Impulse Scraper Lip Design for Adherent Particle Removal
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Solution Overview
Problem
Existing scrapers fail to reliably remove strongly adhering foreign particles such as ice or dried-on dirt from piston rods, leading to potential contamination of bearing gaps in hydraulic systems, which can cause operational disruptions and material damage.
Innovation Solution
An impulse scraper with an elastically deformable scraper lip and a support element featuring an exponentially progressive spring characteristic, which applies a mechanical scraping impulse to dislodge adherent particles, and an axial stop mechanism to prevent their entry into the bearing gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional scrapers are used with standard friction properties, then the scraper structure remains simple and materials are easy to pair, but the scraper cannot reliably remove strongly adhering foreign particles such as ice or dried-on dirt from the piston rod
Solution Approach 1:
The scraper lip is designed to be elastically deformable rather than rigid, allowing it to dynamically adapt to the piston rod surface and strongly adhering particles. The elastic deformation enables the scraper to conform to surface irregularities and apply varying contact pressures, significantly improving the reliability of particle removal compared to conventional rigid scrapers.
Solution Approach 2:
The invention changes the physical parameters of the scraper lip by selecting materials with specific elastic properties (elastomers or plastics with appropriate hardness and elasticity). This parameter change allows the scraper to transition from a rigid, fixed-contact design to one that can elastically deform and rebound, creating the impulse effect necessary to dislodge strongly adhering particles.
2Reliability
If the scraper lip is made elastically deformable to improve particle removal, then the ability to remove strongly adhering particles improves, but the friction properties and wear resistance of the material pairing become more difficult to optimize
Solution Approach 1:
The scraper assembly employs local quality by using different materials for different components: the scraper lip is made of an elastically deformable material (elastomer or plastic) for effective particle removal, while the support element and holding section are made of more rigid, wear-resistant materials. This localized material differentiation allows each component to perform its specific function optimally without compromising overall wear resistance.
Solution Approach 2:
The scraper assembly functions as a composite structure combining materials with different properties. The elastic scraper lip is paired with rigid support elements and holding structures, creating a composite system that leverages the advantages of both material types: the elastic material provides particle removal effectiveness while the rigid materials provide structural support and wear resistance.
3Reliability
If a mechanical impulse is applied to dislodge strongly adhering particles, then particle removal effectiveness increases, but the risk of damage to the scraper structure or piston rod increases
Solution Approach 1:
The elastic scraper lip acts as a cushioning element that absorbs and moderates the impact forces during the scraping process. Rather than applying a sudden, potentially damaging mechanical shock, the elastic material gradually builds up deformation energy and releases it in a controlled manner, creating an impulse effect that dislodges particles without causing damage to the scraper structure or piston rod surface.
Solution Approach 2:
The invention converts the potentially harmful rigid impact of conventional scrapers into a beneficial elastic impulse. The elastic deformation of the scraper lip transforms what would be a damaging rigid collision into a controlled, reversible deformation cycle that effectively dislodges particles while protecting both the scraper and the piston rod from damage.
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
The impulse scraper effectively removes strongly adhering foreign particles and prevents their entry into the bearing gap, enhancing the reliability and durability of the scraper arrangement, particularly in critical applications like construction machines.
Implementation Method 1
the scraper lip is intrinsically elastically deformable... causes an axial deformation or deflection movement of the scraper lip... A mechanical scraping impulse or breakaway force can thereby be exerted on the foreign particle
Implementation Method 2
the support element is intrinsically deformable in a spring-elastic manner and, in respect of an axial deformation (counter to the main direction of action of the scraper edge), has an exponentially progressive spring characteristic
Data Source
AI summary
An impulse scraper and scraper arrangement for scraping a foreign body off the mating running surface of a machine part is disclosed. The impulse scraper has a holding section and a scraper lip with a scraper edge, extending around the central axis of the impulse scraper, for dynamically contacting and scraping the foreign body off the mating running surface. The scraper lip is intrinsically elastically deformable and, on its peripheral side facing away from the holding section, has one or more annular material weaknesses, each defining a predetermined bending zone of the scraper lip. The scraper lip itself forms an axial stop for a respective longitudinal segment of the scraper lip arranged distally with respect to the axial stop. Alternatively, the scraper lip is arranged on the holding section via a support element, the axial deflection movement of which relative to the holding section is limited by an axial stop.