Shaft Rotation Offset System with Damping Elements

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Solution Overview

Problem

Existing shaft rotation offset systems in internal combustion engines face degradation and wear due to significant dynamic forces generated by oscillatory movements of the transmission means, leading to reduced operational efficiency and shorter service life.

Innovation Solution

A shaft rotation offset system equipped with damping elements to reduce dynamic forces, featuring a controlled mobile support element, an actuating element, and elastic means to maintain tension, with damping elements integrated into the support elements and actuation system to mitigate these forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If transmission means are used to connect crankshaft and camshaft, then shaft rotation offset can be achieved, but dynamic forces from oscillatory movements cause degradation and wear

Engineering Contradiction:

Improveshaft rotation offset capabilityVSAvoidtransmission means durability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a damping device connected to the transmission means that absorbs and dissipates dynamic forces generated by oscillatory movements before they can cause degradation or wear. This beforehand cushioning protects the transmission means while maintaining the shaft rotation offset capability.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If damping elements are added to reduce dynamic forces, then reliability improves, but device complexity increases

Engineering Contradiction:

Improvedisplacement device durabilityVSAvoidsystem structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The damping device is designed to perform multiple functions: it reduces dynamic forces from oscillatory movements, maintains tension in the transmission means, and supports the overall structural integrity. This multi-functionality reduces reliability improvements while minimizing the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The system effectively reduces dynamic forces on the displacement device, enhancing its service life and response times, thereby improving the overall operation of the shift system.

Implementation Method 1

The system (10) comprises at least two damping elements (29, 30, 31, 32) shaped to reduce dynamic forces experienced by the displacement device (23) and generated by the transmission means (18)

Methodology Applied

Scientific EffectDamping: Damping

Implementation Method 2

an elastic means for maintaining tension of the transmission means

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP3380706B1System for changing the rotation phase between two shafts both of which are rotatably mounted

Publication Date: 2019.12.25 RENAULT SA

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Figure 3~4

AI summary

The invention relates to a system (10) for offsetting the rotation of two shafts mounted with the ability to rotate about axes that are substantially parallel and that are connected by transmission means (18) passing around coplanar toothed wheels (15, 17) each borne by one shaft. The system (10) comprises a movement device (23) for moving at least one of the branches (20, 22) of the transmission means (18), which device is configured to cause the positions of the two branches (20, 22) to vary. The system comprises a first mobile pressing element (24) made to press against one branch (22) the movement of which is brought about by an actuating element (26), and a second mobile pressing element (25). The system (10) also comprises at least two damping elements (29, 33) configured to reduce the dynamic forces experienced by the movement device (23) and generated by the transmission means (18).