A hydrostatic traction drive includes a hydraulic pump for supplying pressure medium to a hydraulic motor of the traction drive. The hydraulic pump has an actuation cylinder with at least one cylinder space and a swept volume which can be adjusted thereby. At least one electrically actuable pressure valve is provided, by means of which an actuation pressure which has an adjusting effect can be applied to the cylinder space. In addition, the traction drive has a device by means of which a pressure of the hydraulic pump can be limited by influencing the actuation pressure.

A hydrostatic traction drive includes a hydraulic pump for supplying pressure medium to a hydraulic motor of the traction drive. The hydraulic pump has an actuation cylinder with at least one cylinder space and a swept volume which can be adjusted thereby. At least one electrically actuable pressure valve is provided, by means of which an actuation pressure which has an adjusting effect can be applied to the cylinder space. In addition, the traction drive has a device by means of which a pressure of the hydraulic pump can be limited by influencing the actuation pressure.

An auto tensioner is mounted on a rotating shaft of an engine auxiliary device rotating about the rotating shaft by a power transmitted through a power transmission belt. The auto tensioner pivots about a pivot shaft. The auto tensioner has one side rotatably fastened to the pivot shaft and another side fastened to a driving member, and pivots about the pivot shaft in accordance with an operation of the driving member.

An auto tensioner is mounted on a rotating shaft of an engine auxiliary device rotating about the rotating shaft by a power transmitted through a power transmission belt. The auto tensioner pivots about a pivot shaft. The auto tensioner has one side rotatably fastened to the pivot shaft and another side fastened to a driving member, and pivots about the pivot shaft in accordance with an operation of the driving member.

A hydraulically driven utility vehicle, such as a wheel loader or track loader, can automatically shift between two or more operating speed ranges based on prevailing operating conditions. The default condition may be a low speed range, and the vehicle may shift into a high speed range only if an output speed of the vehicle's hydraulic drive motor exceeds a designated threshold. The designated threshold may, for example, be a designated percentage of maximum speed. The machine may automatically shift back to the lower speed range if the output speed of the hydraulic drive motor drops beneath a second designated threshold that may lower than the first designated threshold. Other operating conditions, such as commanded speed, engine load and engine speed, may also be taken into account when determining whether to auto-shift.

A hydraulically driven utility vehicle, such as a wheel loader or track loader, can automatically shift between two or more operating speed ranges based on prevailing operating conditions. The default condition may be a low speed range, and the vehicle may shift into a high speed range only if an output speed of the vehicle's hydraulic drive motor exceeds a designated threshold. The designated threshold may, for example, be a designated percentage of maximum speed. The machine may automatically shift back to the lower speed range if the output speed of the hydraulic drive motor drops beneath a second designated threshold that may lower than the first designated threshold. Other operating conditions, such as commanded speed, engine load and engine speed, may also be taken into account when determining whether to auto-shift.

A wave energy converter generates power from a wave-induced separation of a positively buoyant flotation module and a submerged negatively buoyant mass, using a rotating pulley to drive a power-take-off system.

A wind turbine (1) comprising a turbine rotor (3) with one or more blades, a generator (4) and a drive train (5) interconnecting the turbine rotor (3) and the generator (4). The drive train (5) is provided with a main gear (6) directly driven by the turbine rotor (3). A plurality of pinions engages the main gear (6). Each of the pinions drives a hydraulic pump (7). A hydro motor (8) is connected to the respective pumps (7) via respective high pressure (9) and low pressure lines. The hydro motor (8) engages an input shaft of the generator (4). A planetary gear transmission (10) is arranged between each pinion and the respective hydraulic pump (7).

An electromagnetic valve control device includes a control signal generator to, through feedback control involving an environmental coefficient, generate a control signal intended for at least one electromagnetic valve and corresponding to a target electric current value, a coefficient determiner to determine an environmental coefficient during a learning period from a start of a driver operation to an end of a predetermined time, and an operation limiter to limit respective operations of the at least one electromagnetic valve and a gear transmission during the learning period.

A center section/motor sub-assembly for use in a hydrostatic transmission includes a center section having a pump running face for interfacing with a pump, and a motor running face for interfacing with a motor. The center section and the motor are configured for the hydraulic separating forces of the motor to be reacted only into the center section. The center section has two internal passages between pump kidney ports and motor kidney port, and the motor kidney ports are raised in elevation relative to the pump kidney ports. The internal passages run parallel to each other as they rise in elevation. A hydrostatic transmission includes the sub-assembly enclosed by a housing, in combination with a pump and output shaft assembly. For installation, the output shaft assembly is configured as a separate component from the sub-assembly of the center section and the motor.