Head Restraint Component

By Justin Gonzalez,2014-06-06 10:36
11 views 0
Head Restraint Component

    Head Restraint IWG Document: HR-1-4

    Comparison of Head Restraint Regulations FMVSS 202

    (Current standard, Final Rule, and ECE 17)Head Restraint U.S. – FMVSS 202 US FMVSS 202 ECE 17Comments

    Component(current)Final Rule

    A. Application

    1. Vehicles

    Front outboard seating Front outboard and rear Front outboard and rear -If HR present in rear

    positions in passenger outboard (optional) (optional) seating seat, ECE 17 and 202

    cars, MPVs and trucks seating positions in positions in vehicles of Final Rule regulates.

    passenger cars, MPVs categories M1 and N, -ECE 17 regulates rear with a GVWR ? 4536 kg

    and trucks with a GVWR and of vehicles of center head restraints if

    categories M2 and M3, available.? 4536 kg, with added

    not covered by exclusion for seating

    Regulation No. 80position adjacent to aisle

    on buses (more than 10


    2. Requirements

    a. Height

     1. Front outboard

     A. FixedAt least 700 mm above Increased to 800 mm Same height as FR, but Different seat set-up

    H-point as measured above H-point and measured from R-point. and measuring

    parallel to the torso measured with a SAE Seat back angle is 25 techniques used.

    reference line. J826 manikin. Seat back degrees or manufacturer

    angle set at 25 degrees. specified. Seat cushion

    Seat cushion at highest at lowest position


     B. AdjustableSame as 202-fixedMust achieve a height of Same height as FR, but Different seat set-up

    800 mm and cannot be measured from R-point and measuring

    adjusted below 750 mm. and at manufacturer’s techniques used.

    Measured with a SAE suggested angle or 25

    J826 manikin. Seat back degrees. Seat cushion in

    angle set at 25 degrees. highest position.

    Seat cushion in highest



    February 14, 2005

    Head Restraint IWG Document: HR-1-4Head Restraint U.S. – FMVSS 202 US FMVSS 202 ECE 17Comments

    Component(current)Final Rule

    (202 Final Rule: Rear head restraint means a rear seat back, a. Height (cont.)or any independently adjustable seat component attached to or 2. Rear outboard adjacent to a seat back, that has a height equal or greater than

    700 mm, in any position of backset and height adjustment.)

     A. FixedNot specifiedIf provided, minimum If provided, same height Different seat set-up

    height of 750 mm above as FR, but measured and measuring

    H-point. Measured with from R-Pointtechniques used.

    SAE J826 Manikin.

     B. AdjustableNot specifiedIf provided, no If provided, same as FR, Different seat set-up

    adjustment below 750 but measured from R-and measuring

    mm from H-point. Pointtechniques used.

    Measured with SAE

    J826 Manikin.

     3. Rear Center

    Not specifiedNot specified If provided, minimum

    height of 700 mm above


    b. Backset

     1. Front outboard Not specifiedBackset limited to a No backset specified, but Different seat set-up positionsmaximum 55 mm as there is a general and measuring

    measured with HRMD. requirement for the seat techniques used.

    Head restraint in at any back angle to be set at

    height adjustment manufacturer’s

    between 750 and 800 suggested angle or 25

    mm, inclusive. Seat degrees and the seat

    back angle set at 25 cushion to be in the

    degrees. Seat cushion at lowest position.

    highest position.


    February 14, 2005

    Head Restraint IWG Document: HR-1-4

    Head Restraint U.S. – FMVSS 202 US FMVSS 202 Final ECE 17CommentsComponent(current)Rule

    c. Width

     1. Front outboardMinimum of 171 mm on Minimum of 170 mm on Minimum of 170 mm for US requires wider HRs

    single seats and 254 mm single seats (outboard all seat types. on front outboard seats

    on bench seatsseats with no seat in with a center seat

    between) and 254 mm on between them.

    bench seats (outboard

    seats with seat in


     2. Rear outboardNot specifiedIf provided, minimum of If provided, minimum of

    170 mm for all seat types170 mm.

    d. Height of adjustable head restraint front


    Not specifiedNot specifiedMinimum height of 100


    e. Gaps

     1. All outboard Not specifiedIn all positions, gap -In lowest position, gap -ECE 17/25 does not positionsbetween HR and seat specify load placed on is ? 25, with no reference

    back and within the HR the sphere to measure to backset adjustment. ? 60 mm. A 165 mm Measured along straight

    -ECE 17/25 measures sphere is pressed against line between HR and seat

    the gap between the HR the gap with a load no back.

    in the lowest position more than 5 N -In other positions the

    and seat back gap ? 60 mm as

    differently from the measured with 165 mm

    gaps in the HR. dia. sphere.

    -Larger gaps allowed -Gaps larger than 60 mm

    by ECE, but must be are allowed if they pass

    tested. the energy absorption



    February 14, 2005

    Head Restraint IWG Document: HR-1-4

    Head Restraint U.S. – FMVSS 202 US FMVSS 202 ECE 17CommentsComponent(current)Final Rule

    f. HR Adjustment Retention Devices (locks)

     1. HeightNot specifiedMust maintain height in If adjustable, requires ECE has no downward

    highest position and at automatic locking system testing requirement.

    800 mm and 750 mm for (ECE 17, 5.1.1). No

    front and rear seats (if downward test required.

    HR provided),

    respectively, while a

    downward force is

    applied. Seat back is

    rigidly constrained.

     2. BacksetNot specifiedUnder applied rearward Not specified.

    moment, while adjusted

    to 800mm for front and

    750mm for rear (if

    provided), HR must

    maintain any position of

    backset adjustment. Seat

    back is rigidly


    g. Removability

     1. FrontNot specifiedCan be removed with Same as 202 FR

    deliberate action distinct

    from any act necessary

    for adjustment.

     2. RearNot specifiedCan be removed with Same as 202 FR

    deliberate action distinct

    from any act necessary

    for adjustment.


    February 14, 2005

    Head Restraint IWG Document: HR-1-4Head Restraint U.S. – FMVSS 202 US FMVSS 202 Final ECE 17Comments


    h. Clearance

    Not specified25 mm clear space If HR provided, 25 mm -In ECE the 25 mm gap

    allowed where rear HRs, clear space allowed is measured from any

    when seat is occupied, where interference with vehicle structure, not

    interfere with roofline or vehicle structure. Seat just roofline or rear

    rear window. does not need to be window as in FR.

    occupied. Minimum -ECE requires a

    height of 700mm must minimum seat height if

    be maintained.HR is present. FR

    defines a rear HR as

    having a height greater

    than 700 mmi. Non-use positions

     1. FrontNot specifiedNot allowedAllowed, provided HR

    automatically returns to

    proper position when

    seat is occupied.

     2. RearNot specifiedAllowed, provided HR Allowed as long as non-US rule defines “clearly

    automatically returns to use position is “clearly recognizable” as being

    proper position when recognizable to the rotated forward or

    seat is occupied or the occupant”.rearward 60?.

    HR is rotated a minimum

    of 60? forward or


    j. Radius of Curvature

    Not specifiedIn NPRM, requirement Parts of front and rear of Deleted in FR because

    was same as ECE 17. HR shall not exhibit a enforcement outweighs

    Requirement was deleted radius of curvature less benefits.

    in final rule.than 5 mm.No commenter had info

    to support reg.


    February 14, 2005

    Head Restraint IWG Document: HR-1-4Head Restraint U.S. – FMVSS 202 US FMVSS 202 Final ECE 17Comments


    k. Energy Absorption

    Not specifiedFront of HR impacted Similar to FR: Uses Tests in ECE and FR

    with head form at v=24.1 pendulum impactor with are functionally

    km/h. 3ms deceleration same weight and equivalent. Except FR

    of head form must not velocity as linear does not test rear of

    exceed 80gs . Impactor impactor. Front and rear HR.

    is linear head form with of HR tested.

    mass of 6.8 kg.

    l. Displacement Test Procedures

    Load is applied to back Test procedure modified Same load and FR provides a detailed

    pan of seat, load is from 202. Seat back and displacement test procedure,

    applied to head restraint HR loaded together. requirements as FR.including load hold

    after seat load is removed. Moments and times.

    102 mm of displacement displacements same.

    allowed with 373 Nm Maximum load the same,

    moment. Load is seat back cannot fail.

    increased until 890N or Use spherical form to

    seat back fails. Use apply load

    spherical or cylindrical

    form to apply load.

    m. Dynamic sled test (optional)

     Seat accelerated so the New corridor based on Not specified

    pulse falls in a corridor scaled version 208 sled

    defined by 2-? sine test. Target pulse the thwaves with amplitudes of male same as 202. 502278 m/sdummy used in any seat, and 86 m/s.

    HR adjusted midway Corridor cannot be met. thbetween lowest and 95 male dummy used,

    highest position and any max rotation 45?.

    backset position. 12?

    max rotation.


    February 14, 2005

Report this document

For any questions or suggestions please email