Provided is a gear pump or a motor provided with: a casing internally provided with a gear housing compartment in which a pair of gears are housed; a side plate interposed between the casing and the gears; and a gasket which is disposed on a non-slide surface, and which divides a space between the non-slide surface and the casing into a high pressure side and a low pressure side. The gear pump or the motor is configured such that, in order to discover early the mounting of the side plate in a wrong attitude, such as the upper and lower sides thereof being reversed or the high pressure portion side and the low pressure portion side being reversed, flow rate efficiency is decreased when the side plate is in an attitude other than a predetermined attitude, compared to when the side plate is in the predetermined attitude.

Provided is a gear pump device that enables improvement in volumetric efficiency and manufacturability, and also makes it possible to ensure sealing property and to reduce drive torque. According to the present invention, a sealing mechanism is provided with an annular rubber member, an outer member, and an inner member, wherein: the inner member has, at an end of an outer peripheral wall on the side of an inner gear in the axial direction, a notch which is recessed radially inward of the inner gear so as to form, together with an axial one end face of the inner gear, a depressed part; and the outer member has an insertion part which is disposed within the depressed part and which abuts against the axial one end face of the inner gear so as to constitute a part of a sealing surface on the other side.

A geared fluid machine has a machine housing and first and second intermeshing gearwheels that are rotatably mounted in the machine housing with respect to an axis of rotation and are arranged at least partially contacting by their end faces. At least one axial washer is arranged in the machine housing with axial play and has on a distal side a pressure field surrounded by a circumferential seal. The seal contacts and seals against a first bearing surface of the axial washer, and also contacts and seals against a second bearing surface of the machine housing. The seal is at least partially U-shaped in section and has a first seal limb contacting the first bearing surface, a second seal limb contacting the second bearing surface, and a connecting limb connecting the first and second seal limbs.

A geared positive-displacement machine (10), comprising a housing (11) provided with a suction port and with a discharge port, a pair of gearwheels (14, 15) that are housed and supported by respective shafts (16, 18) for the rotation in a space inside the housing (11) and in fluid communication with the suction port and the discharge port, wherein the gearwheels (14, 15) mesh with each other and have parallel or coinciding axes and a first wheel (14) thereof is driving and a second wheel (15) is driven, a pair of containment bodies (19, 20) for axially containing the wheels (14, 15), said containment bodies (19, 20) being associated with the housing (11) and each comprise a first face (19a, 20a) that faces the pair of gearwheels (14, 15) and a second face (19b, 20b) that is axially opposite with respect to the first face (19a, 20a), and, for each of the two wheels (14, 15), a plurality of rolling bodies (21) that form a crown and that are freely housed in an annular seat (22) that is coaxial to the respective shaft (16, 18) and that is defined at the interface between the first face (19a, 20a) of at least one of the two containment bodies (19, 20) and the surface (14a, 15a; 14b, 15b) of the wheels (14, 15) that in turn faces it, respectively in the first face (19a, 20a) of at least one of the two containment bodies or in the surface (14a, 15a; 14b, 15b) of the gearwheels facing the first face (19a, 20a), wherein the rolling bodies (21) rest on rolling tracks (23, 24) respectively integral with the wheels (14, 15) and with the at least one containment body (19, 20). Between the first face (19a, 20a) of the at least one containment body (19, 20) and the surface (14a, 15a; 14b, 15b) of the wheels (14, 15) facing the first face a distance (D) greater than zero exists.

One or more techniques and/or systems are disclosed for a pump technology that provides for more effective and efficient transfer of liquids, such as glycol products, in a glycol dehydration system. Such a technology can comprise a type of external gear pump that can effectively handle harsh conditions associated with glycol dehydration system at high pressures, while providing for longer pump life, effective operations at higher temperatures, and operations that account for thermal shock; with improved sealing capability, in a cost-effective system. An example pump may comprise hardened internal components, improved clearances, a jacket to mitigate thermal shock, and/or a thermal shock plate to mitigate thermal shock.

An oil pump includes: a first core in which an inner rotor having external teeth and an outer rotor having internal teeth are housed; a housing having a recess in which the first core is held; a second core disposed in contact with the first core in an axial direction; and a cover having a holding hole in which the second core is held. The first core has a first recess/projection portion formed on a first axial end surface at a side opposite to an axial end surface opposing a bottom wall of the recess. The second core has a second recess/projection portion formed on a second axial end surface that is in contact with the first axial end surface. A gap is formed between opposing surfaces of the housing and the cover in a state where the first and second axial end surfaces are in contact with each other.

An improved repair method and repair kit for gerotor pumps that have become damaged or worn via insertion of a wear plate to directly contact the gerotor and engine casing in order to allow the pump to create a sound seal once more.

A rotary positive displacement pump comprising a pair of forwardly-positioned sealing arrangements and a pair of forwardly-positioned sleeves are received within a cavity providing for easy maintenance of the pump when the seals need to serviced. Each of the sealing arrangement includes a dynamic seal and a static seal. The dynamic seal abuts a corresponding sleeve and hub while a static seal is established between the corresponding sleeve and rotor.

A gear pump bearing can include a body sized and shaped to occupy a portion of a pump housing cavity such that a clearance is formed between the body and a pump housing. The gear pump bearing can also include at least one clearance consuming feature extending from an outer surface of the body configured to reduce motion of the body within the pump housing cavity.

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.