Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Volker Ruehr

Axel Kamprath

Ulrich Schempp

A rim for a motor vehicle wheel with several through-openings which are arranged on a concentric aperture circle of the wheel circumferentially with respect to a wheel brake and which form air inlet and outlets. The openings are constructed semi-circularly shaped and include an arcuately shaped outer boundary surface and an arcuately shaped inner boundary surface. The outer boundary surface is formed each by a section of the aperture circle and the further inner boundary surface adjoins this section. The arc of this boundary surface extends up to a concentric inner circle of the wheel which has a smaller radius.

Rim for a motor vehicle wheel

A pneumatically operated pressure switch for monitoring the air pressure in a tire is provided with a second switch in its housing capsule. The second switch is connected to an oscillating circuit. This second switch changes the oscillating circuit upon sensing a change in the gas pressure in the reference pressure chamber. This leads to an error indication to the driver, and thereby provides a self-monitoring pressure switch for monitoring the air pressure in a tire.

Pneumatic pressure switch for tire pressure monitor

An apparatus for the heat-insulated placement of an electronic emitter that is a component of a tire pressure control device for a motor vehicle. The emitter is attached to the axle of the motor vehicle by a housing which contains an insulating material to form a heat shield to protect the emitter. The presence of the heat shield allows the emitter to be located in close proximity to the caliper of a disc brake system of the motor vehicle, a location which would otherwise be unavailable due to high ambient temperatures.

Growing community of inventors

Leinfelden-Echterdingen, Germany

Volker Ruehr