Hydraulic Running Surface Pressure Gradient Grooves
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Solution Overview
Problem
Hydraulic rotating kits, such as hydraulic pump cylinder blocks, face issues with pressure and flow pulsations, as well as noise, due to the existing design of running surfaces which do not effectively manage fluid communication and load conditions.
Innovation Solution
The introduction of pressure gradient grooves with distal ends located outside and inside the pitch circle, allowing overlap, improves fluid communication and reduces noise by optimizing the running surface design for better pressure and flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional running surface design is used, then the structure is simple, but pressure and flow pulsations occur and noise increases
Solution Approach 1:
The running surface is segmented into multiple functional zones through pressure gradient grooves with different distal end positions (inside and outside the pitch circle). This segmentation creates distinct pressure management zones that control fluid flow separately, reducing pressure pulsations and noise while maintaining manageable structural complexity
Solution Approach 2:
The invention adds a dimensional variable to the groove configuration by positioning distal ends at different radial locations (inside and outside the pitch circle). This dimensional change creates a more sophisticated pressure gradient control system that addresses noise and pulsation issues without requiring excessive structural complexity
2Reliability
If pressure gradient grooves with overlapping distal ends are introduced, then fluid communication improves and noise reduces, but manufacturing complexity increases
Solution Approach 1:
Different regions of the running surface are given different groove configurations - some grooves have distal ends inside the pitch circle while others extend outside. This local differentiation optimizes fluid communication and pressure management in specific zones without requiring the entire system to be manufactured with excessive precision
Solution Approach 2:
The invention changes the geometric parameters of the grooves by varying distal end positions relative to the pitch circle. This parameter variation allows optimization of fluid dynamics performance while the parameters remain within manufacturable ranges, balancing reliability improvement with ease of manufacture
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 enhances pressure and flow pulsations in hydraulic drive units, reducing noise and improving the ability to maintain neutral conditions under no load, resulting in a smoother response to user inputs and reduced operational noise.
Implementation Method 1
Hydraulic running surface with pressure gradient grooves
Data Source
AI summary
A hydraulic drive device includes a running surface having a pair of arcuate kidney ports formed thereon. The running surface also includes a plurality of pressure gradient grooves formed on the running surface, each pressure gradient groove having a proximal end adjacent to a respective one of the ends of one of the kidney ports and a distal end. The distal end of one of the pressure gradient grooves associated with one kidney port may overlap the distal end of a pressure gradient groove associated with the other kidney port. The distal end of at least one of the pressure gradient grooves is located outside the circumference of a pitch circle that passes through the center of each kidney port. The distal end of at least one of the other pressure gradient grooves is located inside the pitch circle circumference.