CN109555824B

CN109555824B - Tensioning transmission device, variable pitch system and wind generating set

Info

Publication number: CN109555824B
Application number: CN201710891722.4A
Authority: CN
Inventors: 郭拥军; 李倩; 武青虎
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2022-02-25
Anticipated expiration: 2037-09-27
Also published as: CN109555824A

Abstract

The invention provides a tensioning transmission device, a variable pitch system and a wind generating set. Tensioning transmission passes through traction member and second rotary part cooperation transmission, and tensioning transmission includes: a fixed base; a first rotating member pivotally connected to the fixed base; and a first tension pulley and a second tension pulley which are respectively supported on the outer sides of the traction components and simultaneously press the traction components towards each other, and the first tension pulley and the second tension pulley can synchronously swing along a preset track under the action of the traction components. The stress state of the traction part in the working process can be adjusted, the phenomenon that tooth jumping or local breakage is caused due to the fact that local stress of the traction part is concentrated is avoided, and one or more purposes of reducing the initial pretightening force needed by the traction part are achieved.

Description

Tensioning transmission device, variable pitch system and wind generating set

Technical Field

The invention relates to the technical field of mechanical transmission, in particular to a tensioning transmission device, a variable pitch system and a wind generating set.

Background

As an important link in power transmission, the service life and the use reliability of the transmission device are particularly important. However, in general, in order to ensure that the traction member can be sufficiently wound around the rotating member, it is necessary to apply tension to the traction member by a tensioning device.

For example, in a belt transmission device, in order to ensure that a belt can be sufficiently wound around two driving pulleys, a tensioning device is required to apply a tensioning force to the belt, so that the belt is always sufficiently wound around the two driving pulleys in the working process and is sufficiently engaged with the driving pulleys, and the belt is prevented from sliding. However, in a specific working process, the belts on two sides of the driving wheel are often subjected to different tensile forces, so that a phenomenon of local stress concentration occurs on the belt part on one side of the driving wheel, and once the phenomenon of local stress concentration occurs on the belts, the problem of breakage of the belts possibly occurs, and further the failure of the transmission device is caused.

Especially in the field of wind power generation, the reliability of the traction components (e.g. toothed belts) is of more critical importance when using a transmission in the pitch system of the blades. Moreover, in the specific implementation process of the pitch system, after the traction component is installed on the rotating component, an initial pre-tightening force is usually applied to the traction component through the pre-tightening device in a certain tension range. After the traction part is pre-tightened, internal stress can be generated in the structure of the traction part, and once two edges of the traction part are subjected to unbalanced tension in the working process, the two edges are likely to break, so that the transmission device fails. However, in the existing scheme, the pitch control driving system can only meet the wrap angle requirement of the traction part, and cannot adjust the problem of local stress concentration of the traction part, so that the problem of tooth skipping or local fracture of the traction part is easily caused.

Therefore, a new tensioning transmission device, a pitch system and a wind generating set are needed.

Disclosure of Invention

According to the embodiment of the invention, the tensioning transmission device, the variable pitch system and the wind generating set are provided, so that the stress state of the traction component in the working process can be adjusted, the phenomenon that the traction component is locally stressed to cause tooth jumping or local fracture is avoided, and one or more purposes of reducing the pre-tightening force required by the traction component are achieved.

According to an aspect of an embodiment of the present invention, there is provided a tension transmission device that cooperatively transmits with a second rotation member through a traction member, the tension transmission device including: a fixed base; a first rotating member pivotally connected to the fixed base; and a first tension pulley and a second tension pulley which are respectively supported at the outer sides of the traction members between the first rotating member and the second rotating member and simultaneously press the traction members toward each other, and the first tension pulley and the second tension pulley can synchronously swing along a predetermined track under the action of the traction members.

According to an aspect of an embodiment of the present invention, the fixing base includes: a fixed portion fixed to the external support structure by a connector; and an extension portion protrudingly provided on the fixed portion and having a first receiving space receiving the first rotating member.

According to an aspect of an embodiment of the present invention, the tension transmission device further includes a tension pulley holding member that connects the first tension pulley and the second tension pulley, respectively, to maintain a constant distance between the first tension pulley and the second tension pulley.

According to an aspect of the embodiment of the present invention, the tension pulley holding member defines the predetermined trajectory as an arc trajectory or a straight trajectory.

According to an aspect of an embodiment of the present invention, the tension pulley holding member is attached to the fixed base.

According to an aspect of an embodiment of the present invention, a tension pulley holding member includes: a connection part rotatably connected to the fixed base; and

and a support portion connected to the connection portion and the first and second tension pulleys and rotated around a rotation axis of the first rotating member by the connection portion to define the predetermined trajectory as an arc trajectory centering on the rotation axis of the first rotating member, or connected to the connection portion and the first and second tension pulleys and reciprocated in a direction perpendicular to a line connecting the first and second rotating members by the connection portion to define the predetermined trajectory as a straight trajectory in a direction perpendicular to the line connecting the first and second rotating members.

According to an aspect of the embodiment of the present invention, the supporting portion includes a second accommodating space communicating with the first rotating member, and the first tension pulley and the second tension pulley are supported in the second accommodating space so as to form a passing space through which the traction member can pass between the first rotating member, the first tension pulley, and the second tension pulley through the second accommodating space.

According to an aspect of the embodiment of the present invention, the support portion includes two plate bodies arranged opposite and parallel to each other, the second accommodation space is formed between the two plate bodies, and the first tension pulley and the second tension pulley are rotatably supported on the two plate bodies, respectively.

According to an aspect of an embodiment of the present invention, a tension pulley holding member includes: the connecting arm is fixedly connected with the first tensioning wheel and the second tensioning wheel through two opposite end parts of the connecting arm respectively; and a guide rail defining the predetermined trajectory as an arc trajectory centering on a rotation axis of the first rotating member or a straight trajectory along a direction perpendicular to a line connecting the first rotating member and the second rotating member, and the first tension pulley and the second tension pulley being slidably coupled to the guide rail.

According to an aspect of an embodiment of the present invention, the tension transmission device further includes a limiting member cooperating with the tension pulley holding member to limit a maximum swing amplitude of the first tension pulley and/or the second tension pulley.

According to an aspect of an embodiment of the present invention, the tension transmission device further includes a damping member hingedly connected between the first tension pulley and the fixed structure and/or between the second tension pulley and the fixed structure to limit a vibration frequency of the corresponding first tension pulley and/or second tension pulley by the damping member.

According to another aspect of the embodiments of the present invention, there is also provided a pitch system for driving a blade of a wind turbine generator system to pitch, the blade being rotatably connected to a hub of the wind turbine generator system by a pitch bearing, the pitch system including: a drive motor; and the tension transmission device, wherein the first rotating part is connected with the driving motor; the second rotating part is connected with the blade root; and the traction component surrounds the first rotating component and the second rotating component and is in matched transmission with the first rotating component and the second rotating component respectively.

According to another aspect of an embodiment of the invention, the fixed base is connected to the hub.

According to another aspect of an embodiment of the invention, the traction means is a toothed belt.

According to another aspect of the embodiment of the invention, the second rotating part is an outer ring of a pitch bearing connected with the root of the blade, and the traction part is matched with the outer ring to rotate.

According to another aspect of the embodiment of the invention, the second rotating component is an inner ring of the pitch bearing connected with the root of the blade, the inner ring comprises an annular extension protruding from an outer ring of the pitch bearing along the axial direction of the pitch bearing, and the traction component is matched with the inner ring to rotate through the annular extension.

According to another aspect of the embodiment of the invention, the second rotating member is an annular transition connecting section connected with the root of the blade, and the traction member is matched with the blade to rotate through the transition connecting section.

According to another aspect of an embodiment of the invention, the transition piece is of unitary construction with the blade.

According to another aspect of the embodiment of the invention, the outer periphery of the transition connecting section is convexly provided with an annular supporting surface along the radial direction, and the traction part is matched with the blade to rotate through the supporting surface.

According to a further aspect of the embodiment of the invention, the wind generating set comprises the variable pitch system.

In summary, according to the tension transmission device, the pitch control system and the wind generating set of the embodiment of the invention, the tension transmission device is in matched transmission with the second rotating part through the traction part, wherein one of the first rotating part and the second rotating part is a driving wheel and is connected with the driving mechanism, and the other one of the first rotating part and the second rotating part is a driven wheel and is connected with the executing mechanism. The first rotating member is rotatably supported by the fixed base. And the first tensioning wheel and the second tensioning wheel are respectively positioned outside the traction part between the first rotating part and the second rotating part and simultaneously press the traction part towards each other, and the first tensioning wheel and the second tensioning wheel can synchronously swing along a preset track under the action of the traction part. Therefore, the stress state of the traction component in the working process can be adjusted, and the initial pretightening force required by the traction component is reduced. Therefore, in the working process of the tensioning transmission device, the problem that the traction part fails due to tooth jumping or local breakage caused by local stress concentration of the traction part can be avoided. And can inject the cornerite of the traction part in the reasonable scope to improve the reliability of the tensioning transmission device, guarantee the variable-pitch precision of the variable-pitch system, and increase the service life of the traction part, the tensioning rotation device and the variable-pitch system.

Drawings

The invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which:

other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.

FIG. 1 is a schematic illustration of a static state configuration of a tension drive according to one embodiment of the present invention;

FIG. 2 is a schematic view of the operating condition of the tensioning drive of FIG. 1;

FIG. 3 is a schematic illustration of a state of a particular example of a tensioning drive based on the principles of the construction of FIG. 1;

FIG. 4 is a schematic view of another state of the tensioning drive of FIG. 3;

FIG. 5 is a cross-sectional schematic view of the tensioning drive shown in FIGS. 3 and 4 taken along the longitudinal direction;

FIG. 6 is a schematic cross-sectional view of a partial structure of a pitch system according to an embodiment of the invention;

FIG. 7 is a schematic view of a tension drive according to another embodiment of the present invention in use;

FIG. 8 is a schematic view of a tension drive according to yet another embodiment of the present invention in use;

FIG. 9 is a schematic view of a tension drive according to yet another embodiment of the present invention in use;

FIG. 10 is a schematic view of a tension drive according to yet another embodiment of the present invention in use;

FIG. 11 is a cross-sectional structural schematic view of one particular example of a second rotating component cooperating with a traction component in a pitch system according to an embodiment of the invention;

FIG. 12 is a cross-sectional structural schematic view of another specific example of a second rotating component mating with a traction component in a pitch system according to an embodiment of the invention;

FIG. 13 is a schematic cross-sectional view of yet another specific example of a second rotating component cooperating with a tractive component in a pitch system according to an embodiment of the invention.

Wherein:

1-a pitch system;

100-a tensioning transmission; 101-a tensioning transmission; 102-a tensioning transmission; 103-tensioning transmission; 104-a tensioning transmission; 105-a tensioning transmission;

11-a fixed base; 111-a stationary portion; 111 a-mounting port; 111 b-connection hole; 112-an extension; 12-a first rotating member; 121-rolling bearings; 122-end cap; 14-a first tensioning wheel; 15-a second tensioning wheel; 151-rolling bearing; 152-an end cap; 16-a tensioner retaining member; 161-a linking moiety; 162-a support portion; 162 a-a first plate; 162 b-a second plate body; 162 c-a second accommodating space; 163-a plain bearing; 164-a linker arm; 165-an arc-shaped guide slot; 166-linear guide groove; 17-a cushioning component;

20-a transmission wheel;

30-a pitch bearing; 31-an outer ring; 32-inner ring; 321-an annular extension; 322-gear teeth;

40-a hub;

50-blade root; 501-gear teeth; 51-a transition junction; 511-ring connector; 512-a support surface; 513-gear teeth;

60-a traction member.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description will be given with the directional terms shown in the drawings and will not be used to limit the specific structure of the pitch system and the tensioning transmission of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

The tensioning transmission device provided by the embodiment of the invention is connected between the driving mechanism and the actuating mechanism, the power of the driving mechanism is transmitted to the actuating mechanism to drive the actuating mechanism to work, and the tensioning force of the traction part and the wrap angle formed on the transmission part can be controlled within a reasonable range all the time when the tensioning transmission device works. The reliability of use of the tensioning drive can thus be increased and the service life of the traction means can be increased.

For a better understanding of the invention, a tensioning transmission and a pitch system according to an embodiment of the invention will be described below with reference to fig. 1 to 13.

Fig. 1 is a schematic structural view of a stationary state of a tension drive 100 according to an embodiment of the present invention. It should be noted that fig. 1 only schematically illustrates the principle of the tension transmission device 100, so that a part of the structure of the tension transmission device 100 is not shown, and fig. 1 illustrates the tension transmission device 100 in an initial state (i.e., an unstressed state) by the traction member 60 cooperating with the second rotating member (illustratively, the rotating wheel 20). As shown in fig. 1, in one embodiment, the tension drive 100 includes: a fixed base 11 (only a fixed fulcrum of the first rotating member 12 is illustrated in fig. 1, and therefore, a specific example in fig. 3 needs to be combined), a first rotating member 12, a first tension pulley 14, and a second tension pulley 15. The traction member 60 surrounds the first rotating member 12 and the second rotating member, and is in transmission with the first rotating member 12 and the second rotating member respectively, wherein one of the first rotating member 12 and the second rotating member is a driving wheel and is connected with the driving mechanism, and the other one is a driven wheel and is connected with the actuating mechanism. The first rotating member 12 is rotatably supported by the fixed base 11. And the first tension pulley 14 and the second tension pulley 15 are respectively positioned outside the traction member 60 between the first rotating member 12 and the second rotating member and simultaneously press the traction member 60 toward each other, and the first tension pulley 14 and the second tension pulley 15 can synchronously oscillate along a predetermined trajectory by the traction member 60.

Fig. 2 is a schematic structural view of an operating state of the tension driver 100 of fig. 1. Fig. 2, however, likewise only shows the principle design of the tensioning drive 100. Referring to fig. 1 and 2, when the first rotating member 12 and the second rotating member are driven by the pulling member 60, the pulling member 60 is subjected to different pulling forces on two sides of the first rotating member 12, so that the tightness of the two sides is inconsistent. That is, the traction member 60 rotates by an angle α from the initial position (the dashed line position shown in fig. 2) to the force receiving position (the solid line position shown in fig. 2). At this time, the first tension pulley 14 and the second tension pulley 15 can synchronously oscillate along a predetermined track by the traction member 60. Since the first tension pulley 14 and the second tension pulley 15 can respectively provide pressing force for the traction member 60 from two sides of the first rotating component 12, that is, the tension force applied to the tight side of the traction member 60 is transmitted to the loose side through the two tension pulleys synchronously swinging along a predetermined track, the stress state of the traction member 60 in the working process can be adjusted, and thus the initial pre-tightening force required by the traction member 60 is reduced. Therefore, the stress environment of the traction component 60 in working can be improved, and the phenomenon that the traction component 60 is subjected to tooth jumping or local fracture due to local stress concentration of the traction component 60 is avoided. The service life of the traction element 60 can thus be increased. And the wrap angle of the traction member 60 can be limited within a reasonable range, thereby improving the transmission reliability of the traction member 60.

Fig. 3 is a schematic view of a state of the tensioning drive 101 in a specific example based on the structural principle of fig. 1; FIG. 4 is a schematic view of another state of the tension drive 101 shown in FIG. 3; FIG. 5 is a cross-sectional schematic view of the tensioning drive 101 shown in FIGS. 3 and 4 taken along the longitudinal direction; FIG. 6 is a schematic cross-sectional view of a part of the structure of a pitch system 1 according to an embodiment of the invention. It should be noted that fig. 3 to 5 are a specific structural example based on the structural principle of the tension transmission device 100 in the above embodiment, and fig. 6 shows only a partial structure of the pitch system 1, but does not show a complete structural diagram.

Fig. 6 schematically shows an example of applying the tension transmission device 101 to a wind turbine generator set to drive in cooperation with the pitch bearing 30, so the tension transmission device 101 and the pitch system 1 of the present embodiment will be described below by taking the application of the tension transmission device 101 to a wind turbine generator set to drive in cooperation with the pitch bearing 30 as an example. However, as will be understood from the following embodiments, the tension transmission device 101 according to the embodiment of the present invention may be used in other fields, and is connected between a driving mechanism and an actuator to achieve the purpose of power transmission.

The pitch system 1 comprises: a driving motor (not shown in the figure), a tension transmission device 101, a second rotating component and a traction component 60, wherein the first rotating component 12 in the tension transmission device 101 is used as a driving wheel and is in transmission connection with the driving motor, and the second rotating component is connected with a blade (not shown in the figure) of the wind generating set and drives the blade to rotate. In the present embodiment, the tension transmission device 101 includes: the tension roller device comprises a fixed base 11, a first rotating member 12, a first tension roller 14, a second tension roller 15 and a tension roller holding member 16.

In the pitch system 1, for example, in order to achieve accurate transmission, the traction member 60 in the tensioning transmission 101 is a conveyor belt, such as a toothed belt, and the first rotating member 12 is a pulley cooperating with the toothed belt. However, it should be noted that when the tensioning drive device 101 is applied to other fields, the traction member 60 may also be a conveyor chain or a wire traction, and the first rotating member 12 is a sprocket or other corresponding rotating member that is driven by the conveyor chain.

Typically, the blades of the wind turbine generator set are rotatably connected to a hub (not shown in the drawings) through a pitch bearing 30, the pitch bearing 30 includes an outer ring 31 and an inner ring 32, for example, in the present embodiment, the outer ring 31 is connected to the blades, and the inner ring 32 is connected to the hub, so that the tension transmission device 101 needs to cooperate with the outer ring 31 of the pitch bearing 30 to drive the outer ring 31 to drive the blades to perform a pitch action. Exemplarily, in the present embodiment, the first rotating member 12 is a pulley having a shaft hole to be drivingly connected with a reducer connected with a driving motor through the shaft hole.

According to a specific example of the present invention, the fixed base 11 includes a fixed portion 111 and an extension portion 112, wherein the fixed portion 111 may be fixed to an external support structure by a coupling, and the extension portion 112 is protrudingly provided on the fixed portion 111 and may be used to receive the first rotating member 12. The fixed base 11 may be fixed to the hub in order to be able to cooperate with the outer ring 31 for transmission. In the present embodiment, the fixing portion 111 is exemplarily a disk-shaped structure, and a mounting opening 111a is opened at a substantially central position of the disk-shaped structure, and a plurality of connection holes 111b are provided at an edge of the fixing portion 111. And correspondingly, a flange connection edge (not shown in the drawings) corresponding to the fixing portion 111 needs to be provided on the hub. Thus, the fixing portion 111 can be fitted to the outside of the speed reducer connected to the drive motor along the mounting opening 111a, and the fixing base 11 can be fixed to the hub by using a fastener via the coupling hole 111b provided in the fixing portion 111 and the flange hole provided on the flange coupling edge provided on the hub.

In the present embodiment, the extension portion 112 is a sleeve-like structure protruding from the fixing portion 111, that is, the extension portion 112 has a first receiving space (not indicated in the figure) for receiving the first rotating member 12. The sleeve-like structure means that, in order to allow the traction member 60 to surround the first rotating member 12, the wall of the space in which the first rotating member 12 is located cannot be closed in the circumferential direction of the first rotating member 12, and a passing space through which the traction member 60 can pass is provided between the first rotating member 12 and the extension portion 112 in the circumferential direction. In an alternative embodiment, the fixing portion 111 and the extension portion 112 are of a unitary structure in order to satisfy the structural strength of the fixing base 11. The first rotating member 12 is rotatably disposed in the first accommodation space of the extension portion 112 by a rolling bearing 121 so that the first rotating member 12 can rotate about its rotation axis. It is understood that the first rotating member 12 may also be rotatably supported in the first accommodating space by a sliding bearing. After the first rotating member 12 is installed in the first receiving space of the extending portion 112, the axial pressing force is provided to the first rotating member 12 and the rolling bearing 121, etc. through the end cap 122.

Of course, the embodiment of the present invention is not limited with respect to the specific structure of the fixing portion 111 and the extension portion 112 of the fixing base 11. The fixed portion 111 may be made of other shaft seats or a frame structure, and the extending portion 112 may be other forms of bosses as long as the purpose of rotatably supporting the first rotating member 12 by the extending portion 112 is achieved.

In addition, based on the above structure and function of the fixing base 11, it is understood that in other exemplary embodiments, the fixing base 11 may be only formed of a plate-shaped or frame structure and may be fixed to the external support structure by a fastener. Of course, the first rotating member 12 may be a pulley having a rotating shaft, and in this case, the first rotating member 12 may be connected to the fixed base 11 formed of a plate-like or frame structure by the rotating shaft thereof in a rotatable manner.

In addition, the embodiment of the present invention is not limited to the installation position of the fixing base 11, for example, in other embodiments, the fixing base 11 may be fixed to other fixing structures besides the hub. For example, the fixed base 11 may be fixed to another support table or support frame provided on the hub, as long as the first rotating member 12 can be supported by the fixed base 11, and the first rotating member 12 can be driven by the traction member 60 and the outer ring 31 in a matching manner, so as to achieve the purpose of driving the blades to change the pitch.

With continued reference to fig. 3 to 6, according to an embodiment of the present invention, the tension transmission apparatus 101 further includes a tension pulley holding member 16 to define a predetermined trajectory as an arc trajectory by the tension pulley holding member 16, and the tension pulley holding member 16 connects the first tension pulley 14 and the second tension pulley 15, respectively, to maintain a constant distance between the first tension pulley 14 and the second tension pulley 15.

In the present embodiment, the tension pulley holding member 16 exemplarily includes a connecting portion 161 and a supporting portion 162, wherein the connecting portion 161 is rotatably connected to the fixed base 11. Specifically, the connecting portion 161 is connected to the extending portion 112 of the fixed base 11, and since the extending portion 112 may be of a sleeve-like structure as mentioned in the above-mentioned embodiment, correspondingly, the connecting portion 161 is provided with a mounting opening (not indicated in the drawings) adapted to the extending portion 112. Thus, the connecting portion 161 can be rotatably enclosed outside the extending portion 112 through the mounting opening using a slide bearing 163 (as shown in fig. 5). Thereby, the connecting portion 161 can bring the supporting portion 162 connected thereto to rotate about the rotation axis of the first rotating member 12. That is, the tension sheave holding member 16 defines the predetermined trajectory as an arc trajectory centered on the rotation axis of the first rotating member 12. However, the rotation center of the tension pulley holding member 16 is not limited to coincide with the rotation axis center of the first rotating member 12.

The support portion 162 includes a first plate 162a and a second plate 162b arranged opposite and parallel to each other, a second accommodation space 162c is formed between the first plate 162a and the second plate 162b, and the second accommodation space 162c communicates with the first accommodation space provided in the extension portion 112 of the fixed base 11, that is, the second accommodation space 162c communicates with the first rotation member 12. The first tension pulley 14 and the second tension pulley 15 are rotatably supported in the second housing space 162c, respectively, and maintain a constant distance between the first tension pulley 14 and the second tension pulley 15. Therefore, the first tension pulley 14 and the second tension pulley 15 are symmetrically located on both sides of the first rotating member 12, so that a line connecting the first rotating member 12, the first tension pulley 14, and the second tension pulley 15 is configured as a triangle.

In the present embodiment, the first tension pulley 14 and the second tension pulley 15 are connected in the same manner, and as shown in fig. 4 and 5, for example, the second tension pulley 15 is configured such that both axial ends of the second tension pulley 15 are rotatably supported by the first plate 162a and the second plate 162b through the rolling bearings 151, respectively. For example, the rolling bearing 151 may also be replaced by a sliding bearing. After the second tension wheel 15 is disposed in the second accommodating space 162c, the axial pressing force can be provided to the second tension wheel 15 and the rolling bearing 151 through the end cap 152. Thus, a winding space through which the traction member 60 (toothed belt) can be wound is formed between the first tension pulley 14 and the second tension pulley 15 by the second housing space 162 c.

The traction member 60 can pass through the first and second accommodating spaces 162c between the first tension pulley 14 and the first rotating member 12 and between the second tension pulley 15 and the first rotating member 12, respectively, and simultaneously surround the first rotating member 12 and the outer ring 31 of the pitch bearing 30. So that the first tension pulley 14 and the second tension pulley 15 are located outside the traction member 60 between the first rotating member 12 and the outer ring 31, respectively, and press the traction member 60 toward each other.

In an alternative embodiment, the connecting portion 161 and the support portion 162 are of a unitary construction in order to provide structural strength to the tensioner retaining member 16. In addition, in other embodiments, it is understood that the supporting portion 162 of the tensioning wheel holding member 16 may also be formed by a frame structure, so as to form the second accommodating space 162c by the frame.

Of course, in other embodiments, the tensioning wheel holding member 16 may be rotatably mounted on the fixed base 11 except for the extension portion 112, and in this case, the tensioning wheel holding member 16 defines the predetermined trajectory as an arc trajectory having the center of the connecting portion 161 thereof as the rotation center. Of course, the tension pulley holding member 16 may be fixed to a structure other than the fixed base 11 as long as the first tension pulley 14 and the second tension pulley 15 can be swung along a predetermined arc trajectory to press the traction member 60 to the opposite sides of the traction member 60. The tensioning wheel holding member 16 is provided in such a manner that the first tensioning wheel 14 and the second tensioning wheel 15 can synchronously oscillate and press the traction member 60 toward each other, so as to limit the wrap angle of the traction member 60 within a reasonable range and ensure effective meshing transmission of the traction member 60.

In the pitch system 1, the driving motor drives the first rotating part 12 to rotate, and the traction part 60 in transmission fit with the first rotating part 12 drives the outer ring 31 of the pitch bearing 30 to rotate, so that the blade connected with the outer ring 31 can perform pitch control action. During the driving of the blade pitch by the pitch system 1, as shown in fig. 6, when the first rotating member 12 starts to rotate in mesh with the traction member 60 under the driving of the driving motor, for example, when the first rotating member 12 rotates toward the clockwise direction (as viewed in fig. 6), the outer ring 31 starts to rotate first due to the portion of the traction member 60 located on the left side of the first rotating member 12. That is, the portion of the pulling member 60 located on the left side of the first rotating member 12 is subjected to a greater pulling force than the portion of the pulling member 60 located on the right side of the first rotating member 12, and at this time, the pulling member 60 exhibits a tight side and a loose side on both sides of the first rotating member 12.

Therefore, the first tension pulley 14 pressed against the portion of the traction member 60 on the left side of the first rotating member 12 receives the lifting force in the clockwise direction, and the second tension pulley 15 swings clockwise along the circular arc locus defined by the tension pulley holding member 16 along with the first tension pulley 14. Therefore, the slack side of the traction member 60 located at the right side of the first rotating member 12 is pressed clockwise by the swinging of the second tension pulley 15, and finally the tensile force applied to the slack side of the traction member 60 can be transmitted to the slack side.

Therefore, the first tension pulley 14 and the second tension pulley 15 synchronously swing under the action of the traction member 60, so that the stress state of the traction member 60 on the two sides of the first rotating member 12 is automatically adjusted. Thus, the requirement for the initial pre-tightening force of the traction component 60 can be reduced, so that the stress environment of the traction component 60 can be improved, and the aims of delaying the fatigue damage of the traction component 60, reducing the failure risk of the traction component 60 and prolonging the service life of the traction component 60 can be fulfilled. And the fracture caused by the local stress concentration of the traction component 60 can be avoided, thereby improving the transmission use reliability of the traction component 60. Therefore, the use reliability of the variable pitch system 1 and the variable pitch transmission accuracy can be improved, and the problem that the transmission structure in the variable pitch system 1 goes wrong to influence the normal work of the whole wind generating set is avoided.

In addition, since the first tension pulley 14 and the second tension pulley 15 rotate around the rotation axis of the first rotating member 12, and the angle formed between the first tension pulley 14 and the second tension pulley 15 does not change, it can be ensured that the traction member 60 always has a constant wrap angle, and thus the transmission reliability of the tension transmission device can be effectively improved.

In addition, in an alternative embodiment, in order to prevent the swing amplitude of the first tensioning wheel 14 and/or the second tensioning wheel 15 from being too large to effectively adjust the force applied to the traction member 60, a limiting member (not shown in the drawings) may be further provided in the tensioning transmission device 101 in the above embodiment. Of course, the specific installation position and installation structure of the limiting member in the embodiment of the present invention are not limited, and any structure may be used as long as the limiting member is installed in the movement path of the tension pulley holding member 16 and can limit the maximum oscillation width of the first tension pulley 14 and/or the second tension pulley 15.

Illustratively, the limiting member may include a stopper provided at an edge of the fixing portion 111 of the fixing base 11 shown in fig. 6 and located on one of left and right sides (in the viewing direction shown in fig. 6) of the tension pulley holding member 16. Through the stop blocks arranged on the two sides of the tensioning wheel holding component 16, the swing amplitude of the tensioning wheel holding component 16 can be limited in the process that the tensioning wheel holding component 16 rotates clockwise and anticlockwise respectively, so that the situation that the swing amplitude of the first tensioning wheel 14 and the swing amplitude of the second tensioning wheel 15 are too large under the action of the traction component 60 can be avoided, the situation that the stress of the traction component 60 can be automatically adjusted all the time in the working process of the traction component 60 by the first tensioning wheel 14 and the second tensioning wheel 15 is guaranteed, and the problem that the local stress is concentrated on the traction component 60 is avoided.

Fig. 7 is a schematic view of a use state of the tension drive 102 according to another embodiment of the present invention. As shown in fig. 7, the same components in the present embodiment as those in the tension transmission 101 of the above embodiment are given the same reference numerals for the sake of easy understanding, and the structure that has been explained will not be described again. It should be noted, however, that only the principle structure of the tension drive 102 is illustrated in fig. 7, and therefore, some components of the tension drive 102 are not shown. The tension transmission device 102 in this embodiment includes: a fixed base 11 (not shown), a first rotating member 12, a first tension pulley 14, a second tension pulley 15, and a tension pulley holding member 16.

The difference from the tension transmission 101 in the above-described embodiment is that the tension pulley holding member 16 in the tension transmission 102 includes the connecting arm 164 and the arc-shaped guide groove 165. Specifically, in the present embodiment, the connecting arm 164 has opposite end portions by which the first tensioning wheel 14 and the second tensioning wheel 15 are fixedly connected, respectively, so that the first tensioning wheel 14 and the second tensioning wheel 15 are held positionally fixed relative to each other outside the traction member 60 between the first rotating member 12 and the transmission wheel 20, and the traction member 60 can be pressed from both sides toward each other.

The arc-shaped guide groove 165 is illustratively a circular arc-shaped sliding groove centered on the rotation axis of the first rotating member 12, and thus the predetermined trajectory is defined by the arc-shaped guide groove 165 as a circular arc-shaped trajectory centered on the rotation axis of the first rotating member 12. And the first tension pulley 14 and the second tension pulley 15 are slidably connected to the arc-shaped guide grooves 165, respectively, so that the first tension pulley 14 and the second tension pulley 15 can synchronously swing along a predetermined arc track through the cooperation of the connecting arm 164 and the arc-shaped guide grooves 165.

Specifically, in order to achieve the above-mentioned object by the connecting arm 164 and the arc-shaped guide groove 165, the first tension pulley 14 and the second tension pulley 15 may be rotatably connected to the sliders, respectively, and the two sliders connected to the first tension pulley 14 and the second tension pulley 15 may be slidably inserted into the arc-shaped guide groove 165, while the connecting arm 164 is fixedly connected between the two sliders, respectively. Of course, the connecting arm 164 can be fixedly connected to the two sliders on the side of the arc-shaped guiding groove 165 far away from the first tensioning wheel 14 and the second tensioning wheel 15, so that the side of the arc-shaped guiding groove 165 far away from the first tensioning wheel 14 and the second tensioning wheel 15 can provide a limiting function for the first tensioning wheel 14 and the second tensioning wheel 15 at the same time, and the first tensioning wheel 14 and the second tensioning wheel 15 are prevented from being disengaged from the arc-shaped guiding groove 165. Of course, the first tensioning wheel 14 and the second tensioning wheel 15 may be connected to the connecting arm 164 and the arc-shaped guiding groove 165 respectively by other connection methods, which is not limited by the embodiment of the present invention. The tensioning drive 102 of this embodiment has the same advantages as the tensioning drive 101 of the previous embodiment and therefore will not be described again here.

In addition, by providing the connecting arm and the guide rail, a complicated manufacturing process that requires the provision of the tension pulley holding member 16 including the connecting portion 161 and the supporting portion 162 and rotatably connects the tension pulley holding member 16 to the fixed base 11 is eliminated, and therefore the structure and assembly of the tension transmission device 102 are simple. And can provide the stroke limiting effect for first take-up pulley 14 and second take-up pulley 15 through the both ends of guide rail, consequently can avoid first take-up pulley 14 and second take-up pulley 15 swing range too big and can not solve the concentrated problem of traction component 60 atress effectively to can further increase the life of traction component 60, improve the reliability in utilization of tensioning transmission 102 simultaneously.

Moreover, in the process that the first tensioning wheel 14 and the second tensioning wheel 15 slide along the arc-shaped guiding rail, the arc-shaped guiding rail can provide a certain friction force for the first tensioning wheel 14 and the second tensioning wheel 15, so that the swinging frequency of the first tensioning wheel 14 and the second tensioning wheel 15 under the action of the traction component 60 can be reduced, and the problems that the traction component 60 is locally stressed and is easily subjected to fatigue damage due to the influence of alternating load can be better solved.

In addition, for the tensioning transmission device 102 of the present embodiment, the arc-shaped guide groove 165 may be replaced by another guide rail, so that the purpose of synchronously swinging the first tensioning wheel 14 and the second tensioning wheel 15 along the predetermined arc track is achieved through the cooperation of the other guide rail and the connecting arm 164. In the present embodiment, the guide rail may be an arc-shaped guide rail (not shown in the figure), and the arc-shaped guide rail may also define the predetermined trajectory as an arc-shaped trajectory centered on the rotation axis of the first rotating member 12. Specifically, in order to slidably connect the first tension wheel 14 and the second tension wheel 15 to the guide rail, the surface of the guide rail facing the first tension wheel 14 and the second tension wheel 15 has a slide rail with a dovetail-shaped cross section, and the first tension wheel 14 and the second tension wheel 15 are respectively connected with a slide block, and the slide block has a slide groove matching with the dovetail-shaped slide rail of the guide rail. Thereby, the first tensioning wheel 14 and the second tensioning wheel 15 can be slidably connected to the guide rail simultaneously by means of a snap fit between the slide and the guide rail. And the connecting arm 164 is also fixedly connected to the sliders of the first tension pulley 14 and the second tension pulley 15, respectively, so as to maintain a constant distance between the first tension pulley 14 and the second tension pulley 15.

In the tension transmission device 102 according to the embodiment of the present invention, the installation positions of the arc-shaped guide groove 165 and the guide rail are not limited, and for example, the arc-shaped guide groove 165 or the guide rail may be provided on a plate body, and the plate body may be fixed to the fixed base 11, or the plate body may be fixed to another fixed structure, as long as the first tension pulley 14 and the second tension pulley 15 can be synchronously swung along a predetermined arc trajectory and pressed against the traction member 60 by engaging the arc-shaped guide groove 165 or the guide rail with the connecting arm 164.

Fig. 8 is a schematic view of the use of the tension drive 103 according to yet another embodiment of the invention. For ease of understanding, the same reference numerals are used for the same components in the tension drive 101 of the present embodiment as in the above embodiment, and the structure already explained will not be described again. It should be noted, however, that fig. 8 also only illustrates the principle structure of the tensioning drive 103, and therefore some components of the tensioning drive 103 are not shown. The tension transmission device 103 in this embodiment includes: a fixed base 11 (not shown in the figure), a first rotating member 12, a first tension pulley 14, a second tension pulley 15, and a tension pulley holding member 16.

The difference from the tension transmission 101 in the above-described embodiment is that the tension transmission 103 further includes a damping member 17 to limit the vibration frequency of the first tension pulley 14 and/or the second tension pulley 15 by providing the damping member 17. In the present embodiment, for example, one cushioning member 17 is provided between both sides of the tension sheave holding member 16 and the fixed structure, respectively, but it is also understood that the cushioning members 17 are provided between the first tension sheave 14 and the fixed structure and between the second tension sheave 15 and the fixed structure, respectively.

When the tensioning drive 103 is applied in a pitch system of a wind turbine, the above-mentioned fixed structure may then be understood as a hub of a wind turbine or other fixed structure arranged on the hub. When the tension transmission device 103 is applied to other technical fields, the fixing structure may be any structure capable of providing a supporting force for the buffering member 17 to achieve the purpose of limiting the vibration frequency of the first tension pulley 14 and/or the second tension pulley 15, as long as it is ensured that the buffering member 17 does not interfere with the movement of the corresponding first rotating member 12, the first tension pulley 14, and/or the second tension pulley 15.

It should be noted that, in order to realize the synchronous oscillation of the first tensioning wheel 14 and the second tensioning wheel 15 along the predetermined circular arc trajectory, the buffer members 17 need to be respectively hinged between the first tensioning wheel 14 and the fixed structure and/or between the second tensioning wheel 15 and the fixed structure. For example, the damping member 17 may be connected to the corresponding first tensioning wheel 14 and/or second tensioning wheel 15 by a universal joint or a fisheye bearing.

In particular, the cushioning member 17 may take the form of various linkages having a variable overall length and capable of providing a reactive force, for example, the cushioning member 17 may be a spring, may be a hydraulic ram, or may be a combination of a spring and a hydraulic ram, i.e., the cushioning member 17 may include a hydraulic ram and/or a spring. When the cushioning member 17 is a spring, it may be a compression spring or an extension spring, because both compression and extension can generate a reaction force, so that the vibration frequency generated by the first tensioning wheel 14 and/or the second tensioning wheel 15 under the action of the traction member 60 is effectively controlled, and the first tensioning wheel 14 and the second tensioning wheel 15 are prevented from frequently and excessively swinging to cause fatigue damage to the traction member 60.

Similarly, when the damping member 17 is a hydraulic cylinder, the hydraulic oil is applied in a direction to extend the piston rod or in a direction to retract the piston rod. It can be seen that the structural form of the cushioning member 17 may be various.

It should be noted here that, for the buffer member 17 including the hydraulic cylinder, it is known to those skilled in the art of hydraulic machinery how to control the hydraulic pressure in the hydraulic cylinder to operate the hydraulic cylinder, so that those skilled in the art can implement the buffer connection function of the hydraulic cylinder based on the technical solution disclosed in the present invention. For example, each hydraulic cylinder can be communicated with a hydraulic station, the hydraulic master station is connected with a controller, the controller controls the hydraulic pressure output by the hydraulic station, so as to control the pressure in the hydraulic cylinder, and provide a reaction force to the first tensioning wheel 14 and/or the second tensioning wheel 15 while the total length of the hydraulic cylinder is changed, so that the tensioning transmission device 103 of the embodiment of the invention can stably transmit load, and prevent the first tensioning wheel 14 and/or the second tensioning wheel 15 from frequently and excessively swinging to cause fatigue damage to the traction component 60.

The number of the cushioning members 17 between the first tensioning sheave 14 and the fixed structure and/or between the second tensioning sheave 15 and the fixed structure may be one as shown in fig. 8, or may be plural. Further, when a plurality of cushioning members 17 are provided between two members, the structures of the cushioning members 17 may be different.

In other embodiments, the first tensioning wheel 14 and the second tensioning wheel 15 may be held outside the traction member 60 between the first rotating member 12 and the second rotating member by a structure other than the tensioning wheel holding member 16, and the traction member 60 may be pressed toward each other at the same time, and the traction member 60 may synchronously swing along the circular arc track by the action of the traction member 60, which is not limited to this embodiment of the present invention.

Fig. 9 is a schematic view of a use state of the tension drive 104 according to yet another embodiment of the present invention. For ease of understanding, the same reference numerals are used for the same components in the tension transmission device 104 shown in fig. 9 as in the tension transmission device 101 in the above-described embodiment, and the detailed description of the structure already described will not be repeated. Unlike the tension transmission device 101 in the above embodiment, the tension transmission device 104 defines the above predetermined trajectory as a linear trajectory by the tension wheel holding member 16.

In the present embodiment, the tensioning sheave holding member 16 also includes a connecting portion 161 and a supporting portion 162, wherein the connecting portion 161 is a gear rotatably mounted to the fixed base 11, the supporting portion 162 is a rack gear drivingly connected to the gear, and the first tensioning sheave 14 and the second tensioning sheave 15 are rotatably supported on one side end surfaces of the rack gear, respectively. Specifically, the gear as the connecting portion 161 has a mounting hole, which is rotatably mounted outside the extension portion 112 of the fixed base 11 through the mounting hole to be rotatable about the rotation axis of the first rotating member 12. The rack as the supporting portion 162 is slidably provided on the fixed base 11, and keeps the first tension pulley 14 and the second tension pulley 15 at a constant distance from each other, symmetrically holds the first tension pulley 14 and the second tension pulley 15 on both sides of the traction member 60 between the first rotating member 12 and the second rotating member (i.e., the transmission wheel 20), and presses the traction member 60 toward each other.

Since the first tension pulley 14 and the second tension pulley 15 can only reciprocate in the direction perpendicular to the line connecting the first rotating member 12 and the second rotating member under the restriction of the drive-fit between the connecting portion 161 and the supporting portion 162 (i.e., the first tension pulley 14 and the second tension pulley 15 are caused to swing left and right in the direction perpendicular to the line connecting the first rotating member 12 and the second rotating member in the viewing direction shown in fig. 9). Therefore, when the traction members 60 on both sides of the first rotating member 12 are subjected to different pulling forces during the process of driving the second rotating member to rotate by the tension transmission device 104, and the degrees of tightness of both sides of the traction members 60 on both sides of the first rotating member 12 are inconsistent, the first tension pulley 14 and the second tension pulley 15 will synchronously swing along the straight track defined by the tension pulley holding member 16 toward the side of the traction members 60 where the tensile force is larger under the action of the traction members 60. Therefore, the pulling force on the tight side of the traction component 60 can be transmitted to the loose side, so that the purpose of automatically adjusting the stress condition of the traction component 60 is achieved, the local stress concentration of the traction component 60 is avoided, and the problem of tooth skipping or local fracture of the traction component 60 is prevented.

It should be noted that since the distance between the first tension pulley 14 and the second tension pulley 15 is constant, the wrap angle of the traction member 60 can be limited within a certain range by providing the first tension pulley 14 and the second tension pulley 15 on the support portion 162 at a predetermined interval. That is, the distance between the first tensioning wheel 14 and the second tensioning wheel 15 can be set according to the desired wrap angle range of the traction means 60, so that the wrap angle of the traction means 60 can always be limited within a reasonable range by the first tensioning wheel 14 and the second tensioning wheel 15 oscillating synchronously along a linear trajectory during operation of the tensioning drive 104.

Fig. 10 is a schematic view of a state of use of the tension drive 105 according to yet another embodiment of the present invention. For ease of understanding, the same reference numerals are used for the same components in the tension transmission device 105 shown in fig. 10 as in the tension transmission device 102 in the above-described embodiment, and the detailed description of the structure already described will not be repeated. Unlike the tension transmission 102 in the above embodiment, the tension transmission 105 defines the above predetermined trajectory as a linear trajectory by the tension pulley holding member 16.

In the present embodiment, the tension sheave holding member 16 includes the connecting arm 164 and the linear guide groove 166. Specifically, in the present embodiment, the connecting arm 164 has opposite end portions by which the first tension pulley 14 and the second tension pulley 15 are fixedly connected, respectively, so that the first tension pulley 14 and the second tension pulley 15 are positionally fixed relative to each other and symmetrically held outside the traction member 60 between the first rotating member 12 and the transmission wheel 20, and the traction member 60 can be pressed toward each other from both sides.

Illustratively, the linear guide groove 166, which is a guide rail, is configured as a linear slide groove perpendicular to a line connecting between the first rotating member 12 and the second rotating member. Thus, the predetermined trajectory described above can be defined as a linear trajectory in a direction perpendicular to a line connecting the first rotating member 12 and the second rotating member by the linear guide groove 166. And the first tension pulley 14 and the second tension pulley 15 are respectively slidably connected to the linear guide groove 166, so that the first tension pulley 14 and the second tension pulley 15 can synchronously swing along a predetermined linear track under the combined action of the connecting arm 164 and the linear guide groove 166. In addition, as for the connection manner of the first tension pulley 14 and the second tension pulley 15 with the connecting arm 164 and the linear guide groove 166, and the fixing manner of the linear guide groove 166, the description of the relevant parts in the tension transmission device 102 in the above embodiment can be referred to, and the description thereof is omitted.

Since the first tension pulley 14 and the second tension pulley 15 can only reciprocate in the direction perpendicular to the line connecting the first rotating member 12 and the second rotating member (i.e., in the direction of view shown in fig. 10, the first tension pulley 14 and the second tension pulley 15 are swung left and right in the direction perpendicular to the line connecting the first rotating member 12 and the second rotating member) by the engagement of the connecting arm 164 and the linear guide groove 166. Therefore, when the traction members 60 on both sides of the first rotating member 12 are subjected to different pulling forces during the process of driving the second rotating member to rotate by the tension transmission device 104, and the degrees of tightness of both sides of the traction members 60 on both sides of the first rotating member 12 are inconsistent, the first tension pulley 14 and the second tension pulley 15 will synchronously swing along the straight track defined by the tension pulley holding member 16 toward the side of the traction members 60 where the tensile force is larger under the action of the traction members 60. Therefore, the pulling force applied to the tight side of the traction component 60 can be transmitted to the loose side, so that the purpose of automatically adjusting the stress state of the traction component 60 is achieved, the local stress concentration of the traction component 60 is avoided, and the problem of tooth jumping or local fracture of the traction component 60 in the transmission process is solved.

Since the distance between the first tension pulley 14 and the second tension pulley 15 is constant, the wrap angle of the traction member 60 can be limited to a certain range by connecting the first tension pulley 14 and the second tension pulley 15 by the connecting arm 164 having a predetermined length. That is, the length of the connecting arm 164 connected between the first tension pulley 14 and the second tension pulley 15 can be set according to the desired wrap angle range of the traction member 60. Therefore, during the operation of the tension transmission device 104, the wrap angle of the traction element 60 can always be limited within a reasonable range by the first tension pulley 14 and the second tension pulley 15 oscillating synchronously along a predetermined linear trajectory.

The tensioning transmission device 105 of the embodiment can also provide a stroke limiting effect for the first tensioning wheel 14 and the second tensioning wheel 15 through the two ends of the linear guide groove 166, so that the problem that the stress concentration of the traction component 60 and the wrap angle range of the traction component 60 cannot be effectively solved due to the overlarge swing amplitude of the first tensioning wheel 14 and the second tensioning wheel 15 towards a certain direction can be avoided, the service life and the transmission reliability of the traction component 60 can be further prolonged, and the use reliability of the tensioning transmission device 102 can be further improved.

In addition, in the above embodiments, only the manner in which the first rotating member 12, the first tension pulley 14, and the second tension pulley 15 are rotatably provided on the respective support structures by bearings, that is, rotatably provided on the fixed base 11 and the tension pulley holding member 16 by bearings, respectively, is shown, but embodiments of the present invention are not limited thereto. In other embodiments, in order to enable the first rotating member 12, the first tensioning wheel 14 and the second tensioning wheel 15 to be smoothly matched with the traction member 60, the first rotating member 12, the first tensioning wheel 14 and the second tensioning wheel 15 may be fixedly arranged on the corresponding supporting structures, and meanwhile, a member in the form of a sleeve is rotatably sleeved on the outer peripheries of the first rotating member 12, the first tensioning wheel 14 and the second tensioning wheel 15.

In other embodiments, the first tension pulley 14 and the second tension pulley 15 may be held outside the traction member 60 between the first rotating member 12 and the second rotating member by a structure other than the tension pulley holding member 16, and simultaneously press the traction member 60 toward each other, and may swing by the traction member 60, which is not limited to this embodiment of the present invention.

FIG. 11 is a cross-sectional structural schematic view of one particular example of a second rotating component of a pitch system in cooperation with a traction component 60 according to an embodiment of the present invention; FIG. 12 is a cross-sectional structural schematic view of another specific example of a second rotating component in a pitch system in cooperation with a traction component 60 according to an embodiment of the present invention; FIG. 13 is a cross-sectional structural schematic view of yet another specific example of a second rotating component in a pitch system in cooperation with a traction component 60 according to an embodiment of the invention. In addition, in the above description, the case that the second rotating part in the pitch system 1 according to the embodiment of the present invention is the outer ring 31 of the pitch bearing 30 has been described according to fig. 6, and the application of the pitch system according to other embodiments of the present invention will be described below with reference to fig. 11 to 13, and it should be noted that only the structure of the matching portion of the traction member 60 and the second rotating part is shown in fig. 11 to 13.

Referring to FIG. 11, in an alternative embodiment, the second rotating part in the pitch system is the inner ring 32 of the pitch bearing 30. Specifically, when the second rotating component that is driven in cooperation with the traction component 60 (i.e. the toothed belt) is the inner ring 32, then the outer ring 31 of the pitch bearing 30 is fixedly connected to the hub 40, and the inner ring 32 is fixedly connected to the blade root 50. Since the tension transmission device (not shown in the figures) is located outside the blade, the inner ring 32 needs to be engaged with the traction component 60 by providing an annular extension 321 protruding from the outer ring 31 in the axial direction of the pitch bearing 30 and by providing gear teeth 322 on the outer circumferential surface of the annular extension 321. Therefore, the purpose of driving the blades to change the pitch can be achieved through the transmission fit of the traction component 60 and the inner ring 32.

Compared with the mode that the traction component 60 is in transmission fit with the outer ring 31 of the variable pitch bearing 30 to drive the blades to change the pitch, the size of the inner ring 32 can be increased under the condition that the specifications of the blades are the same, so that the pitch diameter of the bolts connected between the variable pitch bearing 30 and the blades and the number of the bolts can be increased, the surrounding area of the traction component 60 on the periphery of the inner ring 32 is increased, the load resistance of the blade root 50 can be improved, the load borne by a single bolt is reduced, the load borne by the variable pitch bearing 30 is reduced, and the use reliability of a variable pitch system can be further improved.

Referring to FIG. 12, in another alternative embodiment, the second rotating component in the pitch system is an annular transition joint section 51 connected to the blade root 50. Specifically, when the second rotating component that is driven in cooperation with the traction component 60 is the transition connection section 51, the outer ring 31 of the pitch bearing 30 is fixedly connected to the hub 40, and the inner ring 32 is fixedly connected to the blade root 50 through the transition connection section 51. Illustratively, the traction component 60 is a toothed belt, and the transition connecting section 51 and the blade are of an integral structure, that is, the gear teeth 501 may be directly provided on the outer peripheral surface of the root of the blade, so as to engage and cooperate with the traction component 60 through the gear teeth 501, thereby achieving the purpose of driving the blade to pitch through the transmission of the traction component 60 and the blade.

The driving blade is driven to execute the variable pitch action in the transmission matching mode, the variable pitch accuracy of the blade can be improved, the gear teeth 501 can be machined while the blade is produced, the complex machining process of arranging the gear teeth on the variable pitch bearing 30 is omitted, the machining difficulty of a variable pitch system is reduced, and meanwhile the cost of the variable pitch system is also reduced.

Referring to fig. 13, in a further alternative embodiment, the second rotating part of the pitch system is also an annular transition piece 51 connected to the blade root 50, but differs from the application shown in fig. 12 in that the transition piece 51 in this embodiment is a split structure from the blade. Similarly, the outer ring 31 of the pitch bearing 30 is fixedly connected to the hub 40, while the inner ring 32 is fixedly connected to the blade root 50 via a transition connection section 51. Illustratively, the traction member 60 is a toothed belt. The outer surface of the transition connecting section 51 is connected with an annular supporting surface 512 through an annular connecting piece 511, and the outer peripheral surface of the supporting surface 512 is provided with gear teeth 513 so as to be meshed and matched with the traction part 60 through the gear teeth 513, so that the traction part 60 and the blades can be matched for transmission, and the purpose of driving the blades to change the pitch is achieved.

The driving blade is driven to perform the variable pitch action through the transmission matching mode, and the surrounding area of the traction part 60 on the periphery of the blade root 50 can be increased, so that the load resistance of the blade root 50 can be improved. Moreover, the transition connecting section 51 can be manufactured into a standard part for mass production, so that the production efficiency of the variable pitch system can be improved, and the manufacturing cost of the variable pitch system can be reduced.

In addition, according to another embodiment of the present invention, a wind turbine generator system is further provided, which includes the pitch system 1 of the above embodiment, and therefore, the wind turbine generator system has the same advantages as the pitch system, and therefore, the detailed description thereof is omitted.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different features that are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims.

Claims

1. A tensioning drive (100, 101, 102, 103, 104, 105), said tensioning drive (100, 101, 102, 103, 104, 105) being driven by a traction member (60) in cooperation with a second rotating member, characterized in that said tensioning drive (100, 101, 102, 103, 104, 105) comprises:

a fixed base (11);

a first rotating member (12) pivotally connected to the fixed base (11); and

a first tension pulley (14) and a second tension pulley (15) which are respectively supported on the outer sides of the traction members (60) between the first rotating member (12) and the second rotating member and simultaneously press the traction members (60) toward each other, and the first tension pulley (14) and the second tension pulley (15) can synchronously swing along a predetermined track under the action of the traction members (60);

a tension pulley holding member (16) for holding a constant distance between the first tension pulley (14) and the second tension pulley (15), the tension pulley holding member (16) including a connecting portion (161) and a supporting portion (162), the connecting portion (161) being rotatably connected to the fixing base (11),

the support portion (162) is connected to the connecting portion (161) and the first tension pulley (14) and the second tension pulley (15), and is rotated around the rotation axis of the first rotating member (12) by the connecting portion (161) to define the predetermined trajectory as an arc trajectory centered on the rotation axis of the first rotating member (12), or,

the support portion (162) is connected to the connecting portion (161) and the first tension pulley (14) and the second tension pulley (15), and is reciprocated by the support portion (162) in a direction perpendicular to a line connecting the first rotating member (12) and the second rotating member to define the predetermined trajectory as a linear trajectory in the direction perpendicular to the line connecting the first rotating member (12) and the second rotating member.

2. The tension drive (100, 101, 102, 103, 104, 105) according to claim 1, wherein the fixed base (11) comprises:

a fixed portion (111) fixed to the external support structure by a connector; and

an extension part (112) protrudingly provided on the fixing part (111) and having a first accommodation space receiving the first rotating member (12).

3. The tensioning drive (100, 101, 102, 103, 104, 105) according to claim 1, characterized in that the support portion (162) comprises a second housing space (162 c) communicating with the first rotation part (12), the first tensioning wheel (14) and the second tensioning wheel (15) being supported in the second housing space (162 c) so as to form a passing space through which the traction part (60) can pass between the first rotation part (12), the first tensioning wheel (14) and the second tensioning wheel (15) through the second housing space (162 c).

4. The tensioning drive (100, 101, 102, 103, 104, 105) according to claim 3, characterized in that the support portion (162) comprises two plates arranged opposite and parallel to each other, between which the second accommodation space (162 c) is formed, and on which the first tensioning wheel (14) and the second tensioning wheel (15) are rotatably supported, respectively.

5. The tensioning drive (100, 101, 102, 103, 104, 105) according to claim 1, further comprising a limiting means cooperating with the tensioning wheel retaining means (16) to limit the maximum oscillation amplitude of the first tensioning wheel (14) and/or the second tensioning wheel (15).

6. The tensioning drive (100, 101, 102, 103, 104, 105) according to claim 1, characterized in that it further comprises a damping member (17), said damping member (17) being hingedly connected between said first tensioning wheel (14) and a fixed structure and/or between said second tensioning wheel (15) and said fixed structure to limit the vibration frequency of the corresponding first tensioning wheel (14) and/or second tensioning wheel (15) by said damping member (17).

7. A tensioning drive (100, 101, 102, 103, 104, 105), said tensioning drive (100, 101, 102, 103, 104, 105) being driven by a traction member (60) in cooperation with a second rotating member, characterized in that said tensioning drive (100, 101, 102, 103, 104, 105) comprises:

a fixed base (11);

a first rotating member (12) pivotally connected to the fixed base (11); and

a tension pulley holding member (16) including a connecting arm (164) and a guide rail, the connecting arm (164) fixedly connecting the first tension pulley (14) and the second tension pulley (15) by opposite ends thereof, respectively, the guide rail defining the predetermined trajectory as an arc trajectory centering on a rotation axis of the first rotating member (12) or a straight trajectory along a direction perpendicular to a line connecting the first rotating member (12) and the second rotating member, and the first tension pulley (14) and the second tension pulley (15) being slidably connected to the guide rail.

8. The tensioning drive (100, 101, 102, 103, 104, 105) according to claim 7, further comprising a limiting means cooperating with the tensioning wheel retaining means (16) to limit the maximum oscillation amplitude of the first tensioning wheel (14) and/or the second tensioning wheel (15).

9. The tensioning drive (100, 101, 102, 103, 104, 105) according to claim 7, further comprising a damping member (17), said damping member (17) being hingedly connected between said first tensioning wheel (14) and a fixed structure and/or between said second tensioning wheel (15) and said fixed structure to limit the vibration frequency of the corresponding first tensioning wheel (14) and/or said second tensioning wheel (15) by said damping member (17).

10. A pitch system (1) for driving a blade of a wind power plant to pitch, the blade being rotatably connected to a hub of the wind power plant by a pitch bearing (30), characterized in that the pitch system (1) comprises:

a drive motor;

the tensioning drive (100, 101, 102, 103, 104, 105) as set forth in any one of claims 1-9, wherein said first rotational member (12) is connected with said drive motor;

a second rotating member connected with a blade root (50); and

the traction component (60) surrounds the first rotating component (12) and the second rotating component, and is in matched transmission with the first rotating component (12) and the second rotating component respectively.

11. A pitch system (1) according to claim 10, wherein said stationary base (11) is connected to said hub (40).

12. A pitch system (1) according to claim 10, wherein said traction member (60) is a toothed belt.

13. A pitch system (1) according to any of claims 10-12, wherein said second rotating part is an outer ring (31) of the pitch bearing (30) connected to the blade root (50), said traction member (60) co-operating in rotation with said outer ring (31).

14. A pitch system (1) according to any of claims 10 to 12, wherein the second rotational part is an inner ring (32) of the pitch bearing (30) connected to the blade root (50), the inner ring (32) comprising an annular extension (321) protruding from an outer ring (31) of the pitch bearing (30) in the axial direction of the pitch bearing (30), the traction part (60) being co-operable with the inner ring (32) for rotation via the annular extension (321).

15. A pitch system (1) according to any of claims 10-12, wherein said second rotating part is an annular transition joint section (51) connected to said blade root (50), said traction member (60) co-operating in rotation with said blade through said transition joint section (51).

16. A pitch system (1) according to claim 15, wherein said transition joint section (51) is of unitary construction with said blade.

17. A pitch system (1) according to claim 15, wherein the outer circumference of the transition joint section (51) is provided radially convexly with an annular support surface (512), the traction member (60) being adapted to rotate with the blade via the support surface (512).

18. A wind park according to any of claims 10-17, comprising a pitch system (1).