Vehicle coupler, coupler tongue and coupler body

A coupler body comprising

• an upper traction platform,
• a lower traction platform,
• an upper impact platform,
• a lower impact platform,
• a pin hole and
• a lock chamber,
• wherein a section T of a traction surface of the upper traction platform and a section U of a traction surface of the lower traction platform are obtained by sectioning the coupler body along any vertical plane passing through an axis of the pin hole;
• and
• a perpendicular distance between a point on the section T farthest from the lower traction platform and the axis of the pin hole is defined as k0, and a perpendicular distance between a point on the section U farthest from the upper traction platform and the axis of the pin hole is defined as m0, and n0=1k0−m01, and 10 mm≤n0≤25 mm.

A coupler, comprising a coupler knuckle and a coupler body, wherein

• the coupler knuckle comprises
• an upper traction platform of the coupler knuckle,
• a lower traction platform of the coupler knuckle,
• an upper impact platform of the coupler knuckle,
• a lower impact platform of the coupler knuckle,
• a pin hole of the coupler knuckle and
• a neck portion,
• wherein a section R of a traction surface of the upper traction platform of the coupler knuckle and a section S of a traction surface of the lower traction platform of the coupler knuckle are obtained by sectioning the coupler knuckle along any vertical plane passing through an axis of the pin hole of the coupler knuckle;
• and
• a perpendicular distance between a point on the section R closest to the neck portion and the axis of the pin hole of the coupler knuckle is defined as k, and a perpendicular distance between a point on the section S closest to the neck portion and the axis of the pin hole of the coupler knuckle is defined as m, and n=|k−m|, and 10 mm≤n≤25 mm;
• and, the coupler body comprise:
• an upper traction platform of the coupler body,
• a lower traction platform of the coupler body,
• an upper impact platform of the coupler body,
• a lower impact platform of the coupler body,
• a pin hole of the coupler body and
• a lock chamber,
• wherein a section T of a traction surface of the upper traction platform of the coupler body and a section U of a traction surface of the lower traction platform of the coupler body are obtained by sectioning the coupler body along any vertical plane passing through an axis of the pin hole of the coupler body;
• and
• a perpendicular distance between a point on the section T farthest from the lower traction platform of the coupler body and the axis of the pin hole of the coupler body is defined as k0, and a perpendicular distance between a point on the section U farthest from the upper traction platform of the coupler body and the axis of the pin hole of the coupler body is defined as m0, and n0=1k0−m01, and 10 mm≤n0≤25 mm.