Tapered connection of sun shaft and planet carrier
By interlocking the outer and inner cones and combining them with a clamping mechanism, the problems of insufficient robustness and high cost of planetary connections in wind turbine transmission devices are solved, achieving a more stable and economical transmission connection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHAFA FRIEDRICH SCHAFFEN CO LTD
- Filing Date
- 2024-09-10
- Publication Date
- 2026-05-12
AI Technical Summary
In existing wind turbine transmission systems, the connections between planetary segments are not robust enough and have high manufacturing costs.
The outer and inner vertebral bodies are connected by an interlocking method. The outer and inner vertebral bodies form an axial support through a tapering design. Combined with a clamping mechanism, a force-locking and/or shape-locking anti-relative rotation connection is achieved, which optimizes the transmission connection between planetary-level stars.
It improves the robustness of the transmission and reduces manufacturing costs, while being suitable for wind turbine transmissions. In particular, the wind-directional tapering design enhances the stability and durability of the connection.
Smart Images
Figure CN122029370A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a transmission device assembly according to the preamble of claim 1. Background Technology
[0002] Wind turbine drive systems with multiple planetary planets connected sequentially are commercially available. The planet carrier of the downstream planetary planet is connected to the sun axis of the upstream planetary planet via splined teeth to prevent relative rotation. Summary of the Invention
[0003] The objective of this invention is to provide an improved transmission assembly. This objective is achieved by the transmission assembly according to claim 1. Preferred improvements are contained in the dependent claims and will become apparent from the following description and drawings.
[0004] The transmission assembly according to the invention includes a first planetary stage and a second planetary stage. The planetary stage is a transmission stage having a ring gear, a planet carrier, planet gears, a sun gear, and a sun shaft. The planet gears are rotatably supported in the planet carrier and mesh with the ring gear and / or the sun gear, respectively. The sun gear is connected to the sun shaft in a rotationally resistant manner. Preferably, the ring gear is fixed relative to the housing, i.e., connected to the transmission housing or a structure fixed relative to the housing in a rotationally resistant manner, while the planet carrier and sun gear can rotate relative to the transmission housing using the sun shaft.
[0005] According to the present invention, the sun axis of the first planetary system has an outer cone, and the planet carrier of the second planetary system has an inner cone.
[0006] The outer vertebral body is a structure having the shape of a truncated cone or a hollow truncated cone. Correspondingly, the inner vertebral body is a structure having a hollow space in the shape of a truncated cone. It is the negative shape of the outer vertebral body.
[0007] Currently, the lateral and lateral vertebral bodies are interlocked. Therefore, the lateral vertebral body is at least partially located inside the lateral vertebral body, that is, inside the hollow space of the lateral vertebral body.
[0008] Currently, there is a force-locking and / or form-locking anti-rotational connection between the outer and inner vertebrae. This connection allows the sun gear of the first planetary system to be connected to the planet carrier of the second planetary system in an anti-rotational manner. Compared to solutions known from the prior art, this connection has advantages because it is robust and can be manufactured simply and inexpensively.
[0009] The transmission assembly according to the invention is particularly suitable for wind turbine transmissions. Preferably, the torque flow from the wind turbine rotor to the generator extends through a first planetary gear series to a second planetary gear series. Specifically, the torque flow is introduced from the sun gear and sun shaft of the first planetary gear series into the planet carrier of the second planetary gear series via a tapered connection.
[0010] In a preferred embodiment, the outer and inner cones taper from the first planetary plane towards the second planetary plane. This corresponds to a taper along the direction of the torque flow described above. Specifically, the taper begins from the mid-plane of the first planetary plane, i.e., the cross-sectional plane that intersects the engagement portion of the first planetary plane in the middle, and tapers towards the mid-plane of the second planetary plane, i.e., the cross-sectional plane that intersects the engagement portion of the second planetary plane in the middle. In a wind turbine, this corresponds to the wind direction. Then, the outer and inner cones taper along the wind direction.
[0011] Gradual reduction refers to the degree of decrease in the area of the cross-section. Therefore, according to the improved scheme, the area of the outer vertebral body and the area of the hollow space of the inner vertebral body decrease from the first planetary level towards the second planetary level.
[0012] By employing a tapered design based on the improved scheme, an axial force can be applied to the connection between the outer and inner vertebrae, resisting the movement of the sun gear and sun axis of the first planetary planet towards the second planetary planet. Therefore, the planet carrier of the second planetary planet, or the connection between the outer and inner vertebrae, forms an axial support in which the sun gear and sun axis of the first planetary planet can be supported.
[0013] In helical gear meshing, an axial force is generated, which must be intercepted by an axial support. The aforementioned tapering design of the outer and inner vertebrae thus enables the first planetary segment to adopt an helical gear meshing method for improvement.
[0014] In a preferred improvement, the force-locking connection between the outer and inner vertebral bodies is achieved through an interference fit.
[0015] For this purpose, a clamping mechanism can be used. In a preferred embodiment, the clamping mechanism tensions the outer and inner vertebral bodies axially relative to each other. Specifically, the clamping mechanism applies an axial force to the outer and inner vertebral bodies that results in tension. Here, the outer vertebral body is tensioned toward the inner vertebral body, and conversely, the inner vertebral body is tensioned toward the outer vertebral body.
[0016] Alternatively, the component can be extended and improved, for example, by a clamping mechanism that tensions the outer and inner vertebrae radially relative to each other. This clamping mechanism generates a radially oriented clamping force. The clamping mechanism can be externally fitted onto the inner vertebrae, causing radial inward deformation of the inner vertebrae through the clamping force. Alternatively, the clamping mechanism is located inside the outer vertebrae, or within a hollow space surrounded by the outer vertebrae. This induces radial outward deformation of the outer vertebrae. Due to the deformation of either the inner or outer vertebrae, a force-locking relationship is formed between the inner and outer vertebrae.
[0017] In a preferred embodiment, the outer and inner vertebral bodies are circular in at least one cross-section. A circular cross-section is advantageous under potential overload conditions because the connection between the outer and inner vertebral bodies can slip without damage.
[0018] In an alternative preferred improvement, the outer and inner vertebral bodies are non-circular in at least one cross-section. Due to the non-circular cross-section, a form-locking, anti-rotational connection is formed between the outer and inner vertebral bodies. The form-locking connection prevents slippage. This is advantageous if higher loads, which could cause slippage even during normal operation, are required.
[0019] The outer and inner vertebrae can have, for example, a polygonal shape in at least one cross-section. A spline-shaped cross-sectional surface is also possible. In this case, the edges of the cross-sectional surface consist of one or more spline profile segments.
[0020] Preferably, the component is extended and improved using a third planetary star system. According to the improved design, the connection between the second and third planetary star systems is similar to the design of the connection between the first and second planetary star systems described above. Therefore, according to the improved design, the sun axis of the second planetary star system has an outer cone, and the planet carrier of the third planetary star system has an inner cone. The outer and inner cones interlock and form a force-locked and / or form-locked anti-rotational connection.
[0021] Preferably, the connection between the outer cone of the second-planetary solar axis and the inner cone of the third-planetary planetary carrier is improved to resemble the connection between the outer cone of the first-planetary solar axis and the inner cone of the second-planetary planetary carrier. Therefore, the statements above relating to the outer cone of the first-planetary solar axis and the inner cone of the second-planetary planetary carrier, with necessary modifications, apply to both the outer cone of the second-planetary solar axis and the inner cone of the third-planetary planetary carrier. Attached Figure Description
[0022] Preferred embodiments of the present invention are as follows: Figure 1 As shown in the image. In detail: Figure 1 The transmission mechanism of a wind turbine is shown. Detailed Implementation
[0023] exist Figure 1 The transmission device shown includes a first planetary axis 101, a second planetary axis 103, and a third planetary axis 105. The sun axis 107 of the first planetary axis 103 is connected to the planet carrier 109 of the second planetary axis 103 in a rotationally resistant manner. Similarly, the sun axis 111 of the second planetary axis 103 is connected to the planet carrier 113 of the third planetary axis 105 in a rotationally resistant manner.
[0024] The sun axis 107 of the first star system 101 has an outer vertebral body 115. Similarly, the sun axis 111 of the second star system 103 has an outer vertebral body 117.
[0025] The outer cone 115 of the sun axis 107 of the first planetary star system 101 is embedded in the inner cone 119 formed by the planet carrier 109 of the second planetary star system 103. The sun axis 107 of the first planetary star system 103 is designed as a hollow shaft. A clamping mechanism 121 is present inside this hollow shaft. The clamping mechanism tensions the outer cone 115 of the sun axis 107 of the first planetary star system 101 in the radial direction. As a result, the outer cone 119 expands and is itself tensioned to the inner cone 119 of the planet carrier 109 of the second planetary star system 103. Therefore, a force-locked, anti-rotational connection is formed between the outer cone 115 of the sun axis 107 of the first planetary star system 101 and the inner cone 119 of the second planet carrier 109 of the second planetary star system 103.
[0026] The sun axis 111 of the second planetary star 103 is also implemented as a hollow shaft. Inside this hollow shaft is a second clamping mechanism 125. This second clamping mechanism tensions the outer cone 119 of the sun axis 111 of the second planetary star 103 in the radial direction. This causes the outer cone 119 to expand and tension the inner cone 125 of the planet carrier 113 of the third planetary star 105. Thus, a force-locked, anti-rotational connection is created between the outer cone 119 of the sun axis 111 of the second planetary star 103 and the inner cone 125 of the planet carrier 113 of the third planetary star 105.
[0027] List of reference numerals
[0028] 101 Planetary level
[0029] 103 Planetary level
[0030] 105 planetary level
[0031] 107 Sun Axis
[0032] Planetary Carrier 109
[0033] 111 Sun Axis
[0034] 113 Planetary Carrier
[0035] 115 outer vertebral body
[0036] 117 outer vertebral body
[0037] 119 inner vertebral body
[0038] 121 Clamping mechanism
[0039] 123 Clamping mechanism
[0040] 125 Internal vertebral body
Claims
1. A transmission device assembly having a first row of stars (101) and a second row of stars (103), characterized in that, The solar axis (107) of the first planetary ... The outer vertebral body (115) and the inner vertebral body (119) interlock, and wherein, There is a force-locking and / or shape-locking anti-relative rotational connection between the outer vertebral body (115) and the inner vertebral body (119).
2. The component according to claim 1, characterized in that, The outer vertebral body (115) and the inner vertebral body (119) gradually taper from the first planetary level (101) toward the second planetary level (103).
3. The component according to any one of the preceding claims, characterized in that, The first planetary gear (101) is helical gear meshing.
4. The component according to any one of the preceding claims, characterized in that... There is an interference fit between the outer vertebral body (115) and the inner vertebral body (119).
5. The component according to any one of the preceding claims, characterized in that... It has a clamping mechanism that tensions the outer vertebra (115) and the inner vertebra (119) axially relative to each other.
6. The component according to claim 4, characterized in that It has a clamping mechanism (121) which is at least partially disposed inside the outer vertebra (115) and tensions the outer vertebra (115) radially relative to the inner vertebra (119).
7. The component according to any one of the preceding claims, characterized in that, The outer vertebra (115) and the inner vertebra (119) are circular in at least one cross-section.
8. The component according to any one of claims 1 to 6, characterized in that, The outer vertebra (115) and the inner vertebra (119) are non-circular in at least one cross-section.
9. The component according to any one of the preceding claims, characterized in that... It has a third row of stars (105), among which, The second planetary planet (103) has an outer cone (117) on its solar axis (111), and the third planetary planet (105) has an inner cone (119) on its planetary carrier (113), wherein, The outer cone (117) of the solar axis of the second planetary star (103) and the inner cone (119) of the planetary carrier of the third planetary star (103) are interlocked and form a force-locked and / or form-locked anti-rotational connection.