JP4968228B2 - Engine superstructure - Google Patents

Description

  The present invention relates to an upper structure of an engine and mainly relates to an arrangement structure of an ignition device.

As an ignition coil used for generating a spark from an engine ignition plug, a stick type ignition coil unit that can be inserted into a plug hole in a cylinder head from above an engine head cover is widely adopted. The ignition coil unit has a head portion exposed on the head cover, and a connector for connecting electrical wiring is provided on the head portion. For this reason, the wiring and the ignition coil unit can be replaced without removing the head cover. On the other hand, a multi-ignition engine provided with a plurality of spark plugs per cylinder has been proposed as one of engine combustion control techniques (for example, Patent Document 1).
JP 2001-234842 A

  In a multi-ignition engine, since an ignition coil unit is required for each spark plug, the number of ignition coil units is doubled. For this reason, the exclusive area of the head of the ignition coil unit is large on the head cover, and it becomes difficult to secure a space for disposing other configurations, for example, an oil filler portion, and the design freedom of the head cover is reduced.

  An object of the present invention is to improve the design freedom of a head cover in an engine provided with a plurality of spark plugs per cylinder.

In order to solve the above problems, the present invention provides an engine having three or more cylinders arranged in a row and two spark plugs each including a first spark plug and a second spark plug for each cylinder. The superstructure includes an ignition coil unit connected to the first and second spark plugs, and an oil filler provided in a head cover of the engine, and the first spark plugs are substantially on the center line of the cylinders. The second spark plug is disposed away from the first spark plug of each cylinder in the cylinder row direction, and the ignition coil unit is inserted into a plug hole so that the first or second spark plug is disposed. A connecting pipe part to which the tip part is connected, and a head part that is provided on the base end side of the connecting pipe part and is exposed on the head cover of the engine, and is continuous in the cylinder row direction. When at least one of a plurality of cylinders adjacent to each other among the at least three cylinders is a pair of cylinders, the second spark plug of one of the pair of cylinders is connected to the other cylinder. The second spark plug of the other cylinder is disposed on the side separated in the cylinder row direction with respect to the one cylinder , and the oil filler portion is disposed on the side separated in the cylinder row direction. The head cover is spaced apart from the center of the pair of cylinders in a direction perpendicular to the cylinder row direction, and is located between one cylinder and the other cylinder in the pair of cylinders .

According to this configuration, there is a space between the two ignition coil units corresponding to the first spark plugs of the pair of adjacent cylinders on the head cover, so that the oil filler portion can be efficiently used using this space. The degree of freedom in designing the head cover can be improved.

  In the present invention, more preferably, the second spark plugs of other cylinders adjacent to the pair of cylinders are disposed on the pair of cylinders, and the other cylinders and the pair of cylinders adjacent thereto are arranged. The ignition coil units corresponding to the second spark plugs respectively provided in one of the two ignition pipes are provided in the two connection pipe portions provided for the respective second spark plugs, and in each of the second spark plugs. An integrated ignition coil unit having the common head.

  As described above, when the integrated ignition coil unit is used as the second ignition plug of the two cylinders that are close to each other, the installation space can be reduced and the maintenance workability can be improved.

  When the engine is an in-line four-cylinder engine, it is more preferable to employ the following configuration. That is, the second spark plugs of two cylinders located on one end side in the cylinder row direction are arranged adjacent to each other, and the second spark plugs of two cylinders located on the other end side in the cylinder row direction are arranged. The ignition coil units arranged adjacent to each other and corresponding to the second spark plugs of the two cylinders on the one end side are the integrated ignition coil units, and the first of the two cylinders on the other end side is the first ignition coil unit. The ignition coil unit corresponding to two ignition plugs is the integrated ignition coil unit, the head of the ignition coil unit has a connector to which electrical wiring is connected, and the connectors of all the ignition coil units are , Projecting to one side of the engine.

The oil filler portion is located between the second cylinder and the third cylinder in the cylinder row direction.

According to these configurations, in the in-line four-cylinder engine, a space for providing the oil filler portion can be formed between the second cylinder and the third cylinder, which are substantially in the center in the cylinder row direction. The head cover can be disposed at the center of the side portion, and the design freedom of the head cover can be further improved. Further, since the connector faces in the same direction, maintenance workability can be improved.

  When the engine is mounted in the engine room in the front portion of the vehicle in a horizontal posture with the cylinder row direction facing the vehicle width direction, the connectors of all the ignition coil units are on the vehicle front side of the engine. It is preferable that the oil filler portion protrudes toward the front side of the vehicle from the center in the width direction of the head cover.

  According to this configuration, it is possible to easily perform electrical wiring maintenance and oil supply from the front of the engine room.

  In the above configuration, more preferably, the integrated ignition coil unit includes a seal member that seals between the connection pipe portion and the head cover, and the seal member surrounds the two connection pipe portions. It has an oval shape for wrapping.

  According to this configuration, it is possible to appropriately ensure the sealing performance while reducing the size of the integrated ignition coil unit by bringing the connecting pipe portion closer to each other.

  As described above, according to the present invention, the degree of freedom in designing the head cover can be improved in an engine provided with a plurality of spark plugs per cylinder.

  FIG. 1 is a plan view of an essential part of an engine A according to an embodiment of the present invention as viewed from above, FIG. 2 (a) is a sectional view around a combustion chamber along line I-II in FIG. b) is a sectional view of the periphery of the combustion chamber taken along line II-III in FIG. 1. As shown in these drawings, the engine A is an in-line four-cylinder gasoline engine in which a plurality of cylinders # 1 to # 4 are arranged in a row from the front end side to the rear end side.

  The engine A is an in-vehicle engine, and is mounted in an engine room (not shown) at the front of the vehicle in a horizontal posture with the cylinder row direction (the arrangement direction of the cylinders # 1 to # 4) oriented in the vehicle width direction. . In FIG. 1, the left side is in front of the vehicle, and an intake device (not shown) is arranged on the side of the engine in the same direction. Further, the right side of FIG. 1 is the rear side of the vehicle, and an exhaust device (not shown) is arranged on the engine side portion in the same direction.

  The engine A includes a cylinder head 1 and a cylinder block 2 (see FIGS. 2A and 2B) that form the cylinders # 1 to # 4. A head cover is provided on the upper portion of the cylinder head 1 so as to cover the upper surface thereof. 10 is provided. The engine A is a high compression ratio engine having a geometric compression ratio of 13 to 15, and two spark plugs composed of first and second spark plugs 3 and 4 are provided for each cylinder # 1 to ##. It is a multi-ignition engine provided every four. Further, the engine A is provided with an in-cylinder pressure sensor 5 for detecting the combustion chamber pressure for each of the cylinders # 1 to # 4 so that a sign such as a self-ignition phenomenon can be detected.

  The first spark plug 3 is inserted into a plug hole 1a provided in the cylinder head 1, and is arranged so that its axis substantially coincides with the center line CL of each cylinder # 1 to # 4. The first spark plug 3 has a distal end facing the combustion chamber, and a proximal end connected to a distal end of a connecting pipe portion 22 of an ignition coil unit 20 described later.

  The second spark plug 4 is inserted into a plug hole 1 b provided in the cylinder head 1, a tip end thereof faces the combustion chamber, and a base end portion is connected to a tip end portion of a connection pipe portion 32 of an ignition coil unit 30 described later. ing. In each of the cylinders # 1 to # 4, the second spark plug 4 is disposed away from the first spark plug 3 in the cylinder row direction, and its axial direction is substantially parallel to the axial direction of the first spark plug 3. It is.

  As shown in FIGS. 1 and 2A, among the cylinders # 1 to # 4, in the cylinders # 1 and # 3, the second spark plug 4 extends from the first spark plug 3 to the rear side in the cylinder row direction. They are spaced apart. Conversely, the in-cylinder pressure sensor 5 is disposed away from the first spark plug 3 on the front side in the cylinder row direction.

  As shown in FIGS. 1 and 2B, among the cylinders # 1 to # 4, in the cylinders # 2 and # 4, the second spark plug 4 is separated from the first spark plug 3 on the front side in the cylinder row direction. Are arranged. On the contrary, the in-cylinder pressure sensor 5 is disposed away from the first spark plug 3 on the rear side in the cylinder row direction.

  That is, in the present embodiment, among the four cylinders # 1 to # 4 that are continuous in the cylinder row direction, the second spark plug 4 of the cylinder # 1 is disposed on the cylinder # 2 side, and the second spark plug of the cylinder # 2 4 is disposed on the cylinder # 1 side, the second spark plug 4 of the cylinder # 3 is disposed on the cylinder # 4 side opposite to the cylinder # 2, and the second spark plug 4 of the cylinder # 4 is disposed on the cylinder # 3 side. Is arranged.

  As a result, the second spark plugs 4 of the two cylinders # 1 and # 2 on the front end side in the cylinder row direction are arranged on the adjacent cylinder # 1 or # 2 side, respectively, and on the rear end side on the rear side in the cylinder row direction The second spark plugs 4 of the two cylinders # 3 and # 4 are disposed on the adjacent cylinder # 3 or # 4 side, respectively.

  On the other hand, for the second spark plugs 4 of the two cylinders # 2 and # 3 adjacent to each other near the center in the cylinder row direction, the second spark plug 4 of the cylinder # 2 is opposite to the cylinder # 3 (relative to the cylinder # 3). The second spark plug 4 of the cylinder # 3 is disposed on the opposite side of the cylinder # 2 (the side spaced apart from the cylinder # 2 in the cylinder row direction). That is, in the present embodiment, among the plurality of cylinder sets adjacent to each other (the group of cylinders # 1 and # 2, the group of cylinders # 2 and # 3, and the group of cylinders # 3 and # 4), The pair of cylinders # 2 and # 3 located closer to each other corresponds to the “pair of cylinders” according to the present invention, and the cylinder # 1 adjacent to the pair of cylinders # 2 and # 3 as the “pair of cylinders” or # 4 corresponds to “a pair of cylinders and another cylinder adjacent to the cylinder” according to the present invention.

  Next, the ignition coil unit 20 will be described. 3A to 3C are a plan view, a bottom view, and a left side view of the ignition coil unit 20, respectively. The ignition coil unit 20 includes a head portion 21 and a connecting pipe portion 22. The head 21 has a connector 21a on one side and a mounting portion 21b on the other side. Electrical wiring for transmitting a control signal from the ECU (engine control unit) and electrical wiring for supplying power from the battery are connected to the connector 21a. The mounting portion 21b has a hole for fixing the ignition coil unit 20 to the head cover 10, and the ignition coil unit 20 has the head cover 10 with the head 21 exposed on the head cover 10, as shown in FIG. Fixed to.

  The head 21 is a hollow case body, and, for example, an igniter, primary / secondary coils, and part of the center / outer core are accommodated therein. A base end portion of the connection pipe portion 22 is connected to the bottom surface of the head portion 21, and an annular outer peripheral seal member 21 c is provided on the bottom surface of the head portion 21 so as to surround the connection pipe portion 22. It has been.

  The connecting pipe portion 22 has a cylindrical body, and accommodates, for example, primary / secondary coils and center / outer cores therein. The connecting pipe portion 22 is inserted into the plug hole 1a, and the tip portion thereof is connected to the first spark plug 3 (FIG. 2). An annular inner peripheral seal member 22 a is provided on the proximal end side of the connection pipe part 22 so as to surround the connection pipe part 22.

  The ignition coil unit 20 is provided for each spark plug 3, and in this embodiment, four ignition coil units 20 are provided according to the number of cylinders as shown in FIG. FIG. 5A is a cross-sectional view taken along line XX in FIG. 1 and shows a configuration of a fixed portion between the ignition coil unit 20 and the head cover 10. As shown in the figure, the head cover 10 is provided with a cylindrical plug hole portion 10 a for each ignition coil unit 20. The ignition coil unit 20 is attached by inserting a connecting pipe portion 22 from above the head cover 10 into the plug hole portion 10 a and the plug hole 1 a of the cylinder head 1. The outer peripheral sealing member 21c is in close contact with the outer peripheral surface of the plug hole portion 10a, and the inner peripheral sealing member 22a is in close contact with the inner peripheral surface of the plug hole portion 10a, so that the connecting pipe portion 22 and the head cover 10, particularly the plug hole portion. 10a is sealed.

  Next, the ignition coil unit 30 will be described. 4A to 4C are a plan view, a bottom view, and a left side view of the ignition coil unit 30, respectively. The ignition coil unit 30 includes a common head portion 31 and two connection pipe portions 32, and is an ignition coil unit integrated with two cylinders. By sharing the head 31, it is possible to reduce the size of the ignition coil for two cylinders.

  The head portion 31 has a connector 31a on one side and an attachment portion 31b on the other side. Electrical wiring for transmitting a control signal from the ECU (engine control unit) and electrical wiring for supplying electric power from the battery are connected to the connector 31a. The attachment portion 31b has a hole for fixing the ignition coil unit 30 to the head cover 10, and the ignition coil unit 30 has the head cover 10 in a state where the head 31 is exposed on the head cover 10 as shown in FIG. Fixed to.

  The head 31 is a hollow case body, and for example, a pair of igniters provided corresponding to the two second spark plugs 4, primary / secondary coils, and part of the center / outer core are contained therein. Stored. A base end portion of two connection pipe portions 32 provided for each second spark plug 4 is connected to the bottom surface of the head portion 31.

  Each connecting pipe portion 32 forms a cylindrical body, in which, for example, primary / secondary coils and center / outer cores are respectively housed. The two connecting pipe portions 32 are arranged so as to be aligned in the cylinder row direction with the ignition coil unit 30 mounted on the engine A, and are integrated on the base end side, and the outer cross-sectional shape is long. It is circular. Each connecting pipe part 22 is inserted into the plug hole 1b, and the tip part thereof is connected to the two second spark plugs 4 (FIG. 2).

  An oval outer peripheral seal member 31 c is provided on the bottom surface of the head portion 31 so as to surround the two connecting pipe portions 32. Further, an oval inner peripheral sealing member 32 a is provided on the base end side of the connecting pipe portion 32 so as to surround the two connecting pipe portions 32.

  The ignition coil unit 30 is shared between the two second spark plugs 4 and, as shown in FIG. 1, two ignition coil units 30 that are half the number of cylinders are provided in this embodiment. Specifically, as shown in FIG. 1, one ignition coil unit 30 is provided for the cylinders # 1 and # 2 on the front end side in the cylinder row direction of the engine A, and on the rear end side in the cylinder row direction. One ignition coil unit 30 is provided for the cylinders # 3 and # 4.

  FIG. 5B is a cross-sectional view taken along line YY in FIG. 1 and shows a configuration of a fixed portion between the ignition coil unit 30 and the head cover 10. As shown in the figure, the head cover 10 is provided with a plug hole portion 10b into which the connection pipe portion 32 of the ignition coil unit 30 is inserted. The plug hole portion 10b is formed in an oval shape that is long in the cylinder row direction, and one plug hole portion 10b corresponds to each of the cylinder # 1, # 2 group and the cylinder # 3, # 4 group (two in total). ) Is provided. And in each plug hole part 10b, the two connection pipe parts 32 of the ignition coil unit 30 corresponding to the set of cylinders # 1 and # 2, and the ignition coil unit 30 corresponding to the set of cylinders # 3 and # 4 are provided. Two connecting pipe portions 32 are inserted respectively.

  The ignition coil unit 30 is attached by inserting a connecting pipe portion 32 from above the head cover 10 into the plug hole portion 10 b and the plug hole 1 b of the cylinder head 1. The outer peripheral seal member 31c is in close contact with the oval outer peripheral surface of the plug hole portion 10b, and the inner peripheral seal member 32a is in close contact with the oval inner peripheral surface of the plug hole portion 10b, whereby the connecting pipe portion 32 is adhered. And the head cover 10, particularly the plug hole portion 10b. By forming the outer peripheral seal member 31c and the inner peripheral seal member 32a into an oval shape surrounding the two connection pipe portions 32, the connection pipe portion 32 is brought closer to each other, and the ignition coil unit 30 is reduced in size. Sex can be secured appropriately.

  Referring to FIG. 1, ignition coil units 20 and 30 are arranged at the center of head cover 10 in the width direction (direction perpendicular to the cylinder row direction). The connectors 21a and 31a of the heads 21 and 31 of the ignition coil units 20 and 30 all project to the left side in the drawing corresponding to the intake side of the engine A (that is, the side of the engine A on the vehicle front side).

  An oil filler portion 11 is provided at a position spaced from the center in the width direction of the head cover 10 to the left side (that is, the front side of the vehicle), and an oil separator chamber 12 for a blow-by bus is provided at a position spaced from the right side. The oil filler portion 11 is located between the cylinder # 2 and the cylinder # 3 when viewed in the cylinder row direction.

Next, advantages of this embodiment will be described. In the present embodiment, since the second spark plug 4 is arranged as described above, two ignition coil units corresponding to the first spark plugs 3 of the pair of adjacent cylinders # 2 and # 3 on the head cover 10 are provided. during the 20 results in the ignition coil unit 30 for the second spark plugs 4 does not exist, by utilizing the space formed on the unit, the OIL filler unit 1 1, the ignition coil unit 20 and 30 The head cover 10 can be efficiently arranged without interference, and the design freedom of the head cover 10 can be improved. For the second spark plugs 4 of the cylinders # 1 and # 2 or the cylinders # 3 and # 4 that are close to each other, a two-cylinder integrated ignition coil unit 30 that shares the head 31 is used. Thus, the installation space can be reduced, and the ignition coils for two cylinders can be attached and detached simultaneously, so that maintenance workability can be improved.

  Here, since auxiliary machinery is generally disposed at the front end portion in the cylinder row direction of the engine, it is not preferable to dispose the oil filler portion 11 or the like at the front end portion on the head cover 10. On the other hand, in the present embodiment, in the in-line four-cylinder engine, the space for providing the oil filler portion 11 is formed between the cylinder # 2 and the cylinder # 3, that is, approximately at the center in the cylinder row direction. The degree of freedom can be improved more effectively. In particular, the oil filler part 11 may be disposed away from auxiliary equipment such as an alternator that is liable to be deteriorated by the oil because the oil may leak or scatter around when the oil is replenished. However, in the present embodiment, since the oil filler portion 11 is provided in the center of the side portion of the head cover 10 located substantially in the center in the cylinder row direction, the oil filler portion 11 can be disposed sufficiently away from the auxiliary machinery, It is possible to effectively prevent the oil leaked or scattered from the oil filler portion 11 from adhering to the auxiliary machinery.

  In addition, since the connectors 21a and 31a face in the same direction, maintenance workability such as electrical wiring connection work can be improved. In particular, in the above-described embodiment, the connectors 21a and 31a are directed to the front side of the vehicle, so that the electrical wiring maintenance work and the like can be easily performed from the front of the engine room. Furthermore, since the oil filler portion 11 is arranged at a position offset toward the vehicle front side from the center portion of the head cover 10 in the width direction (direction orthogonal to the cylinder row direction), the operation of replenishing oil is also performed in front of the engine room. Can be easily done.

  In the above embodiment, the head 31 of the integrated ignition coil unit 30 provided corresponding to the two second spark plugs 4 in each set of the cylinders # 1, # 2 and the cylinders # 3, # 4 A common connector 31a for connecting electrical wiring is provided, and control signals and power are sent to the two second spark plugs 4 through the single connector 31a. For example, as shown in FIG. In addition, a pair of connectors 31a1 and 31a2 respectively corresponding to the two second spark plugs 4 may be provided independently on the head 31 of the ignition coil unit 30.

  Further, in the above embodiment, an integrated ignition coil unit corresponding to each ignition plug 4 of two cylinders (# 1, # 2 or # 3, # 4) in which the second ignition plug 4 is adjacent to each other. 30 is provided, but one independent ignition coil unit corresponding to each ignition plug 4 may be provided for each cylinder.

  Further, in the above embodiment, among the cylinders # 1 to # 4 provided in the in-line four-cylinder engine A, the second spark plug 4 of the cylinder # 2 is separated from the cylinder # 3 on the opposite side (relative to the cylinder # 3 in the cylinder row direction). By placing the second spark plug 4 of cylinder # 3 on the opposite side of cylinder # 2 (side away from cylinder # 2 in the cylinder row direction), the cylinder # 3 is positioned closer to the center of the cylinder row direction. The two cylinders # 2 and # 3 have been described as corresponding to the “pair of cylinders” according to the present invention. However, the above description applies to the set of cylinders # 1 and # 2 or the set of cylinders # 3 and # 4. Of course, it is also possible to adopt the same configuration as in FIG.

  For example, when it is assumed that the cylinders # 1 and # 2 are “a pair of cylinders” according to the present invention, the second ignition plug 4 of the cylinder # 1 is disposed on the opposite side of the cylinder # 2, and the second ignition of the cylinder # 2 is performed. The plugs 4 are respectively arranged on the opposite side of the cylinder # 1. In this case, if the second spark plug 4 of the cylinder # 3 adjacent to the combination of the cylinders # 1 and # 2 is disposed on the cylinder # 2 side, the spark plug 4 of the cylinder # 2 and the cylinder # 3 Since the spark plugs 4 are adjacent to each other, an integrated ignition coil unit 30 can be provided for each spark plug 4 of both cylinders # 2 and # 3.

  Moreover, although the said embodiment demonstrated the example which applied the structure of this invention to the engine A which consists of an inline 4 cylinder engine, the structure of this invention is not restricted to an inline 4 cylinder engine, For example, an inline 3 cylinder engine, an inline The present invention can also be suitably applied to a 5-cylinder engine, an in-line 6-cylinder engine, or a V-type engine having three or more cylinders in one bank.

It is a top view of the important section of engine A concerning one embodiment of the present invention. (A) is sectional drawing of the combustion chamber periphery along line I-II of FIG. 1, (b) is sectional drawing of the combustion chamber periphery along line II-III of FIG. (A) thru | or (c) are the top views, bottom views, and left side views of the ignition coil unit 20, respectively. (A) thru | or (c) are the top views, bottom views, and left side views of the ignition coil unit 30, respectively. (A) is sectional drawing in alignment with line XX of FIG. 1, (b) is sectional drawing in alignment with line YY of FIG. 1, The structure of the fixing | fixed part of the ignition coil units 20 and 30 and the head cover 10 is shown. Show. It is a figure for demonstrating the deformation | transformation Example of this invention.

A Engine # 1 to # 4 Cylinder 1a, 1b Plug hole 3 First spark plug 4 Second spark plug 10 Head cover 11 Oil filler part 20, 30 Ignition coil unit 21, 31 Head part 21a, 31a Connector 22, 32 Connecting pipe part 31c, 32a Seal member CL (Cylinder) center line

Claims (6)

In an upper structure of an engine having three or more cylinders arranged in a row and having two spark plugs each composed of a first spark plug and a second spark plug for each cylinder,
An ignition coil unit connected to the first and second spark plugs, and an oil filler provided in a head cover of the engine ,
The first spark plug is disposed on a substantially center line of each cylinder,
The second spark plug is disposed away from the first spark plug of each cylinder in the cylinder row direction,
The ignition coil unit is inserted into a plug hole and connected to a tip end portion of the first or second spark plug, and is provided on a base end side of the connection tube portion so as to be mounted on the engine head cover. With a head exposed to
When at least one of a plurality of cylinders adjacent to each other among at least three cylinders continuous in the cylinder row direction is a pair of cylinders, the second spark plug of one cylinder of the pair of cylinders is The second spark plug of the other cylinder is disposed on the side separated in the cylinder row direction with respect to the one cylinder ,
The oil filler portion is spaced apart from the center of the head cover in a direction orthogonal to the cylinder row direction, and is positioned between one cylinder and the other cylinder in the pair of cylinders in the cylinder row direction. The superstructure of the engine as a feature. The second spark plugs of other cylinders adjacent to the pair of cylinders are disposed on the pair of cylinders;
The ignition coil unit corresponding to the second spark plug provided in each of the other cylinder and one of the pair of cylinders adjacent thereto is provided for each second spark plug. The upper structure of an engine according to claim 1, wherein the upper structure of the engine is an integrated ignition coil unit including two connecting pipe portions and the head portion common to each of the second spark plugs. The engine is an in-line four-cylinder engine;
The second spark plugs of two cylinders located on one end side in the cylinder row direction are disposed adjacent to each other;
The second spark plugs of the two cylinders located on the other end side in the cylinder row direction are arranged adjacent to each other;
The ignition coil unit corresponding to the second ignition plug of the two cylinders on the one end side is the integrated ignition coil unit;
The ignition coil unit corresponding to the second spark plug of the two cylinders on the other end side is the integrated ignition coil unit;
The head of the ignition coil unit has a connector to which electrical wiring is connected,
The engine superstructure according to claim 2, wherein the connectors of all the ignition coil units protrude to one side of the engine. Superstructure for an engine according to claim 3 before Symbol oil filler section, characterized in that located between the second of said cylinders and the third of said cylinders in the gas cylinder row direction. The engine is mounted in the engine room at the front of the vehicle in a landscape orientation with the cylinder row direction facing the vehicle width direction,
The connectors of all the ignition coil units protrude to the vehicle front side of the engine,
The engine upper structure according to claim 4, wherein the oil filler portion is located on the vehicle front side from the center in the width direction of the head cover. The integral ignition coil unit has a seal member that seals between the connection pipe portion and the head cover,
The engine upper structure according to any one of claims 2 to 5, wherein the seal member has an oval shape surrounding the two connecting pipe portions.

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