Box structure and gear box for wind turbine

Abstract

The box structure comprises a shell assembly, an input end cover, and an input shaft. The shell assembly is formed with a mounting space, a matching hole, and a mounting hole. The mounting hole is located between the matching hole and the mounting space. An internal thread is formed on a hole wall of the matching hole. The input end cover is formed with an input shaft hole and an external thread. The external thread is matched with the internal thread. The input end cover is inserted into the matching hole. The input end cover is threadedly connected with the shell assembly. The input shaft hole is communicated with the mounting space through the mounting hole. The internal thread and the external thread are sealing threads. The matching hole, the mounting hole, and the input shaft hole are coaxially arranged. The hole diameter of the mounting hole is greater than the hole diameter of the input shaft hole and less than the hole diameter of the matching hole.

Description

Technical Field

[0001] This disclosure relates to the field of wind power generation equipment technology, and in particular to a housing structure and gearbox. Background Technology

[0002] The gearbox of a wind turbine generator set is one of the mechanical components in the transmission system of the wind turbine generator set. The gearbox is mainly used to transmit the power of the wind turbine to the generator and enable the generator to achieve the corresponding speed. Since the speed generated by the wind turbine under the action of wind is usually low, in order to ensure the power generation efficiency of the generator, the aforementioned gearbox is usually a speed increaser.

[0003] However, in practical applications, it has been found that oil leakage is prone to occur at the input end cover of the wind turbine generator gearbox, resulting in the loss of lubricating oil inside the gearbox. This not only increases the risk of damage to the transmission components inside the gearbox, but also makes it difficult to ensure the stable operation of the wind turbine generator. Utility Model Content

[0004] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] In view of the above, a box structure is provided according to a first aspect of the present disclosure, comprising: The housing assembly has an installation space, a mating hole, and a mounting hole. The mounting hole is located between the mating hole and the installation space, and the wall of the mating hole has an internal thread. The input end cover has an input shaft hole and an external thread, the external thread is adapted to the internal thread, the input end cover is inserted into the mating hole, and the input end cover is threadedly connected to the housing assembly. The input shaft hole is connected to the installation space through the mounting hole. Both the internal and external threads are sealing threads. The mating hole, mounting hole, and input shaft hole are arranged coaxially. The diameter of the mounting hole is larger than the diameter of the input shaft hole but smaller than the diameter of the mating hole.

[0006] In one feasible implementation, the two ends of the input end cover in the axial direction of the input shaft hole are a first end cover and a second end cover, respectively. The first end cover is located in the mounting hole, and the outer edge of the first end cover has a chamfered structure. An oil collecting hole is provided on the chamfered structure. The input end cover also has an oil collecting cavity, and the oil collecting hole is connected between the oil collecting cavity and the mounting hole.

[0007] In one feasible implementation, the enclosure structure further includes: The return oil pipe connects the input end cover and the housing assembly, and the oil collection chamber is connected to the installation space through the return oil pipe.

[0008] In one feasible embodiment, the housing assembly includes a housing body and a mounting ring, the inner peripheral wall of the mounting ring defining a mating hole and a mounting hole, the mating hole and the mounting hole being located at a first ring end and a second ring end of the mounting ring, respectively. The input end cover includes an inner ring and an outer ring. The inner ring has an annular structure, and the inner peripheral wall of the inner ring defines the input shaft hole. An external thread is formed on the outer peripheral wall of the inner ring. The outer ring has an annular structure and is fitted onto the outer peripheral wall of the inner ring. The outer ring covers the end of the first ring.

[0009] In one feasible implementation, the enclosure structure further includes: The first sealing ring is disposed between the outer ring and the first ring end.

[0010] In one feasible embodiment, an annular protrusion structure is formed at one end of the outer ring portion facing the first ring end, and an annular groove is provided at the first ring end. The shape of the annular protrusion structure is adapted to the shape of the annular groove, and the annular protrusion structure is embedded in the annular groove.

[0011] In one feasible implementation, the mounting ring has a first mating wall located between the mating hole and the mounting hole, and the inner ring also has a second mating wall arranged facing the first mating wall. The housing structure also includes a second sealing ring disposed between the first mating wall and the second mating wall.

[0012] In one feasible implementation, the enclosure structure further includes: A sliding seal ring is installed on the wall of the input shaft hole, and the inner circumferential wall of the sliding seal ring is used to slide and seal with the outer circumferential wall of the drive shaft.

[0013] In one feasible implementation, the enclosure structure further includes: The operating lever is located on the input end cover.

[0014] A gearbox for wind turbines is provided according to a second aspect of the present disclosure, comprising: The box structure proposed in any of the first aspects above.

[0015] The above description is merely an overview of the technical solution provided in this disclosure. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other features and effects of this disclosure more obvious and understandable, the following are specific examples of the implementation methods of this disclosure. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1This is a schematic structural diagram of a box structure according to an embodiment of the present disclosure; Figure 2 for Figure 1 A schematic partial cross-sectional view of the box structure is shown in the figure; Figure 3 for Figure 2 A schematic enlarged view of a portion of region A in the middle; Figure 4 A schematic structural diagram of an input end cap according to an embodiment of this disclosure; Figure 5 This is a schematic diagram illustrating a usage scenario of a box structure according to an embodiment of the present disclosure; Figure 6 for Figure 5 A schematic enlarged view of a portion of region B in the middle.

[0017] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100. Housing structure; 200. Drive shaft; 110. Housing assembly; 111. Housing body; 111a. Upper housing; 111b. Lower housing; 112. Mounting ring; 112a. Upper arc plate; 112b. Lower arc plate; 120. Input end cover; 121. Inner ring; 122. Outer ring; 130. Oil return pipe; 140. First sealing ring; 150. Second sealing ring; 160. Sliding sealing ring; 170. Operating lever; 1101. Installation space; 1102. Mating hole; 1103. Mounting hole; 1104. Internal thread; 1121. First ring end; 1122. Second ring end; 1123. Annular groove; 1124. First mating wall; 1201, Input shaft hole; 1202, External thread; 1203, First cap end; 1204, Second cap end; 1205, Chamfered structure; 1206, Oil collection hole; 1207, Oil collection cavity; 1211, Second mating wall; 1221, Annular protrusion structure. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] It should be noted that the gearbox of a wind turbine generator set is one of the mechanical components in the transmission system of the wind turbine generator set. The gearbox is mainly used to transmit the power of the wind turbine to the generator and enable the generator to achieve the corresponding speed. Since the speed generated by the wind turbine under the action of wind is usually low, in order to ensure the power generation efficiency of the generator, the aforementioned gearbox is usually a speed increaser.

[0020] In related technologies, wind turbine gearboxes typically include a gearbox body, an input end cover, a drive shaft, a gear mechanism, and an output shaft. The input end cover is mounted on the gearbox body, the drive shaft passes through the input end cover, and the gear mechanism is connected between the drive shaft and the output shaft. The drive shaft is used to transmit the power of the wind turbine to the output shaft through the gear mechanism, and the output shaft is used to connect the generator to drive the generator to generate electricity.

[0021] However, in practical applications, it has been found that since the input end cover and the gearbox body of wind turbine generator sets are mostly fixedly connected by fasteners, and the fitting clearance between the input end cover and the gearbox body is usually large in order to facilitate disassembly and assembly, oil leakage is likely to occur at the fitting clearance between the input end cover and the gearbox body, resulting in the loss of lubricating oil inside the gearbox. This not only increases the risk of damage to the transmission components inside the gearbox, but also makes it difficult to ensure the stable operation of the wind turbine generator set.

[0022] In view of this, such as Figures 1 to 6 As shown, a box structure 100 is provided according to a first aspect of the present disclosure, including: a housing assembly 110 having a mounting space 1101, a mating hole 1102, and a mounting hole 1103, the mounting hole 1103 being located between the mating hole 1102 and the mounting space 1101, and an internal thread 1104 being formed on the wall of the mating hole 1102; and an input end cover 120 having an input shaft hole 1201 and an external thread 1202, the external thread 1202 being connected to the internal thread 1104. The input end cap 120 is inserted into the mating hole 1102 and is threadedly connected to the housing assembly 110. The input shaft hole 1201 is connected to the installation space 1101 through the mounting hole 1103. The internal thread 1104 and the external thread 1202 are both sealing threads. The mating hole 1102, the mounting hole 1103 and the input shaft hole 1201 are arranged coaxially. The diameter of the mounting hole 1103 is larger than the diameter of the input shaft hole 1201 and smaller than the diameter of the mating hole 1102.

[0023] The housing structure 100 provided in this embodiment includes the aforementioned housing assembly 110 and input end cover 120. The housing assembly 110 has a mounting space 1101, a mating hole 1102, and a mounting hole 1103. The mounting space 1101 is used to accommodate a gear mechanism and lubricating oil for lubricating the gear mechanism. The wall of the mating hole 1102 and the input end cover 120 are respectively formed with an internal thread 1104 and an external thread 1202, which are compatible. The input end cover 120 is inserted into the mating hole 1102 and fastened to the housing assembly 1103 by a threaded connection. 10. Thus, the input end cover 120 and the housing assembly 110 can be directly fastened together, which helps to reduce the amount of fasteners used. The input end cover 120 also forms an input shaft hole 1201. The mating hole 1102, the mounting hole 1103 and the input shaft hole 1201 are arranged coaxially, and the mounting hole 1103 is located between the mating hole 1102 and the mounting space 1101. The input shaft hole 1201 and the mounting space 1101 are connected through the mounting hole 1103. In practical applications, the input shaft hole 1201 can be used to pass through the drive. Shaft 200, correspondingly, the drive shaft 200 can pass through the input shaft hole 1201 and the mounting hole 1103 and be connected to the gear mechanism in the mounting space 1101 for power transmission between the drive shaft 200 and the gear set; the aforementioned internal thread 1104 and external thread 1202 are both sealing threads, and the diameter of the mounting hole 1103 is smaller than the diameter of the mating hole 1102, so the mating clearance between the input end cover 120 and the housing assembly 110 at the mating hole 1102 can be relatively small, and the mating hole 1102 and the mounting hole 1103 The stepped aperture transition between them can reduce the probability of lubricating oil flowing to the threaded connection between the input end cover 120 and the housing assembly 110 in the installation space 1101, and increase the difficulty of lubricating oil leaking out through the aforementioned threaded connection. This can improve the sealing effect at the structural fit between the input end cover 120 and the housing assembly 110, reduce the loss of lubricating oil in the installation space 1101, help ensure the lubrication effect of the gear mechanism, reduce the risk of damage to the gear mechanism, and provide a guarantee for the stable operation of the wind turbine.

[0024] It should be noted that, Figure 2 The schematic diagram shows a cross-section of the input end cover 120 and its surrounding area, with the viewing angle being... Figure 1 same.

[0025] It should be noted that, in practical applications, the housing structure 100 provided in this embodiment can be used as a component of a gearbox for a wind turbine, the aforementioned installation space 1101 can be used to accommodate the gear mechanism of the aforementioned gearbox, and the input shaft hole 1201 of the aforementioned input end cover 120 can be used to pass through the drive shaft 200 of the aforementioned gearbox.

[0026] It is understandable that by setting the diameter of the mounting hole 1103 to be larger than the diameter of the input shaft hole 1201, the structural passability of the mounting hole 1103 can be improved, making it easier for the aforementioned drive shaft 200 to pass through.

[0027] It is understood that the aforementioned internal thread 1104 and the aforementioned external thread 1202 may both be pipe threads, or the surfaces of the aforementioned internal thread 1104 and the aforementioned external thread 1202 may both be provided with a sealing coating, thereby enhancing the sealing effect at the structural mating point between the input end cover 120 and the housing assembly 110.

[0028] It is understandable that by setting the input end cover 120 to be threadedly connected to the housing assembly 110, the ease of disassembly and assembly of the input end cover 120 can be improved in practical applications, thereby facilitating the maintenance of the internal components of the housing structure 100.

[0029] like Figure 3 and Figure 4 As shown, in some examples, the two ends of the input end cover 120 in the axial direction of the input shaft hole 1201 are a first cover end 1203 and a second cover end 1204, respectively. The first cover end 1203 is located in the mounting hole 1103. The outer edge of the first cover end 1203 forms a chamfer structure 1205. An oil collecting hole 1206 is provided on the chamfer structure 1205. The input end cover 120 also forms an oil collecting cavity 1207. The oil collecting hole 1206 is connected between the oil collecting cavity 1207 and the mounting hole 1103.

[0030] In this technical solution, the input end cover 120 may also have the aforementioned oil collection hole 1206 and oil collection cavity 1207. Based on the aforementioned configuration, the first end 1203 of the input end cover 120 is closer to the mounting space 1101 than the second end 1204. Thus, when the lubricating oil flows along the wall of the mounting hole 1103 toward the mating hole 1102, the first end 1203 is more likely to contact the lubricating oil preferentially and prevent the lubricating oil from flowing toward the mating hole 1102. The input end cover 120 can also use the aforementioned chamfered structure 1205 to guide the lubricating oil to the oil collection hole 1206 and use the oil collection cavity 1207 to collect the lubricating oil. This can prevent a large amount of oil from accumulating between the input end cover 120 and the wall of the mounting hole 1103, and further prevent the lubricating oil from leaking outward through the mating gap between the input end cover 120 and the housing assembly 110. This is beneficial to further enhance the sealing effect of the housing structure 100 and reduce the loss of lubricating oil during use.

[0031] It is understood that the aforementioned second cover end 1204 is located outside the housing assembly 110 or flush with the outer wall of the housing assembly 110 where the mating hole 1102 is formed, or located inside the mating hole. That is, the relative positional relationship between the second cover end 1204 and the housing assembly 110 can be set according to actual needs, and no further restrictions are imposed here.

[0032] For example, such as Figures 2 to 4 As shown, the aforementioned oil collecting cavity 1207 can be an annular space distributed around the input shaft hole 1201, and the number of the aforementioned oil collecting holes 1206 can be multiple. Multiple oil collecting holes 1206 are evenly opened in the aforementioned chamfered structure 1205 along the circumference of the input shaft hole 1201. Based on this, the volume of the oil collecting cavity 1207 and the distribution range of the oil collecting holes 1206 can be expanded, which is beneficial to improving the oil collecting efficiency of the oil collecting cavity 1207 in collecting lubricating oil.

[0033] like Figures 1 to 3 As shown, in some examples, the housing structure 100 further includes: an oil return pipe 130 connected between the input end cap 120 and the housing assembly 110, and an oil collection chamber 1207 connected to the installation space 1101 via the oil return pipe 130.

[0034] In this technical solution, the housing structure 100 may further include the aforementioned return oil pipe 130. Based on the aforementioned configuration, the lubricating oil collected in the oil collecting chamber 1207 can be guided back to the installation space 1101 through the aforementioned return oil pipe 130, so that the lubricating oil can re-participate in the lubrication of the gear mechanism. This can improve the utilization rate of lubricating oil and reduce the probability of the oil collecting chamber 1207 being fully loaded. It is beneficial to reduce the cleaning and maintenance frequency of the input end cover 120 and improve the ease of use and long-term stable operation capability of the housing structure 100.

[0035] For example, such as Figure 2 and Figure 3 As shown, the return oil pipe 130 and the oil collecting chamber 1207 are arranged along the direction of gravity, and the position of the return oil pipe 130 is lower than that of the oil collecting chamber 1207. Thus, the oil in the oil collecting chamber 1207 can flow into the return oil pipe 130 under the action of gravity, which is beneficial to ensuring the return efficiency of the lubricating oil.

[0036] like Figures 1 to 6 As shown, in some examples, the housing assembly 110 includes a housing body 111 and a mounting ring 112. The inner peripheral wall of the mounting ring 112 defines a mating hole 1102 and a mounting hole 1103, which are located at the first ring end 1121 and the second ring end 1122 of the mounting ring 112, respectively. The input end cover 120 includes an inner ring portion 121 and an outer ring portion 122. The inner ring portion 121 has an annular structure, and the inner peripheral wall of the inner ring portion 121 defines an input shaft hole 1201. An external thread 1202 is formed on the outer peripheral wall of the inner ring portion 121. The outer ring portion 122 has an annular structure and is fitted onto the outer peripheral wall of the inner ring portion 121. The outer ring portion 122 covers the first ring end 1121.

[0037] In this technical solution, the housing assembly 110 may include the aforementioned housing body 111 and the aforementioned mounting ring 112, and the input end cap 120 may include the aforementioned inner ring portion 121 and the aforementioned outer ring portion 122. Based on the aforementioned configuration, the input end cap 120 can use the outer ring portion 122 to block the end of the mating gap between the inner ring portion 121 and the mating hole 1102 that is far from the mounting hole 1103. Therefore, if a small amount of lubricating oil leaks out through the aforementioned mating gap in actual application, the input end cap 120 can also use the outer ring portion 122 to block the oil leaking out of the aforementioned mating gap, which helps to further reduce the risk of lubricating oil leaking out of the housing structure 100.

[0038] For example, the inner ring portion 121 and the outer ring portion 122 are integral structures, which can further eliminate the fitting gap between the inner ring portion 121 and the outer ring portion 122 and improve the sealing performance of the input end cover 120.

[0039] like Figure 3 As shown, in some examples, the housing structure 100 further includes a first sealing ring 140 disposed between the outer ring portion 122 and the first ring end 1121.

[0040] In this technical solution, the housing portion may further include the aforementioned first sealing ring 140. Based on the aforementioned configuration, the housing structure 100 can use the first sealing ring 140 to fill the gap between the outer ring portion 122 and the aforementioned first ring end 1121. Thus, if a small amount of lubricating oil leaks through the aforementioned mating gap in actual application, the housing structure 100 can use the first sealing ring 140 to seal the oil leaking through the aforementioned mating gap, which can further reduce the risk of lubricating oil leaking out of the housing structure 100 and reduce the loss of lubricating oil during use.

[0041] For example, the aforementioned first sealing ring 140 can be an elastic sealing ring, so that the first sealing ring 140 can have a certain elastic deformation capability, thereby enhancing the sealing and filling effect of the first sealing ring 140 on the gap between the outer ring portion 122 and the aforementioned first ring end 1121, and reducing the risk of sealing failure of the first sealing ring 140.

[0042] like Figure 3 and Figure 4 As shown, in some examples, the outer ring portion 122 has an annular protrusion structure 1221 formed at one end facing the first ring end 1121, and the first ring end 1121 has an annular groove 1123. The shape of the annular protrusion structure 1221 is adapted to the shape of the annular groove 1123, and the annular protrusion structure 1221 is embedded in the annular groove 1123.

[0043] In this technical solution, the outer ring portion 122 can be formed with the aforementioned annular protrusion structure 1221, and the first ring end 1121 can be provided with the aforementioned annular groove 1123. Based on the aforementioned configuration, when the input end cap 120 is disposed on the housing assembly 110, the outer ring portion 122 can be embedded in the first ring end 1121, and a labyrinthine leak-proof path can be formed between the outer ring portion 122 and the first ring end 1121. This can extend the path length of lubricating oil through the gap between the outer ring portion 122 and the first ring end 1121, increase the resistance during the lubricating oil seepage process, further reduce the risk of lubricating oil leakage, and improve the reliability of the fit between the input end cap 120 and the housing assembly 110, reducing the risk of the input end cap 120 loosening.

[0044] like Figure 3 and Figure 4 As shown, in some examples, the mounting ring 112 is formed with a first mating wall 1124, which is located between the mating hole 1102 and the mounting hole 1103. The inner ring portion 121 is also formed with a second mating wall 1211, which is arranged toward the first mating wall 1124. The housing structure 100 also includes a second sealing ring 150, which is disposed between the first mating wall 1124 and the second mating wall 1211.

[0045] In this technical solution, the mounting ring 112 may have the aforementioned first mating wall 1124, the inner ring portion 121 may have the aforementioned second mating wall 1211, and the housing structure 100 may also include the aforementioned second sealing ring 150. Based on the aforementioned configuration, the housing structure 100 can use the second sealing ring 150 to seal the mating gap between the input end cover 120 and the housing assembly 110 at the transition position between the mating hole 1102 and the mounting hole 1103, which can further prevent lubricating oil from flowing to the sealing threads, reduce the risk of lubricating oil seeping out of the housing structure 100, and reduce the loss of lubricating oil during use.

[0046] For example, the aforementioned second sealing ring 150 can be an elastic sealing ring, so that the second sealing ring 150 can have a certain elastic deformation capability, thereby enhancing the sealing and filling effect of the second sealing ring 150 and reducing the risk of sealing failure of the second sealing ring 150.

[0047] like Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, in some examples, the housing body 111 includes an upper housing 111a and a lower housing 111b, and the mounting ring 112 includes an upper arc-shaped plate 112a and a lower arc-shaped plate 112b. The upper housing 111a is detachably connected to the lower housing 111b. When the upper housing 111a is connected to the lower housing 111b, the upper housing 111a and the lower housing 111b form the aforementioned mounting space 1101. The upper arc-shaped plate 112a and the upper housing 111a are an integral structure, and the lower arc-shaped plate 112b and the lower housing 111b are also an integral structure. When the upper housing 111a is connected to the lower housing 111b, the upper arc-shaped plate 112a and the lower arc-shaped plate 112b are spliced ​​together to form the aforementioned mounting ring 112. Based on this, the housing body 111 can be a split structure, which facilitates the opening of the mounting space 1101 and improves the convenience of component maintenance and replacement within the mounting space 1101.

[0048] like Figure 2 , Figure 3 and Figure 6 As shown, in some examples, the housing structure 100 further includes a sliding seal ring 160 disposed on the bore wall of the input shaft hole 1201, the inner peripheral wall of the sliding seal ring 160 being used for sliding sealing engagement with the outer peripheral wall of the drive shaft 200.

[0049] In this technical solution, the housing structure 100 may further include the aforementioned sliding sealing ring 160. Based on the aforementioned configuration, in practical applications, the housing structure 100 can utilize the sliding sealing ring 160 to seal the fitting clearance between the drive shaft 200 and the hole wall of the input shaft hole 1201, thereby preventing lubricating oil in the installation space 1101 from leaking out through the aforementioned fitting clearance and reducing the impact of the housing structure 100 on the rotation of the drive shaft 200, thus reducing the kinetic energy loss of the drive shaft 200.

[0050] For example, the aforementioned sliding sealing ring 160 may be made of an elastic material, which may be, but is not limited to, rubber or silicone.

[0051] like Figure 1 , Figure 2 and Figure 5 As shown, in some examples, the housing structure 100 also includes an operating lever 170 disposed on the input end cover 120.

[0052] In this technical solution, the housing structure 100 may further include the aforementioned operating lever 170. Based on the aforementioned configuration, when assembling or disassembling the input end cover 120, the housing structure 100 can utilize the operating lever 170 to provide a force application point for the operator, allowing the operator to apply torque to the input end cover 120 via the operating lever 170, thereby driving the input end cover 120 to tighten or loosen, which improves the ease of use of the housing structure 100.

[0053] For example, the operating lever 170 is located outside the housing assembly 110, thereby facilitating operation by the operator.

[0054] For example, the operating lever 170 is disposed on the aforementioned second cover end 1204. The axial direction of the operating lever 170 is parallel to the axial direction of the input shaft hole 1201, and the axis of the operating lever 170 is offset from the axis of the input shaft hole 1201, thereby making it easier for the operator to apply torque to the input end cover 120 through the operating lever 170.

[0055] According to a second aspect of the present disclosure, a gearbox for a wind turbine is provided, comprising: a housing structure 100 as described in any of the first aspects above.

[0056] Since the gearbox for wind turbine provided in this embodiment includes the housing structure 100 as proposed in any of the first aspects above, it possesses all the beneficial effects of the housing structure 100, which will not be elaborated here.

[0057] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0058] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A box structure, characterized in that, include: The housing assembly has a mounting space, a mating hole, and a mounting hole, wherein the mounting hole is located between the mating hole and the mounting space, and the wall of the mating hole has an internal thread. An input end cap is formed with an input shaft hole and an external thread, the external thread being adapted to the internal thread. The input end cap is inserted into the mating hole and is threadedly connected to the housing assembly. The input shaft hole communicates with the installation space through the mounting hole. Wherein, both the internal thread and the external thread are sealing threads, the mating hole, the mounting hole and the input shaft hole are arranged coaxially, and the diameter of the mounting hole is larger than the diameter of the input shaft hole and smaller than the diameter of the mating hole.

2. The box structure according to claim 1, characterized in that, The input end cover has a first end and a second end on the axial direction of the input shaft hole. The first end is located in the mounting hole. The outer edge of the first end has a chamfered structure. An oil collecting hole is provided on the chamfered structure. The input end cover also has an oil collecting cavity. The oil collecting hole is connected between the oil collecting cavity and the mounting hole.

3. The box structure according to claim 2, characterized in that, Also includes: The return oil pipe connects the input end cap and the housing assembly, and the oil collection chamber is connected to the installation space through the return oil pipe.

4. The box structure according to claim 1, characterized in that, The housing assembly includes a housing body and a mounting ring. The inner peripheral wall of the mounting ring defines the mating hole and the mounting hole, which are located at a first ring end and a second ring end of the mounting ring, respectively. The input end cap includes an inner ring portion and an outer ring portion. The inner ring portion has an annular structure, and the inner peripheral wall of the inner ring portion defines the input shaft hole. The external thread is formed on the outer peripheral wall of the inner ring portion. The outer ring portion has an annular structure and is sleeved on the outer peripheral wall of the inner ring portion. The outer ring portion covers the first ring end.

5. The box structure according to claim 4, characterized in that, Also includes: The first sealing ring is disposed between the outer ring portion and the first ring end.

6. The box structure according to claim 4, characterized in that, The outer ring portion has an annular protrusion structure at one end facing the first ring end, and the first ring end has an annular groove. The shape of the annular protrusion structure is adapted to the shape of the annular groove, and the annular protrusion structure is embedded in the annular groove.

7. The box structure according to claim 4, characterized in that, The mounting ring has a first mating wall located between the mating hole and the mounting hole. The inner ring also has a second mating wall facing the first mating wall. The housing structure also includes a second sealing ring disposed between the first mating wall and the second mating wall.

8. The box structure according to any one of claims 1 to 7, characterized in that, Also includes: A sliding seal ring is disposed on the wall of the input shaft hole, and the inner peripheral wall of the sliding seal ring is used to slide and seal with the outer peripheral wall of the drive shaft.

9. The box structure according to any one of claims 1 to 7, characterized in that, Also includes: An operating lever is located on the input end cover.

10. A gearbox for a wind turbine generator set, characterized in that, include: The box structure as described in any one of claims 1 to 9.

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