SEW-EURODRIVE K Series Helical-Bevel Gearmotor

Overview

The SEW-EURODRIVE K series helical-bevel gearmotor (K..DR..) is a right-angle gearmotor family combining a helical-bevel gear unit with an AC motor in a single, rigid monobloc housing. Instead of relying on the sliding friction of a worm gear, the K series uses rolling-contact helical and bevel gear stages to reach efficiencies around 95.5% per gear unit, cutting the heat generated in the drivetrain and the energy wasted as friction compared with older worm-gear reducers doing the same job. The range spans four gear unit sizes, K19 through K49, with heavier K67 through K127 variants available for the largest torque and taper-roller bearing requirements, covering power ratings from 0.05 up to 615 HP, ratios from roughly 3.98 to over 24,000:1, and output torques up to 442,500 lb-in.

Seven Star LLC is an experienced supplier of genuine SEW-EURODRIVE drive technology — gearmotors, gear units, and frequency inverters — to industrial buyers across Oman and the GCC.

Measurement and Operating Principle

A K series gearmotor changes the direction of drive by 90 degrees between the motor shaft and the output shaft, which is why it is called a right-angle design. Power enters through a helical gear stage that reduces speed and increases torque with minimal noise, then passes through a bevel gear stage that redirects the drive axis. Because both stages use meshing gear teeth rather than a sliding worm thread, mechanical efficiency stays high and largely constant across the full speed range — unlike a worm gear, whose efficiency drops sharply as the ratio increases.

The AC motor bolted to the K series gear unit is available across IE1 to IE3/IE4 premium efficiency classes and in 50 Hz, 60 Hz, or dual-frequency global windings, so the same gearmotor platform can be specified once and shipped to sites running either GCC 50 Hz grids or 60 Hz packaged equipment without changing the mechanical design. Low rotor inertia keeps the motor responsive under frequent starts and stops, which matters on conveyor, mixing, and indexing duty where the drive cycles constantly rather than running at a single steady speed.

Engineering Design

The K series gear housing is high-strength cast iron (SAE Class 30 / GG20 equivalent), giving the monobloc design a high cross-section modulus for rigidity under shock loads that meet or exceed AGMA 6009-A00. Gears are manufactured from certified steel, case-hardened to 58-62 Rockwell C, and finish ground or shaved for minimum noise and maximum efficiency. An O-ring at the mounting flange prevents oil leakage when the gearmotor is bolted to a surface that is not perfectly flat, and an exclusive two-piece seal — a patented bi-helix FKM inner seal plus a double-lip Nitrile outer seal — provides three separate sealing surfaces against dust and moisture ingress.

Mounting flexibility covers foot mounting with a torque arm, B14 or B5 flange mounting with a centering tenon, and installation in virtually any orientation. Options extend the platform further: TorqLOC taper hollow-shaft mounting for shaft-mounted installs without a keyway, heavy-duty taper roller bearings on the larger K67-K127 sizes, FKM seals for aggressive environments, forced-cooling fans for low-frequency operation, built-in or external motor encoders, and CSA or ATEX-rated motors for hazardous-area duty — relevant for gas and process plants across the GCC that mix conveying, mixing, and hazardous-area drive requirements on a single site.

Key Features

• K series helical-bevel right-angle design with rolling-contact gears — no worm-gear sliding friction losses
• Reducer efficiency around 95.5%, reducing heat generation and energy cost versus worm-gear alternatives
• Four base sizes (K19-K49) plus heavy-duty K67-K127 variants for high-torque, high-shock service
• Output torques to 442,500 lb-in and ratios from 3.98 up to over 24,000:1
• Case-hardened, ground or shaved gearing rated to AGMA 6009-A00 shock capacity
• Patented bi-helix FKM inner seal plus Nitrile outer seal for three-surface contamination protection
• IE1 to IE3/IE4 motor efficiency classes with 50Hz, 60Hz, or dual-frequency global windings
• Optional TorqLOC hollow-shaft mounting, encoders, forced-cooling fans, and ATEX/CSA hazardous-area motors

Industrial Applications

SEW-EURODRIVE K series gearmotors are common on conveyor drives, mixers and agitators, packaging and material-handling lines, water and wastewater treatment equipment, and any right-angle drive application where a compact footprint and high shock tolerance matter more than the lowest first cost of a worm-gear unit. Their high sustained efficiency also makes them the default upgrade path when a plant is replacing older worm-gear reducers to cut energy consumption on continuously running drives.

Seven Star LLC, as a trusted supplier of genuine SEW-EURODRIVE drive technology across Oman and the GCC, supplies K series gearmotors to conveyor, cement, water treatment, and process manufacturing operators in Muscat, Sohar, and Salalah, alongside application support for sizing the correct gear unit size, ratio, and motor efficiency class for the duty cycle and ambient temperature of each installation.

Frequently Asked Questions

What torque range does the SEW-EURODRIVE K series cover?

The K series spans output torques from roughly 80 Nm up to 442,500 lb-in (about 50,000 Nm) across its K19 through K127 gear unit sizes, depending on ratio and motor selection.

How is a K series helical-bevel gearmotor different from a worm-gear reducer?

The K series uses rolling-contact helical and bevel gear stages instead of a sliding worm thread, giving roughly 95.5% reducer efficiency that stays high across the ratio range, versus a worm gear whose efficiency drops as the ratio increases.

Is the MC07A075-5A3-4-00 part number a gearmotor?

No. MC07 identifies SEW-EURODRIVE’s MOVITRAC 07 frequency inverter series, not a gear unit or gearmotor; this page covers the SEW-EURODRIVE K series helical-bevel gearmotor. For MOVITRAC 07 inverters, contact Seven Star LLC for a separate quotation.

What mounting options are available?

Foot mounting with a torque arm, B14 or B5 flange mounting with a centering tenon, and TorqLOC taper hollow-shaft mounting are all available, and the unit can be ordered for virtually any mounting orientation.

Does Seven Star LLC supply genuine SEW-EURODRIVE gearmotors in Oman?

Yes, Seven Star LLC is an experienced supplier of genuine SEW-EURODRIVE gearmotors, gear units, and drive technology to industrial operators across Oman and the wider GCC, including Muscat, Sohar, and Salalah.

Technical Specifications

Also available: SKF 6206-2RS1 Deep Groove Ball Bearing

Request a Quote

Seven Star LLC is an experienced supplier of genuine SEW-EURODRIVE gearmotors and drive technology across Oman and the GCC. Contact our engineering team for a quotation on the K series helical-bevel gearmotor sized to your torque, ratio, and mounting requirements for your Muscat, Sohar, or Salalah facility — this is a quote-on-request item with no listed price.

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