| 摘要 |
<p>A cooler bypass valve (264), located in a hydraulic circuit between the discharge side of a torque converter ```and lubrication circuit (147-150), includes a valve spool (268) urged by feedback pressure acting in opposition to the force of a compression spring (284) to a bypass cooling mode position where the converter discharge fluid flow is connected to the lubrication circuit bypassing the oil cooler (126). The bypass valve (264) includes a viscosity-sensitive pressure divider, which includes a series arrangement of a laminar orifice (286) and a sharp-edged orifice (270) located between the converter discharge and an oil sump. As oil temperature increases, flow through the laminar orifice (286) produces a control pressure in opposition to the feedback pressure and additive to a spring force, which combine to move the valve spool (268) to a cooling mode position where substantially all of the converter discharge is directed through the oil cooler (126). In a predetermined temperature range, the valve maintains a position where a portion of the converter discharge is directed to the oil cooler (126), and the residual to the lubrication circuit (147-150).</p> |
