JP4125731B2 - Holding member for fuel injection valve - Google Patents

Description

The present invention holds a fuel injection valve in which a fuel injection portion at one end is inserted into an attachment hole provided in an intake passage member, on the intake passage member, and has a fuel inlet portion outer periphery at the other end of the fuel injection valve. A fuel joint portion whose inside communicates with the inside of the cap portion and a pair of mounting boss portions coupled to the intake passage member are integrally connected around a single cap portion that is liquid-tightly fitted into the cap portion. As described above, the present invention relates to an improvement in a fuel injection valve holding member which is integrally formed of synthetic resin.

Such a fuel injection valve holding member is already known as disclosed in Patent Document 1 below.
JP 2000-54937 A

  In the conventional fuel injection valve holding member, since the mounting boss protrudes from the outer peripheral surface corresponding to the fitting surface of the cap portion, the cap portion of the cap portion is affected by the heat shrinkage of the mounting boss portion during molding. There is a possibility that the fitting surface may be distorted. If such a distortion occurs, the reliability of the liquid-tightness of the fitting portion between the fuel inlet portion and the cap portion of the fuel injection valve is impaired.

  The present invention has been made in view of such circumstances, and at the time of molding, the heat shrinkage of the mounting boss portion does not affect the inner peripheral surface of the cap portion, and the fuel inlet portion and the cap portion of the fuel injection valve are provided. It aims at providing the holding member for fuel injection valves which can ensure the liquid-tightness of this fitting part.

In order to achieve the above object, the present invention holds a fuel injection valve having one end of a fuel injection portion inserted into a mounting hole provided in an intake passage member. Around a single cap portion that is liquid-tightly fitted on the outer periphery of the fuel inlet portion at the other end, a fuel joint portion that communicates with the inside of the cap portion, and a pair of mounting bosses that are coupled to the intake passage member as parts and are connected together, it becomes integrally molded by a synthetic resin, the holding member for a fuel injection valve, wherein the pair of mounting bosses and front Symbol cap portion is disposed around the cap portion a part comprising a connection portion for connecting together, the connecting portion, of the inner circumference the cap portion, consolidated integrally with the cap portion at a site distant in the axial direction of the cap portion from the mating surface between the fuel inlet portion be that the first feature .

  The intake passage member corresponds to a throttle body 1 in an embodiment of the present invention described later.

In addition to the first feature, the second feature of the present invention is that the rigidity of the connecting portion between the cap portion and the mounting boss portion is weaker than the rigidity of the cap portion.

According to the first feature of the present invention, the connecting portion that connects the cap portion and the pair of mounting boss portions is located on the inner periphery of the cap portion away from the fitting surface with the fuel inlet portion in the axial direction of the cap portion. Thus, even when heat shrinkage occurs in the mounting boss during molding of the holding member, the effect does not affect the fitting surface. Therefore, since a good fitting surface without distortion can always be secured, a good sealing state is always maintained between this fitting surface and the fuel inlet part fitted to this through a seal ring. Can be surely prevented .

The or a pair of mounting boss portions and one fuel joint portion, because to be arranged distributed around the cap portion, during maintenance, the fuel joint portion in the mounted state of the throttle body of the holding member On the other hand, when attaching and detaching the fuel supply pipe, the load applied to the fuel joint can be distributed to both mounting bosses in a well-balanced manner via the cap part, thereby reducing the size of both mounting bosses and the holding member. Weight reduction is possible.

Further, according to the second feature of the present invention, the rigidity of the connecting part between the cap part and the mounting boss part is made weaker than the rigidity of the cap part. When a power supply coupler is attached to or detached from the coupler, if a large load is applied to the cap part, the thin connecting part bends appropriately, so that the fuel inlet part of the fuel injection valve 10 and the cap part are fitted. Therefore, it is possible to prevent an excessive load from being applied to the portion. Therefore, it is possible to avoid the distortion of the fitting portion and to prevent fuel leakage.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  1 is a plan view showing a state in which a fuel injection valve is attached to a throttle body of an engine using a holding member according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 4 is a bottom view of the holding member, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, FIG. 6 is a view taken in the direction of arrow 6 in FIG. 4, and FIG. It is sectional drawing which shows 2 Examples.

  1 to 3, a throttle body 1 as an intake passage member of an engine has an intake passage 2 connected to an intake port of an engine (not shown). The intake passage 2 is opened and closed to reduce the intake amount of the engine. A valve shaft 3 a of the butterfly throttle valve 3 to be adjusted is rotatably supported on the throttle body 1. On the side wall of the throttle body 1 on the downstream side of the throttle valve 3, a mounting hole 4 that opens to the intake passage 2 and a mounting seat 5 that extends radially from the outer peripheral edge of the mounting hole 4 are formed.

  On the other hand, an electromagnetic fuel injection valve 10 attached to the throttle body 1 has a fuel injection part 11 at one end and a fuel inlet part 12 at the other end. An outer shell 13 made of synthetic resin is formed so as to be embedded in the coil portion, and a power receiving coupler 14 protruding to one side of the outer shell 13 is integrally formed.

  A rubber cushion ring 15 having a sealing function is attached to the outer periphery of the base of the fuel injection unit 11 so as to contact the end surface of the outer skin 13. An O-ring 17 serving as a seal member is attached to the annular seal groove 16 formed on the outer periphery of the fuel inlet portion 12.

  The fuel injection portion 11 of the fuel injection valve 10 is inserted into the mounting hole 4 of the throttle body 1, and the cushion ring 15 is overlapped with the mounting seat 5. The fuel injection valve 10 is held by a synthetic resin holding member 20 so as to compress the cushion ring 15. The holding member 20 holds the single fuel injection valve 10 by the single holding member 20.

  The holding member 20 will be described with reference to FIGS. 1 and 4 to 6.

  The holding member 20 mainly includes a cylindrical cap portion 21. An inner peripheral surface of the cap portion 21 is composed of a cylindrical fitting surface 22 and a tapered guide surface 23 formed on the inlet side of the fitting surface 22, and a fuel inlet of the fuel injection valve 10. The portion 12 is fitted into the fitting surface 22 through the guide surface 23, and the O-ring 17 is in close contact with the fitting surface 22.

  The ceiling 21 a of the cap 21 has a stopper step 24 extending radially inward from the inner end of the fitting surface 22, and an opening on the fitting surface 22 side located at the center of the stopper step 24. The end portion of the fuel inlet portion 12 is brought into contact with the stopper step portion 24 so that the insertion depth of the fuel inlet portion 12 into the cap portion 21 is regulated.

  Further, a pair of cylindrical mounting boss portions 26, 26 projecting outward from the ceiling portion 21a and a single tubular fuel joint portion 27 are integrally formed. Both mounting bosses 26, 26 are arranged so that their axes A, A are parallel to the axis B of the cap part 21, and the ceiling part 21 a of the cap part 21 via a relatively thin plate-like connecting part 28. Connected to Further, a part of the tubular fuel joint portion 27 is a bulging portion 27a on the upper surface of the ceiling portion 21a and protrudes to one side of the ceiling portion 21a. The inside of the fuel joint portion 27 is the ceiling portion 21a. It communicates with the concave portion 25 on the inner surface. Ribs 29 and 29 are formed between the bulging portion 27a and each mounting boss portion 26 to connect them.

In this way, the connecting portions 28, 28 that connect the pair of mounting boss portions 26, 26 and the cap portion 21 are the ceiling of the cap portion 21, which is a portion away from the fitting surface 22 in the axial direction of the cap portion 21. It is connected to the part 21a. The mounting boss portions 26 and 26 are arranged such that both the axes A and A are on the other two vertices of the virtual triangle 30 having the axis B of the cap portion 21 as one vertex in a plan view of the holding member 20. Placed in. At that time, the distance between the axis A of each mounting boss portion 26 and the axis B of the cap portion 21 is set substantially equal. The apex angle α of the triangle 30 on the axis B side of the cap portion 21 is set to an obtuse angle. And the fuel joint part 27 is arrange | positioned in the range of the vertical angle (beta) with respect to the said vertical angle (alpha). As shown in FIG. 1, when the holding member 20 is attached to the fuel injection valve 10, the rotational direction position of the fuel injection valve 10 is regulated so that the power receiving coupler 14 falls within the range of the vertical angle β.

  As described above, the holding member 20 including the cap portion 21, the mounting boss portions 26 and 26, and the fuel joint portion 27 is integrally formed of synthetic resin, and a metal bush 31 is press-fitted into the inner peripheral surface of each mounting boss portion 26. Or it is mold-bonded. The mounting boss portions 26 and 26 are fixed to the throttle body 1 by bolts 35 and 35, respectively. A positioning projection 32 is integrally formed on the outer peripheral surface of the cap portion 21, and the position of the power receiving coupler 14 of the fuel injection valve 10 is regulated with reference to the positioning projection 32. Thus, the fuel joint portion 27 and the power receiving coupler 14 are arranged such that an angle θ formed by the center lines C and D thereof is 50 ° or more.

  Thus, a fuel supply pipe 33 connected to a discharge port of a fuel pump (not shown) is connected to the fuel joint portion 27, and a power feeding coupler 34 is connected to the power receiving coupler 14.

  Next, the operation of the first embodiment will be described.

  In attaching the fuel injection valve 10 to the throttle body 1, the fuel inlet portion 12 of the fuel injection valve 10 is pushed into the cap portion 21 of the holding member 20 until the end surface thereof abuts against the stopper step portion 24. Is brought into close contact with the fitting surface 22. Then, with the relative position between the power receiving coupler 14 of the fuel injection valve 10 and the mounting boss portions 26 and 26 of the holding member 20 set as described above, the fuel injection portion 11 of the fuel injection valve 10 is connected to the throttle body 1. The cushion ring 15 is placed on the mounting seat 5. Next, the mounting boss portions 26 and 26 are fixed to predetermined portions of the throttle body 1 with bolts 35 and 35.

  Thus, the tightening force of the mounting boss portions 26, 26 to the throttle body 1 by the bolts 35, 35 acts as a compressive force from the stopper step portion 24 of the cap portion 21 to the cushion ring 15 via the fuel injection valve 10. The fuel injection valve 10 is elastically supported by the repulsive force.

  During operation of the engine, high-pressure fuel discharged from a fuel pump (not shown) is supplied from the fuel supply pipe 33 to the fuel injection valve 10 through the fuel joint portion 27 of the holding member 20, and the fuel injection portion is opened when the valve 10 is opened. 11 is injected toward the intake port of the engine.

  Incidentally, in the holding member 20 made of synthetic resin, the connecting portions 28 and 28 for connecting the pair of mounting boss portions 26 and 26 and the cap portion 21 are fitted, and the fuel inlet portion 12 of the fuel injection valve 10 of the cap portion 21 is fitted. Since it is connected to a portion separated from the mating fitting surface 22 in the axial direction, even if heat shrinkage occurs in the mounting boss portions 26 and 26 when the holding member 20 is molded, the effect is affected by the fitting surface. Therefore, a good fitting surface 22 that is always free from distortion can be secured, and therefore, between this fitting surface 22 and the fuel inlet portion 12 fitted to this via the O-ring 17. Is always kept in a good sealing state, and high-pressure fuel leakage can be reliably prevented.

  In particular, since both the mounting boss portions 26 and 26 are connected to the ceiling portion 21a of the cap portion 21 via the plate-like connecting portion 28, the heat shrinkage of the both mounting boss portions 26 and 26 at the plate-like connecting portion 28 is achieved. Can be effectively blocked from affecting the fitting surface 22. Moreover, since both the mounting boss portions 26 and 26 are connected to a part of the fuel joint portion 27 which is the bulging portion 27a on the upper surface of the ceiling portion 21a of the cap portion 21 via the ribs 29 and 29, both mounting boss portions are provided. 26, 26 and the ceiling portion 21a can be increased in strength, and the fuel injection valve 10 can be firmly held.

  Further, both mounting boss portions 26 and 26 are arranged so that their two axes A and A are on the other two vertices of the triangle 30 having the axis B of the cap portion 21 as one vertex in a plan view of the holding member 20. Since the fuel joint portion 27 is disposed within the range of the vertical angle β of the triangle 30 with respect to the vertical angle α on the axis B side of the cap portion 21, the pair of mounting boss portions 26, 26 and one fuel joint portion are arranged. 27 is distributed around the cap portion 21, and during maintenance, when the fuel supply pipe 33 is attached to and detached from the fuel joint portion 27 with the holding member 20 attached to the throttle body 1. The attachment / detachment can be easily performed without interference with other objects, and the load applied to the fuel joint portion 27 is balanced between the mounting boss portions 26 and 26 via the cap portion 21. Can be well dispersed and supported. Further, since the power receiving coupler 14 of the fuel injection valve 10 is also arranged in the range of the vertical angle β, during maintenance, the fuel injection valve 10 is held on the throttle body 1 by the holding member 20 with respect to the power receiving coupler 14. When the power feeding coupler 34 is attached / detached, the load applied to the fuel injection valve 10 can be dispersed and supported in a balanced manner on both the mounting bosses 26, 26 via the cap part 21. As a result, it is possible to reduce the size and weight of the mounting boss portions 26 and 26 and the holding member 20. Such an effect becomes more prominent by setting the apex angle α to an obtuse angle.

  Further, since the distance between the axis A of each mounting boss portion 26 and the axis B of the cap portion 21 is set substantially equal, each mounting boss portion 26 can stably support the cap portion 21 under substantially the same conditions. This also contributes to reducing the size and weight of the holding member 20.

  Further, the fuel joint portion 27 of the holding member 20 and the power receiving coupler 14 of the fuel injection valve 10 are arranged so that the angle θ formed by their center lines C and D is 50 ° or more. The attachment / detachment of the fuel supply pipe 33 to / from the fuel joint portion 27 and the attachment / detachment of the feeding coupler 34 to / from the power receiving coupler 14 can be easily performed without interfering with each other, which can contribute to an improvement in assemblability.

  Next, a second embodiment of the present invention shown in FIG. 7 will be described.

  In the second embodiment, in the holding member 20 made of synthetic resin, a pair of mounting bosses 26 and 26 are connected to the periphery of the opening of the guide surface 23 of the cap portion 21 via a connecting portion 28 ′ thinner than the cap portion 21. At the same time, the mounting boss portions 26 and 26 are arranged on the side of the cap portion 21 with a small gap. Since other configurations are the same as those of the previous embodiment, the same reference numerals are given to the portions corresponding to those of the previous embodiment in the figure, and redundant description is omitted.

  Also in the second embodiment, when the holding member 20 is molded with the synthetic resin, the heat shrinkage of the mounting boss portions 26 and 26 may occur in the cap portion 21 even if the mounting boss portions 26 and 26 may shrink. It is possible to block the influence on the fitting surface 22 by the thin connecting portion 28 ′, and it is possible to always ensure a good fitting surface 22 without distortion as in the previous embodiment.

  Further, the thin connecting portion 28 ′ that connects the cap portion 21 and the mounting boss portions 26, 26 is less rigid than the cap portion 21, so that the fuel supply pipe 33 can be attached to and detached from the fuel joint portion 27 and can receive power during maintenance. When a power supply coupler 34 is attached to or detached from the coupler 14, if a large load is applied to the cap portion 21, the connecting portion 28 ′ is appropriately bent, so that the fuel inlet portion 12 and the cap portion 21 of the fuel injection valve 10 are bent. Therefore, it is possible to prevent an excessive load from being applied to the fitting portion. Therefore, distortion of the fitting portion can be avoided and fuel leakage can be prevented.

  As mentioned above, although the Example of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary.

The top view which shows the state which attached the fuel injection valve to the throttle body of the engine using the holding member which concerns on 1st Example of this invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1. The bottom view of the said holding member. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a view taken in the direction of arrow 6 in FIG. 4. Sectional drawing which shows 2nd Example of this invention.

Explanation of symbols

1. Air intake passage member (throttle body)
4... Mounting hole 10... Fuel injection valve 11... Fuel injection part 12... Fuel inlet part 14. ··· Cap portion 22 ··· Fitting surface 26 ··· Mounting boss portion 27 ··· Fuel joint portions 28 and 28 '··· Connecting portion 33 ··· Fuel supply pipe 34 ··· Power supply coupler

Claims (2)

A fuel injection valve (10) having a fuel injection part (11) at one end inserted into a mounting hole (4) provided in the intake path member (1) is held by the intake path member (1), around a single cap portion to be fitted in a liquid tight manner to the fuel inlet section (12) the outer periphery of the other end portion of the injection valve (10) (21), one whose interior communicates with the interior of the cap portion (21) The fuel joint part (27) and a pair of mounting boss parts (26) coupled to the intake passage member (1) are integrally formed of synthetic resin so as to be integrally connected. In the fuel injection valve holding member,
Includes pre Symbol cap portion (21), a connecting portion for connecting together the pair of mounting boss portions arranged around the (26) of the cap portion (21) (28, 28 '), the connecting portion (28, 28 ') at the portion of the inner periphery of the cap portion (21) that is separated from the fitting surface (22) with the fuel inlet portion (12 ) in the axial direction of the cap portion (21). characterized by being consolidated together to 21), a fuel injection valve holding member. The fuel injection valve holding member according to claim 1,
A fuel injection valve holding member characterized in that the rigidity of the connecting portion (28 ') between the cap portion (21) and the mounting boss portion (26) is weaker than the rigidity of the cap portion (21).

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