Worm gear mechanisms are commonly used to transmit motion and power between two staggered shafts. The worm gear and the worm are equivalent to the gear and the rack in the middle plane, and the worm is similar in shape to the screw.
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Worm gear
Worm gear mechanisms are commonly used to transmit motion and power between two staggered shafts. The worm gear and the worm are equivalent to the gear and the rack in the middle plane, and the worm is similar in shape to the screw. Basic parameters:
Modulus m, pressure angle, worm diameter coefficient q, lead angle, number of worm heads, number of worm gears, height of tip height (take 1) and head clearance coefficient (take 0.2). Wherein, the modulus m and the pressure angle refer to the modulus and pressure angle of the worm shaft surface, that is, the modulus and pressure angle of the worm wheel end face, and are standard values; the worm diameter coefficient q is the worm index circle diameter and its modulus. The ratio of m.
Conditions for proper meshing of the worm gear:
1 The modulus and pressure angle of the worm and the worm wheel in the intermediate plane are equal, that is, the end face modulus of the worm wheel is equal to the axial modulus of the worm and is the standard value; the end face pressure angle of the worm wheel should be equal to the axial pressure angle of the worm and is the standard Value, ie ==m, ==
2 When the stagger angle of the worm gear is the same, it must be ensured, and the worm wheel and the worm spiral must be the same.
Characteristics of the worm gear and worm mechanism:
Can get a large gear ratio, compacter than the staggered helical gear mechanism
The two-wheel meshing tooth surface is in line contact, and its bearing capacity is much higher than that of the crossed helical gear mechanism.
The worm drive is equivalent to a screw drive and is a multi-tooth mesh drive, so the drive is smooth and the noise is very small.
Self-locking. When the lead angle of the worm is smaller than the equivalent friction angle between the meshing teeth, the mechanism has self-locking property, and the reverse self-locking can be realized, that is, the worm wheel can only be driven by the worm, and the worm can not be driven by the worm wheel. For example, in the self-locking worm mechanism used in its heavy machinery, the reverse self-locking property can play a safety protection role.
The transmission efficiency is low and the wear is serious. When the worm gear is meshed and transmitted, 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 is large, causing severe wear on the tooth surface and serious heat generation. In order to dissipate heat and reduce wear, materials with better anti-friction and anti-wear properties and good lubrication devices are often used, so the cost is high.
Large axial force of the worm
Author: http: //
Author: http: //
Worm gear
Worm gear mechanisms are commonly used to transmit motion and power between two staggered shafts. The worm gear and the worm are equivalent to the gear and the rack in the middle plane, and the worm is similar in shape to the screw. Basic parameters:
Modulus m, pressure angle, worm diameter coefficient q, lead angle, number of worm heads, number of worm gears, height of tip height (take 1) and head clearance coefficient (take 0.2). Wherein, the modulus m and the pressure angle refer to the modulus and pressure angle of the worm shaft surface, that is, the modulus and pressure angle of the worm wheel end face, and are standard values; the worm diameter coefficient q is the worm index circle diameter and its modulus. The ratio of m.
Conditions for proper meshing of the worm gear:
1 The modulus and pressure angle of the worm and the worm wheel in the intermediate plane are equal, that is, the end face modulus of the worm wheel is equal to the axial modulus of the worm and is the standard value; the end face pressure angle of the worm wheel should be equal to the axial pressure angle of the worm and is the standard Value, ie ==m, ==
2 When the stagger angle of the worm gear is the same, it must be ensured, and the worm wheel and the worm spiral must be the same.
Characteristics of the worm gear and worm mechanism:
Can get a large gear ratio, compacter than the staggered helical gear mechanism
The two-wheel meshing tooth surface is in line contact, and its bearing capacity is much higher than that of the crossed helical gear mechanism.
The worm drive is equivalent to a screw drive and is a multi-tooth mesh drive, so the drive is smooth and the noise is very small.
Self-locking. When the lead angle of the worm is smaller than the equivalent friction angle between the meshing teeth, the mechanism has self-locking property, and the reverse self-locking can be realized, that is, the worm wheel can only be driven by the worm, and the worm can not be driven by the worm wheel. For example, in the self-locking worm mechanism used in its heavy machinery, the reverse self-locking property can play a safety protection role.
The transmission efficiency is low and the wear is serious. When the worm gear is meshed and transmitted, 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 is large, causing severe wear on the tooth surface and serious heat generation. In order to dissipate heat and reduce wear, materials with better anti-friction and anti-wear properties and good lubrication devices are often used, so the cost is high. The axial force of the worm is large.
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