Hydraulic Buffer Piston Seat Geometry for Oil Flow Noise Suppression
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Solution Overview
Problem
Existing pistons for hydraulic buffers generate sound as oil passes through them, which is not effectively suppressed.
Innovation Solution
A piston design featuring a cylindrical body with first and second through-holes and a seat allowing a planar valve to be seated, where the seat includes an opening surface, a seating surface, and intermediate portions between the end face and the seating surface, which helps to gradually change the flow velocity of the oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If oil passes through the piston with conventional design, then oil flow is achieved, but sound is generated
Solution Approach 1:
The seat is divided into multiple segments: opening surface, seating surface, and intermediate portions. This segmentation allows the oil flow path to be divided into multiple stages, with each stage gradually changing the flow velocity. The intermediate portions create stepped flow paths that reduce sound generation while maintaining oil flow functionality.
Solution Approach 2:
The seat design dynamically adjusts the flow velocity of oil through its geometric structure. The intermediate portions create a progressive change in flow cross-section, transforming the oil flow from high velocity to lower velocity in a controlled manner. This dynamic flow velocity adjustment suppresses sound generation while ensuring adequate oil flow for buffer operation.
2Ease of manufacture
If the seat structure is simplified, then manufacturing is easier, but sound suppression is reduced
Solution Approach 1:
The seat incorporates localized geometric features (intermediate portions with specific heights and positions) that target the sound generation problem at specific locations in the oil flow path. These local structural modifications are integrated into the overall seat design, maintaining manufacturing feasibility while achieving sound suppression through localized flow velocity control.
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 piston effectively suppresses sound generation by gradually decreasing or increasing the flow velocity of the oil in steps during extension and compression strokes, respectively.
Implementation Method 1
The intermediate portions provided between the end face and the seating surface... gradually decreasing or increasing the flow velocity of the oil in steps
Data Source
AI summary
A piston includes a body of a cylindrical shape and a seat protruding axially from an axial end face of the body. The body includes first through-holes and second through-holes axially extending through the body. The seat allows a planar valve to be seated thereon and includes: bottom surfaces each including an opening for a through-hole formed at a position facing the corresponding first through-hole; a seating surface provided around each bottom surface so as to protrude from the bottom surface; and intermediate portions provided between the end face and the seating surface. The seating surface allows the valve to be seated thereon.