192 clutches and power-stop control – Clutches – Progressive engagement
Patent
1988-08-26
1990-10-23
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Progressive engagement
192 82T, F16D 2104, F16D 2306, F16D 900
Patent
active
049645056
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase of PCT/EP87/00142 which is based upon Luxembourg PCT/EP86/00166.
FIELD OF THE INVENTION
This invention relates to a locking synchronizing means for transmission shafts.
BACKGROUND OF THE INVENTION
Synchronizing means are known from Looman-Zahnradgetriebe (Konstruktionsbucherband 26) Springer-Verlag Berling/Heidelberg/New York 1970, page 259FIG. 10.9, where the clutching tooth array of the sliding sleeve is locked onto the locking tooth array of the synchronizing ring as long as synchronism is not achieved between the synchronizing body and the gear. Such arrangements are very advantageous for the driver, because they require relatively little attention to shifting. However, they have the disadvantage that the friction means are overloaded due to the appearance of large differences in speed fo rotation and the high shifting forces frequently applied, and therefore wear out rapidly and fail prematurely. Particularly when shifting into reverse while the vehicle still moves ahead, relatively high differential speeds of rotation have to be synchronized, so that the synchronizing means are especially endangered for such a shift. However, the engine is also in jeopardy since in a locking synchronizing arrangement, the engagement of the reverse gear cannot be excluded with certainty during excessively fast forward motion. Upon clutching-in, the engine can be damaged because of reversal of rotation.
OBJECT OF THE INVENTION
It is the object of the invention to fashion a synchronizing mean such that overloading and thereby a destruction of the synchronizing means and damage to the engine is prevented.
This object is attained with locking synchronizing means for transmission shifting, in which a carrier for a sliding sleeve and a gear rotating at a different speed of rotation are coupled together rigidly at synchronism by means of an axially slidable annular sliding sleeve. A coupling tooth array of the sliding sleeve engages a corresponding spur gearing of the sliding. sleeve carrier and the coupling tooth array of the gear as well. Engagement pins are positioned between the sliding sleeve carrier and sliding sleeved and in uncoupled condition, engage in a recess of the interior of the sliding sleeve and have pressure surfaces which are in effective connection with pressure surfaces on a synchronizing ring. The latter which is positioned axially between the sliding sleeve carrier and the gear, and is capable of being entrained by the sliding sleeve carrier circumferentially, with play, in both directions, via dogs. Portions of the gear together with portions of the sychronizing ring form a power-transmitting coupling system having friction surfaces and with locking teeth on the synchronizing ring for the temporary lockout of the axial motion of the sliding sleeve.
according to the invention, the locking action of the locking teeth is limited even during prevailing difference in speed of rotation and is cancelled as a function of the warming of the synchronizing ring or by an increase of the unlocking force and/or a reduction of the friction moment. Grinding noises are generated upon axial motion of the sliding sleeve in the direction toward the coupling tooth array during a preaviling excessive difference in speed of rotation. These grinding noises cause the driver to complete the shifting operation only after applying means of synchronizing speed of rotation.
An overloading of the synchronizing means is prevented with certainty by doing away with the locking action in the face a prevailing differential speed of rotation between the elements to be connected, namely the sleeve and gear. If this achieved by warming of the synchronizing ring, then the latter expands detaches itself from the friction cone of the gear because it bears axially against the gear. The friction moment on the cone collapses, and due to the effect of the unlocking force from the axial force of the sliding sleeve on the locking tooth of the sych
REFERENCES:
patent: 2930462 (1960-03-01), Willis
patent: 3247937 (1966-04-01), Ivanchich
patent: 3270843 (1966-09-01), Ivanchich
patent: 3861509 (1975-01-01), Inoue et al.
patent: 4108424 (1978-08-01), Rizzo
patent: 4300668 (1981-11-01), Nozawa et al.
patent: 4378710 (1983-04-01), Knodel
patent: 4413715 (1983-11-01), Michael et al.
patent: 4811825 (1989-03-01), Christian et al.
patent: 4817773 (1989-04-01), Knedel et al.
Fiechtner Heinz
Lutz Rolf
Reinalter Franz
Bonck Rodney H.
Dubno Herbert
Zahnradfabrik Friedrichshafen AG
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