JP2521010Y2 - Crawler interval variable work vehicle - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a crawler interval variable work vehicle capable of enlarging and reducing the interval between the left and right crawlers of a crawler type work vehicle such as a backhoe.

[Conventional technology]

Conventionally, with crawler traveling type work vehicles such as backhoes, the crawler interval is narrow, but the turning performance is poor due to the large number of small turns in poor ground.In recent years, the boom length has become longer and The amount of offset from the crawler to the excavation position during excavation has increased, and stability in the lateral direction of the fuselage has decreased.

As compared with the conventional work vehicle described above, it is desired to increase the crawler interval in order to expand work applications and improve the turning performance and stability of the work vehicle. On the other hand, it is often necessary to pass the work vehicle through the barriers and narrow areas, and there is an increasing demand for conflicting requests to reduce the distance between the left and right crawlers.

[Problems to be Solved by the Present Invention] The present invention has been made to solve the above-mentioned conflicting demands, and it is possible to ensure the turning performance and stability of a work vehicle, and The purpose is to provide a work vehicle with variable crawler spacing that can also pass through narrow areas.

[Means for solving the problem]

In order to achieve the above-mentioned object, the technical means adopted by the present invention is a box-shaped machine frame of a crawler type work vehicle, in which two front and rear tubular members are horizontally penetrated,
At both ends of the tubular member, rod-shaped members that penetrate through the traveling body frame and are attached toward the inside of each of the left and right traveling body frames are inserted, and the left and right traveling body frames are attached to the machine body frame reinforced by the tubular member. In addition to assembling, hydraulic cylinders are respectively installed between the left and right traveling body frames and the machine body frame, and the expansion and contraction control of the space between the left and right crawlers mounted on the traveling body frame and the machine body frame by the expansion and contraction control of the hydraulic cylinders. It is characterized by what has been made possible.

[Function of device]

Therefore, according to the present invention, when excavating in the lateral direction of the machine body with a large offset amount, the hydraulic cylinders interposed between the left and right traveling body frames and the machine body frame are extended to the left and right. The distance between the crawler and the machine body frame is widened, the stability of the machine body is ensured, the turning property is improved, and the small turning performance can be improved to improve the workability.

When passing through a barrier or narrow space, the hydraulic cylinders can be shortened to reduce the distance between the left and right crawlers and the aircraft frame, allowing a narrow barrier to pass. The two front and rear tubular members that support the left and right traveling body frames penetrate the box-shaped body frame horizontally in the vehicle width direction, so that the rigidity of the body frame is enhanced and the tubular member is also formed. Since the rod-shaped members that are attached through the traveling body frame are inserted at both ends of the, the force applied to the crawlers attached to the left and right traveling body frames is applied to the tubular members and does not directly affect the body frame, The frame is protected.

〔Example〕

The structure of the present invention will be described in detail below with reference to an embodiment shown in FIGS.

FIG. 1 is a partially cutaway plan view of a backhoe work vehicle to which the present invention is applied, with a vehicle body removed, FIG. 2 is a partially cutaway front view of the same state, and FIG. 3 is a machine body frame and a traveling body frame. FIG. 4 is an exploded perspective view showing an assembly structure of the vehicle, FIG. 4 is an exploded perspective view of a hydraulic control system for controlling a crawler interval, and FIG. 5 is an overall perspective view of a backhoe work vehicle.

In the figure, 1 is a crawler type backhoe work vehicle, 2
Is an upper revolving structure, 3 is a lower traveling structure, and an upper revolving structure 2
Is provided with a backhoe 4 on the front side, a driving operation section 5 on one side, and a driving section 6 accommodating an engine, a hydraulic pump, etc. on the other side.
Hydraulically driven turning device 8 mounted on the machine body frame 7
It is possible to turn 180 degrees to the left and right.

The machine body frame 7 is formed in a box shape as shown in FIG. 3, and the front and rear two tubular members 9 and 9 ′ which penetrate the machine body frame 7 horizontally in the vehicle width direction are provided with crawlers 10, 1
Two front and rear lower traveling bodies 3 consisting of left and right traveling body frames 11 and 11 'equipped with 0's are attached to the insides of the traveling body frames 11 and 11' through the traveling body frames 11 and 11 '. The rod-shaped bodies 12, 12, 12 ', 12' are inserted into the machine body frame 7 reinforced by the tubular members 9, 9 '. In addition, the aircraft frame 7 and the left and right traveling body frames 11, 1
Between the left and right crawlers 10, 10 ′ and hydraulic cylinders 13 and 13 ′ for spacing control for expanding and contracting the spacing between the left and right crawlers 10, 10 ′ and the machine frame 7, respectively, are provided in front of the lower traveling body 3. An earth-discharging plate 15 which is vertically controlled by a cylinder 14 is provided.

Reference numeral 16 denotes a rotary joint mounted at the center of rotation of the revolving device 8, and a hydraulic circuit for pressure oil generated in the driving part 6 on the upper revolving structure 2 side and a lower traveling that relatively revolves with respect to the upper revolving structure 2. Hydraulic motors 17 and 17 'for driving the crawlers 10 and 10' on the body 3 side, hydraulic cylinders 14 for controlling the soil plate 15
The right and left hydraulic cylinders 13 and 13 'for controlling the distance between the left and right crawlers 10 and 10' are connected to the hydraulic circuit through the rotary joint 16 without any trouble.

As for the expansion / contraction control of the space between the left and right crawlers 10, 10 'and the body frame 7, as shown in FIG. 4, the crawler space control lever 18 provided on the operation operating part 5 of the upper swing body 2 is used.
By shifting from the middle position N to the left crawler advance position LW or the left crawler retreat position LN, the left cylinder operation valve 21a of the control valve 21 is operated via the left crank 19 and the left rod 20 which are linked to the crawler interval control lever 18. Then, the left hydraulic cylinder 13 extends or contracts, and the left crawler 10 advances or retreats with respect to the machine body frame 7.

Also, if the crawler interval control lever 18 is shifted from the middle position N to the right crawler advance position RW or the right crawler retract position RN, the control valve is connected via the right crank 19 'and the right rod 20' which are interlocked with the crawler interval control lever 18. The right cylinder operation valve 21a 'of 21 operates to extend or shorten the right hydraulic cylinder 13', and the right crawler 10 'advances or retreats. Therefore, the space between the left and right crawlers 10 and 10 'and the machine body frame 7 can be arbitrarily expanded or reduced according to the working conditions.

When the space between the left and right crawlers 10, 10 'and the body frame 7 is expanded or contracted, in the swing-type backhoe work vehicle 1, the backhoe 4 is swung to the side of the crawler 10 or 10' on the side where the backhoe 4 advances or retreats. Then move forward or backward with the crawler 10 or 10 'on that side in a floating state, and when this is finished, crawler 10 or 1 on this side
Ground 0 ', then the other side crawler 10 or 10'
In the same way, the space between the left and right crawlers 10, 10 'and the machine body frame 7 is expanded and contracted to make contact with the ground by advancing and retreating. If there is no room to turn the backhoe 4 laterally, a jack or the like may be used to float the crawler on the side to be advanced or withdrawn. The present invention is not limited to the turning type backhoe work vehicle, but can be applied to general non-turning type crawler work vehicles.

[Effect of device]

In short, the present invention is to provide a box-shaped machine frame of a crawler-type work vehicle in which two front and rear tubular members are horizontally penetrated, and the left and right traveling body frames are provided at both ends of the tubular member. The rod-shaped member attached through the traveling body frame is inserted toward the inside of the vehicle body to assemble the left and right traveling body frames to the machine body frame reinforced by the tubular member, and the left and right traveling body frames and the machine body frame Since a hydraulic cylinder is installed between each of the two, and the distance between the left and right crawlers mounted on the traveling body frame and the machine frame can be controlled by expanding and contracting the hydraulic cylinder, the machine can be adjusted with a large offset amount. When excavating in the lateral direction, by extending the hydraulic cylinder interposed between each left and right traveling body frame and the body frame, Spreading the distance between the body frame, together with the stability of the aircraft is ensured, maneuverability is handed turning ability it becomes good, thereby improving the workability.

Further, when passing through a barrier or a narrow space, shortening the hydraulic cylinder reduces the distance between the left and right crawlers and the machine frame, so that it is possible to easily pass through a narrow barrier.

Since the two front and rear tubular members that support the left and right traveling body frames penetrate the box-shaped body frame horizontally in the vehicle width direction, the rigidity of the body frame can be enhanced and At both ends of the tubular member, rod-shaped members inserted through the traveling body frame are inserted, so the force applied to the crawlers mounted on the left and right traveling body frames is directly applied to the tubular member and directly affects the aircraft frame. Without doing so, the effects such as the protection of the body frame can be obtained.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partially cutaway plan view of a backhoe work vehicle to which the present invention is applied with a vehicle body removed, and FIG. 2 is a part of the same state. A cutaway plan view, FIG. 3 is an exploded perspective view showing an assembly of the machine body frame and the traveling body frame, FIG. 4 is an exploded perspective view of a hydraulic control system for controlling a crawler interval, and FIG. 5 is a backhoe work vehicle. It is the whole perspective view. In the figure, 1 ... Backhoe work vehicle, 7 ... Airframe frame, 9, 9 '... Cylindrical member, 10, 10' ... Crawler, 11, 11 '... Traveling body frame, 12, 12' ... Rod-shaped member, 13, 13 ′ ... A hydraulic cylinder for controlling the crawler spacing.

Claims (1)

(57) [Scope of utility model registration request] 1. A box-shaped machine frame of a crawler-type work vehicle having two front and rear tubular members penetrating horizontally in the vehicle width direction, and at both ends of the tubular member, inside of each of the left and right traveling body frames. Insert the rod-shaped member that penetrates the traveling body frame toward, and assemble the left and right traveling body frames to the machine body frame reinforced by the tubular member, and A crawler spacing variable work vehicle characterized in that a hydraulic cylinder is interposed between the hydraulic cylinders, and the distance between the left and right crawlers mounted on the traveling body frame and the machine frame can be controlled by expansion / contraction control of the hydraulic cylinders.