Accelerator pedal module

Accelerator pedal module comprising:

• a support member that is adapted to be fixed to a body of a vehicle;
• an accelerator pedal that is engaged with the support member rotatably and pressed by a driver;
• a spring having one end that is received by the support member and biases the accelerator pedal in a direction opposite to a pressing direction of the accelerator pedal;
• a rotor that is arranged on an end of the accelerator pedal on a spring side and has a convex surface;
• and
• a holder that is interposed between the spring and the rotor, has a concave surface contacting the convex surface, and receives the other end of the spring, wherein:
• the holder includes a receiving portion that receives the other end of the spring, the receiving portion is disposed farther from the one end of the spring, along an expansion direction of the spring, than a contact point at which the convex surface of the rotor and the concave surface of the holder contact each other, and the receiving portion is perpendicular to a bias direction of the spring;
• the other end of the spring is received by the receiving portion so that the other end of the spring is farther from the one end of the spring, along the expansion direction of the spring, than the contact point;
• a rotation axis direction of the accelerator pedal is defined as Z axis, the expansion direction of the spring is defined as Y axis, and a direction perpendicular to both of the Z axis and the Y axis is defined as X axis;
• a radius of curvature of a cross section of the convex surface in a proximity of the contact point on a X-Y plane containing the contact point is defined as r1;
• a radius of curvature of a cross section of the concave surface in the proximity of the contact point on the X-Y plane containing the contact point is defined as r2;
• a radius of curvature of the cross section of the convex surface in the proximity of the contact point on a Y-Z plane containing the contact point is defined as r3;
• a radius of curvature of the cross section of the concave surface in the proximity of the contact point on the Y-Z plane containing the contact point is defined as r4;
• a relationship of r4>r3>r2>r1 is satisfied;
• and
• the holder is movable with the other end of the spring without directly contacting the support member.