Lash compensator spring end cap
AssigneeSchaeffler Technologies AG & Co. KG
InventorJohn Stallmann
Life of this patent
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Abstract
A lash compensator for a valve train component of an internal combustion engine is provided that includes an end-cap arranged within a reverse-spring control valve assembly of an axially moveable piston. The piston has a first reservoir and an inner radial wall configured with a through-aperture. The reverse-spring control valve assembly has a control valve housing, a bias spring, an end-cap, and a closing body. The end-cap is configured with a cupped end; an inner side of the cupped end receives a second lower end of the bias spring, and an outer side of the cupped end engages an upper portion of the closing body. The end-cap minimizes or eliminates the variation in flow resistance caused by a variation in end-coil geometry of the second lower end of the bias spring.
Claims18
A lash compensator for a valve train of an internal combustion engine comprising:
- a central axis;
- a piston assembly configured for axial movement within a bore of an outer housing, the piston assembly including:
- a piston having:
- a first reservoir;
- and,
- an inner radial wall configured with a through-aperture;
- and,
- a control valve assembly having:
- a control valve housing configured with at least one fluid port, a first side of a retaining end of the control valve housing engaged with a bottom surface of the piston;
- a bias spring axially aligned with the through-aperture, a first upper end of the bias spring engaged with the bottom surface of the piston;
- and,
- an end-cap configured with a cupped end, an inner side of the cupped end receiving a second lower end of the bias spring and an outer side of the cupped end engaging an upper portion of a closing body, the closing body axially guided by the control valve housing to move from a first open position to a second closed position.
A lash compensator for a valve train of an internal combustion engine comprising:
- a piston assembly configured for axial movement within a bore of an outer housing, the piston assembly including:
- a piston having:
- a first reservoir;
- and,
- a through-aperture arranged within an inner radial wall;
- and,
- a control valve assembly having:
- a control valve housing configured with at least one fluid port, a first side of a retaining end of the control valve housing engaged with a bottom surface of the piston;
- a bias spring axially aligned with the through-aperture, a first upper end of the bias spring engaged with the bottom surface of the piston;
- and,
- an end-cap configured with a cupped end, an inner side of the cupped end receiving a second lower end of the bias spring and an outer side of the cupped end engaging an upper portion of a closing body;
- the closing body axially disposed within and guided by the control valve housing to move from a first open position to a second closed position;
- the closing body engaging a stop arranged on the control valve housing in the first open position, the stop located at an end opposite the retaining end;
- and,
- the closing body engaging a valve seat formed on the bottom surface of the piston in the second closed position;
- and
- a return resilient element having a third upper end engaged with a second side of the retaining end of the control valve housing and a fourth lower end engaged with a bottom surface of the bore of the housing.
Dependencies are inferred from the claim text.