Abstract: A hydraulic oil control valve includes a sleeve, a spool and a spring. The spool is received at an inside of the sleeve and is configured to be reciprocated. The spring is configured to be seated against a spring seat of the sleeve and is configured to apply a preload to the spool. The sleeve has a stepped portion, which has a spool contact surface for limiting movement of the spool toward the spring seat, and a protrusion, which is located at a center of the spring seat and protrudes toward an opening of the sleeve. The protrusion has a sloped peripheral surface. The protrusion is configured such that in a state where an end portion of the spring is not seated against the spring seat while the spring is placed adjacent to the spring seat, the end portion of the spring contacts the protrusion.

Abstract: A valve timing adjustment device includes a hydraulic oil control valve. The hydraulic oil control valve includes: an outer sleeve that is shaped in a tubular form and has a projection at an outer periphery of the outer sleeve; an inner sleeve that is located on an inner side of the outer sleeve; and a spool that is located at an inside of the inner sleeve. A reference-shape portion, which serves as a reference at a time of positioning the outer sleeve relative to the inner sleeve, is formed at an outer periphery of the projection. A seat surface of the projection, which fixes a vane rotor between the seat surface of the projection and an end portion of one of a drive shaft and a driven shaft, is shaped in a rotationally symmetric form that is rotationally symmetric around a rotational axis.

Abstract: A check valve is made of a resilient body wound in a ring form and is located in an annular flow passage. A displacement limiter includes: a limiter main body that is located on an outer side of the check valve and is configured to limit displacement of the check valve in a diameter increasing direction of the check valve; and a limiter flow passage that communicates between one side and the other side of the limiter main body in an axial direction to enable hydraulic oil to flow between the one side and the other side of the limiter main body through the limiter flow passage.

Abstract: Provided is a coated cutting tool of long tool life and that affords superior machined surface quality. A coated cutting tool includes a substrate, and a coating layer formed on the substrate. The coated cutting tool includes at least one flank face, at least one rake face, and a honing section rounded and connecting the flank face and the rake face. The coating layer includes a lower layer, an intermediate layer and an upper layer, in this order from the side of the substrate. The lower layer is composed of one, or two or more Ti compound layers made up of a Ti compound of Ti and at least one element selected from the group consisting of C, N, O and B. The intermediate layer contains ?-type Al2O3. The upper layer contains a compound represented by following formula (1): Ti(C1-x-yNxOy) (1). An average thickness of the coating layer on the flank face side is 5.0 ?m more and 30.0 ?m or less.

Abstract: A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises a lower layer, an intermediate layer, and an upper layer in this order from the substrate side; the lower layer comprises one or two or more Ti compound layers containing a Ti compound of Ti and an element of at least one kind selected from the group consisting of C, N, O and B, the intermediate layer comprises an ?-Al2O3 layer containing ?-Al2O3, and the upper layer comprises a TiCNO layer containing TiCNO; an average thickness of the coating layer is 5.0 ?m or more and 30.0 ?m or less; in a specific first cross section, a misorientation A satisfies a specific condition; and in a specific second cross section, a misorientation B satisfies a specific condition.

Abstract: A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein the coating layer includes a predetermined lower layer, an intermediate layer comprising ?-Al2O3, and an upper layer comprising TiCN; the lower layer, intermediate layer, and upper layer have predetermined average thicknesses; a condition represented by formula (1) [RSA?40 (1)] is satisfied; the interface of the intermediate layer on the upper layer side has a kurtosis roughness (Sku) of more than 3.0; the interface of the intermediate layer on the upper layer side has a skewness roughness (Ssk) of less than 0; and a condition represented by formula (2) [RSB?40 (2)] is satisfied.

Abstract: A hydraulic oil control valve, which is placed along a rotational axis of a valve timing adjusting device, includes a sleeve and a spool configured to slide in an axial direction on an inner side of the sleeve in a radial direction. The sleeve includes: an inner sleeve that has an opening in which a distal end portion of the spool is inserted; and an outer sleeve. In a state where the spool is positioned farthest from an actuator, the distal end portion projects from the opening toward a side that is opposite to the actuator.

Abstract: A check valve is made of a resilient body wound in a ring form and is located in an annular flow passage. A displacement limiter includes: a limiter main body that is located on an outer side of the check valve and is configured to limit displacement of the check valve in a diameter increasing direction of the check valve; and a limiter flow passage that communicates between one side and the other side of the limiter main body in an axial direction to enable hydraulic oil to flow between the one side and the other side of the limiter main body through the limiter flow passage.

Abstract: A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises a lower layer including at least one Ti compound layer containing a specific Ti compound, an intermediate layer including an ?-type Al2O3 layer containing ?-type Al2O3, and an upper layer including a TiCN layer containing TiCN; the respective layers are laminated in this order from the substrate side toward a surface side of the coating layer; an average thickness of the coating layer is from 5.0 ?m or more to 30.

Abstract: A coated cutting tool, comprising: a substrate; and a coating layer formed on the substrate, wherein the coating layer includes a lower part layer and an upper part layer formed on the lower part layer, the lower part layer has an average thickness of 2.0 ?m or more and 15.0 ?m or less, and is formed of a Ti oxycarbonitride layer including a compound having a composition represented by formula (1) below: Ti(C1-x-yNxOy)??(1) (where, x denotes an atomic ratio of an N element based on a total of a C element, the N element, and an O element, y denotes an atomic ratio of the O element based on a total of the C element, the N element, and the O element, and 0.35?x?0.60 and 0.01?y?0.10 are satisfied), a FWHM of a rocking curve of a plane (4,2,2) of the lower part layer, which is obtained through X-ray diffraction, is 20° or less, the upper part layer is formed of an ?-aluminum oxide layer having an average thickness of 1.0 ?m or more and 15.

Abstract: A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein the coating layer includes a predetermined lower layer, an intermediate layer comprising ?-Al2O3, and an upper layer comprising TiCN; the lower layer, intermediate layer, and upper layer have predetermined average thicknesses; a condition represented by formula (1) [RSA?40 (1)] is satisfied; the interface of the intermediate layer on the upper layer side has a kurtosis roughness (Sku) of more than 3.0; the interface of the intermediate layer on the upper layer side has a skewness roughness (Ssk) of less than 0; and a condition represented by formula (2) [RSB?40 (2)] is satisfied.

Abstract: Provided is a coated cutting tool of long tool life and that affords superior machined surface quality. A coated cutting tool includes a substrate, and a coating layer formed on the substrate. The coated cutting tool includes at least one flank face, at least one rake face, and a honing section rounded and connecting the flank face and the rake face. The coating layer includes a lower layer, an intermediate layer and an upper layer, in this order from the side of the substrate. The lower layer is composed of one, or two or more Ti compound layers made up of a Ti compound of Ti and at least one element selected from the group consisting of C, N, O and B. The intermediate layer contains ?-type Al2O3. The upper layer contains a compound represented by following formula (1): Ti(C1-x-yNxOy) (1). An average thickness of the coating layer on the flank face side is 5.0 ?m more and 30.0 ?m or less.

Abstract: A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises a lower layer, an intermediate layer, and an upper layer in this order from the substrate side; the lower layer comprises one or two or more Ti compound layers containing a Ti compound of Ti and an element of at least one kind selected from the group consisting of C, N, O and B, the intermediate layer comprises an ?-Al2O3 layer containing ?-Al2O3, and the upper layer comprises a TiCNO layer containing TiCNO; an average thickness of the coating layer is 5.0 ?m or more and 30.0 ?m or less; in a specific first cross section, a misorientation A satisfies a specific condition; and in a specific second cross section, a misorientation B satisfies a specific condition.

Abstract: A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises a lower layer including at least one Ti compound layer containing a specific Ti compound, an intermediate layer including an ?-type Al2O3 layer containing ?-type Al2O3, and an upper layer including a TiCN layer containing TiCN; the respective layers are laminated in this order from the substrate side toward a surface side of the coating layer; an average thickness of the coating layer is from 5.0 ?m or more to 30.

Abstract: A coated cutting tool, comprising: a substrate; and a coating layer formed on the substrate, wherein the coating layer includes a lower part layer and an upper part layer formed on the lower part layer, the lower part layer has an average thickness of 2.0 ?m or more and 15.0 ?m or less, and is formed of a Ti oxycarbonitride layer including a compound having a composition represented by formula (1) below: Ti(C1-x-yNxOy)??(1) (where, x denotes an atomic ratio of an N element based on a total of a C element, the N element, and an O element, y denotes an atomic ratio of the O element based on a total of the C element, the N element, and the O element, and 0.35?x?0.60 and 0.01?y?0.10 are satisfied), a FWHM of a rocking curve of a plane (4,2,2) of the lower part layer, which is obtained through X-ray diffraction, is 20° or less, the upper part layer is formed of an ?-aluminum oxide layer having an average thickness of 1.0 ?m or more and 15.

Abstract: A coated cutting tool includes a substrate and a coating layer formed onto the surface of the substrate. The coating layer contains an ?-type aluminum oxide layer. A residual stress value at the (116) plane of the ?-type aluminum oxide layer is greater than 0. A residual stress value at the (012) plane of the ?-type aluminum oxide layer is smaller than 0.

Abstract: In a valve timing adjusting device, a vane rotor includes a second supply oil passage connectable to a first supply oil passage of a second shaft. A check valve is provided between the vane rotor and the second shaft, and permits a flow from the first supply oil passage toward the second supply oil passage and prevents a flow from the second supply oil passage toward the first supply oil passage. A fixing unit is provided between the check valve and the second shaft, and fixes the check valve between the fixing unit and the vane rotor. The fixing unit includes a third supply oil passage which connects the first supply oil passage and the second supply oil passage. A filter is provided for the fixing unit and can capture foreign substances flowing through the third supply oil passage.

Abstract: A coated cutting tool includes a substrate and a coating layer formed onto the surface of the substrate. The coating layer contains an ?-type aluminum oxide layer. A residual stress value at the (116) plane of the ?-type aluminum oxide layer is greater than 0. A residual stress value at the (012) plane of the ?-type aluminum oxide layer is smaller than 0.

Abstract: In a valve timing adjusting device, a vane rotor includes a second supply oil passage connectable to a first supply oil passage of a second shaft. A check valve is provided between the vane rotor and the second shaft, and permits a flow from the first supply oil passage toward the second supply oil passage and prevents a flow from the second supply oil passage toward the first supply oil passage. A fixing unit is provided between the check valve and the second shaft, and fixes the check valve between the fixing unit and the vane rotor. The fixing unit includes a third supply oil passage which connects the first supply oil passage and the second supply oil passage. A filter is provided for the fixing unit and can capture foreign substances flowing through the third supply oil passage.

Abstract: A first one-way valve is provided in a first advance passage connecting a hydraulic pump to a control advance chamber. A second one-way valve is provided in a first retard passage connecting the hydraulic pump to a control retard chamber. A first control valve is provided in a second advance passage to bypass the first one-way valve for communication of the first advance passage. A second control valve is provided in a second retard passage to bypass the second one-way valve for communication of the first retard passage. The first control valve operates by the pilot pressure to close the second advance passage at advance controlling and opening it at retard controlling. The second control valve operates by the pilot pressure to close the second retard passage at retard controlling and open it at advance controlling.