QJM02-0.4Z series steel ball motor

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Product details

QJM02-0.4Z Series Steel Ball Motor Technical Overview

TheQJM02-0.4Zis acompact, low-power hydraulic motordesigned for applications requiringhigh torque at low speeds, leveraging asteel ball valve mechanismfor precise flow control. Below is a structured breakdown of its key features, technical specifications, and applications.

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1. Key Technical Specifications

【表格】

Parameter Details

Model Code QJM02-0.4Z

Series QJM02 (Entry-level/light-duty)

Displacement 0.4 cm³/rev (approx. 0.024 in³/rev)

Rated Pressure 16 MPa (2,320 psi) (typical for QJM02 series)

Max. Peak Pressure 20 MPa (2,900 psi) (short-term operation)

Rated Speed 50–300 RPM (optimized for low-speed applications)

Max. Torque Output ~60 Nm (44 lb·ft) @ 16 MPa

Efficiency Mechanical: ~85%, Volumetric: ~90% (typical for steel ball motors)

Mounting Style SAE B/ISO 2-bolt flange (common in compact hydraulic systems)

Shaft Configuration Straight keyed shaft (DIN 5480 or similar standard)

Porting G1/4" BSPP (parallel) (or NPT option for North America)

Weight ~2.5 kg (5.5 lb) (depending on mounting/shaft variants)

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2. Core Design Features

• Steel Ball Valve Mechanism:

• Usesprecision-ground steel ballsto control oil flow direction, enablingbidirectional operationwith minimal leakage.

• Advantages: High efficiency, compact size, and resistance to contamination compared to gear motors.

• Low Displacement (0.4 cm³/rev):

• Ideal forlow-flow, high-pressure systems(e.g., handheld tools, small winches).

• Example: A 10 L/min (2.6 GPM) pump would drive the motor at~416 RPM(ignoring volumetric losses).

• Z-Series Variants (0.4Z):

• The"Z" suffixtypically denotes:

• Enhanced sealing(e.g., Viton O-rings for chemical resistance).

• Mounting adaptability(e.g., optional side ports or foot mounts).

• Pressure-rated upgrades(e.g., 20 MPa vs. standard 16 MPa).

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3. Performance Characteristics

• Torque-Speed Curve:

• Producespeak torque near zero speed(typical for low-displacement motors).

• Example: At 16 MPa, torque drops by ~5% per 100 RPM increase above 100 RPM.

• Efficiency vs. Speed:

• Mechanical efficiencypeaks at~88%(100–200 RPM).

• Volumetric efficiencydegrades below 50 RPM due to internal leakage.

• Noise Level:

• <70 dB(A)(quieter than gear motors due to smooth ball valve action).

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4. Applications

TheQJM02-0.4Zis suited for:

• Light Industrial Equipment:

• Hydraulic winches(e.g., small trailer winches, boat davits).

• Actuators(e.g., gate openers, tilt mechanisms).

• Mobile Machinery:

• Mini excavators(auxiliary circuits).

• Agricultural tools(e.g., feed mixers, small augers).

• Specialized Tools:

• Hydraulic torque wrenches(compact, high-torque output).

• Robotic grippers(precise, low-speed control).

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Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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