Cylinder Liner Structure With Separate Coolant Sealing Insert
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Solution Overview
Problem
Cylinder liners face challenges in balancing structural integrity and sealing effectiveness, particularly in the lower coolant sealing region, where incorporating sealing grooves compromises liner structure and poses issues during engine overhauls.
Innovation Solution
A liner design with a thick middle portion transitioning to a thin portion at an acute angle, combined with a stainless steel insert radially surrounding the liner, which includes sealing grooves for o-rings to create a seal without compromising the liner's thickness, allowing for effective sealing and ease of reconditioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing grooves are provided in the liner for sealing elements, then sealing effectiveness is improved, but liner structure is compromised
Solution Approach 1:
The sealing system is divided into two independent components: the liner and the separate sealing ring assembly. The sealing grooves are provided in the sealing ring assembly rather than the liner, allowing the liner to maintain its structural integrity while the sealing function is provided by the separate component that can be independently replaced during overhauls.
Solution Approach 2:
The sealing grooves and sealing elements are extracted from the liner structure and placed in a separate sealing ring assembly. This extraction allows the liner to be optimized for structural strength while the sealing function is provided by a dedicated separate component that can be easily removed and replaced.
2Reliability
If sealing grooves are accommodated in the liner, then sealing function is provided, but liner thickness becomes undesirable and block reconditioning becomes difficult
Solution Approach 1:
The sealing system is segmented into the liner and a separate sealing ring assembly. The sealing grooves are provided in the sealing ring assembly, allowing the liner to maintain optimal thickness for manufacturing and installation while the sealing function is provided by the separate replaceable component.
Solution Approach 2:
The sealing ring assembly is designed as a disposable or replaceable component that can be easily removed and replaced during engine overhauls without requiring machining or modification of the liner or block. This facilitates cost-effective reconditioning by allowing the sealing components to be recovered and replaced independently.
3Strength
If the liner has uniform thickness, then structural integrity is maintained, but sealing space is insufficient in the bottom portion
Solution Approach 1:
The liner is designed with non-uniform wall thickness, featuring a thicker upper portion for structural integrity and a thinner lower portion that provides adequate space for the sealing ring assembly. This local variation in thickness allows the liner to maintain strength where needed while providing sufficient volume for sealing components in the bottom portion.
Data Source
AI summary
A liner for a cylinder of an internal combustion engine can comprise a hollow cylindrical wall or body having an inner surface, an outer surface opposite the inner surface, and open top and bottom ends. The outer surface can be without any sealing grooves in at least a bottom portion thereof. A relatively thin portion of the wall or body can be provided below a thick portion of the wall or body, and may reach the bottom end of the wall or body. An angled transition can define a change in thickness from the thick portion to the thin portion.