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II y l l n d ~ a rI The circuit 01 I,'iglll't.' ()-U 1I111lWH thnl hool(IIljl.IWIl L'yillult'l'''lill lL'l'Il.'''lIH /I -1111111to synchronize the two cylinders. JI'm cxruunlc, l l l l l l ~ the l 'l l lt'IHIIIlM Hltllkp .tI1 cylinders, fluid from the PUIllP is delivered (0 lilt ' blnuk clld I ll' L'ylhllkl I viIiiIIi flow path shown in the upper envelope of the D('V. All cylinder I I'XII-IUh.,IIIiii from its rod end is delivered to the blank unci of cylinder 2. NIlI\.' Ihlll holtl ..It,,'Iii cylinders and the entire pipeline between the cylinders is 'ilbl with IIII ItI:11 returns to the oil tank from the rod end of cylinder 2, as it cxu-u.ls, ViiI IhlJ Ii! For the two cylinders to be synchronized, the piston urea 01 cylilllll'1 " 1111141 I I ~'II:II: the difference between the areas of the piston and rod 1'01' cylimlr I Jhi.IIIIii be shown by applying the continuity equation-which status tlwl lhc: I i l i . i,1 wItIii:III fluid leaves the rod end of cylinder 1 must equal the rate Ht which 1IIIt

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L .J

FIXEDDISPLACE-M NTMOTOR

OVERLOADRELIEF VALVE

REPLENISHINGPUMP

Figure 9 22. Closed-circuit,one-directionhydrostatictransmission.

REPLENISHINGCHECK VALVE

ELECTRICMOTOR

Chapter 9

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L .J

REVERSIBLEPUMP

own separate hydraulic circuit. The two variable displacement piston pump:are attached directly to the diesel engine flywheel housing. ach pump deliver17.6 gpm 66.7 Lpm) at the rated speed of 2400 rpm and 1000 psi 6900 kPa) pressure. The pressure relief valve setting is 2500 psi 17,200 kPa). The two piston motorwhich power the drive sprockets for the two tracks) are mounted inboard cthe main frame. These motors can run with either of two different volumetri

Figure 9 23. Closed-circuit, reversible-direction hydrostatic transmission. Courtesyo Sperry Vickers, Sperry Rand Corp., Troy Michigan.i

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