Automobile power steering system knowledge and fault
diagnosisToday, Taizhou Dongna brings you some knowledge about the
steering system, and I hope it will be helpful to you.1.The role of
the steering systemThrough the driver's operation, change the
driving direction of the car.2.Second, the composition of the
steering systemThe steering system is mainly composed of three
parts: the steering control mechanism, the steering gear and the
steering transmission mechanism.Steering mechanism: The driver's
force on the steering wheel is transmitted to the steering rack and
power steering pump.Steering gear: properly transform the torque
and steering angle from the steering wheel (mainly deceleration and
torque increase), and then output it to the steering transmission
mechanism to make the car turn. So the steering rack is
essentially a reduction gear.Steering transmission mechanism: The
force output by the steering gear and power steering
pump is transmitted to the steering knuckles on both sides of
the steering bridge to deflect the steering wheels.3.Classification
of Steering SystemThe steering system configured on the car is
divided into mechanical steering system and power steering
system.The power steering system mainly includes the following
three categories1)Mechanical hydraulic power steering
system2)Electronic hydraulic power steering system3)Electric Power
Steering System4.Steering control mechanismIt refers to some parts
in front of the steering gear and power steering pump, which
is composed of steering wheel, steering transmission shaft,
steering column, steering cross and anti-injury steering
mechanism.5. Steering gearAs mentioned above, the function of the
steering gear and power steering pump is to transmit the
force from the steering wheel to the steering drive mechanism after
decelerating and increasing the torque, so as to achieve the
purpose of steering.There are many types of steering gears, such as
rack and pinion type, recirculating ball type, worm crank finger
type, etc.1)rack and pinion steering gearThis type of steering gear
is the simplest steering gear. Its advantages are simple and
compact structure, high rigidity, low cost, sensitive steering,
high positive and reverse attack rates, easy to arrange, and it is
especially suitable for matching with candle suspension and
MacPherson suspension, and can also be used directly Drive the tie
rod to simplify the steering transmission mechanism. Therefore, it
is widely used in cars, miniature and light trucks.2)recirculating
ball steering gearThe thread between the steering shaft and the nut
frame is replaced by many steel balls, and the steel balls roll in
the spiral groove to change the sliding friction into rolling
friction.When turning, turn the steering screw, and the force is
transmitted to the nut frame through the steel ball, and the nut
frame moves axially along the steering shaft. The nut frame then
drives the sector gear to rotate, thereby driving the steering rod
to move to achieve the purpose of steering.3)worm crank pin
steering rackThe worm has a trapezoidal thread, and the
finger-shaped tapered finger pin is supported on the crank with a
bearing, and the crank is integrated with the steering rocker
shaft. When turning, the worm is rotated by the steering wheel, and
the tapered finger pin embedded in the spiral groove of the worm
rotates on its own, while making a circular motion around the
steering rocker shaft, thereby driving the crank and the steering
drop arm to swing, and then through the steering transmission
mechanism to make the steering wheel deflection. This kind of
steering gear is usually used on trucks with high steering
force.4)hydraulic integral power steeringIn addition to the
electronic power assist, the current cars almost all use the
integral power steering gear of the rotary valve type.The steering
power cylinder piston is integrated with the mechanical steering
gear, and the piston divides the steering power cylinder into left
and right chambers. The steering control valve is installed at the
lower end of the steering column, and the steering shaft rotates to
control the working state of the steering control valve. The
steering control valve is a slide valve or a rotary valve.When not
turning, the control valve remains open, and the working chamber on
both sides of the power cylinder piston communicates with the
low-pressure oil return pipe and does not work. The oil output by
the impeller pump flows back to the oil storage tank through the
control valve.When turning, the driver turns the steering wheel to
drive the steering shaft and gears, so that the distribution valve
is in a working position corresponding to a certain turning
direction, and the corresponding working chamber in the steering
power cylinder is disconnected from the oil return pipeline, and is
connected to the output pipeline of the impeller pump. The other
cavity is still connected to the return oil pipeline.Product
descriptionwholesale p
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