E D F A B H J K G Straight Bore M A B J G K D E Tapered Bore Rubber block drives for internal combustion engine power transmission applications that do not require a disconnect clutch. The design is similar to a gear tooth drive except that the gear teeth are moulded blocks. Two types of blocks are currently available. The mating driving ring is precision shaped for the blocks and is bolted directly to the engine flywheel. The rubber block drive can absorb a reasonable amount of angular and parallel misalignment and is installed without the usual pilot bearing in the engine flywheel cavity. These type of drives are perfectly suited to installations such as pumps, compressors and single and double bearing generator drives. Standard sizes available include 11, 14, 18 and 21 inch units. Other sizes are available in production quantities only. These drives consist of a drive spider, a driving ring and rubber blocks. The drive can also be supplied with a shaft, bearings and a bellhousing in certain sizes. These units are designed for industrial engines having SAE flywheel housings. The single row, 11 inch version can be installed on engines with an SAE No.2 housing. The single and double row 14 inch rubber block drive PTO units can be installed on engines with SAE No.1 or No.0 housings. For further information contact jbj Techniques technical office; telephone: +44 (0)1737 767493 or email: info@jbj.co.uk Rubber Block Direct Drive PTO RB Series Dimensional Data in Millimetres (inches) 11" 14" *14" 18" 21" **21" XB-5105 XB-6626 XB-4551 XB-6627 XB-6628 XB-6949 8 8 8 6 12 12 13/32 20 A-6816 A-6130 A-6802 A-6135 A-6137 A-6138 17/32 17/32 28 52 21/32 21/32 21/32 36 42 84 - 22.4 (0.88) - - - - 352.3 352.4 (13.871) (13.875) A B D E F Max. Keyway G 333.2 333.5 (13.120) (13.130) 41.1 (1.62) 20.6 (0.81) 3.8 (0.15) ⁵⁄ x ⁵⁄ 9.4 (0.37) 75.9 76.5 (2.990) (3.010) 63.4 63.5 (2.499) (2.500) 466.6 466.7 (18.370) (18.375) 438.0 438.3 (17.245) (17.255) 41.1 (1.62) 20.6 (0.81) 3.8 (0.15) ⁷⁄ x ⁷⁄ 9.4 (0.37) 88.9 (3.50) 88.8** 88.9 (3.499)** (3.500) 466.6 466.7 (18.371) (18.375) 438.0 438.3 (17.245) (17.255) 65.0 (2.56) 20.6 (0.81) 3.8 (0.15) ⁷⁄ x ⁵⁄ - 91.4 (3.60) 88.8 88.9 (3.499) (3.500) H J Max. Bore K M Size Drwg.No. Drive Spider Assembly Size No. Driving Ring Drwg.No. Holes Block Qty. 571.4 571.5 (22.495) (22.500) 542.8 543.1 (21.370) (21.380) 41.1 (1.62) 20.6 (0.81) 3.8 (0.15) 1 x ¹⁄ 101.6 (4.00) 99.9 100.0 (3.937) (3.938) 9.4 (0.37) 672.9 673.1 (26.495) (26.500) 641.4 641.5 (25.245) (25.255) 41.1 (1.62) 20.6 (0.81) 3.8 (0.15) 1 x ¹⁄ 114.3 (4.50) 9.4 (0.37) 114.1 114.3 (4.499) (4.500) 672.9 673.1 (26.495) (26.500) 641.4 641.5 (25.245) (25.255) 82.6 (3.25) 41.1 (1.62) 7.1 (0.28) 1 x ¹⁄ 114.3 (4.50) 12.7 (0.50) 133.3 133.4 (5.248) (5.250) ** Double row of blocks. * Tapered bore (1¹⁄ taper per foot). Continuous Rating Intermittent Rating Maximum Input Torque Nm (Lbs.Ft.) Size Drawing Number Maximum Safe RPM Capacity Data 11" XB-5105 4190 1620.202 (355) 2074.401 (455) 3735.278 (815) 7260.405 (1585) 2915.009 (635) Max. Peak Compressor Torque NM (Lbs.Ft.) A-3905-B Blocks A-3905-E Blocks A-3905-B Blocks A-3905-E Blocks A-3905-B Blocks A-3905-E Blocks A-3905-B Blocks A-3905-E Blocks 5809.680 (1270) Max. 82°C Min. - 40°F Max. 180°F Min. - 40°F Max. 121°F Min. - 40°F Max. 250°F Min. - 40°F Continuous Ambient Temperature Range Drive Spider Assembly 14" XA-6626 2990 942.294 (695) 1206.678 (890) 2169.309 (1600) 4209.815 (3105) 1687.993 (1245) 3369.208 (2485) 14" XA-4551 3670 1620.202 (1195) 2074.401 (1530) 3735.278 (2755) 7260.405 (5355) 2915.009 (2150) 5809.680 (4285) 18" XA-6627 2320 1552.412 (1145) 1993.052 (1470) 3579.359 (2640) 6962.125 (5135) 2792.985 (2060) 5572.412 (4110) 21" XA-6628 2030 2115.076 (1560) 2704.857 (1995) 4874.166 (3595) 9477.167 (6990) 3803.069 (2805) 7579.022 (5590) 21" XA-6949 2030 4223.373 (3115) 5416.493 (3995) 9748.331 (7190) 18954.330 (13,980) 7606.139 (5610) 15164.820 (11,185) www.jbj.co.uk/mechanical-power-conversion.html #DriveLineHarmony 57 The above torque values apply only to internal combustion engine drives. Multiply above ratings by 1.28 for electric motor drives.
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