US 3857573 A
A mounting arrangement for a fuel injector on an engine intake manifold includes a sealing ring engaged against a shoulder in a bore in the manifold. An abutment plate is mounted by a bolt or bolts on the manifold and a spring is disposed between the abutment plate and a flexible ring disposed in a groove in the injector. The flexible ring is slidably received in a further bore in the manifold said further bore being co-axial with the first-mentioned bore.
Description (OCR text may contain errors)
United States Patent 1191 Pugh .  Dec. 31, 1974 MOUNTING ARRANGEMENTS FOR INJECTORS FOR LC. ENGINE FUEL INJECTION SYSTEMS  Inventor: Michael Stephen Pugh, Birmingham,
England  Assignee: The Lucas Electrical Company Limited, Birmingham, England 22 Filed: July 30,1973 21 Appl. No.: 383,607
7  Foreign Application Priority Data July 28, I972 Great Britain 36361/72  user. ..277/102,123/139 AW  mm. Fl6j 15/06 58 1 Field of Search..... 123/139 AW; 277/102, 105,
 References Cited UNITED STATES PATENTS 2,893,365 7/1959 Haefner 123/139 AW 3,776,209 l2/l973 Wertheimer l23/l39 AW Primary Examiner-Harry N. Haroian Assistant ExaminerRobert I. Smith Attorney, Agent, or Firm-Holman & Stern 5 7 1 ABSTRACT A mounting arrangement for a fuel injector on an engine intake manifold includes a sealing ring engaged against a shoulder in a bore in the manifold, An abutment plate is mounted by a bolt or bolts on the manifold and a spring is disposed between the abutment plate and a flexible ring disposed in a groove in the injector. The flexible ring is slidably received in a further bore in the manifold said further bore being coaxial with the first-mentioned bore.
The novel mounting arrangement permits a good seal to be obtained between the injector and the manifold without the necessity of employing close tolerance machining.
5 Claims, 1 Drawing Figure MOUNTING ARRANGEMENTS FOR INJECTORS FOR LC. ENGINE FUEL INJECTION SYSTEMS This invention relates to the mounting of injectors for internal combustion engine fuel injection systems.
Conventionally, injectors are mounted with the outlet end of each injector inserted into a bore in an air intake manifold of the engine and a simple clamp on the manifold engages a flange or shoulder on the injector to hold the injector body against a seal ring fitted in this bore. It will be appreciated, however, that the effectiveness of such a mounting arrangement depends to a large extent on the machining accuracy of the bore, the clamp seat and the injector body. If the tolerance is too wide, then either the seal can be damaged by overtightening of the clamp or a good seal may not be achieved. Thus, expensive close tolerance machining is necessary.
It is an object of the invention to provide a mounting arrangement which avoids the above-mentioned disadvantage.
In accordance with the invention, a mounting arrangement for an injector on an engine intake manifold comprises a sealing ring in a bore in the manifold, an abutment mounted on the manifold and a spring acting between said abutment and the injector so as to urge the injector into sealing engagement with said sealing ring.
An example of the invention is shown in the accompanying drawing which shows an injector mounted on an engine air intake manifold, the manifold only being partly shown and being in section.
The manifoldl has a stepped bore 11 into which the outlet end of the injector 12 is inserted. This bore opens into an air inlet passage 13. A sealing ring 14 is positioned in the bore 11 and engages an internal annular shoulder 15 therein, The injector 12 has a nozzle 16 which protrudes through the sealing ring 14 and a cylindrical portion 17 which fits within the ring 14. A
shoulder 18 is formed at the end of this portion 17 remote from nozzle 16 and engages the axial end of the ring 14 opposite that engaging the shoulder 15.
The manifold 10 is formed with a flange 19 which has a bore 20 co-axial with the bore 1.1 in the manifold. A rubber or other flexible ring 21 in a groove 21a on the body of the injector is a sliding fit in this bore 20. An abutment in the form of a dished annular plate 22 with one or more lugs 23 offset from the plane of the plate 22 is mounted on the flange 19. A helical compression spring 24 surrounding the injector body is compressed between the plate 22 and an annular, steel support 25 abutting the ring 21 so as to urge the injector body towards the bore 15.
The spring 24 is so chosen that it exerts a sufficient force on the injector body to ensure that the shoulder 18 remains in good sealing contact with the seal ring 14 at all times during vibration of the manifold. During such vibration, the ring 21 serves as a shock absorber to protect the injector from damage.
1. A mounting arrangement for an injector on an engine intake manifold, said mounting arrangement comprising a sealing ring in a bore in said manifold, an abutment mounted on said manifold and a spring acting between said abutment and said injector through the intermediary of a flexible means so as to urge said injector into sealing engagement with said sealing ring.
2. The arrangement according to claim 1, wherein said flexible means is a flexible ring.
3. The arrangement according to claim 2, wherein said flexible ring is carried in a groove in said injector.
secured to said manifold.