JPH0764201B2 - Agricultural work machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of a power transmission device in a riding agricultural work machine in which a working machine part for rice transplanting or the like is mounted on a rear part of a traveling vehicle body.

[Conventional technology]

An engine is located in the middle of the front wheel support shaft and the rear wheel support shaft, a transmission case is housed in the front part of the vehicle body that houses the transmission and the front wheel differential device, and a rear case is housed in the rear part of the vehicle body that houses the rear axle and side clutches. A riding agricultural work machine having a traveling vehicle body is in practical use.

[Problems to be Solved by the Invention] In the above-described conventional agricultural work machine, since the rear case is provided at the rear portion of the traveling vehicle body, the center of gravity is located relatively rearward, and the weight balance between the front and the rear when the work machine part is mounted. There was a problem that was worse.

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration.

That is, the riding agricultural working machine according to the present invention is a riding agricultural working machine including a pair of left and right driving front wheels and a pair of left and right driving rear wheels, and a rear wheel diff device that distributes power from the prime mover side to the left and right rear wheels. And a front wheel diff device that distributes power from the prime mover to the left and right front wheels, and the rear wheel diff device is
It is characterized in that it is provided in front of the front wheel differential device.

[Operation] Since the rear wheel diff device is disposed on the front side of the front wheel diff device, it is possible to position the center of gravity of the traveling vehicle body toward the front, and even when the working machine portion is mounted on the traveling vehicle body, Good weight balance.

[Embodiment] FIG. 1 to FIG. 3 show a riding rice transplanter which is an embodiment of a riding agricultural work machine according to the present invention. This rice transplanter 1 is provided with a link device 3 provided at a rear portion of a traveling vehicle body 2. The working machine part 4 for rice transplanting is attached.

The traveling vehicle body 2 includes a vertical pipe 6 in the front-rear direction that passes through the center of the left and right.
And a horizontal pipe 7 which is orthogonal to these at the rear end of the vertical pipe.
And form a T-shaped frame, and the engine 10, mission case 11, front wheel differential case (front differential case) 12, rear wheel differential case (rear differential case) on the vertical pipe 6.
13 and the like, and rear wheel support cases 15 and 15 are provided at both left and right ends of the horizontal pipe 7.

The engine 10 is installed on an engine base 16 provided at a position near the rear of the vertical pipe, and the engine output is an engine output shaft 17 protruding forward from the engine and an extension shaft thereof.
It is transmitted to Mission Case 11 via 18.

The rotary power input to the mission case 11 is appropriately shifted by the continuously variable transmission (HST) 20, the main transmission 21, the inter-stock auxiliary transmission 22 and the inter-stock transmission 23, which can be switched between forward and reverse,
It is taken out as a front wheel drive output, a rear wheel drive output, and a working unit drive output. Front wheel drive output is in mission case 11
It is transmitted to the front wheel differential device (front differential device) 24 in the front differential case 12 provided at the rear part. Left and right front axle cases 2 on both sides of the front differential case 12.
5, 25 are integrally provided, and front wheel support cases 26, 26 are vertically movably provided at the ends of the front axle case, and front wheels 27, 27 are pivotally supported at the lower ends thereof. By the action of the front differential device 22, the front wheel drive output is transmitted to the left and right front wheels 27, 27 according to the respective rotational resistances. The rear wheel drive output is transmitted to a rear wheel diff device (rear diff device) 30 provided in the front of the transmission case 11.
Rear wheel drive shafts 31, 31 are projected rearward from both side surfaces of the rear differential case 13, and the rear end portions of the rear wheel drive shafts are inserted into the rear wheel support cases 15, 15. Brake devices 30a, 30a for braking the rear wheels are provided in the middle of transmission from the rear wheel differential device 30 to the left and right rear wheel drive shafts 31, 31. Left and right rear wheels 32, 32 are pivotally supported by the rear wheel support cases 15, 15. As in the case of the front wheels, the rear differential device 30 causes the rear wheel drive output to be transmitted to the left and right rear wheels 32, 32 according to the respective rotational resistances. A side clutch device may be provided instead of the rear wheel differential device 30. Further, the work unit drive output is transmitted from the rear portion of the vehicle body through the PT0 shaft 34 to the work unit portion 4.

A body 40 is placed over these chassis. Then, the cockpit 42 is installed on the engine room 41 in which the engine 10 and the like are stored, and the steering wheel 45, various levers, and instruments are attached to the upper end of the steering post cover 44 protruding upward from the front end of the vehicle body. Has been. The floor 47 is provided with operation pedals such as a brake pedal 48.

In the link device 3, an upper link 51 and a lower link 52 are rotatably supported by a supporting frame 50 fixed on the horizontal pipe 7, and a connecting frame 54 is attached to rear end portions of these upper and lower links. There is. Then, the working machine portion is mounted on the connecting frame 54 in a rollable manner. A hydraulic cylinder 57, which is a driving means of the link device 3, has a base side pivotally attached to the back surface of the engine base 16, and a piston rod 57a is connected to a tip portion of an arm 58 integral with the upper link 51. This hydraulic cylinder
When the telescopic frame 57 is expanded and contracted, the connecting frame 54 is moved up and down while being held in a substantially fixed posture.
Can be raised and lowered.

The work implement part 4 is a transmission case 60 that is transmitted from the PTO shaft 34.
And a seedling mounting table 61 that is inclined in front of the transmission case so that the front side is in a higher position, and two pairs of planting rods 62 per row ,. While 61 reciprocates left and right to supply seedlings on the table to the specified seedling take-out port one by one, the planting rod 62 moves up and down while drawing a predetermined trajectory and is supplied to the seedling take-out port. The seedlings are held by the planting claws 62a provided at the tip of the planting rod and planted in the field. When the seedling placing table 61 reaches the end of the left and right stroke and finishes supplying one horizontal row of seedlings to the seedling take-out port, the belt type seedling feeding device 64 operates to move the seedling downward by one row. Transfer to.

Further, on the back side (front side) of the seedling placing table 61, fertilizer applying devices 70, ... Are provided along the seedling placing table. The fertilizer applicator 70
A fertilizer tank 71 consisting of a hopper-shaped accommodating portion 71a and a tubular accommodating portion 71b extending downward from the lower portion, a feeding machine 72 for feeding the fertilizer in the fertilizer tank downward, and a funnel provided directly below the feeding machine. 73 and a fertilization pipe 74 for guiding the fertilizer supplied to the funnel into the fertilization groove of the field scene formed by the later-described grooving device 84.

Below the transmission case 60, a center float 80 that supports these main parts on the paddy field and a pair of left and right side floats 8
1,81 are rotatably pivoted up and down. The connecting frame 54
A hydraulic valve 82 of a hydraulic cylinder 57 is hung from the bottom of the valve, and the valve 82 is driven by the vertical movement of the front end of the center float 80. When the float moves upward, the hydraulic valve 82 is driven in the direction in which the hydraulic cylinder 57 is extended, and the working machine part 4 moves up. Further, when the float moves downward, the valve 82 is driven in the direction of contracting the hydraulic cylinder 57, and the working machine part 4 descends. Groovers 84, ... Which form fertilizing grooves in the field are attached to each float in correspondence with the planting position.

In this rice transplanter 1, the engine 10 is installed in the intermediate portion between the front wheel support shaft 27a and the rear wheel support shaft 32a, and the front wheel support shaft 27a
A mission case 11 is provided at a position slightly forward of 27a, a front wheel differential case 12 is provided near the rear portion of the mission case, and a rear wheel differential case 13 is provided near the front portion. In this arrangement, a rear wheel diff case 13 is provided in front of the mission case 11, and the rear wheel diff case 13 to the rear wheel support case 1 via rear wheel drive shafts 31, 31 passing through both sides of the vehicle body.
It is possible by configuring to transmit to 5,15. In this way, since the relatively heavy mission case and differential case are gathered and arranged in the front part of the vehicle body, when the heavy work implement part 4 including the fertilizer application device 70 is attached as shown in the illustrated example. However, the center of gravity does not move backward more than necessary, and the weight balance between the front and the rear can always be properly maintained. Further, since the front axle and the rear axle are located in the vicinity of the brake pedal 48, a member for operating and connecting the brake pedal 48 and the brake devices of both axles, for example, an operation wire or the like is not required, and the brake operating parts are not required. The number is small and the structure is simple.

[Advantages of the Invention] As described above, the riding agricultural work machine according to the present invention includes the rear wheel diff device that distributes the power from the prime mover to the left and right rear wheels, and the power from the prime mover to the left and right front wheels. The front wheel differential device for distributing the rear wheel differential device is provided on the front side of the front wheel differential device, so that the center of gravity is relatively located in the front part of the traveling vehicle body and the heavy work machine part is mounted. Even in this case, the weight balance between the front and the rear was good, and smooth running became possible.

[Brief description of drawings]

FIG. 1 is a side view of a riding rice transplanter, which is an example of the present invention, and FIG.
The drawing is a plan view of the power transmission device, and FIG. 3 is a transmission system diagram. 1 ... Passenger rice transplanter, 2 ... Running car body, 3 ... Link device, 4 ... Working machine part, 10 ... Engine, 11 ... Mission case, 12 ... Front wheel differential case, 13 ... Rear wheel differential case, 25 …… Front axle case, 27 …… Front wheel, 31
…… Rear wheel transmission shaft, 32 …… Rear wheel.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seike Rihaku No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Pref.Iseki Agricultural Machinery Co., Ltd. Technical department

Claims (1)

[Claims] Claims: 1. In a riding agricultural work machine comprising a pair of left and right drive front wheels and a pair of left and right drive rear wheels, a rear wheel differential device for distributing power from the prime mover side to the left and right rear wheels, and a prime mover side drive device. A front agricultural diffractor for distributing power to left and right front wheels, wherein the rear diff device is provided in front of the front diff device.