Hydraulic Hammer Impact System Subassembly Service

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Solution Overview

Problem

The complexity of hydraulic hammers with many individual components makes servicing difficult, requiring complete disassembly and resulting in high downtime and increased costs due to the need to repair one component.

Innovation Solution

The impact system is designed as a single integral unit comprising a piston, sleeve, accumulator membrane, and seal carrier, allowing for removal and replacement as a whole, reducing the need for disassembly and facilitating faster service.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the hydraulic hammer is designed with many individual components (piston, valve, fluid reservoirs), then the system can be assembled separately, but servicing becomes difficult requiring complete disassembly

Engineering Contradiction:
Improveseparate assembly of componentsVSAvoiddifficulty of servicing
Core Design Contradiction:
Ease of manufactureVSEase of repair

Solution Approach 1:

The hydraulic hammer is divided into modular assemblies (impact system subassembly, hydraulic system subassembly, etc.) that can be manufactured separately but serviced as integrated units. The impact system subassembly contains the piston, valve, and fluid reservoirs as a single serviceable module, allowing repair without complete disassembly while maintaining manufacturing flexibility.

Inventive Principle:
Principle #1Segmentation

2Ease of repair

If complete disassembly is required to repair one component, then all components can be accessed, but machine downtime increases and productivity is lost

Engineering Contradiction:
Improveaccess to componentsVSAvoidmachine downtime
Core Design Contradiction:
Ease of repairVSProductivity

Solution Approach 1:

The impact system subassembly is extracted as a separate serviceable module from the complete hydraulic hammer. This allows the subassembly to be removed and serviced independently when components fail, eliminating the need to disassemble the entire hammer and minimizing machine downtime while maintaining access to all critical components within the subassembly.

Inventive Principle:
Principle #2Taking out (Extraction)

3Ease of repair

If complete disassembly is performed for repair, then component replacement is possible, but repair costs increase

Engineering Contradiction:
Improvecomponent replacementVSAvoidrepair costs
Core Design Contradiction:
Ease of repairVSEase of manufacture

Solution Approach 1:

Multiple individual components (piston, valve, fluid reservoirs) are merged into a single impact system subassembly that is serviced and replaced as one unit. This consolidation reduces repair costs by eliminating the need for complete disassembly and multiple separate repairs, while still allowing replacement of the entire subassembly if needed.

Inventive Principle:
Principle #5Merging (Combining)

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 approach reduces machine downtime and repair costs by enabling the impact system to be serviced and replaced as a single unit, minimizing the need for extensive disassembly and allowing for quicker maintenance.

Implementation Method 1

High pressure fluid is then supplied to the hammer to drive a reciprocating piston

Methodology Applied
Scientific EffectHydraulic pressure: Pressure Increase

Implementation Method 2

The accumulator provides a reservoir for the fluid

Methodology Applied
Scientific EffectAccumulator: Accumulator (energy)

Implementation Method 3

A seal carrier may be disposed external to the piston and configured to connect to the piston

Methodology Applied
Scientific EffectSealing:

Data Source

PatentUS9592598B2Hydraulic hammer having impact system subassembly
Publication Date: 2017.03.14 CATERPILLAR INC
  • US9592598B2 patent drawing
  • US9592598B2 patent drawing
  • US9592598B2 patent drawing

AI summary

An impact system for a hydraulic hammer is disclosed. The impact system may include a piston, a sleeve disposed co-axial with the piston, and an accumulator membrane disposed external to the sleeve. A first seal may be located at an end of the sleeve, and configured to connect the sleeve to the piston. The accumulator membrane may have an extension configured to engage a recess in the sleeve.