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Electro-hydraulic hybrid camshaft phaser

a hybrid camshaft and electric-hydraulic technology, applied in the direction of machines/engines, non-mechanical valves, valve arrangements, etc., can solve the problems of speed and/or torque response of hydraulic phasers, and achieve the effect of adjusting the hydraulic actuation

Inactive Publication Date: 2009-05-14
DELPHI TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]Briefly described, a hybrid camshaft phaser in accordance with the invention comprises a conventional vane-type hydraulically-actuated phaser to which is coupled an electric motor and gearbox. The gearbox output shaft is coupled to the phaser rotor. Under engine operating conditions in whic

Problems solved by technology

Under engine operating conditions in which the speed and / or torque response of a hydraulic phaser is poor, the electric motor augments the hydraulic actuation.

Method used

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  • Electro-hydraulic hybrid camshaft phaser

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Embodiment Construction

[0017]Referring now to FIGS. 1 and 2, a first embodiment 100 of an electro-hydraulic hybrid camshaft phaser in accordance with the invention includes a vane-type camshaft phaser 10 comprising a pulley or sprocket 12 for engaging a timing chain or belt (not shown) operated by an engine crankshaft (not shown). A stator 14 is disposed against and rotates with pulley / sprocket 12. Stator 14 is provided with a central chamber 16 for receiving a rotor 18 having a hub 20. Hub 20 is provided with a recess coaxial with a central bore in sprocket 12, allowing access of an end 22 of engine camshaft 24 into rotor hub 20 during mounting of phaser 10 onto an internal combustion engine 26 during assembly thereof. Central chamber 16 is closed by a cover plate 28 (omitted from FIG. 2 for clarity) having a central opening 30, forming advance and retard chambers between the rotor and the stator in chamber 16.

[0018]A power transmission 31 comprises a planetary gear transmission box 32 having an internal...

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PUM

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Abstract

A hybrid camshaft phaser comprising a conventional vane-type hydraulically-actuated phaser to which is coupled an electric motor and gear transmission. The transmission output shaft is coupled to the phaser rotor, optionally via an intermediate clutch mechanism. Under engine operating conditions in which the response of a hydraulic phaser is poor, the electric motor operates to augment the hydraulic actuation. Such conditions include at least low ambient temperatures at which oil viscosities are high, and high ambient temperatures and / or low engine speeds at which oil pressures are low. Preferably, at engine speeds above about 1500 rpm, the electric motor is de-energized.

Description

RELATIONSHIP TO GOVERNMENT CONTRACTS[0001]The present invention was supported in part by a U.S. Government Contract, No. DE-FC26-05NT42483. The United States Government may have rights in the present invention.TECHNICAL FIELD[0002]The present invention relates to camshaft phasers for varying the phase relationship between crankshafts and camshafts in internal combustion engines; more particularly, to such phasers wherein the rotor is actuated either hydraulically or electrically; and most particularly, to a hybrid camshaft phaser (HCP) wherein hydraulic rotor actuation torque is selectively supplemented by electrical actuation torque to improve the speed of response under operating conditions that are borderline for hydraulic actuation alone.BACKGROUND OF THE INVENTION[0003]Camshaft phasers for varying the phase relationship between the crankshaft and a camshaft of an internal combustion engine are well known.[0004]A prior art hydraulically actuated camshaft phaser typically compris...

Claims

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Application Information

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IPC IPC(8): F01L1/34F01L9/02F01L9/04
CPCF01L1/022F01L1/024F01L1/3442F01L2820/032F01L2001/34469F01L2820/01F01L1/352
Inventor LEE, JONGMINTAYE, ELIAS
Owner DELPHI TECH INC
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