Reliable and Versatile K Series Helical Gear Motor for Industrial Solutions

◆K Series helical-bevel geared motors deliver right-angle output with efficiency levels matching inline helical units, exceeding 95 percent. Ratios cover from 3.0 to over 200 across powers from 0.12 to 200 kilowatts. How it works: input rotation passes through a helical gear stage before transferring to a spiral bevel gear set. This two-stage configuration redirects power through a 90-degree turn while maintaining high transmission efficiency through precision ground gearing. Foot, flange, shaft, and shrink disc hollow shaft mounting variants accept standard IEC motors directly. Solid shaft and hollow shaft output options accommodate diverse driven equipment interfaces. K Series units drive material handling conveyors, bucket elevators, mixers, packaging lines, textile machinery, and crane travel mechanisms.

▼Key Features

★ Modular design

★ Wide range of gear ratios

★ Rich installation options

★ High precision and low noise

★ Compact size and easy maintenance

★ High transmission efficiency

★ Long lifespan

★ Able to withstand radial loads

▼Specifications

▼HelmeDrive Gearboxes Exporting-K Series Bevel-Helical Gear Motor

▼K Series Bevel-Helical Geared Motors Typical Industrial Applications

�FAQ 

Q 1: For a heavy‑duty, continuous right‑angle drive application (e.g., a long overland conveyor or a heavy mixer), why should I choose HelmeDrive's K series over a worm gearbox or a pure bevel gearbox?

A:

HelmeDrive's K series is a bevel‑helical gear motor– the first stage uses Gleason spiral bevel gears, followed by two stages of helical gears. This design delivers high efficiency (94–96%),high torque density, and excellent continuous‑duty capability– something a worm gearbox cannot offer (worm drives lose efficiency and generate heat under continuous load). A pure bevel gearbox lacks the torque‑multiplying helical stages, so it requires a much larger frame for the same torque.

Where the K series is the optimal choice – heavy‑duty, continuous operation, right‑angle output, no self‑locking requirement:

Typical applications where the K series is the right choice (heavy load, continuous run, needs efficiency and reliability):

· Long overland belt conveyors (mining, cement, ports) – 24/7 operation, energy‑sensitive

· Heavy industrial mixers and agitators – high torque, continuous duty

· Bucket elevators (with optional backstop) – high lift, requires reverse prevention

· Ship unloaders and stacker‑reclaimers – shock loads, high uptime requirement

Example – overland belt conveyor in a copper mine, Chile:

A copper mine in Antofagasta, Chile, needed to replace aging drives on a 2‑km overland conveyor. The application required a right‑angle output, high continuous torque, optional backstop for reverse prevention, and the ability to handle 24/7 operation in a dusty environment. While planetary gearboxes offer higher torque density for compact drives (e.g., bucket wheels or crawler travels), for long overland conveyors where maintenance simplicity and accessory availability (backstop, auxiliary drive) are priorities, the bevel‑helical design is the proven industry standard. The mine chose HelmeDrive K series gear motors. After four years of continuous operation, energy consumption dropped by 12% compared to the old worm units, and the gearboxes have required only annual oil changes. The maintenance manager said: “The K series handles the continuous load without overheating. It’s the right tool for this job.”

Need a heavy‑duty right‑angle drive for 24/7 operation? Send us your torque, speed, and ambient temperature. We will perform a thermal check and recommend the most efficient K series configuration.

Q 2: How reliable is HelmeDrive's K series in applications with shock loads and occasional reversing (e.g., a ship unloader or a mining conveyor start‑stop)? What maintenance does it require?

A:

The K series is designed for shock loads, frequent starts, and even reversing– common in mining, ports, and heavy industrial lines. The Gleason spiral bevel first stage provides smooth, quiet meshing that absorbs shock better than straight bevel gears. The helical stages are carburized and ground for high fatigue resistance.

Key reliability features:

· Spiral bevel first stage:Gleason type – high load capacity, low vibration, handles shock

· Helical stages:Carburized and ground gears – high surface hardness, resists pitting under cyclic loads

· Housing:High‑strength cast iron – rigid under impact

· Optional backstop (non‑reversing device):Essential for inclined conveyors and bucket elevators to prevent reverse rotation on power loss.

Service life expectations:Under correct selection and normal heavy‑duty conditions, main components are designed for extended service life (typically many years). For a specific life estimate based on your duty cycle, consult HelmeDrive.

Maintenance – what you actually need to do (heavy‑duty continuous):

· Oil level check:Weekly visual check through the sight glass or dipstick.

· First oil change:Consult HelmeDrive (typically after 100–150 hours of break‑in, but depends on load).

· Subsequent oil changes:Every 2,000–3,000 operating hours or annually, whichever comes first – but HelmeDrive will confirm based on your specific conditions.

· Routine inspection:Listen for unusual noise (especially from the bevel stage), check housing temperature, look for oil leaks.

· Backstop (if equipped):Inspect during annual shutdown following HelmeDrive’s guidelines.

Example – ship unloader at a port, Brazil:

A port terminal in Santos, Brazil, uses HelmeDrive K series gear motors on their ship unloader’s bucket wheel drive. The application involves frequent starts, stops, and reversing with heavy shock loads. After three years of 24/7 operation, the K series units have required only scheduled oil changes and one backstop inspection. The maintenance supervisor said: “The bevel stage takes the shock without complaint. We have had zero unplanned downtime.”

Operating heavy equipment with shock loads and reversing? Tell us your duty cycle, start frequency, and ambient conditions. We will help you select the right K series size and advise on backstop or brake options.

Q 3: What key factors should I evaluate when investing in a K series bevel‑helical gear motor for a new heavy material handling project to ensure the lowest total cost of ownership?

A:

The K series offers multiple mounting configurations and optional accessories. Choosing the right combination directly affects your installation cost, energy consumption, maintenance frequency, and long‑term reliability.

Three factors that drive your total cost of ownership:

1. Thermal rating – avoid undersizing for continuous duty

The K series runs efficiently, but continuous high torque at low output speeds generates heat. For applications with high ambient temperature (>35°C), very low output speed (<20 r/min), or 24/7 duty, you may need to select a larger frame size. HelmeDrive can perform a thermal check using your operating parameters. Undersizing leads to shortened oil and seal life – and unplanned downtime.

2. Backstop – do you need it?

A backstop (non‑reversing device) prevents reverse rotation when the motor stops. It isessentialfor inclined conveyors and bucket elevators. Adding a backstop at the time of order is much cheaper than retrofitting later. If your application has any risk of reverse running (gravity, backflow, etc.), invest in the backstop upfront.

3. Mounting configuration – foot (GK) or flange (GKF)

If your equipment already has a B5 flange, choose GKF – it saves significant installation time and alignment labor.

What you provide – what HelmeDrive does:

Example – bucket elevator in a cement plant, Turkey:

A cement plant in Izmir, Turkey, needed a right‑angle gear motor for a high‑lift bucket elevator. The elevator required a backstop to prevent reverse descent during power failure. HelmeDrive recommended a K series with flange mounting (GKF) and an integrated backstop. The plant engineer said: “We got a complete package – right‑angle, backstop, and easy flange mounting. No separate coupling, no extra backstop to install. Total installed cost was lower than a comparable European brand.”

Planning a new conveyor, elevator, or heavy mixer with a right‑angle drive? Send us your load, speed, duty cycle, and whether you need a backstop. We will provide a complete K series recommendation with thermal check and total cost analysis.

📬shawn.zhu@helmedrive.com

K Series Bevel-Helical Gear Motor – Application-Based Selection Guide

◆When selecting a bevel-helical gear motor for industrial applications, it is essential to consider not only power and speed but also the unique demands of each sector—compact installation spaces, right-angle power transmission, high starting torque, and reliable operation under shock loads. Below is a practical selection guide based on real-world applications of the HelmeDrive K Series Bevel-Helical Gear Motor—built on real-world data, so you can choose with confidence.

◆The K Series is a bevel-helical gear motor designed for applications where input and output shafts are perpendicular. It combines a bevel gear input stage with helical output stages, providing high efficiency, smooth operation, and high torque density in a compact right-angle configuration. The series features high-strength cast iron housing, case-hardened and precision-ground gears, and multiple mounting options. Key features include compact right-angle design, high efficiency, smooth and quiet operation, and versatile mounting configurations.

▼Product Overview

Note:For detailed power, torque, and ratio tables—including values for specific sizes and operating conditions—please consult HelmeDrive engineering.

▼Understanding HelmeDrive K Series Model Designation

Example: K79-15.93-M1

▼Application Areas

Based on industry-standard load classifications, the K Series is suitable for a wide range of industrial applications where right-angle drives are required:

1. Conveying & Material Handling Applications

Common Pain Points:

n High radial loads from pulleys and sprockets

n Continuous 24/7 operation in dusty environments

n Space constraints requiring compact right-angle drives

n Need for reliable sealing against material spillage

Selection Recommendations:

2. Cranes & Hoisting Applications

Common Pain Points:

n High starting torque under load

n Safety requirements for load holding

n Shock loads during acceleration/braking

n Space constraints in crane machinery houses

Selection Recommendations:

3. Mixing & Agitation Applications

Common Pain Points:

n Variable torque due to viscosity changes

n Smooth, vibration-free operation required

n Vertical mounting with motor above tank

n Quiet operation for indoor environments

Selection Recommendations:

4. Packaging & Automation Applications

Common Pain Points:

n Frequent start-stop cycles in automated lines

n Need for smooth, accurate positioning

n Compact installation in crowded production lines

n Precise indexing and positioning requirements

Selection Recommendations:

★Technical Specifications Reference

For complete power, torque, and ratio tables—including values for specific sizes and operating conditions—please consult HelmeDrive engineering.

1. Frame Sizes and Corresponding Motor Power Ranges (Typical)

Note: Power ranges are indicative; specific values depend on ratio and operating conditions. Consult selection tables for exact ratings.

2. Reduction Ratios (Typical)

The K Series offers a wide selection of reduction ratios across all frame sizes, typically ranging from 5:1 to 100:1. Actual ratios vary by motor power and operating conditions; consult selection tables for precise values.

Note: Actual ratios vary by motor power; consult selection tables for precise values.

3. Efficiency

4. Service Factor Selection

Total service factorfA = fAh × fAc × fAt × fAn

Note: For detailed load classification values, consult HelmeDrive.

5. Gear Unit Constants for Radial Load Conversion

Note: For radial load calculation, use FxL = FRa × a / (b + X) for bearing life, and FxW = c / (f + X) for shaft strength. FRa is the permissible radial load at the shaft midpoint from selection tables.

★What to Know Before You Buy

▸Select the correct mounting position– The K Series supports multiple mounting positions (M1–M6). The default is M1 (foot-mounted, motor horizontal). For other orientations, ensure proper lubrication as oil levels may need adjustment. Vertical mounting (M2, M4) requires special attention to ensure upper bearings are lubricated.

▸Account for service factors– Calculate fA = fAh × fAc × fAt × fAn based on your application’s load type, daily operating hours, start/stop frequency, ambient temperature, and output speed. Ensure the selected gearbox has fB ≥ fA.

▸Calculate radial loads accurately– For overhung loads (sprockets, pulleys, gears), calculate the radial load using Fr = 2 × Mr × fr / d. If the load is not applied at the shaft midpoint, use the conversion formulas with gear unit constants to determine the permissible load at the actual load point.

▸Check axial load capacity– Axial loads up to 5% of the permissible radial load are allowed when no radial load is present. For combined radial and axial loads, or for significant axial loads, consult HelmeDrive.

▸Consider the operating environment– For dusty environments, request enhanced sealing. For outdoor installations, ensure proper protection against moisture. For high ambient temperatures, apply the temperature factor fAt and consider forced lubrication if thermal capacity is a concern.

▸Lubrication is factory-filled– K Series gear units are delivered with oil. The exact oil quantity depends on the mounting position; refer to the oil level mark for proper filling. For vertical mounting, consult HelmeDrive to ensure correct lubrication.

▸Right-angle design is the key feature– The K Series features input and output shafts at 90 degrees, making it ideal for applications where the drive motor must be mounted perpendicular to the driven equipment. This space-saving configuration is perfect for compact machinery layouts and installations with limited space.

▸Let HelmeDrive help with selection– With multiple frame sizes, ratios, and mounting options, proper sizing requires accurate load data. Send your application parameters—load characteristics, required power/speed, duty cycle, mounting position, and environmental conditions—to HelmeDrive for precise gearbox sizing.

By matching your selection to your actual working conditions and operational challenges, you ensure longer equipment life, lower maintenance costs, and higher system reliability.HelmeDrive is committed to providing robust, efficient solutions tailored to your industrial needs.

📬shawn.zhu@helmedrive.com