JP4170880B2 - Swivel work machine - Google Patents

Description

  The present invention relates to a turning work machine having a turntable and a ground work device.

Conventionally, a swivel base is provided on a traveling body having front and rear wheels via a swivel bearing, and an upper structure having a driver's seat and a control device on the swivel base, and a ground work device having a work tool that can be raised and lowered. There is a turning work machine in which an engine is mounted on a swivel as a part of an upper structure and a driver's seat is arranged directly above a turning shaft (for example, see Patent Document 1).
In the turning work machine, since the upper surface of the traveling body is flat and positioned higher than the upper ends of the front and rear wheels, and the engine is on the turning table, the upper structure includes a fuel tank, a hydraulic oil tank, and a hydraulic device. Etc., the hydraulic pump is driven by the engine, the hydraulic oil is supplied to the traveling hydraulic motor provided in the traveling body, and the front and rear wheels are driven via the transmission.
JP 2001-97017 A

In the turning work machine, since the engine or the like is on the turntable, there are problems that the position of the center of gravity is high and the running stability is poor, and the weight of the upper structure is heavy, and the turning workability is also bad. is there.
Therefore, it is considered to provide an engine or the like on the traveling body side to solve the above problem, but when the engine or the like is disposed on the traveling body side, in order to achieve a weight balance with the ground work device at the front of the swivel base, It is necessary to mount a large counterweight at the rear of the swivel.
In addition, the swivel platform is equipped with a control valve that is a collection of control valves that control the hydraulic actuators installed in the swivel work machines such as the hydraulic cylinders used in ground work equipment. If it is arranged on the side or front of the seat, there is a problem that the living space can be restricted, and if it is arranged below the driver's seat, the ground height of the driver's seat increases, which is not preferable.

  Therefore, in view of the above problems, the present invention can provide an engine or the like on the traveling body side to improve traveling stability and turning workability, secure a living space, and reduce counterweight. An object of the present invention is to provide a swivel work machine that can be used or can eliminate the need for a counterweight.

The technical means taken in order for the present invention to achieve the above object is to provide a traveling drive apparatus having a swivel base on a traveling body so as to be pivotable about a vertical axis, and having an engine, a hydraulic pump, and a power transmission mechanism on the traveling body side. A fuel tank and a hydraulic oil tank, and a driver's seat disposed at the rear of the swivel on the swivel side, a ground work device disposed in front of the driver's seat, and a swivel work machine And a control valve formed by collecting hydraulic control valves for controlling the hydraulic equipment, the control valve is disposed behind the driver's seat ,
Each hydraulic control valve constituting the control valve is constituted by a direct acting spool type switching valve, and each hydraulic control valve is arranged and connected in a direction orthogonal to the spool and arranged in the front-rear direction. To do.
In addition, an operation lever for operating each hydraulic control valve of the control valve is preferably arranged on the side of the front part of the driver's seat.

Also, placing the remote control valve for operating the pilot pressure to the hydraulic control valve on the side of the control valve, not good that interlockingly connected through the operation lever and the link mechanism of the driver's seat side of the remote control valve.
Also, the swivel base of the driver's seat rearward in generator, a hydraulic motor for driving the the generator, it is preferable to place a battery for storing electricity generated by the generator.

According to the present invention, the running stability and the turning workability are improved by providing the traveling drive device having the engine, the hydraulic pump and the power transmission mechanism, the fuel tank, and the hydraulic oil tank on the traveling body side.
In addition, by arranging a control valve that integrates hydraulic control valves behind the swivel driver's seat, a living space can be secured, and the control valve can counter the weight of the ground work device at the front of the swivel. It serves as a weight, and counterweight can be reduced or counterweight can be eliminated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-7, 1 is a wheel type work machine illustrated as a turning work machine. This wheel type work machine 1 is roughly divided into a four-wheel type traveling body 4 having a pair of left and right front and rear wheels 2 and 3, An upper structure having a swivel base 6 provided on the traveling body 4 through a swivel bearing 36 and capable of swiveling about a vertical axis (swivel axis) 5S, and a driver seat 7 and a control device 8 thereon. 11, a ground work device (excavation device) 9 provided on the swivel base 6, and front and rear dozers (stabilizers) 10 </ b> F and 10 </ b> R provided on the front and rear portions of the traveling body 4.

A pivot shaft (swivel joint) 5 is disposed concentrically with the pivot axis 5S at the center of the inner periphery of the pivot bearing 36.
The ground work device 9 has a boom 42 provided on the front side of the swivel base 6 so as to be swingable up and down by a boom cylinder 43, and an arm 44 swingable up and down by an arm cylinder 45 at the tip of the boom 42. The arm 44 has a work tool (bucket or the like) 46 that can swing up and down around the left and right axis by a work tool cylinder 47.
The work tool 46 is supported so that its left and right central portions can rotate about the front and rear axis, and the left and right sides of the work tool 46 can be swung up and down by a tilt cylinder 184.

At the front part on the swivel base 6, a work device support part 37 that supports the ground work device 9 on the upper side of the swivel base 6 so as to be able to swing left and right is erected, and a rear wall part 34 stands at the rear part of the swivel base 6. The left and right rising ribs 35 which are provided and are erected in the middle part connect the working device support part 37 and the rear wall part 34, thereby forming the swivel base 6 in a solid three-dimensional structure.
The handle 73 of the control device 8 is disposed at the substantially horizontal center (may be displaced to the left) of the front portion of the swivel 6, whereas the work device support portion 37 is slightly displaced to the right. This makes it easy to see the working state of the ground work device 9.

1 to 4, 14, 23, and 24, the work device support portion 37 is erected on the front portion of the swivel base 6 so as to connect the front ends of the left and right rising ribs 35 and cover the front side of the control device 8. The vertical swing shaft 39 is supported.
A swing body 40 that is swung by a swing cylinder 41 is pivotally supported on the swing shaft 39, and a boom 42 and a boom cylinder 43 that lifts and lowers the boom 42 are pivotally supported on the swing body 40 via horizontal axes 48A and 48B. ing.
The swing cylinder 41 is disposed above the pivot shaft 5 and between the left and right ribs 35.

The swing body 40 is pivotally supported on the upper portion of the work device support portion 37, and a rotary shaft 163 having a vertical axis is pivotally supported on the lower portion of the work device support portion 37, and an upper arm 164 and a lower arm are supported on the rotary shaft 163. 165 is fixed, the upper arm 164 is connected to the swing body 40 via the link 166, and the lower arm 165 is connected to the swing cylinder 41, and the operating force of the lower swing cylinder 41 is transferred to the upper swing body 40. It constitutes rising interlocking means for transmission.
The part pivotally supporting the lower boom 42 of the swing body 40 protrudes radially outward from the outer periphery of the swivel base 6 (the outer periphery rotation trajectory during turning), and the base of the boom cylinder 43 above the swing body 40. Is pivotally positioned above the swing shaft 39 and within the outer periphery of the swivel base 6.

The work device support portion 37 is disposed so as to be within a substantially range of the outer periphery of the swivel base 6, and the height of the swing body 40 is set above the highest position on the traveling body 4 side of the boom 42 and the boom cylinder 43. The height is set so that it can pass, and even if the boom 42 is turned rearward, it does not come into contact with the front portion of the bonnet cover 80 if the boom 42 is in a position higher than the horizontal position.
That is, the ground work device 9 on the turntable 6 is configured not to collide with the traveling body 4 side even when turning, and can perform ground work in a state where the turntable 6 is in the backward posture. Excavation work is possible.

The boom cylinder 43, the arm cylinder 45, the work tool cylinder 47, the tilt cylinder 184, and the swing cylinder 41 are constituted by hydraulic cylinders.
The traveling body 4 includes a traveling drive device 12 having an engine 13 and a power transmission mechanism 14, a vehicle body frame 21, a front wheel device 61F that mounts the front wheel 2, a rear wheel device 61R that mounts the rear wheel 3, and the like. ing.
Further, the traveling body 4 is provided with an engine 13 at the rear, and a switching valve 169, 175, 178, 197, 198 for controlling hydraulic equipment provided on the traveling body 4 side is integrated at the front. A valve assembly 54 is disposed (see FIGS. 4, 6, and 27), and a steering device 8 is disposed in front of the driver's seat 7 in the upper structure 11.

2, 4, 5, 8 to 10, the vehicle body frame 21 has a ladder shape in plan view, and the front and rear portions of a pair of left and right side pipes 22 are connected by plate-like front and rear frames 23F and 23R. The midway part is connected by a bearing support member 25 to which the slewing bearing 36 is mounted, and is connected by a plurality of connecting members in the front-rear direction. The left and right side frames 22 are connected with the engine 13 arranged from the middle to the rear, and a radiator 62 mounted on the rear is also connected.
In the plan view of the vehicle body frame 21, the left and right side frames 22 each have a midway portion 22 a that overlaps the swivel base 6 so as to be wider in the left-right direction than the front and rear portions, and bends from the front and rear portions at two front and rear locations. As a result, it has a trapezoidal bulging shape outward.

In the side view of the vehicle body frame 21, the left and right side frames 22 have a midway portion 22 a below the swivel base 6 positioned at the lowest position, and the front and rear portions are positioned at a high position by lifting from the midway portion 22 a back and forth. In addition, the racks 61F and 61R for the front and rear wheels 2 and 3 can be arranged below the front and rear portions.
Each of the left and right side frames 22 is formed so that the left and right width of the midway portion 22a is wider than the left and right widths of the front and rear portions, and reinforcing plates 22b are provided on the upper and lower surfaces at the connecting portion between the midway portion 22a and the front and rear portions.
The ladder-shaped body frame 21 has a shape in which a midway portion 22a is expanded from the front and rear portions to the left and right outer sides, the left and right side portions are located outside the outer periphery of the swivel bearing 36, and the outer periphery of the swivel bearing 36 and the swivel 6 It is designed to be between the outer periphery and the upper part of the structure, and it has a strong structure that can fully support the upper load and distribute the load even in the longitudinal direction. The slewing bearing 36 and the slewing base 6 can be arranged at a position lower than the upper ends of the front and rear wheels 2 and 3.

As shown in FIGS. 2 and 3, the front wheel mounting device 61F houses a front wheel differential device 64F in a cylindrical front axle case (difference case) 63F, and the vehicle body frame 21 is centered in the left-right direction of the front axle case 63F. The left and right end portions are supported so as to swing up and down via a center pin 65F in the front-rear direction.
Further, a bevel gear case 66F that supports a king pin is provided at the left and right ends of the front axle case 63F, and a final transmission case 67F is provided on the bevel gear case 66F so as to be swingable around the king pin. The wheel shaft on which the final transmission case 67F is supported The front wheel 2 is attached to 68F, and the left and right front wheels 2 can be steered by the steering means 69 via the final transmission case 67F.

3 and 11, a rear wheel rack 61R, like the front wheel rack 61F, houses a rear wheel differential device 64R in a cylindrical rear axle case 63R, and a king pin at the left and right ends of the rear axle case 63R. A bevel gear case 66R for supporting 66a is provided, a final transmission case 67R is provided on the bevel gear case 66R so as to be swingable about the king pin 66a, and the rear wheel 3 is attached to the wheel shaft 68R supported by the final transmission case 67R for rear steering. By means 69, the left and right rear wheels 3 can be steered via the final transmission case 67R.
In the same manner as the front wheel rack 61F, the rear wheel rack 61R swings up and down at the center in the left-right direction of the rear axle case 63R via a center pin in the front-rear direction of the rear lower part of the body frame 21. However, in the embodiment, the rear axle case 63 </ b> R is fixed to the vehicle body frame 21.

In the rear wheel rack 61R, a rear axle case 63R is formed of a left and right divided body, a rear wheel differential device 64R is built in one divided body, and a bevel pinion shaft to which power is transmitted from the power transmission mechanism 14 is provided. The other divided body has a shape that does not support the rear wheel differential device 64R and the bevel pinion shaft 86R.
Each of the left and right rear axle cases 63R has a brake portion 63a formed at the outer end, a differential lock portion 63b formed inside the brake portion 63a, and a bevel gear case 66R fixed to the outer ends of the left and right brake portions 63a. A final transmission case 67R that supports the rear wheel 3 via a wheel shaft 68R is attached to the case 66R, and the differential yoke shaft 70 penetrates from the rear wheel differential device 64R into the left and right bevel gear case 66R. The differential yoke shaft 70 and the brake portion 63a. A hydraulic brake mechanism A is disposed between the differential yoke shaft 70 and the differential lock portion 63b. A hydraulic differential lock 177 is disposed between the differential yoke shaft 70 and the differential lock portion 63b.

The bevel gear case 66R is inserted into the outer end of the brake part 63a and is in-row coupled, and a piston A2 that presses the disc A1 of the brake mechanism A against the insertion part 66b of the bevel gear case 66R is provided in the brake part 63a. The piston A2 is pushed by hydraulic pressure supplied from the outside, whereby the disc A1 is pressed against the fitting portion 66b of the bevel gear case 66R to brake the differential yoke shaft 70.
Each of the left and right rear axle cases 63R protrudes from cylinder mounting portions facing each other, and a steering cylinder 71 of the steering means 69 is mounted to both the cylinder mounting portions.

The steering means 69 includes a hydraulic cylinder (power steering cylinder) 71 provided in the rear axle case 63R, and tie rods 72 that connect both ends of the piston rod 71a of the hydraulic cylinder 71 and the left and right end transmission cases 67R. The left and right end transmission case 67R is rotated around the king pin 66a by the left and right movement of the piston rod 71a, and the rear wheel 3 is steered.
An arm 120 is fixed to the left end transmission case 67R, and a first interlocking rod 121 is connected to the arm 120. Reference numeral 122 denotes an interlocking body having a midway part pivotally supported by a midway part 22 a of the left side frame 22 via a vertical axis. One end portions of the first interlocking rod 121 and the second interlocking rod 123 are provided at both ends of the interlocking body 122. The other end of the second interlocking rod 123 is connected to the arm 124 provided in the left end transmission case 67F for the front wheel 2, and the knuckle arm 125 of the left and right end transmission case 67F is connected by the tie rod 126. Yes.

When the steering means 69 operates the hydraulic cylinder 71 to steer the rear wheel 3, the front wheel 2 is also steered simultaneously via the interlocking body 122 and the first and second interlocking rods 121, 123. The steering directions of the front and rear wheels 2 and 3 are reversed. The steering directions of the front and rear wheels 2 and 3 can be made the same.
The traveling body 4 is a two-shaft four-wheel drive type in which power is transmitted from the traveling drive device 12 to the front wheel differential device 64F and the rear wheel differential device 64R, and the front / rear steering means 69F and 69R are controlled by steering a single handle 73. In this manner, the front and rear wheels 2, 3 are steered in opposite directions (or in the same direction).

However, the traveling body 4 may be configured such that only one of the front and rear wheels 2 and 3 is set as a driving wheel and a steering wheel, and the other is set as a driven wheel and a straight traveling wheel. It may be configured to drive and constantly steer, and to drive or steer the other as appropriate.
The front and rear wheels 2 and 3 have substantially the same diameter, but either one of the front and rear wheels may have a large diameter.
In FIGS. 1, 2, 6, and 7, a pair of left and right upper arm support portions 74U and lower arm support are provided to attach the dozers 10F and 10R to the front and rear portions (front and rear frames 23F and 23R) of the traveling body 4, respectively. The portion 74D and the center upper cylinder support portion 75 are formed to project forward.

  Each of the front and rear dozers 10F and 10R includes a blade 76 and a pair of left and right upper arms that are attached to the upper back of the blade 76 and pivotally supported by the upper arm support portion 74U so as to be movable up and down (movable up and down). 77U, a pair of left and right lower arms 77D attached to the lower back of the blade 76 and pivotally supported by the lower arm support portion 74D so as to be movable up and down (movable up and down), and pivotally supported by the cylinder support portion 75 And a dozer cylinder 78 composed of a hydraulic cylinder that moves the blade 76 up and down by swinging the upper arm 77U and the lower arm 77D, so that the blade 76 can come into contact with the ground surface or can enter the ground. It has become.

These dozers 10F and 10R have substantially the same function as the backhoe dozer device, but when the excavation work by the ground work device 9 is the main work, the main function is as a stabilizer (outrigger) of the traveling body 4, Although it may be arranged on one side of the front and rear of the traveling body 4, it is disposed on both the front and rear sides so that the traveling body 4 can be lifted from the ground during work.
1, 2, 5 to 8, 14, 15, the fuel tank 16 is attached to the left and right sides (left side) between the front and rear wheels 2 and 3 on the left and right side portions (side frame 22) of the traveling body 4. The hydraulic oil tank 17 and the battery 18 behind it are equipped on the left and right other sides (right side). The fuel tank 16 and the hydraulic oil tank 17 may be reversed right and left, and by separating them from left and right, the right and left weight balance of the traveling body 4 is improved and the space between the front and rear wheels 2 and 3 is effectively used. ing.

The fuel tank 16, the hydraulic oil tank 17, and the battery 18 are arranged on the vehicle body frame 21 in a left-right manner. The hydraulic oil tank 17 is detachably attached to the right side frame 22, has a substantially L-shape in front view, and has an extension part 17a that enters the lower side of the right side frame 22, and an oil filter is provided in the extension part 17a. 130 is disposed, and has a substantially L shape in plan view, and forms a recess 17b in which the battery 18 is disposed.
The concave portion 17b is formed in the left and right inner portions on the rear side of the hydraulic oil tank 17, and by arranging the battery 18 here, the battery 18 is covered by the hydraulic oil tank 17 from the outside and the front. Yes.

In the front lower part of the hydraulic oil tank 17, a bowl-shaped opening 128 having continuous large and small holes 128 a and 128 b is formed, and a lid 129 for closing the opening 128 is also bowl-shaped. The oil filter (suction filter) 130 and a suction pipe 131 communicating with the oil filter (suction filter) 130 are connected to the small hole corresponding portion 129a. The suction pipe 131 is connected to various valves through the lower side of the side frame 22. .
When the oil filter 130 is attached to the lid body 129, it is inserted through the large hole 128b and moved toward the small hole 128a, so that the lid body 129 is attached corresponding to the fistula. Maintenance is facilitated by facilitating insertion of the 130 into the opening 128.

A discharge pipe 132 is connected from the pump 133 of the hydraulic oil tank 17 to the hydraulic pump on the engine 13 side through the battery 18 and the lower side of the side frame 22.
A plurality of latching pins 134a project from the upper portion of the right side frame 22 so that the hydraulic oil tank 17 can be temporarily secured to the latching pins 134a. The tank temporary fixing means 134 is constituted by a hooking member 134b with a hole on the hydraulic oil tank 17 side.
Further, the hydraulic oil tank 17 temporarily fixed by the temporary fixing means 134 is finally fixed by the main mounting means 136. The main mounting means 136 is a front L-shaped fixed to the upper surface of the hydraulic oil tank 17. A rod 135d in the front-rear direction that is hooked on the hook 135c and a hook 135a that is fastened by nuts 135e to both ends of the rod 135d. The lower end of the hook 135a is connected to the right side. The nut 135e is tightened by being hooked on a hooking member 139a with a hole attached to the part frame 22 or the bracket 139b, and the hydraulic oil tank 17 is pulled to the right side frame 22 side to make a full stop.

The mounting means 136 may fix the hydraulic oil tank 17 to the right side frame 22 with a fastener such as a bolt.
A cushion material 137 such as rubber is disposed between the lower surface of the right side frame 22 and the extension portion 17a, and supports the hydraulic oil tank 17 so that the upper surface of the hydraulic oil tank 17 is substantially horizontal.
As shown by a two-dot chain line in FIG. 8, the hydraulic oil tank 17 is covered with a cover 138 whose outer surface and upper surface are substantially L-shaped when viewed from the front. The cover 138 is formed of a metal plate or plastic. The bracket 139b is fixed to the right frame 22 on both the front and rear sides of the hydraulic oil tank 17 via a pedestal or the like. An upper horizontal portion of the cover 138 is a step portion 138A.

The fuel tank 16 is made of plastic or sheet metal and is fixed to the outer surface of the left side frame 22.
Specifically, a pair of front and rear brackets 190 project from the left and right outwards on the outer surface of the left side frame 22, and the fuel tank 16 is attached to the front and rear brackets 190 between the front and rear.
Like the hydraulic oil tank 17, the fuel tank 16 is formed in a substantially L shape having an extension that enters the lower side of the side frame 22, and is attached via a tank temporary fixing means and a tank main mounting means. Also good.

Similarly to the hydraulic oil tank 17, the upper surface and the outer surface of the fuel tank 16 are also covered with a cover 191, and this cover 191 is attached to the bracket 190 via a base 190a. The upper horizontal portion of the cover 191 is a step portion 191A.
The covers 138 and 191 may be flat plates that cover only the upper surfaces of the tanks 17 and 16, and may be fixed to the tanks 17 and 16.
1-4, 6, 7, 12, and 13, the traveling body 4 has a lower part of the swivel base 6 as a flat part 4A and a rear part of the swivel base 6 as a bulky part 4B. A bonnet cover 80 is detachably or closably provided on the shape portion 4B.

An engine 13 is disposed in the hood cover 80 of the bulky shape portion 4B of the traveling body 4, and a power transmission mechanism 14 is disposed in the flat shape portion 4A. The swivel base 6 is disposed above the flat portion 4A incorporating the power transmission mechanism 14, and the engine 13 has a structure in which the engine 13 protrudes rearward from the bottom of the swivel base 6.
The engine 13 may be arranged with the axis of the crankshaft 13A in the left-right direction, but here it is arranged along the front-rear direction, and the center 13S in the left-right direction (see FIG. 3) is the center in the left-right direction of the body frame 21 ( It is arranged concentrically with the center line (turning center) 5S of the turning shaft 5 or slightly shifted to the left or right (left side).

The radiator 62 disposed on the rear side of the engine 13 may be disposed at the center in the left-right direction of the vehicle body frame 21, but is deviated on the same side as the engine 13.
The power transmission mechanism 14 of the flat shape portion 4A may be a mechanical transmission, but here, a hydrostatic transmission (HST) 26 having a pump 81 and a motor 82 is combined with a reduction gear 87, and FIG. 4, 12 and 13, the transmission case 83 of the hydrostatic transmission 26 supports a pump 81 side input shaft 27 and a motor 82 side output shaft 28 to which power is transmitted from the engine 13. However, these are arranged along the front-rear direction in plan view. The transmission case 83 of the transmission 26 and the front and rear cases 87A and 87B of the speed reducer 87 are integrally coupled, and the input shaft 27 and the output shaft 28 are inclined slightly forward and downward in a side view. .

The reduction gear 87 houses two sets of reduction gear groups 107 and 108 in the front and rear cases 87A and 87B. The front and rear cases 87A and 87B are formed with a short vertical width and a long horizontal width. A charge pump 109 and a hydraulic clutch 110 controlled by the charge pump 109 are provided.
The input shaft 27 protrudes forward and backward from the mission case 83, the rear side is connected to the crankshaft 13 </ b> A via a flywheel, and the front side is supported by the rear case 87 </ b> B of the speed reducer 87. 107A is mounted and the charge pump 109 can be driven.

The gear 107 </ b> A of the reduction gear group 107 meshes with the gear 107 </ b> B, and this gear 107 </ b> B is attached to the clutch input shaft 111 of the hydraulic clutch 110. A clutch means 113 is provided between the clutch input shaft 111 and the clutch output shaft 112 of the hydraulic clutch 110, and can be connected and disconnected from the charge pump 109 with pressure oil.
The clutch output shaft 112 drives a hydraulic pump 85 for supplying hydraulic oil with a large load via a universal joint shaft.
The charge pump 109 is formed by a trochoid pump or the like, and is driven when the engine 13 is driven. The charge pump 109 is supplied with pressure oil of a required pressure to maintain the contact state, and when the engine 13 is stopped, the charge pump is driven. 109 also stops and the clutch means 113 is turned off. Therefore, when the engine 13 is started, it can be performed without applying the load of the hydraulic pump 85 to the clutch output shaft 112, and the load at the time of starting can be reduced.

The output shaft 28 of the motor 82 is provided with a gear 108 </ b> A of the reduction gear group 108, and this gear 108 </ b> A is engaged with a gear 108 </ b> B provided on the propulsion shaft 114. In the propulsion shaft 114, the speed reducer 87 projects forward and backward from the front and rear cases 87A and 87B, and the bevel pinion shafts 86F and 86R of the front wheel differential device 64F and the rear wheel differential device 64R via the front and rear universal joint shafts 29F and 29R. It is connected with.
By using the front and rear universal joint shafts 29F and 29R for power transmission to the front and rear wheels 2 and 3, even when the bevel pinion shafts 86F and 86R are displaced from the center pin 65 in the left-right direction, the propulsion shaft 114 is directed forward and downward. Even if the vehicle is inclined, power can be transmitted to the front and rear wheel differential device 64, and the front axle case 63F can be swung up and down.

1 to 7, a swing bearing 36 that rotatably supports the swivel base 6 on the traveling body 4, a ring gear 88 provided on the inner periphery of the swing bearing 36, and a drive pinion 89 that meshes with the ring gear 88. In addition, a hydraulic turning motor 15 that drives the drive pinion 89 to turn the turntable 6 and a turning shaft 5 are provided.
The swivel shaft 5 disposed at the center 5S (inner peripheral side center) of the swivel bearing 36 is composed of a swivel joint, and a hydraulic oil circuit that connects the hydraulic pump 85 and a hydraulic control valve on the swivel base 6 side, a hydraulic pump 85, etc. and a pilot circuit for connecting a remote control valve for operating a pilot switching valve on the swivel base 6, a hydraulic oil circuit for connecting a hydraulic control valve on the swivel base 6 and a hydraulic device on the traveling body 4, a swivel base 6 An electric circuit or the like that connects the operation means on the side and the electrical equipment (starter, solenoid valve, etc.) on the traveling body side can be connected even when the swivel base 6 is rotating.

The swing motor 15, the universal joint shaft 29, the hydraulic pump 85, etc. constitute a part of the power transmission mechanism 14 of the travel drive device 12, and are lower than the upper surface of the body frame 21 and higher than the lower end of the engine 13. And is arranged compactly in the vertical direction, in the front-rear direction, and in the left-right direction around the pivot shaft 5.
The swivel base 6, a driver seat 7 disposed at the rear upper part of the swivel base 6 of the swivel shaft 5, a control device 8 disposed in front of the swivel base 6 in front of the driver seat 7, The upper structure 11 is configured by an operation device 55 or the like for operating the ground work device 9 or the like disposed around.

The center 5S of the turning shaft 5 is arranged slightly in front of the center P between the front and rear wheels 2 and 3, and the driver's seat 7 is steered to the rear side of the turntable 6 with the turning shaft 5 as a boundary. The device 8 and the ground work device 9 are respectively arranged, and the upper structure 11 has a front end of the control device 8 and a rear portion of the driver's seat 7.
As shown in FIGS. 4 and 23 to 26, the rear part of the swivel base 6 is provided so as to extend rearward from the upper part of the rear wall part 34 of the swivel base 6, and protrudes upward from the engine 13. A driver's seat arrangement frame 51 is provided.

In this driver seat frame 51, a pair of left and right pipe cross members 51B are fixed to a mounting plate 51A fixed to the upper surface of the rear wall 34, and a pipe vertical member 51C protrudes rearward from the left and right cross members 51B. The left and right vertical members 51C are connected by a plurality of connecting members 51D.
A driver's seat 7 is attached to the front portion of the driver's seat arrangement frame 51, and a hydraulic device (such as a hydraulic actuator) installed in the turning work machine 1 is controlled at a rear portion (rear side of the driver's seat 7). A control valve 56 formed by integrating the hydraulic control valves 56a to 56g, a generator 159, a hydraulic motor 158 for driving the generator 159, and a battery 160 for storing electricity generated by the generator 159 are mounted.

The battery 160 serves as an electricity supply source on the upper structure 11 side of the turning work machine 1.
The control valve 56, the generator 159, the hydraulic motor 158, and the battery 160 are fixedly attached to the driver seat arrangement frame 51 via a support member, and the control valve 56 is substantially in the left-right direction of the driver seat arrangement frame 51. Arranged in the center, the generator 159 is arranged on one side (left side) of the driver seat arrangement frame 51, the hydraulic motor 158 is arranged on the front side of the generator 159, and the battery 160 is arranged in the driver seat arrangement frame. 51 is arranged on the other side (right side) in the left-right direction.

The control valve 56 is arranged between the left and right vertical members 51C of the driver seat arrangement frame 51, and the control valve 56 is arranged so that the center of gravity is lowered.
Further, the generator 159, the hydraulic motor 158, and the battery 160 are disposed above the control valve 56.
In the turning work machine provided with the engine behind the driver's seat on the turntable side, the engine functions as a counterweight that balances the weight with the ground work machine in the front, but the turning work of the present embodiment In the machine 1, since the engine 13 is provided on the traveling body 4 side, a large counterweight is required on the rear side of the swivel base 6. By providing the control valve 56 on the rear side, the control valve 56 serves as a counterweight, and the weight of the counterweight can be reduced (or the counterweight can be made unnecessary).

Further, in the present embodiment, a generator 159, a hydraulic motor 158, and a battery 160 are also provided on the rear side of the driver's seat 7, and these also serve as counterweights. The weight can be reduced (or the counterweight can be eliminated).
The control valve 56 is configured by arranging hydraulic control valves 56a to 56g constituted by direct acting spool type switching valves side by side in a direction orthogonal to the spool and in the front and rear direction, and connecting and integrating all the hydraulic control valves 56a to 56g. Has been.

The hydraulic control valves 56 a to 56 g will be described in order from the rear end side. 56 a is a hydraulic control valve that controls the tilt cylinder 184, 56 b is a hydraulic control valve that controls the swing cylinder 41, and 56 c is a work implement cylinder 47. , 56d is a hydraulic control valve for controlling the boom cylinder 43, 56e is a hydraulic control valve for controlling the arm cylinder 45, and 56f is a hydraulic control valve for controlling the swing motor 15. , 56 g are hydraulic control valves for controlling the dozer cylinder 78.
Further, each of the hydraulic control valves 56a to 56g of the control valve 56 is constituted by a pilot operation switching valve operated by a pilot pressure, and operation levers 55L, 55R, 181 provided on the left and right sides of the front part of the driver's seat 7 are provided. It is operated by pilot pressure from remote control valves 196L, 196R, 193, 194, 195 (see FIG. 21) operated by 182 and 183.

Each of the hydraulic control valves 56a to 56g is provided with a connecting portion for connecting a pilot circuit connected to the remote control valves 193, 194, 195196L, 196R on both sides in the left-right direction, and the hydraulic pump 85 and the hydraulic actuator 15 on the upper surface side. , 41, 43, 45, 47, 78, 184 are connected to connect hydraulic fluid circuits.
In addition, hydraulic lines such as hydraulic hoses or steel pipes connected to the connection portions on the upper surface side of the hydraulic control valves 56a to 56g pass below or side of the driver's seat 7 and are connected to the hydraulic actuators 41, 43, 45, 47, 184 and the swivel joint 5 are piped.

Further, for example, the operation lever 55L is for operating the arm cylinder 45 and the turning motor 15 of the ground work apparatus 9, and the operation lever 55R is for operating the boom cylinder 43 and work implement cylinder 47 of the ground work apparatus 9. Yes, the operation lever 181 operates the swing cylinder 41, the operation lever 182 operates the tilt cylinder 184, and the operation lever 183 operates the dozer cylinder 78 (limited to this). Not)
Further, the operation lever 55L for operating the arm 44 and the swivel base 6 is disposed on the left side of the front portion of the driver's seat 7, and the remote control valve 196L operated by the operation lever 55L is disposed below the operation lever 55L. An operation lever 55R for operating 42 and the work tool 46 is disposed on the right side of the front portion of the driver's seat 7, and a remote control valve 196R operated by the operation lever 55R is disposed below the operation lever 55R.

  The operating lever 181 for operating the swing body 40 is disposed on the left side of the front portion of the driver's seat 7, and the remote control valve 193 operated by the operating lever 181 is on the left side of the front portion of the control valve 56 and below the hydraulic motor 158. The operation lever 182 for tilting the work tool 46 is disposed on the right side of the front portion of the driver's seat 7, and the remote control valve 194 operated by the operation lever 182 is on the right side of the rear portion of the control valve 56 and below the battery 160. An operation lever 183 for operating the front and rear dozers 10 is disposed on the right side of the front portion of the driver's seat 7 and on the front side of the operation lever 182, and the remote control valve 195 operated by the operation lever 183 is disposed in front of the control valve 56. The operation levers 181, 182, 18 are arranged on the right side of the unit and below the battery 160. And the remote control valve 193,194,195 are interlocked through the link (rod) 200A, 200B, and 200C.

  That is, the operation levers 181, 182, and 183 are cylindrical bodies 202 </ b> A, 202 </ b> B that are externally fitted around pivots 201 </ b> A, 201 </ b> B, 201 </ b> C in the left-right direction provided in the driver seat frame 51 so as to be rotatable about the axis. The arm members 203A, 203B, and 203C projecting in the radial direction are fixed to the cylinders 202A, 202B, and 202C. The arm members 203A, 203B, and 203C The operation portions 193a, 194b, and 195c of the remote control valves 193, 194, and 195 are interlocked and connected by the links 200A, 200B, and 200C, and the operation levers 181, 182, and 183 are swung back and forth to link 200A. , 200B, 200C are pushed and pulled to operate the remote control valves 193, 194, 195 193a, so that the 194b, 195c is operated.

The operating levers 181, 182, 183 and the spools of the hydraulic control valves 56 b, 56 a, 56 g are interlocked and connected via a link, and the spools of the hydraulic control valves 56 b, 56 a, 56 g are directly connected by the operating levers 181, 182, 183. The operation levers 181, 182 and 183 may be directly connected to the operation portions 193 a, 194 a and 195 a of the remote control valves 193, 194 and 195.
A hand accelerator lever 187 for operating the governor of the engine 13 and a travel lock lever 188 for operating the travel lock valve 175 are also arranged. The travel lock lever 188 is provided on both the left and right sides of the driver seat 7. Is provided.

  If the operating lever and the spool of the hydraulic control valve are linked and connected via a wire, link (rod), etc., the response from the operating lever to the hydraulic control valve will become less responsive due to play, backlash, deflection, etc. Although it is difficult to realize a turning work machine that is sensitive to the movement of the driver, in the embodiment having the above-described configuration, the operation levers 181, 182, and 183 on the side of the driver's seat 7 and the control valve 56 side By connecting the remote control valves 193, 194, 195 with one link 200A, 200B, 200C, it is possible to control the work machine 1 with high sensitivity.

The upper structure 11 has a swivel bearing 36 and a swivel base 6 disposed below the upper end of the engine 13 at the rear of the traveling body 4, and at least the swivel bearing 36 of the swivel bearing 36 and the swivel base 6 has the front and rear wheels 2. 3 and at a position lower than the upper end of at least one of the front and rear wheels 2 and 3.
In plan view, the swivel base 6 has a flat front portion, a rear portion and left and right side portions that are substantially circular, a rear portion that is close to the engine 13, and a front portion that is in a forward orientation and substantially at the same position as the rear ends of the left and right front wheels 2. Yes, when rotated, the outer periphery overlaps the rear ends of the left and right front wheels 2 in the front-rear direction. The swivel base 6 protrudes from the body frame 21 to the left and right outer sides, and overlaps the fuel tank 16 and the hydraulic oil tank 17 in the left-right direction.

That is, the swivel base 6 is set so as to have as large an area as possible within three points of the engine 13 at the substantially center in the left-right direction and the pair of front wheels 2 separated from the left and right. After making the required area, the dimensions of the traveling body 4 in the front-rear direction and the left-right direction are set to be compact.
Since the engine 13, the fuel tank 16, the hydraulic oil tank 17, the switching valve assembly 54, and the like are mounted on the traveling body 4, the traveling body 4 becomes heavier, and the upper structure 11 side is increased accordingly. Weight is reduced and it becomes compact in the front-rear direction and the left-right direction.
Accordingly, the total weight of the swivel base 6 and the driver's seat 7 thereon, the control device 8 and the ground work device 9 relative to the weight of the traveling body 4 having the front and rear wheels 2 and 3, at least the swivel base 6 and above. The total weight of the driver's seat 7 and the control device 8 can be set lightly.

Further, the power transmission mechanism 14 arranged around the turning shaft 5 and the triangular arrangement of the engine 13, the fuel tank 16 and the hydraulic oil tank 17 and the like provide a good weight balance around the turning shaft 5, and the traveling body. By arranging the engine 13 in the rear part of 4, the switching valve assembly 54 in the front part, and the hydraulic oil tank 17 and the fuel tank 16 in the left and right side parts, the weight balance in all directions is good.
The center of gravity Q of the work machine 1 is in the front and rear direction slightly in front of the center 5S of the swivel shaft 5 and near the rear end of the hydraulic pump 85, in the up and down direction, near the top surface of the swivel 6 and the swivel bearing 36, and in the left and right direction. It is positioned slightly to the right of 5S and overlaps with the turning motor 15.

In the working machine 1, the engine 13 is disposed on the traveling body 4 and the engine 13 is mounted on the traveling body 4 in order to lower the center of gravity Q of the traveling body 4 to achieve traveling stability, work stability, and the like. However, in order to arrange the swivel base 6 at a lower position, the engine 13 is disposed in the rear part of the traveling body 4, and the power transmission mechanism 14 is disposed in front of the engine 13 so that the traveling body 4 below the swivel base 6. The vertical dimension is reduced.
The distance L1 from the center 5S of the turning shaft 5 to the rear end of the upper structure 11 is within a distance L2 from the center 5S of the turning shaft 5 to the rear end of the rear wheel 3, and at least the center 5S of the turning shaft 5 to the traveling body 4 It is approximately within the distance L3 to the rear end. Thereby, even if the upper structure 11 is turned, it does not collide with an obstacle behind.

8, 12, 14, 16, and 17, the swivel joint (swivel shaft) 5 includes a cylindrical body (fixed side member) 141 having an axis that coincides with the rotational axis 5 </ b> S, and a shaft within the cylindrical body 141. A center shaft (movable side member) 143 fitted from above to be rotatable around the center, and a cylindrical oil passage connecting ring (movable side member) 144 provided on the upper portion of the center shaft 143; An energizing means 145 is provided below the cylindrical body 141 and the central shaft 143.
The cylindrical body 141 is fixed to the vehicle body frame 21 of the traveling body 4 via a bracket 140 and is connected to hydraulic equipment on the traveling body 4 side.

The middle shaft 143 and the oil passage connection ring 144 are prevented from rotating with respect to the swivel base 6 via a stop plate 142 provided on the upper surface side of the oil path connection ring 144, and rotate integrally with the swivel base 6.
The oil passage connection ring 144 is connected to the hydraulic equipment on the swivel base 6 side.
Since the surface area of the cylinder 141 is large, connection ports for connecting hydraulic piping members such as various hydraulic hoses or hydraulic pipes connected to the cylinder 141 are provided at appropriate intervals in the circumferential direction and the axial direction. Yes.
The cylindrical body 141 is connected to, for example, a pilot connection port 141j, a hydrostatic transmission 26 connection port 141e connected to the hydrostatic transmission 26, a hydraulic signal connection port 141n, and a brake mechanism A from above. A brake connection port 141h, a power steering cylinder 71 left connection port 141c connected to the steering hydraulic cylinder 71, a power steering cylinder 71 right connection port 141d, a dozer cylinder 78 ascending connection port 141f connected to the dozer cylinder 78, and Dozer cylinder 78 lowering connection port 141b, turning motor 15 connected to turning motor 15 turning right port 141i and turning motor 15 turning port 141g turning left, auxiliary pump 185 connected to auxiliary pump 185 described later Connection port 141k, hydraulic port The main connection port 141m which is connected to the flop 85, the drain connection port 141t and the like to be connected is formed in the hydraulic oil tank 17.

An oil passage is formed in the middle shaft 143 to connect each connection port provided in the cylindrical body 141 to the oil passage connection ring 144 via the radial oil passage and the axial oil passage. The connection ring body 144 is provided with a number of hydraulic pipes 146 that communicate with those oil passages (communication with each connection port provided in the cylinder body 141) corresponding to the connection ports provided in the cylinder body 141. Each hydraulic pipe 146 is connected to each hydraulic device on the swivel base 6 side corresponding to the hydraulic device on the traveling body 4 side connected to the cylindrical body 141 (see a hydraulic circuit described later).
The middle shaft 143 and the oil passage connection ring 144 may be formed integrally.

In the oil passage connection ring 144, it is possible to form a number of connection ports corresponding to the connection ports formed in the cylindrical body 141, and to connect the hydraulic piping members via joints connected to the connection ports. However, by doing so, a connection port forming area similar to that of the cylindrical body 141 is required, and it cannot be stored in a narrow space in the swivel base 6, or a step (floor) which is the upper surface of the swivel base 6 becomes high. There is a problem.
Therefore, in the present embodiment, the hydraulic pipes 146 are distributed in the circumferential direction around the oil passage connection ring 144 (arranged in a octopus shape), and are arranged on the surface of the oil path connection ring 144. Each hydraulic pipe 146 is directly welded and integrated, and the hydraulic pipe 146 extends from the oil path connecting ring 144, and the oil path is connected to a joint portion provided on the distal end side of the hydraulic pipe 146. A hydraulic piping member such as a hydraulic hose and hydraulic piping for connecting the connection ring 144 to the hydraulic equipment on the swivel base 6 side is connected.

With this configuration, the oil passage connection ring 144 can be stored in a narrow space, and the hydraulic piping member can be piped to the oil passage connection ring 144 in the narrow space.
Further, a connection port (opening) is formed on the outer peripheral surface of the oil passage connection ring 144, a joint is attached to the connection port, and a hydraulic piping member such as a hydraulic hose for connecting to a hydraulic device is connected to the joint. If this is done, there is a risk of oil leakage failure at the hydraulic piping member connection portion of the oil passage connection ring 144. However, by directly welding the hydraulic pipe 146 to the oil passage connection ring 144, Oil leakage between the hydraulic connecting ring 144 and the hydraulic pipe 146 is extended from the hydraulic connecting ring 144 and connected to a hydraulic device via a joint at the tip end of the hydraulic pipe 146. By connecting the piping member, the oil passage connecting ring 144 and the hydraulic piping member for connecting the oil passage connecting ring 144 to the hydraulic equipment can be connected in a relatively wide place, and thereby the hydraulic pressure is increased. The tip of the pipe 146 When, the hydraulic pipes 146 can be connected to the hydraulic piping member securely as oil leakage failure does not occur for connection to the hydraulic equipment, also it is easy assembly of hydraulic piping member.

Further, the oil passage connection ring 144 protrudes upward from the swivel bearing 36 and enters the swivel base 6. In particular, the swivel base 6 has left and right rising ribs 35, and the hydraulic pipe 146 is connected to the oil path connection ring. Since it is difficult to protrude (extend) from the body 144 in the left-right direction, each hydraulic pipe 146 is formed to be bent in the shape of a letter from the middle and to face forward and backward.
The hydraulic pipe (octopus pipe) 146 is arranged below the upper surface of the rising rib 35, and an opening 6 a for arranging and accommodating the hydraulic pipe 146 is formed in the swivel base 6.
A through hole 147 is formed in the shaft core 5S of the middle shaft 143, a harness (communication cord) 148 is inserted, and an engagement recess 150 for engaging the coupling 149 is formed on the lower surface of the middle shaft 143. Yes.

A joint cover 151 is detachably attached to the lower portion of the cylindrical body 141 and is attached to the cylindrical body 141 so as not to be rotatable around the pivot axis 5S. A case body 152 is attached and fixed to the upper side of the joint cover 151. An energizing means 145 is disposed between the case body 152 and the joint cover 151.
A fixed energizing member 153 such as a brush is fixed to the joint cover 151 and the case body 152, and the fixed energizing member 153 is in sliding contact with the movable energizing member 154 so as to be energized.

The movable energizing member 154 is provided at the lower part of a rotating shaft 155 concentrically with the central shaft 143 and rotatably supported by the case body 152, and a coupling 149 is provided at the upper portion of the rotating shaft 155 protruding from the case body 152. The coupling shaft 149 is inserted into the engaging recess 150 and engaged with the middle shaft 143, so that the rotating shaft 155 rotates integrally with the middle shaft 143.
One end of the harness 148 is connected to an operating device (electrical device) on the swivel base 6, and the other end is inserted into the rotating shaft 155 and connected to the movable energizing member 154, via the fixed energizing member 153. Communication (energization) is possible with the engine 13 on the traveling body 4 side and the operated equipment such as various electromagnetic control valves.

In the present embodiment, the electrical signals communicated from the swivel base 6 side to the traveling body 4 side via the energization means 145 include, for example, a start / stop command signal for the engine 13 and a forward / reverse switching of the transmission 26. Command signal for switching high / low speed of transmission 16, command signal for switching front and rear dozers 10F, 10R, command signal for ON / OFF of differential lock, command signal for speed up / down, etc. (Refer to the hydraulic circuit described later).
In this embodiment, a multiplex communication system that can process these electric signals by two circuits 148 is employed.

The energization means 145 mainly energizes control signal (communication) electricity, but may supply electric power for driving a motor or the like.
Since the energizing means 145 is provided at the lower part of the swivel joint 5 (because the hydraulic circuit (upper side) and the electric circuit (lower side) are stacked in two vertical directions), the swivel joint 5 and the energizing means 145 Can be configured compactly in the vertical direction.
In FIGS. 1 and 4 to 7, a pair of left and right supports 58 are provided on the upper portion of the work device support portion 37 of the swivel base 6. The support body 58 has a shape in which a horizontal member 58B made of a pipe is horizontally projected from the U-shaped member 58A, the U-shaped member 58A is bolted to the work device support portion 37, and the horizontal member 58B is a pair of left and right lops support portions. Is forming.

The left and right horizontal members 51B of the driver seat frame 51 also form a lops support portion, and the front and rear columns 52F and 52R of the left and right lops 53 are connected to and supported by the horizontal members 51B and 58B positioned at the front and rear. Yes.
The LOPS 53 is formed by bending one pipe material into a substantially U shape from the rear strut 52R to the upper part 52U, and connects the upper part 52U and the upper end of the pipe front strut 52F. A plurality of connecting rods 60 are connected to each other, and a canopy 90 is attached to the upper portion 52U so as to be able to be shaded.

Connecting members 59F and 59R are fixed to the lower ends of the front and rear columns 52F and 52R. Each of the connecting members 59F and 59R has a pipe or solid bar-like connecting portion and an elbow portion for arranging the connecting portion at a right angle to the support column 52. The connecting portions are used as the cross members 51B and 58B. Are inserted into the two and stopped with a bolt that penetrates both of them, so that the lops 53 are attached to the swivel base 6.
The connecting portion may be configured to be fitted and connected to the cross members 51B and 58B, or both may be formed of a plate material or an angle material.

The left and right rear struts 52R are bent in an L shape, rise from the rear wall portion 34 of the swivel base 6 to the rear upper side of the driver's seat 7, and extend upward from the midway portion. In addition, it is formed in a shape projecting upward from the engine 13.
The driver's seat arrangement frame 51 and the driver's seat 7 are arranged at a position higher than the engine 13 and can pass above the engine 13 when the swivel base 6 turns, that is, the bulky shape portion 4B which is the highest position of the traveling body 4 The upper part is allowed to pass.
The engine 13 is mounted on the rear part of the traveling body 4 and the driver's seat 7 is disposed at a position protruding rearward and upward from the swivel base 6, so that the driver's seat 7 is located at the rear part on the swivel base 6 and the control device 8. Is located at the front, the weight of the upper structure 11 is extremely light, and the front and rear dimensions are the minimum necessary dimensions.

Further, the swivel base 6 in front of the driver's seat 7 can be effectively used as a living space, the occupation area of the swivel base 6 is small and arranged at a low position, and the work implement 1 is compact in the front-rear, left-right, and vertical directions. Making it possible to configure.
The steering device 8 has a handle 73 so that it can travel on a high-speed road, and a steering controller 73A of the handle 73 and other devices are mounted on a support 38 standing on the rear side of the work device support portion 37 of the swivel base 6. It can be assembled on a swivel base 6 as a set of assemblies.

That is, as shown in FIGS. 18 to 20, the support body 38 is pivotally supported so that a shift pedal 94 for shifting the hydrostatic transmission 26 is arranged in the vicinity of the right foot rest position in addition to the steering controller 73A. In the vicinity thereof, a brake pedal 91 is pivotally supported, a master cylinder 101 for operating the brake mechanism A and an oil tank 102 are mounted, a damper 103 for a shift pedal 94, a remote control valve 104 for HST, and the like are also mounted. Yes.
A shuttle lever 105 for operating the forward / reverse switching valve 174 is disposed on the handle post 73 </ b> B of the handle 73.

21 and 22 show the hydraulic circuit of the wheel type work machine 1, which is divided into the traveling body 4 side and the upper structure 11 side with the swivel joint 5 as a boundary.
The power of the engine 13 drives the pump 81 of the transmission 26 and simultaneously drives the charge pump 109, and further allows the hydraulic pump 85 to be driven via the reduction gear group 107 and the hydraulic clutch 110.
In the transmission 26, a shuttle valve 170 and a pilot operation valve 171 are provided. The pilot operation valve 171 and the like can be operated by a high / low switching valve 169, and a swash plate control actuator 172 of the motor 82 is operated to operate at high speed and low speed. It is possible to switch to the state.

The pump 81 is connected to a speed actuator 173 for switching forward and backward and speed. The speed actuator 173 is controlled by a speed operating valve 176, and the speed operating valve 176 is operated to switch forward and backward by a forward and backward switching valve 174. The remote control valve 104 operated by the pedal 94 can be controlled.
The hydraulic oil from the charge pump 109 passes through the travel lock switching valve 175 to the remote control valve 104, and is supplied from the remote control valve 104 to one of the front and rear of the forward / reverse switching valve 174, and operates at a speed according to the depression amount of the shift pedal 94. Valve 176 is actuated to control speed actuator 173.

Reference numeral 177 denotes a diff lock, and the hydraulic oil from the charge pump 109 is turned on / off by the diff lock switching valve 178 to switch between the diff lock operation state and the release state.
The hydraulic oil from the hydraulic pump 85 is supplied to the control valve 56, and is sent from the hydraulic control valves 56a to 56g of the control valve 56 to the respective actuators.
An auxiliary pump 185 is connected to the hydraulic pump 85, and hydraulic fluid of the auxiliary pump 185 is supplied to the hydraulic motor 158, and then supplied to the steering hydraulic cylinder 71 via the steering controller 73A.

  The transmission 26, the turning motor 15, the pumps 109, 85, 185, the steering hydraulic cylinder 71, the dozer cylinder 78, the travel lock switching valve 175, the switching valve assembly 54, etc. are disposed on the traveling body 4 side, and the operation device 55, A shift pedal 94, a steering controller 73A, three operation levers 181, 182, 183, a hydraulic motor 158, a control valve 56, and the like are disposed on the upper structure 11 side, and supply of upper and lower hydraulic oil via the swivel joint 5; Discharge is possible, and a control signal is transmitted from the upper structure 11 side to the traveling body 4 side through the energizing means 145 of the swivel joint 5 to control the transmission 26 and other solenoid valves and electrical equipment. It is supposed to be.

As shown in FIG. 27, the switching valve assembly 54 includes the forward / reverse switching valve 174, the travel lock switching valve 175, the differential lock switching valve 178, the high / low switching valve 169, the front / rear dozer switching valve 197, and the steering steering direction switching valve 178. These switching valves 174, 175, 178, 169, 197, 178 are constituted by electromagnetic valves.
The forward / reverse switching valve 174 is disposed on the left side, the travel lock switching valve 175 is disposed on the rear side on the right side, the differential lock switching valve 178 and the height switching valve 169 are disposed on the front side on the right side, and the front / rear dozer switching valve 197 is in the left-right direction. The steering steering direction switching valve 178 is disposed on the front side of the center in the left-right direction.

The front / rear dozer switching valve 197 switches a circuit so as to selectively control the dozer cylinder 78 of one of the front / rear dozers 10F, 10R by a hydraulic control valve 56g for controlling the dozer cylinder 78. The valve 178 switches the circuit between a state in which the steering direction of the steering wheel and the turning direction of the traveling body 4 are the same and a state in which the steering direction of the steering wheel and the turning direction of the traveling body 4 are opposite.
The switching valve assembly 54 is attached to the mounting plate 50 between the left and right side frames 22 of the vehicle body frame on the rear side of the front axle case 63F, and on the upper side of the front axle case 63F and on the left and right sides. Since it is disposed between the side frames 22 and the upper space of the switching valve assembly 54 is open (there is no obstruction above the switching valve assembly 54), The maintainability of each switching valve 174, 175, 178, 169, 197, 178, which is a component, is improved, and the switching valve assembly 54 is protected by the front axle case 63F, the left and right side frames 22, and the like. It is illustrated.

In addition, it is preferable to cover the upper surface side of the arrangement space of the switching valve assembly 54 with a detachable cover body.
The wheel-type working machine 1 described above preferably includes all of the components, but can be partially selected and used or can be appropriately combined.
For example, a traveling body 4 having front and rear four wheels 2 and 3 is provided with a traveling drive device 12 and a dozer 10, and a swivel base 6 is provided at a position lower than the highest position of the traveling body 4 so as to be capable of turning all around. 6 is provided with an upper structure 11 having a driver's seat 7 and a control device 8 and a ground work device 9, and a basic configuration is made.
(A) The upper structure 11 and the ground work device 9 mounted on the swivel base 6 are allowed to pass above the engine 13.
(B) The traveling body 4 has a structure in which the lower part of the swivel base 6 is a flat part 4A and the rear part of the swivel base 6 is a bulky part 4B.
(C) The engine 13 is disposed at the rear part of the traveling body 4, and the swivel base 6 is disposed below the upper end of the engine 13.
(D) At least the swivel bearing 36 of the swivel bearing 36 and the swivel base 6 is disposed between the front and rear wheels 2 and 3 and at a position lower than the upper end of at least one of the front and rear wheels 2 and 3.
(E) The work device support part 37 is disposed within a substantially outer periphery of the swivel base 6.
(F) The driver's seat 7 protrudes backward from the swivel base 6;
(G) The base portion of the ground work device 9 supported by the work device support portion 37 is disposed at a higher position than the front and rear wheels 2, 3 and the engine 13.
At least one of equal configurations may be provided.

Also, in their configuration,
(H) The fuel tank 16 is provided on the left and right sides of the traveling body 4, and the hydraulic oil tank 17 and the battery 18 are provided on the left and right sides, respectively.
(J) The body frame 21 of the traveling body 4 has a ladder structure and the front and rear wheels 2 and 3 are suspended.
(K) A front working device support portion 37, a rear rear wall portion 34, and left and right rising ribs 35 connecting them are integrally provided on the upper surface of the traveling body 4.
(M) The engine 13 is disposed in the bulky shape portion 4B of the traveling body 4, and the power transmission mechanism 14 is disposed in the flat shape portion 4A.
(N) The hydrostatic transmission 26 and the speed reducer 87 are used in combination with the power transmission mechanism 14, and the input shaft 27, the output shaft 28, and the propulsion shaft 114 of the transmission 26 are substantially aligned in the front-rear direction and separated in the left-right direction. Deploy,
(P) At least the swivel bearing 36 of the swivel bearing 36 and the swivel base 6 is disposed between the front and rear wheels 2 and 3 and at a position lower than the upper end of at least one of the front and rear wheels 2 and 3.
(Q) The rear part of the turntable 6 is close to the engine 13 and the front part overlaps the front wheel 2 in the front-rear direction.
(R) The swivel base 6 is formed in a substantially circular shape in plan view.
(S) A swing shaft 39 is supported by the work device support portion 37, a swing body 40 that is swung by a swing cylinder 41 is pivotally supported on the swing shaft 39, and a boom 42 is supported on the swing body 40 via a horizontal shaft 48. And a boom cylinder 43 that lifts and lowers the boom 42 is pivotally supported.
(T) The swing body 40, the boom 42, and the boom cylinder 43 are set to a height at which the swing body 40, the boom cylinder 43, and the upper position of the traveling body 4 can pass.
(U) The front part of the swing body 40 is protruded radially outward from the swivel base 6;
(W) The operating device for the ground work device includes a hydraulic control valve for controlling some of the switching valves of the hydraulic device, a manual operating means for operating the hydraulic control valve, and some of the switching valves of the hydraulic device. Foot control means to control,
(X) A driver seat arrangement frame 51 is provided on the swivel base 6, and the rear portion of the driver seat arrangement frame 51 projects rearward from the swivel base 6, and the driver seat 7 and the operation device 55 are arranged on the rear projecting portion. The driver's seat 7 and the operation device 55 are allowed to pass above the traveling body 4 when the swivel base 6 is turned.
(Y) The cross members 58B... Are respectively attached to the front work device support portion 37 and the rear driver seat arrangement frame body 51. 51B is provided, the front and rear lower ends of the lops 53 are connected to the front and rear cross members 58B and 51B, and the canopy 90 is provided between the upper portions of the lops 53.
(Z) The dozer 10 is mounted on both the front and rear of the traveling body 4.

Further, the basic configuration of the wheel type work machine 1 is set to at least turn among the swivel base 6, the driver's seat 7, the control device 8 and the ground work device 9 with respect to the weight of the traveling body 4 having the front and rear wheels 2 and 3. Even when a configuration in which the total weight of the platform 6, the driver's seat 7 and the control device 8 is set lightly is added, the distance L1 from the turning shaft 5 to the rear end of the upper structure 11 is set to the rear wheel. Even when a configuration or the like that is substantially within the distance L2 to the rear end of 3 is added, the combination can be performed in the same manner.
The wheel type work machine 1 is suitable for efficiently performing grading work on sloping terrain where the skid steer loader is not good, or in a narrow field, and can also work to scrape the soil while moving, We are good at working methods of scraping soil by using it, and by changing work tools 46 of different widths, both transportation work and groove excavation work of 1.8 m or less such as electric wire burial can be performed with one unit.

In other words, the work using the machine in leveling work is roughly divided into transportation and grading. The wheel type work machine 1 is inclined and swelled on the ground, leveled, scraped the soil, filled with grooves and holes. Grading work that is soil transfer work other than transportation, such as returning, can be performed particularly efficiently.
In the present invention, the shape of each member and the positional relationship between the front, back, left, and right in the above embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.

For example, instead of a four-column type ropse device that connects the left and right ropses 53 to each other, a two-column type ropse device or a cabin device is mounted, the operating device 55 is arranged in the vicinity of the handle 73, or a driven wheel is installed. A wheel type may be used, and the driving wheel may be replaced with a crawler device.
Further, in the working machine 1 according to the present embodiment described in detail above, the swivel base 6 is disposed at a position lower than the highest position of the traveling body 4 so that the swivel base 6 can be swung around the entire circumference. The ground work device 9 can be supported on the front side of the turntable 6 and can be swung to the left and right, and the running stability, ground work stability, and turning can be increased. Workability, downsizing and downsizing, downsizing and downsizing, ease of getting on and off, securing of living space or simplification of configuration can be achieved.

It is a partial cross section side view showing the whole embodiment of the turning work machine of the present invention. It is an identical part sectional top view. It is a partial cross section top view of the center part. It is a partial cross section side view of the center part. It is the same section sectional front view. It is a whole front perspective view. FIG. FIG. It is a top view of a body frame. It is a side view of a body frame. It is a cross-sectional rear view of a rear-wheel racking apparatus. It is a cross-sectional top view of a transmission. It is a cross-sectional side view of a traveling transmission system. It is a top view of a traveling body center part. It is a front view of a hydraulic oil tank. It is sectional drawing of the whole swivel joint. It is sectional drawing of a swivel joint lower part. It is a perspective view of a front part of an upper structure. It is a rear view of a steering device. It is a side view of a control device. It is a hydraulic circuit diagram of the whole working machine. It is a hydraulic circuit diagram of a transmission. It is a side view of an upper structure. It is a top view of an upper structure. It is a top view of the rear left part of an upper structure. It is a top view of the rear part right side of an upper structure. It is a top view of a running body front part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Traveling body 5S Turning axis 6 Turning base 7 Driver's seat 9 Ground working apparatus 12 Travel drive apparatus 13 Engine 14 Power transmission mechanism 16 Fuel tank 17 Hydraulic oil tank 36 Turning bearing 56 Control valve 56a-g Hydraulic control valve 85 Hydraulic pump 55L Operation lever 55R Operation lever 158 Hydraulic motor 159 Generator 160 Battery 181 Operation lever 182 Operation lever 183 Operation lever 193 Remote control valve 194 Remote control valve 195 Remote control valve 200A-C Link (rod)

Claims (4)

A swivel base (6) is provided on the traveling body (4) so as to be pivotable about the vertical axis, and the traveling body (4) is provided with an engine (13), a hydraulic pump (85), and a power transmission mechanism (14). A driver's seat (7) provided with a drive device (12), a fuel tank (16), and a hydraulic oil tank (17), disposed on the swivel base (6) side at the rear of the swivel base (6); The control valve (56) is formed by integrating the ground work device (9) disposed in front of the driver seat (7) and the hydraulic control valves (56a to 56g) for controlling the hydraulic equipment provided in the turning work machine. And the control valve (56) is arranged behind the driver seat (7) ,
Each hydraulic control valve (56a-g) constituting the control valve (56) is constituted by a direct acting spool type switching valve, and each hydraulic control valve (56a-g) is in a direction perpendicular to the spool and in the front-rear direction. A swivel work machine characterized by being arranged side by side and connected to each other .   An operation lever (55L, 55R, 181, 182, 183) for operating each hydraulic control valve (56a to 56g) of the control valve (56) is disposed on the front side of the driver seat (7). The turning work machine according to claim 1.   A remote control valve (194, 193, 195) for operating the hydraulic control valves (56a, 56b, 56g) by pilot pressure is arranged on the side of the control valve (56), and the remote control valve (194, 193, 195) is operated. The swivel working machine according to claim 1 or 2, characterized in that it is interlocked and connected via an operation lever (182, 181, 183) on the side of the seat (7) and a link (200A, 200B, 200C). A generator (159) behind the driver seat (7) of the swivel base (6), a hydraulic motor (158) for driving the generator (159), and a battery for storing electricity generated by the generator (159) ( 160) . The turning work machine according to any one of claims 1 to 3, wherein:

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