Abstract: A cylinder head includes an intake-side wall part (1a) that upwardly extends from a cylinder head lower surface (lb) coupled to a cylinder block; a port circumferential wall part (4) that forms therein an intake port (3) communicating with a combustion chamber (2) of an engine; an outer longitudinal rib (14) that projects from an outer surface of the port circumferential wall part (4) on a side of the cylinder head lower surface (lb); and a boss part (13) that is bulged from the intake-side wall part (1a) on one end portion of the outer longitudinal rib (14). The port circumferential wall part (4) includes a resin part disposed along an inner surface thereof. The outer longitudinal rib (14) extends in a direction away from the intake-side wall part (1a) along a flow direction of intake air flowing inside the intake port (3). The boss part (13) includes a hole part (13a) that discharges gas in the intake port (3) when injection molding of the resin part is carried out.

Abstract: A cylinder head (1) disclosed herein includes a cylinder head main body (10) having an intake port (3) communicating with a combustion chamber (2) of an engine; and an insulation member (20) being arranged at an inner side of the intake port (3), made of resin, and formed into an annular shape. A step part (14) is formed at a downstream side of the insulation member (20) in a flow direction of intake air in the intake port (3) such that the intake port (3) has a cross section perpendicular to the flow direction at the downstream side smaller than a cross section perpendicular to the flow direction at an upstream side of the flow direction; and an annular seal member (21) that seals a space between the insulation member (20) and the step part (14) is arranged between the insulation member (20) and the step part (14).

Abstract: A cylinder head (1) disclosed herein includes a cylinder head main body (10) having an intake port (3) communicating with a combustion chamber (2) of an engine; and an insulation member (20) being arranged at an inner side of the intake port (3), made of resin, and formed into an annular shape. A step part (14) is formed at a downstream side of the insulation member (20) in a flow direction of intake air in the intake port (3) such that the intake port (3) has a cross section perpendicular to the flow direction at the downstream side smaller than a cross section perpendicular to the flow direction at an upstream side of the flow direction; and an annular seal member (21) that seals a space between the insulation member (20) and the step part (14) is arranged between the insulation member (20) and the step part (14).

Abstract: A cylinder head includes an intake-side wall part (1a) that upwardly extends from a cylinder head lower surface (1b) coupled to a cylinder block; a port circumferential wall part (4) that forms therein an intake port (3) communicating with a combustion chamber (2) of an engine; an outer longitudinal rib (14) that projects from an outer surface of the port circumferential wall part (4) on a side of the cylinder head lower surface (1b); and a boss part (13) that is bulged from the intake-side wall part (1a) on one end portion of the outer longitudinal rib (14). The port circumferential wall part (4) includes a resin part disposed along an inner surface thereof. The outer longitudinal rib (14) extends in a direction away from the intake-side wall part (1a) along a flow direction of intake air flowing inside the intake port (3). The boss part (13) includes a hole part (13a) that discharges gas in the intake port (3) when injection molding of the resin part is carried out.

Abstract: An intake passage structure for an engine includes an intake port in a cylinder head of the engine, and connected to a combustion chamber to define an intake passage. The intake passage structure further includes a heat insulating member disposed along an inner surface of the intake port, and including a bulge having an upstream end surface which is a portion of an upstream end surface of the heat insulating member, the bulge has a radially outwardly protruding radially outer surface and has an increased wall thickness. The wall thickness of the bulge increases from downstream to upstream of the intake port. The upstream end surface of the bulge includes an injection machine connecting portion facing an injection gate configured to inject resin for forming the heat insulating member into the intake port.

Abstract: An intake passage structure for an engine includes an intake port in a cylinder head of the engine, and connected to a combustion chamber to define an intake passage. The intake passage structure further includes a heat insulating member disposed along an inner surface of the intake port, and including a bulge having an upstream end surface which is a portion of an upstream end surface of the heat insulating member, the bulge has a radially outwardly protruding radially outer surface and has an increased wall thickness. The wall thickness of the bulge increases from downstream to upstream of the intake port. The upstream end surface of the bulge includes an injection machine connecting portion facing an injection gate configured to inject resin for forming the heat insulating member into the intake port.

Abstract: A support structure for a crankshaft includes a crankshaft that is rotatably supported on a cylinder block of an internal combustion engine and has an end portion protruding from the cylinder block, a sprocket that is attached on the end portion protruding from the cylinder block and is connected to a cam shaft, a pulley that is attached on the end portion on an opposite side from the sprocket with respect to the cylinder block and is connected to an auxiliary apparatus, and an end bearing that rotatably supports the end portion relative to the cylinder block and is provided on the end portion between the sprocket and the pulley.

Abstract: A support structure for a crankshaft includes a crankshaft that is rotatably supported on a cylinder block of an internal combustion engine and has an end portion protruding from the cylinder block, a sprocket that is attached on the end portion protruding from the cylinder block and is connected to a cam shaft, a pulley that is attached on the end portion on an opposite side from the sprocket with respect to the cylinder block and is connected to an auxiliary apparatus, and an end bearing that rotatably supports the end portion relative to the cylinder block and is provided on the end portion between the sprocket and the pulley.

Abstract: An exhaust gas purification device for an internal combustion engine comprises, an exhaust passage including a catalyst for conveying exhaust gas discharged from the engine to the outside, and a bend formed by bending a portion of the exhaust passage directly upstream of the catalyst, the bend causing exhaust gas discharged from the engine to collide against a corner portion between an inlet end face of the catalyst and such portion of a wall of the exhaust passage that follows the outside of the bend, thereby increasing pressure at the corner portion, compared with the other portion of the inlet end face, and an additive injection valve fitted to the outside of the bend of the exhaust passage to inject an additive in such manner that the injected additive passes just above the corner portion and falls on the inlet end face of the catalytic converter.

Abstract: Control is performed such that when an HC adsorption catalytic converter having an oxygen storage capacity is in a specified temperature range, fuel supply quantity is increased with a first increase ratio relative to basic fuel quantity based on the operating state of an internal combustion engine, in a first specified period after the end of fuel cut, and increased with a second increase ratio smaller than the first increase ratio, in a second specified period succeeding the first specified period.

Abstract: The exhaust gas purification device of an internal combustion engine of the present invention comprises an exhaust passage for guiding an exhaust gas exhausted from an engine to outside, a catalyst provided in the exhaust passage, an injection path connected on an upstream side of the catalyst in the exhaust passage, an additive injection valve installed in the injection path for supplying an additive to the catalyst through the injection path, and an inflow portion provided in a merging portion where the exhaust passage and the injection path merge for having a part of the exhaust gas flowing in the exhaust passage flow into the injection path.

Abstract: A degradation estimating apparatus for an unburned fuel component adsorption catalyst, which is connected with an internal combustion engine and has an unburned fuel component adsorbent and an oxygen storage component is provided. The apparatus includes a degradation estimating unit for making estimation for a degradation of the unburned fuel component adsorption catalyst on the basis of a first term and a second term. The first term is from the cancellation of the fuel supply to detecting a variation of an upstream side air-fuel ratio occurring due to the increase of the reductant quantity in the exhaust gas. The second term is from the cancellation of the fuel supply to detecting of a variation of the downstream side air-fuel ratio due to an increase of the reductant quantity.

Abstract: The exhaust gas purification device of an internal combustion engine of the present invention comprises an exhaust passage for guiding an exhaust gas exhausted from an engine to outside, a catalyst provided in the exhaust passage, an injection path connected on an upstream side of the catalyst in the exhaust passage, an additive injection valve installed in the injection path for supplying an additive to the catalyst through the injection path, and an inflow portion provided in a merging portion where the exhaust passage and the injection path merge for having a part of the exhaust gas flowing in the exhaust passage flow into the injection path.

Abstract: An emission control system, includes: an exhaust pipe portion, adapted to guide exhaust gas from an engine to outside; a catalyst, accommodated in the exhaust pipe portion; an additive injection valve, provided at the exhaust pipe portion located at upstream side of the catalyst, and configured to inject additives to be supplied to the catalyst toward a flow of the exhaust gas in the exhaust pipe portion. The exhaust pipe portion has a flow path section located at upstream side of the catalyst, which intersects an injection flow of the additives injected by the additive injection valve, and the flow path section is made to have substantially the same shape as an injection region of the injection flow which confronts the exhaust gas.

Abstract: The present invention provides an exhaust gas purification device for an internal combustion engine, comprising an exhaust passage including a catalyst for conveying exhaust gas discharged from the engine to the outside, and a bend formed by bending a portion of the exhaust passage directly upstream of the catalyst, the bend causing exhaust gas discharged from the engine to collide against a corner portion between an inlet end face of the catalyst and such portion of a wall of the exhaust passage that follows the outside of the bend, thereby increasing pressure at the corner portion, compared with the other portion of the inlet end face, and an additive injection valve fitted to the outside of the bend of the exhaust passage to inject an additive in such manner that the injected additive passes just above the corner portion and falls on the inlet end face of the catalytic converter.

Abstract: Control is performed such that when an HC adsorption catalytic converter having an oxygen storage capacity is in a specified temperature range, fuel supply quantity is increased with a first increase ratio relative to basic fuel quantity based on the operating state of an internal combustion engine, in a first specified period after the end of fuel cut, and increased with a second increase ratio smaller than the first increase ratio, in a second specified period succeeding the first specified period.

Abstract: The present invention relates to a degradation estimating apparatus for an unburned fuel component adsorption catalyst, which is connected with an internal combustion engine and has an unburned fuel component adsorbent and an oxygen storage component. The apparatus includes a degradation estimating unit for making estimation for a degradation of the unburned fuel component adsorption catalyst on the basis of a first term and a second term. The first term that is from the cancellation of the fuel supply to detecting a variation of an upstream side air-fuel ratio occurring due to the increase of the reductant quantity in the exhaust gas. The second term that is from the cancellation of the fuel supply to detecting of a variation of the downstream side air-fuel ratio due to an increase of the reductant quantity.