JP2812439B2 - Turning work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a structure in which a rear portion of an upper body structure including a seat, an engine, a hydraulic pump, an oil tank, and the like disposed on a swivel frame may collide with an obstacle during turning. Without excavating without having to worry about the rear, it is possible to easily return the swiveled upper body structure in the running direction, and at the front part on the opposite side of the seat, a boarding / alighting part connected to the seat is provided, The present invention relates to a turning vehicle such as a backhoe capable of confirming the state of excavation work from the getting on / off section.

[0002]

2. Description of the Related Art In a conventional turning work vehicle such as a backhoe, the technology of a standard type and an improved ultra-small turning type turning work vehicle is known. FIG. 4 is a plan view of a conventional standard type backhoe, FIG. 5 is a side view of an ultra-small swivel type backhoe in which a work machine A called a coffee cup type is folded over an upper body structure B and can be swiveled, and FIG. FIG. 7 is a plan view of the ultra-small turning type backhoe of FIG. 5, FIG. 7 is an exploded perspective view of an offset boom mechanism for enabling ultra-small turning, FIG.
FIG. 9 is an overall perspective view of a micro-swirl backhoe in which the engine 11 is arranged on the left and right sides of the left and right center lines M, FIG. 9 is a side view of the micro-swirl backhoe of FIG. 8, and FIG. FIG. 9 is a plan view of the ultra-small swivel type backhoe of FIG.

[0003] In the standard type backhoe shown in FIG.
At the rear of the upper body structure B mounted on the swivel frame,
Since the turning diameter centered on the turning center projects considerably rearward from the crawler type traveling device 22, when turning, the upper body structure B projects to the left and right positions like B 'and B ". There was a danger of colliding with the side walls and other obstacles on the road, so a micro-swirl backhoe was developed to solve the problems of the standard backhoe. There was a problem.

In the prior art of the ultra-small swivel type backhoe shown in FIGS. 5, 6 and 7, in order to make it possible to store a working machine within a swivel radius of the swivel frame 2 in a coffee cup shape, The work equipment fulcrum of the work equipment is located near the center of rotation, and the work equipment fulcrum is also high, so the center of gravity of the aircraft is high, the balance when traveling is poor, and walk-through is possible It was not possible to have a boarding position structure.

[0005] Further, in the ultra-small turning type backhoe,
In order to enable the digging of the side ditch, it is necessary to interpose an offset boom mechanism between the main boom 3 and the bucket arm 21 so that the tip of the main boom 3 can be offset right and left. However, there is a problem that the operating speed of the working machine needs to be reduced because the balance is poor. Further, when the offset boom is provided, there is a possibility that the bucket 4 may interfere with the canopy and enter the living space, and there is a problem that a mechanism for eliminating this danger becomes complicated.

Further, as shown in FIGS. 7, 8, and 9, the arm cylinder 19 requires a cylinder holder 19a.
Further, in order to offset the boom, the offset cylinder 50 needs to be on the right side and the parallel link 51 on the left side, and the offset boom 52 has to be configured. In this configuration, the offset boom 52 and the parallel link 51 are in a parallel state and are offset right and left.

As shown in FIG. 10, the seat 9 is conventionally arranged on the left side of the left and right center lines M, and the engine 11 is arranged so as to straddle over the center line M. Therefore, seat 9
, The position of the seat 9 is raised, and the work implement pivot 29 is also located immediately before the engine 11, so that the engine 11 and the hood 10
In order to avoid interference with the work machine A, the work machine A is located at a high position, and the entire work machine A has a structure with a high center of gravity.

Further, a standard type backhoe is known, for example, as disclosed in Japanese Utility Model Laid-Open No. 57-202461.
The ultra-small swivel type backhoe is, for example, an actual open flat 1-1643.
It is publicly known as disclosed in Japanese Patent Publication No. 37.

[0009]

SUMMARY OF THE INVENTION Conventionally, Japanese Utility Model Application
As shown in JP-A-202461, there is a so-called standard type backhoe, but it has the following problems.
Since the rear portion of the revolving frame above the traveling device protruded beyond the width of the traveling device during turning, the rear portion was likely to collide with an obstacle. In particular, when digging at the side of a wall, the aircraft is moved to the side of the wall to dig a gutter, so when turning to load earth and sand on a truck stopped on the opposite side of the wall, the rear part of the turning frame is And the revolving frame on the upper part of the traveling device could not be turned. Therefore, excavation work in a narrow place was impossible.

Therefore, in order to solve the problems of the standard type backhoe, an ultra-small turning type backhoe as disclosed in Japanese Utility Model Laid-Open No. 1-164337 has been developed. In the case of this ultra-small turning type backhoe, the turning frame at the top of the traveling device does not protrude from the width of the traveling device during turning, and therefore fits within the width. Therefore, work in a narrow place becomes possible. However, when digging a gutter, the ultra-small swivel type backhoe can only operate the working machine in the vertical direction. Therefore, in order to operate the working machine in the left-right direction, the upper part of the boom includes an offset boom, an arm cylinder, and the like. ,
An offset boom mechanism is required. By providing this offset boom mechanism at the upper part of the boom, when excavating with a bucket at the tip of the arm by tilting the offset boom of the offset boom mechanism to the side groove sideways in the left-right direction when digging the side groove, There is a problem that the offset boom mechanism comes into contact with the portion and it is not possible to dig deeper than that. Also, when digging a gutter by the wall, after digging the soil in the gutter and raising the working machine,
It turns to transport this earth and sand to the bed of the truck, but in this case, the boom of the work machine is offset for digging the gutter, and when the work machine is raised and raised in this position, The rear part of the arm cylinder projects from the revolving frame from the offset boom mechanism in the eccentric position. When the turning frame is turned from this state, the rear portion of the arm cylinder projects from the rear portion of the turning frame, so that the rear portion of the arm cylinder protrudes from the width of the traveling device. Therefore, there is a problem that the arm cylinder comes into contact with the side wall and cannot turn. Further, since the offset boom mechanism exists above the boom constituting the working machine, the weight of the working machine increases. Therefore, when the work machine is extended forward, the work machine is heavy and the balance of the work vehicle is deteriorated. Further, when the working machine is raised and raised, the working machine is heavy, so that the position of the center of gravity of the working vehicle is increased and stability is deteriorated. For this reason, there was also a problem that work or running at a high speed was not possible.

In the ultra-small swivel type backhoe described in Japanese Utility Model Laid-Open Publication No. 1-164337, the side end and the front end of the swivel frame on the cab side are formed linearly.
When the side end and the front end are extended so as to intersect, the extended intersection protrudes from the turning circle. Therefore, since the driver's cab is removed from the turning circle to the outside at the extended intersection, the space at the foot of the seat in the driver's cab is narrowed accordingly. An operator's cab is disposed on the left side of the upper surface of the revolving frame, a fuel tank and a hydraulic oil tank are disposed on the right side, and a base of the working machine is disposed substantially in the center. Therefore, since the working machine is located between the seat and the fuel tank or the like, no boarding / alighting portion connected to the seat is provided, and it is impossible to get on / off from the front portion on the opposite side of the seat. Further, it was not possible to move from the seat to the getting on / off section and check the state of excavation work and the like.

[0012]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. According to the first aspect, an upper body structure is provided in which a swivel frame is rotatably mounted to a traveling device via a swivel bearing, and a seat, an engine, a hydraulic pump, an oil tank, and the like are arranged on the swivel frame. A work implement is pivotally supported at the front end of the swivel frame via a work implement pivoting portion so as to be operable in the up-down direction and the left-right direction, and at least a rear largest dimension portion of the upper body structure is a traveling device. In the turning work vehicle having the width, at least the seat-side end of the swivel frame is formed substantially linear, the seat-side front end of the swivel frame is formed substantially linear, and An extended intersection between the seat-side end and the seat-side front end is configured to be substantially within the turning circle of the rear largest dimension portion of the upper body structure. According to a second aspect of the present invention, a swivel frame is pivotally mounted on the traveling device via a swivel bearing, and a seat, an engine, a hydraulic pump, an oil tank, and the like are arranged on the swivel frame to form an upper body structure. A work implement is pivotally supported at the front end of the swivel frame via a work implement pivoting portion so as to be operable in the up-down direction and the left-right direction, and at least a rear largest dimension portion of the upper body structure is a traveling device. In the turning work vehicle within the width, the front end of the turntable frame opposite to the seat protrudes forward from the front end of the seat side, and on the front side opposite to the seat,
It is provided with a boarding and alighting section connected to the seat.

[0013]

Next, an embodiment of the present invention will be described. FIG. 1 is an overall side view of the backhoe of the present invention,
2 is an overall plan view of the backhoe shown in FIG. 1, and FIG. 3 is a plan view showing an arrangement of each device on the upper portion of the swivel frame 2.

1 and 2, the overall construction of the turning work vehicle according to the present invention will be described. Although the embodiment shows the backhoe, other turning vehicles may be used. The backhoe includes a traveling vehicle body that travels by a crawler-type traveling device 22. Between the crawler-type traveling devices 22, an earth discharging plate 24 is supported by an earth discharging plate cylinder 28 so as to be rotatable up and down. . A turning table bearing 30 is disposed at the center of the crawler type traveling device 22, and a turning motor 6 is disposed at the center of the turning table bearing 30, and the center position of the turning motor 6 is set to the turning center O. Have been.

The swivel frame 2 is provided above the swivel bearing 30.
Is fixed. As shown in FIG. 3, the revolving base frame 2 is formed in a semicircular shape, and has a working machine fulcrum C at the front.
Are arranged, and the lower end of the work machine A is pivotally supported by the work machine pivot shaft 29. The work machine A has a main part constituted by a main boom 3, a bucket arm 21 and a bucket 4. The main boom 3 can be vertically rotated by a boom cylinder 18, and the bucket arm 21 is vertically moved by an arm cylinder 19. It is rotatable. The bucket 4 is pivotally supported by the tip of a bucket arm 21, and is pivoted by a bucket cylinder 20. The main boom 3 can be swung right and left by a swing cylinder 16 in order to make it possible to dig a side ditch. The swing cylinder 16 is disposed at a position opposite to the seat 9 and below the hydraulic oil tank 14 and the fuel tank 31, as shown in FIG.

A seat 9 and a canopy roof 23 are disposed on the swivel frame 2 on the left side, and a hydraulic oil tank 14 and a fuel tank 31 are disposed on the right side.
0. The hood 10 is formed in a half-moon shape, and the string portion is slanted, and is slanted in a plan view from the right end of the crawler traveling device 22 to the rear of the seat 9. . Further, the canopy support columns 26 and 27 of the canopy roof 23 are formed in a front and rear open leg shape, so that the canopy support columns 26 and 27 do not interfere with the movement of the operator from the left entrance / exit to the right walk-through entrance / exit D. The support columns 26 and 27 are arranged and configured.

An operation column 25 is disposed at the front of the seat 9 to operate the work machine A and to operate the crawler traveling device 2.
2 are provided. As shown in FIG. 2, a left entrance / exit E is disposed between the seat 9 and the operation column 25, and the left entrance / exit E communicates with a right walk-through entrance / exit D. It is configured to be able to get on and off even from the air. The control valve 5 is disposed below the left entrance E.
Further, as shown in FIG. 2, since the work machine A is arranged before the upper body right front end B1 of the upper body structure B, even if the main boom 3 itself is swung, there is no possibility of interference with the hood 10. The swing cylinder 16 can form a boom swing mechanism. A fuel tank 31 is disposed at a position where the main boom 3 is swung to the maximum, and a surplus space up to that point is configured as a walk-through doorway D. Therefore, the walk-through entrance D
Is closed by the rotated main boom 3 when digging a side ditch. That is, the walk-through entrance D and the swing space of the main boom 3 are also used.

Next, a description will be given with reference to FIG. The upper body structure B is formed in an arc shape, and the rear portion of the upper body structure B is located inside a circle that falls within the width of the crawler-type traveling device 22 when the upper body structure B turns around the turning center O. It is configured as follows. Further, the engine 11 and the seat 9 are arranged at different positions on the left and right with the left and right center lines M interposed therebetween, so that the two do not overlap. The engine 11 is disposed obliquely as shown in a plan view, and a radiator 12 and an oil cooler 13 are disposed at the right end. On the left side of the engine 11, the hydraulic pump 7
The battery 8 is disposed at a position above or below the hydraulic pump 7. Also, Engine 1
The radiator 1, the radiator 12, and the hydraulic pump 7 are arranged behind the center of rotation and along the arcuate portion at the rear of the upper body structure B. A hydraulic oil tank 14 is disposed at a position in front of the engine 11, and a fuel tank 31 is disposed in front of the hydraulic oil tank 14.

The fuel tank 31 is disposed obliquely and has a long shape along the walk-through entrance D. The position of the fuel tank 31 is configured at the right end position of the left and right swing of the main boom 3. A work implement fulcrum C is formed at a position forward of the upper body right front end B1 of the upper body structure B. The work implement fulcrum C is formed by the work implement pivot 1 and the work implement pivot 29. It is configured. When the main boom 3 swings to the left, it swings to the position of the front handrail 17 in front of the operation column 25, and the front handrail 17 is disposed at a position retracted from the right front end B1 of the upper body. Therefore, the main boom 3 and the front handrail 17 do not interfere with each other.

Further, as shown in FIG.
The left end of the seat 9 on the left side entrance E side is formed in a substantially straight line, and the front end of the seat 9 on the side of the operation column 25 is formed in a substantially straight line. The extended intersection between the side end of the upper side and the front end of the swivel frame 2 on the side of the seat 9 is configured to be substantially within the turning circle of the upper body structure B. The upper body right front end B1, which is the front end opposite to the seat 9 of the revolving base frame 2, is formed so as to project forward from the front end of the revolving base frame 2 on the seat 9 side. A walk-through entrance D connected to the seat 9 is provided at a front portion on the opposite side of the seat 9.

The bonnet 10 is formed in a half-moon shape, and the string portion is formed diagonally. A fuel tank 31 is arranged along the oblique chord. A swivel table bearing 30 is arranged on the side of the seat 9, and the swivel motor 6 and the swivel center O are formed inside the swivel table bearing 30. As shown in FIG. 2, the rear portion is completely arc-shaped with respect to the front-rear center line N passing through the turning center O of the aircraft, and the arc forms a turning arc centered on the turning center O. . The arc is configured to enter between the left and right crawler traveling devices 22.

With the above configuration, the rear portion of the upper body structure B follows the shape of a turning arc centered on the turning center O, and the arc is formed between the left and right crawler-type traveling devices 22. Since the vehicle is in the space where the turning work vehicle has passed, there is no possibility that the rear upper body structure B will interfere with an obstacle even if the vehicle turns. The work implement A arranged at the front end of the swivel frame 2 cannot be completely folded on the upper part of the swivel frame 2, but the bucket 4 and the main boom 3 located at the front of the operator are constantly monitored. In this state, there is little possibility that the vehicle will turn too much and come into contact with an obstacle. Therefore, although it is not actually a coffee cup type ultra-small turning type backhoe, it can be operated with the same feeling as the ultra-small turning type at the stage of actual work operation.

[0023]

As described above, the present invention has the following advantages. Conventionally, actual opening 57
As shown in JP-A-202461, there is a so-called standard type backhoe, but it has the following problems.
Since the rear portion of the revolving frame above the traveling device protruded beyond the width of the traveling device during turning, the rear portion was likely to collide with an obstacle. In particular, when digging at the side of a wall, the aircraft is moved to the side of the wall to dig a gutter, so when turning to load earth and sand on a truck stopped on the opposite side of the wall, the rear part of the turning frame is And the revolving frame on the upper part of the traveling device could not be turned. Therefore, excavation work in a narrow place was impossible.

In order to solve the problems of the standard type backhoe, an ultra-small turning type backhoe as disclosed in Japanese Utility Model Laid-Open No. 1-164337 has been developed. In the case of this ultra-small turning type backhoe, the turning frame at the top of the traveling device does not protrude from the width of the traveling device during turning, and therefore fits within the width. Therefore, work in a narrow place becomes possible. However, when digging a gutter, the ultra-small swivel type backhoe can only operate the working machine in the vertical direction. Therefore, in order to operate the working machine in the left-right direction, the upper part of the boom includes an offset boom, an arm cylinder, and the like. ,
An offset boom mechanism is required. By providing this offset boom mechanism at the upper part of the boom, when excavating with a bucket at the tip of the arm by tilting the offset boom of the offset boom mechanism to the side groove sideways in the left-right direction when digging the side groove, There is a problem that the offset boom mechanism comes into contact with the portion and it is not possible to dig deeper than that.

Further, when digging a gutter near a wall, the earth and dirt in the gutter is dug, and after the work machine is raised and erected, it is turned to transport the earth and sand to a truck bed. In this case, This is a state in which the boom of the work machine is offset for digging the side ditch. When the work machine is raised and set up in this posture, the rear part of the arm cylinder projects from the revolving frame from the offset boom mechanism in the unevenly positioned position. When the turning frame is turned from this state, the rear portion of the arm cylinder projects from the rear portion of the turning frame, so that the rear portion of the arm cylinder protrudes from the width of the traveling device. Therefore, there is a problem that the arm cylinder comes into contact with the side wall and cannot turn. Further, since the offset boom mechanism exists above the boom constituting the working machine, the weight of the working machine increases. Therefore, when the work machine is extended forward, the work machine is heavy and the balance of the work vehicle is deteriorated. Also, when you raise the work machine and stand it,
Since the work machine is heavy, the position of the center of gravity of the work vehicle is increased, and stability is deteriorated. For this reason, there was also a problem that work or running at a high speed was not possible.

In the ultra-small turning backhoe described in Japanese Utility Model Laid-Open No. 1-164337, the side end and the front end of the turning frame on the driver's cab side are formed linearly.
When the side end and the front end are extended so as to intersect, the extended intersection protrudes from the turning circle. Therefore, since the driver's cab is removed from the turning circle to the outside at the extended intersection, the space at the foot of the seat in the driver's cab is narrowed accordingly. An operator's cab is disposed on the left side of the upper surface of the revolving frame, a fuel tank and a hydraulic oil tank are disposed on the right side, and a base of the working machine is disposed substantially in the center. Therefore, since the working machine is located between the seat and the fuel tank or the like, no boarding / alighting portion connected to the seat is provided, and it is impossible to get on / off from the front portion on the opposite side of the seat. Further, it was not possible to move from the seat to the getting on / off section and check the state of excavation work and the like.

The present invention has solved the above-mentioned problem of the ultra-small swivel type backhoe. That is, claim 1 of the invention of the present application is that a swivel frame is pivotally mounted on a traveling device via a swivel bearing, and a seat,
An upper body structure is configured by disposing an engine, a hydraulic pump, an oil tank, and the like, and a work machine is pivotally mounted on a front end of the swivel frame via a work machine support portion so that the work machine can be operated in the vertical and horizontal directions. In the turning work vehicle, wherein at least the rear largest dimension portion of the upper body structure is within the width of the traveling device, at least the seat-side end of the swivel frame is formed substantially linearly, and the seat side of the swivel frame is seated. The front end is formed in a substantially straight line, and the extended intersection between the seat-side end and the seat-side front end of the swivel frame is substantially within the turning circle of the rearmost dimension of the upper body structure. Therefore, the following effects are obtained.

First, a work machine is pivotally supported at the front end of the swivel frame so as to be operable up and down and left and right.
Since the rear largest dimension of the upper body structure is at least within the width of the traveling device, the rear largest dimension of the upper body structure fits within the width of the traveling device, and at the time of turning, the rear portion of the upper body structure is an obstacle. No more contact. Secondly, particularly when digging a gutter, the work implement is pivotally supported at the front end of the swivel frame so as to be operable in the vertical and horizontal directions, so that at least the rearmost dimension of the upper body structure is within the width of the traveling device. Therefore, there is no need for an offset boom mechanism, and the rear part of the upper body structure can be turned within the width of the traveling device. Thereby, the rear part of the upper body structure can be turned within the width of the traveling device, and the offset boom does not hit the edge of the groove at the time of digging the side groove, so that there is no problem that the digging is deep. Therefore, since the swivel base frame is swung and the work machine is operated in the left-right direction to dig a gutter, deep ditching can be performed using the entire work machine. Third, the work implement is pivotally supported on the front end of the turntable frame in the vertical and horizontal directions,
Since at least the rear largest dimension of the upper body structure is set within the width of the traveling device, the offset boom mechanism is not required, so that the arm cylinder does not protrude from the upper body structure when the work machine is set up. Therefore, when turning,
The rear part of the arm cylinder does not protrude from the width of the traveling device. Therefore, it was possible to dig a gutter by the wall, and furthermore, it became possible to make a turn for loading the excavated earth and sand on a truck on the opposite side of the wall. Fourthly, since the work machine does not require an offset boom mechanism, the work machine is lighter, so that the front-rear balance of the body is not deteriorated. Work and travel at a high speed. Fifth, at least the seat side end of the swivel frame is formed substantially linearly, the seat side front end of the swivel frame is formed substantially linear, and the seat side end of the swivel frame is By configuring the extended intersection portion of the front end on the seat side to be substantially within the turning circle of the rear largest dimension portion of the upper body structure, the extended intersection portion is within the turning circle of the rear largest dimension portion of the upper body structure during turning. Since it does not protrude, the extended intersection does not protrude from within the width of the traveling device at the time of turning, and does not have a problem of contacting an obstacle or the like. Sixth, at least the seat-side end of the swivel frame is formed substantially linearly, the seat-side front end of the swivel frame is formed substantially linear, and the seat-side end of the swivel frame is formed. And the extended intersection between the front end of the seat and the front side of the upper body structure is configured to be within the turning circle of the rear largest dimension part of the upper body structure,
The space at the foot of the seat is widened to the above-mentioned extended intersection portion inside the turning circle, so that a spacious operation space can be secured, and the running operation and the operation of the work machine and the like can be easily performed. Seventh, since the seat-side end of the swivel frame is formed substantially linearly, the operation of aligning the seat-side end of the swivel frame with the outermost portion of the traveling device is performed from the seat to the front side. It is possible to perform while watching. Therefore, when returning the swiveled upper body structure to the running direction, the seat-side end of the swivel frame and the outermost part of the running device can be easily aligned in parallel, and the swiveled upper body structure can be moved. The operation of returning to the direction can be easily performed.

According to a second aspect of the present invention, a swivel frame is pivotally mounted on the traveling device via a swivel bearing, and a seat, an engine, a hydraulic pump, an oil tank and the like are arranged on the swivel frame. An upper body structure is configured, and at the front end of the swivel frame, a work machine is pivotally supported via a work machine pivot portion so as to be operable in the vertical and horizontal directions, and at least a rear largest dimension portion of the upper body structure is provided. In a turning work vehicle within the width of the traveling device, a front end opposite to the seat of the swivel frame protrudes forward from a front end on the seat side, and a front and rear portion opposite to the seat is provided with a boarding / alighting portion connected to the seat. Therefore, the following effect is obtained in addition to the first to fourth effects according to the first aspect.

First, since the boarding and unloading section connected to the seat is provided at the front portion on the opposite side of the seat, the boarding and unloading from the boarding section can be performed. In addition, when entering a narrow place and performing work such as digging a ditch, if it is impossible to get on and off from the seat side, it is possible to get on and off from the getting on and off part connected to the seat on the front part on the opposite side of the seat. Furthermore, it is possible to move from the seat to the getting on / off portion connected to the seat, and it is possible to check the state of excavation work by the working machine. Secondly, since the front end of the swivel frame opposite to the seat protrudes forward from the front end of the seat, and a front and rear portion opposite to the seat is provided with a boarding / alighting portion connected to the seat. It is possible to take it wider, and it becomes easier to pass when getting on and off.
Third, by projecting the front end of the swivel frame opposite to the seat forward from the front end of the seat, the area of the front portion of the swivel frame opposite to the seat is increased, so that the fuel tank and operating The capacity of the oil tank etc. can be increased,
Further, it is possible to obtain a degree of freedom in designing the layout. Fourth, since the front end of the swivel frame opposite to the seat projects forward from the front end of the seat, the front end of the swivel frame at the seat side is located behind the front end of the opposite side to the seat. When excavation work is performed in front of the seat, the front end of the revolving base frame on the seat side does not obstruct the view, and the state of the excavation work can be easily checked.

[Brief description of the drawings]

FIG. 1 is an overall side view of a backhoe according to the present invention.

FIG. 2 is an overall plan view of the backhoe of FIG. 1;

FIG. 3 is a plan view showing the arrangement of each device on the upper part of the swivel frame 2;

FIG. 4 is a plan view of a conventional standard backhoe.

FIG. 5 is a side view of an ultra-small swivel-type backhoe in which a work machine A called a coffee cup type is folded over an upper body structure B to be able to swivel.

FIG. 6 is a plan view of the ultra-small swivel backhoe of FIG. 5;

FIG. 7 is an exploded perspective view of an offset boom mechanism for enabling ultra-small turning.

FIG. 8 is an overall perspective view of an ultra-small turning backhoe in which an engine 11 is disposed on the left and right sides of a center line M on the left and right sides.

FIG. 9 is a side view of the ultra-small swivel backhoe of FIG. 8;

10 is a plan view of the ultra-small swivel type backhoe of FIG. 8 showing the arrangement of the engine 11 and the seat 9. FIG.

[Explanation of symbols]

 Reference Signs List A Working machine B Upper body structure D Walk-through entrance / exit E Left-hand entrance / exit 1 Work implement pivot 2 Turntable frame 7 Hydraulic pump 9 Seat 10 Bonnet 11 Engine 14 Hydraulic oil tank 22 Crawler type traveling device 31 Fuel tank

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Uno 1-32 Chaya-cho, Kita-ku, Osaka City, Osaka Inside Yanmar Diesel Co., Ltd. (56) References JP-A-51-67602 (JP, A) JP-A-61-76850 (JP, U) JP-A-63-71257 (JP, U) JP-A-4-4944 (JP, U) Kaihei 1-75169 (JP, U) JP-A 57-202461 (JP, U) JP-A 1-164337 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02F 9 / 08 E02F 9/16

Claims (2)

(57) [Claims] 1. A swivel frame is pivotally mounted on a traveling device via a swivel bearing, and a seat, an engine, a hydraulic pump, an oil tank, and the like are arranged on the swivel frame to form an upper body structure. Comprising, at the front end of the swivel frame,
In a turning work vehicle, the work machine is pivotally supported via a work machine pivot portion so as to be operable in the up-down direction and the left-right direction, and at least a rear largest dimension portion of the upper body structure is within a width of a traveling device.
At least the seat-side end of the swivel frame is formed substantially linearly, the seat-side front end of the swivel frame is formed substantially linear, and the seat-side end and the seat-side front end of the swivel frame are formed. A turning work vehicle characterized in that an extended crossing portion of the portion is configured to be substantially within a turning circle of a rear largest dimension portion of the upper body structure. 2. A swivel frame is pivotally mounted on a traveling device via a swivel bearing, and a seat, an engine, a hydraulic pump, an oil tank, and the like are arranged on the swivel frame to form an upper body structure. Comprising, at the front end of the swivel frame,
In a turning work vehicle, the work machine is pivotally supported via a work machine pivot portion so as to be operable in the up-down direction and the left-right direction, and at least a rear largest dimension portion of the upper body structure is within a width of a traveling device.
A turning work vehicle characterized in that a front end of a turntable frame opposite to a seat protrudes forward from a front end of a seat, and a front / rear portion opposite to the seat is provided with a boarding / alighting portion connected to the seat.