JPH08144316A - Hydraulic shovel - Google Patents

Abstract

PURPOSE: To increase controllability and workability in narrow field by arranging the rear end face part of a superstructure within approximately the same swing diameter as a vehicle width and also providing a stopper to restrict the maximum boom lifting angle. CONSTITUTION: The rear end face port of an upper superstructure 9 connected to the upper part of a carrier 7 is arranged approximately in the same swing diameter 2R as the vehicle width W with a swing bearing 8 taken as a center. Also an operator's seat 23a is arranged at the either position of the front center of the superstructure 7 or within the range between right and left side ends, and a stopper to restrict the boom 17 maximum lifting angle is installed at the front of the operator's set 23a. By this, it is avoided for the rear part of the superstructure 9 to come out of the range of vehicle width W in swinging, and such a trouble that soil and sand fall on the operator's seat 23a when the elevating angle of the boom 17 is increased can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a hydraulic excavator equipped with a lateral movement device for a work attachment.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of a hydraulic excavator described in Japanese Patent Publication No. 52-17644. In the figure, 1 is a moving device for a working machine section 2 provided at the front of the machine body of a hydraulic excavator, 3 is a fixed support machine frame provided at the front end of the machine body, 4 is a work frame supported by the fixed support machine frame 3. A mobile machine frame that supports the machine section 2, 5 is a hydraulic operating device for displacing the mobile machine frame 4 in the left-right direction, and 6 is a hydraulic pressure for turning the working machine section 2 in the left-right direction with respect to the mobile machine frame 4. It is an operating device. In the hydraulic excavator shown in FIG. 6, a work of supporting a hydraulic operating device provided between the movable machine frame and the fixed support frame to laterally move the movable machine frame on the fixed support frame and the movable machine frame so as to swing left and right. A moving device for the working machine section is provided by providing a retaining means provided between the movable machine frame and the fixed support frame for retaining the movable machine frame at a desired position between the fixed support frame and the movable machine frame. .

[0003]

Conventionally, in a hydraulic excavator equipped with a lateral movement device for a work attachment (the same as the working machine section described in the prior art), the rear part of the upper revolving structure is at the bottom when turning. The driver had to check the rear of the vehicle every time it made a turn, as it protruded outside the range of the vehicle width. Also, when the work attachment was displaced to the front side of the driver's seat to maximize the boom raising angle, the soil was spilled toward the driver's seat due to excessive boom raising, which was unsatisfactory. For hydraulic excavators that do not have swing brackets attached to the boom base end of the work attachment, displace the work attachment to the left or right end of the lateral movement device so that the center line of the work attachment and the driver's seat do not move. The distance was large and the excavation operation was difficult. Also, when the hydraulic excavator without the swing bracket attached to the upper swing body and the lower traveling body perform the excavation operation with the front-rear center lines in the same direction, the range outside the vehicle width range of the lower traveling body cannot be excavated. It was not convenient for the work. It is an object of the present invention to provide a hydraulic excavator structure that can solve the above problems.

[0004]

According to the present invention, in a hydraulic excavator in which an upper revolving structure is connected to an upper part of a lower traveling structure via a revolving bearing, a horizontal fixed support frame is fixed to a front part of the upper revolving structure. Then, the movable bracket frame is movably attached to the fixed support frame to form a lateral movement device, and the work attachment is attached to the movable bracket frame of the lateral movement device. The rear end face of the upper revolving structure is placed within a revolving diameter that is approximately the same as the vehicle width around the revolving bearing, and the driver's seat is located in the center of the front part of the upper revolving structure or at both left and right ends. It was placed at either position, and a stopper was installed in front of the driver's seat to regulate the maximum boom raising angle. Further, at least a part of the fixed support frame in the front part of the upper revolving structure is formed in a plane curved shape, and the movable bracket frame is displaced to the curved part, so that the work attachment is swing-set to the upper revolving structure. I did it.

[0005]

In the present invention, since the rear end face portion of the upper revolving structure on the rear side of the revolving center of the revolving bearing is arranged within the revolving diameter of the width of the vehicle about the revolving bearing, the upper revolving structure is revolved. Even if it is operated, the rear part does not extend beyond the vehicle width range of the undercarriage. In addition, the driver's seat is located at the center of the front part of the upper revolving structure or at any position on the left and right sides, and a stopper is provided in front of the driver's seat to restrict the maximum boom raising angle. It does not hinder the driver's side by raising it too high. At the same time, when the work attachment is displaced to a position other than the front of the driver's seat,
The boom can be raised to the maximum angle to minimize the turning radius of the work attachment. Further, since at least a part of the fixed support frame at the front part of the upper revolving structure is formed in a curved shape in a plan view, the work attachment is set to swing on the upper revolving structure by displacing the moving bracket frame in the curved part. be able to. As a result, the distance between the center line of the work attachment and the driver's seat can be reduced to facilitate the excavation operation, and the excavation operation can be performed with the upper and lower revolving units having the same center line in the front-rear direction. Even when performing, it is possible to excavate a range outside the vehicle width range of the undercarriage.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall side view of a hydraulic excavator according to a first embodiment of the present invention. In the figure, 7 is a lower traveling body of the hydraulic excavator, 8 is a slewing bearing, 9 is an upper slewing body, and 10a is a driver's seat (not shown in FIG. 1) and is provided in the upper slewing body 9. Cab, 11 is upper revolving structure 9
A fixed support frame fixed to the left and right at the front end of the
a is a stopper fixed to the fixed support frame 11,
3 is a moving bracket frame, 14 is a bracket part of the moving bracket frame 13, 15 is a guide sliding fitting part between the fixed support frame 11 and the moving bracket frame 13, and 16 is mounted on the bracket part 14 of the moving bracket frame 13. Working attachment, 17 is a boom of the working attachment 16, 18 is an arm, 19 is a bucket, 20 is a boom cylinder, 21
Is an arm cylinder, 22 is a bucket cylinder, and the angle θ is a horizontal plane H.H. L. Is the boom raising angle, the angle αmax. Is the maximum boom raising angle regulated by the stopper 12a, and 0-0 is the swing center of the swing bearing 8 and the upper swing body 9. FIG. 2 is a plan view of an essential part seen from AA in FIG. In the figure, 23a is a driver's seat arranged inside the cab 10a, 24L and 24R are left and right operation levers, 25 is a traveling operation lever, W is a vehicle width dimension of the lower traveling body 7, and R is an upper turning. This is the turning radius of the rear end surface of the body 9. In FIG. 3, the movable bracket frame 13 is displaced to a position other than the front of the driver's seat (in this embodiment, the cab 10a is provided, so the cab 10a is in front), and the boom 17 is maximally lifted and the arm 18 and the bucket 19 are retracted most. It is the whole side view when it is operated to. In the drawing, the angle θmax. Is the maximum boom raising angle when the moving bracket frame 13 is displaced to a position other than the front of the cab 10a and the boom 17 is maximally raised, and Smini is the minimum turning radius of the work attachment 16 at the front end side partial position a. Is.

Next, the construction and operation of the hydraulic excavator according to the first embodiment of the present invention will be described with reference to FIGS. In the present invention, the upper revolving structure 9 on the rear side from the revolving center 0-0 of the revolving bearing 8
The rear end surface portion (b) (shown in FIG. 2) is within a turning diameter (width of the turning diameter is 2R) having substantially the same width as the vehicle width (the width of the vehicle is W) about the turning bearing 8. Placed in. Therefore, even if the upper revolving superstructure 9 is turned, the rear portion thereof does not extend beyond the range within the vehicle width (vehicle width dimension is W) of the lower traveling body 7. Further, the cab 10a having the driver's seat 23a is arranged on either the left end side or the right end side of the front part of the upper swing body 9, for example, the left end side as shown in FIG. A stopper 12a for restricting the maximum boom raising angle is provided. As a result, when the boom 17 is lifted up to the angle dmax. As shown by the phantom line C in FIG. 1, the rear surface of the base of the boom 17 is stopped by the stopper 12a.
Since the boom 17 is abutted against the cab 10 to prevent the boom 17 from being raised too much, the boom 17 can be prevented from interfering with the cab 10a. Further, when the moving bracket frame 13 is displaced to a position other than the front of the cab 10a (the drive structure for performing this displacement is not shown) and the boom 17 is raised, the rear side of the base of the boom 17 contacts the stopper 12a. Therefore, as shown in FIG. 3, the boom 17 is raised to the maximum angle θmax. And the arm 18 and the bucket 19 are operated in the most retracted state to minimize the turning radius of the work attachment 16 at the front end side partial position a. It can be reduced to the turning radius Smini.) Shown in FIG.

Next, FIG. 4 is a plan view of the essential parts of a hydraulic excavator according to a second embodiment of the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those of the hydraulic excavator of the first embodiment. 26 is an upper revolving structure, 10b is a driver seat 2 inside
3b is a cab provided on the upper swing body 26. Next, the configuration and operation of the second embodiment hydraulic excavator of the present invention will be described with reference to FIG. The hydraulic excavator according to the second embodiment is different from the hydraulic excavator according to the first embodiment in that a cab 10b provided with a driver's seat 23b is arranged in the center of the front part of the upper swing body 26, and the cab 10b is provided in front of the cab 10b. The point is that the fixed support frame 11 is provided with a stopper 12b for restricting the maximum angle for raising the boom 17. The operation of the hydraulic shovel of the second embodiment is similar to that of the hydraulic shovel of the first embodiment.

Next, FIG. 5 is a plan view of essential parts of a hydraulic excavator according to a third embodiment of the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those of the hydraulic excavator of the first embodiment. 27 is an upper revolving structure, 10c is a driver's seat 2 inside
A cab provided on the upper revolving superstructure 27 in which 3c is disposed, and a fixed support frame 28 fixed to the front end of the upper revolving superstructure 27 in the left-right direction and partially curved and partially linear in plan view,
c is a stopper fixed to the fixed support frame 28, 2
9 is a moving bracket frame, 30 is a bracket portion of the moving bracket frame 29, U is a seat center portion of the driver's seat 23c, P-
P is the center line of the work attachment 16 in the front-rear direction, Q-Q
Assuming that the right end side of the fixed support frame 28 in plan view is on a straight line in the left-right direction, the work attachment 1 is attached to the right end side thereof.
The work attachment center line when the 6 is moved, the dimension L1 is the distance from the seat center portion U to the center line PP, and the dimension L2 is the distance from the seat center portion U to the center line Q-Q.

Next, the construction and operation of the hydraulic excavator according to the third embodiment of the present invention will be described with reference to FIG. The hydraulic excavator of the third embodiment differs from the hydraulic excavators of the first and second embodiments in that at least a part of the fixed support frame 28 at the front part of the upper swing body 27, for example, the right end side portion as shown in FIG. This is a point formed in a curved shape (curved shape such as an arc shape) in a plan view. As a result, the curved portion (the portion indicated by the reference numeral C shown in FIG. 5)
By displacing the moving bracket frame 29, the work attachment 16 can be set to swing with respect to the upper swing body 27. Therefore, the distance L1 between the center line P-P of the work attachment 16 and the seat center portion U of the driver's seat 23c can be made smaller (smaller than the distance L2 shown in FIG. 5) to facilitate the excavation operation. . At the same time, even when the excavation operation is performed with the center lines of the upper revolving structure 27 and the lower traveling structure 7 in the same direction, the range outside the vehicle width range (range of the dimension W) of the lower traveling structure 7 is excavated. be able to.

[0011]

Since the rear end surface of the upper revolving superstructure on the rear side of the revolving center of the present revolving bearing is arranged within the revolving diameter of the width around the revolving bearing, which is substantially the same as the vehicle width, the upper revolving superstructure is swung. Even if it is operated, the rear part does not extend beyond the vehicle width range of the undercarriage. Therefore, it is possible to reduce the nervous fatigue that the driver has to worry about the rear of the vehicle each time the vehicle turns. In addition, the driver's seat is located at the center of the front part of the upper revolving structure or at any position in the range to the left and right ends, and a stopper for restricting the maximum boom raising angle is provided on the front side of the driver's seat.
The boom will not be raised too much and will not affect the driver's side. At the same time, when the work attachment is displaced to a position other than the front of the driver's seat, the boom can be raised to the maximum angle to reduce the turning radius of the work attachment to the minimum. Therefore, it is possible to improve the operability and workability of the hydraulic shovel in a narrow field. Further, in another embodiment of the hydraulic excavator of the present invention, at least a part of the fixed support frame at the front part of the upper revolving structure is formed in a curved shape in a plan view. Therefore, by displacing the movable bracket frame in the curved portion, the upper revolving structure is rotated. You can swing the work attachment to the body. As a result, the distance between the center line of the work attachment and the driver's seat can be reduced to facilitate the excavation operation, and the excavation operation can be performed with the upper and lower revolving units having the same center line in the front-rear direction. Even when performing, it is possible to excavate a range outside the vehicle width range of the undercarriage. Therefore, in the present invention,
It is possible to improve the operability and workability of the hydraulic excavator in which the work attachment lateral movement device is provided on the front part of the upper swing body.

[Brief description of drawings]

FIG. 1 is an overall side view of a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is a plan view of an essential part seen from AA in FIG.

3 is an overall side view showing an operation example of the hydraulic shovel in FIG. 1. FIG.

FIG. 4 is a plan view of a main part of a hydraulic excavator according to a second embodiment of the present invention.

FIG. 5 is a plan view of an essential part of a hydraulic excavator according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a hydraulic excavator according to an embodiment of the related art.

[Explanation of symbols]

 1 moving device 7 lower traveling body 8 revolving bearing 9, 26, 27 upper revolving body 10a, 10b, 10c cab 11, 28 fixed support frame 12a, 12b, 12c stopper 13, 29 moving bracket frame 16 work attachment 17 boom 23a, 23b , 23c Driver's seat

Claims (3)

[Claims] 1. In a hydraulic excavator in which an upper revolving structure is connected to an upper part of a lower traveling structure via a revolving bearing, a horizontal fixed support frame is fixed to a front portion of the upper revolving structure, and the fixed support frame is fixed to the fixed support frame. The movable bracket frame is movably attached to form a lateral movement device, the work attachment is attached to the moving bracket frame of the lateral movement device, and the rear end face part of the upper revolving structure on the rear side of the revolving center of the revolving bearing is fixed. The slewing bearing is located within the slewing diameter that is approximately the same as the vehicle width, and the driver's seat is located on either the left end side or the right end side of the front part of the upper slewing body. A hydraulic excavator characterized in that a stopper for restricting the maximum boom raising angle is provided on the front side of the hydraulic excavator. 2. In a hydraulic excavator in which an upper revolving structure is connected to an upper part of a lower traveling structure via a revolving bearing, a fixed support frame in the left-right direction is fixed to a front part of the upper revolving structure, and the fixed support frame is fixed to the fixed support frame. The movable bracket frame is movably attached to form a lateral movement device, the work attachment is attached to the movable bracket frame of the lateral movement device, and the rear end surface part of the upper revolving structure on the rear side of the revolving center of the revolving bearing is attached. It is placed within a turning diameter of about the same width as the vehicle width around the slewing bearing, and the driver's seat is placed in the center of the front part of the upper swing structure or at a position deviated to the left or right from the center. , A hydraulic excavator characterized in that a stopper for restricting the maximum boom raising angle is provided on the front side in front of the driver's seat. 3. The hydraulic excavator according to claim 1 or 2, wherein at least a part of the fixed support frame at the front part of the upper swing body is formed in a curved shape in plan view, and the curved portion is formed. A hydraulic excavator characterized in that a work attachment is set to swing with respect to an upper revolving structure by displacing a moving bracket frame.