Examkin

Question

Difficulty: MediumSuspension Systems

In a MacPherson strut front suspension assembly, which component is eliminated from the traditional double-wishbone design because the strut itself serves as the upper locating link?

  1. A
    Lower control arm
  2. Upper control armAnswer
  3. C
    Shock absorber
  4. D
    Steering knuckle

Answer

Upper control arm
A MacPherson strut incorporates the damper, spring, and upper pivot into one structural telescopic assembly attached directly to the body strut tower. Because this assembly handles the lateral and longitudinal forces at the top of the wheel assembly, the upper control arm and upper ball joint are not needed.

Step-by-Step Solution

1
Analyze the architecture of a traditional double-wishbone (short-and-long arm) suspension.
Identified that a double-wishbone system uses both an upper control arm and a lower control arm connected by ball joints to locate the steering knuckle.
Understanding the baseline multi-link architecture establishes which structural members guide the top and bottom of the wheel assembly.
2
Compare the double-wishbone layout to the MacPherson strut design.
The MacPherson strut combines the spring and damper into a rigid structural unit that bolts directly to the inner fender strut tower at the top.
This structural integration allows the top of the strut to serve as the upper locating pivot and support member.
3
Determine which component is made redundant by the structural strut.
The upper control arm and its associated upper ball joint are completely eliminated, simplifying the suspension and reducing packaging space.
The rigid strut replaces the mechanical locating role of the upper control arm.

Key Concept

MacPherson strut suspension architecture and component integration
Estimated Time:1m 0s
Rate this question

Topics

Suspension Systems

More questions from this topic