Steering Cylinder

Bore: Φ140 mm

Rod: Φ70 mm

Stroke: 447 mm (per steering linkage geometry)

Operating pressure: continuous 22 MPa, max 25 MPa

Max push force: 384 kN (at 25 MPa, full-bore side)

Max pull force: 288 kN (at 25 MPa, annular side)

Breakaway pressure: ≤0.4 MPa

Piston velocity: <0.5 m/s (rapid steering response)

Operating frequency: high-frequency intermittent, several to dozens of steering corrections per work cycle

Internal leakage: ≤0.03 ml/min (at 22 MPa, over seal service life)

Temperature range: -20 ℃ to +80 ℃ (standard); -40 ℃ to +120 ℃ customizable

Suitable for: fully hydraulic drilling jumbos, mining jumbos, underground articulated vehicles, etc.

Ultra-High-Pressure Double-Acting Heavy-Duty Design

The barrel is forged from high-yield-ratio quenched and tempered alloy steel, with welds UT/MT inspected and end caps FEA-optimized. The piston rod is a large-diameter thick-walled rod, precision hard-chrome plated (HV900–1100), maintaining exceptional structural integrity under 25 MPa continuous pressure and heavy underground steering loads. Fatigue life exceeds 1 million full-load cycles.

High Side-Load Resistance & Guidance

Embedded wide bronze or composite guide rings with precision clearance control absorb radial forces during articulated steering and offset driving, preventing rod scoring or bending and ensuring long-term smooth motion.

Multi-Stage Seals & Dust Protection

Multiple heavy-duty wipers and a metal scraper ring at the gland effectively block rock dust, cuttings, slurry, and underground moisture. The main seal is a hydrolysis-resistant polyurethane and filled PTFE composite, guaranteeing zero external leakage under high-pressure, high-frequency, and harsh underground conditions.

Internal Cushioning for Noise Reduction

Progressive cushioning devices at both piston ends automatically decelerate and absorb impact energy at steering limits, eliminating rigid impacts, reducing noise, and protecting the steering linkage and the cylinder itself.

Compact Design & Flexible Mounting

The optimized envelope and mounting dimensions fit the jumbo’s compact chassis steering space. Self-lubricating composite bushings at all pivot points eliminate daily greasing and provide long service life under high-frequency steering and harsh underground conditions.

Optional Smart Monitoring

A built-in displacement sensor can be integrated to provide real-time steering angle feedback, supporting assisted autonomous driving and remote monitoring via the jumbo’s electronic control system.

Special bore, rod, and stroke

Built-in displacement sensor for closed-loop steering angle control

Full stainless steel body and piston rod (highly corrosive environments)

Explosion-proof / mining certifications

Special mounting flanges and port configurations