US 12,281,682 B2
Dual rate jounce bumper and a vehicle comprising the same
Tomasz Zylinski, Wyandotte, MI (US); and Timothy J Smith, Wyandotte, MI (US)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/754,086
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Sep. 24, 2020, PCT No. PCT/EP2020/076650
§ 371(c)(1), (2) Date Mar. 23, 2022,
PCT Pub. No. WO2021/058614, PCT Pub. Date Apr. 1, 2021.
Claims priority of provisional application 62/906,173, filed on Sep. 26, 2019.
Claims priority of application No. 19208622 (EP), filed on Nov. 12, 2019.
Prior Publication US 2022/0364622 A1, Nov. 17, 2022
Int. Cl. F16F 9/58 (2006.01); B60G 11/54 (2006.01); F16F 1/371 (2006.01)
CPC F16F 1/3713 (2013.01) [B60G 11/54 (2013.01); F16F 9/58 (2013.01); B60G 2202/312 (2013.01); B60G 2204/125 (2013.01); B60G 2204/4502 (2013.01); B60G 2206/7104 (2013.01); B60G 2206/72 (2013.01); F16F 2224/0208 (2013.01); F16F 2224/025 (2013.01); F16F 2234/02 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A dual-rate jounce bumper for limiting a jounce travel between a first component and a second component of a vehicle, with the second component spaced from and moveable towards the first component along a jounce axis, said dual-rate jounce bumper comprising:
a bumper having a first end for coupling to the first component and a second end spaced from said first end for contacting the second component, with said bumper compressible between the first component and the second component for limiting jounce, with said bumper radially expandable as said bumper is compressed, and
an outer member, disposed about said bumper and capable of limiting the radial expansion of said bumper as said bumper is compressed, for increasing a stiffness of the bumper,
wherein said outer member is obtained by overmolding stainless-steel with a thermoplastic polyurethane having a shore hardness ranging from a Shore D hardness of 50 to a Shore D hardness of 80, determined according to ASTM D2240-15e1,
wherein the thermoplastic polyurethane is obtained by reacting:
a polyol, an isocyanate, and optionally, a chain extender,
wherein the polyol comprises a polyether polyol,
wherein the polyether polyol has an average functionality in between 1.9 to 2.1 and a hydroxyl number in between 10 mg KOH/g to 500 mg KOH/g,
wherein the isocyanate comprises an aliphatic isocyanate or an aromatic isocyanate, and
wherein the aromatic isocyanate comprises methylene diphenyl diisocyanate and/or polymeric methylene diphenyl diisocyanate.