JPH07189283A - Hydraulic shovel - Google Patents

Abstract

PURPOSE:To make it possible to enhance safety by providing an excellent front visual field to workers when running and minimize a rotary radius, thereby enabling a hydraulic shovel to run in an alley or the like and hence widen a service area. CONSTITUTION:A boom 24 comprises a first boom 25 which is mounted to a turning frame 5 by way of each support bracket 21 and a second boom 26 installed to the tip of the first boom 25 so that it may turn freely by way of a turning device 27. It is, therefore, possible to house the second boom 26, an arm 33 and a bucket 34 or the like behind an operation chamber 6 by turning the second boom 26 with the first boom 25 by way of the turning device 27 and provide a favorable front visual field to a worker in the operation chamber 6 and minimize the rotary radius when turning to the left side and advance in a small area, such as an alley.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled hydraulic excavator preferably used as, for example, a wheel type hydraulic excavator or a crawler type hydraulic excavator.

[0002]

2. Description of the Related Art A wheel type hydraulic excavator will be described as an example of a conventional hydraulic excavator with reference to FIGS. 9 and 10. FIG.

In the drawing, reference numeral 1 denotes a lower traveling body of a wheel type hydraulic excavator, and the lower traveling body 1 is a chassis 2
And wheels 3, 3 (only two are shown) provided on the front, rear, left, and right of the chassis 2 and driven to rotate by a traveling hydraulic motor (not shown) or the like.

Reference numeral 4 denotes an upper revolving structure mounted on the lower traveling structure 1 so as to be revolvable. The upper revolving structure 4 is disposed on a revolving frame 5 and on the left front side of the revolving frame 5. A driver's seat 6A having a driver's seat 6A, levers and pedals (none of which are shown), and the like, a driver's cab 6 provided behind the driver's cab 6 on the revolving frame 5, and an engine and a hydraulic pump (not shown). A machine room 7 that accommodates (not shown),
The counterweight 8 is generally configured by a counterweight 8 provided at the rear end of the revolving frame 5.

Reference numeral 9 denotes a working device provided at the front part of the upper swing body 4, and the working device 9 is a substantially V-shaped boom 10 provided at the front part of the swivel frame 5 so as to be able to move up and down. An arm 11 provided on the tip end side of the boom 10 so as to be able to move downward
And a bucket 12 rotatably provided on the tip side of the arm 11, the boom 10, the arm 11, and the bucket 12 are rotatably operated by a boom cylinder 13, an arm cylinder 14, and a bucket cylinder 15, respectively. It has become so.

The wheel type hydraulic excavator according to the prior art has the structure as described above, and the operator operates the cab 6
By seating on the driver's seat 6A inside and operating levers, pedals, etc. in the driver's cab 6, the undercarriage 1 is caused to travel by each wheel 3 and earth and sand etc. are excavated by the working device 9.

On the other hand, when the wheel type hydraulic excavator is to be run on the road or the like, as shown in FIG. 1, the boom 10, the arm 11 and the bucket 12 of the working device 9 are folded and the bucket 12 of the chassis 2 is moved. It is placed on the front part and runs on the road in this state.

[0008]

By the way, in the wheel type hydraulic excavator according to the above-mentioned prior art, when traveling on a road or the like, the boom 10 is tilted forward and the arms 11,
Since the bucket 12 is run in such a position as to be pulled toward you, as shown in FIG. 10, in the visual field of the operator seated in the driver's seat 6A of the operator's cab 6, the position indicated by the diagonal line to the right front is The boom 10, the arm 11 and the like cause a blind spot. As a result, there is a problem that not only the safety at the time of traveling is greatly lowered, but also the safety at the time of traveling, especially at the time of making a right turn, needs to be carefully checked, which increases mental fatigue of the worker.

Further, since the boom 10 is tilted forward, the boom 10 largely protrudes forward from the lower traveling body 1 and the turning radius at the time of turning right or left becomes large. As a result, there is a problem that it becomes difficult to enter a work site such as an alley, and the use range is significantly narrowed.

On the other hand, in order to widen the front field of view, the boom 10 may be raised in order to reduce the turning radius and the vehicle may travel in this state. In this case, the center of gravity of the entire hydraulic excavator becomes high. As a result, driving stability will be significantly reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a good forward field of view to a worker at the time of traveling to enhance safety, and also enables traveling on an alley or the like by reducing a turning radius. The purpose of the present invention is to provide a hydraulic excavator capable of expanding the range of use.

[0012]

In order to solve the above-mentioned problems, a hydraulic excavator adopted by the present invention comprises a lower traveling body and an upper revolving superstructure located on the lower traveling body and having a cab. A boom that is located on the side of the operator's cab and that is provided in the front part of the upper revolving structure, and that the working device is mounted on the upper revolving structure so that it can be lifted and lowered; and a tip of the boom. It is composed of an arm attached to the side of the arm so that it can be moved up and down, and a bucket rotatably attached to the tip end side of the arm.

The features of the configuration adopted by the present invention are as follows:
The boom includes a first boom whose base end side is attached to the upper swing body, and a second boom which is attached to the tip end side of the first boom so as to be turnable via a turning device. This is because the second boom, the arm, and the bucket are arranged behind the operator's cab by turning the second boom about 180 degrees with respect to the boom.

[0014]

The second boom, the arm and the bucket are arranged in the cab by rotating the second boom about 180 degrees with respect to the first boom and arranging the second boom, the arm and the bucket behind the cab. In addition to providing a good front view to the operator in the cab by preventing it from protruding forward,
The amount of protrusion of the working device from the undercarriage can be reduced to reduce the turning radius.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

First, FIGS. 1 to 6 show a first embodiment of the present invention. In the embodiment, the same components as those of the prior art shown in FIGS. 9 and 10 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numerals 21 and 21 denote a pair of working device support brackets provided on the front side of the revolving frame 5 located on the side of the operator's cab 6, and each of the support brackets 21.
As shown in FIG. 2, the upper end side of the boom 24
A mounting hole 21A for mounting the first boom 25 is formed, and a support hole 21C for supporting the boom cylinder 35 is formed on the tip end side of the protruding portion 21B protruding forward from the revolving frame 5.

Reference numeral 22 denotes a housing recess formed by recessing the upper surface side of the machine room 7. The housing recess 22 is an arm cylinder 36 described later when the working device 23 is stored.
An accommodation space for accommodating the tip end side of the rod 36A and the like.

Reference numeral 23 denotes a working device according to the present embodiment provided in the front part of the revolving frame 5. The working device 23 is a boom 24, an arm 33, a bucket 34, a boom cylinder 35, an arm cylinder 36, and a bucket which will be described later. The cylinder 37 and the like are roughly formed.

Reference numeral 24 denotes a boom according to the present embodiment, which is used in place of the boom 10 according to the prior art.
Is roughly composed of a first boom 25, a second boom 26, a turning device 27, and the like, which will be described later.

Numeral 25 is a first boom on the base end side, which is the first boom.
The boom 25 is pin-coupled at the base end side to the mounting holes 21A of each support bracket 21 so as to be able to move up and down, and the tip end side extends with a predetermined curvature. Further, an extension portion 25A that extends so as to project downward in FIG. 2 is integrally provided on the base end side of the first boom 25, and the rod of the boom cylinder 35 is provided at the tip of the extension portion 25A. The tip of 35A is fixed. Further, as shown in FIG. 3, a turning device mounting plate 25B is provided on the tip end side of the first boom 25, and the outer ring 28 of the turning device 27 and the turning motor 3 are mounted on the mounting plate 25B.
2 is attached.

Numeral 26 is a turning device 27 on the tip side of the first boom.
A second boom pivotably mounted via
A swivel mounting plate 26A to which swivel wheels 30 of a swivel device 27 are mounted is provided on the proximal end side of the boom 26, and an arm 33 is mounted on the distal end side so that the arm 33 can be raised and lowered.

Reference numeral 27 denotes a turning device provided between the first boom 25 and the second boom 26, and the turning device 27 is
The outer ring 28, the slewing wheel 30, the slewing motor 32, etc. are generally configured.

Reference numeral 28 denotes an outer ring fixed to the mounting plate 25B of the first boom 25 via a plurality of bolts 29, 29, and 30 turns on the inner peripheral side of the outer ring 28 via a plurality of rolling elements 31, 31. Revolving wheels as inner wheels, which are movably provided and fixed to the mounting plate 26A of the second boom 26 via the respective bolts 29, are shown. The inner gear 30A is provided on the inner peripheral side of the revolving wheel 30.
Are formed.

Reference numeral 32 denotes a swing motor mounted on the lower surface side of the mounting plate 25B of the first boom 25.
Is a reduction gear 32A fixed to the mounting plate 25B, and an internal gear 30A of the slewing wheel 30 attached to the reduction gear 32A.
And a hydraulic motor 32C that is attached to the speed reducer 32A and that rotates the pinion 32B via the speed reducer 32A.

The turning device 27 constructed as described above supplies pressure oil to the hydraulic motor 32C of the turning motor 32 to rotate the pinion 32B, whereby the outer ring 2 is rotated.
The turning wheel 30 is turned inside the vehicle 8, and the second boom 26 is turned with respect to the first boom 25.

Reference numeral 33 denotes an arm attached to the tip side of the second boom 26 so as to be able to move upward and downward, 34 denotes a bucket rotatably attached to the tip side of the arm 33, and the arm 33 and the bucket 34 are The arm 11 and the bucket 12 described in the related art are configured in the same manner.

Reference numeral 35 denotes a boom cylinder according to the present embodiment, which is arranged between the support brackets 21. The boom cylinder 35 is provided at a base end thereof so as to provide a good side view to an operator in the cab 6. Side is the support hole 2 of each support bracket 21
1C is pin-coupled, and the tip of the rod 35A is the first boom 2
5 is pin-connected to the tip of the extended portion 25A. And
The boom cylinder 35 extends and contracts a rod 35A of the boom cylinder 35 to raise and lower the boom 24 via the extending portion 25A.

Further, 36 is an arm cylinder in which the base end side is attached to the second boom and the tip end of the rod 36A is attached to the arm 33. 37 is the base end side is attached to the arm 33 and 37 is attached to the bucket 34. Each bucket cylinder is shown.

The wheel type hydraulic excavator according to this embodiment has the above-mentioned structure.
A description will be given of the assembling operation for enabling the use of.

First, from the retracted state of the working device 23 shown in FIG. 1, the rod 35A of the boom cylinder 35 is extended to tilt the first boom 25 forward as shown in FIG. Then, in this state, the turning device 27 causes the second boom 26 to
By turning the boom 24, as shown in FIG.
The excavation work is carried out with a substantially V-shaped work state. Also,
At this time, the first boom 25 and the second boom 26 are automatically or manually fixed in this working state.

The wheel type hydraulic excavator thus assembled has a basic operation for excavating work, etc., except that the first boom 25 and the second boom 26 are integrated. There is no particular difference with.

In this embodiment, however, the boom 24 can be swung by the first boom 25 attached to the swivel frame 5 via the support brackets 21 and the swivel device 27 at the tip of the first boom 25. Second boom 26 provided in
And the second boom 26 is connected to the first boom 25.
Since the second boom 26, the arm 33, the bucket 34, and the like can be stored in the rear of the operator's cab 6 when the vehicle is running, the second boom 26, the arm 34, and the like can be stowed with respect to each other, as shown in FIG.
It is possible to provide a worker who is seated in the driver's seat 6A in the operator's cab 6 with a good front view without a blind spot over a wide range.
It is possible to greatly improve the safety while driving,
The turning radius when turning right or left can be reduced, allowing entry into narrow spaces such as alleys and greatly expanding the range of use.

Further, by turning the second boom 26 and bending the boom 24 in the direction opposite to the working state, it is possible to prevent the center of gravity of the hydraulic excavator from becoming high, and the stability during traveling is improved. It is possible to suppress the decrease.

Further, the support holes 2 of each support bracket 21
Since the boom cylinder 35 is provided between 1C and the extending portion 25A projecting downward on the base end side of the first boom 25, the blind zone due to the boom cylinder 35 is eliminated and the inside of the operator cab 6 is removed. It is possible to provide the operator with a good lateral view, further improve the safety at the time of right turn, and reduce the mental fatigue of the operator.

Next, FIGS. 7 and 8 show a second embodiment of the present invention. In addition, in the embodiment, the above-described FIGS.
The same components as those of the first embodiment shown in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 41 denotes a pair of working device support brackets (only one of which is shown) according to the present embodiment, which are provided on the front side of the revolving frame 5 and located on the side of the cab 6. Each of the support brackets is shown. 41 is formed in a trapezoidal shape, an attachment hole 41A for attaching a first boom 42 described later is formed on the upper side, and a support hole 41B for supporting a boom cylinder 43 described later is formed on the lower side.

Reference numeral 42 denotes a first boom according to the present embodiment in which the base end side is pin-coupled to the mounting holes 41A of each support bracket 41 so as to be able to move up and down, and the tip end side is extended with a predetermined curvature. As with the first boom 25 described in the first embodiment, a swivel device mounting plate (not shown) to which the swivel device 27 is mounted is provided on the side. However, the first boom 42 is different from the first boom 2 according to the first embodiment in that the extension portion 25A is not provided.
It is different from 5.

A pair of boom cylinders 43 according to the present embodiment in which the base end side is pin-connected to the support hole 41B of each support bracket 41, and the tip end of the rod 43A is pin-connected to the side surface on the front end side of the first boom 42 (only one is shown in the figure). ), Each of the boom cylinders 43 raises and lowers the boom 24 by extending and retracting its rod 43A.

Thus, also in this embodiment having such a configuration, the second boom 26, the arm 33, the bucket 34, etc. can be stored in the rear of the operator's cab 6, and the first boom 42 can be stored in the first boom 42. By turning the two booms 26, the working state shown in FIG. 8 can be obtained, and the same operational effect as that of the first embodiment can be obtained.

In each of the above embodiments, the wheel type hydraulic excavator has been described as an example of the hydraulic excavator.
Even if it is applied to a crawler type hydraulic excavator, the same effect can be obtained.

[0042]

As described in detail above, according to the present invention, a boom is provided with a first boom whose base end side is attached to an upper swing body so that the boom can be lifted, and a swing device on the tip end side of the first boom. And a second boom that is pivotally mounted via
Since the second boom, the arm, the bucket, and the like are arranged behind the driver's cab by turning the second boom about 180 degrees with respect to the first boom, the second boom, the arm, and the bucket are arranged. Etc. can be prevented from protruding to the front of the driver's cab, providing a good front view to the operator in the driver's cab, improving the safety during traveling, and the amount of protrusion of the working device from the lower traveling body. Can be made smaller to reduce the radius of gyration, and it is possible to travel in a narrow place such as an alley and widen the range of use.

[Brief description of drawings]

FIG. 1 is an overall view showing a wheel type hydraulic excavator according to a first embodiment of the present invention in a retracted state (running state) of a working device.

FIG. 2 is an enlarged view of essential parts showing a work device support bracket, a first boom, a boom cylinder and the like in FIG.

FIG. 3 is an enlarged vertical cross-sectional view showing a turning device in FIG.

FIG. 4 is an overall view of the wheel-type hydraulic excavator in which the working device is tilted forward from the stored state.

FIG. 5 is an overall view of the wheel hydraulic excavator showing a state in which excavation work is performed with the work device being in a working state by rotating the second boom.

FIG. 6 is an overall view of a wheel hydraulic excavator showing a front view of an operator in a cab from above.

FIG. 7 is an overall view of the same position as FIG. 1 showing a wheel type hydraulic excavator according to a second embodiment of the present invention in a stored state (running state) of a working device.

FIG. 8 is an overall view of the wheel hydraulic excavator at the same position as in FIG. 5, showing a state where excavation work is performed with the work device being in a working state by turning the second boom.

FIG. 9 is an overall view showing a wheel hydraulic excavator according to a conventional technique in a retracted state (running state) of a working device.

FIG. 10 is an overall view of a wheel hydraulic excavator showing a front view and a blind spot of an operator in a driver's cab from above.

[Explanation of symbols]

 1 Lower Traveling Body 4 Upper Revolving Body 6 Driver's Cab 23 Working Device 24 Boom 25, 42 First Boom 26 Second Boom 27 Revolving Device 33 Arm 34 Bucket

Claims (1)

[Claims] 1. An undercarriage, an upper revolving superstructure located above the lower traveling car and having a driver's cab, and a work provided laterally of the operator's cab in front of the upper revolving superstructure. And a boom attached to an upper revolving structure so as to be able to lift and lower, an arm attached to the tip side of the boom so as to be able to lift and lower, and a pivotal movement to the tip side of the arm. In a hydraulic excavator including a bucket attached to the boom, the boom has a first boom whose base end side is attached to the upper revolving superstructure and a tip end side of the first boom that can be turned via a turning device. A second boom attached to the first boom, and by pivoting the second boom about 180 degrees with respect to the first boom, the second boom, the arm, and the bucket are arranged behind the operator's cab. Hydraulic excavator characterized by .