Ratchet mechanism and hand tool

A ratchet mechanism, characterized by comprising:

• a first member having an annular surface provided with a plurality of teeth that are arranged parallel to its axial direction;
• a second member configured to be rotatable relative to a circumferential direction of the annular surface;
• and
• a plurality of drive transmission members arranged on the second member, each of the plurality of drive transmission members comprising at least one ratchet tooth, the plurality of drive transmission members being configured to be engaged with the plurality of teeth to transmit motion between the first member and the second member, wherein the plurality of drive transmission members comprises at least two first drive transmission members and at least two second drive transmission members, and when the first member and the second member move relative to each other in a first direction, the first drive transmission members are in working states, and the second drive transmission members are in non-working states, and when the first member and the second member move relative to each other in a second direction, the second drive transmission members are in working states, and the first drive transmission members are in non-working states;
• and wherein the first drive transmission members and the second drive transmission members are all separate members, or one of the first drive transmitting members and one of the second drive transmitting members are integrated into one member;
• and wherein each of the drive transmission members in the working states is in different engaged states with the teeth;
• wherein the second member comprises a plurality of receiving grooves for supporting the drive transmission members, at least one of the drive transmission members is arranged in each of the receiving grooves, each of the receiving groove has an opening facing the teeth, and at least part of a drive transmission member passes through the opening such that the drive transmission member is engaged with the teeth;
• and an elastic element is connected to the drive transmission member;
• wherein a contact surface of each of the receiving grooves with the drive transmission member received therein has a different inclination angle relative to a radial direction of the annular surface, such that the drive transmission members have different advance angles, so as to be in different engaged states with the teeth;
• wherein the teeth are located on an inner circumferential surface of the annular surface and the second member is located within a chamber defined by the annular surface;
• wherein the ratchet mechanism comprising an annular support provided at an end of the second member, wherein an elongated through hole is provided in the annular support at a position corresponding to a drive transmission member, one end of the drive transmission member extends into the elongated through hole, and an inclination angle of the elongated through hole relative to the radial direction is the same as that of the corresponding contact surface.