US 9,810,240 B2
Water pump and method for producing water pump
Yusuke Furusawa, Novi, MI (US); and Masahiko Watanabe, Yokohama (JP)
Assigned to Hitachi Automotive Systems, Ltd., Hitachinaka-shi (JP)
Appl. No. 15/108,102
Filed by Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki (JP)
PCT Filed Nov. 4, 2014, PCT No. PCT/JP2014/079208
§ 371(c)(1), (2) Date Jun. 24, 2016,
PCT Pub. No. WO2015/098293, PCT Pub. Date Jul. 2, 2015.
Claims priority of application No. 2013-270934 (JP), filed on Dec. 27, 2013.
Prior Publication US 2016/0319831 A1, Nov. 3, 2016
Int. Cl. F04D 29/42 (2006.01); F04D 29/10 (2006.01); F04D 29/04 (2006.01); F04D 29/12 (2006.01); F04D 29/043 (2006.01); F01P 5/10 (2006.01); F04D 13/02 (2006.01); F01P 7/14 (2006.01); F04D 1/00 (2006.01)
CPC F04D 29/426 (2013.01) [F01P 5/10 (2013.01); F04D 13/02 (2013.01); F04D 29/04 (2013.01); F04D 29/043 (2013.01); F04D 29/106 (2013.01); F04D 29/126 (2013.01); F04D 29/4266 (2013.01); F01P 2007/143 (2013.01); F04D 1/00 (2013.01); F05B 2260/602 (2013.01); F05B 2260/603 (2013.01); F05D 2260/4021 (2013.01); F05D 2260/6022 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A water pump comprising:
a pump housing having a cylindrical portion at an axial end;
a drive shaft rotatably supported in the pump housing;
a pulley including a discal end wall that is connected to an end portion of the drive shaft and a cylindrical base part that is integrally connected to an outer periphery of the discal end wall and shaped to surround the cylindrical portion;
a bearing that is interposed between the cylindrical base part and the cylindrical portion to rotatably bear the drive shaft; and
an impeller that is connected to the other end of the drive shaft to rotate integrally, wherein
the discal end wall is formed with a plurality of through openings that communicate an inside with an outside of the discal end wall,
relative to a rotational axis of the water pump, each of the through openings defines, at a location on each through opening that is most radially distant from the rotational axis of the water pump, a pathway groove that extends substantially along an inner cylindrical surface of the cylindrical base part,
an opening area of the pathway groove is smaller than that of the corresponding through opening,
a width of the pathway groove is reduced as the pathway groove extends radially outward, and
the pathway groove extends through the discal endwall along a direction that is parallel to a longitudinal axis of the drive shaft.