Domestic first generation NEXEN brake 964818 American Nixon clutch

Domestic first generation NEXEN brake 964818 American Nixon clutch

NEXEN 964818 (model name SBP4-19.0-040) is a spring-loaded, pneumatic release servo motor safety brake (brake) produced by Nexen in the United States. It belongs to the Eclipse series and is commonly referred to as the "first generation NEXEN brake" in China. Its core features are: automatic locking in case of power failure/loss of air (safety braking), release during ventilation, zero backlash, high rigidity, IP67 protection.

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Advantage:

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1、 Core technical parameters (964818)

Brand and model: NEXEN (Nixon/Lisheng) from the United States, P/N 964818， Series SBP4-19.0-040

Braking type: Spring Engaged, Air Release

Static braking torque: 22 N · m (minimum)

Adaptive shaft diameter: 19 mm (keyway shaft)

Speed: 10000 RPM

Release pressure: minimum 5.5 bar; Working pressure 8.3 bar (120 psi)

Inlet interface: 0.125 'NPT

Protection level: IP67 (dustproof and waterproof)

Installation method: Flange Mount, compatible with servo motor/reducer

Axial inertia: 0.00031 kg · m ²

Torsional stiffness: 11800 Nm/Rad

Service life (B10): 100000 cycles

Working temperature: 0~65 ° C (32~150 ° F)

Structure: Fully enclosed, black anodized, zero backlash double cone friction

Limitation: Not recommended for frequent dynamic braking, mainly used for static holding/safety braking

2、 Working principle (spring compression/pneumatic release)

964818 is a typical "safety normally closed" type of brake: it is tightened when there is no air/power supply, and released when there is ventilation.

1. Braking status (default/loss of air/power off)

The internal strong brake spring is in an extended state.

The spring force pushes the pressure plate, tightly pressing the friction plate between the stator (housing) and the rotor (connected to the motor shaft).

*The frictional force generates a static braking torque (22 Nm), locking the motor shaft to prevent rotation or slipping.

Core safety feature: When the gas source is cut off or the system fails, it automatically locks to ensure safety.

2. Release state (ventilation operation)

Inject compressed air at a pressure of ≥ 5.5 bar through the 0.125 'NPT interface.

The air pressure pushes the internal piston, overcomes the spring force, and causes the pressure plate to retract.

Friction plates separate, allowing the rotor and motor shaft to rotate freely.

Adopting a double taper design to ensure zero backlash transmission and braking.

3. Brief process

Ventilation (5.5~8.3 bar) → piston compression spring → friction plate separation → brake release (operation)

Cut off gas (exhaust) → Spring extension → Friction plate compression → Brake (stop/lock)

3、 Explanation of the "First Generation NEXEN" in China

964818 is a classic servo brake model that NEXEN entered the Chinese market early on. It is often referred to as the "first generation NEXEN brake" in the domestic repair/replacement market.

Common substitutes/similar models in the same series: 964817, 964907, 964933.

Main applications: power-off safety braking, position maintenance, and fall prevention for servo motors, robots, CNC machine tools, ball screws, vertical axes, and precision positioning platforms.

4、 Difference from electromagnetic brake (common misconception)

NEXEN 964818: Pneumatic release, pure mechanical spring braking, no need for electricity, IP67， Resistant to harsh environments.

Electromagnetic brake: power on release, power-off spring brake, relying on DC24V power supply, protection usually IP54.

Domestic first generation NEXEN brake 964818 American Nixon clutch

NEXEN products from the United States have become a brand for a wide range of users due to their simplicity, durability, and high quality. The American NEXEN pneumatic clutch is used for high-frequency start/stop intermittent operation, forward and reverse rotation, tension control, overload protection, multi pole transmission, reverse braking, engagement/positioning, and other places.

NEXEN's production line is extremely wide, with a torque range of 2 to 36500N. M. It is widely used in mechanical rubber equipment, chemical equipment, coating equipment, food machinery, packaging machinery, printing machinery, forging equipment, forming machines, woodworking machinery, automatic machines, filling machinery, plywood manufacturing and transportation machinery, pharmaceutical machinery, wire drawing and fiber machinery, metal processing, plywood manufacturing machinery.

1. High bearing temperature:

Reason: The quality of the lubricating oil does not meet the requirements or has deteriorated, the mechanism assembly is too tight (insufficient clearance), the bearing assembly is too tight, the load is too large, the bearing cage or rolling element is broken, etc.

Solution: Replace appropriate lubricating oil, adjust assembly clearance, reduce load, and replace damaged bearing components.

2. Bearing noise:

Reasons: Unqualified quality, impurities inside, improper clearance, improper installation (too tight or too loose), unclean mating surfaces, etc.

Solution: Replace high-quality bearings, adjust clearance, install bearings correctly, and clean mating surfaces.

3. Metal peeling off on the surface of the raceway:

Reason: Excessive load, improper installation, bent shaft, etc.

Solution: Reduce load, install bearings correctly, and correct shaft bending.

4. Pseudo Brinell indentation:

Reason: Vibration and shaking cause wear and tear.

Solution: Improve the fixing and supporting structure of bearings to reduce vibration and shaking.

5. Misalignment (unbalanced load):

Reason: Improper installation resulted in unbalanced load.

Solution: Adjust the installation method to ensure that the bearings are correctly aligned.

The maintenance of couplings mainly includes establishing maintenance records, regular inspections, lubrication and maintenance, cleaning, operation monitoring, and environmental attention.

1. Establish maintenance records: In order to facilitate tracking of the use of couplings, detailed maintenance records should be established. The file should include information such as the model, specifications, installation date, previous inspection records, maintenance records, etc. of the coupling. This helps to promptly identify potential issues and ensure the safe and stable operation of the coupling.

2. Regular inspection: Regularly inspect the coupling, paying attention to whether its components are operating normally, whether there are looseness or cracks, etc. Once wear or damage is found, it should be replaced promptly.

3. Lubrication and maintenance: Lubrication is the core link in maintaining the coupling and should be carried out according to the recommended cycle and method. After each lubrication, it is necessary to confirm whether the lubricating oil is smooth and covers all lubricated parts.

4. Cleaning treatment: Regularly clean the coupling to remove impurities and deposits, ensuring that its function and performance are not affected.

5. Operation monitoring: It is necessary to regularly monitor the operation of the coupling. If any abnormalities are found, the machine should be stopped immediately for inspection and maintenance.

6. Environmental precautions: When using couplings, avoid operating in damp, dusty, or vibrating environments.

In addition, the inspection and maintenance methods for different types of couplings, such as rigid couplings and toothed couplings, also vary. For example, after removing the connecting bolts of a rigid coupling, the plane clearance should be adjusted according to the liquid at different temperatures. The maintenance process of gear couplings is relatively complex, including checking the meshing condition of the tooth surface, measuring the full circle runout and end face circle runout, etc. If necessary, it may be necessary to remove the gear ring and reinstall it.

For diaphragm couplings, in addition to the conventional maintenance measures mentioned above, special attention should be paid to avoiding long-term overload use and operational accidents, and appropriate safety protection measures should be taken.

Common NEXEN American Lisheng models: