Title of Invention

FUEL INJECTION VALVE

Abstract

A fuel injection valve includes a housing, a needle, a movable core, a coil spring, and a filter member. The housing internally defines a fuel passage. The needle is provided inside the housing. The movable core is provided inside the housing. The coil spring contacts the movable core to press the movable core against the needle. The filter member is fixed to the housing. The filter member has a locking member that contacts the coil spring. The filter member removes an object in fuel, which flows into the fuel passage. The filter member includes an outer wall member, which extends from the locking member in the longitudinal direction toward an outer periphery of the coil spring. The outer surface of the outer wall member contacts the housing to locate the filter member relative to the housing in the longitudinal direction.

Full Text

FUEL INJECTION VALVE BACKGROUND OF THE INVENTION 1. Field of the Invention: The present invention relates to a fuel injection valve, which injects fuel to an engine. 2. Description of Related Art: Conventionally, a fuel injection value, which electromagnetically drives a needle, has been known. In the above fuel injection valve, the needle and a movable core are integrated with each other, and are reciprocably displaced in a longitudinal direction in a housing, which internally defines a fuel passage. When a coil is energized, a magnetic attractive force is produced between the movable core and a fixed core. Thus, the integrated movable core and needle are displaced toward the fixed core to open a valve. In contrast, when the coil is deenergized, the integrated movable core and needle are displaced by a coil spring away from the fixed core (i.e., toward a valve seat) to close the valve (see Japanese Unexamined Patent Publication H6-502902 corresponding to US Patent No. 5340032). The fuel injection valve of Japanese Unexamined Patent Publication H6-502902 discloses a filter member, which removes an object in fuel, is fixed to the housing. Then, an end of the coil spring contacts the movable core, and also the other end contacts a casing of the filter member. The filter member includes a position adjusting member that contacts the housing to fix the filter member Thus, a longitudinal fixing position of the position adjusting member relative to the housing can be adjusted to adjust a pressing force by the coil spring. Therefore, the number of components can be reduced compared with a case, where a dedicated member for the above adjustment is provided in addition to the filter member. However, the above conventional fuel injection valve disadvantageously has a longer filter member correspondingly to a longitudinal length of the position adjusting member, although the number of the components can be reduced. Therefore, the fuel injection valve may increase in a longitudinal length (increase in size in the longitudinal direction). Also, the other end of the coil spring merely contacts a bottom surface of the filter member, and is not guided in the longitudinal direction. Therefore, when the coil spring resiliency deforms in the longitudinal direction, the coil spring may be likely to bend in a transverse direction to the longitudinal direction. Then, durability of the coil spring may be degraded, and variations of a response of the needle operation may be generated. SUMMARY OF THE INVENTION The present invention is made in view of the above disadvantages. Thus, it is an objective of the present invention to address at least one of the above disadvantages. To achieve the objective of the present invention, there is provided a fuel injection valve, which includes a housing, a needle, a movable core, a coil spring, and a filter member The housing internally defines a fuel passage. The needle is provided inside the housing. The needle is engaged with and disengaged from a valve seat of the housing such that a flow of fuel through the fuel passage is changed. The movable core is provided inside the housing. The movable core is reciprocably displaceable with the needle in a longitudinal direction. The coil spring contacts the movable core through one end portion of the coil spring to press the movable core against the needle. The filter member is fixed to the housing. The filter member has a locking member that contacts another end portion of the coil spring. The filter member removes an object in the fuel, which flows into the fuel passage. The filter member includes an outer wall member, which extends from the locking member in the longitudinal direction toward an outer periphery of the coil spring. The outer surface of the outer wall member contacts the housing to locate the filter member relative to the housing in the longitudinal direction. BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with additional objectives, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings in which: FIG. 1 is a sectional view showing an injector of a first embodiment of the present invention; FIG. 2 is an enlarged sectional view of a nozzle of the injector shown in FIG. 1; FIG. 3 is a sectional view showing a filter member assembled with a spring of the injector shown in FIG. 1; FIG. 4 is a sectional view showing a filter member of a second embodiment of the present invention; FIG. 5 is a sectional view showing a filter member of a third embodiment of the present invention; FIG. 6 is a sectional view showing a filter member of a fourth embodiment of the present invention; FIG. 7 is a sectional view showing a filter member of a fifth embodiment of the present invention; and FIG. 8 is a sectional view showing a filter member of a sixth embodiment of the present invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS A plurality of embodiments of a present invention will be described based on drawings. (First Embodiment) FIG. 1 and FIG. 2 show an injector serving as a fuel injection valve according to the first embodiment of the present invention. An injector 10 of the first embodiment injects fuel into intake air, which, for example, is taken into a combustion chamber of a gasoline engine. Here, the injector 10 can be applied to a direct-injection gasoline engine, in which the fuel is directly injected into the combustion chamber of the gasoline engine, and also to a diesel engine. A fuel injection apparatus includes the injector 10 and a delivery pipe, which is not shown and supplies the fuel to the injector 10. A receiving pipe 11 of the injector 10 has a thin-walled tubular shape. The receiving pipe 11 has a first magnetic member 12, a nonmagnetic member 13, and a second magnetic member 14. The nonmagnetic member 13 limits a magnetic short circuit between the first magnetic member 12 and the second magnetic member 14. The receiving pipe 11 has a fuel intake port 15 at one end portion. The fuel intake port 15 is supplied with the fuel from a fuel pump, which is not shown. The fuel supplied to the fuel intake port 15 flows into a fuel passage 41 radially inward of the receiving pipe 11 via a filter member 50. The filter member 50 is provided inside the receiving ptpe 11 to remove an object in the fuel. A nozzle 20 is provided at an end portion of the first magnetic member 12, in other words, is provided at an opposite side of the receiving pipe 11 opposite from the fuel intake port 15. The nozzle 20 includes a valve body 21 and an injection hole plate 22. The valve body 21 has a generally cylindrical shape, and is fixed to an inner periphery of the first magnetic member 12. The valve body 21 has an opening portion 21a at an end portion, in other words, an opposite end portion opposite from the fuel intake port 15. The valve body 21 has a valve seat 23 at a conical inner wall, an inner diameter of which becomes smaller as approaching to the opening portion 21a. The valve body 21 has the injection hole plate 22 at an opposite end portion thereof opposite from the receiving pipe 11. The injection hole plate 22 has injection holes 24, which provides communication between its inner wall toward the valve seat 23 and its outer wall opposite from the valve seat 23. The needle 25 is reciprocably received radially inward of the first magnetic member 12 and the valve body 21, reciprocable in a longitudinal direction (i.e., an axial direction, a direction of axis). The needle 25 is located generally coaxially with the receiving pipe 11 and the valve body 21. The needle 25 has a seal member 26 near its end portion, which is located on an injection hole plate 22 side of the needle 25. The seal member 26 is removable from the valve seat 23 of the valve body 21. A fuel passage 27, through which the fuel flows, is defined between the needle 25 and the valve body 21. Disengagement of the seal member 26 of the needle 25 from the valve seat 23 provides communication between the fuel passage 27 and the injection holes 24. In the present embodiment, the needle 25 has a tubular shape. The needle 25 defines a fuel passage 42 at an inner periphery thereof. The needle 25 has a hole 251 and a hole 252, which connect the fuel passage 42 with the fuel passage 27. Here, the needle 25 is not limited to have the tubular shape, but may have a solid column shape. The injector 10 has a drive member 30 for driving the needle 25. The drive member 30 is an electromagnetic drive member. The drive member 30 has a coil 31, a 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 an outer periphery of the coil 31. The holder 33 is located at an outer periphery of the receiving pipe 11, and supports the coil 31 from an injection hole 24 side. The plate 32 and the holder 33 are made of the magnetic material and are magnetically connected. Outer peripheries of the coil 31, the plate 32, the holder 33, and the receiving pipe 11 is covered by a resin mold 36. The coil 31 is electrically connected with a terminal 39 provided to a connector 38 through a wiring member 37. The tubular fixed core 34, the receiving pipe 11, the valve body 21, the drive member 30, which is provided at the outer peripheries of the above components, and the resin mold 36, which covers the above, constitute a housing, which internally defines the fuel passages. The receiving pipe 11 is held between the fixed core 34 and the coil 31, and the fixed core 34 is fixed radially inward of the coil 31. The fixed core 34 is made of a magnetic material, such as iron, and has a generally cylindrical shape. The fixed core 34 internally defines a fuel passage 43. The fixed core 34 is provided to form a predetermined clearance between the fixed core 34 and the movable core 35. The clearance between the fixed core 34 and the movable core 35 corresponds to a lift amount of the needle 25. The movable core 35 is received radially inward of the receiving pipe 11. The movable core 35 is reciprocably displaceable in the longitudinal direction radially inward of the receiving pipe 11. An opposite end portion of the movable core 35 opposite from the injection holes 24 faces the fixed core 34. The movable core 35 is made of the magnetic material, such as iron. The movable core 35 radially inwardly defines a fuel passage 44. An opposite end portion of the needle 25 opposite from the seal member 25 is fixed at the inner periphery of the movable core 35. Therefore, the needle 25 and the movable core 35 are integrated and are reciprocably displaceable in the longitudinal direction. A movement of the integrated needle 25 and movable core 35 toward the injection holes 24 is regulated by seating the seal member 26 with the valve seat 23. Also, when the integrated needle and movable core 35 move away from the injection holes 24, the movable core 35 contacts the fixed core 34. Therefore, a movement of the integrated needle 25 and movable core 35 toward the fixed core 34 is regulated. Therefore, the fixed core 34 functions as a stopper for regulating the movement of the integrated needle 25 and movable core 35 toward the fixed core 34. The movable core 35 contacts a compression coil spring 17 (hereinafter referred as a spring 17). The spring 17 contacts the movable core 35 at one end portion of the spring 17 in the longitudinal direction, and contacts the filter member 50 at the other end portion of the spring 17. The filter member 50 is fixed radially inward of the fixed core 34. The spring 17 has an expansion force in the longitudinal direction. Therefore, the other end of the spring 17, the one end of which is fixed, presses the integrated needle 25 and movable core 35 toward the valve seat 23. A load of the spring 17 is adjustable based on a press-fitting amount of the filter member 50 into the fixed core 34. When the coil 31 is not energized, the integrated needle 25 and movable core 35 are pressed against the valve seat 23. Therefore, the seal member 26 is seated with (engaged with) the valve seat 23. The filter member 50 has a generally cylindrical shape. The fuel, which flows through the fuel intake port 15 to the filter member 50, passes through the filter member 50 via a fuel passage 41, which is defined by the receiving pipe 11. Then, the fuel flows into the fuel passage 27 via the fuel passage 41, the fuel passage 43 defined by the fixed core 34, the fuel passage 44 defined by the movable core 35, the fuel passage 42 of the needle 25, the hole 251, and the hole 252. Next, the structure of the filter member 50 will be detailed with reference to FIG. 3. FIG. 3 is a sectional view showing the filter member 50 assembled with the spring 17. The filter member 50 includes a mesh 51, which captures the object in the fuel, a casing, which keeps the mesh in a predetermined shape, and a collar 53, which keeps the casing 52 to the fixed core 34. The mesh 51 and the collar 53 are made of metal, and the casing 52 is made of a resin. The mesh 51 and the collar 53 are formed integrally with the casing 52 by an insert molding. The casing 52 has a generally cylindrical shape that extends in the longitudinal direction. An opening portion 521, which opens toward an upstream side of the fuel passage 43, is provided at an upstream end portion of the casing 52 in a flow direction of the fuel (one of both end portions of the casing 52). A downstream end portion of both end portions of the casing 52 is blocked, and opening portions 522, which open toward a downstream side of the fuel passage 43, are provided at side faces of the casing 52. Each of the opening portions 522 has an extending shape that extends in the longitudinal direction, and multiple opening portions 522 are provided in a circumferential direction. The mesh 51 has a sack shape, which opens toward the upstream side of the fuel passage 43. The mesh 51 is provided along an inner peripheral surface of the casing 52 to cover the opining portions 522. Therefore, in the fuel passage 43, the fuel, which flows through the opening portion 521 into the casing 52, passes through the mesh 51 and flows out of the opening portions 522. The mesh 51 has an extending shape that extends in the longitudinal direction, and is located radially inward of the spring 17. Therefore, a longitudinal position of the mesh 51 overlaps with a longitudinal position of the spring 17. Thus, this limits the injector 10 from increasing in a longitudinal length. Also, a perpendicular dimension of the opening portion 522 perpendicular to an axis (i.e., an opening width) is designed to become smaller at a location closer to the downstream side. Therefore, the width dimension of the mesh 51 is smaller at the location closer to the downstream side thereof. The collar 53 has a hook shape having a locking member 531, an inner wall member 532, and an outer wall member 533. The locking member 531 contacts an opposite end portion of the spring 17 opposite from the needle 25 such that the spring 17 is limited from moving away from the needle 25 in the longitudinal direction. The inner wall member 532 has a generally cylindrical shape that extends from the locking member 531 in the longitudinal direction. An outer peripheral surface of the inner wall member 532 extends along an inner peripheral surface of the spring 17 in the longitudinal direction. Also, an inner peripheral surface of the inner wall member 532 contacts an outer peripheral surface of the casing 52. The inner wall member 532 includes an engaging member 534 at an end portion thereof toward the needle 25. The engaging member 534 radially inwardly bends to engage with the casing 52 in the longitudinal direction. Therefore, the casing 52 is limited from coming off from the collar 53. The outer wall member 533 has a generally cylindrical shape that longitudinally extends from the locking member 531. An inner peripheral surface of the outer wall member 533 longitudinally extends along an outer peripheral surface of the spring 17, and an outer peripheral surface of the outer wall member 533 contacts an inner peripheral surface of the fixed core 34. Here, in the present embodiment, "the outer peripheral surface of the spring 17" means an opposite surface of a wire rod of the spring 17 opposite from a coil center of the spring 17. Also, "the inner peripheral surface of the spring 17" means another surface of the wire rod of the spring 17 located toward the coil center. The outer wall member 533 includes an engaging member 535 at an end portion thereof toward the needle 25. The engaging member 535 radially inwardly bends to engage with the spring 17 in the longitudinal direction. Therefore, in the assembling process for assembling the spring 17 and the filter member 50 into the fixed core 34, the spring 17 is limited from coming off from the collar 53 in a state, where the spring 17 is assembled with the filter member 50. Because the spring 17 and the filter member 50 can be unitized as above, an operation of assembly into the fixed core 34 can be improved. The collar 53 is press fitted inside the fixed core 34 in the longitudinal direction in a state, where the outer wall member 533 is pressed against the inner peripheral surface of the fixed core 34. A longitudinal fixed position of the collar 53 relative to the housing can be adjusted by adjusting this press-fitting amount. Therefore, a pressing force of the spring 17 for pressing the movable core 35 toward the needle 25 can be adjusted. The outer wall member 533 is tightly fitted with the inner peripheral surface of the fixed core 34 by the press-fitting. As a result, this limits the fuel from leaking through contacting faces between the collar 53 and the fixed core 34 without passing through the mesh 51. The end portion of the outer wall member 533 toward the needle 25, in other words, the engaging member 535, is an open end. Therefore, the outer wall member 533 is easily deformable radially inwardly when the collar 53 is press fitted into the fixed core 34. As a result, a press-fitting force is limited from excessively increasing, and also the fuel is limited from leaking through the contacting faces between the collar 53 and the fixed core 34. Next, an operation of the injector 10 of the above structure will be described. When energization to the coil 31 is stopped, the magnetic attractive force is not generated between the fixed core 34 and the movable core 35. Therefore, the integrated needle 25 and movable core 35 are pressed toward the valve body 21 by the spring 17. According to this, the integrated needle 25 and movable core 35 move toward valve body 21, and the seal member 26 is seated with the valve seat 23. As a result, the communication between the fuel passage 27 and the injection holes 24 is cut off such that the fuel is not injected through the injection holes 24. When the coil 31 is energized, a magnetic circuit is formed at the second magnetic member 14, the fixed core 34, the movable core 35, the first magnetic member 12, the holder 33 and the plate 32 by the generated magnetic field. Thus, the magnetic attractive force is generated between the fixed core 34 and the movable core 35. This magnetic attractive force attracts the movable core 35 toward the fixed core 34. When the magnetic attractive force becomes larger than the pressing force of the spring 17, the integrated needle 25 and movable core 35 move toward the fixed core 34. Then, the integrated needle 25 and movable core 35 move toward the fixed core 34 until the integrated ones contact the fixed core 34. When the integrated needle 25 and movable core 35 move toward the fixed core 34, the seal member 26 is disengaged from the valve seat 23. Thus, the fuel passage 27 communicates with the injection holes 24 through the opening portion 21a, and a valve opening state, where the fuel is injected through the injection holes 24, is set. When the energization to the coil 31 is stopped, the magnetic attractive force between the fixed core 34 and the movable core 35 disappears. Therefore, the integrated needle 25 and movable core 35 are again pressed toward the valve body 21 by the spring 17. Thus, the integrated needle 25 and movable core 35 move toward the valve body 21. The integrated needle 25 and movable core 35 move toward the valve body 21 until the seal member 26 is seated with the valve seat 23. When the seal member 26 is seated with the valve seat 23, the communication between the fuel passage 27 and the injection holes 24 is cut off, and a valve closed state, where the fuel is not injected through the injection holes 24, is set. In the present embodiment, the collar 53 of the filter member 50 is designed to be press fitted into the fixed core 34. Thus, the spring 17 is stopped in the longitudinal direction by the locking member 531 of the filter member 50. Therefore, the pressing force by the spring 17 can be adjusted by adjusting the press-fitting amount of the collar 53. Therefore, a dedicated member for the above adjustment is not required in addition to the filter member 50. Thus, the number of components can be reduced. Also, the filter member 50 includes the outer wall member 533, which longitudinally extends from the locking member 531 along the outer peripheral surface of the spring 17, and the inner wall member 532, which longitudinally extends from the locking member 531 along the inner peripheral surface of the spring 17. Therefore, when the spring 17 resiliency deforms in the longitudinal direction, the end portion of the spring 17 is guided in the longitudinal direction by the outer wall member 533 and the inner wall member 532. Therefore, the spring 17 is less likely to bend in the traverse direction to the longitudinal direction. Thus, the durability of the spring 17 can be improved, and variations in the response of the operation of the needle 25 can be reduced. Also, the spring 17 is provided inside the outer wall member 533, which is press fitted into the fixed core 34. Therefore, the outer wall member 533 and the spring 17 are positioned to overlap with each other in the longitudinal direction. Therefore, the injector 10 can be reduced in size in the longitudinal direction. Here, an injector 10, which is applied to a manifold injection type engine, where the fuel is injected into an intake pipe communicating with the combustion chamber, needs to be designed to be shorter in the longitudinal direction than an injector 10, which is applied to the direct injection engine, where the fuel is directly injected into the combustion chamber. Also, overall lengths of the injectors required for different vehicle types are different. In the injector 10 of the present embodiment, the longitudinal length thereof can be reduced. Thus, the injector 10 of the present embodiment can be applied regardless of the vehicle types or engine type, only if the length of the receiving pipe 11 of the injector 10, which is applied to the manifold injection type engine, is changed. The mesh 51 has the sack shape that extends in the longitudinal direction. Therefore, the fuel injection valve is limited from increasing in size in a perpendicular direction to the longitudinal direction. Also, a large filtering area can be retained. Also, the sack-shaped mesh 51 is positioned inside the coil spring 17. Therefore, because a longitudinal position of the mesh 51 overlaps with the longitudinal position of the coil spring 17, the fuel injection valve is limited from increasing in a longitudinal length. Hereinafter, the second to sixth embodiments of the present invention will be described based on FIG. 4 to FIG. 8. The same numerals are used for corresponding constituent parts, which are substantially the same constituent parts in the first embodiment, and explanations thereof will be omitted. (Second Embodiment) FIG. 4 is a sectional view showing a filter member 50 of the second embodiment. In the second embodiment, the engaging member 535 is not used. In the above first embodiment, the outer wall member 533 includes the engaging member 535 at the end portion thereof, and the engaging member 535 radially inwardly bends to engage with the spring 17 in the longitudinal direction. Therefore, the spring 17 and the filter member 50 can be unitized, and the operation for assembling with the fixed core 34 can be improved. In contrast to this, in the second embodiment, where the engaging member 535 is not used such that the labor hour for machining the collar 53 to form the engaging member 535 can be reduced. (Third Embodiment) FIG. 5 is a sectional view showing a filter member 50 of the third embodiment. In the third embodiment, the casing 52 has an engaging member 523 at a portion, with which the engaging member 534 of the collar 53 engages. The engaging member 523 engages with the engaging member 534. The engaging member 523 has a shape that bends radially outwardly, and at the same time has an annular shape that extends to face with an upstream surface of the engaging member 534. Therefore, the casing 52 is limited from coming off from the collar 53 to the downstream side due to a flow pressure of the fuel. (Fourth Embodiment) FIG. 6 is a sectional view showing a filter member 50 of the fourth embodiment. In the above first embodiment, the casing 52 and the mesh 51 have the sack shapes. In contrast to this, in the fourth embodiment, a casing 52 and a mesh 51 are formed to have a plane shape that extends perpendicularly to the longitudinal direction. Also, the casing 52 and the mesh 51 are provided at a position near the locking member 531 of the collar 53. Also, the casing 52 and the mesh 51 have circular shapes and their dimensions are larger than an inner diameter of the inner wall member 532. Therefore, the casing 52 is limited from coming off the collar 53 to the downstream side due to the flow pressure of the fuel. (Fifth Embodiment) FIG. 7 is a sectional view showing a filter member 50 of the fifth embodiment. In the fifth embodiment, the inner wall member 532 is not used, but the outer wall member 533 exclusively serves as a longitudinal guide of the spring 17. Therefore, a machining cost for the collar 53 can be reduced. (Sixth Embodiment) FIG. 8 is a sectional view showing a filter member 50 of the sixth embodiment. In the above fourth embodiment, the casing 52 and the mesh 51 are provided at a position near the locking member 531 of the collar 53. In contrast to this, in the sixth embodiment, a casing 52 and a mesh 51 are provided at a position near the downstream end portion of the inner wall member 532. Also, the casing 52 and the mesh 51 are provided to face an upstream surface of the engaging member 534. Therefore, the casing 52 is limited from coming off from the collar 53 to the downstream side due to the flow pressure of the fuel. (Other Embodiment) In each of the above embodiments, the collar 53 is made of metal. However, in carrying out the present invention, the collar 53 may be alternatively made of a resin, and may be resin-molded integrally with the casing 52. Through this, the number of components of the filter member 50 can be reduced. In each of the above embodiments, the outer wall member 533 is press fitted into the fixed core 34. However, the present invention is not limited to the press-fitting into the fixed core 34, but, for example, the outer wall member 533 may be alternatively press fitted into the receiving pipe 11. Also, in the present invention, a fixation of the outer wall member 533 with the fixed core 34 is not limited to a fixation through the press-fitting. However, for example, the fixation may be alternatively achieved by a spot welding. In this way, the present invention is not limited to the above embodiments, but can be applied to various embodiments as long as its point is not deviated. Additional advantages and modifications will readily occur to those skilled in the art. The invention in its broader terms is therefore not limited to the specific details, representative apparatus, and illustrative examples shown and described. What is claimed is: 1. A fuel injection valve comprising: a housing that internally defines a fuel passage; a needle that is provided inside the housing, the needle being engaged with and disengaged from a valve seat of the housing such that a flow of fuel through the fuel passage is changed; a movable core that is provided inside the housing, the movable core being reciprocably displaceable with the needle in a longitudinal direction; a coil spring that contacts the movable core through one end portion of the coil spring to press the movable core against the needle; and a filter member that is fixed to the housing, wherein: the filter member has a locking member that contacts another end portion of the coil spring; the filter member removes an object in the fuel, which flows into the fuel passage; the filter member includes an outer wall member, which extends from the locking member in the longitudinal direction toward an outer periphery of the coil spring; and an outer surface of the outer wall member contacts the housing to locate the filter member relative to the housing in the longitudinal direction. 2. The valve according to claim 1, wherein: the filter member has an inner wall member, which extends from the locking member toward an inner periphery of the coil spring. 3. The valve according to claim 2, wherein: the filter member includes a mesh that captures the object; the filter member includes a casing that keeps the mesh in a predetermined shape; and the inner wall member supports one of the followings: an opposite end portion of the casing opposite from the needle; and an outer peripheral surface of the casing. 4. The valve according to claim 3, wherein: the inner wall member is made of metal; the casing is made of a resin; and the inner wall member is provided integrally with the casing by an insert molding. 5. The valve according to claim 1 or 2, wherein: the filter member includes a mesh that captures the object; and the mesh is positioned radially inward of the coil spring, the mesh having a sack shape that extends in the longitudinal direction. 6. The valve according to claim 3 or 4, wherein: the mesh is positioned radially inward of the coil spring, the mesh having a sack shape that extends in the longitudinal direction. 7. The valve according to claim 1, wherein: the outer wall member includes an engaging member at an end portion thereof toward the needle, the engaging member radially inwardly bending to

Documents:

230-che-2007 abstract.pdf

230-che-2007 claims.pdf

230-che-2007 correspondence others.pdf

230-che-2007-abstract.pdf

230-che-2007-claims.pdf

230-che-2007-correspondnece-others.pdf

230-che-2007-description(complete).pdf

230-che-2007-drawings.pdf

230-che-2007-form 1.pdf

230-che-2007-form 18.pdf

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230-che-2007-priority document.pdf