A pump system for supplying lubricant to components of a wind turbine comprises: a pump for pumping lubricant through a fluid circuit of the wind turbine; a drive means for driving the pump; and, a gearbox arrangement arranged to couple the drive means to the pump. The gearbox arrangement comprises a rotatable input shaft configured to be driven by the drive means and a rotatable output shaft configured to drive the pump. The input shaft is rotatable in a first direction of rotation and a second direction of rotation when driven by the drive means. The output shaft is rotatable in the first direction of rotation, and the speed of rotation of the output shaft is determined by an operational mode of the gearbox arrangement. In a first mode of operation, when the input shaft rotates in the first direction of rotation at a first speed of rotation, the gearbox arrangement is configured to drive the output shaft to rotate also in the first direction of rotation at the first speed of rotation. In a second mode of operation, when the input shaft rotates in the second direction of rotation at the first speed of rotation, the gearbox arrangement is configured to drive the output shaft to rotate in the first direction of rotation at a second speed of rotation.

In an electric oil pump device including a drive power source and a gear device through which a vehicle drive force of the drive power source is transmitted, the electric oil pump device delivering a lubricant oil to the gear device, and generating a hydraulic pressure for controlling the gear device, a pump portion for delivering the lubricant oil, a motor portion for operating the pump portion, and a driver portion for controlling an operation of the motor portion are included. The pump portion, motor portion and driver portion are formed integrally with each other, or the driver portion is disposed adjacent to the motor portion. The pump portion and a part or an entirety of the motor portion are disposed within a space defined by an oil pan and a casing accommodating the gear device, and the driver portion is disposed outside the casing and the oil pan.

The invention relates to a lubricant dispenser comprising a storage container (1) filled with lubricant and a pump (2) which is connected to or can be connected to the storage container (1) and by means of which the lubricant can be pumped out of the storage container (1). The pump has a pump housing (3) with an inlet opening (4) and an outlet opening (5), a piston (6) which is movably guided in the pump housing (3) in a linear manner, and a drive (7) which acts on the piston (6). The pump housing (3) of the pump (2) is connected to or can be connected to the storage container (1), and the piston (6) can be raised or lowered cyclically by the drive (7) in order to pump a lubricant from the inlet opening (4) to the outlet opening (5). The lubricant dispenser is characterized in that the piston (6) is designed in a stepped manner with an upper piston surface (10) which delimits an upper displacement chamber (8) and a lower piston surface (11) which delimits a lower displacement chamber (9) and is reduced compared to the upper piston surface (10). The upper displacement chamber (8) adjoins the inlet opening (4) via a first valve (13), and the first valve (13) is loaded or can be loaded into a closed base position. A through-opening (12a, 12b) which connects the upper displacement chamber (8) to the lower displacement chamber (9) with the interposition of a second valve (14) is arranged in or on the piston (6), and the lower displacement chamber (9) transitions into the outlet opening (5) via an outlet channel (16). When the piston (6) is lowered as the result of a negative pressure in the upper displacement chamber (8), the first valve opens (for example against a spring force), and lubricant is suctioned out of the storage container into the upper displacement chamber (8), but the second valve (14) closes and lubricant is pushed out of the lower displacement chamber (9) into the outlet channel (16). When the piston (6) is raised, the first valve (13) closes, but the second valve (14) opens in the piston (6), and lubricant both flows from the upper displacement chamber (8) into the lower displacement chamber (9) and is pushed from the lower displacement chamber (9) into the outlet channel (16).

A lubricant pump includes a housing mountable to the upper end of a lubricant container and having a vertical central bore, an outlet passage extending between the central bore and an outlet port fluidly connectable with the lubricant distributor and a vent chamber having an inlet and an outlet. A vent inlet passage extends between the central bore and the vent chamber inlet and a vent outlet passage extends between the vent chamber outlet and a vent outlet port fluidly connectable with a container cavity. A movable valve element is disposed within the vent chamber and displaceable along an axis between a position in which the valve element obstructs the chamber inlet and/or the chamber outlet and a second position in which the chamber inlet is fluidly connected with the chamber outlet to provide an internal flow path from the central bore to the vent outlet port.

A steam turbine valve drive apparatus in an embodiment includes a piston, a cylinder, a bidirectional pump, a servo motor, and a quick closing mechanism. The cylinder houses the piston in an inner space thereof, the inner space being partitioned by the piston into a first hydraulic chamber and a second hydraulic chamber. The quick closing mechanism executes a quick closing operation of closing the steam valve unit more quickly than the closing operation. Here, the quick closing mechanism executes the quick closing operation by feeding the working oil accumulated in an accumulator to the second hydraulic chamber and draining the working oil from the first hydraulic chamber.

A method for controlling a DC pump motor, preferably a brushed DC motor for pumping lubricant, which motor is controlled by a pulse-width modulated (PWM) control signal, wherein current parameters are acquired in an acquisition step and a duty cycle (D) of the PWM control signal (S.sub.PWM) is adapted and/or changed on the basis of the detected parameters in an adaptation step, wherein the acquisition of current parameters comprises at least the acquisition of a current input voltage (U.sub.B).

The present invention relates to an electric grease barrel pump and, more particularly, to an electric grease barrel pump which is configured to supply an appropriate amount of grease to an attachment connected to a distribution valve by enabling an actuator of the distribution valve to operate in conjunction with and according to a change in the number of stages of a driving means.

A lubricating oil pump device includes a pump main body and a lubricating oil cartridge, wherein the pump main body comprises: a suction part; a discharge part; a piston; a relief valve; a pressure detection sensor; a control part; a first pipeline; an inlet-side check valve, between the suction part and the discharge part, for preventing lubricating oil, having moved to the first pipeline, from flowing back to the lubricating oil cartridge; an outlet-side check valve, between the suction part and the discharge part, for preventing the lubricating oil, having been supplied to a lubricating oil supply pipe, from flowing back to the first pipeline; a second pipeline; a third pipeline; and a fourth pipeline, the pressure detection sensor detects pressure inside the pump main body through the fourth pipeline.

Disclosed is a lubricant supply device, including at least a first housing section forming a reservoir for a lubricant, a second housing section including a feed pump for feeding the lubricant from the reservoir to a lubricant outlet and a motor driving at least the feed pump,
the motor being arranged in the first housing section forming the reservoir.

A drive device includes a gear unit, which is able to be driven by a motor and includes a pressure-lubrication system. The pressure-lubrication system has a distributor block, having a continuous longitudinal bore and continuous transverse bores. The distributor block is arranged as a single piece, in particular from metal such as steel or aluminum.