WO2017134997A1

WO2017134997A1 - Fuel pressure regulator and fuel supply module

Info

Publication number: WO2017134997A1
Application number: PCT/JP2017/000757
Authority: WO
Inventors: 田中　聡
Original assignee: 株式会社ケーヒン
Priority date: 2016-02-02
Filing date: 2017-01-12
Publication date: 2017-08-10
Also published as: CN108603471B; JP2017137796A; CN108603471A; JP6169200B1

Abstract

A fuel pressure regulator provided with, inside a casing, a high-pressure chamber into which high-pressure fuel can be introduced, a fuel discharge port for discharging the high-pressure fuel introduced into the high-pressure chamber, a low-pressure chamber made to be in communication with the interior of a fuel tank, and a pressure regulation valve capable of regulating the pressure of the fuel in the high-pressure chamber, wherein the pressure regulation valve (V) is provided with at least a valve housing (Vh) fluid-tightly fitted in a receiving hole (M) provided to the casing (C) so that the high-pressure chamber (H) and the low-pressure chamber (L) are in communication with each other, and a valve element (Vv) accommodated inside the valve housing (Vh) and capable of opening/blocking the path between the high-pressure chamber (H) and the low-pressure chamber (L), and the low-pressure chamber (L) includes at least an annular space (Lo) extending to the periphery of the high-pressure chamber (H) and the receiving hole (M) so as to encircle the high-pressure chamber (H) and the receiving hole (M). The peripheral wall of the high-pressure chamber in the casing is thereby protected from impact by loose rocks and the like, and operating noises of the pressure regulation valve and other components are not likely to leak to the exterior.

Description

Fuel pressure regulator and fuel supply module

The present invention relates to a fuel pressure adjusting body in which a pressure regulating valve capable of adjusting fuel pressure is built in a casing, and further to a fuel supply module in which such a fuel pressure adjusting body and a fuel pump unit are combined.

As the fuel pressure regulator, for example, a high pressure chamber capable of introducing high pressure fuel into the casing, a fuel discharge port for discharging the high pressure fuel introduced into the high pressure chamber, and a low pressure chamber communicated with the fuel tank, A structure having a regulator valve (pressure regulating valve) that leaks fuel from the high pressure chamber to the low pressure chamber in response to an excessive increase in the fuel pressure in the high pressure chamber is conventionally known as disclosed in Patent Document 1, for example. is there.

Japanese Unexamined Patent Publication No. 2004-137936

In the conventional fuel pressure regulator, the outer wall portion of the casing is formed so as to directly surround the high-pressure chamber, so that the outer wall portion (that is, the peripheral wall of the high-pressure chamber) receives a large external force or collides with a stepping stone or the like. If it is damaged, there is a risk of sudden fuel spillage from the high pressure chamber. In addition, since the pressure regulating valve as well as the high pressure chamber is also directly surrounded by the outer wall portion of the casing, the operating noise of the pressure regulating valve and the pump operating noise propagating from the fuel pump to the high pressure chamber side are affected by the outer wall portion of the casing. There was also a problem that it was easy to leak outside.

The present invention has been made in view of such circumstances, and an object thereof is to provide a fuel pressure adjusting body capable of solving the above problem with a simple structure, and a fuel supply module incorporating the fuel pressure adjusting body. .

In order to achieve the above object, the present invention provides a casing having a high pressure chamber into which high pressure fuel can be introduced, a fuel discharge port for discharging high pressure fuel introduced into the high pressure chamber, and a fuel tank. And a pressure regulating valve capable of adjusting the fuel pressure in the high pressure chamber, wherein the pressure regulating valve is provided in the casing so as to communicate between the high pressure chamber and the low pressure chamber. A valve housing that is liquid-tightly fitted in the hole, and a valve body that is housed in the valve housing and is capable of conducting and blocking between the high-pressure chamber and the low-pressure chamber, and the low-pressure chamber includes the high-pressure chamber And at least a high-pressure chamber and an annular space extending around the receiving hole so as to surround the receiving hole.

According to the present invention, in addition to the first feature, at least portions of the casing surrounding the annular space portion and the receiving hole are integrally formed, and the annular space portion and the receiving hole are formed on the molding surface. The annular space and the receiving hole are characterized in that their central axes coincide with each other or are parallel to each other.

According to the present invention, in addition to the second feature, the integral molding is injection molding using a synthetic resin, and the third feature is that at least a discharge cylinder portion of the high-pressure fuel of the fuel pump unit is insert-molded. And

According to the present invention, in addition to the third feature, the high-pressure chamber is disposed adjacent to the receiving hole on the same axis, and an inner wall portion of the casing surrounding the high-pressure chamber is an inner wall portion of the casing. A fourth feature is that the end surface opposite to the receiving hole is in close contact with at least a part of the tip surface of the discharge cylinder portion over the entire circumference.

According to the present invention, in addition to the fourth feature described above, the synthetic resin casing is integrally formed with a coupler cylindrical portion constituting a coupler together with a coupler terminal connected to the power receiving portion of the fuel pump unit. In the integral molding, at least a part of the power receiving unit and the coupler terminal is insert-molded, and the coupler terminal is exposed in a communication hole connected to the low pressure chamber in the wall of the casing. This is the fifth feature.

According to the sixth aspect of the present invention, in addition to the fifth feature, the communication hole that opens in the annular space portion of the low-pressure chamber and the receiving hole have a center axis that is substantially parallel to the sixth hole. Features.

The present invention is also a fuel supply module including a fuel pressure adjusting body having any one of the fourth to sixth features and the fuel pump unit fixed to the casing. A seventh feature is that at least a part of a deaeration passage communicating with the deaeration port of the fuel pump unit and the other end communicating with the annular space is provided.

According to the first feature of the present invention, the low pressure chambers provided in the casing of the fuel pressure regulator and communicating with the fuel tank surround the high pressure chamber of the casing and the receiving hole of the pressure regulating valve. And an annular space extending around the receiving hole, it is possible to effectively protect the peripheral wall of the high pressure chamber of the casing from an impact such as an external force or a stepping stone. A situation in which the peripheral wall is damaged and sudden fuel leakage from the high pressure chamber occurs can be effectively prevented. Moreover, since the annular space portion of the low pressure chamber surrounds the high pressure chamber and the receiving hole, the operating sound of the pressure regulating valve in the receiving hole and the pump operating sound propagating from the fuel pump unit to the high pressure chamber side can be effectively sound-insulated, It is possible to effectively suppress these operating sounds from leaking through the casing.

In particular, according to the second feature, at least portions of the casing surrounding the annular space portion and the receiving hole are integrally formed, and the annular space portion and the receiving hole are defined by the molding surface. The receiving holes have their central axes coincident with each other or substantially parallel to each other. Therefore, in manufacturing a casing having several spaces (ie, a low pressure chamber and a receiving hole) for shielding fuel, a sealing material and a number of walls are used. There is no need to assemble the casing by assembling the materials, and the casing can be manufactured efficiently and inexpensively while ensuring the liquid-tightness of the fuel. In addition, the receiving hole and the low-pressure chamber can be simultaneously and easily formed with a single mold pin when the casing is integrally formed, which can contribute to an improvement in production efficiency.

In particular, according to the third feature, the integral molding is resin molding, and at least the discharge cylinder portion of the high-pressure fuel is insert-molded in the fuel pump unit, so that the fuel pressure can be adjusted without specially using a seal member. Sufficient liquid-tightness between the body and the fuel pump unit can be ensured. Further, the process of assembling the fuel pressure adjusting body and the fuel pump unit together can be simplified.

Further, particularly according to the fourth feature, the high pressure chamber is disposed adjacent to the receiving hole on the same axis, and the inner wall portion of the casing surrounding the high pressure chamber is an end surface of the inner wall portion opposite to the receiving hole. Is closely attached to at least a part of the front end surface of the discharge cylinder part over the entire circumference, so that not only the receiving hole and the low pressure chamber but also the high pressure chamber can be simultaneously used with a single mold pin when the resin molding of the casing is performed. In addition, it can be easily molded, and the discharge cylinder portion of the fuel pump unit and the casing can be sealed at the same time, thereby further improving the production efficiency.

In particular, according to the fifth feature, the coupler can be integrated into the casing simultaneously with the resin molding of the casing, so that the cost can be reduced. In addition, since the coupler terminal, part of which is insert-molded together with the casing, is exposed in the communication hole in the casing wall and connected to the low pressure chamber, the high pressure fuel in the fuel pump unit is coupled to the coupler terminal and the casing (resin). Even if it tries to leak to the outside through the boundary surface, fuel leaked from the boundary surface is led to the low pressure chamber (and hence the fuel tank) through the communication hole, thereby effectively preventing fuel leakage to the outside. Is possible.

In particular, according to the sixth feature, the communication hole that opens in the annular space portion of the low-pressure chamber and the receiving hole have a substantially parallel central axis, so that a single mold is formed during resin molding of the casing. The receiving hole, the low-pressure chamber and the communication hole can be simultaneously and easily formed with a pin, which can contribute to further improvement in production efficiency.

In particular, according to the seventh feature, the casing is provided with a deaeration passage having one end communicating with the deaeration port of the fuel pump unit and the other end communicating with the annular space portion. It is possible to deaerate the fuel pump unit using the fuel flow path (low pressure chamber) that is returned to the chamber, eliminating the need for dedicated external piping for deaeration and contributing to simplification and downsizing of the structure. Can do. In addition, since the deaeration passage communicates with the low-pressure chamber, in particular, the annular space extending annularly around the receiving hole, the degree of freedom in the layout of the deaeration passage is increased, and the deaeration passage can be easily arranged.

FIG. 1 is an overall vertical cross-sectional view (cross-sectional view taken along line 1-1 of FIG. 2) of a fuel supply module showing a first embodiment of the present invention. (First embodiment) FIG. 2 is a cross-sectional view of the main part of the fuel supply module (cross-sectional view taken along line 2-2 in FIG. 1). (First embodiment) FIG. 3 is a sectional view corresponding to FIG. 1 and a partially enlarged view for explaining a molding process of the casing body of the fuel supply module. (First embodiment) FIG. 4 is an overall longitudinal sectional view (corresponding to FIG. 1) and a partially enlarged view of a fuel supply module showing a second embodiment of the present invention. (Second Embodiment)

A ··· Fuel pressure regulator C ··· Casing Cmi ··· Inner wall portion (portion surrounding casing receiving hole)
Cmie: End surface of the inner wall portion opposite to the receiving chamber Cmo: Outer wall portion (a portion surrounding the annular space portion of the casing)
CP ... Coupler CPc ... Coupler cylinder part CPt ... Coupler terminal FM ... Fuel supply module H ... High pressure chamber L ... Low pressure chamber Lo・・・・・ Ring space M ・・・・・・ Reception hole V ・・・・・・ Regulator valve (pressure regulating valve)
Vh, valve housing Vv, valve body U, fuel pump unit 2a, discharge cylinder 2ae, tip end surface 2d of discharge cylinder, ..Deaeration port 10 ... Conductive connection member (power receiving part)
12 ... discharge pipe (fuel discharge port)
15 ... Communication hole 20 ... Deaeration passage

Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

First embodiment

A first embodiment of the present invention will be described with reference to FIGS. An internal combustion engine mounted on a traveling vehicle is provided with a fuel injection valve F as a fuel injection device. The fuel conduit 1 connecting the fuel injection valve F and the fuel tank T is connected to the fuel tank T. A fuel supply module FM is provided which sucks and pressurizes fuel from the inside and supplies the fuel to the fuel injection valve F.

The fuel supply module FM is configured by combining and integrating a fuel pump unit U and a fuel pressure adjusting body A that adjusts the pressure of the fuel discharged from the fuel pump unit U so as not to increase excessively. The fuel pump unit U is a unit unit in which a fuel pump (not shown) and an electric motor that drives the fuel pump unit U are collectively sealed and housed in a single unit case 2, and its structure has been conventionally known. Further, since it is not the gist of the present invention, a specific description is omitted.

First, the fuel pressure adjusting body A will be described. The fuel pressure adjusting body A includes a high pressure chamber H into which high pressure fuel can be introduced, a low pressure chamber L communicating with the fuel tank T, and a fuel pressure in the high pressure chamber H exceeding a predetermined value. And a regulator valve V as a pressure regulating valve that adjusts the fuel pressure in the high-pressure chamber H to a predetermined value or less by leaking fuel from the high-pressure chamber H to the low-pressure chamber L according to the above.

The casing C includes a casing body Cm having a generally bottomed cylindrical shape, and a cover body Ca that is integrally and liquid-tightly coupled to the open end of the casing body Cm and covers the open end surface. The means for joining the cover body Ca to the casing body Cm is arbitrary, and for example, welding means, adhesion means, screwing means, etc. can be implemented. A drain pipe portion 3 projects from the outer surface of the cover body Ca, and a drain pipe 4 communicating with the inside of the fuel tank T is connected to the drain pipe portion 3.

A low pressure chamber L is defined between the opposing surfaces of the casing body Cm and the cover body Ca. The low-pressure chamber L includes a flat disk-like base space Lb facing the inner surface of the cover body Ca, and a cylindrical annular space Lo that communicates directly with the outer periphery of the base space Lb. The annular space Lo is defined by the inner surface of an annular recess formed by recessing a part of the surface of the casing body Cm facing the cover body Ca.

The casing main body Cm has a columnar receiving hole M that directly communicates with the center of the base space Lb, and the receiving hole M is arranged in tandem on the same axis (that is, the central axis of the casing C) and directly into the receiving hole M. A communicating high-pressure chamber H is formed. Thus, the annular space Lo of the low pressure chamber L extends around the high pressure chamber H and the receiving hole M so as to concentrically surround the high pressure chamber H and the receiving hole M.

The regulator valve V includes a valve housing Vh that is fluid-tightly fitted to the peripheral wall of the receiving hole M (that is, via a seal member), a valve body Vv that can open and close the valve hole 5 provided in the valve housing Vh, And a valve spring Vs that repels the body Vv in the valve closing direction (rightward in FIG. 1).

The valve housing Vh supports the fixed end of the valve spring Vs by fitting the valve housing body Vhm, which is formed so that the valve hole 5 communicates between the high pressure chamber H and the low pressure chamber L, and the valve housing body Vhm. And a bottomed cylindrical spring receiver Vhs.

In the valve housing body Vhm, a valve seat 6 is formed at the opening edge of the valve hole 5 on the low pressure chamber L side. In this embodiment, a valve ball is employed as the valve body Vv seated on the valve seat 6 so as to be able to contact and separate. In addition, the valve body Vv of this invention is not limited to this embodiment, For example, you may use a poppet-like valve body.

Further, a valve rod 8 extending toward the low pressure chamber L is fixed (or formed integrally) to the valve body Vv, and the movable end of the valve spring Vs is supported by the large-diameter base portion of the operating rod 8. The small diameter tip of the valve rod 8 faces the drain pipe 3 on the outer surface of the cover body Ca.

Thus, the valve body Vv is normally held at the valve closing position (that is, the seating position with respect to the valve seat 6) by the elastic force of the valve spring Vs, and the fuel pressure in the high pressure chamber H exceeds the predetermined valve opening pressure. In response to the increase, the valve opens so as to move away from the valve seat 6 against the valve spring Vs. By this valve opening operation, the high pressure chamber H and the low pressure chamber L communicate with each other, and a part of the high pressure fuel in the high pressure chamber H leaks to the low pressure chamber L side, and then escapes to the fuel tank T side through the drain pipe 3. . As a result, the fuel pressure in the high-pressure chamber H (that is, the fuel pressure discharged from the fuel pump unit U) is adjusted to a predetermined value or less.

By the way, the casing main body Cm includes at least a substantially cylindrical outer wall portion Cmo surrounding the annular space Lo and a substantially cylindrical inner wall portion Cmi surrounding the receiving hole M and the high pressure chamber H, in addition to the casing main body Cm. It is integrally formed with this part. And the low pressure chamber L (especially substantially all of the annular space Lo and a part of the base space Lb), the receiving hole M, and the high pressure chamber H are defined by the molding surface. The annular space Lo having a substantially cylindrical shape of the low-pressure chamber L, the receiving hole M and the high-pressure chamber H having a stepped columnar shape have their center axes aligned with each other or substantially parallel to each other.

Further, a suction pipe portion 11 is integrally provided at the end of the casing main body Cm opposite to the regulator valve V (right side in FIG. 1), and the inner end of the suction pipe portion 11 is on the same side of the unit case 2. It communicates with the fuel suction port 2i of the fuel pump unit U that opens at the end of the fuel pump. Further, the suction pipe portion 11 is connected to the upstream side conduit portion of the fuel conduit 1 and communicates with the fuel tank T via the fuel conduit 1.

Further, a discharge pipe portion 12 as a fuel discharge port for discharging the high-pressure fuel in the high-pressure chamber H is integrally projected on the outer peripheral portion of the casing body Cm. The discharge pipe portion 12 is connected to the fuel injection valve F via a downstream conduit portion of the fuel conduit 1 so that the high pressure fuel in the high pressure chamber H can be supplied to the fuel injection valve F.

In the present embodiment, the cover body Ca and the casing main body Cm that divide the casing C are each formed as an integral body by injection molding of synthetic resin. In particular, in the casing main body Cm, at least a part (all in the present embodiment) of the fuel pump unit U assembled in advance in a separate manufacturing process at a portion adjacent to the high-pressure chamber H is inserted into the insert mold along with the injection molding. Is done.

At one end of the unit case 2 of the fuel pump unit U, a stepped discharge cylinder portion 2a serving as an outlet for high-pressure fuel discharged from the fuel pump in the unit case 2 is integrally projected. The inner wall portion Cmi of the casing main body Cm surrounding the high-pressure chamber H has an end surface Cmie opposite to the receiving hole M closely adhered to at least a part of the distal end surface 2ae of the discharge cylinder portion 2a. Arranged and configured in a state.

In the present embodiment, the casing body Cm is provided with a coupler CP for supplying power to the fuel pump unit U. The coupler CP is composed of a coupler cylinder portion CPc that protrudes integrally on the outer peripheral portion of the casing body Cm, and three coupler terminals CPt that face the outer end portion in the coupler cylinder portion CPc. The inner ends of the coupler terminals CPt are respectively coupled (that is, electrically connected) to three conductive connection members 10 protruding from the end surface of the unit case 2 as a power receiving unit of the fuel pump unit U (particularly, the electric motor in the unit U). Connected). Thus, the coupler CP is detachably coupled to a coupler of an external wiring (not shown), so that the electric motor in the fuel pump unit U is energized through the external wiring during operation of the engine (thus driving the fuel pump). It can be done.

When the casing body Cm is injection-molded as described above, a part of the coupler terminal CPt and the conductive connection member 10 are insert-molded together with the fuel pump unit U into the casing body Cm.

In the casing body Cm, three communication holes 15 for communicating at least a part of each coupler terminal CPt with the low pressure chamber L are formed at intervals. One end of the communication hole 15 opens into the annular space Lo of the low pressure chamber L, and the plate surface of the intermediate portion of each coupler terminal CPt is exposed at the other end. The communication hole 15 extends linearly in a direction along the axis of the casing C. Therefore, the central hole of the communication hole 15 and the high / low pressure chambers H and L and the receiving hole M are substantially parallel to each other. is there. A small through hole h having a diameter smaller than that of the communication hole 15 is formed at an intermediate portion of each coupler terminal CPt exposed in each communication hole 15, and a positioning of a mold pin P, which will be described later, is formed in the small through hole h. The projections Pats can be inserted.

Next, the operation of the first embodiment will be described. When the engine is in operation, the fuel pump unit U that is energized operates to suck and pressurize the fuel in the fuel tank T, and supplies the pressurized fuel to the fuel injection valve F of the engine through the fuel pressure adjusting body A.

In this case, if the fuel pressure discharged from the fuel pump unit U (that is, the pressure in the high pressure chamber H) is to rise above a predetermined value, the regulator valve V of the fuel pressure adjusting body A is opened to operate the high pressure chamber H. A part of the high-pressure fuel is leaked to the low-pressure chamber L side, and the leaked fuel is released from the low-pressure chamber L to the fuel tank T side through the drain pipe 3. As a result, the fuel pressure in the high pressure chamber H and the fuel pressure discharged from the fuel pump unit U are adjusted to a predetermined value or less.

In particular, in the fuel pressure adjusting body A of the present embodiment, the high pressure chamber L defined in the casing C surrounds the high pressure chamber H of the casing C and the receiving hole M for accommodating the regulator valve. H and an annular space Lo extending around the receiving hole M are included, and by special provision of the annular space Lo, the peripheral wall of the high-pressure chamber (that is, the inner wall portion Cmi) of the casing C is protected from an impact such as an external force or a stepping stone. Can be effectively protected. As a result, it is possible to effectively and effectively prevent a situation in which the high-pressure chamber peripheral wall Cmi is damaged due to the external force or impact and a sudden fuel leakage from the high-pressure chamber H occurs. Moreover, when the annular space Lo of the low pressure chamber L surrounds the high pressure chamber H and the receiving hole M, the operation sound generated by the regulator valve V in the receiving hole M and the pump operation propagating from the fuel pump unit U to the high pressure chamber H side. Since sound and the like can be effectively sound-insulated, it is possible to effectively suppress those operating sounds from leaking outside through the casing C.

In the casing C of the present embodiment, the casing main body Cm is integrally formed with a portion Cmo surrounding the annular space Lo and a portion Cmi surrounding the receiving hole M and the high-pressure chamber H. , A low pressure chamber L (particularly substantially all of the annular space Lo and a part of the base space Lb), a receiving hole M and a high pressure chamber H are defined, and the annular space Lo of the low pressure chamber L and the receiving hole The central axes of the M and the high pressure chamber H coincide with each other or are substantially parallel to each other. Thus, when manufacturing the casing main body Cm having several spaces (high / low pressure chambers H, L, receiving holes M, etc.) for shielding the fuel, the casing main body Cm is constructed by assembling the sealing material and a number of wall materials. Therefore, the casing main body Cm can be manufactured efficiently and inexpensively while ensuring the liquid-tightness of the fuel. In addition, as will be described later, by using a single mold pin P, the high / low pressure chambers H and L and the receiving hole M can be simultaneously and easily formed with high accuracy, so that the production efficiency can be improved.

By the way, when the casing body Cm is integrally formed by injection molding with a synthetic resin, the coupler terminal CPt is coupled to the conductive connection member 10 as the power receiving unit of the fuel pump unit U in advance, and then the fuel pump unit U is made of gold. Set in a predetermined position in the cavity of a mold (not shown). And the synthetic resin material of a molten state is inject | emitted to the cavity, and the whole unit including the discharge cylinder part 2a of the fuel pump unit U is insert-molded in the casing main body Cm. As a result, sufficient liquid tightness between the fuel pressure adjusting body A and the fuel pump unit U can be secured without using a seal member, and the fuel pressure adjusting body A and the fuel pump unit U are assembled together. The process can be simplified.

Further, when the insert molding is performed, for example, a single mold pin P as illustrated in FIG. 3 is used. The mold pin P integrally includes a first protrusion Pa for forming the annular space Lo and a stepped second protrusion Pb for forming the receiving hole M and the high-pressure chamber H. Three small-diameter projections Pat for forming the communication hole 15 are integrally connected to the tip of the first protrusion Pa, and further provided at the middle of each coupler terminal CPt on the tip of the small-diameter projection Pat. Further, positioning projections Pats that can be inserted into the small through-holes h are integrally projected. Further, a positioning projection Pbs that can be inserted into the distal end opening of the discharge cylinder portion 2a of the fuel pump unit U is integrally provided on the distal end surface of the second projecting portion Pb.

In a state where the mold pin P and the fuel pump unit U are set in the mold before injection molding, the tip surface of the small-diameter protrusion Pat of the mold pin P (first protrusion Pa) is the middle of the coupler terminal CPt. The positioning projections Pats are inserted into the small through-holes h, and the distal end surface of the second projecting portion Pb is abutted against the distal end surface 2ae of the discharge cylinder portion 2a of the fuel pump unit U for positioning. By inserting the protrusions Pbs into the discharge cylinder portion 2a, the positioning of the mold pins P on the mold (and therefore the setting operation) can be performed easily and accurately.

When the injection molding of the casing body Cm is completed from the set state and the mold pin P is extracted from the mold, in the casing body Cm, the annular space portion Lo and the communication hole are included in the trace of the first protrusion Pa. 15 is formed, and a receiving hole M and a high-pressure chamber H are formed in the trace of the second projecting portion Pb. In the casing body Cm after the injection molding, the high pressure chamber H is disposed adjacent to the receiving hole M on the same axis, and the annular inner wall portion Cmi surrounding the high pressure chamber H of the casing body Cm is the inner wall portion Cmi, An end surface Cmie opposite to the receiving hole M is in close contact with a part of the front end surface 2ae of the discharge cylinder portion 2a of the fuel pump unit U over the entire circumference.

Thus, at the time of resin molding of the casing main body Cm, not only can the high and low pressure chambers H and L and the receiving hole M be simultaneously molded with the single mold pin P, but also the discharge cylinder of the fuel pump unit U. Sealing between the portion 2a and the casing main body Cm can be accurately performed at the same time, and the production efficiency can be further improved.

Further, the casing main body Cm of the present embodiment is integrally formed with a coupler cylinder portion CPc constituting the coupler CP together with a coupler terminal CPt for supplying power to the fuel pump unit U. Since the connecting member 10 and a part of the coupler terminal CPt coupled thereto are insert-molded, the coupler CP can be integrated into the casing body Cm at the same time as the resin molding of the casing body Cm, thereby reducing cost. It is done. In addition, a part of the coupler terminal CPt is exposed in the communication hole 15 connected to the low pressure chamber L (annular space portion Lo) in the wall of the casing body Cm, so that the high pressure fuel in the fuel pump unit U is connected to the connecting member 10. In addition, even if it is attempted to leak outside through a minute gap at the boundary surface between the coupler terminal CPt and the casing body Cm (resin), the leaked fuel from the boundary surface passes through the communication hole 15 and the low pressure chamber L (and hence the fuel tank T). ). As a result, external leakage of fuel can be effectively prevented through the boundary surface.

In addition, since the communication hole 15 opened to the annular space Lo of the low pressure chamber L and the high / low pressure chambers H, L and the receiving hole M are substantially parallel to each other, the resin mold of the casing main body Cm is provided. At the time of molding, the communication hole 15 and the high / low pressure chambers H and L and the receiving hole M can be molded simultaneously and easily with a single mold pin P, thereby further improving the production efficiency.

Second embodiment

Next, a second embodiment will be described with reference to FIG.

In the fuel pump unit U of the second embodiment, a deaeration port 2d for discharging bubbles generated in the fuel pump unit U is opened at the end of the unit case 2 opposite to the regulator valve V. is doing. On the other hand, a deaeration passage 20 extending in parallel with the axis of the casing body Cm is formed on the outer peripheral wall of the casing body Cm. One end of the deaeration passage 20 communicates with the annular space Lo of the low pressure chamber L through the small through hole h and the communication hole 15 of at least one coupler terminal CPt. The other end of the deaeration passage 20 communicates with the deaeration port 2d via a communication chamber 21 formed at the end of the casing body Cm. A plug 22 for liquid-tightly closing the outside of the communication chamber 21 is fixed to the end of the casing main body Cm by a retrofit.

Other configurations are the same as those of the first embodiment, and therefore, the same reference numerals as those of the corresponding components in the first embodiment are given to the respective components, and description thereof is omitted.

Thus, in the second embodiment, it is possible to achieve basically the same operational effects as the above-described operational effects of the first embodiment.

Further, the casing body Cm of the second embodiment has a deaeration passage 20 having one end communicating with the deaeration port 2d of the fuel pump unit U and the other end communicating with the annular space Lo of the low pressure chamber L. Therefore, the fuel pump unit U is removed from the discharge side of the fuel pump unit U using the fuel flow path (ie, the low pressure chamber L) for returning excess fuel from the discharge side of the fuel pump unit U to the fuel tank T side. I can do it. This eliminates the need for dedicated external piping for degassing, and simplifies and downsizes the structure. In addition, since the deaeration passage 20 communicates with the low-pressure chamber L, in particular, the annular space Lo extending annularly around the receiving hole M, the degree of freedom in layout of the deaeration passage 20 is increased and shortened. The deaeration passage 20 can be easily arranged.

As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, Various embodiment is possible within the scope of the present invention.

For example, in the embodiment described above, the fuel pump unit U is entirely insert-molded in the casing C (casing body Cm) of the fuel pressure adjusting body A. However, in the present invention, a part of the fuel pump unit U, For example, only the discharge cylinder portion 2a may be insert-molded in the casing body Cm so that the remaining portion of the fuel pump unit U is exposed to the outside. Further, in the first and second features of the present invention, the fuel pump unit U is coupled to the fuel pressure adjusting body A by, for example, coupling means other than the insert mold (for example, screwing, welding, welding, caulking, adhesion, etc.). You may do it.

Moreover, in the said embodiment, although what showed the fuel discharge part (discharge pipe part 12) provided in the casing main body Cm connected to the fuel injection apparatus (fuel injection valve F) via the fuel conduit | pipe 1, the fuel injection apparatus was shown. Depending on the arrangement and structure of the (fuel injection valve F) and the fuel supply module FM, the fuel discharge portion (discharge pipe portion 12) of the casing body Cm is connected to the fuel injection device (fuel injection valve F) via the fuel conduit 1. You may make it connect directly.

Claims

A high pressure chamber (H) into which high pressure fuel can be introduced into the casing (C), a fuel discharge port (12) for discharging the high pressure fuel introduced into the high pressure chamber (H), and a fuel tank (T) A fuel pressure regulator comprising: a low pressure chamber (L) communicating with the pressure chamber; and a pressure regulating valve (V) capable of adjusting the fuel pressure in the high pressure chamber (H).
The pressure regulating valve (V) is a valve housing fitted in a liquid-tight manner in a receiving hole (M) provided in the casing (C) so as to communicate between the high pressure chamber (H) and the low pressure chamber (L). (Vh) and at least a valve body (Vv) housed in the valve housing (Vh) and capable of conducting and blocking between the high pressure chamber (H) and the low pressure chamber (L),
The low pressure chamber (L) includes at least an annular space (Lo) extending around the high pressure chamber (H) and the receiving hole (M) so as to surround the high pressure chamber (H) and the receiving hole (M). A fuel pressure regulator comprising:
Portions (Cmo, Cmi) surrounding at least the annular space (Lo) and the receiving hole (M) of the casing (C) are integrally molded, and the annular space (Lo) and The receiving hole (M) is defined;
2. The fuel pressure adjusting body according to claim 1, wherein the annular space portion (Lo) and the receiving hole (M) have their center axes aligned or substantially parallel to each other.
3. The fuel pressure according to claim 2, wherein the integral molding is injection molding of a synthetic resin, and insert molding at least a discharge cylinder portion (2 a) of the high-pressure fuel of the fuel pump unit (U). 4. Adjustment body.
The high pressure chamber (H) is arranged adjacent to the receiving hole (M) on the same axis,
The inner wall portion (Cmi) of the casing (C) surrounding the high pressure chamber (H) has an end surface (Cmi) opposite to the receiving hole (M) of the inner wall portion (Cmi). The fuel pressure regulator according to claim 3, wherein the fuel pressure regulator is in close contact with at least a part of the front end surface (2ae) of (2a) over the entire circumference.
The casing (C) made of synthetic resin is integrally provided with a coupler cylinder portion (CPc) constituting a coupler (CP) together with a coupler terminal (CPt) connected to the power receiving portion (10) of the fuel pump unit (U). Is formed,
In the integral molding, at least a part of the power receiving unit (10) and the coupler terminal (CPt) is insert-molded,
The fuel pressure according to claim 4, wherein the coupler terminal (CPt) is exposed in a communication hole (15) connected to the low pressure chamber (L) in the wall of the casing (C). Adjustment body.
The communication hole (15) that opens to the annular space (Lo) of the low-pressure chamber (L) and the receiving hole (M) have their central axes substantially parallel to each other. Item 6. The fuel pressure regulator according to Item 5.
A fuel supply module (FM) comprising the fuel pressure regulator (A) according to any one of claims 4 to 6 and the fuel pump unit (U) fixed to the casing (C). And
One end of the casing (C) communicates with the deaeration port (2d) of the fuel pump unit (U) and the other end of the degassing passage (20) communicates with the annular space (Lo). The fuel supply module is provided with a portion.