Patents by Inventor Lester L. Peters

Lester L. Peters 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).

  • 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: 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: 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: 5098260
    Abstract: An electro-hydraulic position-servo device to quickly and accurately position a stop element is provided for use with a positive displacement fuel injection system, wherein a shuttle is used to positively displace pre-metered slugs of fuel to unit injectors. The stop device is operatively associated with a control shaft having at least one helical surface thereon; the stop element and control shaft slidably located within a housing. The housing permits communication between at least one pressurized fluid source and a drain line by way of a chamber within which the control shaft is located. Thus, by simply rotating the control shaft from rotational drive means, the control shaft will assume an axial position determined by the orientation of the helical surface with respect to the supply and drain lines. The device is adjustable by rotation of the shaft to a new position with the re-orientation of the helical surface.
    Type: Grant
    Filed: April 23, 1990
    Date of Patent: March 24, 1992
    Assignee: Cummins-Engine Company, Inc.
    Inventors: Edward D. Smith, Lester L. Peters
  • Patent number: 5094397
    Abstract: A unit fuel injector assembly (88) periodically injects fuel of a variable quantity on a cycle to cycle basis as a function of the pressure of fuel supplied to the injector from a source of fuel and at a variable time during each cycle as a function of the pressure of the timing fluid supplied to the injector from a source of timing fluid. A reciprocating plunger assembly (146) is received within the injector body (106) and includes an upper plunger section (148), a lower plunger section (150) and an intermediate plunger section (152) in order to define a variable volume timing chamber (138), a variable volume injection chamber (162) and a variable volume compensation chamber (176).
    Type: Grant
    Filed: February 11, 1991
    Date of Patent: March 10, 1992
    Assignee: Cummins Engine Company, Inc
    Inventors: Lester L. Peters, Julius P. Perr
  • Patent number: 5042445
    Abstract: An electronically controlled fuel supply system is provided for employing a plurality of fuel injectors which maximize SAC pressures under both low speed and high speed operating conditions and are capable of sustaining SAC pressures in excess of 30,000 psi. The fuel supply system of the present invention includes a gear pump which supplies pressure-modulated fuel to a fueling channel and to a timing channel and from there to a plurality of injectors. Fuel pressure regulator means and timing fluid pressure regulator means are provided in the fueling and timing channel, respectively. An electronic control unit receives information relating to engine operating conditions from a plurality of sensors and actuates the fuel pressure regulator means and the timing fluid pressure regulator means to adjust the pressure as required for the specific engine operating conditions.
    Type: Grant
    Filed: August 24, 1990
    Date of Patent: August 27, 1991
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Julius P. Perr, Edward D. Smith
  • Patent number: 5037031
    Abstract: The present invention is directed to open nozzle type unit fuel injectors, and more specifically to an improved lower plunger and cup design of an open nozzle unit injector to minimize trapped volume and reduce unburned hydrocarbons in vehicle emissions. The lower plunger includes at least a major and a minor diameter sections with the minor diameter section extending within a bore of said cup at least partially between the fully advanced and retracted positions of the plunger. Moreover, the labyrinth flow area between the cup bore and the minor diameter section of the plunger is designed to reduce the trapped volume of fuel that results in the advanced plunger position while reducing sensitivity to fuel metering in the retracted plunger position. In one embodiment, the cup bore and minor diameter section are stepped. In another, both the bore and the minor diameter section are tapered. In yet another embodiment, only the cup bore is modified.
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: August 6, 1991
    Assignee: Cummins Engine Company, Inc.
    Inventors: Jeffery L. Campbell, Lester L. Peters, Gary L. Gant, Leslie A. Roettgen, David P. Genter, Kevin R. Wadell
  • Patent number: 4986472
    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 during downward portions of the reciprocating motion. A timing spring is wound around the upper portion of the lower plunger to bias the lower plunger upwardly. A timing chamber formed between the upper and intermediate plungers receives timing fluid to create a hydraulic link between the plungers. Timing fluid exits the timing chamber through a central passage, which may have a reduced area regulating orifice, formed through the intermediate plunger, which is ordinarily closed by a valve mechanism. The valve mechanism is acted upon in part by the timing spring. To improve the pressure regulation using a higher spring load and to accommodate a larger area drainage passage, a valve spring biases closed the passage.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: January 22, 1991
    Assignee: Cummins Engine Company, Inc.
    Inventors: Timothy A. Warlick, Jeffrey L. Campbell, Lester L. Peters, Michael E. Lucas, Julius P. Perr, Kuang-Wen T. Wan
  • Patent number: 4971016
    Abstract: An electronically controlled fuel supply system is provided for employing a plurality of fuel injectors which maximize SAC pressures under both low speed and high speed operating conditions and are capable of sustaining SAC pressures in excess of 30,000 psi. The fuel supply system of the present invention includes a gear pump which supplies pressure-modulated fuel to a fueling channel and to a timing channel and from there to a plurality of injectors. Fuel pressure regulator means and timing fluid pressure regulator means are provided in the fueling and timing channel, respectively. An electronic control unit receives information relating to engine operating conditions from a plurality of sensors and actuates the fuel pressure regulator means and the timing fluid pressure regulator means to adjust the pressure as required for the specific engine operating conditions.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: November 20, 1990
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Julius P. Perr, Edward D. Smith
  • Patent number: 4909219
    Abstract: A hydromechanical fuel pump system of supplying timing fluid and fuel to high pressure fuel injectors utilizing a hydromechanical fuel control circuit to control the flow of fuel that is withdrawn from a fuel reservoir by a pump and delivered to the fuel injectors which includes a speed signal generator that produces a fuel pressure in a speed signal branch line of the fuel control circuit that is a function of engine rpm, and a torque shaping module that is provided in a fuel delivery branch of the fuel control circuit.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: March 20, 1990
    Assignee: Cummins Engine Company, Inc.
    Inventors: Julius P. Perr, Lester L. Peters, Edward D. Smith
  • Patent number: 4621605
    Abstract: A positive displacement fuel injection system for use with a combustion engine including a fuel pump (10,10') which forms and delivers pre-metered slugs of fuel and timing fluid to unit injectors (300,300') associated with the engine combustion chambers. The pre-metered slug of timing fluid has a prescribed volume and sets the timing advance for the unit injector. The fuel pump can vary the size of the pre-metered slugs of fuel and timing fluid on a cycle-by-cycle basis.
    Type: Grant
    Filed: December 30, 1983
    Date of Patent: November 11, 1986
    Assignee: Cummins Engine Company, Inc.
    Inventors: Alfred W. Carey, Jr., Lester L. Peters
  • Patent number: 4463901
    Abstract: A unit fuel injector assembly (2, 88) is disclosed for periodically injecting fuel of a variable quantity on a cycle to cycle basis as a function of the pressure of fuel supplied to the injector from a source of fuel (48) and at a variable time during each cycle as a function of the pressure of a timing fluid supplied to the injector from a source of timing fluid (54). A reciprocating plunger assembly (24,146) is received within the injector body (10, 106) and includes an upper plunger section (26, 148), a lower plunger section (28,150) and an intermediate plunger section (30,152) in order to define a variable volume timing chamber (32,138), a variable volume injection chamber (34,162) and a variable volume compensation chamber (36,176).
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: August 7, 1984
    Assignee: Cummins Engine Company, Inc.
    Inventors: Julius P. Perr, Lester L. Peters
  • Patent number: 4441654
    Abstract: A unit injector assembly (2, 40) of the cam actuated, open nozzle type is disclosed in which an extremely compact injector body is actuated by a cam lobe (42) having a stepped profile for causing fuel to be metered into an injection chamber (52) of the injector (2) without blow back of gas into the supply passage (66) feeding fuel to the injector. The invention is characterized by an injector body (4) having a minimum number of internal flow passages (66, 72) designed to reduce the complexity and cost of manufacture of the injector and having an exterior shape designed to form a fuel supply flow path (22) and an isolated fuel drain flow path (24) between the exterior surface of the injector body (4) and the interior surface of the recess (6) in which the injector (2) is designed to be received.
    Type: Grant
    Filed: December 31, 1981
    Date of Patent: April 10, 1984
    Assignee: Cummins Engine Company, Inc.
    Inventor: Lester L. Peters
  • Patent number: 4410138
    Abstract: A unit injector (200, 300, 400, 500, 600) of the cam actuated, open nozzle type is disclosed including an extremely compact injector body (202, 302, 402, 502) having a minimum number of internal flow passages and a two piece injector plunger (222, 308, 310, 412, 506, 510, 606, 612) arranged to provide pressure/time metering (all embodiments), scavenging fuel flow (all embodiments), hydraulic timing (all embodiments), fuel cut off (embodiments of FIGS. 1, 3 and 4), wear compensation in advance timing mode (all embodiments) and sharp cut off of fuel injection without high "crush" loads and wear compensation in retard and advance modes (embodiment of FIG. 3).
    Type: Grant
    Filed: December 31, 1981
    Date of Patent: October 18, 1983
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Timothy A. Warlick
  • Patent number: 4294109
    Abstract: This disclosure relates to apparatus for testing a hydraulic assembly. The assembly includes a member having an orifice formed through a wall thereof and a valve member spring urged toward one side of the wall so as to close the orifice. The apparatus includes an enclosure for the assembly and hydraulic pressure means for applying hydraulic pressure to the opposite side of the wall around the orifice. The pressure applying means includes means for gradually changing the hydraulic pressure and indicating the pressure at which the valve member moves to open the orifice. The apparatus further includes means for supporting the assembly on a link so as to simulate actual operating conditions.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: October 13, 1981
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, John W. Black