Sealing structure for gearbox and gearbox

Abstract

The utility model relates to the technical field of gear box structures, and provides a sealing structure for a gear box and the gear box. The main shaft is sleeved with the transparent cover, the transparent cover and a box body of the gearbox are fixed, a first flow channel is formed in the transparent cover, and the first flow channel is provided with an inlet end and an outlet end. The outer oil sealing ring is arranged on the outer side of the transparent cover, fixedly arranged outside the main shaft in a sleeving mode and sealed with the main shaft, the peripheral edge of the outer oil sealing ring is connected with the transparent cover in a sealed mode, and the middle of the outer oil sealing ring and the transparent cover are arranged at intervals to form a second flow channel which is communicated with the outlet end of the first flow channel. Sealing media are arranged in the first flow channel and the second flow channel so as to prevent oil in the gearbox from entering the second flow channel. The sealing structure for the gear box is simple in structure and convenient to install, and the problem that lubricating oil in the gear box leaks out of the box body can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear boxes, in particular to a sealing structure for a gear box and the gear box. Background Art

[0002] Gearboxes are widely used, for example in wind turbines. They are a crucial mechanical component used extensively in wind turbines. Their primary function is to transfer the power generated by the wind rotor to the generator, allowing it to achieve the desired speed.

[0003] Because a large number of gears mesh within a gearbox, a large amount of lubricating oil is stored inside the gearbox to improve the fatigue resistance of the gear tooth surfaces and reduce vibration and noise during operation. This lubrication film forms on the gears, achieving lubrication. However, during operation, the oil is stirred and splashed by the gears, often leaking out of the gearbox through the gap between the main shaft and the gearbox.

[0004] Existing gearboxes use a felt-filled system between the gearbox and the main shaft to seal the gap and prevent lubricant leakage. However, if the gearbox experiences lubrication or operating abnormalities, the oil level inside the gearbox is too high, or the oil return is blocked, the internal lubricant can easily break through the felt and leak out of the gearbox.

[0005] Therefore, there is an urgent need for a gearbox sealing structure and a gearbox to solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a sealing structure for a gear box and a gear box, which are easy to assemble and can effectively prevent the oil in the gear box from flowing to the outside through the main shaft.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] The sealing structure for the gearbox includes:

[0009] A transparent cover is sleeved on the main shaft and fixed to the gearbox body. A first flow channel is defined inside the transparent cover. The first flow channel has an inlet and an outlet.

[0010] An external oil sealing ring is arranged on the outside of the above-mentioned transparent cover. The above-mentioned external oil sealing ring is fixedly sleeved on the above-mentioned main shaft and sealed with the above-mentioned main shaft. The outer peripheral edge of the above-mentioned external oil sealing ring is sealed with the above-mentioned transparent cover. The middle part of the above-mentioned external oil sealing ring is spaced apart from the above-mentioned transparent cover to form a second flow channel. The above-mentioned second flow channel is connected with the outlet end of the above-mentioned first flow channel. Sealing medium is provided in the above-mentioned first flow channel and the above-mentioned second flow channel to prevent the oil in the above-mentioned gear box from passing through the above-mentioned main shaft into the above-mentioned second flow channel.

[0011] As a preferred technical solution of the sealing structure for the gear box, the transparent cover is fixed to the box body by a first threaded fastener.

[0012] As a preferred technical solution of the sealing structure for the gearbox, the external oil sealing ring is interference fit with the main shaft.

[0013] As a preferred technical solution of the above-mentioned sealing structure for the gearbox, it also includes a second threaded fastener, and the second threaded fastener connects the external oil sealing ring and the above-mentioned main shaft along the radial direction of the above-mentioned main shaft.

[0014] As a preferred technical solution for the sealing structure for the above-mentioned gearbox, one of the above-mentioned external oil sealing ring and the above-mentioned transparent cover is provided with a first slide groove, and the other is provided with a first slider. The above-mentioned first slide groove and the above-mentioned first slider are both annular around the axis of the above-mentioned main shaft. The above-mentioned first slider is inserted into the above-mentioned first slide groove so that the outer peripheral edge of the above-mentioned external oil sealing ring is sealed and connected with the above-mentioned transparent cover.

[0015] As a preferred technical solution for the above-mentioned gearbox sealing structure, it also includes an oil cup, which is inserted into the inlet end of the above-mentioned first flow channel, and the above-mentioned sealing medium is injected into the above-mentioned first flow channel and the above-mentioned second flow channel through the above-mentioned oil cup.

[0016] As a preferred technical solution of the above-mentioned sealing structure for the gear box, it also includes felt, and the above-mentioned felt is filled between the port of the above-mentioned second flow channel and the above-mentioned main shaft.

[0017] As an optimal technical solution for the sealing structure of the gearbox, it also includes an internal oil sealing ring, which is arranged on the inner side of the transparent cover. The internal oil sealing ring is fixedly sleeved on the main shaft and forms a seal with the main shaft. The internal oil sealing ring is sealed with the transparent cover.

[0018] As a preferred technical solution for the sealing structure for the above-mentioned gearbox, one of the above-mentioned internal oil sealing ring and the above-mentioned transparent cover is provided with a second slider, and the other is provided with a second slide groove. The above-mentioned second slider and the above-mentioned second slide groove are both annular around the axis of the above-mentioned main shaft. The above-mentioned second slider is inserted into the above-mentioned second slide groove so that the outer peripheral edge of the above-mentioned internal oil sealing ring is sealed and connected to the above-mentioned transparent cover.

[0019] A gearbox is also provided, comprising: a box body, a bearing assembly, the above-mentioned main shaft and the above-mentioned sealing structure for the gearbox, the above-mentioned main shaft is installed in the above-mentioned box body through the above-mentioned bearing assembly, one end of the above-mentioned main shaft extends out of the above-mentioned box body, and the above-mentioned transparent cover is arranged at the position where the above-mentioned main shaft extends out of the above-mentioned box body.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a sealing structure for a gearbox and a gearbox, the sealing structure comprising a transparent cover and an external oil sealing ring. The transparent cover is sleeved on a main shaft and fixed to the gearbox body, a first flow channel is defined within the transparent cover, and the first flow channel has an inlet end and an outlet end; the external oil sealing ring is disposed on the outside of the transparent cover, is fixedly sleeved on the main shaft, and seals the main shaft, the outer peripheral edge of the external oil sealing ring being sealed to the transparent cover, and a middle portion of the external oil sealing ring is spaced apart from the transparent cover to form a second flow channel, the second flow channel being in communication with the outlet end of the first flow channel, and a sealing medium is disposed within the first and second flow channels to prevent oil in the gearbox from passing through the main shaft and entering the second flow channel.

[0022] The transparent cover is fixed to the gear box body, and a first flow channel is opened inside the transparent cover. The first flow channel forms two ports on the end face of the transparent cover, which are respectively recorded as the inlet end of the sealing medium and the outlet end of the sealing medium. The outlet end of the sealing medium is formed on the axial end face of the transparent cover on the side of the gear box body that is away from the gear box body, and relative to the inlet end of the sealing medium, the outlet end of the sealing medium is radially adjacent to the main shaft; the external oil sealing ring is fixedly sleeved on the main shaft and can rotate with the main shaft. The inner ring of the external oil sealing ring is sealed with the main shaft, which can limit the leakage of the lubricating oil in the gear box from the gap between the external oil sealing ring and the main shaft. A second flow channel is formed between the ring and the transparent cover. Since the circumferential edge of the external oil sealing ring is connected to the transparent cover, the second flow channel has only one port, which is formed on the inner ring of the transparent cover and the external oil sealing ring. In the axial projection of the main shaft, the outlet end of the sealing medium is located in the middle of the external oil sealing ring, that is, the first flow channel is connected to the second flow channel, and sealing medium is provided in the first flow channel and the second flow channel. When the lubricating oil in the gear box flows to the second flow channel through the main shaft, the lubricating oil meets the sealing medium, and the sealing medium fills the first flow channel and the second flow channel, thereby blocking the lubricating oil from entering the second flow channel and avoiding leakage of the lubricating oil.

[0023] In this manner, the gear box equipped with the gear box sealing structure can suppress the problem of the lubricating oil in the gear box leaking out of the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the assembly of the sealing structure for the gear box, the main shaft and the box body provided by the embodiment of the utility model;

[0026] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0027] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle.

[0028] In the picture:

[0029] 100. Sealing structure for gearbox;

[0030] 110, transparent cover; 111, first flow channel; 112, second flow channel; 113, second slider;

[0031] 120. External oil sealing ring; 121. First slider;

[0032] 130. First threaded fastener;

[0033] 140, oil cup;

[0034] 150, second threaded fastener; 160, felt; 170, internal oil sealing ring;

[0035] 200, main shaft; 300, box body. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0037] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0040] like Figures 1 to 3 As shown, the present invention provides a sealing structure 100 for a gearbox, comprising a transparent cover 110 and an external oil sealing ring 120. The transparent cover 110 is sleeved on the main shaft 200 and fixed to the gearbox housing 300. A first flow channel 111 is defined within the transparent cover 110, having an inlet and an outlet. The external oil sealing ring 120 is disposed on the outside of the transparent cover 110 and is fixedly sleeved on the main shaft 200 and sealed therewith. The outer edge of the external oil sealing ring 120 is sealedly connected to the transparent cover 110. A second flow channel 112 is formed between the central portion of the external oil sealing ring 120 and the transparent cover 110. The second flow channel 112 communicates with the outlet of the first flow channel 111. Sealing medium is provided within the first and second flow channels 111 and 112 to prevent oil in the gearbox from passing through the main shaft 200 and entering the second flow channel 112.

[0041] Exemplarily, the transparent cover 110 is fixed to the housing 300 of the gearbox, and a first flow channel 111 is opened inside the transparent cover 110. The first flow channel 111 forms two ports on the end face of the transparent cover 110, which are respectively recorded as the inlet end of the sealing medium and the outlet end of the sealing medium, wherein the outlet end of the sealing medium is formed on the axial end face of the transparent cover 110 on the side facing away from the housing 300 of the gearbox, and relative to the inlet end of the sealing medium, the outlet end of the sealing medium is radially adjacent to the main shaft 200; the external oil sealing ring 120 is fixedly sleeved on the main shaft 200 and can rotate with the main shaft 200. The inner ring of the external oil sealing ring 120 is sealed with the main shaft 200, which can limit the lubricating oil in the gearbox from leaking from the gap between the external oil sealing ring 120 and the main shaft 200. A second flow channel 112 is formed between the ring 120 and the transparent cover 110. Since the circumferential edge of the external oil sealing ring 120 is connected to the transparent cover 110, the second flow channel 112 has only one port, which is formed on the inner ring of the transparent cover 110 and the external oil sealing ring 120. In the axial projection of the main shaft 200, the outlet end of the sealing medium is located in the middle of the external oil sealing ring 120, that is, the first flow channel 111 is connected to the second flow channel 112, and a sealing medium is provided in the first flow channel 111 and the second flow channel 112. When the lubricating oil in the gearbox flows to the second flow channel 112 through the main shaft 200, the lubricating oil meets the sealing medium, and the sealing medium fills the first flow channel 111 and the second flow channel 112, thereby blocking the lubricating oil from entering the second flow channel 112 and preventing oil leakage.

[0042] In this way, the gear box sealing structure 100 has a simple structure, is easy to install, and can prevent the lubricating oil in the gear box from leaking out of the housing 300 .

[0043] It should be noted that the sealing medium is generally butter, and in other embodiments, it can also be high-pressure gas.

[0044] It should be noted that if the pressure in the gearbox is too high, the lubricating oil may further compress the sealing medium, causing part of the lubricating oil to enter the second flow channel 112. When the pressure of the sealing medium and the pressure of the lubricating oil reach equilibrium, part of the lubricating oil stagnates in the second flow channel 112.

[0045] Optionally, the transparent cover 110 is fixed to the box body 300 via a first threaded fastener 130 .

[0046] For example, the transparent cover 110 is provided with a through hole along the axial direction of the main shaft 200, and the housing 300 of the gear box is provided with a threaded hole along the axial direction of the main shaft 200. The first threaded fastener 130 passes through the through hole of the transparent cover 110 along the axial direction of the main shaft 200 and is threadedly connected with the threaded hole of the housing 300 of the gear box. The transparent cover 110 is clamped between the nut of the first threaded fastener 130 and the housing 300 in the axial direction of the main shaft 200, thereby completing the fixation of the transparent cover 110 and the housing 300 of the gear box. The threaded connection is easy to install and has a certain load capacity.

[0047] Optionally, the outer oil sealing ring 120 is interference fit with the main shaft 200 .

[0048] For example, the shaft diameter of the main shaft 200 is larger than the inner diameter of the external oil sealing ring 120. When the external oil sealing ring 120 and the main shaft 200 are sleeved, an interference fit is achieved. In this way, the external oil sealing ring 120 and the main shaft 200 can be relatively fixed, and the external oil sealing ring 120 and the main shaft 200 can be sealed, preventing the oil in the gear box from leaking to the outside of the gear box through the gap between the external oil sealing ring 120 and the main shaft 200.

[0049] Optionally, the gearbox sealing structure 100 further includes a second threaded fastener 150 , which connects the outer oil sealing ring 120 and the main shaft 200 along the radial direction of the main shaft 200 .

[0050] For example, the external oil sealing ring 120 is provided with a threaded through hole along its radial direction, and the second threaded fastener 150 is inserted into the threaded through hole along the radial direction of the main shaft 200 and is threadedly connected to the external oil sealing ring 120. By rotating the second threaded fastener 150, the radial spacing between the second threaded fastener 150 and the main shaft 200 can be changed, and the end of the second threaded fastener 150 can abut against the circumferential side wall of the main shaft 200, further maintaining the stability of the relative position of the external oil sealing ring 120 and the main shaft 200.

[0051] Optionally, one of the external oil sealing ring 120 and the transparent cover 110 is provided with a first slide groove, and the other is provided with a first slider 121. The first slide groove and the first slider 121 are both annular around the axis of the main shaft 200. The first slider 121 is inserted into the first slide groove so that the outer peripheral edge of the external oil sealing ring 120 is sealed and connected to the transparent cover 110.

[0052] For example, a first slide groove is provided on the axial end surface of the transparent cover 110 on the side facing away from the gear box body 300. In the axial projection of the main shaft 200, the first slide groove is annular and coaxial with the main shaft 200. A first slider 121 is provided on the radial edge of the external oil sealing ring 120 along the axial direction of the main shaft 200. The first slider 121 is annular and adapted to the first slide groove, and in the axial direction of the main shaft 200, the length of the first slider 121 is greater than the depth of the first slide groove. In this way, when When the first slider 121 is plugged into the first slide groove, a gap is formed between the middle of the external oil sealing ring 120 and the transparent cover 110, namely the above-mentioned second flow channel 112. In this way, the plugging of the first slide groove and the first slider 121 can keep the external oil sealing ring 120 and the transparent cover 110 relatively fixed in the radial position of the main shaft 200, and form the second flow channel 112 between the external oil sealing ring 120 and the transparent cover 110, closing the outlet of the second flow channel 112 on the side facing away from the main shaft 200.

[0053] Optionally, the gearbox sealing structure 100 further includes an oil cup 140, which is inserted at the inlet end of the first flow channel 111. The sealing medium is injected into the first flow channel 111 and the second flow channel 112 through the oil cup 140. In this way, injecting the sealing medium into the first flow channel 111 through the oil cup 140 facilitates installation and operation.

[0054] It should be noted that the oil cup 140 is an existing structural component, and its specific structure and operating principle are not described here in detail.

[0055] Optionally, the gearbox sealing structure 100 further includes a felt 160 , which is filled between the port of the second flow channel 112 and the main shaft 200 .

[0056] Exemplarily, the transparent cover 110 is provided with a mounting groove, and the external oil sealing ring 120 is assembled with the transparent cover 110 to form a second flow channel 112 in a stepped shape, wherein the small diameter section is located on the side of the large diameter section facing away from the main shaft 200, and the first flow channel 111 is connected to the large diameter section through the small diameter section, and the large diameter section forms the port of the second flow channel 112, and the felt 160 is filled between the large diameter section and the main shaft 200. The lubricating oil overflowing from the main shaft 200 is preferentially blocked outside the second flow channel 112 by the felt 160 located in the large diameter section. If the gearbox lubrication or operation is abnormal, the oil level inside the box body 300 is too high or the oil return is not smooth, causing the internal lubricating oil to break through the felt 160 and enter the large diameter section, the sealing medium in the first flow channel 111 and the second flow channel 112 can further prevent the lubricating oil from passing through.

[0057] Optionally, the gearbox sealing structure 100 further includes an internal oil sealing ring 170 , which is disposed on the inner side of the transparent cover 110 . The internal oil sealing ring 170 is fixedly sleeved on the main shaft 200 and forms a seal with the main shaft 200 . The internal oil sealing ring 170 is sealed and connected to the transparent cover 110 .

[0058] Illustratively, the inner oil sealing ring 170 is interference-fitted with the main shaft 200 to limit the oil in the gearbox from flowing out of the gearbox along the main shaft 200 .

[0059] Optionally, one of the internal oil sealing ring 170 and the transparent cover 110 is provided with a second slider 113, and the other is provided with a second slide groove. The second slider 113 and the second slide groove are both annular around the axis of the main shaft 200. The second slider 113 is inserted into the second slide groove so that the outer peripheral edge of the internal oil sealing ring 170 is sealed and connected to the transparent cover 110.

[0060] Exemplarily, a second slide groove is provided on the axial end face of the internal oil sealing ring 170 facing the transparent cover 110. In the axial projection of the main shaft 200, the second slide groove is in the shape of a circular ring and is coaxial with the main shaft 200. The transparent cover 110 is provided with a second slider 113 protruding along the axial direction of the main shaft 200. The second slider 113 is in the shape of a circular ring that is adapted to the second slide groove. In this way, the connection between the second slide groove and the second slider 113 can keep the external oil sealing ring 120 and the transparent cover 110 relatively fixed in the radial position of the main shaft 200, and form a sealing structure.

[0061] To further explain, since the external oil sealing ring 120 and the internal oil sealing ring 170 both rotate with the main shaft 200, and the transparent cover 110 is fixed to the gearbox body 300, the external oil sealing ring 120 and the transparent cover 110 and the external oil sealing ring 120 and the transparent cover 110 both rotate relative to each other, and there are gaps between the connection between the first slider 121 and the first slide groove and the connection between the second slider 113 and the second slide groove, but the connection structure forms a relatively bent gap, that is, a relatively simplified labyrinth sealing structure, which makes it difficult for oil to pass through the gap.

[0062] A gearbox is also provided, comprising a housing 300, a bearing assembly, a main shaft 200, and the aforementioned gearbox sealing structure 100. The main shaft 200 is mounted to the housing 300 via the bearing assembly, with one end of the main shaft 200 extending outside the housing 300. A transparent cover 110 is disposed at the position where the main shaft 200 extends out of the housing 300. A gearbox employing the aforementioned gearbox sealing structure 100 can effectively reduce the problem of lubricating oil leakage therein and is simple to assemble.

[0063] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A sealing structure for a gearbox, characterized in that: include: A transparent cover (110), the transparent cover (110) is sleeved on the main shaft (200) and fixed to the gear box body (300), a first flow channel (111) is opened inside the transparent cover (110), and the first flow channel (111) has an inlet end and an outlet end; An external oil sealing ring (120) is arranged on the outside of the transparent cover (110). The external oil sealing ring (120) is fixedly sleeved on the main shaft (200) and sealed with the main shaft (200). The outer peripheral edge of the external oil sealing ring (120) is sealed with the transparent cover (110). The middle part of the external oil sealing ring (120) is spaced apart from the transparent cover (110) to form a second flow channel (112). The second flow channel (112) is communicated with the outlet end of the first flow channel (111). A sealing medium is provided in the first flow channel (111) and the second flow channel (112) to prevent the oil in the gear box from passing through the main shaft (200) and entering the second flow channel (112).

2. The gear box sealing structure according to claim 1, characterized in that: The transparent cover (110) is fixed to the box body (300) via a first threaded fastener (130).

3. The gear box sealing structure according to claim 1, wherein: The external oil sealing ring (120) is interference-fitted with the main shaft (200).

4. The gear box sealing structure according to claim 3, characterized in that: The invention also includes a second threaded fastener (150), wherein the second threaded fastener (150) connects the outer oil sealing ring (120) and the main shaft (200) along the radial direction of the main shaft (200).

5. The gear box sealing structure according to claim 1, wherein: One of the external oil sealing ring (120) and the transparent cover (110) is provided with a first sliding groove, and the other is provided with a first slider (121). The first sliding groove and the first slider (121) are both annular around the axis of the main shaft (200). The first slider (121) is inserted into the first sliding groove so that the outer peripheral edge of the external oil sealing ring (120) is sealed and connected to the transparent cover (110).

6. The gear box sealing structure according to claim 1, wherein: It also includes an oil cup (140), which is inserted into the inlet end of the first flow channel (111), and the sealing medium is injected into the first flow channel (111) and the second flow channel (112) through the oil cup (140).

7. The sealing structure for a gear box according to claim 1, wherein: It also includes a felt (160), wherein the felt (160) is filled between the port of the second flow channel (112) and the main shaft (200).

8. The gear box sealing structure according to claim 1, wherein: The invention also includes an internal oil sealing ring (170), which is arranged on the inner side of the transparent cover (110). The internal oil sealing ring (170) is fixedly sleeved on the main shaft (200) and forms a seal with the main shaft (200). The internal oil sealing ring (170) is sealed and connected to the transparent cover (110).

9. The gear box sealing structure according to claim 8, characterized in that: One of the internal oil sealing ring (170) and the transparent cover (110) is provided with a second slider (113), and the other is provided with a second slide groove. Both the second slider (113) and the second slide groove are annular around the axis of the main shaft (200). The second slider (113) is inserted into the second slide groove so that the outer peripheral edge of the internal oil sealing ring (170) is sealed and connected to the transparent cover (110).

10. Gear box, characterized in that, The invention comprises a housing (300), a bearing assembly, the main shaft (200) and a sealing structure (100) for a gear box according to any one of claims 1 to 9, wherein the main shaft (200) is mounted on the housing (300) through the bearing assembly, one end of the main shaft (200) extends out of the housing (300), and the transparent cover (110) is arranged at a position where the main shaft (200) extends out of the housing (300).

Images