SE450106B - DECKTRYCKSTYRVENTIL - Google Patents

Description

HO 450 106-9, which is connected by a line connection 10 to a supply line 11. The valve seat 9 and the valve element 8 are located in a tire pressure chamber 12, which is connected by a side connection 13 to a line leading to the tire. 1H.

A chamber 15 lying behind the diaphragm H and thus behind the piston member U / 7 constitutes a breathing chamber. In the chamber 15 there is a spring 16, which strives to press the valve element 8 against the valve seat 9. In the valve element 8 there is a non-return valve 17, through which the breathing chamber 15 can be connected to the supply line 11.

The valve element 8 is provided with a sealing insert, which is designed as a diaphragm plate 18, which is inserted into a recess 19 in the piston member U / 7. The recess has a flat surface 20, which at an axial opening 21 forms a seat for the non-return valve 17. The depth of the recess 19 corresponds approximately to the thickness of the diaphragm plate 18.

The diaphragm plate 18 has a horseshoe-shaped ring recess 22, whereby a valve tongue 23 is formed, which forms a closing element of the non-return valve 17.

Function The tire pressure control valve is normally closed. If the pressure in the tire is to be reduced or increased, a pressure increase from 0 to the desired new tire pressure first comes from the tire pressure control system via the supply line 11. When the increasing pressure rises above 100 kPa, the control valve opens. Any overpressure in the breathing chamber 15 is equalized by briefly opening the non-return valve 17. When the control valve is open, - depending on the required air supply or discharge - compressed air can flow to the tire or away from it through the control valve.

When the desired pressure is reached in the tire, the supply line 11 is suddenly vented. The piston means Ä / 7 breaks the connection between the tire pressure chamber 12 and the supply line 11. In this position of the piston means U / 7, the non-return valve 17 assumes a position in which it allows connection between the breathing chamber 15 and U1 450 1Û6 the vented supply line 11. In this way it is achieved that the breathing chamber 15 operates without a direct connection with the ambient air and that neither water, dirt or ice can enter the breathing chamber 15. This guarantees good function of the control valve even under difficult working conditions.

Claims (2)

1. \. "L 10 w_ 20 450 1-06 Patent claim 1. For a tire pressure regulating device in motor vehicles for changing the tire pressure while driving, the tire pressure control valve, which normally keeps a supply line connection closed but at a tire pressure change initiated by the driver, is opened by the controlled pressure , characterized in that the control valve (1) has a valve seat (9) fixed in its housing (5) and a valve element (8), which is carried by a piston member (H, 7), which separates a tire pressure chamber (12) from a breathing chamber (15), and that a non-return valve (17) is inserted in the valve element (8), through which the breathing chamber (15) can be connected to the supply line (11). Valve according to claim 1, characterized in that the valve element (8) has a diaphragm plate (18) with a horseshoe-shaped ring recess (22) and a valve tongue (23), which forms the valve element of the non-return valve (17). Valve according to claim 2, characterized in that the seat of the non-return valve (17) is formed by a flat surface (20) of the valve element (8), which is arranged on the bottom of a recess (19) in the valve element (8), and that the depth of the recess (19) largely corresponds to the thickness of the membrane plate (18).