Synchronized auxiliary drive

Abstract

Arrangement comprising a wind turbine gearbox (101), an actuator, a first shaft (123) and a second wave (127); where the first shaft (123) is necessarily coupled to a rotor of the actuator; and wherein the second shaft (127) is necessarily coupled to at least one gear element (121) of the transmission (101); characterized by a synchronizing device (125); wherein the synchronizing device (125) is designed to connect the first shaft (123) and the second shaft (127) in a rotationally fixed and detachable manner.

Description

[0001] The invention relates to an arrangement according to the preamble of claim 1.

[0002] Larger wind turbines are equipped with a rotor actuator. This device moves the turbine's drive train into a defined position for assembly and maintenance work. The rotor actuator acts on the turbine's gearbox, driving a gear that engages with a gear in the gearbox. The drive train must be stationary to engage the gears. However, operator errors occasionally occur. For example, the rotor actuator might be engaged while the wind turbine is running. Due to the differing peripheral speeds of the gears, this can lead to damage.

[0003] EP 2 116 722 B1 discloses a wind turbine with a rotor which is operatively connected to a gearbox via a rotor shaft, wherein the gearbox is operatively connected to a generator via a main drive. The gearbox has an auxiliary drive and a rotor positioning rotary device can be arranged or is arranged on the auxiliary drive, such that the rotor can be positioned using the rotor positioning rotary device and the auxiliary drive.

[0004] From DE 10 2008 038 128 A1, an adjustment device for adjusting the rotational angular position of the rotor of a wind turbine is known. The adjustment device comprises at least one force-receiving wheel or such a force-receiving disc, designed as an independent component and mounted or mountable on a shaft of the drive train downstream of the rotor, structured for the engagement of a force transmission means, a drive means for generating a drive force, and at least one force transmission means for transmitting the drive force to the force-receiving wheel or the force-receiving disc.

[0005] The invention is based on the objective of avoiding the inherent disadvantages known from the prior art. In particular, it aims to engage gears rotating at different circumferential speeds without damaging the teeth.

[0006] This problem is solved by an arrangement according to claim 1. Preferred embodiments are included in the dependent claims.

[0007] The arrangement comprises a gearbox, an actuator, and at least one first shaft. The gearbox is preferably a gearbox, for example, for transmitting a power of up to 2 MW, 3 MW, 5 MW, or 8 MW, of a wind turbine, wherein the wind turbine has a rotor actuator that functions as the aforementioned actuator.

[0008] The actuator comprises a rotor that is rotatable relative to a stator and is driven. The first shaft is necessarily coupled to the rotor. A necessarily coupled connection is defined as a coupling with a gear degree of freedom of 1. A general definition of the term gear degree of freedom, also called gear degree of rotation, can be found in "Dubbel" (Karl-Heinrich Grote, Jörg Feldhusen: "Dubbel". 2nd edition, 2007). The gear degree of freedom corresponds to the number of relative movements that must be specified so that the movements of all links in the gear unit are completely fixed. This corresponds to the number of relative movements that must be prevented to render all links in the gear unit immobile.

[0009] If, as in the case of the present invention, a shaft and a gear element are necessarily coupled, there is a one-to-one relationship between a rotational speed of the shaft and a rotational speed of the gear element. Either the rotational speed of the shaft or a rotational speed of the gear element can be arbitrarily set. The other rotational speed results unambiguously from this. Thus, there is exactly one rotational degree of freedom; that is, the rotor and the first shaft are coupled with a rotational degree of freedom of 1.

[0010] Preferably, there is a rotationally fixed connection between the first shaft and the rotor of the actuator. This means that the first shaft and the rotor always rotate at the same speed.

[0011] Due to the described coupling of the first shaft with the rotor of the actuator, the first shaft can be driven by means of the rotor or the actuator.

[0012] The second shaft is necessarily coupled to at least one gear element of the transmission. Therefore, there is a one-to-one relationship between the rotational speed of the second shaft and the rotational speed of the gear element; that is, the coupling has a rotational degree of freedom of 1.

[0013] The transmission component is a shaft, an axle, or a gear.

[0014] The degree of freedom of the transmission is preferably 1. This means that, in particular, an input shaft and an output shaft of the transmission are coupled with a degree of freedom of freedom or rotational freedom of 1, and accordingly there is a one-to-one relationship between a rotational speed of the input shaft and a rotational speed of the output shaft.

[0015] According to the invention, a synchronizing device is provided to connect the first shaft and the second shaft in a rotationally fixed yet detachable manner. Such synchronizing devices are known from synchronized transmissions in motor vehicles.

[0016] The synchronizing device provides a first friction surface and a second friction surface. The first shaft is fixed to the first friction surface, and the second shaft is fixed to the second friction surface. By shifting the two friction surfaces relative to each other, they can be brought into contact, so that a torque is transmitted between them through friction. This torque causes the rotational speeds of the friction surfaces, and thus the rotational speeds of the first and second shafts, to synchronize.

[0017] Once the rotational speeds are matched, the synchronizing device establishes a rotationally fixed, positive-locking connection between the first and second shafts. This connection is detachable. After detaching the connection, the first and second shafts can rotate independently of each other. Preferably, a splined connection is used to create the positive-locking connection.

[0018] The synchronizing device can comprise, for example, a shift sleeve with shift forks, a retaining spring with pressure pieces, a synchronizer body, a synchronizer ring with a locking toothing and a first friction surface, and a shift toothing with a second friction surface. The function of the individual components is known from automotive engineering.

[0019] The synchronizing device allows the actuator to be engaged even when the first and second shafts are rotating at different speeds. This reduces the risk of damage due to incorrect operation.

[0020] In a preferred embodiment, a first gear is provided that is mounted on the second shaft. The first gear is frictionally, positively, and / or materially bonded to the second shaft. In particular, there is a rotationally fixed connection between the first gear and the second shaft.

[0021] The first gear and a second gear mesh together.

[0022] The second gear is part of the transmission. Accordingly, the second gear is designed to transmit a torque flow from the input shaft to the output shaft of the transmission. This means that the second gear transmits a torque associated with this torque flow between two other gears of the transmission with which it meshes, or that the gear is mounted on a shaft, i.e., it is frictionally, positively, and / or materially bonded to the shaft, in particular rotationally fixed, and transmits a torque associated with this torque flow between the shaft and another gear of the transmission with which it meshes.

[0023] In this type of further development, it is not necessary to shift the first gear relative to the second gear in order to move the gearbox with the actuator. Instead, a connection between the actuator and the gearbox can be established via the synchronizing device.

[0024] A preferred embodiment of the invention is described in Fig. Figure 1 is shown. Matching reference numbers indicate identical or functionally equivalent features. In detail, it shows: Fig. 1 a wind turbine gearbox with actuator.

[0025] The in Fig.The wind turbine gearbox 101 shown in Figure 1 has a first planetary stage 103, a second planetary stage 105, and a spur gear stage 107. The first planetary stage 103 is driven via an input shaft 109. The first planetary stage 103, in turn, drives the second planetary stage 105. Finally, a sun shaft 111 of the second planetary stage 105 is rotationally fixed to a first gear 113 of the spur gear stage 107. In this way, the first gear 113 is driven. The first gear 113 meshes with a second gear 115 of the spur gear stage 107. A generator is driven via an output shaft 117, which is rotationally fixed to the second gear 115.

[0026] The input shaft 109, the first planetary stage 103, the second planetary stage 105, the sun shaft 111, the first gear 113, the second gear 115, and the output shaft 117 transmit a torque flow 119 from the input shaft 109 to the output shaft 117. A third gear 121, which meshes with the first gear 113, is not located within this torque flow 119. The third gear 121 serves to couple an actuator to the wind turbine gearbox 101.

[0027] A rotor of the actuator drives an auxiliary shaft 123. A synchronizing device 125 establishes a rotationally fixed connection between the auxiliary shaft 123 and a shaft stub 127 formed by the third gear 121. In this way, the auxiliary drive can rotate the first gear 113 and thus also the other gear elements of the wind turbine gearbox 101.

[0028] If the wind turbine gearbox 101 is not at a standstill, the first gear 113 in particular rotates. Since the third gear 121 is permanently meshed with the first gear 113, the third gear 121 and the stub shaft 127 also rotate. Before a rotationally fixed, positive-locking connection is established between the stub shaft 127 and the auxiliary shaft 123, the synchronizing device 125 synchronizes the rotational speeds of the stub shaft 127 and the auxiliary shaft 123. Reference sign 101 Wind turbine gearboxes 103 first planetary stage 105 second planetary stage 107 Spur gear stage 109 Input shaft 111 Sun wave 113 first gear 115 second gear 117 Output wave 121 third gear 123 Auxiliary shaft 125 Synchronizing device 127 wave stubs

Claims

[1] Arrangement comprising a wind turbine gearbox (101), an actuator, a first shaft (123) and a second wave (127); where the first shaft (123) is necessarily coupled to a rotor of the actuator; and wherein the second shaft (127) is necessarily coupled to at least one gear element (121) of the gearbox (101); characterized by a synchronizing device (125); wherein the synchronizing device (125) is designed to connect the first shaft (123) and the second shaft (127) in a rotationally fixed and detachable manner. [2] Arrangement according to claim 1; characterized bya first gear (121) and a second gear (113); wherein the first gear (121) and the second gear (113) mesh with each other; wherein the first gear (121) is mounted on the second shaft (127); and wherein the second gear (113) is configured to transmit a torque flow from an input shaft (109) of the transmission (101) to an output shaft (117) of the transmission (101).

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