Piston arrangement

1. A piston arrangement comprising:

a piston with a piston head;

a piston skirt with a circumferential surface; and

a connecting rod, which is connected with the piston via a ball joint including a ball, and penetrated by an oil supply channel, which is connected with a bearing surface of the ball joint;

wherein, via an oil path, the oil supply channel is connected with a lubrication groove formed in the circumferential surface;

wherein the ball is held in the piston by means of a fixing element, which delimits at least a part of the oil path; and

wherein the fixing element has a circumferential wall, which forms, at least at a section originating from the piston head, a gap to the piston skirt, which is connected with the lubrication groove via at least one opening.

2. The piston arrangement according to claim 1 , wherein the lubrication groove is connected with an annular chamber, which is formed between the piston skirt and the fixing element and closed in relation to the gap, said annular chamber being connected with the inside of the piston via an outlet opening formed in the fixing element.

3. A piston arrangement comprising:

a piston with a piston head;

a piston skirt with a circumferential surface; and

a connecting rod, which is connected with the piston via a ball joint including a ball, and penetrated by an oil supply channel, which is connected with a bearing surface of the ball joint;

wherein, via an oil path, the oil supply channel is connected with a lubrication groove formed in the circumferential surface; and

wherein the piston is made of reshaped metal sheet and the ball is supported in a bearing area of a reinforcement element, which bears on the piston head, and the oil path is led through the reinforcement element.

4. The piston arrangement according to claim 3 , wherein the oil path has a cooling section, which extends on a side of the piston head facing the ball joint.

5. The piston arrangement according to claim 4 , wherein the cooling section extends between the reinforcement element and the piston head.

6. The piston arrangement according to claim 5 , wherein the cooling section is formed by grooves in a frontside of the reinforcement element, which bears on the piston head.

7. The piston arrangement according to claim 3 , wherein the bearing area is made to be spherical, the bearing area having a radius, which is larger than the radius of the ball.

8. A piston arrangement comprising:

a piston with a piston head;

a piston skirt with a circumferential surface; and

a connecting rod, which is connected with the piston via a ball joint including a ball, and penetrated by an oil supply channel, which is connected with a bearing surface of the ball joint;

wherein, via an oil path, the oil supply channel is connected with a lubrication groove formed in the circumferential surface;

wherein the ball is held in the piston by means of a fixing element, which delimits at least a part of the oil path; and

wherein the fixing element only acts between the piston skirt and the ball.

9. A piston arrangement comprising:

a piston with a piston head;

a piston skirt with a circumferential surface; and

a connecting rod, which is connected with the piston via a ball joint including a ball, and penetrated by an oil supply channel, which is connected with a bearing surface of the ball joint;

wherein, via an oil path, the oil supply channel is connected with a lubrication groove formed in the circumferential surface; and

wherein the ball is held in the piston by means of a fixing element, and the fixing element forms a surface gap with a reinforcement element, at least in a section radially outside the ball joint.

10. The piston arrangement according to claim 9 , wherein the surface gap has the shape of a cone section, the top of the cone pointing away from the piston head.

11. The piston arrangement according to claim 9 , wherein the surface gap ends in an annular gap with a larger thickness than the surface gap, which surrounds the ball and is connected with the bearing surface between the ball and the fixing element.

12. A piston arrangement comprising:

a piston with a piston head;

a piston skirt with a circumferential surface; and

a connecting rod, which is connected with the piston via a ball joint including a ball, and penetrated by an oil supply channel, which is connected with a bearing surface of the ball joint;

wherein, via an oil path, the oil supply channel is connected with a lubrication groove formed in the circumferential surface;

wherein the ball is held in the piston by means of a fixing element, which delimits at least a part of the oil path; and

wherein the fixing element is connected with the piston at the end of the piston skirt facing away from the piston head.

13. The piston arrangement according to claim 12 , wherein the end of the piston skirt has a reduced diameter.