Why Do Mini Excavators Use a Curved Boom Design?

[MikePhua]

In this discussion, users analyze the common “curved boom” design found on many mini excavators, exploring its functions, advantages, and the design rationale behind it.
Main Points:

• Better Digging Angle and Depth
  The curved boom allows the excavator’s arm to achieve greater digging depth and an improved working range without increasing the overall machine length. This is especially beneficial for working in tight or confined spaces.
  
• Improved Maneuverability and Flexibility
  This design enables the excavator to operate more flexibly, allowing it to maneuver around obstacles and reach better angles during close-quarter operations. It is suitable for landscaping, municipal work, and construction sites.
  
• Avoiding Structural Interference
  The curved shape prevents interference between the boom and the cabin or the machine body, improving spatial utilization during operation.
  
• Enhanced Structural Strength
  Some users mentioned that through thoughtful structural design, the curved boom balances strength and weight distribution, thereby enhancing the durability and stability of the entire machine.
  
• Historical and Brand Differences
  Different manufacturers use various boom designs—some straight, some curved—depending on design philosophy and user requirements. Japanese brands like Komatsu and Kubota commonly adopt the curved boom design.
  

Summary:
The curved boom design in mini excavators primarily aims to improve digging depth and working range while maintaining maneuverability and efficient spatial use. This design makes the machines more suitable for narrow work environments and avoids interference between the boom and the machine body. Different brands choose different boom styles based on user needs and design concepts, with curved booms being more common in Japanese mini excavators.