Traction elevator traction drive relationship. Installed in the engine room of the motor andgear box, brakes and other components tractor, is the traction drive power. Traction ropethrough the pulley end of the connecting car, one end connected to the counterweight. Tomake the shaft of each car along with the re-run instead of the shaft relative to the rub rail,placed on a tractor-driven wheel to separate the two. Car and the counterweight rope of gravity to make traction in the sheave groove pressed friction generated. In this way, the motor rotation drive pulley rotation, drive rope, dragging the car and redo the relative motion. That car up to the heavy fall; increase of weight, the car down. Thus, the car in the shaft along the rail, the next running back and forth, perform vertical lift transport tasks. Carand the counterweight can be relative motion is by traction rope and the friction between the sheave to achieve. This force is called traction force or driving force. Operation of the elevator car and the car’s location the load and the operating direction is changing. To make the elevator in all cases have sufficient traction force, the national standard GB 7588-1995 “elevator manufacturing and installation of safety norms,” states: tractionconditions must be met: T1/T2 × C1 × C2 ≤ efα where: T1 / T2 - contains 125% of ratedload of the car in the station and the empty car at the lowest level of the top station of thetwo cases, the traction sheave rope on both sides of the larger and smaller static tensionof the static tension than. C1 - with acceleration, deceleration, and a special installation ofthe lift coefficient, commonly referred to as power factor C2 - As the lead sheave groovewear cross-section changes by the factor (or semi-circular incision of the slot: C2 = 1, the V groove: C2 = 1.2). efα in, f is the traction rope traction slot in the equivalent friction coefficient, α is the guide wheel traction rope drag on the corners. efα called the tractioncoefficient. It limits the T1/T2 ratio, efα greater indicates that the T1/T2 value and allow the value of T1-T2 allows greater traction capability will show bigger lift. Therefore, an elevatortraction coefficient represents the traction capability of the elevator.