Railway Truck Side Bearing with Compressible Elastomer Springs

Solution Overview

Problem

Existing side bearings for rail vehicles face instability issues, particularly with increased freight capacity, operating speeds, and stringent safety standards, which affect the control of roll, yaw, and overall stability.

Innovation Solution

A side bearing assembly featuring a base and cap moveably coupled with elastomer springs that include foam with air pockets, configured for volumetric compression to enhance load-carrying capacity and energy absorption, thereby stabilizing the rail vehicle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If known side bearings with compression springs or elastic elements are used, then the rail vehicle can provide basic roll damping and stability, but inherent instabilities occur that are more pronounced with increased freight capacity, operating speeds, and safety standards

Engineering Contradiction:

ImprovestabilityVSAvoidinherent instabilities

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The side bearing uses a composite structure combining a viscoelastic material (elastomer) with an air spring system. The viscoelastic material provides continuous roll damping while the air spring provides additional stiffness and load support, creating a composite system that overcomes the limitations of simple compression springs or elastic elements alone.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the physical parameters of the side bearing by introducing compressible air pockets within the elastomer structure. This modifies the stiffness and damping characteristics dynamically, allowing the bearing to adapt to varying load conditions and operating speeds, thereby improving reliability without introducing instabilities.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If traditional side bearings are used, then the structure is relatively simple, but they provide insufficient control of roll, yaw, and overall stability under increased freight capacity and operating speeds

Engineering Contradiction:

ImprovestructureVSAvoidcontrol of roll and yaw

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The side bearing uses a composite structure combining a viscoelastic material (elastomer) with an air spring system. The viscoelastic material provides continuous roll damping while the air spring provides additional stiffness and load support, creating a composite system that overcomes the limitations of simple compression springs or elastic elements alone.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The elastomer spring incorporates air pockets within its structure, creating a porous configuration that enables volumetric compression. This porous structure allows the material to compress in three dimensions, significantly increasing energy absorption capacity and roll control effectiveness while maintaining a relatively compact form factor.

Inventive Principle:

Principle #31Porous materials

3Quantity of substance

If compression springs or elastic elements are used in side bearings, then basic energy absorption is provided, but insufficient load-carrying capacity and energy absorption occur under increased freight capacity

Engineering Contradiction:

Improveload-carrying capacityVSAvoidenergy absorption

Core Design Contradiction:

Quantity of substanceVSLoss of energy

Solution Approach 1:

The elastomer spring incorporates air pockets within its structure, creating a porous configuration that enables volumetric compression. This porous structure allows the material to compress in three dimensions, significantly increasing energy absorption capacity and roll control effectiveness while maintaining a relatively compact form factor.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The side bearing incorporates an air spring system that uses compressed air to provide additional stiffness and load support. The pneumatic element works in conjunction with the viscoelastic material to increase overall load-carrying capacity and energy absorption, allowing the bearing to handle increased freight capacity and operating speeds effectively.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 side bearing assembly increases stability and control of roll and yaw by effectively dampening roll energy through increased load-carrying capacity and energy absorption, improving the rail vehicle's performance under various conditions.

Implementation Method 1

The one or more elastomer springs comprise a foam having air pockets that are configured be compressed

Methodology Applied

Scientific EffectVolumetric compression: Compression

Implementation Method 2

The side bearings also dampen rotational inertia of the truck assembly, thereby adding stability to the rail vehicle

Methodology Applied

Scientific EffectDamping: Damping

Implementation Method 3

one or more elastomer springs disposed between the base and the cap

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11613281B2Railway truck assembly having compressible side bearings

Publication Date: 2023.03.28 AMSTED RAIL CO INC

AI summary

A side bearing assembly for a truck assembly of a rail vehicle includes a base, a cap moveably coupled to the base, and one or more elastomer springs disposed between the base and the cap. The one or more elastomer springs include a foam having air pockets that are configured be compressed.