Alternative for a Danfoss gear motor with directional valve, 9-tooth!

Alternative for a Danfoss gear motor with directional valve, 9-tooth!

4 day ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 3 year year

Product details

SNM21N/017RN02DB V1B5B5NINA/VJJN Gear Motor with Directional Valve: Comprehensive Overview

1. Product Identification & Nomenclature

The modelSNM21N/017RN02DB V1B5B5NINA/VJJNrepresents agear motor with integrated directional valve, designed for hydraulic power transmission. The naming convention typically encodes technical specifications, including:

• SNM21N: Likely denotes themotor series(e.g., SNM series) anddisplacement class(21 cc/rev).

• 017RN02DB: May refer tovalve configuration(e.g., 017 = valve type, RN02 = flow/pressure rating, DB = double-acting valve).

• V1B5B5NINA/VJJN: Additional suffixes indicatingmounting style,porting,shaft options, orseals(e.g., V1 = mounting variant, B5B5 = shaft/flange dimensions, NINA = seal material, VJJN = specific valve features).

2. Key Technical Features

• Gear Motor Core:

• Type: Fixed-displacement gear motor (rotary hydraulic actuator).

• Displacement: 21 cc/rev (hypothetical based on "SNM21N"), translating torque output based on pressure and flow.

• Efficiency: Typically 75–85% (gear motors are less efficient than piston motors but offer cost/simplicity benefits).

• Speed Range: 500–3000 RPM (dependent on flow and load).

• Torque Output: Up to 100–150 Nm (calculated viaT=ΔP⋅q2π T = \frac{\Delta P \cdot q}{2\pi} T=2πΔP⋅q, whereΔP \Delta P ΔP= pressure drop, q = displacement).

• Directional Valve Integration:

• Function: Controls hydraulic fluid flow direction to reverse motor rotation (e.g., for bidirectional motion).

• Valve Type: Likely asolenoid-operated, spring-centered, 4-way/3-position valve(DB suffix suggests double-acting).

• Flow Capacity: Matched to motor displacement (e.g., 17 L/min for "017RN02DB" suffix).

• Control Options: Manual override, solenoid actuation, or proportional control (depending on suffix).

• Mounting & Porting:

• Mounting: Flange-mounted (B5B5 suffix) with SAE/ISO standard bolt patterns.

• Shaft: Keyed or splined (e.g., 25 mm diameter, 10 mm keyway).

• Ports: Standardized threads (e.g., G1/2" or SAE 6-bolt) for easy system integration.

• Seals & Materials:

• Shaft Seal: Nitrile (NINA suffix) or Viton for high-temperature/chemical resistance.

• Housing: Cast iron or aluminum for durability/weight balance.

3. Applications

This gear motor-valve assembly is suited for:

• Mobile Equipment: Forklifts, aerial work platforms, agricultural machinery.

• Industrial Machinery: Conveyors, winches, material handling systems.

• Marine/Offshore: Steering systems, deck machinery.

• Construction: Excavator attachments, drill rigs.

4. Advantages of Integrated Design

• Space Efficiency: Combines motor and valve in a single unit, reducing footprint.

• Cost Savings: Eliminates external plumbing and reduces assembly time.

• Reliability: Fewer leak points and simplified maintenance.

• Control Flexibility: Direct valve integration enables precise motion control (e.g., reversing, braking).

5. Performance Considerations

• Noise: Gear motors are louder than piston motors (70–80 dB(A) under load).

• Efficiency at Partial Load: Fixed-displacement motors operate inefficiently at low speeds/loads.

• Thermal Management: Requires adequate oil cooling if operated continuously at high pressure.

• Valve Response Time: Solenoid-operated valves may have 10–50 ms delays, affecting dynamic performance.

6. Maintenance & Troubleshooting

• Common Issues:

• Leakage: Check shaft seals, O-rings, and port connections.

• Erratic Motion: Verify valve spool cleanliness (contamination can cause sticking).

• Overheating: Ensure oil viscosity matches ambient temperature (e.g., ISO 32 for 20–40°C).

• Recommended Spare Parts:

• Solenoid coils, valve springs, and motor shaft seals.