TRW Launches Its Next Generation Seat Belt Pretensioner

Dec 06, 2010, 10:08 ET from TRW Automotive Holdings Corp.

KARLSRUHE, Germany, Dec. 6, 2010 /PRNewswire/ -- TRW Automotive Holdings Corp. (NYSE: TRW), the global leader in active and passive safety, has launched its next generation seat belt pretensioner to offer weight and packaging advantages to its worldwide customers.  The SPR4 (Snake Pretensioner Retractor) uses a plastic piston instead of conventional metal components to transfer tensioning torque, resulting in a simpler and lighter weight design as well as more compact packaging. 

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Harald Lutz, director engineering, TRW seat belt systems said: "The pyrotechnical seat belt pretensioner has been an established product for nearly 30 years, but TRW has taken this concept to a new level. Based on our proven production seat belt retractor (ESA 4.0), the SPR4's design is simplified and a new tensioning concept transfers power without limiting functionality."

When vehicle sensors trigger the seat belt system, a pyrotechnical gas generator is ignited releasing a 'green gas' which expands and builds up pressure in the guiding tube. This pressure acts on the snake-like plastic piston which is forcefully propelled in to a pinion instead of the usual steel balls. The pinion then transmits a significant torque to the belt retractor spool to pre-tension the seat belt. The whole process takes just ten milliseconds.

Lutz added: "Seat belt pretensioners need to generate tensioning torque quickly, accurately and reliably with a stable level of force and the innovative concept allows for this."

The new design offers vehicle manufacturers a number of advantages compared with existing systems.  The lighter weight, plastic material allows the tensioning force to be generated more quickly than conventional systems. Secondly, the damping behavior of the plastic snake allows the initial peak when impacting the pinion to be significantly lower compared to conventional systems where two rigid steel elements impact on each other. This also results in less wear on the SPR4's components.

Moreover, the green gas shows favorably low variation over the temperature range and works reliably through a wide range of conditions.

The design of the SPR4 offers vehicle manufacturers greater flexibility in terms of packaging and space as it consists of only four main components: the piston, the gas generator, the tube and the pinion. The tube is bent into the dimensions of the retractor without constraining the seat belt webbing helping to further minimize installation space.

TRW's ESA 4.0 has been in production since 2001 on a number of key vehicle platforms. The new SPR4 will be ready for production in 2013.

About TRW

With 2009 sales of $11.6 billion, TRW Automotive ranks among the world's leading automotive suppliers. Headquartered in Livonia, Michigan, USA, the Company, through its subsidiaries, operates in 26 countries and employs over 60,000 people worldwide.  TRW Automotive products include integrated vehicle control and driver assist systems, braking systems, steering systems, suspension systems, occupant safety systems (seat belts and airbags), electronics, engine components, fastening systems and aftermarket replacement parts and services.  All references to "TRW Automotive", "TRW" or the "Company" in this press release refer to TRW Automotive Holdings Corp. and its subsidiaries, unless otherwise indicated.  TRW Automotive news is available on the internet at

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This release contains statements that are not statements of historical fact, but instead are forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. We caution readers not to place undue reliance on these statements, which speak only as of the date hereof.  All forward-looking statements are subject to numerous assumptions, risks and uncertainties which can cause our actual results to differ materially from those suggested by the forward-looking statements, including those set forth in our Report on Form 10-K for the fiscal year ended December 31, 2009 (our "Form 10-K") and our Form 10-Q for each of the quarters ended April 2,  July 2, and October 1, 2010, such as: any shortage of supplies adversely affecting us; commodity inflationary pressures adversely affecting our profitability or supply base; disruptions in the financial markets adversely impacting the availability and cost of credit negatively affecting our business; any further material contraction in automotive sales and production adversely affecting our results, liquidity or the viability of our supply base; pricing pressures from our customers adversely affecting our profitability; the loss of any of our largest customers materially adversely affecting us; costs of product liability, warranty and recall claims and efforts by customers to adversely alter contract terms and conditions concerning warranty and recall participation; costs or liabilities relating to environmental, health and safety regulations; strengthening of the U.S. dollar and other foreign currency exchange rate fluctuations impacting our results; any increase in the expense of our pension and other postretirement benefits or the funding requirements of our pension plans; risks associated with non-U.S. operations, including foreign exchange risks and economic and political uncertainty in some regions; work stoppages or other labor issues at our facilities or at the facilities of our customers or suppliers; assertions by or against us relating to intellectual property rights; the possibility that our largest stockholder's interests will conflict with our or our other stockholders' interests; and other risks and uncertainties set forth in our Form 10-K and in our other filings with the Securities and Exchange Commission. We do not undertake any obligation to release publicly any update or revision to any of the forward-looking statements.

SOURCE TRW Automotive Holdings Corp.