JPH10164955A - Front mower for tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform the switching operation of the standing posture of a front mower mounted to the front part of a tractor car body. SOLUTION: An input coupling 4 is positioned and provided on a bearing boss 3 at the center part of a mower deck 2 for pivotally disposing several blades 1 and a driving case 11 provided with a driving coupling 10 connectable to the input coupling 4 linked through a free shaft joint 8 and an extension/ contraction shaft 9 from a driving power take-out shaft on the side of a car body 6 on a lower surface capable of being vertically opened, closed and turned as a hinge 5 to the mower deck 2 at the front position or rear position of the input coupling 4 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front mower mounted on a front side of a tractor body so as to be able to move up and down.
The mower deck is in a standing position to facilitate maintenance.

[0002]

When the mower deck of the front mower is switched to the standing posture, the power take-out shaft on the vehicle body side and the interlocking shaft on the mower deck transmission case side must be separated, which makes the operation troublesome. It is.

[0003]

According to the present invention, an input coupling 4 is provided on a bearing boss 3 at a central portion of a mower deck 2 on which several blades 1 are mounted, and a front position of the input coupling 4 is provided. Alternatively, it can be opened and closed as a hinge 5 with respect to the mower deck 2 at a rear position, and can be linked to the input coupling 4 from a power take-out shaft 7 on the vehicle body 6 via a universal joint 8 and a telescopic shaft 9. The tractor has a front mower configuration provided with a drive case 11 having a drive coupling 10 on the lower surface thereof.

[0004]

The drive case 11 is provided on the upper surface of the mower deck 2.
When the drive coupling 10 is moved downward around the hinge 5 to be in the overlapped state, the drive coupling 10 on the lower side of the drive case 11 can be fixed so as to be fitted and connected to the input coupling 4 on the upper surface of the mower deck 2. In this state, the mower deck 2 is moved up and down by the vertical movement of the lift arm with respect to the vehicle body 6, and the drive coupling 10 of the drive case 11 is interlocked with the power take-out shaft 7 via the universal joint 8 and the telescopic shaft 9. Then, the input coupling 4 fitted with the input coupling 4 is driven to transmit the blade 1 to cut grass.

[0005] When the mower deck 2 is in the standing posture,
When the mower deck 2 is lifted by the lift arm with the fixing of the driving case 11 released, the space between the mower deck 2 and the upper driving case 11 is opened around the hinge 5 and rotated as the mower deck 2 is raised. Is done. For this reason, by fixing or releasing the fixing between the mower deck 2 and the drive case 11, the mower deck 2 can be easily switched between the cutting posture and the standing posture, and maintenance can be easily performed. Even in such an upright posture, the telescopic shaft 9 and the like move up and down with the up and down movement of the drive case 11 so that they do not separate from each other. Can be opened, so that maintenance between them can be easily performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tractor body 6 has a four-wheel drive mode in which an engine E is mounted at a rear portion and a rear wheel 13 steered by a front steering wheel 12 and a front wheel 14 can be driven to run. . Reference numeral 15 denotes a cockpit. At the front of the vehicle body 6, a base of a lift arm 17 which is vertically rotated by a hydraulically expandable and contractible lift cylinder 16 is supported by an arm shaft 18. These lift arms 1 are provided rotatably.
The front and rear portions of the mower deck 2 are connected between the front end of the suspension link 7 and the front end of the suspension link 19 and are moved up and down. A power take-off shaft 7 projects from the transmission case 20 at the front end of the vehicle body 6 and is connected to the input shaft 21 of the drive case 11 on the mower deck 2 via the telescopic shaft 9 and the universal joint 8. The respective blades 1 in the mower deck 2 are rotated in conjunction with each other.

The mower deck 2 has blades 1 which are rotatable around a blade shaft 22 in a vertical direction at a central portion and right and left side portions thereof, and collects turf grass cut by each blade 1 to a discharge port 34 on one side. It is a structure to guide and release to the side while making it. An input coupling 4 integrated with the blade shaft 22 is formed integrally with a pulley 23 above the bearing boss 3 that bears the blade shaft 22 at the center of the mower deck 2. A belt is stretched between the pulley 23 and a pulley at the upper end of another blade shaft, and each blade shaft is transmitted by the rotation of the blade shaft 22 at the center.

The drive case 11 on the upper side of the mower deck 2 is
The input shaft 21 is mounted on the rear side, and the input coupling 4 is mounted on the lower side. The input coupling 4 can be fitted and engaged with the drive coupling 10 in opposition. The drive case 11 is attached to a cover 24 that covers the upper side of the mower deck 2. This cover 24
The front end of the mower deck 2 is supported by a hinge 5 so that the front end can be opened upward with respect to the front upper surface of the mower deck 2, and the rear end is configured to be disengaged from the rear end of the mower deck 2 by a lock pin 25. . By removing the lock pin 25, the cover 24 can be turned around the hinge 5 at the front end and opened upward.

The cover 24 has a lift arm 1
The front ends of the suspension link 7 and the suspension link 19 can be connected by pins 26 and 27. The lift arm 17 is connected at the front end of the cover 24, and the suspension link 19 is connected at the rear end. Further, the suspension link 19 can be extended and contracted in the middle part, and the position of the stopper 29 can be moved and adjusted by the pin 28 so that the suspension extension limit can be changed and adjusted. In addition, the space between the lift arm 17 and the lift cylinder 16 is
The lift arm 17 is interlocked so that the lift arm 17 can be turned up and down via a bell crank 30 and a link 31 which pivotally support a part of the lift arm 17.

Reference numeral 32 denotes a gauge wheel provided on the front side of the mower deck 2, and reference numeral 33 denotes a tail wheel provided on the rear side. In the state A in which the cover 24 is locked on the upper surface of the mower deck 2 with the lock pin 25, the mower deck 2 can be moved up and down by expansion and contraction of the lift cylinder 16, and the power take-out shaft 7 and the telescopic shaft 9, the drive coupling 10, the input Due to the engagement of the transmission clutch such as the coupling 4, the blade 1 can be driven to rotate so as to cut grass.

When the mower deck 2 is to be raised, the lock pin 25 fixing the cover 24 is removed and the lift arm 17 is raised by the operation of the lift cylinder 16 in a freely openable / closable state. The tail wheel 33 at the rear end is brought into contact with the ground, and is moved forward. At this time, since the lock pin 25 of the cover 24 is released, the rear end of the cover 24 is
And pivots relative to the mower deck 2 about a hinge 5 at the front end. Thereby, the mower deck 2 can be set in the standing posture B. Further, the telescopic shaft 9 is bent via the universal joint 8, but the connected state is maintained. The suspension link 19 also maintains the connected state. Further, since the connection of the couplings 4 and 10 is released by opening the cover 24, the driving case 1
The opening 1 operates integrally with the cover 24 at a free angle.

In the above example, the hinge 5 is connected to the coupling 4, 1
Although the position is set to a position ahead of 0, the position of the front and rear hinges 5 and the lock pin 25 may be changed. That is, the rear end of the cover 24 may be configured as a hinge for opening and closing with a lock pin 25 and the front end may be configured as a lock pin with a hinge 5 to be switchable between fixed and released. Lift arm 1
When the cover 7 is lifted, the rear end of the mower deck 2 is raised and the gauge wheel 32 is erected in a state where the gauge wheel 32 is in contact with the ground.

In the illustrated example, the lift arm 17 is
Although it is connected to the front end of the cover 24 at 6, it may be configured to be directly connected to the front end of the mower deck 2. FIG.
In FIG. 5, a different point from the above example is that a damper 35 is provided between the mower deck 2 and the drive case 11 so that the relative rotation between the two can be smoothly opened and closed. The pin 27 of the suspension link 19 is configured to also serve as the hinge pin 25. The front hinge pin 5 is fitted into the pin groove of the bracket 36 fixed to the front upper surface of the mower deck 2 from above,
A lock pin 37 in the front-rear direction is inserted above the hinge pin 5, and the hook ring 3
The engaging pin 8 is engaged with the bracket 36 to prevent the hinge pin 5 from being pulled out, and the hinge pin 5 can be attached to and detached from the mower deck 2.

A bracket 39 is fixed to both left and right ends of the hinge pin 5, and a front end of the lift arm 17 is connected to the bracket 39 by a pin 26. One end of the damper 35 is connected to the upper end of an arm 40 integrated with the hinge pin 5 by a pin 41. The lock pin 3
By attaching and detaching the hinge 7, the hinge pin 5 can be attached to and detached from the bracket 36, and the mower deck 2 and the drive case 11 can be opened and closed. Also, a hinge pin 25 serving as a hinge for the opening and closing rotation is provided on a bracket 42 fixed to the mower deck 2.
, A lock pin 43, a hook ring 44, and the like, so that the hinge pin 5 has the same configuration as that of the hinge pin 5 and is detachable. Reference numeral 45 denotes a regulating rod provided between the hinge pin 25 and the pin on the side of the vehicle body 6, which has a long hole 46 and moves up and down to lock the lower limit position of the rear portion of the mower deck 2.

A cover 24 for mounting the drive case 11
Is provided at the center of the mower deck 2 in the width direction,
The left and right side covers 47 may be integrally formed with the side covers 47, or may be separately opened and closed or detached independently. 6 and 7, the difference from the above example is that the front hinge pin 5 is fitted into the long hole 49 of the bracket 36 in the vertical direction, and the vertical movement C is performed by the rotation of the lift arm 17. The upper limit position of the hinge pin 5 is changed up and down by replacing the upper and lower pin holes 50 and 51 with the lock pin 37. When the lock pin 37 is inserted into the lower pin hole 51, the vertical movement of the hinge pin 5 with respect to the mower deck 2 hardly occurs, and the drive coupling 10 remains engaged with the input coupling 4 and the blade 1
Can be linked with rotation. Also, when the lock pin 37 is replaced with the upper pin hole 50, the hinge pin 5 can move up and down the long hole 49, and when the lift arm 17 is lowered to the mowing work position, the hinge pin 5 is positioned at the lower end of the long hole 49. Then, as described above, the couplings 10 and 4 are engaged and the blade 1
However, when the lift arm 17 is raised to the non-cutting position, the hinge pin 5 moves up the long hole 49 and is locked by the lock pin 37, so that the mower deck 2 and the drive case 11 The gap is widened, the bite between the upper and lower couplings 10 and 4 is disengaged, and the blade 1 cannot be driven and rotated, and safety during non-cutting is achieved. Reference numeral 48 denotes a hairpin for preventing the lock pin 37 from coming off.

[Brief description of the drawings]

FIG. 1 is a side view showing the operation of a front mower.

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

FIG. 3 is an overall arrangement side view.

FIG. 4 is a perspective view of a mower deck showing a partially different embodiment.

FIG. 5 is a side view of a part thereof.

FIG. 6 is a side view of a mower deck showing another embodiment.

FIG. 7 is a perspective view of a part thereof.

[Explanation of symbols]

 Reference Signs List 1 blade 2 mower deck 3 boss 4 input coupling 5 hinge 6 vehicle body 7 power take-out shaft 8 universal shaft joint 9 telescopic shaft 10 drive coupling 11 drive case

Claims (1)

[Claims] 1. An input coupling 4 is provided on a bearing boss 3 at the center of a mower deck 2 on which a plurality of blades 1 are axially mounted, and a hinge for the mower deck 2 at a front position or a rear position of the input coupling 4 is provided. A drive coupling 10 which can be opened and closed and rotated up and down and can be connected to the input coupling 4 by being interlocked with a power take-out shaft 7 on the vehicle body 6 side via a universal joint 8 and a telescopic shaft 9. A front mower of a tractor provided with a drive case 11 provided in the vehicle.