Title:
WATER PUMP AND ASSEMBLY METHOD FOR WATER PUMP
Document Type and Number:
WIPO Patent Application WO/2016/006357
Kind Code:
A1
Abstract:
The present invention comprises a drive shaft (7) formed from a synthetic resin material, a pulley (5) provided to be integrally rotatable with a large diameter shaft portion (7a) side of the drive shaft, and an impeller (8) formed from a synthetic resin material and fitted astride an intermediate shaft portion (7b) and small diameter shaft portion (7c) by means of a fitting hole (23), wherein first and second step portions (22, 24) that delimit the maximum fitting position of the impeller in the axial direction are provided between the other end of the drive shaft and the fitting hole, a pushnut (25) that, in concert with the first and second step portions, restricts the movement of the impeller (8) in the axial direction at the maximum fitting position is provided to a projection (7d) on the impeller front surface side of the drive shaft, the cross section of a fitting part (20) of the intermediate shaft portion is cocoon-shaped, and the cross section of a large diameter fitting aperture portion (23a) is the same cocoon shape as the fitting part (20). Consequently, the coupling force between the impeller and the drive shaft is improved and it is possible to restrict the slipping of the impeller with respect to the drive shaft and disengagement from the drive shaft.
Inventors:
FURUSAWA YUSUKE (JP)
Application Number:
PCT/JP2015/065359
Publication Date:
January 14, 2016
Filing Date:
May 28, 2015
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F04D29/20; F04D29/043; F04D29/22; F04D29/60
Foreign References:
| JP2012112341A | 2012-06-14 | |||
| JP2012077643A | 2012-04-19 | |||
| JP2007205246A | 2007-08-16 | |||
| EP2119918A2 | 2009-11-18 | |||
| US20070036660A1 | 2007-02-15 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
Hiromichi Kobayashi (JP)
Hiromichi Kobayashi (JP)
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