JPH0479808A - Tractor mower - Google Patents

Abstract

PURPOSE:To provide the subject device preventing the non-mowing of grass by disposing a mower section on the front side of a body of the tractor mower in such a state that the extended widths of the mowing outward projected from front wheels are larger on the inside of the revolution of the mower and smaller on the outside of the revolution, respectively, and in such a state that the inside and outside extended widths are placed at rear and front positions, respectively, to form an inclination in the lateral direction. CONSTITUTION:In a tractor mower for mowing grass where a tractor body 3 is driven with front wheels 1 and steered with rear wheels 2, a mower section 4 is disposed on the front side of the tractor body 3, the mower section 4 having mowing blades 19 rotated with vertically disposed mowing shafts 18 under a mower deck 17 in the lateral direction. When the tractor mower travels straight, the mowing width of the mower section 4 is larger than the width of the width of the front wheels 1 because the mowing width of the mower section 4 is extended over both the sides of the front wheels 1. When the tractor mower is revolved, the extended mowing width A of the mower section 4 on the inner side of the revolution is larger than the mowing width B of the mower section 4 on the reverse side to form an inclination C in the lateral direction.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a tractor mower that is attached to a tractor to cut lawn grass, and is intended to eliminate uncut mowing caused by the mower when the tractor turns and steers. be.

(Prior Art and Problems to be Solved by the Invention) A tractor mower in which the steering axle of a four-wheeled tractor body is the rear wheel, and a mower is attached to the front side of the vehicle body to cut grass. It is possible to turn by reducing the turning radius of the wheel on the mower side, but the reaping turning radius of the mower that is mounted protruding forward varies depending on the support position of the mower that protrudes forward from the front wheel, and The further the mower moves forward, the larger the reaping turning radius becomes. Therefore, the present invention attempts to reduce the amount of grass left unmoved when turning by installing a mower in advance with respect to the vehicle body and being deviated to the inside of the turn.

(Means for Solving the Problems) This invention provides a reaping overhang width that protrudes outward beyond the front wheels 1 on the front side of a vehicle body 3 that drives the front wheels 1 and runs by steering the rear wheels 2. , the tractor mower has a configuration in which the mower 4 is installed in a state where it is tilted C with respect to the lateral direction, and the length < A on the inside of the travel turn and the rear position, and the short B and the front position on the outside. .

(Operation and Effects of the Invention) A mower 4 is mounted in front of the front wheels 1 of the tractor body 3, and lawn grass is cut while moving forward by steering the rear wheels 2. When traveling straight, the mowing width of the mower 4 is extended to the left and right outside of the front wheels 1, so the mower 4
The reaping width is wider than the width of the front wheels 1, and the reaping overhang width A of the mower 4 on the inside of the turn when turning is wider than the reaping overhang width B on the opposite side. The cutting width is different between the left and right sides.

When mowing lawn grass while turning in the direction of travel of the tractor body 3, the tractor body 3 moves forward while turning by steering the rear wheels 2 to perform the cutting. This turning direction is set to one of the left and right directions, and on the inside of this turning, the reaping overhang width A is set to be deviated to a larger extent than the reaping overhang width B on the opposite side, Moreover, the mower 4 is tilted left and right as the inside of this turn approaches the front wheel 1 side relative to the outside.
Therefore, the inner side A and the outer side B of the reaping overhang of the mower 4 are made closer to the turning radius of the front wheel 1, and the inside reaping overhang width A is smaller than the inside front wheel. The outside reaping extension width B is located further inside than the turning position of the outer front wheels l, and the outer reaping extension width B is the turning width area of the left and right front wheels 1. will be reaped.

In this way, the reaping trip height width of the mower 4 is set so that the inside A of the turning travel is set larger than the outside B, and this mower 4
The mower 4 is installed in a state where it is tilted back and forth in the width direction C, and the inside A is closer to the front wheel 1 side than the outside B, so the amount of deviation of the mower 4 from the vehicle body 3 or the wheels 1 is small. Even if the mower 4 is moved, it is possible to eliminate or reduce the remaining width, and there is no need to control the movement of the mower 4 in the left-right direction, front-rear direction, etc. in conjunction with turning, and even if it is moved, the amount of movement can be reduced. This makes it possible to cut grass while maintaining horizontal balance.

(Example) In FIGS. 1 to 3, the tractor body 3 is shown.

The vehicle can travel by driving the front wheels 1 in a four-wheel running mode having a front wheel 1 and a rear wheel 2 that can be freely steered. The transmission of the front wheels 1 includes a differential device, a steering brake, a differential lock device for fixing the differential of the differential device, and the like. 5 is left and right front wheels 1
This is the front wheel to which it is attached. The rear wheel 2 is provided with a rear wheel bracket 7 that can freely rotate around an axis 6 in the vertical direction with respect to the rear part of the vehicle body 3, and a rear wheel housing that can freely roll around a center pivot axis 8 with respect to the rear wheel bracket 7. A rear wheel 2 is provided at both ends of the rear wheel housing 9.
is mounted on a shaft, and is provided so as to be freely steerable with respect to the rear wheel housing 9 by means of a knuckle arm 10. A tie rod 11 connects the left and right knuckle arms 10.

A steering cylinder 12 is provided between one side of the vehicle body 3 and both left and right sides of the rear wheel housing 9, and the steering cylinder 12 is controlled to expand and contract by hydraulic pressure. A steering cylinder 13 that is controlled to expand and contract by hydraulic pressure is provided between a cylinder bracket 14 that projects forward from the housing 9 and the knuckle arm 10 on this side, and is configured to control the steering rotation of the steering handle on the vehicle body 3. The steering control valve in the hydraulic circuit 15 of the steering cylinder 13 is actuated by the movement of the steering cylinder 13, so that the steering can be linked. When the turning radius is further reduced so as to turn around the base of the plant, the steering control valve in the hydraulic circuit 16 of the steering cylinder 12 is also actuated by switching the turning reaping control mode of the controller. The configuration is such that the two systems are linked to each other.

The mower 4 is configured such that a plurality of cutting blades 19 are horizontally arranged below a mower 17 and are rotated by a vertical cutting blade shaft 18, so as to achieve a predetermined cutting width. A collection passage 20 is formed along the front side of the lawn mower 17 for laterally collecting and guiding cut grass, and a discharge port 2 on the negative side is formed.
The structure is such that the gas is discharged from 1 in the horizontal direction.

Such a mower 17 is connected to a pair of left and right connecting links 2.
2 is suspended from the front end of the vehicle body 3, and is raised and lowered relative to the vehicle body 3 using a separate lift arm or the like. An input shaft 23 protruding from the rear of the mower 17 can be connected and interlocked with a power take-off shaft 24 at the front of the vehicle body 3.

The total cutting width between the outer rotating edges of the cutting blades due to the rotation of the cutting blade 19 of the mower 17 is set wider than the wheel width between the outer edges of the left and right front wheels 1.

The reaping width of the reaping width outwardly relative to the left and right front wheels 1 is set such that it is wide on the - side A and narrower on the other side B than on this one side A. The cutting width direction line F connecting the rear ends of the rotation loci D and E of the two cutting blades 19 is tilted back and forth at an appropriate angle C with respect to the direction of the front wheels 5 of the front wheels 1 in plan view. .

Also, the positions of the gauge wheels 25, 26, 27, and 28 attached to the lower side of the mower 17 are such that the front and rear gauge wheels 25, 27 are opposite to the reaping extension width A that is extended outward from the front wheel 1. The front and rear gauge wheels 26 and 28 on the opposite side are provided facing each other within the rotation width of the front wheel 1 on this side.

When reaping is performed while the tractor is running while turning, the mower 17 is turned so that the outlet 21 faces the outside of the turning radius. Narrow width side B
, and the opposite side is the wide side A. Also, in the cutting width direction line F, the discharge port 21 side is away from the front wheel 1 toward the front, and the opposite side is close to the front wheel 1.

While driving the tractor body 3 forward, the rear wheels 2 are steered to bring the gauge wheels 25, 26, 27, and 28 of the front-mounted mower 4 close together to perform reaping work.

When the input shaft 23 is driven from the power output shaft 24, each cutting blade 19 of the mower 17 is rotated to cut the grass at a constant height.

The cut grass is guided through the collection passage 20 toward the discharge port 21 and discharged outside the machine.

Reaping work can also be performed while turning, and when mowing grass around the base of a tree, the turning center position is set approximately on the extension line of the front wheels 5 by steering the rear wheels 2. , not only steering turning by the steering cylinder 13 but also front wheel housing 9 by the steering cylinder 12.
By synchronizing the steering, it is possible to make a turn with a smaller radius, which reduces the area of grass that remains unmoved around the base of the tree.

During reaping traveling by turning, the mower 4 has the side A with a wider reaping overhang on the center side of the turn. Since the rear gauge wheel 27 on the side is located outside the front wheel 1, the rear end of the mower 17 is connected to the front wheel 1.
It can be installed as close to the side as possible. Therefore, by mounting the mower 17 offset to the vehicle body 3, the weight of the side A with the wide reaping overhang increases and the weight of the side B with the narrow side B increases.
However, the weight increase caused by moving further forward than the front wheels 1 is balanced out, and the left and right weight balance with respect to the vehicle body 3 is maintained.

4 and 5, the difference from the upper side is that the mower 4 is controlled to move toward the turning side when turning, and the front ends of the left and right connecting links 22 have pins 29 inserted and removed to adjust the length back and forth. Adjustable link arms 30, 31 are provided, and the link arms 30, 31 are horizontally rotatable around vertical axes 32, 33, and have different lengths, with the link arm 30 on the pivot center side being shorter; The outer link arm 31 is set long. The shorter link arm 30 is rotated left and right by a cylinder 34 that extends and contracts with hydraulic pressure relative to the connecting link 22 at the base. The front ends of these link arms 30, 31 are connected to gauge wheels 25, 26, 27, 2 which are fixed to the mower 17 facing forward.
It is pivotally connected to wheel arms 35 and 36 equipped with 8 etc. by vertical shafts 37 and 38. Expansion and contraction control of the cylinder 34 is performed by a steering operation using the steering handle and a turning reaping control mode of the controller. When the link arm 3o is rotated, the mower 17 is moved in the same direction, and the link arm on the opposite side is moved. 31 also follows and rotates to support this movement.

Further, the power output shaft 24 and the input shaft 23 are interlocked by a universal joint 39, a spline telescopic shaft 40, and the like.

Reference numeral 41 denotes a lift arm provided on the vehicle body 3 side, which connects the left and right connecting links 22 so as to lift them, and lifts the mower 4 to a non-working position by means of a lift cylinder 42 that expands and contracts with hydraulic pressure. descend into position.

In this way, the mower 17 is connected to the link arm 3.
By moving the vehicle body 3 toward the turning side by a rotation of 0.31, the inner circumferential radius of the reaping area of the mower 4 becomes even smaller, and the amount of uncut material can be further reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partial plan view, Fig. 2 is a side view thereof, Fig. 3 is a partially cutaway plan view, and Fig. 4 is a partially separated embodiment. FIG. 5 is a plan view showing the operation. (Explanation of symbols) 1 Front wheel 2 Rear wheel 3 Vehicle body 4 Mower

Claims (1)

[Claims] On the front side of the vehicle body 3, which runs by driving the front wheels 1 and steering the rear wheels 2, the width of the reaping overhang that protrudes outward from the front wheels 1 is made longer A on the inside of the travel turn, so that it is rearward. , a tractor mower in which the mower 4 is mounted in a state where the outside is short B and the mower 4 is inclined in the lateral direction with the front position being inclined C.