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

摘要

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.

主权项

1. A pressure control device for a rotary feedthrough of a vehicle tire inflating system having at least one tire that is inflatable with compressed air by way of the rotary feedthrough, the pressure control device comprising:
a ventilating inlet configured to receive compressed air with a ventilating inlet pressure; a ventilating outlet configured to inflate the at least one tire with a ventilating outlet pressure by way of the rotary feedthrough; a seal actuating outlet configured to activate at least one seal by compressed air with a seal actuating pressure for sealing an air chamber arranged between a stator and a rotor of the rotary feedthrough; a switchover valve that is pneumatically switchable by a switching pressure to ventilate the ventilating outlet with the ventilating outlet pressure only when the switching pressure is at least as high as a predefined minimum switching pressure; and a compressed air guide configured to build up both the switching pressure and the seal actuating pressure such that the build up of the switching pressure to the predefined minimum switching pressure is delayed with respect to the build-up of the seal actuating pressure to the predefined minimum switching pressure in order to ventilate the ventilating outlet in response to build-up of the ventilating inlet pressure at the ventilating inlet at least to the predefined minimum switching pressure.