FreshPatents.com Logo
stats FreshPatents Stats
1 views for this patent on FreshPatents.com
2012: 1 views
Updated: April 21 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

AdPromo(14K)

Follow us on Twitter
twitter icon@FreshPatents

Water pump

last patentdownload pdfdownload imgimage previewnext patent


20120321489 patent thumbnailZoom

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 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.

Browse recent Hitachi Automotive Systems, Ltd. patents - Hitachinaka-shi, JP
Inventors: Shingo MURAKAMI, Masahiko WATANABE, Hideaki NAKAMURA
USPTO Applicaton #: #20120321489 - Class: 417364 (USPTO) - 12/20/12 - Class 417 
Pumps > Motor Driven >Internal-combustion Engine

view organizer monitor keywords


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

last patentpdficondownload pdfimage previewnext patent

BACKGROUND 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

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

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.



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Water pump patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Water pump or other areas of interest.
###


Previous Patent Application:
Portable air compressor
Next Patent Application:
Convertible and compact refrigeration system
Industry Class:
Pumps
Thank you for viewing the Water pump patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 0.59143 seconds


Other interesting Freshpatents.com categories:
QUALCOMM , Monsanto , Yahoo , Corning , -g2-0.2367
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120321489 A1
Publish Date
12/20/2012
Document #
13469202
File Date
05/11/2012
USPTO Class
417364
Other USPTO Classes
International Class
/
Drawings
9



Follow us on Twitter
twitter icon@FreshPatents