Abstract: A stamped, steel insert for use in metal die cast articles. The insert includes first and second interconnected stamped steel insert halves spaced from one another at certain locations to define a void. Openings communicating with the void extend through each insert half to facilitate material flow and to improve interlock of the insert and die cast material. The edges of the insert lie below the surface of the casting to avoid bimetallic machining. The insert halves cooperate to define a pair of elongated passages, which are bored following die casting to form fastener holes. At least one of the passages has an elongated cross section to allow for expansion and contraction of the insert during casting.

Abstract: An air passage insert for an oil fill spout disposed on a side of an oil crankcase which includes an air communication passageway having a first end thereof disposed within an interior portion of such oil crankcase at a position above an oil full level and a second end thereof being in communication with atmosphere for communicating air from such interior portion of such oil crankcase in a space located above such oil full level. There is an further provided an attachment device which is engageable with both such air communication passageway and such oil fill spout for attaching the air communication passageway at least to one of such oil fill spout and such interior portion of such oil crankcase thereby enabling air to be vented from such space located above such oil fill level during an oil filling process.

Abstract: This invention relates to a mounting structure of a multiple piston ring for various internal combustion engines. A plurality of piston rings are all wrapped in a cylindrical groove formed upon an outer surface of a piston so that a gap of one piston ring cannot face to a gap of the other piston ring, namely respective gaps of the plurality of piston rings are spaced each other with a certain distance. In order to prevent such a facing of two or more gaps that may occur due to a rotation of the piston rings, a stop pin is mounted on a piston wall so as to engage with a gap of one piston ring or formed as a convex protrusion on one piston ring so as to engage with a gap of the other piston ring. Since respective gaps of the piston rings are not faced to each other, it is possible to prevent any back pressure gas leakage from such gaps of the piston rings.

Abstract: A transmission includes a housing having the interior thereof connected for fluid communication with a vacuum source, such as an engine manifold. A check valve and regulator valve are disposed between the transmission housing and the vacuum source. The check valve prevents fluid flow from the vacuum source to the transmission while the regulator valve limits the maximum vacuum that can be drawn in the transmission housing. The normal transmission fill tube opening has installed therein a filter for restricting fluid flow to the interior of the housing or a cap for preventing fluid flow through the fill tube during normal operation.

Abstract: An underwater pump which comprises an engine received in liquidtightness in a capsule, and wherein the suction pipe and exhaust pipe of the engine are each open at one end on the surface of the wafer. The exhaust pipe is cooled by the surrounding water. A water-collecting chamber is formed at the lower end of the exhaust pipe to collect water drops deposited on the inner wall surface of the exhaust pipe, the collected water being drawn off to the outside. A connection pipe provided with a flow control valve communicates with a discharge water hose. Air remaining in an impeller casing or part of the discharge water pressurized by the impellers is carried into the discharge water hose through the connection pipe. Engine-cooling water is held in a water tank shut off from the surrounding discharge water. The engine-cooling water brought pack through a return path from the engine capsule is cooled by discharge water drawn into the underwater pump.

Abstract: The cylinders of a supercharged two-stroke internal combustion engine have valves, intake and exhaust pipes and a cylinder head constructed for air to be directed from the intake pipe toward the piston along the wall of the cylinders upon opening of the valves and to scavenge the combustion chamber without substantial direct flow of air from the intake pipe to the exhaust pipe along the cylinder head.

Abstract: An internal combustion engine comprises a cylinder having a horizontal axis, one end of the cylinder being formed as a combustion chamber and the other end opening into a crankcase receiving a lubricating atmosphere. A piston slidable in the cylinder has a space therein communicating with the crankcase. The piston is formed with grooves of rectangular cross-section with a base and a pair of transverse surfaces. A scraper groove furthest from the combustion chamber receives a scraper ring and has orifices in its base communicating with the piston space, the other sealing grooves receiving piston rings, annular gaps between the piston and cylinder being left on each side of the piston and scraper rings. The annular gaps are placed in continuous communication with the groove bases by at least one recess on each transverse surface of a sealing groove and by at least one recess on that transverse surface of the scraper groove which is nearest the combustion chamber.