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STEERING COLUMN AND SHAFT

STEERING COLUMN AND SHAFT

SM2334128

id061300245800



Purpose/Function

• The steering input force, generated when the driver operates the steering wheel, is transmitted to the steering gear.



Construction

• The steering column and shaft consists of the steering column with a built-in Electric Power Steering (EPS) mechanism and the intermediate shaft.
• As a result of impact absorbing mechanisms on the steering column and intermediate shaft, when a collision occurs, the steering shaft effectively absorbs the impact energy that would be transmitted to the driver, thereby reducing injury.
• Due to the adoption of a tilt/telescope mechanism for the steering shaft on all vehicles, operability has been improved.


Structural View
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Operation


EPS mechanism

• Based on the signals from the torque sensor, the vehicle speed signal input from the DSC HU/CM, and the engine rotation speed signal input from the PCM, the EPS control module (CM) drives the EPS motor and transmits the assist torque to the intermediate shaft via the deceleration mechanism.


Energy absorbing system

• At the moment of a collision, when impact energy (first stage impact) is input from the vehicle front due to the rearward collapse of the steering gear, the intermediate shaft contracts to absorb the impact from the driver. (Section X in the figure)
• If the driver’s body contacts the steering wheel (second stage impact), the E/A plate slides along the fastening part (area A in figure) of the adjusting lever or the upper shaft slides into the press-fit part (area B in figure) of the E/A plate. As a result, the upper shaft contracts and absorbs the impact to the driver.
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Tilt/telescope mechanism

• The steering wheel can be moved in the up/down and forward/backward direction when the adjusting lever is pressed towards the front of the vehicle to release the lock of the tilt/telescope system.
• The tilt/telescope mechanism has a movement range of 45 mm {1.8 in} (tilt)/ 70 mm {2.8 in} (telescope) and can be adjusted, without steps, to anywhere in this range.
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