Patent ID: 8528435

Claim:
Transmission synchronization device with at least one synchronizer hub which can be arranged on a shaft, on which synchronizer hub at least one synchronizer ring is arranged opposite in axial direction, at least one gear wheel arrangeable on the shaft, at least one friction packet, which is arranged below the synchronizer ring and is in operating connection therewith, and with at least one sliding sleeve arranged above the synchronizer hub, which sliding sleeve has an internal connector toothing for non-rotatable connection with the shaft and an outer sleeve toothing, whereby between the gear wheel and the synchronizer ring a coupling body is arranged and whereby the synchronizer hub comprises at least one recess in which at least one spring-loaded power assist element is arranged, which comprises a base body, a height and—as viewed in plan view—a longitudinal extension and a lateral extension, whereby the longitudinal extension in circumferential direction of the synchronizer hub and the lateral extension are formed or arranged in the direction of the width of the synchronizer hub in axial direction, and which in the direction of the longitudinal extension comprises two opposite distal end sections, whereby in at least one end section, a functional surface is formed, which cooperates with the synchronizer hub, and which in the distal end section(s) is or are inclined at an acute angle to the greatest longitudinal extension of the base body, whereby on the base body between the two distal end sections a central elevation for engagement in a sliding sleeve groove is formed on a bottom of the sliding sleeve, whereby the central elevation comprises at least one additional functional surface, which can be brought into operating connection with the sliding sleeve, wherein the at least one additional functional surface of the central elevation is inclined in the direction of the lateral extension and the sliding sleeve groove comprises complementary inclined bearing surfaces against which the at least one additional functional surface bears, wherein also the synchronizer hub underneath the sleeve toothing and above the connector toothing in the recess to the functional surfaces has oblique function surfaces running at least approximately at a supplementary angle to the acute angle of the distal end sections of the power assist element, for which reason the synchronizer hub comprises an annular web extending in circumferential direction, on which said functional surfaces are formed, and wherein a spacing in circumferential direction between the two functional surfaces is such that the power assist element is arranged with play between the functional surfaces of the distal end sections and the functional surfaces in the recess, i.e. axial displacement of the power assist element is possible in the recess or in neutral position the power assist element bears against the functional surfaces and during the synchronization slides thereon via axial displacement.