Abstract: Provided is a method for manufacturing a knuckle that includes a bearing mounting portion on which a hub bearing is mounted, a damper holding portion which holds a damper, and a damper mounting arm portion which couples the bearing mounting portion and the damper holding portion, the method being such that by using one core, the knuckle is integrally casted so as to formed therein a cylindrical opening which is the inner space of the damper holding portion, a hollow opening in which the inner space in a hollow portion of the damper mounting arm portion, the hollow portion extending in a closed cross section from the damper holding portion, is continuous with an opening formed in the damper holding portion, and an arm-portion opening which is surrounded by a front arm portion and a rear arm portion of the damper mounting arm portion, extending from the hollow portion.

Abstract: A method of fabricating a two-component blade for a gas turbine engine, the method including in succession: obtaining a blade profile made of ceramic material having a hole passing right through the blade profile in its length direction so as to form a longitudinal channel opening out into a top cavity; positioning and maintaining the blade profile in a mold so as to form a bottom cavity communicating with the channel of the blade profile; casting molten metal into the blade profile so as to fill the top and bottom cavities and the channel interconnecting them; and cooling the metal so that the shrinkage of the metal cooled in the top and bottom cavities leads to the ceramic of the blade profile being subjected to compression prestress.

Abstract: A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors.

Abstract: A component casting apparatus includes a mold to receive a molten solid for casting a component. The mold includes a first sacrificial layer to define a housing of the component and a second sacrificial layer to form at least one core passage of the component in response to contact from the molten solid. The component casting apparatus further includes a trusset disposed against an outer surface of the second sacrificial layer and formed from metal to support the second sacrificial layer.

Abstract: A mold for manufacturing a composite drive shaft, most of which, except for opposite ends functioning as power transmission parts, has a tubular shape with a circular cross-section similar to that of a general shaft, and the shape of each end of which is changed so as to realize easy removal of the drive shaft from the mold after molding. Further, the present invention provides a composite drive shaft, which is manufactured using the mold and is configured such that, when a connection joint (metal yoke) is assembled with each end of the drive shaft, the drive shaft can be rotated in an integrated state realized by the connection joints. Thus, the composite drive shaft of the present invention can directly transmit power, instead of a mechanical fastening jointing technique or an adhesive bonding jointing technique, thus efficiently transmitting high torque.

Abstract: To form a mold for casting a metal article, metal pins are inserted through a pattern. End portions of the metal pins are bent after the pins have been inserted through the pattern. The pattern and opposite end portions of the metal pins are then covered with wet ceramic mold material. A mold structure is formed by drying the wet ceramic mold material. The pattern is then removed from the mold structure to leave a mold cavity with the metal pins extending through the metal cavity between opposite side sections of the mold structure. Molten metal is conducted into the mold cavity and force is transmitted between opposite side sections of the mold structure through the metal pins to retard movement between the side sections of the mold structure. The molten metal is solidified in the mold cavity and a metallurgical bond is formed between the metal in the mold cavity and the metal pins. The cast article is then removed from the mold structure. The cast article has a thin wall section with a thickness of 0.

Abstract: A closed mold for a cylinder head is provided having two widely spaced wall portions, at least one of the widely spaced wall portions being in communication with the atmosphere through an opening in the closed mold. The widely spaced wall portions define the ends of a long open cavity within the mold and provide core supporting portions for a long, narrow core element adapted to form an elongated, narrow open cavity within the casting. A narrow core element is provided between the core supporting portions of the widely spaced wall portions of the mold without intervening support. The long narrow core element comprises an outer portion of casting sand adapted to form the walls of the elongated, narrow open cavity of the casting extending between the core supporting portions. The narrow core element further comprises an inner portion for supporting the long, narrow core element and for providing a gas passage extending to the one wall portion.

Abstract: An evaporative pattern assembly for use in sand casting and comprising a pattern fabricated from evaporative material and including portions forming a cavity, and a member for preventing distortion of the pattern during aging and during sand compaction around the pattern and in the cavity. The distortion preventing member is fabricated from nonevaporative material, extends between the portions of the pattern, and only partially fills the cavity so that sand can flow around the distortion preventing member.

Abstract: A mold producing one or more globe-shaped bells, each of which is cast as a one-piece shell enclosing a tumbling ball-bearing or jinglet. Production of the one-piece shell is made possible by pouring molten metal over a spherical core, supported by small "feet" inside the globe-like cavity of the mold. When the shell is removed from the mold, the core, in which the ball-bearing or jinglet is embedded, can easily be broken down into particles which fall out holes in the shell's surface.

Abstract: In the manufacture of hollow cast articles such as turbine blades or vanes, the article is cast in opposed halves on opposite sides of a "strong back" or mid-section, to which wax patterns are attached for the preparation of a shell mold around the strong back and patterns. The article halves, after removal from the mold, are bonded together.