`All bearings are roller bearing,all shaft material are alloy steel
`The chains are high precision and high strength chains with forced lubrication
`The drum is grooved.The high speed end and low speed end of drum adopt pneumatic tube cluth;the brake drum and brake disk adopt forced water cooling;the brake drum and brake disk are case-hardening treated with excellent wear-resistance capacity and long service life.
`The toot profile of sprocket is intermediate frequency hardening treated,all shifting cluth are involute spline type clutch
`The main brake is band brake or hydraulic disk brake,the auxiliary brake is eddy current brake(water cooled or air-cooled)
