| 摘要 |
A wrench comprises a working portion (1) and a handle (2). The working portion (1) comprises a main shaft (5) perpendicular to the handle (2), and a bidirectional pawl (7) and a ratchet wheel (10) both fitting each other. The ratchet wheel (10) is configured to be driven by the handle (2). The bidirectional pawl (7) is configured to be capable of driving the main shaft (5) to rotate. The bidirectional pawl (7) has a first pawl (12) and a second pawl (13) both opposite to the clutch direction of the ratchet wheel (10). The working portion (1) also comprises a reversing apparatus used for setting the clutch direction of the bidirectional pawl (7) and the ratchet wheel (10). The reversing apparatus is configured to enable the first pawl (12) and the second pawl (13) to be selectively combined with the ratchet wheel (10), so that when the handle (2) rotates in the direction set by the reversing apparatus, the ratchet wheel (10) and the bidirectional pawl (7) are combined to drive the main shaft (5) to rotate. When the handle (2) rotates in the direction opposite to the direction set by the reversing apparatus, the ratchet wheel (10) and the bidirectional pawl (7) slip with each other and the main shaft (5) remains still. The working portion (1) also comprises a planetary gear speeding up mechanism acting on the main shaft (5). The planetary gear speeding up mechanism comprises a sun gear (14), a planet gear (15), and a gear ring (16). The sun gear (14) is configured to be capable of driving the main shaft (5) to rotate together, a rotating ring (4) is configured to be capable of driving the planet gear (15) to rotate, and the gear ring (16) is fixedly connected to the handle (2), so that when the handle (2) is held and the rotating ring (4) is rotated, the planetary gear speeding up mechanism speeds up the rotation input by the rotating ring (4) and outputs the rotation through the main shaft (5). |
