JP4183647B2 - Moore - Google Patents

Description

  The present invention relates to a mower in which a blade is provided inside a housing so that the blade can be driven and rotated by a rotating support shaft that is vertically oriented.

  In the above mower, conventionally, as shown in, for example, Japanese Patent Application No. 2002-289924 filed by the present applicant, there has been a sheet-like damping material pasted on the inner surface side of the housing.

  In the mower, noise increases due to wind noise caused by the rotating blade. When reducing the noise with a sound absorbing material such as urethane foam, adopting the above technology that is attached to the inner surface of the housing tends to make the discharge path of the cut grass and cut grass in the housing narrow due to the sound absorbing material. . The sound absorbing material tends to be bulky as compared with the vibration damping material, and particularly when the noise reduction is effectively achieved, the bulk becomes remarkably high and the discharge passage becomes narrow. .

  An object of the present invention is to provide a mower capable of reducing noise with a sound-absorbing material while avoiding the occurrence of the above problems.

In the first aspect of the invention, in the mower in which the blade is provided in the housing so that the blade can be driven and rotated by the rotary support shaft in the vertical direction of the fuselage.
Provided on the upper side of the blade mounting portion of the rotating spindle provided inside the housing is a cover containing therein a cylindrical sound absorbing material positioned around the rotating spindle ,
The cover includes a cylindrical cover main body along the entire circumference of the sound absorbing material, and a connecting plate portion connected to a lower end portion of the cover main body, and the cover is configured separately from the blade. The cover is supported by the rotary spindle so as to be rotatable together, and a through-hole for sound absorption is provided in the cover body .

  That is, the cut grass and the cut grass are transferred through the housing by the wind generated by the rotation of the blade, and are discharged without passing through the vicinity of the rotation support shaft of the blade. Since the sound absorbing material is provided around the rotating spindle of the blade, the sound absorbing material does not enter the discharge passage of the cut grass or the cut grass and the discharge passage is not narrowed. It is possible to reduce the noise that the sound wave of sound is absorbed by the sound absorbing material and goes out of the housing.

  Therefore, according to the first aspect of the present invention, the cut grass and the cut grass can flow smoothly without being disturbed by the sound absorbing material while being able to reduce the noise by the sound absorbing material and work as quietly as possible. It will be discharged out of the housing.

  That is, even if stones or the like jumps in the housing, the sound absorbing material will not be damaged because it does not hit the sound absorbing material due to the cover or is difficult to hit.

Therefore, according to the first aspect of the present invention, the sound-absorbing material is rich in durability so that the sound-absorbing material is not broken or damaged even if stones or the like jump in the housing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 1, a pair of left and right steering and drive front wheels 1, a pair of left and right drive rear wheels 2, and a drive having an engine 3. , A driving part equipped with a driving seat 4 located behind the driving part, and a driving force from the engine 3 is converted into a forward driving force and a backward driving force by a hydrostatic continuously variable transmission (not shown). At the same time, on both the forward side and the reverse side, the mower is connected between the front and rear wheels of the body frame 6 of the self-propelled vehicle body, which is provided with a travel drive device 5 that transmits continuously to the front and rear wheels 1 and 2. 10 is configured to transmit power from the power take-out shaft 5a of the travel drive device 5 to the input shaft 21 of the mower 10 via the rotary shaft 8, thereby constituting a riding mower.

  That is, when the rear link 7a of the link mechanism 7 is swung up and down by a lift cylinder (not shown), the link mechanism 7 is moved up and down to bring the mower 10 into contact with the gauge ring 11 on the ground. Then, the gauge wheel 11 is moved up and down to the non-working state in which the gauge wheel 11 is lifted from the ground. When the mower 10 is in the descending work state and the self-running vehicle body is driven, the mower 10 performs mowing and lawn mowing processing with the blade 13 positioned inside the housing 12.

  More specifically, as shown in FIGS. 3, 4, and 5, the mower 10 includes a top plate 12 a, a side wall plate 12 b continuously provided around the top plate 12 a, and an inner surface side of the top plate 12 a. The housing 12 having the vacuum plate 12c and the like provided continuously, the blades 13 provided at a plurality of locations arranged in the horizontal direction of the machine body inside the housing 12, and the drive provided on the upper surface side of the top plate 12a of the housing 12 A mechanism 20 is provided.

  As shown in FIG. 4 and the like, each of the blades 13 includes a spindle holder 14 that is bolted to the top plate 12 a, a spindle holder 14 that is rotatably inserted, and a lower end side that is intermediate to the blade 13. It is rotatably supported on the top plate 12a via a vertical support shaft 15 which is connected to the body so as to be freely rotatable.

  As shown in FIGS. 2 and 4, the drive mechanism 20 includes an input / transmission case 22 having the input shaft 21 rotatably, and a blade located in the center of the plurality of blades 13 in the lateral direction of the fuselage. 13, the rotating support shaft 15 and the input shaft 21 are linked to each other, and a bevel gear mechanism 23 provided inside the input / transmission case 22, and the top plate of the rotating support shaft 15 of each blade 13. The belt pulley 24 is rotatably connected to a portion located on the upper surface side of the 12a, and the transmission belt 26 is wound around a guide / tension pulley 25 provided on the upper surface side of the top plate 12a.

  As shown in FIG. 4, a sound-absorbing urethane foam 30 and a cover 31 for accommodating the sound-absorbing urethane foam 30 are provided at a portion that supports the blade 13 located in the center of the machine body inside the housing 12.

  The sound-absorbing urethane foam 30 is configured in a cylindrical shape that is externally fitted to the support shaft holder 14 so as to be positioned over the entire periphery of the rotation support shaft 15 of the blade 13. The cover 31 includes a cylindrical cover main body 31a and a connecting plate portion 31b that is connected to the lower end portion of the cover main body 31a and has a support shaft hole 32 through which the rotation support shaft 15 is inserted. The connecting plate portion 31b is supported by the rotating support shaft 15 so as to be integrally rotatable by being tightened and connected to the rotating support shaft 15 together with the blade 13. Further, by accommodating the sound absorbing foamed urethane 30 in the cover main body 31a, the sound absorbing foamed urethane 30 is covered over the entire periphery thereof. The cover body 31a of the cover 31 is provided with a plurality of through holes 33 arranged in the vertical direction and the circumferential direction of the cover body 31a. Each through-hole 33 makes it easy for sound waves of wind noise generated due to the rotating blade 13 to enter the sound absorbing foamed urethane 30. Even if a cover 31 having a size that allows the outer diameter D1 of the cover body 31a to be about 2/3 of the outer diameter D2 of the blade 13 is employed, cutting by the wind generated by the blade 13 is performed. Can carry grass and cut grass without any trouble.

  A sound absorbing foamed urethane 30 and a cover 31 for accommodating the sound absorbing foamed urethane 30 are also provided at a portion supporting the outer blade 13 other than the blade 13 at the center of the machine body. The sound absorbing foam urethane 30 and the cover 31 corresponding to the outer blade 13 are also configured in the same manner as the sound absorbing foam urethane 30 and the cover 31 corresponding to the central blade 13, and the sound absorbing foam urethane 30 and the cover 31 corresponding to the outer blade 13 A detailed description of the cover 31 is omitted.

  As a result, the mower 10 transmits the driving force transmitted from the engine 3 to the input shaft 21 via the travel drive device 5 and the rotary shaft 8 to the rotary support shaft 15 of the blade 13 at the center of the machine body via the bevel gear mechanism 23. The rotary support shafts 15 are transmitted to the rotation support shafts 15 of the other blades 13 via the transmission belts 26 to drive the rotation support shafts 15, and the rotation support shafts 15 connect the blades 13 to the rotation support shafts 15. The blades 13 are cut to cut grass and turf. While the sound wave of the wind noise generated by each rotating blade 13 is absorbed by the sound absorbing foamed urethane 30, wind is generated by the wind-generating fins 13a of each blade 13, and the cut grass and the cut grass are removed from the housing 12 by this wind. Is flowed toward a discharge port 16 as shown in FIGS. 2 and 3 located on the side of the housing 12 and discharged from the discharge port 16 to the outside of the housing 12. Further, even if stones or the like jump inside the housing 12 due to the rotating blade 13, the cutting process is performed while avoiding the cover 31 from hitting the sound absorbing foamed urethane 30.

[Another embodiment]
The object of the present invention can be achieved even if a sound-absorbing cork, a sound-absorbing cotton, or the like is used instead of the sound-absorbing urethane foam 30. It is called.

Side view of the entire riding mower Moor's top view Moor's bottom view Cross section of moor's central blade placement

Explanation of symbols

12 Housing 13 Blade 15 Rotating spindle 30 Sound absorbing material 31 Cover

Claims (1)

A mower in which a blade is provided in a housing so as to be able to be driven and rotated by a rotating support shaft that is directed upward and downward.
Provided on the upper side of the blade mounting portion of the rotating spindle provided inside the housing is a cover containing therein a cylindrical sound absorbing material positioned around the rotating spindle ,
The cover includes a cylindrical cover main body along the entire circumference of the sound absorbing material, and a connecting plate portion connected to a lower end portion of the cover main body, and the cover is configured separately from the blade. A mower that is supported by the rotary spindle so as to be integrally rotatable, and a sound absorption through hole is provided in the cover body .

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