KR102310191B1 - Fuel rail - Google Patents

Abstract

The present invention relates to a fuel rail for reducing vibration transmitted from a common rail system to a high-pressure sensor, the fuel rail comprising: a main body mounted on an engine block and distributing, from an injector, high-pressure fuel compressed by a high-pressure fuel pump; a high-pressure sensor coupled to the main body to measure the pressure of the main body; and a damper member coupled between the main body and the high-pressure sensor to reduce vibration transmitted from the engine block to the high-pressure sensor.

Description

Fuel rail {FUEL RAIL}

The present invention relates to a fuel rail, and more particularly, to a fuel rail for reducing vibration transmitted from a common rail system to a high-pressure sensor.

In general, a common rail system of a vehicle is a system for continuously supplying fuel injected into a cylinder of an engine in an appropriate amount according to the degree of driving control of the engine.

As shown in FIG. 1, such a common rail system is connected to a fuel tank 1 in which fuel is stored, a high-pressure fuel pump 2 accommodated in the fuel tank 1, and the high-pressure fuel pump 2, so that fuel A fuel transport pipe 3 that allows movement, a fuel filter 4 mounted on the fuel transport pipe 3 to remove impurities in the fuel, and a fuel rail that receives the filtered fuel from the fuel filter 4 (FUEL) RAIL: 5), a high-pressure sensor 6 for measuring the pressure of the fuel rail 5 on the fuel rail 5, and the fuel installed on the fuel rail 5 and inside the fuel rail 5 It comprises an injector (7) for injecting into the cylinder, and an electronic control unit (ECU: 8) for controlling fuel injection of the injector (7).

In the fuel system of the vehicle, the pumped fuel according to the operation of the high-pressure fuel pump (2) is pumped from the fuel tank (1) to the fuel rail (5) through the fuel transfer pipe (3), The fuel introduced into the fuel rail 5 is injected into each cylinder through the injector 7 operated by the electronic control unit 8 .

Meanwhile, the high-pressure sensor 6 is connected to the fuel rail 5 in a cantilever shape.

The high-pressure sensor 6 connected in a cantilever shape has a structure vulnerable to vibration, and when a vibration mode appears in the fuel rail and common rail systems, vibration is transmitted to the high-pressure sensor, and excessive vibration causes abnormal sensing or damage of the high-pressure sensor.

The present invention is to solve the above problems, and relates to a fuel rail capable of reducing vibration transmitted from a common rail system to a high-pressure sensor.

A fuel rail according to an embodiment of the present invention is mounted on an engine block, the main body portion for distributing the high-pressure fuel compressed by the high-pressure fuel pump from the injector; a high pressure sensor coupled to the main body to measure the pressure of the main body; and a damper member coupled between the main body and the high-pressure sensor to reduce vibration transmitted from the engine block to the high-pressure sensor.

The main body may include: a passage in which fuel supplied from the high-pressure fuel pump is stored; a fuel pump connection unit coupled to a high-pressure fuel pump that protrudes outward from the outer circumferential surface and pumps fuel compressed at high pressure; a plurality of injector connection parts spaced apart from the fuel pump connection part in a longitudinal direction from the outer circumferential surface at a predetermined interval and to which an injector for injecting fuel pumped from the high-pressure fuel pump to the outside is coupled to each other; and a boss part formed in a cantilever shape to which the high-pressure sensor is coupled.

The high-pressure sensor includes: a sensor body having a suction hole through which fuel is introduced; a sensor element disposed at one end of the sensor body; a support part fixed to one surface of the sensor body and to which a printed circuit board is fixed; and a housing disposed on one surface of the support unit to conceal the sensor element and the printed circuit board.

The damper member vibrates out of phase with the vibration of the common rail system.

The damper member is formed in a ring shape, one surface is in contact with the body portion and the other surface is in contact with the high-pressure sensor; And it is formed in the shape of a washer (WASHER) includes a mass portion coupled to the outer peripheral surface of the transfer unit.

The transfer unit may include a pair of O-ring units spaced apart from each other in one direction and the other direction; and a connection part connecting the pair of O-ring parts, wherein the mass part is coupled between the pair of O-ring parts.

The thickness of the mass portion is greater than or equal to the width of the connection portion.

The damper member is formed in a ring shape, one surface is in contact with the body portion and the other surface is in contact with the high-pressure sensor; And it is formed in the shape of a cogwheel (COGWHEEL) includes a mass portion coupled to the outer peripheral surface of the transmission unit.

The damper member is formed in a ring shape, one surface is in contact with the body portion and the other surface is in contact with the high-pressure sensor; a wire part formed in plurality along the circumference of the delivery part and extending from the delivery part; And it is formed in the shape of a sphere (SPHERE) includes a mass portion coupled to the end of the wire portion.

In the fuel rail according to the present invention, vibration transmitted to the high-pressure sensor can be effectively reduced by the damper member disposed between the high-pressure sensor and the boss.

Accordingly, the vibration transmitted to the high-pressure sensor fixed to the body part in the form of a cantilever is reduced, thereby effectively reducing the error and damage of the sensing function of the high-pressure sensor.

In addition, the mass portion of the damper member can be easily designed so that the resonance frequency of the damper member and the resonance frequency of the common rail system coincide with each other by varying the number of teeth.

Further, in the damper member, since the transmission unit and the mass unit are connected by a flexible wire unit, it is possible to effectively reduce the vibration of the transmission unit while the mass unit is easily bent even with a relatively low vibration.

1 is a schematic view showing the configuration of a conventional vehicle common rail.
Figure 2 is a perspective view showing a fuel rail according to an embodiment of the present invention.
Figure 3 is an exploded perspective view showing a fuel rail according to an embodiment of the present invention.
4 is a cross-sectional view showing a coupling structure of a damper member of a fuel rail according to an embodiment of the present invention.
5 is a perspective view showing a damper member of a fuel rail according to an embodiment of the present invention.
6 is a cross-sectional view taken along line A-A' shown in FIG.
7A and 7B are operational views showing an operating state of a damper member according to an embodiment of the present invention;
8 is a comparison table of vibration responses of a fuel rail according to the prior art and a fuel rail according to an embodiment of the present invention.
9 is a perspective view showing a damper member of a fuel rail according to another embodiment of the present invention.
10 is a plan view showing a damper member of a fuel rail according to another embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is defined by the description of the claims. On the other hand, the terms used herein are for the purpose of describing the embodiments and are not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" or "comprising" refers to the presence or addition is not excluded.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view showing a fuel rail according to an embodiment of the present invention, Figure 3 is an exploded perspective view showing a fuel rail according to an embodiment of the present invention, Figure 4 is a fuel rail according to an embodiment of the present invention is a cross-sectional view showing the coupling structure of the damper member, FIG. 5 is a perspective view showing the damper member of the fuel rail according to an embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line A-A' shown in FIG. .

2 to 6 , the fuel rail according to this embodiment constituting the common rail system includes a body part 100 , a high pressure sensor 200 , and a damper member 300 .

The body part 100 is formed in a tubular shape, and is mounted on the engine block.

Then, the main body 100 stores the fuel pumped from the high-pressure fuel pump, and when the fuel reaches an appropriate pressure, the fuel can be injected into the cylinder through the injector.

The body part 100 includes a flow path part 110 , an injector connection part 130 , and a boss part 140 .

The flow path part 110 is a space in which the fuel compressed by the high-pressure fuel pump and introduced from the fuel pump connection part 120 is stored while maintaining an appropriate pressure before being supplied to the injector.

For this reason, the fuel may be injected into the cylinder through the injector at an appropriate pressure when an appropriate injection timing is reached according to the control of the electronic control unit.

The fuel pump connection part 120 protrudes outwardly from the outer circumferential surface of the body part 100 and is coupled to a high-pressure fuel pump that pumps fuel compressed at high pressure.

The fuel pump connection part 120 may be formed in plurality according to the specifications of the engine, and the last injector connection part 130 in either one direction or the other direction of the plurality of injector connection parts 130 is disposed side by side on the outside. is also possible

The injector connection part 130 is made up of a plurality and is spaced apart from the fuel pump connection part 120 in the longitudinal direction of the body part 100 and is in communication with the flow path part 110 in an outward direction from the outer circumferential surface of the body part 100 . is protruded into

In addition, the injector connection unit 130 is composed of the same number of injectors for injecting the fuel delivered under pressure from the high-pressure fuel pump to the outside, and the injectors are coupled to each other.

The boss unit 140 communicates with the flow path unit 110 to protrude outward from the outer circumferential surface of the body unit 100 .

In addition, the boss part 140 is on a different line from the fuel pump connection part 120 and the injector connection part 130 in the body part 100 unlike the fuel pump connection part 120 and the injector connection part 130 which are arranged in parallel with each other. is formed

In particular, the boss part 140 is formed in a cantilever shape, and the high pressure sensor 200 is coupled thereto.

The high pressure sensor 200 is coupled to the body part 100 , specifically, the boss part 140 protruding from the body part 100 in a cantilever shape.

In addition, the high pressure sensor 200 measures the pressure of the fuel accommodated in the flow passage 110 in order to transmit a voltage signal corresponding to an appropriate pressure of the fuel accommodated in the flow passage 110 to the electronic control unit (ECU).

For this reason, the pressure of the fuel is monitored by the high pressure sensor 200, and the pressure of the fuel is continuously adjusted according to the conditions required by the engine.

The high-pressure sensor 200 includes a sensor body 210 , a sensor element 220 , a support part 230 , and a housing 240 .

The sensor body 210 is formed in a hollow cylindrical shape, and the suction hole 211 through which fuel is introduced is exposed from the inside to the outside.

The sensor element 220 is disposed at one end of the sensor body 210 , and a detection element is disposed on one surface to support the detection element.

The sensor element 220 is formed integrally with the sensor body 210 .

That is, one end of the sensor body 210 is in communication with the outside by the suction hole 211 , and the other surface is closed by the sensor element 220 .

The support part 230 is disposed between the sensor body 210 and the housing 240, and the printed circuit board is fixed to the upper surface.

And, the support part 230 is formed with a hole in the center for the upper portion of the sensor element 220 to be disposed.

This support 230 may be additionally formed integrally with the sensor body 210 and the sensor element 220 that are already integrally formed depending on the environment of use of the pressure sensor, and the sensor body 210 and the sensor element 220 . It can be manufactured separately from each other and coupled to each other through welding.

And, the cross-sectional area of the support part 230 is formed to be larger than the cross-sectional area of the sensor body 210 .

Accordingly, the support part 230 can easily come into contact with the damping member disposed between the boss part 140 and the high-pressure sensor 200 .

The housing 240 is coupled to one surface of the support part 230 to conceal the detection element and the printed circuit board seated on one surface of the sensor element 220 so as not to be exposed to the outside.

A mounting space is formed inside the housing 240 so that the detection element and the printed circuit board may be disposed between the housing 240 and the sensor body 210 .

The damper member 300 is coupled between the body part 100, specifically the boss part 140 and the high-pressure sensor 200, and consists of a Mass Spring Damper system.

And the resonant frequency of the damper member 300 is designed to match the resonant frequency of the common rail system.

When the damper member 300 meets the natural vibration characteristics of the common rail system transmitted from the engine block to the high-pressure sensor 200 when the engine is started and resonates, the damper member 300 generates vibration of the common rail and the damper member ( 300) to oscillate out of phase.

Therefore, the damper member 300 made of the MASS SPRING DAMPER SYSTEM is disposed between the high-pressure sensor 200 and the boss 140, and vibrates in the opposite phase to the vibration of the common rail system transmitted to the high-pressure sensor 200, Vibration of the common rail system can be reduced.

On the other hand, the high-pressure sensor 200 has a resonance characteristic in a band of about 1 kHz to 2 kHz, and the vibration of the common rail system transmitted to the high-pressure sensor 200 is the structure of the boss unit 140 to which the high-pressure sensor 200 is coupled. , the high-pressure sensor 200 and the boss unit 140 are different depending on the coupling structure, position, and the like.

Therefore, it is important to accurately predict/test the system vibration characteristics of the high-pressure sensor 200 and design the damper member 300 suitable therefor.

The damper member 300 includes a transmission unit 310 and a mass unit 320 .

The delivery unit 310 is formed in a ring shape, and one surface is in contact with the body portion 100 , and the other surface is in contact with the high-pressure sensor 200 .

And, the transfer unit 310 may be made of a RUBBER material.

The transfer unit 310 includes a pair of O-ring units and a connecting unit 311 .

The pair of O-ring parts are spaced apart from each other at a distance in one direction and the other, and the connecting part 311 interconnects the pair of O-ring parts spaced apart from each other.

In addition, the O-ring part disposed in one direction is in contact with the boss part 140 of the body part 100 , and the O-ring part disposed in the other direction is in contact with the support part 230 of the high-pressure sensor 200 .

That is, when the high-pressure sensor 200 is coupled to the boss unit 140 , the transmission unit 310 blocks the transmission unit 310 of the high-pressure sensor 200 from contacting the boss unit 140 .

The mass unit 320 is made of a metal material such as steel, is formed in a washer shape, and is coupled to the outer circumferential surface of the transmission unit 310 .

Specifically, the mass portion 320 is sandwiched between a pair of O-ring portions, and is in contact with the outer circumferential surface of the connecting portion 311 .

That is, the mass unit 320 vibrates in the same direction as the vibration direction of the transmission unit 310 in the area coupled to the transmission unit 310 , and the remaining radial area except for the area coupled to the transmission unit 310 is free. vibrate

On the other hand, the thickness of the mass portion 320 is made to be thicker than or equal to the width of the connection portion 311 .

Accordingly, the mass unit 320 is elastically coupled by a pair of O-ring units and is firmly fixed to the transmission unit 310 .

Hereinafter, an operation process of the damper member 300 according to an embodiment of the present invention will be described with reference to the drawings.

7A and 7B are operational views showing the operation state of the damper member 300 according to an embodiment of the present invention.

First, referring to FIG. 7A, when the vibration of the common rail system is transmitted to the boss part 140 through the body part 100 of the fuel rail when the engine is started, the boss part 140 moves to the damper member 300 according to the vibration direction. ), the transfer unit 310 of the damper member 300 moves in one direction.

At this time, when the transfer unit 310 moves in one direction, the mass unit 320 moves in one direction later than the transfer unit 310 in a stopped state.

That is, the force of the transfer unit 310 to move in one direction by the mass unit 320 is reduced.

And, referring to FIG. 7B , the transmission unit 310 moves in the other direction again according to the vibration direction of the common rail system.

At this time, when the transfer unit 310 moves in the other direction, the mass unit 320 moves in the other direction later than the transfer unit 310 while moving in one direction.

Accordingly, the mass unit 320 pulls the force to move of the transfer unit 310 , thereby reducing the force of the transfer unit 310 to move in the other direction.

By repeating this process several times, the vibration transmitted to the high-pressure sensor 200 by the damper member 300 disposed between the high-pressure sensor 200 and the boss 140 can be effectively reduced.

8 is a graph comparing the vibration response of the present invention in which the damper member 300 is disposed and the conventional fuel rail without the damper member 300 .

First, it has been shown that the conventional fuel rail without a damper member has a higher frequency when reaching a specific section.

However, it was found that the frequency of the fuel rail of the present invention in which the damper member is disposed does not change significantly even when reaching the same specific section as the section.

Here, the specific section may be an engine start-up ON state.

As a result of the above experiment, it can be seen that the fuel rail of the present invention in which the damper member 300 is disposed between the high pressure sensor 200 and the boss part 140 has reduced vibration compared to the conventional fuel rail without the damper member 300 . can

Therefore, the vibration transmitted to the high-pressure sensor 200 fixed to the body part 100 in the form of a cantilever is reduced, thereby effectively reducing the error and damage of the sensing function of the high-pressure sensor 200 .

Meanwhile, the mass portion of the damping member according to another embodiment of the present invention may be formed in a sawtooth shape.

Hereinafter, a damping member according to another embodiment of the present invention will be described with reference to the drawings.

9 is a perspective view showing a damper member of a fuel rail according to another embodiment of the present invention.

Referring to FIG. 9 , the damping member 400 according to another embodiment of the present invention includes a transmission unit 410 and a mass unit 420 .

The transmission part 400 is composed of a pair of O-ring parts and a connection part, and the pair of O-ring parts are spaced apart from each other at a distance in one direction and the other direction, and the connection part 411 interconnects the pair of spaced O-ring parts. .

In addition, the O-ring part disposed in one direction is in contact with the boss part 140 of the body part 100 , and the O-ring part disposed in the other direction is in contact with the support part 230 of the high-pressure sensor 200 .

This transfer unit 410 may be made of a RUBBER material.

The mass portion 420 is made of a metal material such as steel, is formed in the shape of a cog wheel (COGWHEEL), and is coupled to the outer circumferential surface of the transmission unit 410 .

Specifically, the mass part 420 is sandwiched between a pair of O-ring parts, and is in contact with the outer circumferential surface of the connection part 411 .

That is, the mass unit 420, the area coupled to the transmission unit 410 vibrates in the same direction as the vibration direction of the transmission unit 410, and the remaining radial sawtooth area except for the area coupled to the transmission unit 410 is free oscillation.

In particular, the mass portion 420 of the damper member 400 according to another embodiment of the present invention has a different number of teeth, so that the resonance frequency of the damper member 400 and the resonance frequency of the common rail system are easily matched with each other. can be designed

Meanwhile, the damping member according to another embodiment of the present invention may include a flexible wire part.

10 is a plan view showing a damper member of a fuel rail according to another embodiment of the present invention.

Referring to FIG. 10 , the damping member 500 according to another embodiment of the present invention includes a transmission unit 510 , a wire unit 520 , and a mass unit 530 .

One surface of the transmission unit 510 is in contact with the boss unit 140 of the body unit 100 , and the other surface is in contact with the support unit 230 of the high-pressure sensor 200 .

The transfer unit 510 may be made of a metal material such as steel.

The wire unit 520 is made of a metal material such as steel, is made of a plurality of pieces along the circumference of the transmission unit 510 , and extends outwardly from the circumference of the transmission unit 510 .

That is, the damper member 500 according to another embodiment of the present invention is formed in a radial shape.

The mass unit 530 is made of a metal material such as steel, is formed in a sphere (SPHERE) shape, and is coupled to the end of the wire unit 520 .

Accordingly, the mass unit 530 has the same number as the wire unit 520 .

That is, the wire unit 520 and the mass unit 530 vibrate in the same direction as the vibration direction of the transmission unit 510 in a region coupled to the transmission unit 510 , and a region coupled to the transmission unit 510 is formed. Except for the rest of the radial region, it oscillates freely.

In the damper member 500 according to another embodiment of the present invention, the resonant frequency of the damper member 500 and the resonant frequency of the common rail system are mutually different by varying the number of the wire part 520 and the mass part 530 . It can be easily designed to match.

In particular, since the transfer unit 510 and the mass unit 530 of the damper member 500 according to another embodiment of the present invention are connected by a flexible wire unit 520, the mass unit 530 even with relatively low vibration. ) can be easily bent to effectively reduce the vibration of the transmission unit 510 .

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical spirit of the present invention.

100: body part 110: flow path part
120: fuel pump connection 130: injector connection
140: boss 200: high pressure sensor
210: sensor body 211: suction hole
220: sensor element 230: support
240: housing 300, 400, 500: damper member
310, 410, 510: transmission part 311, 411: connection part
320, 420, 530: mass unit 520: wire unit

Claims (9)

In the fuel rail constituting the common rail system,
a body part mounted on the engine block and distributing the high-pressure fuel compressed by the high-pressure fuel pump from the injector;
a high pressure sensor coupled to the main body to measure the pressure of the main body; and
and a damper member coupled between the main body and the high-pressure sensor to reduce vibration transmitted from the engine block to the high-pressure sensor,
The damper member is
Vibrating out of phase with the vibration of the common rail system
in fuel rail.
According to claim 1, wherein the body portion,
a flow passage in which the fuel supplied from the high-pressure fuel pump is stored;
a fuel pump connection unit coupled to a high-pressure fuel pump that protrudes outward from the outer circumferential surface and pumps fuel compressed at high pressure;
a plurality of injector connection parts spaced apart from the fuel pump connection part in a longitudinal direction from the outer circumferential surface at a predetermined interval and to which an injector for injecting fuel pumped from the high-pressure fuel pump to the outside is coupled to each other; and
Formed in a cantilever shape and including a boss to which the high-pressure sensor and the damper member are coupled
in fuel rail.
According to claim 1, wherein the high pressure sensor,
a sensor body having a suction hole through which fuel is introduced;
a sensor element disposed at one end of the sensor body;
a support part fixed to one surface of the sensor body to contact the damper member, and to which a printed circuit board is fixed;
A housing disposed on one surface of the support unit to conceal the sensor element and the printed circuit board.
in fuel rail.
delete According to claim 1, wherein the damper member,
a transmission part formed in a ring shape and in contact with the body part on one surface and the high-pressure sensor on the other surface; and
Formed in the shape of a washer (WASHER) comprising a mass portion coupled to the outer peripheral surface of the transfer unit
in fuel rail.
The method of claim 5, wherein the transmission unit,
A pair of O-ring parts spaced apart from each other in one direction and the other direction; and
and a connection part connecting between the pair of O-ring parts,
The mass part is coupled between a pair of the O-ring parts
in fuel rail.
7. The method of claim 6,
The thickness of the mass part is thicker than or equal to the width of the connection part
in fuel rail.
According to claim 1, wherein the damper member,
a transmission part formed in a ring shape and in contact with the body part on one surface and the high-pressure sensor on the other surface; and
Formed in the shape of a cogwheel (COGWHEEL) and comprising a mass portion coupled to the outer peripheral surface of the transmission unit
in fuel rail.
According to claim 1, wherein the damper member,
a transmission part formed in a ring shape and in contact with the body part on one surface and the high-pressure sensor on the other surface;
a wire part formed in plurality along the circumference of the delivery part and extending from the delivery part; and
Formed in a sphere (SPHERE) shape and comprising a mass portion coupled to the end of the wire portion
in fuel rail.

Images