JP2000170904A - Control working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify sequential operations from the starting of a running brake to stopping, and improve handlability. SOLUTION: A control working vehicle has a driver's seat 12, a working machine 29 elevated by an elevating lever 17, a steering handle 11, a transmission lever 16, a running clutch, and a running brake. The disengagement of the running clutch, resetting the gear to a neutral position, and braking are carried out by the operation of a clutch pedal 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an administrative work vehicle for performing grounding work such as tilling and medium weeding, or ridges and mulching, and transplanting or harvesting of vegetable seedlings.

[0002]

Conventionally, when the traveling clutch is engaged, the traveling speed has a problem that the traveling speed suddenly starts in a forward or reverse state, and the traveling clutch disengagement operation and the traveling braking operation must be performed separately. . Further, when the traveling speed change lever and the elevating lever are separately provided on both sides of the driver's seat, it is necessary to operate each lever by holding the steering handle by hand. In addition, it is necessary to raise the working machine by holding the lifting lever on the lifting side by hand, and there is a problem that the hand cannot be released from the lifting lever until the working machine is raised. In addition, when assembling the traveling transmission lever and the trunnion lever of the hydraulic continuously variable transmission, there is a problem that the neutralization of the trunnion lever is troublesome and the coupling adjustment of each lever cannot be easily performed. In addition, since the hydraulic continuously variable transmission is provided with a hydraulic charge pump exclusively for charging and a hydraulic elevating pump for elevating and lowering the working machine is provided exclusively for elevating and lowering, there is a problem that the manufacturing cost and simplification of the hydraulic structure cannot be easily reduced. is there.
Further, if the front wheels are arranged on the axis extension of the kingpin, the steering wheel operating load is reduced in one turn due to the driving reaction force of the bevel gear during traveling, but is increased in the opposite direction.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a driver's seat on which an operator sits, a work machine which is raised and lowered by a lifting lever, a steering handle, a traveling speed change lever, and a traveling clutch. In a management work vehicle provided with a travel brake, the travel clutch is disengaged and travel shift neutral return and travel braking are performed by operating a clutch pedal.By depressing the clutch pedal, the travel clutch is operated. The traveling shift lever is returned to the neutral position by turning off and further depressing, and the traveling brake is operated and braked by further depressing, so that a series of operations up to stoppage and easy handling can be easily performed. .

In addition, a traveling shift lever and an elevating lever are arranged on the right side of the driver's seat, and while the operator always grips the steering handle with the left hand, each operation of the traveling shift lever and the elevating lever is performed with the right hand. It is possible to easily improve the work efficiency while appropriately maintaining the traveling course.

[0005] Further, since the lifting lever is configured to be held at the lifting operation position, the work machine can be raised even if the operator does not hold the lifting lever at the lifting position, and the direction can be changed on a field headland. The operability can be easily improved.

In addition, the lifting lever is automatically returned to the neutral position when the working machine is raised, so that there is no trouble of returning the lifting lever to the neutral position, and the handling operability is improved, and the function of the lifting structure is improved and simplified. Etc. can be easily performed.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall side view, FIG. 2 is a plan view of the same, and FIG. 3 is an explanatory view of driving. A front axle case (3) is directed right and left via a front case (2) in front of a body frame (1). The front axle case (3) is rotatably supported on the front wheel (4) and the engine (5) and the transmission case (6) are mounted on the rear of the body frame (1). A pair of left and right rear wheels (9) is rotatably supported on both sides via an axle case (7) and a rear axle case (8). Also, the step (1) on the upper side of the body frame (1)
0) Steering handle (11) and driver's seat (12) on the top side
The sun visor (14) is mounted by erecting the support (13), the left and right armrests (15) are fixed on both sides of the driver's seat (12), and the traveling speed change lever ( 16) and an elevator lever (17) and a hydraulic lock lever (18) are arranged, and the driver's seat (12)
A fuel tank (19) and a PTO clutch lever (20) are provided on the left side, a sub-running speed change lever (21) is provided on the front side of the driver's seat (12), and a clutch pedal (22) is mounted on the left side of the step (10). I have. The transmission force of the rear wheel (9) of the transmission case (6) is transferred to the front wheel drive shaft (23).
To the front wheels (4), and
6) By operating the front wheel (4) and the left and right rear wheels (9) of the three-wheel structure
While driving the steering wheel (11) to turn the front wheel (4) left and right to change the traveling course,
Further, when the steering angle of the steering handle (11) becomes larger than a certain value, the inside of turning of the left and right side clutches (24) is automatically disengaged and the driving of the rear wheel (9) inside of turning is stopped,
It is configured to perform a U-turn or the like on a field headland.

A work machine (29) having a rotary pawl (27) and a cultivation plate (28) is provided by attaching a parallel link (26) to a lower part of a front portion of the body frame (1) by fixing a hitch (25). The work machine (29) is mounted on the parallel link (26) in a detachable manner, and is operated by operating the elevating lever (17) to move the working machine (29) up and down from the working position to the non-working position by the hydraulic lifting cylinder (30). ) PTO power is supplied to the working machine (29) by the PTO shaft (31).
, And the rotary pawl (27) is driven to perform medium cultivation soil collecting work. It should be noted that a variety of work machines such as a transplanter or a harvester are exchanged for the work machine (29) to perform various agricultural operations such as transplanting vegetable seedlings or harvesting vegetables.

As is apparent from the above description, the traveling speed change lever (16) and the lift lever (17) are arranged on the right side of the driver's seat (12), and the operator always holds the steering handle (11) with his left hand. Then, each operation of the traveling speed change lever (16) and the elevating lever (17) is performed with the right hand resting on the right armrest (15) so as to improve the work efficiency while appropriately maintaining the traveling course. ing.

Further, a hydraulic stepless transmission (32) is provided in the transmission case (6), and the power of the engine (5) is transmitted by a belt (34) which is stretched via a tension roller type traveling clutch (33). (32), the hydraulic pump (35) and the hydraulic motor (3) of the transmission (32).
The transmission case (6) is provided with a traveling brake (38) for inputting the transmission to the transmission case (6) after the speed change according to (6) and for performing traveling braking by operating the brake arm (37). Further, a hydraulic lift valve (39) switched by the lift lever (17) and a hydraulic lift pump (40) for pumping hydraulic oil of the transmission case (6) to the lift cylinder (30) are provided.
9) and the transmission (3) via the line filter (41).
2) Hydraulic charge circuit (42) and lifting pump (40)
The discharge side is connected, and charge hydraulic pressure is supplied to the transmission (32) by the lifting pump (40). Further, a return oil pipe (43) of the transmission (32) is formed by an oil passage of the case (6), and an air-cooling fan (45) is provided on a charge pump shaft (44) of the transmission (32). )
The conventional charge pump is omitted, and an air cooling fan (4
5) is attached.

As is apparent from the above description, in the administrative work vehicle in which the transmission case (6) is provided with the hydraulic continuously variable transmission (32), the hydraulic lift pump (4) for raising and lowering the work machine (29) is used.
0) to the charge hydraulic circuit (4) of the hydraulic continuously variable transmission (32).
2), the charge hydraulic pressure is supplied from the lifting / lowering pump (40) to the hydraulic continuously variable transmission (32), and the charge pump of the hydraulic continuously variable transmission (32) is omitted, thereby reducing the manufacturing cost and simplifying the hydraulic structure. And an air cooling fan (45) is provided on the charge pump shaft (44) of the hydraulic continuously variable transmission (32).
4) Utilizing an air-cooling fan (45) to cool the transmission case (6) and the hydraulic continuously variable transmission (32) only by adding the air-cooling fan (45), simplifying the structure for preventing oil temperature rise and It is configured to reduce costs.

Further, as shown in FIG. 4, a cylindrical kingpin (46) is rotatably supported on the front case (2), and a gear case (47) is provided below the kingpin (46).
The front axle case (3) is fixed via the steering wheel (11), and the steering shaft (4
8) Connect the king pin (46) to the king pin (4).
6), the gear case (47) and the front axle case (3) are integrally rotated around the kingpin axis (49) by forward / reverse rotation of the steering shaft (48), and the front axle (50) is attached to the front axle case (3). The front wheel (4) to be pivotally supported is turned left and right and the kingpin (4
6) A front wheel drive shaft (23) is connected to the upper end of the input shaft (51) to be loosely inserted into the hollow, and the lower end of the input shaft (51) is connected to the front axle (52) via the bevel gear (52) of the gear case (47). 50) to drive the front wheel (4) to travel and drive the front wheel (4). The front wheel (4) is offset by a fixed distance (A) around the kingpin axis (49) in the direction opposite to the bevel gear (52). The moment generated at the center of the kingpin (46) by the front wheel (4) driving reaction force is offset by the moment generated by the offset front wheel (4) driving force, and the operating force of the steering handle (11) is left and right uniform. In addition, the conventional inconvenience that one operation force of the steering handle (11) is reduced and the other operation force is increased by the driving reaction force of the bevel gear (52) is eliminated.

[0013] Further, as shown in FIG.
A plurality of claw shaft cases (54) are juxtaposed in the left-right direction on the frame (53) of 9), and a rotary claw (27) is attached to each case (54) to form a multi-row tilling structure. Of the PTO input shaft (55) for transmitting power from the PTO shaft (31) in each case (5).
4), the shaft (55) of the case (54) at the side end protrudes only inward, the shaft (55) of the intermediate case (54) protrudes to both sides, and each shaft (55) is connected to the joint shaft. (5
6) and the shaft (5) of the side case (54)
The case (5) is obtained by recombining 5) with an intermediate one.
4) can be added and the number of work ridges can be changed.

As shown in FIGS. 6 to 9, the traveling speed change lever (16) is rotatably provided around a fulcrum shaft (57), and is rotatably mounted on a connecting shaft (58) via a rod (59). And the transmission shaft (58) is connected to the trunnion lever (60) of the transmission (32) via a rod (61), and the trunnion lever (60) is connected to the transmission lever (16). ) Is operated to change the speed of the transmission (32). A neutral lever (62) is rotatably provided around a fulcrum shaft (63), a neutral lever (62) is connected to a travel clutch pedal (22) via a rod (64), and a travel clutch (33) is provided.
Release the clutch wire (65) with the neutral lever (6).
2), a neutral lever (62) is connected to the brake arm (37) via a rod (66), and a neutral return guide (67) for bringing the neutral lever (62) into contact with the connecting shaft (58). ).

Then, as shown in FIG. 9, when the clutch pedal (22) is depressed, the rod (64) is pulled and the neutral lever (62) rotates around the fulcrum shaft (63), and the clutch wire (65) To disengage the traveling clutch (33). Further, when the clutch pedal (22) is further depressed, the neutral lever (62) is pressed against the guide (67), and the traveling speed change lever (16) and the trunnion lever (6) are pressed.
0) is returned to the neutral position, and the transmission (32) output is made neutral. Further, when the clutch pedal (22) is further depressed, the brake arm (37) is operated via the neutral lever (62) and the rod (66), and the brake (38) is operated to brake the running output, and the front and rear wheels are braked. (4) Step (9) is stopped. When the clutch pedal (22) is fully depressed to the end, the lock arm (68) of the clutch pedal (22) is locked by the lock lever (69) shown in FIG. Is locked.

As is apparent from the above description, in the administrative work vehicle provided with the traveling speed change lever (16) and the clutch pedal (22), the operation of the clutch pedal (22) automatically moves the traveling speed change lever (16) to the neutral position. Even if the clutch pedal (22) is returned and then turned on again after the clutch pedal (22) is disengaged, sudden start is prevented by automatic neutral return of the traveling shift lever (16), and simplification of the driving operation and prevention of malfunction due to forgetting the operation are performed. Make up.

A driver's seat (12) on which an operator sits.
And a working machine (2) that is raised and lowered by a lifting lever (17).
9), a steering wheel (11), a traveling shift lever (16), a traveling clutch (33), and a traveling work vehicle provided with a traveling brake (38) are operated by operating a clutch pedal (22). Travel clutch (33)
By performing each operation of disengagement and running neutral return and running braking, and depressing the clutch pedal (22),
When the traveling clutch (33) is disengaged and further depressed, the traveling speed change lever (16) returns to the neutral position, and when further depressed, the traveling brake (38) is actuated and braked. It is designed to improve handling.

Further, as shown in FIG.
2) A neutral positioning body (70) is fixed to the trunnion lever (60), and a positioning shaft (72) is locked and fixed to a hole (71) of the trunnion lever (60) by a pin (73) so as to be freely inserted and removed. ) Is inserted into the hole (74) of the positioning shaft (72), and the trunnion lever (6) is inserted.
0) is fixed to the neutral position of the transmission (32), and the connection length of the rod (61) is changed by loosely tightening the rod (61) and the nut (75) shown in FIG. A) A neutral positioning body (70) is provided in the hydraulic continuously variable transmission (32) operated by the traveling speed change lever (16) so that the neutral position matches the neutral position of the traveling speed change lever (16). The traveling speed can be changed by fixing the trunnion lever (60) connected to the traveling speed change lever (16) to the neutral positioning body (70) detachably and fixing the trunnion lever (60) to the neutral positioning body (70). Lever (16) and trunnion lever (6
The coupling adjustment of 0) is performed so that the neutral output of the hydraulic continuously variable transmission (32) is appropriately maintained with respect to the neutral position of the traveling transmission lever (16).

Further, as shown in FIGS. 10 and 11, the lifting lever (17) is rotatably provided around a fulcrum shaft (76), and the lever (17) is mounted on a spool (77) of a lifting valve (39). And a detent roller (78) rotatably supported at the lower end of the lever (17).
A detent plate (79) is rotatably provided around an axis (80), and the detent plate (79) is elastically pressed against the roller (78) by a spring (81), and a roller is placed on a neutral notch (82) of the detent plate (79). While the lever (17) is neutrally supported by the engagement of the lever (17), the detent plate (79) moves the roller (78) by the raising operation of the lever (17).
To support the lever (17) at the ascending operation position. Further, a feedback link (83) is provided rotatably about a fulcrum shaft (84), and a feedback plate (85) is provided rotatably about a fulcrum shaft (86).
The link (83) is connected to a feedback plate (85) via a feedback wire (87) to move the work implement (29) from a working position to a non-working (lift limit) position on a parallel link (26). Due to the movement, the parallel link (26) near the highest position causes the feedback plate (85) to move.
, The plate (85) is pushed up to pull the wire (87), the link (83) is brought into contact with the lever (17), the lever (17) is returned to the neutral position, and the detent plate (7) is returned.
The lever (17) is neutrally supported by 9).

As is clear from the above, the lifting lever (1
7) is held in the ascending operation position, and even if the operator does not hold the elevating lever (17) in the ascending position, the work machine (29) can be raised to improve the operability such as turning in a field headland. At the same time, the lifting lever (17) is automatically returned to the neutral position by raising the work machine (29), and the lifting lever (17)
The configuration is such that there is no trouble of returning to neutral, and the handling operability is improved, and the function of the lifting structure is improved and simplified.

[0021]

As is apparent from the above embodiment, the present invention is provided with a driver's seat (12) on which an operator sits, and a work machine (29) which is raised and lowered by an elevating lever (17). In the maintenance work vehicle provided with the direction handle (11), the traveling shift lever (16), the traveling clutch (33), and the traveling brake (38), the traveling clutch (33) is disengaged and the traveling speed is changed by operating the clutch pedal (22). When the clutch pedal (22) is depressed, the traveling clutch (33) is disengaged, and when the pedal is further depressed, the traveling speed change lever (16) is moved to the neutral position. Returning to step, further depress the running brake (3
8) operates, brakes and simplifies a series of operations up to stoppage, and can easily improve handling.

The traveling speed change lever (16) and the lift lever (17) are arranged on the right side of the driver's seat (12), and the operator always grips the steering handle (11) with his left hand. With your right hand, run the speed change lever (16) and lift lever (1
Each operation of 7) can be performed, and it is possible to easily improve the work efficiency while appropriately maintaining the traveling course.

Also, the lifting lever (17) is configured to be held at the lifting operation position, and the work machine (29) can be held without the operator holding the lifting lever (17) at the lifting position.
Rise, and it is possible to easily improve the operability such as a change of direction at a headland on a field.

The lifting lever (17) is automatically returned to the neutral position by raising the work machine (29), so that there is no trouble in returning the lifting lever (17) to the neutral position, and the handling operability is improved. In addition, the function of the elevating structure can be easily improved and simplified.

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is a plan view of the same.

FIG. 3 is a drive explanatory diagram.

FIG. 4 is an explanatory view of a front wheel.

FIG. 5 is an explanatory view of a working machine.

FIG. 6 is a side view of the traveling speed change lever.

FIG. 7 is a perspective view of the same.

FIG. 8 is a rear view of the hydraulic continuously variable transmission.

FIG. 9 is a side view of the clutch pedal.

FIG. 10 is a side view of a lifting lever unit.

FIG. 11 is a plan view of the same part.

[Explanation of symbols]

 (11) Steering handle (12) Driver's seat (16) Travel shift lever (17) Lifting lever (22) Clutch pedal (29) Work implement (33) Travel clutch (38) Travel brake

Continued on front page F-term (reference) 2B304 KA08 KA12 LA02 LA06 LA10 LB16 MA02 PA01 PA03 PA04 RA02 RA05 3D040 AA22 AA35 AA37 AB04 AC01 AC50 AC53 AC73 AD06 AD13 AD14 AD18 AE19 AF06 AF07 AF14 3J067 AA11 AB01 AC42 BA04 BB02 BB52 DA03 FA15 FB61 FB90 GA14

Claims (4)

[Claims] 1. A management work vehicle in which a driver's seat on which an operator sits, and a working machine which is moved up and down by an elevating lever are provided, and a steering handle, a traveling shift lever, a traveling clutch, and a traveling brake are provided. A management work vehicle configured to perform each operation of disengaging the traveling clutch, returning to a neutral position during traveling shift, and traveling braking by operating a clutch pedal. 2. The management work vehicle according to claim 1, wherein the traveling speed change lever and the elevating lever are disposed on a right side of a driver's seat. 3. The management work vehicle according to claim 1, wherein the lifting lever is held at a lifting operation position. 4. The management work vehicle according to claim 3, wherein the lifting lever is automatically returned to the neutral position by raising the work machine.