Bail Compensating Joint for Rail Vehicle Brakes
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Solution Overview
Problem
Current railway vehicle braking systems face issues with improper application of hand brakes, leading to unwanted movement of cars, and require manual operation which increases labor costs and is prone to errors, especially during emergency brake applications or fluid pressure loss.
Innovation Solution
A bail compensating joint with a threaded push rod and ratchet mechanism, along with a spring-biased lever arm mechanism for a manual parking brake release, allows for angular movement and efficient release of braking force, reducing operator error and labor costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual hand brake operation is used, then brake application can be achieved, but operator error and labor costs increase
Solution Approach 1:
The brake system automatically applies brakes when fluid pressure is lost or during emergency brake applications without requiring manual intervention. The spring-biased lever arm mechanism self-activates to engage the ratchet and apply braking force, eliminating operator error and labor requirements while maintaining reliable brake application.
Solution Approach 2:
The system monitors fluid pressure conditions and automatically responds by engaging the parking brake mechanism when pressure loss or emergency brake conditions are detected. This feedback-based automatic activation ensures reliable brake application without manual operation.
2Force
If rigid push rod connection is used, then mechanical force transmission is efficient, but angular movement and misalignment are restricted
Solution Approach 1:
The push rod connection is divided into modular components: a threaded push rod, a ratchet mechanism, and a helical joint with bearings. This segmentation allows the push rod to transmit mechanical force efficiently through the threaded connection while the helical joint provides independent angular movement capability, accommodating misalignment without compromising force transmission.
Solution Approach 2:
The helical joint with bearings acts as an intermediary element between the push rod and the brake mechanism. It mediates between the rigid force transmission requirement and the angular movement requirement by allowing controlled angular displacement while maintaining effective mechanical coupling.
3Extent of automation
If complex release mechanism is used, then automated release can be achieved, but device complexity increases
Solution Approach 1:
The release mechanism uses periodic pneumatic pressure application to automatically engage and disengage the brake. When fluid pressure is restored, it periodically actuates the lever arm to release the ratchet and disengage the brake, achieving automated operation through simple periodic pressure cycles rather than complex continuous control systems.
Solution Approach 2:
Instead of using a complex mechanism to actively apply and hold the brake, the system uses spring force to automatically apply the brake and requires only simple pneumatic pressure to release it. This inversion simplifies the release mechanism by making the default state (brake applied) easy to maintain and the release state easy to achieve through pressure restoration.
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 ensures reliable and efficient application and release of brakes, minimizing unwanted movement and operational costs by enabling precise control of brake forces and automating the release process.
Implementation Method 1
a helical joint comprising a pair of bearings mounted on the ratchet for facilitating rotation of the ratchet
Implementation Method 2
a helical joint comprising a pair of bearings mounted on the ratchet for facilitating rotation of the ratchet
Implementation Method 3
The annular outer member of the composite race member may be metal and the annular outer member of the composite race member may be rubber joined adhesively to the metal
Implementation Method 4
The annular inner race member of the composite race member may be metal and the annular outer member of the composite race member may be rubber joined adhesively to the metal
Data Source
AI summary
A bail compensating joint may include a threaded push rod, a ratchet in threaded connection with the push rod for rotational motion thereon, and a helical joint including a first bearing and a second bearing mounted on the ratchet for facilitating rotation of the ratchet. The second bearing is supported by an annular composite race member formed by a metal annular inner race member joined with a resiliently deformable annular outer member. In another embodiment of the bail compensating joint, a pair of spherical joints is disposed on opposite sides of the ratchet, the spherical joints supporting the respective first and second bearings.