Countertrack joint

A countertrack joint comprising:

• an outer joint part with a longitudinal axis, a joint base, defining a connecting side, and an opening defining an opening side, and first outer ball tracks and second outer ball tracks, which are arranged circumferentially distributed in an inner face of the outer joint part and which are at least partially curved in a longitudinal section;
• an inner joint part with a longitudinal axis, and first inner ball tracks and second inner ball tracks-which are arranged circumferentially distributed in an outer face of the inner joint part and which are at least partially curved in a longitudinal section;
• wherein the first outer ball tracks and the first inner ball tracks form first pairs of tracks with one another, which widen towards the opening side of the outer joint part,
• and wherein the second outer ball tracks and the second inner ball tracks form second pairs of tracks with one another, which widen towards the connecting side, wherein the second outer ball tracks have a second outer track baseline and, adjoining thereto, a second outer primary track section and a second outer secondary track section,
• a first ball in each first pair of tracks and a second ball in each second pair of tracks,
• a ball cage which is arranged between the outer joint part and the inner joint part and which has a cage inner face, a cage outer face and circumferentially distributed cage windows, which each receive at least one of the balls, wherein the balls at coaxially aligned longitudinal axes of the inner joint part and the outer joint part are held by the ball cage on a joint centre plane,
• wherein the inner joint part is angularly movable relative to the outer joint part, wherein the second balls-move within a primary track articulation angle range-up to a maximum primary track articulation angle of ±20° around the joint centre plane along the second outer primary track section, wherein a maximum primary joint articulation angle is defined as the joint articulation angle at which all balls are still just involved in the torque transmission between the outer joint part and the inner joint part before a ball travelling towards the opening side exits the associated pair of tracks on the opening side,
• wherein the second outer track baseline within the second outer primary track section has a greatest radial distance from the second longitudinal axis in a second offset plane parallel to the joint centre plane, wherein a second offset plane intersection point is defined between the second offset plane and the second outer track baseline,
• wherein a second outer radius-forming the second outer track baseline in the second offset plane defines a second outer reference arc,
• wherein the second outer track baseline, from the joint centre plane towards the joint base, runs at latest from a track articulation angle of ±20° radially within the second outer reference arc.