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    2.
    发明专利
    未知

    公开(公告)号：BR8807857A

    公开(公告)日：1990-11-13

    申请号：BR8807857

    申请日：1988-12-23

    Applicant: CATERPILLAR INC

    Inventor： WEBER ROBERT L ,  KAMMAN KENNETH R ,  BALLHEIMER BENNY ,  SHOUP STEPHEN G

    IPC: F01P3/08 ,  F02B3/06 ,  F02B23/06 ,  F02F3/00 ,  F02F3/22

    Abstract: Present day diesel engines having aluminum piston assemblies are limited to combustion chamber pressures of approximately 12,410 kPa (1,800 psi) whereas the desire is to increase such pressures up to the 15,170 kPa (2,200 psi) range. To reach such levels the instant engine has a piston assembly including a steel piston member having an upper cylindrical portion of a diameter D and defining a top surface, a depending tubular wall having a top ring groove a minimal elevational distance TRH below the top surface, and an annular cooling recess located beneath the top surface and juxtaposed to the top ring groove for removing heat away therefrom in use. The piston member is preferably forged and subsequently machined to precisely controllable dimensions, and has a ratio of TRH to D of less than 0.06. Moreover, the piston assembly is preferably of the articulated type and includes a forged aluminum piston skirt connected to the piston member through a common wrist pin. The skirt has an upwardly facing oil trough that is disposed in a cooperating relationship with the cooling recess of the piston member. A midsupported cylinder liner surrounds the piston assembly and a recess is provided thereabout at an elevation aligned with the top ring groove for maximizing cooling.

    ENGINE INCLUDING A PISTON MEMBER HAVING A HIGH TOP RING GROOVE
    3.
    发明专利
    ENGINE INCLUDING A PISTON MEMBER HAVING A HIGH TOP RING GROOVE 未知

    公开(公告)号：CA1331151C

    公开(公告)日：1994-08-02

    申请号：CA609577

    申请日：1989-08-28

    Applicant: CATERPILLAR INC

    Inventor： WEBER ROBERT L ,  KAMMAN KENNETH R ,  BALLHEIMER BENNY ,  SHOUP STEPHEN G

    IPC: F01P3/08 ,  F02B3/06 ,  F02B23/06 ,  F02F3/00 ,  F02F3/22

    Abstract: ENGINE INCLUDING A PISTON MEMBER HAVING A HIGH TOP RING GROOVE Present day diesel engines having aluminum piston assemblies are limited to combustion chamber pressures of approximately 12,410 kPa (1,800 psi) whereas the desire is to increase such pressures up to the 15,170 kPa (2,200 psi) range. To reach such levels the instant engine has a piston assembly including a steel piston member having an upper cylindrical portion of a diameter D and defining a top surface, a depending tubular wall having a top ring groove a minimal elevational distance TRH below the top surface, and an annular cooling recess located beneath the top surface and juxtaposed to the top ring groove for removing heat away therefrom in use. The piston member is preferably forged and subsequently machined to precisely controllable dimensions, and has a ratio of TRH to D of less than 0.06. Moreover, the piston assembly is preferably of the articulated type and includes a forged aluminum piston skirt connected to the piston member through a common wrist pin. The skirt has an upwardly facing oil trough that is disposed in a cooperating relationship with the cooling recess of the piston member. A midsupported cylinder liner surrounds the piston assembly and a recess is provided thereabout at an elevation aligned with the top ring groove for maximizing cooling.

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