Patents Assigned to Cummins Engine
  • Patent number: 5336047
    Abstract: A self-sealing water pump seal for a water pump having a rotating shaft that rotates with respect to a fixed housing comprises a conventional primary face seal and a barrier situated between the primary seal and the weep hole in the fixed housing of the water pump. The barrier causes solids dissolved in and/or carried by the vehicle coolant that escape past the primary seal to be deposited in the conduit leading to the weep hole such that a portion of the conduit becomes clogged over time with the solids thereby creating a secondary seal to the primary face seal.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: August 9, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventor: J. Steven Kolhouse
  • Patent number: 5333786
    Abstract: A fuel injector for an internal combustion engine includes a main body including a timing bore, a timing plunger disposed in the timing bore, an electronically-operated solenoid valve assembled to the main body, a nozzle having a needle bore and an injection needle disposed in the needle bore which needle is operable under certain conditions to lift so as to initiate fuel injection. Disposed between the main body and the nozzle member is a one-piece adapter which is designed to include an axially-extending metering bore and a needle spring cavity. A metering plunger is disposed within the metering bore and a biasing spring is disposed within the needle spring cavity. At the base of the needle spring cavity is a button which serves as a direct abutment interface between the top of the needle and the bottom of tile biasing spring.
    Type: Grant
    Filed: June 3, 1993
    Date of Patent: August 2, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Gary L. Gant, George L. Muntean, Jeffrey C. Osborn
  • Patent number: 5329908
    Abstract: In accordance with preferred embodiments, a fuel injector has a gas accumulator of a volume that is at least ten times the maximum amount of fuel which would have to be injectable thereby, and a solenoid operated poppet valve with an end face that opens into the combustion cylinder and is shaped to deflect a portion of the fuel injected into direct contact with the ignition plug. In a first embodiment, using a variable fuel supply, an electronic control unit (ECU) controls the injection timing to inject the compressed gas into the cylinders as each's piston nears its top dead center (TDC) position to obtain diesel engine-like efficiencies (.eta.=45%) so long as the compressed gas supply pressure is sufficiently high (at least approximately 2,000 psi), and when the compressed gas supply pressure becomes too low for high efficiency operation (i.e.
    Type: Grant
    Filed: June 8, 1993
    Date of Patent: July 19, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Yul J. Tarr, Julius P. Perr
  • Patent number: 5326034
    Abstract: A compact closed nozzle assembly for a fuel injector is provided which reduces the total length of the injector, minimizes the trapped volume of fuel and, thus, the response time of the injector and eliminates a high pressure joint in the injector body. The compact closed nozzle assembly of the injector includes a nozzle valve element positioned in an injector cavity adjacent injector orifices and operable to be placed in an open position in which fuel may flow a fuel transfer circuit through the injector orifices into the combustion chamber, and a closed position in which fuel flow through the injector orifice is blocked. A nozzle spring, which is shorter and larger in diameter than conventional nozzle springs, biases the nozzle valve element into the closed position.
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: July 5, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventor: Lester L. Peters
  • Patent number: 5323964
    Abstract: A fuel injector includes an injector housing having a plunger assembly disposed within a central axial bore and including a lower plunger, an intermediate plunger, and an upper plunger. The lower plunger reciprocates within the central bore to meter a variable quantity of fuel and to inject this fuel during downward portions of the reciprocating motion. A timing chamber formed between the upper and intermediate plungers receives an amount of timing fluid to create a variable length hydraulic link between the plungers. The fluid is drained from the chamber through a drain passage at the end of the injection cycle. The timing chamber has associated with it a mechanism for changing the effective flow function of the drain passage, at a point in the cycle following fuel injection, to maintain a large downward pressure on the lower plunger to hold the lower plunger down and thus prevent additional, undesired fuel flow into the combustion chamber.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: June 28, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Bela Doszpoly, Laszlo Tikk, Yul Tarr, Leonard Hummel
  • Patent number: 5320909
    Abstract: A thermal barrier coating for metal articles subjected to rapid thermal cycling includes a metallic bond coat deposited on the metal article, at least one MCrAlY/ceramic layer deposited on the bond coat, and a ceramic top layer deposited on the MCrAlY/ceramic layer. The M in the MCrAlY material is Fe, Ni, Co, or a mixture of Ni and Co. The ceramic in the MCrAlY/ceramic layer is mullite or Al.sub.2 O.sub.3. The ceramic top layer includes a ceramic with a coefficient of thermal expansion less than about 5.4.times.10.sup.-6 .degree.C.sup.-1 and a thermal conductivity between about 1 J sec.sup.-1 m.sup.-1 .degree.C.sup.-1 and about 1.7 J sec.sup.-1 m.sup.-1 .degree.C.sup.-1.
    Type: Grant
    Filed: July 13, 1993
    Date of Patent: June 14, 1994
    Assignees: United Technologies Corporation, Cummins Engine Co.
    Inventors: Alan J. Scharman, Thomas M. Yonushonis
  • Patent number: 5321582
    Abstract: A thermal attachment assembly for heat generating electronic devices which includes a multi-element spring having low force, high deflection, spring fingers, and which is adjustable and attached by screws to a cover to apply pressure directly against electronic components arranged generally perpendicular to at least one edge of a printed wired board (PWB). The attachment assembly includes a heat sink housing in which the electronic components are pressed against an electrically insulating, thermally conductive film positioned against one wall of the heat sink housing. The PWB is snapped to a carrier and both are placed into the housing so that the electronic devices are positioned within spaces of the carrier. The carrier includes sloping surfaces, so that the spring fingers are deflected downward when the cover is attached to the housing, thereby insuring that the spring fingers are properly positioned onto the electronic devices, between the spaces of the carrier.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: June 14, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventor: Paul G. Casperson
  • Patent number: 5320278
    Abstract: An improved high pressure fuel injector for internal combustion engines in which problems of hysteresis delays and fuel leakage at the commencement of the metering process can be avoided without affecting the ability to precisely control the fuel supply pressure by the provision of a way for the metering and injection plunger to be acted upon only by the pressure of the incoming fuel supply. An improved metering and injection plunger spring arrangement provides a valving of the drain path that prevents leakage through drain passages and/or about the metering and injection plunger during the fuel metering and injection phases. Also, a double check valve arrangement is incorporated into the plunger seat disc to minimize the possibility of back-flow leakage of fuel during injection of the fuel from the metering and injection chamber.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: June 14, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Oldrich S. Kolarik, Tibor J. Villanyi
  • Patent number: 5308169
    Abstract: A thrust bearing for a turbocharger includes a main body portion which defines a central bore for receipt of a thrust collar, an oil reservoir in the shape of a blind, oblong slot disposed in the main body portion and an oil passageway connecting the oil reservoir with the central bore. As oil is drained from the turbocharger by a siphoning action as the engine oil level drops, oil which is stored in the oil reservoir will remain and after the engine has completely stopped this stored oil is available to drain into the interface between the thrust collar and central bore of the thrust bearing in order to provide lubricating oil to this interface upon restart of the engine. Oil is also provided by the reservoir to the turbine and compressor journal bearings where it is held in small clearances on the inner and outer surfaces of the journal bearings.
    Type: Grant
    Filed: November 20, 1992
    Date of Patent: May 3, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Glenn L. Baker, David R. Engle, Roger Williams
  • Patent number: 5303681
    Abstract: An improved coupling assembly is provided for transmitting rotary power from the working end of an internal combustion engine to a driven shaft. The crankshaft also has a free end connected to an accessory drive train. The coupling assembly comprises a low inertia flywheel having a mass so selected as to cause the node of the first crankshaft mode of torsional vibration to be located in the vicinity of the middle of the crankshaft, and a flexible coupling which interconnects the working end of the crankshaft with the driven shaft.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: April 19, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventor: John G. Crofts
  • Patent number: 5301876
    Abstract: A fuel injector which uses interchangeable subassemblies to allow the fuel injector to be converted from open to closed nozzle options without affecting engine installation, and without altering the timing or metering principles. In accordance with a preferred embodiment of the invention, the fuel injector is comprised of two subassemblies, a first subassembly of which is a timing or control subassembly that is used in both the closed and open nozzle options, and which forms the top portion of the fuel injector. The second subassembly is a nozzle assembly and is form in two versions, an open nozzle version and a closed nozzle version, either of which can be used with the timing assembly. In a preferred form of the timing subassembly, a pressure-responsive valve for opening a timing chamber draining passage is provided within the upper plunger.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: April 12, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Bryan W. Swank, Laszlo Tikk, Yul J. Tarr
  • Patent number: 5301875
    Abstract: A unit fuel injector is provided comprising an injector body containing a pumping chamber and a valve element provided for movement between (i) an advanced position wherein a supply passage communicates with the pumping chamber through a transfer passage and (ii) a retracted position wherein communication between the supply passage and the pumping chamber is blocked to allow fuel to flow from the pumping chamber through the transfer passage and out the discharge orifice. In one embodiment the valve element includes a control valve integrally formed with a tip valve, and a force balancing element for tending to balance the forces acting on the valve element by reducing the effective cross-sectional area upon which fluid pressure operates. The control valve, whether formed integral with or separate from the tip valve, extends through the solenoid to engage a valve seat formed adjacent the pumping chamber.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: April 12, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Cary L. Gant, George L. Muntean, Julius P. Perr, O. Eddie Sturman, Dennis A. Wilber, Charles R. Kelso
  • Patent number: 5299738
    Abstract: An improved high pressure fuel injector for internal combustion engines of the type having a plunger assembly, with a plurality of plungers, that is mounted within a central bore within the body of the fuel injector for reciprocal movement, the plunger assembly having an upper plunger and a lower plunger mounted for reciprocal motion within the central bore and a variable volume injection chamber in said lower end of the central bore between the injection orifice and a bottom end of the lower plunger. In accordance with a preferred embodiment, the problem of large quantities of air being drawn into the injector from the combustion chamber during the retraction stroke injection stroke is avoided by limiting the return stroke of the lower plunger to a distance that is significantly less than that of the stroke of the upper plunger of the plunger assembly.
    Type: Grant
    Filed: September 16, 1992
    Date of Patent: April 5, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: David P. Genter, Lester L. Peters
  • Patent number: 5295462
    Abstract: An internal combustion engine cylinder assembly includes a coin insert disposed at the top end of the cylinder acting as a firing deck. The coin insert is formed of a super alloy material and is situated within a recess defined in the cylinder head. A radial clearance is provided between the cylinder head and the coin insert to allow for thermal expansion during engine combustion. In one embodiment, the coin insert is welded to the cylinder head at a location immediately adjacent the fuel injector to directly transfer injector and combustion loads through the insert into the cylinder head. In a second embodiment, a coin insert is welded to an injector sleeve which is disposed within the injector bore of the cylinder head between the cylinder head and the fuel injector. The injector sleeve includes an upper ledge disposed from the injector opening through which loads are transmitted from the coin insert into the upper part of the cylinder head.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: March 22, 1994
    Assignee: Cummins Engine Co., Inc.
    Inventors: Steve G. Barnes, Kurt W. Schoenegge
  • Patent number: 5295300
    Abstract: A salvage method for a turbocharger bearing housing includes the steps of removing the bearing housing from the turbocharger, setting up the bearing housing on a lathe and machining the worn or damaged surfaces at one end of the bearing housing where such damage has been caused by the turbocharger heat shield. Once the metal is removed from the worn or damaged portions of the bearing housing a salvage sleeve having a hollow, generally cylindrical shape is pressed down onto the prepared surfaces of the housing. Since the assembly of the salvage sleeve to the machine bearing housing will be an interference fit, the salvage sleeve is heated so that it can slide freely onto the machined outside diameter of the bearing housing. Once the sleeve cools and the interference fit is established, the salvage sleeve is machined so as to reestablish the original dimensions of the turbocharger bearing housing prior to becoming worn or damaged.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: March 22, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventor: James J. Garrick, Jr.
  • Patent number: 5292072
    Abstract: Fuel injector for an internal combustion engine which has a timing chamber bore in its body intersecting at an acute angle with an auxiliary bore. These bores are fuel-receiving passages exposed to the pressure of injection. A radiused intersection between the walls of the respective bores reduces the concentration of stress within the fuel injector, allowing the injector to withstand the high injection pressures of mechanical pressurization. An electrochemical machining method and fixture for machining the intersection between the bores of a fuel injector body or other workpiece is also disclosed.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: March 8, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: David M. Rix, Christine M. Yingling
  • Patent number: 5279211
    Abstract: A ceramic-metal composite structure which minimizes tensile ceramic loads and accommodates differences in thermal expansion characteristics between a metal member and a ceramic member without reliance on precise feature control for either member. The composite includes a mechanical retainer which allows a loose fitting relationship between the metal and ceramic members. The ceramic member is secured within a receiving bore in the metal member by the retainer in a manner which eliminates the need for precise machining of the ceramic and metal members. The metal member may be configured to accept either an internal or an external mechanical retainer element. The composite ceramic-metal structure of the present invention finds particular utility in forming a durable wear-resistant interface in internal combustion engine actuator or actuating components, such as compression brake master pistons.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: January 18, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Joseph C. Bentz, John T. Carroll, III, Katsuhiro Shinosawa, David P. Genter
  • Patent number: 5277162
    Abstract: A fuel system for fuel injectors of an internal combustion engine is provided with a hydromechanical timing valve having a valve body assembly with a barrel and plunger arrangement. The plunger is displaceable within the barrel under the counterbalancing forces of rail fuel pressure (load) and one or more timing valve springs. The relative position of the barrel and plunger determines the effective size of the port through which timing fluid can flow. In accordance a first embodiment, the plunger has a tapered head which covers and uncovers ports in the barrel to a greater or lesser extent, thereby creating a variable flow-through cross section. Alternatively, in accordance with other embodiments, the barrel has ports with slot-like orifices of progressively changing widths which coact with a metering groove on the spool to define a variable flow cross section through which the timing fluid must pass.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: January 11, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Edward D. Smith, David L. Buchanan, Lester L. Peters
  • Patent number: 5275337
    Abstract: A pressure responsive spring valve which is able to function at high pressures and temperatures, and can attain a high degree of precision control in a minimum of space, as well as an improved high pressure fuel injector for internal combustion engines which uses such a spring valve to achieve the demanding performance characteristics of the more complex new injector designs within limited space requirements. In all cases, a band-like spring valve member is used to reduce the number of parts and the space requirements therefor relative to that required for a coil spring type pressure control valve.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: January 4, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Oldrich S. Kolarik, Jeffery L. Campbell
  • Patent number: 5268842
    Abstract: A control system for controlling fueling and/or timing of a fuel injector in an internal combustion engine. Fuel injection is controlled based upon the recent operating history of the engine. In particular, the difference between the instantaneous speed and the average speed over a previous predetermined period are compared and the difference is utilized in determining a control variable which in turn can be used for selecting fueling and/or timing values. The difference between the instantaneous fueling and the average fueling over a predetermined period can also be used in selecting the control variable. The fuel injector fueling and/or timing is determined utilizing fueling and/or timing values from at least two maps, with the control variable determining the proportions of the timing/fueling valves to be utilized in determining commanded timing/fueling.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: December 7, 1993
    Assignee: Cummins Engine Company, Inc.
    Inventors: Cary J. Marston, Jeffrey P. Seger, Andrew C. Rosselli, Leslie A. Roettgen