JP2000172356A - Maintenance vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sudden start, to simplify driving and to prevent a malfunction due to an operating omission respectively for a maintenance vehicle by resetting automatically a gear shift lever at its neutral position via the operation of a clutch pedal. SOLUTION: When a clutch pedal 22 is stepped on, a rod 64 is pulled and a neutral lever 62 is revolved around a fulcrum shaft 63 to pull a clutch wire 65 and to cut off a clutch. When the pedal 22 is further stepped on, the lever 62 is pressed to a guide 67 to reset a gear shift lever 16 and a trunnion lever 60 at their neutral positions and to secure the neutral output of a speed change gear. Then a brake arm 37 is operated via the lever 62 and a rod 66 when the pedal 22 is further stepped on, and brakes are applied to the output and to stop the front and rear wheels. When the pedal 22 is stepped on to the end through all strokes, a lock arm 68 is locked by a lock lever and the pedal 22 is locked in a parking brake state.

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 The present invention is directed to a management work vehicle provided with a traveling shift lever and a clutch pedal, wherein the traveling shift lever is automatically returned to a neutral position by operating the clutch pedal. Even if the clutch pedal is operated again after the clutch pedal is released, sudden start can be easily prevented by the automatic return of the traveling shift lever, and the driving operation can be simplified and malfunctions due to forgetting to operate can easily be prevented. .

Further, a neutral positioning body is provided in a hydraulic continuously variable transmission operated by a traveling speed change lever, and a trunnion lever connected to the traveling speed change lever is detachably fixed to the neutral positioning body. By fixing the traveling speed change lever to the trunnion lever by fixing the traveling speed change lever and the trunnion lever, the neutral output of the hydraulic continuously variable transmission can be appropriately maintained with respect to the neutral position of the traveling speed change lever.

[0005]

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) by fixing a hitch (25) below the front part of the body frame (1). 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 elevating lever (17) are disposed on the right side of the driver's seat (12), and the operator always holds the steering handle (11) with the 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 continuously variable 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 hydraulic continuously variable transmission (32) is provided in the transmission case (6), 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.

[0011] 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.

Further, 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 connection 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 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 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 elevating lever (17) is rotatably provided around a fulcrum shaft (76), and the lever (17) is mounted on a spool (77) of an elevating 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.

[0019]

As is apparent from the above embodiments, the present invention provides a traveling speed change lever (16) and a clutch pedal (2).
In the administrative work vehicle provided with 2), the traveling speed change lever (16) is automatically returned to the neutral position by the operation of the clutch pedal (22). However, sudden start can be easily prevented by the automatic neutral return of the traveling speed change lever (16), and the driving operation can be simplified, and malfunctions due to forgetting to operate can be easily prevented.

Further, a neutral positioning body (70) is mounted on the hydraulic continuously variable transmission (32) operated by the traveling speed change lever (16).
And a trunnion lever (60) connected to the traveling speed change lever (16) can be detachably fixed to the neutral positioning body (70).
0) is fixed to the neutral positioning body (70), so that the traveling speed change lever (16) and the trunnion lever (6) are fixed.
0) can be easily adjusted, and the hydraulic continuously variable transmission (32) can be easily moved relative to the neutral position of the traveling speed change lever (16).
The neutral output can be properly maintained.

[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]

 (16) Travel shifting lever (22) Clutch pedal (32) Hydraulic continuously variable transmission (60) Trunnion lever (70) Neutral positioning body

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) B60K 23/02 B60K 23/02 J 3D041 R 3J053 41/22 41/22 3J070 41/28 41/28 F16H 61 / 42 F16H 61/42 H G05G 5/06 G05G 5/06 CF term (reference) 2B033 AA03 AB01 AB12 AB17 AC05 BA01 BB02 CA21 2B034 AA02 AA07 BA06 BB02 BC06 BD08 EA11 HA02 2B062 AA02 AA14 AB10 DA07 BA22 BA24 CA12 DA15 DC01 DC02 DD01 DD02 EB03 3D036 EB02 EB15 EC02 EC23 EC24 3D041 AA11 AA15 AA72 AA74 AB05 AC06 AC22 AC26 AD20 AE14 AE33 AE41 AF00 3J053 AB04 DA21 DA28 FC02 3J070 AA03 AA32 BA09 CA42 CC04 DA03

Claims (2)

[Claims] An administrative work vehicle provided with a traveling shift lever and a clutch pedal, wherein the traveling shift lever is automatically returned to a neutral position by operating the clutch pedal. 2. The hydraulic continuously variable transmission operated by the traveling speed change lever is provided with a neutral positioning body, and a trunnion lever connected to the traveling speed change lever can be detachably fixed to the neutral positioning body. Item 2. The management work vehicle according to Item 1.