JP2003158907A - Sulky lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sulky lawn mower capable of smoothly and readily storing reaped grass into a collector. <P>SOLUTION: In this sulky lawn mower, a mower deck for covering two pieces of reaping blades is attached to the lower part of the center of a traveling vehicle body equipped with front wheels and rear wheels and a collector for collecting grass is installed in the rear of the vehicle body and the mower deck and the collector are connectedly installed through a chute. In the lawn mower, left and right rear wheel final cases for supporting rear wheels and a transmission case are formed in a gate shape when viewed from the backside and the chute is inserted into a space part which the gate forms. A front gear box is fixed to the front of the upper surface of the mower deck and an input shaft is installed in the front gear box and the power on the engine side is transmitted to the input shaft and the output shaft of the front gear box is interlocked and connected through a transmission shaft to the input shafts of a pair of left and right gear boxes for driving reaping blades. <P>COPYRIGHT: (C)2003,JPO

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. Generally, in such a lawnmower, the lawn mowed is discharged from the outlet formed on the right side of the mower deck, or is collected by a collector at the rear of the vehicle body via a cylindrical shooter connected to the outlet.

[0003]

Among the conventional devices, in the former type, in which the cut grass and grass are spit out, the cut grass and the like are scattered on the ground, so that the appearance of the cut mark is poor. Moreover, if these are blown off by the wind, they will fall on the surrounding workers and private houses and cause environmental pollution, and in the latter case, they will be collected by the collector via the shooter on the side of the fuselage. However, since the shooter largely projects laterally, it is difficult to work in a narrow space, which hinders the turning operation, and there is a drawback that a small turn is not possible.

[0004]

The present invention has been proposed in view of the above-mentioned problems, and therefore, the following technical means have been taken. That is, according to the invention of claim 1, two cutting blades 7 are provided on the lower abdomen of the traveling vehicle body 2 having the front wheels 3 and the rear wheels 4.
Attach the mower deck 75 that covers 6,76 so that it can move up and down,
In a riding lawnmower in which a grass collecting collector 69 is attached to the rear part of a vehicle body, and a mower deck 75 and a collector 69 are continuously provided via a shooter 58, left and right rear wheel final cases 60, 60 supporting the rear wheel 4 And mission case 15
In addition, the riding lawnmower is characterized in that and are formed in a gate shape when viewed from the back, and a shooter 58 is inserted into a space portion formed by the gate shape.

Further, in claim 2, the differential shafts 36, 36 projecting left and right from the mission case 15, and the rear axle 6 projecting from the lower part of the rear wheel final case 60, 60.
2, 62 and the bevel gear mechanism 63, 64, 65, 66,
The riding lawnmower according to claim 1, wherein the riding lawnmower is configured to interlock with each other.

Further, in claim 3, a mower deck 75 for covering the two cutting blades 76, 76 is attached to the lower abdomen of the traveling vehicle body 2 having the front wheel 3 and the rear wheel 4 so as to be able to move up and down, and for collecting grass at the rear portion of the vehicle body. In the riding lawnmower in which the collector 69 is mounted and the mower deck 75 and the collector 69 are continuously provided via the shooter 58, a front gear box 82 is fixed to the front upper surface of the mower deck 75. An input shaft 85 is mounted on the shaft 82, and the power on the engine 6 side is transmitted to the input shaft 85, and the output shaft of the front gear box 82 and a pair of left and right gear boxes 81 for driving the cutting blades are provided. 8
The riding lawnmower is characterized in that the input shaft 1 and the input shaft 1 are interlocked by a transmission shaft 84.

The operation of the above configuration is as follows. The turf is cut off by the two cutting blades 76, 76 that rotate when the power of the engine 6 is transmitted to the rotating parts to drive the cutting blades 76, 76 to rotate, and the cut grass passes through the shooter 58 and the rear part of the machine body. Is collected in the collector 69.

At this time, since the left and right rear wheel final cases 60, 60 for supporting the rear wheel 4 and the mission case 15 are formed in a gate shape as viewed from the rear, the diameter of the shooter 58 inserted into the space is large. As a result, there is little clogging of the grass and the like, and a large amount of grass and the like can be smoothly conveyed into the collector 69 and collected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. First of all, from the structure, a riding lawn mower 1 is provided with a front wheel 3 and a rear wheel 4 at a front portion and a rear portion of a traveling vehicle body 2, and an engine 6 is mounted inside a hood 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. In this embodiment, the input / output pulleys 10 and 12 have front and rear two-stage grooves, and two belts 13 and 13 are wound around these grooves.

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 19 of the engine 6 and the input shaft (pump shaft) 20 of the hydrostatic continuously variable transmission 17 are interlockingly connected by a universal joint 22, and the universal joint 22 transfers the rotational power on the engine 6 side to the mission case 15. It is configured to transmit to the side.
A PTO shaft 24 is provided on the extension line of the input shaft 20, and the PTO shaft 24 drives another working machine connected to the rear part of the machine body.

Motor shaft 25 of hydrostatic stepless transmission 17
A pinion gear 26 is provided at the rear end of the pinion gear 2.
A bevel gear 32 on a counter shaft 30 is meshed with the gear 6, and an output gear 34 for transmitting power to a differential device 33 is fixed to the counter shaft 30. The differential device 33 is incorporated in a pair of left and right differential shafts 36, 36 parallel to the counter shaft 30, and multi-plate brake devices 38, 38 are attached to the differential shafts 36, 36, respectively. When one brake pedal (not shown) is depressed, the two brake cam shafts 39, 3 pivotally supported at the bottom of the mission case 15
9 are rotated at the same time to move the cam plates 40, 40 outward in the axial direction so that the plurality of brake plates 42 are pressed against each other. Reference numerals 44 and 44 are steel balls.

Further, donut-shaped spacers 45, 45 are provided outside the plurality of brake plates 42, 42, and the brake plates 42, 42 ... By changing the thickness t of the spacers 45, 45 in the left-right direction. It is configured so that it can respond to changes in the number of sheets. The spacers 45, 45 are shoulder portions 48 formed inside the rear axle housing 47, 47,
The outer peripheral edge portion is pressed against the positioning member 48, and when the cam plates 40, 40 of the brake devices 38, 38 move outward and the brake plates 42, 42 ... It is configured to prevent the plate 42 from moving to the outside.

In the above example, when the number of brake plates 42 is reduced, the wall thickness t of the spacers 45, 45 is increased, and conversely, when the number of brake plates 42 is increased, the spacer 4 is used.
The thickness t of 5,45 is reduced to meet the specification change. In this embodiment, since the brake devices 38, 38 are provided on the left and right differential shafts 36, 36, when the brake is applied to stop the traveling vehicle, the left and right rear wheels 4, 4 are locked together. Therefore, the vehicle body can be reliably stopped even on a sloping ground.

A cylindrical diff lock body 52 having a diff lock claw 50 is spline-fitted to the left and right diff shafts 36 so as to be movable left and right, and the claw 50 of the diff lock body 52 is fitted to a claw 53a on the diff case 53 side. When engaged, the differential device 33 is locked to prevent the differential from working. In the figure, reference numeral 54 is a diff lock operation shaft, and 55 is a diff lock shifter. When a diff lock pedal (not shown) is depressed, the diff lock operation shaft 54 is rotated to move the diff lock shifter 55 inward in the left-right direction (see FIG. 3). On the left), the claw 50 of the diff lock body 52 and the diff case 53
The claws 53a are engaged with each other.

FIG. 5 shows a side cross-section of the main part of the mission case 15. The diff shaft 36 is set slightly above the counter shaft 30, and the bottom of the mission case 15 that covers them is positioned higher toward the rear side. The curved surface is gently curved, and is configured to follow the curved shape of the upper surface of the shooter 58 of the mower described later. With this structure, the passage of the shooter 58 can be maximized.

Further, as shown in FIG. 3, cylindrical rear wheel final cases 60, 60 made of cast metal are provided on the outer side of the rear axle housings 47, 47 so as to be inclined so that the lower side is closer to the outer side. Further, rear axles 62, 62 are horizontally and horizontally mounted on the lower portions of the rear wheel final cases 60, 60, and the rear wheels 4, 4 are attached to the end portions of the rear axles 62, 62. In the figure, reference numerals 63 and 64 are bevel gears, 65 is a transmission shaft vertically mounted, 66 and 6
7 is a bevel gear.

In the above, looking at the transmission of the rotational power on only one side, the rotation of the differential shaft 36 is determined by the rotation of the bevel gears 63, 6
4, the transmission shaft 65 and the bevel gears 66 and 67 are sequentially transmitted to the rear axle 62 to drive the rear wheel 4. As is apparent from FIG. 3, the left and right rear wheel final cases 60, 60, the mission case 15, and the rear axle housing 47.
A gate-shaped transmission section is formed by and when the shooter 58 is inserted into the space S formed by these sections.

Further, behind the shooter 58 is attached a collector 69 for storing cut grass and grass. The lower part of the front surface of the collector 69 is opened, and the collector 69 is entirely made of a hard resin. And the rear wheel final case 60, 60
The collectors 6 are installed on the stanchions 72, 72 which are erected from the lower end of the
A hydraulic cylinder 73 for rotating 9 is provided, and when the hydraulic cylinder 73 is extended by operating a hydraulic lever or the like, the collector 69 rises to discharge the hay that is contained therein, and conversely shortens the hydraulic cylinder 73. When the collector 69 is rotated downward, the discharge port 58a of the shooter 58 and the lower opening of the front face of the collector 69 are aligned with each other so that grass and grass are collected again.
I'm trying to get inside 9.

Next, the mower deck 7 will be described with reference to FIGS. 1 and 2.
The structure of No. 5 and the transmission structure of the mower deck 75 will be described. The mower deck 75 that covers the two cutting blades 76, 76 has a substantially 8-shaped shape when viewed in plan and is symmetrical,
76 rotate in opposite directions. The right cutting blade 76 rotates counterclockwise and the left cutting blade 76 rotates clockwise in the traveling direction.

The right mower deck portion 75R is provided with a discharge passage 77 that swirls in a counterclockwise direction and rises along the rotational direction of the cutting blades 76, 76, and the left mower deck portion 75L is clockwise. A discharge passage 78 that swirls and rises is provided, and the left and right discharge passages 77, 78 merge at the left and right central portions to form a single discharge passage. The discharge passage 78 extends rearward as it is and cuts from the rear end of the shooter 58. The grass and grass are ejected backward.

In this embodiment, the merging portion of the discharge passages 77, 78 is extended rearward as it is and a separate shooter 58 is connected to the rear end portion thereof.
The rear ends of 7, 78 may be integrally configured. And
Each cutting blade 76, 76 is fixed to the lower part of the vertical axis 80, 80,
Vertical axes 80 and 80 are left and right mounted on the upper surface of the mower deck 75.
It is pivotally supported by two gear boxes 81, 81.

A gear box 82 is also fixed to the center front part, and the gear box 82 and the gear boxes 81, 81 at two places on the left and right are interlockingly connected via transmission shafts 84, 84. Further, an input shaft 85 is mounted on the front portion of the front gear box 82 so as to face forward, and the input shaft 85 and the intermediate shaft 87 integrally supported by the engine 6 are connected by a universal joint 8
8 are connected.

More specifically, as shown in FIG. 11, a plate 83 is attached to the front surface of the engine 6, and the plate 8 is attached.
3 and a plate 86 having a cylindrical body 86a at a lower portion and supporting the intermediate shaft 87 are integrated by a bolt 93. The input pulley 12 is attached to the front part of the intermediate shaft 87.

Therefore, when the engine 6 is started and the belt 13 wound between the input pulley 12 and the output pulley 10 is operated to operate the tension clutch 74 on the entry side to bring the tension roller into pressure contact with the belt 13, 6
The rotational power on the side is transmitted to the mower deck 75 side through the input / output pulleys 10 and 12, the belt 13, the intermediate shaft 87, the universal joint 88, and the input shaft 85 in order, and further to the left and right via the pair of transmission shafts 84 and 84. Gearbox 81,8
1, and the two cutting blades 76, 76 are rotated in opposite directions.

In the above example, since the lower input pulley 12 and the upper output pulley 10 are all supported so as to move integrally with the engine 6, even if the engine 6 vibrates, the shaft between the two pulleys is increased. The distance between them does not change, the power transmission is not hindered, the torque is reliably transmitted, and the cutting blades 76, 76 in the mower deck 75 can always be rotated at the set rotation speed to reliably cut grass or grass. . Since the rotation does not fluctuate, there is less grass clogging and the mower mowing performance can be improved. In the past, it was common to use two straps, but with such a structure, the belt 13 slips less and the life of the belt becomes longer.

The mower deck 75 and the traveling vehicle body 2 side are supported so as to be movable up and down, for example, via a parallel link mechanism 90 or the like. The mower deck 75 shown in FIG. 1 is in a state where the lawn mowing work is performed by landing (solid line) and the mower deck 75.
The figure shows two cases of a state in which the is being lifted and moving (virtual line). Reference numerals 91 and 92 in the drawing denote gauge wheels, and the height of the rear gauge wheel 92 can be changed.

Reference numeral 94 is a seat, 95 is a fuel tank, 96 is a fender, 97 is a steering wheel, and 98 is a dustproof cover. In this riding lawn mower 1, the engine 6 is mounted in the reverse direction, and when the suction fan 100 rotates, the air sucked from the mesh of the dustproof cover 98 is discharged from the front side of the bonnet 5, and in the meantime, the engine accessories in the bonnet 99 are discharged. Is configured to be cooled.

Next, the operation of the above example will be described. When the engine 6 was started, power was transmitted to each rotating part, and the traveling vehicle body was moved forward, the two cutting blades 76, 76 were rotated in opposite directions to start the mowing work, and the cutting was performed at a predetermined height. Grass and turf are discharged rearward from the discharge port 58a at the rear end through the discharge passages 77 and 78 in the mower deck 75, and are collected in the collector 69 mounted on the rear part of the machine body.

When the inside of the collector 69 is full of grass or grass, the operating lever or switch is operated to discharge the hydraulic oil in the hydraulic cylinder 73 to shorten it, and the collector 69 is rotated to move the inside. Release and release grass and grass. 6,
FIG. 7 is an operation explanatory view of a part of the mower deck 75 and a part of the shooter 58 which are improved. To explain the configuration of these improving devices, the discharge passage 77 (78) of the mower deck 75.
The ceiling of the merging portion is opened and the opening is covered with a lid 101 having an inverted U-shaped cross section. The lid 101 has a fulcrum pin 1 at the front end of the confluence of the discharge passages 77 and 78.
On the other hand, on the shooter 58 side, elongated holes 104, 104 are provided on the left and right of the upper front side and are linear and inclined so as to be lower toward the front side. Then, the discharge passage and the shooter 58 are connected by the pins 105, 105, and when the mower deck 75 is lifted high as shown in FIG. 7, the pins 105, 105 move to the upper ends along the long holes 104, 104, and as a result, Mowing grass and lawn grass fly far inside the collector 69 so that a large amount of grass is collected in the collector 69.

On the contrary, when the mower deck 75 is lowered to reduce the cutting height, the pins 105, 105 are located in the elongated holes 104, 104 below the shooter 58 as shown in FIG.
In this case, the lids 101, 101 are fulcrum pins 103, 10
Stand up so that the rear end is high with 3 as the center. For this reason, even if the cutting height is lowered, the area of the discharge passage is expanded, and the grass and grass can fly far inside the collector 69. As a result, a large amount of grass is collected in the collector 69.
It can be housed inside.

Finally, a modified example of the shooter 58 shown in FIG. 8 will be described. Generally, in a so-called rear discharge type mower that discharges grass from the rear of the mower deck, the mower deck and collector are connected by a cylindrical shooter, but the top and bottom of the shooter can be opened and closed to deal with grass clogging. A flexible cover is often provided.

The modification described here is in such a form, and is provided with a cover so that grass and turf are not newly caught on the corners of the shooter. The configuration will be described with reference to FIGS. 8, 9 and 10.
Shows a conventional type shooter 106. An opening 107 is formed on the upper surface of the shooter 106, and the opening 107 is covered with a cover 108 made of an iron plate. FIG. 9 is a cross-sectional view taken along the line AA of this conventional device, but the grass is apt to be caught in the corner 109 formed on the inner surface of the shooter 106. Therefore, the resin material 110 is attached to this portion as shown in FIG. It was

In this way, the resin material 110 is covered with the iron cover 1
When it is attached to the inner surface of 08, the step disappears and the catch of grass or grass is eliminated.

[0035]

According to the invention of claim 1, a mower deck for covering two cutting blades is attached to the lower abdomen of a traveling vehicle body having front wheels and rear wheels so that the mower deck can be raised and lowered, and a collector for collecting grass is attached to the rear portion of the vehicle body. In a riding lawnmower in which a mower deck and a collector are connected via a shooter, the left and right rear wheel final cases supporting the rear wheels and the mission case are formed in a gate shape when viewed from the rear, and the gate type Since it is a riding lawnmower characterized by inserting a shooter in the space formed by, it is possible to effectively utilize the space, it is possible to increase the inner diameter of the shooter, mowing grass into the collector,
The grass can be easily collected and grass clogging can be reduced.

The invention of claim 2 is characterized in that a differential shaft projecting left and right from the mission case and a rear axle projecting from the lower part of the final case are interlocked via a bevel gear mechanism. Since the riding lawnmower of No. 1 is used, the transmission mechanism can be configured simply and an inexpensive riding lawn mower can be obtained.

According to a third aspect of the present invention, a mower deck for covering two cutting blades is attached to the lower abdomen of a traveling vehicle equipped with front wheels and rear wheels so as to be able to move up and down, and a collector for collecting grass is attached to the rear of the vehicle. In a riding lawnmower in which a mower deck and a collector are connected via a shooter, a front gear box is fixed to the front part of the upper surface of the mower deck, and an input shaft is mounted on the front gear box. Along with transmitting power from the engine to this input shaft, the output shaft of the front gearbox and the input shafts of the pair of left and right gearboxes that drive the cutting blades are linked by a transmission shaft. Since it is a lawnmower, the transmission mechanism is simple, and there is no slip due to belt transmission as in the past, so durability is also improved.

[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 rear view of the main part.

FIG. 4 is a cross-sectional view of a mission.

FIG. 5 is a side sectional view of a main part.

FIG. 6 is an operation explanatory view.

FIG. 7 is an operation explanatory view.

FIG. 8 is a plan view of a conventional shooter.

9 is a cross-sectional view taken along the line AA of FIG.

10 is a cross-sectional view of an improved portion of FIG.

FIG. 11 is an enlarged side view of a main part.

[Explanation of symbols]

1 Riding lawn mower 2 running car 3 front wheels 4 rear wheels 5 bonnet 15 mission case 17 Hydrostatic type continuously variable transmission 33 differential device 36 differential shaft 38 Brake device 40 cam plate 42 brake plate 52 Deflock 58 Shoota 60 rear wheel final case 69 collector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tadao Nishihara             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Nozomi Katakami             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. F term (reference) 2B083 AA02 BA12 BA18 CA09 DA02                       EA03 EA10 EA18 EA19 FA06                       FA13 GA02

Claims (3)

[Claims] 1. A vehicle body having front and rear wheels, which is provided at a lower portion of the abdomen of a vehicle body.
A mower deck that covers the blades of a blade is installed so that it can be moved up and down, a collector for grass is attached to the rear part of the vehicle body, and the mower deck and collector are connected via a shooter. A riding lawnmower characterized in that a rear wheel final case and a mission case are formed in a gate shape when viewed from the back, and a shooter is inserted into a space formed by the gate shape. 2. The riding lawnmower according to claim 1, wherein a differential shaft protruding left and right from the mission case and a rear axle protruding from a lower portion of the rear wheel final case are interlocked with each other through a bevel gear mechanism. 3. A lower abdomen of a traveling vehicle having front wheels and rear wheels.
In the riding lawn mower, which is equipped with a mower deck that covers the blades so that it can be moved up and down, a grass collecting collector is attached to the rear of the vehicle body, and the mower deck and the collector are connected continuously via a shooter. Fasten the front gearbox, and install the input shaft on this front gearbox.
The power of the engine is transmitted to this input shaft, and the output shaft of this front gearbox and the input shafts of the pair of left and right gearboxes that drive the cutting blades are interlocked by a transmission shaft. Lawn mower.