Abstract: A camshaft adjuster with a drive element, a driven element, and a pressure chamber formed between the drive element and the driven element for generating a relative rotation between the driven element and the drive element, and a volume accumulator that is arranged in the camshaft adjuster and supplies hydraulic medium via a channel from the volume accumulator to the pressure chamber if there is an under-pressure in the pressure chamber. The camshaft adjuster has a non-return valve with a closing part for closing an opening of the channel, the non-return valve allows a flow of hydraulic medium through the channel from the volume accumulator to the pressure chamber, and there is an elastically expandable component that projects into the channel and can be guided by the channel and is connected to the closing part and is provided for applying tension for pulling the closing part into the channel.

Abstract: A variable displacement hydrostatic power unit (7) is connected with an internal combustion engine (2). The power unit (7) operates as a pump to deliver hydraulic fluid to at least one consumer (V) and operates as a motor as a hydraulic starter for the internal combustion engine (2). Hydraulic fluid from a hydraulic accumulator (25) is supplied to the power unit (7) operated as a motor. The power unit (7) includes a spring device (55) which, when the internal combustion engine (2) is shut off, actuates a displacement volume control device (50) into a position with the maximum displacement volume. When the power unit (7) is actuated with hydraulic fluid from the hydraulic accumulator (25), the internal combustion engine (7) is immediately started by the power unit (7) without the need for an immediately preceding adjustment of the displacement volume control device (50) of the power unit (7).

Abstract: A variable displacement hydrostatic power unit (7) is in a drive connection with an internal combustion engine (2). When operated as a pump, the power unit (7) delivers hydraulic fluid to at least one consumer (V). When operated as a motor, the power unit (7) is a hydraulic starter for the internal combustion engine (2) and is supplied with hydraulic fluid from a hydraulic accumulator (25). The displacement volume of the power unit (7) is set by a displacement volume control device (50) actuated by a positioning device (52). The displacement volume control device (50) is displaced into a position with maximum displacement volume by a corresponding actuation of the positioning device (52) chronologically prior to the shutoff of the internal combustion engine (2). A securing device (60) holds the displacement volume control device (50) in the maximum displacement volume position when the internal combustion engine (2) is shut off.

Abstract: A drive train (1) includes an internal combustion engine (2) and working hydraulics (4) having at least one hydraulic pump (7). When operated as a pump, the hydraulic pump (7) sucks hydraulic fluid from a tank (9) and delivers into a delivery line (10) that leads to the working hydraulics (4). When operated as a motor, the hydraulic pump (7) is supplied with hydraulic fluid from a hydraulic accumulator (25). The drive train (1) has a charge pump (20) to supply a charging circuit (23). The charge pump (20), when operated as a pump, sucks hydraulic fluid out of the tank (9) and delivers into a charge pressure line (22) that leads to a charging circuit (23), and the charge pump (20) when operated as a motor is supplied with hydraulic fluid from the hydraulic accumulator (25).

Abstract: A stator (20) for a camshaft adjuster (4). The stator (20) has a ring-shaped outer part (50) for the concentric holding of a rotor (22) with vanes (34) that project in the axial direction and are arranged on the periphery around the rotor (22) and a segment (52) that projects inward in the radial direction from the ring-shaped outer part (50) for engaging between two vanes (34) of the rotor (22), in order to form, together with the two vanes (22), pressure chambers (44) of the camshaft adjuster (4). Here, the segment (52) has a cavity (70) for holding a hydraulic fluid from the pressure chambers (44).

Abstract: A drive train (1) has an internal combustion engine (2), a traction drive (3), and working hydraulics (4) having at least one hydraulic pump (7). A connecting line (26) leads to a hydraulic accumulator (25) and is connected to a delivery line (10) of the hydraulic pump (7) that leads to the working hydraulics (4). A shutoff valve (30) is located in the connecting line (26). The shutoff valve (30) is a check valve (31) that opens automatically and as a function of the pressure to allow a flow to the hydraulic accumulator (25). A pressure relief valve (32) is operatively associated with the connecting line (26) between the shutoff valve (30) and the hydraulic accumulator (25).

Abstract: An adjustment device for adjusting a relative rotational angle position of two shafts (particularly a cam shaft and a crank shaft of an internal combustion engine) that has an adjusting gear which is designed as triple shaft gear and has a drive part connected to a first shaft (crank shaft), a driven part connected to a second shaft (cam shaft), and an adjustment shaft connected to a servomotor shaft of an electric servomotor in a rotationally fixed manner. In order to implement a wide temperature range for the operation of the adjustment device, a temperature sensor is arranged in the servomotor. In a method for operating an adjustment device or an actuator, the current of the servomotor or the actuator is controlled depending on the temperature that was determined earlier.

Abstract: An actuator unit (1) of a cam shifting system, which actuator unit is mountable on an internal combustion engine or a component thereof and has at least one actuator pin (5) for moving shifting cam units of the cam shifting system into different axial positions by means of at least one shift groove formed on the periphery of the shifting cam units and cooperating with the actuator pin (5). The actuator pins (5) are spring-loaded in a direction toward the shifting cam unit, operable by a solenoid unit, and slidably supported in a housing (2) of the actuator unit (1). The housing (2) of the actuator unit (1) is provided with at least one enlargement in each inner surface facing an actuator pin (5).

Abstract: A hydrostatic pump (1) with a variable displacement volume can be operated in a closed circuit and is driven by a drive engine (2), in particular by an internal combustion engine. To control the displacement of the pump (1), a control device (4) is provided which can be actuated as a function of the speed-dependent control pressure which is a function of the speed of the drive engine (2). To improve the control characteristics of the pump, a switchover device (35) is provided, by which the pump (1) can be switched between a speed-dependent displacement control by the speed-dependent control pressure and a volume flow-dependent delivery control, in which the control device (4) of the pump (1) can be controlled as a function of the actuation of an actuator mechanism (28).

Abstract: A hydrostatic pump (1) has a mechanical displacement volume control with a mechanical control element (4), which for generation of an actuator pressure that acts on a positioning piston (5) which is functionally connected with a displacement setting device (3), has a position-controlled control valve (6) functionally connected with a control lever (30) and with the displacement setting device (3) of the pump (1). A pump with a mechanical displacement volume control with a pressure limiting function can be accomplished by mechanically decoupling the control lever (30) from the displacement setting device (3) whereby a pressure cutoff function is provided, with which, by respective pilot valves (21a, 21b), a pressure signal can be generated from a delivery line (2a, 2b) of the pump (1), which signal is transmitted via the control valve (6) to the positioning piston (5) and counteracts the control pressure.

Abstract: An adjustment device for adjusting a relative rotational angle position of two shafts (particularly a cam shaft and a crank shaft of an internal combustion engine) that has an adjusting gear which is designed as triple shaft gear and has a drive part connected to a first shaft (crank shaft), a driven part connected to a second shaft (cam shaft), and an adjustment shaft connected to a servomotor shaft of an electric servomotor in a rotationally fixed manner. In order to implement a wide temperature range for the operation of the adjustment device, a temperature sensor is arranged in the servomotor. In a method for operating an adjustment device or an actuator, the current of the servomotor or the actuator is controlled depending on the temperature that was determined earlier.

Abstract: An adjustment device (1) for adjusting the relative rotational angle position of a camshaft (2) in relation to a crankshaft of an internal combustion engine is provided, with the device having an adjustment mechanism (3), which is embodied as a triple-shaft transmission and provided with an input part (4) fixed to the crankshaft, an output part fixed to the camshaft, and an adjusting shaft (7) connected to an adjusting motor shaft (5) of an adjusting motor (6). The motor (6) is provided as an electric motor and is spatially separated from the adjusting shaft (7), and the torque produced thereby is transmitted to the adjusting shaft (7), either mechanically via a flexible shaft (8), pneumatically via a compressor (9) operating a pneumatic motor (13) using pressurized air, or hydraulically via a hydraulic motor (16) and a pump (14) providing the hydraulic medium.

Abstract: An adjustment device (1) for adjusting the relative rotational angle position of a camshaft (2) in relation to a crankshaft of an internal combustion engine is provided, with the device having an adjustment mechanism (3), which is embodied as a triple-shaft transmission and provided with an input part (4) fixed to the crankshaft, an output part fixed to the camshaft, and an adjusting shaft (7) connected to an adjusting motor shaft (5) of an adjusting motor (6). The motor (6) is provided as an electric motor and is arranged parallel to the camshaft (2). The motor generates an adjustment torque that is transmitted to the adjustment shaft (7) via a secondary drive (18) that has a belt drive, a chain drive, a cardan drive, or an additional spur gear stage.

Abstract: A camshaft adjusting device for an internal combustion engine is provided. A functionally reliable camshaft adjusting device designed for a long-lasting operation is obtained when the camshaft adjuster (13) has a lifelong lubrication located in the housing (28, 36, 37) sealed from the surrounding area be sealing covers (36, 37). The camshaft adjuster is not required to be mounted inside the cylinder head (33), but can be mounted as a separate unit on the cylinder head (33) of the internal combustion engine independent of the lubricating oil circuit. This expands, in particular, the range of possibilities for use of the camshaft adjuster (13) with a belt drive.

Abstract: The invention relates to an electric camshaft adjuster for adjusting and securing the phase angle of a camshaft of an internal combustion engine with respect to its crankshaft, having a three shaft gearing which is embodied as a harmonic drive (19, 19?) of sleeve design, and a drive wheel (1) which is fixed to the crankshaft and has a first ring gear (2) as well as an output component (4) which is fixed to the camshaft and has a second ring gear (5) arranged next to the first ring gear (2) and an adjustment shaft (10, 10?, 10?, 10??) which can be driven by an electric adjustment motor, with a wave generator (17, 17?, 17?) which has means for elliptically deforming a flexurally elastic, externally toothed sleeve (18).

Abstract: A camshaft adjuster for adjusting the relative angular positions of a camshaft and a crankshaft of an internal combustion engine in accordance with a setting shaft is provided. In which the setting shaft is driven by a setting assembly and has a driving connection with an adjusting gear through a coupling. The drive moment is transmitted in the coupling by a radial extension (21) of a first coupling half (19), which contacts a second coupling half (25) without play in a circumferential direction and which is movable in a direction of a Y-Y axis relative to a second coupling half (25). This permits compensation of eccentricities between the setting shaft of the setting assembly and the adjusting gear.

Abstract: A hydrostatic pump (1) with a variable displacement volume can be operated in a closed circuit and is driven by a drive engine (2), in particular by an internal combustion engine. To control the displacement of the pump (1), a control device (4) is provided which can be actuated as a function of the speed-dependent control pressure which is a function of the speed of the drive engine (2). To improve the control characteristics of the pump, a switchover device (35) is provided, by which the pump (1) can be switched between a speed-dependent displacement control by the speed-dependent control pressure and a volume flow-dependent delivery control, in which the control device (4) of the pump (1) can be controlled as a function of the actuation of an actuator mechanism (28).

Abstract: A hydrostatic pump (1) has a mechanical displacement volume control with a mechanical control element (4), which for generation of an actuator pressure that acts on a positioning piston (5) which is functionally connected with a displacement setting device (3), has a position-controlled control valve (6) functionally connected with a control lever (30) and with the displacement setting device (3) of the pump (1). A pump with a mechanical displacement volume control with a pressure limiting function can be accomplished by mechanically decoupling the control lever (30) from the displacement setting device (3) whereby a pressure cutoff function is provided, with which, by respective pilot valves (21a, 21b), a pressure signal can be generated from a delivery line (2a, 2b) of the pump (1), which signal is transmitted via the control valve (6) to the positioning piston (5) and counteracts the control pressure.

Abstract: Adjustment device (1) for adjusting a relative rotational angle position of a camshaft (3) relative to a crankshaft of an internal combustion engine is provided. The adjusting device includes a crankshaft-fixed drive part (4) and a camshaft-fixed driven part (5). The adjustment device (1) has an adjustment motor (2) as a primary adjustment device and an auxiliary drive (11) as a secondary adjustment device. When the adjusting motor fails, the camshaft (3) can be moved into a fixed rotational angle position, an emergency running position, by the auxiliary drive (11).

Abstract: A device and a method for determining an angle of rotation between a camshaft (5) and a crankshaft of an internal combustion engine is provided, the device including a camshaft regulator provided with an electronic regulator, and a device for determining the position of the angle of rotation of the camshaft and the crankshaft.