Function Description S-ABA

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1 Function Description S-ABA Leader s guide for OH-serie 8298

2 Exploded view 1. Housing 2. Bushing 3. Worm wheel. Worm shaft 5. O-Ring 10. Needle bearing 11. Front cover 12. Control unit assembly 17. Coil spring 18. Thrust washer 2. Torx Screw 27. Gasket 28. O-Ring 0. Rivet 6. Plastic insert 7. Compression spring 8. Spring support 9. Adjusting screw 50. Toothed plate 51. Companion flange 52. Gear wheel spring. Gear wheel 5. Regulator shaft 55. Control disc. Clutch wheel 7-5 = Regulator assembly 2

3 55 Of the total stroke, (= Brake chamber push rod stroke) fully applied brakes should be achieved within the full power band specified for actual brake chamber, here symbolised as 1/3 and 2/3 of the total stroke. The red band, 3/3 symbolises the section of the total stroke not recommended for use by the brake chamber manufacturer. (See force-chart for actual brake chamber.) Notice the set marks drawn on control disc (55) and gear wheel (), used for reference picture to picture only Rest Position The brake application cycle is divided into three sections: C, stroke related to designed clearance between brake lining and drum = free stroke. Ce, stroke related to excessive clearance. E, elasticity zone.

4 Brake Apply Passing the nominal clearance C The regulator gear wheel () rolls down the control disc (55) along the angular distance corresponding to the pre-determined clearance between the gear wheel () and the companion flange (51). During this sequence, the torque transmitted by the gear wheel spring (52) is decreased. The gear wheel spring (52) is retained between the gear wheel () and the companion flange (51) so that both provide a torque and a compression force to the ratchet one way clutch (50+51) between the companion flange (51) and the adjusting screw (9).

5 Brake Apply Passing the excessive clearance Ce During this stroke section the gear wheel () starts to drive the companion flange (51) and the toothed plate (50) axially apart. If Ce is large enough, a new tooth engagement will take place. New tooth engagement does not happen under normal operation, as lining wear is continuously compensated for.

6 Brake apply Disconnection of adjustment mechanism The brake linings are now in touch with the drum. Input torque transmitted from the S-cam, via the worm wheel (3), the worm shaft () to the thrust washer (18). The coil spring (17) is compressed as the worm shaft () moves axially until it reaches its bottom position towards the internal wall in the housing (1). The cone clutch between the worm shaft () and the clutch wheel () is now open. The axial opening between the companion flange (51) and the toothed plate (50) (corresponding to Ce) is now closed again by the gear wheel spring (52).

7 Brake Apply The braking takes place, elasticity zone E The regulator gear wheel () rolls further down the control disc (55). As the cone clutch is now open, the regulator assembly (7 5) can freely rotate the clutch wheel ().

8 Brake Release Beginning of brake release, elasticity zone E The regulator gear wheel () returns the corresponding distance to the previous position and, as the conus clutch is open, freely turns the clutch wheel (). Note! As the adjustment takes place on the last portion of the angular travel of the return stroke, C and Ce have now changed places. 8

9 Brake Release Connection of adjustment mechanism The input torque transmitted is now decreased and overcome by the force in the coil spring (17). The worm shaft () moves axially until it reaches the clutch wheel (). The cone clutch is re-engaged. 9

10 Brake Release Passing through nominal clearance C As the cone clutch now is closed, the rotation resistance for the clutch wheel () is increased and the wheel stops. During continued ABA return movement, the gear wheel () rolls further up the control disc (55), but the gear wheel spring (52) is not able to turn the companion flange (51) and the adjusting screw (9) because of the resistance in the clutch wheel (). During this phase the predetermined clearance between the gear wheel () and the companion flange (51) is travelled. This tensions the gear wheel spring (52) radially. 10

11 Funktionsbeschreibung S-ABA Funktionsbeschreibung S-ABA Overhead Folien bis Adjustment Passing Ce, lining wear is partly compensated for The gear wheel () rolls on the control disc (55) and drives through the regulator assembly(7-5), the clutch wheel (), the worm shaft (), and the worm wheel (3) which in turn rotates the S-cam. Note the set marks back in starting position. 11

12 Austria Haldex Wien Ges.m.b.H. Vienna Tel.: Fax: office@baeder-haldex.at Belgium Haldex N.V./S.A. Balegem (Ghent) Tel.: Fax: info.hbe@haldex.com Brazil Haldex do Brasil São Paulo Tel.: Fax: info@hbr.haldex.com China Haldex International Trading Co. Ltd. Shanghai Tel.: Fax: info@hcn.haldex.com France Haldex France S.A.R.L. Weyersheim (Strasbourg) Tel.: Fax: info.heu@haldex.com Germany Haldex Brake Products GmbH Denkendorf (Stuttgart) Tel.: Fax: info@hde.haldex.com Haldex Brake Products GmbH Heidelberg Tel.: Fax: info@hbpde.haldex.com Hungary Haldex Hungary Kft. Szentlörinckáta Tel.: Fax: info.hu.eu@haldex.com India Haldex India Limited Nasik Tel.: Fax haldex@haldexindialtd.com Italy Haldex Italia Srl. Muggio (MI) Tel.: Fax: info@hit.haldex.com Poland Haldex Sp.z.o.o. Praszka Tel.: Fax: info@haldex.net.pl South Korea Haldex Korea Ltd. Seoul Tel.: Fax: info@hkr.haldex.com Spain Haldex España S.A. Parets del Valles (Barcelona) Tel.: Fax: haldexespana@haldex.es Sweden Haldex Brake Products AB Landskrona Tel.: Fax: info@hbpse.haldex.com United-Kingdom Haldex Ltd. Newton Aycliffe Tel.: Fax: aycliffe.info@haldex.com Haldex Brake Products Ltd. Redditch Tel.: Fax: info@haldex.com USA Haldex Brake Products Corp. Kansas City MO Tel.: Fax: hbsna@haldex.com Haldex is an innovator in vehicle technology and supplies proprietary products for trucks, cars and industrial vehicles on a global basis. Haldex is listed on the Stockholm Stock Exchange and has annual sales exceeding 7 billion SEK with.0 employees worldwide. Innovative Vehicle Technology Art.nr nd Edit. / / Landskrona

Ball & Spring Posi-lock Cranked Arm and Double Arm types.

The Haldex range of Manual Slack Adjusters consists of : Ball & Spring Posi-lock Cranked Arm and Double Arm types. This catalogue contains : Technical descriptions Applications Cross-References 000 700