Product Overview: Precision Speed Control
The fundamental purpose of a helical gear reducer is to take the high-speed, low-torque output of an electric motor and transform it into low-speed, high-torque power suitable for heavy industrial machinery. However, specifying the wrong reduction ratio will result in a conveyor that runs too fast or a mixer that lacks the torque to rotate. At Zhejiang Tanhon, we manufacture a vast range of highly precise helical gear ratios. By accurately calculating your required machine RPM and matching it against a standard 4-pole or 6-pole AC motor, we supply customized powertrain assemblies that deliver the exact speed and massive torque your production line demands.
Technical Parameters: Understanding Ratios
| Parameter | Definition / Formula | Typical Industrial Example |
|---|---|---|
| Reduction Ratio (i) | Motor RPM 梅 Required Machine RPM | 1440 梅 72 = Ratio of 20:1 (i=20) |
| Input Speed (n1) | Speed of the driving electric motor | 1440 RPM (Standard 4-pole 50Hz motor) |
| Output Speed (n2) | Final speed of the gearbox output shaft | 72 RPM (Ideal for standard conveyors) |
| Output Torque | Motor Torque 脳 Ratio (i) 脳 Efficiency | Multiplies motor torque by nearly 20 times |
| Stage Configuration | Number of internal gear pairs | 2-stage (up to i=30), 3-stage (up to i=200+) |
Working Principle of Gear Ratios
A gear ratio is simply the mathematical relationship between the number of teeth on the driving gear (input) and the driven gear (output). If a small input gear with 10 teeth drives a larger gear with 40 teeth, the larger gear will turn exactly one time for every four turns of the small gear. This creates a 4:1 reduction ratio. The speed is divided by 4, but due to the laws of physics, the rotational force (torque) is multiplied by 4 (minus a tiny fraction lost to friction). By linking multiple sets of these gears together inside our cast iron housings (multi-stage gearing), Tanhon can achieve massive reduction ratios, turning a 1440 RPM motor into an unstoppable 1 RPM output.
Core Advantages of Precise Ratio Selection
1 Maximize Motor Efficiency
Choosing the perfect internal gear ratio allows your electric motor to run at its optimal base speed (e.g., 50Hz/60Hz), drawing the least amount of amps.
2 Exact Synchronization
In automated packaging lines, precision helical ratios ensure that multiple distinct conveyors move at the exact same linear speed without bottle-necking.
3 Higher Torque Delivery
By relying on the gearbox for speed reduction rather than a VFD alone, you physically multiply the torque, allowing you to downsize your motor.
4 Eliminate External Belts
Building the exact ratio into the gearbox removes the need for external pulley reductions, eliminating radial loads and saving physical space.
5 Prevent Overheating
Running an electric motor too slowly via a VFD causes it to overheat. A high gearbox ratio allows the motor to spin fast and stay cool while delivering slow output.
Structure & Craftsmanship
Zhejiang Tanhon achieves unparalleled ratio flexibility through a highly modular internal architecture. Our R, F, and K series reducers utilize optimized 20CrMnTi gearsets that can be configured in 2-stage or 3-stage layouts within the same compact HT250 cast iron housing. For applications requiring ultra-slow speeds (like water treatment clarifiers), we can bolt two separate gearbox housings together in a tandem configuration, creating 5-stage or 6-stage reductions capable of achieving ratios exceeding 28,000:1 with incredibly smooth power delivery.
Brand Compatibility for Powertrain Upgrades
Disclaimer: We mention these brands for compatibility purposes only. Ever Power provides premium alternative replacements, not counterfeit products.
| Global Brand | Our Support Capability | Advantage of Choosing Zhejiang Tanhon |
|---|---|---|
| SEW Eurodrive | Exact Ratio Matching | We perfectly replicate the exact nominal and exact ratio (e.g., i=24.57) of SEW units to guarantee line synchronization. |
| Flender (Siemens) | Heavy Duty Recalculation | If an old machine is being sped up or slowed down, we engineer a new replacement ratio that fits the same footprint. |
| Nord Drivesystems | Motor Integration | We supply the gearhead and the matched 4-pole or 6-pole motor as a unified package to guarantee the final output RPM. |
Engineer Field Notes: Case Studies
1. Aggregate Belt Conveyor – South Africa
Application: Heavy inclined stone conveyor requiring a very specific belt speed to prevent spillage.
Engineer Evaluation: The client was trying to achieve 45 RPM using an old gearbox with a ratio of 20:1 by intentionally starving the AC motor of voltage, which caused the motor to constantly overheat. We eliminated this dangerous setup by supplying a Tanhon F-Series reducer with a precise 32.4:1 ratio. The motor was returned to full voltage (1440 RPM), running perfectly cool while delivering the exact 44.4 RPM required at the output.
2. Food Packaging Indexer – UK
Application: Dual parallel conveyors pushing boxes to a taping machine.
Engineer Evaluation: The two conveyors were powered by different brands of gearboxes. Although both claimed to be ’30:1′, one was exactly 29.8:1 and the other was 30.5:1. Over the length of the line, this slight difference caused the boxes to twist and jam. We supplied two identical Tanhon K-Series units with mathematically identical gearsets, perfectly synchronizing the line permanently.
Call to Action
Do not guess your speeds and risk stalling your production. Let the engineering experts at Zhejiang Tanhon calculate the perfect reduction ratio for your application. We provide integrated motor and helical gearbox packages that guarantee precise output RPM and massive torque.
Request a Free Ratio Calculation View Our Gearbox Catalog
Frequently Asked Questions (FAQ)
Q1: Does a higher reduction ratio mean a stronger gearbox?
A1: Yes, up to the physical limit of the gears. A higher ratio multiplies the motor’s torque significantly. However, if the multiplied torque exceeds the physical strength (Maximum Output Torque rating) of the gearbox casing and shafts, you must step up to a larger physical frame size.
Q2: What is the difference between a Nominal Ratio and an Exact Ratio?
A2: A Nominal Ratio is a rounded marketing number (e.g., 20:1). The Exact Ratio is the true mathematical gear division (e.g., 19.87:1). When matching existing machinery or synchronizing conveyors, you must always order based on the Exact Ratio to prevent speed mismatch.
