Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Fluid pressure actuator for adjustment of member
Reexamination Certificate
2011-04-26
2011-04-26
Siconolfi, Robert A (Department: 3657)
Endless belt power transmission systems or components
Pulley with belt-receiving groove formed by drive faces on...
Fluid pressure actuator for adjustment of member
C474S018000
Reexamination Certificate
active
07931551
ABSTRACT:
A hydraulic control apparatus includes a continuously-variable transmission; a line-pressure control section configured to produce a line pressure by adjusting a discharge pressure of an oil pump; a first hydraulic-pressure control section configured to adjust a first hydraulic pressure based on the line pressure, the first hydraulic pressure being supplied to the drive pulleys; and a second hydraulic-pressure control section configured to adjust a second hydraulic pressure based on the line pressure, the second hydraulic pressure being supplied to the driven pulleys. The continuously-variable transmission includes a pair of drive pulleys including a first movable pulley and a first fixed pulley; a pair of driven pulleys including a second movable pulley and a second fixed pulley; and a belt wound between the pair of drive pulleys and the pair of driven pulleys. The line-pressure control section is configured to adjust the line pressure to a value set by adding a margin pressure to higher one of the first hydraulic pressure and the second hydraulic-pressure, and configured to reduce the margin pressure when the first hydraulic pressure is higher than the second hydraulic pressure.
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Atsushi Fujikawa et al.(Honda R&D Co. Ltd.), “Hydraulic and Electronic Control System of CVT for Hybrid Vehicle”, Spring Congress of Automotive Engineering Exposition, May 2000, No. 67-00, pp. 1-5.
Kazuhiko Sugano et al., “Development of New-Generation Belt CVT's with High Torque Capacity for Front-Drive Cars”, Jun. 2003, No. 4, JATCO Technical Review, Japan, pp. 17-31.
Katou Yoshiaki
Yamazaki Masanori
Foley & Lardner LLP
Jatco Ltd
Momper Anna
Siconolfi Robert A
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