Rotary piston engine
AssigneeWankel GmbH
InventorDankwart Eiermann
Life of this patent
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Abstract
A rotary piston engine in which the housing has an opening in at least one end wall that is controlled by the piston. The end seals on the piston and the sealing bolts at the juncture thereof are located radially inwardly from the opening, while the corner seals of the piston have legs at the ends of the piston extending to the sealing bolts. The corner seals are disposed in planes which in the radially inward direction diverge from the radial planes of the piston passing through the corners of the piston.
Claims13
A rotary piston machine for operation by introduction of air into a compression chamber, said machine comprising a housing having a multi-arc peripheral inner surface of epitrochoidal cross section and end walls in planes perpendicular to said peripheral wall, and a multi-corner piston rotatable in said housing with its corners in sealing contact with said peripheral surface to form a plurality of working chambers, said piston having radial planes extending through the axis of said piston and said corners, one of said end walls of said housing having an inlet opening adjacent the peripheral wall to admit air under pressure into a working chamber, said rotary piston having a plurality of seal strips on each end wall to engage said end walls of the housing, said seal strips extending substantially circumferentially and disposed radially inwardly of the radial inner limit of said inlet opening to seal the working chambers outwardly of said seal strips, sealing bolts radially inwardly of the radial inner limit of said inlet opening and positioned rearwardly in rotational direction of said piston relative to the radial planes through the corners of said piston, the path of said sealing bolts lying inwardly of said inlet opening, the ends of said seal strips intersecting said bolts, a corner seal on each corner of said piston, said corner seal having a strip across the corner of said piston engaging said peripheral inner surface and legs extending inwardly and rearwardly from the radial plane through the corner relative to rotation of said piston, said legs intersecting said sealing bolts, so that the seal strip and corner seal leg on the corner of the piston leaves a large free area on the end of said piston forward of said corner seal leg and provides maximum admission of air through said inlet opening in the compression chamber.
A rotary piston machine for operation by introduction of air into a compression chamber said machine comprising a housing having a multi-arc peripheral inner surface of epitrochoidal cross section and end walls in planes perpendicular to said peripheral wall, and a multicorner piston rotatable in said housing with its corners in sealing contact with said peripheral surface to form a plurality of working chambers, said piston having radial planes extending through the axis of said piston and said corners, one of said end walls of said housing having an inlet opening adjacent the peripheral wall to admit air under pressure into a working chamber said rotary piston having a plurality of seal strips on each end wall to engage said end walls of the housing, said seal strips extending substantially circumferentially and disposed radially inwardly of the radial inner limit of said inlet opening to seal the working chambers outwardly of said seal strips, sealing bolts radially inwardly of the radial inner limit of said inlet opening and positioned rearwardly in rotational direction of said piston relative to the radial planes through the corners of said piston, the ends of said seal strips intersecting said bolts, a corner seal on each corner of said piston, said corner seal being positioned in a groove in said piston extending transversely across the corner of said piston and radially inwardly along the end walls of said piston to said sealing bolts, said corner seal comprising a transverse sealing strip in said transverse groove in said corner and inwardly extending sealing legs in the grooves in said end walls and in sealing engagement with said transverse strip and said sealing bolts, and a spring in said transverse groove and in engagement with said strips to press said transverse corner strip radially outwardly into engagement with said peripheral wall and said corner strips axially into engagement with the end walls of said chamber, the seal strip and corner seal leg on the corner of said piston and on the piston end wall opposite the chamber end wall with said inlet opening leaving a large free area on the end of said piston forward of said corner seal leg at least as large as the area of said inlet opening, thereby providing maximum admission of air through said inlet opening in the compression chamber.
In a rotary piston engine;
- a housing with a piston chamber having a peripheral wall and end walls and a multi-corner piston in the chamber also having a peripheral wall and end walls, an opening formed in one end wall of said chamber, end seal strips on the ends of said piston to engage the end walls of said chamber and disposed radially inwardly from the radially inner limit of said opening, sealing bolts at each end of the piston at the juncture of the respective said strips, and corner seal elements at the corners of said piston and including legs extending inwardly along the ends of said piston to said sealing bolts, each of the corner seal elements being mounted in a groove provided therefor in said piston, each groove when viewed in the axial direction of the piston being disposed in a plane which inclines rearwardly of the piston from the radial plane of the piston which passes through the respective corner of the piston, said piston having an axial recess for each sealing bolt, the piston furthermore comprising a passage formed therein communicating the bottom of each recess with region of the groove for the adjacent corner seal element which is radially outward from the said recess.
In a rotary piston engine;
- a housing with a piston chamber having a peripheral wall and end walls and a multi-corner piston in the chamber also having a peripheral wall and end walls, an opening formed in one end wall of said chamber, end seal strips on the ends of said piston to engage the end walls of said chamber and disposed radially inwardly from the radially inner limit of said opening, sealing bolts at each end of the piston at the juncture of the respective said strips, corner seal elements at the corners of said piston and including legs extending inwardly along the ends of said piston to said sealing bolts, each sealing bolt being larger in diameter than the thickness of the respective corner seal element and having a slot to receive the respective corner seal element, and a closure bolt coaxial with said sealing bolt and sealing said slot against the passage of gas.
Dependencies are inferred from the claim text.