Engine knock sensor and structure for mounting the same

摘要

Structure for mounting a knock sensor ( 41 ) on an engine includes the sensor ( 41 ) comprised of an annular main body ( 1 ) and an external connecting portion ( 2 ). The knock sensor ( 41 ) is secured onto a mounting seat ( 52 ) formed on the engine for detecting vibration thereof transmitted to a piezoelectric element ( 10 ) from the mounting seat ( 52 ) through the main cylindrical metal member ( 3 ). The mounting structure includes a clamping member ( 91 ) extending through a through-hole ( 5 ) for fixing the main body ( 1 ) on the seat ( 52 ), an engine-side engaging portion ( 53 ) radially distanced from the axis of the clamping member ( 91 ) and a bearing portion ( 2 ) provided on the sensor ( 41 ) and adapted to engage with the engine-side engaging portion ( 53 ). The knock sensor can be mounted easily with harness layout design being facilitated because the knock sensor is prevented from rotation upon mounting thereof.