Principle of roof cover structure[汽车维修知识]

Car roof covers are usually divided into two types: fixed roof covers and convertible roof covers. Fixed roof covers are a common form of car roof covers, which are large-scale covering parts with larger outline dimensions, and are part of the overall structure of the car body. It has strong rigidity and good safety,CarIt protects the occupants when it rolls over. The disadvantage is that it is fixed, has no ventilation, and cannot enjoy the sun and the fun of driving.
The convertible top cover is generally used on higher-grade cars or sports cars. Part or all of the top cover can be moved by electric and mechanical transmission to fully enjoy the sun and air and experience the fun of driving. The disadvantage is that the mechanism is complex, and the safety and tightness are poor. There are two types of convertible top cover, one is called "hard top", the movable top cover is made of light metal or resin material. The other is called "soft top" and the top cover is made of tarpaulin.
At present, new convertibles mostly use hard tops, such as the famous Peugeot 206CC sports car. Press the button to uncover the rear luggage compartment cover. The top cover automatically folds and moves backward with the swing of the pillar (car rear pillar), moves to the luggage compartment and lowers it into the luggage compartment, and then closes the luggage compartment. Cover, at this time the whole car becomes a convertible. The components of the hard-top convertible are quite precise in coordination, and the entire electronic control mechanism is relatively complicated. However, due to the use of hard materials, the sealing performance after the top cover of the car is restored is better. The soft-top convertible is composed of a tarp and a supporting frame, and an open car can be obtained by folding the tarp and the supporting frame backwards. Due to the soft texture of the tarp, the folding is relatively compact, and the whole mechanism is relatively simple, but the sealing and durability are poor.
The fixed top cover and the convertible top cover have their own advantages and disadvantages. Can the disadvantages be removed while retaining the advantages of both? The designer came up with a compromise method, opening a window on the fixed top cover, that is, "Skylight"It can not only maintain the advantages of a fixed roof, but also obtain a convertible effect to a certain extent. Both can also increase the light in the cabin. This method is welcomed by car consumers. After the 1980s, the sunroof was opened. The car quickly became popular.
Generally speaking, skylights are mainly composed of glass windows, sealing rubber strips and driving mechanisms. The opening forms are generally divided into outer slide type, inner slide type and inclined type. The outer slide-type glass window slides on the top cover; the inner slide-type glass window slides between the top cover and the interior lining of the roof; the front or rear end of the tilted glass window is tilted upward to open; currently it is mostly used The latter two forms.
The skateboard drive mechanism consists of a bracket guide rail, a drive motor, a reduction gear,Clutch, Cable strap, locationSensorAnd limitSwitchConstitute. The entire driving mechanism is installed in front of the roof, and the glass windows are driven by steel cables to move on the guide rails. When the drive mechanism is working, the limit switch can detect the state of the glass window being fully open, fully closed, and tilted upward. In order to prevent the motor from being blocked when the glass window moves, an overload protection clutch is also set.

1 bracket, 2 inner sun visor, 3 glass window, 4 drive motor, 5 control mechanism, 6 steel cable

The most important issue in the design of roof skylights is to prevent water leakage. The inner side of the sunroof should be provided with a water trough and a frame embedded with a sealing rubber strip, and the water leaking from the gap should flow out of the car through the water trough and drain pipe. The movable glass windows are generally brown in color, which can reflect sunlight, and there is a sun visor inside. After the sun visor is opened, the light can be injected into the carriage.

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