JP2003285650A - Wheel type work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the location of a turning base lower than the upper end of an engine by loading the engine on the rear part of a running body behind the turning base. <P>SOLUTION: On the running body 4 having front and rear wheels 2 and 3, a running-driving apparatus 12 having the engine 13 is provided. On the running body 4, the turning base 6 is provided through a turning shaft 5 and a turning bearing 36. On the turning base 6, an operating seat 7, an operating device 8 which is arranged in front of the operating seat 7, and a ground work device 9 which is arranged near the device 8 are provided. Then, the engine 13 is arranged at the rear part of the running body 4, and the turning base 6 is arranged to be lower than the upper end of the engine 13. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel type working machine having front and rear wheels and a turning ground working apparatus.

[0002]

2. Description of the Related Art In the prior art of this type, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Application No. 01-97017, a swivel base is provided on a traveling body having front and rear wheels via a swivel shaft, and an upper structure having a driver's seat and a control device is mounted on the swivel base. The engine is mounted on a swivel base as a part of the upper structure, and the driver's seat is arranged right above the swivel axis.

[0003]

In the above-mentioned prior art, the front and rear wheels can travel on a high speed road, and ground work such as excavation can be performed while turning the ground work device and raising and lowering the work implement, but the engine turns. Since it is mounted on a table, the upper part of the upper structure bulges greatly, the distance from the turning axis to the rear end is extremely long, and the rear end projects further from the rear end of the rear wheel, making it narrow. Turning work in places is very difficult. In addition, since the engine is mounted on the swivel base, the center of gravity of the machine is relatively high, which makes it difficult to improve running stability.
Since the mass of the upper structure is high, it is difficult to improve the turning workability.

By the way, conventionally, it is considered that mounting an engine on a traveling body raises the position of the swivel base and deteriorates both traveling stability and swivel workability. Therefore, the engine is mounted on the swivel base. It is common sense to mount it on. It is an object of the present invention to provide a wheel type working machine capable of solving the problems of the conventional art. An object of the present invention is to provide a wheel type working machine in which an engine is mounted on a rear portion of a traveling body behind a swivel so that the position of the swivel can be made lower than an upper end of the engine.

[0005]

A first specific means for solving the problems in the present invention is to provide a traveling drive unit 12 having an engine 13 on a traveling body 4 having front and rear wheels 2 and 3, and to provide this traveling body. 4, a swivel base 6 is provided via a swivel shaft 5 and a swivel bearing 36, a driver's seat 7 is mounted on the swivel base 6, a control device 8 arranged in front of the driver seat 7, and a control device 8 of the control device 8. It is provided with the ground work device 9 arranged in the vicinity, the engine 13 is arranged at the rear part of the traveling body 4, and the swivel base 6 is arranged below the upper end of the engine 13.

As a result, the swivel base 6 can be arranged at a low position in the state where the engine 13 is mounted on the traveling body 4, and traveling stability and work stability can be improved. A second specific means for solving the problems in the present invention is, in addition to the first specific means, at least the slewing bearing 36 in the slewing bearing 36 and the slewing base 6 between the front and rear wheels 2 and 3. In addition, it is arranged at a position lower than the upper ends of at least one of the front and rear wheels 2, 3. As a result, the swivel base 6 can be arranged at a lower position with the engine 13 mounted on the traveling body 4, and traveling stability and work stability can be further improved.

The third specific means for solving the problems in the present invention is, in addition to the first or second specific means, that the turning shaft 5 is located in front of the center P between the front and rear wheels 2, 3. Is what you are doing. As a result, the engine 13 can be arranged at the rear portion of the traveling body 4, and the dimension of the traveling body 4 in the front-rear direction can be reduced. The fourth concrete means for solving the problem in the present invention is, in addition to any one of the first to third concrete means, the engine 13 when the driver's seat 7 and the ground work device 9 on the turntable 6 are turned. It is arranged so that it can pass above.

As a result, the swivel base 6 can be swung around the entire circumference for ground work and the work performance can be improved. The fifth concrete means for solving the problems in the present invention is, in addition to any one of the first to fourth concrete means, a rear portion of the swivel base 6 is close to the engine 13, and a front portion is a front wheel 2. That is, they overlap in the front-back direction. As a result, the swivel base 6 can be formed as large as possible, or the traveling body 4 can be configured as compact as possible.

A sixth concrete means for solving the problems in the present invention is that in addition to any one of the first to fifth concrete means, the swivel base 6 is formed in a substantially circular shape in a plan view. Is. As a result, even if the swivel base 6 turns, the swivel base 6 can be formed as large as possible without colliding with surrounding objects. A seventh concrete means for solving the problems in the present invention is the traveling body 4 in addition to the concrete means according to any one of the first to sixth aspects.
Between the front and rear wheels 2 and 3 is a fuel tank 16 on the left and right sides.
The hydraulic oil tanks 17 are respectively provided on the left and right sides, and the fuel tank 16 and the hydraulic oil tank 17 overlap the swivel base 6 in the left-right direction and project outward from the swivel base 6 in the left-right direction. Is.

As a result, the fuel tank 16 and the hydraulic oil tank 17 can be arranged on the side of the traveling body 4 and by utilizing the space between the front and rear wheels 2, 3 and can have a large capacity. Good left / right balance.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 10, the wheel type working machine 1 is roughly classified into a four-wheel type traveling body 4 having front and rear wheels 2 and 3, a revolving base 6 provided on the traveling body 4 via a revolving shaft 5, and An upper structure 11 having a driver's seat 7 and a control device 8 thereon, a ground work device 9 provided on the swivel base 6, and a stabilizer 10 provided at a front portion of the traveling body 4 are provided.

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 suspends the front wheels 2, and a rear wheel device 61R that suspends the rear wheels 3. And so on. The traveling body 4 has the side on which the engine 13 is mounted is referred to as the front and the opposite side with the stabilizer 10 mounted is referred to as the rear, and the control device 8 is arranged in front of the driver's seat 7. 3, 5, and 7, the body frame 21 includes plate-shaped front and rear frames 23F and 23R which are formed by connecting front and rear portions of a pair of left and right plate-shaped side frames 22.
The engine 13 is arranged in the rear part of the body frame 21 and connected to the left and right side frames 22, and the radiator 62 is mounted on the rear part of the left and right side frames 22. There is.

The front wheel device 61F accommodates a front wheel differential device 64F in a cylindrical front axle case 63F, and a center pin 65F in the front-rear direction is provided at the center of the front axle case 63F in the left-right direction to the lower front portion of the vehicle body frame 21. The left and right ends are supported so as to swing up and down. A final transmission case 67F is provided at the left and right ends of the front axle case 63F so as to be swingable around the kingpin 66F, the front wheel 2 is attached to a wheel shaft 68F supported by the final transmission case 67F, and the final transmission case 67F is mounted by the front steering means 69F. The left and right front wheels 2 can be steered via.

Similar to the front wheel device 61F, the rear wheel device 61R has a rear wheel differential device 64 in a cylindrical rear axle case 63R.
The R is housed, and the center of the rear axle case 64R in the left-right direction is supported by the center pin 65R in the front-rear direction of the lower rear portion of the vehicle body frame 21 so that the left-right ends swing up and down. King pins 66 on the left and right ends of the rear axle case 63R
A final transmission case 67R is provided so as to be swingable around R, the rear wheel 3 is attached to a wheel shaft 68R supported by the final transmission case 67R, and the left and right rear wheels 3 are steered by the rear steering means 69R via the final transmission case 67R. It is possible.

Each of the front and rear steering means 69 includes a hydraulic cylinder 71 provided on the axle case 63, and the hydraulic cylinder 71.
Both ends of the piston rod 71a and the left and right final transmission case 67
And a tie rod 72 for connecting the two. The left and right final transmission cases 67 are rotated around the king pin 66 by the left and right movements of the piston rod 71a to steer the wheels 2 and 3. In the traveling body 4, power is transmitted from the traveling drive device 12 to the front wheel differential device 64F and the rear wheel differential device 64R.
It is a four-wheel drive type, and is a four-wheel steering type in which front and rear wheels 2 and 3 are steered in opposite directions (or may be in the same direction) through front and rear steering means 69F and 69R by steering one handle 73. There is.

However, the traveling body 4 may have a structure in which only one of the front and rear wheels 2, 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. Only one of them may be constantly driven and constantly steered, and the other may be appropriately driven or steered. Although the front and rear wheels 2 and 3 have substantially the same diameter, one of the front and rear wheels may have a large diameter and a different diameter. 1, 2, 5, 6
In the left and right side portions (side portion frame 22) of the traveling body 4, the fuel tank 16 is attached to one left and right side (left side) between the front and rear wheels 2 and 3, and the hydraulic oil tank is attached to the other left and right side (right side). 17 and a battery 18 behind it. The fuel tank 16 and the hydraulic oil tank 17 may be reversed left and right, and by arranging them separately on the left and right sides, the weight balance between the left and right of the traveling body 4 is improved and the space between the front and rear wheels 2, 3 is effectively used. ing.

At the front portion (front frame 23) of the traveling body 4,
In order to mount the stabilizer 10, a pair of left and right arm support parts 74 and a cylinder support part 75 at the center upper part are formed in a forward protruding shape. The stabilizer 10 is supported by a blade 76, a pair of left and right arms 77 attached to the blade 76 and pivotally supported by the arm support portion 74 so as to be vertically movable around a horizontal axis, and the stabilizer 10 is pivotally supported by the cylinder support portion 75. It has an operating cylinder 78 for moving up and down, and the blade 76 can be brought into contact with the surface of the earth or can be thrust into the ground.

Although this stabilizer 10 is opposite to the side of the traveling body 4 on which the engine 13 is arranged, it may be arranged on the same side as the engine 13 or on the rear side of the traveling body 4. This stabilizer 10 has substantially the same structure and substantially the same function as the dozer device of the backhoe, but when excavation work by the ground work device 9 is the main work, the traveling body 4
Its main function is as a stabilizer (outrigger). A cover 24 that covers the upper surface of the traveling body 4, the front and rear wheels 2, 3, the fuel tank 16, the hydraulic oil tank 17, the battery 18, and the like is attached to the vehicle body frame 21.
The cover 24 may be made of synthetic resin, but is preferably made of a relatively thick iron plate and also serves as a weight for stabilizing the traveling body 4 during ground work.

As shown in FIGS. 2, 4, 9, and 10, the cover 24 has a substantially rectangular shape in a plan view, and the front portion has a concave shape having a concave portion 24B between the fender portions of the left and right front wheels 2.
It is lower than the uppermost portion of the front wheels 2 so as not to interfere with the ground work device 9 during forward excavation, and the fender portions of the front and rear wheels 2, 3 are also concave, and the fuel tank 16 and The left and right side portions that cover the hydraulic oil tank 17 are step portions 24A for getting on and off the swivel base 6.
That is, the cover 24 also serves as a fender, a weight, and a step, and the worker can ride not only the step portion 24A but also any portion on the step portion 24A.

In the traveling body 4 having the cover 24, the lower portion of the swivel base 6 is a flat-shaped portion 4A and the rear portion of the swivel base 6 is a bulky-shaped portion 4B, and the bulky-shaped portion 4B has a cover 24. A bonnet cover 80 forming a part of is attached detachably or openably. 80a is an air hole formed in the bonnet cover 80. The engine 13 is arranged in the bonnet cover 80 of the bulky shape portion 4B of the traveling body 4, and the power transmission mechanism 14 is arranged in the flat shape portion 4A. The swivel base 6 is arranged above the flat-shaped portion 4A having the power transmission mechanism 14 built therein, and the engine 13 has a disposition structure projecting from below the swivel base 6.

The engine 13 may be arranged such that the axis of the crankshaft 13A is arranged in the left-right direction, but here it is arranged along the front-rear direction, and the center 13S in the left-right direction is the center of the body frame 21 in the left-right direction (the turning axis). It is arranged so as to deviate to the left or right (the left side) from the center line 5S of 5). The radiator 62 arranged on the rear side of the engine 13 may be arranged at the center of the body frame 21 in the left-right direction, but is arranged on the same side as the engine 13 while being offset. Therefore, the center of gravity of the traveling body 4 is slightly deviated to the left side, which is the left-right reversal of the arrangement of the ground work device 9 described later.

The power transmission mechanism 14 of the flat-shaped portion 4A may be a mechanical transmission, but here, a hydrostatic transmission 26 having a pump 81 and a motor 82 is adopted.
In the transmission case 83, the input shaft 27 on the side of the pump 81 and the output shaft 28 on the side of the motor 82, to which power is transmitted from the engine 13, are supported, and these are arranged substantially in the front-rear direction, and the left and right sides of the body frame 21. It is deviated from the center of the direction and is placed separately on the left and right sides. The input shaft 27 projects forward and backward from the transmission case 83, the rear side is connected to the crankshaft 13A via a flywheel, and the front side is hydraulic pump 8 for supplying hydraulic oil via a pair of gears 84.
5 is driven.

The output shaft 28 projects forward and backward from the mission case 83, and the front and rear universal joint shafts 29F and 29R are provided.
Via the bevel pinion shafts 86F and 86R of the front wheel differential device 64F and the rear wheel differential device 64R.
Front and rear universal joint shafts 29F, 2 for power transmission to the front and rear wheels 2, 3.
Center pin 65F, 65R by using 9R
Even if it is displaced from the left to the right in the left-right direction, the front and rear axle cases 63F and 63R are allowed to swing up and down. 2 to 6, a swivel shaft 5 and a swivel bearing 36 that swivelly support the swivel base 6 on the traveling body 4, a ring gear 88 provided on the inner circumference of the swivel bearing 36, and the ring gear 88 mesh with each other. A driving pinion 89 and a hydraulic turning motor 15 that drives the driving pinion 89 to turn the turntable 6 are provided.

The swivel shaft 5 arranged at the center 5S of the swivel bearing 36 is composed of a swivel joint, and a hydraulic pump 85
The hydraulic oil passage connecting the working device 9 with the ground work device 9 and the wiring connecting the control device 8 and the traveling drive device 12 can be connected even when the swivel base 6 is rotating. The turning motor 15, the universal joint shaft 29, the hydraulic pump 85, and the like constitute a part of the power transmission mechanism 14 of the traveling drive device 12, and are housed substantially within the vertical width of the vehicle body frame 21, and the turning shaft 5 has The surroundings are compactly arranged in the up-down direction as well as in the front-rear direction and the left-right direction.

The swivel base 6, the driver's seat 7 arranged on the upper rear part of the swivel base 6 of the swivel shaft 5, the control device 8 arranged in front of the driver's seat 7 on the front part of the swivel base 6, and the like. The structure 11 is configured. The center 5S of the swivel axis 5 is
The front and rear wheels 2, 3 are arranged slightly in front of the center P between the axes, and the driver's seat 7 is located on the rear side of the turntable 6 with the turning axis 5 as a boundary, and the control device 8 and the ground work device 9 are located on the front side. Since the upper structure 11 is provided with the steering device 8 at the front end and the driver's seat 7 at the rear part and there is no large load behind it, the size in the front-rear direction is extremely short.

In the upper structure 11, the swivel bearing 36 and the swivel base 6 are 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 is It is arranged between 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, 3. The swivel base 6 has a substantially circular shape in a plan view, a rear portion thereof is close to the engine 13, and a front portion thereof is disposed so as to overlap the left and right front wheels 2 in the front-rear direction. The swivel base 6 projects outward from the body frame 21 to the left and right, and the fuel tank 1
6 and the hydraulic oil tank 17 in the horizontal direction.

That is, the swivel base 6 is set so as to have an area as large as possible within three points of the engine 13 at the substantially center in the left-right direction and the pair of left and right front wheels 2. The size of the running body 4 in the front-rear direction and the left-right direction is set to be compact after the platform 6 has a required area. Further, since the traveling body 4 is equipped with the engine 13, the fuel tank 16, the hydraulic oil tank 17, etc., the traveling body 4 becomes heavier by that amount, and the weight on the side of the upper structure 11 is reduced, and It is compact both in the front-back direction and in the left-right direction.

As a result, with respect to the weight of the traveling body 4 having the front and rear wheels 2 and 3, the swivel base 6 and the driver seat 7 above the swivel base 6,
It is possible to set the total weight of the control device 8 and the ground work device 9, at least the total weight of the swivel base 6 and the driver's seat 7 and the control device 8 on it. 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 are set so that the weight balance around the turning shaft 5 becomes good. There is.
That is, in the working machine 1, the engine 13 is arranged on the traveling body 4 and the traveling body 4 is equipped with the engine 13 in order to lower the center of gravity of the traveling body 4 and achieve traveling stability, work stability, and the like. However, in order to place the swivel base 6 in a lower position, the engine 1
3 is arranged at the rear of the traveling body 4, and the power transmission mechanism 14
Is arranged in front of the engine 13 to reduce the vertical dimension of the traveling body 4 below the swivel base 6.

The distance L1 from the center 5S of the turning shaft 5 to the rear end of the upper structure 11 is determined by the distance from the center 5S of the turning shaft 5 to the rear wheel 3.
The distance is approximately within the distance L2 to the rear end, and at least within the distance L3 from the center 5S of the turning shaft 5 to the rear end of the traveling body 4. As a result, even if the upper structure 11 turns, it does not collide with an obstacle behind. A driver seat arrangement frame body 51 is provided on the swivel base 6. The driver's seat arrangement frame body 51 includes a lops 53 having left and right front and rear columns 52F and 52R that are erected from the swivel base 6, and the lops 53.
Support members 54 provided between the lower part of the left and right rear columns 52R and the swivel base 6, and a canopy 90 provided on the upper part of the lops 53.
And the driver's seat 7 is attached to the rope 53 and / or the support member 54. The rope 53 is made of a pipe material.

The lower portions of the left and right rear columns 52R are bent into an S shape or an L shape, and after the rear portion of the driver seat arrangement frame body 51 behind the turning shaft 5 is extended upward from the turning base 6. It is formed so as to project rearward and above the engine 13. Therefore, the driver's seat 7 is arranged at a position higher than the engine 13, and can pass above the engine 13 when the swivel base 6 turns, that is, above the bulky upper portion 4B which is the highest position of the traveling body 4. ing. By mounting the engine 13 on the rear part of the traveling body 4 and arranging the driver's seat 7 at a position projecting rearward and upward from the swivel base 6, the driver's seat 7 is located at the rear part on the swivel base 6 and the control device 8 is provided. Is located in the front portion, the weight of the upper structure 11 is extremely light, and the front-rear dimension is the minimum necessary dimension.

The swivel base 6 in front of the driver's seat 7 can be effectively used as a living space, and the occupation area of the swivel base 6 is small and arranged at a low position, so that the working machine 1 is moved in the front-rear, left-right and up-down directions. It becomes possible to make it compact in. An operation device 55 for a ground work device is supported by the lops 53 or the support member 54 on the left and right sides of the driver's seat 7. The left and right operation device 55 connects the swing cylinder 41, the boom cylinder 43, the arm cylinder 45, the work tool cylinder 47, and the like of the ground work device 9 described later to the levers 55L and 55L.
It is operated by R, and the posture can be freely changed from the operation posture (shown in FIGS. 1 and 2) to the retracted posture in which the worker is tilted rearward to get on and off the driver's seat 7 when operating. There is.

A control valve 56 and a counterweight 57 may be provided on the rear portion of the driver seat arrangement frame 51, and the support member 54 may be fixed to the rope 53 itself. The control device 8 is capable of running on a high speed road,
A steering wheel 73 for operating the steering means 69 is provided, and a steering controller 73A of the steering wheel 73 is attached to a support body 38 standing on the swivel base 6. In addition, the support 38
A brake pedal 91 is pivotally supported, a speed change pedal 94 for changing the speed of the hydrostatic transmission 26 is arranged in the vicinity of the right foot rest position, and means for configuring another control device 8 is provided in the vicinity thereof.

At the front part of the swivel base 6, there is provided a working device support portion 37 for supporting the ground working device 9 on the upper side of the swivel base 6 so as to be swingable left and right. The control device 8 is arranged in the front-rear portion of the swivel base 6 substantially in the center in the left-right direction (may be displaced to the left side), whereas the working device support portion 37 is displaced to the right side, The working state of the ground work device 9 is made easy to see. As described above, since the ground work device 9 on the swivel base 6 is deviated to the right side, the engine 13 is deviated to the left side in order to correct the left-right balance of the work machine 1 as much as possible.

The working device support portion 37 supports the swing shaft 39 by the swivel base 6 and the support 38 standing on the swivel base 6. The supporting body 38 is formed by using an arc-shaped plate material that is long in the left-right direction so as to cover the front portion of the swivel base 6, and the portion of the supporting body 38 facing the swing shaft 39 is recessed inward of the swivel base 6. In other words, the swing body 40 arrangement space is formed, the stay 38A is projected from the support body 38 to support the upper portion of the swing shaft 39, and the working device support portion 37 is formed by these. A swing body 40, which is swung by a swing cylinder 41, is pivotally supported on a swing shaft 39.
A boom 42 and a boom cylinder 43 for raising and lowering the boom 42 are pivotally supported via horizontal shafts 48A and 48B.

In the upper part of the swing body 40, the part pivotally supporting the boom 42 is located within the outer circumference of the swivel base 6, while the front upper part pivotally supporting the boom cylinder 43 is It projects radially outward from the outer circumference of the swivel base 6. The working device support portion 37 is arranged so as to fit within a substantial range of the outer circumference of the swivel base 6, and the height of the working device support portion 37 is set so that the boom 42 and the boom cylinder 43 are at the highest position of the traveling body 4 (the upper end of the hood cover 80). The height is set so that it can pass above. The swing cylinder 41 is arranged on the upper side of the swivel base 6 and can pass over the swivel shaft 5 when swinging the swing body 40. In this way, by arranging the swing cylinder 41 so that it can pass above the turning shaft 5, a long swing cylinder 41 can be adopted, and the swing angle of the swing body 40 can be made sufficiently large.

Since the swing cylinder 41 is located at the footrest of the driver seated in the driver's seat 7, a foot cover 93 is provided to cover the swing cylinder 41 while allowing it to swing. The swing body 40, which pivotally supports the boom 42 and the boom cylinder 43, has a front upper portion projecting radially outward from the swivel base 6, and is located rearward of the front axle 68F of the front wheel 2 in the forward posture. The base of the boom cylinder 43 below the boom 42 is the engine 1
3 (upper end of the bonnet cover 80), so that the boom cylinder 43 does not come into contact with the bonnet cover 80 when the boom cylinder 43 is in a posture above the horizontal posture even when the boom 42 is rotated backward. Has become.

That is, the ground work device 9 on the swivel base 6 is constructed so as not to collide with the traveling body 4 side even when swiveling, so that the ground work can be performed with the swivel base 6 in the backward posture, and the traveling body 4 can be operated.
It enables excavation work around the entire circumference. The ground work device 9 has an arm 44 that can be vertically swung by an arm cylinder 45 at the tip of the boom 42.
A work tool (bucket or the like) 46 that can be vertically swung by a work tool cylinder 47 is provided at the tip of the. The arm 44
Has a bifurcated tip in the left-right direction and has a wide working tool 46
Can be installed stably. The working tool 46 has a pair of left and right arm connecting portions 46A and one central cylinder connecting portion 46B on the back surface, and the arms 44 are provided on the left and right arm connecting portions 46A.
The bifurcated tip is pin-connected, and the work implement cylinder 47 is pin-connected to the cylinder connecting portion 46B via a link, so that the scooping operation and the dumping operation can be performed.

FIG. 11 shows a first modification of the connecting structure of the arm 44 and the working tool 46. The working tool 46 has an auxiliary connecting part 46C formed on the rear surface thereof outside the left and right of the arm connecting part 46A. A reinforcing member 95 is connected between the left and right auxiliary connecting portions 46C and the arm 44, and the work tool 46 having a wider width is provided.
To allow more stable wearing. FIG. 12 shows a second modification of the connecting structure of the arm 44 and the work tool 46. The left and right arms 44L and 44R at the forked ends of the arm 44 are shown in FIG.
Is pivotally supported via the pin 96 with respect to the base member 44A of the arm 44 to enable expansion and contraction.

The left and right arms 44L and 44R are connected at their tips to the arm connecting portion 46A of the work implement 46 via a ball joint, and at their bases via a pin 96 a base member 44 of the arm 44.
It is pivotally supported by A and has expansion / contraction setting portions 97L and 97R integrally. Expansion / reduction setting unit 9 for the left and right arms 44L and 44R
7L and 97R are overlapped with each other, and a pin hole 98 that can be arranged concentrically with the overlapped portion and the base member 44A of the arm 44.
Have. The arm 44 sets the enlargement / reduction dimension of the left and right arms 44L and 44R, and the enlargement / reduction setting unit 9 overlapping in that state.
The setting pin 99 is inserted into the pin holes 98 of 7L and 97R, and the setting pin 99 is inserted into the pin hole 9 of the base member 44A of the arm 44.
The left and right arms 44L and 44R are fixed to the expanded and contracted dimensions by being inserted and fixed in the position 8.

By allowing the left and right arms 44L and 44R to be expanded and contracted in this way, the work tools 46 having different widths can be replaced and the work tools 46 of each width can be stably mounted. Wheel type working machine 1 mentioned above
Preferably comprises all of the components,
It can be partially selected and adopted, or can be appropriately combined. For example, the traveling body 4 having the front and rear four wheels 2 and 3 is provided with the traveling drive device 12 and the stabilizer 10, and the swivel base 6 is capable of making a full turn to a position lower than the highest position of the traveling body 4.
The upper structure 11 having the driver's seat 7 and the control device 8 and the ground work device 9 are provided on the swivel base 6 to form a basic structure, and (a) the upper structure 11 mounted on the swivel base 6 and Enabling the ground work device 9 to pass above the engine 13,
(B) In the traveling body 4, the lower portion of the swivel base 6 is a flat-shaped portion 4A.
In addition, the rear portion of the swivel base 6 has a bulky shape portion 4B, (c) the engine 13 is arranged at the rear of the traveling body 4, and the swivel base 6 is arranged below the upper end of the engine 13 (d).
At least the swivel bearing 3 of the swivel bearing 36 and the swivel base 6.
6 is arranged between 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, 3.
Is located within a substantially outer circumference of the swivel base 6, (f) the driver's seat 7 is projected rearward from the swivel base 6, (g) the base of the ground work device 9 supported by the work device support portion 37. Can be provided at a position higher than the front and rear wheels 2, 3 and the engine 13, and the like.

In addition to these configurations, (h) a fuel tank 16 is provided on one side of the traveling body 4 and a hydraulic oil tank 17 is provided on the other side of the traveling body 4, respectively. The front and rear wheels 2 and 3 are suspended, and (k) a cover 24 that serves both as a weight and as a step is provided to cover the upper surface of the traveling body 4 and the front and rear wheels 2, 3; 4B, the engine 13 is arranged, and the flat shape portion 4
The power transmission mechanism 14 is arranged at A. (n) The hydrostatic transmission 26 is used for the power transmission mechanism 14, and the input shaft 27 and the output shaft 28 of this transmission 26 are arranged substantially in the front-rear direction and separated in the left-right direction. Deploy,
(P) The swivel bearing 36 and at least the swivel bearing 36 of the swivel base 6 are arranged between the front and rear wheels 2, 3 and at a position lower than the upper ends of at least one of the front and rear wheels 2, 3, (q) swivel base 6 has a rear part close to the engine 13 and a 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) The working device support part 37 is a swivel base. A swing shaft 39 is supported by 6 and a support body 38 provided upright on the swivel base 6, and a swing body 40 swung by a swing cylinder 41 is pivotally supported on the swing shaft 39, and the swing body 40 is laterally supported by the swing body 40. The boom 42 and a boom cylinder 43 that raises and lowers the boom 42 are pivotally supported via a shaft 48,
(T) The height of the work device support portion 37 is set to a height at which the boom 42 and the boom cylinder 43 can pass above the highest position of the traveling body 4, (u) the front upper portion of the swing body 40 is a swivel base. (W) A driver's seat arrangement frame body 51 is provided on the swivel base 6 so as to project radially outward from the driver seat 6.
The rear part of the vehicle is extended rearward from the swivel base 6, and the driver's seat 7 is arranged on the rearward projecting part so that the driver's seat 7 can pass above the traveling body 4 when the swivel base 6 turns (x) driver's seat The arrangement frame body 51 is composed of right and left columns 52 that are erected from the swivel base 6.
53 having a right and left struts 52 of the lops 53
And a supporting member 54 provided between the lower part of the vehicle and the swivel base 6, and the driver's seat 7 is mounted on the rope 53 and / or the supporting member 54. (y) The ground working device 9 is a tip of the boom 42. Has an arm 44 and a working tool 46 at the tip of the arm 44. The arm 44 has a bifurcated end in the left-right direction and can be replaced with a working tool 46 having a different width (z ) Arm 44 has left and right arms 44
L, 44R can be expanded / contracted, etc. are appropriately combined.

Further, the basic structure of the wheel type working machine 1 is compared with the weight of the traveling body 4 having the front and rear wheels 2 and 3.
Even when a configuration is adopted in which at least the total weight of the swivel base 6, the driver's seat 7, and the control device 8 among the swivel base 6, the driver's seat 7, the control device 8, and the ground work device 9 is set light,
Also, the distance L from the turning axis 5 of the upper structure 11 to the rear end
Even when a configuration in which 1 is substantially accommodated within the distance L2 from the turning shaft 5 to the rear end of the rear wheel 3 is added, the above combination can be similarly performed. The wheel type working machine 1 described above is suitable for efficiently performing grading work on a slope or a narrow site where the skid steer loader is not good, and it is also possible to scrape soil while moving, but hydraulic pressure is used when stopped. I am good at the method of scraping soil by using it, and by changing the work tool 46 with a different width, both transportation work and trench excavation work of 1.8 m or less such as electric wire burying can be performed by one unit.

That is, the work of using a machine in the ground leveling work can be roughly divided into transportation and grading. The wheel type working machine 1 has a slope or undulation on the ground, leveling, scraping soil, a groove or Grading work, which is soil movement work other than transportation, such as backfilling holes can be performed particularly efficiently. The present invention is not limited to the above-mentioned embodiment, but can be modified in various ways. For example, a 2-post type lops or a cabin device may be mounted instead of the 4-post type lops 53, the operation device 55 may be arranged near the handle 73, the stabilizer 10 may be attached to both the front and the rear of the traveling body 4, and The driving wheel may be a wheel type, and the driving wheel may be replaced with a crawler device.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
A 2-post type lops or a cabin device is mounted instead of the 4-post type lops 53, an operating device 55 is arranged in the vicinity of the handle 73, the stabilizer 10 is attached to both front and rear of the traveling body 4, and driven wheels are provided. It may be a wheel type and the driving wheels may be replaced with a crawler device.

[0045]

According to the present invention described in detail above, the traveling body 4
The swivel base 6 can be arranged at a low position with the engine 13 mounted on the vehicle, and traveling stability and work stability can be improved.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of a wheel type working machine of the present invention.

FIG. 2 is a side view of a main part.

FIG. 3 is a side view of a traveling body.

FIG. 4 is an overall plan view.

FIG. 5 is a plan view of a traveling body.

FIG. 6 is a plan view of the traveling drive device.

FIG. 7 is a cross-sectional rear view of the wheel device.

FIG. 8 is a plan view of a tip end portion of the ground work device.

FIG. 9 is a perspective view of the entire wheel type working machine as seen from the front.

FIG. 10 is a perspective view of the entire wheel type working machine as viewed from the rear.

FIG. 11 is a plan view showing a first modified example of the work implement mounting structure.

FIG. 12 is a plan view showing a second modification of the work implement mounting structure.

[Explanation of symbols]

1 wheel type working machine 2 front wheels 3 rear wheels 4 running bodies 4A flat shape part 4B Bulky shape part 5 swivel axis 5S Swivel axis center 6 swivel base 7 driver's seat 8 Control device 9 Ground work device 10 Stabilizer 11 Upper structure 12 Travel drive 13 engine 13A crankshaft 14 Power transmission mechanism 15 Swing motor 16 Fuel tank 17 Hydraulic oil tank 18 battery 21 body frame 22 Side frame 23 previous frame 24 cover 24A step section 26 Transmission 36 Slewing bearing 37 Working device support 51 Driver's seat arrangement frame 53 Lop 54 Supporting member 55 Operation device Center between P axes

Claims (7)

[Claims] 1. A traveling drive device having an engine is provided on a traveling body having front and rear wheels, a swivel base is provided on the traveling body via a swivel shaft and a swivel bearing, and a driver seat is provided on the swivel base.
It is provided with a control device arranged in front of the driver's seat and a ground work device arranged in the vicinity of the control device, an engine is arranged in the rear part of the traveling body, and the swivel base is arranged below the upper end of the engine. Wheel-type working machine characterized by being placed in. 2. The swivel bearing and at least the swivel bearing of the swivel base are arranged between the front and rear wheels and at a position lower than an upper end of at least one of the front and rear wheels. Wheel type working machine. 3. The wheel type working machine according to claim 1, wherein the turning shaft is located in front of the center between the front and rear wheels. 4. The wheel type working machine according to claim 1, wherein the driver's seat on the swivel base and the ground work device are arranged so that they can pass above the engine when turning. 5. The swivel base has a rear portion close to an engine,
The wheel type working machine according to any one of claims 1 to 4, wherein the front portion overlaps with the front wheels in the front-rear direction. 6. The wheel type working machine according to claim 1, wherein the swivel base is formed into a substantially circular shape in a plan view. 7. The traveling body is equipped with a fuel tank on one side on the left and right and a hydraulic oil tank on the other side on the left and right sides between the front and rear wheels. The wheel-type working machine according to any one of claims 1 to 6, wherein the wheel-type working machine is overlapped and protrudes laterally outward from the swivel base.