MANUAL TRANSMISSIONS

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					MANUAL TRANSMISSIONS

           Chapter 4
           Classroom Manual
              – Page 67
             Lab Manual
              – Page 105

                             CBC
                          AUTOMOTIVE
                              RK
                             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
                              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
                  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
                                          CBC
  housing.                             AUTOMOTIVE
                                         RK
             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
             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
                       Page 69                AUTOMOTIVE
                                                  RK
          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
                     Page 69            AUTOMOTIVE
                                            RK
                       SYNCHRONIZERS

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

                                              CBC
                         Page 70           AUTOMOTIVE
                                               RK
SYNCHRO OPERATION




                 CBC
    Page 71   AUTOMOTIVE
                  RK
SYNCHRO OPERATION




                 CBC
    Page 72   AUTOMOTIVE
                  RK
SYNCHRO OPERATION




                 CBC
    Page 72   AUTOMOTIVE
                  RK
     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
                                      CBC
                  Page 73 - 74     AUTOMOTIVE
                                       RK
                   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
                        Page 75        AUTOMOTIVE
                                           RK
BASIC OPERATION




              CBC
           AUTOMOTIVE
 Page 77
               RK
         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
                    Page 79            AUTOMOTIVE
                                           RK
DETENT & INTERLOCK




                 CBC
    Page 79   AUTOMOTIVE
                  RK
SHIFT RAIL TYPICAL




               Page 79

                CBC
             AUTOMOTIVE
                 RK

				
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posted:10/6/2011
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