Crank pin, ball joint and corresponding wiper actuating linkage system and method for the assembly thereof

1 . A crank pin of a wiper linkage system, comprising:

a connecting rod associated with the crank pin;

the crank pin being configured to be received in a complementary internal cavity of a ball joint housing of the wiper linkage system, wherein a truncated spherical portion has a spherical sector and a truncated sector, and

the crank pin having opposing cylindrical ends with a first longitudinal end portion and a second longitudinal end portion, where the truncated spherical portion is situated axially between the opposing ends of the first longitudinal end portion and the second longitudinal end portion.

2 . The crank pin of claim 1 , wherein the truncated sector is realized by a flat feature.

3 . The crank pin of claim 2 , wherein the truncated spherical portion has:

at least two opposite spherical sectors and

at least two opposite flats realized on two parallel planes.

4 . The crank pin of claim 3 , wherein the at least two spherical sectors of the truncated spherical portion extend respectively over an angular sector of less than or equal to 90°.

5 . The crank pin of claim 3 , wherein the crank pin has an elongate overall shape along a longitudinal axis passing through a center of the truncated spherical portion, wherein two opposite flats are symmetric with respect to a median plane passing through the center of the truncated spherical portion and containing the longitudinal axis (B) of the crank pin.

6 . The crank pin of claim 1 , having an elongate overall shape along a longitudinal axis (B) passing through a center of the truncated spherical portion.

7 . The crank pin of claim 6 , having a truncated cylindrical portion which is arranged in the axial continuation of the spherical portion and has a truncated sector in the continuation of a truncated sector of the truncated spherical portion.

8 . The crank pin of claim 6 , having a first longitudinal end portion and a second longitudinal end portion, the truncated spherical portion being situated axially between the first and second longitudinal end portions.

9 . A ball joint housing for a connecting rod of a wiper actuating linkage system, the ball joint housing having an internal cavity configured to receive a complementary crank pin of claim 1 , wherein the internal cavity has at least one first holding portion for holding the crank pin and a second opening portion that increases a dimension of the internal cavity.

10 . The ball joint housing of claim 9 , wherein the first portion defines a spherical portion.

11 . The ball joint housing of claim 9 , wherein the internal cavity has at least two opposite first, holding portions and at least two opposite second, opening portions such that the maximum distance between the two second portions is greater than the maximum distance between the two first portions.

12 . The ball joint housing of claim 9 , having an elongate overall shape along a longitudinal axis passing through the center of the internal cavity.

13 . The ball joint housing of claim 12 , wherein the internal cavity has a cavity bottom of cylindrical overall shape centered on the longitudinal axis of the ball joint housing.

14 . A wiper actuating linkage system having

a connecting rod that has an elongate overall shape, wherein the connecting rod has a ball joint housing at one longitudinal end, comprising:

an internal cavity configured to receive a complementary crank pin of claim 1 in a predefined angular assembly position,

the internal cavity having a first holding portion for holding the crank pin and a second opening portion that increases a dimension of the internal cavity;

wherein a spherical sector of a truncated spherical portion of the crank pin is arranged so as to bear against the facing first holding portion of the ball joint housing.

15 . A method for assembling a connecting rod of the linkage system of a wiper actuating linkage system, having a ball joint housing at one longitudinal end, wherein the method comprises:

inserting a crank pin into an internal cavity of the ball joint housing that is carried by the connecting rod through a relative translational movement, such that a spherical sector of a truncated spherical portion of the crank pin is arranged next to a second opening portion of the internal cavity of the ball joint housing, and such that the truncated sector of the truncated spherical portion of the crank pin is arranged next to a first, holding portion of the internal cavity of the ball joint housing; and

carrying out a relative rotational movement between the crank pin and the ball joint housing, as far as a predefined angular assembly position in which the spherical sector of the truncated spherical portion of the crank pin is next to the first holding portion of the internal cavity of the ball joint housing.