JP5956958B2 - Ignition coil for internal combustion engine and assembly structure of ignition coil for internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine ignition coil and an assembly structure of the internal combustion engine ignition coil.

  For example, Japanese Unexamined Patent Publication No. 09-126113 (Patent Document 1) introduces an assembly structure of an ignition coil for an internal combustion engine. Such an assembly structure is intended for assembly with a plug tube provided in the internal combustion engine, and a projection of the ignition coil for the internal combustion engine is attached to the engaging portion provided in the plug tube. A fixing force is obtained (see FIG. 8 of Patent Document 1).

JP 09-126113 A

  However, according to the technique of Patent Document 1, since the fixing force around the central axis of the plug hole is entrusted to the frictional force of the nail attachment portion, there is a possibility that the fixed state cannot be properly maintained due to the vibration of the internal combustion engine. is there.

  In view of the above problems, an object of the present invention is to provide an ignition coil for an internal combustion engine that can reinforce the fixing force around the central axis of the plug hole and an assembly structure that uses the ignition coil as a component.

In order to solve the above problems, the present invention has the following assembly structure. That is, a coil main body housing the coil transformer, a projecting portion protruding substantially perpendicular to the assembly rotation shaft of the coil main body, and one of the assembly rotation shafts formed on the projection. A crest-shaped portion provided on the direction side and a claw-shaped portion formed on the projecting portion and provided on the other direction side of the assembly rotation shaft. An internal combustion engine ignition coil provided at a position displaced from the position of the region portion in a rotational direction that revolves around the assembly rotational axis, and
  A set comprising the internal combustion engine ignition coil, a fixed body to which the internal combustion engine ignition coil is assembled, and an elastic seal body sandwiched and fixed between the internal combustion engine ignition coil and the fixed body. In the attached structure,
  The fixed body includes a gap portion that forms a plane pair substantially parallel to a plane including the rotation direction, and a rotation prevention unit that is provided in the plane pair and accommodates and contacts the claw-shaped portion.
  The projecting portion is formed such that the top region portion abuts against one surface of the plane pair, and the peripheral portion of the claw-shaped portion facing the one surface forms a space between the one surface.

  Preferably, the main part of the protruding portion is a plate-like body that is substantially horizontal to a plane including the rotation direction. More preferably, the claw-shaped part is provided at one end of the plate-like body in the rotation direction, and the top region part is provided at the other end of the plate-like body in the rotation direction.

  About the top area | region site | part, it is good to give the offset surface made substantially parallel with respect to the surface containing the said rotation direction.

  About the said protruding part, it is good to provide the 1st inclined surface which goes to the said nail | claw-shaped site | part from the said top region site | part. Further, it is further preferable that the projecting portion is provided with a second inclined surface that is inclined from the other direction side to the one direction side of the assembly rotation shaft on the other direction side of the assembly rotation shaft.

  Here, it is preferable that the fixed body is formed on a head cover provided in the internal combustion engine.

  According to the assembly structure of the ignition coil for an internal combustion engine according to the present invention, the claw-like portion of the projecting portion is fitted into the rotation-preventing portion of the fixed body. Even if this force is generated, a reaction to counteract this function and the fixed state in the rotating direction is suitably maintained.

  Further, according to the ignition coil for an internal combustion engine according to the present invention, since it has a positional relationship displaced along the rotation direction, when the force sandwiching the projecting portion acts on the top region portion and the claw-shaped portion, The projecting portion is appropriately deformed. For this reason, the projecting portion relaxes the hindrance to the mounting operation due to the amount of deformation at the time of assembly, and the internal force in the direction of the assembly rotation axis after the assembly is detached in the direction of rotation of the claw-shaped part. It functions to prevent movement.

The figure which shows the ignition coil for internal combustion engines which concerns on embodiment. The figure which shows the assembly structure of the ignition coil for internal combustion engines and head cover which concerns on embodiment. State transition diagram of assembly structure according to embodiment

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external view of an ignition coil for an internal combustion engine according to the present embodiment. The internal combustion engine ignition coil 100 (hereinafter referred to as the ignition coil 100) has a coil main body 110 as a main part, and a connector part 120, a pressing part 130, a projecting part 141, and an output part 150 are integrated therewith. Is formed.

  The physical properties of these constituent parts are preferably insulating materials having an appropriate elastic coefficient. Here, the “appropriate elastic modulus” refers to an elastic modulus that does not significantly hinder the rotating operation at this time when the protruding portion 141 is attached to a fixed body described later. Therefore, the material used for this may be a thermoplastic resin or a thermosetting resin. For example, when an internal part is accommodated in the coil case and the gap portion is impregnated with resin, a thermoplastic resin such as PBT or PPS is used as the coil case, and a thermosetting resin such as an epoxy resin is used as the impregnation material. good. In addition, when the internal parts are fully molded to directly form the coil main body and the like, it is preferable to select an insulating resin suitable for this.

  The above-described internal components control the coil transformer that boosts the input voltage, the lead wiring that relays the secondary winding and the high-voltage terminal of the coil transformer, and the primary current of the coil transformer (current that flows through the primary winding). Refers to the igniter. The ignition coil for an internal combustion engine according to the present embodiment has a configuration in which all of these components are accommodated in a coil body as shown in the figure. However, the meaning of the term “ignition coil for internal combustion engine” described in the claims is not limited to this, and a so-called stick-type coil in which a coil transformer is accommodated in a plug hole. Are also included.

  The connector part 120 has a plurality of terminals 121 arranged therein, which are appropriately wired to internal components. The plurality of terminals 121 include, for example, a power supply terminal, a GND terminal, a signal terminal, and the like. And the said connector part 120 is connected to ECU (Engine Control Unit) via the harness which is not shown in figure.

  The pressing part 130 has a flat part and is provided on the bottom side of the coil main body part 110. The pressing portion 130 is assembled such that an elastic seal body (not shown) comes into contact with the flat portion. The elastic seal body will be described later.

  The output unit 150 exposes a part of the high-voltage terminal at the inside 152 of the cylindrical body. In addition, an annular protrusion 151 is integrally formed outside the output unit 150 and is fitted to a high-pressure tower (not shown). Such a high-voltage tower has a conductor embedded therein, and electrically connects the high-voltage terminal and the spark plug below the plug hole.

  A plurality of protrusions 141 are arranged on the side surface of the cylindrical intermediate body 140. The plurality of projecting portions 141 are formed with their arrangement surfaces in a state where they are offset by a predetermined distance from the flat portion of the pressing portion 130. In the present embodiment, an axis that passes through a center point that is substantially equidistant from each protruding portion 141 and is substantially perpendicular to the previous arrangement surface is referred to as an assembly rotation axis AR. The assembly rotation axis AR is a virtual axis that coincides with the central axis of the cylindrical body of the output unit 150 and substantially coincides with the central axis of the plug hole. In the assembly rotation axis AR, the direction in which the output unit 150 is provided is called a high pressure side F1, and the opposite direction is called a low pressure side F2.

  In addition, the direction of rotation / turning about the assembly rotation axis AR is referred to as a rotation direction MR. In particular, in the present embodiment, when the mounting operation is performed by rotating the ignition coil 100 in the R1 direction, the R1 is referred to as a mounting direction. Further, when the detachment operation is performed by rotating the ignition coil 100 in the R2 direction, the R2 is referred to as a detachment direction. Further, a virtual surface including the rotation direction MR, that is, a virtual surface perpendicular to the assembly rotation axis AR is referred to as a rotation surface Sr.

  As shown in FIG. 1, the protruding portion 141 is a plate-like body that is substantially parallel to the rotation surface Sr, and extends so as to be substantially perpendicular to the assembly rotation axis AR. Protruding in the extending direction. In particular, when the ignition coil 100 is fixed to the fixed body, in the present embodiment, since a plurality of the projecting portions 141 are provided, the force applied to these is dispersed. Further, since the plurality of projecting portions 141 are arranged at the same interval around the assembling rotation axis AR, the bias of the force applied thereto is eliminated.

  When the projecting portion 141 is projected onto a virtual plane in the extending direction (a direction perpendicular to the assembling rotation axis AR), the cross-sectional shape of the projecting portion 141 thereby forms a substantially trapezoidal shape, and a low pressure A top region 142 is formed in the direction F2 (one direction side of the assembly rotation axis AR) corresponding to the projecting portion 141, while the high pressure direction F1 (the other direction side of the assembly rotation axis AR) is formed. A claw-shaped portion 143 is formed at the end. Even in the nail-like portion 143, as shown in the figure, the nail-like portion 143 is provided corresponding to the protruding portion 141.

  The position of the claw-shaped part 143 is provided at a position displaced in the rotational direction MR from the reference position when the position of the previous top region part 142 is used as the reference position. That is, the claw-shaped part 143 is not disposed immediately below the top region part 142. In particular, the claw-shaped part 143 according to the present embodiment is disposed closer to the mounting direction R1 than its reference position.

  FIG. 2 shows an assembly structure including an ignition coil and a part of a fixed body provided in the internal combustion engine. Among these, the fixed body 200 is provided so that the opening hole 216 coincides with the central axis of the plug hole. Around the opening hole 216, a lower layer portion 213 and an upper layer portion 211 are provided, and a gap portion 220 is formed between a plane pair (211a and 213a in FIG. 3) that face each other. Here, most of the outline of the gap 220 is defined by a surface 211a formed on the high pressure side F1 of the upper layer portion 211 and a surface 213a formed on the low pressure side F2 of the lower layer portion 213. . And these plane pairs 211a and 213a are arranged such that each of the surfaces constituting the plane pair 211a and 213a is parallel to the rotation surface Sr, so that the gap portion 220 is parallel to the rotation surface Sr. Become.

  Further, in the present embodiment, when the concave rotation preventing portion 212 is formed in the lower layer portion 213 of the fixed body 200 and the projecting portion 141 of the ignition coil 100 is pushed into the gap portion 220, the fixed body 200 is fixed. The rotation prevention part 212 and the claw-like part 143 of the protruding part 141 are engaged with each other.

  Even in the fixed body 200, a plurality of gaps 220 are formed corresponding to the protruding portions 141 of the ignition coil. Then, at the time of mounting, the assembly rotation axis AR of the ignition coil 100 is made to coincide with the center axis of the plug hole, and the protruding portion 141 is advanced from the missing portion of the upper layer portion 213 in the high-pressure direction F1 (FIG. 2A). reference). Then, in this state, the coil main body 110 is rotated in the mounting direction R1, and the rotation preventing portion 212 of the fixed body 200 and the claw-shaped portion 143 of the protruding portion 141 are engaged (FIG. 2 ( b)).

  Actually, after attaching the ring-shaped elastic seal body 300 to the ignition coil 100, the ignition coil 100 is assembled to the fixed body 200. For this reason, the elastic seal body 300 is sandwiched between the pressing portion 130 of the ignition coil 100 and the outer edge portion 217 of the fixed body 200 and is fixed so as to prevent rainwater and the like from entering and exiting.

  According to the assembly structure of the ignition coil 100 according to the present embodiment, when the mounting of the ignition coil 100 is completed (see FIG. 3D), the claw-shaped portion 143 of the projecting portion 141 rotates the fixed body 200. Since it is fitted into the blocking portion 212, even if a force in the rotational direction accompanying the vibration is generated in the nail-shaped portion 143, a reaction that counteracts this acts and the fixed state in the rotational direction MR is suitably maintained. Is done.

  Hereinafter, the behavior of the protrusion 141 when the ignition coil 100 is attached to the fixed body 200 will be described with reference to FIG. FIG. 3A shows a scene in which the protruding portion 141 is advanced from the missing tooth portion of the upper layer portion 213 in the high-pressure direction F1 and starts rotating in the mounting direction R1. In such a scene, since the protruding portion 141 turns around the assembly rotation axis AR, the claw-shaped portion 143 of the protruding portion 141 starts to enter the gap portion 220 of the fixed body 200.

  When the turning movement of the projecting portion 141 proceeds, the end portion of the upper layer portion 211 contacts the main portion of the projecting portion 141 as shown in FIG. In this main part, the first slope 144 leading to the top region part 142 is formed, and the projecting part 141 is accommodated in the gap part 220 while the projecting part 141 is gradually displaced to the high-pressure side F1. Go. At this time, the coil main body 110 is also displaced to the high-pressure side F1 in accordance with the operation of the projecting portion 141. Therefore, the urging force gradually increases in the elastic seal body 300, and the extending direction on the assembly rotation axis AR. The power of begins to arise.

  As described above, since the first inclined surface 144 is formed in the ignition coil 10 according to the present embodiment, the compressive force applied to the elastic seal body 300 only by rotating the coil main body 110 in the mounting direction R1. Can be given gradually and evenly. For this reason, the elastic seal body 300 obtains a state suitable for waterproofness and airtightness with the structure in contact with the elastic seal body 300.

  Further, the main portion of the projecting portion 141 is a plate-like body that is substantially horizontal with respect to the rotation surface Sr as shown in the figure, and the section coefficient with the assembly rotation axis AR as the plate thickness direction is kept low. Further, the forces received from the pair of planes 211a and 213a act in opposite directions to each other, and in the projecting portion 141, the point of action of the force applied from one surface 211a and the other surface 213a are applied. The force application point is displaced in the rotational direction MR. For this reason, the projecting portion 141 is appropriately deformed when receiving a force from the pair of flat surfaces 211a and 213a, and the amount of deformation during assembly reduces the hindrance to the mounting operation, thereby realizing a smooth mounting operation.

  In particular, the protrusion 141 according to the present embodiment has a claw-shaped portion 143 provided at one end of the plate-like body in the rotation direction, and the top region portion 142 other than the rotation direction of the plate-like body. Provided at the end. That is, the nail-like portion 143 and the top region portion 142 are laid out with the mutual positional relationship being separated as much as possible in the rotation direction MR. For this reason, in the projecting portion 141, the moment force based on the reaction force of the plane pair is increased, so that the frictional force during the mounting operation can be suppressed.

  As shown in FIG. 3C, when the turning movement of the protrusion 141 further proceeds, the top region portion 142 of the protrusion 141 comes into contact with and comes into contact with the inner surface 211 a of the upper layer portion 211. At this time, the amount of displacement of the ignition coil 100 sinking in the high-pressure direction F1 reaches the maximum, and accordingly, the extension force in the axial direction AR received from the elastic seal body 300 increases.

  Further, according to the present embodiment, a discontinuous surface such as a step that is smoothly guided from the first inclined surface 144 to the top region portion 142 and hinders this is not formed. For this reason, in this Embodiment, it transfers to the state of FIG.3 (c) smoothly from the state of FIG.3 (b).

  Moreover, the top area | region site | part 142 which concerns on this Embodiment is provided with the offset surface made substantially parallel with respect to rotation surface Sr. For this reason, the projecting portion 141 applies an equal force to the top region portion 142, and smoothly performs the sliding operation in the mounting direction R1.

  When the turning operation further proceeds from here, as described above, the claw-like portion 143 of the protruding portion 141 is fitted into the rotation preventing portion 212 of the fixed body 200 (see FIG. 3D). For this reason, even if a force in the rotational direction MR accompanying the vibration of the internal combustion engine is generated in the claw-like portion 143, the formation surface of the rotation prevention portion 212 opposes the rotational force and A fixed state is suitably maintained.

  Further, depending on the dimensions of the plane pair 211a and 213a, a static bending moment can be continuously applied to the projecting portion 141, and the above-described fixed state in the rotational direction MR can be further strengthened.

  Furthermore, as shown in FIG. 3 (d), the protruding portion 141 according to the present embodiment has the nail-like portion 143 arranged on the side of the assembly rotation axis AR in the direction in which the nail-like portion 143 is arranged. A second inclined surface 147 that approaches the top region 142 about the axis AR is provided. That is, a flank is formed between the protruding portion 141 and the lower layer portion 213 of the fixed body 200. For this reason, since the nail | claw-shaped site | part 143 fits reliably in the rotation prevention part 212 of the to-be-fixed body 200, the force to the removal direction R2 applies directly to the rotation prevention part 212, and this removal direction R2 Effectively counteracts the turning movement.

  Further, in any of the above-described mounting operations, an appropriate space is formed between the inner surface 213a and the peripheral portion in the vicinity of the nail-shaped portion facing the inner surface 213a. For this reason, the sliding motion in the mounting direction R1 is smoothly performed when the ignition coil 100 is mounted, and the claw-shaped portion 143 is displaced in the direction F1 when the ignition coil 100 is intentionally attached and detached, and the rotation prevention unit 212 is moved. It is easily released from.

  In addition, it is preferable that the to-be-fixed body 200 demonstrated here is formed in the head cover which covers the cam mechanism of an internal combustion engine. The assembly structure according to the present embodiment is particularly uncomfortable with the technique of providing the plug tube as in Patent Document 1 because the shape on the fixed body side is particularly complicated. On the other hand, the assembly structure according to the present embodiment is provided in a head cover having a sufficient space around the plug hole, so that the structural configuration described above can be deployed without shortage, and the various effects described above are fully exhibited. The

  DESCRIPTION OF SYMBOLS 100 Ignition coil for internal combustion engines, 110 Coil body part, 141 Protruding part, 142 Top region part, 143 Claw-like part, 144 1st inclined surface, 200 Head cover (fixed body), 220 Clearance part, 212 Rotation prevention Part, AR assembly rotation axis, MR rotation direction, Sr rotation direction.

Claims (7)

A coil body housing the coil transformer, a projecting portion projecting substantially perpendicular to the assembly rotation shaft of the coil body portion, and one direction side of the assembly rotation shaft formed on the projection And a claw-shaped part formed on the projecting portion and provided on the other direction side of the assembly rotation shaft, and the position of the claw-shaped part is the top region part The ignition coil for an internal combustion engine provided at a position displaced from the position in the rotational direction of turning about the assembly rotational axis is used, and
A set comprising the internal combustion engine ignition coil, a fixed body to which the internal combustion engine ignition coil is assembled, and an elastic seal body sandwiched and fixed between the internal combustion engine ignition coil and the fixed body. In the attached structure,
The fixed body includes a gap portion that forms a plane pair substantially parallel to a plane including the rotation direction, and a rotation prevention unit that is provided in the plane pair and accommodates and contacts the claw-shaped portion.
The projecting portion has the top region portion in contact with one surface of the pair of planes, and the peripheral portion of the claw-shaped portion facing the one surface forms a space between the one surface. An assembly structure characterized by that. The assembling structure according to claim 1, wherein a main portion of the protruding portion is a plate-like body that is substantially horizontal to a surface including the rotation direction. The said nail | claw-shaped site | part is provided in the one end of the rotation direction among the said plate-shaped bodies, and the said top region site | part is provided in the other end of the rotation direction among the said plate-shaped bodies. Assembly structure described in 1. The assembly structure according to any one of claims 1 to 3, wherein the top region portion is provided with an offset surface that is substantially parallel to a surface including the rotation direction . . The assembly structure according to any one of claims 1 to 4, wherein the projecting portion is provided with a first inclined surface from the top region portion toward the claw-like portion. The projecting portion is provided with a second inclined surface that is inclined from the other direction side to the one direction side of the assembly rotation shaft on the other direction side of the assembly rotation shaft. The assembly structure according to any one of claims 1 to 5.   The assembly structure according to any one of claims 1 to 6, wherein the fixed body is a head cover provided in an internal combustion engine.

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