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
  • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
  • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
  • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
• • 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
  • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
  • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

• the present invention relates to injection valves used for spraying fuel to the combustion chamber in internal combustion engines and particularly relates to injection valve regarding to the prior art part of claim 1.
• Said injection valves essentially comprise a valve body and a valve piston which functions as a piston inside said body.
• the injection valves essentially transfer high pressured fuel to the combustion chamber, existing in the engine, in a controlled manner.
• the valve piston is placed into a valve piece which is placed into the injection valve body and which separates the high-pressure regions and low-pressure regions from each other.
• the valve piece has the opening and control volume which will transfer the fuel through the high pressure valve to the piston in a controlled manner. Since the valve member, which is placed into the injection valve body, separates different pressure regions from each other, it requires a high resistance sealing member. This sealing member increases the lifetime of the injection valve.
• a sealing gasket is improved in order to provide sealing between the valve piece and the valve piston region. The presence of a single sealing member is not sufficient for increasing the lifetime of the injection valve. Therefore, another gasket is considered which will support the sealing member and the support gasket is improved.
• These members prevent the fuel, which exists in the high pressure valve between the valve piece and injection valve body, from leaking to the valve region.
• These sealing members are essentially disclosed in the patent application DE 100 20 870 Al.
• the purpose of these two gaskets is to lengthen the lifetime of the injection valve. Since said gaskets have axial fixation problems, in the patent application US 2007/0209640 Al, an improvement is realized. In the improvement realized, changes are realized in the shapes of the sealing gasket and in the support gasket, and an improvement is realized for fixing the axial positions thereof.
• the sealing gasket and the support gasket existing in the region remaining between the valve piece and the injection valve body, can not realize the function thereof in an exact manner after certain working hours as a result of the abrasion formed because of axial movement, high pressure and other mechanical effects. Therefore, in all of the injection valve systems where the gaskets exist, leakage ratios are permitted within certain tolerances. However, as mentioned above, as the working hours increase, leakage increases and the tolerance values of leakage are exceeded. As a result of exceeding the tolerance limits, the system can not realize the spraying function. However, since the gaskets are fixed to the injection valve during assembly, they lead to an increase in cost. All of the pieces inside movable injection valve as long as the engine functions are pieces which are prone to failures. Therefore, realizing production with minimum error and failure expectation has a positive affect on the injection valve and this increases the working life of the injector. As a result, because of the abovementioned problems, an improvement is required in the related technical field.
• the present invention relates to an injection valve where sealing is provided between the valve piece and the injection valve body by means of formal embodiments and which is used for spraying fuel to the combustion chamber in internal combustion engines, in order to eliminate the abovementioned problems and to bring new advantages to the related technical field.
• the main object of the present invention is to provide a fuel injection valve where the sealing between the valve piece and the injection valve body is provided without a gasket.
• the present invention relates to an injection valve for internal combustion engines, comprising an input region wherein fuel enters to the injection valve; a needle region where the fuel is sprayed into the combustion chamber; a valve channel for carrying the fuel between said input region and said needle region; a high pressure region provided on the valve channel; a low pressure region provided at the continuation of said high pressure region; a valve piece and a sealing region between said high and low pressure regions.
• Said injection valve is characterized in that said valve piece comprises a lower part which extends in the region corresponding to the low pressure region; a middle part which extends at the continuation of said lower part and along the high pressure region and which has a wider diameter than the lower part; and a chamfer part which is provided at the first sealing region where the lower part and the middle part join; and said body comprises another chamfer part which is provided thereon so as to correspond to said chamfer part.
• a squashed washer so as to provide a second sealing region between the valve piece and the body, in the region where the upper part of the valve piece is seated to the seating surface defined on the body.
• an injection valve (10) which sprays fuel to the combustion chamber in internal combustion engines; and where the sealing between the valve piece and the injection valve body is provided without the need for an additional piece and using figurative precautions.
• the injection valve (10) generally comprises two parts on a single body (11). These parts are defined as the needle region (13) and the input region (12).
• the input region (12) is defined as the region where the fuel, applied by different pieces of the vehicle, enters into the injection valve (10).
• the needle region (13) is defined as the region where the fuel inside the injection valve (10) is sprayed to the combustion chamber in a controlled manner.
• the needle (not illustrated in the figure) and the members helping the needle (not illustrated in the figure) are in connection with the needle region (13).
• the channels are embodied on the body (11) for providing the conduction of fuel between the needle region (13) and the input region (12).
• the channels are positioned where one of them exists at the center of the body in a cross section manner and where the other one is positioned at the vicinity of the body edge.
• the channel at the body (11) center is defined as 35 the valve channel (19).
• the valve channel (19) is embodied by being widened at the part thereof which is adjacent to the input region (12) and this region is defined as the high pressure region (17). During this widening process, chamfer (18) is formed on the comers formed.
• valve channel (19) In the high pressure region (16) the valve channel (19) whose diameter advances in a fixed manner, widens in a sharp manner at the vicinity of the region where fuel, coming from the filter, enters into the high pressure region (16).
• the valve piston (30) is in connection into the valve channel (19).
• the valve piston (30) exists between the input region (12) and the needle region (13) in the valve channel (19).
• the valve piece (20) is in connection at the vicinity of the high pressure region (16) on the valve channel (19).
• the valve piece (20) is embodied in a cylindrical manner and the piece is defined as a cylinder with three different widths.
• the part, which is closest to the needle region (13), is embodied as the narrowest part of the cylinder, and it is defined as the lower part (25).
• the valve piece's (20) region where the high pressure region (16) begins in the outer side is defined as the middle region (24).
• Chamfer (241) is embodied to the corner which is formed during the diameter widening formed during passage from the lower part (25) to the middle part (24) of the valve piece (20).
• the valve piece (20) widens at the vicinity of the high pressure region (16) from inside by means of the chamfer (not illustrated in the figure) and the space between the valve piece (20) and the valve piston (30) narrows.
• valve piece (20) There is a space at the top point between the valve piston (30) and the valve piece (20). This space is defined as the control volume (22). At the vicinity of the control volume (22), In order for the fuel filtered on the middle part (24) through the filter to reach the region, a passage opening (21) is embodied on the valve piece (20) and when this passage opening (21) is viewed from the cross section, it has a funnel like appearance.
• the valve piece (20) is embodied so as to be adjacent to the control volume (22) and by widening the diameter at the continuation of the middle part (24), on the input region (12) side of the valve piston (30).
• the valve piston (30) is so that it will completely cover the high pressure region (16) from the top point in this region and so that there is no space between it and the valve channel (19).
• the squashed washer (14) is in connection so as to correspond between the upper part (23) and the seating surface (15). This region is defined as the second sealing region (50).
• the function of the valve piece (20) during this process is to separate the high pressure region (16), where the valve channel (19) and the valve piston (30) operates, from the low pressure regions (17) existing inside the injection valve body (11).
• the function of the squashed washer (14) existing between the seating surface (15) of the valve piece (20) is to facilitate the seating of the valve piece (20) onto the seating surface (15) in a tight manner during assembly and to form the second sealing region (50).
• the purpose of the chamfer (241), existing on the valve piece (20) embodied widely by means of the chamfer (241), is to seat the surfaces, which are embodied by breaking chamfer (18) between the said regions on the valve channel (19) embodied by widening between the low pressure region (17) and the high pressure region (16), so as to be mutual and completely on each other and to provide sealing.
• the valve piston (30) is seated to the space existing in the valve piece (20) in figurative means the valve piece (20) is seated completely onto the seating surface (1 5) embodied on the body (11) by means of the upper part (23).
• the squashed washer (14) is in connection, existing between the part of the upper part (23) corresponding to the seating surface (15) part and the seating surface (15).
• the valve piece (20) is assembled to the region by means of the angle moment controlled assembly member. Meanwhile, the squashed washer (14) is squashed between the seating surface (15) and the valve piece (20) and after this squashing process is completed, the assembly member, which is angle moment controlled begins counting the real revolution thereof. However, during the assembly process realized, an uncertainty of 10 ⁇ is formed along the valve piece (20).
• the squashed washer (14) is in connection with the region in order to form a firm second sealing region (50) and in order to provide said uncertainty, formed during assembly, to be within length tolerance values.
• the chamfer (241) exists on the outer surface of the valve piece (20) and the chamfer (18) existing on the valve channel (19) seat onto each other meanwhile and the first sealing region (40) is formed.
• sealing problems may be faced in a formal manner.
• the space existing on the circular sealing region formed by the chamfers (18, 24) as a result of the seating of the chamfers (18, 24) one above the other is equal to one fourth of the space existing in the present system.
• a squashing occurs in the chamfer (18) existing on the valve channel (19) and the chamfers (18, 24) engage to each other by squashing each other 2 ⁇ .
• the leakage regions existing inside the sealing region (40) is one fourth of the leakage regions in the present system and these leakage regions are disappear substantially as a result of the squashing of the chamfers (18, 24).
• the protection scope of the present invention is set forth in the annexed claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

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Citations (5)

• 2011
  • 2011-07-22 TR TR2011/07274A patent/TR201107274A2/xx unknown
• 2012
  • 2012-07-16 WO PCT/EP2012/063886 patent/WO2013014013A1/en active Application Filing

Patent Citations (5)

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