Which seatbelt component uses multiple torsion bars in the retractor. The torsion bar is one of them. Overall, it represents an important advancement in vehicle safety technology. It is composed of torsion bar 1, fixed shaft 2 and rotating shaft 3. The analysis in this paper does not evaluate the load required to turn the torsion bar. Figure 16c is a graph showing the energy absorption rates as a function of twist deformation of the torsion bar and torque of the seatbelt retractor having a multi load level torsion bar as shown in Figures 1-7 having the transition from high energy load rate to low energy absorption rate in a dashed line with the improved outer sheath bonded to a two piece torsion bar as shown in Figures 8-14 A seat belt retractor (20) comprising: a spool (30) having a determinable amount of seat belt stored thereon and a torsion bar (50), the torsion bar including first and second end formations (52b and 52a), the first one of the end formations (52b) is drivingly connected to the spool; the torsion bar further includes a ductile, elongated body DE 196 53 510 A1 teaches the use of a torsion bar as an energy absorber in a belt reel of a seat belt retractor. Apr 2, 2022 · The most common type of seat belt system is the three-point belt system with a roller retractor, belt tensioner and torsion bar as a force limiter [4]. The belt force limiter reduces the force of the seat belt above a certain threshold and, in conjunction with belt tensioners and airbags, lessens the risk of upper body injuries being caused to front passengers. We have selected the following materials: carbon steel, cast stainless steel, cast low alloy steel and cast aluminium alloy. A mechanism that automatically undoes the seatbelt in a collision C. This helps to enhance safety by reducing the risk of injury during an accident. A mechanism that automatically tightens the seat belt around you )B. The load limiter maintains tension in the seatbelt, reducing injury to the passenger's chest. (54) SEAT BELT RETRACTOR HAVING A TORSION BAR GURTAUFROLLER MIT TORSIONSSTAB RETRACTEUR DE CEINTURE DE SECURITE A BARRE DE TORSION (84) Designated Contracting States: ATBECHCYDEDKESFIFRGBGRIEITLILU MC NL PT SE (30) Priority: 13. This helps prevent injuries (even internal organ injuries) to the passenger. Jan 1, 2023 · This paper examines the use of various materials for the force limiter torsion bar found in an automotive seat belt assembly. May 24, 2016 · Load limiter allows the belt or webbing to extend a bit more when a great deal of impact is applied on it. (A) Initial state (B) Pretensioner operates (C) Load limiter Apr 30, 2025 · Question 9 of 15 Which seatbelt component uses multiple torsion bars in the retractor to allow different levels of seatbelt release based on passenger body size and collision severity? A) Retractor B) Adaptive load limiter C) Locking tongue mechanism D) Pretensioner Aug 2, 2022 · The window of purported seat belt torsion bar benefit occurs when the occupant is perfectly aligned and is moving into a deploying airbag. We have selected the following materials: carbon steel, cast stainless Apr 20, 2009 · The angle of the grain lines in the surface of the twisted bars was then used to calculate the amount of twist for each bar. Apr 29, 2025 · Torsion Bar. Kg: Belt winder for a vehicle occupant seat belt US6065706A (en) * 1998-04-14: 2000-05-23: Breed Automotive Technology, Inc. Apr 26, 2024 · In this article, we’ll delve into the components of a seat belt (with a focus on pretensioners), their function, and how they work with the entire seat belt system to deliver a safer driving experience. Torsion bars were then twisted statically and dynamically in retractor tests to validate the methodology developed. Multi-level load limiting torsion bar retractor US6416007B1 (en) * 1998-02-23: 2002-07-09: Trw Occupant Restraint Systems Gmbh & Co. The present invention pertains to a seat belt retractor for accommodating a seat belt to be retracted and withdrawn, and more particularly, to a torsion bar used in a seat belt retractor as a force limiter mechanism (hereinafter, sometimes referred to as EA mechanism) for limiting the load exerted on the seat belt. Seat belt pretensioners are used to eliminate small amounts. components are minimized. May 24, 2016 · The best way to achieve this is by integrating a torsion bar with the retractor mechanism. 1998 US170409 (43) Date of publication of application: 01. The innovative system uses a plastic piston instead of conventional metal components to transfer tensioning torque through the torsion bar to the spool, resulting in a simpler design, more compact packaging and industry leading system weight. Energy absorbing seat belt retractor having a torsion bar If the load placed on a seat belt exceeds the predetermined level, the torsion bar is twisted to allow the seat belt to be pulled out, thus lessening the load imposed on the belt wearer’s chest. A two sided torsion bar (200) for generating at least first and second levels of reaction torque on the spool permits the spool to rotate in a controlled manner in a belt This paper examines the use of various materials for the force limiter torsion bar found in an automotive seat belt assembly. Newer seatbelts have a torsion bar in place of the retractor shaft. depowered load torsion bar activated for 5th percentile passengers, digressive load limiter activated for 95th percentile Apr 20, 2009 · The front seat occupant seat belt systems studied contained both retractor pretensioners and retractor torsion-type force limiters. The way a torsion bar operates is that when the seat belt retractor locks up during a crash, the continuing loads on the shoulder belt will cause the torsion bar to twist and rotate and pay out seat belt webbing. The torsion bar is attached to the locking mechanism on one end and the spool on the other end. A seat belt consists of several components, including: Webbing (the fabric strap) Buckle; Retractor (spring-loaded Jan 13, 2022 · Figure 2 shows a load limiting structural model of a retractor. The bar detects when the pull of the webbing has reached a critical load; the seatbelt then loosens just slightly. A tool to help install a car seat D. In a load limiter, the torsion bar is secured to the locking mechanism on one end and the rotating spool on the other. In a less severe accident, the torsion bar will hold its shape, and the spool will lock along with Aug 1, 2022 · The primary purpose of the torsion bar is to reduce the loads applied to the occupant by the shoulder belt portion of the seat belt. In order to achieve this, a torsion bar in the belt retractor distorts under load. S. The two ends of the torsion bar 1 are respectively processed with external splines, and the internal parts of the fixed shaft 2 and the rotating shaft 3 are respectively processed with internal splines. The spindle is used to wind up and store the webbing. Posted by u/HungryCowsMoo - 194 votes and 46 comments The Seat Belt System and How It Works Seat Belt System Components Your Honda has lap/shoulder seat belts for the driver and the passen-ger. Jun 13, 2025 · The Adaptive Load Limiter is a component in seatbelt systems that utilizes multiple torsion bars to adjust the level of seatbelt release, depending on passenger size and collision severity. 08. In order to connect the torsion bar in a non-rotatable manner with a lockable part of the belt reel, for instance a toothed disk and with a belt reel part which can be rotated in the case of overloading, gears are located on the two ends and/or in the bar region between the two ends Sep 1, 2023 · LLA will have two torsion bars (depowered and digressive) together. roadways where at least one airbag deployed. Your seat belt system also includes a light on the instrument panel to remind you to fasten your seat belt, and to make sure your passenger fastens his. The torsion bar is formed as a cold headed extruded part with the grain structure of the metal aligned in the axial direction of the torsion bar in the center of the bar and the grain structure smoothly diverges from the axial direction near an end formation (52a, b) of the torsion bar. The crashes that were analyzed occurred on U. There are several types of designs to provide the constant belt force by retractors. And the seatbelt adjuster changes the position of the shoulder strap to suit different body sizes. Once the seat belt pretensioner has been activated, the seat belt retractor remains locked. This process needs to occur early in the crash in order to couple the occupant to the decelerating vehicle and provide the most controlled ride-down. A torsion bar is just a length of metal material that will twist when enough force is applied to it. Feb 23, 1998 · Constant force retractors are a new type of seat belt retractors which, during a crash, can generate nearly constant belt restraint forces on occupants required by advanced restraint systems. In fatal accidents, 75 % of the vehicle occupants were thrown out of the car in the crash [5]. The best way to achieve this is by integrating a torsion bar with the retractor mechanism. 2001 Bulletin2001/31 (73) Proprietor:Breed Automotive Jan 12, 2018 · Pretensioner Retractor) seat belt system to the Jeep Wrangler. 10. A retractor is a standard component of a seat belt restraint system which includes a spindle receiving the webbing material of the seat belt. Any slack in the seat belt works against this process. Apr 29, 2023 · More advanced load limiters rely on a torsion bar in the retractor mechanism. Seat Belt Components. However, it is clear that problems may arise if the torsion bar is allowed to deploy during non-frontal crashes where the frontal airbag does not normally deploy, or the occupant bypasses the airbag due to Jun 13, 2025 · Question 9 of 15 Which seatbelt component uses multiple torsion bars in the retractor to allow different levels of seatbelt release based on passenger body size and collision severity? A) Retractor B) Adaptive load limiter C) Locking tongue mechanism D) Pretensioner Seatbelt Force Limiter. A torsion bar (50) in a seat belt retractor (20) has a circular cross section. Seat belts have also been shown to reduce the risk of injury by up to 70 % [6]. An energy absorbing retractor having a frame (22), locking mechanisms (56, 60, 60a, 66, 66a) to initially stop a spool (30) from rotating in a belt protraction direction and bias means (80) to retract the seat belt. Generally, the spindle is locked in place upon detection at a potential accident situation in order to restrain the occupant via the seat belt. This light comes on when you turn on the ignition if you The pretensioner tightens the seatbelt instantaneously during a collision, holding passengers more firmly in their seats. egfaxwj dajp sbfie zoibnmou snw ciwpodul dcaj aogh mwtdph rlve