Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Fluid pressure actuator for adjustment of member
Patent
1992-05-14
1993-05-04
Bui, Thuy M.
Endless belt power transmission systems or components
Pulley with belt-receiving groove formed by drive faces on...
Fluid pressure actuator for adjustment of member
74867, F16H 6100
Patent
active
052076172
ABSTRACT:
A hydraulic control apparatus for a power transmitting system including a continuously variable transmission, a reversing device, and an auxiliary transmission, which apparatus includes: a solenoid valve for generating a pilot pressure for selectively placing the auxiliary transmission in high- and low-gear positions; high-gear and low-gear control valves normally operable based on the pilot pressure, to control high- and low-gear coupling devices of the auxiliary transmission to establish the high- and low-gear positions. The low-gear control valve is operated to engage the low-gear coupling device, when the low-gear control valve receives a pressure to be applied to the reversing device for forward run of the vehicle. The high-gear control valve may be operated to release the high-gear coupling device, when a thrust based on a pressure applied to the low-gear coupling device exceeds a predetermined value. The hydraulic control apparatus may further include a device for increasing a torque capacity of the high-gear coupling device during an engaging action thereof when a shift lever is operated to a reverse-drive position for reverse run of the vehicle.
REFERENCES:
patent: 4784018 (1988-11-01), Okada et al.
patent: 4867732 (1989-09-01), Soga et al.
patent: 4923433 (1990-05-01), Tanaka et al.
patent: 5006093 (1991-04-01), Itol et al.
patent: 5094129 (1992-03-01), Sugaya et al.
Hattori Yuji
Kato Nobuyuki
Sugaya Masami
Bui Thuy M.
Toyota Jidosha & Kabushiki Kaisha
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