Fluid pump, particularly a fuel supply pump
AssigneeRobert Bosch GmbH
InventorsKarl Ruhl, Ulrich Kemmner
Life of this patent
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Abstract
An electric motor-driven fluid pump, more particularly a fuel supply pump, simply and cost effectively constructed from only a few individual parts, preferably molded of a synthetic material, and preassembled as structural groups. The preferred embodiment comprises a pump of the lateral channel type having an impeller made integral with the motor armature; a tubular central housing portion which encloses the permanent magnets of the electric motor; and flange-like housing terminals on both sides of the central housing portion. The exteriors of the housing terminals are provided with pressure and suction nozzles and the interiors are provided with the stationary part of the pump and the commutator guides for the collector.
Claims12
A fluid pump, especially adaptable for supplying fuel to an automotive vehicle, including a pump system and an electric motor connected thereto in driving relationship and arranged in a common housing, said pump system, electric motor and common housing consisting of partially preassembled structural units, comprising:
- a first structural unit comprising an outer terminal housing part having an axle made integral therewith;
- a second structural rotor unit comprising a pump impeller and a motor armature mounted for rotation on said axle;
- a third structural unit comprising a central partial housing surrounding said impeller and motor armature and adjoining the first terminal housing and including permanent magnets for said electric motor;
- and
- a fourth unit comprising a second terminal housing part forming a closure for said partial housing,
- a first terminal housing forming a second closure for said partial housing,
- said first terminal housing part and said second terminal housing part being made of synthetic material by extrusion molding with outwardly projecting nozzles thereon, one being a suction nozzle and the other being a pressure nozzle,
- both said terminal housing parts having radially extending flanges forming stop means for the central partial housing and, said central partial housing further including inwardly extending flanging means for engaging said terminal housings,
- said first terminal housing part and second terminal housing part having radial inwardly extending recesses and said central partial housing being provided with inwardly extending flanges for engaging said recesses,
- said first terminal housing part being provided with a lateral channel in the form of a partial ring, an interior pressure channel, a suction opening connected with said suction nozzle for the flow of fluid from said suction nozzle into said lateral channel and into said pressure channel and ventilation means for venting gases in said fluid out of said lateral channel,
- said ventilation means comprising radially extending groove means opening into said lateral channel and a peripherally located axial slit communicating with said groove for venting gases from said lateral channel.
Dependencies are inferred from the claim text.