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Vehicle drivetrain hydraulic coupling    
United States Patent5310388   
Link to this pagehttp://www.wikipatents.com/5310388.html
Inventor(s)Okcuoglu; Murat N. (Santa Barbara, CA); Shaffer; Theodore E. (Santa Barbara, CA)
AbstractA hydraulic coupling (32) includes a control valve (80) that controls pumping from a casing inlet port (58) by a hydraulic pump (48) through a casing outlet port (78) to control coupling between two rotary members. The casing (34) is connected to one of the rotary members while an impeller (50) having between five and seven external teeth is connected to the other rotary member and meshed with an internal ring gear (54) having one more tooth than the number of impeller teeth to provide sufficient pumping capacity so that the pump can act as a brake while still having relatively constant pumping pressure. The control valve (80) includes a bimetallic valve element (82) that compensates for temperature changes and may also include a speed sensitive valve closure (104) for providing immediate coupling without delay above certain speeds of operation. Mounting of the bimetallic valve element (82) of control valve (80) within a recess (98) provides accurate control of the temperature compensation.
   














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Drawing from US Patent 5310388
Vehicle drivetrain hydraulic coupling - US Patent 5310388 Drawing
Vehicle drivetrain hydraulic coupling
Inventor     Okcuoglu; Murat N. (Santa Barbara, CA); Shaffer; Theodore E. (Santa Barbara, CA)
Owner/Assignee     ASHA Corporation (Santa Barbara, CA)
Patent assignment
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Publication Date     May 10, 1994
Application Number     08/016,168
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     February 10, 1993
US Classification     475/88
Int'l Classification     F16H 001/44
Examiner     Wright; Dirk
Assistant Examiner    
Attorney/Law Firm     Brooks & Kushman
Address
Parent Case    
Priority Data    
USPTO Field of Search     475/84 475/86 475/87 475/88 475/89 475/90 475/91 475/93 475/99 475/100 475/101 475/103 475/108 475/109 475/116 475/127 475/174 475/175 475/231
Patent Tags     vehicle drivetrain hydraulic coupling
   
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Market Size
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$2B - $5B
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Market Share
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What is claimed is:

1. A hydraulic coupling for use with a vehicle drivetrain within a housing thereof containing hydraulic fluid to rotatively couple a pair of rotary members about a rotational axis, the hydraulic coupling comprising: a casing of a hollow construction that is rotatable within the housing about the rotational axis and connected to one of the rotary members; a hy