JPH0820367A - Traveling vehicle body - Google Patents

Abstract

PURPOSE:To improve the steering property of a traveling vehicle body using crawlers as travel propelling bodies on the rear side. CONSTITUTION:The front section of a vehicle body is supported by steerable wheel-like front wheels 16, 16 on the ground, and the rear section of the vehicle body is supported by crawlers 17, 17 on the ground. The lower ends of the front wheels 16, 16 are located below the extension line of the lower plane of the crawlers 17, 17 so that the front wheels 16, 16 bite into soil when this vehicle is traveled on the soft soil of a field or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body suitable for a vehicle body for a non-tillage transplanter for transplanting seedlings into a field that is not tilled.

[0002]

2. Description of the Related Art A non-tillage transplant method is used to grow a robust crop capable of adapting to environmental changes by planting rice seedlings with water in an uncultivated field and giving the seedlings severe growth conditions. The rice cultivation method has been attracting attention recently. Although it is a non-tillage transplant, it is not possible to plant seedlings directly on the hard topsoil that has not been cultivated.Therefore, the topsoil is partially cultivated prior to planting seedlings, and seedlings are planted at the cultivated location. I try to plant it.

Therefore, the transplanter used for this no-tillage transplant is provided with a partial tiller for seedling planting, and the weight of the working machine part is heavier than that of an ordinary rice transplanter, and , The traveling vehicle body that supports the heavy work equipment and supplies power to it is also becoming larger. For this reason, when the traveling propelling body of the traveling vehicle body is a wheel, the wheel mark remains as a deep rut due to the heavy vehicle body weight, which causes a problem in seedling transplantation. Therefore, there is a no-tillage transplanter in which the rear wheel side, which takes a large amount of vehicle body weight, is used as a crawler to reduce the sinking of the traveling propulsion body into the ground.

[0004]

However, when the traveling propelling body is a crawler, the ground contact surface is wide, so that the ground contact surface is less likely to sink to the ground. The maneuverability was unstable because the center of rotation of the airframe changed due to changes in the center of gravity due to movement of the robot, or unevenness in the field. An object of the present invention is to improve the steerability of a traveling vehicle body in which a traveling propelling body on the rear side is a crawler. In order to achieve this, the following configuration is adopted.

[0005]

That is, in a traveling vehicle body according to the present invention, the front portion of the vehicle body is supported by the steerable front wheels on the ground, and the rear portion of the vehicle body is supported by the crawler on the ground.
In the vehicle body supporting state, the lower end of the front wheel is positioned below the extension line of the lower surface of the crawler.

[0006]

[Operation] By locating the lower end of the front wheel below the extension line of the lower surface of the crawler, when traveling on soft soil such as a field, the front wheel bites into the soil and side slippage of the front wheel disappears. Steerability is improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A traveling vehicle body for a no-tillage transplanter will be described below as one embodiment of the present invention. 1 to 4 show a state of being configured as a no-tillage transplanter, in which a partial tilling device 3 and a planting work machine 4 are mounted so as to be able to move up and down via a lifting link device 2 behind a traveling vehicle body 1. ing.

In the traveling vehicle body 1, a main frame 7 is fixedly provided on the rear surface of a mission case 6 arranged at the front of the machine body to form a machine body frame, and an engine 8 is provided above the front and rear central portions of the main frame. It is installed. The cockpit 11 is installed on the engine cover 10 that covers the engine 8. In front of the cockpit 11, an operating section 12 in which various operating tools are assembled is erected, and a steering handle 13 is provided above it. Around the engine cover 10 and the operation section 12, there is a horizontal step floor 14 which allows the operator to walk freely.

The traveling propelling body includes a pair of left and right wheel-shaped front wheels 16 and 16 and a pair of left and right crawlers 17 and 17 located on the rear side thereof. As shown in FIG. 5, the front wheel 16 has an outer peripheral portion of a tire 16a formed in a wedge shape in cross section,
It is easy to cut into uncultivated land. In addition, the crawler 17 includes a rear drive wheel 17a and a front driven wheel 17b.
And a rolling wheel 17c provided diagonally above the driven wheel, the running endless track is wound around, and the lower part thereof moves from the front to the rear when moving forward and from the back to the front when moving backward. Has become.

The front wheels 16, 16 are supported on the lower portions of the front wheel final cases 20, 20 provided on the left and right side surfaces of the mission case 6. Main frame 7 and front wheel final case 20, 20 are front axle cases 21, 2.
Tied by one. Front wheel final case 20,
The lower part of 20 is configured to be able to turn with respect to the upper part, and by rotating the steering handle 13, the direction of the lower part of the front wheel final case 20, 20 is changed, and thereby the front wheels 16, 16 are steered.

The driving wheels 17 of the crawlers 17, 17
a, 17a, driven wheels 17b, 17b, and rolling wheels 17
c, 17c for supporting crawler support plates 23, 23
Has a rear portion which is vertically swingable about the axes of the driven wheels 17b and 17b, and the rear portion is vertically moved by the crawler lifting cylinders 24 and 24.
Therefore, it is possible to change the vertical direction of the crawlers 17 and 17, and when the crawler lift cylinders 24 and 24 are contracted, the lower portions of the crawlers 17 and 17 become horizontal (step floor 1
4) and the crawler lifting cylinders 24, 2
When 4 is extended, the lower parts of the crawlers 17, 17 are in a state of going up. In addition, the crawler lifting cylinders 24, 24
The main body side is pivotally attached to the main frame 7, and the piston side is connected to the crawler support plates 23, 23. Inside the drive wheels 17a, 17a are crawler drive cases 27, 2 which support shafts S10, S10 of the drive wheels.
7 is provided integrally with the crawler support plates 23, 23.

Regarding the vertical positional relationship between the front wheels 16 and 16 and the crawlers 17 and 17, when the lower portions of the crawlers 17 and 17 are in a horizontal state, the lower ends of the front wheels 16 and 16 are more than the extension lines of the lower surfaces of the crawlers 17 and 17. Is also located below. When the rear parts of the crawlers 17 and 17 are lowered, the lower ends of the front wheels 16 and 16 are located below the extension line of the lower parts of the crawlers 17 and 17.

Next, the transmission structure of the traveling vehicle body 1 will be described (see FIG. 6).

Rotational power of the engine 8 is transmitted to the HST 32 via the first belt transmission device 31, and further HS
The rotational power after shifting by T32 is transmitted to the mission case 6 via the second belt transmission device 36 having a continuously variable transmission mechanism, and is transmitted to the hydraulic pumps 38, 39 via the third belt transmission device 37.

The transmission side pulley 36a of the third belt transmission 36 and the transmission portion of the transmission input shaft S1 are configured as a main clutch A. The rotational power input to the transmission case 6 via the main clutch A is divided by the main transmission device B into traveling power and working machine power.

The driving power is transmitted through the front differential device C to the left and right front axles S2, S2, the front wheel final shafts S3, S3, and the front wheel axles S4, S4 in this order, and also through the rear differential device D. The left and right rear differential shafts S5, S5, crawler output shafts S6, S6, crawler transmission shafts S7, S7, crawler input shafts S8, S8, counter shafts S9, S9, crawler drive shafts S10, S10 are transmitted in this order. The differential devices C and D are provided with differential lock mechanisms Ca and Da that stop the differential function.

Further, side clutch / brake E, E shown in FIG. 7 is provided in the transmission portion from the rear differential shafts S5, S5 to the crawler output shafts S6, S6. G1 in the figure is a bevel gear attached to the rear differential shaft S5, G2
Is a bevel gear rotatably fitted to the crawler output shaft S6. The side clutch 41 is a multi-disc clutch,
The drive plates 41b of the outer cylindrical body 41a, which are spline-fitted to the bevel gear G2, and the passive plates 41d of the inner cylindrical body 41c, which are integrally provided on the crawler output shaft S6, face each other, and a ring-shaped leaf spring is provided. 41e, ... by the slider 41
By pressing f against the outer cylinder 41a, the drive plate 41
.. and the passive plates 41d ,. When the shifter 41g is operated to release the pressing of the outer cylinder 41a by the slider 41f, the drive plates 41b, ... And the passive plates 41d ,.

The brake 42 presses the shoes 42b, ... On the drums 42a, ... Attached to the crawler output shaft S6 to brake the rotation of the crawler output shaft S6. When the shifter 41g is operated to the clutch disengagement side, the slider 41f presses the disc 42c and the shoes 42b, ... Press the drums 42a ,. Brakes.

The crawler transmission shafts S7, S7 are connected to the crawler output shafts S6, S6 and the crawler input shafts S8, S8 via universal joints, and the crawler input shafts S8, S8 are configured to be expandable and contractable. Crawler output shaft S6
Even if the positional relationship or distance between S6 and the crawler input shafts S8, S8 changes, it is possible to handle it.

Further, the power for the working machine is transmitted to the partial tilling device 3 and the planting working machine 4 via the working machine transmission shaft S11 to the planting clutch G after being shifted by the inter-stock transmission F. Reportedly. The planted clutch G is built in a planted clutch case 46 provided at the rear of the machine body.

The lifting link device 2 includes upper links 50, 50 and a lower link 5 at the rear end of the main frame 7.
1, 51 are attached rotatably up and down, and a vertical link frame 52 is connected to the rear ends of these links to form a parallel link structure as a whole. And the upper links 50, 50
The piston side of the working machine lifting cylinder 55 having the main body side pivotally attached to the main frame 7 is connected to the lower end of the swing arm 54 mounted so as to integrally operate with the working arm lifting cylinder 55. As a result, the links 50, 50, 51, 51 are operated up and down. When the links 50, 50, 51, 51 are operated up and down, the partial tilling device 3 and the planting work machine 4 move up and down in a substantially fixed posture.

The partial tilling device 3 is provided with a horizontal main frame 60 integrally attached to the lower side of the link frame 52, and a tilling mission case 61 is provided below the left and right central portions of the main frame 60. Six rotating discs 64, ... Are attached at equal intervals to the drive shaft 63 protruding laterally from the raising mission case so as to rotate integrally, and four plowing pawls 65 ,. When the drive shaft 63 is rotated while the lower part of the plowing claws 65, ... Is submerged in the soil, the plowing is partially performed at six equal intervals.

The plowing claws 65, ... Are covered with covers 67, 67 so that the soil does not largely scatter from the plowing area to the outside. The cover 67 is fixed to the main frame 60 and covers the plowing claws 65, ... From the upper side to the front side, and the plowing claws 65 ,.
Side covers 67b, 67b covering both left and right sides, a rear cover 67c rotatably attached to the rear side of the upper cover 67a about the left and right lateral axes, and a plowing claw 65 in the cover 67. It is composed of partition plates 67d ,. The rear cover 67c is configured such that, during plowing, the lower end portion of the cover is in contact with the surface soil surface after plowing and is leveled. Further, at the lower end portion of the rear cover 67c, left and right positions are formed with plowing claws 65 and notches 68, ... Positioned in the middle of the plowing claws 65, ...
... is designed to pass.

The driving of the partial tilling device 3 is transmitted from the planting clutch case 46 to the tilling mission case 61 by a transmission shaft 69 via a universal joy, and the input rotational power is fed into the tilling mission case 61. The transmission shaft 63 is rotationally driven after the gear shift.

The planting work machine 4 has a structure of six-row planting, a transmission case 70 also serving as a frame, a seedling placing table 80 for holding and placing seedlings at a predetermined position one by one,
The planting devices 90 for the number of planting lines (6 sets) for planting the seedlings supplied to the predetermined position by the seedling mounting table in the field scene, receive a part of the weight of the planting work machine 4 in the field scene. Gauge wheel 10
It has 0, ...

The transmission case 70 has transmission pipes 72, 72 projecting laterally from the left and right side portions of the main case 71 located in the center portion of the left and right sides. A total of three planted transmission cases 73, 73, 73 are provided rearward from the left and right ends, and are configured in an E shape in plan view as a whole. And each planted transmission case 7
3, 73, 73 on the left and right sides of the rear end of the seedling planting position Y,
The planting devices 90, ... Are provided so that the. The front part of the rolling shaft 75 protruding forward from the left and right center part of the main case 71 is the plowing mission case 6
1 is inserted and supported, and the entire planting work machine 4 is supported in a rollable manner.

The seedling placing table 80 is provided so as to be inclined so that the front side is in a higher position, and the supporting rail 81 fixed to the transmission case 70 and the left and right planting transmission cases 73, 73 are fixed to the seedling placing table at their bases. It is supported by rollers 83, ... Attached to the upper end of the support frame 82, and is slidable right and left. The upper surface of the seedling mounting table 80 is the seedling mounting portion 80 for the number of planting rows.
are partitioned by a, ..., and seedling feeding belts 85, ... Further, adjacent to the lower end portion of the seedling mounting table 80, a seedling receiving plate 87 having a seedling taking port 86, ... Corresponding to the planting device 90, ... Is provided integrally with the support rail 81. Left and right ends of the laterally moving rod 88 protruding laterally from the main case 71 and the seedling mount 80
The lower left and right side surfaces of the seedlings are connected by connecting plates 89, 89, and the lateral movement rod 88 reciprocates left and right to reciprocate the seedling mounting table 80 left and right as well. The seedlings on the table are sequentially supplied to the seedling taking port 86, ...

The planting devices 90, ...
Are attached to the left and right ends of the planting device mounting shafts 91 ,.
Each planting device 90 includes a rotating case 92 that rotates integrally with the planting device mounting shaft 91, and a pair of implanting rods 93, 93 attached to both ends of the rotating case. The transmission mechanism in the rotating case 92 causes the planting rods 93, 93 to rotate in a direction opposite to the rotating direction of the rotating case 92, and the tip of a fork-shaped seedling separating claw 93a fixed to the planting rod is vertically deformed into an elliptical shape. Operates to draw a closed trajectory. Thereby, the seedling separating nail 93
a separates and holds the seedling supplied to the seedling take-in port 86 of the seedling mounting table 80, and plant it in the soil appropriately cultivated by the plowing claws 65, ....

A total of three gauge wheels 100 are provided.
Rotation fulcrum shaft 1 on the upper surface of the rear end of each transmission case 73 with planting.
01, ... are projected, and the gauge wheels 100, ... Are attached to the support frames 102 ,.
Is rotatably supported. Therefore, the gauge wheel 10
0, ... Rolls on the farm scene while changing direction at any time following the progress of the aircraft.

The planting work machine 4 is driven by the plowing mission case 61 via a universal joint.
12 is transmission-coupled to the main case 71. Main case 71
Includes a seedling table reciprocating mechanism that reciprocates the lateral moving rod 88 to the left and right, and a seedling feeding mechanism that intermittently drives the seedling feeding belts 85, ... For each one row of seedlings. The power transmitted to the main case 71 is transmitted to the transmission pipe 7
2, 72 and the planting transmission cases 73, 73, 73, 73 via the transmission mechanism in the planting device mounting shafts 91 ,.

When carrying out the planting work, the seedlings are placed on the seedling mounting table 80, the elevating link device 2 is lowered, the partial tilling device 3 and the planting working machine 4 are lowered to the working position, and the partial plowing is carried out. The traveling vehicle body 1 is started while driving each part of the device 3 and the planting work machine 4. While the gauge wheel 100, ... Rolls on the surface soil surface, the partial tilling device 3 and the working machine 4 with plant move, and first, the partial tilling device 3 partially cultivates 6 rows on the surface soil surface of the field, Seedling take-in port 8 by left and right reciprocating movement of seedling table 80
6, the seedlings to be supplied to the planting device 90, ...
3, ... Receives one share at a time, and receives it for the plowing site K,
Plant it in ...

At the time of planting work, the rear parts of the crawlers 17, 17 are raised so that the entire lower surfaces of the crawlers 17, 17 are grounded (see FIG. 1). At this time, the front wheels 16,1
Since 6 is in a state of digging into the soil and the front wheels 16 and 16 do not skid, seedlings are planted accurately at the plowing site K, .... Since the entire lower surfaces of the crawlers 17 and 17 are grounded, the field is less likely to be damaged.

At the time of turning, the partial tilling device 3 and the planting work machine 4 are raised, and the rear portions of the crawlers 17, 17 are lowered so that only the rear end portions of the crawlers 17, 17 are grounded. The drive of the inner crawler 17 is stopped and the brake is applied (see FIG. 2). Then
The body turns around the rear end of the crawler 17 on the inside of the turn as a fulcrum. Since the front wheels 16 and 16 and the rear ends of the crawlers 17 and 17 bite into the soil, the body does not swing to the left and right, and the turning performance is good. Also, crawler 1
By lowering the rear portions of the bodies 7 and 17, the center of gravity of the machine body shifts to the front side, so that the above turning operation can be smoothly performed.

When traveling on the road, the partial tilling device 3 and the planting work machine 4 are raised, and the rear parts of the crawlers 17 and 17 are set to an intermediate position between the planting work and the turning, and the front wheels 16 and 1 are rotated.
6 and the rear ends of the crawlers 17, 17 are grounded to run (see FIG. 3). Since the front wheels 16 and 16 do not bite into the soil on the road, the rear parts of the crawlers 17 and 17 are lowered by that amount to prevent the center of gravity from becoming rear and maintain balance. In addition, the crawler 17, 17
Since the rear part is not lowered, the front center of gravity will not be unnecessarily increased.

[0035]

As described above, the traveling vehicle body according to the present invention can be used when traveling on soft soil such as a field by positioning the lower end of the front wheel below the extension line of the lower surface of the crawler. In addition, the front wheels bite into the soil, and the sideslip of the front wheels disappeared, so the steerability was improved.

[Brief description of drawings]

FIG. 1 is a side view showing a state of a no-tillage transplanter constructed using a traveling vehicle body according to the present invention during a planting operation.

FIG. 2 is a side view showing the state of the no-tillage transplanter shown in FIG. 1 when turning.

FIG. 3 is a side view showing a state when the no-tillage transplanter shown in FIG. 1 is traveling on a road.

FIG. 4 is a plan view of the no-tillage transplanter shown in FIG.

FIG. 5 is a front view of a front wheel.

FIG. 6 is a transmission system diagram of a traveling vehicle body.

FIG. 7 is a diagram showing a half of a side clutch / brake in outline and the other half in cross section.

FIG. 8 is a side view of the partial tilling device and the working machine with planting.

FIG. 9 is a rear cross-sectional view showing the tilled state of the partial tiller.

FIG. 10 is a cross-sectional view showing a state of a plowing part.

[Explanation of symbols]

 1 Traveling Vehicle 2 Elevating Link Device 3 Partial Plowing Device 4 Working Machine with Planting 16 Front Wheel 17 Crawler

Claims (1)

[Claims] 1. A front portion of a vehicle body is supported on the ground by steerable front wheels, and a rear portion of the vehicle body is supported by a crawler on the ground.
In the vehicle body supporting state, the traveling vehicle body characterized in that the lower end of the front wheel is located below an extension line of the lower surface of the crawler.