Abstract:
PURPOSE:To provide a light structure for achieving highly rigid crankshaft supporting portions, by fitting a bearing cap made of an iron alloy to each of a plurality of journal walls formed in a crankcase in a unitary manner, and fastening a bridge member to the lower surface of the bearing cap. CONSTITUTION:A cylinder block of a V-type multi-cylinder internal combustion engine is composed of two cylinders 11, 12 disposed in the formed of a V-shape and a crankcase 2 for connecting the lower portions of said two cylinders 11, 12 in a unitary manner. In the crankcase 2, a plurality of journal walls 7 are formed with proper intervals to each cylinder to extend in the direction of a crankshaft Sc. In such an arrangement, a recess is formed centrally of the lower surface of each journal wall 7, and a bearing cap 11 is inserted into each of said recesses and then fastened securely in place by means of bolts 15 to support the crankshaft Sc between two bearing halves 8, 9 of the journal walls 7 and the bearing caps 11. Further, a bridge member 17 formed with a main galley 17 for oil passages is disposed under the lower surfaces of the bearing caps 11 and fastened to the same by bolts 16.
Abstract:
PURPOSE:To improve juncture strength, by a method wherein a wall member, mounted to the head part of a piston body, is formed by a metallic porous material, cast in the piston body filled with an aluminum alloy, and a compound layer of the metal of a metallic porous material and aluminum. CONSTITUTION:The inner wall of a combustion chamber 4 in a head part 3 of a piston 1 and the upper surface of the piston around the combustion chamber 4 are formed by a wall member 7, and a piston body except the wall member 7 is formed by an aluminum alloy. The wall member 7 is cast in a piston body 2 in a condition that, in a metallic porous material 8, consisting of a nickel series alloy, a copper series alloy, or a cast iron series metal, the pores thereof are filled with the aluminum alloy of a piston body 2. At the boundary between the metallic porous material 8 and an aluminum alloy 9, a compound layer 10 of aluminum having a volume rate of 1-80% and a metal of the metallic porous material 8 is formed.
Abstract:
A slide member of the present invention is used in a slide unit which is included in a refrigerant compressor for compressing a refrigerant and provided inside a sealed container which reserves lubricating oil therein. The slide member is provided with an oxide coating film on a surface of a base material. The oxide coating film is configured such that (1) when the base material comprises an iron based material, the oxide coating film has a three-layer structure including a first layer comprising Fe 2 O 3 , a second layer comprising Fe 3 O 4 , and a third layer comprising FeO in this order from an outermost surface, (2) the oxide coating film has a dense structure having minute concave/convex portions with a height difference which falls within a range of 0.01µm to 0.1 µm, or (3) when the base material comprises the iron based material, the oxide coating film has a three-layer structure in which the three layers comprise the iron oxides and are different in hardness.
Abstract:
A swash plate 3 includes an substrate 11 made of an iron-based material, a hard first resin layer 12 provided to coat an end surface of the substrate 11, and a soft second resin layer 13 provided to coat the first resin layer 12. A spiral annular groove 12A is formed in a surface of the first resin layer 12, and the second resin layer 13 is provided to match a sectional shape of the first resin layer 12. With the soft second resin layer 13 on a sliding surface 3A of the swash plate 3, the swash plate 3 having a good fit in an initial stage of sliding can be provided. When the second resin layer 13 partially wears, a protrusion 12 of the first resin layer 12 of hard resin is exposed, and thus the swash plate 3 having good wear resistance can be provided. The swash plate 3 having good sliding properties can be provided.
Abstract:
The invention relates to a method for applying electro-deposited metal coatings (3) upon aluminium or aluminium alloy components (1). According to said method, the surface (4) of the component is cleaned in an appropriate solution, in particular a solution of oils, fats, emulsions, pigments, etc. Said surface (4) is then etched in an appropriate solution, such that a certain quantity of material or near-surface alloy constituents is dissolved. After cleaning and dissolution, water rinsing is carried out. Immediately after the dissolution of the near-surface regions, the surface (4) of said component (1) is activated in a solution, containing iron ions, with a sulphate base by the anodic coupling of said component (1). The functional layer (3) is then applied by the cathodic coupling of said component (1), without intermediate rinsing, in the same electrolyte or in a similar or equivalent electrolyte, said functional layer (3) being made of iron (5).
Abstract:
A main bearing cap (A') made of powder metal has a body portion (Y) made from one powder metal material (Q), and a bearing arch portion (H), foot joint face portions (S) and/or wings (W) made of a different powder metal material (P). The material (Q) of the body portion (Y) is harder than the material (P) of the other portions (H, S, W), and the material (P) of the other portions (H, S, W) is relatively machinable. For the bearing arch portion (H), the machinability of the material (P) approximately matches the machinability of the bearing support structure (B) to which the bearing cap (A') is assembled to produce a good quality bore and longer tool life during line boring. The bearing arch material (P) may be a bearing material.
Abstract:
The invention relates to a crankcase which is made of light metal and which is provided for an internal combustion engine. Said crankcase comprises a separating surface (4) which passes through the crankshaft axis and which is arranged between an upper part of the case and a lower part of the case. The support walls (2) of the crankcase which connect the outer walls (1) of the case comprise inserts (3) made of a ferrous material. The bearing shells of the crankshaft bearing and the bearing screws (7) provided on both sides of the bearing shells are mounted in said inserts. In order to create advantageous structural relationships, the invention provides that the support walls (2) which construct a continuous light metal bridge between the outer walls (1) of the case accommodate the inserts (3) which are lower than the support walls (2) in recesses (8), said recesses starting from the separating surface (4). In addition, said support walls are provided with passage openings (9) for the screw heads (10) in the vicinity of the bearing screws (7).