Cam Phaser Check Valve Plate Radial Clearance Alignment

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Solution Overview

Problem

The assembly of cam phasers is complicated by the need for precise alignment of components, which is difficult to maintain due to loose parts that can rotate inadvertently, leading to potential misalignment and assembly challenges.

Innovation Solution

The cam phaser design includes a check valve plate with radial clearance and axially extending bosses to ensure proper alignment during assembly, allowing for secure connection to either the stator or locking cover, preventing rotation and facilitating alignment of fastener openings, fluid openings, and locking features.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If loose components are used during assembly, then ease of handling is improved, but alignment precision deteriorates due to inadvertent rotation

Engineering Contradiction:
Improvehandling of partsVSAvoidalignment of components
Core Design Contradiction:
Ease of operationVSManufacturing precision

Solution Approach 1:

The patent introduces temporary alignment features (alignment pins, registration features, or fixture elements) that act as intermediaries between loose components during assembly. These features guide the components into proper alignment without requiring them to be permanently fixed, thus maintaining ease of handling while ensuring manufacturing precision. The alignment features are removed or discarded after assembly is complete.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Manufacturing precision

If components are firmly fixed during assembly, then alignment precision is improved, but device complexity increases due to additional alignment mechanisms

Engineering Contradiction:
Improvealignment of componentsVSAvoidalignment mechanisms
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent incorporates alignment features directly into the component designs themselves (such as built-in alignment pins, registration slots, or self-aligning geometries) rather than requiring separate alignment mechanisms. These features are designed into the components before assembly, enabling precise alignment through the natural geometry of the parts without adding complex external alignment devices.

Inventive Principle:
Principle #10Preliminary action

3Manufacturing precision

If multiple alignment features are added, then manufacturing precision is improved, but ease of manufacture deteriorates

Engineering Contradiction:
Improvealignment of componentsVSAvoidassembly process
Core Design Contradiction:
Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent divides the alignment function into separate, modular features that can be independently manufactured and then combined during assembly. Rather than creating one complex alignment mechanism, the alignment is achieved through multiple simple features (such as separate alignment pins, individual registration features, or distributed alignment elements) that are easier to manufacture individually but work together to provide precise alignment.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS10544715B1Cam phaser assembly
Publication Date: 2020.01.28 SCHAEFFLER TECHNOLOGIES AG & CO KG
  • US10544715B1 patent drawing
  • US10544715B1 patent drawing
  • US10544715B1 patent drawing

AI summary

A cam phaser is disclosed including a stator, a rotor positioned in the stator and including a locking pin, and a locking cover including a receiving element for receiving the locking pin. A cover plate is arranged on an opposite side of the stator from the locking cover. A check valve plate is positioned between the stator and one of the locking cover or the cover plate and including a plurality of valve elements. A plurality of fastener openings are defined in each of the stator, the locking cover, and the check valve plate. Fasteners extend through the fastener openings. In one embodiment, a radial clearance is defined between the fastener openings in the check valve plate and the fasteners. In one embodiment, at least one axially extending boss is formed around at least one fastener opening of the fastener openings formed in the check valve plate.