Abstract: In a rotation speed detecting apparatus of an internal combustion engine having a rotor supported by an end part of the crankshaft, a pulser ring that has a detected body composed of recess-projection teeth and rotates integrally with the rotor, and a detector that detects the rotation speed of the crankshaft by detecting the detected body, the detected body has a detected surface opposed to the detector, and the detected surface is inclined in such a manner as to be located closer to the outside of the crankshaft in the axial direction of the crankshaft as getting more apart from an axis line of the crankshaft in the radial direction. In the detector, an axis line of the detector is inclined with respect to the axis line of the crankshaft in such a manner that the detector is opposed to the detected surface.

Abstract: An ignition coil has primary and secondary coils, a coil casing having a casing body, an accommodating part and a high voltage tower shaped part of a cylindrical shape, a resistance member arranged as a movable member in a tower through hole of the high voltage tower, a high voltage cap, and an insulation resin member with which the accommodating part is filled. A proximal end part of the tower through hole has an inner diameter which is greater than an outer diameter of a maximum outer diameter part of the resistance member. A distal end part of the tower through hole has an inner diameter which is less than the outer diameter of the maximum outer diameter part of the resistance member. A vent part is formed, through which the proximal end part of the tower through hole communicates with the distal end part of the tower through hole.

Abstract: An ignition coil is provided with a primary coil, a secondary coil, a center core, and an outer core. The primary coil, secondary coil, the center core, and the outer core are accommodated inside a case, the inside of the case is filled with a resin filler having electrical insulating properties. The case has an opening member which opens to an upper-side of a vertical direction, a side wall section formed by the opening member, and a bottom member covering a lower-side of the side wall section. A circular cover member, formed on the opening member, provided with a through opening which passes through the inner-side of the opening member in the vertical direction.

Abstract: In accordance with one embodiment, an ignition coil assembly includes an ignition coil cover, a boot, and an ignition coil. The ignition coil cover includes a plurality of fins, an opening, and a channel. The boot includes a slotted opening and a centralized orifice and is configured to be disposed within the opening of the ignition coil cover. The ignition coil includes a seat and a tab. The ignition coil is configured to be disposed within the centralized orifice. The seat is capable of supporting the ignition coil within the centralized orifice of the boot. The tab is configured to be inserted into the slotted opening and the channel when the ignition coil is disposed within the centralized office and the boot is disposed within the opening.

Abstract: A system for a cylinder head is provided. The system comprises a cam cover mounted on the cylinder head and including an oil separator and a coil on plug (COP) coupled to the oil separator via a snap-fit connection. The snap-fit connection holds the coil-on-plug in position and may provide a lower cost alternative to existing systems of retaining coil-on-plugs on a cam cover.

Abstract: An ignition coil for the internal combustion engine has a cylinder portion and a head portion. A pillar portion that forms a part of a ventilation passage that communicates inside and outside of a plug hole via a sealing member, and a cover portion that covers the pillar portion without blockading an upper opening of a ventilation opening of the pillar portion are formed on a side of the head portion.

Abstract: An electronic ignition module for vintage automobiles that utilizes existing components and wiring to retain the look and operation of the original system but with superior performance. The ignition module replaces the original roller and contacts of a vintage automobile ignition timer with modern control electronics that actuate the original coils and original spark plugs using the original wiring in the original manor. Electronic ignition operation is user programmable to emulate the original roller/timer performance or provide automatic spark advance similar to modern automobile operation for optimum power and efficiency while freeing the operator from manual adjustment of spark timing. Ignition module programming is accomplished without any external switches, buttons, jumpers or modification to the vintage automobile by simply sensing the presence or absence of ignition coils connected to the system when power is applied.

Abstract: An ignition coil includes a central core, a primary winding, a spool, a secondary winding, and a case outward of the core, spool, primary winding, and secondary winding. The secondary winding is wound on the spool and includes a high voltage end. The ignition coil also includes a cup formed of a metal material in electrical communication with the high voltage end of the secondary winding and is configured to be contacted by a conductive connector that is suitable for connection to a spark plug. The cup includes a generally cylindrical first sidewall press fit with the case and defining a press fit area at the interface of the first sidewall and the case, a generally cylindrical second sidewall spaced radially from the first sidewall, and an annular space defined between the press fit area and the second sidewall.

Abstract: Embodiments of injectors configured for adaptively injecting and igniting various fuels in a combustion chamber are disclosed herein. An injector according to one embodiment includes an end portion configured to be positioned adjacent to a combustion chamber, and an ignition feature carried by the end portion and configured to generate an ignition event. The injector also includes a force generator assembly and a movable valve. The force generator assembly includes a first force generator separate from a second force generator. The first force generator creates a motive force to move the valve between the closed and open positions into the combustion chamber. The second force generator is electrically coupled to the ignition feature and provides voltage to the ignition feature to at least partially generate the ignition event.

Abstract: In a plughole waterproofing device for an engine, a coil case is fitted onto the ignition coil that is accommodated in a plughole of an engine, and an upper portion of the case protruding above the engine is provided with a longitudinal air path extending upward from a lower end thereof communicating with the plughole and a vent hole communicating with an upper end portion of the air path and opened to ambient air. A cover wall hanging while surrounding the vent hole is continuously provided on the case upper portion, and an air chamber is formed inside the cover wall, the vent hole being opened in an upper portion of the air chamber, and an opening face being formed at an entire bottom of the air chamber opening toward the engine.

Abstract: A spark-ignition engine comprises a plug hole (13) formed in a cylinder head (2), an ignition plug (10) and a plug cap (9) of the type integral with an ignition coil, which is attached to the ignition plug (10) as it is inserted into the plug hole (13). In this spark-ignition engine, the plug hole (13) is arranged at a position outside a head cover (5) in the cylinder head (2), a head surface (2a) of which is opened to provide the plug hole (13) and has a plug-cap attaching flange (11) attached thereto, and the plug-cap attaching flange (11) is formed with an extending cylinder-portion (15A) having an extension-hole (15) communicated with the plug hole (13). The plug cap (9), as it is inserted from the extension hole (15A) into the plug hole (13), has a coil portion (9C) fixed to the extending cylinder-portion (15).

Abstract: A high voltage resonator-amplifier for a radiofrequency ignition system that can be used in an internal combustion engine, the resonator-amplifier including at least two electrodes, a coil arranged in alignment with the electrodes along a longitudinal axis, and a linking mechanism retaining the coil and the electrodes in a relatively fixed position. The coil is wound around a closed bend which in turn wraps around the longitudinal axis.

Abstract: The transformer (10) comprises a core (12), a primary winding (14) and a secondary winding 16. The core comprises an elongate limb (13) having a main axis (15) and comprising a plurality of segments (12.1 to 12.n) of a magnetic material and gaps (18.1 to 18.n?1) between segments arranged in alternating relationship along the main axis (15). The main axis (15) is parallel to a direction of a magnetic field in the limb (13). Each gap has a linear segment separating extent (gj which is parallel to the main axis (15). The value of n is larger than three and the gaps are filled with an isolation medium (20).

Abstract: A primary coil of an ignition coil has a socket with a side wall having an opening, a center core having a body portion with a root located in the opening and a collar portion extending perpendicularly from the root, and a winding wound on the body portion while the socket catches start and end portions of the winding on respective winding start and end sides. The collar portion is held in the socket. The core is formed by compressing magnetic powder in two divided dies divided through dividing lines which extend along a diagonal line of a rectangle formed by projecting the collar portion on a plane perpendicular to a center axis of the core. The root on the diagonal line is exposed to the opening on the winding start side and is covered with the side wall on the winding end side.

Abstract: This invention is directed to a device for energy storage and transformation that allows an increased level of energy storable in an ignition coil, using a coil that has a permanent magnet inside of a primary magnetic core, with a second magnetic core that closes the magnetic path of the primary magnetic core.

Abstract: A spark plug coil assembly has a primary core bearing primary windings and a secondary winding spool around which secondary windings are wound and in which the primary core is received. A case receives the spool with core. The entire case can be made of composite Iron to function as a magnetic return path for the core, or a composite Iron shield can be overmolded to an otherwise plastic case.

Abstract: A system for a cylinder head is provided. The system comprises a cam cover mounted on the cylinder head and including an oil separator and a coil on plug (COP) coupled to the oil separator via a snap-fit connection. The snap-fit connection holds the coil-on-plug in position and may provide a lower cost alternative to existing systems of retaining coil-on-plugs on a cam cover.

Abstract: A power unit for portable chain saws wherein an ignition coil is placed at a position so as to increase both the compactness and the cooling efficiency of the power unit. A coil support on which the ignition coil is supported is formed integratedly with a crank case; adjacent to an open port; and on a part of an external periphery of the flywheel, said second part being not enclosed by the air-guiding passage. The coil support extends from the crank case along a side of a muffler and forms an insulating gap from the muffler.

Abstract: An ignitor assembly constructed in accordance with one aspect of the invention has an upper inductor subassembly coupled to a lower firing end subassembly for relative pivot movement between the subassemblies. The upper inductor subassembly includes a tubular housing with inductor windings received therein with an upper electrical connector adjacent an upper end of the housing and a lower electrical connector adjacent a lower end of the housing. The lower firing end subassembly includes a ceramic insulator and a metal housing surrounding at least a portion of the ceramic insulator. The ceramic insulator has an electrical terminal extending from a terminal end and an electrode extending from a firing end. A flexible tube couples the upper inductor subassembly to the lower firing end subassembly and maintains the electrical terminal of the lower firing end subassembly in electrical contact with the lower electrical connector of the upper at a pivot joint.

Abstract: Embodiments of injectors configured for adaptively injecting and igniting various fuels in a combustion chamber are disclosed herein. An injector according to one embodiment includes an end portion configured to be positioned adjacent to a combustion chamber, and an ignition feature carried by the end portion and configured to generate an ignition event. The injector also includes a force generator assembly and a movable valve. The force generator assembly includes a first force generator separate from a second force generator. The first force generator creates a motive force to move the valve between the closed and open positions into the combustion chamber. The second force generator is electrically coupled to the ignition feature and provides voltage to the ignition feature to at least partially generate the ignition event.

Abstract: An ignition coil for the internal combustion engine has a cylinder portion and a head portion. A pillar portion that forms a part of a ventilation passage that communicates inside and outside of a plug hole via a sealing member, and a cover portion that covers the pillar portion without blockading an upper opening of a ventilation opening of the pillar portion are formed on a side of the head portion.

Abstract: A retaining apparatus is provided for mating an ignition coil to a spark plug.

Abstract: An ignition coil device mounted on the cylinder head of an internal combustion engine. The ignition coil includes: a cylindrical pipe inserted into a plug hole while a first clearance is formed between the cylindrical pipe and the plug hole; a coil tower arranged over the cylindrical pipe; a seal member arranged below the coil tower for sealing the plug hole; and a cover arranged between the seal member and the coil tower. The seal member is formed with an air bleeding hole extending from the first clearance to a side of the coil tower. The air bleeding hole includes a protruding opening. A circumferential wall portion is positioned on the outer circumference side of the protruding opening while a second clearance is formed between the cover and a periphery of the protruding opening.

Abstract: An ignition coil assembly mounted on a valve cover whereby the plurality of coils connected to the ignition coil assembly are individually removable. The ignition coil assembly comprises a base plate and coil bracket that rotateably couple, preferably with a hinging element, allowing for access and removal of individual coils as from the engine or valve cover. The coil bracket is also able to be removed from the base member. A preferred embodiment involves locking the assembly in place with fasteners. A method for manufacture of the ignition coil assembly with the steps of rotateably coupling the base plate and coil bracket. A method for replacing ignition coils from an engine comprising separating the coil bracket from the base plate, removing and replacing individual ignition coils, and locking the coil bracket to the base plate.

Abstract: Disclosed is an upper structure of an engine having three or more cylinders arranged in a row. A first one of a pair of adjacent cylinders among at least three of the cylinders serially arranged in a cylinder row direction is provided with a second spark plug at a position on an opposite side of a second one of the pair of adjacent cylinders, and the second one of the pair of adjacent cylinders is provided with a second spark plug at a position on an opposite side of the first one of the pair of adjacent cylinders. The present invention can provide enhanced flexibility in design of a head cover of the engine.

Abstract: An ignition coil configured for electrical communication with a spark plug of an internal combustion engine has a primary spool and a secondary spool. The primary spool has a bore and an outer surface with a low-voltage winding supported thereon. The secondary spool has a cavity with a magnetic core received therein and a substantially cylindrical outer surface. The secondary spool is received at least partially in the bore of the primary spool. A high-voltage winding is supported on the outer surface of the secondary spool. The high-voltage winding has discrete winding sectors spaced from one another along a length of the secondary spool.

Abstract: The invention relates to an ignition coil for an internal combustion engine. Said ignition coil comprises a primary coil base (2) carrying a primary winding (1) and having an especially cylindrical shape, a low voltage connection area (10) for connecting the primary winding (1) to a low voltage, a secondary winding (3) inductively coupled to the primary winding (1) and disposed on an especially cylindrical secondary coil base (4), for providing a high voltage for the spark plug of the internal combustion engine. The primary coil base (2) and the secondary coil base (4) are mounted concentric to one another. The ignition coil also comprises a high-voltage connection area (5) in which the secondary winding (3) contacts the spark plug. The aim of the invention is to improve the ignition coil of the aforementioned type with respect to its electromagnetic compatibility.

Abstract: A motorcycle includes a fuel tank mounted on a main frame member, an engine arranged below the main frame member, and ignition coils arranged below the fuel tank. The main frame member includes a pair of sub-frame members arranged in a vehicle-width direction in a spaced-apart manner. A coil-holding structure, formed of a plastic resin material, is disposed on the main frame member for arranging the ignition coils thereon between the pair of sub-frame members. A base portion of the coil-holding structure has one or more openings formed therein so as to expose portions of the ignition coils to a traveling wind, during vehicle operation. One of the ignition coils, which is arranged close to a rear side of a vehicle body, is disposed at a position lower than a position of the ignition coil which is arranged close to a front side of the vehicle body.

Abstract: An ignition coil includes a coil body, a primary resin molded body, and a secondary resin molded body. The coil body has a primary coil and a secondary coil. The primary resin molded body has the coil body therein in a fixed relation, and the primary resin molded body has a plurality of exposed side portions that hold the coil body therebetween. The secondary resin molded body is molded to have the coil body and the primary resin molded body embedded therein. The secondary resin molded body is configured to allow the plurality of exposed side portions of the primary resin molded body to be exposed to an exterior of the secondary resin molded body.

Abstract: An ignition coil is equipped with a sparkplug of an engine. The ignition coil includes a coil portion, a tower portion, and a plug cap. The coil portion includes a coil case accommodating a primary and secondary coils being coaxial with each other. The coil portion has an end connected with the plug cap via the tower portion. The plug cap is press-fitted with the sparkplug. The coil case has an outer periphery from which a flange portion projects radially outward in a flange-projecting direction. The tower cylinder portion has a tower axis substantially in parallel with a coil axis of the primary and secondary coils. The tower axis is offset from the coil axis in a tower-offset direction. The tower-offset direction is substantially the same as the flange-projecting direction.

Abstract: A spark-ignition engine comprises a plug hole (13) formed in a cylinder head (2), an ignition plug (10) and a plug cap (9) of the type integral with an ignition coil, which is attached to the ignition plug (10) as it is inserted into the plug hole (13). In this spark-ignition engine, the plug hole (13) is arranged at a position outside a head cover (5) in the cylinder head (2), a head surface (2a) of which is opened to provide the plug hole (13) and has a plug-cap attaching flange (11) attached thereto, and the plug-cap attaching flange (11) is formed with an extending cylinder-portion (15A) having an extension-hole (15) communicated with the plug hole (13). The plug cap (9), as it is inserted from the extension hole (15A) into the plug hole (13), has a coil portion (9C) fixed to the extending cylinder-portion (15).

Abstract: An ignition coil of a dual ignition type that can prevent outputs from becoming unbalanced due to a difference in floating capacitance on wiring that connects secondary output terminals and ignition plugs together, thus realizing balanced outputs. A coil assembly housed in a housing as a coil case has a primary coil and secondary coils disposed concentrically with the primary coil. The secondary coils are comprised of two coils wound in opposite directions with the center of winding width being a boundary. The center of the winding width of the primary coil is shifted from the center of the winding width of the secondary coils by a predetermined width so as to balance outputs from the two secondary coils. A casting material is filled into a gap between the housing and the coil assembly and gaps which the coil assembly has.

Abstract: An improved rocker arm cover assembly having an upper coil chamber that is enclosed and a lower rocker arm chamber that includes special seal and flange members to isolate it from the engine head. The fully enclosed upper coil chamber includes a mounting plate on which a plurality of coils is mounted. A fully isolated, dual function, oil fill/PCV valve, conduit is provided through the upper chamber to permit adding lubrication oil or permitting exhaust of crankcase vapors without contaminating the coils. Several variations of coils and coil mounting brackets are disclosed.

Abstract: An ignition coil assembly mounted on a valve cover whereby the plurality of coils connected to the ignition coil assembly are individually removable. The ignition coil assembly comprises a base plate and coil bracket that rotateably couple, preferably with a hinging element, allowing for access and removal of individual coils as from the engine or valve cover. The coil bracket is also able to be removed from the base member. A preferred embodiment involves locking the assembly in place with fasteners. A method for manufacture of the ignition coil assembly with the steps of rotateably coupling the base plate and coil bracket. A method for replacing ignition coils from an engine comprising separating the coil bracket from the base plate, removing and replacing individual ignition coils, and locking the coil bracket to the base plate.

Abstract: A power unit for portable chain saws wherein an ignition coil is placed at a position so as to increase both the compactness and the cooling efficiency of the power unit. A coil support on which the ignition coil is supported is formed integratedly with a crank case; adjacent to an open port; and on a part of an external periphery of the flywheel, said second part being not enclosed by the air-guiding passage. The coil support extends from the crank case along a side of a muffler and forms an insulating gap from the muffler.

Abstract: An ignition coil device mounted on the cylinder head of an internal combustion engine. The ignition coil includes: a cylindrical pipe inserted into a plug hole while a first clearance is formed between the cylindrical pipe and the plug hole; a coil tower arranged over the cylindrical pipe; a seal member arranged below the coil tower for sealing the plug hole; and a cover arranged between the seal member and the coil tower. The seal member is formed with an air bleeding hole extending from the first clearance to a side of the coil tower. The air bleeding hole includes a protruding opening. A circumferential wall portion is positioned on the outer circumference side of the protruding opening while a second clearance is formed between the cover and a periphery of the protruding opening.

Abstract: An ignition coil includes primary and secondary coils, center and outer cores, and an ion current detector for transmitting an ion current detection output. The center core has an axial upper end defining a center core upper end surface. The outer core has an axial upper end defining an outer core upper end surface. The center core upper end surface axially protrudes upwardly relative to the outer core upper end surface. The center core upper end surface is located at a stagger distance axially from the outer core upper end surface. The stagger distance is defined such that a detection period for residual magnetic noise in the ion current detection output falls within a system requirement period of a control unit.

Abstract: An ignition coil device mounted on the cylinder head of an internal combustion engine. The ignition coil includes: a cylindrical pipe inserted into a plug hole while a first clearance is formed between the cylindrical pipe and the plug hole; a coil tower arranged over the cylindrical pipe; a seal member arranged below the coil tower for sealing the plug hole; and a cover arranged between the seal member and the coil tower. The seal member is formed with an air bleeding hole extending from the first clearance to a side of the coil tower. The air bleeding hole includes a protruding opening. A circumferential wall portion is positioned on the outer circumference side of the protruding opening while a second clearance is formed between the cover and a periphery of the protruding opening.

Abstract: An ignition coil includes a coil part having primary and secondary coils, a center core, and a peripheral core, a connector case part, a seal rubber, and a ventilation passage. The coil part is inserted in a plug hole of an engine, and the case part is outside the plug hole. An axial end of the peripheral core is inserted in an insertion hole of the case part. The peripheral core and an inner wall surface of the insertion hole define a ventilation clearance therebetween. A gap between the case part and the plug hole is sealed with the rubber. The rubber is closely-attached to the plug hole and the case part along its whole circumference. The passage, through which the plug hole is ventilated, includes the clearance and a ventilation hole formed at a certain position of the case part away from the rubber to communicate with the clearance.

Abstract: A housing of an ignition coil has an approximately rectangular shape. A central core is in parallel with both side surfaces of the housing. The peripheral core has a larger size than the central core in a direction of a height of the housing. A first and second side portions of the peripheral core are opposed to both axial end surfaces of the central core, respectively. A third and fourth side portions of the peripheral core interpose the central core, a primary coil and a secondary coil therebetween to magnetically connect the first side portion to the second side portion. A terminal treatment portion for electrically connecting the primary coil to an external electric power source is arranged above or below the first side portion of the peripheral core. The peripheral core is positioned off-center with respect to the central core in the direction of the height of the housing.

Abstract: A motorcycle includes a fuel tank mounted on a main frame member, an engine arranged below the main frame member, and ignition coils arranged below the fuel tank. The main frame member includes a pair of sub-frame members arranged in a vehicle-width direction in a spaced-apart manner. A coil-holding structure, formed of a plastic resin material, is disposed on the main frame member for arranging the ignition coils thereon between the pair of sub-frame members. A base portion of the coil-holding structure has one or more openings formed therein so as to expose portions of the ignition coils to a traveling wind, during vehicle operation. One of the ignition coils, which is arranged close to a rear side of a vehicle body, is disposed at a position lower than a position of the ignition coil which is arranged close to a front side of the vehicle body.

Abstract: An internal combustion engine cover includes a peripheral rail for attaching a cover to an engine component and an enclosure portion formed integrally with a peripheral rail. At least one port formed in the enclosure portion holds an electronic module which is mounted through the port and which may include an oil separator as well as an electronic device.

Abstract: An ignition apparatus includes an oil seal integrated with a spark plug boot and configured to mate with a cylinder head so as to seal the oil that is found under the cam cover from the spark plug and high voltage terminal of the plug. The cylinder head includes a ring-cavity recessed in the head surrounding the spark plug. The spark plug boot includes an annular sealing rib on a lowermost axial end. The sealing rib is configured in size and shape to effect an interference fit in the ring cavity. The ignition apparatus includes another seal integrated at the top to seal to the cam cover. The two integrated seals eliminate the need for a spark plug tube.

Abstract: The invention in one form is directed to an ignition terminal for coupling an internal combustion engine coil-on-plug ignition coil assembly with a spark plug. The ignition terminal includes an electrical conductor defining a bore therethrough and includes a first end. The first end includes an overlapped member and an overlapping member at least partially overlapping the overlapped member, the overlapped and overlapping members being configured for coupling the first end with the spark plug using the bore. The overlapped and overlapping members are monolithic relative to one another.

Abstract: The rotation of an ignition coil apparatus upon mounting thereof on an internal combustion engine is prevented with a simple structure, and the efficiency of mounting the ignition coil apparatus on the internal combustion engine is improved. A high voltage tower is formed integrally with a case main body having a transformer received therein, and holds a high voltage output terminal therein. A cylindrical plug boot has its one end attached to the high voltage tower. The plug boot is inserted into a plug hole in an internal combustion engine main body whereby the ignition coil apparatus is mounted on the internal combustion engine main body through a head cover having upstanding wall portions. A pair of protrusions for restricting the rotation of the casing main body around an axis of the plug hole are formed on a surface of the casing main body in opposition to the wall portions.

Abstract: An ignition coil assembly for an engine includes an ignition coil for supplying a voltage to a spark plug, a housing supporting the ignition coil, a driving circuit board disposed on the housing and including a circuit unit controlling the ignition coil, and a center cover protecting the driving circuit board. The ignition coil is electrically connected to the driving circuit board.

Abstract: An improved rocker arm cover assembly having an upper coil chamber that is enclosed and a lower rocker arm chamber that includes special seal and flange members to isolate it from the engine head. The fully enclosed upper coil chamber includes a mounting plate on which a plurality of coils is mounted. A fully isolated, dual function, oil fill/PCV valve, conduit is provided through the upper chamber to permit adding lubrication oil or permitting exhaust of crankcase vapors without contaminating the coils. Several variations of coils and coil mounting brackets are disclosed.

Abstract: An ignition coil for an internal combustion engine can increase a contact area between an end of a GND line terminal and a bolt thereby to reduce the contact resistance therebetween. In the ignition coil, a GND potential is ensured by the GND line terminal that is electrically connected at one end thereof to an igniter and at the other end thereof to the internal combustion engine through a bolt inserted into a bolt insertion hole formed in a mounting flange. The GND line terminal is formed at the other end thereof with a bearing surface portion having a hole into which the bolt is inserted. At least part of an inner diameter of the hole in the bearing surface portion is smaller than an inner diameter of the bolt insertion hole.

Abstract: A rocker arm cover comprises a shell having an upper portion and a lower portion formed by inner and outer side walls and end walls contiguous therewith. A dividing wall is joined to the side walls and end walls to define an upper cavity in the upper portion of the rocker arm cover and to define a lower cavity in the lower part of the rocker arm cover. A lid is fitted to the upper portion of the rocker arm cover to provide an enclosed cavity for housing the plurality of ignition coils.

Abstract: An ignition coil assembly for an engine includes an ignition coil for supplying a voltage to a spark plug, a housing supporting the ignition coil, a driving circuit board disposed on the housing and including a circuit unit controlling the ignition coil, and a center cover protecting the driving circuit board. The ignition coil is electrically connected to the driving circuit board.