Manual transmission for motor vehicle

A manual transmission for motor vehicles, comprising:

• a transmission housing;
• an input shaft rotatably mounted within said transmission housing and having a first drive gear of small diameter for low speed drive and a second drive gear of large diameter for high speed drive fixed thereon;
• an output shaft rotatably mounted within said transmission housing in parallel with said input shaft;
• a first countershaft rotatably mounted within said transmission housing and arranged in parallel with said input and output shafts at one side thereof, said first countershaft having a first driven gear fixed thereon and continuously engaged with said first drive gear on said input shaft;
• and
• a second countershaft rotatably mounted within said transmission housing and arranged in parallel with said input and output shafts at the other side thereof, said second countershaft having a second driven gear fixed thereon and continuously engaged with said second drive gear on said input shaft;
• wherein a first change-speed driven gear is fixed on a portion of said output shaft extending into an extension housing fastened to one end of said transmission housing, and second and third change-speed driven gears are fixed on said output shaft within said transmission housing, and wherein a first forward drive gear is rotatably mounted on one end of said first countershaft extending into said extension housing and continuously engaged with said first change-speed driven gear, a first synchronizer coupling is provided on the one end of said first countershaft to selectively connect said first forward drive gear to said first countershaft, second and third forward drive gears are rotatably mounted on said first countershaft within said transmission housing and continuously engaged with said second and third change-speed driven gears, a second synchronizer coupling is provided on said first countershaft to selectively connect said second and third forward drive gears to said first countershaft, fourth and fifth forward drive gears are rotatably mounted on said second countershaft within said transmission housing and continuously engaged with said second and third change-speed driven gears, and a third synchronizer coupling is provided on said second countershaft to selectively connect said fourth and fifth forward drive gears to said second countershaft.

A manual transmission for motor vehicles, comprising:

• a transmission housing;
• an input shaft rotatably mounted within said transmission housing and having a first drive gear of small diameter for low speed drive and a second drive gear for large diameter for high speed drive fixed thereon, said first drive gear being axially spaced from said second drive gear;
• an output shaft rotatably mounted within said transmission housing in parallel with said input shaft and having at least a pair of axially spaced change-speed driven gears mounted thereon and located between said first and second drive gears on said input shaft;
• a first countershaft rotatably mounted within said transmission housing and arranged in parallel with said input and output shafts at one side thereof, said first countershaft having a first driven gear fixed thereon and continuously engaged with said first drive gear on said input shaft, a pair of axially spaced low speed drive gears rotatably mounted thereon and continuously engaged with the change-speed driven gears on said output shaft, and a first synchronizer coupling provided thereon to selectively connect said low speed drive gears to said first countershaft;
• and
• a second countershaft rotatably mounted within said transmission housing and arranged in parallel with said input and output shafts at the other side thereof, said second countershaft having a second driven gear fixed thereon and continuously engaged with said second drive gear on said input shaft, a pair of axially spaced high speed drive gears rotatably mounted thereon and continuously engaged with the change-speed driven gears on said output shaft, and a second synchronizer coupling provided thereon to selectively connect said high speed drive gears to said second countershaft.