Worm gear reducer_stepless speed changer-Ever-Power Worm Gear Reducer Co., Ltd.

Characteristic function
Heat and oil leakage
Worm gear wear
Helical gear wear
Bearing damage

Features of worm gear reducer
1. The mechanical structure is compact, the volume is light and the appearance is small and efficient;
2. Good heat exchange performance and fast heat dissipation;
3. Easy to install, flexible and light, superior performance, easy to maintain and repair;
4. Stable operation, low noise, and durable;
5. Strong usability, high safety and reliability;

The functions of the worm gear reducer are:
1. Reduce the speed and increase the output torque at the same time. The torque output ratio is the motor output multiplied by the reduction ratio, but it should be noted that the rated torque of the reducer cannot be exceeded.
2. Deceleration reduces the inertia of the load at the same time, and the reduction in inertia is the square of the reduction ratio.You can see that a general motor has an inertia value.

Heat and oil leakage
In order to improve efficiency, worm gear reducers generally use non-ferrous metals as worm wheels and harder steel as worms. Because it is a sliding friction transmission, high heat will be generated during operation, which makes the parts and seals of the reducer There is a difference in thermal expansion between them, which creates a gap in each mating surface, and the oil becomes thinner due to the increase in temperature, which is easy to cause leakage.There are four main reasons. One is whether the combination of materials is reasonable, the second is the surface quality of the meshing friction surface, the third is the choice of lubricating oil, whether the amount of addition is correct, and the fourth is the assembly quality and use environment.
Solution
Ensure assembly quality.You can buy or make some special tools. When disassembling and installing the parts of the reducer, try to avoid hitting with other tools such as hammers; when replacing gears and worm gears, try to use original parts and replace them in pairs; when assembling the output shaft, pay attention Tolerance matching; anti-sticking agent or red lead oil should be used to protect the hollow shaft to prevent wear, rust, or dirt on the mating area, which is difficult to disassemble during maintenance.

Worm gear wear
The worm wheel is generally made of tin bronze, and the matched worm material is generally hardened with 45 steel to HRC45-55, and 40C: hardened HRC50-55 is commonly used, and it is ground to a roughness of RaO. 8 fcm by a worm grinder. When the reducer is in normal operation, The worm is like a hardened "file" that keeps filing the worm wheel, causing wear and tear on the worm wheel.Generally speaking, this kind of wear is very slow. For example, some reducers in a certain factory can be used for more than 10 years.If the wear rate is fast, it is necessary to consider whether the selection of the reducer is correct, whether there is overload operation, the material of the worm gear, the assembly quality or the use environment and other reasons.
Solution
Selection of lubricants and additives.Worm gear reducers generally use 220# gear oil. For reducers with heavy loads, frequent starts, and poor use environments, some lubricating oil additives can be used to make the gear oil still adhere to the gear surface when the reducer stops running, forming protection Membrane to prevent heavy load, low speed, high torque and direct contact between metals when starting.The additives contain seal ring regulator and anti-leakage agent to keep the seal ring soft and elastic and effectively reduce lubricating oil leakage.

Helical gear wear
Generally, it occurs on the reducer installed vertically, mainly related to the amount of lubricant added and the choice of lubricant.When installed vertically, it is easy to cause insufficient lubricating oil. When the reducer stops running, the transmission gear between the motor and the reducer loses oil, and the gear does not get the proper lubrication protection, and it is not effective during startup or operation. The high lubrication causes mechanical wear and even damage.

Solution
Selection of the installation location of the reducer.Where the location permits, try not to use vertical installation.In vertical installation, the amount of lubricating oil added is much more than that in horizontal installation, which may easily cause heat generation and oil leakage of the reducer.

Bearing damage
When the reducer fails, even if the reduction box is well sealed, the factory often finds that the gear oil in the reducer has been emulsified, and the bearings have been rusted, corroded, and damaged. This is because the gear oil is It is caused by the condensation of moisture generated after heat and cold; of course, it is also closely related to the quality of the bearing and the assembly process.

Solution
Establish a lubrication maintenance system.The reducer can be maintained according to the "five fixed" principle of lubrication work, so that every reducer has the person responsible for regular inspection, and it is found that the temperature rise is obvious, if the temperature exceeds 40 ℃ or the oil temperature exceeds 80 ℃, the quality of the oil decreases or If you find too much copper powder and produce abnormal noise, you should stop using it immediately, check and repair in time, eliminate the fault, and replace the lubricating oil.When refueling, pay attention to the amount of oil to ensure that the reducer is properly lubricated.

CVT Encyclopedia

特点
principle
installation
使用
lubricating

Features of stepless speed changer:
1. High strength: The machine has reliable performance and can rotate accurately when the impact load is applied or the machine is reversed.
2、变速范围大：变速比均为1：5，即输出转速可在1：45至1：7.25之间任意变化。
3. High precision of speed regulation: The precision of speed regulation is 1--0.5 revolutions.
4. Stable performance: The transmission parts of this machine are all subjected to special heat treatment, and the friction parts are processed with precision, with good lubrication, stable operation, low noise and long life.
5. Coaxial structure: input shaft and output shaft rotate in the same direction, small size and light weight.
6. Strong combination ability: This machine can be combined with various types of reducers to achieve low-speed, high-torque variable speed effects.
7. Under the condition of allowable load, the set speed is constant.
8. The whole machine is sealed and can be used in humid, dusty and slightly corrosive working environment.
9. High strength, durability, safety and reliability; speed regulation is extremely simple and convenient.
10. It can work continuously, and it can run in both positive and negative directions, with stable operation, stable performance and environmental protection.
11. The machine body has a compact structure and a small installation space. It is made of high-quality aluminum alloy die-casting and will never rust.

Transmission principle:
While turning the handwheel to drive the speed control cam to change the angular position, the end surface curve of the speed control cam acts on the flat pin clamp and the end surface curve of the fixed cam to cause the speed control cam to move axially, thereby uniformly changing the speed control cam and the fixed ring The interval between the tapered planetary friction wheel produces radial movement.Finally, the working radius of the friction between the planetary friction wheel and the driving wheel, the pressure plate and the fixed ring, and the speed control cam is evenly changed to realize stable stepless speed change.

installation:
1. When installing couplings, pulleys, sprockets, etc. on the output shaft, do not hit hard.Use the screw hole at the outer end of the output shaft, screw in the screw, and press into the coupling.
2. When installing the base-type continuously variable transmission on the foundation, the installation centerline elevation, levelness and related dimensions of the associated parts should be calibrated, and the coaxiality of the calibrated drive shaft should not exceed the allowable range of the coupling.
3. The vertical MB stepless speed changer can be installed at any angle, and the oil level must exceed the center line of the oil mark on the higher side.

use:
1. Before use, the infinitely variable transmission and the reducer should be filled with designated lubricants.
2. The temperature of the working environment of the speed changer should not exceed 40℃, and the temperature of the working oil surface should not exceed 70℃.For example, a higher input speed and a slightly higher temperature rise will occur when the new machine is used. After 80 hours of saturated operation, the temperature rise will gradually decrease. After that, the temperature rise will be at the ambient temperature of 20 ℃-25 ℃ and maintain a stable temperature rise. .
3. The speed must be adjusted when the machine is turned on, otherwise the parts will be damaged.
4. When leaving the factory, the speed control limit screw has been adjusted to the limit position, and should not be adjusted arbitrarily to avoid damage to the parts.
5. Do not exceed the rated torque T for use.
6. It is suitable for forward and reverse operation.
7. If the motor is replaced, the motor flange with the original oil seal should be retained to prevent the lubricant from slipping into the motor.

lubricating:
1. The special lubricating oil for MB continuously variable transmission must use Ub-1 or Ub-3 traction fluid. In any case, ensure that the traction fluid is provided quantitatively according to the oil standard.After 500 hours of operation, the traction fluid should be replaced for the transmission, and the traction fluid should be replaced once more after 1000 hours of operation. After that, the traction fluid should be replaced every 2000 hours or so.
2. The MB level 12 gear part is lubricated with grease. Molybdenum disulfide grease has been added before leaving the factory. Generally, the grease is replaced every 18 to XNUMX months of work.