192 clutches and power-stop control – Clutches – Progressive engagement
Patent
1975-08-13
1976-10-05
Scott, Samuel
192 clutches and power-stop control
Clutches
Progressive engagement
74339, F16D 1300, F16H 338
Patent
active
039839796
ABSTRACT:
Shiftable gearing including spring loaded means and blocker means for effecting engagement of clutch teeth. In a transmission having a main shaft and at least one countershaft, and including pairs of shiftable gears arranged on and cooperatively between said shafts, there are provided spring loaded clutches for effecting connection to one of said shafts of a selected one gear of a selected one of said pairs of said gears upon the achievement of substantial synchronization between such gear and such shaft. Blockers are provided for protecting the clutch teeth from excessive wear during such shifting and malfunctioning of said blockers is prevented in part by providing light frictional drag means between each of said blockers and the portion of said clutches rotatable with said shaft and in part by angling the leading surfaces of the blocker teeth an amount sufficient to effect an unblocking under one limited set of conditions but insufficient to prevent blocking under normal operating conditions. Said drag acts axially to cause said blockers to bear against the gear cone and thereby to rotate therewith promptly upon the commencement of an engaging or clutching operation. Said angling enables said blockers to effect their own unblocking under certain special conditions of operation where the blockers otherwise tended to lock into blocking position but does not prevent proper operation thereof under normal operating conditions. In the illustrated embodiment, said axial drag means is provided by a friction ring on the internal wall of said blocker ring bearing against the external teeth of said one of said clutches.
The invention further includes a blocker unit for cooperation with one of a pair of interengageable clutch members, one of the teeth on said one clutch member being axially partially removed, and a pair of teeth on said blocker member extending radially toward said clutch member, said teeth being spaced apart circumferentially a distance sufficient to enable same to straddle the unremoved portion of said blocker tooth and said teeth themselves being of less circumferential extent then the spacing between the teeth of said blocker member. Normal circumferential shifting of the blocker is thereby permitted but weakening of said clutch means by the presence of the blocker is minimized.
REFERENCES:
patent: 2380559 (1945-07-01), Tyken
patent: 3175412 (1965-03-01), Peras
Chandler Lance W.
Eaton Corporation
Scott Samuel
LandOfFree
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