Category: Gearboxes and reducers

Gearbox wear is one of the most frequently asked questions by GM's technical staff. Regarding wear issues in planetary gearboxes, hardened gearboxes, and gear reducers, GM believes that proper oil changes and after-sales service are effective preventative measures. Taking gearbox oil changes as an example: the first oil change should be performed after 200-300 hours of operation. In subsequent use, the oil quality should be checked regularly, and any oil contaminated with impurities or deteriorated should be replaced promptly. Generally, for gearboxes operating continuously for extended periods, the oil should be changed every 5000 hours or annually. For gearboxes that have been out of service for a long time, the oil should also be changed before restarting. Gearboxes should use oil of the same brand as the original manufacturer's oil; mixing with oils of different brands is prohibited. Oils of the same brand but different viscosities can be mixed. When changing the oil, wait until the gearbox has cooled down to a point where there is no risk of combustion, but it should still be kept warm, as the oil will…

How to install a shaft-mounted geared motor. This section primarily discusses three aspects: the installation relationship between the shaft-mounted geared motor and the working machine, the connection between the shaft-mounted geared motor and the working machine, and the installation of the reaction torque bracket. Below, Shanghai Gearbox will describe the installation process in detail. I. Installation Relationship between Shaft-Mounted Geared Motor and Working Machine: To prevent deflection of the working machine's main shaft and additional forces on the gearbox bearings, the distance between the gearbox and the working machine should be as small as possible, ideally 5-10mm, without affecting normal operation. II. Connection between Shaft-Mounted Geared Motor and Working Machine: The gearbox is directly mounted on the working machine's main shaft. When the gearbox operates, the reaction torque acting on the gearbox housing is balanced by a reaction torque bracket mounted on the gearbox housing or by other methods. The gearbox is directly fitted to the working machine, with the other end connected to a fixed bracket. III. Installation of the Reaction Torque Bracket: The reaction torque bracket should be installed on the working machine facing the gearbox…

For a long time, my country's domestically produced cycloidal pinwheel reducers and gear reducers have become increasingly mature. Reducers are the most commonly used transmission equipment in the machinery industry. The new type of reducer has upgraded its power and transmission connection from traditional shaft connectors to specially designed spline connections using imported and assimilated foreign technology. The concentricity, parallelism, and precision of its core components have reached world-leading levels. Compared with similar domestic equipment, this new equipment saves one-third of metal materials, reduces volume by one-third, lowers noise by more than 100 decibels, increases efficiency by more than 60%, and costs only one-third of similar equipment on the international market. Reducers are widely used transmission and speed regulation devices in the major equipment manufacturing industry, and are widely used in many fields of the national economy, including modern scientific research, national defense, transportation, metallurgy, chemical industry, and infrastructure construction. Cycloidal pinwheel reducers and helical gear reducers are mostly general-purpose products, and people often…

What are the causes of oil leakage in T-series steering gearboxes? 1. Inadequate structural design. During manufacturing, if the castings are not annealed or aged, internal stress will not be eliminated, inevitably leading to deformation and voids, resulting in leakage. 2. Pressure difference between internal and external parts. During operation, the moving parts generate heat due to friction, and the ambient temperature also affects the steering gearbox temperature. If there is no vent or the vent is blocked, the internal pressure gradually increases. The higher the internal temperature, the greater the pressure difference with the outside, causing lubricating oil to leak from the gaps under the pressure difference. 3. Excessive oil filling. During operation, the oil sump in the T-series steering gearbox is violently agitated, and lubricating oil splashes everywhere inside the machine. If too much oil is added, a large amount of lubricating oil accumulates at the shaft seals and mating surfaces, leading to leakage. 4. Inadequate shaft seal design. Poor contact between the journal and the seal causes the seal to fail quickly. 5. Lack of an oil return groove on the gearbox body. Lubricating oil…

Worm gear reducers consist of an input worm and an output worm wheel. Their characteristics include high torque transmission, high and large reduction ratios (ranging from 5 to 100 for single-stage transmissions), and non-coaxial input and output transmission mechanisms, making them difficult to use and resulting in the lowest transmission efficiency, not exceeding 60%. Because they are relative sliding friction transmissions, worm gear reducers have slightly lower stiffness values, and their transmission components are prone to wear and tear, leading to a short service life and temperature rise. Therefore, they have a limited allowable input speed (2,000 rpm), which restricts their application. Assisting servo motors in increasing torque: The development of servo motor technology, from high torque density to high power density, has increased speeds above 3000 rpm. This increased speed significantly improves the power density of servo motors. This means that whether a servo motor needs a speed reducer depends primarily on the application requirements and cost considerations…

Abnormal noise from a hardened gear reducer is definitely caused by an anomaly. After ruling out uneven placement, the remaining issue is an internal fault. Let's examine the causes and solutions one by one: I. Causes of Abnormal Noise from Hardened Gear Reducers ① Coupler Damage. When the coupler connecting to the hardened gear reducer is damaged due to oil leaks, loose screws, etc., it will cause vibration and noise. ② Loose Motor Screws. Similar to coupler malfunctions, when the motor vibrates for various reasons, it will transmit the vibration to the reducer, increasing the reducer noise. ③ Severe Bearing Wear; Gear Damage. Gear damage includes severe pitting on the tooth surface, large gear meshing clearance, severe gear tooth wear, and broken teeth. These conditions of gear wear can all cause noise due to excessive vibration. ④ Shaft Deformation and Imbalance. When the shaft's strength and hardness are below requirements or due to aging from long-term operation…

I. Environmental Conditions 1. The temperature rise measurement of the cycloidal pinwheel reducer should be conducted indoors, unaffected by external temperature. The indoor ambient temperature should be within the range of 5~40℃, and the indoor air should circulate freely; forced circulation is not permitted. 2. Temperature Measurement Point The temperature measurement point should be selected where the thermometer can contact the lubricating oil of the cycloidal pinwheel reducer. II. Thermometer Scale Value: 0.5℃ III. Measurement Method 1. Determination of Operating Temperature The temperature rise measurement of the reducer under test is generally carried out together with the load-bearing capacity and transmission power measurement of the reducer, but it can also be carried out independently. When the reducer under test meets the requirements, read the operating temperature of the reducer at the rated speed and rated input power. 2. Determination of Ambient Temperature Place the thermometer 1.5m away from the surface of the cycloidal pinwheel reducer under test. The height of the thermometer measuring point from the ground should be equal to the height of the reducer's axis. The placement of the thermometer should not be affected by external radiant heat or airflow…

The cycloidal pinwheel reducer can be divided into three parts: the input section, the reduction section, and the output section. The cycloidal pinwheel reducer has a double eccentric sleeve offset by 180° mounted on the input shaft. Two roller bearings, called swing arms, are mounted on the eccentric sleeve, forming an H-mechanism. The central holes of the two cycloidal wheels in the reducer serve as the raceways for the swing arm bearings on the eccentric sleeve. The cycloidal wheels mesh with a set of annularly arranged pin teeth on the pin gear, forming an internal meshing reduction mechanism with a tooth difference of one tooth. (To reduce friction, in reducers with small speed ratios, the pin teeth are fitted with pin tooth sleeves). When the input shaft of the cycloidal pinwheel reducer rotates one revolution with the eccentric sleeve, due to the characteristics of the tooth profile curve of the cycloidal wheels and the influence of the pin teeth on the pin gear, the motion of the cycloidal wheels becomes a planar motion involving both revolution and rotation. When the input shaft rotates one revolution clockwise, the eccentric sleeve also rotates one revolution, and the cycloidal wheels rotate in the opposite direction…

A cylindrical gear reducer is a power transmission mechanism that uses gears to reduce the rotational speed of a motor to a desired speed while obtaining a larger torque. Cylindrical gear reducers are relatively precise machines used to reduce speed and increase torque. The gears in a cylindrical gear reducer are carburized, hardened, and ground, resulting in high load-bearing capacity and low noise. They are mainly used in belt conveyors and various transport machinery, and can also be used in the transmission mechanisms of other general-purpose machinery. They offer advantages such as high load-bearing capacity, long service life, small size, high efficiency, and light weight, and are used in transmission devices where the input and output shafts are arranged perpendicularly.

Viscosity is an important physicochemical property of gear oil. Choosing the correct viscosity reduces internal friction, thereby reducing wear on the gear surfaces of the reducer, as well as transmission noise and vibration. So, what is the ideal viscosity for gear oil? This question still puzzles many users. Below, a reducer manufacturer will explain: 1. The viscosity of reducer lubricating oil is mainly achieved through base oil and viscosity index improvers. The viscosity of the base oil is related to its molecular structure and molecular weight; a higher average molecular weight results in higher viscosity. 2. A good viscosity index improver should have high viscosity-increasing ability, good shear stability, and excellent low-temperature performance and thermal oxidation stability. 3. For a given viscosity grade of lubricating oil, if unrefined base oil and a poor-quality viscosity index improver are used, although a certain viscosity standard can be achieved through blending, the viscosity-temperature properties, shear stability, and other properties will be poor, and the desired performance will not be achieved…

Judging the oil level while the reducer is running will result in a significant discrepancy with the actual oil level. It is recommended to measure the oil level and add the appropriate amount of worm gear reducer lubricating oil when the reducer is stopped. Reducer manufacturers usually provide instructions on the worm gear reducer oil level, recommending filling the oil level to 2/3 of the oil window. However, this is for a stopped state. Note: Do not add lubricating oil while the worm gear reducer is running. During operation, the internal gears or worm wheel rotate, causing the internal lubricating oil to work as well. Judging the oil level under these conditions could result in a full oil level, a level below 2/3 of the oil window, or even no lubricating oil at all. For new reducers, the oil should be changed after 300 hours of continuous operation, and then every 2500 hours thereafter. However, the oil quality should still be checked regularly during use. If the oil contains impurities…

Our factory's worm gear screw jacks have a high-speed shaft that can operate in both forward and reverse directions, with a speed not exceeding 1500 rpm. The operating environment temperature for the worm gear screw jack is 0℃-40℃. When the operating environment temperature is below 0℃, the lubricating oil must be preheated to 0℃ before starting. The axes of the high-speed and low-speed shafts of the worm gear screw jack must be concentric with the axes of the connecting parts, and the misalignment must not exceed the allowable value of the coupling used. Before officially using the installed worm gear screw jack, a load test is necessary. The load test should be conducted under no-load conditions; if no faults are found, loading should begin. The load test is divided into four stages: Stage 1 load is 25% of the rated load. Stage 2 load is 50% of the rated load. Stage 3 load is 75% of the rated load. Stage 4 load is [missing information]. The oil temperature during each stage of operation must not exceed 80℃. If it does, the machine should be stopped immediately for inspection and the cause determined…

There are two types of speed reducers: worm gear reducers and worm reducers. Ignoring other factors and only looking at the names, they seem to differ only in the word "worm." However, from a professional perspective, what are the similarities and differences between these two types of speed reducers? Let's explore how to distinguish between worm gear reducers and worm reducers. Objectively speaking, the differences between worm gear reducers and worm reducers are not significant; in some cases, people might even forget the difference. However, subjectively, we must pay attention to the principles, structure, components, and key parts of worm gear reducers and worm wheel reducers. The most crucial point is what the driving component is. For worm reducers, the driving component is the worm. Since the worm is the driving component, this is a detail that needs attention. Similarly, worm transmission…

Technical Parameters: 1. Speed ​​Ratio Range: 1.25-450 2. Torque Range: 2.6-900kN 3. Power Range: 4-5000kW Features of HB Series Standard Industrial Gear Reducers: 1. H and B high-power gear reducers adopt a universal design scheme and can be modified into professional-grade gearboxes according to customer needs. 2. Achieves universal housing design for parallel shafts, right-angle shafts, vertical, and horizontal configurations, reducing the variety of parts and increasing specifications. 3. Utilizes a sound-absorbing housing structure, a large housing surface area, a large fan, and advanced grinding technology for both cylindrical and spiral bevel gears, improving overall temperature rise, noise reduction, operational reliability, and power transmission. 4. Input Method: Motor connection flange, shaft input. 5. Output Method: Solid shaft with key, hollow shaft with key, hollow shaft with expansion disc, hollow shaft with spline connection, solid shaft with spline connection, and flange connection…

A geared motor is an integrated unit combining a speed reducer and a motor. This type of integrated unit is also commonly referred to as a geared motor or geared motor assembly. It is typically assembled and supplied as a complete set by specialized speed reducer manufacturers. Geared motors are widely used in the steel and machinery industries. The advantages of using geared motors include simplified design and space saving. 1. Geared motors are manufactured in accordance with international technical requirements, possessing high technological content. 2. They save space, are reliable and durable, have high overload capacity, and can reach power of over 95KW. 3. They have low energy consumption, superior performance, and a speed reducer efficiency of over 95%. 4. They have low vibration, low noise, and high energy efficiency, using high-quality steel materials, a rigid cast iron housing, and gear surfaces that undergo high-frequency heat treatment. 5. Precision machining ensures positioning accuracy. All these factors contribute to the geared motor assembly. Geared motors, when combined with various motors, form a mechatronic system, fully guaranteeing the quality of the product…

With the increasing use of screw jacks in my country's industry and continuous improvements driven by technological advancements, worm gear screw jack reducers have also provided a foundation for better use of lifting platforms. Below, we'll understand the control system of a screw jack. A worm gear screw jack platform uses a worm gear reducer, and its control system is broadly divided into two stages: The first stage is a hydraulic control system with a hydraulic integrated block without a hand pump. During use, the return valve knob must be tightened clockwise, the manual directional valve handle pulled to the "neutral" position, the motor (or diesel engine) started to activate the system, and then the directional handle pulled to the "lift" position. The hydraulic jack rises, and when it reaches the desired height, the directional handle is pushed back to the "neutral" position to stop the hydraulic jack from rising. Simultaneously…

Speed ​​reducers are generally used in low-speed, high-torque transmission equipment. They reduce the speed of electric motors, internal combustion engines, or other high-speed power sources by meshing a small gear on the input shaft with a large gear on the output shaft. Below is an introduction to the characteristics of various speed reducers: Worm gear reducers are characterized by their reverse self-locking function, large reduction ratio, and the input and output shafts are not on the same axis or plane. However, they are generally large in size, with low transmission efficiency and low precision. Harmonic reducers utilize the controllable elastic deformation of flexible elements to transmit motion and power. They are small in size and highly precise, but their disadvantages include limited lifespan of the flexible gear, poor impact resistance, and lower rigidity compared to metal parts. The input speed cannot be too high. Planetary reducers have advantages such as a compact structure, small backlash, high precision, long service life, and the ability to achieve a large rated output torque. However, the price…

How to handle the wear and tear and cleaning of a speed reducer? 1. Wear of the reducer housing and bearing box. 2. Repair of wear in the bearing chamber of the reducer housing in a coal mining machine. Wear on the reducer gear shaft diameter. During long-term operation, the reducer shaft often experiences wear and keyway damage. Traditional methods are difficult to solve on-site and require external repair; moreover, metal-to-metal repairs cannot change the hard-on-hard fit, which, under the combined action of various forces, will still cause further wear. Operation should be smooth, without impact, vibration, noise, or oil leakage. Any abnormalities should be addressed promptly. After installation, the accuracy of the installation position and the reliability of the fasteners should be checked in sequence. The reducer should be able to rotate freely after installation. The oil level should match the installation position. Open the oil level plug, breather, and drain plug. Oil replacement…