Sequentially arranged planet gear

Abstract

The invention relates to a transmission arrangement (101, 201, 301, 401, 501), comprising a rotatable first planet carrier (107), a first planet gear (103) rotatably mounted in the first planet carrier (107), a second planet gear (105), a rotationally fixed ring gear (109) which meshes with a first toothing (103a) of the first planet gear (103), and a rotatable sun gear (117). The second toothing (103b) of the first planet gear (103) is rotationally connected to the sun gear (117) by means of the second planet gear (105).

Description

Technical Field

[0001] The invention relates to a transmission arrangement according to the preamble of claim 1 . Background Art

[0002] Such a transmission device is known from DE 10 2014 226 046 B4. This document discloses a planetary gear with a first toothing, a second toothing and a third toothing. The planetary gear is rotatably supported in a rotatable planet carrier. The first toothing meshes with a rotationally fixed ring gear, the second toothing meshes with a rotatable sun gear, and the third toothing meshes with a rotatable ring gear. Summary of the invention

[0003] The object of the present invention is to provide an improved transmission arrangement compared to the prior art. This object is achieved by a transmission arrangement according to claim 1. Preferred developments are contained in the dependent claims and are apparent from the following description.

[0004] Transmission equipment refers to equipment used in transmission equipment. Transmission equipment can refer to a part of the transmission equipment or the entire transmission equipment.

[0005] The transmission device arrangement according to the present invention is preferably arranged for a wind power plant. Therefore, the transmission device arrangement is preferably a wind power transmission device or a part thereof.

[0006] The transmission device according to the present invention comprises a first planet carrier, a first planet gear, a second planet gear, a first ring gear and a sun gear. The first planet carrier and the sun gear are rotatable. This means that the first planet carrier and the sun gear are supported in a manner that allows them to rotate relative to the housing of the transmission device. In particular, they can be supported in a rotatable manner in the housing or in a structure that is fixed relative to the housing.

[0007] The first toothed ring is rotationally fixed. This means that the first toothed ring is rotationally fixed relative to the housing of the transmission. Therefore, the toothed ring is rotationally fixed in the housing or in a structure fixed relative to the housing.

[0008] The first planet carrier, the first ring gear and the sun gear are arranged coaxially with each other. Therefore, the rotation axis of the first planet carrier is consistent with the rotation axis of the sun gear. These two rotation axes are also consistent with the central axis of the first ring gear.

[0009] The first planetary gear is rotatably supported in the first planetary carrier. The first planetary gear can rotate relative to the planetary carrier. The rotation axis of the first planetary gear extends spaced apart from the rotation axis of the planetary carrier. Preferably, the rotation axis of the first planetary gear and the rotation axis of the first planetary carrier extend parallel to each other. The rotation axis of the first planetary gear is immovable relative to the first planetary carrier. Therefore, when the first planetary carrier rotates, the rotation axis of the first planetary gear revolves around the rotation axis of the first planetary carrier.

[0010] The first planetary gear has a first toothing and a second toothing. The first toothing and the second toothing of the first planetary gear are implemented as external toothing. The first toothing and the second toothing are oriented coaxially with each other and cannot be rotated relative to each other. Preferably, the first toothing and the second toothing are connected to each other in one piece. In particular, the entire first planetary gear can be implemented in one piece.

[0011] The first ring gear or its toothing meshes with the first toothing of the first planetary gear. The toothing of the first ring gear is correspondingly designed as an internal toothing.

[0012] According to the invention, the second planetary gear forms a rotationally active connection between the second toothing of the first planetary gear and the sun gear. If a bijective relationship exists between a physical variable describing the rotation or pivoting of the first component and a physical variable describing the rotation or pivoting of the second component, the two components supported in a rotatable or pivotable manner are connected to each other in a rotationally active manner. In particular, a linear relationship may exist between the two variables. For example, the physical variable is a rotation angle, an angular velocity, a torque or a rotation acceleration.

[0013] Here, the second planetary gear represents a bijective relationship between the physical variable describing the rotation of the second toothing of the first planetary gear and the physical variable describing the rotation of the sun gear. Here, the rotation of the second toothing of the first planetary gear is transmitted to the sun gear via the second planetary gear, or in the opposite direction, the rotation of the sun gear is transmitted to the second toothing of the first planetary gear via the second planetary gear. Therefore, there is also a rotationally active connection between the second toothing of the first planetary gear and the second planetary gear, and between the second planetary gear and the sun gear. Therefore, there is a bijective relationship between the variable describing the rotation of the second toothing of the first planetary gear and the physical variable describing the rotation of the second planetary gear. There is another bijective relationship between the physical variable describing the rotation of the second planetary gear and the physical variable describing the rotation of the sun gear.

[0014] By inserting the second planetary gear in the rotationally active connection between the second toothing of the first planetary gear and the sun gear according to the invention, a higher transmission ratio can be achieved compared to a direct coupling of the second toothing of the first planetary gear and the sun gear. At the same time, the power loss is reduced, thereby improving the efficiency of the transmission device installation.

[0015] The first planet carrier can be connected to a shaft of the driving planet carrier or driven by the planet carrier in a rotationally fixed manner. In another preferred improvement, the drive is realized by the second ring gear. The second ring gear can rotate relative to the housing of the transmission. In particular, the second ring gear can be supported in a rotatable manner in the housing or in a structure fixed relative to the housing. Like the toothing of the first ring gear, the toothing of the second ring gear is also implemented as an internal toothing.

[0016] According to an improved solution, the first planetary gear has a third toothing portion implemented as an external toothing portion. The third toothing portion is coaxially arranged with the first toothing portion and the second toothing portion of the first planetary gear and cannot be rotated relative to the first toothing portion and the second toothing portion of the first planetary gear. In particular, the third toothing portion can be connected to the first toothing portion and the second toothing portion in one piece.

[0017] The toothed portion of the second gear ring meshes with the third toothed portion of the first planetary gear. Therefore, the driving torque can be applied to the first planet carrier via the second gear ring and the first planetary gear, or vice versa, the output torque can be applied to the second gear ring via the first planetary carrier and the first planetary gear.

[0018] The coupling of the first planet carrier to the second ring gear via the third toothing of the first planetary gear according to the development is advantageous because the transmission ratio can be further increased with lower power loss.

[0019] In a preferred development, the second toothing of the second planetary gear meshes directly with the sun gear or its toothing.

[0020] Similarly, in a preferred improvement, the second toothing of the first planetary gear meshes directly with the first toothing of the second planetary gear. This makes the structure of the transmission device particularly simple. This is particularly suitable in combination with the following improvement of the second toothing of the second planetary gear, that is, it meshes with the sun gear.

[0021] In an alternative preferred improvement, a rotatable intermediate wheel is provided. The intermediate wheel connects the second toothing of the first planetary wheel to the first toothing of the second planetary wheel in a rotational manner. This is represented by a bijective relationship between a physical variable describing the rotation of the second toothing of the first planetary wheel and a physical variable describing the rotation of the first toothing of the second planetary wheel. Here, the rotation of the second toothing of the first planetary wheel is transmitted to the first toothing of the second planetary wheel via the intermediate wheel, or in the opposite direction, the rotation of the first toothing of the second planetary wheel is transmitted to the second toothing of the first planetary wheel via the intermediate wheel.

[0022] The intermediate wheel is rotatable. This means that the intermediate wheel can rotate relative to the housing of the transmission. The intermediate wheel is coaxially arranged with the first planet carrier, the sun gear and the second ring gear. This means that the rotation axes of the first planet carrier, the sun gear and the second ring gear are consistent.

[0023] The intermediate wheel has a first toothing and a second toothing. They are arranged coaxially with each other and cannot rotate relative to each other. In particular, the first toothing and the second toothing of the intermediate wheel are connected to each other in one piece.

[0024] The first tooth section and the second tooth section can be internal tooth sections or external tooth sections, respectively. Thus, the first tooth section can be an external tooth section and the second tooth section can be an internal tooth section. Alternatively, the first tooth section is an internal tooth section and the second tooth section is an external tooth section. It is also possible that both tooth sections are implemented as external tooth sections or both tooth sections are implemented as internal tooth sections.

[0025] According to a further development, the second toothing of the first planetary gear meshes with the first toothing of the intermediate gear, wherein the second toothing of the intermediate gear meshes with the first toothing of the second planetary gear.

[0026] The intermediate gear can be used to decouple the first planetary gear from the second planetary gear in design. In particular, their tooth sizes are no longer directly dependent on each other. This provides additional design freedom. As a result, for example, the transmission device can be designed to be more compact and / or more efficient.

[0027] In a preferred development, the second planet gear is rotatably supported in the first planet carrier like the first planet gear. If there is no intermediate gear, the second planet gear needs to be supported in the first planet gear.

[0028] The intermediate wheel can realize a preferred improvement, which has a second planet carrier that can rotate relative to the first planet carrier. Preferably, the axis of rotation about which the first planet carrier and the second planet carrier can rotate relative to each other is the same as the axis of rotation of the first planet carrier, the sun gear and the second ring gear.

[0029] There are many possibilities for connecting the second planet carrier. In a preferred improvement, the second planet carrier can be connected to the second ring gear in a rotationally fixed manner.

[0030] In another alternative preferred improvement, the second planet carrier can be rotated relative to the second ring gear. In addition, the second planet carrier is also improved to be able to rotate relative to the sun gear and the intermediate gear. In such an improvement, the second planet carrier is, for example, configured to be rotationally fixed, that is, coupled to the housing of the transmission or a component fixed relative to the housing in a rotationally fixed manner. Alternatively, the second planet carrier can rotate relative to the housing and is coupled or can be coupled to a component outside the transmission device that is also rotatable relative to the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Preferred embodiments of the present invention are shown in the accompanying drawings. Identical reference numerals denote identical or functionally identical features. In the accompanying drawings:

[0032] Figure 1Shows a planetary gear;

[0033] Figure 2 Shows a planetary gear with a stepped idler gear;

[0034] Figure 3 Shows a planetary gear with a cylindrical idler gear;

[0035] Figure 4 Shows an alternative arrangement of the idler gear; and

[0036] Figure 5 shows a planetary gear. Detailed Description

[0037] Figure 1 The shown planetary gear 101 has a first planet gear 103 and a second planet gear 105. The first planet gear 103 is configured with three tooth portions (a first tooth portion 103a, a second tooth portion 103b, and a third tooth portion 103c). The second planet gear 105 is configured with two tooth portions (a first tooth portion 105a and a second tooth portion 105b).

[0038] The two planet gears 103 and 105 are rotatably supported in a single planet carrier 107. The planet carrier 107 is torsionally movable relative to the gear housing 109.

[0039] The third tooth portion 103c of the first planet gear 103 meshes with the tooth portion of the first ring gear 111. The first ring gear 111 is torsionally movable relative to the gear housing 109. The first ring gear is connected to the shaft by a cage 113 against relative rotation.

[0040] The tooth portion of the second ring gear 115 meshes with the first tooth portion 103a of the first planet gear 103. The second ring gear 115 is fixedly arranged relative to the housing, i.e., connected to the gear housing 109 against relative rotation.

[0041] The second tooth portion 103b of the first planet gear 103 meshes with the first tooth portion 105a of the second planet gear 105. The second tooth portion 105b of the second planet gear 105 in turn meshes with a sun gear 117 that is rotatable relative to the gear housing 109.

[0042] Figure 2 The planetary gears 201, 301, 401, 501 shown in FIGS. 5 to are different from Figure 1 the shown planetary gear 101 in terms of the idler gear 203. The idler gear 203 is rotatable relative to the gear housing 109. The idler gear has a first tooth portion 203a and a second tooth portion 203b. The first tooth portion 203a of the idler gear 203 meshes with the second tooth portion 103b of the first planet gear 103. The second tooth portion 203b of the idler gear 203 meshes with the first tooth portion 105a of the second planet gear 105.

[0043] The first planetary gear 103 and the second planetary gear 105 are each present in multiple embodiments. The embodiments of the first planetary gear 103 and the embodiments of the second planetary gear 105 are arranged rotationally symmetrically with respect to the common axis of rotation of the planet carrier 107, the second ring gear 111, the sun gear 117 and the intermediate gear 203. The second toothing 103b of multiple embodiments of the first planetary gear 103 meshes with the first toothing 203a of the intermediate gear 203. Similarly, the first toothing 105a of multiple embodiments of the second planetary gear 105 meshes with the second toothing 203b of the intermediate gear 203. Therefore, the intermediate gear 203 is supported by the second toothing 103b of multiple embodiments of the first planetary gear 103 and the first toothing 105a of multiple embodiments of the second planetary gear 105, so that no separate bearing device is required.

[0044] and Figure 1 The difference is, Figure 2 The second planetary gear 105 shown is not supported in the first planetary carrier 107, but in the second planetary carrier 205. The second planetary carrier 205 is connected to the cage 113 in a rotationally fixed manner.

[0045] Figure 2 The first tooth portion 203a and the second tooth portion 203b of the intermediate wheel 203 shown in the figure have different pitch circle diameters. The pitch circle diameter of the first tooth portion 203 is smaller than the pitch circle diameter of the second tooth portion 203b. This makes the intermediate wheel 203 step-shaped. The first tooth portion 203a is configured as an external tooth portion, and the second tooth portion 203b is configured as an internal tooth portion.

[0046] The difference is that Figure 3 The intermediate wheel 203 shown has the shape of a cylinder. The first toothing 203a and the second toothing 203b are designed as external toothings with the same pitch circle diameter.

[0047] Figure 4 The planetary transmission 401 shown is Figure 2 , Figure 3 The difference from the planetary gear 201 , 301 , 501 shown in FIG. 5 lies in the axial sequence of the toothings 103 a , 103 b , 103 c , 105 a , 105 b of the first planetary gear 103 and the second planetary gear 105 . Figure 2 , Figure 3The toothings 103a, 103b, 103c, 105a, 105b of the planetary transmissions 201, 301, 501 shown in FIG5 are arranged in the following axial order: the third toothing 103c of the first planetary gear 103, the first toothing 103a of the first planetary gear 103, the second toothing 103b of the first planetary gear 103, the first toothing 105a of the second planetary gear 105, and the second toothing 105b of the second planetary gear 105. Figure 4 The tooth portions 103a, 103b, 103c, 105a, 105b of the first planetary gear 103 and the second planetary gear 105 of the planetary transmission 401 shown are arranged in the following axial sequence: the second tooth portion 103b of the first planetary gear 103, the first tooth portion 105a of the second planetary gear 105, the second tooth portion 105b of the second planetary gear 105, the third tooth portion 103c of the first planetary gear 103, and the first tooth portion 103a of the first planetary gear 103. This has the advantage that the connection between the second planet carrier 205 and the retaining frame 113 is shorter.

[0048] The planetary transmission device 501 shown in FIG. Figure 2 The planetary transmission 201 shown differs in the connection of the second planet carrier 205. The second planet carrier 205 according to FIG. 5 is not connected to the retaining frame 113, but extends to the axially opposite side. This makes it possible to connect the second planet carrier 205 to the transmission housing 109 in a substantially rotationally fixed manner. It is also possible to fix the sun gear 117 to the transmission housing 109 in a rotationally fixed manner, and instead connect the second planet carrier 205 to the shaft for transmitting the torque flow. It is also possible to design both the second planet carrier 205 and the sun gear 117 to be rotatable relative to the transmission housing 109, so that the power transmitted by the planetary transmission 501 is branched to these two components 205, 117.

[0049] Reference numerals list

[0050] 101 Planetary gear

[0051] 103 Planetary gear

[0052] 103a Tooth

[0053] 103b Tooth

[0054] 103c Tooth

[0055] 105 Planetary gear

[0056] 105a Tooth

[0057] 105b Tooth

[0058] 107 Planet carrier

[0059] 109 Transmission housing

[0060] 111 Ring gear

[0061] 113 Cage

[0062] 115 Ring gear

[0063] 117 Sun gear

[0064] 201 Planetary gear

[0065] 203 Intermediate wheel

[0066] 203a Tooth

[0067] 203b Tooth

[0068] 205 Planetary carrier

[0069] 301 Planetary gear

[0070] 401 Planetary Transmission

[0071] 501 Planetary gear

Claims

1. A transmission device arrangement (101, 201, 301, 401, 501), the transmission device arrangement comprising a rotatable first planet carrier (107), a first planet gear (103) rotatably supported in the first planet carrier (107), a second planet gear (105), a rotationally fixed ring gear (109) meshing with a first toothed section (103a) of the first planet gear (103), and a rotatable sun gear (117); It is characterized in that The second tooth portion (103b) of the first planetary gear (103) is connected to the sun gear (117) in a rotational manner via the second planetary gear (105).

2. The transmission device facility (101, 201, 301, 401, 501) according to claim 1; Features A rotatable ring gear (111) is provided, wherein the ring gear is meshed with the third tooth portion (103c) of the first planetary gear (103).

3. The transmission device arrangement (101, 201, 301, 401, 501) according to any one of the preceding claims; It is characterized in that The second tooth portion (105b) of the second planetary gear (105) meshes with the sun gear (117).

4. The transmission device arrangement (101) according to any one of the preceding claims; It is characterized in that The second tooth portion (103b) of the first planetary gear (103) meshes with the first tooth portion (105a) of the second planetary gear (105).

5. The transmission device arrangement (101) according to any one of the preceding claims; It is characterized in that The second planet gear (105) is rotatably supported in the first planet carrier (107).

6. The transmission device facility (201, 301, 401, 501) according to any one of claims 1 to 3; Features A rotatable intermediate wheel (203) is provided; wherein, The second tooth portion (103b) of the first planetary wheel (103) meshes with the first tooth portion (203a) of the intermediate wheel (203); and wherein: The second tooth portion (203b) of the intermediate wheel (203) meshes with the first tooth portion (105a) of the second planetary wheel (105).

7. The transmission device facility (201, 301, 401, 501) according to any one of claims 1 to 3 or claim 6; Features A second planet carrier (205) is provided which is rotatable relative to the first planet carrier (107), and the second planet gear (105) is rotatably supported in the second planet carrier.

8. Transmission device arrangement (201, 301, 401) according to the preceding claim; It is characterized in that The second planet carrier (205) is connected to the rotatable ring gear (111) in a rotationally fixed manner.

9. The transmission device facility (501) according to claim 7; It is characterized in that The second planet carrier (205) is rotatable relative to the rotatable ring gear (111), the sun gear (117) and the intermediate gear (203).

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