JP3951498B2 - Rear discharge mower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grass discharge passage for a rear discharge mower. This invention is mounted vertically movably to the vehicle body front and the belly bottom of the mobile agricultural machine in accordance with the forward drive rotates the plurality of rotating cutting blade, grass and weeds to vegetation clippings or fuselage width on a traveling ground surface The present invention relates to a rear discharge mower that discharges grass to the rear of the mower deck.
[0002]
[Background Art and Problems to be Solved by the Invention]
As a rear discharge mower to be attached to a conventional mobile agricultural machine, one disclosed in JP-A-10-286016 is known. In this known one, the deck ceiling surface is provided with an uneven portion having a large size, and the protrusion is used as a cut grass flow passage or a discharge duct, which causes the deck to have a complicated structure and increase the production cost. There is a problem that the projecting part comes into contact with the airframe when it is lifted.
[0003]
[Means for Solving the Problems]
The present invention is intended to solve such problems of the conventional apparatus, and has taken the following technical means. That is, the mower deck (1) is a left-side rotary cutting blade (4) which is rotatably supported by a lower part of a vertical drive shaft which is a flat ceiling surface and is arranged substantially side by side from the ceiling surface. A central rotary cutting blade (5) and a right-side rotary cutting blade (6) are provided, and an outer peripheral upper plate (2) substantially along the rotational trajectory of each rotary cutting blade (4, 5, 6 ) and a lower end portion Each rotating cutting blade (4, 5, 6) extends from the rotation locus to a position covering the outside with a predetermined gap, and the upper end is surrounded by an upright wall (3) that is integrally attached to the upper plate (2). In the plan view, the left rotating cutter blade (4) and the central rotating cutter blade (5) are rotated to the right and the right rotating cutter blade (6) is rotated to the left so that the upright wall (3) behind the rotation-opposing portion in plan view. A rear discharge mower with a weed outlet (7)
Between the front portion of the left side rotary cutting blade (4) with a central rotating cutting blade (5), and hanging the husband Re husband is longitudinal guide plates (9, 10) from the ceiling surface side of the mower deck (1) both Construct a cut grass side conveyance path (11) between the upper front part of the cutting blade ,
In front of the rotation facing portion of the central rotary blade (5) that rotates to the right in a plan view and the right-side rotary blade (6) that rotates to the left, the rotary cutter blades (5, 5 from the ceiling surface side of the deck (1)) . 6) The V-shaped V-shaped guide plate (12) is suspended at a position substantially along the rotation trajectory of 6) , and the protruding tip portion of the V-shaped guide plate (12) is set as the substantially center position in the left-right direction of the passage. (1) in the rear discharge mower left and right guide plate exit side to form a Haikusa passage (13) which is swung to the left towards the rear of the (14, 15) depending from the ceiling surface side of the mower deck (1),
A weed opening (7) is opened in the standing wall (3) portion at the rear end of the weed passage (13), and the upper plate (2) in the vicinity of the discharge port (7) A U-shaped and rear part is formed as a convex part (126) protruding slightly upward,
A transmission case (42) is provided above the center of the upper plate (2), and a driving force is input to the input shaft (43) of the transmission case (42). The central drive shaft (101) of the rotary cutting blade (5) is interlocked, and the left drive shaft (102) of the left rotary cutter (4) is belt-driven from the central drive shaft (101). 108) The belt is transmitted to the shaft (110) inside the case (108) and the right-side rotary cutting blade (6) supports the spur gear (107) by meshing the drive spur gear (109) and the spur gear (107) in the case (108). ) To drive the right side drive shaft (103) in the reverse direction, and the upper plate (2) to which the reversing gear case (108) is attached is formed in a lower protrusion (126a) that is recessed along the shape of the case (108). Characterized by the formation It has a configuration of ya discharge mower.
[0004]
DETAILED DESCRIPTION OF THE INVENTION
The figure shows an embodiment of the present invention, in which a rear discharge mower 8 that cuts grass and grass from the ground surface is attached to a lower part of an abdomen of a moving vehicle 17 such as a tractor. It may be attached to the front. In the rear discharge mower 8, which is a working machine, the present invention is obtained by folding the present invention into a cut grass carry-out passage portion of the mower deck 1, which will be described in detail below.
[0005]
As shown in the figure, the moving vehicle 17 is a four-wheel tractor for riding, and main frames 18 and 18 made of a channel material in the front-rear direction are arranged in the lower part of the machine body in a pair of left and right directions. The main frame 18 is welded at an intermediate portion in the front-rear direction, and the left and right intervals are widened so that the rear main frame 18 a approaches the rear wheel 19. The main frames 18, 18 are narrower on the front side, and the engine 21 is mounted on the front upper part. A front axle 22 is attached to the front lower portion of the main frame 18 so as to be able to swing left and right by a center pivot system. Front wheels 20 and 20 are attached to end portions of the front axle 22 via a king pin 23 so as to be steerable. Yes. A steering handle 24 steers the front wheels 20 and 20. Further, between the left and right rear main frames 18a, 18a, a rear axle 25 in which a rear axle 24 is housed with a bearing interposed, and a traveling transmission case 26 are attached to constitute a strength member. The rear wheels 19, 19 are attached to wheel bosses 27, 27 respectively provided at both ends of the rear axles 24, 24.
[0006]
The front ends of the left and right main frames 18 and 18 are connected to each other by side stays, and the rear ends of the rear main frames 18a and 18a are each provided with a square cross section 28, which is vertically upright by welding, bolting, or the like. It is arranged. The upper portions of the left and right struts 28 are connected to the upper surface of the rear main frame 18a by the left and right reinforcing frames 29 and 30 having different lengths in the front-rear direction to improve the strength and maintainability.
[0007]
The outer periphery of the engine 21 is covered with a bonnet 31, a side cover 32, and the like, and the steering handle 78 described above protrudes upward from the rear part of the bonnet 31. And the state which approached the main frame 18 or the rear main frame 18a from the side of this side cover 32 to the space part between the front edge parts of the fender 34 with the seat 33 provided in the upper part between the left and right rear wheels 19, 19. A step 35 for covering the upper surface and placing the driver's foot is attached.
[0008]
Next, the power transmission system will be briefly described. The engine 21 has a crankshaft that is rearwardly lowered in the front-rear direction, and has a driving pulley 36 on the front projecting shaft and a first PTO shaft 37 for airframe traveling on the rear. Further, the axial direction of the center pivot shaft 38 supporting the left and right intermediate portions of the front axle 22 is made substantially parallel to the crankshaft, a driven pulley 39 is attached to the front end portion of the center pivot shaft 38, and the rear end of the center pivot shaft 38 is As the second PTO shaft 40 for driving the work machine, it protrudes rearward. A rotary power transmission tool 41 such as a V-belt or a chain is wound between the drive pulley 36 and the driven pulley 39, and the rotation of the second PTO shaft 40 is turned on and off via a clutch (not shown).
[0009]
Although details of the rear discharge mower 8 will be described later, an input shaft 43 of a transmission case 42 projecting upward from the center of the upper plate 2 in the left-right direction of the mower deck 1 and a work machine drive first projecting from the rear end of the center pivot shaft 38. Power is transmitted between the two PTO shafts 40 via a universal joint 44. Rear discharge mower 8, the rear end portion before and after pivotally attached to the front end portion to the right and left not a One body link 45 and 46, are rotatably attached Re each Re each front and rear portion of the mower deck 1, after the left link 46 The rear discharge mower 8 is moved up and down by a lift arm 47 and a lift link 48 for moving up and down. 49 is an actuator for raising and lowering, and the illustrated example has a hydraulic cylinder structure. When a hydraulic cylinder having one end attached to the main frame 18 is extended, one end of the lift arm 47 is moved about the shaft 50 as a fulcrum. The end raises the lift link 48. Before and after the rear discharge mower 8, gauge wheels 51, 51. . A pair of left and right are attached so as to freely swing, and as the height of the deck 1 is adjusted, the height of the uncut grass on the ground surface is adjusted.
[0010]
The first PTO shaft 37 protruding rearward of the crankshaft is for driving the rear wheels 19, 19, and will be described in detail below. A traveling transmission case 26 is mounted on the right side of the rear axle 24 at an inward approach position of the rear main frame 18a. Above the front part of the traveling transmission case 26 is a so-called H.D. S. An HST case 55 having a T device is attached. Reference numeral 56 denotes a travel input shaft that projects forward from the upper portion of the HST case 55, and a travel universal joint 57 is attached to the first PTO shaft 37 that projects rearward from the engine 21 to drive force. Is communicating. The pump 53 is driven by the travel input shaft 56, and the motor 54 is shifted to the required number of rotations by adjusting the swash plate, and the rotation of the motor 54 is transmitted to various gears in the travel transmission case 26. The vehicle shifts by driving the rear wheels 19 and 19 by changing the auxiliary shift such as forward / reverse and high / low speed.
[0011]
In the illustrated example, the left and right rear wheels 19, 19 are covered with left and right fenders 34, 34 from the top to the front, and the left and right fenders 34, 34 are connected by wall surfaces, and the seat 33 is placed on the floor cover 58. Provided. The fender 34 connected to the left and right by the floor cover 58 is held in a position-regulated manner at a raised position and a lowered position by a pair of left and right upper and lower links 59 and 60 and a damper 61 that are pin-pin supported in parallel links. The fender 34 is held at the lowered position during normal work and traveling, and the fender 34 and the floor cover 58 are held at a position where the fender 34 and the floor cover 58 are largely lifted up during internal inspection around the traveling transmission case 26 and around the shooter 16 described later.
[0012]
Support brackets 62, 62 are integrally attached by welding or the like in front of the upper ends of the left and right columns 28, 28, and the rear ends of the upper links 59 are respectively attached to the mounting holes opened at two positions above and below the support bracket 62. The upper part is attached to the upper attachment hole, and the rear end part of the lower link 60 is attached to the lower attachment hole. In addition, a blower case 64 in which a blower 63 is inserted is integrally attached behind the left and right support columns 28 via a fastening tool such as a bolt or a nut. Further, an intake cylinder 66 having an intake port 65 that detours to the lower side of the rear axle 24 and opens frontward from the front wall portion of the blower case 64 toward the lower front is integrally protruded obliquely downward. The intake port 65 is a rectangular opening having a wide front view, and the rear end of the rectangular shooter 16 having a wide cross section projecting rearward from the standing wall 3 at the rear of the mower deck 1 of the rear discharge mower 8 in the intake port 65. Department has entered. Since the shooter 16 also moves up and down as the mower deck 1 moves up and down, the front part of the shooter 16 is mounted on the rear end part of the mower deck 1 through a horizontal axis hinge 67 so as to be swingable up and down. Is supported at the peripheral edge of the intake port 65 described above.
[0013]
A conveying cylinder 68 protrudes upward above the blower case 64, and a leading end portion of the conveying cylinder 68 protrudes into an upper portion of a collector 69 serving as a storage container and opens inward. A cover case 70 that covers a transmission for driving the blower 63 is attached to the rear wall surface 64 a of the blower case 64. A first pulley 71 and a second pulley 72 are housed inside the cover case 70. The first pulley 71 is attached to the rear portion of the first shaft 73 protruding forward from the right rear wall surface 64a. The first shaft 73 is transmitted via a drive universal joint 75 to and from a drive shaft 74 that protrudes rearward and upward from the traveling transmission case 26. A blower 63 is attached to the front part of the attachment shaft of the second pulley 72, and the blower 63 is rotated via a rotational power transmission tool 76 such as a V-belt or a chain. Due to the rotation of the blower 63, the inside of the intake cylinder 66 becomes negative pressure, the inside of the shooter 16 communicating between the rear part of the mower deck 1 and the intake port 65 also becomes negative pressure, the turf grass cut in the mower deck 1 is sucked by the blower 63, and the transfer cylinder 68 To the collector 69. The sucked turfgrass is sent to the collector 69, and when it is almost full, the lid 77 in the latter half is opened and discharged to a predetermined place.
[0014]
Next, the main part of the rear discharge mower 8 will be described. Between the wheel bases of the front and rear wheels 20 and 19, there are four front and rear links 45, 46. . The rear discharge mower 8 suspended through the central drive shaft 101 of the central rotary cutting blade 5 provided at the forefront of the traveling direction with the axial center direction as the vertical direction with respect to the substantially flat plate-like upper plate 2 of the moor deck 1. And a left-side drive shaft 102 for the left-side rotary cutting blade 4 and a right-side drive shaft 103 for the right-side rotary cutting blade 6 with the left and right ends of an approximately isosceles triangle having the apex as a rear position. Two drive shafts are juxtaposed.
[0015]
Each of the above-mentioned rotary cutting blades is attached to the lower end of each of the drive shafts with a bolt or the like, and is a mowing device having a horizontally long cutting width, and a standing wall that hangs down below each rotary cutting blade 3 prevents the scattered pebbles and solids scattered when the rotary blade is rotating. As shown in the overall plan view of FIG. 2, the cutting width in one step of the rear discharge mower 8 protrudes outward from the maximum width of the moving vehicle 17, and the left and right side rotary cutting blades 4, 6 rotate. The trajectory protrudes outward from the front and rear wheels 20, 19. In addition, the distance between the left-side rotary cutter 4, the central rotary cutter 5 and the right-side rotary cutter 6 adjacent to each other has a minimum gap t that does not come into contact with each other at the time of rotation. However, since the central rotary cutting blade 5 is positioned in front of the aircraft traveling direction “F” in the forward direction, the cutting blades overlap each other by the dimension S with respect to the turf cutting of the ground. There is no remnant.
[0016]
In the embodiment shown in the plan view of the main part in FIG. 1, the two shafts of the left driving shaft 102 and the central driving shaft 101 are rotated clockwise in a plan view, and only the right driving shaft 103 is rotated counterclockwise. Further, as shown in the overall plan view of FIG. 2 and the overall side view of FIG. 3, the transmission case 42 is disposed above the center of the substantially flat upper plate 2 of the moor deck 1 as described above. . Power is transmitted to the input shaft 43 of the transmission case 42 through the universal joint 44 by the driving force of the second PTO shaft 40 for driving the work machine protruding from the rear end of the center pivot shaft 38. A pair of bevel gears 104 is provided between the rear portion of the input shaft 43 and the upper portion of the central drive shaft 101, and the driving force of the second PTO shaft 40 is transmitted to the central drive shaft 101.
[0017]
When the rear discharge mower 8 is operated from the lowered state shown in FIG. 3 to the lifted state shown in FIG. 5, the transmission case 42 is positioned between the left and right main frames 18, 18. In addition, there is a space between the safety cover 114 and the protrusion 126, which will be described in detail below, and between the left and right main frames 18 and 18, so that the suspension does not interfere and does not interfere.
[0018]
As shown in FIGS. 2, 3, and 4, a central pulley 105 is attached to the central drive shaft 101 between the transmission case 42 and the upper plate 2 via an engagement tool such as a key or a spline. A left pulley 106 is attached to the upper part of the left driving shaft 102 protruding upward from the substantially flat upper plate 2 via an engaging tool. Similarly, a spur gear 107 is attached to the upper part of the right drive shaft 103 protruding upward from the substantially flat plate-like upper plate 2.
[0019]
The spur gear 107 meshes with a drive spur gear 109 of the same number of teeth that is housed in a reversing gear case 108 and rotates to the right. A shaft 110 projects upward from the drive spur gear 109, and a right pulley 111 is attached to the projecting end of the shaft 110. Reference numeral 112 denotes a tension pulley that adjusts the tension direction and tension of the V-belt 113 driven between the right-rotation central pulley 105, the left-hand pulley 106, and the right-hand pulley 111. ing. The upper and side portions of these V belts 113 and rotating pulleys such as the central pulley 105, the left pulley 106, and the right pulley 111 are covered with a safety cover 114.
[0020]
As shown in FIG. 2, since the tension pulley 112 is disposed at a position pushed inward larger than the tangential direction of the central pulley 105 and the right pulley 111, the central pulley 105 and the right pulley can be easily configured. The contact area of the V-belt 113 with respect to 111 increases and the transmission power can be increased. Further, the spur gears 107 and 109 are used at the lower part of the right pulley 111 so that the rotation direction of the clockwise V-belt 113 can be reliably transmitted to the right drive shaft 103 in the counterclockwise direction. Thus, a simple configuration that does not require the V pulley is possible, and the cost can be reduced.
[0021]
Each of the rotary cutting blades 4, 5, and 6 is a propeller-like flat plate, and a central portion in the longitudinal direction is attached to each of the drive shafts 102, 101, and 103, and turf grass is cut at the rotating front edge of the protruding flat plate. In this configuration, two cutting blades are provided in one rotation having a blade 115 that scatters and discharges turfgrass at the rear edge of the rotation. As described above, three rotary cutting blades are provided side by side in the left-right direction with the central drive shaft 101 as the head in the traveling direction. Further, as described above, the drive shafts 102, 101, and 103 are interlocked and connected by a rotary power transmission tool such as a V-belt so as to be driven at the same angular velocity. 6 are assembled so that each has a phase difference of 90 degrees. However, the cutting edge positions of the rotary cutting blades 4, 5, and 6 become different positions due to slip at the V-belt 113 portion or slip at a rotary cutting blade impact relief mechanism (not shown) with use.
[0022]
In the illustrated example, the right rotating blade has two axes and the left rotating blade has one axis, and the rotation opposing portion is deviated to the right side of the mower deck 1. Then, a grass cutting port 7 is provided in the standing wall 3 at the rear of the facing portion. Next, the mowing grass guide provided inside the mower deck 1 will be described mainly with reference to FIGS. Since the upper plate 2 has a substantially flat plate shape, when there is no guide plate on the inner surface, the upper plate 2 is cut by the cutting blade 115 provided on the tip side of each rotary cutting blade 4, 5, 6 and lifted upward by the blade plate 116. Turfgrass accumulates close to the lower surface of the upper plate 2 and falls over the ground surface by its own weight when a predetermined amount is exceeded, so turfgrass lumps irregularly around after running and is difficult to collect and clean.
[0023]
Therefore, in the illustrated example, an outer peripheral guide wall for guiding the cut turfgrass is provided in the vicinity of each of these rotary cutting blades 4, 5, and 6. The ceiling side is located at a position with a margin slightly forward from the front tangent of the rotation locus of the left rotation cutter 4 at the lower end of the left drive shaft 102 and the rotation locus of the center rotation cutter 5 at the lower end of the center drive shaft 101. The front guide plate 9 having its upper end fixed to the front is suspended substantially forward of the rotary cutting blade, and the rear guide plate 10 is suspended in the vertical direction at a substantially equal interval to the front guide plate 9 in the same manner. On the upper side of the upper plate 2 of the mower deck 1 on the lower surface portion of the mower deck 1, a cut grass side conveyance path 11 is configured above the front plates of the left side rotary cutter blade 4 and the central rotary cutter blade 5 by the guide plates 9 and 10.
[0024]
Reference numeral 120 denotes a left side vertical wall, which is a vertical wall that covers the outer periphery of the left side rotary cutting blade 4 with a gap, and has a front end connected to the passage start end on the left side of the front guide plate 9 and a rear end. The part extends to the intersection 122 that intersects the central rear standing wall 121 that is a part of the standing wall that covers the outer periphery of the central rotary cutting blade 5 with a gap. As described above, the rear guide plate 10 cannot be made longer than a predetermined length because each of the rotary cutting blades passes below. In the illustrated example, the bottom surface is closed by the bottom plate 123 substantially parallel to the upper plate 2, and the intersection portion After 122, the inclined surface 123a is directed toward the upper plate 2 for a while.
[0025]
A V-shaped guide plate 12 hangs down in a plan view at a position having a small gap at the front portion of the rotation locus of the central rotary blade 5 and the right-side rotary cutter blade 6 and the V-shaped guide plate. The left and right guide plates 14 and 15 for the weeding passage 13 with the protruding front end portion 124 of the twelve projecting portion 124 approximately at the center position in the left-right direction of the passage and swung to the left on the exit side toward the rear of the moor deck 1 are arranged on the ceiling surface side of the deck 1. It hangs down from a certain upper plate 2. Similarly, since the central rotary cutting blade 5 passes through the front portion of the left guide plate 14, the left guide plate 14 has a guide surface that closes the upper space as a left short guide standing wall 14 a that protrudes upward from an end edge of the bottom plate 123. The front portion of the guide plate 15 is the right short guide standing wall 14a having the same height as the bottom plate 123 because the right-side rotary cutting blade 6 passes. The cutting blade upper space on the right side of the right short guide standing wall 14a is formed by extending the bottom plate 123b in the lateral direction and closing the cutting blade upper space.
[0026]
The right side vertical wall 125 hangs down to the lower part of the cutting blade with a gap on the outer periphery of the rotation locus of the right side rotating cutting blade 6, its front end is connected to the V-shaped guide plate 12 side, and the rear end is right The guide plate 15 is connected. A weed opening 7 is opened in the standing wall 3 at the rear of the mower deck 1 located at the rear end of the weed path 13. Reference numeral 127 denotes an outlet bottom plate, which is a surface extending inwardly from the lower edge of the weed outlet 7 so as to improve the grass discharge performance. Further, the upper plate 2 portion in the vicinity of the weed outlet 7 constitutes a protrusion 126 that protrudes slightly upward at the rear part in a rear-viewed lower opening “U” shape. Trying to make it easier. The front edge of the protrusion 126 is obstructed when protruding from the lower front of the V-belt 113, and thus protrudes upward from the rear portion that does not contact the V-belt 113. Further, the upper plate 2 below the reversing gear case 108 described above is formed as a lower protrusion 126a that is shallowly recessed along the shape. Since the other upper plate 2 is not provided with unevenness, the mower deck 1 is configured to be easily manufactured. Also, if the internal guide plate is removed, the material can be easily shared with other mulching mower decks, thereby reducing costs.
[0027]
The flow of mowing turfgrass in the rear discharge mower 8 will be described. The turfgrass first mowing with the central rotary blade 5 as the aircraft moves forward is immediately sent to the weeding passage 13 along the V-shaped guide plate 12. In addition, the turf grass cut by the left-side rotary cutting blade 4 with a delay is sent to the grass removal path 13 along the V-shaped guide plate 12 together with the turf grass cut by the central rotary blade 5 through the cut grass side conveyance path 11. It is done. Further, the turf grass cut by the right-side rotary cutting blade 6 is sent to the weed path 13 along the V-shaped guide plate 12.
[0028]
At this time, the turf grass that is about to go around the rotary cutting blade after cutting is suspended floating grass in the upper half of the mower deck 1 by the guide plate 10 that hangs downward from the upper plate 2 and the left and right short guide standing walls 14a and 15a. As a result, the mower deck 1 with low horsepower consumption and good exhaustability can be provided.
[0029]
[Effects of the invention]
The present invention has the following specific effects by the above-described configuration. That is, the turfgrass first cut by the central rotary blade 5 as the machine moves forward is immediately sent to the weed path 13 along the V-shaped guide plate 12. In addition, the turf grass cut by the left-side rotary cutting blade 4 with a delay is sent to the grass removal path 13 along the V-shaped guide plate 12 together with the turf grass cut by the central rotary blade 5 through the cut grass side conveyance path 11. It is done. Further, the turf grass cut by the right-side rotary cutting blade 6 is sent to the weed path 13 along the V-shaped guide plate 12.
[0030]
As described above, the turfgrass which is going to go around the rotary cutting blade is restricted from going around other than the passage by the guide plate 10 and the left and right short guide standing walls 14a and 15a after hanging down from the upper plate 2. Therefore, it is possible to provide the mower deck 1 with low consumption horsepower and good exhaustability. Further, the upper plate 2 part of the mower deck 1 is formed in the vicinity of the grass outlet 7 and the upper plate 2 part of the lower part of the reversing gear case 108 is configured as a protrusion 126 that protrudes slightly upward at the rear part in a lower-side opening “U” shape. Since the upper plate 2 is formed in a substantially flat shape except that the upper plate 2 is shallowly recessed along the shape, the mower deck 1 is configured to be easily manufactured. Also, if the internal guide plate is removed, it is easy to share the material with other types of mower decks, which reduces costs.
Further, by using the spur gears 107 and 109 under the right pulley 111, the rotation direction of the clockwise V-belt 113 can be reliably transmitted to the right drive shaft 103 in the counterclockwise direction. Thus, a simple configuration that does not require the V pulley is possible, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a mower around a rotary cutting blade with a part cut away.
FIG. 2 is an overall plan sectional view showing a state where a mower is attached to a moving vehicle.
FIG. 3 is an overall side view showing a mower descending state in which a mower and a storage container are attached to a moving vehicle.
FIG. 4 is a cross-sectional view of the moor deck in FIG. 1 taken along the line AA.
FIG. 5 is an overall side view showing a state where the mower and the seat are raised.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Moore deck 2 Upper plate 3 Standing wall 4 Left side rotation cutting blade 5 Center rotation cutting blade 6 Right side rotation cutting blade 7 Weeding mouth 8 Rear discharge mower 9 Front guide plate 10 Rear guide plate 11 Mowing side conveyance path 12 V type guide Plate 13 Weeding passage 14 Left guide plate 15 Right guide plate
42 Transmission case
43 Input shaft
101 Central drive shaft
102 Left side drive shaft
103 Right side drive shaft
107 Spur gear
108 Reverse gear case
109 Spur gear
126 Convex
126a Downward projection

Claims (1)

The mower deck (1) is a flat plate-like ceiling surface, and a left-side rotary cutting blade (4) and a central rotation that are rotatably supported by the lower part of a vertically-oriented drive shaft that is substantially side by side from the ceiling surface. A cutting blade (5) and a right-side rotating cutting blade (6) are provided, and an upper plate (2) having an outer peripheral shape substantially along the rotation trajectory of each rotating cutting blade (4, 5, 6), and a lower end portion thereof. A configuration in which each rotary cutting blade (4, 5, 6) extends from the rotation trajectory to a position covering the outer side with a predetermined gap and is surrounded by an upright wall (3) integrally attached to the upper plate (2) . In the plan view, the left-side rotary cutting blade (4) and the central rotary cutting blade (5) are rotated to the right and the right-side rotary cutting blade (6) is rotated to the left to be discharged to the standing wall (3) behind the rotation-opposing portion. a rear discharge mower that grass outlet (7) is provided, between the front portion of the left side rotary cutting blade (4) with a central rotating cutting blade (5), said mower deck (1) Central rotating cutting blade which constitutes the grass side conveying path (11) between the hanging down each Re each are longitudinal guide plates (9, 10) forward top of both the cutting blade from the ceiling side, rotates clockwise in a plan view (5) and the front side between the rotation facing portions of the right-side rotating cutting blade (6) that rotates counterclockwise (6) , a position substantially along the rotation locus of the rotating cutting blades (5, 6) from the ceiling surface side of the deck (1). The V-shaped V-shaped guide plate (12) hangs down to the left and the exit side toward the rear of the deck (1) is set to the left with the projecting tip of the V-shaped guide plate (12) as a substantially central position in the horizontal direction of the passage. in the rear discharge mower that lateral guide plates (14, 15) depending from the ceiling surface side of the mower deck (1) forming a Haikusa passage (13) which is swung towards the rear end of the Haikusa passage (13) The weed opening (7) is opened in the standing wall (3) portion of the portion, and the upper plate (2) portion in the vicinity of the discharge port (7) A lower opening “U” -shaped and the rear part is configured as a convex part (126) protruding slightly upward, and a transmission case (42) is provided above the center of the upper plate (2), and the transmission case (42) The driving force is input to the input shaft (43), and the central driving shaft (101) of the central rotary cutting blade (5) is interlocked in the transmission case (42), and left from the central driving shaft (101). The left drive shaft (102) of the rotary cutter (4) is transmitted to the belt, while the belt is transmitted to the shaft (110) in the reverse gear case (108) and the drive spur gear (109) in the case (108). The upper plate on which the right-side drive shaft (103) of the right-side rotary cutting blade (6) supporting the spur gear (107) is reversely transmitted by meshing with the spur gear (107), and the reversing gear case (108) is attached. (2) the case (108) A rear discharge mower characterized in that it is formed in a lower protrusion (126a) that is recessed along the shape .

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