Toyota Camry Hybrid AHV40 Manual page 184

3) Reduction Mechanism
D The reduction mechanism consists of a high-precision rolled ball thread with a smooth surface, which
realizes high efficiency and low noise.
D The ball screw reduction gear has four ball directors, and is fixed to the rotor.
D By the ball director, the ball is circulated endlessly the inside of the ball screw reduction gear.
D The motor operates to rotate the rotor. Then, the rotational torque of the motor travels from the ball
screw reduction gear via the balls, thus transmitting a direct axial force to the rack shaft.
Ball Screw
Reduction Gear
4) Torque Sensor
a. General
The torque sensor consists of two resolvers, a torsion bar, main shaft (input shaft), and pinion shaft
(output shaft).
The two resolvers for the torque sensor are mounted to the main shaft (input shaft) and the pinion shaft
(output shaft) respectively, which are coupled with the torsion bar. This construction generates a relative
angle difference that is equivalent to the twisting of the torsion bar. When the driver turns the steering
wheel, this difference is created between the angle that the main shaft (input shaft) transmits to the
resolver 1 and the angle that the pinion shaft (output shaft) transmits to the resolver 2.
Torsion Bar
Resolver 1
(Input Side)
Resolver 2
(Output Side)
Pinion Shaft (Output Shaft)
CHASSIS - STEERING
Ball Director
Rotor
Main Shaft (Input Shaft)
Ball Screw
Ball Director
Reduction Gear
Ball
To EPS ECU
277CH139
CH-83
Rack Shaft
02HCH54Y