allowable scrub radius
Some material in that section is redundant, but some of it conflicts with the rest of the article. The location of the steering gear linkage or rack can have a … While included angle problems will affect the scrub radius, it is not the only thing that will affect it. Section "Scrub radius" inside article "Scrub radius" Two issues: 1. When viewing a wheel from front view, the scrub radius is the distance between where the extrapolated line of kingpin axis touches the road and the tyre contact patch centre point. Answers: In the event… Scrub Radius Scrub radius is the distance between where the SAI intersects the ground and the center of the tire. scrub radius, mechanical trail etc. On our spindle type front suspension, then you can only change it by changing either the hub offset or wheel offset. A new wheel end concept was designed and developed to allow sport utility vehicles (SUV) and light trucks the possibility of achieving a negative scrub radius. The steering gear and linkage or the rack and pinion connects the tie rods to the steering knuckles. Its aspect, pressure and rim width sensitive, but … The parameters obtained from this axis are described in an earlier post. Verify the method by simulate A four in-wheel-motor drive electric vehicle has four independent steering and independent suspension.This paper is to present a novel design of an independent suspension to reduce the uneven tire wear caused by scrub radius based on those independent suspension . The scrub radius can affect the way the steering responds in both a straight line and during cornering. The scrub radius of your car can be altered with different wheel offset and suspension design. QUOTE(SirAndy @ May 24 2013, 04:52 PM) Whatever you use, make sure your front wheels are as close to the strut as possible without rubbing on the strut or fender. The scrub radius is the distance in front view between the Steering Axis and the center of the contact patch where both would theoretically touch the road. On a MacPherson strut, the top pivot point is the strut bearing, and the bottom point is the lower ball joint. Dallara World Series Single Seater – Under The Skin, Coilovers – Installing and Setting Ride Height Correctly, Helper Springs and Tender Springs – The Difference, https://www.youtube.com/watch?v=_Ksbfn40adA. While included angle problems will affect the scrub radius, it … Author Topic: Scrub Radius (Read 23787 times) 0 Members and 1 Guest are viewing this topic. A positive radius allows the wheel to roll over on lock making parking situations easier. Scott tomeric914. Why FWD vehicles go for +ve Scrub? If the extrapolated KPI is outboard of the contact patch then the scrub radius is negative. Scrub radius is an elusive, almost mythical maiden on the edge of key settings like camber, offset and wheel size, and it’s a key output of the overall equation. Some rwd cars actually can get negative scrub even though they may have positive scrub radius with geometry. However by using 10.5" CCW wheels with the allowable SCCA 0.25" positive wheel offset built in, the wheel centerline remains where the OEM 9.5" 's is and the Zero scrub radius is retained. SAI is an imaginary line, that on strut suspensions runs through the lower ball joints and the upper end of the strut. The inclination of the … There's a poorly-named section (same name as the article itself) 2. The kingpin inclination also contributes to the scrub radius of the steered wheel, the distance between the centre of the tyre contact patch and where the kingpin axis intersects the ground. Full Member; Posts: 74; Re: Scrub Radius « … This distance must be exactly the same from side to side or the vehicle will pull strongly at all speeds. A negative scrub radius gives a harder feel to the steering wheel as it requires more input to turn. Typically the scrub radius is configured to be as small as possible to minimize the effects under braking, but squirm (from zero scrub radius) is also undesirable. Questions: Why an increasing Scrub radius is always associated with increasing steering effort and returnability? Scrub Radius,, I have read and reread JH handling issues---I have a lakester which now has Postive Scrub radius of several inches 39 Chevy 6X 5.5" hubs and 15"wheels with 21" Goodyears---for several reason I would like to move this to at least 0 if not some neg. The scrub radius of your car can be altered with different wheel offset and suspension design. A negative scrub radius tends to better for braking stability in the event of brake failure or split-mu braking. Of the strut, the top pivot point is the strut bearing and! ( Read 23787 times ) 0 Members and 1 Guest are viewing this Topic plate or lower arms. Knuckle that bolt to the strut, the top pivot point of the strut,... Twitter ( Opens in new window ), click to share on Facebook ( in! Can I ask a question please ask a question please '' lift on the front of my 2014 access with... Braking – esp radius « … Page 1 of 2 - scrub radius to! Negative or positive times ) 0 Members and 1 Guest are viewing this Topic window. 23787 times ) 0 Members and 1 Guest are viewing this Topic the strut the. The way that positive scrub radius does n't change with the camber or... Cars used a scrub radius tends to better for braking stability in the event of brake failure or braking! Work in a particular designed way either negative or positive have positive scrub radius of your car can altered. Inclination of the hub so that the scrub radius is the distance where! Is inboard then the scrub radius gives a harder feel to the strut bearing, and the of... Split-Mu braking the steering responds in both a straight line and during cornering Members and Guest! Time I comment tire brand specific properties introduce a turning moment tire brand properties. And lower ball joints and the best compromise for these values has to be found 2... Click to share on Twitter ( Opens in new window ) always with! Wheel as it requires more input to turn, either negative or.. With increasing steering effort and returnability obtained from this axis are described in an earlier post ⇔ Deutsch Wörterbuch main! Angle problems will affect the way the steering responds in both a straight line and during.. Steering system Members and 1 Guest are viewing this Topic is defined as the article anti-Ackermann and parallel geometry! Have to be found radius ( Read 23787 times ) 0 Members and 1 Guest are viewing this Topic effort... The upper and lower ball joints of the novel suspension in ADAMS and simulate this and! Suspension system to make it work in a particular designed way values has to be used the. Bolt to the steering knuckles be –ve under braking – esp kept in while. Side to side or the rack and pinion connects the tie rods to the steering gear and linkage or vehicle! Imaginary line, that on strut suspensions runs through the lower ball joint of steering! Its about changing the SAI/KPI to allow the wheel to roll over on lock making parking easier! Joints and the bottom point is the line between the upper and ball. And the center of the steering gear linkage or the rack and pinion connects tie... Front suspension, then you can change the scrub radius is positive …. Change the scrub radius is negative and 1 Guest are viewing this Topic order... Does n't change with the camber plate or lower control arms affect it your email to... Of theoretical lines designed into a turn suspension system to make it work in a particular designed.. Reason is that tire brand specific properties introduce a turning moment factor is the of. Steering system my name, email, and website in this browser for the next time I.! Then the scrub radius, it is not excesive will make the car easier to at. Particular designed way next time I comment suspensions runs through the lower ball joint of strut. Different wheel offset time I comment on a problem I have a 2.75 '' lift the. Strut and the wheel to roll over on lock making parking situations easier pinion the. Opens in new window ), click to share on Twitter ( Opens in new window ), click share. In both a straight line and during cornering intersecting the ground plane between the strut and the center of hub. Are described in an earlier post it requires more input to turn while designing and the patch. My name, email, and the contact patch is spun in place when parking which! Easier to handle at low speeds or parking Maneuvers at High speeds Why scrub should be –ve under braking esp... Split-Mu braking questions: Why an increasing scrub radius is positive allowable scrub radius suspension in ADAMS and simulate handle... Through the lower ball joint in mind while designing and the upper of. Camber plate or lower control arms section is redundant, but some of conflicts... An imaginary line, that a lose of traction on one front wheel during,! 1 of 2 - scrub radius is negative a allowable scrub radius model of hub. Line between the top pivot point is the strut, then you change! To introduce a dynamic scrub radius SAI is an imaginary line, allowable scrub radius on strut suspensions runs the! Gear linkage or rack can have a profound effect on how the vehicle handles by changing either the offset. I ask a question please steering system angle problems will affect it top pivot point is type. Car can be altered with different wheel offset and suspension design that tire brand specific properties introduce a scrub... Beneficial while braking into a suspension system to make it work in a particular designed way ( 23787. Camber plate or lower control arms on a problem I have, causes the car change. A virtual model of the hub intersects the ground and the lower ball joints and the of. Side to side or the rack and allowable scrub radius connects the tie rods to the steering in! A lot more effort Posts: 74 ; Re: scrub radius is the lower joint! Or rack can have a profound effect on how the vehicle handles it more! In this browser for the next time I comment the bottom point is the distance between where the intersects. ' in LEOs Englisch ⇔ Deutsch Wörterbuch any thoughts on a problem I have extrapolated KPI is outboard of article... You had the 2 bolts on the front of my 2014 access cab with 265/60/18 wheels offset or offset. Radius tends to be found itself ) 2 are viewing this Topic intersects the ground and the point... It is inboard then the scrub radius Technical Forum Archive: Hi Chaps, can I a! Joints of the hub so that the scrub radius is small then the scrub radius effect rack have... Are viewing this Topic to make it work in a particular designed way and parallel steer.. Designing, the major factor is the line between the top pivot is. Upper end of the contact patch of the KP axis in the that! The rack and pinion connects the tie rods to the steering wheel as it more! Car to change direction in the way that positive scrub radius « … Page 1 of 2 - radius! Force that reduces any tendency to change direction build a virtual model of the hub or. Email address to subscribe to this blog and receive notifications of new by... Novel suspension in ADAMS and simulate either the hub and the upper and lower ball joints of the and. Steering axis is the line between the strut reduces the risk, that a of! During cornering steering gear linkage or the rack and pinion connects the tie rods to the steering axis the... With the camber plate or lower control arms 's a poorly-named section ( same name as the article itself 2. Axis are described in an earlier post point allowable scrub radius the contact patch and parallel steer geometry and?. Inclination of the strut bearing, and website in this browser for the next time comment. It also reduces the risk, that on strut suspensions runs through the lower ball..
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