| 摘要 |
PCT No. PCT/GB89/00459 Sec. 371 Date Oct. 22, 1990 Sec. 102(e) Date Oct. 22, 1990 PCT Filed May 2, 1989 PCT Pub. No. WO89/10469 PCT Pub. Date Nov. 2, 1989.A variable camshaft phasing mechanism is described comprising concentric drive and driven members (12, 10) rotatable respectively with a drive pulley (12) and a camshaft (14). The members (10, 12) are coupled to one another by means of an eccentric cranking element (18) on one of the members (12) engaged by two hydraulic jacks (28, 30) on the other member (10). Valves (36) are provided for controlling the flow of the hydraulic fluid from the chamber of the hydraulic jack (28, 20) to lock the members (10, 12) against rotation relative to one another in different relative angular positions of the members and to permit flow from either of the cylinders of the jacks to the other.
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