JP2964529B2 - Agricultural traveling body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a traveling vehicle body for farming, in which a working device such as a seedling planting device is mounted on a rear portion of the vehicle body to perform farming work.

[Conventional technology and its problems]

In a field or the like where agricultural work is performed, when traveling on a four-wheel drive vehicle in a place with large irregularities, it becomes difficult to travel with the four wheels driven and rotated in contact with the ground, and it is difficult to perform stable traveling. May be.

Therefore, as a four-wheel drive agricultural traveling vehicle body in which the left and right rear wheels are provided so as to be able to roll, there has been a technique in which the four wheels are always in contact with the ground so that the vehicle can travel favorably in a place with large irregularities.

In addition, in the case of an agricultural traveling body, in order to attach a heavy working device to the rear part, the vehicle weight center must be adjusted in order to improve the front-rear balance of the aircraft when the working device is attached and perform accurate work. Must be closer to the front.

Therefore, a power branching unit such as a differential device that branches power to the left and right rear wheels toward the left and right is provided in a transmission case provided on the front side of the vehicle body. , The center of gravity of the vehicle can be effectively shifted toward the front side.

However, in the configuration in which the left and right rear wheels can be rolled as described above, if the above rear wheel transmission configuration is adopted, the left and right rear wheels will roll and the left and right transmission shafts will also roll. When traveling in a paddy field with a deep mud layer, the rear side of the transmission shaft also sinks into the mud, which increases the load during traveling and increases the rotational resistance of the transmission shaft, thus increasing horsepower loss. Therefore, there was a problem that it was difficult to travel accurately in the paddy field.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a four-wheel drive agricultural traveling vehicle body in which left and right rear wheels 1 are provided so as to be able to roll, and a power branching portion for the left and right rear wheels 1 is provided on the front side of the vehicle body. A pair of left and right transmission shafts is provided from the transmission case 8 to the left and right rear wheels 1.
And a transmission shaft 38, and the transmission shaft 38 is provided so as to have a front-up posture when the left and right rear wheels 1 are at the same position in the vertical direction with respect to the body. Things.

[Functions and Effects of the Invention]

The present invention relates to a four-wheel drive agricultural traveling vehicle body in which the right and left rear wheels 1 are provided so as to be able to roll so that the four wheels are always in contact with the ground so that the vehicle can travel well on a large uneven surface. A power branching portion for the left and right rear wheels 1 is provided in a transmission case 8 provided on the front side of the vehicle body,
Since the transmission is transmitted from the transmission case 8 to the left and right rear wheels 1 via a pair of left and right transmission shafts 38, the vehicle center of gravity can be configured closer to the front side, and the front and rear of the machine when the working device is mounted on the rear of the vehicle body. A proper work can be performed with a good balance.

In addition, even though the rear wheel 1 is configured to support and transmit power as described above, the transmission shaft 38 is configured to be in a front-up posture when the left and right rear wheels 1 are at the same vertical position with respect to the body. With this arrangement, when the left and right rear wheels 1 roll and the left and right transmission shafts 38 roll, the transmission shaft 38 sinks into the mud even when traveling in a deep muddy paddy field. Part is less, so
As a result, the horsepower loss is reduced, making it easier to drive properly in paddy fields.

〔Example〕

In the illustrated example, a tractor body 12 is mainly composed of a square pipe in a central vertical direction, a handle post 13 for supporting a steering handle, a transmission case 8 and the like are mounted on a front portion thereof, and an engine 14 is mounted on a rear portion. At the rear end, a rear wheel transmission case 15 with rear wheels 1 mounted on both left and right sides
The central part of the rear wheel frame 16
The lift link 19 is provided so as to be rotatable around 17, and is vertically movable by a lift cylinder 18 which is expanded and contracted by hydraulic pressure, and a working device such as a seedling planting device is connected to a rear end of the lift link 19. It is configured to move up and down.

The transmission case 8 is provided with a side brake case portion 3 at a front portion, and a front axle housing portion 7 and a differential case portion 9 at a rear portion. The upper side of the transmission case 8 is covered with a control floor 20,
A cockpit 21 is provided above the engine 14.

Regarding the transmission configuration from the engine 14 to the transmission case 8, a transmission shaft 23 extending from an engine shaft 22 via a universal joint or the like is extended to the lateral front end position of the transmission case 8, and a transmission split pulley 24 is provided. A belt 27 is transmitted between the pulley 26 of the input shaft 25 protruding forward and the speed-change split pulley 24, so that the speed is continuously changed.

The transmission configuration of the transmission case 8 from the input shaft 25 to the front wheel 5, the rear wheel 1, and the power take-off shaft 28 to the working device, etc., is such that the differential of the front wheel 5 is transmitted from the input shaft 25 via the main transmission 29. In conjunction with the device 6 and the differential 30 of the rear wheel 1, the differential 6 is located in the differential case 9 and
The front axle 31 in the front axle housing portion 7 on both the left and right sides is configured to be differentially interlocked.
An axle 33 of the front wheel 5 is transmitted via a transmission 32. Also, differential device
Numeral 30 is for differentially interlocking the rear wheel transmission shaft 2 extending to the left and right sides, and a side brake 4 is formed in a multi-disc form at an outer end of the rear wheel transmission shaft 2, and a brake cam 34 is provided from outside. The configuration is such that the side brake 4 is braked by pressing. A gear 35 is transmitted from the rear wheel transmission shaft 2 to the rear wheel take-out shaft 10 rearward. These side brakes 4
The transmission gear 35 of the rear wheel take-out shaft 10 and the like are covered with the side brake case 3.

In such a transmission case 8, the side brake case 3, the differential case 9, the front axle housing 7, and the like may be partially formed and joined to form an integrated structure. One side of the transmission case 8 is provided so as to transmit a power take-off shaft 28 which is directed rearward from the input shaft 25 via a transmission gear 36, a power take-out clutch 37 and the like.

On both left and right sides of the differential case 9, a recess 11 is formed below the front axle housing 7 projecting outward and through which the rear wheel take-out shaft 10 passes. Wheel take-out shaft 10 and input shaft 37 of the rear wheel transmission case 15
Are connected by a transmission shaft 38 via a universal joint, an expansion joint and the like, and the rear wheels are driven. In the rear wheel transmission case 15, a gear is transmitted from the input shaft 37 to the axle 39.

Reference numeral 40 denotes a main transmission lever for operating the main transmission 29, and 41 denotes an inter-stock switching lever for operating the transmission gear 36.When a seedling is mounted, the transmission speed ratio with respect to the traveling speed of the seedling is changed. It changes the interval between seedlings. Reference numeral 42 denotes a hydraulic pump, which is transmitted from the engine shaft 22 by a belt 43, and drives a hydraulic circuit such as the lift cylinder 18.

On one side of floor 20, left and right side brake petals 44
The left and right brake cams 34 are interlocked so as to be operated, and the stepping brake is applied to the side brake 4 on the stepping side to facilitate steering turning. Also floor
On the other side of the clutch 20, a clutch petal 45 is provided. The clutch petal 45 is interlocked so as to loosen the tension pulley of the belt 27 and cut off the transmission from the transmission shaft 23 to the input shaft 25 by stepping.

From the steering shaft 46 in the steering post 13,
A pitman arm 48 is interlocked via a steering transmission 47 attached to the front end of the vehicle body, and a rod 50 is provided between the pitman arm 48 and a knuckle arm 49 for steering the axle 33 of the front wheel 5 around the kingpin. And are linked by steering. Reference numeral 51 denotes a bumper attached to the front end of the vehicle body 12.

When the engine 14 is driven, the transmission 29, the front and rear differentials 6, 30 and the like are transmitted via the transmission shaft 23, the belt 27, the input shaft 25, and the like on the transmission case 8, and the front axle 31 is transmitted from the differential 6 to the front axle 31. The front wheels 5 are driven via the vertical shaft 32, the axle 33, and the like. Also, from the differential device 30, the rear wheel transmission shaft 2, the gear 35, the rear wheel take-out shaft 10, the transmission shaft 38, the input shaft
The rear wheel 1 is driven via the axle 39 and the like. Further, the power take-off shaft 28 is transmitted via the transmission gear 36, the clutch 37, and the like, and the working device is driven.

At the time of steering and turning, the steering wheel is operated to the steered side, and when the side brake petal 44 on the steered side is depressed, the side brake 4 on the same side is braked, and the rear wheel 1 is braked to make a sharp turn. can do.

The side brake 4 may be provided with a side clutch together. In this case, when the one side brake petal 44 is depressed, the side brake 4 is braked in a state where the side clutch is disengaged.

The above-mentioned agricultural traveling vehicle is a four-wheel drive agricultural vehicle having left and right rear wheels 1 provided in a rollable manner so that the four wheels are always in contact with the ground so that the vehicle can travel favorably on a place with large irregularities. The left and right rear wheels 1
A power branching portion is provided in a transmission case 8 provided on the front side of the vehicle body, and is transmitted from the transmission case 8 to the left and right rear wheels 1 via a pair of left and right transmission shafts 38. It can be configured closer to the front side, so that the front-rear balance of the machine body when the working device is mounted on the rear portion of the vehicle body can be improved to perform an accurate work.

Moreover, while having the above-described rear wheel 1 support structure and transmission structure, as shown in FIG.
When the right and left rear wheels 1 are located at the same position in the vertical direction with respect to the body, the transmission shafts 38 are provided so as to be in a forward-upward posture, so that the left and right rear wheels 1 roll as the left and right rear wheels 1 roll. When rolling, even when traveling in a paddy field with a deep mud layer, the portion of the transmission shaft 38 that sinks into the mud is reduced, so that the horsepower loss is reduced and the It will be easy to run.

[Brief description of the drawings]

1 is a side view, FIG. 2 is a plan view, FIG. 3 is a partial rear view, FIG. 4 is a partial left side view, and FIG. The figure is a right side view, and FIG. 6 is a transmission mechanism diagram. DESCRIPTION OF SYMBOLS 1... Rear wheel 2... Rear wheel transmission shaft 3 .. side brake case 4... Side brake 5... Front wheel 6... Differential device 7... Front axle housing 8. Transmission case 9: Differential case 10: Rear wheel take-out shaft, 11: recess

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Hisashi Kamiya 1-Yakura, Tobe-cho, Iyo-gun, Ehime Pref. Inspector, Iseki Agricultural Machinery Co., Ltd. Examiner, Hiroshi Kamemaru (56) References Japanese Utility Model, Sho 55-31793 (JP, U.S.A.) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60K 17/04 B60K 17/32

Claims (1)

(57) [Claims] 1. A four-wheel drive agricultural traveling vehicle body having left and right rear wheels 1 rotatably provided therein, a power branching portion for the left and right rear wheels 1 is provided in a transmission case 8 provided on a vehicle body front side, The transmission is transmitted from the transmission case 8 to the left and right rear wheels 1 via a pair of left and right transmission shafts 38,
An agricultural traveling vehicle body, wherein the transmission shaft 38 is provided so as to be in a forward-upward posture when the right and left rear wheels 1 are at the same vertical position with respect to the body.