| 摘要 |
PROBLEM TO BE SOLVED: To shorten the whole length of a variable camshaft timing system to prevent a fluid leakage. SOLUTION: This variable camshaft timing system comprises a variable camshaft timing phaser having advance chambers 102 and retard chambers 107 and mounted to a camshaft 126, an advance line 108 in fluid communication with the advance chambers 102 and leading to the camshaft 126, and a retard line 110 in fluid communication with the retard chambers 107 and leading to the camshaft 126. A cam bearing having ports aligned with the advance line 108 and the retard line 110 is surrounded by a sleeve 236 having the same thermal expansion coefficient, and a control system 130 arranged separately from the phaser has a valve for selectively impeding and unidirectionally allowing the flow of the fluid from the port of the advance line 108 or retard line 110. COPYRIGHT: (C)2006,JPO&NCIPI
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