US 8,627,739 B2 · Dual fork single shift rail assembly

Abstract

A multiple shift fork, single shift rail assembly reduces weight and complexity in manual and dual clutch transmissions. In a first embodiment, a stationary shift rail includes pluralities of detenting recesses and cooperating detent assemblies are mounted on the shift forks. Associated actuators translate the shift forks and synchronizer clutches. In a second embodiment, the detenting recesses reside on the outside surface of the shift forks and the detent assemblies are mounted in the transmission housing. In a third embodiment, one shift fork is slidably mounted on the shift rail and includes an external detent assembly. The shift rail itself translates and includes detenting recesses and a second shift fork connected thereto.

Claims16

Dependent claims

A single rail shift assembly for a transmission comprising, in combination,

a pair of synchronizer clutches,
a single, stationary shift rail,
a pair of shift fork assemblies disposed for independent translation on said single, stationary shift rail, each of said shift fork assemblies including a yoke for engaging a respective one of said synchronizer clutches and ball bearing assemblies disposed between said shift fork assemblies and said single, stationary shift rail,
a pair of detenting assemblies associated with a respective one of said shift fork assemblies for resisting motion of said shift fork assemblies, each of said pair of detenting assemblies including a plurality of detenting recesses, a detent ball and means for biasing said detent ball toward said recesses, and
a pair of multiple position actuators for translating a respective one of said pair of shift fork assemblies on said single, stationary shift rail.

2 more elements

Dependencies are inferred from the claim text.

Dual fork single shift rail assembly

Life of this patent

Dual fork single shift rail assembly

Life of this patent

Abstract

Claims16