JP3473922B2 - Swivel low-height work vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel type low work vehicle with a high height of riding, and more particularly to a swivel type low work vehicle with a crawler or wheels operating at a work site with a limited vehicle height.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, a structure 1 having a vehicle height limit L (approximately 1.8 to 2.1 meters), a mine ceiling for ore collection, or a shelf for plantation work. The hydraulic excavator 100 that operates under a fence, or within the dimensions of a greenhouse, a greenhouse beam, a ceiling, or the like has a foothold 50 for the operator 3 mounted on the swivel frame 47 above the dimension C of the undercarriage device 23. There is. Operator 3
For protection of the cab 101
Is the sum of the sitting work size B of the operator 3 and the overhead protection clearance A. Therefore, operator 3
Since the seating work size B of No. 1 does not change, it is necessary to reduce the size C of the undercarriage device 23 in order to work within the vehicle height limit L. For this reason, the working machine 102 becomes small, and the capacity generally called a mini hydraulic excavator is 0.01 to 0.0.
A bucket 103 of 3 cubic meters class is used.

Further, in order to improve work efficiency, when the hydraulic excavator 110 with the working machine 112 having the large bucket 113 illustrated in FIG. 11 is put in, the operator protection cab 111 is a structure with a vehicle height limit L. 1. Or, in a mine ceiling for ore collection, a shelf, a fence under farm work, under a fence, a greenhouse, a beam of a greenhouse, or a ceiling, the dimension of La, which is the difference between the total height of the cab 111 and the vehicle height limit L, is have a finger in the pie. Therefore, when the cab 111 is removed and operated, the operator's head is struck on the structure 1, or a mine ceiling in ore collection, a shelf in farm work, under a fence, a vinyl house, a beam or ceiling of a greenhouse, etc. .
Therefore, the operator becomes dangerous in the boarding ceremony.
In order to ensure safety, when a large vehicle is used, another method such as radio control that does not require an operator to board is performed.

Further, Japanese Utility Model Laid-Open No. 63-156238 proposes a device for discharging earth and sand in a water channel, which is composed of a work machine in the water channel and a conveying device for discharging the earth and sand excavated by the work machine in the water channel to the outside of the water channel. There is. As shown in FIG. 12, the work implement 120 in a waterway has the upper revolving structure 20 installed on the lower traveling structure 23 via the revolving device 64, and the driver's seat 123 is located at the low position 122 on the side 121 of the upper revolving structure 20. A boom 124 is provided on the front part of the upper revolving structure 20 so as to be up and down, a bucket 125 is attached to the tip of the boom 124 so as to be vertically rotatable, and the driver's seat 123 has a substantially L-shape. It is characterized by that.

[0005]

However, the structure 1 or the tunnel ceiling for ore collection, the shelves for plantation work, under the fence,
In a work site with a vehicle height limit L for a greenhouse, a beam of a greenhouse, or a ceiling in a building, an underground passage, a waterway, or the like, and a soft earth removing site, the conventional FIG.
0 and the hydraulic excavator having the working machines 102, 112 of the hydraulic excavators 100, 110 shown in FIG. 11 and the in-water channel working machine 120 shown in FIG. 12 have the following problems. (I) When attempting to excavate earth and sand with the boarding mini excavator 100, the capacity of the bucket 103 is small, and in order to complete the scheduled work within the construction period, the operating number of the boarding mini hydraulic excavator 100 is increased only during the construction period. There is a need. On a soft ground, since the minimum ground clearance K of the mini hydraulic excavator 100 is low, the track-type undercarriage 23 slips due to the push-up of earth and sand due to the sinking of the vehicle body, thus lowering the work efficiency. (II) In order to complete the scheduled work within the construction period, when a large-capacity hydraulic excavator 110 with a working machine 112 having a large capacity bucket 113 is to be thrown in,
When the cab 111 interferes with the structure 1 of the vehicle height limiting part L, or a mine ceiling for ore collection, a shelf, a fence under farm work, a greenhouse, a greenhouse beam, or a ceiling, the dimension of La interferes. To do. In order to prevent interference, when the cab 111 is removed, the overhead structure 1 or a tunnel ceiling for ore collection, a shelf or a fence under farm work, a greenhouse, a beam of a greenhouse, or a ceiling is removed when the cab 111 is removed. There is a risk of hitting the head to the etc. and ensuring safety. In addition, when operating without the cab as described above, the operator is prohibited from boarding work for security reasons. (III) There is also a method such as radio control in which the cab 111 of the hydraulic excavator 110 is removed so that the operator does not have to board the vehicle. In this method, the bucket 11 such as corner picking work is used.
Soil excavation by finely operating 3 requires skill in operation.
Further, since the user does not board, the excavation position of the blade edge of the bucket is often invisible, which makes it difficult to operate by radio control. As a result, the operator's fatigue becomes large and continuous work cannot be performed, resulting in poor work efficiency. (IV) With the work implement 120 in a waterway, since the operator must bend the knees and bend forward to avoid hitting the head on the ceiling, the operator's fatigue increases, and continuous work cannot be performed. Make it less efficient.

The present invention is applicable to the structure 1, or a roadway ceiling for ore collection, a shelf for farm work, a fence, a greenhouse, a beam of a greenhouse, or a vehicle height limit L such as in a building, an underpass or a waterway. In order to complete the work within a construction period at a certain construction site, it is a first object to provide a swivel type low working height working vehicle having an operator boarding large working machine with a large bucket capacity. Further, it is an object of the present invention to provide a swivel low-board high-load work vehicle that reduces operator fatigue even when the operator is on board and performs earth and sand excavation operations such as corner picking work by finely operating the bucket. It has a secondary purpose.

[0007]

In order to achieve the above object, in the present invention, a swing circle 64 is provided on a lower traveling body 23 having a crawler belt 37 or wheels 71 operating at a work site having a vehicle height limit L. A swivel low vehicle height boarding work vehicle having a swivel body 20 supported and having a drive source 24 such as an engine, a cab 25 for protecting an operator, tanks, controls, a working machine 26, etc. The swivel frame 47 around the swivel center 48 on the 20 opens a floor portion 47b of the swivel frame 47 to form a drop hole for the leg portion 3a of the operator 3 and projects from the floor portion 47b below the drop hole to turn around the swivel center 48. Surrounded by a bottomed cylindrical body 47a that is concentric with the
a and 56b are provided.

A second aspect of the invention, which is mainly based on the first aspect, is a center frame 33 of the lower traveling body 23 having a cylindrical recess 33a having an upper opening centered on a swing center 48, and a swing frame 47 of the upper rotating body 20. And a cylindrical body 47a provided with foot storages 56a and 56b on the lower floor portion 50 fixed to the cylindrical floor 47a, and the cylindrical body 47a is rotatably fitted in the cylindrical recess 33a.

A third invention, which is mainly based on the first invention,
The center frame 33 and a foothold 56 on the lower floor 50.
a cylindrical body 47a provided with a and 56b, and a revolving frame 47
The revolving frame 47 is provided with an upper foothold foothold 56 on an opening front edge portion 47c forming a drop hole of the leg portion 3a of the operator 3.

A fourth invention, which is mainly based on the first invention,
The swing circle outer race 66 outside the bottom of the cylindrical body 47a of the lower floor 50 and the swing circle 64 with the swing circle inner race 65 attached inside the cylindrical recess 33a of the center frame 33, and the swing circle inner inside the cylindrical body 47a. Pinion 6 meshing with race 65
3 and a swing motor 61.

A fifth invention, which is mainly based on the first invention,
The swing circle outer race 66 is located on the outermost opening 49b side of the lower surface of the revolving frame 47, and the swing circle inner race 6 is located on the upper edge of the cylindrical recess 33a of the center frame 33.
Swing circle 64 to which 5 is attached, and revolving frame 4
A swing motor 43 having a pinion 63 that meshes with a swing circle inner race 65 is provided on the floor of No. 7.

A sixth invention, which is mainly based on the first invention,
A cab inner floor portion 49 is provided in a space where the floor portion of the revolving frame 47 is opened, a seat 51 is arranged on the cab inner floor portion 49, and traveling operation members 54a and 54b are provided on a lower floor portion 50 in front of the seat 51. Is installed.

A seventh invention, which is mainly based on the first invention,
Work equipment operating members 52a and 52b and a traveling operating member 54 are installed in front of the seat 51a on the lower floor 50.

An eighth invention, which is mainly based on the first invention,
It has a revolving frame 47 provided with an opening 47d centered on the revolving center 48, and a cylindrical body 88a having an upper edge portion 88b and foot floors 50a and 56b provided on a lower floor portion 50. The upper edge portion 88b is fitted in the cylindrical recess 33a so as to be freely rotatable, and the upper edge portion 88b is attached so as to close the opening on the lower surface of the rotating frame 47.

[0015]

The crawler belt 37 configured as described above, or
In the turning low vehicle height work vehicle 2 having the wheels 71,
The floor part 47b of the swivel frame 47 is opened and the operator 3
Since the foot holes 56a and 56b are provided in the lower floor 50 surrounded by the cylindrical body 47a by forming the pit of the leg portion 3a of the vehicle, the structure 1 having the vehicle height limit L, or the mine ceiling for ore collection, and plantation work Even for shelves, under fences, greenhouses, greenhouse beams, or ceilings in buildings, underpasses, waterways, etc., the ceiling height of the cab 25 should be lower than the vehicle height limit L dimension. obtain. Then, the operator's eyes 3b can be operated in the normal working posture while driving within the vehicle height limit L.
The excavation point 43e of the bucket 43 of the work machine 26 is visible.

Further, the cylindrical recess 33 of the center frame 33
Since the cylindrical body 47a fixed to the revolving frame 47 is rotatably fitted in the a and the lower floor 50 is lowered, the leg space of the operator 3 can be widened.

Since the upper footrest 56 is provided on the right side of the front floor 47c, the operator 3 sets the leg 3a as the upper foothold 56 and the foothold 56b of the lower floor 50 according to the working situation and preference. You can choose.

Also, the swing circle 64 of the turning device
Is installed outside the bottom of the cylindrical body 47a, so that the foot rests 56a and 56b of the lower floor 50 can be provided in the proper leg operation range position of the operator 3.

The swing circle 64 of the turning device
Is installed at the outermost opening 49b on the lower surface of the revolving frame 47, so that the footyards 56a, 56b of the lower floor section 50 can be located further downward by the thickness of the swing circle 64.

A traveling operation member 54 is attached to the lower floor 50.
Since the a and 54b are provided, the arm space of the operator 3 is widened, and the work operation is not unreasonable.

Further, since the traveling operation member 54 provided on the left side above the front floor 47c and the working machine operating members 52a and 52b provided on the lower floor 50 are provided, the vehicle options of the operator 3 are widened according to the work. .

Further, since the cylindrical body 88a is provided with the upper edge portion 88b and is attached to the lower surface of the revolving frame 47, the revolving frame 47 can be divided, and it can be applied to a large revolving type low vehicle height boarding work vehicle. .

[0023]

EXAMPLES Examples will be described with reference to the drawings.
FIG. 1 is an overall side view of a swing type low vehicle height work vehicle having a crawler belt according to the present invention. In FIG. 1, a structure 1 having a vehicle height limit L, or a tunnel ceiling for ore collection, a shelf for farm work, a fence, a greenhouse, a beam of a greenhouse, or a building,
A swivel low-profile high-priced work vehicle 2 having a crawler belt that operates at a vehicle height limit L due to a ceiling such as an underpass or a waterway, or at a work site that is a soft ground is a crawler-type undercarriage 2
3 and the upper revolving structure 20. The crawler type undercarriage 23 includes a track frame 30, an idler 31, a carrier roller 32, a center frame 33, a track roller 34, and a final drive 35, which drive left and right crawler belts 37 meshed with a sprocket 36. It is possible to run on rough terrain, which is often found at work sites. In addition, G. L represents the top surface of the excavated ground, and K represents the minimum ground clearance.

The upper swing body 20 is a drive source 2 such as an engine.
4, a cab 25 for protecting an operator, tanks, controls, a working machine 26, and the like, a swing frame 4
7, and is supported on the center frame 33, and a swing frame 47 is attached to a swing circle 64 shown in FIG. The work machine 26 includes a boom 40, an arm 41, a link 42, and a bucket 43.
However, the pins 46 are movably connected to each other, and the boom cylinder (not shown), the arm cylinder 44, and the bucket cylinder 45 are driven by a hydraulic source (not shown), so that the bucket 43 can excavate the earth and sand. In the figure, a bucket 43a indicates an excavation completion position, and 43b indicates a soil carrying position.
Reference numeral 3c indicates an excavation position, an excavation point 43e, which indicates that work can be performed freely even within the size of the vehicle height limit L. As a working machine, the conventional example can also be used.

FIG. 2 is a sectional view taken along the line AA of the swing type low vehicle height work vehicle 2 of the present invention shown in FIG. The revolving frame 47 is surrounded by a circular plate 47a fixed downward to a floor plate 47b which is circularly opened around a revolving center 48 of the revolving frame 47, and a lower step floor portion 50 which is lowered by one step is fixed to the outermost side 50a. Is formed. Further, the cylindrical body 47a is located inside the left and right crawler belts 37, and is configured not to interfere with the left and right crawler belts 37. Then, at the turning center 48 on the turning frame 47, the center frame 3
It is possible to turn 360 degrees on the 3rd.

The cab 25 is mounted on the floor portion 47b of the revolving frame 47 having the circular hole, and the cab inner floor portion 4 is attached.
9 is provided. In addition, the cab inner floor 49 has a gap that does not interfere with the swivel joint 60 that connects the fluid from the upper swing body 20 to the lower traveling body 29, or the head of the swing motor 61 that swings the upper swing body 20. And is attached to the floor 47b and the lower floor 50. If the swivel joint 60 and the swing motor 61 are flat and there is a gap with the cab inner floor portion 49, the height of the cab inner floor portion 49 is on the same plane or below the floor plate 47b. Good.

The seat 51 and the work machine operating members 53a, 53
The seat b is located on the inner floor 49 of the cab near the turning center 48, and the working machine levers 52a, 52 are arranged on the left and right sides of the seat 51.
Working machine operation members 53a and 53b including b and the like are arranged. The traveling operation members 54 a and 54 b are the traveling operation members 54 such as traveling levers for left and right traveling on the lower floor 50.
a and 54b are arranged, and the travel operation members 54a and 5b are arranged.
4b includes operator pedals 55a and 55b.
Are connected. Then, the foot pedals 55a, 55
Foot rest 5 of operator 3 when no traveling operation is performed outside b
6a and 56b are provided.

Further, FIG. 3 is a partial vertical cross-sectional view showing an embodiment of the turning type low vehicle height working vehicle 2 of the present invention. The swivel joint 60 is mounted on the turning center 48 of the center frame 33 having the cylindrical recess 33a, and supplies fluid to the traveling motor incorporated in the final drive 35 of FIG. The swing motor 61 is fitted to the revolving frame 47 and is fixed by bolts 62. The swing circle 64 includes a swing circle inner race 65, a swing circle outer race 66, and a ball bearing 67.
A pinion 63 is attached to the shaft end of the, and meshes with the swing circle inner race 65. The swing circle outer race 66 is fixed to the revolving frame 47, and the swing circle inner race 65 is fixed to the bottom of the cylindrical recess 33a of the center frame 33 with bolts 68, respectively. The seal 69 is fixed to the upper end of the cylindrical concave portion 33a and slides on the cylindrical concave portion 33a so that earth and sand are not caught in the rotating portion of the cylindrical concave portion 33a and the cylindrical body 47a.

As described above, the lower floor section 50 is lowered from the inner floor section 49 of the cab by one step, and footrests 56a and 56b are provided.
Since the above is provided, a margin can be provided in the operation range of the foot of the operator 3 and the leg 3a. Furthermore, the operator's eyes 3b are left working machine lever 52 while viewing the excavation point 43e of the bucket 43 of the working machine 26 shown in FIG.
At a, left turn, right turn, arm excavation, and arm dump work are performed, and the right work implement lever 52b can perform boom lowering, boom raise, bucket dump, and bucket excavation. Further, the combined work of moving the work vehicle by stepping on the traveling pedals 55a and 55b by the leg portion 3a of the operator 3 can be easily performed.

FIG. 4 is a partial vertical cross-sectional view of a swing type low vehicle height boarding work vehicle having a crawler belt according to another embodiment of the present invention.
The swing circle 64 is the swing circle 64 having an inner diameter on the outer side of the cylindrical body 47a, and the swing circle outer race 66 is attached to the outermost opening 49b of the lower surface of the revolving frame 47 to form the swing circle inner race 65.
Is attached to the upper edge of the cylindrical recess 33a of the center frame 33. The same functional parts as those in FIGS. 3 and 4 are designated by the same reference numerals. As described above, the lower floor portion 50 of the cylindrical body 47a
Is configured to be further lowered from the cab inner floor portion 49 by the thickness of the swing circle 64, so that the application of the swing type low vehicle height work vehicle with a cab is widened even in a site where the vehicle height is severely restricted. . Further, although the embodiment has been described as the vehicle equipped with the crawler type underbody device 23, the wheel type underbody device 70 of FIG.

FIG. 5 shows the crawler type undercarriage 2 of FIG.
3 is an embodiment in which 3 is replaced with a wheel type undercarriage 70,
1 is an overall side view of a turning type low work vehicle with wheels according to the present invention. In FIG. 5, on a structure 1 having a vehicle height limit L, or a mine ceiling for ore collection, a shelf for farm work, a fence, a greenhouse, a beam of a greenhouse, or a ceiling in a building, an underpass, or a waterway. The turning type low vehicle height work vehicle 2 having wheels 71 that are operated within the vehicle height limit L or at a work site that is a soft ground thereof is composed of a wheel type lower traveling body 70 and an upper traveling body 20. There is. Wheel type undercarriage 7
In No. 0, the front axle 75 and the rear axle 76 are suspended on the frame 73. Front axle 75
Wheels 71 are attached to the left and right of the rear axle 76. The wheel 71 is shown as a double wheel in FIG. 6, but may be a single wheel depending on the vehicle. Further, as a mudguard for the front and rear wheels 71, the frame 73 is provided with a front fan 74,
Rear ender 75 is attached. In addition, G. L
Indicates the top surface of the excavated ground.

The upper traveling body 20 is a drive source 2 such as an engine.
4, the cab 25 for protecting the operator, the tanks, the controls, the working machine 26, and the like, the swing frame 47
The swing frame 47 is rotatably attached to the swing circle 64 supported on the frame 73. The work machine 26 includes a boom 40 and an arm 4.
1, the link 42, and the bucket 43 are movably connected to each other by the pins 46, and the boom cylinder, the arm cylinder 44, and the bucket cylinder 45 (not shown) are driven by a hydraulic source (not shown) to excavate the earth and sand with the bucket 43. I am able to do it. In the figure, the bucket 43a indicates the excavation completion position, 43b indicates the soil carrying position, 43c indicates the soil discharging position, and the excavation point 43e, indicating that the work can be freely performed even within the dimension of the vehicle height limit L. There is. As a working machine, the conventional example can also be used. Further, the same functional parts as those in FIGS. 1 and 5 are designated by the same reference numerals.

Further, FIG. 6 is a partial vertical cross-sectional view showing an embodiment of a turning type low vehicle height working vehicle having wheels according to the present invention. Further, the same functional portions as those in FIG. 3 are designated by the same reference numerals. The swivel joint 60 is attached to the turning center 48 of the frame 73 having the cylindrical recess 33a, and supplies fluid to a traveling device (not shown) incorporated in the front axle 75 and the rear axle 76. . The revolving frame 47 has a circular opening in a floor portion 47b centered on a revolving center 48 of the revolving frame 47, and a lower-stage floor portion 50 surrounded by a cylindrical body 47a fixed downward is fixed. The lower floor 50 is located below the upper surface of the wheel 71. Furthermore, the lower floor 50 which is lowered one step
The cylindrical body 47a, which is the outermost side 50a of the lower floor, is located inside the left and right wheels 71 and is configured not to interfere with the left and right wheels 71. Then, at the turning center 48 on the turning frame 47, 360 degrees can be turned on the cylindrical recess 33a of the frame 73.

The swing motor 61 is fitted in the lower floor 50 and is fixed by bolts 62. The swing circle 64 includes a swing circle inner race 65,
It comprises a swing circle outer race 66 and a ball bearing 67. The pinion 63 is attached to the shaft end of the swing motor 61 and meshes with the swing circle inner race 65. The swing circle outer race 66 is fixed to the lower floor portion 50, and the swing circle inner race 65 is fixed to the bottom of the cylindrical recess 33a with bolts 68, respectively. The seal 69 is fixed to the cylindrical recess 33a and the upper edge of the cylindrical recess 33a so that the sand and sand are not caught in the rotating portion of the cylindrical body 47a.
The cylindrical body 47a fixed to the above slides. Cab 25
Is a floor portion 47b of the revolving frame 47 having the circular hole.
It is attached to the top. Further, the traveling operation member 54 is provided with a steering wheel in this embodiment.

As described above, since the lower floor 50 is lowered by one step from the wheels 71, the operator 3 is
In the normal working posture within 5, the operator can have a margin in the operating range of the legs and legs 3a, and the operator's eyes 3b are left while observing the excavation point 43e of the bucket 43 of the working machine 26 shown in FIG. The work implement lever 52a can perform left turn, right turn, arm excavation, and arm dump work, and the right work implement lever 52b can perform boom lowering, boom raise, bucket dump, and bucket excavation. Further, the operator can operate the accelerator and the brake pedal 55 for traveling by the leg portion 3a to allow traveling and braking of the work vehicle, which facilitates complex work.

7 and 8 show another embodiment of the upper swing body 20 shown in FIGS. 2 and 3, and the same functional parts as those in FIGS. 2 and 3 are designated by the same reference numerals and their description is omitted. To do. 7 and 8, the floor portion 47 of the revolving frame 47 having a circular opening 47d centered on the revolving center 48.
b has a cylindrical body 87a fixed downward and provided with a lower edge portion 87b. A travel operation member 54 such as a travel operation lever is attached to the left side of the front floor 47c of the opening 47d of the floor 47b, and an upper footrest 56 is attached to the right side of the front floor 47c. The traveling operation member 54 is provided with two stick levers in this embodiment. Further, it has a cylindrical body 88a provided with an upper edge portion 88b so as to close the opening 47d of the floor portion 47b and to which the lower floor portion 50 is fixed. The cylindrical body 88 a is a cylindrical recess 3 provided in the center frame 33.
The upper edge portion 88b is fitted in the 3a so as to be freely rotatable, and
It is attached to the lower edge portion 87b. Bucket type seat 51a
On the lower floor 50 in the front near the turning center 48, footrests 56a and 56b and working machine operating members 52a and 52b having working machine levers and the like are attached. Further, the lower floor 50 which is lowered by one step and the cylindrical body 88a which is the outermost floor 50a of the lower floor are located inside the crawler belts 37 on the left and right, and are configured not to interfere with the crawler belts 37 on the left and right. Then, at the turning center 48 on the turning frame 47, the cylindrical recess 33a is formed.
The upper part can turn 360 degrees.

The cab 25 is mounted on the floor portion 47b of the revolving frame 47 having the circular hole, and the cab inner floor portion 4 is attached.
9 is provided. The cab inner floor portion 49 is the upper swing body 20.
The floor board 47b with a gap that does not interfere with the swivel joint 60 that connects the fluid to the lower traveling body 23 or the head of the swing motor 61 that rotates the upper rotating body 20.
It is attached to the top. The swivel joint 60,
The swing motor 61 is flat and the cab inner floor 49
The height of the cab inner floor portion 49 may be on the same plane as the floor plate 47b of the revolving frame 47 or below the floor plate 47b of the revolving frame 47 if there is a gap between Further, the seat 51 a in the cab 25 is of a bucket type and is attached above the swing motor 61 of the cab inner floor 49.

FIG. 9 shows another embodiment of the cylindrical body 88a attached to the revolving frame 47 of FIG. The same constituent members as those in FIG. 7 are designated by the same reference numerals, and the same reference numerals will not be described. The cylindrical body 88a is formed by lengthening the cylindrical body 88a portion in FIG. 7 and directly attaching the upper edge portion 88b to the lower surface of the floor portion 47b of the revolving frame 47 having a circular opening 47d. Further, in addition to directly attaching the cylindrical body 88a to the floor portion 47b of the revolving frame 47, the upper edge portion 88b is attached to the floor portion 47b.
It may be fixed directly to the lower surface.

As described above, since the lower floor 50 is lowered by one step from the shoe 37, the leg 3a of the operator 3 has a margin of movement and the operator's eyes 3b are shown in FIG.
The operator 3 can visually check the excavation point 43e of the bucket 43 of the working machine 26 shown in FIG. 2, so that the operator 3 in the normal working posture in the cab 25 uses the left working machine lever 52a to rotate left and right,
Arm excavation and arm dump work are performed, and the right work implement lever 52b can perform boom lowering, boom up, bucket dump, and bucket excavation. Further, since the upper foothold 56 is provided on the right side of the front floor 47c, the operator 3 can select the leg 3a as the upper foothold 56 and the foothold 56b of the lower floor 50 according to the work situation. Driving fatigue can be reduced. Further, the traveling operation member 54 is provided on the left side above the front floor portion 47c, and the working machine operation member 52 is provided on the lower floor portion 50.
Since a and 52b are provided, the vehicle options of the operator 3 are widened according to the work. Further, the cylindrical body 88a
Since the upper edge portion 88b is provided on the lower surface of the revolving frame 47, the cylindrical body 88a and the revolving frame 47 can be divided into separate parts, which can be machined separately. Applicable to work vehicles.

[0040]

Since the present invention is configured as described above, the crawler belt 3 having a wide versatility as a work vehicle in a space having the vehicle height limit L having the effects as described below can be obtained.
The present invention provides a swing type low-height work vehicle having seven or wheels 71.

The floor 47b of the swivel frame 47 is opened to form a pit for the leg 3a of the operator 3, and the cylindrical body 4
Since the footholds 56a and 56b are provided on the lower floor 50 surrounded by 7a, the operator 3 can get on board and perform detailed work, and the work efficiency is improved. Therefore, the number of operating vehicles can be reduced and the risk of work vehicle crossing is reduced. In addition, scheduled work can be completed safely within the construction period without softening the ground due to running even on soft ground. Moreover, since the capacity of the bucket 43 is large and the vehicle height is low, the structure 1 of the vehicle height limiting section L or a mine ceiling for ore collection, shelves for plantation work, under a fence, a greenhouse, a greenhouse beam, Or in the building,
Even when working in an underpass or a waterway, it is possible to improve work capacity with the cab 25, which is preferable for security measures. Then, since the operator 3 is on board, the excavation position 4 is used for the earth and sand excavation operation by finely operating the bucket, such as corner picking work.
Operator 3 because 3e can be seen and driving is easy
Fatigue is small and continuous work is possible, improving work efficiency.

Further, the cylindrical concave portion 33 of the center frame 33
Since the cylindrical body 47a fixed to the swivel frame 47 can be swivelly fitted into the a to lower the lower floor 50, the space inside the cab can be made high, the leg space of the operator 3 can be widened, and the work operation is impossible. In addition, the operating fatigue of the operator 3 can be reduced.

Further, since the upper footrest 56 is provided on the right side of the front floor 47c, the operator 3 sets the leg 3a as the upper foothold 56 and the foothold 56b of the lower floor 50 according to the working situation and preference. It is possible to make a selection, the leg space of the operator 3 is widened, and the leg motion is not forced, so the driving fatigue of the operator 3 can be reduced.

In addition, the swing circle 64 of the turning device
Is installed outside the bottom of the cylindrical body 47a,
The lower floor 50 is placed at a position within the proper leg operation range of the operator 3.
Footholds 56a, 56b are provided. Therefore, it is possible to provide a swivel low vehicle height work vehicle that has the crawler belt 37 or the wheels 71 having a lower vehicle height and less fatigue of the operator 3.

Further, the swing circle 64 of the turning device
Is installed at the outermost opening 49b on the lower surface of the revolving frame 47, so that the footyards 56a and 56b of the lower floor section 50 can be located further downward by the thickness of the swing circle 64, so that the smallest work machine equipped with a larger work machine can be installed. A large swing type low vehicle height boarding work vehicle having a high ground clearance K can be put to practical use.

Further, the traveling operation member 54 is attached to the lower floor 50.
Since a and 54b are provided, the operation space of the arm portion of the operator 3 is widened, and the work operation is not overly forceful, and driving fatigue can be reduced.

Further, since the traveling operating member 54 provided on the left side above the front floor 47c and the working machine operating members 52a and 52b provided on the lower floor 50 are provided, the vehicle choices depending on the work and the work site are widened. .

The swivel frame 47 and the cylindrical body 88a
Since the upper edge portion 88b is provided on the cylindrical body 88a and is attached to the lower surface of the revolving frame 47, the revolving frame 47 and the cylindrical body 88a can be divided and separately processed, and the productivity is improved. It can also be applied to large-sized turning type low vehicle height boarding work vehicles.

[Brief description of drawings]

FIG. 1 is an overall side view of a turning type low vehicle height boarding work vehicle having a crawler belt according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the swing type low vehicle height boarding work vehicle having the crawler belt of the present invention.

FIG. 3 is a partial vertical cross-sectional view showing an embodiment of a swivel type low vehicle height work vehicle having a crawler belt according to the present invention.

FIG. 4 is a partial vertical cross-sectional view showing an embodiment of a swivel low-profile high-load working vehicle having a crawler belt according to another embodiment of the present invention.

FIG. 5 is an overall side view of a swivel low-height work vehicle having wheels according to another embodiment of the present invention.

FIG. 6 is a partial vertical cross-sectional view showing an embodiment of a turning low vehicle height work vehicle having wheels according to the present invention.

FIG. 7 is a partial vertical cross-sectional view showing another embodiment of the swivel type low vehicle height work vehicle having the crawler belt of the present invention.

FIG. 8 is a sectional view taken along line BB of FIG.

9 is another embodiment of the cylindrical body attached to the swivel frame 47 of FIG. 7. FIG.

FIG. 10 is an overall side view of a conventional mini hydraulic excavator.

FIG. 11 is an overall side view of a conventional hydraulic excavator.

FIG. 12 is an overall side view of a conventional in-water channel working machine.

[Explanation of symbols]

L vehicle height limit, 1 structure,
2 Revolving low-vehicle high-load work vehicle having tracks or wheels, 3 operators, 3a legs, 20 upper revolving structure, 23 lower traveling structure,
24 drive sources, 25 cabs,
26 working machines, 33 center frames,
33a cylindrical recess, 37 crawler track,
43 swing motor, 47 swing frame, 47a, 88a cylindrical body, 47b
Floor, 47c opening front edge, 47
d opening, 48 turning center, 4
9 cab inner floor, 49a floor outermost, 49b opening outermost, 50 lower floor, 51, 51a seats, 52a, 52b work machine operating member, 54, 54a, 54b traveling operating member, 56
Upper stage foothold Foothold, 56a, 56b Foothold, 61 swing motor, 63 pinion, 64 swing circle, 65 swing circle inner race, 66 swing circle outer race, 71 wheels, 88b
Upper edge.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Jikhohei 7-2738 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02F 9/10 E02F 9/16 E02F 9 / 08

Claims (8)

(57) [Claims] 1. A swing circle (64) is supported on a lower traveling body (23) having a crawler belt (37) or wheels (71) operating at a work site having a vehicle height limit (L), and is supported by an engine or the like. Drive source
(24), a cab (25) for operator protection, a tank, controls, a working machine (26), etc. Swivel frame (47) around swivel center (48) on upper revolving structure (20)
Open the floor (47b) of the swivel frame (47) to form a drop hole for the leg (3a) of the operator (3), and project below the drop hole from the floor (47b) to turn the swivel center (48b). ), A footrest (56a, 56b) is provided on the lower floor (50) surrounded by a bottomed cylindrical body (47a), and is a swing-type low-height work vehicle. 2. A center frame of a lower traveling body (23) having a cylindrical recess (33a) having an upper opening centering on a turning center (48).
(33) and a cylindrical body (47a) provided with foot storages (56a, 56b) on the lower floor (50) fixed to the revolving frame (47) of the upper revolving structure (20).
The swivel low-ride high-load work vehicle according to claim 1, further comprising: a cylindrical body (47a) fitted in the cylindrical recess (33a) so as to be rotatable. 3. The center frame (33) and the lower floor (5)
It consists of a cylindrical body (47a) with footholds (56a, 56b) in (0) and a swivel frame (47) .The swivel frame (47) inserts a drop hole in the leg (3a) of the operator (3). Forming opening Front edge (47
The swivel low-boarding work vehicle according to claim 1, characterized in that an upper foothold foothold (56) is provided in c). 4. A swing frame outer race (66) and a center frame outside the bottom of the cylindrical body (47a) of the lower floor (50).
The swing circle (64) with the swing circle inner race (65) attached inside the cylindrical recess (33a) of (33) and the cylindrical body
(47a) The swing type low-height work vehicle according to claim 1, wherein a swing motor (61) having a pinion (63) meshing with the swing circle inner race (65) is provided inside. 5. The outermost opening (4) of the lower surface of the revolving frame (47).
The swing circle outer race (66) on the 9b) side and the swing circle (64) with the swing circle inner race (65) attached to the upper edge of the cylindrical recess (33a) of the center frame (33),
Swing motor with pinion (63) meshing with swing circle inner race (65) on the floor of revolving frame (47)
(43) is provided, The turning type low boarding height work vehicle according to claim 1. 6. A cab inner floor portion (49) is provided in a space where the floor portion of the swivel frame (47) is opened, and a seat (51) is arranged on the cab inner floor portion (49) and the seat (51 (2) A traveling operation member (54a, 54b) is installed on the lower floor section (50) in front of (1). 7. A working machine operating member (52a, 52a) on the lower floor (50).
The swivel low-height work vehicle according to claim 1, wherein b) and a traveling operation member (54) are installed in front of the seat (51a). 8. An opening (47d) centered on a turning center (48).
And a cylindrical body (88a) having an upper edge portion (88b) and a foothold (56a, 56b) provided on the lower floor portion (50). ) Is rotatably fitted in the cylindrical recess (33a), and the upper edge (88b) is attached to the revolving frame (47).
The swivel low-board high-load work vehicle according to claim 1, wherein the swivel low-height work vehicle is attached so as to close the opening on the lower surface.