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Rotary transmission leadthrough of a tire pressure control unit

  • US 6,439,044 B1
  • Filed: 10/19/2000
  • Issued: 08/27/2002
  • Est. Priority Date: 10/19/1999
  • Status: Expired due to Term
First Claim
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1. A rotary transmission leadthrough of a tire pressure control unit for transmitting pressurized fluid from a stationary portion of a motor vehicle to a rotatably supported wheel in order to change pressurization of the wheel, said rotary transmission leadthrough comprising:

  • (a) a stator-side annular body mountable to a stationary portion of a motor vehicle and having a face portion, at least one chamber defined through said stator-side annular body so as to open at said face portion thereof and provide flow communication with a source of a pressurized fluid, and outer and inner annular grooves formed in said face portion in a concentric and radially spaced relationship with respect to one another such that said one chamber is disposed between and radially spaced from said outer and inner annular grooves;

    (b) a rotor-side annular body having a face portion and at least one chamber defined through said rotor-side annular body so as to open at said face portion thereof and provide flow communication with a filling valve associated with a wheel of the motor vehicle rotatable about a rotational axis, said rotor-side annular body being mountable to the wheel such that said annular bodies are disposed concentrically about and extend along the rotational axis of the wheel and are axially spaced apart from one another along the rotational axis so as to define an annular-shaped motion gap between said face portions;

    (c) outer and inner sealing ring members inserted into corresponding ones of said outer and inner grooves of said stator-side annular body and being moveable along the rotational axis of the wheel relative to corresponding ones of said outer and inner grooves; and

    (d) control means defined in said stator-side annular body in flow communication with said outer and inner grooves therein for transmitting a pressurized fluid from an external source to said outer and inner sealing ring members so as to selectively cause movement thereof toward and away from respective sealing contact with said facing portion of said rotor-side annular body that provides radially sealing by said outer and inner sealing ring members across said motion gap respectively outwardly and inwardly of said chambers of said annular bodies for providing flow communication between said chambers so as to transmit pressurized fluid from said one chamber of said stator-side annular body to said one chamber of said rotor-side annular body, as said rotor-side annular body rotates with the wheel relative to said stator-side annular body.

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