A - Frame and Suspension Fundamentals Flashcards
List three functions of a vehicle frame.
Provide a platform on which the major vehicle components are attached, support the load that the vehicle is intended to carry, and resist shock and torsional loads when the vehicle is in operation.
The point at which the maximum force is concentrated on a frame is called the:
Maximum bending moment.
A ladder type frame is made up of:
Parallel frame rails and cross members.
The function of frame cross members is to:
Provide strength and rigidity to the frame assembly.
Which of the following is Not a common frame rail shape: Trapezoid, channel, box, or I-beam.
Trapezoid.
The surface between the flanges of an I-beam frame rail is called the:
Web.
What is the function of a gusset that is attached to a frame cross member?
Gussets provide resistance to frame weaving.
True or False: The size and shape of frame components affect the strength of the frame.
True.
Define the term Yield Strength as it applies to the strength of frame materials.
Yield strength refers to the amount of stress that the material can withstand before becoming permanently deformed.
Which of the following materials would have the highest yield strength: Mild Steel; High strength, low alloy; High-treated alloy steel; or Copper-aluminum alloy.
Heat-treated alloy steel.
The term Section Modulus refers to the strength of frame components based on:
Height, width, thickness, and shape.
True or False: A frame with a high resisting moment (RBM) has less strength than a frame with a low RBM.
False; The greater the RBM, the greater the strength of the frame
List four function s of a vehicle suspension system.
Secure the axles to the frame while maintaining proper alignment. Support the weight of the vehicle and its cargo while maintaining lateral stability. Cushion shock loads. Allow axle movement so that the tires follow the contour of the road.
True or False: The term Unsprung Weight refers to the weight of the vehicle and its load.
False; The combined weight of the components below the connection point is called unsprung weight because it is located below the suspension system.
The suspension system must hold the axles in alignment with the frame. This means that the:
Wheels are held parallel to the frame rails.
Three of the most common types of energy-absorbing devices used in suspension systems are:
Leaf spring, rubber cushion, and rubber air spring.
True or False: The energy-absorbing device of a suspension system is released when it rebounds.
True.
Solid-mount suspension systems are best suited to applications that:
Operate on rugged terrain.
Equalizer beams reduce the effect of shock of loads to the vehicle frame by:
50%.
Axles are stabilized against braking and acceleration forces by:
Longitudinal torque rods.
The function of transverse torque rods is to:
Provide improved side-to-side stability by distributing side loads more evenly across the entire length of the axle.
True or False: Progressive leaf springs provide a low spring rate when the vehicle is unloaded and a high spring rate under load.
True.
Auxiliary springs help to support the vehicle when it is:
Loaded.
True or False: Spring shackles accommodate changes in spring length as the suspension jounces and rebounds.
True.
