| 摘要 |
This invention, relates to direct acting valve timing-varying gear devices, which is used to change the opening and closing times of valves of an internal combustion engine. The preferred embodiment is comprised of an outer gear means in which there is a hub means having a circular periphery in rotatable sliding contact therewith and there is a plurality of phasing weights slidably disposed therein. Each of said weights having a phasing profile thereon which slideably interacts with the trailing edge of a cavity within said gear means and against the reactive side of a corresponding cavity within said hub means. Said weights respond to centrifugal force exerted thereon and by collective cooperation with said gear and hub means, said force overcomes the natural resistive torque of the camshaft thereby causing said hub to advance relative to said outer gear means. A hydraulically actuated embodiment is comprised of an outer toothed pulley means, an inner hub means and an annular piston means being seal-ably interfaced thereinbetween. Said pulley and hub, having suitable means at the forward part thereof which convolutionally enmesh with the helicoidal splines of said piston means and cooperatively transform the rotating axial movement thereof into an angular dispalcement of said hub relative to said pulley means.
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