SU1729854A1 - Impact-absorbing arrangement of vehicle - Google Patents

Abstract

The invention relates to vehicles (TC), in particular wheeled vehicles, and can be used to improve vehicle safety by reducing overloads in the vehicle cabin. The purpose of the invention is to increase the passive safety of the vehicle. The device contains a bumper beam 1 (YB B), connecting beam 2, connected to it pivotally, cross member 3 placed on the side members of frame 4, with connecting beam 2 connected to cross member 3 by means of support 5, which is connected to the last hinge, and the energy-absorbing element (EPE) 6 of the bumper, made in the form of a square cross-section pipe, rigidly fixed on the crossbar 3 and pivotally on the connecting beam 2. At the initial momentum due to the gap A, the EPE 6 and support 5 are the hinged supports of the connecting beam 2. Due to this sweat p stability EPE 6 occurs at a significantly lower value of the total impact load acting on the bumper, which reduces the overload in the vehicle cabin. During the development of movement in the direction of the longitudinal axis of the vehicle as a result of a process of stable folding along the length of the EPE 6, the bumper 1 and the connecting bars 2 work as one piece, and the support 5 performs the function of a guide. 2 hp f-ly, 6 ill. AND

Description

The invention relates to vehicles, in particular to wheeled vehicles, and can be used to provide passive safety.

The purpose of the invention is to increase the passive safety of the vehicle by reducing the overloads acting on the passengers in the cabin.

Figure 1 shows the energy absorbing device of the vehicle, a general view; figure 2 - the same, under the action of the shock load; Fig. 3 shows a device with a flexible connection between connecting bars and a cross member, general view; figure 4 - the same, under the action of shock loads; Fig. 5 is a diagram of the effect of forces on the structural elements of an energy absorbing device; figure 6 - graph of the load - the movement of the proposed device.

The vehicle energy absorbing device contains a bumper bar 1, connecting bars 2, cross member 3, frame spars 4, support 5, energy absorbing elements 6. At the same time connecting the bars 2 are pivotally connected at one end with a bumper bar 1. with others - with support 5 , and in the middle part of the hinge - with energy absorbing elements 6. The crossbar 3 has through holes in the central part and is rigidly fixed between the frame side members 4 and energy absorbing elements 6. The support 5 is made in the form of a bracket, entering with its ends in the opening across grades 3, the ends of all

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brackets are hingedly connected to one of the ends of the connecting bars 2. Energy-absorbing elements b are installed between the bumper bar 1 and the side members 4 of the frame and are rigidly fixed on the crossbar 3 and hinged on the connecting bars x 2.

The proposed device of FIG. 3 may contain supports 5, made in the form of flexible connections, installed between the crossbar 3 and one of the ends of the connecting bars 2, and guides 7 rigidly fixed on the ends of the crossbar 3, whose through holes enter the through holes of the bumper timber 1.

The vehicle energy absorbing device works as follows:

Loss of stability of one energy-absorbing element 6 occurs at a load F FL Under the action on the bumper beam 1 of the load F FI, we have the scheme of action of forces shown in Fig.5. The load of reps acting on the energy-absorbing element 6 is found from the relationship: AND + l2. l2 2

Fans

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where And is the distance between the point of application of the force Fi / 2 and the point of attachment;

2 - distance between attachment points.

For example, when h h get Rap Fi Fi, i.e. Under the action on the bumper beam 1 of the total load F Fi, a loss of stability begins for each energy absorbing element 6. When using a prototype device, the buckling of the energy-absorbing element 6 begins with a total load on the bumper bar F 2F- |. Since, in the proposed device, the total load is reduced by half, the amount of overload acting on the driver and passengers in the vehicle cabin is also halved (92 0.5 gi), which reduces the possibility of injury in the event of an accident. After loss of stability by the energy-absorbing element b, a process of stable folding will begin and element 6 ceases to perform the role of support. The connecting bars 2, choosing a small gap D and the bumper bar 1 move in the direction of the longitudinal axis of the vehicle with the development of the axial movement of the energy-absorbing element 6 as a whole, the load on the bumper bar 1 is F 2Fa (F2 is the average dynamic load, Fig.6 F2 0.5Fi). Figure 6, reference numeral 1, shows the force acting on the electrolyte absorbing elements in

prototype, and position 2 - in the proposed device. The support 5, which plays the role of an articulated support only until the moment when the energy-absorbing element 6 loses stability, when the energy-absorbing element 6 loses its stability also develops its axial movement and also functions as a guide moving in the direction of the longitudinal axis of the vehicle. The presence of supports 5, made in the form of flexible connections (for example, in the form of a cable, FIG. 3), is due to the fact that the movement of the support 5 may be limited by placing the frame of the power unit of the vehicle (engine) or any auxiliary mechanisms (for example winches). In this case, the bumper bar 1 enters the through

the holes of the guides 7, rigidly fixed on the crossbar 3, and with the development of the axial movement of the energy-absorbing element 6, performs the function of the guides, by changing the lengths of And and g

From equation (1), the required state of force FI and F3ns can be achieved.

Claims (2)

1. Energy absorbing device of the vehicle, containing a bumper bar and energy-absorbing element, made in the form of a thin-walled box-like structure and installed between the bumper beam and the frame spar, so that, in order to increase the vehicle’s passive safety by reducing overloads acting on passengers in the cabin, the device is equipped with a cross bar rigidly fixed between the frame side members and energy absorbing elements, supports mounted symmetrically on the crossbar, and connecting bars, some the ends are hingedly connected with the bumper bar, the other are the joints, and in the middle part they are hinged with energy absorbing elements. 2. The device according to claim 1, of which is with the fact that in the central part of the cross member there are made through holes, and the support is in the form of a bracket, with its ends entering these holes, with the ends of the ends pivotally connected to one of the ends of the connecting bars. 3, The device according to claim 1, wherein the holes are made at the ends of the cross member, into which the ends of the bumper bar enter and the supports are 517298546 are in the form of flexible connections, fixed and one of the ends of connecting bars between the transverse lines. Schi g 2J Have . / /  J H "1 986211 t .. h 2FG Pi  gze ; / - / g tt, I FIG. five 3 s I  y, / J Sc