Press-Fit Leakage Detection Ring for Hydraulic Cylinder Heads

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Solution Overview

Problem

Existing fluid leakage detection devices for reciprocating fluid pressure devices, such as hydraulic cylinders, require complex attachment methods involving bolt holes in the cylinder head, making them difficult to attach and increasing the risk of leakage due to seal deterioration.

Innovation Solution

A fluid leakage detection device with an annular member that includes a press-fitted portion, allowing easy attachment to the cylinder head without the need for bolt holes, featuring a passage to guide working fluid from the gap between the piston rod and cylinder head to a pressure sensor for reliable leakage detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the fluid leakage detection device is attached to the cylinder head by means of bolts, then the attachment is secure, but holes for fixing the bolt need to be formed in the cylinder head, making it difficult to attach the device

Engineering Contradiction:

Improveattachment securityVSAvoidattachment ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The attachment structure is divided into two parts: an annular member with a press-fitted portion and a corresponding annular groove in the cylinder head. This segmentation allows the detection device to be attached without requiring bolt holes through the entire cylinder head, thus maintaining security while improving ease of attachment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The press-fitted portion acts as an intermediary element between the annular member and the cylinder head. It provides a secure connection through interference fit within the annular groove, eliminating the need for bolts and hole formation while ensuring reliable attachment

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the fluid leakage detection device is attached without bolt holes, then the attachment is easier, but the secure fastening may be compromised

Engineering Contradiction:

Improveattachment easeVSAvoidattachment security

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The annular groove is pre-formed in the cylinder head at the appropriate location. This preliminary preparation allows the press-fitted portion to be directly installed without requiring additional hole formation or complex fastening operations, achieving both ease of attachment and secure fastening

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The attachment mechanism uses dimensional parameters of the press-fitted portion and annular groove to create an interference fit. By carefully controlling the dimensions and tolerances of these components, secure fastening is achieved without requiring bolts or additional fastening elements

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11225985B2Fluid leakage detection device and reciprocating fluid pressure device

Publication Date: 2022.01.18 KYB CORP

AI summary

A fluid leakage detection device includes: an annular member attached to a cylinder head, the annular member being configured such that a piston rod is inserted through the annular member; a passage formed in the annular member, the passage being configured such that a working fluid is guided to the passage from a gap between an outer circumference of the piston rod and an inner circumference of the cylinder head; and a detector configured to detect the working fluid guided through the passage, wherein the annular member includes a press-fitted portion, the press-fitted portion being configured to be press-fitted to an annular groove formed in the cylinder head.