Devices and systems relating to external gear machines that comprise microsurface shaping on the lateral surfaces of the gear teeth and/or bushing surfaces are provided. Such microsurface shaping may comprise a flat step to linear wedge profile, a flat step to flat step profile, or solely a linear wedge profile. The incorporation of microsurface shaping on the gear teeth and/or bushing plates contributes to improving the lubrication performance within the external gear machine and provides significant benefits, including the improvement of operating efficiency, life, and reliability of the system components. Methods for manufacturing the gear teeth and related bushings are also provided, the methods configured to optimize the overall axial balance within the system.

A hydraulic control unit comprises a housing, an accumulator, a gear pump assembly, and a motor. The housing comprises an accumulator compartment, a gear pump compartment, and a flow path section connecting the gear pump compartment and the accumulator compartment, the flow path section comprising at least a supply path and a pressurizing path. The accumulator in the accumulator compartment comprises a movable piston dividing the accumulator compartment into a high pressure reservoir and a low pressure reservoir. A gear pump assembly is in the gear pump compartment. The gear pump assembly is configured to draw return fluid from the low pressure reservoir via the supply path and to pump pressurized fluid through the pressurizing path to accumulate in the high pressure reservoir. A motor assembly is connected to the gear pump compartment of the housing and is configured to power the gear pump assembly.

A screw spindle pump for delivering a cooling liquid for cooling a battery and/or power electronics or a cleaning or supply liquid of a motor vehicle, including a housing in which a working spindle, which is coupled to a drive assembly, and at least one running spindle, which meshes with the latter, are accommodated, and including a feather key-like support element, which is fixed by the housing and against which the working spindle and the running spindle are axially supported. In the housing, there is provided at least one aperture through which it is possible to insert the support element, which, in the assembled position, is received with one end in the aperture and with the other end in a receiving part situated diametrically opposite the aperture, wherein the support element is secured via at least one securing element which closes the aperture at the outside.

Disclosed are an outer ring for an oil pump having an increased number and size of open pores in a surface of a molded article and a method for manufacturing the outer ring.

A serviceable pump includes a motor disposed at an end of the serviceable pump and connected to a gear portion with a pump shaft. The gear portion receives fluid from and outputs fluid to a system such as a deep fryer cooking system. The gear portion includes at least one channel for receiving fluid, such as oil, to lubricate the gears and a fluid discharge aperture to push fluid into a cooling loop at a first end of the cooling loop. The cooling loop cools the fluid passing through the serviceable pump and is disposed between the motor and the gear portion. The cooling loop is connected to a seal assembly that surrounds the pump input shaft at a second end of the loop. The seal assembly allows the cooled fluid to pass along the pump input shaft.

A bearing assembly for a gear pump that includes a bearing housing, a bearing, and a biasing member. The bearing housing has a housing bore that extends between a first housing end and a second housing end along a bearing axis. The bearing is disposed within the housing bore. The bearing has an outer diameter extending between a first bearing end and a second bearing end. The biasing member is disposed between the bearing and the bearing housing to apply a biasing load to the bearing.

Machine provided with a machine element (2) and an oil pump (4) and a motor (3) to drive the machine element (2) and the oil pump (4), whereby the oil pump (4) is provided with a shaft (13) with a rotor (12), whereby the oil pump (4) is provided to pump oil from an oil reservoir (5) via an inlet channel (8) to nozzles that lead into the motor (3) and/or machine element (2) to lubricate and/or cool one or more bearings or other machine components, characterized in that in the inlet channel (8), near the oil pump (4) a dam (16) is provided that is higher than the height (A) of the central axis (18) of the shaft (13) of the oil pump (4) minus the smallest diameter (B) of the rotor (12) of the oil pump (4) divided by two.

A screw-spindle pump comprising: first and second screw spindles forming running and drive spindles, respectively, and a pump housing configured to receive the first and second screw spindles. The first and second screw spindles form, with at least the pump housing, delivery chambers, moving from a suction side to a pressure side of the pump as a consequence due to rotation of the screw spindles. The pump housing has an elongate insert, as an abutment for the first and second screw spindles and against which the first and second screw spindles are supported, the elongate insert having a first portion forming a first abutment for the second screw spindle and a second portion forming a second abutment for the first screw spindle. The elongate insert is clamped into a receptacle of the pump housing using a cross-sectional dimension of the elongate insert.

Devices and systems relating to external gear machines that comprise microsurface shaping on the lateral surfaces of the gear teeth and/or bushing surfaces are provided. Such microsurface shaping may comprise a flat step to linear wedge profile, a flat step to flat step profile, or solely a linear wedge profile. The incorporation of microsurface shaping on the gear teeth and/or bushing plates contributes to improving the lubrication performance within the external gear machine and provides significant benefits, including the improvement of operating efficiency, life, and reliability of the system components. Methods for manufacturing the gear teeth and related bushings are also provided, the methods configured to optimize the overall axial balance within the system.

A bearing assembly for a gear pump that includes a bearing housing, a bearing, and a biasing member. The bearing housing has a housing bore that extends between a first housing end and a second housing end along a bearing axis. The bearing is disposed within the housing bore. The bearing has an outer diameter extending between a first bearing end and a second bearing end. The biasing member is disposed between the bearing and the bearing housing to apply a biasing load to the bearing.