Electromechanical Camshaft Adjuster with Segmented Pot-Shaped Housing
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Solution Overview
Problem
Existing camshaft adjusters face challenges in achieving a compact construction while ensuring effective sealing and lubrication, particularly in manufacturing aspects, especially when using three-shaft mechanisms.
Innovation Solution
The electromechanical camshaft adjuster employs a harmonic drive mechanism with a multi-part housing sealed by static and dynamic seals, featuring a pot-shaped housing part with varying diameters and a collar-shaped housing cover, allowing for a compact design and efficient lubrication through engine oil, with dynamic seals positioned radially to accommodate higher relative speeds and maintain a compact axial construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a three-shaft mechanism is used in the camshaft adjuster, then the adjusting capability and precision are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The housing is divided into multiple parts (first housing part, second housing part, third housing part) that can be assembled in different configurations. This segmentation allows the complex three-shaft mechanism to be manufactured and sealed more easily while maintaining positioning precision, as each housing part can be optimized independently for its specific function.
2Reliability
If multiple seals are used to seal the adjusting mechanism, then the sealing reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The sealing system is segmented into multiple independent seals (first seal, second seal, third seal) positioned at different locations. Each seal addresses specific sealing requirements at different interfaces, ensuring comprehensive sealing reliability while allowing each seal to be optimized for its specific position and function.
Solution Approach 2:
Different sealing solutions are applied at different locations based on local requirements. The first seal, second seal, and third seal are positioned at different interfaces within the housing, with each seal designed to address the specific sealing challenges at its location, thereby achieving overall high sealing reliability without requiring a single complex sealing system.
3Ease of manufacture
If the housing is designed with multiple parts, then the ease of assembly and manufacturing is improved, but the device complexity increases
Solution Approach 1:
The housing is segmented into multiple modular parts that can be manufactured separately and assembled together. This segmentation improves ease of manufacture by allowing each housing part to be produced using optimized manufacturing processes and enables easier assembly and disassembly for maintenance, while the modular design actually reduces overall complexity compared to a monolithic housing.
Solution Approach 2:
The multiple housing parts are designed to fit together in a nested or layered configuration, where the first housing part, second housing part, and third housing part are arranged in sequence. This nesting approach allows compact packaging while maintaining ease of assembly, as each part can be sequentially installed without requiring complex alignment procedures.
Data Source
AI summary
The disclosure relates to an electromechanical camshaft adjuster comprising an electric motor and an adjusting gear, which has a housing with two housing parts that are sealed off with respect to each other by means of a static seal and with respect to the electric motor and a cylinder head by means of two dynamic seals. A first housing part of the adjusting gear has a pot shape that tapers in a stepped manner towards a housing bottom of the housing part, said pot shape having three different inner diameter regions. In the region closest to the bottom with the smallest inner diameter, a stop plate that acts in the circumferential direction is held. In the region with the middle inner diameter, an output ring gear is mounted with play, and in the region with the largest inner diameter, an input ring gear is secured.