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Design principle and stability of rack

(Summary description)The rack is the active part and the gear is the follower

Design principle and stability of rack

(Summary description)The rack is the active part and the gear is the follower

Information
The rack is the active part and the gear is the follower
 
1. Determine the modulus m according to the load (check the value of m in the Mechanical Design Manual)
 
2. Determine the index circle diameter D of the follower gear, D=m*z (where z is the number of teeth of the gear)
 
3. The number of teeth of the gear needs to be comprehensively considered according to the torque and structure of the load. When the torque is large, the number of teeth of the gear can be selected to be larger. The diameter of the gear is larger, and the diameter can be made smaller. Remember the key formula above: D=m*z, which is an important formula
 
4. After determining the index circle diameter D of the gear, the circumference of the index circle diameter can be calculated, assuming L
 
5, L is the effective length of the rack, considering the operation and installation of this strip, in general, the actual length should be greater than L, the specific size is large, in the structural design can be considered.
 
Stability of the rack and pinion in the transmission
 
640.jpg
 
The rack and pinion is quite stable in the process of transmission, so it is a relatively stable one in similar technology, and it has its own characteristics.
 
First, the characteristics of gear transmission: Gear transmission is a kind of transmission form. Compared with other transmissions, it has large transmission power, wide speed range, high efficiency, reliable operation, long service life, compact structure and guaranteed constant transmission ratio. The disadvantage is that the manufacturing and installation accuracy is high and the cost is high, which is not suitable for the transmission with too large the two-wheelbase.
 
Second, gear transmission classification:
 
1. Position according to the axis: plane gear transmission and space gear transmission. Flat gear transmission: according to the direction of gear teeth: spur gear transmission, helical gear transmission and herringbone gear transmission; according to the meshing mode: external meshing, internal meshing and rack and pinion drive; space gear transmission: bevel gear transmission, staggered shaft helical gear transmission And worm gear drive.
 
2. According to whether the gear is closed: open and closed gear transmission. The rack is the active part and the gear is the follower
 
1. Determine the modulus m according to the load (check the value of m in the Mechanical Design Manual)
 
2. Determine the index circle diameter D of the follower gear, D=m*z (where z is the number of teeth of the gear)
 
3. The number of teeth of the gear needs to be comprehensively considered according to the torque and structure of the load. When the torque is large, the number of teeth of the gear can be selected to be larger. The diameter of the gear is larger, and the diameter can be made smaller. Remember the key formula above: D=m*z, which is an important formula
 
4. After determining the index circle diameter D of the gear, the circumference of the index circle diameter can be calculated, assuming L
 
5, L is the effective length of the rack, considering the operation and installation of this strip, in general, the actual length should be greater than L, the specific size is large, in the structural design can be considered.
 
Stability of the rack and pinion in the transmission
 
640.jpg
 
The rack and pinion is quite stable in the process of transmission, so it is a relatively stable one in similar technology, and it has its own characteristics.
 
First, the characteristics of gear transmission: Gear transmission is a kind of transmission form. Compared with other transmissions, it has large transmission power, wide speed range, high efficiency, reliable operation, long service life, compact structure and guaranteed constant transmission ratio. The disadvantage is that the manufacturing and installation accuracy is high and the cost is high, which is not suitable for the transmission with too large the two-wheelbase.
 
Second, gear transmission classification:
 
1. Position according to the axis: plane gear transmission and space gear transmission. Flat gear transmission: according to the direction of gear teeth: spur gear transmission, helical gear transmission and herringbone gear transmission; according to the meshing mode: external meshing, internal meshing and rack and pinion drive; space gear transmission: bevel gear transmission, staggered shaft helical gear transmission And worm gear drive.
 
2. According to whether the gear is closed: open and closed gear transmission.

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