The present invention relates to an internal crash box which enables the crash box to exhibit stable counter-force, prevents the fluctuation of the resistance and the inefficiency of the components during collision of vehicles.

Background of the Invention

Traffic accidents happen due to various reasons between the automobiles which are indispensable means of transport in our day. These accidents can between two cars, as well as they can be with single vehicles or between a vehicle and a pedestrian. These accidents are inevitable even though precautions are taken. Several new safety precautions are developed especially in field of vehicle design in order to prevent accidents and decrease life and property loss that can occur in accidents. These safety cautions can be divided into two as active and passive safety cautions. Active safety comprises notification systems that will increase control and braking abilities of the vehicle so that the driver avoids the accident, and control algorithms that will activate to detect the accident possibility and prevent the vehicle from this possibility. Passive safety is material change caution taken on the vehicle and structural improvements in order to minimize the negative effects of the accident as much as possible in case of an accident.

The problem with the low-speed crash tests used in the prior art is that the metal crash boxes exhibit an unbalanced and fluctuated counter-force, and remain inefficient in energy damping. As a result of this, it is observed that the counter- forces exceed the limits and thus great damages occur on the vehicle body. As a result of this type of low- speed collision tests, since the damages occurring on the vehicle body increase the repair costs, it is aimed to minimize the damage in order to protect the client. In order to prevent this damage, the metal crash box must be able to create the counter-force at a certain level and in a stable manner during the collision. The crash boxes dampen the kinetic energy of the vehicle to a certain extent by means of undergoing plastic deformation. If the crash box profiles are designed considering their damping characteristics, these profiles reduce the negative effects originating from the crash by folding like an accordion. A certain part of the energy is absorbed on the impact absorbing crash boxes after the bumper which receives the first impact during crash. Absorption of energy is realized by the plastic deformation of the impact-absorbing crash boxes by folding like the accordion. At the time of the first collision, the bumper absorbs a certain amount of energy by means being deformed, and then the impact-absorbing crash boxes begin to deform, the reaction force coming in the axial direction reaches its highest value, and then the reaction forces begin to oscillate around an average value. In the meantime, the structure shortens by being intertwined by means of local twists. Shock-absorption systems known in the state of the art cannot realize the energy absorption efficiently against the non-linear forces.

United States patent document no US8123263B2, an application known in the state of the art, discloses an energy absorbing system which is preferably placed on the front bumper of the vehicle and in form of a two level tube. The tubes enter into each other in order to absorb the energy that is created during collision, and thus energy absorption is realized.

United States patent document no US20100148526, an application known in the state of the art, discloses a crash box which is placed on the bumper. It is stated that there are dents on the surfaces of the said crash box which make the deformation easy.

The Problems Solved with the Invention The objective of the present invention is to provide an internal crash box which reduces the cost of damage by preventing the permanent damage on the vehicle body in the event of a low speed collision of the vehicles.

Another objective of the present invention to provide an internal crash box for providing a stable and balanced counter-force of the crash box during the collision of the vehicles and for realizing efficient energy damping.

Detailed Description of the Invention

An internal crash box realized to fulfill the objectives of the present invention is illustrated in the accompanying figures, in which:

Figure 1 is the detailed perspective view of the internal crash box.

Figure 2 is the perspective view of the first crash box and the second crash box.

Figure 3 is the lateral view of A-A section.

The components shown in the figures are each given reference numbers as follows:

1. Internal crash box

2. Crash traverse

3. First crash box

31. First groove

4. Second crash box

41. Second groove

42. Cambered form

C. Crash Box An internal crash box (1), which reduces the effect of the collision on the life cabin and prevents the vehicle body from being permanently damaged in low speed accidents by absorbing the shock effect created by the vehicular accidents, essentially comprises

at least one crash box (C) which is placed on the vehicle chassis and at least one crash traverse (2) which is placed on the crash box (C),

at least one first crash box (3) which is placed on the crash traverse (2), at least one groove (31) which is in form of a channel made on the surfaces of the first crash box (3),

at least one second crash box (4) which is placed inside the first crash box (3).

In the internal crash box (1) of the present invention, there is a crash box (C) preferably located in the front part of the vehicle chassis and a crash traverse (2) is placed on the crash box (C). A first crash box (3) which is preferably made of metal and has a rectangular shape with two opposite hollow ends is placed on the crash traverse (2). In order for the first crash box (3) to perform energy damping efficiently by exhibiting a stable and balanced counter-force during the crash, a second collision box (4) which is preferably made of metal and has a rectangular shape with two opposite hollow ends is placed on the first crash box (3).

A first grove (31) is provided in the form of a channel opened on the surfaces of the first crash box (3). In a preferred embodiment of the invention, there is a first groove (31) extending from a comer of the first crash box (3) to its other comer. In a preferred embodiment of the invention, there are 3 consecutive first grooves (31) on the first crash box (3). By means of the first groove (31), the inwards bending of the first crash box (3) will be easy, in other words it will provide controlled deformation and thus energy absorption will be realized.

In a preferred embodiment of the invention, a second groove in form of a channel is opened on the surface of the second crash box (4). In a preferred embodiment of the invention, the second groove (41) covers the whole surface of the second crash box (41).

There is a second crash box (4) which is connected inside the first crash box (3) by means of spot welding. The second crash box (4) contacts two opposing surfaces of the first crash box (3), for example it is connected to the flat base and top parts. By this means, the first crash box (3) and the second crash box (4) during the crash are enabled to perform energy damping by bending independently from each other, that is by being deformed.

In a preferred embodiment of the invention, the length of the second crash box (4) positioned within the first crash box (3) is shorter than the first crash box (3). Since the second crash box (4) is shorter than the first crash box (3), the first crash box (3) is ahead of the second crash box (4), so that the first contact occurs with the first crash box (3) during the collision. Then the second crash box (4) contacts the collision surface, and eliminates the loosening behavior seen in metals after deformation.

In a preferred embodiment of the invention, a cambered form (42) is arranged on the surface of the second crash box (4) so as to extend along the second crash box (4). The cambered form (42) is positioned at the middle edge of the second crash box (4) and it is intended to increase the cross-section in order to allocate an area so that the towing hook can be used and to create a balanced counter-force by means of the cambered form (42).

By means of the invention, an internal crash box (1) is provided which prevents the metal crash box from creating a fluctuated and unstable counterforce, eliminates the loosening behavior seen after first deformation in metals and excessive increase in counter-force occurring due to ineffective energy absorption and thus prevent permanent damage on the vehicle body after low speed collision.