Title:
CAM TORQUE ACTUATED - TORSIONAL ASSIST PHASER
Document Type and Number:
WIPO Patent Application WO/2012/061234
Kind Code:
A3
Abstract:
A variable cam timing phaser for an internal combustion engine includes a housing (10) and a rotor (20) connected coaxially with respect to a camshaft for rotation relative to one another. The housing (10) and the rotor (20) can define at least one cavity (10a) with a vane (22) dividing each cavity (10a) into a first chamber (16) and a second chamber (18). A control valve (24) can have a longitudinally reciprocal spool (36). The spool (36) can move between an advance timing position and a retard timing position within a Cam Torque Actuated mode of operation, an advance timing position within a Torsional Assist mode of operation, and at least one null position. The spool (36) can connect the first chamber (16), the second chamber (18), a check valve (40) and an actuating fluid supply source (46) with respect to one another, and can connect a passage (62) associated with a lock pin (60) between an exhaust vent (48a, 48b) and the actuating fluid supply source (46).
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Inventors:
WIGSTEN MARK (US)
Application Number:
PCT/US2011/058305
Publication Date:
July 19, 2012
Filing Date:
October 28, 2011
Export Citation:
Assignee:
BORGWARNER INC (US)
WIGSTEN MARK (US)
WIGSTEN MARK (US)
International Classes:
F01L1/34; F01L1/344; F01L13/00
Domestic Patent References:
| WO2009114500A1 | 2009-09-17 |
Foreign References:
| US20040099232A1 | 2004-05-27 | |||
| US5207192A | 1993-05-04 | |||
| US7137371B2 | 2006-11-21 |
Attorney, Agent or Firm:
HELMHOLDT, Thomas et al. (3408 Greenspring LaneRochester Hills, Michigan, US)
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