Jounce Bumper Application Profile  

Jounce bumper_image

Application Description:

A jounce bumper is part of a vehicle’s shock-absorber system designed to absorb impact and dampen noise, vibration and harshness (NVH).

Features and benefits:

• Cost savings, in particular through the adoption of Ossberger process manufacturing and a thermoplastic design including multifunctional integration as a dust cover;

• Constant deflection at high loads, even when subjected to various ageing conditions including fatigue tests;

• No significant lateral expansion under compression stress. No need of saturation cup;

• Excellent performance at very low temperature, even under wet conditions. Non-significant moisture absorption;

• Durable fastening;

And keeping usual features of automotive jounce bumper:

• Low compression set;

• High energy absorption with progressive response;

• Low impact noise;

• High abrasion resistance;

• High chemical resistance (ozone, oils, greases, aliphatic hydrocarbons, hydrolysis, zinc chloride, etc.);

Unique Blow-molding design:

DuPont has patented a Jounce Bumper design made in Hytrel® allowing a significant cost reduction to replace incumbent foam polyurethane (PUR).

Using non-linear Finite Element Analysis (FEA) and Expert System software developed by DuPont, the Jounce Bumper design can be tailored to specific OEM/vehicle static and dynamic requirements of the OEM.

Hytrel® provides stiffness, elasticity and durability required for this application.

DuPont Inclusive Application Development

DuPont can support and collaborate with OEMs, Tier 1 suppliers and molders at all stages of the development phases.

This support includes:

• Design using FEA techniques and specialist software

• Processing, including rapid prototyping

• Laboratory testing at the DuPont European Technical Center

• Vehicle road tests, with an independent automotive dynamic analysis road center:

DuPont can evaluate and optimize the Jounce Bumper design based on vehicle road tests according to multiple criteria and driving conditions.