Oscillating Radial Cylinder Hydraulic Machine Compact Design
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Solution Overview
Problem
Radial hydraulic machines with oscillating cylinders face challenges in reducing dimensions while maintaining capacity and efficiency, particularly due to limitations in spherical contact surfaces and power/discharge conduit sections, leading to increased noise and reduced performance at high pressures and low flow rates.
Innovation Solution
The design incorporates oscillating radial cylinders with internal annular surfaces that create a wider contact band through elastic yielding, allowing for a smaller spherical oscillation surface and improved thrust distribution, along with lateral feeding and discharge through flat external surfaces, using seal rings for abrasion resistance and anti-extrusion prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the spherical oscillation surface is reduced in size to decrease machine dimensions, then the external dimensions are reduced, but the contact band width decreases leading to increased friction and wear
Solution Approach 1:
The patent changes the geometric parameters of the oscillating cylinder, specifically making the oscillation angle greater than 45 degrees and positioning the oscillation axis at a distance from the spherical surface equal to or greater than the cylinder radius. This parameter optimization allows for a smaller spherical oscillation surface while maintaining adequate contact band width through improved geometric configuration
Solution Approach 2:
The patent transitions from a traditional small oscillation angle configuration to a large oscillation angle configuration (greater than 45 degrees). This dimensional change in the oscillation geometry allows the contact band to be maintained or improved even with a reduced spherical oscillation surface, as the larger angle creates a more favorable contact geometry
2Length of stationary object
If the spherical oscillation surface is reduced to minimize machine footprint, then the external dimensions decrease, but thrust distribution becomes inadequate
Solution Approach 1:
The patent optimizes geometric parameters including setting the oscillation axis distance from the spherical surface to be at least equal to the cylinder radius, and the oscillation angle to exceed 45 degrees. These parameter changes ensure that thrust is properly distributed through the reduced spherical surface area, preventing inadequate force distribution while maintaining compact dimensions
3Productivity
If conduit sections are enlarged to increase flow rates, then the flow capacity increases, but the machine dimensions increase
Solution Approach 1:
The patent adopts a large oscillation angle configuration (greater than 45 degrees) which fundamentally changes the geometric arrangement of the oscillating cylinder. This dimensional change in the oscillation geometry allows for more efficient fluid flow paths and larger effective conduit sections within a compact machine footprint, enabling high flow rates without proportional increases in overall dimensions
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 design reduces the external dimensions of hydraulic machines while enhancing flow rates and power transmission efficiency, minimizing noise and friction, and allowing for larger conduit sections, thus overcoming previous limitations in dimensionality and performance.
Implementation Method 1
create contact on a circumference with a band width due to the sole elastic yielding of the materials in a median area of the contact circumference
Data Source
AI summary
A hydraulic machine includes oscillating radial cylinders close to an external shell of a crown or star of cylinder-piston groups. The pistons of the groups are made sliding on a crank shaft with throw or on interposed concentric elements, which create an alternative movement in the oscillating radial cylinders. The oscillating cylinders are placed in contact with a spherical oscillation surface made on a body or shell of the hydraulic machine. A passage of the hydraulic liquid to and from the oscillating radial cylinder, to create feeding and discharge of the cylinder, is formed through at least a flat lateral external surface on the side of the oscillating cylinder, parallel to an oscillation plane of the cylinders, to and from a feeding channel on a lateral body or cover of the hydraulic machine. A seal ring, fitted at least with a contact surface that is resistant to abrasion on the wall of the lateral flat sliding surface, is interposed between the flat lateral surface in contact for passage of the liquid under pressure, and a thrust member is formed on the oscillating cylinders against the spherical oscillation surface outside of the cylinders themselves.