Reliable and Versatile H Series Gear Speed Reducer for Industrial Use

◆H Series parallel-shaft helical gear reducers serve high power applications with nominal output torques reaching 900 kilonewton meters across frame sizes 23 to 32. Single stage efficiency exceeds 96.5 percent, with two and three stage variants remaining above 93 percent. How it works: input rotation transfers through precision ground helical gear stages on parallel shafts. This arrangement distributes tooth contact forces across wide gear faces, maintaining load capacity under continuous heavy duty cycles. H2, H3, and H4 configurations offer ratios from 6.3 to 400 to suit varied speed reduction requirements. Foot, flange, and shaft mounted variants with solid or hollow output shafts accept direct motor coupling or separate input shaft arrangements. H Series units drive water conservancy gate hoists, large conveyor systems, crane lifting mechanisms, and industrial processing machinery where high torque transmission at low output speeds is required.

▼Key Features

• ★ Stronger load-bearing capacity

• ★ More optimized configuration

• ★ Leading-edge technology

▼Specifications

▼HelmeDrive Gearboxes Exporting-H Series Parallel-Shaft Gear Reducer

▼H Series Parallel-Shaft Gear Reducers Typical Industrial Applications

�FAQ

Q 1: You’re investing in a conveyor or crusher gearbox. How do you know it won’t let you down?

A:

A cement plant in Indonesia once told us:“We need a gearbox that survives peak loads without us worrying every shift.”

Here’s what they—and you—can expect from HelmeDrive's H Series:

The Indonesian plant? Three years later, routine inspection showedzero gear wear. They haven’t touched the gearbox since installation.

Send us your load profile and duty cycle. We’ll size it right—no guesswork.

Q 2: What’s the real service life? And what maintenance actually matters?

A:

25,000 hoursis the design number. In plain terms: nearly three years of continuous running.

What makes it last:

· Case-hardened gears:Surface hardened for wear resistance, tough core for shock absorption.

· Bearings:oversized for heavy radial and axial loads.

· Grinding:precision finish cuts friction.

Maintenance that pays off:

· First oil change: 100–150 hours (flushes break-in debris)

· Then: once a year or every 2,000–3,000 hours

A mining operation in Brazil ran H Series gearboxes on a crusher feed conveyor for four years. Oil analysis last year showed wear particles still well below alarm levels. They’re planning another two years before first overhaul.

For heavy-duty applications, we can set up a simple oil analysis schedule to catch issues early.

Q 3: What’s the most common cause of unexpected downtime in conveyors? (And how to avoid it.)

A:

Improper gearbox selection. Usually one of three things:

· Undersized for peak loads

· Overlooked thermal limits

· Missing backstop on inclined conveyors

H Series eliminates each risk:

A South African port had repeated belt reversals on their ship loader conveyor during power fluctuations. Each reversal meant 2–3 hours of cleanup. After installing H Series with backstops, reverse rotation stopped completely. They now save over150 hours of unplanned downtime annually.

Share your application details—we’ll run thermal and mechanical checks before quoting.

      📬shawn.zhu@helmedrive.com 

H Series Helical Gear Speed Reducer - Selection Guide

★Introduction

The HelmeDrive H Series is a parallel shaft helical gear speed reducer for industrial applications. It includes two-stage H2, three-stage H3, and four-stage H4 configurations. The series is selected using the nominal power rating, actual ratio, service factors, peak torque check, thermal power check, radial load check, mounting position, and lubrication requirements. All data must come from the corresponding manual.

1. Product Overview

● Gear design is based on infinite life according to the manual. This is a design reference value, not a warranty or actual operating guarantee.

● When service factor S.F. >= 1.4, bearing life is stated as >50,000 h in the manual. When S.F. >= 1.6, all bearing life is stated as >100,000 h in the manual. These are design reference values, not a warranty or actual operating guarantee.

● Noise values in the manual: frame sizes below 14 are <=85 dB; other sizes do not exceed 90 dB.

● Efficiency values in the manual: helical gear pair up to 98.5%.

● Nominal output torque and nominal input power ratings are given in the manual tables for each frame size and ratio. Select the exact value from the nominal output torque table and nominal power rating table for the selected size and ratio.

2. Application Scope

The H Series is selected using the working machine factor f1 from the manual. The following table summarizes typical application sectors and driven machines listed in the manual. The actual f1 must be taken from the manual according to the driven machine and daily operating hours.

● Applications not listed in the manual require consultation with HelmeDrive. Do not assume a service factor without a direct basis.

● The application must remain within the scope of the manual. Special applications, non-standard mounting, or extreme environments require confirmation.

3. Model Designation

The model designation contains the following information:

● Type: H = parallel shaft helical gear unit.

● Number of stages: 2, 3, or 4.

● Frame size: 04, 05, ... 23, 24.

● Output shaft form: S = solid shaft; H = hollow shaft; D = hollow shaft for shrink disk. The shrink disk connection is a friction-locked connection that eliminates the play common with keyed shafts.

● Mounting: H = horizontal mounting; M = horizontal mounting without feet; V = vertical mounting.

● Input shaft version: 0 = standard version; 1 = reinforced version.

● Nominal ratio.

● Design or arrangement: A, B, C, D, ... H, I.

● Additional information.

Example structure: H 3 09 S H 1 - 63 - C - ...

● The order must also specify cooling, lubrication, backstop, output shaft rotation direction, and any non-standard shaft or mounting requirements.

● When a backstop is required, specify it and provide the output shaft rotation direction as viewed facing the output shaft.

● For non-standard input or output shaft ends, or for wall mounting or inclined mounting, provide a drawing and consult HelmeDrive.

4. Operating Conditions

The gear unit is delivered ready for operation but without oil filling. Read the operating instructions before commissioning.

◆ Oil quantity values in the manual are guide values. The exact quantity depends on the marks on the oil dipstick.

◆ Oil viscosity must correspond to the data on the name plate.

◆ Only approved lubricants may be used.

◆ The gear unit is supplied with radial shaft seals. Other sealing variants require consultation.

◆ Direction of rotation refers to the input shaft d1.

◆ For outdoor installation, avoid direct sunlight and provide adequate protection.

◆ Foundation bolts must be at least property class 8.8.

◆ Ambient temperature correction factors are provided in the manual for 20°C to 50°C. For temperatures outside this range, consult HelmeDrive.

◆ Rating data cover several input speeds, such as 1800, 1500, 1200, and 1000 r/min, depending on size and stage. Confirm the applicable input speed for the prime mover.

5. Selection Procedure

①Determine the gear unit type: H for parallel shaft.

②Calculate the required transmission ratio: i = n1 / n2.

③Determine the nominal ratio iN and stage count from the ratio range.

④Select the frame size by one of the following methods:

◢ By torque: T2N >= f1 × f2 × T2.

◢ By working machine shaft power: T2N >= f1 × f2 × T2 = f1 × f2 × 9550 × P2 / n2.

◢ By prime mover power: P1N >= f1 × f2 × P1 = f1 × f2 × Pm / fm.

⑤Preliminary selection: type + frame size + number of stages + nominal ratio.

⑥Check peak torque or overload:

◢ T2N >= T2A × f3, or

◢ P1N >= P1A × f3.

⑦Check actual ratio. The actual ratio may differ from the nominal ratio. Verify whether the output speed tolerance is acceptable.

⑧Check thermal power and cooling:

◢ Natural cooling: Pc = PGA × f4 × f8.

◢ Fan cooling: Pc = PGB × f4 × f8.

◢ The check condition is Pc > P1 or Pc >= P2.

⑨Check additional forces on the output shaft. Use FRZ2 = FR2 × k. For frame sizes >=19, special designs, or input shaft radial loads, consult HelmeDrive.

⑩Confirm mounting position: H, M, or V.

⑪Confirm lubrication: immersion or splash lubrication is standard; forced lubrication is available on request.

⑫Confirm accessories such as backstop, heater, sensors, and other options.

6. Service Factor

6.1 Working Machine Factor f1

Select f1 according to the driven machine and daily operating hours. The following table gives representative values. The complete f1 table is given in the corresponding manual. For driven machines not listed, select f1 from the complete f1 table or consult HelmeDrive.

■  When actual application experience differs from the listed f1 values, use the application experience as the basis. Consult HelmeDrive for confirmation.

6.2 Prime Mover Factor f2

6.3 Peak Torque Factor f3

7. Safety Factor

Not specified in the manual; consult HelmeDrive.

8. Thermal Power Correction Factors

8.1 Ambient Temperature Factor f4

8.2 Oil Supply Factor f8

◆ Thermal power check: Pc = PGA × f4 × f8 for natural cooling; Pc = PGB × f4 × f8 for fan cooling.

◆ PGA is the thermal power capability without cooling measures.

◆ PGB is the thermal power capability with cooling fan.

◆ Thermal power tables cover H2 frame sizes 04–18, H3 frame sizes 05–18, and H4 frame sizes 07–18.

◆ For frame sizes >=19, thermal power data require consultation with HelmeDrive.

9. Permissible Radial Load on Shaft Extension

◆ The output shaft can accept a limited additional radial force. The permissible value depends on type, design, frame size, and distance Z from the shaft shoulder.

◆ Use FRZ2 = FR2 × k.

◆ FR2 is the recommended additional radial force. k is the force factor depending on distance Z.

◆ The calculation in the manual applies only to the output shaft and for f1 = 1.2. When f1 > 1.2, the permissible value may be larger. Consult HelmeDrive.

◆ For designs E, F, and I, consult HelmeDrive.For frame sizes >=19, or for radial load on the input shaft d1, consult HelmeDrive.

◆ Exact FR2 and k values are provided in the manual tables. Final selection must be confirmed by HelmeDrive.

10. Backstop and Lubrication Notes

◆ When a backstop is required, specify it in the order and provide the output shaft rotation direction as viewed facing the output shaft.

◆ Standard lubrication is immersion or splash lubrication.

◆ Forced lubrication with an oil pump or electric pump is available when required by structure or selection.

◆ For high-power continuous duty, high ambient temperature, or special operating conditions, consult HelmeDrive for lubrication and cooling.

◆ The gear unit is delivered without oil filling. Fill with the approved lubricant and quantity according to the oil dipstick and name plate.

11. Selection Example (Non-specific Customer Case)

Selection reference (non-specific customer case):

A driven machine requires output torque T2 = 12,000 N·m, output speed n2 = 30 r/min, input speed n1 = 1500 r/min, horizontal mounting, and ambient temperature 35°C.

■ Calculate ratio: i = n1 / n2 = 1500 / 30 = 50.

■ Calculate required power: P2 = T2 × n2 / 9550 = 12,000 × 30 / 9550 = 37.7 kW.

■ Select H3 because ratio 50 falls within the H3 nominal ratio range 22.4–100.

■ Apply f1, f2, f3, f4, and f8 according to the actual duty.

■ Select the frame size so that T2N >= f1 × f2 × T2 and P1N >= f1 × f2 × P1.

■ Check peak torque: T2N >= T2A × f3.

■ Check thermal power: Pc = PGA × f4 × f8 or Pc = PGB × f4 × f8.

■ Check radial load: FRZ2 = FR2 × k.

■ Confirm mounting, lubrication, and accessories.

Actual selection must be verified with complete duty parameters. Consult HelmeDrive for final confirmation.

12. �FAQ

Q1: How do I calculate the required output torque?
A1: Calculate T2 = 9550 × P2 / n2, where P2 is power in kW and n2 is output speed in r/min. Then apply the correct service factors and compare with the nominal output torque rating. Consult HelmeDrive for final confirmation.

Q2: How do I determine the correct ratio and stage count?
A2: Calculate i = n1 / n2. Select H2, H3, or H4 according to the nominal ratio range and actual ratio table. Verify the output speed tolerance.

Q3: Which mounting positions are available?
A3: H for horizontal, M for horizontal without feet, and V for vertical. Other mounting orientations require consultation for oil level and lubrication.

Q4: How does ambient temperature affect selection?
A4: Ambient temperature affects thermal power through factor f4. The manual provides f4 values from 20°C to 50°C. For temperatures outside this range, consult HelmeDrive.

Q5: How much radial load can the output shaft withstand?
A5: Use FRZ2 = FR2 × k. FR2 depends on type, design, and frame size. k depends on distance Z. For frame sizes >=19 or special designs, consult HelmeDrive.

Q6: What lubrication is standard?
A6: Immersion or splash lubrication is standard. Forced lubrication is available on request for high-power continuous duty or special conditions.

Q7: Can a backstop be supplied?
A7: Yes, when specified in the order. Provide the output shaft rotation direction as viewed facing the output shaft. Consult HelmeDrive for selection.

13. Before You Buy

■ Confirm the gear unit type: H parallel shaft.

■ Confirm the required ratio, stage count, and actual ratio tolerance.

■ Confirm the required output torque, power, and peak torque.

■ Apply f1, f2, f3, f4, and f8 correctly.

■ Check thermal power and cooling requirements.

■ Check output shaft radial load and any input shaft radial load.

■ Confirm mounting position and lubrication.

■ Confirm backstop, heater, sensors, and other accessories.

■ Provide complete duty data: power, speed, ratio, daily hours, load type, ambient temperature, radial force, and mounting position.

■ For any missing data, non-standard condition, or frame size >=19, consult HelmeDrive.

14. Conclusion

The HelmeDrive H Series provides a modular selection system for parallel shaft industrial gear units. Correct selection requires the nominal power rating, actual ratio, service factors, peak torque check, thermal power check, radial load check, and confirmed mounting and lubrication. All data must come from the corresponding manual. For final sizing, special conditions, or data outside the manual, consult HelmeDrive technical department.

📬shawn.zhu@helmedrive.com