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US 5,690,471 AGranted
Water pump
AssigneesAisin Seiki Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha
InventorNorio Sasaki
Life of this patent
Estimating the term…
Abstract
A water pump includes a shaft to which an impeller has been attached, and a water pump housing in which the shaft is freely rotatably supported by a plain bearing. An annular mandrel having a lip seal fixedly secured to its distal end is inserted into an annular groove provided in the pump housing, thereby limiting the axial movement of the shaft.
Claims5
A water pump comprising:
- a water pump housing defining a pump chamber;
- a shaft having one end provided with rotating force transmitting means and another end on which an impeller is fitted, said shaft being freely rotatably supported in said water pump housing via a plain bearing;
- an annular mandrel attached on the outer periphery of said shaft between a portion of said shaft supported by said plain bearing and said rotating force transmitting means, said mandrel having a distal end that is inserted into an annular groove formed in said water pump housing at a position opposite to the side surface of said water pump housing;
- a first annular lip seal attached to the distal end of said annular mandrel, said first annular lip seal having portions which make contact with walls forming said annular groove;
- and
- second annular lip seals for providing a seal between said shaft and said water pump housing disposed on both sides of said annular mandrel axially of said shaft, and grease is filled in a space between said second annular lip seals.
3 more elements
Dependencies are inferred from the claim text.