Hydraulic Tool Mount Sealing Piston With Double-Seal Wear Relief
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Solution Overview
Problem
Hydraulic tool mounts face challenges in maintaining tightness over time due to wear of the sealing piston, especially during repetitive clamping and unclamping operations, leading to decreased sealing effectiveness and potential fluid leakage.
Innovation Solution
A sealing piston design featuring a pin, a seal with a circumferential sealing lip, and a head that form a stack, providing a double sealing effect by combining the seal's abutment against the bore's inner wall with the head's abutment against a sealing seat, which relieves pressure on the seal and reduces wear, thereby enhancing the sealing piston's service life and minimizing micro-leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sealing piston is made movable to enable clamping and unclamping operations, then operational functionality is improved, but sealing tightness deteriorates over time due to wear
Solution Approach 1:
The sealing piston is segmented into three distinct components arranged in a stack: a pin (actuation element), a seal (sealing element), and a head (pressure distribution element). This segmentation allows each component to perform its specific function independently, with the seal focused purely on sealing while the pin provides actuation and the head distributes pressure, thereby maintaining sealing effectiveness despite movement.
Solution Approach 2:
The seal acts as an intermediary element between the pin and the head, and between the sealing piston and the bore wall. This intermediary seal element transfers the actuation force from the pin while maintaining the sealing interface, allowing movement to occur without direct contact between the pin and the sealing surface, thus reducing wear on the sealing interface.
2Reliability
If pressure is exerted on the seal to maintain sealing effect, then sealing tightness is improved, but wear on the seal increases leading to reduced service life
Solution Approach 1:
The head is designed with a specific geometry (convex front end) that locally concentrates pressure at the sealing interface where the seal contacts the bore wall, while distributing pressure away from the seal in other areas. This local quality approach ensures adequate sealing pressure is applied exactly where needed without subjecting the entire seal to excessive pressure that would cause wear.
Solution Approach 2:
Instead of applying pressure directly to the seal through the pin, the design inverts the pressure application sequence by having the head press against the seal, which then presses against the bore wall. This inversion allows the seal to maintain contact and sealing while the pressure is applied through a larger surface area (the head), reducing stress concentration and wear on the seal material.
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 double sealing effect significantly reduces wear on the seal and minimizes fluid leakage, ensuring the hydraulic tool mount maintains tightness and operational efficiency throughout its service life.
Implementation Method 1
The seal comprises a circumferential sealing lip for abutment and sealing against an inner wall of the bore in order to achieve a first sealing effect
Implementation Method 2
the head abuts the sealing seat and thereby closes the bore in order to achieve a second sealing effect. When the sealing piston is inserted, the head closes the bore more and more as it is moved inward and the pressure of the pressure chambers acts more on the head and less on the seal
Implementation Method 3
A fluid is disposed in the pressure chamber, which itself presses on a wall, e.g. an expansion sleeve, in which a tool or workpiece can be clamped
Data Source
AI summary
The invention relates to a hydraulic tool mount having a bore into which a sealing piston is inserted, wherein the sealing piston comprises a pin, a seal and a head which are arranged one behind the other in an axial direction (A) and thus form a stack, wherein the seal comprises a circumferential sealing lip for abutment and sealing against an inner wall of the bore in order to achieve a first sealing effect, and the bore comprises a sealing seat which, when the sealing piston is inserted, forms a stop for the head in axial direction (A), so that, in an end position of the sealing piston, the head abuts the sealing seat and thereby closes the bore in order to achieve a second sealing effect. The invention further relates to a corresponding sealing piston.