| 摘要 |
PURPOSE:To achieve a precise valve timing control without causing any backlash, by allowing a pair of sleeves respectively connected to a cam shaft and a timing gear and the like to engage a common shaft, and by displacing the common shaft transversely with respect to the axis thereof. CONSTITUTION:An inner sleeve 6 is fixed to an end of cam shaft B supported by a cylinder head A by means of a bolt 5, while a timing gear C connected to a crank-shaft for interlocking movement has an outer sleeve 10 fixed thereto by means of a bolt 9. Two sleeves 6 and 10 are engaged each other for relative movements therebetween and have slits 13 and 14 projected from position opposing the axial direction around a periphery thereof, these slits 13 and 14 being projected to incline in the reverse axial direction of cam-shaft 2 for intersecting. These slits 13 and 14 are engaged by a bearing shaft 19 via bearings 15 and 16, and a vlave timing can be changed as a rotation of motor 12 causes the shaft 19 to move transversely via a threaded shaft 22 and a driving sleeve 23. |
