192 clutches and power-stop control – Clutches – Progressive engagement
Patent
1985-06-25
1987-08-18
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Progressive engagement
F16D 2306
Patent
active
046870814
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application of PCT/EP84/00314 filed Oct. 19 1984 and based upon Luxembourg application No. 83 110 691.9 filed Oct. 26 1983.
FIELD OF THE INVENTION
This invention deals with a locking synchronization for a gear shift in which a synchronizing body and a gear rotating at a different speed are connected by means of a ring-shaped axially slideable sliding sleeve are solidly connected when in synchronism, where internal coupling gearing of the sliding sleeve meshes with one each corresponding set of external gearing of the two rotating parts, with locking and/or pressure pins disposed between synchronizing body and sliding sleeve, which in the nonengaged state protrude into a cavity on the interior portion of the sliding sleeve and provide in the radially middle extent axially movable pressure surfaces, which (pressure surfaces) are in effective connection with pressure surfaces on at least one synchronizing ring disposed between synchronizing body and gear, and are in rotary connection in both senses of rotation, with circumferential play, via end stops, where elements which are coordinated with the gear, form at least one solid connection together with elements of at least one synchronizing ring, and where by lack of synchronism the axial movement of the sliding sleeve is prevented by blocking surfaces.
BACKGROUND OF THE INVENTION
Such devices are known e.g. through company memo Zahnradfabrik Friedrichshafen ZF-B- Blocking Synchronization F 42290/R2964-367, the German Patent Nos. 14 50 825 and 29 15 965, and the German Patent document No. 32 21 712.
All these devices have in common that blocking surfaces which are provided on the synchronizing ring or the sliding sleeve prevent full engagement between synchronizing body and gear via the sliding sleeve, until synchronization is attained by means of conically shaped friction surfaces. On the one hand, the friction surfaces are provided on at least one synchronizing ring which is rotatably connected to the synchronizing body with circumferential play; on the other hand they cooperate with the gear which is to be clutched in, or a coupling body on said gear. Such blocking synchronization devices which are applied to modern gear shifting drives, lead to significant simplifications in the shifting of gears, and are built as required especially for gear shifts for heavy duty vehicles, also with amplifying means, for synchronization, see German Patent document No. 32 21 712. All these lack synchronization devices have the common drawback due to the necessary actuating clearance between friction surfaces which are constructed with an angle of more than 10.degree., they have large axial dimension. If there is more than one friction array in a shift clutch, or if in a transmission several shift clutches are arranged next to one another in axial direction, then the overall length is significantly affected. In this connection, due to the friction couples, energy losses will arise. A further disadvantage of a lock synchronization containing friction cones is their high susceptibility to radial displacement within the cones.
OBJECT OF THE INVENTION
It is therefore the object of this invention to minimize or avoid, in a locking synchronization, the disadvantages due to large axial actuating clearance, the high losses of energy, and the susceptibility to radial displacement between the friction surfaces of a friction device.
SUMMARY OF THE INVENTION
This object is accomplished with a system wherein a gear, i.e. a friction surface or surfaces, are connected rotationally to the gear only when being actuated, and are freely movable when in neutral or engaged position.
While in the art the friction surfaces of a friction array are rotatably connected either to the synchronizing body or the gear, even when the shift clutch concerned is in neutral, according to this invention, the rotary connection of the friction surface which is coordinated to the gear is interrupted in the neutral and the en
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patent: 4349090 (1982-09-01), Griesser
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patent: 4425990 (1984-01-01), Griesser
patent: 4540074 (1985-09-01), Magg et al.
ZF-B-Sperrsynchronisierung--Publication by Zahnradfabrik AG, F42290/R2964-282 (no date).
ZF-B-Lock Synchronizer--Publication (English) by Zahnradfabrik AG, F42290/R2964-283e (no date).
Fuhrer Gerd
Osterloff Kurt
Bonck Rodney H.
Dubno Herbert
Lorence Richard M.
Ross Karl F.
Zahnradfabrik Friedrichshaffen AG
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