134results about How to "Improved seizure resistance" patented technology

A sliding structure for an automotive engine includes a sliding member with a sliding portion and a lubricant applied to the sliding portion so that the sliding portion can make sliding contact with a counterpart member via the lubricant. The sliding member is either of a piston ring, a piston pin, a cam lobe, a cam journal, a plain bearing, a rotary vane and a timing chain. The sliding portion has a base made of a steel or aluminum material and a hard carbon film formed on the base to coat the sliding portion. The hard carbon film has a thickness of 0.3 to 2.0 μm, a Knoop hardness of 1500 to 4500 kg / mm2, a surface roughness Ry (μm) satisfying the following equation: Ry<{(0.75−Hk / 8000)×h+0.07 / 0.8}, where h is the thickness (μm) of the film; and Hk is the Knoop hardness (kg / mm2) of the film.

A sliding bearing having improved seizure resistance has the following structure.(a) A bearing layer (2). It comprises a copper alloy containing in a Cu matrix Ag, Sn, Sb, In, Mn, Fe, Bi, Zn, Ni and / or Cr.(b) A fisrst sub-layer (3) of the bearing layer (2). It (3) contains concentrated element, hexagonal compound or eutectic of said element(s).(c) A second sub-layer (2a) in which said element in essential solid-solution state.(d) Metal backing (1).

A sliding structure for an automotive engine includes a sliding member with a sliding portion and a lubricant applied to the sliding portion so that the sliding portion can make sliding contact with a counterpart member via the lubricant. The sliding member is either of a piston ring, a piston pin, a cam lobe, a cam journal, a plain bearing, a rotary vane and a timing chain. The sliding portion has a base made of a steel or aluminum material and a hard carbon film formed on the base to coat the sliding portion. The hard carbon film has a thickness of 0.3 to 2.0 μm, a Knoop hardness of 1500 to 4500 kg / mm2, a surface roughness Ry (μm) satisfying the following equation: Ry<{(0.75−Hk / 8000)×h+0.07 / 0.8}, where h is the thickness (μm) of the film; and Hk is the Knoop hardness (kg / mm2) of the film.

A sliding bearing for an internal combustion engine including a copper-based bearing alloy including silver and tin upon which an overlay is applied. The overlay comprises resin and MoS2, and the adherence of the overlay to the alloy is enhanced by a roughened alloy surface formed of grooves extending in the sliding direction.

A cylindrical roller bearing includes an inner ring having a flange portion provided with a roller guide-surface which guides the end faces 4a of the cylindrical rollers having diameter of Da. The end face 4a away from a center axis of the cylindrical roller by 0.40 Da in the radial direction is a first position A, and the end face 4a away from the center axis by 0.35 Da is a second position B, the end face 4a contacts with the roller guide-surface between the first and second positions A and B, the end face 4a has a convex-shaped crowning portion 4b having a continuous curve which passes the first and second positions A and B, and an angle α formed between a line connecting the first and second positions A and B and a line perpendicular to the center axis is set to be 0.5° or less.

A high-speed self-lubricating oilness bearing is made from powder metallurgy material. The powder metallurgy material is constituted by the following weight percentage of P: 0.5-0.7%, MoS 2: 2-3%, graphite: 0.5-1% and the residual is 663 bronze powders. A process for the preparation of the bearing comprises putting raw powders weighted according to the composition into a ball mill barrel with 2 liters, ball milling raw powders 2h on a roller-type ball mill, pressing into a shape through a steel die with a pressing pressure of five ton / cm 2, sintering in a vacuum furnace with sintering temperature of 800 DEG C, then preserving heat 1h, sizing sintered compacts through a sizing die to increase surface fineness and dimensional precision, vacuum soaking T1# special lubricating oil for the high-speed oilness bearing for 2h to prevent corrosion and finish capillary oil storage. The self-lubricating of material is realized by choosing Cu base powdered material along with solid lubricant and base strengthening elements, and the special surface structure is achieved through the powder metallurgy sintering technology controlling pore space of material, and the oilness effect of material is obtained by utilizing capillary effect.

A tool coated with a hard Ti / B layer having fine boron nitride particles dispersed therein, wherein the bonding energy of B and N is observed in an ESCA analysis of the hard coating layer; wherein peaks of c-BN and h-BN is detected in an Raman spectroscopy of the hard coating layer; wherein a ratio Q1 / Q2 of a peak intensity Q1 of c-BN to a peak intensity Q2 of h-BN is 1.0 or more; wherein a half-value width Z of a (200) face in an X-ray diffraction of the hard coating layer is in a range of 0.3° to 0.6°; and wherein a ratio K / L of a face thickness K to a flank thickness L in the tool is 1.0 or more, whereby the hard coating layer has high hardness, high lubricating properties and excellent crater wear resistance, with chemical reactions with a work suppressed.

A sliding bearing having improved seizure resistance has the following structure:(a) A bearing layer (2). It comprises a copper alloy containing in a Cu matrix Ag, Sn, Sb, In, Mn, Fe, Bi, Zn, Ni and / or Cr.(b) A first sub-layer (3) of the bearing layer (2). First sub-layer (3) contains concentrated element, hexagonal compound or eutectic of said element(s).(c) A second sub-layer (2a) in which said element in essential solid-solution state.(d) Metal backing (1).

The present invention has been made by the fact that the wettability with lubricant increases when tin grains are broken within a certain range. In an aluminum-based bearing alloy containing from 2 to 20 mass % of tin, the tin grains in a sliding surface have a size not less than 20 μm2 but not more than 50 μm2 expressed in region partitioned areas of the tin grains measured in accordance with a region partitioning method.

A thrust bearing for a turbocharger of an internal-combustion engine is made of a copper alloy including a brass matrix and a needle-like Mn—Si-based compound dispersed in the brass matrix. Not less than 50% of the needle-like Mn—Si-based compound dispersed in a region from a surface of a sliding portion of the thrust bearing to a depth of 50 μm have a major axis extending from the inside of the sliding portion to the surface. The major axis makes an angle of 30° to 150° with the surface of the sliding portion when observed in a sectional view perpendicular to the surface of the sliding portion.

A sliding surface 4A of a shoe 4 undergoes laser radiation in a shape of a large number of parallel lines to form a large number of swollen portions 6 and to form concave portions 7 in adjacent positions thereof. The swollen portions 6 and the inner side thereof become direct hardening portions 11 with high hardness and the concave portions 7 and the inner side thereof become double hardening portions 12, which are lower in hardness than the swollen portions 6.After the laser hardening, the sliding surface 4A undergoes wrapping up to a position of an imaginary line 15 to delete relief to form a flat and smooth plane. Thereafter the sliding surface 4A undergoes buffing.Thereby, portions with low hardness are chipped off more largely than portions with high hardness to form a large number of minute irregularities on the sliding surface 4A (see FIG. 6).A large number of minute irregularities is formed uniformly on the sliding surface 4A of the shoe 4 and lubrication oil will be introduced thereinto. Therefore, a shoe 4 excellent in seizing resistant property can be provided.

A vehicle motive power transmission apparatus includes: a planetary gear device; an oil pump for sucking oil present in an apparatus case; a one-way clutch that transmits normal-direction rotation output of the planetary gear device to the oil pump, but does not transmit reverse-direction rotation output of the planetary gear device to the oil pump; an oil tank which is provided in the apparatus case, and which is provided with a first introduction portion that receives oil that is splashed upward as a gear in the apparatus case rotates in a normal direction, and a second introduction portion that receives oil that is splashed upward as the gear rotates in a reverse direction; and an oil passageway that supplies the planetary gear device with oil present in the oil tank or oil sucked by the oil pump.

A material for use as self-lubricating sliding parts, which consists of a steel containing, by mass, from not less than 0.4% to less than 1.5% of C (carbon), 0.1 to 3.0% of Si, 0.1 to 3.0% of Mn, from inclusive zero to 0.5% of Cr, 0.05 to 3.0% of Ni, 0.3 to 2.0% of Al, 0.3 to 20% in total (Mo+W+V) of at least one element selected from the group consisting of Mo, W (tungsten) and V (vanadium), and 0.05 to 3.0% of Cu, wherein there can be observed graphite particles having an average particle size of not more than 3 μm in a section of the metal structure of the steel. The steel is also used as piston rings. In the steel, the graphite particles observed in the structural section occupy an area rate of not less than 1% in the overall area of the structural section, and have an average particle size of not more than 3 μm. The steel may further contain not more than 0.3% of S and / or not more than 0.01% of Ca. The steel is subjected to nitriding treatment for use.

Provided is a centrifugally cast composite roll for hot rolling in which: an outer layer (1) that is formed by centrifugal casting and an inner layer (2) comprising a ductile cast iron are integrated by welding; the outer layer has a chemical composition that includes, by mass, 1-3% of C, 0.4-3% of Si, 0.3-3% of Mn, 1-5% of Ni, 2-7% of Cr, 3-8% of Mo, 3-7% of V, 0.01-0.12% of B, and a remainder of Fe and unavoidable impurities; the relationship that is represented by Cr / (Mo + 0.5W) < -2 / 3[C - 0.2(V + 1.19Nb)] + 11 / 6 (wherein W = 0 and Nb = 0 when W and Nb are not included) is satisfied; and 1-15% of an MC carbide, 0.5-20% of a charcoal boride, and 0.5-20% of an Mo-based carbide by area ratio are included therein.