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Water pump




Title: Water pump.
Abstract: A water pump is constructed to have a rotating member that is adapted to be rotated by an external driving source, a housing that forms a part of a pump chamber from which a cooling water is led to an internal combustion chamber for cooling the engine upon rotation of the rotating member, a mechanical seal unit that is installed between the housing and the rotating member to seal the pump chamber and a bearing that is operatively disposed between the rotating member and the housing at a position other than the pump chamber, in which an annular slinger is arranged at an axial end of the bearing and fixed to a fixed portion, the annular slinger having a given portion that slidably contacts to the rotating member. ...

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USPTO Applicaton #: #20120321489
Inventors: Shingo Murakami, Masahiko Watanabe, Hideaki Nakamura


The Patent Description & Claims data below is from USPTO Patent Application 20120321489, Water pump.

BACKGROUND

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OF THE INVENTION

1. Field of the Invention

The present invention relates in general to water pumps for pumping a cooling water that circulates in an engine cooling system of a motor vehicle, and more particularly to the water pumps of a type that provides a bearing of a rotating member with a watertight construction.

2. Description of the related Art

Japanese Laid-open Patent Application (Tokkai) 2010-169143 shows a water pump that has a watertight construction for a bearing of a rotating member.

In the water pump shown in the publication, there is disclosed a watertight construction between a cylindrical pump housing and a drive shaft that is concentrically and rotatably disposed in the pump housing. Between the pump housing and the drive shaft, there is disposed a ball bearing of a type that has two rows of balls for smoothing rotation of the drive shaft.

The watertight construction comprises a seal member that is fixed to the pump housing and has first and second lip portions slidably contacting with a flat portion formed on the drive shaft, and an annular slinger that is fixed to the drive shaft and has a peripheral portion to which a third lip (or axial lip) of the seal member slidably contacts. Due to the first and second lips that slidably contact to the flat portion of the drive shaft, there are defined two sealing portions by which water penetration into the ball bearing is restrained.

SUMMARY

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OF THE INVENTION

Although the watertight construction disclosed by the above-mentioned publication exhibits a watertight function to a certain extent due to provision of the two sealing portions, the sliding contact between the third lip and the annular slinger causes formation of an annular space in which water is collected, which however promotes the undesired penetration of water into the ball bearing from the annular space through the two sealing portions.

It is therefore an object of the present invention to provide a water pump which is free of the above-mentioned drawback.

According to the present invention, there is provided an improved watertight construction for a ball bearing installed in a water pump, that exhibits a satisfied watertight function by providing means by which water staying in the annular space is easily discharged therefrom.

In accordance with a first aspect of the present invention, there is provided a water pump which comprises a rotating unit including a pulley, a drive shaft and an impeller which rotate as a single unit; a housing covering the drive shaft and having a pump chamber for receiving therein the impeller; a mechanical seal unit installed between the housing and the drive shaft to seal the pump chamber; a bearing including an outer race fixed to one of the rotating unit and the housing, an inner race fixed to the other one of the rotating unit and the housing and a plurality of rotating bodies operatively disposed between the outer and inner races; an annular seal member arranged at an axial end of the bearing and having a peripheral portion that is fixed to one of the outer and inner races and another peripheral portion that slidably contacts with the other one of the outer and inner races; and an annular slinger fixed to the housing in a manner to face the annular seal member, the annular slinger having a given portion that slidably contacts with a given portion of the rotating unit.

In accordance with a second aspect of the present invention, there is provided a water pump which comprises a rotating unit including a pulley, a drive shaft and an impeller which rotate as a single unit; a housing covering the drive shaft and having a pump chamber for receiving therein the impeller; a mechanical seal unit installed between the housing and the drive shaft to seal the pump chamber; a bearing including an outer race fixed to one of the rotating unit and the housing, an inner race fixed to the other one of the rotating unit and the housing and a plurality of rotating bodies operatively disposed between the outer and inner races; and an annular slinger arranged in a passage extending between the bearing and the mechanical seal unit, the annular slinger being fixed to the housing and having a given portion that slidably contacts to a rotating member fixed to the rotating unit, the rotating member being either one of the outer and inner races of the bearing.

In accordance with third aspect of the present invention, there is provided a water pump which comprises a rotating member adapted to be rotated by an external driving source; a housing that forms at least a part of a pump chamber from which a cooling water is led to an internal combustion chamber for cooling the engine upon rotation of the rotating member; a mechanical seal unit installed between the housing and the rotating member to seal the pump chamber; a bearing operatively disposed between the rotating member and the housing at a position other than the pump chamber; and an annular slinger arranged at an axial end of the bearing and fixed to a fixed portion, the annular slinger having a given portion that slidably contacts to the rotating member.

BRIEF DESCRIPTION OF THE DRAWINGS

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Other objects and advantages of the present invention will become apparent from the following description when taken in conjunction of the accompanying drawings, in which:

FIG. 1 is an exploded view of a water pump of a first embodiment of the present invention;

FIG. 2 is a front view of the water pump of the first embodiment of the present invention;

FIG. 3 is a sectional view taken along the line A-A of FIG. 2;

FIG. 4 is an enlarged sectional view of an essential portion of the water pump of the first embodiment;

FIG. 5 is a sectional view of a slinger that is usable as a part of a watertight construction employed in the water pump of the first embodiment;

FIG. 6 is a view similar to FIG. 5, but showing another slinger that is also usable as a part of the watertight construction employed in the water pump of the first embodiment;

FIG. 7 is a view similar to FIG. 4, but showing an essential portion of a water pump of a second embodiment of the present invention;

FIG. 8 is a view similar to FIG. 4, but showing an essential portion of a water pump of a third embodiment of the present invention; and

FIG. 9 is a view similar to FIG. 4, but showing an essential portion of a water pump of a fourth embodiment of the present invention.

DETAILED DESCRIPTION

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OF THE INVENTION

In the following, water pumps of various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The water pumps to which the following explanation is directed are of a type that is used for pumping a cooling water that circulates in an engine cooling system of a motor vehicle powered by an internal combustion engine. More specifically, the water pump is of a type that is mounted on a side wall of an engine block and powered by a crankshaft of the engine for circulating cooling water through a water jacket formed in the engine block.

In the following description, various directional terms, such as right, left, upper, lower, rightward and the like are used for ease of explanation. It is however to be noted that such terms are to be understood with respect to only a drawing or drawings on which a corresponding part or portion is shown.

Referring to FIGS. 1, 2, 3 and 4, particularly FIGS. 1 and 3, there is shown a water pump 1A of a first embodiment of the present invention.

As is seen from FIG. 1, water pump 1A comprises a pump housing 2 that has at its left side a cylindrical portion 11 and at its right side a flange portion 2a integrated with a right end of the cylindrical portion 11. Pump housing 2 is a cast product of aluminum alloy and fixed to a side surface of an engine block (not shown) through flange portion 2a thereby to form a pump chamber P (or volute chamber, see FIG. 3) between pump housing 2 and the engine block.

As is best seen from FIG. 3, a drive shaft 3 is rotatably and coaxially installed in pump housing 2 through an after-mentioned mechanical seal unit 10. Drive shaft 3 has a left end (in FIG. 3) that is projected outward or leftward from pump housing 2. To the projected left end of the drive shaft 3, there is fixed a central hollow portion 4c of a pulley 4. Although not shown in the drawing, a drive belt is put on pulley 4 to transmit a turning force (or torque) to drive shaft 3 from a crankshaft of the engine.




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stats Patent Info
Application #
US 20120321489 A1
Publish Date
12/20/2012
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0


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Hitachi Automotive Systems, Ltd.


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Pumps   Motor Driven   Internal-combustion Engine  

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20121220|20120321489|water pump|A water pump is constructed to have a rotating member that is adapted to be rotated by an external driving source, a housing that forms a part of a pump chamber from which a cooling water is led to an internal combustion chamber for cooling the engine upon rotation of |Hitachi-Automotive-Systems-Ltd