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Meet Pen-type Actuator HB-DJ 875: Redefining Reliable Actuation in Space-Constrained Applications


Release Time:

2025-12-30

Avoiding exposed motor housings and eliminating the need for complex mounting brackets, Hongba Mechatronics’ industrial-grade pen-type linear actuator HB-DJ875 integrates the motor, gearbox, and drive system coaxially into a highly compact unit—redefining reliable motion control where space is at a premium.


RV Pop-Up Roof: The Hidden Support Point Within the Ceiling

RV living embraces freedom while demanding smart space utilization. At the press of a button, the roof gently rises, expanding additional sleeping space. This motion is powered by the HB-DJ875 pencil-style actuator, seamlessly embedded within the roof frame structure. Such RV roof lift mechanisms pose three critical challenges for actuators: extreme spatial constraints, outdoor exposure, and fail-safe operation during power loss.
  • Compact Design: Low-profile cross-section of 65×64 mm fits within roof panel cavities without compromising interior headroom.
  • IP67 Protection + NSS 480h Salt Spray Resistance: Withstands rain, high-pressure car washes, and coastal saline environments.
  • Wide Operating Temperature Range (–40°C to +65°C): Maintains consistent performance—from arctic camping to desert expeditions.
  • Lead Screw Drive: Inherently provides 6,000 N self-locking capability, ensuring zero position drift during power outages and eliminating accidental roof collapse..
When internal space is pushed to its limits, conventional “L-shaped” actuators—with externally mounted motors and bulky linkages—often simply cannot fit.
In contrast, the HB-DJ875 integrates the motor, drive mechanism, and housing coaxially into a compact triangular prism form factor with a mere 65 mm × 64 mm cross-section, perfectly matching the limited vertical clearance inside RV roof structures.
  • IP67-rated sealing reliably handles water ingress from rain or high-pressure washing.
  • Operating temperature range of –40°C to +65°C guarantees dependable start/stop performance under alpine frost or desert sun.
  • Most critically, its lead screw self-locking mechanism mechanically secures the roof position during power failure, preventing unintended descent.

Shallow-Water Anchor Systems:

On small fishing boats, angling skiffs, or recreational yachts, traditional manual anchoring is labor-intensive and lacks precision in depth control. Modern intelligent shallow-water anchor systems use electric actuators to automate anchor chain deployment—enabling one-touch anchoring, auto-positioning, and rapid retrieval.
Such systems impose stringent requirements on actuators:

  • High corrosion resistance for continuous exposure to seawater and humidity;
  • High load capacity to overcome chain friction and hydrodynamic drag;
  • Fail-safe self-locking to prevent uncontrolled chain slippage and vessel drift;
  • Compact integration hidden within hull structures or gunwales without compromising navigation safety.
The HB-DJ875 delivers:
  • IP67 full sealing + stainless steel inner tube + Zn-Ni coated fasteners: Resists saltwater spray and corrosion, offering >10-year service life;
  • 65×64 mm footprint: Installs discreetly beneath aft decks or inside anchor winch enclosures—no external protrusions to snag lines;
  • 6,000 N mechanical self-locking force: Anchors remain securely locked even during sudden power loss, ensuring stable mooring;
  • 5,000 N dynamic thrust: Easily handles anchors and chains weighing over 100 kg;
  • –40°C to +65°C operating range: Suitable for global marine environments;
  • 12VDC or 24VDC input: Compatible with standard marine electrical systems for simplified wiring.

Modified Overland Campers & Awnings:

Off-road expedition vehicles often require electric actuation for tailgate opening or awning deployment—but rear compartments are narrow and must endure mud, vibration, and thermal extremes.

The HB-DJ875 meets these demands with industrial-grade durability:
  • 5,000 N peak dynamic thrust: Drives composite loads including awnings and fold-out tables (≥120 kg);
  • Standardized mounting interfaces: Front options F01/F02 and rear options R01/R02 (see Selection Manual Tables 6–7) enable rapid integration into vehicle frames—no custom brackets needed;
  • Lead screw self-locking: Mechanically holds position during power interruption, ensuring safety in remote settings;
  • Duty cycles of 20% or 35% available: Optimized for frequent cycling without overheating;
  • No exposed moving parts + IP67 sealing: Effectively blocks dust and mud ingress, reducing failure rates.
Installation length = Stroke + 344 mm, with stroke lengths from 25 mm to 1,200 mm (model-dependent), offering flexible adaptation across vehicle platforms.

Conclusion: The Engineering Philosophy of “Knowing What to Do—and What Not To”
The HB-DJ875 is a solution-focused product, not a universal actuator.
Its design philosophy emphasizes:
Strengths: Compactness, high ingress protection, wide temperature tolerance, mechanical self-locking safety, and standardized interfaces—making it the optimal choice for space-limited applications.
Limitations: No mechanical clutch (relies on electronic control), recommended stroke ≤1,000 mm, and high-speed applications require ball screw variants.
These intentional trade-offs ensure the HB-DJ875 excels as the best-fit solution—not the biggest—in its target niche.

Keywords:

875,Pen-type,Pen-type actuators,limited space,Motorhome ,equipment,linear actuator