Bi-directional clip seal piston

Patent metadata

Field	Value
Publication number	US-9410624-B2
Application number	US-201113313151-A
Country	US
Kind code	B2
Filing date	Dec 7, 2011
Priority date	Dec 22, 2010
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

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.

First claim

I claim:

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.

Assignees

• George Philip
• Schaeffler Technologies Ag

Inventors

• George Philip

Classifications

• F16D25/082

  the line of action of the fluid-actuated members co-inciding with the axis of rotation · CPC title

• F16D2300/08

  Details or arrangements of sealings not provided for in group F16D3/84 · CPC title

• F16J1/008 Primary

  with sealing lips · CPC title

• F15B15/1452

  Piston sealings · CPC title

• F16D25/12

  Details not specific to one of the before-mentioned types · CPC title