Connecting device for connecting gear box and main shaft

Abstract

The utility model discloses a connecting device for connecting a gear box and a main shaft, which is applied to the field of fan transmission and comprises a first flange, a second flange, a third flange and a fourth flange, the second flange is connected with the other one of the main shaft or the gear box, a second connecting hole is formed in the second flange, and an inner threaded hole is formed in the side, away from the first connecting hole, of the second connecting hole; the hollow pin column penetrates through the first connecting hole and partially extends into the second connecting hole; and the fastening assembly comprises a screw rod and a fastening piece, the screw rod penetrates through the first connecting hole and the second connecting hole and then is connected with the inner threaded hole, and the fastening piece is connected with the end, away from the second flange, of the screw rod so that the first flange can be tightly pressed on the second flange. According to the connecting device disclosed by the utility model, the torque transmission capability and the safety can be effectively improved, or the sizes of the first flange and the second flange can be reduced on the premise of meeting the same torque transmission capability and safety, so that the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of wind power transmission equipment, in particular to a connecting device for connecting a gear box and a main shaft. Background Art

[0002] At present, there are generally two ways to connect the wind turbine main shaft with the transmission shaft and wind turbine gearbox of a wind turbine generator set. The connection of the wind turbine main shaft is to use a locking plate with an inner ring and an outer ring for sleeve connection, and the wind turbine main shaft is locked by a keyless connection and fixed by a locking screw; the other structure does not use a locking plate, but uses a flange connection, that is, the output shaft of the wind turbine main shaft and the gearbox are each connected to a large flange, and the two flanges are connected with screws for transmission; in the connection method of the wind turbine main shaft and the gearbox, a locking plate connection or a flange connection is generally used; at the same time, the friction between the two flanges is increased by applying abrasive paint on the surface of the main shaft flange.

[0003] However, in the prior art, a large flange is connected to the main shaft of the fan and the output shaft of the gearbox respectively, and then the two flanges are fixed by screws. When the working load is large, the size of the main shaft flange is limited, and the screws cannot be arranged infinitely, this structural form cannot fully bear the torque transmission; at the same time, the method of applying friction-increasing paint on the surface of the main shaft flange has a limited improvement in the friction coefficient, and the friction coefficient of the friction-increasing paint will be reduced after being immersed in lubricating oil, and the end face of the flange may slip, thereby affecting the torque transmission; in addition, in the prior art, since the screws and pins are assembled separately, when the installation area is limited, it is impossible to install a sufficient number of screws and pins to bear the load.

[0004] Therefore, how to improve the torque transmission capacity while ensuring the connection reliability between the gear box and the main shaft is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] The utility model aims to provide a connecting device for connecting a gear box and a main shaft, which can ensure the efficiency of torque transmission when the size of the main shaft flange is limited.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A connecting device for connecting a gear box and a main shaft, comprising:

[0008] A first flange connected to one of the main shaft or the gear box, wherein the first flange is provided with a first connecting hole;

[0009] a second flange connected to the main shaft or the other of the gearbox, the second flange being provided with a second connecting hole, and the second connecting hole being provided with an internal threaded hole on a side away from the first connecting hole;

[0010] A hollow pin, which passes through the first connecting hole and partially penetrates into the second connecting hole;

[0011] The fastening assembly includes a screw and a fastener. The screw passes through the first connecting hole and the second connecting hole and is connected to the internal threaded hole. The fastener is connected to one end of the screw away from the second flange to press the first flange onto the second flange.

[0012] On the other hand, a pin step is provided on the outer periphery of the first end of the hollow pin, and the pin step is snap-fitted with the end surface of the first connecting hole.

[0013] On the other hand, the first connection hole includes a first pin connection hole and a first fastening connection hole, and the second connection hole includes a second pin connection hole and a second fastening connection hole;

[0014] The sizes of the first pin connection hole and the second pin connection hole are adapted to the size of the hollow pin, and the sizes of the first fastening connection hole and the second fastening connection hole are adapted to the size of the screw.

[0015] On the other hand, it also includes an annular heightening pad, which abuts against the end face of the first fastening connection hole; and the height of the heightening pad is equal to the distance between the pin step and the first end face of the hollow pin.

[0016] On the other hand, a connection hole step is provided between the second connection hole and the internal threaded hole, and the second end surface of the hollow pin abuts against the connection hole step.

[0017] On the other hand, the fastening assembly further includes a gasket, which is located between the fastener and the hollow pin.

[0018] On the other hand, the fastener is a nut, the gasket is an annular gasket, the outer diameter of the gasket is greater than or equal to the outer diameter of the hollow pin, and the inner diameter is adapted to the size of the screw.

[0019] On the other hand, it also includes an annular friction plate disposed between the first flange and the second flange;

[0020] The friction plate includes a plurality of friction plate monomers, each of which is provided with a positioning hole, a pin through hole and a screw through hole. The positioning hole is connected to the positioning protrusion on the second flange, the pin through hole is for the hollow pin to pass through, and the screw through hole is for the screw to pass through.

[0021] On the other hand, the positioning holes, the pin through holes and the screw through holes are evenly distributed along the circumference of the friction plate; and the structures of the friction plate monomers are the same.

[0022] On the other hand, at least one positioning hole is respectively provided on both radial sides of the friction plate monomer, and the positioning hole is a spline slot hole.

[0023] The connecting device for connecting a gear box and a main shaft provided by the utility model realizes connection between the two with the main shaft and the gear box respectively through the setting of the first flange and the second flange; utilizes the setting of the hollow pin to realize torque transmission between the first flange and the second flange, and realizes a firm connection between the first flange and the second flange through the fastening assembly; in the present application, through the hollow design of the hollow pin, and then the screw in the fastening assembly is passed through the hollow pin, the hollow pin and the fastening assembly can be assembled at the same position, and at the same time, the internal threaded hole extending in the second connecting hole and the cooperation of the fastener are utilized to complete the fastening of the two ends of the screw. Under the size limit of the first flange and the second flange, the connecting device can effectively improve the torque transmission capacity and safety, or under the premise of meeting the same torque transmission capacity and safety, the size of the first flange and the second flange can be reduced, thereby reducing the cost.

[0024] The utility model provides a connecting device for connecting a gear box and a main shaft, wherein the hollow portion in the hollow pin is a through hole, and the screw rod passes through the end portion of the hollow pin rod and enters into the hollow portion of the hollow pin rod. The matching connection form of the screw rod and the hollow pin rod can maximize the space utilization rate, increase the number of screw rods installed in a limited space, increase the clamping force between the end faces of the first flange and the second flange, and improve the ability of the screw rod to resist the rated load, while meeting the torque transmission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a specific implementation of a connecting device for connecting a gear box and a main shaft provided by the utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the connection structure of the first pin connection hole and the first fastening connection hole in the connection device shown;

[0028] Figure 3 for Figure 1 A schematic diagram of the connection structure of the second pin connection hole and the second fastening connection hole in the connection device shown;

[0029] Figure 4 This is a schematic diagram of the structure of the friction plate in the connecting device provided by the utility model;

[0030] Figure 5 for Figure 4 Schematic diagram of the structure of the friction plate monomer in the friction plate shown.

[0031] Reference numerals:

[0032] First flange 1; second flange 2; internal threaded hole 21; connecting hole step 22; hollow pin 3; pin step 31; fastening assembly 4; screw 41; fastener 42; gasket 43; heightening pad 5; friction plate 6; friction plate monomer 61; positioning hole 611; pin through hole 612; screw through hole 613. DETAILED DESCRIPTION

[0033] The core of the utility model is to provide a connecting device for connecting a gear box and a main shaft, which can effectively improve the torque transmission capacity between the main shaft and the gear box.

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In this embodiment, if Figure 1 As shown, the connecting device for connecting the gear box and the main shaft includes:

[0036] A first flange 1 is connected to one of the main shaft or the gear box, and a first connecting hole is provided on the first flange 1;

[0037] A second flange 2 is connected to the other of the main shaft or the gear box. A second connecting hole is provided on the second flange 2. An internal threaded hole 21 is provided on a side of the second connecting hole away from the first connecting hole.

[0038] A hollow pin 3 is arranged to pass through the first connecting hole and partially penetrate into the second connecting hole;

[0039] The fastening assembly 4 includes a screw 41 and a fastener 42. The screw 41 passes through the first connecting hole and the second connecting hole and is connected to the internal threaded hole 21. The fastener 42 is connected to one end of the screw 41 away from the second flange 2 to press the first flange 1 onto the second flange 2.

[0040] Specifically, taking the first flange 1 connected to the main shaft and the second flange 2 connected to the planetary carrier end face of the gear box as an example, the hollow pin 3 is cylindrical, and the screw 41 passes through the hollow part of the hollow pin 3. The installation of the hollow pin 3 and the screw 41 is from the first connecting hole of the first flange 1, and then penetrates and is installed in the second connecting hole of the second flange 2. After the hollow pin 3 passes through the first connecting hole, part of the structure enters the second connecting hole, and part of the structure of the hollow pin 3 on the side away from the second flange 2 is retained outside the first connecting hole, which is used for limiting cooperation with the first connecting hole; similarly, after the screw 41 passes through the first connecting hole, part of the structure enters the second connecting hole, and part of the structure of the screw 41 on the side away from the second flange 2 is retained outside the first connecting hole, which is used for cooperation and connection with the fastener 42. Furthermore, the size of the hollow part of the hollow pin 3 is adapted to the size of the screw 41, and the gap between the inner wall of the hollow pin 3 and the screw 41 is not easy to be too large, which will affect the connection strength and torque transmission capacity; under the premise of meeting the assembly requirements, the inner wall of the hollow pin 3 and the screw 41 are fitted together, which can not only increase the strength of the hollow pin 3 and meet the torque transmission capacity, but also make the fixation of the screw 41 and the fastener 42 more secure and the connection strength is high.

[0041] Furthermore, a threaded connection portion is provided at the end of the screw rod 41, and the threaded connection portion is cooperatively connected with the internal threaded hole 21. The diameter of the threaded connection portion is smaller than the diameter of the main part of the screw rod 41, so that when the screw rod 41 is assembled with the internal threaded hole 21, a stop is formed between the threaded connection portion and the main part of the screw rod 41, which facilitates the limiting of the screw rod 41.

[0042] The connecting device realizes the connection of the first flange 1 and the second flange 2 with the main shaft and the gear box respectively through the setting of the first flange 1 and the second flange 2; realizes the torque transmission between the first flange 1 and the second flange 2 by utilizing the setting of the hollow pin 3, and realizes the firm connection between the first flange 1 and the second flange 2 by utilizing the fastening assembly 4; in the present application, through the hollow design of the hollow pin 3, and then the screw 41 in the fastening assembly 4 is passed through the hollow pin 3, the hollow pin 3 and the fastening assembly 4 can be assembled at the same position, and at the same time, the two ends of the screw 41 are fastened by utilizing the internal threaded hole 21 extending from the second connecting hole and the cooperation of the fastener 42. Under the size limit of the first flange 1 and the second flange 2, the connecting device can effectively improve the torque transmission capacity and safety, or under the premise of meeting the same torque transmission capacity and safety, the size of the first flange 1 and the second flange 2 can be reduced, thereby reducing the cost.

[0043] The connecting device for connecting a gear box and a main shaft provided by the utility model has a hollow portion in the hollow pin 3 as a through hole, and a screw rod 41 passes through the end portion of the hollow pin 3 and enters into the hollow portion of the hollow pin 3. The matching connection form of the screw rod 41 and the hollow pin 3 can maximize the space utilization, increase the number of screw rods 41 installed in a limited space, increase the clamping force between the end faces of the first flange 1 and the second flange 2, and improve the ability of the screw rod 41 to resist the rated load, while meeting the torque transmission requirements.

[0044] In some embodiments, Figure 2 The outer periphery of the first end of the hollow pin 3 is provided with a pin step 31, and the pin step 31 is engaged with the end surface of the first connecting hole. Specifically, the setting of the pin step 31 can limit the position of the pin step 31 and the end surface of the first connecting hole, ensuring the position of the pin step 31 is stable.

[0045] In some embodiments, Figure 2 As shown, the first connection hole includes a first pin connection hole and a first fastening connection hole; Figure 3 As shown, the second connecting hole includes a second pin connecting hole and a second fastening connecting hole; specifically, two types of connecting holes are provided on the first flange 1 and the second flange 2, one is for installing a hollow pin 3 and a screw 41, which plays a connecting + torque transmission role, and the other is for installing only the screw 41, which plays a connecting role; further, the size of the first pin connecting hole and the second pin connecting hole is adapted to the size of the hollow pin 3, and the size of the first fastening connecting hole and the second fastening connecting hole is adapted to the size of the screw 41, and the allocation of the first pin connecting hole and the second pin connecting hole and the first pin connecting hole and the second pin connecting hole can be set as needed.

[0046] In some embodiments, Figure 3 , and also includes an annular heightening pad 5, which abuts against the end face of the first fastening connection hole; and the height of the heightening pad 5 is equal to the distance between the pin step 31 and the first end face of the hollow pin 3; the purpose of the heightening pad 5 is to unify the length specifications of the screw 41, to prevent the length difference between the screws 41 from interfering when using a torque wrench or a tensioner, and to improve the installation efficiency.

[0047] In some embodiments, a connection hole step 22 is provided between the second connection hole and the internal threaded hole 21, and the second end surface of the hollow pin 3 abuts against the connection hole step 22. Specifically, the setting of the connection hole step 22 can limit the relative position of the hollow pin 3 and the second flange 2, further ensuring the position stability and installation accuracy of the hollow pin 3.

[0048] In some embodiments, the fastening assembly 4 further includes a gasket 43, which is located between the fastener 42 and the hollow pin 3. The provision of the gasket 43 can increase the tightening force of the fastener 42 and ensure the connection strength.

[0049] In some embodiments, the fastener 42 is a nut, the washer 43 is an annular washer 43, the outer diameter of the washer 43 is greater than or equal to the outer diameter of the hollow pin 3, and the inner diameter is adapted to the size of the screw 41. Preferably, the outer diameter of the washer 43 is equal to the outer diameter of the hollow pin 3, ensuring that the washer 43 is flush with the outer circumference of the hollow pin 3, and the inner diameter of the washer 43 is slightly larger than the diameter of the screw 41 to ensure connection stability.

[0050] In some embodiments, Figure 4 and Figure 5 , and also includes an annular friction plate 6, which is arranged between the first flange 1 and the second flange 2; the friction plate 6 includes a plurality of friction plate monomers 61, each of which is provided with a positioning hole 611, a pin through hole 612 and a screw through hole 613, the positioning hole 611 is connected to the positioning protrusion on the second flange 2, the pin through hole 612 is for the hollow pin 3 to pass through, and the screw through hole 613 is for the screw 41 to pass through. Preferably, the friction plate 6 is a diamond friction plate 6, which has high strength and long service life and can improve the friction coefficient between the end face of the first flange 1 and the end face of the second flange 2; specifically, in order to control the cost of the unit, the size of the bearing is limited, resulting in the area of ​​the first flange 1 connected to the main shaft being limited. When the unit load is large, the screw 41 connected between the first flange 1 of the main shaft and the second flange 2 of the gear box planetary frame cannot withstand the limit load and needs to bear the torque through the pin, but the pin or pin column often cannot withstand a large load. In order to avoid sliding of the end face between the first flange 1 and the second flange 2, a friction plate 6 is added. The purpose of the friction plate 6 is to increase the friction coefficient between the two contact surfaces of the first flange 1 and the second flange 2, reduce the risk of slippage between the two contact surfaces, and facilitate the power generated by the wind wheel to be better transmitted to the input end of the gear box through the main shaft, thereby improving the torque transmission and shear resistance.

[0051] Furthermore, the positioning hole 611 is connected to the positioning protrusion on the second flange 2 to facilitate the installation of the friction plate monomers 61 one by one. After each friction plate monomer 61 is assembled, it forms a whole ring. The pin through hole 612 corresponds to the position of the first pin connecting hole and the second pin connecting hole, and the screw through hole 613 corresponds to the position of the first fastening connecting hole and the second fastening connecting hole.

[0052] Furthermore, since the friction plate 6 is relatively expensive, the use of a segmented friction plate monomer 61 can reduce production costs and facilitate equivalent modeling in laboratory tests of actual friction coefficients; the number of positioning holes 611, pin through holes 612 and screw through holes 613 contained in each friction plate monomer 61 corresponds to the same and is evenly distributed.

[0053] In some embodiments, the positioning holes 611, the pin through holes 612, and the screw through holes 613 are evenly distributed along the circumference of the friction plate 6; and the structures of the friction plate monomers 61 are the same, which is convenient for processing. Specifically, compared with the prior art, in which the end face of the main shaft flange is directly connected to the end face of the gearbox planetary carrier, and the friction coefficient is increased only by applying friction-increasing paint, the friction plate 6 can increase the friction coefficient by a larger amplitude, and once the friction-increasing paint penetrates into the lubricating oil inside the transmission system, it will greatly reduce the friction coefficient and directly affect the torque transmission effect of the transmission system, while the friction plate 6 will not be affected much after being immersed in oil.

[0054] In some embodiments, at least one positioning hole 611 is respectively disposed on both radial sides of the friction plate monomer 61 , and the positioning hole 611 is a spline slot hole, so as to ensure that the friction plate monomer 61 is more firmly disposed on the second flange 2 .

[0055] In a specific embodiment, the first flange 1 and the second flange 2 on the main shaft and the planetary carrier of the gearbox are combined in the form of screw 41 + hollow pin 3 + friction plate 6. First, a plurality of friction plate monomers 61 are installed on the end face of the second flange 2, and then docked with the end face of the first flange 1; then the hollow pin 3 is passed through the first connecting hole of the first flange 1 and inserted into the second connecting hole of the first flange 1. The second connecting hole is a countersunk hole. After the hollow pin 3 is completely installed, a part of the structure of the screw 41 is passed through the hollow part of the hollow pin 3 and inserted into the internal threaded hole 21 extending from the bottom of the second connecting hole; a gasket 43 is placed on the hollow pin 3 for nut tightening; a heightening pad 5 is used in the part where the hollow pin 3 is not used to keep the installation surface of all nuts at a uniform horizontal plane, and the gasket 43 is placed above the heightening pad 5 for nut tightening. A tensioner or a hydraulic wrench can be used to tighten the nuts.

[0056] For large megawatt wind turbines, the connection form using screw 41 + hollow pin 3 + friction plate 6 can improve the torque transmission capacity and safety of the transmission system under high load conditions compared to the connection form using only screw 41, so that it is not limited by the size of the main shaft flange position and the size of the bearing, thereby reducing the cost of the main shaft and bearings.

[0057] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above is a detailed introduction to the connecting device for connecting the gear box and the main shaft provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A connecting device for connecting a gear box and a main shaft, characterized in that: include: A first flange (1) connected to one of the main shaft or the gear box, wherein the first flange (1) is provided with a first connecting hole; A second flange (2) connected to the main shaft or the other of the gearboxes, the second flange (2) being provided with a second connection hole, and a side of the second connection hole facing away from the first connection hole being provided with an internal threaded hole (21); A hollow pin (3) is arranged to pass through the first connecting hole and partially penetrate into the second connecting hole; A fastening assembly (4) comprises a screw rod (41) and a fastener (42); the screw rod (41) passes through the first connecting hole and the second connecting hole and is connected to the internal threaded hole (21); the fastener (42) is connected to an end of the screw rod (41) facing away from the second flange (2) so as to press the first flange (1) onto the second flange (2).

2. The connecting device for connecting a gear box and a main shaft according to claim 1, characterized in that: A pin step (31) is provided on the outer periphery of the first end of the hollow pin (3), and the pin step (31) is snap-fitted with the end surface of the first connecting hole.

3. The connecting device for connecting a gear box and a main shaft according to claim 2, characterized in that: The first connection hole includes a first pin connection hole and a first fastening connection hole, and the second connection hole includes a second pin connection hole and a second fastening connection hole; The sizes of the first pin connection hole and the second pin connection hole are adapted to the sizes of the hollow pin (3), and the sizes of the first fastening connection hole and the second fastening connection hole are adapted to the sizes of the screw rod (41).

4. The connecting device for connecting a gear box and a main shaft according to claim 3, characterized in that: It also includes an annular heightening pad (5), which abuts against the end surface of the first fastening connection hole; and the height of the heightening pad (5) is equal to the distance between the pin column step (31) and the first end surface of the hollow pin column (3).

5. The connecting device for connecting a gear box and a main shaft according to claim 2, characterized in that: A connecting hole step (22) is provided between the second connecting hole and the internal threaded hole (21), and the second end surface of the hollow pin (3) abuts against the connecting hole step (22).

6. The connecting device for connecting a gear box and a main shaft according to claim 1, characterized in that: The fastening assembly (4) further comprises a gasket (43), wherein the gasket (43) is located between the fastener (42) and the hollow pin (3).

7. The connecting device for connecting a gear box and a main shaft according to claim 6, characterized in that: The fastener (42) is a nut, the gasket (43) is an annular gasket (43), the outer diameter of the gasket (43) is greater than or equal to the outer diameter of the hollow pin (3), and the inner diameter is adapted to the size of the screw (41).

8. The connecting device for connecting a gear box and a main shaft according to any one of claims 1 to 7, characterized in that: It also includes an annular friction plate (6) arranged between the first flange (1) and the second flange (2); The friction plate (6) includes a plurality of friction plate monomers (61), each of which is provided with a positioning hole (611), a pin through hole (612) and a screw through hole (613). The positioning hole (611) is connected to the positioning protrusion on the second flange (2), the pin through hole (612) is for the hollow pin (3) to pass through, and the screw through hole (613) is for the screw (41) to pass through.

9. The connecting device for connecting a gear box and a main shaft according to claim 8, characterized in that: The positioning holes (611), the pin through holes (612) and the screw through holes (613) are evenly distributed along the circumference of the friction plate (6); and the structures of the friction plate monomers (61) are the same.

10. The connecting device for connecting a gear box and a main shaft according to claim 8, characterized in that: At least one positioning hole (611) is respectively provided on two radial sides of the friction plate monomer (61), and the positioning hole (611) is a spline slot hole.

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