System for feeding fuel from a supply tank to an internal combus

Details System for feeding fuel from a supply tank to an internal combus System for feeding fuel from a supply tank to an internal combus

1995-12-21

1996-10-15

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

With fuel pump

F02M 3722, F02M 3710

Patent

active

055643965

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a system for feeding fuel from a supply tank to an internal combustion engine. In one such system, known from German Patent 37 04 191, a feed unit inserted in a supply tank and formed by an electrically driven feed pump pumps fuel from the supply tank to an engine via a supply line. To that end, the feed unit is inserted into a tubular guide part secured to the supply tank and on its lower end has an intake stub protruding into the bottom region of the tank and on its upper end has a pressure connection communicating with the supply line. To avoid damage to the feed unit from dirt particles in the fuel, the feed unit is preceded by a fuel filter mounted on the intake stub. To enable reliable avoidance of damage to the engine to be supplied as well, it is also known from the prior art in fuel feed units for internal combustion engines to provide a second fuel filter upstream of the engine in the supply line; however, this separate arrangement of the two filters has the disadvantage of relatively major construction and installation expense.
The system for feeding fuel from a supply tank to an internal combustion engine according to the invention has the advantage over the prior art that the fuel filters located upstream and downstream of the feed unit, for the sake of the most reliable possible filtering of the fuel, are received in a common filter housing, into which the feed unit is moreover simply also inserted. In this way, the entire feed system can be preinstalled outside the supply tank and is then merely inserted as a unit into the supply tank, which considerably lessens the effort and expense of installation and manufacture compared with known embodiments.
Especially advantageously, the filter housing can be embodied such that the tubular guide portion of the feed unit forms an inner first chamber in the common filter housing and is enclosed by the wall of the common filter housing in such a way as to form a second outer chamber between the guide part and the filter housing wall, into which chamber a filter is inserted. This filter, in accordance with the shape of the second chamber, is advantageously embodied as a ring filter. Another advantage from a production standpoint is attained by the one-piece embodiment of the filter housing and the guide part, with the two parts being joined together by an end wall that is also integral with them and that on one face end closes off the filter housing. This end wall has a guide bore that receives the intake stub and is partially indented inward in cup-shaped fashion; this indentation advantageously enables the reception of the disklike second filter, which thus defines an antechamber for the intake stub inside the end wall.
The pressure connections are advantageously provided on a closure cap that closes off the filter housing on the side remote from the closed end wall; by way of these pressure connections, the pressure connection of the feed unit can be joined to the ring filter and the ring filter can be joined to the supply line. It is especially advantageous for the cap to be embodied in double-walled fashion, such that the hydraulic communication between the pressure connection of the feed unit and the ring filter takes place by way of the closure cap, so that hydraulic connection lines additionally mounted to the outside of the closure cap can be dispensed with, which further reduces the production cost.
Further advantages and advantageous features of the subject of the invention may be learned from the drawing, description and claims.


BRIEF DESCRIPTION OF THE DRAWINGS

Two exemplary embodiments of the fuel feed system according to the invention are shown in the drawings and will be described in further detail below.
FIG. 1 shows a first exemplary embodiment of the feed system in a simplified section through the common filter housing, in which the hydraulic communication between the ring filter and the feed unit takes place via hydraulic lines on the closure cap, and FIG. 2 shows a second exemplary embodiment s

REFERENCES:
patent: 5036822 (1991-08-01), Kojima
patent: 5070849 (1991-12-01), Rich et al.
patent: 5146901 (1992-09-01), Jones
patent: 5170764 (1992-12-01), Tuckey
patent: 5195494 (1993-03-01), Tuckey
patent: 5330475 (1994-07-01), Woodward et al.
patent: 5392750 (1995-02-01), Laue et al.
patent: 5415146 (1995-05-01), Tuckey

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