JPH06265017A - Operating structure of continuously variable transmission - Google Patents

Abstract

PURPOSE:To improve a feeling of speed change operation by detecting operation force to a speed change operating lever, and controlling speed change continuously variably on operation speed of an actuator to operate a continuously variable transmission so that the operation speed is increased as the operation force becomes larger. CONSTITUTION:A speed change operating lever 9 is arranged being energized to a moving member 7 to move integrally with an electric motor M so as to move freely in the increasing and decreasing direction as well as to be restorable to a neutral position. A continuously variable transmission 3 is constituted so as to carry out speed change operation by this electric motor M. A torque sensor 5, 5 is arranged to detect the operating direction of the speed change operating lever 9 as well as to detect the operation force. A detecting torque signal outputted by the torque sensor S, S is inputted to a control device 11. The control device 11 controls the electric motor M through a driving circuit 12 so that operation speed is increased as the output of the torque sensor S, S, that is, operation force becomes larger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating structure of a continuously variable transmission such as a belt type continuously variable transmission or a hydraulic type continuously variable transmission, and more specifically, it is constructed such that the continuously variable transmission is operated by an actuator. Then, the shift operation lever is attached to the moving member that is moved by the actuator so as to be movable in the acceleration / deceleration direction and biased to return to the neutral position, and in which direction the shift operation lever is operated. The present invention relates to an operation structure of a continuously variable transmission, which is provided with an operation direction detection means for detecting the operation direction, and is provided with a control means for controlling the drive of the actuator corresponding to the operation direction based on the detection result.

[0002]

2. Description of the Related Art The above-described speed change operation structure is designed to allow a speed change operation to be performed lightly by utilizing the driving force of an actuator even when the speed change operation load of a continuously variable transmission is large.

By the way, conventionally, the control means is configured to operate the actuator at a predetermined constant speed.

[0004]

However, if the operating speed of the actuator is kept constant, it is difficult for the operator to carry out the gear shifting operation intended by the operator, and improvement has been desired. For example, when it is used for traveling gear shifting, if the operating speed of the actuator is set to a low value, when starting traveling from a state where the machine is stopped, etc., it is desirable to quickly increase the speed to shift to the desired traveling speed. regardless of,
There is a drawback that it takes time to reach the desired traveling speed because the speed is slowly increased by the actuator.If the operating speed is set to a high value in order to eliminate such a drawback, when traveling on rough terrain, etc. When it is desired to start / stop slowly, the acceleration / deceleration operation speed becomes too fast, which is dangerous. An object of the present invention is to make it possible to perform a gear shift operation by a rational structural improvement with a feeling of gear shift operation that is in line with a driver's intention.

[0005]

The features of the first invention are as follows:
In the operating structure of the continuously variable transmission described at the beginning, an operating force detecting means for detecting an artificial operating force applied toward the speed increasing side and the decelerating side with respect to the speed change operating lever is provided, and the control means is provided. On the basis of the detection information of the operating force detecting means, the operating speed of the actuator is steplessly changed and controlled so that the operating speed increases as the detected operating force increases.

A characteristic configuration of the second invention is that it is provided with an adjusting means for changing and adjusting a target operating speed of the actuator when the detected operating force is the same value.

[0007]

[Action]

[B] According to the characteristic configuration of the first invention, when the gear shift operation lever is operated with a strong operation force in order to quickly perform the acceleration / deceleration operation, the human-made operation force applied to the gear shift operation lever is large. The actuator is operated at a high speed in either direction of the acceleration / deceleration operation direction in which the shift operation lever is operated, which is detected by the detection means and based on the detection information. Further, when a slow acceleration / deceleration operation is desired, the actuator is operated at a low speed in a desired direction by operating the shift operation lever with a weak operation force. [B] According to the characteristic configuration of the second invention, in addition to the above-mentioned action [a], since the target operating speed of the actuator can be changed and adjusted when the detected operating force is the same value, the gear shift operating lever can be operated with a strong operating force. Even if the actuator is operated, the operating speed of the actuator can be controlled to be low, or the operating speed can be increased when operated with a strong operating force.

[0008]

Therefore, according to the characteristic configuration of the first invention,
Although the speed change operation of the continuously variable transmission can be performed lightly by using the driving force of the actuator, the speed change operation speed can be changed according to the difference in the operation force of the operator. A suitable operating speed can be obtained, and maneuverability is improved. Further, according to the characteristic configuration of the second invention, since the target operating speed of the actuator can be changed and adjusted with the same detected operating force, an appropriate operating speed can be obtained according to the skill level of the operator, the usage situation, and the like. As a result, the maneuverability is further improved.

[0009]

Embodiments will be described below with reference to the drawings. Figure 1
[Fig. 3] is a shift operation system diagram of a belt type continuously variable transmission that is equipped for traveling gear shifting in a working vehicle such as a combine. Output shaft 1a of engine 1 and mission case 2
A split pulley type belt-type continuously variable transmission 3 is interposed between the input shaft 2a and the input shaft 2a, and the continuously variable transmission 3 is gear-shifted by an electric motor M as an actuator. The continuously variable transmission 3 winds the transmission belt 6 around the drive pulley 4 and the driven pulley 5, and
Of the drive pulley 4 externally fitted to the output shaft 1a so as to be integrally rotatable and slidable along the axial direction, and a swinging member 7 [moving member geared to a forward / reverse electric motor M gear-interlocked]. And an interlocking linkage with the mechanical linkage 8 and driving the electric motor M,
It is configured to change the pulley distance between the movable pulley body 4a and the fixed pulley body 4b. The tension change of the transmission belt 6 due to the change of the pulley spacing of the drive pulley 4 is absorbed by elastically urging the pulley spacing of the driven pulley in the direction of narrowing it by a spring (not shown).

A gear shift operation lever 9 which is swingable about the same axis as the pivot axis of the swing member 7 is attached so as to be movable in the acceleration / deceleration direction and biased to return to a neutral position. In other words, the spring 1 that supports the gear shift operating lever 9 so as to be rotatable relative to the swing member 7 and urges the gear shift operating lever 9 toward both sides of the gear shift operating lever 9 toward the neutral position.
0 is inserted. A torque sensor S that detects an operating force artificially applied to the gear shift operating lever 9 when the gear shift operating lever 9 is operated in the speed increasing direction against the biasing force of the spring 10, and a deceleration side. Torque sensor S, S for detecting an operating force artificially applied to the gear shift operating lever 10 when operated in a direction.
Is interposed between the shift operation lever 9 and the swinging member 7. The lever operation direction is determined by which of the pair of torque sensors S, S detects the torque. Therefore, the pair of torque sensors S, S are also used as the operation direction detecting means A. The electric motor M is configured to be driven via a drive circuit 12 based on a pulse output signal supplied from a control device 11 [an example of control means]. The control device 11 detects the torque sensors S, S. Based on the result, the electric motor M is configured to be driven and controlled corresponding to the lever operating direction, and the operating speed increases as the detected operating force detected by the torque sensors S, S increases. The operating speed of the electric motor M is configured to be continuously changed and controlled. Further, a potentiometer-type controller 13 is provided as a control unit for changing and adjusting the control characteristic in the change control of the operating speed, that is, the target operating speed of the electric motor M when the detected operating force is the same value. As shown in FIG. 3, if there is no change in the output of the torque sensors S, S, the controller 11 stops and maintains the operation of the electric motor M [steps 1 and 2], and there is a change in the output of the torque sensors S, S. Then, the detected torque is read to determine in which direction the torque is applied, that is, whether the torque is applied or not, and the output of the controller 13 is read [steps 3 and 4]. Based on the change characteristics as shown in FIG. 2, the detected torque, that is, the operating speed of the electric motor M corresponding to the operating force is obtained [step 5]. The slope of the change characteristic as shown in FIG. 2 can be changed in advance by setting the adjuster 13. Next, the duty ratio of the pulse output signal corresponding to the target operating speed is calculated, and the pulse drive signal with the duty ratio required to rotationally drive the electric motor M in the corresponding acceleration / deceleration direction is output. Yes [steps 6-9].

[Other Embodiments] Instead of the configuration of providing a pair of torque sensors for the respective acceleration and deceleration directions as in the above embodiment, as shown in FIG. Provided with detection switches SW1 and SW2,
The rotation direction of the electric motor M is detected by the detection switches SW1, S
It may be determined by the selective entry operation of W2. In this case, the operation direction detecting means A is constituted by the detection switches SW1 and SW2. That is, as shown in the circuit diagram of FIG. 5, the electric motor M is switched on and off by switching the first relay 14 by the output signal from the control device 11, and the detection switches SW1 and SW2 are switched.
The circuit configuration is configured to selectively switch the second and third relays 15 and 16 by the ON operation of to determine the rotation direction of the electric motor M. Then, in accordance with the detected value of the torque sensor S interposed between the gear shift operation lever 9 and the swinging member 7, the control device is arranged so that the operating speed of the electric motor M increases as the lever operating force increases. 11 changes and controls the duty ratio of the pulse current of the motor drive circuit. Further, a rotation detection sensor 17 for detecting the rotation state of the electric motor M is provided, and the control device 11 controls the electric motor M when the electric motor M is not rotating even though the motor drive signal is output. The engine 1 is automatically stopped when it is determined that the motor M is out of order. The continuously variable transmission is not limited to the belt type continuously variable transmission, but may be a hydraulic transmission such as a hydrostatic continuously variable transmission. or,
Besides being used for traveling speed change, it can be used for speed change of various working devices.

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 configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Shift operation system diagram

FIG. 2 is a diagram showing control characteristics

FIG. 3 is a control flowchart.

FIG. 4 is a shift operation system diagram of another embodiment.

FIG. 5 is an electric circuit diagram of another embodiment.

[Explanation of symbols]

 3 Continuously Variable Transmission 7 Moving Member 9 Shift Operating Lever 11 Control Means 13 Adjusting Means A Operating Direction Detecting Means M Actuator S Operating Force Detecting Means

Claims (2)

[Claims] 1. A continuously variable transmission (3) is configured to perform a gear shift operation by an actuator (M), and a gear shift operation lever (9) is increased / decreased in a moving member (7) which is moved by the actuator (M). It is mounted so as to be movable in the speed direction and biased to return to the neutral position, and is provided with operation direction detection means (A) for detecting in which direction the speed change operation lever (9) has been operated for acceleration or deceleration. An operating structure of a continuously variable transmission, which is provided with a control means (11) for driving and controlling the actuator (M) according to the operation direction based on the result, with respect to the gear shift operating lever (9). And an operating force detecting means (S) for detecting an artificial operating force applied toward the speed increasing side and the decelerating side, and the control means (11) is based on detection information of the operating force detecting means (S). And the detection operation force An operating structure of a continuously variable transmission configured so that the operating speed of the actuator (M) is steplessly changed and controlled so that the larger the operating speed is. 2. The operating structure for a continuously variable transmission according to claim 1, further comprising adjusting means (13) for changing and adjusting a target operating speed of the actuator (M) when the detected operating force is the same value.