Geared hydraulic apparatus
AssigneeSettima Meccanica S.r.l.
InventorMario Antonio Morselli
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Abstract
An improved geared hydraulic apparatus, comprising a pair of meshing gearwheels, mounted to be reciprocally rotatable in a casing between an inlet side and an outlet side for a fluid having, in use, a substantially transverse flow with respect to the axes of rotation of the gearwheels. The meshing gearwheels create, during their reciprocal rotation, progressive meshing configurations between respective co-operating teeth. In at least one of said progressive meshing configurations is defined, in at least one cross-section of the gearwheels, at least one closed area between respective fluid entrapment teeth. The closed area decreases until it is substantially cancelled out at and around at least one other, separate progressive meshing configuration between the aforesaid respective co-operating teeth.
Claims13
An improved geared hydraulic apparatus, comprising a pair of meshing gearwheels, mounted to be reciprocally rotatable in a casing between an inlet side and an outlet side for a fluid having, in use, a substantially transverse flow with respect to the axes of rotation of the gearwheels, the meshing gearwheels creating, during their reciprocal rotation, progressive meshing configurations between respective co-operating teeth, there being defined, in at least one of said progressive meshing configurations, in at least one cross-section of the gearwheels, at least one closed fluid entrapment area between respective teeth, said closed fluid entrapment area decreasing until it is substantially cancelled out at and around at least one other, separate progressive meshing configuration between the aforesaid respective co-operating teeth.
A hydraulic apparatus according to any one of the preceding claims, comprising undercuts or pockets or ducts provided on the faces of lateral abutment means or supports or bushes of the gearwheels, arranged in communication with the closed fluid entrapment areas which form in the aforesaid meshing configurations at the end cross-sections of the gearwheels, for discharging the trapped fluid towards the appropriate high or low pressure side, port or gate.
A hydraulic apparatus according to any one of the preceding claims, wherein each gearwheel comprises a number of teeth ranging between 5 and 15.
A hydraulic apparatus according to any one of the preceding claims, wherein each gearwheel has a ratio of the magnitudes of face width to pitch diameter of between 0.5 and 2.
A pair of gearwheels for use in a hydraulic apparatus according to any one of the preceding claims.
Dependencies are inferred from the claim text.