Integrated Track Adjustment Recoil Unit Assembly

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Solution Overview

Problem

Existing track type machines face challenges in assembly, packaging, and servicing of recoil systems, particularly due to cumbersome construction and potential misalignment issues in the line of force transmission through the idler, yoke, and recoil gas spring.

Innovation Solution

An integrated track adjustment/recoil unit is introduced, featuring an accumulator module with a gas plug and recoil stop within a hollow cylinder, where a recoil piston moves between stop surfaces, defining separate gas and oil volumes, and is biased by gas pressure to resist recoil forces, allowing for efficient track tension adjustment and recoil resistance without external fasteners.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If individual components of the recoil system are attached within the track roller frame housing, then the system can be assembled, but assembly becomes cumbersome and misalignment issues arise in the line of force transmission

Engineering Contradiction:
Improveassembly easeVSAvoidassembly complexity
Core Design Contradiction:
Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent combines the recoil system components (recoil shaft, yoke, gas spring mounting) and track adjustment components (adjusting mechanism, tensioning elements) into a single integrated preassembled unit. This merging of previously separate components into one modular assembly eliminates the need for complex individual attachment procedures within the track roller frame housing, directly resolving the assembly complexity issue while maintaining manufacturing capability.

Inventive Principle:
Principle #5Merging (Combining)

2Ease of manufacture

If a separate unit is preassembled and installed into the track roller frame, then assembly is simplified, but packaging and servicing challenges remain

Engineering Contradiction:
Improveassembly easeVSAvoidservicing ease
Core Design Contradiction:
Ease of manufactureVSEase of repair

Solution Approach 1:

The patent segments the recoil and track adjustment functions into a separate, self-contained preassembled unit that can be independently serviced. This modular segmentation allows the unit to be removed, repaired, or maintained without disassembling the entire track roller frame, directly addressing the servicing challenges while preserving the assembly simplicity benefits of preassembly.

Inventive Principle:
Principle #1Segmentation

3Strength

If multiple fasteners surround the recoil shaft to attach the yoke end, then the connection is secure, but the construction becomes more cumbersome and costly

Engineering Contradiction:
Improveconnection strengthVSAvoidconstruction complexity
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The patent merges the attachment functions into the integrated preassembled unit design, where the recoil shaft, yoke, and supporting structures are combined into a unified construction. This eliminates the need for multiple separate fasteners surrounding the recoil shaft, reducing construction complexity and part count while maintaining the structural strength and secure connection through the integrated design.

Inventive Principle:
Principle #5Merging (Combining)

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 integrated unit simplifies assembly and servicing, reduces weight and part count, and enhances performance by allowing for preassembly and easy access for tension adjustments, while maintaining effective recoil resistance and track tension management.

Implementation Method 1

The recoil piston is biased toward the first stop responsive to gas pressure in the gas volume

Methodology Applied
Scientific EffectGas compression: Compression

Implementation Method 2

a spring that is compressed when the idler and yoke are pushed into the track roller frame assembly. The spring then pushes back on the yoke and idler to recoil both toward their undisturbed operating configuration

Methodology Applied
Scientific EffectMechanical energy conversion: Spring

Data Source

PatentUS8870303B2Integrated track adjustment/recoil unit and track type machine using same
Publication Date: 2014.10.28 CATERPILLAR INC
  • US8870303B2 patent drawing
  • US8870303B2 patent drawing
  • US8870303B2 patent drawing

AI summary

An integrated track adjustment/recoil unit is compressed between a front track roller frame and rear track roller frame of telescopic track roller frame during a recoil event. The integrated track adjustment/recoil unit defines an oil volume separated from a gas volume by a recoil piston, which moves closer to the idler along a recoil line responsive to a recoil event.