Fuel injection valve

Abstract

To provide a fuel injection valve with a holder capable of suppressing deterioration in a positioning function of a fuel injection valve in a rotation direction while allowing tilting operation toward a connection pipe.SOLUTION: A fuel injection valve 1 of the present invention has a holder 3, and is attached to a connection pipe 2 by being biased toward an engine by the biasing force from the holder 3. The holder 3 has a rotation stopper 33 that abuts against the connection pipe 2 of a fuel pipe and positions a rotational direction of the fuel injection valve 1 around a central axial line 1a. The rotation stopper 33 has a through hole 33a.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a fuel injection valve that injects fuel.

Background Art

[0002] A holding device provided between a fuel injection valve and a connecting pipe of a fuel distribution pipe is described in Patent Document 1 (see paragraph 0018 and FIG. 1). The holding device has a partially ring-shaped base element and a holding bracket bent and extending from the base element, and presses the fuel injection valve and the fuel distribution pipe against the cylinder head housing hole without a radial force. The holding bracket abuts against the downstream end face of the connecting pipe in the incorporated state.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Hereinafter, the holding device is referred to as a holder, and the holding bracket of the holding device is referred to as a spring portion for explanation. Also, the fuel distribution pipe is referred to as a fuel pipe for explanation.

[0005] The holder has a rotation stopper for positioning the fuel injection valve in the rotational direction with respect to the fuel pipe. The rotation stopper extends from the holder toward the connecting pipe of the fuel pipe and is locked in a recess provided on the outer peripheral surface of the connecting pipe, thereby positioning the fuel injection valve in the rotational direction with respect to the fuel pipe. Here, the rotational direction is the rotational direction centered on the central axis of the fuel injection valve.

[0006] The rotation stopper is integrated with the spring part at the root. When the spring part receives a force in the contracting direction, the rotation stopper tilts toward the connection pipe of the fuel pipe in conjunction with the spring part. Therefore, the rotation stopper needs to allow the tilting operation toward the connection part side. On the other hand, if the rigidity of the rotation stopper in the rotation direction decreases, the function of positioning the fuel injection valve in the rotation direction decreases.

[0007] An object of the present invention is to provide a fuel injection valve provided with a holder capable of suppressing a decrease in the positioning function of the fuel injection valve in the rotation direction while allowing the tilting operation toward the connection pipe side.

Means for Solving the Problems

[0008] To achieve the above object, the fuel injection valve of the present invention has a holder and is a fuel injection valve that is biased toward the engine side by the biasing force from the holder and is attached to the connection pipe of the fuel pipe, wherein the holder has a rotation stopper that abuts against the connection pipe and positions the fuel injection valve in the rotation direction around the central axis of the fuel injection valve, and the rotation stopper has a through hole.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a fuel injection valve provided with a holder capable of suppressing a decrease in the positioning function of the fuel injection valve in the rotation direction while allowing the tilting operation toward the connection part side.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

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Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

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Figure 11

Figure 12

Figure 13

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] An embodiment of the present invention will be described with reference to the drawings. With reference to FIG. 1, the configuration of the fuel injection valve 1 will be described. FIG. 1 is an external view of the fuel injection valve 1 according to an embodiment of the present invention.

[0012] 1a indicates the central axis of the fuel injection valve 1, and 2a indicates the central axis of the connecting pipe 2 of the fuel pipe. In FIG. 1, for clarity, the central axis 1a and the central axis 2a are drawn so as to pass outside the fuel injection valve 1 and the connecting pipe 2, respectively, but the central axis 1a passes through the inside of the fuel injection valve 1, and the central axis 2a passes through the inside of the connecting pipe 2.

[0013] The central axis 1a of the fuel injection valve 1 coincides with the axis of the mover (mover axis), which is provided inside the fuel injection valve 1 and not shown in the figure. The mover is a moving part integrally provided with a valve body not shown in the figure, and the mover axis may also be referred to as the valve axis.

[0014] In FIG. 1, the upper end portion (upper end side) will be referred to as the base end portion (base end side), and the lower end portion (lower end side) will be referred to as the tip end portion (tip end side). The terms base end portion (base end side) and tip end portion (tip end side) are based on the fuel flow direction. That is, the fuel flows from the upper end portion (base end portion) to the lower end portion (tip end portion) of the fuel injection valve 1. The up-and-down relationship described in this specification is defined based on FIG. 1 and does not necessarily coincide with the up-and-down direction when the fuel injection valve 1 is mounted on an internal combustion engine.

[0015] A fuel supply port 11 (see FIG. 5) is provided at the base end portion of the fuel injection valve 1, and a fuel injection hole 12 is provided at the tip end portion of the fuel injection valve 1. The fuel flowing into the fuel injection valve 1 from the fuel supply port 11 flows toward the tip end portion of the fuel injection valve 1 and is injected outside the fuel injection valve 1 from the fuel injection hole 12.

[0016] A valve portion composed of a valve body and a valve seat (not shown) is formed at the tip end portion of the fuel injection valve 1. By the valve body coming into contact with and separating from the valve seat, the opening and closing of the fuel passage are performed. That is, when the valve body contacts the valve seat, the fuel passage is closed and the fuel injection is stopped, and when the valve body separates from the valve seat, the fuel passage is opened and the fuel injection is performed.

[0017] The fuel injection valve 1 of this embodiment is an electromagnetic drive type fuel injection valve, and an electromagnetic drive unit (not shown) is provided in an intermediate portion in the direction along the central axis 1a of the fuel injection valve 1. The electromagnetic drive unit includes a fixed core, a movable core provided on the mover, an electromagnetic coil, and a spring that biases the mover in the valve closing direction. By energizing the electromagnetic coil, an electromagnetic force acts between the fixed core and the movable core, and the mover provided with the movable core is attracted toward the fixed core side. At this time, the valve body provided on the mover separates from the valve seat to open the valve, and fuel injection is performed. When the energization of the electromagnetic coil is stopped, the electromagnetic force acting between the fixed core and the movable core disappears, the mover is pushed back in the valve closing direction by the spring, and the valve body provided on the mover abuts against the valve seat to close the valve.

[0018] The fuel injection valve 1 is provided with a connector 13 to which an external wiring is connected to energize the electromagnetic coil. The connector 13 is integrally formed with a resin cover (resin molding portion) 14 that covers the outer surface of the fuel injection valve 1 by a resin material.

[0019] On the tip side of the fuel injection valve 1 with respect to the resin cover 14, a nozzle portion 15 made of a metal material is provided. The fuel injection hole 12 is provided at the tip of the nozzle portion 15. A seal member 16 is provided at the small diameter portion 15a of the nozzle portion 15. The small diameter portion 15a of the nozzle portion 15 is inserted into an insertion hole provided in the engine, and the seal member 16 seals to maintain airtightness and liquid tightness between the fuel injection valve 1 and the inner peripheral surface of the insertion hole.

[0020] The fuel injection valve 1 is biased toward the engine side by a holder 3 in a state where the nozzle portion 15 is inserted into an insertion hole provided in the engine and the fuel supply port 11 (see FIG. 5) is inserted into the connecting pipe 2 of the fuel pipe. At this time, the fuel injection valve 1 is pressed toward the engine side by the holder 3 provided between the fuel injection valve 1 and the connecting pipe 2 in a state where the lower portion 15c of the large diameter portion 15b abuts against the engine side.

[0021] The fuel injection valve 1 is subjected to a force that causes it to float from the engine due to fluctuations in fuel pressure during operation. At this time, the holder 3 biases the fuel injection valve 1 toward the engine side to prevent or suppress the fuel injection valve 1 from floating from the engine.

[0022] Note that various forms of electromagnetic drive mechanisms for fuel injection valves are known, and the fuel injection valve 1 can be applied in various forms in addition to the above-described configuration. Further, the fuel injection valve 1 is not limited to an electromagnetic drive type with respect to the drive mechanism of the mover, that is, the drive mechanism of the valve body, and other drive methods can be adopted.

[0023] Next, with reference to FIGS. 2 to 4, the configuration of the holder 3 of the present embodiment will be described. FIG. 2 is a perspective view showing the appearance of the holder 3 according to an embodiment of the present invention. FIG. 3 is a right side view of the holder 3 as viewed from the right side of the holder 3 in FIG. 2. FIG. 4 is a rear view of the holder 3 as viewed from the rear side of the holder 3 in FIG. 2.

[0024] In the present embodiment, a direct injection type fuel injection valve (DI injector) that directly injects fuel into the cylinder of the engine is targeted. The direct injection type fuel injection valve 1 is connected to the connecting pipe 2 of the fuel pipe and supplied with high-pressure fuel, and is subjected to a strong force that causes it to float from the engine side due to fluctuations in fuel pressure during operation. The holder 3 is used when attaching the fuel injection valve 1 to the connecting pipe 2 of the fuel pipe, and biases the fuel injection valve 1 toward the engine side so that the fuel injection valve 1 does not float from the engine side due to fluctuations in fuel pressure during operation.

[0025] The holder 3 is configured as, for example, a punched and bent part. The holder 3 has a portion 31 that abuts against the fuel injection valve 1 side and a portion 32 that abuts against the connecting pipe 2 side of the fuel pipe. In the following description, the front-rear direction, left-right direction, and up-down direction are defined as shown in FIG. 2 and will be described. Note that the front-rear direction, left-right direction, and up-down direction shown in FIG. 2 do not necessarily coincide with the front-rear direction, left-right direction, and up-down direction when the fuel injection valve 1 is mounted on the internal combustion engine. Further, the rear portion may be referred to as the back surface for explanation.

[0026] The portion 31 that abuts on the fuel injection valve 1 side is configured as a flat base portion. The base portion 31 has a notch portion 31D into which the fuel supply port 11 (see FIG. 5) of the fuel injection valve 1 is inserted. The notch portion 31D is formed in a shape that cuts the base portion 31 from the front edge of the base portion 31 toward the back side. In other words, the base portion 31 has two (a pair) of extended portions 31A and 31B that extend from the back side toward the front edge side. The two extended portions 31A and 31B are connected by a portion (connection portion) 31C on the back side of the base portion 31.

[0027] The portion 32 that abuts on the connection pipe 2 side of the fuel pipe is configured as a spring portion formed by being bent upward (toward the connection pipe 2 side) from the base portion 31. The spring portion 32 has an erected portion 32C that is bent upward from the base portion 31 and erected, and two (a pair) of elastically deformable portions 32A and 32B that are bent further toward the front edge side from the erected portion 32C and extend.

[0028] The pair of elastically deformable portions 32A and 32B are provided above the pair of extended portions 31A and 31B. The erected portion 32C constitutes a connection portion that connects the pair of elastically deformable portions 32A and 32B and connects to the base portion 31. The elastically deformable portions 32A and 32B have curved portions 32Aa and 32Ba that are bent from the erected portion 32C toward the front edge side of the base portion 31 and curve so as to be convex in a direction away from the base portion 31. The elastically deformable portions 32A and 32B abut on the downstream end face 2a of the connection pipe 2 in a state where they are assembled between the fuel injection valve 1 and the connection pipe 2 of the fuel pipe.

[0029] The holder 3 is provided with a rotation stopper 33 for positioning the fuel injection valve 1 in the rotational direction with respect to the fuel pipe. The rotation stopper 33 is erected upward from the middle portion in the left - right direction of the erected portion 32C of the spring portion 32. For this reason, the rotation stopper 33 is positioned between the two elastically deformable portions 32A and 32B. The rotation stopper 33 is provided with a through - hole 33a. Here, the through - hole 33a refers to a space whose entire circumference is closed by the inner peripheral surface of the hole.

[0030] Next, with reference to FIGS. 5 and 6, a state in which the fuel injection valve 1 is connected to the connecting pipe 2 of the fuel pipe by the holder 3 of this embodiment will be described. FIG. 5 is a cross-sectional view showing a state in which the fuel injection valve 1 is connected to the connecting pipe 2 of the fuel pipe by the holder of FIG. 2. FIG. 6 is an external view of the state in which the fuel injection valve 1 is connected to the connecting pipe 2 of the fuel pipe as viewed from a direction different from that of FIG. 5.

[0031] In a state where the nozzle portion 15 of the fuel injection valve 1 is inserted into an insertion hole provided in the engine and the fuel supply port 11 of the fuel injection valve 1 is inserted into the connecting pipe 2 of the fuel pipe, when the holder 3 is assembled between the fuel injection valve 1 and the connecting pipe 2, the state shown in FIGS. 5 and 6 is obtained. At this time, in the fuel injection valve 1, the lower portion 15c (see FIG. 1) of the large-diameter portion 15b is in contact with the engine side. In the holder 3, the extending portions 31A and 31B of the base portion 31 are in contact with a stepped surface 11a provided in the vicinity of the fuel supply port 11, and the elastic deformation portions 32A and 32B of the spring portion 32 are in contact with the downstream end surface 2a of the connecting pipe 2. Thereby, the fuel injection valve 1 is assembled between the engine and the fuel pipe in a state of being biased toward the engine side by the holder 3.

[0032] The holder 3 is provided with a rotation stopper 33, and by engaging the rotation stopper 33 with a positioning recess 2b provided on the outer peripheral surface of the connecting pipe 2, the rotation direction of the fuel injection valve 1 with respect to the fuel pipe is positioned. An annular seal ring 17 is provided on the outer peripheral side of the fuel supply port 11. In a state where the fuel supply port 11 is inserted into the inner peripheral side of the connecting pipe 2, the seal ring 17 maintains liquid tightness between the outer peripheral surface of the fuel supply port 11 and the inner peripheral surface of the connecting pipe 2.

[0033] The elastic deformation portions 32A and 32B are provided with curved portions 32Aa and 32Ba. By the elastic deformation of the curved portions 32Aa and 32Ba, the spring force in the spring portion 32 is exerted. When the curved portions 32Aa and 32Ba elastically deform as shown by an arrow A1 in FIG. 5, the standing portion 32C to which the elastic deformation portions 32A and 32B are connected elastically deforms as shown by an arrow A2. Along with this, the rotation stopper 33 connected to the standing portion 32C elastically deforms as shown by an arrow A3.

[0034] The rotation stopper 33 that has been elastically deformed is pressed against the connecting pipe 2 and receives a reaction force from the connecting pipe 2. If the holder 3 is displaced laterally due to the reaction force from the connecting pipe 2, a bias will occur in the pressing force of the holder 3 against the fuel injection valve 1. When a bias occurs in the pressing force applied to the fuel injection valve 1, an axial displacement will occur in the fuel injection valve 1. In order to suppress the axial displacement of the fuel injection valve 1, it is necessary to reduce the reaction force that the holder 3 receives from the connecting pipe 2.

[0035] In the holder 3 of this embodiment, by providing a through hole 33a in the rotation stopper 33, the force (pressing force) with which the rotation stopper 33 presses the connecting pipe 2 is weakened, thereby reducing the reaction force received from the connecting pipe 2. That is, the through hole 33a provided in the rotation stopper 33 constitutes a pressing force reduction portion that reduces the force pressing the connecting pipe 2. The pressing force reduction portion 33a reduces the rigidity of the rotation stopper 33 in the direction toward the central axis 1a and facilitates the displacement or deformation (hereinafter referred to as axial displacement) of the rotation stopper 33 with respect to the standing portion 32C in the direction toward the central axis 1a. That is, the magnitude of the axial displacement of the rotation stopper 33 is related to the magnitude of the rigidity of the rotation stopper 33 in the direction toward the central axis 1a. The smaller the rigidity, the larger the axial displacement of the rotation stopper 33 with respect to the standing portion 32C, and the larger the rigidity, the smaller the axial displacement of the rotation stopper 33 with respect to the standing portion 32C.

[0036] In order to weaken the force with which the rotation stopper 33 presses the connecting pipe 2, a constricted portion may be provided in the rotation stopper 33. However, if a constricted portion is provided in the rotation stopper 33, the rigidity of the rotation stopper 33 in the rotational direction centered on the central axis 1a of the fuel injection valve 1 will be greatly reduced, and the positioning function of the fuel injection valve 1 in the rotational direction will be degraded. Therefore, in the holder 3 of this embodiment, by providing a through hole 33a in the rotation stopper 33, a decrease in the rigidity of the rotation stopper 33 in the rotational direction is suppressed.

[0037] Thus, the pressing force reduction portion 33a needs to increase the axial displacement of the rotation stopper 33 with respect to the standing portion 32C and decrease the displacement of the rotation stopper 33 in the rotational direction (hereinafter referred to as rotational direction displacement). In other words, the pressing force reduction portion 33a needs to reduce the rigidity of the rotation stopper 33 in the direction toward the central axis 1a and increase the rigidity of the rotation stopper 33 in the rotational direction.

[0038] Here, with reference to FIGS. 7 and 8, the analysis results of the rigidity of the rotation stopper 33 when the pressing force reduction portion 33a (constriction portion or through hole) is provided in the rotation stopper 33 will be described. FIG. 7 shows the analysis results of the rotational direction displacement when the constriction portion or through hole is provided in the rotation stopper 33. FIG. 8 is a diagram plotting the rotational direction displacement in each shape of the constriction portion or through hole from the analysis results of FIG. 7. In FIG. 7, only the portion of the rotation stopper 33 where the pressing force reduction portion 33a is formed is shown.

[0039] In FIGS. 7 and 8, (a) shows the case where the shape of the pressing force reduction portion 33a is a constricted shape, (b) shows the case where the shape of the pressing force reduction portion 33a is a square through hole, (c) shows the case where the shape of the pressing force reduction portion 33a is an elliptical through hole having a major axis along the longitudinal direction of the rotation stopper 33, (d) shows the case where the shape of the pressing force reduction portion 33a is a circular through hole, and (e) shows the analysis results in the case where the shape of the pressing force reduction portion 33a is an elliptical through hole having a minor axis along the longitudinal direction of the rotation stopper 33. In (a) to (e), the size of the pressing force reduction portion 33a in the width direction of the rotation stopper 33 is adjusted so that the axial displacements are aligned.

[0040] In the following description, the "aspect ratio" in the elliptical shape is, as shown in FIG. 7, the ratio (lateral dimension / longitudinal dimension) of the lateral dimension to the longitudinal dimension when the dimension in the direction along the longitudinal direction of the rotation stopper 33 is the longitudinal dimension and the dimension in the direction perpendicular to the longitudinal direction of the rotation stopper 33 is the lateral dimension. The longitudinal direction of the rotation stopper 33 is the direction along the central axis 1a of the fuel injection valve.

[0041] As shown in Fig. 8, the rotational displacement in (b) to (e) with the pressing force reduction portion 33a being a through-hole is smaller than the rotational displacement in (a) with the pressing force reduction portion 33a being a constricted shape. In (b) to (e) where the pressing force reduction portion 33a is a through-hole, it can be seen that the rigidity of the rotation stopper 33 in the rotational direction can be increased compared to (a) where the pressing force reduction portion 33a is a constricted shape.

[0042] When the pressing force reduction portion 33a is a circular or elliptical through-hole, in (c) which is an ellipse having a major axis along the longitudinal direction of the rotation stopper 33, the rotational displacement is larger than that in (b) where the pressing force reduction portion 33a is a square through-hole. However, in (d) which is circular and (e) which is an ellipse having a minor axis along the longitudinal direction of the rotation stopper 33, the rotational displacement is smaller than that in (b). The dimension of the narrowest portion in the width direction of the rotation stopper 33 is such that the dimension e1 in (e) is smaller than the dimension c1 in (c). However, the dimension of the rotation stopper 33 in the longitudinal direction is larger in (c) than in (e), and the length of the narrow portion near the narrowest portion is larger in (c) than in (e). Therefore, it is considered that the rigidity against the rotational displacement becomes smaller in (c).

[0043] From the above, it is preferable that the pressing force reduction portion 33a is a circular through-hole or an elliptical through-hole having a minor axis along the longitudinal direction of the rotation stopper 33. Further, it is more preferable that the pressing force reduction portion 33a is an elliptical through-hole having a minor axis along the longitudinal direction of the rotation stopper 33 rather than a circular through-hole.

[0044] Referring to Figs. 9 and 10, the axial displacement and rotational displacement when the pressing force reduction portion 33a is formed in an elliptical shape and the aspect ratio of the elliptical shape is changed will be described. Fig. 9 is a diagram showing the change in the axial displacement when the aspect ratio of the elliptical shape of the pressing force reduction portion is changed. Fig. 10 is a diagram showing the change in the rotational displacement when the aspect ratio of the elliptical shape of the pressing force reduction portion is changed.

[0045] When the aspect ratio of the elliptical shape of the pressing force reduction portion 33a described with reference to FIG. 7 is changed, the axial displacement and the rotational displacement of the rotation stopper 33 change as shown in FIGS. 9 and 10. The axial displacement and the rotational displacement significantly decrease when the aspect ratio is between 0.0 and 2.5, and settle at substantially constant values when the aspect ratio is 2.5 or more.

[0046] As described above, the pressing force reduction portion 33a needs to reduce the rigidity of the rotation stopper 33 in the direction toward the central axis 1a to increase the axial displacement of the rotation stopper 33, and increase the rigidity of the rotation stopper 33 in the rotational direction to reduce the rotational displacement. Therefore, when the pressing force reduction portion 33a is an elliptical through-hole, from the analysis results in FIG. 10, it is preferable that the aspect ratio is 2.5 or more. On the other hand, since the axial displacement decreases as the aspect ratio increases, it would be better if the aspect ratio is smaller. However, the unit of the rotational displacement in FIG. 10 is [μm], while the unit of the axial displacement in FIG. 9 is [mm], and sufficient displacement (rigidity) is ensured for the axial displacement even when the aspect ratio is 2.5 or more.

[0047] Therefore, when the pressing force reduction portion 33a is an elliptical through-hole, it is preferable that the aspect ratio of the elliptical shape is 2.5 or more. Thereby, the reduction effect of the rotational displacement of the rotation stopper 33 is improved. In addition, considering the safety factor, it is preferable that the aspect ratio is 9 or less so that the axial stress generated in the rotation stopper 33 does not reach the breaking stress.

[0048] With reference to FIGS. 11 to 13, the axial displacement and the rotational displacement when the pressing force reduction portion 33a has an elliptical shape and its hole height position is changed will be described. FIG. 11 is an explanatory diagram of the hole height positions in FIGS. 12 and 13. FIG. 12 is a diagram showing the change in the axial displacement when the hole height position is changed. FIG. 13 is a diagram showing the change in the rotational displacement when the hole height position is changed.

[0049] As shown in FIG. 11, the connection portion between the rotation stopper 33 and the standing portion 32C of the spring portion 32 is set to a height of 0.0 [mm], and the hole position height is set such that the hole position in the longitudinal direction of the rotation stopper 33 becomes higher toward the upper end (tip) of the rotation stopper 33. The hole position is set to the position of the intersection of the major axis and the minor axis of the elliptical shape. In FIG. 11, the pressing force reduction portion 33a disposed at a hole position height of 0.0 [mm] is shown.

[0050] As shown in FIG. 13, the rotational displacement is minimized when the hole position height is 0.0 [mm], and has a maximum value (an inverted white triangle) around when the hole position height exceeds 2.0 [mm]. Therefore, the hole position height is set in the range of 0.0 to 2.0 [mm] so as to avoid the maximum value of the rotational displacement. In this case, the hole position of the elliptical through-hole constituting the pressing force reduction portion 33a is set to the position of the intersection of the major axis and the minor axis of the elliptical shape. When the hole position height is 0.0 [mm], the intersection of the major axis and the minor axis is disposed at the lower end portion of the rotation stopper 33.

[0051] As shown in FIG. 12, the range of 0.0 to 2.0 [mm] of the hole position height includes the maximum value of the axial displacement, and it can be said that it is appropriate as the arrangement of the pressing force reduction portion 33a even when considering the axial displacement.

[0052] The fuel injection valve 1 of this embodiment has the following characteristics. (1) A fuel injection valve 1 having a holder 3, biased toward the engine side by the biasing force from the holder 3, and attached to the connection pipe 2 of the fuel pipe, The holder 3 has a rotation stopper 33 that abuts against the connection pipe 2 and positions the fuel injection valve 1 in the rotational direction about the central axis 1a of the fuel injection valve 1. The rotation stopper 33 has a through-hole 33a.

[0053] (2) The through-hole 33a is configured to form a space closed by the inner peripheral surface of the through-hole 33a.

[0054] (3) The through-hole 33a is circular or elliptical.

[0055] (4) The through-hole 33a is elliptical, When the elliptical shape of the through-hole 33a has a longitudinal dimension in the direction along the central axis line 1a and a lateral dimension in the direction perpendicular to the central axis line 1a, the aspect ratio obtained by dividing the lateral dimension by the longitudinal dimension is 2.5 or more.

[0056] (5) The elliptical shape of the through-hole 33a has an aspect ratio of 9 or less.

[0057] (6) The intersection of the major axis and the minor axis of the elliptical shape of the through-hole 33a is arranged in the range of 0.0 to 2.0 [mm] from the lower end portion of the rotation stopper 33.

[0058] (7) The holder 3 has, in addition to the rotation stopper 33, a base portion 31 that forms a flat plate shape and abuts on the side of the fuel injection valve 1, and a spring portion 32 that is bent from the base portion 31 toward the side of the connection pipe 2 and abuts on the side of the connection pipe 2. The spring portion 32 has an erected portion 32C that is bent from the base portion 31 toward the side of the connection pipe 2 and erected, and two elastic deformation portions 32A and 32B that are bent from the erected portion 32C toward the front edge side of the holder 3 and extend. The rotation stopper 33 has a lower end portion connected to the erected portion 32C of the spring portion 32 between the two elastic deformation portions 32A and 32B.

Explanation of Reference Numerals

[0059] 1... fuel injection valve, 1a... central axis line of the fuel injection valve 1, 2... connection pipe of the fuel pipe, 3... holder, 31... base portion, 32... spring portion, 32A, 32B... elastic deformation portions, 32C... erected portion, 33... rotation stopper, 33a... through-hole.

Claims

1. A fuel injection valve having a holder, the fuel injection valve being biased toward an engine by a biasing force from the holder and being attached to a connection pipe of a fuel pipe, the holder has a rotation stopper that abuts against the connecting pipe to position the fuel injection valve in a rotational direction about a central axis of the fuel injection valve, The rotation stopper is a fuel injection valve having a through hole.

2. 2. The fuel injection valve according to claim 1, The through hole is configured to form a closed space with an inner circumferential surface of the through hole.

3. 3. The fuel injection valve according to claim 2, The through hole of the fuel injection valve is circular or elliptical in shape.

4. 4. The fuel injection valve according to claim 3, The through hole is elliptical in shape, a fuel injection valve in which the elliptical shape of the through hole has an aspect ratio, obtained by dividing the horizontal dimension by the vertical dimension, of 2.5 or greater, where the dimension along the central axis is the vertical dimension and the dimension perpendicular to the central axis is the horizontal dimension.

5. 5. The fuel injection valve according to claim 4, A fuel injection valve, wherein the elliptical shape of the through hole has an aspect ratio of 9 or less.

6. 6. The fuel injection valve according to claim 4 or 5, The through hole is a fuel injection valve in which the intersection of the major axis and minor axis of the elliptical shape is located within a range of 0.0 to 2.0 mm from the lower end of the rotation stopper.

7. 7. The fuel injection valve according to claim 6, the holder has, in addition to the rotation stopper, a base portion formed in a flat plate shape and abutting against the fuel injection valve, and a spring portion formed by bending from the base portion toward the connecting pipe and abutting against the connecting pipe, the spring portion has an erected portion bent from the base portion toward the connecting pipe and erected, and two elastic deformation portions bent from the erected portion toward a front edge side of the holder, The rotation stopper is a fuel injection valve, the lower end of which is connected to the erected portion of the spring portion between the two elastic deformation portions.

8. 4. The fuel injection valve according to claim 1, The through hole is elliptical in shape, The through hole is a fuel injection valve in which the intersection of the major axis and minor axis of the elliptical shape is located within a range of 0.0 to 2.0 mm from the lower end of the rotation stopper.

Images