Inner joint member for counter track joint

Abstract

This relates to an internal joint member for a constant velocity joint in the form of a counter track joint. [Solution] The joint inner member (13) has a through opening equipped with an engagement structure for introducing a drive shaft from the front side (20) and an axial position fixing structure in the rear direction, a first ball track (23A) inclined toward the front side (20) and a second ball track (23B) inclined toward the rear side, and the joint inner member (13) has a recess (32) recessed relative to the bottom of the track in a circumferential section having at least the second ball track (23B) on the front side (20), and the radial thickness formed between the recess (32) and the through opening is less than 1.3 times the minimum radial thickness formed between the first ball track (23A) and the through opening on the front side (20).

Claims

1. An inner joint member (13) for a counter track joint, A through-opening (21) having a longitudinal axis (A13) and an engagement structure (38) into which a drive shaft (30) can be introduced axially from the front side (20) to transmit torque, wherein the through-opening (21) has an axial position fixing structure (31) between the central plane (EM) and the rear side (19) for fixing the position of the drive shaft (30) in the axial direction, The first ball track (23A) is inclined toward the front side (20) when viewed in the central plane (EM), and the joint inner member (13) has a minimum radial thickness (RA20) between the first ball track (23A) and the through opening (21) in the radial direction toward the front side (20), and the first ball track (23A) is inclined toward the front side (20), A second ball track (23B) is inclined toward the rear (19) when viewed from the aforementioned central plane (EM), Includes, The joint inner member (13) has a recess (32) in a circumferential section having at least the second ball track (23B), the recess is recessed relative to the virtually extended track bottom line (L29B) when viewed in a longitudinal section through the track bottom (29), and extends axially to the front side (20), the radial thickness (RB20) formed between the recess (32) and the through opening (21) at the front side (20) is less than 1.3 times the minimum radial thickness (RA20) formed between the first ball track (23A) and the through opening (21) at the front side (20), Joint inner member (13).

2. Each of the first ball tracks (23A) has a central section (23Ac) for guiding the ball (14A) to which it belongs during operation, a front section (23Af) extending toward the front end surface (27), and a rear section (23Ar) extending toward the rear end surface (28). The joint inner member according to claim 1, characterized in that the recess (32) is configured such that the minimum radial thickness (RB20) between the recess (32) and the through opening (21) is less than 1.1 times the minimum radial thickness (RA20) between the front section (23Af) of the first ball track (23A) and the through opening (21).

3. The joint inner member according to claim 1 or 2, characterized in that, with respect to the second ball track (23B), the radial thickness (RB20) formed between the recess (32) and the through opening (21) on the front side (20) is less than 1.3 times the minimum radial thickness (RB19) between the second ball track (23B) and the through opening (21) on the rear side (19).

4. The joint inner member according to any one of claims 1 to 3, characterized in that the recesses (32) each extend over a circumferential angle (α) of at least ±10° with respect to the radial plane (EB) defined by the track bottom line of the second ball track (23B) to which they belong, when viewed in the axial direction.

5. Each of the recesses (32) has a circumferential extension length that is smaller than the angular pitch between two adjacent web sections (25) in the circumferential direction. The joint inner member according to claim 4, characterized in that the web sections adjacent to each recess (32) in the circumferential direction continuously transition to the front end surface (27) of the joint inner member (13).

6. The joint inner member according to claim 5, characterized in that the recess (32) extends from the front end surface (27) over an axial length (L32) that is at least 0.1 times the axial length (L13) of the joint inner member (13).

7. The joint inner member according to claim 5 or 6, characterized in that the recess (32) has a rounded concave shape when viewed in a vertical cross-sectional view.

8. The joint inner member according to any one of claims 1 to 4, characterized in that the recess (32) is formed by an annular groove (33) arranged coaxially with respect to the longitudinal axis (A13) on the front end surface (27), and the annular groove (33) is arranged radially between the inner edge (36) and the outer edge (37) of the front end surface (27).

9. The joint inner member according to claim 8, characterized in that the annular groove (33) has a rounded contour when viewed in a longitudinal cross-sectional view.

10. The joint inner member according to claim 8 or 9, characterized in that the annular groove (33) has an axial depth of at least 0.1 times the axial length (L13) of the joint inner member (13), starting from the front end surface (27).

11. The joint inner member according to any one of claims 8 to 10, characterized in that the annular groove (33) intersects the front section (23Bf) of the first ball track (23A) in the circumferential direction.

12. The front portion (23Af) of the first ball track (23) is recessed in the region where it intersects with the annular groove (33) relative to the annular surface formed by the annular groove (33), as described in any one of claims 8 to 11.

13. The joint inner member according to any one of claims 8 to 12, characterized in that the annular groove (33) has a radial extension length (R33) that is at least 0.3 times the radial extension length (R27) from the inner edge (36) to the outer edge (37) of the front end surface (27) when viewed in a semi-longitudinal section view.

14. A constant velocity joint in the form of a counter track joint, A joint outer member (12) having a longitudinal axis (A12), a connecting side and an open side, and a first ball track (22A) and a second ball track (22B), The joint inner member (13) according to any one of claims 1 to 13, It has, The first ball track (22A) of the joint outer member (12) and the first ball track (23A) of the joint inner member (13) together form a first pair of ball tracks (22A, 23A), and the first pair of ball tracks expands toward the front side of the joint outer member (12) when the counter track joint is extended. The second ball track (22B) of the joint outer member (12) and the second ball track (23B) of the joint inner member (13) together form a second pair of ball tracks (22B, 23B), and the second pair of ball tracks expands toward the rear side (19) of the joint outer member (12) when the counter track joint is extended. Each first pair of the ball tracks (22A, 23A) and each second pair of the ball tracks (22B, 23B) are provided with torque-transmitting balls (14A, 14B). An annular ball cage (15) is disposed between the joint outer member (12) and the joint inner member (13) and has cage windows (18) distributed in the circumferential direction, wherein each cage window contains at least one torque-transmitting ball (14). Constant velocity joint.

15. The constant velocity joint according to claim 14, characterized in that the counter track joint (11) is designed for an operating bending angle of less than 25°.

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