Angularly adjustable timing gear

In an internal combustion engine having an output shaft and a camshaft operable in timed relation with the output shaft of a variable camshaft timing drive comprising:

• a first rotatable drive member driven by the output shaft,
• a second rotatable drive member mounted on the camshaft and operably connected with the first drive member for rotation in timed relation therewith,
• means mounting said second drive member on said camshaft for rotation on a common axis, said second drive member and said camshaft having opposing engagable surfaces capable of being secured together to fix the angular relation of said members, said mounting means being formed to permit limited relative angular rotation of said members when said surfaces are not so secured, and
• means for adjusting the relative angular positions of said second drive member and said camshaft and means for securing said second drive member to said camshaft in selected positions, said adjusting means comprising an unthreaded cylindrical stud extending from said camshaft into a radially extending slotted opening through said second drive member, said slotted opening having angularly spaced, parallel sides, an eccentric cam freely rotatable on the cylindrical stud and closely fitting between said parallel sides, a tool receiving portion on said eccentric cam for permitting selected rotation of said eccentric cam to cause relative angular adjustment of said second drive member relative to said camshaft, said slotted opening and said eccentric cam having cooperating interengaging portions lying in a plane perpendicular to an axis of rotation of the camshaft for retaining the eccentric cam in the slotted opening while permitting free rotation of the eccentric cam.