Claims:1. A high pressure fuel pump (10), said high pressure fuel pump (10) comprising:
10 a housing;
a bearing housing (14) secured to said housing of said high pressure fuel pump
(10), said bearing housing (14) adapted to be stationary with respect said
housing of said high pressure fuel pump (10);
a bump shaped foil (16) positioned within said bearing housing (14) and
15 circumscribes said bearing housing (14), wherein a first end of said bump
shaped foil (16) and an opposite second end of said bump shaped foil (16) are
spaced apart from each other within said bearing housing (14);
a top foil (18) positioned within said bump shaped foil (16) and circumscribes
said bump shaped foil (16), wherein a first end of said top foil (18) and an
20 opposite second end of said top foil (18) are spaced apart from each other
within said bump shaped foil (16);
a shaft (20) positioned within said top foil (18) and adapted to rotate within
said top foil (18), wherein an outer circumference of said shaft (20) is separated
from said top foil (18) by a clearance, and wherein a radial load acted on said
25 shaft (20) causes the outer circumference of said shaft (20) to contact against
an inner surface of said top foil (18); characterized in that
a coating of korolon deposited on the inner surface of said top foil (18), the
coating of korolon that is deposited on the inner surface of said top foil (18)
adapted to reduce friction between said shaft (20) and said top foil (18), thereby
30 reducing a degree of wear of said top foil (18) of said high pressure fuel pump
(10) when said shaft (20) contacts against the inner surface of said top foil (18). , Description:A high pressure fuel pump 10 is described. The high pressure fuel pump 10 comprises
a housing and a bearing housing 14 secured to the housing. A bump shaped foil 16 is
positioned within the bearing housing 14. A top foil 18 is positioned within the bump
10 shaped foil 16. A shaft 20 is positioned within the top foil 18. A radial load acted on
the shaft 20 causes an outer circumference of the shaft 20 to contact against an inner
surface of the top foil 18. A coating of korolon is deposited on the inner surface of the
top foil 18 to reduce friction between the shaft 20 and the top foil 18, thereby reducing
a degree of wear of the top foil 18 of the high pressure fuel pump 10 when the rotating
15 shaft 20 contacts against the inner surface of the top foil 18.