Gear wheel

Abstract

In a gear wheel (1) having a gear wheel body (200) made of a first plastic material, the gear wheel body (200) is, - Rotation axis (R), - External gear device (210) positioned around a rotation axis, - A receiving opening (220) positioned in the center, and - having an intermediate section (225) positioned between the outer gear device (210) and the wall of the receiving opening (220), The gear wheel body (200) is fixedly formed on a support body (100) that is at least partially disposed in the intermediate section (225), and is made of a second plastic material having higher rigidity and lower elasticity than the first plastic material, so that the outer gear device (210), the wall (221) of the receiving opening (220), the intermediate section (225), and the surface section of the support body (100) form a substantially flat front face, The above support body (100) is provided with a reinforcing section (120) for the tooth (212) of the external tooth device (210), and The above external tooth device (210) is a helical tooth system having teeth (212) that extend at a helical angle (W) with respect to the rotation axis (R) at least section by section, and The present invention provides a gear wheel (1) characterized in that at least a portion of the reinforcing section (120) proceeds section by section at an angle (V) that corresponds at least approximately to the helical angle (W) of the helical gear.

Description

Technology Field

[0001] The present invention relates to a gear wheel made of plastic and having the features of the preamble of claim 1. Background Technology

[0002] Examples of integral gear wheels made of plastic are well known in DE 10 2017 201 383 A1, DE 202 22 502 U1, US2002 / 0029648 A1, and US 6,070,484. The gear wheel has an external tooth system arranged around a central axis of rotation. The gear wheel has a receiving opening in the middle for receiving an axis or shaft, and an intermediate section that integrally connects this receiving opening to the external tooth system. These known gear wheels have a so-called straight tooth system, that is, the teeth of the external tooth system are aligned parallel to the axis of rotation of the gear wheel. This type of straight tooth system has problems in terms of smooth operation and noise generation.

[0003] In addition, so-called multi-component gear wheels composed of different materials, for example, different plastics and parts, are also known.

[0004] This type of gear wheel is increasingly being used, particularly in applications for automotive auxiliary drives such as electric steering systems, electric seat adjustments, or electromechanical brakes. In these applications, it is important that these gear wheels meet high strength requirements while being compact and generating minimal noise during operation.

[0005] In general, within automotive structures, particularly in the implementation of electromechanical brakes, electric steering, and electric seat adjustment, there is a need to produce automotive parts that save weight and space by utilizing gear wheels that contribute to low noise generation. Furthermore, due to pressures from rising costs, there is a requirement to produce vehicle components as cheaply as possible.

[0006] Here, the present invention begins. The problem to be solved

[0007] The objective of the present invention is to provide a gear wheel made of the aforementioned plastic, particularly for use in auxiliary drive systems of automobiles, that can be produced inexpensively and occupies almost no space, while also meeting necessary requirements. Nevertheless, such a gear wheel must operate very smoothly and with low noise.

[0008] This objective is achieved by a gear wheel having the features of claim 1. Embodiments of such a gear wheel are the subject of dependent claims. means of solving the problem

[0009] The gear wheel according to the present invention comprises a gear wheel body made of a first plastic material, and the gear wheel body

[0010] - (Virtual) axis of rotation,

[0011] - External gear mechanism positioned around a rotation axis,

[0012] - Centered (i.e., concentric with respect to a virtual axis of rotation), particularly a cylindrical receiving opening, and

[0013] - It has an intermediate section disposed between the above-mentioned external gear device and the wall of the above-mentioned receiving opening.

[0014] For the sake of completeness, note that the aforementioned axis of rotation is a virtual axis used to define the geometric features of the gear wheel. Therefore, this is not a matter of a physically existing axis section placed on the gear wheel.

[0015] According to the present invention, the gear wheel body is fixedly formed on a support body that is at least partially disposed in the intermediate section and is made of a second plastic material having higher rigidity and lower elasticity than the first plastic material, so that the outer gear device, the wall of the receiving opening, the intermediate section, and the surface section of the support body form a substantially flat front face.

[0016] Here, the front surface of the gear wheel is perpendicular to the rotational axis of the gear wheel and is a surface that limits the gear wheel in one of two axial directions.

[0017] The term “substantially flat face” also includes front faces in addition to a flat face without a measurable height offset, in particular without a measurable height offset between surface sections of adjacent components of the gear wheel contributing to said face, wherein these surface sections are aligned exactly parallel to each other in the case where there is a slight height offset, in particular without the formation of a step not exceeding a height of about 1 mm, and / or adjacent surface sections are tilted slightly, for example, by 1 to 2. For example, 2K technology (2K-

[0018] In production using the technique, such deviations may occur because the second material added to the tool shrinks slightly. If steps are present, it is desirable that the "higher" region formed by these steps be composed of a plastic material or thermoplastic resin with optimized sliding properties, particularly polyoxymethylene (POM).

[0019] According to the present invention, the support body comprises a reinforcement section for the teeth of the external gear device.

[0020] A substantial advantage in terms of noise is achieved in that the external tooth device according to the present invention is a helical tooth system having teeth that extend at a helical angle with respect to the rotation axis at least section by section. To achieve the required strength for such an external tooth device in a small gear wheel, the present invention also provides that at least a portion of the reinforcing section proceeds at least section by section at an angle that corresponds at least approximately to the helical angle of the helical tooth device.

[0021] In particular, it is preferable that this section of the reinforcing section is the section closest to the teeth of the external gear device and, therefore, is the furthest from the axis of rotation of the gear wheel.

[0022] Particularly suitable second plastic materials are glass fiber, aramid fiber or carbon fiber reinforced plastic materials, glass ball or mineral-filled plastic materials, particularly polyphenylene sulfide (PPS) reinforced or filled in this way.

[0023] In addition, the first plastic material was proven to be a plastic material or thermoplastic resin having optimized sliding properties, in particular polyoxymethylene (POM).

[0024] Basically, it is possible to produce such a gear wheel such that the angle (V) at which at least a portion of these reinforcing sections is executed corresponds exactly or at least significantly accurately to the helical angle (W) of the outer gear, but in one embodiment of the present invention, the angle (V) is selected to be smaller than the helical angle (W). Here, the present invention particularly satisfies the following formula, or at least approximately the following formula

[0025] V = arctan ( tan (W) x (r) / (d0 / 2) )

[0026] Following,

[0027] Here, d0 / 2 = half the diameter of the partial circle of the outer gear, and

[0028] r = the distance from the axis of rotation (R) to the reference point of the reinforcement section.

[0029] Such a reference point may be placed particularly at the tip of the reinforcing section facing the external gear mechanism. In this case, r will be the radius of the head circle of the reinforcing section of the support body. An embodiment may be considered in which the reinforcing section is bent in such a way that the angle (V) at which the corresponding section of the reinforcing section proceeds is not constant but varies according to the distance from the axis of rotation of the gear wheel, particularly an embodiment according to the one mentioned above. Effects of the invention

[0030] For the implementation of the gear wheel according to the present invention, it has been proven appropriate that the helical angle (W) is greater than 0 degrees and less than 25 degrees, preferably approximately 10 to 20 degrees, particularly approximately 15 degrees.

[0031] A preferred support body comprises a ring-shaped support structure in which reinforcing sections are arranged, aligned perpendicularly to the rotation axis and to which each individual tooth of the gear wheel is assigned. An arrangement having multiple reinforcing sections extending at an angle (V) with respect to the central axis can be implemented particularly easily in this manner. Accordingly, in particular, the reinforcing sections do not extend precisely axially starting from the ring-shaped support structure but extend at the angle (V).

[0032] In the radial direction, the reinforcing section may extend in the direction of each tooth of the outer gear and may extend to or even protrude into the foot circle of the outer gear. In particular, the reinforcing section may protrude radially beyond the ring-shaped support structure at least section by section, so that when the support body is overmolded during the manufacture of the gear wheel, the reinforcing section is embedded in the gear wheel body and cannot escape from the gear wheel body.

[0033] When the above ring-shaped support structure has a first protrusion that protrudes radially toward each tooth of the above external gear device, the transmission of force through the ring-shaped support structure can be improved.

[0034] When the first protrusion of the support structure protruding radially to each tooth of the external gear device returns radially to the maximum extension of the reinforcing section and returns axially to the substantially flat front face of the reinforcing section, the reinforcing section is covered axially when overmolding the section of the gear body, thereby securing the support body so that it does not come loose.

[0035] The transmission of force through the support body is further improved when the ring-shaped support structure has a second protrusion that returns radially opposite to the wall of the receiving opening. Each of the first protrusion that protrudes radially onto each tooth of the external gear device and the second protrusion that returns radially opposite to the wall of the receiving opening are opposite at each position of the ring-shaped support structure (110).

[0036] It may be advantageous even if the area of ​​the reinforcing section facing the receiving opening, particularly the area of ​​the reinforcing section located below the second protrusion or protruding toward the receiving opening beyond the ring-shaped support structure, is parallel to the central axis rather than at an angle (V).

[0037] Additionally, it is preferable that the support body has openings extending through the ring-shaped support structure in a direction parallel to the axis of rotation and to the reinforcing section, respectively, and it is particularly preferable that at least some of these openings have an undercust.

[0038] The receiving opening of the gear wheel is provided with a structure suitable for receiving a hub, shaft, or spindle. If the receiving opening is to receive a spindle, the receiving opening is preferably provided with a spindle nut tooth device into which the spindle can be screw-coupled. Such a spindle can actuate the operating piston of an electric brake, for example, when the gear wheel, which is part of the gear mechanism of an electric brake, rotates.

[0039] In a specific embodiment of the present invention, the gear wheel is provided with an extension on one of its axial faces to accommodate radial and axial bearings, such as ball bearings. In this case, the extension may be formed as a circumferential ring having a plurality of uniformly divided and radially outwardly oriented ribs, and the outer diameter of the extension is smaller than the outer diameter of the outer gear. Here, the aforementioned ball bearing may slide over the ribs in a clamping manner, for example, if the ribs have an outer diameter selected to be somewhat larger than the receiving ring of the ball bearing.

[0040] When the above gear wheel is provided with an extension on the axial front side, it is recommended that a cylindrical concave recess be provided between the extension and the axial front side of the gear wheel. Such a cylindrical concave recess reduces the shear force when a load is applied to the gear wheel.

[0041] In another embodiment of the present invention, the front sides of the gear teeth facing radially outward when viewed from the axial direction of the gear wheel are formed in a step shape. Here, the outer tooth device may have one or more steps. This gradation of the outer front of the teeth, i.e., the tooth head of the teeth, increases the contact pattern of the gear wheel.

[0042] In another embodiment of the present invention, when viewed in the axial direction, the teeth of the outer tooth device have an edge-side tooth section that transitions from a helical tooth device having a helical angle (W) to a straight tooth device having a helical angle of 0 degrees. By using this method, the stress in the tooth foot of the outer tooth device can be distributed over a wider area. Brief explanation of the drawing

[0043] Hereinafter, the present invention will be described in more detail using embodiments and with reference to the attached drawings. FIG. 1 is a perspective view of a gear wheel according to the present invention having a specific application situation with a drive shaft and a spindle inserted into a gear wheel, FIG. 2 is a frontal oblique perspective view of the gear wheel of FIG. 1. FIG. 3 is an oblique perspective view of the gear wheel of FIG. 2 seen from the rear. FIG. 4 is a side view of the gear wheel of FIG. 1 to 3, FIG. 5 is a plan view of the rear of the gear wheel of FIG. 1 to FIG. 4 showing the injection point, FIG. 6 is a front oblique perspective view of a support body inserted into the gear wheel of FIGS. 1 to 5. FIG. 7 is an oblique perspective view of the support body of FIG. 6 seen from the rear. FIG. 8A is a front plan view of the gear wheel of FIG. 1 to FIG. 5 according to the first cutting line AA, FIG. 8B is a cross-sectional view along the first cutting line AA of FIG. 8A, FIG. 9A is a front plan view of the gear wheel of FIG. 1 to 5 according to the second cutting line AA, FIG. 9B is a cross-sectional view along the second cutting line AA of FIG. 9A, FIG. 10A is a front plan view of the gear wheel of FIG. 1 to 5 according to the third cutting line AA, and FIG. 10B is a cross-sectional view along the first cutting line AA of FIG. 10A. Specific details for implementing the invention

[0044] In the following drawings, the same reference numerals represent the same parts having the same meaning unless explicitly indicated otherwise. To enhance clarity in the drawings, not all reference numerals are shown in all drawings.

[0045] FIG. 1 illustrates a perspective view of a gear wheel (1) in an exemplary application, such as one that may be used in a brake actuator for a brake system of an automobile, for example. In the configuration of this application, the components with which the gear wheel (1) interacts are indicated by hatching. The side (2) of the gear wheel (1) facing the observer is hereinafter referred to as the foreside of the gear wheel (1), and the drawing showing this foreside is a front view. The side (3) of the gear wheel (1) opposite the side (2) is therefore referred to as the rear side, which can be seen from the rear of the gear wheel (1).

[0046] The gear wheel (1) comprises two plastic parts fixedly connected to each other by plastic injection molding, namely a gear wheel body (200) made of a first plastic material and a support body (100) made of a second plastic material having higher rigidity and lower elasticity than the first plastic material. The gear wheel body (200) is fixedly formed in a portion of the support body (100) by plastic injection molding. Further details regarding this are described below.

[0047] The gear wheel (1) has an external tooth system (210) having teeth (212) on the gear wheel body (200). The external tooth system (210) is a helical tooth system that runs along the teeth (212) and proceeds at least in sections along a portion of the external tooth system (210) of the gear wheel (1), as can be seen in the cross-sectional view of FIG. 9B along the cutting line AA shown in FIG. 4 and particularly FIG. 9A, that is, the position at the tooth section (212a) of the helix angle (W) with respect to the virtual axis of rotation (R) of the gear wheel (1) is illustrated as an example in FIG. 4, FIG. 5, FIG. 9A, and FIG. 9B. The helix angle (W) is greater than 0° and is about 15° in the illustrated exemplary embodiment. The spiral angle (W) may also be greater than about 0° and less than 25°, preferably about 10° to 20°.

[0048] These external gears (210) comb and engage with a worm (30), which is fixedly mounted on a shaft (20) that can be driven by, for example, a motor not shown in FIG. 1.

[0049] Inside the gear wheel body (200), particularly as can be clearly seen in FIG. 3, the rotation of the worm (30), the rotational motion therein can be converted into translational motion of the spindle (50) along the longitudinal axis (X). For example, the spindle can press a piston of a hydraulic circuit acting on a brake or brake piston.

[0050] For example, as can be clearly seen in FIG. 2 and especially in FIG. 3, the teeth (212) of the outer gear device (210) do not transition directly to the wall (221) of the receiving opening (220), so the gear wheel body (200) has an intermediate area (225), and in the intermediate area (225) sections of the support body (100) as seen particularly in FIG. 1 are arranged, and accordingly, the outer gear device (210), the wall (221) of the receiving opening (220), the intermediate section (225), and the surface section of the support body (100) form the front face of the gear wheel (1) which is as seen in FIG. 1 and is substantially flat, and the front face is also hereinafter characterized as the front face of the gear wheel (1).

[0051] The fact that this front surface is not perfect and is substantially flat is evident only when closely observing FIGS. 4, 8B, 9B, and 10B. The transition between the surface of the outer gear (210), on the one hand the wall (221) of the intermediate section (225) or the receiving opening (220), and on the other hand the support body (100) is not stepped, but the surface of the support body (100) has a minimum circumferential step of less than 1 mm in height, and the circumferential step causes a slight parallel offset of the front surface, but is so small that it does not significantly affect the space required for the gear wheel (1).

[0052] An extension (240) is present on the side (3) facing the front side, that is, on the rear side of the gear wheel (1), and in this application example, radial and axial bearings (60) in the form of ball bearings are accommodated.

[0053] As can be particularly clearly seen in FIG. 4, the extension (240) has a smaller diameter (D1) compared to the diameter (D2) of the outer gear (210). The extension is formed by a ring-shaped extension (242) of the wall (221) of the receiving opening (220). A rib (244) extends radially outward from the ring-shaped extension (242). The bearing (60) is preferably placed on this rib (244) in a clamping manner, and for this purpose, the outer dimension of the rib (244) is selected to be slightly larger than the inner diameter of the bearing, particularly the ball bearing.

[0054] Accordingly, the front face of the rear (3) of the gear wheel (1) is clearly not substantially flat, because this front face is formed by the front face of the extension (240) which is clearly spaced axially from the rear surface section of the outer gear device (210), the rear surface of the intermediate section (225), and the other component (3) of the front face of the rear (3) of the gear wheel.

[0055] In particular, as clearly illustrated in FIGS. 3 and 4, the radially outward front face of the tooth (212) of the outer tooth device (210) has a step (216) when viewed from the axial direction of the virtual center axis (R). As is particularly well known in FIG. 4, the step (216) also divides the tooth foot of the tooth (212) of the outer tooth device (210) into a relatively high stress area by defining the transition from the tooth section (212a) of the tooth (212) to the tooth section (212b) of the tooth (212) that forms a helical tooth device having an angle (W).

[0056] In particular, as can be clearly seen from FIG. 3 and FIG. 8B, a cylindrical concave recess (218) between the extension (240) and the second axial front (3) can be seen. This cylindrical concave recess (218) reduces the shear force when a load is applied to the gear wheel (1).

[0057] The structure of the support body (100) can be particularly well understood from FIGS. 6 and FIGS. 7. As can be derived from these figures, the support body (100) includes a ring-shaped support structure (110), and this ring-shaped support structure (110) is aligned perpendicular to the axis of rotation and a reinforcing section (120) is disposed for each tooth (212).

[0058] In particular, the reinforcing section (120) starts from the ring-shaped support structure (110) and extends at an angle (V) that is not exactly axial with respect to the central axis (R), that is, an angle (V) evident in the cross-sectional view shown in FIG. 10B along the cut line AA shown in FIG. 10A. In this embodiment, the angle (V) is smaller than the spiral angle (W), and the following formula

[0059] V = arctan (tan (W) x (r) / (d0 / 2))

[0060] Following,

[0061] Here, d0 / 2 = half the partial circle diameter of the outer gear device (210) and

[0062] r = distance from the rotation axis (R) to the reference point of the reinforcement section (120).

[0063] These reference points may be placed at the tip of the reinforcing section, particularly toward the teeth. In this case, r is the radius of the head circle of the reinforcing section of the support body. Radially, the reinforcing section (120) may extend toward each tooth (212) of the outer tooth device (210) and may extend to or even protrude toward the foot circle of the outer tooth device (210). In particular, the reinforcing section (120) may protrude radially beyond the ring-shaped support structure (110) at least section by section, as can be seen in the cross-sectional view shown in FIG. 8B according to the cut line AA shown in FIG. 6 and FIG. 8A. As can be seen in FIG. 8B, when the support body (100) is overmolded during the manufacture of the gear wheel, the reinforcing section (120) is embedded inside the gear wheel body (200) and cannot escape from the gear wheel body (200).

[0064] For example, as can be clearly seen in FIG. 6, the ring-shaped support structure (110) is provided with a first protrusion (111), and the first protrusion (111) protrudes radially onto each tooth (212) of the outer gear device (210). The first protrusion (111) of the ring-shaped support structure (110) is positioned radially inward with respect to the maximum size of the reinforcing section (120), while the reinforcing section (120) is positioned axially inward with respect to the front of the ring-shaped support structure (110), so that a part of the support body (100) covering the reinforcing section (120) axially is created due to overmolding, thereby preventing the gear wheel body (100) from coming out.

[0065] The transmission of force through the support body (100) is further improved by a second protrusion (112) provided in the ring-shaped support structure (110), the second protrusion (112) returns in the opposite direction to the radial direction on the wall of the receiving opening and is positioned opposite to the corresponding first protrusion (111) at each position of the ring-shaped support structure (110).

[0066] Additionally, the support body (100) has an opening (130) that extends into a reinforcing section (120) by passing through the ring-shaped support structure (110) in a direction parallel to the axis of rotation (R). This opening has an undercut (131).

[0067] Another feature of the design of the reinforcing section (120) can be seen from the perspective view selected in FIG. 7 and FIG. 8B. The gear-side flange (121) of the reinforcing section (120) is shorter than its own receiving-side flange (123), and the gear-side flange is connected to the front side (122) of each reinforcing section (120) by the concave front side (122). Due to this design, the longest possible section of the receiving portion (240) can be reinforced, and at the same time, the concave recess (218) can be provided within the gear wheel body (200).

[0068] These gear wheels (1) are manufactured as follows for convenience.

[0069] A step of injection molding the support body (100) with a second plastic material,

[0070] A step of forming the above support body (100) into a gear wheel body (200) made of a first plastic material having lower rigidity and higher elasticity than the second plastic material,

[0071] Here, the gear wheel body (200) is equipped with an outer gear device (210) for accommodating a spindle (50) and an inner spindle nut gear device (230), and

[0072] The above forming step is performed so that the outer gear device (210), the wall (221) of the receiving opening (220), the intermediate section (225), and the surface sections of the support body (100) form a substantially flat front of the gear wheel (1).

[0073] Here, the support body (100) can be prefabricated and inserted into an injection mold, and the injection molding of the gear wheel body occurs in a suitable mold. However, alternatively, a special tool may be provided according to the so-called 2K technique, in which, first, the support body (100) is plastic-injected, and then the gear wheel body (100) is injected into the support body (100) in the same tool. In both methods, the gear wheel body (200) has a plurality of injection points (270) as can be seen in FIGS. 3 and FIGS. 5. Explanation of the symbols

[0074] 1 gear wheel 2 (Front) Side 3 (Rear) Side 20 shafts 30 worms 50 spindles 60 Radial and Axial Bearings 100 support body 110 Ring-shaped support structure 111 First protrusion 112 Second protrusion 120 Reinforcement Section 121 Gear-side flange 122 Front view progressing in a concave direction 123 Receiving side flange 130 openings 131 Undercut 200 gear wheel body 210 External gear 212 gears 212a toothed section 212b toothed section 216 stairs 218 Omok Recess 220 receiving opening 221 Wall 225 Middle Section 230 Spindle Nut Gear 240 extension 242 Ring-shaped extension 244 Liv 270 injection points D1, D2 diameter R rotation axis V angle W spiral angle AA incision line

Claims

Claim 1 A gear wheel (1) having a gear wheel body (200) made of a first plastic material, wherein the gear wheel body (200) comprises: a rotation axis (R), an outer gear device (210) arranged around the rotation axis, a receiving opening (220) arranged in the center, and an intermediate section (225) arranged between the outer gear device (210) and the wall of the receiving opening (220); wherein the gear wheel body (200) is fixedly integrally formed with a support body (100) made of a second plastic material having higher rigidity and lower elasticity than the first plastic material and at least partially arranged in the intermediate section (225), so that the outer gear device (210), the wall (221) of the receiving opening (220), the intermediate section (225), and the surface section of the support body (100) form a substantially flat front face, and the support body (100) A gear wheel (1) characterized by having a reinforcing section (120) for a tooth (212) of the external tooth device (210), wherein the external tooth device (210) is a helical tooth system having a tooth (212) that extends at least section by section at a helical angle (W) with respect to the rotation axis (R), and at least a portion of the reinforcing section (120) extends at least section by section at an angle (V) corresponding to the helical angle (W) of the helical tooth device, and the relationship between the angle (V) and the helical angle (W) is given by the following formula: V = arctan (tan (W) x (r) / (d0 / 2)), where d0 / 2 = half the diameter of the portion of the external tooth device (210), and r = the distance from the rotation axis (R) to the reference point of the reinforcing section. Claim 2 A gear wheel (1) characterized in that, in claim 1, the second plastic material is a glass fiber, aramid fiber, or carbon fiber reinforced plastic material, or a glass ball or mineral-filled plastic material. Claim 3 A gear wheel (1) characterized in that, in claim 1 or 2, the first plastic material is a plastic material or thermoplastic resin having sliding properties. Claim 4 A gear wheel (1) characterized in that, in claim 1 or 2, the angle (V) is smaller than the spiral angle (W). Claim 5 delete Claim 6 A gear wheel (1) characterized in that, in claim 1 or 2, the support body (100) has a ring-shaped support structure (110) that is aligned perpendicularly to the rotation axis (R) and has the reinforcing section (120) disposed therein. Claim 7 In claim 6, the gear wheel (1) is characterized in that the ring-shaped support structure (110) has a first protrusion (111) that protrudes radially toward each tooth (212) of the outer gear device (210). Claim 8 In claim 7, the first protrusion (111) of the support structure (110), which protrudes radially toward the tooth (212) of the external gear device (210), is positioned radially inward with respect to the maximum range of the reinforcing section (120), characterized in that the gear wheel (1). Claim 9 In claim 6, the gear wheel (1) is characterized in that the reinforcing section (120) is positioned axially inward with respect to the flat front surface. Claim 10 In claim 6, the gear wheel (1) is characterized in that the ring-shaped support structure (110) has a second protrusion (112) positioned inwardly in a direction opposite to the radial direction toward the wall (221) of the receiving opening (220). Claim 11 In claim 10, the gear wheel (1) is characterized in that the first protrusion (111) protruding radially toward each tooth (212) of the external gear device (210) and the second protrusion (112) positioned inwardly in the opposite radial direction toward the wall (221) of the receiving opening (220) are arranged to face each other at corresponding positions of the ring-shaped support structure (110). Claim 12 In claim 6, the gear wheel (1) is characterized in that the support body (100) has an opening (130) that extends in a direction parallel to the axis of rotation through the ring-shaped support structure (110) to the reinforcing section (120). Claim 13 A gear wheel (1) characterized in that, in claim 12, at least a portion of the opening (130) has an undercut (131). Claim 14 A gear wheel (1) characterized in that, in claim 1 or 2, a spindle nut gear device (230) is disposed in the receiving opening (220). Claim 15 A gear wheel (1) characterized in that, in claim 1 or 2, the gear wheel body (200) has an extension (240) for accommodating radial and axial bearings (60) on the opposite side (3) of the front face formed by the cross-section of the gear wheel body (200) and the cross-section of the support body (100). Claim 16 In claim 15, the gear wheel (1) is characterized in that the extension portion (240) is formed as a circumferential ring (242) having a plurality of ribs (241) that are uniformly divided and radially outward, and the outer diameter (D2) of the extension portion (240) is smaller than the outer diameter (D1) of the outer gear device (210). Claim 17 A gear wheel (1) characterized in that, in item 15, a cylindrical concave recess (218) is provided between the extension portion (240) and the axial side (3) of the gear wheel (1) facing the extension portion (240). Claim 18 A gear wheel (1) characterized in that, in claim 1 or 2, the front side of the tooth (212) of the gear wheel (1) facing outward in the radial direction when viewed from the axial direction of the gear wheel (1) has at least one step (216). Claim 19 A gear wheel (1) characterized in that, in claim 1 or 2, the tooth (212) of the external tooth device (210) has an edge-side tooth section (212b) when viewed from the axial direction, and the tooth section (212b) is converted from a helical tooth device having a helical angle (W) to a straight tooth device having a helical angle 0°. Claim 20 A gear wheel (1) characterized in that, in claim 1 or 2, the spiral angle (W) is greater than 0° and less than 25°.

Images