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 mum, a Knoop hardness of 1500 to 4500 kg / mm2, a surface roughness Ry (mum) satisfying the following equation: Ry<{(0.75-Hk / 8000)xh+0.07 / 0.8}, where h is the thickness (mum) 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.

An overlay layer 3 comprising MoS2 as a solid lubricant and PAI resin as a binder resin is formed on a flattened surface of a bearing alloy layer 2, and a helical groove 4 and annular projections 5 are formed as an uneven configuration in and on the surface of the overlay layer. In accordance with the invention, a regular uneven configuration is formed on the surface of the overlay layer to allow a lubricant oil to be secured in recesses of the uneven configuration, allowing a seizure resistance to be improved. The bearing alloy layer is machined to have a flat surface having a fine roughness on its surface which represents a boundary with an overlay layer, whereby individual convex areas of the overlay layer are evenly subject to a plastic deformation, allowing the fitting property response of the sliding bearing to be improved.

A lubrication-treating process for an Al or Al alloy material is carried out by cleaning the material; applying an anodic oxidation to the cleaned material surface to form a 3 to 30 mum thick anode oxidation coating; and forming a lubrication coating including a polyester resin (30 to 70 mass parts), a particulate PTFE (30 to 70 mass parts) and ceramic (alumina) particles (0.5 to 5 mass parts), and 2 to 20 mum thick, to thereby impart excellent resistances to adhesion and seizure, and a low friction, to the Al or Al alloy material at a low cost and with no or a very low pollution of the environment.

The invention discloses a surface-hardening treatment method of sealing pairs and friction pairs of titanium and titanium alloy ball valves. The sealing pairs are related sealing parts at all sealing positions in a valve, a ball and a valve base, and the friction pairs are related friction parts at all transmission connection positions in the valve, the ball and the valve base. The surface-hardening treatment method relates to chemical heat treatment and a vapor deposition hard coating. The chemical heat treatment and the vapor deposition hard coating are simultaneously used for the sealing pairs and the friction pairs of titanium and titanium alloy ball valves so that the problem that surface hardness of the titanium and titanium alloy ball valves treated by a single chemical heat treatment process is low. Based on the chemical heat treatment, the vapor deposition hard coating is adopted so that a hardness difference of a chemical heat treatment infiltrated layer is reduced. The vapor deposition hard coating further improves bonding strength of the chemical heat treatment infiltrated layer and improves surface hardness of the titanium and titanium alloy ball valves. Even if the vapor deposition hard coating is damaged in actual use, a hardened layer formed from the chemical heat treatment infiltrated layer still has a protection effect so that dual protection is realized.

There is disclosed a sliding bearing provided with a sliding bearing layer and a back metal layer bonded to the outer face of the sliding bearing layer, the back face of which back metal layer being coated with a phosphate coating at a portion where fretting wear is apt to occur while coated with a coating of a thermally good conductor at another portion where no phosphate coating is provided, whereby seizure resistance as well as fretting resistance is improved because the dispersing of heat can be improved by the coating of the thermally good conductor.

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.

An object of the present invention is to provide a sliding member which can slide for a longer period of time even in a dry state. In the present invention, sliding layers 3 are provided on the surfaces of a base material 2, and the sliding layer 3 contains polybenzimidazole (PBI) and 1 to 70 vol % of a solid lubricant. Since PBI, which is a thermoplastic resin, has higher heat resistance and also has higher material strength than PAI, PI, and EP, which are the conventionally used thermosetting resins, the wear resistance and the anti-seizure property can be improved and a decrease in material strength caused by high-temperature atmosphere, heat generation at the time of sliding, etc. can be restrained. Furthermore, the initial conformability can be improved because of high elongation percentage. Also, since the sliding layer contains the solid lubricant, the coefficient of friction can be decreased, and hence the anti-seizure property can be enhanced.

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 film includes a solid lubricant, a binder resin, and a low-melting-point material. The binder resin is for holding the solid lubricant on a surface of a substrate, and exhibits a glass transition temperature. The low-melting-point material exhibits a melting point lower than the glass transition temperature of the binder resin. The low-melting-point material demonstrates a latent heat which can absorb frictional heat generated between sliding members, and accordingly retards the degradation of the binder resin. As a result, the sliding film produces high seizure resistance.

A bush is provided at its sliding surface with oil-supply groove portions. An area ratio of the oil-supply groove portions to the sliding surface of the journal shaft is set to 30 to 90%. A length L1 between the oil-supply groove portions in a circumferential direction and an inner diameter D of the bearing satisfy L1<πD / 36. Even in a bearing device in which the journal shaft and the bush mutually rotate in a predetermined angle range or in which the journal shaft and the bush relatively and continuously rotate, the present invention can effectively be used while maintaining the existing sizes of the journal shaft and the bush, and it is possible to prevent partial break of oil film or shortage of oil film.

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.

An overlay layer is formed on a bearing alloy layer via an intermediate layer. The overlay layer consists of Bi or a Bi alloy, and 0.05 to 25 vol % of hard particles. While the overlay layer is made of Bi or a Bi alloy, wear resistance thereof can be improved by adding the hard particles.

The invention relates to a complex processing method for prolonging the service lift of chain grate key parts, belonging to mechanical manufacturing and material processing and application technical field, which comprises: firstly, surface nondestructive testing is carried out on the key parts of the chain grate of process; molten salt complex processing are carried out in parts of the surface according to the surface drawbacks tested by surface nondestructive testing; before the laser shocks, the workpiece surface is coated with black coating layer and use water as protective layer, and the laser shock processes the area which is easy to fatigue and fracture and has concentrated stress. The molten iron pretreatment spray-feeding device before iron-making blast furnace has the advantages of simple shortcut, high efficiency, low maintenance cost, short processing time (30 minutes to 5 hours), and the continuous operation can be realized, thus, high efficiency of production is ensured.

The present invention relates to Mn series Ca containing phosphide solution in the domain of final chemical engineering. The main characteristic is its component and the ratio of its weight is: 20 - 31% H3PO4, 9 - 16% MnCO3, 0.5 - 4% HNO3, 0.3 - 3% CaOH and water it until 100%. The phosphating solution can make black, compact and twinkling phosphating film on the surface of metal, and there are also in the phosphating film. It also improved the capability of phosphating film. The experiment proves that: The phosphating film can enhance the wearable and anti-corrosive capability. The phosphating solution is steady and its component is suitable. It's easy to prepare the solution and cost little, and it's also passes over the process of copper-plates. It is the preparation of updates in phosphating solution belongs to manganese catalyst.

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 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 radial roller bearing has: an outer ring; an inner ring; and, a cylindrical roller interposed between the outer ring and the inner ring, the outer and inner rings respectively including flange portions formed in the end portions thereof so as to be opposed to the end face of the cylindrical roller, wherein, in the end face of the cylindrical roller, there is formed a circular-ring-shaped contact portion of the roller end having centers of curvature continuously existing on a circle which lies on a plane parallel to the end face of the cylindrical roller and also the center of the circle is on the rotation axis of the cylindrical roller.

A surface of aluminum alloy or iron alloy coated, on at least a part, with a lead-free copper-based coating layer comprising, by weight, 0.2–15% bismuth, and at least one metal selected from the group consisting of 5–40% nickel, 1–20% chromium, 1–20% iron, and 1–10% cobalt, the balance being copper which is more than 55%. The surface may be of a swashplate used in swashplate type compressors.

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.

An internal gear 4 is fitted within a housing 2, and a sun gear 6 is disposed inside the internal gear in concentric relationship therewith. A plurality of planet gears 8 are carried by a planetary carrier 10 connected to the housing 2 and are in meshing engagement with the internal gear 4 and the sun gear 6. Washers 16, 18, 20, 22 and 24 are disposed in regions where the members 2, 4, 6, 8 and 10 slide against respectively. Hollow shafts are connected to a coupling 14 which is connected to the inner periphery of the internal gear 4 and to the inner periphery of the sun gear 6, and a drive from an engine which is input to the housing 2 is delivered through the both shafts. A lubricant oil is introduced through the shaft to lubricate sliding parts which are disposed radially outward of the shaft. A perfect lubrication of the interior of the differential gearing is achieved, seizure resistance can be improved and the occurrence of noises can be reduced.

A vehicle motive power transmission apparatus includes: a planetary gear device (4); an oil pump (7) for sucking oil present in an apparatus case (1a); a one-way clutch (8) 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 (25) 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 (20) 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.