JPH03206802A - Traveling device for riding rice transplanter - Google Patents

Abstract

PURPOSE:To properly subject changeover member to operation control in change of steering angle of prescribed value or above and readily obtain stabilized control action by interlocking and coupling the changeover member to power steering actuator part for steering front wheels in interlock with steering handle operation. CONSTITUTION:When steering angle of a handle 14 becomes prescribed value or above in conversion of direction in butt, changeover valve 57 is changed in interlock with a power cylinder 43. A piston rod 98 of changeover cylinder 56 is retreated and advanced and clutch on low speed side is turned off and clutch on high speed side is turned on and outside front wheel being the largest in turning radius is rotated at high speed and the vehicle is turned, centering inside rear wheel on rear side of running vehicle to change the direction. Thereby it is prevented to give lateral sliding force to front wheels and changeover cylinder is properly operated and controlled in interlock with lateral turning operation of handle.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention uses a planting claw to take out a single seedling from a seedling stand that slides back and forth from side to side, and at a substantially constant speed by driving the front and rear wheels. The present invention relates to a traveling device for a riding rice transplanter that moves on a bicycle and performs rice transplanting work continuously.

``Conventional technology'' Conventionally, in order to improve straight-line performance during rice transplanting work, a differential mechanism equipped with a locking device was provided, and the left and right front wheels were driven through the differential mechanism, thereby reducing the rotational difference between the left and right front wheels when turning. There was a technology to absorb it into the differential mechanism.

"Problems to be Solved by the Invention" The above-mentioned prior art is suitable for situations where the centrifugal force is negligible when changing direction on a headland (low-speed turning is performed, but the rear wheels with a small turning radius and the rear wheels with the largest turning radius Because the large outer front wheels move at approximately the same speed, on slippery muddy roads, a large skidding force acts on the left and right front wheels, which tends to cause irregular turns in which the traveling trajectory becomes abnormally curved, resulting in poor maneuverability and stability. There were problems such as the inability to easily improve sexual performance.

``Means for Solving the Problems'' However, the present invention provides a speed change that changes the rotational speed of the front wheels to be faster than the rear wheels by changing the steering angle by more than a predetermined value in a riding rice transplanter that drives the front and rear wheels. In addition to providing a member, the transmission member is operatively connected to a power steering actuator portion that steers the front wheels in conjunction with operation of a steering wheel.

``Function'' Therefore, when changing direction on a headland, the front wheels move faster than the rear wheels, so even on slippery muddy surfaces, skidding force is prevented from acting on the front wheels, causing irregular turns. It is possible to easily prevent this, and it is possible to easily improve the maneuverability and stability of the riding rice transplanter compared to conventional methods.In addition, since the transmission member is actuated in conjunction with the power steering actuator, changes in the steering angle can be detected. This method does not require any special means to operate the steering wheel and does not increase the operating load of the steering wheel (
, it is possible to appropriately control the operation of the transmission member by changing the steering angle by more than a predetermined value, and it is possible to easily obtain stable control operation with a simple structure.

"Example" Embodiments of the present invention will be described in detail below based on the drawings.

Figure 1 is a hydraulic circuit diagram, Figure 2 is a side view of the riding rice transplanter, and Figure 3 is a plan view of the same. The rear end of the vehicle body frame (3) is connected to the transmission case (4), and the front wheels (6) for driving in paddy fields are supported on both sides of the front part of the transmission case (4) via the front axle case (5). A transmission case (7), which is an axle case, is connected to both rear sides of the transmission case (4), and a rear wheel (8) for driving in rice fields is supported at the rear end of the transmission case (7). (2) Bonnet (9
) A spare seedling stand (lO) is attached to the outside of both sides, and the transmission case (7) etc. are covered by the vehicle body cover (12) forming the step (11), and the vehicle body cover (12) is
) Attach the driver's seat (13) to the upper part;
A steering handle (1) is installed at the rear of the bonnet (9) in front of the
4).

Furthermore, (15) in the figure is a planting section that has a seedling stand (16) for multi-row planting, multiple planting claws (17), etc. Place the platform (16) on the guide rail (
18) and the planting case (19) via the guide rail (19).
A planting arm (22) and a planting claw drive shaft (
21) to the planting case (20).
). In addition, a support frame (24) is provided on the front side of the planting case (20) via a center bin (23), and a support frame (24) is provided via a three-point link mechanism (27) including a top link (25) and a lower link (26). A support frame (24) is connected to the rear side of the traveling vehicle (11), and the link mechanism (24) is connected to the rear side of the traveling vehicle (11).
It is equipped with an elevating cylinder (28) that raises and lowers the planting part (15) via the front and rear wheels (61 (81)), and at the same time moves at a substantially constant speed by driving the front and rear wheels (61 (81)). It is configured to take out -seedlings from the stand (16) using planting claws (17) and perform rice planting work continuously.

In addition, (29) in the figure is the travel gear change lever, (30) is the planting lift lever, (31) is the planting sensitivity adjustment lever, (32)
) is the latch pedal for running, (33) (331 is the left and right brake pedal, (34)... is the float for leveling the field, and the planting depth adjustment link (35) is used to control the planting case (20). ) The float (34)... is supported on the lower side.

As shown in FIGS. 4 and 5, the steering handle (14)
) is rotated left and right to control the steering of the front wheels (6), and a steering box (37) transmits the rotational displacement of the steering wheel (14) to the pitman arm (36);
A swing plate (40), which is a steering arm swingably supported on the axle transmission case (38) via a rotation fulcrum shaft (39), and an arm (41) fixed to the swing plate (40).
) A steering control valve (42) which is a drag rod interposed between one end and the pitman arm (36), and a piston rod (44) interposed between the other end of the arm (41) and the vehicle body frame (3). The steering power cylinder (
43), and a connecting rod (461 (471), which is a tie rod that connects the left and right knuckle arms (45) (45) integrally connected to the front axle case (5), and the rocking plate (40), respectively. The handle (14) includes a swing hunting prevention damper (48) interposed between the moving plate (40) and the transmission case (38).
When the spool (42a) of the control valve (42) is rotationally displaced.
l moves forward and backward, the power cylinder (43) expands and contracts as appropriate to change the direction of the front wheel (6), and at the time of conversion, the displacement of the cylinder (43) is fed back to the control valve (42) via the arm (41). , the control valve (42) is configured to return to neutral. In addition, the control valve (
42) is a hydraulic pump (4) fixed to the vehicle body frame (3).
9) via a hose (50), and two oil supply and oil return hoses +5 parallel to the cylinder (43).
11 (connected to the control valve (42) via 521).

Then, as shown in FIG. 1, a hydraulic pump (49) is connected to a hydraulic cylinder (28) for raising and lowering the planting part (15) via a lifting valve (53) and the control valve (42), The control valve (42) and the valve (
53) are installed in series, and the hydraulic cylinder (28) is switched by switching the valve (53) by operating the planting lift lever (30).
a transmission cylinder (56) that is a transmission member that controls the operation of the planting part (15), raises and lowers the planting part (15), and changes the rotational speed of the front wheels (6) in conjunction with the operation of the steering handle (14);
A speed change valve (57) that controls the operation of the cylinder (56)
), and the power cylinder (43) is equipped with a speed change valve (
57) and the spool (57) of the speed change valve (57).
al to the piston rod (44) of the power cylinder (43).
), and the variable speed valve (
57) is connected and the steering handle (14) is rotated to the left or right by a set angle or more, the gear shift valve (57) switches at a steering angle greater than or equal to the set steering angle in conjunction with the operation of the power cylinder (43), and the gear shift cylinder (56) ) is moved forward, while the speed change cylinder (56) is moved backward by a return spring (59) when the speed change valve (57) is in the neutral position.

Furthermore, as shown in FIG. 6, the human power shaft (60) of the mission case (4) is connected to the engine (2), and the front and rear output shafts (61) (62
) with differential mechanism (63) and side clutch mechanism (64)
The front and rear wheels f61 (81 are connected through the front and rear wheels f6
1 (configured to drive 81).

The input shaft (60) is interlocked and connected to the output shaft +611 (621) via the counter shaft (65).
Between the counter shaft (65) and the counter shaft (65) is a constant mesh reduction gear (661 (671 and
81 (69), and the intermediate transmission body (70), which is a coupling sleeve interposed between the gears +67) and +69) of the counter shaft (65), is connected to each clutch (711 (72)).
The counter shaft (65) is provided to rotate at high or low speed by appropriately coupling it to the gear (67) (691) through the counter shaft (65) and the output shaft (62). has a pair of reduction gears (731+74
1 is interposed therebetween, and the output shaft (62) is configured to rotate in the first forward speed state by meshing the gears (73) and (74).

On the other hand, a constant mesh gear (691 (7)) is attached to the counter shaft (65).
The transmission case (4) is equipped with a back gear shaft (76) that is interlocked and connected via the gear shaft (76), and the output shaft is operated by meshing the gear (74) with the back gear (77) that is integrally supported on the gear shaft (76). (62) is configured to rotate in the reverse state.

Further, a large diameter gear (78) is attached to the human power shaft (60).
The gear (78) is permanently engaged with a small-diameter gear (79) that supports the body and freely rotates on the gear shaft (76), and the gear (74) is operated to mesh with the gear (79). As a result, the output shaft (62) is configured to rotate in the second forward speed state.

Furthermore, the counter shaft (65) integrally supports a transmission gear (801 (811) (82)) for adjusting the distance between plants, and is slidably connected to the planting drive transmission shaft (83).
4) (85) to each of the gears (801 (81) (82)
The plant is configured to adjust the spacing (adjust the planting speed) in the planting section (15) by appropriately engaging the plants.

In addition, each of the output shafts +61) +621 is connected for free rotation,
Transmission gear with the same number of teeth that is always in mesh +861 (871
The front wheel counter shaft (88) is always interlocked and connected to the front output shaft (61) via the front wheel counter shaft (88), and the constant velocity transmission gear (89) and the high speed transmission gear (90) are engaged and supported by the rear output shaft (62). , a constant velocity gear (91) and a high speed gear (92) are freely rotatably supported on the front wheel counter shaft (88), and each gear (8
9) <911 and each gear for speed increase output +90) (
92) are always in mesh, and constant velocity and high speed gears 19
1) (Wet type multi-disc type equidistal side and high speed side clutch +931 that engages and connects 921 to the front wheel counter shaft (88)
(941 is provided, and each clutch +93) A clutch arm (
96) are integrally connected, and the mission case (4
) through the bracket (97) to the speed change cylinder (5).
6) is installed, the piston rod (98) of the cylinder (56) is connected to the clutch arm (96), and the piston rod (98) is protruded by the return spring (59). 93) and drive the front and rear output shafts (611+621 at the same rotation speed through the constant velocity gear (91), and when the steering angle of the steering handle (14) exceeds the setting, the variable speed valve (57) The transmission cylinder (56) is actuated via the piston rod (98).
) and fully activate the high-speed side clutch (94),
The front output shaft (61) is rotated at a higher speed than the rear output shaft (62) via a high-speed gear (92), so that the rotation speed of the front wheels (6) when turning is higher than that of the rear wheels (8). The speed change cylinder (56) is automatically controlled in conjunction with the power cylinder (43) operation so that the power cylinder (43) is operated.

This embodiment is configured as described above, and the handle (
14) when rotating left and right, the control valve (42)
The spool (42al) moves forward and backward by a certain amount accordingly, and the control valve (42) is switched from the neutral position to open the power cylinder (43).
) is supplied with high pressure hydraulic oil from the pump (49). Then, as the piston rod (44) of the cylinder (43) expands and contracts, the swing plate (40) swings to the left or right about the fulcrum shaft (39) via the arm (41), causing the front wheel (6
) and returns the control valve (42) to neutral.The amount of advance of the piston rod (44) changes in proportion to the steering angle of the steering handle (14), and the piston rod (44) Since the spool (57al) of the speed change valve (57) operates in conjunction with The speed change valve (57) switches, moves the piston rod (98) of the speed change cylinder (56) in and out, and closes the iso-distal side clutch (93).
, the high-speed side clutch (94) is manually switched, the outside front wheel (6) with the largest turning radius is rotated at high speed, and the traveling vehicle (11) is rotated around the inside rear wheel (8) on the rear side. +1) to change direction by turning the outer rear wheel (
The steering handle (1) prevents skidding force from acting on the front wheels (6) due to the propulsive force of the steering wheel (1), and also operates the speed change valve (57) in conjunction with the power cylinder (43).
4), and there is no need to provide a special mechanism for detecting the steering angle of the front wheels (6). The operation can be controlled appropriately.

"Effects of the Invention" As is clear from the above embodiments, the present invention provides front and rear wheels (61
The riding rice transplanter that drives f81 is provided with a transmission member (56) that changes the rotational speed of the front wheels (6) so that it becomes faster than the rear wheels (8) by changing the steering angle by more than a predetermined value, and also includes a steering handle. (14) The front wheels (6
) The power steering actuator section (43
) is interlocked with the transmission member (56), and the front wheels (6) move at a higher speed than the rear wheels (8) when changing direction at headlands, etc., so even on slippery muddy surfaces. It is possible to prevent skidding force from acting on the front wheels (6) and easily prevent irregular turns, etc., and it is possible to easily improve the maneuverability and stability of the riding rice transplanter compared to conventional ones, and Since the transmission member (56) is operated in conjunction with the power steering actuator section (43), there is no need to provide a special means for detecting changes in the steering angle (and there is no need to increase the operational load on the steering wheel (14)). (The operation of the transmission member (56) can be appropriately controlled by changing the steering angle by more than a predetermined value, and stable control operation can be easily obtained with a simple structure.

[Brief explanation of drawings]

Fig. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, Fig. 2 is an overall side view, Fig. 3 is a plan view of the same, Fig. 4 is a side view of main parts, Fig. 5 is a plan view of the same, FIG. 6 is a sectional view of the mission case. (6)... Front wheel (8)... Rear wheel (14)... Steering handle (43)... Power cylinder

Claims (1)

[Claims] In a riding rice transplanter that drives the front and rear wheels, a transmission member is provided that changes the rotational speed of the front wheels so that the rotation speed of the front wheels is higher than that of the rear wheels by changing the steering angle beyond a predetermined value, and the front wheels are also steered in conjunction with the operation of the steering wheel. A traveling device for a riding rice transplanter, characterized in that the speed change member is interlocked and connected to a power steering actuator section.