gear

Abstract

The invention relates to a metal gear (1) for meshing engagement with another gear (2) of a gear transmission (3) consisting of at least two meshing gears (1, 2), the gear comprising a gear body (4) having an outer circumferential surface (5) and two axial end faces (7, 8), wherein the gear body (4) has a toothing (6) with teeth (9) on its outer circumferential surface (5), and the teeth (9) have a tooth root (10) and extend over a tooth height (11), and a disk-shaped or annular reinforcing element (13) is arranged on the two axial end faces (7, 8), the reinforcing element extending in a radial direction at least to half the tooth height (11) and extending in a manner covering the tooth root (10).

Description

Technical Field

[0001] The present invention relates to a metal gear, which is used to mesh with another gear of a gear transmission device composed of at least two meshing gears. The metal gear includes a gear body, which has a circumferential surface and two axial end faces, wherein the gear body has a toothed portion with teeth on its outer circumferential surface, and the teeth have a tooth root and extend over the tooth height.

[0002] The present invention further relates to a split gear arrangement structure, which comprises a first sub-gear and a second sub-gear arranged beside the first sub-gear or on the first sub-gear.

[0003] Furthermore, the invention relates to a gear transmission comprising at least two gears meshing with one another. Background Art

[0004] Components produced by conventional smelting metallurgy are always replaced more often by components produced by powder metallurgy, especially because the latter can be produced more easily with respect to more complex geometries. However, due to production reasons, sintered components have a lower mechanical strength without additional treatment, which is also determined by the residual porosity of the sintered components. Therefore, in order to improve the mechanical load-bearing capacity, very different methods are described in the prior art in order to increase the load-bearing capacity, for example by surface compacting of the gear wheel by radial pressing or rolling. In addition, tooth flank treatment by surface hardening or surface compacting is known to increase the mechanical load-bearing capacity, or the intentional reduction of the hardness in the tooth root area in order to improve the mechanical properties. Summary of the invention

[0005] The object of the present invention is to improve the mechanical load-bearing capacity of a metallic gear wheel or a gear transmission equipped with such a gear wheel.

[0006] The object of the invention is achieved in the initially mentioned gear in that a disk-shaped or annular reinforcing element is provided on one of the two axial end faces, which extends in the radial direction at least to half the tooth height and covers the tooth base.

[0007] The object is also achieved with the initially mentioned split gear arrangement, wherein at least one of the two component gears is designed according to the invention.

[0008] Furthermore, the object of the invention is achieved with a gear transmission of the type mentioned at the outset, wherein at least one of the two intermeshing gears is designed according to the invention or is designed as a gear arrangement according to the invention.

[0009] It is advantageous here that a geometric change is achieved by means of lateral reinforcement elements, which can improve the tooth root strength, in particular reduce the tooth root stresses, by means of the additionally applied material. By means of the disk-like reinforcement elements arranged laterally on the toothing, the teeth of the toothing can be supported on the reinforcement elements during use. This results in a lower material load at the same torque. Surprisingly, the positive effect of the supporting geometry can have a stronger effect than an improvement by simply widening the toothing.

[0010] In order to further improve these effects, according to one embodiment variant of the toothed wheel, provision can be made for the reinforcing element to be arranged aligned with the tooth tips of the teeth.

[0011] In a preferred embodiment of the gear, the gear body is designed integrally with the toothing and with the reinforcing element as a sintered component. This not only achieves simple producibility, but also improves the introduction of force into the reinforcing element by means of the one-piece component.

[0012] The invention is preferably used in narrow gears, since here an improvement in the mechanical properties can only be produced with difficulty in other ways. For this reason, according to another embodiment of the invention, it can be provided that the toothing has an axial tooth width which is between 1 and 4 times the module of the toothing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to better understand the present invention, the present invention is explained in detail with reference to the following drawings.

[0014] In the simplified schematic diagram:

[0015] Figure 1 A variant embodiment of a gear is shown;

[0016] Figure 2 The split gear arrangement is shown in an oblique view;

[0017] Figure 3 The top view onto the toothed section shows the Figure 2 The split gear arrangement structure;

[0018] Figure 4 A variant embodiment of a split gear arrangement is shown;

[0019] Figure 5 The top view onto the toothed section shows the Figure 4 The split gear arrangement structure;

[0020] Figure 6 A variant embodiment of a gear transmission is shown;

[0021] Figure 7 The top view onto the toothed section shows the Figure 1 gear transmission. DETAILED DESCRIPTION

[0022] First of all, it should be pointed out that in the different described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosure contained in the entire description can be transferred to the same parts with the same reference numerals or the same component names. Selected positional descriptions in the description, such as top, bottom, lateral, etc., also refer to the directly described and shown figures and are transferred to the new positions in the case of a change in position.

[0023] exist Figure 1 1 is shown in FIG. The gear 1 is made of a metal material. The gear is configured to mesh with another gear 2 of a gear transmission 3 composed of at least two mutually meshing gears 1 and 2 ( Figure 2 ).

[0024] The gear 1 has a gear body 4. The gear body 4 has a radially outer peripheral surface 5, on which a toothed portion 6 is arranged or constructed. The gear body 4 is delimited by two axial end faces 7 and 8 in the axial direction (the second end face 8 can be viewed from the Figure 6 better seen).

[0025] The toothing 6 comprises or is formed by teeth 9. The teeth 9 have a tooth root 10, by which two teeth 9 arranged next to each other are connected to one another. The teeth 9 also have a tooth height 11 (viewed in the radial direction).

[0026] The toothing 6 is in particular designed as a spur toothing, but can also be a helical toothing (spur gear with oblique meshing).

[0027] The toothed body 4 also has a penetration 12 in the axial direction which is arranged concentrically with the gear body 4 and is used, for example, to receive a shaft or a hub.

[0028] In order to mechanically reinforce the toothing, it is merely provided that a reinforcing element 13 is provided on the axial end face 8. Figure 1 It can only be seen between the teeth 9. However, the reinforcing element is disk-shaped or annular, as can be seen from Figure 6 This can be seen better. In the case of a disk-shaped design, the reinforcing element 13 can cover the penetration 12 .

[0029] The reinforcing element extends to a radial height corresponding to at least half the tooth height 11. However, the reinforcing element can also extend further outwards and, if necessary, also protrude in the radial direction beyond the tooth 9. However, in a preferred embodiment variant of the gear 1, the reinforcing element 13 extends into the region of the tooth tip 14 of the tooth 9. The reinforcing element can be aligned in particular with the tooth tip 14, so that the reinforcing element 13 covers the tooth 9 over the entire tooth height 11 (viewed in the axial direction), but does not protrude beyond the tooth 9 in the radial direction.

[0030] The reinforcing element 13 extends radially inwardly at least to such an extent that it covers the tooth root 10 (again viewed in the axial direction) so that the tooth root 10 cannot be seen when viewed in the direction of the reinforcing element 13, as is the case in Figure 6 The right gear 1 is shown in FIG.

[0031] The reinforcing element 13 can be designed so as to start at the tooth root 10 and extend radially outwards. However, the reinforcing element can also extend to the beginning of the penetration 12, so that the reinforcing element 13 also partially or completely covers the end face 8 of the gear body 4, or the reinforcing element can (as already mentioned) be arranged so as to partially or completely cover the penetration 1.

[0032] The reinforcing element 13 may have a thickness 15 ( Figure 7 ), the thickness is selected from the range of 0.5 to 3 times the module of the tooth.

[0033] Within the scope of the invention, the module of the toothing can be, for example, between 1 mm and 3 mm.

[0034] The gear wheel 1 is preferably manufactured as a sintered component from a sintered metal powder, for example sintered steel, using a powder metallurgical method. According to a preferred embodiment variant of the gear wheel 1 , it can be provided that the gear wheel body 4 is formed integrally with the toothing 6 and with the reinforcing element 13 as a sintered component.

[0035] Since powder metallurgy methods are known per se, further details in this regard are omitted.

[0036] Preferably, the gear wheel 1 has only one reinforcing element 13. It is also preferred that the gear wheel 1 has a reinforcing element 13 only on one of its axial end faces 7, 8, as shown in the figures.

[0037] For the sake of completeness, it is pointed out here that the toothing 6 is not a toothing for engaging a toothed belt (or chain).

[0038] According to another embodiment variant of the gear 1, it can be provided that the toothing 6 has a tooth width 16 in the axial direction, which is between 1 and 4 times the module of the toothing. Figure 7 The gear 1 or the toothing 6 is relatively narrow.

[0039] Gear 1 can be used in different applications, such as Figures 2 to 7 To illustrate this, the figures show further and possibly independent embodiments of the invention, wherein the same components are again used as in the previous drawings. Figure 1 In order to avoid unnecessary repetition, the same reference numerals or component names are indicated or referenced to Figure 1 Detailed description.

[0040] The gear 1 can therefore be part of a split gear arrangement 17. Figure 2 and Figure 3 This split gear arrangement 17 serves to reduce the backlash when the teeth of the gear arrangement 17 engage in the teeth of another gear 2 which together with the split gear arrangement 17 forms the gear transmission 3 .

[0041] For this purpose, the split gear arrangement 17 has two sub-gears 18, 19. The sub-gear 19 is a fixed wheel and the second sub-gear 18 is a movable wheel, which can rotate in the circumferential direction relative to the fixed wheel. Here, the toothing 6 is divided on the two sub-gears 19. In this split gear arrangement 17, the movable wheel is formed by the previously described gear 1. Here, this gear 1 can also be arranged on the hub 20 of the fixed wheel. The gear is also preferably prestressed in the circumferential direction relative to the fixed wheel, in particular using at least one spring element, such as an omega spring 21.

[0042] Figure 4 and Figure 5 A further embodiment variant of a split gear wheel arrangement 17 is shown, which in turn is in meshing engagement with the further gear wheel 2 of the gear transmission 3 .

[0043] In this embodiment variant, the two gear parts 18, 19 are formed by the gear 1. This gear has its free end face 7 ( Figure 1 ) are (directly) in contact with each other at the dividing seam 22. The free end face 7 is the end face of the two axial end faces 7, 8 of the gear 1 which does not have the reinforcing element 13. Therefore, the reinforcing element 13 of the gear 1 is arranged on the outside in the split gear arrangement 17 of this embodiment variant and surrounds the toothing 6 between them, as can be seen from Figure 5 The split gear arrangement 17 has the same Figure 1 The axial length of the gear 1 is doubled.

[0044] The two gears 1 can be connected to each other, for example screwed or pinned. Figure 4 The connecting element 23 is shown in FIG.

[0045] However, the gear transmission 3 can also be implemented differently, such as Figure 6 and Figure 7 The gear transmission can again have two gears 1 according to the invention, but the gears are to be connected to each other according to Figures 2 to 5 The gear transmission devices 3 are distinguished and mesh with each other. Therefore, the gear 1 is Figure 6 and Figure 7 The arrangement shown in FIG. 1 is an arrangement of spur gears of equal size and opposite direction.

[0046] The exemplary embodiments show or describe possible embodiment variants of the invention, wherein it should be noted that combinations of the individual embodiment variants with one another are also possible.

[0047] Finally, it should be pointed out that, in order to provide a better understanding of the design of the gear 1 , the split gear arrangement 17 and the gear transmission 3 are not necessarily shown to scale.

[0048] Reference numerals list

[0049] 1 Gear

[0050] 2 Gear

[0051] 3 Gear transmission

[0052] 4 Gear body

[0053] 5 weeks

[0054] 6 teeth

[0055] 7 End face

[0056] 8 End face

[0057] 9 teeth

[0058] 10 tooth root

[0059] 11 teeth height

[0060] 12 penetration

[0061] 13 Enhancement elements

[0062] 14 tooth top

[0063] 15thickness

[0064] 16 tooth width

[0065] 17 Gear Arrangement

[0066] 18 gears

[0067] 19 gears

[0068] 20 hubs

[0069] 21 Omega Spring

[0070] 22 dividing seam

[0071] 23 Connecting elements

Claims

1. A metal gear (1) for meshing engagement with another gear (2) of a gear transmission (3) consisting of at least two mutually meshing gears, the gear comprising a gear body (4) having an outer circumferential surface (5) and two axial end faces (7, 8), wherein: The gear body (4) has a toothing (6) with teeth (9) on its outer circumferential surface (5), and the teeth (9) have tooth roots (10) and extend over a tooth height (11), characterized in that a disk-shaped or annular reinforcing element (13) is arranged on one of the two axial end faces (7, 8), the reinforcing element extending in a radial direction at least to half the tooth height (11) and extending in a manner covering the tooth root (10), the reinforcing element (13) being arranged aligned with the tooth tip (14) of the tooth (9), the gear body (4) being integrally constructed with the toothing (6) and the reinforcing element (13) as a sintered component, the reinforcing element (13) having a thickness (15) in the axial direction, the thickness being selected from a range of 0.5 to 3 times the module of the toothing (6), the toothing (6) having an axial tooth width (16), the tooth width being between 1 and 4 times the module of the toothing.

2. A split gear arrangement structure (17), comprising a first sub-gear (18) and a second sub-gear (19) arranged beside or on the first sub-gear, characterized in that: At least one of the first sub-gear (18) and the second sub-gear (19) is designed as a metallic gear wheel according to claim 1.

3. A gear transmission device (3), comprising at least two gears meshing with each other, characterized in that: At least one of the two intermeshing gears is designed as a metallic gear (1) according to claim 1 or as a split gear arrangement (17) according to claim 2.

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