Nissan Motor Company Limited

Kazuki Arima

Hiroaki Hoshikawa

Takuya Taniguchi

The present invention provides a die assembly for molding a resin-made insert having a sleeve that is inserted into an intake port of an internal combustion engine. Each sleeve has one inlet and two outlets. The die assembly includes an inner die and an outer die. The inner die includes an inlet side part and an outlet side part. The inlet side part and the outlet side part mold an inner peripheral surface of the sleeve in an assembled state, and are removed in mutually opposite directions. By means of this assembly, a sleeve having a complicated structure and shape can be molded easily.

Die assembly for intake port insert

A bearing cap () fastened to a bulkhead () of a cylinder block () by bolts to support a crankshaft. A pair of protruding parts () that enlarge a joint surface () between the bearing cap () and the bulkhead () in a transverse direction of the crankshaft are formed respectively in a pair of side surfaces (). A pair of reinforcing parts () are positioned between a top surface () and the pair of protruding parts (), protrude from the pair of side surfaces () in the transverse direction of the crankshaft, and have a protrusion length that is smaller than that of the pair of protruding parts (). The stress on the joint portion between the bearing cap () and the bulkhead () generated by the crankshaft during operation of the internal combustion engine is thereby reduced.

Bearing cap and bearing cap assembly

A variable valve actuation mechanism for an internal combustion engine includes a drive shaft that rotates in operative association with rotation of a crankshaft, thereby to drive an intake or exhaust valve to open or close by way of a rocker arm; and a control shaft that is rotated by driving of a control shaft actuator and that causes variation of the position of the rocker arm, thereby to cause a lift characteristic of the intake or exhaust valve to be continuously variable. The control shaft includes a flange portion protruding from an outer circumferential surface of the control shaft to thereby regulate movement in an axial direction of the control shaft. A cylinder head rotatably supporting the control shaft includes a flange bearing portion that contacts the flange portion. The flange portion includes a stopper protrusion that protrudes from the flange portion and that contacts the flange bearing portion, thereby to regulate a rotation range of the control shaft.

Growing community of inventors

Yokohama, Japan

Kazuki Arima