Bare weight two-stage friction-type lower side bearing

Abstract

The invention relates to a bare weight two-stage friction-type lower side bearing which comprises an inner seat of the side bearing and an outer sleeve of the side bearing which are sleeved and matched with each other, wherein a pressing block of the inner seat of the side bearing is arranged at the upper part of the inner seat of the side bearing; a heavy-load friction plate is arranged at the top part of the pressing block of the inner seat of the side bearing; a pressing plate of the outer sleeve of the side bearing is arranged at the upper part of the outer sleeve of the side bearing; a non-load friction plate is arranged at the top part of the pressing plate of the outer sleeve of the side bearing; the friction factor muk of the non-load friction plate is greater than the friction factor muz of the heavy-load friction plate; an elastic element for controlling the vertical position relation between the inner seat of the side bearing and the outer sleeve of the side bearing is arranged between the inner seat of the side bearing and the outer sleeve of the side bearing; and the mechanical property of the elastic element enables the non-load friction plate and the heavy-load friction plate to meet the following position relation: in an empty car state, the horizontal position of the non-load friction plate is higher than the that of the heavy-load friction plate, and in a heavy car state, the horizontal position of the non-load friction plate is flush with that of the heavy-load friction plate. A railway freight car bogie assembled with the lower side bearing has higher critical speed in the no-load state and better curve negotiation capacity in the heavy-load state.

Description

technical field [0001] The invention relates to a lower side bearing on a bogie of a railway freight car for carrying the weight of a car body, in particular to an empty-weight two-stage friction lower side bearing. Background technique [0002] The railway freight car bogie is a key component of the railway freight car. It basically consists of two side frames and a bolster. The two ends of the side frame are installed on the front and rear through the bearing saddle and the bearing. In the composition of the wheel set, the two ends of the bolster are installed in the central box composed of the side frames through two sets of central spring suspension devices. Two sets of central spring suspensions are used to bear the load composed of bolsters. The center of the bolster is provided with a lower center plate, and the two sides of the bolster are provided with lower side bearings, which are respectively matched with the upper center plate and upper side bearings at the bot...

AI Technical Summary

Problems solved by technology

However, the difficulty in the conception of this full side bearing structure lies in the large difference between the empty and heavy loads of railway wagons

Under heavy load, the friction torque of the side bearing is too large, and the lateral force of the wheel and rail increases when the car body passes the curve, which increases the risk of derailment and the wear of the wheel rim

If the friction coefficient of the lower side bearing is reduced in order to reduce the friction moment of the lower side bearing under heavy load, the friction moment of the lower side bearing under no load will be too small, so that the critical speed of the bogie when empty is too low

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