Patents Assigned to Cummins Engine
  • Patent number: 5410995
    Abstract: In accordance with preferred embodiments of the invention, a disc-shaped contact pad of ceramic material is disposed within a recess formed in the top surface of a metal valve crosshead. The pad is held in the recess by a retainer that clips onto the crosshead. The retainer is designed to maintain only a light pressure on only a narrow shoulder of the pad to keep it seated, and does not, itself, experience any dynamic loading. Furthermore, by the provision of a circumferential clearance between the pad and both the wall of the crosshead recess and the retainer, the need for precision machining of the ceramic material can be avoided. Additionally, a reduction of frictional sliding forces imposed on the crosshead, and in turn upon the valves, by the rocker lever is achieved by the ceramic pad, so that resultant frictional side loading is not imposed on adjacent valve components to a significant extent.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: May 2, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Joseph C. Bentz, John T. Carroll, III, Katsuhiro Shinosawa
  • Patent number: 5411003
    Abstract: A viscosity sensitive, pressure divider arrangement for use as part of an engine timing control tappet system where that system includes a block oil pressure supply, hydromechanical control valve and an oil sump, the pressure divider arrangement including an inlet chamber, a divider chamber and an exit chamber. The inlet chamber is connected to the divider chamber by means of a first connecting conduit having a relatively short length. The outlet side of the divider chamber is connected with the exit chamber by means of a second connecting conduit which has a length substantially longer than the length of the first connecting conduit. Additionally, the divider chamber includes a pressure-assist outlet aperture which is in flow communication with the hydromechanical control valve. The viscosity of oil flowing into the pressure divider arrangement will be acted upon by the combination of connecting conduits wherein the first connecting conduit is less viscosity sensitive than is the second connecting conduit.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: May 2, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Walter W. Eberhard, John J. McCosby, Paul D. Free, Jerome M. Long, David A. Olson
  • Patent number: 5409165
    Abstract: A highly wear-resistant plunger assembly for a fuel injector, particularly an open nozzle fuel injector, is provided. The wear-resistant plunger assembly of the present invention includes components formed from wear-resistant materials specifically including, but not limited to, ceramics and metals capable of withstanding the high temperatures and frictional forces produced by prolonged motoring and other potentially adverse engine operating conditions. Different portions of the plunger assembly may be formed from different kinds of wear-resistant materials.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: April 25, 1995
    Assignees: Cummins Engine Company, Inc., Toshiba Corp.
    Inventors: John T. Carroll, III, Katsuhiro Shinosawa, Lester L. Peters, Jeffrey L. Campbell, Joseph C. Bentz
  • Patent number: 5406795
    Abstract: An internal combustion engine has a turbocharger inlet flange mounted to the outlet flange of the exhaust manifold of the engine. The exhaust gas flow out of the manifold is through two ports having a centrally located guide wall directing flow from the manifold out the flange into the turbocharger inlet. The two ports are trapezoidal in shape with a short common dividing wall which, for each port, blends at a short radius into two diverging straight walls, one at each end of the common wall, and which blend from their ends into the outer wall of the port, resulting in trapezoidal port shape. The inlet flange of the turbocharger casing has ports matching and in registry with the two ports of the exhaust manifold flange.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: April 18, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Jonathan H. Raub, Glenn L. Baker
  • Patent number: 5404855
    Abstract: A variable displacement high pressure pump having a plurality of high pressure pumping units which receive fuel from a low pressure fuel pump. A rotary cam-driven roller tappet, for producing pumping displacement of the pumping plunger of a respective pumping element, is connected to the pumping plunger by a separated link in a manner permitting the pumping plunger to float relative to the roller tappet during at least a portion of each pumping cycle. As a result, the capacity of the pumping chamber can be limited to an extent that is less than the full stroke achievable by the pumping plunger being retracted to the maximum extent which is permitted by the driving cam.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: April 11, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Bai-Mao Yen, Lester L. Peters, Julius P. Perr, Bryan W. Swank
  • Patent number: 5402643
    Abstract: An oil drain tube disposed and connected between a turbocharger and an engine block for providing a fluid communication conduit includes a hollow tubular member having a first insertion end which is receivable within an engine block bore, and a second opposite mounting end having a flange for attaching the oil drain tube to the turbocharger. The insertion end of the oil drain tube having a sealing portion which includes two annular grooves with O-rings circumferentially mounted therein, and a stop portion defined by an annular protuberance formed adjacent to the annular grooves of the tubular member. A leak proof connection is provided at the engine block. The protuberance formed on the drain tube abuts the engine block when the drain tube is connected thereto and limits the axial insertion of the drain tube into the bore.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: April 4, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Jerry C. Buchanan, Donna M. Virnig
  • Patent number: 5402313
    Abstract: A thermal attachment assembly for heat generating electronic devices which uses a canted coil spring to apply pressure directly against electronic components. The attachment assembly includes a heat sink housing in which the electronic components are pressed against an electrically insulating, thermally conductive film positioned against a surface of a shoulder or side wall of the heat sink housing. The force of the canted coil spring can be counterbalanced by a cover for the housing, or by an abutment that is either fixed in the housing or floats between attachment and an assembly at each of opposite sides of the housing.
    Type: Grant
    Filed: May 21, 1993
    Date of Patent: March 28, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Paul G. Casperson, Michael Durbin
  • Patent number: 5396926
    Abstract: A pressure balanced three-way solenoid valve including a valve housing having a valve chamber and a high pressure fluid supply passage, high pressure fluid outlet passage and drain passage communicating with the valve chamber is disclosed. A movable valve member is reciprocally received in the valve chamber so as to be reciprocated between first and second positions for selectively fluidically communicating the outlet passage with either the supply passage or drain passage. A first valve seat is formed in the valve housing and concentrically disposed in the valve chamber for fluidic communication between the outlet passage and drain passage and a second valve seat is concentrically disposed in a cavity formed in the movable valve member for sealing communication between the supply passage and outlet passages.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: March 14, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Arpad M. Pataki, Bela Doszpoly, Bryan W. Swank, Mark S. Cavanagh, John D. Lane, Kent V. Shields
  • Patent number: 5392642
    Abstract: Vibration sensors are used to monitor the resonant frequency of each cylinder of a multi-cylinder engine and the detection of an abnormal resonant frequency, i.e., one outside of an established range, is used as an indication that one or more specific cylinders is operating at an improper power level. Vibration signals associated with combustion in each cylinder can be used to perform FFT (Fast Fourier Transformation) with the combustion resonant frequencies for all engine cycles being determined and an averaged resonant frequency for each cylinder obtained. Shifts in the averaged resonant frequency or the detection of a zero resonant frequency for only one of the cylinders can be used as an indication that the cylinder with the shifted or zero resonant frequency is experiencing a low power condition, including misfiring.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: February 28, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventor: Xuefeng T. Tao
  • Patent number: 5390851
    Abstract: In accordance with a preferred embodiment of the invention, a solenoid operated unit fuel injector, for internal combustion engines of the type which are capable of having distinct timing, metering and injection periods, and in which the same supply line serves for the delivery of fuel to both a timing chamber and a metering chamber, is improved by providing a drilling in the injector barrel which leads directly from the timing fluid flow portion of the fuel supply circuit to an injector fuel drain path, and mounting a C-shaped spring valve on the injector body for controlling dumping of fuel through the drilling at a location above that of the timing and metering spill ports.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: February 21, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Martin W. Long, George L. Muntean, Paul D. Free
  • Patent number: 5386698
    Abstract: A control system and method for governing turbocharged internal combustion engines is disclosed including an electronic control unit, a fuel flow control valve, an engine speed sensor, and a bypass valve to control exhaust gas flow through an exhaust bypass conduit. When engine speed is above a first predetermined engine speed, the electronic control unit controls the bypass valve to regulate exhaust gas flow through the bypass conduit, thereby limiting exhaust gas flow through the turbocharger. When the engine speed reaches a second, predetermined engine speed value that is higher than the first predetermined engine speed value, the electronic control unit completely opens the bypass valve allowing virtually total bypass of the turbocharger, and limits fuel flow to the engine by controlling the fuel flow control valve.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: February 7, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventor: Mostafa M. Kamel
  • Patent number: 5386809
    Abstract: A compression braking system for an internal combustion engine having at least one working piston including a master piston operated by an engine component such as a fuel injector actuating mechanism and a slave piston fluidically connected with the master piston to open an engine exhaust valve wherein a pressure relief valve is provided to prevent excessively high pressure supply fluid from a low pressure supply circuit from reaching the high pressure circuit connecting the master and slave pistons thereby preventing inadvertent and excessive movement of the slave piston and possible damage to the engine. The pressure relief valve is fluidically connected to the low pressure supply circuit upstream of a control valve which separates the low and high fluid circuits and opens to vent fluid from the low pressure circuit while allowing continuous, uninterrupted operation of the engine in the braking mode.
    Type: Grant
    Filed: October 26, 1993
    Date of Patent: February 7, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Steven W. Reedy, David A. Vittorio
  • Patent number: 5385373
    Abstract: A tamper-evident, self-locking cover for mechanical and electrical connections includes a unitary, molded plastic member including two generally semi-cylindrical pockets connected by a first living hinge and including snap-fit, self-locking, tamper-evident means of connection. Integrally therewith and extending from one pocket half are a pair of generally cylindrical receptacles arranged so as to provide three gripping fingers. Integrally therewith and extending from the other enclosing portion are a pair of stem members which are initially oriented in a non-engaging orientation and which are connected by means of a second living hinge. As the enclosing portions are flexed and closed around the object to be encased and protected, the stem members are flexed into a controlled engaging orientation so as to be brought into alignment with the female receptacles.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: January 31, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventor: Vaughn R. Love
  • Patent number: 5381770
    Abstract: A compact, short stroke breakover throttle lever assembly which prevents damage to high pressure internal combustion engine fuel pumps is provided. The compact, short stroke breakover throttle lever of the present invention includes a throttle lever element and a throttle control link element which are coaxial and move synchronously with a fuel pump throttle shaft that are pivotally connected at an end of the throttle lever element a maximum distance from the fuel pump throttle shaft. A central throttle control link connection and return spring connection are provided on the throttle control link element. The pivotal movement of the throttle control link element relative to the throttle lever element is limited by the travel limits of a spring engaging element which cooperates with a spring to hold the throttle lever element and throttle control link element in alignment.
    Type: Grant
    Filed: September 22, 1993
    Date of Patent: January 17, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventor: Michael J. Marthaler
  • Patent number: 5377636
    Abstract: A pump-line-nozzle fuel injection system in which a supply pump is coupled to a high pressure pump having a plurality of pumping cylinders, each of which has a cam-driven timing plunger and a floating metering plunger. During the retraction stroke, flow to a timing chamber formed between the pistons is blocked by a solenoid valve while the fuel passes into a metering chamber, at the discharge side of the pump, which is closed relative to the high pressure delivery line by a delivery valve. Once the proper quantity of fuel has been metered, the solenoid valve opens allowing fuel to flow into the metering chamber, balancing the pressure on opposite sides of the metering piston, so as to prevent the metering plunger from retracting further as the timing plunger continues to retract. During the compression stroke, at the appropriate time for commencement of injection, the solenoid valve recloses creating a hydraulic link between the metering and timing plungers, so that the fuel is pressurized.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: January 3, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: David M. Rix, Harry L. Wilson, Rodney C. Wilson, George L. Muntean
  • Patent number: 5372114
    Abstract: A hydraulic tappet for use in the fuel injector drive trains of compression ignition or diesel internal combustion engines are provided which optimize injector timing for improved fuel economy. One embodiment of the hydraulic tappet of the present invention includes a dampened pressure regulating feature which determines blow down pressure. A second embodiment of the hydraulic tappet of the present invention includes a dampening load cell feature which allows the blow down pressure of the load cell to be increased and injection timing to be optimally advanced.
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: December 13, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Gary L. Gant, P. Douglas Free, James R. Katzenmeyer, Donald E. Duckworth, George L. Muntean
  • Patent number: 5353766
    Abstract: A fuel distributor is provided which is capable of distributing fuel through plural fuel injection lines to the corresponding cylinders of a multicylinder internal combustion engine and which includes a distributor housing including a supply inlet passage, a plurality of fuel injection outlet passages and a plurality of distributor valves for providing sequential periodic fluidic communication between the supply inlet passage and the outlet passages. Each distributor valve, which may be cam-actuated or solenoid-actuated, is adapted to be placed in an open position to define a fuel injection period during which high pressure fuel may flow through the distributor valve to the respective engine cylinder and a closed position blocking fuel flow through the respective fuel injection outlet passage.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: October 11, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Bai M. Yen, Julius P. Perr
  • Patent number: 5347966
    Abstract: An air intake heating system and method for use in a diesel engine having a battery and alternator is provided for minimizing white smoke emissions without excessively depleting the engine battery at low engine speeds wherein the battery and not the alternator is the principal contributor of power to the air intake heater.
    Type: Grant
    Filed: June 25, 1993
    Date of Patent: September 20, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Jeff A. Mahon, Ross C. Berryhill
  • Patent number: 5343780
    Abstract: A variable power drivetrain engine control system for a heavy duty vehicle such as a tractor/trailer combination or truck is disclosed. The engine control system provides higher output capability for the engine of the vehicle in accordance with certain detected conditions. If the vehicle speed falls a predetermined DELTA miles/hour below a LEARNED SPEED of the vehicle, the engine is enabled to operate at a higher power output capability until the vehicle resumes the LEARNED SPEED. Further, high output capability is enabled when the vehicle deceleration is in excess of a predetermined deceleration rate. Again, the high output capability is disabled once the vehicle retains the LEARNED SPEED velocity. The quantity DELTA can be variable with respect to actual vehicle speed to provide more responsive operation of the variable power drivetrain system thereby providing improved responsiveness to road conditions in accordance with relative vehicle speed.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: September 6, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: John R. McDaniel, Paul R. Rabe, John H. Stang, Peter J. Griffen, Mark W. Stasell, Edward E. Londt, Barrie L. Wilson
  • Patent number: 5335852
    Abstract: A unit fuel injector adapted for periodic injection of fuel into a combustion chamber of an engine at variable times from cycle to cycle under the control of the engine lubrication fluid is provided, comprising an injector body containing an injector cavity and a discharge orifice communicating with one end of the injector cavity to discharge fuel into the combustion chamber, a lubrication fluid timing circuit and a fuel metering circuit separate from the lubrication fluid timing circuit. A lubrication fluid link positioned in the lubrication fluid timing circuit within the injector cavity has a variable effective length which is varied by the operation of a control valve positioned within the lubrication timing circuit to vary the timing of injection. The control valve is operated to control the flow of lubrication fluid in the lubrication fluid timing circuit to control both the timing of injection and the metering of fuel on a cycle by cycle basis.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: August 9, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: George L. Muntean, Harry L. Wilson, Gary L. Gant