JP2004000265A - Cut-grass discharge device of mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cut-grass discharge device of a mower for simply removing grass in the case where a grass-discharge passage of a mower deck is clogged with cut grass. <P>SOLUTION: Three rotary cutting-blades are provided in the lateral direction. A left-side rotary cutting blade 4 and a central rotary cutting blade 5 are rotated clockwise in a plan view, and a right-side rotary cutting blade 6 is rotated counterclockwise in the plan view. The upper part and the outside periphery of these three blades are covered with an upper plate 2 and a wall 3 of a mower deck 1. A cut-grass discharge passage 13 is provided at the part from the part where the blade 5 and the blade 6 are oppositely rotated to the rear. An openable bottom plate 127 is provided below the passage 13. A lever 82 is provided for opening/closing the bottom plate 127 on either side of the left and right sides on the deck 1. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a rear discharge type mower cutting and grass discharging device.

A mower is attached to the lower part of the abdomen of a mobile agricultural machine so that it can move up and down freely, and while rotating forward, multiple rotating blades are rotated to cut grass and weeds planted on the ground and weed from the weed mouth at the rear of the mower deck. It has been known.

(4) The rear discharge mower is one that discharges the cut grass from the rear discharge port of the mower deck, and the rear discharge type is generally the one described in Patent Literature 1.

The mower described in Patent Document 1 includes three mowing blades, a mower deck that covers them, and a mowing grass discharge unit protruding rearward from an intermediate portion in the width direction of the mower deck. Is constituted by a cylindrical body, and is provided so as to protrude more rearward than the rear wall of the mower deck toward the upper rear side of the body of the mobile vehicle.

As in this conventional example, if the rear end of the cut grass discharge portion protrudes greatly obliquely rearward, there is a risk that the mower deck may hit the main frame constituting the body of the moving vehicle when lifting the mower deck, and the lifting amount of the mower deck is limited. At the same time, there is a disadvantage that the grass is clogged on the way depending on the discharge angle of the cut grass discharge portion.
JP-A-10-286016

The problem to be solved is that it is not easy to clean grass or grass cut by the cutting blade rotating in the mower deck in the cut grass discharge section.

An object of the present invention is to provide a device capable of easily removing cut grass, and has taken the following technical means.
That is, three rotary cutting blades are arranged side by side in the left and right direction, the left rotary cutting blade 4 and the central rotary cutting blade 5 are rotated clockwise in plan view, and the right rotary cutting blade 6 is rotated left in plan view. The upper and outer walls of the three rotating blades are covered with the upper plate 2 and the upright wall 3 of the mower deck 1, and the central rotating blade 5 and the right-side rotating blade 6 are rotated backwards from the part where they rotate. A weed passage 13 is provided, and an openable bottom plate 127 is provided below the weed passage 13, and a lever 82 for opening and closing the bottom plate 127 is provided on one of the left and right sides on the mower deck 1. And

Since the present invention is constructed as described above, when grass is clogged in the weed passage of the mower deck, the operator grips the lever 82 provided on one of the left and right sides of the mower deck and opens and closes the bottom plate 127 for easy operation. Can be easily removed for inspection and cleaning.

The figure shows an embodiment of the present invention, in which a rear discharge mower 8 for cutting lawn and grass from the ground surface is attached to a lower part of a moving vehicle 17 such as a tractor so as to be able to move up and down. It may be attached to the front. The present invention is one in which the present invention is folded into the cut grass discharge passage portion of the mower deck 1 in the rear discharge mower 8 as a working machine, and will be described in detail below.

The moving vehicle 17 is a riding four-wheeled tractor as shown in the figure, and has a main frame 18 made of a channel material in the lower part of the fuselage and arranged in a front-rear direction in a left-right pair. The main frame 18 is welded at an intermediate portion in the front-rear direction, and the rear main frame 18 a is widened in the left-right direction so as to approach the rear wheel 19. The intervals between the main frames 18, 18 are narrow on the front side, and the engine 21 is mounted on the upper front. 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 method, and front wheels 20, 20 are attached to an end of the front axle 22 via king pins 23 so as to be steerable. I have. Reference numeral 78 denotes a steering handle, which steers the front wheels 20, 20. Further, a rear axle 25 having a rear axle 24 therein and a traveling transmission case 26 are mounted between the left and right rear main frames 18a, 18a with bearings interposed therebetween to form a strength member. Then, rear wheels 19, 19 are mounted on wheel bosses 27, 27 respectively provided at both ends of the rear axles 24, 24.

The left and right main frames 18, 18 are connected left and right by side stays by side stays, and the rear main frames 18a, 18a are provided at their rear ends with upright columns 28 each having a rectangular cross section by welding, bolting, or the like. It is arranged in. The upper portions of the left and right pillars 28 are alternately connected to the upper surface of the rear main frame 18a by left and right reinforcing frames 29, 30 having different lengths in the front-rear direction, thereby improving strength and improving maintainability.

(4) The outer periphery of the engine 21 is covered with a bonnet 31 and a side cover 32 and the like, and the steering handle 78 described above projects upward from the rear of the bonnet 31. Then, from the side of the side cover 32, a space between the front edges of the fenders 34 with the seats 33 provided above the left and right rear wheels 19, 19 is approached to the main frame 18 or the rear main frame 18 a. A step 35 for covering the upper surface and putting the driver's foot on the vehicle is attached.

Next, the power transmission system will be briefly described. The engine 21 has a crankshaft extending backward and forward, and has a drive pulley 36 protruding forward from the shaft and a first PTO shaft 37 protruding rearward from the vehicle. The center axis of a center pivot shaft 38 that supports 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 of the center pivot shaft 38, and the rear end of the center pivot shaft 38 is The second PTO shaft 40 for driving the working machine projects rearward. A rotary power transmission tool 41 such as a V-belt or a chain is wound between the driving pulley 36 and the driven pulley 39, and turns on and off the rotation of the second PTO shaft 40 via a clutch (not shown).

Although details of the rear discharge mower 8 will be described later, an input shaft 43 of a transmission case 42 protruding above the center of the upper plate 2 in the left-right direction of the mower deck 1, and a working machine driving protruding rear end of the center pivot shaft 38. Power transmission is performed between the two PTO shafts 40 via a universal joint 44. The rear discharge mower 8 has front and rear links 45 and 46 having front end portions pivotally mounted on the body of a pair of left and right sides, and front and rear portions of the mower deck 1 are pivotally mounted on rear ends thereof, respectively. The rear discharge mower 8 is moved up and down by a lift arm 47 and a lift link 48 that are operated to move up and down. Reference numeral 49 denotes an elevating actuator, which is a hydraulic cylinder in the illustrated example. When the 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, and the lift arm 47 and the like are moved. The end lifts the lift link 48. Before and after the rear discharge mower 8, gauge wheels 51, 51. . A pair of right and left is mounted to swing freely, and the height of the uncut grass on the ground surface is adjusted in accordance with the height of the deck 1.

The first PTO shaft 37 projecting 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 inwardly approaching position of the rear main frame 18a. Above the front portion of the traveling transmission case 26, a so-called H.264 hydraulic drive transmission device, which is a pump 53 and a motor 54, is provided. S. An HST case 55 containing a T device is attached. A traveling input shaft 56 projects forward from the upper portion of the HST case 55, and has a traveling universal joint 57 mounted between the first input shaft 37 and the first PTO shaft 37 projecting rearward from the engine 21. Is transmitted. The pump 53 is driven by the traveling input shaft 56, the speed of the motor 54 is changed to a required rotational speed by adjusting the swash plate, and the rotation of the motor 54 is transmitted to various gears in the traveling transmission case 26, The vehicle travels by driving the rear wheels 19, 19 by changing the sub-shift such as forward / reverse or high / low speed.

In the illustrated example, the left and right rear wheels 19, 19 are covered with left and right fenders 34, 34 from above, and the left and right fenders 34, 34 are connected to each other by a wall surface to form a floor cover 58, and the seat 33 is placed on the floor cover 58. Provided. The fender 34 connected left and right by the floor cover 58 is held in 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 which are supported by a pin as parallel links. The fender 34 is held at the lowered position during normal work or running, and the fender 34 and the floor cover 58 are held at a greatly raised position during internal inspection around the traveling transmission case 26 and around a shooter 16 to be described later.

Support brackets 62, 62 are integrally attached by welding or the like to the front ends of the upper ends of the left and right columns 28, 28, respectively. The part is mounted on the upper mounting hole, and the rear end of the lower link 60 is mounted on the lower mounting hole so as to be vertically swingable. A blower case 64 in which a blower 63 is inserted is integrally attached to the rear between the left and right columns 28, 28 via fasteners such as bolts and nuts. In addition, an intake cylinder 66 having an intake port 65 that opens forward and bypasses the rear axle 24 downward from the front wall of the blower case 64 toward the lower front is integrally projecting obliquely downward. The intake port 65 is a rectangular opening having a wide width when viewed from the front. The rear end of the rectangular shooter 16 having a wide cross section protruding 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. The department is involved. Since the shooter 16 moves up and down as the mower deck 1 moves up and down, the front portion of the shooter 16 is attached to the rear end of the mower deck 1 via a hinge 67 having a horizontal axis so as to be vertically swingable. Are supported by the peripheral portion of the intake port 65 described above.

A transport cylinder 68 protrudes upward above the blower case 64, and a distal end portion of the transport cylinder 68 protrudes into an upper part of a collector 69 as a storage container and opens inward. A cover case 70 that covers a transmission for driving the blower 63 is attached to a rear wall surface 64 a of the blower case 64. A first pulley 71 and a second pulley 72 are provided inside the cover case 70. The first pulley 71 is attached to a rear portion of the first shaft 73 that projects forward from the right rear wall surface 64a. The first shaft 73 transmits through a drive universal joint 75 between the first shaft 73 and a drive shaft 74 projecting rearward and upward from the traveling transmission case 26. A blower 63 is attached to the front of the attachment shaft of the second pulley 72, and rotates the blower 63 via a rotary power transmission tool 76 such as a V-belt or a chain. Due to the rotation of the blower 63, a negative pressure is generated in the intake cylinder 66, and a negative pressure is also generated in the shooter 16 communicating between the rear part of the mower deck 1 and the intake port 65. From to the collector 69. The sucked turfgrass is sent to the collector 69, and when it is almost full, the rear cover 77 is opened and discharged to a predetermined place.

Next, the rear discharge mower 8, which is a main part, will be described. Below the main frame 18 between the wheel bases of the front and rear wheels 20, 19, 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 in the traveling direction with the axial direction being the vertical direction with respect to the substantially flat upper plate 2 of the mower deck 1 A left driving shaft 102 for the left rotating blade 4 and a right driving shaft 103 for the right rotating blade 6, with the left and right ends of the approximately isosceles triangle having the apex as rear positions. The drive shafts are arranged side by side.

At the lower end of each drive shaft, each of the above-mentioned rotary cutting blades is attached with a bolt, etc., respectively, as a mowing device of a horizontal cutting width, and a standing wall hanging down below each rotary cutting blade. 3 prevents the flying blades from scattering flying pebbles and solids generated when the rotating blades rotate. The cutting width in one step of the rear discharge mower 8 protrudes outward from the maximum width of the moving vehicle 17 as shown in the overall plan view, and the rotation trajectories of the left and right side rotary cutting blades 4 and 6 Each protrudes outward beyond the front and rear wheels 20,19. In addition, the spacing between the left rotating blade 4, the center rotating blade 5, and the right rotating blade 6, which are adjacent to each other, has a minimum gap t that does not come into contact with each other during rotation, and reduces the distance between the shafts. However, since the central rotary cutting blade 5 is located ahead of the aircraft traveling direction "F" in the forward direction, the cutting blades overlap each other by the dimension S when cutting the ground grass. No uncut leaves occur.

In the embodiment shown in the main part plan view of FIG. 1, two shafts of the left drive shaft 102 and the central drive shaft 101 are rotated clockwise in plan view, and only the right drive shaft 103 is rotated counterclockwise. 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 upper plate 2 of the mower deck 1 as described above. . The driving force of the second PTO shaft 40 for driving the working machine, which projects from the rear end of the center pivot shaft 38, is transmitted to the input shaft 43 of the transmission case 42 via a universal joint 44. 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.

中央 A central pulley 105 is attached to the central drive shaft 101 between the transmission case 42 and the upper plate 2 via an engaging tool such as a key or a spline. Further, a left pulley 106 is attached to the upper portion of the left drive shaft 102 which projects upward from the substantially flat upper plate 2 via an engagement tool. Similarly, a spur gear 107 is attached to the upper part of the right drive shaft 103 projecting upward from the substantially flat upper plate 2.

平 The spur gear 107 is meshed with a drive spur gear 109 having the same number of teeth, which is housed in a reversing gear case 108 and rotates clockwise. The drive spur gear 109 has a shaft 110 projecting upward, and a right pulley 111 is attached to a projecting end of the shaft 110. Reference numeral 112 denotes a tension pulley, which adjusts the tension direction and tension of the V-belt 113 run around between the central pulley 105, which is a V pulley having the same diameter, the left pulley 106, and the right pulley 111. The upper and side portions of the V-belt 113 and the rotating pulleys such as the center pulley 105, the left pulley 106, and the right pulley 111 are covered with a safety cover 114.

As shown in FIG. 2, the tension pulley 112 is disposed at a position where it is pushed inward more than the tangential direction of the center pulley 105 and the right pulley 111. The contact area of the V-belt 113 with respect to 111 increases, and the transmission power can be increased. Further, the rotation direction of the clockwise V-belt 113 can be reliably transmitted to the right drive shaft 103 as the counterclockwise direction by using the spur gears 107 and 109 below the right pulley 111. , A simple structure that does not require the V pulley, and cost reduction can be achieved.

Each of the rotary blades 4, 5, and 6 is a propeller-shaped flat plate, and has a longitudinal central portion attached to each of the drive shafts 102, 101, and 103. And a blade 115 for scattering and discharging 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. As described above, the drive shafts 102, 101, and 103 are linked to each other 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, due to the use, the slip at the V-belt 113 portion, the slip at the rotary cutting blade impact relief mechanism (not shown), and the like cause the cutting edge positions of the rotary cutting blades 4, 5, and 6 to be different.

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 deflected to the right side of the mower deck 1. A grass weeding port 7 is provided on the upright wall 3 behind the facing portion. Next, the mowing guide unit provided inside the mower deck 1 will be described. Since the upper plate 2 has a substantially flat plate shape, when there is no guide plate on the inner surface, the cutting blade 115 provided on the tip side of each of the rotary cutting blades 4, 5, and 6 is cut, and the cutting blade 116 is lifted upward by the blade plate 116. The turfgrass accumulates close to the upper plate 2, and if it exceeds a predetermined amount, it falls on the ground surface by its own weight, so that lumps of turfgrass are scattered irregularly after traveling and it is difficult to collect and clean.

Therefore, in the illustrated example, an outer circumferential guide wall for guiding the cut turf grass is provided in the vicinity of each of the rotary cutting blades 4, 5, and 6. 1 and 4, the rotational trajectory of the left rotating blade 4 at the lower end of the left driving shaft 102 and the forward tangent of the rotational trajectory of the central rotating blade 5 at the lower end of the central drive shaft 101 are slightly different from each other. A front guide plate 9 whose upper end is fixed to the ceiling side is hung down at a position with a margin to the front, and a rear guide plate 10 is hung down at a substantially equal interval from the front guide plate 9, before and after the hung. A cutting grass lateral conveyance path 11 is formed by the guide plates 9 and 10 below the upper plate 2 of the mower deck 1 above and between the left rotating blade 4 and the front portion of the center rotating blade 5.

Reference numeral 120 denotes a left-side standing wall, which is a standing wall that covers the outer periphery of the left-side rotating blade 4, the front end of which is connected to the front guide plate 9 described above, and the rear end of which is outside the central rotating blade 5. It extends to an intersection part which intersects with the central rear standing wall 121 which is a part of the standing wall covering the periphery. Since the rotating blades pass below the guide plate 10 as described above, the guide plate 10 cannot be made longer than a predetermined length. In the illustrated example, the lower surface is closed with a bottom plate 123 substantially parallel to the upper plate 2. The inclined surface 123a is directed toward the side.

A V-shaped guide plate 12 having a V-shape in plan view is hung at a position having a small gap at the front of the rotation locus of the center rotary blade 5 and the right-side rotary blade 6. The left and right guide plates 14 and 15 for the weeding passage 13 whose exit side toward the rear of the deck 1 is swung to the left with the projecting tip 124 of the twelve as the substantially center position in the left and right direction of the passage are arranged on the ceiling surface side of the deck 1. It hangs from a certain upper plate 2. The front portions of the left and right guide plates 14 and 15 are short right and left guide upright walls 14a and 15a having a shorter hanging bottom surface for the rotary blade to pass through.

On the outer periphery of the rotation trajectory of the right-hand rotary cutting blade 6, a right-side standing wall 125 hangs down below the cutting blade. ing. A weeding opening 7 is opened in the standing wall 3 behind the mower deck 1 located at the rear end of the weeding passage 13.

The weeding mouth 7 has a rectangular shape that is horizontally long in rear view, and is attached to the periphery of the shedding so as to cover the entrance side of the shooter 16 as shown in FIG. In addition, the upper plate 2 near the weed opening 7 is formed as a protrusion 126 projecting slightly upward from the upper surface when viewed from the rear, to make it easier to discharge grass. The front edge of the protrusion 126 becomes obstructive if it projects from the lower front of the V-belt 113. Therefore, the front edge of the protrusion 126 is inclined upward from the rear of the safety cover 114 to cover the central pulley 105, the left and right pulleys 106 and 111, the V-belt 113, and the like. Has been established.

{Circle around (7)} In FIGS. 7 and 8, reference numeral 127 denotes an outlet bottom plate which is attached below the weed opening 7 which is open to the vertical wall 3 behind the mower deck 1 and which is the outlet bottom plate 127 of the first embodiment. The outlet bottom plate 127 of the first embodiment is attached so that the outlet bottom plate 127 can swing back and forth about a shaft 79 on the right side. Numeral 80 is a lower plate of the weeding mouth, which is a lower side plate of the weeding opening 7 having a rectangular shape which is horizontally long in the rear view and a left and right upper surface near the outlet of the outlet bottom plate 127 which swings back and forth below the same. It is also used as a guide surface for holding down. Further, the swinging tip of the outlet bottom plate 127 is received by a lower plate 81 on the lower surface of the left guide plate 14 of the weed passage 13, and the grip portion 83 of the lever 82 extending the shaft 79 is moved forward against the spring 84. When moving, the sliding movement of the outlet bottom plate 127 is stabilized.

前 The front edge of the outlet bottom plate 127 is extended to the extent that it substantially coincides with the rotation trajectories of the central rotary blade 5 and the right rotary blade 6. Further, the rear edge portion moves back and forth at a lower outer portion of the shooter 16. When the rear edge of the outlet bottom plate 127 is moved backward to the position indicated by the imaginary line in FIG. 7, the cut grass or grass cut behind the weed passage 13 shown in FIG. 8 is automatically dropped and discharged downward. Side grooves 85, 85 are opened on both left and right sides of the weed opening 7, so that the shooter 16 can be easily attached and the posture can be changed at the time of elevating.

The upper plate 2 of the mower deck 1 has a lower portion of the above-described reversing gear case 108 shallowly recessed along the shape other than the protrusion 126 along the shape. Since the other upper plate 2 is not provided with irregularities, the mower deck 1 is configured to be easily manufactured. In addition, if the internal guide plate is removed, the material can be easily shared with other mulching mower decks, which reduces costs.

The flow of the cut grass in the rear discharge mower 8 will be described. The grass cut first by the central rotary blade 5 with the advance of the fuselage is immediately sent to the weed passage 13 along the V-shaped guide plate 12. Also, the grass cut by the left rotating blade 4 with a delay is sent to the grass passage 13 along the V-shaped guide plate 12 together with the grass cut by the central rotating blade 5 through the grass side transport path 11. Can be The grass cut by the right-hand rotary cutting blade 6 is similarly sent to the weed passage 13 along the V-shaped guide plate 12. Since the exit bottom plate 127 is provided at the rear end of the weed passage 13 so as to be swingable, the mowing deck is fed into the shooter 16 along the upper surface of the horizontal exit bottom plate 127 during work. There is no lot of grass cut down. When the cut grass is jammed at the rear portion of the weed passage 13 and does not flow into the shooter 16, the gripped portion 83 of the lever 82 is moved forward by a foot or a hand against the spring 84 so that the jammed grass is moved downward. Can be discharged.

FIG. 9 shows an outlet bottom plate 127a of the second embodiment. A turnbuckle 87 is provided between the rear protruding arm 46b of the link 46a that is pivotally attached to the main frame 18 and the rear end arm 88 of the outlet bottom plate 127a. By vertically connecting the mower deck 11 with the elevating device, the movement of the rear link 46a is used to lower the tip of the outlet bottom plate 127a around the horizontal shaft 79a to the position shown by the solid line during lifting. Thus, the cut grass clogged in the vicinity of the weed opening 7 can be discarded.

FIG. 3 is a plan view of a part of the mower around the rotary mowing blade. FIG. 2 is an overall plan sectional view showing a state in which a mower is attached to a moving vehicle. FIG. 4 is an overall side view showing a state in which the mower and the storage container are attached to the moving vehicle and the mower is lowered. It is AA sectional drawing of the mower deck in FIG. It is a principal part figure of the whole side surface which shows the state which raised the mower and the seat part. It is sectional front view behind a chute part. FIG. 2 is a plan view of a mower deck standing wall, around a weed opening, partially cut away. It is a side view around the mower deck standing wall and the weeding mouth where a part was cut. It is a side view of another Example at the time of mower deck lifting.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 mower deck 2 upper plate 3 upright wall 4 left rotating blade 5 center rotating blade 6 right rotating blade 7 weed opening 8 rear discharge mower 13 weed passage 114 safety cover 126 protrusion 127 exit bottom plate

Claims (1)

Three rotating cutting blades are arranged side by side in the left and right direction, and the left rotating cutting blade 4 and the center rotating cutting blade 5 are rotated clockwise in plan view, and the right rotating cutting blade 6 is rotated left in plan view. The upper and outer circumferences of the three rotating blades are covered with an upper plate 2 and an upright wall 3 of the mower deck 1, and the central rotating blade 5 and the right-side rotating blade 6 rotate rearward from a portion where they rotate. The mowing deck 13 is provided with an openable bottom plate 127 below the weeding passage 13, and a lever 82 for opening and closing the bottom plate 127 is provided on one of the left and right sides of the mower deck 1. Mower mowing equipment.

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