JPH0611037A - Shift operation construction - Google Patents

Abstract

PURPOSE:To previously prevent damage of a motor-driven cylinder for driving a belt type continuous variable transmission. CONSTITUTION:This shift operating construction is constituted so that a belt type continuous variable transmission 5 is mounted between in a machine body running drive system, a transmitting belt 11 is laid extending around a pair of pulleys 9, 10 of the belt type continuous variable transmission 5, the respective pulleys 9, 10 are constructed into split pulleys, and pulley interval of these split pulleys is changed by means of a motor-driven cylinder 14 so as to operate shifting. Only when an engine 4 is driven to rotate, the motor-driven actuator 14 is constituted so as to be allowed to operate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a belt type continuously variable transmission interposed in a vehicle body drive system, and the belt type continuously variable transmission has a transmission belt wound around a pair of pulleys. The present invention relates to a gear shift operation structure in which one pulley is a split pulley and the pulley spacing of the split pulley is changed by an electric actuator to perform a gear shift operation.

[0002]

2. Description of the Related Art In the above gear shifting operation structure,
The control device drives and controls the electric actuator so that the operation amount of the speed change operation tool due to manual operation is detected by the potentiometer and the output of the potentiometer and the detection result of the detection sensor for detecting the actual operation amount by the electric actuator match. Those configured as described above have been put into practical use, and such control operation was configured to function when the main switch was turned on and operated.

[0003]

However, in the above-mentioned conventional structure, when the main switch is turned on and operated, the drive current can be supplied to the electric actuator even when the engine is stopped. , If the gear shift operation tool is operated by mistake while the engine is stopped, the electric actuator will try to operate. However, it takes a large driving force to change the pulley interval of the split pulley in the transmission of this type interposed in the airframe traveling system while the transmission belt is stopped, and the power of the electric actuator cannot cope with it. In such a case, the electric actuator may be burnt, and there is room for improvement. The present invention aims to eliminate the above-mentioned problems.

[0004]

According to a characteristic structure of the present invention, in the gear shift operation structure described at the beginning, there is provided actuator operation restraining means for permitting the operation of the electric actuator only when the engine is driven and rotated. There is a point.

[0005]

The operation of the electric actuator is allowed only when the engine is rotating, that is, when the winding transmission belt is rotating. Therefore, when the electric actuator is driven, the preset value is always set. The load for gear shifting is only applied, and there is no possibility that the electric actuator unexpectedly reaches the driving state and burns when the engine is stopped due to an erroneous operation or the like.

[0006]

Therefore, the rational improvement makes it possible to prevent damage to the electric actuator due to erroneous operation or the like, and to maintain smooth gear shift operation for a long period of time.

[0007]

Embodiments will be described below with reference to the drawings. Figure 2
Shows a riding type rice transplanter. This rice transplanter is equipped with a seedling planting device 2 through a link mechanism 1 at the rear of the riding type traveling body.
A hydraulic cylinder 3 is connected so that it can be driven up and down. An engine 4 is mounted in the front hood of the traveling machine body, and the power of the engine 4 is transmitted to a transmission case 6 via a belt type continuously variable transmission 5, and the front and rear wheels 7, 8 are transmitted from the transmission case 6. In addition, a transmission system is configured to branch and transmit to the seedling planting device 2. As shown in FIG. 1, the belt type continuously variable transmission 5 includes a transmission belt 11 extending over a pulley 9 attached to an output shaft 4a of an engine 4 and a pulley 10 attached to an input shaft 6a of a transmission case 6. Is configured to apply a tension force to the transmission belt 11, and each of the pulleys 9 and 10 is configured as a split pulley.
It is configured such that the pulley spacing can be changed and the belt winding diameter can be changed by operating the electric cylinder [an example of an electric actuator] 14 via the cam mechanisms 12 and 13 in a contradictory manner. The electric cylinder 14 is configured to drive a screw feed mechanism by a built-in electric motor to expand and contract, and is controlled to be driven and controlled by a control device 15 including a microcomputer. That is, the operation amount of the gear shift operation lever 16 provided in the machine body control section is detected by the potentiometer PM, and the output of the potentiometer PM is input to the control device 15, and the actual operation amount of the electric cylinder 14 is detected by the stroke sensor 17. And a feedback to the control device 15, and a shift control means A for controlling the drive of the electric cylinder 14 so that the output of the potentiometer PM and the detection value of the stroke sensor 17 match is provided in a control program format. is there. Therefore, it is possible to set the shift state in which the proportional control in which the traveling speed changes in proportion to the operation amount of the shift operation lever 16 can be performed. Then, only when the engine 4 is driven and rotated, the electric cylinder 1
4 is provided with actuator operation restraint means B that allows the operation of No. 4 in FIG. More specifically, the hydraulic pump P for supplying pressure oil to the lifting hydraulic cylinder 3 and the like is configured to be directly rotated by the engine 4, and the hydraulic pump P discharges when the engine 4 is stopped. Focusing on the point that the amount becomes zero, a flow switch SW that automatically switches to the conductive state when the pressure oil flows is provided inside the output side pipe 18 of the hydraulic pump P, and the output of this flow switch SW is set. When the output of the flow switch SW is in the non-conducting state, the control device 15 controls the drive operation of the electric cylinder 14 regardless of the operation of the gear shift operation lever 16. When the flow switch SW is in the conductive state, the electric cylinder 14 is controlled to be driven. That is, the actuator operation restraint means B is configured by the control program of the control device 15. In this way, with the transmission belt 11 not being rotationally driven, the electric cylinder 1
It is possible to prevent adverse effects such as burning the coil of the electric motor installed inside by forcibly driving the coil 4.

[Other Embodiment] As a configuration for judging the driving state of the engine 4, a flow switch S is provided in the hydraulic pipe.
Instead of deploying W, the rotational speed of the engine 4 may be directly detected by an electromagnetic pickup type rotational speed sensor and input to the control device 15, or the output pipe from the hydraulic pump P may be used. A pressure switch may be provided in the.

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

[Brief description of drawings]

[Fig. 1] Shift control system diagram

[Figure 2] Overall side view of rice transplanter

[Explanation of symbols]

 5 Belt type continuously variable transmission 9, 10 Pulley 11 Transmission belt 14 Electric actuator B Actuator operation restraining means

Claims (1)

[Claims] 1. A belt type continuously variable transmission (5) is provided in an airframe traveling drive system, and the belt type continuously variable transmission (5) is transmitted over a pair of pulleys (9), (10). (1
(1) is wound, at least one of the pulleys is configured as a split pulley, and the pulley spacing of the split pulley is changed by an electric actuator (14) to perform a shift operation structure. Engine (4)
A gear shift operation structure including actuator actuation restraining means (B) that permits the actuation of the electric actuator (14) only when the motor is driven and rotated.