Parking Brake Release Rod Offset Section Vibration Control

The release rod features an offset section with a specific geometric shape (including flat surfaces and ridges) localized at the position where the compression coil spring contacts it. This local structural modification allows the spring load to be distributed across multiple contact points (ridges and flat surfaces) rather than concentrated at a single point, thereby reducing vibration and noise while maintaining the simple circular cross-section of the majority of the rod. This approach ensures mechanical strength is preserved while avoiding complex shaping throughout the entire rod, thus controlling manufacturing costs.

The release rod employs a composite construction combining a metal rod material (providing mechanical strength) with a localized structural feature (offset section with flat surfaces and ridges) that optimizes vibration reduction. The metal material ensures sufficient strength for automotive applications, while the offset section geometry works synergistically with the compression coil spring to distribute loads and minimize vibration. This composite approach balances material properties and structural design to achieve both strength requirements and cost-effectiveness.

The vibration reduction function is extracted from the main body of the release rod and implemented through a localized offset section with specific geometric features (flat surfaces and ridges). Instead of shaping the entire middle section of the rod to contact the parking lever inner wall, the invention creates a discrete offset section that interfaces with the compression coil spring. This separation of functions allows the majority of the rod to maintain a simple circular cross-section for easy manufacturing, while the localized offset section provides the necessary vibration damping through its interaction with the spring.