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Driven Clutch Members
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Forward Right-Hand Turn Braking Condition
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 Fig.  37  Straight Forward Driving Straight Rearward Driving When  driving  a  vehicle  in  a  straight  rearward direction,  both  driven  clutch  members  are  held  in  full engagement    with    the    spider    and    center    cam    as described for straight forward driving.  However, in this case,   the   spider   rotates   in   the   reverse   direction   and shifts  the  driving  force  to  the  opposite  set  of  driving faces  on  the  mating  clutch  teeth.    Again  we  have  the assembly   operating   as   a   unit   with   each   wheel   being forced to rotate at ring gear speed. Right-Hand Turn Forward Direction When    making    a    turn,    differential    action    is required in order to permit the outside wheel to travel a greater distance, and faster, than the inside wheel. Fig.  38. Right-Hand Turn--Forward Direction A    conventional    bevel    gear    type    differential permits the outside wheel to turn faster than ring gear speed while the inside wheel turns slower than ring  gear  speed.   The  NoSPIN  differential  allows  either wheel  to  turn  faster  than  the  ring  gear  speed  but  does not permit either wheel to turn slower than the ring gear speed when power is applied. When negotiating a right-hand turn in a forward direction,  the  right-hand  driven  clutch  member  remains fully   engaged   with   the   spider   clutch   teeth   and   the corresponding cams, Fig.  38. The  driving  clutch  teeth  of  the  spider  transmit the driving force to the driven clutch member, which in turn  drives  the  right-hand  (inside)  wheel  constantly  at right  gear  speed,  thus  propelling  the  vehicle.    The  left- hand (outside) wheel covers a greater arc than the right- hand  (inside)  wheel  and  driven  by  the  traction  of  the road,  must  turn  faster  than  ring  gear  speed.    Likewise, the left-hand driven clutch member must turn faster than the   spider.      In   other   words,   it   permits   differences   in wheel  speeds  or  differential  action.  Fig.    39  illustrates how this is accomplished. Fig.  39. Forward Right-Hand Turn (Cross Sectional View) The right-hand row of cams on the center cam member are meshed securely with the cams on the right-hand driven clutch member. With the center cam thus locked in this position so that it cannot rotate with respect to the spider, its cams on the left-hand side serve as ramps upon which the mating cams on the lefthand driven clutch member can rise, enabling that driven clutch member to disengage from the spider. The ramps on the center cam are high enough to permit the clutch teeth on the driven clutch member to clear the teeth on the spider and when the crest of the ramp is passed, the teeth of the driven clutch member are forced back by spring pressure into full engagement with the clutch teeth of the spider. CTS-2095S - Chapter II - Page 4 PRINTED IN UNITED STATES OF AMERICA

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