JP2000324909A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a working vehicle in which the good longitudinal weight balance of a vehicle body can be ensured by disposing the seat of an operation portion at a position above the engine of a motor portion disposed at a specific position. SOLUTION: In this working vehicle, a vehicle body frame 2 is disposed between a pair of right and left crawler type travel portions 1, and an operation portion 3, a motor portion 4 and a transmission portion 5 are arranged on the vehicle body frame 2. The travel portions 1 are interlocked and connected to the motor portion 4 through the transmission portion 5, and further connected to a working machine connected to the rear portion of the vehicle body frame 2 through a rear PTO shaft. Therein, the engine 60 of the motor portion 4 is disposed on the front half portion side of the vehicle body frame 2, and the seat 48 of the operation portion 3 is disposed at a position above the engine 60. A steering wheel 2 is disposed at a position in the front of the seat 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a working vehicle.

[0002]

2. Description of the Related Art Conventionally, as one form of a working vehicle, a body frame is interposed between a pair of left and right crawler traveling parts, and a driving unit, a prime mover unit, and a transmission unit are provided on the body frame. In some sections, the traveling section is interlocked and connected via a transmission section, while the working machine connected to the rear of the body frame can be interlocked and connected via a rear PTO shaft.

[0003] An operating unit is provided at the front of the body frame, and a motor unit and a transmission unit are provided at the rear.

[0004]

However, in the work vehicle described above, since the prime mover unit and the transmission unit are disposed at the rear of the body frame, the center of gravity of the vehicle body is closer to the rear end. When the work machine is connected to the rear of the body frame, the position of the center of gravity of the body is further closer to the rear end,
There is a problem that the front part of the car body rises during work.

[0005] Further, since the seat of the driver is located at a low position close to the vehicle body frame, the height of the ground of the eyes of the operator sitting on the seat is at a low position, and the forward visibility is reduced.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a vehicle body frame interposed between a pair of right and left crawler traveling parts.
A driving unit, a prime mover unit, and a transmission unit are provided on the vehicle body frame, and the working unit connected to the rear of the vehicle body frame is connected to the driving unit by interlocking the traveling unit via a transmission unit. In the work vehicle that can be linked and connected via the engine, the engine of the prime mover unit is arranged in the front half of the body frame, the seat of the driving unit is arranged above the engine, and the steering wheel is arranged in front of the seat It is intended to provide a working vehicle characterized by having done this.

The present invention also has the following configuration.

[0008] A transmission case is connected to the front side of the engine, and a front PTO shaft is projected forward from the transmission case, and a transmission shaft is extended rearward from the transmission case. That the mission section arranged in the area is linked.

The transmission case has an upper part interlockingly connected to an output shaft of the engine, and a lower part deviated to one of the right and left, and a transmission shaft is disposed above the body frame from the lower part to a side of the engine. It was extended along the back.

[0010] A transmission / transmission case is connected to the rear end of the transmission shaft in an interlocking manner.
The protruding shaft allows output of power shifted from the rear PTO shaft.

[0011] The front PTO shaft is arranged near the left and right virtual center lines of the vehicle body frame.

[0012]

Embodiments of the present invention will be described below.

That is, the working machine according to the present invention has a basic structure in which a body frame is interposed between a pair of left and right crawler traveling parts, and a driving unit, a motor unit, and a transmission unit are mounted on the body frame. At the same time, the traveling unit is interlocked to the prime mover unit via the transmission unit, and the working machine connected to the rear of the vehicle body frame can be interlocked via the rear PTO shaft.

As a characteristic structure, an engine of a prime mover unit is arranged in the front half of the body frame, a seat of a driving unit is arranged above the engine, and a steering wheel is arranged in front of the seat. ing.

[0015] In this manner, a good front-to-back weight balance of the vehicle body can be ensured.

Therefore, even when the working machine is connected to the rear of the vehicle body frame, it is possible to prevent the front part of the vehicle body from being lifted up, thereby improving work efficiency.

In addition, it is possible to smoothly pass over a ridge or the like.

Further, since the seat of the driving unit is arranged at a position above the engine, the height of the eyes of the operator sitting on the seat can be set at a high position, and the visibility of the operator in front can be improved. Good, and as a result, work efficiency and safety can be improved.

A transmission case is connected to the front side of the engine so that the front PTO shaft protrudes forward from the transmission case, and the transmission shaft extends rearward from the transmission case. The transmission section located behind is linked and connected.

In this manner, even when the output shaft of the transmission case and the input shaft of the transmission portion are misaligned, the power transmission efficiency is reliably corrected by the transmission shaft while the power transmission efficiency is kept good. be able to.

The transmission case has an upper part interlockingly connected to the output shaft of the engine and a lower part deflected to one of the right and left sides. It extends rearward along with.

In this manner, the transmission shaft can be compactly arranged along the side of the engine, and the transmission shaft can be protected from scattered soil and the like.

Therefore, the transmission function of the transmission shaft can be ensured well.

A transmission / transmission case is connected to the rear end of the transmission shaft in an interlocking manner.
The O-shaft is protruded to output power shifted from the rear PTO shaft.

In this manner, the driving force of the working machine interlockingly connected to the rear PTO shaft can be changed according to the working purpose, so that working efficiency can be improved and the type of adaptive work can be expanded.

The front PTO shaft is arranged near the left and right virtual center lines of the body frame.

[0027] In this manner, the interlocking connection of the front working machine to the front PTO shaft can be easily performed.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

A shown in FIGS. 1 and 2 is a working vehicle according to the present invention. The working vehicle A has a working machine B connected to the rear thereof via a lifting mechanism C.

The work vehicle A has a body frame 2 interposed between a pair of left and right crawler-type traveling units 1 and 1, and an operation unit 3 is disposed on the body frame 2 at a front portion thereof. The prime mover unit 4 is arranged below the seat 48 of the third
A transmission unit 5 is disposed at a rear position of the vehicle, and the traveling units 1 and 1 are interlocked to the motor unit 4 via the transmission unit 5.

As shown in FIGS. 3 and 4, the traveling unit 1 has a front driven wheel 11 attached to a front end of a traveling frame 10 extending in the front-rear direction via an idler fork 12, and a rear driven wheel 11 attached to a rear end. A side driven wheel 13 is mounted via a support bracket 14, and a drive wheel 15 is interlockedly connected to a transmission section 5 described later, and a crawler belt 16 is wound around these driven wheels 11, 13, 15. Four crawler belt slippage prevention members 17 are attached to the lower side of 10 at an interval in the front-rear direction, and rolling wheels 18 are attached to each crawler belt slippage prevention member 17. 11a is a front driven wheel support shaft, 12a is a front driven wheel advance / retreat position adjuster, 13a is a rear driven wheel support shaft, and 15a is a drive shaft.

Then, as shown in FIG. 3, the drive wheels 15
At a position behind the center position between the front and rear driven wheels 11 and 13,
It is arranged near the rear driven wheel 13.

Thus, the front driven wheel 11 and the drive wheel 15
The front-rear width of the upper turning side portion 16a of the crawler belt 16 located between the upper turning side portion 16a becomes longer, and as a result, the upper turning side portion 16a vibrates appropriately due to the vibration of the vehicle body, and The mud and the like attached to 16a can be shaken off, and the mud and the like can be prevented from being deposited on the crawler belt 16. Therefore, it is possible to prevent the crawler belt from coming off due to the accumulated mud.

The upper turning side portion 16a of the crawler belt 16 is inclined forward and downward between the front driven wheel 11 and the driving wheel 15 so that the upper turning side portion 16a is located above the upper turning side portion 16a. An arrangement space S for disposing various operation levers provided in the operation unit 3 described later and an interlocking connection mechanism (not shown) interposed between the various operation levers and the transmission unit 5 is formed. are doing.

In this way, the pair of right and left traveling parts 1, 1
In addition, the various operation levers are arranged at positions that are easy for the operator to operate in the arrangement spaces S, S, and the various operation levers and the transmission unit 5 are connected to each other. The interlocking connection mechanism interposed therebetween can be freely arranged, so that the compactness of the vehicle body and good operability can be simultaneously achieved.

As shown in FIGS. 1 to 4, the body frame 2 has a pair of right and left traveling frames 10, 10 extending in the front-rear direction.
A pair of front and rear left and right distraction frames 20, 21 extending in the left and right direction are respectively laid horizontally between the front and rear portions of the vehicle. The front and rear extension frames 22 and 22 are laid horizontally, and the front and rear frame formation bodies 26a and 26c and the left and right frame formation bodies 26b and 26b are rectangular in plan view between the front and rear portions of the front and rear extension frames 22 and 22. A guard frame 26 formed in a frame shape is laterally formed. 27 is a guard frame stay, 80a
Is a drive shaft case, and 80b is a drive shaft case support column.

As shown in FIG. 1, the operating section 3 has a floor portion 36 extending in the front half of the guard frame 26, and a handle column 40 standing upright on the front portion of the floor portion 36. A handle support shaft 41 extending in the up-down direction is inserted into 40, and a rotatable handle (steering wheel) 42 is attached to the upper end of the handle support shaft 41, and the lower end of the handle support shaft 41 will be described later. A cam mechanism (not shown) is connected to the transmission unit 5
In addition, a forward / backward switching lever 44 is attached to the lower portion of the left side wall of the handle column 40, and the forward / backward switching lever 44 and a forward / backward switching mechanism 162 ( 7) via a connecting rod mechanism (not shown), and a brake pedal 46 is attached to a front portion of the floor portion 36, and the brake pedal 46 and the transmission portion 5 described later are provided. Stop brake part 165 (Fig. 7
) Are interlocked and connected via an interlocking wire (not shown).

The seat 48 is located behind the handle 42.
, And various operation levers are arranged on the left and right sides of the seat 48.

That is, the shift lever 49 is located on the left side of the seat 48.
And the transmission lever 49 is moved to the transmission section 5 described later.
The main transmission unit 97 and the auxiliary transmission unit 104 provided inside are interlockingly connected via an interlocking connection mechanism, and the work implement elevating lever 50, the hydraulic lock lever 51, and the plowing depth adjusting lever 52 are The levers 50, 51, 52
And a valve mechanism (not shown) for controlling a working machine elevating / lowering cylinder 224 to be described later via an interlocking connecting mechanism. Further, a PTO shaft clutch lever 53 is disposed outside the working machine elevating lever 50. are doing.

Here, an engine 60 of the motor unit 4 to be described later is arranged on the front half side of the body frame 2.
The seat 48 of the driving unit 3 is arranged at a position above the vehicle, and the handle 42 is arranged at a position in front of the seat 48.

In this way, a good front-to-back weight balance of the vehicle body can be ensured.

Accordingly, the work machine B is provided behind the body frame 2.
Can be prevented from rising up at the front part of the vehicle body, and work efficiency can be improved. In addition, it is possible to smoothly pass over ridges and the like.

Further, since the seat 48 of the driving unit 3 is disposed above the engine 60, the height of the eyes of the operator sitting on the seat 48 can be set to a high position, and The forward visibility can be improved, and as a result, work efficiency and safety can be improved.

The engine unit 4 includes an engine 60 and the engine
A cooling fan 62 is disposed immediately downstream of the cooling fan 62, and a radiator 61 is disposed immediately downstream of the cooling fan 62. The radiator 61 is disposed between the engine 60 and the transmission unit 5. . 67 is an air cleaner and 68 is a muffler.

In this way, the dust and the like that the vehicle body raises while traveling in the field becomes less likely to adhere to the radiator 61,
Clogging can be prevented and the radiator
The cooling efficiency of the 61 cooling fan 62 can be ensured satisfactorily.

Further, a cooling fan is provided at a position behind the engine 60.
The cooling fan 62 is arranged so that cool air can be blown from the cooling fan 62 toward the mission unit 5 side.

In this manner, the transmission unit 5 can be cooled by the cooling fan 62, and the viscosity of the hydraulic oil accommodated in the transmission unit 5 can be ensured well. 5 can function well.

The position of the crankshaft center 60a of the engine 60 is lower than the position of the drive shaft 15a which is the shaft center position of the drive wheels 15.

In this manner, the position of the center of gravity of the engine 60 can be set at a low position, and the traveling safety of the vehicle body can be ensured well.

As shown in FIGS. 1 to 3 and 7, a transmission case 63 is interlockedly connected to the front side of the engine 60.
With the front PTO shaft 64 protruding forward from the transmission case 63 and the transmission shaft 65 extending rearward from the transmission case 63, the transmission unit 5 disposed behind the engine 60 is transmitted to the transmission shaft 65. It is interlocked and connected via a speed change case 70.

Thus, the output shaft 66 of the transmission case 63
Even when the axis between the transmission shaft and the input shaft 140 of the transmission unit 5 is misaligned, the misalignment of the axis can be surely corrected by the transmission shaft 65 while the power transmission efficiency is kept good.

As shown in FIGS. 3, 5, and 7, the transmission case 63 is provided with a transmission input shaft 63b at an upper part in a case body 63a, and the transmission input shaft 63b is connected to the output shaft of the engine 60. 3 and the lower part of the case body 63a is displaced to the left in the front view of FIG. 3, and the transmission shaft 65 is attached to the body frame 2 from the lower part of the case body 63a.
Is extended rearward along the right side of the engine 60 above the right and left distraction frame 20. 63c is a transmission output gear, 63d is an output sprocket, 63e is an input sprocket, 63f is a transmission chain, 64a is a PTO shaft input gear, P1
Is a car wash pump.

In this way, the transmission shaft 65 can be compactly arranged along the side of the engine 60, and the transmission shaft 65 can be protected from flying soil. Therefore, the transmission function of the transmission shaft 65 can be reliably ensured.

A transmission / transmission case 70 is operatively connected to the rear end of the transmission shaft 65, and the rear PTO shaft 71 is projected rearward from the transmission / transmission case 70 so that the rear PTO
The power shifted from the shaft 71 can be output.

That is, as shown in FIG. 7, an input shaft 140 interlockingly connected to the rear end of the transmission shaft 65 and a transmission shaft 141 traversed in parallel with the input shaft 140 are provided in the transmission / transmission case 70 as shown in FIG. And a rear PT which is horizontally mounted in parallel with the transmission shaft 141.
An O-shaft 71 is provided, a transmission-portion-side output bevel gear 142 and a rear PTO-shaft-side output gear 143 are provided on an input shaft 140, and the transmission-portion bevel gear 142 is provided with a While the single shaft 81 is interlocked and connected via an input bevel gear 144, an input gear 145 provided on the speed change shaft 141 is meshed with the rear PTO shaft side output gear 143.

The transmission shaft 141 has a low-speed transmission gear.
146 and the high-speed transmission gear 147 are loosely fitted to each other, and a shift gear 148 is slidably mounted on the transmission shaft 141 between the two transmission gears 146 and 147 so that the shift gear 148 can mesh with one of the transmission gears 146 and 147. Transmission gear 14
The low-speed input gear 149 and the high-speed input gear 150 respectively mounted on the rear PTO shaft 71 mesh with each other to transmit power to the rear PTO shaft 71 from one of the input gears 149, 150. Speed change.

In this way, the driving force of the work implement B interlockedly connected to the rear PTO shaft 71 can be shifted according to the work purpose, so that work efficiency can be improved and adaptive work types can be expanded.

The front PTO shaft 64 is arranged near the left and right virtual center line X of the body frame 2.

In this way, the work of interlocking the front working machine (not shown) to the front PTO shaft 64 can be easily performed.

As shown in FIGS. 1, 2, 4 and 5, the transmission unit 5 is disposed at the rear of the vehicle body frame 2. On the right side of the transmission unit 5, a hydrostatic hydraulic turning type is provided. A continuously variable transmission (hereinafter, referred to as “HST”) 74 is interlocked and connected.

As shown in FIG. 7, the transmission section 5 includes first to ninth shafts 81 to 89 inside a transmission case 80.
In parallel with each other, and a forward clutch 90
a of the first shaft 81 and the end of the first shaft 81
The input side of the reverse clutch 90b loosely fitted in the middle part of the second shaft 82 via the 91 and the hydraulic pump P2 for lifting / lowering the work implement are operatively connected to each other. 90
a and the second shaft which is the output side of the reverse clutch 90b.
82 and the third shaft 83 in conjunction with each other, and a forward / reverse clutch 90
The power transmission of a, 90b is configured to be exclusively selectable, so that the drive direction can be switched between forward and backward. 92 is a hydraulic pump input shaft.

Here, the front / reverse clutches 90a, 90b
A shifter (not shown) for engaging and disengaging a clutch is mounted on a shifter support shaft (not shown) mounted on a front portion in the transmission case 80, and the shifter for engaging and disengaging the clutch is provided in one direction of the shifter support shaft. The forward clutch 90a is connected and the reverse clutch 90b is disconnected in conjunction with the rotation, and the forward clutch 90a is disconnected and the reverse clutch 90b is connected in conjunction with the rotation in the other direction.・ The reverse can be switched.

A forward / reverse switching arm (not shown) is attached to the left end of the shifter support shaft, and a forward / reverse switching lever 44 is connected to the forward / reverse switching arm by a connecting rod mechanism (not shown). Are interlocked and linked.

The third shaft 83 is an input shaft of the HST 74.
74a and a fourth shaft 84 which is an input shaft of the main transmission 97 via a third meshing gear 96. The fourth shaft 84 is connected to dogs 98, 98 at both ends and a central portion. A slider 100 integrally formed with the second speed driving gear 99 is slidably and non-rotatably fitted in the axial direction, while the fourth shaft 84 and the main transmission portion 97 are fitted.
The first and third speed meshing gears 101 and 102 which are always meshing are interposed between the fifth shaft 85 which is the output shaft of the motor, and the second mesh passive speed gear 103 which is sliding meshing is fitted to the fifth shaft 85. The output rotation speed of the main transmission 97 can be switched in three stages by sliding the slider 100.

A sub-transmission unit 104 is connected in series with the main transmission unit 97, and the sub-transmission unit 104 is connected to the fifth shaft 85.
High and low speed meshing gears 105 and 106 are interposed between the shaft and the sixth shaft 86 as an output shaft of the auxiliary transmission portion 104, and the sixth shaft 86 is slidable in the axial direction.
By the sliding of the slider 107 fitted non-rotatably, the output rotation speed of the sub-transmission portion 104 can be shifted in two stages of high and low speeds with a neutral in between.

As described above, the forward / reverse clutches 90a, 90b
, A main transmission section 97 for three-speed shifting, and an auxiliary transmission section 104 for two-speed shifting.
Are linked in series in an interlocking manner, so that a six-step forward / backward shift operation can be finally performed.

The sixth shaft 86 is operatively connected to a seventh shaft 87 via a chain interlocking mechanism 108, and left and right sun gears 110 and 111 fitted to the left and right ends of the seventh shaft 87, respectively.
Left and right cages 112 and 113 connected to the left and right drive shafts 15a and 15a having the same axis as 87, a plurality of left and right planetary gears 114 and 115 respectively mounted on the left and right cages 112 and 113, and an output shaft 74b of the HST 74 interlockingly connected. Left and right ring gear 11
6 and 117 constitute left and right planetary gear mechanisms 118 and 119. The left and right planetary gear mechanisms 118 and 119 transmit the right and left sun gears 110 and 111 by the mechanical linear power transmission system M constituted by the gear type transmission and the meshing gear. Rotational power and the left and right ring gears from HST74 of the turning power transmission system H described later
And the rotational power transmitted to the left and right driving shafts 15 and 15 fitted to the left and right drive shafts 15a and 15a via the left and right planetary gears 114 and 115 and the right and left cages 112 and 113, respectively. They are communicated individually.

At this time, a stopping brake 165 is provided at the left end of the sixth shaft 86, and the brake pedal 46 is interlocked with a brake operating arm (not shown) attached to the stopping brake 165. They are interlockingly connected via wires (not shown).

The output shaft 74b of the HST 74 has the same output shaft
A forward / reverse rotation splitting mechanism 120 for transmitting the rotation speed of the rotation gear 74b to the left and right ring gears 116 and 117 complementarily is located downstream of a turning brake unit (not shown) and is interlockingly connected. 120, the eighth shaft 88 is linked to the output shaft 74b of the HST 74 via the high / low speed switching mechanism 121,
88 is a first intermediate output gear 171;
The left and right output gears 123 and 124 are fitted to the left and right ends of the ninth shaft 89 via a second intermediate input gear 122 and a second intermediate input gear 122 meshed with the left output gear 123 and the left ring gear 11, respectively.
6 are operatively connected via two idle gears (not shown) arranged in series, and the right output gear 124 and the right ring gear 117 are operatively connected via one idle gear 79. Although the absolute values of the rotation speeds are equal, the rotation in the same direction as the ninth shaft 89 is transmitted to the left ring gear 116, while the rotation in the opposite direction to the ninth shaft 89 is transmitted to the right ring gear 117. I have.

The first input shaft of the mission unit 5
One end of the shaft 81 protrudes from the left side wall of the transmission case 80, and the transmission / transmission case 70 is interlocked to the protruding end.

Here, the high / low speed switching mechanism 121 attaches the low speed side output gear 133 and the high speed side output gear 134 to the cylindrical input shaft 130, and moves the high / low speed switching shaft 135 close to the cylindrical input shaft 130. A low-speed side input gear 136 meshing with the low-speed side output gear 133 and a high-speed side input gear 137 meshing with the high-speed side output gear 134 are freely fitted on the high-low speed switching shaft 135, and A slider 138 is fitted between the input gears 136 and 137 so as to be slidable and non-rotatable in the axial direction, and the output rotation speed of the high / low speed switching mechanism 121 is shifted in two stages between high and low speeds by sandwiching the neutral position. It is possible.

The high / low speed switching shaft 135 has an output gear
The output gear 139 is meshed with the input shaft 170 mounted on the eighth shaft 88.

Further, the high / low speed switching mechanism 121 switches the speed to the high speed side in conjunction with the sub-shift operation of the shift lever 49.

In this way, the output shaft 74b of the HST 74 is braked by the turning brake unit (not shown), and the turning power transmission system H is stopped only by setting the steering wheel 42 to the neutral position for left and right steering. State.
As a result, only the straight-line power transmission system M becomes operable,
The straight-moving power transmission system M can ensure good straightness of the vehicle body.

Since the turning brake is provided on the output shaft 74b of the HST 74 provided on the upstream side of the turning power transmission system H, the output shaft 74b can be braked directly with a small torque. Even if the capacity of the turning brake unit is reduced, the power transmission of the turning power transmission system H can be reliably stopped.

Further, by rotating the steering wheel 42 in one of the left and right directions from the left / right steering neutral position, the brake braking of the turning brake unit is released, and the vehicle body can be turned in the rotation direction.

Therefore, the steering operability of the vehicle body, particularly the straight operability, can be improved.

With the above-described structure, the power from the engine 60 is transmitted to the left and right traveling units 1, 1 after being shifted in six stages in the forward and backward directions, and the HST 74 is changed according to the operating angle of the steering wheel 42.
And the driving speeds of the left and right traveling units 1 and 1 are changed so that the working vehicle A
Can be turned.

At this time, if the speed change lever 49 is operated in the auxiliary speed change mode, the high / low speed switching mechanism 121 is switched to the high speed side in conjunction therewith. In this case, the speed of the turning power transmission system H is increased, and the vehicle body turns rapidly, and a turning property corresponding to the vehicle speed is obtained, so that the operator's operation feeling can be improved.

In this embodiment, since the input shaft 74a of the HST 74 is connected to the output side of the reverse clutch 90b, the switching of the forward / reverse clutch 90a, 90b can be performed without operating the handle 42. At the same time, the output rotation direction of the HST 74 is switched, so that the operation direction of the steering wheel 42 and the turning direction of the work vehicle A maintain a constant relationship, and the turning operation can be performed with almost the same feeling as the steering operation of the wheel type vehicle. It can be carried out.

The left and right frame forming bodies of the guard frame 26
26b and 26b have left and right side cover bodies 28 and 29, respectively.
And a fuel tank 30 is integrally attached to the right side cover body 29.

As described above, the fuel tank 30 is disposed above the traveling section 1 on the right side, and a dead space formed above the traveling section 1 (in this embodiment, the dead space is defined as an arrangement space S). ) Can be used effectively and the body frame 2
There is no need to provide a space for disposing the fuel tank 30 above, and the vehicle body can be made more compact.

The fuel tank 30 is formed on the inner surface of the right side cover body 29 so as to extend in the front-rear direction, and the crawler belt is located between the front driven wheel 11 and the drive wheel 15.
16 along the upper rotating side 16a of the fuel tank
An oil supply port 31 is provided at an upper portion of the rear end of 30.

In this way, the refueling port 31 can be arranged at a position where the refueling worker can easily refuel and outside the vehicle body, so that the refueling workability can be improved.

Further, since the outside of the fuel tank 30 is covered by the right side cover body 29, the aesthetic appearance of the vehicle body can be ensured well.

As shown in FIGS. 1, 2 and 7, the working machine B includes a gear case 200, shaft cases 201 and 202 extending from the gear case 200 in the lateral direction, and a left end of the left shaft case 201. Chain case 203 linked to the section
And a support 204 connected to the right end of the right shaft case 202.
And a tilling shaft 205 interposed between the support 204 and the chain case 203, and a number of tilling claws 20 attached to the tilling shaft 205.
6 and the rotary cover 20 covering the upper part of the
7, a rear cover 208 attached to the rear edge of the rotary cover 207, and a hanger rod 209 supporting the rear cover 208. 210 is the input shaft, 211 is the output gear, 212 is the input gear, 213 is the transmission shaft, 214 is the output sprocket, 215 is the input sprocket, 216 is the transmission chain,
217 is an actuator transmission shaft.

As shown in FIGS. 1 and 2, the elevating mechanism C is interposed between the work vehicle A and the work machine B, and includes a top link 220, a pair of left and right lower links 221,221, and lift links 222,222. , Lift arms 223, 223, and a work implement elevating cylinder 224. 225 is a top link stay and 226 is a top link connection bracket.

The left and right lower links 221,221
Is the left and right extension frame on the rear side of the body frame 2
21 are pivotally connected to each other via pivot brackets 230, 230 by pivot pins 231, 231 as pivot portions, and the pivot pins 231, 231 are connected to drive shafts 15a, 15
It is arranged below the lower driven wheel 15a and above the rear driven wheel support shafts 13a, 13a which are the center of rotation of the rear driven wheels 13, 13.

In this way, the traction force of the work vehicle A can be efficiently transmitted to the contact surface side of the traveling units 1 and 1,
Work efficiency by the work machine B of the rear device can be secured well.

The two pivot pins 231 are connected to the drive wheels 15,1.
The rear driven wheel support shafts 13a, 13a, which are behind the drive shafts 15a, 15a, which are the rotation centers of 5, and which are the rotation centers of the rear driven wheels 13, 13,
It is located in front of a.

In this manner, the work vehicle A
Can be efficiently transmitted to the contact surface side of the traveling portions 1 and 1, and the work efficiency of the rear-mounted work machine B can be ensured satisfactorily.

[0092]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the engine of the prime mover unit is disposed on the front half side of the vehicle body frame, the seat of the driving unit is disposed above the engine, and the steering wheel is disposed in front of the seat. Due to the arrangement, the front and rear weight balance of the vehicle body can be favorably secured.

Therefore, even when the working machine is connected to the rear of the vehicle body frame, it is possible to prevent the front part of the vehicle body from being lifted up, thereby improving work efficiency. Moreover,
Crossing over ridges can be done smoothly.

Further, since the seat of the driving section is arranged above the engine, the height of the eyes of the operator sitting on the seat can be set at a high position, and the visibility of the operator in front can be improved. Good, and as a result, work efficiency and safety can be improved.

According to the second aspect of the present invention, the transmission case is interlockedly connected to the front side of the engine, the front PTO shaft is projected forward from the transmission case, and the transmission shaft is extended rearward from the transmission case. Because the transmission shaft is linked to the transmission section located behind the engine, the transmission shaft can be shifted even if the output shaft of the transmission case is misaligned with the input shaft of the transmission section. With good power transmission efficiency,
It can be corrected reliably.

According to the third aspect of the present invention, the upper portion of the transmission case is operatively connected to the output shaft of the engine.
The lower part is displaced to the left or right, and the transmission shaft extends rearward from the lower part along the side of the engine above the body frame. And the transmission shaft can be protected from splashed soil and the like. Therefore, the transmission function of the transmission shaft can be satisfactorily ensured.

In the present invention, the transmission / transmission case is interlockedly connected to the rear end of the transmission shaft, and the rear PTO shaft is projected from the transmission / transmission case so that the rear P
Because the power shifted from the TO shaft can be output,
The driving force of the working machine interlockingly connected to the rear PTO shaft can be changed according to the working purpose, so that working efficiency can be improved and adaptive work types can be expanded.

According to the fifth aspect of the present invention, since the front PTO shaft is disposed near the left and right virtual center lines of the vehicle body frame, the interlocking work of the front working machine to the front PTO shaft can be easily performed. I can do it.

[Brief description of the drawings]

FIG. 1 is a side view of a working vehicle according to the present invention.

FIG. 2 is a plan view of a body frame of the work vehicle.

FIG. 3 is a front view of the work vehicle.

FIG. 4 is a rear view of the work vehicle.

FIG. 5 is a side view of a motor unit and a transmission unit.

FIG. 6 is an explanatory left side view of the fuel tank.

FIG. 7 is a power transmission system diagram.

[Explanation of symbols]

 A Work vehicle 1 Running unit 2 Body frame 3 Operation unit 4 Engine unit 5 Transmission unit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuhisa Yokoyama 428 Enami, Okayama City, Okayama Pref.

Claims (5)

[Claims] A body frame (2) is interposed between a pair of right and left crawler-type traveling parts (1, 1), and an operation part (3) and a motor part (4) are provided on the body frame (2). A transmission section (5) is provided, and the running section (1,1) is linked to the motor section (4) via the transmission section (5).
The work vehicle connected to the rear of (2) can be linked and connected via the rear PTO shaft (71) .The engine (60) of the motor unit (4) is mounted on the front half of the body frame (2). And the driving section above the engine (60)
(3) A work vehicle having a seat (48) arranged therein and a handle (42) arranged in front of the seat (48). 2. A transmission case (63) on the front side of the engine (60).
To the front and forward from the transmission case (63).
A transmission section in which the TO shaft (64) is projected and the transmission shaft (65) is extended rearward from the transmission case (63), and the transmission shaft (65) is arranged behind the engine (60).
The work vehicle according to claim 1, wherein (5) is interlocked and connected. The upper part of the transmission case (63) is an engine (60).
Of the transmission shaft (6) from the lower part.
3. The work vehicle according to claim 2, wherein the vehicle is extended rearward along the side of the engine above the vehicle body frame. 4. A transmission / transmission case (70) is interlockedly connected to a rear end of the transmission shaft (65), and a rear PTO shaft (71) is projected from the transmission / transmission case (70) to form the rear PTO shaft. The work vehicle according to claim 2 or 3, wherein power output from the shaft (71) can be output. 5. The front PTO shaft (64) is a vehicle body frame.
The work vehicle according to claim 2, wherein the work vehicle is arranged near the left and right virtual center line (X).