Patent ID: 11933424
Assignee: CATERPILLAR INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 9:
10. An engine comprising:
a source of pressurized gas;
at least one cylinder;
an intake manifold selectively fluidly coupled to the at least one cylinder;
a gas admission valve assembly including:
a housing including a central bore defining a central axis, an entry chamber disposed about said central axis, at least one gas entry opening that opens into the entry chamber, the at least one gas entry opening being fluidly coupled to the source of pressurized gas, a gas exit opening that opens into the entry chamber, a valve seat disposed about the gas exit opening, the gas exit opening and the valve seat being concentrically disposed about the central axis;
a valve including a valve head and a valve stem, the valve stem having a peripheral surface, a distal stem end and a proximal stem end, the valve head being disposed at the distal stem end of the valve stem, the valve stem being slidably disposed for movement along the central axis of the housing to selectively move the valve head into and out of contact with the valve seat, the valve head blocking flow between the entry chamber and the gas exit opening when the valve head is in contact with the valve seat, the gas exit opening being fluidly coupled to the intake manifold when the valve head is not in contact with the valve seat;
an elongated valve guide concentrically disposed about a portion of the valve stem between the valve stem and the central bore of the housing, the valve stem being slidably disposed within the elongated valve guide for movement along the central axis, the valve guide having a proximal guide end and a distal guide end;
a first stem seal disposed distally the elongated valve guide in sealing engagement with the peripheral surface of the valve stem and the central bore of the housing to inhibit flow of gas from the entry chamber between the valve stem and the housing; and
a second stem seal including a second sealing element and a support, the support including a vertical element and a horizontal element, the vertical element being disposed substantially parallel to the valve stem, the second sealing element being disposed proximally the elongated valve guide in sealing engagement with the peripheral surface of the valve stem at the proximal guide end, the second sealing element being disposed between and in sealing engagement with the vertical element and the peripheral surface of the valve stem.