JP2015151881A - fuel rail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel rail capable of securing support rigidity of a boss part for attaching a fuel pressure sensor with a simple configuration without complicating the configuration.SOLUTION: A fuel rail includes; a pipe body 11 having a fuel passage 12 through which pressurized fuel is supplied from a fuel supply source; a first fixing bracket 20 in which an injector attachment part 22 joined to an outer peripheral surface of the pipe body 11 and a fixing boss part 24 are integrally formed; and a second fixing bracket 30 in which a boss part 35 for attaching a fuel pressure sensor, and a fixing boss part 40 are integrally formed on a bottomed cylindrical housing body 31 having a pipe holding hole 32 into which one end of the pipe body 11 can be inserted. The pipe body 11 is held by the first fixing bracket 20 and the second fixing bracket 30, and rigidity of the fuel rail 1 can be secured. The fixing boss part 40 for attachment to an engine body and the boss part 35 for attaching the fuel pressure sensor are integrally formed in the second fixing bracket 30, and support rigidity of the boss part 35 for attaching the fuel pressure sensor is improved.

Description

  The present invention relates to a fuel rail that supplies fuel to each cylinder of an engine.

  2. Description of the Related Art Conventionally, in an engine, a fuel rail that distributes fuel supplied from a fuel supply source to a plurality of injectors arranged in each cylinder has been used.

  The engine equipped with this fuel rail stores the fuel pressurized and supplied by the fuel pump as a fuel supply source in the fuel rail, and the high-pressure fuel stored in the fuel rail with the valve opening operation of each injector, Injection is performed from the opened injector toward the combustion chamber. The fuel rail is provided with a fuel pressure sensor that detects the pressure of the fuel supplied to the injector.

  For example, as shown in FIG. 8, the fuel rail 101 disclosed in Patent Document 1 includes a pipe body 102 in which a fuel passage is formed and a plurality of injector mounting portions 103 are formed on an outer peripheral surface. A fuel introduction adapter 104 to which a fuel pipe for supplying fuel from a fuel pump is connected is formed at one end of the pipe body 102, and a fuel pressure sensor mounting boss 105 for mounting a fuel pressure sensor is formed at the other end. The

  The fuel rail 101 includes a hollow pipe-shaped pipe main body 102, a plurality of injector mounting portions 103 provided on the pipe main body 102, a fuel introduction adapter 104 provided at one end of the pipe main body 102, and the other end of the pipe main body 102. The fuel pressure sensor mounting boss portion 105 provided in is integrally formed by pressing from one pipe steel material.

JP 2012-107544 A

  According to the fuel rail 101 disclosed in Patent Document 1, a pipe main body 102 having a hollow tube shape, an injector mounting portion 103, a fuel introduction adapter 104 provided at both ends of the pipe main body 102, and a fuel pressure sensor mounting boss portion 105 are arranged in one. By integrally forming by press working from the pipe steel material of the book, there is no welded portion, and it is possible to prevent spatter from entering inside during welding.

  However, since the fuel pressure sensor is mounted on the fuel pressure sensor mounting boss 105 formed at one end of the pipe body 102, the fuel pressure sensor is mounted due to vibration of the pipe body 102 caused by vibration of the engine body on which the fuel rail 101 is mounted and supported. The boss portion 105 for vibration vibrates greatly, and the fuel pressure sensor attached to the fuel pressure sensor mounting boss portion 105 vibrates. There is a concern that the vibration of the fuel pressure sensor may cause an abnormality such as a disconnection between a terminal provided on the fuel pressure sensor and the harness, and the failure of ensuring the intended function of the fuel pressure sensor. In addition, since a pipe steel material is pressed to form the fuel introduction adapter 104, the fuel pressure sensor mounting boss 105, and the like, the shape of the pipe body 102, etc. is complicated, and the volume and shape of the fuel passage are limited. Is done.

  On the other hand, in order to increase the support rigidity of the fuel pressure sensor mounting boss portion 105, if the pipe body 102 is thickened, the weight increases and press working becomes difficult, and a rib or a reinforcing member is added to the pipe body 102. However, there is concern about an increase in weight as it becomes complicated.

  Accordingly, an object of the present invention made in view of such a point is to provide a fuel rail capable of ensuring the supporting rigidity of the fuel pressure sensor mounting boss portion with a simple configuration without complicating the configuration.

  The fuel rail according to claim 1, which achieves the above object, includes a pipe body provided with a fuel passage to which pressurized fuel is supplied from a fuel supply source, and an injector mounting portion for mounting the injector in communication with the fuel passage. A fuel pressure sensor mounting boss portion that communicates with the fuel passage and mounts a fuel pressure sensor; and a fixing boss portion that is joined to the pipe body and has a boss hole for mounting the pipe body to the engine body. A fuel rail comprising a mounting bracket, wherein the fuel pressure sensor mounting boss portion is formed integrally with at least one of the plurality of fixing brackets.

  According to this, the fixing boss part to be mounted on the engine body and the fuel pressure sensor mounting boss part for mounting the fuel pressure sensor are integrally formed on the fixing bracket, so that the fuel pressure sensor mounting boss part has a simple configuration with few components. Thus, the vibration of the fuel pressure sensor mounting boss is suppressed, the vibration of the fuel pressure sensor mounted on the fuel pressure sensor mounting boss is avoided, and the desired stable function of the fuel pressure sensor can be maintained. Further, as the number of components is reduced, the number of joints is reduced, and the manufacturing can be simplified.

  According to a second aspect of the present invention, in the fuel rail according to the first aspect, the fuel pressure sensor mounting boss portion and the injector mounting portion are formed integrally with the fixing bracket.

  According to this, since the fixing boss portion and the injector mounting portion are integrally formed, in addition to the first aspect, the configuration can be further simplified and the rigidity of the injector mounting portion can be secured. Furthermore, the accuracy between the fixing boss portion and the injector mounting portion is improved.

  According to a third aspect of the present invention, in the fuel rail of the second aspect, the fixing bracket includes a bottomed cylindrical housing body having a pipe holding hole into which an end of the pipe body can be fitted, and the housing body. The fuel pressure sensor mounting boss formed on the outer peripheral surface of the housing and the fixing boss having a boss hole provided in the housing are integrally formed.

  According to this, it is a simple structure which joins the fixing bracket in which the housing main body, the fuel pressure sensor mounting boss portion, and the fixing boss portion are integrally formed at the end portion of the pipe main body, and the pipe main body has a rigid fixing bracket. Thus, the rigidity of the fuel rail can be ensured, and the rigidity of the fuel pressure sensor mounting boss can be secured, so that the stable function of the fuel pressure sensor attached to the fuel pressure sensor mounting boss can be maintained.

  According to a fourth aspect of the present invention, in the fuel rail of the second aspect, the fixing bracket has a bottomed cylindrical housing main body having a pipe holding hole into which an end of the pipe main body can be fitted, and the housing main body. The fuel pressure sensor mounting boss formed on the outer peripheral surface, the fixing boss having a boss hole provided in the housing, and the injector mounting portion are integrally molded.

  According to this, it is a simple structure in which a fixing bracket in which a housing main body, a fuel pressure sensor mounting boss portion, an injector mounting portion, and a fixing boss portion are integrally formed is joined to an end portion of the pipe main body, and the pipe main body has rigidity. The rigidity of the fuel rail can be secured by being held by the fixing bracket, and the rigidity of the fuel pressure sensor mounting boss and the injector mounting part is secured, so that the fuel pressure sensor and the injector mounting part mounted on the fuel pressure sensor mounting boss The stable function of the installed injector can be maintained.

  According to the present invention, the fixing boss portion to be attached to the engine body and the fuel pressure sensor attachment boss portion to which the fuel pressure sensor is attached are formed integrally with the fixing bracket, so that the structure can be simplified and the fuel pressure sensor attachment boss can be obtained. The rigidity of the portion is increased, the vibration of the fuel pressure sensor mounting boss portion is suppressed, and the stable function of the fuel pressure sensor attached to the fuel pressure sensor mounting boss portion can be maintained.

It is a side view which shows the outline | summary of the fuel rail in one Embodiment. It is a bottom view of a fuel rail. It is a perspective view of the 2nd fixed bracket. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. It is a schematic explanatory drawing of the conventional fuel rail.

  Hereinafter, an embodiment of the present invention using a fuel rail will be described with reference to FIGS. 1 to 7 by taking as an example the case of distributing fuel to two cylinders.

  FIG. 1 is a side view showing an outline of the fuel rail 1, FIG. 2 is a bottom view of the fuel rail 1, and FIG. 3 is a perspective view of a second fixing bracket 30. 4 to 7 are sectional views taken along lines IV-IV, VV, VI-VI, and VII-VII in FIG. 1, respectively.

  As shown in FIG. 1, the fuel rail 1 includes a pipe main body 11, a fuel introduction adapter 15 protruding from the outer peripheral surface of the pipe main body 11, a first fixing bracket 20 and a pipe provided on the outer peripheral surface of the pipe main body 11. It has a fixing bracket for the second fixing bracket 30 provided at the end of the main body 11. In FIG. 1, the head portion 50 of the engine body to which the fuel rail 1 is attached is indicated by a virtual line. The head portion 50 is formed with a first injector mounting hole 51a, a second injector mounting hole 51b, a first mounting boss portion 52a, and a second mounting boss portion 52b into which an injector (not shown) is inserted corresponding to each cylinder. Is done.

  The pipe body 11 is made of steel or stainless steel and has a hollow circular tube shape with a fuel passage 12 formed therein, and one end 11a is closed with an end cap 13 which is a closing member.

  A fuel introduction adapter 15 to which a fuel pipe for supplying pressurized fuel from the fuel pump is connected is provided on the outer peripheral surface of the central portion in the longitudinal direction of the pipe body 11. As shown in FIGS. 1 and 4, the fuel introduction adapter 15 has a nipple pipe shape, and a base end formed in a concave shape along the outer peripheral surface of the pipe main body 11 is fitted to the outer peripheral surface of the pipe main body 11. They are joined by welding or brazing. The fuel introduction adapter 15 communicates with the fuel passage 12 via a branch passage 12 a drilled in the pipe body 11.

  Near the one end 11a of the pipe body 11, a first fixing bracket 20 is provided on the outer peripheral surface. As shown in FIGS. 1, 2, and 5, the first fixing bracket 20 includes a plate-like stay 21 in which a first injector mounting portion 22 and a first fixing boss portion 24 are integrally formed, and a first injector. A base end of the injector housing 26 that is continuously formed on the mounting portion 22 and is integrally formed with a known processing method such as forging or casting, and is formed in a concave shape along the outer peripheral surface of the pipe body 11. Are joined to the outer peripheral surface of the pipe body 11 by welding or brazing.

  As shown in FIGS. 2 and 5, the first injector mounting portion 22 formed on the stay 21 has a bottomed cylindrical injector mounting hole that has a flange portion that projects annularly from the mounting surface 21 a of the stay 21. 23, and the bottom of the injector mounting hole 23 communicates with the fuel passage 12 through a fuel supply hole 23 a formed through the injector housing 26 and a branch passage 12 b drilled in the pipe body 11. The first fixing boss portion 24 has a boss hole 25 as shown in FIGS. The injector mounting hole 23, the fuel supply hole 23a, the mounting surface 21a of the stay 21 and the like are finished by machining.

  A second fixing bracket 30 is connected to the other end 11 b of the pipe body 11. As shown in the perspective view of FIG. 3, the second fixing bracket 30 includes a bottomed cylindrical pipe holding hole 32 into which the other end 11 b which is the end of the pipe body 11 can be fitted, and a bottom portion 32 a of the pipe holding hole 32. A substantially bottomed cylindrical housing body 31 having a bottomed branch passage 33 projecting from the bottom, a fuel pressure sensor mounting boss 35 projecting cylindrically from the outer peripheral surface of the housing body 31, and a second injector mounting section 38. And a plate-like stay 37 in which the second fixing boss 40 is integrally formed, and an injector housing 42 which is continuously formed on the second injector mounting portion 38 and continues to the outer peripheral surface of the housing body 11 are integrally formed.

  As shown in FIGS. 1 and 7, the fuel pressure sensor mounting boss 35 has a bottomed cylindrical shape having a fuel pressure sensor mounting hole 36 to which a fuel pressure sensor (not shown) is mounted on the inner periphery. The bottom communicates with the branch passage 33 through the supply path 36a.

  As shown in FIGS. 1, 2, and 7, the injector mounting portion 38 formed on the stay 37 is a bottomed cylindrical injector that has a flange portion that projects annularly from the mounting surface 37 a of the stay 37 and opens. The injector mounting hole 39 has a mounting hole 39, and the bottom of the injector mounting hole 39 communicates with the branch passage 33 through a fuel supply hole 39 a formed through the injector housing 42. The second fixing boss portion 40 has a boss hole 41 as shown in FIGS. 2 and 6.

  A pipe holding hole 32 formed in the housing main body 31 is fitted to the other end 11b of the pipe main body 11, and the pipe main body 11 and the pipe holding hole 32 are connected by welding or brazing.

  In the fuel rail 1 configured as described above, injectors (not shown) are respectively attached to the first injector mounting portion 23 formed on the first fixing bracket 20 and the second injector mounting portion 38 of the second fixing bracket 30. In addition, the fuel pressure sensor is liquid-tightly attached to the fuel pressure sensor mounting boss portion 35 of the second fixing bracket 30 with a gasket or the like.

  The first injector mounting portion 23 formed with the stay 21 of the first fixing bracket 20 is fitted into the first injector mounting hole 51a of the head portion 50, and the first fixing boss portion 24 is connected to the first mounting boss portion 52a. Then, a fixing tool such as a bolt is inserted into the boss hole 25 of the first fixing boss part 24, and the fixing tool is inserted and fixed into the mounting hole 53 a of the first mounting boss part 52 a of the head part 50. Similarly, the second injector mounting portion 38 formed with the stay 37 of the second fixing bracket 30 is fitted into the second injector mounting hole 51b, and the second fixing boss portion 40 is contacted with the second mounting boss portion 52b. The second injector mounting portion 38 of the second fixing bracket 30 is fitted into the second injector mounting hole 51b, and the second fixing boss portion 40 is brought into contact with the second mounting boss 52b so as to be in contact with the boss hole 41. A fixing tool such as a bolt is inserted, and the fixing tool is inserted and fixed in the mounting hole 53b of the second mounting boss portion 52b of the head unit 50, whereby the fixing unit is fixed to the head unit 50 of the engine body.

  In the fuel rail 1 configured as described above, the fuel passage 12 of the pipe body 11 provided with the fuel introduction adapter 15 is integrally formed with the first fixing bracket 20 by the branch passage 12a and the fuel supply hole 23a. It communicates with the injector mounting portion 22. The fuel passage 12 of the pipe body 11 communicates with a second injector mounting portion 38 in which the fuel passage 12 is integrally formed with the second fixing bracket 30 by the branch passage 33 and the fuel supply hole 39a of the second fixing bracket 30. Further, the fuel pressure sensor mounting boss portion 35 communicates with the branch passage 33 and the supply passage 36a.

  The fuel that has flowed into the fuel passage 12 of the pipe body 11 from the fuel introduction adapter 15 through the fuel pipe from the fuel pump, which is a fuel supply source, passes through the branch passage 12 a and the fuel supply hole 23 a of the first fixing bracket 20. It is sent to the injector mounting portion 22 and is sent from the branch passage 33 and the fuel supply hole 39a of the second fixing bracket 30 to the second injector mounting portion 38, and to each of the first injector mounting portion 22 and the second injector mounting portion 38. It is injected from each installed injector into each combustion chamber. On the other hand, the fuel pressure in the fuel passage 12 serving as the fuel pressure supplied to the injector is detected by a fuel pressure sensor attached to a fuel pressure sensor mounting boss 35 formed integrally with the second fixing bracket 30.

  In the fuel rail 1 configured as described above, the fuel introduction adapter 15 is provided in the pipe body 11 whose one end is closed by the end cap 13, and the first injector attachment portion 22 and the first fixing are provided on the outer peripheral surface of the pipe body 11. The first fixing bracket 20 integrally formed with the boss portion 24 is joined, and the housing body 31, the second injection mounting portion 38, the second fixing boss portion 40, and the fuel pressure sensor mounting are attached to the other end 11b of the pipe body 11. The first fixing bracket 20 and the second fixing bracket 30 have a simple configuration in which the second fixing bracket 30 integrally formed with the boss portion 35 is joined, the number of components is small, and the pipe body 11 has sufficient rigidity. The rigidity of the fuel rail 1 can be secured by being held.

  In particular, since the second fixing boss portion 40 to be attached to the head portion 50 of the engine body and the fuel pressure sensor attaching boss portion 35 to which the fuel pressure sensor is attached are integrally formed with the second fixing bracket 30, the pipe described in the above prior art The support rigidity of the fuel pressure sensor mounting boss portion 35 is higher than that provided with the fuel pressure sensor mounting boss portion at the end of the main body, and the vibration of the fuel pressure sensor mounting boss portion 35 is suppressed, so that the fuel pressure sensor mounting boss portion is suppressed. The vibration of the fuel pressure sensor attached to the portion 35 is avoided, and abnormal situations such as disconnection between the terminals provided on the fuel pressure sensor and the harness are prevented, and the expected stable function of the fuel pressure sensor can be maintained.

  By integrally forming the fixing boss portion 40 and the second injector attachment portion 38, the support rigidity of the second injector attachment portion 38 is improved, and the stable function of the injector attached to the second injector attachment portion 38 is improved. Can be maintained. Furthermore, the precision between the 2nd fixing boss | hub part 40 and the 2nd injector attachment part 38 can be made high.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, although the fuel pressure sensor mounting boss 35 is formed on the second fixing bracket 30 in the above embodiment, the fuel pressure sensor mounting boss 35 can be formed integrally with the first fixing bracket 20.

  In the above embodiment, one end 11 a of the pipe body 11 is closed with the end cap 13, and the fuel introduction adapter 15 is disposed at the center in the longitudinal direction of the pipe body 11, but the end cap 13 is replaced with the pipe body 11. A fuel introduction adapter 15 can also be provided.

  In the above description, an example in which fuel is distributed to two cylinders has been described. However, fuel can be distributed to other cylinders. Furthermore, although the case where the two fixing brackets of the first fixing bracket and the second fixing bracket are provided has been described, other plural fixing brackets may be provided. In this case, the fuel pressure sensor mounting boss is integrally formed with at least one of the plurality of fixing brackets.

DESCRIPTION OF SYMBOLS 1 Fuel rail 11 Pipe main body 12 Fuel passage 15 Fuel introduction adapter 20 1st fixing bracket (fixing bracket)
22 First injector mounting part (injector mounting part)
23 Injector mounting hole 24 First fixing boss (fixing boss)
26 Injector housing 30 Second fixing bracket (fixing bracket)
31 Housing Body 32 Pipe Holding Hole 35 Fuel Pressure Sensor Mounting Boss 38 Second Injector Mounting Portion (Injector Mounting Portion)
40 Second fixing boss (fixing boss)
43 Injector housing

Claims (4)

A pipe body having a fuel passage to which pressurized fuel is supplied from a fuel supply source, an injector mounting portion for mounting the injector in communication with the fuel passage, and a fuel pressure sensor in communication with the fuel passage. In a fuel rail comprising a fuel pressure sensor mounting boss, and a fixing bracket having a fixing boss that is joined to the pipe body and has a boss hole for mounting the pipe body to the engine body,
The fuel rail, wherein the fuel pressure sensor mounting boss is integrally formed with at least one of the plurality of fixing brackets.   2. The fuel rail according to claim 1, wherein the fuel pressure sensor mounting boss portion and the injector mounting portion are formed integrally with the fixing bracket. 3. The fixing bracket is
A bottomed cylindrical housing body having a pipe holding hole into which an end of the pipe body can be fitted;
The fuel pressure sensor mounting boss formed on the outer peripheral surface of the housing body;
The fuel rail according to claim 1, wherein a fixing boss portion having a boss hole provided in the housing is integrally formed. The fixing bracket is
A bottomed cylindrical housing body having a pipe holding hole into which an end of the pipe body can be fitted;
The fuel pressure sensor mounting boss formed on the outer peripheral surface of the housing body;
A fixing boss portion having a boss hole provided in the housing;
The fuel rail according to claim 2, wherein the injector mounting portion is integrally formed.

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