JPH0634432Y2 - Bulldozer earthmoving equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an earthworking device for a bulldozer capable of tilting and tilting a blade.

[Prior Art] Conventionally, various bulldozer earthmoving apparatuses have been proposed in which a blade can perform an angle and tilt operation. For example, JP-A-52-126901.

[Problems to be solved by the invention]

However, the conventional earthmoving apparatus requires a lift cylinder for moving the blade up and down, a pair of left and right angle cylinders for performing an angle operation, and a tilt cylinder for tilting the blade, which makes the structure complicated and expensive. There was a problem such as becoming.

[Means and Actions for Solving Problems]

This invention was made in order to improve the above-mentioned inconvenience, and a cross frame was laid horizontally between the left and right track frames constituting the suspension, and a blade was rotatably attached to the tip of this cross frame. The base end side of the U frame is pivotally attached, the lower end of the swing link is pivotally attached to the middle part of the U frame, and the tip of the angle lift cylinder and one end of the brace member are pivotally attached to the upper end of the swing link. Another object of the present invention is to provide an earthworking device for a bulldozer in which the other end of the brace member is pivotally attached to the back surface of the blade so that the pair of left and right cylinders can perform blade lifting and angle operations.

〔Example〕

 An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 is a main body of an earthworking apparatus, which has a U-shaped frame (hereinafter referred to as a U frame) 2.

Reference numeral 3 is a foot around a bulldozer (not shown), and an idler 5 and a sprocket (not shown) are provided in front of and behind the left and right track frames 4, and an endless track 22 is wound between the idler 5 and the sprocket. Along with
A cross frame 6 is laid horizontally between the left and right track frames 4.

The cross frame 6 has two horizontal rods 6a that are parallel to each other, and a pair of gate-shaped brackets 7 are provided between the upper surfaces of the horizontal rods 6a so as to be spaced apart in the vehicle width direction. An open end side of the U frame 2 provided so as to be positioned between the legs 3 is rotatably pivotally attached to a lower portion of the bracket 7 by a pin 8.

The lower ends of a pair of left and right swing links 9 are pivotally attached by pins 10 slightly forward of the middle portion of the U frame 2, and the base ends of the swing links 9 are attached to the brackets. A tip end of an angle lift cylinder 12 pivotally attached to the top of 7 by a pin 11 and one ends of a pair of left and right brace members 13 are pivotally attached by a pin 14. The other end of the brace member 13 is attached via a cross joint 16 to a bracket 15a projecting from lower portions of both ends of the back surface of the blade 15.

On the other hand, on the bracket 15b protruding from the lower center of the back surface of the blade 15, the tip of a support shaft 17 that is rotatably projected from the front portion of the U frame 2 is supported via a ball bearing 18. One ends of a pair of left and right holding links 19 are attached to a bracket 15c protruding above the bracket 15a via a cross joint 20.

The other end of each holding link 19 is pivotally attached by a pin 21 to a bracket 13a projecting from one end of the brace member 13 to configure the whole.

Next, the operation will be described. When the blade 15 is moved up and down, the left and right angle lift cylinders 12 are simultaneously expanded and contracted. As a result, the tip end side of the U frame 2 moves up and down around the pin 8 so that the blade 15 can be moved up and down as shown by the phantom line in FIG.

When operating the blade 15 in an angled manner, one of the left and right angle lift cylinders 12 is extended and the other is shortened.

As a result, one of the swing links 9 swings to the position of the phantom line A shown in FIG. 2 and the other swings to the position of the phantom line B, so that the blades 15 center around the spherical bearing 18 and the phantom line in FIG. By rotating the blade 15 as shown in FIG. 5, the angle operation of the blade 15 can be performed.

Further, if the holding link 19 is composed of a cylinder in advance, the pitch operation of the blades 15 can be performed by expanding and contracting this cylinder.

[Effect of device]

As described in detail above, this device can perform vertical movement and angle movement of the blade with only a pair of left and right cylinders.
The structure and hydraulic piping are greatly simplified as compared with the conventional one provided with a large number of cylinders, and the weight and price can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a plan view, FIG. 2 is a side view, and FIG. 3 is a sectional view taken along line III-III in FIG. 2 is a U frame, 3 is a suspension, 4 is a track frame, 6 is a cross frame, 9 is a swing link, 12 is an angle lift cylinder, 13 is a brace member, and 15 is a blade.

Claims (1)

[Scope of utility model registration request] 1. A base of a U frame 2 in which a cross frame 6 is laid horizontally between left and right track frames 4 which form a suspension 3, and a blade 15 is rotatably attached to the cross frame 6 at its tip end. The end side is pivotally attached, the lower end of the swing link 9 is pivotally attached to the middle portion of the U frame 2, and the tip of the angle lift cylinder 12 and one end of the brace member 13 are pivotally attached to the upper end of the swing link 9. Further, an earthworking device for a bulldozer in which the other end of the brace member 13 is pivotally attached to the back surface of the blade 15.