Disc Brake Parking Ring Structure for Bell Deformation Resistance
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Solution Overview
Problem
Disc brake discs with metal sheet bells lack a reliable cylindrical surface for parking brake shoes, leading to deformation and inability to support high, localized parking braking actions due to their inherent irregularity and lack of structural support.
Innovation Solution
A disc brake disc design featuring a parking ring that transfers the parking force circumferentially to a metal sheet bell, which is connected to the wheel hub, allowing the parking torque to be effectively applied without deforming the bell, using a parking ring with a uniform connection to the bell and hub.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal sheet bell is used in a disc brake disc, then the disc becomes lighter and easier to produce, but the bell cannot support a parking brake cylindrical surface due to deformation under localized parking braking forces
Solution Approach 1:
The bell is segmented into two distinct parts: a metal sheet bell structure for the service brake function and a separate parking brake cylindrical surface (parking ring) for the parking brake function. This segmentation allows each part to be optimized for its specific function - the metal sheet bell remains lightweight and easy to produce, while the parking brake cylindrical surface provides the necessary structural support and reliability for parking braking forces without deforming under localized loads
Solution Approach 2:
The parking brake cylindrical surface acts as an intermediary element between the parking brake shoes and the metal sheet bell. It receives the localized parking braking forces from the shoes and distributes them uniformly to the bell through its connection portion, preventing direct application of concentrated loads to the metal sheet structure and thereby preventing deformation
2Weight of moving object
If a metal sheet bell is used, then weight is reduced and production is simplified, but the bell deforms into unwanted shapes under prolonged parking braking action
Solution Approach 1:
The bell is segmented into a lightweight metal sheet structure for the service brake and a separate parking brake cylindrical surface that handles parking brake loads. This segmentation allows the metal sheet bell to remain lightweight while the parking brake cylindrical surface provides the necessary structural stability to resist deformation under prolonged parking braking action
Solution Approach 2:
The parking brake cylindrical surface serves as a mediator that protects the metal sheet bell from direct exposure to concentrated parking brake forces. It distributes these forces uniformly across the bell structure, preventing the localized high stresses that would cause deformation while allowing the bell to maintain its lightweight metal sheet construction
3Ease of manufacture
If the bell is made in metal sheet to be connected to the hub and braking band, then production is simplified, but the bell lacks the capability to support high and localized parking braking forces
Solution Approach 1:
The bell is segmented into a metal sheet structure for ease of production and a separate parking brake cylindrical surface for strength. The parking brake cylindrical surface is specifically designed with the necessary thickness and material properties to support high and localized parking braking forces, while the metal sheet bell maintains production simplicity and lightweight characteristics
Solution Approach 2:
The parking brake cylindrical surface acts as an intermediary load-bearing element that receives the high and localized parking braking forces from the shoes and distributes them uniformly to the metal sheet bell. This intermediary structure protects the easily manufactured metal sheet bell from direct exposure to forces it cannot support, while still enabling the use of simplified metal sheet construction
Data Source
AI summary
A disc brake disc with a parking brake cylindrical surface for cooperating with shoes of a parking brake comprises a braking band comprising opposite braking surfaces and a geometric connection portion of band connecting the braking band to a bell; the bell comprising a connection plate with a wheel hub and an annular geometric connection portion of bell for geometric connection of the bell to the geometric connection portion of band; the braking band and the bell being pieces separate from each other and geometrically coupled to each other by geometric connection portions of band and bell so as to transfer a braking action by a brake caliper on the opposite braking surfaces from the braking band to the bell and to the wheel hub; the bell comprising a geometric bell connection surface opposite to said braking band. The disc brake disc further comprises a parking ring comprising radially and internally an inner portion of ring, and radially and externally a geometric ring connection portion.