Basic principles of an F1 steering mechanism

[anishhotpunk]

I am reading the forum,for a long time.
I am interested to know how the F1 car steering,

I means where is the steering rack?
How different it is ?
What are key mechcansim to operate , geometry of it ?

Regards,

ANISH

[scarbs]

F1 steering systems are basically similar to Road Cars or any other race car. The steering wheel's attached to the column, which operates a rack&pnion steering rack, the track rods transfer the motion to the wheel\upright. F1 cars use a hydraulically assisted rack, while the column has a joint in it
(see the images below for a schematic and detail of the system.

Schematic


Column


Rack


Rack & Pinion


steering joint

[anishhotpunk]

thanks dear ...!

It seems you have great knowledge about the f1 developments. Thanks for helping me out.

regards ,

anish

[anishhotpunk]

as shown in the pictures (1st one), people talk about the differnet aspects of steering in F1, like aniti-ackerman, ackerman. what is the use of this knd of geomtry, how teams make decide what to use or not to. speacially , do we have to consider the equation of suspension geomtry in implementing the steering mechcansin etc. please throw some light on these aspects.

[mep]

Maybe we should make an ackerman topic.

[anishhotpunk]

http://imageshack.us/f/42/vlcsnap2012061018h02m38.png/

what are these probes for...?

[vaibhav]

F1 steering systems are basically similar to Road Cars or any other race car. The steering wheel's attached to the column, which operates a rack&pnion steering rack, the track rods transfer the motion to the wheel\upright. F1 cars use a hydraulically assisted rack, while the column has a joint in it
(see the images below for a schematic and detail of the system.

Schematic
http://scarbsf1.files.wordpress.com/201 ... ematic.jpg

Column
http://scarbsf1.files.wordpress.com/201 ... column.jpg

Rack
http://scarbsf1.files.wordpress.com/201 ... t_rack.jpg

Rack & Pinion
http://scarbsf1.files.wordpress.com/201 ... pinion.jpg

steering joint
http://scarbsf1.files.wordpress.com/201 ... gjoint.jpg

So, can you tell me, how they are operating rack with hydraulic in this small design???
I mean what is the cut section or design of the F1 steering rack and pinion with a hydraulic system looks like???

[strad]

??? you confuse me. It works like any hydraulic system.

[godlameroso]

The hydraulic pump fills a chamber either end of the rack and pinion gears, as the chamber fills it pushes the gears in either direction.

[scarbs]

F1 power steering rack

http://imgur.com/gallery/QkOJcGH

The basic unassisted rack and pinion set remains the same. F1 racks must be mechanical and no electronic aids.

There is a hydraulic valve (left of centre - green), this uses some compliance between the pinion and rack, the small amount of movement shifts the valve and that directs hydraulic pressure into the actuator to help move the rack.
The compliance comes from the grey 'M' shaped spring, which positions the pinion against the rack. Ateams will tailor this to give the driver the feel they need.

[Greg Locock]

Fun fact. In a conventional hydraulic rack and pinion steering system both sides of the piston are at full pressure. One of them gets exhausted to give pressure differential across the piston.

Ackerman. There more than 3 theories on this. Theory one is that it is all too complicated and you should just use parallel steer. Theory 2 is that the the inner wheel should be oversteered to increase the yaw moment on entering a corner, by causing drag on the inner wheel. Theory 3 is that the outer wheel is more heavily laden and will reach its peak slip angle at a different steer angle than the inner, and so the steering should be set up to optimise both. Theory 4 is that static toe behaves much like Ackerman.

[Sebgamer]

F1 steering systems are basically similar to Road Cars or any other race car. The steering wheel's attached to the column, which operates a rack&pnion steering rack, the track rods transfer the motion to the wheel\upright. F1 cars use a hydraulically assisted rack, while the column has a joint in it
(see the images below for a schematic and detail of the system.

Schematic
http://scarbsf1.files.wordpress.com/201 ... ematic.jpg

Column
http://scarbsf1.files.wordpress.com/201 ... column.jpg

From the image it looks like a single universal joint on the column, which means the steering would be non-linear. Is this the case in F1? Or is a CV-joint used?

[Greg Locock]

Single UJ does give a non linear steering gain, but so long as (in the simple case) the cross is vertical and horizontal the non linearity is symmetrical about the straight ahead position.