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Summary of Contents for Danfoss Airflex DBBS
- Page 1 Airflex DBBS Brake Assemblies ® Installation, Operation and Maintenance Manual DBB 8110 BC435263268970en-000101...
- Page 2 ® Operation and Maintenance of the product described herein. The Airflex Division of Danfoss Power Solutions recommends the use of genuine Without access to this information, faulty Installation, Air ex replacement parts. The use of non-genuine Airflex replacement parts could Operation or Maintenance may result in personal injury or result in substandard product performance, and may void your Danfoss warranty.
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Page 3: Table Of Contents
DBBS Brakes Table of Contents INTRODUCTION ................................Description ................................ How It Works ..............................INSTALLATION ................................Alignment ................................Mounting ................................Air Supply System ............................. OPERATION ................................... Pressure and Speed Limits ..........................Initial Operation .............................. - Page 4 DBBS Brakes Index of Tables Table No. Table Title Page No. Item Descriptions Alignment Requirements Brake Sizes Requiring Rigid Support Fastener Description and Assembly Torque Maximum Disc Speeds Wear-in Parameters Wear Limits for DBBS Components Wear Gap Values Power Head Weights Index of Figures Figure No.
- Page 5 DBBS Brakes Figure 1 (2 Disc DBBS) Table 1 Item Description Item Description ITEM DESCRIPTION ITEM DESCRIPTION Mounting Flange Outer Lip Seal Stud Spacer Tube Friction Disc Gear Clamp Tube Wear Spacer Pressure Plate Reaction Plate Spring Housing Release Spring Flat Washer Inner Spring Locknut...
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Page 6: Introduction
DBBS Brakes Introduction Throughout this manual there are a number of 1.1.4 This manual includes metric equivalents usually HAZARD WARNINGS that must be read and adhered shown in parentheses ( ) following the U.S. to in order to prevent possible personal injury and/ measurement system value. -
Page 7: Mounting
Do not allow the gear temperature to exceed 350°F (176°C). Overheating the gear will adversely a ect the hardness and wear life. * Customer must provide a RIGID support on the cylinder end of the brake. Consult Danfoss Airflex Engineering for design parameters. 2.2.5... -
Page 8: Air Supply System
DBBS Brakes TABLE 4 Fastener Description and Assembly Torque, lubed, ft.-lb. (Nm) Item No. & Description Specification 20DBBS 25DBBS* 38DBBS 50DBBS Size 3/4-10NC-3 1-1/8 7NC-3 1-3/8 - 6NC3 1-3/8 - 6NC3 Self Locking Nut Torque 150 (203) 500 (6 77) 750 (1015) 750 (1015) Size... -
Page 9: Operation
DBBS Brakes Operation TABLE 5 Maximum Disc Speeds Pressure and Speed Limits Size Max. Free Wheeling Speed RPM 3.1.1 Maximum allowable pressure is 120 psig (8.2 bar) 20DBBS 2200 for sizes 20DBBS, 25DBBS and 38DBBS. Maximum 25DBBS 1700 allowable air pressure is 150 psig (10.3 bar) for the 38DBBS 50DBBS. - Page 10 The standard quantity is listed in Table 6. If a brake contains less than the standard compliment of Caution springs, consult Danfoss/Airflex engineering for proper brake pressure to wear-in the brake and spring Excessive restriction of the brake exhaust air will quantity if unknown for the specific brake.
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Page 11: Periodic Inspection
DBBS Brakes released. Causes of dragging discs may include wear or contamination of the gear or disc splines, disc imbalance, warped discs, or excessive shaft float. 3.3.5 Pneumatic and electrical control interlocks should be periodically checked for correct settings and operation. - Page 12 DBBS Brakes FRICTION BLOCK WEAR GROOVE WEAR GROOVES Figure 4 4.2.1 To determine when adjustment is required, make 4.2.2 Wear Adjustment with Solid Wear Spacers sure the brake is engaged then measure the gap between the spring housing (16) and the pressure Note plate (14) as shown in Figure 5.
- Page 13 DBBS Brakes TABLE 7 Wear Limits for DBBS Components (Ref. Figs. 1 & 2 and Section 4.2) Item Description Wear Limit Remarks Fully Worn at Bottom of dust groove. See Figure #4. Friction Material must also be replaced if contaminated Brake has adjustment provision #8 Friction Disc Friction Material...
- Page 14 DBBS Brakes TABLE 8 Wear Gap Values, - Inches (mm) (X-Gap) Gap (Y -Gap) *X-Gap Required for Y -Gap gap required for Disc Size Qty. of New Gap Adjustment New Gap Adjustment Inches Discs inch (mm) inch (mm) inch (mm) inch (mm) 0.14 (3,6) 0.64 (16,3)
- Page 15 DBBS Brakes Figure 6 Figure 7 Figure 8 Figure 9 Airflex DBB 8110 Brake Assembly E-CLCL-TT001-E December 2012 ®...
- Page 16 DBBS Brakes Caution Loctite#262 must be shaken prior to application. Caution Loctite #262 may irritate sensitive skin. Refer to the product label for safety precautions. 4.2.2.4 Remove the outboard disc (58), the reaction plate (31) and the release springs (34) and set aside. Note For 3 disc brakes remove one additional disc, reaction plate and set of springs during disassembly.
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Page 17: Friction Disc Replacement
DBBS Brakes not have the slot then they are solid wear spacers 4.2.3.5 Using a narrow chisel wedged into the slot in the and the DBBS must be disassembled per 4.2.2 in wear spacer, pry the wear spacer until it fractures order to make adjustments. - Page 18 DBBS Brakes Friction disc replacement is required when the have dried, assemble to the mounting flange using friction material is worn to the bottom of the wear Loctite #262. The end of the stud must not extend groove or step for size 50 brake, as indicated in past the mounting surface on the mounting flange.
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Page 19: Cylinder Seal Replacement
If unsure of assembly position, 4.4.5 Insert new seals (21) (23) into the grooves, noting the consult Danfoss Airflex Engineering. The springs on orientation of the seals per Figure 12. either side of the reaction plate must be assembled on the same stud, over the clamp tubes. -
Page 20: Spring Replacement
DBBS Brakes 4.4.6 Carefully examine the seal surfaces in the cylinder 4.5.1.4 Loosen the screws (20) gradually ONE TURN AT (19). If the surfaces have worn to the point as A TIME, following a crosswise pattern until the indicated on Table 7, the cylinder must be replaced. remaining spring force is relieved. - Page 21 DBBS Brakes Apply Loctite #262 to the screw threads and reinstall 4.5.2.1 Disconnect the air supply lines from the brake. the hex head screw. Immediately torque the hex head screw to the value shown on Table 4. 4.5.2.2 Remove the fasteners that secure the brake and support brackets (if applicable) to the mounting structure Note...
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Page 22: Ordering Information/Technical Assistance
5.1.1 In any correspondence regarding Danfoss Airflex Equipment, refer to the information on the product nameplate and call or write: 4.5.2.13 Lubricate the ends of the studs (6) with a 30 weight... -
Page 23: Parts Lists
DBBS Brakes PARTS LISTS Basic Assemblies 120DBBS 220DBBS 320DBBS 420DBBS Item Description 146323A 146322A 146373A 146374A Part Number Part Number Part Number Part Number Mounting Flange 513331 513331 513331 513331 Stud 000245 x 0066 000245 x 0063 000245 x 0083 000245 x 0098 Friction Disc 513326... - Page 24 DBBS Brakes 138DBBS 238DBBS 338DBBS 438DBBS Item Description 146328A 146329A 146384A 146385A Part Number Part Number Part Number Part Number Mounting Flange 513391 513391 513391 513391 Stud 000245 x 00 73 000245 x 00 75 000245 x 0106 000245 x 0105 Friction Disc 513396 513396...
- Page 25 DBBS Brakes DBBS Cylinder Seal Kits Parts included in Kit Seal Lubricant Inner Lip Seal (21) Outer Lip Seal (23) Instruction Sheet Model Kit P/N Part No. (qty) Part No. (qty) Part No. (qty) Part No. (qty) 20DBBS 107726C 000153 x 1239 (1) 000402x0021 (2) 000402x0022 (2) 20406 7 (1)
- Page 27 Phone: +45 7488 2222 Phone: +86 21 2080 6201 Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products agreed.
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