Patents Assigned to Societe d'Etudes de Machines Thermiques S.E.M.T.
  • Patent number: 4591321
    Abstract: A method of damping hydraulic pressure waves and of removing peaks from pressure variations in the feed ducts of a hydraulic pump resulting from excess fluid returned with high kinetic energy to a feed chamber uses this kinetic energy directly to increase temporarily the volume of the feed chamber by a value lying in the range 10% to 30% of the maximum cylinder capacity of the hydraulic pump. The pump has a resiliently movable wall disposed in a feed chamber perpendicularly to the direction of a high kinetic energy jet of fluid from a passageway opening into the chamber. The wall is located on the axis of the passageway at a distance from the opening that is not more than 1.5 times the smallest diameter of the passageway. The invention also relates to a hydraulic pump for implementing the method. Applicable to fuel injection pumps in Diesel engines.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: May 27, 1986
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T., S.A.
    Inventor: Alain Devaux
  • Patent number: 4583498
    Abstract: A method of changing the direction of rotation of an internal combustion engine, and in particular of a marine engine, in which the camshafts (15) include two cams (16, 17) for each tappet (20) of a controlled member, each of said cams being suitable for use in one direction of rotation, the direction of rotation of the engine being changed by shifting said camshafts in translation, wherein, prior to shifting said camshafts, the tappets are rotated through one-fourth of a turn so as to put the axis of rotation of each tappet cam-follower wheel (10) orthogonal to the direction of camshaft translation. The invention also applies to an engine employing the method.
    Type: Grant
    Filed: April 17, 1985
    Date of Patent: April 22, 1986
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T., S.A.
    Inventor: Jean-Louis Magnet
  • Patent number: 4513572
    Abstract: A turbocharged internal combustion engine includes a supercharging air compressor that delivers compressed air to the engine via a compressed air delivery conduit, the compressor being coupled to an exhaust gas turbine having an inlet connected to the exhaust manifold of the engine via an exhaust gas conduit and an outlet, a bypass conduit connecting the compressed air delivery conduit to the exhaust gas conduit, and is characterized by an energy recovery device comprising an auxiliary vapor generator having a heating fluid side with an inlet connected to the outlet of the exhaust gas turbine and having a heated fluid side with an outlet connected to an inlet of an auxiliary vapor turbine via an auxiliary vapor conduit, and a heat exchanger traversed by the bypass conduit and inserted in the auxiliary vapor conduit for preheating the bypassed compressed air by excess heat of the auxiliary vapor prior to delivering the auxiliary vapor to the auxiliary vapor turbine.
    Type: Grant
    Filed: March 29, 1983
    Date of Patent: April 30, 1985
    Assignee: Societe d'Etudes de Machines Thermiques, S.E.M.T.
    Inventor: Pierre L. Bonnaud
  • Patent number: 4480792
    Abstract: A fuel injector for an internal combustion engine comprising a body traversed by an injection conduit and provided with a lateral fuel inlet located in the lower half of the body, the body containing an injector needle continued by a push-member provided with a head upon which bears a return spring urging the injection needle to the closed position and prestressed by means of an adjusting screw, the push-member being sufficiently short to allow the lateral fuel intake to be located above the upper end of the assembly constituted by the adjusting screw, the spring, the push-member and the needle.
    Type: Grant
    Filed: June 22, 1982
    Date of Patent: November 6, 1984
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventors: Patrick Renaud, Jean-Paul Bourget
  • Patent number: 4424790
    Abstract: The invention relates to a method and a device for improving the efficiency of a four-stroke-cycle internal combustion engine. The main purpose of the invention is to obtain an effective compression ratio that is capable of automatic variation without introducing additional elements whatever the load, but only by adapting the engine cycle timing diagram. Said timing diagram includes an overlap stage between the lifts of at least one exhaust valve and at least one intake valve, said intake valve being closed near or before the bottom dead center of the piston, and said exhaust valve being closed beyond the instant of fixed closing of the intake valve.
    Type: Grant
    Filed: May 11, 1982
    Date of Patent: January 10, 1984
    Assignee: Societe d'Etudes de Machines Thermiques, S.E.M.T.
    Inventor: Remi Curtil
  • Patent number: 4404805
    Abstract: An internal combustion engine supercharged with air by an exhaust gas-driven turbo-compressor discharging through a by-pass duct a tapped flow rate of compressed air into the exhaust gas pipe-line feeding the turbine, said tapped flow rate of compressed air being heated by means of a heat exchanger inserted into the by-pass duct and through which are flowing the exhaust gases from the turbine, said tapped flow rate of heated compressed air being injected into the upstream end of the exhaust manifold of the engine.
    Type: Grant
    Filed: March 17, 1981
    Date of Patent: September 20, 1983
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Remi Curtil
  • Patent number: 4363293
    Abstract: A piston for a reciprocating piston machine, of the type swivelled by means of a piston pin to the associated connecting rod small and consisting of two members constituting the piston head and the piston skirt, assembled together by stud bolts. The central portion of the piston skirt is constituted by a cylindrical hollowed central boss, and the connection of the boss to the peripheral cylindrical surface of the piston skirt is by a peripheral annular crown. Said hollow of the central boss is provided with radial ribs.
    Type: Grant
    Filed: April 15, 1981
    Date of Patent: December 14, 1982
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventors: Bernard Munoz, Eric Tavenne
  • Patent number: 4341185
    Abstract: A valve housing for an internal combustion engine having more than one intake or exhaust valve per cylinder includes complementary upper 14 and lower 16 members, with a transverse junction plane 17 intersecting a longitudinal partition 10 which divides an annular cavity 9 between a central valve bushing and a circumferential wall of the housing into separate coolant supply and return sections 9a and 9b, respectively. An intermediate element 17 is interposed between said members and is provided with openings 19, 20 smaller angular extents than the corresponding coolant sections to provide for proper circulation of coolant between the portions of a given section (9a or 9b) of cavity 9 while permitting different angular relations between said members.
    Type: Grant
    Filed: December 4, 1979
    Date of Patent: July 27, 1982
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Jean-Pierre Pollet
  • Patent number: 4334409
    Abstract: A method and a device for recovering energy from a supercharged internal-combustion engine by producing a complementary amount of energy from a system operating on a Rankine cycle, includes preheating the working fluid used in the Rankine cycle through heat exchange with the air issuing from the compressor of the supercharger of the internal-combustion engine.
    Type: Grant
    Filed: February 20, 1980
    Date of Patent: June 15, 1982
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Claude Daugas
  • Patent number: 4327678
    Abstract: A support device for the set of rockers of an internal combustion engine, the device comprising a forked rocker for the operation of two exhaust valves and one rocker with two arms for the operation of two inlet valves. The shaft of the exhaust rocker is secured to the support block by separate individual stud bolts in order to be removable without removing the inlet rocker.
    Type: Grant
    Filed: January 4, 1980
    Date of Patent: May 4, 1982
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Jean-Pierre Pollet
  • Patent number: 4296715
    Abstract: This invention relates to a method and devices for improving the external cooling of an exhaust valve of internal combustion engines. This method consists in extending the open period of the exhaust valve beyond the normal closing instant by preventing it from closing completely at that instant but by reducing the free flow section between the valve and its seat to a residual value which is substantially constant and small compared to the maximum flow section corresponding to the full opening of the valve. Said devices comprise means for obtaining such residual opening of the exhaust valve.
    Type: Grant
    Filed: February 2, 1979
    Date of Patent: October 27, 1981
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventors: Remi Curtil, Alain Devaux
  • Patent number: 4288988
    Abstract: Method and exhaust manifold for damping the pressure oscillations in an exhaust manifold of an internal combustion engine, consisting in throttling the gas flow in the vicinity of the cylinder outlet and then in accelerating the gases flowing in the manifold by providing a uniform flow section in the manifold substantially smaller than that of the cylinder bore.
    Type: Grant
    Filed: January 18, 1978
    Date of Patent: September 15, 1981
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Remi Curtil
  • Patent number: 4262638
    Abstract: A valve, in particular for an internal combustion engine, of the mushroom type cooled by forced circulation of a cooling fluid, comprising a valve stem having at least two longitudinal cooling passage-ways and a valve head being provided with a substantially peripheral cooling passage-way extending in a substantially parallel plane to the lower plane surface of the head and with at least two substantially radial passage-ways connecting the said longitudinal passage-ways to the said peripheral passage-way, wherein said passage-ways provided in the said valve head are constituted by rectilinear passage-way lengths extending from the periphery of said head and opening outwardly, said peripheral passage-way being in the shape of a polygon, and said rectilinear passage-ways are obturated at their outward opening.
    Type: Grant
    Filed: September 25, 1979
    Date of Patent: April 21, 1981
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Jean P. Coulin
  • Patent number: 4232641
    Abstract: A method for improving the efficiency of an internal combustion engine such as a Diesel engine, by ensuring, on the one hand, efficient cylinder scavenging, particularly at light engine loads and/or low speeds, and on the other hand, a reduction of the effective compression ratio resulting in temperature reduction preferably under high engine loads and/or at high speeds. Said method consists in creating, for each engine cylinder and each engine cycle, a reserve of compressed air, during the intake stage, with the intake air and in compressing it by retarding the closing of the intake valve. A non-return valve is accommodated in the intake conduit and said gas reserve is contained in the space between the intake valve and the non-return valve.
    Type: Grant
    Filed: March 2, 1978
    Date of Patent: November 11, 1980
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Remi Curtil
  • Patent number: 4226216
    Abstract: A method of improving the effectiveness of braking a reversible four-stroke V type Diesel engine with an even number of at least ten working cylinders fitted with individual starting valves sequentially fed from an engine-driven rotary pressure air distributor, the method consisting in reducing the duration of pressure air inlet to the distributor for one bank of cylinders with respect to the other bank and optimizing such a shortened duration for each starting valve of one bank of cylinders during the braking step and possibly optimizing that for each starting valve of the other bank of cylinders for the restarting step.
    Type: Grant
    Filed: August 16, 1977
    Date of Patent: October 7, 1980
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Dirk Bastenhof
  • Patent number: 4196593
    Abstract: A supercharger set for internal combustion engines comprising two turboblowers the two axes of which being mutually perpendicular. The high-pressure turbine is mechanically coupled to the high-pressure compressor, whereas the low-pressure turbine is mechanically coupled to the low-pressure compressor. A single casing is used for the egress of the gases from the high-pressure turbine and their ingress into the low-pressure turbine.
    Type: Grant
    Filed: November 16, 1977
    Date of Patent: April 8, 1980
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Jacques E. M. Froeliger
  • Patent number: 4195610
    Abstract: A method and a device for stopping a fuel-injection internal combustion engine, in which the injection pump is of the multi-cylinder single-housing type, comprising in supplying the housing of the pump with pressurized gas for separating the pump plungers and tappets from their actuating cams.
    Type: Grant
    Filed: July 13, 1978
    Date of Patent: April 1, 1980
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Dirk Bastenhof
  • Patent number: 4182282
    Abstract: The invention provides a mushroom valve housing comprising a cage (1) and a guide (2), Cage (1) comprises legs (3, 4, 5, 6) supporting a valve seat (7) containing an annular space (8). Guide (2) has an annular cavity (9) with two sections (9a, 9b) communicating with space (8) by passages (11 to 14). One passage (12) among the two passages (11, 12) connected to a same section (9b) freely opens into this section whereas the other passage (11) communicates directly with the other section (9a), the passages (11, 13) of two diametrically opposite legs (3, 5) communicating with a same section (9a).
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: January 8, 1980
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Jean-Pierre Pollet
  • Patent number: 4161161
    Abstract: In a device for injecting liquid fuel in a combustion chamber of an internal combustion engine, a pressure accumulator chamber connected through a narrow passage with an injection conduit between an injection pump and an injector and intended to suppress or reduce the pressure oscillations appearing in the injection conduit at the end of an injection stage.
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: July 17, 1979
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Dirk Bastenhof
  • Patent number: 4143319
    Abstract: A method for determining the degree of the wear condition of a piston ring in sliding contact with a cylinder wall of an internal combustion engine. The piston ring has a defined magnetic property which property in sliding contact with the wall may be varied by a chromium plating. The reluctance of a magnetic field of an inductive sensor located in the cylinder wall is varied as the piston ring reciprocates and wears. The reluctance variation is compared with a predetermined reference level of the magnetic property for an acceptable degree of wear for the ring.
    Type: Grant
    Filed: June 10, 1976
    Date of Patent: March 6, 1979
    Assignee: Societe d'Etudes de Machines Thermiques S.E.M.T.
    Inventor: Jean S. R. Rouam