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Toyota Motor Corporation's L-series of HybridSynergyDrive (HSD) transmissions (not to be confused the 4 and 5 speed manual L-series Toyota transmissions) are hybrid gearboxes containing 2 electric motors, one for driving the wheels and one for controlling the ratio between the engine and the electric drive motor, as well as an optional 2 or 4 speed planetary transmission attached to the end of the HSD device.
Toyota L110 / L110f
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The L110 transmission is used in the Lexus GS450h 2006-2020 and the AWD Variant is used in the 2007-2016 LS600h / LS600hl. [1]
The L110f housing also includes an LF1A TORSEN LSD transfer. There are two motors contained inside the L110 transmission, MG2 which is connected to the final drive output, which is connected to the wheels and MG1 which is connected between MG2 and the internal combustion engine, to vary the connection between the engine and the wheels. Both MG1 and MG2 are 3 phase motors powered by an inverter connected to an Ni-MH battery back. For more information please see: Hybrid vehicle drivetrain.
The L110 contains a 2 speed Ravigneaux gear set for reducing the final ratio from the HSD to the wheels, the vehicle uses the first gear to get moving under purely electric power from MG2, before moving into second gear. If the ICE is on, then the transmission will switch to gear 2, therefore first gear is only used to get the car moving under electric power.
The L110 transmission utilises both a mechanical, engine driven oil pump and an electric oil pump for use when the ICE is off. The L110 utilises a "sequential shiftmatic system" simulating 8 different fixed gear ratios selectable by the driver.
Toyota L210
editThe L210 transmission is used in the Lexus RC300h / GS300h / IS300h and features an EV only mode where the car can run purely from electric power, similar to the L110/f. The L210 has a maximum power output of 105kW/143ps with a peak torque of 300Nm.
The L210 optionally came with a 6-step sequential gear change function selectable by paddles on the steering wheel. [1]
The IS300h pairs the L210 with a 650V / 192cell NiMH battery pack. [2]
Toyota L310 / L310f
editThe L310 transmission is used in the LC500h and LS500h and Crown Hybrid paired with the 8GR-FXS engine. The L310f AWD variant is used in the AWD LS500h. The L310/f is paired with Li-ion batteries in the LC/LS.
It combines a hybrid power split device with a 4-speed planetary gearset and comes with 10 pre-programmed shifts to simulate a tiptronic transmission. [3]
Simulated Ratios [3]:
- First Gear: 4.701:1
- Second Gear: 3.5:1
- Third Gear: 2.801:1
- Fourth Gear: 2.241:1
- Fifth Gear: 1.793:1
- Sixth Gear: 1.436:1
- Seventh Gear: 1.197:1
- Eight Gear: 0.998:1
- Ninth Gear: 0.767:1
- Tenth Gear: 0.58:1
References
edit- ^ a b Clifford, Joe (2016-03-11). "History of Lexus transmissions". Lexus UK Magazine. Retrieved 2022-08-26.
- ^ "Login - Automotive Information Platform MarkLines". www.marklines.com. Retrieved 2022-08-26.
- ^ a b "Lexus Tech: Inside the Multi-Stage Hybrid System". Lexus Enthusiast Community Forums. Retrieved 2022-08-26.