Multipiece Wear Assembly Securement Mechanism
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Solution Overview
Problem
Existing multipiece wear assemblies for excavating equipment face issues with rapid wear, especially in abrasive conditions, and require cumbersome and dangerous manual processes for replacing worn parts, leading to inefficiencies and increased maintenance costs due to the need for specialized tools and compatibility challenges with different adapter styles.
Innovation Solution
A multipiece wear assembly design featuring a securement member that releasably maintains the adapter and wear part in operable combination without requiring hammers, using a lock system with a securement member that slidably inserts between the adapter nose portion and wear part, and a secondary lock to prevent inadvertent separation, allowing for easy replacement and compatibility with various adapter styles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pinning systems are used to interconnect the wear part and adapter, then the assembly can be held together, but the pinning systems can be harmed or destroyed by excessive loading in field applications resulting in inadvertent separation
Solution Approach 1:
The connection system is divided into multiple components: a lock that engages with the adapter nose portion, a securement member that fills the relief space, and a secondary lock that prevents inadvertent separation. This segmentation distributes the loading forces across multiple elements rather than concentrating them on a single pin, thereby improving overall connection reliability while reducing the strength requirements for individual components.
Solution Approach 2:
The relief space is designed to accommodate wear and dimensional variations before they lead to connection failure. The securement member fills this pre-designed relief space, providing a cushioning effect that absorbs excessive loading and prevents inadvertent separation of the tooth from the adapter nose portion.
2Ease of manufacture
If manual hammering processes are used to install retaining pins, then the wear part can be attached to the adapter, but the process is tedious, dangerous, and requires specialized tools
Solution Approach 1:
The lock and securement member system is designed to be self-installing without requiring external tools like hammers or punches. The components can be manually inserted and engaged directly, allowing field personnel to perform replacements without specialized tools, thereby reducing both the time required and the safety risks associated with manual hammering processes.
3Adaptability or versatility
If the adapter nose portion becomes worn from use, then clearances exist between the adapter and wear part, but this movement increases loads on conventional pinning systems
Solution Approach 1:
The relief space is pre-designed to accommodate the clearances that develop due to wear between the adapter nose portion and wear part. By providing this predetermined accommodation space, the system allows for wear tolerance while preventing excessive movements that would otherwise increase loads on the pinning system and lead to failure.
4Ease of operation
If the configuration of the blind cavity is larger than the adapter nose portion, then a relief space is created, but this relief space needs to be filled to prevent movement
Solution Approach 1:
The securement member acts as an intermediary element that fills the relief space created by the configuration difference between the blind cavity and adapter nose portion. This intermediary component prevents movement and maintains connection stability while allowing for the design flexibility provided by the relief space.
Data Source
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AI summary
A multipiece wear assembly including an adapter and a wear part. The adapter has a nose portion with a first predetermined configuration. The wear part is assembled onto the adapter nose portion by relative longitudinal movement and defines a blind cavity opening to a rear thereof. The blind cavity of the wear part has a second predetermined configuration. The second predetermined configuration defined by the blind cavity is greater than the first predetermined configuration defined by the adapter nose portion such that a relief is provided between the adapter nose portion and the blind cavity when the adapter and wear part are arranged in operable combination relative to each other. Lock structure is provided on the adapter nose portion for maintaining the wear part and adapter nose portion in operable combination. In one form, a modular securement member extends generally perpendicular to a longitudinal axis of the tooth assembly with a portion of the securement member filling the relief defined between confronting surfaces on the blind cavity and the adapter nose portion.