JPH0576227A - Tractor mower - Google Patents

Abstract

PURPOSE:To reduce need for arranging a reinforcing member onto the upper face of a mower by each fitting the mower and a grounding link to a lift link. CONSTITUTION:A mower 4 and grounding link 5 are each fitted to a lift link 3 and the lift link 3 is lifted and lowered by expansion and contraction of a lift cylinder to a car body 1. Even if the load to the lift link is largely changed, the load does not directly act on the mower and the constitution can be simplified and lightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower mounted on a tractor.

[0002]

2. Description of the Related Art When mounting a mower on a tractor vehicle body, a support member having a grounding wheel is attached to a mower deck, and the support member is attached to a lift link which is elevated and lowered with respect to the vehicle body ( However, since the supporting member is attached to the lift link, the structure becomes complicated, and the vertical rocking force of the mower deck or the grounding wheel changes greatly. However, it is easy for the mounting portion between the supporting member and the lift link to be unreasonable, and in order to prevent this damage, a considerable reinforcement structure must be taken.

[0003]

The present invention has a structure of a tractor mower in which a mower 4 and a ground wheel 5 are separately mounted on a lift link 3 which is lifted and lowered by a lift cylinder 2 with respect to a vehicle body 1. ..

[0004]

Since the mower 4 and the grounding wheel 5 are separately attached to the lift link 3, the lift link 3 is connected to the vehicle body 1 and the lift cylinder 2 is expanded and contracted to move up and down. can do. During the mowing operation by the mower 4, the grounding wheel 5 is in a state of touching or approaching the mowing ground, so that the mower 4, the grounding wheel 5 or the like is pushed up or hangs down due to changes in the unevenness of the ground.
In particular, the grounding wheel 5 may be pushed up strongly, and even if there is a large load variation on the lift link 3, the mower 4 and the grounding wheel 5 are separately mounted to the lift link 3, It does not work directly on the mower 4, and it suffices if the structure of the mounting portion for these lift links 3 has sufficient strength, and it is possible to reduce the number of special constituent members arranged on the upper surface of the mower 4 and simplify the structure. The weight can be reduced. Also, maintenance is easy.

[0005]

1 and 2, a mower 4 is mounted on the front side of a tractor vehicle body 1. Attached to the front part of the vehicle body 1 is a hitch 8 that pivotally mounts a link socket 6 at the base of the lift link 3 so that the link socket 6 can rotate up and down. The bell crank 9 is pivotally supported by a pin 10. Between the bell crank 9 and the link socket 6, a link 11 having a long hole 10 is connected to the bell crank 9, and a pin 12 of the link socket 6 is fitted in the long hole 15 to make the lift cylinder 2 The lift link 3 is moved up and down by expansion and contraction. Reference numeral 13 is a connecting pin that connects the insertion portion between the link socket 6 and the lift link 3.

A grounding wheel 5 is provided at the front ends of such a pair of left and right lift links 3 so that the vertical position can be adjusted and the direction can be freely adjusted, and the grounding wheel 5 is grounded and supported on the cutting ground. Further, the mower 4 is for cutting grass on the lower surface of the mower deck 14 by rotating several blades on a horizontal plane, and is rotated by transmission from the transmission case 16 above the deck 14. A bracket 18 for connecting the pin 17 to the lift link 3 and a guide rod 19 for guiding the rear portion of the bracket 18 so as to be vertically movable are provided on the upper side of the mower deck 14, and the front and rear ends are grounded. Gauge wheels 20 and 2 that keep the cutting height constant
1 is provided.

The grounding wheel 5 allows the support shaft 22 to be vertically adjusted with respect to the boss 23 of the lift link 3, and the lower moving position of the rear guide rod 19 selects the position of the locking pin 25. Thus, by locking the lower limit position of the fixed bracket 24 to the lift link 3, it is possible to change the height difference between the grounding wheel 5 and the mower deck 14 and change and adjust the cutting height.

A power take-off shaft of the vehicle body 1 and an input shaft 29 of the transmission case 16 of the mower 4 can be connected by an interlocking shaft 26 for transmission. Reference numeral 27 denotes an outlet opening to one side of the mower deck 14, which collects grasses under the mower deck 14 to be cut by each blade and discharges them laterally. 28 is a front wheel of the tractor. By the hydraulic expansion and contraction of the lift cylinder 2, the bell crank 9 is rotated, and the lift link 3 can be raised and lowered around the pin 7. At the time of non-mowing, the lift link 3 is raised to bring the grounding wheel 5 and the mower 4 into the non-mowing position. At the time of mowing, the grounding wheel 5 and the gauge wheels 20 and 21 are grounded by lowering the lift link 3. When the mower 4, the lift link 3, etc. move up and down due to unevenness of the cutting ground during the cutting operation, first move up and down within the range of the long hole of the link 11, and when exceeding this range, the hydraulic pressure of the lift cylinder 2 is increased. It can be moved up and down freely by the free flow of the circuit.

When the grounding wheel 5 rides on the convex portion of the mowing ground during the mower work, it is pushed up and the lift link 3 is moved upward. Along with this, the mower deck 14 is also lifted, and even if the gauge wheels 20 and 21 are in contact with the ground, they will float. When only the gauge wheels 20, 21 and the like on the mower deck 14 side are pushed up due to a local change in the cutting ground, the lift link 3 is pushed up through the bracket 18 and the like when the guide rod 19 cannot be absorbed. Becomes

On the upper side of the mower deck 14, in addition to the transmission case 16, a transmission belt is stretched from the input shaft 29 to the rotary shaft of each blade for transmission. A transmission cover is often provided to cover the upper surface. In such a configuration, at the time of maintenance such as belt tension, the number of members on the upper side of the transmission cover is small, so that the transmission cover can be easily attached and detached.

3 to 5 are different from the above example in that
It does not have a front gauge wheel on the mower deck 14. The vehicle body 1 is equipped with a turfgrass-collecting collector 30 that is cut and conveyed from the mower 4. Reference numeral 31 is a cockpit, 32 is a steering wheel, and 33 is a rear wheel. Cockpit 3
A lift lever 34 for controlling the expansion and contraction of the lift cylinder 2 and a lift control valve 35 controlled by the lift lever 34 are provided on the side of 1. Reference numeral 36 is a cylinder hose connecting to the lift cylinder, and 37 is a pump hose connecting to the hydraulic pump.

Lift lever 3 in the lifting control valve 35
4, the spring 38 for returning to the neutral position N is tensioned from the raised position A side toward the neutral position N side, and the lift lever 34
Has a clip plate 40 for partitioning and positioning between the neutral position N and the lowered position B in the free flow state by the partition teeth 39, and the lift lever 34 is provided between the spring 38 and the partition teeth 39. The neutral position N is locked so as to sandwich the clip pin 41.

The elevating control valve 35 is in the form of a rotary which is rotated around the central axis 42 of rotation of the lift lever 34, and is rotated from a neutral position N to a front-rear raising position A and a lowering position B, The hydraulic pressure to the lift cylinder 2 is switched. At the raising position A, the lifting control valve 35 sends hydraulic pressure to the lift cylinder 2 to extend the piston and lift the lift link 3.
Raise. At the neutral position N, the hydraulic pressure supply / discharge of the lift cylinder 2 is stopped, and the piston is not expanded / contracted. or,
At the lowered position B, the hydraulic pressure from the hydraulic pump is not supplied,
Since it is switched to the tank port, the piston can freely expand and contract, and therefore the lift link 3 can be freely moved up and down.

The spring 38 presses the clip pin 41 from the raised position A side, and the other end 48 engages with a locking pin 44 projecting from the valve case 43. Also, clip plate 4
In 0, the base portion is pivotally supported 45 on the valve case 43, and the tip end is tensioned by the clip spring 46 toward the clip pin 41 side.
Partition teeth 39 are provided on the clip pin 41 side of the clip plate 40.
The clip pin 41 can pass over the partition teeth 39 against the tension of the spring 46 as the lift lever 34 is operated. At the lowered position B of the lift lever 34, the clip pin 41 is engaged with the recess 47 formed on the tip side of the partition tooth 39. Also, the neutral position N
The clip pin 41 is on the base side of the partition tooth 39,
It is locked and held so as to be sandwiched between it and the spring 38. At the raised position A, since the guide surface of the clip pin 41 of the clip plate 40 is a smooth surface, there is no locking position, and when the lift lever 34 releases the operating hand, the spring 38 pushes it back to the neutral position N.

As described above, the lift lever 34 may be held in the lowered position B, that is, the elevating control valve 35 to the lift cylinder 2 may be in a free flow state to continue the mower work. The return spring 38 is
Since it works only in the returning direction from the raised position A side, the clip pin 41 is
It is possible to prevent spontaneous return from the lowered position B to the neutral position N side beyond the partition teeth 39, and to maintain a stable operation position.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is a plan view of a main part.

FIG. 2 is a side view thereof.

FIG. 3 is an overall side view showing another embodiment.

FIG. 4 is a side view of a lift control valve operation unit.

FIG. 5 is a front view thereof.

[Explanation of symbols]

 1 vehicle body 2 lift cylinder 3 lift link 4 mower 5 grounding wheel

Claims (1)

[Claims] 1. A tractor mower in which a mower 4 and a ground wheel 5 are separately mounted on a lift link 3 which is lifted and lowered by a lift cylinder 2 with respect to a vehicle body 1.