Brake Spindle Nut Soft Stop via Disc Spring
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Solution Overview
Problem
Conventional brake systems experience hard stops during parking brake release, leading to noise and reduced design life, and lack efficient mechanisms to absorb shock and increase durability while reducing costs.
Innovation Solution
Incorporation of a disc type spring between the spindle nut and spindle in the spindle/nut assembly, which provides a resilient force to prevent hard stops and facilitate soft stops, using various configurations such as Belleville, wave, or helical washers to absorb shock and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional brake system is used without a soft stop mechanism, then the structure is simple and cost-effective, but hard stops occur during parking brake release causing noise and reduced design life
Solution Approach 1:
A disc type spring is installed between the spindle nut and spindle in the spindle/nut assembly to provide beforehand cushioning. The spring absorbs shock and provides a soft stop during parking brake release, preventing hard stops and noise while extending design life without significantly complicating the overall brake system structure.
Solution Approach 2:
The disc type spring acts as an intermediary element between the spindle nut and spindle. This mediator component absorbs the impact and provides a gradual stopping mechanism, eliminating the direct hard contact that causes noise and reduces component life.
2Strength
If a disc type spring is added to provide soft stop, then shock is absorbed and durability increases, but the device complexity and cost increase
Solution Approach 1:
The disc type spring is pre-installed in the spindle/nut assembly to provide cushioning before the hard stop occurs. This beforehand cushioning protects the spindle and nut from impact damage, increasing durability while adding only one component to the assembly.
Solution Approach 2:
The disc type spring changes the mechanical parameter of the stopping action from a hard, abrupt stop to a soft, gradual stop by introducing elastic deformation. This parameter change absorbs shock and protects components without requiring complex assembly procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The disc type spring effectively reduces shock, increases the durability of the spindle/nut assembly, and decreases the overall cost of the brake system by preventing hard stops and enhancing the braking mechanism's performance.
Implementation Method 1
a disc type spring comprising a curved plate radially surrounding the spindle. The disc type spring may be disposed between the spindle nut and the spindle to provide a resilient force between the spindle nut and the spindle
Data Source
AI summary
A brake system comprises: a caliper housing having a bore formed therein; a brake piston slidably positioned in the bore of the caliper housing; and a spindle/nut assembly associated with the brake piston. The spindle/nut assembly comprises: a spindle; a spindle nut operably engaged with the spindle; and a disc type spring comprising a curved plate radially surrounding the spindle. The disc type spring is disposed between the spindle nut and the spindle to provide a resilient force between the spindle nut and the spindle. The disc type spring prevents the hard stop of the brake piston to the spindle/nut assembly and provide a soft stop. The disc type spring decreases a shock to the brake system, increases the durability of the spindle/nut assembly, and decrease the cost of the brake system.