Synchronizer for mechanical transmissions, particularly for vehicle transmissions
AssigneeDana Graziano S.R.L.
InventorsSilvano Colombo, Andrea Serra
Life of this patent
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Abstract
A synchronizer for mechanical transmissions having a phasing system configured so as to include a plurality of first cavities on an internal cylindrical surface of a rim of a hub, the hub torsionally connected with a transmission shaft, forming the external teeth of the hub and, for each of the first cavities, either a tooth which radially protrudes from an external cylindrical surface of a synchronizing ring of the synchronizer and is arranged to engage in the first cavity, or a connecting pin arranged to engage on one side the first cavity and on the other a respective second cavity on the external cylindrical surface, wherein the first cavities have an arc- or round-shaped cross-section.
Claims11
A synchronizer for mechanical transmissions, the synchronizer being arranged to be mounted on a transmission shaft extending along a longitudinal axis to selectively connect the transmission shaft for rotation with at least one gear wheel idly mounted on said shaft, the synchronizer comprising:
- a hub which is arranged to be torsionally connected with the transmission shaft and is provided with external teeth,
- an actuating sleeve which is slidable in the direction of a longitudinal axis of the transmission shaft and is provided with internal teeth meshing with the external teeth of the hub,
- at least one synchronizing ring which is provided with external teeth arranged to mesh with the internal teeth of the actuating sleeve and has, on its radially internal side, a friction surface arranged to cooperate with a friction surface associated to a respective gear wheel to allow the generation of a friction torque between the synchronizing ring and the associated gear wheel,
- a pre-synchronization system comprising a plurality of blocking elements operatively placed between the hub and the actuating sleeve, and
- a phasing system arranged to ensure a given angular positioning of said at least one synchronizing ring with respect to the hub about said longitudinal axis, the phasing system comprising a plurality of first cavities provided on an internal cylindrical surface of a ring gear of the hub forming the external teeth of the hub;
- wherein said first cavities have an arc- or round-shaped cross-section, including a semi-circular cross-section.
Dependencies are inferred from the claim text.