PEP 15 - Auto Slack Adjusters

Slack Adjusters

E P RODUCT MPHASIS ROGRAM

P

6

7

9

6. Rotation back through elasticity angle “C” The return springs hold the toe of the rack down against the bottom of the notch in the control disk . The rack turns the one way 17 & 18 24

14

4

7. Rotation back into the clearance angle “A” As the pressure of brake linings on the drum drops, so does the torque on the camshaft, worm wheel and worm screw , allowing the coil spring to re- extend and push the worm screw back into the cone clutch housing , thus re-engaging the torque sensitive clutch. 21 9 14 4

9

4

18

clutch assembly freely because the cone clutch is disengaged. 9

4 &

17

24

21

8

9

19

9

6

9. Eliminating the slack with rotation back through the excess clearance angle “B” As the ASA finishes the rotation back to its starting position, the rack is prevented from moving with it by the toe of the rack, which is pressing against the top of the notch in the anchored control disk . As the ASA rotates, the teeth in the stationary rack rotate the pinnion in the one-way clutch assembly and, because both clutches are now engaged, the worm screw is turned with it. The worm screw turns the worm wheel and the worm wheel turns the camshaft. Such rotation of the camshaft reduces the lining and brake drum. 19 24 6 9 21

19

24

21

24

8. Rotation back through the clearance angle “A” As the ASA rotates back, the toe of the rack is lifted from contact with the bottom of the notch in the control disk to contact with the top of the notch. 19 24

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