Abstract:
The invention relates to a CO2 compressor with a housing (3) and with a housing support (5) which is characterized in that the housing support (5) is configured as a separate component and is mounted on the housing (3) so as to have a directional rigidity.
Abstract:
A piston (16) is provided for use in a free-piston engine (10) and includes a crown portion (48) having a predetermined thickness, a plunger connection portion (50) having a passage (66) extending therethrough along the axis of the piston (16) and being connected to the crown portion (48), a sealing portion (52) extending from the crown portion (48), and a strut portion (56) having a plurality of struts (86) disposed between the sealing portion (52) and the plunger connection portion (55). The piston (16) of the subject invention provides a compact, high strength, low weight design that is effective in use to provide efficient operation and effectively conduct heat from the piston (16) during use.
Abstract:
The invention relates to a piston (1) with a central cooling chamber (7). Said cooling chamber is located beneath the piston head and is impinged upon by oil. At least the lower wall of the cooling chamber (7) is formed by a plate (9). The aim of the invention is to provide a means of fixing the plate (9) to the piston (1) as easily as possible. To this end, the piston (1) has at least one second pin or clamping sleeve situated above the piston pin (14). Said second piston pin or clamping sleeve (13) has a smaller diameter, extends approximately in the direction of the piston pin axis and is connected to the piston (1). The plate (9) which forms the lower wall of the cooling chamber (7) is supported against the second piston pin or clamping sleeve.
Abstract:
The invention concerns a built-up piston (1) with an upper part (2) made of an iron material and a lower part (3) made of an aluminium alloy. The object of the invention is to increase the loading capacity of the bosses. To that end, the lower part (3) comprises cast-iron or steel gudgeon pin bosses (4) which are screwed at least to the lower part (3).
Abstract:
An economical resistant bearing surface reinforcement is to be provided for a reciprocating piston of an internal combustion engine, especially one using an aluminium alloy as the basic material, especially one such designed for an engine with cylinder running surface of alluminium alloy. To this end, the prior art galvanically applied steel, nickel or chromium coatings are to be replaced by a synthetic-resin-bonded graphite coating with incorporated metal particles. The metal particles may be nickel, steel, bronze, chromium, silver or alloys thereof. The running layer may also be a thin, adhesively secured metal foil. As a further alternative, the bearing layer may also be formed by metal plates secured to the piston body mechanically or by casting.
Abstract:
A piston (10) containing a cavity (16) is manufactured by forming a box (20; 50; 70; 80). The interior of the box defines the cavity (16). The box is mounted in a die cavity (26) and the piston is cast around the box. The box is provided with projections (22c; 24c; 52; 58; 73) which enter recesses in the wall of the die cavity and support the box. After removing the piston from the die cavity, the projections are machined off.
Abstract:
The invention concerns a piston for a four-stroke internal-combustion engine, in particular the engine of a motor vehicle, the piston having a front face (2) and a piston skirt (3) contiguous with the front face (2). The invention calls for only one annular groove (4) to be made in the piston skirt (3) to hold only one piston ring (5).
Abstract:
A vane made of sintered iron alloy containing uniformly dispersed hard carbides and comprising an iron-based matrix. The alloy consists of 0.7 - 1.5 wt% of C, 3.0 - 5.0 wt% of Cr, 0 - 10.0 wt% of Mo, 1 -20.0 wt% of W, 0.5 - 6.0 wt% of V, 0 - 15.0 wt% of Co and the balance of Fe and unavoidable impurities, and has a grain diameter of the hard carbide of up to 5 νm, the total theoretical density ratio of 80 ∩ 90 %, and a macro-hardness of 10 - 45 in terms of the Rockwell C scale by shaping the composition at a pressure of 5 - 8 tons/cm2 and sintering it below 1,250 °C.
Abstract:
Internal combustion engine of the piston type for a motor vehicle, powered by a separate compressed air supply which is injected into each cylinder after having being heated by the exhaust gases. The invention relates to heat exchange and gas distribution means, its connection to the cylinders and the new configuration of the chamber and of the pistons. It is comprised of a frustroconical rotating distributor (15) pushed against a bore (5), having the sameconicity, by the pressure of the air on the intake pipe (18), and linked to each cylinder by a gas-transfer pipe (6). Heat exchange take place in three steps: first, preheating in the cells (7) of the timing case (3), then in the fixed exchanger (8) and finally in a rotating heat exchanger (16) arranged between the rotor (15) and the intake pipe (18). The accelerator pedal controls the air intake by means of a valve (10) and varies the volume injected by means of the angular offset of the rotor (15) with respect to the crankshaft. Fuel injection is regulated so that the temperature of the burnt gases is optimal.
Abstract:
A piston assembly comprising a piston head, and a connecting rod one end of which is secured to the piston head so as to be pivoted relative to the piston head about a predetermined axis. The end of the connecting rod supports a cross-member opposite ends of which are received in respective recesses defined in the piston head. The recesses define arcuate bearing surfaces which are contacted by corresponding arcuate bearing surfaces defined by the cross-member. The piston head is formed from at least two components and each recess is defined by a respective one of the components. The components are permanently secured together after insertion of the cross-member into the recesses such that subsequent separation of the piston head and connecting rod is prevented. The piston assembly may support helical sealing rings.