Adjusting Device Sealed Guide Cylinder Non-Magnetic Bushing
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Solution Overview
Problem
Existing adjusting devices for internal combustion engines, particularly those with sliding cam systems, face challenges such as complex assembly, high friction leading to increased power and cost, and susceptibility to deformations resulting in lubricant leakage, due to the need for multiple seals and precise positioning of components.
Innovation Solution
An adjusting device featuring a tappet assembly with a non-magnetic connection bushing between the guide cylinder and pole core, allowing for a simplified sealing concept with a pressure-tight connection, and generous fabrication tolerances compensated by a floating bearing, reducing the need for complex assembly and minimizing deformation-induced leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple seals are used to prevent lubricant leakage in sliding cam systems, then sealing reliability is improved, but device complexity and friction increase
Solution Approach 1:
The patent extracts the sealing function from multiple separate seals and concentrates it into a single sealing arrangement at the interface between the guide cylinder and cam shaft housing. This is achieved by creating a pressure-tight connection through the non-magnetic connection bushing that integrates the sealing function, eliminating the need for multiple separate seals while maintaining or improving sealing reliability.
Solution Approach 2:
The patent merges the sealing function with the structural connection function by integrating the sealing arrangement into the connection bushing assembly. The non-magnetic connection bushing serves both as a structural connector and as part of the sealing system, combining multiple functions into a single integrated component that reduces overall device complexity.
2Reliability
If multiple seals are used to prevent lubricant leakage, then sealing reliability is improved, but friction and power consumption increase
Solution Approach 1:
The patent removes the excessive friction caused by multiple seals by extracting the sealing function and consolidating it into a single sealing interface. This reduction in the number of sealing surfaces directly reduces the total friction in the system, lowering power consumption while maintaining adequate sealing reliability through the pressure-tight connection design.
3Manufacturing precision
If precise positioning of components is required for assembly, then assembly precision is improved, but assembly complexity and time increase
Solution Approach 1:
The patent segments the adjusting device into modular components including the guide cylinder, non-magnetic connection bushing, and pole core assembly. This segmentation allows each module to be manufactured and assembled independently with standard tolerances, reducing the need for complex precision positioning during final assembly while maintaining overall assembly precision through the designed interfaces between modules.
4Strength
If components are rigidly connected for structural strength, then strength is improved, but susceptibility to deformation increases
Solution Approach 1:
The patent introduces dynamic characteristics into the connection system by using a non-magnetic connection bushing that allows for controlled movement and adjustment. This dynamic connection accommodates thermal expansion, manufacturing tolerances, and operational deformations while maintaining structural strength, preventing the rigid constraints that would lead to deformation and sealing failure.
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 solution provides a cost-effective, reliable, and simplified assembly process with reduced susceptibility to deformations, ensuring efficient operation and minimizing lubricant leakage, while maintaining precise control over valve opening and closing times.
Implementation Method 1
The connection bushing, due to the non-magnetic properties, forms a gap for a magnetic side flux
Data Source
AI summary
An adjusting device having at least one tappet assembly. The at least one tappet assembly comprises a tappet, at least one guide cylinder, and a pole core. The tappet is arranged in the guide cylinder in a movable manner along a longitudinal axis, and a non-magnetic connection socket is arranged between the guide cylinder and the pole core. The guide cylinder and the pole core are arranged at a distance to each other in the longitudinal axis by the connection socket.