Lexus Variable Gear Ratio Steering

REDUCTION MECHANISM This key part of the VGRS system allows the input and output shafts to turn at differing speeds, thereby varying the steering ratio (from 12.0:1 to 10.3:1 in the GS). It consists of four parts: the stator gear, the driven gear, the wave generator, and the flexible gear. I. STATOR GEAR A fixed steel ring with 102 internal gear teeth, attached to the VGRS housing. 2. DRIVEN GEAR A steel ring with 100 internal gear teeth, attached to the output shaft. 3. WAVE GENERATOR An oval-shaped brass cam driven by the electric motor. Internal ball bearings push against and distort theylexible gear during rotation. 4. FUSIBLE GEAR A metal ring with 100 external teeth, the flexible gear is partially meshed with both the stator gear and the driven gear. Their differing number of teeth yields the steering-ratio change when an integrated motor spins the wave generator. This, in turn, rotates the driven gear and the output shaft through the flexible gear. When the motor spins In the opposite direction of the steering input, the rotation of the output shaft is greater than the rotation from the wheel, yielding a quicker steering ratio. To slow the ratio, the motor spins in the same direction as the input from the wheel. INPUT SHAFT is attached to the steering wheel. LOCK MECHANISM In the event of a system malfunction, this component locks the Input shaft to the output shaft. STATOR COIL PERMANENT MAGNET MOTOR SHAFT MOTOR To work, lips needs an auxiliary source of torque, which comes from a small permanent-magnet electric motor. It gets its marching orders from the steering-control computer, which analyzes speed and steering angle. OUTPUT SHAFT conveys adjusted steering commands to,the pinion gear.
Mudar o raio de giro do volante de um carro dinamicamente tem muitas vantagens. Um volante que tem uma angulação curta (poucas voltas de trava a trava) dá maior poder de controle do veículo ao motorista. Já se a angulação é maior (mais voltas de trava a trava) favorece a estabilidade do carro em altas velocidades.

O sistema computadorizado da Lexus usa uma espécie de "caixa de câmbio" embutida na coluna de direção. O Variable Gear Ratio Steering (VGRS) usa um "gerador de ondas" e uma engrenagem flexível. A empresa diz que seu sistema é mais preciso que o de outras montadoras, como BMW e Audi. O VGRS é utilizado nos Lexus LS, LX e GS F Sport.

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