US2011232806A1PendingUtilityA1

Side rail

34
Assignee: BENTELER AUTOMOBILTECHNIK GMBHPriority: Mar 25, 2010Filed: Mar 23, 2011Published: Sep 29, 2011
Est. expiryMar 25, 2030(~3.7 yrs left)· nominal 20-yr term from priority
Inventors:Markus PellmannMartin PohlMartin SchroeterStefan AdelbertOtto BuschsiewekeChristian Handing
B62D 21/157B62D 25/025C21D 1/673C21D 9/0068B62D 29/007C21D 2221/00
34
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Claims

Abstract

A side rail made of sheet steel includes a first region which underwent heat treatment, a second region which is not heat-treated, and a transition zone between the first and second regions. The transition zone is hereby defined by a width which is smaller than or equal to 50 mm. An additional component can be coupled to the side rail to form a side rail assembly.

Claims

exact text as granted — not AI-modified
1 . A side rail made of a sheet steel, said side rail having a first region which underwent heat treatment, a second region which is not heat-treated, and a transition zone between the first and second regions, said transition zone defined by a width which is smaller than or equal to 50 mm. 
     
     
         2 . The side rail of  claim 1 , said side rail produced by hot-forming and press-hardening of a steel sheet blank, said first region undergoing heat treatment after press-hardening. 
     
     
         3 . The side rail of  claim 1 , wherein the width of the transition zone is less than 30 mm. 
     
     
         4 . The side rail of  claim 1 , wherein the width of the transition zone is less than 20 mm. 
     
     
         5 . The side rail of  claim 1 , further comprising joining flanges having at least one region which is heat-treated 
     
     
         6 . The side rail of  claim 1 , said side rail having openings having at least one area which is heat-treated. 
     
     
         7 . The side rail of  claim 1 , said side rail having recesses having at least one area which is heat-treated. 
     
     
         8 . The side rail of  claim 1 , wherein the first region of the side rail is an end region, said side rail further comprising a joining flange arranged on the end region, wherein the joining flange is not heat-treated. 
     
     
         9 . The side rail of  claim 1 , wherein the first region has spot-shaped zones defined by a size which is less than 50 mm. 
     
     
         10 . The side rail of  claim 1 , wherein the first region has spot-shaped zones defined by a size which is less than 30 mm. 
     
     
         11 . The side rail of claim, wherein the first region is defined by a yield strength between 300 N/mm 2  and 1300 N/mm 2 . 
     
     
         12 . The side rail of  claim 1 , wherein the first region is defined by a yield strength from 400 N/mm 2  to 800 N/mm 2 . 
     
     
         13 . The side rail of  claim 1 , wherein the first region is defined by a yield strength from 400 N/mm 2  to 600 N/mm 2 . 
     
     
         14 . The side rail of  claim 1 , wherein the first region is defined by a tensile strength between 400 N/mm 2  and 1600 N/mm 2 . 
     
     
         15 . The side rail of  claim 1 , wherein the first region is defined by a tensile strength from 500 N/mm 2  to 1000 N/mm 2 . 
     
     
         16 . The side rail of  claim 1 , wherein the first region is defined by a tensile strength from 550 N/mm 2  to 800 N/mm 2 . 
     
     
         17 . The side rail of  claim 1 , wherein the first region is defined by a ductility between 10% and 20%. 
     
     
         18 . The side rail of  claim 1 , wherein the first region is defined by a ductility from 14% to 20%. 
     
     
         19 . The side rail of  claim 1 , wherein the transition zone has a yield strength or a tensile strength, or both, decreasing with a gradient of more than 100 N/mm 2  per 1 cm. 
     
     
         20 . The side rail of  claim 1 , wherein the transition zone has a yield strength or a tensile strength, or both, decreasing with a gradient of more than 200 N/mm 2  per 1 cm. 
     
     
         21 . The side rail of  claim 1 , wherein the transition zone has a yield strength or a tensile strength, or both, decreasing with a gradient of more than 400 N/mm 2  per 1 cm. 
     
     
         22 . The side rail of  claim 1 , wherein the heat treatment of the first region includes heating to a heat-up temperature, holding the heat-up temperature during a holding time, and cooling down from the heat-up temperature in at least two phases. 
     
     
         23 . The side rail of  claim 22 , wherein the heat-up temperature ranges between 500° C. and 900° C. 
     
     
         24 . The side rail of  claim 22 , wherein the first region is heated to the heat-up temperature at a time interval of up to 30 seconds. 
     
     
         25 . The side rail of  claim 22 , wherein the first region is heated to the heat-up temperature at a time interval of up to 20 seconds. 
     
     
         26 . The side rail of  claim 22 , wherein the first region is heated to the heat-up temperature at a time interval of up to 10 seconds. 
     
     
         27 . The side rail of  claim 22 , wherein the first region is heated to the heat-up temperature at a time interval of up to 5 seconds. 
     
     
         28 . The side rail of  claim 22 , wherein the holding time is up to 30 seconds. 
     
     
         29 . The side rail of  claim 22 , wherein the holding time is up to 20 seconds. 
     
     
         30 . The side rail of  claim 22 , wherein the holding time is up to 10 seconds. 
     
     
         31 . The side rail of  claim 22 , wherein the holding time is up to 5 seconds. 
     
     
         32 . The side rail of  claim 22 , wherein a first phase of the two cooldown phases has a duration which is longer than a duration of a second phase of the two cooldown phases. 
     
     
         33 . The side rail of  claim 32 , wherein the duration of the second phase is up to 120 seconds. 
     
     
         34 . The cross member of  claim 32 , wherein the duration of the second phase is up to 60 seconds. 
     
     
         35 . A side rail assembly, comprising
 a side rail made of a sheet steel, said side rail having a first region which underwent heat treatment, a second region which is not heat-treated, and a transition zone between the first and second regions, said transition zone defined by a width which is smaller than or equal to 50 mm; and   an additional component coupled to the side rail.   
     
     
         36 . The side rail assembly of  claim 35 , wherein a coupling region between the side rail and the additional component has at least one area which is heat-treated after coupling.

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