JP2004236617A - Braking operation structure of mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking operation structure of a mower having improved operability and a simplified interlocking structure. <P>SOLUTION: The braking operation structure of a mower has the following construction. The traveling machine body 1 is provided with a pair of stepless speed changer 15 to independently change the speed of the right and left driving wheels 3 by the operation of the corresponding right and left gear shift levers 10. A brake pedal 24 and a lock pedal 25 to keep the brake pedal 24 to the braking position are arranged at the right and left of the front middle position of a riding step 8 of the machine body 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking operation structure of a mowing machine equipped with a pair of continuously variable transmissions that independently shift right and left drive wheels corresponding to shift levers based on operation of left and right shift levers. .
[0002]
[Prior art]
Conventionally, as a braking operation structure of a mower as described above, a brake pedal and a brake lever are provided, and in any of these operations, a braking state corresponding to the operation amount thereof can be exhibited, and It is possible to display a parking state in which the brake state is maintained by holding the brake lever in the braking position, or to display a braking state corresponding to the operation amount by operating the brake pedal. In some cases, the brake lever is operated in the braking state, and the brake pedal is held at the braking position to produce a parking state in which the braking state is maintained (for example, see 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]
Of the above prior arts, in the former prior art in which both the brake pedal and the brake lever are used as a braking operation tool and the brake lever is also used as a parking operation tool, the brake pedal is In addition, since the brake lever must be linked to the braking mechanism so that the braking state can be revealed by any of these operations, the linkage structure for enabling the operation of the braking mechanism is complicated.
[0005]
Further, in the latter prior art in which the brake pedal is used as an operating tool for braking and the brake lever is used as an operating tool for parking, each of them is arranged at a position where it is easy to operate. A linkage structure that allows the brake pedal (located at the foot position) and the brake lever (located on the side of the driver's seat) to be 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 a foot position near the brake pedal in order to simplify the linkage structure, it becomes difficult to operate the brake lever during parking.
[0006]
Further, in any of the above-mentioned conventional techniques, since the brake lever is used as a parking operation tool, when parking the body, the left and right shift levers are operated to the neutral position with both hands, and the one foot is used for parking. Operate the brake pedal (operating the brake lever with one hand in the former conventional technology is also possible) to stop the braking of the aircraft, then operate the brake lever with one hand to brake the brake pedal (the brake lever in the former conventional technology). For example, when the aircraft is to be re-run, the brake lever is operated with one hand to release the brake pedal (the former conventional brake lever) at the braking position. Operate the brake pedal with one foot (the former conventional technology can also operate the brake lever with one hand) to release the braking stop of the aircraft. Later, in both cases, the left and right shift levers are operated from the neutral position to a desired traveling position with both hands, so that in each case, it is necessary to change the shift lever and the brake lever during a series of operations. In addition, depending on the positional relationship between the shift lever and the brake lever, there is a possibility that an erroneous operation due to unexpected contact or the like at the time of gripping them may be caused.
[0007]
By the way, in order to avoid complication of the linkage structure, it is conceivable that the braking state and the parking state are made to appear only by operating the brake lever, but according to this configuration, only when the aircraft is parked, In addition, even in the case of braking the body, it is necessary to switch from the shift lever to the brake lever, so that it becomes difficult to immediately respond when an emergency braking operation is required during traveling.
[0008]
An object of the present invention is to provide a braking operation structure of a mower that can improve operability while simplifying a linkage structure.
[0009]
[Means for Solving the Problems]
〔Constitution〕
In order to achieve the above object, in the present invention, the traveling body includes a pair of continuously variable transmissions that independently shift the left and right drive wheels corresponding to the shift lever 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 a braking position are provided side by side at the front left and right center positions of the boarding step of the traveling body.
[0010]
[Action]
According to the present invention, when braking the fuselage, 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 fuselage, use the left and right hands with both hands. While holding the shift lever, operate the brake pedal with one foot to stop the aircraft braking, and 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 holding at the braking position, and operate the brake pedal with that foot or the other foot to brake the aircraft. After releasing the stop, the left and right shift levers may be operated with both hands from the neutral position to a desired traveling position.
[0011]
In other words, whether the vehicle is to be braked, the vehicle is parked, or the aircraft is re-run, the lever is changed as in the case where the vehicle is braked or parked by lever operation. Since there is no need to do so, it is easy to respond promptly in the event of an emergency braking operation, and the aircraft can be parked and re-run quickly with a series of operations that do not require the lever to be changed. At the same time, erroneous operation due to unexpected contact or the like when the lever is changed can be avoided.
[0012]
Further, since the configuration is such that the body can be braked only by operating the brake pedal, it is possible to avoid complication of the linkage structure that occurs when the 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 and close to each other, the linkage structure for enabling the lock pedal to hold the brake pedal at the braking position can be simplified. Further, since the lock pedal is operated by the foot, the operability is not deteriorated by the juxtaposition of the lock pedal and the brake pedal arranged at the foot position.
[0014]
In addition, since the brake pedal and the lock pedal are arranged side by side at the center of the front left and right sides of the boarding step, when parking with one foot operating the brake pedal and the other foot operating the lock pedal, In addition to being forced into an uncomfortable position with the lower body twisted to the pedal side relative to the upper body as in the case where the brake pedal and the lock pedal are arranged side by side on the front left and right side of the boarding step, At the time of maneuvering, both feet are naturally placed as footrests, and at the time of getting on and off, a wide footrest area can be secured at both left and right sides of the boarding step which is a stepping-off step.
[0015]
〔effect〕
Therefore, it is possible to provide a mowing machine braking operation structure capable of improving the operability while simplifying the linkage structure, and also to improve the livability and the getting on / off property.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an overall side view of the riding type mower, and FIG. 2 shows an overall plan view of the riding type mowing machine. A mower 4 is provided between a pair of left and right front wheels 2 of a caster type, which is arranged to be able to follow and steer, and a pair of right and left rear wheels 3, which are arranged as driving wheels at the rear of the traveling body 1. It has a mid-mount configuration.
[0017]
As shown in FIGS. 1 to 3, the traveling body 1 has a boarding operation unit 5 formed on the front side thereof, and a driving unit 6 disposed on the rear side thereof. Boarding step 8 laid on the side of the vehicle, a driver's seat 9 disposed on the rear side of the body frame 7, a shift lever 10 provided to be able to swing left and right of the driver's seat 9, and a rear part of the driver's seat 9 in the body frame 7. Is formed from a fall protection frame 11 erected on the floor.
[0018]
The prime mover 6 includes an air-cooled engine 13 mounted on an engine frame 12 located behind the body frame 7, a transmission 14 disposed in front of the lower portion of the engine 13, and a pair of hydrostatic oils distributed on the left and right sides of the transmission 14. The power from the engine 13 is transmitted from a type of continuously variable transmission (an example of a continuously variable transmission) 15 and left and right reduction gears 16 extending from the corresponding hydrostatic continuously variable transmission 15 to the left and right rear wheels 3. While transmitting the power to the transmission 14 and distributing the power to the right and left traveling and working in the transmission 14, the right and left traveling power from the transmission 14 is transmitted by the corresponding hydrostatic continuously variable transmission 15. After shifting, the 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 14 is transmitted to the transmission 18 of the mower 4 via the transmission shaft 17. It is configured to.
[0019]
In the driving unit 6, the left and right reduction gears 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 stepless transmissions 15 are connected to 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 body 1, the left and right shift levers 10 are linked to the corresponding hydrostatic continuously variable transmission 15, and when each of the left and right shift levers 10 is operated, the corresponding hydrostatic continuously variable shift is performed based on the operation. The device 15 is operated for independent gear shifting, and the power after each gear shift is transmitted to the corresponding left and right rear wheels 3.
[0021]
That is, the traveling body 1 operates the left and right transmission levers 10 to independently operate the pair of hydrostatic continuously variable transmissions 15 to stop transmission to the left and right rear wheels 3. A straight traveling state in which the forward or reverse power at a constant speed is transmitted to the rear wheel 3, a gentle turning state in which different forward or reverse powers are transmitted to the left and right rear wheels 3, and a transmission to one of the left and right rear wheels 3. And a pivot turning state in which forward power or reverse power is transmitted to the other, and a spin turning state in which forward power is transmitted to one of the left and right rear wheels 3 and reverse power is transmitted to the other. Can appear.
[0022]
The mower 4 is installed in a housing 20 suspended and supported by the body frame 7 via a link mechanism 19 so as to be able to move up and down. The three blades 21 for mowing driven by high-speed rotation are rotated such that a part of their rotation locus overlaps, and at each overlapping point, the left blade 21 is directed backward and the right blade 21 is directed forward. In a state where the direction is set, the blades 21 are arranged side by side in the left and right direction. By rotating each of the blades 21, the grass is cut, and the transport wind generated by these rotations is generated. Thus, the cut grass is discharged from a discharge port formed on the right side of the housing 20.
[0023]
As shown in FIGS. 1 to 7, at the front left and right center positions of the boarding step 8 in the traveling body 1, a single unit linked via a linking mechanism 23 to a braking mechanism 22 built in each of the left and right reduction gears 16. Of the brake pedal 24 and a lock pedal 25 that enables the brake pedal 24 to be held at the braking position are adjacent to each other on the left and right sides with the brake pedal 24 located on the right side and the lock pedal 25 located on the left side. Are juxtaposed.
[0024]
The linking mechanism 23 includes a left-right support shaft 26 rotatably supported on the body frame 7 about a left-right axis, and a corresponding brake mechanism from a link arm 27 fixed to both left and right ends of the support shaft 26. The left and right operation rods 29 laid across the operation arms 28 of the 22 and the coil spring 30 externally fitted to the rear of each operation rod 29, and the like, allow the brake pedal 24 with the axis of the support shaft 26 as a fulcrum. The left and right braking mechanisms 22 are configured to perform a braking operation so that a braking state corresponding to the amount of the stepping operation is obtained in conjunction with the stepping operation from the non-braking position.
[0025]
The brake pedal 24 includes a base end 31 extending from the support shaft 26 of the linkage mechanism 23 and an operation section 32 extending from the base end 31. The spring is urged to return to the non-braking position by a coil spring 33 spanned over the same.
[0026]
The lock pedal 25 is provided with an operation portion 34 at an upper end thereof, and an engagement portion 36 which is engageable with an engaged portion 35 which is formed by bending the base end 31 of the brake pedal 24 at the lower end thereof. In this state, a balance 38 is supported by a bracket 38 mounted on the front frame 37 of the body frame 7 in the left-right direction via a support shaft 39 in the left-right direction so as to be freely swingable around its axis. The engaging portion 36 is separated from the engaged portion 35 of the brake pedal 24 by the coil spring 33, and the lower end portion is urged to return to the unlocked position where the lower end portion contacts the front frame 37. The operation from the unlocked position to the locked position is prevented by the engaged portion 35 of the engagement 24, and the operation from the unlocked position to the locked position is performed only when the brake pedal 24 is depressed to the lower limit position. There has been designed to be acceptable.
[0027]
Then, the brake pedal 24 is depressed to the lower limit position, the lock pedal 25, which is permitted to operate from the unlocked position to the locked position, is operated to the locked position, and then 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 bias of the coil spring 33 described above. 24 is held at the braking position, and the lock pedal 25 is held at the locked position.
[0028]
When the brake pedal 24 is depressed in a state where the brake pedal 24 is held at the braking position and the lock pedal 25 is held at the lock position, the engaged portion 35 of the brake pedal 24 is disengaged from the engaging portion 36 of the lock pedal 25. The brake pedal 24 and the lock pedal 25 are released from the engagement by their engagement, and the lock pedal 25 is returned from the locked position to the unlocked position by the bias of the coil spring 33, and the brake pedal 24 is released. The brake pedal 24 is returned to the non-braking position and oscillated by the bias of the coil spring 33 with the release of the depression of the brake pedal.
[0029]
From the above configuration, when the traveling body 1 is to be braked, the brake pedal 24 is depressed with the right foot while holding the left and right shift levers 10 with both hands, so that the braking state corresponding to the depressed operation amount is performed. When the vehicle 1 is parked, the brake pedal 24 is depressed to the braking position with the right foot while holding the left and right shift levers 10 with both hands, and the vehicle 1 is parked. After stopping the braking, the lock pedal 25 is operated from the unlocked position to the locked position with the left foot, and the depressing operation of the brake pedal 24 is released in that state, whereby the parking state where the brake pedal 24 is held at the braking position is released. When the traveling body 1 is driven from the parking state, the brake pedal 24 is depressed with the right foot to operate the brake pedal 24. After releasing the holding in the moving position and releasing the depressing operation of the brake pedal 24 by the right foot to release the braking stop of the traveling body 1, the left and right shift levers 10 are moved from the neutral position to the desired traveling position with both hands. By operating, a running state corresponding to the operating position of the left and right shift levers 10 can appear.
[0030]
In other words, in any of the case where the braking state appears, the case where the parking state appears, and the case where the traveling state appears from the parking state, the appearance of the braking state or the parking state of the traveling body 1 is operated by lever operation. Since it is not necessary to change the lever as in the case where the driving mechanism is configured to be operated, it is easy to promptly respond when an emergency braking operation is required. The appearance of the state can be promptly performed by a series of operations that do not require the lever to be changed without causing an erroneous operation due to unexpected contact or the like when the lever is changed.
[0031]
In addition, since the brake pedal 24 and the lock pedal 25 are arranged side by side and close to each other, the linkage structure for enabling the lock pedal 25 to hold the brake pedal 24 at the braking position can be simplified, and Since the brake pedal 24 and the lock pedal 25 are arranged side by side at the front left, right and center of the boarding step 8, the parking state is displayed by operating the brake pedal 24 with the right foot and the lock pedal 25 with the left foot. At the time of getting out, an unnatural posture in which the lower body is twisted toward the pedal side with respect to the upper body as in the case where the brake pedal 24 and the lock pedal 25 are arranged side by side at the front left and right sides of the boarding step 8, for example. In addition to this, both the left and right sides of the boarding step 8, which is a footrest where both feet are naturally located during maneuvering and is a stepping point when getting on and off, are not required. 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 left and right ends of the front frame 37 can follow and steer the front wheel 2 around a vertical axis. Is provided.
[0033]
In addition, the front frame 37 swings between a storage position along the front frame 37 and an operation position standing upright around the axis of the front-rear support shaft 42 provided at the left and right intermediate portion. A jack 43 is provided so as to be capable of dynamic switching and stored in the front frame 37 when switched to the storage position, and to be able to expand and contract when switched to the operating position.
[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 driving unit 46 that slides the slide leg 45, and a drive. An operation section 47 detachably connected to the section 46 is provided.
[0035]
The swing leg 44 is formed such that a square pipe-shaped leg member 49 extends toward one side from a swing fulcrum member 48 fitted externally to the support shaft 42, and the swing fulcrum member 48 has a front part. The jack 43 is positioned in the retracted position by engaging the first locking hole 50 formed in the frame 37, and the jack 43 is positioned in the operating position by engaging the second locking hole 51 formed in the front frame 37. A locking pin 52 is provided, and the locking pin 52 is engaged and urged by a coil spring 53, and is operated by an operation arm 54 provided at a rear portion thereof in the engagement releasing direction against the urging of the coil spring 53. Operation becomes possible, and furthermore, the spring receiving pin 55 attached to the intermediate portion thereof is engaged with the concave portion 56 formed in the swing fulcrum member 48, so that movement in the engagement releasing direction is prevented. ing.
[0036]
The sliding leg 45 has a female screw portion 58 fixedly mounted at one end of a square pipe 57 which is slidably and non-rotatably fitted to the leg member 49 of the swing leg 44, and a support shaft 59 at the other end. It is constituted by connecting the grounding member 60 so as to be able to swing back and forth via the.
[0037]
The driving part 46 is configured to connect the other end of the feed shaft 62 having a male screw part 61 screwed to the female screw part 58 of the sliding leg 45 on one end side to the support shaft 42 and the swing leg 44 externally fitted thereto. To the swing fulcrum member 48 in a direction perpendicular to the axis of the support shaft 42, and at the penetrating protruding end thereof, preventing the other end from coming off from the support shaft 42 and the swing fulcrum member 48. By attaching the retaining member 65 having the portion 63 and the to-be-fitted portion 64 having a rectangular 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 operating section 47 extends the operating rod 67 from the other end of the square pipe 66 whose one end is detachably fitted to the fitted section 64 of the driving section 46 in a direction orthogonal to the axis of the square pipe 66. When it is detached from the driving unit 46, the square pipe 66 can be inserted into a 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 of the jack 43 switched to the retracted position in a state where the ground member 60 of the sliding leg 45 is in contact with the upper inner surface of the front frame 37, and the operating rod 67 is The front frame 37 can be brought close to and along the lower end.
[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 by a thrust bearing 69. A beta pin 70 for preventing removal from the stop hole 68 is detachably provided. Openings 71 and 72 are formed in the boarding step 8 and the front frame 37 to allow the operation unit 47 to be attached to the drive unit 46 in a state where the jack 43 is switched from the storage position to the operation position.
[0040]
With the above configuration, when performing maintenance such as cleaning the inside of the mower 4 or replacing the blade 21, first, at the disembarkation position in front of the traveling machine body, the operating portion of the jack 43 through the locking hole 68 of the front frame 37. Then, the locking pin 52 of the jack 43 is pulled out from the first locking hole 50 of the front frame 37, the jack 43 is switched from the retracted position to the operating position, and the locking pin 52 is moved to the front frame. After engaging with the second locking hole 51 of the 37 and positioning it in the working posture, the operating section 47 is externally fitted to the drive section 46 from the boarding step 8 and the openings 71 and 72 of the front frame 37, and the operating section is 47 is rotated about the axis of the drive unit 46, and the sliding leg 45 is slid downward by the screw feed operation of the drive unit 46, so that the jack 43 extends and the traveling body Is lifted with the axle 73 of the rear wheel 3 as a fulcrum, and accordingly, the mower 4 is in a front-up position in which the interior is opened forward, so that the Maintenance can be easily performed without the trouble of removing the mower 4 from the traveling machine body 1.
[0041]
After the maintenance is completed, the operation part 47 is rotated around the axis of the drive part 46 so that the slide leg 45 is slid upward by the screw feed operation of the drive part 46. For example, the jack 43 is contracted to release the lifting of the front part of the traveling body about the axle 73 of the rear wheel 3 as a fulcrum. After the lifting is released, the operation part 47 is removed from the driving part 46 and the locking pin is released. 52 is pulled out from the second locking hole 51 of the front frame 37, the jack 43 is switched from the operating position to the retracted position, and the locking pin 52 is engaged with the first locking hole 50 of the front frame 37. If the operation part 47 is inserted into the locking hole 68 of the front frame 37 and is prevented from coming off by the beta pin 70 after that, the jack 43 can be held in the storage posture 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 storage position of the jack 43, it is possible to avoid a reduction in appearance due to the jack 43 being exposed to the outside in the normal state in which the jack 43 is switched to the storage position. At the same time, there is no inconvenience that the jack 43 switched to the storage position enters the elevating area of the mower 4 and hinders the elevating operation of the mower 4.
[0043]
In addition, by disposing the support shaft 42 serving as a swing fulcrum of the jack 43 at the left and right intermediate portion of the front frame 37, the jack 43 stands upright at the left and right intermediate portion of the front frame 37 in its working posture. In addition, the front side of the traveling body 1 is moved up and down with the axle 73 of the rear wheel 3 as a fulcrum by the expansion and contraction operation in the standing state, and further, the jack 43 is moved with the elevation of the traveling body 1. Since the support shaft 59 connecting the grounding member 60 allows a tilting displacement in the front-rear direction, the front and rear sides of the traveling body 1 can be easily and quickly moved up and down in a stable state with a good left-right balance and a small displacement of the machine center of gravity. Will be able to do that.
[0044]
As shown in FIGS. 2 and 4 to 8, a rubber mat 74 for preventing slippage is laid on the upper surface of the riding step 8, and covers the riding step 8 and the openings 71 and 72 of the front frame 37. A tongue 75 that can be rolled up from the open state is provided, so that the tongue 75 can cover the riding steps 8 and the openings 71 and 72 of the front frame 37 when the jack 43 is not used. Therefore, the appearance can be prevented from being deteriorated due to the exposure of the openings 71 and 72, and when the jack 43 is used, the tongue-shaped portion 75 can be simply turned up, and the boarding step 8 and the front portion can be prevented. 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 operation portion 47 is attached to the drive portion 46 of the jack 43 that has been switched to the operating position, when the brake pedal 24 is located at the non-braking position, When the brake pedal 24 is located at the braking position, the brake pedal 24 does not interfere with the operation rod 67 of the operation unit 47.
[0046]
In other words, only when the parking state in which the brake pedal 24 is held at the braking position by the lock pedal 25 appears, the operation unit 47 of the jack 43 can be rotated, and the jack 43 can be used to rotate the front side of the traveling machine body. Lifting can be performed, thereby preventing unexpected displacement of the body caused by forgetting to apply a brake when lifting the front side of the traveling body 1 with the jack 43.
[0047]
By the way, in the above-mentioned mower, the left and right front wheels 2 are mowing by the blades 21 of the grass which is stepped down by the left and right front wheels 2 of the mower 4 in consideration of the length and arrangement of the blades 21 mounted on the mower 4. Is fixedly installed in a state where it is arranged and set so as to be located in an area where the operation is easy. However, in the mower, the mower 4 may be replaced with a different mowing width depending on the length of the blades 21 or the number of equipments, and such replacement of the mower 4 is performed by fixing the left and right front wheels 2 as described above. When performed with a mower, the mowing performance is reduced due to the left and right front wheels 2 falling out of an area where the blades 21 of grass that have been depressed by the left and right front wheels 2 in the replaced mower 4 are easy to mow. 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 and right directions with respect to the front frame 37, so that grasses which are depressed by the left and right front wheels 2 in the connected mower 4 are removed. A configuration may be adopted in which the position can be easily changed in the area 76 where cutting by the blade 21 is easy to perform, so that a decrease in cutting performance due to replacement of the mower 4 can be avoided.
[0049]
The state shown in FIG. 12A is a proper area for the mower 4 equipped with three relatively short blades 21 (grass blades 21 depressed by the left and right front wheels 2 in the mower 4). 12 shows a state in which the left and right front wheels 2 are arranged in an area 76 in which mowing is easily performed, and the state shown in FIG. 12B shows a mower 4 equipped with three relatively long blades 21. Is a state in which the left and right front wheels 2 are arranged in an appropriate area 76 with respect to.
[0050]
[Another embodiment]
As the continuously variable transmission 15, a disk type or a belt type may be employed.
[Brief description of the drawings]
FIG. 1 is an overall side view of a mower.
FIG. 2 is an overall plan view of the mower.
FIG. 3 is a front plan view of a traveling body showing a braking operation structure.
FIG. 4 is a longitudinal sectional 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 sectional side view of a main part showing a state where a brake pedal is held at a braking position.
FIG. 6 is a lower front view of the traveling body showing a state in which the jack is held in a stowed position;
FIG. 7 is a lower front view of the traveling body showing a state in which the jack is switched to the operating position and extended.
FIG. 8 is a front side view of the mower showing the state in which the jack is switched to the operating position and extended.
FIG. 9 is a longitudinal sectional front view showing a configuration of a jack.
FIG. 10 is a cross-sectional plan view of a main part showing a jack positioning structure.
FIG. 11 is a longitudinal sectional side view of a main part showing a state in which the jack is held in a stored posture by the operation unit.
FIG. 12 is a schematic plan view of a main part showing a configuration in which a front wheel is mounted so as to be changeable in position.
[Explanation of symbols]
1 traveling aircraft
3 drive wheels
8 Boarding steps
10 Shift lever
15 Continuously variable transmission
24 brake pedal
25 Lock pedal

Claims (1)

The traveling body includes a pair of continuously variable transmissions that independently shift right and left drive wheels corresponding to the shift levers based on operations of the left and right shift levers. A brake operating structure for a mowing machine in which a brake pedal and a lock pedal that enables the brake pedal to be held at a braking position are provided at right and left sides.

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