Abstract The invention relates to a rotary piston type machine in which an externally toothed wheel and an internally toothed ring form displacement chambers, and one of the toothed elements is connected by way of a universal joint shaft to a rotary slide which, together with a valve part connected to the other toothed element, forms a diversion valve. In such machines the connection between the one toothed element and the associated rotary slide, by way of the universal joint shaft, results in a certain amount of play. This causes leading and lagging between cooperating valve parts with the result that the machine suffers a loss in capacity because of imprecise control of the rotary slide. The lead and lag angles are even greater if the universal joint shaft is coupled to the main shaft and undergoes additional torsion with increasing input and output capacity of the machine. Means are provided to slightly rotate one of the valve elements relative to the main shaft in the reversed direction to compensate for the leading or lagging tendencies referred to.
A rotary piston machine comprising a housing, relatively rotatable toothed members for forming expansible and contractible chambers with at least one of said members being a movable toothed member which is movable relative to said housing, rotatable valve means, stationary valve means cooperable with said rotatable valve means, shaft means connecting said movable toothed member and said rotatable valve means, there being unavoidable circumferential play between said movable toothed member and said rotatable valve means, hydraulically operated means for adjustingly moving said rotatable valve means relative to said movable toothed member to compensatingly provide synchronous alignment and registration of the respective valve porting means between said movable and stationary valve means, said rotatable valve means having the form of a sleeve with end faces exposed to and acted upon by both inlet and outlet fluids respectively, said rotatable valve means having inclined slot means in fluid communication with said inlet fluid, and pin means cooperable with said slot means and being carried by said main shaft to cause said moving of said rotatable valve means relative to said movable toothed member.
Claim 2
Dependent Claim
181 words
A rotary piston machine comprising a housing, relatively rotatable toothed members for forming expansible and contractible chambers with at least one of said members being a movable toothed member which is movable relative to said housing, rotatable valve means, stationary valve means cooperable with said rotatable valve means, shaft means connecting said movable toothed member and said rotatable valve means, there being unavoidable circumferential play between said movable toothed member and said rotatable valve means, hydraulically operated means for adjustingly moving said rotatable valve means relative to said movable toothed member to compensatingly provide synchronous alignment and registration of the respective valve porting means between said movable and stationary valve means, said rotatable valve means having the form of a sleeve with end faces exposed to and acted upon by both inlet and outlet fluids respectively, said rotatable valve means having inclined slot means in fluid communication with said inlet fluid, and pin means cooperable with said slot means and being carried by said main shaft to cause said moving of said rotatable valve means relative to said movable toothed member.
Claim 3
Dependent Claim
28 words
A rotary piston machine according to claim 1 wherein said main shaft includes axially spaced stop faces, said rotatable valve means being axially displaceable between said stop faces.
Claim 4
Dependent Claim
57 words
A rotary piston machine according to claim 1 wherein said sleeve consists of three axially arranged portions with the end portions thereof being radially recessed relative to the center portion thereof, said cenTer portion having two sets of circumferentially and alternately arranged axially extending grooves with said sets having respective fluid communication with said recessed end portions.