Camshaft Phaser Timing Feature Relocation for Sensor Access
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Solution Overview
Problem
The existing SCP camshaft and twin phaser assemblies make it difficult to access and position sensors to detect the angular position of the rear output member, requiring significant modifications to the cylinder block or cylinder head.
Innovation Solution
The timing features are relocated to the side of the phaser remote from the camshaft, with a stator-supported bearing connected to the outer tube and a co-axial inner sleeve connected to the inner shaft, allowing both timing features to be accessible from the front side, facilitating sensor interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the timing features are located on the rear output member, then the camshaft timing control function is achieved, but the sensor accessibility becomes difficult requiring modifications to cylinder block or cylinder head
Solution Approach 1:
The timing features are relocated from the rear output member to the front end plate, changing the spatial dimension of sensor accessibility. This allows sensors to access timing features from the front side of the phaser assembly, eliminating the need for modifications to the cylinder block or cylinder head while maintaining accurate angular position detection capability
2Measurement precision
If the twin phaser assembly is designed with rear output member timing features, then the camshaft timing control function is achieved, but the assembly complexity increases due to required modifications
Solution Approach 1:
By relocating timing features to the front end plate, the invention eliminates the need for complex modifications to the cylinder block or cylinder head. The timing features remain functional for angular position detection while being positioned in a location that does not require additional structural modifications, thereby reducing overall assembly complexity
Data Source
AI summary
An assembly is disclosed which comprises an SCP camshaft 130 and a phaser mounted at one end of the SCP camshaft. The phaser has a stator 112 driven by an engine crankshaft and two output members 114, 116 each fast in rotation with a respective one of the inner shaft 140 and the outer tube 126 of the SCP camshaft 130. Two timing features 160, 172 are provided for enabling respective sensors to determine the angular positions of the inner shaft and the outer tube of the SCP camshaft. In the invention, both timing features 160, 172 are located on the side of the stator 112 remote from the camshaft 130.