Pressure control device for a tire inflating system with a rotary feedthrough, and tire pressure changing method

US9555672B2 · kind B2 · utility

Assignee

• WABCO GmbH · DE

Inventors

• Dirk Bernhardt · Wunstorf, DE
• Thomas Dieckmann · Pattensen, DE
• Christian Wiehen · Burgwedel, DE
• Frank Zielke · Barsinghausen, DE

Key dates

• Filing date: Mar 15, 2012
• Grant date: Jan 31, 2017
• Expiry date: Jul 12, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/36
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A pressure control device for a vehicle tire inflating system is configured to receive compressed air via a ventilating inlet, activate at least one seal for sealing an air chamber between a stator and a rotor of a rotary feedthrough via a seal actuating outlet, and ventilate a tire at a ventilating outlet pressure via a ventilating outlet and the feedthrough. A control valve is pneumatically controllable by a control pressure, the ventilating outlet being ventilated at the outlet pressure by the control valve only when the control pressure is at least a defined minimum pressure. In response to pressure build-up at the ventilating inlet at least to the minimum pressure, the control pressure and the seal actuating pressure are built up for ventilating, but build-up of the control pressure is delayed with respect to the seal actuating pressure. Activation of a seal prior to ventilation of the ventilating outlet is possible without additional actuating channels.