| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 418075000 | GROOVED ABUTTING CYLINDER-ROTATING MEMBER END SURFACES | 14 |
| 20080253913 | Vane Pump - The invention relates to a vane pump comprising a rotor which is arranged therein, rotatably driven by a drive shaft. The rotor is provided with several grooves which are distributed through the circumference thereof and which extend substantially radially with respect to the axis of rotation of the rotor. In each groove a blade-shaped conveying element is slidingly guided. The end walls of the pump housing are adjacent to the rotor in the direction of the axis of rotation thereof. At least one ring-shaped groove surrounding the axis of rotation of the rotor is embodied in at least one front side of the rotor. The ring-shaped groove is connected to lower areas restricted by the blades in the grooves of the rotor, and to pressure areas. In a preferred embodiment, the ring-shaped groove is formed in the rotor by shaping. | 10-16-2008 |
| 20100266436 | FUEL PUMP - A fuel pump includes an impeller and a cover. The impeller includes a ring portion, which is annular and is placed radially outward of blades. The cover has an arcuate pump flow passage. An enlarged space is formed in a cover side slide surface of the cover. The enlarged space is communicated with the pump flow passage and has an axial gap size, which is axially measured between an axial bottom surface of the enlarged space and an axial end surface of the ring portion and is larger than that of an axial slide gap between the slide surface and the axial end surface of the ring portion. | 10-21-2010 |
| 20110076173 | ROTARY COMPRESSOR AND MANUFACTURING METHOD OF THE SAME - There is disclosed a rotary compressor which delays a pressure rise on a high pressure chamber side in a cylinder of a rotary compression element to decrease a high pressure load applied to a roller and a rotary shaft, thereby improving performance. In the rotary compressor including a sealed container in which an electromotive element (a driving element) and first and second rotary compression elements driven by a rotary shaft of the electromotive element are included, each of the rotary compression elements being constituted of a cylinder, a roller fitted into an eccentric portion formed on the rotary shaft to eccentrically rotate in the cylinder, and a vane which abuts on the roller to partition the inside of the cylinder into a low pressure chamber side and a high pressure chamber side, the inner diameter of a suction passage formed in each cylinder is 59% or more and 70% or less of the thickness of the cylinder. | 03-31-2011 |
| 20120201708 | DRY SCREW DRIVER - An embodiment of a dry screw compressor has a male rotor at a peripheral speed lower than approximately 80 m/s. The compressor includes: a casing body having an inlet for a gaseous fluid to be taken in and at least an outlet for the compressed fluid; at least a male rotor and at least a female rotor meshed together, said rotors being arranged inside said casing body whereby the ratio between the length and the external diameter of the male rotor is higher than or equal to approximately two, and the winding angle of the male rotor is smaller than or equal to approximately 300°. | 08-09-2012 |
| 418077000 | Grooved working member surface | 3 |
| 20080219873 | Vane pump - A vane pump includes a rotor chamber; a rotor eccentrically accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor, and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. An engaging portion is formed in a peripheral end portion of a thrust surface of the rotor and an engaged portion with which the engaging portion engages in a non-contact state is formed in an inner surface region of the rotor chamber facing the thrust surface of the rotor in a non-contact state. | 09-11-2008 |
| 20090068049 | ROTARY EQUIPMENT AND OIL PUMP - An oil pump has: a base part having a working chamber; and a rotor provided rotatably in the working chamber. The base part is configured by a plurality of split bodies. At least one of the plurality of split bodies is made of aluminum alloy, and on which an opposed sliding surface made of a ceramic film is formed. The ceramic film of the opposed sliding surface has a hardness of approximately Hv 500 to 1100 and a surface roughness of approximately 2 to 8 micrometers, and contains α-alumina and zirconia. | 03-12-2009 |
| 20100008809 | CONVEYING UNIT - A pumping unit having a pump chamber in which a rotor is mounted in a rotatable manner, and which is formed by a circumferential wall and two end walls, is already known. The circumferential wall is formed on an annular collar of a pump part and, on the inside, forms a track on which sealing bodies of a rotor roll. The track of the pump chamber is subjected to high compressive loading which, if the pump part is made of plastic, may result in the track rupturing. In the case of the pumping unit according to the invention, the pump part is improved in respect of strength and service life. Deformation of the pump part by hydraulic forces or by pressing-in forces is avoided. The invention provides that ribs are arranged on the outside of the circumferential wall, the outside being directed away from the pump chamber, or that arranged on that side of the end wall which is directed away from the pump chamber is at least one shoulder which is connected in a force-fitting manner, by means of a press fit, to the pump housing and is designed with thin walls to the extent where the pressing forces do not result in any deformation to the end wall of the pump chamber. | 01-14-2010 |
| 418079000 | Radial groove | 1 |
| 20160108916 | ROTOR AND ROTARY FLUID MACHINE - First closing member and second closing member close opening portions at both ends of cylindrical member in an axial direction. Base is housed in a space formed by cylindrical member, first closing member, and second closing member, and rotates around an axis in the same direction as the axial direction of cylindrical member. Resin layers are formed on thrust surfaces of base. Groove C is a plurality of concentric circular grooves or a spiral groove formed on each resin layer, and the center of circles of the circular grooves or the center of a spiral of the spiral groove is different from the rotation center of base. | 04-21-2016 |
| 418080000 | Radially spaced grooves | 2 |
| 20090175750 | VARIABLE DELIVERY VANE OIL PUMP, IN PARTICULAR FOR OIL - A variable delivery vane pump, in particular for oil, is provided with a stator ( | 07-09-2009 |
| 20100047102 | GEAR PUMP WITH REDUCED PRESSURE PULSATIONS ON THE PUMPING SIDE - The invention relates to a gear pump in which the amplitudes of the pressure impulses in a pressure chamber can be significantly reduced by a suitable embodiment of a first groove and/or a second groove. The circumferential walls of a pump chamber containing the pressure chamber, in an angular range extending toward the pressure chamber, each have a respective groove communicating with the pressure chamber, by which grooves a radial spacing between the outer circumference of two gear wheels disposed in the pump chamber and the circumferential walls is increased. | 02-25-2010 |
| 418081000 | Annular groove or recess completely encircles rotation axis | 2 |
| 20090291010 | VANE PUMP - The vane pump has a housing containing a rotor driven by a drive shaft. A number of grooves are distributed over the rotor circumference and extend in a substantially radial direction of the rotor, in each of which grooves a wing-shaped delivery element is guided in sliding fashion. The rotor is surrounded by a circumferential wall that extends eccentrically in relation to its rotation axis against which the radially outer ends of the delivery elements rest. Housing end walls of the pump housing adjoin the rotor in the direction of its rotation axis. An annular groove encompassing the rotation axis of the rotor is provided in at least one of the housing end walls and is situated opposite the radially inner regions of the grooves of the rotor and communicates with the pressure region via a connecting groove in the housing end wall. The connecting groove extends from the pressure region radially inward in the rotation direction of the rotor to the annular groove. | 11-26-2009 |
| 20120263616 | FLUID POWER HELICAL ROTARY ACTUATOR - A fluid-powered, helical rotary actuary is provided. The actuary includes a housing, a shaft with output ends positioned in the housing, and a piston sleeve surrounding the shaft and also positioned within the housing. The shaft includes a groove for receiving a collar. The collar creates a false shoulder such that the shaft is able to have the same diameter along the length of the shaft, thus allowing for a larger working area and more torque output density. The actuary also includes a support ring positioned on the shaft near the splined portion of the output end. The support ring is used to stabilize the attachment of an external member, and also to protect the shaft from damage caused by the splined receiving portion of the external member, or hub. | 10-18-2012 |
| 418082000 | Groove communicates with vane slot | 2 |
| 20080219874 | VARIABLE DISPLACEMENT VANE PUMP - A variable displacement vane pump includes a pump body, a rotor, an annular cam ring, a rear body closing the pump body, a low pressure supply passage constantly connecting the inlet passage and the other of the first fluid pressure chamber and the second fluid pressure chamber, a low pressure introduction port formed in the other of the pressure plate and the rear body, and opened in the other of the first fluid pressure chamber and the second fluid pressure chamber, and a low pressure introduction passage formed in the other of the pressure plate and the rear body, the low pressure introduction passage connecting the low pressure introduction port and the inlet side vane back pressure grooves. | 09-11-2008 |
| 20160090984 | VANE PUMPS - A rotor for a pump includes a rotor body, an undervane cavity defined in the rotor body configured to accept an underside of a vane, an outer surface on a periphery of the rotor body for defining overvane cavities within a liner as a function of an inner cammed surface of the liner, and a pressure balance aperture defined in the rotor body fluidly connecting the undervane cavity to at least one of the outer surface. | 03-31-2016 |
