Innenzahnradmotor

Moteur à engrenage intérieur

Gerotor motor

Abstract

A fluid pressure operated device including a gerotor (17) including an orbiting and rotating star (27). A balancing plate (19) is biased into engagement by means of pressurized fluid in a space (102), with an adjacent end surface (28) of the star (27). Adjacent the balancing plate (19) is a housing member (21) defining a seal chamber (83), in which is disposed a seal assembly (89), including a support member (91) and a seal member (93) disposed radially inward from the support member. The outer periphery (92) of the support member (91) is disposed radially outward of a tangent circle (TC) of the bolts (11), thereby moving the pivot point (PP) of the balancing plate (19) further outward radially. This results in an improved ability of the balancing plate to follow the end surface of the gerotor star, whether the height of the star is more or less than that of the gerotor ring (23). As a result, volumetric efficiency is improved, even while the manufacturing cost of the gerotor gear set (17) may be reduced.

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Patent Citations (4)

    Publication numberPublication dateAssigneeTitle
    US-3490383-AJanuary 20, 1970Koehring CoHydraulic pump or motor
    US-4741681-AMay 03, 1988Bernstrom Marvin L, Eaton CorpGerotor motor with valving in gerotor star
    US-4976594-ADecember 11, 1990Eaton CorporationGerotor motor and improved pressure balancing therefor
    US-5211551-AMay 18, 1993Eaton CorporationModular motor

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    Publication numberPublication dateAssigneeTitle