Hydrostatic Axial Piston Machine Fluid Volume Segmentation

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Solution Overview

Problem

Existing hydrostatic axial piston machines face challenges in designing a fluid volume that is both simple and economical to produce, while minimizing the risk of leakage and environmental impact, and optimizing installation space and efficiency.

Innovation Solution

A hydrostatic axial piston machine design featuring a separate elongated hollow body, sealed between the connection plate and housing, which can be flexibly adapted to machine series and nominal sizes, utilizing depressions for secure connection and reducing churning losses with a circular-cylindrical or kidney-shaped cross section, and employing sealing rings for pressure resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a bottle-like separate hollow body is used to form the fluid volume, then reliability against leakage is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveleakage protectionVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The connection plate is divided into a first connection plate and a second connection plate, with the fluid volume formed between them. This segmentation allows each plate to be manufactured separately with standard sealing interfaces, improving ease of manufacture while maintaining leakage protection through the sealed gap between the two plates.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If a cavity in the connection plate closed by a plug is used, then manufacturing is simplified, but available space for the fluid volume is reduced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidfluid volume space

Core Design Contradiction:

Ease of manufactureVSVolume of stationary object

Solution Approach 1:

Instead of creating the fluid volume within the thickness of the connection plate (2D approach), the invention extends the fluid volume into a third dimension by positioning it between two separate connection plates. This dimensional transition significantly increases the available space for the fluid volume while maintaining manufacturing simplicity through standard plate fabrication.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If a fluid volume extending between connection plate and housing is used, then simplicity and economy of realization are improved, but leakage risk to environment increases

Engineering Contradiction:

Improvestructural simplicityVSAvoidleakage risk

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

Sealing rings are introduced at the interfaces between the connection plates and the housing to create flexible sealing barriers. These sealing rings prevent leakage into the environment while maintaining the structural simplicity of having the fluid volume extend between the connection plate and housing.

Inventive Principle:

Principle #30Flexible shells and thin films

4Stability of the object's composition

If the hollow body is fastened in the connection plate, then structural stability is improved, but forces pushing the hollow body out must be withstood

Engineering Contradiction:

Improvestructural stabilityVSAvoidfastening strength

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The connection plate is segmented into two separate plates, with each plate independently fastened to the housing. This distributes the forces pushing against the fluid volume across two separate fastening interfaces, reducing the strength requirement at each individual interface while maintaining overall structural stability.

Inventive Principle:

Principle #1Segmentation

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 allows for a simple, economical, and flexible realization of the fluid volume, minimizing leakage risks, enabling effective condition monitoring without environmental harm, and enhancing machine efficiency by reducing pressure pulsations and noise.

Implementation Method 1

employing sealing rings for pressure resistance

Methodology Applied

Scientific EffectPressure resistance:

Implementation Method 2

a variation in pressure is associated with an inflow or an outflow of pressurizing medium solely as a result of the compressibility of the pressurizing medium

Methodology Applied

Scientific EffectCompressibility of pressurizing medium:

Data Source

PatentUS10240587B2Hydrostatic axial piston machine

Publication Date: 2019.03.26 ROBERT BOSCH GMBH

AI summary

A hydrostatic axial piston machine includes a pot-like housing, a connection plate that closes the pot-like housing, a rotatably mounted cylinder drum, and pistons arranged in cylinder chambers of the cylinder drum. The cylinder chambers are each alternately connected via a cylinder chamber opening to a low-pressure control opening and a high-pressure control opening of a resting control part. The control part has two switching regions located between the low-pressure and high pressure control openings. A piston reverses its movement direction in a dead center within the two switching regions. In the switching region, the cylinder chambers are connected via a connecting line to a fluid volume arranged in the housing. The fluid volume extends between the connection plate and the housing such that it is sealed to an interior by the connection plate and the housing.