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' dddesecose.wpg " y#2p}wCF#UNITED NATIONS #ps7#yA+pddUN-LOGO3.WPGjy  r5Q  uu % % }}%+#d6X@`7 @#--17=55CDistr.  l  uu#ps7# Economic and Social#d6X@`7 @#7=55CRESTRICTED  lE  uu#ps7# Council}}%#d6X@`7 @#+--17=55CX` hp x (#%'0*,.8135@8: 18.1 cm2#2 R}}2 2 Ak = area of calliper piston(s)#2 R}}2 2 rw = effective radius of disc#2  +(( ^a ::  t @@@ ::// Hj@@@@@^           No of cycleNumber of brake applications XfInitial brake rotor temperature ($C)fMax. brake rotor temperature ($C)fForced cooling      1  26  7 6 %1 x 10 %5 x 10 %1 x 10 ( 60 100 100 open open (350) k]4Ѝ#d6X@DQ @# In the case of vehicles of category L, the temperature shall be limited to 350$C. If necessary, the number of applications per cycle must be reduced accordingly. However, in this case, the number of cycles shall be increased to keep the total number of applications constant.k openno no yes   f  r5 2.2.2.1.2.2 2 Shoe assemblies R}}2 2 The mean contact pressure at the brake lining working surface shall be constant at 22  6 N/cm2 calculated for a static brake without selfenergizing.#2 h ::// Hj@@@@@ :://D Hj@@@@@h       f  No of cycleBNumber of brake applications XInitial brake rotor temperature ($C)Max. brake rotor temperature ($C)Forced cooling     D  1  2  3  4%1 x 10 %1 x 10 %1 x 10 %1 x 10 60 100 100 100200 open 200 openyes no yes no    r5 2.2.2.2.2 2 Test schedule with constant torque R}}2 2 This method applies only for pad assemblies. The brake torque shall be constant within a tolerance of 5 per cent and adjusted to guarantee the maximum brake rotor temperatures given in the table below.#2 +(( h :://D Hj@@@@@ ::// HO h @@@@@h         No of cycleNumber of brake applications XInitial brake rotor temperature ($C)Max. brake rotor temperature ($C)Forced cooling      k   1  24  5  69  10 < 1113  14 &1 x 5 &3 x 5 %M1 x 10 &4 x 5 %M1 x 10 &3 x 5 &1 x 5  60 100 100 100 100 100  60 300350 (200250) wh4Ѝ#d6X@DQ @# Values in brackets for vehicles of category L.w 300350 (200250) 500600 (300350) 300350 (200250) 500600 (300350) 300350 (200250) 300350 (200250) no no no no no no no  k   r5$ 2.3.R}}2 2 Evaluation of test results#2 R}}2 2 Friction behaviour is determined from the brake torque noted at selected points in a test schedule. Where brake factor is constant, e.g. a disc brake, brake torque may be translated to coefficient of friction.#2  r5 2.3.1.2 2 Pad assemblies#2  r5, 2.3.1.1.2 2 The operational coefficient of friction (%op) is the mean of the values recorded during cycles two to seven (constant pressure method) or during cycles 24, 69 and 1113 (constant torque method); measurement being made one second after commencing the first brake application of each cycle.#2  r5 2.3.1.2.2 2 The maximum coefficient of friction (%max) is the highest value recorded during all cycles.#2  r54 2.3.1.3.2 2 The minimum coefficient of friction (%min) is the lowest value recorded during all cycles.#2  r5 2.3.2.2 2 Shoe assemblies#2  r5 2.3.2.1.2 2 The mean torque (Mmean) is the average of the maximum and minimum values of brake torque recorded during the fifth brake application of cycles one and three.#2  r5< 2.3.2.2.2 2 The hot torque (Mhot) is the minimum brake torque developed during cycles two and four. If the temperature exceeds 300$C during these cycles the value at 300$C is to be taken as Mhot.#2  r5\# 2.4.R}}2 2 Acceptance criteria#2  r5$ 2.4.1.2 2 With each application for approval of a brake lining assembly type there shall be submitted:#2 %7+((Ԍ r5 ԙ2.4.1.1.2 2 for pad assemblies, values for %op, %min, %max.  r5 2.4.1.2.2 2 for shoe assemblies, values for Mmean and Mhot.  r5  2.4.2.2 2 During production of an approved brake lining assembly type, test samples must demonstrate compliance with the values registered under paragraph 2.4.1. of this annex with the following tolerances:#2  r5 2.4.2.1.2 2 for disc brake pads: R}}2 2 %op  15 per cent of registered value#2 R}}2 2 %min  registered value#2 R}}2 2 %max  registered value#2  r5 2.4.2.2.2 2 for simplex drum brake linings: R}}2 2 Mmean  20 per cent of registered value#2 R}}2 2 Mhot  registered value."#2 Insert new paragraphs 3 to 3.4.2., to read:  r5 "3.R}}2 2 Brake lining assemblies and drum brake linings for vehicles of categories M3, N2, N3, O3, and O4#2  r5P 3.1.R}}2 2 Equipment#2  r5 3.1.1.2 2 The machine shall be equipped with a disc brake of the fixed calliper type with a cylinder diameter of 60 mm and a solid (not ventilated) disc having a diameter of 278  2 mm and a thickness of 12 mm  0.5 mm. A rectangular piece of the friction material with an area of 44 cm2  0.5 cm2 and a thickness of at least 6mm shall be attached to the backing plate.#2  r5X 3.1.2.2 2 The disc rotational speed shall be 660 10 1/min without load and shall not fall below 600 1/min on full load.#2  r5 3.1.3.2 2 The mean contact pressure at the brake lining working surface shall be constant at 75 N/cm2 10 N/cm2.#2  r5 3.1.4.2 2 The test cycles and brake applications during the cycles to be adjustable and automatic.#2  r5`" 3.1.5.2 2 Output torque and working surface temperature shall be recorded.#2  r5# 3.1.6.2 2 Provisions shall be made to direct cooling air across the brake at a rate of 600  60 m3/h.#2  r5H& 3.2.R}}2 2 Test procedure#2  r5' 3.2.1.2 2 Sample preparation#2 '+((ԌR}}2 2 The manufacturer's bedding procedure shall ensure a minimum of 80per cent surface contact area without exceeding a surface temperature of 200$C.#2  r5  3.2.2.2 2 Test schedule#2 R}}2 2 The test procedure comprises a number of consecutive braking cycles each containing a number of X braking intervals of five seconds brake applied.#2 c ::// HO h @@@@@ ::// : #@@@Bc         No of cycle Number of brake applications Xn Initial brake rotor temperature ($C)n Forced cooling        1  2  3  4  5  6  7  8  9  10  11 ,$5 ,$5 ,$5 ,$5 ,$5 ,$3 ,$3 ,$3 +10 ,$5 ,$5 100 increasing  200 200 increasing  300 300 250 200 150 100 increasing  300 300 yes no no no no yes yes yes yes no no  n    r5L 3.3.R}}2 2 Evaluation of test results#2 R}}2 2 Friction behaviour is determined from the brake torque noted in selected cycles of the test schedule. Brake torque shall be translated to coefficient of friction %.#2 R}}2 2 The %value of each brake application shall be determined as the mean value of the 5 seconds brake applied.#2  r5T 3.3.1.2 2 The operational coefficient of friction %op1 is the mean value of % recorded for the brake applications in cycles 1 and %op2 is the mean value of % recorded for the brake applications in cycle 9.#2  r5t 3.3.2.2 2 The maximum coefficient of friction %max is the highest value of % recorded in an application during cycles 1 to 11 inclusive.#2  r5! 3.3.3.2 2 The minimum coefficient of friction %min is the lowest value of % recorded in an application during cycles 1 to 11 inclusive.#2  r5$$ 3.4.R}}2 2 Acceptance criteria#2  r5% 3.4.1.2 2 With each application for approval of a replacement brake lining assembly type or a replacement drum brake lining type, there shall be submitted values for %op1, %op2, %min and %max.#2  (+((Ԍ r5 3.4.2.2 2 During production of an approved replacement brake lining assembly type or replacement drum brake lining type, test samples must demonstrate compliance with the values registered under paragraph3.4.1. of this annex within the following tolerances:#2  ? R}}2 2 %op1, %op2  15 per cent of the registered value#2  ? R}}2 2 %min  registered value#2  ? R}}2 2 %max  registered value."#2 n0___________