| 摘要 |
A two speed drive system for rotatable devices having large moments of inertia. The drive system has two input driving members each of which is adapted to be driven as an input drive member. One of said members being a first speed driving member an the other of said members being a second speed driving member. The two driving members are coaxial with respect to each other and carry inner races for respective one-way over-running input clutches. An output drive member is also disposed coaxially with respect to the input drive members and carries an inner race for a one-way over-running clutch. A cylindrical outer race is disposed about the inner races of the first input drive member, the second input drive member and the output drive member. One-way drive means are disposed between the respective inner and outer races to complete the clutches. The first and second speed drive member drive from the inner to the outer races while the output drive member drives from the outer to the inner race.
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