Abstract: The cemented carbide of the present disclosure is a cemented carbide comprising a first phase composed of a tungsten carbide particle and a second phase comprising cobalt as a main component, wherein a total content of the first phase and the second phase in the cemented carbide is 97% by volume or more, an average value of an equivalent circle diameter of the tungsten carbide particle is 0.8 ?m or less, a cobalt content of the cemented carbide is 3% by mass or more and 10% by mass or less, a vanadium content of the cemented carbide is 0.01% by mass or more and 0.30% by mass or less, and a maximum value of the vanadium content in an interface region between a (0001) crystal plane of the tungsten carbide particle and the second phase is 15 atomic % or less.

Abstract: A cemented carbide is composed of a first hard phase, a second hard phase, and a binder phase, wherein the first hard phase is composed of tungsten carbide particles and having a particle diameter D10 of 0.30 ?m to 0.60 ?m, a particle diameter D90 of 0.90 ?m to 1.40 ?m, the second hard phase contains at least one first compound selected from the group consisting of TiNbC, TiNbN, and TiNbCN, and having an average particle diameter of 0.03 ?m to 0.50 ?m, a content of the binder phase in the cemented carbide is 8.0 vol % to 16.0 vol %, an average particle diameter of the binder phase is 0.15 ?m to 0.45, a particle diameter D95 of the binder phase is 1.5 ?m or less, and a degree of dispersion of the binder phase is 0.15 to 0.25.

Abstract: A cemented carbide is a cemented carbide, composed of: hard phases comprising tungsten carbide as a main ingredient and binder phases comprising cobalt as a main ingredient, wherein the hard phases have a ratio D10/D90 of D10 being an area-based 10% cumulative particle size to D90 being an area-based 90% cumulative particle size of 0.30 or more, the binder phases have a ratio D10/D90 of D10 being an area-based 10% cumulative particle size to D90 being an area-based 90% cumulative particle size of 0.23 or more, wherein the binder phases have an average particle size of 0.25 ?m or more and 0.50 ?m or less, and wherein the hard phases have an average particle size of 0.30 ?m or more and 0.60 ?m or less.

Abstract: A cemented carbide consists of: a first phase consisting of a plurality of tungsten carbide grains; and a second phase including cobalt, an average value of equivalent circle diameters of the tungsten carbide grains is 0.5 ?m to 1.2 ?m, on number basis, the tungsten carbide grains include less than or equal to 13% of first tungsten carbide grains each having an equivalent circle diameter of less than or equal to 0.3 ?m, on number basis, the tungsten carbide grains include less than or equal to 12% of second tungsten carbide grains each having an equivalent circle diameter of more than 1.3 ?m, in a histogram indicating a distribution of the equivalent circle diameters of the tungsten carbide grains. Fmax/Fmin is less than or equal to 7.0, Fmax/Fmin being a ratio of a maximum frequency Fmax to a minimum frequency Fmin.

Abstract: A cemented carbide consists of: a first phase consisting of a plurality of tungsten carbide grains; and a second phase including cobalt, an average value of equivalent circle diameters of the tungsten carbide grains is 0.5 ?m to 1.2 ?m, on number basis, the tungsten carbide grains include less than or equal to 13% of first tungsten carbide grains each having an equivalent circle diameter of less than or equal to 0.3 ?m, on number basis, the tungsten carbide grains include less than or equal to 12% of second tungsten carbide grains each having an equivalent circle diameter of more than 1.3 ?m, in a histogram indicating a distribution of the equivalent circle diameters of the tungsten carbide grains, Fmax/Fmin is less than or equal to 7.0, Fmax/Fmin being a ratio of a maximum frequency Fmax to a minimum frequency Fmin.

Abstract: A cemented carbide including a first phase being composed of a plurality of tungsten carbide grains and a second phase containing cobalt, wherein the cemented carbide contains chromium and vanadium, a mass-based percentage of the chromium to the cobalt is 5% or more and 9% or less, a mass-based percentage of the vanadium to the cobalt is 2% or more and 5% or less, an area ratio of the second phase is 7.5 area % or more and 13.5 area % or less, and a number of the second phases is 1000 or more, wherein the area ratio of the second phase and the number of the second phases are measured in a measurement field of 101 ?m2 by performing image processing on a scanning electron microscope image of a cross section of the cemented carbide.

Abstract: A surface-coated cutting tool includes a base material and a coating film formed on a surface of the base material. The coating film includes a first alternating layer and a second alternating layer formed on the first alternating layer. The first alternating layer includes first and second layers. The second alternating layer includes third and fourth layers. One or a plurality of the first layers and one or a plurality of the second layers are layered alternately, and one or a plurality of the third layers and one or a plurality of the fourth layers are layered alternately.

Abstract: A surface-coated cutting tool includes a substrate and a coating film. The coating film includes an alternate layer. The alternate layer includes a first layer having a first composition and a second layer having a second composition. The alternate layer is formed by alternately stacking at least one first layer and at least one second layer. The first layer and the second layer each have a thickness not smaller than 2 nm and not greater than 100 nm. The first composition is expressed as TiaAlbSicN (0.25?a?0.45, 0.55?b?0.75, 0?c?0.1, a+b+c=1). The second composition is expressed as TidAleSifN (0.35?d?0.55, 0.45?e?0.65, 0?f?0.1, d+e+f=1). The first composition and the second composition satisfy a condition of 0.05?d?a?0.2 and 0.05?b?e?0.2.

Abstract: A cam shaft drive device includes a chain, a guide lever, a chain chamber, which is provided in a cylinder head, a support bolt, which pivotably supports the guide lever, the support bolt including a head portion, a male screw portion, and a shaft portion, which is inserted through the support hole of the guide lever, an insertion hole, which is through which the support bolt is inserted, and a female screw hole, which is provided in the rear wall and into which the male screw portion is screwed, wherein a length from a rear end to a front end of the shaft portion is longer than an axial distance from a front end of the support hole to a front end of the insertion hole in a state where the guide lever abuts on the rear wall.

Abstract: A scissor gear oil supplying structure includes: a scissor gear that is provided on an outer the circumference of a tip end portion of a shaft; a first oil passage; a second oil passage that extends from the first oil passage in the radial direction; an extension hole that is opened at the front end surface of the shaft; a female screw that is formed in the first oil passage on the rear side of the second oil passage; a rotating member; and a bolt that is inserted into the extension hole and the first oil passage to fasten the rotating member to the shaft and is screwed into the female screw, in which lubricating oil is guided from the first oil passage to the second oil passage along a gap between thread grooves of the female screw and thread ridges of the bolt.

Abstract: A surface-coated cutting tool includes a substrate and a coating film. The coating film includes an alternate layer. The alternate layer includes a first layer having a first composition and a second layer having a second composition. The alternate layer is formed by alternately stacking at least one first layer and at least one second layer. The first layer and the second layer each have a thickness not smaller than 2 nm and not greater than 100 nm. The first composition is expressed as TiaAlbSicN (0.25?a?0.45, 0.55?b?0.75, 0?c?0.1, a+b+c=1). The second composition is expressed as TidAleSifN (0.35?d?0.55, 0.45?e?0.65, 0?f?0.1, d+e+f=1). The first composition and the second composition satisfy a condition of 0.05?d?a?0.2 and 0.05?b?e?0.2.

Abstract: A cam shaft drive device includes a chain, a guide lever, a chain chamber, which is provided in a cylinder head, a support bolt, which pivotably supports the guide lever, the support bolt including a head portion, a male screw portion, and a shaft portion, which is inserted through the support hole of the guide lever, an insertion hole, which is through which the support bolt is inserted, and a female screw hole, which is provided in the rear wall and into which the male screw portion is screwed, wherein a length from a rear end to a front end of the shaft portion is longer than an axial distance from a front end of the support hole to a front end of the insertion hole in a state where the guide lever abuts on the rear wall.

Abstract: A scissor gear oil supplying structure includes: a scissor gear that is provided on an outer the circumference of a tip end portion of a shaft; a first oil passage; a second oil passage that extends from the first oil passage in the radial direction; an extension hole that is opened at the front end surface of the shaft; a female screw that is formed in the first oil passage on the rear side of the second oil passage; a rotating member; and a bolt that is inserted into the extension hole and the first oil passage to fasten the rotating member to the shaft and is screwed into the female screw, in which lubricating oil is guided from the first oil passage to the second oil passage along a gap between thread grooves of the female screw and thread ridges of the bolt.

Abstract: A surface-coated tool includes a substrate and a coating film formed on the substrate. The coating film includes an alternate layer in which one or more A layers and one or more B layers are alternately stacked. The A layer and the B layer each have a thickness not smaller than 2 nm and not greater than 100 nm. An average composition of the A layer is expressed as TiaAlbSicN (0.5<a<0.8, 0.2<b<0.4, 0.01<c<0.1, a+b+c=1), an average composition of the B layer is expressed as TidAleSifN (0.4<d<0.6, 0.3<e<0.7, 0.01<f<0.1, d+e+f=1), and a condition of 0.05<A?D?0.2 AND 0.05<E?B?0.2 is satisfied.

Abstract: A surface-coated cutting tool includes a base material and a coating film formed on a surface of the base material. The coating film includes a first alternating layer and a second alternating layer formed on the first alternating layer. The first alternating layer includes first and second layers. The second alternating layer includes third and fourth layers. One or a plurality of the first layers and one or a plurality of the second layers are layered alternately, and one or a plurality of the third layers and one or a plurality of the fourth layers are layered alternately.

Abstract: A cutting tool includes a substrate composed of a cermet. The cermet includes a hard phase including compounds containing Ti, at least one metal other than Ti selected from groups 4, 5, and 6 of the periodic table, and at least one element of carbon and nitrogen, a binder phase including, as a main component, an iron group metal, and unavoidable impurities. At least one type of particles selected from alumina particles and zirconia particles with an average particle size of 0.5 ?m or more and 5 ?m or less is scattered over a surface of a rake face of the substrate, and the concentration of at least one element of aluminum and zirconium in the surface is 0.5 at % or more and 5 at % or less.

Abstract: A surface-coated tool includes a substrate and a coating film formed on the substrate. The coating film includes an alternate layer in which one or more A layers and one or more B layers are alternately stacked. The A layer and the B layer each have a thickness not smaller than 2 nm and not greater than 100 nm. An average composition of the A layer is expressed as TiaAlbSicN (0.5<a<0.8, 0.2<b<0.4, 0.01<c<0.1, a+b+c=1), an average composition of the B layer is expressed as TidAleSifN (0.4<d<0.6, 0.3<e<0.7, 0.01<f<0.1, d+e+f=1), and a condition of 0.05<A-D?0.2 AND 0.05<E-B?0.2 is satisfied.

Abstract: A cutting tool includes a substrate composed of a cermet. The cermet includes a hard phase including compounds containing Ti, at least one metal other than Ti selected from groups 4, 5, and 6 of the periodic table, and at least one element of carbon and nitrogen, a binder phase including, as a main component, an iron group metal, and unavoidable impurities. At least one type of particles selected from alumina particles and zirconia particles with an average particle size of 0.5 ?m or more and 5 ?m or less is scattered over a surface of a rake face of the substrate, and the concentration of at least one element of aluminum and zirconium in the surface is 0.5 at % or more and 5 at % or less.

Abstract: There are provided a cemented carbide high in thermal diffusivity and excellent in wear resistance, and a cutting tool including a base material formed of this cemented carbide. The cemented carbide is a WC based cemented carbide in which a hard phase mainly constituted of WC grains is bound by a binder phase mainly constituted of Co, and is used for a cutting tool. The binder phase is substantially constituted of Co, or Co and Ni. A total content of Co and Ni is not less than 4.5 mass % and not more than 15 mass %. In this cemented carbide, the WC grains have an average diameter of not less than 0.4 ?m and not more than 4 ?m.

Abstract: A soft magnetic material includes a plurality of composite magnetic particles. Each of the plurality of composite magnetic particles has: a metal magnetic particle including iron; a lower film surrounding the surface of the metal magnetic particle and including a nonferrous metal; and an insulating upper film surrounding the surface of the lower film and including at least one of oxygen and carbon. The nonferrous metal has an affinity with the at least one of oxygen and carbon included in the upper film that is larger than such affinity of iron; or the nonferrous metal has a diffusion coefficient with respect to the at least one of oxygen and carbon included in the upper film that is smaller than such diffusion coefficient of iron. This configuration provides desirable magnetic properties.