Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Mahle Filter Systems Japan Corporation

Gp Daikyo Corporation

Yoshihiro Akiyama

Takeru Hamakawa

Atsushi Nakajima

Tsutomu Tsukii

Takeshi Fujii

Atsushi Yoshimura

Yoshiyuki Iida

Kuniyasu Tamura

Yoshihisa Kazui

Hisayuki Hashimoto

Shinichi Musha

Eiji Takahashi

Takeshi Wakamatsu

Toshiki Miyachi

Yutaka Miyahara

Ichirou Ohmura

Tetsuya Miyake

Takuma Adachi

Makoto Andou

Isao Emi

Takenori Akiyoshi

Masashi Maruyama

A cooling structure for an internal combustion engine includes a spacer. The spacer is fitted inside a water jacket which is formed to surround peripheries of a plurality of cylinder bores arranged one after another on a cylinder row line of a cylinder block of the internal combustion engine. A cooling condition of the cylinder bores is controlled by regulating a flow of cooling water in the water jacket by use of the spacer. A fixing member for fixing the spacer inside the water jacket is provided on an inner wall surface of the spacer facing the cylinder bores.

Cooling structure for internal combustion engine

A seal member () is disposed between a cylinder head cover () in which an ignition plug mounting hole () is formed and a plug tube () which is inserted in the ignition plug mounting hole (). The seal member () is provided with: a base section () configured to be elastically deformable and inserted into the ignition plug mounting hole (); a protrusion section () formed so as to protrude outward in the radial direction from the outer peripheral surface of the base section () and engaging with a groove () formed in the inner peripheral surface of the ignition plug mounting hole (); a seal lip section () in elastic contact with the outer peripheral surface of the plug tube (); and a grip section () formed between the base section () and the seal lip section () and protruding downward from the ignition plug mounting hole ().

Seal member, and plug tube seal structure for engine

A spacer arranged inside a water jacket which is formed to surround peripheries of cylinder bores in a cylinder block of an internal combustion engine includes support legs extending in an up-and-down direction from a spacer main body part which partitions the water jacket into an upper and lower cooling water passages. The support legs are disposed in opposite end portions in a cylinder row line direction, where the temperatures of the cylinder bores tend to be lower. Accordingly, even if the flow of cooling water is more or less inhibited by the support legs and the cooling effect deteriorates, it is possible to prevent the temperatures of the respective cylinder bores from becoming different by suppressing the influence to a minimum.

A spacer fitted inside a water jacket of a cylinder block in an internal combustion engine is set so that a space formed between an inner peripheral surface of the spacer and an inner wall surface of the water jacket is smaller than a space formed between an outer peripheral surface of the spacer and an outer wall surface of the water jacket. Accordingly, even if a position of the spacer is shifted in a radial direction, the inner peripheral surface of the spacer comes into abutment on the inner wall surface of the water jacket at first. Thereby, the abutment of the outer peripheral surface of the spacer on the outer wall surface of the water jacket is prevented completely. Therefore, hitting sounds of pistons can be blocked by the space between the outer peripheral surface of the spacer and the outer wall surface of the water jacket.

A part of a ceiling wall () of a head cover () that opposes an intake collection chamber () is constituted by a concave ceiling wall () that defines a concave surface facing the intake collection chamber (), and the concave ceiling wall () is formed with a recessed groove () that further recedes toward an inner side of the head cover.

Head cover of an internal combustion engine

An intake manifold M for an internal combustion engine has two or more structural members Pto Pincluding a first structural member Pintegrally provided with an inlet flangeto which a throttle deviceis connected, and an outlet flangeto be joined to a cylinder headprovided with intake ports. The first structural member Pis provided integrally with an inlet partforming at least part of an inlet passageand including the inlet flange. The outlet flangeis formed integrally with the inlet partso as to extend across a direction in which the inlet passageextends, two boltsandfor fastening the outlet flangeto the cylinder head are disposed respectively on the opposite sides of the inlet passage. The rigidity of the inlet flange and fastening of the outlet flange to the cylinder head by fastening means improves a vibration reducing effect on a throttle device joined to the inlet flange.

Intake manifold for internal combustion engine

A height of an upper end of an oil outflow prevention wallwith respect to the fastening planeis greater in a lower side of the inclination of the fastening planethan in a higher side of the inclination of the fastening plane

A first half part includes a second raised portion and a third raised portion respectively on the inner side of the hollow body and on the outer side of the hollow body with respect to a first raised portion, the second raised portion and the third raised portion being separated from the first raised portion with a spacing and being lower than the first raised portion. A second half part includes a third raised portion on the outer side of the hollow body with respect to a first raised portion, the third raised portion being separated from the first raised portion with a spacing and being lower than the first raised portion. An internal member includes a second raised portion on the inner side of the hollow body with respect to a first raised portion, the second raised portion being separated from the first raised portion with a spacing and being lower than the first raised portion. As a result, there is provided a high quality hollow body that can be provided at low cost and is cosmetically appealing.

Coupling structure for a hollow body

An intake manifold made of a synthetic resin includes a surge tank, and a plurality of intake pipes disposed in parallel to one another and each having a rising pipe portion which is connected to a lower portion of the surge tank and extends upwards. A space is defined between the surge tank and each of the rising pipe portions, as viewed sideways. In order to enable an increase in volume of the surge tank, while avoiding an increase in size of the intake manifold, the surge tank ( ) includes a main tank portion ( ) extending in a direction ( ) of arrangement of the intake pipes ( A to D) and opposed to the rising pipe portions ( A to D) of the intake pipes ( A to D), and a sideways-bulged portion ( ) which is bulged from an intermediate portion of the main tank portion ( ) as viewed in the arrangement direction ( ) and is interposed between a pair of rising pipe portions ( B, C) disposed at the intermediate portion as viewed in the arrangement direction . Inner ends of a pair of the spaces ( ) defined respectively between the rising pipe portions ( A to D) and the main tank portion ( ) on opposite sides of the sideways-bulged portion ( ) are closed by opposite sidewalls of the sideways-bulged portion ( ).

Intake manifold

A first pipe is press-fitted into a second pipe having an inner peripheral surface, circular in section, about an axis of the second pipe. The first pipe, having an outer peripheral surface provided with recesses each located between arcuate portions, and which recesses have the same radius about an axis of the first pipe and are located at a plurality of circumferentially spaced-apart points, The recesses are each located radially inwardly of a phantom circumferential extension of the arcuate portions to extend axially over a predetermined length of the first pipe. Thus, it is possible to relatively enlarge the press-fit margin leading to an elongation limit and to set the dimensional accuracy of the pipe product at a relatively low value by the fact that when the first pipe is press-fitted into the second pipe, the second pipe flows so as to fill a gap produced between the first and second pipes due to the plurality of recesses provided on the outer peripheral surface of the first pipe, as well as by the fact that the first pipe is easy to deform under compression at the recesses.

Growing community of inventors

Wako, Japan

Yoshihiro Akiyama