Patents by Inventor Wade Gehlhoff

Wade Gehlhoff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20160146165
    Abstract: An air intake arrangement for an air intake system for an engine includes a first pre-cleaner arrangement having a housing with an air flow inlet to receive air to be pre-cleaned. A pre-cleaner region is constructed and arranged to remove at least some particulate from the inlet air. The first pre-cleaner arrangement further includes a vacuum flow path and a drop tube flow path. The vacuum flow path is in air flow communication with a first vacuum source to selectively put a vacuum draw through the pre-cleaner region. The drop tube flow path is in air flow communication with a drop tube to eject particulate removed from the inlet air by the pre-cleaner region.
    Type: Application
    Filed: June 27, 2014
    Publication date: May 26, 2016
    Inventors: Wade GEHLHOFF, Steven GIESEKE, Wenliang ZHOU, Michael LI, Gao Aaron HUA
  • Patent number: 9037272
    Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: May 19, 2015
    Assignee: Eaton Corporation
    Inventors: QingHui Yuan, Christy Schottler, Wade Gehlhoff, Hong Singhania
  • Publication number: 20130297045
    Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.
    Type: Application
    Filed: July 11, 2013
    Publication date: November 7, 2013
    Inventors: QingHui Yuan, Christy Schottler, Wade Gehlhoff, Hong Singhania
  • Patent number: 8527073
    Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: September 3, 2013
    Assignee: Eaton Corporation
    Inventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
  • Publication number: 20120303141
    Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.
    Type: Application
    Filed: August 6, 2012
    Publication date: November 29, 2012
    Applicant: Eaton Corporation
    Inventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
  • Patent number: 8239069
    Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.
    Type: Grant
    Filed: June 11, 2009
    Date of Patent: August 7, 2012
    Assignee: Eaton Corporation
    Inventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
  • Publication number: 20090312852
    Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.
    Type: Application
    Filed: June 11, 2009
    Publication date: December 17, 2009
    Inventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
  • Publication number: 20070227599
    Abstract: A fluid controller (15a) in a multiple-input hydrostatic power steering system includes a check valve assembly (101), having a first fluid passage (111), defining a check valve seat (105) and a check valve (103) operably associated therewith, in fluid communication with a second fluid passage (109), with the second fluid passage (109) being in fluid communication with a return port (25a). In the left (L) and right (R) operating positions, return flow can flow from the interior region (114) of the valve (27), through the first fluid passage (111), past the check valve (103), and through the second fluid passage (109) to the return port (25a). In the neutral position (N), pressurized fluid can flow from an inlet port (19a) to the return port (25a), with the check valve (103) preventing fluid from flowing through the first fluid passage (111) and into the interior region (114) of the valve (27).
    Type: Application
    Filed: March 31, 2006
    Publication date: October 4, 2007
    Inventor: Wade Gehlhoff
  • Publication number: 20070079881
    Abstract: A fluid controller (17) controls a main fluid path (18) from a pump (11) to a primary steering cylinder (19) and a second fluid path (26) from a fluid meter (37) to a second cylinder (31). A mechanical or electrical linkage (149) couples the primary steering cylinder (19) to the second cylinder (31) such that displacement of the primary cylinder (19) results in proportional corresponding displacement of the second cylinder (31). The main fluid path (18) and the second fluid path (26) are maintained separate from each other. As such, the main fluid path (18) provides pressurized fluid from the pump to the primary steering cylinder (19) without communicating main fluid flow to the secondary cylinder (31). Due to the separate fluid paths, the present invention can be used to provide a substantial amount of fluid through a fluid controller (17) with a relatively small displacement fluid meter (37).
    Type: Application
    Filed: October 7, 2005
    Publication date: April 12, 2007
    Inventor: Wade Gehlhoff
  • Publication number: 20060248883
    Abstract: A hydraulic control system including a source (11) of fluid having a pressure responsive means (15) and an actuator. A main control valve (21) has ports (27, 29) communicating with the actuator ports by means of first (41) and second (43) conduits, and means to generate a load pressure (45). A pressure spike suppression valve (51) has ports connected across the conduits, the valve including a spool (65) moveable between a first position blocking communication between the ports, and a second position permitting communication. The valve (51) defines a spring chamber (67) including a spring (69) biasing the spool toward the first position. The valve defines a load signal passage (83) to communicate the load pressure to a chamber also to bias the spool toward the first position. The valve defines a pressure chamber (81) in communication with the source, fluid pressure therein biasing the spool toward the second position.
    Type: Application
    Filed: May 9, 2005
    Publication date: November 9, 2006
    Inventor: Wade Gehlhoff