Linear guide without guide rail

A door system for a vehicle, the door system comprising:

• a door portal comprising a longitudinal profile formed from a first material for attachment to the door portal, which has a guiding track, which is U-shaped in cross section, with a bottom surface and two side walls extending at right angles therefrom,
• a door leaf, configured to be moved using a drive unit, from a closed position configured to close the door portal of the vehicle into an open position enabling entry of passengers through the door portal,
• a carrier guide connected to the door leaf and arranged in the upper area of the door portal for carrying the door leaf, having a slider, which at least partially reaches into the guiding track and is supported on rolling members in a linearly movable manner directly in the guiding track of the longitudinal profile,
• wherein
• opposing inner faces of the side walls each have at least one bearing member formed from a second material and disposed in the guiding track, on which the rolling members support the slider roll during a linear movement of the slider,
• two round bars extend parallel to each other in the longitudinal direction and are arranged as bearing members on both inner faces of the side walls, wherein the rolling members each roll on both round bars,
• the round bars are embedded in longitudinal grooves extending along a longitudinal axis of the longitudinal profile or the guiding track in the direction of movement of the slider,
• the two round bars are formed from a second material which is harder than the first material forming the longitudinal profile,
• the longitudinal profile and the slider form a guide, whereby the slider is configured to run directly along the longitudinal profile.