Dual Cam Phaser Single Rotor Phase Adjustment
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Solution Overview
Problem
Dual cam phasers for internal combustion engines are complex and costly to produce due to their intricate construction, which complicates assembly and increases production costs.
Innovation Solution
A dual cam phaser design that uses a single rotor to adjust both camshafts, with a mechanical switching element allowing for phase difference adjustment between coaxial camshafts, reducing complexity and the need for multiple timing sensors and controllers, thus lowering overall mass, assembly time, and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual cam phaser uses separate rotors and hydraulic chambers for each camshaft, then the phase adjustment functionality is complete, but the device complexity and production cost increase significantly
Solution Approach 1:
The patent merges two separate rotor systems into a single rotor that controls both camshafts. The rotor contains two eccentrics that independently adjust the phase of each camshaft, eliminating the need for separate rotors, timing sensors, and controllers for each camshaft, thus reducing device complexity while maintaining full phase adjustment functionality
Solution Approach 2:
The single rotor is designed to perform multiple functions: it controls the phase of both the first and second camshafts simultaneously through its two eccentrics. This multi-functional design replaces what would traditionally require two separate rotor assemblies, reducing the overall number of components while preserving complete adaptability for dual camshaft phase adjustment
2Measurement precision
If a dual cam phaser uses multiple timing sensors and controllers, then the control precision is maintained, but the overall mass and assembly time increase
Solution Approach 1:
The single rotor with dual eccentrics serves as a universal control mechanism that replaces multiple timing sensors and controllers. Each eccentric independently controls one camshaft's phase, maintaining precise timing control while reducing the total number of sensing and control components, thereby reducing overall mass
3Adaptability or versatility
If a dual cam phaser uses multiple timing sensors and controllers, then the control functionality is complete, but the assembly time and production cost increase
Solution Approach 1:
The patent combines multiple control functions into a single integrated rotor assembly. This merger reduces the number of parts that need to be assembled and calibrated, significantly reducing assembly time and production cost while maintaining complete control functionality for both camshafts
Solution Approach 2:
The universal rotor design that controls both camshafts eliminates the need to assemble and calibrate separate control systems for each camshaft, streamlining the assembly process and reducing production time while preserving full adaptability for phase adjustment
Data Source
AI summary
A dual cam phaser for an internal combustion engine, the dual cam phaser including a stator which is drivable by a crankshaft; a rotor which rotatable relative to the stator; a first camshaft; a second camshaft; and a mechanical switching element which is connected to the first camshaft and the second camshaft, wherein the first camshaft and the second camshaft are arranged coaxial with one another, wherein the first camshaft or the second camshaft is connected with the rotor to rotate together with the rotor, and wherein a phase difference between the first camshaft and the second is adjustable by the mechanical switching element.