JP3824560B2 - Moore - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a plurality of through holes are formed in a deck of a cutting blade housing, a pulley is provided at an upper portion, and a driving shaft provided with a cutting blade and a breezing blade at a lower portion is rotatably supported around a longitudinal axis. Each of the plurality of bearing bosses is attached to the cutting blade housing via a flange portion attached to the bottom surface of the deck around the through hole, and the pulley is supported above the through hole. A belt-type power transmission mechanism is provided that wraps a power transmission belt on the upper surface side of the deck and rotates the drive shafts in conjunction with each other, and the cutting blade is cut by the conveying wind generated by the wind blades of the cut grass cut by the cutting blade. The present invention relates to a mower configured to be discharged to the outside of a housing.
[0002]
[Prior art]
In the above mower, conventionally, a plurality of through holes are formed on the deck in a shape smaller than the outer shape of the pulley provided on the upper portion of the drive shaft, and each of the bearing boss portions provided with the flange portions for attachment is provided around the through holes. Attached to the cutting blade housing via flanges attached to the bottom surface of the deck, supported pulleys above the through holes, wound a transmission belt on the top surface of the deck across each pulley, and linked the drive shafts to each other. A belt type transmission mechanism is provided.
[0003]
[Problems to be solved by the invention]
Therefore, it is necessary to secure a sufficient clearance between the lower surface of the pulley and the upper surface of the deck so that the pulley supported above the through hole does not come into contact with the deck. When the support height from the upper surface is increased, the protrusion height of the belt-type transmission mechanism from the upper surface of the deck is increased, and the mower is supported by the traveling machine body so that it can freely move up and down according to the undulation of the traveling surface. Has the disadvantage of becoming narrower.
Also, the bearing boss part is attached to the cutting blade housing together with the drive shaft provided with the pulley, so that the through hole is formed in a shape smaller than the outer shape of the pulley, so as to improve the assembly efficiency of the pulley. With the pulley removed from the drive shaft, the bearing boss must be attached to the cutting blade housing from the bottom of the deck, and the pulley must be assembled separately from the top of the deck to the drive shaft. There is.
The present invention has been made in view of the above circumstances, so that the protruding height of the belt-type transmission mechanism from the deck upper surface can be reduced, and in addition, the pulley assembly efficiency can be improved. The purpose is to do.
[0004]
[Means for Solving the Problems]
According to a first aspect of the present invention, a plurality of through-holes are formed in a deck of a cutting blade housing, a pulley is provided at an upper portion, and a drive shaft provided with a cutting blade and a wind vane at a lower portion is a vertical axis. Each of a plurality of bearing boss portions that are rotatably supported around the core is attached to the cutting blade housing via a flange portion attached to the bottom surface of the deck around the through hole, and the pulley is disposed above the through hole. A belt-type transmission mechanism is provided to support and wrap a transmission belt on the upper surface side of the deck across the pulleys to rotate the drive shafts in an interlocked manner, and the mowing grass cut by the cutting blade is raised by the wind blades. The mower is configured to be discharged to the outside of the cutting blade housing by the transported air, and a communication hole that communicates the inside and outside of the cutting blade housing through the through hole is formed in the flange portion. Hole, In center direction as viewed lies in that is formed by the shape larger than the outer shape of the pulley.
[0005]
[Action and effect]
When the cutting blade housing is brought close to the ground so that the cutting height is low, the gap between the outer peripheral portion of the cutting blade housing and the ground becomes narrow, and it becomes difficult for air to flow into the cutting blade housing. Regardless of the drive, there is a risk that the conveying air cannot be generated with a sufficient air flow and the cut grass cannot be discharged outward from the blade housing. However, the communication that connects the inside and outside of the blade housing through the through hole formed in the deck is possible. Since the hole is formed in the flange, even if the gap between the outer periphery of the cutting blade housing and the ground becomes narrow and it is difficult for air to flow into the cutting blade housing, the through hole and flange formed in the deck Thus, air can flow into the cutting blade housing through the communication hole formed in the upper portion, so that the conveying wind can be generated, and there is little possibility that the cut grass cannot be discharged outward from the cutting blade housing.
And since the through hole is formed in the deck in a shape larger than the outer shape of the pulley in the axial direction view, so that the pulley is close to the top surface of the deck, or a part of it enters the through hole. Even if it is installed on the top of the drive shaft and supported above the through hole, there is no risk of the pulley coming into contact with the deck. The protruding height can be lowered. In addition, since the through hole is formed in a shape larger than the outer shape of the pulley, the drive shaft provided with the pulley at the top is supported by the bearing boss portion, and the bearing boss portion is connected to the top surface of the deck through the pulley. It can be attached to the cutting blade housing from the lower surface side of the deck while entering, and the efficiency of assembly of the pulley can be improved.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a mower M of a mid-mount riding lawn mower mounted between front and rear wheels of a traveling machine body. The mower M has a cutting blade housing in which the lower surface side of the deck 1 is surrounded by an outer peripheral wall 2. 3, a three-cutting blade type mower in which three cutting blades 4 rotating around the vertical axis X are installed inside, and at the center of the upper surface of the deck of the cutting blade housing 3, A bevel gear case 6 having an input shaft 5 to which power is transmitted from is fixed, and a bevel gear mechanism 7 provided in the bevel gear case 6 and a belt-type transmission mechanism 8 provided on the upper surface of the deck. The three blades 4 integrally formed with the wind-up blades 9 are configured to be driven and rotated.
[0007]
That is, as shown in FIGS. 2 and 3, the first first bearing boss in the center in which the three through holes 10 are formed in a substantially circular shape in the deck 1 of the cutting blade housing 3 and the mounting flange portion 11 is integrally formed. Each of the three bearing boss portions 12 of the portion 12A and the left and right second bearing boss portions 12B is substantially concentric with the through hole 10 via a flange portion 11 which is bolted to the bottom surface of the deck around the through hole 10. A cutting blade drive shaft 14 that is attached to the cutting blade housing 3, has a pulley 13 at the top, and has a cutting blade 4 integrally formed with the wind-up blades 9 at the bottom is connected to each bearing boss portion 12 with a vertical axis. Each pulley 13 is supported above the through hole 10 so as to be rotatable around X.
[0008]
As shown in FIG. 2, the first bearing boss portion 12A has its flange portion 11A fixed to the deck 1 with bolts 25 together with a stay 24 fixed to the bevel gear case 6 with bolts 25, and the upper end of the boss 15A. Is positioned at substantially the same height as the upper surface of the deck, and the first cutting blade drive shaft 14A is rotatably supported, and the grease injection path 26 is formed in the flange portion 11A in a direction perpendicular to the longitudinal axis X. A grease nipple 27 communicating with the grease injection path 26 protrudes above the deck 1 so that grease can be injected between the first bearing boss portion 12A and the first cutting blade drive shaft 14A.
[0009]
Each of the second bearing boss portions 12B, as shown in FIG. 3, has the upper end of the boss 15B protruding upward from the upper surface of the deck, and rotatably supports the second cutting blade drive shaft 14B. A notch 28 for injecting grease is formed in the peripheral portion of the through hole 10, and a grease injection path 29 is formed obliquely in the flange portion 11 </ b> B so as to open to the notch 28, and communicates with the grease injection path 29. The grease nipple 30 that protrudes above the deck 1 can be injected between the second bearing boss portion 12B and the second cutting blade drive shaft 14B.
[0010]
The bevel gear mechanism 7 includes a drive-side bevel gear 16 attached to the input shaft 5 and a passive-side bevel gear 17 attached to the first cutting blade drive shaft 14A as an output shaft. The bevel gear mechanism 7 includes a pair of front and rear bearings (not shown). ) In the bevel gear case 6 so as to be rotatable around the horizontal axis Y, and the first cutting blade drive shaft 14A is composed of a bearing 19 provided in the bevel gear case 6 and a bearing 20 attached to the first bearing boss portion 12A. It is supported so as to be rotatable around the vertical axis X.
[0011]
Then, two transmission belts 21 are wound on the deck upper surface side over the first pulley 13A attached to the first cutting blade drive shaft 14A and the second pulley 13B attached to the left and right second cutting blade drive shafts 14B. The belt-type transmission mechanism 8 that interlocks and rotates the three cutting blade drive shafts 14 is provided, and the central cutting blade 4A and the left and right cutting blades 4B are driven and rotated in the same direction together with the wind-up blades 9, The grass cut by the cutting blade 4 can be discharged from the discharge port 22 provided in the lateral side portion of the cutting blade housing 3 to the outside of the traveling machine body by the conveying wind generated by the wind-up blade 9.
[0012]
Further, each of the through holes 10 is formed in a shape larger than the outer shape of the pulley 13 (13A, 13B) supported above the shaft 10 as viewed in the axial direction, that is, a larger diameter than the outer diameter of the pulley 13. Then, the pulleys 13 are supported close to the top surface of the deck, and the communication holes 23 communicating with the inside and outside of the cutting blade housing 3 through the through holes 10 are formed in the flange portion 11B of the second bearing boss portion 12B in FIG. As illustrated, the flange portions 11 of the bearing boss portions 12 are formed at intervals in the circumferential direction.
[0013]
[Other Embodiments]
1. The mower according to the present invention may be configured such that an elliptical or substantially rectangular through hole is formed in the deck, and the bearing boss portion is attached to the cutting blade housing via a flange portion attached to the lower surface of the deck around the through hole. good.
2. The mower according to the present invention may be provided with a cutting blade and a wind-up blade on the drive shaft.
3. In the mower according to the present invention, the pulley may be supported above the through hole with a part of the pulley entering the through hole.
[Brief description of the drawings]
FIG. 1 is a plan view of a mower. FIG. 2 is a longitudinal sectional view of a main part. FIG. 3 is a longitudinal sectional view of a main part.
DESCRIPTION OF SYMBOLS 1 Deck 3 Cutting blade housing 4 Cutting blade 8 Belt transmission mechanism 9 Fan blade 10 Through-hole 11 Flange part 12 Bearing boss part 13 Pulley 14 Drive shaft 21 Transmission belt 23 Communication hole X Vertical axis core

Claims (1)

A plurality of bearings that support a drive shaft having a plurality of through holes formed in a deck of a cutting blade housing, a pulley at an upper portion, and a cutting blade and a wind vane at a lower portion around a longitudinal axis. Each boss part is attached to the cutting blade housing via a flange part attached to the lower surface of the deck around the through hole, and the pulley is supported above the through hole,
A belt-type transmission mechanism is provided that wraps a transmission belt on the upper surface side of the deck over each pulley, and rotates the drive shafts in an interlocked manner.
A mower configured to discharge the cut grass cut by the cutting blade to the outside of the cutting blade housing by the conveying wind generated by the wind blade,
A mower in which a communication hole that communicates the inside and outside of the cutting blade housing through the through hole is formed in the flange portion, and the through hole is formed in a shape larger than the outer shape of the pulley in the axial direction view.

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