Transmission synchronizer with shift inhibitor

192 clutches and power-stop control – Clutches – Progressive engagement

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Details

74339, 192106R, 192114R, F16D 2306

Patent

active

049018353

ABSTRACT:
A shift inhibitor for a manual transmission synchronizer clutch positioned on the main shaft and operative to prevent down-shifting to engage a selected speed gear with the output shaft being driven above a predetermined speed. The synchronizer hub has one or more pairs of diametrically opposed radially extending keyways with each keyway having a blocking key slidably disposed therein. A C-shaped wire spring partially surrounds the main shaft and has hook portions at each of its free ends retaining an associated pair of keys. The spring urges the pair of keys inwardly to a rest position wherein the synchronizer sleeve may be shifted to engage an associated speed gear of the transmission. Upon reaching a predetermined drive shaft rotational speed the pair of keys move outwardly under centrifugal force to a determined extended location whereby the extended keys contact shoulder stop faces of the sleeve internal splines preventing the sleeve from engaging the associated speed gear.

REFERENCES:
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patent: 4445602 (1984-05-01), Chana
patent: 4573371 (1986-03-01), Akutagawa
patent: 4684000 (1987-08-01), Brown

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