• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A disc brake shoe (1) for railway vehicles comprising a support plate (2) and a plurality of friction elements (4) fixed to the support plate (2). The friction elements (4) comprise friction elements made of sintered material (4b) and friction elements made of organic material (4a). The friction elements made of sintered material (4b) are more than the friction elements made of organic material (4a). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2774623A1
    申请号:ES201930937
    申请日:2019-10-24
    公开日:2020-07-21
    发明作者:Soccio Vittorio De
    申请人:Cofren SRL；
    IPC主号:
    专利说明:

    [0003] CROSS REFERENCE TO ASSOCIATED PATENT APPLICATIONS
    [0004] The present application claims the priority of the Italian Patent Application No. 102019000015309 filed on August 30, 2019, the content of which is incorporated herein by reference.
    [0006] TECHNICAL FIELD
    [0007] The present invention relates to a disc brake shoe for medium / low speed rail vehicles.
    [0009] STATE OF THE PRIOR ART
    [0010] As is known, disc brakes are subject to high stresses and to obtain an optimal braking action it is necessary to have a good transmission of the brake force from the shoe to the disc.
    [0012] It has long been a trend to use shoes that comprise a plurality of reduced-size friction elements, rather than a single, larger friction element. One of the solutions adopted in this regard provides that each shoe is substantially constituted by a main support plate and by a plurality of friction elements fixed to the support plate. Generally, each one of the friction elements is formed by a plate and a friction block fixed integrally to the plate.
    [0014] The solution relating to the use of a plurality of friction elements of reduced dimensions is advantageous both in terms of efficiency of the pressure on the disc, and therefore braking, and in terms of low noise level. In this regard, it should be noted that the low noise level has increasingly become a determining factor in the choice of disc brakes to use.
    [0015] As can easily be assumed, the need to reduce the noise level in the braking phase is greater in trains designed to make a high number of stops, such as metropolitan railways, regional or intercity trains.
    [0017] Many of the solutions that lead to a reduction in the noise level of the brakes suffer the disadvantage of leading to a decrease in the transmission of the braking force from the brake pad to the disc and, therefore, a decrease in the effectiveness of the brake itself. braking. In fact, as is obvious, trains designed to make many stops (low / medium speed trains), even if they do not reach very high speeds, have to be able to have a high efficiency of the braking action.
    [0019] Here and in the following, medium / low speed trains are understood to be trains with a maximum speed of 220 km / h.
    [0021] Another especially important need in the brakes of trains designed to make many stops, refers to a reduction of polluting emissions in terms of fine dust produced in the braking phase. In fact, the aforementioned trains circulate and stop repeatedly in areas with high population density, such as inhabited centers and stations. Generally, solutions that lead to a reduction in the braking noise level have the disadvantage of having a high emission of fine dust.
    [0023] It was therefore necessary to have a type of disc brakes for low / medium speed trains, whose technical characteristics are of such a nature that they guarantee a low level of noise in the braking phase, without thereby entailing disadvantages both in terms of efficiency. of braking as in terms of fine dust produced.
    [0025] The inventor of the present invention has obtained a solution relating to a disc brake shoe for medium / low speed trains, in which the arrangement and characteristics of the friction elements guarantee the satisfaction of the need indicated above.
    [0027] OBJECT OF THE INVENTION
    [0028] The object of the present invention is a shoe for disc brakes for railway vehicles that comprises a support plate and a plurality of friction elements fixed to the support plate; said shoe being characterized by the fact that said friction elements comprise friction elements made of sintered material and friction elements made of organic material; said friction elements being made of sintered material with a higher number than said friction elements made of organic material.
    [0030] Preferably, the friction elements are arranged in arcuately shaped rows and, in use, substantially superimposed on respective concentric lines of a disc on which the shoe acts.
    [0032] Preferably, each row with an arcuate shape comprises at least one friction element made of organic material and, to a greater number, friction elements made of sintered material.
    [0034] Preferably, the composition of the sintered material is as follows: 10 to 70% by weight of copper, 5 to 40% by weight of iron, 5 to 20% by weight of graphite, 1 to 10% by weight of modifiers friction.
    [0036] Preferably, the composition of the organic material is as follows: 5 to 30% by weight of rubber and resin, 10 to 50% by weight of filler, 5 to 20% by weight of graphite, 5 to 20% by weight of friction modifiers.
    [0038] BRIEF DESCRIPTION OF THE DRAWINGS
    [0039] For a better understanding of the invention, a merely illustrative and non-limiting embodiment is shown below with the help of the figures in the attached drawing, where:
    [0041] Figure 1 is a plan view, with parts in transparency for clarity reasons, of a shoe object of the present invention;
    [0043] Figure 2 is a plan view, with parts in transparency for clarity, of a comparison shoe;
    [0044] Figure 3 is a graph in which the results of noise level as a function of speed have been recorded with respect to the shoe of Figure 1;
    [0046] Figure 4 is a graph in which the results of noise level as a function of speed have been recorded with respect to the shoe of Figure 2;
    [0048] Figure 5 is a graph in which the results in terms of friction of the shoes of Figure 1 and Figure 2 have been recorded respectively.
    [0050] PREFERRED EMBODIMENT OF THE INVENTION
    [0051] In FIG. 1 a disc brake shoe according to the present invention is indicated as a whole with 1.
    [0053] The shoe 1 comprises a support plate 2, a "dovetail" fixing element 3 fixed to a rear surface of the support plate 2 and whose function is to fix the shoe 1 itself to a structure of the disc brake and a plurality of friction elements 4 fixed to the support plate 2 and arranged to exert pressure on the brake disc to perform the braking action.
    [0055] For the purposes of the present invention it is irrelevant whether the friction elements 4 can be fixed to the plate 2 reversibly or irreversibly.
    [0057] The friction elements 4 are arranged along the arcuately shaped rows illustrated with a broken line and indicated with 5, which in use substantially overlap concentric lines of a disk D on which the shoe 1 acts. For simplicity, disk D is illustrated with a broken line and only partially.
    [0059] The friction elements 4 are divided into: three friction elements made of organic material 4a and four friction elements made of sintered material 4b. For clarity, the friction elements made of organic material 4a are represented by a surface marked with a broken line.
    [0060] The organic material of the friction elements 4a has a composition that meets the following conditions: 5 to 30% by weight of rubber and resin, 10 to 50% by weight of filler, 5 to 20% by weight of graphite, 5 to 20% by weight of friction modifiers. The sintered material of the friction elements 4b has a composition that meets the following conditions: 10 to 70% by weight of copper, 5 to 40% by weight of iron, 5 to 20% by weight of graphite, 1 10% by weight of friction modifiers.
    [0062] In FIG. 2, a disc brake shoe is indicated as a whole by 11 according to a comparison example.
    [0064] The parts of the shoe 11 equal to those of the shoe 1 will be indicated with the same numbering and will not be described again.
    [0066] The shoe 11 differs from the shoe 1 in that all the friction elements 4 are friction elements made of sintered material.
    [0068] Shoe 1 and shoe 11 have been subjected to noise level measurements during braking carried out according to the procedure indicated in standard UIC 541-3 ed. 7 prog 5B and friction tests according to the procedure indicated in the UIC 541-3 ed. 7 program 5B. Figures 3 and 4 represent the graphs corresponding respectively to the noise level tests carried out on the shoe 1 and on the shoe 11.
    [0070] Each of the graphs shows different curves made with different operating conditions relative to the application forces (pressure) of the shoe on the disc. Obviously, in the graphs of Figures 3 and 4 the curves represented in the same way have been made with the same conditions of application force.
    [0072] In each of the graphs a tolerance line is shown, which indicates how up to a speed of 80 km / h a braking noise of up to 100 decibels is allowed, while under 60 km / h (presumably the train is inside the station) a braking noise level of up to 90 decibels is allowed.
    [0074] From Figures 3 and 4 it is evident how the shoe object of the present invention (graph of Figure 3) produces a noise constantly below the tolerance line. For him On the contrary, the comparison shoe (graph in figure 4), in most operating conditions, produces a noise higher than that indicated by the tolerance line for speeds below 60 km / h.
    [0076] The graph of figure 5 reflects the friction values registered in the shoe of the invention (INV.) Of figure 1 and in the comparison shoe (CONF.) Of figure 2 under different operating conditions (application force of the shoe on the disc and speed). From the graph of figure 5 it can be clearly seen how the shoe of the invention and the comparison shoe, despite having a different type of friction elements together, present the same performance in terms of friction.
    [0078] Furthermore, the majority presence of friction elements made with sintered material compared to friction elements made with organic material guarantees a contained production of fine dust caused by the friction exerted during the braking action.
    [0080] Summarizing, the present invention refers to a shoe for disc brakes, the technical characteristics of which make it possible to reduce the noise level caused in the braking phase (comparison between Figures 3 and 4), without incurring the drawbacks related to a low braking efficiency (figure 5) and with a high production of fine dust.
    权利要求:
    Claims (5)
    [1]
    1. Shoe (1) for disc brakes for railway vehicles comprising a support plate (2) and a plurality of friction elements (4) fixed to the support plate (2); said shoe being characterized in that said friction elements (4) comprise friction elements made of sintered material (4b) and friction elements made of organic material (4a); said friction elements being made of sintered material (4b) more, in number, than said friction elements made of organic material (4a).
    [2]
    Shoe according to claim 1, characterized in that the friction elements (4) are arranged in rows (5) with arcuate shape and in use substantially superimposed on respective concentric lines of a disc (D) on which the shoe acts. (one).
    [3]
    Shoe according to claim 2, characterized in that each row (5) with an arcuate shape comprises at least one friction element made of organic material (4a) and, to a greater number, friction elements made of sintered material (4b).
    [4]
    Shoe according to one of the preceding claims, characterized in that the composition of the sintered material is as follows: 10 to 70% by weight of copper, 5 to 40% by weight of iron, 5 to 20% by weight of graphite, 1 to 10% by weight of friction modifiers.
    [5]
    Shoe according to one of the preceding claims, characterized in that the composition of the organic material is as follows: from 5 to 30% by weight of rubber and resin, from 10 to 50% by weight of filler, from 5 to 20% by weight of graphite weight, 5 to 20% by weight of friction modifiers.
    类似技术:
    公开号 | 公开日 | 专利标题
    KR101754299B1|2017-07-06|Railroad and industrial vehicle disk brake pad
    ES2774623B2|2021-07-07|DISC BRAKE SHOE FOR MEDIUM / LOW SPEED RAILWAY VEHICLES
    TWI624391B|2018-05-21|Railway vehicle disk brake pad
    JP6644869B2|2020-02-12|Brake lining for railway vehicle and disc brake for railway vehicle using the same
    ES2444694T3|2014-02-26|Brake lining, in particular a friction brake pad
    ES48311A1|1910-08-16|Improvements in automatic brakes for railroad cars.
    CH77865A|1918-06-01|Automatic and moderate brake, compressed air, for tram and railway vehicles
    ES33787A1|1904-06-01|Improvements in automatic vacuum brakes for railway cars and other analogues.
    KR20210035054A|2021-03-31|Disc/brake friction torque for railway vehicles
    US1914628A|1933-06-20|Friction shock absorbing mechanism
    ES35491A1|1905-03-16|Improvements in automatic vacuum brakes for railways and other vehicles.
    ES45237A1|1909-05-16|Improvements in wheel sets for railway cars, trams and other vehicles.
    FR457137A|1913-09-12|Friction brake for tramway cars, railways and others
    ES48761A1|1910-10-16|Improvements in trucks for railroad cars.
    CH64621A|1914-04-16|Brake drive, in particular for railway vehicles
    FR525122A|1921-09-15|Automatic compressed air brake for trams and secondary railways
    FR406170A|1910-01-24|Automatic brake for railway wagons
    CH53508A|1912-03-01|Westinghouse type railway brake
    DK8470C|1906-05-14|Suspension device for brake pads on railway wagons.
    ES45140A1|1909-05-16|Improvements made to pneumatic brakes for railway trains.
    CH69874A|1915-11-01|Brake signal device for railroad cars equipped with hand brakes
    ES44846A1|1909-03-16|Wheel for cars and other vehicles with pneumatic hub.
    ES58298A1|1914-07-01|An improved pneumatic wheel for cars and other vehicles.
    FR436068A|1912-03-16|Railroad car brake
    FR423073A|1911-04-06|Automatic air brake for freight trains
    同族专利:
    公开号 | 公开日
    FR3100210A1|2021-03-05|
    FR3100210B1|2022-01-14|
    IT201900015309A1|2021-03-02|
    ES2774623B2|2021-07-07|
    DE102019007421A1|2021-03-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4202432A|1977-12-12|1980-05-13|Komori Seisakusho Co., Ltd.|Clutch disk for use in automobile|
    DE19727705C1|1997-06-30|1999-02-11|Bba Friction Becorit Gmbh|Brake lining for part-lined disc brake, particularly for rail vehicle|
    EP2119934A1|2008-05-16|2009-11-18|NCFA S.r.l.|Sintered material friction shoes for disc brakes of railway wheeled vehicles|
    CN102146966A|2011-04-25|2011-08-10|盐城工学院|Clutch facing prepared by winding polyacrylonitrile fiber|
    EP2568002A1|2011-09-06|2013-03-13|Sumitomo Bakelite Co., Ltd.|Phenolic resin molding compound|
    CN107460362A|2017-08-11|2017-12-12|哈尔滨市哈东机车车辆配件厂|A kind of High Speed Railway Trains brake pad material and preparation method thereof|
    CN108458016A|2018-03-19|2018-08-28|湖南博云汽车制动材料有限公司|A kind of friction material and the preparation method and application thereof of automobile parking braking hoof|
    DE1575939B1|1967-01-21|1973-01-25|Jurid Werke Gmbh|FRICTION LINING ARRANGEMENT|
    DE102012012876A1|2012-06-06|2013-12-12|Becorit Gmbh|Modular brake pad system and brake pad|
    CN107989931A|2016-10-27|2018-05-04|克诺尔轨道车辆系统有限公司|Brake pad and rail vehicle|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    IT102019000015309A|IT201900015309A1|2019-08-30|2019-08-30|PAD FOR DISC BRAKES FOR MEDIUM / LOW SPEED RAILWAY VEHICLES|
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