MC2RVSF09 ka87 sew bevel-helical speed reducer

The combination of the MC2RVSF09 and the KA87 represents two different tiers of SEW-EURODRIVE’s power transmission portfolio. While both are bevel-helical speed reducers, they serve very different scales of industrial demand.

The MC series is a massive industrial gear unit for heavy-duty torque, whereas the K-series (KA87) is a high-precision, high-efficiency modular gearmotor.

1. MC2RVSF09: The Heavy-Duty Powerhouse

The MC series is designed for "Industrial Gear" applications where torque is measured in kilonewton-meters (kNm).

• MC (Modular Compact): A rugged "block" housing designed to withstand extreme mechanical stress.
• 2 (Two-Stage): Optimized for higher output speeds and maximum mechanical efficiency. It uses fewer gear meshes to minimize heat generation.
• RV (Bevel-Helical): A right-angle configuration.
• SF (Solid Shaft & Flange): Features a solid output shaft and a mounting flange. This is typical for "B5" flange mounting directly onto a machine wall or a large agitator frame.
• 09 (Frame Size): This unit is a "size 09," meaning it handles nominal torques in the range of 20 kNm to 25 kNm.

2. KA87: The Modular Precision Gearbox

The KA87 is part of the standard modular "K-series" bevel-helical range. It is much smaller than the MC series and is typically used for precise automation and medium-duty conveying.

• K (Bevel-Helical): Known for being over 90% efficient, making it a superior energy-saving alternative to worm gearboxes.
• A (Hollow Shaft): The "A" designates a hollow shaft with a keyway, allowing it to slide directly onto the driven machine's shaft.
• 87 (Frame Size): The "87" size is one of the most popular in the world. It provides a maximum torque of approximately 2,700 Nm.

Comparison: MC2RVSF09 vs. KA87

3. Engineering Advantage: Bevel-Helical Design

Both units share the Bevel-Helical geometry. Unlike worm gears that lose energy through sliding friction (which creates heat), bevel-helical gears use rolling contact.

• High Efficiency: Both units maintain high efficiency across all gear ratios.
• Right-Angle Savings: The 90-degree turn allows the motor to be mounted parallel to the machine, saving significant aisle space in factories.
• Quiet Operation: SEW uses high-quality ground gearing, which reduces "gear whine" even at high input speeds.

4. Maintenance and Lubrication

For both the MC2 and the K87, lubrication is the lifeblood of the system.

1. Oil Selection: For the MC2RVSF09, synthetic oil is often preferred (CLP HC) due to the higher thermal loads. For the KA87, mineral oil is standard, though synthetic is used for "Food Grade" or extreme temperature environments.
2. Mounting Position: The amount of oil required depends strictly on the mounting position (M1 through M6). For the KA87, the "A" (Hollow Shaft) design must ensure the upper bearings are properly lubricated if mounted vertically.
3. Sealing: These units often utilize radial oil seals. In dusty environments (like cement or wood processing), a "Taconite" or double-lip seal is recommended to prevent grit from scoring the shaft.

5. Integration in Singapore Industry

In Singapore's industrial landscape (Tuas/Jurong), these two units are often found working together in the same plant:

• An MC2RVSF09 might be used as the main drive for a large industrial wastewater agitator or a heavy-duty incline conveyor at a port.
• A KA87 might be used for the smaller auxiliary conveyors or the precise positioning arms on the same production line.

Are you looking to replace a specific unit, or are you sizing these for a new project? Knowing the required output torque ($M_a$) and speed ($n_a$) would help determine which of these two very different sizes is the correct fit.