English English
images/2021/02/20/Gear-1.jpg

The herringbone gear of double helical gear

The difference between herringbone gears, spur gears and helical gears
Helical gears are not exactly helical gears. It should be said that helical gears are the meshing method of two helical gears, which are distinguished by the different directions in which they transmit force in space.
Ordinary spur gears enter into meshing along the tooth width at the same time, resulting in shock vibration noise and uneven transmission.
Helical cylindrical gear transmission is better than straight teeth, and can narrow the center distance for high-speed and heavy-duty.
The advantages and disadvantages of helical gears:
1. Because the meshing surface changes from small to large to small, the meshing is stable, the impact is small, and the noise is low;
2. Large carrying capacity, improve life and stability;
3. Small and not easy to undercut, small in size;
4. But the axial thrust is large, the herringbone gear-no axial thrust, but it is troublesome.
Helical gear transmission is composed of two helical gears meshing together. Purpose: To transfer the movement between two phase-shifted axes in space.

Gear 2
Features:
1. The spiral direction can change the center distance and transmission ratio
2. The steering can be changed by spiral rotation
3. Wear block
4. Point contact
5. Small axial force

The herringbone gear of double helical gear. This is the gear transmission classification according to the gear shape. Spur gear is the most common form of plane gear transmission. Herringbone tooth meshing can eliminate axial displacement and stress, reduce bearing damage. Because the tooth surface is in continuous point contact, the noise and impact are small, but the bearing is more demanding. high. Because it produces axial force during transmission, it is generally used in pairs to eliminate axial force.

The helical gear has a lateral force on the shaft. In order to eliminate this force, a gear is made into a helical gear with opposite symmetry to eliminate this force. It looks like a personal character, referred to as a double helical gear. Herringbone gears have the advantages of high coincidence, small axial load, high carrying capacity and stable operation. The herringbone gear frame is adopted to transmit the torque of the main motor or motor unit to the roller. Herringbone gear processing is more complicated and can be processed by the generative method, but the hobbing method cannot process all herringbone gears, and the herringbone gears that are difficult to process by the milling method are more common.

Gear is a common part often used in mechanical transmission. The gear is made of high-quality and high-strength alloy steel, and the surface is carburized and hardened. It has strong bearing capacity and is durable. In practical applications, helical gears are widely used in high-speed and heavy-duty situations due to their stable transmission, low impact, vibration and noise.
Helical gears are not exactly helical gears. It should be said that helical gears are the meshing method of two helical gears, which are distinguished by the different directions in which they transmit force in space. Ordinary spur gears enter into meshing along the tooth width at the same time, resulting in shock vibration noise and uneven transmission. Helical cylindrical gear transmission is better than straight teeth, and can narrow the center distance for high-speed and heavy-duty. Helical gear reducer is a novel reduction transmission device. Adopting the optimized and advanced design concept of modular combination system, it has the advantages of small size, light weight, large transmission torque, stable starting, and fine transmission ratio classification. It can be connected at will and a variety of installation positions can be selected according to user requirements.

 Gear 3

Introduction:
There are many types of gear transmission. Among them, the efficiency of helical cylindrical gears is very high. For example, the transmission efficiency of spur cylindrical gears is lower than that of helical cylindrical gears. The helical cylindrical gear is the same as the spur gear mechanism. The helical cylindrical gear can be used to reduce the center distance a in order to improve the load-bearing capacity of the transmission and can be used for high-speed operation. Helical gear reducer is a novel reduction transmission device. Helical gear reducer is small in size, light in weight, and economical.

Advantages and disadvantages:
advantage:
(1) Good meshing performance: The meshing process between the teeth of the helical cylindrical gear is an excessive process, and the force on the teeth gradually increases from small to large, and then from large to small; helical gears are suitable for high-speed, Overload situation.
(2) Large degree of coincidence: The increase of degree of coincidence increases the bearing capacity of the gear. Thereby extending the life of the gear. The degree of coincidence mainly depends on the meshing time, and the meshing time of the helical gear is long and the contact area is large, which reduces the stress. And make the transmission stable, and increase its economy.
(3) Compact structure: The smaller the minimum number of teeth, the more compact the structure.
Disadvantages and corrections:
Herringbone gear manufacturing is more troublesome.
The axial component of force is harmful to gear transmission, it increases the friction between the devices and makes the devices easy to wear or damage. The main disadvantage of helical gears is that axial force components are generated when the gears mesh. The axial force is caused by the helix angle, and the larger the helix angle, the greater the axial force. In order to prevent the helical gear from generating excessive axial force, it is generally set to = 8-15 in the design.
Herringbone gears can reduce the influence of axial component forces, but the manufacture of herringbone gears is more troublesome. Uneconomical .

Gear 4
Helical gear transmission is composed of two helical gears meshing together.
Purpose: To transfer the movement between two phase-shifted axes in space.
Features:
(1) The spiral direction can change the center distance and transmission ratio;
(2) The steering can be changed by the spiral rotation;
(3) Fast wear;
(4) Point contact;
(5) The axial force is small.

classification:
Helical gear reducer is a novel reduction transmission device. It has many advantages, such as small size and light weight. Due to the optimized cash design concept, the advantages are complemented by weighted average of various properties. The transmitted torque is increased, the transmission ratio is finely graded, and the load-bearing capacity is enhanced, which is durable and economical.
1. Involute helical gear reducer
The involute helical gear reducer has the characteristics of small size, light weight, high load capacity, high efficiency, long service life, convenient installation, wide range of motor power, and fine transmission ratio classification. It can be widely used in equipment that needs to slow down in various industries.
2. Helical gear worm gear reducer
The helical gear worm gear reducer adopts the direct connection form of the motor, and the structure is a first-stage helical gear plus a first-stage worm gear drive. The output is shaft-mounted, with six basic installation forms. It can run forwards and backwards. The helical gear adopts hard tooth surface, stable operation, large carrying capacity, and the working environment temperature is -10℃~40℃. Compared with similar products, this product has the characteristics of large speed range, compact structure and convenient installation. It can be widely used in the deceleration mechanism of various mechanical equipment such as metallurgy, mining, lifting, light industry, chemical industry, transportation, construction and so on.

Gear 5

Helical gears are the most commonly used type of automotive power transmission gears. Generally, they must work under high-speed and heavy-load conditions and require low vibration and noise. In order to improve their dynamic performance at high speeds and reduce vibration and noise, tooth profile modification has become a necessary design and process method.
There are two ways to modify the profile of helical gears.
a is oblique modification, that is, the modified tooth surface is along the direction of the tooth surface contact line. There is no essential difference between the calculation method of this kind of modification and the spur gear, but the modification surface and the involute surface are required to be tangent along the contact line, which is difficult to guarantee in the process.
b is straight modification, that is, the modification surface is parallel to the tooth direction, and the entire tooth surface can be processed into a smooth surface in technology. Most of the modifications actually used in countries around the world are straight modifications. However, because the contact line of the tooth surface of the helical gear is inclined, the straight modification will change the load distribution along the contact line, or even become a non-full-length contact, and then change the coincidence and the load distribution between the teeth, so that the traditional gear modification calculation method Failure, the difficulty of the modification design is greatly increased.

common problem:
1. Common problems and causes of helical gear reducers:
a. Reducer heat and oil leakage;
b. Worm gear wear;
c. Transmission pinion helical gear wear;
d. Worm bearing is damaged.
2. Solutions to common problems of helical gear reducers
(1) Guarantee assembly quality
Professional tools are necessary to ensure assembly quality. Original parts are generally the best choice for disassembly and replacement. When one of the paired parts is damaged, the principle of pair replacement is generally adhered to. When assembling the output shaft, pay attention to the tolerances: the hollow shaft is also the key object that needs to be protected. If there is abrasion, rust or surface dirt, it will affect the disassembly in future maintenance.

Gear 6
(2) Selection of lubricants and additives
The purpose of lubricating oil and additives is to make the reducer still have a layer of oil film attached to the surface to achieve a protective effect when the reducer stops moving. The oil film protection can extend the life of the machine when it is frequently started, and at the same time protect the machine from running at high speed and heavy load. The use of additives can also effectively prevent oil leakage, extend the mission of the seal ring, and maintain softness and elasticity. helical gear. The lubricating oil of worm gear reducer is generally 220# gear oil. The use of additives is generally in poor conditions, such as heavy load and instability caused by frequent starting.
(3) Selection of the installation location of the reducer
Where the location permits, try not to use vertical installation. Vertical installation may cause undesirable conditions such as oil leakage.
(4) Establish a lubrication maintenance system
The "Five Principles" are part of the lubrication maintenance system. The first is to arrange regular inspections to achieve a clear division of responsibilities; then, to strictly control the temperature, generally control the temperature rise not to exceed 40 degrees, and the temperature of the oil does not exceed 80 degrees; the amount of oil must be strictly controlled to ensure The reducer is properly lubricated. When the quality of the oil drops or noise occurs, stop using it immediately and do maintenance work.

Herringbone gear transmission is suitable for transmission of high power and large torque.
There are three types of meshing forms of cylindrical gear transmission: external gear transmission, which is meshed by two external gears, and the rotation of the two wheels is opposite; internal meshing gear transmission, which is meshed by an internal gear and a small external gear, the two wheels The steering is the same; the rack and pinion drive can change the rotation of the gear into the linear movement of the rack, or vice versa.
It is used for transmission between parallel shafts. Generally, the transmission ratio can reach 8, the maximum is 20 in single stage, 45 in two stages, 60 in maximum, and 200 in third stage, and 300 in maximum. The transmission power can reach 100,000 kilowatts, the rotation speed can reach 100,000 revolutions per minute, and the circumferential speed can reach 300 meters per second. The single-stage efficiency is 0.96~0.99. Spur gear transmission is suitable for medium and low speed transmission. Helical gear transmission runs smoothly and is suitable for medium and high-speed transmission.

The helix angle is a unique feature of helical gears and does not exist in spur gears, that is, spur gears. Generally speaking, the helix angle of the helical gear we usually refer to refers to the helix angle on the indexing cylindrical surface. The larger the helix angle, the greater the coincidence degree, which is more conducive to smooth movement and noise reduction. Everything is two-sided. Although increasing the helix angle brings many advantages, the axial force generated during work also increases, so The size of should depend on the quality requirements and processing accuracy of the work, generally 8-25. If there are special requirements for noise, a larger value can be selected according to the situation.
Judgment of spiral direction: First, we set the axis of the gear to be vertical, if the right side of the spiral is high, it is right-handed; otherwise, the left side of the spiral is high-left.

 sogears manufacturing

The best service from our transmission drive expert to your inbox directly.

Get in Touch

NER GROUP CO.,LIMITED

ANo.5 Wanshoushan Road Yantai, Shandong, China

T+86 535 6330966

W+86 185 63806647

© 2021 Sogears. All Rights Reserved.