LJLK Helical-Bevel Gear Reducer

Category:

R, F, K, S gear reduction motors

Summary:

There are two main types of helical-bevel gear reducers: involute helical-bevel gear reducers and helical-worm gear reducers. The involute helical cylindrical helical-bevel gear reducer features compact size, light weight, high load-carrying capacity, high efficiency, long service life, convenient installation, wide range of motor power options, and excellent transmission ratios. It can be widely used in various industries for equipment requiring speed reduction. The helical-worm gear reducer adopts a direct motor connection design and consists structurally of helical gears and worm gears. The output shaft can be mounted in six basic installation configurations: positive offset and negative offset. The helical cylindrical gear teeth have a hard surface, ensuring smooth operation and high load-carrying capacity. The operating temperature range is 10 to 40°C. Compared with similar products, this reducer boasts a wide speed range, a compact structure, and easy installation.

Keywords:

R, F, K, S gear reduction motors

LJLK Helical-Bevel Gear Reducer

There are two main types of helical-bevel gear reducers: involute helical-bevel gear reducers and helical-worm gear reducers.

The helical bevel gear reducer featuring involute helical cylindrical gears and bevel gears boasts advantages such as compact size, light weight, high load-carrying capacity, high efficiency, long service life, easy installation, a wide range of motor power options, and excellent transmission ratios. It can be widely used in equipment across various industries that require speed reduction.

The helical gear-worm gear reducer adopts a direct motor connection. In terms of structure, it features both helical gears and worm gears. The output shaft can be mounted in six basic installation configurations: positive shift and negative shift. The helical cylindrical gears have hard tooth surfaces, ensuring smooth operation and high load-carrying capacity. The operating temperature range is 10 to 40°C. Compared with similar products, this model boasts a wide speed range, a compact structure, and convenient installation.

Let’s start with the conventional helical gear reducer, which uses straight teeth. The primary drawback of straight teeth is that they generate vibration during operation—a vibration that cannot be eliminated. No matter how much you modify the design, change the manufacturing materials, or alter the tooth geometry, the involute profile will inevitably undergo some degree of variation across the entire tooth surface at the same time. This leads to a persistent and unresolved issue: every single tooth engagement results in such vibrations. Consequently, these vibrations place significant stress on the gears and also produce noise. Another disadvantage is that, at times, it becomes impossible to take advantage of the additional strength gained when two pairs of teeth are engaged simultaneously during the contact period. Because the engagement conditions for individual teeth within each cycle limit the stress levels, energy is wasted. However, this problem holds promise for future improvement.

On the other hand, helical-bevel gear reducers are quite different. As their name suggests, helical-bevel gear reducers are designed for internal use. These reducers offer higher transmission efficiency and better transmission accuracy, especially in high-power applications, where they deliver greater torque and more stable operation. We can think of helical gears as a set of cylindrical gears arranged in an interleaved fashion. As these gears rotate, each gear tooth engages with a different rack, effectively compensating for the errors inherent in individual gear teeth. This compensation is particularly effective due to the elasticity of the gear teeth themselves, leading to the following result: For gears with errors within 10 millimeters, the overall error can be averaged out, significantly reducing vibration. Consequently, under load, such gears can operate as smoothly as if their tooth errors were within just 1 millimeter. Moreover, at any given moment, roughly half the time (assuming a contact ratio of around 1.5), two teeth are engaged simultaneously, which provides additional benefits in terms of strength. As a result, the stress can be distributed over 1.5 times the width of a single tooth rather than just one tooth width.

Manufacturing and assembling large numbers of chips to address the issues associated with spur cylindrical gears is both difficult and economically impractical. Therefore, some companies have developed helical cylindrical bevel gear reducers—gears whose teeth follow a helical path. Unlike spur gears, helical gears generate undesirable axial forces. However, the benefits in terms of vibration reduction and increased strength far outweigh the drawbacks of slightly higher axial thrust and modestly increased manufacturing costs. Consequently, in reducer manufacturing, helical gears are now preferred over spur gears.

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