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Hydraulic Piston Leakage Control by Capillary Wick System

IP.com Disclosure Number: IPCOM000044990D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Giattino, P: AUTHOR [+2]

Abstract

The hydraulic linear motor consists of a number of pistons 10 with cam followers 12 traveling over a parabolic cam 18. The design lends itself to external leakage of the hydraulic fluid through the piston cavity 16, causing excess fluid on the mechanism assembly and eventually reaching the work surface. Although some leakage may be tolerable for lubrication purposes, excess leakage can be controlled.

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Hydraulic Piston Leakage Control by Capillary Wick System

The hydraulic linear motor consists of a number of pistons 10 with cam followers 12 traveling over a parabolic cam 18. The design lends itself to external leakage of the hydraulic fluid through the piston cavity 16, causing excess fluid on the mechanism assembly and eventually reaching the work surface. Although some leakage may be tolerable for lubrication purposes, excess leakage can be controlled.

The method used for control of leaking excess fluid is to direct the fluid to a location which can capture and store the excess. The parabolic cam 18, mounted on the arm 20, provides a natural path for drawing the fluid by capillary action. When wear strips 22 are used along the top surface of the arm 20, they will also draw fluid thereunder by capillary action. A wicking system 24 is connected to the underside of the cam 18 and wear strip 22 for removing and dispensing fluid to a reservoir 26 for removal or drainage periodically. The already existing manipulator arm 20 can be used as an excess hydraulic fluid reservior, when in a horizontal position, as shown in Fig. 1, by capping the ends.

Fig. 2 shows a second means of controlling minor leakage past the piston seals 30. Immediately after the seals 30, a wick ring 32 is provided in a groove 34 in the motor housing 36. The wick 32 extends into a tube 38 which directs the excess hydraulic fluid into a reservior 40.

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