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| Number | Title | Issue Date |
| 7967585 | Method for manufacturing trochoid pump and trochoid pump obtained The present invention enables the manufacture of a trochoid pump having a crescent which has been considered theoretically impossible by employing an inner rotor of a trochoid pump. An inner rotor having a predetermined number N of teeth that is equal to or larger t... | 06/28/2011 |
| 7967586 | Method for manufacturing trochoid pump and trochoid pump obtained The present invention enables the manufacture of a trochoid pump having a crescent which has been considered theoretically impossible, by employing an inner rotor of a trochoid pump. An inner rotor having a predetermined number N of teeth that is equal to or larger ... | 06/28/2011 |
| 7766634 | Crescent gear pump with novel rotor set A novel crescent gear pump and pump rotor set for a crescent gear pump. The rotor set includes an outer rotor with teeth having a composite profile formed over the portion adjacent their root to conform to a circular arc and formed over the portion adjacent their ti... | 08/03/2010 |
| 7625192 | Internal gear pump including a crescent To provide an internal gear pump capable of preventing small vibrations due to pressure differences at the outlet port side of a crescent disposed between the outer rotor and the inner rotor, so that fatigue failure does not occur in the crescent over a long time pe... | 12/01/2009 |
| 7334495 | Resin gear and rotational power transmission member of resin There is provided a resin gear 1 capable of improving the strength of a key receiving portion, which is engageable with a key of a driving shaft, to prevent the key receiving portion from being broken by external force applied during rotation. In the resin ge... | 02/26/2008 |
| 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 |
| 7185625 | Rotary piston power system The rotary piston power system includes a housing having a drum and a cover rotatably mounted on the drum. The drum has high pressure and low pressure ports defined in its peripheral wall and a central separator wall having arcuate end faces and a pair of semicylind... | 03/06/2007 |
| 7118359 | Oil pump rotor An oil pump rotor assembly for an oil pump which enables reduction of noise while preventing pump performance and mechanical efficiency from being degraded. In this oil pump rotor assembly, the tooth tip profile of each of at least one of external teeth of an inner ... | 10/10/2006 |
| 7111606 | Rotary positive displacement device A device to convert energy having exterior and interior rotors where the number of legs (Λ) of an interior rotor divided by the number of chambers (X) defined by the fins of the outer rotor is equal to the effective radius of the inner reference circle ri | 09/26/2006 |
| 7074025 | Fluid delivery device A fluid delivery device, such as a geared machine or a gear pump, with a housing having at least one supply chamber and a displacement unit arranged within the supply chamber. The displacement unit serves to supply a medium to at least one pressure chamber provided ... | 07/11/2006 |
| 7014436 | Gear pump A pump comprises a driving rotor and a driven rotor that are positioned in a housing such that, as the driving rotor and the driven rotor rotate, the teeth of the driving rotor and the teeth of the driven rotor mesh to form a positive displacement seal. The teeth of... | 03/21/2006 |
| 6907855 | Geroter type internal combustion engine An internal combustion engine including a housing, an intake port defined in the housing, an exhaust port defined in the housing, and a generally cylindrical combustion chamber defined in the housing. The combustion chamber communicates with the intake port and the ... | 06/21/2005 |
| 6817843 | Ball check air vent for transmission pump A pressure-relieving valve is connected to relieve air pressure from an internal diameter of a transmission pump. On startup, pressurized oil is delivered to the torque converter. At engine idle speed, the centrifugal effects on the oil cause any air (which may have... | 11/16/2004 |
| 6764283 | Internal gear wheel pump An internal gear pump for pumping fuel from a suction conduit (18) into a pressure conduit (19) has a pump housing (1) in which an internal ring gear (5) and an externally toothed pinion (3), the latter driven by a drive shaft (... | 07/20/2004 |
| 6672850 | Torque control oil pump with low parasitic loss and rapid pressure transient response A torque control crescent oil pump, having low parasitic loss and rapid pressure transient response, and a method for controlling oil flow within the pump, are provided. In one embodiment, the crescent oil pump comprises a housing, toothed annular gears c... | 01/06/2004 |
| 6659748 | Axial compensation in an inner geared pump for a closed circuit An internal geared machine capable of forward and reverse operation in a closed circuit having a pinion and an internal toothed ring gear meshing with the pinion and disposed in a housing. A filling comprising two identical filler pieces fills a sickle-sh... | 12/09/2003 |
| 6652253 | Hydraulic pump having a noise reduction recess An internal/external gear pump includes a wear plate disposed between the gear members and at least one sidewall of the pump. The wear plate has a recess formed therein having a substantially constant depth and width. The recess extends into the full mesh... | 11/25/2003 |
| 6450792 | Hydraulic displacement machine The invention relates to a displacement machine, in particular a displacement pump used in an automobile and having two components movable slidably relative to one another. In order to keep the wear on the components low, even in the case of a poorly lubr... | 09/17/2002 |
| 6425747 | Gearing with mating internal and spur gears A gearing, particularly for use in a gear pump which can be utilized in the power train of a motor vehicle, has a housing, a rotary internal gear in the housing, and a spur gear driven by a prime mover, mating with the internal gear and defining with the ... | 07/30/2002 |
| 6419471 | Internal gear machine for reversed operation in a closed hydraulic circuit The invention relates to an internal gear machine for reversed operation in a closed circuit comprising an outer-toothed pinion, an inner-toothed ring gear meshing with the pinion; a housing; a filing that fills the sickle-shaped space between the pinion ... | 07/16/2002 |
| 6345968 | Hydraulic motor with brake assembly A hydraulic device includes a housing enclosing a hydraulic motor having a wobble shaft driven by a rotor of a gerotor gear set. An outer end of the wobble shaft is connected to the inner end portion of an output shaft. The output shaft extends axially th... | 02/12/2002 |
| 6314642 | Method of making an internal gear pump An improved internal gear pump design is provided whereby the head plate includes a groove located vertically above the crescent for providing improved axial feed to the roots or innermost spaces between the idler teeth. The design of the pump also includ... | 11/13/2001 |
| 6293777 | Hydraulic positive displacement machine A hydraulic positive displacement machine has rotating conveying elements whose end faces are sealed by pressure plate. This pressure plate is loaded by a control valve with hydraulic pressure in order to adjust the size of the sealing gap. The control va... | 09/25/2001 |
| 6227833 | Fluid machine having cooperating displacement elements and a housing partially covering the displacement elements There is disclosed a hydraulic or pneumatic machine having a first displacement element (8) that is rotatable about an axis of rotation connected to a shaft (10) so as to rotate therewith, which shaft is mounted rotatably in a housing (2), and co-operates... | 05/08/2001 |
| 6183229 | Hydraulic apparatus The invention is embodied in a hydraulic gear machine, such as for example a pump or motor, with at least one multistage pressure building slot in an axial plate of the housing. The slot is designed to facilitate a gradual rise of fluid pressure between t... | 02/06/2001 |
| 6179595 | Hydraulic gear machine having a transmission shaft in a bearing tube A hydraulic gear machine, particularly an internal-gear pump in a vehicular transmission, with an internal gear and an external gear, has a central bearing tube that rotatably supports the external gear and receives the input or output shaft of the transm... | 01/30/2001 |
| 6149415 | Internal gear pump having a feed groove aligned with the roots of the idler teeth An improved internal gear pump design is provided whereby the head plate includes a groove located vertically above the crescent for providing improved axial feed to the roots or innermost spaces between the idler teeth. The design of the pump also includ... | 11/21/2000 |
| 6089841 | Crescent gear pump A crescent pump including a housing having an inlet port and a discharge port, a driving gear, and a driven gear meshing with driving gear in a gap between the inlet and the discharge ports. External and internal troughs on the driving and the driven gear... | 07/18/2000 |
| 5951274 | Internal-gear machine An internal-gear machine comprises a casing with an internally toothed annular gear rotatable therein, an externally toothed pinion engaged with the annular gear and a filling member between the annular gear and the pinion. The filling member is subdivide... | 09/14/1999 |
| 5785510 | Gear pump having members with different hardnesses An improved gear pump having members with different hardnesses includes a housing defining an internal bore with inlet and outlet passageways. A head member includes a wall between the inlet and outlet passageways and extends toward a toothed rotor. A too... | 07/28/1998 |
| 5782623 | Internal toothed belt pump The invention relates to an internal toothed belt pump, in particular an internal toothed belt pump which is self-priming and can deliver and meter also non-lubricant fluids at a controlled pump speed and medium pressure.... | 07/21/1998 |
| 5755565 | Rotary pump having reinforcing wall in a passage A pump has inner and outer gears, suction and discharge passages, and a reinforcing member arranged in at least one of openings of the suction and discharge passages, the reinforcing member reinforcing a wall between the at least one opening and an inner ... | 05/26/1998 |
| 5692888 | Gear train mechanism having reduced leakage A gear train mechanism includes a housing having side walls that are made of a material exhibiting a modulus of elasticity of at least 140 GPa. A pair of shafts is supported by slide bearings in the housing and exhibit a length of at least of 1.3 times th... | 12/02/1997 |
| 5690481 | Internal-gear machine having a divided filling portion Described is an internal-gear machine (10) comprising a casing (12, 80) in which there are provided an internally toothed annular gear (20), an externally toothed pinion (24) in engagement therewith, and a filling portion (28) which is divided into two in... | 11/25/1997 |
| 5660531 | Gear pump with minimized canitation The invention relates to a gear pump with two delivery gears meshing with one another, said gears cooperating in the rotation direction in front of or behind a plane containing the gear axes with a pressure and/or suction line. According to the invention,... | 08/26/1997 |
| 5605451 | Fluid apparatus of an internal gear type having defined tooth profiles A fluid apparatus of an internal gear type comprising an internal gear 3 rotatively mounted in a housing 1, an external gear 5 meshing with said internal gear 3, and a crescent partition piece disposed between the both gears, each tooth profile of said bo... | 02/25/1997 |
| 5499910 | Internal gear pump having a stop for a sickle-shaped filler part Internal gear pump with an internal gear, a thrust plate arranged on each side of the internal gear, a powered external pinion arranged eccentrically relative to the internal gear and meshing with it, and a sickle-shaped, floating filler part split in per... | 03/19/1996 |
| 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 |
| 5360325 | Gear pump with reduced fluid-borne noise A crescent internal gear pump achieves greatly improved sealing against cter flow of fluid and greatly reduced noise by increase of the number of teeth of each of the ring and pinion gears which form discrete volumes of pumped fluid against a crescent-sh... | 11/01/1994 |
| 5314319 | Hydraulic pump for a vehicle engine A hydraulic pump in the form of an oil pump for a vehicle engine has both its pinion, which is driven by the engine's crankshaft, and a ring-gear, which cooperates with the pinion, incorporated in an end-cover fastened to the end of the engine block. A ca... | 05/24/1994 |
