Rail Transit Door Systems and Entry Aids Bearings

Passenger door systems are complex subsystems in rail vehicles and are subject to heavy loads. The requirements for door systems are very high, such as high reliability and long maintenance intervals. The operating period of the door system is specified by the bus manufacturer. Depending on the model, the door system may be opened more than 2.5 million times. The door system opening process usually includes the door rotary hook and linear opening movement. Rotational motion is achieved with maintenance-free spherical plain and rod end versions. Sometimes radial insert ball bearings with flange seats are also used. In linear motion, the door system is guided by linear ball bearings, rail systems or special rollers. These bearings are either sample standard bearings or components with special modifications, eg optimized outer ring/track contact pressure. Rod ends can be anti-corrosion treated and machined with internal and external left-hand or right-hand threads. As a component of a passenger car, this linear motion must be reliable. INA Linear Ball Bearings are very effective here because of their smooth operation and long life; they also have self-aligning capabilities if required. Depending on the bearing type, the compensating misalignment capability can reach 40'. Due to their small size and low radial section height, linear ball bearings require less space. According to customer needs, bearings are usually self-sealed, and if necessary, corrosion-resistant designs are also available. The shaft on which the linear ball bearing is installed must be of high precision and can be made into anti-corrosion design; the hollow shaft is light in weight, which is especially suitable. Customers can request the length and function of the guide rails according to the actual assembly conditions. Rail systems are suitable for heavy loads, high running and position accuracy requirements and good rigidity. If required, products with general sealing and lubrication and NA special coatings are available. Trucks Bearings for door systems on trucks such as sliding door trucks (HIBBNS, ...) and dump trucks (FALNS, ...) are a priority for robustness, long life and low maintenance. Bearings for closing mechanisms, displacement devices, guide and torque supports, and hinged rods are bolted rollers, rollers, needle bearings and spherical plain bearings. The function of the coupler joint bearing coupler is to realize the connection between the locomotive and the truck and the truck and the truck and transmit the traction force. Some special designs, such as closed couplers, not only transmit traction, but also withstand compressive forces and weight, such as the closed coupler used in intermodal trucks SGGRSS. The coupler transmits loads up to 2 000 kN according to UIC577 or EN12663. ELGES spherical plain bearings have been used in this field for more than 30 years. Initially, maintenance-required steel/steel contact spherical plain bearings were used, but maintenance-free spherical plain bearings with high load-carrying capacity, long service life, and ELGOGLIDE sliding layer are widely used. This long-term development is all in order to realize the needs of vehicle operators to reduce vehicle maintenance costs and downtime.