JP2001251907A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure good workability and safety of a working vehicle. SOLUTION: A vehicle frame is placed between a pair of right and left crawler driving parts, a driver's seat is positioned on the front part of the frame, an engine is placed at the back of the driver's seat, a transmission interlocked with the engine is placed under the seat, the driving wheels of both driving parts are connected to the transmission through respective drive transmission mechanisms, a front PTO shaft protruding forward is connected to the transmission and a rear PTO shaft protruding backward is connected to the transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle.

[0002]

2. Description of the Related Art Conventionally, as one form of a working vehicle, a driving unit is provided at a front portion of a body frame, a motor unit and a transmission unit are provided at a rear portion, and a working device is provided at a rear end of the body frame. Are connected so that a desired operation can be performed while towing the operation device.

[0003]

However, in the above-described working vehicle, the prime mover unit and the transmission unit are disposed at the rear of the vehicle body, and the working device is connected to the rear thereof. Will be located closer to the rear,
As a result, when the work device is operated to perform work, the front part of the vehicle body may be lifted, and good workability and safety may not be ensured.

[0004]

Accordingly, in the present invention, a vehicle body frame is provided between a pair of right and left crawler traveling parts, and a driving part is disposed at a front part on the vehicle body frame. A prime mover section is arranged behind the seat, and a transmission section linked to the prime mover section is arranged below the seat, and the drive wheels of each traveling section are linked to the transmission section via a traveling transmission mechanism. The present invention also provides a work vehicle in which a front PTO shaft projecting forward is interlockingly connected to the transmission section, and a rear PTO shaft projecting rearward is interlockingly connected to the transmission section.

[0005] The present invention is also characterized by the following configuration.

The traveling section includes a traveling frame extending in the front-rear direction, front and rear driven wheels attached to the front and rear ends of the traveling frame, and a position between the front and rear driven wheels and above them. And a crawler belt wound between the driving wheel and the front and rear driven wheels, and the front and rear driven wheels can be interchangeably attached to the front and rear ends of the traveling frame. At the same time, when mounted on the same traveling frame, the ground clearances are different from each other.

[0007] The traveling transmission mechanism includes a chain as transmission means.

[0008] The traveling transmission mechanism includes a drive shaft as transmission means.

[0009]

Embodiments of the present invention will be described below.

That is, in the working vehicle according to the present invention, a vehicle body frame is provided between a pair of left and right crawler traveling parts, and an operating part is disposed at a front part on the vehicle body frame, and a seat of the driving part is provided. A prime mover section is arranged at the rear, and a transmission section interlocked with the prime mover section is arranged below the seat, and drive wheels of each traveling section are coupled to the transmission section via a traveling transmission mechanism, respectively, and , While the front PTO shaft projecting forward is linked to the transmission section,
A rear PTO shaft projecting rearward is linked to the transmission section.

In this way, while the driving section and the transmission section are arranged at the front of the vehicle body and the prime mover section is arranged at the rear section of the vehicle body, when the operator sits on the seat of the driving section, Good balance between the center of gravity in the front and rear, and good workability and safety can be ensured.

In addition, the transmission section has a front PT.
Since the O-shaft and the rear PTO shaft are linked to each other, the working device can be linked to the front or rear of the vehicle body frame as appropriate, so that work can be performed efficiently.

[0013] The traveling portion includes a traveling frame extending in the front-rear direction, front and rear driven wheels attached to front and rear ends of the traveling frame, and a portion between and between the front and rear driven wheels. Equipped with drive wheels arranged in the upper position and crawler belts wound between these drive wheels and front and rear driven wheels, front and rear driven wheels can be interchanged with the front and rear ends of the traveling frame When the vehicle is mounted on the traveling frame, the ground clearances are different from each other.

In this way, for example, when mainly traveling forward (reverse traveling), the front driven wheel (rear driven wheel)
The ground height of the rear driven wheels (front driven wheels) is set higher than the ground height of the rear driven wheels, so that the bumps on the stepped ground can be smoothly run and run, resulting in running performance and work performance. Can be improved.

Since the traveling transmission mechanism has a chain as a transmission means, the chain can reliably transmit power from the transmission to the driving wheels, thereby ensuring good traveling drivability. .

Further, the traveling transmission mechanism may include a drive shaft as transmission means.

In this manner, power can be reliably transmitted from the transmission section to the drive wheels by the drive shaft, and the drive shaft can be compactly arranged.

[0018]

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

A shown in FIGS. 1 to 3 is a first embodiment according to the present invention.
The working vehicle A is an example of the working vehicle. The working vehicle A has a tillage device B as a working device connected rearward through a lifting / lowering connecting mechanism C.

In the working vehicle A, a body frame 2 is provided between a pair of left and right crawler traveling parts 1 and 1, and an operation part 3 is disposed on the front part of the body frame 2 so that the operation part 3 The motor unit 5 is arranged behind the seat 4 of the vehicle 3, and the transmission unit 6 interlocked with the motor unit 5 is disposed below the seat 4, and the driving wheels of the traveling units 1 and 1 are arranged on the transmission unit 6. 1
3, 13 are interlocked and connected via the traveling transmission mechanisms 7, 7, respectively.
And a front PT projecting forward in the transmission section 6.
While the O-shaft 8 is interlockingly connected, a rear PTO shaft 9 projecting rearward to the transmission portion 6 is interlockingly connected.

The traveling section 1 includes a traveling frame 10 extending in the front-rear direction, front and rear driven wheels 11, 12 attached to the front and rear ends of the traveling frame 10, respectively, and both front and rear driven wheels 11, 12. A drive wheel 13 is disposed between and above the drive wheels 12, and a crawler belt 14 is wound between the drive wheel 13 and the front and rear driven wheels 11, 12.

In addition, the front and rear driven wheels 11 and 12 are provided at the front and rear ends of the traveling frame 10 respectively.
Installed via 5,16, each idler hawk 15,16
The base ends are inserted into the front and rear ends of the traveling frame 10 so that they can be freely inserted and removed, and can be exchanged with each other, and the ground heights are different from each other when attached to the traveling frame 10. . 17 is an idler fork advance / retreat adjusting bolt, 18 is a rolling wheel, and 19 is a crawler slip prevention body.

In the body frame 2, a front horizontal frame forming piece 20, an intermediate horizontal frame forming piece 21 and a rear horizontal frame forming piece 22 are spaced apart in the front-rear direction between a pair of left and right running frames 10, 10. The front support member 23 is formed so as to be horizontally suspended, and is raised above the front horizontal frame forming piece 20.
A guard frame 25 formed in a quadrangular ring shape in a plan view is provided between the rear support member 24 and the rear support member 24 raised above the rear horizontal frame forming piece 22.

The operating section 3 has a floor (not shown) extending from the front of the guard frame 25, a handle column 26 standing upright at the front of the floor, and an upper end of the handle column 26. The steering wheel 27 is attached to the steering wheel 27, and the seat 4 is arranged at a position behind the steering wheel 27.

The engine unit 5 includes an engine 28 and the engine 28
A radiator, an air cleaner, and the like (not shown) are provided near 28.

As shown in FIG. 2, the transmission section 6 has a left-right extension case 31 extending the transmission case 30 in the left-right direction, and a front end communicating with the right end of the left-right extension case 31. A hydrostatic continuously variable transmission (hereinafter referred to as "straight forward HST") 33 and a hydrostatic continuously variable transmission for turning are formed on the right side wall of the rear distractable case 32 and formed from a rearward distraction case 32 extending rearward. A device (hereinafter referred to as “turning HST”) 34 is connected in an interlocked manner.

As shown in FIG. 3, in the lateral extension case 31, an input shaft 35 and a rear output shaft 36, which are mounted parallel to each other with their axes oriented in the front-rear direction, are interlocked via a counter shaft 37. Connected. 83 is the engine output shaft, 84
Is a transmission transmission shaft interposed between the engine-side output shaft 83 and the input shaft 35.

Moreover, the output gear 38 attached to the input shaft 35
And the input gear 39 attached to the counter shaft 37
An output gear 40 for reduction and an output gear 41 for speed increase attached to the counter shaft 37 are meshed with an input gear 42 for reduction and an input gear 43 for speed increase, which are rotatably mounted on the rear output shaft 36, respectively. A shift operation slider 44 is interposed between the two gears 42 and 43, and the rear output shaft 36 can be switched between high speed and low speed by operating the speed change slider 44.

In the rearward extension case 32, an input shaft 33a of the straight HST 33 is connected to the input shaft 35 via a first output shaft 45, and a pair of left and right drive shafts are connected to the output shaft 33b of the straight HST 33. The shafts 46, 46 are interlocked and connected via a sub-transmission mechanism 47 for traveling straight.
The pair of left and right drive shafts 46, 46 are interlockingly connected to the output shaft 34b of the turning HST 34 via a turning auxiliary transmission mechanism 50 and a reverse rotation mechanism 51.

The first output shaft 45 is formed so as to extend in the left-right direction, and has one side end linked to the input shaft 35 via bevel gears 52 and 53.

The pair of left and right drive shafts 46, 46 are formed to extend in the left-right direction on the same axis, and a cylindrical sun gear 54 is fitted on the outer periphery of the butted inner ends. A large-diameter input gear 55 is attached to the outer periphery of the central part of the 54, and the left and right sides of the sun gear 54 and the drive shafts on the left and right sides
Left and right planetary gear mechanisms 56, 56 are formed between the inner ends of the 46, 46. 56a is a planet gear, 56b is a ring gear, 56c
Is a cage.

The straight-moving sub-transmission mechanism 47 includes a straight-moving sub-variable side shaft 57.
A reduction gear 59 and a speed increasing gear 60, which are horizontally traversed in parallel with each other with the straight axis of the counter shaft 58 oriented in the left-right direction, The output gear 61 for reduction and the output gear 62 for speed increase attached to the counter shaft 58 for straight running are meshed with each other, and a slider 63 for speed change operation is interposed between the gears 59 and 60 to perform the same speed change operation. By operating the slider 63 for the high speed and the low speed, it is possible to perform the sub-speed for straight traveling in two stages. Reference numeral 64 denotes a small-diameter output gear meshed with the large-diameter input gear 55 and attached to the straight traveling counter shaft 58. Reference numeral 82 denotes a stopping brake unit attached to the straight traveling counter shaft 58.

The chain interlocking mechanism 49 is formed by winding an interlocking chain 67 between a first sprocket 65 attached to the first output shaft 45 and a second sprocket 66 attached to the second output shaft 48. .

The turning auxiliary transmission mechanism 50 includes a turning auxiliary variable side shaft 68.
And the turning counter shaft 69 are traversed in parallel to each other with their axes oriented in the left and right direction, and the reduction gear 70 and the speed increasing gear 71, which are rotatably mounted on the turning auxiliary variable side shaft 68, respectively, are turned. And a speed-reducing output gear 72 and a speed-increasing output gear 73 attached to the counter shaft 69, respectively. By operating the slider 74, a high-speed and low-speed two-stage turning auxiliary speed change can be performed. 75 is the counter shaft for turning 69
Small-diameter output gear attached to

The reverse rotation mechanism 51 includes a first reverse rotation shaft 76 and a second reverse rotation shaft.
77, and a large-diameter reverse gear 78 that meshes with the small-diameter output gear 75 is attached to the central portion of the first reverse shaft 76,
A small-diameter reverse gear 79 meshing with the ring gear 56b of the left planetary gear mechanism 56 is attached to the left side of the first reverse shaft 76,
A small-diameter reverse gear 81 that meshes with the ring gear 56b of the right planetary gear mechanism 56 via a counter gear 80 mounted on the second reverse shaft 77 is mounted on the right side of the first reverse shaft 76.

The traveling transmission mechanism 7 is provided on the outer end of a drive shaft case 90 formed to extend outward from the side wall of the rearward extension case 32 so as to surround the outer end of the drive shaft 46. Connect the front end of the traveling transmission case 91 to extend,
At the rear end of the traveling transmission case 91, the drive wheel 13 is mounted on the drive wheel support shaft 92.
And in the traveling transmission case 91,
Output sprocket 93 attached to the outer end of drive shaft 46
A chain 95 is wound as a transmission means between the driving wheel supporting shaft 92 and an input sprocket 94 attached to the inner end of the driving wheel supporting shaft 92. 99 is a drive wheel support shaft case.

The front PTO shaft 8 protrudes forward from the laterally extending case 31 of the transmission section 6 via the deceleration case 102.
Power can be taken out to a snow removal device D (see FIG. 5) connected to the front of the vehicle.

The rear PTO shaft 9 projects rearward from the right side of a reduction case 96 disposed at the rear of the body frame 2, and the rear input shaft 97 extends forward from the left side of the reduction case 96. And a rear transmission shaft 98 is interposed between the rear input shaft 97 and the rear output shaft 36 to thereby provide the rear output shaft 36 → the rear transmission shaft 98 → the rear input shaft 97 → the reduction case 96. → Power is transmitted to the rear PTO shaft 9 so that the power can be taken out from the rear PTO shaft 9 to the tilling device B connected to the rear of the work vehicle A.

FIG. 4 shows a modification of the working mode of the working vehicle A as the first embodiment described above.
Then, the snow removing device D as a working device is connected to the connecting mechanism E in the front.
Are interlocked and linked.

A front transmission shaft 101 is interposed between the input shaft 100 protruding rearward from the snow removing device D and the front PTO shaft 8 of the work vehicle A, and the front PTO
Power is transmitted from the shaft 8 → the front transmission shaft 101 → the input shaft 100 so that the snow removal device D can be driven. 114 is a snow removal device operation lever.

The traveling unit 1 of the working vehicle A as a modification example
1 is a front driven wheel 11 and a rear driven wheel 12 of the work vehicle A of the first embodiment.
Are replaced via the front and rear idler forks 15 and 16 so that the ground clearance of the front driven wheel 11 is lower than the ground clearance of the rear driven wheel 12.

In this manner, the ground contact length of the crawler belt 14 can be extended to the front side even though the center of gravity of the work vehicle A to which the snow removal device D is connected to the front is closer to the front side. The running and working stability of A can be ensured satisfactorily.

FIG. 5 shows a working vehicle A according to a second embodiment. The working vehicle A has the same basic structure as the working vehicle A according to the first embodiment described above. It differs in the transmission structure from the part 6 to the drive wheels 13.

That is, while a pair of left and right drive shafts 46, 46 is projected rearward from the transmission section 6, a pair of left and right drive wheel reduction cases 110, 110 are disposed at the rear of the body frame 2, and each drive wheel reduction case is provided. Drive wheel support shafts 92, 92 that support the drive wheels 13, 13 from the 110, 110 are protruded outward, and bevel gear cases 111, 111 are interlocked and connected to the inside of each drive wheel reduction case 110, 110, and each bevel gear case 11
The input shafts 112, 112 protrude forward from 1,111, and the input shafts 112, 112 and the above-described drive shafts 46, 46 are interlockingly connected via drive shafts 113, 113 as transmission means.

[0045]

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

According to the first aspect of the present invention, a vehicle body frame is provided between a pair of left and right crawler traveling parts, and a driving part is disposed at a front part on the vehicle body frame, and a rear part of a seat of the driving part is provided. In addition to disposing the prime mover section, a transmission section interlocked with the prime mover section is disposed below the seat, and the drive wheels of each traveling section are coupled to the transmission section via the traveling transmission mechanism, respectively, and A front PTO shaft projecting forward is interlockedly connected to the transmission unit, and a rear PTO shaft projecting rearward is interlockedly connected to the transmission unit.

As described above, while the driving section and the transmission section are arranged at the front of the vehicle body and the prime mover section is arranged at the rear section of the vehicle body, when the operator is seated on the seat of the driving section, the operation of the vehicle body is prevented. Good balance between the center of gravity in the front and rear, and good workability and safety can be ensured.

Further, the transmission section includes a front PT.
Since the O-shaft and the rear PTO shaft are linked to each other, the working device can be linked to the front or rear of the vehicle body frame as appropriate, so that work can be performed efficiently.

According to the second aspect of the present invention, the traveling portion is
A traveling frame extending in the front-rear direction, front and rear driven wheels attached to the front and rear ends of the traveling frame, and driving wheels disposed between the front and rear driven wheels and at a position higher than these, It is provided with a crawler belt wound between these drive wheels and front and rear driven wheels, and the front and rear driven wheels are provided in front of and behind the traveling frame.
At the rear end, they can be replaced with each other, and when mounted on the same traveling frame, the ground clearances are different from each other.

In this way, for example, when mainly traveling forward (reverse traveling), the front driven wheel (rear driven wheel)
The ground height of the rear driven wheel (front driven wheel) is set higher than the ground height of the rear driven wheel, so that the bumps on the stepped ground can be smoothly run and run, resulting in running performance and work performance. Can be improved.

According to the third aspect of the present invention, since the traveling transmission mechanism includes the chain as the transmission means, the power can be reliably transmitted from the transmission to the driving wheels by the chain, and the traveling drive mechanism can be driven. Good property can be ensured.

According to the fourth aspect of the present invention, the traveling transmission mechanism may include a drive shaft as transmission means.

In this way, power can be reliably transmitted from the transmission to the drive wheels by the drive shaft, and the drive shaft can be compactly arranged.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a transmission unit of the work vehicle.

FIG. 3 is a cross-sectional plan view of the transmission unit.

FIG. 4 is a side view of a working vehicle as a modified example.

FIG. 5 is a side view of a working vehicle as a second embodiment.

[Explanation of symbols]

 A Work vehicle 1 Running unit 2 Body frame 3 Operating unit 4 Seat 5 Engine unit 6 Transmission unit 7 Traveling transmission mechanism

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiichi Tamura 428 Enami, Onami, Okayama Pref.Seirei Industry Co., Ltd. (72) Inventor Yoshikazu Hiroshige 428 Enami, Okayama City, Okayama Pref. (Reference) 2B041 AA17 AB05 AC03 AC20 EA02 EA03 EA14 EA22 3D043 AA01 AA10 AB07 AB10 BA04 BA06 BC05 EA02

Claims (4)

[Claims] 1. A vehicle body frame (2) is erected between a pair of left and right crawler-type traveling parts (1, 1), and an operating part (3) is arranged at a front part on the vehicle body frame (2). Driving department (3) seats
The engine unit (5) is located behind (4) and the seat (4)
A transmission section (6) interlocked with the prime mover section (5) is arranged below the motor section, and the transmission section (6) has a drive wheel (1
3 and 13) are interlocked with each other via a traveling transmission mechanism (7, 7), and a front PTO shaft (8) projecting forward is interlocked with the transmission section (6), while the transmission section (7 6)
A working vehicle characterized by interlockingly connecting a rear PTO shaft (9) projecting rearward. 2. A traveling section (1) comprising: a traveling frame (10) extending in the front-rear direction; and front and rear driven wheels (11, 12) attached to front and rear ends of the traveling frame (10), respectively. A drive wheel (13) disposed between and above the front and rear driven wheels (11, 12), and the drive wheel (13) and the front and rear driven wheels (11, 12).
And a crawler belt (14) wound between the front and rear driven wheels (11, 12). Traveling frame
The work vehicle according to claim 1, wherein the ground height is different from each other when the vehicle is attached to (10). 3. The work vehicle according to claim 1, wherein the traveling transmission mechanism (7) includes a chain (95) as transmission means. 4. The travel transmission mechanism includes a drive shaft (113) as transmission means.
The working vehicle described.