| 摘要 |
A variable volume apparatus for an internal combustion engine includes a cylinder (22) and a piston (40) sliding in the cylinder bore (24) and having a sphere shape (60) cut by two parallel planes (102, 104) on either side of its major horizontal diameter. The upper side (58) of this twice truncated sphere is solid and its underside is hollow. A short threaded stem (70) is mounted in the center of the piston (40) for rigid attachment to the connecting rod (42). The spherically contoured sidewalls of the piston (40) are thin and the contour (87) of the inner walls match the contour (60) of the outer walls. These thin side walls expand slightly and can distort slightly to maintain a tight seal between the piston (40) and the cylinder (22). A bevelled lip (62) rings the bottom of the spherical side walls and angles in towards the center of the piston (40) to provide lubricating and cooling for the piston side wall of the piston. |
