| 摘要 |
PROBLEM TO BE SOLVED: To provide a position detection device for a control shaft, capable of directly detecting the position of the control shaft even structured with its approximately entire peripheral surface covered, in a variable valve train which changes a valve characteristic of an internal combustion engine in accordance with displacement of the control shaft. SOLUTION: The variable valve train changes the valve characteristic of the internal combustion engine through axial displacement of the control shaft 54 by an actuator 60. Approximately the entire peripheral surface of the control shaft 54 is covered by an outer shaft 53 restricted in axial displacement of the control shaft 54. The position detection device for the control shaft 54 comprises an opening portion 53b formed on the outer shaft 53 and exposing a part of the peripheral surface of the control shaft 54, a portion to be detected 63 formed at that location on the peripheral surface of the control shaft 54 which corresponds to the opening portion 53b, and a position sensor 64 disposed in accordance with the opening portion 53b of the outer shaft 53 to detect displacement of the portion 63 to be detected. COPYRIGHT: (C)2009,JPO&INPIT
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