BMW 5 Series: Body overview, Body structure
Body overview
G30 Side frame structure
- Multiphase steel (> 300 N/mm²)
- Ultra-high-strength steel (> 900 N/mm²)
- Aluminum
- Deep-drawing steel (< 300 N/mm²)
- Other steel grades
- Inner roof frame
- Roof frame reinforcement
- B-pillar reinforcement
- Side sill reinforcement plate
- Outer side frame (deep-drawing steel)
Body structure
The lightweight body construction concept of the G30 comprises high-strength steel and Aluminum components. There is no Carbon Core used in the construction of the G30 body like in the G12. The use of die-cast Aluminum components has increased significantly. Thanks to the material mix, the materials are able to contribute their specific strengths to the vehicle in the best possible way. As a result of the strict lightweight construction philosophy, the weight of the body has been reduced by around 46 kg / 101 lbs over the predecessor F10, but crash safety has been further improved.
Steel
G30 Ultra-high-strength steels in the body structure
- Carrier support, bulkhead
- Inner side frame
- Engine support extension
- Reinforcement plate, B-pillar
- Side sill reinforcement plate
- Outer connecting plate
Aluminum
The use of Aluminum extruded profiles and complex die-cast Aluminum parts accounts for a rigid body along with low weight. All requirements relating to passive safety are also met.
The spring strut domes on the front, and for the first time also on the rear, are manufactured using the Aluminum pressure die casting process. As is already familiar from the G12, the side members at the rear are now also made as die-cast Aluminum components. This contributes to excellent weight distribution in the body structure. New Aluminum cast alloys were also developed in order to increase the crash safety of these components.
G30 Aluminum in the body structure
- Front spring strut dome
- Rear spring strut dome
- Side member
- Engine support
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Screw connections
Some of the Aluminum-steel connections in the G30 body structure are produced
using a new body
joining technique: flow drill screws. These include, for example, the connection
between the engine
sup
Repair Level 1
Taking into account the repair stages of the BMW workshop information system,
the body repair work
in the Technical Qualification is divided into 3 repair levels. Each of the 3
Body Repair Levels in
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Horn
System wiring diagram
Horns
Horn, left
Horn, right
Relay in the Body Domain Controller
Body Domain Controller (BDC)
Steering column switch cluster (SZL)
Signal path of horn:
When the horn is pressed the signal is received by the steering column
switch cluster (SZL).
The SZL sends the in
Braking safely
General information
The vehicle is equipped with the Antilock Brake
System ABS as a standard feature.
Perform an emergency stop in situations that require
such.
Steering is still responsive. You can still avoid any
obstacles with a minimum of steering effort.
Pulsation of the brake pedal and soun
