Integrated Steerable Knuckle for Track Drive Stability
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Solution Overview
Problem
Existing steerable knuckle designs for machinery with track drives face challenges in providing structural support and efficient power transmission, often requiring external bearing supports and additional hardware, which can complicate the transition from wheel to track drives and affect stability on rough terrain.
Innovation Solution
A single, integrated steerable knuckle design that includes a hollow spindle, undercarriage support arms, king pin connections, steering cylinder connections, and tie rod connections, allowing for pivotable and rotatable components that support both power transmission and structural integrity, eliminating the need for external bearing supports and additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external bearing support is used to connect drive wheel to undercarriage, then structural support is provided, but device complexity increases due to extra bearing support and additional hardware
Solution Approach 1:
The knuckle integrates multiple functions into a single component: it provides structural support through integrated undercarriage support arms, accommodates bearing supports within its hollow spindle structure, enables steering through king pin connections, and transmits power through the driveshaft. This merging eliminates the need for separate external bearing support structures and reduces overall device complexity.
Solution Approach 2:
The knuckle serves multiple functions simultaneously: it acts as a structural support element, a steering mechanism, a power transmission component, and a mounting structure for bearing supports. This multi-functionality allows a single component to replace what would traditionally require multiple separate parts, reducing hardware requirements.
2Strength
If external bearing support is used, then weight support is provided, but quantity of parts increases due to extra hardware
Solution Approach 1:
The knuckle combines the functions of undercarriage support arms, bearing support mounting, steering mechanisms, and power transmission into a single integrated component. The hollow spindle structure internally accommodates bearing supports, eliminating the need for separate external mounting structures and reducing the total quantity of parts required.
3Power
If traditional steerable knuckle design is used for track drive, then power transmission is enabled, but stability deteriorates on rough terrain without external oscillation stops
Solution Approach 1:
The knuckle incorporates oscillation stop features that limit the pivoting range of the track undercarriage before excessive movement can occur. These built-in stops provide beforehand protection against instability on rough terrain, eliminating the need for separate external oscillation stop components.
4Power
If transition from wheel drive to track drive is made, then tractive efficiency is improved, but difficulty increases in getting structural support through knuckle
Solution Approach 1:
The knuckle merges structural support functions with power transmission and steering functions into a single integrated component. The hollow spindle structure provides internal pathways for driveshaft passage while maintaining structural integrity for undercarriage support, simplifying the transition from wheel drive to track drive systems.
Data Source
AI summary
A steerable knuckle, and an axle and track drive assembly including the knuckle, is disclosed. A driveshaft rotatable about a rotational axis extends through the knuckle and is coupled to a hub. The knuckle pivots about a steering axis generally perpendicular to the rotational axis. The track drive includes a drive wheel, a drive frame, rollers, and a track. Rotation of the driveshaft about the rotational axis rotates the hub and drive wheel which rotates the track about the drive wheel and rollers. Rotation of the knuckle about the steering axis turns the track drive. The knuckle can include a hollow spindle, one or more undercarriage support arm(s) for connecting the track drive frame, steering stops, and king pin, steering cylinder, and tie rod connections. The knuckle can be a single integrated piece. The undercarriage support arm(s) can include track frame mounts that can be generally horizontal or vertical.