Made (likely "Chinese Made") HR2470 Rotary Hammer Supplied Carbon Brush Holder 638500-6 – Compatible with HR2230, HR2460, HR2470
1. Product Identification
Item Type: Carbon brush holder (a component that houses and secures carbon brushes in the motor)
Part Number: 638500-6
Origin: Implied as "Chinese Made" (from context), supplied as a replacement part for HR2470 rotary hammers.
Primary Application: Designed for the HR2470 rotary hammer, with cross-compatibility for HR2230, HR2460, and HR2470 models.
2. Compatibility Details
Target Tools: Rotary hammers (heavy-duty drilling/breaking tools) including:
HR2230
HR2460
HR2470 (likely from a brand like Bosch, given common model numbering for such tools).
Function Match: Fits the motor assembly of these models, aligning with their carbon brush dimensions and commutator positions.
3. Core Role
Secures Carbon Brushes: Holds carbon brushes in place within the motor, ensuring they maintain consistent contact with the commutator during high-vibration operation (critical for rotary hammers’ drilling/breaking functions).
Conductivity Support: Provides a stable structural base for current transmission from brushes to the motor’s rotor, enabling the tool’s power output.
Spring Integration: Typically includes built-in springs to apply steady pressure (1.8–2.2kg) on brushes, compensating for wear and preventing sparking.
4. Key Features
Material: Heat-resistant, insulating plastic (e.g., glass fiber-reinforced nylon) to withstand motor heat (up to 120°C) and electrical insulation.
Design: Custom-fit to the motor housing of HR2230/HR2460/HR2470, with precise slots for brush insertion and alignment.
Durability: Engineered to resist vibration and impact from rotary hammer operation, reducing deformation or breakage.
5. Replacement Scenarios
When the holder is cracked, warped, or broken (compromising brush stability).
If the integrated spring loses tension (causing poor brush-commutator contact, leading to reduced power or sparking).
As a 配套 (matching) part when replacing carbon brushes in HR2230/HR2460/HR2470, ensuring optimal performance.
6. Importance in Tool Operation
Enables reliable current flow to the motor, directly affecting the rotary hammer’s drilling/breaking force.
Prevents uneven wear on brushes and commutator, extending the motor’s lifespan.
Ensures safe operation by reducing excessive sparking, which could cause overheating or damage.
