Back to results
US 2009/0136374 A1Published application
Vane Pump
AssigneeShowa Corporation
InventorsYoshihiro Tsukahara, Tomohiro Tanaka
Life of this patent
Estimating the term…
Abstract
Provided is a vane pump. In the vane pump, a high-hardness main coating layer is provided on a distal end portion of each vane, and an intermediate coating layer having an intermediate hardness between a hardness of a base material of the vane and a hardness of the main coating layer is provided between the base material of the vane and the main coating layer.
Claims20
A vane pump in which vanes are received into grooves formed at a plurality of circumferential positions of a rotor fixed to a pump shaft, and distal end portions of the vanes are pressed and slid on a cam ring, comprising:
- an intermediate coating layer provided on a base material of the distal end portion of each of the vanes;
- a high-hardness main coating layer provided on the intermediate coating layer;
- and
- the intermediate coating layer has an intermediate hardness between a hardness of the base material of the vane and a hardness of the main coating layer.
1 more element
Dependencies are inferred from the claim text.