JP3859599B2 - Mower brake operation structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a braking operation structure for a mower having a traveling machine body including a pair of continuously variable transmissions for independently shifting left and right drive wheels corresponding to the shift levers based on operations of the left and right shift levers. .
[0002]
[Prior art]
  Conventionally, as the above-described braking operation structure of a mower, a brake pedal and a brake lever are provided, and any of these operations can show a braking state according to the operation amount, and The brake lever can be held at the braking position so that the parking state can be maintained, and the brake pedal can be operated according to the amount of operation. In addition, there is a configuration in which a parking state in which the brake pedal is maintained in the braking position and the braking state is maintained by operating the brake lever in the braking state (see, for example, Patent Document 1). .)
[0003]
[Patent Document 1]
    JP 2001-63536 A (paragraph numbers 0037-0039 and 0042, FIGS. 1-3, 10, 11, and 14-16)
[0004]
[Problems to be solved by the invention]
  Among the prior arts described above, in the former prior art in which both the brake pedal and the brake lever are used as an operating tool for braking and the brake lever is also used as an operating tool for parking, the brake pedal Since the brake lever must be linked to the brake mechanism so that the braking state can be revealed by any of these operations, the linkage structure for enabling the operation of the brake mechanism becomes complicated.
[0005]
  Further, in the latter conventional technique configured to use the brake pedal as a braking operation tool and the brake lever as a parking operation tool, the brake pedals are arranged at positions where the operation is easy. The brake pedal (arranged at the foot position) and the brake lever (arranged laterally of the driver's seat) are separated from each other so that the brake pedal can be held at the braking position. Becomes complicated. Further, if the brake lever is disposed at the foot position near the brake pedal in order to simplify the linkage structure, it becomes difficult to operate the brake lever during parking.
[0006]
  Furthermore, in any of the above prior arts, since the brake lever is used as an operating tool for parking, when parking the aircraft, the left and right shift levers are operated to the neutral position with both hands, and one foot is used. Operate the brake pedal (in the former conventional technology, the brake lever can be operated with one hand) to stop braking the aircraft, and then operate the brake lever with one hand to brake the brake pedal (the brake lever in the former conventional technology). In order to re-run the aircraft, the brake lever is operated with one hand to release the brake pedal (the brake lever in the former prior art) in the braking position, Operate the brake pedal with one foot (in the former conventional technology, you can also operate the brake lever with one hand) to release the braking stop of the aircraft After that, in both cases, it takes time and effort to switch between the shift lever and the brake lever during a series of operations, such as operating the left and right shift levers from the neutral position to the desired travel position with both hands. In addition, depending on the positional relationship between the shift lever and the brake lever, there is a possibility of causing an erroneous operation due to an unexpected contact or the like when changing the grip.
[0007]
  By the way, in order to avoid complication of the linkage structure, it may be configured to show the braking state and the parking state only by operating the brake lever, but according to this configuration, only when the aircraft is parked In addition, when braking the airframe, since it is necessary to switch from the shift lever to the brake lever, it is difficult to deal with dredging when an emergency braking operation is required during traveling.
[0008]
  An object of the present invention is to provide a braking operation structure for a mower that can improve operability while simplifying the linkage structure.
[0009]
[Means for Solving the Problems]
〔Constitution〕
  In order to achieve the above object, in the present invention, the traveling machine body includes a pair of continuously variable transmissions that independently shift the left and right drive wheels corresponding to the shift levers based on the operation of the left and right shift levers. A brake pedal and a lock pedal that enables the brake pedal to be held at the braking position at the front left and right center of the boarding step in the traveling body.The brake pedal operation part and the lock pedal operation part are arranged side by side in the vicinity of the left and right sides, and the swing fulcrum of the brake pedal is arranged behind and below the operation part of the brake pedal. By setting the dynamic fulcrum forward and downward from the operation part of the lock pedal, the depression direction of the operation part of the brake pedal and the depression direction of the operation part of the lock pedal are set differently.It is.
[0010]
[Action]
  According to the present invention, when braking the aircraft, it is only necessary to operate the brake pedal with one foot while holding the left and right shift levers with both hands, and when parking the aircraft with both hands While holding the speed change lever, operate the brake pedal with one foot to stop braking the aircraft, then operate the lock pedal with the other foot to hold the brake pedal in the braking position. When re-running the vehicle, operate the brake pedal or lock pedal with one foot to release the brake pedal from the braking position, and operate the brake pedal with the other foot or the other foot to brake the aircraft. After releasing the stop, the left and right speed change levers may be operated from the neutral position to the desired travel position with both hands.
[0011]
  In other words, when the aircraft is braked, the aircraft is parked, or the aircraft is re-traveled, the lever is changed as in the case where the aircraft is braked or parked by lever operation. Because it is not necessary, it becomes easier to handle dredging when urgent braking operation is required, and the aircraft can be parked and re-run quickly by a series of operations that do not require lever repositioning. At the same time, it is possible to avoid an erroneous operation caused by an unexpected contact when the lever is changed.
[0012]
  In addition, since the vehicle body can be braked only by operating the brake pedal, it is possible to avoid the complication of the linkage structure that occurs when the vehicle body is braked by an operation tool other than the brake pedal. .
[0013]
  Furthermore, since the brake pedal and the lock pedal are arranged side by side on the left and right sides, the linkage structure for enabling the lock pedal to hold the brake pedal in the braking position can be simplified. Further, since the lock pedal is operated with the foot, the operability is not deteriorated by the juxtaposition with the brake pedal arranged at the foot position.
[0014]
  Moreover, the brake pedal is located at the center of the front left and right of the boarding step.Operation sectionAnd lock pedalOperation sectionAnd left and rightPlace side by sideBrake pedal with one foot fromOperation sectionOperate the lock pedal with the other footOperation sectionBrake pedal at the front left and right side of the boarding step when parkingOperation sectionAnd lock pedalOperation sectionAnd left and rightPlace side by sideA boarding step where the upper body is not forced to be twisted to the pedal side relative to the upper body, and the feet are naturally positioned when maneuvering, and the step when stepping on and off A wide footrest area can be secured at both the left and right side portions.
[0015]
〔effect〕
  Accordingly, it is possible to provide a braking operation structure for a mower capable of improving the operability while simplifying the linkage structure, and to improve the comfort and the ease of getting on and off.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  FIG. 1 shows the entire side surface of the riding-type grass mower, and FIG. 2 shows the entire plane of the riding-type grass mower. The riding-type grass mower has a longitudinal axis around the front of the traveling machine body 1. The mower 4 can be moved up and down between a pair of left and right caster-type front wheels 2 that can be freely steered and a pair of left and right rear wheels 3 that are arranged as drive wheels at the rear of the traveling body 1. It is configured in a mid-mount format.
[0017]
  As shown in FIGS. 1 to 3, the traveling machine body 1 has a boarding operation unit 5 formed on the front side thereof, a driving unit 6 provided on the rear side thereof, and the boarding operation unit 5 is arranged on the front part of the body frame 7. Boarding step 8 laid on the side, driver's seat 9 arranged on the rear side of the fuselage frame 7, shift lever 10 equipped so as to be swingable to the left and right of the driver's seat 9, and the rear part of the driver's seat 9 on the fuselage frame 7 It is formed from a fall protection frame 11 erected on the top.
[0018]
  The driving unit 6 includes an air-cooled engine 13 mounted on an engine frame 12 located behind the body frame 7, a transmission device 14 disposed in front of the lower portion of the engine 13, and a pair of hydrostatic pressures provided to be distributed to the left and right of the transmission device 14. Power from the engine 13 is transmitted from a hydraulic continuously variable transmission (an example of a continuously variable transmission) 15 and a corresponding left and right speed reducer 16 extending from the corresponding hydrostatic continuously variable transmission 15 to the left and right rear wheels 3. The power is transmitted to the device 14, and the power is distributed to the left and right traveling and working in the transmission 14, and the left and right traveling power from the transmission 14 is transmitted by the corresponding hydrostatic continuously variable transmission 15. After shifting, the transmission power is transmitted to the corresponding left and right rear wheels 3 via the left and right reduction gears 16, and the working power from the transmission device 14 is transmitted to the transmission section 18 of the mower 4 via the transmission shaft 17. It is configured to.
[0019]
  Further, in the driving section 6, the left and right speed reducers 16 are also used as a relay frame that connects the body frame 7 and the engine frame 12, and the transmission device 14 and the pair of hydrostatic continuously variable transmissions 15 are used as the relay frame. It is also used as an intermediate frame that connects the left and right reduction gears 16 that are also used.
[0020]
  In the traveling machine body 1, the left and right speed change levers 10 are linked to corresponding hydrostatic continuously variable transmissions 15, and when each of the left and right speed change levers 10 is operated, the corresponding hydrostatic continuously variable speed change is performed. The device 15 is operated for independent shifting, and the motive power after each shifting is transmitted to the corresponding left and right rear wheels 3.
[0021]
  That is, the traveling machine body 1 operates the left and right speed change levers 10 to operate the pair of hydrostatic continuously variable transmissions 15 independently, thereby stopping the transmission to the left and right rear wheels 3, A straight traveling state in which constant speed forward power or reverse power is transmitted to the rear wheel 3,DifferentA slow turning state that transmits forward power or reverse power, the left and right rear wheels 3eitherA pivoting state in which transmission to one side is stopped and forward power or reverse power is transmitted to the other, forward power is transmitted to one of the left and right rear wheels 3, and reverse power is transmitted to the other It is now possible to show the spin rotation state.
[0022]
  The mower 4 is provided in a housing 20 that is suspended and supported by the machine body frame 7 via a link mechanism 19, and the working power transmitted to the upper transmission portion 18 is moved around a longitudinal axis. The three blades 21 for mowing that are driven to rotate at high speed are rotated such that a part of their rotation trajectories overlaps, and the left blade 21 faces backward and the right blade 21 faces forward in each overlapping portion. In a state where the direction is set, the blades 21 are arranged side by side in the left-right direction. By rotating these blades 21, the grass is cut and the conveying wind generated by these rotational drives is generated. Thus, the cut grass is discharged from the discharge port formed in the right side portion of the housing 20.
[0023]
  As shown in FIGS. 1 to 7, a single unit linked via a linkage mechanism 23 to a braking mechanism 22 built in each of the left and right reduction gears 16 is provided at the front left and right center of the boarding step 8 in the traveling body 1. The brake pedal 24 and the lock pedal 25 that enables the brake pedal 24 to be held at the braking position are adjacent to the left and right with the brake pedal 24 positioned on the right side and the lock pedal 25 positioned on the left side. Side by side.
[0024]
  The linkage mechanism 23 corresponds to a brake mechanism corresponding to a left-right support shaft 26 supported on the body frame 7 so as to be rotatable about a left-right axis, and a linkage arm 27 fixed to both left and right ends of the support shaft 26. The axis 26 of the support shaft 26 is constituted by left and right operation rods 29 laid over 22 operation arms 28 and coil springs 30 fitted to the rear of each operation rod 29.(Oscillation fulcrum)The left and right braking mechanisms 22 are braked so that a braking state corresponding to the amount of stepping operation is obtained in conjunction with the stepping operation from the non-braking position of the brake pedal 24 with fulcrum as a fulcrum. .
[0025]
  The brake pedal 24 includes a base end portion 31 extending from the support shaft 26 of the linkage mechanism 23 and an operation portion 32 extending from the base end portion 31, and the lock pedal 25 extends from the base end portion 31. It is urged to return to the non-braking position by a coil spring 33 installed over the entire area.
[0026]
  The lock pedal 25 is provided with an operation portion 34 at the upper end portion, and an engagement portion 36 that can be engaged with an engaged portion 35 formed at the base end portion 31 of the brake pedal 24 is formed at the lower end portion. In this state, the center of the frame 38 is mounted on the bracket 38 mounted on the left-right front frame 37 via the left-right support shaft 39.(Oscillation fulcrum)Normally, the balance is swingably supported. Normally, the above-described coil spring 33 causes the engaging portion 36 to be separated from the engaged portion 35 of the brake pedal 24, and the lower end thereof is attached to the front frame 37. Only when it is urged to return to the contacted non-locking position, and the operation from the non-locking position to the locking position is prevented by the engaged portion 35 of the brake pedal 24 and the brake pedal 24 is depressed to the lower limit position. The operation from the unlocked position to the locked position is allowed.
[0027]
  Then, if the brake pedal 24 is depressed to the lower limit position, and the lock pedal 25 that is permitted to move from the unlocked position to the locked position is operated to the locked position, the depression operation of the brake pedal 24 is released. The engaging portion 36 of the lock pedal 25 is engaged with the engaged portion 35 of the brake pedal 24, and the engaged state is maintained by the biasing of the coil spring 33 described above. Reference numeral 24 denotes a brake position, and the lock pedal 25 is held at the lock position.
[0028]
  Further, when the brake pedal 24 is depressed while the brake pedal 24 is held at the braking position and the lock pedal 25 is held at the locked position, the engaged portion 35 of the brake pedal 24 is moved from the engaging portion 36 of the lock pedal 25. The holding of the brake pedal 24 and the lock pedal 25 due to their engagement is released, and the lock pedal 25 swings back from the locked position to the unlocked position by the bias of the coil spring 33, and the brake pedal 24 As the pedal is released, the brake pedal 24 returns to the non-braking position by the bias of the coil spring 33 and swings.
[0029]
  From the above configuration, when braking the traveling machine body 1, the brake pedal 24 is depressed with the right foot while the left and right speed change levers 10 are held with both hands, and the braking state corresponding to the depression operation amount is achieved. In the case where the traveling vehicle body 1 is parked, the brake pedal 24 is depressed to the braking position with the right foot while holding the left and right speed change levers 10 with both hands. After the brake is stopped, the lock pedal 25 is operated from the unlocked position to the locked position with the left foot, and the operation of depressing the brake pedal 24 is released in this state, so that the parking state in which the brake pedal 24 is held at the braking position is achieved. In addition, when the traveling vehicle 1 is driven from the parked state, the brake pedal 24 is depressed with the right foot to operate the brake pedal 24. After releasing the holding at the moving position and releasing the depression of the brake pedal 24 by the right foot to release the braking stop of the traveling vehicle body 1, the left and right speed change levers 10 are moved from the neutral position to the desired traveling position with both hands. By operating, the traveling state according to the operation position of the left and right speed change levers 10 can be revealed.
[0030]
  In other words, in either case of revealing the braking state, revealing the parking state, or revealing the traveling state from the parking state, the braking state of the traveling machine body 1 or the appearance of the parking state can be controlled by lever operation. Since it is not necessary to change the lever as in the case where it is configured to do so, it becomes easier to deal with dredging when an emergency braking operation is required, and the parking state of the traveling machine body 1 and the traveling The state can be quickly displayed by a series of operations that do not require the lever to be changed without causing an erroneous operation caused by an unexpected contact when changing the lever.
[0031]
  Further, since the brake pedal 24 and the lock pedal 25 are arranged side by side on the left and right sides, the linkage structure for enabling the lock pedal 25 to be held at the braking position can be simplified. Since the brake pedal 24 and the lock pedal 25 are juxtaposed side by side at the center of the front left and right of the boarding step 8, the brake pedal 24 is operated with the right foot and the lock pedal 25 is operated with the left foot. When exiting, for example, an unreasonable posture in which the lower body is twisted to the pedal side with respect to the upper body as in the case where the brake pedal 24 and the lock pedal 25 are juxtaposed on the left and right sides of the front part of the boarding step 8 The left and right sides of boarding step 8 are both footrests that are naturally positioned when maneuvering and are used as steps when getting on and off. It has thus can secure a wide footrest area at the location 40.
[0032]
  As shown in FIGS. 3 to 11, the front frame 37 is formed in a U-shaped cross-section that opens the bottom, and the front wheel 2 is freely steerable around the longitudinal axis at the left and right ends. A boss 41 is provided for support.
[0033]
  Further, the front frame 37 swings between a retracted posture along the front frame 37 and a vertically acting posture around the axial center of the front and rear support shaft 42 provided at the left and right intermediate portions thereof. A jack 43 is provided which is stored in the front frame 37 in a state where the movement is switchable and is switched to the retracted posture, and which can be expanded and contracted in the state where it is switched to the working posture.
[0034]
  The jack 43 includes a swing leg 44 that swings around the axis of the support shaft 42, a slide leg 45 that is slidably guided by the swing leg 44, a drive unit 46 that slides the slide leg 45, and a drive The operation unit 47 is detachably connected to the unit 46, and the like.
[0035]
  The swing leg 44 is formed in a state in which a square pipe-shaped leg member 49 extends from a swing fulcrum member 48 fitted on the support shaft 42 toward one side. The jack 43 is positioned in the retracted position by engaging with the first locking hole 50 formed in the frame 37, and the jack 43 is positioned in the operating position by engaging with the second locking hole 51 formed in the front frame 37. The locking pin 52 is engaged and urged by the coil spring 53, and the operation arm 54 provided at the rear part thereof is engaged and released in the engagement release direction against the urging of the coil spring 53. Further, the spring receiving pin 55 attached to the intermediate portion is engaged with the recess 56 formed in the swing fulcrum member 48, so that the movement in the engagement releasing direction is prevented. ing.
[0036]
  The sliding leg 45 is equipped with a female screw portion 58 fixed to one end of a square pipe 57 that is slidably fitted to the leg member 49 of the swinging leg 44 and is relatively non-rotatable, and a support shaft 59 at the other end. It is comprised by connecting the grounding member 60 so that back-and-forth swinging is possible.
[0037]
  The drive unit 46 includes a support shaft 42 and a swing leg 44 that is externally fitted to the other end portion of the feed shaft 62 in which a male screw portion 61 that is screwed into the female screw portion 58 of the sliding leg 45 is formed on one end side. The swinging fulcrum member 48 is penetrated from the direction perpendicular to the axis of the support shaft 42, and the other end is prevented from coming off from the support shaft 42 and the swinging fulcrum member 48. By mounting the retaining member 65 formed with the portion 63 and the fitted portion 64 having a quadrangular cross section, the support shaft 42 and the swing fulcrum member 48 can be relatively rotated around the axis of the feed shaft 62. It is supported by.
[0038]
  The operation portion 47 has an operation rod 67 extending in a direction perpendicular to the axial center of the square pipe 66 from the other end portion of the square pipe 66 that is detachably fitted to the fitted portion 64 of the drive portion 46 at one end. In the state where it is configured and removed from the drive unit 46, the corner pipe 66 can be inserted into the pair of front and rear locking holes 68 in a square shape formed in the front frame 37. The pipe 66 receives and supports the free end portion of the jack 43 switched to the retracted position in a state where the grounding member 60 of the sliding leg 45 is in contact with the upper inner surface of the front frame 37, and the operation rod 67 is The front frame 37 can be brought close to the lower end of the front frame 37.
[0039]
  A thrust bearing 69 is interposed between the swing fulcrum member 48 of the swing leg 44 and the feed shaft 62 of the drive unit 46, and the square pipe 66 of the operation unit 47 is engaged with the front frame 37. A beta pin 70 for preventing the stopper 68 from coming off is detachably mounted. Further, the boarding step 8 and the front frame 37 are formed with openings 71 and 72 that allow the operation unit 47 to be attached to the drive unit 46 in a state where the jack 43 is switched from the retracted position to the operating position.
[0040]
  With the above configuration, when performing maintenance such as cleaning the inside of the mower 4 or replacing the blade 21, the operation portion of the jack 43 is firstly moved from the locking hole 68 of the front frame 37 at the dismounting position in front of the traveling machine body. 47, and then the locking pin 52 of the jack 43 is pulled out from the first locking hole 50 of the front frame 37 to switch the jack 43 from the retracted position to the operating position, and the locking pin 52 is moved to the front frame. 37, the operation portion 47 is externally fitted to the driving portion 46 through the boarding step 8 and the openings 71 and 72 of the front frame 37. If the 47 is rotated around the axis of the drive unit 46 and the slide leg 45 is slid downward by the screw feed operation of the drive unit 46, the jack 43 is extended and the traveling machine body is extended. The front side of the rear wheel 3 is lifted with the axle 73 of the rear wheel 3 as a fulcrum, and accordingly, the mower 4 is in a front-up posture with the inside facing forward, Maintenance can be easily performed without the need to remove the mower 4 from the traveling machine body 1.
[0041]
  After the maintenance is completed, the operation unit 47 is rotated around the axis of the drive unit 46, and the slide leg 45 is slid upward by the screw feed operation of the drive unit 46. For example, the jack 43 contracts and the lifting of the front side of the traveling machine body with the axle 73 of the rear wheel 3 as a fulcrum is released. After the lifting is released, the operation unit 47 is removed from the driving unit 46 and the locking pin 52 is extracted from the second locking hole 51 of the front frame 37, the jack 43 is switched from the operating posture to the retracted posture, and the locking pin 52 is engaged with the first locking hole 50 of the front frame 37. Positioning in the retracted position, and then inserting the operating portion 47 into the locking hole 68 of the front frame 37 and preventing it from coming off with the beta pin 70, the jack 43 can be held in the retracted position in a stable state without rattling. The operation unit 47 has been removed from the drive unit 46, unobtrusive, and, on that can be stored in a position inconspicuous without reducing the appearance, it becomes possible to avoid the loss of the operation unit 47.
[0042]
  Since the jack 43 is stored in the front frame 37 in the retracted position of the jack 43, it is possible to avoid deterioration of the appearance due to the jack 43 being exposed to the outside in a normal state where the jack 43 is switched to the stored position. At the same time, there is no inconvenience that the jack 43 switched to the retracted position enters the lifting area of the mower 4 and hinders the lifting operation of the mower 4.
[0043]
  In addition, since the support shaft 42 that serves as a swing fulcrum of the jack 43 is disposed in the left and right intermediate portion of the front frame 37, the jack 43 stands vertically in the left and right intermediate portion of the front frame 37 in its operating posture. In addition, the telescopic operation in the standing state causes the front side of the traveling machine body 1 to be lifted and lowered with the axle 73 of the rear wheel 3 as a fulcrum. Since the support shaft 59 connecting the grounding member 60 allows tilting displacement in the front-rear direction, the front side of the traveling machine body 1 can be easily and quickly moved up and down in a stable state with good left-right balance and little displacement of the machine body center of gravity. To be able to.
[0044]
  As shown in FIGS. 2 and 4 to 8, an anti-slip rubber mat 74 is laid on the upper surface of the boarding step 8, and the rubber mat 74 covers the boarding step 8 and the openings 71 and 72 of the front frame 37. The tongue 75 that can be lifted up from the state is provided, so that the boarding step 8 and the openings 71 and 72 of the front frame 37 can be hidden by the tongue 75 when the jack 43 is not used. Therefore, it is possible to avoid deterioration of the appearance due to the exposure of the openings 71 and 72. Further, when the jack 43 is used, the boarding step 8 and the front portion are simply raised by raising the tongue 75. The openings 71 and 72 of the frame 37 can be opened so that the operation unit 47 can be quickly attached to the drive unit 46 from the openings 71 and 72. You have me.
[0045]
  As shown in FIGS. 5, 7, and 8, when the brake pedal 24 is positioned at the non-braking position in a state where the operation portion 47 is attached to the drive portion 46 of the jack 43 switched to the action posture, the brake pedal 24 interferes with the operation rod 67 of the operation unit 47, and the brake pedal 24 is configured not to interfere with the operation rod 67 of the operation unit 47 when the brake pedal 24 is located at the braking position.
[0046]
  In other words, the operation unit 47 of the jack 43 can be rotated only when a parking state in which the brake pedal 24 is held at the braking position by the lock pedal 25 appears. Thus, the vehicle body can be lifted, so that it is possible to prevent an unexpected displacement of the vehicle body caused by forgetting to apply the brake when the jack 43 lifts the front side of the traveling vehicle body 1.
[0047]
  By the way, in the above-described mower, the left and right front wheels 2 are trimmed by the blade 21 of the grass that has been stepped over by the left and right front wheels 2 in the mower 4 in consideration of the length and arrangement of the blades 21 provided in the mower 4. It is fixedly installed in a state where it is arranged so as to be located in an area where it is easy to perform. However, in the mower, the mower 4 may be replaced with one having a different cutting width depending on the length of the blade 21 or the number of equipment, and such replacement of the mower 4 is performed as described above with the left and right front wheels 2 fixed. If this is done with a mower, the left and right front wheels 2 will fall out of the area where it is easy to cut with the blade 21 of the grass that has been stepped over by the left and right front wheels 2 in the replaced mower 4, resulting in a decrease in cutting performance. Sometimes.
[0048]
  Therefore, as shown in FIG. 12, the left and right front wheels 2 are equipped so as to be independently displaceable in the left-right direction with respect to the front frame 37, so that the grass that has been stepped over by the left and right front wheels 2 in the connected mower 4 It may be configured such that the position can be easily changed within the region 76 where the blade 21 can be easily cut, so that a reduction in the cutting performance due to the replacement of the mower 4 can be avoided.
[0049]
  The state shown in FIG. 12A is the appropriate region for the mower 4 equipped with three blades 21 having a relatively short length (the blade 21 of the grass that has been stepped over by the left and right front wheels 2 in the mower 4). In this state, the left and right front wheels 2 are arranged in the area 76, and the state shown in FIG. 12B is a mower 4 equipped with three blades 21 having a relatively long length. This is a state in which the left and right front wheels 2 are arranged in the appropriate region 76 for the.
[0050]
    [Another embodiment]
  As the continuously variable transmission 15, a disc type or belt type may be employed.
[Brief description of the drawings]
[Fig. 1] Overall side view of mower
[Figure 2] Overall plan view of mower
FIG. 3 is a plan view of the front side of a traveling machine body showing a braking operation structure.
FIG. 4 is a longitudinal side view of a main part showing a state where a brake pedal is located at a non-braking position.
FIG. 5 is a longitudinal side view of a main part showing a state in which a brake pedal is held at a braking position.
FIG. 6 is a lower front view of a traveling machine body showing a state where a jack is held in a retracted position.
FIG. 7 is a lower front view of a traveling machine body showing a state in which a jack is switched to an action posture and extended.
FIG. 8 is a side view of the front side of the mower showing a state where the jack is switched to the working posture and extended.
FIG. 9 is a longitudinal front view showing the structure of the jack.
FIG. 10 is a cross-sectional plan view of the main part showing the jack positioning structure.
FIG. 11 is a longitudinal side view of a main part showing a holding state of the jack in the retracted posture by the operation unit.
FIG. 12 is a schematic plan view of the main part showing the configuration when the front wheels are equipped so that the position can be changed.
[Explanation of symbols]
  1 Airframe
  3 Drive wheels
  8 Boarding steps
  10 Shift lever
  15 continuously variable transmission
  24 Brake pedal
  25 Rock pedal
  32 Operation part (brake pedal)
  34 Operation part (lock pedal)

Claims (1)

The traveling machine body is provided with a pair of continuously variable transmissions that independently shift the left and right drive wheels corresponding to the shift levers based on the operation of the left and right shift levers. A brake pedal and a lock pedal that enables the brake pedal to be held in the braking position at a location ;
Arrange the operation part of the brake pedal and the operation part of the lock pedal side by side in the vicinity of the left and right,
By disposing the swing fulcrum of the brake pedal behind and below the operation part of the brake pedal, and disposing the rocking fulcrum of the lock pedal in front and below the operation part of the lock pedal, A brake operation structure for a mower in which the depression direction of the operation portion of the brake pedal and the depression direction of the operation portion of the lock pedal are set differently .

Images