JPH10327620A - Rice transplanter - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide a rice transplanter that employs a component arrangement that is useful for adjusting the weight balance in the front-rear direction. SOLUTION: A front wheel speed increasing device 9 is provided in a traveling transmission system of a rice transplanter in which a seedling planting device A is connected to a rear end of a traveling machine body 1, and the front wheel speed increasing device 9 is provided with front wheel cases on left and right. It is mounted on the rear surface of the left / right front axle case 11 at the center in the left / right direction to increase the weight at the front of the body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice transplanter having a seedling planting device connected to a rear end of a traveling machine body.

[0002]

2. Description of the Related Art In a rice transplanter, the front and rear wheels are driven to rotate at substantially the same speed to set the running speed of the body.

[0003]

In this case, there is a drawback that when the vehicle turns around the ridge, the airframe is swung outward by the centrifugal force and the field is roughened. SUMMARY OF THE INVENTION An object of the present invention is to provide a rice transplanter which can be used as a part transplanter to eliminate the balance between the front and rear of the fuselage, in addition to solving the above-mentioned disadvantages.

[0004]

[Means for Solving the Problems]

[Structure] The characteristic structure of the invention according to claim 1 is that the engine is arranged at the front part of the traveling body with the seedling planting device connected to the rear end, and the front and rear wheels are driven to rotate at substantially the same speed. A front wheel speed-up device that can be switched to a speed-up state in which the rotation speed of the front wheels is set higher than the rotation speed of the wheels is provided. It is arranged and provided, and one of the front and rear support portions is constituted by a front wheel speed increasing device, and the operation and effect are as follows.

[Operation] In other words, by providing the front wheel speed increasing device, the rotation speed of the front wheel can be set higher than the rotation speed of the rear wheel, and the front wheel pulls the rear wheel. Side slip during turning of the front wheel is suppressed.

[Effect] Therefore, it is possible to suppress the roughening of the field due to the side slip of the front wheel during turning. In addition, by using the newly provided front wheel speed increasing device for the front wheel case supporting portion, it is not necessary to separately provide a structure for supporting the front wheel case. Since it is also used as a supporting portion of the wheel case, it can be arranged near the front wheel, and this front wheel speed increasing device can also be used as a balance weight. In other words, rice transplanters tend to be larger and heavier due to the increase in the number of seedling planting devices connected to the rear end, and it is becoming more common to add auxiliary devices such as fertilizers. As a result, the center of gravity is shifting later, and the balance weight attached to the front of the traveling aircraft is currently becoming enormous. On the other hand, the one adopted as an indispensable device, here, the front wheel speed-up device, can be arranged near the front wheel, so the effect of suppressing the tendency of the rice transplanter to be at the rear center of gravity is achieved. There is.

[Structure] The characteristic structure of the invention according to claim 2 is the characteristic structure of the invention according to claim 1, wherein the front wheel speed increasing device is used only when the traveling speed of the body is set to the planting work speed. The point is that a check means for switching to the speed increasing state is provided, and the operation and effect are as follows.

[Effects] That is, the front wheel speed-up device switches to the speed-up state only when the vehicle runs at the planting operation speed.
Therefore, in a state in which the vehicle runs at a speed higher than the planting operation speed, the state is not switched to the speed-up state, and a state in which the front wheels are further accelerated in the high-speed state can be avoided, and dangerous running can be automatically avoided.

[Structure] According to a third aspect of the present invention, in the characteristic structure of the second aspect, the check means includes a rotating spool which switches between the speed increasing state and the constant speed state by a rotation operation. This means is a means for switching between a shift state and a shift-disabled state by driving the rotary spool in the forward and reverse directions in the axial direction. The operation and effect are as follows.

[Effects] That is, as a check means,
The function can be achieved by a structure in which the rotary spool is simply moved forward and backward in the axial direction, and the structure can be achieved with a simple structure.

[Structure] According to a fourth aspect of the present invention, in the characteristic structure of the third aspect of the present invention, a front wheel speed-up operating mechanism for rotatingly driving the rotary spool and a steering operation mechanism for a traveling body are provided. In addition to the above, the control unit of the traveling body is provided above the front wheel speed increasing device, and the operation and effect are as follows.

[Effects] In other words, by arranging the front wheel speed increasing device below the steering section, the front wheel speed increasing operation mechanism and the steering operation mechanism can be linked at a short distance. It is compact and it is easy to secure a space for arranging the linkage mechanism.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a link mechanism 3 is provided at a rear end of a traveling machine body 1 so as to be vertically movable by a lift cylinder 2.
A seedling planting device A is connected to the link mechanism 3 so as to be able to freely roll around an axis X in a front-rear direction, and an engine 4 is arranged at a front portion of the traveling machine body 1. The output shaft is connected to the hydrostatic continuously variable transmission 5 and the transmission case 6 at the rear of the fuselage.
A rear wheel case 8 provided with a rear wheel 7 behind the transmission case 6 and a front axle case 11 provided with a front wheel speed increasing device 9 and a front wheel 10 in front of the transmission case 6 are arranged to provide a riding type rice transplanter. Make up.

As shown in FIG. 2, a main clutch case 12 is disposed behind the engine 4 and the engine 4 and the main clutch case 12 are connected to each other by a coupling 13 using rubber. The coupling 13 is supported by bearings 14 arranged in front and rear, and the engine 13 and the bearing 14 support the coupling 13 in a floating state. A support bracket 15 and a front wheel speed increasing device 9 are further disposed behind the main clutch case 12, and are sandwiched between a support boss 15 A of the support bracket 15 and a support boss 9 A of the front wheel speed increasing device 9 from front and rear. The front axle case 11 is rotatably supported. Main clutch case 1
A first propeller shaft 16 and two couplings 17, 17 are connected between the transmission 2 and the hydrostatic continuously variable transmission 5 to enable power transmission. Two couplings 1
Although the claws 7 and 17 were used, they were changed to splines to suppress the generation of connection noise. The power input to the hydrostatic continuously variable transmission 5 is input to the front wheel speed increasing device 9 by a second propeller shaft 18 having universal joints at both ends.

The structure of the front wheel speed increasing device 9 will be described.
As shown in FIG. 4, an input shaft 19 and an output shaft 20 connected to a second propeller shaft 18 are installed in parallel, and a first gear 21 and a second gear 22 are attached to the input shaft 19 so as to be integrally rotatable. It is. A third gear 23 meshing with the first gear 21 is loosely fitted to the output shaft 20, and a fourth gear 24 meshing with the second gear 22 is loosely fitted. A clutch sleeve 25 and a clutch support 26 are integrally rotatable with the output shaft 20 between the fourth gear 24 and the third gear 23.
Are slidably movable in the axial direction of the output shaft 20. A friction plate 27 is provided between the fourth gear 24 and the clutch support 26, and the friction plate 2 is
7 is crimped to reveal a clutch engaged state.

In the above configuration, the clutch sleeve 25
When the gear is moved closer to the third gear 23 side, the external gear portion formed on the side surface of the clutch sleeve 25 and the internal gear portion formed on the side surface of the third gear 23 are engaged with each other. The power input to the first gear 21 is transmitted from the third gear 23 to the clutch sleeve 25, and transmitted from the clutch sleeve 25 to the output shaft 20. This state is a constant speed state in which the front and rear wheels 7, 10 are driven at substantially the same speed. next,
When the clutch sleeve 25 is moved to the opposite side to approach the clutch support 26, the clutch sleeve 25 presses the friction multi-plate 27 and the clutch support 26 and the fourth gear 24
And the power input to the fourth gear 24 is transmitted from the clutch support 26 to the output shaft 20. This state is a speed-up state in which the front wheels 10 are driven at a higher speed than the rear wheels 7. In this case, the speed is set to be 1.88 times faster in the speed increasing state than in the constant speed state. As shown in FIG. 6, the axis of the output shaft 20 is provided so as to coincide with the front-rear axis X connecting the left and right centers of the traveling body 1, and the input shaft 1
The axis Y of 9 is slightly eccentric at the upper right.

The linkage between the front wheel speed-up device 9 and the steering wheel operation mechanism will be described first. FIG.
As shown in FIG. 7, a pitman arm 29 linked to a steering handle 28 and a knuckle arm 30 for swinging and driving the front wheel 10 are connected by a tie rod 31. A cam plate 32 having a cam groove 32A is fixed to the pitman arm 29, and a drive arm 33 belonging to a front wheel speed increasing operation system is pivotably supported near the cam plate 32. An engagement pin 33A is erected from the drive arm 33, and the engagement pin 33A is
Is engaged with the cam groove 32A, and the steering handle 28 is operated in either of the left and right directions.
°), the drive arm 33 is driven to swing. As shown in FIGS. 4 to 6, a clutch yoke 34 for slidingly driving the clutch sleeve 25 is provided inside the front wheel speed increasing device 9.
A rotary spool 35 which engages with and drives the clutch yoke 34 to slide is pivotally supported by the front wheel speed increasing case. The rotating spool 35 is rotatable around its own axis, and an eccentric engaging pin 35A is protrudingly provided at the tip end surface. The engaging pin 35A is engaged with an engaging concave portion of the clutch yoke 34. is there. When the rotation spool 35 is rotated around its own axis, the engagement pin 35A rotates around the axis with a constant radius, and slides the clutch yoke 34 which is urged to return to the constant speed state. A driven arm 36 is integrally fixed to an outer end of the rotary spool 35 protruding from the front wheel speed-increasing case, and the driven arm 36 and the driving arm 33 are connected by a connecting rod 37 as shown in FIG. As described above, by operating the steering handle 28, the rotary spool 35 is rotationally driven to switch the front wheel speed increasing device 9 between the speed increasing state and the constant speed state. The arm length from the swing fulcrum of the drive arm 33 to the connection point with the connecting rod 37 is a multiple of the arm length from the swing fulcrum to the engagement pin 33A. Therefore, the amplification structure can be simplified. Since the front wheel speed increasing device 9 is mounted on the rear surface of the front axle case 11, the front wheel speed increasing device 9 is located below and below the steering handle 28, and the front wheel speed increasing device 9 and the steering handle 28 are connected. It is possible to simplify the speed increasing state switching mechanism to be connected. That is, the drive arm 33 and the connecting rod 37
And the bending of the rod and the arm at the time of switching to the speed increasing state at the connection portion with the rod can be suppressed.

The restraint means C for preventing the front wheel speed increasing device 9 from switching to the speed increasing state will be described. As shown in FIG. 3, the swing drive arm 38 that engages with the rotating spool 35 and moves the rotating spool 35 forward and backward in the axial direction of the spool is supported, and the swing drive arm 38 is supported by the swing drive arm 38. A shaft 39 is provided with an interlocking arm 40 that swings integrally with the swinging drive arm 38, and the interlocking arm 40 is connected to a balance-type shifting arm 41 pivotally supported by the transmission case 6 by a connecting rod 4.
2 are linked. As shown in FIG. 1, the speed change operation of the auxiliary transmission device 6 </ b> A provided in the transmission case 6 is performed by the transmission arm 41 pivotally supported by the transmission case 6. A speed change lever 44 is linked, and the sub speed change lever 44 is positioned on the left side of the driver's seat 45 so that a speed change operation is possible. Here, as shown in FIG.
When the speed change operation is performed, the speed change arm 41 swings and the speed change operation is performed. In this case, when the shift arm 41 is shifted to the high-speed running position, the swing drive arm 38 swings to pull out the rotary spool 35 outward, and the engagement pin 35A of the rotary spool 35 Thus, the front wheel speed increasing device 9 is prevented from switching to the speed increasing state.

As shown in FIG. 3, a front axle case 11 is provided on the front side of the front wheel speed-increasing device 9, and the front wheel case 11 is a cylindrical one-piece having a shaft center set in the left-right direction. The front wheel differential mechanism B is provided in the case. As shown in FIG. 4, the front wheel differential mechanism B has a front axle case 11 formed of two cylindrical bearings 47, 47 on an integral body.
A differential case 46 pivotally supported about the axis of the differential case 46, and two side gears 48A housed in the differential case 46,
48A, two differential pinion gears 48B, 48B, a differential pinion shaft 49, and a differential gear 50 externally fitted and fixed to one end of the differential case 46. The front wheel differential mechanism B
The engagement between the bevel gear 20A formed at one end of the output shaft 20 of the front wheel speed increasing device 9 and the differential gear 50 causes the front wheels 10
It is configured to take in rotational power to the motor. As shown in FIGS. 4 and 6, in the front wheel speed increasing device 9, as described above, the axis of the output shaft 20 is provided so as to coincide with the front and rear axis X connecting the left and right centers of the traveling body 1. And
The axis Y of the input shaft 19 is slightly eccentric at the upper right.
On the other hand, in the front wheel differential mechanism B, the axis position of the differential pinion shaft 49 is parallel to the front-rear axis X connecting the left and right centers of the traveling body 1 and the axis position of the input shaft 19 is the front-rear axis X.
Are located on the opposite side. As a result, the front wheel differential mechanism B and the front wheel speed increasing device 9 are positioned on opposite sides of the longitudinal axis X so as to achieve weight balance.

As shown in FIG. 4, further on the side of the differential case 46, a differential lock case 51 is attached to the left front axle 5.
2 is externally slidably and rotatable integrally,
On the opposing side surfaces of the differential lock case 51 and the differential case 46, a claw-type engaging portion 51A that can be freely fitted and detached is provided. An annular groove-type engaging portion 51B is provided at the end of the differential lock case 51 on the opposite side of the claw-type engaging portion 51A, near the flange portion 11A serving as a connecting portion of the front axle case 11 to the front wheel case 53. Has been extended. Here, a differential lock mechanism R is configured by a claw-type engagement portion between the differential case 46 and the differential lock case 51. As shown in FIGS. 2 to 4, a support boss 11B is erected near the flange portion 11A of the front axle case 11 so as to penetrate the cylindrical wall of the front axle case 11, and the rotary shaft 54 is fitted into the support boss 11B. I do. An L-shaped clutch yoke 55 is fixed to an inner end of the rotating shaft 54 that has entered the front axle case 11. The clutch yoke 55 is engaged with the annular groove engagement portion 51 </ b> B of the differential lock case 51. I have. Support boss 1 for rotating shaft 54
An outer end protruding from 1B extends along the axis of the front axle case 11 to the opposite side across the front-rear axis X. A relay fulcrum 56 is provided at the extended end position to provide a differential lock operating tool. (Not shown). With the above-described configuration, the engagement and disengagement between the differential lock case 51 and the differential case 46 can be switched by rotating the rotation shaft 54 forward and backward.

[Other Embodiments] In addition to the above-described embodiment, the present invention can employ the following configuration. The mounting position of the front wheel speed increasing device 9 may be on the front side of the front axle case 11. As a configuration for switching the front wheel speed increasing device 9 between the constant speed state and the speed increasing state, a configuration in which a steering operation system and a shifter for the front wheel speed increasing device 9 are mechanically linked is adopted. As a configuration for switching 9 between the constant speed state and the speed increasing state, an actuator such as a hydraulic cylinder is employed and a detection sensor for detecting the operation angle of the steering handle 28 is provided. At this point, the actuator may be operated to switch to the speed increasing state. Thereby, the configuration itself can be simplified. When the traction control means C is configured with respect to the configuration of the front wheel speed increasing device 9 as described above,
A sensor for detecting the operation position of No. 4 may be provided to control such that an operation signal is not issued to the actuator when the operation position is operated to the high-speed position.

[Brief description of the drawings]

FIG. 1 is an overall side view of a rice transplanter.

FIG. 2 is a side view showing a traveling power transmission system.

FIG. 3 shows the arrangement of a front axle case and a front wheel speed increasing device, and
Plan view showing the linkage between the front wheel speed increasing device and the steering operation system

FIG. 4 is a cross-sectional plan view showing a state where a front wheel speed increasing device and a front wheel differential mechanism are provided on a front axle case.

FIG. 5 is a longitudinal rear view showing a support bracket for supporting the front axle case on the front side.

FIG. 6 is a longitudinal sectional rear view showing the front wheel speed increasing device.

[Description of Signs] 1 traveling body 4 engine 7 rear wheel 9 front wheel speed-up device 10 front wheel 11 front axle case A seedling planting device C restraining means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masakazu Furuichi 64 Ishizu-Kitacho, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (4)

[Claims] An engine is arranged at a front part of a traveling machine body having a seedling planting device connected to a rear end thereof, and a constant speed state in which front and rear wheels are driven to rotate at substantially the same speed. A front wheel speed increasing device that can be switched to a speed increasing state in which the rotation speed is set to a high speed is provided, and a support portion that supports the front axle case in a freely rotatable left and right direction is provided before and after the front axle case, and one of the front and rear is provided. A rice transplanter whose supporting part is composed of a front wheel speed increasing device. 2. The rice transplanter according to claim 1, further comprising a check means for switching the front wheel speed increasing device to a speed increasing state only when the traveling speed of the traveling body is set to the planting operation speed. 3. A rotation spool, which is switched between the speed increasing state and the constant speed state by a rotation operation, is driven forward / reversely in the axial direction of the rotation spool to switch between a gear shiftable state and a gear shift disabled state. 3. The rice transplanter according to claim 2, which is a means. 4. A front body speed increasing operation mechanism for rotatingly driving the rotary spool and a steering body steering operation mechanism are linked, and a steering section of the traveling body is provided above the front wheel speed increasing device. 3. The rice transplanter according to 3.