Chamfered Cam Ring Axial Stop for Hydraulic Roller Stability
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Solution Overview
Problem
Hydraulic devices with roller vanes experience axial sliding and movement, which can lead to interference with side plates and cavitation, causing damage and power loss due to the need for additional stops that restrict lubricant flow.
Innovation Solution
A chamfered cam ring and axial rail design that creates a cavity for hydraulic fluid passage and acts as an axial stop for the rollers, preventing sliding while maintaining unrestricted fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stop is added to the side plate to prevent roller axial sliding, then roller stability is improved, but the lubricant path in the suction port is restricted leading to cavitation
Solution Approach 1:
The invention transitions from a flat side plate design to a three-dimensional chamfered ring structure. The chamfered ring creates a cavity that provides additional space for lubricant flow, effectively adding a volumetric dimension to solve the flow restriction problem caused by the stop feature.
Solution Approach 2:
The chamfered ring acts as an intermediary component between the side plate and the roller. It provides the stop function to prevent axial sliding while simultaneously creating a cavity that mediates lubricant flow, preventing cavitation by maintaining unrestricted passage of lubricant.
2Ease of operation
If the side plate is modified to include a stop for preventing roller movement, then roller position control is improved, but port area is reduced restricting fluid flow
Solution Approach 1:
The invention uses a chamfered ring structure that adds vertical dimension (cavity depth) to compensate for the horizontal area lost to the stop feature. This allows maintenance of roller position control while preserving sufficient port area for unrestricted fluid flow.
3Loss of energy
If roller vanes are used to reduce power loss from energy conversions, then efficiency is improved, but axial sliding occurs causing interference with side plates
Solution Approach 1:
The chamfered ring with its cavity creates a pre-positioning structure that anticipates and prevents the harmful axial sliding of rollers before it can cause interference with side plates. The cavity provides a buffer zone that stops roller migration in advance.
Data Source
Figure 1
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Figure 1B
AI summary
Various designs for hydraulic devices are disclosed including hydraulic devices that can include a rotor and a ring are disclosed. The rotor can be disposed for rotation about an axis and can have a plurality of plurality of vanes extending therefrom. The ring can be disposed at least partially around the rotor and the ring, and the rotor can be in communication with a port for ingress or egress of the hydraulic fluid to or from adjacent the rotor. The ring defines a cavity adjacent to and in communication with the port, the cavity allows the hydraulic fluid to be disposed adjacent at least one of the plurality of vanes when the at least one of the plurality of vanes is transiting the port.