DE102017010177A1 - Bumper with angle-dependent reaction - Google Patents

Abstract

A vehicle 20 includes a bumper 10 having a damper 12 with a protective member 1 and block members 2A and 2B. The protective member 1 and the block members 2A and 2B are formed such that in a frontal collision with a body in the vicinity of the block members 2A and 2B, they are at least partially ejected from the protective member 1.

Description

The present invention relates to a bumper for a vehicle having a protective member and first and second block members.

In the prior art shock absorbers are known with multi-element protective elements. DE 10 2009 001 312 A1 describes a shock absorber having a body consisting of materials of different stiffness, wherein a material with low rigidity is arranged in selected areas. DE 10 2004 013 370 B4 relates to a bumper comprising a multi-chambered hollow body, the chambers being filled with foams having different energy absorption capacities. WO 1997/15472 A1 describes a designed as a hollow body and filled with foam element for a bumper. DE 10 2006 041 095 B4 relates to a three-part impact protection element for a vehicle, which has portions of mutually different hardness and recesses for deformation elements. DE 10 2010 037 984 A1 describes a support for a bumper comprising foamed bodies of different hardness. EP 1 291 247 B1 discloses a crash box mounted bumper having a stem having a soft center region and higher hardness edge regions.

• - der Stoßfänger ist insgesamt sehr weich und leistet einen unzureichenden Beitrag zum Crashverhalten des Fahrzeugs;
• - der Stoßfänger umfasst Komponenten, welche das Crashverhalten des Fahrzeugs verbessern, jedoch den Verletzungsschutz beeinträchtigen.

The prior art needs the following improvements:

• - The bumper is very soft overall and makes an insufficient contribution to the crash behavior of the vehicle;
• - The bumper includes components that improve the crash performance of the vehicle, but affect the protection against injury.

The present invention has an object to provide a bumper that offers high protection against injury and improves the structural stability of a vehicle equipped with it.

• - das Schutzelement aus einem elastischen Material mit einem Elastizitätsmodul E1 besteht;
• - das erste und zweite Blockelement aus einem elastischen Material mit einem Elastizitätsmodul E2 mit E2 ≥E1 bestehen;
• - das Schutzelement einen ersten und zweiten Endbereich mit einem ersten und respektive zweiten Hohlraum zur Aufnahme des ersten und respektive zweiten Blockelements aufweist;
• - der erste und zweite Endbereich in Bezug auf die Längsrichtung (1,0,0) linksseitig und respektive rechtsseitig angeordnet sind; und
• - der erste und zweite Endbereich eine erste und respektive zweite Öffnung oder eine erste und respektive zweite Stirnwand mit einer Dicke von 3 bis 50 mm umfassen, die das Schutzelement sowie den ersten und respektive zweiten Hohlraum linksseitig und respektive rechtsseitig begrenzen.

This object is achieved by a bumper for a vehicle having a forward or longitudinal direction (1,0,0), a transverse direction (0,1,0) and a height direction (0,0,1), comprising a carrier and a Damper with a protective element and a first and second block element, wherein

• - The protection element consists of an elastic material having a modulus of elasticity E1;
• the first and second block elements consist of an elastic material with a modulus of elasticity E2 with E2 ≥E1;
• - The protection element has a first and second end portion having a first and respectively second cavity for receiving the first and respectively second block member;
• - The first and second end region with respect to the longitudinal direction (1,0,0) on the left side and the right side are arranged; and
• - The first and second end region comprises a first and respectively second opening or a first and respectively second end wall with a thickness of 3 to 50 mm, which limit the protective element and the first and respectively second cavity on the left side and the right side.

The formation of the protective element and the arrangement of the first and second block element causes in a head-on collision with a pedestrian, the block elements are partially or completely ejected from the protective element and involved in the pulse transmission to a greatly reduced extent. This opens up additional options for the structural and functional design. In particular, the protection against injury and the structural stability against "oblique" or "corner" collisions can be optimized at the same time.

In a variant of the invention, the first and second end walls have a thickness of 3 to 40 mm, 3 to 30 mm, 3 to 20 mm or 3 to 10 mm.

In a variant of the invention, the first and second end walls have a thickness of 5 to 30 mm or 10 to 30 mm.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,8}⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen. In a variant of the invention, the first and second block elements each have one or more first and respectively second surface areas having a first and respectively a second overall size of 25 to 400 cm ² , in which a first and respectively second normal vector (NA1, NA2, NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0.8⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,8}⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have one or more first and respectively second surface areas having a first and respectively a second overall size of 25 to 300 cm ² , in which a first and respectively second normal vector (NA1, NA2, NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0.8⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,8}⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have one or more first and respectively second surface areas with a first and second overall size of 25 to 200 cm ² , in which a first and respectively second normal vector (NA1, NA2, NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0.8⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,8}⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have a first and respectively second planar or spherically convex surface area having a first and respectively second size of 25 to 400 cm ² , in which a first and respectively second normal vector (NA1, NA2 , NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0.8⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,8}⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have a first and respectively second planar or spherically convex surface region having a first and respectively second size of 25 to 300 cm ² , in which a first and respectively second normal vector (NA1, NA2 , NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0.8⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,8}⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have a first and respectively second planar or spherically convex surface region having a first and second size of 25 to 200 cm ² , in which a first and respectively second normal vector (NA1, NA2 , NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0.8⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,}\text{6}\cdot ⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have one or more first and respectively second surface areas having a first and respectively a second overall size of 25 to 400 cm ² , in which a first and respectively second normal vector (NA1, NA2, NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0\text{6}\cdot ⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0\text{6}\cdot ⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,}\text{6}\cdot ⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have one or more first and respectively second surface areas having a first and respectively a second overall size of 25 to 300 cm ² , in which a first and respectively second normal vector (NA1, NA2, NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0\text{6}\cdot ⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0\text{6}\cdot ⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,}\text{6}\cdot ⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have one or more first and respectively second surface areas with a first and second overall size of 25 to 200 cm ² , in which a first and respectively second normal vector (NA1, NA2, NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0\text{6}\cdot ⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0\text{6}\cdot ⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,}\text{6}\cdot ⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have a first and respectively second planar or spherically convex surface area having a first and respectively second size of 25 to 400 cm ² , in which a first and respectively second normal vector (NA1, NA2 , NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0\text{6}\cdot ⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0\text{6}\cdot ⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,}\text{6}\cdot ⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have a first and respectively second planar or spherically convex surface region having a first and respectively second size of 25 to 300 cm ² , in which a first and respectively second normal vector (NA1, NA2 , NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0\text{6}\cdot ⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0\text{6}\cdot ⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

und $$\begin{array}{cccc}\text{NB}1>\mathrm{0,}& \text{NB}2>\mathrm{0,}& \left|\text{NB}3\right|<\mathrm{0,}\text{6}\cdot ⊡\text{NB}\mathrm{1,}& \mathrm{0,34}\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le \mathrm{0,94}\end{array}$$

erfüllen.In a variant of the invention, the first and second block elements each have a first and respectively second planar or spherically convex surface region having a first and second size of 25 to 200 cm ² , in which a first and respectively second normal vector (NA1, NA2 , NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0\text{6}\cdot ⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0\text{6}\cdot ⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill.

In a variant of the invention, the quotient E1 / E2 from the modulus of elasticity E1 of the protective element and the elastic modulus E2 of the first and second block element is 0.001 to 0.8 (0.001 ≦ E1 / E2 ≦ 0.8).

In a variant of the invention, the quotient E1 / E2 from the elastic modulus E1 of the protective element and the elastic modulus E2 of the first and second block element is 0.01 to 0.8 (0.01 ≦ E1 / E2 ≦ 0.8) or 0.1 to 0.8 (0.1 ≤ E1 / E2 ≤ 0.8).

In a variant of the invention, the first and second cavities are designed in a form-fitting manner to the first and respectively the second block element.

In a variant of the invention, the protective element is integrally formed.

In a variant of the invention, the protective element partially or completely envelops the first and second block elements.

In a variant of the invention, the protective element encloses the first and second block element partially or completely.

In a variant of the invention, a shortest distance between an outer surface of the protective element and 50 to 90% of the surface of the first and second block element is ≤30 mm.

In a variant of the invention, a shortest distance between an outer surface of the protective element and 50 to 90% of the surface of the first and second block element is ≦ 25 mm, ≦ 20 mm, ≦ 15 mm or ≦ 10 mm.

In a variant of the invention, the protective element consists of a foam of a polymeric material.

In a variant of the invention, the first and second block elements consist of a foam of a polymeric material.

Further advantages, features and details will become apparent from the following description, in which - where appropriate, with reference to the drawings - at least one embodiment is described in detail. The same, similar and / or functionally identical parts are provided with the same reference numerals.

• 1 eine schematische Draufsicht eines Fahrzeugs mit einem Stoßfänger;
• 2 ein Schutzelement eines Stoßfängers mit Endbereichen, die stirnseitige Öffnungen aufweisen;
• 3 ein Schutzelement mit geschlossenen Endbereichen;
• 4 ein Blockelement eines Stoßfängers.

It shows:

• 1 a schematic plan view of a vehicle with a bumper;
• 2 a protective member of a bumper having end portions having front openings;
• 3 a protective element with closed end regions;
• 4 a block element of a bumper.

1 shows a schematic plan view of a vehicle 20 with a bumper 10. The bumper 10 includes a carrier 11 and a damper 12 with a protective element 1 and a first and second block element 2A and 2 B , The protective element 1 has the function in an accident with a pedestrian, bicycle or motorcyclist and an associated collision of a body part, such as a leg with the bumper 10 to dampen the impact and to avoid or minimize injury. Preferably, the protective element consists 1 of a soft elastic material, in particular of a foamed polymeric material, and extends across the full width of the vehicle 20.

A forward direction of the vehicle 20 and the bumper 10 is indicated by a vector (1,0,0) and a transverse direction by a vector (0,1,0). An in 1 not shown height direction (see 4 ) is represented by a vector (0,0,1).

The longitudinal direction (1,0,0), the transverse direction (0,1,0) and the elevation direction (0,0,1) form an orthonormal right-handed coordinate system, the latex product of which [(1,0,0) x (0,1 , 0)] · (0,0,1) = +1. In the present invention, the terms "left side" and "right side" denote sides and directions, respectively, in which the vector (0,1,0) and the opposite vector (0, -1,0) respectively point. The first and second block elements 2A and 2 B are in a first left-side and respectively second right-side end region 3A and 3B of the protective element 1 arranged. The protective element 1 encloses each of the block elements 2A and 2 B partially or completely.

Unlike the protective element 1 have the block elements 2A and 2 B In addition to the injury protection another function as a blocker or weak crash boxes for "oblique" collisions with stationary objects or other vehicles. Here, the term "oblique" refers to a collision near the end regions 3A or 3B under an angle substantially inclined to the longitudinal direction (1,0,0) in the range of about 30 to 70 degrees.

Preferably, the block elements are also 2A and 2 B made of a foamed polymeric material. The elasticity modulus of the material from which the block elements are expedient is expedient 2A and 2 B are made larger than the modulus of elasticity of the material from which the protective element 1 is shaped.

2 shows a schematic sectional view of an advantageous embodiment of the protective element 1 , The first and second end area 3A and 3B comprise a first and second cavity, respectively 4A and 4B , for receiving the first and respectively second block element 2A and 2 B serve. The end area 3A and 3B have a first and respectively second end opening 5A and 5B on that the first cavity 4A left side and respectively the second cavity 4B limit on the right side. As in 2 indicated by dashed arrows 30, the first and second block element 2A and 2 B through the first and respectively second opening 5A and 5B from the first and respectively second cavity 4A and 4B partially or completely extracted or ejected. According to the invention, an ejection of the block elements 2A and 2 B from the protective element 1 intended if, in the case of an accident involving a pedestrian, cyclist or motorcyclist, a body part, for example a leg near one of the end areas, is intended 3A or 3B of the protective element 1 bouncing on the bumper. In such a collision, the momentum transfer occurs predominantly in the longitudinal direction or in the direction of the vector (-1,0,0). The inventive construction of the protective element 1 and the corresponding arrangement of the block elements 2A and 2 B causes the block elements in such a collision 2A and 2 B from the protective element 1 be partially or completely ejected and transmit virtually no impulse. This allows the elastic modulus of the material making up the block elements 2A and 2 B are made to increase without increasing the risk of injury. Accordingly, the invention provides additional options for the structural and functional design. In particular, the protection against injury and the structural stability to "oblique" or "corner" collisions can be optimized in a mutually compatible manner.

3 shows a further advantageous embodiment of the protective element 1 in which the elements for receiving the block elements ( 2A . 2 B ) certain cavities ( 4A . 4B ) on the left and right side by a first and respectively second end wall 6A and 6B are limited. The end walls 6A and 6B serve to the block elements 2A and respectively 2B are stable in position in the protective element 1 to keep. At the same time are the end walls 6A and 6B designed such that they burst at low force or small momentum transfer and the block elements 2A and 2 B - As indicated by the dashed arrows 30 - are ejected. Accordingly, the end walls have 6A and 6B a small thickness in the range of 3 to 50 mm.

4 shows a perspective view of a first block element 2A that has a first surface area 7A having a normal vector directed perpendicular to the surface (NA1, NA2, NA3). The block element 2A and the protective element are designed such that the block element arranged or held in the protective element according to the invention 2A in a collision with a momentum transfer directed substantially opposite to the longitudinal direction (1,0,0), accelerated on the left side or in the transverse direction (0,1,0), and, as previously mentioned in connection with FIG 1 and 2 described, is partially or completely ejected from the protective element. Preferably, the surface area 7A a size of 25 to 400 cm ² .

beschrieben, wobei der Quotient $\frac{\text{-NA}2}{\sqrt{{\left(\text{NA}1\right)}^2+{\left(\text{NA}2\right)}^2}}$

den Kosinus des besagten Winkels angibt.The surface area 7A is designed such that the normal vector (NA1, NA2, NA3) is tilted on the right side with respect to the longitudinal direction (1, 0, 0) such that an angle between a transverse projection (NA1, NA2, 0) of the normal vector and the longitudinal direction (FIG. 1,0,0) is about 20 to 70 degrees. Mathematically, this condition is determined by the relationships $$\begin{array}{ccc}\text{N / A}1>0& \text{N / A}2<0& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

described, wherein the quotient $\frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}$

indicates the cosine of said angle.

In the following is the block element 2A or the surface area 7A such that the normal vector (NA1, NA2, NA3) is directed essentially parallel to the transverse plane spanned by the longitudinal direction (1,0,0) and the transverse direction (0,1,0). This condition is mathematically determined by the relation | NA3 | <0.8⊡NA1 or | NA3 | <0.6⊡NA1 described. Preferably, the component NA3 is small or | "NA3 | ≈ 0".

The in 4 surface area shown 7A is spherically convex, with the normal vector (NA1, NA2, NA3) within the surface area 7A varies depending on the choice of the point of view. In alternative embodiments of the invention, the surface area is 7A just formed, wherein the normal vector (NA1, NA2, NA3) is constant. In further likewise expedient embodiments, the first block element comprises 2A two or more surface areas which adjoin one another in a facet-like manner or form a tessellation, only partially touch each other or are also separated from one another. In embodiments with multiple surface areas 7A these have in total a size of 25 to 400 cm ² .

The second or right-sided, in 1 to 3 2B is a mirror-symmetrical to the first block member with respect to a sagittal plane defined by the longitudinal direction (1,0,0) and the height direction (0,1,0) 2A and comprises a second surface area with a normal vector (NB1, NB2, NB3). In the inventive arrangement of the block elements 2A and 2 B in the protective element, the relationship (NB1, NB2, NB3) = (NA1, -NA2, NA3) is fulfilled in mutually mirror-symmetrical reference points of the first and second surface regions.

erfüllt.The second block element and the protective element are designed such that the second block element in the event of a collision with a momentum transfer, which is directed substantially in the opposite direction to the longitudinal direction (1,0,0), on the right side or in the negative transverse direction (0, -1,0 ) and, as described above in connection with 1 and 2 described, is partially or completely ejected from the protective element. To effect this, the protection element and the second block element are formed such that the normal vector (NB1, NB2, NB3) of the second surface area forms the relationships $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

Fulfills.

The invention illustrated and explained in more detail in the above description by embodiments is not limited by the disclosed examples. One skilled in the art can derive a variety of additional variations from the description without departing from the scope of the invention. Embodiments exemplified in the specification merely represent examples that are in no way to be construed as limiting the scope, uses, or configuration of the invention. Rather, the description and figures enable the skilled person to rework the examples. In this regard, while being aware of the disclosed inventive concept, those skilled in the art can make various changes in the function, design, and arrangement of individual elements of the examples without departing from the scope of the claims and the legal equivalents disclosed in the specification.

LIST OF REFERENCE NUMBERS

1 ................

protection element

2A .............

first block element

2 B .............

second block element

3A .............

first end portion of the protective element 1

3B .............

second end portion of the protective element 1

4A .............

first cavity

4B .............

second cavity

5A .............

first opening

5B .............

second opening

6A .............

first end wall

6B .............

second end wall

7A .............

Surface area of the first block element 2A

10 ..............

bumper

11 ..............

carrier

12 ..............

damper

20 ..............

vehicle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009001312 A1 [0002]
• DE 102004013370 B4 [0002]
• WO 1997/15472 A1 [0002]
• DE 102006041095 B4 [0002]
• DE 102010037984 A1 [0002]
• EP 1291247 B1 [0002]

Claims (7)

A bumper (10) for a vehicle (20) having a longitudinal direction (1,0,0), a transverse direction (0,1,0) and a height direction (0,0,1), comprising a carrier (11) and a damper (12) with a protective element (1) and a first and second block element (2A, 2B), wherein - The protective element (1) consists of an elastic material having a modulus of elasticity E1; - the first and second block elements (2A, 2B) consist of an elastic material having a modulus of elasticity E2 with E2 ≥E1; - The protective element (1) has a first and second end portion (3A, 3B) having a first and respectively second cavity (4A, 4B) for receiving the first and respectively the second block element (2A, 2B); - The first and second end region (3A, 3B) with respect to the longitudinal direction (1,0,0) on the left side and the right side are arranged; and the first and second end regions (3A, 3B) comprise a first and respectively second opening (5A, 5B) or a first and respectively second end wall (6A, 6B) with a thickness of 3 to 50 mm, which comprises the protective element (1) and the first and respectively second cavity (4A, 4B) on the left side and respectively the right side limit. Bumper (10) to Claim 1 wherein the first and second block elements (2A, 2B) each have one or more first and second surface regions (7A) respectively having a first and second overall size of 25 to 400 cm ² , in which a first and second normal vector (NA1, NA2, NA3) and (NB1, NB2, NB3) the conditions $$\begin{array}{cccc}\text{N / A}1>0& \text{N / A}2<0& \left|\text{N / A}3\right|<0.8⊡\text{N / A}\mathrm{1,}& 0.34\le \frac{\text{-N / A}2}{\sqrt{{\left(\text{N / A}1\right)}^2+{\left(\text{N / A}2\right)}^2}}\le 0.94\end{array}$$

and $$\begin{array}{cccc}\text{NB}1>0& \text{NB}2>0& \left|\text{NB}3\right|<0.8⊡\text{NB}\mathrm{1,}& 0.34\le \frac{\text{NB}2}{\sqrt{{\left(\text{NB}1\right)}^2+{\left(\text{NB}2\right)}^2}}\le 0.94\end{array}$$

fulfill. Bumper (10) to Claim 1 or 2 wherein the quotient E1 / E2 of the elastic modulus E1 of the protective member 1 and the elastic modulus E2 of the first and second block members (2A, 2B) is 0.001 to 0.8 (0.001 ≦ E1 / E2 ≦ 0.8). Bumpers (10) according to one or more of Claims 1 to 3 in that the first and second cavities (4A, 4B) are designed in a form-fitting manner to the first and respectively the second block element (2A, 2B). Bumpers (10) according to one or more of Claims 1 to 4 wherein a shortest distance between an outer surface of the protective member (1) and 50 to 90% of the surface of the first and second block members (2A, 2B) is ≤30 mm. Bumpers (10) according to one or more of Claims 1 to 5 , wherein the protective element (1) consists of a foam made of a polymeric material. Bumpers (10) according to one or more of Claims 1 to 6 wherein the first and second block members (2A, 2B) are made of a foam of a polymeric material.

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