KR101603656B1 - High presure fuel pump for direct injection type gasoline engine - Google Patents

Abstract

The present invention relates to a high pressure fuel pump for a direct injection type gasoline engine, and more particularly to a high pressure fuel pump for a direct injection type gasoline engine, which comprises a body having an inlet side and a discharge side opening formed on a side surface thereof and a damper coupling portion for mounting a damper portion thereon, Side check valve and an inlet-side check valve coupled to the discharge-side opening to open and close the discharge-side check valve so as to open and close the discharge-side check valve, There is provided a configuration including a flow rate control valve for controlling the supply flow rate of the fuel to be discharged and the discharge pressure so as to minimize the noise and vibration generated during operation of the actuator (solenoid) provided inside the flow rate control valve .

Description

HIGH PRESURE FUEL PUMP FOR DIRECT INJECTION TYPE GASOLINE ENGINE

The present invention relates to a high-pressure fuel pump for a direct injection type gasoline engine, and more particularly, to a high-pressure fuel pump for a direct injection type gasoline engine, in which a gasoline engine sucks air and compresses the gasoline fuel directly into the cylinder, Pressure fuel pump for a high-pressure fuel pump.

Gasoline Direct Injection type engine technology is being developed to improve fuel efficiency and performance of gasoline engines.

In a conventional gasoline engine, power is generated by a suction / compression / ignition / explosion / exhaust process of an air / fuel mixture, whereas a direct injection gasoline engine sucks and compresses air and injects fuel .

This approach is similar to the compression ignition method of a diesel engine.

Therefore, the direct injection type gasoline engine can realize a high compression ratio exceeding the limit of the compression ratio of a conventional gasoline engine, thereby maximizing fuel economy.

In such a direct injection gasoline engine, fuel pressure becomes a very important factor, and a high-performance high-pressure fuel pump is required for this.

For example, the present applicant has filed and filed a high pressure fuel pump for a direct injection type gasoline engine in many of the following Patent Documents 1 and 2 and the like.

The high-pressure fuel pump for a direct injection type gasoline engine according to the related art is mounted on an engine camshaft, the pump shaft is rotated by the rotation force of the cam, and the piston of the pump is driven by the rotational force to generate a pressure to inject gasoline fuel into the injector .

To this end, a high-pressure fuel pump for direct injection type gasoline engine according to the prior art is provided with a flow control valve for controlling the opening and closing operation of the inlet-side check valve to control the discharge flow rate of the high-pressure fuel pump.

Korean Patent Registration No. 10-1171995 (issued on August 8, 2012) Korea Patent Registration No. 10-1182130 (issued on September 12, 2012) Korean Patent Registration No. 10-1361612 (Announcement on February 13, 2014)

However, the actuator that operates the flow control valve generates vibration and noise due to impact when the high-pressure fuel pump is driven in a collision with the stopper provided on the inlet-side check valve.

Particularly, since the actuator generates high-frequency noise while the inlet-side check valve operates in a relatively low-speed section in which the engine is relatively quiet, the high-pressure fuel pump according to the prior art causes the driver to increase dissatisfaction due to noise.

The high pressure fuel pump for a direct injection type gasoline engine according to the related art has a spring mounted portion formed in an actuator of a flow control valve and is formed in an open shape so that it is coupled to the outside of the body of the high pressure fuel pump, To the outside.

In order to solve such a problem, the applicant of the present invention has filed and registered a patent of the flow control valve which minimizes noise and vibration generated during the operation of the actuator.

However, even when the configuration of Patent Document 3 is applied, there is a limit to completely eliminate the vibration and noise generated in the operation of the actuator.

It is an object of the present invention to provide a high pressure fuel pump for a direct injection type gasoline engine capable of minimizing noise and vibration generated during operation of an actuator provided inside a flow control valve.

It is another object of the present invention to provide a high-pressure fuel pump for a direct injection type gasoline engine which improves the shape of the flow guide to increase the flow rate of the fuel and improve the operational stability of the inlet side check valve.

In order to achieve the above object, a high-pressure fuel pump for a direct injection type gasoline engine according to the present invention includes a body having a damper coupling portion formed at a side surface thereof with an inlet side and a discharge side opening and having a damper portion mounted thereon, A damper part coupled to the damper coupling part of the body and reducing pulsation of the sucked fuel, a discharge side check valve coupled to the discharge side opening, and an inlet side check valve coupled to the discharge side opening, And a flow rate control valve for controlling the supply flow rate and discharge pressure of the fuel discharged through the discharge side check valve by opening and closing the valve, wherein the flow rate control valve is connected to the plunger provided in the solenoid and the plunger, The motion mass of the needle which opens and closes the solenoid is reduced, Thereby attenuating the noise and vibration generated.

The flow control valve includes a solenoid for receiving a current and linearly reciprocating a plunger provided therein, an inlet side valve for supplying fuel to a discharge side check valve of the high-pressure fuel pump while preventing reverse flow of fuel introduced into the valve by operation of the solenoid, A check valve, a needle for linearly reciprocating by the action of the solenoid to open and close the inlet check valve, and a needle guide for guiding the linear reciprocating movement of the needle, wherein the plunger and the needle each minimize the movement mass And is formed in a cylindrical shape and a round bar shape to attenuate noise and vibration generated during operation.

The needle guide is formed in a cup shape having an opened upper surface. The needle guide is filled with fuel to absorb vibration and noise by using the pressure of the fuel when the plunger reciprocates linearly.

Wherein the plunger is formed with a coupling groove into which the upper end of the needle is coupled and a flow path is formed outside the coupling groove to transmit the fuel between the needle guide and the plunger to the core side of the solenoid, And a ball is formed.

And an annular groove is formed in the lower end of the core or the upper end of the plunger so as to bring the core and the plunger into line contact with each other.

And an annular projection is formed at a lower end of the core of the solenoid or at an upper end of the plunger so as to bring the core and the plunger into line contact with each other.

The inlet-side check valve includes a body formed in a cylindrical shape having an open top and formed with a filling space filled with fuel at the center, a valve body for opening and closing a delivery hole for transferring fuel filled in the filling space into the high- Pressure fuel pump through a delivery hole of the body, and a stopper coupled to a lower portion of the body and an elastic spring for providing an elastic force to the valve body. Is formed.

The outer wall of the guide passage may be formed as an inclined surface inclined toward the outer lower end of the outer wall so as to prevent vortex when the fuel moves, or may be formed as a curved surface having a predetermined curvature.

And an annular rib is formed in the lower portion of the valve body to receive the upper end of the elastic spring. The stopper is formed in a cap shape having an opened upper surface, and the annular rib is fixed to the stopper And moves up and down along the inner side wall of the lower end portion.

The needle and the needle guide provided on the flow control valve are installed in close contact with the inside of the body to transmit noise and vibration generated during operation of the flow control valve to the body.

As described above, according to the high-pressure fuel pump for a direct injection type gasoline engine according to the present invention, it is possible to minimize the noise and vibration generated during the operation of the actuator (solenoid) provided inside the flow control valve.

That is, according to the present invention, the needle guide is formed into a cup shape, the fuel is filled in the needle guide, the noise and vibration due to the impact are absorbed by the pressure of the fuel, and the needle guide An effect of preventing collision between the plunger and the needle guide can be obtained.

According to the present invention, the needle is formed into a circular bar shape and the plunger is formed in a cylindrical shape to minimize the movement mass of the needle and the plunger, and an annular groove or an annular projection is formed at the lower end of the core or the upper end of the plunger, The noise and vibration due to the collision between the plunger and the core can be attenuated.

In addition, according to the present invention, it is possible to prevent the generation of vortices and improve the moving speed of the fuel by forming the guide passage in the lower portion of the body of the inlet-side check valve to transfer the fuel introduced into the body to the body .

According to the present invention, since the valve body is moved up and down along the inner wall of the lower end portion of the stopper formed in the cap shape by forming the annular rib at the lower portion of the valve body of the inlet side check valve, The operation safety can be improved.

As a result, according to the present invention, it is possible to minimize noise and vibration generated during operation of the flow control valve, thereby improving the reliability of a product by eliminating a driver's rejection due to noise and vibration when the vehicle is equipped with a high- .

1 is a perspective view of a high-pressure fuel pump for a direct injection type gasoline engine having a flow control valve according to a preferred embodiment of the present invention,
2 is a sectional view of the high-pressure fuel pump shown in FIG. 1,
3 is a perspective view of the flow control valve shown in Fig. 2,
Figs. 4 and 5 are an exploded perspective view and an enlarged cross-sectional view of the flow control valve shown in Fig. 2,
Fig. 6 is an enlarged view of the core shown in Fig. 4,
7 is an enlarged view of the body shown in Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a high-pressure fuel pump for a direct injection type gasoline engine provided with a flow control valve according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that the high-pressure fuel pump described in this embodiment is a high-pressure fuel pump for a direct-injection gasoline engine of a single-piston type having a single pump piston which can be manufactured at low cost.

FIG. 1 is a perspective view of a high-pressure fuel pump for a direct injection type gasoline engine having a flow control valve according to a preferred embodiment of the present invention, and FIG. 2 is a sectional view of the high-pressure fuel pump shown in FIG.

1 and 2, a high-pressure fuel pump for a direct injection type gasoline engine having a flow control valve according to a preferred embodiment of the present invention includes inlet and outlet openings 11 and 12 formed on a side surface thereof, A body 10 having a damper engaging portion 13 on which a damper portion 30 is mounted and a bracket 20 having a suction means 21 coupled to a lower portion of the body 10 and generating a suction force of fuel therein A damper part 30 coupled to the damper engaging part 13 of the body 10 and reducing pulsation of the sucked fuel; a damper part 30 coupled to the inlet side opening 11 and connected to the inlet 10 to control the supply flow rate and discharge pressure of the fuel; A flow control valve 40 for opening and closing the check valve 50 and a discharge check valve 60 coupled to the discharge side opening 12. [

In addition, the high-pressure fuel pump for the direct injection type gasoline engine according to the preferred embodiment of the present invention is integrally formed with the suction means 21 between the body 10 and the cam of the engine camshaft (not shown) And a roller tap portion (not shown) for converting the motion into a linear reciprocating motion and transferring the motion to the suction means 21.

The flow rate control valve 40 controls the opening and closing operation of the inlet side check valve 50 by the operation of the solenoid so that the fuel delivered to the flow rate control valve 40 via the damper portion 30 is supplied to the inlet side check valve 50 To the discharge side check valve (60).

Therefore, the flow control valve 40 can control the supply flow rate and the discharge pressure of the fuel supplied to the body 10 of the high-pressure fuel pump by controlling the opening and closing operation of the inlet-side check valve 50 by the operation of the solenoid .

The configuration of the flow control valve will be described in detail with reference to Figs. 3 to 5. Fig.

FIG. 3 is a perspective view of the flow control valve shown in FIG. 2, and FIGS. 4 and 5 are an exploded perspective view and an enlarged cross-sectional view of the flow control valve shown in FIG.

In the following, the terms "upward", "downward", "forward" and "rearward" and other directional terms are defined with reference to the states shown in the drawings.

3 and 4, the direction in which the inlet-side check valve 50 is installed around the housing 42 of the flow control valve 40 is referred to as a forward or tip end F, Rear or rear end B '.

Similarly, the upper and lower sides and the left and right sides of the housing 42 are referred to as a "vertical direction (U, D) and a left and right direction (L, R)", respectively.

3 and 4, the flow control valve 40 includes a solenoid 41 that receives a current and reciprocates the plunger provided therein, a cylindrical solenoid 41 having one side opened and a solenoid 41 A cover 43 that is sealed at the rear end of the housing 42 and a cover 42 which is provided at the front end of the housing 42 and prevents the backflow of the fuel introduced into the housing 42, A needle 44 which is linearly reciprocated by the operation of the solenoid 41 to open and close the inlet check valve 50 and a needle 44 which is connected to the tip of the housing 42 A needle guide 45 for guiding the linear reciprocating motion of the needle 44 and a spring 46 installed inside the solenoid 41 to provide a restoring force to the needle 44.

4 and 5, the solenoid 41 includes a bobbin 412 around which a coil 411 is wound on an outer peripheral surface, a core 413 provided inside the bobbin 412, and a current And a plunger 414 that linearly reciprocates by a magnetic field generated while being supplied.

The housing 42 is formed with a cylindrical shape with both ends opened and a cover 43 is coupled to the rear end of the housing 42. A casing 421 is coupled to the inlet side opening 11 at the front end of the housing 42, Can be combined.

The casing 421 is formed in a cylindrical shape having a mounting space such that a needle guide 45 is installed at the center of the casing 421. An annular protrusion 422 coupled to the inside of the bobbin 412 of the solenoid 41 May be formed.

The plunger 414 is formed in a cylindrical shape and has a coupling groove 415 for coupling the rear end of the needle 44 to the distal end of the plunger 414. A needle 44 is provided at the tip of the core 413, An insertion groove 416 into which a spring 46 for providing a restoring force is inserted can be formed.

5, the plunger 414 moves to the core 413 side by overcoming the elastic force of the spring 46 by the magnetic field generated by the coil 411, The inlet side check valve 50 is closed while the needle 44 coupled to the inlet side check valve 414 is moved up.

On the other hand, when the current supplied to the coil 411 is cut off, the plunger 414 moves toward the needle 44 due to the elastic force of the spring 46. When the needle 44 is moved downward, Is opened.

At least one flow passage is formed in the plunger 414 so as to transmit fuel between the needle guide 45 and the plunger 414 to the space between the plunger 414 and the core 413 outside the coupling groove 415 .

The plunger 414 may be formed with a communication hole connected to the coupling groove 415 to communicate the fuel between the needle guide 45 and the plunger 414 toward the core 413.

6 is an enlarged view of the core shown in Fig.

6 (a), the lower end of the core 413 is provided with an annular groove (not shown) so as to minimize the contact area between the plunger 414 and the core 413 during the ascending and descending operation of the plunger 414. [ 417 may be formed.

Alternatively, the lower end of the core 413 may be provided with an annular projection 418, as shown in Fig. 6 (b).

Of course, the present invention may be modified to form the annular protrusion 418 and the annular groove 417 at the upper end of the plunger 414, respectively.

As described above, the present invention minimizes the generation of vibration and noise due to the collision between the plunger and the core by minimizing the contact area by bringing the plunger and the core into line contact during the plunger operation.

The plunger 414 and the core 413 are preferably formed at a constant height so that the stroke of the needle 44 can be controlled to a predetermined reference value.

Meanwhile, as shown in FIG. 5, a sleeve 419 may be provided between the core 413 and the casing 421.

The sleeve 419 is formed in a cylindrical shape and the central portion of the sleeve 419 may be formed to have a smaller diameter than the diameter of the upper end and the lower end so that the lower end of the core 413 and the upper end of the casing 421 are inserted. The upper end and the lower end of the sleeve 419 may be joined to the core 413 and the casing 421 by the lap welding method in a state where the lower end of the core 413 and the upper end of the casing 421 are coupled to each other.

Here, the inner diameter of the sleeve 419, which provides a space for the plunger 414 to move up and down, is an important factor for determining the stroke of the plunger 414 and the needle 44.

Therefore, according to the present invention, since the sleeve is provided between the core and the casing and is joined by the lap welding method, the inner diameter of the sleeve, that is, deformation (contraction) of the plunger lifting operation space can be minimized by heat during the welding process.

Thus, the present invention can precisely control the stroke of the needle and the plunger, and can improve the efficiency of the process management work.

A connector 47 electrically connected to the core 413 and the coil 411 of the solenoid 41 may be provided at one end of the housing 42. [

The needle 44 may be formed into a bar shape having a circular cross section.

As described above, according to the present invention, in the prior art, the flange formed at the center of the needle is removed to form a circular bar shape, and the volume and mass of the plunger are reduced to minimize the moving mass of the needle and the plunger, It is possible to prevent vibration and noise generated during operation of the control valve.

According to the test results applied to the product, the present invention reduces the needle-plunger mass (about 1.48 g) by about 60% compared to the prior art needle and plunger mass (about 3.79 g) Mass can be minimized.

The needle guide 45 is formed in the shape of a cup having an opened upper surface and a mounting hole in which the needle 44 can be vertically moved can be formed on the lower surface of the needle guide 45.

As described above, according to the present invention, since the needle guide is formed into a cup shape, the space inside the needle guide can be filled with fuel and the noise and vibration generated during the lifting operation of the needle and the plunger can be absorbed by using the fuel pressure.

The needle guide 45 is press-fitted into an installation space formed at the center of the casing 421 and the upper end of the needle guide 45 is inserted into the plunger 414 to prevent vibration and noise due to collision during the down operation of the plunger 414. [ (414), as shown in FIG.

The needle 44 and the needle guide 45 may be installed as close as possible to the inside of the body 10 in order to transmit and reduce the noise and vibration generated when the plunger 414 reciprocates linearly.

In other words, the tip end of the needle guide 45 can be installed inside the outer wall of the body 10.

The inlet side check valve 50 functions to supply the introduced fuel to the discharge side check valve 60 while preventing the back flow of the fuel by the lifting operation of the plunger 414 and the needle 44 of the solenoid 41.

The inlet-side check valve 50 includes a body 51 formed with a cylindrical shape with an open upper surface and a filling space 511 filled with fuel at the center, a fuel filled in the filling space 511, A stopper 53 coupled to a lower portion of the body 51 and a valve body 52 provided between the stopper 53 and the valve body 52. The valve body 52 (Not shown).

At least one inflow hole 513 connected to the discharge passage 31 of the damper unit 30 may be formed on the outer circumferential surface of the body 51.

7 is an enlarged view of the body shown in Fig.

7, in order to allow the fuel to flow smoothly into the body 10 through the transmission hole 512, the fuel is guided to the outside of the transmission hole 512 through a guide (not shown) The guide passage 514 may be formed.

For example, the guide passage 514 may have a rectangular cross-section as shown in FIG. 7 (a).

Alternatively, the outer side wall of the guide passage 514 may be formed as an inclined surface inclined toward the outer lower side or may be formed as a curved surface having a preset curvature so as to smoothly change the moving direction in the process of moving the fuel to prevent vortex.

In other words, the guide passage 514 can be formed by chamfering the outer wall obliquely or roundly by chamfering, thereby smoothly moving the fuel using the venturi effect, thereby increasing the moving speed and flow rate of the fuel.

4 and 5, the valve body 52 is formed in a substantially disc shape, and an annular rib 521 into which the upper end of the elastic spring 54 is inserted may be formed in the lower portion of the valve body 52.

A through hole may be formed in the annular rib 521 so that fuel can be introduced into the annular rib 521.

The valve body 52 is provided so as to be in contact with the tip of the needle 44 and closes the transmission hole 512 of the body 51 by the elastic force of the elastic spring 54 during the lifting operation of the needle 44, And is lowered by the lowering operation of the needle 44 to open the transfer hole 512 to supply the fuel into the body 10. [

As described above, the present invention simplifies the structure of the valve body and minimizes the volume and mass, thereby minimizing the vibration and noise generated during operation of the flow rate control valve.

The upper end of the stopper 53 is formed in a ring shape and can be coupled to the lower end of the body 51. [

At least one supply hole 531 may be formed on the outer peripheral surface of the upper end of the stopper 53 to supply fuel into the body 10 with the valve body 52 opening the delivery hole 512.

As described above, according to the present invention, since the annular rib is formed at the bottom of the valve body formed in a substantially disk shape and the valve body is lifted and lowered along the inner wall of the lower end portion of the cap formed like a stopper, the flow and malfunction .

Next, the coupling relationship and the operation method of the high-pressure fuel pump for the direct injection type gasoline engine having the flow control valve according to the preferred embodiment of the present invention will be described in detail.

The flow control valve 40 according to the preferred embodiment of the present invention fixes the solenoid 41 by coupling the solenoid 41 and the casing 421 to the inside of the housing 42 at the front and rear sides of the housing 42, (43) to the rear end of the housing (41) and the housing (42).

The solenoid 41 is assembled by inserting the core 413 and the plunger 414 into the bobbin 412 while the spring 46 is inserted into the insertion groove 416 formed in the core 413 . The lower end of the spring 46 is supported by the plunger 414 and the upper end of the spring 46 is supported by the core 413. [

The rear end of the needle 44 is inserted into the engaging groove 415 formed at the center of the plunger 414 of the solenoid 41. Then,

And the inlet-side check valve 50 is coupled to the lower portion of the casing 421.

At this time, a valve body 52 for opening and closing the transmission hole 512 and an elastic spring 54 for providing an elastic force to the valve body 52 are installed in the body 51 of the inlet-side check valve 50.

The tips of the needles 44 sequentially pass through the filling space 511 of the inlet-side check valve 50 and the transmission hole 512 and are coupled to the upper end of the valve body 52.

The tip end of the needle 44 is coupled to one surface of the valve body 52 and the valve body 52 is linearly reciprocated as the needle 44 linearly reciprocates by the magnetic field formed by the solenoid 41 The transfer hole 521 formed in the engaging portion 52 is opened and closed.

Accordingly, the inlet-side check valve 50 can transmit the fuel delivered through the discharge passage 31 of the damper unit 30 to the discharge pipe coupled to the body 10.

When the flow control valve 40 and the inlet-side check valve 50 are assembled, the engaging portion 52 of the inlet-side check valve 50 is engaged with the inlet-side opening 11 of the body 10.

Then, the inlet hole 511 of the inlet-side check valve 50 communicates with the discharge passage 31 of the damper portion 30 to receive the fuel.

Subsequently, the assembly of the high-pressure fuel pump is completed by connecting the outlet check valve 60, the bracket 20 provided with the suction means 21, the damper portion 30 and the roller tappet portion to the body 10.

A high pressure fuel pump for a direct injection gasoline engine equipped with a flow control valve according to a preferred embodiment of the present invention is provided on a fuel supply line for supplying fuel from a fuel tank to an engine and supplies fuel supplied from the fuel tank to a predetermined high pressure And supplied to the injector installed in the delivery pipe.

The plunger 414 of the flow control valve 40 moves toward the core 413 when a current is applied to the coil 411 of the solenoid 41 and the magnetic field formed by the coil 411 is generated.

Then, the needle 44 and the valve body 52 coupled to the plunger 414 are operated to ascend, and the delivery hole 512 of the inlet-side check valve 50 is closed to be connected to the discharge tube coupled to the body 10 It blocks the supplied fuel.

On the other hand, when the current applied to the coil 411 of the solenoid 41 is cut off, the plunger 414 moves toward the inlet-side check valve 40 by the restoring force of the spring 46. [

The needle 44 and the valve body 52 coupled to the plunger 414 open the delivery hole 512 while resiliently deforming the elastic spring 54 so that the inlet side check valve 50 To the discharge tube coupled to the body 10. The discharge space of the body 10 is connected to the discharge space.

The flow rate control valve 40 linearly reciprocates the plunger 414, the needle 44 and the valve body 52 in accordance with the magnetic field generated by the solenoid 41, And controls the supply flow rate and the discharge pressure of the fuel discharged from the high-pressure fuel pump.

The plunger 414 of the flow control valve 40 and the needle 44 may collide with the plunger 414 and the core 413 and the needle guide 45 in the course of linear reciprocating motion.

Therefore, according to the present invention, the needle guide is formed into a cup shape, the fuel is filled in the needle guide, the noise and vibration due to the impact are absorbed by the pressure of the fuel, and the needle guide is provided below the maximum falling position of the plunger , The collision between the plunger and the needle guide can be prevented.

The present invention minimizes the movement mass of the needles and the plunger and minimizes the contact area between the core and the plunger by forming an annular groove or an annular projection at the lower end of the core or at the upper end of the plunger, And noise and vibration due to the collision between the core and the core can be prevented.

Further, according to the present invention, it is possible to prevent the generation of vortices and improve the moving speed of the fuel by forming the guide passage in the lower part of the body of the inlet-side check valve to transfer the fuel introduced into the body to the body.

Through the above-described process, the present invention can minimize the noise and vibration due to the collision between the needle, the core and the needle guide during operation of the flow control valve.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a technique of attenuating operational noise and vibration of an actuator provided inside a flow control valve during operation of a high-pressure fuel pump that sucks and compresses air and compresses fuel to a high pressure to supply the fuel to an injector.

10: Body 11: Inlet side opening
12: Discharge side opening 13: Damper coupling part
20: Bracket 21: Suction means
30: damper part 31: exhaust passage
40: Flow control valve 41: Solenoid
411: Coil 412: Bobbin
413: Core 414: Plunger
415: coupling groove 416: insertion groove
417: annular groove 418: annular projection
419: Sleeve 42: Housing
421: casing 422: annular projection
43: Cover 44: Needle
45: Needle guide 451: Mounting hole
46: spring 47: connector
50: inlet-side check valve 51: body
511: filling space 512: transmission hole
513: Inflow hole 514: Guide channel
52: valve body 521: annular rib
53: stopper 531:
54: elastic spring 60: discharge side check valve

Claims (10)

A body having a damper engaging portion formed on its side surface with an inlet side and discharge side openings and a damper portion mounted on an upper portion thereof,
A bracket coupled to a lower portion of the body and having suction means for generating a suction force of fuel therein,
A damper part coupled to the damper coupling part of the body and reducing pulsation of the sucked fuel,
A discharge side check valve coupled to the discharge side opening; and
And a flow control valve for opening and closing the inlet-side check valve to control the supply flow rate of the fuel discharged through the discharge-side check valve and the discharge pressure,
The flow control valve includes a solenoid that receives a current and linearly reciprocates the plunger provided therein,
An inlet-side check valve for supplying fuel to a discharge-side check valve of the high-pressure fuel pump while preventing backflow of the fuel introduced into the solenoid by operation of the solenoid,
A needle for linearly reciprocating by the action of the solenoid to open and close the inlet check valve,
And a needle guide for guiding the linear reciprocating motion of the needle,
The plunger and the needle are respectively formed into a cylindrical shape and a circular bar shape so as to attenuate noise and vibration generated during operation by minimizing a motion mass,
The solenoid includes a bobbin on which a coil is wound on an outer circumferential surface,
A core provided inside the bobbin;
And a plunger that linearly reciprocates by a magnetic field generated when current is supplied to the coil,
A sleeve is provided between the core and a casing provided at a lower end of the solenoid,
The sleeve is formed in a cylindrical shape having a diameter smaller than the diameter of the upper end and the lower end so that the lower end of the core and the upper end of the casing are inserted, respectively,
The upper and lower ends of the sleeve are joined to the core and the casing by lap welding in a state where the lower end of the core and the upper end of the casing are coupled to each other,
The needle guide is formed into a cup shape whose upper surface is opened,
A space filled with fuel to absorb vibration and noise is formed in the needle guide using the pressure of the fuel when the plunger reciprocates linearly,
Wherein the plunger is formed with a coupling groove into which the upper end of the needle is coupled,
A moving passage is formed outside the engaging groove to transmit the fuel between the needle guide and the plunger to the core side of the solenoid,
A communication hole communicating with the coupling groove is formed,
Pressure fuel pump for a direct injection type gasoline engine, wherein a guide passage for guiding the movement of fuel flowing into the high-pressure fuel pump is formed at a lower end portion of the inlet-side check valve. delete delete delete The method according to claim 1,
Wherein an annular groove is formed in a lower end of the core or an upper end of the plunger so as to bring the plunger in line contact with the core of the solenoid. The method according to claim 1,
Wherein an annular projection is formed on a lower end of the core or an upper end of the plunger so as to bring the plunger in line contact with the core of the solenoid. 7. The method according to any one of claims 1, 5 and 6,
Wherein the inlet check valve is formed in a cylindrical shape having an open top surface and a filling space in which a fuel is filled at the center,
A valve body for opening and closing a delivery hole for delivering the fuel filled in the filling space to the interior of the high-pressure fuel pump,
A stopper coupled to a lower portion of the body,
And an elastic spring for providing an elastic force to the valve body,
And the guide passage is formed at a lower end of the body. 8. The method of claim 7,
The outer wall of the guide passage may be formed as an inclined surface inclined toward the outer lower side so as to prevent the generation of vortex when the fuel moves,
And a curved surface having a curvature set in advance. 9. The method of claim 8,
Wherein an annular rib is formed in a lower portion of the valve body to receive an upper end of the elastic spring,
Wherein the stopper is formed in a cap shape having an opened upper surface,
Wherein the annular rib is moved up and down along the inner wall of the lower end portion of the stopper so as to improve the operational stability of the inlet check valve. 8. The method of claim 7,
Wherein the needle and the needle guide provided on the flow control valve are installed in close contact with the interior of the body to transmit noise and vibration generated during operation of the flow control valve to the body. .

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