| 摘要 |
PURPOSE:To prevent lack of oil on friction faces of bearings which are engaged in cam shaft side and crankshaft side sleeves by applying new control method of a slider in changing-over of a valve timing by relatively turning those sleeves by means of the slider. CONSTITUTION:When revolution of an output shaft 22 driven by a motor 21 is converted into linear motion of a driving sleeve 23 through means of a screwed part 22A, a slider 17 is reciprocated laterally and the motion is transmitted via a shaft 15 to bearings 15 and 16 which are engaged in slits 13 and 14 on sleeves 6 and 10 intermateably formed. Phases of a cam shaft B and a crankshaft which are connected for interlocking with a timing gear C are thereby varied to change a valve timing in two ranges A and B. With the valve timing standing in either range of A or B, a motor 21 is controlled so as to shift the 17 in the direction of taking an opposite valve timing for a short duration, thus accomplishing a demanded purpose. |
