JP2002325504A - Tending operation vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tending operation vehicle with which the horizontality of an implement in the tending operation vehicle is retained and a favorable operation can be carried out. SOLUTION: In this tending operation vehicle having a constitution in which the tending operation vehicle is equipped with a parallel link mechanism for supporting the implement, the link mechanism is furnished with a front hitch and at a position opposing to the front hitch, the link mechanism is equipped with a rear hitch to be connected to the link mechanism through a rolling shaft arranged in the longitudinal direction of the tending operation vehicle and the implement is installed connectably to the rear hitch, the rear hitch is relatively rotated from the front hitch in the approximately vertical plane and the tending operation vehicle is equipped with a horizontality retention mechanism for keeping the level of the implement constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a management work vehicle equipped with a work machine. In particular, the present invention relates to a horizontal holding mechanism and a horizontal control mechanism for horizontally supporting a working machine.

[0002]

2. Description of the Related Art A management work vehicle for performing management work such as middle tillage, weeding, and fertilization in a field is equipped with a work machine, and the work is performed by the work machine. The working machine is
The parallel link mechanism enables the working machine to be moved up and down while maintaining a certain angle. However, when performing a multi-management operation, the conventional managed work vehicle has not been provided with a mechanism for maintaining the level of the work machine, although the width of the work machine is increased. Therefore, there is a problem that the work machine cannot sufficiently follow the ground or the ridge when the body of the management work vehicle is tilted. Some work machines have been conventionally provided with a horizontal control mechanism. However, the work machines need to be attached to each work machine, which raises costs and increases the size of the work machine.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to solve these problems. The task is to provide a management work vehicle.

[0004]

In order to solve the above-mentioned problems, the present invention has the following features. That is, a management work vehicle provided with a work machine for performing management work in a field or the like, the management work vehicle having a parallel link mechanism that supports the work machine, and a front hitch disposed on the link mechanism. A rear hitch is provided at a position facing the hitch and connected via a rolling shaft provided in the front-rear direction of the management work vehicle. And
In a configuration in which a work machine is connected to the rear hitch, the rear hitch rotates relative to the front hitch in a substantially vertical plane, and a management work vehicle provided with a horizontal holding mechanism for keeping the work machine horizontal.

Further, a horizontal control mechanism including a rolling cylinder for changing the rear hitch so that the working machine is at a horizontal position and a horizontal sensor for detecting a horizontal position may be provided together with the horizontal holding mechanism. Here, the rolling cylinder and the horizontal sensor may be disposed at positions facing each other with the rolling axis interposed therebetween.

In a configuration in which the management work vehicle travels on three wheels, at least one of the horizontal holding mechanism and the horizontal control mechanism may be disposed substantially inside the three wheels. Further, in a configuration in which the management work vehicle includes one wheel on a front wheel and two wheels on a rear wheel,
At least one of the horizontal holding mechanism and the horizontal control mechanism may be disposed immediately behind the front wheel.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an overall side view of the management work vehicle, FIG. 2 is a plan view of the same, and FIG. 3 is an explanatory diagram of power transmission. Body (1)
A front axle case (3) is provided on the front part of the front body frame (1a) via a front case (2) so as to be able to change its direction from side to side. A front wheel (4) is rotatably supported on the front axle case (3), and an engine (5) and a transmission case (6) are mounted on the vehicle body (1).
Is mounted on the rear part of the rear body frame (1b). A pair of left and right rear wheels (9) are rotatably supported on both sides of the transmission case (6) via an axle case (7) and a rear axle case (8). Also, a steering handle (11) and a driver's seat (12) are provided on the upper surface of the step (10) on the upper side of the rear body frame (1b), and a pair of right and left columns (13) is erected to provide a sun visor (14). ) And the left and right armrests (1) on both sides of the driver's seat (12).
5) is fixed.

An HST main shift lever (16), a work implement elevating lever (17), and an accelerator lever (1) protruding from the right side of the steering column are provided at the front right side of the driver's seat (12).
8), and a PTO lever (20) is also arranged on the right rear portion. A fuel tank (19) is located on the left side of the driver's seat (12).
In addition, an auxiliary traveling speed change lever (21) is provided in front of the driver's seat (12), and a traveling clutch pedal (22) is attached to the left front part of step (10). And
The traveling drive force of the transmission case (6) is transmitted to the front wheel drive shaft (2).
3) to the front wheel (4), the HST main shift lever (16) is operated to drive the front wheel (4) and the left and right rear wheels (9) of the three-wheel structure, and the front wheel is operated by the steering wheel (11). (4) Turn left and right to change the traveling course. When the steering angle of the steering handle (11) becomes larger than a certain value, the left and right side clutches (24)
Is automatically turned off to stop driving the rear wheel (9) on the inside of the turn and perform a U-turn or the like on the paddy field.

Also, a work machine (29) having a rotary pawl (27) and a cultivation plate (28) is provided by attaching a parallel link (26) with a hitch (25) fixed to the front lower side of the front body frame (1a). The work machine (29) is removably attached to the parallel link (26), and the work machine lift lever (17) is operated to raise and lower the work machine (29) to a working position or a non-working position by a hydraulic lifting cylinder (30). The PTO power of (6) is transmitted to the working machine (29) by the PTO shaft (31), and the rotary pawl (27) is driven to perform the medium tilling operation. In addition, various farming operations such as transplanting of vegetable seedlings or harvesting of vegetables are performed by exchanging various working machines such as a transplanting machine or a harvesting machine with the working machine (29).

Further, since the HST main speed change lever (16), the work implement elevating lever (17) and the PTO lever (20) are arranged on the right side of the driver's seat (12), when getting on and off from the left side of the main body, There is no trouble such as the operation lever being stuck, and after riding, the operator always holds the steering wheel knob (11a) on the left side of the steering handle (11) with the left hand to perform the steering operation while using the HST main shift lever ( 16), the operation of the work implement elevating lever (17) and the PTO lever (20) is performed to improve the work efficiency while appropriately maintaining the traveling course.

The transmission case (6) is provided with a hydraulic stepless transmission (32), 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) that is input to the transmission case (6) after the speed is changed according to (6), and is braked by operating the brake arm (37).

Next, the driving mechanism of the front wheel (4) will be described. As shown in FIG. 4, a cylindrical kingpin (39) is rotatably supported by the front case (2), and a front axle case (3) is fixed below the kingpin (39) via a gear case (40). . Further, a kingpin (39) is connected to a steering shaft (41) which is operated to rotate forward and reverse by a steering handle (11), and the kingpin (39), the gear case (40) and the front axle case (3) are connected to the steering shaft (41). ) Is integrally rotated about the axis of the king pin (39). The front wheel (4), which is supported by the front axle case (3) via the front axle (42), is turned left and right, and a front wheel drive is mounted on the upper end of the input shaft (43) through which the kingpin (39) is loosely inserted. The shaft (23) is connected, the lower end of the input shaft (43) is connected to the front axle (42) via a bevel gear (44) of a gear case (40), and the front wheel (4) is driven to travel. Then, the steering pin (4
By decelerating the worm (45) connecting the first steering wheel (1), the front wheel (4) in the straight traveling position is turned left and right by about 90 degrees by three rotations of the steering handle (11).

A single front wheel (4) is mounted at the front center of the vehicle body (1), and a pair of left and right rear wheels (9) are mounted on both rear sides of the vehicle body (1). The front wheel drive shaft (23) for driving the front wheel (4) is connected to the drive input side of the clutch (24). As a result, the front wheels (4) are driven to change directions regardless of the driving state of the left and right rear wheels (9), thereby improving driving operability. At the same time, the left and right side clutch pedals (46) are arranged below the front part of the driver's seat (12) on which the operator sits, and the steering handle (1
1) A side clutch pedal (46) is provided away from a general position below the side. This configuration prevents the brake pedal from being mistakenly recognized as a brake pedal in normal working conditions and being operated incorrectly.
The operator operates the side clutch pedal (46) properly while recognizing it. The operator releases the left and right side clutch pedals (46) in the width direction of the round steering handle (11) in front of the driver's seat (12). In order to prevent erroneous operation due to erroneous recognition of the left and right side clutch pedals (46), the driving of the left and right rear wheels (9) is stopped while being appropriately selected.

A handle knob (11a) is provided outside the round steering handle (11), and the handle knob (11) is provided.
a) is provided on the left side of the center in the body width direction when traveling straight, is operated with one hand using the handle knob (11a) reliably with a smaller operating force than the normal handle operation, and the HST main speed change lever with the right hand. (16) While operating the work machine lifting lever (17) or the PTO lever (20), the handle (11) is rotated by the handle knob (11a) with only the left hand to improve the driving operability, and A column (13) for forming a space at the lower front part of the column (13) larger than the space between the upper columns of the left and right columns (13) surrounding the upper part of the seat (12), and for mounting a sun visor (14) and the like.
The driver's seat (1
The front of the column (13) is disposed outside the field of view of the worker in 2) to simplify the mounting structure of the sun visor (14) and to improve the driving operability.

The torque generator (50) includes a steering valve (47) switched by a steering handle (11) and a hydraulic steering motor (not shown) for driving a steering shaft (51). A hydraulic pump (48) driven by (5) and an elevating valve (49) for operating an elevating cylinder (30) are provided.
8) A lifting valve (49) via a steering valve (47)
Are connected hydraulically in series, and by operating the steering handle (11), the steering valve (47) is switched to rotate the steering motor (not shown) in the normal direction by the rotation angle of the steering handle (11). The output shaft is rotated in conjunction with the hydraulic pressure to change the direction of the front wheel (4) to the left or right, while the work machine lift lever (17) is operated to switch the lift valve (49) to operate the lift cylinder (30). Let the work machine (2
9) is raised and lowered between the front wheel (4) and the rear wheel (9).

As is apparent from the above configuration, the working machine (29) is mounted on the front of the vehicle body (1) via the link mechanism (26) and the elevating cylinder (30), and the driver's seat (12) and the steering are provided. In an administrative work vehicle in which a handle (11), an engine (5), and a transmission case (6) are attached to a rear portion of a vehicle body (1), an elevating valve (49) for controlling an elevating cylinder (30) and a work implement elevating lever (17) Is provided at the rear of the vehicle body (1), and a link mechanism (2) at the front of the vehicle body (1) is provided.
6) and the lifting valve (49) at the rear of the vehicle body (1) are connected by a feedback wire (not shown), and the amount of vertical movement of the link mechanism (26) is detected by the feedback wire to return the lifting valve (49) to the neutral position. Then, the lifting amount of the work machine (29) is made to coincide with the operation amount of the lifting lever (17), thereby improving the lifting function of the working machine (29) and simplifying the lifting structure.

As described above, the PTO lever is provided in the control work vehicle in which the work machine is mounted on the front of the vehicle body via the link mechanism and the lifting cylinder, and the driver's seat, the steering wheel, the engine, and the transmission case are mounted on the rear of the vehicle body. Since the operating levers such as the accelerator lever, the HST main shift lever, and the work implement elevating lever are disposed on the right side of the center in the machine body width direction, troubles such as the operating lever being stuck when getting on and off from the left side of the machine body do not occur. Also, after boarding, each lever can be operated with the right hand, especially when turning the aircraft, a series of operations until deceleration, lifting of the work machine, driving stop of the PTO can be operated with only the right hand, and the steering handle is the left hand. Since there is no need to change hands only by operation, it contributes to improvement of work efficiency while maintaining the traveling course properly. Furthermore, since the steering wheel is provided with the knob, reliable driving operability can be obtained by one-handed operation. In addition, the steering wheel knob is located on the left side of the center in the body width direction when traveling straight, so by operating the knob on the left-handed handle only, it is possible to further improve the work efficiency while maintaining the traveling course properly. Contribute.

Next, the horizontal holding mechanism and the horizontal control mechanism of the working machine (29) according to the present invention will be described in detail. In the present embodiment, these mechanisms are disposed substantially inside three wheels (4), (9), and (9) provided in the management work vehicle, and effectively support the management work vehicle. FIGS. 5 to 7 are a front sectional view, a side view, and a plan view of members related to the link mechanism (26), the horizontal holding mechanism, and the horizontal control mechanism, respectively. Further, FIG. 8 is an exploded side view of the front hitch (60) and the rear hitch (61) showing the main parts of the present invention. The link mechanism (26) includes an upper link (62) in which ladder-like members are laid in parallel in the front-rear direction, and a lower link (6).
3). The front ends of the links (62) and (63) are rotatably mounted on the hitch (25) through the shafts (64) and (65) through the bearings (62a) (62a) (63).
a) (63a) is provided. Further, at the rear end of the upper link (62), front hitch receiving portions (62b) (62b) (66) rotatably supporting convex portions (66) (66) protruding left and right from the upper portion of the front hitch (60). 62b).
At the rear end of the lower link (63), together with the bearings (67) and (67) of the front hitch (60), the rotating shaft (6) is rotatably mounted.
8) through the shaft.

With these configurations, the upper link (62) and the lower link (63) are rotated while maintaining the parallel state, so that the front hitch (60) can be moved up and down substantially vertically. become. Conventionally, a work machine is attached to a hitch portion before the work, and the work machine is moved up and down in a state in which the angle of the work machine is fixed, thereby switching between work and non-work. However, since the maintenance work vehicle travels in highly uneven fields, etc., there is a case that the work vehicle does not parallel to the ground in the conventional configuration, and the work machine may not be able to perform appropriate work. I was

Therefore, in the present invention, the rear hitch (61) is disposed immediately after the front hitch (60), and the rear hitch (6) is provided.
1) is provided so as to be rotatable relative to the front hitch (60) and provided with a horizontal holding mechanism, and a horizontal control mechanism including a rolling cylinder (69) and a horizontal sensor (70) is provided on the rear hitch (61). It is arranged to solve the above problem. The front hitch (60) has a substantially flat plate portion (60a) disposed substantially vertically in the left-right direction of the work machine (29), and left and right end surfaces extending substantially vertically rearward at the left and right ends. It is a member having a U-shape in plan view (FIG. 7).

A rolling cylinder fixing member (71) for fixing the lower part of the rolling cylinder (69) protrudes from the left end face (60b), and its plan view (FIG. 7).
Rolling cylinder (6
9) is sandwiched. On the other hand, a potentiometer fixing member (7) in which a potentiometer (72) for detecting the angle of the front hitch (60) is disposed on the right end face (60c).
3). Further, a rolling shaft support portion (75) that supports the rolling shaft (74) is provided at the lower center portion of the substantially flat plate portion (60a). The shaft support (75) is formed by cutting out the lower end of the substantially flat plate (60a) in a semicircular shape and welding a circular pipe having the same radius to the cutout.

A member opposed to the front hitch (60) via the rolling shaft (74) loosely fitted to the front hitch (60) is the rear hitch (61). The rear hitch (61) includes a substantially flat plate portion (61a) disposed substantially vertically in the left-right direction, and left and right end portions (61b) (61c) extending substantially vertically toward the front. The right end face portions (61b) and (61c) include a portion extending forward of the substantially flat plate portion (61a) and a portion in which the U-shape is directed sideways above the substantially flat portion (61a) as viewed from the side (FIG. 6). . Here, the reason why the frame is formed in a U-shape is that a frame (76) extending in the left-right direction of the work machine fits into the opening. With this configuration, it is possible to save space while disposing the horizontal holding mechanism.

Therefore, the rear hitch is mounted on the rolling shaft (7).
The substantially flat portion (60a) of the front hitch (60) and the substantially flat portion (61a) of the rear hitch (61) are configured to be rotatable around 4) while maintaining parallel to each other. A U-shaped rolling cylinder fixing member (77) projects from the left side surface (61b) of the rear hitch (61) and sandwiches the upper part of the rolling cylinder (69) in plan view (FIG. 7). On the other hand, a horizontal sensor mounting table (78) for mounting the horizontal sensor (70) is attached to the right side (61c), and the horizontal sensor (70) detects whether the rear hitch (61) is horizontal or not. I have. Here, since the horizontal sensor (70) and the rolling cylinder (69) are arranged on both sides of the rolling shaft (74), it contributes to the improvement of the balance between left and right.

With the above configuration, based on the angle of the front hitch (60) detected by the potentiometer (72), the front hitch (60) and the rear hitch (61) for the rear hitch (61) to become horizontal. ) Is calculated, and the rolling cylinder (69) is driven to drive the rear hitch (61).
Is rotated about the rolling axis (74). At the same time, the level of the actual rear hitch (61) is checked by the horizontal sensor (70), and the rear hitch always keeps the horizontal level.

At the rear end of the rear hitch (61), a work machine (2
9) and a hook (79) (79) for connecting the work machine (2).
Connection shaft (80) (80) for fixing the shaft by passing through the shaft 9)
Is provided. As a result, the work equipment (29) is also held horizontally by the rear hitch (61) which is controlled horizontally, and the work equipment (2) which has been a problem in the conventional management work vehicle.
The inclination of 9) can be eliminated.

Further, the management work vehicle according to the present invention can be provided with a grooving machine. FIG. 9 is a side view of the vicinity of the rear axle case (8) provided with the groove cutting machine, and FIG. 10 is a plan view of the same. In the latter half of the final case (81) of the rear axle case (8), a shaft support member (84) that rotatably supports a fulcrum shaft (83) of a lifting arm (82) for raising and lowering a grooved plate (not shown). Is attached. The shaft support (8
4) bolt (85) to final case (81)
(85) A fixing part (84a) fixed by (85) and (85) and formed along the circumference of the final case (81).
And a guide portion (84b) that has a fulcrum shaft (83) inside the management work machine and guides the lifting arm (82) up and down.

The elevating arm (82) connects the tip of the wire receiving member (86) projecting from the middle thereof to the wire (88) via a spring (87), and pulls the wire (8). By doing so, I try to go up and down. Further, a spring receiving member (90) is provided near the wire receiving member (86). One end of a spring (89) that assists in raising the elevating arm (82) is connected. Spring (8
The other end of 9) is fixed to the upper part of the guide part (84b).

The grooving plate has a rectangular plate and a support at its end, and a support member (91) for supporting the support is disposed at the rear end of the lifting arm (84). As a result, when the lifting arm is moved up and down, the groove cutting plate is moved up and down, and when used, it can be lowered to cut the groove. According to this configuration, since the lifting fulcrum of the groove cutting machine can be set at a position lower than the ground, the lifting arm can be shortened, and the load when the groove cutting machine is used can be reduced. by this,
The life of the member can be prolonged. At the same time, the amount of wire drawn in can be raised at least sufficiently, so that it is possible to securely store the grooving machine when not in use.

Further, the present configuration comprises a groove cutting plate and a lifting arm (8
2) A shaft support (83) for supporting the lifting arm and a wire receiving member (86) are integrally formed, and bolts (8) are formed.
5) Since it is fixed by (85), (85) and (85),
It is easy to put on and take off, and contributes to improvement of the assemblability.

[0030]

The management work vehicle of the present invention has the above-described configuration, and thus has the following effects. According to the management work vehicle of the first aspect, in addition to the conventional parallel link mechanism, it is possible to provide a horizontal holding mechanism for keeping the level of the work machine constant, so that management work with high work efficiency while suppressing costs. Cars can be provided.

According to the control work vehicle of the second aspect, since the horizontal control mechanism including the rolling cylinder and the horizontal sensor is provided, accurate horizontal control can be realized, and the horizontal control capable of obtaining an agile response by the rolling cylinder can be realized. And can contribute to the reduction of manufacturing costs.

According to the third aspect of the present invention, by disposing the rolling cylinder and the horizontal sensor at positions facing each other with the rolling axis interposed therebetween, the balance is improved around the rolling axis and stable operation is achieved. Can be contributed to.

According to the management work vehicle described in claim 4, 3
Since at least one of the horizontal holding mechanism and the horizontal control mechanism is disposed substantially inward of the three wheels, the balance of the entire management work vehicle is good, and the aircraft body is effectively supported by the three wheels. Can be.

According to the fifth aspect of the present invention, at least one of the horizontal holding mechanism and the horizontal control mechanism is located substantially at the center of the body of the maintenance work vehicle, so that the balance is improved and the stable body is provided. Can be supported.

[Brief description of the drawings]

FIG. 1 is a side view of a management work vehicle according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a drive explanatory diagram of the same.

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

FIG. 5 is a front view of the vicinity of a link mechanism according to the present invention.

FIG. 6 is a side view of the same.

FIG. 7 is a plan view of the same.

FIG. 8 is an exploded explanatory view of the horizontal holding mechanism.

FIG. 9 is a side view of a grooving machine.

FIG. 10 is a plan view of the same.

[Explanation of symbols]

 26 Parallel Link 30 Hydraulic Lifting Cylinder 60 Front Hitch 60a Substrate 60b Left End 60c Right End 61 Rear Hitch 61a Flat 61b Left End 61c Right End 62 Upper Link 62a Bearing 63 Lower Link 63a Bearing 64, 65 Shaft 66 Part 67 Bearing part 68 Rotating shaft 69 Rolling cylinder 70 Horizontal sensor 71 Rolling cylinder fixing member 72 Potentiometer 73 Potentiometer fixing member 74 Rolling shaft 75 Rolling shaft support

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mitsuhiko Tanji 1-32 Chaya-cho, Kita-ku, Osaka-shi, Osaka F-term in Yanmar Agricultural Machinery Co., Ltd. 2B041 AA02 AA11 AB05 AC03 AC07 BB02 CA07 CA17 CC07 DC13 EA03 HA05 HA06 HA13 HA15 HA17 HA26 2B304 KA02 KA11 LA02 LA06 LA10 LB04 LB16 LC02 LC05 MA08 PC02 PD34 QA07 QA26 QB02 QB03 QB04 QC03 QC07 QC12 QC16 RA14

Claims (5)

[Claims] 1. A management work vehicle having a work machine for performing management work in a field or the like, wherein the management work vehicle has a parallel link mechanism that supports the work machine, and a front hitch disposed on the link mechanism. In addition, a rear hitch is provided at a position facing the front hitch via a rolling shaft provided in the front-rear direction of the management work vehicle, and in a configuration in which a working machine is connected to the rear hitch, the rear hitch is connected to the front hitch. Relative to the hitch and in a substantially vertical plane,
A maintenance work vehicle having a horizontal holding mechanism for keeping the work machine level. 2. The apparatus according to claim 1, further comprising a horizontal control mechanism including a rolling cylinder for changing the rear hitch so that the working machine is at a horizontal position, and a horizontal sensor for detecting a horizontal position, together with the horizontal holding mechanism. The management work vehicle described. 3. The management work vehicle according to claim 2, wherein the rolling cylinder and the horizontal sensor are disposed at positions facing each other with a rolling shaft interposed therebetween. 4. In a configuration in which the maintenance work vehicle travels on three wheels, at least one of the horizontal holding mechanism and the horizontal control mechanism is disposed substantially inside the three wheels. The management work vehicle described in. 5. A configuration in which the management work vehicle has one wheel on a front wheel and two wheels on a rear wheel.
The management work vehicle according to claim 1, wherein at least one of the horizontal holding mechanism and the horizontal control mechanism is disposed immediately behind a front wheel.