Fuel injection valve

• US 5,516,424 A
• Filed: 08/01/1994
• Issued: 05/14/1996
• Est. Priority Date: 07/31/1993
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Strohschein, Heinrich
• Primary Examiner(s): Savage, Matthew O.
• Application Number:
  US08/283,870
• Time in Patent Office: 652 Days
• Field of Search: 210/418, 210/429, 210/445, 210/450, 210/452, 210/453, 210/460, 210/461, 210/463, 210/485, 210/495, 210/474, 210/497.01, 210/499, 210/232, 210/477, 239/575, 239/590, 239/DIG. 23, 251/129.21, 137/544, 137/550
• US Class Current: 210/232
• CPC Class Codes: B01D 29/23 arranged for outward flow filtration
• CPC Class Codes: B01D 29/96 in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters B01D29/09, B01D29/70 take precedence
• CPC Class Codes: B01D 35/02 Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks, B01D35/05 takes precedence; water pipe system filters E03B3/18, E03B7/07; dirt catchers in sewers E03F; filters or strainers for pipe-lines in general B08B, E03F; object or dirt catching devices in sinks or the like E03C1/26; suction strainers or filters for pumps F04B53/005, F04D29/70
• CPC Class Codes: F02M 51/0614 characterised by arrangement of electromagnets or fixed armature
• CPC Class Codes: F02M 51/0682 the body being hollow and its interior communicating with the fuel flow F02M51/0675 takes precedence
• CPC Class Codes: F02M 61/165 Filtering elements specially adapted in fuel inlets to injector
• CPC Class Codes: F02M 61/168 Assembling; Disassembling; Manufacturing; Adjusting
• CPC Class Codes: F16K 27/0245 with ball-shaped valve members
• CPC Class Codes: F16K 27/029 Electromagnetically actuated valves
• CPC Class Codes: F16K 31/0651 the fluid passing through the solenoid coil
• CPC Class Codes: F16K 31/0655 Lift valves
• CPC Class Codes: Y10S 239/23 Screens
• CPC Class Codes: Y10T 137/794 With means for separating solid material from the fluid

Abstract

A fuel injection valve has a fuel filter developed as one piece with a holding collar. The holding collar extends radially beyond the fuel inlet connection and has a nose outside the fuel inlet connection. The circumferential nose of the holding collar together with the groove on the outer circumference of the fuel inlet connection forms a detent connection by which the fuel filter is fastened in pin-pointed position. Between the base body of the fuel filter and the inner wall of the fuel inlet connection there is merely a clearance fit, so that formation of chips is avoided within the fuel injection valve. The fuel injection valve is particularly suitable for use in fuel injection systems of mixture-compressing external-ignition internal combustion engines.

Claims

1. A fuel injection valve, for fuel injection systems of internal combustion engines, comprising:

a fuel inlet connection, the fuel inlet connection having a cylindrical portion including a cylindrical outer surface and a cylindrical inner bore, the cylindrical portion including an open end face communicating with the bore, the cylindrical outer surface having a first annular groove proximate the end face; and

a fuel filter positioned within the bore and having a collar that is positioned adjacent the end face and extending radially outward beyond a juncture of an outer periphery of the end face and the cylindrical outer surface, the collar including an axial portion extending axially in a direction of the first annular groove, the axial portion having a nose portion extending radially inwardly into the first annular groove to form a detent connection for releasably attaching the filter to the fuel inlet connection.

2. The fuel injection valve according to claim 1, wherein the nose of the collar and the first annular groove on the fuel inlet connection extends 360°

around the cylindrical outer surface.

3. The fuel injection valve according to claim 1, wherein the filter includes a base body, the base body and the collar of the fuel filter being made of plastic, and a filter element of the fuel filter includes a polyamide element.

4. The fuel injection valve according to claim 3, wherein upon injection molding of the base body and the collar of the fuel filter, a sprue of injection molding from a manufacture of the fuel filter is arranged in a region of the fuel filter which, after the mounting of the fuel filter in the fuel inlet connection, lies outside the inner bore of the fuel inlet connection.

5. The fuel injection valve according to claim 1, wherein the axial portion of the collar is limited by an inner curvature facing toward the fuel inlet connection and by an outer curvature facing away from the fuel inlet connection.

6. The fuel injection valve according to claim 1, wherein the collar includes at least one groove extending radially and axially therethrough, the groove intersecting the nose so that the nose has at least one gap therein and extends less than 360°

around the cylindrical outer surface.

7. The fuel injection valve according to claim 1, wherein a portion of the collar which extends radially outward beyond said juncture at least partially delimits a second annular groove formed by the cylindrical outer surface of the fuel inlet connection for a sealing ring.

8. The fuel injection valve according to claim 1, wherein the filter includes a base body, the base body being positioned within the bore of the fuel inlet connection, a clearance fit being provided between the base body and an inner surface of the bore.