Browse Prior Art Database

Floating Metal Hydraulic Piston

IP.com Disclosure Number: IPCOM000097786D
Original Publication Date: 1961-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Allais, DC: AUTHOR

Abstract

To prevent sticking of the piston in a long hydraulic actuator cylinder 11, a fitted metal piston 12 is provided with a flexible central drive rod 13. The actuator includes a hydraulic inlet member 14 through which hydraulic fluid is supplied against piston 12 to displace the piston within cylinder 11.

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Floating Metal Hydraulic Piston

To prevent sticking of the piston in a long hydraulic actuator cylinder 11, a fitted metal piston 12 is provided with a flexible central drive rod 13. The actuator includes a hydraulic inlet member 14 through which hydraulic fluid is supplied against piston 12 to displace the piston within cylinder 11.

The device also includes a hydraulic outlet device 15 through which the displaced fluid flows. Rod 13 extends through inlet and outlet devices 14 and 15 and is connected at one end to a load to be moved by the actuator. Drive rod 13 is surrounded by a tube member 17 which is secured to rod 13 at the two ends thereof. A hardened pin member 18 extends across the diameter of piston 12 and rigidly connects the center of rod 13 to piston 12 through a coupling member
19.

The three bearing surfaces provided by the assembly are the contact of piston 12 with the inner wall of cylinder 11 and the contacts of tube 17 in passing through the end seals 20 in inlet and outlet devices 14 and 15. Exact alignment of the assembly at the three bearing points is assured by flexing of the central rod 13. Static O-rings 21 also compress to allow freedom of alignment of the tube and rod assembly relative to piston 12. Rod 13 is highly rigid as a column to transmit driving force to the load, but it easily deflects as a slender beam to compensate for small misalignments at the three bearing surfaces. Tube 17 surrounding rod 13 and secured to it at the ends li...