초록 ▼

A piston assembly for a double-acting engine such as a double-acting Stirling engine. A pair of sealing rings located on opposite sides of a sealing washer are positioned between a base section and a dome section of a piston head. These sealing rings are alternatively urged into sealing engagement w

A piston assembly for a double-acting engine such as a double-acting Stirling engine. A pair of sealing rings located on opposite sides of a sealing washer are positioned between a base section and a dome section of a piston head. These sealing rings are alternatively urged into sealing engagement with the cylinder bore as the piston reciprocates. A single sealing ring design is also disclosed in which the sealing ring is urged into constant sealing engagement by positive pressure accumulated with an interior cavity in the piston head.

대표청구항 ▼

[ We claim:] [1.] A piston assembly for reciprocation within a cylinder bore of a double-acting hot gas engine including a double-acting Stirling engine, said piston assembly comprising:a piston rod,a piston head, attached to said piston rod, forming an annular clearance space, having connected base

[ We claim:] [1.] A piston assembly for reciprocation within a cylinder bore of a double-acting hot gas engine including a double-acting Stirling engine, said piston assembly comprising:a piston rod,a piston head, attached to said piston rod, forming an annular clearance space, having connected base and dome sections and a radially outer-most surface, said dome section having an interior cavity,a sealing washer located in said annular clearance space, having first and second opposed flat surfaces and radially inner-most and outer-most surfaces,a first sealing ring, formed of elastic low friction material, having radially inner-most and outer-most surfaces, located in said annular clearance space between said sealing washer and said base section of said piston head and positioned in direct engagement with said first opposed flat surface of said sealing washer, said radially inner-most surface of said first sealing ring separated from said sealing washer and said base section of said piston head by a first actuating cavity, said first sealing ring and said base section of said piston head forming a first ring passageway allowing working fluid to be exchanged between said first actuating cavity and said cylinder bore, anda second sealing ring, formed of elastic low friction material, having radially inner-most and outer-most surfaces, located in said annular clearance space between said sealing washer and said dome section of said piston head and positioned in direct engagement with said second opposed flat surface of said sealing washer, said radially inner-most surface of said second sealing ring separated from said sealing washer and said dome section of said piston head by a second actuating cavity, said second sealing ring and said dome section of said piston head forming a second ring passageway allowing working fluid to be exchanged between said second actuating cavity and said cylinder bore.