358 TECHNICAL INFORMATION 2 Features of GT Belts t The tooth engagements occur based on involute motion that closely assimilates the profiles of both teeth, thus minimizing backlash and making the scheme suitable for high accuracy positioning applications. * Backlash means the clearances between the belt tooth surface and the pulley tooth surface when engaged. 2 Keyway Dimensions MXL (10 Toothed, Ø6.47mm) Static Backlash between the MXL Type Belt and the Pulley (Number of Pulley Teeth: 20) Static Backlash between the 2GT Type Belt and the Pulley (Number of Pulley Teeth: 20) 2GT (10 Toothed, Ø6.37mm) N: New JIS (B1301) Keyway Dimensions X100 Belt Tooth Profile 0.065mm Pulley Tooth Profile X100 0.013mm Belt Tooth Profile Pulley Tooth Profile Nominal dH7 bJS9 t Tolerance N 8 8 + 0.015 0 3 ±0.0125 1.4 + 0.1 0 N10 10 NK10 10 4 ±0.0150 1.8 N11 11 + 0.018 0 N12 12 N13 13 5 2.3 N14 14 N15 15 N16 16 N17 17 N18 18 6 2.8 N19 19 + 0.021 0 N20 20 N21 21 N22 22 N23 23 8 ±0.0180 3.3 + 0.2 0 N24 24 N25 25 N26 26 N27 27 N28 28 N29 29 N30 30 N31 31 + 0.025 0 10 N32 32 N33 33 N34 34 N35 35 N36 36 N37 37 N38 38 bJS9 dH7 t 6.3 6.3 6.3 6.3 2–R0.2 or less 2 Performance Comparison between MXL and 2GT Belts Reference : Durability <Performance Conditions> Number of belt teeth: 126 Belt Width: 9.5mm Number of Pulley Teeth: 12 (2GT) : 14 (MXL) Speed: 7,900rpm Load Torque: 24.3Nm Reference : Jumping Torque Capability <Performance Conditions> Number of belt teeth: 126 Belt Width: 4.8mm Number of Pulley Teeth: 20 (2GT) : 20 (MXL) Speed: 1,130rpm Tooth Height MXL: 0.51mm 2GT: 0.75mm Jumping Torque (N · cm) *Jumping Torque represents the max. torque when a jumping occurs. 0 9.8 19.6 28.8 Initial Tension (N) 20 40 60 80 100 MXL 2GT 120 140 Life Hours (h) 0 50 100 150 200 250 MXL 2GT 300 350 Belt Type 2 Features of Non-backlash Pulleys (S8M) t Non-backlash pulley has reduced backlash compared to conventional type to work with high accuracy positioning mechanism. t Backlash is significantly smaller than standard S8M pulleys. (The amount reduced depends on applications.) t Use regular S8M timing belt. 2 Cautions t %P OPU CFOE CFMUT UPP IBSE t 8IFO DPSF XJSF JT TUFFM DPSE BWPJE HJWJOH UFOTJPO GSPN UIF CBDLTJEF t "WPJE VTJOH BOE TUPSJOH UIF QSPEVDUT JO BO FOWJSPONFOU PG FYUSFNFMZ IJHI or low temperature (beyond the operating temperature) and high humidity. t "WPJE EJSFDU DPOUBDU XJUI XBUFS TPMWFOU PJM BDJE BMLBMJ VMUSB WJPMFU MJHIU ozone, etc. If the belt swells due to contact with oil, its service life will be considerably shortened. t .BLF TVSF UP TIVU EPXO UIF NBDIJOF BOE DPOGSN UIF DPNQMFUF TUPQ PG JUT behavior before starting installation or maintenance check. t 5JNJOH 1VMMFZT BOE #FMUT .9- 9- - ) GPS HFOFSBM VTF BSF DPNQMJBOU XJUI JIS and ISO Standards. Timing Pulleys: JIS B 1856( ISO5294) Timing Belts: JIS K6372 (ISO5296-1), JIS K6373 (ISO5296-2) t S Type (S M) timing pulleys and belts are compatible with S M type from Mitsuboshi Belting Ltd. as well as Bando Chemical Industries Ltd. t .54 5ZQF .54 . UJNJOH CFMUT BSF DPNQBUJCMF XJUI .54 . GSPN .JUTVCPTIJ Belting Ltd. t 1 5ZQF 1 M) timing pulleys and belts are compatible with P M Type from Tsubakimoto Chain Co. t 61 5ZQF 61 M) timing belts are compatible with UP M-HC Type from Tsubakimoto Chain Co. t ." 5ZQF UJNJOH QVMMFZT BOE CFMUT BSF DPNQBUJCMF XJUI ." Type from NOK Corporation. t (5 5ZQF GT) and EV Type (EV5GT, EV8YU) timing pulleys and belts are compatible with GT, EV5GT, EV8YU Types from Gates Unitta Asia Company. Reference: Comparison of Deviation Angles between Non-Backlash Pulleys and Standard Pulleys 0 0.2 0.4 0.6 0.8 1.0 1.2 9.8 4.9 T: Load Torque N·m Deviation Angle Index Non-Backlash Pulley Standard Pulley Deflection Deviation Angle T: Load Torque Ti: Tension Fixed Belt Type :S8M Belt Width :25mm Pulley Size : 30 Toothed (P.D.76.39mm) Tension Ti :382N <Test Conditions> C: Old JIS Keyway Dimensions Nominal dH7 bJS9 t Tolerance N39 39 + 0.025 0 12 ±0.0215 3.3 + 0.2 0 N40 40 N41 41 N42 42 N43 43 N44 44 N45 45 14 3.8 N46 46 N47 47 N48 48 N49 49 N50 50 N55 55 + 0.030 0 16 4.3 N60 60 18 4.4 N61 61 N62 62 N63 63 N64 64 N65 65 N66 66 20 ±0.0260 4.9 N67 67 N68 68 N69 69 N70 70 DH7 Shaft Bore Dia. and Code bF7 t Tolerance C10 4 +0.022 +0.010 1.5 + 0.1 0 C12 C15 5 2 C16 C18 C19 C20 C30 7 +0.028 +0.013 3 C33 10 3.5 C34 C35 C36 C37 C38 C39 C40 C41 12 +0.034 +0.016 C42 C43 C44 C45 C50 C55 15 5 C60 C61 18 6 C62 C63 C64 C65 C66 C67 C68 C69 C70 Timing Pulleys and Belts Overview
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