JP5423865B2 - Fuel injection device and clamp member - Google Patents

Description

  The present invention relates to a fuel injection device including a fuel supply pipe and a clamp member that holds a fuel injection valve that injects fuel supplied from the fuel supply pipe into a combustion chamber of an internal combustion engine, and the clamp member. It is about.

  A fuel injection device includes a fuel injection valve that injects fuel into each cylinder of an internal combustion engine (engine), a fuel supply pipe that supplies fuel to the fuel injection valve, and a fuel injection valve and a fuel supply pipe that are connected to each other. And a holding clamp. As a prior art of such a fuel injection device, there is an injector clamping device disclosed in Patent Document 1 below.

Japanese Patent Laid-Open No. 9-100780

  In the above-described clamp device of Patent Document 1, since the fuel supply pipe and the fuel injection valve can be held in a connected state, a plurality of fuel injection valves corresponding to a plurality of cylinders of the internal combustion engine are connected and held in advance in the fuel supply pipe. Thus, a plurality of fuel injection valves can be inserted and assembled into the mounting hole of the internal combustion engine simultaneously with the fuel supply pipe.

  However, after inserting and assembling the fuel injection valve into the mounting hole of the internal combustion engine, if the fuel injection valve is not pressed in the direction of the central axis for each fuel injection valve using another presser clamp or the like, it will be exerted from the combustion chamber to the fuel injection valve. There is a problem that the position of the fuel injection valve cannot be maintained with respect to the combustion pressure, and each fuel injection valve cannot be reliably fixed in each mounting hole of the internal combustion engine.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to hold the fuel supply pipe and the fuel injection valve in a connected state, and to an internal combustion engine. An object of the present invention is to provide a fuel injection device and a clamp member capable of applying an optimum supporting force for securely fixing the fuel injection valve in the mounting hole after the fuel injection valve is inserted and assembled.

In order to achieve the above object, the present invention employs the following technical means. That is, according to the first aspect of the present invention, the clamp that holds the fuel injection valve (20) that injects fuel into the internal combustion engine in a state of being inserted and connected to the fuel supply pipe (11) that supplies fuel to the fuel injection valve. A fuel injection device comprising members (30A, 30B),
The fuel injection valve has a locking surface (26) for locking the clamp member,
The clamping member, extending the main surface portion (31), engaging portions that abolish engages the locking surface (33), from the main surface portion to produce the spring force in a direction away the fuel supply pipe and the fuel injection valve and a spring portion (34) and have a, by the locking portion is engaged with the locking surface, the fuel injection valve is characterized in that it is held between the engaging portion and the main surface portion.

  According to the first aspect of the present invention, the clamp member can be assembled with the fuel injection valve inserted and connected to the fuel supply pipe. As a result, the locking portion of the clamp member is locked to the locking surface of the fuel injection valve at the predetermined insertion position, so that the fuel injection valve is held between the locking portion and the main surface portion. Therefore, the clamp member is not displaced or dropped from the predetermined position.

  Further, after the fuel injection valve is inserted and assembled in the internal combustion engine, the spring force of the spring portion of the clamp member opposes the combustion chamber that works to push up the fuel injection valve from the combustion chamber of the internal combustion engine, and Can hold position. That is, an optimum supporting force for securely fixing the fuel injection valve in the mounting hole can be applied, and a stable clamp load can be applied to the fuel injection valve.

  Further, in the invention according to claim 2, when the central axis of the fuel injection valve is set to the vertical direction in the fuel injection device according to claim 1, each of the fuel injection valves has a predetermined width in the horizontal direction. The clamp member has a two-surface width portion (25) composed of a surface and a locking surface provided on one end side in the left-right horizontal direction of the two-surface width portion, and the clamp member extends along both surfaces of the two-surface width portion. It has a two-surface clamping part (32) extended from the left and right portions of the main surface part, and a locking part that is provided on the distal end side of the two-surface clamping part and latches to the locking surface. According to the second aspect of the present invention, the clamp member can be easily assembled from the horizontal (lateral) direction with the fuel injection valve inserted and connected to the fuel supply pipe. A clamping part clamps this along both surfaces of a two-surface width part, and the direction around an axis | shaft is decided.

According to a third aspect of the present invention, in the fuel injection device according to the first or second aspect, the clamp member (30B) extends from the main surface portion between the spring portions extending upward from the left and right portions of the main surface portion. A locking projection (35) extends upward, and a locking shape (351) is formed on the distal end side of the locking projection, and the locking shape is formed in a step portion (D ). According to the third aspect of the present invention, it is possible to increase the locking force between the fuel injection valve and the clamp member and the fuel supply pipe, thereby obtaining a more firmly held state.

In the invention according to claim 4, the fuel injection valve (20) for injecting fuel into the combustion chamber of the internal combustion engine is held in a state of being inserted and connected to the fuel supply pipe (11) for supplying fuel to the fuel injection valve. A clamping member that
The locking portion (33) that holds the fuel injection valve between the main surface portion (31) and the main surface portion by locking with the locking surface of the fuel injection valve, and the fuel supply pipe and the fuel injection valve are moved away from each other. Since it has the spring part (34) extended from the main surface part so that the spring force of a direction may be produced, the effect similar to the invention of Claim 1 is acquired.

  According to a fifth aspect of the present invention, in the clamp member according to the fourth aspect, when the central axis of the fuel injection valve is set in the vertical direction, the clamp member is constituted by two surfaces each having a predetermined width in the horizontal direction. In order to hold a fuel injection valve having a surface width portion (25) and a locking surface provided on one end side in the left-right horizontal direction of the two-surface width portion, the main surface portion is arranged along both surfaces of the two-surface width portion. Since it has the 2 surface clamping part (32) extended from the right-and-left part and the latching | locking part provided in the front end side of the 2 surface clamping part, and latching to a locking surface, It is characterized by the above-mentioned. The same effect as the invention described in (1) can be obtained.

  According to a sixth aspect of the present invention, in the clamp member according to the fourth or fifth aspect, the locking protrusion (35) extends upward from the main surface portion between the spring portions extending from the left and right portions of the main surface portion. And a locking shape (351) for locking to the upper surface of the stepped portion (D) formed in the fuel supply pipe is formed on the distal end side of the locking projection. Therefore, the same effect as that of the invention of claim 3 can be obtained. In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

1 is a perspective view showing a fuel injection device 1 according to a first embodiment of the present invention. It is II-II partial sectional drawing in FIG. It is a perspective view which shows the state before the combination of the fuel-injection apparatus 1 of FIG. It is a perspective view showing clamp member 30A in the 1st example of the present invention. It is a perspective view which shows the clamp member 30B in 2nd Example of this invention.

(First embodiment)

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view showing a fuel injection device 1 according to a first embodiment of the present invention, and FIG. 2 is a partial cross-sectional view taken along the line II-II in FIG. The fuel injection device 1 according to this embodiment includes a fuel supply pipe, a fuel injection valve 20, and a clamp member 30A.

  The fuel supply pipe is for distributing and supplying fuel to each cylinder of the engine (internal combustion engine), and is connected to a fuel injection valve 20 provided for each cylinder (fuel supply pipe referred to in the present invention). 11 is provided. The connecting pipe 11 has a large-diameter portion (stepped portion) D that is increased radially outward at the end on the fuel injection valve 20 side.

  FIG. 3 is a perspective view showing a state before the fuel injection device 1 of FIG. 1 is combined. In this embodiment, first, the fuel injection valve 20 is inserted and connected to the connection pipe 11, and then the clamp member 30 </ b> A is fitted from the horizontal (lateral) direction to hold the connection state between the connection pipe 11 and the fuel injection valve 20. It has become.

  As shown in FIG. 3, the fuel injection valve 20 directly injects fuel from a nozzle 23 portion at the tip into a combustion chamber of an engine cylinder (not shown). The fuel inlet 21 of the fuel injection valve 20 is inserted into the connection pipe 11 and the space between the connection pipe 11 and the fuel inlet 21 is sealed by an O-ring 22a as a seal member.

  Further, the nozzle 23 portion of the fuel injection valve 20 is inserted into an engine cylinder (not shown) and sealed by a seal ring 22b as a seal member. The fuel injection valve 20 is electrically driven, and by controlling the drive current supplied from the connector 24 to the internal coil, the lift of the internal nozzle needle is controlled and the fuel injection is controlled.

  Further, as shown in FIG. 3, the fuel injection valve 20 of the present embodiment includes a two-surface width portion 25 having two surfaces with a predetermined width for determining the posture around the axis of the clamp member 30A, and the two-surface width. A locking surface 26 for locking the clamp member 30A on one end side in the direction of the portion 25 (left side in FIG. 3), and a positioning surface 27a for maintaining the position of the clamp member 30A above and below the two-surface width portion 25. 27b are formed.

  Note that the directions such as left and right, up and down, and before and after described below correspond to the directions indicated by arrows in each drawing. FIG. 4 is a perspective view showing the clamp member 30A in the first embodiment of the present invention. As shown in FIG. 4, the clamp member 30 </ b> A of this embodiment extends from the left and right sides of the main surface portion 31 so as to extend along the both surfaces of the two-surface width portion 25 of the fuel injection valve 20 (see FIG. 2). A two-surface clamping portion 32 (referred to as a first arm portion) that clamps the width portion 25 is provided.

  Further, a locking portion 33 that locks to the locking surface 26 of the fuel injection valve 20 is provided on each of the front end sides of the two-surface clamping portion 32. In the left-right direction of FIG. 4, the locking portion 33 can be deformed in the opening direction while having a spring property in the closing direction, and the interval between the side plate portions facing each other than the two-surface sandwiching portion 32 is small. The fuel injection valve 20 inserted into the surface clamping portion 32 is prevented from falling off from the opening side of the first arm portion to the radially outer side. Specifically, the locking portion 33 in the present embodiment is a slope corresponding to the locking surface 26.

  In addition, when connected to the fuel supply pipe 11, a J-shaped spring portion (second portion) extended from the left and right upper sides of the main surface portion 31 so as to be inserted into a groove portion 12 described later (see FIG. 1). 34). This spring force works in a direction to move the fuel injection valve 20 and the connection pipe 11 away from each other, and can hold the position of the fuel injection valve 20 against the combustion pressure that works to push up the fuel injection valve 20 from the combustion chamber of the engine. . The fuel injection valve 20 is inserted between the two-surface sandwiching portion 32 and the spring portion 34.

  In the large-diameter portion D of the connecting pipe 11, the groove portions 12 formed in parallel to the horizontal direction so that the spring portion 34 of the clamp member 30A is inserted from the horizontal direction are formed at two locations facing the outer diameter portion in the horizontal direction. doing.

  Next, a method for manufacturing the clamp member 30A will be described. The main surface portion 31 and the first and second arm portions 32 and 34 extending from the main surface portion 31 are integrally formed of a metal plate material such as stainless steel, and are first formed on a plate member (not shown). Process). This plate member is formed, for example, by punching a plate material with a press.

  Next, the first and second arm portions 32 and 34 of the plate member are bent toward the front side of the main surface portion 31 as indicated by an arrow F in FIG. 4 (bending step). In this way, by applying a force from one surface side of the plate member and being bent toward the other surface side of the plate member so that the first and second arm portions 32 and 34 face each other across the main surface portion 31, A generally U-shaped clamp member 30A as shown in FIG. 4 is completed.

  At this time, a clamping member 30A having a predetermined shape as shown in FIG. 4 is formed by arranging, for example, a forming jig on the surface opposite to the surface to which the force of the main surface portion 31 is applied. As described above, the clamp member 30A is formed by a simple process of punching a plate member and bending it from one direction, thereby reducing the number of processing steps.

  Next, the features and effects of the present embodiment will be described. When the central axis of the fuel injection valve 20 is set in the vertical direction, the fuel injection valve 20 includes a two-surface width portion 25 composed of two surfaces each having a predetermined width in the horizontal direction, and left and right sides of the two-surface width portion 25. A locking surface 26 is formed on one end side in the horizontal direction, and positioning surfaces 27 a and 27 b are formed above and below the two-surface width portion 25.

  The clamp member 30 </ b> A includes a two-surface sandwiching portion 32 extending from the left and right portions of the main surface portion 31 along both surfaces of the two-surface width portion 25 of the fuel injection valve 20, and a distal end side of the two-surface sandwiching portion 32. And a locking portion 33 that locks on the locking surface 26 of the fuel injection valve 20 and extends from the left and right portions of the main surface portion 31 so as to generate a force that expands between the connecting pipe 11 and the fuel injection valve 20. The spring part 34 is formed.

  Furthermore, the groove part 12 formed in the horizontal direction so that the spring part 34 of 30 A of clamp members may be inserted from a horizontal direction is formed in two places where the outer diameter part of the connection pipe 11 opposes in the horizontal direction.

  According to this, the clamp member 30A can be easily assembled from the horizontal (lateral) direction in a state where the connection pipe 11 and the fuel injection valve 20 are connected, and when assembled, the two-surface clamping portion 32 of the clamp member 30A is The direction around the axis is determined by sandwiching the fuel injection valve 20 between the positioning surfaces 27a and 27b of the fuel injection valve 20 along both sides of the two-surface width portion 25.

  Further, the connecting pipe 11 and the clamp member 30 </ b> A are configured so that the direction around the axis is determined by the spring portions 34 entering the groove portions 12 at two locations on both sides. As a result, the direction around the axis of the fuel injection valve 20 relative to the connection pipe 11 is determined via the clamp member 30A.

  Furthermore, since the locking portion 33 of the clamp member 30A is locked to the locking surface 26 of the fuel injection valve 20 at the predetermined insertion position and is held between the main surface portion 31, the clamping member 30A It will not shift or fall out of position.

Therefore, the fuel injection valve 20 can be held in a state of being connected to the connection pipe 11 at an angle and a posture around a predetermined axis. After inserting and assembling the fuel injection valve 20 into the internal combustion engine, the repulsive force of the spring portion 34 of the clamp member 30A opposes the combustion pressure that acts to push up the fuel injection valve 20 from the combustion chamber of the engine. The position of the injection valve 20 can be maintained. That is, an optimum supporting force for securely fixing the fuel injection valve 20 in the mounting hole can be applied, and a stable clamp load can be applied to the fuel injection valve 20.
(Second embodiment)

  Next, a second embodiment of the present invention will be described. FIG. 5 is a perspective view showing a clamp member 30B in the second embodiment of the present invention. The connection pipe 11 and the fuel injection valve 20 are the same as those in the first embodiment described above, and are not shown. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and different configurations and features will be described.

  In the present embodiment, a locking projection 35 is extended upward from the main surface portion 31 between the spring portions 34 of the clamp member 30B, and a locking surface (in the present invention) is provided on the distal end side of the locking projection 35. The locking shape 351 is formed, and the locking surface 351 is locked to the upper surface of the stepped portion (large diameter portion) D formed in the connecting pipe 11.

According to this, it is possible to increase the locking force between the fuel injection valve 20 and the clamp member 30B and the connection pipe 11, and to obtain a more firm holding state. Further, the step portion D is formed as a large-diameter portion D projecting to the lower portion of the connecting pipe 11. According to this, the level | step-difference part D can be easily formed by providing the large diameter part D, and the latching force with the fuel injection valve 20, the clamp member 30B, and the connection pipe 11 can be heightened.
(Other examples)

  The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the above-described embodiments, the main surface portion 31 of the clamp members 30 </ b> A and 30 </ b> B is formed as a flat surface, but may be formed on a circumferential surface along the outer shape of the fuel injection valve 20.

DESCRIPTION OF SYMBOLS 1 ... Fuel injection apparatus 11 ... Connection pipe (fuel supply pipe)
DESCRIPTION OF SYMBOLS 12 ... Groove part 20 ... Fuel injection valve 25 ... Two-surface width part 26 ... Locking surface 27a, 27b ... Positioning surface 30A, 30B ... Clamp member 31 ... Main surface part 32 ... Two-surface clamping part 33 ... Locking part 34 ... Spring part 35 ... locking protrusion 351 ... locking surface (locking shape)
D: Stepped part, large diameter part

Claims (6)

Clamp members (30A, 30B) for holding a fuel injection valve (20) for injecting fuel into a combustion chamber of an internal combustion engine in a state of being inserted and connected to a fuel supply pipe (11) for supplying fuel to the fuel injection valve. A fuel injection device,
The fuel injection valve has a locking surface (26) for locking the clamp member,
Said clamp member, the main surface portion (31), a locking portion (33) that abolish engaged with the locking surface, to produce the direction of the spring force away said fuel supply pipe and the fuel injection valve wherein possess spring portion extending from the main surface portion (34), by the locking portion is engaged with the engagement surface, the fuel injection valve between the main surface portion and the locking portion is held The fuel injection device characterized by the above-mentioned . When the central axis of the fuel injection valve is vertical, the fuel injection valve has a two-surface width portion (25) composed of two surfaces each having a predetermined width in the horizontal direction, and the two-surface width portion. The locking surface provided on one end side of the left and right horizontal direction,
The clamp member is provided with a two-surface clamping portion (32) extending from left and right portions of the main surface portion so as to follow both surfaces of the two-surface width portion, and provided on the distal end side of the two-surface clamping portion. The fuel injection device according to claim 1, further comprising: the locking portion that is locked to a stop surface. The clamp member (30B) extends a locking protrusion (35) upward from the main surface portion between the spring portions extending upward from the left and right portions of the main surface portion, and the engagement member (30B). The locking shape (351) is formed on the tip side of the stop protrusion, and the locking shape is locked to the upper surface of the step portion (D) formed in the fuel supply pipe. The fuel injection device according to 1 or 2. A clamp member that holds a fuel injection valve (20) that injects fuel into a combustion chamber of an internal combustion engine in a state of being inserted and connected to a fuel supply pipe (11) that supplies fuel to the fuel injection valve,
A locking portion (33) for holding the fuel injection valve between the main surface portion (31) and the locking surface of the fuel injection valve to hold the fuel injection valve, the fuel supply pipe, and the fuel A clamp member comprising: a spring portion (34) extending from the main surface portion so as to generate a spring force in a direction away from the injection valve. When the central axis of the fuel injection valve is vertical, a two-surface width portion (25) composed of two surfaces each having a predetermined width in the horizontal direction, and one end side in the left-right horizontal direction of the two-surface width portion In order to hold the fuel injection valve having the locking surface provided in
A two-surface sandwiching portion (32) extending from the left and right portions of the main surface portion so as to follow both surfaces of the two-surface width portion, and provided at the distal end side of the two-surface sandwiching portion and latching to the locking surface. The clamp member according to claim 4, further comprising the locking portion.   A locking projection (35) extends upward from the main surface portion between the spring portions extended from the left and right portions of the main surface portion, and a step portion (D) formed in the fuel supply pipe (D) The clamp member according to claim 4 or 5, wherein a locking shape (351) to be locked to the upper surface of the locking protrusion is formed on the tip side of the locking protrusion.

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