Conventional Powertrain, Powertrain Electrification Actuators

Gear Shift Actuators

Last update: 01 Sep. 2023

Electromechanical and hydraulic Gear Shift Actuators: what's the difference?

The EGS (Electro-Mechanical Gear Shift) or the HGS (Hydraulic Gear Shift) are actuators used in automatic transmission (Dual Clutch Transmission – DCT, Dedicated Hybrid Transmission – DHT, reducer) enabling Shift By Wire of the gears. The EGS (2 speed) is particularly designed to address 2-speed eDrive (P4 hybrid or BEV). Valeo offers both Electro-Mechanical & Hydraulic actuators to address all types of DHT, DCT and reducers.


What are Valeo Gear shift actuator benefits?

  • Design particularly adapted for electrified multiple speed transmission (Hybrids and BEV)
  • Lightweight design by using aluminium and high performance plastics

EGS module (electromechanical actuator)

  • Embedded electronics and diagnosis
  • CAN-bus communication to ECU
  • Shifting gears and park lock as an option
  • Anti-theft norm certified/capable UN ECE R116

HGS module (hydraulic actuator)

  • Fork integration available
  • Sensors for shift position and shaft speed integrated
  • Less shifting noise than typical electromechanical designs
  • Trouble-free operation even after long standing periods

Valeo Gear shift actuator specifications EGS module

  • Response time < 60 ms
  • Shift force up to 400 N
  • ASIL C compliant
  • Temperature range: from -40°C to 125°C

Valeo Gear shift actuator specifications HGS module

  • Operating pressure: up to 20 bars
  • Shifting speed: 200 mm/s
  • Shifting force: up to 1,500 N
  • Self-venting actuators

Vehicle type

  • Passenger car
  • Bus
  • Robot taxi
  • Motorcycle
  • Droid
  • Off road

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