EP0399402A1 - Pressure regulator for regulating the pressure inside the fuel supply manifold of an internal combustion engine fuel supply device - Google Patents
Pressure regulator for regulating the pressure inside the fuel supply manifold of an internal combustion engine fuel supply device Download PDFInfo
- Publication number
- EP0399402A1 EP0399402A1 EP90109460A EP90109460A EP0399402A1 EP 0399402 A1 EP0399402 A1 EP 0399402A1 EP 90109460 A EP90109460 A EP 90109460A EP 90109460 A EP90109460 A EP 90109460A EP 0399402 A1 EP0399402 A1 EP 0399402A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pressure regulator
- outlet hole
- fact
- manifold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/54—Arrangement of fuel pressure regulators
Definitions
- the present invention relates to a pressure regulator for regulating the fuel pressure inside a supply manifold forming part of an internal combustion engine fuel supply device.
- Known regulators of the aforementioned type substantially comprise a cup-shaped body having a side and bottom wall, and defining a fuel chamber communicating with a fuel inlet and outlet hole.
- the outlet hole is controlled by a plunger connected to a deformable diaphragm forming a wall inside the fuel chamber and which is subjected to the action of a spring designed to normally maintain the plunger against a corresponding seat and so close the outlet hole.
- the fuel inlet hole is usually formed inside a fitting secured to the side wall of the body, or inside the bottom wall of the body.
- the outlet hole is usually formed inside a fitting projecting from the bottom wall of the body and usually forming part of a coupling in which a seat is also formed for the plunger.
- the regulator presents a fairly complex structure.
- the aim of the present invention is to provide a pressure regulator of the aforementioned type, designed to overcome the above drawbacks typically associated with known regulators.
- a pressure regulator for regulating the fuel pressure inside a fuel supply manifold forming part of an internal combustion engine fuel supply device, said device comprising a cup-shaped body consisting substantially of a side wall and a bottom wall, and defining a fuel chamber communicating with a fuel inlet hole and a with fuel outlet hole controlled by a plunger connected to a deformable diaphragm forming a wall of said chamber and subjected to the action of a spring designed to normally maintain said plunger against a corresponding seat and so close said outlet hole; characterised by the fact that said fuel inlet hole communicates with an inlet fitting projecting from said bottom wall of said body and connectable in fluidtight manner inside a seat on said manifold, and by the fact that said fuel outlet hole communicates with an outlet fitting projecting from the lateral surface of said body and having its axis perpendicular to the longitudinal axis of said body.
- the pressure regulator substantially comprises a cup-shaped body 1 having a side wall 2 and a bottom wall 3 defining a fuel chamber 4 communicating with a fuel inlet hole 5 and a fuel outlet hole 6.
- Said outlet hole 6 is controlled by a plunger 7 connected to a deformable diaphragm 8 forming one wall of chamber 4 and subjected to the action of a spring 9 designed to normallu maintain plunger 7 against a corresponding seat 10 and so close outlet hole 6.
- Inlet hole 5 communicates with an inlet fitting 12 projecting from bottom wall 3 and connectable in fluidtight manner inside a seat 13 on a manifold 14 forming part of the supply device.
- Outlet hole 6 communicates with an outlet fitting 15 projecting from the lateral surface 16 of body 1 and having its axis substantially perpendicular to the longitudinal axis of body 1.
- Outlet hole 6 comprises a first hole portion 6a having its axis parallel to said longitudinal axis, and a second portion 6b perpendicular to said first portion 6a and formed inside outlet fitting 15.
- Said first portion 6a houses a coupling 17, one end of which presents seat 10 for plunger 7.
- Inlet hole 5 comprises at least a first portion 5a formed inside inlet fitting 12, and a second portion 5b formed inside bottom wall 3.
- Inlet fitting 12 presents an annular groove 18 housing a seal 19 for sealing seat 13 on manifold 14, as shown clearly in Fig.1.
- Body 1 is formed, e.g. die-cast, in one piece with inlet and outlet fittings 12 and 15, or may be formed from a drawn sheet metal element, in which case, fitting 15 may be welded in a radial hole on the body, and coupling 17 secured to the inside end.
- the pressure regulator according to the present invention also comprises a cover 22, the edge of which is turned about a corresponding edge 21 of body 1, as shown clearly in Fig.1.
- cover 22 also acts a support for one end of spring 9, the other end of which conveniently rests, in known manner, on a ring 23 connected to a disc 24 in turn resting on plunger 7.
- the pressure regulator described above is designed to maintain the fuel pressure inside manifold 14 substantially constant: the fuel in manifold 14 communicates with chamber 4 on the regulator via hole 5; when the pressure inside chamber 4 exceeds a predetermined value, the force exerted on deformable diaphragm 8 overcomes the elastic reaction of spring 9, thus detaching plunger 7 from seat 10, enabling communication between chamber 4 and outlet hole 6, and draining off sufficient fuel for restoring the pressure inside chamber 4 to the required value.
- the pressure regulator described above may be fitted to a highly straightforward manifold 14 substantially comprising a single central duct with a substantially cup-shaped end housing 25.
- a slot 26 in the side wall of the housing as shown clearly in Fig.1.
- the regulator is connectable to the manifold in exactly the same way as already described.
- the regulator according to the present invention provides for accurately regulating the pressure inside manifold 14 by virtue of the rapid response afforded by the pressure inside the manifold being transmitted with practically no load loss to chamber 4 on the regulator. This is due to the design, arrangement and size of fuel inlet holes 5, which, in addition to being arranged substantially axially, may present a large diameter occupying substantially the entire section of inlet fitting 12 and most of the section of bottom wall 3 of body 1.
- the design of the regulator is extremely straightforward, by virtue of consisting of a small number of easy-to-make components.
- Body 1 in particular, may be formed in one piece using any appropriate technique enabling low-cost production.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
Description
- The present invention relates to a pressure regulator for regulating the fuel pressure inside a supply manifold forming part of an internal combustion engine fuel supply device.
- Known regulators of the aforementioned type substantially comprise a cup-shaped body having a side and bottom wall, and defining a fuel chamber communicating with a fuel inlet and outlet hole. The outlet hole is controlled by a plunger connected to a deformable diaphragm forming a wall inside the fuel chamber and which is subjected to the action of a spring designed to normally maintain the plunger against a corresponding seat and so close the outlet hole. The fuel inlet hole is usually formed inside a fitting secured to the side wall of the body, or inside the bottom wall of the body. The outlet hole is usually formed inside a fitting projecting from the bottom wall of the body and usually forming part of a coupling in which a seat is also formed for the plunger.
- Known pressure regulators of the type briefly described above present numerous drawbacks.
- First of all, for connecting the regulator to the fuel supply circuit of the supply device, certain parts of the device must be specially designed, or provision made for appropriate pipe sections and fittings. If, in fact, the fuel inlet hole on the pressure regulator is formed inside a fitting projecting from the side wall of the regulator body, provision must be made for a duct to connect the fitting to a corresponding fitting on the fuel manifold. If, on the other hand, the fuel inlet hole is formed in the bottom wall of the regulator body, and the outlet hole inside a fitting projecting from the same wall, the fuel manifold must be designed so as to present two separate internal ducts, one for supply and the other for drainage. Moreover, regulators of the aforementioned type fail to provide for accurate pressure regulation, mainly on account of the flow resistance encountered by the fuel through the various holes and ducts formed inside the regulator.
- What is more, in some cases, the regulator presents a fairly complex structure.
- The aim of the present invention is to provide a pressure regulator of the aforementioned type, designed to overcome the above drawbacks typically associated with known regulators.
- With this aim in view, according to the present invention, there is provided a pressure regulator for regulating the fuel pressure inside a fuel supply manifold forming part of an internal combustion engine fuel supply device, said device comprising a cup-shaped body consisting substantially of a side wall and a bottom wall, and defining a fuel chamber communicating with a fuel inlet hole and a with fuel outlet hole controlled by a plunger connected to a deformable diaphragm forming a wall of said chamber and subjected to the action of a spring designed to normally maintain said plunger against a corresponding seat and so close said outlet hole; characterised by the fact that said fuel inlet hole communicates with an inlet fitting projecting from said bottom wall of said body and connectable in fluidtight manner inside a seat on said manifold, and by the fact that said fuel outlet hole communicates with an outlet fitting projecting from the lateral surface of said body and having its axis perpendicular to the longitudinal axis of said body. One embodiment of the pressure regulator according to the present invention will be described by way of example with reference to the accompanying drawings, in which:
- Fig.1 shows a longitudinal section of the regulator according to the present invention, connected to the fuel manifold forming part of the supply device;
- Fig.2 shows a partially-sectioned side view of the Fig.1 regulator mounted on a different type of fuel manifold.
- The pressure regulator according to the present invention substantially comprises a cup-shaped body 1 having a
side wall 2 and abottom wall 3 defining a fuel chamber 4 communicating with afuel inlet hole 5 and afuel outlet hole 6. Saidoutlet hole 6 is controlled by a plunger 7 connected to adeformable diaphragm 8 forming one wall of chamber 4 and subjected to the action of a spring 9 designed to normallu maintain plunger 7 against acorresponding seat 10 and soclose outlet hole 6. -
Inlet hole 5 communicates with an inlet fitting 12 projecting frombottom wall 3 and connectable in fluidtight manner inside aseat 13 on amanifold 14 forming part of the supply device.Outlet hole 6 communicates with an outlet fitting 15 projecting from thelateral surface 16 of body 1 and having its axis substantially perpendicular to the longitudinal axis of body 1. -
Outlet hole 6 comprises afirst hole portion 6a having its axis parallel to said longitudinal axis, and asecond portion 6b perpendicular to saidfirst portion 6a and formed inside outlet fitting 15. - Said
first portion 6a houses acoupling 17, one end of which presentsseat 10 for plunger 7. -
Inlet hole 5 comprises at least afirst portion 5a formed inside inlet fitting 12, and asecond portion 5b formed insidebottom wall 3. -
Inlet fitting 12 presents anannular groove 18 housing aseal 19 for sealingseat 13 onmanifold 14, as shown clearly in Fig.1. - Body 1 is formed, e.g. die-cast, in one piece with inlet and
outlet fittings coupling 17 secured to the inside end. - The pressure regulator according to the present invention also comprises a
cover 22, the edge of which is turned about acorresponding edge 21 of body 1, as shown clearly in Fig.1. In addition to locking the edge ofdeformable diaphragm 8,cover 22 also acts a support for one end of spring 9, the other end of which conveniently rests, in known manner, on aring 23 connected to adisc 24 in turn resting on plunger 7. - The pressure regulator described above is designed to maintain the fuel pressure inside
manifold 14 substantially constant: the fuel inmanifold 14 communicates with chamber 4 on the regulator viahole 5; when the pressure inside chamber 4 exceeds a predetermined value, the force exerted ondeformable diaphragm 8 overcomes the elastic reaction of spring 9, thus detaching plunger 7 fromseat 10, enabling communication between chamber 4 andoutlet hole 6, and draining off sufficient fuel for restoring the pressure inside chamber 4 to the required value. - The pressure regulator described above may be fitted to a highly
straightforward manifold 14 substantially comprising a single central duct with a substantially cup-shaped end housing 25. To fit the regulator insidehousing 25, provision need simply be made for aslot 26 in the side wall of the housing, as shown clearly in Fig.1. - In the case of a
manifold 14 designed as shown in Fig.2 and featuring aregulator housing 27 arranged radially in relation to the longitudinal axis of the manifold (as opposed to axially as in Fig.1), the regulator is connectable to the manifold in exactly the same way as already described. - The regulator according to the present invention provides for accurately regulating the pressure inside
manifold 14 by virtue of the rapid response afforded by the pressure inside the manifold being transmitted with practically no load loss to chamber 4 on the regulator. This is due to the design, arrangement and size offuel inlet holes 5, which, in addition to being arranged substantially axially, may present a large diameter occupying substantially the entire section of inlet fitting 12 and most of the section ofbottom wall 3 of body 1. - The design of the regulator is extremely straightforward, by virtue of consisting of a small number of easy-to-make components. Body 1, in particular, may be formed in one piece using any appropriate technique enabling low-cost production.
- To those skilled in the art it will be clear that changes may be made to both the design and arrangement of the component parts of the embodiment described and illustrated herein without, however, departing from the scope of the present invention.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT5313089U IT217084Z2 (en) | 1989-05-26 | 1989-05-26 | PRESSURE REGULATOR FOR PRESSURE ADJUSTMENT INSIDE A FUEL SUPPLY MANIFOLD OF A FUEL SUPPLY DEVICE OF AN INTERNAL COMBUSTION ENGINE |
IT5313089U | 1989-05-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0399402A1 true EP0399402A1 (en) | 1990-11-28 |
EP0399402B1 EP0399402B1 (en) | 1993-07-28 |
Family
ID=11280193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900109460 Expired - Lifetime EP0399402B1 (en) | 1989-05-26 | 1990-05-18 | Pressure regulator for regulating the pressure inside the fuel supply manifold of an internal combustion engine fuel supply device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0399402B1 (en) |
BR (1) | BR9002399A (en) |
DE (1) | DE69002390T2 (en) |
ES (1) | ES2052096T3 (en) |
IT (1) | IT217084Z2 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0116742A1 (en) * | 1982-09-29 | 1984-08-29 | General Motors Corporation | Fuel rail assembly and method of fabrication |
US4570601A (en) * | 1983-11-15 | 1986-02-18 | Nippondenso Co., Ltd. | Fuel delivery pipe |
DE3505625A1 (en) * | 1985-02-19 | 1986-08-21 | Robert Bosch Gmbh, 7000 Stuttgart | PRESSURE CONTROL DEVICE |
EP0233697A1 (en) * | 1986-02-12 | 1987-08-26 | General Motors Corporation | Self-contained fuel pressure regulator |
GB2197685A (en) * | 1986-11-18 | 1988-05-25 | Weber Srl | I.c. engine fuel injection fuel manifold unit with integrated pressure regulator |
-
1989
- 1989-05-26 IT IT5313089U patent/IT217084Z2/en active
-
1990
- 1990-05-18 DE DE1990602390 patent/DE69002390T2/en not_active Expired - Fee Related
- 1990-05-18 ES ES90109460T patent/ES2052096T3/en not_active Expired - Lifetime
- 1990-05-18 EP EP19900109460 patent/EP0399402B1/en not_active Expired - Lifetime
- 1990-05-22 BR BR9002399A patent/BR9002399A/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0116742A1 (en) * | 1982-09-29 | 1984-08-29 | General Motors Corporation | Fuel rail assembly and method of fabrication |
US4570601A (en) * | 1983-11-15 | 1986-02-18 | Nippondenso Co., Ltd. | Fuel delivery pipe |
DE3505625A1 (en) * | 1985-02-19 | 1986-08-21 | Robert Bosch Gmbh, 7000 Stuttgart | PRESSURE CONTROL DEVICE |
EP0233697A1 (en) * | 1986-02-12 | 1987-08-26 | General Motors Corporation | Self-contained fuel pressure regulator |
GB2197685A (en) * | 1986-11-18 | 1988-05-25 | Weber Srl | I.c. engine fuel injection fuel manifold unit with integrated pressure regulator |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 60 (M-796)(3408) 10 February 1989, & JP-A-63 263266 (AISAN) 31 October 1988, * |
Also Published As
Publication number | Publication date |
---|---|
DE69002390D1 (en) | 1993-09-02 |
IT217084Z2 (en) | 1991-10-29 |
ES2052096T3 (en) | 1994-07-01 |
BR9002399A (en) | 1991-08-06 |
IT8953130V0 (en) | 1989-05-26 |
EP0399402B1 (en) | 1993-07-28 |
DE69002390T2 (en) | 1993-11-18 |
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