| 摘要 |
PCT No. PCT/GB86/00256 Sec. 371 Date Feb. 27, 1987 Sec. 102(e) Date Feb. 27, 1987 PCT Filed May 9, 1986 PCT Pub. No. WO86/06788 PCT Pub. Date Nov. 20, 1986.A device for impulsively varying the timing of the rotation of a camshaft (1) relative to a driving sprocket wheel (14) mounted on a stubaxle (102) comprises followers (119,110) rotatable with respective follower shafts (103,104) mounted on the sprocket wheel (14) for rotation about axes parallel to the axis of rotation of the sprocket wheel and rotatable with the sprocket wheel; the follower shafts carrying planet gears (106,108) operative to transmit rotational movement in phase from the sprocket wheel to the camshaft via sun gear (107); and, an annular cam (117), whose angular position is adjustable by means of a worm wheel (112) and worm (111) arrangement, has an internal profile with which the followers (119,110) are held in engagement and which imparts periodic rotational movement to the follower shafts to carry the phase of the movement transmitted to the camshaft in a pulsed fashion.
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