Motor/pump unit, especially for antislip brake systems

Abstract

The present invention relates to a motor / pump unit, especially for slip-controlled motor vehicle brake systems, including an accommodating member for hydraulically active components, an internal gear pump arranged in a bore of the accommodating member and comprising pump components such as a pinion / internal gear combination arranged between two housing parts, wherein the pump components form a pre-assembled unit, and including a motor for driving the internal gear pump. An object of the invention is to devise a motor / pump unit, which allows a space-saving and low-cost integration of an internal gear pump in an accommodating member. This object is achieved in that the housing parts can be arranged preliminarily by at least one securing element in such a fashion that the final alignment of the housing parts relative to each other takes place when the unit is inserted into the accommodating member.

Description

TECHNICAL FIELD [0001] The present invention relates to a motor / pump unit, especially for slip-controlled motor vehicle brake systems, including the features of the preamble of patent claim 1. BACKGROUND OF THE INVENTION [0002] Electronically controllable motor vehicle brake systems including a pressure-generating device configured as a piston pump for generating hydraulic pressure and a motor for this purpose are principally known in the art. A piston pump of the eccentric type necessitates at least two angularly arranged bores to accommodate a driving shaft and at least one pump piston. At least one pressure valve and one suction valve are necessary for the charge changing. This type of pump suffers from the basic and constructively induced shortcoming that inevitable and audible pressure pulsations develop during fluid delivery. The running noise is principally tolerated because the pump of conventional, slip-controlled brake systems is switched on only rarely in average driving ...

AI Technical Summary

Benefits of technology

[0005] An object of the present invention is to devise a motor / pump unit, which avoids the shortcomings of the state of the art and allows a space-saving and low-cost integration of an internal gear pump in an accommodating member.

[0008] Further, in an advantageous aspect of the invention, a first housing part is fixed on the accommodating member so as to be undisplaceable in an axial direction and a radial direction and, in addition, is used to lock the pump components in the accommodating member. Consequently, the first housing part additionally fulfils a locking function for at least one other pump component, what limits the structural effort.

[0010] For a simple assembly in an axial direction it is favorable that the pin is arranged in parallel to a pump shaft. Furthermore, for a simple design the pin includes a cylindrical portion, which extends through a bore of the stop-sided housing part, with the bore in this housing part having a larger diameter compared to the cylindrical portion, and with the diameter being smaller compared to the stop. This permits a form-locking pre-assembly of the unit without causing tension during the insertion into the accommodating member.

Problems solved by technology

Consequently, the first housing part additionally fulfils a locking function for at least one other pump component, what limits the structural effort.

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