Planetary manual transmission
A mechanical clutch-controlled planetary transmission employs three planetary gearsets and seven synchronizer clutches to establish fifteen forward speed ratios and seven reverse speed ratios between a transmission input shaft and a transmission output shaft. Two of the planetary gearsets each provide three forward speed ratios including two underdrives and a direct drive, and a third of the planetary gearsets provides a reverse speed ratio, an underdrive speed ratio, a direct speed ratio, and an overdrive speed ratio.
1. A planetary transmission comprising:
an input shaft;
an output shaft;
a housing;
a first planetary gearset having a first member, a second member, a third member, and a fourth member, said first and fourth members being continuously interconnected to rotate in unison;
a second planetary gearset having a first member, a second member, a third member, and a fourth member, said first and fourth members being continuously interconnected to rotate in unison;
a third planetary gearset having a first member, a second member, and a third member;
a first mechanical clutch means for selectively interconnecting said input shaft with said first member or said second member, or both said first and said second members of said first planetary gearset;
a second mechanical clutch means for selectively interconnecting said housing with said fourth member or said second member of said first planetary gearset;
a third mechanical clutch means for selectively interconnecting said third member of said first planetary gearset with said first member or said second member of both said first member and said second member of said second planetary gearset;
a fourth mechanical clutch means for selectively connecting said housing with said second member or said fourth member of said second planetary gearset;
a fifth mechanical clutch means for selectively connecting said third member of said second planetary gearset with said first member, said second member, or said third member of said third planetary gearset;
a sixth mechanical clutch means for selectively connecting said first member or said third member of said third planetary gearset with said housing; and
a seventh mechanical clutch means for selectively connecting said second member or said third member of said third planetary gearset with said output shaft.
2. The planetary transmission defined in claim 1 , further comprising:
said mechanical clutch means being engaged in combinations of four to establish one forward speed ratio, in combinations of five to establish one reverse speed ratio and four forward speed ratios, in combinations of six to establish four reverse speed ratios and five forward speed ratios, and in combinations of seven to establish two reverse speed ratios and five forward speed ratios through said planetary gearset between said input shaft and said output shaft.
3. The planetary transmission defined in claim 1 , further comprising:
said first members of each of said planetary gearsets being a sun gear member, said second members of each of said planetary gearsets being a ring gear member, and said third members of each of said planetary gearsets being a planet carrier member.
4. The planetary transmission defined in claim 3 , further comprising:
said fourth member of both of said first and second planetary gearsets being sun gear members.