Bus chassis articulated system for urban bus rapid transit system and working method thereof

Abstract

The invention discloses a bus chassis articulated system for a urban bus rapid transit system and a working method thereof. The bus chassis articulated system consists of a turntable device, a hydraulic system and a system control unit ECU, wherein the turntable device comprises a turntable connected between a front turntable frame and a rear turntable frame; the central position of the turntable is movably connected with a mandril positioned in a vertical center line of the turntable; the upper free end of the mandril is connected with an articulated angle sensor; the hydraulic system comprises a left hydraulic cylinder, a right hydraulic cylinder, a hydraulic integrated block, a hydraulic pump and an oil tank which are arranged on the rear turntable frame and rotate together with the rear turntable frame; hydraulic arms of the left and right hydraulic cylinders are respectively sleeved with a cylindrical helical compression spring; front and rear cavities of the left and right hydraulic cylinders are in crossed connection and oil ways are communicated through the hydraulic integrated block; and the system control unit ECU comprises a microprocessor CPU. The bus chassis articulated system provides a larger torque during large-angle turning, realizes the self-locking function on the maximum articulated angle, and prevents a second axle from laterally sliding and front and rear bus bodies from shearing.

Description

technical field [0001] The invention relates to a passenger car used in a bus rapid transit system (Bus Rapid Transit for short, BRT), in particular to a chassis hinge system of a rear-engined passenger car. Background technique [0002] The BRT system is a new type of public passenger transportation system between the rapid rail transit and the conventional bus. The bus of the urban rapid transit system is generally a large-scale articulated vehicle composed of a front body and a rear body, and the front and rear bodies are hinged together by a hinge device. The front body has two axles: the front axle is the steering axle, and the rear axle is the support axle; the rear body has only one drive axle, which is located at the rear of the rear body. Both the engine and the transmission device are arranged on the rear car body to meet the low-floor requirements of buses in the urban rapid transit system. The entire passenger car moves forward relying on the push of the rear b...

AI Technical Summary

Problems solved by technology

The entire passenger car moves forward relying on the push of the rear body, so it is a push-type articulated vehicle. Its transmission arrangement makes the passenger car generate a torque around the vertical axis of the center of the turntable when driving, and this torque will change the driving performance of the vehicle. Features, first, if the hinged system rotates too undamped, when the lateral force provided by the ground to the center axle wheel is small (such as rainy and snowy roads, etc.), the rear body of the vehicle will easily push the center axle sideways, In severe cases, "V"-shaped shearing occurs on the front and rear car bodies; second, if the hinge system is too undamped during high-speed driving, the vehicle will not be stable. When braking suddenly at high speed, due to Due to the action of inertial force, the center shaft of the vehicle is subjected to a sudden increase in thrust, and the rear body of the vehicle is easy to push out the center shaft, causing the vehicle to become unstable; third, during the turning process, if the damping of the hinge system is too small, when the vehicle speed is high, V-shaped shearing is easy to occur; if the damping is large, the necessary rotation will be prevented during the turning process, and the front and rear car bodies tend to go straight forward; when the brake is suddenly applied during the turning process, due to the inertial force The torque of the central axle increases, and when the lateral force provided by the ground to the central axle wheels is insufficient, the front and rear car bodies are prone to V-shaped shearing, resulting in accidents

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