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This section provides an overview for worm gears as well as their applications and principles. Also, please take a look at the list of 0 worm gear manufacturers and their company rankings.
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A worm gear is a type of screw gear that consists of a worm (worm shaft), which is a threaded toothed shaft, and a worm wheel, which is a helical gear with its axis of rotation at 90 degrees to the worm's axis direction. Rotation of the worm sends the teeth of the worm wheel, which are meshed with the worm, to rotate.
The worm gear transmits rotation from the worm to the worm wheel and vice versa. This inability to rotate from the output shaft side is called "self-locking.
Therefore, the worm side is always the input shaft side, where the power unit is mounted, and the worm wheel side is the output shaft side, where the power transmitting unit is mounted. Because of this feature, worm gears are used in reduction gears.
Worm gears can transmit power by changing the axial direction by 90 degrees, and since they are compact and can obtain a large reduction ratio, they are used in belt conveyors for factory equipment, screw jacks, steering systems for automobile steering wheels, wiper drive units, pivoting mechanisms for electric fans, material input parts of food manufacturing equipment and music boxes, pegs of stringed instruments, etc.
The self-locking function of worm gears may also be utilized in reduction devices for elevators and escalators to serve as a safety device to prevent reverse rotation.
Since a particularly large reduction ratio can be obtained, deceleration can be achieved with a small input torque. Therefore, reduction gears can be manufactured relatively compactly.
The principle of worm gear is that when the worm (input side) makes one rotation, the worm wheel rotates by one tooth. In this case, the number of worm teeth is called one worm. In the case of a worm with two worm strips, one rotation of the worm rotates the worm wheel with two teeth.
The reduction ratio of worm gear can be calculated as follows
Reduction ratio = Number of worm wheel teeth ÷ Number of worm strips
The worm gear can rotate in both directions (e.g., clockwise and counterclockwise when viewed from the input shaft side). This can be achieved by selecting the worm twist direction as right-hand or left-hand twist.
The features of worm gears are as follows:
In contrast to the above advantages, there are some disadvantages, such as heat generation due to friction, which can cause seizure and wear of the gears due to the large slippage between gears. Therefore, lubrication between the gears is important, and lubricants with high extreme pressure resistance may be used.
Typical worm gear materials are as follows:
*Including some distributors, etc.
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Saito Koki Co., Ltd.
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■What is worm gear? A cylindrical ``worm'' with screw-like spiral teeth and a ``worm wheel'' which is a helical gear (helical gear) are meshed at r...
