Gearboxes for low-floor rail vehicles

Abstract

The invention discloses a gearbox for a low-floor railway vehicle. The gearbox comprises an upper box body and a lower box body which are connected through box combining bolts, wherein the lower box body is provided with an input bearing seat; an input shaft is connected to the input bearing seat through a first cylindrical roller bearing and a second cylindrical roller bearing, and is fixed through a four-point angular contact ball bearing in the axial direction; the four-point angular contact ball bearing is arranged between the two cylindrical roller bearings; the input end of the input shaft is provided with a connecting conical surface of 1:15, and the output end of the input shaft is provided with a driving spiral bevel gear. A multi-stage gear transmission device of a hypoid spiral bevel gear is adopted, and the problem of the 90-degree interesting angle of the input shaft and an output shaft of the gearbox is solved. The input shaft adopts the cylindrical roller bearings and the four-point angular contact ball bearing which are small in axial space and good in lubricating condition, so that the high rotation speed requirement of the input shaft and the requirement for a small-size space are met, the structure is simpler and more reliable, and independent dismounting and mounting can be achieved.

Description

technical field [0001] The invention relates to a gear box for low-floor rail trains, in particular to a gear box for low-floor rail vehicles. Background technique [0002] The height of the internal floor of the low-floor tram from the track surface is generally required to be 350mm, and the height of the entrance is lower. Conventional bogies cannot achieve low floor heights due to the axles and gear drives mounted on the axles. In order to reduce the floor height, the structure diagram of the bogie was rearranged, and the motor and gear transmission device were designed and installed on the outside of the wheel to reduce the space size of the gearbox, effectively reducing the floor height inside the vehicle, but at the same time, new requirements were put forward for the gear transmission device . The traditional bogie gearbox generally adopts one-stage or multi-stage cylindrical helical gear transmission, while the low-floor light rail bogie generally has a 90° angle b...

AI Technical Summary

Problems solved by technology

The rubber coupling described in this invention has many parts, complex structure and complex assembly process

At the same time, the input shaft is a tapered roller bearing, and the lubrication and limit speed are limited.

Bolts are used for hanging, and it is very easy to loosen the hanging due to thread wear caused by vibration during operation

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