Beschreibung
HCYY11112007 Aerial Work Vehicle Steering Control Cylinder
The HCYY11112007 is a heavy-duty aerial work vehicle steering control cylinder engineered to deliver precise directional control for self-propelled boom lifts, rough terrain aerial platforms, and mobile elevating work platforms (MEWP) operating in demanding construction and industrial environments. This steering cylinder provides the hydraulic actuator force that converts steering valve output into wheel angle movement, enabling the machine to navigate job sites, position at work locations, and travel between areas with controlled maneuverability.
The HCYY11112007 differs from basic steering cylinders in its heavier-duty bore and rod specifications, making it appropriate for larger aerial work vehicles with greater axle loads and higher steering forces. The cylinder is designed to maintain consistent steering response under both light maneuvering conditions and the higher steering forces required on rough or uneven terrain where tire-ground forces increase the resistance to wheel angle change.
For aerial equipment OEMs and procurement managers sourcing steering cylinders for heavy rough-terrain platforms or large working-height boom lifts, the HCYY11112007 provides the heavier-duty specification needed for reliable, long-service-life operation in these more demanding applications.
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 HCYY11112007 steering control cylinder is installed transversely across the steering axle, with the cap end connected to the axle housing or frame bracket and the rod end connected to the steering arm or tie rod. On large-format rough terrain boom lifts, the cylinder may be installed in a double-acting configuration where both extension and retraction are powered, rather than relying on the steering linkage return spring to restore straight-ahead position.
When the operator activates the steering input — whether through a steering wheel, joystick, or automatic crab-steer control — the hydraulic steering valve directs pressurized oil to the appropriate end of the cylinder. The piston moves, translating the rod linearly to push or pull the steering linkage and change the wheel angle. The opposing end of the cylinder returns oil to the system reservoir through the return port of the control valve.
On aerial platforms with four-wheel steer or crab-steer capability, the HCYY11112007 is used on both front and rear axles, with the steering valve controlling both cylinders either in phase for crab steering or in opposing phase for tight turning radius. The cylinder must deliver consistent response time and identical stroke lengths on both axles to ensure the vehicle tracks correctly during complex maneuvers. Precise machining of cylinder bore, rod, and clevis dimensions is essential for matched-pair performance in these applications.
Key Features
- Heavy-duty bore for high steering force on large rough-terrain aerial platforms
- Full double-acting design for powered steering in both directions
- Rod guide bearing sized for lateral load resistance from steering geometry
- Hard chrome piston rod with corrosion resistance for outdoor terrain operation
- Low-friction seal package for consistent steering response and reduced operator effort
- Port locations designed for compact installation within axle envelope
- Compatible with matched-pair supply for four-wheel and crab-steer systems
- OEM customization for platform-specific axle geometry and turning radius requirements
Technical Specifications
| Parameter | Value |
|---|---|
| Model | HCYY11112007 |
| Cylinder Bore | 70 mm |
| Rod Diameter | 50 mm |
| Stroke | 210 mm |
| Working Pressure | 16 MPa |
| Maximum Pressure | 24 MPa |
| Installation Distance | 475 mm |
| Weight | 11 kg |
Engineering Design Advantages
Hydraulic Performance
The 70 mm bore provides a 24% larger piston area compared to a 63 mm bore cylinder, delivering proportionally higher steering force at the same system pressure. This additional force capacity is important for large rough-terrain boom lifts where the front axle carries significant machine weight plus the moment from the elevated boom structure. The 210 mm stroke accommodates the larger angular sweep needed for the wider axle track widths typical of rough-terrain aerial platforms, which require more absolute cylinder travel to achieve the same turning angle as narrower industrial platforms.
Structural Strength
The 50 mm rod provides increased cross-sectional area over lighter steering cylinder designs to handle the higher bending moments from larger axle offsets and heavier steered wheel assemblies. The rod material is selected for combined tensile yield and fatigue strength to withstand the cyclical loading pattern of continuous steering corrections during rough-terrain travel. The rod-to-bore ratio maintains adequate annular oil area on the rod side to ensure adequate return force for powered steering retraction under all operating conditions.
Sealing Reliability
Rough-terrain aerial platforms operate in environments where steering cylinders are exposed to mud, rock dust, construction debris, and water. The rod seal design uses a heavy-duty wiper as the primary contamination barrier, with a secondary rod seal maintaining hydraulic fluid retention. The wiper seal material is selected for resistance to the abrasive particulate contamination typical of construction and quarry site environments, extending the service interval between seal replacements.
Oberflächenbehandlung
The piston rod chrome plating on the HCYY11112007 is specified for a thicker minimum deposit compared to standard steering cylinders, in recognition of the more aggressive surface contamination environment of rough-terrain applications. The chrome hardness also provides resistance to the impact damage that can occur when the rod is exposed to flying rock or debris during rough terrain travel. Cylinder body coating uses a zinc-phosphate primer under polyurethane topcoat for long-term outdoor weather resistance.
Durability
At 11 kg, the HCYY11112007 reflects the additional material in the larger bore and heavier rod compared to the HCYY11112004, while remaining compact enough to fit within the constrained envelope of a rigid front axle. The 475 mm installation distance and 210 mm stroke are typical for the axle geometry of mid-to-large class rough-terrain boom lifts with working heights in the 18 to 30 meter range.
HCYY11112007 Aerial Work Vehicle Steering Control Cylinder Applications
The HCYY11112007 steering control cylinder is suited for the following larger aerial work vehicle types:
- Rough Terrain Telescopic Boom Lift: Front axle steering for large working-height rough terrain machines
- Four-Wheel Steer Articulating Boom Lift: Matched-pair supply for front and rear axle crab-steer systems
- Large Self-Propelled MEWP: Steering actuator for high-capacity rough-terrain MEWP designs
- Truck Mounted Heavy Aerial Platform: Outrigger steering or auxiliary axle steering for large truck-mounted units
OEM Hydraulic Cylinder Manufacturing Capability
The HCYY11112007 is available for OEM serial production with the following manufacturing support capabilities:
- Custom Dimensions: Bore, rod, stroke, and clevis geometry tailored to axle design and turning radius requirement
- Drawing Approval: Complete dimensional package with all interface, port, and mounting specifications
- Prototype Development: First-article sample with full dimensional and pressure test report
- Sample Production: Matched pairs for four-wheel steer verification testing on chassis
- Mass Production: Serial production with consistent dimensional quality for assembly line supply
- Quality Inspection: Pressure test, dimensional inspection, and chrome surface verification for each unit
Häufig gestellte Fragen
When should I choose the HCYY11112007 over the smaller HCYY11112004 steering cylinder?
The HCYY11112007 is appropriate for aerial platforms with heavier axle loads, wider track widths, or rougher terrain operation where higher steering forces are needed. If your platform has a gross vehicle weight above 8,000 kg, uses large-diameter rough terrain tires, or operates on slopes where tire-ground resistance is elevated, the 70 mm bore of the HCYY11112007 provides the additional steering force margin needed for reliable operation.
Can you supply matched pairs for four-wheel steer systems with identical dimensions?
Yes. Matched pairs are produced from the same production batch with inspection to tighter dimensional tolerances than standard to ensure consistent stroke and clevis dimensions across both cylinders. We can also supply matched sets of four cylinders for platforms with independent steering on all four wheels. Please specify matched-pair requirement in your RFQ.
What is the best seal type for rough terrain operation with mud exposure?
For rough terrain with mud and abrasive contamination, we recommend the heavy-duty wiper seal option with extended wiper lip contact pressure. Additionally, a secondary scraper ring can be added inboard of the wiper for extreme contamination environments such as quarry or soft-ground earthwork sites. Please specify the operating environment in your enquiry so we can recommend the appropriate seal specification.
How do you ensure consistent steering performance between the front and rear steering cylinders?
For four-wheel steer applications, we apply tighter bore and stroke tolerances during production inspection to ensure volumetric consistency between front and rear cylinders. This means equal oil volume produces equal wheel angle on both axles, which is required for proper crab-steer tracking without vehicle lateral drift. The inspection report for matched-pair orders includes bore and stroke measurements for each individual cylinder.
What is the minimum order quantity for the HCYY11112007 steering control cylinder?
We accept orders from single-unit sample quantities for engineering evaluation through to full production batch orders. Pricing is structured by volume bracket with better unit pricing at higher quantities. For maintenance spare parts inventories, we can discuss stock-and-release agreements that provide volume pricing with scheduled delivery releases to match your inventory requirement. Please submit an RFQ with your expected monthly or annual quantity for pricing details.
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