Transmission sprocket, also known as roller sprocket, wheels with coil-toothed chain teeth, for meshing with the block with accurate pitch on the link or cable; A solid or spoke gear engaged with a chain to transmit motion. The commonly used pitch of sprocket wheel matching chain is 12.7mm, 15.875mm, 19.05mm and 25.4mm. The commonly used rollers are 7.92mm, 10.16mm, 11.91mm and 15.88mm in diameter. Sprocket in the transmission equipment plays a vital role in the movement, so the material should ensure that the wheel teeth have enough strength and wear resistance, so sprocket tooth surface generally after heat treatment, to achieve a certain degree of hardness. Sprocket profile must ensure that the chain energy saving smoothly into and out of meshing, as far as possible to reduce the impact of meshing link and contact stress, and to be easy to machining.
Sprocket parameter calculation formula:
Pitch circle diameter: d = p/sin180 ° / z p = pitch (look-up table) z = number of teeth
Addendum circle (outside diameter) : D = p * (0.54 + cot180 ° / z)
Pitch circle diameter: d = p/sin (180 ° / z)
Crown diameter: dmax=d+1.25p-d1
Dmin =d+ (1-1.6/z) p-d1
Diameter of tooth root circle: df=d-d1
Note: p chain pitch z sprocket number d1 chain roller diameter
Sprocket model: including non-standard sprocket (customized according to customer drawings), standard sprocket (American standard and metric).
Sprocket wheel material: C45Sprocket common processing methods: quenching treatment, black surface treatment.
General principle for selection of sprocket teeth: 19 teeth or above are generally used for active sprocket running at medium or high speed under normal working conditions; Below 17 teeth are used only for bar spacing active sprockets. 23 or more teeth are recommended for impact conditions. When the speed ratio is low, with a high number of teeth sprocket can greatly reduce the chain link torque, chain tension load and bearing load.
Chain wheel is one of the important of a lot of machinery accessories, its basic function and applied, have achieved good standards of important practical applications, but its basic quality assurance, and its materials have important relations, convenient and its performance, good quality and basic guarantee to ensure the best efficiency, and high quality product to have a material basis. Good, just can assure to have best efficiency foundation to assure, and high quality product wants to have the foundation of material.
Sprocket is widely used in conveying machinery, textile machinery, food processing, logistics and transport industries such as mechanical transmission. |
