Precision-engineered ZY Series Cylindrical Gearbox for Industrial Solutions

◆ZY Series parallel shaft cylindrical gear reducers employ case hardened helical gears with tooth flank hardness reaching 58 to 62 HRC. Single stage efficiency surpasses 96.5 percent, while two and three stage configurations maintain efficiency above 93 and 90 percent respectively. Ratios span from 1.25 to 560 with input speeds up to 1500 revolutions per minute. How it works: input rotation transfers through precision ground helical gear pairs arranged on parallel shafts. This cylindrical gear geometry ensures uniform tooth contact and smooth power transmission with minimal axial thrust. ZDY, ZLY, ZSY, and ZFY configurations correspond to one through four stage reduction, covering center distances from 80 to 710 millimeters. Foot mounting accepts direct motor coupling via flexible coupling or belt drive input. ZY units drive belt conveyors, bucket elevators, mixers, aerators, rolling mill roller tables, and centrifugal pumps across mining, cement, chemical, and material handling industries.

▼Key Features

• ★ High precision, low noise

• ★ Small size, lightweight

• ★ Long lifespan,easy maintenance,high load-bearing capacity

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▼Specifications

▼HelmeDrive Gearboxes Exporting-ZY Series/ZDY ZSY ZLY ZFY Cylindrical Gearbox

▼ZY Series Parallel Shaft Cylindrical Gear Reducers Typical Industrial Applications

�FAQ

Q 1: What makes the ZY series parallel shaft helical gear reducer different from a standard gearbox?

A:

The ZY series is aparallel shaft helical gear reducer— input and output shafts are parallel, not offset. What sets it apart is the gear metallurgy and finishing.

According to the HelmeDrive ZY : gears are made fromhigh-strength low-alloy steel, carburized and quenched toHRC58–62 surface hardness, then precision ground. That’s the same process used in high-end industrial gearboxes but at a more competitive price point.

How ZY compares to a standard helical gearbox:

Where the ZY cylindrical gear reducer really works:

· Conveyors in mining and cement (heavy duty, continuous run)

· Steel mill roller tables (shock loads, high temperature)

· Any parallel shaft application needing long life without frequent rebuilds

Example – limestone crusher feed conveyor in Vietnam:

A cement plant Ha Nam province, Vietnam, used a locally assembled helical gearbox on their crusher feed conveyor. Bearings failed every 18 months. They replaced it with a HelmeDrive ZSY three-stage cylindrical reducer. After three years, zero failures. The plant manager said: “The hardened gears just last longer. We don’t touch it.”

Not sure which stage you need — ZDY, ZLY, ZSY, or ZFY? Send us your ratio and power. We’ll pick the right one.

Q 2: How reliable is the ZY cylindrical gearbox for 24/7 industrial operation? What maintenance does it really need?

A:

The ZY series is built forcontinuous duty— 24 hours a day, 7 days a week. Specifies ambient temperature range -40°C to +45°C, input speed up to 1500 r/min, and gear peripheral speed up to 20 m/s.

Why it stays reliable:

Maintenance – straight :

· First 50 hours– Check mounting bolts for tightness.

· 100–150 hours– First oil change (flushes break‑in debris).

· Every 2000–3000 hours or annually– Change oil thereafter (depending on operating conditions).

· Regular checks– Oil level, temperature, unusual noise.

Ffor ambient temperatures below 0°C, preheat the oil before startup. Use recommended EP gear oil (CKD220 or CKD320 for most conditions).

Example – coal conveyor in Poland (heavy duty, cold climate):

A Polish coal mine ran ZY cylindrical reducers on their overland conveyors. Winter temperatures drop to -25°C. They followed cold-weather procedure — preheated oil before start. The gearboxes have run five years with only scheduled oil changes. The maintenance supervisor told us: “We’ve had zero gear failures. The hardness spec is real.”

Running in extreme cold or heat? Tell us your ambient temperature. We’ll recommend the right oil viscosity and any special startup procedure.

Q 3: What key factors determine the long-term value of a ZY series cylindrical gear reducer for a new bulk handling project?

A:

Buying a gearbox is easy. Buying the right gearbox for 10 years of service takes a few more minutes. Here’s what actually matters.

Before you sign the PO, check these:

Total cost of ownership – rough guide:

Example – steel mill roller table in Mexico (high shock, frequent reversing):

A Mexican steel mill used low-cost cylindrical gearboxes on their roller tables. Shock loads from hot slabs cracked gear teeth every 12–14 months. They switched to HelmeDrive ZLY two-stage reducers. After two years, no tooth cracks. The maintenance planner said: “The carburized gears handle shock that would break ordinary gears. We’ve cut our spare parts budget in half.”

Parallel shaft gearboxes look simple, but the details — hardness, thermal rating, radial load — determine how long they last. Send us your drive data sheet. We’ll run the full selection and thermal check.

📬shawn.zhu@helmedrive.com

ZY Series Cylindrical Gear Speed Reducer – Application-Based Selection Guide

◆When selecting a cylindrical gear speed reducer for heavy industrial applications across metallurgy, mining, material handling, cement, and chemical processing, it is essential to consider not only power and speed but also the unique demands of each sector—continuous operation, high torque density, shock loads, and diverse environmental conditions. Below is a practical selection guide based on real-world applications of the HelmeDrive ZY Series Cylindrical Gear Speed Reducer—built on real-world data, so you can choose with confidence.

◆The ZY Series is a comprehensive range of hard-tooth-surface cylindrical gear reducers designed to meet the rigorous demands of industries such as metallurgy, mining, cement, chemicals, petroleum, and construction machinery. The series includes:

· ZDY– Single-stage cylindrical gear reducer

· ZLY– Two-stage cylindrical gear reducer

· ZSY– Three-stage cylindrical gear reducer

· ZFY– Four-stage cylindrical gear reducer

The series features case-hardened and precision-ground gears (surface hardness HRC 58–62) with high efficiency (single-stage up to 96.5%, double-stage up to 93%, triple-stage above 90%), smooth operation, low noise, and long service life.

▼Product Overview

Note:  For detailed power, torque, and thermal rating tables (including values for specific sizes and ratios), please consult HelmeDrive engineering.

▼Understanding HelmeDrive ZY Model Designation

Example: ZDY355-4.5-I

▼Application Areas

Based on industry-standard load classifications, the ZY Series is suitable for a wide range of industrial applications:

1. Conveying Systems Applications

Common Pain Points:

n High radial loads from pulleys and rollers

n Continuous 24/7 operation in dusty environments

n Need for reliable sealing against material spillage

n Frequent start-stop in automated logistics

Selection Recommendations:

2. Mining & Cement Industry Applications

Common Pain Points:

n Severe impact loads from crushers and mills

n Abrasive dust causing wear and seal failure

n High ambient temperatures in kiln areas

n Continuous 24/7 operation with high torque requirements

Selection Recommendations:

3. Steel Industry Applications

Common Pain Points:

n Heavy shock loads from rolling and shearing operations

n High ambient temperatures

n Frequent reversing operation

n Continuous heavy-duty operation

Selection Recommendations:

4. 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 Need for reliable backstop to prevent reverse rotation

Selection Recommendations:

★Technical Specifications Reference

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

1. Reduction Ratios

2. Frame Sizes (Center Distance in mm)

3. Efficiency

4. Service Factor Selection (KA)

Note: For complete load classification, consult HelmeDrive.

5. Safety Factor (SA)

6. Thermal Power Correction Factors

Note: For thermal power PG1 and PG2 values, consult HelmeDrive.

7. Permissible Radial Load on Shaft Extension

Note: T1 and T2 are permissible input and output torques. For torque values, consult HelmeDrive.

★What to Know Before You Buy

▸Select the correct series based on ratio– Use ZDY (single-stage) for ratios 1.25–5.6, ZLY (two-stage) for ratios 6.3–20, ZSY (three-stage) for ratios 22.4–100, and ZFY (four-stage) for ratios 100–500. This ensures optimal efficiency and load sharing.

▸Account for service factors– Multiply the required power by KA (load factor) based on load type (U/M/H) and daily operating hours, then by SA (safety factor) based on the consequence of failure.

▸Check thermal power for continuous duty– Calculate P₂ × f1 × f2 × f3 and compare with thermal power values (PG1 without cooling, PG2 with cooling coil). If the calculated value exceeds the thermal rating, forced lubrication with cooling is required.

▸Verify radial loads on shafts– If the application involves overhung loads (sprockets, pulleys, gears), calculate the radial load and compare with permissible values. Use the formula and torque values provided; for precise torque ratings, consult HelmeDrive.

▸Check peak torque conditions– For applications with starting or braking torque exceeding normal operating torque, verify that the peak torque does not exceed 1.8 × rated torque.

▸Consider backstop requirements– For inclined conveyors, elevators, or hoists where reverse rotation is unacceptable, specify the backstop option (available for ZLY and ZSY series). Note that when a backstop is fitted, the gearbox is designed for unidirectional operation only.

▸Lubrication matters– Standard units are splash-lubricated. For continuous high-power operation or high ambient temperatures, consider forced lubrication with cooling coil. For larger sizes or critical applications, forced lubrication is recommended.

▸Ambient temperature– The ZY Series operates in -40°C to +45°C . At temperatures below 0°C, preheat the lubricant before startup. Use the ambient temperature correction factor f1 for thermal power calculations.

▸Let HelmeDrive help with selection– With multiple series, frame sizes, and ratio options, proper sizing requires accurate load data. Send your application parameters—load characteristics, required power, input/output speed, duty cycle, ambient conditions, and any special requirements—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 heavy industrial needs.

📬shawn.zhu@helmedrive.com