JP3397645B2 - Work vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front portion provided with front wheels.
Connect the aircraft and the rear aircraft with rear wheels with left and right frames
Then, while constructing a frame type traveling aircraft,
Allows to equip a working device between the front wheel and the rear wheel
For more information about existing work vehicles, see
The pedal and the pedal are located on the right side of the vehicle,
The hydrostatic continuously variable transmission and the braking device are connected to
Is installed on the left side of the vehicle.
Regarding work vehicles .

[0002]

2. Description of the Related Art Conventionally, in a work vehicle gear shift operation structure as described above, the linkage between the shift pedal arranged on the right side and the operation arm of the hydrostatic continuously variable transmission located on the left side of the traveling body is made up of an operation rod. A geared linkage mechanism, such as a gearbox, is extended in a substantially straight line from the gearshift pedal to the operation arm of the hydrostatic continuously variable transmission, and the brake pedal located on the right side and the braking located on the left side of the traveling machine body The linkage with the operation arm of the device has been considered to be carried out by hanging a braking linkage mechanism including an operation rod or the like in a substantially straight line from the brake pedal to the operation arm of the braking device.

[0003]

By the way, in a work vehicle such as a tractor or a lawn mower, an engine is mounted on the front part of the work vehicle, and a hydrostatic continuously variable transmission is mounted on the rear part of the work vehicle. It is common to configure a traveling transmission system from the engine to the hydrostatic continuously variable transmission at the rear of the machine. Therefore, as in the above-described conventional technique, the linkage between the shift pedal and the operation arm of the hydrostatic continuously variable transmission, and the linkage between the brake pedal and the operation arm of the braking device are each extended in a substantially straight line. If it is performed by each linkage mechanism, it becomes necessary to intersect the traveling transmission system with each linkage mechanism. Therefore, the traveling transmission system and each linkage mechanism must be vertically displaced. . Moreover, depending on the positional relationship between the shift pedal, the brake pedal, and the operation arms of the hydrostatic continuously variable transmission and the braking device, it is necessary to intersect the linkage mechanisms with each other, and they must be displaced in the vertical direction. It may not be. Therefore, according to the above-mentioned conventional technique, the traveling transmission system,
Since a relatively large space in the lower part of the machine body is required in the lower part of the machine body in constructing the gear change linkage mechanism and the braking linkage mechanism, the vehicle height becomes higher by that amount and the stability of the machine body deteriorates. If the vehicle height is limited in order to prevent inconvenience and deterioration of stability, the travel transmission system or the position of each linkage mechanism will be lowered by that amount, so travel transmission during ridge crossing etc. The system or each linking mechanism is likely to be brought into contact with another object on the ground side, which causes a problem that the traveling transmission system or each linking mechanism is easily damaged due to contact with another object. Particularly, in a mid-mount type lawnmower equipped with a mower that can be raised and lowered in the lower front and rear part of the traveling machine body, since the mower transmission system and the elevating link mechanism are equipped in the lower part of the machine body, the right gear pedal or It becomes quite difficult to hang each linkage mechanism in a substantially straight line from the brake pedal to each operation arm of the hydrostatic continuously variable transmission or the braking device, and each transmission system, each linkage mechanism, and lift Since the link mechanism is complicated, it is difficult to carry out maintenance of the link mechanism.

An object of the present invention is to link a shift pedal arranged on the right side of the machine body with an operating arm of a hydrostatic continuously variable transmission located on the left side of the machine body, and a brake pedal arranged on the right side of the machine body and a position on the left side of the machine body. Ingenuity in the linkage with the operating arm of the braking device causes deterioration of the stability of the airframe and damage due to contact with other components of the traveling transmission system and each linkage mechanism for shifting or braking. An object of the present invention is to provide a work vehicle gear shift operation structure that can avoid inconveniences and is advantageous in terms of manufacturing and maintenance.

[0005]

In order to achieve the above object, in the invention according to claim 1 of the present invention, the front wheels are
The front and rear aircraft with the rear wheels are
Frame to connect to form a frame-type vehicle
At the same time, the working device is installed between the front wheel and the rear wheel.
In a work vehicle that is equipped with a gear , a shift pedal and a brake pedal are arranged on the right side of the traveling machine body, and a hydrostatic stepless transmission and a braking device are provided on the left side of the traveling machine body with their operating arms. Equipped to be positioned ,
On the left and right frames, the operation axis across them is the horizontal axis
And an intermediate transmission member that extends over the left and right frames relative to the operating shaft, and the right end of the operating shaft is attached to one of the speed change pedal and the brake pedal. While linked, the left end of the operation shaft is linked to one operation arm corresponding to the shift pedal or the brake pedal linked to the right end thereof, and
The right end of the intermediate transmission member is linked to the other of the shift pedal and the brake pedal, and the left end of the intermediate transmission member is linked to the right end of the other operation arm corresponding to the shift pedal or the brake pedal. Coordinated. In the invention according to claim 2 of the present invention,
In the invention according to claim 1, the right end of the operation shaft is
Link to one of the shift pedal and brake pedal
The transmission pedal and the right end of the intermediate transmission member.
And a linking member linked to the other of the brake pedal,
Was distributed to the inside and outside of the right frame.

[Operation] According to the present invention, the rotation shaft core is used in common for the linkage between the shift pedal and the operation arm of the hydrostatic continuously variable transmission, and the linkage between the brake pedal and the operation arm of the braking device. Since it is performed via the operation shaft or the intermediate transmission member,
Due to the positional relationship between the operation arm of the hydrostatic continuously variable transmission and the operation arm of the braking device, even if it is necessary to intersect the gear shifting linkage mechanism and the braking linkage mechanism with each other, the linkage mechanisms can be moved vertically. There is no need to shift the position. Further, since the operation shaft and the intermediate transmission member are rotary operation systems, the speed change pedal or the brake pedal and the operation shaft or the intermediate transmission member,
And an operating rod or the like that links the operating shaft or the intermediate transmission member with the operating arm of each hydrostatic stepless transmission or the operating arm of the braking device can be arranged in parallel to the traveling transmission system. Become. Further, since the operation shaft and the intermediate transmission member are rotary operation systems having their rotation axes in common, the transmission pedal or the brake pedal and each operation arm of the hydrostatic stepless transmission or the braking device are connected. , When they are linked by a linkage mechanism of a push-pull operation system which is stretched in a substantially straight line between them, or when they are linked by a linkage mechanism in which the operation shaft and the intermediate transmission member are provided so that their rotation axis cores are not common Compared with the case, in order to transmit the operating force of the shift pedal or the brake pedal from the right side of the machine body where those pedals are located to the left side of the machine body where the operation arms of the hydrostatic stepless transmission and the braking device are located. Since the required space in the front-rear direction and the up-down direction of the machine can be made extremely small, the traveling transmission system and the machine-body front end that are configured from the engine at the front of the machine to the hydrostatic continuously variable transmission at the rear of the machine It will allow to place the tiny space formed between the or between aircraft rear.

From the above point of view, the operating shaft and the intermediate transmission member having the common rotation axis are arranged between the traveling transmission system and the front end of the machine body or the rear end of the machine body, and the operation shaft or the intermediate transmission member. By linking the right end of the member to the speed change pedal or the brake pedal with an operation rod or the like, and connecting the left end of the operation shaft or the intermediate transmission member to the operation arm of the hydrostatic stepless transmission or the braking device with the operation rod or the like,
The transmission pedal or brake pedal is hydrostatically operated at the same height as the traveling transmission system without the transmission transmission mechanism and the braking linkage mechanism being intricately intersected with the traveling transmission system. It becomes possible to link to the operation arm of the continuously variable transmission or the braking device, which increases the vehicle height in configuring the traveling transmission system, the gear shifting linkage mechanism, and the braking linkage mechanism. It is possible to avoid the inconvenience that the stability deteriorates and the inconvenience that the travel transmission system or each linkage mechanism is likely to be damaged due to contact with other objects when traveling over the ridge by limiting the vehicle height, and , Even if the work vehicle is a mid-mount type lawn mower, it extends from the shift pedal or brake pedal on the right side to the operation arm of the hydrostatic stepless transmission or braking device on the left side. It is possible to assemble the linkage mechanism easily, running and Mohr transmission system, shifting and braking linkage mechanism, as well as maintenance such as lifting link mechanism is facilitated.

[Effects] Accordingly, the operation shaft and the intermediate shaft having the common rotation axis are linked to the operation of the gearshift pedal or the brake pedal on the right side of the machine body and the operation arm of the hydrostatic stepless transmission or braking device on the left side of the machine body. By making ingenuity to use the rotary operation system consisting of transmission members, the stability of the machine body is deteriorated, and damage due to contact with other components of the traveling transmission system and gear shifting or braking mechanisms is likely to occur. It has become possible to provide a work vehicle gear shift operation structure that can avoid such disadvantages and that is advantageous in terms of manufacturing and maintenance.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire side surface of a riding type lawnmower, which is an example of a work vehicle. This riding type lawnmower is located at an intermediate position in the front-rear direction of a traveling machine body 1 via a lifting link mechanism 2 and a mower 3. It is configured as a mid-mount type by connecting up and down freely. The traveling vehicle body 1 includes an engine 5 mounted on a front portion of the vehicle body frame 4, a radiator 6 arranged behind the engine 5, an axle frame 7 supported on a front portion of the vehicle body frame 4, and a rear portion of the vehicle body frame 4. Front wheel 1 as a steering wheel mounted on the left and right ends of the axle frame 9 and the axle case 9, respectively.
0, a rear wheel 11 as a drive wheel mounted on each of the left and right ends of the axle case 9, a steering wheel 12 linked to the front wheel 10, a driver's seat 13 arranged above the rear portion of the body frame 4, and the like. Is configured.

As shown in FIGS. 1 to 5, the body frame 4
A transmission case 14 having a bevel gear type transmission mechanism (not shown) is provided in front of the axle case 9 in FIG. The transmission case 14 has an input shaft 14a projecting forward from the front portion thereof and is connected to the engine 5 via a transmission shaft 15 and the like so as to be able to be transmitted. A first output pulley 14b operably connected to an input pulley 8a of the hydrostatic continuously variable transmission 8 via a first transmission belt 16 is provided at an upper portion of the transmission case 14, and is provided at a rear portion of the traveling machine body 1, for example. A second output pulley 14c for supplying power to a blower device (not shown) that causes the grass to flow from the mower 3 toward the grass container when a grass container (not shown) is attached Have been deployed in parallel. A third output pulley 14d, which is movably connected to the input pulley 3a of the mower 3 via a second transmission belt 17, is connected to the lower portion of the transmission case 14 via an electromagnetic clutch 18 so that transmission can be switched.
The first transmission belt 16 is maintained in a tension state (transmission state) by the urging of the first tension spring 20 via the first tension pulley 19. The second transmission belt 17 is maintained in a tension state (transmission state) by the urging of the second tension spring 22 via the second tension pulley 21. That is, at the bottom of the traveling machine body 1, a traveling transmission system A configured by the transmission shaft 15, the transmission case 14, the first transmission belt 16, the first tension pulley 19, the first tension spring 20, and the like.
From the engine 5 at the front of the machine body to the hydrostatic continuously variable transmission 8 at the rear of the machine body, the second transmission belt 17, the second tension pulley 21, and the second tension spring 2
A mower transmission system B composed of 2 and the like is provided so as to extend from the transmission case 14 to the mower 3.

The axle case 9 is internally provided with a braking device 23. The braking device 23 and the hydrostatic continuously variable transmission 8 are provided with their operating arms 23a and 8b located on the left side of the traveling machine body 1. Equipped. On the other hand, the brake pedal 24, which is linked to the operation arm 23a of the braking device 23 via the braking linking mechanism C, and the operation arm 8b of the hydrostatic stepless transmission 8 are linked via the shifting linking mechanism D. The shift pedal 25 is arranged on the right side of the traveling machine body 1. The braking linkage mechanism C is rotatably installed around the horizontal axis P1 across the left and right frames 4A and 4B at the rear end of the machine body frame 4 located behind the hydrostatic continuously variable transmission 8. The operation shaft 26, the first swing arm 27 fixed to the right end of the operation shaft 26, the operation rod 28 extended from the brake pedal 24 to the first swing arm 27, and the first swing arm 27 and the operation. A linking spring 29 interposed between the rod 28, a second swing arm 30 fixed to the left end of the operating shaft 26, and a second swing arm 30 that is extended from the second swing arm 30 to the operation arm 23a of the braking device 23. Operation link 31, and operation arm 23 of the brake pedal 24 and the braking device 23
It is composed of a biasing spring 32 for biasing a to return to a non-braking posture. The gear shifting linkage mechanism D is mounted on the operating shaft 26 of the braking linkage mechanism C so as to be rotatable relative to the left and right frames 4A and 4B. Linking link 3 pivotally connected to a first operation arm 33a extending from the right end of the member 33.
4, the operating rod 35 hung from the transmission pedal 25 over the link link 34, and the second operating arm 33b extending from the left end of the intermediate transmission member 33 to the operating arm 8b of the hydrostatic stepless transmission 8. It is composed of an operation link 36 and the like that are spanned over. Speed change pedal 2
5 and the operation arm 8b of the hydrostatic continuously variable transmission 8 include a roller 37a contacting a substantially V-shaped cam 8c formed on the operation arm 8b, and a swing arm 37b provided with a roller 37a at a free end thereof. , And a biasing spring 37c for biasing the swinging arm 37b in a direction to bring the roller 37a into contact with the cam 8c.
By the action of the neutral arm 37 configured by, the neutral state is automatically restored.

That is, the brake pedal 24 and the braking device 2
3 and the operation arm 23a, and the shift pedal 25
And the operation arm 8b of the hydrostatic continuously variable transmission 8 are linked through the operation shaft 26 or the intermediate transmission member 33, which is a rotary operation system having a common rotation axis P1. , Pushing and pulling these linkages so as to be extended in a substantially straight line between the brake pedal 24 or the speed change pedal 25 and the operation arm 23a of the braking device 23 or the operation arm 8b of the hydrostatic continuously variable transmission 8. Compared with the case where the operation is performed by the linkage mechanism configured only by the system or the case where the linkage mechanism is configured such that the rotation shaft core P1 of the operation shaft 26 and the intermediate transmission member 33 is not shared, the brake pedal 24
And the operating force of the speed change pedal 25,
From the right side of the machine body where 25 is located, the operation arm 23a of the braking device 23 and the operation arm 8b of the hydrostatic continuously variable transmission 8
The space in the machine front-rear direction and the up-down direction required to transmit to the left side of the machine can be made extremely small,
As a result, the traveling transmission system A formed from the engine 5 at the front of the machine to the hydrostatic continuously variable transmission 8 at the rear of the machine.
The minimum space S formed between the rear end of the machine body and the rear end of the machine body can be effectively used as a space for transmitting the operating force of the brake pedal 24 and the shift pedal 25 from the right side of the machine body to the left side of the machine body. .

Then, as described above, the operation shaft 26 and the intermediate transmission member 33 having the common rotation axis P1 are arranged in the minimal space S between the traveling transmission system A and the rear end of the machine body, and operated. The right end of the shaft 26 or the right end of the intermediate transmission member 33 is linked to the brake pedal 24 or the speed change pedal 25 by the operation rods 28, 35, and the left end of the operation shaft 26 or the left end of the intermediate transmission member 33 is an operation arm of the braking device 23. 23a
Alternatively, by linking to the operation arm 8b of the hydrostatic continuously variable transmission 8 with the operation links 31, 36, etc., the traveling transmission system A, the mower transmission system B, and the lifting link mechanism 2 are linked to the braking linkage mechanism C and The brake pedal 24 or the shift pedal 25 is placed at the same height position as the traveling transmission system A without the intricately intersecting state of the speed change linkage mechanism D, and the brake pedal 24 or the speed change pedal 25 is moved to the operation arm 23a of the braking device 23 or the hydrostatic pressure. Since it can be linked to the operation arm 8b of the continuously variable transmission 8, the vehicle height becomes high in configuring the traveling transmission system A, the braking linkage mechanism C, and the shifting linkage mechanism D. The inconvenience that the stability of the airframe deteriorates and the travel transmission system A, the braking linkage mechanism C, and the gear shifting linkage that are caused by contact with other objects when traveling over the ridge by limiting the vehicle height It is possible to avoid the inconvenience of causing the mechanism D to be easily damaged, and the operation arm 23a of the braking device 23 on the left side or the operation arm 8b of the hydrostatic continuously variable transmission 8 from the brake pedal 24 or the transmission pedal 25 on the right side. Braking linkage mechanism C and shifting linkage mechanism D
Can be easily assembled, and maintenance of the traveling transmission system A, the mower transmission system B, the braking linkage mechanism C, the speed change linkage mechanism D, the lifting link mechanism 2 and the like can be facilitated. ing.

As shown in FIGS. 1 and 6, the elevating link mechanism 2 includes a pair of left and right front links 38 provided over the front part of the machine frame 4 and the front part of the mower 3, and the front and rear of the machine frame 4. A pair of left and right rear links 39 laid across the intermediate portion and the rear portion of the mower 3, a rotary shaft 40 rotatably supported on the rear portion of the machine body frame 4 about a horizontal axis P2, and at both ends of the rotary shaft 40. The pair of left and right swing arms 41 are fixed to each other, and the pair of left and right link links 42 are provided so as to span the rear link 39 and the swing arm 41. Further, the elevating and lowering link mechanism 2 is provided with an operating lever 43 for raising and lowering a mower which is swingably supported by the machine body frame 4 about a horizontal axis P3, and a force in the mower raising direction when the operating lever 43 operates to raise the mower. The assisting mechanism 44 for giving is provided.

The operating lever 43 has a first operating arm 4
3A and the swinging arm 41 on the right side are linked via a linking member 45. The swinging operation upward about the horizontal axis P3 raises the mower 3 via the lifting link mechanism 2 and The mower 3 is lowered via the lifting link mechanism 2 by a downward swinging operation around the axis P3. A locking pin 43B is provided at the base end of the operating lever 43 so as to project toward the distal end side of the operating lever 43 by a coil spring (not shown) incorporated in the operating lever 43. An operation tool 43C that moves the locking pin 43B toward the base end against the bias of the coil spring by being pressed at the tip of the operation lever 43.
Is projected. A regulation guide plate 46, which has a long hole 46A for regulating the swinging range of the operation lever 43 between the locking pin 43B and the locking pin 43B, is provided upright from the machine body frame 4 on the side of the base end portion of the operation lever 43. ing. At the upper end of the long hole 46A, there is a recess 46B into which the locking pin 43B is engaged by the bias of the coil spring when the operating lever 43 is rocked to the upper limit position. Lever 4
When the rocking operation of 3 is performed to the lower limit position, the recesses 46C into which the locking pins 43B are inserted by the biasing of the coil springs are respectively provided in series, and the locking pins 43B are inserted into these recesses 46B and 46C. Thus, the operation lever 43 can be fixedly held at the upper limit position or the lower limit position. or,
By pressing the operation tool 43C, those recesses 46B,
By releasing the locking pin 43B from 46C,
The fixed holding of the operating lever 43 at the upper limit position or the lower limit position can be released.

The assist mechanism 44 includes a first gas cylinder 44A installed over the machine body frame 4 and an operation arm 47 fixed to the rotary shaft 40, and a second operation arm 43D of the machine body frame 4 and the operation lever 43. The second gas cylinder 44B is installed over the
When operating the operation lever 43, the first gas cylinder 44A
The second gas cylinder 44B and the second gas cylinder 44B apply a force in the ascending direction to the mower 3 via the ascending / descending link mechanism 2, whereby the operating force required to raise the mower 3 by operating the operating lever 43 can be reduced. ing. Operating arm 47
The first connecting hole 47a to which the first gas cylinder 44A is connected when the 48-inch mower 3 is connected to the lifting link mechanism 2 and the 54-inch mower 3 to the lifting link mechanism 2.
And a second connecting hole 47b to which the first gas cylinder 44A is connected when the two are connected to each other, whereby the size (weight) of the mower 3 to be connected to the elevating and lowering link mechanism 2 is increased.
The operating arm 47 of the single first gas cylinder 44A does not have to be changed according to the requirement.
By changing the connecting position with respect to, the operating force required for raising the mower 3 can be made constant regardless of the size of the mower 3. In other words, it is possible to combine the parts equipped with the 48-inch mower 3 and the parts equipped with the 54-inch mower 3 with each other, and one type of traveling machine body 1 can be used for the mowers 3.
Can be handled by.

[Other Embodiments] Other embodiments of the present invention will be listed below. The work vehicle may be a lawn mower such as a front mower type or a reel mower type, or a tractor. Brake pedal 24 and operation arm 2 of braking device 23
3a through an intermediate transmission member 33, and the shift pedal 25 and the operation arm 8b of the hydrostatic continuously variable transmission 8.
And may be linked via the operation shaft 26. The intermediate transmission member 33 is formed in a tubular shape on which the operation shaft 26 is fitted, and the rotary operation system is configured to have a double shaft structure including the operation shaft 26 and the intermediate transmission member 33 having a common rotation axis P1. May be. The rotary operation system including the operation shaft 26 and the intermediate transmission member 33 having the common rotation axis P1 may be arranged in a space formed between the traveling transmission system A and the front end of the machine body.

[Brief description of drawings]

1] Overall side view of a riding lawn mower

FIG. 2 is a plan view of a main part showing a linkage configuration of a gear shift operation structure.

FIG. 3 is a perspective view showing a linkage configuration of a shift operation structure.

FIG. 4 is a vertical cross-sectional front view of a main portion showing a linkage configuration of a gear shift operation structure.

FIG. 5 is a left side view of a main portion showing a linkage structure of a gear shift operation structure.

FIG. 6 is a vertical cross-sectional left side view of a main part showing a configuration of an assist mechanism in a lifting link mechanism.

[Explanation of symbols]

1 Traveling Vehicle 3 Working Device 4A Frame (Left) 4B Frame (Right) 8 Hydrostatic Stepless Transmission 8b Operation Arm (Hydrostatic Stepless Transmission) 10 Front Wheel 11 Rear Wheel 23 Braking Device 23a Operation Arm (Braking Device) ) 24 brake pedal 25 speed change pedal 26 operation shaft 28 link member 33 intermediate transmission member 35 link member P1 horizontal axis core

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masago Murakawa 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Corporation Sakai Factory (72) Inventor, Genya Harada, 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. In-house (56) References JP-A-5-143184 (JP, A) JP-A-8-40102 (JP, A) Actually open 57-52330 (JP, U) Actually open 2-43720 (JP, U) ) Actual Development Sho 55-62422 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 20/00-20/08 F16H 59/00-59/12 F16H 61/26-61 / 36 F16H 63/00-63/38 G05G 1/00-25/04

Claims (2)

(57) [Claims] 1. A front body including front wheels and a rear including rear wheels
Frame type by connecting to the aircraft with left and right frames
And the front wheels and the rear wheels.
It is a work vehicle that makes it possible to equip work equipment between
Te, a shift pedal and brake pedal as well as disposed on the right side of the traveling machine body, an a hydrostatic stepless transmission and brake device equipped as their operating arm located on the left side of the traveling machine body, the On the left and right frames, control over them
The work shaft is rotatably passed around a horizontal axis, and an intermediate transmission member extending over the left and right frames is relatively rotatably attached to the operation shaft, and the right end of the operation shaft is connected to the shift pedal and the brake. While linking to one of the pedals, the left end of the operating shaft is linked to one operating arm corresponding to the shift pedal or the brake pedal linked to its right end, and the right end of the intermediate transmission member is while linked to the other of the change pedal and the brake pedal, a work vehicle wherein the left end of the intermediate transmission member, are in conjunction with the other operating arm corresponding to the shift pedal or the brake pedal has been linked to its right end. 2. A linking member that links the right end of the operation shaft to one of the shift pedal and the brake pedal, and a linking member that links the right end of the intermediate transmission member to the other of the shift pedal and the brake pedal. The work vehicle according to claim 1, wherein the and are distributed by being distributed inside and outside the right frame.