WO2010018884A1

WO2010018884A1 - Pressure regulator for fuel system of vehicles

Info

Publication number: WO2010018884A1
Application number: PCT/KR2008/004925
Authority: WO
Inventors: Tae Hee Lee; Seok Yoon Chang; Jun Woo Kim; Min Gi Kim
Original assignee: Inzi Controls Co., Ltd.
Priority date: 2008-08-13
Filing date: 2008-08-22
Publication date: 2010-02-18
Also published as: KR100981086B1; KR20100020653A

Abstract

This invention relates to a pressure regulator for fuel system in vehicles, which comprises; a housing (50) formed with a fuel inlet (50a) and a valve seat (52); a valve member (60) which closes and opens the valve seat (52) of the housing (δθ); a disk member (70) which holds said valve member (60) while allowing vertical travel and formed with fuel hole (70a) or holes; a fixing means which fixes a part of said disk member (70) to said valve member (60); another fixing means which fixes another part of said disk member (70) to said housing (50); an elastic member (80) which supports said disk member elastically; and a cap (90) which encloses said elastic member (80) and formed with a fuel outlet (90a) which is aligned with the inlet of said housing (δθ). In the fuel pressure regulator of this invention, fuel flows linearly from the inlet (δθa) on housing (δθ), via fuel hole (70a) of disk member (70) to the outlet (90a) on cap.

Description

[DESCRIPTION] [Invention Title]

PRESSURE REGULATOR FOR FUEL SYSTEM OF VEHICLES [Technical Field]

<i> This invention relates to a pressure regulator which is installed in fuel tank to control the pressure of fuel feed system of vehicles in accordance with the pressure of fuel. [Background Art]

<2> In general, a pressure regulator for fuel system of vehicles is connected with the fuel return tube from fuel feeder device and fuel tank, and allows the excessive fuel return to the fuel tank only when the pressure of fuel exceeds a certain level to maintain constant pressure in the fuel feed line.

<3> In a pressure regulator as described above, as shown in Fig. 1, the diaphragm(2) is raised by the pressure of the fuel incoming through the inlet(la) formed on the housing(l). As the diaphragm(2) rises, the fuel flows into the lower part of the valve disk(14) which has a ball (12) which reduces the fuel pressure, and moves the valve disk(14) upward. As the diaphragm(2) is pressed by the coil spring(3), the upward movement of the valve disk(14) is restricted. The valve assembly(lθ) is moved upward together with the valve disk(14), the fuel is discharged through the outlet(lb) formed with valve seat (4).

<4> However, in the conventional pressure regulators which are structured as described above, the valve assembly(lθ) incorporates the bal 1(12) , valve disk(lθ) and ball spring(lθa). Therefore, it is difficult to fabricate the valve assembly(lθ) as well as high cost.

<5> In addition, said conventional pressure regulators need a retainer(3a) which supports the coil spring(3) to protect the diaphragm(2) from being damaged by the force applied by the coil spring(3).

<6> In addition, said conventional pressure regulators use a diaphragm(2) which is expensive, weak to thermal shock and chemicals, especially alcohols, and not suitable for precise pressure control over a wide range because the diaphragm is made with rubber material.

<7> Furthermore, in said conventional fuel pressure regulators, the fuel has to flow through complicated path, thus, may cause problems. [Disclosure] [Technical Problem]

<8> In order to solve the problems described hereinabove, this invention provides a pressure regulator for the fuel feed system of vehicles, which employs a valve body formed with a single member which can be installed in the housing, and the valve member is made of low cost material having good durability and can move up and down inside the housing.

<9> In addition, the valve member can be assembled with and disassembled from a rigid body without additional part by designing the rigid body so that the body encompasses and maintains the valve member, and furthermore, the part encompassing the valve member allows the fuel flow.

<io> In addition, this invention provides a pressure regulator for vehicle fuel system incorporating valve member and rigid body which are so structured as to allow the incoming fuel to be distributed into the inside of cap smoothly. [Technical Solution]

<ii> The fuel pressure regulator for vehicles in accordance with this invention, which operates according to the pressure of fuel and satisfies above mentioned technical objects, is characterized by being comprised of; a can-shaped housing formed with a fuel inlet on one side and a valve seat inside! a valve member which is placed on the valve seat of the housing to open and close the valve seat according to the pressure of the fuel flowing through the valve seat; a thin disk member one part of which is fixed with said valve member and the another part is fixed with said housing to hold the valve member while allowing it to move upward or downward, and formed with fuel holes for fuel flow; a fixing means which fixes a part of the disk member to said valve member; a fixing means which fixes another part of the disk member to said housing; an elastic member which elastically supports the disk member, which is fixed to said valve member and housing, to provide the disk member with preliminary stress! and, a cap which encloses the elastic member and integrated with said housing, and formed with a fuel outlet on the opposite side of the inlet of said housing.

<12> The said disk member is characterized by being a metal plate spring formed with one or more fuel holes.

<13> The said plate is characterized by being formed with multiple fuel holes in circumferential direction centering at the center of the plate, connection between the circumference and center and perimeter margin formed by blanking process performed to form the fuel holes, wherein the width of the joint between the connecting part and the perimeter margin is larger than those of said connecting part and the perimeter margin.

<14> The said fixing means comprises; a projection which is formed on the said valve member and penetrates said disk member; and, a stopper which is jointed with the projection to bind it with said disk member.

<15> The said another fixing means is characterized by being formed at the edge of said housing opposite to said cap, in a curled shape to wrap the end of the cap and the housing to press and fix them together with the circumferential edge of said disk member between the two.

<16> The said valve member is characterized by being shaped as a plate, formed with a convex which fits with the valve seat to be able to close the flow path of fuel .

<17> The said valve is characterized by being shaped as a spherical ball valve of which a part is inserted into the valve seat of said housing to be able to close the valve path.

<18> The said disk member is formed with a concave to match with the convex of said valve member.

<i9> The said disk member is characterized by being formed with flow hole or holes at the said concave part to allow flow of fuel.

<20> This invention further incorporates a noiseproof member which prevents noise by preventing collision between said valve member and disk member. <2i> The said noiseproof member is characterized by being a damping retainer placed in-between the said valve member and disk member to dissipate the impact energy of the two members.

<22>

[Description of Drawings] <23> Fig. 1 is a longitudinal section of conventional pressure regulator for vehicle fuel system; <24> Fig. 2 is an exploded perspective view of an embodiment of the pressure regulator for vehicle fuel system in accordance with this invention; <25> Fig. 3 is a longitudinal section of the pressure regulator, illustrated in Fig. 2, in assembled status;

<26> Fig. 4 is a perspective view of the pressure regulator shown in Fig. 3; <27> Fig. 5 is a longitudinal section of a different embodiment of the valve member illustrated in Fig. 2; <28> Fig. 6 is an exploded perspective view of another embodiment of the pressure regulator for vehicle fuel system in accordance with this invention; <29> Fig. 7 is a longitudinal section of the pressure regulator, illustrated in Fig. 6, in assembled status; <30> Fig. 8 is a flow-characteristics curve of the pressure regulator shown in Fig. 6; <3i> Fig. 9 is a hysteresis-characteristics curve of the pressure regulator shown in Fig. 6; <32> Fig. 10 is a control-characteristics curve of the pressure regulator shown in Fig. 6; and, <33> Fig. 11 is a pressure-characteristics curve of the pressure regulator shown in Fig. 6, compared with the graph of a conventional pressure regulator.

[Mode for Invention] <34> An exemplary embodiment of this invention is described hereinbelow with reference to the annexed drawings. The Fig. 2 is an exploded perspective view of an embodiment of the pressure regulator for vehicle fuel system in accordance with this invention, Fig. 3 is a longitudinal section of the pressure regulator, illustrated in Fig. 2, in assembled status, and Fig. 4 is a perspective view of the pressure regulator shown in Fig. 3.

<35> Referring to Fig. 2, an embodiment of the pressure regulator for vehicle fuel system in accordance with this invention comprises a housing(50), a valve member(60), a disk member(70), an elastic member(80) and a cap(90), which are described in detail below.

<36> The housing(50) is shaped as a container can with a fuel inlet(50a) on one side. The inlet(50a) is preferably provided on the lower part of the housing(50) in parallel with the longitudinal axis of the housing(50), and also preferably, formed in a projecting cylindrical shape. The housing(50) is built-in with a cylindrical valve seat (52), which can be made separately and mounted inside the housing(50), as illustrated in the drawing or formed as an integrated part of the housing different from the drawing.

<37> The valve member(60) is formed as a single plate-shaped part without additional element, not in complicated configuration, as shown in the drawing.

<38> The disk member(70) is shaped like a thin-plate form, as shown in the drawing, and formed with fuel flow holes(70a), which can be formed as long lines, as illustrated, or as round holes.

<39> The said disk member(70) is preferably a metal plate spring formed with multiple fuel holes(70a) as illustrated in the drawing. Or differently, the disk member(70) can also be a rubber diaphragm formed with fuel holes(70a) which is not illustrated. However, a metal plate spring is preferred for the disk member(70) by virtue of its better durability, heat resistance, strength, and elasticity.

<40> The elastic member(80) is preferably a coil spring as illustrated in the drawing. The elastic member(80) is placed above the said disk member(70).

<4i> The cap(90) is formed with a fuel outlet(90a) as shown in the drawing. The fuel out let (90a) can be one or several. As illustrated, the fuel out lets(90a) are preferably formed with a large hole in the center of the cap(90) and several smaller holes along the circumference, to allow the fuel in the peripheral part flow smoothly, as well as that in the central part.

<42> In the Fig. 2, the parts indicated with number 56 is the curling part, 60a is a projection, and 60b is a stopper, which will be described later. The OR represents an 0-ring which is placed around the fuel inlet (50a) of the housing(50) to prevent fuel from leaking out of the inlet (50a). The part indicated with number 90 is flange on the bottom of the cap(90) which presses the upper side of the perimeter of the disk member(70).

<43> Now, referring to Fig. 3, the housing(50) is formed with a fuel diffusion chamber(54) outside of the valve seat(52) which is a space where fuel is distributed. The fuel diffusion chamber(54) is at the upper part of the housing(50) as the top of the housing is formed wider than the inlet (50a). Consequently, the fuel passed through the valve seat is diffused in the fuel diffusion chamber(54) and flows into the caρ(90).

<44> As shown in Fig. 2, the valve seat (52) is press-fit into the fuel inlet (50a) of the housing(50), and its outgoing end can be closed by the valve member(60).

<45> The valve member(60) is placed at the discharge end of the valve seat(52) to close or opens the valve seat(52) with its flat part, as illustrated in Fig. 2, by descending or ascending according to the pressure of the incoming fuel through the inlet(50a).

<46> As illustrated in the enlarged detail drawing "A" , the valve member(60) may be formed with embossments(62) on the flat part inside the valve seat (52). The embossments(62) diffuse the fuel flowing through the valve seat (52) toward the discharge end. Consequently, the pressure on the valve member(60) applied by the fuel is distributed across the area and the valve member(60) is lifted upward in balanced motion to open the valve seat (52) smoothly.

<47> In addition, as illustrated in the expanded detail drawing "A" , the valve member(60) may be formed with a groove(60c) which receives the end of the elastic member(80) to fix and hold the elastic member stably.

<48> As shown in Fig. 3, the valve member(60) is integrated with the disk member(70) by a fixing means, which can be implemented with; a project ion(60a) formed on the valve member(60) and penetrates the disk member; and, a stopper(δθb) which is jointed with the project ion(60a) to fix it with the disk member(70). In other words, the fixing means comprises a project ion(60a) and a stopper(60b) which is preferably a snap ring.

<49> In a different embodiment wherein the valve member(60) is made with rubber material, a metal disk member(70) can be inserted, as illustrated in the enlarged drawing "A" . In this case, the central part of the disk member(70) can be inserted to form an integrated part with the valve member(60).

<50> A part of the disk member(70) is joined to the valve member(60) and another part is joined with the housing(50). Consequently, the disk member(70) joins the valve member(60) to the housing(50) in the manner that the valve member(60) can move up and down.

<5i> The disk member(70) is joined with the housing(δθ) by a means, a preferred embodiment of which can be; curling(56) the end of the housing(50) meeting the cap(90) to hold tightly the end of the cap(50) and the circumference of the disk member(70) between the housing(δθ) and cap(90). Therefore, the curl(56) joins the housing(δθ) and cap(90) and fixes the circumference of the disk member(70) to the housing(δθ) by wrapping around the flange(90b) of the caρ(90) and pressing the circumference of the disk member(70) between the cap(90) and housing(50).

<52> If the disk member(70) is a metal plate spring, the setting pressure can be adjusted by processing a part of it with press brake machine.

<53> As shown in the enlarged drawing "B" , the disk member(70) is formed with multiple fuel pass holes(70a) which can be formed along the circumferential direction, leaving the connecting strips(72b) and circumferential margin(72c) when the fuel holes(70a) are cut off by press blanking process. As shown in the enlarged drawing, the connecting strips(72b) connect the central part of the disk member(70) with the circumferential margin(72c).

<54> In the disk member(70), the circumferential margin(72c) is subject to fatigue stress caused by repeated up/down movement of the valve member(60), which may lead to break-down of the connecting part(CP). To prevent this failure, it is preferred that the widths (Wl, W2) of the connecting parts(CP) should be wider than the width (W) of the connecting strips(72b) and circumferential margin(72c), to secure sufficient fatigue strength.

<55> As shown in the drawing, the elastic member((80) is enclosed in the cap(90) and arranged on the disk member(70). Therefore, the elastic member(80) virtually supports the disk member(70) elastically and provides pre-stress to the disk member(70). The valve member(60) closes the valve seat(52) with the pre-stress of the disk member(70), and descends back, when moved upward by the pressure of fuel, by the spring force of the elastic member(80).

<56> The cap(90) is joined with the top of the housing(50), as shown in the drawing, with the out let (90a) arranged in line to face the inlet(50a) of the housing(50) .

<57> In the Fig. 4, the housing(50) and the cap(90) is joined with the curling(56) .

<58>

<59> The functions and their effects of the members set forth and described hereinabove are described hereinbelow with reference to the drawings.

<60> As shown in Fig. 3, in the exemplary embodiment of the fuel pressure regulator for vehicles in accordance with this invention, the fuel inlet (50a) on the housing(50) is closed by the valve member(60) in normal condition, but opened when the pressure of fuel at the inlet (50a) becomes higher and pushes the valve member(60) with the disk member(70) upward against the spring force of the elastic member(80).

<6i> When the fuel inlet (50a) is open, fuel flows into the cap(90) virtually straight forward through the fuel holes(70a) of the disk member(70), as the inlet (50a) of the housing(50) and the out let (90a) of the cap(90) are aligned, and can be discharged out quickly. Therefore, the press regulator in accordance with this invention can respond quickly to the change of fuel pressure.

<62> If the fuel pressure is decreased, the valve member(60) is pushed downward by the spring force of the elastic member(80), precisely to the original position as the valve member(60) is joined with the disk member(70), closing the inlet (50a) of the housing(50) again.

<63> Fig. 5 is a longitudinal section of another embodiment of the valve member illustrated in the Fig. 2. As shown in Fig. 5, the valve member(50) can be formed with a convex which is inserted into and contacts tightly with the valve seat (52). In this configuration, the contact area between the valve member(60) and the valve seat(52) is enlarged, leading to increased sealing power .

<64> Fig. 6 to 11 show another exemplary embodiment of the fuel pressure regulator for vehicles in accordance with this invention, which is characterized by differently configured valve member(60) and disk member(70).

<65> This another exemplary embodiment of the fuel pressure regulator for vehicles in accordance with this invention is described in detail hereinbelow, with reference to the drawings.

<66> Fig. 6 is an exploded perspective view of another exemplary embodiment of the fuel pressure regulator for vehicles in accordance with this invention. Fig. 7 is a longitudinal section of the pressure regulator of Fig. 6 in assembled status. Fig. 8 shows the flow characteristics curve of the pressure regulator presented in Fig. 6. Fig. 9 shows the hysteresis characteristics of the pressure regulator presented in Fig. 6. Fig. 10 presents the control characteristics of the pressure regulator presented in Fig. 6. Fig. 11 shows the pressure characteristics of the pressure regulator presented in Fig. 6 in comparison with a conventional pressure regulator. In the description, the members whose functions and effects are same as those of the previous exemplary embodiment are not described for simplicity. <67> Referring to Fig. 6, the another exemplary embodiment of the fuel pressure regulator for vehicles in accordance with this invention employs a valve member(110) and a disk member(120) which are different from the valve member(60) and the disk member(70) in the previously described embodiment. These two members; the valve member(110) and a disk member(120) are the only difference, thus, will be described in detail hereinbelow.

<68> As shown in the drawings, the valve member(110) can be a ball valve(112) which closes the valve seat (52) by being plugged into the seat. The ball valve(112) is preferably made with metal which has good durability, and resistance against chemicals and corrosion. However, it can be made with non-metallic materials such as plastics, rubber, or ceramics.

<69> As illustrated, the disk member(120) has a concave(124) to meet with the upper part of the ball (112) of the valve member(110). Therefore, it is preferred that the concave(124) is shaped to meet with the shape of the upper part of the bal 1(112) as illustrated in the enlarged drawing " i " . In addition, the concave(124) is preferably located in the center of the disk member, as illustrated in the enlarged drawing " i " .

<70> The disk member(120) is formed with fuel holes(122), which can be long or circular shape, in the outskirt of the concave(124) .

<7i> In an embodiment employing said ball valve(112) for the valve member(llθ), as illustrated in the enlarged drawing "ii" , the valve seat(52) may be formed with taper(52a) on its inner surface. The taper(52a) is preferably shaped to meet with the contact surface of the ball valve(112), to allow more stable positioning of the ball on the valve seat (52) with the characteristics that the slope of the pressure curve to the flow rate changes according to the angle of the taper, as illustrated in the Fig. 8 and Fig. 9 which will be described later.

<72> In addition, the concave(124) of the disk member(120) may be formed with a flow hole(124a) as shown in the enlarged figure " i " , one at center, or alternatively one at the center and several additional holes around the center. <73> In the Fig. 7, the valve member(llθ) closes the valve seat(52) with a part of it being inserted into the concave(124) of the disk member(120). Here, as the valve member(llθ) is a ball valve(112), its lower part is inserted into and contacts with the valve seat (52).

<74> As described above, the valve member(llθ) closes and opens the valve seat (52), moving up and down by the pressure of the fuel. Because the valve member(llθ) is a ball valve(112), the fuel is distributed across the inside of the cap(90) when the valve is open. In particular, the fuel can flow into the cap(90) smoothly as the friction is minimized by ball-type configuration.

<75> The circumference of the disk member(120) is fixed to the housing(50) firmly by a fixing means, with the valve member(llθ) in the concave(124).

<76> The said fixing means is preferably provided at the interface between the cap(90) and housing(50), as illustrated in the drawing. The fixing means can be implemented with; the flange(90b) formed on the bottom of the cap(90) pressing the circumference of the disk member(120); and, said curling(56) formed on the top edge of the housing(50) which holds the flange(90b) and the circumference of the disk member(120). In summary, a fixing means can be constructed with the flange(90b) and cur1(56). In this configuration, the disk member(120) can be fixed firmly with the housing(50) and cap(90) inside the housing(50) without additional member.

<77> The housing(50) and the cap(90) is joined with the said curl(δβ) as shown in the enlarged drawing "iii" .

<78> In addition, the fuel pressure regulator in accordance with this invention can employ a noiseproof member which prevents the collision between the valve member(110) and the disk member(120) when the valve member(110) is in action. This noise proof member prevents noise by preventing the collision between the valve member(llθ) and the disk member(120).

<79> This noiseproof member can be a damping retainer(114) installed between the valve member(llθ) and the disk member(120), as shown in the enlarged drawing "iv" . The damping retainer(114) is preferably a thin ring on the top circumference of the valve member(llθ), and made of plastics or rubber material to absorb impact energy and prevent the shock and vibration of the valve member(110) from being transferred to the disk member(120).

<80>

<8i> In this exemplary embodiment of the fuel pressure regulator in accordance with the invention, the fuel inlet(50a) of the housing(50) is closed by the valve member(llθ) in normal condition, but opened when the fuel pressure becomes higher and moves the valve member(llθ) upward, together with the disk member(120), against the spring force of the elastic member(80).

<82> When the fuel inlet(50a) is open, fuel flows into the cap(90) virtually straight forward through the fuel hole(122) of the disk member(120), as the inlet(50a) of the housing(50 and the out let(90a) of the cap(90) are aligned, and can be discharged out quickly. Therefore, the press regulator in accordance with this invention can respond quickly to the change of fuel pressure.

<83> If the fuel pressure is decreased, the valve member(llθ) is pushed downward by the spring force of the elastic member(80), precisely to the original position as the valve member(110) is joined with the disk member(120), closing the inlet (50a) of the housing(50) again quickly.

<84> In addition, the valve member(110) implemented as a ball valve(112) can feed fuel more smoothly into the cap(90) due to the shape-characteristics of ball, further improving the responsiveness.

<85> In addition, the disk member(120) can hold the valve member(llθ) in the housing(50) stably, enabling up/down travel, since it the valve member(llθ) is inside the concave(124). In addition, the disk member(120) can feed fuel smoothly into the cap(90) through the fuel hole(122). In addition, the disk member(120) can also feed fuel into the cap(90) through the fuel hole(124a) formed in the concave(124). At this time, the fuel flowing through the fuel hole(124a) flows along on the inner surface of the concave(124) acting as lubricant between the concave(124) and the valve member(llθ) inside the concave(124), mitigating the friction between the two members when the valve member(110) is in action. <86> In Fig. 8, it can be seen that the another embodiment of the fuel pressure regulator in accordance with this invention shows almost constant level of pressure even in high flow rate. In other words, the pressure characteristics is within constant range (design range) regardless of the change in fuel pressure, which is a desirable performance for a pressure regulator.

<87> In Fig. 9, it can be seen that the another embodiment of the fuel pressure regulator in accordance with this invention shows almost constant level of hysteresis characteristics even when the pressure changes sharply. This shows that the pressure regulator in accordance with this invention provides reliable response to rapid changes in fuel pressure.

<88> In Fig. 10, it can be seen that the another embodiment of the fuel pressure regulator in accordance with this invention shows the control characteristics proportional to the flow rate. This shows that the pressure regulator in accordance with this invention provides excellent response to rapid changes in flow rate.

<89> In Fig. 11, in the another embodiment of the fuel pressure regulator in accordance with this invention, when the valve member (110) and valve seat (52) are in closed status, the amplitude of variation(B) of the pressure characteristics according to time, measured under the condition of maintaining fuel pressure, is smaller than that (A) of the conventional pressure regulators employing ball valves. This shows that the fuel pressure regulator in accordance with this invention has superior pressure characteristics to that of conventional pressure regulators.

<90> As described hereinabove, the another embodiment of the fuel pressure regulator in accordance with this invention can be easily embedded with the valve member(llθ) within housing(50) in movable condition, because a part of the valve member(llθ) is inserted in the concave(124) of the disk member(120)

<9i> In addition, if the valve member(llθ) is implemented as a ball valve(112), fuel can be fed into the cap(90) more smoothly because the shape of the ball valve(112) reduces friction of fuel flow and distributes the fuel flow evenly.

<92> In addition, the fuel holes (122) and (124a) formed in the disk member(120) enables smoother fuel flow into the cap(90).

<93>

[Industrial Applicability]

<94> As described hereinabove, the fuel pressure regulator for vehicles in accordance with this invention can save manufacturing cost due to its simplified structure of the valve member. Fuel flow is straightforward because! the disk member retains the valve member while allowing it to move up and down and to let fuel flow through fuel holes; and, the fuel inlet and outlet formed on the housing and cap maintain aligned positions.

<95> In addition, if the disk member is implemented with a metal plate spring formed with fuel holes, long service life is guaranteed by high endurance and the setting pressure of the disk member can be controlled by blanking a part of the disk member.

<96> In addition, by implementing the disk member as a plate spring formed with multiple fuel holes and the joints between connecting strips and circumference of the disk having wider width than those of the connecting strip and circumference, failure in the joint by fatigue stress caused by upward and downward movement can be prevented.

<97> In addition, the disk member can be easily joined with the valve member using a projection and snap ring, and the valve member can be joined with the housing easily and firmly by forming a curl with the perimeter edge of the housing.

<98> In addition, in the another exemplary embodiment of the pressure regulator in accordance with this invention, wherein the disk member is formed with a concave which receives a part of the valve member, the valve member can be easily installed in the housing maintaining the ability of moving up and down.

<99>

<ioo> In addition, by implementing the valve member as a ball valve, the friction of fuel flow can be reduced and fuel flow can be distributed due to the spherical shape of the ball, resulting in smoother fuel feed into cap.

<ioi> In addition, by forming fuel hole or holes on the said concave of the disk member, fuel flow into cap becomes easier.

<iO2> While it is apparent that the illustrative embodiments of the invention herein disclosed fulfills the objective stated above, it will be appreciated that numerous modifications and other embodiments may be devised by those skilled in the art. Therefore, it will be understood that the appended claims are intended to cover all such modifications and embodiments which come within the spirit and scope of the present invention.

Claims

[CLAIMS] [Claim 1] <io4> A fuel pressure regulator for fuel system of vehicle, which can regulate pressure in the fuel system in accordance with the pressure of fuel, which is characterized by being comprised of; <iO5> a can-shaped housing formed with a fuel inlet (50a) on one side and a valve seat (52) inside; <iO6> a valve member which is placed on the valve seat(52) of the housing(50) to open and close the valve seat (52) according to the pressure of the fuel flowing through the valve seat; <1O7> a thin disk member one part of which is fixed with said valve member and the another part is fixed with said housing(50) to hold the valve member while allowing it to move upward or downward, and formed with fuel holes(70a) for fuel flow; <i08> a fixing means which fixes a part of the disk member to said valve member ; <iO9> a fixing means which fixes another part of the disk member to said housing(50) ; <iio> an elastic member(80) which elastically supports the disk member, which is fixed to said valve member and housing, to provide the disk member with preliminary stress! and, <iπ> a cap which encloses the elastic member(80) and integrated with said housing(50), and formed with a fuel out let (90a) on the opposite side of the inlet(50a) of said housing. (50) for feeding fuel outside. [Claim 2] <ii2> The fuel pressure regulator for fuel system of vehicle of Claim 1, wherein said disk member is characterized by being a metal plate spring formed with at least one fuel hole(70a). [Claim 3] <ii3> The fuel pressure regulator for fuel system of vehicle of Claim 2, wherein said plate spring is characterized by being formed with; <ii4> said fuel holes(70a) formed in multiple numbers like a long strip along the circumferential direction; and connecting strips(72b) between the central part and the circumference(72c); and, the widths(Wl, W2) of the joint between the connecting strips(72b) and the circumference(72c) are larger that those(W) of the connecting strips(72b) and the circumference(72c). [Claim 4]

<ii5> The fuel pressure regulator for fuel system of vehicle of Claim 1, wherein one of the said fixing means comprises!

<ii6> a project ion(60a) formed on a part of said valve member(60) and penetrates said disk member; and,

<ii7> a stopper(60b) which is joined with the project ion(ΘOa) protruding from the disk member to retain the project ion(60a) to the disk member. [Claim 5]

<ii8> The fuel pressure regulator for fuel system of vehicle of Claim 1, wherein the other one of the said fixing means is characterized by being a curling(56) which is formed at the edge of the housing(50) wrapping and fixing the edge of the cap(70) and the edge of the disk member, which is inserted between the housing(50) and the cap(70) to the housing(50). [Claim 6]

<ii9> The fuel pressure regulator for fuel system of vehicle of Claim 1, wherein said valve member is characterized by being a plate, formed with a convex which fits with the inner circumference of the valve seat(52) to increase the contact area between the valve member and valve seat(52). [Claim 7]

<i20> The fuel pressure regulator for fuel system of vehicle of Claim 1, wherein said valve member is characterized by being a ball-type valve(112), a part of which is inserted inside the valve seat (52) to close the valve seat (52). [Claim 8)

<i2i> The fuel pressure regulator for fuel system of vehicle of Claim 1, wherein said disk member is formed with a concave(124) to receive a part of said valve member(110). [Claim 9]

<122> The fuel pressure regulator for fuel system of vehicle of Claim 8, wherein said disk member is formed with a fuel flow hole(124a) in the said concave. [Claim 10]

<i23> The fuel pressure regulator for fuel system of vehicle of Claim 1 through to Claim 9, wherein the valve member(110) and disk member(120) are provided with a noiseproof member to prevent noise by preventing the collision between the two members, and the noiseproof member is characterized by being a damping retainer(114) which buffers the impact energy generated by the rapid contacting of the valve member(llθ) and disk member(120).