Expansible chamber devices – With assembly or disassembly facilitating means
Patent
1997-01-28
1998-07-07
Freay, Charles G.
Expansible chamber devices
With assembly or disassembly facilitating means
92129, 417470, F01B 2900
Patent
active
057752036
ABSTRACT:
A high pressure fuel pump unit and assembly is provided which includes a pump barrel containing a bore, a pump plunger mounted in the bore for reciprocal movement between an advanced position and a retracted position, and a force transmitting device for transmitting axial loads to the plunger while minimizing side loads on the plunger. The force transmitting device includes an extension member extending into the inner radial extent of a bias spring and including a distal supporting end positioned in uncoupled abutment against a driven end of the pump plunger to form a decoupled force transmitting interface. The pump plunger and extension member are capable of relative lateral movement at the decoupled force transmitting interface which is positioned a spaced axial distance from the outer end of the pump barrel when the pump plunger is in the advanced position. The extension member is specifically formed with a predetermined axial length to minimize the spaced axial distance between the outer end of the pump barrel and the decouple force transmitting interface so as to minimize the leverage effect of any side loading and maximize the support provided to plunger by barrel throughout reciprocation of the plunger. The distal supporting end of the extension member may include a flat surface positioned in a single bearing plane wherein the extension member is positioned entirely on one side of the bearing plane to minimize the spaced axial distance.
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Black John W.
Osborn J. Christopher
Brackett Jr. Tim L.
Cummins Engine Company, Inc.
Freay Charles G.
Leedom Jr. Charles M.
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