 36 at a position above the fuel tank 23. The support plate 34 is a substantially rectangular flat plate in a plan view, and supports the lower surface of the first control valve 11. The support plate 34 is arranged so that the long side faces the front-rear direction and the short side faces the machine body width direction. The support plate 34 and the first control valve 11 are fixed by bolts.

The front bracket 35 is arranged on one side (front side) of the control valves V1 to V13 in the parallel direction from the center of the support plate 34 in the longitudinal direction. The end of the front bracket 35 on the side (left side) inside the machine body protrudes from the left edge of the support plate 34, and the end on the outside side (right side) of the machine body is located below the support plate 34. The end portion of the front bracket 35 on the machine body side is located above the right portion of the upper plate 67, and is connected to the upper plate 67 by a bolt BL1.

The rear bracket 36 is arranged on the other side (rear side) of the control valves V1 to V13 in the parallel direction from the center in the longitudinal direction of the support plate 34. That is, the front bracket 35 and the rear bracket 36 are separated from each other in the parallel direction (front-rear direction) of the control valves V1 to V13. The rear bracket 36 has an end portion on the outer side (right side) of the machine body protruding from the right edge of the support plate 34, and an end portion on the inner side (left side) of the machine body protruding from the left side edge of the support plate 34. The end of the rear bracket 36 on the outer side of the machine body is connected to the support base 69 provided above the battery 24 by the bolt BL2. The end portion of the rear bracket 36 on the machine body side is connected to the upper end of the support column 99 erected on the swivel board 9 by a bolt BL3.
<Switching valve>
As shown in FIGS. 6 to 9, a switching valve 80 connected to the control valve constituting the first control valve 11 is arranged above the first control valve 11. The switching valve 80 is a three-way switching valve. The switching valve 80 has an inlet port 81, a first outlet port 82, a second outlet port 83, and an operation handle 84. The switching valve 80 can switch the destination of the hydraulic oil introduced from the inlet port 81 to the first outlet port 82 or the second outlet port 83 by switching the operation handle 84.

A return oil passage 85 is connected to the inlet port 81. The first oil passage 86 is connected to the first outlet port 82. A second oil passage 87 is connected to the second outlet port 83. As a result, the switching valve 80 can switch the connection destination of the return oil passage 85 to either the first oil passage 86 or the second oil passage 87.
The return oil passage 85 is an oil passage for returning the hydraulic oil from the hydraulic equipment to the hydraulic oil tank 22, and has a connector 85A, a pipe joint 85B, and a hydraulic hose 85C. The connector 85A is connected to the inlet port 81 of the switching valve 80. The pipe joint 85B connects the connector 85A and the hydraulic hose 85C. The hydraulic hose 85C connects the pipe joint 85B and the hydraulic device.

The first oil passage 86 is composed of a pipe material (first pipe material). This first pipe material has a first connecting member 86A, a connecting pipe 86B, and a pipe joint 86C. The central axes of the pipe joint 86C and the connecting pipe 86B are arranged in the vertical direction. The first connecting member 86A is connected to the first outlet port 82 of the switching valve 80. In the pipe joint 86C, one end (upper end) is connected to the lower part of the first connecting member 86A, and the other end (lower end) is connected to one end (upper end) of the connecting pipe 86B. One end (upper end) of the connection pipe 86B is connected to the other end (lower end) of the pipe joint 86C, and the other end (lower end) is connected to the upper inlet port of the control valve V8. The first connecting member 86A, connecting pipe 86B, and pipe joint 86C are formed of a rigid material such as metal. The pipe joint 86C has an O-ring built-in, and the effect of preventing loosening is enhanced.

The second oil passage 87 (second pipe material) has a hydraulic hose 87A and a second connecting member 87B. In this embodiment, the hydraulic hose 87A is formed of a flexible material such as rubber. One end of the hydraulic hose 87A is connected to the second outlet port 83 of the switching valve 80. The second connecting member 87B is provided in an oil passage returning from the outlet port of the control valve V5 to the hydraulic oil tank 22. The other end of the hydraulic hose 87A is connected to the second connecting member 87B.

As shown in FIG. 8, the second connecting member 87B and the outlet port of the control valve V5 are connected by the first pipe 88, the pipe joint 89, the second pipe 90, and the connector 91. One end of the first pipe 88 is connected to the outlet port of the control valve V5, and the other end is connected to the pipe joint 89. The pipe joint 89 connects the other end of the first pipe 88 with the connector 91. One end of the second pipe 90 is connected to the connector 91, and the other end is connected to the second connecting member 87B.

A hydraulic hose 93 is connected to the second connecting member 87B via a pipe joint 92. The hydraulic hose 93 is connected to the hydraulic oil tank 22. When the switching valve 80 connects the return oil passage 85 and the second oil passage 87, the hydraulic oil that has passed through the return oil passage 85 enters the hydraulic hose 93 through the second oil passage 87 and enters the hydraulic oil. It is returned to the tank 22. When the switching valve 80 connects the return oil passage 85 and the first oil passage 86, the hydraulic oil that has passed through the return oil passage 85 enters the inlet port of the control valve V8.

The switching valve 80 is supported at a position above the first control valve 11 by the first pipe material forming the first oil passage 86. Since the first pipe material (first connecting member 86A, connecting pipe 86B, and pipe joint 86C) forming the first oil passage 86 is made of a rigid material, a switching valve does not require a special support member. The 80 can be supported at a position above the control valve constituting the first control valve 11 (in the case of the present embodiment, above the control valve V8).

Instead of connecting the second outlet port 83 and the second connecting member 87B with a flexible hydraulic hose 87A, a pipe material formed of a rigid material such as metal may be used for connecting the second outlet port 83 and the second connecting member 87B. That is, the second oil passage 87 may be a pipe material formed of a rigid material. In this case, the switching valve 80 can be supported above the first control valve 11 by both the pipe material and the first pipe material forming the first oil passage 86.

As shown in FIG. 9, the switching valve 80 is arranged so that the rotation shaft 84a of the operation handle 84 faces in the vertical direction (vertical direction).
When the switching valve 80 is arranged so that the rotating shaft 84 a faces the horizontal direction, it is necessary to increase the switching force (force required for switching) in order to prevent the switching valve 80 from switching due to the weight of the operation handle 84. There is. Therefore, the force required for the operator to perform the switching operation becomes large.

On the other hand, in the present embodiment, since the switching valve 80 is arranged so that the rotation shaft 84a of the operating handle 84 faces in the vertical direction, the switching valve 80 is not switched by the own weight of the operating handle 84. Therefore, it is not necessary to set a large switching force of the switching valve 80, so that the operator can easily perform the switching operation.
Further, in the present embodiment, the upper part of the switching valve 80 is covered with the third cover 27 (upper cover). In this case, if the operation handle 84 is arranged so that the rotation shaft 84a faces the horizontal direction, the operation handle 84 and the third cover 27 may interfere with each other. Therefore, in order to prevent this interference, the handle must be formed short, and the force required for operating the handle becomes large.

On the other hand, in the case of the present embodiment, since the switching valve 80 is arranged so that the rotation shaft 84a of the operation handle 84 faces in the vertical direction, it is possible to prevent the operation handle 84 from interfering with the third cover 27. At the same time, the length of the handle can be increased to reduce the force required to operate the handle.
<Arrangement of refueling switches, etc.>
As shown in FIGS. 10 and 11, a refueling unit 48 is provided in front of the upper surface of the fuel tank 23 and in front of the first control valve 11. The refueling unit 48 has an opening for replenishing the fuel tank 23 with fuel using a fuel refueling device, and the opening is closed by a removable cap 50. A tubular body 58 is provided so as to be on the left side of the refueling unit 48 and in front of the first control valve 11. The cylinder 58 communicates with the inside of the fuel tank 23. A fuel sensor 53 is attached to the cylinder body 58. A fuel gauge 54 is provided in front of the fuel sensor 53. The fuel sensor 53 and the fuel gauge 54 are arranged between the refueling unit 48 and the hose connection unit 52 described later. A fuel return portion 56 is provided on the front portion of the upper surface of the fuel tank 23 and on the right side of the refueling portion 48. A return pipe 57 for returning the fuel overflowing from the injection pump that injects fuel into the combustion chamber of the engine E1 to the fuel tank 23 is connected to the fuel return unit 56.

As shown in FIG. 10, a refueling pump 40 is provided on one side (left side) of the fuel tank 23. The refueling pump 40 is used to supply fuel to the fuel tank 23 from a fuel storage container such as a drum can. The refueling pump 40 is attached to the first bracket 41. The first bracket 41 has a first plate 41a and a second plate 41b. The first plate 41a extends in the front-rear direction, and the other side surface (left surface) in the body width direction is attached to the one side surface (right side) of the left frame 49L of the center frame 49 in the body width direction. A refueling pump 40 is attached to one surface (right surface) of the first plate 41a in the width direction of the machine body. The second plate 41b is located in front of the first plate 41a and extends in the width direction of the machine body. The other end (left end) of the second plate 41b in the body width direction is attached to one side (right side) of the left frame 49L in the body width direction. The first plate 41a and the second plate 41b are integrally formed.

A refueling switch 42 is provided at the first position above the fuel tank 23. The first position is above the fuel tank 23 and near the horizontal outer edge of the airframe 2. In the case of the present embodiment, the first position is above the fuel tank 23, and is outside (right side) and front of the first control valve 11 in the width direction of the machine body. The refueling switch 42 is a switch that switches the refueling pump 40 between an operating state and a stopped state. The refueling switch 42 has an operation push button 42a and a stop push button 42b. The refueling switch 42 is attached to the second bracket 46.

As shown in FIGS. 11, 12, and 7, the second bracket 46 has a first plate 46a, a second plate 46b, and a third plate 46c. The first plate 46a extends in the width direction of the machine body, and is arranged so that one surface faces the front (refueling unit 48 side) and the other surface faces the rear (first control valve 11 side). The first plate 46a is attached to the right portion of the mounting plate 47 fixed to the front end portion of the support plate 34 by bolts, and extends to the right from the mounting plate 47. The first plate 46a has a shape in which two corners on the diagonal line of a rectangle are cut out, and has a first cutout portion 46d and a second cutout portion 46e. The first notch 46d is provided in the upper left portion (the upper portion on the other side in the width direction of the machine body) of the first plate 46a. The second notch 46e is provided in the lower right portion (lower portion on one side in the width direction of the machine body) of the first plate 46a. The first notch 46d is provided to prevent interference between the piping such as the blazer pipe 59 and the second bracket 46. The second notch 46e is provided to prevent interference between the pipe such as the return pipe 57 and the second bracket 46.

The second plate 46b is bent rearward from the upper end portion of the first plate 46a. More specifically, the second plate 46b is bent rearward from the right side (one side in the width direction of the machine body) of the first notch 46d. The second plate 46b is arranged with one side facing upward and the other side facing downward.
The third plate 46c is a right end portion (one end portion in the width direction of the machine body) of the first plate 46a and is bent rearward from above the second notch portion 46e of the first plate 46a. The third plate 46c is arranged so that one side faces the right side (outside the machine body) and the other side faces the left side (inside the machine body). A push button 42a for operation and a push button 42b for stop are attached to the third plate 46c. The operation push button 42a and the stop push button 42b are arranged so that the operation surface faces the right side (outside the machine body).

The third plate 46c has a third notch 46f and a fourth notch 46g. The third notch 46f is provided at the rear upper corner of the third plate 46c. The fourth notch 46g is provided at the lower rear corner of the third plate 46c. By providing the third notch portion 46f and the fourth notch portion 46g, it is possible to prevent the hose 44, which will be described later, from coming into contact with the corner of the second bracket 46. The upper end of the third plate 46c is connected (welded) to the right end of the second plate 46b. As a result, the strength (rigidity) of the second bracket 46 is increased. Further, the upper side and the front side of the wiring connected to the refueling switch 42 are protected by the second plate 46b and the third plate 46c.

At a position different from above the fuel tank 23 (referred to as the second position), a control device 43 of the refueling pump 21 different from the refueling switch 42 is provided. In the present embodiment, the control device 43 is provided on one side (left side) of the fuel tank 23, but is provided at another position (for example, behind the fuel tank 23) different from above the fuel tank 23. You may. In the present embodiment, the control device 43 is a relay for driving the refueling pump 21 (hereinafter referred to as the relay 43), but may be a control device for the refueling pump 21 different from the relay 43.

As shown in FIG. 10, the relay 43 is attached to the front surface of the second plate 41b of the first bracket 41. That is, the refueling pump 40 and the relay 43 are both attached to the first bracket 41. In other words, the first bracket 41 also serves as a bracket for attaching the refueling pump 40 and a bracket for attaching the relay 43. The relay 43 is located in front of the refueling pump 40 and on one side (left side) of the front portion of the first control valve 11. As a result, the relay 43 is located at the front portion of the machine body 2, so that the maintenance of the relay 43 becomes easy. However, the position of the relay 43 is not limited to the front part of the machine body 2, and may be another position (such as the rear part of the body 2). The upper part of the relay 43 is covered with the sixth cover (center cover) 30. As a result, the relay 43 can be protected from rain, earth and sand, etc. without providing a special cover for protecting the relay 43.

As described above, in the present embodiment, among the control devices of the refueling pump 21, the refueling switch 42 is provided at the first position above the fuel tank 23, and the control device (relay) 43 different from the refueling switch 42 is provided in the fuel tank. It is provided at a second position different from the upper part of 23. As a result, the space occupied by the control device of the refueling pump 21 can be reduced above the fuel tank 23. Therefore, the first control valve 11 can be extended (lengthened), and the number of valves (sections) of the first control valve 11 can be easily increased in accordance with a change in the specifications of the working machine 1. ..

Further, since the refueling switch 42, which is frequently accessed by the operator, is arranged above the fuel tank 23 and outside (right side) in the body width direction of the first control valve 11, the operator can refuel the refueling switch 42. Can be easily accessed, and the workability of refueling is improved. On the other hand, since the control devices (relay 43, etc.) other than the refueling switch 42 are rarely accessed by the operator, there is almost no inconvenience even if they are arranged on one side (left side) of the fuel tank 23. That is, in the present embodiment, with respect to the control device of the refueling pump 21, the arrangement of the refueling switch 42 and the control device (relay or the like) 43 other than the refueling switch 42 is set by paying attention to the frequency of access by the operator. There is.

Further, since the first bracket 41 also serves as a bracket for mounting the refueling pump 40 and a bracket for mounting the relay 43, the refueling switch 42 and the control device (relay) 43 are placed at different positions (first). It is possible to prevent an increase in the number of parts due to the arrangement at the 1st position and the 2nd position). Further, since the refueling pump 40 and the control device 43 are arranged at close positions, the wiring (electric wire) connecting the refueling pump 40 and the control device 43 can be shortened.

As shown in FIGS. 11 and 12, a blazer pipe 59 is fixed to the second bracket 46. One end of the blazer pipe 59 is connected to the side portion of the tubular body 58. As a result, one end of the blazer pipe 59 communicates with the inside of the fuel tank 23.
The blazer pipe 59 has a first portion 59a, a second portion 59b, a third portion 59c, a fourth portion 59d, and a fifth portion 59e. The first portion 59a extends to the right from the side portion of the tubular body 58. The second portion 59b bends from the right end of the first portion 59a and extends upward. The third portion 59c bends from the upper end of the second portion 59b and extends rearward. The fourth portion 59d bends from the rear end of the third portion 59c and extends downward. The fifth portion 59e bends from the lower end of the fourth portion 59d and extends rearward and downward.

The fourth portion 59d is fixed by welding to the vertically extending edge of the first notch 46d of the second bracket 46. As a result, the second bracket 46 and the blazer pipe 59 are integrated. By integrating the blazer pipe 59 with the second bracket 46 to which the refueling switch 42 is attached in this way, a bracket for attaching the blazer pipe 59 becomes unnecessary. Therefore, the space required for installing the blazer pipe 59 is reduced, and the number of parts can be reduced.

As shown in FIG. 10, one end side 44a of the hose 44 is connected to the suction portion 40a of the refueling pump 40. The hose 44 extends from the suction portion 40a toward the fuel tank 23 side (right side), then curves and extends forward, curves along the upper front surface of the fuel tank 23, extends rearward, and then extends downward. .. As shown in FIG. 11, the middle part of the hose 44 is held by the clamp 55. The clamp 55 is a leaf spring fixed to the upper surface of the fuel tank 23, and presses the hose 44 to the front surface of the fuel tank 23. As shown in FIG. 10, the other end side 44b of the hose 44 is housed in the storage part 45. The storage portion 45 has a cylindrical shape, is provided on the other side (right side) of the fuel tank 23, and is fixed to the other side side surface (right side) of the fuel tank 23. The storage portion 45 is located on the right side of the front portion of the first control valve 11. Therefore, the refueling switch 42 provided in front of the first control valve 11 is located in the vicinity of the accommodating portion 45.

As shown in FIG. 10, one end of the hose 51 is connected to the discharge portion 40b of the refueling pump 40. As shown in FIG. 11, the other end of the hose 51 is connected to a hose connecting portion 52 provided on the front portion of the upper surface of the fuel tank 23. The hose connection portion 52 is provided in front of the first control valve 11.
When refueling the fuel tank 23 from the fuel storage container, the other end side 44b of the hose 44 is taken out from the storage portion 45, connected to the fuel storage container, and the operating push button 42a is pressed to turn on the refueling switch 42. Switch to. As a result, the refueling pump 40 operates, and the fuel in the fuel storage container is supplied from the hose connection portion 52 into the fuel tank 23 through the hose 44 and the hose 45. Since the refueling switch 42 is located in the vicinity of the storage portion 45 during this replenishment work, the operator can easily recognize the refueling switch 42 when the hose 44 is taken out from the storage portion 45.
<Second control valve>
As shown in FIGS. 13 to 15, the hydraulic oil tank 22 has a main body portion 22a and an extension portion 22b, and is formed in an L shape in a side view. The main body 22a has a rectangular parallelepiped shape that is long in the vertical direction. The extending portion 22b extends forward from the lower front portion of the main body portion 22a.

The bracket 60 is fixed to the surface (left surface) of the main body 22a of the hydraulic oil tank 22 toward the inside of the machine. The bracket 60 is an L-shaped metal plate in a plan view, and has a first plate 60a and a second plate 60b. The first plate 60a is fixed to the surface of the main body 22a on the side of the machine body by welding or the like. The second plate 60b is bent from the rear end portion of the first plate 60a toward the inside of the aircraft. One side of the second plate 60b faces forward and the other side faces backward.

A second control valve 12 is attached to the front surface of the second plate 60b by bolts (not shown). That is, the second control valve 12 is attached to the surface of the main body 22a of the hydraulic oil tank 22 toward the inside of the machine via the bracket 60.
The second control valve 12 is configured by consolidating (integrating) a plurality of valves that control the supply of hydraulic oil to the first control valve 11 into one body. As a result, only one bracket is required to attach the plurality of valves to the hydraulic oil tank 22, so that the number of parts can be reduced. In the present embodiment, the second control valve 12 is configured by integrating (integrating) four valves. These four valves are proportional electromagnetic type valves. Hereinafter, the four valves constituting the second control valve 12 are referred to as a first proportional valve 12A, a second proportional valve 12B, a third proportional valve 12C, and a fourth proportional valve 12D, respectively.

The first proportional valve 12A is connected to one side of the pressure receiving portion of the first control valve V2 for SP via the first hydraulic hose 61. The second proportional valve 12B is connected to the other side of the pressure receiving portion of the first control valve V2 for SP via the second hydraulic hose 62. The third proportional valve 12C is connected to one side of the pressure receiving portion of the second control valve V8 for SP via the third hydraulic hose 63. The fourth proportional valve 12D is connected to the other side of the pressure receiving portion of the second control valve V8 for SP via the fourth hydraulic hose 64.

The first control valve V2 for SP controls the flow rate of the hydraulic oil supplied to the hydraulic actuator based on the pressure of the pilot oil (pilot pressure) supplied from the first proportional valve 12A or the second proportional valve 12B. The second control valve V8 for SP controls the flow rate of the hydraulic oil supplied to the hydraulic actuator based on the pilot pressure supplied from the third proportional valve 12C or the fourth proportional valve 12D.

As shown in FIGS. 13 and 15, the plurality of valves (first proportional valve 12A, second proportional valve 12B, third proportional valve 12C, fourth proportional valve 12D) constituting the second control valve 12 are in the vertical direction. They are provided side by side (up and down direction). As shown in FIG. 13, the first proportional valve 12A has a connecting portion (hereinafter, referred to as a first connecting portion) 12Aa for connecting the first hydraulic hose 61. The second proportional valve 12B has a connecting portion (hereinafter, referred to as a second connecting portion) 12Ba for connecting the second hydraulic hose 62. The third proportional valve 12C has a connecting portion (hereinafter, referred to as a third connecting portion) 12Ca for connecting the third hydraulic hose 63. The fourth proportional valve 12D has a connecting portion (hereinafter, referred to as a fourth connecting portion) 12Da for connecting the fourth hydraulic hose 64. The first connection portion 12Aa, the second connection portion 12Ba, the third connection portion 12Ca, and the fourth connection portion 12Da are provided side by side (left side) on the opposite side (left side) of the hydraulic oil tank 22 in the vertical direction.

As shown in FIG. 15, connection pipes are connected to the first connection portion 12Aa, the second connection portion 12Ba, the third connection portion 12Ca, and the fourth connection portion 12Da, respectively. Hereinafter, the connection pipe connected to the first connection portion 12Aa is connected to the first connection pipe 71, the connection pipe connected to the second connection portion 12Ba is connected to the second connection pipe 72, and the connection pipe is connected to the third connection portion 12Ca. The connecting pipe connected to the third connecting pipe 73 and the fourth connecting portion 12Da is referred to as the fourth connecting pipe 74. Each connecting pipe forms an L-shaped pipe line in a plan view, with one end facing the outside of the machine body (hydraulic oil tank 22 side) and the other end facing forward.

One end side of the first connection pipe 71 is connected to the first connection portion 12Aa, and the first hydraulic hose 61 is connected to the other end side. One end side of the second connecting pipe 72 is connected to the second connecting portion 12Ba, and the second hydraulic hose 62 is connected to the other end side. One end side of the third connecting pipe 73 is connected to the third connecting portion 12Ca, and the third hydraulic hose 63 is connected to the other end side. One end of the fourth connecting pipe 74 is connected to the fourth connecting portion 12Da, and the fourth hydraulic hose 64 is connected to the other end.

The first hydraulic hose 61 extends forward from the other end side of the first connecting pipe 71 and is connected to one side of the pressure receiving portion of the first control valve V2 for SP. The second hydraulic hose 62 extends forward from the other end side of the second connecting pipe 72 and is connected to the other side of the pressure receiving portion of the first control valve V2 for SP. The third hydraulic hose 63 extends forward from the other end side of the third connecting pipe 73 and is connected to one side of the pressure receiving portion of the second control valve V8 for SP. The fourth hydraulic hose 64 extends forward from the other end side of the fourth connecting pipe 74 and is connected to the other side of the pressure receiving portion of the second control valve V8 for SP.

As described above, the second control valve 12 has a plurality of hydraulic hose connection portions (first connection portion 12Aa, second connection portion 12Ba, third connection portion 12Ca, fourth connection) on the opposite side of the hydraulic oil tank 22. It has a portion 12Da), and the connecting portions are provided side by side in the vertical direction. Therefore, the hydraulic hoses connected to each connection portion can be extended substantially linearly in the same direction (forward) without interfering with each other. As a result, the space occupied by the hydraulic hose is reduced, and it is possible to reliably secure a space for arranging the hydraulic hose.

Two hose connection portions are provided on the upper portion of the second control valve 12. One hose connection portion (hereinafter referred to as a fifth connection portion) 12a is connected to the second pump of the hydraulic pump 21 via the hydraulic hose 65. The other hose connection portion (hereinafter referred to as the sixth connection portion) 12b is connected to the hydraulic oil tank 22 via the hydraulic hose 66. That is, the fifth connection portion 12a is a pump port, and the sixth connection portion 12b is a tank port.

In this way, in the second control valve 12, the pump port and the tank port of a plurality of valves (first proportional valve 12A, second proportional valve 12B, third proportional valve 12C, fourth proportional valve 12D) are shared. ing. In other words, the pump port (fifth connection portion) 12a also serves as the pump port of a plurality of valves constituting the second control valve 12. Further, the tank port (sixth connection portion) 12b also serves as a tank port for a plurality of valves constituting the second control valve 12. Therefore, the size of the second control valve 12 can be reduced, and the number of hydraulic hoses connected to the second connection valve 12 can be reduced. As a result, the assembling property of the hydraulic hose to the second connection valve 12 is improved.
<Heater hose>
As shown in FIG. 16, a step 20 for supporting the driver's seat 6 from below is provided above the swivel board 9. Step 20 is arranged at a distance from the swivel board 9. As shown in FIG. 17, a support base 75 is fixed to the upper surface of the step 20, and the driver's seat 6 is supported on the support base 75. The air conditioner unit 70 is arranged above the step 20 and below the driver's seat 6. The air conditioner unit 70, together with the receiver 37, the condenser 38, and the compressor 39, constitutes an air conditioner that adjusts the temperature inside the cabin 5.

As shown in FIG. 16, a heater hose 76 is arranged below the step 20. The heater hose 76 connects the engine (first device) E1 and the air conditioner unit (second device) 70.
As shown in FIGS. 5 and 19, the heater hose 76 has a first hose 761 and a second hose 762. The first hose 761 and the second hose 762 pass between the step 20 and the swivel board 9.

As shown in FIG. 19, the first hose 761 has a first feed hose 761A and a first return hose 761B. The second hose 762 has a second feed hose 762A and a second return hose 762B. One end of the first hose 761 (first feed hose 761A and first return hose 761B) is connected to the engine E1, and the other end is connected to the first connector 77. One end of the second hose 762 (the second feed hose 762A and the second return hose 762B) is connected to the air conditioner unit 70, and the other end is connected to the first connector 77. That is, the first hose 761 and the second hose 762 are connected by the first connector 77.

As shown in FIG. 5, the first hose 761 is guided below the step 20 from the engine room E2 in which the engine E1 is arranged through the opening 32b of the second vertical rib 32. As shown in FIG. 16, the second hose 762 is guided from above step 20 in which the air conditioner unit 70 is arranged to below step 20 through an opening 20a provided in the right rear portion of step 20. ..

As shown in FIG. 19, the first connector 77 has a feed connection portion 77A to which a feed hose can be connected and can pass through hydraulic oil, and a feed connection portion 77B to which a return hose can be connected and can pass through hydraulic oil. And have. The feed connection portion 77A and the feed connection portion 77B are composed of a pipe material (pipe). The feed connection portion 77A and the return connection portion 77B are bent in a substantially U shape and arranged side by side. The feed connecting portion 77A is parallel to the first portion 771A extending in the vertical direction, the second portion 772A extending substantially perpendicular to the upper end portion of the first portion 771A, and the second portion 772A from the lower end portion of the first portion 771A. It has a third portion 773A that extends. The return connecting portion 77B is parallel to the first portion 771B extending in the vertical direction, the second portion 772B extending substantially perpendicularly from the upper end portion of the first portion 771B, and the second portion 772B from the lower end portion of the first portion 771B. It has a third portion 773B that extends.

The other end of the second feed hose 762A is connected to the second portion 772A of the feed connection portion 77A. The other end of the first feed hose 761A is connected to the third portion 773A of the feed connection portion 77A. The other end of the second return hose 762B is connected to the second portion 772B of the return connection portion 77B. The other end of the first return hose 761B is connected to the third portion 773B of the return connection portion 77B. Therefore, the first connector 77 connects the first hose 761 and the second hose 762 in the vertical direction. In other words, the first connector 77 has a connecting portion that connects the first hose 761 and the second hose 762 arranged below the first hose 761.

The hot water warmed by the water jacket of the engine E1 is sent from the first feed hose 761A through the feed connection portion 77A and the second feed hose 762A to the heat exchanger of the air conditioner unit 70, and the air warmed by the hot water is sent. It is supplied into the cabin 5. The hot water sent to the heat exchanger of the air conditioner unit 70 is returned to the water jacket of the engine E1 from the second return hose 762B through the return connection portion 77B and the first return hose 761B in a state where the temperature is lowered.

The first connector 77 is supported on the swivel board 9 by the bracket 78 below the step 20. The bracket 78 is fixed below the step 20 and on the swivel board 9. The bracket 78 has a substrate portion 78a, a vertical plate portion 78b, and a fixing portion 78c. The substrate portion 78a is fixed on the swivel board 9 by inserting a bolt into the mounting hole 78d and screwing it into a screw hole provided in the swivel board 9. The vertical plate portion 78b bends from the edge of the substrate portion 78a and extends upward. The vertical plate portion 78b is arranged so that one surface is directed to the right and rear (diagonally to the right) and the other surface is directed to the left and front (diagonally to the left). The fixing portion 78c is provided on one surface of the vertical plate portion 78b, and has two projecting pieces 781c and 782c protruding in a direction away from the one side surface. One projecting piece 781c is connected (welded) to the first portion 771A of the feed connecting portion 77A. The other projecting piece 782c is connected (welded) to the first portion 771B of the return connecting portion 77B.

As shown in FIGS. 4 and 5, the first connector 77 and the bracket 78 are located on the one end portion 9b side in the width direction of the swivel substrate 9 and away from the vertical axis (swivel axis) O which is the center of swivel. Is located in. Specifically, the first connector 77 and the bracket 78 are provided on the one end portion 9b side of the intermediate point M between the vertical axis O and the one end portion 9b in the direction perpendicular to the vertical axis O on the swivel substrate 9. There is. In the present embodiment, one end of the swivel board 9 in the direction perpendicular to the vertical axis O is one end 9b in the width direction (same as the body width direction) of the swivel board 9. Further, in the present embodiment, the one end portion 9b of the swivel board 9 in the width direction is the left end portion of the swivel board 9. Further, the first connector 77 and the bracket 78 are provided on the swivel substrate 9 on the outer side in the direction perpendicular to the vertical axis O from the outer circumference of the swivel bearing 8 (shown by a broken line in FIGS. 4 and 5). More specifically, the first connector 77 and the bracket 78 are provided within a range that the operator can reach from the other side (left side) of the machine body 2 by inserting his / her hand below the step 20.

This facilitates the connection work between the first hose 761 connected to the engine E1 and the second hose 762 connected to the air conditioner unit 70. Specifically, the work of connecting the first hose 761 and the second hose 762 via the first connector 77 does not need to be performed by the operator by deeply inserting the upper body below the step 20, and the machine body 2 This can be done by inserting a hand below step 20 from the other side (left side).
<Air conditioner hose>
As shown in FIG. 16, an air conditioner hose 94 is arranged below the step 20. The air conditioner hose 94 connects the air conditioner unit (second device) 70, the receiver 37, and the compressor 39 (collectively referred to as the third device).

As shown in FIG. 5, the air conditioner hose 94 has a third hose 941 and a fourth hose 942. The third hose 941 and the fourth hose 942 pass between the step 20 and the swivel board 9.
The third hose 941 has a hose 941A and a hose 941B. One end of the third hose 941A is connected to the compressor 39, and the other end is connected to the second connector 95. One end of the other hose 941B is connected to the receiver 37, and the other end is connected to the second connector 95. The fourth hose 942 has a hose 942A and a hose 942B. One end of the fourth hose 942 (hose 942A, 942B) is connected to the air conditioner unit 70, and the other end is connected to the second connector 95. That is, the third hose 941 and the fourth hose 942 are connected by the second connector 95. Further, since the second connector 95 and the first connector 77 are arranged close to each other, the connection work of the second connector 95 and the connection work of the first connector 77 can be easily performed.

As shown in FIG. 5, the third hose 941 is guided below the step 20 from the engine room E2 in which the compressor 39 and the receiver 37 are arranged through the notch 32a of the second vertical rib 32. As shown in FIG. 16, the fourth hose 942 is guided from above step 20 in which the air conditioner unit 70 is arranged to below step 20 through an opening 20a provided in the right rear portion of step 20. ..

The second connector 95 has two hose joints 95A and 95B. One hose joint 95A connects the hose 941A and the hose 942A. The other hose joint 95B connects the hose 941B and the hose 942B. The two hose joints 95A and 95B connect the third hose 941 (hose 941A, hose 941B) and the fourth hose 942 (hose 942A, 942B) in the front-rear direction. In other words, the second connector 95 has a connecting portion for connecting the third hose 763 and the fourth hose 764 arranged substantially horizontally with respect to the third hose 763.

The second connector 95 (hose joints 95A and 95B) is arranged at a position on the one end portion 9b side in the width direction of the swivel substrate 9 and away from the vertical axis (swivel axis) O. Specifically, the second connector 95 is located at one end 9b side of the intermediate point M between the vertical axis O and one end (the other end in the width direction of the machine body) 9b of the swivel board 9 in the width direction. It is provided. Further, the second connector 95 is provided on the swivel substrate 9 outside the outer circumference of the swivel bearing 8. More specifically, the second connector 95 is provided within a range that the operator can reach from the other side (left side) of the machine body 2 by inserting his / her hand below the step 20.

This facilitates the connection work between the third hose 941 connected to the receiver 37 and the compressor 39 (third device) and the fourth hose 942 connected to the air conditioner unit 70, respectively. Specifically, the work of connecting the third hose 941 and the fourth hose 942 via the second connector 95 does not require the operator to deeply insert the upper body below the step 20, and the machine body 2 This can be done by inserting a hand below step 20 from the other side (left side).

Here, the first connector 77 is fixed on the swivel board 9 via the bracket 78, but the second connector 95 is not fixed on the swivel board 9. Therefore, in order to maintain the second connector 95 at a position away from the vertical axis O, it is necessary to regulate the movement of the second connector 95. In this embodiment, a plurality of hose guides are provided to regulate the movement of the second connector 95.

As shown in FIGS. 4 and 5, the hose guide has a first hose guide 96 and a second hose guide 97.
The first hose guide 96 is arranged on the vertical axis O side (between the intermediate point M and the vertical axis O) with respect to the intermediate point M. Specifically, the first hose guide 96 is arranged inside the swivel bearing 8 in the direction perpendicular to the vertical axis O and in front of the vertical axis O. The first hose guide 96 is formed in a straight line, and the lower end portion thereof is fixed on the swivel substrate 9 and extends upward.

The second hose guide 97 is arranged on the one end portion 9b side of the intermediate point M. Specifically, the second hose guide 97 is arranged outside the outer circumference of the swivel bearing 8 in the direction perpendicular to the vertical axis O and in front of the vertical axis O. The second hose guide 97 has a first portion 97a and a second portion 97b. The lower end of the first portion 97a is fixed on the swivel substrate 9 and extends upward. The second portion 97b bends at a substantially right angle from the upper end portion of the first portion 97a and extends rearward.

The first hose guide 96 and the second hose guide 97 guide the third hose 941. The third hose 941 (hose 941A, hose 941B) is guided from the engine room E2 through the notch 32a of the second vertical rib 32 to the lower part of step 20, and is guided by the first hose guide 96 and the second hose guide 97. Has been done. Specifically, the third hose 941 is guided so as to extend toward one end 9b side while being restricted from moving forward by abutting on the first hose guide 96, and further abuts on the second hose guide 97. As a result, the hose is guided so as to extend to the one end portion 9b side while being restricted from moving forward and upward.

In this way, since the third hose 941 is guided while being regulated by the first hose guide 96 and the second hose guide 97, the movement of the second connector 95 connected to the third hose 941 is restricted. .. Further, the movement of the second connector 95 is also restricted by the fact that the second connector 95 is provided on the one end portion 9b side of the bracket 78 that supports the first connector 77. As a result, the second connector 95 is maintained at a position away from the vertical axis O.

In the present embodiment, two hose guides (first hose guide 96 and second hose guide 97) are provided as a plurality of hose guides for guiding the third hose 941, but three or more hose guides are provided. It may be provided. Further, the plurality of hose guides may include those having different shapes as in the present embodiment, or may all have the same shape.
<Around the driver's seat>
As shown in FIGS. 17 and 18, operating levers 101L and 101R are provided on the left and right sides of the driver's seat 6. The operating levers 101L and 101R are connected to a pilot valve (not shown) operated by the operating lever.

The pilot valve connected to the left operating lever 101L is a swivel / arm pilot valve. The swivel / arm pilot valve is connected to the swivel control valve V4 and the arm control valve V7 via a pilot hose. The swivel / arm pilot valve is operated by the left operating lever 101L to operate the swivel control valve V4 and the arm control valve V7.

The pilot valve connected to the right operating lever 101R is a boom / bucket pilot valve. The boom / bucket pilot valve is connected to the boom control valve V5 and the bucket control valve V6 via a pilot hose. The boom / bucket pilot valve is operated by the right operating lever 101R to operate the boom control valve V5 and the bucket control valve V6.

A dozer lever 102 is provided on the right side of the driver's seat 6. The dozer lever 102 is a lever that operates the dozer device 7. The dozer lever 102 is connected to a dozer pilot valve operated by the lever. The pilot valve for the dozer is connected to the first control valve V13 for the dozer via a pilot hose.
Traveling levers 103L and 103R and operation pedals (swing pedal 104 and SP pedal 105) are provided in front of the driver's seat 6. The traveling lever 103L on the left side is a lever that operates the traveling device 3 on the left side. The traveling lever 103R on the right side is a lever that operates the traveling device 3 on the right side. The swing pedal 104 is a pedal that swings the swing bracket 14. The SP pedal 105 is a pedal that operates a hydraulic attachment that is mounted instead of the bucket 17.

The traveling levers 103L and 103R are arranged in front of the driver's seat 6. The traveling levers 103L and 103R are connected to a traveling pilot valve below step 20. The traveling pilot valve is connected to the traveling right control valve V10 and the traveling left control valve V12 via a pilot hose. The traveling pilot valve controls the traveling right control valve V10 and the traveling left control valve V12 by being operated by the left and right traveling levers 103L and 103R. Traveling pedals 106L and 106R are provided in front of the driver's seat 6, and the traveling device 3 can also be operated by the traveling pedals 106L and 106R.

The swing pedal 104 is arranged to the right of the traveling levers 103L and 103R. The swing pedal 104 is connected to a swing pilot valve below step 20. The swing pilot valve is connected to the swing control valve V2 via a pilot hose. The swing pilot valve controls the swing control valve V2 by being operated by the swing pedal 104.

The SP pedal 105 is arranged to the left of the traveling levers 103L and 103R. The SP pedal 105 is connected to the SP pilot valve below step 20. The SP pilot valve is connected to the SP first control valve V8 and the SP second control valve V3 via a pilot hose. The SP pilot valve controls the SP first control valve V8 and the SP second control valve V3 by being operated by the SP pedal 105.
<Cabin>
As shown in FIGS. 20 to 22, the cabin 5 includes a first support column 121, a second support column 122, a third support column 123, a first connection plate 124, a second connection plate 125, a third connection plate 126, and a fourth connection. It includes a plate 127, a lower plate 128, and a reinforcing member 130.

The first support column 121, the second support column 122, and the third support column 123 are erected in the vicinity of the driver's seat 6. The first support column 121 has a front portion 121a, an upper portion 121b, and a rear portion 121c. The front portion 121a is a portion erected on the right front side of the driver's seat 6 and extends from the lower side to the upper side. The upper portion 121b is curved from the upper end portion of the front portion 121a and extends rearward. The rear portion 121c is curved and extends downward from the rear end portion of the upper portion 121b. The second support column 122 has a front portion 122a, an upper portion 122b, and a rear portion 122c. The front portion 122a is a portion erected on the left front side of the driver's seat 6 and extends from the lower side to the upper side. The upper portion 122b is curved and extends rearward from the upper end portion of the front portion 122a. The rear portion 122c is curved and extends downward from the rear end portion of the upper portion 122b. The third support column 123 is erected on the left side of the driver's seat 6. The third support column 123 is arranged behind the second support column 122 and extends from the lower side to the upper side. The upper end of the third support column 123 is connected to the middle part of the upper portion 122b.

A door 120 is attached to the third support column 123 so as to be openable and closable via a hinge. The operator can get on and off the cabin 5 by opening the door 120. That is, as shown in FIGS. 20 and 22, there is an entrance / exit 5a of the cabin 5 between the second support column 122 and the third support column 123.
As shown in FIG. 20, the first connecting plate 124 connects the lower portion of the front portion 121a of the first support column 121 and the lower portion of the front portion 122a of the second support column 122. The second connecting plate 125 connects the upper portion of the front portion 121a of the first support column 121 and the upper portion of the front portion 122a of the second support column 122. As shown in FIG. 21, the third connecting plate 126 connects the upper portion of the rear portion 121c of the first column 121 and the upper portion of the rear portion 122c of the second column 122. The fourth connecting plate 127 connects the lower portion of the rear portion 121c of the first column 121 and the lower portion of the rear portion 122c of the second column 122.

As shown in FIG. 21, the lower plate 128 is connected to the lower end portion of the support column (first support column 121, second support column 122, third support column 123). In the present embodiment, the lower plate 128 has an extension direction (direction parallel to the vertical axis O) in which the normal direction of the plate surface extends upward from the lower end of the columns (first column 121, second column 122, third column 123). ) Is arranged so as to be substantially parallel to. The columns (first column 121, second column 122, third column 123) are connected to the lower plate 128 and extend upward.

The lower plate 128 is a square frame-shaped plate, and has a front frame portion 128a, a left frame portion 128b, a right frame portion 128c, and a rear frame portion 128d. The front frame portion 128a extends in the width direction of the machine body and is connected to the lower end portion of the first support column 121 and the lower end portion of the second support column 122. The left frame portion 128b extends rearward from the left end portion of the front frame portion 128a and is connected to the lower end portion of the first support column 121 and the lower end portion of the third support column 123. The right frame portion 128c extends rearward from the right end portion of the front frame portion 128a. The rear frame portion 128d extends in the width direction of the machine body, and connects the rear end portion of the left frame portion 128b and the rear end portion of the right frame portion 128c.

As shown in FIG. 21, the lower plate 128 has a plurality of protruding portions 128e to 128j protruding inward of the cabin (direction approaching the driver's seat 6). In the present embodiment, the lower plate 128 has a first protruding portion 128e, a second protruding portion 128f, a third protruding portion 128g, a fourth protruding portion 128h, a fifth protruding portion 128i, and a sixth protruding portion 128j. ..
The first protruding portion 128e protrudes rearward from the left portion of the front frame portion 128a. The second protruding portion 128f protrudes rearward from the right portion of the front frame portion 128a. The third protruding portion 128g protrudes to the right from the front portion of the left frame portion 128b. The fourth protruding portion 128h protrudes to the right from the rear portion of the left frame portion 128b. The fifth protruding portion 128i protrudes to the left from the rear portion of the right frame portion 128c. The sixth protruding portion 128j protrudes forward from the left portion of the rear frame portion 128d.

Each of the protruding portions 128e to 128j has a fixing portion fixed to the machine body 2 by bolts. Each fixing portion has a through hole through which a bolt is inserted. Here, the fixed portion of the third protruding portion 128 g will be described as a typical example. As shown in FIGS. 23 and 24, the third protruding portion 128g has two fixing portions 133a and 133b. The two fixing portions 133a and 133b are provided at intervals in the front-rear direction (the length direction of the left frame portion 128b). Through holes are formed in the fixing portions 133a and 133b, and the lower plate 128 is fixed to the step 20 of the machine body 2 by the bolts inserted through the through holes. In other words, the step 20 is fixed to the upper part of the lower plate 128.

The vicinity of the entrance / exit 5a of the cabin 5 is reinforced by the reinforcing member 130 because it becomes a large opening when the door 120 is opened and the strength is lowered.
As shown in FIG. 22, the reinforcing member 130 has a first reinforcing member 131, a second reinforcing member 129, and a third reinforcing member 132. The first reinforcing member 131 is connected to the second support column 122, and the third reinforcing member 132 is connected to the third support column 123.

As shown in FIG. 24, the second reinforcing member 129 is arranged between the second support column 122 and the third support column 123, and extends in the front-rear direction. The second reinforcing member 129 has a first portion 129a and a second portion 129b. The first portion 129a and the second portion 129b are integrally formed.
The first portion 129a extends in the front-rear direction and connects the second support column 122 and the third support column 123. The lower end of the first portion 129a is connected (welded) to the upper surface of the left frame portion 128b of the lower plate 128, extends upward, then curves and extends to the right (inside the cabin 5). The first portion 129a has a first end portion connected (welded) to the strut at an end portion on the strut side. The first end portion has a first front end portion 129c connected (welded) to the second strut 122 and a first rear end portion 129d connected (welded) to the third strut 123.

The second portion 129b is formed integrally with the first portion 129a on the right side (driver's seat 6 side) of the intermediate portion in the length direction (front-rear direction) of the first portion 129a, and extends in the front-rear direction. The length of the second portion 129b in the anteroposterior direction is shorter than the length of the first portion 129a in the anteroposterior direction. The lower end of the second portion 129b is connected to the upper surface of the left frame portion 128b of the lower plate 128, extends upward, then curves and extends to the left, and is connected to the first portion 129a. The second portion 129b has a second end portion arranged at an end portion on the strut side at a distance from the strut. The second end portion is provided on the side of the second strut 122 and is arranged at a distance from the second strut 122, and the second end portion is provided on the side of the third strut 123 and is spaced from the third strut 123. It has a second rear end portion 129f arranged so as to be open.

As shown in FIGS. 23 and 25, the first reinforcing member 131 has a first plate portion 131a and a second plate portion 131b. The first plate portion 131a is arranged so that one surface faces downward and the other surface faces upward. The first plate portion 131a is attached to the upper surface of the lower plate 128. The first plate portion 131a and the second plate portion 131b may be formed by bending or bending one plate member, or may be formed by joining different plate members by welding or the like. ..

The second plate portion 131b is a plate material that stands up from the other side (left side) of the first plate portion 131a in the body width direction, with one surface facing the other side (left side) in the body width direction and the other surface. It is arranged toward one side (right side) in the width direction of the aircraft. The second plate portion 131b is stretched in a direction (front-back direction) intersecting the stretching direction of the support column, and one end side (front side) of the stretching direction is connected to the support column (second support column 122, third support column 123). There is. The second plate portion 131b has a first reinforcing portion 131c and a second reinforcing portion 131d.

The first reinforcing portion 131c is provided in the front portion (tilted plate portion 131f, which will be described later) of the second plate portion 131b, and is welded to the second support column 122. The first reinforcing portion 131c has a first portion 131c1 and a second portion 131c2. The first portion 131c is provided on the upper edge of the front portion of the second plate portion 131b, and is welded to the right surface (one surface in the width direction of the machine body) of the second support column 122. The second portion 131c2 is provided on the front left surface of the second plate portion 131b and is welded to the trailing edge of the second support column 122. In FIG. 25, since the second portion 131c2 is in a hidden position (the back side of the drawing), the welded range is indicated by an arrow. A weld bead BE1 is shown in the first portion 131c1.

The second reinforcing portion 131d is in contact with the second reinforcing member 129 and is welded. The second reinforcing portion 131d has a first portion 131d1 and a second portion 131d2. The first portion 131d1 is provided at the rear portion of the second plate portion 131b so as to project rearward from the first plate portion 131a, and is welded to the upper surface front portion of the second portion 129b of the second reinforcing member 129. The second portion 131d2 is provided on the left surface of the second plate portion 131b and is welded to the right edge of the first portion 129a of the second reinforcing member 129. In FIG. 25, since the second portion 131d2 is in a hidden position (the back side of the drawing), the welded range is indicated by an arrow. The weld bead BE2 is shown in the first portion 131d1. As described above, the other end side (rear side) of the second plate portion 131b in the stretching direction is connected (welded) to the second reinforcing member 129.

The first plate portion 131a has a third reinforcing portion 131e. The third reinforcing portion 131e has a first portion 131e1 and a second portion 131e2. The first portion 131e1 is provided on the front right edge of the first plate portion 131a and is welded to the upper surface of the front frame portion 128a of the lower plate 128. The second portion 131e2 is provided on the right edge and the trailing edge of the first plate portion 131a behind the first portion 131e1 and is welded to the upper surface of the left frame portion 128b of the lower plate 128. In FIG. 25, the first portion 131e1 shows the weld bead BE3, and the second portion 131e2 shows the weld bead BE4. The weld bead BE3 and the weld bead BE4 are continuously provided.

As described above, the first reinforcing member 131 has a first reinforcing portion 131c, a second reinforcing portion 131d, and a third reinforcing portion 131e. Therefore, even when the work machine 1 swings back and forth, stress concentration on the connection portion between the cabin 5 and the machine body 2 is less likely to occur, and the strength of the cabin 5 is improved.
As shown in FIGS. 23 and 25, the second plate portion 131b has an inclined plate portion 131f and a low plate portion 131g. The inclined plate portion 131f is provided in the front portion of the second plate portion 131b. The inclined plate portion 131f is substantially higher in the side view so as to gradually increase from the other end side (second reinforcing portion 131d side) in the stretching direction toward one end side (first reinforcing portion 131c side) in the stretching direction. It is formed in a triangular shape. The inclined plate portion 131f is provided with a first reinforcing portion 131c. Specifically, the first reinforcing portion 131c is provided along the edge portion of the inclined plate portion 131f. By providing the inclined plate portion 131f, the length of the first reinforcing portion 131c (the length of the weld bead BE1) can be extended, and the connection strength can be improved. The low plate portion 131g is a portion having a height lower than that of the inclined plate portion 131f, and is provided behind the inclined plate portion 131f (on the side of the second reinforcing portion 131d).

As shown in FIG. 23, the second plate portion 131b has a first contact portion 131h. The first contact portion 131h is provided at the rear portion of the second plate portion 131b, and is in contact with and is connected to the second front end portion 129e of the second reinforcing member 129. The first plate portion 131a has a second contact portion 131i. The second contact portion 131i is provided at the rear portion of the first plate portion 131a, and is in contact with the second front end portion 129e of the second reinforcing member 129. That is, the second plate portion 131b and the first plate portion 131a are both in contact with the second front end portion 129e of the second reinforcing member 129. The second reinforcing portion 131d extends rearward (toward the second reinforcing member 129 side) with respect to the first contact portion 131h and the second contact portion 131i.

As shown in FIG. 23, the positions of the first contact portion 131h and the second contact portion 131i along the one end side to the other end side in the stretching direction are between two fixed portions 133a and 133b adjacent to each other. The position of. The strength of the cabin 5 is increased by fixing the lower plate 128 to the machine body 2 with bolts at the fixing portions 133a and 133b. Therefore, the first contact portion 131h and the second contact portion 131i, which are the portions where the second reinforcing member 129 and the first reinforcing member 131 are brought into contact with each other and welded, are attached to the two adjacent fixing portions 133a and 133b. By providing the cabin 5 in between, high strength can be obtained.

As shown in FIG. 26, the third reinforcing member 132 is formed of a plate material, and one surface is directed to the other side (left side) in the body width direction and the other surface is directed to one side (right side) in the body width direction. Is arranged. The third reinforcing member 132 has a first reinforcing portion 132a, a second reinforcing portion 132b, and a third reinforcing portion 132c. The first reinforcing portion 132a is provided at the rear portion of the third reinforcing member 132, and is welded in contact with the side surface (left surface) of the third support column 123. The second reinforcing member 132b is provided at the front portion of the third reinforcing member 132, and is welded in contact with the upper surface of the second reinforcing member 129. The third reinforcing portion 132c is provided on the lower edge of the third reinforcing member 132, and is welded in contact with the upper surface of the left frame portion 128b of the lower plate 128.

As described above, the third reinforcing member 132 has the first reinforcing portion 132a, the second reinforcing portion 132b, and the third reinforcing portion 132c. Therefore, even when the work machine 1 swings back and forth, stress concentration on the connection portion between the cabin 5 and the machine body 2 is less likely to occur, and the strength of the cabin 5 is improved.
Further, the third reinforcing member 132 has a third contact portion 132d. The third contact portion 132d is provided at the front portion of the third reinforcing member 132, and is in contact with the second rear end portion 129f of the second reinforcing member 129. The second reinforcing portion 132b extends forward from the third contact portion 132d.

In the present embodiment, the second reinforcing member 129 and the reinforcing member 130 (the first reinforcing member 131 and the third reinforcing member 132) are provided by being connected to the upper surface of the left frame portion 128b of the lower plate 128. The second reinforcing member 129 and the reinforcing member 130 may be provided by connecting to the upper surface of another portion (right frame portion, front frame portion, rear frame portion) of the lower plate 128.
As shown in FIGS. 17 and 18, a floor mat 134 is placed above the step 20. The floor mat 134 is arranged in front of the support base 75 that supports the driver's seat 6. A plurality of protrusions 134g for preventing slipping are provided on the upper surface of the floor mat 134. The floor mat 134 has a substantially rectangular shape in a plan view and has four edges (outer edges). The four edges are a front edge 134a, a left edge 134b, a right edge 134c, and a trailing edge 134d. The front edge portion 134a is arranged above the front frame portion 128a. The left edge portion 134b is arranged above the left frame portion 128b. The right edge portion 134c is arranged above the right frame portion 128c. The trailing edge portion 134d is arranged in front of the rear frame portion 128d. In the present embodiment, the floor mat 134 is composed of two sheets, a front portion 134A and a rear portion 134B, but may be composed of one or three or more sheets.

As shown in FIG. 18, a first notch 134e is provided at the front of the left edge 134b, and a second notch 134f is provided at the rear of the left edge 134b. As shown in FIG. 27, the left edge portion 134b is in contact with the side surface (right surface) of the second plate portion 131b of the first reinforcing member 131 in the first notch portion 134e. As shown in FIG. 28, the left edge portion 134b is in contact with the side surface (right surface) of the third reinforcing member 132 at the second notch portion 134f. The intermediate portion of the left edge portion 134b (the portion between the first notch portion 134e and the second notch portion 134f) is placed on the upper surface of the first portion 129a of the second reinforcing member 129.

The floor mat 134 has an inclined surface that rises from the inside of the floor mat 134 toward the edge portion (outer edge portion). The inclined surface includes a first inclined surface 134h and a second inclined surface 134i. As shown in FIG. 27, the first inclined surface 134h is an inclined surface that rises from the inside toward the first cutout portion 134e of the left edge portion 134b. The first inclined surface 134h is formed in an L shape in a plan view along the first notch portion 134e. As shown in FIG. 28, the second inclined surface 134i is an inclined surface that rises from the inside of the floor mat 134 toward the second cutout portion 134f of the left edge portion 134b. The second inclined surface 134i is formed in an L shape in a plan view along the second notch portion 134f.

The upper edge of the first inclined surface 134h is arranged at the same height as the upper edge of the low plate portion 131g. The upper edge of the second inclined surface 134i is arranged at the same height as the upper edge of the low plate portion 131g. As a result, when the earth and sand accumulated on the floor mat 134 are swept out from the entrance / exit 5a, they can be swept out from the first inclined surface 134h and the second inclined surface 134i beyond the low plate portion 131 g. Therefore, it becomes easy to sweep out the earth and sand, and it is possible to prevent contamination of the flood control equipment due to the earth and sand accumulated on the floor mat 134. Further, since the edge portion of the floor mat 134 fits well, a good appearance can be obtained. In the present embodiment, the first inclined surface 134h and the second inclined surface 134i are provided in order to make the upper edge of the floor mat 134 at the same height as the upper edge of the low plate portion 131 g, but the present invention is not limited to this. For example, the height of the upper surface of substantially the entire area of the floor mat 134 (the portion excluding the plurality of convex portions 134g for preventing slipping) may be set to the same height as the upper edge of the low plate portion 131g.
<Unload lever>
As shown in FIGS. 17, 18, and 29, a control box 135L is provided on one side (left side) of the driver's seat 6. A control box 135R is provided on the other side (right side) of the driver's seat 6.

A duct 98 having an air conditioner outlet is provided in front of the control box 135R. An operation lever 101R and an armrest 136R are attached to the upper part of the control box 135R. A bellows member 107R is attached to the front portion of the upper surface of the control box 135R. The operating lever 101R projects upward from the bellows member 107R and extends upward. The operating lever 101R shifts forward and inward (toward the driver's seat 6) as it extends upward. A dozer lever 102 is attached to the side (right side) of the control box 135R. The armrest 136R extends upward from the rear of the upper surface of the control box 135R, and then curves and extends rearward. The upper surface 136Ra of the armrest 136R is an inclined surface that goes downward as it goes forward.

An operation lever 101L and an armrest 136L are attached to the upper part of the control box 135L. A bellows member 107L is attached to the front portion of the upper surface of the control box 135L. The operating lever 101L projects upward from the bellows member 107L and extends upward. The operating lever 101L moves forward and inward (toward the driver's seat) as it extends upward. The armrest 136L extends upward from the rear part of the upper surface of the control box 135L, and then curves and extends rearward. The upper surface 136La of the armrest 136L is an inclined surface that goes downward as it goes forward.

An unload lever 137 is attached to the control box 135L. The unload lever 137 is supported by the control box 135L so as to be swingable upward and downward. The unload lever 137 can operate whether or not to supply hydraulic oil to the hydraulic equipment. When the unload lever 137 is swung downward, the supply of hydraulic oil to the flood control equipment is allowed. When the unload lever 137 is swung upward, the supply of hydraulic oil to the hydraulic equipment is cut off, and it becomes impossible to drive the work device 4 and the like. 17, 18, and 29 show a state in which the unload lever 137 is swung downward (hereinafter, referred to as a downward swing state). Hereinafter, the position of the unload lever 137 in this downward swing state will be described.

As shown in FIG. 17, the unload lever 137 extends forward and downward from the front portion of the control box 135L, and then bends and extends forward and upward in the side view. Further, as shown in FIG. 18, in a plan view, the unload lever 137 extends forward from the front portion of the control box 135L, then bends forward and extends forward and inward of the cabin (toward the driver's seat 6). There is.

As shown in FIG. 18, the front end portion 137a of the unload lever 137 is located on one side (left side) of the operation pedal (SP pedal) 105. Specifically, the front end portion 137a of the unload lever 137 connects the end portion 105a on one side (left side) of the operation pedal (SP pedal) 105 and the end portion on one side (left side) in the driver's seat 6. It is located on one side (left side) of the straight line L7. Note that FIG. 18 shows a straight line connecting the end 105a and the left front corner 6b of the driver's seat 6 as a straight line L7 connecting the end 105a and the one side (left side) end of the driver's seat 6. There is. Further, as shown in FIGS. 17 and 29, the upper end portion 137b of the unload lever 137 is located above the upper surface front end portion 135La of the control box 135L, and is the central portion in the width direction of the seat surface of the driver's seat 6. It is located above the height of 6a. Further, the upper end portion 137b of the unload lever 137 is located on the extension line L8 which extends the upper surface 136La of the armrest 136L forward.

With the above-described configuration, the position of the unload lever 137 in the downward swing state is a position away from the driver's seat 6. Therefore, as shown by the virtual line (dashed line) in FIG. 29, even when the worker H seated in the driver's seat 6 is tall, the left knee of the worker H is set to the unload lever 137 in the downward swinging state. There is no risk of contact. Further, the operation of the operation pedal (SP pedal) 105 by the left foot of the operator H is not hindered by the unload lever 137.
<Relay plate>
As shown in FIGS. 16 and 30 to 33, the relay plate 110 is fixed to the lower surface of the step 20. The relay plate 110 relays a pilot hose that connects the pilot valve and the first control valve 11. In other words, the pilot hose connects the pilot valve and the first control valve 11 via the relay plate 110.

The type and number of pilot hoses relayed by the relay plate 110 are not limited, but in the present embodiment, the relay plate 110 relays three pilot hoses. Hereinafter, for convenience, the three pilot hoses will be referred to as a first pilot hose, a second pilot hose, and a third pilot hose.
The first pilot hose is a pilot hose that relays and connects the pilot valve for the dozer and the first control valve V13 for the dozer with the relay plate 110. As shown in FIG. 33, the first pilot hose is the first hose 114 that connects the pilot valve for the dozer and the relay plate 110, and the first hose that connects the relay plate 110 and the first control valve V13 for the dozer. It has a downstream hose 115.

The second pilot hose is a pilot hose that relays and connects the pilot valve for the dozer and the second control valve V9 for the dozer with the relay plate 110. As shown in FIG. 33, the second pilot hose connects the second upstream hose 116 that connects the pilot valve for the dozer and the relay plate 110, and the second hose that connects the relay plate 110 and the second control valve V9 for the dozer. It has a downstream hose 117.

The third pilot hose is a pilot hose that connects the swivel / arm pilot valve and the arm control valve V7 by relaying them with the relay plate 110. As shown in FIG. 33, the third pilot hose is a third upstream hose 118 that connects the swivel / arm pilot valve and the relay plate 110, and a third that connects the relay plate 110 and the arm control valve V7. It has a downstream hose 119.

The first upstream hose 114 and the second upstream hose 116 extend downward from the dozer pilot valve connected to the dozer lever 102 and pass through an opening 20b provided in the right rear portion of step 20 as shown in FIG. Is guided below step 20. The third upstream hose 118 extends downward from the swivel / arm pilot valve connected to the operating lever 101L, and is guided below step 20 through the opening 20c provided at the left rear portion of step 20. ..

The relay plate 110 is arranged so that one side faces the right side (one side in the body width direction) and the other side faces the left side (the other side in the body width direction). The relay plate 110 is a substantially rectangular plate, and is arranged with the longitudinal direction facing the front-rear direction. Fixing members 109 are attached to the front end and the rear end of the relay plate 110, respectively. The fixing member 109 extends in the vertical direction, and the upper end portion thereof is fixed to the lower surface of the step 20. As a result, the relay plate 110 is fixed to the lower surface of the step 20.

A plurality of pipe joints are attached to the rear portion of the relay plate 110. Each pipe joint connects two hoses so that they can communicate with each other. As shown in FIGS. 30 to 32, in this embodiment, three pipe joints (first pipe joint 111, second pipe joint 112, third pipe joint 113) are attached. The first pipe joint 111 is arranged at the rear upper part of the relay plate 110. The second pipe joint 112 is arranged below the first pipe joint 111. The third pipe joint 113 is arranged in front of the second pipe joint 112. The first pipe joint 111, the second pipe joint 112, and the third pipe joint 113 have a cylindrical shape, and are fitted and welded so as to penetrate a hole provided in the relay plate 110, whereby the relay plate 110 Is integrally connected with.

Conventionally, since the hose is fixed to the relay plate 110 with a nut, it takes time to assemble the hose, but according to the present embodiment, the pipe joints (first pipe joint 111, second pipe joint 112, Since the third pipe joint 113) is integrally connected to the relay plate 110, the hose can be easily assembled.
The first pipe joint 111, the second pipe joint 112, and the third pipe joint 113 project to both sides (from one surface and the other surface) of the relay plate 110. That is, the first pipe joint 111 has a protruding portion 111a protruding from one surface of the relay plate 110 and a protruding portion 111b protruding from the other surface of the relay plate 110. The second pipe joint 112 has a protruding portion 112a protruding from one surface of the relay plate 110 and a protruding portion 112b protruding from the other surface of the relay plate 110. The third pipe joint 113 has a protruding portion 113a protruding from one surface of the relay plate 110 and a protruding portion 113b protruding from the other surface of the relay plate 110.

As shown in FIG. 30, the protruding length of the protruding portion 111a of the first pipe joint 111 from the relay plate 110 is L1, and the protruding length of the protruding portion 112a of the second pipe joint 112 from the relay plate 110 is L2. Assuming that the protruding length of the protruding portion 113a of the three pipe joint 113 from the relay plate 110 is L3, L1 = L3> L2. Further, the protruding length of the protruding portion 111b of the first pipe joint 111 from the relay plate 110 is L4, the protruding length of the protruding portion 112b of the second pipe joint 112 from the relay plate 110 is L5, and the third pipe joint 113. Assuming that the protruding length of the protruding portion 113b from the relay plate 110 is L6, L4 = L6 <L5. Further, in the present embodiment, L1 + L4 = L2 + L5 = L3 + L6, and common parts are used as the first pipe joint 111, the second pipe joint 112, and the third pipe joint 113 to reduce the types of parts and reduce the cost. I am trying.

The first upstream hose 114 and the first downstream hose 115 described above are connected to the first pipe joint 111. Specifically, the first upstream hose 114 is connected to the protruding portion 111a, and the first downstream hose 115 is connected to the protruding portion 111b.
The second upstream hose 116 and the second downstream hose 117 described above are connected to the second pipe joint 112. Specifically, the second upstream hose 116 is connected to the protruding portion 112a, and the second downstream hose 117 is connected to the protruding portion 112b.

The third upstream hose 118 and the third downstream hose 119 described above are connected to the third pipe joint 113. Specifically, the third upstream hose 118 is connected to the protruding portion 113a, and the third downstream hose 119 is connected to the protruding portion 113b.
Here, as described above, the plurality of pipe joints (first pipe joint 111, second pipe joint 112, third pipe joint 113) attached to the relay plate 110 have protrusion lengths in the same direction from the relay plate 110. Includes fittings of different sizes. That is, at least a part of the plurality of pipe joints has different protrusion lengths in the same direction from the relay plate 110. Therefore, the hose can be easily connected (assembled) to the pipe joint. Specifically, since the protruding length L1 of the protruding portion 111a protruding from one surface of the relay plate 110 and the protruding length L2 of the protruding portion 112a are different, the first upstream hose 114 and the second upstream hose 116 When connecting to, it becomes difficult for them to interfere with each other, and the connection becomes easy. Further, since the protruding length L3 of the protruding portion 113a and the protruding length L2 of the protruding portion 112a are different, they are less likely to interfere with each other when connecting the third upstream hose 118 and the second upstream hose 116, and the connection is made. Becomes easier. Further, since the protrusion length L4 of the protrusion 111b protruding from the other surface of the relay plate 110 and the protrusion length L5 of the protrusion 112b are different, the first downstream hose 115 and the second downstream hose 117 are connected. When doing so, they are less likely to interfere with each other, facilitating connection. Further, since the protruding length L6 of the protruding portion 113b and the protruding length L5 of the protruding portion 112b are different, they are less likely to interfere with each other when connecting the third downstream hose 119 and the second downstream hose 117, and the connection is made. Becomes easier.

As shown in FIG. 30, step 20 has an inner edge portion forming an inspection port 20d. The first pipe joint 111 is arranged below the inspection port 20d or below the vicinity of the inspection port 20d. The second pipe joint 112 is arranged below the first pipe joint 111. The third pipe joint 113 is arranged directly below the inspection port 20d. The inspection port 20d is provided in front of the support base 75 that supports the driver's seat 6. The inspection port 20d is closed from the upper surface side of the step 20 by the removable lid 20e. By removing the lid 20e, the operator accesses the pipe joint (first pipe joint 111, second pipe joint 112, third pipe joint 113) from above step 20 via the inspection port 20d, and the pipe joint A hose can be connected to. Here, the second pipe joint 112 is below the first pipe joint 111, but the protrusion length is different from that of the first pipe joint 111. Specifically, the protruding length L5 of the protruding portion 112b of the second pipe joint 112 is longer than the protruding length L4 of the protruding portion 111b of the first pipe joint 111. Therefore, the hose can be easily connected to the second pipe joint 112 without being disturbed by the first pipe joint 111.
<Weight>
As shown in FIG. 34, the first weight 10 provided at the rear portion of the machine body 2 has a plurality of recesses on the surface (rear surface) opposite to the body body 2. The recesses include first recesses 141L, 141R, second recesses 142L, 142R, third recesses 143, fourth recesses 144, and fifth recesses 145L, 145R. Each recess is recessed toward the machine body 2 (toward the front).

The first recesses 141L and 141R are provided at symmetrical positions with the center in the width direction of the machine body interposed therebetween. One first recess 141L is provided on one side (left side) in the width direction of the machine body. The other first recess 141R is provided on the other side (right side) in the width direction of the machine body. The first recesses 141L and 141R are located below the center of the first weight 10 in the vertical direction. As shown in FIG. 38, the first recesses 141L and 141R are formed in a truncated cone shape in which the diameter gradually decreases from the rear to the front.

A first fixing portion 146 is provided in the first recesses 141L and 141R. The first fixing portion 146 is a portion fixed to the machine body 2. The first fixing portion 146 has an insertion portion 147 provided in the first recess 141 and a fastener (bolt) 148 inserted through the insertion portion 147. The insertion portion 147 is provided at the bottom (front portion) of the truncated cone-shaped first recess 141, and penetrates the bottom portion in the front-rear direction. The fastener 148 is inserted through the insertion portion 147 and fastened to the screw hole provided in the machine body 2. As a result, the first fixing portion 146 is fixed to the machine body 2.

The second recesses 142L and 142R are provided at symmetrical positions with the center in the width direction of the machine body interposed therebetween. One second recess 142L is provided on one side (left side) in the width direction of the machine body. The second recess 142L is recessed shallower than the first recess 141L, and is adjacent to the other side (right side) of the first recess 141L in the body width direction. The other second recess 142R is provided on the other side (right side) in the width direction of the machine body. The second recess 142R is recessed shallower than the first recess 141R, and is adjacent to one side (left side) of the first recess 141R in the body width direction. The second recesses 142L and 142R are located below the center of the first weight 10 in the vertical direction. The second recesses 142L and 142R are provided with screw holes 152 toward the front.

The third recess 143 is provided at the center in the width direction of the machine body. The third recess 143 is located substantially at the center of the first weight 10 in the vertical direction. A third fixing portion 151 is provided in the third recess 143. The third fixing portion 151 is a portion fixed to the machine body 2. A fastener (bolt) 150 is inserted into the third fixing portion 151, and the fastener 150 is fastened to a screw hole provided in the machine body 2. As a result, the third fixing portion 151 is fixed to the machine body 2. In the present embodiment, the first weight 10 is fixed to the machine body 2 by two first fixing portions 146 and one third fixing portion 151.

The fourth recess 144 is provided at the center in the width direction of the machine body. The fourth recess 144 is located above the third recess 143. The fourth recess 144 is provided with a screw hole 154 toward the front.
The fifth recesses 145L and 145R are provided at symmetrical positions with respect to the center in the width direction of the machine body, and are recessed toward the front. One fifth recess 145L is provided on one side (left side) in the width direction of the machine body. The other fifth recess 145R is provided on the other side (right side) in the width direction of the machine body. The fifth recesses 145L and 145R are located above the center of the first weight 10 in the vertical direction. The shapes of the fifth recesses 145L and 145R are substantially parallelograms in which the horizontal direction (body width direction) is longer than the vertical direction (vertical direction) in the rear view.

Reflective materials 153L and 153R that reflect light are attached to the bottom surfaces of the fifth recesses 145L and 145R for the purpose of improving visibility at night. The reflective materials 153L and 153R are attached to the surface (rear surface) of the first weight 10 opposite to the body 2. In the present embodiment, the reflectors 153L and 153R are reflector labels and are attached to the bottom surfaces of the fifth recesses 145L and 145R. In rear view, the shape of the reflector 153L substantially matches the shape of the fifth recess 145L, and the shape of the reflector 153R substantially matches the shape of the fifth recess 145R.

The first weight 10 has a substantially quadrangular inner edge portion forming the intake ports 140L and 140R. The intake ports 140L and 140R are openings for taking in outside air inside the machine body 2. The intake ports 140L and 140R are provided at symmetrical positions with the center in the width direction of the airframe in between. The intake port 140L is located on the other side (left side) in the body width direction with respect to the fourth recess 144. The intake port 140R is located on the other side (right side) in the body width direction with respect to the fourth recess 144.

As shown in FIG. 38, the rear surface 10R of the first weight 10 is curved so as to move forward toward the outside of the airframe in a plan view.
In the present embodiment, the second weight 100 can be attached to the rear part of the first weight 10. That is, as shown in FIGS. 37 and 38, a second weight 100 can be attached to the rear portion of the machine body 2 in addition to the first weight 10.

The second weight 100 has a first surface (front surface) 100F provided on the first weight 10 side and a second surface (rear surface) 100R opposite to the first surface 100F. The first surface 100F is curved so as to substantially follow the rear surface of the first weight 10. The second surface 100R is curved substantially parallel to the first surface 100F.
Hereinafter, the configuration of the second weight 100 will be described with reference to a state in which the second weight 100 is attached to the machine body 2 together with the first weight 10 (states of FIGS. 37 and 38).

As shown in FIGS. 35 and 36, the second weight 100 has a shape in which two corners of a rectangle are cut out when viewed from the rear. In other words, the second weight 100 has two notches 155L and 155R. The cutout portions 155L and 155R are provided at symmetrical positions with the center in the width direction of the machine body interposed therebetween. One notch portion 155L is provided in the upper part on one side (left side) in the width direction of the machine body. The other notch 155R is provided in the upper part on the other side (right side) in the width direction of the machine body.

The second weight 100 has a central portion 100a, a first extending portion 100b, and a second extending portion 100c. The central portion 100a is located between one notch 155L and the other notch 155R. The first extending portion 100b is located below the notch portion 155L. The second extending portion 100c is located below the notch portion 155R.
The central portion 100a is a portion arranged near the center in the width direction of the machine body, and is formed in a substantially trapezoidal shape in which the upper side is longer than the lower side when viewed from the rear. The length of the central portion 100a in the vertical direction (vertical direction) is formed to be substantially equal to the length of the first weight 10 in the vertical direction. The length of the central portion 100a in the lateral direction (in the width direction of the machine body) is formed to be shorter than the length in the lateral direction of the first weight 10. Specifically, the lateral length of the central portion 100a is formed to be shorter than the distance between the reflector 153L and the reflector 153R. In other words, the distance between the notch 155L and the notch 155R in the width direction of the machine body is formed to be shorter than the distance between the reflector 153L and the reflector 153R. Further, the lower edge of the notch portion 155L and the lower edge of the notch portion 155R are located below the reflectors 153L and 153R. As a result, when the second weight 100 is fixed to the first weight 10, the reflector 153L is exposed from the notch 155L, and the reflector 153R is exposed from the notch 155R. Thereby, when the second weight 100 is fixed to the first weight 10, it is possible to prevent the reflectors 153L and 153R from being covered. Therefore, it is not necessary to attach another reflective material to the second weight 100. Further, even when the second weight 100 is attached, it is possible to prevent the reflective materials 153L and 153R of the first weight 10 and the designability of the peripheral portion thereof from being impaired.

Further, the distance between the notch portion 155L and the notch portion 155R in the width direction of the machine body is formed to be shorter than the distance between the intake port 140L and the intake port 140R. Further, the lower edge of the notch portion 155L and the lower edge of the notch portion 155R are located below the intake ports 140L and 140R. As a result, when the second weight 100 is fixed to the first weight 10, the intake port 140L is exposed from the notch portion 155L, and the intake port 140R is exposed from the notch portion 155R. Therefore, the attachment of the second weight 100 does not hinder the intake of outside air from the intake ports 140L and 140R into the body 2.

The central portion 100a has a second fixing portion 157U and a protruding portion 161U.
The second fixing portion 157U is a portion fixed to the first weight 10 together with the second fixing portions 157L and 157R described later. The second fixed portion 157U is provided at the center of the second weight 100 in the width direction of the machine body, and is located above the first extending portion 100b and the second extending portion 100c. The second fixing portion 157U is recessed on the second surface (rear surface) 100R side and protrudes on the first surface (front surface) 100F side. A through hole is formed in the second fixing portion 157U, and a fastener (bolt) is inserted into the through hole, and the screw portion of the fastener is screwed into the screw hole 154 formed in the fourth recess 144. .. As a result, the second fixing portion 157U is fixed to the fourth recess 144 of the first weight 10.

The protruding portion 161U is provided below the second fixed portion 157U, and protrudes in a truncated cone shape on the first surface (front surface) 100F side. In a state where the second weight 100 is fixed to the first weight 10, the protruding portion 161U protrudes into the third recess 143.
The central portion 100a has mounting portions 156L and 156R for mounting the hanging bolts. The mounting portion 156L is provided in the upper left portion of the central portion 100a. The mounting portion 156R is provided in the upper right portion of the central portion 100a. The mounting portions 156L and 156R are formed to be thicker than the other portions of the central portion 100a. Screw holes for screwing the screw portions of the hanging bolts are provided on the upper portions of the mounting portions 156L and 156R.

The first extending portion 100b extends from the lower left portion of the central portion 100a to the left. The first extending portion 100b has a thin-walled portion 100d at the lower left. A protruding portion 161L is provided on the front surface of the thin-walled portion 100d. As shown in FIG. 36, the protruding portion 161L protrudes from the first surface (front surface) 100F in a truncated cone shape. As shown in FIG. 38, in a state where the second weight 100 is fixed to the first weight 10, the protruding portion 161L projects from the first surface (front surface) 100F into the first recess 141L. A second fixing portion 157L and a mounting portion 158L, which will be described later, are provided on the rear surface of the thin-walled portion 100d. The second fixing portion 157L and the mounting portion 158L are lined up at intervals in the width direction of the machine body. Specifically, the second fixing portion 157L is located on the inside of the machine body (right side), and the mounting part 158L is located on the outside side of the machine body (left side).

The second extending portion 100c extends from the lower right portion of the central portion 100a to the right. The second extending portion 100c has a thin-walled portion 100e at the lower right portion. A protruding portion 161R is provided on the front surface of the thin-walled portion 100e. As shown in FIG. 36, the protruding portion 161R protrudes from the first surface (front surface) in a truncated cone shape. As shown in FIG. 38, in a state where the second weight 100 is fixed to the first weight 10, the protruding portion 161R projects from the first surface (front surface) into the first recess 141R. A second fixing portion 157R and a mounting portion 158R, which will be described later, are provided on the rear surface of the thin-walled portion 100e. The second fixing portion 157R and the mounting portion 158R are lined up at intervals in the width direction of the machine body. Specifically, the second fixing portion 157R is located on the inside of the machine body (left side), and the mounting part 158R is located on the outside side of the machine body (right side).

Labels 159 are affixed between the fixing portion 157L and the mounting portion 158L of the first extending portion 100b and between the fixing portion 157R and the mounting portion 158R of the second extending portion 100c, respectively. Label 159 is, for example, a label containing a reflective material that reflects light.
The second fixing portion 157L of the first extending portion 100b and the second fixing portion 157R of the second extending portion 100c are recessed on the second surface (rear surface) 100R side and on the first surface (front surface) 100F side. It is protruding. Through holes are formed in the second fixing portions 157L and 157R. As shown in FIG. 38, the fastener (bolt) 164 is inserted into the through hole formed in the second fixing portion 157L, and the screw portion of the fastener 164 is screwed into the screw hole 152 formed in the second recess 142L. To do. Further, the fastener (bolt) 165 is inserted into the through hole formed in the second fixing portion 157R, and the screw portion of the fastener 165 is screwed into the screw hole 152 formed in the second recess 142R. As a result, the second fixing portions 157L and 157R are fixed to the second recesses 142L and 142R of the first weight 10.

The attachment portions 158L and 158R are portions to which accessories can be attached as needed, and are provided on the second surface (rear surface) 100R. The mounting portion 158L is provided at a position corresponding to the protruding portion 161L of the second surface 100R. The mounting portion 158R is provided at a position corresponding to the protruding portion 161R of the second surface 100R. The accessory is, for example, a hanging metal fitting such as a tie-down hook. The mounting portions 158L and 158R have screw holes 160 into which screw portions of accessories such as tie-down hooks can be screwed. The screw hole 160 provided in the mounting portion 158L is provided from the second surface (rear surface) 100R side toward the protruding portion 161L, and reaches the inside of the protruding portion 161L. The screw hole 160 provided in the mounting portion 158R is provided from the second surface (rear surface) 100R side toward the protruding portion 161R, and reaches the inside of the protruding portion 161R.

Here, since the projecting portions 161L and 161R project into the first recesses 141L and 141R, the thickness of the portion provided with the mounting portions 158L and 158R can be locally thickened. Therefore, it is possible to secure a sufficient length of the screw hole 160 and improve the strength of the mounting portions 158L and 158R. As a result, the accessory can be attached to the second weight 100 without increasing the overall thickness of the second weight 100 or projecting a part of the second weight 100 rearward from the second surface side. Structure can be obtained. Therefore, it is possible to suppress an increase in the outer shape of the work machine 1 when the second weight 100 is attached, suppress an increase in the radius of the rear end of the work machine 1, and prevent the design from being impaired. It becomes.
<Effect>
In the working machine 1 of the present embodiment, the refueling switch 42 is provided above the fuel tank 23 and at the first position in the horizontal direction with respect to the first control valve 11, and the control device of the refueling pump 40 different from the refueling switch 42 ( By providing the relay) 43 at a second position different from above the fuel tank 42, a relatively wide space can be secured above the fuel tank 23. Therefore, the first control valve 11 provided above the fuel tank 23 can be extended in the horizontal direction, and the size of the first control valve 11 can be increased due to a change in the specifications of the work machine 1. ..

Further, since the refueling switch 42 is provided at a position closer to the outer edge of the machine body 2 in the horizontal direction than the first control valve 11, the refueling switch 42 is arranged at a position easily accessible to the operator.
Further, by providing the first bracket 41 to which the refueling pump 40 and the control device 43 are attached, the number of parts can be reduced as compared with the case where the refueling pump 40 and the control device 43 are attached to separate brackets. At the same time, the installation space of the refueling pump 40 and the control device 43 can be reduced.

Further, a hose 44 having one end side 44a connected to the suction portion 40a of the refueling pump 40 and a storage portion 45 for accommodating the other end side 44b of the hose 44 are provided, and the refueling switch 42 is located near the storage portion 45. By providing the hose 44, the refueling switch 42 can be easily recognized when the hose 44 is taken out from the storage portion 45 when the operator replenishes the fuel tank 23 with fuel.

Further, the control device 43 is provided on the center side of the machine body 2 with respect to the fuel tank 23, and the center cover 30 covering the upper part of the control device 43 is provided, so that the control device 43 is damaged by rain, earth and sand, or the like. Can be prevented.
Further, by providing the blazer pipe 59 communicating with the inside of the fuel tank 23 and the second bracket 46 to which the blazer pipe 59 and the refueling switch 42 are fixed and mounted on the fuel tank 23, the blazer pipe 59 is provided. There is no need for a dedicated bracket to attach the. Therefore, the space required for installing the blazer pipe 59 is reduced, and the number of parts can be reduced.

Further, the fuel tank 23 is arranged on one side in the width direction of the airframe 2, and has a refueling unit 48 in front of the first control valve 11, and the second bracket 46 has a first control valve on one surface. A first plate 46a arranged on the 11 side and the other surface arranged on the refueling portion 48 side, a second plate 46b bent rearward from the upper end portion of the first plate 46a, and an airframe 2 of the first plate 46a. It has a third plate 46c that is bent rearward from one end in the width direction to be connected to the second plate 46b and to which a refueling switch 42 is attached. As a result, the second bracket 46 can be arranged in a space-saving manner without interfering with the first control valve 11 and the refueling unit 48. In addition, access to the refueling switch 42 becomes easy. Further, by connecting the second plate 46b and the third plate 46c, the strength of the second bracket 46 can be increased.

Further, the first plate 46a has a first notch 46d in the upper part on the other side of the body 2 in the width direction and a second notch 46e in the lower part on one side in the width direction of the machine 2. Therefore, it is possible to prevent the second bracket 46 from interfering with other members (blazer pipe 59, return pipe 57, etc.).
Further, the hydraulic oil tank 22 for storing the hydraulic oil supplied to the flood control equipment and the second control in which a plurality of valves for controlling the supply of the hydraulic oil to the first control valve 11 are integrated and attached to the hydraulic oil tank 22. A valve 12 and hydraulic hoses 61, 62, 63, 64 connecting the first control valve 11 and the second control valve 12 are provided, and the second control valve 12 has a plurality of hydraulic pressures on the opposite side of the hydraulic oil tank 23. The hoses 61, 62, 63, 64 have connection portions 12Aa, 12Ba, 12Ca, 12Da, and the connection portions are provided side by side in the vertical direction. As a result, the hydraulic hoses 61, 62, 63, 64 connected to the connecting portions 12Aa, 12Ba, 12Ca, and 12Da can be extended in the same direction without interfering with each other. Therefore, the space occupied by the hydraulic hoses 61, 62, 63, and 64 is reduced, and it is possible to reliably secure the space for arranging these hydraulic hoses.

Further, a hydraulic pump 21 for supplying hydraulic oil to the hydraulic equipment is provided, and the second control valve 12 has one tank port (sixth connection portion) 12b to which a hydraulic hose 66 connected to the hydraulic oil tank 22 is connected, and flood control. It has one pump port (fifth connection part) 12a to which the hydraulic hose 65 connected to the pump 21 is connected, the tank port 12b also serves as the tank port of a plurality of valves, and the pump port is a pump of a plurality of valves. Also serves as a port. As a result, the second control valve 12 can be miniaturized, and the number of hydraulic hoses connected to the second connection valve 12 can be reduced. Therefore, the assembling property of the hydraulic hose to the second connection valve 12 is improved.

Further, the working machine 1 of the present embodiment has a substrate 9 that can be swiveled around the vertical axis O, a step 20 that is provided above the substrate 9 and supports the driver's seat 6, and between the step 20 and the substrate 9. The first hose 761 passing through, the second hose 762 passing between the step 20 and the substrate 9, and the first connecting tool 77 connecting the first hose 761 and the second hose 762 are provided, and the first connecting tool is provided. 77 is located below step 20 and is arranged on the one end side of the intermediate point M between the vertical axis O and one end of the substrate 9 in the direction perpendicular to the vertical axis O. As a result, the first connector 77 is arranged at a position on the one end portion 9b side in the width direction of the substrate 9 and away from the vertical axis (swivel center) O. In other words, the first connector 77 is arranged at a position close to one end 9b in the width direction of the substrate 9. Therefore, the work of connecting the first hose 761 and the second hose 762 via the first connector 77 can be easily performed.

Further, a swivel bearing 8 that rotatably supports the substrate 9 around the vertical axis O is provided, and the first connector 77 is provided on the substrate 9 outside the direction perpendicular to the vertical axis O with respect to the outer circumference of the swivel bearing 8. The first connector 77 is arranged at a position away from the vertical axis O. Thereby, the connection work of the first hose 761 and the second hose 762 can be easily performed below the step 20.

Further, the third hose 941 passing between the step 20 and the substrate 9 separately from the first hose 761 and the second hose 762, and the step 20 separately from the first hose 761, the second hose 762 and the third hose 941. The fourth hose 942 passing between the hose and the substrate 9, the third hose 941 and the fourth hose 942 are connected, and the second connector 95 arranged at one end side from the intermediate point M and the substrate. A plurality of hose guides 96 and 97 provided on the 9 and guiding the third hose 941 are provided. Thereby, the work of connecting the third hose 941 and the fourth hose 942 via the second connector 95 can be easily performed. Further, since the third hose 941 is guided by the hose guides 96 and 97, the movement of the second connector 95 connected to the third hose 941 is restricted, so that the second connector 95 is moved from the vertical axis O. Maintained in a distant position.

Further, the first connector 77 and the second connector 95 are arranged close to each other. As a result, the work of connecting the first hose 761 and the second hose 762 to the first connector 77 and the work of connecting the third hose 941 and the fourth hose 942 to the second connector 95 can be easily performed. it can.
Further, the first connector 77 has a connecting portion for connecting the first hose 761 and the second hose 762 arranged below the first hose 761, and the second connector 95 has the third hose 941. It has a connecting portion for connecting the hose 941 and the fourth hose 942 arranged in a substantially horizontal direction with respect to the third hose 941. As a result, the connection direction (vertical direction) of the first hose 761 and the second hose 762 connected to the first connector 77 and the connection of the third hose 941 and the fourth hose 942 connected to the second connector 95. Since the directions (horizontal directions) are different, it is possible to prevent the two hoses from interfering with each other (entanglement), and it is possible to prevent the hoses from being erroneously connected due to the different directions.

Further, the first hose 761 and the third hose 941 are connected to the equipment provided in the engine room E1, and the second hose 762 and the fourth hose 942 are connected to the equipment provided above the step 20. .. As a result, the equipment in the engine room and the equipment above step 20 can be easily connected.
Further, the plurality of hose guides have a first hose guide 96 arranged on the vertical axis O side of the intermediate point M and a second hose guide 97 arranged on the one end side of the intermediate point M. Therefore, the path of the third hose 941 can be reliably regulated by the two hose guides. Therefore, the second connector 95 connected to the third hose 941 is reliably maintained at a position away from the vertical axis O.

Further, the relay plate 110 fixed to the lower surface of the step 20 and the pipe joints 111, 112, 113 for connecting the two hoses (114 and 115, 116 and 117, 118 and 119) so as to be communicable are provided. Since the pipe joint penetrates the relay plate 110, projects to both sides of the relay plate 110, and is integrally connected to the relay plate, the hose can be easily assembled.

Further, a plurality of the pipe joints 111, 112, 113 are connected to the relay plate 110, and at least a part of the plurality of pipe joints 111, 112, 113 has a protrusion length in the same direction from the relay plate 110. Are different from each other, so that the hose can be easily connected (assembled) to the pipe joint.
Further, step 20 has an inner edge portion forming an inspection port 20d, and is a first pipe joint arranged as a plurality of pipe joints 111, 112, 113 below the inspection port 20d or near the inspection port 20d. By including the 111 and the second pipe joint 112 which is arranged below the first pipe joint 111 and has a different protrusion length from the first pipe joint 111, the pipe joint 111, from the top of step 20 via the inspection port 20d, You can access 112 to connect the hose to the fitting. Further, the hose can be easily connected to the second pipe joint 112 without being disturbed by the first pipe joint 111.

Further, the cabin 5 of the working machine 1 of the present embodiment includes a lower plate 128, a support column 122 connected to the lower plate 128 and extending upward, a first plate portion 131a connected to the upper surface of the lower plate 128, and a first plate portion 131a. It is provided with a first reinforcing member 131 having a second plate portion 131b that stands up from one plate portion 131a and is connected to a support column 122. Therefore, even when the work machine 1 swings back and forth, it is possible to suppress the occurrence of stress concentration at the connection portion between the support column 122 and the lower plate 128, and it is possible to improve the strength of the cabin 5.

Further, the second plate portion 131b includes a second reinforcing member 129 whose one end side is connected to the support column 122 and which is connected to the other end side of the second plate portion 131b. By connecting the second plate portion 131b and the second reinforcing member 129 in this way, stress concentration in the lower portion of the support column 122 is less likely to occur, and the strength of the cabin 5 can be further improved.
Further, the second plate portion 131b has an inclined plate portion 131f that gradually increases from the other end side toward the one end side. As a result, the area of the connecting portion between the second plate portion 131b and the support column 122 can be increased by the inclined plate portion 131f, so that the connection strength can be improved.

Further, the second reinforcing member 129 includes first end portions 129c and 129d connected to the support column 122 and second end portions 129e and 129f arranged at intervals from the support column 122 at the end portion on the support column 122 side. The second plate portion 131b has a first contact portion 131h connected to the second end portions 129e and 129f, and the first plate portion 131a abuts on the second end portions 129e and 129f. It has two contact portions 131i. As a result, the support column 122 can be reinforced by the first reinforcing member 131 and the second reinforcing member 129.

Further, the lower plate 128 has a plurality of fixing portions 133a and 133b fixed to the machine body 2 of the working machine 1, and the first contact portion 131h and the second contact portion 131i are said to be the second plate portion 131b. The position along the direction from one end side to the other end side is the position between the adjacent fixing portions 133a and 133b. As a result, the first contact portion 131h and the second contact portion 131i are located between the fixed portions 133a and 133b, which are the portions fixed to the machine body 2 and have high strength, so that high strength can be obtained. it can.

Further, a floor mat 134 mounted on the upper surface of the lower plate 128 is provided, the second plate portion 131b has a low plate portion 131 g lower than the inclined plate portion 131f, and the floor mat 134 is a side surface of the second plate portion 131b. It has an edge portion (left edge portion) 134b that is in contact with the lower plate portion and is arranged at the same height as the low plate portion 131 g. As a result, when the earth and sand accumulated on the floor mat 134 is swept out from the cabin 5, it can be easily swept out without being disturbed by the second plate 131b. Further, since the edge portion of the floor mat 134 fits well, a good appearance can be obtained.

Further, the floor mat 134 has an inclined surface (first inclined surface 134h, second inclined surface 134i) that rises from the inside of the floor mat 134 toward the edge portion (left edge portion) 134b. As a result, when the earth and sand accumulated on the floor mat 134 are swept out from the cabin 5, the inclined surface can be used to sweep out over 131 g of the low plate portion. Therefore, it becomes easy to sweep out the earth and sand, and it is possible to prevent contamination of the flood control equipment due to the earth and sand accumulated on the floor mat 134.

Further, since the working machine 1 of the present embodiment includes the cabin 5 described above, stress concentration occurs at the connection portion between the support column 122 of the cabin 5 and the lower plate 128 even when the working machine 1 swings back and forth. It is a working machine that can be suppressed and the strength of the cabin 5 is improved.
Further, the work machine 1 includes a work device 4 driven by a hydraulic device, a driver's seat 6 provided in the cabin 5, a control box 135L provided on one side of the driver's seat 6, and a driver's seat 6. An operation pedal (SP pedal) 105 provided in the front, an unload lever 137 that is swingably supported by the control box 135L and can operate whether or not hydraulic oil is supplied to the flood control device by the swing. The front end portion 137a of the unload lever 137 is located on the one side side of the straight line connecting the one side end portion of the operation pedal 105 and the one side end portion of the driver's seat 6. To position. As a result, the knees of the operator seated in the driver's seat 6 are less likely to come into contact with the unload lever 137. Further, it is possible to prevent the operation of the operation pedal 105 by the operator's foot from being hindered by the unload lever 137.

Further, the unload lever 137 can be swung in the vertical direction, and the upper end portion 137b of the unload lever 137 is above the upper surface front end portion 135La of the control box 135L in a state where the unload lever 137 is swung downward. Is located in. As a result, it is possible to more reliably prevent the knee of the operator seated in the driver's seat 6 from coming into contact with the unload lever 137.

Further, the working machine 1 of the present embodiment has a machine body 2, a first fixing portion 146 fixed to the machine body 2, and a recess (first recess 141L) recessed from a surface opposite to the machine body 2 toward the machine body 2. , 141R), the second fixing portions 157L, 157R fixed to the first weight 10, and the first surface 100F, which is the surface on the first weight 10 side, projecting into the recesses 141L, 141R. The protruding portions 161L and 161R, and the mounting portions 158L and 158R provided at positions corresponding to the protruding portions 161L and 161R of the second surface 100R, which is the surface opposite to the first surface 100F, and to which accessories can be attached. A second weight 100 and the like. As a result, the thickness of the mounting portions 158L and 158R provided at positions corresponding to the protruding portions 161L and 161R protruding into the recesses 141L and 141R and to which the accessories can be attached can be adjusted to the outer shape of the machine body 2 including the second weight 100. Can be formed thicker without increasing.

Further, the first fixing portion 146 is first fixed by including an insertion portion 147 provided in the recesses 141L and 141R and a fastener 148 inserted through the insertion portion 147 and fastened to the machine body 2. The portion 146 will be provided in the recesses 141L and 141R. Therefore, it is possible to project the protruding portions 161L and 161R into the recesses by utilizing the recesses 141L and 141R provided with the first fixing portion 146.

Further, since the mounting portions 158L and 158R are provided from the second surface 100R toward the protruding portions 161L and 161R and include the screw hole 160 into which the accessory can be screwed, the accessory can be provided by using the screw hole 160. It can be securely attached to the attachment portions 158L and 158R.
Further, the first weight 10 has reflectors 153L and 153R attached to the surface opposite to the machine body 2, and the second weight 100 has notches 155L and 155R that expose the reflectors 153L and 153R. Therefore, it is possible to avoid covering the reflective materials 153L and 153R when the second weight 100 is attached to the first weight 10. Therefore, it is not necessary to attach another reflective material to the second weight 100.

Further, since the first weight 10 has an inner edge portion forming the intake ports 140L and 140R, and the second weight 100 exposes the intake ports 140L and 140R and is fixed to the first weight 10, the second weight 100 is fixed to the first weight 10. The installation of 100 does not hinder the intake of outside air from the intake port 140 into the body 2.
Although the embodiments of the present invention have been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

22 Hydraulic oil tank 80 Switching valve 81 Inlet port 82 1st outlet port 83 2nd outlet port 84 Operation handle 84a Rotating shaft 85 Return oil passage 86 1st oil passage (1st pipe material)
86A 1st connection member 86B Connection pipe 86C Pipe joint 87 2nd oil passage (2nd pipe material)
V8 control valve (first valve for SP)

Claims (4)

The hydraulic oil tank and
Flood control equipment operated by hydraulic oil and
A control valve that controls the operation of the hydraulic equipment,
An inlet port to which a return oil passage through which the hydraulic oil returned from the hydraulic equipment flows is connected, a first outlet port to which a first pipe material forming a first oil passage connected to the control valve is connected, and the hydraulic oil. An operation handle for switching the connection destination of the return oil passage to the second outlet port to which the second pipe material forming the second oil passage connected to the tank is connected to either the first oil passage or the second oil passage. With a switching valve and
The first pipe material is a pipe joint that connects a first connecting member connected to the first outlet port, a connecting pipe connected to the inlet port of the control valve, and the first connecting member and the connecting pipe. The first connecting member, the connecting pipe, and the pipe joint are made of a rigid material.
The switching valve is supported above the control valve by the first pipe material.
A working machine in which the rotation direction of the screw of the pipe joint is the same as the rotation direction of the operation handle, and the O-ring is built in the pipe joint of the first pipe material. The working machine according to claim 1, wherein the first pipe material and the operation handle are arranged so that the central axis of the pipe joint and the rotation axis of the operation handle face in the vertical direction. The work machine according to claim 1 or 2, wherein the rotation axis of the operation handle is arranged at a position between the first outlet port and the second outlet port. The second pipe material is made of a rigid material and is made of a rigid material.
The working machine according to any one of claims 1 to 3, wherein the switching valve is supported above the control valve by the first pipe material and the second pipe material.

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