Armada Rubber Mfg. Co.

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Armada Rubber Mfg. Co.

• Expert System

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Table of Contents

• Head type suggestions for the application
• Armada Rubber head (types)
• Interior Bumpers
• - Ashtrays
• - Glove box
• - Console
• - Grab handles
• Exterior Bumpers
• - Fuel filler door
• - Hood and Deck Lid
• - Door handles
• - License plates
• Recessed Bumpers
• Suggestions for design correcting BSR issues
• Installation notes
• Hole Plugs
• Grommets
• Caps
• Line Plugs

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Head type suggestions for the application

• Due to the number of variables involved i.e.
  durometers, materials, and geometry there is no
  formula to predict load deflections or closure
  forces involved. It is important to understand
  the does not compress but had to deflect from its
  original shape. The following might be helpful
  in determining the desirable geometry of the head
  (type) for the application. Look at the bumper
  listing in the Armada Rubber mold listing book to
  get a better visual of the head (types) explained
  on the following page(s).

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Armada Rubber head (types)

• Type 1) Similar to type 3 with minimal
  deflection. These are generally shorter in head
  height.
• Type 2 5) Have smaller contact patches
  and allow greater deflection than either types
  1,3 or 4.
• Type 3) Has the least amount of
  deflection, generally specified to hold large
  trim or panels stable under greater load forces.
  This (type) has a large contact patch, which is
  used in many instances as overslam bumpers. This
  (type) quickly absorbs energy and protects
  components from over-travel. NOTE The strength
  of the sheet metal is important so that the load
  put on the bumper does not bend the metal.

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Armada Rubber head (types) cont.

• Type 4) Gives greater stability for areas
  needing taller bumpers with some degree of
  deflection.
• Type 6) Conical Hollow Head design
  deflects easily and has a more linear compression
  curve, allowing for a wider range of design gap.
  This is generally softer and quieter, which works
  well in interior applications. This head design
  is good for interior applications such as
  consoles and glove boxes.

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Interior Bumpers - 1) Ashtray Bumpers

• 1) Determine trim and finish line which will
  determine the gap between the closure and the
  fixed dimension
• 2) Check allowable geography for maximum
  diameter of bumper head along with location of
  hole and allowable hole size to fasten the bumper
  either to the closure or the fixed dimension.
  Hole sizes should be line-to-line with the neck
  of the bumper.
• 3) The bumpers groove thickness should be
  line-to-line or slightly smaller than the
  material thickness.
• 4) Pull-thru bumpers are preferred if there
  is enough room for installation. If there isnt
  enough room for a pull-thru bumper then try a
  push-in bumper. Note push-in bumpers require an
  installation tool. Pull-thru or push-thru are
  subject to assembly preferences.

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Interior Bumpers - 2) Glove box

• 1) Determine the gap between the closure and
  fixed dimension.In general add 15 to the gap
  distance which will determine the head height of
  the bumper. This will create a slight
  interference fit, compressing the bumper.
• 2) Check allowable geography for maximum diameter
  of bumper head along with location of hole and
  allowable hole size. Hole size should be
  line-to-line with the neck of the bumper or
  slightly larger.
• 3) The bumpers groove thickness should be from
  line-to-line with material thickness or smaller
  (generally up to 1.0 mm for softer rubber).
• 4) Pull-thru bumpers are preferred if assembly
  allows room for the tail to be pulled through
  from the backside. If there is not enough room
  for a pull-thru bumper than think about a push-in
  bumper. Push-in bumpers do require a tool for
  installation.
• 5) For glove box applications the Hollowhead
  bumper works best and are tolerant of a wide
  range of deflection/ gap filling without
  significantly increasing closure efforts.

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Interior Bumpers - 3) Console Bumpers

• 1) Determine the gap between the closure and
  fixed dimension. In general add 15 to the gap
  distance which will determine the head height of
  the bumper.
• 2) Check allowable geography for maximum diameter
  of bumper head along with location of hole and
  allowable hole size to fasten bumper either to
  the closure or the fixed dimension.
• 3) The bumpers groove thickness should be from
  line-to-line with material thickness or smaller
  (generally 1.0 mm for softer rubber material).
• 4) If the assembly allows room to pull the tail
  of the bumper into the mounting hole from the
  backside of the assembly a pull-thru bumper would
  be easiest. If this is not applicable then a
  push-thru bumper should be looked at. Note
  push-thru bumpers do require a tool for assembly.
• 5) For console applications hollow head bumpers
  work well. This type of bumper has a wide range
  of deflection/ gap filling without significantly
  increasing closure efforts. If the console needs
  to take a large load a solid head may be better.

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Interior Bumpers - 4) Grab Handles

• 1) Check allowable geography for maximum diameter
  of bumper head along with location of hole and
  allowable hole size to fasten the bumper. The
  hole size should be line-to-line with the neck of
  the bumper or slightly larger.
• 2) The bumpers groove thickness should be from
  line-to-line with material thickness or smaller
  (generally up to 1.0 mm for softer rubber
  material).
• 3) Typically grab handle bumpers are push-in
  types. If assembly allows room to pull the tail
  of the bumper into the mounting hole from the
  backside of the assembly a pull-thru type bumper
  is easier.

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Exterior Bumpers - 1) Fuel Filler Door

• 1) Determine inside of door and finish line which
  will determine the gap between the closure and
  fuel filler pocket.
• 2) Check allowable geography for maximum diameter
  of bumper head along with location of hole and
  allowable hole size to fasten bumper.
• 3) The bumpers groove thickness should be from
  line-to-line with material thickness
• 4) Typically these bumpers are of the push-in
  type, unless the bumpers can be assembled to the
  pocket as part of that assembly.

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Exterior Bumpers - 2) Hoods and Deck Lids

• 1) Determine trim and finish line which will
  determine the gap between the closure and the
  fixed dimension. Note Build Tolerances - the fit
  should encompass touch condition in the worst
  case.
• 2) Check allowable geography for maximum diameter
  of bumper head along with location of hole and
  allowable hole size to fasten bumper. Hole size
  should be line-to-line with the neck of the
  bumper or slightly larger.
• 3) The bumpers groove thickness should be close
  to line-to-line with material thickness.
• 4) Typically these bumpers are push-in style
  bumpers. Twist-in style bumpers can also be used
  if off - axis impact may cause the bumper to come
  out. The sheet metal must be shaped for the
  installation for the twist-in. Recess bumpers can
  be used as an attachment point, saving assembly
  steps. Contact ARMC/ Rep for recommendation.

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Exterior Bumpers- 2) Hoods and Deck lids (cont.)

• 5) It is important to know how strong the sheet
  metal is so that the bumper wont cause metal
  distortions when contact occurs.
• 6) Typically broad and solid bumpers are chosen
  for these applications.

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Exterior Bumpers - 3) Door Handles

• 1) Check allowable geography for maximum diameter
  of bumper head along with location of hole and
  allowable hole size to fasten bumper. Hole size
  should be line-to-line with the neck of the
  bumper or slightly larger.
• 2) The bumpers groove thickness should be from
  line-to-line with the material thickness.
• 3) Typically these bumpers have solid heads
  because they dont have to take up distortions.
• 4) Pull-thru style bumpers are easier for
  installation. If the assembly allows room to pull
  the tail into the mounting hole from the backside
  of the assembly Pull-thru style bumpers are
  preferred. If there isnt enough room for a
  pull-thru bumper than a push-in bumper can be
  applied.
• 5) Due to more stringent crash test requirements,
  spring forces have been increased. See Armada/Rep
  for details.

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Exterior Bumpers - 4) License plates

• 1) Determine the gap between the plate and fixed
  dimension.
• 2) Check allowable geography for maximum diameter
  of bumper head along with location of hole and
  allowable hole size to fasten to the closure or
  fixed dimension. Hole size should be line-to-line
  with the neck of the bumper or slightly larger.
• 3) The bumpers groove thickness should be
  line-to-line with material thickness.
• 4) pull-thru style bumpers are easiest for
  installation if the assembly allows room to pull
  the tail of the bumper into the mounting hole
  from the backside of the assembly. If not,
  push-in style bumpers are often used for license
  plate applications.

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Recessed Bumpers

• 1) These bumpers are specifically designed to
  have a fastener installed into them, for example
  ( screw, etc. ).
• 2) If the bumper is to be shipped with the
  fastener in it, there must be restriction between
  the rubber and the fastener so that the fastener
  will stay in the bumper.
• 3) To resist torque damage under a screw head, a
  free spinning washer should be on the screw or
  installed in the bumper recess.

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Suggestions for design correcting BSR issues

• Checking for Trim Line
• 1) Prototype model or existing assemblies -
  get math data showing nominal positions. You
  should understand tolerances.
• 2) Testing head heights and style for trim
  line and closure force for existing assemblies.
  After determination of style and type along with
  approximate head height select a group of Armada
  bumpers from the bumper listing. Contact
  representative or Armada directly for available
  parts. Do not rule out bumpers that are not
  optimal for existing hole size and substrate
  thickness. Objective is to determine head height
  and type. Can modifications be made to mounting
  surface to accommodate bumpers preference? If
  not, hand trim bumper retainer to test head
  height and type or remove head from bumper and
  mount head with double sided tape to surface.

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Installation Notes

• 1) Insertion tools for push-in bumpers should
  have a diameter 25- 50 smaller than the
  insertion hole and should be able to stretch the
  neck of the part about 100. The tip should be
  ground to a full radius to avoid puncturing the
  carrot. If a die roll is built into the substrate
  it will make the bumper much easier to install
  and still difficult to remove.
• 2) When designing a bumper the insertion hole
  should extend at least half way into the
  retainer. This will allow for the insertion tool
  to stretch the retainer far enough for easier
  installation.
• 3) If installation is difficult try using soapy
  water, so that the bumper will slide in easier.

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Hole Plugs

• 1) There are two styles of hole plugs, so you
  need to determine which style works best for the
  application. On-plane sealing -
  this style has a mushroom shaped head that seals
  the hole. This plug works well for off-plane
  distortions or hole distortions.
• Radial sealing in the through hole - This
  plug has a diameter interference fit of 1 to 2 mm
  depending on the hole you are plugging.

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Grommets

• 1) Grommets act as isolators or protect a part
  that travels through them.
• 2) The dimensions of a grommet must be close to
  that of the substrate it will be installed into.
• 3) Some grommets do accommodate metal
  distortions.
• 4) Typically 1.5 mm is the minimum thickness on
  the wall of a grommet.
• 5) Armada makes grommets in one piece and can
  split the grommet for certain applications.
• 6) Grommets for mounting applications such as ABS
  units mounted to the bracket and vehicle are
  critical for noise and vibration abatement.

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Caps

• 1) Caps can be used to either keep fluid from
  flowing in or out of an area, can be used as a
  bumper, or as a stand off.
• 2) When designing a cap the thickness of the
  rubber should be no less than 1.5 mm.
• 3) Interference between the I.D. and O.D. should
  be 10 - 15.
• 4) Installation efforts can be reduced by using
  soapy water.

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Line Plugs

• 1) Line plugs require interference between parts
  for the plug to retain. This interference occurs
  between the inside diameter of the substrate and
  the outside diameter of the line plug.

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Materials

• On the following page is a chart to help you
  select the correct type of rubber compound for
  your application. The chart will tell you how
  each compound responds under different conditions.

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