초록 ▼

A hydraulic control system for a torque converter including a lockup clutch is disclosed in which a first or feed passageway communicates with a source of pressurized fluid and with a torque converter chamber, a second or discharge passageway communicates with the torque converter chamber and a thir

A hydraulic control system for a torque converter including a lockup clutch is disclosed in which a first or feed passageway communicates with a source of pressurized fluid and with a torque converter chamber, a second or discharge passageway communicates with the torque converter chamber and a third passageway communicates with a lock-up control or clutch chamber of the lockup clutch. A lock-up control valve communicates with the same source of pressurized fluid and with the third passageway. The first passageway is provided with a flow restrictor. With the provision of the flow restrictor, the disengagement of the lockup clutch will be assured upon pressurization of the third passageway.

대표청구항 ▼

A torque converter comprising a converter cover; a pump impeller secured to said converter cover and forming therewith a torque converter chamber; a turbine runner within said torque converter chamber; a clutch piston within said chamber cooperating with said converter cover to form a lock-up chambe

A torque converter comprising a converter cover; a pump impeller secured to said converter cover and forming therewith a torque converter chamber; a turbine runner within said torque converter chamber; a clutch piston within said chamber cooperating with said converter cover to form a lock-up chamber; a source of pressurized fluid; a first passageway communicating with said source of pressurized fluid and with said torque converter chamber for feeding the pressurized fluid to the latter; a second passageway communicating with said torque converter chamber for discharging the pressurized fluid from the latter; a third passageway communicating with said lock-up chamber; a lock-up control valve communicating with said source of pressurized fluid and with said third passageway to pressurize said third passageway with the pressure of the pressurized fluid; said clutch piston having a lock-up position and a release position, and adapted to assume said lock-up position when the pressure in said lock-up chamber is relieved and the pressure in said torque converter housing biases said clutch piston toward said lock up position; and means disposed in said first passageway for ensuring the pressure prevailing in said torque converter housing is lower than the pressure which prevails in said lock-up chamber when said lock-up chamber is pressurized to bias said clutch piston toward said release position, so that said clutch piston unfailingly separates from said converter cover and moves to said release position upon pressurization of said lock-up chamber, said lower pressure ensuring means comprising a flow restrictor.