JPH0544820A - Travelling transmission for agricultural working machine - Google Patents

Abstract

PURPOSE:To operate main and auxiliary transmissions simply with a light operating force for improving operability by devising operating means for the respective main and auxiliary transmissions. CONSTITUTION:In a rice planting machine provided with a 2-stage pulley type auxiliary transmission 2 for travelling and a multiple stage gear type main transmission 3, while tension clutches 7, 9 are changed over to be turned on and off by a motor cylinder 11, the motor cylinder 11 is operated by a speed change lever 13 of the main transmission 3 so that the main and auxiliary transmissions 3, 2 are constituted to be subjected to the speed change operation by the signal speed change lever 13. In the speed change operation of the auxiliary transmission 2, the motor cylinder 11 is interlocked with the speed change lever 13 through a controller 16 such that the turning-off speed of the tension clutch 7 is faster than the turning-on speed of the tension clutch 9.

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 or a carrier equipped with a multi-stage pulley type auxiliary transmission, and more specifically, a plurality of sets of belt transmissions with tension clutches having different gear ratios. All are installed in parallel across a pair of transmission shafts, and only one tension clutch of the plurality of belt transmission mechanisms is selectively selected and operated, and all the others are operated. Relates to a traveling transmission for an agricultural work machine in which a multi-stage pulley type auxiliary transmission including a clutch operating mechanism for disengaging the tension clutch and a multi-stage gear type main transmission are provided in a traveling transmission system. ..

[0002]

2. Description of the Related Art As a shift operation structure of this type, one multi-stage pulley type sub-transmission device provided with three sets of belt transmission mechanisms is disclosed in Japanese Unexamined Patent Publication No. 64-22626. One of the belt speed change mechanisms is selectively set by swinging the auxiliary speed change lever, and a main speed change lever for changing the speed of a multi-stage gear transmission is provided, that is, for each of the main and auxiliary speed change devices. It is known that a gear shift lever is provided.

[0003]

In the rice transplanter, the planting work traveling speed can be switched between high and low depending on the condition of the paddy field and the skill level of the operator. The switching operation and the planting clutch are disengaged to activate the planting operation. The deceleration operation performed at the time of turning on the edge by suppressing the mud and suppressing the mud scratching and increasing the running resistance has conventionally operated different gear shift levers, and the operation is troublesome. Further, in the shift operation of the auxiliary transmission device, the tension arm that is biased by the spring is manually cut against the biasing force, and even if the operation is heavy and difficult to operate, there were.
The object of the present invention is mainly to provide a simple and light operating force by devising the operating means of the above-described transmissions.
The purpose of the present invention is to realize a speed change device with improved operability that allows a secondary speed change operation.

[0004]

In order to achieve the above object, the present invention provides a clutch operating mechanism in the gear shifting operation structure of a rice transplanter described at the beginning, which is provided with an actuator for actuating and disengaging a tension clutch, and those actuators are also provided. Is operated by moving the operation tool for operating the main transmission in the sub-transmission operation direction across the main transmission operation direction, and the main transmission and the sub-transmission are operated by a single operation tool. In the gear shifting operation of the auxiliary transmission device which is configured to be capable of gear shifting operation and which is operated by moving the manipulation tool in the sub-operating direction, the disengagement operation speed of the tension clutch to be disengaged is set to the engagement operation speed of the tension clutch to be engaged. The characteristic feature is that the operation mechanism and the operation tool are linked to each other in a state in which the operation speed is faster than that.

[0005]

With the above characteristic structure, it becomes possible to cover the shift operation of the main transmission device and the shift operation of the auxiliary transmission device with one operation tool, and the operation of re-holding the two operation tools as in the conventional case. Becomes unnecessary. Since the shift operation of the auxiliary transmission is performed by the driving force of the actuator, the operator only needs to start the actuator, and the force required for the shift operation can be significantly reduced. And
Since the tension clutch disengagement operation speed is configured to be faster than the engagement operation speed of the tension clutch that is engaged and disengaged, the meshing operation of the main transmission does not occur even when the main and auxiliary transmissions are operated simultaneously. Before starting, it is possible to shift to a neutral state in which all the tension clutches of the auxiliary transmission are disengaged, which makes it possible to smoothly shift the gear-type main transmission and reduce shift shock. In addition, it is convenient for avoiding the inconvenience of both transmissions overlapping with each other and being in the power transmission state.

[0006]

Accordingly, the main and auxiliary transmissions have the function of preventing redundant transmissions, and the starting and speed-up shifting can be performed smoothly, and the auxiliary transmission can be operated with a light operating force. Thus, it is possible to provide a speed change device for traveling which is simple, convenient, and has improved operability, which allows a speed change operation of both main and auxiliary speed change devices with a single operation tool.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the transmission structure in the front part of the body of the riding type rice transplanter. The power of the engine 1 is input to a mission 3 which is a main transmission composed of a multi-stage gear transmission through an auxiliary transmission 2 composed of a two-stage belt transmission, and the output of the mission 3 is transmitted using a transmission shaft 4. Is transmitted to a drive wheel (not shown). The sub transmission 2 is
Engine 1 output shaft (corresponding to transmission shaft) 5 and mission 3
The first belt transmission mechanism 8 having a high reduction ratio (low speed) and the second belt transmission mechanism 10 having a low reduction ratio (high speed) are installed side by side across the input shaft (corresponding to the transmission shaft) 6 of Composed,
The transmission mechanisms 8 and 10 are equipped with tension-type first and second clutches 7 and 9, respectively. Both clutches 7, 9
Is configured by interlocking and connecting those tension arms 7A and 9A and a cam plate 12 that is rockably operated by a single electric cylinder (corresponding to an actuator) 11 via connecting arms 19 and 20, and Tension arm 7A,
9A and the connecting arms 19 and 20 are configured as a flexible connecting structure with a long hole and a pin. As a result, a clutch operating mechanism A for operating both tension clutches 7 and 9 in a contradictory manner by the expansion and contraction operation of the electric cylinder 11 is configured. The main transmission device 3 is a gear-type transmission device having a second forward speed and a first reverse speed, and is operated by moving a manually operated speed change lever 13 in a vertical direction (main speed change direction) in the drawing. The mesh-type shift operation is configured to be switched. Then, the electric cylinder 11 is operated by swinging the speed change lever 13 in the left-right direction (sub speed change direction) in FIG. 2 to operate the first and second clutches 7,
9 is configured to be turned on and off. That is,
As shown in FIG. 1, micro switches 14 and 15 are arranged on both sides of the speed change lever 13 in the auxiliary speed change direction, and actuated by swinging movement of the speed change lever 13 in the auxiliary speed change direction at each speed change position of the main speed change device 3. It is provided in the state of
These switches 14 and 15 are connected and wired to the electric cylinder 11 via a control device 16 using a microcomputer. That is, the switching between high and low by the auxiliary transmission device 2 is performed for each position F2, F1, R of the main transmission device 3, and the operation path W of the transmission lever 13 has a "king" shape as shown in FIG. It has become.

Next, the operation of this transmission will be described. In the gear shifting operation of the auxiliary transmission 2 by the operation of moving the shift lever 13 in the front-rear direction, the control device 16 causes the disengaging speed of the tension clutch to be disengaged to be the disengaging speed of the tension clutch to be engaged. The electric cylinder 11 and the operating lever 13 are linked to each other so that the speed is faster than that. That is, when the speed change lever 13 is swung to the high speed position H of the sub transmission 2, the micro switch 15 on the high speed side is activated, and the sub transmission 2 is in the low speed state.
That is, from the state where the first belt transmission mechanism 8 is turned on and the second belt transmission mechanism 10 is turned off, to the high speed state, that is, the state where the first belt transmission mechanism 8 is turned off and the second belt transmission mechanism 10 is turned on. When migrating, it becomes as follows. That is, the driving speed of the electric cylinder 11 moves rapidly up to half the moving distance of the movable rod 11a,
The first and second tension arms 7A and 9A are rapidly rocked to half their moving distances, and the movable piston 11a is controlled so as to move slowly in the remaining half of the moving distances. Second tension arm 7A, 9
The remaining half of the moving distance of A is oscillated at a slow speed, but in the tension clutch, the transmission of the first clutch 7 due to the structure in which it shifts from the normally engaged position to the neutral position at a position slightly closer to the disengaged position. After the state is completely cut off, the operation of the second clutch 9 is started to be started.

Further, since the clutch disengagement operation of the first clutch 7 is quickly performed, the main transmission 3 is moved to the first forward speed position F1 and the auxiliary irregularity device 2 is moved to the low position L.
When the main transmission 3 is operated to a position where the main transmission 3 is in the forward second speed position F1 and the sub-regular shift device 2 is in the high position H, before the main transmission 3 starts meshing in the second forward speed, First
The clutch 7 is surely disengaged so that both the clutches 7 and 9 are disengaged so that the main gearbox 3 can be smoothly operated with a small shift shock. That is, the response delay of the electric cylinder 11 that disengages the tension clutch 7 by the manual operation of the speed change lever 13 is
Ending before the meshing operation associated with the gear shifting operation of the main transmission 3 means that in the gear shifting operation of the sub transmission by the movement operation of the operation tool in the sub operating direction, the disengagement speed of the tension clutch to be disengaged is set. , The operation mechanism and the operation tool are linked in a state in which the operation speed is higher than the operation speed of the tension clutch to be operated. In the electric cylinder 11, even if the movable rod 11a is shortened from the extended state shown in FIG. 1 by the operation of the micro switch 14 on the low speed side, the first half stroke is rapid and the second half stroke is slow. The control device 16 functions so as to move to the position.

As shown in FIG. 1, the gear shift lever 13 has a structure in which a lock device (not shown) provided at the base of the gear shift lever 13 locks the lever 13 so that the lever cannot move at a neutral position N for safety. The shift switch 13 can be operated by swinging the release switch 17 provided on the top of the grip 13a of the speed change lever 13 while pushing the switch 17 downward.

[Other Embodiments] In the above-described embodiment, the auxiliary transmission 2 has two stages of high and low, but the auxiliary transmission 2 is composed of a high speed, medium speed, and low speed three-stage belt transmission mechanism. Alternatively, a total of three hydraulic cylinders (corresponding to actuators) for each of them may be switched. Even in this case, the disengagement operation of the tension clutch 7 (9) is controlled by the control device 16 so as to be completed earlier than the switching operation of the speed change lever 13 in the main speed change direction. The switching of the moving speed of the electric cylinder 11 may be performed other than half the moving distance.
In short, it may be set so as to switch or gradually change at a position corresponding to the time from when one tension clutch is disengaged until the other tension clutch is engaged.

In order to make the comparison with the drawing convenient, reference is made to the claims of the utility model registration, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a system diagram showing an operating structure of a transmission.

FIG. 2 is a plan view showing an operation path of a shift lever.

[Explanation of symbols]

 2 Auxiliary transmission device 3 Main transmission device 5,6 Transmission shaft 7,9 Tension clutch 8,10 Belt transmission mechanism 11 Actuator 13 Operating tool A Clutch operating mechanism

Claims (1)

[Claims] 1. A belt transmission mechanism (8) with a plurality of sets of tension clutches (7), (9) having different gear ratios,
All of (10) are installed in parallel across a pair of transmission shafts (5) and (6), and one of the plurality of belt transmission mechanisms (8) and (10) has a tension clutch ( 7) A multi-stage pulley type auxiliary transmission device (2) provided with a clutch operating mechanism (A) for selectively selecting and operating only the other 7) and disengaging all other tension clutches (9). And a multi-gear type main transmission (3) are provided in a transmission system for traveling, which is a traveling transmission for an agricultural work machine, wherein the tension clutches (7), (9) are turned on and off. (11) is provided to configure the clutch operating mechanism (A), and the actuator (11) is a sub-transmission operation that crosses the main transmission operation direction of the operation tool (13) for operating the main transmission (3). Operated by moving in the direction Thus, the main transmission device (3) and the auxiliary transmission device (2) are configured to be shift-operable by a single operation of the operation tool (13), and the sub-operation of the operation tool (13) is performed. In the speed change operation of the auxiliary transmission device (2) by the moving operation in the operation direction, the disengagement operation speed of the tension clutch (7) to be disengaged is higher than the disengagement operation speed of the tension clutch (9) to be engaged and disengaged. The operating mechanism (A) and the operating tool (1
3) The gear shifting operation structure of the agricultural work machine which is linked with