JPH08296251A - Working vehicle with dozer - Google Patents

Abstract

PURPOSE: To prevent a small stone from being caught between an auxiliary dozer and a main dozer when the auxiliary dozer is contracted while backing a machine body in a working vehicle with dozer in which a lateral pair of crawler traveling devices are constituted in such a manner that the space between them is adjustable within a fixed range, a dozer device arranged in front of the crawler traveling devices is formed of the main dozer and the auxiliary dozers fitted and installed to its lateral outer end parts in such a manner as to be expansible and contractible, and the auxiliary dozers are driven by hydraulic cylinders, respectively. CONSTITUTION: The lateral outer end position of a main dozer 18 is set so that the lateral outer ends 18a of the main dozer 18 are always situated within the lateral width of each crawler traveling device 1. The expanding and contracting stroke L1 of an auxiliary dozer 19 is set to the same as the lateral movement regulating stroke L2 in the crawler traveling device 1 so that the lateral outer end position of the auxiliary dozer 19 can be conformed to the lateral outer end position of the crawler traveling device 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle with a dozer in which a pair of right and left crawler traveling devices are equipped with a dozer device at the front thereof. Regarding a work vehicle with a dozer for changing the width.

[0002]

2. Description of the Related Art A conventional work vehicle with a dozer is constructed such that the distance between a pair of left and right crawler traveling devices can be adjusted within a certain range, and a dozer device arranged in front of the crawler traveling device is a main dozer and a main dozer. The auxiliary dozer is fitted to the left and right lateral outer ends in a stretchable manner, and the auxiliary dozer is configured to be expanded and contracted by hydraulic cylinders.

[0003]

Conventionally, when the crawler traveling device is moved by a maximum stroke toward the lateral outer side of the vehicle body, the lateral inner end of the crawler traveling device is located more outward of the vehicle body than the lateral outer end of the main dozer. Therefore, when the auxiliary dozer is contracted while backing up the aircraft, pebbles located between the lateral inner end of the crawler traveling device and the lateral outer end of the main dozer are caught between the auxiliary dozer and the main dozer. The auxiliary dozer may not be able to contract, and in order to avoid this, it is necessary to frequently look into the back surface of the dozer device from the control section to operate the aircraft, which imposes a heavy burden on the operation.

An object of the present invention is to prevent pebbles from being trapped between the main dozer and the auxiliary dozer during back running of the airframe without the burden of maneuvering.

[0005]

According to the present invention as set forth in claim 1, the lateral outer end of the main dozer is always positioned within the lateral width of each crawler traveling device in the entire lateral movement adjusting stroke of each crawler traveling device. So that the lateral outer end position of the main dozer is set and the lateral outer end position of the auxiliary dozer can be matched with the lateral outer end position of the crawler traveling device. It is set the same as the lateral movement adjustment stroke.

According to the second aspect of the present invention, a protective cover for preventing foreign matter from entering the telescopic fitting portion between the main dozer and each auxiliary dozer is attached to each auxiliary dozer back part.

[0007]

According to the first aspect of the present invention, even when the crawler traveling device is moved to the outermost lateral side of the machine body by the maximum stroke, the lateral outer end of the main dozer is more than the lateral inner end of the crawler traveling device. Since it is located on the lateral outer side, there is no gap formed between the inner end of the crawler traveling device and the lateral outer end of the main dozer, and when the auxiliary dozer is contracted by backing the machine body, It is possible to prevent foreign matter such as pebbles from being caught between the main dozer and the auxiliary dozer.
In such a case, the pebbles on the passage that the crawler traveling device passes through will be crushed by the crawler traveling device.

According to the second aspect of the present invention, foreign matter such as pebbles reaching the back surface of the auxiliary dozer without being crushed by the crawler traveling device when the machine body is backed is protected by the protective cover for preventing the foreign matter from entering the main dozer. Is prevented from entering between the auxiliary dozer.

[0009]

According to the first aspect of the present invention, it is possible to prevent foreign matter such as pebbles from being trapped between the main dozer and the auxiliary dozer when the auxiliary dozer is contracted by backing the machine body. It is possible to do, and there is no burden on the operation.

According to the second aspect of the present invention, foreign matter such as pebbles that has not been crushed by the crawler traveling device and has reached the front is not caught between the main dozer and the auxiliary dozer, so that more foreign matter can be obtained. The effect of preventing entrapment is high.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a backhoe as a work vehicle provided with a dozer device at the front of the machine body. This backhoe
On a machine base 2 which supports a pair of left and right crawler traveling devices 1 and 1 driven by a traveling hydraulic motor M1, a swivel base 3 is swivelable around a vertical axis X by driving a swiveling hydraulic motor M2.
In addition to the above, the swivel base 3 is equipped with a control unit 4, a driving unit 5, and a backhoe device 6 capable of laterally swinging by driving a swing cylinder C1, and the machine base 2 is provided with
The dozer device 16 is vertically movable by driving the dozer cylinder C2 (see FIG. 2).

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 to the front and rear in a pair with the longitudinal direction of the support frame 7 extending in the left-right direction.
On the other hand, the track frame 8 of the left crawler traveling device 1
In this case, the square pipes are provided at the front and rear two positions of the track frame 8 so as to face the inside of the fuselage to form the lateral frames 9, respectively. Then, the tip ends of the square pipes 9 are fitted to the support frame 7 and supported so as to be slidable laterally with respect to the support frame 7. Also on the track frame 8 of the crawler traveling device 1 on the right side, square pipes are projectingly provided at two positions in front of and behind the track frame 8 so as to face the inside of the machine body, and lateral frames 9 are formed respectively. The tip end is fitted to the support frame 7 and is supported slidably in the lateral direction with the support frame 7.

A double-acting hydraulic cylinder C3 for driving the left traveling device and a hydraulic cylinder C for driving the right traveling device for changing and adjusting the interval between the left and right crawler traveling devices 1, 1.
3 and 3 are separately provided on the left and right crawler traveling devices 1 and 1 along the lateral direction between the front and rear support frames 7 so that the left and right crawler traveling devices 1 and 1 are independent of the machine base 2. It is configured to be laterally movable. That is, in the left and right traveling device driving hydraulic cylinders C3, C3, with the cylindrical protection cover 12 covering the entire piston rod 10 side and a part of the cylinder tube 11, the machine base 2 of the cylinder tube 11 is covered. The piston rod 10 is pivotally connected to the track frame 8 and the base end of the cylinder tube 11 to the machine base 2 respectively. One end of the protective cover 12 is fixed by a pin 14 for connecting the tip end of the piston rod 10 and the track frame 8 to each other.

As shown in FIGS. 3 and 4, the dozer device 16 has a main dozer 18 supported by a square pipe support arm 17 whose base end is pivotally connected to the machine base 2 so as to be vertically swingable.
And a pair of left and right ends of the main dozer 18 which are slidable in the left-right width direction so as to be slidable and retractable. The pair of left and right auxiliary dozers 19 and 19 are divided into the main dozer 18 and the auxiliary dozer 19. The hydraulic cylinders C4, C4 for extending / retracting auxiliary dozers, which are laid across the hydraulic cylinders C4, C4 for extending / retracting, are configured to be adjustable individually. It is installed inside a square pipe 20 of an auxiliary dozer 19 which is slidably fitted in a guide pipe 21 on the back of the main dozer 18.

Stretching stroke L1 of the auxiliary dozer 19
Is set to be the same as the lateral movement adjusting stroke L2 of the crawler traveling device 1, and the lateral outer end of the main dozer 18 of the dozer device 16 is, as shown in the crawler traveling device 1 on the right side of FIG. When the crawler traveling device 1 is in the maximum contracted state, that is, in the minimum tread width state, the crawler traveling device 1 is located slightly inward of the lateral outer end of the crawler traveling device 1, and further, as shown in the left crawler traveling device 1. ,
Even when the crawler traveling device 1 is moved by the maximum stroke to the lateral outer side of the machine body, that is, even in the maximum tread width state, the lateral outer end thereof is located on the lateral lateral outer side of the machine body than the lateral inner end of the crawler traveling device 1. Is set.

The lateral outer side plate 18b of the main dozer 18 is disposed in an inclined posture so that the rear end side is located closer to the inside of the body, and the auxiliary dozer 18 is not crushed by the crawler traveling device when the body is back. When foreign matter such as pebbles blown off on the back surface accidentally rides on the upper surface of the square pipe 20 of the auxiliary dozer 19, the auxiliary dozer 19 shrinks and escapes to the outside of the rear portion.

The hydraulic cylinders C3, C3 of the pair of left and right crawler traveling devices 1, 1 and the pair of left and right auxiliary dozers 19,
As shown in the hydraulic circuit of FIG. 5, the 19 hydraulic cylinders C4 and C4 are configured to be simultaneously extendable / contractible via a three-position switching valve V1 and a rotary joint R, and independently operable left and right via a two-position switching valve V2. ing.

[Other Embodiments] As shown in FIG. 6, a protective cover 22 is attached to the back surface of the auxiliary dozer 19 to prevent foreign matter from entering the telescopic fitting portion of the main dozer 18 and the auxiliary dozer 19. You may. In such a case, the protective cover 22
The material of may be an iron plate, rubber, or the like.

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]

1] Overall side view of backhoe

FIG. 2 is a cross-sectional plan view of the airframe.

FIG. 3 is a vertical sectional side view of the dozer device.

FIG. 4 is a perspective view of a dozer device.

[Fig. 5] Hydraulic circuit diagram

FIG. 6 is a perspective view of a dozer device showing another embodiment.

[Explanation of symbols]

 1 Crawler traveling device 16 Dozer device 18 Main dozer 18a Lateral outer edge of main dozer 19 Auxiliary dozer 22 Protective cover L1 Dozer expansion / contraction stroke L2 Crawler adjustment stroke

Claims (2)

[Claims] 1. A dozer device (1) arranged in front of the crawler traveling device (1), in which the distance between a pair of left and right crawler traveling devices (1) is adjustable within a certain range.
6) is composed of a main dozer (18) and an auxiliary dozer (19) fitted to the left and right lateral outer ends of the main dozer in a stretchable manner. The auxiliary dozer (19) is expanded and contracted by a hydraulic cylinder (C4). In a work vehicle with a dozer configured to be driven, a lateral movement adjustment stroke (L) of each crawler traveling device (1) is
In the entire area of 2), the lateral outer end position of the main dozer (18) is set so that the lateral outer end (18a) of the main dozer (18) is always located within the lateral width of each crawler traveling device (1). An extension stroke (L1) of the auxiliary dozer (19) so that the lateral outer end position of the auxiliary dozer (19) can be matched with the lateral outer end position of the crawler traveling device (1).
Is set to be the same as the lateral movement adjusting stroke (L2) in the crawler traveling device (1). 2. A protective cover (22) is attached to the back of each auxiliary dozer (19) to prevent foreign matter from entering the telescopic fitting between the main dozer (18) and each auxiliary dozer (19). The work vehicle with a dozer according to claim 1, wherein the work vehicle has a dozer.