Hydraulic Pump Sealing Ring Reduces Friction and Leakage
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Solution Overview
Problem
Hydraulic pumps with rotary cylinder axial-piston or radial-piston designs face challenges in achieving high sealing efficiency without incurring significant friction losses or hydraulic fluid leaks, particularly at higher pressures and partial cylinder capacities, leading to reduced volumetric and energy efficiency.
Innovation Solution
A sealing ring design for hydraulic pump distributors featuring a continuous sealing ring with axial and radial clearance, circumferential-contact bosses, compression-decompression tracks, and flexible sealing gaskets, which reduces leakage flows and friction losses while maintaining robustness and longevity, suitable for various hydraulic pump types and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feed face and distribution face are kept in sealed contact through load application, then sealing efficiency is improved, but friction losses increase
Solution Approach 1:
A thin, flexible sealing ring is introduced as an intermediary element between the feed face and distribution face. The sealing ring carries the contact load, allowing the faces to remain in sealed contact while reducing direct friction between the faces themselves. The sealing ring deforms elastically to maintain sealing while accommodating relative movement.
Solution Approach 2:
The sealing ring is designed as a thin, flexible component that can deform elastically under pressure and during relative movement between the feed and distribution faces. This flexibility allows the ring to maintain continuous sealing contact while accommodating the dynamic operating conditions, reducing the need for high contact loads and thus reducing friction losses.
2Ease of manufacture
If a small clearance is left between cylinders for sealing in radial-piston pumps, then manufacturing complexity is reduced, but hydraulic fluid leaks increase
Solution Approach 1:
The sealing ring acts as an intermediary sealing element that compensates for the larger clearance between the cylinders. Instead of relying on precise machining to achieve tight clearances, the flexible sealing ring adapts to the actual gap and provides effective sealing, thereby reducing hydraulic fluid leaks while allowing for easier manufacturing.
3Reliability
If high pressure is applied to maintain sealing between faces, then sealing efficiency is improved, but volumetric efficiency decreases due to increased leaks
Solution Approach 1:
The flexible sealing ring maintains effective sealing at lower contact pressures compared to rigid face-to-face sealing. The ring's elasticity allows it to conform to the surfaces and maintain sealing integrity without requiring high applied pressures, thereby reducing the pressure differential that drives leakage and improving volumetric efficiency.
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 sealing ring enhances the energy and volumetric efficiency of hydraulic pumps, reduces friction losses, and is cost-effective, allowing for high-energy efficiency in hydraulic systems, including motor vehicle propulsion systems, while being durable and adaptable to different fluid types.
Implementation Method 1
at least one compression-decompression sealing gasket (28) which performs sealing between the stator-side ring face (23) and the bottom and/or the axial or radial sides of the ring groove (16)
Implementation Method 2
the pressure exerted by the hydraulic fluid on the cross section of the port subjected to the higher pressure
Implementation Method 3
the said reaction force results in friction losses which reduce the energy efficiency of the pumps designed in this way
Data Source
AI summary
A hydraulic pump distributor sealing ring for a hydraulic distributor of a hydraulic pump, includes a continuous sealing ring housed in a ring groove formed in a pump stator whose inlet-delivery ports are each aligned with a distribution opening passing right through the ring in the direction of its thickness, this ring including a circumferential-contact boss which has a circumferential line of contact that can come into contact with a rotor-side low-pressure sealing surface, the ring also including a compression-decompression track, a ring sealing lip that provides sealing between the ring and the ring groove, and rotation-proofing elements.