JP2001315544A - Agricultural work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable lever operation by small operation force in a low speed area, and surely regulate a movement of a lever in a high speed area. SOLUTION: This agricultural work machine is provided with an HST 25 capable of continuously variably shifting a machine body speed to the advance and retreat side by operation of a main shift lever 32. When operating the main shift lever 32 in the vicinity of a neutral position, the HST 25 is set to the low speed area. When operating the main shift lever to both end sides, the HST is set to an advance and retreat side high speed area. When the main shift lever 32 exists in the low speed area, a position is solely held by a friction plate 39. When existing in the high speed area, the position is regulated by a notch 41 and a pin 43. In this case, the HST 25 can adjust a speed by relatively light operation force in the low speed area since return force becomes large as an operation angle of the shift lever 32 becomes large, and can be positioned by the notch 41 and the pin 43 against the return force in the high speed area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural work machine such as a rice transplanter for riding, and more particularly, to maintaining the position of a shift lever by a brake near a neutral position in an operation direction and by notches near both end positions. Related to agricultural work machines.

[0002]

2. Description of the Related Art For example, in a rice transplanter used as an agricultural work machine, a hydraulic rice continuously variable transmission (hereinafter referred to as "HST") capable of continuously changing the power generated by an engine is used for traveling speed change. When the main transmission lever is switched to the forward / reverse position, the speed can be continuously changed from 0 starting to the highest speed.

[0003] That is, when the main shift lever is reciprocated in the longitudinal direction of the fuselage from the neutral position in the operating direction, which is the stop position of the fuselage travel, the mode is switched between forward and reverse. The reciprocating swing of the trunnion shaft changes the hydraulic oil to control the output rotation. On the other hand, the positioning of the main transmission lever
As shown in FIG. 7, a notch 41 formed on a notch plate 40 is engaged with or disengaged from a pin 43 protruding from a main speed change lever.

[0004]

However, according to the conventional lever structure, the notch 41 is provided over the entire stroke in the operation direction of the main shift lever, so that the pin 43 is changed every time the main shift lever is operated. Since it was necessary to disengage from the notch 41 and release the engagement, there was a problem that the lever operation was troublesome. For this reason, for example, when loading a riding rice transplanter on a truck, it has been difficult to perform fine speed adjustment.

On the other hand, means for positioning the main shift lever without using the notch 41 is also conceivable.
In this case, it is necessary to apply a large sliding resistance to the main shift lever in order to prevent the lever from returning when a load is applied.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to operate a lever with a small operating force in a low speed range, and to make sure that the lever moves in a high speed range. To provide agricultural work machines that can be regulated.

[0007]

In order to achieve this object, according to the first aspect of the present invention, the traveling speed of the body can be continuously changed to the forward side and the reverse side by reciprocating operation of the shift lever (32). When the shift lever (32) is operated near the neutral position in the operation direction including the stop position of the vehicle running, the hydraulic transmission (25) is set to a low speed range, and When the shift lever (32) is operated near both end positions in the operation direction, in the agricultural work machine (10) configured to be set in the forward and reverse high-speed ranges, respectively, at least the shift lever (32) Brake means (39) for holding a position near the neutral position, and positioning means (41, 43) for restricting movement of the speed change lever (32) near the both end positions. Wherein the shift lever (3
2) is regulated exclusively by the brake means (39) in the low speed range, and exclusively regulated by the positioning means (41, 43) in the high speed range. I do.

In the invention according to claim 2, the positioning means has a notch (41) and a pin (43) engaging with the notch (41), and the notch (41) is provided at the neutral position. It is characterized by the following.

[Operation] In the agricultural working machine (10) of the present invention described above, the brake means (39) capable of holding the position of the shift lever (32) at least near the neutral position (N), and both end positions Positioning means (41, 43) for restricting the movement of the vicinity, and when the shift lever (32) is in a low speed range, only the braking means (3) is provided.
9) holds the position of the shift lever (32), and when the vehicle is in the high speed range, the movement of the shift lever (32) is restricted exclusively by the positioning means (41).

A hydraulic transmission (25) capable of shifting by reciprocating the shift lever (32).
Since the return force increases as the operation angle of the shift lever (32) increases, the speed can be adjusted with a relatively light operation force in a low-speed range, and the return force cannot be controlled in a high-speed range. Thus, the positioning can be reliably performed by the positioning means (41, 43).

Note that the reference numerals in parentheses described above are shown for reference to the drawings, and do not limit the present invention in any way.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a riding rice transplanter as an agricultural working machine to which the present invention is applied.
The vehicle includes a traveling body 16 supported by front wheels 12 and rear wheels 14. The traveling body 16 has a pair of left and right main frames 18 extending in the longitudinal direction of the body.

An engine 20 covered with a bonnet 17 is provided at a front portion of the traveling body 16, and a power generated by the engine 20 is directed from the engine 20 toward the rear of the body by a variable displacement pump and a hydraulic motor. Continuously variable transmission (hereinafter referred to as “HST”) 25 as a hydraulic transmission that continuously changes the speed of the vehicle, front axle 21 supporting front wheels 12, and transmission case 2
2. Further, a rear axle 23 for supporting the rear wheel 14 and the like are arranged in order. The transmission case 22 is fixed to a central differential case (not shown) of the front axle 21, changes the power input from the HST 25, and has a front axle 21, a rear axle 23, and a planting support that is lifted and lowered behind the aircraft. The power is transmitted to a unit (not shown).

A driver's seat 30 having a steering wheel 27, a display panel 29, and a seat 28 is provided on the traveling body 16 at a substantially intermediate position between the front wheels 12 and the rear wheels 14.
A main transmission lever 32 capable of controlling the vehicle running speed is disposed in the vicinity of the steering wheel 27 in the driver's seat 30, and a planting portion is provided beside the seat 28. A hydraulic planting lever 33 for raising and lowering the plant and turning on and off the planting clutch is provided.

The power of the engine 20 is transmitted to the HST 25 through a coupling 60 and a universal joint 61.
The transmission is input to the transmission case 22 via the HST output shaft 26 after being shifted by the HST 25. The transmission is transmitted from the transmission case 22 to the front axle 21 by gear coupling, the rear axle 23 by the propeller shaft 66, and further to the planting portion via the planting PTO shaft.

On the other hand, an oil cooler 68 for preventing the oil temperature from rising abnormally is mounted above the HST 25, and a radiator 69 for cooling the engine 20 is mounted in front of the oil cooler 68. Also, front axle 2
A hydraulic pump 63 that supplies hydraulic oil to the hydraulic cylinder 51 and the like via a bracket 62 is attached to the center differential case 1.

When the main transmission lever 32 is reciprocated in the direction of the arrow, the vehicle traveling speed can be continuously changed to the forward side and the reverse side via the HST 25.
That is, when the main shift lever 32 is operated near the neutral position in the operation direction including the stop position of the vehicle running, the HST 25
Is set in the low-speed range, and when the vehicle is operated near both ends in the operation direction, the high-speed range is set on the forward side and on the reverse side, respectively.

A planting portion is supported by a lifting link 55 having an upper link 56 and a lower link 57 so as to be able to move up and down behind the traveling machine body 16. The planting portion allows seedlings to be planted on a rice field. That is, the hydraulic cylinder 5 is provided between the transmission case 22 and the lifting link 36.
When the hydraulic planting lever 33 is operated, a hydraulic control valve (not shown) disposed below the driver's seat 30 is operated, and the hydraulic cylinder 51 expands and contracts based on this operation. The planting section is controlled to move up and down.

A step cover for placing a foot is formed on the traveling body 16.
A front step cover 52 is provided on the left and right sides of the vehicle, and a rear step cover 53 is provided on the rear left and right sides of the seat 28. The operator operates these step covers 5
By using the two and 53, the seedlings loaded on the front part of the traveling machine body 16 can be smoothly supplied to the seedling rest on the rear side without getting off.

In this embodiment, the brake means for holding the shift lever 32 at least in the vicinity of the neutral position in the operation direction and the movement of the shift lever 32 near both ends in the operation direction are restricted. Positioning means is provided, and the speed change lever 32 is restricted exclusively by the brake means in the low-speed range, and exclusively restricted by the positioning means in the high-speed range.

As shown in FIGS. 2 and 3, the main shift lever 32 is moved in the longitudinal direction of
−R direction), and the main shift lever 3
An arm plate 35 is integrally fixed to the rotation base end side of the rod 2, and one end of a rod 36 is rotatably mounted on the shaft via the arm plate 35. Furthermore, this rod 36
A trunnion handle 37 is pivotally mounted on the other end of the HST 25. The trunnion handle 37 is connected to a trunnion shaft 38 of the HST 25. By the swing of the trunnion shaft 38, the swash plate of the hydraulic pump (not shown) operates to change the hydraulic oil and control the output rotation.

A friction plate 39 (brake means) is attached to the shaft 34. The friction plate 39 is urged against a friction plate 35 'integrated with the arm plate 35. By operating the main shift lever 32, the arm plate 3 is pivoted about the shaft 34.
When the rotary member 5 rotates, frictional resistance (sliding resistance) of the friction plate 39 acts on the friction plate 35 '. In the present embodiment, the frictional resistance of the friction plate 39 acts over substantially the entire operation direction of the main shift lever 32. However, for example, the frictional force is applied only near the neutral position (N) in the operation direction. The resistance may act.

As shown in FIG. 4, the main shift lever 32 is provided with a notch plate 40 from the neutral position (N) in the operating direction along the forward (F) and reverse (R) sides in the longitudinal direction of the fuselage. Are arranged close to each other. The neutral position (N) of the notch plate 40 corresponds to the stop position of the body running, and the front end side of the notch plate 40 corresponds to the high speed region in the forward direction (F) of the body running, and the rear end side. Corresponds to a high speed region in the reverse direction (R) of the vehicle traveling. In the present embodiment, the notch plate 40 has a saw-shaped notch 4 on each of a forward side (F) and a reverse side (R).
1 is formed, and this notch 41 is in the neutral position (N).
It is not formed in the vicinity.

On the other hand, as shown in FIG. 5, the main transmission lever 32 is provided with a grip portion 46 at an upper portion, and a release button 42 is attached to a tip side thereof. The main transmission lever 32 has a built-in operating rod 44 having a pin 43 protruding from the tip thereof. The pin 43 is moved laterally from an elongated hole 32a formed in the middle of the lever shaft. It is protruding. The operating rod 44 is slidable up and down in the lever shaft, and is constantly urged upward by the urging force of a spring (compression) 45.

When the release button 42 is pressed downward, the pin 43 moves downward in the elongated hole 32a, and when released, moves up in the elongated hole 32a and stops at the upper end position. Therefore, when the release button 42 is pressed, the pin 43 is moved downward to disengage from the notch 41, and then the release button 42 is released, the pin 43 is engaged with the notch 41 and is positioned at that position. You. In this manner, the main transmission lever 32 can be positioned at a desired position. When the position is to be changed, the release button 42 must be pressed to move the pin 43. The notch 41 and the pin 43 constitute a positioning means.

FIG. 6 is a diagram showing another embodiment.

That is, in this embodiment, the notch 41 is formed on the forward side (F) and the reverse side (R) of the notch plate 40, respectively, and the notch plate 40 is located at the neutral position (N). A notch 41 is also provided. Therefore, due to the notch 41 at the neutral position (N),
Even at the neutral position (N), the main shift lever 32 can be reliably positioned. Thus, even if the operator accidentally puts his hand on the main shift lever 32 when the main shift lever 32 is located at the neutral position (N), the main shift lever 32 does not move indiscriminately. Can be effectively prevented.

Next, the operation will be described.

The main transmission lever 32 is moved to the notch plate 40
Reciprocating operation in the longitudinal direction of the aircraft along
Reference numeral 5 indicates that the running speed of the vehicle body can be continuously changed from the zero start to the maximum speed to the forward side and the reverse side, respectively. And
When the main shift lever is operated near the neutral position (N), HS
T25 is stopped or set to low speed range,
HST25 is set to the high-speed range on the forward side (F) when operated to the front end side in the operation direction, and HST25 is set to the high-speed range on the rearward side (R) when operated to the rear end side in the operation direction.

At this time, assuming that the notch plate 40 is formed with notches 41 only on the forward side (F) and the reverse side (R), for example, the main shift lever 32 is moved along the operating direction to move the notch 41 forward. In order to position it at any position on the side (F) and the reverse side (R), the release button 42 arranged at the top of the main shift lever 32 is pressed, and the pin 43 built in the lever shaft is moved downward. The main shift lever 32 is tilted to a target position while being separated from the notch 41. Then, release the release button 42 at the target position,
Pin 43 engages notch 41.

When the main shift lever 32 is operated near the neutral position (N) in the operating direction, the frictional force is always applied to the main shift lever 32 by the action of the friction plate 39. The main transmission lever 32 is held at a desired position by the force. Moreover, at this time, in the HST 25, the return force increases as the angle of the trunnion handle 37 increases, so that the HST 25 is weak enough to oppose a small return force in order to operate in a low speed range near the neutral position (N). The position of the main transmission lever 32 can be held by the frictional force of the friction plate 39. In order to operate near the neutral position (N), it is not necessary to operate the above-described release button 42, so that fine adjustment is possible and the main shift lever 32 can be moved to a desired position by a simple operation. Can be held.

As described above, the main speed change lever 32 is held in position by the action of the friction plate 39 only in the low speed range and with a reduced operating force. In the high speed range, the pin 43 is exclusively used. The position can be regulated by the notch 41 and the main transmission lever 32 without returning.

[0034]

As described above, according to the first aspect of the present invention, the position of the shift lever near the neutral position in the operation direction including the stop position of the vehicle running is exclusively performed by the brake means. In addition, positioning near the both ends in the operating direction is performed exclusively by the positioning means. In a low-speed range where the return force of the shift lever is small, the lever operation can be performed with a relatively small operating force against the braking means. As well as being able to hold the speed change lever at any position near the neutral position without releasing the regulating member, fine speed adjustment can be performed. Further, in a high speed range where the return force of the shift lever is large, the movement of the shift lever can be reliably restricted by the positioning means.

According to the second aspect of the present invention, the positioning means has the notch and the pin engaged with the notch, and the notch is provided at the neutral position of the lever operation, so that the shift lever is at the stop position. At this time, even if the hand comes into contact with the lever carelessly, the speed change lever does not move indiscriminately, thereby preventing malfunction.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire riding rice transplanter to which the present invention is applied.

FIG. 2 is a perspective view showing an operation structure of a main transmission lever.

FIG. 3 is a perspective view showing a modification of the above.

FIG. 4 is a front view of a notch plate.

FIG. 5 is a cutaway front view of a main transmission lever.

FIG. 6 is a view showing another embodiment of the notch plate.

FIG. 7 is a front view of a conventional notch plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Riding rice transplanter 12 Front wheel 14 Rear wheel 16 Traveling body 25 HST (hydraulic transmission) 32 Main transmission lever 35 'Friction plate 39 Friction plate (braking means) 40 Notch plate 41 Notch (Positioning means) 43 Pin (Positioning means)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G05G 5/12 G05G 5/12 Z F term (Reference) 2B043 AA04 AB06 BA02 BB06 DA05 ED01 ED12 2B062 AA02 AB01 BA22 3D040 AA14 AB04 AC14 AC48 AC57 AC58 AC59 3J070 AA03 BA03 BA09 CD01 CD02 CD03 DA24 EA01

Claims (2)

[Claims] 1. A hydraulic transmission capable of continuously changing a traveling speed of a vehicle body to a forward side and a reverse side by a reciprocating operation of a transmission lever, and operating the transmission lever including a stop position of the vehicle traveling. When operated near the neutral position, the hydraulic transmission is set to a low speed range, and when the shift lever is operated near both end positions in the operation direction, the hydraulic transmission is set to a high speed range on a forward side and a reverse side, respectively. An agricultural work machine, comprising: a brake unit that enables a position of the shift lever to be held at least in the vicinity of the neutral position; and a positioning unit that restricts movement of the shift lever near the two end positions. In the low-speed range, it is exclusively regulated by the brake means, and in the high-speed area, it is exclusively regulated by the positioning means. Agricultural machine according to claim. 2. The agricultural work machine according to claim 1, wherein said positioning means has a notch and a pin engaged with said notch, and said notch is provided at said neutral position.