Abstract:
Improvements in the construction of skis, sleigh runners and the like having extended and improved wear characteristics. In one form a ski is fabricated with lower left and right edging thereof which is subject to wear and dulling during use by frictional attrition defined by a hard synthetic material having the hardness in the range of natural diamond or higher. The hard material may comprise a coating of synthetic diamond formed in situ on a flexible strip of metal or ceramic material by chemical vapor deposition, radiation beam deposition or other means such as lamination sintering. While a single elongated sheet or strip of metal which is entirely or partly coated with a thin layer or film of synthetic diamond may form the bottom layer or lamination of the ski, a plurality of narrower strips of such diamond coated metal may respectively define the lower left and right edge portions of the ski along most of the length of the ski or at least that portion thereof which is subject to frictional attrition during turning movements when skiing. In a particular form of the invention, a metal such as chromium is provided against the synthetic diamond material to protect its outer surface and to serve as a dry lubricant.
Abstract:
A low-friction piston construction for use in an oil-fed cylinder bore with the piston skirt relieved to define lands that are coated with SFL (graphite, MoS.sub.2, BN, and a special expoxy resin). A method of making such piston construction including provision of asperities on the skirt wall onto which the SFL coating is thermally sprayed and formation of small pockets at the mouth of the asperities to additionally act as oil replenishing reservoirs. A method of using such piston construction in an engine which comprises provisions of a slightly increased gap between the piston and cylinder wall and formation of a transferred SFL coating from the piston to the cylinder wall resulting in two polished microsmooth mating coatings, each attractive to oil films.
Abstract:
A four valve, double overhead camshaft diesel engine (10) has a precombustion chamber (30) with an angled and tapered transfer passage (60) leading to the main combustion chamber (44). The transfer passage (60) is tapered to provide a larger lower end (62) facing the main chamber (44) and smaller upper end (64) facing the pre-combustion chamber (30). The pre-combustion chamber is spherical, located on one side of the main combustion chamber. Air passing through the passage (60) during the compression stroke undergoes heating and swirling within the pre-combustion chamber. The piston has a domed upper surface with recessed lobes (20) and (22). Each recessed lobe functions as a valve pocket for the intake and exhaust valves (32) and (42).
Abstract:
A cooled piston head and method of manufacture, the piston head having a closed cooling chamber. In one embodiment, the piston head is formed of a top member, an intermediate member and a pin boss member joined to each other preferably by welding; the top and intermediate members are provided with circumferential grooves which defines the closed cooling chamber. In an alternate embodiment, the head is formed of a top member and a pin boss member joined together preferably by welding; the closed cooling chamber is defined by circumferential grooves provided on both members.
Abstract:
Improvements in ice skates, particularly ice skate blades which are protected against wear and dulling during use. In one form, a thin film of hard synthetic diamond or diamond-like material is formed in situ against the lower portion of an ice skate blade including the bottom surface thereof and portions of the side walls of the blade so as to define the left and right edges of the blade of a hard material which is resistant to erosion and wear. In another form, the entire blade of an ice skate is coated with such hard diamond material formed from atoms of carbon deposited from a fluid containing hydrocarbon molecules, such as methane gas through which high energy radiation, such as microwave radiation, is beamed against the blade. In a third form, the entire blade runner and the metal support for the blade are coated with a hard synthetic diamond or diamond-like material. In yet another form, the diamond or diamond-like material coated on the blade or select portion thereof, is overcoated with a thin layer of a protecting material, such as chromium or a chromium alloy, which protects the outer surface of the synthetic diamond material from surface erosion and abrasion.
Abstract:
A method of forming a composite piston assembly for an automotive air conditioning compressor includes providing 1018 steel alloy, solid connecting rod with an aluminum alloy head. An axial receiving bore is provided in the piston head, which is also fabricated of solid bar stock, and includes a frusto-conically-shaped counterbore. The connecting rod includes a positioning collar that defines a tenon received in said bore. A cold swaged tip of the connecting rod flares outward so as to conform to and fill the counterbore and provide a strong fixed attachment joint between the connecting rod and piston head.
Abstract:
A method to manufacture an articulated piston head wherein the two portions composing the head, i.e. the top portion and the pin boss portion, are formed separately from blanks of forged or cast chromium-molybdenum steel or a low alloy steel, subjected to preliminary machining operations, joined together by friction welding and then machined to final dimensions.
Abstract:
A ceramic-metal friction welded member includes a ceramic member formed with an annular notch in an outer circumference of its surface and a metal member joined onto the annular notch of the ceramic member by friction welding. A ceramic cast-in bonded piston includes a crown made of a ceramic material having an annular notch formed in an outer circumference of its surface, a metal annular member joined onto the annular notch of the crown by friction welding, and a piston main body made of an aluminum alloy surrounding the crown by cast-in bonding. A ceramic cast-in bonded piston includes a crown made of a ceramic material, a piston main body made of an aluminum alloy surrounding the crown by cast-in bonding, and an annular member made of a metal different from aluminum and joined by friction welding to an outer circumference of a surface of the crown in contact with the piston main body.
Abstract:
A piston assembly for use in a piston cylinder of an engine is disclosed. The piston assembly includes a piston rod which connects the piston assembly to a crankshaft. The piston rod has a pin receiving opening at an upper end. A piston head having a transverse bore is connected to the piston rod. A piston pin is disposed through the pin receiving opening of the piston rod and the transverse bore of the piston head. The piston pin connects the piston head to the piston rod and has an axial bore. A piston skirt is connected to the piston head. The piston skirt has a transverse bore and an oil reservoir formed in the upper surface. At least one piston skirt pin is disposed through the piston pin axial bore and the transverse bore of the piston skirt to connect the piston skirt to the piston pin. This connects the piston skirt to the piston head. A fastening device secures the piston skirt pin in position within the piston skirt and the piston pin. The distance between the top surface of the piston and the center line of the piston pin may be made shorter than the equivalent distance in a conventional piston head-piston skirt-piston pin assembly. Additionally, the weight of the piston assembly is less than the weight of a conventional piston head-piston skirt-piston pin assembly made from identical materials.
Abstract:
A structural member made of titanium or titanium alloy has a metal structure at its surface layer portion formed of a plurality of kinds of .beta.-phases of different characteristics which are present in combination.