JP2004027964A - Fuel supply device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device for a vehicle capable of reducing the pulsation of fuel supplying pressure with an inexpensive and simple constitution without increasing a loading space. <P>SOLUTION: In this fuel supply device for the vehicle wherein an injector is mounted on a delivery member having a fuel supply channel, in a state of being allowed to communicate with the fuel supply channel, an orifice member forming an orifice independently of the delivery member, is engaged between the fuel supply channel and the injector. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle fuel supply device in which an injector is mounted on a delivery member that supplies fuel to a vehicle internal combustion engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a fuel supply device for an internal combustion engine in which an injector is mounted on a delivery member that supplies fuel to a vehicle internal combustion engine is disclosed in JP-A-2000-8994. In this prior art, as shown in FIG. 4, in a fuel delivery device (fuel supply device) in which an injector 106 is attached to a delivery member 107 having a fuel supply passage 117 in communication with the fuel supply passage 117, the fuel supply passage 117 is provided. A volume section 120 for storing an appropriate volume of fuel is provided in a communication path between the fuel cell and the injector 106, and the volume section 120 and the fuel supply path 117 are communicated with each other by a narrow path 121. With a low-cost configuration in which the delivery member 107 is provided with a volume 120 separately from the fuel supply passage 117 and communicates with the narrow passage 121, the pressure fluctuation caused by the opening of the injector is attenuated by the volume 120 and the narrow passage 121. Thus, there is disclosed that the influence on the fuel supply pressure in the fuel supply passage can be reduced.
[0003]
[Problems to be solved by the invention]
However, the above technique has the following problems. In the above-described known technique, since the structure is newly provided with the volume section 120, there is a problem that the fuel supply device becomes large and the mountability deteriorates. In particular, in recent years, due to the mounting of auxiliary equipment accompanying the sophistication of the engine for vehicles, restrictions on the space of the equipment mounted in the engine room have become more severe. In addition, the orifice (small passage 121) provided in the fuel supply device is generally machined by cutting. However, it is difficult to remove burrs generated when machining the orifice. However, if it is separated and bites as a foreign substance in the valve portion of the fuel injection valve, a malfunction may occur.
[0004]
Therefore, the present invention has been made in view of the above problems, and in a vehicle fuel supply device, it is possible to reduce the pulsation of the fuel supply pressure with an inexpensive and simple configuration without increasing the mounting space. It is a technical object to provide a structure of a fuel supply device for a vehicle.
[0005]
[Means for Solving the Problems]
The technical means of claim 1 taken to solve the above-mentioned problem is as follows:
A fuel supply device for a vehicle in which a delivery member having a fuel supply passage is connected to the fuel supply passage and an injector is mounted.
An orifice member having an orifice formed separately from the delivery member is mounted between the fuel supply passage and the injector.
[0006]
In the conventional fuel supply device, as described above, in the related art, the orifice is formed directly in the delivery member, and therefore, the pulsation generated in the delivery member is directly transmitted to the delivery member. In order to solve the above problem, by forming the orifice portion with an orifice member different from the delivery member, the pulsation does not directly propagate to the orifice, but interferes between the delivery member and the orifice member to reduce the pulsation. Propagation of vibration noise due to pulsation can also be reduced by engaging an orifice member separate from the delivery member between the fuel supply passage and the injector.
[0007]
Still further, the technical means of claim 2 is as follows.
The orifice member is a vehicle fuel supply device that is an elastic member.
[0008]
The orifice member is constituted by a member different from the delivery member as described in claim 1. Since the orifice member is formed of an elastic member, the orifice member can be deformed with respect to the pulsation propagating in the fuel supply device, so that the pulsation is absorbed and reduced, and the effect of reducing the vibration noise generated at the time of the pulsation is provided. It becomes possible.
[0009]
The technical means of claim 3 further comprises:
The orifice member is a vehicle fuel supply device made of fluororesin or fluororubber.
[0010]
Since the orifice member made of an elastic member is made of a fluorine resin or a fluorine synthetic resin, it is possible to have performance in a predetermined environment.
[0011]
The technical means of claim 4 further comprises:
The orifice member is a vehicular fuel supply device having a projection formed on an inner peripheral surface of the orifice.
[0012]
A projection is provided on the inner peripheral surface of the orifice of the orifice member formed separately from the delivery member, so that when the fuel passes through the orifice, the pulsation energy is generated by the resistance passing through the projection and the frictional energy. (Such as heat), so pulsation can be suppressed.
[0013]
And the technical means of claim 5 is:
The projecting portion is a fuel supply device for a vehicle having a substantially hemispherical shape or a shape in which a substantially circular plate is perforated.
[0014]
The protruding portion provided on the orifice member has a substantially hemispherical shape so that the flow of the fuel does not easily become turbulent, or a shape in which a hole is formed in a substantially circular plate. Since the orifice member is formed of an elastic member, the pulsation can be reduced by the deformation of the orifice member due to the pulsation. At the same time, since the orifice member is formed of an elastic member, it is possible to reduce vibration noise generated during pulsation.
[0015]
And the technical means of claim 6 is:
The orifice member is processed by any one of an injection molding method, an extrusion molding method, a pressure molding method, a sinter molding method, or a mold molding method, a compression molding method, or a baking method. The fuel supply device for a vehicle according to any one of claims 2 to 4, wherein the fuel supply device is processed by any one of the following methods.
[0016]
The orifice member is formed by any of the molding methods described above. Since the orifice of the orifice member can be formed without using the above-described cutting, the degree of freedom in the processing shape of the orifice regulated by the cutting can be improved. In addition, it is possible to abolish processes such as cleaning for removing foreign matter and burrs generated during cutting.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing a state in which an orifice member 3 is mounted on a delivery member 1 in a vehicle fuel supply device of the present invention. A fuel passage 6 formed in the delivery pipe 2 of the delivery member 1 is connected to a fuel pump (not shown), and fuel in a fuel tank (not shown) is discharged from the pump (not shown) and sent to the delivery pipe 2 under pressure. The delivery member 1 which is the main body of the delivery pipe 2 has a plurality of mounting holes 4 for the injectors, and the injectors 5 are arranged and mounted. The opening and closing operation of the injector 5 is controlled by a control unit (not shown) at a timing according to the operation state of the engine.
[0018]
FIG. 2 is a schematic cross-sectional view showing a state where the orifice member 3 in the AA cross section of FIG. As shown in FIG. 2, the delivery member 1 is closed to a cylinder head 9 by a mounting bolt 8. At the lower part of the orifice member 3 shown in FIG. 2, a mounting hole 4 for mounting the injector 5 is formed, and the injector 5 is mounted. An orifice member 3 formed of a member different from the delivery member 1 is attached to the lower surface of the fuel passage 6 of the delivery pipe 2 shown in FIG. Although FIG. 2 schematically shows a state in which the orifice member is mounted, the orifice member 3 is locked so that the orifice member 3 does not fall off from the delivery member 1 in design. Since the orifice member 3 has a structure sandwiched between the delivery member 1 and the injector 5, it can be easily fixed at a predetermined position. Further, since the orifice member 3 is brought into contact with the injector 5, a damper effect capable of reducing the operation noise of the injector 5 can be expected. The orifice member 3 is devised so as to reduce fuel pulsation for the vehicle and to stably perform high-precision fuel injection. For this purpose, the orifice member 3 is made of a member that withstands the worst environmental temperature during operation of the engine with respect to general operation of the engine.
[0019]
The orifice member 3 in contact with the delivery pipe 2 is made of fluororesin or fluororubber to satisfy the above conditions. Examples of the fluorine resin include tetrafluoroethylene resin (PTFE), ethylene tetrafluoride-perfluoroalkoxy-ethylene copolymer resin (PFA), ethylene tetrafluoride-propylene hexafluoropropylene copolymer resin (FEP), and ethylene-tetrafluoroethylene. Fluoroethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), and polyvinyl fluoride (PVF) are candidate materials. Examples of the fluororubber include vinylidene fluoride (FKM), tetrafluoroethylene-propylene (FEPM), and tetrafluoroethylene-barfluorovinyl ether (FFKM). Further, a fluorine elastomer may be used. Nitrile rubber (NBR), acrylic rubber (ACM / ANM), (CHR), urethane rubber (U), epichlorohydrin rubber (CHR) can be used depending on the conditions in place of the above fluororubber. Any material is selected in consideration of design considerations such as an optimum manufacturing method, cost, and performance according to the shape of the orifice member 3. The orifice member 3 may have a heat resistance of generally 100 ° C. at high temperatures in an operating environment near the orifice 7, but may have a heat resistance of 120 ° C. to 130 ° C. or more in consideration of material deterioration. It consists of. As for the low temperature, the orifice member 3 may be formed by sinter molding using a sintered metal containing the above resin or rubber as long as the material satisfies the required characteristics of the vehicle at the storage temperature in winter.
[0020]
In general, for molding of a fluororesin with a fluororesin, a pressure molding method of molding from a powder resin is used. In addition, in the case of a trifluoride resin having slightly inferior heat resistance, it may be manufactured by injection molding or extrusion molding, which is a general method of resin. As the method of forming the fluororubber, a method such as die molding, compression molding, or baking is used.
[0021]
FIGS. 3A and 3B show another embodiment in which a projection is formed on the inner peripheral surface of the orifice 7 of the orifice member 3. In the prior art, the orifice provided in the delivery member 1 has a long hole of approximately 2 mm or less formed by cutting. In the present invention, instead of this, a hemispherical projection may be provided by a molding method as shown in FIG. 3A, or a valve-shaped projection may be provided as shown in FIG. 3B. The shape of these projections is not limited to the above example, and is designed to be optimal for pulsation in consideration of the orifice characteristics. Therefore, the smoother the surface roughness of the projection is, the more effective the pulsation is. In any case, since the orifice member 3 is formed of an elastic member, the orifice member 3 is deformed in response to pulsation, and pulsation is reduced. In the case where a projection is formed on the inner peripheral surface of the orifice 7, and when the orifice 7 is formed by cutting as in the conventional configuration, it is very difficult to attach the projection described above. Since it is formed of an elastic member such as rubber or rubber, the projection shape can be easily formed. Further, when the orifice 7 is formed by cutting, it is very difficult to attach the above-described valve. However, in the present invention, since the orifice member 3 is formed of an elastic member such as resin or rubber, the valve shape is also reduced. Any shape can be easily formed.
[0022]
【The invention's effect】
According to the present invention, as described above, in the conventional fuel supply device, the orifice is formed directly on the delivery member, but the orifice member is formed by using an orifice member different from the delivery member. The fuel pulsation in the delivery pipe 2 is reduced by the synergistic effect of the pressure and the orifice. In addition, propagation of vibration noise due to pulsation can be reduced by engaging an orifice member separate from the delivery member between the fuel supply passage and the injector. Since the orifice member is made of an elastic member, its shape can be deformed in response to the pulsation propagating in the fuel supply device, so it is possible to absorb the pulsation and reduce the vibration noise generated during the pulsation. It becomes. Since the orifice member is made of fluororesin or fluororubber, it is possible to have performance in a predetermined environment. Since the orifice member is formed as a member separate from the delivery member, the delivery member can be shared by merely preparing an original orifice member corresponding to the fuel supply amount. Also, in the conventional processing of the delivery member, when the orifice was defective during processing, the entire delivery member was defective. Therefore, cost can be reduced.
[0023]
Further, since the projection is provided on the inner peripheral surface of the orifice, when fuel passes through the orifice, the fuel is converted into frictional energy (heat, etc.) by resistance passing through the projection, so that pulsation can be suppressed. The orifice member is formed in a substantially hemispherical shape so that the flow of the fuel does not easily become turbulent, or a shape in which a hole is formed in a substantially circular plate, but the orifice member is an elastic member. Since the orifice member is deformed by the pulsation, the pulsation can be reduced. At the same time, since the orifice member is formed of an elastic member, it is possible to reduce vibration noise generated during pulsation. The orifice member is formed by a molding method. Since the orifice of the orifice member can be formed without using machining by cutting as in the prior art, the degree of freedom in the machining shape of the orifice regulated by cutting can be improved. In addition, it is possible to abolish processes such as cleaning for removing foreign matter and burrs generated during cutting. Therefore, the present technology is a structure of a fuel supply device for a vehicle that can reduce the pulsation of the fuel supply pressure with an inexpensive and simple configuration without increasing the mounting space as compared with the conventional technology, and has a great effect.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a vehicle fuel supply device according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing an orifice member of the vehicular fuel supply device in an AA cross section in FIG. 1;
FIG. 3 is a schematic sectional view showing an example of a projection on the inner peripheral surface of the orifice of the present invention.
FIG. 4 is a schematic sectional view of a vehicular fuel supply device showing an example of a known technique.
[Explanation of symbols]
1: Delivery member 2: Delivery pipe 3: Orifice member 4: Injector mounting hole 5: Injector 6: Fuel passage 7: Orifice 8: Mounting bolt 9: Cylinder head 10: Projection

Claims (6)

A fuel supply device for a vehicle in which a delivery member having a fuel supply passage is connected to the fuel supply passage and an injector is mounted.
An orifice member having an orifice formed separately from the delivery member is mounted between the fuel supply passage and the injector. The vehicle fuel supply device according to claim 1, wherein the orifice member is an elastic member. 3. The fuel supply device for a vehicle according to claim 1, wherein the orifice member is made of a fluorine resin or a fluorine rubber. 4. The vehicle fuel supply device according to claim 1, wherein the orifice member has a protrusion formed on an inner peripheral surface of the orifice. 5. The fuel supply device for a vehicle according to claim 4, wherein the protrusion has a substantially hemispherical shape or a shape formed by drilling a hole in a substantially circular plate. The orifice member is processed by any one of an injection molding method, an extrusion molding method, a pressure molding method, a sintering molding method, or a die molding method, a compression molding method, or a baking method. The fuel supply device for a vehicle according to any one of claims 2 to 4, wherein the fuel supply device is processed by any one of the following methods.

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