JP2006274916A - Fixing device for injector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing device for an injector, minimizing distortion of an injector caused by shifting of a clamp, so that sliding failure of a sliding part is prevented, even if pressing projection parts 5 of the clamp 3 are pressed against and fixed to a load receiving part 2 of the injector at positions shifted from an axis. <P>SOLUTION: In the clamp 3, the pressing projection parts 5 of a pair of opposite arm members 4 press and fix the injector. A plurality of pressing projection parts 5 are formed to each arm part 4 along an outer peripheral direction of the injector 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an injector fixing device that presses and fixes an injector to an engine by a clamp.

  Conventionally, as an injector fixing device for pressing and fixing an injector to an engine, for example, there are technologies presented in Patent Literature 1 and Patent Literature 2. Patent Document 1 is a method of pressing and fixing an injector to an engine using a clamp as shown in FIG. 2, and FIG. 1 shows that a pressing protrusion 3 formed on a pair of arm portions 4 of a clamp 3 is provided. A state is shown in which the injector 1 is pressed and fixed to an engine (not shown) by pressing the load receiving portion 2 of the injector 1.

  In this case, as can be seen in FIG. 2 (b), each arm portion 4 of the clamp 3 is formed with one pressing projection 5 for each arm portion 4, and the bolt hole 6 has a bolt. When pressing and fixing through, each pressing projection 5 is perpendicular to a line (Y-Y line in FIG. 3) connecting the bolt hole 6 of the clamp 3 and the center point (central axis) of the cross section of the injector 1. It adjusts so that it may be located on an axis line (XX line of FIG. 3). However, as shown in the image diagram of FIG. 3, the pressing protrusion 5 has a position b or c slightly shifted from the position a on the axis X-X (no clamp axis deviation) due to vibration during traveling or the like. A state of being pressed and fixed with (a clamp shaft deviation small or large) occurs. If the pressing projection 5 is in contact with and presses against the load receiving portion 2 of the injector 1 at the position b or c, twisting acts on the injector. This twist causes the injector to incline, and as a result, the sliding holes 7 and 9 in the injector are distorted, which causes a problem that the sliding members 8 and 10 such as the command piston cause a sliding failure.

  On the other hand, Patent Document 2 presents a pressing protrusion that is formed in a long rectangular shape. In this case, if a bolt is pressed and fixed through a bolt hole, only the end of the rectangular pressing protrusion on the bolt side is present. As a result, it comes into contact with the load receiving portion of the injector, and as a result, the same state as in the case of contact with one pressing projection is obtained, and the same problem occurs. In addition, it is conceivable to process the back surface of the pressing protrusion so that the pressing protrusion is in surface contact with the entire rectangular surface, but this is extremely costly and not realistic.

Japanese Utility Model Publication No. 6-1771 Japanese Patent Laid-Open No. 11-230007

  The present invention is intended to improve the above-described problems of the prior art, and the injector load at a position where the pressing projection of the clamp is displaced from the axis (XX line in FIG. 3) for some reason. An object of the present invention is to provide an injector fixing device capable of reducing the distortion of the injector due to the axial displacement of the clamp as much as possible and preventing the sliding failure of the sliding portion as a result even if the receiving portion is pressed and fixed.

  The injector fixing device according to claim 1 is a clamp composed of a pair of opposing arm portions and a base portion, and presses and fixes the load receiving portion of the injector with each arm portion by pressing and fixing the base portion to the cylinder head. In the clamp for fixing the injector to the engine, a plurality of pressing protrusions are formed on each arm portion.

  Since the present invention is configured as described above, the injector is stably provided with a plurality of pressing protrusions provided in each arm portion, as compared with a conventional structure in which one pressing protrusion is formed on each arm portion. The load receiving member can be pressed, and the torsional moment can be made extremely small by increasing the pressing fulcrum. As a result, even if there is a slight misalignment of the clamp, it is possible to reduce the distortion of the sliding hole of the injector and prevent sliding failure of the sliding portion.

  Preferably, the plurality of pressing protrusions are arranged along an outer peripheral direction of the injector.

  With this configuration, even if the clamp is misaligned, at least one of the plurality of pressing protrusions of each of the arm portions sandwiching the injector is connected to the axis of the injector (XX in FIG. 5). As long as it is in contact with the load receiving portion across the wire, the twist acting on the injector is extremely small. As a result, even if some axial displacement of the clamp occurs, distortion of the sliding hole of the injector can be reduced, and sliding failure of the sliding member can be prevented. In addition, this means that when the clamp is attached to the injector, the injector distortion or sliding failure can be achieved simply by adjusting the axis of the injector (XX line in FIG. 5) between the plurality of pressing protrusions. Therefore, it is possible to realize an injector fixing device that is extremely easy to handle or adjust.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a state in which the clamp 3 is mounted on the injector 1, and the pressing protrusion 5 formed on the arm portion 4 of the clamp 3 is in contact with the load receiving portion 2 of the injector 1 in a pressing state. 7 and 9 are an upper sliding hole and a lower sliding hole, respectively, and 8 and 10 are upper and lower sliding members that slide in the sliding holes, respectively. Reference numeral 11 denotes a solenoid coil for driving the sliding member, and the description and description on the drawings are omitted for other current-carrying parts, fuel supply paths, and other similar components.

  2A and 2B are plan views of the clamp 3 according to the conventional example, in which FIG. 2A is a view seen from the upper surface and FIG. Reference numeral 4 is an opposing arm portion that sandwiches the injector 1, and 5 is a pressing protrusion formed on the back surface of each arm portion 4, and presses the load receiving portion 2 of the injector 1. . One pressing protrusion 5 is formed for one arm portion 4. 6 is a bolt insertion hole provided in the base portion 3 'of the clamp 3 in which both arm portions 4 are formed to protrude from side to side. Although not shown, by inserting the bolt and fixing it to the cylinder head, The pressing protrusion 5 of the clamp 3 is configured to contact and press against the load receiving portion 2 of the injector 1.

  FIG. 3 is a plan view schematically showing the state of the axis deviation of the clamp related to the conventional example. Each of a, b, and c indicates the pressing position of the pressing protrusion 5. The clamp body 3 and the arm part 4 are not shown.

  In this case, as can be seen in FIG. 2 (b), each arm portion 4 of the clamp 3 is formed with one pressing projection 5 for each arm portion 4, and the bolt hole 6 has a bolt. When pressing and fixing through, each pressing projection 5 has an axis perpendicular to the line (Y-Y line in FIG. 3) connecting the bolt hole 6 of the clamp 3 and the center point (central axis) of the cross section of the injector. It adjusts so that it may be located on (XX line of FIG. 3). However, as shown in the image diagram of FIG. 3, the pressing protrusion 5 is moved slightly to the left or right from the position “a” (clamp axis misalignment) on the axis XX due to vibration or the like during traveling. A state in which the clamp shaft is pressed and fixed with a small or large clamp shaft deviation occurs. When the pressing protrusion 5 is in such a state of b or c, the sliding holes 7 and 9 in the injector are distorted, which causes a sliding failure of the sliding members 8 and 10 such as the command piston. As described above, this occurs.

  4A and 4B are plan views of the clamp according to the present invention, in which FIG. 4A is a view seen from the top surface, and FIG. 4B is a view seen from the back surface. Since a plurality of (in this case, two each) pressing protrusions 5 are formed on each arm portion 4, the description is omitted because it is the same as the conventional example of FIG. 2.

  FIG. 5 is a plan view schematically showing the state of the axis deviation of the clamp according to the present invention. Each of a, b, and c indicates the pressing position of the pressing protrusion 5. The clamp body 3 and the arm part 4 are not shown.

  In FIG. 5A, the axis line XX is located at a position just between the positions a and a of the two pressing projections 5 on the left and right. That is, since the center of action of each load of the left and right pressing protrusions 5 is on the axis XX, this is a state in which there is no axial deviation of the clamp and is most stable. It can be said that it is in a state.

  In FIG. 5B, it is understood that the action center points of the respective loads b and b of the left and right pressing protrusions 5 are slightly shifted clockwise from the axis XX. . However, the axis XX is located between the positions b and b of the two right and left pressing protrusions 5, and in this case, the torsional moment is extremely large due to the increase of the fulcrum (pressing point). It is getting smaller. For this reason, unlike the case of FIG. 3b in which there is only one fulcrum (pressing point) and “clamp shaft misalignment is small”, in this case, the twist acting on the injector becomes very small, and the sliding hole of the injector 7 and 9 can be reduced, and as a result, sliding failure of the sliding members 8 and 10 can be prevented.

  FIG. 5 (c) shows that the load action center points of the positions c and c of the two right and left pressing projections 5 are greatly deviated counterclockwise from the axis XX, and the axis X It is understood that -X is not located between the positions c and c of the two right and left pressing protrusions 5. In this case, in spite of the effect that the torsional moment due to the increase of the fulcrum (pressing point) is reduced, the torsion acts on the injector, and the sliding holes 7 and 9 of the injector are distorted. This causes a sliding failure of the sliding members 8 and 10.

  In summary, the present invention is a clamp 3 comprising a pair of opposing arm portions 4 and a base portion 3 ′, and the weight receiving portion 2 of the injector 1 is fixed by pressing the base portion 3 ′ to the cylinder head. In the clamp 3 that presses each arm portion 4 to fix the injector to the engine, each arm portion 4 is formed with a plurality of pressing protrusions 5, preferably a plurality of pressing portions. The protrusions 5 are arranged along the outer peripheral direction of the injector 1.

Since the present invention is configured as described above, the plurality of pressing protrusions 5 provided on each arm member is more stable than the conventional one in which one pressing protrusion 5 is formed on each arm part 4. Thus, the load receiving member 2 can be pressed and the torsional moment can be made extremely small by increasing the pressing fulcrum. As a result, even if there is a slight misalignment of the clamp 3, at least one of the plurality of pressing projections 5 of each arm portion 4 constituting a pair with the injector 1 sandwiched therebetween is connected to the axis of the injector 1 (X in FIG. 5). As long as it is in contact with the load receiving portion 2 across (−X-ray), the torsion acting on the injector 1 is extremely small. Therefore, even if some clamp misalignment occurs as compared with the conventional clamp, the distortion of the sliding holes 7 and 9 of the injector can be reduced and the sliding failure of the sliding portions 8 and 10 can be prevented. It has the effect of being able to do it.
Further, this means that when the clamp 3 is attached to the injector 1, it is only necessary to adjust the axis (X-X line in FIG. 5) of the injector 1 between the plurality of pressing protrusions 5. It is possible to prevent distortion or sliding failure and to realize an injector fixing device that is extremely easy to handle or adjust.

It is a side view in the state where a clamp was attached to an injector. It is the top view of the clamp regarding a prior art example, (a) is the figure seen from the upper surface, (b) is the figure seen from the back surface. It is the top view which modeled the axial shift of the clamp regarding a prior art example. It is the top view of the clamp regarding this invention, (a) is the figure seen from the upper surface, (b) is the figure seen from the back surface. It is the top view which modeled the axial shift of the clamp regarding this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injector 2 Load receiving part 3 Clamp 3 'Clamp base 4 Arm member 5 Pressing protrusion 6 Bolt insertion hole 7 Sliding hole 8 Sliding member 9 Sliding hole 10 Sliding member 11 Solenoid coil

Claims (2)

  A clamp (3) comprising a pair of opposing arm portions (4) and a base portion (3 ′), wherein the base portion (3 ′) is pressed and fixed to the cylinder head, whereby the load receiving portion of the injector (1) In the clamp (3) for pressing the (2) with the arm portions (4) to fix the injector (1) to the engine, a plurality of pressing protrusions (5) are formed on the arm portions (4), respectively. An injector fixing device characterized by the above.   The injector fixing device according to claim 1, wherein the plurality of pressing protrusions (5) are arranged along an outer peripheral direction of the injector (1).

Images