JP2003230311A - Riding lawn mower - Google Patents

Abstract

(57) [Summary] An object of the present invention is to obtain an apparatus which does not require a manufacturing cost and can easily cope with a change of a wheel base. A riding lawn mower in which a mower deck (27) for covering a cutting blade (30) is attached to a lower part of a running body having a front wheel (3) and a rear wheel (4) so as to be able to ascend and descend is provided. , The rear end mounting position of the power steering hydraulic cylinder 48 is changed to the front and rear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding lawnmower for cutting grass and lawn.

[0002]

2. Description of the Related Art It is known that three cutting blades are rotatably provided in a mower deck, and the mower deck is attached to the lower part of the abdomen of a machine so as to be able to move up and down so that grass and weeds can be cut. In general, such lawnmower usually discharges the cut grass from the grass outlet formed on the right end of the mower deck, or collects it at a collector at the rear of the vehicle body through a cylindrical shooter connected to the grass outlet. is there.

[0003]

By the way, in such a conventional apparatus, when the mower deck is attached to the lower part of the abdomen of the body, it may be necessary to change the size of the mower deck according to the cutting width. In that case, If the front and rear length of the mower deck is too large due to the restriction of the wheel base between the front and rear wheels, the mower deck may not be cured in the lower abdomen of the aircraft.
The efficiency of mowing work sometimes decreased due to the inability to install a size-up mower deck.

[0004]

According to the present invention, a riding lawn mower capable of obtaining the shortest wheel bases for mowers having different cutting widths and greatly improving the work efficiency by mounting a larger mid mower. Therefore, the following technical measures have been taken.

That is, according to the invention of claim 1, the front wheel 3 and the rear wheel 4 are provided.
In a riding lawn mower in which a mower deck 27 that covers the cutting blade 30 is attached to the lower abdomen of a traveling vehicle equipped with, so that the front axle 11 supporting the front wheels 3 is swingably supported about a shaft 50 along the longitudinal direction. And the front axle 11 is provided so as to be reversible in the front-rear direction.

Further, in claim 2, the wheel base of the front and rear wheels 3, 4 can be changed by reversing the front axle 11 back and forth. And Further, in claim 3, the knuckle arm 52 for rotating the front wheel 3 about the vertical axis is connected to the front end of the power steering hydraulic cylinder 48 attached to one of the left and right side portions of the machine body. The riding lawnmower according to claim 1, wherein the rear end mounting position of the power steering hydraulic cylinder 48 can be changed back and forth in accordance with the reversal.

The operation of the above configuration is as follows. When the power of the engine 6 is transmitted to the rotating parts to drive the cutting blade 30 to rotate, the cutting blade 30 that is rotated cuts grass and grass, and the cut grass is discharged from the discharge port of the mower deck 27 to the outside of the mower deck 27. Alternatively, it is collected in the collector 40 mounted on the rear part of the machine body.

When the size of the mower deck 27 is increased by one, for example, from 48-inch mower to 54-inch mower, the front wheel 3 is positioned farther from the rear wheel 4, in other words, the wheel base of the front and rear wheels 3 and 4. The front axle 11 so that it becomes longer,
Then, in this state in which the knuckle arm 52 of the front wheel 3 and the front end of the piston rod 53 of the power steering hydraulic cylinder 48 are connected to each other, in the lower abdomen of the machine, from the side,
The 4-inch mower deck 27 is made to slip into the mower deck 27, and the lifting link 25 and the universal joint 31 are attached to the mower deck 27.
Attach the kind.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. First, the structure will be described. 1 is a riding lawn mower, and a front wheel 3 and a rear wheel 4 are provided at a front portion and a rear portion of a traveling vehicle body 2, respectively.
The engine 6 is installed in the bonnet 5.

A flywheel 8 is provided at the front of the engine 6, an output pulley 10 is provided at the front thereof, and an output pulley 10 and an input pulley 1 provided at the front of the front axle 11 are provided.
A belt 13 is wound between the two and the rotational power of the engine 6 can be used as the PTO system power. That is, the rotational power of the engine 6 can be used to drive the cutting blade 30 in the mower deck 27 described later.

In this embodiment, the engine 6 is attached to the machine body in a rearward posture, that is, the flywheel 8 is in the front and the suction fan 7 is in the rear, and from the intake panel surface 98 below the steering handle 97. The sucked outside air is discharged from the front surface of the hood 5.

A transmission case 15 is provided at the rear of the traveling vehicle body 2, and a hydrostatic continuously variable transmission 17 is attached to the front of the transmission case 15. The output shaft 14 of the engine 6 and the input shaft (pump shaft) 20 of the hydrostatic continuously variable transmission 17 are universal joints 2
This universal joint 22
The engine 6 side rotational power is transmitted to the mission case 15
It is configured to transmit to the side. A PTO shaft (not shown) is provided on an extension line of the input shaft 20, and the PTO shaft drives another working machine connected to the rear part of the machine body.

The rotational power reduced by the transmission in the transmission case 15 is further reduced by the gear mechanism in the portal type rear axle housing 16, and the reduced rotation is transmitted from the lower end of the rear axle housing 16 to the left and right rear wheels 4. It is configured to be transmitted to. The inside of the lower end of the portal-type rear axle housing 16 and the ladder-type main frame 9 provided on the left and right sides of the traveling vehicle body 2 along the front-rear direction have the rear ends as shown in FIGS. 2 and 4. Reinforcement frame 1 expanded outward
8 and 18 are connected to each other.

Main frames 9, 9 and reinforcing frame 1
A pipe 19 is laid in the left-right direction inside the main frames 9 and 9 where 8 and 18 are superposed and fixed. In this way, by placing the reinforcing frames 18, 18 between the main frames 9, 9 and the rear axle housing 16, both the main frames 9, 9 and the portal type rear axle housing 16 bear the load received by the rear wheel 4. Can be made.

Therefore, even if the rear wheel 4 receives a strong impact while traveling on a rough road or in a work place with a lot of irregularities, the load is not applied only to the portal rear axle housing 16 but dispersed to the main frame 9. You can A mid mower 24 is attached to the lower abdomen of the traveling vehicle body 2 and is supported by a lifting link 25 (FIG. 1) so as to be lifted and lowered. It should be noted that when raising and lowering the midmore 24, hydraulic pressure may be used for raising and lowering, but it is also possible to construct such that the midmore 24 is lifted or lowered by manual operation by interlocking an operation lever (not shown) and the raising and lowering link 25. .

In this embodiment, the two cutting blades 30, 30 are rotated in the mower deck 27 of the mid mower 24 so that they are rotated in opposite directions, and as shown in FIG. 2, they are rotated with a phase difference of 90 degrees. It is configured to do. In this embodiment, the left cutting blade 30 rotates clockwise when viewed from above, and the right cutting blade 30 rotates counterclockwise.

Further, these two cutting blades 30, 30 are driven by a PTO drive system at the front of the machine body. Specifically, rotational power from the input pulley 12 is universal joint 31, mower deck 27. A vertical axis 29 for supporting the cutting blades 30, 30 by transmitting power to the left and right gear cases 35, 35 via the input shaft 33 sequentially supported by the upper gear case 32 and further via the two transmission shafts 36, 36. , 29
Is configured to rotate.

The left half of the upper surface of the mower deck 27 has a shape that gradually swells while swirling in the clockwise direction, and the right half has a shape that swells while swirling in the counterclockwise direction, and they meet at the central portion and are viewed from the side. Thus, one discharge passage 37 is formed which is raised to the rear.

A cylindrical shooter 38 is continuously provided in the discharge passage 37, and the shooter 38 is continuously provided at an opening 40a of a grass-collecting collector 40 mounted on the rear portion of the body through a space between the portal type rear axle housings 16. It is configured to be done. The collector 40 is made of a hard resin except for the front surface, and is provided with a mesh 41 that allows ventilation on both left and right sides.

A hydraulic cylinder 45 for rotating the collector 40 is provided above the columns 44, 44 standing from the lower end of the rear axle housing 16. When the hydraulic cylinder 45 is shortened by operating a hydraulic lever or the like, the collector cylinder 40 is shortened. The bottom part rises as shown by the chain double-dashed line in FIG. 1 to discharge the contained grass, and on the contrary, when the hydraulic cylinder 45 is extended, the collector 40 is rotated downward to discharge the shooter 38.
8a and the lower opening of the front surface of the collector 40 are aligned with each other, so that grass and grass can be re-entered into the collector 40.

It should be noted that the opening of the collector 40 in this embodiment is tilted backward so that the lower end is located on the front side and the upper end is located on the rear side as seen from the side as shown in FIG. Grass is likely to accumulate at the bottom of 40, and the upper end of the opposing shooter 38 is at the rear position, and the lower end is at the front position.

Next, the mounting structure of the front axle 11 and the power steering hydraulic cylinder 48 will be described with reference to FIGS. FIG. 6 is a plan view showing the mounting of the front axle 11 and the hydraulic cylinder 48 for power steering. The boss 11a of the front axle 11 is provided between the two plate bodies 49, 49 installed between the left and right main frames 9, 9. Position the center pin 50 on this boss 11a.
Insert the front axle 11 into the center pin 5
It is swingable up and down around 0.

The front axle 11 has a mountain shape with a thick central portion when viewed from the top and a narrower shape toward the tip side, and the front wheel support portion, in other words, the front and rear position of the knuckle arm 52 is changed by reversing the direction of the front axle 11 back and forth. It is configured to do.

In this embodiment, when the front axle 11 is attached so that the mountain-shaped top portion faces forward (state of solid line), the front wheel support portion is located rearward, and conversely the top portion faces rearward (state of dotted line). When the front axle 11 is attached between the two plate breams 9 and 49, the front wheel support portion is located forward.

The rear end of the power steering hydraulic cylinder 48 for rotating the knuckle arm 52 about the vertical axis is supported by the left main frame 9. More specifically, the front end of the piston rod 53 is the knuckle arm 5.
The main body of the hydraulic cylinder 48, which is connected to No. 2 and is not related to expansion and contraction, is attached to the seat 54 via the ball joint 51. This seat 54 has three bolts 55, 55,
55 is detachably fixed to the left main frame 9.

The seat 54 can be moved forward and backward as the front axle 11 is reversed and fixed to the main frame 9. Therefore, the main frame 9 can be secured.
A screw hole 56, 56, 56 for position adjustment is formed in the front of the screw hole 56, 55, 55, through which three bolts 55, 55, 55 can be inserted and fixed.

As shown in FIG. 6, the front axle 11
When the front wheel support is located rearward with the mountain top of the front facing forward, the seat 54 is also set to the rear position, and when the front axle 11 is turned upside down, the seat 54 is moved forward and the hydraulic cylinder 48 is also moved forward. Slide and install. Reference numeral 58 is a tie rod that connects the left and right front wheels. In any state, when the steering handle 57 is turned to make a right turn, the oil sent from the power steering unit (not shown) enters the hydraulic cylinder 48 to retract the piston rod 53 and move the front wheel 3 to the front wheel 3. Turn to the right.

On the contrary, when the steering handle 57 is steered to the left, the piston rod 53 moves forward to rotate the knuckle arm 52 counterclockwise, thereby cutting the front wheel 3 to the left. As shown by the dotted line in FIG. 6, when the power steering hydraulic cylinder 48 is moved forward, the wheel bases of the front and rear wheels 3, 4 become large, and when the power steering hydraulic cylinder 48 is moved backward, the wheel base becomes small. Become.

Next, the structure of the riding lawn mower shown in FIGS. 7 and 8 will be described. The riding lawn mower described here relates to a mounting structure of a universal joint 72 that connects the engine 70 and the input shaft 71a on the side of the hydrostatic continuously variable transmission 71. In a so-called rear discharge type lawnmower in which a mower deck 73 having three cutting blades is attached to the lower part of the abdomen of the vehicle body and the grass and lawn that have been cut are discharged from the rear of the mower deck 73, the grass between the rear wheels 75, 75 is Because it is necessary to provide a transport path for the rear wheel 7 on one side (the right side in FIG. 8)
There is no choice but to put it inside 5.

For this reason, the universal joint 72 connecting the engine 70 and the hydrostatic continuously variable transmission 71 is obliquely provided, and the bending angle of the universal joint 72 may become large. In the worst case, the universal joint 72 breaks due to vibration or resonance during power transmission.

Therefore, a gear case 80 having input / output shafts 78 and 79 is detachably attached to the front portion of the hydrostatic stepless transmission 71 so that the universal joint 72 is not broken, and the engine 70 side. Output shaft 70
The universal joint 72 interlocks a with the input shaft 78 on the gear case 80 side.

In this case, the bending angle of the universal joint 72 is approximately 0 degree, and therefore, there is no fear that the universal joint 72 will be greatly shaken to the left or right during rotation, which may cause vibration or cause resonance. It never becomes. Reference numeral 82 in the figure is a front wheel,
Reference numeral 83 is a front axle, 84 is a frame, and 85 is a shooter. Although illustration is omitted, in this case, the engine 7
0 Mower deck 73 using power extracted from the front
Drive the cutting blade inside.

Next, the structure of the cutting blades 30 and 74 shown in FIG. 9 will be described. What is described here relates to improving the durability of the cutting blades 30, 74. It is known that when grass cutting work is performed while rotating the cutting blades 30 and 74 at high speed, the wear proceeds from the tip portion near the inner peripheral surface of the mower deck. This wear progresses faster on the rising surface T, which is referred to as the air blower, than on the cutting edge portion S, and the cutting blades 30 and 74 are normally replaced by deformation, damage, or disappearance of the rising surface T.

For this reason, in the improved blade, the cutting blades 30 and 74 are built up only on the left and right end portions thereof to prevent abrasion. The durability can be improved at a low cost compared with the case where the entire cutting portion is padded. Any method such as welding or spraying may be used as the padding method. In this embodiment, spring steel SUP is used as the base material of the cutting blades 30 and 74, and alloys such as chromium, nickel and boron are used as the welding and spraying materials.

Next, the configuration of FIG. 10 will be described. The riding lawn mower described here relates to a lawn mower having four cutting blades 91 and two shooters 94. Running car body 9
A mower deck 92 having four cutting blades 91, 91, 91, 91 is attached to the lower part of the abdomen of 0, and the center of the machine body is sandwiched between them on the right side.
The two cutting blades 91, 91 and the two cutting blades 91, 91 on the left side are rotated in opposite directions with a phase difference of 90 degrees as shown by the arrow.

A pair of left and right shooters 94, 94 are arranged outside the rear wheels 93, 93. The front ends of the shooters 94, 94 are connected to the rear portion of the mower deck 92 and the shooter 9 is connected.
The rear ends of 4, 94 are connected to one collector 95 mounted on the rear part of the body. In this example, two cutting blades 91, 91
On the other hand, since one shooter 94 is provided, the grass is discharged easily, and the cutting width is large, so there is little uncut residue.

Further, since the shooters 94, 94 pass through the outside of the rear wheels 93, 93 on both the left and right sides, clogging of the shooters 94, 94 can be dealt with quickly. Next, the operation of the riding lawn mower described with reference to FIGS. 1 to 6 will be described. When the engine 6 is started and power is transmitted to each rotating part and the traveling vehicle body 2 is moved forward and the two cutting blades 76, 76 are rotated in opposite directions to start the mowing work, the grass and turf are raised to a predetermined height. After being cut, they pass through the discharge passage 37 in the mower deck 27 and are discharged rearward from the discharge port at the rear end, and are collected in the collector 40 mounted on the rear portion of the machine body.

When the inside of the collector 40 is filled with grass or grass, the operating lever or switch is operated to discharge the hydraulic oil in the hydraulic cylinder 45 to shorten it, and the collector 40 is rotated to move the inside. Release and release grass and grass. When replacing the midmore 24 to increase the cutting width, first
The universal joints are removed, the mower deck 27 that has been worn until then is pulled out from the side, and the one-size larger mower deck 27 is attached to the lower abdomen of the traveling vehicle body 2.

The front end of the mower deck 24 to be replaced has the front wheel 3
Front axle 11
Flip back and forth. At the same time, the seat 54 to which the rear end of the piston rod 53 of the hydraulic cylinder 48 for power steering is attached is removed and moved forward, and again fixed to the main frame 9 with the three bolts 55, 55, 55.

In this way, the mower deck 27 is inserted from the side in a state where a wide space for the mower deck to enter is secured, and the traveling vehicle body 2 and the mower deck are connected by the elevating link, and then the universal joint is interposed so that the rotation of each rotating portion can be prevented. It is set to a state where it is possible.

[0041]

According to the first and second aspects of the present invention, there is provided a riding lawn mowing apparatus in which a mower deck 27 covering the cutting blade 30 is attached to the lower abdomen of a traveling vehicle equipped with front wheels 3 and rear wheels 4 so as to be able to move up and down.
The front axle 11 that supports the front wheels 3 is provided so as to be swingable around a shaft 50 along the front-rear direction, and the front axle 11 is provided so as to be reversible in the front-rear direction.
It is possible to easily change the wheel base depending on the size and type of work equipment attached to the lower part of the abdomen. In addition, since the front axle 11 can be easily rotated back and forth, new parts and extra parts for changing the wheel base can be used. No need,
The manufacturing cost can be reduced.

According to the third aspect of the present invention, the knuckle arm 52 for rotating the front wheel 3 about the vertical axis is connected to the front end of the power steering hydraulic cylinder 48 mounted on one of the left and right sides of the machine body. Since the rear end mounting position of the power steering hydraulic cylinder 48 can be changed back and forth when the front axle 11 is reversed, the frame for mounting the power steering hydraulic cylinder 48 is also one type. The cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall side view of a riding lawn mower.

FIG. 2 is a plan view thereof.

FIG. 3 is a side view of a main part.

FIG. 4 is a plan view of a main part.

FIG. 5 is a side view of a hydraulic cylinder mounting portion for power steering.

FIG. 6 is a plan view thereof.

FIG. 7 is a side view of another riding lawn mower.

FIG. 8 is a side view thereof.

FIG. 9 is a perspective view of a cutting blade.

FIG. 10 is a plan view of another riding lawn mower.

[Explanation of symbols]

1 Riding lawn mower 2 running car 3 front wheels 4 rear wheels 5 bonnet 6 engine 9 frames 15 mission case 16 Rear axle housing 17 Hydrostatic type continuously variable transmission 18 Reinforcement frame 48 Hydraulic cylinder for power steering 50 center pin 52 Knuckle Arm

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoshi Matsuki             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Haruyoshi Honda             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Takeshi Kishi             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Jie Okamoto             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Tomio Kiyokawa             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Toda Daison             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Haruka Mitsuru             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. F term (reference) 2B083 AA02 BA18 DA02 EA10 EA19                       FA06 FA11 GA06 HA32 HA34                       HA60

Claims (3)

[Claims] 1. A riding lawnmower in which a mower deck 27 covering a cutting blade 30 is attached to a lower abdomen of a traveling vehicle equipped with front wheels 3 and rear wheels 4 so as to be able to move up and down. A riding lawn mowing device characterized in that the front axle 11 is provided so as to be swingable up and down around an axis 50 along which the front axle 11 is reversible. 2. The riding lawnmower according to claim 1, wherein the wheel base between the front and rear wheels 3, 4 can be changed by reversing the front axle 11 forward and backward. 3. A front knuckle arm 52 for rotating the front wheel 3 about a vertical axis and a front end of a power steering hydraulic cylinder 48 attached to one of the left and right side portions of the machine body for connecting the front axle 11 to the front-rear direction. Along with this, the rear end mounting position of the power steering hydraulic cylinder 48 can be changed back and forth.
The riding lawn mower described.