JP2020005545A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To streamline and simplify assembly work by accurately determining a neutral position of a speed change operation pedal with respect to a neutral position of a hydrostatic continuously variable transmission. SOLUTION: An operation input unit 65 of a speed change operation pedal 35 is arranged at a lateral outer portion in the left-right direction of the machine body from a place where a pair of left and right main frames 10A exist, and an operation output unit 63 of the shift operation pedal 35 is provided. The main frame 10A of the pair of left and right main frames 10A is sandwiched between the main frames 10A, and the operation input unit 65 is arranged at the lateral inner portion opposite to the lateral outer portion where the operation input unit 65 is located. The connection point between the linkage rod 64 and the operation output unit 63 in a state where the linkage rod 64 transmitted to the hydraulic stepless transmission is connected to the operation output unit 63 and the hydrostatic stepless transmission is operated in the neutral position. A neutral reference hole 10C that can access the connection point from the lateral outside of the one main frame 10A is formed in one main frame 10A at the position corresponding to the above. [Selection diagram] FIG. 5

Description

  The present invention relates to a work vehicle provided with a hydrostatic continuously variable transmission in a drive system of a traveling device.

In this type of work vehicle, the technology described below has been used.
A hydrostatic stepless transmission is constructed using an axial plunger type variable displacement hydraulic pump and an axial plunger type constant displacement hydraulic motor, and the output from the hydraulic motor is input into the transmission case. Thus, power is transmitted to the left and right rear wheels (for example, see Patent Document 1).

JP 2010-004748 A (see paragraphs 0021, 0032, FIGS. 2, 6, and 7)

In the working vehicle described in Patent Document 1 described above, since the hydrostatic continuously variable transmission is used for the traveling drive system, the traveling speed can be smoothly increased and decreased, but there is room for improvement in the following points. There is.
That is, when determining the neutral position of the shift operation pedal, there is no mark near the shift operation pedal. Therefore, in order to completely match the neutral position of the hydrostatic continuously variable transmission with the neutral position of the shift operation pedal, the neutral position of the shift operation pedal with respect to the neutral position of the hydrostatic continuously variable transmission must be changed several times. It is necessary to perform the assembly while adjusting, and the assembling work itself is troublesome. Further, when connecting the link rod for connecting the shift operation pedal to the hydrostatic waste transmission and the operation arm of the shift operation pedal, there is little room for inserting a tool, and this also leads to troublesome work. It is easy and there is room for improvement in this respect.

  An object of the present invention is to make it possible to accurately determine the neutral position of the shift operation pedal with respect to the neutral position of the hydrostatic continuously variable transmission, so that the assembling work can be performed more efficiently and simplified. .

  A work vehicle according to the present invention includes a pair of left and right main frames supported by a front wheel and a rear wheel, a driving portion located at a front portion of the main frame, and a hydrostatic continuously variable transmission located at a rear portion of the main frame. And a shift operation pedal for shifting the hydrostatic continuously variable transmission, wherein the shift operation pedal includes a pair of left and right operation input units each having a tread surface that can be stepped on. The operation output unit of the speed change operation pedal is disposed at a laterally outer position in the lateral direction of the machine than the existing position of the main frame, and the operation output unit of one of a pair of left and right main frames sandwiches the main frame. A linkage rod, which is disposed at a lateral inner side opposite to the lateral outer side where the operation input unit is located, and transmits a depressing operation of the shift operation pedal to the hydrostatic continuously variable transmission, is connected to the operation output unit. And said static In a state where the pressure type continuously variable transmission is operated to the neutral position, the connection from the lateral outer side of the one main frame to the one main frame at a position corresponding to a connection point between the link rod and the operation output unit. A characteristic feature is that a neutral reference hole that can be accessed at a location is formed.

According to the present invention, the connection point between the link rod and the operation output unit when the hydrostatic continuously variable transmission is operated to the neutral position is accessed from the lateral outside of the main frame using the neutral reference hole. be able to.
Therefore, the neutral position of the shift operation pedal is matched with the neutral position of the hydrostatic continuously variable transmission by fixing the position of the connection point between the link rod and the operation output unit using the neutral reference hole. In this way, the connection between the linkage rod and the operation output unit can be easily performed, and the neutral position of the shift operation pedal with respect to the neutral position of the hydrostatic continuously variable transmission can be accurately determined, thereby improving the efficiency of the assembling work. And simplification can be achieved.
In addition, by using the neutral reference hole as a tool insertion hole, it is possible to work from the lateral outside of the main frame, which has a relatively large space. Therefore, the connecting operation of the linking rod and the operation output unit provided in the narrow space can be easily performed using the space on the lateral outer side of the main frame.

  In the above configuration, it is preferable that the neutral reference hole is formed above a swing fulcrum of the shift operation pedal and below the tread surface.

  According to this configuration, the neutral reference hole is provided at a position as high as possible within the vertical width of the main frame. Therefore, the height of the connection point between the link rod and the operation output unit, which is opposite to the neutral reference hole, can be increased, and the possibility that the connection point comes into contact with another object can be reduced.

  In the above configuration, a mower device is suspended and supported below the main frame via a link device, and the link device includes a front link connected to a front portion of the mower device, and a rear portion of the mower device. And a connection link for interlocking the front link and the rear link, wherein the connection link is provided below the riding step along the upper edge of the main frame, and It is preferable to be provided above the swing fulcrum, and at a location laterally outside the pair of left and right main frames and laterally outside the neutral reference hole.

  According to this configuration, since the connecting link is provided at a position facing the lateral outside of the neutral reference hole, when the mower device is suspended and supported via the link device, the neutral reference hole is closed by the interlocking link. It becomes a state, and it is easy to suppress invasion of other things from the lateral outside to the inside of the main frame.

It is a whole side view of a riding type mower. It is a whole plan view of a riding type mower. FIG. 2 is an overall plan view showing a transmission system and a speed change operation mechanism. It is a side view which shows a speed change operation mechanism. FIG. 3 is a plan view showing a speed change operation mechanism. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. FIG. 3 is an exploded perspective view showing a speed change operation mechanism. It is a side view which shows a terminal cap.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the front-rear direction and the left-right direction in the description of the present embodiment are described as follows unless otherwise specified. That is, the traveling direction (see arrow F in FIG. 1) of the riding type mower to which the present invention is applied during work traveling is “forward”, and the traveling direction to the reverse side (see arrow B in FIG. 1) is “forward”. A direction corresponding to the right side (see arrow R in FIG. 2) with reference to the forward posture in the front-rear direction is “right”, and a direction corresponding to the left side (see arrow L in FIG. 2) is “left”. ".

[Overall configuration of riding mower]
FIG. 1 shows an overall side view of a riding mower as a working vehicle, and FIG. 2 shows an overall plan view of the riding mower. The riding mower includes a pair of left and right steerable front wheels 11 on the front side of a body frame 10 of the traveling body 1 and a pair of left and right drivable rear wheels 12 on the rear side. It is configured to run.
A rear discharge type mower device 4 is suspended below the body frame 10 between the front wheel 11 and the rear wheel 12 in the front-rear direction so as to be able to move up and down. On the rear side of the traveling machine body 1, there is provided a weed collecting device 5 for accommodating the cut grass cut by the mower device 4.

As shown in FIGS. 1 and 2, on a body frame 10 of the traveling body 1, a driving unit 2 is provided at a front portion thereof, and a boarding operation unit 3 is provided at a rear side of the driving unit 2.
In the driving unit 2, the engine 20 is mounted on the body frame 10 in a state where the engine 20 is mounted on the engine hood 21. The power taken from the rear side of the engine 20 is input to the hydrostatic continuously variable transmission 6 at the rear position via the main transmission shaft 22, and the output from the hydrostatic continuously variable transmission 6 is transmitted to the gear transmission mechanism. Is transmitted to the rear axle 12a supported by the left and right rear axle cases 24 via the transmission case 23 in which the rear wheel 12 is driven.
The steering operation of the front wheels 11 is performed by a power steering device (not shown) that operates in accordance with the operation of the steering wheel 31 provided in the boarding driving unit 3.

  From the front side of the engine 20, working power can be taken out. That is, a power take-out mechanism 25 constituted by a belt transmission mechanism is provided on the front side of the engine 20, and the power of the engine 20 is transmitted to the mower device 4 via the PTO shaft 26 provided in the power take-out mechanism 25. I have.

  The boarding operation unit 3 on the rear side of the driving unit 2 is provided with a control panel 30 connected to the rear side of the engine hood 21 and a control unit 3A including a steering wheel 31 and the like. A driver's seat 33 is installed on the rear side of the control section 3A above the boarding step 32 located at the foot of the driver, and a ropes 34 stands upright behind the driver's seat 33.

  The lops 34 are formed in a gate shape in a front view, and the lower ends of the columnar legs 34a, 34a on the left and right sides are opposed to a pair of left and right lopes bases (not shown) integrally provided at the rear end of the body frame 10. Connected and fixed. The upper ends of the left and right columnar legs 34a, 34a are connected by a gate-shaped upper frame 34b, and are provided so as to cover the upper side of the driver's seat 33.

At the front of the body frame 10, a guard frame 15 is provided as a protection member for the front of the body.
The guard frame 15 is provided with a balance weight mounting portion 14 to which a plurality of balance weights can be mounted.

(Boarding driving section)
As shown in FIG. 1 and FIG. 2, the riding operation unit 3 has the shift operation pedal 35 and the brake pedal 36 positioned above the riding step 32 and at the side of the right side of the control unit 3A. Are arranged. A parking brake pedal 37 is provided at the foot on the left side of the control section 3A.
The speed change operation pedal 35 is linked to the hydrostatic stepless transmission 6 via a speed change operation mechanism 60 described later, and the hydrostatic stepless transmission 6 is shifted by depressing the speed change operation pedal 35.
The brake pedal 36 and the parking brake pedal 37 are linked to a traveling brake device (not shown) via a braking link mechanism 80. The braking linkage mechanism 80 will be described later.

[Mower device]
The mower device 4 includes a housing 40 that is suspended from and supported by the body frame 10 via the link device 13.
The link device 13 includes a front link 13a connected to the left and right sides of the front portion of the mower device 4, a rear link 13b connected to the left and right sides of the rear portion of the mower device 4, a front link 13a on the left and right sides, and a rear link. And a connecting link 13c for interlocking the front link 13b, and a mower lifting cylinder 43 is connected to the upper end of the front link 13a.
The vertical position of the housing 40 with respect to the machine frame 10 can be changed with the expansion and contraction operation of the mower lifting cylinder 43.

  Inside the housing 40, a pair of left and right rotating blades 41, 41 are provided. Each of the rotating blades 41 is rotated about the vertical axis, and is driven at a constant speed in a state in which a part of its rotation locus overlaps with each other, thereby cutting grass and being generated by the rotating motion. The cut grass is discharged rearward from a discharge port formed in the rear part of the housing 40 by the transport wind.

(Weed collecting device)
As shown in FIG. 1 and FIG. 2, the grass collecting device 5 is configured such that the grass collecting container 50 for storing the cut grass and the grass collecting container 50 can be moved up and down and the cut grass discharging operation with respect to the traveling machine 1. And an elevating drive mechanism 51 for operation.
The grass collecting container 50 has a receiving port (not shown) for receiving the cut grass supplied from the mower device 4 via the transport duct 42 at the front end side, and has a discharge port 50a for discharging at the rear end side and the discharge port 50a. An opening / closing lid 50b that covers the outlet 50a.

The lifting drive mechanism 51 includes a lifting link 52 that connects the grass collection container 50 to a rope 34 provided on the rear side of the traveling body 1, and a lift cylinder 53 that moves the lifting link 52 up and down with respect to the rope 34. A dump cylinder 54 for changing the posture of the grass container 50 with respect to the lifting link 52 from a nearly horizontal recovery posture to a rearwardly inclined backward inclined posture, and opening and closing the opening / closing lid 50b of the grass collection container 50; It has.
The lifting link 52 includes a pair of left and right upper links 52a and a pair of left and right lower links 52b. The front ends of each of the upper links 52a and the lower links 52b are detachably connected to the upper part of the rope 34, and the rear side is a grass container. 50 is connected to a lower portion near the rear end side. The upper end of the lift cylinder 53 constituted by a hydraulic cylinder is connected to the lower link 52b, and the elevating link 52 swings by the expansion and contraction operation of the lift cylinder 53, and the elevating operation of the grass collection container 50 is performed. Will be

The dump cylinder 54 constituted by a hydraulic cylinder is disposed below the rear end side of the grass collection container 50. By the expansion and contraction operation of the dump cylinder 54, the grass collection container 50 can be swung around a swing support point p1 provided at a lower portion on the rear end side. Thus, the dumping container 50 can be switched between a dumping posture in which the front end is lifted and tilted rearward and a collecting posture in which the front end is lowered and which is almost horizontal, so that the dumping container 50 can be switched. One end of the cylinder 54 is connected to a well-known dump operation mechanism (not shown).
The lift cylinder 53 and the dump cylinder 54 are provided as a left and right pair, and are provided in a hydraulic circuit so as to operate simultaneously on the left and right.

The above-described hydrostatic continuously variable transmission 6, the power steering device, the lift cylinder 53, the dump cylinder 54, and the mower elevating cylinder 43 are supplied from a pressure oil supply pump (not shown) driven by the power of the engine 20. Pressure oil is supplied.
The hydrostatic continuously variable transmission 6 includes a variable displacement hydraulic pump (not shown) driven by the power of the engine 20 and a variable displacement hydraulic motor (not shown), like the hydraulic oil supply pump. , Are connected by a closed circuit.

(Shift operation mechanism)
The speed change operation mechanism 60 that links the hydrostatic continuously variable transmission 6 and the speed change operation pedal 35 provided in the riding operation section 3 is configured as follows.
The speed change operation mechanism 60 includes a speed change arm 62 provided on a speed change operation shaft 61 of the hydrostatic continuously variable transmission 6, an operation output unit 63 integrally linked to the depression operation of the speed change operation pedal 35, and an operation output unit thereof. And a link rod 64 for linking the speed change arm 62 to the gear 63.

  As shown in FIGS. 5 to 7, the speed change operation pedal 35 is located on the outer side of the body frame 10 across the right side main frame 10 </ b> A and has a tread surface 65 a that can be operated. It includes a plate 65 (corresponding to an operation input unit), an operation output unit 63 located on the inner side of the body with the main frame 10A interposed, and a transmission shaft unit 66 connecting the stepping plate 65 and the operation output unit 63. I have.

The transmission shaft 66 includes a boss 70 penetrating in the left-right direction through a support hole 10B formed in the main frame 10A, a support shaft 71 inserted into the boss 70 and supported so as to be relatively rotatable. A cylinder shaft 72 which is fitted on the support shaft 71 and is positioned laterally outside the boss portion 70, and a detent pin 73 which penetrates the cylinder shaft 72 and the support shaft 71 in the radial direction.
The boss portion 70 includes a fixing flange portion 70A that abuts on an inner surface of the main frame 10A on the lateral side of the fuselage. The boss portion 70 is connected and fixed to the main frame 10A via the fixing flange portion 70A and the plurality of fixing bolts 70 so as not to rotate relative to each other. I have. The support shaft 71 and the cylindrical shaft 72 integrated with the rotation stop pin 73 rotate relative to the boss 70 around the axis p2 of the support shaft 71 (corresponding to the swing fulcrum of the shift operation pedal). It is freely supported.

Further, in the transmission shaft portion 66, as shown in FIGS. 5 and 7, on the outer peripheral surface of the cylindrical shaft 72, a swing regulating piece 72A is integrally fixed by welding in the front-rear direction. A restricting bracket 38 is welded and fixed to a portion corresponding to the lateral outer side of the main frame 10A and below the boss 70. The regulating bracket 38 is provided with a pair of right and left adjuster bolts 38a, 38a, and is configured so that the amount of protrusion of each of the adjuster bolts 38a, 38a projecting from the upper surface of the regulating bracket 38 can be adjusted.
The restricting bracket 38 is used together with a rocking restricting piece 72A fixed to the cylinder shaft 72 to form a rocking restricting mechanism 67 for setting a permissible range of the rocking angle of the speed change operation pedal 35.

The swing operation angle range of the shift operation pedal 35 by the swing regulation mechanism 67 is substantially the same as the maximum swing angle range of the swash plate (not shown) due to the rotation of the shift operation shaft 61 of the hydrostatic continuously variable transmission 6. Alternatively, it is set to a range smaller than the maximum swing angle range, that is, a range not exceeding the maximum swing angle range of the swash plate.
As a result, even if a strong depressing operation to the side beyond the operation limit is applied to the speed change operation pedal 35, the strong depressing operation force causes the adjuster bolts 38a, 38a of the regulating bracket 38 to come into contact with the swing regulating piece 72A. It is received at places. As a result, there is little possibility that an excessive load is applied to the swash plate of the hydrostatic continuously variable transmission 6.

The stepping plate 65 having the tread surface 65 a is fitted on the support shaft 71, and a pedal arm 74 is erected on the outer peripheral surface of the cylindrical shaft 72 located on the lateral outside of the boss 70, and the upper end of the pedal arm 74. Are fixedly connected via two fixing bolts 74a.
A pin holding member 75 is integrally fixed to the lateral outside of the pedal arm 74 by the fixing bolt 74a. The pin holding member 75 extends at the position opposite to both ends of the rotation preventing pin 73 penetrating the cylinder shaft 72 and the support shaft 71 in the radial direction so as to embrace the outer peripheral surface of the cylinder shaft 72.

The operation output unit 63 is configured to be rotatable integrally with a support shaft 71 that is rotatably supported by a boss 70 fixed to the main frame 10A.
The operation output unit 63 includes a swing arm 76 having a lower end connected to a support shaft 71 at a position exposed from an end of a boss 70 protruding inward from the main frame 10A in the lateral direction of the fuselage. And a connection shaft member 77 attached to the upper part. The connecting shaft member 77 has a spherical connecting portion 77 a formed in a spherical shape at a protruding end portion, and the spherical connecting portion 77 a is connected to the link rod 64.

  The linkage rod 64 includes a front end side shaft portion 64A, a rear end side shaft portion 64B, and an intermediate shaft portion 64C. A male rod portion 64Ca provided at both ends of the intermediate shaft portion 64C and female screw portions 64Aa and 64Ba provided at the front end side shaft portion 64A and the rear end side shaft portion 64B are screwed into one rod-shaped material. Can be used. The length of the link rod 64 can be adjusted by adjusting the screwing allowance of the female screw portions 64Aa and 64Ba of the front end shaft portion 64A and the rear end shaft portion 64B with respect to the male screw portion 64Ca of the intermediate shaft portion 64C. Have been.

  The front end side shaft portion 64A is provided with a joint portion 64Ab at a position where the front end side shaft portion 64A is connected to a connection shaft member 77 provided above the swing arm 76. The rear end side shaft portion 64B is provided with a joint portion 64Bb at a position where the rear end side shaft portion 64B is connected to a connection shaft member 77 provided above the speed change arm 62. Each of the joint portions 64Ab and 64Bb has a spherical receiving concave portion that can be fitted onto the spherical connecting portion 77a. The joint portions 64Ab, 64Bb and the spherical connecting portions 77a, 77a are fitted to form a ball joint structure. Thus, the link rod 64 is connected to the swing arm 76 and the speed change arm 62 so as to be changeable in relative posture.

The lower part of the speed change arm 62 is connected and fixed to the speed change operation shaft 61. One end of a damper 68 is connected to the upper part of the speed change arm 62 together with the link rod 64. The other end of the damper 68 is connected to the main frame 10A.
The urging direction of the damper 68 is such that the speed change arm 62 that swings in accordance with the stepping of the speed change operation pedal 35 toward the front side and the step toward the rear side is moved toward the neutral return side, that is, the hydrostatic stepless transmission. 6 is directed to the side that swings to return the speed change operation shaft 61 to the neutral position.

[Neutral reference hole]
In the apparatus provided with the speed change operation mechanism 60 configured as described above, in the present invention, a neutral reference hole 10C is formed in the main frame 10A on the right side of the body frame 10 provided with the speed change operation pedal 35. are doing.
The neutral reference hole 10C is provided between the front end side shaft portion 64A of the link rod 64 and the connecting shaft member provided above the swing arm 76 when the hydrostatic continuously variable transmission 6 is operated at the neutral position. It is provided at a position corresponding to the connection point with the reference numeral 77.

The neutral reference hole 10C is formed above the axis p2 of the support shaft 71 corresponding to the swing fulcrum of the speed change operation pedal 35 and below the tread surface 65a exposed above the boarding step 32. .
The neutral reference hole 10C is used to connect a front end side shaft portion 64A of the link rod 64 to a connection shaft member 77 provided on an upper portion of the swing arm 76 by inserting a tool from the lateral outside of the main frame 10A. The fastening nut 78 provided at the location is used when fastening or releasing the fastening.

The interlocking connection between the shift operation pedal 35 and the shift operation shaft 61 using the neutral reference hole 10C is performed as follows.
That is, first, in a state where the shift operation pedal 35 is located at the center of the swinging movement range, the front end side shaft portion 64A of the link rod 64 and the connecting shaft member 77 provided on the upper portion of the swing arm 76 are connected. The fastening nut 78 provided at the connection point is fastened and fixed.
Next, the speed change arm 62 is positioned in a state where the hydrostatic continuously variable transmission 6 is operated to the neutral position. With respect to the upper part of the speed change arm 62 in this state, by adjusting the screwing allowance of the female screw portions 64Aa, 64Ba of the front end side shaft portion 64A and the rear end side shaft portion 64B with respect to the male screw portion 64Ca of the intermediate shaft portion 64C, the length is increased. The adjusted linkage rod 64 is connected.

The work is performed by inserting a tool from the lateral outside of the neutral reference hole 10C after removing the link device 13 used for suspending the mower device 4 from the body frame 10.
That is, the link device 13 that suspends and supports the mower device 4 includes the front link 13a, the rear link 13b, and the connection link 13c. The connecting link 13c is located below the boarding step 32 along the upper edge of the main frame 10A and above the axis p2 of the support shaft 71 corresponding to the swing fulcrum of the speed change operation pedal 35, and It is provided at a location outside the main frame 10A and outside the neutral reference hole 10C.
Therefore, by removing the connecting link 13c, a wide space on the lateral outer side of the neutral reference hole 10C can be ensured to make it easier to insert a tool.

(Brake linkage mechanism)
As shown in FIG. 5, the brake pedal 36 is linked to the traveling brake device via a brake link mechanism 80.
The brake link mechanism 80 includes an operating body 81 interlocked with the support shaft 36a of the brake pedal 36, a brake operating arm 83 for applying a braking force to the rear wheel 12, and a brake rod for transmitting the operation of the operating body 81 to the brake operating arm 83. 82.
Therefore, the depression operation force of the brake pedal 36 is transmitted to the brake operation arm 83 via the operation body 81 interlocked with the support shaft 36a and the brake rod 82. The brake operation arm 83 is supported by an interlock shaft 84 that is long in the left-right direction so as to be rotatable integrally. The depressing operation force of the brake pedal 36 is branched right and left via the interlocking shaft 84 so that the braking force can be simultaneously applied to the left and right rear wheels 12 and 12.
The operation body 81 is integrally provided with a parking operation rod 81a for a parking brake.

As shown in FIG. 3, the parking brake pedal 37 is disposed at the left front part of the driving unit step 32.
The parking brake pedal 37 is connected to the left end of the operation shaft 85 which is long in the left-right direction, and is provided so as to be able to swing up and down around the axis of the operation shaft 85. A hook 86 is integrally mounted on the operation shaft 85 which rotates in conjunction with the depressing operation of the parking brake pedal 37.
Therefore, when the parking brake pedal 37 is depressed while the brake pedal 36 is depressed, the hook 86 interlocked with the depressing operation of the parking brake pedal 37 is engaged with the parking operation rod 81a of the operating body 81. That is, by engaging the hook 86 with the parking operation rod 81a of the operating body 81, the parking brake pedal 37 is linked to the traveling brake device via the brake linking mechanism 80.
As a result, even if the depression of the brake pedal 36 is released, the operating body 81 maintains the braking operation state of the brake operating arm 83 via the brake rod 82. As a result, the traveling brake device plays a role as a parking brake.

(Harness terminal cap)
A terminal cap 29 is attached to a terminal portion of the harness 28 to the starter motor 27 in the driving unit 2.
As shown in FIG. 8, the terminal cap 29 has an opening 29a for drainage formed at the center of the terminal cap 29 in a side view. Thereby, it is easy to avoid the possibility that rainwater or the like accumulates in the terminal cap 29.

[1 of another embodiment]
In the embodiment, the neutral reference hole 10C is formed by a round hole provided at one position of the main frame 10A, but the present invention is not necessarily limited to this structure. For example, the neutral reference hole 10C may be formed by a slot other than a round hole or a notch, or may be provided at a plurality of locations.
Other configurations may employ the same configuration as the above-described embodiment.

[2 of another embodiment]
In the embodiment, the connection structure of the link rod 64 to the swing arm 76 and the speed change arm 62 is exemplified by a ball joint structure in which the joint portions 64Ab, 64Bb and the spherical connecting portions 77a, 77a are fitted. It is not limited to this structure. For example, a simple shaft support structure or a structure using a universal joint may be used.
Other configurations may employ the same configuration as the above-described embodiment.

  INDUSTRIAL APPLICABILITY The present invention is applicable not only to various types of riding mowers ranging from large machines to small machines, but also to various working machines.

Reference Signs List 2 Drive unit 4 Mower device 6 Hydrostatic stepless transmission 10A Main frame 10C Neutral reference hole 11 Front wheel 12 Rear wheel 13 Link device 13a Front link 13b Rear link 13c Connection link 35 Transmission operation pedal 63 Operation output unit 64 Linking rod 65 Operation input section 65a Tread surface p2 Swing fulcrum

Claims (3)

A pair of left and right main frames supported by front and rear wheels,
A driving unit located at the front of the main frame;
A hydrostatic continuously variable transmission located at the rear of the main frame,
A shift operation pedal for shifting the hydrostatic stepless transmission, and
Of the speed change operation pedals, an operation input unit having a tread surface that can be operated by a foot is disposed at a laterally outer portion in the lateral direction of the vehicle than a position where the pair of left and right main frames is present,
An operation output unit of the speed change operation pedal is disposed at a lateral inner side opposite to a lateral outer side where the operation input unit is located, with one main frame of the pair of left and right main frames interposed therebetween,
A link rod for transmitting a stepping operation of the speed change operation pedal to the hydrostatic continuously variable transmission is connected to the operation output unit,
In the state where the hydrostatic continuously variable transmission is operated to the neutral position, the one main frame at a position corresponding to a connection point between the link rod and the operation output unit is laterally outside the one main frame. A working vehicle, wherein a neutral reference hole is formed so that the connection point can be accessed from the vehicle.   The work vehicle according to claim 1, wherein the neutral reference hole is formed above a swing fulcrum of the speed change operation pedal and below the tread surface. A mower device is suspended and supported via a link device below the main frame,
The link device includes a front link connected to a front portion of the mower device, a rear link connected to a rear portion of the mower device, and a connection link that links the front link and the rear link,
The connection link is located below a boarding step along an upper edge of the main frame, above a swing fulcrum of the speed change operation pedal, and is laterally outside the pair of left and right main frames, and The work vehicle according to claim 1, wherein the work vehicle is provided at a position facing a lateral outer side of the neutral reference hole.

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