JP2001251924A - Mower deck of blade mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose the constitution of a deck of a blade mower in a low and compact state and maintain the treating performance of cutting and discharging of lawn grass at a high level. SOLUTION: The constitution of this mower deck of the blade mower is characterized in that side blade shafts 2 and 3 are arranged on both the left and right lateral sides of a center blade shaft 1, a belt 6 for transmitting a power to each of the blade shafts 1, 2 and 3 is stretched along the upper lateral face in the mower deck 5 having a reaped lawn grass discharging outlet 4 formed in a part just at rear and a gear case 10 having a pulley shaft 7 and gears 8 and 9 for carrying out the reversible rotation, and transmission of the power to the side blade shaft 3 on either one of the sides is fitted and installed in a case hole 11 of the mower deck 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mower deck for a blade mower. A rear discharge mower that forms a discharge port on the rear side of the mower deck and discharges the cut grass to the rear side is used as a mid mower mounted on the abdomen of a passenger tractor, a front mower mounted on the front, etc. You can reap turfgrass.

[0002]

It is desired that a mower deck mounted on a tractor body and raised and lowered has a low height and is compact. For this reason, turf grass cutting performance,
And the discharge performance of mowed turfgrass must not be reduced and it is necessary to maintain them at high performance.

[0003]

According to a first aspect of the present invention, there is provided a mower deck in which side blade shafts are arranged on both left and right sides of a center blade shaft, and a cut grass discharge port is formed immediately behind the center blade shaft. Then, along the upper surface, each blade shaft 1, 2,
A gear case 10 having a pulley shaft 7 and gears 8 and 9 for transmitting a reverse rotation of the side blade shaft 3 on one of the sides is fitted into a case hole 11 of the mower deck 5. The mower deck of the blade mower is characterized by being provided together.

According to a second aspect of the present invention, side blade shafts 2 and 3 are disposed on both left and right sides of the center blade shaft 1,
A blade 12, 13, 1 of each blade shaft 1, 2, 3 is attached to a mower deck 5 having a cut grass discharge port 4 formed immediately behind the blade.
The blade mower deck is characterized in that the width of each outlet opening in the tangential direction with respect to the rotation of 4 is substantially equal.

According to a third aspect of the present invention, side blade shafts 2 and 3 are disposed on both left and right sides of the center blade shaft 1,
A guide plate 15 is provided on the mower deck 5 having the cut grass discharge port 4 formed immediately behind the blades 12, 13, 14 along the rotating outer peripheral surfaces of the blades 12, 13, 14. The mower deck of the blade mower is characterized in that it is formed at a higher level than the mower deck 17.

According to a fourth aspect of the present invention, side blade shafts 2 and 3 are disposed on both left and right sides of the center blade shaft 1,
The mower deck 5 formed with the cut grass discharge port 4 at the rear thereof is provided with a bottom plate 19 along the rear of the rotation area of the blades 12, 13, and 14 at an appropriate interval 18 at the discharge port 4 portion. The blade mower has a mower deck configuration.

[0007]

According to the first aspect of the present invention, the transmission by the belt 6 causes the center blade shaft 1 to move from the side blade shaft 2 to the side blade shaft 2.
3 is rotated. One of the side blade shafts 3
Is reversely rotated from the pulley shaft 7 via the gears 8 and 9. For this reason, the grass cut by the center blade shaft 1 and the side blade shaft 2 that are rotated forward and the grass that is cut by the side blade shaft 3 that is rotated in the reverse direction are rearward from the outlet 4 at the center rear portion of the mower deck 5. Collected and discharged. As described above, the gear case 10 for transmitting the reverse rotation of the one side blade shaft 3 is provided in the case hole 11 of the mower deck 5.
The side blade shaft 3 is positioned lower in the mower deck 5 and
The height of the power transmission surface of the belt 6 with respect to the upper surface of the belt 6 can be reduced, the effective height in the mower deck 5 can be maintained at a full level, the cutting performance can be prevented from lowering, and the height of the power transmission surface of the belt 6 can be prevented. Can be lowered.

According to a second aspect of the present invention, the mower deck 5
The lawn grass cut by the forward rotation of the center blade 12 and the side blades 13 and the reverse rotation of the side blades 14 is collected toward the outlet 4 on the central rear side and discharged backward. This outlet 4 is provided for each blade 12, 13,
Since the width of each of the outlets opened in the tangential direction with respect to the rotation of the rotary shaft 14 is formed to be substantially equal in width, the blades 12, 13,. 14 can be maintained substantially uniformly, and lawn clogging can be reduced.

According to a third aspect of the present invention, the mower deck 5
The turfgrass guided inside is cut off by the reverse rotation of the center blade 14 and is collected toward the outlet 4 on the central rear side and discharged backward. At this time, the grass cut by the rotation of the center blades 12 and the side blades 13 and 14 is guided by the guide plate 15 which is formed high at the front lower end edge 16 and low at the rear lower end edge 17. The turfgrass mowed by the blades 12, 13, and 14 can be easily discharged to the inside while being easily guided to the outlet 4 at the center rear.

According to the fourth aspect of the present invention, the grass cut by the forward rotation of the center blade 12 and the side blades 13 and the reverse rotation of the side blades 14 in the mower deck 5 is directed toward the discharge port 4 on the central rear side. Is collected and discharged backward. Turfgrass discharged rearward by the rotation of the blades 12, 13, and 14 is guided over the bottom plate 19 over the gap 18. Therefore, when the mowing height is increased or the mower deck 5 is temporarily raised, turfgrass can be received on the upper surface of the bottom plate 19. In addition, when the cut grass is clogged during cutting, the discharged grass is dropped from the 18 spaces, so that no more grass clogging can be accumulated. In addition, the turfgrass clogging can be eliminated from the space of 18 parts, so that the maintainability can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is used as a rear discharge type blade mower for a mid mower mounted on the abdomen of a riding tractor, a front mower mounted on a front portion, and the like. Since the blade mower of these forms is mounted on a small tractor, the structure of the mower deck is made as compact as possible and the mowing performance is maintained so as not to deteriorate. For this reason, the invention according to claim 1 firstly arranges the side blade shafts on the left and right sides of the center blade shaft, and provides the blade shaft along the upper surface on the mower deck in which the cut grass discharge port is formed immediately behind. And a gear case having a pulley shaft and a gear for reversely transmitting one of the side blade shafts is fitted into a case hole of the mower deck. By using a mower deck of a blade mower, the height of the belt can be reduced, the effective height in the mower deck can be kept full, and a decrease in mowing performance can be prevented.

Here, the upper surface of the mower deck may be formed in a horizontal plane over the entire surface, but the bearing portion of each blade shaft and the gear case mounting portion may be slightly recessed downward. Then, in the mounting portion of the gear case, a case hole in which the gear case can be fitted is formed in the mower deck. In order to balance the weight of the left and right mower decks, the transmission input from the tractor body side is made to the center blade shaft at the center of the mower deck, and transmitted from this center blade shaft to the side blade shaft by the belt. You. For this reason, the height of the mower deck is such that the upper end portion of the center blade shaft is formed at the highest position, so that the height or length of the center blade shaft, the side blade shaft, and the like can be reduced as much as possible. .

Next, according to a second aspect of the present invention, side blade shafts are arranged on both left and right sides of the center blade shaft.
A blade characterized in that the width of each outlet opening to be tangential to the rotation of each blade of each blade shaft is formed to be approximately equal in width on a mower deck having a cut grass discharge port formed immediately behind the blade. As a configuration of Moore's Mower deck,
The dischargeability of the cut grass by each blade can be maintained substantially evenly, so that grass clogging is reduced. Here, the discharge port of the mower deck is designed so that the grass cut by the rotation of each blade is discharged independently while collecting the grass cut by the rotation of each blade from the left and right to the central portion side, and the grass cut by the rotation of each blade is independently discharged. By forming the width of the discharge port wide so as to cause the discharge, smooth discharge with low discharge resistance is performed.

Next, according to a third aspect of the present invention, side blade shafts are arranged on both left and right sides of the center blade shaft.
A guide plate is provided along the rotating outer peripheral surface of each of these blades on the mower deck that has a cut grass discharge port immediately behind, and a front lower end edge of the guide plate is formed higher than a rear lower end edge. The blade mower has a mower deck configuration in which the front lower edge of the guide plate facilitates the guidance of the turfgrass into the mower deck, and the rear lower edge enhances the collecting property to the discharge port.

Here, the guide plate has a front lower end edge,
It is located on the rear side of the front edge of the mower deck and is formed at a higher position. Further, the front lower edge is formed at a position higher than the rotation surface of the blade, and the rear lower edge is formed at a position lower than the rotation surface of the blade.

Further, in the invention according to claim 4, side blade shafts are disposed on both left and right sides of the center blade shaft,
The mower deck of the blade mower is characterized in that a bottom plate is provided along the rear lower side at an appropriate distance from the rotation range of each blade at the discharge port portion on the mower deck having a cut grass discharge port formed immediately behind. In addition, it is possible to guide the turfgrass discharged from the discharge port so as not to fall, and when clogging occurs, the turfgrass can be removed downward from the gap.

Further, the mower deck surface above the discharge port portion is formed so as to be higher upward, so that the discharge port is formed wider so that turfgrass can be discharged smoothly. Further, a scooping rake that can rotate back and forth is provided at the discharge port, and the grass at the discharge port can be discharged to the outside by the scraping rake. Further, a pair of front and rear gauge wheels are disposed on the left and right sides of the mower deck, but the front and rear gauge wheels are displaced to the left and right so that the same position is not stepped on, so as not to damage the lawn mowing marks. Can be

The discharge port of such a mower deck is opened toward the lower side of the tractor and can be directly discharged to a mowing mark. Further, a shooter, a blower and the like are connected to be housed in a collector at the rear of the vehicle body. It can be.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Front wheel 21 of riding garden tractor body 20
The mower deck 5 is suspended from the abdomen between the front wheel 23 and the rear wheel 22 via a front link 23 and a rear link 24 so as to be movable up and down. You.

The vehicle body 20 has an engine mounted under a front hood 27, can steer the front wheels 21 by operating a steering handle 28, and has a cockpit 30 above a transmission case 29 at the rear. On the rear side of the vehicle body 20, there are provided a shooter 32 for sucking the turfgrass discharged rearward from the discharge 4 at the rear central portion of the mower deck 5 and transporting the cut turfgrass rearward, and a suction blower 33. There is provided a collector 31 for accommodating turfgrass blown out of the turf. Reference numeral 34 denotes an opening / closing lid for discharging the stored grass.

The mower deck 5 includes a lift arm 25
Is vertically raised and lowered in parallel via a pair of left and right front links 23 and rear links 24. The mower deck 5 has a ground contact wheel 35 at the center of the front end, and a gauge wheel 37,
38 are provided and are supported at a constant cutting height above the cutting ground.

A center blade shaft 1 and a side blade shaft 2 for normal rotation and a side blade shaft 3 for reverse rotation are arranged at a central portion of the lower portion of the mower deck 5 and rear portions on both left and right sides.
Blades 12, 1 are provided at the lower ends of the blade shafts 1, 2, 3, respectively.
Attach 3,14. An input gear case 39 is provided at the upper center of the mower deck 5, and an interlocking shaft 45 is provided between the input shaft 40 and the front PTO shaft 44 at the front of the vehicle body 20.
And the input shaft 40 is driven and rotated, whereby the blade shafts 1, 2, and 3 can be rotated in an interlocked manner.

The bearing portions of the forward center blade shaft 1, the side blade shaft 2 and the reverse side shaft 3 of the mower deck 5 have bearing recesses 46, 47, the upper surfaces of which are recessed to an appropriate depth. 48 are formed. Of these, the bearing recess 48 located on one side has a case hole 11 into which the gear case 10 is fitted.

Bearing metal parts 49 and 50 for bearing the normal rotation blade shafts 1 and 2 are fitted into the bearing concave and convex parts 46 and 47, and bolts 51 are fitted to the bottoms of the bearing concave parts 46 and 47.
Tighten and fix with. The bearing metals 49, 50 are made to project downward with respect to the bearing recesses 46, 47.

A gear case 10 for bearing the pulley shaft 7 and the reversing side blade shaft 3 is fitted into the case hole 11 of the bearing recess 48, and is fastened and fixed with a bolt 51. The lower case 53 of the gear case 10 having the metal boss portion 52 has a lower portion than the mounting surface projecting downward from the bottom surface of the bearing recess 48. Gears 8 and 9 for reverse rotation are provided in the lower case 53. The upper case 54 that covers the upper side of the lower case 53 has its upper surface located near the upper surface of the mower deck 5.

The pulley shaft 7 of the gear case 10 is located at the center of the mower deck 5, and the reversing side blade shaft 3
Is positioned on the outside and mounted on the shaft. The pulley shaft 7 is supported by a pair of upper and lower bearings 55, and the reversing side blade 3 is supported by a bearing 56.

At the lower end of each blade shaft 1, 2, 3,
The mounting metal 57 is screwed, the shaft holes of the blades 12, 13 and 14 are fitted, and the blades 12, 13 and 14 are rotatably mounted by tightening and fixing with nuts 58 or bolts. In the gear case 10, a gear 8 below the pulley shaft 7 and a gear 9 above the reversing blade shaft 3 are meshed.

Pulleys 59, 60, 61 are attached to the upper ends of the forward rotation blades 1, 2 and the pulley shaft 7, and the belt 6 is stretched. 62 is a tension pulley and input gear case 39
It is located behind. These pulleys 59, 60, 6
1, and a belt cover 63 that covers the upper side of the belt 6 is detachably attached to the upper surface of the mower deck 5 with bolts.

The discharge port 4 of the mower deck 5 is provided at the central portion on the rear side, and the turf grass to be cut by the blades 12, 13, 14 is discharged from the discharge port 4 to the rear side. Outlet 4
Are the blades 12, 13, 14 on the left and right sides from the center.
Is formed so as to extend over the rear portion of the rotation locus portion, and a notch portion 64 is formed in which a central portion of a rear end of a ceiling or a rear wall of the motor deck 5 is cut out.

A delta-shaped discharge guide plate 65 is formed at the center of the discharge port 4 and on the side of the side blade shaft 2 behind the center blade shaft 1, and the discharge port 4 is controlled by the discharge guide plate 65. Are separated into widths C and D to prevent mutual discharge resistance and interference. The discharge guide plate 65 is located between the blades 12 and 13 of the normal rotation blade shafts 1 and 2, and the guide plate 67 on the side of the center blade shaft 1 is formed along the rotation direction of the blade 12. The turfgrass is guided so as not to scatter to the discharge port 4 on the narrow width C side.

The guide plate 6 on the side of the forward rotation side blade shaft 2
Numeral 6 is formed to face the discharge direction, and guides the discharge of the turfgrass through the discharge port 4 having the narrow width C. Also, the guide plate 68 on the wide side D on the side of the reversing side blade shaft 3 is formed on the face,
Cutting grass is discharged from the discharge port on the wide width D side by rotation of both the blades 12, 14 of the center blade shaft 1 and the reversing side blade shaft 3.

The ratio of the widths C and D divided by the discharge guide 65 of the discharge port 4 is approximately C = 1, D = 2.
The percentage is set. On the inner peripheral wall of the mower deck 5, a cylindrical guide plate 15 is provided in a trilobal shape along the rotation outer periphery of the blades 12, 13, and 14.

When the input shaft 40 is rotated via the interlocking shaft 45 by driving the PTO shaft 44, the center blade shaft 1 at the center is rotated forward A through the bevel gear. The belt 6 and the pulley 6 are driven by the pulley 59 of the center blade shaft 1.
0, the side blade shaft 2 on one side is rotated in the same forward direction A, and the side blade shaft 3 is reversely rotated B via the pulley 61, the pulley shaft 7, and the gears 8 and 9.

Each blade 1 thus rotated
The turfgrass cut by the blades 2, 13, 14 is cut by the blade 13 of the side blade shaft 2 at the lateral end, and the turfgrass of a narrow width C formed mainly on the side blade shaft 2 side of the discharge guide plate 65. It is discharged backward from discharge 4.

The grass cut by the blade 12 of the center blade shaft 1 at the center is discharged rearward from the wide-width discharge port 4 formed on the side blade shaft 3 side of the discharge guide plate 65. Also, the blade 1 of the side blade shaft 3
The turfgrass cut at 4 is the rotation direction B of the blade 14.
, And is discharged from the discharge port 43 on the same side as the turfgrass discharged by the blade 12 rotation A of the center blade shaft 1 at the central portion.

The guide plate 15 provided inside the mower deck 5 is formed along the rotation locus of each of the blades 12, 13, and 14, and the discharge port 4 side is opened. The lower edge of the guide plate 15 is formed at the same level or higher than the lower edge 69 of the mower deck 5. Each of these blades 1
The front lower edge 16 located on the front side of the decks 2, 13 and 14 is formed at a position higher than the deck lower edge 69 at an interval E behind the deck lower edge 69, and is formed at a position higher than the blades 12, 13 and 14 lower edge. It has been easier to guide the grass.

The rear lower end edge 17 of each of the blades 12, 13, 14 is formed substantially at the same level as the deck lower edge 69 of the mower deck 5, and the cut grass is discharged to the discharge port 4 without leaving any grass. To be guided. This rear lower edge 17 is
The discharge guide plate 65 formed at the intermediate portion of the discharge port 5 is similarly formed.

Further, these blades 12, 13 and 14
Notched edges 70 and 71 having appropriate heights are formed in the guide plate formed between the blade chambers located at the positions. By forming these notched edges 70 and 71, the lower end of the guide plate 15 swings right and left by the approach of the left and right blades 12 and 13 or the blades 13 and 14, so that the blades contact the rotating edge. Can be prevented.

The guide plates 7 on both the left and right sides of the discharge port 4
The second portion is opposed to the notch portion 64 and has an upper edge formed to be higher, and a ceiling portion 73 at the rear central portion of the mower deck 5 is formed.
And a scraping rake 74 is provided below the ceiling portion 73. A bottom plate 19 is provided below the outlet 4. The leading edge of the bottom plate 19 and each blade 12, 1
An interval 18 is formed between the rotation trajectory edges 3 and 14 and is opened downward. The scraping rake 74 is
The turfgrass clogged at the upper portion of the bottom plate 19 can be discharged downward by the rear gap 18 by being pivoted downward with the handle 76 about the rake shaft 75 provided above the portion.

[Brief description of the drawings]

FIG. 1 is a rear view of a mower deck.

FIG. 2 is a plan view thereof.

FIG. 3 is a side view thereof.

FIG. 4 is an enlarged rear view of a part thereof.

FIG. 5 is an overall side view.

FIG. 6 is an overall plan view.

FIG. 7 is a bottom view of the mower deck.

FIG. 8 is a side sectional view of a part thereof.

FIG. 9 is a side sectional view of a part thereof.

FIG. 10 is a side sectional view of a part thereof.

FIG. 11 is a side sectional view of a part thereof.

FIG. 12 is a bottom view of the mower deck discharge port.

FIG. 13 is a plan view of the mower deck.

FIG. 14 is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center blade shaft 2 Side blade shaft 3 Side blade shaft 4 Discharge port 5 Mower deck 6 Belt 7 Pulley shaft 8 Gear 9 Gear 10 Gear case 11 Case hole 12 Blade 13 Blade 14 Blade 15 Guide plate 16 Front lower edge 17 Rear lower edge 18 Spacing 19 Bottom plate

Claims (4)

[Claims] 1. A mower deck 5 having side blade shafts 2 and 3 disposed on both left and right sides of a center blade shaft 1 and a cut grass discharge port 4 formed immediately behind the center blade shaft 1. , 3 and a gear case 10 having a pulley shaft 7 and gears 8, 9 for reversely transmitting the side blade shaft 3 on either side, and a gear hole 10 in the case hole 11 of the mower deck 5. Mower deck of blade mower characterized by being fitted. 2. A mower deck 5 having side blade shafts 2 and 3 disposed on both left and right sides of a center blade shaft 1 and a cut grass discharge port 4 formed immediately behind the center blade shaft 1.
A blade mower deck characterized in that the width of each outlet opening formed in the tangential direction with respect to the rotation of each of the blades 12, 13, 14 is substantially equal. 3. A mower deck 5 having side blade shafts 2 and 3 disposed on both left and right sides of a center blade shaft 1 and a cut grass discharge port 4 formed immediately behind the center blade shaft 1, respectively.
A mower deck for a blade mower, characterized in that a guide plate 15 is provided along the rotation outer peripheral surfaces of the blades 3 and 14, and a front lower end edge 16 of the guide plate 15 is formed higher than a rear lower end edge 17. 4. A mower deck 5 having side blade shafts 2 and 3 disposed on both left and right sides of a center blade shaft 1 and a grass turf discharge port 4 formed immediately behind the blades 12 and 13 at the discharge port 4 portion. , A bottom plate 19 which is provided along the lower rear side of the space 18 as appropriate from the rotation range of the blade mower.