BARREL CAM SHIFT MECHANISM
First Claim
1. A barrel cam shift mechanism for a transmission comprising, in combination,at least one shift fork body disposed for bi-directional translation and having a cam follower, said cam follower having a spring biased member,a barrel cam having at least one cam track for receiving said spring biased member of said cam follower, said cam track having at least one means for directing said cam follower along one portion of said cam track in response to rotation of said barrel cam in one direction and directing said cam follower along another portion of said cam track in response to rotation of said barrel cam in an opposite direction, anddrive means for bi-directionally rotating said barrel cam.
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0 Petitions
Accused Products
Abstract
A shift mechanism for a dual clutch transmission employs a rotating barrel cam having at least three tracks which are engaged by and translate at least three associated cam followers. The cam followers extend from shift fork bodies which slide on rails and include shift forks which bi-directionally translate at least three synchronizer clutches which engage at least five forward gears or speeds and reverse. A single electric motor and gear train drive the barrel cam.
51 Citations
20 Claims
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1. A barrel cam shift mechanism for a transmission comprising, in combination,
at least one shift fork body disposed for bi-directional translation and having a cam follower, said cam follower having a spring biased member, a barrel cam having at least one cam track for receiving said spring biased member of said cam follower, said cam track having at least one means for directing said cam follower along one portion of said cam track in response to rotation of said barrel cam in one direction and directing said cam follower along another portion of said cam track in response to rotation of said barrel cam in an opposite direction, and drive means for bi-directionally rotating said barrel cam.
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8. A cam track shift mechanism for a dual clutch transmission comprising, in combination,
at least one spaced apart pair of gears and a synchronizer clutch disposed between said pair of gears at least one shift fork body disposed for bi-directional translation, said shift fork body having a fork engaging said synchronizer clutch and a cam follower, a cylindrical cam body having at least one cam track for receiving said cam follower, said cam track having means for guiding said cam follower toward a first portion of said track in response to rotation of said cam body in one direction and guiding said cam follower toward a second portion of said track in response to rotation of said cam body in an opposite direction, and a bi-directional electric motor having an output driving a speed reduction assembly having an output driving said cam body.
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14. A barrel cam shift mechanism for a dual clutch transmission comprising, in combination,
at least one synchronizer clutch, at least one shift fork body disposed for axial translation on a rail, said shift fork body having a fork engaging said synchronizer clutch and a cam follower, a barrel cam having at least one cam track for receiving said cam follower, said cam track having direction sensitive means for directing said cam follower along a first portion of said track after encountering said direction sensitive means during rotation of said barrel cam in one direction and directing said cam follower along a second portion of said track after encountering said direction sensitive means during rotation of said barrel cam in an opposite direction, and a bi-directional electric motor having an output driving a speed reduction assembly having an output driving said barrel cam.
Specification