| 摘要 |
<p>1476357 Valve gears for IC engine EATON CORP 11 June 1974 [18 June 1973] 25784/74 Heading F1B [Also in Division F2] In an hydraulic automatic back-lash adjuster pillar 40, the usual engine oil pressure feed thereto is replaced by a simple gravity feed. The back-lash adjuster pillar 40 provides zero-lash for an overhead cam-shaft I.C. engine valve operating mechanism of the type in which a rocker arm 20 has one end 23 pivotally mounted on a plunger 42 extending from the adjuster pillar 40, the other end 25 engaging a valve stem 10, and a portion 21 of its upper surface between its ends engaging a cam 31. Engine oil is pressure-fed from a central cam-shaft duct 33 and radial port 34 to outwardly spray onto a collecting shield 3 from the end of which it gravity drips via a rocker arm aperture 24 into a central reservoir 44, 45a, 46 of the adjuster pillar 40, the usual one-way spring-loaded ball-valve 48 separating the reservoir from the usual oil-filled plunger support cavity 41c which maintains the position of the plunger 42 for correct lash adjustment. Additionally, the end of the rocker arm 20 may be formed with a deflecting shield 26 to also collect oil spray from the cam-shaft and direct it via the aperture 24 to the central reservoir in the pillar 40. The arrangement is said to reduce the load applied to the cam-shaft via the gravity-fed pillar 40, as compared with the usual pressure-fed pillar, whereby lighter engine valve springs may be used to lower the valve gear dynamic forces at high engine speeds.</p> |
