JPH0128129Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to an angle tilt dozer used in civil engineering, snow removal, agricultural work, etc.

(Prior art) Conventional angle dozers, for example,
As shown in Japanese Patent Application Laid-open No. 50-102101, a C frame is provided at the front of the vehicle body and is moved up and down by a lift cylinder.
The central part of the blade is connected to the central part of the frame so as to be rotatable in the angle and tilt directions, and both ends of the blade are supported by arms that are moved forward and backward by angle cylinders provided on both sides of the C frame. There are some structures that have this structure.

(Problem that the invention aims to solve) However, in this conventional type, the blade is supported via an arm directly connected to the tip of the piston rod of the angle cylinder, and the operating stroke of the angle cylinder directly corresponds to the amount of angle operation of the blade. Therefore, if a sufficiently large amount of angle operation is required, the angle cylinder must be made larger.

The present invention has been made in view of the above points, and an object of the present invention is to provide an angle tilt dozer equipped with a mechanism that can increase the operating stroke of the angle cylinder and transmit it to the blade.

[Structure of the idea]

(Means for solving the problem) The present invention provides a C frame 4 at the front of the vehicle body 1 that is moved up and down by a lift cylinder 2,
The center part of the blade 6 is rotatably supported by the center part of the frame 4 via the connecting part 5 in the angle direction and the tilt direction, and the tips of the arms 11 on both sides are attached to the lower part of both ends of the blade 6. are rotatably connected to each other, sliders 12 on both sides are connected to the base ends of the arms 11 on both sides, and the sliders 12 on both sides are slid on guide means 14 fixed to both sides of the C frame 4. In a dozer in which angle cylinders 22 are integrally attached to both sides of the C frame 4, the angle cylinders 22 are fitted freely and drive the sliders 12 on both sides along the guide means 14 on both sides. Each sprocket 26 is provided below the angle cylinder 22, and a sprocket 26 is rotatably supported at the tip of the piston rod 23 of the angle cylinder 22 on both sides.
One ends of the chains 27 on both sides, which are wound around the sprockets 26 on both sides and folded back, are respectively connected to a fixed part 21 that is integral with the guide means 14, and the other ends of the chains 27 on both sides are connected to the arms 11 on both sides. The arms 11 on both sides and the upper portions of both ends of the blade 6 are connected via tilt cylinders 32, respectively.

(Function) In the present invention, by pushing out the piston rod 23 of the angle cylinder 22 on one side, the slider 12 on one side is pulled out twice the stroke of the piston rod 23 along the guide means 14 on one side, and One end of the blade 6 is pushed forward via the arm 11, and the angle of the blade is adjusted.

At this time, since the blade 6 is rotated about the connecting portion 5, the other end of the blade 6 is retracted rearward, and the force from the blade 6 forces the slider 12 on the other side backward. is moved to the angle cylinder 22 on the other side via the chain 27 on the other side.
The piston rod 23 is forcibly retracted.

Furthermore, the tilt angle of the blade 6 can also be easily variably adjusted by the expansion and contraction operation of the tilt cylinder 32.

(Example) Hereinafter, the present invention will be explained in detail with reference to an example shown in the drawings.

As shown in FIGS. 1 and 2, the vehicle body 1
A C-frame 4 is provided at the front part of the C-frame 4, which is moved up and down by a pair of lift cylinders 2 around a trunnion 3.
The central portion of the blade 6 is rotatably supported in the angle direction and the tilt direction. Connecting part 5
has a rotation shaft 7 for tilting in the longitudinal direction and a rotation shaft 8 for angle rotation in the vertical direction.

Further, as shown in FIGS. 3 to 5, the tip of an arm 11 is rotatably connected to the lower part of both ends of the blade 6, and the base end 1 of the arm 11 is
1a and a spherical bearing body 13 integrally protruding from the side surface of the slider 12 are rotatably fitted and connected, and the slider 12 is fixed to the upper surface of both sides of the C frame 4, as a guide rail as a guide means. 14 so that it can slide freely. This guide rail 14
A horizontal hole 15 into which the slider 12 fits is provided from the front end to the rear end, and this horizontal hole 1
The slider 12 is provided with a chain insertion hole 16 on the upper surface along the guide rail 14, and the slider 12 is provided with a groove 17 on the lower surface that fits into the lower part of the guide rail 14.

Further, a cylinder mounting plate 21 is fixed to the upper surface of the central portion of the guide rail 14, and an angle cylinder 22 arranged along the guide rail 14 is fixed to this cylinder mounting plate 21. This angle cylinder 22 is a single-acting cylinder that is driven by hydraulic pressure only in the direction in which the piston rod 23 is extended, and the piston rod 23 of the angle cylinder 22 on one side
The action of retracting is performed by pushing out the piston rod of the angle cylinder on the other side. 24 is a hydraulic supply pipe, and 25 is a breather.

Also, the piston rod 2 of the angle cylinder 22
A sprocket 26 is rotatably supported at the tip of the cylinder mounting plate 21, and one end of a link chain 27 that is wrapped around the sprocket 26 and folded back is fixed to the guide rail 14 as an integral part of the cylinder mounting plate 21.
The other end of the link chain 27 is connected to the slider 12 of the arm 11. 2
8 is a chain stop pin provided on the cylinder mounting plate 21, and 29 is a chain stop pin provided on the slider 12.

In addition, the arms 11 on both sides and the upper parts of both ends of the blade 6 are connected to the rod member 31 by the tilt cylinder 3.
2 are connected via an extendable support member which is continuously fixed. This tilt cylinder 32 is also a single acting cylinder that is hydraulically driven only in the direction in which the piston rod 33 is extended. 34 is its hydraulic supply pipe. Note that a double-acting cylinder may be used as the tilt cylinder 32.

3 and 4, the angle cylinder 22, piston rod 23 and link chain 27 are completely covered by a protective cover 35 fixed to the upper surface of the guide rail 14. As shown in FIGS. The parts corresponding to the piston rod 23 and the link chain 27 are covered with a removable cover (not shown) using bolts or the like, and can be opened and closed during repair and inspection.

The tip of the arm 11 and the piston rod 33 of the tilt cylinder 32 are connected to the blade 6 via a horizontal shaft 36 and a common vertical shaft 37, and have a connection structure that allows them to rotate vertically and horizontally.

Next, to explain the operation, when one of the angle cylinders 22 on both sides is driven to push out the piston rod 23, as shown in FIG. The chain 27 is pulled, and the chain 27 causes the slider 1 of the arm 11 to
2 is the piston rod 2 of the angle cylinder 22
Guide rail 1 for a distance twice the stroke of 3.
4, one side of the blade 6 is pushed forward, and the blade 6 is angled around the rotating shaft 8. At the same time, the angle cylinder on the other side is compressed by a retraction force applied from the blade 6 to the piston rod via the arm and chain.

Further, when tilting the blade 6, one of the tilt cylinders 32 on both sides interposed between the arms 11 on both sides and the blade 6 is driven and the piston rod 33 is pushed out. The arm 11 of the slider 12 is rotated upward around the spherical bearing body 13 of the slider 12, and the blade 6
Raise one side and rotate the blade 6 around the rotating shaft 7.
Tilt operation.

In addition, when using a double-acting tilt cylinder,
The piston rod 33 of one tilt cylinder is moved by simultaneously driving both tilt cylinders in opposite directions.
By simultaneously pushing out the piston rod of the other tilt cylinder and retracting the piston rod of the other tilt cylinder, the arm 11 is rotated upward around the spherical bearing body 13 of the slider 12, one side of the blade 6 is raised, and the blade is rotated around the rotation axis 7. 6. Tilt operation.

Other embodiments of the invention In the above embodiments, one sprocket 2
6 and one chain 27 are used, however, a plurality of sprockets may be pivotally supported at the tip of the piston rod 23 of the angle cylinder 22, and a plurality of chains may be wound around this and connected to the slider 12. In this way, the durability of the chain can be increased.

The tilt cylinder 32 may also be replaced by a mechanical brace, such as a turnbuckle.

Further, the fitting structure between the slider 12 and the guide rail 14 may be the following structure other than the above. That is, as shown in FIG.
A chevron-shaped lower guide rail 14a is provided on the lower side of the
This lower guide rail 14a and an inverted V-shaped groove 12a formed on the lower surface of the slider 12 are slidably fitted, and the upper surface of the slider 12 is held flat by the upper guide rail 14b. In this way, the vertical and horizontal sliders 1
The movement of 2 can be regulated. The present invention is not limited to this structure, and any other structure may be used as long as the movement of the slider 12 in the vertical and horizontal directions can be restricted.

Further, the guide means for the slider 12 is not limited to the guide rail 14, and the angle cylinder 2
2 is fixed to the guide rail 14,
Other fixing structures may be used, and the attachment portion of the link chain 27 on the side other than the slider 12 is not limited to the attachment plate 21 as long as it is integrated with the guide rail 14. For example, as shown in FIGS. 8 and 9, a guide rail 14a fixed on the C frame 4 and a guide rail 1
A guide means is constituted by a guide pipe 14b further fixed on the base plate 4a via a base plate 41 and a support plate 42, and the slider 12 is slidably fitted between the guide rail 14a and the guide pipe 14b. , the cylindrical portion 12a of the slider 12 is slidably fitted to the outer peripheral surface of the guide pipe 14b, and an angle is supported inside the guide pipe 14b by a clevis 43 and via a spacer 44. cylinder 22
A sprocket 26 is rotatably supported on the tip of the piston rod 23 protruding from the angle cylinder 22, and is movably fitted in grooves 45 provided in the upper and lower parts of the guide pipe 14b. One end of the link chain 27 wrapped around the guide pipe 14 and folded back
b and a convex portion 46 as an integral fixed portion by welding.
At the same time, the other end of this link chain 27 is connected to the slider 12. 35 is a protective cover.

[Effect of idea]

According to the present invention, the sliders on both sides are provided movably along the guide means on both sides provided below the angle cylinders on both sides, and the angle cylinder, sprocket, and chain are used for the sliders on both sides. Since the slider on one side and the slider on the other side are linked via the blade, the double feed mechanism functions as a blade angle adjustment mechanism when used as a pair. A sufficiently large amount of blade angle operation can be obtained by the cylinder. Furthermore, in addition to the angle adjustment mechanism described above, a tilt cylinder is interposed between the upper part of the blade and the arm, so the operator can extend and retract the tilt cylinder from the driver's seat to tilt the blade. The corners can also be easily adjusted.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the angle tilt dozer of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a perspective view of its main parts, Fig. 4 is a sectional view thereof, and Fig. 5
The figure is a perspective view of the slider part, and Figure 6 is a partially cutaway front view explaining the action of the angle cylinder.
FIG. 7 is a sectional view showing another embodiment of the guide rail, FIG. 8 is a front view showing another embodiment of the guide means and angle cylinder mounting means, and FIG. 9 is a sectional view thereof. 1...Vehicle body, 2...Lift cylinder, 4...C
Frame, 5... Connection portion, 6... Blade, 11
. . . Arm, 12 . ...Chain, 32...Tilt cylinder.

Claims (1)

[Claims for Utility Model Registration] (1) A C-frame is provided at the front of the vehicle body that is moved up and down by a lift cylinder, and the central part of the C-frame is used to angle the central part of the blade via a connecting part. The tips of the arms on both sides are rotatably connected to the lower parts of both ends of the blade, and the sliders on both sides are connected to the base ends of the arms on both sides. Connect the sliders on both sides,
A dozer in which angle cylinders are integrally attached to both sides of the C frame, each slidably fitting into guide means fixed to both sides of the C frame, and driving sliders on both sides along the guide means on both sides. In this method, the guide means on both sides are provided under each of the angle cylinders, the sprockets are rotatably supported at the tips of the piston rods of the angle cylinders on both sides, and the guide means are wound around the sprockets on both sides and folded back. One ends of the chains on both sides are connected to a fixed part integral with the guide means, and the other ends of the chains on both sides are connected to the sliders of the arms on both sides. An angle tilt dozer characterized in that the upper part of the dozer is connected to the upper part of the dozer via a tilt cylinder. (2) An angle tilt dozer according to claim 1 of the utility model registration, characterized in that sprockets and chains are arranged in multiple rows.