JP2809256B2 - Operation structure of the continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation structure of a continuously variable transmission such as a belt-type continuously variable transmission or a hydraulic continuously variable transmission, and more particularly, to a structure in which a continuously variable transmission is shifted by an actuator. A shift operation lever is attached to a moving member that is operated by the actuator so as to be movable in the direction of acceleration and deceleration and returned to a neutral position to be biased, and in which direction the speed change operation lever is operated. The present invention relates to an operation structure of a continuously variable transmission, comprising: an operation direction detecting means for detecting the operation direction; and a control means for drivingly controlling the actuator in accordance with the operation direction based on the detection result.

[0002]

2. Description of the Related Art The above-described speed change operation structure is such that even if the speed change operation load of a continuously variable transmission is large, the speed change operation is performed lightly by using the driving force of an actuator.

[0003] 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 perform the gearshift operation intended by the operator, and improvement has been desired. For example, in the case of using for traveling shift, if the operation speed of the actuator is set to a low value, when traveling from the stopped state of the aircraft is started, it is necessary to quickly increase the speed and shift to the desired traveling speed. regardless of,
There is a disadvantage that it takes time to reach the desired traveling speed because the speed is increased slowly by the actuator.If the operation speed is set higher to eliminate such a disadvantage, it can be used when traveling on uneven terrain etc. If it is desired to start and stop slowly, the acceleration / deceleration operation speed becomes too fast, which is dangerous. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to perform a shift operation with a shift operation feeling according to a driver's intention by rational structure improvement.

[0005]

The features of the first invention are as follows.
In the operation structure of the continuously variable transmission described at the beginning, an operation force detection unit that detects an artificial operation force applied to the speed change operation lever toward the speed increasing side and the deceleration side is provided, and the control unit includes: The point is that the operation speed of the actuator is steplessly changed and controlled based on the detection information of the operation force detection means, so that the operation speed increases as the detected operation force increases.

A characteristic feature of the second invention resides in that an adjusting means for changing and adjusting a target operating speed of the actuator at the same value of the detected operating force is provided.

[0007]

[Action]

[A] According to the characteristic configuration of the first invention, when the speed change operation lever is operated with a strong operation force in order to quickly perform the acceleration / deceleration operation, it is determined that the manual operation force applied to the speed change operation lever is large. The actuator is detected by the detecting means, and based on the detection information, the actuator operates at a high speed in any one of the acceleration / deceleration operation directions in which the shift operation lever is operated. Further, when it is desired to perform a slow acceleration / deceleration operation, 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 aspect of the invention, in addition to the above operation [a], the target operating speed of the actuator at the same value of the detected operating force can be changed and adjusted. It is possible to selectively use the actuator in a state where the operation speed of the actuator is suppressed to a low level even when the operation is performed, or when the operation speed is increased when the operation is performed with a strong operation force.

[0008]

Therefore, according to the characteristic structure of the first invention,
Although the speed change operation of the continuously variable transmission can be performed lightly 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 driver, so that the operation feeling of the driver can be improved. A suitable operation speed was obtained, and the maneuverability was improved. Further, according to the characteristic configuration of the second invention, since the target operating speed of the actuator at the same value of the detected operating force can be changed and adjusted, an appropriate operating speed in accordance with a difference in the skill level of the pilot or the use condition can be obtained. Therefore, the steering operability is further improved.

[0009]

Embodiments will be described below with reference to the drawings. FIG.
Fig. 2 shows a shift operation system diagram of a belt-type continuously variable transmission that is equipped for traveling shift in a work vehicle such as a combine. Output shaft 1a of engine 1 and transmission 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 configured to perform a speed change operation by an electric motor M as an actuator. The continuously variable transmission 3 winds a transmission belt 6 around a driving pulley 4 and a driven pulley 5, and
The movable pulley body 4a of the drive pulley 4 which is fitted to the output shaft 1a so as to be rotatable integrally and slidably along the axial direction, and a swing member 7 [moving member] Is linked via the mechanical linking device 8 to drive the electric motor M,
The pulley distance between the movable pulley 4a and the fixed pulley 4b is changed. It should be noted that a change in the tension of the transmission belt 6 due to a change in the pulley interval of the driving pulley 4 is absorbed by elastically biasing the pulley interval of the driven pulley by a spring (not shown).

A speed change operation lever 9 which is swingable around the same axis as the pivot axis of the swing member 7 is mounted so as to be movable in the direction of acceleration and deceleration and to return to a neutral position. That is, the spring 1 that supports the speed change operation lever 9 so as to be rotatable relative to the swing member 7 and that urges the speed change operation lever 9 between the forward and reverse sides toward the neutral position therebetween.
0 is interposed. A torque sensor S for detecting an operation force artificially applied to the speed change operation lever 9 when the speed change operation lever 9 is operated in the speed increasing direction against the urging force of the spring 10; A pair of torque sensors S, S with a torque sensor S for detecting an operation force artificially applied to the speed change operation lever 10 when operated in the direction
Is interposed between the speed change operation lever 9 and the swinging member 7. The lever operation direction is determined based on which of the pair of torque sensors S detects the torque. Therefore, the operation direction detecting means A is also used by the pair of torque sensors S, S. 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 a control means). Based on the result, the electric motor M is configured to be drive-controlled in accordance with the lever operation direction, and the operating speed increases as the detected operating force detected by the torque sensors S, S increases. The operation speed of the electric motor M is continuously changed and controlled. Further, a potentiometer type adjuster 13 is provided as adjusting means 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 at the same value of the detected operating force. As shown in FIG. 3, the control device 11 stops the operation of the electric motor M if there is no change in the output of the torque sensors S, S [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, and the output of the controller 13 is read [steps 3 and 4]. An operating speed of the electric motor M corresponding to the detected torque, that is, the operating force is obtained based on the change characteristics as shown in FIG. 2 [Step 5]. Note that the slope of the change characteristic as shown in FIG. 2 can be changed in advance by setting the controller 13. Next, the duty ratio of the pulse output signal corresponding to the target operating speed is calculated, and a pulse drive signal is output with the duty ratio required to rotationally drive the electric motor M in the direction corresponding to the acceleration / deceleration direction. There are [steps 6 to 9].

[Other Embodiment] Instead of providing a pair of torque sensors for the respective directions of acceleration and deceleration as in the above-described embodiment, as shown in FIG. Providing detection switches SW1 and SW2,
The direction of rotation of the electric motor M is determined 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 on / off switching of the electric motor M is performed by switching the first relay 14 according to the output signal from the control device 11, and the detection switches SW1, SW2
The circuit configuration is such that the second and third relays 15 and 16 are selectively switched by the ON operation of to determine the rotation direction of the electric motor M. Then, the control device controls the electric motor M so that the operating speed of the electric motor M increases as the lever operating force increases, corresponding to the detection value of the torque sensor S interposed between the shift operating lever 9 and the swing member 7. Numeral 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, and may be a hydraulic transmission such as a hydrostatic continuously variable transmission. or,
It can be used for shifting of various working devices in addition to being used for traveling shift.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a 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]

 Reference Signs List 3 continuously variable transmission 7 moving member 9 speed change operation lever 11 control means 13 adjustment means A operation direction detection means M actuator S operation force detection means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-278078 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 59/00-63/48 B60K 20 / 00-20/08

Claims (2)

(57) [Claims] A continuously variable transmission (3) is configured to perform a speed change operation by an actuator (M), and a speed change operation lever (9) is increased / decreased by a moving member (7) moved by the actuator (M). An operation direction detecting means (A) for movably moving in the speed direction and returning to the neutral position for mounting, and detecting in which direction the speed change operation lever (9) is operated to increase or decrease the speed. An operation structure of a continuously variable transmission provided with control means (11) for drivingly controlling the actuator (M) in accordance with the operation direction based on the result. Operating force detecting means (S) for detecting an artificial operating force applied toward the speed increasing side and the decelerating side, and controlling the control means (11) based on detection information of the operating force detecting means (S). The detection operating force An operation structure of the continuously variable transmission, wherein the operation speed of the actuator (M) is continuously changed and controlled so that the operation speed increases as the operation speed increases. 2. The operating structure of a continuously variable transmission according to claim 1, further comprising an adjusting means (13) for changing and adjusting a target operating speed of the actuator (M) at the same detected operating force.