Rail track clearance: high-performance self-propelled snow rotor

The high-performance self-propelled snow rotor is a professional approach to railway track cleaning. Quick track clearance thanks to outstanding snow clearing capacity and large coverage thanks to high transport speeds. Even in the most adverse weather conditions, the track can be cleared in a single go, ensuring smooth rail traffic.

Rail track clearance
Picture: aebi-schmidt

The blower head of the HB-S features 2 blower wheels with nominal diameters and depths that are designed for the required clearing capacity. The two blower wheels rotate in opposite directions. They are protected against damage by shear pins and are driven by the vehicle via cardan shafts. A pre-cutting device is flanged to each blower wheel via an extension shaft for the purpose of breaking up hard-packed snow. The hydraulically swivelling upper pre-cutting devices for removing high levels of snow are fitted above the blower wheels. Every precutting device is protected against breakage by shear pins.

The snow is transported to the blower wheels via a funnel-shaped component, the snow guiding device. The blower wheels are running in the so-called blower wheel housings. Each blower wheel housing is equipped with a tangential chute, through which the snow is ejected over a distance of up to 40 m.

Rail track clearance
Picture: aebi-schmidt

Hydraulically operated feed plates are fitted on the outsides of the snow guiding devices. By opening up these feed plates, the clearing width can be increased. In addition, the two blower head halves can be hydraulically extended.

Two strong pivots (on the right and left) are welded into the vehicle`s support frame. The rocker is mounted on these pivots (similarly to the mounting of a bulldozer blade). The rocker is screwed onto the sliding frame. The entire blower head is thus hydraulically height-adjustable (clearing height) via the rocker. The desired clearing height above the top of the rail can be adjusted manually via a hand wheel on the rocker.

Snow deposits above the rocker (behind the blower head) can be removed hydraulically by means of ejection flaps.

The HB-S railway snow blower is built in a 4-axle version (wheel arrangement BB). This means that two 2-axle bogies are fitted. The bogies are attached to the chassis frame by means of springs and shock absorbers (secondary suspension). All axles are driven by wheel set gears. The wheel set gears in the boogie are interconnected via cardan shafts. The bogies and the entire chassis are approved for speeds of up to 80 km/h during self-propelled and towing operation.

Rail track clearance
Picture: aebi-schmidt

Thanks to a double frame design with a ballbearing slewing ring fitted between the two frames, the snow blower can change the direction of travel.

The service brake and the parking brake (spring-loaded) are designed as shoe brakes. Each wheel has its own brake cylinder. The spring-loaded brake acts on the outer axles. However, the individual axles are rigidly connected to each other via cardan shafts and gears.

The spring-loaded brake is released by means of compressed air. In order to avoid excessive load on the brake leverage, the parking brake and service brake are pneumatically locked against each other.

Railway magazine “Railway Supply”

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