| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the wear of a lost motion lifter from being concentrated in a narrow range. <P>SOLUTION: A variable valve mechanism 9 comprises an input portion 21 and an output portion 26 which are swingingly arranged on the same axis line so as to be able to adjust a relative rotational phase difference G with each other, and a lost motion mechanism 41 to energize the input portion 21 to a rotation cam 10. As the rotation cam 10 rotates, the input portion 21 and the output potion 26 integrally swing so as to open and close a valve 8 in the output portion 26. The lost motion mechanism 41 is configured to include the lost motion lifter 42 brought in contact with the input portion 21, a coil spring 43 to press the lost motion lifter 42 against the input portion 21, and a ratchet mechanism 46 to rotate the lost motion lifter 42 in a one-way direction by taking a rotating force out of rotation forces into both circumferential directions P, Q generated by circumferential torsion caused in the dynamic compression of the coil spring 43 and a return of the circumferential torsion caused in dynamic expansion. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
