JPH0881975A - Work vehicle - Google Patents

Abstract

PURPOSE: To prevent the damage of a piping extending from a hydraulic motor while obviating the deterioration of front outward appearance and an increase in manufacturing cost. CONSTITUTION: Cylindrical left frames 9 and right frames 9 in the lateral internal directions connected to each track frame 8 of a pair of left and right crawler travel gears 1 respectively are fitted slidably to cylindrical bearing frames 7 mounted on a machine base 2 in the lateral direction, and a mutual space between the left and right crawler travel gears 1 is varied and adjusted freely. Hydraulic-motor driving operating sections for driving and operating hydraulic motors M for driving set up to the crawler travel gears 1 are fitted to a swivel base rotatably mounted on the machine base 2 centering around a vertical axial center X, and pipings H extended from the hydraulic motors M are inserted to the left frames 9 and the right frames 9, and communicated and connected with the hydraulic-motor driving operating sections through a rotary joint 16 disposed at the center of rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular machine in which a laterally inward tubular left frame and right tubular frame, which are separately connected to respective track frames of a pair of left and right crawler traveling devices, are provided on a machine base. A swivel base that is slidably fitted in the supporting frame in a horizontal direction to change and adjust the distance between the left and right crawler traveling devices, and that is swivelable on the machine base so as to be rotatable about the longitudinal axis. In addition, the present invention relates to a work vehicle provided with a hydraulic motor drive operation section for driving and operating a drive hydraulic motor provided in the crawler traveling device.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned work vehicle, the pipe extending from the hydraulic motor is exposed to the outside of the machine base between the hydraulic motor and a rotary joint arranged at the center of turning [for example, Japanese Patent Laid-Open No. 5- No. 331877].

[0003]

According to the above-mentioned conventional structure, the pipe extending from the hydraulic motor is exposed to the outside of the machine base between the hydraulic motor and the rotary joint provided at the turning center. , It was easy to get damaged by being caught or colliding with other objects while driving or working. It is conceivable to provide a cover for protecting the pipe on the machine base, but there is a problem that the number of parts increases and the appearance becomes poor and the manufacturing cost increases.

An object of the present invention is to provide a work vehicle capable of preventing damage to the pipe extending from the hydraulic motor while preventing the appearance of the product from increasing and the manufacturing cost from increasing.

[0005]

A characteristic configuration of the present invention is that a pipe extending from a hydraulic motor is inserted into a left frame or a right frame and communicated with the hydraulic motor drive operating portion via a rotary joint provided at a turning center. It is connected.

[0006]

The rotary joint is arranged at the center of rotation by inserting the pipe extending from the hydraulic motor into the cylindrical left frame or right frame which is horizontally connected to the track frames of the pair of left and right crawler traveling devices and is horizontally inwardly directed. Since it is connected to the hydraulic motor drive operation unit through the connection, the pipe can be protected by the left frame or the right frame.

Since the pipe is inserted into the existing left frame or right frame, the number of parts does not increase as in the case where a cover for protecting the pipe is provided on the machine base.

[0008]

Therefore, unlike the case where the cover for protecting the piping is provided on the machine base, the number of parts does not increase, and it is possible to prevent the appearance from being deteriorated and the manufacturing cost to be increased. Moreover, since the pipe can be protected by the left frame or the right frame, it is possible to provide a work vehicle capable of preventing the pipe from being damaged by colliding with another object during traveling or working. It was

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a backhoe as an example of a work vehicle. This backhoe is provided with a swivel base 3 on a machine base 2 supporting a pair of left and right crawler traveling devices 1 so that the swivel base 3 can swivel around a vertical axis X, and the swivel base 3 has a control section 4,
The drive unit 5, a backhoe device 6 capable of lateral swing, and the like are installed and configured.

As shown in FIG. 2, a support frame 7 made of a square pipe frame is provided on the machine base 2 so as to be connected in a pair in the front-rear direction with its longitudinal direction along the left-right direction.
On the other hand, the track frame 8 of the left crawler traveling device 1
In this case, square pipes are projectingly provided at two positions in the front and rear of the track frame 8 toward the inside of the fuselage to form a left frame 9. The tip ends of the square pipes are fitted to the support frame 7 and slidably supported with the support frame 7 in the lateral direction. Right crawler traveling device 1
Also in the track frames 8 of the above, square pipes are projected toward the inside of the machine body at two front and rear positions of the track frames 8 to form right frames 9, respectively, and the tip portions of these square pipes are connected to the support frame. It is fitted to the support frame 7 and is supported slidably in the lateral direction with the support frame 7.

A double-acting first hydraulic cylinder 1 for changing and adjusting the distance between the left and right crawler traveling devices 1.
0 and the second hydraulic cylinder 12 between the front and rear support frames 7
The left and right crawler traveling devices 1 along the lateral direction between
The left and right crawler traveling devices 1 are independently movable laterally with respect to the machine base 2. Both ends of the first and second hydraulic cylinders 10 and 12 are pivotally connected to the track frame 8 and the machine base 2, respectively.

As shown in FIG. 4, in the swivel base 3, when the left and right crawler traveling devices 1 are closest to the vertical axis X, the turning locus S of the outer peripheral surface of the swivel base 3 is left and right. The crawler traveling device 1 is configured so as to be substantially in contact with the left and right outer ends of the crawler traveling device 1 so that the crawler traveling device 1 can be surely excavated to the end of the wall.

As shown in FIG. 3, a pair of pressure oil supply / discharge passages 1 for each of the first and second hydraulic cylinders 10, 12 is provided.
3, 14 from the hydraulic pump of the prime mover of the swivel 3 to the machine base 2
To the swivel base 3 side through a rotary joint 16 for supplying / discharging pressure oil to / from the first and second hydraulic cylinders 10, 1.
The valve 2 is connected to an operation valve 23 for expanding and contracting. One pressure oil supply / discharge passage 13 of the first hydraulic cylinder 10 and one pressure oil supply / discharge passage 14 of the second hydraulic cylinder 12 are connected to communicate with each other below the rotary joint 16 so that
It is made to enter the rotary joint 16 in the state of the oil passage of a book. The other pressure oil supply / discharge passage 1 of the first hydraulic cylinder 10
3 and the other pressure oil supply / discharge passage 14 of the second hydraulic cylinder 12, a switching valve 22 is provided between the operation valve 23 and the rotary joint 16 so that the oil from the pump is supplied to both oil passages. By selectively supplying and discharging, the number of pipes for the rotary joint 16 of the pipe system to the first and second hydraulic cylinders 10 and 12 can be reduced to three, thereby suppressing the enlargement of the rotary joint 16. I am doing it.

The operation valve 23 is a three-position switching type,
An operating lever 24 is provided for the operating valve 23. Although not shown, the rotary joint 16 is connected to an oil hydraulic motor for driving the left and right crawler traveling devices 1 and an oil hydraulic motor drive operation unit 26 (see FIG. 1) on the swivel 3 for communication. The road is equipped.

According to the above construction, since the left and right crawler traveling devices 1 can be independently laterally moved with respect to the machine base 2, as shown in FIG. When excavating the soil near the side wall, only the crawler traveling device 1 on the wall W side is moved to the vertical axis X side without moving the crawler traveling device 1 on the side opposite to the wall W to the vertical axis X side. By exchanging the former, the excavation work can be performed with the former being further away from the vertical axis than the latter. in this case,
In a state where the left and right crawler traveling devices 1 are closest to the vertical axis X, the rotation loci of the outer peripheral surface of the swivel base 3 are configured to be substantially in contact with the left and right outer ends of the left and right crawler traveling devices 1. From (see FIG. 4), it is possible to surely excavate up to the end of the wall.

Further, since it is possible to excavate the edge of the wall with the distance between the left and right crawler traveling devices 1 made wider than before, the truck 25 parked on the side opposite to the wall W.
Even when the swivel base 3 is swung to load soil onto the backhoe device 6 and the backhoe device 6 is turned sideways, the balance of the machine body can be stabilized.

As shown in FIG. 2, a pair of pipes H extending from a hydraulic motor M provided in the left and right crawler traveling devices 1.
Is an opening 2 formed at the base end of the left and right frames 9.
1 through the left and right frames 9 and taken out from the free end openings of the left and right frames 9 and communicated and connected to the hydraulic motor drive operating section 26 of the control section 4 via the rotary joint 16 arranged at the center of rotation. There is. The hydraulic motor drive operation unit 26 is configured by providing an operation lever on an operation valve (not shown) for driving and rotating the hydraulic motor M. The pipe H has slack so that the tensile force due to the lateral movement of the left and right frames 9 with respect to the support frame 7 does not become large.

As described above, the pipe H is connected to the left and right frames 9
Since it is inserted into the
Can be protected, and the pipe H can be prevented from being damaged by being caught or colliding with another object during traveling or working.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

FIG. 1 is an overall side view showing a backhoe.

FIG. 2 is a partially cutaway plan view showing a crawler traveling device and its support structure.

FIG. 3 is a circuit diagram showing a hydraulic circuit in a traveling section of the backhoe.

FIG. 4 is an overall plan view of the backhoe with the widths of the left and right crawler traveling devices reduced.

FIG. 5 is an overall plan view of the backhoe in which only one of the crawler traveling devices is on the center side of the machine body.

[Explanation of symbols]

 1 Crawler traveling device 2 Machine base 3 Revolving base 7 Support frame 8 Track frame 9 Left and right frames 16 Rotary joint 26 Hydraulic motor drive unit M Hydraulic motor X Vertical axis

Claims (1)

[Claims] 1. A cylindrical left frame (9) and a right frame (9), which are respectively connected to the track frames (8) of the pair of left and right crawler traveling devices (1) and are horizontally inwardly directed.
And slidably fitted in a tubular support frame (7) provided on the machine base (2) in the lateral direction so that the distance between the left and right crawler traveling devices (1) can be changed and adjusted. Then, a driving hydraulic motor (M) provided in the crawler traveling device (1) is driven and operated on a swivel base (3) provided on the machine base (2) so as to be able to swivel about a vertical axis (X). A working vehicle provided with a hydraulic motor drive operation section (26) for operating a pipe (H) extending from the hydraulic motor (M), which is inserted into the left frame (9) or the right frame (9). A work vehicle which is communicatively connected to the hydraulic motor drive operation unit (26) through a rotary joint (16) arranged at the turning center.