Automotive Component Cutaway Training Model

Guangdong Zhongcai Education Equipment Co.,Ltd. is one of the most reliable manufacturers and suppliers of automotive component cutaway training model in China. Welcome to buy high quality engineering education equipment from our factory. Also, OEM&ODM service is available.

Key Parameters
‌Linear-to-Angular Transmission Ratio‌: The distance the rack moves per full rotation of the steering gear input shaft (mm/rev). Calculated as i = πmn·z / cosγ, where mn is the pinion normal module, z is the number of pinion teeth, and γ is the rack inclination angle.
‌Rack Travel‌: Calculated based on the vehicle's target minimum turning diameter; influenced by the steering knuckle arm length-longer arms require greater rack travel but result in lower output force.
‌Rack Output Force‌: Typically set at ‌0.8–0.9 times‌ the maximum design load of the front axle.
‌Gear-Rack Center Distance‌: The spacing between the input shaft and the rack is usually controlled within ‌15–20 mm‌.
‌Mesh Backlash‌: Automatically eliminated via an adjustment screw and spring to ensure zero-backlash meshing.

Key Design Parameters for Gear and Rack
‌Gear Module‌: Typically between ‌2 and 3 mm‌.
‌Pinion Tooth Count‌: Usually ranges from ‌5 to 7 teeth‌.
‌Pressure Angle‌: Commonly ‌20°‌; for variable-ratio gears, it may range from 14.5° to 20°.
‌Gear Helix Angle‌: Typically ranges from ‌10° to 15°‌; helical gears are used to increase the contact ratio and reduce noise.
‌Rack Material‌: Commonly ‌AISI 1045 (45# steel) or 41Cr4‌; high-frequency quenched to achieve a surface hardness exceeding 56 HRC. The driving pinion is typically made of ‌20MnCr5‌ (case-hardened and quenched).
‌Housing Material‌: Usually die-cast ‌aluminum alloy or magnesium alloy‌ to reduce weight.

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