JPS5853337Y2 - Dozer device that can rotate and tilt the blade left and right - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that angles (swivels left and right) and tilts (tilts up and down) the blade (earthwork plate) of a bulldozer, and in particular, in a configuration that combines the functions of angle and tilt, a hydraulic jack for tilting is used. is provided at a position almost parallel to the angle hydraulic jack, and is pivotally connected to the back of the blade via a bell crank, so that the jack and hydraulic piping are not damaged by earth and sand, and there is no need for a protective member.

In a bulldozer as an earthmoving machine, the brake attached to the tractor body is rotated around the vertical axis of the pivot part of the mounting frame to displace and tilt the left and right ends of the blade in the front-back direction (left-right rotation). Also, by rotating the pivot part of the mounting frame about the horizontal axis, the left and right ends of the blade can be displaced (tilted) in the vertical direction.
It is already generally known that

By the way, in a conventional device that can both turn left and right and tilt, a hydraulic jack for tilting that changes the left and right height of the blade relative to the ground and tilts it is shown in Fig. 4 as an example. In addition, the mounting frame and the blade are connected directly or indirectly, and in either case, a hydraulic tilting jack is mounted close to the back of the blade.

For this reason, during operation, the tilting hydraulic jack is often damaged by dirt and the like.

In addition, since the hydraulic power source that operates the hydraulic jack is located in the tractor body, the distance of piping and hoses that connect the hydraulic power source and the tilting jack is long, and these piping are susceptible to damage due to dirt, etc. There are many.

Therefore, a cover member is required to protect the hydraulic jack and the hydraulic conduit from damage, which increases costs accordingly.

Furthermore, since the hydraulic jack for tilting is mounted close to the back of the blade, there is not enough space, which inevitably creates many obstacles in selecting the capacity of the tilting jack in a rational and economical manner. There were drawbacks such as:

This invention is particularly intended to solve these problems with a dozer whose blade can be turned and tilted left and right.

Therefore, the purpose of this invention is to provide a device in which the tilting hydraulic jack is located far from the brake and is less likely to be damaged, and the purpose of this invention is to provide a protective cover for the tilting hydraulic jack and its hydraulic pipe The goal is to eliminate the need for
A further object of this invention is to enable the external dimensions of the tilting hydraulic jack to be freely designed.

That is, in this invention, as in the embodiment shown in FIGS. 1 to 3, a blade 1 which can be turned left and right and tilted is attached to a mounting frame 2 which is pivotally connected to a tractor body 4 via a ball joint 7. In the bulldozer, bracket parts 5 and 12 are provided on the left and right sides and the center of the mounting frame 2, respectively.
is raised upward, and one end of a double-acting hydraulic jack for tilting 19 is pivotally connected to the upper part of either the left and right bracket portions 5, and the left and right rear surfaces of the blade 1 and the bracket portion 5 are connected to each other.
A pair of double-acting hydraulic jacks 9 for left and right turning are passed between the bracket part 12 which stands up at the front of the mounting frame 2, and one end of the bell crank 13 is attached to the bracket part 12. The bent portion is pivotally connected to the upper back surface of the blade 1, and the other end of the bell crank 13 is pivotally connected to the other end of the double-acting hydraulic jack for tilting 19, and the bell crank The present invention relates to a lowering device capable of turning and tilting the blade left and right, characterized in that ball joints 14°15.16 are attached to each of the 13 pivot points.

An embodiment of this invention will be described with reference to FIGS. 1 to 3.

The mounting frame 2 for the bulldozer blade 1 is U-shaped and is attached at both ends to the front part of the tractor body 4 by transverse pivots 3 .

The mounting frame 2 has bracket portions 5 rising on its left and right sides, and between the bracket portion 5 and the tractor body 4,
The lift hydraulic jack 6 is pivotally mounted, and the jack 6
The mounting frame 2 can be tilted slightly by the operation of the .

The blade 1 is connected to the center of the optical surface of the mounting frame 2 via a ball joint 7 at the lower center of its back surface, and the blade 1 can be oscillated left and right up and down.

Further, brackets 8 are fixedly installed on the left and right sides of the rear surface of the blade 1, and a pair of double-acting hydraulic jacks 9 for left and right turning are passed between the brackets 8 and the bracket part 5 of the mounting frame 2, and the brackets 8 are pivotally mounted. Ru.

Ball joints l- are provided at both ends of the jack 9, respectively.
10 and 11 are provided, and by expanding and contracting the left and right jacks 9 in opposite directions, the blade 1 can assume a left-right turning attitude, as shown by the chain lines in FIG.

A bracket part 12 stands up in the center of the front part of the mounting frame 2, and one end of a substantially triangular bell crank 13 is connected to a ball joint 14 as shown in FIG.
It is pivotally connected via.

The bent front end of the bell crank 13 is attached to a bracket 18 fixed at the center of the upper back of the blade 1.
It is pivotally connected via a ball joint 15.

A tilting double-acting hydraulic jack 19 is pivotally connected between the other end of the bell crank 13 and the bracket portion 5 provided on one side of the mounting frame 2.

Ball joints 16 and 17 are provided at both ends of the tilting double-acting hydraulic jack 19, respectively.

Furthermore, the middle part of the bell crank 13 and the mounting frame 2
A rod 20 as shown in FIGS. 1 and 3 is vertically connected between the bell crank 1 and the bell crank 1.
I support 3.

Next, the operation will be explained.

First, for left and right rotation, the ball joint 7 connecting the mounting frame 2 and the blade 1 is connected to the ball joint 15 connecting the front end of the bell crank 13 and the central bracket 18 of the blade 1. Centered around the axis,
The left and right turning operation is performed by extending and contracting the double-acting hydraulic jack 9 for left and right turning.

At this time, the hydraulic circuit of the left and right turning jack 9 is set so that when either the left or right side is extended, the other side is shortened, and as shown by the chain line in FIG. The blade 1 can be tilted with respect to the blade 1.

This causes a push up to the left or right. Next, regarding tilting, by expanding and contracting the double-acting hydraulic jack 19 for tilting, the bell crank 13 is connected to be able to swing freely.
The blade swings around the ball joint 14 that connects to the mounting frame 2, and tilts around the ball joint 7 that connects the mounting frame 2 and the blade 1 due to the displacement of the ball joint 15. , the blade 1 can be tilted with respect to the ground, as shown by the chain line in FIG.

At this time, since the blade 1 is tilted around the ball joint 7, the left-right turning hydraulic jack 9 can be slightly displaced around the ball joint 11.
This is within a practically acceptable range.

As explained above, according to this invention, the blade is
In addition to being securely held against the mounting frame 2, the tilting hydraulic jack 19 is not mounted close to the blade, but is installed above and almost parallel to one side of the left/right turning hydraulic jack 9, making the work easier. Hydraulic jack for tilting 1
9, and there is no risk of damage to the hydraulic pipes by earth and sand.

Furthermore, since the tilting hydraulic jack 19 is not directly pivotally connected to the blade, there are advantages such as freedom in selecting design dimensions.

[Brief explanation of drawings]

Figures 1 to 3 show the dozer device according to this invention,
FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a perspective view of a conventional example. In the figure, 1 is a blade, 2 is a mounting frame, 4 is a tractor body, 5 is a bracket part, 7 is a ball joint joint, 9 is a double-acting hydraulic jack for left and right turning, 12 is a bracket part, 13
1 is a bell crank, 14, 15, 16 are ball joints, and 19 is a double-acting hydraulic jack for tilting.

Claims (1)

[Scope of utility model registration request] In a bulldozer, which has a blade that is rotatable and tiltable to the left and right via a ball joint on a mounting frame that is pivotally connected to the tractor body, bracket portions are provided upwardly on the left and right sides of the mounting frame and at the center thereof, respectively. Raise it up and place it on the top of either of the left and right bracket parts,
One end of a double-acting hydraulic jack for tilting is pivotally mounted, and a pair of double-acting hydraulic jacks for left and right swinging is passed between the left and right rear surfaces of the blade and the bracket portion and is pivotally mounted, and the front part of the mounting frame is On the bracket part that was raised up,
One end of the bell crank is pivotally connected with its bent portion being pivotally connected to the upper back surface of the blade, and further, the other end of the bell crank is pivotally connected to the other end of the double-acting hydraulic jack for tilting. . A dozer device capable of turning and tilting the blade left and right, characterized in that each pivot point of the bell crank is equipped with a ball joint.