JPH0460602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mower that is attached to a traveling vehicle and performs grass cutting work.

(Prior art) A mower attached to the midsection or front of a running vehicle has ground wheels on both left and right sides of the front of the mower deck that can set the cutting height, and the mower can be operated with the rear side of the mower deck in a suspended state. do.

This mower moves up and down to follow the unevenness of the ground, and to prevent the blades from scraping the soil, limit gauge wheels are provided at the front center of the outer periphery of the mower deck and on the left and right sides of the rear surface, and limit gauge wheels are also installed at the center of the inner rear of the mower deck. A limit gauge ring is provided.

(Problems to be Solved by the Invention) In the conventional mower, one rear central limit gauge wheel is disposed behind the central blade of the triangularly arranged blades, and the distance between it and the central blade is short; The distance between the left and right blades is longer. As a result, the left and right blades may scrape or the cutting heights may become uneven.

(Means for Solving the Problems) The present invention provides two limit gauge wheels 29A, 29B at the rear of the mower deck 7, and sets the limit gauge wheels 29A, 29B to the distance LA to the central blade axis and the left and right blades. Distance to axis
LB, LC are approximately equal and each blade 10A, 10
By arranging it at a position close to B and 10C, the problems of the prior art described above can be solved.

That is, the specific configuration of the problem solving means in the present invention is that the central blade 10A and the left and right blades 10 on the rear side thereof are installed in the cutting space 8 in the mower deck 7.
B, 10C are arranged so as to be rotatable around the vertical axis, three sides of the cutting space 8 are closed with side walls to form a grass clippings outlet 9 on one side, and a grass cutting outlet 9 is provided at the back of the cutting space 8 approximately along the central blade 10A. A central wind guide portion 24A forming a curved arc surface 23A, and each left and right blade 10B, 10C.
Left and right wind guide portions 24B, 24C formed with arcuate surfaces 23B, 23C substantially along
In a mower provided with left and right chevron portions 25A and 25B formed in a forward-protruding shape to connect the left and right chevron portions 24B and 24C, distances LB and LC to the respective left and right blade axes are located behind the left and right chevron portions 25A and 25B. Limit gauge wheels 29A, 29B are provided at positions approximately equal to the distance LA to the central blade axis and close to each wind guide portion 24A, 24B, 24C.

(Function) The left limit gauge wheel 29A is arranged at a position where the distance LA to the central blade axis and the distance LB to the left blade axis are approximately equal and close to both blades 10A and 10B.
To limit height simultaneously and at the most effective position. Similarly, for the right limit gauge wheel 29B, the distances LA and LC between the central blade axis and the right blade axis are approximately equal, and both blades 10A and 1
Close to 0C, both blades 10A, 10C
To simultaneously and most effectively limit the height of the object.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In Figures 1 to 4, reference numeral 1 denotes a mid-mounted mower that is attached to the tractor body 2 via an attachment mechanism 3 so as to be able to rise and fall freely.The mower 1 is located between the front wheels 4 and the rear wheels 5 and follows the unevenness of the ground. while driving.

The mower deck 7 of the mower 1 forms a reaping space 8 whose lower and right sides are open.
The periphery of the blade except for the right grass discharge outlet 9 is closed by a side wall, and a central blade 10A and left and right blades 10B and 10C are arranged within the space.

A gear case 11 is provided at the center of the mower deck 7 in the left and right direction, and the input shaft 1 of this gear case 11
2 is connected to a power output shaft of the tractor body 2 via a universal joint shaft 13, and the output shaft is a central vertical shaft 14A, at the bottom of which a central blade 10A is attached.

Left and right vertical shafts 14B and 14C are rotatably supported on the left and right rear sides of the central vertical shaft 14A of the mower deck 7, and left and right blades 10B and 10C are attached to the lower portions of the left and right vertical shafts 14B and 14C, respectively.
Pulleys 15A, 15B, 15C are provided on the three vertical shafts 14A, 14B, 14C, and a belt 16 is wound around all the pulleys 15A, 15B, 15C, and tension is applied by a tension means 17. Therefore, the power of the input shaft 12 can be transmitted to the three vertical shafts 14A, 14B, and 14C.

The pulley 15, belt 16, tension means 17, etc. are surrounded by a transmission cover 18 provided on the upper surface of the mower deck 7.

Ground wheels 19 that can adjust the cutting height are provided on both left and right sides of the front part of the mower deck 7, and limit gauge wheels 20A, 20B, and 20C that limit the height are provided in the center of the front part and on both left and right sides of the rear part. ing.

At the back of the reaping space 8 in the mower deck 7, there is a central wind guide section 24A having an arcuate surface 23A approximately along the rotation locus of the outer end of the central blade 10A.
, left and right wind guide portions 24B, 24C forming arcuate surfaces 23B, 23C approximately along the rotation locus of the outer ends of the left and right blades 10B, 10C, and a central arcuate surface 23.
Left and right chevron-shaped portions 25A, 25 are formed in a forward protruding shape to connect the respective wind guide portions 24A, 24B, 24C in order to connect the left and right arcuate surfaces 23B, 23C with A.
B is provided.

The three wind guide parts 24 and the two chevron parts 25 are integrally formed by bending one band plate,
It constitutes a rear guide plate 26 of the reaping space 8. The rear guide plate 26 is formed separately from the mower deck 7, and the left and right wind guide portions 26 are formed on the back wall 27 of the mower deck 7.
4B and 24C, or by using the rear guide plate 26 itself as a mower deck back wall, the left and right wind guide parts 24
A separately formed reinforcing plate is welded between B and 24C.

A rear space 28 is formed between the rear wall 27 formed by the peripheral wall or reinforcing plate of the mower deck 7 itself and the rear guide plate 26 because the central blade 10A is located ahead of the left and right blades 10B and 10C. In this rear space 28, two central limit gauge wheels 29A and 29B are arranged.

Two central limit gauge wheels 29A, 29B
is the widest chevron portion 25A, 2 in the rear space 28.
5B, each blade 10A, 10
It is placed close to B and 10C. That is, the distance between the center left limit gauge wheel 29A and the vertical axis 14A is
The distance LB from LA to the vertical axis 14B is approximately equal, and is close to the wind guide portions 24A and 24B at the same time,
The middle right limit gauge wheel 29B has a distance LA to the vertical axis 14A and a distance LC to the vertical axis 14C which are approximately equal, and is also close to the wind guide portions 24A and 24C at the same time.

Each limit gauge wheel 29 has two support plates 30.
A, 30B is supported via a shaft 31, and 2
The two support plates 30A and 30B are welded to the back wall 27 and the rear guide plate 26, and the front end of one support plate 30A is welded to the chevron portion 25 to improve the strength of the chevron portion 25, and the other support plate 30A is welded to the chevron portion 25. The support plate 30B reinforces the central wind guide section 24A.

Distance LD from the central vertical axis 14A to the central front limit gauge wheel 20A, left and right vertical axes 14B, 1
From 4C to ground wheels 19A, 19B and rear gauge wheel 2
The distances LE, LF, LG, and LH to 0B and 20C are
Preferably, the distances LB and LC from the left and right vertical axes 14B and 14C to the central limit gauge wheels 29A and 29B are approximately equal.

In this way, if the distances L from the axis of each blade to the limit gauge wheels 29A, 29B, 20A, 20B, 20C and the ground wheels 19, 19 are made approximately equal, the mowing height by each blade 10A, 10B, 10C will be approximately uniform. , mowing performance is improved. Further, by placing the limit gauge wheel and the grounding wheel closer to each blade 10A, 10B, and 10C, the minimum height of the blade can be restricted even if there are small irregularities on the ground, thereby further preventing earth scraping.

The center rear limit gauge wheels 29A, 29B can be attached to the back of the back wall 27, but it is possible to attach them to the rear of the chevron portions 25A, 25B that protrude forward.
Center blade 10A and left and right blades 10B, 1
It can be brought closer to 0C and the height can be more effectively restricted.

FIG. 5 shows an example of a front mount mower 34 to which the present invention can be applied. It is installed.

The internal structure of the mower 34 is substantially the same as that of the mid-mount mower 1 shown in FIGS. 1 to 4, and differs only in the arrangement of the left ground contact wheel 19L.

Trajectory 39 shows vehicle 3 running with rear wheels 36 turned to the maximum.
This is the turning trajectory of the left end of the mower deck 7 when the vehicle 38 is turned with the minimum radius.When turning the traveling vehicle 38 in reverse, the operator must be careful not to let the left end of the mower deck, which is the outermost part, collide with obstacles such as trees. Maneuver while under the cover.

Conventionally, the left ground wheel 19L was located at the left end of the mower deck 7, so it sometimes passed radially outward from the trajectory 39 and collided with a tree or the like.

In FIG. 5, the left ground wheel 19L is displaced toward the center of the front part of the mower deck 7, so that it passes radially inward from the locus 39. This prevents damage to the left ground contact wheel 19L and eliminates the need to provide a reinforcing member or a protective member.

(Effects of the Invention) According to the present invention detailed above, the mower deck 7
Behind the left and right chevron portions 25A and 25B of the rear guide plate 26 forming the rear part of the reaping space 8 of Since the limit gauge wheels 29A, 29B are arranged, and these left and right limit gauge wheels 29A, 29B are located close to each wind guide section 24A, 24B, 24C,
The three blades 10A, 10B, 10C and the two limit gauge wheels 29A, 29B can prevent earth scraping under substantially the same conditions, and can effectively prevent earth scraping, reducing the mowing height to approximately It becomes possible to improve mowing performance by making it uniform.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a rear view, FIG. 3 is a cross-sectional plan view of the main part, and FIG. 4 is a cross-sectional side view of the main part. FIG. 5 is a plan view showing an example of the arrangement of the grounding wheels of the front mount mower. 1... Midmount mower, 7... Mower deck, 8... Reaping space, 9... Clipped grass discharge port, 10
...Blade, 19...Grounding wheel, 20...Limit gauge ring, 23...Circular surface, 24...Wind guide section, 25...Chevron section, 26...Rear guide plate, 29...
...Limit gauge wheel, 30...Support plate.

Claims (1)

[Claims] 1. A central blade 10A and left and right blades 10 on the rear side of the central blade 10A in the reaping space 8 in the mower deck 7.
B, 10C are arranged so as to be rotatable around the vertical axis, three sides of the cutting space 8 are closed with side walls to form a grass clippings outlet 9 on one side, and a grass cutting outlet 9 is provided at the back of the cutting space 8 approximately along the central blade 10A. A central wind guide section 24A that has a curved arcuate surface 23A, a left and right guide section 24B, 24C that has arcuate surfaces 23B, 23C that roughly follow the left and right blades 10B, 10C, and each wind guide section 24A, 24.
In a mower provided with left and right chevron portions 25A and 25B formed in a forward protruding shape to connect the left and right chevron portions 25A and 24C, distances LB and LC to the respective left and right blade axes are located behind the left and right chevron portions 25A and 25B. A mower characterized in that limit gauge wheels 29A, 29B are provided at positions approximately equal to the distance LA to the center blade axis and close to each wind guide section 24A, 24B, 24C.