WO2021100009A1 - Patins pour freins de roue - Google Patents

Patins pour freins de roue Download PDF

Info

Publication number
WO2021100009A1
WO2021100009A1 PCT/IB2020/060969 IB2020060969W WO2021100009A1 WO 2021100009 A1 WO2021100009 A1 WO 2021100009A1 IB 2020060969 W IB2020060969 W IB 2020060969W WO 2021100009 A1 WO2021100009 A1 WO 2021100009A1
Authority
WO
WIPO (PCT)
Prior art keywords
block
inserts
matrix
blocks
wheel brakes
Prior art date
Application number
PCT/IB2020/060969
Other languages
English (en)
Inventor
Vittorio De Soccio
Antonio Ricci
Original Assignee
Cofren S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cofren S.R.L. filed Critical Cofren S.R.L.
Publication of WO2021100009A1 publication Critical patent/WO2021100009A1/fr

Links

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
    • F16D69/02—Composition of linings ; Methods of manufacturing

Definitions

  • the invention relates to blocks for wheel brakes with an improved resistance to wear.
  • the aforesaid blocks for wheel brakes are usually used in trains with a medium/low speed (a maximum speed of 160 Km/h), with large masses and subjected to frequent braking, such as city trains.
  • the inventors of this invention unexpectedly found out that, if the block comprises inserts made of a material having a compressibility modulus which is smaller than the one of the material making up the remaining part of the block, a significant wear reduction can be obtained.
  • the technical solution described below offers the great advantage of significantly reducing the wear of the block without affecting the effectiveness of the braking at all, which is also demonstrated by the following analysis of the friction coefficients between the friction surface and the wheel.
  • the subject-matter of the invention is a block for wheel brakes comprising a matrix made of a first material and having one or more inserts included inside said matrix and made of a second material; said one or more inserts (3; 13) made of said second material being arranged in a symmetrical manner relative to a transverse middle plane (X); said block being characterized in that said second material has a compressibility modulus (pressure necessary to compress the material by 1mm) lower than that of said first material by at least a value equal to 10 MPa; said shoe having a friction surface composed of 95 to 60% of said first material and 5 to 40% of said second material; said first material being a sintered material.
  • Said first material preferably has a compressibility modulus ranging from 20 to 40 MPa and said second material preferably has a compressibility modulus ranging from 2 to 15 MPa.
  • - figures 1 and 2 are a side view and a bottom view, respectively, of a first embodiment of a block for wheel brakes according to the invention
  • FIG. 3 and 4 are a side view and a bottom view, respectively, of a second embodiment of a block for wheel brakes according to the invention.
  • FIG. 5 and 6 are two diagrams showing the friction coefficients and the temperature changes of the friction surface detected for two respective blocks of figure 1 subjected to a plurality of braking operations; and figure 7 is a diagram showing the friction coefficients and the temperature changes of the friction surface detected for a comparison block subjected to the same plurality of braking operations as in figures 5 and 6.
  • number 1 generically indicates, as a whole, a block for wheel brakes according to the invention.
  • the block 1 comprises a matrix 2 made of a sintered material (first material) used in the prior art to manufacture the entire block.
  • the block 1 further comprises six inserts 3 with a cylindrical shape, which are made of a material (second material) having a compressibility modulus which is smaller than the one of the first material making up the matrix 2.
  • the inserts 3 are arranged in a symmetrical position relative to a transverse middle symmetry plane X.
  • the block 1 comprises a friction surface 4, which is occupied by said first material for 93% and by said second material for 7%.
  • the inserts 3 two different materials (second material (a) and second material (b)) were alternatively used.
  • the second material (a) is an organic material
  • the second material (b) is a sintered material.
  • Table I shows the physical features of the materials.
  • the second material (a) differs from the first material in terms of compression, in terms of hardness and in terms of density; whereas the second material (b) differs from the first material only in terms of compression.
  • the materials with a different compressibility can also be obtained, besides from materials with a different chemical nature, by means of a different process of preparation of a same chemical type of material. For example, compressibility can be changed by acting upon the porosity of the resulting material.
  • the blocks described above were subjected to a plurality of braking actions both under dry conditions and under wet conditions. For each one of said braking actions, the temperature change of the friction surface of the block, the friction coefficient and the wear of the material were measured. The results are shown in the diagrams of figures 5, 6 and 7.
  • the difference between blocks A and B and the comparison block std lies in the presence of the six inserts 3. In other words, the comparison block std is entirely made of the same material making up the matrix in blocks A and B.
  • Tables II-IV show data concerning the wear of the materials following braking actions to which the respective blocks are subjected, specifically analysing, by way of example, three sample braking actions.
  • Tables II-IV show the energy applied in each single braking action, the wear caused by the single braking action in terms of material reduction volume in cm 3 and also the wear as a function of the energy applied to the single braking action.
  • number 11 indicates, as a whole, a second embodiment of a block according to the invention.
  • the block 11 comprises a matrix 12 made of a sintered material used in the prior art to manufacture the entire block.
  • the block 11 further comprises ten inserts 13 with a cylindrical shape, which are made of a material having a compressibility modulus which is smaller than the one of the first material making up the matrix 12.
  • the inserts 13 are arranged in a symmetrical position relative to a transverse middle symmetry plane X.
  • the materials making up the matrix 12 and the inserts 13 are the same as the ones making up the matrix 2 and the inserts 3.
  • the block 11 comprises a friction surface 14, which is occupied by said first material for 88.5% and by said second material for 11.5%.
  • the difference between the block 11 and the block 1 exclusively lies in the fact that the former comprises 10 inserts made of an organic material instead of 6.
  • the block according to the invention can also assume other configurations, provided that the requirement according to which the relative friction surface 4 consists, for 95 to 60%, of the material making up the matrix is fulfilled.

Landscapes

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

Abstract

L'invention concerne un patin (1 ; 11) pour freins de roue comprenant une matrice (2 ; 12) constituée d'un premier matériau fritté et ayant un ou plusieurs élément(s) rapporté(s) (3 ; 13) inclus à l'intérieur de ladite matrice et constitués d'un second matériau. Le second matériau a un module de compressibilité (pression nécessaire pour comprimer le matériau de 1 mm) qui est plus petit que celui du premier matériau. Le bloc a une surface de frottement (4) constituée du premier matériau pour 95 à 60 % et du second matériau pour 5 à 40 %.
PCT/IB2020/060969 2019-11-21 2020-11-20 Patins pour freins de roue WO2021100009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000021813 2019-11-21
IT102019000021813A IT201900021813A1 (it) 2019-11-21 2019-11-21 Ceppi per freni su ruota

Publications (1)

Publication Number Publication Date
WO2021100009A1 true WO2021100009A1 (fr) 2021-05-27

Family

ID=69904009

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2020/060969 WO2021100009A1 (fr) 2019-11-21 2020-11-20 Patins pour freins de roue

Country Status (2)

Country Link
IT (1) IT201900021813A1 (fr)
WO (1) WO2021100009A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2219365A (en) * 1988-06-02 1989-12-06 Honda Motor Co Ltd Friction pad for use with disc brake
JPH10274264A (ja) * 1997-03-31 1998-10-13 Toyota Motor Corp ハイブリッドブレーキライニング
JP2015165162A (ja) * 2015-03-20 2015-09-17 北海道旅客鉄道株式会社 車両用制輪子及び摩擦材料
US20160047016A1 (en) * 2013-03-25 2016-02-18 Nippon Steel & Sumitomo Metal Corporation Copper alloy powder, sintered copper alloy body, and brake lining for use in high-speed railways
CN107304281A (zh) * 2016-04-18 2017-10-31 青岛志卓通力新材料有限公司 一种地铁车辆用合成闸瓦及其制备方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2219365A (en) * 1988-06-02 1989-12-06 Honda Motor Co Ltd Friction pad for use with disc brake
JPH10274264A (ja) * 1997-03-31 1998-10-13 Toyota Motor Corp ハイブリッドブレーキライニング
US20160047016A1 (en) * 2013-03-25 2016-02-18 Nippon Steel & Sumitomo Metal Corporation Copper alloy powder, sintered copper alloy body, and brake lining for use in high-speed railways
JP2015165162A (ja) * 2015-03-20 2015-09-17 北海道旅客鉄道株式会社 車両用制輪子及び摩擦材料
CN107304281A (zh) * 2016-04-18 2017-10-31 青岛志卓通力新材料有限公司 一种地铁车辆用合成闸瓦及其制备方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 201564, Derwent World Patents Index; AN 2015-548840, XP002799775 *
MUKESH KUMAR ET AL: "Influence of various metallic fillers in friction materials on hot-spot appearance during stop braking", WEAR, ELSEVIER SEQUOIA, LAUSANNE, CH, vol. 270, no. 5, 29 November 2010 (2010-11-29), pages 371 - 381, XP028136190, ISSN: 0043-1648, [retrieved on 20101204], DOI: 10.1016/J.WEAR.2010.11.009 *

Also Published As

Publication number Publication date
IT201900021813A1 (it) 2021-05-21

Similar Documents

Publication Publication Date Title
CN1095741C (zh) 制造较软的产品的方法和该产品本身
KR20200011429A (ko) 한 겹의 탄력있는 티슈 제품
KR20200010281A (ko) 여러 겹의 탄력있는 티슈 제품
WO2006092270A1 (fr) Disque de frein notamment destine a un vehicule
CN101607411A (zh) 竹纤维增强复合材料及其制造方法
WO2021100009A1 (fr) Patins pour freins de roue
US7360325B2 (en) Multiply insole
CA2865384A1 (fr) Plaque de segment de frein a disque composite
US4871394A (en) Sintered metal friction facing
CN112218983B (zh) 包括一层或多层金属层的磨损复合材料
US8192585B2 (en) Shoe press belt
US10750824B2 (en) Footbeds having varying compression characteristics
JP5797452B2 (ja) サイプブレード及びタイヤ製造方法
EP2006347B1 (fr) Matériaux d'accumulation de chaleur latente
WO2021100011A1 (fr) Blocs pour freins de roue
US2747701A (en) Brake lining with wire reinforcement
EP4006373B1 (fr) Frein à disque pour véhicule ferroviaire
US2303916A (en) Process for producing compressed laminated wood
US2186679A (en) Calender roll
EP1941095A2 (fr) Bande de transfert
CN209473712U (zh) 一种鞋底片材
JPWO2017204360A1 (ja) 竹繊維の圧縮硬化体の製造方法及びその製造方法により製造した竹繊維の圧縮硬化体
RU2799951C1 (ru) Фрикционный элемент тормозной колодки для железнодорожного транспортного средства и тормозная колодка
US1738291A (en) Friction lining and method of forming same
RU216929U1 (ru) Тормозная накладка для дискового тормоза железнодорожного транспортного средства

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20828110

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20828110

Country of ref document: EP

Kind code of ref document: A1