Cam Shaft Phaser Rotor Stator Torque Transfer

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Solution Overview

Problem

Existing cam shaft phaser configurations, where the stator receives torque from an engine and rotates with respect to the rotor, are not suitable for certain power train configurations.

Innovation Solution

A cam shaft phaser design featuring a rotor with radially outwardly extending protrusions and a stator with radially inwardly extending protrusions and chambers, allowing for rotational torque transfer while enabling the stator to be rotatable with respect to the rotor, thus accommodating different power train configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the stator receives torque from the engine and rotates with respect to the rotor in known configurations, then the phasing mechanism can adjust cam shaft phase, but the configuration is not suitable for certain power train configurations

Engineering Contradiction:

Improvecompatibility with various power train configurationsVSAvoidstructural configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent inverts the traditional torque reception arrangement by having the rotor receive torque directly from the engine while the stator provides rotational torque to another cam shaft phaser. This inversion allows the device to adapt to different power train configurations without requiring fundamental redesign of the internal mechanism.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The rotor-stator configuration is designed to perform multiple functions: the rotor can receive torque from the engine and drive the stator, while the stator can simultaneously provide rotational torque to another cam shaft phaser. This multi-functionality enhances versatility across different power train applications.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Power

If the rotor includes radially outwardly extending protrusions and the stator includes radially inwardly extending protrusions, then torque transfer efficiency is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvetorque transfer efficiencyVSAvoidprotrusion alignment precision

Core Design Contradiction:

PowerVSManufacturing precision

Solution Approach 1:

The protrusions are designed with curved radially outermost surfaces and planar radially innermost surfaces, creating a geometry that facilitates smooth engagement and torque transfer while accommodating reasonable manufacturing tolerances. The curved surfaces distribute contact stresses more evenly compared to sharp edges.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

Different surfaces of the protrusions have different geometric properties - the radially innermost surfaces are planar for precise positioning, while the radially outermost surfaces are curved for smooth torque transfer. This local differentiation optimizes both torque transfer and manufacturability.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the stator is rotatable with respect to the rotor, then phase adjustment capability is enhanced, but mechanical stability decreases

Engineering Contradiction:

Improvephase adjustment capabilityVSAvoidmechanical stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The stator is designed to be rotatable with respect to the rotor, allowing dynamic phase adjustment. The chambers and protrusions work together to enable controlled rotation while maintaining mechanical stability through proper engagement of the radially inwardly extending protrusions with the radially outwardly extending protrusions on the rotor.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10378394B2Cam shaft phaser with crankshaft driven rotor

Publication Date: 2019.08.13 SCHAEFFLER TECHNOLOGIES AG & CO KG

AI summary

A cam shaft phaser, including: an axis of rotation; a rotor arranged to receive torque from an engine and including a plurality of radially outwardly extending protrusions; a stator including a plurality of radially inwardly extending protrusions; and a plurality of chambers. Each chamber is circumferentially bounded by first and second radially outwardly extending protrusions. A respective radially inwardly extending protrusion is located in each chamber.