Honda Motor Co., Ltd.

Koichiro Asame

Osamu Yoda

Motoyuki Sunaoka

Atsushi Suenaga

Yuusuke Wada

Takuya Ono

Tadashi Kanamori

Provided is a belt cover of an internal combustion engine having ease of attachment and detachment and sealability. A belt cover structure for an internal combustion engine includes an oil pump case OP and a lower coverthat cover a timing belt TB, and a side mount bracketthat is adjacent to an upper side of the lower coverand is held by a cylinder block CB. Mating surfacesandthat are aligned with each other are respectively formed on the lower coverand the side mount bracket. A lower seal memberis disposed on the mating surface, and the mating surfaceis configured to cover the mating surfacefrom the outside. The lower coverand the side mount bracketare fixed in a state where the mating surfaceof the side mount bracketis pressed against the mating surfaceof the lower covervia the seal member

Belt cover structure for internal combustion engine

Provided is a seal structure of a belt cover for an internal combustion engine having excellent sealability on the composite mating surfaces of an upper cover, a lower cover, and an inside cover constituting the belt cover. The seal structure of the belt cover for the internal combustion engine according to the present invention includes: an inside cover member disposed on a side of the body of the internal combustion engine; and an outside cover member disposed on a side opposite to the body of the internal combustion engine, and accommodating a timing belt TB in a liquid-tight state together with the inside cover member. The outside cover member is divided into an upper outside coverand a lower outside cover. A first seal is formed between the upper outside coverand the inside cover member. A second seal is formed between the upper outside coverand the lower outside cover. At a boundary between the first seal and the second seal, a seating portionon which a lower endof a seal memberof the first seal is seated is formed by an end upper surface of a male portionof the lower outside coverand an end upper surface of a projecting portionof the inside cover member flush with the end upper surface of the male portion

Seal structure of belt cover for internal combustion engine

Provided is a seal structure and a mounting method of a belt cover for an internal combustion engine, the belt cover ensuring good sealability, minimizing detachment and attachment of peripheral pipe and the like when the belt cover is detached and attached, and having excellent maintainability by allowing detachment and attachment of only a necessary cover member. The belt cover includes an inner cover member (, CH) and an outer cover member on both sides of a timing belt TB, and the outer cover member is divided into upper and lower outer covers () and (). Sealing in a cylinder bore row direction with respect to the upper outer cover is formed by a first seal member () accommodated in a mating surface of the inner cover member, and sealing in a cylinder axis direction with respect to the upper outer cover is formed by a second seal member () accommodated in a lower mating surface of the lower outer cover. A predetermined gap is formed between the inner cover member and another component (), and a plurality of protrusionsandfor locking the upper outer cover are provided on the lower mating surface of the lower outer cover.

Seal structure and mounting method of belt cover for internal combustion engine

A belt cover for an internal combustion engine is provided, and the belt cover efficiently discharges water from a drain hole and has good sealing performance. A water pump, which is disposed on one side surface of a cylinder block CB, and which includes a drain hole, an oil pump case OP, which covers the inside of a timing belt TB, and a lower cover, which covers the outside of the timing belt TB are included. The oil pump case OP and the lower coverare fixed with each other through a seal member, and constitute a lower case. A guide riband a discharge portare formed inside the lower case, the guide ribbeing for guiding drained water from the drain hole, while separating from the timing belt TB, the discharge portbeing for discharging the drained water from the lower caseat a bottom end of the lower case, and the drained water from the drain holeis guided by the guide ribtoward the discharge port

A baffle plate includes a curved part which in turn includes a bottom portion (), an upstream inclined portion (), and a downstream inclined portion (). A part of the downstream inclined portion adjacent to the bottom portion is provided with a first downstream through hole () elongated in the axial direction of the crankshaft, and a downstream side wall () extending from a downstream edge of the first downstream through hole in an upstream direction with respect to the rotational direction of the crankshaft, and a part of the downstream inclined portion remote from the bottom portion is provided with a plurality of second downstream through holes ().

Baffle plate for oil pan

A pair of bracket fastening parts () are provided on a side of the main body in an adjoining relationship, each bracket fastening part including a plurality of bosses (totototo) arranged in a convex polygonal pattern and a plurality of ribs (totototo) connecting the bosses in a prescribed pattern. At least two of the bosses of one of the bracket fastening parts are shared by an adjoining one of the bracket fastening parts. Thereby, the engine can be adapted for multiple applications while minimizing an increase in the weight of the engine.

Internal combustion engine

A cylinder headfor a multiple-cylinder internal combustion engine is provided with a centralized exhaust passageway E. The centralized exhaust passageway E includes individual exhaust passagewaystoconnected to combustion chambers defined by recessesto, and a central passagewaycollecting the exhaust gas flowing through the individual exhaust passagewaysto. Each of the exhaust passagewaystohas two branch passagewaysextending from the exhaust ports Ea opened and closed by exhaust valves, and a merging passagewayhaving one end connected to the two branch passageways. The respective passage diameters Dto Dof the merging passagewaystoare substantially equal to the passage diameters dto dof the branch passageways. The merging passagewaystoand the central collecting passagewayare surrounded with water jackets Wand Wfrom above and below. Thus exhaust gas cooling efficiency can be improved without enlarging the cylinder head provided with the centralized exhaust passage.

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Wako, Japan

Koichiro Asame