Concentric Camshaft Phaser Assembly With Hybrid Hydraulic-Electric Phasing
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Solution Overview
Problem
In dual camshaft phaser systems, maintaining adequate fluid pressure to the hydraulic camshaft phaser furthest from the fluid source is inefficient, requiring increased pump size or energy, which complicates the system's energy budget.
Innovation Solution
The system incorporates an electric camshaft phaser in conjunction with a hydraulic camshaft phaser, where the electric phaser is connected to the stator and rotor, allowing for independent rotation of camshafts and reducing fluid flow path lengths to ensure proper pressure and operation, while the connection plate provides a robust connection for torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the pump size or speed is increased to maintain proper fluid pressure to the hydraulic camshaft phaser furthest from the source, then the fluid pressure is sufficient, but the energy budget and system size increase
Solution Approach 1:
The system divides the camshaft phasing control into two independent segments: a hydraulic camshaft phaser for the first camshaft and an electric camshaft phaser for the second camshaft. This segmentation allows each phaser to be controlled independently with its own actuation mechanism, eliminating the need to pump fluid to the more distant phaser and thereby reducing the energy requirements and pump size while maintaining sufficient fluid pressure for the hydraulic phaser.
2Stress or pressure
If the pump size or speed is increased to maintain proper fluid pressure to the hydraulic camshaft phaser furthest from the source, then the fluid pressure is sufficient, but the system size increases
Solution Approach 1:
The system divides the camshaft phasing control into two independent segments: a hydraulic camshaft phaser for the first camshaft and an electric camshaft phaser for the second camshaft. This segmentation allows each phaser to be controlled independently with its own actuation mechanism, eliminating the need to pump fluid to the more distant phaser and thereby reducing the energy requirements and pump size while maintaining sufficient fluid pressure for the hydraulic phaser.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures efficient fluid pressure distribution, allowing for effective advancement and retardation of camshafts with reduced energy requirements and improved system efficiency by leveraging the electric phaser to alleviate pressure issues in the hydraulic phaser.
Implementation Method 1
Hydraulic fluid is provided under pressure to the two hydraulic camshaft phasers to implement the phasing
Implementation Method 2
an electric camshaft phaser including an output gear arranged to be non-rotatably connected to a second camshaft
Data Source
AI summary
A camshaft phaser assembly, including: an axis of rotation; a hydraulic camshaft phaser including a stator arranged to receive rotational torque and including a plurality of radially inwardly extending protrusions, a rotor arranged to be non-rotatably connected to a first camshaft and including a plurality of radially outwardly extending protrusions circumferentially interleaved with the plurality of radially inwardly extending protrusions, and a plurality of chambers bounded at least in part by the plurality of radially inwardly extending protrusions and the plurality of radially outwardly extending protrusions; an electric camshaft phaser including an output gear arranged to be non-rotatably connected to a second camshaft located concentrically within the first camshaft and an input non-rotatably connected to the stator; and a connection plate non-rotatably connecting the input and the stator. The rotor and the output gear are rotatable with respect to each other about the axis of rotation.