REAR = Springs marked: HA, or (R), or Rear. >> stream If the scrub radius is small then the contact patch is spun in place when parking, which takes a lot more effort. 3 0 obj SAI is an imaginary line, that on strut suspensions runs through the lower ball joints and the upper end of the strut. The scrub radius of your car can be altered with different wheel offset and suspension design. /Filter [/FlateDecode /DCTDecode] I remember a long time ago with manual steering cranking the wheel to full lock while stopped. If the extrapolated KPI is outboard of the contact patch then the scrub radius is negative. Later model Porsches deal with this by moving the hub away from the lower strut mount thus giving more room for greater backspaced wheels without increasing positive scrub radius. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) x�3zU��=�����*֟�;���?���2E���E�O����ZW��s~��,�gr����'�2��d�����đ8A7Q�ˢ_O�+�9+�z� Vq� ��|�;��/�4d����< Y�@�#� ��=� %���� Scrub radius : 10% . The location of the steering gear linkage or rack can have a … ���'IJz�!�o?r�o+ stream The inclination of the KP axis in the side view is caster. Tel. 6��l�XV����h^�۝��o+���R�� ��� >> Braking in turn Steering effort : Scrub radius . /Filter [/FlateDecode /CCITTFaxDecode] /Mask 5 0 R /DecodeParms [null <>] This is actually desirable to help counteract Toe-in forces caused by positive caster. /Filter [/FlateDecode /CCITTFaxDecode] - posted in The Technical Forum Archive: Hi Chaps, can I ask a question please. 4% : Implementation of all the corrective actions, not only improved steering returnability by 40% but also helped in reducing the cycle time in design … I agree with most everything stated by the folks so far, but one thing that can easily overwhelm a "good" scrub radius setup is the steering system itself. This distance must be exactly the same from side to side or the vehicle will pull strongly at all speeds. /Width 160 Scrub radius is the distance at the road surface between the tire line and the steering axis inclination (SAI) line extended downward through the steering axis. We live & learn. Fig.5 Trackwidth Geometry Note: Generally narrow (small) trackwidth are used at rear to avoid hit cones with the back when they are endobj The location of the steering gear linkage or rack can have a profound effect on how the vehicle handles. While the scrub radius itself is an important aspect of the overall setup (steering), there's more to it than "just" the scrub radius. The road wheel actuator assembly defines a steering axis and the steering axis is off-set from a longitudinal axis of the wheel by a positive scrub radius. /Length 6805 It also reduces the risk, that a lose of traction on one front wheel during braking, causes the car to change direction. /Subtype /Image The system was made configurable also to function as a conventional power steering system, however preserving the normal torque characteristics, which then is analogous to 12 cm of scrub radius. Braking in turn Directional stability Scrub radius : 2% . 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. R ESEARCH ON MODELING AND OPTIMIZATION SIMULA TION ANAL YSIS … << I wonder if any one would have any thoughts on a problem I have. As with anything else, a little of a good thing is great, but lot of a good thing is not necessarily better. << /Width 160 /Height 76 /Type /XObject Advertisement. << The scrub radius induced understeer on AX radius corners was gawdawful. If it is inboard then the scrub radius is positive. !e�{�����������%���!����'}_@DTBB�+�(#� $. /Type /XObject ?� ~��Ia��zYb��|,� �����=g���(�(�^@L�S��A+���6�=m� ��L�`��x���Y�������W�=YMm��p���Ѷ�R�������)ϥ�|�B~�%R:���.�G�E�M=�\}�6"ʕ H��� @�Z��卹�#s2'7�"-�����θ�Ă�N?�{���%�s���ۋ�70�fa|R�>`�� This creates a small tire/road friction resistance that in turn translates into feedback from the road. Keeping scrub radius small will make the car easier to handle at low speeds. Scrub radius basically refers to the distance between the tyre centre line and the point at which the Kingpin axis meets the ground in the front view. ��.�HL����� to 0 cm of scrub radius in the blow-out case. The scrub radius of your car can be altered with different wheel offset and suspension design. The apparatus includes a back-drivable steer-by-wire system including a road wheel actuator assembly coupled to a wheel of the vehicle. ���r-���\��?�_P]Wf��)E��G�+� �j��� �c�P �wL�*� � << /Width 152 Different wheels or /Type /XObject n�o8,~�ʿ�~04�d����xW����38kVpc�Gi 祽�5���}2Z�8z�u�:嘤Lp�����^�/�!h�� scrub radius is produced when braking and steering is unstable. Page 1 of 2 - SCRUB RADIUS. �a-��oK"�䪻(�0�!�Q�#ދ�4^���g$�{��j&�ҡGnkM�)�%���lgU���6�ս�JX��i35w�&�>��N®�sH�w_e���EX�x�~y��=ż�Bg��:b� �A�ac���'�P����]\��~z��>�/�x���Ӎ�Վ����� endobj /Height 222 Fig 5 - scrub radius . With 0 scrub, as the Mk2 has, when turning the steering without moving causes the wheel to rotate on its own axis/contact patch. Its about changing the SAI/KPI to allow the wheel more inset over the hub so that the scrub radius is not excesive. What Is Scrub Radius? This will affect how the tire contact patch interacts with the road during cornering, braking, and acceleration, and can cause unique toe characteristics depending on the design. %PDF-1.4 ��5��`]��_���%B[��Cq �ϊ����f8�;}K's��+��� �b ��]C\�" ������׉��1� �bNY,���[�6�� e�rGZ�6��k��ѧޥ�i�����#�^����L�2��輇 |�X��.7�T�~3j^e� ?�^_�"DžA{���A�ө�jp��3�����T��)��T����[��*�82�3s���'��� ����JbJ��+����32N�ũ?YLN�'���$wO{5X�����ȟn����P8���QY���). /BitsPerComponent 8 A 5-6" scrub radius on these vehicles can lead to some pretty disconcerting drifts/pulls during hard braking and/or rough road conditions. /BitsPerComponent 1 8 inch wide wheels & a slightly narrower slick cured this. 7 0 obj %�CKG������w����������������c��F�&�f�v������}`�}���ޅGDFEǤ��OK����UPXT�����K����Ʀo�-=�}��C�ߧ�gf��~"��76�����=:>9=;�����" �Σ��䫰�q�� ��\�+���$���X��A�(o^i�$^���ozs��́�ɗ=ތz8�i���G�6 NK2���?��G�0����^��3o�0�{h�+] �혘��|ј� Design, Analysis and Optimization of Steering System, Studying the Effect of Caster Angle on Wheel Parameters by Dynamic Analysis Using ADAMS CAR Software, Design of a Suspension for a Formula Student Race Car. 6 0 obj Trackwidth The Distance between centre axis of tire from front view is known as trackwidth. Positive scrub radius works well with suspensions that use dual control arms that use less caster and SAI to optimize geometry. }k ��hVD䘤� Fig. The parameters obtained from this axis are described in an earlier post. 5 0 obj A positive scrub radius tends to be beneficial while braking into a turn. �������7��� 18 Time variation of steering assistance angle for different scrub radii 4.6 Simulation of Brake-in-turn Analysis to Study the Effect Scrub Radius In brake-in-turn analysis, the vehicle was made to run on the circular test track of 3.5 m radius with lateral acceleration of 0.35 g and then the brakes were applied. It could be positive, negative or zero. 5.Instantaneous center: Active Application number US09/892,722 Other versions US20020001076A1 (en Inventor David A. Jackson *���m���k���u��r ��a���1|1�~�|*�,P���dz�a�W$��y�� The parameters obtained from this axis are described in an earlier post. To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. You could watch the … /CreationDate (D:20121102074026-07'00') The main effect of this is to introduce a turning moment. /Subtype /Image : +33 (0)4 50 02 34 34 Fax: +33 (0)4 50 68 58 93 Website: www.exxotest.com 11 00312458-v1 MT-TWINGO 1.2.3. the two modes will behave the same during nor- Negative scrub also helps reduce torque steer in front wheel drive cars. You can download the paper by clicking the button above. Fig.4 - Kingpin inclination angle . Scrub radius basically refers to the distance between the tyre centre line and the point at which the Kingpin axis meets the ground in the front view. While included angle problems will affect the scrub radius, it is not the only thing that will affect it. stream 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. /Producer (PDF-XChange 4.0.181.0 \(Windows Seven Ultimate Professional Service Pack 1 \(Build 7601\)\)) /ColorSpace /DeviceGray d d d = 0 d Positive scrub radius Negative scrub radius . o�O���4hI�Y̆ЖB̒ܤ�nZ��ˮmVR�ZB��B[K^�?3"����㷼 ��A�yy��������I��oo����f��[¾U(�� �\G��7eK��r@]A��7�a�h�e3,��'���dsŮ��i݉8��������+�W��z����6}jii�YD�x3]�Nia���s���/�#ݒvT�z:_�������kk����#�{���啬W�� As far as I know, a scrub radius of 0 is the ideal (centre point steering), but sometimes quite hard to achieve. I.e. /BitsPerComponent 1 The scrub radius is the distance in front view between the king pin axis and the center of the contact patch of the wheel, where both would theoretically touch the road. Scrub Radius Scrub radius is the distance between where the SAI intersects the ground and the center of the tire. /Decode [1 0] In an embodiment of the present invention, an apparatus for steering a vehicle is disclosed. In 2008 USQ’s FSAE team was forced to abandon the competitiondue to a crash into a barrier which was thought to have been caused by the car’s suspension and steering system.

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