JPH07324353A - Upper revolving superstructure tilting mechanism for hydraulic excavator - Google Patents

Abstract

PURPOSE:To horizontally hold an upper revolving superstructure even when a lower traveling body is inclined in sympathy with the inclination of a road surface. CONSTITUTION:In a hydraulic shovel having a lower traveling body 1 and an upper revolving superstructure 2, an oscillating 5 supported by a pin 6 is formed between the center bridge frame 3 of the lower traveling body 1 and a rotating support table 4 provided on the bottom part of the upper revolving superstructure 2. Tilting cylinders 7A, 7B are arranged on the oscillating part 5, so that the upper revolving superstructure 2 can be tilted to the lower traveling body 1 by the expansion and contraction of the tilting cylinders 7A, 7B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator, and more particularly to an upper revolving structure tilting mechanism for keeping an upper revolving structure horizontal regardless of the inclination of a lower traveling structure.

[0002]

2. Description of the Related Art In conventional hydraulic excavators, a revolving superstructure is provided above a lower traveling body, and the revolving superstructure is generally configured to be parallel to the lower traveling body. Since it has a function of turning left and right at the upper part of the lower traveling structure, it is difficult to perform vertical excavation when the work road surface is tilted, stepped or stepped, and conversely on a horizontal road surface. However, there are problems such as inclined excavation (drilling at an angle) may be difficult.
Japanese Patent Publication No. 68 discloses a tilting mechanism for a revolving structure.

[0003]

[Problems to be Solved by the Invention]
In the 1968 publication that discloses a tilting mechanism for a revolving structure, since the tilting cylinders are arranged near the left and right track shoes, there is damage to the cylinders due to the entrainment of earth and sand during traveling, and the lower traveling The body itself also needed a major modification to the lower running body of the standard hydraulic excavator without the tilting mechanism.

The present invention can prevent damage to the tilting cylinder, and can be made with a small modification while maintaining the compatibility of the members with the lower traveling body of the standard hydraulic excavator without the tilting mechanism. The purpose of the present invention is to provide an upper swing body tilting mechanism of a hydraulic excavator that can be maintained.

[0005]

In order to achieve the above object, the first feature of the present invention is to provide a hydraulic excavator having an upper revolving structure on a lower traveling structure, and to provide a center bridge frame of the lower traveling structure and an upper revolving structure. A swinging portion is supported between the bottom portion and the bottom portion by a pin, and a tilting cylinder is disposed on the swinging portion, and both ends of the swinging portion are provided on either side of the center bridge frame of the lower traveling body. The lower support part of
It is arranged in parallel in an inverted octagonal shape by connecting it to either the upper support portion on either side of the turning support table.

A second feature is that, in the first configuration, the left and right lower support portions are provided at pair positions offset from each other with respect to the center of the center bridge frame.

A third feature is that, in the second structure, the lower support portion on the side of the center bridge frame is mounted in the center bridge frame, which is opened in the upper surface thereof.

[0008]

According to the above construction, first, the upper revolving structure is rocked with respect to the lower traveling structure by the expansion and contraction of the tilting cylinder to keep the upper revolving structure horizontal regardless of the posture of the lower traveling structure. By arranging a pair of tilting cylinders in parallel with each other so that the tilting cylinders are inclined in opposite directions, the space between the tilting cylinders and the conventional undercarriage is slightly increased, and the upper revolving structure is leveled. It is possible to keep Secondly, since the left and right lower support portions are provided at symmetrical positions offset from each other with respect to the center of the center bridge frame, the left and right lower support portions can be attached without interfering with each other. Thirdly, the lower support part is opened on the upper surface of the center bridge frame,
Since the tilting cylinder is installed in a slanted position, the height of the tilting cylinder can be kept low and the stroke of the tilting cylinder can be increased, and contact with earth and sand from the undercarriage of the undercarriage during work can be avoided. In addition, the member of the lower traveling body is not much different from the member of the standard hydraulic excavator having no tilting mechanism, and the cost increase can be avoided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. An upper revolving structure tilting mechanism of a hydraulic excavator according to the present invention is provided in a center bridge frame 3 of the lower traveling structure 1 and a bottom portion of the upper revolving structure 2 in a hydraulic excavator having a lower traveling structure 1 and an upper revolving structure 2. A swinging portion 5 supported by a pin 6 is provided between the swinging table 4 and the swinging table 4, and a tilting cylinder 7 is attached to the swinging portion 5.
The tilting cylinders 7A and 7A are provided by disposing A and 7B.
By expanding and contracting B, the upper revolving structure 2 can be tilted with respect to the lower traveling structure 1.

A swing circle 2a is provided in the lower part of the upper revolving structure 2 at the center of revolving, and the revolving table 4 is fixed to the lower surface of the swing circle 2a. Bracket-shaped support portions 4a, 4a that hang down at a predetermined interval are provided at the front and rear ends of the center.
Are provided respectively, and a pin hole for the pin 6 is provided in the lower part. Further, the center bridge frame 3 provided on the lower traveling body 1 is provided at the center of the vehicle so as to straddle the track frames 8 on both sides,
A pair of triangular support portions 3a, 3a having an appropriate space sandwiching the bracket 4a are provided upright in front of and behind the upper surface of the central portion so as to face each other. A pin hole for the pin 6 is provided in a portion close to the top of the supporting portion 3a, so that the supporting portion 4a of the turning table 4 and the center bridge frame 3 are provided.
The pin 6, into each pin hole between the pair of support portions 3a, 3a.
By inserting 6, the lower traveling body 1 and the upper revolving body 2
And are connected via the swinging part 5. In the figure, 9 is a crawler track, 1
0 is the lower wheel.

Further, the arrangement of the tilting cylinders 7A and 7B for swinging the swinging portion 5 is shown. It is constituted by a pair of left and right, and both ends thereof are provided in the center bridge frame 3 of the lower traveling body 1. Either of the front and rear lower support portions 3b, 3
c and one of the left and right upper support portions 4b and 4c are connected to each other to form an inverted octagonal arrangement.

In this case, the revolving table 4 is provided with yoke-shaped upper support portions 4b and 4c which are hung from the center O of the vehicle body in the left-right direction and at appropriate intervals in the front-rear direction, and the center bridge frame 3 side. The yoke-shaped lower support portions 3b and 3c provided on the upper surface of the center bridge frame 3 are opened to effectively use the limited space of the center bridge frame 3, and a table 11 protruding from the wall surface 3d is provided in the frame 3. , When mounted on the mounting surface of the base 11, the center bridge frame 3 is offset to a pair of positions a, a which are crossing the center (same as the center of the vehicle body) OO of the center bridge frame 3 (see FIGS. 2 and 4). ).

For example, as shown in FIGS. 1 and 2, in the tilting cylinders 7A arranged in parallel, the rod side is connected by the upper support portion 4b and the pin 12, and the bottom side is connected by the lower support portion 3b and the pin 13. ing. Similarly, in the tilting cylinder 7B, the rod side is connected by the upper support portion 4c and the pin 14, and the bottom side is connected by the lower support portion 3c and the pin 1.
They are connected by 5. As a result, the tilting cylinders 7A and 7B have an inverted eight shape with the lower ends intersecting when viewed from the front view of FIG. And in this case pin 1
The axes of 3 and 15 are separated left and right, and are arranged side by side in the front-rear direction. The lower support portions 3b and 3c are fixed to the base 11 with bolts 16 (see FIG. 3). Therefore, the tilting cylinders 7A, 7B
When any of the above is extended and the other is reduced, the upper swing body 2 tilts with respect to the lower traveling body 1. Further, in the center bridge frame, the diameter of the cylindrical wall surface 3d is the same as that of a standard hydraulic excavator frame without a tilting mechanism,
By accommodating the lower support portion of the tilting cylinder in the inside, the frame material 1 straddling the track frames 8 and 8 can be used in common, and can be configured only by adding the support member 3a and the base 11.

Next, the operation will be described. As shown in FIG. 4, when the upper swing body 2 is placed horizontally with respect to the lower traveling body 1, the tilting cylinders 7A and 7A of the swing unit 5 are
The B rod has the same length. When the undercarriage 1 is tilted due to the inclination of the ground, the rod of the tilting cylinder 7A is contracted in order to keep the upper revolving structure 2 horizontal.
When the rod of the tilting cylinder 7B is extended, the upper revolving structure 2 can be made horizontal even if the lower traveling structure 1 is inclined as shown in FIG. FIG. 1 shows a case where the left running body 1 leans up to a high place and leans, but when the right running body 1 leans up to a high place and leans, naturally, the reverse operation to the upper part The revolving structure 2 can be kept horizontal.

FIGS. 5 to 10 show various examples of work by application of the present invention. In each of the drawings, 1 on the upper swing body 2 is shown.
7 is a driver's cab, 18 is another structure, 19 is a working machine, 2
Reference numeral 0 is a bucket provided at the tip of the working machine. First, as shown in FIG. 5, since the upper revolving structure 2 is horizontal with respect to the lower traveling structure 1 on a sloping ground, the groove 21 extending perpendicularly to the ground is formed.
Can be drilled. Further, as shown in FIG. 6, in the case of excavation of a place where the ground is flat and gas pipes and water pipes are buried near the surface of the earth, the upper revolving structure 2 is reversed with respect to the horizontal lower traveling structure 1. By tilting, the groove 23 can be excavated without interfering with the gas pipe or the water pipe 22. Then, as shown in FIG. 7, in the case of burying a pipe on a road with a curb 24, excavation of the groove 23 can be performed in a direction perpendicular to the ground even if one side of the lower traveling body 1 rides on the curb 24. Further, as shown in FIG. 8, excavation of the groove 23 in a soft ground can hinder the excavation because the upper revolving structure 2 can maintain the horizontal state even if the ground contact surface of the lower traveling structure 1 may not be flat during the excavation work. Can be done without. FIG. 9 shows horizontal leveling excavation on an uneven ground, and in this case as well, the upper swing body 2 can be maintained in a horizontal state even when the ground is inclined, and the work can be performed without any problem. FIG. 10 shows the case of slope excavation using the triangular bucket 20a, but in this case as well, the upper revolving structure 2 can be made horizontal so that work can be performed without problems. For example, the present invention can effectively perform a work suitable for each environment.

[0016]

Since the present invention is constructed as described above, the upper revolving structure is swung with respect to the lower traveling structure by the expansion and contraction of the tilting cylinder, and the upper revolving structure is rotated regardless of the posture of the lower traveling structure. The body can be maintained in a horizontal posture, and the tilting of the pair of tilting cylinders in an inverted octagonal shape allows the limited space of the center bridge frame to be used effectively and the upper revolving structure to be horizontal. It is possible to keep The left and right lower support portions are provided at symmetrical positions offset from each other with respect to the center of the center bridge frame, so that they can be assembled and disassembled without mutual interference of pins or the like. Furthermore, by opening the lower support part on the upper surface of the center bridge frame and storing it in the center bridge frame, the mounting height of the tilting cylinder is kept low to make a stroke and the tilting cylinder is separated from the underbody part. Since it is provided at the position, it is possible to avoid contact with earth and sand from the undercarriage of the lower traveling body during work, and the tilt cylinder is not damaged. Further, with the above configuration, the center bridge frame can be made compatible with members of a standard hydraulic excavator having no tilting mechanism, so that the cost does not increase.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an inclined state of an upper swing body tilting mechanism of a hydraulic excavator according to the present invention.

FIG. 2 is a plan view of a tilting mechanism portion taken along the line XX in FIG.

3 is a side view of the tilting mechanism portion of FIG. 1. FIG.

FIG. 4 is a front view showing a horizontal state of the tilting mechanism portion of FIG. 1.

FIG. 5 is an explanatory diagram of a situation of trench excavation on a slope using the hydraulic excavator according to the present invention.

FIG. 6 is an explanatory view showing a state where the underground pipe using the hydraulic excavator according to the present invention is excavated to avoid excavation.

FIG. 7 is an explanatory diagram of a situation of excavating a groove on a road with a curb using the hydraulic excavator according to the present invention.

FIG. 8 is an explanatory diagram of a situation of trench excavation on a soft ground using the hydraulic excavator according to the present invention.

FIG. 9 is an explanatory diagram of a state of water averaging on rough terrain using the hydraulic excavator according to the present invention.

FIG. 10 is an explanatory diagram of slope work using a triangular bucket on a slope using the hydraulic excavator according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lower traveling body, 2 ... Upper swing body, 3 ... Center bridge frame, 3b, 3c ... Lower support part, 4 ... Swivel support table, 4b, 4c ... Upper support part, 5 ... Oscillating part, 6 ... Pin, 7
A, 7B ... Tilt cylinder, 11 ... Stand.

Claims (3)

[Claims] 1. A hydraulic excavator having a lower traveling structure and an upper revolving structure, wherein a swing is supported by a pin between a center bridge frame of the lower traveling structure and a revolving support table provided at the bottom of the upper revolving structure. And a pair of tilting cylinders are provided on the swinging part, and both ends thereof are a lower support part provided in the center bridge frame of the lower traveling body and an upper support part of the swing support table. The upper revolving structure tilting mechanism of the hydraulic excavator, which is connected in parallel with each other to form an inverted octagonal parallel arrangement. 2. The upper swing body tilting mechanism of the hydraulic excavator according to claim 1, wherein the left and right lower support portions are provided at symmetrical positions offset from each other with respect to the center of the center bridge frame. 3. The upper swing body tilting mechanism for a hydraulic excavator according to claim 2, wherein the lower support portion is mounted in the center bridge frame, the upper surface of which is opened.