Class 418/78 - Working fluid portion fills intertooth spaces or spaces between adjacent vanes

Subclass of Class 418 - Rotary expansible chamber devices
Definition: Apparatus in which the shallow recess or groove traverses
No. of patents: 30
Last issue date: 04/22/2008

Browse patents
Browse applications

Number	Title	Issue Date
7361001	Hydraulic vane pump A hydraulic vane pump includes a plurality of members forming a recession and an orifice in fluid communication with one another and with rotating vane cells at an inlet sector of the pump. Air entrained in the vane cells is exhausted through the recession and the o...	04/22/2008
7331775	Pumping device A hydraulic pump is provided that reduces or eliminates unwanted noise, local pressure waves, pressure pulsations or cavitation and the like through use of pressure and suction chambers that are in substantial fluid isolation except for a backflow connection with a ...	02/19/2008
7318422	Fluid pump assembly A fluid pump includes an electric motor with a casing and a drive shaft extending from the casing, a pumping element coupled to the drive shaft for rotation with the shaft to take in fluid and discharge it under pressure. The fuel pump casing may be sealed and a hou...	01/15/2008
7275921	Pumps A pump e.g. a screw pump, includes a main pumping element and a generally parallel auxiliary pumping element, and a pump housing, the main and auxiliary pumping elements interacting with each other and with an internal wall of an elongate pumping chamber of the hous...	10/02/2007
7114931	Rotary pump A rotary pump includes a stator housing and a rotor. The stator housing preferably has an oblong inner surface. The rotor, which is disposed in the stator housing, preferably has a substantially circular outer surface within which a plurality of vane slots are defin...	10/03/2006
6896500	Gear pump A bottom portion of an intake port is provided with a sloped bottom surface formed of a plane such that sloped bottom surface approaches the side surfaces of external teeth and internal teeth from an upstream side to a downstream side in rotational direction of two ...	05/24/2005
6821099	Rotary pump A dual chamber or double sided rotary pump includes a stator housing and a rotor. The stator housing has an oblong inner surface. The rotor, which is disposed in the stator housing, has a substantially circular outer surface within which a plurality of vane slots ar...	11/23/2004
6709245	Regulated pump The invention relates to a pump, in particular to oil pumps for internal combustion engines comprising a gear assembly or rotor assembly with one each of a pressure and suction region arranged in a pump housing, which may be sealed from each other by means of an axi...	03/23/2004
6234775	Pump with deformable thrust plate A pump comprises a housing and a pump unit arranged therein. The pump unit comprises a first and a second thrust plate and a ring arranged therebetween and having a through opening. The ring rests on the two thrust plates at least at an outer peripheral r...	05/22/2001
5733111	Gerotor pump having inlet and outlet relief ports A gerotor pump includes a pair of relief ports superimposed on and directly communicating with the pump's inlet and outlet channels, respectively. The relief ports simultaneously communicate with an open mesh pumping chamber so as to provide an intermitte...	03/31/1998
5730589	Hydraulic displacement machine having gears pressed toward each other A hydraulic displacement machine including two external gears located in the machine housing and meshing with each other, with the teeth of the two gears sealingly engaging the inner surface of the housing, and with meshing teeth of the two gears sealing ...	03/24/1998
5413470	Internal gear pump for wide speed range In an internal gear pump, which can also be constructed as pump with suction control, to reduce the undesired cavitation effects in the pressure region and to permit the oil to flow off from the diminishing displacement cells between the teeth of the gear...	05/09/1995
5046933	Vane pump with pressure leaking groove to reduce pulsations In a vane pump, a pump housing assembly contains a cam ring having an internal cam surface. A rotor carrying plural vanes is disposed within the cam ring and rotated by a drive shaft. Both end surfaces of the cam ring contact with a pair of flat contact s...	09/10/1991
4968233	Hydraulic gear motor A gear motor includes a housing provided with a cylindrical opening therein. A cover covers the opening of the housing to form an enclosed chamber. A shaft is rotatably supported on the cover and housing. An outer tooth gear is axially movably mounted on ...	11/06/1990
4768934	Port arrangement for rotary positive displacement blower An improved rotory positive displacement blower (10) of the Roots-type with reduced airborne noise and superior efficiency. The blower includes a housing (12) defining generally cylindrical chambers (32, 34) having cylindrical wall surfaces (20a, 20b) and...	09/06/1988
4744732	Variable capacity vane compressor A variable capacity vane compressor comprises additional refrigerant inlet ports formed in one of front and rear side blocks of a cylinder accommodating a rotor, and communicating a suction chamber with a compression chamber on a suction stroke, and a con...	05/17/1988
4501535	Variable flow reversible vane pump A variable flow reversible vane pump having a rotor with slidable vanes, a shaft providing rotary power take off for the rotor and a cam ring wherein said rotor rotates with the vanes engaging the inside of the cam ring. A case encases the cam ring and a ...	02/26/1985
4368013	Gear motor with fluid pressure groove and recess to facilitate starting A rotary positive-displacement fluid-pressure motor which includes a casing, having an inlet port and an outlet port, at least two intermeshing rotors of toothed or lobed form housed for rotation in the casing, and means for conducting pressure fluid deri...	01/11/1983
4355964	Gear pump having fluid deaeration capability A gear pump (10) is disclosed having a housing (12) defining first and second gear cavities (38,40) and inlet and outlet ports (42,44). A pair of intermeshing gears (20,22) having a plurality of teeth (32) and teeth roots (36) are positioned in the caviti...	10/26/1982
4343602	Gear wheel pump with reduced power requirement A gear pump with reduced power requirement for conveying viscous liquids, especially thermoplastic fiber-forming polymer melts or a viscose spinning liquid, with intermeshed gear wheels rotatably mounted on parallel shafts while encased or circumscribed i...	08/10/1982
4311444	Pressure-balancing end plate for a reversible gear pump or motor A reversible gear pump or motor capable of sustained operation under unusually high pressure conditions is provided with a unique diverter plate having pressure-transmitting paths in the ends of the plate which open to the gear teeth on both the high and ...	01/19/1982
4289460	Bearing lubrication system for gear pump having clearance between bearing and housing wall for preventing entry of contaminants larger than lubrication passage A gear pump suitable for pumping contaminated fuel has a lubrication passage in a pump bearing which receives fuel from the clearance volume between the bearing and the housing in the pump discharge arc. The clearance entrance between the bearing and the ...	09/15/1981
4256443	Rotary vane-type engine throttle channels communicating between adjacent working spaces A rotary vane-type engine includes a rotor, a cam ring surrounding the rotor, and working vanes slidably disposed in radial slots of the rotor and engaging with one of their ends the inner contour of the cam ring. The vanes subdivide the space formed betw...	03/17/1981
4239468	Apparatus for controlling pressure distribution in gear pump A pressure plate provides metering grooves in a face thereof contiguous to the gears of a gear pump. The grooves communicate certain pockets between adjacent gear teeth with other such pockets so as to meter fluid from pockets in which fluid is trapped at...	12/16/1980
4215977	Pulse-free blower A three-lobe Root's blower is provided with feed back structure to bring the gas trapped in the impeller well volumes up to the discharge pressure prior to delivery. An essentially uniform and pulse-free discharge is produced by having a constant feed bac...	08/05/1980
4137018	Rotary vane variable capacity compressor A reciprocating vane rotary compressor for an automotive air conditioning system wherein the compressor capacity may be varied in response to the evaporator pressure or temperature such that the evaporator pumps only the amount of refrigerant required at ...	01/30/1979
4130383	Apparatus for noise suppression in a gear pump A pressure plate provides a trapped pressure relief groove oriented along the line of action of mating gears in a gear pump. The groove communicates the fluid trapped between the gear teeth with both the inlet and outlet, thereby reducing high squeezed pr...	12/19/1978
4097206	Gear pump or motor with bypass throttle passage to prevent cavitation A gear pump or motor in which a pair of meshing gears are rotatably mounted in a housing and in which a throttle passage provides communication between a region of the housing in which, during rotation of the gears, high pressure is maintained and the reg...	06/27/1978
4084926	Rotary gear pump A rotary gear pump comprising two excentrically arranged gear wheels of different sizes, of which the greater gear wheel is rotatably mounted in the generally cylindrical housing of the pump and the smaller gear wheel is mounted upon a shaft which is arra...	04/18/1978
4060343	Capacity control for rotary compressor A rotary fluid compressor of the sliding vane type having a housing containing a closed working chamber and a rotor eccentrically mounted in the chamber. A control member is rotatably mounted in the housing and provided with an elongated arcuate aperture ...	11/29/1977

PatentStorm

Quotables

PatentStorm News

Class 418/78 - Working fluid portion fills intertooth spaces or spaces between adjacent vanes