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.
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.
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:

The HB-DJ875 delivers:
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:
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.
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
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