Hydraulic Cylinder End Cap With Snap Ring and Dual O-Ring Sealing

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Solution Overview

Problem

Existing hydraulic cylinder bottom end caps do not allow for the use of a snap ring to couple the bottom end cap to an existing hydraulic cylinder, limiting sealing options.

Innovation Solution

A hydraulic cylinder bottom end cap design that incorporates a snap ring groove and O ring grooves to securely couple the end cap to a hydraulic cylinder using a snap ring and O rings for sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional bottom end cap design is used, then the structure is simple, but it does not allow for snap ring coupling or effective sealing

Engineering Contradiction:

Improvesealing effectivenessVSAvoidend cap structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The end cap is segmented into multiple functional zones with distinct grooves: an upper O-ring groove for sealing, a snap ring groove for mechanical coupling, and a lower O-ring groove for additional sealing. This segmentation allows each groove to perform its specific function independently, achieving reliable sealing and coupling while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the end cap are given different local qualities through the grooves. The upper portion has an O-ring groove for sealing, the middle portion has a snap ring groove for coupling, and the lower portion has another O-ring groove. Each local region is optimized for its specific function, allowing the end cap to achieve multiple objectives simultaneously.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If multiple grooves are added to the end cap, then sealing and coupling capabilities are improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecoupling and sealing optionsVSAvoidend cap fabrication

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The end cap design incorporates multiple grooves that serve different functions: O-ring grooves for sealing and a snap ring groove for mechanical coupling. This multi-functionality allows a single end cap component to achieve both sealing and coupling objectives, reducing the need for additional separate components and simplifying the overall assembly process despite the increased groove complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The grooves are pre-formed into the end cap during manufacturing, with the snap ring groove positioned to receive the snap ring and O-ring grooves positioned to receive the O-rings. This preliminary formation of the grooves during end cap fabrication eliminates the need for separate assembly steps to create these features, making the manufacturing process more efficient despite the increased structural complexity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12305672B1Hydraulic cylinder bottom end cap

Publication Date: 2025.05.20 PELINI MARK

AI summary

The bottom end cap has an outer surface having a first upper O ring groove and a second lower O ring groove. The outer surface has a pressure line aperture therein. The outer surface has a snap ring groove and a third sweep O ring groove. The bottom end cap has a lower portion and an upper portion. The upper portion has a recess therein and the lower portion having a slot therein. The lower portion has a pin hole being located orthogonal to the slot.