Abstract: An engine system for ensuring a sufficient boost pressure during engine braking and improving a braking force of a compression release brake. The system includes: a compression release brake device that operates a compression release brake to obtain a braking force during engine braking by forcibly opening an exhaust valve and releasing a compressive pressure near a compression top dead center of an engine; a power-assisted turbocharger including a turbine disposed on an exhaust passage of the engine and driven by exhaust, a compressor disposed on an intake passage and driven by a rotational torque of the turbine, and an electric motor that assists a drive force of the compressor; and an electric motor control unit that drives the electric motor when the compressor release brake is operated.

Abstract: A turbocharger system includes: a high-pressure stage turbocharger including a high-pressure stage turbine disposed on an exhaust passage and driven by exhaust, and a high-pressure stage compressor disposed on an intake passage and driven by a rotational torque of the high-pressure stage turbine; and a low-pressure stage turbocharger including a low-pressure stage turbine disposed on the exhaust passage of a more downstream side than the high-pressure stage turbine and driven by exhaust, and a low-pressure stage compressor disposed on the intake passage of a more upstream side than the high-pressure stage compressor and driven by a rotational torque of the low-pressure stage turbine, wherein the high-pressure stage turbocharger includes an electric motor that assists a drive force of the high-pressure stage compressor.

Abstract: A combustion chamber structure of a direct injection engine includes a cavity recessed in a center of a top of a piston into which fuel is injected from an injector disposed above the piston. The cavity includes a curved section on a lower part of a side wall of the cavity and which has a vertical cross-sectional shape defined by an arc protruding outward in a radial direction of the piston. The cavity also includes a bottom wall straight line section on a bottom wall. The cavity also includes a bottom wall transition curved section between the bottom wall straight line section and the curved section which has a vertical cross-sectional shape defined by a transition curve having a curvature radius continuously changing from a curvature radius of the arc to an infinite value.

Abstract: A piston ring reduces reciprocating friction between a piston and an inner wall surface of a cylinder, while maintaining reduction effect of the reciprocating friction. The piston ring is mounted in a ring groove of the piston, and slides against the inner wall surface of a cylinder liner or a cylinder. The piston ring includes: plural fine recessed portions formed in a barrel width region on an outer peripheral sliding surface of the piston ring; and a non-recessed portion area where no recessed portions are formed in the barrel width region. The non-recessed portion area is configured to have an area percentage within a range from 20-85% in the barrel width region where an area percentage of the barrel width region before the recessed portions are formed is defined to be 100%. The non-recessed portion area exists through an entire cross section in an axial direction of the barrel width.

Abstract: A turbocharger system for achieving both improvement of fuel efficiency by engine downsizing and excellent shock loading resistance. The system includes: a power-assisted turbocharger mounted on a vehicle having an accessory and including a turbine disposed on an exhaust passage of an engine and driven by exhaust, a compressor disposed on an intake passage and driven by a rotational torque of the turbine, and an electric motor that assists a drive force of the compressor; and an electric motor control unit that drives the electric motor when the accessory is being driven.

Abstract: An engine system for ensuring a sufficient boost pressure during engine braking and improving a braking force of a compression release brake. The system includes: a compression release brake device that operates a compression release brake to obtain a braking force during engine braking by forcibly opening an exhaust valve and releasing a compressive pressure near a compression top dead center of an engine; a power-assisted turbocharger including a turbine disposed on an exhaust passage of the engine and driven by exhaust, a compressor disposed on an intake passage and driven by a rotational torque of the turbine, and an electric motor that assists a drive force of the compressor; and an electric motor control unit that drives the electric motor when the compressor release brake is operated.

Abstract: A turbocharger system for simultaneously improving a fuel efficiency and obtaining a satisfactory hill start performance due to a downsized engine. The system includes an electric assist turbocharger which includes a turbine disposed in an exhaust passage of an engine and driven by exhaust gas, a compressor disposed in an intake passage and driven by a rotational torque of the turbine, and an electric motor assisting a driving force of the compressor and an electric motor control unit which drives the electric motor when detecting a start operation at a sloping road.

Abstract: An engine system capable of immediately restarting an engine upon detecting a driver's reaccelerating operation while an engine speed is decreased by idle-stop control. The system includes an idle-stop control unit which performs the idle-stop control of stopping fuel injection to the engine when the engine idly rotates upon stopping the vehicle by connecting an electric assist turbocharger obtained by the combination of a turbocharger and a motor to an intake and exhaust system of the engine. The idle-stop control unit is configured to restart the engine by resuming the fuel injection to the engine while operating a motor upon detecting the reaccelerating operation during the idle-stop control.

Abstract: A turbocharger system includes: a high-pressure stage turbocharger including a high-pressure stage turbine disposed on an exhaust passage and driven by exhaust, and a high-pressure stage compressor disposed on an intake passage and driven by a rotational torque of the high-pressure stage turbine; and a low-pressure stage turbocharger including a low-pressure stage turbine disposed on the exhaust passage of a more downstream side than the high-pressure stage turbine and driven by exhaust, and a low-pressure stage compressor disposed on the intake passage of a more upstream side than the high-pressure stage compressor and driven by a rotational torque of the low-pressure stage turbine, wherein the high-pressure stage turbocharger includes an electric motor that assists a drive force of the high-pressure stage compressor.

Abstract: A turbocharger system for ensuring a sufficient exhaust gas recirculation (“EGR”) amount in all operating conditions, and reducing NOx emission from an engine. The system includes an EGR controller that re-circulates a part of exhaust gas discharged from the engine to an intake side. The turbocharger is a power-assisted turbocharger including an electric motor that assists a drive force of a compressor. The EGR controller controls an amount of exhaust gas recirculated to the intake side so as to inhibit the generation of NOx regardless of an amount of oxygen necessary for combustion of the engine. An electric motor control unit drives the electric motor, by the control of the EGR controller, when the amount of oxygen necessary for the combustion of the engine is deficient.

Abstract: An objective lens driving apparatus includes: an objective lens opposing a signal recording surface of an optical disc; a lens holder configured to hold the objective lens; and an actuator configured to displace the lens holder in a focusing direction or a tracking direction of the optical disc, the actuator including a coil attached to the lens holder, a magnet configured to generate a magnetic field effectively acting on the coil, and a yoke having the magnet fixed thereto, the yoke formed by bending a sheet of metal plate into a rectangular shape around an axis in the tracking direction, and the magnet fixed to the yoke with an adhesive.

Abstract: An optical pickup unit comprising: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a reinforcement member that is fitted on the lens holder and reinforces strength of the lens holder.

Abstract: An optical pickup unit comprising: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a reinforcement member that is fitted on the lens holder and reinforces strength of the lens holder.

Abstract: An objective lens driving apparatus comprising: an actuator movable unit that is configured such that a driving coil is mounted on a lens holder with an objective lens, and is supported on an actuator frame displaceably and elastically; a magnetic circuit that includes a magnet fixed to the actuator frame to form an effective magnetic field for the driving coil; and a rolling canceling coil that is so mounted on the lens holder as to act on the effective magnetic field formed by the magnetic circuit so effectively that a driving force is generated in a tilt direction that cancels rolling generated when a drive signal is supplied to a tracking coil to drive the actuator movable unit in a tracking direction.

Abstract: An optical pickup unit is disclosed which comprises: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a heat transfer improving member that is fitted on the holder to cause heat to be radiated, wherein the heat is generated in the coil when the coil is energized.

Abstract: An objective lens driving apparatus comprising: an actuator movable unit that is configured such that a driving coil is mounted on a lens holder with an objective lens, and is supported on an actuator frame displaceably and elastically; a magnetic circuit that includes a magnet fixed to the actuator frame to form an effective magnetic field for the driving coil; and a rolling canceling coil that is so mounted on the lens holder as to act on the effective magnetic field formed by the magnetic circuit so effectively that a driving force is generated in a tilt direction that cancels rolling generated when a drive signal is supplied to a tracking coil to drive the actuator movable unit in a tracking direction.

Abstract: An optical pickup unit is disclosed which comprises: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a heat transfer improving member that is fitted on the holder to cause heat to be radiated, wherein the heat is generated in the coil when the coil is energized.

Abstract: The present invention is directed to a bearing structure for a camshaft to prevent obliquely wiping off the oil from the surface of the camshaft caused by a knife edge. A lower journal (3) for supporting the camshaft (2) is formed with a counterbore (6) cutting off a part of a bearing surface (5) of the lower journal (3). A connecting part between the bearing surface (5) and the counterbore (6) is formed with a recess (11) hollowed from the bearing surface (5). A part of an edge (11a) connecting the recess (11) to the bearing surface (5) is elongated along a perpendicular direction to an axis of the bearing surface (O5), and a remaining part of the edge (11b) is elongated along a parallel direction to the axis (O5). The part of the edge (11a) does not wipe off the oil in the axis direction (O5), while the oil wiped by the remaining part of the edge (11b) is received into the recess (11) and is used for lubrication.

Abstract: The present invention is directed to a bearing structure for a camshaft to prevent obliquely wiping off the oil from the surface of the camshaft caused by a knife edge. A lower journal (3) for supporting the camshaft (2) is formed with a counterbore (6) cutting off a part of a bearing surface (5) of the lower journal (3). A connecting part between the bearing surface (5) and the counterbore (6) is formed with a recess (11) hollowed from the bearing surface (5). A part of an edge (11a) connecting the recess (11) to the bearing surface (5) is elongated along a perpendicular direction to an axis of the bearing surface (O5), and a remaining part of the edge (11b) is elongated along a parallel direction to the axis (O5). The part of the edge (11a) does not wipe off the oil in the axis direction (O5), while the oil wiped by the remaining part of the edge (11b) is received into the recess (11) and is used for lubrication.

Abstract: The present invention prevents abnormal wear of the friction surfaces surrounding the rocker arm, prevents poor lubrication when the engine is started at low temperature after a long period of shutdown, and improves reliability. A bag-shaped oil sump (24) opening upward is provided in the middle part of the rocker arm main body (17). A roller (15) and a roller pin (16) are provided inside the oil sump (24) and when the engine stops, these are immersed in the oil in the oil sump (24). When the engine stops, the area between the roller (15) and the roller pin (16) is lubricated. Further, when the engine is re-started after a long period of shutdown, until the oil has risen, the area between the roller (15) and the cam (8) can be lubricated using the oil adhering to the roller (15). When the rocker arm (6) oscillates downward, the oil in the oil sump (24) is supplied from the oil exhaust (28) by spraying towards the valve shaft end.