INDUSTRY COMPONENT

Circle

A circular component in motor graders that supports blade rotation and provides structural stability during grading operations.

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Component Specifications

Definition
The circle in a motor grader is a precisely machined circular component that serves as the mounting platform for the moldboard blade. It rotates on a vertical axis to adjust blade angle, enabling precise grading, sloping, and material distribution. This component transfers hydraulic power into controlled rotational movement while maintaining structural integrity under heavy loads.
Working Principle
The circle operates through a hydraulic motor-driven gear mechanism that engages with teeth on its circumference. Hydraulic pressure creates rotational torque, allowing the circle to turn the attached blade to desired angles (typically 0-90°). Precision bearings support the circle's rotation while maintaining alignment with the grader frame.
Materials
High-strength alloy steel (ASTM A572 Grade 50 or equivalent), heat-treated to 35-40 HRC hardness, with corrosion-resistant coating (zinc plating or powder coating).
Technical Parameters
  • Weight 150-300 kg
  • Diameter 1200-1800 mm
  • Thickness 25-40 mm
  • Gear Teeth 120-180 teeth
  • Load Capacity 15-30 tons
  • Rotation Speed 2-5 RPM
  • Operating Pressure 150-250 bar
Standards
ISO 8525, DIN 15061, SAE J1179

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Circle.

motor grader circle grading blade component construction machinery parts circle assembly grader rotation mechanism Circle Circle in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Motor Grader

A heavy-duty construction machine with a long blade used to create flat surfaces.

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Engineering Analysis

Risks & Mitigation
  • Gear tooth wear leading to imprecise blade positioning
  • Structural fatigue cracks from cyclic loading
  • Bearing failure causing rotation instability
  • Corrosion in harsh environments
FMEA Triads
Trigger: Inadequate lubrication
Failure: Increased friction and premature gear wear
Mitigation: Implement automated lubrication systems with pressure monitoring
Trigger: Overloading beyond design capacity
Failure: Structural deformation or cracking
Mitigation: Install load sensors with automatic operation limits
Trigger: Environmental contamination
Failure: Bearing seizure and rotation failure
Mitigation: Use sealed bearing assemblies with regular cleaning protocols

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5 mm diameter tolerance, ±0.1° angular positioning accuracy
Test Method
Dimensional verification with laser scanning, load testing at 150% rated capacity, rotational accuracy testing with theodolite measurement

Buyer Feedback

★★★★☆ 4.7 / 5.0 (32 reviews)

"Found 26+ suppliers for Circle on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Circle is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Circle so far."

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Frequently Asked Questions

What is the primary function of the circle in a motor grader?

The circle provides rotational movement to the moldboard blade, allowing operators to adjust cutting angles for precise grading operations.

How often should the circle be inspected?

Perform visual inspections every 250 operating hours and complete dimensional checks every 1000 hours to ensure gear tooth integrity and proper lubrication.

Can circles be repaired or must they be replaced?

Minor gear tooth damage can be repaired through welding and machining, but severe wear or structural cracks requires complete replacement.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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