• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a ramp (1) for motor vehicle fuel, comprising a ramp body (2) elongate along a longitudinal axis XX 'and having at least one open end (3), at least one inlet (4). ) of fuel and at least one outlet (5) of fuel, characterized in that said ramp (1) of fuel comprises at least one membrane (6) flexible and deformable under the effect of a fuel pressure, said membrane being fixed to the ramp body (2) so as to close the open end (3).
    公开号:FR3043732A1
    申请号:FR1560883
    申请日:2015-11-13
    公开日:2017-05-19
    发明作者:Joseph Lefebvre
    申请人:Renault SAS；
    IPC主号:
    专利说明:

    The invention relates to the field of automobiles, in particular vehicles with an internal combustion engine. More particularly, the invention relates to a fuel rail, particularly of plastic or metal, for a vehicle engine, in particular a spark ignition engine.
    A fuel ramp has the role of distributing the fuel to several injectors of an engine. To perform this function, the fuel is under pressure inside this fuel rail.
    During this distribution of fuel under pressure by the fuel rail, pulsations are generated by the pressure variations due to successive openings and closures of the injectors.
    Such pulsations must be attenuated to ensure proper engine operation. Nevertheless, the existing systems that allow pulsation attenuation are unsatisfactory.
    Indeed, many systems damping the known fuel ramp pulsations comprise one or more deformable elements inside or outside the fuel rail, or on the fuel circuit located upstream of the fuel rail. .
    It is also known from the state of the art the use of a fuel pressure regulator controlled by a set pressure, associated or not with a fuel return circuit to the tank.
    Such known systems have the disadvantage of being bulky, heavy, complicated and uneconomical.
    It is therefore necessary to develop new solutions to overcome the defects of these systems known in the state of the art.
    In this context, the objective of the invention is to propose a solution for reducing the pressure pulsations of the fuel rail, which is efficient, simple and inexpensive. For this purpose, the invention relates to a motor vehicle fuel rail, comprising a ramp body elongate along a longitudinal axis XX 'and having at least one open end, at least one fuel inlet and at least one outlet fuel, said fuel rail comprises at least one flexible membrane and deformable under the effect of a fuel pressure, and attached to the ramp body so as to close said open end.
    Thus, the fuel rail according to the invention comprises one or more end (es) open (es), each being closed by a flexible membrane and deformable under the fuel pressure. This (these) membrane (s) deforms (s) outwardly when the pressure in the fuel rail varies, in particular under the effect of successive openings of the injectors, which effectively reduces the pulsations generated. by these variations of the fuel pressure inside the body of the ramp.
    This solution is also simple because it does not require the use of complicated means to reduce the pulsations generated by the openings and closures of the injectors. Indeed, this system requires only a limited number of parts.
    In the same way this simple solution is not expensive since it does not require a lot of modifications of the fuel rail and assembly processes are known and controlled.
    This system is also compact and lightweight which is also an advantage.
    In addition, it is possible to adapt the thickness and the material of the membrane to the need for the application of the engine, without having to redesign the entire fuel rail, which is also advantageous.
    According to an embodiment of the invention, a protective cap also closes the open end, said plug is positioned on the ramp body at said open end so that the flexible membrane is positioned between said plug and a portion inside the fuel rail. The presence of such a plug protects the membrane against external aggression and against shocks.
    According to one embodiment of the invention, said stopper cooperates with the ramp body at the open end so as to fix the flexible membrane to said ramp body. This way of attaching the membrane to the ramp body has the advantage of not requiring gluing or welding the membrane. This therefore allows a faster installation of the membrane and consequently a time saving and a reduction in the manufacturing cost of the fuel rail.
    According to one embodiment of the invention, the membrane has substantially a disc shape having substantially the same diameter as a collar of the ramp body at the open end. According to the same embodiment, a longitudinal section of said protective cap comprises a peripheral portion having substantially a bracket shape for locking and a convex central portion, said central portion being separated from the membrane by a free space, and when the peripheral portion is attached to the flange, said peripheral portion exerts on an outer portion of the membrane a force parallel to the axis XX '.
    By outer portion of the membrane is meant a peripheral band substantially circumferentially of said disk-shaped membrane.
    According to one embodiment of the invention, the outer portion of the membrane is thicker than the rest of said membrane. This extra thickness of the outer portion of the membrane allows a tight attachment of the membrane against the collar of the ramp body, without the force exerted by the protective cap is too high.
    According to one embodiment of the invention, the plug has substantially the shape of a cup having a peripheral portion thicker than a central portion of said cup, and the membrane has an outer portion which extends beyond a flange of the ramp body at the open end. According to this embodiment, when the cap is attached to the collar by its peripheral portion, said peripheral portion exerts on the outer portion of the membrane a force perpendicular to the axis XX ', the central portion of the cap being separated from the membrane by a free space.
    In this case, the membrane may have a shape other than a disk shape, the outer portion of the membrane being the portion of the membrane exceeding the diameter of the open end of the ramp.
    According to one embodiment of the invention, the collar is chamfered.
    According to one embodiment of the invention, the protective cap comprises at least one opening. This (these) opening (s) allows (ent) to return the free space to atmospheric pressure. In this way, the membrane has more freedom of movement to absorb the pulsation waves. As a result, the efficiency of attenuation of the pulsations by the membrane is increased.
    According to one embodiment of the invention, the protective cap comprises a set of openings separated by connecting radii.
    According to one embodiment of the invention, the flexible membrane is made of rubber or silicone. The invention also relates to a motor of a vehicle, said engine comprises a fuel rail according to the invention and as described above. Other features and advantages will appear more clearly on reading the following description, of preferred embodiments, given by way of non-limiting example, with reference to the appended drawings, in which: FIG. section of a fuel rail according to the invention; Figure 2a is a partial view of the fuel rail shown in Figure 1, showing the membrane and the protective cap according to the first embodiment; Figure 2b is a side view of the protective cap of Figure 2a; Figure 3a is a partial view of a fuel rail according to a second embodiment of the invention, comprising a membrane and a cup-shaped protective cap; Figure 3b is a side view of the protective cap of Figure 3a.
    A sectional view of a fuel rail 1 according to the invention is shown in Figure 1. The fuel rail 1 comprises a ramp body 2 elongate in a direction XX 'and having a generally tubular shape. The ramp body 2 has an open end 3 and a flange 21 at this open end 3.
    The ramp body 2 also comprises along its wall an opening 4 constituting a fuel inlet and four openings 5 opposite to the fuel inlet 4, these four openings 5 each opening into an injector of an engine comprising the ramp of fuel 1. The position and the number of openings 4, 5 can obviously be modified in various ways.
    In known manner, when the engine is running, the fuel enters the fuel rail 1 through the fuel inlet 4 with a certain pressure. The fuel contained inside the fuel rail 1 is then directed towards the injectors via the openings 5. For this purpose, the injectors open and close successively.
    To reduce the pressure pulsations that may be generated by these successive openings of the injectors, the open end 3 is closed by a flexible membrane 6 as shown in Figure 1 and Figure 2a.
    Such a membrane 6 may be fixed by gluing, welding or by any other fastening means allowing this membrane to close the open end 3 of the ramp 1 of fuel sealingly.
    The membrane 6 is substantially disk-shaped and has a diameter equivalent to the diameter of the collar 21 of the ramp body 2.
    In the embodiment of Figure 2a, a protective cap 7, also closes the open end 3 so that the membrane 6 is positioned between this plug and the inside 11 of the fuel rail 1. In this way the cap 7 protects the flexible membrane 6 against aggression and against shocks.
    The plug 7 also serves to fix the membrane 6 against the ramp body 2. For this purpose, the plug 7 has a peripheral portion 71 whose longitudinal section is substantially square. This peripheral portion 71 cooperates with the flange 21 of the ramp body 2 so as to exert a force F1 parallel to the axis XX 'on the outer portion 60 of the membrane 6 against the flange 21, as shown by the arrows.
    The central portion 72 of the cap 7 is convex and separated from the membrane 6 by a free space 8. This free space 8 allows the membrane to inflate and deflate to absorb the pulsations due to pressure variations.
    According to one embodiment of the invention, the thickness of the outer portion 60 of the membrane is higher than the central portion 61 of said membrane 6. This ensures a good fixing and a good seal. In addition, the central portion 61 remains thin to facilitate the swelling of the membrane and thus absorb even the small pressure variations.
    Advantageously, the stopper 7 comprises one or more openings 73. These openings make it possible to put the free space 8 at atmospheric pressure. In this way the membrane can inflate outwardly without any effect on the interior 11 of the fuel rail 1. Thus, the attenuation of the pulsation waves is more effective.
    FIG. 2b shows an illustrative example of the type of openings that can be counted on the plug 7. In this example, the holes 73 are separated by connecting radii 74.
    Figure 3a partially shows a second embodiment of the fuel rail according to the invention. In this embodiment, the membrane 600 has a diameter greater than the diameter of the open end 300, so that when it is in place said membrane 600 covers a portion of the outer wall 220 of the ramp body 200 at the open end 3 and goes beyond the collar 210.
    The cap 700 has a cup shape whose peripheral portion 710 is thicker than the central portion 720. This plug 700 is fixed by its peripheral portion 710 to the collar 210 of the ramp body 200 located at the open end 3 .
    According to the example of Figure 3a, said flange 210 is chamfered.
    By attaching to said flange 210, said peripheral portion 710 exerts on the outer portion 610 of the membrane 600 a force F2 perpendicular to the axis XX 'as shown by the arrows.
    In the same manner as for the exemplary embodiment shown in FIG. 2a, in the embodiment of FIG. 3a, the central portion 720 of the plug 700 is separated from the membrane 600 by a free space 800. In the same way also , that the example of Figure 2b, the cap 700 may include one or more openings 730. Advantageously the openings 730 are separated by connecting radii 740.
    The other characteristics of the fuel ramp shown in FIG. 3a are identical to those of the fuel ramp shown in FIG. 2a.
    According to one embodiment of the invention, each connecting radius 74; 740 is greater than twice the thickness of the membrane 6; 600, in particular in the central portion 61 if the outer portion 60 is thicker.
    The membrane can be made from any type of flexible and strong material, for example Silicone or rubber.
    Advantageously the plug 7; 700 is of the same material as the ramp body 1.
    According to an alternative embodiment, the membrane is integral with the protective cap 7; 700.
    Advantageously, the thickness of the membrane 6; 600 is adapted to the type of engine.
    Also advantageously, to protect the membrane, the elements coming into contact with the membrane 6; 600, have rounded shapes, devoid of cutting plane, burrs and extractor shape.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Ramp (1) of motor vehicle fuel, comprising a ramp body (2; 200) elongate along a longitudinal axis XX 'and having at least one open end (3; 300), at least one inlet ( 4) of fuel and at least one outlet (5) of fuel, characterized in that said ramp (1) of fuel comprises at least one membrane (6; 600) flexible and deformable under the effect of a fuel pressure, said membrane being attached to the ramp body (2; 200) so as to close the open end (3; 300).
    [2" id="c-fr-0002]
    2. Ramp (1) of fuel according to claim 1, characterized in that a plug (7; 700) of protection also closes the open end (3; 300), said plug (7; 700) is positioned on the ramp body (2) at said open end (3; 300) so that the flexible membrane (6; 600) is positioned between said plug (7; 700) and an inner portion (11; 110) of the fuel rail (1).
    [3" id="c-fr-0003]
    3. Ramp (1) of fuel according to claim 2, characterized in that said plug (7; 700) cooperates with the ramp body (2; 200) at the open end (3; 300) so as to attaching the flexible membrane (6; 600) to said ramp body (2; 200).
    [4" id="c-fr-0004]
    4. Ramp (1) fuel according to one of claims 2 or 3, characterized in that the membrane (6) has substantially a disk-like shape having substantially the same diameter as a collar (21) of the ramp body ( 2) at the open end (3), in that a longitudinal section of said plug (7) comprises a peripheral portion (71) having substantially a square shape and a central portion (72) convex, said parie central being separated from the membrane by a free space (8), and in that when the peripheral portion (71) is fixed to the flange (21), said peripheral portion (71) exerts on an outer portion (60) of the membrane (6) a force parallel to the axis XX '.
    [5" id="c-fr-0005]
    5. Ramp (1) fuel according to claim 4, characterized in that the outer portion (60) of the membrane (6) is thicker than a central portion (61) of said membrane (6).
    [6" id="c-fr-0006]
    6. fuel rail according to one of claims 2 or 3, characterized in that the plug (700) has substantially the shape of a cup having a peripheral portion (710) thicker than a central portion (720) of said cup, in that the membrane (600) has an outer portion (610) extending beyond a flange (210) of the ramp body (200) at the open end (3), and in that when the plug (700) is attached to the collar (210) by its peripheral portion (710), said peripheral portion (710) exerts on the outer portion (610) of the membrane (600) a force (F2 ) perpendicular to the axis XX ', the central portion (720) of the plug (700) being separated from the membrane by a free space (800).
    [7" id="c-fr-0007]
    7. Ramp (1) fuel according to one of claims 2 to 6, characterized in that the plug (7; 700) comprises at least one opening (73; 730).
    [8" id="c-fr-0008]
    8. Ramp (1) fuel according to one of claims 2 to 7, characterized in that the protective cap (7; 700) comprises a set of openings (73; 730) separated by radii (74; 740). ) connection.
    [9" id="c-fr-0009]
    9. Ramp (1) fuel according to one of the preceding claims, characterized in that the flexible membrane (6; 600) is made of rubber or silicone.
    [10" id="c-fr-0010]
    10. Engine of a vehicle, characterized in that said engine comprises a fuel rail (1) according to one of the preceding claims.
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3043732B1|2019-06-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0235394A1|1986-03-05|1987-09-09|WALBRO CORPORATION |Fuel rail for internal combustion engines|
    WO2000011344A1|1998-08-18|2000-03-02|Delphi Technologies, Inc.|Fuel injection system|
    DE102004019787A1|2004-04-23|2005-11-17|Winkelmann Palsis Motortechnik Gmbh & Co.Kg|Fuel distributor e.g. for combustion engines, has distributor line with pump-lateral inlet and pipe fixings for allowing injecting mechanisms to be fitted with end of distributor line|
    DE202014003535U1|2014-04-25|2015-07-30|GM Global Technology Operations LLC |Fuel rail for an internal combustion engine|EP3438444A1|2017-08-02|2019-02-06|Robert Bosch GmbH|Distributor device for a water injection device of a combustion engine|
    EP3617492A1|2018-08-31|2020-03-04|Continental Automotive GmbH|A fuel rail for a fuel injection system for an internal combustion engine and a method for manufacturing a fuel rail|
    EP3633181A1|2018-10-02|2020-04-08|Continental Automotive GmbH|End plug for a fuel rail, fuel rail and method of fabricating a fuel rail for an internal combustion engine|
    法律状态:
    2016-11-18| PLFP| Fee payment|Year of fee payment: 2 |
    2017-05-19| PLSC| Publication of the preliminary search report|Effective date: 20170519 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-22| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1560883A|FR3043732B1|2015-11-13|2015-11-13|FUEL RAMP WITH PULSATION DAMPING|
    FR1560883|2015-11-13|FR1560883A| FR3043732B1|2015-11-13|2015-11-13|FUEL RAMP WITH PULSATION DAMPING|
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