Drum Brake Lever Stiffening Structure for Offset Load Absorption
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Solution Overview
Problem
High offset angles in brake levers for drum brakes in heavy-duty vehicles induce significant lateral loads on the brake shaft and slack adjuster, leading to premature wear and damage.
Innovation Solution
Incorporation of a stiffening member within the brake lever design that absorbs lateral efforts, acting as a support leg to reduce stress on the brake shaft and slack adjuster, while maintaining the necessary offset for packaging constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the brake lever includes angled parts with high offset to overcome packaging constraints, then the packaging constraints are satisfied, but significant lateral loads are induced on the brake shaft causing wear and tear
Solution Approach 1:
The brake lever is segmented into a first portion and a second portion connected by a flexible connection, allowing the angled configuration for packaging while isolating lateral loads from the brake shaft
Solution Approach 2:
A flexible connection acts as an intermediary between the first and second portions of the brake lever, absorbing lateral loads and preventing them from being transmitted to the brake shaft while maintaining the necessary offset angle
2Volume of moving object
If the brake lever includes angled parts with high offset, then packaging constraints are satisfied, but damage to the slack adjuster is accelerated
Solution Approach 1:
The brake lever is divided into portions with a flexible connection between them, creating a structure that can accommodate offset angles while protecting the slack adjuster from lateral stresses
Solution Approach 2:
The flexible connection serves as a protective intermediary that absorbs lateral efforts before they reach the slack adjuster, thereby extending its operational life
Data Source
AI summary
The invention relates to a brake lever (20) for a drum brake arrangement (12), said brake lever being designed for transmitting the movement of a cylinder rod (14) to a brake shaft (22), wherein the brake lever (20) comprises a first portion (20a) delimiting a hole (24) for fitting the brake shaft (22) and a second portion (20b), which is configured to be pivotally connected to the cylinder rod (14) and wherein the first portion and the second portion are offset from each other with respect to a central axis (X24) of the hole (24). The brake lever further includes a stiffening member (28) that extends along a direction (L1) contained inside a plane (P1) perpendicular to the central axis (X24) of the hole and that includes an orifice (32) for fitting the brake shaft (22).