KR20040040301A - Self-propelled lawnmower - Google Patents

Abstract

PURPOSE: Provided is a self-propelled lawnmower having an improved structure and thus, to enhance rotatability of the lawnmower, facilitate lawn mowing performance and increase user's convenience. CONSTITUTION: The self-propelled lawnmower includes two lawn mowing blades(31) rotatably installed inside a mower deck(28), a grass discharge chute(33) at the center of the mower deck(28) for discharging grass to the rear side of the lawnmower, a saw-toothed driving pulley(44) disposed at the upper portion of the mower deck(28), a saw-toothed input pulley(54) located on a lawn mowing blade driving axis(15) that supports the two lawn mowing blades(31), and a saw-toothed belt(55) for winding around the driving pulley(44) and the input pulley(54).

Description

Mowing device {SELF-PROPELLED LAWNMOWER}

The present invention relates to a mowing device for mowing grass or lawn.

It is known to mow grass or weeds by installing three mowing blades in a mower deck as a rotating material and attaching the mower deck to a lower part of the body as a lifting material (for example, See Japanese Patent Application Laid-Open No. 11-20484).

In general, such a lawn mower discharges the mowed grass or grass from the grass outlet formed on the right side of the mower deck, or recovers it to the collector mounted at the rear of the vehicle body through a cylindrical chute connected to the outlet. is average.

In the form of discharging shaved grass or grass from the mower deck's pool outlet, the shaved grass and grass are scattered on the ground, so the cut places are not good to see. On off there is a drawback leading to environmental pollution. In addition, since the chute protrudes in the lateral direction, it is difficult to work in a narrow place, which causes trouble in turning operation. Especially, weeding around trees The disadvantage is that the work of small turning radius is impossible.

In addition, the method of recovering to the collector while discharging the shaved grass to the rear by passing between the rear wheels from the underbody has a drawback that the discharge passage is easily blocked by the pool.

The present invention has been proposed in view of the above-mentioned problems, and is excellent in turning ability and smoothly performing the mowing operation, and at the same time, the smooth discharge of the grass in the mower deck of grass or grass cut by the mowing blade drive shaft The purpose of this study is to obtain a mowing device with excellent performance.

1 is an overall side view of a riding lawnmower.

2 is a plan view of the mower deck portion.

3 is a side view of the mower deck portion.

4 is a rear view of the mower deck portion.

5 is a plan view of a mowing blade.

6 is a front view of a mowing blade.

7 is an enlarged plan view of the main portion.

8 is an enlarged cross-sectional view of the main portion.

9 is a hydraulic circuit diagram.

10 is a plan view of a comparative example.

<Description of the symbols for the main parts of the drawings>

1 ... passenger mowing machine, 2 ... driving body,

3 ... the front wheel, 4 ... the rear wheel,

5 bonnet, 6 engine,

7 ... cooling fan, 8 ... frame,

9 ... Variable hydraulic pump for driving, 10 ... rear axle,

11 ... differential gear lock valve, 13.hydraulic motor for driving,

14 mowers, 16 steering wheels,

28 Mowerdeck, 33 Full discharge passage,

44 ... driven pulley, 54 ... input pulley,

55 ... belt.

That is, in the invention of claim 1, the two mowing blades 31 installed in the mower deck 28 by rotating materials are rotated in opposite directions to mow the grass, and the mowed deck of the mower deck 28 In the mowing device configured to discharge rearward from the pull discharge passage 33, a toothed drive pulley 44 is installed on the mower deck 28 to rotate by receiving power from the engine 6 side. The toothed belt 55 is wound between the toothed drive pulley 44 and the toothed input pulley 54 on the mowing blade drive shaft 15 supporting the two mowing blades 31. It was set as the structure of the mowing device characterized by the above-mentioned.

Moreover, in the claim 2, the teeth of the toothed belt 55 are formed over the front and back of the entire circumference of the belt 55 to have the configuration of the lawn mower according to claim 1.

Moreover, in the Claim 3, it was set as the mowing device of Claim 1 characterized by the shift | offset | difference phase difference of the said two mowing blades 31 about 90 degrees.

The action by the above configuration is as follows.

First, the rotational power of the engine 6 is transmitted to the drive pulley 44, and again to the toothed input pulley 54, and this rotational power rotates the mowing blade 31, one of the mowing blades rotates clockwise. And the other mowing blade is rotated in the opposite direction.

As a result, the grass or the grass that enters the moor deck 28 is cut by mowing blades 31 that rotate in opposite directions, and the two weeds 29 in the moor deck 28 are separated. Passing through the central portion 29S in the left and right directions, the liquid is collected by the collector 72 behind the traveling vehicle body 2 through the full discharge passage 33 and the chute 36 sequentially.

At this time, a plurality of teeth are formed in the belt 55 which is rotated between the pulleys 44, 54 and 54 to drive the mowing blade 31, and the pulleys 44 and 54 are formed through these teeth. Since the belt 55 does not slip even when the mowing blade 31 is subjected to a large load during the rotation of the belt 55, the phase of the two mowing blades 31 is shifted. Since the mowing blades 31 are not in contact with each other as in the prior art, they do not generate severe noise, and the grass or grass cut in the mower deck 28 does not block the inside of the mower deck 28, Grass or grass is quickly discharged outside the mower deck (28).

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings. Referring first to the configuration, reference numeral 1 is a riding type lawnmower provided with front wheels 3 and rear wheels 4 in the front part and the rear part of the traveling vehicle body 2, respectively, in a bonnet 5. Is equipped with an engine 6.

The variable hydraulic pump 9 for running is supported between the left and right pair of frames 8 which comprise a part of the traveling vehicle body 2. The output shaft 6a of the engine 6 is connected to the traveling variable hydraulic pump 9 through a coupling 12, and a differential gear lock valve 11 is installed at the rear thereof. Reference numeral 7 denotes a fan for cooling.

Then, the hydraulic oil sent out from the traveling variable hydraulic pump 9 is sent to the traveling hydraulic motor 13 attached to the left and right outer side of the rear axle 10 to drive the rear wheel 4 to rotate. In Fig. 1, reference numeral 17 denotes a link mechanism, and reference numeral 18 denotes a hydraulic cylinder for raising and lowering the mower deck 28.

Next, a single structure of the mower deck 28 of the mower 14 mounted on the lower part of the abdomen of the passenger lawn mower 1 will be described with reference to FIGS. 2, 3, and 4. . The mower deck 28 covers the periphery of the mowing blade 31 that rotates the two mowing blade driving shafts 15 with bearing bearings. The left half portion 28L of the moor deck 28 is provided with a right weed, and the left half 28R is provided with a spiral weeding path 29 which gradually rises in a spiral manner. The elderly 29 joins in the center portion 29S in the left and right directions and extends rearward as it is so as to form one pool discharge passage 33.

As shown in FIG. 4, a portion to which the blade drive shaft 15 is attached protrudes upward from the upper surface of the mower deck 28, and an attachment portion 35 having a trapezoidal cross section is formed here. Two mowing blade driving shafts 15 are supported by the bearing 39 on the attachment part 35, and these bearings 39 are fixed to the mower deck 28 by fastening means such as bolts.

An input pulley 54 having a plurality of teeth on the outer circumference is installed at the upper part of each mowing blade drive shaft 15, and the drive gear case 41 is located at the center front of the mower deck 28. It is installed by itself, the drive pulley 44 is fixed to the vertical axis 42 in the upper and lower directions provided in the drive gear case 41. A plurality of teeth is also formed on the outer circumference of the drive pulley 44. When the tension of the belt is insufficient, the drive gear case 41 is moved forward to fix it.

Power transmission to the drive gear case 41 is made in front of the engine 6, specifically driving the power take off (PTO) power drawn from the front of the engine 6 through a known power transmission means 20 such as a belt. It transfers to the gear case 41 side. Reference numeral 45 denotes a material joint shaft which transmits power to the mower deck 28 through the power transmission means 20, and a rear end thereof is connected to the input shaft 46 of the drive gear case 41 to connect the engine. (6) the rotational power is transmitted to the mower deck (28).

Also, as is apparent from FIG. 2, the upper surface of the mower deck 28 is provided with a toothed idler pulley 49, and the idler pulley 49 on the left side is slightly rearward of the left input pulley 54. The idle pulley 49 on the right side is installed at a position biased forward than the right input pulley 54, and is configured to largely hold the wound range of the input pulley 54 belt 55, respectively. It is.

A plurality of teeth are formed on the front and rear of the belt 55 in the entire circumference thereof so as to transmit power from the drive gear case 41 to the two input pulleys 54 without slip. The mowing blades 31 fixed to the lower part of the two mowing blade driving shafts 15 are 90 ° out of rotation phase as shown in FIG. 2, and the mowing blades 31 on the left rotate clockwise and mow on the right. The blade 31 is configured to rotate counterclockwise.

Therefore, when both of the mowing blades 31 rotate with each other, the mowed grass or grass joins the central pool discharge passage 33 through the weeding path 29 of the mower deck 28 and is transported backward. At this time, the rotating blade is transmitted to the two blades 31 without slip and because there is a phase difference of 90 °, the blades 31 are damaged during operation by not colliding with the blades 31 facing each other at the center. It doesn't happen.

Next, the detailed structure of the blade 31 is demonstrated with reference to FIG. 5, FIG. The mowing blade 31 has a slightly raised center in the front view, and blade portions 31a are formed at the starting end portions of the left and right ends in the rotational direction, and the rear end portions are upwards behind the blade portions 31a. A bent wind section 31b is formed. Ribs 32 are formed in the longitudinal direction of the blade blade 31 to reinforce the blade blade itself, and four ribs 32a of convex shape are formed in the central ridge downward, and convex ribs are formed on the flat portions of both sides. 32b is formed.

Since the ribs 32a of the central ridges are convex downwards, they do not cause interference when the attachment plate (not shown) on the upper surface of the mowing blade 31 is mounted, and the two ribs located on both sides are formed with convex ribs upwards. Because of this, this causes the wind effect. Also, because it is not convex downward, the planted grass will not touch this rib during mowing and create a resistance to rotation.

7 and 8 illustrate a method of attaching the driving pulley 44 in the drive gear case 41 portion. If a stone is interrupted during the rotation of the mowing blades 31 in the mower deck 28 or a very hard foreign object collides with the mowing blades 31, a drive system is broken, so measures are taken to prevent them.

Applicant has previously engaged by connecting a share pin between the mowing blade 31 and the support plate of the mowing blade drive shaft 15, but this method rotates on the mowing blade 31 when the shear pin is broken. Since power is not transmitted but is supported in a free-rotating state so that the cutting blade 31 does not fall down, when the cutting blade 31 is forcibly intersected with the other cutting blade 31, contact occurs, thereby cutting the cutting blade 31 ) There was a problem that a large noise occurs each time they hit each other. Therefore, the applicant has adopted a configuration for fastening the shear pins 57 between the drive pulley 44 of the drive gear case 41 and the longitudinal axis 42 supporting it, as shown in Figs.

When a large load is applied during the operation, only the shear pins 57 are broken so that the power of the engine 6 side is not transmitted to the mowing blade, which causes the two mowing blades 31 to maintain a 90 ° phase difference. It will stop as it is. Therefore, the problem that the blades 31 hit each other does not occur.

Next, the hydraulic system will be described with reference to FIG. 9. Although the fact that the traveling variable hydraulic pump 9 is driven by the power of the engine 6 has already been mentioned, the main gear pump 59 is driven by the power of the engine 6 and the main gear pump 59 The power steering apparatus 60 is driven by the hydraulic oil sent out. When the steering wheel 16 is steered left and right, the hydraulic fluid flows into or out of the cylinder 62 for power steering, and steering is performed.

The oil returned from the power steering device 60 enters into the valve 64 for raising and lowering the mower deck 28, and the valve 64 is provided with a rising position, a neutral position, and a lowering position. By operating a hydraulic operation lever or a lift switch (not shown), the entire moor deck 28 can be lifted and lowered.

In addition, the oil returned from the power steering apparatus 60 enters the valve 67 for external operation along the flow path 66. In this embodiment, by holding the operating lever 68 and moving it back and forth, the hydraulic oil 7 is supplied or discharged into the hydraulic cylinder 7 to pivot the collector 72.

Next, the structure of the traveling system will be described. The hydraulic fluid discharged from the traveling variable hydraulic pump 9 at the time of advancement enters the fractionation metal 74 and is divided into left and right sides, and the left and right independent travels. It flows into the hydraulic motor 13 and rotates the rear wheel 4. The hydraulic oil from these traveling hydraulic motors 13 passes through the differential gear locking valve 11 and passes through the flow path 76 to return to the traveling hydraulic motor 9 again. When reversing, the inflow and discharge directions are opposite to those in the above cases, and after passing through the differential gear lock valve 11, enters the traveling hydraulic motor 13, joins in the sorting metal 74, and then runs the variable hydraulic pressure again. It is supposed to return to the pump 9.

In the case of forward or reverse movement, when the solenoid 11a of the differential gear locking valve 11 turns on both sides at the same time, the rotation speed of the left and right traveling hydraulic motor 13 becomes the same, and eventually the differential gear locking It becomes the operating state. 10 shows a structure in which the reverse blade box 80 is installed only on the right side so that the left and right mowing blades 31 rotate in opposite directions.

After installing the gear 84 in the lower part of the mowing blade fixing shaft 15 which fixes the right input pulley 54, and installing another gear 86 which meshes with this gear 84 in the back, A mowing blade is provided coaxially with the gear 86 so that this right mowing blade rotates counterclockwise. In this way, the reverse electric box 80 is installed to rotate the mowing blades 31 on the left and right in the opposite direction and the phases are shifted by 90 °, thereby reliably and smoothly sending the mowed grass or grass to the rear.

In this case, since the reverse electric box 80 on the right side is installed so that its longitudinal direction coincides with the front-back direction of the riding type lawnmower, it is possible to obtain the reverse drive mechanism of the mowing blade 31 that avoids the full discharge passage 33. Therefore, the discharge passage 33 of the pool should be narrowed or the height cannot be sufficiently taken, which does not interfere with the discharge of the pool.

Next, the operation of the above example will be described. By changing the inclination angle of the inclined plate of the traveling variable hydraulic pump 9 by stepping on the traveling pedal, the amount of oil sent to the traveling hydraulic motor 13 is adjusted to increase the traveling speed of the traveling vehicle body 2.

In this state, when the PTO clutch lever installed next to the cockpit 82 is pushed to the input side, the drive gearbox 41 passes through the belt transmission mechanism 20 and the material joint shaft 45 in which power of the engine 6 is not shown in sequence. Delivered to the side. The mowing blades 31 are opposed to each other by the toothed belt 55 wound around the drive pulley 44 on the drive gear box 41 and between the two left and right input pulleys 54 and the idle pulley 49. Rotationally driven.

At this time, the left mowing blade 31 is rotated clockwise when viewed from above and the right mowing blade 31 is rotated counterclockwise when viewed from above. Since the phase difference of 90 degrees is maintained, the mowing blades 31 on the left and right do not collide with each other at the time of the intersection during rotation. Therefore, the grass is mowed at a predetermined height by the mowing blades 31 on both sides and then guided to the pool discharge passage 33 at the center, and then toward the collector 72 through the chute 36. You are guided. At this time, since the teeth are formed on the entire outer circumference of the driving pulley 44 and the idle pulley 49 and the teeth are formed on the front and back surfaces of the belt 55 side, the belt 55 does not slip during rotation. The two blades 31 and 31 can be reliably rotated in the state where the phase difference between them is maintained at 90 degrees.

When moving in the pavement after the end of the operation to supply the hydraulic oil to the hydraulic cylinder 18 to raise the entire moor deck (28). Then, when the collector 72 is filled with the shaved grass, the hydraulic cylinder 70 for retracting the collector is retracted to pivot the collector 72 in the upward direction, and the grass filled therein is discharged onto the ground. After that, the hydraulic cylinder 70 is extended again to return the collector 72 to its original position.

In the invention of claim 1, the two mowing blades 31 installed in the mower deck 28 by rotating materials are rotated in opposite directions to mow the grass, and the mowed deck is discharged from the center of the mower deck 28. In the mowing device configured to discharge rearward from the passage 33, the mower deck 28 is provided with a toothed drive pulley 44 which is driven and rotated by the power coming from the engine 6 side. Since the toothed belt 55 is wound between the toothed drive pulley 44 and the toothed input pulley 54 on the mowing blade driving shaft 15 supporting the two mowing blades 31, Even when a large load is applied to the mowing blade 31 at the time of rotation of the two mowing blades 31, the belt 55 does not slip and the power can be reliably transmitted to the mowing blade driving shaft 15. In addition, since a special member such as a reverse electric case, which is conventionally required for reversing one side of the mowing blade, is not required, it can be configured at low cost and easy to maintain.

Further, in the invention of claim 2, the teeth of the toothed belt 55 are formed over the front and back of the entire circumference of the belt, and the mowing device according to claim 1, as well as one side of the belt 55. Both surfaces can be effectively utilized, so that abnormal wear of the toothed portion of the belt 55 is reduced, and durability is also improved.

Further, in the invention of claim 3, since the phases of the two mowing blades 31 are shifted by 90 degrees, the mowing blades do not come into contact with each other during the rotation of the mowing blades 31, and the mowing operation is not interrupted.

Claims (3)

The two mowing blades 31 installed in the mower deck 28 by rotating materials are rotated in opposite directions to mow the grass, and the mowed deck is pulled out in the center of the mower deck 28. A mowing device configured to be discharged backwards from (33), The toothed drive pulley 44 and the two mowing blades are installed on the mower deck 28 while the toothed drive pulley 44 is driven by the power coming from the engine 6 side. 31. A mowing device characterized in that a toothed belt (55) is wound between a toothed input pulley (54) on a mowing blade driving shaft (15) supporting the mowing blade driving shaft (15). The method of claim 1, The teeth of the toothed belt 55 are formed on the front and back of the entire circumference of the toothed belt 55. The method of claim 2, A mowing device, characterized in that the phase of the two mowing blades (31) is shifted by about 90 degrees.