JP3735961B2 - Tractor offset mower support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for an offset mower of a tractor that can be hung on the side of a tractor vehicle body to perform mowing work .
[0002]
[Problems to be solved by the invention]
In a tractor offset mower that hangs mowers at the tip of the lift arm and offsets to the side of the car body to perform mowing, the pivot center of the lift arm is the center part of the front part or rear part of the car body. In many cases, the lift arm becomes longer, the working position of the mower moves away from the cockpit, and the operability is lowered.
[0003]
[Means for Solving the Problems]
In the present invention, a pair of left and right arms 34 and 35 are supported at the rear part of the vehicle body 3 of the tractor so as to be independently rotatable around a single swing shaft 33 arranged in the vertical direction. The lift arm 2 hangs the mower 1 at the end of the arm and rotates the lift arm 2 so as to project freely up to the gap 6 between the wheel 5 of the tractor and the vehicle body 3 on the inside. while supporting rotatably the hydraulic cylinder 42 about pivot axis 7 of the upper downward,
A tractor offset mower support structure is provided in which the other left and right arms 35 support a hydraulic tank T filled with oil to be sent to the hydraulic cylinder 42.
[0004]
【The invention's effect】
When mowing the side of the vehicle body 3 on the side, for example, the lift arm 2 is turned in the horizontal direction around the vertical turning shaft 7, and the mower 1 suspended from the lift arm 2 is placed on the side. approach is to do the mowing while traveling. When the mower 1 is housed, the lift arm 2 is swung around the swivel shaft 7 and positioned at the rear side of the vehicle body 3 or within the width of the left and right wheels 5 behind the vehicle body 3. .
[0005]
Since the pivot shaft 7 for rotating the lift arm 2 base in the horizontal direction in this manner is provided in the space 6 between the tractor wheel 5 and the vehicle body 3 on the inside, the mower 1 is offset with respect to the vehicle body 3. even, more information also is rotated by projecting the lateral side towards beyond the upper wheel 5 can be carried out rather less is lateral inclination swinging of the vehicle body 3, a stable cutting operation. Further, the length of the lift arm 2 of the mower 1 can be shortened, and the turning shaft 7 can be installed at a position close to the cockpit to improve the operability.
In addition, when traveling with the mower 1 positioned between the left and right wheels 5, the swivel shaft 7 portion of the lift arm 2 is inside the wheel 5 and does not protrude laterally, so that it may contact an obstacle or the like. A little safe.
Further, since the arm 35 having the oil tank T is supported on the swing shaft 33 that supports the base portion of the lift arm 2 , the vehicle body 3 can be balanced in the left-right direction.
[0006]
【Example】
The tractor body 3 is a four-wheel steering mode in which the front wheel 8 and the rear wheel 5 can be steered by the steering handle 9 and can be driven by the engine E mounted in the front bonnet 10. It is said. 11 is a cockpit, and 12 is a side deck provided on both left and right sides of the cockpit 11, which is provided at a higher position than the front deck 13.
[0007]
At the front of the vehicle body 3, a front axle housing 16 having a frontal portal shape is provided at the front end of the transmission case 14 so as to be rotatable around a center pivot 15. The case 17 is configured to be steered and linked via a steering arm 19 rotated by a steering cylinder 18, and the front wheel 8 is mounted on the steering case 17 and a transmission mechanism in the mission case 14. It is transmitted by.
[0008]
A rear axle housing 4 having a frontal portal shape is fixed by a bracket 21 below the rear portion of the vehicle body 3, and a rear wheel 5 is mounted on a steering case 22 on both the left and right sides, and the steering cylinder 18 and the like. At the same time, the steering cylinder 24 driven by the operation of the steering handle 9 is steered via the steering arm 25 and the like, and from the transmission shaft 26 of the transmission case 14 through the transmission shaft in the rear axle housing 4 and the like. Wheel 5 is transmitted.
[0009]
A main lift arm 27 is supported around the left and right arm shafts 28 on the front side of the rear axle housing 4 and can be moved up and down by a hydraulic expansion / contraction lift cylinder 29 accommodated along the rear end of the vehicle body 3. it can. The main lift arm 27 has a hitch 31 at the rear end portion to which the work implement can be mounted. In addition, when the main lift arm 27 is raised to the uppermost position and positioned inside the rear end portion of the vehicle body 3, By passing the lock pin 30 between the left and right side portions, the main lift arm 27 can be prevented from moving downward and fixed to the vehicle body 3.
[0010]
A bracket 32 having a square shape in plan view is attached to the rear portion of the vehicle body 3, and a vertical swing shaft 33 is provided on the bracket 32, and a pair of left and right swing arms 34 and 35 are rotatably supported. The pump P1 and the sub pump P2 are attached and interlocked by the PTO shaft 37 taken out from the PTO case 36 at the rear of the vehicle body 3.
[0011]
The lower swing arm 34 supported by the swing shaft 33 can project back and forth by projecting to the inner space 6 of the rear wheel 5 on the laterally outer side. The bracket 32 can be fixed by insertion. Further, it can be fixed in the same way at the backward turning position.
At the tip of the swing arm 34, there is a hitch 38 that can be swung around the swing shaft 7 in the vertical direction. The swivel position is between the lock plate 39 on which the pin hole is disposed and the pin hole of the swing arm 34. The turning position of the hitch 38 can be fixed by inserting the lock pin 40 over the distance.
[0012]
The lift arm 2 is attached to the hitch 38 so as to be rotatable up and down around an arm pin 41 in the horizontal direction, and a lift cylinder 42 that moves up and down the lift arm 2 is attached. The lift arm 2 and the lift cylinder 42 can protrude laterally outward beyond the upper side of the rear wheel 5.
The mower deck 48 of the mower 1 is suspended and attached to the tip of the lift arm 2 via parallel links 43 and 44, a pivot shaft 45, a bending shaft 46, a rolling shaft 47, and the like. The pair of upper parallel links 43 are arranged in the direction of the lift arm 2 so as to be swingable and swingable to the left and right by the expansion and contraction of the swing cylinder 49 by hydraulic pressure between the lift arm 2 and the parallel link 43. Thus, the offset position of the mower 1 is determined.
[0013]
The swivel shaft 45 is formed by fitting an integral swivel shaft 45 to the boss 51 of the lower link 50 connected to the lower end of the upper parallel link 43 at the center of the disc 53 in which the pin hole 52 is disposed. The lock pin 55 can be inserted between the pin hole 52 of the circular plate 53 and the pin hole 54 of the lower link 50 so that the direction of the lower parallel link 44 can be determined. An upper side link 56 of the parallel link 44 is connected to the lower side of the circular plate 53 so as to be rotatable left and right by a horizontal bending shaft 46, and a pair of lower parallel links 44 are suspended along the direction of the bending shaft 46. It can be swung down.
[0014]
The rolling shaft 47 connects the lower side link 57 of the lower parallel link 44 and the bracket 58 integral with the mower deck 48, and is suspended so that the mower deck 48 can rotate about the rolling shaft 47 along the front-rear direction. Composed.
The mower deck 48 is connected in two or three directions in the left-right direction. The connecting portion has a hinge 59 at the upper part, and the mower deck 48 directly connected to the lower part of the lower parallel link 44 is a main deck A. If the mower deck 48 connected to the left and right adjacent to this is the sub deck B or C, the angle around the hinge 59 can be changed and fixed between the main deck A and the sub deck B or C. The adjustment position can be fixed by connecting the arm 60 between the two arms 60.
[0015]
Each mower deck 48 has a blade rotatably mounted on the lower surface thereof, and a transmission case 62 having a transmission mechanism for transmitting the blade shaft is provided on the upper surface, and between the transmission cases 62 is composed of a universal joint, an expansion shaft, or the like. By interlocking with the transmission shaft 61 and driving the hydraulic motor M on the main deck A with hydraulic pressure, the blade shafts can be rotated in conjunction with each other to perform mowing. Each deck A, B, C has a gauge wheel 63 on the front side and a roller 64 on the rear side.
[0016]
The upper swing arm 35 is shorter than the lower swing arm 34 and is formed in a bifurcated shape, and a support arm 66 is connected horizontally by a vertical folding shaft 65 so as to be freely rotatable. An oil tank T is mounted on the support arm 66. The oil tank T can be fixed to the support arm 66 with a fastener 67, and the mounting position can be adjusted. If the support arm 66 is rotated around the folding shaft 65 and folded to the swing arm 35 side, the swing arm 35 is defined as the lower swing arm 34 even when the oil tank T is attached. It can be independently rotated left and right around the swing shaft 33, and this rotational position can be fixed by the lock pin 76 in the same manner as the lock pin 36.
[0017]
Further, as shown in FIG. 9, the hydraulic circuit of the tractor includes oil pumps P1 and P2 driven by the PTO shaft 37, and oil sucked from the oil tank T through the relief valves 68 and 69 and the arm operation lever 70. To the arm control valve 71 operated by the motor and the mower drive valve 73 operated by the mower operation lever 72, the lift cylinder 42 and the swing cylinder 49 are operated, and the motor M of the mower 1 is driven to each deck. The blades 75 of A, B, and C are rotated to cut grass . Moreover, the flow of the oil of these each part is connected with a flexible pipe.
[0018]
An operation lever 74 for operating the lift cylinder 29 for raising and lowering the main lift arm 27 is disposed on the side of the cockpit 11 together with a hydraulic control valve and the like, but the arm operation lever 70 and the mower operation lever 72 are provided by these arms. It is arranged on the side of the dashboard together with the control valve 71, the mower drive valve 73 and the like. The arm control valve 71 extends and retracts the lift cylinder 2 by tilting the arm operation lever 70 in the front-rear direction, and elongates the swing cylinder 49 by tilting in the left-right direction. Thus, the parallel link 43 is configured to be operated in conjunction with the relationship of swinging left and right.
[0019]
The mower 1 selects the attachment / detachment of the main deck A and the sub-decks B and C, the connection angle between them, and the like according to the form of the ground for the mowing work. When performing wide surface cutting, the decks A, B, and C are arranged on the same plane. When cutting the trapezoidal cross section, the main deck A should be along the upper surface of the ridge. As a horizontal state, the left and right side sub-decks B and C are set at an angle along the slope on each side. In addition, when the ridge surface is a slope cut only on one side with the top surface, remove the sub-deck B or C on the side that does not cut, or fix it at an angle raised upward, To do.
[0020]
Even if the distance between the vehicle body 3 and the shore changes during the cutting operation, the moving position of the mower 1 can be adjusted by the swinging of the parallel link 43 by the swing cylinder 49, and the shore can be bent, Even when inclined, the mower 1 is advanced along the shore by movement around the bending shaft 46, the rolling shaft 47, etc., and smooth cutting is performed. Further, when the height of the shore changes, the height of the lift arm 2 is changed, and the mower 1 can be moved up and down in parallel by rotating the lower parallel link 44 in the front-rear direction.
[0021]
In a state where the swing arm 34 is directed to the side and the mower 1 is suspended to the offset position, the support arm 66 of the oil tank T is also rotated to an appropriate angular position with the swing arm 34 directed to the opposite side. Thus, the left and right balance of the vehicle body 3 is achieved by the weight of the oil tank T and the mower 1. The swing arm 34 supports the lift arm 2 as a structure that can swing horizontally around the swing shaft 33. However, the swing arm 34 is configured to support the lift arm 2 by providing a fixed support portion on the vehicle body 3. Good. A bracket 32 is attached to the main lift arm 27 (not shown), the main lift arm 27 is fixed at a fixed position by a lock pin 30, and the lift arm 2 is directly or indirectly attached to the bracket 32. It is good also as a structure which supports.
[0022]
In FIG. 8, the rotation direction of the blades 75 of the main deck A and the sub decks B and C in the mower deck 48 is the same as the blade rotation direction b of the sub deck B on one side with respect to the blade rotation direction a of the main deck A. The blade rotation direction c of the sub deck C on the other side is set in the opposite direction so that the grass to be cut is collected to the center side or the outside. The blade rotation direction c of the sub deck C may be switched between forward rotation and reverse rotation.
[Brief description of the drawings]
FIG. 1 is an overall perspective view.
FIG. 2 is a perspective view of a lift arm support portion of a vehicle body.
FIG. 3 is a perspective view of a lower mower suspension.
FIG. 4 is a front view of a lift arm support portion of a vehicle body.
FIG. 5 is a plan view thereof.
FIG. 6 is a front view of a swing arm portion and a plan view of a part thereof.
FIG. 7 is a partial front view, a side view, and an exploded perspective view of a lower mower suspension.
FIG. 8 is a front view of Mohr.
FIG. 9 is a block diagram of a hydraulic circuit and a plan view of an operation lever portion.
FIG. 10 is a plan view and a side view of the mower.
FIG. 11 is a side view of the tractor.
[Explanation of symbols]
T Hydraulic tank 1 Moore 2 Lift arm 3 Car body 4 Rear axle housing 5 Rear wheel 6 Spacing section 7 Turning axis
33 Swing axis
34 Swing arm
35 Swing arm
42 Lift cylinder

Claims (1)

A pair of left and right arms 34 and 35 are supported on the rear part of the vehicle body 3 of the tractor so as to be independently rotatable around a single swing shaft 33 arranged in the vertical direction. A lift arm 2 that hangs the mower 1 at the end of the arm and a hydraulic cylinder 42 that rotates the lift arm 2 are configured to protrude up to a gap 6 between the wheel 5 and the inner vehicle body 3. while rotatably supported up and down direction of the pivot axis 7 around
A tractor offset mower support structure in which the other left and right arms 35 support a hydraulic tank T filled with oil to be sent to the hydraulic cylinder 42.

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