Gear box

Gearbox for 3-6 passengers lifts speed up to 1m/s

Gearbox with auxiliary brake on slow shaft, EN81-20 compliant.

GEM model HW134B is the solution designed by GEM for the modernization of old plants, calling for substitution of old gearboxes in accordance with EN81-1 and EN81-80 Standards, for the protection against cabin upward over speed and against uncontrolled movements with open doors (par. 5.9.4 of the EN81-80 Standards). GEM model HW134B is the solution for the 3,4 and 6 passengers, designed as a guarantee:
• for the final end user : a low cost safety improvement for the existing lift, with the possibility to split into many steps the overall cost;
• for the installation company: a flexible solution with the possibility to firstly purchase the gearbox prearranged, for future upgrade with the “HW134B emergency brake installation kit”, with extremely easy installation. The gearbox, when prearranged, can be configured either right hand or left hand, with regards to traction sheave position (on request, the traction sheave can be supplied dismounted). The pre-arrangement is available on request for any HW134 model.
• for the maintenance personnel: an exceptional simplicity of operations, given the hand manoeuvre for emergency brake fully integrated with standard brake system, with simultaneous opening and closing of both brakes. Moreover, it is also available (optional on request) an electric control box, to be connected to the main control panel, to optimize tuning of the system. The emergency brake on HW134B is certified according to the European Lift Directive 2014/33/EU and the relevant harmonized norms, it has been designed with utmost safety factor and is nearly maintenance free.

Technical data

 Brake force FT: 3600 N
Braking torque: 780 Nm
Nominal voltage holding: +5%/-10%: 103,5 Vdc
overexcitation: +5%/-10%: 207 Vdc (1s max)
Nominal current holding: 0,492 A
overexcitation: 0,984 A
Resistance: 210 Ohm
Power at 20°C holding: 51 W
overexcitation: 204 W
ED: 60%
Brake weight: 14,3 Kg
Airgap: 0,3 mm (+0+0,1)
Max airgap: 0,6 mm
Temperature range: -25 ÷ 40°C
Protection class: IP54
Insulation class: Class F (155°C)
Switch data Switch voltage: 24 Vdc
Switch current: 10 ÷ 100 mA

Examples of application and calculation of necessary braking torque

1. Balance 50%, useful load 325 Kg, unbal.ropes weight 30 Kg, traction sheave diameter Øtr=600mm; roping 1:1; the necessary braking torque is:
Cf = (Q x 0.5 x (1/r) + f) x 9.81 x (Øtr/2000) = 566.5 Nm < coppia fr.disponibile/available braking torque = 780 Nm
2. Balance 50%, useful load 480 Kg, unbal.ropes weight 48 Kg, traction sheave diameter Øtr=550mm; roping 1:1; the necessary braking torque is:
Cf = (Q x 0.5 x (1/r) + f) x 9.81 x (Øtr/2000) = 777 Nm < coppia fr.disponibile/available braking torque = 780 Nm
The above calculations are intentionally simplifi ed not taking into account further plant data as, for example, compensation ropes weight or tensioning devices. For a more detailed calculation, please ask directly to GEM technical dept.