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Cylindrical Gear Reducers ZDY ZLY ZSY Series | Standardized Modular Design

Name: Cylindrical Gear Reducers ZDY ZLY ZSY Series | Standardized Modular Design
Brand: HUAKE

The ZDY/ZLY/ZSY series cylindrical gear units are hard-tooth-surface reducers adopting external meshing involute helical gear transmission. Manufactured in accordance with relevant national standards (such as JB/T8853—2001), they cover three basic series: single-stage (ZDY), two-stage (ZLY), and three-stage (ZSY), which can meet different requirements for transmission ratio and power. Relying on high-quality material technology, stable transmission performance, and wide adaptability, this series of gear units has become a core transmission component in many industrial fields such as metallurgy, mining, building materials, and chemical industry. While reducing speed and amplifying torque, they can ensure the reliable operation of equipment. The following is a comprehensive and detailed introduction to this series of gear units.

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Basic Structure

The structure of ZDY/ZLY/ZSY series cylindrical gear units follows standardized design, with good interchangeability of core components. The whole unit consists of four major parts: transmission mechanism, support mechanism, box body, and accessories. Each part cooperates closely to realize the smooth transmission of power and speed reduction function.

Cylindrical Gear Reducers ZDY ZLY ZSY Series | Standardized Modular Design 2

Transmission Mechanism:

The core is a cylindrical gear set. The ZDY series contains a pair of meshing gears (single-stage transmission), the ZLY series contains two pairs of meshing gears (two-stage transmission), and the ZSY series contains three pairs of meshing gears (three-stage transmission). All gears are made of high-strength low-carbon alloy steel through carburizing and quenching, with tooth surface hardness reaching HRC54-62, and are processed by gear grinding technology, resulting in excellent transmission accuracy and contact effect. Among them, the driving gear is mostly integrated with the input shaft (gear shaft), and the driven gear is connected to the output shaft or intermediate shaft through a flat key to realize power transmission.

Cylindrical Gear Reducers ZDY ZLY ZSY Series | Standardized Modular Design 3

Support Mechanism:

It mainly includes input shaft, output shaft, intermediate shaft (for ZLY/ZSY series), and rolling bearings. The shafting adopts a stepped design, taking into account the requirements of part assembly and disassembly, positioning and fixing, and processing technology. The fit between the journal and the bearing ensures rotation accuracy; deep groove ball bearings (for spur gear transmission without axial force) or tapered roller bearings are mostly used for the bearings. According to the shafting span and working temperature, different fixing forms such as fixed at both ends, fixed at one end and floating at the other end are adopted to avoid axial movement of the shaft during operation.

Box Body and Connecting Parts:

The box body is divided into upper box body and lower box body, usually made of cast iron casting or steel plate welding, providing closed protection and installation reference for internal components, and having sufficient rigidity to bear transmission load. The box body is fixed by bolt connection, and the positioning pin ensures the assembly accuracy of the upper and lower box bodies; the parts on the shaft are axially positioned through shaft shoulders, sleeves, adjusting rings, etc., to ensure the accurate meshing position of the gears.

Auxiliary Accessories:

•Including breather, oil level indicator, oil drain plug, inspection hole cover plate, cover lifting screw, and seals. The breather balances the air pressure inside and outside the box body, the oil level indicator is convenient for checking the lubricating oil level, and the oil drain plug facilitates the replacement of lubricating oil; the seal (such as felt ring) is used for the seal of the shaft extension end to prevent dust from entering and lubricating oil from leaking; the oil baffle can avoid the lubricating oil splashed by the gear diluting the bearing grease and ensure the lubrication effect.

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Industrial gear box (2)

Industrial gearbox (1)

Industrial gearbox (11)

Industrial gear box (1)

Industrial gearbox (15)

Working Principle

The core working principle of the ZDY/ZLY/ZSY series cylindrical gear units is to use the tooth number difference of gear meshing to realize speed reduction and torque amplification. The transmission process of gear units with different stages is slightly different, but essentially follows the law of involute gear transmission. The specific working process is as follows:

Power Input: A high-speed power source such as a motor is connected to the input shaft of the gear unit, driving the driving gear (pinion) on the input shaft to rotate at high speed. The driving gear has fewer teeth and has the characteristics of high speed and low torque, providing basic power for subsequent speed reduction transmission.
Meshing Speed Reduction: The driving gear drives the driven gear (gear wheel) to rotate through tooth surface meshing. Since the number of teeth of the driven gear is more than that of the driving gear, according to the gear transmission ratio formula (transmission ratio = number of teeth of driven gear / number of teeth of driving gear), the speed of the driven gear will be lower than that of the driving gear, and the torque will be amplified in inverse proportion to the transmission ratio. Among them, the ZDY series completes one speed reduction through single-pair gear meshing, which is suitable for scenarios with a transmission ratio of 3~5; the ZLY series realizes secondary speed reduction through two-stage gear meshing, with a transmission ratio range of 8~40; the ZSY series completes three speed reductions through three-stage gear meshing, which can obtain a larger transmission ratio.
Power Output: After single-stage or multi-stage gear speed reduction, the final driven gear transmits the low-speed and high-torque rotational motion to the output shaft, which is then connected to the working machine to drive it to complete various operations. The intermediate shaft of the ZLY/ZSY series undertakes the role of transmitting power between gears at all stages, ensuring the smooth connection of the speed reduction process.

Core Features

As mainstream products of hard-tooth-surface reducers, the ZDY/ZLY/ZSY series cylindrical gear units have significant performance advantages compared with traditional soft-tooth-surface reducers and other types of reducers. The specific features are as follows:

High Transmission Efficiency: The hard-tooth-surface gears processed by gear grinding technology have small meshing clearance and low sliding friction loss, showing excellent transmission efficiency. Among them, the transmission efficiency of single-stage (ZDY) can reach 98%, two-stage (ZLY) can reach 96%, and three-stage (ZSY) can reach 94%, which is higher than most traditional reducers, effectively saving energy and improving the overall operating efficiency of equipment.
Strong Load-Bearing Capacity and Long Service Life: The gears are made of high-strength low-carbon alloy steel. After carburizing and quenching, the tooth surface has high hardness and good wear resistance. Combined with the load distribution characteristics of multi-tooth meshing, it can bear large radial and axial loads. Compared with soft-tooth-surface reducers, its service life is greatly extended, and it can adapt to heavy-load and continuous-operation industrial scenarios.
Smooth Transmission and Low Noise: The core transmission adopts a helical gear structure. Compared with spur gears, helical gears have larger contact area and smaller impact during meshing, resulting in smoother transmission process and significantly lower operating noise; at the same time, the standardized structural design and high-precision processing technology further improve the transmission stability.
Standardized Structure and Good Interchangeability: Main parameters such as center distance and nominal transmission ratio are optimally designed and produced in accordance with unified national standards. The core components have good interchangeability, which is convenient for later maintenance and spare parts replacement, reducing equipment operation and maintenance costs.
Compact Structure and Wide Adaptability: Adopting a parallel shaft transmission layout, the structure is compact, with small volume and light weight under the same torque capacity, which is convenient for installation in various industrial equipment; it can adapt to working conditions where the input speed is not greater than 1500 r/min, the circumferential speed of gear transmission is not greater than 20 m/s, the working environment temperature range is -40℃~45℃, and it supports operation in both positive and negative directions.

Application Fields

With stable transmission performance, strong load-bearing capacity, and wide adaptability to working conditions, the ZDY/ZLY/ZSY series cylindrical gear units are widely used in many industrial fields and have become core transmission components of various mechanical equipment. The main application scenarios are as follows:

Cylindrical Gear Reducers ZDY ZLY ZSY Series | Standardized Modular Design 11

Metallurgy and Mining Field:

Used in the transmission systems of metallurgical blast furnaces, steel rolling equipment, mining crushers, conveyors and other equipment, it can bear heavy loads and impact loads, operate stably in harsh working environments, and ensure the continuous progress of metallurgical and mining operations.

Cylindrical Gear Reducers ZDY ZLY ZSY Series | Standardized Modular Design 12

Building Materials and Chemical Field:

Suitable for conveyors and mixers in cement production lines, reactors and material transfer pumps in the chemical industry and other equipment, it can meet the transmission needs in high-dust and corrosive environments, ensuring the smooth and efficient production process.

Hoisting and Transportation Field:

Applied to cranes, winches, belt conveyors, hoists and other equipment, it realizes the stable lifting of heavy objects and efficient transportation of materials by amplifying torque, and is a core guarantee for the reliable operation of hoisting and transportation equipment.

Textile and Papermaking Field:

Used in the transmission systems of textile machines and papermaking machines, relying on the advantages of stable transmission characteristics and low noise, it avoids interference with textile and papermaking processes and ensures the stability of product quality.

Construction Machinery and Energy Field:

Suitable for auxiliary transmission systems of various construction machinery (such as loaders, excavators), as well as related equipment in the new energy and power industries (such as auxiliary transmission of small wind turbines, power transmission equipment), meeting the power transmission needs under different working conditions.

Light Industry and Medical Field:

Used in packaging machines and printing machines in the light industry, and some auxiliary equipment in the medical industry, relying on standardized structure and reliable performance, it provides transmission support for the precise operation of such equipment.

Selection Parameter Reference Table

The following is a reference for the core selection parameters of the ZDY/ZLY/ZSY series cylindrical gear units. Specific parameters can be adjusted according to actual working conditions and manufacturer's product manuals:

Series Model	Transmission Stages	Nominal Transmission Ratio Range	Input Speed (r/min)	Rated Power Range (kW)	Center Distance Range (mm)	Transmission Efficiency	Applicable Working Condition Characteristics
ZDY	Single-stage	3.15~5.6	≤1500	0.75~160	80~400	≥98%	Low transmission ratio, high-speed input, suitable for light to medium load scenarios requiring high transmission efficiency
ZLY	Two-stage	8~40	≤1500	0.75~315	125~630	≥96%	Medium transmission ratio, balancing efficiency and load-bearing capacity, suitable for most general industrial transmission scenarios
ZSY	Three-stage	40~250	≤1500	0.75~400	160~800	≥94%	High transmission ratio, high torque output, suitable for heavy-load and low-speed operation industrial equipment

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