Rotary kinetic fluid motors or pumps – Including shaft transmission train – brake – clutch – or... – Shaft transmission train having flexible means or coupling
Reexamination Certificate
2002-05-22
2004-07-20
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Including shaft transmission train, brake, clutch, or...
Shaft transmission train having flexible means or coupling
C415S229000, C415S915000
Reexamination Certificate
active
06764278
ABSTRACT:
FIELD OF THE INVENTION
This invention generally relates to a water pump mechanism. More particularly, the present invention pertains to a water pump which is used for a vehicle.
BACKGROUND OF THE INVENTION
A known water pump for a vehicle use is disclosed in U.S. Pat. No. 4,966,572. This known water pump, as shown in
FIG. 4
, includes an impeller
41
and a pulley
42
, and the pulley
42
is press-fitted to a shaft which rotates integrally with the impeller
41
, and the pulley
42
rotates by receiving the torque from outside. An outer ring of a bearing
43
is fitted to an inner ring of the pulley
42
which is press-formed with a steel plate, and a body
44
which is fitted in an inner periphery of the bearing
43
is supporting the pulley
42
through the bearing
43
. According to a required specification of an engine to which a water pump is assembled, a diameter of a pulley, which receives torque for driving a water pump, needs to be changed. However, because the known water pump is structured with the outer ring of the bearing
43
fitted to an inner surface of the pulley
42
, and the body
44
supports the pulley
42
through the bearing
43
, an outer diameter of the pulley
42
is not so different from an outer diameter of the bearing
43
. Therefore, the designing choice of the diameter of the pulley is limited.
Also, as a problem of a press-formed pulley, if a thick steel plate is press-formed to secure strength of the pulley, it is assumed that formation becomes difficult and a dimensional accuracy (cylindricality or vibration etc) of the press-formed pulley is reduced. On the other hand, if a thin steel plate is used for simplifying the formation process and improving the dimensional accuracy after formation, the strength of the pulley may decrease, and when the pulley is fitted to a bearing, the pulley may be deformed, impairing the dimensional accuracy (cylindricality or vibration, etc.), or the fitting strength between the pulley and the bearing may decrease.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a water pump includes a driven portion, a shaft which is connected to the driven portion, an impeller which is connected to the shaft, a body which supports the driven portion for relative rotation therewith through a bearing, characterized in that an outer surface of the bearing is fixed together with the driven portion, and the driven portion and the shaft are formed integrally by resin molding.
According to this aspect, a driving force, which is inputted to the driven portion, rotates the impeller through the shaft, which is integrally formed with the driven portion.
According to another aspect of the invention, the water pump includes the driven portion, the shaft which is connected to the driven portion, the impeller which is connected to the shaft, the body which supports the driven portion for relative rotation therewith through the bearing, characterized in that the outer surface of the bearing is fixed together with the driven portion, the driven portion is comprised of a pulley portion and an arm portion, the pulley portion is fixed to the arm portion, and the arm portion is fixed to the outer surface of the bearing and is connected to the shaft.
According to this aspect, the driving force, which is inputted to the driven portion comprised of the pulley portion and the arm portion, rotates the impeller through the shaft, which is connected to the driven portion.
REFERENCES:
patent: 4402647 (1983-09-01), Effenberger
patent: 4955786 (1990-09-01), Kunkel et al.
patent: 4966572 (1990-10-01), Kunkel et al.
patent: 5026253 (1991-06-01), Borger
patent: 5125795 (1992-06-01), Suzuki et al.
patent: 5217350 (1993-06-01), Kimura et al.
patent: 5224823 (1993-07-01), Cordts
patent: 5720685 (1998-02-01), Malone
patent: 6120243 (2000-09-01), Tanabe
patent: 6200089 (2001-03-01), Heer
patent: 2002/0034438 (2002-03-01), Ozawa et al.
patent: 0 289 958 (1988-04-01), None
patent: 1386937 (1973-04-01), None
patent: 63-302200 (1988-05-01), None
patent: 4-262096 (1990-12-01), None
European Search Report.
Ozawa Yasuo
Yamamoto Junya
A. Marquez, Esq. Juan Carlos
Aisin Seiki Kabushiki Kaisha
Edgar Richard A.
Fisher Esq. Stanley P.
Look Edward K.
LandOfFree
Water pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Water pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3191543