Bi-directional clip seal piston
View Patent ↗A piston assembly, comprising: a back plate with an axially extending extrusion continuously circumferentially disposed about the back plate; a piston including an indent circumferentially disposed proximate an outer circumference for the piston plate; and a sealing element at least partially disposed in the indent. The piston is fixed to the back plate with a plurality of extruded rivets such that the extrusion forms a liquid-tight seal against a surface of the piston. The indent is open in an axial direction facing the back plate. The extrusion is radially inward of the plurality of extruded rivets.
1. A piston assembly, comprising:
an axis;
a back plate with a circumferentially disposed axial extrusion;
a piston including:
a plurality of raised areas; and,
an indent radially outward of the raised areas and circumferentially disposed proximate an outer circumference for the piston;
a plurality of fasteners:
extending axially from the plurality of raised areas, and,
fixing the back plate to the piston;
at least one space:
axially disposed between the back plate and the piston; and,
circumferentially disposed between first and second raised areas included in the plurality of raised areas; and,
a sealing element at least partially disposed in the indent, wherein:
the plurality of fasteners are radially located between the sealing element and the axis; and,
the extrusion is in direct contact with the piston and forms a seal against a surface of the piston.
2. The piston assembly of claim 1 , wherein the extrusion is radially inward of the plurality of fasteners.
3. The piston assembly of claim 1 , wherein the extrusion is continuous in a circumferential direction.
4. The piston assembly of claim 1 , further comprising a longitudinal axis, wherein:
the plurality of fasteners are at a first uniform radial distance from the longitudinal axis; and,
the extrusion is at a second uniform radial distance, less than the first radial distance, from the axis.
5. The piston assembly of claim 1 , wherein the extrusion creates a liquid-tight seal between a portion of the piston radially outward of the extrusion and a portion of the piston radially inward of the extrusion.
6. The piston assembly of claim 1 , wherein the indent includes only one radially disposed portion and only one circumferentially disposed portion.
7. The piston assembly of claim 1 , wherein the piston assembly is arranged to be placed within a housing such that the sealing element creates a seal with the housing.
8. The piston assembly of claim 7 , wherein the housing is part of a transmission housing.
9. The piston assembly of claim 1 , wherein:
at least a portion of the sealing element is axially disposed between the back plate and the piston; and,
the back plate and the piston restrain the sealing element in an axial direction.
10. A piston assembly, comprising:
a back plate with an axially extending extrusion continuously circumferentially disposed about the back plate;
a piston including:
a plurality of raised areas;
an indent radially outward of the raised areas and circumferentially disposed proximate an outer circumference for the piston; and,
a plurality of extruded rivets:
extending from the plurality of raised areas; and,
fixing the back plate to the piston;
at least one space:
axially disposed between the back plate and the piston; and,
circumferentially disposed between first and second raised areas included in the plurality of raised areas; and,
a sealing element at least partially disposed in the indent, wherein:
the piston is fixed to the back plate with the plurality of extruded rivets such that the extrusion is in direct contact with the piston and forms a liquid-tight seal against a surface of the piston;
the indent is open in an axial direction facing the back plate; and,
the extrusion is radially inward of the plurality of extruded rivets.