| 摘要 |
<p>A power assist steering system (30) is provided for use on a vehicle (10) that has a steering implement (21) and a steering mechanism (31) operatively connected to a first wheel (15). The power assist steering system (30) includes first and second vacuum actuators (40, 41) or a double acting vacuum actuator (90), vacuum means (24) for providing a vacuum to the first and second vacuum actuators (40, 41) activating means (50) for selectively activating the first and second vacuum actuators (40, 41) and power assist means (60) for assisting the steering mechanism (31) in turning the first wheel (15) in first and second directions. In an alternate embodiment the activating means (110) includes first and second discs (112, 113) that rotate relative to each other and permit the activating means (110) to selectively variably activate the vacuum actuators (40, 41).</p> |
