WO2017047941A1

WO2017047941A1 - Pulsation reducer using double-sided multilayer waveform spring

Info

Publication number: WO2017047941A1
Application number: PCT/KR2016/009332
Authority: WO
Inventors: 황현식
Original assignee: 황현식
Priority date: 2015-09-14
Filing date: 2016-08-23
Publication date: 2017-03-23

Abstract

The present invention relates to a pulsation reducer which comprises: an inlet-expanded fuel rail (40) on which a cross-sectionally expanded fuel rail inlet (41) is formed expanded to the same size as the cross section of a high pressure fuel line (31); a spring housing (61) within which a fuel storage space (611), a low pressure movement space (613) connected to the fuel storage space (611) via communicating holes (612a, 612b), and a high pressure movement space (614) are formed; connecting parts (62a, 62b, 62c) connecting the spring housing (61) and the inlet-expanded fuel rail (40); a low pressure reducing part (63) having a low pressure multilayer waveform spring (631) disposed in the low pressure movement space (613), and reducing compound pulse waves in a low pressure region; and a high pressure reducing part (64) having a high pressure multilayer waveform spring (641) disposed in the high pressure movement space (614), and reducing compound pulse waves in a high pressure region. The fuel storage space (611) is connected to the inside of the inlet-expanded fuel rail (40), and compound pulse waves, together with fuel, progress from inside the inlet-expanded fuel rail (40) through the fuel storage space (611) and arrive at the low pressure reducing part (63) and the high pressure reducing part (64) so as to be reduced.

Description

Pulsation reducer using double-sided multilayer corrugated spring

The present invention relates to a pulsation reducer using a double sided multilayer corrugated spring.

Automotive gasoline engines are divided into multi-port injection (MPI) engines and gasoline direct injection (GDI) engines according to fuel injection methods.

The gasoline direct injection engine supplies fuel stored in the fuel tank to the engine by a low pressure fuel pump. The low pressure fuel supplied to the engine is compressed to high pressure by a high pressure piston fuel pump and supplied to the fuel injection injector via the high pressure fuel pipe and the fuel rail.

The fuel injection injector of the gasoline direct injection engine is configured to directly inject the high pressure fuel pumped into the cylinder. The fuel of the gasoline direct injection engine is made of high pressure and fine spray particles by a fuel injection injector and injected directly into the engine cylinder. The injected fuel is ignited with a spark plug to explode, thus completely burning the fuel. The gasoline direct injection engine has high fuel combustion efficiency and emits exhaust gas that is completely burned, and thus is an engine that can prevent air pollution.

Recently, high pressure gasoline direct injection engines with fuel pressures of 350 bar or more have been developed. The high pressure gasoline direct injection engine consists of a high pressure generator, a high pressure piston fuel pump, a high pressure fuel pipe, a fuel rail and a fuel injection injector.

The high pressure gasoline direct injection engine has a fuel pressure of about 35 bar at low speed and no load operation, and a fuel pressure of 35 bar to 350 bar at high speed.

The high pressure gasoline direct injection engine as described above requires a high pressure piston fuel pump that has a fuel pressure fluctuation range of 10 times or more. High pressure fuel is generated by the high pressure piston fuel pump, and pump pulsations with large amplitudes are generated. In addition, when the high-pressure fuel injection in the fuel injection injector, fuel injection pulsation waves are generated in the fuel rail.

Accordingly, the pump pulsating wave and the mixed pulsating wave having a large amplitude in which the fuel injection pulsating wave is mixed are present in the fuel rail.

When a large mixed pulse wave is transmitted directly to the fuel injection injector, the fuel injection amount changes instantaneously. Due to the fuel injection amount change, the fuel is unstable and the engine combustion efficiency is lowered due to the unstable combustion. Engine exhaust gas is released into the atmosphere due to unsafe combustion of fuel, which causes air pollution, and due to mixed pulsating waves, engine vibration and noise are generated.

For this reason, a wide pressure range pulsation reducer is needed to reduce the mixed pulsation wave of the wide pressure range.

Conventionally, an orifice was installed at the fuel rail inlet to reduce high pressure pulsating waves. The pulsation reducing device using the orifice was used to reduce the pulsating wave by rapidly reducing the fuel rail inlet to 1/10 times the cross-sectional area of the high pressure fuel pipe to generate fuel flow rate and pressure resistance.

The pulsation reducer using the orifice as described above can reduce the pump pulsation wave, but not the fuel injection pulsation wave generated in the fuel rail. In addition, the orifice-based method has a large pump loss (flow rate and pressure loss of the high pressure piston fuel pump) by using fuel resistance.

In addition, patent registration No. 10-1168591 is a pulsation reducer using a disk spring. The pulsation reducer uses a single disk spring and lacks performance in reducing pulsations in a wide pressure range such as gasoline direct injection engines.

In addition, Patent Registration No. 10-1424994 is a pulsation reducer using a composite disk spring. The pulsation reducer reduces pulsation by connecting a piston to the composite spring. The pulsation reducer is an indirect contact pulsation reducer in which pulsating waves in the fuel are transmitted to the composite spring through the piston.

The pulsation reducer has a structure in which pulsating waves in the fuel contact the piston and the pulsating waves do not directly contact the composite spring. The pulsation reducer has a drawback in that it is unable to reduce high frequency pulsations in fuel such as gasoline direct injection engines due to a slow reaction rate in response to high frequency pulsations.

In addition, it has the disadvantage of reducing only the fuel pulsation of the MPI engine in the 4.5 bar pressure range using a single-sided double-sided corrugated spring.

The present invention provides a pulsation reducer using a double-sided multi-layer corrugated spring capable of reducing mixed pulsations in which pump pulsations and fuel injection pulsations present in fuel supplied to the inlet expansion fuel rails are mixed.

The present invention provides a pulsation reducer using a double-sided multi-layer corrugated spring that can improve the vehicle fuel efficiency by removing the pressure and flow loss of the high-pressure piston fuel pump by using the inlet expansion fuel rail.

The present invention provides a pulsation reducer using a double-sided multi-layer corrugated spring that reduces pulsations present in high pressure fuel to reduce vibration and noise of the engine.

The present invention provides a pulsation reducer using a double-sided multi-layer corrugated spring that enables the fuel injection injector to perform multiple stage injections, thereby reducing engine fuel consumption, improving engine output and completely burning fuel.

The present invention provides a pulsation reducer using a double-sided multi-layer corrugated spring that can solve problems such as preventing air pollution caused by automobiles by improving harmful substances discharged through exhaust gas.

The pulsation reducer according to an embodiment of the present invention includes an inlet expansion fuel rail 40 and a fuel storage space 611 in which a cross section expansion fuel rail inlet 41 is formed to extend in the same manner as the cross section of the high-pressure fuel pipe 31. ), A spring housing 61, a spring housing 61, and an inlet expansion, in which a low pressure exercise space 613 and a high pressure exercise space 614 connected to the fuel storage space 611 through the

communication holes

612a and 612b are formed therein.

Arrangements

62a, 62b and 62c connecting the fuel rails 40, the low pressure reducing unit 63 disposed in the low pressure motion space 613 to absorb the mixed pulse wave in the low pressure region, and the high pressure motion space 614. And a high pressure reduction portion 64 for absorbing the mixed pulsating wave in the high pressure region, and the fuel reservoir 611 is connected to the inside of the inlet expansion fuel rail 40, and the mixed pulsation wave together with the fuel. The low pressure reducing unit 63 and the high pressure sense through the fuel storage space 611 inside the 40. It is reduced to reach the unit 64.

The low pressure reducing unit 63 includes a low pressure multilayer wave spring 631 for reducing the mixed pulsation wave in the low pressure region and a low pressure spring cover 632 for fixing the low pressure multilayer wave spring 631 in the low pressure motion space 613. The center of the inner surface of the low pressure multilayer corrugated spring 631 is connected to the fuel storage space 611 through a communication hole 612a, and the outer surface of the low pressure multilayer corrugated spring 631 and the low pressure spring cover 632 facing each other. The inner central portion forms a curved space with each other, and a low pressure spring motion space 632a is formed in which the low pressure multilayer corrugated spring 631 vibrates.

A low pressure spring cushion pad 632b having a curved shape is provided on the inner curved surface of the low pressure spring cover 632 so that the low pressure spring cushion pad (when the low pressure multi-layer corrugated spring 631 contacts the low pressure spring cover 632 by vibration and expansion ( In 632b), the shock is buffered and absorbed.

The low pressure multilayer wave spring 631 includes a first low pressure wave spring 631a and a second low pressure wave spring 631b, and the first low pressure wave spring 631a and the second low pressure wave spring 631b are different from each other. It is formed of material and thickness.

An inner surface of the spring housing 61 constituting the edge of the low pressure spring cover 632, the edge of the low pressure multi-layer corrugated spring 631, and the low pressure motion space 613 overlaps, and an inner edge of the low pressure spring cover 632 along the circumferential direction. A pressing groove 634b into which an edge of the low pressure multi-layer corrugated spring 631 is inserted is formed, and a pressing protrusion 634a for pressing the low-pressure multi-layer corrugated spring 631 into the pressing groove 634b on the inner surface of the spring housing 61. ) Is formed, the outer surface of the low-pressure spring cover 632 is in close contact with the inner surface of the spring housing (61).

The low pressure reducing unit 63 is disposed between the inner surface of the spring housing 61 constituting the low pressure motion space 613 and the low pressure multi-layer corrugated spring 631 to maintain the primary airtight while mixing the low pressure in the inlet expansion rail 40. It further includes a low pressure spring airtight corrugation membrane 635 for absorbing pulsating waves, and a low pressure spring cover o-ring 636 disposed between the inner surface of the spring housing 61 and the outer surface of the low pressure spring cover 632.

The high pressure reduction unit 64 includes a high pressure multilayer wave spring 641 for reducing the mixed pulsation wave in the high pressure region and a high pressure spring cover 642 for fixing the high pressure multilayer wave spring 641 in the high pressure motion space 614. The center of the inner surface of the high pressure multilayer corrugated spring 641 is connected to the fuel storage space 611 through the communication hole 612b, and the outer surface of the high pressure multilayer corrugated spring 641 and the high pressure spring cover 642 facing each other. A central portion of the inner surface forms a curved space, and a high pressure spring motion space 642a in which the high pressure multilayer corrugated spring 641 vibrates is formed therebetween.

A high pressure spring cushion pad 642b having a curved shape is installed on the inner curved surface of the high pressure spring cover 642 so that the high pressure spring cushion pad (when the high pressure multilayer wave spring 641 contacts the high pressure spring cover 642 by vibration and expansion ( 642b) has a structure in which the shock is absorbed and absorbed.

The high pressure multilayer wave spring 641 includes a first high pressure wave spring 641a, a second high pressure wave spring 641b, and a third high pressure wave spring 641c. The first high pressure wave spring 641a, the second high pressure wave spring 641b, and the third high pressure wave spring 641c are formed of different materials and thicknesses.

The inner surface of the spring housing 61 constituting the edge of the high pressure spring cover 642 and the edge of the high pressure multilayer corrugated spring 641 and the high pressure movement space 614 is overlapped, and the inner edge of the high pressure spring cover 642 along the circumferential direction. A pressing groove 644b is formed in which an edge of the high pressure multilayer corrugated spring 641 is inserted, and a pressing protrusion 644a pressurizes the high pressure multilayer corrugated spring 641 to the pressing groove 644b on the inner surface of the spring housing 61. ) Is formed, the outer surface of the high-pressure spring cover 642 is in close contact with the inner surface of the spring housing (61).

The high pressure reduction unit 64 is disposed between the inner surface of the spring housing 61 constituting the high pressure movement space 614 and the high pressure multi-layer corrugated spring 641 to maintain high pressure mixing in the inlet expansion rail 40. And a high pressure spring cover o-ring 646 disposed between the inner surface of the spring housing 61 and the outer surface of the high pressure spring cover 642 to absorb the pulsating wave.

The connecting portion 62a includes a connecting nib 621 that can be coupled to the inlet extension fuel rail 40, and a connecting tube 622 connected to the spring housing 61 and detachably coupled to the connecting nib 621. And a connecting nut 624 for coupling the connecting tube 622 and the connecting nibble 621 and a nibble O-ring 625b disposed between the inner surface of the connecting nib 621 facing the lower surface of the connecting tube 622. .

The connecting portion 62a further includes a positioning groove 623a and a positioning protrusion 623b formed at a portion where the connecting nibble 621 and the connecting pipe 622 contact each other, and the positioning protrusion 623b includes a positioning groove. When inserted into 623a, the direction of the spring housing 61 is set.

The connecting portion 62b has a fastening hole 626d and a connecting socket 626 which can be engaged with the inlet expansion fuel rail 40, a flange bolt formed in the spring housing 61 and fastened to the fastening hole 626d. 627 and a socket o-ring 626c between the flange bolt 627 and the connecting socket 626, wherein the connecting socket 626 and the flange bolt 627 are inside the inlet expansion fuel rail 40 and the fuel. A socket passage 626a and a flange connection passage 627a connecting the storage space 611 are formed.

The connector 62c is connected to the housing connector 628 and the housing connector 628 protruding from the spring housing 61 and to the connector flange 629 which is in contact with the outer surface of the inlet expansion fuel rail 40. The housing connector 628 has an inner connector passage 628a connecting the fuel reservoir 611 and the inlet extension fuel rail 40 to the inside, and the inlet extension fuel rail 40 and the spring are formed. It is integrally bonded at the brazing surface 629a which bonds to one body while maintaining fuel tightness between the housings 61.

The insertion tube 647 is inserted between the internal connector passage 628a of the connector flange 629 and the fuel rail hole 42 to extend the brazing surface 629a to extend the connector flange 629 and the inlet expansion fuel. It is a structure that improves the joining strength between the rails (40).

The pulsation reducer according to the embodiment of the present invention is installed in the inlet extension fuel rail from which the cross-sectional reduced orifice is removed by making the fuel rail inlet cross-sectional area equal to that of the high pressure fuel pipe coupled with the inlet extension fuel rail. The mixed pulsation wave of the pump pulsation wave generated from the high pressure piston fuel pump of the gasoline direct injection engine and the fuel injection pulsation wave generated from the fuel injection injector is generated by the low pressure and high pressure multilayer wave spring divided into the low pressure region and the high pressure region inside the pulsator. Is reduced. Accordingly, it is possible to obtain a pulsation reducer without the resistance loss of the fuel supplied by the driving of the high pressure piston fuel pump.

According to an embodiment of the present invention, the pulsation reducer is installed in the inlet expansion fuel rail from which the orifice has been removed, thereby reducing the mixed pulsation wave existing in the inlet expansion fuel rail, and reducing the noise and vibration of the engine due to the reduced pulsation wave It is effective.

According to the embodiment of the present invention, due to the removal of the mixed pulsating wave in the fuel it is possible to multi-stage injection that is injected 2 to 5 times per cycle when fuel injection to the engine cylinder. Since the fuel is completely burned by the multi-stage fuel injection, the engine combustion efficiency is improved. In addition, carbide mass (PM) and carbon number (PN), which are engine exhaust regulations, can be reduced.

1 is a configuration diagram showing a pulsation reducer installation state according to an embodiment of the present invention.

2 is a longitudinal sectional perspective view of the pulsation reducer of FIG.

3 is an exploded perspective view of the spring housing, the low pressure reducing unit and the high pressure reducing unit of FIG.

Figure 4 is an exploded perspective view of the connecting portion of FIG.

5 is a longitudinal sectional perspective view of the low pressure multilayer corrugated spring of FIG. 2;

6 is a longitudinal sectional perspective view of the high pressure multilayer corrugated spring of FIG. 2;

7 is an exploded cross-sectional view of a pulsation reducer according to another embodiment of the present invention.

8 is a cross-sectional view showing a coupling state of FIG.

9 is a cross-sectional view showing a pulsation reducer according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Like parts are designated by like reference numerals throughout the specification.

Then, the pulsation reducer according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

1 is a configuration diagram showing a pulsation reducer installed state according to an embodiment of the present invention, Figure 2 is a longitudinal cross-sectional perspective view of the pulsation reducer of Figure 1, Figure 3 is a spring housing, a low pressure reducing portion and high pressure of Figure 2 Figure 4 is an exploded perspective view of the reduced portion, Figure 4 is an exploded perspective view of the connecting portion of Figure 2, Figure 5 is a longitudinal cross-sectional perspective view of the low pressure multi-layer corrugated spring of Figure 2, Figure 6 is a longitudinal cross-sectional perspective view of the high pressure multilayer corrugated spring of FIG.

First, referring to FIG. 1, the gasoline fuel stored in the fuel tank 10 is first transmitted to the high pressure piston fuel pump 30, which is a high pressure fuel generator, through the low pressure fuel pipe 21 by the operation of the low pressure fuel pump 20. do. The low pressure fuel pump 20 is driven by the low pressure fuel pump motor 22. The low pressure fuel pump 20 uses a vane type pump, and the low pressure fuel pressure transmitted from the low pressure fuel pump 20 to the high pressure piston fuel pump 30 is a low pressure within about 4.5 bar.

The low pressure fuel is secondarily compressed to high pressure by the operation of the high pressure piston fuel pump 30 and is supplied into the inlet expansion fuel rail 40 through the high pressure fuel pipe 31 through the sectional expansion fuel rail inlet 41. The inlet expansion fuel rail 40 is a cross section expansion fuel rail inlet 41 with the orifice installed in the existing fuel rail inlet removed and connected to the high pressure fuel pipe 31, the cross section being the same as the cross section of the high pressure fuel pipe 31. It has an extended cross section extended fuel rail inlet 41.

The high pressure fuel pipe 31 connects the high pressure fuel pipe nut 31b inserted into the high pressure fuel pipe end flange 31a and the inlet expansion fuel rail nibble 40a attached to one end of the inlet expansion fuel rail 40 and the high pressure fuel pipe. It is connected with the screw 31c.

The high pressure piston fuel pump 30 is driven by the high pressure fuel pump cam 32 connected to the engine camshaft. The high pressure piston pump 30 uses a piston type pump to generate high pressure fuel over 350 bar.

Since the high pressure fuel reaching the inlet expansion fuel rail 40 is accompanied by a high pressure pulsation wave generated in the high pressure piston fuel pump 30, the high pressure pulsation wave is introduced into the inlet extension fuel rail 40.

Inside the inlet expansion fuel rail 40, there is a mixed pulsation wave in which the pump pulsation wave generated by the high pressure piston fuel pump 30 and the fuel injection pulsation wave generated by the fuel injection injector 50 are mixed.

The mixed pulsation wave may be amplified by generating a resonance phenomenon at a certain frequency, and may be canceled by a cancellation phenomenon at a certain frequency. When amplification and cancellation of the mixed pulsating wave occurs repeatedly, the fuel injection amount of the fuel injection injector 50 occurs irregularly. Irregularities in fuel injection can cause an increase in engine fuel consumption.

The pulsation reducer 60a according to this embodiment was installed in the inlet expansion fuel rail 40 to reduce the mixed pulsation wave.

2 to 6, the pulsation reducer 60a according to the present embodiment includes a spring housing 61, a connecting portion 62a, a low pressure reducing portion 63, and a high pressure reducing portion 64.

The spring housing 61 is connected with the inlet expansion fuel rail 40 through the connection portion 62a. A fuel storage space 611 is formed at the inner center of the spring housing 61 and connected to the inside of the inlet expansion fuel rail 40 through the connecting portion 62a.

The inner left side of the spring housing 61 has a low pressure motion space 613 connected to the fuel storage space 611 through a connector pipe passage 625a.

The inner right side of the spring housing 61 is formed with a high-pressure movement space 614 connected to the fuel storage space 611 through a connector pipe passage 625a.

The connecting portion 62a includes a connecting nibble 621, a connecting pipe 622, a positioning unit 623, a connecting nut 624, and a nibble o-ring 625b.

The connecting nibble 621 has a predetermined length and penetrates up and down inside. The lower surface of the connecting nibble 621 is fixed in contact with the outer surface of the inlet expansion fuel rail 40. The interior of the connecting nibble 621 is connected to the interior of the inlet expansion fuel rail 40. An o-ring jaw 621a is formed at an inner lower side of the connecting nibble 621. A screw is formed on the outer peripheral surface of the connecting nibble 621.

The connector tube 622 has a predetermined length and the upper surface is coupled to the housing sleeve 625 of the spring housing 61 and the lower surface of the connector flange 622a is in contact with the upper surface of the connecting nibble 621. The housing sleeve 625 protrudes in the direction of the connecting pipe 622 while surrounding the inner side of the spring housing 61.

A connector flange 622a is formed on the middle outer circumferential surface of the connector tube 622.

The inside of the connecting pipe 622 is penetrated up and down and is connected to the fuel storage space 611. The lower bottom surface of the connecting pipe 622 has an O-ring sealing surface 622b in contact with the nibble O-ring 625b.

The positioning unit 623 includes two pairs of positioning grooves 623a and positioning projections 623b.

The positioning groove 623a is formed at the upper side before and after the connector pipe flange 622a.

The positioning projection 623b is protruded to the upper side before and after the upper surface of the connecting nibble 621 to be inserted into the positioning groove 623a. By coupling the positioning protrusion 623b and the positioning groove 623a, the spring housing 61 may always be coupled in the same direction at the same position.

The connection nut 624 penetrates up and down inside. The inner lower circumferential surface of the connecting nut 624 is formed with a screw engaged with the screw of the connecting nibble 621. A connection nut tuck 624a is formed on the inner circumferential surface of the connection nut 624 in close contact with the connector flange 622a. When the connection nut 624 and the connection nibble 621 are fastened with a screw, the connection nut jaw 624a presses the connector flange 622a in the direction of the connection nibble 621. The upper surface of the connection nibble 621 and the lower surface of the connector flange 622a are closely contacted by the connector flange 622a that is pressurized.

The low pressure reducing portion 63 includes a low pressure multi-layer corrugated spring 631, a low pressure spring cover 632, a low pressure spring hermetic waveform membrane 635, and a low pressure spring cover o-ring 636 to reduce the mixed pulsation wave in the low pressure region. .

The low pressure multilayer corrugated spring 631 includes a first low pressure corrugated spring 631a and a second low pressure corrugated spring 631b and is disposed on the left side of the low pressure motion space 613.

The first low pressure waveform spring 631a and the second low pressure waveform spring 631b are formed in the same structure. The first low pressure waveform spring 631a and the second low pressure waveform spring 631b overlap each other.

The central portion of the first low pressure wave spring 631a is connected to the fuel storage space 611 through the communication hole 612a. The edge of the first low pressure wave spring 631a is in contact with the inner surface of the spring housing 61 forming the low pressure motion space 613.

The cross section which cut | disconnected the 1st low pressure waveform spring 631a and the 2nd low pressure waveform spring 631b is wavy.

The low pressure spring cover 632 is disposed on the left side of the low pressure motion space 613 and fixes the low pressure multi-layer corrugated spring 631 in the low pressure motion space 613.

The inner surface edge of the low pressure spring cover 632 is in close contact with the outer surface edge of the second low pressure wave spring 631b. Accordingly, the edge of the low pressure spring cover 632, the edge of the low pressure multi-layer corrugated spring 631, and the inner surface of the spring housing 61 overlap each other.

The inner surface edge of the low pressure spring cover 632 is formed with a pressing groove 634b into which the edge of the low pressure multilayer wave spring 631 is inserted along the circumferential direction. On the inner surface of the spring housing 61, a pressing protrusion 634a for pressing the low pressure multi-layer corrugated spring 631 into the pressing groove 634b is formed.

The outer surface of the low pressure spring cover 632 is in close contact with the inner surface of the spring housing 61. The low pressure spring cover fixing plate 633 formed on the spring housing 61 is coupled to the outer surface of the low pressure spring cover 632.

The low pressure multi-layer corrugated spring 631 and the low pressure spring cover 632 are fixed in the low pressure movement space 613 by the low pressure spring cover fixing plate 633 and the pressure protrusion 634a.

The outer circumferential surface of the low pressure multilayer corrugated spring 631 is spaced apart from the inner circumferential surface of the spring housing 61. When the outer circumferential surface of the low pressure multilayer corrugated spring 631 is in contact with the inner circumferential surface of the spring housing 61, the resistance when the low pressure multilayer corrugated spring 631 is coupled between the pressing protrusion 634a and the pressing groove 634b is resisted. This can happen. However, the outer circumferential surface of the low pressure multilayer corrugated spring 631 and the inner circumferential surface of the spring housing 61 are separated so that the low pressure multilayer corrugated spring 631 can be easily coupled between the pressing protrusion 634a and the pressing groove 634b without generating resistance. Can be.

The central portion of the low pressure spring cover 632 forms a curved space from the outer surface of the second low pressure wave spring 631b. Accordingly, a low pressure spring motion space 632a is formed between the low pressure spring cover 632 and the center portion of the second low pressure waveform spring 631b.

The edge of the low pressure multilayer corrugated spring 631 is fixed and the center part is located in space. In the fuel storage space 611, a mixed pulsating wave in the low pressure region is applied to the center of the low pressure multi-layer corrugated spring 631. The mixed pulsation wave in the low pressure region causes the central portion of the low pressure multi-layer corrugated spring 631 to vibrate, thereby reducing the mixed pulsation wave in the low pressure region.

The low pressure spring hermetic corrugated film 635 is disposed between the low pressure multilayer corrugated spring 631 and the inner surface of the spring housing 61. The low pressure spring hermetic corrugation membrane 635 is present in the inlet extension rail 40 while maintaining primary airtight such that fuel in the fuel reservoir 611 does not leak between the low pressure multilayer corrugated spring 631 and the spring housing 61. It absorbs low pressure mixed pulsating waves.

The low pressure spring cover o-ring 636 is disposed between the outer circumferential surface of the low pressure spring cover 632 and the inner circumferential surface of the spring housing 61 and maintains secondary hermeticity.

The high pressure reduction unit 64 includes a high pressure multilayer wave spring 641, a high pressure spring cover 642, a high pressure spring hermetic wave film 645, and a high pressure spring cover o-ring 646 to reduce the mixed pulsation wave in the high pressure region.

The high pressure spring cover 642, the high pressure spring gas tight membrane 645, and the high pressure spring cover o-ring 646 implement the low pressure spring cover 632, the low pressure spring gas tight membrane 635 and the low pressure spring cover o-ring 636 described above. Since it is the same as the example, duplicate description will be omitted.

However, there is a difference between the high pressure multi-layer corrugated spring 641 and the low pressure multi-layer corrugated spring 631. The low pressure multilayer corrugated spring 631 includes first and second low pressure corrugated

springs

631a and 631b, while the high pressure multilayer corrugated spring 641 includes first, second and third high pressure

corrugated springs

641a and 641b. 641c). That is, the high pressure multilayer corrugated spring 641 further includes a third high pressure corrugated spring 641c.

The third high pressure wave spring 641c is formed in the same structure as the first and second high pressure wave springs 641a and 641b. The third high pressure wave spring 641c is disposed between the high pressure spring covers 642. The high pressure spring movement space 642a is formed between the third high pressure wave spring 641c and the high pressure spring cover 642.

Accordingly, the edge of the high pressure multi-layer corrugated spring 641 is fixed between the pressing protrusion 644a and the pressing groove 644b and the center portion is located in the space. The mixed pulsation wave of the high pressure region is applied to the center of the high pressure multilayer corrugated spring 641 in the fuel storage space 611. The mixed pulsation wave in the high pressure region is reduced while the central portion of the high pressure multilayer wave spring 641 vibrates due to the mixed pulsation wave in the high pressure region.

Next, the operation of the pulsation reducer 60a described above will be described with reference to FIGS. 1 to 6 again.

The mixed pulsation wave present in the inlet extension fuel rail 40 passes through the fuel rail hole 42 through the connector passage 625a and through the housing connection passage 616 to reach the fuel reservoir 611. do.

The mixed pulsation wave reaching the fuel storage space 611 vibrates the low pressure multilayer corrugated spring 631 and the high pressure multilayer corrugated spring 641. That is, due to the low pressure region (35 bar ~ 100 bar) pulsating wave of the mixed pulsating wave reaching the fuel storage space 611, the low pressure multi-layer corrugated spring 631 performs the oscillating plate motion in the low pressure spring movement space 632a. Due to the low pressure multilayer wave spring 631 oscillating plate motion, the mixed pulsation wave in the low pressure region 35bar to 100bar in the fuel is reduced.

In addition, due to the high pressure region (100bar to 350bar) pulsating wave of the mixed pulsating wave reaching the fuel storage space 611 in the same manner, the high pressure multi-layer corrugated spring 641 performs the oscillating plate motion in the high pressure spring movement space 642a. . Due to the shaking plate motion of the high pressure multilayer wave spring 641, the mixed pulsation wave of the high pressure region 100bar to 350bar is also reduced.

As described above, the mixed pulsation wave existing in the inlet expansion fuel rail 40 is reduced by the low pressure multilayer wave spring 631 and the high pressure multilayer wave spring 641 in the spring housing 61 and then disappear.

The high pressure fuel in which the mixed pulsating wave disappears due to the pulsation reducer 60a according to the present embodiment is injected into the engine cylinder 50a by the fuel injection injector 50 as fine particles at a predetermined pressure. As a result, the engine combustion efficiency is increased to improve the fuel economy of the vehicle.

In addition, the mixed pulsation wave in the fuel can be more effectively extinguished with the orifice which is a conventional pulsation damper removed. The engine efficiency is further improved by reducing the pump loss of the high pressure piston fuel pump 30.

In addition, due to the pulsation reducer 60a according to the present embodiment, since the mixed pulsation wave in the fuel disappears, engine vibration and noise reduction effects occur.

In addition, the high-pressure fuel in which the pulsation is extinguished through the pulsation reducer 60a according to the present embodiment is made into fine particles of a predetermined pressure by the fuel injection injector 50 and is injected directly to the engine cylinder 50a. Therefore, the fuel may be injected in two to five times in one stroke when the fuel is multi-stage injection, that is, the fuel injection to the engine. Fuel combustion is completely burned by the fuel multi-stage injection, so the engine combustion efficiency can be further improved.

Since the pulsation-reduced fuel as described above is completely burned in the engine, harmful substances caused by incomplete combustion of the fuel are not generated, thereby greatly reducing air pollution.

Next, another embodiment of the present invention will be described with reference to FIGS. 7 and 8.

7 is an exploded cross-sectional view showing a pulsation reducer according to another embodiment of the present invention, Figure 8 is a cross-sectional view showing a coupling state of FIG.

Referring to FIGS. 7 and 8, the pulsation reducer 60b according to the present embodiment is overlapped since all components except the connection part 62b are the same as the pulsation reducer components according to the embodiment of FIGS. 1 to 6. The description will be omitted.

The connecting portion 62b according to the present embodiment includes a connecting socket 626, a flange bolt 627, and a socket o-ring 626c, and the inlet expansion fuel rail 40 is formed inside the connecting socket 626 and the flange bolt 627. The socket passage 626a and the flange connecting passage 627a connecting the inside and the fuel storage space 611 are formed.

The connection socket 626 may be coupled to a predetermined position on the outer circumferential surface of the inlet extension fuel rail 40. The interior of the connection socket 626 is vertically penetrated and connected to the interior of the inlet expansion fuel rail 40. An inner lower side of the connection socket 626 is formed with an O-ring jaw 626b for supporting the socket O-ring 626c. Screws are formed on the inner circumferential surface of the connection socket 626.

The flange bolt 627 projects vertically from the housing flange 627b formed on the outer circumferential surface of the spring housing 61. The inside of the flange bolt 627 and the housing flange 627b are vertically penetrated and connected to the fuel storage space 611.

The lower side of the flange bolt 627 is inserted into the connection socket 626. The outer circumferential surface of the flange bolt 627 is formed with a screw that engages with the connecting socket 626 screw.

When the flange bolt 627 is coupled to the connection socket 626, the socket o-ring 626c is compressed between the flange bolt 627 and the o-ring jaw 626b to maintain airtightness.

That is, the housing flange 627b and the flange bolt 627 connected to the spring housing 61 are installed for screw assembly of the pulsation reducer 60b according to the present embodiment. The flange bolts 627 are coupled to the connection socket 626 and fastened to each other to allow screw assembly.

A flange connection passage 627a is formed inside the flange bolt 627 for the mixed pulse wave transmission from the inlet extension fuel rail 40 to the fuel storage space 611 of the spring housing 61. Mixed pulsation waves present in the inlet expansion fuel rail 40 pass through the fuel passage hole 42 and the socket passage 626a together with the fuel to be delivered to the fuel storage space 611 via the flange connection passage 627a. Can be.

Then, the socket o-ring 626c is mounted between the o-ring jaw 626b of the connecting socket 626 and the lower end of the flange bolt 627 and fastened and assembled with the flange bolt 627 to install the inlet extension fuel rail 40 and the spring housing ( 61) to maintain confidentiality.

In other configurations, the configuration of the embodiment of FIGS. 1 to 6 may be applied as it is.

Next, another embodiment of the present invention will be described with reference to FIG. 9.

Referring to FIG. 9, the pulsation reducer 60c according to the present embodiment is the same as the pulsation reducer component according to the embodiment of FIGS. 1 to 6 except that all components except the connection part 62c are duplicated. It will be omitted.

The connecting portion 62c according to the present embodiment includes a housing connector 628 and a connector flange 629. The housing connector 628 includes a fuel reservoir 611 and an inlet expansion fuel rail 40. A housing connector passage 628a is formed to connect.

The housing connector 628 has a predetermined length and projects perpendicularly from the outer circumferential surface of the spring housing 61. The housing connector passage 628a connected to the fuel storage space 611 passes through the housing connector tube 628 up and down. The end of the housing connector 628 is joined to the outer circumferential surface of the inlet extension fuel rail 40.

The connector flange 629 extends the area where the housing connector 628 abuts the inlet expansion fuel rail 40. The connector flange 629 is brazed to the inlet expansion fuel rail 40.

That is, the spring housing 61 and the housing connector 628 and the connector flange 629 are integrally formed to integrally assemble the pulsation reducer 60c according to the present embodiment to the inlet expansion fuel rail 40. It is.

A housing connector passage 628a is formed inside the housing connector 628 for mixed pulsating wave transmission from within the inlet extension fuel rail 40 to the fuel reservoir 611 of the spring housing 61.

Mixed pulsation waves present in the inlet extension fuel rail 40 are allowed to be delivered to the fuel reservoir 611 through the fuel rail hole 42 and the housing connector passage 628a.

A brazing surface 629a was formed between the connector flange 629 and the outer circumferential surface of the inlet expansion fuel rail 40 for fuel tightness between the inlet expansion fuel rail 40 and the spring housing 61. The inlet expansion fuel rail 40 and the connector flange 629 are integrally joined by the brazing surface 629a so that airtightness is maintained between the inlet expansion fuel rail 40 and the spring housing 61.

The insertion tube 647 is inserted between the housing connector passage 628a of the connector flange 629 and the fuel rail hole 42 to extend the brazing surface 629a to extend the connector flange 629 and the inlet expansion fuel. The structure which improves the joining strength between the rails 40 is carried out.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

An inlet extension fuel rail 40 in which a cross section extension fuel rail inlet 41 is formed that is extended in the same manner as the cross section of the high-pressure fuel pipe 31;

A spring housing 61 having a fuel storage space 611, a low pressure movement space 613 and a high pressure movement space 614 connected to the fuel storage space 611 through communication holes 612a and 612b,

Connections 62a, 62b, 62c connecting the spring housing 61 and the inlet extension fuel rail 40;

A low pressure reducing unit 63 disposed in the low pressure motion space 613 to absorb the mixed pulse wave in the low pressure region;

The high pressure reducing unit 64 is disposed in the high pressure motion space 614 to absorb the mixed pulsation wave in the high pressure region.

Including,

The fuel reservoir 611 is connected to the inside of the inlet expansion fuel rail 40, and the mixed pulsation wave is connected to the low pressure reducing unit 63 through the fuel reservoir 611 in the inlet expansion fuel rail 40 together with the fuel. Reaching the high pressure reduction section 64 and reduced

Pulsation reducer.
In claim 1,

Low pressure reduction unit 63,

A low pressure multi-layer corrugated spring 631 for attenuating mixed pulsating waves in the low pressure region, and

Low pressure spring cover 632 for fixing the low pressure multilayer corrugated spring 631 in the low pressure motion space 613.

Including,

The inner center of the low pressure multilayer corrugated spring 631 is connected to the fuel storage space 611 through a communication hole 612a, and the outer surface of the low pressure multilayer corrugated spring 631 and the inner center of the low pressure spring cover 632 facing each other. The portions form a curved space with each other, and a low pressure spring motion space 632a is formed in which the low pressure multilayer corrugated spring 631 vibrates.

Pulsation reducer.
In claim 2,

The low pressure multilayer wave spring 631 includes a first low pressure wave spring 631a and a second low pressure wave spring 631b, and the first low pressure wave spring 631a and the second low pressure wave spring 631b are different from each other. Pulsation reducer formed of material and thickness.
In claim 2,

An inner surface of the spring housing 61 constituting the edge of the low pressure spring cover 632, the edge of the low pressure multi-layer corrugated spring 631, and the low pressure motion space 613 overlaps, and an inner edge of the low pressure spring cover 632 along the circumferential direction A pressing groove 634b into which an edge of the low pressure multi-layer corrugated spring 631 is inserted is formed, and a pressing protrusion 634a for pressing the low-pressure multi-layer corrugated spring 631 into the pressing groove 634b on the inner surface of the spring housing 61. ) Is formed, the outer surface of the low-pressure spring cover 632 is in close contact with the inner surface of the spring housing 61

Pulsation reducer.
In claim 2,

Low pressure reduction unit 63,

Low pressure spring air tightness disposed between the inner surface of the spring housing 61 constituting the low pressure motion space 613 and the low pressure multi-layer corrugated spring 631 to absorb the low pressure mixed pulsating wave in the inlet expansion rail 40 while maintaining the primary air tightness Waveform film 635, and

Low pressure spring cover o-ring 636 disposed between the inner surface of the spring housing 61 and the outer surface of the low pressure spring cover 632.

Containing more

Pulsation reducer.
In claim 1,

High pressure reduction unit 64,

A high pressure multilayer corrugated spring 641 that attenuates mixed pulsating waves in the high pressure region; and

High pressure spring cover 642 securing high pressure multilayer corrugated spring 641 in high pressure movement space 614.

Including,

The inner center of the high pressure multilayer corrugated spring 641 is connected to the fuel storage space 611 through the communication hole 612b, and the outer surface of the high pressure multilayer corrugated spring 641 and the inner center of the high pressure spring cover 642 facing each other. The portions form a curved space with each other, and a high pressure spring motion space 642a in which the high pressure multilayer corrugated spring 641 vibrates is formed therebetween.

Pulsation reducer.
In claim 6,

The high pressure multilayer wave spring 641 includes a first high pressure wave spring 641a, a second high pressure wave spring 641b, and a third high pressure wave spring 641c, and includes a first high pressure wave spring 641a and a second A pulsation reducer in which the high pressure wave spring 641b and the third high pressure wave spring 641c are made of different materials and thicknesses.
In claim 6,

The inner surface of the spring housing 61 constituting the edge of the high pressure spring cover 642 and the edge of the high pressure multilayer corrugated spring 641 and the high pressure movement space 614 is overlapped, and the inner edge of the high pressure spring cover 642 along the circumferential direction. A pressing groove 644b is formed in which an edge of the high pressure multilayer corrugated spring 641 is inserted, and a pressing protrusion 644a pressurizes the high pressure multilayer corrugated spring 641 to the pressing groove 644b on the inner surface of the spring housing 61. ) Is formed, the outer surface of the high-pressure spring cover 642 is in close contact with the inner surface of the spring housing 61

Pulsation reducer.
In claim 6,

High pressure reduction unit 64,

The high pressure spring airtight which is disposed between the inner surface of the spring housing 61 constituting the high pressure motion space 614 and the high pressure multilayer corrugated spring 641 to absorb the high pressure mixed pulsation wave in the inlet expansion rail 40 while maintaining the primary airtightness. Waveform film 645, and

High pressure spring cover o-ring 646 disposed between the inner surface of the spring housing 61 and the outer surface of the high pressure spring cover 642.

Containing more

Pulsation reducer.
In claim 1,

The connecting portion 62a is

Connecting nibble 621, which may be engaged with the inlet expansion fuel rail 40,

A connecting pipe 622 connected to the spring housing 61 and detachably coupled to the connecting nibble 621;

A connecting nut 624 for coupling the connecting pipe 622 to the connecting nibble 621; and

Nibble O-ring 625b disposed between the inner surface of the connecting nib 621 facing the lower surface of the connecting pipe 622.

Containing

Pulsation reducer.
In claim 10,

The connecting portion 62a is

It further includes a positioning groove 623a and a positioning protrusion 623b formed at a portion where the connecting nibble 621 and the connection pipe 622 contact each other.

When the positioning projection 623b is inserted into the positioning groove 623a, the direction of the spring housing 61 is set.

Pulsation reducer.
In claim 1,

The connecting portion 62b is

A connecting socket 626 having a fastening hole 626d and which can be engaged with the inlet expansion fuel rail 40;

A flange bolt 627 formed in the spring housing 61 and fastened to the fastening hole 626d;

Socket o-ring 626c between flange bolt 627 and connecting socket 626

Including;

In the connecting socket 626 and the flange bolt 627, a socket passage 626a and a flange connecting passage 627a are formed to connect the inside of the inlet expansion fuel rail 40 and the fuel storage space 611.

Pulsation reducer.
In claim 1,

The connecting portion 62c is

Housing connector 628 protruding from the spring housing 61 and

Connector flange 629, which is connected to the housing connector 628 and abuts the outer surface of the inlet expansion fuel rail 40.

Including,

A housing connector passage 628a is formed in the housing connector 628 to connect the fuel reservoir 611 and the inlet extension fuel rail 40, and the inlet extension fuel rail 40 and the spring housing 61. Integrally bonded at the brazing surface 629a while maintaining fuel tightness between

Pulsation reducer.
In claim 2,

A low pressure spring cushion pad 632b having a curved shape is provided on the inner curved surface of the low pressure spring cover 632 so that the low pressure spring cushion pad (when the low pressure multi-layer corrugated spring 631 contacts the low pressure spring cover 632 by vibration and expansion ( 632b) is formed in a structure that the shock is absorbed, absorbed

Pulsation reducer.
In claim 6,

A high pressure spring cushion pad 642b having a curved shape is installed on the inner curved surface of the high pressure spring cover 642 so that the high pressure spring cushion pad (when the high pressure multilayer wave spring 641 contacts the high pressure spring cover 642 by vibration and expansion ( 642b) formed of a structure in which the shock is absorbed and absorbed

Pulsation reducer.
In claim 13,

Insert the insertion tube 647 between the housing connector passage 628a of the connector flange 629 and the fuel rail hole 42 to extend the brazing surface 629a to extend the connector flange 629 and the inlet expansion fuel rail. To improve the bonding strength between 40

Pulsation reducer.