Steering Gearbox
<Motor and Power Assist Mechanism >
A motor is housed inside the gearbox housing. It consists of a yoke with a permanent magnet fixed in it, a rotor with
a field coil, and brushes which pass electricity to rotor commutators. The motor is on the rack shaft of the steering gear-
box. The drive current from the power unit flows through the power relay and fail-safe relay to the brushes of the motor.
The drive current flows to rotor commutators through brushes, exciting the field coil of the rotor and rotates the rotor
with the magnetic action of the permanent magnet inside the yoke. The rotor rotates in the opposite direction when
the direction of drive current is reversed.
The rotation torque of the motor is transmitted to the ball screw throught the helical gear. The rotation torque on the
ball screw is converted into assist thrust in the direction of steering rack by the recirculating ball screw. The recirculating
ball screw acts to reduce the steering thrust put into the steering rack through the joint to lessen the steering force re-
quired at the steering wheel.
<Recirculating Ball Screw
The recirculating ball screw is constructed so that balls roll between the screw shaft and the nut, and those coming out
of the screw face enter the screw groove again through a tube for recirculation. The rotation torque on the shaft is con-
verted into thrust in axial direction as the slope of the screw shaft presses against the nut throught balls. Since the torque
conversion is made in this method through the screw shaft and balls, the friction is small, high transmission efficiency
is obtained for both the forward and backward directions, and the steering feels identicalto the ordinary manual steering.
Furthermore,
the force from the backward direction (force pressing the steering rack) is converted into the rota-
tion torque of the screw shaft, instantaneous kick-back from road surface will rapidly rotate the motor. In such a rapid
rotation, the inertia of the motor increases, which acts to reduce the kick-back. Any great kick-back will be transmitted
from the steering rack to the torque sensor on the pinion, which acts to twist the pinion shaft in the same direction as
the input direction of kick-back. As a result, the motor operates the kick-back to reduce assist force.
BALL SCREW
NUT
BALL
Содержание Acura NSX 1991
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Страница 22: ...Special Tools Individual tool lists are located at the front of each section ...
Страница 23: ...Specifications Standards and Service Limits 3 2 Design Specifications 3 l 1 ...
Страница 39: ...Body Specifications m I 1 175 46 3 Unit mm in ...
Страница 40: ...Maintenance Lubrication Points 4 2 Maintenance Schedule 4 4 ...
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Страница 193: ... PGM FI 1 IDLE CONTROL 1 FUEL SUPPLY 1 EMISSION CONTROL II 17 ...
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Страница 527: ...3 Assemble the transmission in the following numbered sequence Replace cont dl ...
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Страница 876: ...UPPER FRAME Rear Bumper Disassembly BUMPER BEAM UPPER LICENSE PLATE SUPPORT SUMP R SKIRT 20 50 ...
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Страница 1017: ...FLOOR WIRE HARNESS I Lx C 4 1 6 I C4b5 c 2 I LEFT KICK PANEL I I c422 C425 C424 C426 C423 I 0404 6701 kont d 23 31 ...
Страница 1019: ...C466 C465 C468 C464 c473 FLOOR WlFiE HARNESS co d 23 33 ...
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