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Electrically actuated synchronizer for a vehicle transmission

a technology of electric actuation and synchronizer, which is applied in the direction of mechanical actuators, mechanical apparatus, gears, etc., can solve the problems of bulky shifting actuators, high cost, and high cost of synchronizing the output sha

Inactive Publication Date: 2003-10-30
BORGWARNER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Friction between the cone surfaces of the blocking ring and the shift gear causes the shift gear to begin turning at the same speed as the outer sleeve, and thus the speed of the output shaft.
Such shifting actuators are bulky and require sophisticated linkages that can be improved upon.

Method used

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  • Electrically actuated synchronizer for a vehicle transmission
  • Electrically actuated synchronizer for a vehicle transmission

Examples

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Embodiment Construction

[0014] The following discussion of the embodiments of the invention directed to an electrically actuated synchronizer for a vehicle transmission is merely exemplary in nature, and is in no way intended to limit the invention or its applications or uses.

[0015] FIG. 1 is a perspective view of a synchronizer assembly 10 for use in a vehicle transmission, according to an embodiment of the present invention. Synchronizer assemblies are well known in both manual and automatic transmissions for synchronizing the speed of an output shaft of the transmission to the speed of the desired shift gear during a shift, as discussed above. Therefore, the components of the vehicle transmission are not shown in this diagram, but would be well understood to those skilled in the art. As will be discussed in detail below, the synchronizer assembly is electrically actuated to provide speed synchronization between the gear and the output shaft. The electrically actuated design of the synchronizer assembly ...

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PUM

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Abstract

A synchronizer assembly for a vehicle transmission, where the synchronizer assembly is electrically actuated during a shift. The assembly includes a sleeve having an inner surface and an outer surface. A rotor is rotably mounted to the outer surface of the sleeve and a shift collar is axially mounted to the inner surface of the sleeve. The rotor is threadably coupled to the shift collar so that when the rotor rotates, the shift collar moves in an axial direction relative to the sleeve. An armature coil is electrically coupled to the rotor to cause it to rotate. Keys are rigidly secured to the shift collar to maintain the orientation of the shift collar while it moves. The shift collar locks a shift gear to the transmission output shaft during a shift.

Description

[0001] 1. Field of the Invention[0002] This invention relates generally to a synchronizer for a vehicle transmission and, more particularly, to a synchronizer for a vehicle transmission, where the synchronizer is electrically actuated.[0003] 2. Discussion of the Related Art[0004] As is well understood in the art, vehicles that are powered by an internal combustion engine require a transmission for shifting between gears to effectively transmit the power generated by the engine to the vehicle wheels. Modern transmissions for both manually shifted and automatically shifted gears require precise alignment between the speed of the desired shift gear and the output shaft of the transmission during a shift to prevent gear clashing, and thus gear damage. The desired shift gear is disposed around and is freely rotatable relative to the output shaft when it is not being used to deliver engine power to the output shaft of the transmission. It is necessary to synchronize the rotation of the sh...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16D23/02F16D23/04F16D23/06F16D27/00F16H63/30
CPCF16D23/04F16D23/06F16D27/004F16D28/00F16D2023/0631F16D2023/0687Y10T74/19251F16H2063/3093F16H2063/3063F16H2063/3046Y10T74/19372Y10T74/19284F16H63/304
Inventor VUKOVICH, WILLIAMKOENIG, MELISSAMARTIN, R. KEITH
Owner BORGWARNER INC