Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Yukio Konishi

Hirotaka Ogino

Takayuki Takatoku

Hiroaki Sato

Chikara Tanaka

Hirosuke Niwa

Kazushi Tada

Tomoji Suganami

Hidehiko Kamiyama

Junya Iino

Makoto Ito

Kaori Takehana

Takuya Ono

Takuma Adachi

Hikaru Ueno

Masahiro Takehana

The disclosure prevents oil separated from blow-by gas by using a breather chamber and discharged to a valve chamber from leaking to the outside from a breather chamber mounting surface between the breather chamber and the valve chamber. A breather chamber includes cylindrical drain passages communicating with a valve chamber, and tips of the drain passages exceed breather chamber mounting surfaces of a cylinder head and a head cover and protrude from opening parts toward a side of the valve chamber, so the oil separated from the blow-by gas in the breather chamber can be reliably discharged to the valve chamber and prevented from leaking to the outside from the breather chamber mounting surfaces.

Breather structure of engine

In an internal combustion engine, the cylinder block includes a first blowby gas passage and a first oil return passage. The cylinder head includes a second blowby gas passage connecting the first blowby gas passage with a connection passage connected with a gas-liquid separator, an oil return chamber separated from a valve operating chamber and the second blowby gas passage by first and second partition walls, respectively, and provided with a first oil return hole connected with the gas-liquid separator, and a second oil return passage connecting the valve operating chamber with the first oil return passage. The first partition wall is formed with a second oil return hole connecting the oil return chamber with the valve operating chamber. The second partition wall is formed with a ventilation hole connecting the oil return chamber with the second blowby gas passage at a higher position than the second oil return hole.

Internal combustion engine

Provided is a head cover structure of an engine, which is capable of increasing supporting rigidity of a head cover. The engine includes a driving force transmission mechanism for transmitting a driving force of a crankshaft to a valve train, in which on one end side in a cylinder row direction of the head cover, a bulging portion for covering an upper side of the driving force transmission mechanism is provided, and an engine mounting portion is attached to the bulging portion. The bulging portion is provided with an inclined surface portion having an inclined surface inclined downwardly toward the other end side in the cylinder row direction, and the inclined surface is formed to rise upwardly from an intermediate position in the cylinder row direction so as to be continuous with a top surface of the bulging portion on the one end side in the cylinder row direction.

Head cover structure of engine and suspension structure thereof

A variable valve actuation device includes a plurality of valve lifter. Each valve lifter slidable in a lifter support hole between an upper position and a lower position. A valve rest recess communicating with a valve rest chamber opens out at an outer circumferential surface of the valve lifter, and a valve rest supply port of a valve rest passage opens out at an inner circumferential surface of the lifter support hole in such a positional relationship that the valve rest passage and the valve rest chamber communicate with each other when the valve lifter is at the upper position, and continue to communicate with each other until the valve lifter has moved downward to a shut-off position located at a prescribed part of a down stroke from the upper position. The communication between the valve rest passage and the valve rest chamber shut off at the shut-off position.

Variable valve actuation device for internal combustion engine

An internal combustion engine includes: an engine body; an exhaust pipe fastened to the engine body; an engine body cooling water passage provided in the engine body and having a cooling water injection port and a cooling water discharge port; an exhaust pipe cooling water passage provided in the exhaust pipe; a supply passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that cooling water flows from the engine body cooling water passage to the exhaust pipe cooling water passage through the supply passage; and a return passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that the cooling water flows from the exhaust pipe cooling water passage to the engine body cooling water passage through the return passage.

Internal combustion engine provided with cooling water passage

A cooling structure of an internal combustion engine includes a cylinder block, an inner-block coolant passage, a cylinder head, and an inner-head coolant passage. In the cylinder block, cylinders are provided in a row in a cylinder row direction. The inner-head coolant passage is provided in the cylinder head and includes a main coolant passage, an upper exhaust side coolant passage, and a lower exhaust side coolant passage. The main coolant passage is provided above combustion chambers and extends in the cylinder row direction so that a coolant flows into the main coolant passage from the inner-block coolant passage at a first end side of the cylinder head in the cylinder row direction and so that the coolant flows out from the main coolant passage at a second end side of the cylinder head opposite to the first end side in the cylinder row direction.

Cooling structure of internal combustion engine

Provided is a V engine which uses common cylinder heads, and permits favorable arrangement of oil passages so as to accommodate various oil regulating features that are required to operate valve property varying mechanisms. Each end of each cylinder head is formed with a plurality of distribution oil passages opening out at an upper surface of the cylinder head for supplying oil pressure from a main gallery to a valve actuating mechanism. A pair of oil passage connecting members internally defining mutually different connecting oil passages are attached to the upper surfaces of the corresponding end parts of the respective cylinder heads.

V engine having valve property varying mechanism

Provided is a head cover structure of an engine, which is capable of increasing supporting rigidity of a head cover. The engine includes a driving force transmission mechanism for transmitting a driving force of a crankshaft to a valve train, in which the head cover includes a bulging portion for covering an upper side of the driving force transmission mechanism on one end side thereof in a cylinder row direction, and an engine mounting portion is attached to the bulging portion. The bulging portion is provided with an inclined surface portion having an inclined surface inclined downwardly toward the other end side in the cylinder row direction, and the inclined surface is formed to rise upwardly from an intermediate position in the cylinder row direction so as to be continuous with a top surface of the bulging portion on the one end side in the cylinder row direction.

An oil passage structure of a dry sump engine includes an oil recovery passage, at least one first communicating hole, and a first oil suction passage. The oil recovery passage extends in a direction in which a cylinder bank extends and is disposed so that at least part of the oil recovery passage is located outward of an external lower end portion of a valve gear chamber of a cylinder head along a junction between a side wall portion of the cylinder head and a bottom surface of the valve gear chamber in a state where the dry sump engine is mounted on a vehicle in an inclined manner. The at least one first communicating hole is provided in the side wall portion so as to connect the valve gear chamber of the cylinder head and the oil recovery passage.

Oil passage structure of dry sump engine and oil passage structure of V-shaped dry sump engine

A holding structure of an oil control valve includes an oil control valve, a cam holder, and a head cover. A valve portion is provided on a second end side of the oil control valve opposite to a first end side in a longitudinal direction. The valve portion is configured to switch oil passages by driving a solenoid portion and has a drain hole at a shaft end portion of the valve portion. The cam holder is attached to a cylinder head of an internal combustion engine and rotatably supports a camshaft of the internal combustion engine. A valve portion side of the oil control valve is embedded in the cam holder and supported by the cam holder. An axis of the oil control valve in the longitudinal direction is oriented towards the camshaft. The head cover is provided on an upper portion of the cylinder head.

Holding structure of oil control valve

A water-jacket structure, for a water-cooled internal combustion engine, forms a cylinder block water jacket in a cylinder block so as to surround cylinder bores formed in the cylinder block to make cooling water flow through the cylinder block water jacket into a cylinder head water jacket formed in a cylinder head joined to the cylinder block. An upper connecting opening is formed in an upper part of the cylinder block water jacket so as to open into the cylinder head water jacket. In the cylinder block is formed a lower connecting passage opening into a lower part of the cylinder block water jacket, extending upward, and connecting to the cylinder head water jacket.

Water-jacket structure for water-cooled internal combustion engine

An internal combustion engine with a breather apparatus, has: a cylinder head cover having a top wall and a circumferential wall which define an internal upper space within the cylinder head cover; and a bottom plate closing an opening at a lower end of the circumferential wall of the cylinder head cover to form a gas-liquid separation chamber. The bottom plate is inclined when the engine is set in a normal posture. A recessed portion for holding oil and serving as an oil return port is formed in a lowest portion along an edge portion of a lower side of a circumferential edge portion of the inclined bottom plate in such a manner as to straddle the circumferential wall from below. Thus, a lower end portion of the circumferential wall is brought into contact with oil held in the recessed portion to thereby close the oil return port airtightly.

Growing community of inventors

Wako, Japan

Yukio Konishi