BLD/XLD Flange Mounting Cycloidal Speed Reducer

◆BLD and XLD Series flange-mounted cycloidal reducers deliver high ratio reduction in a compact inline package. Single-stage ratios span 9 to 87 with efficiency above 90 percent, and motor powers range from 0.12 to 30 kilowatts. How it works: an eccentric bearing drives the cycloidal disc to wobble inside a ring of fixed pins. This rolling motion produces smooth speed reduction through the small tooth difference principle, with load shared across multiple contact surfaces. The mechanism withstands shock loads and temporary overloads without damage. Flange mounting with hollow output shaft simplifies direct machine integration. Solid shaft variants are also available. These units suit mixers, conveyor drives, textile machinery, food processing equipment, hoisting applications, and agitators where compact right-angle or inline flange mounting is required.

▼Key Features

★ Compact size

★ Easy maintenance

★ Non-constant meshing

★ Wide range of gear ratios

★ Smooth operation with multiple tooth engagement

★ Low moment of inertia

▼Specifications

▼HelmeDrive Gearboxes Exporting-BLD/XLD Flange Mounting Cycloidal Speed Reducer

▼BLD And XLD Series Flange-Mounted Cyclo Reducers Typical Industrial Applications

�FAQ

Q 1: What makes a cycloidal speed reducer better than a traditional gearbox for vertical agitator applications?

A:

A cycloidal speed reducer uses acycloidal pinwheel meshing principle(a type of planetary transmission with a small tooth difference). Multiple teeth stay in contact simultaneously, distributing load evenly. For vertical agitators, this design offers specific advantages.

How a cycloidal gearbox differs for vertical mounting:

        Where a cyclo drive reducer excels in vertical installations:

· Tank-top agitators (chemical, pharmaceutical, food)

· Reactor stirrers with frequent start-stop

· Mixers with variable viscosity loads

Case example – pharmaceutical reactor agitator (cycloidal vs. helical):

A pharmaceutical plant in Switzerland previously used helical gear motors on their reactor agitators. The helical units required oversized motors to handle frequent reversing during batch processing. When they switched to BLD cycloidal reducers, they used thesame motor sizebut achieved smoother operation and lower vibration. The plant engineer noted: “The rolling contact design eliminated the jerky starts we had with gear teeth.”

For vertical agitator applications, a cycloidal gear reducer often outperforms traditional gearboxes. Send us your tank size and mixing speed — we’ll recommend the right model.

Q 2: How long will a BLD/XLD cycloidal gearbox last in a vertical installation? What maintenance does it need?

A:

The BLD/XLD series is designed for long service life with minimal maintenance. Key components — cycloidal discs, pins, and pin sleeves — are manufactured from bearing steel, case-hardened for high wear resistance and long service life.

Service life expectations:

· Under normal load conditions, the main bearings and cycloidal discs are designed forextended service life

· Oil seals should be inspected and replaced during scheduled maintenance

Vertical mounting lubrication:

· Standard units use oil bath lubrication

· For vertical installations (motor above or below), ensure oil level covers the upper bearings to guarantee adequate lubrication

· Always specify mounting position when ordering

Maintenance schedule:

· Change lubricating oil according to operating conditions; refer to oil level marks

· Regularly check oil level and top up with the same grade of lubricant

· Inspect for unusual noise or leakage during routine operation

Case example – water treatment aerator (unique vertical application for cycloidal):

A municipal water treatment plant in Egypt uses BLD cycloidal reducers on their vertical aerators. The original helical gearboxes required bearing replacement every 2 years due to intermittent operation and high humidity. After switching to cycloidal, the units have run5 yearswith no bearing failures. The maintenance supervisor said: “The sealed flange mounting keeps moisture out, and the rolling contact handles start-stop better.”

For vertical industrial cycloidal gearbox applications, we can help you set up the right lubrication configuration. Share your mounting position and operating hours.

Q 3: What key factors determine the long-term value of a flange-mounted cycloidal speed reducer for vertical equipment?

A:

Flange-mounted cycloidal reducers (BLD/XLD) offer acompetitive upfront pricecompared to helical or planetary gearboxes of similar specifications. The best value comes from evaluating total cost of ownership for your specific vertical application.

Key factors to evaluate for total cost of ownership:

How to compare total cost of ownership:

Case example – food mixing tank (cycloidal vs. helical from another brand):

A food processing plant in Thailand used helical gearboxes from a European brand on their vertical mixing tanks. The helical units worked well but required annual bearing replacements due to frequent batch start-stops. After analysis, they switched to BLD cycloidal reducers. The cycloidal units have run3 yearswith no bearing issues. The procurement manager noted: “We got longer life for a competitive upfront cost.”

Cycloidal reducers aren’t right for every vertical application — but where they fit (frequent starts, reversing, shock loads), they deliver long-term value. Send us your agitator duty cycle and we’ll tell you if cycloidal is the right choice.

📬shawn.zhu@helmedrive.com

BLD/XLD Series Flange Mounting Cycloidal Speed Reducer – Application-Based Selection Guide

◆When selecting a cycloidal speed reducer for industrial applications, it is essential to consider not only power and speed but also the actual working conditions, environmental factors, and operational pain points. Below is a practical selection guide based on real-world applications of the HelmeDrive BLD/XLD Series Flange Mounting Cycloidal Speed Reducer—built on real-world data, so you can choose with confidence.

◆The BLD/XLD Series is a high-efficiency cycloidal speed reducer utilizing the principle of planetary transmission with cycloidal pinwheel meshing. It features a compact structure with coaxial input and output shafts, high reduction ratios in a single stage (up to 1:87), and efficiency above 90% for single-stage units. Key components are manufactured from bearing steel, ensuring high mechanical strength, smooth rolling friction, and long service life. The flange mounting configuration makes it particularly suitable for vertical installations where space is at a premium or where direct mounting to equipment flanges is required.

▼Product Overview

▼Understanding HelmeDrive BLD/XLD Model Designation

▼Application Areas

Based on industry-standard load classifications, the BLD/XLD Series is suitable for a wide range of industrial applications, particularly where flange mounting is advantageous:

1. Mixing & Agitation Applications (Vertical Mounting)

Common Pain Points:

n Vertical mounting with motor above tank

n High starting torque due to viscous materials or settled solids

n Frequent start-stop cycles in batch processing

n Need for smooth, vibration-free operation

n Corrosive environments (chemicals, slurries)

Selection Recommendations:

2. Conveyor & Material Handling Applications

Common Pain Points:

n High radial loads from pulleys and sprockets

n Continuous operation in dusty environments

n Need for reliable sealing against material spillage

n Space constraints requiring flange mounting

Selection Recommendations:

3. Reactor & Tank Agitator Applications

Common Pain Points:

n Motor mounted above tank for hygiene or process reasons

n Need for flange mounting to match tank top openings

n Corrosive environment from chemicals or cleaning agents

n Smooth, vibration-free operation required to protect vessel

Selection Recommendations:

★Technical Specifications Reference

1. Reduction Ratios

Note: Two-stage ratios are typically combinations of single-stage ratios (e.g., 9×11=99, 11×11=121, 17×11=187, etc.).

2. Frame Sizes

3. Service Factor Selection

Additional Factors:

n Start/stop frequency:<10/h → 1.0; <100/h → 1.15; <500/h → 1.25

n Ambient temperature:+30°C → 1.05; +40°C → 1.15; +50°C → 1.3; +60°C → 1.5

4. Radial Load Calculation

For loads not applied at the shaft midpoint:

When 0 ≤ X < L/2: Fx = [1.25 - (X / 2L)] × Fra

When X = L/2: Fx = Fra

When L/2 < X ≤ L: Fx = [1.6 - (1.2X / L)] × Fra

Where:

² Fra= Permissible radial load at shaft midpoint (from rating tables)

² Fx= Permissible radial load at actual load application point

² X= Distance from shaft shoulder to load application point

² L= Output shaft length (from dimensional drawings)

★What to Know Before You Buy

▸Flange mounting configuration– The BLD/XLD Series is designed for flange mounting, making it ideal for vertical installations such as tank-top agitators, or for horizontal installations where flange mounting provides a more compact footprint than foot mounting.

▸Understand the output shaft rotation– For single-stage units, the output shaft rotates in the opposite direction to the input shaft. For two-stage units, the output shaft rotates in the same direction as the input shaft.

▸No self-locking capability– Cycloidal reducers do not have self-locking capability. For hoisting or lifting applications, use a brake motor or add a braking device to prevent load drop.

▸Axial load limitation– The output shaft is designed to withstand radial loads only. It cannot accept axial loads. Ensure that no axial force is applied to the output shaft.

▸Vertical mounting lubrication– For vertical installations (M4 mounting position), proper lubrication of upper bearings is critical. The standard lubrication system is designed for horizontal mounting; vertical applications may require additional lubrication measures. Consult HelmeDrive for vertical mounting applications.

▸Lubrication type depends on size– Smaller models (e.g., BL09, BL0, BL1, BL2, BL3) are grease-lubricated and shipped with grease. Larger models require oil bath lubrication. Always check the lubrication table for your specific model and mounting position.

▸Consider the operating environment– For applications with frequent start-stop, reversing, high ambient temperatures, or corrosive environments, consult HelmeDrive for special considerations and appropriate service factors.

▸Calculate radial loads accurately– If the load is applied at the shaft end rather than the midpoint, use the radial load correction formula to verify that the actual load does not exceed the permissible value.

▸Let HelmeDrive help with selection– Proper sizing requires accurate load data, duty cycle information, and environmental conditions. Send your application parameters 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