JPH0976930A - Riding management work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a steering control structure and handling operation or the like while preventing a rod or the like forming a steering mechanism from being loaded by an excessive load. SOLUTION: In a riding management work vehicle provided with back and force travelling wheels performing two-wheel steering or four-wheel steering, are provided with a front steering plate 73 to steer left and right front travelling wheels and a rear steering plate 74 to steer left and right rear travelling wheels. The front and rear steering plates 73, 74 are disconnectively interconnected, and a pin 91 to change over the steering to the two-wheel steering or four-wheel steering is slidably inserted into a slot guide 82 so that the steering angle R of the front and rear travelling wheels in the four-wheel steering is regulated by the length on the slot guide 82.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger management work vehicle that travels in a paddy field or a field where rice is grown and sprays chemicals or fertilizers.

[0002]

Conventionally, there is a technique for spraying chemicals by equipping a traveling vehicle equipped with paddy traveling wheels with a spraying work machine, but two-wheel steering or four-wheel steering can be switched freely. In this case, it is necessary to obtain the same turning radius by differentiating the maximum turning angle of the traveling wheels when steering two wheels and the maximum cutting angle of the traveling wheels when steering four wheels. Therefore, a potentiometer is installed in the axle case where the running wheels are mounted, and the maximum turning angle between two-wheel steering and four-wheel steering is detected by the potentiometer, and the steering hydraulic pressure is adjusted so that the turning angle at each steering becomes the respective set angle. By controlling the valve, it is necessary to set both two-wheel steering and four-wheel steering set values with respect to the detected value of the potentiometer, and the control structure and handling operation cannot be simplified easily. There was a problem.

[0003]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in a passenger control work vehicle provided with front and rear traveling wheels for two-wheel steering or four-wheel steering, a front steering plate for steering the left and right front traveling wheels. And a rear steering plate that steers the left and right rear running wheels, and the front and rear steering plates are connected in a disengageable manner so that the pin that switches between two-wheel steering and four-wheel steering can slide on the long hole guide. It is configured so that the cutting angle of the front and rear traveling wheels during four-wheel steering is regulated by the length of the long hole guide. The structure and handling operations can be simplified easily, and since the steering oil pressure is received by the long hole guide end at the time of maximum turning angle operation, an excessive load is applied to the rod forming the steering mechanism. Can be easily prevented and the steering machine Weight and manufacturing cost reduction is intended that the can easily perform such.

Further, since the diameter of the pin connecting the front and rear steering plates and the width of the long hole guide are formed to be substantially equal to each other, it is possible to easily reduce the backlash between the front and rear steering plates due to the pins, and to change the road surface resistance. As a result, it is possible to easily eliminate problems such as vibration of the running wheels and damage to the pins.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a plan view of the elongated hole guide portion, FIG. 2 is a side view of the whole, FIG. 3 is the same plan view, FIG. 4 is a side view of the vehicle body frame portion, and FIG. In the figure, (1) is a traveling vehicle on which an operator rides. The engine (2) is mounted above the front part of the vehicle body frame (3), and the gear reduction case (4) is forwarded via a front axle case (5). While supporting the front running wheels (6), a rear axle case (7) is connected to the rear part of the gear reduction case (4) so that the rear running wheels (8) are supported by the rear axle case (7). A steering handle (10) is attached to the rear of the hood (9) that covers the engine (2) and the like, and the gear reduction case (4) is provided by a vehicle body cover (12) on which an operator rides through step (11). Etc. to cover the vehicle body cover (1
2) Mount the driver's seat (13) on top.

Further, in the figure, (14) is a medicine tank, (1
5) is a spraying work machine equipped with a spreader boom (16) and the like, and includes a top link (17) and a lower link (1).
A hydraulic lifting cylinder for connecting a hitch frame (20) to the rear side of the traveling vehicle (1) via a link mechanism (19) including 8) and raising and lowering a spraying working machine (15) via the link mechanism (19). (21) is connected to the lower link (18), and the front and rear traveling wheels (6) and (8) are driven to travel between rice in the paddy field to continuously perform spraying work. .

Further, in the figure, (22) is the main transmission lever, and (2
Reference numeral 3) is an auxiliary shift lever for lifting and lowering work travel, (24) is a main clutch pedal, and (25) and (25) are left and right brake pedals.

Further, as shown in FIGS. 4 and 5, the engine (2) is mounted on the front portion of the pair of right and left rectangular tubular body frames (3) and (3), and the front axles (26) and (26) are mounted. The front axle case (5) for pivotally supporting the left and right front running wheels (6) (6) via the vehicle body frame (3) behind the engine (2)
(3) Rollably mounted on the lower surface, and provided with a continuously variable belt traveling speed change case (27) between the left and right vehicle body frames (3) and (3) behind the front axle case (5). A gear reduction case (4) is provided between the body frames (3) and (3), and the rear axle (28) (2)
The rear axle case (7) for pivotally supporting the left and right rear running wheels (8) (8) via the left and right body frames (3)
(3) It is fixed to the lower surface of the rear end, and the output of the engine (2) is passed through the cases (27) and (4) to the axle cases (5).
It is transmitted to (7) as traveling driving force, and front and rear traveling wheels (6)
(8) is configured to be driven.

Further, right and left columns (29) and (29) are erected on the upper surfaces of the rear end portions of the left and right body frames (3) and (3), and the upper ends of the left and right columns (29) and (29) are connected by a horizontal frame (30). The pillar (29) and the horizontal frame (30) are integrally fixed to each other to form a portal shape in a front view. Then, between the brake pedal receiving shaft (31) in the middle of the body frame (3) and the middle of the horizontal frame (30), subframes (32) and (32) that tilt forward, rearward, and rearward are installed, and
An elevating cylinder (21) is mounted between the vehicle body frames (3) and (3), and a link mechanism (19) formed by the top link (17) and the lower link (18) is attached to the vehicle body frame (3) and the axle frame (33). Support shaft (34)
Mounted via (35), the linking mechanism (19) is swung by the lifting cylinder (21) to spread the work machine (15).
Is configured to move up and down.

Further, a counter pulley (37) is attached to a front end side of a counter shaft (36) provided below the engine (2), and the engine (2) is provided substantially above the center between the left and right vehicle body frames (3) (3). Of the counter pulley (3).
Is connected to 7). A clutch case (39) is integrally formed on the right front surface of the gear reduction case (4), the right side rear surface of the continuously variable belt traveling speed change case (27) is connected and fixed to the front surface of the clutch case (39), and the lifting cylinder (39 A hydraulic pump (40) for actuating 21) is fixed to the left rear surface of the traveling speed change case (27), and the transmission shaft (41) with a universal joint is connected to the rear end of the counter shaft (36) and the traveling speed change case (27). The engine (2) output is transmitted to the traveling speed change case (27), and the traveling output shaft (42) is provided between the axle cases (5) and (7) and the gear reduction case (4). The shift output of (4) is transmitted to the front and rear traveling wheels (6) and (8) via the axle cases (5) and (7).

Further, the PTO branch case (43) is fixed to the front side of the traveling speed change case (27), and the PTO output case (44) is fixed to the left side of the rear portion of the body frame (3) so that the PTO output case (44) is fixed to the PTO output case (44). PTO axis (4
5) is provided. In addition, a PTO transmission shaft with a universal joint (46) is provided between the cases (43) and (44), and the PTO branch case (just before the driving force of the transmission shaft (41) is input to the traveling transmission case (27). 43) and branched to the PTO transmission shaft (46), and the shaft (4
6) and the PTO output case (44) to drive the PTO shaft (43) to transmit the driving force to the spray pump of the spraying machine (15) via the PTO shaft (43). There is.

Further, as shown in FIGS. 6 and 7, the left and right vertical cases (48) and (48) are fixed to both sides of the horizontal case (47) to form a portal-shaped front axle case (5). (48) (48) is inclined in a V shape when viewed from the front, and the front axle (2) is attached to the outside of the lower end of each case (48) (48).
6) The front running wheels (6) and (6) are pivotally supported via the (26) and (26), and the differential gear case (49) is provided in the substantial center of the horizontal case (47) so that the drive output shaft (42) The driving force is differentially output to the left and right front running wheels (6) (6). In addition, an axle case (5
0) is rotatably connected about a vertical axis, the front axle (26) is pivotally supported by the axle case (50), the lower end side of the knuckle arm (51) is fixed to the axle case (50), and the knuckle is also attached. The upper end of the arm (51) is rotatably connected to the upper end of the vertical case (48), and the vertical case (4
8) The front tie rod (52) is connected to the middle of the knuckle arm (51) that extends substantially parallel to 8). Further, a weeding frame (53) that extends substantially horizontally in the front-rear direction is provided inside the front running wheels (6), and the rear end of the weeding frame (53) is fixed to the axle case (50) and the forward running is performed. A grass body (54) for covering the front side of the ring (6) is provided, and the grass body (54) is provided.
Is fixed to the front end of the weeding frame (53), and the foliage of rice or vegetables in front of the front running wheel (6) is separated from the weeding body (5).
The front running wheel (6) is configured to prevent the front running wheel (6) from stepping on the foliage by the forward movement.

Further, as shown in FIG. 8, the horizontal case (5
5) The left and right vertical cases (56) (56) are fixed to both sides to form a gate-shaped rear axle case (7), and the left and right vertical cases (56) (56) are inclined in a C shape when viewed from the front. The rear axle (28) (2) is provided outside the lower ends of the cases (56) (56).
The rear running wheels (8) and (8) are axially supported via the gears (8), and the differential gear case (5) is provided substantially at the center of the horizontal case (55).
7) is internally provided, and the driving force from the traveling output shaft (42) is differentially output to the left and right rear traveling wheels (8) (8). Further, an axle case (58) is rotatably connected to a lower end portion of the vertical case (56) about a vertical axis, and the axle case (58) is
Support the rear axle (28) on the knuckle arm (59)
The lower end side of the knuckle is fixed to the axle case (58), the upper end side of the knuckle arm (59) is rotatably connected to the upper end of the vertical case (56), and the knuckle extends substantially parallel to the vertical case (56). A rear tie rod (60) is connected to the middle of the arm (59). Further, a diff lock clutch (61) for stopping the differential drive of the left and right rear running wheels (8) (8) is provided in the diff gear case (57) part, and a diff lock lever (62) is attached to the left and right rear running wheels (8). 8) Left and right traveling brakes (6)
3) and (63) are provided on both sides of the differential gear case (57), and brake levers (64) and (64) connected to the left and right brake pedals (25) and (25) are attached.

Further, as shown in FIGS. 9 and 10, a hydraulic steering valve (65) which is switched by the steering handle (10), a hydraulic lifting valve (66) which is switched by the auxiliary shift lever (23), and a right valve. A hydraulic steering cylinder (67) attached to the lower surface of the body frame (3) is provided, the horizontal case (55) of the rear axle case (7) is used as a hydraulic oil tank, and the hydraulic pump (40) is provided with a high pressure oil pipe (6).
8) The valves (65) and (66) are provided in series via (69), the elevating valve (66) is disposed on the downstream side, and the oil pipes (70) (7) are provided by switching the steering valve (65).
The steering cylinder (67) is operated via 1), and when the steering valve (65) is neutral, the lifting valve (6)
The lifting cylinder (21) is operated via the oil pipe (72) by switching 6).

Further, FIG. 11, FIG. 12, FIG. 13, FIG.
As shown in FIG. 7, a front steering plate (73) for steering the front traveling wheels (6), a rear steering plate (74) for steering the rear traveling wheels (8), and a front-rear steering plate (73). ) (74), which engages and disengages the engaging plate (75), and front and rear steering plates (73) (7).
4) A base plate (76) for mounting the front and rear steering plates (7) is provided.
3) (74), engagement plate (75) and base plate (76)
The fulcrum shaft (77) is fixed to the base plate (76) and the front and rear steering plates (7) are arranged on the pedestal shaft (77).
3) The (74) is rotatably supported, the steering plates (73) and (74) are superposed on and under the base plate (76), and the rear steering plate (74) is supported by the support shaft (78). And rotatably connect the engaging plate (75), and attach the engaging plate (75) overlapping the upper surface of the rear steering plate (74) between the front steering plate (73) and the base plate (76) so that the engaging plate (75) can freely move in and out. There is.

A steering cylinder (67) controlled by operating the steering handle (10) is connected to the front steering plate (73), and the front drag rod (79) is connected to the front steering plate (73).
The knuckle arm (51) of the front axle case (48) is connected to the rear steering case (48) via the rear drag rod (80) to the knuckle arm (59) of the rear axle case (56). Let On the other hand, the electric switching cylinder (81) for switching between two-wheel steering and four-wheel steering is connected to the engagement plate (75), and the arc-shaped elongated hole guide (82) for guiding the engagement plate (75) is attached to the base plate ( 76). The cylinder (81) may be a hydraulic cylinder.

An electric switching motor (83) is attached to the switching cylinder (81) so that the cylinder (81) is connected to the right vehicle body frame (3) via the shaft (84) and the vehicle body frame (3) is connected. The center of the switching link (86) is rotatably supported by the shaft (85), and the link (86)
A piston (87) of the cylinder (81) is connected to one end, and the other end of the link (86) and the engagement plate (75) are extended and contracted by a compression spring (88).
Connect by (90).

The guide (82) has a fulcrum shaft (7
7) A lock pin (91) which is formed on the circumference of the center and is movably inserted into the guide (82).
Is fixed to the engaging plate (75), and the interlocking notch (92) for engaging the lock pin (91) is formed in the front steering plate (73), and the front and rear is provided via the engaging plate (75) and the pin (91). Steering plates (73) (74) are integrally fixed, and each steering plate (73) is fixed.
The lock notch (9) into which the lock pin (91) is engaged while the (74) is integrally rotated around the fulcrum shaft (77).
3) is formed on the guide (82) and the lock notch (93) is formed.
The rear steering wheel (8) (8) is maintained in a straight-ahead posture by engaging the pin (91) with the base plate (76) and fixing the rear steering plate (74) to the base plate (76). ) Of the piston (87), the pin (91) is selectively engaged with the interlocking notch (92) or the lock notch (93),
Two-wheel steering of front running wheels (6) (6) and front and rear running wheels (6)
(6) (8) It is configured to switch to (8) four-wheel steering.

Further, the base plate (76) is fixed to the right side surface of the right body frame (3) on which the traveling wheels (6) (8) are mounted,
The base plate (76) is attached substantially horizontally, and the right body frame (3)
The base plate is mounted using the unused space on the right side, and as shown in FIG. 15, the two-wheel and four-wheel steering switches (94) (95) for detecting the switching of the engagement plate (75) and the engagement plate. A two-position switch type switch lever (96) for switching (75) to two-wheel steering or four-wheel steering is provided, and the switch lever (96) is attached to the bonnet (9) near the steering handle (10). Then, the switch lever (96) is operated by a worker sitting on the driver's seat (13).
Is switched to the four-wheel steering side, the power source (98) is applied to the motor (83) via the normally closed contact of the switch (95) and the forward rotation relay (97), and the piston of the switching cylinder (81) ( 87) and push the pin (91) into the notch (9
2), connect each steering plate (73) (74), switch the switch (95) with the pin (91),
The normally open contact of the switch (95) is turned on, and the four-wheel steering display is performed by turning on the lamp (99). Further, when the switch lever (96) is switched to the two-wheel steering side, the power source (98) is applied to the motor (83) via the normally closed contact of the switch (94) and the reverse rotation relay (100), and the switching cylinder ( The piston (87) of 81) is withdrawn and the pin (9)
1) is engaged with the notch (93), the rear steering plate (74) is fixed to the base plate (76), and the switch (94) is attached to the pin (9).
1), the normally open contact of the switch (94) is turned on, and the two-wheel steering display is performed by turning on the lamp (101).

Further, as is clear from the above description and FIG. 1, in the passenger management work vehicle in which the front and rear traveling wheels (6) and (8) for two-wheel steering or four-wheel steering are provided, the left and right front traveling wheels ( 6) A front steering plate (7) for steering the (6)
3) and a rear steering plate (74) for steering the left and right rear running wheels (8) (8), and front and rear steering plates (73) (74)
A pin (91) for connecting to and detaching from each other to switch between two-wheel steering and four-wheel steering is slidably inserted into the long hole guide (82), and the front and rear traveling wheels (6) ( The turning angle (R) of 8) is regulated by the length of the long hole guide (82), and a potentiometer or the like for detecting the steering operation of the running wheels (6) (8) is not required and the steering control structure and the handling operation are performed. The diameter of the pin (91) connecting the front and rear steering plates (73) (74) and the width (S) of the elongated hole guide (82) are formed to be substantially equal to each other, and the pin (91) is It is configured to reduce the backlash between the front and rear steering plates (73) (74).

Further, as shown in FIGS. 8, 16 and 17, the lower frame is provided substantially parallel to the body frame (3) below the body frame (3) and between the front and rear axle cases (5) and (7). (102) is extended. Then, the front and rear bearing bodies (103, 104) are fixed to the upper surface of the body frame (3), and the front axle case (5) is rotatably supported by the front and rear bearing bodies (103, 104). (103) Bolt (105) on the lower side of (104)
The front end side of the lower frame (102) is fixed via the (105), the bearing bodies (103) (104) are reinforced by the lower frame (102), and the cover frame is provided below the outer peripheral edge of the vehicle body cover (12). The step frame (107) having the step (11) extended and the step (11) provided on the lower end side is fixed to the cover frame (106), and the auxiliary frame (108) provided in the middle of the step frame (107) is the lower frame. (102) The lower frame (102) and the step frame (107) are connected to each other in the middle to reinforce each other. Further, the split surface joining flange of the horizontal case (55) forming the rear axle case (7) is extended downward to integrally form the frame mounting seat (109), and the frame mounting seat (109) is provided with a bolt ( 110) through the lower frame (102)
The rear frame (7) whose rear end is fixed and whose upper surface side is fixed to the vehicle body frame (3) is attached to the lower frame (102).
The rear axle case (7) does not need to be specially provided with a member forming a seat for connecting the lower frame (102), and the frame is formed by utilizing the split surface joining flange of the horizontal case (55). Mounting seat (109)
Since the flange is formed, the mounting seat (1
09) can be processed.

[0022]

As is apparent from the above embodiments, the present invention provides the front and rear traveling wheels (6) for two-wheel steering or four-wheel steering.
In the passenger management work vehicle provided with (8), a front steering plate (73) for steering the left and right front running wheels (6), (6),
A rear steering plate (74) for steering the left and right rear traveling wheels (8) (8) is provided, and the front and rear steering plates (73) (74) are detachably connected to each other to control two wheels or four wheels. The pin (91) for switching to steering is slidably inserted into the long hole guide (82),
It is configured such that the turning angle (R) of the front and rear running wheels (6) (8) during four-wheel steering is regulated by the length of the long hole guide (82). It is possible to simplify the steering control structure and handling operations without the need for a potentiometer to detect the direction movement.
Guides the steering oil pressure to the long hole guide (8
2) Since it is received by the end portion, it is possible to easily prevent an excessive load from being applied to the rods (79) (80) forming the steering mechanism, and it is possible to easily reduce the weight of the steering mechanism and reduce the manufacturing cost. Is something that can be done.

Further, the diameter of the pin (91) connecting the front and rear steering plates (73) (74) and the width (S) of the elongated hole guide (82) are formed to be substantially equal to each other. It is possible to easily reduce the backlash between the front and rear steering plates (73) and (74), and it is easy to cause problems such as the running wheels (6) and (8) vibrating or the pins (91) being damaged due to changes in road surface resistance. It can be lost.

[Brief description of drawings]

FIG. 1 is a plan view of a long hole guide portion.

FIG. 2 is an overall side view.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of a body frame portion.

FIG. 5 is a plan view of the same.

FIG. 6 is a front view of a front axle case portion.

FIG. 7 is a plan view of a front portion of front traveling wheels.

FIG. 8 is a rear view of the rear axle case portion.

FIG. 9 is a side view of hydraulic piping.

FIG. 10 is a plan view of the same.

FIG. 11 is a plan view of a steering mechanism.

FIG. 12 is an exploded explanatory view of the same.

FIG. 13 is a plan view of the front-rear steering plate section.

FIG. 14 is a rear view of the front-rear steering plate portion.

FIG. 15 is an electric circuit diagram of a switch lever.

FIG. 16 is a side view of a lower frame portion.

FIG. 17 is a plan view of the same portion.

[Explanation of symbols]

 (6) Front running wheel (8) Rear running wheel (73) Front steering plate (74) Rear steering plate (82) Long hole guide (91) Lock pin

Claims (2)

[Claims] 1. In a passenger control work vehicle having front and rear traveling wheels for two-wheel steering or four-wheel steering, a front steering plate for steering left and right front traveling wheels and a left and right rear traveling wheel for steering. A rear steering plate to be operated is provided, and the front and rear steering plates are connected in a disengageable manner, and a pin for switching between two-wheel steering and four-wheel steering is slidably inserted into the long-hole guide. A passenger management work vehicle characterized in that the corners of the front and rear traveling wheels are regulated by the length of the long hole guide. 2. A passenger management work vehicle, wherein a diameter of a pin connecting the front and rear steering plates and a width of the long hole guide are formed to be substantially equal to each other.