JP2006220068A - Connection structure of fuel injection valve to connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size of a connection structure of a fuel injection valve to a connector for supplying power to the fuel injection valve. <P>SOLUTION: The resin housing 50 of the fuel injection valve 10 is formed with an insulating material, and a recessed part 52 of C-shape in cross section is peripherally formed in a side wall 51. A projection 53 projected to the outside is formed on the recessed part 52 at a position where the recessed part 52 is interrupted. Steps 54 due to a difference in the diameter of the resin housing 50 are formed at the axial both ends of the recessed part 52. The terminal 56 of the fuel injection valve 10 is exposed to a position further recessed from the bottom face of the recessed part 52 to the inner peripheral side. The connector 60 comprises a connector body 62 formed in C-shape with the elastically deformable resin insulating material and a terminal 64 of a flat spring insert-molded in the connector body 62. Since the connector 60 is fitted to the recessed part 52, a terminal 56 and the terminal 64 are electrically connected to each other while being pressed by the elastic force of the flat spring. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a connection structure between a fuel injection valve and a connector that supplies electric power to the fuel injection valve.

  In recent years, for example, the demand for miniaturization of fuel injection valves has increased due to the increase in the number of mounted parts accompanying the miniaturization of the vehicle engine and the multifunctionalization of the vehicle engine. In response to the demand for miniaturization, miniaturization of the fuel injection valve body is progressing.

However, the conventional fuel injector has a structure in which a connector formed on the fuel injector itself protrudes outward from the side wall of the fuel injector. As a result, although the miniaturization of the fuel injection valve body is progressing, the miniaturization of the connection structure between the fuel injection valve and the connector that supplies electric power to the fuel injection valve is hindered.
The present invention has been made to solve the above problems, and an object of the present invention is to reduce the size of a connection structure between a fuel injection valve and a connector that supplies power to the fuel injection valve.

  According to the first to eleventh aspects of the present invention, since the connector for supplying electric power to the fuel injection valve is structured to cover the side wall of the fuel injection valve, the connection between the fuel injection valve and the connector for supplying electric power to the fuel injection valve It is possible to reduce the amount of protrusion that protrudes outward from the side wall of the fuel injection valve. Therefore, the connection structure between the fuel injection valve and the connector can be reduced in size.

According to the third aspect of the invention, the connector covers the side wall of the fuel injection valve in the circumferential direction, and one position in the circumferential direction of the connector is open. Therefore, the connector can be easily attached to the fuel injection valve from the opening of the connector interrupted in the circumferential direction.
According to the fourth aspect of the present invention, the concave portion is formed on the side wall of the fuel injection valve, and the connector is fitted into the concave portion, so that the amount of projection of the connector protruding from the side wall of the fuel injection valve is reduced.

According to the fifth to seventh aspects of the present invention, since the positioning of the connector is provided on the fuel injection valve, the positioning when the connector is attached to the fuel injection valve is easy. Furthermore, the connector can be prevented from being displaced after the connector is attached to the fuel injection valve.
According to the eighth aspect of the present invention, since at least one terminal of the connector terminal and the fuel injection valve terminal is a leaf spring, the terminals are pressed and connected by elastic force. Therefore, poor electrical connection between terminals can be prevented.

According to the ninth aspect of the present invention, since the seal member is installed between the fuel injection valve and the connector, it is possible to prevent foreign matters such as water and dust from entering the connection portion between the connectors.
According to the tenth aspect of the invention, since the connector main body also serves as the seal member, the number of parts is reduced. In addition, since the work of attaching the connector to the fuel injection valve also serves as the sealing work of the connection portion between the connectors, the number of steps for electrically connecting the fuel injection valve and the connector that supplies power to the fuel injection valve is reduced.

  According to the eleventh aspect of the present invention, the terminal of the fuel injection valve and the terminal of the connector are each covered and sealed with the insulating material, and the terminals are electrically connected via the insulating material. Thereby, since the sealing member which seals the electrical connection location of terminals is unnecessary, a number of parts reduces. Furthermore, since it is not necessary to install a seal member between the fuel injection valve and the connector, the number of steps for electrically connecting the fuel injection valve and the connector is reduced.

Hereinafter, a plurality of embodiments of the present invention will be described based on the drawings.
(First embodiment)
A fuel injection valve according to a first embodiment of the present invention is shown in FIG. The fuel injection valve 10 is a fuel injection valve for a gasoline engine. The cylindrical member 12 is formed in a cylindrical shape composed of a magnetic member and a nonmagnetic member. A fuel passage is formed on the inner peripheral side of the cylindrical member 12, and the valve body 18, the valve member 22, the movable core 24, the spring 26, the fixed core 30, the fuel filter 34, and the like are accommodated in the fuel passage. Yes. The fuel that has flowed into the fuel injection valve 10 from above in FIG. 1 of the cylindrical member 12 is a fuel passage in the fixed core 30, a fuel passage in the movable core 24, a fuel passage in the valve member 22, a fuel hole 22a, a valve. When the member 22 is separated from the valve seat 19, it passes through an opening formed between the valve member 22 and the valve seat 19 and is injected from the injection hole formed in the injection hole plate 19.

  The cylindrical member 12 has a first magnetic member 14, a nonmagnetic member 15 as a magnetoresistive member, and a second magnetic member 16 in this order from the valve body 18 side. The first magnetic member 14 and the nonmagnetic member 15, and the nonmagnetic member 15 and the second magnetic member 16 are coupled by laser welding. The cylindrical member 12 is installed on the inner peripheral side of the coil 44 and covers the outer periphery of the movable core 24 and the fixed core 30. The first magnetic member 14 and the second magnetic member 16 of the cylindrical member 12 form a magnetic circuit with the movable core 24 and the fixed core 30. The nonmagnetic member 15 prevents the magnetic flux from being short-circuited between the first magnetic member 14 and the second magnetic member 16. The fuel filter 34 is accommodated on the fuel inlet side of the cylindrical member 12.

  The valve body 18 is fixed to the inside of the nozzle hole side tip of the first magnetic member 14 by welding. The valve body 18 has a valve seat 19 on the inner peripheral wall on which the valve member 22 can be seated. The cup-shaped nozzle hole plate 19 is fixed to the outer peripheral wall of the valve body 18 by welding. The nozzle hole plate 19 is formed in a thin plate shape, and a plurality of nozzle holes are formed at the center.

  The valve member 22 is a bottomed cylindrical hollow and can be seated on a valve seat 19 formed in the valve body 18. When the valve member 22 is seated on the valve seat 19, the injection hole of the injection hole plate 19 is closed and fuel injection is blocked. A plurality of fuel holes 22 a penetrating the side wall of the valve member 22 are formed on the upstream side of the portion where the valve member 22 is seated on the valve seat 19. The fuel that has flowed into the valve member 22 passes from the inside to the outside through the fuel hole 22a and travels toward the valve portion formed by the valve member 22 and the valve seat 19.

The movable core 24 is fixed to the side of the valve member 22 opposite to the valve body 18 by welding or the like. The spring 26 urges the movable core 24 and the valve member 22 in the direction in which the valve member 22 is seated on the valve seat 19.
The fixed core 30 is formed in a cylindrical shape and is accommodated in the cylindrical member 12. The fixed core 30 is installed on the opposite side of the movable body 24 from the valve body 18 and faces the movable core 24.

The adjusting pipe 32 is press-fitted into the fixed core 30 and engages one end of the spring 26. The urging force of the spring 26 is adjusted by adjusting the press-fitting amount of the adjusting pipe 32.
The magnetic members 40 and 42 are magnetically connected to each other and installed on the outer peripheral side of the coil 44. The magnetic member 40 is magnetically connected to the first magnetic member 14, and the magnetic member 42 is magnetically connected to the second magnetic member 16. The fixed core 30, the movable core 24, the first magnetic member 14, the magnetic members 40 and 42, and the second magnetic member 16 constitute a magnetic circuit. A spool 46 around which the coil 44 is wound is attached to the outer periphery of the cylindrical member 12.

  When the power supply to the coil 44 is turned off, the urging force of the spring 26 moves the valve member 22 downward in FIG. 1, that is, in the valve closing direction, the valve member 22 is seated on the valve seat 19, and the injection hole is closed. Fuel injection is shut off. When energization of the coil 44 is turned on, the movable core 24 is attracted to the fixed core 30 side by a magnetic force against the urging force of the spring 26. Then, the valve member 22 moves to the fixed core 30 side together with the movable core 24 and moves away from the valve seat 19. Thereby, fuel is injected from a nozzle hole.

  A resin housing 50 formed of an insulating material covers the outer periphery of the cylindrical member 12 and the coil 44. A terminal 56 insert-molded in the resin housing 50 is electrically connected to the coil 44 and supplies a drive current to the coil 44. As shown in FIG. 2, a concave portion 52 having a C-shaped cross section is formed in the side wall 51 of the resin housing 50 in the circumferential direction. A protrusion 53 protruding outward with respect to the recess 52 is formed at a location where the recess 52 is interrupted. Further, steps 54 are formed at both ends in the axial direction of the recess 52 due to the difference in diameter of the resin housing 50. The terminal 56 of the fuel injection valve 10 is exposed at a position recessed further from the bottom surface of the recess 52 toward the inner peripheral side.

  The connector 60 has a connector main body 62 formed of an elastically deformable resin insulating material, and a terminal 64 insert-molded on the connector main body 62. The terminal 64 of the connector 60 is formed by a leaf spring. By fitting the connector 60 into the recess 52, the terminal 56 and the terminal 64 are electrically connected while being pressed by the elastic force of the leaf spring.

The connector main body 62 is formed in a C-shape that is opened at one location in the circumferential direction, and covers the recess 52 into which the connector 60 is fitted in the circumferential direction in a range longer than a half circumference. And the space | interval of the opening 63 of the connector main body 62 is shorter than the outer diameter of the recessed part 52 with which the connector 60 fits. The terminal 64 of the connector 60 is electrically connected to the lead wire 66. In a state in which the connector 60 is fitted in the recess 52 that is a part of the side wall 51 of the resin housing 50 and the side wall 51 of the resin housing 50 is covered with the connector 60, the connector 60 has the protrusion 53 as the position in the rotational direction. The positions on both sides are positioned by the step 54. The protrusion 53 of the resin housing 50 is located in the opening 63 of the connector main body 62. Therefore, it is easy to position the connector 60 when the connector 60 is attached to the fuel injection valve 10. Furthermore, it is possible to prevent the position of the connector 60 from shifting in the circumferential direction and the axial direction in a state where the connector 60 is attached to the fuel injection valve 10. Further, since the interval between the openings 63 of the connector main body 62 is shorter than the outer diameter of the recess 52 into which the connector 60 is fitted, the connector 60 comes out of the recess 52 in the radial direction in a state where the connector 60 is fitted into the recess 52. Can be prevented.
When fitting the connector 60 into the recess 52, both ends of the connector body 62 that forms the opening 63 are expanded to elastically deform the connector body 62, and the connector 60 is fitted into the recess 52 of the resin housing 50 from the opening 63 side.

(Second Embodiment)
A second embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment.
The concave portion 58 formed in the resin housing 50 is formed in an annular square shape having no protrusion. The connector 70 is formed in a quadrangular shape in which one place in the circumferential direction of the connector main body 72 is opened. The connector 70 is fitted into the recess 58 so as to cover four circumferential surfaces of the rectangular recess 58. Therefore, when the connector 70 is fitted into the recess 58, the circumferential direction of the connector 70 is positioned, and the rotation of the connector 70 is restricted. Similarly to the first embodiment, the connector 70 is positioned on both sides in the axial direction by a step 54 formed by a diameter difference in the axial direction of the resin housing 50.

  Further, the connector main body 72 covers the concave portion 58 into which the connector 70 is fitted in a range longer than a half circumference, and the interval between the openings 73 formed in the connector main body 72 is smaller than the outer diameter of the rectangular concave portion 58. Therefore, when both ends of the connector main body 72 that forms the opening 73 are spread and the connector 70 is elastically deformed to fit the connector 70 into the recess 58, the connector 70 can be prevented from coming off from the fuel injection valve 10 in the radial direction.

(Third, fourth, fifth and sixth embodiments)
FIG. 4 shows a third embodiment of the present invention, FIG. 5 shows a fourth embodiment, FIG. 6 shows a fifth embodiment, and FIG. 7 shows a sixth embodiment. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment.
In both the third, fourth, and fifth embodiments, the seal member attached to the recess 52 of the resin housing 50 seals between the resin housing 50 and the connector 60 (not shown). In the arrow views other than the cross-sectional views of the drawings showing the third, fourth, and fifth embodiments, the position of the seal member is indicated by hatching.

  The seal member 80 according to the third embodiment shown in FIG. 4 covers the outer periphery of the two terminals 56 exposed in the recess 52 of the resin housing 50. The seal member 80 is made of rubber, and the circumferential length of the seal member 80 is shorter than a half circumference. When the connector 60 shown in the first embodiment is fitted into the recess 52 covering the periphery of the terminal 56 with the seal member 80, the seal member is between the outer peripheral surface of the resin housing 50 and the inner peripheral surface of the connector 60. Sealed by 80. As a result, it is possible to prevent foreign matters such as water and dust from entering the connection portion between the terminal 56 of the fuel injection valve 10 and the terminal 64 of the connector 60.

In the fourth embodiment shown in FIG. 5, the circumferential length of the seal member 90 that covers the outer periphery of the two terminals 56 exposed in the recess 52 is longer than the half circumference, and the circumference of the recess 52 excluding the protrusion 53. It is almost the same as the direction length.
In the fifth embodiment shown in FIG. 6, the seal member 100 covers the outer peripheries of the two terminals 56 exposed in the recess 52. The length of the sealing member 100 in the circumferential direction is longer than a half circumference and is substantially the same as the circumferential length of the recess 52 except for the protrusion 53.

  In the sixth embodiment shown in FIG. 7, the seal member 110 is attached to the inner peripheral surface of the connector 60. The seal member 110 covers the outer peripheries of the two terminals 64 exposed on the inner peripheral surface of the connector 60. When the connector 60 covering the periphery of the terminal 64 with the seal member 110 is fitted into the recess 52 of the first embodiment, the seal member 110 provides a gap between the outer peripheral surface of the resin housing 50 and the inner peripheral surface of the connector 60. Sealed. As a result, it is possible to prevent foreign matters such as water and dust from entering the connection portion between the terminal 56 of the fuel injection valve 10 and the terminal 64 of the connector 60.

(Seventh and eighth embodiments)
A seventh embodiment of the present invention is shown in FIG. 8, and an eighth embodiment is shown in FIG. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment.
In the seventh embodiment shown in FIG. 8, the connector main body 122 of the connector 120 is made of rubber having elasticity, and also serves as a seal member that seals between the fuel injection valve 10 and the connector 120. The connector main body 122 is formed in a C-shape that is opened at one place in the circumferential direction, and covers the recess 52 into which the connector 120 is fitted in the circumferential direction in a range longer than a half circumference. And the space | interval of the opening 123 of the connector main body 122 is shorter than the outer diameter of the recessed part 52 with which the connector 60 fits.

In the eighth embodiment shown in FIG. 9, the connector main body 132 of the connector 130 is made of rubber having elasticity, and also serves as a seal member that seals between the fuel injection valve 10 and the connector 120. The connector main body 132 is formed in a circular shape and is inserted into the fuel injection valve 10 from the axial end portion side.
In the seventh and eighth embodiments described above, since the connector main bodies 122 and 132 also serve as a seal member, it is not necessary to prepare a new seal member. Therefore, the number of parts is reduced. Further, since the work of attaching the connectors 120 and 130 to the resin housing 50 also serves as the sealing work of the fuel injection valve 10 and the connectors 120 and 130, the number of steps for electrically connecting the fuel injection valve 10 and the connectors 120 and 130 is reduced. To do.

(Ninth embodiment)
A ninth embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment.
The recess 140 formed in the resin housing 50 of the fuel injection valve 10 is substantially C-shaped. A flat surface 142 is formed on the opposite side to the protrusion 53 of the recess 140 in the radial direction. The terminal 143 of the fuel injection valve 10 is covered with the resin housing 50 inside the plane 142.

  The connector 150 is also formed in a substantially C shape. The connector main body 152 is formed in a C-shape that is opened at one place in the circumferential direction, and covers the recess 140 into which the connector 150 is fitted in the circumferential direction in a range longer than a half circumference. And the space | interval of the opening 153 of the connector main body 152 is shorter than the outer diameter of the recessed part 140 with which the connector 150 fits. A flat surface 154 is formed on the inner peripheral surface of the connector main body 152 on the side opposite to the opening 153 in the radial direction. The terminal 156 of the connector 150 is covered with the connector main body 152 inside the plane 142.

  The thickness of the resin covering the terminals 143 and 156 in both the resin housing 50 and the connector main body 152 is such that the terminals 143 and 156 are not exposed and are not easily damaged when the connector 150 is fitted in the recess 52. It is as thin as possible. Therefore, although the resin housing 50 and the connector main body 152 are formed of an insulating resin material, the insulating film covering the terminals 143 and 156 with the connector 150 fitted to the fuel injection valve 10 as shown in FIG. The terminal 143 and the terminal 156 are electrically connected via each other.

In the ninth embodiment, the resin housing 50 and the connector main body 152 themselves cover the terminals 143 and 156, but the terminals 143 and 156 may be covered with an insulating material separately from the resin housing 50 and the connector main body 152. Further, only the terminals 143 and 156 may be covered with an insulating material.
In the above-described plurality of embodiments, the connector is fitted in the recess formed in the side wall 51 of the resin housing 50 so that the connector covers the side wall 51 in the circumferential direction, and the terminal of the fuel injection valve 10 and the terminal of the connector Is connected to the electrical journal. Thereby, since the protrusion amount of the connector which protrudes the outer side of the side wall 51 reduces, the connection structure of the fuel injection valve 10 and a connector is reduced in size.

(Other embodiments)
In the plurality of embodiments except for the eighth embodiment, the connector covers the outer periphery of the recess of the resin housing 50 with a length longer than a half circumference, and the distance between the openings formed in one circumferential direction of the connector is determined by the connector. The outer diameter of the recess of the resin housing 50 to be fitted is shorter. On the other hand, if the side wall 51 of the resin housing 50 is covered, the circumferential length of the connector may be less than or equal to a half circumference of the recess into which the connector is fitted.

  In the above embodiments, the connector is fitted in the recess formed in the side wall 51 of the resin housing 50 of the fuel injection valve 10, but the recess is not formed in the side wall 51 of the resin housing 50 and has the same outer diameter as the other part. Alternatively, the side wall 51 of the resin housing 50 may be covered with a connector in the circumferential direction. Further, if the side wall 51 of the resin housing 50 is covered, the connector may be longer in the axial direction than in the circumferential direction.

It is sectional drawing which shows the fuel injection valve and connector by 1st Embodiment of this invention. (A) is the II-II sectional view taken on the line of FIG. 1, (B) is sectional drawing of a connector, (C) is sectional drawing of a fuel injection valve. It is sectional drawing which shows the connection structure of the fuel injection valve and connector in the same cross-sectional position as FIG. 2 by 2nd Embodiment. (A) is sectional drawing of the fuel injection valve of 3rd Embodiment in the same cross-sectional position as FIG. 2, (B) is a B direction arrow directional view of (A), (C) is C of (A). FIG. (A) is sectional drawing of the fuel injection valve of 4th Embodiment in the same cross-sectional position as FIG. 2, (B) is a B direction arrow directional view of (A), (C) is C of (A). FIG. (A) is sectional drawing of the fuel injection valve of 5th Embodiment in the same cross-sectional position as FIG. 2, (B) is a B direction arrow directional view of (A), (C) is C of (A). FIG. It is sectional drawing which shows the connector by 6th Embodiment. It is sectional drawing which shows the connector by 7th Embodiment. It is sectional drawing which shows the connector by 8th Embodiment. It is sectional drawing which shows the fuel injection valve and connector by 9th Embodiment in the same cross-sectional position as FIG.

Explanation of symbols

10 Fuel injection valve, 50 Resin housing, 51 Side wall, 52, 58, 140 Recess, 53 Protrusion, 54 Step, 56, 143 Terminal, 60, 70, 120, 130, 150 Connector, 63, 73, 123, 153 Opening, 64, 156 Terminal, 80, 90, 100, 110 Seal member, 122, 132 Connector body (seal member)

Claims (11)

A connection structure between a fuel injection valve and a connector for supplying electric power to the fuel injection valve,
The connector is a connection structure between a fuel injection valve and a connector, wherein the connector covers a side wall of the fuel injection valve.   The connection structure between the fuel injection valve and the connector according to claim 1, wherein the connector covers the side wall of the fuel injection valve in a circumferential direction.   The connection structure between the fuel injection valve and the connector according to claim 2, wherein one place in the circumferential direction of the connector is opened.   4. A connection structure between a fuel injection valve and a connector according to claim 1, wherein a recess is formed in the side wall of the fuel injection valve, and the connector is fitted into the recess. .   The connection structure between the fuel injection valve and the connector according to any one of claims 1 to 4, wherein the connector is positioned on the fuel injection valve.   6. The connection structure between a fuel injection valve and a connector according to claim 5, wherein the positioning is a protrusion provided on the side wall of the fuel injection valve.   7. The connection structure between a fuel injection valve and a connector according to claim 5, wherein the positioning is a step provided on the side wall of the fuel injection valve.   8. The fuel injection valve / connector connection structure according to claim 1, wherein at least one of the connector terminal and the fuel injection valve terminal is a leaf spring.   The connection structure between the fuel injection valve and the connector according to any one of claims 1 to 8, wherein a seal member seals between the fuel injection valve and the connector.   9. The connection structure between a fuel injection valve and a connector according to claim 1, wherein the main body of the connector also serves as a seal member. The terminal of the fuel injection valve and the terminal of the connector are each covered with an insulating material and sealed, and the terminals are electrically connected to each other through the insulating material. A connection structure between the fuel injection valve according to any one of the above and a connector.

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