JP2979577B2 - Traveling vehicle body of a riding type agricultural work machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to an agricultural traveling vehicle body to which an agricultural working machine such as a rice planting apparatus or a seeding apparatus is mounted and which travels in a field such as a paddy field with soft soil.

[Conventional technology]

Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 60-244213, a steering front wheel driven and rotated is fixed to the body so as not to be vertically movable, and non-steering left and right rear wheels driven and rotated are mounted on the body. There has been an agricultural traveling vehicle body that is supported so as to be rotatable up and down around a rolling axis whose axis is oriented in the front-rear direction. The agricultural traveling vehicle body of this configuration is configured to always maintain the four-wheel grounding state even if there are irregularities on the grounding surface of the wheels, to have a good straight running property, and to move the front wheel for steering up and down. Sometimes the steering system must also be able to cope with the vertical movement, but by using the configuration in which the left and right non-steering rear wheels are moved up and down as described above, the structure is simplified without the necessity. There are advantages.

[Problems to be solved by the invention]

However, in the above-described conventional vehicle, a rolling shaft is disposed below a rear portion of a vehicle body frame extending in the longitudinal direction of the fuselage, and a gear case portion provided with a rear wheel axle is connected above a frame portion connecting left and right. Therefore, the frame portion connecting the left and right gear case portions of the rear wheel is arranged below the body frame. Therefore, in the above-mentioned conventional vehicle, because of such a configuration, when traveling in a place where the wheels are deeply immersed in the soil, the frame portion connecting the left and right gear case portions of the rear wheel is easily immersed in the soil,
Therefore, running resistance may increase and running may be difficult. In addition, if the frame part is arranged at a high position so as not to be easily immersed in the soil, the body frame is also arranged high, and as a result, the vehicle height becomes high, when entering and exiting the field or when loading and unloading on the carrier. Such as when the body leans, it becomes easy to fall.

Then, this invention aims at solving the above-mentioned subject in the above-mentioned conventional agricultural running body.

[Means for solving the problem]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, the present invention fixes steering front wheels 13 that are driven and rotated so as to be immovable up and down with respect to the fuselage, and drives and rotates non-steering left and right rear wheels 8.8. In an agricultural traveling vehicle body, which is rotatably supported up and down around a rolling shaft 25 whose axis is oriented in the vehicle longitudinal direction, the rolling shaft 25 is a rear portion of the vehicle body frame 4 extending in the vehicle longitudinal direction. A rear wheel gear case 23, which is disposed below the upper end and above the lower end and provided with an axle for the rear wheels 8.8, is rotatably connected to an upper and lower middle portion of a rear wheel frame 24 connecting left and right. An agricultural traveling vehicle body characterized by this.

[Functions and Effects of the Invention]

The agricultural traveling vehicle body according to the present invention has the steering front wheels 13, 13 which are driven and rotated, fixed so as not to be able to move up and down with respect to the body, and the non-steered left and right rear wheels 8.8 which are driven and rotated with respect to the body longitudinal direction. The structure is supported so that it can rotate up and down around the rolling shaft 25 where the shaft center is oriented, so that even if there are irregularities on the grounding surface of the wheel, the four-wheel grounding state will always be maintained, and straight traveling performance will be good ,
Further, when the steering front wheel is configured to move up and down, the steering system must also be configured to be able to cope with the up and down movement. However, this configuration eliminates the need and simplifies the configuration.

The rolling shaft 25 is located at the rear of the body frame 4 extending in the front-rear direction of the body, below the upper end of the body frame 4 and above the lower end thereof, and a rear wheel gear case for providing the axles of the rear wheels 8. 23 and 23 are rotatably connected to the upper and lower middle part of the rear wheel frame 24 connecting left and right, so that the body frame 4 does not become high and the rear wheel frame 24 does not become low Becomes
Therefore, it is possible to reduce the difficulty of traveling when traveling on a place where the wheels are deeply immersed in the soil without increasing the vehicle height.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

This is an example in which the riding type fertilizer rice transplanter is applied to a traveling vehicle body.

Reference numeral 1 denotes a riding type traveling body, which is connected to a seedling planting machine 3 via a link 2 at the rear.

Reference numeral 4 denotes a vehicle body frame, which is mainly composed of vertical frames 4a, 4a made of two steel prisms arranged in the traveling direction and a front horizontal frame 4b connecting the front ends thereof.
It consists of a rear horizontal frame 4c connecting the rear ends.

A steering transmission 6 for transmitting a steering operation of the steering handle 5 is provided on the front side of the frame 4, and an HST unit 7 and a rear wheel 8 of a continuously variable transmission mechanism are provided behind the steering transmission 6.
The rear differential case 11 which houses the differential device 9 for 8 and the braking devices 10 and 10 is disposed vertically, and the transmission case 12 where the HST unit 7 and the rear differential case 11 are integrally connected on the rear side is disposed. Have been. Further, a front differential case 15 in which a differential device 14 for the front wheels 13, 13 is internally connected to a rear side of the transmission case 12. A hydraulic pump 16 is provided behind the front differential case 15, and an engine 17 is mounted behind the hydraulic pump 16.

The rotational power of the engine 17 is transmitted to the HST unit 9 via the clutch 18. On the other hand, power is transmitted to the hydraulic pump 18 by a transmission belt. The output rotational power of the HST unit 9 is input into the transmission case 12. Transmission to the front wheels 13, 13 is transmitted via a front wheel differential 14. The transmission to the rear wheels 6, 6 is performed by a rear wheel drive shaft 1 protruding rearward on both left and right sides via a rear wheel differential device 9.
9 and 19, and the universal joints 20, 20, 2
Rear wheel gear case in which rear wheel transmission shafts 22, 22 having expansion joints 21, 21 and 0, 20 are connected to each other, and rear wheels 8, 8 are mounted on the shaft.
23, 23 is transmitted.

Reference numeral 24 denotes a rear wheel frame, which is a central portion of a rear lateral frame 4c of the body frame 4, and is rotatably mounted on a rolling shaft 25 fixed rearward (the axis direction and the body traveling direction are parallel). I have. The rear wheel frame 24 has both ends extending laterally to a position outside the link 2 in a plan view, and is bent rearward. A pair of rear wheel gear cases 23, 23 supporting the rear wheels 8, 8 are fixed to the outside of both ends extending rearward.

The rear wheel frame 24 is made of a rubber damper 25.
Rolling is regulated by a and 25a. Dampers 25a, 25a
Are supported by links 2c, 2c by support plates 25b, 25b, and restricting plates 25c, 25c for restricting the rolling amount θ are sandwiched between the dampers.

The link 2 includes an upper link 2a, a lower link 2b, a machine body-side link base 2c, and a work machine-side link base 2d.
The fuselage side link base 2c is erected at the rear end of the fuselage frame 4,
It is fixed. The work machine-side link base 2d is connected to the planting transmission case 19 in a freely rolling manner. An elevating arm 2e is fixed to the body side of the upper link 2a, and the distal end side of the piston rod of the hydraulic cylinder 2f is connected to the arm 2e. The hydraulic cylinder 2f has a base side fixed to the body frame 4 below the engine 13 in a horizontal frame 4a.
When the hydraulic cylinder 2f, whose base is pivotally mounted, is operated and the piston rod projects, the arm 2e rotates and the upper link 2a rotates upward.

Reference numeral 25 denotes a step floor, which is provided so as to cover the upper side of each of the power transmission devices on the body frame 4 described above. The floor 25 is integrally connected to an engine cover 26 that covers the upper side of the engine 17. Further, a seat 27 is provided above the engine cover 26.

28 is a transplanting device, and 29 is a seedling mounting table. Each of them is equipped with 6 rows of seedlings, and the seedling mount 29 is a table wide enough to hold 6 rows of seedlings, and the transplanting device 17 is equipped with 6 machines corresponding to 6 rows of seedings. Have been. The seedling mounting table 29 reciprocates left and right by a left-right reciprocating mechanism in the planting transmission case 30, and supplies the seedlings mounted on the seedling mounting table 29 to the transplanting device 28. The transplanting device 28 separates and holds one plant at a time from the seedling mounting table 29 while planting it in a field while the tip planting part draws an elliptical locus. In transmission of power to the planting transmission case 30, power is transmitted from the transmission 12 on the fuselage side to the planting transmission case 19 by the transmission shaft 30a.

Reference numeral 31 denotes a leveling float, which is attached so as to be suspended below the planting transmission case 19, and slides while the lower surface of the float is leveled flat on the mud surface of the field. 32 is a fertilizer application device, a fertilizer tank 33, a fertilizer feeding device 34, and a fertilizer hose 3
5. It is composed of a groove generator 36, an air blower 37, an air tank 38 and the like. An air tank 38 is supported and fixed from the upper end of the link base 2a on the vehicle body 1 side of the link 2 on the rear side of the seat 27, and the fertilizer feeding device 23 is mounted on the air tank 38.
And a fertilizer tank 33 above the feeding device 34.
Is installed. The air tank 38 also serves as one component of a support member of the fertilizer application device 32.

Therefore, in this agricultural traveling vehicle body, a rolling shaft 25 is fixedly mounted on the rear end portion of the vehicle body frame 4 so that the axis of the rolling shaft 25 and the traveling direction of the body are parallel to each other. A rear wheel frame 24 is movably attached to the rear wheel frame 24. Right and left ends of the rear wheel frame 24 are bent rearward, and a pair of rear wheels supporting the rear wheels 8, 8 are provided outside of both ends extending rearward. Since the gear cases 23, 23 are fixed, the rear wheels 8, 8
When rolling, the rear wheel frame 24 and the link 2 are disposed at positions where they do not come into contact with each other, without lowering the vertical position of the rear wheel frame 24 and raising the position of the rotation fulcrum of the link 2. It became possible to arrange without. Therefore, it is possible to secure a space above the link while maintaining a desired clearance to the ground of the vehicle body.

Also, in this agricultural traveling vehicle body, the front and rear steering wheels 13 and 13 that are driven and rotated are fixed to the body so that they cannot move up and down, and the left and right rear wheels 8 and 8 that are driven and rotated are driven in the longitudinal direction of the body. The structure is supported so that it can rotate up and down around the rolling shaft 25 where the shaft center is oriented, so that even if there are irregularities on the grounding surface of the wheel, the four-wheel grounding state will always be maintained, and straight traveling performance will be good ,
Further, when the steering front wheel is configured to move up and down, the steering system must also be configured to be able to cope with the up and down movement. However, this configuration eliminates the need and simplifies the configuration.

The rolling shaft 25 is located at the rear of the body frame 4 extending in the front-rear direction of the body, below the upper end of the body frame 4 and above the lower end thereof, and a rear wheel gear case for providing the axles of the rear wheels 8. 23 and 23 are rotatably connected to the upper and lower middle part of the rear wheel frame 24 connecting left and right, so that the body frame 4 does not become high and the rear wheel frame 24 does not become low Becomes
Therefore, it is possible to reduce the difficulty of traveling when traveling on a place where the wheels are deeply immersed in the soil without increasing the vehicle height.

[Brief description of the drawings]

 The figure shows an embodiment of the present invention. Fig. 1: Side view of rice transplanter embodying the present invention Fig. 2: Partial plan view of rice transplanter embodying the present invention Fig. 3: Explanatory view showing transmission mechanism Fig. 4: Perspective view of main parts Fig. 5 Fig .: Partial rear view Fig. 6: Partial partial cross-sectional side view Main components are briefly described by reference numerals in the figure. 4: Body frame 8: Rear wheel 13: Front wheel 23: Rear wheel gear case 24: Rear wheel frame 25: Rolling shaft

────────────────────────────────────────────────── ─── of the front page continued (72) inventor Kamiya, Ehime Prefecture Iyo-gun, Tobe-cho, Yakura the address 1 Minori Iseki Machinery Co., Ltd. technology Department examiner Hiroshi Niki Kotobuki (58) investigated the field (Int.Cl. ^6, DB name) B60K 17/00-23/08 A01C 11/00

Claims (1)

(57) [Claims] 1. A steering front wheel 13, 13 which is driven and rotated, is fixed so as not to be vertically movable with respect to the fuselage, and a non-steering left and right rear wheel 8.8 which is driven and rotated is a shaft center in the longitudinal direction of the fuselage. The rolling shaft 25 is a rear part of the body frame 4 extending in the longitudinal direction of the body, and is lower than the upper end of the body frame 4 and higher than the lower end thereof. And a rear wheel gear case 23, which is provided with an axle for the rear wheels 8, 8, is rotatably connected to an upper and lower intermediate portion of a rear wheel frame 24 connecting left and right. Body.