| 摘要 |
<p>A hydraulic coupling or torque converter (10) includes a double- acting clutch piston (3c) selectively engageable with a loose turbine (25), for transmitting drive from the turbine via damper (46) to output shaft (33), or with casing (31) for providing direct drive. With manual selector valve (75) in the neutral position shown, working fluid is directed to both sides of the piston to centralise it, and with valve (75) in its alternative setting fluid is directed to chamber (61) to engage the piston with the turbine. Direct drive is obtained under the control of a second valve (89). This arrangement facilitates gear changes in a semi-automatic transmission driven by the output shaft. <IMAGE></p> |
