JPH0549320A - Linkage operation structure of rice transplanter - Google Patents

Abstract

PURPOSE:To extremely reduce the response lag of an interlocking mechanism for operating a traveling system speed-changing device on the side of lowspeeds, while interlocking with the lifting movement of a planting device. CONSTITUTION:The speed-changing lever 22 of a belt stepless speed changing mechanism 20 for traveling is disposed in the state always energized with an extension spring 23 toward the position of the low speed side. A catching mechanism B for catching and maintaining the speed-changing lever 22 at a prescribed speed changing position by an engaging action between a pin 24 disposed in the speed-changing lever 22 and the lack 26a of a member on the side for supporting the speed-changing lever, and a canceling means F capable of canceling the engagement between the pin 24 and the lack 26a are disposed, respectively. A lifting lever 28 and the pin 24 are linked with a wire 30 in the state that a canceling means F is operated with the lifting operation of the lifting lever 28 of a planting member 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linking operation structure of a rice transplanter in which a speed change lever and an elevating lever of a planting section are mechanically interlocked.

[0002]

2. Description of the Related Art In a rice transplanter, when turning in a headland during planting work of seedlings, there is a risk of causing engine stall due to an increase in running resistance. Therefore, in order to prevent this, the planting work is interrupted during turning, and the planting device is lifted to a predetermined height to avoid headland collision, etc. This has been dealt with by providing an interlocking mechanism that shifts gears to a low speed side where the torque increases in conjunction with the upward movement.

[0003]

The above-mentioned interlocking mechanism detects the movement of the link mechanism, which is connected to the machine body so that the planting portion can be moved up and down, when it actually moves up, and thereby shifts the transmission. Was taken. As the interlocking mechanism, it is desirable to decelerate immediately after turning, but with the above-mentioned means, there is a tendency for a response delay that is slowed down after a while after actually shifting to turning traveling, and traveling during the response delay. There was a risk that the engine speed would drop too much due to the increased resistance. An object of the present invention is to reduce the response delay as much as possible and to prevent a significant decrease in engine rotation so that the planting work traveling can be switched to the turning traveling as smoothly as possible.

[0004]

In order to achieve the above object, the present invention is provided with a continuously variable transmission mechanism in a traveling transmission system, and a shift operation tool for performing a speed change operation of the continuously variable transmission mechanism. Provided in a state of being biased toward, by the engagement operation of the engaging portion provided on the gear shift operation tool and the engaging portion provided on the support member supporting the gear shift operation tool,
A locking mechanism that locks and maintains the speed change operation tool at a predetermined speed change position in the speed change region against the biasing force of the elastic member, and a release that can release the engagement between both engagement parts by the operation of the lock mechanism. And the releasing means are linked to each other in a state in which the releasing means operates when the raising / lowering operation tool for raising / lowering the planting part is operated to the raised position. And

[0005]

According to the interlocking mechanism having the above-described characteristic structure, when the lifting operation tool is operated to the raised position, the locking mechanism is released, and the elastic operation member operates the shift operation tool to the low speed position. Since this means uses the movement of the raising / lowering operation tool itself to detect the rise of the planting part, as compared with the conventional method of operating the speed change operation tool after the link mechanism actually moves, the raising / lowering operation is performed. It is possible to omit the mechanical operation time required from the time when the tool is manually operated until the link mechanism actually starts moving, and the response time can be shortened accordingly.

[0006]

Therefore, by devising a means for detecting that the planting portion of the interlocking mechanism has been lifted, the lifting mechanism is provided on the arm from the link mechanism, and the amount of time required for the operation of the lifting mechanism is reduced. It was possible to provide a coordinated operation structure for rice transplanters that could improve response delay and transition from planting work traveling to turning traveling as smoothly as possible.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows a small riding type rice transplanter, E is an engine, M is a gear transmission case, A is a belt transmission connected to and integrated with the gear transmission M, and 12 is a plant that can be raised and lowered by a four-link mechanism 21. It is an attachment. FIG. 3 shows a belt transmission A in which the belt continuously variable transmission 20 is housed in the belt case 6. The belt type continuously variable transmission mechanism 20 is constructed so as to span the drive pulley shaft 1 and the driven pulley shaft 2, and 3 and 4 are drive pulleys each having a split pulley structure,
The driven pulley and 9 are belts. A cylinder shaft 5 is splined onto the drive pulley shaft 1, a fixed pulley piece 3a is fixed to the cylinder shaft 5, and a movable pulley piece 3b is slidably fitted onto the drive pulley shaft 1. Driven pulley shaft 2
Is a cylindrical shaft that fits over a transmission shaft 7 that penetrates the transmission case 6 to the left and right, and has a fixed pulley piece 4a and a movable pulley piece 4b that are opposite to the drive pulley 3.
The belt case 6 is composed of a base case portion 6a on the gear transmission case M side and a cover case portion 6b which is bolted to the base case portion 6a. The pulley shafts 1 and 2 are provided on both of the case portions 6a and 6b. It has a bearing for supporting both ends. Fixed pulley piece 4 of driven pulley 4
A main clutch C for connecting and disconnecting the power transmission between the transmission shaft 7 and the driven pulley shaft 2 is formed between a and the transmission shaft 7, and both movable pulley pieces 3b and 4b have two swing shafts. Heart X
The operation link mechanism 8 having 1 and X2 is operated to shift gears in relation to each other. Main clutch C
Is composed of a driving side clutch member 11 supported by a support member 13 fixed to the driven pulley shaft 2 and a driven side clutch member 14 fixed to the transmission shaft 7. Gear mission M
As shown in FIG. 2, the main transmission unit 15 shifts the rotation of the transmission shaft 7 between two forward and one reverse, the PTO shaft 16 beveled from the transmission shaft 7, and the transmission shaft 17 of the main transmission unit 15. The front wheel drive shaft 18, which is interlocked with the bevel, and the differential mechanism 19, are connected to the rear end of the machine body frame 10.

Next, the lifting operation of the planting portion 12 and the gear shifting operation of the belt continuously variable transmission 20 will be described. 1 and 2
As shown in FIG. 3, the gear shift lever 22 for operating the operation link mechanism 8 is constantly urged by a tension spring (corresponding to an elastic member) 23 from the high speed H side toward the low speed L side position. Of the horizontal L-shaped slide pin (corresponding to the engaging portion) 24 and the rack portion (corresponding to the engaging portion) 26a of the rack plate 26 hanging from the guide plate 25 forming the operation path of the speed change lever 22. The locking mechanism B locks and holds the shift lever 22 against a biasing force of the tension spring 23 at a predetermined shift position in the shift region by the combined operation, and the slide pin 24 and the rack portion by the operation of the lock mechanism B. 26a and a releasing means F capable of releasing the engagement between the 26a. (A member for swingably supporting the speed change lever 22 and the rack plate 26 are both members fixed to the machine body, and the rack plate 26 corresponds to the supporting member 26 for supporting the speed change lever 22.) The rack portion 26a The slide pin 24, which is engaged and disengaged, has a lower portion and a shift lever 22 at a lower end portion.
A connecting member 22a that pivotally connects the lateral end of an L link 27 that is swingably attached to is connected, and a knob 22b for manual operation is attached to the upper part. An elevating lever (corresponding to an elevating operation tool) 28 for operating an elevating cylinder (not shown) that elevates and lowers the planting part 12 has three positions: a descending position D, a neutral N, and an ascending position U.
A tongue piece 29 which is of a position switching type and which is rockably operated by an elevating lever 28 operated to a raised position U is provided, and the tongue piece 29 and the lower end portion of the L link 27 are connected by a wire 30.
The interlocking mechanism G is configured by interlocking with each other. Therefore, when the raising / lowering lever 28 is operated to be raised, the releasing means F is actuated, the engagement of the locking mechanism B is disengaged, and the transmission lever 22 is automatically operated to the lowest speed position by the tension spring 23. The belt continuously variable transmission 20 may be replaced with a friction type or a hydrostatic type, and the wire 30 may be replaced with a rod to move the lifting lever 28.
The release means F may be linked with the release means F. When the shift lever 22 is operated independently, the lock release knob 22b provided at the upper end of the lever is pushed down to move the slide pin 2
4 and the rack portion 26a are disengaged from each other to perform a swinging operation. As shown in FIGS. 2 and 4, in the Honda transplanter, the lubricating oil of the gear transmission M is also used as the hydraulic oil of the hydraulic cylinder for raising and lowering the four-link mechanism 21, and the return oil passage 31
Is connected to a sub-case 32 that projects forward from the gear transmission M in the body frame 10. P is a hydraulic pump.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing a structure of a linkage operation mechanism.

FIG. 2 is a diagram showing the structure of the mission.

FIG. 3 is a sectional view showing the structure of a belt continuously variable transmission mechanism.

[Figure 4] Plan view of rice transplanter

[Figure 5] Side view of rice transplanter

[Explanation of symbols]

 12 planting part 20 continuously variable transmission 22 speed change operation tool 23 elastic members 24, 26a engaging part 26 support member 28 lifting operation tool B locking mechanism F releasing means

Claims (1)

[Claims] 1. A speed change operation tool (22) which comprises a continuously variable speed change mechanism (20) in a traveling power transmission system and performs a speed change operation of the continuously variable speed change mechanism (20).
Is provided with the elastic member (23) constantly urged toward the low speed side position.
The gear shift operation tool (22) is operated by the engagement operation of the engagement portion (24) provided on the above and the engagement portion (26a) provided on the support member (26) supporting the gear change operation tool (22). A locking mechanism (B) that locks and maintains a predetermined shift position in the shift region against the biasing force of the elastic member (23), and both the engaging portions (24) by the operation of the locking mechanism (B). ), (26
a) A lifting operation tool (2) for lifting and lowering the planting part (12), each provided with a releasing means (F) capable of releasing the engagement between them.
8) When the lifting means is operated to the elevated position, the lifting operation tool (28) and the releasing means (F) are linked to each other so that the releasing means (F) operates. Construction.