JPH0584009A - Hanger for tractor mower - Google Patents

Abstract

PURPOSE:To restrict a lowering limit position in vertical movement of a mower deck by installing a specific hanging height regulator between a mower deck and a lifting arm. CONSTITUTION:The rear end side of a mower deck 4 is hung from a lifting link 3 so as to enable vertical free movement. A hanging height regulator 5 is provided between the mower deck and a lifting arm 2 to absorb and engage the mower deck rocking and lifting over the vertical free movement region with the lifting arm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower suspension device which is attached to a lift link of a tractor body for suspension to mow grass.

[0002]

2. Description of the Related Art In a tractor mower, a mower deck is provided on a lift link so that the mower deck can freely move up and down within a certain range so as to absorb vertical swings due to changes in unevenness of the cutting ground. However, when the unevenness is large and it swings up and down over a certain area, the lift link that mounts the mower deck is pushed up, and it is impossible to attach the lift link and the vehicle body. It may be damaged by excessive force.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the rear end side of a mower deck 4 is suspended by a lift link 3 which is lifted and lowered by a lift arm 2 relative to a tractor vehicle body 1. The suspension height adjusting device 5 is provided between the lift arm 2 and the lift arm 2 to absorb and lock the upward movement of the mower deck 4 beyond the vertical floating area.

[0004]

[Advantageous Effects and Effects of the Invention] The lift link 3 is moved up and down by the rotation of the lift arm 2, and when the lawn grass is mowed, the lift link 3 is lowered to bring the gauge wheel portion of the mower deck 4 into contact with the ground or the ground. Mow with the condition left. When the vertical movement of the mower deck 4 exceeds a certain area due to the unevenness of the mowing ground, the suspension height adjusting device 5 operates to raise the suspension height of the mower deck 4 with respect to the lift arm 2. Then, the lower limit position due to the vertical movement of the mower deck 4 is increased. Therefore, the descending area when the mower deck 4 descends in the concave portion of the mowing ground is made small.

As described above, when the mower deck 4 is on a rough uneven ground, etc., the hanging height adjusting device 5 absorbs and locks the mower deck 4, which swings and rises beyond the vertical floating region, to the lift arm 2 and then descends. Since the limit position is limited, the rise of the mower deck 4 can be sufficiently absorbed, and it is possible to prevent the mower deck 4 itself from exerting a strong push-up force on the lift link 3, the lift arm 2, and the like. The descent height is also reduced to 4
The impact force due to the vertical movement of can be reduced.

[0006]

1 and 2, a bracket 6 mounted on the front side of a tractor vehicle body 1 has a lift cylinder 7 which is hydraulically controlled to expand and contract, and a lift arm which is vertically rotated around a support shaft 8 by the lift cylinder 7. 2, and a lift link 3 and the like which are connected to the lift arm 2 by a rod 10 having an elongated hole 9 and a pin 11 fitted to the rod 10 and which is vertically rotatable around a support shaft 12 and the like. By the expansion and contraction of the lift cylinder 7, the lift link 3 is moved up and down via the lift arm 2 and the rod 10.

The mower deck 4 has a structure in which a blade 14 is vertically mounted on a blade shaft 13 so as to be mounted on the blade shaft 13 so as to guide turf grass to be cut through a grass collecting path 15 to a discharge port 16 on one side. On the center of the mower deck 4, there are provided an input shaft 17 and a transmission case 18 which are interlocked with the power take-off shaft on the vehicle body side, so that the blade shaft 13 can be directly transmitted and the remaining blade shaft 13 can be transmitted by the belt. To be done. Brackets 19 and 20 are arranged on the upper surface of the mower deck 4 to connect the lift link 3 and the link 21 having the long hole 23. With respect to the pivotally attached portion 22 of the lift link 3 to the bracket 19, the bracket 20 of the link 21
Pivot 32 to is located at the rear of this link 2
One end of the seesaw link 24 is connected to the long hole 23 of the first connecting pin 25.
It is fitted and connected with.

The intermediate portion of the seesaw link 24 constituting the suspension height adjusting device 5 is pivotally supported 26 on the lower end portion of the lift arm 2 so as to be swingable, and a rack 27 is formed at the tip end side of the lift arm 2. The lift arm 2 of the seesaw link 24 is formed by pivotally supporting the lift arm 2 of the seesaw link 24 by pivotally supporting the lever 27 on the rack 28 and engaging a locking piece 30 elastically downward by a spring 29 with the rack 27.
The angle with respect to is engaged and fixed, and the height of the mower deck 4 can be automatically raised and held by being pushed up from the ground. A gauge wheel 31 is provided at the rear end of the mower deck 4.

When the mower deck 4 is pushed up due to the unevenness of the mowing ground at the time of mowing by the mower, the mower deck 4 is swung in the range of the elongated hole 23 of the link 21. This swing range is the height of the elongated hole 21. When it goes over, the connecting pin 25 is pushed up, the link 24 is swung around the pivot 26,
The engagement position of the locking piece 30 with respect to the rack 27 approaches the vicinity of the pivot portion 26, and the hanging position of the mower deck 4 by the connecting pin 25 is raised.

3 and 4 are different from the above example in that
The seesaw link 24 is swung around the pivot portion 26 by the operation of the grip portion 32, and the clip ball 33 (or clip pin) on the seesaw link 24 is fitted into the clip hole 34 of the lift arm 2. By changing the angle of the seesaw link 24, the lower limit position of the mower deck 4 can be manually operated. When the mower deck 4 is pushed up beyond the range of the long hole 23, the engaged clip ball 33
Is moved to the lower clip hole 34. This engagement is set so as not to be disengaged when the mower deck 4 is automatically or vibrated.

5 and 6 are different from the above example in that
In front of the vehicle body 1, a support link 3 that absorbs upward movement with a damper 35 and grounds and supports with a pair of left and right ground wheels 36
7 is provided, and the mower deck 4 is suspended on the support link 37 by the rod 38. When the ground wheel 36 is moved upward, the support link 37 is received by the damper 35 with respect to the vehicle body 1. Therefore, the forward movement of the tractor body 1 is suddenly braked, and the front wheels 3
Around the axle 40 of No. 9, the forward direction force of the vehicle body, which the rear wheel side tries to float, is supported by the grounding wheel 36 so that it does not act on the mower deck 4. 41 is a support link 37
Of the upper and lower grounding wheels 3 by means of the caster shaft of the grounding wheel 36 with respect to the support link 37, which is pivotally attached to the traveling transmission case of the vehicle body 1 side.
The position of 6 is adjustable. The damper 35 is provided between the vehicle body 1 and the support link 37.

In the mower deck 4, the spring 43 is elastically urged downward with respect to the support link 37, regardless of the ground wheel 36.
The gauge wheel 31 is grounded to the cutting ground to maintain a constant cutting height. Reference numeral 44 denotes a clutch lever of the PTO clutch, which is used to connect the vehicle body 1 to the input shaft 1 on the mower deck 4.
7 is interlocked, and by operating this clutch lever 44 from the transmission OFF position OFF to the ON position ON, the arm 4 on the mower deck 4 via the wire 45.
The mower deck 4 is levitated above the cutting ground by pulling up 6 and pulling up the rod 38 against the spring 43. Therefore, when traveling on the road, the ground wheel 36 can be grounded and the gauge wheel 31 can be traveled without being grounded. A guide rod 47 suspends the rear portion of the mower deck 4 from the lift link 3. Although the mower deck 4 can be moved freely, the lower limit position can be adjusted by inserting and removing the pin 48.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is a side view of a portion of a tractor mower.

FIG. 2 is a plan view of a part thereof.

FIG. 3 is a partial side view showing another embodiment.

FIG. 4 is a perspective view of a part thereof.

FIG. 5 is a partial side view showing another embodiment.

FIG. 6 is a perspective view of a part thereof.

[Explanation of symbols]

 1 vehicle body 2 lift arm 3 lift link 4 mower deck 5 suspension height adjusting device

Claims (1)

[Claims] 1. A lift arm 2 with respect to a tractor body 1.
The rear end portion side of the mower deck 4 is movably hung up and down on the lift link 3 which is lifted up and down, and between the mower deck 4 and the lift arm 2, the upward movement of the mower deck 4 beyond the vertical movement region is lifted. A tractor mower suspension device provided with a suspension height adjusting device 5 that absorbs and locks.