Abstract:
A variable nozzle area jet pump is provided having a nozzle-sealing member resiliently urged to form a sealing closure. The sealing member is part of a normally non-passing pressure control valve that recirculates excess fluid back to the inlet of a positive displacement fluid pump. The fluid is recirculated with elevated pressure after a threshold fluid pressure is exceeded. The disclosed system provides for energy conservation and pump cavitation speed increase. The system may be integrated with an engine balance shaft module so as to provide low cost robustness to low speed gear noise emissions by application of the oil pump's drive torque to at lease one gearset.
Abstract:
An oil pump, comprising a rotor (3) performing a pump action for sucking oil in a suction passage (24) from suction ports (27) and feeding the oil to a delivery passage through delivery ports (19) according to the rotation thereof and an oil control valve for returning excess oil as a return flow to the suction passage (24) through a bypass passage (29) when the flow of the oil in the delivery passage (28) is excessively high, wherein an erosion resistant member (9) having an erosion resistance is installed on the inner wall surface of at least one of the suction passage (24) and the bypass passage (29) at a position opposed to the return flow of the oil, and the erosion resistant member (9) is formed in a discontinuous shape (for example, V-shape or U-shape) around a centerline (P1) in a cross section orthogonal to the centerline (P1).
Abstract:
A pump includes a housing, a drive shaft, a centrifugal pump portion having an impeller, and a gear pump portion having first and second gears. The impeller and one of the first and second gears are mounted to the drive shaft to drive the centrifugal pump portion and the gear pump portion at the same rotational speed. The gear pump can be a crescent internal gear (CIG) pump. The drive shaft can be rotated by a magnetic drive. The drive shaft can include a longitudinal bore in fluid communication with a cavity in the magnetic drive and with a discharge of the centrifugal pump portion to circulate working fluid through the magnetic drive to cool the drive. An impeller can be coupled to an inlet of the centrifugal pump portion.
Abstract:
[0034] A novel and useful improvement to vane pumps, both variable displacement vane pumps and fixed displacement vane pumps, provides a supply of pressurized fluid to the region within the diameter of the pump rotor which would otherwise be a region of reduced pressure wherein air could be ingested by the pump. By reducing or preventing the ingestion of air, operating noise and damage to the pump can be reduced and wear in an engine or other system supplied from the pump can be reduced. The supply of pressurized working fluid also can be used to lubricate auxiliary components and/or accessories as well. Further, a portion of the supply of pressurized working fluid to this region can act to supercharge the pump, reducing the occurrence of cavitation at higher operating speeds.
Abstract:
The invention relates to a pump, such as a steering servo pump, with a flow regulation valve device and an injection device, whereby the fluid flow(s) from the flow regulation valve entrain fluid returning to the pump from a suction tube connection or a tank arrangement, to supply a steering servo system and an additional user in the vehicle, such as a hydraulic motor for a ventilator drive.
Abstract:
A suction pump (22) suitable for use in a fuel dispensing system (20) or other fluid delivery system for volatile liquids. The suction pump includes a pump casing that defines a pump chamber (52) with inlet and outlet ports. A rotor (54) with vanes (58) is seated in the pump chamber. The vanes define fluid cavities (96a, 96b, 96c, ... 96f) that rotate between the inlet and outlet ports. During each turn of the rotor, each fluid cavity passes through a section of the pump chamber in which it is isolated from both the inlet port and outlet port. A bleed duct (102) extends from the outlet port. A bleed port (104) extends from the bleed duct to the section of the pump chamber that defines the isolated position of the fluid cavities. During operation of the pump, pressurized fluid discharged from the outlet port flows through the bleed duct and bleed port into the isolated fluid cavity. This pressurized fluid compresses vapor bubbles in the fluid cavity to prevent their rapid decompression when the cavity is later subjected to additional decompression. This initial decompression of the vapor bubbles reduces the noise generated when the fluid cavity is subjected to rapid compression when it is positioned adjacent the outlet port.
Abstract:
Une pompe a engrenage (10) possede une enceinte (12) definissant une premiere et une seconde cavites d'engrenages (38, 40) et un orifice d'entree et un orifice de sortie (42, 44). Une paire d'engrenages en prise (20, 22) ayant une pluralite de dents (32) et de racines de dents (36) est positionnee dans les cavites. Une paire de fentes de purge (50) sont prevues pour communiquer directement avec les racines des dents d'engrenage et permettre a l'air et au fluide entraines d'etre degagees des orifices d'entree et de sortie. De maniere avantageuse, les fentes de purge sont situees generalement adjacentes aux points de sortie (46) des cavites respectives, et une paire de fentes de charge (62) sont prevues pour faire communiquer la pression depuis l'orifice de sortie avec les dents d'engrenage et favoriser le mouvement de l'air entraine radialement vers l'interieur, vers les fentes de purge.
Abstract:
The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.
Abstract:
The invention relates to a control device for positive displacement pumps, consisting of a throttle device (20) and a flow control valve (18). The flow control valve (18) is provided with a flow control piston (21) and regulates an unrequired excess flow to the pump at an increased speed. The throttle device (20) produces a speed-related pressure differential in a bore section (17A), said pressure differential being responsible for the displacement of the flow control valve (18) and the throttle device (20). The throttle device (20) is placed in the pressure outlet (bore section 17A) of the pump and contains a regulating pin (27) which is connected to the flow control piston (21), having a control contour which is embodied in such a way that a modifiable through cross-section is created in association with a throttle bore (28). The control pin (27) has a wider section (34) in an axial displacement area of the throttle device (20), said area not being involved in control of the volume flow, whereby a minimum obturating section arises in the displacement area. This results in accelerated movement of the flow control piston (21), which in turn results in quicker reaction of the control mechanism, thereby preventing an overshoot and overincrease in the flow capacity.