Speed increasing bidirectional mechanical converter

A screwdriver, comprising:

• a rod;
• a speed increasing bidirectional mechanical converter, comprising:
• a main shaft, which is coaxially arranged with the rod;
• a speed increasing planet gear unit, which includes a first ring gear, a planet gear, a sun gear and a planet carrier, wherein the planet gear is mounted on the planet carrier, the planet gear is arranged between the first ring gear and the sun gear, and the first ring gear rotates in an opposite direction against the sun gear;
• a handle, which is coaxially arranged with the first ring gear and used for inputting torque;
• wherein the speed increasing bidirectional mechanical converter further includes
• a reversing means, including a first one-way clutch and a second one-way clutch with same functioning directions, via which the first ring gear and the sun gear drive the main shaft;
• when in use, the planet carrier is kept still, and the rod rotates in a preset direction no matter a clockwise or anticlockwise torque is applied to the first ring gear by the handle;
• wherein the speed increasing bidirectional mechanical converter further includes a second ring gear which is coaxially arranged with the first ring gear and connected to the first one-way clutch wherein the first ring gear and the second ring gear are fixed relative to one another for fixed rotation together;
• and
• wherein the speed increasing bidirectional mechanical converter further includes a third ring gear which is engaged with the second one-way clutch, coaxially arranged with the sun gear and fixed relative to the sun gear for fixed rotation therewith.