SHANTUI SD22/KOMATSU D85 Forged Drive Sprocket Segment Assembly/P/N: 1542712273/1542712283/1542712293/made by DPW Parts
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Product Specifications
1. Functional Role and Operational Context
The Drive Sprocket Assembly is a mission-critical component within the track-type undercarriage system of a bulldozer. Its primary function is to serve as the final power transmission interface, converting the high-torque rotational output from the final drive into linear traction by engaging with the track chain links (specifically, the track bushings). This engagement propels the machine, enabling it to perform demanding tasks such as pushing, dozing, and excavating under extreme loads and in abrasive environments.
2. Component Breakdown and Design Rationale
The assembly is not a monolithic single-piece sprocket but a Segmented Sprocket. This design philosophy offers significant maintenance and economic advantages.
2.1. Sprocket Segments (Likely P/N: 1542712273, etc.): These are individual, arcuate, toothed components that, when bolted together, form the complete sprocket. Each segment features precisely machined teeth designed to mesh perfectly with the track chain pitch.
Tooth Profile: The teeth are engineered with a specific contour, flank angle, and root radius to optimize stress distribution, minimize point loading, and ensure smooth engagement and disengagement with the track bushing. This reduces impact forces and noise.
Hardened Wear Surfaces: The engaging surfaces of the teeth undergo specialized heat treatment to achieve extreme surface hardness (typically in the range of 55-65 HRC), providing exceptional resistance to abrasion from soil, rocks, and the track bushing itself.
2.2. Drive Sprocket Assembly (Complete Assy): This refers to the fully assembled unit, ready for installation onto the final drive hub. It may include the sprocket segments, high-strength alloy steel bolts, nuts, and potentially mounting hardware or a hub interface.
Advantages of the Segmented Design:
Serviceability: Worn sprocket segments can be replaced individually without removing the entire final drive or track frame, drastically reducing downtime and labor costs.
Cost-Effectiveness: Instead of replacing a complete one-piece sprocket, users can replace only the most severely worn segments, offering substantial savings in part replacement costs.
Inventory Efficiency: Dealers and workshops can stock individual segments rather than bulky, heavy complete assemblies, optimizing inventory management.
3. Material Science and Manufacturing Process
DPW Parts, as a reputable aftermarket manufacturer, employs rigorous material and production standards to ensure OEM-equivalent or superior performance.
Material Specification: The segments are typically forged from high-carbon or alloy steel (e.g., AISI 4140, 1045) to achieve a fine-grained microstructure with high strength and toughness.
Heat Treatment Process:
Through-Hardening: The entire segment is hardened to a core strength that can withstand the immense bending and shock loads.
Induction Hardening (or Flame Hardening): A subsequent process is applied specifically to the tooth flanks and root. This creates a deep, hard, wear-resistant case while maintaining a tough, shock-absorbent core. This dual-property characteristic is essential for longevity.
Precision Machining: Post-heat-treatment, the bolt holes and mounting surfaces are precision-machined (e.g., CNC drilling and boring) to ensure perfect alignment and concentricity when assembled, preventing premature bolt failure and uneven load distribution.
4. Compatibility and Interchangeability (SD22 / D85)
The designation "SD22/D85" is of paramount importance. It signifies direct interchangeability between:
Shantui SD22: A robust bulldozer model from Shantui Construction Machinery Co., Ltd.
Komatsu D85: The renowned Komatsu model upon which the Shantui SD22's design is historically based.
This cross-compatibility is a result of standardized undercarriage dimensions and specifications. It assures end-users that this DPW Parts assembly will fit and function correctly on both machine models, thereby broadening its application and market relevance.
5. Quality Assurance of DPW Parts
"Made By DPW Parts" represents an aftermarket solution characterized by:
Performance Parity: Engineered to meet or exceed the original equipment's dimensional, material, and performance specifications.
Value Proposition: Typically offered at a more competitive price point than OEM parts, providing an excellent balance of cost and durability.
Quality Control: Reputable aftermarket manufacturers like DPW implement stringent quality control protocols, including dimensional inspection, hardness testing, and non-destructive testing (e.g., Magnetic Particle Inspection) to detect surface defects.
