Railway Brake Block Holder Vibration Damping
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Solution Overview
Problem
High-speed railway vibrations cause excessive clearance and risk of brake shoe separation in existing braking devices, leading to potential loss and necessitate frequent checks.
Innovation Solution
A vibration damping element, made of elastically deformable material like an elastomer or molded plastic, is interposed between the metal bridge and sole carrier housing to compensate for clearance and reduce vertical displacements, preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the brake shoe is connected to the sole carrier by a metal bridge with housing and trigger guard, then the structure is simple and easy to manufacture, but excessive clearance and vibrations occur at high speeds
Solution Approach 1:
A vibration damping element made of elastomer or molded plastic is introduced as an intermediary between the metal bridge and the sole carrier housing. This intermediary component absorbs vibrations and compensates for clearance while maintaining the simple metal-on-metal connection structure, thereby resolving the contradiction between ease of manufacture and reliability at high speeds
Solution Approach 2:
The vibration damping element is made of composite material (elastomer or molded plastic) that combines damping properties with structural support. This composite material approach allows the connection assembly to maintain simplicity while achieving vibration reduction and clearance compensation, resolving the contradiction between ease of manufacture and reliability
2Ease of manufacture
If metal-on-metal connection is used between bridge and housing, then manufacturing is simple, but vibrations increase and clearance becomes excessive at high speeds
Solution Approach 1:
The vibration damping element serves as a mediator between the metal bridge and housing, introducing a material that reduces vibrations without complicating the manufacturing process. The element can be easily molded or attached, maintaining ease of manufacture while eliminating the harmful vibration effect
Solution Approach 2:
The introduction of the vibration damping element changes the physical parameters of the connection interface by adding damping characteristics and compliance. This parameter change reduces vibrations and clearance while the element itself remains simple to manufacture, resolving the contradiction between ease of manufacture and vibration reduction
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 reduces vibrations and separation risks, ensuring reliable operation without modifying the standard brake shoe design, applicable to all railway and tramway braking devices with removable pads.
Implementation Method 1
a vibration damping element, of complementary shape to that inside the housing of the sole carrier and outer of the bridge of the sole, is interposed between said housing and bridge
Implementation Method 2
A vibration damping element, made of elastically deformable material like an elastomer or molded plastic, is interposed between the metal bridge and sole carrier housing to compensate for clearance and reduce vertical displacements
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The device (1) has a brake-block holder (2) connected to a railway rolling stock's e.g. train, chassis by an actuating system. Lateral emerging openings (8, 9) are matched with lateral emerging openings of the holder to facilitate lateral engagement of a locking cleat (10) during functioning. A U-shaped vibration damping element (11) has a shape complementary to an interior shape of a holder's housing (5) and an exterior shape of a metallic valve bridge (4). The element is interposed between the housing and the bridge and made of elastically deformable material e.g. plastic material/elastomer.