Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
  • F16D69/04—Attachment of linings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D65/00—Parts or details
  • F16D65/02—Braking members; Mounting thereof
  • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
  • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
  • F16D2069/004—Profiled friction surfaces, e.g. grooves, dimples
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
  • F16D2069/005—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure
  • F16D2069/007—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure comprising a resilient layer
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
  • F16D69/04—Attachment of linings
  • F16D2069/0425—Attachment methods or devices
  • F16D2069/045—Bonding
  • F16D2069/0466—Bonding chemical, e.g. using adhesives, vulcanising
  • F16D2069/0475—Bonding chemical, e.g. using adhesives, vulcanising comprising thermal treatment

Definitions

• This invention relates to brakes, and more particularly to the linings to be secured to backing plates to comprise brake elements such as brake blocks, or brake pads, or non-planar brake linings, or the like.
• a brake pad is mounted in a carrier and is slidable forwards and backwards along a guideway in the carrier into and out of a working position in which it can be locked, for engagement with the moving element of a brake system to be retarded or stopped.
• Such pads are used in rail vehicle brake systems, but are in principle usable elsewhere, for example in heavy goods road vehicles. When a lining has become worn or otherwise defective, then by releasing the lock the pad can be slid backwards along the guideway and so withdrawn from the carrier; replacement of a fresh pad is thus facilitated.
• a brake element as referred to above, and comprising a lining secured to a backing plate, in which brake element there is interposed between a layer of friction material of the lining and the backing plate, a relatively soft layer of elastomeric material having a Rockwell value, as defined below, greater than 0.30 millimetre penetration.
• the improved properties resulting from this construction for such a brake element are a result of the layer of elastomeric material making the lining more conformable to the working surface of the moving element, compared with known forms of such linings, and so that the two surfaces engage more uniformly.
• the elastomeric material is required to maintain its physical integrity in use in a brake element in accordance with the present invention, and is required to have a Rockwell value below that of an elastomeric material which would break-up in use in the brake element.
• the elastomeric layer has a Rockwell value of a depth of penetration at least twice that of the friction material.
• the friction material may have a composition including a polymeric binder together with reinforcing fillers and/or binders, and may be entirely conventional, such as for example that described in US 3,227,249, or, if the non-asbestos kind is desired, that described in GB 1,604,827; and may also include fibres.
• the elastomeric layer may likewise vary widely in composition, provided that it is not cured to a degree beyond that at which it becomes so cross-linked as to lose its softness relative to that of the friction material.
• compositions described in Ferodo Limited GB 1 249 922 as being suitable for the manufacture of non-squeal railway brake blocks for direct engagement with the external periphery of a rail vehicle wheel.
• the thickness of the elastomeric layer should be no less than 3 millimetres.
• the ratio of the thickness of the elastomeric layer to that of the layer of friction material is not less than 1:10, particularly not less than 1:5; and a preferred maximum ratio is 1:1.
• the illustrated brake pad is in two parts, each part having a lining 1 secured to a metal backing plate 2 which is of dovetail cross-section.
• the lining 1 has a surface remote from the backing plate 2 which is essentially flat, is to be engaged by a moving element to be retarded or stopped, and is provided by a layer 3 of friction material.
• the moving element to be retarded or stopped may comprise the disc of a disc brake system.
• the backing plate 2 is keyed to the elastomeric layer 4 by tongues pressed out of the plane of the plate, leaving apertures 5 therein.
• the layer 3 of friction material is conventionally grooved, both transversely as at 6 and longitudinally as at 7.
• suitable thicknesses for the layer 3 of friction material 1 and the elastomeric layer 4 are 12 millimetres and 6 millimetres respectively.
• Typical Rockwell values ball diameter 2.54 centimetres, with 30 kilograms major load) are:
• a metal backing plate is shot-blasted to clean it, and adhesive of the kind conventionally used for direct bonding of the lining is applied to the plate and allowed to dry off during 12 hours.
• a sheet of an elastomeric material is prepared by mixing:-
• the mixture is roll milled hot to produce a sheet 8 millimetres thick. This sheet is cut to fit into the die, and is placed on top of the layer of friction material already in the die. .
• the metal backing plate is superimposed on the elastomer layer, and the assembly is pressed under a pressure of 85 megaPascals at ambient temperature for 15 seconds.
• the pads are packed under a pressure greater than 62 kiloPascals, and the assembly is baked in an air-circulation oven for 1 hour at 160°C, plus 1 hour at 200°C and 3 hours at 235°C, to cure both the thin layer of friction material and the layer of elastomer composition. Baking is carried out in packs with metal inserts to prevent undue compression of the elastomeric layer during its cure. Any exudate of elastomer at the assembly sides is then removed by machining. The exposed surface of the friction material is then ground to prepare it for the bonding of further friction material.
• Adhesive is applied to the ground surface and allowed to dry off, and there is then applied to that surface a shaped already - glued slab of friction material 12 millimetres thick which has been made separately from the uncured mix of step 2 ⁇ earlier.
• This final assembly is loaded with others into an air oven and baked for 2 hours at 180°C. 7.
• the baked assembly is finally ground to a total thickness (the layer of friction material plus the layer of elastomeric material) of 18 millimetres, and grooves are then cut in the surface of the layer of friction material by conventional procedure.
• a lining in accordance with the present invention instead of comprising part of a brake pad, may comprise part of a brake block, or a non-planar brake lining, or the like.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Braking Arrangements (AREA)
• Transplanting Machines (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10704747

Family Applications (1)

Country Status (13)

Cited By (1)

Families Citing this family (12)

Citations (8)

Family Cites Families (16)

• 1991
  • 1991-11-15 GB GB9124381A patent/GB2261711B/en not_active Expired - Fee Related
• 1992
  • 1992-11-06 JP JP5509057A patent/JP2886982B2/ja not_active Expired - Fee Related
  • 1992-11-06 CZ CZ941064A patent/CZ282488B6/cs not_active IP Right Cessation
  • 1992-11-06 AU AU28965/92A patent/AU657179B2/en not_active Ceased
  • 1992-11-06 KR KR1019940701072A patent/KR100276066B1/ko not_active Expired - Fee Related
  • 1992-11-06 ES ES92922833T patent/ES2084388T3/es not_active Expired - Lifetime
  • 1992-11-06 EP EP92922833A patent/EP0612383B1/en not_active Expired - Lifetime
  • 1992-11-06 DK DK92922833.6T patent/DK0612383T3/da active
  • 1992-11-06 DE DE69208683T patent/DE69208683T2/de not_active Expired - Fee Related
  • 1992-11-06 WO PCT/GB1992/002055 patent/WO1993010370A1/en not_active Ceased
  • 1992-11-10 ZA ZA928649A patent/ZA928649B/xx unknown
  • 1992-11-12 IN IN1044DE1992 patent/IN185907B/en unknown
• 1995
  • 1995-05-31 US US08/455,249 patent/US5586626A/en not_active Expired - Lifetime

Patent Citations (8)

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