A resistance supplier for weight training comprising:
- a spindle having
- an axial direction;
- a first rotating direction;
- and
- a second rotating direction being reverse to the first rotating direction;
- a first transmission unit rotatably mounted around the spindle;
- an input assembly having
- a one-way input bearing being capable of driving the first transmission unit to rotate along the first rotating direction;
- and
- a pulling rope connected to the one-way input bearing;
- the pulling rope being capable of driving the first transmission unit to rotate along the first rotating direction via the one-way input bearing;
- a first planetary gear set having
- a first sun gear rotatably mounted around the spindle;
- multiple first planet gears engaging with the first sun gear;
- two first planet carriers;
- each of the first planet carriers connected to axles of the first planet gears;
- in the axial direction, the two first planet carriers respectively located in two sides of the first planet gears;
- and
- a first ring gear engaging with the first planet gears;
- a first switching assembly having
- a first switching unit being capable of moving along the axial direction relative to the first transmission unit and the first planetary gear set;
- a first rotating unit mounted around the first transmission unit;
- the first transmission unit being capable of driving the first rotating unit to rotate;
- in the axial direction, the first switching unit abutting two sides of the first rotating unit and being capable of driving the first rotating unit to move along the axial direction relative to the first transmission unit and the first planetary gear set;
- the first rotating unit having
- at least one first driving segment being capable of moving along with the first rotating unit relative to the first planetary gear set to connect to one of the two first planet carriers, or to connect to the first ring gear;
- and
- a first fixing unit securely mounted on the first switching unit and being capable of moving along with the first switching unit relative to the first planetary gear set;
- the first fixing unit having
- at least one first fixing segment being capable of moving along with the first fixing unit relative to the first planetary gear set to connect to and fix one of the two first planet carriers, or to connect to and fix the first ring gear;
- wherein when the at least one first driving segment abuts one of the two first planet carriers, the at least one first fixing segment abuts and fixes the first ring gear, and the first rotating unit is capable of driving said one of the two first planet carriers to rotate via the at least one first driving segment, and then said one of the two first planet carriers drives the first sun gear to rotate;
- and
- wherein when the at least one first driving segment abuts the first ring gear, the at least one first fixing segment abuts and fixes one of the two first planet carriers, and the first rotating unit is capable of driving the first ring gear to rotate via the at least one first driving segment, and then the first ring gear drives the first sun gear to rotate;
- a second transmission unit rotatably mounted around the spindle and securely mounted on the first sun gear;
- a second planetary gear set having
- a second sun gear;
- the second transmission unit rotatably mounted through the second sun gear;
- multiple second planet gears engaging with the second sun gear;
- two second planet carriers;
- each of the two second planet carriers connected to axles of the second planet gears;
- in the axial direction, the two second planet carriers respectively located in two sides of the second planet gears;
- and
- a second ring gear engaging with the second planet gears;
- a second switching assembly having
- a second switching unit being capable of moving along the axial direction relative to the second transmission unit and the second planetary gear set;
- a second rotating unit mounted around the second transmission unit;
- the second transmission unit being capable of driving the second rotating unit to rotate;
- in the axial direction, the second switching unit abutting two sides of the second rotating unit and being capable of driving the second rotating unit to move along the axial direction relative to the second transmission unit and the second planetary gear set;
- the second rotating unit having
- at least one second driving segment being capable of moving along with the second rotating unit relative to the second planetary gear set to connect to one of the two second planet carriers, or to connect to the second ring gear, or not to connect to any one of the two second planet carriers and the second ring gear;
- and
- a second fixing unit securely mounted on the second switching unit and being capable of moving along with the second switching unit relative to the second planetary gear set;
- the second fixing unit having
- at least one second fixing segment being capable of moving along with the second fixing unit relative to the second planetary gear set to connect to and fix one of the two second planet carriers, or to connect to and fix the second ring gear, or not to connect to any one of the two second planet carriers and the second ring gear;
- wherein when the at least one second driving segment abuts one of the two second planet carriers, the at least one second fixing segment abuts and fixes the second ring gear, and the second rotating unit is capable of driving said one of the two second planet carriers to rotate via the at least one second driving segment, and then said one of the two second planet carriers drives the second sun gear to rotate, and the at least one first driving segment abuts one of the two first planet carriers;
- wherein when the at least one second driving segment abuts the second ring gear, the at least one second fixing segment abuts and fixes one of the two second planet carriers, and the second rotating unit is capable of driving the second ring gear to rotate via the at least one second driving segment, and then the second ring gear drives the second sun gear to rotate, and the at least one first driving segment abuts the first ring gear;
- and
- wherein when the at least one second driving segment does not abut any one of the two second planet carriers and the second ring gear, the at least one second fixing segment does not abut any one of the two second planet carriers and the second ring gear, and the second rotating unit does not drive any one of the two second planet carriers and the second ring gear to rotate via the at least one second driving segment, and the at least one first driving segment abuts the first ring gear;
- an output assembly having
- a driven unit rotatably mounted on the second transmission unit and securely mounted on the second sun gear;
- an output unit securely mounted on the driven unit and securely mounted on the spindle;
- and
- a one-way output bearing having
- an output bearing outer ring securely mounted on the driven unit;
- and
- an output bearing inner ring securely mounted around the second transmission unit;
- the output bearing inner ring being capable of driving the output bearing outer ring and the driven unit to rotate along the first rotating direction;
- the output bearing inner ring being capable of rotating along the second rotating direction relative to the output bearing outer ring;
- and
- at least one weight securely mounted on the spindle and being capable of rotating along with the spindle.