JP2003239325A - Turning work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a longitudinal balance of a turning base, or to set a swing angle of a boom in the sufficient size while securing a necessary minimum dwelling space and a walk through space even in a small type. <P>SOLUTION: A control box 6 is arranged in a front part of the turning base 2 in front of an operation seat 5. A receiving bracket 17 is projected forward from the forefront surface of the turning base 2 on the front side of this control box 6. A swing bracket 18 is rockingly pivoted around a vertical shaft 19 on this receiving bracket 17. A boom 20 and the base end of a boom cylinder 21 are respectively pivoted on this swing bracket 18 via horizontal shafts 22 and 23. The boom cylinder 21 is arranged on the back face outside of the boom 20. A distance L1 up to the vertical shaft 19 from the turning axis X of the turning base 2 is set almost equal to a distance L2 up to the rear end of the turning base 2 from the turning axis X, and/or a front face of the control box 6 and a vertical shaft bearing part 18A of the swing bracket 18 are approached in the longitudinal direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning work machine such as a backhoe.

[0002]

2. Description of the Related Art For example, in a backhoe, there is a standard machine or a rear small swing machine equipped with an excavating device at the front part of a swivel base as disclosed in Japanese Patent Laid-Open No. 8-134948. In this type of conventional technology, a backhoe control device usually has a control box arranged in front of a swivel front of a driver's seat, and a receiving bracket projects forward from the front of the swivel at the front side of the control box. The swing bracket is pivotally supported on the receiving bracket so as to be swingable about the vertical axis, and the base ends of the boom and the boom cylinder are pivotally supported on the swing bracket via the horizontal axis.

The boom cylinder is arranged on the back side of the boom, and the end connected to the middle part of the boom is inserted into the boom and the boom cylinder is arranged on the outer side of the back of the boom. There is.

[0004]

By the way, in the backhoe, if the swivel base is sufficiently large, it is easy to secure a necessary amount of living space and walkthrough space around the driver's seat. If so, it will be difficult to configure such a space so that normal work can be performed as a backhoe, and if a minimum living space and walk-through space are secured, the front-rear balance of the swivel base deteriorates. Or, the swing angle of the boom may become smaller.

An object of the present invention is to provide a swing working machine capable of solving such various problems. According to the present invention, the boom cylinder is arranged outside the back surface of the boom, and the distance from the swing axis of the swivel base to the vertical axis is set to be substantially equal to the distance from the swing shaft center to the rear end of the swivel base, and Or, by making the front surface of the control box and the vertical axis bearing portion of the swing bracket close to each other in the front-rear direction, a swivel base after securing a minimum required living space, walkthrough space, etc. It is an object of the present invention to provide a revolving work machine capable of achieving good front-rear balance or setting a swing angle of a boom to a sufficient size.

[0006]

The first specific means for solving the problems in the present invention is to arrange a control box 6 in front of the swivel base 2 in front of the driver's seat 5, and to control the control box 6.
On the front side of the swivel base 2, a receiving bracket 17 is projected forward from the front surface of the swivel base 2, and a swing bracket 18 is pivotally supported on the receiving bracket 17 so as to be swingable around a vertical axis 19. The base ends are pivotally supported via horizontal shafts 22 and 23, respectively, and the boom cylinder 21 is arranged outside the back surface of the boom 20, and a distance L1 from the rotary shaft center X of the swivel base 2 to the vertical shaft 19 is set. The distance L2 from the swing axis X to the rear end of the swivel base 2 is set to be substantially equal, and / or the front surface of the control box 6 and the vertical axis bearing portion 18A of the swing bracket 18 are close to each other in the front-rear direction. Is.

As a result, even if the swivel base 2 is downsized after ensuring the minimum required living space, walkthrough space, etc., the front-rear balance of the swivel base 2 can be maintained well, or the boom 20 and the boom 20 can be boomed. It is possible to set the swing angle of the boom 20 to a sufficient size while bringing the cylinder 21 as close to the front surface of the control box 6 as possible, which leads to downsizing of the swivel base 2. The second specific means for solving the problem in the present invention is that, in addition to the first specific means, the front surface of the control box 6 projects forward from the front end of the swivel base 2.

As a result, the control box 6 is mounted on the swivel base 2.
The living space between the driver's seat 5 and the control box 6 can be expanded by the amount of the portion projecting forward from the front end, the walkthrough can be improved, or the swivel base 2 can be downsized. A fourth concrete means for solving the problem in the present invention is that, in addition to the first or second concrete means, the front surface of the control box 6 is formed in a convex shape and the back surface is formed in a concave shape. Is. As a result, the living space between the driver's seat 5 and the control box 6 can be reasonably expanded, the walkthrough can be improved, or the swivel base 2 can be downsized.

A fifth specific means for solving the problems in the present invention is, in addition to any one of the first to third specific means, the cross-sectional shape of the boom 20 is set to have an aspect ratio of about 1: 1. Is what you are doing. As a result, the swing angle of the boom 20 can be set to a sufficient size, the control box 6 is arranged at the front end of the swivel base 2, and the living space, walk-through space, or the like is enlarged, or the swivel base 2 is expanded. Can be miniaturized.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 3 and 4, reference numeral 1 is a rear small turning type backhoe which is illustrated as a turning work machine, and the backhoe 1 is mounted on the crawler traveling device 4, an upper body 30 having a turning base 2, and the turning base 2. It is mainly composed of a device 3. The crawler traveling device 4 includes drive wheels on the front and rear portions of the left and right side frames 31 of the truck frame.
A driven wheel and a plurality of rollers in the middle thereof are rotatably supported, a rubber or iron crawler 32 is wound around these, and the drive wheel is driven by a traveling drive source such as a hydraulic left and right traveling motor 33. It is configured.

The left and right side frames 3 are track frames.
1 is movably supported in the left-right direction and is moved by a hydraulic cylinder, and the left-right crawler traveling device 4 has variable legs. When the crawler traveling device 4 is set to the widest leg,
The distance from the turning axis X to the outer ends of the left and right crawler traveling devices 4 is approximately the same as or slightly longer than the maximum radius of the turning base 2, and may be set to be about 10% longer. When the crawler traveling device 4 is the narrowest leg, the distance from the turning axis X to the outer ends of the left and right crawler traveling devices 4 is the turning axis X.
To the left and right side surfaces of the swivel base 2 are substantially the same or slightly longer, and may be set to be about 10% longer.

A swivel base 2 is mounted on the upper part of the track frame via a swivel bearing 34, and the swivel base 2 is rotatable left and right around a swing axis X by a swing motor. A dozer 35 is mounted on the front part of the track frame so as to be vertically movable via a dozer cylinder 36. The swivel base 2 is formed by welding a frame, a vertical wall, a support base, etc. on a base plate 2A as a base, and a balance weight 37 forming the rear end of the swivel base 2 is provided at the rear end thereof.

On the swivel base 2, an engine 38, a fuel tank 39, an oil tank 40, a hydraulic pump 41 driven by the engine 38, a radiator 42, a battery 43 arranged on the oil tank 40, and a bonnet 44 covering them. , A driver's seat 5 mounted on the hood 44, and a control box 6 arranged in front of the driver's seat 5.
Etc. are mounted, and the upper body 30 is formed by these. The oil tank 40 is a balance weight 3
The hydraulic pump 41 is provided inside or on the front side of the hydraulic pump 7 and has a pilot pressure hydraulic pump for supplying pilot oil to the operating means, in addition to a main pump for supplying hydraulic oil to various actuators.

The front side of the driver's seat 5 of the swivel base 2 is step 45.
The excavation device 3 is mounted on the front portion of the base plate 2A via a receiving bracket 17 so as to be swingable about a vertical axis 19. 1 to 6, the control box 6 is arranged in front of the driver's seat 5 and in the front part of the swivel base 2, and accommodates therein almost everything necessary for control. Reference numeral 12 is a frame frame having a gate shape in a front view. A pilot valve 8 as an operating means and an oil passage manifold 10 are attached to an upper portion of the frame frame 12, and a large number of control valves 9 are provided in an intermediate portion below the oil passage manifold 10.
Are arranged, the lower part supports the pedal relationship, and the box cover 7 covers them all.

The positions of the pilot valve 8 and the control valve 9 in the box cover 7 are not the same in the front-rear direction, and the center 9S of the control valve 9 in the front-rear direction is displaced forward of the center 8S of the pilot valve 8.
The spool 9a of the control valve 9 is located approximately in the middle of the valve body in the front-rear direction, and hydraulic pipes or links for operating pilot oil are connected to the upper and lower ends of the spool 9a. If they are located directly under the pipes, they will become obstacles, making it difficult to connect hydraulic pipes or links.

As described above, simply by slightly shifting the control valve 9 from the pilot valve 8 to the front side, piping work on the upper portion of the control valve 9 becomes easy, and
By moving the control valve 9 forward, the distance from the driver's seat 5 to the control valve 9 becomes longer, and even if the pipe 11C is connected to the rear surface of the control valve 9,
The part most required as a living space can be expanded and the walkthrough will be good. That is, by displacing the control valve 9 to the front side, the rear surface of the control box 6 (rear surface of the rear cover 7R) is formed in a concave shape, and even if the front-back dimension of the control box 6 is the same as the conventional one, the middle part of the vertical direction is moved to the front side. It is deviated to form a pocket on the rear side, and the distance from the driver's seat 5 is increased to expand the living space between the driver's seat 5 and the control box 6 for good walkthrough.

The pipe 11 connecting the control valve 9 and the manifold 10 has a pipe 11A connected to the lower side of the control valve 9 arranged along the front surface of the control valve 9 and connected to the upper side of the control valve 9. The connected pipe 11B extends almost directly above the control valve 9. Piping 11C for connecting the control valve 9 to the hydraulic pump 41 and the oil tank 40
Are extended downward from the rear surface of the control valve 9. The pipes 11 can be operated and maintained by removing the box cover 7.

Along with the displacement of the control valve 9 to the front side, the left and right frame side plates 13 of the frame frame 12 are displaced from the lower part to the upper part to the rear and the middle part to the front, respectively. The left and right sides on the front side of the pilot valve 8 and the left and right sides on the rear side of the control valve 9 can be opened without being obstructed by the frame frame 12, and the front side of the pilot valve 8 and the upper side of the control valve 9 and the pilot valve 8 can be opened. The lower side of the control valve 8 and the rear side of the control valve 9 are shaped so as to facilitate maintenance.

The box cover 7 has a front cover 7F and a rear cover 7R, which are separable from each other in the front and back, and are attached to the swivel base 2 individually and detachably. The front and rear split surfaces P of the front and rear covers 7F and 7R have a shape in which a midway portion is located in front of the upper portion. That is, the side surface is formed in a substantially S shape (right side surface S shape, left side surface inverted S shape), and the split surface forming edges of the front cover 7F and the rear cover 7R are wavy and angular. Not in. By forming the front-rear split surface P of the box cover 7 into a substantially S-shape, the front-rear split surface P is formed.
Can be substantially aligned with the front and rear central positions of the pilot valve 8 and the control valve 9. As a result, when the front cover 7F is opened, the pilot valve 8 and the control valve 9 are not interfered with by the rear cover 7R and by the front cover 7F when the rear cover 7R is opened. Front side or rear side maintenance is possible.

When the front cover 7F is opened by forming the front and rear split surfaces P in a substantially S shape, the front surface of the pilot valve 8 and the upper side of the control valve 9 can be largely opened, and the rear cover 7R is opened. Then, the lower part of the pilot valve 8 and the lateral side of the rear face of the control valve 9 can be largely opened, and the front and rear faces can be opened intensively instead of being opened uniformly in the vertical direction, and the portions requiring maintenance can be opened for easier maintenance. . After displacing the control valve 9 to the front side, the front surface of the control box 6 is projected forward from the front end of the swivel base 2 to form the front surface of the control box 6 (the front surface of the front cover 7F) in a convex shape. The control box 6 as a whole is deviated to the front side as compared with the conventional one, and the distance from the front end of the driver's seat 5 and the hood 44 to the rear surface of the control box 6 is made larger to expand the living space.

When viewed from the front, the control box 6 has a wide upper portion and a narrower width from the middle portion to the lower portion, and the left and right pedals 59, 60, 61 and the like arranged in the lower portion are prevented from being too wide. ing. A pair of left and right pilot valves 8 are attached to the frame upper plate 14 to form an assembly, and both ends of the frame upper plate 14 are fixed to the left and right frame side plates 13.
In addition, the manifold 1 is provided above the left and right frame side plates 13.
Since 0 is connected and the control valve 9 is connected in the middle, not only is the frame 12 shaped like a gate, but the left and right frame side plates 13 are also connected by the control valve 9 and the manifold 10 even at two places in the middle. As a result, they can reinforce each other to form a rigid attachment and a robust frame and frame structure.

As the control valve 9, both hydraulic type and mechanical type (mechanical type in which operating force is transmitted via a link or the like) are used, and all the control valves 9 operate many valve bodies. The plural spools 9a of the respective valve bodies are arranged in the vertical direction, and the spools 9a are arranged in parallel with each other.
The control valve 9 includes, for example, a swing valve 9A for a swing motor, an arm valve 9B for an arm cylinder 49, a boom valve (elevating valve) 9C for a boom cylinder 21, and a bucket valve (scooping / dump valve) for a bucket cylinder 51. ) 9D, a traveling left valve 9E and a traveling right valve 9F for the left and right traveling motor 33, a dozer valve 9G for the dozer cylinder 36, a switching valve 9H for the service port, a shift valve 9J for the left and right traveling motor 33,
Swing cylinder 5 swinging the swing bracket 18
All of the control valves including a swing valve 9K for two and controlling various actuators mounted on the backhoe 1 are provided adjacent to each other. The arrangement order of these control valves 9 is appropriately set as needed.

The traveling left valve 9E and the traveling right valve 9
F, the dozer valve 9G, the speed change valve 9J, the switching valve H, etc. are mechanical control valves,
It is manually operated via the arm and the operation lever or the operation pedal. On the other hand, the swing valve 9A,
Since the arm valve 9B, the boom valve 9C, the bucket valve 9D, the swing valve 9K, and the like require frequent and delicate operations, pilot hydraulic control valves are used, and a hydraulic pump 41 driven by the engine 38 is used. It is possible to hydraulically operate with pilot pressure oil.

Blocks 53A and 53B are connected to both ends of the control valves 9A to 2K so as to sandwich them, and a pump port P and a tank port T of a main circuit are formed in both blocks 53A and 53B. , Main pipe and drain pipe (pipe 11 shown in FIG.
C) and are connected. Further, all the control valves 9A to 2K and the left and right blocks 53A and 53B are attached in a state of being sandwiched by a pair of left and right frame side plates 13, and also serve to connect the upper and lower midway portions of the left and right frame side plates 13.

The oil passage manifold 9 has a pair of left and right pilot valves 8 fixed to the upper surface, and an oil passage switching unit 15 for switching the oil passage connection pattern between the pilot valve 8 and the control valves 9A to 2K is attached to the lower surface. Is configured. The oil passage manifold 9 is formed by arranging two blocks so as to face each other with one intermediate plate interposed therebetween, and forms a large number of oil passages connecting them between the pilot valve 8 and the oil passage switching unit 15. There is. The left and right pilot valves 8 each have one operating lever 55. The left operation lever 55 is for turning / arm, the right operation lever 55 is for boom / bucket, each operation lever 55 can be swung left / right and front / back, and each pilot valve is reciprocally swung in one direction. Two valve bodies 8 can be operated alternatively or simultaneously.

Both ends of the frame upper plate 14 are fixed to the upper portions of the left and right frame side plates 13, and the frame upper plate 14 supports not only the pilot valve 8 but also the left and right traveling operation levers 56. Left and right traveling operation lever 5
Reference numeral 6 constitutes a part of the operating means, and is connected to the spools of the left and right traveling valves 9E and 9F via a link arm or the like. The oil passage switching unit 15 is for switching the oil passages between the pilot valve 8 and the control valve 9 to change the combination, and one spool is held in the flat unit body, and the unit body has an outer surface. It is slidable in the axial direction by a switching lever arranged.

An unload valve 57 is provided on the lower surface of the oil passage manifold 10 and is connected in parallel with a pilot oil passage extending from the hydraulic pump 41 to the pilot valve 8. 57A is an operation lever of the unload valve 57, and by rotating, the pilot pressure oil is discharged to make the pilot valve 8 inoperable, and even if the operation lever 55 is unintentionally swung, the excavation device 3 is prevented. I try not to work. The left and right frame side plates 13 of the frame frame 12 are base plates 1 for attaching to the swivel base 2 at the lower left and right sides.
2A, and cylindrical bodies 58A, 5A near the base plate 12A on the left side.
8B is provided, the bed 58A is pivotally supported by the bedal turning shaft that is interlocked with the switching valve 9H, the service pedal 59 is attached to the bedal turning shaft, and the tube 58B is linked with the shift valve 9J. A gear shift pedal 60 for switching between traveling first and second speeds is mounted on the pedal rotation shaft which pivotally supports the rotation pedal shaft.

A cylindrical body 58 is provided near the right base plate 12A.
C is provided, and a pedestal rotation shaft linked to the swing valve 9K is pivotally supported on the cylinder 58C, and a swing pedal 24C is attached to the pedestal rotation shaft. A lever shaft 62 is pivotally supported on the middle portion of the right frame side plate 13 and the manifold 10 via a stay, and a dozer lever 63 is provided at the outer end of the lever shaft 62.
Can be operated. The excavator 3 pivotally supports the swing bracket 18 supported by the receiving bracket 17 via the vertical axis 19 so that the base ends of the boom 20 and the boom cylinder 21 can be raised and lowered via the horizontal axes 22 and 23. The arm 48 is pivotally supported at the tip of the boom 20 and an arm cylinder 49 is provided.
The bucket (working tool) 50 is pivotally supported on the tip of the arm 48 to enable the bucket cylinder 51 to scoop (scrap) and dump.

The receiving bracket 17 projects forward from the front surface (frontmost end) of the swivel base 2 on the front side of the control box 6, and the control box 6 is located substantially in the center in the left-right direction. 17 is displaced to the left and right side (right side). Distance L1 from the turning axis X of the turning base 2 to the tip of the receiving bracket 17 or the vertical axis 19.
Is set to be substantially equal to or shorter than the distance L2 from the turning axis X to the rear end of the turning base 2, and the distances L1 and L2 are set.
Is preferably substantially the same as or smaller than the distance from the turning axis X to the outer end of the crawler 32 when the crawler traveling device 4 has wide legs.

Since the swivel work machine 1 is small, the swivel base 2
Is extremely small, the width of the swivel base 2 is about twice the width of the standard size driver's seat 5, and the front part of the driver's seat 5 is close to the swivel axis X, and in front of the hood 44. The engine 38 is arranged closer to the turning axis X as the position of the portion overlaps the turning axis X. The forward projection amount of the receiving bracket 17 from the front surface of the swivel base 2 is preferably as small as possible in order to improve the front-rear balance of the swivel base 2. Therefore, the distance L1 should be set to the distance L2 or less. Is required.

The boom 20 is bent like a dogleg,
A mounting plate 20A is fixed to the outer surface of the bent portion, the base of the tube of the boom cylinder 21 is pivotally supported by the mounting plate 20A, and the boom cylinder 21 is arranged outside the rear surface of the boom 20. The state in which the back surface of the boom 20 is substantially parallel to the boom cylinder 21 is the state in which the boom 20 is lifted up and is most folded, and in this state, the control box 6 does not come into contact with the boom cylinder 21. 6 is arranged as frontward as possible with respect to the swivel base 2, the amount of protrusion of the receiving bracket 17 from the swivel base 2 is reduced, and the front surface of the control box 6 is connected to the vertical axis bearing portion 18A of the swing bracket 18 and the front-back direction. Close to.

As shown in FIG. 6, the boom 20 has a sectional shape and an aspect ratio of approximately 1: 1. Boom cylinder 2
When the tube base of No. 1 is thrust into the boom 20 and is pivotally supported, a hole is formed in the rear surface of the boom 20, so it is necessary to widen the width to secure the strength.
When 1 is arranged on the outer side of the rear surface of the boom 20, sufficient strength can be secured even if the boom width is narrow. In FIG. 6, the boom 20 is moved to the left and right by one-dot chain line and two-dot chain line.
The figure shows a state in which the boom cylinder 21 is swung at an angle of about 0 degrees, and the boom cylinder 21 has a smaller dimension in the left-right direction than the boom 20, and the boom 20 is formed narrow as described above. Sometimes the distance extending from the boom center Y to the rear side becomes shorter.

That is, by arranging the boom cylinder 21 on the rear side of the boom 20 and forming the boom 20 with a narrow width, the swing angle of the boom 20 can be increased.
The distance from the tip of the swivel base 2 to the vertical axis 19 can be shortened,
The amount of protrusion of the control box 6 from the tip of the swivel base 2 can be increased, and / or the tip of the swivel base 2 and the control box 6 can be further away from the swivel axis X. Living space between driver's seat 5 and control box 6 while maintaining good balance (especially underfoot space)
Can be enlarged without difficulty, and the walkthrough can be improved.

The back hoe 1 described above employs various configurations in order to reduce the size while ensuring the minimum necessary living space. That is, the driver's seat 5 has a size required for driving, and the operating lever 55 and the traveling operating lever 5 are removed from the driver's seat 5.
Engine 6 with the required horsepower with the distance up to 6 as the proper distance
8. A fuel tank 39, an oil tank 40, a hydraulic pump 41, a radiator 42, a battery 43, etc. having a proper capacity are mounted on the swivel base 2, and these are covered with a bonnet 44 as small as possible. Is placed.

In the front-rear direction, the rear end of the driver's seat 5 is substantially aligned with the bonnet 44 forming the rearmost end of the swivel base 2 and the rear end of the balance weight 37, and the front end of the driver's seat 5 is separated from the front end of the bonnet 44. Rear side, bonnet 44
The front portion of the driver seat 5 is substantially overlapped with the turning axis X, and the front end of the driver's seat 5 is close to the turning axis X. Further, in the left-right direction, the left and right widths of the hood 44 and the swivel base 2 are set to the driver's seat 5
Is slightly wider than the left and right width of the swivel base, the swivel base 2 is formed in a substantially front and rear circular shape, the control box 6 is disposed at the substantially left and right center of the front end of the swivel base 2, and the receiving bracket 17 of the front end face of the swivel base 2 is formed. It is provided from the center to the right.

In order to provide the backhoe 1 with necessary functions and to make it as small as possible, the backhoe 1 is constructed as described above and then has the following construction. The boom cylinder 21 is arranged on the outside of the rear side of the boom 20, and the side closer to the control box 6 is used as the boom cylinder 21 that is narrower than the boom 20. The boom cylinder 21 is provided on the rear side of the boom 20 so that the width of the boom 20 can be reduced. It has an outer arrangement that does not insert, especially
The boom 20 has a cross-sectional shape set to have an aspect ratio of about 1: 1 and a width sufficiently narrower than that of the prior art, so that the boom 20 and the boom cylinder 21 can be brought as close to the front surface of the control box 6 as possible. The swing angle of 20 can be set to a sufficiently large size, or the control box 6 can be arranged further forward.

Further, from the turning axis X of the turning base 2 to the vertical axis 19
Is set to be substantially equal to the distance L2 from the turning axis X to the rear end of the swivel base 2, and the distance L2 from the driver's seat 5 to the rear end of the swivel base 2, the driver's seat 5, the bonnet 44 and the swivel shaft. After shortening the positional relationship with the heart X as much as possible, the vertical axis 19
By shortening the distance L1 up to, the front-rear balance of the swivel base 2 is favorably maintained, and the maximum turning radius of the ultra-small turning machine is reduced. Further, the front surface of the control box 6 and the vertical axis bearing portion 18A of the swing bracket 18 are close to each other in the front-rear direction, and the vertical axis bearing of the swing bracket 18 is set to the control box 6 specified for the driver's seat 5. By making the parts 18A close to each other, the front-rear balance of the swivel base 2 is maintained well, the maximum turning radius of the ultra-small turning machine is reduced, and conversely, the control box 6 is arranged on the front side, so that the driver seat 5 This makes it possible to make the front living space, walk-through space, etc. wider.

Furthermore, the front surface of the control box 6 projects forward from the front end of the swivel base 2, and the living space between the driver's seat 5 and the control box 6 can be expanded by the amount of the front projection. , Walk-through is also improved, and the swivel base 2 is increased by the amount that the control box 6 projects forward.
If the height is reduced, the swivel base 2 can be downsized. Further, when the front surface of the control box 6 is formed in a convex shape by displacing the center 9S of the control valve 9 in the front-rear direction to the front side of the center 8S of the pilot valve 8, the rear surface of the control box 6 may be formed in a concave shape. Becomes possible,
The living space between the driver's seat 5 and the control box 6 can be expanded, and the walkthrough can be improved. On the contrary, the control box 6 can be displaced rearward or the swivel base 2 can be reduced by that amount. Will be possible.

Each of these configurations can exhibit one or more respective functions without combining all of them, and in the case of having a plurality of functions, one of them can be pressed to make the other stand out, or both can be operated little by little. It can be done. The present invention is not limited to the above-mentioned embodiment, but can be modified in various ways. For example, backhoe 1
Remove the control box 6 from the swivel base 2,
The mechanical control box can be attached using the crawler traveling device 4 and the like as they are.

In this case, in the mechanical control box, the swing valve 2A, the arm valve 2B, the boom valve 2C and the bucket valve 2D are mechanically used like other control valves, and the pilot valve 8, the oil passage switching unit, Frame frame 1 without hydraulic manifold 9 etc.
Two operation levers (operation means) are supported by 2, and the two operation levers are interlockingly connected to operate the mechanical swing valve 2A, arm valve 2B, boom valve 2C, and bucket valve 2D. In the backhoe 1, the swivel base 2 is commonly used, and the control box 6 can be selected from a hydraulic type and a mechanical type, and the crawler traveling device 4 can be changed between a wide leg and a variable leg and a fixed leg width can be selected. Since it is not necessary to consider that the base 2 also has a space for disposing the control valve 9, it is possible to appropriately set the size of the front side and the size of the rear side from the turning axis X.

[0041]

According to the present invention described in detail above, after securing the minimum necessary living space, walkthrough space, etc.,
Even if the swivel base 2 is downsized, the front-rear balance of the swivel base 2 can be maintained well, or the boom 20 and the boom cylinder 2 can be maintained.
It is possible to set the swing angle of the boom 20 to a sufficiently large value while bringing 1 as close to the front surface of the control box 6 as possible, and it is also possible to downsize the swivel base 2.

[Brief description of drawings]

FIG. 1 is a side view showing a control box of a swing work machine.

FIG. 2 is a side view showing a front portion of the swing work machine.

FIG. 3 is a side view showing the entire swivel work machine.

FIG. 4 is a plan view of a turning work machine.

FIG. 5 is a rear view of the control box.

FIG. 6 is an explanatory plan view showing a relationship between a control box and a boom.

[Explanation of symbols]

1 Swivel work machine (backhoe) 2 swivel base 3 drilling equipment 4 Crawler traveling device 5 driver's seat 6 control box 7 box cover 8 Pilot valve (operating means) 8S Pilot valve center in the front-rear direction 9 control valve Center of 9S control valve 10 manifold 11 piping 12 frame 13 Frame side plate 14 frame upper plate 17 Support bracket 18 swing bracket 18A vertical axis bearing 19 Vertical axis 20 boom 21 boom cylinder 22 Horizontal axis 23 Horizontal axis L distance P split surface X rotation axis

Continued front page    (72) Inventor Masanaga Shintani             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory F-term (reference) 2D015 EB01 EB02

Claims (4)

[Claims] 1. A steering box is arranged in front of a swivel base in front of a driver's seat, and a receiving bracket is projected forward from the forefront of the swivel at the front side of the steering box, and a swing bracket is vertically swung on the receiving bracket. The boom and the boom cylinder are pivotally supported on the swing bracket via the horizontal axis, respectively, and the boom cylinder is arranged on the outer side of the rear surface of the boom. Is set to be substantially equal to the distance from the turning axis to the rear end of the turning base, and / or the front surface of the control box and the vertical bearing of the swing bracket are brought close to each other in the front-rear direction. A swivel work machine characterized by being installed. 2. The swivel work machine according to claim 1, wherein a front surface of the control box extends forward from a front end of a swivel base. 3. The swivel work machine according to claim 1, wherein the control box has a front surface formed in a convex shape and a back surface formed in a concave shape. 4. The swiveling work machine according to claim 1, wherein a cross-sectional shape of the boom is set to have an aspect ratio of approximately 1: 1.