JP7275998B2 - cylinder head cover - Google Patents

Description

The present invention relates to a cylinder head cover for an internal combustion engine.

Patent Literature 1 discloses a cylinder head cover to which an ignition coil of an internal combustion engine is fastened. In an internal combustion engine having such a cylinder head cover, vibrations of the internal combustion engine may cause vibration of the cylinder head cover and deformation of the cylinder head cover. The cylinder head cover disclosed in Patent Document 1 includes reinforcing ribs for improving the rigidity of the cylinder head cover. The reinforcing ribs are arranged in a V shape so as to protrude from the front surface of the cylinder head cover.

JP 2012-82706 A

In the case of the configuration in which the ignition coils are attached to the cylinder head cover as disclosed in Patent Document 1, each ignition coil is in a cantilevered state with one portion fastened and fixed to the cylinder head cover. When the ignition coil is in a cantilevered state in this way, the ignition coil is likely to vibrate. Such vibration of the ignition coil is one of the factors that cause the cylinder head cover to vibrate. As for the cylinder head cover, it is required to reduce vibration of the cylinder head cover in consideration of the manner in which the ignition coil is fixed.

A cylinder head cover for solving the above problems is applied to an internal combustion engine provided with a plurality of ignition coils, and includes insertion holes into which the ignition coils are inserted and fastening holes into which fasteners for fastening the ignition coils are inserted. , a cylinder head cover provided for each of the ignition coils and covering a cylinder head of an internal combustion engine with a cover body, the cover body comprising a bulging portion for mounting each of the ignition coils; The bulging portion has the same number of installation portions as the insertion holes, and rampart portions surrounding the installation portions. Then, the insertion hole is opened in the top end surface of each installation part, and the ramp part bulges higher than the installation part. is the top end face of the ramp part, the fastening hole is opened in the top end face of the ramp part, and the direction in which the plurality of insertion holes are arranged is the first direction, and the installation part A main wall portion extending in the first direction at one end of the bulging portion in the second direction, with a direction orthogonal to the first direction among directions along the top end face as a second direction. and a plurality of side wall portions extending toward the other end side of the bulging portion in the second direction with the main wall portion serving as a base end, and the insertion hole and the With respect to the side wall portion and the main wall portion located on one side in the first direction, the point located on the most one side of the edge of the insertion hole on the same plane as the top end surface of the installation portion is taken as a reference point. , the main wall portion is disposed on one end side of the bulging portion in the second direction with respect to the reference point, and the other end of the bulging portion in the second direction with respect to the reference point The gist is that the side wall portion is arranged on the side.

In the above configuration, the bulging portion to which the ignition coil is attached has a ramp portion that bulges further than the installation portion in which the insertion hole for the ignition coil opens. Further, in the bulging portion, the main wall portion of the rampart portion extending in the first direction and the side wall portion having the main wall portion as a base end surround the installation portion, and the tip of the side wall portion is the insertion hole. turning to the side. Rigidity of the bulging portion can be ensured by such a rampart portion. Accordingly, when the cylinder head cover is applied to an internal combustion engine, vibration of each ignition coil attached to the bulging portion of the cylinder head cover can be reduced. As a result, vibration of the cylinder head cover due to vibration of each ignition coil can be reduced, and deformation of the bulging portion can be reduced.

1 is a schematic diagram showing an internal combustion engine to which one embodiment of a cylinder head cover is applied; FIG. The front view which shows the ignition coil attached to the same cylinder head cover and the same cylinder head cover. The front view which shows the same cylinder head cover. The perspective view which shows the same cylinder head cover.

An embodiment of the cylinder head cover will be described below with reference to FIGS. 1 to 4. FIG.
FIG. 1 shows an internal combustion engine 90 to which the cylinder head cover 10 is applied. The internal combustion engine 90 includes a cylinder block 93 in which cylinders 94 are formed, a cylinder head 91 attached to the cylinder block 93 , and a cylinder head cover 10 attached to the cylinder head 91 . The cylinder head cover 10 has a dome shape with a bottom surface on the side attached to the cylinder head 91 and covers the cylinder head 91 . Note that the internal combustion engine 90 is an in-line three-cylinder internal combustion engine. The cylinder 94 is one of three cylinders formed side by side in the cylinder block 93 .

The internal combustion engine 90 has a spark plug 89 with an electrode exposed to the cylinder 94 . The internal combustion engine 90 has an ignition coil 81 that generates a high voltage for discharging a spark plug 89 . A spark plug 89 and an ignition coil 81 are provided for each cylinder.

The ignition coil 81 is inserted into a plug hole 92 formed in the cylinder head 91 and fastened to the cylinder head cover 10 . The ignition coil 81 has a bottom portion 82 that is inserted into the plug hole 92 . The bottom portion 82 extends cylindrically and has one end connected to a spark plug 89 . The ignition coil 81 has a top portion 83 connected to the other end of the bottom portion 82 . The top portion 83 is exposed on the opposite side of the cylinder head cover 10 to the cylinder head 91 . The top portion 83 has a fastening portion 85 that is a fastening portion with the cylinder head cover 10 . The top portion 83 has a connector 84 to which wiring is connected.

FIG. 2 shows cylinder head cover 10 and ignition coil 81 . FIG. 2 shows an arrow indicating the first direction in which the ignition coils 81 are arranged. That is, the first direction is the direction in which the cylinders 94 are arranged in the internal combustion engine 90 and the axial direction of the crankshaft of the internal combustion engine 90 . Also, in FIG. 2, an arrow indicating a second direction, which is a direction orthogonal to the first direction, is displayed.

The ignition coil 81 is attached to the cylinder head cover 10 . The ignition coil 81 is fastened and fixed to the cylinder head cover 10 by a fastener 86 inserted into the fastening portion 85 . As shown in FIG. 2, the ignition coil 81 is attached at an angle in which a straight line connecting the fastening portion 85 and the connector 84 is inclined with respect to the first direction. Each ignition coil 81 is inclined at a prescribed angle with respect to the first direction.

The cylinder head cover 10 will be described with reference to FIGS. 3 and 4. FIG. The cylinder head cover 10 is molded from a resin material. In addition, in FIG. 3, arrows indicating the first direction and the second direction are displayed in the same manner as in FIG.

As shown in FIG. 3 , the cylinder head cover 10 has a cover body 11 that covers the cylinder head 91 . Of the cover body 11 , the surface facing the cylinder head 91 when the cylinder head cover 10 is attached to the cylinder head 91 is the back surface, and the surface opposite to the back surface is the front surface 12 .

The cylinder head cover 10 has a bulging portion 20 bulging from the front surface 12 of the cover body 11 . That is, the bulging portion 20 bulges in a direction away from the cylinder head 91 when the cylinder head cover 10 is attached to the cylinder head 91 . The bulging portion 20 is located near the center of the cylinder head cover 10 .

The back surface of the cover body 11 facing the cylinder head 91 when the cylinder head cover 10 is attached to the cylinder head 91 is provided with reinforcing ribs. Ribs are also provided on the back surface of the bulging portion 20 . The thickness of the cylinder head cover 10 excluding ribs is uniform throughout the cylinder head cover 10 . A bulging portion 20 bulging out from the cover body 11 is hollow.

The cylinder head cover 10 has a separator 13 . Separator 13 is positioned on one side in the second direction with respect to bulging portion 20 . The cylinder head cover 10 has a first extending portion 14A and a second extending portion 14B connected to the bulging portion 20 on the opposite side of the bulging portion 20 from the separator 13 . Separator 13 , first extension 14</b>A and second extension 14</b>B are provided on front surface 12 of cover body 11 .

The bulging portion 20 is formed with an insertion hole into which the bottom portion 82 of the ignition coil 81 is inserted. The bulging portion 20 includes, as insertion holes, a first insertion hole 31, a second insertion hole 32, and a third insertion hole 33 arranged in order in the first direction.

The bulging portion 20 has a first installation portion 21 with a first insertion hole 31 open. The bulging portion 20 has a second installation portion 22 with a second insertion hole 32 open. The second installation portion 22 is positioned apart from the first installation portion 21 in the first direction. The bulging portion 20 has a third installation portion 23 with a third insertion hole 33 open. The third installation portion 23 is positioned apart from the second installation portion 22 in the first direction. The first installation portion 21, the second installation portion 22, and the third installation portion 23 are arranged in order in the first direction.

The first insertion hole 31 opens in the first top end surface 21A, which is the surface with the highest bulging height in the first installation portion 21, as shown in FIG. The second insertion hole 32 opens to the second top end surface 22A, which is the surface with the highest bulging height in the second installation portion 22. As shown in FIG. The third insertion hole 33 opens to the third top end surface 23A, which is the surface with the highest bulging height in the third installation portion 23 . The first to third top end faces 21A to 23A are coplanar surfaces having the same swelling height. Among the directions along the first to third top end surfaces 21A to 23A, the direction orthogonal to the first direction corresponds to the second direction.

A first fixing bolt hole 37 is opened in the second installation portion 22 . A second fixing bolt hole 38 is opened in the third installation portion 23 . The first fixing bolt hole 37 and the second fixing bolt hole 38 are holes into which bolts for rigidly connecting the cylinder head cover 10 are inserted. For example, the cylinder head cover 10 is attached to the cylinder head 91 by bolts inserted into the first fixing bolt holes 37 and the second fixing bolt holes 38 .

As shown in FIGS. 3 and 4, the bulging portion 20 includes a rampart portion 24 surrounding the first to third installation portions 21-23. As shown in FIG. 4, the rampart portion 24 has a bulging height higher than the first to third top end faces 21A to 23A of the first to third installation portions 21 to 23 .

The rampart portion 24 includes a main wall portion 25 extending in the first direction and a plurality of side wall portions extending from the main wall portion 25 as base ends. The main wall portion 25 is positioned at a first end 20A of the bulging portion 20 on the separator 13 side. That is, the main wall portion 25 extends in the first direction at one end of the bulging portion 20 in the second direction. The main wall portion 25 extends from one end to the other end of the bulging portion 20 in the first direction. The main wall portion 25 has a prescribed length in the second direction.

The rampart portion 24 includes first to fourth side wall portions 26 to 29 as a plurality of side wall portions. The first to fourth side wall portions 26 to 29 extend from the main wall portion 25 to the other end side of the bulging portion 20 in the second direction. The protruding height of the base end side of the first to fourth side wall portions 26 to 29 is equal to the protruding height of the main wall portion 25 . The other end of the bulging portion 20 is the second end 20B that is the end of the bulging portion 20 opposite to the separator 13 .

The first side wall portion 26 is positioned at one end of the bulging portion 20 in the first direction. That is, the first side wall portion 26 is located closer to the end side of the bulging portion 20 than the first installation portion 21 in the first direction. The second side wall portion 27 is positioned between the first installation portion 21 and the second installation portion 22 in the first direction. The third side wall portion 28 is positioned between the second installation portion 22 and the third installation portion 23 in the first direction. The fourth side wall portion 29 is positioned closer to the end of the bulging portion 20 than the third installation portion 23 in the first direction. That is, the first to fourth side wall portions 26 to 29 are arranged in order in the first direction.

Since the rampart portion 24 has such a shape, in the bulging portion 20, the first installation portion 21 is sandwiched between the first side wall portion 26 and the second side wall portion 27 in the first direction. The second installation portion 22 is sandwiched between the second side wall portion 27 and the third side wall portion 28 in the first direction. The third installation portion 23 is sandwiched between the third side wall portion 28 and the fourth side wall portion 29 in the first direction.

A fastening hole into which a fastener 86 for fastening the fastening portion 85 of the ignition coil 81 is inserted is opened in the rampart portion 24 . As shown in FIGS. 3 and 4, the rampart portion 24 has, as fastening holes, a first fastening hole 34 corresponding to the ignition coil 81 inserted into the first insertion hole 31 and a second fastening hole 32. A second fastening hole 35 corresponding to the ignition coil 81 to be inserted and a third fastening hole 36 corresponding to the ignition coil 81 to be inserted into the third insertion hole 33 are formed. The diameters of the first to third fastening holes 34-36 are smaller than the diameters of the first to third insertion holes 31-33. As shown in FIG. 4, the first to third fastening holes 34 to 36 open to the top end surface 24A, which is the surface of the rampart 24 with the highest bulging height.

The positional relationship between the insertion hole and the fastening hole corresponding to the insertion hole will be described using the first insertion hole 31 and the first fastening hole 34 as an example. In FIG. 3 , the center of the opening of the first insertion hole 31 on the same plane as the first top end surface 21A of the first installation portion 21 is indicated as the center 31C of the first insertion hole 31 . Further, the center of the opening of the first fastening hole 34 on the same plane as the top end face 24A of the rampart 24 is indicated as the center 34C of the first fastening hole 34. As shown in FIG. As shown in FIG. 3 , the center 34</b>C of the first fastening hole 34 is positioned closer to the first end 20</b>A of the bulging portion 20 than the center 31</b>C of the first insertion hole 31 . Further, the first fastening hole 34 is provided so that the center 34C is positioned closer to the second insertion hole 32 side, which is one side in the first direction, than the center 31C of the first insertion hole 31 . The second insertion hole 32 and the second fastening hole 35 and the third insertion hole 33 and the third fastening hole 36 also have the same positional relationship as the first insertion hole 31 and the first fastening hole 34 .

The bulging portion 20 will be described in more detail with reference to FIG. FIG. 3 shows an arrow indicating the third direction, which is the direction in which the straight line connecting the center 31C of the first insertion hole 31 and the center 34C of the first fastening hole 34 extends. The angle formed by the third direction with respect to the first direction is a prescribed angle at which each ignition coil 81 is inclined with respect to the first direction. Also, in FIG. 3, an arrow indicating a fourth direction, which is a direction orthogonal to the third direction, is displayed.

In FIG. 3, a straight line passing through the center 34C of the first fastening hole 34 and extending in the second direction is indicated by a dashed line as a first imaginary line L1. A straight line extending in the third direction through the base end 27A, which is the end of the second side wall portion 27 on the main wall portion 25 side, is indicated by a two-dot chain line as a second virtual line L2.

The outer side of the first insertion hole 31 in the fourth direction is sandwiched by the first side wall portion 26 and the second side wall portion 27 which are a pair of side wall portions. Similarly, the second insertion hole 32 has its outer side in the fourth direction sandwiched by a pair of side walls, that is, a second side wall portion 27 and a third side wall portion 28 . The outside of the third insertion hole 33 in the fourth direction is sandwiched by a pair of side walls, namely a third side wall portion 28 and a fourth side wall portion 29 .

The first side wall portion 26 extends from the main wall portion 25 to the second end 20B side. The tip of the first side wall portion 26 is located between the first end 20A and the second end 20B of the bulging portion 20 .

The second side wall portion 27 is a side wall portion located on the second insertion hole 32 side with respect to the first insertion hole 31 corresponding to the first fastening hole 34 . A distal end 27B, which is the end of the second side wall portion 27 opposite to the proximal end 27A, is positioned closer to the center 31C of the first insertion hole 31 than the first imaginary line L1 in the first direction. That is, the second side wall portion 27 extends obliquely with respect to the second direction from the proximal end 27A toward the distal end 27B. More specifically, the second side wall portion 27, which has the main wall portion 25 as the base end 27A and the tip 27B positioned at the second end 20B, extends so that the tip 27B faces the second imaginary line L2. A tip 27B of the second side wall portion 27 wraps around to the first insertion hole 31 side. Also, the width of the tip 27B of the second side wall portion 27 is smaller than the width of the base 27A in the first direction. The second side wall portion 27 has a smaller width toward the tip 27B.

In FIG. 3, the first hole edge indication line L31 is displayed as a virtual line. The first hole edge indication line L31 passes through a point of the edge of the first insertion hole 31 on the same plane as the first top end surface 21A of the first installation portion 21, which is located on the first side in the first direction. It is a straight line extending in two directions. It can also be said that the first hole edge indication line L31 is a tangent to the opening of the first insertion hole 31 . As shown in FIG. 3, the main wall portion 25 is located on the first end 20A side on the first hole edge indication line L31. Furthermore, since the tip 27B of the second side wall portion 27 wraps around to the first insertion hole 31 side, the second side wall portion 27 is positioned on the second end 20B side on the first hole edge indication line L31. there is That is, with respect to the first insertion hole 31 and the second side wall portion 27 and the main wall portion 25 positioned on one side in the first direction with respect to the first insertion hole 31, the first top end surface 21A of the first installation portion 21 and the Assuming that a point located on one side in the first direction of the edge of the first insertion hole 31 on the same plane is a reference point, the first end 20A side of the bulging portion 20 in the second direction with respect to the reference point. , the main wall portion 25 is arranged, and the second side wall portion 27 is arranged on the second end 20B side of the bulging portion 20 in the second direction with respect to the reference point.

As with the second side wall portion 27 , the third side wall portion 28 extends so that the tip thereof wraps around to the second insertion hole 32 side. As with the second side wall portion 27 , the fourth side wall portion 29 also extends so that the tip thereof wraps around to the third insertion hole 33 side.

In FIG. 3, like the first hole edge indication line L31 for the first insertion hole 31, a second hole edge indication line L32 for the second insertion hole 32 and a third insertion hole are shown as imaginary lines. 33, the third hole edge display line L33 is displayed. As shown in FIG. 3, the third side wall portion 28 and the main wall portion 25 are positioned on the second hole edge indicating line L32. The fourth side wall portion 29 and the main wall portion 25 are positioned on the third hole edge indicating line L33. That is, with respect to the second insertion hole 32 and the third side wall portion 28 and the main wall portion 25 located on one side in the first direction with respect to the second insertion hole 32, the second top end face 22A of the second installation portion 22 and the Assuming that a point located on one side in the first direction of the edge of the second insertion hole 32 on the same plane is a reference point, the first end 20A side of the bulging portion 20 in the second direction with respect to the reference point. , the main wall portion 25 is arranged, and the third side wall portion 28 is arranged on the second end 20B side of the bulging portion 20 in the second direction with respect to the reference point. The third insertion hole 33 and the fourth side wall portion 29 and the main wall portion 25 located on one side of the third insertion hole 33 in the first direction are flush with the third top end face 23A of the third installation portion 23. Assuming that the edge of the third insertion hole 33 on the top, which is located on one side in the first direction, is the reference point, on the first end 20A side of the bulging portion 20 in the second direction with respect to the reference point, A main wall portion 25 is arranged, and a fourth side wall portion 29 is arranged on the second end 20B side of the bulging portion 20 in the second direction with respect to the reference point.

In the bulging portion 20, a first curved portion 21B that is curved and recessed from the second end 20B side to the first end 20A side in FIG. Similarly, the second and third curved portions 22B and 23B curved and recessed from the second end 20B side to the first end 20A side serve as boundaries between the second and third installation portions 22 and 23 and the rampart portion 24. there is

The operation of this embodiment will be described.
In the cylinder head cover 10, the bulging portion 20 to which the ignition coil 81 is attached is larger than the first to third installation portions 21 to 23 in which the first to third insertion holes 31 to 33 for inserting the ignition coil 81 are open. Further, a bulging rampart 24 is provided. In the bulging portion 20, the main wall portion 25 extending in the first direction of the rampart portion 24 and the first to fourth side wall portions 26 to 29 having the main wall portion 25 as a base end form the first to third installation portions 21. ~23 are surrounded. Furthermore, the tips of the second to fourth side wall portions 27 to 29 wrap around toward the insertion hole. Rigidity of the bulging portion 20 is secured by such a rampart portion 24 .

Here, for the ignition coil 81 attached using the insertion hole of the installation portion and the fastening hole of the rampart, it is possible to estimate the vibration direction of the ignition coil 81 by specifying the positions of the insertion hole and the fastening hole. . For example, the ignition coil 81 attached to the cylinder head cover 10 has a third direction in which a straight line connecting the center 31C of the first insertion hole 31 and the center 34C of the first fastening hole 34 extends, and a direction perpendicular to the third direction. It is easy to vibrate in the fourth direction. In the cylinder head cover 10, considering the vibration direction of the ignition coil 81, the second to fourth side wall portions 27 to 29 extend obliquely. In the fourth direction, the outer sides of the first to third insertion holes 31 to 33 are sandwiched between the pair of side wall portions. That is, the rigidity of the cylinder head cover 10 is secured in consideration of the vibration direction of the ignition coil 81 .

Effects of the present embodiment will be described.
(1) Rigidity of the bulging portion 20 can be ensured by the rampart portion 24 . As a result, the vibration of the ignition coil 81 can be reduced, so that the vibration of the bulging portion 20 can be reduced, and the deformation of the bulging portion 20 can be reduced.

(2) The rigidity of the cylinder head cover 10 is improved in consideration of the vibration direction of the ignition coil 81 . As a result, vibration of the ignition coil 81 can be reduced.
(3) Since the rigidity of the bulging portion 20 is improved by the rampart 24, the rigidity of the bulging portion 20 can be ensured even if the number of ribs provided on the back surface of the bulging portion 20 is reduced.

(4) Vibration of the entire cylinder head cover 10 caused by vibration of the ignition coil 81 is reduced by ensuring the rigidity of the bulging portion 20 that bulges from the cover body 11 and is the portion to which the ignition coil 81 is attached. can be done.

(5) Since the vibration of the entire cylinder head cover 10 can be reduced, even if the number of connection points between the cylinder head cover 10 and the rigid body is reduced, the vibration of the cylinder head cover 10 caused by the vibration of the internal combustion engine 90 can be suppressed. It can reduce deformation.

This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.
- In the above embodiment, the tip 27B of the second side wall portion 27 is arranged at the second end 20B. The tip of the tip 27B of the second side wall portion 27 may be positioned between the first end 20A and the second end 20B of the bulging portion 20 . That is, the length of the second side wall portion 27 can be changed. Similarly, the lengths of the third and fourth side walls 28, 29 can also be changed.

- In the above-described embodiment, the tip of the first side wall portion 26 is located between the first end 20A and the second end 20B of the bulging portion 20, but the first side wall portion 26 may extend to the second end 20B of the

- In the cylinder head cover 10 of the above embodiment, the width of the second side wall portion 27 in the first direction can be changed. For example, in the above embodiment, the second side wall portion 27 has a smaller width toward the tip 27B, but the second side wall portion 27 may have a constant width from the base end 27A to the tip 27B. Similarly, the width of the third and fourth side walls 28, 29 can also be changed. The width of the first side wall portion 26 may also be changed.

- In the above embodiment, the tip 27B of the second side wall portion 27 extends toward the second imaginary line L2. The angle of the second side wall portion 27 can be changed. For example, the second side wall portion 27 may be provided such that a virtual line connecting the proximal end 27A to the distal end 27B coincides with the second virtual line L2. Similarly, the angles of the third and fourth side walls 28, 29 can also be changed.

- In the cylinder head cover 10 of the above-described embodiment, the bulging height of the second side wall portion 27 can be changed. For example, the bulging height of the distal end 27B of the second side wall portion 27 may be lower than the bulging height of the proximal end 27A of the second side wall portion 27 . Even in this case, it is preferable that the bulging height of the tip 27B of the second side wall portion 27 is higher than the bulging height of the second installation portion 22 . Similarly, the bulging height of the third and fourth side walls 28, 29 can also be changed. The bulging height of the first side wall portion 26 may also be changed.

In the cylinder head cover 10 of the above embodiment, if the bulging height of the rampart 24 surrounding the first to third installation parts 21 to 23 is higher than the bulging height of each installation part, The bulging height can be changed as appropriate.

- In the cylinder head cover 10 of the above-described embodiment, the center 34C of the first fastening hole 34 is located closer to the first end 20A of the bulging portion 20 than the center 31C of the first insertion hole 31 is. Further, the center 34C of the first fastening hole 34 is provided so as to be located on the second insertion hole 32 side, which is one side in the first direction, of the center 31C of the first insertion hole 31 . As long as the insertion hole and the fastening hole corresponding to the insertion hole have the above positional relationship, the position and diameter of each insertion hole can be changed. Also, the position and diameter of each fastening hole can be changed as long as the above positional relationship is maintained.

The mounting angle of the ignition coil 81 is determined by the positions of the insertion hole and the fastening hole. That is, the prescribed angle at which the ignition coil 81 is inclined with respect to the first direction can also be changed.
- In the cylinder head cover 10 of the above-described embodiment, a pedestal portion with which the ignition coil 81 abuts may be provided on the periphery of the openings of the first to third insertion holes 31 to 33 . As the pedestal, for example, a shape in which the top end surface of the installation portion protrudes in an annular shape can be adopted. The pedestal portion is not limited to a circular ring shape, and may be a shape in which a part of the circular ring is missing, such as a C-shape. Similarly, pedestals may be provided around the openings of the first to third fastening holes 34 to 36 .

- The cylinder head cover 10 shown in the above embodiment is an example of a cylinder head cover provided with the bulging portion 20 for attaching the ignition coil 81 . The shape of the cylinder head cover can be changed as appropriate as long as it has the bulging portion 20 .

- The cylinder head cover 10 of the above-described embodiment is a cylinder head cover applied to an in-line three-cylinder internal combustion engine. By adopting the structure of the bulging portion 20 having the rampart portion 24 as a mounting portion for mounting the ignition coil 81, the application is possible without being limited to an in-line three-cylinder internal combustion engine.

DESCRIPTION OF SYMBOLS 10... Cylinder head cover, 11... Cover main body, 20... Swelling part, 21... 1st installation part, 22... 2nd installation part, 23... 3rd installation part, 24... Rampage part, 25... Main wall part, 26 First side wall portion 27 Second side wall portion 27A Base end 27B Tip 28 Third side wall portion 29 Fourth side wall portion 31 First insertion hole 32 Second insertion hole 33... Third insertion hole, 34... First fastening hole, 35... Second fastening hole, 36... Third fastening hole, 81... Ignition coil, 84... Connector, 85... Fastening part, 86... Fastener, 89... Ignition Plug 90... Internal combustion engine 91... Cylinder head 92... Plug hole 93... Cylinder block 94... Cylinder.

Claims (1)

applied to internal combustion engines with multiple ignition coils,
An insertion hole into which the ignition coil is inserted and a fastening hole into which a fastener for fastening the ignition coil is inserted are provided for each ignition coil, and a cover body covers the cylinder head of the internal combustion engine. A cylinder head cover,
A bulging portion that bulges from the cover body and attaches each of the ignition coils,
The bulging portion has the same number of installation portions as the insertion holes, and a rampart portion surrounding the installation portions,
Assuming that the top surface of the installation portion is the surface having the highest bulging height in the installation portion, the insertion holes are opened in the top end surface of each installation portion,
The rampart section protrudes higher than the installation section. The fastening hole is open on the surface,
A direction in which the plurality of insertion holes are arranged is defined as a first direction, and a direction perpendicular to the first direction among directions along the top end surface of the installation portion is defined as a second direction,
The rampart portion includes a main wall portion extending in the first direction at one end of the bulging portion in the second direction, and the bulging portion in the second direction with the main wall portion serving as a base end. a plurality of side walls extending endwardly;
With respect to the insertion hole and the side wall portion and the main wall portion located on one side in the first direction with respect to the insertion hole, the edge of the insertion hole on the same plane as the top end surface of the installation portion is the most A point located on one side is used as a reference point, and when imagining a virtual straight line passing through the reference point and extending in the second direction, the main wall portion is located on one end side of the bulging portion on the virtual straight line. and the side wall portion is arranged on the other end side of the bulging portion on the imaginary straight line .

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