ATASA 5 Th Suspension Systems ATASA 5 TH Study Guide Please Read the Summary Chapter 45 Pages: 13231362 Suspension Systems 98 Points Before We Begin…
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ATASA 5 th Suspension Systems ATASA 5 TH Study Guide Please Read The Summary Chapter 45 Pages: 13231362 Suspension Systems 98 Points Before We Begin… Keeping in mind the Career Cluster of Transportation , Distribution & Logistics Ask yourself: What careers might be present in this slide series? What careers might interest me? How do these careers relate to my other high school classes? What career cluster is my 4year plan preparing me for? ATASA 5 th Suspension Systems 1. Suspension systems support the ____________ of the vehicle, keep the __________ in contact with the road, maintain correct vehicle __________ _____________ & proper wheel _______________ and reduce the effects of shock forces as the vehicle travels on irregular surfaces. Chassis, Tires, Curb Height, Alignment ATASA 5 th Suspension Systems 2. Vehicles can have either body over _______ construction or be _________ construction. Frame, Plastibody Frame, Unibody Underbody, Framework ATASA 5 th Suspension Systems 3. Springs can be of either the _______, ___________ bar, ______, or air type. Coil, Unwound, Wound Coil, Torsion Bar, Leaf Coil, Torsion Joint, Leak ATASA 5 th Suspension Systems 4. The amount of spring deflection under a certain load is known as ____ ____. Spring Time Spring Jounce Spring Rate ATASA 5 th Suspension Systems 5. _________ is the term used to describe a spring compressing as a tire and wheel moves upward. Jounce Rebound Pounce ATASA 5 th Suspension Systems 6. ____________ is the term used to describe a spring extending as a tire and wheel moves downward. Jounce Rebound Pounce ATASA 5 th Suspension Systems 7. A ________ _______________ dampens or slows the spring motion during jounce & rebound. Control Arm Shock Absorber Sway Bar ATASA 5 th Suspension Systems ATASA 5 th Suspension Systems 8. All of the vehicle’s weight supported by the suspension is known as ______________ weight. The more sprung weight a vehicle has, the better it’s ride will be. (springs under shocks on struts) sprung weight: weight of the vehicle that loads the suspension. Sprung Weight Equal to the overall weight minus the unsprung weight. Unsprung Weight Gross Weight ATASA 5 th Suspension Systems 9. The vehicle’s weight not supported by the springs is known as_____ weight. Sprung Weight Unsprung Weight Gross Weight ATASA 5 th Suspension Systems 10. Coil springs can be either _____________ rate (same shape & same wire) or ________________ rate. Linear, Variable Fixed, Variable Taxable, Variable ATASA 5 th Suspension Systems 11. In variable rate springs, inactive, transitional, and active coils have the ability to ________ or bottom out within each other without touching, lessening the space needed to store the spring. Nest Best Rest ATASA 5 th Suspension Systems 12. Leaf springs may be either _____________ leaf, _____________, or __________ ____________. MultiLeaf, Monoleaf, Fiber Composite Single Leaf, Oak Leaf, Nylon Stacked Leaf, Monoleaf, Nylon ATASA 5 th Suspension Systems ATASA 5 th Suspension Systems 13. A ________________ pin is frequently used to ensure proper rear axle location on leaf springs. Centering or Aligning Offset Inset ATASA 5 th Suspension Systems 14. A ____________ secures the main leaf in a spring set to the frame allowing fore & aft movement. Spring Rubber Control Arm Shackle ATASA 5 th Suspension Systems 15. Some leaf springs are _____________ mounted. Transverse Inverse Reverse ATASA 5 th Suspension Systems 16. Fiber composite leafs made of _________________ and polyester resins weigh only 810 pounds. Nylon Fiberglass Carbon Fiber ATASA 5 th Suspension Systems Note: Fiber composite springs do not sag with age as all steel springs do. This maintains ride height. ATASA 5 th Suspension Systems 17. Air/electronic springs, located in the same places as coils, can provide a 1/3 _____________ ride. Harder Smoother More Controllable ATASA 5 th Suspension Systems ATASA 5 th Suspension Systems 18. Torsion bars, often described as straightened out coils, have one end anchored to the ___________ and the other end anchored to the lower control arm. Think of torsion as twisting along an axis. Unibody Frame Cradle ATASA 5 th Suspension Systems 19. Torsion bars are _________________ (right or left) because they are pre stressed for fatigue strength. They are also able to be adjusted to change ride height. Directional Interchangeable Transverse ATASA 5 th Suspension Systems Note: Torsion bars take up little space and they are adjustable to change chassis height. ATASA 5 th Suspension Systems 20. Shock absorbers are _________sensitive, __________dampening devices. http://www.adina.com/PROB06small.gif Velocity, Hydraulic Speed, Pneumatic Adjustment, Electric ATASA 5 th Suspension Systems 21. A shock absorber works on the principle of __________ displacement on both jounce & rebound. Air Electricity Fluid ATASA 5 th Suspension Systems 22. Angle mounting of shocks dampens both ________ & _________ torque. Decelerating & Stopping Accelerating & Braking Cornering & Straight Line ATASA 5 th Suspension Systems 23. Since aerated oil is compressible, it can cause a skip in shock operation. ______________ shocks have an internal nitrogen cell or bag to eliminate foaming and aeration of the shock oil. The nitrogen chamber in a gascharged shock may be pressurized to 25 times atmospheric psi. GasCharged AirCharged WaterCharged ATASA 5 th Suspension Systems ATASA 5 th Suspension Systems 24. Air shock systems can be either ______________ fill or automatic ________________________. Automatic, LoadCompensating Manual, LoadLeveling ECM, LoadSensing ATASA 5 th Suspension Systems 25. Some shock absorber jounce : rebound ratio or dampening rates are adjustable. True or False ATASA 5 th Suspension Systems 26. Most suspensions have a _______ bar to reduce body roll. They are also known as __________ bars or stabilizer bars. Used on both the front and rear suspension systems, the differ in diameter. Sway, Antisway Tracking, Sway Damper, Sway ATASA 5 th Suspension Systems 27. Stabilizer _____________ & sway bar __________ attach sway bars to the control arms & frame. Bushings, Links Shocks, Kinks Dampers, Rubbers ATASA 5 th Suspension Systems 28. ________ ______, are fastened from lower control arms to the frame limit forward & backward movement of lower control arms that don’t make use of the “A” shape. Strut Rods Strut Mounts Strut Pivots ATASA 5 th Suspension Systems 29. Suspension ____________ are used as rubbermounted pivots that absorb road shock as they twist. Dampers Limiters Bushings ATASA 5 th Suspension Systems 30. Use only __________ based lubricants on bushings, petroleumbased lubes will deteriorate them. Vasoline Silicone Water ATASA 5 th Suspension Systems Note: Many suspension components have rubber or polyurethane bushings to absorb road shock. ATASA 5 th Suspension Systems Note: As bushings go, the word compliance means “give” or movement in the soft component. ATASA 5 th Suspension Systems 31. MacPherson struts contain a ______, _______ suspension pivot or mount, & ______ absorber. Spring, Lower, Shock Spring, Upper, Shock Spring, Upper, Static ATASA 5 th Suspension Systems 32. _______ MacPherson suspensions have a coil spring mounted separately, not concentrically. Standard Hybrid Modified ATASA 5 th Suspension Systems 33. ____________ do the dampening function of a shock, locate the spring & the suspension position. Struts Shocks Bushings ATASA 5 th Suspension Systems 34. MacPherson strut suspensions eliminate the ___________ ball joint and upper ____________ arm. Upper, Control Lower, Control Upper, Tracking ATASA 5 th Suspension Systems 35. The upper strut __________ or bearing plate is the loadcarrying member of these suspensions. Mount Bushing Pivot ATASA 5 th Suspension Systems 37. On a modified MacPherson suspension, the lower ______ ________ is the load carrying member and the upper mount is the steering component. Tie Rod Ball Joint Steering Knuckle ATASA 5 th Suspension Systems In “doublewishbone style, the strut is not subjected to the side loads generated by braking, cornering, and accelerating. ATASA 5 th Suspension Systems In “doublewishbone style, the dampening is done by the strut & the stability is done by the control arms. Since duties are not shared, the strut can do its job & the control arms can do their job…”specialization” Increased Stability Better Ride Quality ATASA 5 th Suspension Systems 38. The ________________ arm, independent suspension systems maintain tiretoroad contact throughout jounce & rebound. They are often called SLA, Aframe, or doublewishbone suspensions. ShortLong ShortPerson ShortChange ATASA 5 th Suspension Systems 39. A narrow lower control arm is fitted with a __________ ______ to control fore & aft movement. Note: The upper strut mount is not a pivot in this system Strut Cartridge Strut Link Strut Rod ATASA 5 th Suspension Systems 40. The steering _____________ and wheel _____________ are often forged into a single component. Knuckle, Fist Knuckle, Spindle Knuckle, Arm ATASA 5 th Suspension Systems 41. Upper and lower __________ arms or Aframes have inner pivots to allow up & down movement. Control Tracking Ackerman ATASA 5 th Suspension Systems 42. A _______ ___________ connects the steering knuckle to the control arm, allowing the knuckle to pivot on the control arm during steering. Tie Rod Ball Joint Steering Damper ATASA 5 th Suspension Systems 43. Ball joints are either _________carrying or are _________________. The loadcarrying ball joint generally mounts on the control arm that holds the bottom of or “seats” the spring. Load, Followers Load, Leaders Load, Slackers ATASA 5 th Suspension Systems ATASA 5 th Suspension Systems To determine the loadcarrying ball joint, follow the load from the road through to the bottom of the spring & the frame ATASA 5 th Suspension Systems 44. Load carrying ball joints are also classified as either __________ or ______________ loaded, depending upon how the force of the load tends to either push on or pull on the joint to keep it in its socket. Follower ball joints are said to be frictionloaded.