JP6255557B2 - Mowing machine - Google Patents

Description

  The present invention relates to a cutting work machine for cutting an object to be cut such as grass by a pair of rotating cutting rotary bodies.

  An object to be harvested is taken from a machine body supported by a traveling unit driven to travel, a pair of left and right harvesting rotary bodies rotatably supported on the front side of the aircraft, and a scraping space formed between the left and right transport rotary bodies. 2. Description of the Related Art A harvesting machine including a driving device that rotationally drives the left and right harvesting rotators on the side to be scraped rearward is known (for example, see Patent Document 1).

JP 2008-167679 A

  In the harvesting machine in the above document, a pair of left and right harvesting rotators (in the same document, “blade 14”) performs the harvesting work while scraping the harvesting object such as grass backward, but the height of the harvesting object is If it is high, the object to be cut comes into contact with the aircraft and falls in an unintended direction. This prevents the object to be cut from being smoothly pushed back and cut smoothly by the cutting blade, resulting in reduced cutting efficiency. There is a case.

  The present invention is a cutting machine that cuts an object to be cut such as grass by a pair of rotating rotary bodies that rotate, and efficiently cuts and cuts the cutting object smoothly regardless of the height. It is an object of the present invention to provide a mowing machine capable of harvesting.

In order to solve the above-mentioned problem, first, the machine body 3 supported by the traveling unit 2 that is driven to drive, a pair of left and right cutting rotary bodies 28 that are rotatably supported on the front side of the machine body 3, and left and right cutting rotations. A pair of left and right transport rotators 29 that are rotatably supported directly above the body 28, and the left and right sides of the left and right transport rotators 29 from the scraping space S formed between the left and right transport rotators 29 And a driving device that rotationally drives the cutting rotator 28 and the conveying rotator 29. The cutting rotator 28 has a plurality of cutting blades 88 that project radially from the rotation center Y and rotate integrally. The cutting blades 88 are arranged side by side in the rotational direction at intervals, and the left and right cutting rotators 28 are arranged so that the left and right cutting ranges of the cutting blades 88 of the left and right cutting rotators 28 partially overlap. and the driving device, a power source 7 , And a transmission device 16 for transmitting the power of the animal power source 7 to the rotating body 28 and the conveyance rotating member 29 each reaper, the drive apparatus, when cutting the work, so that the upper portion of the cutting object is laid down forward on, and the reaper rotating body 28, a conveying rotary member 29 disposed just above the該刈preparative rotating body 28, by the transmission device 16 is configured to rotationally drive at a speed higher than the running speed of the running portion 2 It is characterized by that.

  Secondly, the left and right cutting rotators 28 are arranged such that the rotation trajectories D1 of the cutting blades 88 partially overlap each other in plan view, or the left and right cutting rotators 28 are arranged as cutting blades. The arrangement is such that, in a state in which the rotation trajectory D1 of 88 is not overlapped in plan view, the cutting ranges in the left-right direction by the cutting blade 88 are partially overlapped with each other.

  Thirdly, the cutting blade 88 is formed into a symmetrical shape in the rotational direction, the blade portions 92A and 92B are formed on both edges in the rotational direction of the cutting blade 88, and the cutting rotary body having the cutting blade 88 is formed. 28 is detachably supported on the body 3 side.

  Fourthly, a blade portion 92A that is inclined toward the retreating side in the rotation direction is formed at the edge portion on the retreating direction forward side in the tip end portion 88a of the cutting blade 88.

  Fifth, a pair of left and right or one crawler type in which the traveling unit 2 traverses and climbs over an object to be cut which is disposed behind the scraping space S and is scraped rearward by the left and right transport rotating bodies 29. It is a traveling device.

  Sixth, at least one of the right and left harvesting rotary bodies 28 is supported on the machine body 3 side so as to be able to swing left and right, and the harvesting rotary body 28 is elastically biased toward the side inclined downward toward the left and right outer sides. The elastic member 42 is provided.

  Seventh, the cutting rotator 28 and the transport rotator 29 are supported on the machine body 3 side so as to be integrally rotatable, and the reaping rotator 28 and the transport rotator 29 are provided integrally or close to each other. Yes.

  A cutting object such as grass is cut without being left uncut, in a state where it is positioned between adjacent cutting blades in a pair of left and right cutting rotary bodies that rotate at high speed and the left and right cutting ranges partially overlap. The pair of left and right transport rotating bodies that rotate at a higher speed than the traveling speed causes the harvested object to be scraped back and forth in order, thereby preventing the harvested object from being affected by the height. Can be cut smoothly and efficiently.

  The cutting blade is formed into a symmetrical shape in the rotational direction, the blade portions are formed at both edges in the rotational direction of the cutting blade, and the cutting rotary body having the cutting blade is detachably supported on the machine body side. According to the above, even when the cutting blade is worn, if one of the left and right cutting rotary bodies is replaced with the other and the other, it can be used as it is without replacing the cutting blade. Convenience is high.

  According to what the edge part of the front-end | tip part of the said cutting blade formed in the edge part of the rotation direction advance side incline to the rotation direction back side, it becomes possible to cut more smoothly.

  According to the traveling unit being a pair of left and right or one crawler type traveling device that traverses and climbs over a cutting object that is disposed behind the scraping space and is scraped backward by the left and right transport rotating bodies. For example, the harvested object is stepped on the crawler type traveling device, and this prevents the harvested object from remaining on the front side of the aircraft, so the harvested object remaining on the front side of the aircraft is This prevents the working efficiency from being lowered. In addition, since the object to be cut that has been scraped rearward is leveled, more efficient cutting work can be performed.

  At least one of the left and right cutting rotators is supported on the machine body so as to be tiltable in the left-right direction, and the cutting rotator is provided with an elastic member that elastically biases the cutting rotator toward the side inclined downward toward the left and right outer sides. According to this, the cutting operation can be efficiently performed by the cutting rotary body that is elastically pressed against the inclined surface.

  The cutting rotator and the conveying rotator are supported on the machine body side so as to be integrally rotatable, and the reaping rotator and the conveying rotator are provided integrally or in close proximity to each other to perform cutting more efficiently. Is possible.

It is a perspective view of the mower to which the mowing machine of the present invention is applied. It is a front view of the mower to which the mowing machine of the present invention is applied. It is a top view of the mower to which the mowing machine of the present invention is applied. It is a side view of the mower to which the mowing machine of the present invention is applied. It is an expanded sectional view showing the transmission composition of a transmission. It is an expanded sectional view showing the transmission composition of a mission case. (A) is sectional drawing which shows the structure of the rocking | pulling side cutting transmission cylinder of the state reduced to the minimum, (B) is sectional drawing which shows the structure of the rocking | pulling side cutting transmission cylinder of the state expanded to some extent. It is sectional drawing which shows the internal structure of a reaping device. It is a top view which shows the rotation locus | trajectory of the cutting rotary body in a cutting device, and a conveyance rotary body. It is a principal part top view which shows the structure of a cutting blade. It is a principal part front view which shows the cutting work state in the inclined surface of this mower. (A), (B) is a top view which shows the rotation locus | trajectory of the cutting rotary body and conveyance rotary body in the other example of a pair of left and right cutting devices, respectively.

  1 to 4 are a perspective view, a front view, a plan view, and a side view of a mower to which a mowing machine of the present invention is applied. The mower 1 shown in the figure includes a traveling unit 2 composed of wheels or a crawler traveling device (a pair of left and right crawler traveling devices in the illustrated example), an airframe 3 supported by the crawler traveling device 2, A cutting device 4 provided on the front side and the lower side of the machine body 3 for cutting an object to be cut such as grass, and a steering handle 6 having a U-shape in plan view and extending rearward from the machine body 3 are provided. .

  The airframe 3 includes a longitudinal cylinder 8 projecting forward from an engine 7 which is a kind of power source, a transmission case 9 disposed immediately below the longitudinal cylinder 8, and both left and right sides from the front end of the longitudinal cylinder 8. A horizontal cylinder 11 protruding in the left and right direction, a traveling transmission cylinder 12 extending straight and obliquely downward from the middle of the horizontal cylinder 11 and connected to the transmission case 9, and downward from both left and right sides of the horizontal cylinder 11 A pair of left and right cutting transmission cylinders 13 and 13, and a vertical connecting frame 14 for connecting and fixing the rear end side of the vertical cylinder 8 and the transmission case 9.

  The vertical cylinder 8 and the horizontal cylinder 11 communicate with each other inside, the horizontal cylinder 11 and the cutting transmission cylinders 13 and 13 communicate with each other inside, and the horizontal cylinder 11 and the traveling transmission cylinder 12 communicate with each other internally. The transmission cylinder 12 and the transmission case 9 communicate with each other, and a transmission device 16 (see FIG. 5) that transmits to the cutting device 4 and the crawler type traveling device 2 is provided in these members. The transmission device 16 and the engine 7 constitute a drive device. The drive device drives the crawler type travel device 2 and the reaping device 4 for reaping.

  In other words, these members function as transmission cases 8, 9, 11, 12, 13 for transmitting power inside, and the horizontal cylinder 11 and the pair of left and right cutting transmission cylinders 13 are gates in front view. The inlet 17 (refer FIG. 1) which makes a shape is formed.

  The crawler type traveling device 2 is disposed on the left and right side portions of the mission case 9 in a state of being positioned just behind the left and right reaping devices 4 (more specifically, behind a scraping space S described later). Then, the power from the transmission case 9 is transmitted, and the crawler type traveling devices 2 on both the left and right sides are driven (traveled and driven) in the same direction (specifically, forward direction) at the same speed. The

  Explaining the specific configuration, each crawler type traveling device 2 is rotatable in the longitudinal direction and the longitudinal frame 18 that can be adjusted in the longitudinal direction, and the longitudinal frame 18 is rotatable at both front and rear ends. The idler wheel 21 supported on the vertical frame 18, the drive sprocket 22 disposed immediately above the vertical frame 18, and the front and rear idler wheels 21, 21 and the crawler 23 having an annular shape when viewed from the side. .

  A single left and right drive shaft 24 protruding from the left and right sides of the transmission case 9 is inserted into the central portion of the left and right drive sprockets 22 so as to rotate integrally, and the drive shaft 24 rotating around its own axis. The drive sprocket 22 rotates together with the drive shaft 24 by power. The machine body 3 described above is supported by a crawler type traveling device (more specifically, a traveling frame 19) by a pair of left and right bearings 25 so as to be able to swing up and down about the axis of the drive shaft 24 as a fulcrum.

  By swinging up and down with the drive shaft 24 as a fulcrum with respect to the crawler type traveling device 2 of this machine body 3, it becomes possible to incline the reaping device 4 up and down along the traveling surface, and can cope with various working environments. become. Incidentally, the cutting operation is performed in such a state that it can swing up and down.

  The steering handle 6 has a U-shape with the front opened in a plan view and protrudes obliquely upward from the body 3 side in a side view, and a pair of left and right ends on the open side are It is attached to and supported by the body 3 so that the tilt angle can be adjusted. The operator holds the left and right sides of the steering handle 6 and performs the steering operation of the machine body 3.

  The reaping device 4 is provided at the lower ends of the left and right reaping transmission cylinders 13, 13. Each of the left and right reaping devices 4 has a vertical axis (rotation center) Y (FIGS. 5 and 7). , See FIG. 8), a cutting rotator 28 and a conveying rotator 29 that are rotatably supported, a cover body 31, and a contact body 32 protruding downward in a dome shape.

  A transport rotator 29 that rotates integrally with the harvesting rotator 28 is disposed immediately above the cutting rotator 28, and covers the upper surface side and the outer side of the transport rotator 29 directly above the transport rotator 29. A cover body 31 that is L-shaped and fixed to the cutting transmission cylinder 13 side is disposed, and the contact body 32 is integrally installed immediately below the cutting rotation body 28 so as to rotate integrally. In the illustrated example, the cutting rotator 28 and the conveying rotator 29 are integrally formed and both rotate integrally. However, they may be provided separately and close to each other. You may make it rotate with.

  The reaping device 4 on the left and right side (left side) is configured such that the rotational axis Y of the rotator 28 and the transport rotator 29 is tilted left and right with respect to the reaper shaft 13 that supports the reamer. 13A is a swinging reaping device 4A supported on the 13 side so as to be capable of tilting left and right, and the reaping device 4 on the other side is arranged such that the rotational axis Y is fixed to the reaping transmission tube 13. 13 is a horizontal reaping device 4B attached to and supported by 13;

  The support structure of the swinging / cutting device 4A will be described. The cutting / cutting transmission cylinder 13 on the swinging / cutting device 4A side (swinging / cutting transmission cylinder 13A) has an outer cylinder 33a and the same shaft that is fitted and inserted into the outer cylinder 33a. And an inner cylinder 33b. The mowing transmission cylinder 13A expands and contracts in the vertical direction by the vertical slide of the inner cylinder 33b inserted and supported so as to be vertically slidable with respect to the outer cylinder 33a fixed to the horizontal cylinder 11.

  Further, a cylindrical support case 34 extending in the front-rear direction is attached and fixed to the lower end portion of the cutting transmission cylinder 13 </ b> A, and the front end portion of the support case 34 is movable in a direction perpendicular to the support case 34. The base end portion of the case 36 is mounted and supported so as to be turnable in the left-right direction. On the distal end side of the movable case 36, the above-described cutting rotary body 28, the cutting transport body 29, the cover body 31 and the contact body 32 are attached. As the movable case 36 is rotated to the left and right with respect to the support case 34, the swinging and cutting device 4A is tilted to the left and right with respect to the cutting transmission cylinder 13A. That is, the swinging / reaping device 4A is tilted to the left and right with the axial center of the cylindrical support case 34 as a fulcrum.

  An operating arm 37 that protrudes upward from the upper surface side (specifically, the upper surface of the movable case 36) of the swinging and cutting device 4A and has a midway portion bent inwardly on the left and right sides is provided. The lower end portion of the operating arm 37 is fixed to the swinging mowing device 4A side (specifically, the movable case 36), while the upper end portion is installed between the left and right mowing transmission cylinders 13 and 13. The plate-like guide body 38 is supported by the guide body 38 so as to be movable in a guide hole 38a having a circular arc shape. Incidentally, the movement of the operating arm 37 in the guide hole 38a is smoothly performed by a bearing or the like engaged in the guide hole 38a.

  When the upper end of the operating arm 37 is moved to the end of the guide hole 38a that is closer to the swinging-side cutting transmission cylinder 13A ("tilting operating-side end"), the swinging-side cutting transmission cylinder 13A is extended to the maximum. Then, the swinging reaping device 4A is lowered to the “lowermost position”, and the swinging reaping device 4A is switched to the “maximum descending inclination posture” in which the swinging reaping device 4A is inclined downward as much as possible toward the left and right outer sides. Incidentally, in the illustrated example, the relative downward inclination angle with respect to the horizontal direction of the swing reaping device 4A switched to the maximum downward inclination posture is set to about 54 degrees.

  Then, from this state, when the upper end portion of the operating arm 37 is gradually moved toward the other end portion (“horizontal operating side end portion”) in the guide hole 38a, the cutting transmission cylinder 13A gradually shrinks, The swing mowing device 4A is gradually swung to a substantially horizontal posture, and when the upper end of the operating arm 37 is moved to the horizontal operating side end as much as possible, the mowing transmission cylinder 13A is reduced to the minimum, The swinging reaping device 4A rises to the “highest rising position” that is the same or substantially the same height as the horizontal reaping device 4B, and is switched to the horizontal “horizontal posture”.

  That is, the length of the cutting-side transmission cylinder 13A and the swinging posture of the swinging mowing device 4A are uniquely determined by the position of the upper end of the operating arm 37 in the arcuate guide hole 38a. The position of the upper end portion of the operating arm 37 in the guide hole 38a can be fixed by a fixing tool 39, and the fixing lever 39 can be fixed and released by a releasing lever 41.

  Further, the swing-side cutting transmission cylinder 13A is elastically biased toward the extension side by a compression spring (elastic member) 42 attached to the outer periphery of the swing-side cutting transmission cylinder 13A. However, the switching to the maximum downward inclination posture and the movement to the lowest downward position are always applied to the lower side and the horizontal cylinder 11 of the swinging side cutting transmission cylinder 13A. And is set by a setting wire 43 that lifts the swinging side cutting transmission cylinder 13A. Further, the lifting position can be changed by vertically swinging the setting operation lever 44 protruding rearward from the horizontal cylinder 11.

  That is, the height at which the lowering of the swing mowing device 4A is restricted by the swing of the setting operation lever 44 (the lowering restriction height) is set within a range between the lowest position and the highest position. The posture (tilt regulating posture) in which the downward tilting to the left and right outside of the swinging and cutting device 4A is regulated is set within a range between the maximum descending tilt posture and the horizontal posture. By the way, the swinging and cutting device that has been moved to the lowering regulation height and whose tilt regulation posture has been switched is in a state where it can be raised and switched to the horizontal posture in a state where the fixing by the fixture 39 is released. Become.

  Further, the vertically swinging position at which the setting operation lever 44 can be locked is installed on the rear cover 47 extending obliquely rearward and rearward from the rear end portion of the main cover 46 covering the upper surface side of the machine body 3 and the setting operation lever. A plurality of lever guides 48 are inserted through the middle portion 44, and the setting operation lever 44 is locked at any one of the plurality of predetermined vertical swing positions. Incidentally, an auxiliary cover 49 extends further rearward from the rear cover 47.

  Next, the configuration of the transmission device 16 will be described with reference to FIGS.

  FIG. 5 is a developed sectional view showing a transmission configuration of the transmission device. A longitudinal output shaft 51 disposed on the same axial center is rotatably supported in the vertical cylinder 8, and a lateral branch shaft 52 disposed on the same axial center is supported in the horizontal cylinder 11. Is rotatably supported, and a traveling transmission shaft 53 in the vertical direction arranged on the same axis is rotatably supported in the traveling transmission cylinder 12, and in the swing-side cutting transmission cylinder 13A, A vertical cutting transmission shaft (oscillating side cutting transmission shaft) 54 arranged on the same axis is rotatably supported, and the other cutting transmission cylinder (horizontal side cutting transmission shaft) 13B has the same axis. A vertical cutting transmission shaft (horizontal cutting transmission shaft) 56 disposed on the center is rotatably supported.

  The power generated by the engine 7 is output to the output shaft 51. Rotational power of the output shaft 51 rotates integrally with the bevel gear 57 provided to rotate integrally with the front end of the output shaft 51 facing the horizontal cylinder 11 and the branch shaft 52 so as to always mesh with the bevel gear 57. It is transmitted to the branch shaft 52 through a bevel gear 58 provided in a state.

  Further, the power of the branch shaft 52 is integrated with the branch shaft 52 so as to always mesh with the bevel gear 59 provided to rotate integrally with the front end portion of the traveling transmission shaft 53 facing the horizontal cylinder 11. It is transmitted to the traveling transmission shaft 53 via a bevel gear 61 provided in a rotating state. The power of the travel transmission shaft 53 is input into the mission case 9, and the drive shaft 24 is rotationally driven by the power input into the mission case 9 to drive the pair of left and right crawler travel devices 2, 2. .

  A bevel gear 62 is provided at the upper end of the swing side cutting transmission shaft 54 facing the horizontal shaft 11 so as to rotate integrally. The bevel gear 62 and the end of the branch shaft 52 on the swing side cutting transmission shaft 54 side are provided. The bevel gear 63 provided so as to rotate integrally with the unit is always meshed, and the power of the branch shaft 52 is transmitted to the swinging-side cutting transmission shaft 54.

  On the other hand, a bevel gear 64 is provided at the upper end of the horizontal cutting shaft 56 facing the horizontal cylinder 11 so as to rotate integrally. The bevel gear 64 and the end of the branch shaft 52 on the horizontal cutting shaft 56 side. The bevel gear 66 provided so as to rotate integrally with the unit is always meshed, and the power of the branch shaft 52 is transmitted to the horizontal cutting transmission shaft 56.

  The left and right cutting transmission shafts 54 and 56 drive the pair of left and right cutting devices 4A and 4B, respectively. Specifically, the pair of left and right cutting rotary bodies 28, 28 are rotationally driven in opposite directions so as to move rearward in the scraping space S formed between them. It is rotated together with the cutting rotator 28. Incidentally, the horizontal transmission shaft 56 serves as a cutting drive shaft for directly driving the cutting device 4B, with the above-described rotational axis Y serving as the axial center. Incidentally, the scraping space S is a space formed between the conveying rotators 29 and 29.

  FIG. 6 is a developed cross-sectional view showing the transmission configuration of the mission case. The power transmitted in the transmission case 9 by the traveling transmission shaft 53 is rotated in the transmission case 9 by a bevel gear 67 installed in a rotating state integrally with the rear end of the traveling transmission shaft 53 facing the transmission case 9. The intermediate shaft 68 is transmitted to the intermediate shaft 68 by a bevel gear 69 which is installed in a state of rotating integrally with the end portion of the intermediate shaft 68 in the left-right direction supported by the shaft and is always meshed with the bevel gear 67.

  The intermediate shaft 68 is disposed in parallel with the drive shaft 24 described above, and a pair of left and right intermittent gears 71 are supported in a midway portion of the intermediate shaft 68 so as to be freely rotatable (relatively rotatable). 9 is provided with a pair of left and right drive gears 72 that always mesh with the pair of left and right intermittent gears 71 and rotate integrally with the drive shaft 24.

  More specifically, the drive shaft 24 is provided for each of the left and right crawler type traveling devices 2, and the left and right drive shafts 24, 24 have the same axial center, and the end portions are relatively rotatable. Inserted and connected.

  The left drive gears 72, 72 are installed so as to rotate integrally with the left drive shaft 24, and the right drive gears 72, 72 are installed so as to rotate integrally with the right drive shaft 24. The gear 72 meshes with the left and right intermittent gears 71 individually.

  At the end of the intermediate shaft 68 opposite to the bevel gear 69 side, a sleeve 73 is externally mounted as a speed change member so as to be integrally rotatable and slidable in the axial direction. A claw-type traveling clutch 74 that meshes with each other is interposed therebetween.

  When the sleeve 73 is slid to the intermittent gear 71 side, the traveling clutch 74 is connected and operated, and the intermittent gear 71 and the intermediate shaft 68 rotate integrally, and the intermediate shaft 68 is connected to the drive shaft 24 and the traveling transmission shaft 53 is connected. Power is transmitted. On the other hand, when the sleeve 73 is slid to the side away from the intermittent gear 71, the travel clutch 74 is disconnected, and the intermittent gear 71 and the intermediate shaft 68 are rotated relative to each other (spinning state). Power transmission from 68 to the drive shaft 24 is interrupted. Incidentally, the two travel clutches 74 are intermittently connected and disconnected.

  The sleeve 73 is always elastically biased toward the connection side by an elastic member 76 such as a compression spring that is externally mounted. This intermittent operation is a shift operation that protrudes from the outside of the mission case 9 toward the sleeve 73 inside. The driving power is intermittently operated by a lever operation of a shift lever 79 connected to the shift operation shaft 77 by a linkage mechanism 78 such as a wire (see FIG. 4). Incidentally, the shift lever 79 is provided at a grip portion of the steering handle 7.

  When the airframe 3 is turned, the airframe 3 is swung upward and turned. However, in the state where the travel clutches 74 are disconnected, the left and right draif shafts 24 rotate about their respective axes, and therefore the rotational speed difference. Is generated by human power, and the body 3 can be easily turned.

  FIG. 7A is a cross-sectional view showing the structure of the swinging-side cutting transmission cylinder in a state of being minimized, and FIG. 7B is a cross-sectional view showing the structure of the swinging-side cutting transmission cylinder in a state of being extended to some extent. is there. The swing side cutting transmission shaft 54 is configured to be extendable and retractable in conjunction with the expansion and contraction of the swing side cutting transmission cylinder 13A. Specifically, the swing-side cutting transmission shaft 54 includes a cylindrical shaft 54a and an inner shaft 54b that is inserted into the cylindrical shaft 54a so as to be integrally rotated and slidable in the axial direction.

  The cylinder shaft 54a and the inner shaft 54b are both the same axis as the swinging side cutting transmission cylinder 13A, and are slidable in the axial direction and integrated with each other by spline coupling or key engagement (in the illustrated example, spline coupling). It is connected in a rotating state. Then, the swinging side cutting transmission shaft 13A expands and contracts by sliding in the axial direction of the inner shaft 54b with respect to the cylindrical shaft 54a, and this extending and contracting operation is interlocked with the extending and contracting operation of the swinging side cutting transmission tube 13A.

  The power of the swinging-side cutting transmission shaft 54 is driven by the bevel gear 81 installed in a state of rotating integrally with the lower end of the swinging-side cutting transmission shaft 54 facing the support case 34, and the support case 34 supports the power. The transmission shaft 82 is transmitted to the transmission shaft 82 via a bevel gear 83 that is installed in a state of rotation integrally with the transmission shaft 82 that is rotatably supported so as to have the same axis as the case 34 and that is always meshed with the bevel gear 81. . The movable case 36 described above rotates relative to the support case 34 around the transmission shaft 82 extending in the front-rear direction.

  The power of the transmission shaft 82 is directed in the entire length direction of the movable case 36 in the movable case 36 and the bevel gear 84 installed in a state of integral rotation at the front end portion of the transmission shaft 82 facing the movable case 36. It is transmitted to the cutting drive shaft 86 through a bevel gear 87 that is installed in a state of rotating integrally with the cutting drive shaft 86 that is rotatably supported in a state and is always meshed with the bevel gear 84. The reaping device 4A is reaped and driven.

  The drive speed of the reaping device 4 is set to be higher than the forward travel speed of the airframe 3 by the crawler travel device 2 by the transmission device 16.

  Next, the details of the reaping device 4 will be described with reference to FIGS.

  8 is a cross-sectional view showing the internal structure of the reaping device, FIG. 9 is a plan view showing the rotation trajectory of the rotator and the conveying rotator in the reaping device, and FIG. 10 shows the configuration of the cutting blade. It is a principal part top view. The cover body 31 is detachably attached and fixed to the lower end side of the cutting transmission cylinder 13 (specifically, the cutting transmission cylinder 13B or the movable case 36) with a bolt or the like. The cutting drive shafts 56 and 86 protrude downward from the lower end of the cutting transmission cylinder 13B or the movable case 36, and the cutting rotary body 28 and the transport rotary body 29 are attached to the protruding ends.

  In the cutting rotator 28, a plurality of cutting blades 88 projecting radially from the rotation axis S are arranged at an interval in the rotation direction (an even number, more specifically four in the illustrated example). . The interval formed between the adjacent cutting blades 88 is a space that is wide enough to allow one or a plurality of cutting objects such as grass (a plurality in the illustrated example) to intervene, specifically, 1/4. A cutting blade 88 is arranged for each circumference.

  The cutting blades 88 are respectively formed on both sides in the longitudinal direction of a metal elongated rectangular plate 89, and a plurality of one rectangular plate having the pair of cutting blades 88 at both ends are formed in the same shape (in the illustrated example). A pair), and the rectangular plates 89 are overlapped with each other so as to cross each other at the center (specifically, orthogonally) and fixed to the cutting drive shafts 56 and 86 with the mounting bolts 91 so as to be detachable. 88 is attached.

  Each cutting blade 88 is formed in a shape symmetric with respect to the rotation direction, and on the protruding end side (tip portion) 88a of the cutting blade 88 on the forward edge in the rotation direction (end on the front side in the rotation direction), A blade portion (working blade portion) 92A that is inclined toward the retreating side in the rotational direction toward the projecting direction is formed. On the other hand, at the edge part 88a of each cutting blade 88 on the backward side in the rotational direction (end part on the backward side in the rotational direction), a blade part inclined toward the forward side in the rotational direction toward the direction in which it protrudes ( A non-working side blade portion) 92B is formed.

  Incidentally, “the forward side in the rotational direction” here means the arcuate arrow direction in FIG. 9, and “the backward side in the rotational direction” means the opposite direction. With the above configuration, the blade portions 92A and 92B on both sides of the forward and backward movement in the rotational direction have the receding angle θ1 and the forward angle θ2 with respect to the rotational direction, respectively.

  The transport rotator 29 has a disc-shaped main body 29a centered on the rotation axis S and a protrusion 29b projecting radially outward from the main body 29a, and is entirely integrated with synthetic resin or metal. Is formed. A plurality of the protrusions 29b are arranged in the rotation direction at intervals (the same number as the cutting blades in the illustrated example).

  Specifically, the protrusions 29b are arranged at the same positions at the same intervals as the cutting blades 88, and the protruding amounts of the respective protrusions 29b from the cutting drive shafts 56 and 86 are set slightly smaller than the cutting blades 88. Yes. Furthermore, the width of the protrusion 29b gradually decreases toward the protruding tip end, and is set to be approximately the same as the cutting blade 88 at the tip.

  Further, a gap is formed between the adjacent protrusions 29b and 29b so that the object to be cut can be interposed, and this is the same as the adjacent cutting blades 88 and 88. Further, the conveying rotating body 29 (particularly the protrusion 29b) has a thickness d that is much higher than that of the cutting blade 88, and the specific number of the thickness d is about 25 mm. The cut object to be cut can be efficiently scraped backward.

  A concave portion 29c that is recessed downward is formed in the rotational axis S portion of the transport rotating body 29, and the lower end portion of the cutting transmission cylinder 13B or the movable case 36 is inserted into the concave portion 29c. By interposing an exterior member 93 that is externally mounted on the cutting drive shafts 56 and 86 between the lower end of the case 36 and the bottom surface of the recess 29c, and tightening the mounting bolt 91, the conveying rotating body 29 and the cutting rotating body 28 is attached and fixed to the cutting drive shafts 56 and 86 by being detachably fastened together. Further, the conveying rotating body 29 is detachably attached and fixed to the middle part of the cutting blade 88 by means of attachment bolts 94.

  The contact body 32 is divided into upper and lower parts, and the entire contact body 32 protrudes downward from the harvesting rotary body 28 into a hemispherical shape. Specifically, the upper divided body 96 is detachably fastened to the cutting blade 88 together with the conveying rotating body 29 by the mounting bolt 94 described above, and the lower divided body 97 is the same as the rotational axis S. The upper split body 96 is detachably mounted and fixed by a connecting bolt 98 serving as an axial center.

  Incidentally, the upper divided body 96 is formed in a hollow shape with the upper part opened, and in the state of being attached to the cutting blade 88, the mounting bolt 91, the mounting bolt 94 on the side that is not fastened together, etc. Is housed. Further, the connecting bolt 98 and the mounting bolt 94 for joint fastening are accommodated in a recess 32 a that is recessed upward from the lower surface of the contact body 32.

  Since the contact body 32 is close to or touches the ground, a predetermined clearance is formed between the cutting blade 88 and the ground during the cutting operation, and this clearance causes breakage of the cutting blade 88 and the rotation efficiency. Reduction is prevented.

  From the above-described configuration, the blade portions 92A and 92B are formed on both sides in the width direction (both edges in the rotational direction) of the cutting blade 88, respectively. 4, only the working blade 92A on the one side in the width direction of the cutting blade 88 is used for cutting the object to be cut due to the rotation direction described above. When installed on the other cutting device 4, the non-working blade portion 92B on the other side in the width direction of the cutting blade 88 becomes the aforementioned working blade portion 92B and is used for cutting the object to be cut. .

  This is the same for the protrusions 29b, and on both sides in the width direction of the protrusions 29b, there are formed scraping surfaces that come into contact with the object to be cut and rake back. Incidentally, a certain area is ensured on the scraping surface by the thickness d. While the conveying rotating body 29 is installed in the right and left one side of the cutting device 4, only the scratching surface on one side in the width direction of the protrusion acts as a tool for scavenging the object to be cut due to the rotation direction described above. However, when this transporting rotator 29 is installed in the right and left other side of the cutting device 4, the scratching surface on the other side in the width direction of the protrusion acts as a tool for scraping the cutting object.

  For this reason, if the left and right harvesting rotary bodies 28, 28 in a state where the sharpness is reduced due to wear and damage are interchanged, the sharpness is restored and the useful life of the harvesting rotary body 28 can be extended. If the left and right transport rotators 29.29 in a state where the scraping efficiency is lowered due to wear or wear are exchanged, the scraping efficiency is restored, and the service life of the transport rotator 29 can be extended.

  In order to make these exchanges possible, as described above, the cutting rotator 28 and the conveying rotator 29 are detachably attached to the machine body 3 side (specifically, the cutting transmission cylinder 13B or the movable case 36). Yes. Incidentally, in the removal of the cutting rotator 28 and the conveying rotator 29, first, the mounting bolt 94 and the connecting bolt 98 for joint fastening are removed, the contact body 32 is removed from the cutting blade 88, and then the mounting bolt 91 is removed. The cutting rotator 28 and the conveying rotator 29 may be collectively removed from the machine body 3 side.

  Then, as shown in FIG. 9, the pair of left and right harvesting rotary bodies 28 and 28 are arranged so that the rotation trajectories D1 and D1 of the cutting blade 88 partially overlap each other. As a result, the cutting range in the left-right direction of one of the cutting rotators 28 and the cutting range in the left-right direction of the other cutting rotator 28 are partially wrapped, and between the left and right cutting rotators 28, 28. It is configured so that there is no leftover.

  In addition, the pair of left and right transport rotators 29, 29 are in a state in which the rotation trajectories D2, D2 of the protrusion 29b are not overlapped with each other. The scraping range in the left-right direction of the rotating body 29 is close to each other and is in a non-wrapping state.

  Next, based on FIG.9 and FIG.11, the state of the cutting work using this mower 1 is explained in full detail.

  In this mower 1, when performing a cutting operation in a horizontal place, the swinging and cutting device 4A is switched to the horizontal posture, the fixing tool 39 is set in a fixed state, and the left and right crawlers 4 are cut and driven while cutting the left and right crawlers. The type traveling devices 2 and 2 are driven to travel in the same direction at the same speed, and the body 3 is advanced.

  A cutting object such as grass is cut between the adjacent cutting blades 88 and 88 and between the projections 29b and 29b and is cut by the rotating cutting blade 88 in the process of traveling forward. The cut object to be cut is efficiently scraped backward by the protruding portion 29b having the thickness d via the scraping space S side.

At this time, if the projecting portion 29b is integrated with the cutting rotator 28 and is driven to rotate at a speed much higher than the traveling speed, the lower part of the object to be cut is scraped at a speed much higher than the traveling speed. The upper side of the object to be harvested falls down forward, and in this lying state, the object to be harvested having a long heel length and a high height is placed in a low state and can be smoothly introduced into the gate-shaped inlet 17 for efficient conveyance. Front lodging of the cutting object, if long in height and object cutting, in the case of small aircraft 3 the height of the gate-shaped inlet 17 can not be secured, works particularly effectively.

  For the purpose of promoting lodging as described above, the drive speed of the cutting rotator 28 and the conveying rotator 29 (specifically, the speed of the tip of the cutting blade 88 and the speed of the tip of the protrusion 29b) is increased by the transmission device 16. The crawler type traveling device 2 is set at a higher speed than the forward traveling speed of the airframe 3. Specifically, it is set in the range of several times to several tens of times. Incidentally, the thickness d also greatly contributes to the scraping efficiency.

  Thus, the cutting object sent rearward from the scraping space S is cut and fallen forward, but has a thickness in the vertical direction. Since the pair of left and right crawler type traveling devices 2 disposed just behind the scraping space S step on and climb over the fallen cut object having this volume, the cut object is stepped in this process, Since it is forcibly separated from the left and right reaping devices 4, 4, there is almost no obstacle to the reaping work.

  In addition, since the object to be cut that has been stepped on by the crawler type traveling device 2 stays on the spot, the cut object to be cut is pushed forward by the body 3 to effectively prevent the cutting work efficiency from being lowered. Is done.

  Since the rotation trajectories D1 and D1 of the left and right harvesting rotary bodies 28 and 28 are wrapped in a plan view, uncutting is efficiently prevented, and the rotational trajectories D2 and D2 of the transport rotary bodies 28 and 28 are In plan view, it is in a non-wrapped state, and the occurrence of clogging of the cutting object in the overlapping range is efficiently prevented.

  FIG. 11 is a front view of a main part showing a cutting operation state on the inclined surface of the mower. When cutting an object to be cut on an inclined surface, set the direction of the airframe 3 so that the flat surface formed on the apex side of the inclined surface is a running surface and the swinging and cutting device 4A side faces the inclined surface. Then, the swinging and cutting device 4A is inclined downward along the inclined surface.

  At this time, the posture of the swinging and cutting device 4A may be fixed by the fixing tool 39, but the fixing by the fixing tool 39 is released, and the tilt control posture is set to be slightly steep by the setting operation lever 44 even by the inclined surface. You may let them. If it does in this way, the contact body 32 of 4 A of rocking | pulling cutting devices will elastically contact an inclined surface with the elastic force of the compression spring 42, and it will become possible to cut an inclined surface smoothly.

  If the posture of the swing reaping device 4A is determined as described above, the other operations are the same as the case where the reaping operation is performed in a horizontal place, and this makes it possible to perform the reaping operation smoothly and quickly. become. Incidentally, with respect to a flat traveling surface other than the inclined surface, the other horizontal reaping device 4B performs the reaping operation of the reaping object.

  According to the present mower 1 configured as described above, an object to be cut such as grass can be cut efficiently and quickly at various locations regardless of the height. It is possible and convenient. In addition, since the cutting rotator 28 and the transport rotator 29 are integrally formed and rotate at the same speed, the turbulence of the transport hardly occurs. From this point, the cutting operation can be efficiently performed. .

  By improving the cutting efficiency, it is not necessary to secure the maximum output of the engine 7 more than necessary, and it is possible to reduce it to less than half of the conventional (more specifically, about 1/3), and the weight of the main body is also halved. The following (more specifically, about 1/3) can be achieved.

  Note that the crawler type traveling devices 2 do not necessarily have to be provided in a pair on the left and right, and only one crawler traveling device 2 may be installed directly behind the scraping space S, as indicated by a virtual line in FIG.

  Further, as indicated by phantom lines in FIGS. 4 and 11, the side of the body 2 on the side of the inclined surface of the crawler type traveling device 2 or swinging for the purpose of preventing the body 3 from falling on the side of the inclined surface. On the side of the cutting device 4A, a rotatable contact wheel 99 that contacts the inclined surface may be provided, or a gauge wheel 101 that is connected to the front side of the machine body 2 and stabilizes the cutting height may be provided. Well, this makes it possible to stabilize the cutting height.

  FIGS. 12A and 12B are plan views showing rotation trajectories of a cutting rotator and a conveying rotator in another example of a pair of left and right reaping devices, respectively. In the example shown in FIG. 6A, the trajectories D1 and D1 of the cutting blades 88 of the left and right cutting rotators 28 and 28 are wrapped in a plan view. It is good also as a non-wrapping state visually. Even in this case, the left and right harvesting rotary bodies 28 and 28 are partially overlapped with each other in the right and left harvesting ranges, and therefore, uncutting can be prevented.

  Furthermore, as shown in FIG. 5B, in the examples so far, the left and right reaping devices 4 and 4 are arranged side by side in the left and right oblique directions, but the left and right reaping devices 4 and 4 (specifically, The left and right harvesting rotary bodies 28, 28 and the left and right harvesting conveyance bodies 29, 29) may be arranged side by side in the lateral direction. In this case, if the trajectories D1 and D1 of the cutting rotators 28 and 28 are not wrapped in plan view, the cutting range in the left and right directions does not wrap, but in this case, the cutting blades 88 do not interfere with each other. The phases are shifted from each other by a predetermined amount (45 degrees in this example).

2 Crawler type traveling device (traveling part)
3 Airframe
7 Engine (Power source)
16 Transmission device 28 Cutting rotator 29 Conveying rotator 42 Compression spring (elastic member)
88 Cutting blade 88a Tip 92A Working blade (blade)
92B Non-working side blade (blade)
D1 Rotation locus S Scratching space Y Rotation axis (Rotation center)

Claims (7)

An airframe (3) supported by a travel unit (2) driven to travel;
A pair of left and right cutting rotators (28) rotatably supported on the front side of the body (3);
A pair of left and right conveying rotators (29) supported rotatably on the right and left harvesting rotators (28), respectively;
The left and right cutting rotators (28) and the conveying rotator (29) are rotationally driven on the side where the object to be cut is scraped backward from the scraping space (S) formed between the left and right transport rotators (29). A drive device
The cutting rotator (28) has a plurality of cutting blades (88) that project radially from the center of rotation (Y) and rotate together.
The plurality of cutting blades (88) are arranged side by side in the rotational direction at intervals,
The left and right harvesting rotators (28) are arranged so that the left and right trimming ranges in the cutting blade (88) of the left and right harvesting rotators (28) partially overlap,
The drive device includes a power source (7), and a transmission device (16) that transmits the power of the power source (7) to each cutting rotator (28) and each transport rotator (29),
The drive device during cutting work, cutting so that the top of the object is laid down forward, the reaper rotating body (28), conveying rotating body disposed directly above the該刈preparative rotating body (28) (29) A mowing machine configured to be driven to rotate at a speed higher than the traveling speed of the traveling unit (2) by the transmission device (16) . The left and right cutting rotators (28) are arranged such that the rotation trajectories (D1) of the cutting blades (88) partially overlap each other in plan view, or the left and right cutting rotators (28). Are arranged so that the rotational trajectory (D1) of the cutting blade (88) deviates back and forth with each other in a state of non-wrapping in plan view, thereby partially overlapping the horizontal cutting range by the cutting blade (88). The mowing machine according to claim 1. The cutting blade (88) is shaped into a symmetrical shape in the rotational direction,
Blade portions (92A, 92B) are formed on both edges in the rotational direction of the cutting blade (88),
The cutting machine according to claim 1 or 2, wherein a cutting rotary body (28) having the cutting blade (88) is detachably supported on the machine body (3) side. The cutting operation according to any one of claims 1 to 3, wherein a blade portion (92A) that is inclined toward the backward side in the rotational direction is formed on an edge portion on the forward side in the rotational direction at the tip portion (88a) of the cutting blade (88). Machine. A pair of left and right traveling units (2) are placed behind the scraping space (S) and stepped on the object to be clipped behind by the left and right transport rotating bodies (29) to get over the pair of left and right or one The reaping machine according to claim 1, which is a crawler type traveling device. At least one of the left and right cutting rotary bodies (28) is supported on the machine body (3) side so as to be swingable in the left-right direction,
The cutting machine according to any one of claims 1 to 5, further comprising an elastic member (42) for elastically biasing the rotary rotator (28) toward a side inclined downward toward the left and right outer sides. The cutting rotator (28) and the conveying rotator (29) are supported on the machine body (3) side so as to be integrally rotatable,
The cutting machine according to any one of claims 1 to 6, wherein the cutting rotator (28) and the conveying rotator (29) are provided integrally or close to each other.

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