Drive shaft seal for gasoline direct injection pump

A shaft seal for an injection supply pump comprising a housing defining a sump, a plurality of radial plungers reciprocated by an eccentric fixed to a rotating shaft, wherein radial force is delivered from said eccentric to a radially inward head of said plungers by a shoe race surrounding said eccentric, said shaft seal comprising:

• a diaphragm surrounding a central axis, said diaphragm comprising:
• an outer flange radially spaced from said central axis and sealingly fixed to said pump housing;
• inner sealing means for sealingly fixing said seal to said shoe race;
• and
• a flexible portion intermediate said bushing receptacle and said outer flange and generally parallel to said outer flange,
• wherein said outer flange and flexible portion are formed from a homogeneous continuous sheet and said sheet provides a fluid impervious barrier containing a combustion fluid in said sump and no part of said shaft seal is in sliding contact with said shaft.

A drive shaft seal comprising:

• means for providing a sliding interface with a rotating drive shaft;
• and
• a generally circular sheet of fluid impervious material comprising:
• an outer flange;
• and
• a corrugated portion between said outer flange and an axial shaft opening, said corrugated portion comprising a plurality of concentric repeating bends in said sheet,
• wherein said bushing lip is fixed and sealed to said means for providing a sliding interface to provide a fluid impervious barrier extending radially from said means for providing a sliding interface and said flexible portion permits relative movement between said means for providing a sliding interface and said outer flange.