Abstract: A liquid cooling jacket (J1) transmits heat generated by a CPU (101) which is installed at a predetermined position to coolant supplied from an external heat transmission fluid supply means and flowing inside of the liquid cooling jacket. The liquid cooling jacket includes a first flow passage (A1) on a side of the heat transmission fluid supply means, a second flow passage group (B1) including a plurality of second flow passages (B1a) branched from the first flow passage (A1), and a third flow passage (C1) installed at downstream side of the plurality of the second flow passages (B1a), and collecting the plurality of the second flow passages (B1a), wherein the CPU (101) mainly dissipates the heat to the second flow passage group (B1).

Abstract: The root shape of a flash formed in the friction-welded joint is controlled by introducing an upset delay time interposed between termination of the friction step and commencement of the upset step and by controlling the upset displacement speed. This provides a friction-welded joint having a tensile strength and a fatigue strength which are comparable with those of TIG- or MIG- welded joints and enables aluminum alloy hollow members to be produced by friction welding instead of TIG or MIG welding. Typically, the upset delay time is 0.4 to 0.8 sec and the upset displacement speed is 5.0 to 70.0 mn/sec to form a flash having a flash root radius of 0.5 mm or more and a flash root angle of 75.degree. or less.

Abstract: When aluminum members are arc welded at a welding speed of 2-7 minute, a quantity of input energy is remarkably reduced so as to form a welded joint free from deformation or strains. A weld bead with sufficient penetration is formed due to the high thermal conductivity of the aluminum material. The penetration is promoted by jagging the groove face. The heat balance between the aluminum members different in heat capacity from each other is stabilized by holding a jig having big heat capacity in contact with the aluminum member having smaller heat capacity, so that a good weld joint can be obtained regardless of the difference in heat capacity.

Abstract: The present invention relates to a T-shaped connection frame for connecting car frames, in which a first member is connected to a second member via a joint member to form a "T." The joint member is formed by symmetrically dividing a rectangular tube between its two latch teeth located at the upper-center and lower-center inner walls. The rectangular tube also has protrusions at the left and right exterior walls. The joint member divided in this way has the latch teeth at the upper and lower tips of the mouth formed by the division and has the protrusion situated opposite the mouth so that the first member can be snapped on easily to this mouth and the second member can be attached to the protrusion at the opposite side. This structural arrangement makes the positioning of the frames very simple, obviates a make-shift attachment, and, at the same time, reduces the number of operation steps.

Abstract: The propeller shaft arrangement which connects a transmission with a differential gear of a vehicle includes a first propeller shaft segment connected to the transmission at one end thereof and a second propeller shaft segment connected to the differential gear at one end thereof. The first and second propeller shaft segments are made of aluminum. The other end of the second propeller shaft segment is connected with one end of a steel center bearing via art universal joint. Serrations are formed at the other end of the center bearing and at the other end of the first propeller shaft segment such that the serrations of the center bearing are engaged with those of the first propeller shaft segment and a locking nut is screwed down over the engaging serrations to join the first propeller shaft segment with the center bearing.

Abstract: A process of production of alumina short fiber reinforced magnesium or magnesium alloy product features formation of alumina short fiber pre-form utilizing a inorganic binder which is composed of one or more oxides having thermodynamically stability equivalent to or higher than MgO. In the alternative, the composite almina fiber and binder surfaces of the alumina short fiber pre-form can be coated by a baked coating layer. Pressure casting of molten magnesium or magnesium alloy is then performed for forming the final products.

Abstract: A composite material having heat resistance at elevated temperatures and excellent mechanical properties to be used for parts of automotive vehicles, especially for pistons, machine parts or aerospace materials is composed of fiber reinforced magnesium alloy as a matrix having a composition of magnesium alloy containing up to 2 to 15 wt %, but preferably 4 to 7 wt % of neodymium or corresponding amount of neodymium-type metals, for example, didymium containing at least 70 wt % of neodymium. The composite material is composed of 70 to 95 vol % of the matrix and 30 to 5 vol % of short alumina fibers as the reinforcement.

Abstract: A method of producing a fiber reinforced metal composition is characterized by a unique and successful pressure exerting program for consolidating a fiber assembly fabricated into a desired configuration and a molten metal matrix. The program is generally constituted a first step in which relatively low pressure is exerted on the molten metal for consolidation of the fiber assembly and the molten metal and a second step in which pressure is instantly increased to a maximum pressure for solidification of the metal matrix.