MANUAL TRANSMISSIONS

1
MANUAL TRANSMISSIONS

• Chapter 4
• Classroom Manual
• Page 67
• Lab Manual
• Page 105

CBC AUTOMOTIVE RK
2
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.

CBC AUTOMOTIVE RK
3
OBJECTIVES

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

CBC AUTOMOTIVE RK
4
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 AUTOMOTIVE RK
5
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.

Page 69
6
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.

CBC AUTOMOTIVE RK
Page 69
7
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.

CBC AUTOMOTIVE RK
Page 69
8
SYNCHRONIZERS

• Purpose to equalize shaft and gear speeds.
• Four types
• Hub
• Sleeve
• Blocking Ring
• Inserts or spring ball devices

CBC AUTOMOTIVE RK
Page 70
9
SYNCHRO OPERATION
CBC AUTOMOTIVE RK
Page 71
10
SYNCHRO OPERATION
CBC AUTOMOTIVE RK
Page 72
11
SYNCHRO OPERATION
CBC AUTOMOTIVE RK
Page 72
12
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 ODs

CBC AUTOMOTIVE RK
Page 73 - 74
13
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

CBC AUTOMOTIVE RK
Page 75
14
BASIC OPERATION
CBC AUTOMOTIVE RK
Page 77
15
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.

CBC AUTOMOTIVE RK
Page 79
16
DETENT INTERLOCK
CBC AUTOMOTIVE RK
Page 79
17
SHIFT RAIL TYPICAL
Page 79
CBC AUTOMOTIVE RK