Xingen D Dong

6743003, Jun 1, 2004

Apr 29, 2003

10/426079

Xingen Dong - Greeneville TN

Parker-Hannifin Corporation - Cleveland OH

F01C 110

418 613, 418186

A rotary fluid pressure device having a housing member, a manifold assembly, a gerotor set, an end plate, and a rotatably journaled torque transfer shaft interconnected with the gerotor set and extending within the housing member and manifold assembly. The gerotor set having an internally toothed stator member and a rotating rotor member disposed within the stator member. The rotor member having a first and second axial end surface and external teeth which interengage with the internal teeth of the stator to define a plurality of expanding and contracting volume chambers. The rotor member also having a first plurality of circumferentially spaced laterally directed fluid paths which extend through the rotor for fluid connection between the manifold assembly and the volume chambers, and a second plurality of circumferentially spaced, laterally directed fluid paths interposed between the first plurality of fluid paths for sequentially channeling fluid between both axial end surfaces.

6783339, Aug 31, 2004

Dec 30, 2002

10/331898

Xingen Jeffrey Dong - Greeneville TN
Brad P. Shupe - Greeneville TN

Parker Hannifin Corporation - Cleveland OH

F03C 208

418 613, 418104, 418142

A hydraulic motor ( ) comprising a front housing ( ) which includes a first port ( ) and a second port ( ), a drive assembly ( ), a drive link ( ), and a shaft ( ). The front housing ( ) and the drive assembly ( ) form a central bore ( ) in which the drive link ( ) and the shaft ( ) are rotatably mounted. The drive assembly ( ) comprises a spool valve ( ) rotatably positioned within the central bore ( ) and coupled to the shaft ( ) by a key ( ). Sealing rings ( ) having a rotationally incompatible geometry (e. g. , waved shapes) are used to seal interface surfaces of the rotor ( ) and a high pressure seal assembly ( ) is used to seal the front of a fluid chamber ( ).

6793472, Sep 21, 2004

May 8, 2003

10/434249

Xingen Dong - Greeneville TN

Parker-Hannifin Corporation - Cleveland OH

F01C 110

418 613

A hydraulic device for one of a motor and pump, having a manifold assembly positioned between a gerotor set and a housing for the device, the manifold assembly adapted for conducting pressurized fluid to the gerotor set and conducting exhaust fluid from the gerotor set. The manifold assembly having a first axial end, a second axial end, a central internal bore extending freely from the first axial end to the second axial end and adapted for conducting at least a portion of one of the fluids, a first fluid passage extending directly from the central internal bore to a location radially outward from the central internal bore and therefrom to the second axial end, and a second fluid passage extending substantially laterally from the second axial end to the first axial end.

6837047, Jan 4, 2005

Jun 10, 2003

10/457936

Xingen Dong - Greeneville TN, US
James S. Whitaker - Greeneville TN, US

Parker-Hannifin Corporation - Cleveland OH

F16D 3102

60464, 13711806, 137114

A hydraulic valve assembly, for use in a hydrostatic transmission, for controlling fluid transfer between a first, a second and a third line, wherein two of the lines define first and second pressure lines, within a closed-loop circuit. The valve assembly comprises: a valve body having ports in communication with the three lines; a spool bore; a valve spool, adapted for sealing reciprocation within the spool bore, having a first and second end portion, a connecting portion, and a first and second bypass orifice within the valve spool; and dampers for centering the valve spool. This spool is movable from a neutral position occurring when the fluid pressure forces in the first and second pressure lines are substantially similar, to a first or a second position occurring when the fluid pressure force in the first pressure line is greater or less than that in the second pressure line, respectively. The bypass orifices are enabled in the neutral position, but are substantially disabled in the first and second positions. A hydraulic system utilizing the valve assembly and a method for increasing the width of the dead band of the hydrostatic transmission in a neutral mode of operation are also set forth.

6932587, Aug 23, 2005

May 8, 2003

10/434241

Xingen Dong - Greeneville TN, US

Parker-Hannifin Corporation - Cleveland OH

F01C001/10
F03C002/00

418 613, 418 75, 418186

A rotary fluid pressure device having a housing member, a manifold assembly, an internally generated rotor type gerotor set, an end plate, and a rotatably journaled torque transfer shaft interconnected with the gerotor set and extending within the housing member and manifold assembly. The gerotor set having at least an internally toothed stator member and a rotating rotor member disposed within the stator member. The rotor member having a first and second axial end surface and external teeth which interengage with the internal teeth of the stator to define a plurality of expanding and contracting volume chambers. The rotor member also having a plurality of circumferentially spaced laterally directed fluid paths fluidly connecting the manifold assembly with a plurality of circumferentially spaced radiating fluid paths which directly connect with the volume chambers. The fluid pressure device further including a plurality of coupling members for interconnecting the components.

7107892, Sep 19, 2006

Mar 17, 2004

10/802278

Xingen Dong - Greeneville TN, US

Parker-Hannifin - Cleveland OH

F01B 31/18

92 122, 92 86

In a variable displacement hydraulic pump having a housing with a multiplicity of interconnected surfaces, including opposed end surfaces and intermediate side surfaces, the improvement comprising the location of at least one case drain orifice in each of a plurality of differing ones of the surfaces in a manner such that at least one of the orifices is located in the vicinity of the top surface of the housing in any spatial orientation of the housing.

7234385, Jun 26, 2007

Jul 21, 2005

11/186411

Xingen Dong - Farmington CT, US
Frank P. Holzschuh - Greeneville TN, US
Allen Burdette - Johnson City TN, US

Parker-Hannifin Corporation - Cleveland OH

F01B 3/02

92 122

A speed adjusting mechanism that includes a return to neutral feature for returning a control member of a pump to neutral after the control member has been moved to a forward or reverse position. The speed adjusting mechanism is characterized by the use of a torsion spring that enables the mechanism to be composed of just a few parts.

7255544, Aug 14, 2007

Oct 22, 2004

10/972171

Xingen Dong - Greeneville TN, US
Barun Acharya - Johnson City TN, US

Parker-Hannifin - Cleveland OH

F03C 2/00
F03C 4/00
F04C 2/00

418 613, 417391, 417440

A housing for a motor having fluid passages integrated within. The passages include a first passage for receiving a fluid from outside the motor, a second passage for directing the fluid away from the motor, and at least one other passage from conveying the fluid to a set of components attached to the motor housing. The housing has at least one relief valve positioned within the fluid passages for diverting a portion of the fluid directly from the first passage to the second passage.