JPH09301005A - Farm working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely perform changeover by only a hand feeling, by operating a speed change lever switching a forward/reverse speed to a lateral direction, and respectively providing an operating position of the forward/reverse speed in right/left both end parts in this speed change lever operating range. SOLUTION: A speed change lever 36 speed change operating a main/sub speed change is provided in a left side of a managing handle 32, by operating in a right/left direction, the main speed change is switched, by operating in a front/rear direction, the sub speed change is switched to a high/low speed. A shift position of the main speed change, successively from the right, is a reverse speed, neutral and a work speed, and in a left side of the work speed, a moving speed guided by a crank-shaped guide groove is arranged. Thus by arranging a forward/reverse shift position in right/left both sides in an operating range, by only a hand feeling, forward/reverse switching can be surely performed. In order to operate from the work speed to the moving speed, the speed change lever 36 is once moved rearward, thereafter it must be moved to the left, so as to prevent the moving speed wrongly at planting work time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a speed change operation unit in an agricultural work machine such as a rice transplanter.

[0002]

2. Description of the Related Art A conventional rice transplanter having a main shift for switching a working speed, a moving speed, and a reverse speed and an auxiliary shift for changing a speed has a main shift lever for switching a main shift and a shift operation for a sub shift. The auxiliary shift lever is provided separately, and both shift levers are operated in the front-rear direction.

[0003]

Therefore, when the main shift and the sub shift are simultaneously switched, both the main shift lever and the sub shift lever have to be operated, which is troublesome and both shift levers are operated. There was a risk of confusing the operation of and erroneous operation.

[0004]

In order to solve the above problems, the present invention has the following arrangement. That is, the rice transplanter according to the present invention is configured to operate the shift lever that switches the forward speed and the reverse speed in the left-right direction, and the forward speed operation position and the reverse speed operation position are provided at the left and right ends of the operation range. The feature is that each is provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a rice transplanter shown in the drawings will be described as an embodiment of the present invention. In this rice transplanter 1, a planting part 4 is mounted at the rear of a traveling vehicle body 2 via an ascending / descending link device 3 so as to be able to ascend and descend.

The traveling vehicle body 2 includes a pair of left and right front wheels 10, 1
It is a four-wheel drive vehicle equipped with 0 and rear wheels 11, 11. Front wheel final cases 13 and 13 are provided on the left and right sides of a mission case 12 arranged in the front part of the machine body, and the front wheels 10 and 10 are attached to front wheel axles protruding outward from the front wheel final cases 13 and 13. . Further, the front end of the main frame 15 is fixed to the rear surface of the mission case 12, and the rear wheel frame 1 is attached to the center of the rear end of the main frame 15 in a freely rolling manner.
Rear wheel gear cases 17, 1 provided at the left and right ends of 6
Rear wheels 11, 11 are attached to a rear wheel axle projecting outward from 7.

The engine 20 is mounted on the main frame 15, and the rotational power of the engine taken out to the engine output shaft 20a is transmitted to the drive shaft 22a of the hydraulic pump 22 via the first belt transmission device 21. Power is transmitted from the pump drive shaft 22a to the transmission case input shaft 12a via the second belt transmission device 23. The second belt transmission device 23 includes pulleys 25A and 25B having the same diameter attached to the hydraulic pump drive shaft 22a and pulleys 26A and 26 having different diameters attached to the transmission case input shaft 12a.
Transmission belts 27A and 27B are respectively hung between B and B, and they are configured as auxiliary transmissions that apply tension to one of the belts with tension pulleys 28A and 28B to switch between low speed transmission and high speed transmission. In addition,
The clutch can be disengaged without applying tension to any belt.

The power transmitted to the mission case 12 is selectively switched by the main transmission in the case to a forward moving speed, a forward working speed, a reverse speed, and neutral. Then, the power after the shift is transmitted to the front wheels 10, 10 and the rear wheels 11, 11 to drive the traveling vehicle body 2, and is also transmitted to the planting unit 4 via the planting clutch 29 so that the planting unit 4 Drives each part.

A cockpit 31 is installed on an engine cover 30 that covers the engine 20. And the cockpit 31
A steering handlebar 32 for turning the left and right front wheels 10, 10 is provided in front of. The steering handle 32 is attached to an upper end portion of a steering shaft 34 that projects upward from the front upper surface of the mission case 12.
The lower portion of the steering handle 32 is covered with a front cover 35, a shift lever 36 for shifting the main shift and the sub shift projects from the left side surface of the front cover, and the planting clutch 29 from the operation panel portion on the upper surface of the front cover. Planting / elevating lever 37 for turning on / off the plant and raising / lowering the planting unit 4
Is protruding. The levers 36 and 37 are provided so that the grips are located slightly below the steering handle 32 and on the left and right sides, respectively. A clutch pedal 38 and left and right rear wheel brake pedals 39, 39 are provided at the foot of the cockpit 31.

The elevating and lowering link device 3 has a parallel link structure and includes one upper link 40 and a pair of left and right lower links 41, 4.
1 is provided. These links 40, 41, 41 are rotatably attached to a link base frame 42 erected on the rear end of the main frame 15 at the base side, and a vertical link 43 is connected to the tip end side. The vertical link 43 is connected to the front end of a rolling shaft 44 that projects forward from the planting part 4, and the planting part 4 is mounted so as to be rollable in the traveling direction. A hydraulic cylinder 47 is interposed between a support member fixed to the main frame 15 and a tip portion of a swing arm 46 integrally formed with the upper link 40, and the upper link 40 is expanded and contracted by hydraulic pressure. It rotates up and down, and the planting part 4 moves up and down with a substantially constant posture. The hydraulic cylinder 47 is controlled to expand and contract by a hydraulic valve 48 provided in the planting section 4.

The planting section 4 includes a transmission case 50 also serving as a frame, a planting device 51 for planting seedlings in the field soil.
The planting device 41 includes a seedling mount 52 for supplying seedlings to the planting devices 41, and floats 53, 54, 54, etc. that slide on the surface soil surface of the field to level the field before seedling planting as the machine progresses.

The float has a center float 53 in the center and side floats 54, 54 located on the left and right sides of the center float 53. The hydraulic valve 48 is switched based on the height of the surface soil surface sensed by the center float 53, and the planting part is attached. 4 up / down control is performed. For example, if the topsoil is high,
The hydraulic valve 48 is switched to the side where the hydraulic cylinder 47 is extended, and the planting part 4 is raised. On the contrary, when the surface soil surface is low, the hydraulic valve 48 is switched to the side that contracts the hydraulic cylinder 47, and the planting part 4 is lowered. In this way, the planting depth of the seedlings is always kept constant by controlling the planting part 4 to move up and down according to the height change of the topsoil surface.

Next, the operation mechanism for the main shift and the sub shift will be described. A first bracket 61 fixed to a steering post 60 supporting the steering shaft 34 rotatably supports a rotary shaft 62 in the front-rear longitudinal direction,
A U-shaped member 63 fixed to the front end of the rotation shaft 62 is provided with a cylinder 64 whose axis is orthogonal to the rotation shaft 62, and the base of the shift lever 36 is rotatably fitted to the cylinder 64. are doing. Therefore, the shift lever 36 is rotatable in the left-right direction about the rotation shaft 62 and is also rotatable in the front-rear direction with respect to the cylindrical body 64. A sub-transmission drive arm 65 is integrally attached to the U-shaped member 63, and a lower portion of the sub-transmission drive arm 65 is loosely fitted in a guide groove of a guide plate 67 attached to the second bracket 66, and the shift lever 36 is attached.
Regulates the operating range of. That is, as shown in FIG. 7, the guide groove 68 includes a main shift guide groove 68a and an auxiliary shift guide groove 68b, and the shift lever 36 moves from the "reverse speed" shift position to the "moving speed" shown in FIG. It is rotatable left and right within the range of the shift position, and within the range of the "low speed" shift position and the "high speed" shift position shown in FIGS. 5 and 6 only when operated at the "working speed". It can be rotated back and forth. The main shift guide groove 68a has a crank shape, and when operating from "work speed" to "moving speed",
It is necessary to move the shift lever 36 once in the front-back direction and then in the left-right direction. vice versa,
When returning from the "moving speed" to the "working speed", the shift lever 3
When 6 is moved left and right to the left and right positions of the "working speed", it returns to the "working speed" by the action of the tension springs 88A and 88B described later.

An auxiliary shift driven arm 70 is integrally provided on a left and right cam shaft 69 rotatably supported by the second bracket 66, and an intermediate portion of the auxiliary shift drive arm 65 and an upper end portion of the auxiliary shift driven arm 70. And are connected by a connecting rod 71. It should be noted that in actuality, the auxiliary transmission drive arm 65
Although the auxiliary shift driven arm 70 is located at the same position on the left and right sides, both of them are shown by being shifted left and right in FIG. A pair of auxiliary shift cams 73A and 73B are attached to the cam shaft 69. Operation arms 75A and 75B that pivotally support rollers 74A and 74B that come into contact with the auxiliary transmission cams 73A and 73B are rotatably provided on an operation arm shaft 76.

The tension pulleys 28A and 28B are attached to tension arms 80A and 80B fixed to cylindrical shafts 79A and 79B which are rotatably fitted to a fixed shaft 78. Further, operating arms 83A and 83B having operation pins 82A and 82B provided at their tip ends on the cylindrical shafts 79A and 79B.
Are fixed to each other, and the upper end of the operation arm 75A,
The operation pins 82A and 82B are loosely fitted in the long holes formed at the lower ends of the operation links 84A and 84B connected to the 75B, respectively. Further, spring mounting members 87A and 87B are fixed to the cylinder shafts 79A and 79B,
Tension spring 8 whose one end is locked to the mounting member
Tension pulleys 28A and 28B are provided on the side that applies tension to the transmission belts 27A and 27B by 8A and 88B.
Has been energized. Spring mounting members 87A, 87B
The clutch disengagement pins 90A, 9 protruding toward the opposite side.
0B is provided, and a hook 92 fixed to the front end portion of the clutch disengaging rod 91 that is interlocked with the depression operation of the clutch pedal 38 is engaged with both clutch disengaging pins 90A and 90B.

When the speed change lever 36 is operated at "low speed", the auxiliary speed change cam 73B pushes the operation arm 75B forward, and the operation link 84B operates the operation pin 82, as shown in FIG.
By pulling up B, the tension arm 80B rotates upward, and only the transmission belt 27A is in a tensioned state, and the rotational power of the engine is transmitted to the transmission in the transmission case 12 at a low speed. When the speed change lever 36 is operated at "high speed", the auxiliary speed change cam 73A pushes the operation arm 75A to the front side, and the operation link 84A pulls up the operation pin 82A, so that the tension arm 80A moves upward, as shown in FIG. Then, only the transmission belt 27B is tensioned, and the rotational power of the engine is transmitted at high speed to the transmission in the transmission case 12.

When the clutch pedal 38 is depressed,
The clutch disengaging rod 91 is pulled rearward, and the shift lever 3
When the clutch 6 is operated to "low speed", the clutch disengagement pin 90A is pulled backward, and when the gear shift lever 36 is operated to "high speed", the clutch disengagement pin 90B is pulled backward by the hook 92. Tension arm 80
Both A and 80B rotate upward, and either transmission belt 27
A and 27B are also in a disengaged state in which no tension is applied and the rotational power of the engine is not transmitted to the transmission in the transmission case 12.

The lower end of the sub-shifting follower arm 70 is connected to the planting / elevating lever 37 by a wire 93, so that the planting / elevating lever 37 is raised when the sub-gear is "high speed". If you operate "," the auxiliary shift will switch to "low speed." As a result, when the planting unit 4 is lifted for turning during the operation at "high speed", the auxiliary shift is automatically switched from "high speed" to "low speed", and the turning can be performed safely.

A main transmission drive arm 95 is attached to the rear end of the rotary shaft 62 so as to rotate integrally therewith. The main shift drive arm 95 is connected via a rod 98 to a shifter arm 97 that is integral with the shifter 96 of the main transmission. Therefore, when the shift lever 36 is rotated in the left-right direction, the shifter 96 is rotated in the left-right direction, and the main transmission device is shifted to each shift position.

As described above, the shift and sub-shift operation mechanism is constructed, and the shift lever 36 for shifting the main shift and the sub shift is operated.
Are arranged as shown in FIG. 8 when viewed from the cockpit 31 side. That is, the shift lever 36 is provided on the left side of the steering handle 32, and the main shift is switched by operating it in the left-right direction, and the sub-shift is switched by operating it in the front-back direction. The shift position of the main shift is "reverse speed""neutral""workingspeed" in order from the right,
Further, the "moving speed" guided by the crank-shaped guide groove is arranged on the left side of the "working speed". By arranging the forward and reverse shift positions on both the left and right sides of the operation range in this way, it is possible to reliably switch between forward and backward movements only by the feel of the hand without visually confirming the position of the shift lever 36. It is possible and has good maneuverability. In order to change from "working speed" to "moving speed", it is necessary to move the shift lever 36 backward and then to the left, so it is possible to prevent accidentally changing to "moving speed" during planting work. I'm out. In addition to “neutral”, other shift positions, for example, a shift position for driving the planting unit 4 without traveling the aircraft may be provided between the “reverse speed” and the “working speed”.

The sub gear shift is set to "high speed" when the gear shift lever 36 is set to the front side, and is set to "low speed" when the gear shift lever 36 is set to the rear side. Only when the main gear shift is "working speed", It can be operated at "high speed". Since the lever operation is easier in the front-rear direction than in the left-right direction, the operability is improved by adopting a configuration in which the auxiliary shift, which has a high shift frequency, is operated by shifting in the front-rear direction. In addition,
The auxiliary transmission may be a continuously variable transmission that adjusts the speed steplessly.

Further, on the right side of the steering handle 32, there is provided a planting / elevating lever 37 which can be operated back and forth. It is provided. When the planting / elevating lever 37 is set to “planting in”, the planting unit 4 is controlled to move up and down based on the height of the topsoil surface sensed by the center float 53, and the planting clutch 29 is engaged. 4 is driven. When it is set to "lower", the planting part 4 is lowered. When set to "neutral", the planting part 4 is fixed at a fixed position. When set to "raise", the planting part 4 rises. When in the "down", "neutral" and "up" shift positions, the planting unit 4 is not driven.

[0023]

As described above, in the agricultural working machine according to the present invention, the forward speed and the reverse speed are switched by operating the speed change lever to the left and right ends of the operating range, so that the operator can feel the hand without looking at the speed change lever. It is possible to reliably switch between forward and backward movements, and if the speed is adjusted by moving the speed change lever back and forth, the main shift such as switching between forward and reverse and the auxiliary shift for speed adjustment can be performed with one shift. Now that you can do it with the lever, you can improve the operability.

[Brief description of drawings]

FIG. 1 is a side view of a rice transplanter.

FIG. 2 is a front view of a rice transplanter.

FIG. 3 is a plan view in which a part of a traveling vehicle body is omitted.

FIG. 4 is a front view of a shift operation mechanism.

FIG. 5 is a side view of the shift operation mechanism showing a state in which the auxiliary shift is at a low speed.

FIG. 6 is a side view of a shift operation mechanism showing a state in which an auxiliary shift is at a high speed.

FIG. 7 is a plan view of a guide plate.

FIG. 8 is a view on arrow A in FIG.

[Explanation of symbols]

 1 Rice transplanter (agricultural work machine) 2 Traveling vehicle 3 Elevating link device 4 Planting part 12 Mission case 20 Engine 23 Second belt transmission (sub-transmission) 31 Pilot seat 32 Steering handle 36 Gear lever 37 Planting / elevating lever

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisashi Kamiya No. 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefectural Engineering Department, Iseki Agricultural Machinery Co., Ltd. In-house (72) Inventor Mitsuru Kosano No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A gear shift lever for switching between a forward speed and a reverse speed is configured to be operated in the left-right direction, and forward and backward operation positions are provided at both left and right ends of the operation range. Characteristic farm work machine