Rack system for wheel bearing arrangement

Abstract

The invention relates to a system of straight toothing (1) for a wheel bearing arrangement, having a plurality of teeth (2) arranged on a positive side, extending radially and configured to axially engage into teeth of a counter toothing system, wherein each of the teeth (2) has a tooth flank (5) and a tooth tip (6) having a predefined tooth flank height (h5) and a predefined tooth tip height (h6) with respect to a tooth base plane (12), wherein the tooth flank (5) and the tooth tip (6) tangentially merge into one another, wherein the tooth tip (6) is configured by at least two radii (7, 8) which are substantially tangentially coupled to one another.

Description

Technical Field

[0001] This invention relates to spur gear systems for wheel bearing assemblies, and particularly to Hirth gear systems for driven wheel bearings. Background Technology

[0002] The use of spur gear systems as axially effective connections for rotating elements such as shafts is well known. For example, EP 2363 301 A1 discloses a spur gear system for a sprocket that extends circumferentially about a rotation axis on a wheel bearing assembly for a driveable hub, wherein the spur gear system is configured to engage without clearance in a mating gear system facing the spur gear system.

[0003] Furthermore, orthogonal gear systems can be manufactured through machining or forming processes. The assembly of orthogonal gear systems, particularly the engagement of two orthogonal gear systems, can become more difficult through known manufacturing processes.

[0004] It has now become clear that there is a need to further improve known orthodontic systems, and in particular, to provide orthodontic systems that simplify assembly.

[0005] The object of the present invention is to provide an improved orthogonal gear system for wheel bearing devices that simplifies assembly and, in particular, avoids tooth-to-tooth positioning during assembly and allows for improved tooth shaping. Summary of the Invention

[0006] These and other objectives, which are subsequently mentioned in the following description or may be recognized by those skilled in the art, are achieved through the subject matter of the independent claims. Advantageous embodiments and other improvements can be found in the dependent claims and the following description.

[0007] The spur gear system according to the invention, particularly the Hess gear system, for wheel bearing arrangements, especially for driven wheel bearings, has a plurality of teeth arranged on the spur gear flanks and extending radially, i.e., in the radial direction. Furthermore, these teeth are configured to engage axially, i.e., in the axial direction, with teeth of a mating gear system. Here, two adjacent teeth of the spur gear system form a backlash between them. Each of these teeth has a lateral tooth flank and a preferably generally central tooth tip, the tooth flank and tooth tip having a predetermined tooth flank height and a predetermined tooth tip height relative to the tooth base plane, wherein the tooth flank and tooth tip are tangentially merged into each other. The tooth tip is formed by at least two radii, preferably three radii, that are generally tangentially connected to each other.

[0008] The advantages of the solution according to the invention lie particularly in the fact that this tooth tip shape reduces the flow resistance of the material during the tooth formation process, and thus simplifies the forming of the tooth geometry, especially in the central portion of the tooth tip. Furthermore, the tooth tip is prevented from rising on the lateral surface and forming a platform or concave shape similar to a threaded tap.

[0009] The tooth base plane is a plane where the tooth width and the gap between teeth are of equal width. The end faces of the orthodontic system can be designed to be generally flat or slightly tapered.

[0010] Spur gear systems are specifically used in wheel bearing assemblies with driven wheel bearings, for example, for connecting wheel bearings to drive shafts or journals.

[0011] According to one embodiment, the tooth tip is formed by two lateral radii and a tip radius, wherein each of the two lateral radii and the tip radius is smaller than a single tangential connecting radius configured to form the tooth tip and tangentially merge into the tooth lateral surface. In this respect, the tip radius is arranged to be substantially centered between the two lateral radii, and each lateral radii tangentially merges into the tooth lateral surface.

[0012] A single tangential connection radius is a single radius that is tangentially merged into the tooth lateral surfaces on both sides and forms the tooth tip. Therefore, the connection radius can also be called the single tangential tooth tip radius.

[0013] The two flank radii and tip radii allow for more flexible and versatile shaping of the tooth tip. The radii can be arranged differently from each other, resulting in different tip heights for a given flank height and / or different tip heights for a given tip height, while a single tangential connection radius always results in a precisely paired, predefined flank height and a predefined tip height. Therefore, the geometry of the teeth in a spur tooth system can be adjusted according to the planned application. The flank radii are preferably identical to each other to obtain a symmetrical cross-sectional profile of the teeth in the spur tooth system.

[0014] According to one embodiment, the lateral radius and the tip radius are connected to each other substantially tangentially via a connecting geometry. Furthermore, the lateral radius is substantially tangentially incorporated into the tooth lateral surface. Both the lateral radius and the tip radius are smaller than a single tangential connecting radius. Specifically, the lateral radius may coincide with the tip radius. Alternatively, the lateral radius may differ from the tip radius. Depending on whether the tooth tip is more prominent or flatter, the tip radius may be arranged to be offset relative to the lateral radius towards the top, and closer to the tooth tip.

[0015] According to one embodiment, the connecting geometry is formed as connecting straight lines and / or connecting radii and / or connecting lines of free shape. According to one embodiment, the connecting straight lines are specifically formed as connecting tangents that tangentially connect the side radii and tip radii to each other.

[0016] The connection of radii formed approximately tangentially by the connecting geometry allows for the simple production of spur gear systems, particularly by means of a forming process. Furthermore, spur gear systems with a connecting geometry that connects the lateral radius and tip radius approximately tangentially to each other allow for simplified assembly. Alternatively, the connecting geometry can connect the lateral radius and tip radius to each other such that the transitions each form an edge. This means that the connecting geometry can also connect the lateral radius and tip radius non-tangentially to each other.

[0017] According to another embodiment, the tooth tip is formed by two lateral radii and a tip radius, wherein each of the two lateral radii is smaller than a single tangential connection radius, and the tip radius is larger than the single tangential connection radius, wherein the single tangential connection radius is configured to form the tooth tip and tangentially merge into the tooth lateral surface. This means that the single tangential connection radius describes a continuous radius that tangentially merges into the tooth lateral surface on both sides. The tip radius preferably extends such that it tangentially connects the two lateral radii to each other.

[0018] A single tangential connection radius is a single radius that is tangentially merged into the tooth lateral surfaces on both sides and forms the tooth tip. Therefore, the connection radius can also be called the single tangential tooth tip radius.

[0019] The two flank radii and tip radii allow for more flexible and versatile shaping of the tooth tip. The radii can be arranged differently from each other, resulting in different tip heights for a given flank height and / or different tip heights for a given tip height, while a single tangential connection radius always results in a precisely paired, predefined flank height and a predefined tip height. Therefore, the geometry of the teeth in a spur tooth system can be adjusted according to the planned application. The flank radii are preferably identical to each other to obtain a symmetrical cross-sectional profile of the teeth in the spur tooth system.

[0020] In one embodiment, the two lateral radii and the tip radius are connected to each other substantially tangentially. Specifically, the tip radius is designed to tangentially merge into the tooth lateral surface. In other words, the tip radius can be described as a curved connecting line designed to connect the two lateral radii substantially tangentially to each other. Depending on the size of the tip radius, the tooth tip may be flatter or more prominent.

[0021] The connection formed by the lateral radius through the approximate tangential direction of the tip radius allows for the simple production of orthogonal gear systems, particularly by means of a forming process, and simplifies assembly. Alternatively, the tip radius can also be incorporated into the lateral radius, thus forming an edge.

[0022] According to one embodiment, for a predetermined, approximately equal tooth flank height, the tooth tip height of a tooth having a tip portion formed by two tooth flank radii and a tip radius is smaller than the tooth tip height of a tooth having a tip portion formed by a single tangential connection radius. Due to the lower tip height, a lower degree of forming is required when producing the tooth shape using a forming process to manufacture the orthogonal tooth system. This reduces the flow resistance of the material required to form the tooth shape and improves tooth forming.

[0023] According to one embodiment, for a predefined, substantially equal tooth tip height, the tooth flank height of a tooth having a tip formed by two tooth surface radii and a tip radius is smaller than the tooth flank height of a tooth having a tip formed by a single tangential connection radius. The increased tooth flank height provides a larger contact area for axial engagement with the mating tooth system, thus allowing for improved torque transmission. Furthermore, this tooth shape improves ease of assembly. Both a more prominent tip design and a flatter tip design are possible.

[0024] According to one embodiment, when the tooth lateral surface height of a tooth having a tooth tip formed by two lateral radii and a tip radius is smaller or larger than the tooth lateral surface height of a tooth having a tooth tip formed by a single tangential connection radius, the tooth tip height formed by the two lateral radii and the tip radius is smaller than the tooth tip height formed by the single tangential connection radius.

[0025] A lower tooth tip height allows the tooth tip to be formed more directly or more flatly, meaning that a lower degree of forming is required to produce the tooth shape when manufacturing a spur tooth system using a forming process. This reduces the machining or forming forces required to form the tooth and thus simplifies tooth forming. Furthermore, the tooth flank height can be selected independently of the tooth tip height. This allows the tooth flank height to be individually adapted to the torque transmitted by the spur tooth system during operation.

[0026] In other words, the tooth tip, formed by several radii, allows the tooth tip height to be selected largely independently of the tooth flank height. This improves the adaptability of the orthodontic system to corresponding operating conditions and / or simplifies assembly. Attached Figure Description

[0027] Other improvements to the invention will be described in more detail below, together with the description of preferred exemplary embodiments of the invention, based on the accompanying drawings. In the drawings:

[0028] Figure 1 A schematic diagram of the orthogonal gear system is shown;

[0029] Figure 2 A schematic diagram showing the shape of the tooth tip of a tooth in an orthodontic system according to an embodiment of the present invention is provided.

[0030] Figure 3 A schematic diagram showing the shape of the tip of another tooth in an orthodontic system according to an embodiment of the present invention is provided;

[0031] Figure 4 A schematic diagram showing the shape of the tip of another tooth in an orthodontic system according to an embodiment of the present invention is provided; and

[0032] Figure 5 A schematic diagram showing the shape of the tip of another tooth in an orthodontic system according to one embodiment of the present invention is shown. Detailed Implementation

[0033] Figure 1 An exemplary schematic diagram of a spur gear system 1 is shown in perspective. The spur gear system 1 has a plurality of teeth 2, which are separated circumferentially by tooth gaps 3 and arranged on a surface, such as the end face of a shaft. The tooth profiles 4 of the teeth 2 are formed along an axial direction A, which in this case is the direction of the axis of rotation X. The direction of extension of the teeth 2 corresponds to the radial direction R.

[0034] Each tooth in tooth 2 has a tooth flank 5 and a tooth tip 6. The tooth flank 5 is formed on the lateral surface of tooth 2 and tangentially merged into the tooth tip 6, which forms the “tip” of tooth 2 approximately centrally and includes the highest point of tooth 2 as observed along the axial direction A.

[0035] The spur gear system 1, also known as the Hess gear system, is an axially effective gear that can be used in a form-fit connection as a rotating element, for example, to connect a driven wheel bearing to a drive shaft for torque transmission. For this purpose, the spur gear system 1 engages in a correspondingly designed mating gear system (not shown) along the axial direction A. In this connection, the teeth 2 rest and are flat against the teeth of the mating gear system.

[0036] Figures 2 to 5 A schematic diagram is shown of the tooth profile 4 of the tooth 2 of the orthodontic system 1 according to various embodiments of the present invention, which forms the tooth lateral surface 5 and the tooth tip 6. Here, the tooth tip 6 is formed by several radii, each of which is tangentially connected to and tangentially merged into the tooth lateral surface 5.

[0037] Figure 2A front view of the tooth profile 4 is shown to illustrate a possible tooth tip shape according to one embodiment of the invention, wherein the tooth tip 6 is formed by a total of three radii: two lateral radii 7 and a tip radius 8. Figure 2 In the tooth profile 4, the two lateral radii 7 and the tip radius 8 are equal in size, wherein the two lateral radii 7 are arranged to merge tangentially into the tooth lateral surfaces 5 on both sides of the tooth profile 4. When viewed along the axial direction A, the tip radius 8 is arranged to be higher than the lateral radii 7, and the lateral radii 7 and the tip radius 8 are tangentially connected by a connecting tangent 9 to form the tooth tip 6.

[0038] also, Figure 2 A single tangential connection radius 10 is shown in the tooth flanks 5' tangentially merged on both sides. The single tangential connection radius 10 describes the possibility of forming a shape with only one radius for the tooth tip 6'. Therefore, the single tangential connection radius can also be called the single tangential tooth tip radius 11. Both the flank radius 7 and the tip radius 8 are smaller than the single tangential connection radius 10.

[0039] It can be seen that when the tooth lateral surface height h5 of tooth 2 with tooth tip 6 is equal to the tooth lateral surface height h5' of tooth 2 with tooth tip 6', the tooth tip height h6 of tooth tip 6, formed by the two lateral surface radii 7 and tip radius 8 tangentially connected to each other by connecting tangent line 9, is smaller than the tooth tip height h6' of tooth tip 6', formed by a single tangential connecting radius 10. The tooth lateral surface heights h5, h5' and tooth tip heights h6, h6' are measured relative to the tooth base plane 12. The tooth base plane 12 corresponds to the plane containing tooth 2 and adjacent tooth gaps 3 of equal width.

[0040] Because the tooth tip height h6 is lower, the degree of forming required to produce the tooth tip 6 is lower than that required to produce the tooth tip 6'. Furthermore, the tooth tip 6 is more prominent than the tooth tip 6', which improves ease of assembly. The term "ease of assembly" refers to the assembly, i.e., connection, between the orthogonal tooth system 1 and the correspondingly designed mating tooth system. The more prominent shape of the tooth tip 6 reduces the risk of tooth-to-tooth misalignment during the assembly of the orthogonal tooth system 1 and the correspondingly designed mating tooth system.

[0041] Figure 3 A front view of the tooth profile 4 is shown to illustrate a possible tooth tip shape according to one embodiment of the invention, wherein the tooth tip 6 is formed by two side radius 7 and a tip radius 8, as shown. Figure 2 Same as in China. Figure 3 The implementation methods shown are the same as Figure 2 The implementations shown are essentially the same, so only the differences will be discussed below.

[0042] exist Figure 3In this design, the tooth tip height h6 of tooth 2 with tooth tip 6 is equal to the tooth tip height h6' of tooth 2 with tooth tip 6'. It can be seen that, for the same tooth tip height, the tooth lateral surface height h5 of tooth 2 with tooth tip 6 is larger than the tooth lateral surface height h5' of tooth 2 with tooth tip 6'. The increased tooth lateral surface height h5 provides a larger contact area for torque transmission when engaged with the correspondingly designed mating tooth system. This enables improved torque transmission during operation. Furthermore, tooth tip 6 protrudes more than tooth tip 6', which improves ease of assembly.

[0043] exist Figure 2 and Figure 3 In this configuration, the lateral radius 7 is equal in size to the tip radius 8. However, it is also possible that the lateral radius 7 and the tip radius 8 are different, wherein both the lateral radius 7 and the tip radius 8 are smaller than the single tangential connection radius 10. The two lateral radii 7 are preferably equal in size to obtain a generally symmetrical tooth profile 4.

[0044] Figure 4 A front view of the tooth profile 4 is shown to illustrate a possible tooth tip shape according to one embodiment of the invention, wherein the tooth tip 6 is formed by a total of three radii: two lateral radii 7 and a tip radius 8. Figure 4 In the tooth profile 4, the two lateral radii 7 are equal in size and are arranged to tangentially merge into the tooth lateral surfaces 5 on both sides of the tooth profile 4. The tip radius 8 is larger than the lateral radii 7 and is arranged such that when viewed along the axial direction A, the tip radius 8 is tangentially merged into the lateral radii 7 to form the tooth tip 6.

[0045] also, Figure 4 A single tangential connection radius 10 is shown in the tooth flanks 5' tangentially merged on both sides. According to... Figure 4 In the embodiment shown, the side radius 7 is smaller than the single tangential connection radius 10, while the tip radius 8 is larger than the single tangential connection radius 10.

[0046] It can be seen that when the tooth lateral surface height h5 of the tooth 2 with tooth tip 6 is equal to the tooth lateral surface height h5' of the tooth 2 with tooth tip 6', the tooth tip height h6 of the tooth tip 6 formed by the two lateral radii 7 and tip radius 8 tangentially merged into each other is smaller than the tooth tip height h6' of the tooth tip 6' formed by the single tangential connecting radius 10.

[0047] Because the tooth tip height h6 is lower, the degree of forming required to produce the shape of the tooth tip 6 is lower than that required to produce the shape of the tooth tip 6'. Furthermore, the lower tooth tip height h6 improves ease of assembly because the lower degree of forming significantly reduces or even completely eliminates the platform forming portion on the tooth tip 6. This reduces the risk of tooth-to-tooth misalignment during the assembly of the spur tooth system 1 with the correspondingly designed mating tooth system.

[0048] Figure 5 A front view of the tooth profile 4 is shown to illustrate a possible tooth tip shape according to one embodiment of the invention, wherein the tooth tip 6 is formed by two side radius 7 and a tip radius 8, as shown. Figure 4 Same as in China. Figure 5 The implementation methods shown are the same as Figure 4 The implementations shown are essentially the same, so only the differences will be discussed below.

[0049] exist Figure 5 In this configuration, the tooth tip height h6 of tooth 2 with tooth tip 6 is equal to the tooth tip height h6' of tooth 2 with tooth tip 6'. It can be seen that, for the same tooth tip height, the tooth flank height h5 of tooth 2 with tooth tip 6 is larger than the tooth flank height h5' of tooth 2 with tooth tip 6'. The increased tooth flank height h5 provides a larger contact area for torque transmission when engaged with the correspondingly designed mating tooth system. This enables improved torque transmission during operation. Furthermore, tooth tip 6 is formed to be flatter than tooth tip 6', thereby reducing the degree of forming required to produce the shape of tooth tip 6, which improves ease of assembly and / or reduces the risk of tooth-to-tooth misalignment during the assembly of the spur tooth system 1 with the correspondingly designed mating tooth system.

[0050] As can be seen from the summary of the accompanying drawings, compared to a single tangential connection radius, the tooth tip 6 formed by multiple radii offers significantly greater flexibility in the design of tooth flank height, tooth tip height, and / or tooth tip shape. This allows the orthogonal tooth system 1, and in particular the tooth 2, to be adapted to the corresponding requirements of the intended application.

[0051] List of reference numerals

[0052] 1 Orthodontic System

[0053] 2 teeth

[0054] 3. Tooth gap

[0055] 4. Tooth profile

[0056] 5, 5' tooth flanks

[0057] 6, 6' tooth tip

[0058] 7. Lateral radius

[0059] 8. Tip radius

[0060] 9 Connecting tangents

[0061] 10 Single tangential connection radius

[0062] 11 Single tangential tooth tip radius

[0063] 12 tooth base plane

[0064] Axial direction

[0065] R radial direction

[0066] X-axis of rotation

[0067] h5, h5' tooth flank height

[0068] h6, h6' Tooth tip height

Claims

1. A spur gear system (1) for a wheel bearing assembly, the spur gear system having: Multiple teeth (2), said teeth are arranged on the sides of the positive teeth, extend radially, and are configured to engage axially with the teeth of the mating tooth system. in, Each tooth in the tooth (2) has a tooth lateral surface (5) and a tooth tip (6), the tooth lateral surface and the tooth tip having a predetermined tooth lateral surface height (h5) and a predetermined tooth tip height (h6) relative to the tooth base plane (12), wherein the tooth lateral surface (5) and the tooth tip (6) are tangentially merged into each other. The tooth tip (6) is characterized in that it is formed by at least two radii (7, 8) that are substantially tangentially connected to each other, wherein the tooth tip (6) is formed by two side radii (7) and a tip radius (8), wherein each of the two side radii (7) and the tip radius (8) is smaller than a single tangential connection radius (10), the side radii (7) and the tip radius (8) are substantially tangentially connected to each other via a connection geometry, or, each of the two side radii (7) is smaller than a single tangential connection radius (10), the tip radius (8) is larger than the single tangential connection radius (10), the two side radii (7) and the tip radius (8) are tangentially merged into each other, the single tangential connection radius being configured to form the tooth tip (6') and tangentially merged into the tooth side surface (5') laterally.

2. The orthodontic system (1) according to claim 1, wherein, The connection geometry is formed as connecting straight lines and / or connecting radii and / or free-form connecting lines.

3. The orthodontic system (1) according to claim 2, wherein, The connecting straight line is formed as a connecting tangent (9), which tangentially connects the side radius (7) and the tip radius (8) to each other.

4. The orthodontic system (1) according to any one of claims 1 to 3, wherein, At a predetermined equal tooth lateral height (h5, h5'), the tooth tip height (h6) of the tooth (2) having a tooth tip (6) formed by the two said lateral radii (7) and the said tip radius (8) is smaller than the tooth tip height (h6') of the tooth (2) having a tooth tip (6') formed by the said single tangential connection radius (10).

5. The orthodontic system (1) according to any one of claims 1 to 3, wherein, At a predetermined equal tooth tip height (h6, h6'), the tooth lateral surface height (h5) of the tooth (2) having a tooth tip (6) formed by the two side radii (7) and the tip radius (8) is greater than the tooth lateral surface height (h5') of the tooth (2) having a tooth tip (6') formed by the single tangential connection radius (10).

6. The orthodontic system (1) according to any one of claims 1 to 3, wherein, When the tooth lateral surface height (h5) of the tooth (2) having a tooth tip portion (6) formed by the two side lateral radii (7) and the tip radius (8) is smaller or larger than the tooth lateral surface height (h5') of the tooth (2) having a tooth tip portion (6') formed by the single tangential connection radius (10), the tooth tip height (h6) of the tooth (2) having a tooth tip portion (6) formed by the two side lateral radii (7) and the tip radius (8) is smaller than the tooth tip height (h6') of the tooth (2) having a tooth tip portion (6') formed by the single tangential connection radius (10).

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