JP2008029241A - Lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn mower improved with a steering operability or mowing work operability of an operator. <P>SOLUTION: This lawn mower equipped with a mower device 16 loaded on a traveling machine body 1, a grass-collecting body 30 for collecting the mown grass 89 mown by the mower device 16, and a lifting mechanism 31 for supporting the grass-collecting body 30 on the traveling machine body as capable of lifting up and down, and while constituting for lifting the grass-collecting body 30 by the lifting mechanism 31 so as to discharge the mown grass in the grass-collecting body 30, also equipped with an engine-stopping mechanism 151 for stopping an engine 9 loaded on the traveling machine body 1, and a PTO (power take off)-operation body 18 for drive- or stop-operating the mower device 16 is constituted by equipping a PTO-on-detecting means 150, 164 for detecting the operation of the PTO operation body 18 for driving the mower device 16 and a parking brake-detecting means 154, 166 for detecting the on action of the parking brake 153 for maintaining the traveling part 6 of the traveling machine body 1 as a braked state so as to actuate the engine-stopping mechanism 151 by the driving operation of the mower device 16 of the PTO operation body 18 while the parking brake 153 is activated as on. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lawn mower provided with a mower device for cutting turf grass planted on the ground and a grass collecting body for collecting grass cut by the mower device, and more specifically, a lift mechanism is provided on a traveling machine body. It is related with the lawn mower which equipped the grassy body so that raising / lowering was possible.

  Conventionally, in general, a lawn mower has a mower device with a rotary cutting blade mounted on a traveling machine body so as to be movable up and down, a substantially cylindrical discharge duct extending rearward from the mower device, and a box-like shape communicating with the discharge duct. The grass turf and the like are continuously cut by the mower device, and the turf grass such as turf grass is discharged from the mower device to the grass collector through the discharge duct.

In this case, in the conventional lawn mower, when the grass cut in the grass collection unit is full, the grass collection unit is lifted above the container or truck bed, and the grass cut in the container or truck is discharged. The structure which does is adopted (for example, refer patent document 1). It is also known to stop the engine by raising the grass body while driving the mower device (see, for example, Patent Document 2).
JP 2002-84850 A JP-A-9-47134

  By the way, in patent document 1 or patent document 2, there exists a problem that a mower apparatus is driven by operation of a PTO operating body while a parking brake is applied and operated. Even when the parking brake is applied and operated while the mower device is being driven, there is a problem that the mower device continues to be driven. There is a problem that the mower device is driven by the operation of the PTO operation body while the grass collection body is supported at a position other than the grass collection position of the traveling machine body. While driving the mower device, there is a problem that the grass collection body moves up and down by the lifting operation or the lowering operation of the lift operation body. That is, the mower device is improperly driven by the operator's erroneous operation or the like, or the grass collection body is improperly moved up and down, and the operator's driving operability or mowing work operability cannot be improved.

  It is an object of the present invention to easily prevent the mower device from being improperly driven by the operator's mistaken operation or the like, and improperly raising and lowering the grass collection body, thereby improving the operator's driving operability or mowing work operability. A lawn mower that can be used is provided.

  In order to achieve the above object, a lawn mower according to a first aspect of the present invention includes a mower device mounted on a traveling machine body, a grass collecting body for collecting grass cut by the mower apparatus, and the grass collecting body on the traveling machine body. A lift mechanism that supports the lifter so as to be able to move up and down, and is configured to lift the grass collection body by the lift mechanism to discharge the cut grass in the grass collection body, while stopping the engine mounted on the traveling machine body A lawn mower comprising a mechanism and a PTO operating body for driving or stopping the mower device, a PTO entering detecting means for detecting an operation of the PTO operating body for driving the mower device, and the traveling machine body A parking brake detecting means for detecting an operation of applying a parking brake for maintaining the traveling portion of the vehicle in a braking state, and the PTO operating body during the operation of applying the parking brake By the mower device driving operation, which is constituted to operate the engine stop mechanism.

  According to a second aspect of the present invention, in the lawn mower according to the first aspect, the lawn mower includes a seating detection unit that detects that an operator has sat on the driving seat of the traveling machine body, and the mower device is being driven. The engine stop mechanism is configured to be operated at least one of when the parking brake is turned on and when the operator leaves the driver's seat.

  The invention described in claim 3 is the lawn mower according to claim 1, further comprising grass collection detection means for detecting the grass collection body supported by the grass collection position of the traveling machine body, and the grass collection position of the traveling machine body. The engine stop mechanism is activated by the mower device driving operation of the PTO operation body in a state where the grass collection body is supported at a position other than.

  According to a fourth aspect of the present invention, in the lawn mower according to the first aspect, a lift operating body that moves up and down the grass collection body and at least one or both of an ascending operation and a lowering operation of the lift operating body are detected. And a lift detecting means for operating the engine stop mechanism by driving the lift operating body up or down while driving the mower device.

  According to the invention which concerns on Claim 1, the mower apparatus mounted in the traveling body, the grass collection body which collects the grass cut by the mower apparatus, and the lift mechanism which supports the grass collection body so that the traveling body can be moved up and down An engine stop mechanism for stopping an engine mounted on the traveling machine body, and driving the mower device. Or, in a lawn mower comprising a PTO operating body for stopping operation, a PTO entering detecting means for detecting an operation of the PTO operating body for driving the mower device and a traveling part of the traveling body are maintained in a braking state. A parking brake detecting means for detecting an operation of applying a parking brake for performing the operation of driving the mower device of the PTO operating body during the operation of applying the parking brake. Since the engine stop mechanism is configured to operate, the engine can be stopped by an erroneous operation of the PTO operation body, and it is easy to improperly drive the mower device due to an operator's erroneous operation or the like. Therefore, the operator's driving operability or mowing work operability can be improved.

  According to a second aspect of the present invention, there is provided seating detecting means for detecting that an operator is seated on the driver's seat of the traveling machine body, and when the parking brake is turned on while the mower device is being driven, or Since the engine stop mechanism is configured to be activated by at least one of the operator leaving from the driver's seat, the engine can be stopped by an erroneous operation of the parking brake, It is possible to easily prevent the mower device from being driven inappropriately and to improve the operator's driving operability or mowing work operability.

  According to the invention which concerns on Claim 3, it has the grass collection detection means which detects the said grass collection body supported by the grass collection position of the said traveling body, and the said grass collection body is supported in positions other than the grass collection position of the said traveling body. In this state, the engine stop mechanism is actuated by the mower device driving operation of the PTO operating body. Therefore, the engine can be stopped by an erroneous operation of the PTO operating body. Therefore, it is possible to easily prevent the mower device from being driven inappropriately, and to improve the driving operability of the operator or the operability of mowing work.

  According to the invention according to claim 4, the lift operating body for raising and lowering the grass collection body, and a lift detecting means for detecting at least one or both of the lifting operation and the lowering operation of the lifting operation body, While the mower device is being driven, the engine stop mechanism is actuated by raising or lowering the lift operation body. Therefore, the engine can be stopped by an erroneous operation of the lift operation body, and an erroneous operation by the operator Thus, it is possible to easily prevent the mower device from being driven inappropriately, and to improve the driving operability of the operator or the operability of mowing work.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. 1 is a side view of a lawn mower, FIG. 2 is a plan view of the lawn mower, FIG. 3 is a side view showing a rear part and a grass collecting body of a traveling machine body, FIG. 4 is a rear view showing a lift mechanism, and FIG. 5 is a lift of FIG. FIG. 6 is a partially enlarged view of the mechanism, FIG. 6 is a side view showing the discharge of the cut grass of the grass collection body, and FIG. 7 is a hydraulic circuit diagram. As shown in FIGS. 1 and 2, in the lawn mower of this embodiment, the traveling machine body 1 includes left and right machine body frames 3, 4 that are integrally connected via a plurality of horizontal rail frames (not shown). I have. The body frames 3 and 4 are supported by left and right front wheels 5 and left and right rear wheels 6 arranged in front and rear of the left and right sides.

  An engine 9 as a power source is built in the hood 8 on the upper side of the front cowl 7 that covers the front upper surface of the traveling machine body 1. A steering column portion 11 having a round steering handle 10 is mounted on the upper side of the rear portion of the bonnet 8. A shift pedal 12 for appropriately adjusting the vehicle speed and a brake pedal 13 for braking the traveling machine body 1 are disposed below the right side in the traveling direction of the steering column unit 11.

  A driver seat 15 is provided on the rear cowl 14 that covers the rear upper surface of the traveling machine body 1. When the operator sitting on the driver's seat 15 rotates the steering handle 10, the hydraulic torque generator 2 for power steering is operated according to the operation amount (rotation amount), and the left and right front wheels 5 are operated. The steering angle (steering angle) is changed. On the left side of the driver's seat 15, a mower elevating lever 17 for elevating and lowering a mower device 16 described later is provided so as to be able to rotate back and forth. A PTO clutch lever 18 for driving or stopping the mower device 16 is provided on the right side of the driver seat 15 so as to be able to rotate back and forth.

  In the rear cowl 14, a mission case 19 having a hydrostatic continuously variable transmission 95 (HST type), which will be described later, is disposed. An inclined portion having a front, low, rear, and high shape is formed at the rear of the body frames 3 and 4, and the mission case 19 is supported at an intermediate portion of the front and rear width of the inclined portions of the body frames 3 and 4. The mission case 19 is configured to transmit power from the engine 9 to the left and right rear wheels 6 by appropriately shifting power from the engine case 19. A fuel tank 20 that supplies fuel to the engine 9 is mounted at the rear end of the inclined portion of the body frames 3 and 4. An oil tank 21 that supplies hydraulic oil to the hydrostatic continuously variable transmission 95 of the mission case 19 is mounted outside the inclined portion of the right body frame 4. On the side opposite to the oil tank 21, a battery 22 used for starting the engine 9 is mounted outside the inclined portion of the left body frame 3 so as to sandwich the fuel tank 20.

  A mower device 16 for mowing the lawn mower 16 is mounted between the front left and right front wheels 5 and the left and right rear wheels 6 of the lower surfaces of the body frames 3 and 4 through the front and rear link rods 23 and 24. ing. The mower device 16 includes a pair of left and right rotary cutting blades 26 that can be rotated horizontally in a mower case 25 having a downward-opening hook shape. Further, four front and rear gauge wheels 27 that adjust the height of the mower device 16 when lowered are attached to the front and rear sides of the left and right sides of the mower case 25. A duct portion 28 that opens rearward is provided on the upper surface of the mower case 25.

  The duct portion 28 communicates with the front side of the discharge duct 29 disposed between the left and right rear wheels 6 on the lower surfaces of the body frames 3 and 4. Further, the rear side of the discharge duct 29 is connected to a grass collection box 30 as a grass collection body. The grass collection box 30 is formed by stretching a mesh sheet into a box shape. A grass collection box 30 is supported by a lift mechanism 31 disposed at the rear of the traveling machine body 1 so as to be movable up and down. Mowed grass such as turf grass cut by the rotary cutting blade 26 in the mower case 25 is conveyed from the duct portion 28 to the inside of the grass collection box 30 through the discharge duct 29 by the wind of the rotary cutting blade. The cut grass is collected in the grass collection box 30.

  Next, the power transmission system of the lawn mower will be described with reference to FIGS. 1 and 2. In the lawn mower of this embodiment, a two-wheel drive system is adopted in which a part of the rotational power of the engine 9 is distributed to the left and right rear wheels 6. That is, a part of the rotational power of the engine 9 is forward from the rear end portion of the output shaft 32 protruding forward and backward outward from the engine 9 and the propulsion shaft 33 having universal joints at both front and rear ends and the transmission case 19. Is transmitted to the transmission case 19 via the traveling transmission relay case 34 and the endless input belt 35 disposed in the region. The left and right axles 38 provided at the rear side portion of the traveling machine body 1 through the left and right endless rear wheel drive chains 37 from the horizontal left and right rear wheel drive shafts 36 projecting left and right outward from the transmission case 19. Is transmitted to. As a result, the left and right rear wheels 6 attached to the left and right axles 38 are rotationally driven. Left and right axle frames 39 are respectively provided at rear portions of the left and right body frames 3 and 4, and left and right axles 38 are disposed on the left and right axle frames 39. The discharge duct 29 extends between the left and right axle frames 39 in the front-rear direction.

  As shown in FIG. 1, the cut turf grass is transported between a mower device 16 as a mowing unit disposed on the lower surface side of the traveling machine body 1 and a grass collection box 30 disposed behind the traveling machine body 1. For this purpose, the transmission case 29 is extended to the front, lower, and rear high above the discharge duct 29 to support the transmission case 19 so that the transmission case 19 is inclined to the front low and high. Since the lift mechanism 31 is arranged on the rear traveling machine body 1 via the axle frame 39, the ventilation cross-sectional area (vertical width dimension and horizontal width dimension) of the discharge duct 29 is formed to a predetermined size to clog the cut grass. The lift mechanism 31 can be supported with high rigidity with a simple assembly structure on the traveling machine body 1.

  On the other hand, the other rotational power of the engine 9 is transmitted from the front end portion of the output shaft 32 to the PTO shaft 42 pivotally supported on the front portion of the body frame 4 via the endless PTO transmission belt 41 for PTO power transmission. . Next, power is transmitted from the PTO shaft 42 to a mower gear box 44 disposed on the right side of the body frame 4 on the upper surface of the mower case 25 through an intermediate shaft 43 having universal joints at both front and rear ends. . As a result, the left rotary cutting blade 26 in the mower case 25 is driven to rotate clockwise in plan view, the right rotary cutting blade 26 is driven to rotate counterclockwise in plan view, and the left and right rotary cutting blades 26 are used to cut turf grass and the like. However, the cut grass such as the cut turf grass is collected in the center of the left and right width of the mower case 25 and discharged from the duct portion 28 to the discharge duct 29.

  In addition, with the above configuration, the power of the engine 9 is transmitted to the transmission case 19 by one propulsion shaft 33, and the ventilation cross-sectional area (vertical width dimension and horizontal width dimension) of the discharge duct 29 is set to a predetermined value. In order to ensure the size, the propulsion shaft 33 can be disposed low by the vertical transmission dimension of the transmission relay case 34 in a state where the transmission case 19 is disposed at a high part of the traveling machine body 1. Even if the propulsion shaft 33 is disposed below the floor (step) of the traveling machine body 1 on which the operator who sits on the driver's seat 15 puts his / her foot, the floor (step) of the traveling machine body 1 can be formed low. . Therefore, the power transmission mechanism to the transmission case 19 can be simply configured, the large discharge duct 29 is arranged at the center of the left and right width of the traveling machine body to facilitate the discharge of the cut grass to the rear, and There is an effect that the operator can easily get on and off the driver seat 15 at the same time.

  Next, the structure of the lift mechanism 31 will be described with reference to FIGS. 3 to 5. As shown in FIGS. 3 and 4, the lift mechanism 31 is supported so as to be able to move up and down with respect to the left and right fixed masts 45, which are parallel to the right and left fixed masts 45, which are arranged substantially vertically on the rear side of the traveling machine body 1. The left and right movable masts 46, the lift frame 47 supported so as to be movable up and down with respect to the left and right movable masts 46, and the single hydraulic lift cylinder that moves up and down the movable mast 46 and the lift frame 47 48.

  As shown in FIGS. 3 to 5, on the front side of the left and right fixed masts 45, a square pipe shaped mast support that is inserted from the rear end side into the square shaped inner holes of the square pipe shaped body frames 3, 4 45a. The mast support 45a is fitted into the body frames 3 and 4, the left and right body frames 3 and 4 are supported by the left and right fixed masts 45, and the lower end sides of the left and right fixed masts 45 are arranged at the rear end sides of the left and right axle frames 39. Are fastened with bolts 49. The mounting width of the left and right fixed masts 45 is larger than the left and right width of the discharge duct 29 and smaller than the interval between the left and right rear wheels 6. That is, the left and right fixed masts 45 are disposed between the left and right outer surfaces of the discharge duct 29 and the left and right rear wheels 6 in a rear view (see FIG. 4).

  Both end sides of a pipe-like pedestal frame 50 that is long on the left and right are integrally connected to an intermediate portion of the vertical height of the left and right fixed masts 45 by welding. The lower end side of the lift cylinder 48 is connected to the middle portion of the left and right widths of the base frame 50 via the receiving bolt 51. The table frame 50 is disposed at a position higher than the upper surface of the discharge duct 29, and the auxiliary duct 52 is fixed to the lower surface side of the table frame 50. During the mowing operation, the gap formed between the discharge duct 29 and the grass collection box 30 is closed by the auxiliary duct 52 to prevent the grass from leaking from between the discharge duct 29 and the grass collection box 30 to the outside. It will be possible. Note that a cutout (not shown) through which the auxiliary duct 52 can pass in the vertical direction is formed on the bottom surface of the grass collection box 30. The grass collection box 30 rises or descends without the bottom surface of the grass collection box 30 coming into contact with the auxiliary duct 52.

  As shown in FIG. 5, both end sides of a support frame 53 that is long to the left and right and a bearing plate body 54 are integrally connected to upper ends of the left and right fixed masts 45 by welding. An intermediate portion of the lift cylinder 48 is fixed to the support frame 53 via a U-shaped bolt 53a. A lift cylinder 48 is erected at a middle portion between the left and right fixed masts 45 so as to be substantially parallel to the fixed mast 45. The piston rod 55 protrudes upward from the upper end of the lift cylinder 48.

  As shown in FIGS. 3 to 5, the left and right movable masts 46 are slidable in the vertical direction outside the left and right fixed masts 45 via a plurality of guide wheels 56. The left and right movable masts 46 are connected via a crosspiece frame 57 and slide integrally in the vertical direction. Left and right lift wires 58 and 59 are connected between the support frame 53 and the left and right movable masts 46 as described later.

  Both ends of the left lift wire 58 are connected to the lower end of the left movable mast 46 in the forward direction of the traveling machine body 1 via the wire fixture 60. An intermediate portion of the left lift wire 58 is wound around a folding pulley 63 provided on the support frame 53 via a tension adjusting bolt 61 and a bearing body 62. Two pulleys 64a and 64b provided on the upper end portion of the left fixed mast 45 via the bearing plate 54 and pulleys on both sides of the triple pulley 66 provided on the upper end portion of the piston rod 55 via the support shaft 65. A left lift wire 58 indicated by a two-dot chain line in FIG. 5 is stretched doubly between the wire fixture 60 and the folding pulley 63 via 66a and 66b.

  On the other hand, one end portion of the right lift wire 59 is connected to the lower end portion of the right movable mast 46 in the forward direction of the traveling machine body 1 via a wire fixture 67. The other end of the right lift wire 59 is connected to a tension adjustment bolt 68 provided on the support frame 53. Via a pulley 69 provided on the upper end of the right fixed mast 45 via a bearing plate 54 and a central pulley 66c of a triple pulley 66 provided on the upper end of the piston rod 55 via a support shaft 65. Then, a right lift wire 59 indicated by a one-dot chain line in FIG. 5 is stretched between the wire fixture 67 and the tension adjustment bolt 68 in a single manner.

  That is, with the above configuration, when the piston rod 55 is advanced upward and the triple pulley 66 is lifted, the left and right movable masts 46 are lifted with a double lift stroke with respect to the piston rod 55 advance stroke. It will be. Also, the left lift wire 58 is stretched double (two), and the right lift wire 59 is stretched single (single), so that the piston rod 55 generates a rotational force around its axis. Even so, against the rotational force, the rotation of the piston rod 55 around the axis is blocked by the left lift wire 58. Therefore, twisting of the wires 58 and 59 at the pulley 66 can be prevented. When the left lift wire 58 and the right lift wire 59 are formed of the same diameter wire, the right movable mast 46 (single lift wire 59) is supported in the forward direction of the traveling machine body 1. Due to the force, the support force of the left movable mast 46 (double lift wire 58) in the forward direction of the traveling machine body 1 increases.

  As shown in FIGS. 3 to 5, a lift frame body 47 is arranged outside the left and right movable masts 46 via a plurality of guide wheels 70 so as to be slidable in the vertical direction. The lift frame 47 includes left and right fork bodies 71 extending substantially horizontally in the front-rear direction, and a dump fulcrum shaft 72 that rotatably supports the grass collection box 30 described above. The lift frame body 47 supported by the left and right movable masts 46 is connected to the front end sides of the left and right fork bodies 71, and the dump fulcrum shaft 72 is disposed on the rear end side of the left and right fork bodies 71, and is directed toward the rear of the traveling machine body 1. Thus, the grass collection box 30 is rotated around the dump fulcrum shaft 72.

  Further, both ends of the left and right pull-up wires 74 are connected to a tension adjusting bolt 73 provided on the left and right outer sides of the lift frame 47 and the left and right bearing plate bodies 54. The left and right pulling wires 74 shown by broken lines in FIG. 5 are stretched through pulling pulleys 75 provided at the upper ends of the left and right movable masts 46, respectively. The lift frame 47 is lifted by a lift stroke twice as high as the lift stroke of the movable mast 46.

  That is, the lift frame body 47 is raised with an ascending stroke four times the advance stroke of the piston rod 55. Therefore, by using an inexpensive lift cylinder 48 with a short advancing / retreating stroke of the piston rod 55, the lifting / lowering stroke of the grass collecting box 30 can be made large, and the collecting posture position from the rear of the traveling machine body 1 to the high discharging posture position is collected. The grass box 30 can be raised by the maximum lift height H (see FIG. 4).

  Next, the structure of the grass collection box 30 is demonstrated, referring FIG.3 and FIG.6. As shown in FIGS. 3 and 6, the grass collection box 30 includes a grass collection body 76 that communicates with the discharge duct 29 and a lid 77 that closes the opening on the rear surface side of the grass collection body 76 so as to be openable and closable. Have. A quadrilateral box-shaped grass collection box 30 is formed by combining a side-view trapezoidal grass collection body 76 with a side-view triangular-shaped lid 77.

  A rear end portion of the bottom surface of the grass collection body 76 (a lower end portion on the rear surface opening side of the grass collection body 76) is connected to the dump fulcrum shaft 72. A hydraulic dump cylinder 78 is arranged outside the left fork body 71 in the forward direction of the traveling machine body 1. The dump cylinder 78 is coupled to the left fork body 71 via a cylinder coupling shaft 78a. A tip end portion of a piston rod 80 of a dump cylinder 78 is connected by a shaft 81 to a dump arm 79 provided at a left end portion of the dump fulcrum shaft 72. By advancing the piston rod 80, the grass collection body 76 is rotated rearward around the dump fulcrum shaft 72 so that the flat bottom surface of the grass collection body 76 has a front height so that the front side is high and the rear side is low. The rear side of the grass collection body 76 is inclined downward and opened rearward and obliquely downward (see FIG. 6).

  An opening / closing fulcrum shaft 83 is disposed at the rear end portion of the upper surface frame 82 of the grass collection body 76 (the upper end portion on the rear surface opening side of the grass collection body 76). The front end of the upper surface of the lid 77 is connected to the opening / closing fulcrum shaft 83. The lid 77 rotates around the opening / closing fulcrum shaft 83 and moves to the open position or the closed position. One end side of a pair of left and right opening / closing operation arms 84 is connected to the left and right ends of the opening / closing fulcrum shaft 83 projecting to the left and right sides of the grass collecting body 76. Both end sides of the opening / closing operation link 87 are connected to the fork body 71 in front of the dump fulcrum shaft 72 and the other end side of the opening / closing operation arm 84 extended forward from the opening / closing fulcrum shaft 83 via shafts 85 and 86, respectively. To do. The opening / closing link mechanism 88 formed by the pair of left / right opening / closing operation arms 84 and the pair of left / right opening / closing operation links 87 is interlocked with the rotation of the grass collection main body 76 around the dump fulcrum shaft 72 (see FIG. 6).

  That is, when the grass collecting body 76 is rotated rearward about the dump fulcrum shaft 72 and moved to the cut grass discharging position, the opening / closing fulcrum shaft 83 is rotated rearward about the dump fulcrum shaft 72 and the opening / closing fulcrum shaft 83 is moved. The arm 85 moves in a direction away from the shaft 85, and the opening / closing operation arm 84 is pulled by the opening / closing operation link 87 having a predetermined length. Therefore, the lid 77 is rotated rearward around the opening / closing fulcrum shaft 83 by the opening / closing link mechanism 88, and the lid 77 is moved to the open position (solid line position in FIG. 6). Then, the grass collection body 76 and the lid body 77 are connected to each other via the opening / closing fulcrum shaft 83 in a state of being bent in a U-shape, whereby the rear surface opening of the grass collection body 76 is opened rearward and obliquely downward. In addition, since the front opening of the lid body 77 is opened forward and obliquely downward, the grass collection body 76 and the mowing grass 89 inside the lid body 77 fall to the approximate center of the upper surface opening of the container 90 below. (See FIG. 6).

  On the other hand, when the dump cylinder 78 is operated and the piston rod 80 is retracted, the grass collection body 76 rotates forward around the dump fulcrum shaft 72 and returns to the cut grass collection position. In conjunction with the rotation around the dump fulcrum shaft 72, the lid 77 is rotated forward around the opening / closing fulcrum shaft 83 by the opening / closing link mechanism 88, and the lid 77 returns to the closed position (solid line position in FIG. 3). It will be.

  Next, the hydraulic circuit 91 of the lawn mower according to this embodiment will be described with reference to FIG. As shown in FIG. 7, a charging hydraulic pump 92 and a variable displacement type shifting hydraulic pump 93 that are operated by the rotational force of the engine 9, and a constant pressure that is operated by high-pressure hydraulic oil discharged from the hydraulic pump 93. And a displacement type hydraulic motor 94 for shifting. A hydraulic continuously variable transmission 95 is formed by the transmission hydraulic pump 93 and the transmission hydraulic motor 94, and the above-described transmission continuously variable transmission 95 is built in the transmission case 19, and the rotational force of the engine 9 is shifted to change the left and right. To the rear wheel 6.

  As shown in FIG. 7, the transmission hydraulic pump 93 and the transmission hydraulic motor 94 are connected to the suction side and the discharge side via a closed loop oil passage 96. By adjusting the angle of the swash plate 97 of the speed change hydraulic pump 93 driven by the power of the engine 9 with the speed change pedal 12, the rotational speed of the axle 38 driven via the speed change hydraulic motor 94 is changed. The Therefore, the rotational speed of the rear wheel 6 driven via the axle 38 is changed.

  As shown in FIG. 7, the hydraulic circuit described above includes a relief valve, an oil filter, a check valve, and the like. A strainer 99 inside the oil tank 21 as a hydraulic oil tank is connected to the suction side of the charging hydraulic pump 92 via a low pressure charge oil passage 98. Connected to the discharge side of the charge hydraulic pump 92 is a high-pressure charge oil passage 102 provided with a replenishment relief valve 100 and a return relief valve 101. The high-pressure charge oil passage 102 is connected to the closed-loop oil passage 96 through a relief valve 100 for replenishment, a check valve 103 for forward replenishment, a check 104 valve for reverse replenishment, and the like.

  Therefore, the hydraulic oil from the charging hydraulic pump 92 is always supplied to the closed loop oil passage 96 while the engine 9 is operating. Further, when the hydraulic oil in the charge oil passages 98 and 102 for supplying the closed-loop oil passage 96 from the charge hydraulic pump 92 is left, the hydraulic oil in the charge oil passages 98 and 102 is oiled through the return relief valve 101. It will be returned to the tank 21.

  On the other hand, a bypass valve 105 for short-circuiting the suction side and discharge side of the transmission hydraulic pump 93 and the suction side and discharge side of the transmission hydraulic motor 94 is connected to the closed loop oil passage 96. By operating the bypass switching lever 106, the bypass valve 105 is brought into a state where the suction side and discharge side of the transmission hydraulic pump 93 and the suction side and discharge side of the transmission hydraulic motor 94 are shut off (the state of the bypass valve 105 in FIG. 7). Is switched, the transmission hydraulic pump 93 and the transmission hydraulic motor 94 are connected to the traveling drive state, and the rear wheel 6 is driven by the rotational force of the engine 9.

  On the other hand, when the bypass valve 105 is switched to a state in which the suction side and the discharge side of the transmission hydraulic pump 93 and the suction side and the discharge side of the transmission hydraulic motor 94 are short-circuited by operating the bypass switching lever 106, the transmission hydraulic pressure is changed. The motor 94 can be kept in a free rotation state (a state in which the motor 94 rotates with no load). For example, when the rear wheel 6 cannot be driven by the power of the engine 9 due to a failure such as the lack of fuel in the fuel tank 20, the operator operates the bypass switching lever 106 to switch the bypass valve 105 to change the mission case 19. The continuously variable transmission 95 is kept in an unloaded state, and the operator can move by pushing the traveling machine body 1.

  As shown in FIG. 7, the charging hydraulic pump 92 is connected to the lifting hydraulic lift valve 107 for supplying hydraulic oil to the double-acting lift cylinder 48 for raising and lowering the grass collection box 30 to prevent malfunction. The valve 108 is connected. A dump valve 109 for discharging the grass 89 in the grass collection box 30 is connected to the tank port of the lift valve 107. Therefore, when the operator operates the lift lever 110 to switch the lift valve 107 and actuate the lift cylinder 48, the grass collection box 30 in the grass collection position is raised. Further, when the operator operates the dump lever 111 to switch the dump valve 109 and activate the dump cylinder 78, the grass collection box 30 is dumped as shown in FIG. Will be released.

  When the release of the cut grass in the grass collection box 30 is completed, the operator operates the dump lever 111 to return the grass collection box 30 to the support position of the lift frame 47, and then the operator operates the lift lever 110. Thus, the grass collection box 30 is returned to the grass collection posture position at the rear of the traveling machine body 1, and the mowing work for cutting turf grass and the like is resumed.

  Connected to the tank port of the dump valve 109 is a torque generator 2 for power steering for generating a large oil pressure by operating the steering handle 10 and steering the front wheel 5 by the large oil pressure. Yes. The torque generator 2 is connected to the return relief valve 101 via a parallel line filter 112 and a relief valve 113, and hydraulic oil from the torque generator 2 is supplied to the oil tank 21 via the line filter 112. Will be returned. The torque generator 2 includes a control valve that is switched by operating the steering handle 10 and a hydraulic pump that is operated by the control valve. The torque generator 2 uses the rotational force of the hydraulic pump to move the front wheel 5 in a direction. It is configured to be converted.

  Therefore, the lift valve 107, the dump valve 109, and the torque generator 2 are connected in series to the charging hydraulic pump 92, respectively. While the lift valve 107 is switched and the lift cylinder 48 is operating, the dump cylinder 78 and the torque generator 2 are not operated. While the dump valve 109 is switched and the dump cylinder 78 is operating, the torque generator 2 is not operated. When the lift cylinder 48 and the dump cylinder 78 are not operated, the torque generator 2 is operated. That is, since the lift cylinder 48 is operated with priority over the dump cylinder 78 and the torque generator 2 and the dump cylinder 78 is operated with priority over the torque generator 2, the charging hydraulic pump 92 has a small capacity. An inexpensive hydraulic pump (small output) can be used, and the manufacturing cost of the hydraulic device can be reduced.

  Next, the mounting structure of the lift lever 110 and the dump lever 111 will be described with reference to FIGS. 8 and 9, a hydraulic piping block 114 for connecting hydraulic piping (not shown) to the charging hydraulic pump 92, the lift cylinder 48 and the dump cylinder 78, and a lift valve 107 and a dump valve 109 are incorporated. A hydraulic valve unit body 115 and a hydraulic unit case 116 in which the hydraulic piping block 114 and the hydraulic valve unit body 115 are provided are provided.

  The lower surface side of the hydraulic valve unit body 115 is integrally fixed to the upper surface side of the hydraulic piping block 114. The hydraulic unit case 116 is installed on the upper surface side of the rear portion of the rear cowl 14 via the right body frame 4 (see FIG. 1). A hydraulic unit case 116 is disposed obliquely rearward on the right side of the driver seat 15 (see FIG. 2).

  As shown in FIGS. 8 to 11, the lift lever 110 and the dump lever 111 are arranged on the front surface of the hydraulic valve unit body 115 through the lever bearing portion 117 so as to be movable in the vertical direction. The lift lever 110 (dump lever 111) protrudes substantially horizontally toward the front of the hydraulic valve unit body 115 when the lift valve 107 (dump valve 109) is in a neutral state. The operator holds the lift lever 110 (dump lever 111), pivots the lift lever 110 (dump lever 111) upward or downward with the lever bearing portion 117 as a fulcrum, and lifts the lift valve 107 (dump valve 109) upward. Alternatively, switching to the lowering side (opening side or closing side) is performed, and the lift cylinder 48 (dump cylinder 78) is operated to the rising side or lowering side (opening side or closing side).

  As shown in FIGS. 8 and 9, a lever guide body 118 that pivotally guides the lift lever 110 and the dump lever 111 upward or downward, and a lock arm body that is coupled to the brake pedal 13 via a brake detection wire 119. 120 and a check arm body 121 that restricts the switching operation of one of the lift lever 110 and the dump lever 111 by the switching operation of the other. A lock arm body 120 and a check arm body 121 are pivotally supported by a lever guide body 118 provided in the hydraulic unit case 116 via a support shaft 122 so as to be rotatable.

  As shown in FIG. 9, the lock arm body 120 is formed with a cut grass discharge regulation notch 120 a that engages an intermediate portion of the lift lever 110. The check arm body 121 is formed with a lift check notch 121a for locking the intermediate portion of the lift lever 110 and a dump check notch 121b for locking the intermediate portion of the dump lever 111. In addition, a pair of pressure rolls 123 and 124 that are brought into contact with the intermediate portion of the lift lever 110 are pivotally supported on the check arm body 121 via roll shafts 125 and 126. The pair of pressure rolls 123 and 124 are arranged so as to sandwich the lift check notch 121a.

  As shown in FIG. 9, a brake detection spring 127 having a pinch spring shape in which one end side 127 a is locked to the lock arm body 120 and the other end side 127 b is locked to a connecting pin 129 described later, 110, a brake detection spring 127 that rotates the lock arm body 120 in a direction in which the cut grass discharge regulation notch 120a is separated from the cutting lever 110, and a tension for rotating the check arm body 121 in a direction in which the dumping restraint notch 121b is separated from the dump lever 111. And a spring-like release spring 128.

  As shown in FIGS. 8 and 9, a connection fitting 130 at one end of the brake detection wire 119 is connected to one end of the lock arm body 120 with the intermediate portion fitted on the support shaft 122 via a connection pin 129. It is locked. A stopper body 131 for supporting the lock arm body 120 is integrally formed on the other end side of the lock arm body 120 at a position where the cut grass discharge regulation notch 120 a is separated from the lift lever 110.

  The connecting pin 129 is engaged with the other end side 127b of the brake detection spring 127 in which the one end side 127a is engaged with the lock arm body 120. Both end sides of the release spring 128 are locked to the roll shaft 125 and the connecting pin 129, respectively. Note that the spring force of the brake detection spring 127 is made smaller than the spring force of the pedal return spring (not shown) that maintains the brake pedal 13 at the initial position (brake release position). Further, the spring force of the release spring 128 is made smaller than the spring force of the brake detection spring 127.

  With the above configuration, as shown in FIG. 9, when the brake pedal 13 is maintained at the initial position (brake release position) by a pedal return spring (not shown), the pedal return for maintaining the brake pedal 13 at the initial position is performed. Since the brake detection wire 119 is pulled by the spring force of the spring, the posture of the lock arm body 120 is brought into a state in which the cut grass discharge restriction notch 120a is locked to the lift lever 110 against the spring force of the brake detection spring 127. Is retained. On the other hand, the posture of the restraining arm body 121 is such that the side edge 120b of the lock arm body 120 and the pressure roll 124 come into contact with each other by the spring force of the release spring 128 and the dump restraining notch 121b is locked to the dump lever 111. Is retained.

  Therefore, when the brake pedal 13 is not stepped on by the operator, any operation of the lift lever 110 and the dump lever 111 is prohibited by the lock arm body 120 and the check arm body 121. When mowing turf grass or the like, the operator removes the right foot from the brake pedal 13 and depresses the speed change pedal 12 with the right foot, so that the traveling body 1 moves, and mowing work such as turf grass is performed and cut. Mowed grass such as turf grass is collected in the grass collection box 30.

  On the other hand, as shown in FIG. 10, when the brake pedal 13 is stepped on by the operator and the rear wheel 6 is braked, the brake detection wire 119 is loosened. The posture of the lock arm body 120 is maintained in a state in which the cut grass discharge restriction notch 120a is separated from 110. In that case, the stopper body 131 contacts the upper surface of the lever guide body 118. Further, the posture of the check arm body 121 is maintained in a state where the lift lever 110 and the pressure rolls 123 and 124 come into contact with each other by the spring force of the release spring 128 and the dump check notch 121 b is separated from the dump lever 111.

  That is, in the state of FIG. 10 in which the dump check notch 121b is separated from the dump lever 111, the lift lever 110 or the dump lever 111 can be operated by the operator. At that time, the restraining arm body 121 is separated from the dump lever 111 by the spring force of the release spring 128. Therefore, when the dump lever 111 is operated by the operator to operate the dump cylinder 78, the dump lever 111 moves to a contact position with the regulating end 121c or 121d of the restraining arm body 121, and the pressure rolls 123, 124 are moved. The posture of the check arm body 121 is maintained in a state where the lift lever 110 is locked to the lift check notch 121a. Therefore, even if the lift lever 110 is to be operated, the restriction end 121c or 121d of the restraining arm body 121 comes into contact with the dump lever 111 and the movement of the restraining arm body 121 is prevented by the dump lever 111. The lift lever 110 is supported between the rolls 123 and 124, and the lift lever 110 cannot be operated. In other words, in the state of FIG. 9 where the dump lever 111 is operated (the dump cylinder 78 is operating), the operation of the lift lever 110 is prohibited by the check arm body 121.

  On the other hand, as shown in FIG. 11, when the operator operates the lift lever 110 in the upward (downward) direction and the lift cylinder 48 is activated, the pressure roll is lifted by the lift lever 110 against the release spring 128. Since 123 (pressure roll 124) is pushed, the restraining arm body 121 is supported in a state where the dump restraining notch 121b is locked to the dump lever 111. In other words, in the state of FIG. 11 where the lift lever 110 is operated (the lift cylinder 48 is operating), the operation of the dump lever 111 is prohibited by the check arm body 121. Therefore, the operator can alternatively operate either the lift lever 110 or the dump lever 111 by separating the cut grass discharge regulation notch 120a from the lift lever 110.

  Next, with reference to FIGS. 12 to 14, a mounting structure of the support leg 132 as an outrigger that prevents the traveling machine body 1 from falling is described. As shown in FIGS. 12 to 14, the outrigger support frame 133 is fixed to the lower end portion of the fixed mast 45 by welding. An intermediate portion of the leg base 135 of the support leg 132 is pivotally supported on the outrigger support frame 133 via the outrigger support shaft 134. A leg end portion 136 of the support leg 132 is connected to one end side of the leg base portion 135. The access operation portion 135a on the other end side of the leg base portion 135 is extended below the mast bottom surface 46a of the movable mast 46. When the movable mast 46 is lowered, the mast bottom surface 46a comes into contact with the access control portion 135a from the upper side.

  That is, during the mowing work in which the movable mast 46 is supported at the lowest position, the mast bottom surface 46a abuts on the entrance / exit operation portion 135a from the upper side, and the leg end portion 136 is lifted to the storage position away from the traveling road surface. Become. On the other hand, when the movable mast 46 is lifted and the grass collecting box 30 is lifted to a high place, the mast bottom surface 46a is separated from the entrance / exit operation unit 135a, and the support leg 132 is outriggered by the gravity of the leg tip 136 side. By rotating around the support shaft 134, the leg end portion 136 is landed on the traveling road surface.

  In the above-described embodiment, the leg tip 136 is landed on the traveling road surface by its own weight by raising the movable mast 46. However, the support leg 132 is placed in the direction in which the leg tip 136 lands. A spring for rotating around may be provided, and the leg end portion 136 may be pressed by the spring on the road surface.

  As shown in FIGS. 12 to 14, an outrigger lock mechanism 137 that supports the support leg 132 in the landing posture is provided. The outrigger lock mechanism 137 includes a ratchet gear 138 fitted on the outrigger support shaft 134 and a ratchet arm 140 integrally formed on one end with a ratchet claw 139 that is detachably engaged with the ratchet gear 138. The support leg 132 and the ratchet gear 138 are integrally connected. The support leg 132 and the ratchet gear 138 rotate integrally around the outrigger support shaft 134.

  A lock fulcrum shaft 141 is disposed on the fixed mast 45, and an intermediate portion of the ratchet arm 140 is rotatably fitted on the lock fulcrum shaft 141. A ratchet claw 139 is integrally formed on one end side of the ratchet arm 140. A slidable contact roller 143 is pivotally supported on the other end side of the ratchet arm 140 via a roller shaft 142. A ratchet spring 144 for locking and maintaining the ratchet pawl 139 on the ratchet gear 138 is connected between the fixed mast 45 and the ratchet arm 140.

  With the above configuration, the grass collecting box 30 is supported at the grass collecting posture position at the rear of the traveling machine body 1, and the movable mast 46 is supported at the lowest lowered position (the movable mast 46 is supported at the lowest lowered position). During the mowing operation), the mast bottom surface 46a abuts on the access operation portion 135a of the support leg 132, and the leg end portion 136 of the support leg 132 is lifted to the storage position indicated by the solid line in FIG. In that case, the ratchet arm 140 also contacts the mast bottom surface 46 a via the sliding contact roller 143, and the ratchet pawl 139 is supported at a position separated from the ratchet gear 138 against the ratchet spring 144. Therefore, the support leg 132 is held at the storage position below the grass collection box 30.

  As shown in FIG. 13, when the movable mast 46 rises from the lowest lowered position in FIG. 12, first, the mast bottom surface 46a is separated from the entrance / exit operation part 135a, and the leg tip is at the landing position shown by the solid line in FIG. The part 136 descends by its own gravity, and the leg end part 136 lands on the landing surface G (traveling road surface). Next, as the movable mast 46 further rises from the landing position of the support leg 132 of FIG. 13, the mast bottom surface 46a is separated from the sliding contact roller 143 as shown in FIG. 14, and the ratchet arm 140 of FIG. Since the ratchet spring 144 is rotated to the position indicated by the solid line, the ratchet pawl 139 is locked and maintained on the ratchet gear 138 by the ratchet spring 144. The support leg 132 is supported in a state where it has landed on the landing surface G (traveling road surface).

  That is, when the grass collection box 30 is lifted to a high place (the discharge position of the mowing grass 89 shown in FIG. 6), the support leg 132 is landed on the landing surface G due to the locking of the ratchet gear 138 and the ratchet pawl 139. Held in. Therefore, when the traveling machine body 1 is tilted in the left-right direction, the traveling machine body 1 is supported by the support legs 132 on the inclined side, so that the traveling machine body 1 can be prevented from being tilted to the falling angle, and the traveling machine body 1 can be prevented from falling. .

  On the other hand, when the grass 89 in the grass collection box 30 is discharged and the grass collection box 30 is lowered to the grass collection posture position (mowing and grass collection work position shown in FIG. 3), the ratchet pawl 139 is placed on the ratchet gear 138. When the movable mast 46 is lowered in the locked state shown in FIG. 14, first, as shown in FIG. 13, the mast bottom face 46a comes into contact with the sliding contact roller 143, and the ratchet arm 140 is shown by the solid line in FIG. The ratchet pawl 139 is disengaged from the ratchet gear 138 since the ratchet spring 144 rotates against the position indicated by.

  Next, when the movable mast 46 is further lowered from the disengagement position of the ratchet pawl 139 in FIG. 13 (the landing position of the support leg 132), the mast bottom 46a is moved in and out of the support leg 132 as shown in FIG. The support leg 132 is rotated around the outrigger support shaft 134 by the lowering of the movable mast 46 in contact with the portion 135a, and the leg end portion 136 of the support leg 132 is lifted to the storage position indicated by the solid line in FIG. Therefore, even if the traveling machine body 1 is moved and the mowing operation is performed, the support leg 132 is positioned substantially horizontally rearward in the storage position higher than the lower end of the fixed mast 45 near the bottom of the grass collection box 30. Thus, the support leg 132 can be prevented from colliding with the traveling road surface or an obstacle to be damaged.

  Next, the structure of the grass collection box 30 of this embodiment is demonstrated, referring FIG.15 and FIG.16. As shown in FIG. 15, a cylindrical opening / closing bearing body 145 is fixed to the upper surface frame 82 of the grass collecting body 76 described above. A cylindrical boss body 147 is fixed to the frame frame 146 of the lid 77 by welding. One end side of the opening / closing operation arm 84 is fixed to the boss body 147 by welding. A boss body 147 is fitted on a pin-shaped opening / closing fulcrum shaft 83 having a head 83a. A retaining pin 148 is passed through the opening / closing fulcrum shaft 83 and the boss body 147. The distal end side of the opening / closing fulcrum shaft 83 is inserted into the opening at the end of the opening / closing bearing body 145.

  That is, when the lid 77 is combined with the grass collection body 76 via the opening / closing fulcrum shaft 83, the left / right opening / closing fulcrum shaft 83 can be inserted into and removed from the left and right boss bodies 147 provided on the left and right frame frames 146 of the lid 77. Each penetrates. At the same time, the distal ends of the left and right opening / closing fulcrum shafts 83 are inserted into the openings at the left and right ends of the opening / closing bearing body 145, respectively. Next, the left and right open / close fulcrum shafts 83 are respectively engaged with the left and right boss bodies 147 by the left and right retaining pins 148, and the lid 77 is connected to the grass collection body 76 through the open / close fulcrum shaft 83 so as to be openable and closable. The operation | work which connects the cover body 77 to the grass collection main body 76 will be performed without using a tool.

  On the other hand, when removing the lid 77 from the grass collection body 76, the left and right retaining pins 148 are removed without using a tool, and the engagement between the left and right boss bodies 147 and the left and right opening / closing fulcrum shafts 83 is released. Next, without using a tool, the left and right open / close fulcrum shafts 83 are extracted from the openings at the left and right ends of the open / close bearing body 145, and the lid 77 is detached from the grass collection body 76.

  With the above configuration, as shown in FIG. 16, for example, dust 149 or cut vegetation can be collected with the lid 77 removed from the grass collection body 76. That is, by removing the lid 77 from the grass collection body 76, a large opening is formed on the rear surface side of the grass collection body 76. Dust 149 collected by an operator or cut vegetation can be put into the grass collection body 76 from the opening on the rear surface side of the grass collection body 76. On the other hand, when the inside of the grass collection body 76 is filled with dust 149 or vegetation, it moves to a dumping place such as a container 90 or a truck bed and operates the lift cylinder 48 in the same manner as described above to operate the grass collection body 76. Or by operating the dump cylinder 78 to rotate the grass collection body 76 rearward so that the dust 149 or the vegetation in the grass collection body 76 can be discharged to a dumping place such as a container 90 or a truck bed.

  Next, a control structure for automatically stopping the engine 9 in the lawn mower according to the present embodiment when the operator erroneously operates the PTO clutch lever 18 will be described with reference to FIG. As shown in FIG. 17, the above-described battery 22 for starting the engine 9 and the PTO clutch engagement sensor having an on / off switching type switch structure for detecting the PTO engagement operation (driving operation of the mower device 16) of the PTO clutch lever 18 described above. 150 and an engine stop solenoid 151 as an engine stop mechanism for stopping the supply of fuel from the fuel tank 20 to the engine 9 and stopping the engine 9. A PTO clutch engagement sensor 150 and an engine stop solenoid 151 are connected to the battery 22 in series.

  As shown in FIG. 17, an operator sensor 152 having an on / off switching type switch structure that is turned off when an operator sits on the above-described driver's seat 15 is provided. An operator sensor 152 is connected in series to the PTO clutch engagement sensor 150 and the engine stop solenoid 151. Therefore, when the operator is not seated on the driver's seat 15, the operator sensor 152 is kept on, and the PTO clutch engagement sensor 150 is turned on by the PTO engagement operation of the PTO clutch lever 18, whereby the engine stop solenoid 151 is activated. Then, the engine 9 is automatically stopped. That is, when the operator is not seated on the driver's seat 15, the operator sensor 152 is turned on and the operation of the mower device 16 is prohibited. When an operator is seated on the driver seat 15, the operator sensor 152 is turned off and the mower device 16 can be operated.

  As shown in FIG. 17, a parking lever 153 that locks and maintains the above-described brake pedal 13 at the braking position (stepping position) and a locking operation of the brake pedal 13 by the parking lever 153 (parking brake operating state) ) Is provided with a parking brake sensor 154 having an on / off switching type switch structure. A parking brake sensor 154 is connected in series to the PTO clutch engagement sensor 150 and the engine stop solenoid 151. Accordingly, the parking brake sensor 154 is turned on in a state where the brake pedal 13 is locked to the parking lever 153, and the engine 9 is automatically stopped in the same manner as described above by the PTO engagement operation of the PTO clutch lever 18. The In the parking brake operation state, the parking brake sensor 154 is turned on, and the operation of the mower device 16 can be prohibited.

  As shown in FIG. 17, when the above-described grass collection box 30 is supported at a grass collection posture position (downward position) behind the traveling machine body 1, an on / off switching type switch structure that is turned on by a lift frame 47. A grass collection box lowering sensor 155 is provided. A grass collection box lowering sensor 155 is connected in series to the PTO clutch engagement sensor 150 and the engine stop solenoid 151. Therefore, when the grass collection box 30 is not supported by the grass collection posture position behind the traveling machine body 1, in other words, when the lift lever 110 is operated, the grass collection box lowering sensor 155 is turned on, and the mower device The operation of 16 can be prohibited. When the grass collection box 30 is supported by the grass collection posture position (mowing work posture position) behind the traveling machine body 1, in other words, when the lift lever 110 is not operated, the grass collection box lowering sensor 155 is turned off. Thus, the mower device 16 can be operated.

  As shown in FIG. 17, a lift lever operation sensor 156 that is turned on when the lift lever 110 is raised or lowered is provided. A lift lever operation sensor 156 is connected in series to the PTO clutch engagement sensor 150 and the engine stop solenoid 151. Therefore, when the PTO clutch lever 18 is operated to enter the PTO, in other words, when the mower device 16 is operating, the lift lever 110 is raised or lowered, so that the engine stop solenoid 151 is activated and the engine 9 is automatically operated. Stop. That is, it is possible to prevent the grass from being scattered from the opening at the rear end of the discharge duct 29 to the outside of the grass collection box 30 due to an erroneous operation of the lift lever 110.

  On the other hand, FIG. 20 shows an embodiment in which the engine 9 is stopped by the operation of the dump lever 111 instead of the lift lever 110 of FIG. 17, and as shown in FIG. A grass collection box initial position sensor 157 having an on / off switching type switch structure that is turned on by the grass collection box 30 when supported by the grass collection posture position (the lid 77 closing position) above the lift frame 47 is provided. A grass collection box initial position sensor 157 is connected in series to the PTO clutch engagement sensor 150 and the engine stop solenoid 151. Therefore, when the grass collection box 30 is not supported at the grass collection posture position behind the traveling machine body 1, in other words, when the dump lever 111 is operated, the grass collection box initial position sensor 157 is turned on, and the mower The operation of the device 16 can be prohibited. When the grass collection box 30 is supported by the grass collection posture position (mowing work posture position) above the lift frame 47, in other words, when the dump lever 111 is not operated, the grass collection box initial position sensor 157 is The mower device 16 can be activated.

  Further, as shown in FIG. 20, a dump lever operation sensor 158 that is turned on by the opening or closing operation of the dump lever 111 described above is provided. A dump lever operation sensor 158 is connected in series to the PTO clutch engagement sensor 150 and the engine stop solenoid 151. Therefore, when the PTO clutch lever 18 is operated to enter the PTO, in other words, when the dump lever 111 is opened or closed while the mower device 16 is operating, the engine stop solenoid 151 is operated and the engine 9 is operated. Stop automatically. That is, when the dump lever 111 is erroneously operated while the mower device 16 is operating, the engine 9 is automatically stopped, and the cut grass is diffused from the opening at the rear end of the discharge duct 29 to the outside of the grass collection box 30. Can be prevented.

  Next, weed collection work control (mowing grass discharge control, engine stop control) of the work vehicle (lawn mower) of this embodiment will be described. FIG. 18 is a functional block diagram of the grass collection work control means. A controller 160 for grass collection work control such as a microcomputer having a ROM storing a control program and a RAM storing various data is used for applying power. The battery 22 is connected via a key switch or the like.

  As shown in FIG. 18, the controller 160 includes various sensors and switches of the input system, that is, a limit switch type brake sensor 161 that is turned on when the operator depresses the brake pedal 13, and a lift cylinder 48. A lift switch 162 that moves up or down, a dump switch 163 that opens or closes the dump cylinder 78, and an on / off switch type switch structure that detects the PTO engagement operation (drive operation of the mower device 16) of the PTO clutch lever 18 described above. The PTO sensor 164, the seat sensor 165 having an on / off switching type switch structure that is turned off when an operator sits on the driver seat 15 described above, and the locking operation of the brake pedal 13 by the parking lever 153 (parking brake operating state) Activated by A parking sensor 166 having an on / off switching type switch structure, and a grass collection sensor 167 having an on / off switching type switch structure that is turned on when the grass collection box 30 described above is supported at a grass collection posture position behind the traveling machine body 1; Is connected.

  Further, as shown in FIG. 18, the controller 160 includes various output solenoids, that is, an ascending solenoid 107a and a descending solenoid 107b of an electromagnetic switching lift valve 107 for raising or lowering the lift cylinder 48. Then, the opening solenoid 109a and the closing solenoid 109b of the electromagnetic switching type dump valve 109 for opening or closing the dump cylinder 78 and the supply of fuel from the fuel tank 20 to the engine 9 are stopped, and the engine 9 is stopped. An engine stop solenoid 151 is connected as an engine stop mechanism for stopping the engine.

  Next, control for discharging the cut grass in the grass collection box 30 and stop control for the engine 9 will be described with reference to a flowchart shown in FIG. During mowing work such as turf grass of this embodiment, the operator determines whether or not the grass cutting box is full in the grass collection box 30. If the grass cutting 89 is full in the grass collection box 30, the container 90 or the truck The traveling machine body 1 is moved to the discharge location of the mowing grass 89 where there is a loading platform. When discharging the grass 89 to the container 90 or the like, first, based on the detection result of the brake sensor 161, it is determined whether or not the operator has stepped on the brake pedal 13 (S1). When the operator depresses the brake pedal 13 (S1: yes), the lift cylinder 48 is lifted (S3) when the operator raises the lift switch 162 (S2: yes). Further, when the operator opens the dump switch 163 (S4: yes), the dump cylinder 78 is opened (S5). That is, the lifting operation of the lift switch 162 lifts the grass collection box 30 in the grass collection posture position at the rear of the traveling machine body 1 to a position higher than the upper surface opening of the container 90. Further, the opening operation of the dump switch 163 causes the lid 77 to move rearward and upward while the grass collecting body 76 rolls backward. Therefore, the grass collection box 30 is opened, and the cut grass 89 inside is discharged to the approximate center of the upper surface opening of the container 90.

  The operator determines whether or not the cut grass 89 has been discharged from the grass collection box 30, and when the cut grass 89 is discharged and the grass collection box 30 becomes empty, the operator closes the dump switch 163 (S6). : Yes), the dump cylinder 78 moves to close (S7). Further, when the operator lowers the lift switch 162 (S8: yes), the lift cylinder 48 is lowered (S9). That is, when the grass 89 in the grass collection box 30 is discharged to the approximate center of the upper opening of the container 90, the lid 77 moves forward and downward while the grass collection body 76 rolls forward by the closing operation of the dump switch 163. And the grass collection box 30 is closed. Further, the lowering operation of the lift switch 162 lowers the grass collection box 30 at a position higher than the upper surface opening of the container 90 to the grass collection posture position at the rear of the traveling machine body 1. Therefore, when the mower device 16 is driven and the mowing operation is resumed, the mowing grass 89 is carried from the mower device 16 into the grass collection box 30 and the grass cutting 89 is collected in the grass collection box 30.

  Therefore, only when the operator depresses the brake pedal 13, the lift cylinder 48 is operated by the operation of the lift switch 162, and the dump cylinder 78 is operated by the operation of the dump switch 163. Further, when one of the lift cylinder 48 and the dump cylinder 78 is operating, the other operation is prohibited. For example, even if both the lift switch 162 and the dump switch 163 are operated substantially simultaneously by the operator, or the other is operated while operating one of the lift switch 162 and the dump switch 163, the lift switch 162 that has been operated first is operated. The lift cylinder 48 (dump cylinder 78) is operated based on the operation of the (dump switch 163). That is, the dump cylinder 78 does not operate while the lift cylinder 48 is operating. Further, the lift cylinder 48 does not operate while the dump cylinder 78 is operating.

  On the other hand, in step 1 described above, when the brake pedal 13 is not stepped on by the operator (S1: no), the operator is not seated on the driver's seat 15 (the seat sensor 165 is off) (S10: no). Alternatively, the brake pedal 13 is locked at the brake operating position by the parking lever 153 (parking brake) (S11: yes), or the grass collection box 30 is supported at the grass collection posture position behind the traveling machine body 1. In any state (S12: no), when the operator operates the PTO clutch lever 18 to enter the PTO (S13: yes), the engine stop solenoid 151 is activated and the engine 9 is forcibly stopped (S14).

  That is, when the operator is not seated on the driver's seat 15 or when the parking brake is applied (the rear wheel 6 is in a braking state), the grass collection box 30 is located at a position other than the grass collection posture position behind the traveling machine body 1. When supported, the operation of the mower device 16 is prohibited.

  The controller 160 described above is connected to a brake mechanism 168 such as an electric brake motor or a hydraulic brake cylinder that brakes the rear wheel 6 (front wheel 5) and an electromagnetic brake valve. When the lift cylinder 48 is operated by operating the lift lever 110 or the lift switch 162 described above, the brake mechanism 168 is also operated at the same time. Therefore, the rear wheel 6 (front wheel 5) is automatically braked by operating the lift lever 110 or the lift switch 162. That is, when the lifting cylinder 48 is operated to move the grass collection box 30 up and down, even if the operator's foot leaves the brake pedal 13 or forgets to step on the brake pedal 13, the traveling vehicle body 1 moves by braking the rear wheel 6. Therefore, the mowing grass 89 in the grass collection box 30 can be discharged to the container 90 or the like while the traveling machine body 1 is fixed at a substantially constant place.

  As is clear from the above description and FIGS. 1, 17, 18, and 19, the mower device 16 mounted on the traveling machine body 1 and the collection as a grass collecting body for collecting the grass 89 cut by the mower device 16 are collected. A grass box 30 and a lift mechanism 31 that supports the grass collection box 30 to be movable up and down are provided on the traveling machine body 1, and the grass collection box 30 is lifted by the lift mechanism 31 to discharge the cut grass in the grass collection box 30. On the other hand, a lawn mower comprising an engine stop solenoid 151 as an engine stop mechanism for stopping the engine 9 mounted on the traveling machine body 1 and a PTO clutch lever 18 as a PTO operation body for driving or stopping the mower device 16. , A PTO clutch as a PTO entering detection means for detecting an operation of the PTO clutch lever 18 for driving the mower device 16 Sensor 150 or PTO sensor 164 and parking brake sensor 154 as a parking brake detection means for detecting the operation of the parking lever 153 as a parking brake for maintaining the rear wheel 6 as a traveling part of the traveling machine body 1 in a braking state. Alternatively, since the parking sensor 166 is provided so that the engine stop solenoid 151 is operated by driving the mower device 16 of the PTO clutch lever 18 while the parking lever 153 is engaged and operated, the PTO clutch lever 18 is erroneously operated. Thus, the engine 9 can be stopped, and it is possible to easily prevent the mower device 16 from being inappropriately driven by an operator's erroneous operation or the like, thereby improving the operator's driving operability or mowing work operability.

  As is clear from the above description and FIGS. 17, 18, and 19, an operator sensor 152 or a seat sensor 165 is provided as seating detection means for detecting that an operator has sat on the driver's seat 15 of the traveling machine body 1. Since the engine stop solenoid 151 is operated by at least one of the case where the parking lever 153 is entered and activated while the mower device 16 is being driven or the operator leaves the driver's seat 15, The engine 9 can be stopped by an erroneous operation of the parking lever 153, and the mower device 16 can be easily prevented from being inappropriately driven by an operator's erroneous operation or the like, and the operator's driving operability or mowing work operability can be improved.

  As is clear from the above description and FIGS. 17, 18, and 19, the grass collection box lowering sensor 155 as the grass collection detection means 155 or the grass collection box detecting means for detecting the grass collection box 30 supported at the grass collection position of the traveling machine body 1. A grass sensor 167 is provided, and the engine stop solenoid 151 is activated by driving the mower device 16 of the PTO clutch lever 18 in a state where the grass collection box 30 is supported at a position other than the grass collection position of the traveling machine 1. Therefore, the engine 9 can be stopped by an erroneous operation of the PTO clutch lever 18, and the mower device 16 can be easily prevented from being improperly driven by an erroneous operation of the operator. Operability can be improved.

  As is clear from the above description and FIGS. 17, 18, and 19, the lift lever 110 or the lift switch 162 as a lift operating body that moves the grass collection box 30 up and down, and the lift lever 110 or the lift switch 162 ascending operation. Or a lift lever operation sensor 156 or a controller 160 as a lift detection means for detecting at least one or both of the lowering operations, and when the mower device 16 is being driven, the lift lever 110 or the lift switch 162 is raised or lowered. Therefore, the engine 9 can be stopped by an erroneous operation of the lift lever 110 or the lift switch 162, and the mower device 16 is improperly driven by an erroneous operation of the operator or the like. Can be easily prevented Thereby improving driving operation or mowing operation of the operator.

It is the whole lawn mower side view. It is the same top view. It is a side view which shows the rear part and traveling body of a traveling body. It is a rear view which shows a lift mechanism. It is the elements on larger scale of the lift mechanism of FIG. It is a side view which shows discharge of the cut grass of a grass collection body. It is a hydraulic circuit diagram. It is a side view of the attachment part of a lift lever and a dump lever. It is a front view of the attachment part of a lift lever and a dump lever. It is operation | movement explanatory drawing of a dump lever. It is operation | movement explanatory drawing of a lift lever. It is a side view of the attaching part of a support leg. It is a side view which shows the state which the support leg body landed. It is a side view which shows the state which locked the support leg body to the landing position. It is a partial expanded explanatory view of a grass collection box. It is the whole side view which shows another example of use. It is a control circuit diagram which stops an engine. It is a functional block diagram of a grass collection work control means. It is a flowchart of grass collection work control. FIG. 18 is a control circuit diagram showing another embodiment of FIG. 17.

Explanation of symbols

1 traveling body 6 rear wheel (traveling part)
9 Engine 15 Driver's seat 16 Mower device 18 PTO clutch lever (PTO operation body)
30 Grass collection box (grass body)
31 Lift mechanism 89 Cut grass 150 PTO clutch sensor (PTO entering detection means)
151 Engine stop solenoid (engine stop mechanism)
152 Operator sensor (seating detection means)
153 Parking lever (parking brake)
154 Parking brake sensor (parking brake detection means)
155 Grass collection box descent sensor (collection detection means)
156 Lift lever operation sensor (lift detection means)
160 Controller (lift detection means)
164 PTO sensor (detection means with PTO)
165 Seat sensor (seating detection means)
166 Parking sensor (parking brake detection means)
167 Grass collection sensor (collection detection means)

Claims (4)

A mower device mounted on the traveling machine body, a grass collecting body for collecting grass cut by the mower apparatus, and a lift mechanism for supporting the grass collecting body so as to be movable up and down on the traveling machine body. An engine stop mechanism for stopping the engine mounted on the traveling machine body and a PTO operation body for driving or stopping the mower device, while configured to lift the grass body and discharge the cut grass in the grass collection body. In the lawn mower
PTO entering detection means for detecting an operation of the PTO operating body for driving the mower device, and parking brake detecting means for detecting a parking brake entering operation for maintaining the traveling portion of the traveling machine body in a braking state; With
A lawnmower configured to operate the engine stop mechanism by driving the mower device of the PTO operating body while the parking brake is applied.   When seating detection means for detecting that an operator has sat on the driving seat of the traveling machine body is provided, and when the mower device is being driven, the parking brake is applied and operated, or when the operator leaves the driving seat The lawn mower according to claim 1, wherein the engine stop mechanism is operated by at least one of the two.   A grass collection detection means for detecting the grass collection body supported at the grass collection position of the traveling machine body, and in a state where the grass collection body is supported at a position other than the grass collection position of the traveling machine body, The lawn mower according to claim 1, wherein the mower device driving operation activates the engine stop mechanism.   A lift operating body for raising and lowering the grass collection body; and lift detecting means for detecting at least one or both of an ascending operation and a descending operation of the lift operating body, and driving the mower device. The lawn mower according to claim 1, wherein the engine stop mechanism is activated by an ascending operation or a descending operation.

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