Dual Steering Gear System Applied in Commercial Vehicles with Axle Forward and Axle Back Configuration Robert Bosch Direções Automotivas Ltda

Format:

Book

Conference/Event

Author/Creator:

Masunaga, Natália Sayuri, author.

Contributor:

Destro, Daniel

Moura, Márcio

Pedroso, Hugo

Santos, Antídio

Silva, Everton

Conference Name:

SAE Brasil 2025 Congress (2025-10-07 : Sao Paolo, Brazil)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

The hydraulic steering gear, in the ball and nut configuration, was introduced in series in 1985, commonly encompassing single circuits with only one hydraulic steering. In medium-sized commercial vehicles, the torque (force) required to turn the wheels through direct mechanical connection is approximately 400 Nm when the vehicle is stationary. By using hydraulic steering, the required torque is reduced to about 50 Nm. When the load of the front axle exceeds 6.7 tons, a dual steering gear system can be used, delivering 200% of the total force. Additionally, the dual steering gear system provides a better turning radius, eliminating the need for a steering assist cylinder, thus giving more space for the front wheels to turn. This article will describe the development of a dual gear for a dual steering gear for commercial vehicles. Schematic diagrams of a dual steering gear and how the system can deliver the required output torque for the steering process it will be shown. The system is designed to provide auxiliary output torque to the steering system without changing the gear ratio neither reducing the sensitivity of the steering wheel to the driver. The dual gear steering type should provide the system with greater torque assistance than the main steering due to better use of the pressurized area. In addition, the dual gear has 303 less components compared to the main gear leading to reduced manufacturing costs, as existing concepts from the ball-nut steering components can be utilized in the construction of the dual gear system. The results presented in this article indicate that during the dry-parking maneuver, 80% of the nominal pressure was achieved, yielding an output torque of 11700Nm at 170bar. In the figure-eight maneuver, 50% of the nominal pressure was attained. The system is deemed effective in delivering sufficient output torque to the steering system without compromising the sensitivity of the steering wheel to the driver or the number of steering wheel rotations

Notes:

Vendor supplied data

Publisher Number:

2025-36-0168

Access Restriction:

Restricted for use by site license