Wheel bearing unit for a motor vehicle drive train

Abstract

The invention relates to a wheel bearing unit for a motor vehicle drive train, having a wheel bearing hub which has first spur toothing, and having a joint cap which has second spur toothing, the first spur toothing and the second spur toothing being coupled to one another for conjoint rotation and in each case having a plurality of teeth, the first spur toothing and / or the second spur toothing having at least one guide tooth which extends further in the axial direction than the other teeth.

Description

[0001]P231927 Wheel bearing unit for a motor vehicle drive train The invention relates to a wheel bearing unit for a motor vehicle drive train, with a wheel bearing hub having a first spur toothing, and a joint bell having a second spur toothing, wherein the first spur toothing and the second spur toothing are coupled to one another in a rotationally fixed manner and each has a plurality of teeth. Generic wheel bearing units are sufficiently known from the prior art. For example, the document DE 102021126242 discloses a spur toothing for a wheel bearing arrangement in which the tooth profile surface has been adapted. The document DE 102005009938 B4 likewise discloses a spur toothing for a wheel hub, wherein the geometry of the teeth is influenced via a flank angle. In all known spur gears, a first spur gear of a wheel hub engages with a second spur gear of a joint bell.When assembling both components together, it can happen that a so-called tooth-on-tooth position arises, in which the teeth of the first spur gear are on the teeth of the second spur gear. If the teeth of the first spur gear do not engage in the gaps between the teeth of the second spur gear (and vice versa), the transmission of high torques, which is intended to be guaranteed in particular by the use of the spur gear, cannot take place. It is therefore the object of the present invention to circumvent these problems and to create a spur gear in which a tooth-on-tooth position is effectively avoided. This object is achieved by a wheel bearing unit with the features of claim 1. Further advantageous embodiments emerge from the subclaims.P231927 The wheel bearing unit according to the invention for a motor vehicle drive train has a wheel bearing hub having a first spur toothing, and a joint bell having a second spur toothing, wherein the first spur toothing and the second spur toothing are coupled to one another in a rotationally fixed manner and each has a plurality of teeth. Furthermore, the first spur toothing and / or the second spur toothing has at least one guide tooth which extends longer in the axial direction than the other teeth. By integrating at least one guide tooth into the first and / or second spur toothing, it is ensured that, despite existing flattened areas on the teeth of the spur toothing, a secure engagement of the toothings is guaranteed, thus avoiding a tooth-on-tooth position.Said flattenings on the teeth are related to tolerances of the individual components and the manufacturing process and are difficult or costly to avoid. By providing at least one guide tooth, which ensures a well-formed tooth tip radius, a tooth-on-tooth position is avoided despite the flattenings on the other teeth. Preferably, the first spur gear and / or the second spur gear has a plurality of guide teeth. These can be distributed over the circumference. By providing a plurality of guide teeth, assembly can be further simplified and a tooth-on-tooth position can be effectively avoided. In an advantageous embodiment, the first spur gear and / or the second spur gear has an odd number of guide teeth. Particularly advantageously, the first spur gear and / or the second spur gear has at least three guide teeth.In a further embodiment, the first spur gearing and / or the second spur gearing has a plurality of guide teeth which extend at equal distances or angles to one another in the circumferential direction P231927. It has proven particularly advantageous if the guide teeth are arranged at an angle of 120° to one another. Further features of the invention will become apparent from the following description of the figures, in which exemplary embodiments of the invention are shown, although the invention is not limited to these exemplary embodiments. Therein: Fig. 1 shows a sectional view of a wheel hub and a joint bell with spur gearing Fig. 2 shows a plan view of a spur gearing Fig. 3 shows a three-dimensional view of a spur gearing of a wheel hub Figure 1 shows a sectional view of a wheel bearing unit 1, with a wheel hub 5 and a joint bell 6.The wheel hub 5 has a flange 5a extending in the radial direction, as well as an inner ring 5b pressed onto the wheel hub 5. The axial orientation of the inner ring 5a is ensured by a roller rivet collar 5c. The roller rivet collar 5c of the wheel hub 5 has a first spur gear 2. The first spur gear 2 has a plurality of teeth 4 extending in the radial direction R. The teeth 4 are formed by a tooth tip and two tooth flanks. Corresponding gaps are formed between the teeth, at the tooth root. The first spur gear 2 engages with a second spur gear 3 of the joint bell 6. The second spur gear 3 also consists of a plurality of radially aligned teeth 4 arranged in the circumferential direction, with gaps forming between the teeth 4. As can be seen in Figure 2, the first spur gear 2 and / or the second spur gear 3 has at least one guide tooth 7.The guide tooth 7 is P231927 extended in height, i.e., in the axial direction, compared to the other teeth 4 of the spur gearing. In particular, the guide tooth 7 is longer in its axial height over its entire length than the other teeth 4 of the spur gearing 2, 3. During assembly of the wheel hub 5 and joint bell 6, the guide teeth 7 of one spur gearing 2, 3 initially come into contact with the other teeth 4 or with the guide teeth 7 of the other spur gearing. This results in only partial contact between the guide teeth 7 of one spur gearing and the teeth of the other spur gearing 2, 3. By slightly rotating the two components relative to each other, the assembler can receive a haptic signal when the guide teeth of one spur gearing engage in the gaps between the teeth of the other gearing, achieving a tooth-in-tooth position.Particularly advantageously, the first and / or second spur gearing has a plurality of guide teeth 7. These can be distributed around the circumference at equal intervals or angles. In particular, an odd number of guide teeth is provided. Figure 3 shows a three-dimensional image of a section of a wheel hub 5. The first spur gearing 2 of the wheel hub 5 here has a guide tooth 7 that extends more extensively in the axial direction than the other teeth 4 of the gearing. P231927 Reference numeral 1 Wheel bearing unit 2 First spur gearing 3 Second spur gearing. 4 Zähne 5 Wheel bearing hub 5a Flange 5b Inner ring 5c ​​Rolling rivet collar 6 Joint bell 7 Guide tooth R Radial direction A Axial direction

Claims

P231927 Patent Claims 1. Wheel bearing unit (1) for a motor vehicle drive train, with a wheel bearing hub (5) having a first spur gear (2), and a joint bell (6) having a second spur gear (3), wherein the first spur gear (2) and the second spur gear (3) are coupled to one another in a rotationally fixed manner and each have a plurality of teeth (4), characterized in that the first spur gear (2) and / or the second spur gear (3) has at least one guide tooth (7) which extends longer in the axial direction (A) than the other teeth (4).

2. Wheel bearing unit (1) according to claim 1, characterized in that the first spur gear (2) and / or the second spur gear (3) has a plurality of guide teeth (7).

3. Wheel bearing unit (1) according to claim 1 or 2, characterized in that the first spur toothing (2) and / or the second spur toothing (3) has an odd number of guide teeth (7).4.Wheel bearing unit (1) according to one of claims 1 to 3, characterized in that the first spur gear (2) and / or the second spur gear (3) has at least three guide teeth (7).

5. Wheel bearing unit (1) according to one of claims 2 to 4, characterized in that the first spur gear (2) and / or the second spur gear (3) has a plurality of guide teeth (7) which extend at equal distances from one another in the circumferential direction.

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