Description
HCYY11112009 Aerial Work Platform Main Boom Telescopic Cylinder
The HCYY11112009 is a precision-engineered aerial work platform main boom telescopic cylinder designed to drive boom extension and retraction on telescopic boom lifts, extending the horizontal and vertical reach of the aerial platform to its maximum working position. The telescopic cylinder is installed inside the main boom extension mechanism and is the primary actuator that determines how far the operator can extend the boom to position the work platform at the required working location.
Telescopic boom cylinders operate in one of the most demanding installation conditions of any aerial platform cylinder. The cylinder is installed inside the boom tube, which constrains the available bore diameter, while the cylinder must provide sufficient extension force to push the boom section against the friction of the boom slide pads under load, and sufficient retraction force to pull the extended boom section back against gravity when the boom is angled upward. The rod must also resist bending from the boom structure loading transmitted through the end fittings.
For boom lift manufacturers and procurement engineers, the HCYY11112009 provides a telescopic cylinder specification optimized for the working pressure and boom geometry of mid-to-large class aerial platforms, with OEM customization capability to match specific boom tube dimensions and extension requirements.
Hydraulic cylinder installation positions on aerial work platforms, including lifting cylinder, boom luffing cylinder, telescopic cylinder, leveling cylinder and steering cylinder.
Installation Position and Function
The main boom telescopic cylinder is installed inside the boom extension mechanism, running along the central axis of the main boom tube with the cap end attached to a fixed bracket inside the inner boom section and the rod end connected to the outer (extending) boom section or to a cable-and-pulley system that multiplies the cylinder stroke into a longer boom extension movement.
When the operator commands boom extension, hydraulic pressure is applied to the piston side of the cylinder. The rod extends, pushing the outer boom section forward along the boom guide rails. The extension speed is controlled by the hydraulic valve, and a proportional valve or flow control ensures smooth acceleration and deceleration of the boom section. When retraction is commanded, pressure applied to the rod side retracts the cylinder, pulling the boom section back. Counterbalance valves in the telescopic cylinder circuit prevent uncontrolled extension or retraction under gravity or boom sag conditions.
The telescopic cylinder experiences significant bending loads from two sources: the misalignment between the cylinder axis and the boom slide pad friction forces during extension under load, and the deflection of the boom structure under working load that introduces a slight angular change at the cylinder end fittings. The cylinder rod must resist these bending loads without eccentric contact with the gland bearing that would cause accelerated wear. The HCYY11112009 is designed with an extended rod guide bearing and appropriate clearances to handle this bending without performance degradation.
Key Features of HCYY11112009 Aerial Work Platform Main Boom Telescopic Cylinder
- Long stroke design providing maximum boom extension distance
- High bending resistance rod and bearing system for internal boom installation
- Optimized bore-to-rod ratio for both extension force and retraction force balance
- Extended rod guide bearing for lateral load support in boom tube installation
- Low-friction seal package for smooth boom extension and retraction under load
- Hard chrome rod for corrosion and wear resistance in internal boom environment
- Compatible with counterbalance valve load-holding circuit integration
- OEM customization: bore, stroke, end fitting, and port configuration for specific boom designs
HCYY11112009 Aerial Work Platform Main Boom Telescopic Cylinder for Technical Specifications
| Parameter | Value |
|---|---|
| Model | HCYY11112009 |
| Cylinder Bore | 100 mm |
| Rod Diameter | 70 mm |
| Stroke | 3200 mm |
| Working Pressure | 20 MPa |
| Maximum Pressure | 28 MPa |
| Installation Distance | 3580 mm |
| Weight | 98 kg |
Engineering Design Advantages
Hydraulic Performance
The 100 mm bore at 20 MPa provides the extension force needed to push the boom section against boom slide pad friction under the full working load at maximum horizontal extension — the most demanding condition for a telescopic cylinder. At this position, the boom is under maximum deflection from its own weight and platform payload, and the slide pad friction forces are highest due to the large bending moment transferred to the pads. The bore and pressure combination is selected to provide an adequate force margin above the maximum calculated friction and inertia load, ensuring reliable extension even in cold ambient conditions when hydraulic oil viscosity increases friction further.
Structural Strength
The 70 mm rod diameter on a 3200 mm stroke is at the boundary of the rod slenderness ratio that requires careful Euler buckling analysis. The rod material selection and the support provided by the boom tube inner wall — which acts as a lateral support for the rod in the extended position — are factored into the buckling calculation. The extended rod guide bearing provides additional lateral support at the gland exit point, which is the most vulnerable point for bending-induced rod deflection. The 98 kg cylinder weight reflects the substantial material required to achieve the required structural strength across this long stroke.
Sealing Reliability
The rod seal system for a 3200 mm stroke cylinder must withstand the accumulated travel distance of a typical boom lift operating cycle, which may include dozens of full extension and retraction cycles per day. The seal contact area per cycle is the full 3200 mm stroke length, making the cumulative seal wear distance far greater than any other cylinder on the machine. We use low-friction seal compounds with high wear resistance ratings for the rod seal in the HCYY11112009 to extend the service interval and reduce the frequency of maintenance interventions on boom lift equipment in active rental fleet service.
Surface Treatment
The hard chrome plating on the 3200 mm rod is specified to a minimum depth that provides adequate wear life for the high cumulative stroke distance of this application. Chrome application on long rods requires careful bath chemistry control to maintain uniform thickness across the full rod length — a manufacturing capability that requires specialized plating equipment and process control. The bore internal finish is maintained to the honing specification required for the piston seal at 20 MPa working pressure.
Durability
The 3580 mm installation distance and 98 kg weight represent the largest cylinder in this aerial platform product series, reflecting the unique demands of a long-stroke internal boom telescopic actuator. The end fitting design at both ends accommodates the small angular misalignment between the cylinder axis and the boom extension direction that occurs as the boom deflects under load, using spherical rod end bearings or self-aligning pin bushings to prevent end-fitting induced bending in the cylinder rod and tube body.
HCYY11112009 Aerial Work Platform Main Boom Telescopic Cylinder Applications
The HCYY11112009 main boom telescopic cylinder is designed for the following aerial work platform applications:
- Telescopic Boom Lift: Primary boom extension actuator for straight single or multi-section telescopic booms
- Articulating Telescopic Boom Lift: Main telescopic section extension cylinder in articulating-telescopic boom combinations
- Large Truck Mounted Aerial Platform: Main boom telescopic cylinder on high-reach truck-mounted aerial platforms
- Mobile Elevating Work Platform (MEWP): High-reach self-propelled MEWP main boom extension cylinder
OEM Hydraulic Cylinder Manufacturing Capability
Telescopic boom cylinders are among the most technically demanding hydraulic cylinders in aerial equipment manufacturing. Our capability for the HCYY11112009 series includes:
- Custom Dimensions: Bore and stroke engineered to match boom tube internal dimensions and required extension distance
- Drawing Approval: Full dimensional drawing with bore, rod, stroke, end fitting, and port specifications for engineering approval
- Prototype Development: First-article sample with dimensional, buckling resistance, and pressure performance report
- Sample Production: Pre-production samples for boom installation fit verification and endurance testing
- Mass Production: Long-stroke cylinder production with specialized honing and chrome plating for consistent quality
- Quality Inspection: Full hydrostatic pressure test, stroke and dimensional inspection, chrome plating thickness verification
Foire aux questions
Why is the telescopic boom cylinder stroke so much longer than other aerial platform cylinders?
The telescopic boom cylinder drives the physical extension of the boom section, so its stroke directly equals the boom extension distance (or the rope-and-pulley ratio times extension distance in cable-driven systems). To provide 3200 mm of boom extension, the cylinder stroke is 3200 mm. Lifting and luffing cylinders convert a relatively short stroke into a larger platform height change through mechanical advantage from the boom structure geometry, so they have much shorter strokes for the same platform height range.
How is the rod diameter selected for a long-stroke telescopic cylinder to prevent buckling?
The rod diameter is selected by analyzing the slenderness ratio (rod length to diameter) against the Euler buckling load formula for the maximum extended rod length and the maximum axial compressive force. The cylinder installation inside the boom tube provides lateral support to the rod that effectively reduces the unsupported rod length and raises the critical buckling load. The end fixity conditions at both cylinder ends also affect the buckling calculation. Our engineering team performs this analysis for each custom stroke requirement.
Can you supply multi-stage telescopic cylinders for booms requiring more extension than a single-stage cylinder provides?
Yes. For boom extensions beyond the practical limit of a single-stage cylinder, we supply two-stage or three-stage telescopic hydraulic cylinders. Multi-stage telescopic cylinders have a much shorter retracted length for the same total extension, which is important when the retracted boom must fit within vehicle transport height limits. Please provide your required extended length, maximum retracted length constraint, and force requirements for a multi-stage cylinder quotation.
What is the lead time for a long-stroke telescopic cylinder with custom bore and stroke dimensions?
Long-stroke custom cylinders have longer production lead times than standard length cylinders due to the specialized honing, chrome plating, and assembly operations required. Prototype lead times for a custom telescopic cylinder are typically 20 to 35 working days from drawing approval, depending on the stroke length and bore diameter. Production batch lead times are confirmed at quotation based on quantity and our current production loading.
What special packaging or transportation is required for a 3.5-meter-long cylinder?
Long telescopic cylinders are packed in custom wooden crates with end cap protection to prevent port thread damage and rod surface contact during transport. All ports are fitted with plastic plugs before packaging. Crate dimensions are supplied with the shipping documentation to support container loading planning. For sea freight, additional corrosion inhibitor packing is applied to the chrome rod and port areas for long transit times. We can also arrange groupage container consolidation with other cylinder orders if required.
Demander un devis for HCYY11112009 Aerial Work Platform Main Boom Telescopic Cylinder
Contact us for OEM hydraulic cylinder quotation, technical drawings and bulk purchasing solutions. Our engineering team responds within 24 hours with dimensional drawings and pricing.
