Fast indexing mechanisms for CVT's
View Patent ↗A fast indexing mechanism that can be used to quickly and accurately change the axial position of a cone of a CVT. Said indexing mechanism comprises of a Rotation Providing Mechanism that is powered by springs that are tensioned by a pneumatic/hydraulic actuator (see FIGS. 41 and 42 ), a Rotation to Linear Converting Mover Mechanism (see FIG. 44 ), and an Indexing and Clutching Mechanism (see FIG. 43 ).
1. An indexing mechanism that can be used to move an item of a pre-determined weight, the indexing mechanism comprising
a) an index bar that has lengthwise cavities into which a lock can be inserted; when said lock is inserted into a selected cavity of the lengthwise cavities, linear movements of said item is locked; and when said lock is not inserted into the selected cavity of the lengthwise cavities, said linear movements of said item is allowed;
b) means for controlling said lock;
c) an output shaft;
d) a rotation to linear converting mover mechanism, which converts a rotational input provided by the output shaft to the linear movements of said item and said index bar;
e) an actuator lever that can rotate about a pivot point that is co-centric with a center of said output shaft;
f) a clutch that can controllably engage and disengage said actuator lever with said output shaft; when said actuator lever is engaged with said output shaft, a rotation from said actuator lever is transferred to said output shaft; and when said actuator lever is disengaged with said output shaft, said actuator lever is allowed to rotate relative said output shaft;
g) means for rotating said actuator lever that can be used to rotate said actuator lever clockwise and counter-clockwise;
h) a first stop and a second stop, said first stop is used to limit the clockwise rotations of said actuator lever, and said second stop is used to limit the counter-clockwise rotations of said actuator lever; rotating said actuator lever from a position where said actuator lever is in contact with said first stop to a neutral position, which is a mid-point position between said first stop and said second stop, causes said index bar to move from the selected cavity of the lengthwise cavities to a next cavity of the lengthwise cavities, and rotating said actuator lever from a position where said actuator lever is in contact with said second stop to said neutral position also causes said index bar to move from the selected cavity of the lengthwise cavities to another next cavity of the lengthwise cavities,
i) a first tension spring and a second tension spring; said first tension spring is attached to said actuator lever in a manner so that the first tension spring can be tensioned by rotating said actuator lever from said neutral position towards said first stop; and in a manner so that tension of the first tension spring can be used to rotate said actuator lever from said first stop towards said neutral position; and said second tension spring is attached to said actuator lever in a manner so that the second tension spring can be tensioned by rotating said actuator lever from said neutral position towards said second stop; and in a manner so that tension of the second tension spring can be used to rotate said actuator lever from said second stop towards said neutral position.
2. The indexing mechanism of claim 1 , wherein said means for rotating said actuator lever is a pneumatic or hydraulic cylinder that is powered and controlled by a pneumatic or hydraulic system.
3. The indexing mechanism of claim 2 , wherein said pneumatic or hydraulic system includes two vent/return valves, a first vent/return valve for a pulling chamber of a linear actuator and a second vent/return valve for a pushing chamber of said linear actuator, said two vent/return valves are used for releasing pressure in a pressurized chamber of said linear actuator during the rotation of said actuator lever towards said neutral position due to the tension of said first tension spring or said second tension spring.
4. The indexing mechanism of claim 3 , wherein said indexing mechanism makes use of a damping and recovery system that can be used to dampen shock loads that occur during an operation of said indexing mechanism, and wherein said damping and recovery system comprises:
a) means for connecting said pulling chamber of said linear actuator to a recovery accumulator;
b) means for connecting said pushing chamber of said linear actuator to said recovery accumulator; and
c) two recovery valves, a first recovery valve for exposing or sealing said pulling chamber to said recovery accumulator and a second recovery valve for exposing or sealing said pushing chamber to said recovery accumulator;
d) wherein said recovery accumulator can store gas or fluid under pressure; during a braking interval, said recovery accumulator is used to brake the rotation of said actuator lever as said actuator lever is near said neutral position.
5. The indexing mechanism of claim 4 further comprising sensors, wherein said sensors are limit switches that can measure extension and retraction of said linear actuator.
6. The indexing mechanism of claim 4 further comprising sensors, wherein said sensors are differential pressure switches that trip when the pressure in the pressurized chamber of said linear actuator that is being pressured is equal or lower within a pre-set value relative to the pressure in said recovery accumulator.