JPH0316920Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is applicable to tracked vehicles such as bulldozers used for general earthworks and snow removal work, with the blades oriented perpendicular to the direction of travel, and the blades oriented to the left or right. The present invention relates to an angling device for displacing in a direction.

<Prior Art> U.S. Pat. No. 3,386,519 discloses a pair of tension rods, one end of which is pivotally connected to the upper and lower ends of each side of a blade, the other end of which is pivotally connected to the other end of the other.
An angle device is disclosed in which one end of a hydraulic cylinder is pivotally connected to the rear end of each side of the C-frame, and the other end of a hydraulic cylinder is connected to the other end of the tension rod.

<Problems to be solved by the invention> Since the above-mentioned angle device has hydraulic cylinders arranged after a pair of tension rods, the rearward length of each side of the C frame is very long, so a special hydraulic cylinder with a long stroke is required. It is necessary to provide a cylinder. In addition, since the housing surrounding this cylinder is an open type, it cannot prevent dirt from entering into the operation of the cylinder, and the complicated mounting structure of the slide mechanism and tension rod formed on the C frame reduces manufacturing costs. It has drawbacks such as the risk of causing a build-up.

<Means for solving the problem> Therefore, the present invention connects the rear end of each side of the C frame and each left and right side of the blade with a telescoping tube, and inserts a telescoping tube into each of the telescoping tubes. The blade is characterized by housing a hydraulic cylinder that operates telescopically and further comprising braces interposed between the telescopic cylinders, their upper ends, and the upper ends of the left and right sides of the blade.

<Operation> When the hydraulic cylinders housed in both the left and right telescoping cylinders are in the neutral state, the blade is oriented perpendicular to the direction of travel, and the left or right telescoping cylinder is extended by one of the hydraulic cylinders in the cylinder, while the other is extended. When shortened, the blade takes an angular motion to the right or left.

<Embodiment> 1 is a track frame which is a part of the body of a tracked vehicle 10, and 2 is a frame C surrounding the front and both sides of the vehicle body.
Frame, 3 indicates the blade. As is well known, in the C-frame 2, the rear surface of the blade is swingably attached to the center of the front portion 2a by a spherical pivot device 2' such as a ball joint type, and the rear end of each side portion 26 is attached to a track by a trunnion 1'. It is pivotally attached to each side of the frame 1, and is adapted to move the C frame 2 and blade 3 upward and downward in response to the operation of a pair of lift cylinders 9.

Now, in accordance with the present invention, the left and right sides of the blade and C
Each side of the frame is connected by a telescopic tube 4 consisting of a front tube 4a and a rear tube 4b that are fitted in a telescopic manner,
A hydraulic cylinder 5 for telescopically operating the telescoping cylinder 4 is housed inside the telescoping cylinder 4.

In this embodiment, the front tube 4a of the telescopic tube has a rear tube 4b fitted on its inner periphery, and ball joint type connectors 4' protruding from the closed front end of the front tube are connected to each side of the blade on the left and right sides. Connected to the bottom bracket. In addition, a connector 5' protruding from the cap end of the hydraulic cylinder housed in the telescoping cylinder connects to the rear cylinder 4.
It protrudes rearward from the closed rear end of C frame and is connected to brackets 6 provided at the rear of each side of the C frame. The rod end side of the hydraulic cylinder 5 is fixed to the front cylinder with a pin 7.

The upper ends of the left and right sides of the blade are connected to the middle of the upper end of the front cylinder, which has a large diameter, by a tension brace 8 whose length is adjustable, such as a tambacle.
Of course, even if the hydraulic cylinder 5 is extended to its maximum extent, the front and rear cylinders of the telescopic cylinder maintain their fitted state. As shown in FIG. 1, when each hydraulic cylinder 5 in each telescoping cylinder is in the neutral position, the telescoping cylinder 4a is also in the intermediate position and fitted into the rear cylinder 4b, and the blade is rotated with respect to the direction of movement of the vehicle body. They are orthogonally oriented.

At this point, the hydraulic circuit for the work equipment of the vehicle (not shown) is activated to extend the hydraulic cylinder of either the left or right telescoping cylinder and shorten the other, as shown in Fig. 2.
As shown by the two-dot chain line of the blade, when the front cylinder 4a is moved forward with respect to the rear cylinder 4b, the blade is tilted forward to the left with respect to the traveling direction of the vehicle body.

Conversely, when one cylinder is shortened and the other cylinder is extended, the blade makes an angle motion to the rear left as shown by the dashed line, and the telescopic cylinder 4a
Move to the rearmost position.

The upper end of each side of the blade is fitted onto the outer periphery of the rear cylinder with a tension rod, and is connected to the front cylinder 4a which moves back and forth together with the blade using a hydraulic cylinder, thus inhibiting the expansion and contraction of the telescopic cylinder. Never. In other words, the blade is angled by moving the brace 8 and the telescopic cylinder 4a forward or backward while maintaining a triangular shape.

<Effect of the invention> In this way, in this invention, the left and right sides of the blade and each side of the C frame are directly connected by a telescoping cylinder that can be expanded and contracted by a hydraulic cylinder, so the backward length of each side of the C frame is relatively small. A cylinder with a short stroke can be used, and the structure is simple. Since each hydraulic cylinder is hermetically housed in its respective telescopic cylinder, it is protected from external invaders such as earth, sand, snow, etc., and has the advantage of not being damaged even when operated for a long time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a plan view of a part of the same, and in the drawing,
Reference numeral 1 indicates a truck frame which is a part of the vehicle body, 2 indicates a C frame, 2a indicates the front part thereof, 2b indicates left and right side parts, 3 indicates a blade, 4 indicates a telescoping cylinder, and 5 indicates a hydraulic cylinder.

Claims (1)

[Claims for Utility Model Registration] It has a C-frame that surrounds the front and both sides of the vehicle body and is pivotally connected to each side of the vehicle body at the rear end of each side, and a blade is located at the center of the front of the C-frame at the center of the rear surface of the blade. In a blade angling device for a tracked vehicle, in which a blade is attached so that it can swing freely, the rear end of each side of the C frame and each left and right side of the blade are connected by a telescoping tube, and each of the above-mentioned telescoping tubes is A blade in a tracked vehicle characterized in that a hydraulic cylinder for telescopically operating the telescoping cylinder is accommodated therein, and a brace is provided between the upper end of each telescoping cylinder and the upper end of each left and right side of the blade. Angling equipment.