Ram Piston Overload Assembly With Additive Burst Disc Forces

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Solution Overview

Problem

Existing hydraulic tools with overload assemblies face issues of leakage and reduced fatigue life due to opposing forces acting on the burst disc, leading to inefficient sealing and premature wear.

Innovation Solution

The integration of a burst disc and overload assembly components into a ram piston, where hydraulic pressure reaction forces and supporting forces act additively, enhancing sealing efficiency and reducing wear on the burst disc.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the supporting force on the burst disc is increased to achieve better sealing, then sealing efficiency is improved, but the fatigue life of the burst disc is reduced

Engineering Contradiction:

Improvesealing efficiencyVSAvoidfatigue life of burst disc

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention inverts the conventional force arrangement by positioning the lock nut and burst disc at opposite ends of the ram cavity, so that both the hydraulic pressure reaction force and the supporting force from the lock nut act in the same direction on the burst disc, rather than in opposite directions. This inversion allows the forces to be additive, achieving better sealing without increasing the supporting force excessively, thereby preserving the fatigue life of the burst disc.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the supporting force from the lock nut is increased to counteract hydraulic pressure, then sealing is improved, but the force required to seal the burst disc increases excessively

Engineering Contradiction:

ImprovesealingVSAvoidforce required to seal burst disc

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The invention inverts the conventional force arrangement by positioning the lock nut and burst disc at opposite ends of the ram cavity, so that both the hydraulic pressure reaction force and the supporting force from the lock nut act in the same direction on the burst disc. This inversion allows the forces to be additive, achieving better sealing without increasing the supporting force excessively.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention utilizes the hydraulic pressure reaction force itself to contribute to the sealing of the burst disc. By configuring the overload assembly so that the hydraulic pressure reaction force acts in the same direction as the supporting force from the lock nut, the system makes the hydraulic pressure serve a dual purpose: both driving the piston and assisting in sealing the burst disc, thereby reducing the burden on the lock nut.

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If the lock nut and burst disc are positioned with a spacer between them, then assembly is simplified, but opposing forces cause leakage at the burst disc

Engineering Contradiction:

Improveassembly simplicityVSAvoidsealing at burst disc

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention inverts the conventional force arrangement by positioning the lock nut and burst disc at opposite ends of the ram cavity, so that both the hydraulic pressure reaction force and the supporting force from the lock nut act in the same direction on the burst disc. This inversion allows the forces to be additive, achieving better sealing without increasing the supporting force excessively, thereby preserving the fatigue life of the burst disc.

Inventive Principle:

Principle #13The other way round (Inversion)

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

This configuration improves sealing at higher pressures, extends the fatigue life of the burst disc, and maintains effective sealing without excessive force, addressing leakage and wear issues in hydraulic tools.

Implementation Method 1

hydraulic pressure can be created in the ram chamber, by which a hydraulic pressure reaction force acts on the lock nut and a supporting force from the lock nut acts on the burst disc

Methodology Applied

Scientific EffectHydraulic pressure: Pressure Increase

Data Source

PatentUS11999042B2Hydraulic tool having ram piston with integrated overload assembly

Publication Date: 2024.06.04 MILWAUKEE ELECTRIC TOOL CORP

AI summary

Embodiments of the invention provide a ram assembly for a hydraulic tool. The ram assembly includes a ram piston having a ram cavity. The ram piston receives a hydraulic pressure reaction force. The ram assembly further includes an overload assembly disposed in the ram cavity or in a cavity defined by a manifold. The overload assembly includes a burst disc positioned at a first end of the ram cavity or manifold, a lock nut positioned at a second end of the ram cavity or manifold, and a spacer positioned between the burst disc and the lock nut. The spacer transfers a supporting force applied to the lock nut to the burst disc. The hydraulic pressure reaction force and the supporting force both act in the same direction, and thus, are additive forces acting on the burst disk.