초록 ▼

The disclosure is directed primarily to pairs of unique nutating gears which are used for restraining the rotation of the wobbler portion of the split swash-plates of both variable- and fixed-displacement hydraulic machines in which the pistons reciprocate in fixed cylinders. Each pair consists of a

The disclosure is directed primarily to pairs of unique nutating gears which are used for restraining the rotation of the wobbler portion of the split swash-plates of both variable- and fixed-displacement hydraulic machines in which the pistons reciprocate in fixed cylinders. Each pair consists of an internal gear fixed to the housing and an external gear fixed to the outer circumferential surface of the wobbler. Using any one of four different tooth designs, the gears simultaneously share two centers of meshing engagement when nutating, and they do not interfere with the complex lemniscate motion of the wobbler. This wobbler mounting arrangement results in significant size and weight reductions which are further enhanced by sliding shoe bearing assemblies that carry the axial loads developed by the machine\s reciprocating pistons. The hydraulic machine is also provided with a modular design that makes it possible to make significant changes in displacement size with minimal changes in machine structure.

대표청구항 ▼

In a hydraulic machine having: a housing, a plurality of pistons reciprocatively mounted in cylinders fixed in said housing and positioned circumferentially at a first radial distance about the rotational axis of a drive element, a split swash-plate having an inclination variable up to a predetermin

In a hydraulic machine having: a housing, a plurality of pistons reciprocatively mounted in cylinders fixed in said housing and positioned circumferentially at a first radial distance about the rotational axis of a drive element, a split swash-plate having an inclination variable up to a predetermined maximum angle relative to said rotational axis, said pistons having a stroke determined by the inclination of said swash-plate; and said swash-plate having: a wobbler which nutates about said rotational axis but does not rotate and which has a first face to which said pistons are connected at said first radial distance from said rotational axis, and an outer circumferential surface, and a rotor that is mounted on a pivot and rotated by said drive element so that, when inclined at an angle to said rotational axis, said rotor nutates when rotating; the improvement comprising: an internal gear fixed to said housing and having an axis positioned coincident with said rotational axis; an external gear fixed to said outer circumferential surface of said wobbler and having an axis aligned perpendicular to said first face of said wobbler; said internal gear and external gear having pitch circles that are each great circles on a single pitch sphere, said gears having mating teeth in mesh simultaneously at two meshing areas centered 180°apart so that said external gear is nutatable about said internal gear without rotation; and each said mating tooth, when viewed in a pitch plane of its respective gear, having a lengthwise surface with at least a central portion that is an arc of a single circle of predetermined diameter.