MANUAL TRANSMISSIONS

Chapter 4 Classroom Manual

– Page 67 Lab Manual

– Page 105

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OBJECTIVES

Discuss the operation of typical manual transmissions.

Describe the purpose and operation of a synchronizer.

Discuss power flow through a manual transmission. Compare and contrast transmissions and transaxles.

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OBJECTIVES

Discuss power flow through a transaxle. Describe how gears are shifted. Identify accessories controlled by a manual trans. Discuss Gear oil.

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MANUAL TRANS

Purpose to keep engine in normal operating RPM range.

Manual transmissions and transaxles are fundamentally the same.

Can change gear ratios and reverse direction.

Transaxle includes differential in same housing. CBC

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SLIDING GEAR TRANS

Sliding spur gears. Gears go in & out of mesh.

– If gear speeds are different grinding will occur.– Typically used for reverse in both transmissions

and transaxles.

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COLLAR SHIFT TRANS

A collar shift trans has parallel shafts fitted with gears in constant mesh.– If gear speeds are different grinding will occur.– Used for Low gear on some older model

transmissions.

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SYNCHROMESH TRANS

A synchromesh transmission is a constant mesh, collar shift transmission equipped with synchronizers, which equalize the speed of the shafts and gears before they are engaged.

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SYNCHRONIZERS

Purpose to equalize shaft and gear speeds. Four types

– Hub– Sleeve– Blocking Ring– Inserts or spring & ball devices

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SYNCHRO OPERATION

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SYNCHRO OPERATION

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SYNCHRO OPERATION

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TRANSMISSION DESIGNS

Three-Speed Transmission Three-Speed Transmission /w add-on OD Four-Speed Transmission Four-Speed Transmission /w Internal OD Five-Speed Transmission /w Internal OD Six-Speed Transmission /w 2 Internal OD’s

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AFTERMARKET OD

Available for popular standard and automatic transmissions.

Expensive $1,000 to $2,000– Must shorten drive shaft.– Some are two speed.

» Direct and OD» Direct and UnderDrive

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BASIC OPERATION

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DETENT & INTERLOCK

Detent - a ball & spring used to hold a shift rail in position.

Interlock - a oval shaped device used between shift rails so only one gear at a time can be selected.

Rollpin or setscrew - used to attach a shift fork to a shift rail.

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DETENT & INTERLOCK

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SHIFT RAIL TYPICAL

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