JP2002004319A - Back hoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the whole body of a back hoe compact by shortening the distances from the center to the left and right side sections of the turning base of the back hoe. SOLUTION: This back hoe is constituted in such a way that the turning base 1 mounted with a driver's cab 2 is turnably provided on a traveling machine base 4 having left and right crawler traveling devices 5 and the boom 6 of an excavating device A is provided in a leftwardly and rightwardly turnable state in front of the driver's cab in the front section of the turning base 1. In the lateral direction of the turning base 1, the driver's cab 2, a control lever group 31, and the boom 6 are closely arranged in such a way that the centers of the cab 2 and group 31 in the lateral direction are shifted to the left or right side and the boom 6 is shifted to the right or left side from the center of the base 1 in the lateral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backhoe in which a boom can swing right and left.

[0002]

2. Description of the Related Art In a conventional backhoe, FIG.
As shown in the figure, a turntable 1 'is pivotably supported on a traveling machine base having a left and right crawler traveling device 5'.
An excavation work device A 'is connected to the left and right intermediate portion at the front of the excavation work device A', and a cockpit 2 'and a control lever group 31' are disposed behind the excavation work device A '. 3 'is mounted, and the engine 3' is mounted with its output axis P 'along the left-right direction of the swivel 1'.

The cockpit 2 'is arranged at a position where the center in the left-right direction substantially coincides with the center in the left-right direction of the turntable 1' together with the control lever group 31 'in front of the cockpit 2'. 1 'is slightly shifted to the right with respect to the center in the left-right direction. In the backhoe, the cockpit 2 'and the control lever group 31' are arranged at the center in the left and right direction of the turntable to facilitate traveling control, and the excavation work device A 'is shifted from the center in the left and right direction of the turntable to perform work. The condition is easy to see.

[0004]

However, if only the excavator A 'is shifted rightward from the center of the swivel 1' to the right as in the prior art, the swivel 1 'will be It must be wide from the center to the right, or the cockpit 2 'and the control levers 3
It may be difficult to shift the excavator 1 'and the excavator A' sufficiently in the left-right direction until the work state becomes easy to see. In order to narrow the right half of the swivel base 1 ', the excavating work device A' is arranged at the center of the swivel base 1 'in the left-right direction, and the cockpit 2' and the control lever group 31 'are positioned at the center of the swivel base 1' in the left-right direction. From the center of the swivel 1 'in the left-right direction to the left, it is difficult to configure the entire backhoe into a compact type with a small width. It is difficult to shift the state to a state where the state is easy to see.

In the prior art, the cockpit 2 'and the control lever group 31' and the boom 6 'overlap in the left-right direction, and when the boom 6' is raised to a standing posture, the control lever is raised. Since it interferes with the group 31 ′, it is difficult to ascend to the upper side of the swivel base 1 ′. In order to prevent this interference and enable the boom 6 ′ to tilt backward,
The cockpit 2 'and the control lever group 31' are separated rearward from the front end of the turntable 1 ', which also causes the turntable 1' to be longer in the front-rear direction. The present invention shifts the center of the cockpit and the control lever group in the left-right direction to one of the left and right sides with respect to the center of the swivel table in the left-right direction, and shifts the boom to the other side.
It is an object of the present invention to provide a backhoe in which the distance from the center to the left and right sides of the swivel base can be reduced to make the swivel stand compact.

According to the present invention, the working state can be sufficiently viewed by shifting the center of the cockpit and the control lever group in the horizontal direction to the left and shifting the boom to the right with respect to the horizontal center of the turntable. Therefore, the distance from the center to the left and right sides of the swivel can be shortened, and the control levers can be arranged in a non-overlapping state with the boom in the left and right direction and as close to the front end of the swivel as possible. It is an object of the present invention to provide a backhoe that can be made compact.

[0007]

A first concrete means for solving the problem in the present invention is a left and right crawler traveling device 5.
A swivel 1 on which a cockpit 2 is mounted is provided on a traveling machine base 4 having a swingable structure, and a boom 6 of an excavating work device A is swingable left and right in front of the swivel 1 and in front of the cockpit 2. Provided,
The cockpit 2 and the control lever group 31 and the boom 6 are arranged close to each other in the left-right direction of the swivel base 1, and the left-right center of the control seat 2 and the control lever group 31 is positioned with respect to the left-right center of the swivel base 1. That is, the boom 6 is shifted to one side, and the boom 6 is shifted to the other side.

Thus, even if the cockpit 2 and the control lever group 31 and the boom 6 are arranged close to each other, they are slightly shifted in the opposite direction from the center of the swivel 1 in the left-right direction, and from the swivel 1 to each. The shift amount is at least as large as the shift amount between the two, so that the working state can be sufficiently viewed, and the distance from the center of the swivel base 1 to the left and right sides can be shortened. A second concrete means for solving the problem in the present invention is that a swivel 1 on which a cockpit 2 is mounted is rotatably provided on a traveling machine 4 having a left and right crawler traveling device 5, and a front part of the swivel 1. The boom 6 of the excavating work device A is provided in front of the cockpit 2 so as to freely swing left and right, and the cockpit 2 and the control lever group 31 and the boom 6 are arranged close to each other in the left-right direction of the swivel table 1. The left and right centers of the cockpit 2 and the control lever group 31 are shifted to the left and the boom 6 is shifted to the right with respect to the center of the table 1 in the left and right direction, so that the control lever group 31 and the boom 6 are not overlapped in the left and right direction. It is to be arranged in.

Thus, even if the cockpit 2 and the control lever group 31 and the boom 6 are arranged close to each other, they are slightly shifted in the opposite direction from the center of the swivel 1 in the left-right direction, and from the swivel 1 to each. The amount of shift is at least as large as the amount of shift between the two, so that the working state is sufficiently easy to see, the distance from the center of the swivel base 1 to the left and right sides can be shortened, and the boom 6 is moved above the swivel base 1 Even if it does, it does not interfere with the control lever group 31 and does not hinder the control of the pilot. A third specific means for solving the problem in the present invention is that, in addition to the first or second specific means, a cover 28 for covering the engine 3 is protruded from the swivel base 1 in a plan view. This cover 28
The cockpit 2 is arranged on the upper surface of the vehicle.

Thus, even if the cover 28 and the cockpit 2 are arranged on the swivel platform 1, the overall front and rear length can be made compact. A fourth concrete means for solving the problem in the present invention is the above-mentioned cover 28 in addition to the third concrete means.
That is, the fuel tank 12 and the hydraulic oil tank 13 are separately arranged on both left and right sides of the inside. Thereby, even if the fuel tank 12 and the hydraulic oil tank 13 are arranged in the cover 28, the left, right, front and rear lengths can be made compact and the arrangement balance of the swivel base 1 can be improved.

A fifth concrete means for solving the problem in the present invention is, in addition to any one of the first to fourth concrete means, a swivel on the rear side of the boom 6 and on the front side of the cockpit 2. Step surface 2 communicating with the left and right sides of swivel 1
9 is formed. Thereby, the swivel 1
It is easy to get on and off from the left and right sides, and workability can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS.
Excavation work equipment A is connected to the left and right intermediate part at the front of
A cockpit 2 is arranged behind the excavation work device A, and an engine 3 is mounted on a rear portion of the swivel 1 to form a backhoe. In addition, 4 is a traveling machine stand and 5 is a crawler traveling device. The excavation work device A is configured to include a boom 6, an arm 7, and a bucket 8, and furthermore, the boom 6 is in a retracted state in a retracted state as shown in FIG. It is configured to be held by people.

As shown in FIG. 4, the arm 7 of the excavating work device A is formed by welding a main frame 7A having a U-shaped cross section and an auxiliary frame 7B for closing the open side thereof, and both end edges of the auxiliary frame 7B. The portion 7a is bent toward the bucket 8 over its entire length, and when the timber or the large stone is held and held by the bucket 8 and the arm 7, the bend of the arm 7 is prevented and the held timber is provided. It is designed to prevent slipping. As shown in FIG. 5, a rib 7b may be formed to protrude over the entire length of the arm 7 on each of the three surfaces of the main frame 7A of the arm 7 to further increase the strength of the arm 7.

As shown in FIGS. 1 and 2, the engine 3 is disposed on the turntable 1 behind the excavator A so that the output axis P thereof extends along the front-rear direction of the turntable 1. A radiator 9 is provided behind the engine 3. The radiator 9 is of an extrusion type, which discharges air sucked from the front of the fuselage through the engine 3 to the rear to avoid a rise in the temperature around the cockpit 2 and to rotate the excavator A for the excavating work device A with the suction. The valves 10 arranged at the front of the table 1 can be cooled.

As shown in FIG. 2, utilizing the fact that the engine 3 is disposed in the front-rear direction and the radiator 9 is positioned behind the engine 3 as described above, a relatively low bulk is provided on the opposite side. The end of the output shaft and the pumps 11 for the digging operation device A attached to the end of the output shaft are inserted under the cockpit 2. By reducing the size, the turning radius can be shortened, and as a result, as shown in FIG. 3, the turning table 1 does not protrude to the side of the crawler traveling device 5 during turning, thereby improving workability in a narrow place. is there.

As shown in FIG. 1, the left and right lengths of the swivel platform 1 are provided on the left and right sides of the engine 3 by utilizing the fact that the engine 3 is vertically installed to allow a relatively large space. The large-capacity fuel tank 12 and hydraulic oil tank 13 are allocated and arranged without increasing the number of fuel tanks. That is,
In view of the fact that the engines 3 are not all bulky but vary in bulk along the output shaft P in particular, the engine 3 is arranged with the output shaft P along the front and rear direction of the swivel 1. ,
By disposing the radiator 9 behind the engine 3, the relatively bulky radiator 9 and the subsequent bulky portion of the output shaft end and the pump portion attached thereto are removed except for the bulky portion at the center of the engine 3. By allowing the lower part to enter the cockpit 2 below, the length of the swivel base 1 in the front-rear direction can be shortened as much as possible. By arranging the fuel tank 12 and the hydraulic oil tank 13 separately in the portion, the relatively large-capacity tanks can be compactly mounted on the swivel 1 without increasing the installation area of the swivel 1 in the front-rear direction. It has made it possible.

Thus, while the part of the engine 3 is inserted under the cockpit 2 to shorten the size of the swivel 1 in the front-rear direction, it is possible to avoid the trouble of mounting the tanks. As a whole, the turning radius of the turning table 1 is further reduced so that the workability in narrow places can be improved. The backhoe will be described in more detail with reference to FIGS. The swivel base 1 is rotatably provided on the traveling machine base 4 having the left and right crawler travel units 5, and an excavation work device A is provided at the front of the swivel base 1 via a pivotal support 25 so as to be swingable right and left.

The swivel 1 has left and right side edges 2 substantially parallel to each other.
0L and 20R are formed, and the side edge portions 20L and 20R are formed.
R is in a state along the front-rear direction and not projecting left and right outward from the outer end 21 of the left and right crawler traveling device 5 (non-projection state) in the forward posture of FIG. The side edge 20
The operator can visually recognize the turning posture of the turntable 1 from above the cockpit 2 depending on the angle between L and 20R with a structure or the like (building, wall, bank, etc.). The swivel 1 has a rear edge 22 formed in an arc shape, and when the swivel 1 is turned 90 degrees from the front position in the horizontal position in FIG. 3 (in FIG. 3, the outermost end of the arc-shaped rear edge 22 of the swivel 1 is shown in a state substantially coincident with the outer end 21 of the crawler traveling device 5). Since the trailing edge 22 does not project from the outer end 21 of the left and right crawler traveling device 5,
At the time of turning 90 degrees in the horizontal position, the crawler traveling device 5 can be brought closer to a structure or the like, and workability in a narrow place can be improved.

The support bracket 3 is attached to the front edge 23 of the turntable 1.
The swing bracket 35 is swingably supported on the support bracket 33 via the longitudinal axis 34, and the base of the boom 6 and the base of the boom cylinder 36 which moves the boom 6 up and down are fixed to the swing bracket 35. The pivot bracket 25 is formed by the support bracket 33, the longitudinal axis 34, the pivot bracket 35, and the like. The pivot bracket 25 is not only the support bracket 33 but also the pivot bracket 35 in FIG. Are also positions that do not protrude from the outer end 21 of the crawler traveling device 5.

Further, when the swivel base 1 is in a horizontal position,
The pivot 25 is also in a non-protruding state from the outer end 21 of the left and right crawler traveling device 5 to the left and right. The swivel table 1 has a rear edge 22 in an arc shape in a plan view, but has a substantially polygonal shape having side edges 20L and 20R substantially parallel to each other on the left and right and along the front-rear direction. Sometimes the pivot 25 is located inside the outer end 21 of the crawler traveling device 5. As a result, substantially the entire length of the turntable 1 from the pivotal support 25 to the arc-shaped rear edge 22 as well as the front edge 23 is substantially contained within the range between the outer ends 21 of the left and right crawler traveling devices 5. The traveling devices 5 can be both closer to the structure and the like, the workability in narrow places can be improved, the front-rear balance is good, and the stability can be good.

Looking at the relationship between the turntable 1 and the crawler traveling device 5 in the forward posture shown in FIG.
L and 20R are located inside the center of the width 27 of each of the right and left crawler traveling devices 5, and the left and right side edges 20
A space 26 is formed on the left and right crawler traveling device 5 between the L, 20R and the outer end 21 of the left and right crawler traveling device 5 so as to be open in the front-rear direction and upward. The engine 3 mounted on the swivel 1, the fuel tank 12, the hydraulic oil tank 13, and the like are surrounded by a cover 28. This cover 2
The left and right side surfaces and the rear surface of the turntable 8 are the left and right side edges 20 of the swivel 1.
And the rear edge portion 22 are substantially flush with each other and do not protrude from the swivel base 1, and form the space 26 together with the left and right side edge portions 20L and 20R of the swivel base 1 in the forward posture. ing.

The left and right spaces 26 are passable spaces, and communicate with a cover 28 and a step surface 29 formed on the upper surface of the swivel 1 in front of the cockpit 2 on the front side. The step surface 29 is formed on the front upper surface of the turntable 1 behind the boom 6 and in front of the cockpit 2, and communicates with the left and right sides of the turntable 1. Due to the presence of the left and right spaces 26, for example, when the worker walks between the crawler traveling device 5 and a structure or the like with the swivel 1 facing forward, the upper body of the worker becomes the side edges 20L, 20R. And the height of the side surface of the cover 28, the large space facilitates walking, and the operator may get off the step surface 29, pass outside of the swivel platform 1, and go behind the backhoe. It becomes possible and workability in a narrow place is improved.

Further, the fact that the side surface of the cover 28 is flush with the side edge portion 20 of the swivel base 1 means that when the swivel base 1 is in the forward posture, it is in a state along the front-rear direction, and is higher than the side edge portion 20. Due to this, the function of visually recognizing the turning posture of the turntable 1 can be exerted more than the side edge portion 20. The excavation work device A is provided such that the base of the boom 6 is swingable left and right through a pivotal support 25 at the left and right intermediate portion of the front of the swivel 1. However, the center of the cockpit 2 and the control lever group 31 in the left-right direction is shifted to the left with respect to the center of the swivel platform 1 in the left-right direction. 2 and the right side of the control lever group 31 are arranged close to each other in the left-right direction (non-overlapping state).

When the boom 6 is lifted from the state shown by the two-dot chain line in FIG. 2, the boom 6 moves to the upper side of the swivel base 1 and is inclined backward (the solid line state in FIG. 2). There is no interference with the group 31 and there is no problem in maneuvering to the side of the operator. Conversely, this makes it possible to arrange the control lever group 31 as close to the front of the swivel 1 as possible. As a result, the cockpit 2 can also be disposed at the front position as compared with the related art, and the front-rear length of the swivel base 1 can be reduced as much as possible.

[0025]

According to the present invention described in detail above, the cockpit 2
Further, since the control lever group 31 and the boom 6 that swings left and right are shifted in the left and right opposite directions with respect to the center of the swivel table 1 in the left and right direction, the working state is sufficiently visible, and The distance to both sides can be shortened to make it compact, and since the control lever group 31 is arranged in a non-overlapping state with the boom 6 in the left-right direction, the control lever group 31 can be extended to the front end of the swivel 1. Can be arranged close to each other, so that the whole can be configured compactly.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing a frontward posture of an embodiment of the present invention.

FIG. 2 is a cutaway side view of the same part.

FIG. 3 is a front view in a horizontal posture.

FIG. 4 is a sectional view of an arm.

FIG. 5 is a sectional view showing another embodiment of the arm.

FIG. 6 is a plan view showing a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 turning table 2 cockpit 3 engine 4 traveling machine stand 5 crawler traveling device 6 boom 9 radiator 12 fuel tank 13 hydraulic oil tank 20 side edge 21 outer end 22 rear edge 23 front edge 25 pivotal support 26 space 27 width 28 Cover 29 Step surface 31 Control lever group

Claims (5)

[Claims] 1. A swivel (1) having a cockpit (2) mounted on a traveling machine stand (4) having a left and right crawler traveling device (5) is rotatably provided, and a swivel (1) is provided in front of the swivel (1). In addition, a boom (6) of the excavating work device (A) is provided in front of the cockpit (2) so as to freely swing left and right, and a cockpit (2) and a control lever group (31) are provided in the left-right direction of the swivel table (1). ) And the boom (6) are arranged close to each other, and the center of the cockpit (2) and the control lever group (31) in the left and right direction is shifted to one of the left and right with respect to the center of the swivel table (1) in the left and right direction. A backhoe wherein 6) is shifted to the other side. 2. A swivel (1) having a cockpit (2) mounted on a traveling machine stand (4) having a left and right crawler traveling device (5) so as to be swivelable, and at a front part of the swivel (1). In addition, a boom (6) of the excavating work device (A) is provided in front of the cockpit (2) so as to freely swing left and right, and a cockpit (2) and a control lever group (31) are provided in the left-right direction of the swivel table (1). ) And the boom (6) are arranged close to each other, the center of the cockpit (2) and the control lever group (31) in the left and right direction is shifted to the left with respect to the center of the swivel table (1) in the left and right direction, and the boom (6) is shifted. ) Is shifted to the right, and the control lever group (31) and the boom (6) are arranged in a left-right non-overlap state. 3. A cover (28) for covering the engine (3) is mounted on the swivel base (1) so as not to protrude from the swivel base (1) in plan view, and is steered on the upper surface of the cover (28). The backhoe according to claim 1 or 2, wherein a seat (2) is arranged. 4. The backhoe according to claim 3, wherein a fuel tank (12) and a hydraulic oil tank (13) are separately arranged on both right and left sides in the cover (28). 5. A step surface (29) is formed on the front upper surface of the swivel (1) at the rear side of the boom (6) and in front of the cockpit (2) to communicate with the left and right sides of the swivel base (1). The backhoe according to any one of claims 1 to 4, wherein: