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Class Information
Number: 418/206.7
Name: Rotary expansible chamber devices > Interengaging rotating members > Like rotary members > Having each radial protuberance of like dimension > With bearings
Description: Apparatus comprising means to support, guide, and reduce the friction between moving parts.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8672657 Double gear pump with improved bearings Mar. 18, 2014
8636487 Dual stage pump having intermittent mid-shift load supports Jan. 28, 2014
8608465 Positive-displacement rotary pump having a positive-displacement auxiliary pumping system Dec. 17, 2013
8517707 Method for converting energy from compressed air into mechanical energy and compressed air motor therefor Aug. 27, 2013
8439661 Power take-off for compressors May. 14, 2013
8430657 Pump having modular shaft bearings and seals Apr. 30, 2013
8348650 Root pump Jan. 8, 2013
8303281 Gear type performance oil pump Nov. 6, 2012
8215937 Fluid machine with divided housing Jul. 10, 2012
8181624 Open-cycle internal combustion engine May. 22, 2012
8007264 Positive displacement pump apparatus and method Aug. 30, 2011
7905717 PD pumps with a common gearbox module and varying capacities and easy access to mechanical seals Mar. 15, 2011
7878783 Gear pump with components constructed as a homogenous workpiece Feb. 1, 2011
7789642 Gear pump and method of producing the same Sep. 7, 2010
7607906 Gear pump arrangement with erosion resistant insert Oct. 27, 2009
7588431 Variable capacity pump/motor Sep. 15, 2009
7455507 Structure for preventing cavitation erosion of oil pump Nov. 25, 2008
7179070 Variable capacity pump/motor Feb. 20, 2007
7144234 Flanged gear pump Dec. 5, 2006
6997689 Offset bearing for extended fuel pump life Feb. 14, 2006
6902382 Gear motor start up control Jun. 7, 2005
6761546 Gear pump having bearings with cooling ducts Jul. 13, 2004
6716010 Bearing arrangement Apr. 6, 2004
6705847 Rotary displacement machine having at least two annular displacement gears and supply channels Mar. 16, 2004
6692244 Hydraulic pump utilizing floating shafts Feb. 17, 2004
6575720 Bearing and shaft cooling device Jun. 10, 2003
6537048 Pump body for a medical gear pump Mar. 25, 2003
6524088 Gear pump having a bearing with a temperature adjusting medium passage Feb. 25, 2003
6454552 Fluid mover Sep. 24, 2002
6309199 Assemblies for modular fluid pump Oct. 30, 2001
6217305 Screw pumps Apr. 17, 2001
6213745 High-pressure, self-lubricating journal bearings Apr. 10, 2001
6183231 Clean-in-place gear pump Feb. 6, 2001
6095781 Timed element, high pressure, industrial rotary lobe pump Aug. 1, 2000
6010321 Rotary mower spindle and hydraulic motor Jan. 4, 2000
5924854 Gear pump channel arrangement for tempering media Jul. 20, 1999
5810571 High performance oil pump Sep. 22, 1998
5702234 Fluid pump with bearing set having lubrication path Dec. 30, 1997
5692888 Gear train mechanism having reduced leakage Dec. 2, 1997
5641281 Lubricating means for a gear pump Jun. 24, 1997
5505591 Apparatus for processing materials Apr. 9, 1996
5391068 Gear pump Feb. 21, 1995
5334097 Toroidal type continuously variable transmission supported by a common bearing and reaction stationary shaft Aug. 2, 1994
5120206 Gear metering pump for compounded elastomeric material Jun. 9, 1992
4986740 Mechanical supercharger having a thrust bearing Jan. 22, 1991
4917583 Bearing support for a twin-shaft pump Apr. 17, 1990
4886437 Bearing arrangement of an external-axial rotary piston blower Dec. 12, 1989
4846641 Readily-removable floating bushing pump construction Jul. 11, 1989
4797078 Bearing arrangement of an external-axial rotary piston blower Jan. 10, 1989
4728273 Rotary piston compressor Mar. 1, 1988

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