Differential Parking Brake System for Motorized Vehicle
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Solution Overview
Problem
Existing parking brake systems for motorized vehicles require multiple integral parts, including separate brakes for each wheel, which can be complex and prone to instability over time, especially when parked on inclined surfaces.
Innovation Solution
A differential-based parking brake system that integrates a brake element within the transmission housing, allowing for the locking of transmission output shafts via frictional engagement, reducing the need for separate wheel brakes and providing a redundant braking mechanism for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate brakes are provided for each wheel, then reliable parking braking is achieved, but device complexity increases
Solution Approach 1:
The patent merges the parking brake function into a single centralized mechanism located in the transmission housing, rather than having separate brakes at each wheel. This single brake mechanism acts on the transmission output shafts to provide parking braking for all wheels simultaneously, reducing the number of integral parts while maintaining reliability through the unified locking action on the drivetrain.
2Power
If multiple separate brake components are used, then adequate braking power is achieved, but manufacturing cost increases
Solution Approach 1:
The invention combines multiple brake functions into a single brake mechanism that acts on the transmission output shafts. This centralized approach reduces the total number of brake components needed, simplifying manufacturing while maintaining adequate braking power through the mechanical advantage of the transmission gear ratios and the direct action on the drivetrain.
Solution Approach 2:
The single brake mechanism in the transmission housing serves multiple functions: it provides parking braking for all wheels simultaneously, acts as a locking mechanism for the transmission, and can provide emergency braking. This multi-functionality reduces the overall number of brake components needed in the system.
3Ease of operation
If separate wheel brakes are used, then independent brake control is achieved, but stability on inclined surfaces deteriorates
Solution Approach 1:
The patent merges the braking action into a unified system that locks both transmission output shafts simultaneously through a single brake mechanism. This ensures that all wheels are locked together, preventing differential movement that could occur with separate wheel brakes, thereby enhancing stability on inclined surfaces through synchronized locking action.
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 solution effectively keeps a motorized vehicle stationary on inclined surfaces with fewer integral parts, ensuring stability and reliability by locking both transmission output shafts, and providing increased braking power through redundant mechanisms, suitable for both emergency and automated driving scenarios.
Implementation Method 1
allowing for the locking of transmission output shafts via frictional engagement
Data Source
AI summary
The present disclosure relates to a parking brake system for a motorized vehicle, which uses a differential. Furthermore, the present disclosure relates to a differential for an automotive drive, which can be used by such a parking brake. The differential comprises a transmission housing, a transmission input, two transmission output shafts, and a rotary transmission for distributing performance effective on the transmission output shafts at the transmission input, the rotary transmission comprising at least four transmission elements, of which two transmission elements are configured as a central gear, at least one transmission element as a rotary gear, and a transmission element as a rotary gear carrier, wherein the rotary gear carrier is coupled with the transmission input and one of the central gears each is coupled with one of the transmission output shafts.