Follower Mechanism for Variable Gauge Brake Caliper Adaptation
Solution Overview
Problem
Existing brake caliper units for rail vehicles face challenges in adapting to different track gauges, leading to potential safety issues due to large transverse floating clearance and high transverse impact acceleration during high-speed operations, which can result in poor train operation safety.
Innovation Solution
A follow-up mechanism with a transverse displacement recognition device and a toothed locking and positioning device that automatically recognizes and adapts to gauge changes, ensuring the brake caliper unit moves with the wheel and locks at the target position, using internal elastic forces and a toothed locking mechanism to maintain stability and balance, and an automatic centering device to equalize brake pad and disc clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a floating brake caliper unit is used to adapt to gauge changes, then the brake caliper unit can move with the wheel during gauge transitions, but the large transverse floating clearance causes large impact acceleration during high-speed operation
Solution Approach 1:
The brake caliper unit employs a dynamic positioning mechanism that transitions from a fixed position to a movable position during gauge changes, then locks at the target position. The follow-up connector enables the brake caliper unit to dynamically adjust its position along the transverse direction, accommodating gauge variations while maintaining stability during operation.
Solution Approach 2:
A follow-up connector serves as an intermediary mechanism between the brake caliper unit and the wheel assembly. This connector includes a positioning mechanism with locking elements that mediate the transition between fixed and movable states, enabling controlled movement during gauge changes while preventing excessive floating during high-speed operation.
2Device complexity
If a fixed brake caliper unit is used, then the structure is simple and stable, but it cannot adapt to gauge changes
Solution Approach 1:
The brake caliper unit structure is segmented into a fixed portion and a movable portion connected by the follow-up connector. The positioning mechanism is further divided into unlocking members, locking elements, and fixing members that work independently but cooperatively. This segmentation allows the system to maintain structural simplicity while enabling gauge change adaptability through the movable segment.
Solution Approach 2:
The follow-up connector and positioning mechanism serve multiple functions: they enable gauge change adaptability by allowing transverse movement, maintain structural simplicity through a compact design, and ensure operational stability via automatic locking. The unlocking members and locking elements work together to provide both movement capability and position fixation without requiring complex separate systems.
3Adaptability or versatility
If the brake caliper unit has large transverse floating clearance to accommodate gauge changes, then gauge adaptability is improved, but transverse impact acceleration increases during high-speed operation
Solution Approach 1:
The positioning mechanism with locking elements provides preliminary anti-action by pre-establishing a locked state that prevents excessive transverse movement. During gauge changes, the unlocking members temporarily release the locking elements to allow controlled movement, then the locking elements re-engage to prevent large impact accelerations during high-speed operation, thus counteracting the potential harmful effects before they occur.
Solution Approach 2:
The follow-up connector incorporates a feedback mechanism where the locking elements detect the position of the brake caliper unit and automatically engage or disengage based on the gauge change requirements. This feedback control ensures that the transverse floating clearance is minimized during normal operation while allowing necessary movement during gauge transitions, thereby reducing transverse impact acceleration.
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 enhances train safety by allowing the brake caliper unit to withstand large impact loads, maintain balanced operation, and reduce eccentric wear, ensuring reliable and smooth operation across varying gauges.
Implementation Method 1
two displacement recognizing and balancing elastic members symmetrically mounted on the follow-up connector
Data Source
Figure 1~3
Figure 4~5a
Figure 5b~6a
AI summary
The present application relate to a follow-up mechanism and a brake caliper unit for gauge-changeable bogie, the follow-up mechanism includes a follow-up connector, unlocking members that are located on two sides of the follow-up connector and movably connected to the follow-up connector, a transverse displacement recognition device movably connected to the unlocking members, a toothed locking and positioning device mounted on the follow-up connector, and at least two mutually parallel fixation members; the follow-up connector is in sliding fit with the fixation members, and sliders are fixedly connected at ends of the unlocking members; the toothed locking and positioning device is movably connected to the transverse displacement recognition device and fixation members, respectively; the brake caliper unit comprises a mounting bracket, the follow-up mechanism, and a brake actuator mounted on the mounting bracket, the follow-up mechanism is installed in cooperation with the brake actuator, and the fixation members are fixedly mounted on the mounting bracket. The present application can automatically recognize the orbit change of a train, the follow-up mechanism moves with a wheel by means of its stored elastic force and the unlocking members, and can self-locked at the target gauge position, thus realizing the change in position.