Why is worm gear called worm gear worm?

wjqww 1 Hello!

Your question: the reason why it is called worm gear and worm, from the definition of bionics, when there is no spiral mechanism, the "spiral" that can give people perceptual cognition is only the volute, the spiral shape of the volute is too peculiar, it will make people think a lot, it has a strong "drilling" strength, is a symbol of "force", the engineering use of such a structure, the invention of the worm gear and worm device did not have an exact name, because the follow-up research found that such a mechanism, can transmit a lot of force, but relative to the gear mechanism, The worm gear is very slow, but it is very useful, so the name worm gear was born, and it can be seen from the worm that it is a bionic name: like a bug (snail or other bug).

In the later research, there are cylindrical worms of Archimedes spiral, involute cylindrical worms, normal straight profile worms, conical wrapping cylindrical worms, arc cylindrical worms, straight profile torus worms, secondary envelope worms, etc., all of which are derived in subsequent studies.

The appearance of worm gears and worms is the result of bionics: volute-like mechanisms, such mechanisms are also used in centrifugal fans and centrifugal water pumps, and their pump casings are all volute-like structures.

I'm sorry, I don't know the one you're talking about.

Hope the above can help you.

The reason why the worm gear worm is called the worm gear worm is derived from bionics.

The appearance of worm gears is the result of biomimicry: a volute-like mechanism. When there is no spiral mechanism, the only "spiral" that can give people perceptual cognition is the volute, and the spiral shape of the volute is reminiscent of a lot:

It has a strong "drilling" energy and is a symbol of "force". The use of such a structure in engineering, when the worm gear device was invented, did not have an exact name, because subsequent research found that such a mechanism can transmit a large force. However, the worm gear is very slow compared to the gear mechanism, but it is very useful, so the name worm gear appeared.

Worm can also be seen to be a bionic name: like a bug (snail or other bug) (gear).

Mechanisms such as worm gears and worms are also used in centrifugal fans and centrifugal water pumps, and their pump casings are all volute-like structures.

Worm gear mechanisms are commonly used to transmit motion and power between two staggered shafts. Worm gears and worms are equivalent to gears and racks in their intermediate planes, and worms are similar in shape to screws.

The worm gear drive mechanism can get very low speeds.

English worm gear: a transmission mechanism that crawls slowly like a bug.

Therefore, the "worm gear and worm" transmission mechanism is used.

When the staggered angle of the worm gear is 90°, it is also necessary to ensure that 1 = 2 and the worm gear and worm helix must rotate in the same direction.

The rotation direction of the worm gear and the worm is determined by the spiral direction of the worm, and the combination of worm gear and worm with the same spiral direction, the relationship between the worm gear steering and the worm steering is the same, such as the worm gear reverses when the worm rotates, and the worm gear rotates forward when the worm reverses; If the worm gear turns to forward when the worm is required to rotate forward, the direction of the worm helix must be changed.

The modulus and pressure angle of the worm and the worm gear in the middle plane are equal respectively, that is, the end face modulus of the worm gear is equal to the axial surface modulus of the worm and is the standard value. The end face pressure angle of the worm gear should be equal to the axial pressure angle of the worm and be a standard value.

When the staggered angle of the worm gear and worm is , it is also necessary to ensure that the rotation direction of the worm gear and the worm helix must be the same.

The transmission efficiency is low, and the wear is more serious. When the worm gear and worm are meshed for transmission, the relative sliding speed between the meshing teeth is large, so the friction loss is large and the efficiency is low. On the other hand, the relative sliding speed makes the tooth surface wear serious and heated, in order to dissipate heat and reduce wear, the most expensive materials with better friction reduction and wear resistance and good lubrication devices are often used, so the cost is higher.

Let's judge in two steps.

Step 1: Determine the direction of rotation of the worm.

This step is relatively simple, stand up the worm to see which side of its spiral is high, the left high is left-handed, and the right high is right-handed. Turning clockwise is right-handed, and counterclockwise is left-handed.

Step 2: Place the worm gear and worm axially in a vertical position.

The direction of rotation of the turbine is determined according to the left-hand and left-handed rule, with the left hand for left-hand rotation and the right-handed rule for right-hand rotation.

The four fingers are bent in the direction of rotation of the turbo rod, the thumb is pointed in the opposite direction of the turbine rotation, and the same is true with the left hand, the four fingers are bent in the direction of rotation of the vortex rod, and the thumb is pointed in the opposite direction of the turbine rotation.

When the weather is cold, you need to let the car idle for a few minutes, which can increase the temperature of the lubricating oil, play a better lubrication effect, and protect the worm gear from wear. Especially in winter when the temperature is below zero, it is best to heat it for a few more minutes.

1. Determine the direction of rotation of the worm or worm gear.

The axis of the worm gear or worm is erected, and the right side of the spiral is high for the right hand, and the left side is high for the left hand.

2. Determine the steering.

The right-handed rule is used for the right-hand rotation, and the active worm is the right-handed hand to hold the worm with four fingers of the right hand along the steering of the worm, and the pointing of the thumb is opposite to the velocity direction of the worm gear and the only node, so as to determine the steering of the worm gear. Place the turbine or worm vertically (the axis is perpendicular to the ground), from left to right, if the spiral descends, it is left-handed, and vice versa.

Note: The worm gear is divided into left-handed and right-handed, left-handed with left-handed, right-handed with right-handed, but under load: if the worm is right-handed, the right hand rotates clockwise when the force is the left tooth surface of the worm indexing circle.

The worm gear and worm structure is commonly used to transmit the motion and power between two staggered shafts, and the worm gear and worm are equivalent to gears and racks in their intermediate plane, and the worm is similar in shape to the screw.

In order to improve efficiency, the worm gear reducer is generally made of non-ferrous metal, and the worm is made of harder steel.

Due to the sliding friction transmission, more heat will be generated during operation, which will produce differences in thermal expansion between the parts of the reducer and the seal, so that the gap will be formed on the various mating surfaces of the reducer, and the lubricating oil will become thinner due to the increase in temperature, which is easy to cause leakage.