Class 418/79 - Radial groove

Subclass of Class 418 - Rotary expansible chamber devices
Definition: Apparatus in which the shallow recess or depression has
No. of patents: 35
Last issue date: 07/12/2011

Browse patents
Browse applications

Number	Title	Issue Date
7976297	Gear pump including introduction paths and return paths An intended purpose of this invention is to realize a gear pump suitable for delivery of high-pressure and high-viscosity fluids by using helical gears meshing with each other. For this purpose, the gear pump includes introduction paths for introducing the fluid fro...	07/12/2011
7618247	Progressive staged flow to precompress the pump internal volume/volumes to be displaced Besides the conventional pump timing in rotary hydraulic devices, a series of constant and variable restrictions have been applied to condition the pressurized flow used to internally precompress the volume or volumes to be displaced. This multiple staged orifices f...	11/17/2009
7354260	Pneumatic motor including a rotor in a cylinder between two covers in a shell from which air travels into the cylinder through the covers A pneumatic motor includes a shell, two covers, a cylinder and a rotor. The shell defines a space, at least one inlet in communication with the space and at least one outlet in communication with the space. Each of the covers defines at least one radial channel and ...	04/08/2008
7241122	Internal gear pump with recesses on the gear bearing surfaces A positive-displacement pump, in particular for use in machines or dispensing fluids, including two elements that are with respect to one another and which mesh with one another (20, 30), each of them being rotatably mounted in the pump with centered coupling...	07/10/2007
7150612	Gear pump or motor A gear•rear shaft containing main body of a bottomed type is penetrated with a bearing hole and a rear face of the gear•rear shaft containing main body is coupled with a closing plate to form an airtight seal from an outside environment. Shafts extended from two...	12/19/2006
7048524	Internal gear pump with recesses on the gear bearing surfaces A positive-displacement pump, in particular for use in machines or dispensing fluids, including two elements that are with respect to one another and which mesh with one another (20, 30), each of them being rotatably mounted in the pump with centered coupling...	05/23/2006
6969242	Compressor To counter downstream oil infiltration through a shaft seal, a small portion of the compressed fluid is diverted from downstream to upstream through a passageway in a rotor. The diverted fluid is introduced to a space at a downstream side of the seal. An exemplary i...	11/29/2005
6964559	Two shaft vacuum pump with cantilevered rotors A vacuum pump (1) comprising a pump chamber casing (5) accommodating two co-operating rotors (2, 3) which are respectively arranged on a shaft (8, 9). A bearing/gear chamber (6) is disposed adjacent to the pump chamber casing (5...	11/15/2005
6945763	Geared pump with forced lubricated coupling A geared feed pump has a housing having a pump chamber in which a rotationally driven pair of gear wheels meshing with one another is disposed for pumping medium out of a suction chamber that communicates with a supply tank, along feed conduits, formed between the c...	09/20/2005
6905321	Rotary pump for braking apparatus In a rotary pump for a braking apparatus, a discharge trench is formed on an axial direction end surface of a second side plate that forms a mechanical seal. As a result, rotors are pressed back toward a side of a first side plate by a discharge pressure of brake fl...	06/14/2005
6769889	Balanced pressure gerotor fuel pump A gerotor pump for pressurizing gasoline fuel is capable of developing pressures up to 2.0 MPa with good mechanical and volumetric efficiency and satisfying the durability requirements for an automotive fuel pump. The pump has been designed with optimized clearances...	08/03/2004
6761547	Trochoid gear type fuel pump Two-inner gears are overlapped with each other through a partition wall and are eccentrically arranged at an inner peripheral side of an outer gear, and eccentric directions of both the inner gears are shifted from each other by 180° to the opposite side. By this, ...	07/13/2004
6554594	Shaft seal structure for vacuum pump A vacuum pump has a housing accommodating a rotary shaft and a gas transferring assembly driven by the rotary shaft. The housing has an exhaust passage for exhausting gas outside the housing. The gas transferring assembly creates a vacuum. A lip seal for ...	04/29/2003
6544013	Oil pump apparatus An oil pump apparatus includes an oil pump housing having a first suction port, a second suction port and a discharge port in the circumferential direction thereof. A shape of the end portion in the anti-rotational direction at the second suction port is ...	04/08/2003
6425748	Positive displacement rotary pump A positive displacement rotary pump including a housing having an internal chamber and inlet and discharge ports, a sealing land on the housing between a downstream end of the inlet port and an upstream end of the discharge port, and a rotating group in t...	07/30/2002
6312239	Screw-type compressor having an axial bearing part on only one rotor A screw-type compressor comprises a housing (12) in which a primary rotor (14) and a secondary rotor (16) are arranged each of which is provided with a shaft (18,24) and a screw rotor (20,26). The secondary rotor (16) is axially supported by the primary r...	11/06/2001
6241496	Hermetic rotary compressor The present invention relates to a hermetic rotary compressor. More particularly, since the conventional rotary compressor has problems that the effect of a surge recess for reducing noises due to pressure pulsation is insufficient, and it is impossible t...	06/05/2001
6086344	Hydraulic motor lubrication path A lubrication path in a gerotor motor extending in the face of the rotor or an adjoining surface from a gerotor cell having relatively high pressure to the central cavity of the device to provide cooling and lubrication fluid thereto....	07/11/2000
6062836	Gear pump A gear pump comprising two gearwheels moving in opposite senses, the gears whereof engage with one another and thus, separated from one another in a pressure-tight manner, form a delivery side and a suction side; a central plate wherein the gearwheels are...	05/16/2000
5711660	Internal gear type rotary pump having a relief groove Along a peripheral wall surface of a pump housing at a closure portion where a working fluid in a volume chamber defined by engagement of an inner rotor and an outer rotor, is enclosed, a liquid pressure is relieved by the liquid pressure relieving groove...	01/27/1998
5582514	Sickleless internal gear pump A sickleless internal gear pump with an internally toothed ring gear and a pinion meshing with the ring gear, the two fitted rotatably in a common casing. The ring gear includes radial conduits for the medium to be pumped and elements which are radially m...	12/10/1996
5466137	Roller gerotor device and pressure balancing arrangement therefor A roller gerotor device is disclosed including an outer rotor (39) and an inner rotor (31), and a plurality of rollers (37) serving as teeth. The device includes a housing means (11,45,47) defining a first wear surface (67) disposed axially adjacent first...	11/14/1995
5322427	Rotary-blade air conditioner compressor for heavy-duty vehicle A rotary blade air conditioner compressor is provided which includes a compressor housing having a cylindrical chamber. Chamber covers are mounted to respective ends of the cylindrical chamber. A reservoir is fluidly connected to an outlet and an inlet of...	06/21/1994
5318415	Grooved pump chamber walls for flushing fiber deposits A rotary lobe pump has a pair of rotary lobes rotatably mounted in a pump chamber having end walls perpendicular to axes of the lobes and a side wall with which the rotors making sealing contact. At least one of the end walls is provided with a shallow gr...	06/07/1994
5133651	Scroll compressor with a fluid thrust bearing A thrust bearing of a scroll compressor to be used as a fluid compressor for a refrigeration or air conditioning unit, is designed to resist the moment exerted on the orbiting scroll member, and tending to tilt the orbiting scroll member, so as to prevent...	07/28/1992
4983108	Low pressure container type rolling piston compressor with lubrication channel in the end plate A low pressure container type rolling piston compressor which includes a compression element, a motor element, a rotary shaft with an eccentric portion driven by the motor element, a cylinder for receiving therein the eccentric portion of the rotary shaft...	01/08/1991
4770617	Gear pump with leakage fluid intermittently communicated to expanding fluid cells A gear pump is disclosed which is adapted to convey a polymeric melt without significant leakage, and which comprises a pair of intermeshing gears. One of the gears is driven by a drive shaft which extends through a journal bore in the pump housing, and a...	09/13/1988
4743183	Rotary vane compressor with discharge fluid to front and rear shaft bearings and vane slats A first refrigerant gas passage is provided for conveying refrigerant gas under pressure to rearward ends of rotor vane slots through a rear bearing in order to supply back pressure to the rotor vane slots as well as to supply lubricant to the rear bearin...	05/10/1988
4411607	Internal gear machine with rotary pressure balanced valve disc A hydraulic internal gear machine includes a positive displacement unit for working liquid constituted by a rotary outer gear and an inner gear surrounding the outer gear and being in mesh therewith at one point to define a plurality of increasing liquid ...	10/25/1983
4402653	Rotary compressor A rotary compressor comprises an open-ended cylinder having its open ends closed by end plates and an eccentrically rotatable rotor housed inside the cylinder. A hydrodynamic seal is provided on either the rotor or each of the end plates for minimizing an...	09/06/1983
4376620	Seawater hydraulic vane-type motor A vane type hydraulic motor which is operable with seawater as the hydraulic fluid for undersea diver use. The motor is compact, lightweight and is lubricated by the seawater working fluid. The motor uses corrosion resistant materials with the requisite f...	03/15/1983
4308002	Wankel-type engine with semi-circular sectional configuration for chamber end surface A Wankel-type engine has a housing with a chamber therein having parallel, axially spaced side surfaces joined by an end surface which has a semi-circular contour in an axially longitudinal plane. A rotor, eccentrically mounted on a shaft carried by the h...	12/29/1981
4231728	Rotary vane pump An improved design for sealing and lubricating the moving parts of a rotary vane pump. An effectively operating lubricant distributing system is obtained in such a pump by forming radially extending passages through the pump drive shaft and attached rotor...	11/04/1980
4224014	Rotary compressor with liquid injection A rotor is journalled in a housing having gas inlet ports and outlet ports for compressed gas, the gas being compressed in working chambers formed between the rotor, an inner surface of the housing and vanes which periodically move inward and outward in s...	09/23/1980
4090820	Gear pump with low pressure shaft lubrication A gear pump is disclosed wherein the shafts of at least a pair of intermeshing gears are rotatably supported in bushings each with an axially extended lubrication groove formed in the bore of the bushing, one end of the lubrication groove being communicat...	05/23/1978

PatentStorm

Quotables

PatentStorm News

Class 418/79 - Radial groove