Abstract: A waste heat retrieval system of a vehicle may include a reservoir disposed in a lower side of a exhaust gas boiler and in which a predetermined space is formed, a retrieval line that connects the exhaust gas boiler with the reservoir, a retrieval supply control valve disposed to open or close the retrieval line, and a control portion that controls the retrieval supply control valve to open the retrieval line such that working fluid of the exhaust gas boiler is returned to the reservoir if a retrieval condition is satisfied. Accordingly, the working fluid of the exhaust gas boiler in a waste heat retrieval system may be retrieved to the reservoir and therefore the freezing problem of the working fluid can be substantially resolved.

Abstract: Provided is a variable valve operating apparatus for an internal combustion engine, which can switch, based on an actuation of a single actuator, operating characteristics of valves for a plurality of cylinders collectively and smoothly using a rigid member, while suppressing an increase in wear of a guide rail and reducing the number of delay mechanisms. A changeover mechanism to switch operating characteristics of valves for each cylinder of first and second cylinder groups is provided. The changeover mechanism includes link shafts as a rigid member which is displaced when being engaged with a helical guide rail as a result of the actuation of an electromagnetic solenoid. The changeover mechanism includes a delay mechanism, which delays the displacement of the second link shaft in a cylinder in which the valves are lifting when the electromagnetic solenoid is actuated, at some point in the link shafts between the first cylinder group and the second cylinder group.

Abstract: A sealing system of rotary piston machines, the rotor excludes rotor discs which are arranged next to one another, and which are seated on the common rotor axle and are pressed apart from one another by acting spring and/or gas forces in the joints between the discs in such a way that the end sides of the discs which point towards the side walls of the housing bear sealingly against the latter and thus prevent the access of the medium to the axles. Assemblies comprising movable shaped lamellae which adapt to the changing joint widths and prevent an inner flow around the rotor are present in the part joints between the discs.

Abstract: The invention relates to a method for generating energy by means of thermal cycles with high pressure and moderate temperature steam, which allows improving the energy and operational efficiency of the conversion of heat energy into mechanical or electrical energy by means of thermal cycles in which the temperature of the steam is limited to moderate values in its generation, comprising the following steps: a) generating steam at a pressure above 65 bar and a moderate temperature below 400° C., b) expanding said steam in a steam turbine, steam of an intermediate pressure, comprised between 10-40 bar, with a moderate moisture, below 15%, being obtained c) drying said steam by means of a moisture separator and reheating said steam, d) expanding said steam in the turbine, and e) heating boiler water used to generate the steam by means of a plurality of steam extractions from the turbine, in order to exchange heat with said boiler water.

Abstract: A valve drive device for switching the stroke of gas exchange valves of an internal combustion engine includes a camshaft configured, at least in part, as a hollow shaft. A cam unit includes at least two different cams disposed on the camshaft so as to be rotationally engaged and axially displaceable with respect thereto. An adjustment sleeve is disposed so as to be rotationally engaged on an adjustment shaft and rotatable and axially displaceable inside the camshaft. The adjustment sleeve includes thereon a closed adjustment contour extending about a circumference of the adjustment sleeve and is operatively connected to the cam unit through an adjustment clearance in the camshaft via a first coupling element configured to permanently engage in the adjustment contour. A further coupling element is configured to permanently engage in the adjustment contour and connect to the camshaft so as to be fixed in position.

Abstract: A valve-timing control apparatus includes a drive rotator configured to receive a rotation from a crankshaft; a driven rotator fixed to a cam shaft; and an electric motor. The electric motor includes a stator fixed to the driven rotator, a rotor that rotates relative to the stator, a coil provided to at least one of the stator and the rotor, and a motor output shaft fixed to the rotor.

Abstract: In a valve drive arrangement of an internal combustion engine, having a first camshaft unit which comprises an outer shaft and primary cams connected to the outer shaft, a second camshaft unit which comprises an inner shaft disposed in the outer shaft, secondary cams connected to the inner shaft and disposed on the outer shaft and an adjusting unit for adjusting the two camshaft units relative to each other an adjusting unit provides for an at least two stage sequential valve stroke wherein, in a switching process, two shaft elements of a camshaft unit are displaced sequentially one after the other.

Abstract: In a valve train device, particularly of an internal combustion engine, which device has an actuating device for displacing at least one axially displaceable cam element and a cam element shifting gate for axially displacing the cam element and furthermore at least one switch unit with a switch element and an actuator for operating the switch element so as to engage the cam element shifting gate at least in one switching position and to move the switch element into a desired switching position, the cam element shifting gate has at least one intermediate segment for terminating a switching action.

Abstract: A stator-cover unit (1) for a camshaft adjuster (31), which is produced in one piece from a sintered material, including a stator (3) and a locking cover (5) which has a slot (17) for rotationally locking a rotor (33). According to the invention, the sintered material has at least in the region of the slot (17) a Vickers hardness of 400 HV to 850 HV. The invention further relates to a camshaft adjuster (31) having such a stator-cover unit (1) with the aforementioned properties, in which a rotor (33) having a number of radially outwardly extending rotor vanes (35) is positioned. The stator-cover unit (1) is simple to produce. A separate insertion part for the slot (17) is not required.

Abstract: A camshaft adjuster (2) having a vane-type design with a stator (4) and a rotor (6), which can be rotated relative to the stator (4), and at least two pressure chambers (8a, 8b) formed between the stator (4) and the rotor (6). The pressure chambers (8a, 8b) are separated from each other by a radially oriented vane (12) of the rotor (6), wherein the pressure chambers (8a, 8b) can be alternately supplied with a pressure medium. The vane (12) has a radial face (20) and two lateral faces (20) that are directed toward the pressure chambers (8a, 8b). The radial face (20) is sealed by a U-shaped sealing element (26) having a main limb (30) and two side limbs (32) seated against the lateral faces (22). The pressure chambers (8a, 8b) of the camshaft adjuster (2) are sealed particularly reliably by designing check valves (28) on the side limbs (32) of the sealing element (26) and by designing, on the lateral faces (22) of the vane (12), outlets for the pressure medium with which the check valves (28) are associated.

Abstract: A camshaft adjuster (1) that has a spring (4) covered at least partially by a spring cover (5) is provided, with the spring cover (5) having spacer elements (6) that fix the spring ends (7) in the axial direction such that the spring windings of the spring (4) have, as much as possible, no axial contact with the peripheral components.

Abstract: In a scroll air compressor as a scroll fluid machine capable of being downsized with an increased cooling effect, cooling air entering through a fixed inlet of a fixed cooling passage provided at the rear of a fixed scroll, and an orbiting inlet of an orbiting cooling passage provided at the rear of an orbiting scroll, is allowed to flow out of an fixed outlet and an orbiting outlet, respectively. Thereafter, the cooling air is guided to an outer periphery of the other end of the casing through a side duct and a guide duct, and then sucked into an inner peripheral side of a centrifugal fan to be discharged outwardly from an exhaust port provided in a fan cover.

Abstract: Reciprocating-piston internal combustion engine with intake and exhaust valves actuatable by sliding cams of a camshaft, arranged so that they are rotationally locked but axially moveable on a base shaft, and with an actuator unit for each sliding cam unit with at least one actuator pin for the displacement of the sliding cam units into different axial positions. The actuator pins are spring-loaded in the direction of the sliding cam unit and are fixable in their retracted position away from the sliding cam unit by latches having spring-loaded control needles that correspond to clamping bodies of the latches and are releasable via an electromagnet and permanent magnets that are in active connection with the control needles, and acceleration of the control needles defined by the spring force of each moving mass due to their springs is compensated by the acceleration of the actuator pins due to their allocated compressive springs.

Abstract: A variable-camshaft-timing mechanism is provided with a conically spiral spring valve as a check valve. When the conically spiral spring valve is opened, a plurality of flow passage clearances are formed between adjacent windings of the check valve, whereby a pressure loss of the working fluid can be reduced when passing through the check valve. When a reverse flow is generated, the check valve receives the reverse flow in its axial direction. Thus, the reverse flow of the working fluid can be utilized as a thrust force in a close direction of the check valve. A valve closing responsiveness of the check valve can be improved.

Abstract: A roller follower includes a roller ring, a shaft and a plurality of rollers. At least one of the roller ring, the shaft and the rollers is a steel member made of steel containing 0.7 to 2.4% carbon and 10.0 to 20.0% chromium, with remainder iron and impurities. In addition, carbide containing at least any one of iron and chromium as well as carbon and having an area of 12.6 ?m2 or greater is generated at an area ratio of 5.0% or higher, at a rolling contact surface of the steel member (a roller ring rolling contact surface, a shaft rolling contact surface and a roller rolling contact surface.

Abstract: A camshaft for actuating the gas exchange valves of an internal combustion engine. The camshaft includes a camshaft tube, a hydraulic camshaft adjuster, a valve for controlling the hydraulic fluid supplied to the camshaft adjuster and an actuation device, arranged in the interior of the camshaft tube, for actuating the valve. The actuation device is secured against displacement in the axial direction. The camshaft is light-weight and functional elements in addition to the actuation device and optionally the valve can be integrated into the interior of the camshaft. It should furthermore be possible to arrange an oil or vacuum pump at the end of the camshaft opposite the camshaft adjuster, the pump being drivable by the camshaft. The actuation device is designed as an electromagnetic, piezoelectric or electrical actuator and is connected to the camshaft tube such that they rotate together.

Abstract: A camshaft that is assembled or is to be assembled carries at least one cam element that is to be disposed on a main camshaft body to be rotationally fixed and axially movable, and at least one cam element to be disposed on the main camshaft body so as to be rotationally fixed and axially immovable. The main camshaft body has first axial sub-sections having a multi-tooth profile, so that due to a positive connection between shaft and hub the cam element to be disposed in the sub-section so as to be axially movable is seated so as to be rotationally fixed. The main camshaft body also has second axial sub-sections having an extended diameter so that by a non-positive connection between shaft and hub it is ensured that the cam element to be disposed in the sub-section is seated so as to be rotationally fixed and secured against movement.

Abstract: An internal-combustion engine with two intake valves for each cylinder is provided with a system for variable actuation of the intake valves, comprising a single solenoid valve for each cylinder that controls communication of the pressurized-fluid chamber of the system with an exhaust channel. The solenoid valve is a three-way, three-position solenoid valve, comprising an inlet permanently communicating with the pressurized-fluid chamber and with the hydraulic actuator of an intake valve, and two outlets communicating, respectively, with the actuator of the other intake valve and with said exhaust channel. The solenoid valve has a first position, in which the inlet communicates with both of the outlets, a second position, in which the inlet communicates only with the aforesaid outlet connected to the actuator of an intake valve and does not communicate, instead, with the outlet connected to the exhaust channel, and a third position, in which the inlet does not communicate with any of the two outlets.

Abstract: A steam engine and an electric motor are arranged, which respectively drives an air compressor. The compressed air from the air compressor is supplied to a compressed air using device through a common air tank. The steam is supplied to the steam engine through a steam supply path, and the steam used in the steam engine is supplied to a steam using device through a steam exhaust path. The steam pressure is monitored by a pressure sensor arranged in a steam header ahead of the steam exhaust path. The air pressure is monitored by a pressure sensor arranged in an air tank. A steam supply valve is controlled based on the steam pressure and the air pressure, and the electric motor is controlled based on the air pressure. The steam engine is preferentially driven over the electric motor by shifting the target value of the air pressure.

Abstract: A control system for an engine includes a first lift control module and a second lift control module. The first lift control module increases lift of M valves of the engine to a predetermined valve lift during a period before disabling or re-enabling N valves of the engine. The second lift control module decreases the lift of the M valves to a desired valve lift during a period after enabling or re-enabling the N valves of the engine, wherein N and M are integers greater than or equal to one.