JP2006083802A - Fuel injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection device capable of reducing operation sound and vibration leaking to the outside. <P>SOLUTION: The operation sound and vibration caused by collision of a needle 25 and a valve body 21 and collision of a movable core 35 and a fixed core 34 are transmitted to a fuel introducing port 15 side through fuel flowing in a fuel passage 41. The operation sound and vibration to be transmitted pass through a vibration absorbing member 50 provided in the fuel passage 41 to absorb its energy by the vibration absorbing member 50. Consequently, the operation sound and vibration transmitted through fuel flowing in the fuel passage 41 are damped to reduce noise discharged to the outside through a storage pipe 11 from the fuel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel injection device that injects fuel into an internal combustion engine (hereinafter, the internal combustion engine is referred to as an “engine”).

  Conventionally, a fuel injection device that electromagnetically drives a needle is known. In such a fuel injection device, the needle and the movable core integrally reciprocate in the axial direction. When the coil is energized, a magnetic attractive force is generated between the fixed core and the movable core. Thereby, the integral movable core and needle move to the fixed core side. On the other hand, when energization of the coil is stopped, the integral movable core and needle move to the opposite side to the fixed core, that is, the valve seat side by an elastic member such as a spring (see Patent Document 1).

JP-A-2-195084

  However, when the coil is energized, the integral movable core and needle are attracted to the fixed core side. Therefore, the needle or the movable core collides with a stopper or a fixed core that restricts movement. Further, when energization of the coil is stopped, the integral movable core and needle are pressed against the valve seat side. Therefore, the seal part of the needle collides with the valve seat. As a result, the integral movable core and the needle repeatedly collide with the stopper or the valve seat due to intermittent energization of the coil. As a result, operating noise and vibration leaking to the outside increase.

  Accordingly, an object of the present invention is to provide a fuel injection device in which operating noise and vibration leaking to the outside are reduced.

  According to the first aspect of the present invention, the vibration absorbing member is installed on the upstream side of the fuel flow of the stopper. The operation sound and vibration generated by the collision between the movable core or needle and the stopper or the valve seat propagate through the fuel passage to the upstream side of the fuel flow. The propagated operation sound and vibration propagate to the air around the fuel injection device through the housing forming the fuel passage. As a result, the operating noise and vibration leak outside the fuel injection device. According to the first aspect of the present invention, the fuel passage is provided with a vibration absorbing member. Thereby, the operating sound and vibration propagating through the fuel passage are attenuated by the vibration absorbing member before leaking to the outside. Accordingly, it is possible to reduce operating noise and vibration that leak to the outside.

  Conventionally, a buffer member for reducing operating noise and vibration leaking to the outside is installed between the fuel injection device and, for example, an engine peripheral device that holds the fuel injection device. Therefore, it is necessary to secure a space for installing the buffer member around the engine or the engine. In the first aspect of the invention, by providing the vibration absorbing member, the fuel injection device reduces operating noise and vibration leaking to the outside alone. Therefore, for example, it is not necessary to install a buffer member between the fuel injection device and the engine peripheral device. Therefore, it is possible to reduce the operating sound and vibration leaking to the outside without increasing the physique associated with securing the space and complicating the structure.

In the invention described in claim 2, the vibration absorbing member is installed inside the housing that defines the fuel passage. Therefore, the operation sound and vibration propagating through the fuel passage are attenuated by the vibration absorbing member. Accordingly, it is possible to reduce operating noise and vibration that leak to the outside.
In the invention according to claim 3, the filter is provided with a vibration absorbing member. 2. Description of the Related Art Conventionally, a fuel injection device includes a filter that collects foreign matters in fuel at a fuel introduction port. In the invention according to claim 3, the filter is provided with a vibration absorbing member. Therefore, the filter functions not only as a filter that collects foreign substances contained in the fuel, but also as a vibration absorbing member. Therefore, the structure can be simplified without increasing the number of parts. Further, the filter is not limited to the fuel inlet through which the fuel flows, and can be installed at any part of the housing.

According to a fourth aspect of the present invention, the vibration absorbing member is installed in a delivery pipe that supplies fuel to the fuel inlet of the housing. The vibration absorbing member may be installed at any position on the upstream side of the fuel flow with respect to the generation source of the operation sound and vibration as long as the operation sound and vibration can be attenuated before leaking to the outside. Therefore, a vibration absorbing member may be installed on the delivery pipe. Thereby, the operation sound and vibration propagating through the fuel passage are attenuated by the vibration absorbing member. Therefore, it is possible to reduce operating noise and vibration that leak to the outside through the delivery pipe.
In the invention according to claim 5, the vibration absorbing member has a fuel hole. The vibration absorbing member is installed in the fuel passage. Therefore, the fuel flowing through the fuel passage passes through the fuel hole of the vibration absorbing member. Therefore, even if the vibration absorbing member is installed in the fuel passage, the fuel flow in the fuel passage can be allowed.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
The injector which comprises the fuel-injection apparatus by 1st Embodiment of this invention is shown in FIG. 1 and FIG. The injector 10 according to the first embodiment injects fuel into, for example, intake air sucked into a combustion chamber of a gasoline engine. The injector 10 may be applied to a direct-injection gasoline engine that directly injects fuel into a combustion chamber of a gasoline engine, or a diesel engine. The fuel injection device includes an injector 10 and a delivery pipe (not shown) that supplies fuel to the injector 10.

  The accommodation pipe 11 of the injector 10 is formed in a thin cylindrical shape. The accommodation pipe 11 has a first magnetic part 12, a nonmagnetic part 13, and a second magnetic part 14. The nonmagnetic part 13 prevents a magnetic short circuit between the first magnetic part 12 and the second magnetic part 14. The housing pipe 11 has a fuel inlet 15 at one end. The fuel inlet 15 is supplied with fuel from a fuel pump (not shown). The fuel supplied to the fuel introduction port 15 flows into the fuel passage 41 on the inner peripheral side of the accommodation pipe 11 via the filter 16. The filter 16 is installed at the end of the accommodation pipe 11 and removes foreign matters contained in the fuel.

  A nozzle 20 is installed on the opposite side of the housing pipe 11 from the fuel inlet 15, that is, on the tip of the first magnetic part 12. The nozzle 20 has a valve body 21 and a nozzle hole plate 22. The valve body 21 is formed in a substantially cylindrical shape and is fixed to the inner peripheral side of the first magnetic part 12. The valve body 21 has an opening 21 a at the tip, that is, the end opposite to the fuel introduction port 15. The valve body 21 has a valve seat 23 on a conical inner wall whose inner diameter decreases as it approaches the opening 21a. The valve body 21 has a nozzle hole plate 22 at the end opposite to the housing pipe 11. The nozzle hole plate 22 has a nozzle hole 24 that communicates the inner wall on the valve seat 23 side and the outer wall on the opposite side of the valve seat 23.

  The needle 25 is accommodated on the inner peripheral side of the first magnetic part 12 and the valve body 21 so as to be capable of reciprocating in the axial direction. The needle 25 is disposed substantially coaxially with the accommodating pipe 11 and the valve body 21. The needle 25 has a seal portion 26 in the vicinity of the end portion on the nozzle hole plate 22 side. The seal portion 26 can be seated on a valve seat 23 formed on the valve body 21. The needle 25 forms a fuel passage 27 through which fuel flows between the needle body 25 and the valve body 21. The fuel passage 27 communicates with the injection hole 24 when the seal portion 26 of the needle 25 is separated from the valve seat 23. In the case of this embodiment, the needle 25 is formed in a cylindrical shape. The needle 25 forms a fuel passage 42 on the inner peripheral side. The needle 25 has a hole 251 and a hole 252 that connect the fuel passage 42 and the fuel passage 27. The needle 25 is not limited to a cylindrical shape, and may be a solid column shape.

  The injector 10 has a drive unit 30 that drives the needle 25. The drive unit 30 is an electromagnetic drive unit. The drive unit 30 includes a coil 31, a plate plate 32, a holder 33, a fixed core 34, and a movable core 35. The plate 32 and the holder 33 are made of a magnetic material. The plate 32 covers the outer peripheral side of the coil 31. The holder 33 is disposed on the outer peripheral side of the housing pipe 11 and holds the coil 31 from the nozzle hole 24 side. The plate 32 and the holder 33 are made of a magnetic material and are magnetically connected. The outer peripheral side of the coil 31, the plate 32, the holder 33 and the housing pipe 11 is covered with a resin mold 36. The coil 31 is electrically connected to a terminal 39 installed on the connector 38 via a wiring member 37. The cylindrical accommodation pipe 11, the valve body 21, the drive unit 30 installed on the outer peripheral side thereof, the resin mold 36 covering these, and the like are housings that define fuel passages therein.

  The fixed core 34 is fixed to the inner peripheral side of the coil 31 with the accommodation pipe 11 interposed therebetween. The fixed core 34 is formed in a substantially cylindrical shape by a magnetic material such as iron. The fixed core 34 forms a fuel passage 43 on the inner peripheral side. The fixed core 34 is installed with a predetermined gap between the fixed core 34 and the movable core 35. The gap between the fixed core 34 and the movable core 35 corresponds to the lift amount of the needle 25.

  The movable core 35 is accommodated on the inner peripheral side of the accommodation pipe 11. The movable core 35 can reciprocate in the axial direction on the inner peripheral side of the housing pipe 11. The end of the movable core 35 opposite to the injection hole 24 faces the fixed core 34. The movable core 35 is formed in a substantially cylindrical shape from a magnetic material such as iron. The movable core 35 forms a fuel passage 44 on the inner peripheral side. The end of the needle 25 opposite to the seal portion 26 is fixed to the inner peripheral side of the movable core 35. Thereby, the needle 25 and the movable core 35 are reciprocated in the axial direction together.

  The integral needle 25 and the movable core 35 are restricted from moving toward the injection hole 24 when the seal portion 26 is seated on the valve seat 23. Further, when the integral needle 25 and the movable core 35 move to the side opposite to the injection hole 24, the movable core 35 contacts the fixed core 34. Thereby, the movement of the integral needle 25 and the movable core 35 toward the fixed core 34 is restricted. Therefore, the fixed core 34 is a stopper that restricts the movement of the integral needle 25 and the movable core 35 toward the fixed core 34.

  The movable core 35 is in contact with the spring 17 as an elastic member. The elastic member is not limited to the spring 17 and can be applied as long as it has elasticity, such as a leaf spring, an oil damper, or an air damper. The spring 17 has one end in the axial direction in contact with the movable core 35 and the other end in contact with the adjusting pipe 18. The adjusting pipe 18 is fixed to the inner peripheral side of the fixed core 34. The spring 17 has a force that extends in the axial direction. Therefore, the spring 17 whose one end is fixed presses the integral needle 25 and the movable core 35 toward the valve seat 23 on the other end side. The load of the spring 17 is adjusted by the amount of press fitting of the adjusting pipe 18 to the fixed core 34. When the coil 31 is not energized, the integral needle 25 and the movable core 35 are pressed against the valve seat 23 side. As a result, the seal portion 26 is seated on the valve seat 23. The adjusting pipe 18 is formed in a substantially cylindrical shape. The adjusting pipe 18 forms a fuel passage 45 on the inner peripheral side.

  The fuel flowing into the filter 16 from the fuel inlet 15 forms a fuel passage 41 formed by the accommodation pipe 11, a fuel passage 45 formed by the adjusting pipe 18, a fuel passage 43 formed by the fixed core 34, and a movable core 35. The fuel flows into the fuel passage 27 through the fuel passage 44, the fuel passage 42 of the needle 25, the hole 251 and the hole 252.

  The injector 10 includes a vibration absorbing member 50. The vibration absorbing member 50 is formed in a disc shape. The vibration absorbing member 50 is made of, for example, a metal such as stainless steel, aluminum, or iron, a synthetic resin such as a polyamide resin or a polyacetal resin, or rubber. Since the vibration absorbing member 50 is exposed to fuel, a material having oil resistance is suitable. Moreover, it is desirable that the vibration absorbing member 50 has high heat resistance. The vibration absorbing member 50 is installed on the inner peripheral side of the housing pipe 11 that forms the fuel passage 41. Accordingly, the vibration absorbing member 50 is installed on the side opposite to the injection hole 24 of the fixed core 34 that is a stopper. In the vibration absorbing member 50, the outer peripheral wall 51 is in contact with the inner peripheral wall 11 a of the accommodation pipe 11. As a result, the vibration absorbing member 50 is held inside the accommodation pipe 11. Note that the vibration absorbing member 50 may be fixed to the inside of the housing pipe 11 by welding or bonding, for example.

  As shown in FIG. 3, the vibration absorbing member 50 has a fuel hole 52 through which fuel can pass on the inner peripheral side. One fuel hole 52 of the vibration absorbing member 50 may be provided near the center as shown in FIG. A plurality of fuel holes 52 may be provided as shown in FIG. 3 (B), FIG. 3 (C), or FIG. 3 (D). The shape and quantity of the fuel hole 52 can be arbitrarily selected so as to have a desired opening area according to the flow rate of the fuel.

  When energization of the coil 31 is stopped, no magnetic attractive force is generated between the fixed core 34 and the movable core 35. Therefore, the integral needle 25 and the movable core 35 are pressed against the valve body 21 by the spring 17. Thereby, the integral needle 25 and the movable core 35 move to the valve body 21 side, and the seal portion 26 is seated on the valve seat 23. As a result, the fuel passage 27 and the injection hole 24 are blocked from each other, and fuel is not injected from the injection hole 24.

  When the coil 31 is energized, a magnetic circuit is formed in the second magnetic part 14, the fixed core 34, the movable core 35, the first magnetic part 12, the holder 33 and the plate 32 by the generated magnetic field. Thereby, a magnetic attractive force is generated between the fixed core 34 and the movable core 35. Due to this magnetic attraction force, the movable core 35 is attracted to the fixed core 34 side. When the magnetic attraction force becomes larger than the pressing force of the spring 17, the integral needle 25 and the movable core 35 move to the fixed core 34 side. The integral needle 25 and the movable core 35 move toward the fixed core 34 until the movable core 35 contacts the fixed core 34. When the integral needle 25 and the movable core 35 move to the fixed core 34 side, the seal portion 26 moves away from the valve seat 23. As a result, the fuel passage 27 and the injection hole 24 communicate with each other through the opening 21a, and fuel is injected from the injection hole 24.

  When energization of the coil 31 is stopped, the magnetic attractive force between the fixed core 34 and the movable core 35 disappears. Therefore, the needle 25 and the movable core 35 are integrally pressed against the valve body 21 again by the spring 17. Thereby, the integral needle 25 and the movable core 35 move to the valve body 21 side. The integral needle 25 and the valve body 21 move to the valve body 21 side until the seal portion 26 is seated on the valve seat 23. When the seal portion 26 is seated on the valve seat 23, the fuel passage 27 and the injection hole 24 are blocked, and fuel is not injected from the injection hole 24.

  As described above, in the integral needle 25 and the movable core 35, the movable core 35 collides with the fixed core 34 by energizing the coil 31. The integral needle 25 and the movable core 35 collide with the valve body 21 when the energization of the coil 31 is stopped. Therefore, the integral needle 25 and the movable core 35 repeatedly collide with the valve body 21 or the fixed core 34 due to the intermittent energization of the coil 31.

  The operating sound and vibration generated by the collision between the needle 25 and the valve body 21 and the collision between the movable core 35 and the fixed core 34 are fuel that exists in contact with the needle 25, the valve body 21, the movable core 35, or the fixed core 34. Vibrate. As a result, the operating noise and vibration propagate to the upstream side, that is, the fuel inlet 15 side through the fuel flowing through the fuel passages of the respective parts. The operating sound and vibration propagated to the fuel inlet 15 side through the fuel in the fuel passage vibrate the housing pipe 11 that forms the fuel passage 41 and is in contact with the fuel. The vibration of the housing pipe 11 vibrates the air existing on the outer peripheral side of the housing pipe 11, that is, on the outside of the injector 10. Due to the vibration of the air outside the injector 10, noise is emitted to the outside of the injector 10 on the upstream side of the fuel flow with respect to the operating sound and the generation source of the vibration.

  When the vibration absorbing member 50 is installed in the fuel passage 41, the operating sound and vibration transmitted through the fuel flowing through the fuel passage 41 are propagated to the vibration absorbing member 50. The propagating operating sound and vibration pass through the vibration absorbing member 50, whereby the operating sound and vibration energy are absorbed by the vibration absorbing member 50. Thereby, the operation sound and vibration transmitted through the fuel flowing through the fuel passage 41 are attenuated. As a result, the vibration of the storage pipe 11 and the release of noise to the outside due to the vibration of the storage pipe 11 are reduced. Therefore, it is possible to reduce operating noise and vibration that leak to the outside of the injector 10.

  In addition, the injector 10 is provided with the vibration absorbing member 50 to reduce operating noise and vibration leaking to the outside alone. Therefore, for example, installation of a buffer member or the like is not required between the engine or the engine peripheral device on which the injector 10 is mounted. As a result, the space to be secured for mounting the injector 10 on the engine or the engine peripheral device is reduced. Therefore, the size of the physique around the engine can be reduced, and the leakage of the operating sound and vibration to the outside of the injector 10 can be reduced without complicating the structure and increasing the number of parts.

(Second Embodiment)
FIG. 4 shows a vibration absorbing member of an injector according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
As shown in FIG. 4, the vibration absorbing member 60 has fine fuel holes 61. The fuel hole 61 is smaller than a foreign substance contained in the fuel flowing through the fuel passage. Therefore, the foreign matter contained in the fuel is collected by the vibration absorbing member 60. That is, the vibration absorbing member 60 has not only a vibration absorbing function but also a filter function.
In the second embodiment, foreign substances contained in the fuel are collected by the vibration absorbing member 60. Thereby, the filter 16 installed in the fuel inlet 15 can be abolished. Therefore, the number of parts can be reduced and the structure can be simplified.

(Third embodiment)
An injector according to a third embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to a component part substantially the same as 1st Embodiment, and description is abbreviate | omitted.
As shown in FIG. 5, the filter 70 installed at the fuel inlet 15 of the accommodation pipe 11 has a collar 71, a mesh 72, and a stem 73. The collar 71 is press-fitted on the inner peripheral side of the accommodation pipe 11. Therefore, the collar 71 is made of metal. On the other hand, the mesh 72 and the stem 73 are made of a material capable of absorbing vibration. That is, the filter 70 includes a mesh 72 and a stem 73 that are vibration absorbing members. The mesh 72 and the stem 73 are made of, for example, rubber or synthetic resin. In the third embodiment, in contrast to the second embodiment, a vibration absorbing function is added to the filter 70 provided in the injector 10. In the third embodiment, it is not necessary to add a separate vibration absorbing member. Therefore, the number of parts can be reduced.

(Fourth embodiment)
A fuel injection device according to a fourth embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
As shown in FIG. 6, the fuel injection device includes an injector 10 and a delivery pipe 80 connected to the injector 10. In the delivery pipe 80, the fuel distributed from the fuel pump to the injector 10 flows. The delivery pipe 80 supplies fuel to the fuel inlet 15 of the injector 10. The delivery pipe 80 forms a main passage 81 and a sub passage 82 branched from the main passage 81. The sub passage 82 communicates with the fuel passage 41 formed by the accommodation pipe 11 of the injector 10. In the fourth embodiment, the fuel passage includes the main passage 81 and the sub passage 82 of the delivery pipe 80.

  The vibration absorbing member 50 is installed in the sub passage 82 of the delivery pipe 80. As in the second embodiment, the vibration absorbing member 50 has a fuel hole smaller than a foreign substance contained in the fuel flowing through the fuel passage. That is, the vibration absorbing member 50 has a function as a filter. As a result, no filter is installed at the fuel inlet 15 of the injector 10.

  The vibration absorbing member 50 can be installed not only inside the housing pipe 11 as long as it is upstream of the stopper. The generated operating noise and vibration propagate the fuel in the fuel passage to vibrate not only the accommodation pipe 11 but also the delivery pipe 80. Therefore, by absorbing the operating noise and vibration that propagates the fuel in any part of the fuel passage, the operating noise and vibration released to the outside are reduced. Therefore, even if the vibration absorbing member 50 is installed in the delivery pipe 80, it is possible to reduce operating noise and vibration that leak to the outside.

(Fifth embodiment)
An injector according to a fifth embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
The fifth embodiment is different from the first embodiment in structure. The injector 110 according to the fifth embodiment includes a cylindrical fixed core 134. The fixed core 134 forms a fuel inlet 15 at one end in the axial direction. The other end of the fixed core 134 is in contact with the movable core 135 integrated with the needle 125. A part of the needle 125 is chamfered at the end on the movable core 135 side. As a result, a fuel passage 46 is formed between the movable core 135 and the needle 125. The needle 125 has a column part 1251 and a head part 1252. The head portion 1252 is installed at the end of the column portion 1251 opposite to the movable core 135. The seal portion 126 is formed on the outer peripheral surface of the head portion 1252.

  The nozzle 20 is installed on the inner peripheral side of the holder 133. The end of the holder 133 opposite to the nozzle 20 is connected to the fixed core 134 via the nonmagnetic pipe 111. The movable core 135 reciprocates in the axial direction on the inner peripheral side of the nonmagnetic pipe 111 and the holder 133. The holder 133 is magnetically connected to the fixed core 134 via a housing 132 that covers the outer peripheral side of the coil 31. The valve body 21 and the needle 125 form a fuel passage 27.

  A stopper 90 is sandwiched between the nozzle 20 and the holder 133. The stopper 90 is in contact with a step formed at a connection portion between the column part 1251 and the head part 1252 of the needle 125. The stopper 90 forms a fuel passage 91 that connects the movable core 135 side and the valve body 21 side. The movement of the integral needle 125 and the movable core 135 toward the fixed core 134 is restricted when the needle 125 and the stopper 90 are in contact with each other. That is, when the coil 31 is energized, the integral needle 125 and the movable core 135 move to the fixed core 134 side until the needle 125 contacts the stopper 90. When energization of the coil 31 is stopped, the integral needle 125 and the movable core 135 move to the valve body 21 side until the seal portion 126 contacts the valve seat 23. Accordingly, when the energization of the coil 31 is interrupted, the needle 125 repeatedly collides with the stopper 90 or the valve body 21.

  The fuel that has flowed into the filter 16 from the fuel inlet 15 includes a fuel passage 143 formed by the fixed core 134, a fuel passage 145 formed by the adjusting pipe 118, a fuel passage 144 formed by the movable core 135, the movable core 135 and the needle 125. Into the fuel passage 27 via the fuel passage 46 formed by the needle 125 and the holder 133, and the fuel passage 91 formed by the stopper 90.

  The injector 110 includes a vibration absorbing member 150. The vibration absorbing member 150 is formed in a substantially disc shape as in the first embodiment. The vibration absorbing member 150 is installed in the fuel passage 47 between the needle 125 and the holder 133. Accordingly, the vibration absorbing member 150 is installed on the opposite side of the stopper 90 from the nozzle hole 24. The vibration absorbing member 150 is formed in a circular ring shape as shown in FIG. The vibration absorbing member 150 has a hole 151 through which the column part 1251 of the needle 125 penetrates at the center. Further, the vibration absorbing member 150 has a plurality of fuel holes 152 through which fuel passes on the outer peripheral side of the hole portion 151.

  In the fifth embodiment, the vibration absorbing member 150 is applied to the injector 110 that restricts the movement of the integral needle 125 and the movable core 135 toward the fixed core 134 by contacting the needle 125 and the stopper 90. The needle 125 repeatedly collides with the valve body 21 or the stopper 90 due to intermittent energization of the coil 31. The operation sound and vibration generated by the collision between the needle 125 and the valve body 21 or the stopper 90 propagate through the fuel in the fuel passage. By installing the vibration absorbing member 150 in the fuel passage 47 constituting the fuel passage, the propagation of the operating sound and vibration is attenuated. Therefore, it is possible to reduce the release of operating sound and vibration to the outside of the injector 110.

  In the plurality of embodiments described above, the example in which the nozzle holes 24 are installed in the nozzle hole plate 22 of the nozzle 20 has been described. However, the nozzle hole 24 may be formed in the valve body 21 of the nozzle 20. Further, the vibration absorbing members 50 and 150 can be changed to any outer shape according to the shapes of the accommodation pipe 11, the delivery pipe 80 and the holder 133 to be installed. Further, in the plurality of embodiments, the example in which the vibration absorbing member is installed on the inner peripheral side of the accommodation pipe 11 or the delivery pipe 80 has been described. However, the vibration absorbing member may be disposed on the fixed core, the movable core, the inner peripheral side of the adjusting pipe, or the like as long as it is on the upstream side of the fuel flow from the operating noise and vibration source.

It is sectional drawing which shows the injector by 1st Embodiment of this invention. It is sectional drawing to which the nozzle of the injector shown in FIG. 1 was expanded. It is the schematic which shows the planar shape of the vibrational absorption member of the injector by 1st Embodiment of this invention. It is the schematic which shows the planar shape of the vibrational absorption member of the injector by 2nd Embodiment of this invention. It is sectional drawing which shows the injector by 3rd Embodiment of this invention. It is sectional drawing which shows the injector by 4th Embodiment of this invention. It is sectional drawing which shows the injector by 5th Embodiment of this invention. It is the schematic which shows the planar shape of the vibrational absorption member of the injector by 5th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 110 Injector (fuel injection apparatus), 11 Housing pipe, 15 Fuel inlet, 20 Nozzle, 23 Valve seat, 24 Injection hole, 25, 125 Needle, 26, 126 Seal part, 27 Fuel passage, 31 Coil, 34, 134 Fixed core (stopper), 35, 135 Movable core, 41, 42, 43, 44, 45, 46, 47, 143, 144, 145 Fuel passage, 50, 60, 150 Vibration absorbing member, 52, 61, 152 Fuel Hole, 70 filter, 72 mesh (vibration absorbing member), 73 stem (vibration absorbing member), 80 delivery pipe (fuel injection device), 81 main passage (fuel passage), 82 sub passage (fuel passage), 90 stopper, 91 Fuel passage

Claims (5)

A housing having an opening and defining a fuel passage communicating with the opening in the interior;
A needle that is provided inside the housing and interrupts the fuel flow to the opening by being seated or separated from the valve seat of the housing;
A movable core provided inside the housing and reciprocating in the axial direction together with the needle;
A stopper provided inside the housing and restricting movement of the needle or the movable core in a valve opening direction;
A vibration absorbing member installed on the upstream side of the fuel flow from the stopper;
A fuel injection device comprising:   The fuel injection device according to claim 1, wherein the vibration absorbing member is installed inside the housing. A filter provided on the housing for collecting foreign matter contained in the fuel;
The fuel injection device according to claim 2, wherein the vibration absorbing member is provided in the filter. A delivery pipe for supplying fuel to the fuel inlet of the housing;
The fuel injection device according to claim 1, wherein the vibration absorbing member is installed inside the delivery pipe.   The fuel injection device according to claim 1, wherein the vibration absorbing member has a fuel hole through which fuel can pass.

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