JP2008014260A - Tool for disassembling fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for disassembly enabling easy disassembly of a fuel injection valve. <P>SOLUTION: A main body rotation prevention part 3 preventing rotation of an injection valve main body 102 is provided on a tool main body 2. A nozzle grip part 6 gripping an injection nozzle 103 at a tip part of a fixing nut 109 and preventing rotation of the injection nozzle 103 and releasing the injection nozzle 103 is provided at an axial position of the injection valve main body 102 of which rotation is prevented by the main body rotation prevention part 3 of the tool main body 2. Consequently, rotation of the injection valve main body 102 and the injection nozzle 103 is surely prevented and only the fixing nut 109 is rotated and is loosened. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disassembly jig for maintaining a fuel injection valve of a diesel engine.

  Conventionally, a fuel injection valve of a diesel engine has been inspected and maintained regularly or as needed, and at the time of this inspection and maintenance, it has been disassembled to replace consumable parts. For example, in the case of a ship equipped with a diesel engine, the fuel injection valve is disassembled and maintained by regularly entering a maintenance dock. The diesel engine of this ship will be described below as an example.

  As a diesel engine of a ship, for example, there is one provided with 24 fuel injection valves per ship. In this case, about 6 spare parts may be mounted. And when the ship carrying this diesel engine enters a maintenance dock, those fuel injection valves are usually maintained each time.

  FIG. 6 is a longitudinal sectional view showing an example of this type of fuel injection valve. In the case of the illustrated fuel injection valve 101, an intermediate plate 104 is provided between the injection valve main body 102 and the injection nozzle 103, between the injection valve main body 102 and the intermediate plate 104, and between the intermediate plate 104 and the injection nozzle. Positioning pins 105 and 106 are provided between the positioning pins 103 and 103. Each of the positioning pins 105 and 106 is provided on the circumference, and by the positioning pins 105 and 106, fuel supply holes 107 provided in the injection valve main body 102, the intermediate plate 104, and the injection nozzle 103, The cooling water hole 108 is positioned. Then, a fixing nut 109 is put on the base of the injection nozzle 103 so as to cover the intermediate plate 104, and a screw part 110 of the fixing nut 109 is fastened to a screw part 111 of the injection valve main body 102 to thereby connect the base of the injection nozzle 103 to the injection valve. By pressing toward the main body 102, the injection nozzle 103 and the intermediate plate 104 are fixed to the injection valve main body 102 with the tip of the injection nozzle 103 protruding from the fixed nut 109. The fuel injection valve 101 is fixed to a cylinder head 112 with a bolt 114 via a fixing member 113, and is configured to inject high-pressure fuel into the cylinder from the tip of the injection nozzle 103. Reference numeral 115 denotes a supply / exhaust valve.

  When such a fuel injection valve 101 is inspected and serviced, the bolt 114 is loosened, the fixing member 113 is removed, the fuel injection valve 101 is removed from the cylinder head 112, and the fixing nut 109 is loosened and removed to thereby inject the injection nozzle. 103, the intermediate plate 104, and the injection valve body 102 are disassembled and maintained.

As a conventional technique of this type, there is a maintenance jig for installing and fixing the fuel injection valve when maintaining the fuel injection valve of a diesel engine (see, for example, Patent Document 1).
JP 2002-266729 A (2nd page, FIG. 1)

  However, the fuel injection valve 101 has a gap between the fixed nut 109 and the injection nozzle 103 during high temperature / high pressure operation, as shown in a longitudinal sectional view of the fuel injection valve of FIG. 6 shown in FIG. Carbon 116 enters, and the fixing nut 109 and the injection nozzle 103 are fixed by the carbon 116, and the fixing nut 109 cannot be easily loosened at the time of disassembly.

  For this reason, when the fuel injection valve 101 is disassembled, the injection valve body 102 is fixed and the fixing nut 109 is loosened with an excessive force. However, when the fixing nut 109 rotates, the injection nozzle 103 fixed by the carbon 116 is also integrated. Will rotate. In the case of the configuration of the fuel injection valve 101, when the injection nozzle 103 rotates integrally with the fixing nut 109, between the injection nozzle 103 and the intermediate plate 104, and between the intermediate plate 104 and the injection valve main body 102. Slip occurs between them, and a shearing force acts on the positioning pins 105 and 106 provided between them. Since this shearing force is larger in the radius r2 from the axis C of the injection valve body 102 to the positioning pin 106 than the radius r1 from the axial center C to the positioning pin 106, an excessive shearing force acts on the positioning pin 105. .

  When an excessive shearing force is applied to the positioning pin 105 as shown in the VII-VII sectional view of FIG. 7A shown in FIG. 7B, in the case of the configuration of the fuel injection valve 101, the intermediate plate 104 is a hard member. Therefore, the positioning pin 105 is damaged and the pin hole 117 of the injection valve body 102 is deformed. If the pin hole 117 is deformed, the new positioning pin 105 cannot accurately position the intermediate plate 104 and the injection valve main body 102, and the fuel supply hole 107 and the cooling water hole 108 are shifted in the circumferential direction to cause fuel leakage or the like. May occur.

  Moreover, such damage frequently occurs. If the positioning pins 105 and 106 and the injection nozzle 103 are damaged, they can be easily restored by replacing them with new ones. However, if the injection valve main body 102 is damaged, it is expensive. Purchase of a large part is required, which increases the maintenance cost.

  If the tip of the injection nozzle 103 is forcibly gripped with another tool or the like so as to prevent the injection nozzle 103 from rotating, an attempt will be made to apply an excessive force to the injection nozzle 103. Accordingly, the reusable injection nozzle 103 is also damaged. In addition, the work of loosening the fixing nut 109 fixed with the carbon 116 and removing the injection nozzle 103 in this way requires a lot of time and labor, and is difficult and requires skill. There is also concern about the shortage.

  Although the maintenance jig described in Patent Document 1 has been proposed for fixing the valve itself, the injection nozzle fixed to the fixing nut is gripped by carbon so as not to rotate, and only this fixing nut is held. It cannot be loosened and disassembled stably.

  Accordingly, an object of the present invention is to provide a disassembly jig that can disassemble a fuel injection valve easily.

  In order to achieve the above object, the present invention provides a fuel injection valve disassembly jig in which an injection nozzle provided at the tip of an injection valve body is fixed to the injection valve body by a fixing nut, A main body rotation blocking portion for blocking the rotation of the valve main body, and the axial position of the injection valve main body for blocking the rotation by the main body rotation blocking portion of the jig main body at the distal end side of the fixing nut; There is provided a nozzle gripping part that can hold the spray nozzle to prevent the spray nozzle from rotating and to open the spray nozzle. Thus, the rotation of the injection nozzle can be prevented by the nozzle gripping portion on the distal end side of the fixed nut while the rotation of the injection valve main body is prevented by the main body rotation prevention portion, so that only the fixed nut can be reliably rotated. The fuel injection valve can be stably disassembled by loosening.

  In addition, the nozzle gripping portion is provided with a fixed gripping portion and a movable gripping portion facing the fixed gripping portion, and the gripping surface along the outer surface of the spray nozzle is provided on the fixed gripping portion and the movable gripping portion. A drive mechanism that opens and closes the gripping part close to or away from the fixed gripping part may be provided. Accordingly, the spray nozzle can be gripped by the movable gripping portion in a state where the spray nozzle is aligned with the fixed gripping portion of the nozzle gripping portion, and the spray nozzle can be easily gripped.

  Further, the movable gripping part may be configured to open and close by tilting the main body rotation prevention part side when approaching or separating from the fixed gripping part. Thereby, if the nozzle gripping part is opened, the main body rotation blocking part side of the movable gripping part tilts, and the injection nozzle of the fuel injection valve can be easily set between the movable gripping part and the fixed gripping part. .

  Further, the opening angle of the tilting movable gripping portion on the main body rotation prevention portion side may be set to an angle at which the engagement between the injection valve main body and the main body rotation prevention portion can be released when the movable gripping portion is tilted. . Thereby, when the movable holding part is opened, the fuel injection valve can be attached and detached more easily.

  Further, the main body rotation preventing portion is engaged with a locking portion of the injection valve main body to prevent the injection valve main body from rotating, and a predetermined amount of axial movement of the injection valve main body is allowed. An escape portion may be provided. As a result, when the fixing nut is loosened, the injection valve body is allowed to move in the axial direction at the escape portion while the injection valve body is prevented from rotating at the insertion portion of the main body rotation prevention portion. It can be performed.

  In addition, if the gripping surface is formed as a locking surface that increases the frictional resistance with the outer surface of the injection nozzle and prevents the tip of the injection nozzle from rotating, the injection nozzle or the like can be gripped more quickly. The disassembly work can be speeded up.

  According to the present invention, the means described above can reliably hold the injection valve body and the injection nozzle of the fuel injection valve and loosen the fixing nut, so that the fuel injection valve can be stably disassembled.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a fuel injection valve disassembly jig according to an embodiment of the present invention, and FIG. 2 is a side view of the fuel injection valve disassembly jig shown in FIG. An example in which the fuel injection valve 101 shown in FIG. Further, in this embodiment, a case will be described in which the fuel injection valve 101 is placed in a vertical state by disposing the injection nozzle 103 on the lower side (see FIG. 4 described later).

  As shown in the figure, the disassembling jig 1 includes a jig main body 2 that is a strength member extending in the axial direction (vertical direction in the figure) of the fuel injection valve 101, and a main body rotation provided on the upper portion of the jig main body 2. The prevention part 3 and the nozzle grip part 6 provided in the lower part are provided. The nozzle gripping portion 6 is provided at an axial position of the injection valve main body 102 that prevents the main body rotation preventing portion 3 of the jig main body 2 from rotating. The jig body 2 is formed in a plate shape having a predetermined thickness and extending in the axial direction of the fuel injection valve 101. Hereinafter, the side of the jig body 2 on which the main body rotation preventing portion 3 and the nozzle gripping portion 6 are provided is referred to as the front side.

  The main body rotation preventing portion 3 is provided on the upper portion of the jig main body 2 so as to protrude to the front side orthogonal to the axial direction of the fuel injection valve 101. An insertion portion 4 that opens in a U-shape is provided at the center in the width direction of the main body rotation prevention portion 3 on the side opposite to the jig body. The opening width dimension of the insertion portion 4 is such that a parallel locking portion 118 (shown in FIGS. 2 and 3) formed on the injection valve body 102 of the fuel injection valve 101 can be inserted and locked from the front side. Dimension is formed. The insertion portion 4 locks the locking portion 118 to prevent the injection valve body 102 from rotating. The thickness (vertical direction in the figure) of the main body rotation preventing portion 3 is formed to be equal to the axial dimension of the locking portion 118. Further, on the nozzle gripping portion 6 side of the main body rotation preventing portion 3, a relief portion 5 having a wide opening size of the insertion portion 4 is provided. As will be described later, the escape portion 5 keeps the injection valve body 102 in the axial direction while maintaining the state where the main body rotation prevention portion 3 prevents the injection valve body 102 from rotating when the fuel injection valve 101 is disassembled. This is to prevent contact with the main body rotation prevention unit 3 even if the body moves. The escape portion 5 is not necessarily required, and the entire thickness of the main body rotation preventing portion 3 is set to a thickness that does not contact even when the injection valve main body 102 moves in the axial direction, or the axial direction of the locking portion 118. The dimension may be increased so that the injection valve main body 102 does not contact even if it moves.

  On the other hand, the nozzle gripping portion 6 is also provided on the front side of the jig main body 2. The nozzle gripping portion 6 includes a fixed gripping portion 7 formed integrally with the jig main body 2 and the fixed gripping portion. A movable gripping part 9 that opens and closes to hold the injection nozzle 103 of the fuel injection valve 101 with the part 7 is provided. The fixed gripping portion 7 is provided at the lower part of the jig body 2 so as to protrude to the front side perpendicular to the axial direction of the fuel injection valve 101. The fixed grip portion 7 is formed to a thickness that can grip the spray nozzle 103. A concave gripping surface 8 for gripping the injection nozzle 103 of the fuel injection valve 101 is formed on the side of the fixed gripping portion 7 opposite to the jig body. The gripping surface 8 is formed in a substantially semicircular shape along a predetermined area in the axial direction of the injection nozzle 103 protruding from the tip of the fuel injection valve 101. For example, if the outer surface of the injection nozzle 103 is formed in a tapered shape that decreases in diameter toward the tip, it is formed in a tapered surface that conforms to the shape.

  The movable gripping portion 9 is provided on the side of the fixed gripping portion 7 opposite to the jig body, and is formed with a thickness equivalent to that of the fixed gripping portion 7. The movable grip 9 is held from below by a holding member 10 provided on the lower surface of the fixed grip 7. Two holding members 10 are arranged in the width direction of the movable grip portion 9. The holding member 10 is provided such that a base portion is fixed to the fixed grip portion 7 with a bolt 11 and a tip portion projects toward the lower side of the movable grip portion 9. The upper surface of the protruding portion of the holding member 10 is formed with a predetermined amount of a flat surface portion 12 on the fixed grip portion side, and an inclined surface portion whose tip end side is inclined downward toward the anti-body rotation prevention portion side from the flat surface portion 12. 13 is formed. The inclined surface portion 13 is for tilting the movable gripping portion 9 so that the upper side (the main body rotation prevention portion 3 side) of the movable gripping portion 9 is close to or away from the fixed gripping portion 7. With this inclined surface portion 13, when the movable gripping portion 9 grips the injection nozzle 103, the flat grip portion 12 supports the movable gripping portion 9 and securely holds it facing the fixed gripping portion 7, thereby opening the movable gripping portion 9. In some cases, the movable gripping portion 9 is inclined downward along the inclined surface portion 13 by its own weight, so that the upper main body rotation preventing portion 3 side is opened.

  Further, the inclined surface portion 13 is provided with a long hole 14 extending in the longitudinal direction of the holding member 10 (left and right direction in the figure). A fixing bolt 15 is inserted from below the elongated hole 14 toward the movable gripping portion 9, and the fixing bolt 15 is fixed to the mounting screw portion 16 of the movable gripping portion 9. The elongate hole 14 allows movement of the fixing bolt 15 in the longitudinal direction, but only the specified amount of the bolt hole is allowed in the width direction. Therefore, the fixing bolt 15 is fixed to the movable gripping portion 9 without being fixed to the holding member 10. Thus, the movable grip 9 can be moved within a range in which the fixing bolt 15 can move in the longitudinal direction of the elongated hole 14.

  Further, a concave gripping surface 17 for gripping the injection nozzle 103 of the fuel injection valve 101 by a gripping surface 8 formed on the fixed gripping portion 7 at the center in the width direction on the fixed gripping portion side of the movable gripping portion 9. Is formed. The gripping surface 17 is also formed in a substantially semicircular shape along a predetermined area in the axial direction of the injection nozzle 103 protruding from the tip of the fuel injection valve 101. If the outer surface of the injection nozzle 103 is formed in a tapered shape whose diameter is reduced toward the tip, the gripping surface 17 is also formed in a tapered surface along the shape.

  Since the gripping surface 17 of the movable gripping portion 9 and the gripping surface 8 of the fixed gripping portion 7 are each formed in a semicircular shape, the injection nozzle 103 can be gripped almost all around. A predetermined gap is formed between the fixed grip portion 7 and the movable grip portion 9. In this embodiment, these gripping surfaces 17 and 8 are formed as smooth surfaces. When gripping the injection nozzle 103 with these gripping surfaces 17 and 8, a compound or the like is applied as will be described later in order to increase the frictional resistance. The work is carried out so that the grip can be surely performed. In this case, the disassembled injection nozzle 103 is not damaged and can be reused. However, when disassembling the disassembled injection nozzle 103, the gripping surfaces 17 and 8 are provided with an uneven engagement surface (for example, a knurled surface). It is also possible to increase the frictional resistance with the injection nozzle 103 by forming it on the processing surface. With such gripping surfaces 17 and 8, the spray nozzle 103 can be securely gripped and a stable disassembly operation can be performed without using a compound or the like. The configuration of the gripping surfaces 8 and 17 may be selected depending on whether or not the injection nozzle 103 is reused.

  Furthermore, a guide member 18 that protrudes upward is provided on the side of the movable gripping portion 9 opposite to the fixed gripping portion. The guide member 18 includes a first projecting portion 19 projecting upward from the upper surface of the movable gripping portion 9 and a second projecting portion 20 projecting from the upper portion of the first projecting portion 19 toward the anti-fixed gripping portion side. It is formed in an L shape. This 2nd protrusion part 20 is formed in the taper surface 21 in which a lower surface inclines upward toward an edge part.

  In this embodiment, a manually operated vice 22 is used as a drive mechanism for the nozzle gripping portion 6, and the movable gripping portion 9 is pressed by a movable base 23 of the vise 22. . Then, the movable side base 23 of the vice 22 is brought into contact with the tapered surface 21 formed on the guide member 18 of the movable gripping part 9, and the movable side base 23 is tightened to the fixed side base 24 side to thereby move the movable side base 23. The upper corner portion of the base 23 moves along the tapered surface 21, and the movable gripping portion 9 in an inclined state is raised to a horizontal state and supported by the flat surface portion 12 of the holding member 10. The gripping surface 17 and the gripping surface 8 of the fixed gripping part 7 securely grip the outer surface of the spray nozzle 103.

  As described above, the tapered surface 21 with the lower surface facing the end is provided on the side of the movable gripping portion 9 opposite to the fixed gripping portion, and the movable gripping portion 9 is moved within the range of the long hole 14 of the holding member 10 as described above. By making it possible, when the movable gripping part 9 is not pressed by the movable side base 23 of the vice 22, the movable gripping part 9 is inclined to the anti-fixed gripping part side. The movable grip 9 is raised in a horizontal state and pressed toward the fixed grip 7.

  Further, an attachment portion 25 for fixing to the fixed side cap 24 of the vise 22 is provided on the back side of the jig body 2. The mounting portion 25 is provided with an upper bracket 26 and a lower bracket 27 at positions where the fixed side cap 24 can be sandwiched from above and below, and a fixing bolt 28 is provided on the upper bracket 26. In a state where the upper bracket 26 and the lower bracket 27 are positioned above and below the fixed base 24, the fixing bolt 28 provided on the upper bracket 26 is screwed downward, whereby the fixing bolt 28 and the lower bracket 27. The fixture body 2, that is, the disassembly jig 1 is fixed to the fixed side cap 24 of the vice 22 by sandwiching the fixed side cap 24 therebetween.

  Thus, in this embodiment, the disassembling jig 1 is fixed to the fixed base 24 of the vice 22, and the movable gripping part 9 is opened and closed by the movable side base 23 to open the injection nozzle 103 of the fuel injection valve 101. It is intended to be gripped or released. As a drive mechanism for the movable gripping portion 9, an actuator such as a hydraulic jack, or another configuration other than the vice 22 may be used.

  FIG. 3 is a perspective view when the fuel injection valve is set in the fuel injection valve disassembly jig shown in FIG. 1, and FIG. 4 is the fuel set in the fuel injection valve disassembly jig as shown in FIG. FIG. 5 is a perspective view when disassembling the injection valve, FIG. 5 is a drawing showing the tip portions of the fuel injection valve disassembling jig and the fuel injection valve in FIGS. 3 and 4, and (a) is a side view in FIG. (B) is a side view in FIG.

  As shown in FIGS. 3 and 5 (a), according to the disassembling jig 1, the movable gripping part 9 and the fixed gripping part 7 are movable in a state where the movable base part 23 of the vice 22 is opened and the movable gripping part 9 tilts. A compound or the like is applied to the grip surfaces 8 and 17 with the grip portion 9, and the injection nozzle 103 of the fuel injection valve 101 is inserted into the grip surfaces 8 and 17. At this time, a wrench 119 is inserted in advance in the portion of the fixing nut 109. Thereafter, the locking portion 118 formed in the injection valve main body 102 of the fuel injection valve 101 is inserted into the insertion portion 4 provided in the main body rotation preventing portion 3.

  Then, as shown in FIGS. 4 and 5 (b), the movable gripping part 9 is pressed against the fixed gripping part 7 by the movable side base 23 of the vise 22, whereby the tilted movable gripping part 9 is The horizontal surface is pressed toward the fixed gripping portion 7, and the outer surface of the ejection nozzle 103 is gripped by the gripping surface 8 of the fixed gripping portion 7 and the gripping surface 17 of the movable gripping portion 9. The grasped injection nozzle 103 is reliably grasped with a large frictional resistance by a compound or the like applied to the grasping surfaces 8 and 17. In addition, by using a compound or the like, even if there is a non-uniform gap between the outer surface of the injection nozzle 103 and the gripping surfaces 8 and 17, the gap is filled with the compound or the like to securely hold the injection nozzle 103. can do.

  In this way, the main body rotation preventing portion 3 of the disassembly jig 1 reliably prevents the injection valve main body 102 from rotating, and the fixed grip portion 7 and the gripping surfaces 8 and 17 of the movable grip portion 9 rotate the injection nozzle 103. In a state in which the movement is reliably prevented, the fixing nut 109 is loosened with a wrench 119 inserted into the fixing nut 109, so that only the fixing nut 109 is securely rotated and loosened, and the injection nozzle 103 is stably disassembled. can do. In the above embodiment, even if the injection valve main body 102 moves in the axial direction by the loose screw pitch by turning the fixing nut 109 at the time of disassembly, the injection is performed by the escape portion 5 of the main body rotation prevention portion 3. The valve main body 102 can be loosened without coming into contact with the main body rotation preventing portion 3, and a smooth operation can be performed without interrupting the operation while maintaining the state where the injection valve main body 102 is prevented from rotating.

  Further, after the fixed nut 109 is loosened and the fuel injection valve 101 is disassembled, the movable gripper 9 is moved to the anti-fixed gripper side, so that the bottom surface of the movable gripper 9 is the inclined surface of the holding member 10. 13 and the upper side is opened, so that the injection nozzle 103 and the like can be easily removed from the disassembly jig 1.

  As described above, when the fuel injection valve disassembling jig 1 is used, the injection valve main body 102 and the injection nozzle 103 of the fuel injection valve 101 can be securely held only by tightening the nozzle holding portion 6 with the vice 22 as a drive mechanism. In this state, only the fixing nut 109 can be surely loosened with the wrench 119, so that the fixing nut 109 can be stably removed and the fuel injection valve 101 can be disassembled. Therefore, if the fuel injection valve 101 is disassembled / maintained using such a fuel injection valve disassembly jig 1, the difficulty of disassembling / maintaining the fuel injection valve 101 is reduced, and the working time is greatly shortened. be able to. Moreover, since it is a simple operation, it is possible to prevent an installation operation error. In addition, it is possible to prevent damage to the parts (the injection nozzle 103 and the positioning pin 105), and to suppress new purchase costs due to part damage. That is, the fuel injection valve 101 can be reliably grasped and removed by the disassembling jig 1 only by the operation of the vice 22 serving as the drive mechanism, and only the fixing nut 109 can be stably removed. Therefore, the fuel injection valve 101 can be easily disassembled and the work difficulty is reduced. For example, in the case of the above-described marine diesel engine, the total work time for disassembling and maintaining the plurality of fuel injection valves 101 is about 3 times. It can be shortened to about 1 / min.

  As described above, if the vice 22 that is the drive mechanism of the nozzle gripping portion 6 in this embodiment is configured by an actuator such as a hydraulic jack, the injection nozzle 103 can be clamped and gripped more easily. The difficulty of the work is reduced, and the working time can be further shortened.

  In the above-described embodiment, the case where the fuel injection valve 103 is disassembled in the vertical state with the injection nozzle 103 positioned on the lower side has been described. The posture when disassembling the fuel injection valve 101 is not limited to the above embodiment.

  Furthermore, in the above-described embodiment, the example in which the fixed gripping portion 7 and the movable gripping portion 9 are formed of block-shaped members has been described. However, these can be plates that can grip a predetermined area in the axial direction of the injection nozzle 103. It may be a shape. Further, the jig main body, the main body rotation preventing portion 3 and the nozzle gripping portion 6 are formed in a “U” shape, but this shape is not limited to this embodiment.

  Further, the above-described marine diesel engine is an example, and may be a fuel injection valve 101 configured to fix the injection nozzle 103 provided at the tip of the injection valve main body 102 to the injection valve main body 102 with a fixing nut 109. Are equally applicable.

  Further, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The jig for disassembling a fuel injection valve according to the present invention can be used when disassembling a fuel injection valve having a structure in which an injection nozzle is fixed to a main body of an injection valve with a fixing nut.

1 is a perspective view showing a fuel injection valve disassembling jig according to an embodiment of the present invention. FIG. 2 is a side view of the fuel injection valve disassembling jig shown in FIG. 1. It is a perspective view when setting a fuel injection valve to the fuel injection valve disassembly jig | tool shown in FIG. It is a perspective view when disassembling the fuel injection valve set to the fuel injection valve disassembly jig as shown in FIG. FIGS. 3A and 3B are views showing the tip portions of the fuel injection valve disassembling jig and the fuel injection valve in FIGS. 3 and 4, wherein FIG. 3A is a side view in FIG. 3, and FIG. It is a longitudinal cross-sectional view which shows an example of a fuel injection valve. It is drawing at the time of decomposition | disassembly of the fuel injection valve shown in FIG. 6, (a) is a longitudinal cross-sectional view, (b) is VII-VII sectional drawing shown to (a).

Explanation of symbols

1 ... Disassembly jig
2 ... Jig body
3 ... Main body rotation prevention part
4 ... Insertion section
5 ... Escape part
6 ... Nozzle gripping part
7: Fixed gripping part
8 ... gripping surface
9: Movable gripping part
10: Holding member
11 ... Bolt
12 ... plane part
13 ... Inclined surface
14 ... Long hole
15 ... Fixing bolt
17 ... gripping surface
18 ... Guide member
19 ... 1st protrusion part
20 ... 2nd protrusion part
21 ... Taper surface
22 ... Vice
23. Movable side cap
24. Fixed side cap
25 ... Mounting part
26 ... Upper bracket
27 ... Lower bracket
28 ... Fixing bolt
101 ... Fuel injection valve
102 ... Injection valve body
103 ... injection nozzle
104 ... Intermediate plate
105 ... Locating pin
106 ... Locating pin
107: Fuel supply hole
108 ... Cooling water hole
109 ... Fixing nut 110, 111 ... Screw part
116 ... carbon
117 ... pin hole
118 ... Locking part
119 ... wrench

Claims (6)

A fuel injection valve disassembly jig in which an injection nozzle provided at the tip of an injection valve body is fixed to the injection valve body with a fixing nut,
The jig main body is provided with a main body rotation preventing portion for preventing the injection valve main body from rotating, and the jig main body is fixed at the axial position of the injection valve main body which prevents the main body rotation preventing portion from rotating. A fuel injection valve disassembling jig, comprising: a nozzle grip portion that grips the injection nozzle at a tip end side of a nut to prevent rotation of the injection nozzle and to open the injection nozzle.   The nozzle gripping portion is provided with a fixed gripping portion and a movable gripping portion facing the fixed gripping portion, and the fixed gripping portion and the movable gripping portion are provided with a gripping surface along the outer surface of the ejection nozzle, and the movable gripping portion The fuel injection valve disassembling jig according to claim 1, further comprising: a drive mechanism that opens and closes the fixed gripping portion close to or away from the fixed grip portion.   3. The fuel injection valve disassembling jig according to claim 2, wherein the movable gripping part is configured to open and close by tilting the main body rotation prevention part side when approaching or separating from the fixed gripping part.   The opening angle of the tilting movable gripping portion on the main body rotation preventing portion side is set to an angle at which the engagement between the injection valve main body and the main body rotation blocking portion can be released when the movable gripping portion is tilted. The fuel injection valve disassembling jig described.   An insertion portion that engages with the locking portion of the injection valve main body to prevent the rotation of the injection valve main body, and a clearance that allows a predetermined amount of axial movement of the injection valve main body. The fuel injection valve disassembling jig according to any one of claims 1 to 4, wherein a part is provided. The fuel injection according to any one of claims 2 to 5, wherein the gripping surface is formed as a locking surface that increases frictional resistance with an outer surface of the injection nozzle and prevents rotation of a tip of the injection nozzle. Valve disassembly jig.

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