JP2004337047A - Disc type blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noises produced on mowing works and improve workability. <P>SOLUTION: The subject disk type blade is characterized by disposing a disk 31 having a driving shaft 27 at the center and mowing blades 32 at the radially outer sites of the disk 31 in a state capable of being integrally rotated on the axis of the driving shaft 27, forming a plurality of penetrated holes 34 in the disk 31, and disposing a plurality of wind-forming members for forming air flows passing through the penetrated holes 34 with the rotation of the disk 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a blade mounted on a mower, and more particularly, to a disk-type blade including a disk and a cutting blade that rotate integrally around an axis of a drive shaft.
[0002]
[Prior art]
In a conventional mowing machine, a bar-shaped blade having a cutting blade and a wind wing formed at both ends thereof is generally adopted as a blade rotating around the axis of a drive shaft.
[0003]
[Patent Document 1]
JP-A-2001-45826 (paragraph number 0031, FIG. 2, FIG. 4-6)
[0004]
[Problems to be solved by the invention]
However, when the bar-shaped blade is used, there is a problem that the noise at the time of work becomes intense due to the wind noise generated on the rotation center side of the blade with the rotation.
[0005]
Therefore, in order to reduce the wind noise generated on the rotation center side of the blade, it is conceivable to provide a disk that covers the rotation area on the rotation center side, but in this case, both ends of the blade are rotated with the rotation of the blade. In the mowing area on the side, only upward airflow is generated by the wind wings, so the mowing grass is guided to the discharge path of the housing that covers the blade from above, and is directed from the discharge port to the outside of the machine or the grass collection container. In the so-called discharge work for discharging, the so-called mulching work in which the cut grass can be relatively well discharged from the discharge port, but the cut grass is cut with a blade of a blade and buried in the grass below the housing. In, the disk is used to cover the rotation area on the rotation center side of the blade, which was the area where the cut grass was allowed to flow downward between the grasses, so that the cut grass was cut. With hardly done be buried in Kusama of Ujingu lower, it was so adversely affect the work mowed grass on the disk is deposited.
[0006]
An object of the present invention is to improve workability while reducing noise generated during mowing work.
[0007]
[Means for Solving the Problems]
〔Constitution〕
In order to achieve the above object, according to the first aspect of the present invention, a disk having a drive shaft as a center and a cutting blade for cutting grass at a radially outer portion of the disk are provided on the drive shaft. In preparation for a state of being integrally rotated about the axis of the disk, a plurality of through holes are formed in the disk, and a plurality of wind generating bodies that generate an airflow passing through the through hole with the rotation of the disk are provided. is there.
[0008]
[Action]
According to the above configuration, at the time of work, the disc and the cutting blade rotate integrally around the axis of the drive shaft, and the cutting blade cuts grass at a radially outer portion of the disc. Generation of wind noise on the rotation center side is suppressed.
[0009]
If the mower equipped with the blades is to discharge the cut grass to the discharge path of the housing covering the blades from above and discharge the cut grass from the discharge port to the outside of the machine or the grass collection container, the mower is activated. If a wind generator is provided so that the air flow generated by the wind passes through the through hole of the disk with the direction going upward from the bottom of the disk, the grass allows the grass to flow more quickly along the discharge path of the housing. To the discharge direction.
[0010]
When the mower equipped with the blades performs mulching work in which cut grass is shredded with a cutting blade and buried in the grass below the housing, the airflow generated by the blasting body is directed downward from above the disk. If a wind generator is provided so as to pass through the through hole of the disc with the direction toward the, the airflow allows the sown grass to be well buried between the grass below the housing through the through hole without depositing on the disc. it can.
[0011]
〔effect〕
Therefore, in those performing discharge work, the disk provided with a breeze that generates an upward airflow provides excellent workability that allows more efficient discharge of cut grass while reducing noise generated during work. In addition, in the case of mulching work, the mowing grass is well buried in the grass below the housing while reducing the noise generated at the time of work by using a disk provided with a wind generator that generates a downward airflow. It is possible to obtain excellent workability.
[0012]
〔Constitution〕
According to a second aspect of the present invention, in the first aspect of the invention, the wind generator is provided so as to be detachable from the disk.
[0013]
[Action]
According to the above configuration, the wind generator mounted on the disk has a direction or an upward direction from below the disk to generate an airflow passing through the through hole of the disk, and a direction from above the disk to the downward direction. It is possible to change to a state or a state that generates an airflow passing through the through hole of the disk, or to adjust the number of wind generators mounted on the disk.
[0014]
As a result, it is possible to easily cope with the one performing the discharge operation and the one performing the mulching operation only by changing the blasting body to the disk. Also, for example, when the grass to be cut is slightly wet and easily adheres heavily, the number of wind generators attached to the disc is increased to increase the air flow generated by the wind generator, thereby discharging the cut grass and cutting the grass. Can be quickly buried without causing the attachment of mowing grass. Conversely, when the grass to be cut is dry and difficult to adhere lightly, the number of wind generators attached to the disc is reduced to reduce the increase in the load due to the installation of the wind generator, thereby reducing the discharge of cut grass and cutting between grasses. Burying can be performed satisfactorily while reducing the work load.
[0015]
〔effect〕
Therefore, it is possible to improve the economical efficiency in which the discharge operation and the mulching operation can be performed by replacing the blasting body, and it is possible to improve the workability more than performing the suitable mowing operation according to the state of the grass to be cut.
[0016]
〔Constitution〕
According to a third aspect of the present invention, in the first or second aspect, a closing body for closing the through hole is provided detachably with respect to the disk.
[0017]
[Action]
According to the above configuration, the number of through holes through which the airflow generated by the wind generator passes can be adjusted by attaching / detaching the closing body to / from the disk, and the generation of wind noise due to unnecessary through holes can be prevented.
[0018]
As a result, for example, when the grass to be cut is slightly wet and tends to adhere, for example, by reducing the number of closing bodies that block the through-holes and increasing the air flow rate through the through-holes, it is possible to discharge the cut grass and cut grass. Can be quickly buried without causing the attachment of mowing grass. Conversely, if the grass to be cut is dry and difficult to adhere lightly, the number of through-holes that block the through-holes and the number of through-holes that generate wind noise can be reduced to reduce the amount of cut grass and cut grass. The burial can be satisfactorily performed while reducing noise generated during work.
[0019]
In addition, when working capacity is emphasized at the time of work, by reducing the number of blockers that close the through hole and increasing the air flow rate through the through hole, the discharge of cut grass and the burial between grasses can be performed more quickly. Conversely, if the emphasis is on noise reduction during work, the number of through-holes that generate wind noise can be reduced by increasing the number of blockers that close the through-holes. The noise generated at times can be reduced.
[0020]
〔effect〕
Therefore, it is possible to perform a suitable mowing operation in accordance with the state of the grass to be cut, and also to achieve a superior workability because it is possible to easily switch between a work mode that emphasizes workability and a work mode that emphasizes noise reduction.
[0021]
〔Constitution〕
According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the position in which the through hole is opened by relative rotation of the drive shaft with respect to the disk around the axis of the drive shaft. And a closing body that can be adjusted in position between the closing position and the closing position.
[0022]
[Action]
According to the above configuration, by rotating the single closing body with respect to the disk, the size of each through hole through which the airflow generated by the wind generator passes can be adjusted at a stroke.
[0023]
As a result, for example, when the grass to be cut is slightly wet and easily adheres heavily, the amount of blockage of each through-hole by the blocking body is reduced to increase the air flow rate through each through-hole, thereby discharging the cut grass and cutting grass Can be quickly buried in the sewage without causing the attachment of the cut grass. Conversely, if the grass to be cut is dry and difficult to adhere lightly, the amount of blockage of each through-hole by the blocking body is increased to reduce the wind noise generated by each through-hole, so that the cut grass can be discharged or cut into the grass. Can be satisfactorily performed while reducing noise generated during work.
[0024]
In addition, when work capacity is emphasized during work, the amount of blockage of each through-hole by the blocking body is reduced to increase the air flow rate through each through-hole, so that the cut grass can be discharged and buried in the grass more quickly. Conversely, if emphasis is placed on noise reduction during work, the amount of blockage of each through-hole by the blocking body is increased to reduce wind noise generated by each through-hole, The noise generated at times can be reduced.
[0025]
〔effect〕
Therefore, while improving the operability when adjusting the opening degree of each through hole, it is possible to perform a suitable mowing operation according to the state of the grass to be mowed, and also emphasize a work form and a noise reduction in which a work ability is emphasized. The work mode can be easily changed, and the workability can be improved.
[0026]
〔Constitution〕
In the invention according to claim 5 of the present invention, in the invention according to any one of claims 1 to 4, the cutting blade is provided on an outer peripheral portion of the disk in parallel with the drive shaft. And the cutting blade is connected to a state allowing relative rotation of the cutting blade with respect to the disk around the axis of the supporting shaft, and the cutting is performed by centrifugal force accompanying rotation of the disk. The blade is configured to be maintained in a predetermined mowing posture for mowing while holding the grass to be mowinged on the disk side.
[0027]
[Action]
According to the above configuration, at the time of work, the cutting blade is maintained in the predetermined cutting posture, so that the grass to be cut can be reliably cut without escaping to the outside of the tip side of the cutting blade.
[0028]
Moreover, when the cutting blade comes into contact with a stone or the like, the cutting blade escapes around the axis of the support shaft in a direction against centrifugal force, and as a result, the cutting blade is damaged due to the contact with the stone or the like. Can be effectively suppressed. In most cases, even if the cutting blade is damaged, it can be dealt with only by replacing the damaged cutting blade.
[0029]
〔effect〕
Therefore, the mowing performance can be improved, and the durability and the maintainability can be improved.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an overall side view of the riding type mower, and FIG. 2 shows an overall plan view of the riding type mowing machine. A mower 4 is provided between a pair of left and right front wheels 2 of a caster type, which is arranged to be able to follow and steer, and a pair of right and left rear wheels 3, which are arranged as driving wheels at the rear of the traveling body 1. It has a mid-mount configuration.
[0031]
As shown in FIGS. 1 and 2, the traveling body 1 has a boarding operation unit 5 formed on the front side thereof, a driving unit 6 disposed on the rear side thereof, and the boarding operation unit 5 is provided in front of the main frame 7. Boarding step 8 laid on the rear side of the main frame 7, a driving seat 9 disposed on the rear side of the main frame 7, a shift lever 10 slidably mounted on the left and right sides of the driving seat 9, and a rear portion of the driving seat 9 on the main frame 7. It is formed from a fall protection frame 11 erected at a location.
[0032]
As shown in FIGS. 1 and 3, the driving unit 6 includes an engine 13 mounted on an engine frame 12 located behind the main frame 7, a transmission 14 disposed in a lower front portion of the engine 13, and right and left sides of the transmission 14. A transmission device for transmitting power from the engine 13 from a pair of hydrostatic continuously variable transmissions 15 provided with a distribution device, and left and right reduction gears 16 extending from the corresponding hydrostatic continuously variable transmission 15 to the left and right rear wheels 3. , And the power is distributed to the right and left traveling and working power in the transmission 14, and the right and left traveling power from the transmission 14 is shifted by the corresponding hydrostatic continuously variable transmission 15. Then, the power is transmitted to the corresponding left and right rear wheels 3 via the left and right reduction gears 16, and the working power from the transmission 14 is transmitted to the drive unit 18 of the mower 4 via the transmission shaft 17. Is constructed sea urchin.
[0033]
In the driving unit 6, the left and right reduction gears 16 are also used as a relay frame that connects the main frame 7 and the engine frame 12, and the transmission 14 and the pair of hydrostatic stepless transmissions 15 are connected to the relay frame. It is also used as an intermediate frame that connects the left and right reduction gears 16 that are also used.
[0034]
In the traveling body 1, the left and right shift levers 10 are linked to the corresponding hydrostatic continuously variable transmission 15, and when each of the left and right shift levers 10 is operated, the corresponding hydrostatic continuously variable shift is performed based on the operation. The device 15 is operated for independent shifting, and the power after each shifting is transmitted to the corresponding left and right rear wheels 3.
[0035]
That is, the traveling body 1 operates the left and right transmission levers 10 to independently operate the pair of hydrostatic continuously variable transmissions 15 to stop transmission to the left and right rear wheels 3. A straight traveling state in which the forward or reverse power at a constant speed is transmitted to the rear wheel 3, a gentle turning state in which different forward or reverse powers are transmitted to the left and right rear wheels 3, and a transmission to one of the left and right rear wheels 3. And a pivot turning state in which forward power or reverse power is transmitted to the other, and a spin turning state in which forward power is transmitted to one of the left and right rear wheels 3 and reverse power is transmitted to the other. Can appear.
[0036]
As shown in FIGS. 1 to 3, a left and right turning shaft 20 and a pair of left and right are mounted on a braking mechanism 19 built in each of the left and right reduction gears 16 at the front left and right central portions of the boarding step 8 in the traveling body 1. A single brake pedal 22 linked via a link rod 21 and the like, and a lock pedal 23 that enables the brake pedal 22 to be held at a braking position are provided adjacent to each other on the left and right sides. The brake operation by the left and right brake mechanisms 19 can be performed by the depressing operation, and the left and right brake mechanisms 19 can function as a parking brake by holding the brake pedal 22 in the braking position by the lock pedal 23. Can be.
[0037]
As shown in FIGS. 1, 2, and 4 to 7, the mower 4 includes three blades 26 for mowing in a housing 25 supported by the main frame 7 so as to be vertically movable via a link mechanism 24. Is driven to rotate at a constant speed around the axis thereof by a corresponding driving power shaft 27 by the working power transmitted to the driving unit 18, and a part of the rotation trajectory is viewed in the front-rear direction. The rotation direction is set so that the left blade 26 moves rearward and the right blade 26 moves forward at each overlapping portion, and the right and left blades 26 are arranged side by side. It is constituted by.
[0038]
As shown in FIG. 2 and FIGS. 4 to 7, the housing 25 is opened at its lower part and formed with a discharge port 28 at the right end. A so-called side discharge operation is performed in which the cut grass is guided to a discharge path 30 provided on the front side of the housing 25 by an air current generated by the rotation of each blade 26 and discharged from the discharge port 28 to the outside of the machine. In the state (see FIG. 4 and FIG. 6), the grass mowed by each blade 26 is shredded by each blade 26 by an air current generated by the rotation of each blade 26, and buried in the grass below the housing 25. It is configured to be easily changed to a state in which a so-called mulching operation is performed (see FIGS. 5 and 7).
[0039]
As shown in FIGS. 4 to 9, each blade 26 has a disk 31 connected to a corresponding drive shaft 27 around its axis, and a certain distance in the circumferential direction at the outer peripheral portion of the disk 31. And four cutting blades 32 connected and mounted so as to extend outward from the outer periphery thereof, and at a position spaced apart from the respective cutting blades 32 of the disk 31 by a predetermined distance on the upper side in the rotation direction of the blade 26. A disk 31 having a disk 31 on its rotation center side is formed by four wind wings 33 and the like connected and extended from the outer periphery to the outside, and the corresponding drive shaft 27 and its corresponding It rotates integrally around the axis.
[0040]
Each disc 31 has four through-holes 34 spaced at a fixed interval in the circumferential direction, four blast bodies 35 bulging in the vertical direction at positions adjacent to the through-holes 34 on the upper side in the rotational direction, and each cutting blade 32. , And two connection holes 37 for each wind wing 33 are formed, and with the rotation, each wind generator 35 generates an airflow passing through the corresponding through hole 34. . The disc 31 includes a disc for discharge work and a disc for mulching work. The disc 31A for discharge work has an upward direction having a direction from the lower surface side to the upper surface side as the disk 31 rotates. Each blowing member 35 is formed to bulge downward so as to generate an air flow (see FIGS. 4, 6 and 8). On the contrary, the mulching work disk 31B is rotated from its upper surface to its lower surface. Each wind generator 35 is formed so as to bulge upward so as to generate a downward airflow having a direction toward the side (see FIGS. 5, 7 and 9).
[0041]
Each of the cutting blades 32 is formed in a regular triangular shape having a blade portion 38 on each side, and four screw holes 39 for allowing attachment to the disc 31 are formed in the center thereof. By changing the screw hole 39 corresponding to the hole 36, the blade portion 38 to be used can be selected from the three blade portions 38, and when the blade portion 38 in use is damaged due to contact with a stone or the like during work. Needless to say, the disk 31 and the wind wings 33 can be dealt with without changing the cutting blade 32 simply by changing the mounting posture of the cutting blade 32 with respect to the disk 31 by 120 degrees.
[0042]
Each of the wind wings 33 is provided with two screw holes 40 at one end thereof to enable attachment to the disk 31, and at the other end thereof, a wind generating section for generating an upward airflow with its rotation. 41 is bent. If the wind wing 33 is damaged due to contact with a stone or the like during work, it is possible to cope with the damage only by changing the damaged wind wing 33 without replacing the disk 31 or the cutting blade 32.
[0043]
From the above configuration, when performing the side discharge operation, as shown in FIGS. 4 and 6, the housing 25 is changed to the side discharge operation, and each blade 26 is equipped with a disk 31A for the discharge operation. If used, at the time of operation, as each blade 26 rotates about the axis of the drive shaft 27, each cutting blade 32 moves the grass to be cut at a radially outer portion of the disk 31 in the housing 25. And the wind wings 33 generate an upward airflow so that the grass to be cut is erected in a state where it can be easily cut by the cutting blade 32, and the cut grass is guided to the discharge path 30 of the housing 25. Each of the disks 31A suppresses the generation of wind noise on the rotation center side of the blade 26, An upward air flow is caused by Futei 35, so to facilitate the discharge of the outside from the discharge port 28 of the cut grass.
[0044]
Further, when performing the mulching operation, as shown in FIGS. 5 and 7, the housing 25 is changed to the mulching operation, and the blades 26 using the disks 31B for the mulching operation are used. Occasionally, as each blade 26 rotates about the axis of the drive shaft 27, each cutting blade 32 acts on the grass to be cut which is located radially outward of the disk 31 in the housing 25 and cuts. The respective wind wings 33 generate an upward airflow to raise the grass to be cut to a state where cutting can be easily performed by the cutting blade 32, and guide the cut grass to the upper side of the housing 25. The generation of wind noise on the rotation center side of the blade 26 is suppressed, and the grass in the housing 25 is penetrated by the downward airflow generated by each wind generator 35. So it is buried in Kusama at the bottom of the housing 25 through the holes 34.
[0045]
In other words, when the side discharge operation is performed, the mower 4 is provided with the disk 31A for the discharge operation, and the mower 4 is excellent in workability in which the grass can be discharged more efficiently while reducing noise generated during the operation. When performing mulching work, the mulching work is equipped with a disc 31B for mulching work, so that while reducing noise generated at the time of work, the mowing can be satisfactorily performed between grasses under the housing 25. The workability that can be buried is excellent.
[0046]
[Another embodiment]
Hereinafter, another embodiment of the present invention will be exemplified.
[0047]
[1] The disc-shaped blade 26 may be employed in the mower 4 including the housing 25 dedicated to the side discharge operation, or may be employed in the mower 4 including the housing 25 dedicated to the mulching operation. The mower 4 for discharging the grass through a discharge port 28 formed at the rear end of the rear mower 4 may be employed.
[0048]
[2] The number and arrangement of the through holes 34 formed in the disk 31 can be variously changed, and the numbers and arrangement of the cutting blades 32 and the wind wings 33 provided in the disk 31 can also be variously changed. .
[0049]
[3] As shown in FIGS. 10 and 11, each disk 31 is fully opened at a position where each through hole 34 is opened by a rotation operation of the drive shaft 27 with respect to the disk 31 around the axis. )] And a fully-closed position (see FIG. 11 (b)) for closing, a cross-shaped closing member 42 whose position can be adjusted, and an arc-shaped long hole 43 starting from the axis of the drive shaft 27. And a nut 44 for fixing the closing member 42 at a desired rotation position with respect to the disk 31 on the screw shaft 44 by erecting a screw shaft 44 inserted into the long hole 43 in the closing member 42. 45 may be screwed.
[0050]
According to this configuration, by simply performing the screwing operation of the nut 45 on the screw shaft 44 and the rotating operation of the single closing body 42 with respect to the disk 31, each through-hole through which the airflow generated by each wind generator 35 passes. 34 can be adjusted at once.
[0051]
Further, for example, when the grass to be cut is slightly wet and easily adheres heavily, if the amount of closing of each through-hole 34 by the closing body 42 is reduced to increase the air flow rate through each of the through-holes 34, it is possible to reduce And the burial of the cut grass during the mulching operation can be quickly performed without causing attachment of the cut grass. Conversely, in the case where the grass to be cut is dry and hard to adhere lightly, if the amount of closing of each through hole 34 by the closing body 42 is increased to suppress the generation of wind noise in each through hole 34, the discharge work may be performed. Discharge of cut grass and burial of cut grass during mulching work can be performed satisfactorily while reducing noise generated during work.
[0052]
Further, when the work capacity is emphasized during the work, if the amount of closing of each through-hole 34 by the closing body 42 is reduced to increase the air flow rate through each through-hole 34, the discharge of the cut grass during the discharge work, or In the mulching work, the cut grass can be buried between the grasses more quickly and efficiently. Conversely, in the case where noise reduction is emphasized during work, if the amount of closing of each through hole 34 by the closing body 42 is increased to suppress the generation of wind noise in each through hole 34, noise generated during work may be reduced. Can be reduced.
[0053]
In other words, while improving the operability when adjusting the opening degree of each through hole 34, it is possible to perform a suitable mowing operation according to the state of the grass to be mowed, and to reduce the work form and the noise in which the working ability is emphasized. The workability can be improved because the work mode to be emphasized can be easily switched.
[0054]
The shape of the closing member 42 can be variously changed according to the number and arrangement of the through holes 34 formed in the disk 31. Alternatively, a pair of the long hole 43, the screw shaft 44, and the nut 45 may be provided, and they may be arranged at point symmetrical positions around the axis of the drive shaft 27.
[0055]
As shown in FIG. 12, instead of the long hole 43, the screw shaft 44, and the nut 45, the closing body 42 is provided with a desired rotation with respect to the disk 31 at the center of the disk 31 and the closing body 42 on the facing surface side. The chrysanthemum seat-shaped engaging portions 46 and 47 for engaging and holding at the moving position are provided, and the closing member 42 is rotated with respect to the disk 31 by screwing a bolt 48 connecting the disc 31 and the closing member 42 to the drive shaft 27. The configuration may be such that the state can be switched between a state where operation is enabled and a state where operation is disabled.
[0056]
[4] As shown in FIG. 13, screw holes 49 are formed on both sides of each through hole 34 in the radial direction of the disk 31, and an insertion hole 50 corresponding to the screw hole 49 is formed in each wind generator 35. Separately formed into a shape having a flange 51 formed and a bulging portion 52 bulging out of the flange 51, and each wind generator 35 is disposed on the disk 31 with respect to an adjacent portion on the upstream side in the rotation direction with respect to each through hole 34. You may comprise so that attachment or detachment is possible.
[0057]
According to this configuration, each wind generator 35 mounted on the disk 31 covers the upper side in the rotational direction of the corresponding through hole 34 from below, and the through hole of the disk 31 has a directionality from below to above the disk 31. The airflow passing through the through hole 34 of the disk 31 is generated so as to cover the upper side in the rotational direction of the corresponding through hole 34 from above and generate the airflow passing through the through hole 34 of the disk 31 from above to below. It is possible to change the state to a state in which the disk 31 is changed, and to adjust the number of the wind generators 35 mounted on the disk 31.
[0058]
As a result, the specifications of the disc 31 can be easily changed to the disc 31A for the discharge work and the disc 31B for the mulching work only by changing the respective wind generators 35 to the disc 31. Further, for example, when the grass to be cut is slightly wet and easily adheres heavily, if the number of the wind generators 35 mounted on the disk 31 is increased to increase the air flow generated by the wind generator 35, the grass cut at the time of the discharge operation is cut. And the burial of the cut grass during the mulching operation can be quickly performed without causing attachment of the cut grass. Conversely, when the grass to be cut is dry and hard to adhere lightly, if the number of the wind-up bodies 35 mounted on the disc 31 is reduced to reduce the increase in the load due to the mounting of the wind-up bodies 35, the cut grass can be removed during the discharge operation. It is possible to satisfactorily discharge and bury the cut grass between the grasses during the mulching operation while reducing the work load.
[0059]
In other words, by replacing each blasting body 35, it is possible to provide an excellent economical work that can cope with the discharge work and the mulching work, and also to provide a more excellent workability that can perform a suitable mowing operation according to the state of the grass to be cut. it can.
[0060]
[5] As shown in FIG. 14, in the blade 26 illustrated in the above-mentioned another embodiment [4] in which each blowing member 35 is detachably provided to the disk 31, a closing member 53 that closes the through hole 34. May be provided detachably with respect to the disk 31.
[0061]
As shown in FIG. 14A, the closing body 53 has a circular shape that covers the through-hole 34 and has a pair of insertion holes 54 formed on the outer periphery thereof corresponding to the screw holes 49 of the disk 31. Alternatively, as shown in (b) of FIG. 14, a circular closing portion 55 that fits in the through hole 34 and a pair of connecting portions 56 in which the insertion holes 54 corresponding to the screw holes 49 of the disc 31 are formed. It may be provided.
[0062]
According to this configuration, by attaching and detaching the closing body 53 to and from the disk 31, the number of through holes 34 through which the airflow generated by the wind generator 35 passes can be adjusted, and the generation of unnecessary wind noise by the through holes 34 can be prevented.
[0063]
As a result, for example, when the grass to be cut is slightly wet and easily adheres to the grass, if the number of the closing bodies 53 to be replaced with the blasting body 35 is reduced to increase the air flow rate through the through-hole 34, the cut grass can be discharged during the discharge operation. Discharge and burial of the cut grass between the grasses during the mulching operation can be performed promptly without causing attachment of the cut grass. Conversely, when the grass to be cut is dry and hard to adhere lightly, the number of the closing bodies 53 to be replaced with the blasting body 35 is increased to reduce an increase in load due to the mounting of the blasting body 35 and generate wind noise. If the number of the through holes 34 is reduced, it is possible to discharge the cut grass during the discharging work, and to bury the cut grass between the grasses during the mulching work while reducing the work load and reducing the noise generated during the work.
[0064]
In addition, when the work capacity is emphasized at the time of work, if the number of the closing bodies 53 to be replaced with the blowing body 35 is reduced and the air flow rate through the through hole 34 is increased, the discharge of the cutting grass at the time of the discharge work and the mulching are performed. During work, the grass can be buried in the grass more quickly. Conversely, when emphasis is placed on noise reduction and load reduction during work, the number of closing bodies 53 to be replaced with the wind generator 35 is increased. If the increase in the load due to the mounting of the wind generator 35 is reduced and the number of the through holes 34 that generate the wind noise is reduced, the noise generated during the work and the work load can be reduced.
[0065]
In other words, in addition to being able to perform a suitable mowing operation according to the state of the grass to be mowed, the workability is more excellent than the work mode that emphasizes the work ability and the work mode that emphasizes the reduction of noise and the load can be easily switched. Can be something.
[0066]
In addition, a closing member 53 that can be attached to and detached from the disk 31 may be provided on the blade 26 including the disk 31 on which each of the wind generators 35 is integrally formed.
[0067]
[6] As shown in FIG. 15, the connection holes 36 and 37 of the disk 31 are formed as long holes that allow the lengths of the respective cutting blades 32 and the wind wings 33 to extend from the disk 31. You may.
[0068]
[7] The disk 31 may be equipped with a cutting blade 32 and a wind wing 33 integrally formed.
[0069]
[8] As shown in FIG. 16, each cutting blade 32 is provided on the outer peripheral portion of the disk 31 via a support shaft 57 provided in parallel with the drive shaft 27, around the axis of the support shaft 57. And the centrifugal force caused by the rotation of the disc 31, the center of the disc 31, the center of gravity 32A of the cutting blade 32, and the axis of the support shaft 57 are connected. The blade 26 may be configured such that in a state of being aligned on a straight line, the respective cutting blades 32 are maintained in a predetermined cutting posture in which the cutting target grass is cut while holding the grass to be cut on the disk 31 side.
[0070]
According to this configuration, at the time of work, the respective cutting blades 32 are maintained in a predetermined cutting posture by centrifugal force, so that the grass to be cut can be reliably cut without escaping to the outside of the tip side of each cutting blade 32.
[0071]
In addition, when each cutting blade 32 comes into contact with a stone or the like, the cutting blade 32 escapes around the axis of the support shaft 57 in a direction against centrifugal force, and as a result, each cutting blade 32 comes into contact with the stone or the like. Damage to the cutting blade 32 can be effectively suppressed. Even if the cutting blade 32 is damaged, it can be dealt with only by replacing the damaged cutting blade 32 only.
[0072]
That is, the mowing performance can be improved, and the durability and the maintainability can be improved.
[0073]
FIG. 16A illustrates the blade 26 adopting the curved cutting blade 32 in which the blade portion 38 is formed in the curved concave portion, and FIG. 16B illustrates a straight line on one side. The blade 26 adopting a strip-shaped cutting blade 32 having a blade-like blade 38 is illustrated.
[0074]
Also, as shown in FIG. 17, a plurality of protrusions 58 protruding upward are formed on the outer peripheral portion of the disk 31, and a pair of bulging portions bulging outward at the swing fulcrum of each cutting blade 32. When the corresponding projections 58 and the pair of bulging portions 59 are in contact with each other, the respective cutting blades 32 swing over a predetermined cutting posture and a storage posture in a region on the upper side in the rotation direction of the disk 31. Thus, the swinging area of each cutting blade 32 with respect to the disk 31 may be restricted.
[Brief description of the drawings]
FIG. 1 is an overall side view of a riding type mower.
FIG. 2 is an overall plan view of a riding type mower.
FIG. 3 is a plan view showing a frame structure of the traveling body.
FIG. 4 is a cross-sectional plan view of a mower whose specifications are changed for a side discharge operation.
FIG. 5 is a cross-sectional plan view of a mower modified for mulching work.
FIG. 6 is a longitudinal sectional side view of a mower whose specifications have been changed for side discharge work.
FIG. 7 is a longitudinal sectional side view of a mower modified for mulching work.
FIG. 8 is a partially exploded perspective view showing the configuration of a discharge work disk.
FIG. 9 is a partially exploded perspective view showing the configuration of a mulching work disk.
FIG. 10 is an exploded perspective view of a main part showing another embodiment provided with a cross-shaped closing body.
FIG. 11A is a plan view of a main part showing a fully opened state in another embodiment in which a cross-shaped closing body is provided.
(B) A plan view of a main part showing a fully closed state in another embodiment provided with a cross-shaped closing body.
FIG. 12 is an exploded perspective view of a main part showing another embodiment in which a chrysanthemum seat-like engaging portion is provided between a disc and a cross-shaped closing body.
FIG. 13 is an exploded perspective view of a main part showing another embodiment in which a wind generator is detachably provided on a disk.
FIG. 14 is an exploded perspective view of a main part showing another embodiment provided with a detachable closing body.
FIG. 15 is an exploded perspective view of a main part showing another embodiment in which the extension lengths of the cutting blade and the wind wing are adjustable.
FIG. 16 is a plan view of a main part showing another embodiment in which a cutting blade is swingably mounted.
FIG. 17 is a plan view of a main part showing another embodiment in which a cutting blade is equipped so as to be swingable within a predetermined swing range.
[Explanation of symbols]
27 Drive shaft
31 disks
32 Cutting Blade
34 Through hole
35 Windbreak
42 Closure
53 Closure
57 spindle

Claims (5)

A disk having a drive shaft as a center and a cutting blade for mowing grass at a radially outer portion of the disk are provided so as to rotate integrally around the axis of the drive shaft, and a plurality of through holes are formed in the disk. A disk-shaped blade provided with a plurality of wind generators for generating an airflow passing through the through hole as the disk rotates. The disk-shaped blade according to claim 1, wherein the wind generator is detachably provided to the disk. The disk-shaped blade according to claim 1, wherein a closing member that closes the through hole is provided detachably with respect to the disk. 3. The disk type according to claim 1, further comprising a closing body that can be adjusted in position between a position where the through hole is opened and a position where the through hole is closed by relative rotation of the drive shaft around the axis with respect to the disk. blade. On the outer periphery of the disk, the cutting blade is allowed to swing relative to the disk around the axis of the support shaft through a support shaft arranged in parallel with the drive shaft. The cutting blade is configured to be maintained in a predetermined cutting posture in which the cutting blade is held by the centrifugal force caused by the rotation of the disc and the grass is cut while holding the grass to be cut on the disc side. Item 6. A disk-shaped blade according to any one of Items 1 to 4.

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