A Unitized Piston Design for Hydraulic Cylinder Applications

790830

02/01/1979

Event
1979 SAE International Off-Highway and Powerplant Congress and Exposition
Authors Abstract
Content
A new unitized piston design provides important opportunities for progress in mobile equipment hydraulic cylinder applications.
Improved bearing and sealing characteristics and tighter dimensional tolerances permit shorter cylinders and permit higher working hydraulic pressures, which in turn permit use of smaller, lighter, more energy efficient hydraulic equipment.
In production, a steel body has nylon bearing material injection molded onto the OD. A groove machined in the periphery retains a rubber loader ring and a teflon piston seal ring.
Tests demonstrate negligible piston seal ring wear, volumetric efficiency better than 99.998 percent (dynamic), and drift less than 0.0015 in. (0.0381 mm) per hour (static).
Meta TagsDetails
DOI
https://doi.org/10.4271/790830
Pages
12
Citation
Rudd, T., "A Unitized Piston Design for Hydraulic Cylinder Applications," SAE Technical Paper 790830, 1979, https://doi.org/10.4271/790830.
Additional Details
Publisher
Published
Feb 1, 1979
Product Code
790830
Content Type
Technical Paper
Language
English