A Multistage Buffer and Height Adjustable Truck Rear Anti-collision Device

Abstract

The invention belongs to the technical field of truck tail bumper collision avoiding devices and discloses a multistage-buffering and height-adjustable truck tail collision avoiding device which comprises a rigid swing frame, a bumper and a plurality of energy-absorbing buffering and height-adjusting hydraulic cylinders, one end of the rigid swing frame is hinged on crossbeams of a truck while the other end of the same is fixedly connected with the bumper, one ends of the energy-absorbing buffering and height-adjusting hydraulic cylinders are hinged on the bumper while the other ends of the same are hinged at the bottom of a compartment of the truck, and oil incoming holes in the energy-absorbing buffering and height-adjusting hydraulic cylinders are connected with a vehicle-mounted hydraulic system of the truck; each energy-absorbing buffering and height-adjusting hydraulic cylinder comprises a cylinder body and a piston rod positioned in the cylinder body, a sealed side of each cylinder body is hinged to the bottom of the compartment of the truck while an open side of the same is in sealed sliding fit with the corresponding piston rod, the end portion of a rod body of an extending section of each piston rod is hinged to the bumper, an energy-absorbing thread is formed on the rod body of each piston rod positioned in the corresponding cylinder body and is in shear fit with the open side of the corresponding cylinder body, and an opening of each cylinder body is a shear opening; a buffering spring is mounted on the piston rod in each cylinder body in a sleeved manner, and a high-elasticity rubber pad is additionally mounted on an impact face of the bumper.

Description

technical field [0001] The invention belongs to the technical field of anti-collision devices for rear bumpers of freight vehicles, in particular to a multi-stage buffer and height-adjustable anti-collision device for the rear of freight vehicles. Background technique [0002] In recent years, the incidence of freight vehicle accidents has been increasing. According to the statistics of the Traffic Management Bureau of the Ministry of Public Security in 2012, there were 210,812 road accidents involving casualties nationwide, and freight vehicle accidents accounted for 72% of the entire production and operation accidents. Accidents account for a large proportion and often cause heavy casualties. The survival rate of people on rear-end collision cars is very low, because when a rear-end collision accident occurs, the height of the lower edge of the truck's compartment basically falls on the A-pillar with relatively low impact strength of the car, while the passenger car has a l...

AI Technical Summary

Problems solved by technology

[0003] At present, many countries and regions including the United States, Europe and my country require that trucks must be equipped with bumper anti-collision devices at the lower part of the rear to prevent cars from getting under the truck when they collide. The lower part of the tail is generally equipped with bumper anti-collision devices, but these bumper anti-collision devices are mostly simply welded with light and thin angle iron, and then hung on the truck beam to resist the impact of rear-end cars, but these bumper anti-collision devices are often Insufficient strength, it is difficult to effectively prevent faster cars from entering

[0004] Now our country stipulates that the distance between the bumper anti-collision device at the rear of the truck and the ground shall not be greater than 45 cm, which leads to the decrease of the departure angle of the truck. Reduced passability

[0005] Aiming at the deficiency of traditional truck rear bumper anti-collision devices, some truck rear bumper anti-collision devices designed with four-bar linkage mechanism have appeared. Although this design has the ability of height adjustment, it increases the trafficability of trucks. , but the introduction of the four-bar linkage makes the structure of the bumper anti-collision device complex, and at the same time weakens the ability to resist impacts; there are also some truck rear bumper anti-collision devices that simply use springs for buffering and energy absorption. This design leads to A fatal defect, a single spring setting will greatly reduce the overall stiffness of the anti-collision device, and then make the ability of instantaneous energy absorption worse, so as not to meet the special requirements of car collision, that is, the car needs to be in 0.12 seconds after the collision. Systemic absorption about 1.0×10 5 energy in joules

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