Importance

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Abstract

In synchronizing mechanisms for clutches having arranged between the clutch body (10) and the axially displaceable gear shift sleeve, each of which are provided with a toothing, a synchronizing ring (14) with teeth (33) having inclined check faces (35, 36) provided on their ends facing the gear shift sleeve, which check faces (35, 36) coact with matching check faces (37, 38) on the ends of the teeth (34) of the gear shift sleeve, it is provided for the purpose of reducing cold scratch that the check faces on the ends of the teeth (34) of the gear shift sleeve are designed asymmetrically in such a manner that the check faces (37) leading in the sense of rotation (28) have a greater axial extension than the check faces (38) trailing in the sense of rotation. This ensures that accelerated synchronization occurs after attainment of synchronous speeds when due to the existence of high braking moments in the transmission, in particular due to the high viscosity of cold transmission oil, the transmission is braked too rapidly in a manner interfering with the synchronization process. A similar effect can be achieved also with the aid of pressure elements which guarantee that the synchronizing ring is rotated radpily into the locked position opposite the sense of rotation. Particularly favorable effects are obtained when the inclined faces described before are employed in combination with such pressure elements.

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