Ratchet Wrench Structure

A ratchet wrench structure comprising:

• a wrench body, a ratchet wheel, a pawl member, an elastic member, and a snap ring;
• wherein:
• the wrench body is provided with a first receiving recess, a second receiving recess, and a first annular groove;
• the second receiving recess is located beside the first receiving recess;
• the second receiving recess has an axis arranged in the first receiving recess;
• the second receiving recess has a closed top and a closed bottom;
• the second receiving recess is connected to the first receiving recess;
• the first receiving recess has a bottom provided with an abutting edge;
• the first receiving recess is provided with a first circular arc;
• the first circular arc has a first axis;
• a first vertical line passes through the first axis;
• the first circular arc has a first radius;
• the second receiving recess is provided with a second circular arc;
• the second circular arc has a second axis;
• the second axis and the first vertical line coincide at one point;
• the second circular arc has a second radius;
• a first distance is defined between the first axis and the second axis;
• the ratchet wheel is pivotally mounted in the first receiving recess and has a periphery provided with a ratchet toothed portion arranged in an annular manner;
• the ratchet wheel is provided with a mounting portion;
• the ratchet wheel is provided with a second annular groove aligning with the first annular groove;
• the ratchet wheel is provided with an abutting portion with a reduced diameter;
• the abutting portion rests on the abutting edge;
• the ratchet toothed portion has an upper end provided with a first guide angle and a lower end provided with a second guide angle;
• the first guide angle has a trapezium shape;
• the second guide angle has an oblique shape;
• the pawl member is mounted in the second receiving recess;
• the pawl member has a front provided with an engaging toothed portion meshing with the ratchet toothed portion;
• the engaging toothed portion has a side provided with an extension face;
• the pawl member has a rear provided with an arcuate abutting face;
• the pawl member has a side provided with a curved surface;
• the curved surface rests on a wall of the second receiving recess;
• the curved surface connects the arcuate abutting face or a round corner is defined between the curved surface and the arcuate abutting face;
• the engaging toothed portion is provided with a third circular arc;
• the third circular arc has a third axis;
• a second vertical line passes through the third axis;
• the engaging toothed portion is arranged at a side of the second vertical line;
• the curved surface forms a fourth circular arc;
• the fourth circular arc has a fourth axis;
• the fourth axis and the second vertical line coincide at one point;
• a second distance is defined between the third axis and the fourth axis;
• the third circular arc and the first circular arc have the same diameter;
• the third axis and the first axis coincide mutually;
• the second vertical line and the first vertical line coincide;
• the fourth circular arc and the second circular arc have the same diameter;
• the fourth axis and the second axis coincide mutually;
• the third circular arc has a radius equal to the first radius;
• the fourth circular arc has a radius equal to the second radius;
• the engaging toothed portion matches the first receiving recess, and the curved surface matches the second receiving recess;
• the arcuate abutting face is provided with a fifth circular arc;
• the fifth circular arc has a fifth axis;
• the fifth axis is located outside of a circle of the fourth circular arc;
• the fifth axis and the second vertical line coincide at one point;
• the third axis, the fourth axis, and the fifth axis coincide with the second vertical line at one point;
• the fifth circular arc has a third radius;
• a third distance is defined between the fifth axis and the third axis;
• the extension face has a radius more than that of the third circular arc;
• the third axis is an axis of the extension face;
• a fourth distance is defined between a radius of the extension face and that of the third circular arc;
• the fourth distance is less than a half of a tooth height of the engaging toothed portion;
• each of the first radius, the second radius, and the first distance has an integer value;
• the third radius preferably has an integer value;
• the third radius is more than the first radius;
• the first radius is more than the second radius;
• the second radius is more than the first distance;
• the second distance is equal to the first distance;
• the third distance is equal to the second distance;
• the third radius is less than double of the first radius;
• the first radius is 1.20 to 1.30 times of the second radius or the first radius is 1.25 times of the second radius;
• the second radius is 1.4 to 1.5 times of the first distance or the second radius is 1.4 to 1.45 times of the first distance;
• the elastic member is received in the second receiving recess and has a first end and a second end;
• the first end has a diameter more than that of the second end;
• the elastic member has a conic shape by a diameter differential of the first end and the second end;
• the diameter of the first end is equal to a height of the second receiving recess, to prevent the elastic member from being moved upward and downward in the second receiving recess;
• the first end presses the wall of the second receiving recess;
• the second end presses the arcuate abutting face;
• the curved surface presses the wall of the second receiving recess;
• a space between the second receiving recess and the arcuate abutting face has a maximum value by a position relation between the fifth circular arc and the second circular arc, an axis relation between the fifth axis and the second axis, and a radius relation between the third radius and the second radius;
• the elastic member is disposed at a middle of the second receiving recess;
• the first vertical line passes through the elastic member;
• the snap ring is C-shaped;
• and
• the snap ring is received in the first annular groove and the second annular groove, so that the ratchet wheel is retained in the first receiving recess.