Orbital pump

Abstract

A gerotor pump includes a rotor wherein only on the face wall of the rotor that lies adjacent to a pressure kidney and a suction kidney, a lubrication surface inclined in the direction of rotation of the rotor, relative to the surface plane of the face wall of the rotor, is disposed on each tooth, in each instance, over its tooth height, either starting directly in the center tooth plane or starting “offset” ahead of the center tooth plane in the direction of rotation of the rotor, which surface is formed from a level surface or multiple, always level partial surfaces that follow one another, which enclose an angle of inclination relative to the surface plane of the face wall of the rotor, in each instance, which angle lies in the range from 0.2° to 7°, in each instance.

Description

technical field [0001] The invention relates to a gerotor pump for a rotor with a tooth tip diameter of approximately 20 to approximately 40 mm, which operates with a supply pressure in the range between 3 and 20 bar and is used to supply almost Non-lubricating media are used, for example, as oil pumps in the motor vehicle sector for supplying low-viscosity motor oils. Background technique [0002] In the prior art there are several applications for the principle and mode of operation of gerotoral pumps with an externally toothed inner wheel and an internally toothed ring (outer wheel) which is guided in such a way that the circular In the gap: so that the two gears are in meshing engagement and rotate about their own, but mutually offset axes, wherein the rotors in engagement form pressure chambers (pressure chambers) at the periphery of each other, the pressure The chamber changes cyclically in its size and its position. [0003] On both sides of these mutually meshing g...

AI Technical Summary

Problems solved by technology

[0019] Even with low-wear bearing sleeves from ceramics or hard metals, in sleeve-guided rotors, especially in combination with pump housings from castings / light metals, suction at the housing and / or at the cover Measurable wear phenomena occur in the area of ​​both sides of the groove, which with increasing operating pressure and decreasing viscosity of the medium to be fed can be attributed to the rotor at the housing and / or cover. start-up, and over time lead to increased leakage losses between the pressure and suction sides of the gerotor pump

[0020] This leads to an excessive increase in the drive torque at the same time as the efficiency loss of the pump, which, in addition to the reliability, also considerably impairs the service life of the gerotor pump described above.

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