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Chapter 09 - Chapter 9 Reaction and Friction Units Upon...

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Chapter 9 Reaction and Friction Units Upon completion and review of this chapter, the student should be able to: Classroom Manual Objectives Describe the purpose and operation of the common reaction members. Explain how a brake band works and what its purpose is. Identify the basic components in a hydraulic servo and describe their function. Describe the different types of one-way clutches used in automatic transmissions. Explain how a roller-type or sprag-type, one-way clutch works. Identify the components in a hydraulic multiple disc clutch and describe their function. Describe the conditions required for automatic shifting. List the conditions that may have an effect on shift feel. Explain the purpose and operation of an accumulator and modulator valve. Shop Manual Objectives Inspect and replace bands and drums. Adjust bands, internally and externally. Inspect and replace servo including bore, piston, seals, pin, spring, and retainers and repair or replace as necessary. Inspect an accumulator bore, piston, seals, spring, and retainers, while the transmission is in or out of the vehicle. Inspect and service clutch drum, piston, check-balls, springs, retainers, seals, and friction and pressure plates. Measure and adjust clutch pack clearance. Air test the operation of the clutch pack and servo assemblies. Inspect and service roller and sprag clutch, races, rollers, sprags, springs, cages, and retainers. Overview This chapter in both manuals covers the construction, purpose, and service of the various clutches and brakes used in transmissions and transaxles. Reading Assignments Classroom Manual, pages 281-308 Shop Manual, pages 371-403 59
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Terms to Know Cantilever Clutch volume index (CVI) Coast Dual band Fulcrum Over-center spring Pressure plate Selective servo apply pins Split-band Steel discs Steels Transmission tune- up Lecture Outline and Notes I. Objectives Review the chapter’s objectives. II. Reaction Members Discuss the importance of reaction members with regard to gear ratio changes in the planetary gearset. III. Friction and Reaction Units Discuss the purposes of clutches and brakes and explain how each of them works to connect or hold members of the planetary gearset. IV. Brake Bands A.Purpose and Construction 1. Describe the different types of bands used and explain their applications.
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