Sealing structure and automobile

Abstract

The invention discloses a sealing structure, and relates to the technical field of part sealing. The sealing structure comprises a transmission mechanism, a half shaft and an oil seal. The transmission mechanism comprises a shell and an output shaft, the shell is provided with an inner cavity, and the shell is provided with a through hole communicated with the inner cavity; the output shaft is arranged in the inner cavity and provided with an extending section inserted into the penetrating hole, and a mounting hole coaxial with the extending section is formed in the side, away from the inner cavity, of the extending section. The half shaft is inserted into the mounting hole and is in transmission connection with the output shaft; and the oil seal sleeves the extension section and is connected with the shell. According to the sealing structure, the probability of lubricating liquid leakage and the probability of abrasion between the half shaft and the output shaft are reduced, the structure is simple, and the cost is low. The invention further provides an automobile comprising the sealing structure, and the automobile is provided with the sealing structure, so that the probability of lubricating liquid leakage and the probability of abrasion of the half shaft and the output shaft are reduced; in addition, due to the fact that the sealing structure is simple in structure and low in cost, the cost of the automobile can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of component sealing, and in particular to a sealing structure and an automobile. Background Art

[0002] In the automotive field, the transmission mechanism of the electric drive assembly of new energy vehicles or the powertrain of traditional fuel vehicles is connected to the half-axle, so as to transmit the generated torque to the vehicle wheel hub and make the vehicle run. The transmission mechanism of the electric drive assembly of new energy vehicles or the powertrain of traditional fuel vehicles needs to be lubricated with lubricating fluid to improve the service life and operation stability of the transmission mechanism. Since the half-axle is connected to the transmission mechanism, a sealing structure needs to be designed to seal the half-axle and the transmission mechanism to avoid leakage of lubricating fluid in the transmission mechanism.

[0003] At present, the sealing structures are mainly divided into self-sealing structures and non-self-sealing structures. However, the common self-sealing structure is complex in structure and high in cost, and there is no effective lubrication and heat dissipation between the half-shaft and the output shaft of the transmission mechanism, which easily causes wear of the transmission part of the half-shaft and the output shaft; while in the common non-self-sealing structure, the half-shaft and the output shaft of the transmission mechanism rely on a section of optical axis mating surface to achieve positioning, and the optical axis mating surface has a certain radial clearance due to heat dissipation and assembly reasons. Therefore, the half-shaft has a radial runout during actual operation, and this radial runout easily causes leakage of the lubricating fluid in the transmission mechanism. Summary of the invention

[0004] In view of the above, it is necessary to propose a sealing structure and a car to reduce the probability of lubricating fluid leakage and the probability of wear of the half shaft and the output shaft, and to reduce the complexity and cost of the sealing structure.

[0005] An embodiment of the present application provides a sealing structure, including a transmission mechanism, a half-shaft and an oil seal; the transmission mechanism includes a shell and an output shaft, the shell having an inner cavity, the shell being provided with a through hole connected to the inner cavity; the output shaft is arranged in the inner cavity, the output shaft has an extension section inserted into the through hole, and the side of the extension section away from the inner cavity is provided with a mounting hole coaxially arranged with the extension section; the half-shaft is inserted into the mounting hole and is transmission-connected to the output shaft; the oil seal sleeve is arranged in the extension section and is connected to the shell.

[0006] The sealing structure of the embodiment of the present application is achieved by extending the output shaft to form an extension section, and the extension section is inserted into the through hole opened in the shell. The oil seal is arranged on the extension section and connected to the shell, so that the oil seal can cooperate with the extension section and the shell to seal the through hole. Since the output shaft and the oil seal are both installed in the shell, the concentricity of the oil seal and the output shaft is very high, and the radial runout of the output shaft will also be controlled to be very small, thereby effectively avoiding the oil seal leakage due to the large radial runout of the output shaft, thereby reducing the probability of lubricating fluid leakage. In addition, by opening a mounting hole coaxially arranged with the extension section on the extension section, the half-shaft is inserted into the mounting hole and connected to the output shaft in transmission, the coaxiality of the half-shaft and the output shaft is also very high, and the radial runout when the output shaft drives the half-shaft to rotate is small, thereby further reducing the probability of lubricating fluid leaking from the oil seal; and, the mounting hole can accommodate lubricating grease, and the lubricating grease can lubricate the transmission connection between the output shaft and the half-shaft, thereby reducing the probability of wear between the half-shaft and the output shaft; further, since the extension section extends into the through hole, and the connection between the oil seal and the half-shaft and the extension section of the output shaft is relatively simple, the sealing structure is simple in structure and low in cost. In addition, the design of the extension section extending into the through hole also facilitates the disassembly and assembly of the oil seal and the half-shaft.

[0007] In some embodiments, the extension section extends to an end of the through hole away from the inner cavity, and the oil seal sleeve is disposed at an end of the extension section away from the inner cavity.

[0008] In this way, since the end of the through hole away from the inner cavity is close to the outer wall of the shell, the oil seal sleeve is arranged on the end of the extension section away from the inner cavity, which is convenient for disassembling and assembling the oil seal and connecting the half shaft with the extension section.

[0009] In some embodiments, an inner wall of the through hole at one end away from the inner cavity is provided with a mounting ring groove, and the oil seal is arranged in the mounting ring groove.

[0010] In this way, by providing a mounting ring groove, it is convenient to install the oil seal; in addition, by providing the oil seal in the mounting ring groove, the size of the gap between the extension section and the inner wall of the perforation can be reduced, thereby reducing the amount of lubricating fluid flowing between the extension section and the inner wall of the perforation, which is beneficial to improving the sealing effect of the sealing structure.

[0011] In some embodiments, the sealing structure further includes a dust cover, which is sleeved on one end of the half-shaft or the extension section away from the inner cavity, and the dust cover is located on a side of the oil seal away from the inner cavity and abuts against the oil seal.

[0012] In this way, by providing the dust cover, it is possible to effectively prevent dust from entering the oil seal and affecting the sealing effect of the oil seal.

[0013] In some embodiments, the oil seal includes a main lip and a dust lip, the main lip is sleeved on one end of the extension section away from the inner cavity and connected to the shell, and the dust lip is arranged on the main lip and abuts against the dust cover.

[0014] In this way, the main lip cooperates with the extension section and the housing to prevent the lubricating fluid from leaking from the perforation, and the dust lip cooperates with the dust cover to prevent dust from entering the oil seal, thereby facilitating improving the sealing effect of the sealing structure.

[0015] In some embodiments, the half-shaft includes an optical axis section and a transmission section connected to each other, the optical axis section and the transmission section are both inserted into the mounting hole, the optical axis section is located on the side of the transmission section away from the inner cavity, the transmission section is connected to the output shaft in transmission, a groove is provided on the peripheral side wall of the optical axis section, the sealing structure also includes a sealing ring, the sealing ring is provided in the groove and abuts against the inner wall of the mounting hole, the mounting hole is used to receive lubricating grease, and the sealing ring is used to limit the leakage of the lubricating grease.

[0016] In this way, by arranging lubricating grease in the mounting hole, the transmission part of the transmission section and the output shaft can be lubricated, thereby reducing the probability of wear of the half shaft and the output shaft; by arranging a sealing ring to limit the leakage of lubricating grease, the lubricating effect of the lubricating grease on the transmission part of the transmission section and the output shaft can be ensured, the frequency of adding lubricating grease can be reduced, and the maintenance cost can be reduced; by arranging the sealing ring in the groove opened on the peripheral side wall of the optical axis section, the axial movement of the sealing ring along the optical axis section can be effectively avoided, thereby ensuring the sealing effect of the sealing ring.

[0017] In some embodiments, a first slot is formed on the inner wall of the mounting hole, and a second slot is formed on the peripheral side wall of the transmission section and is arranged opposite to the first slot. The sealing structure also includes a clamping piece, which is clamped in the first slot and the second slot, and is used to limit the optical axis section and the transmission section from escaping from the mounting hole. In this way, when the half shaft is connected to the extension section, it is only necessary to engage the clamping member with the second clamping slot, and then the clamping member moves with the transmission section and moves into the first clamping slot, which is conducive to improving the convenience of connecting the half shaft and the extension section.

[0018] In some embodiments, the mounting hole is in communication with the inner cavity, and the sealing structure further includes a plug, which is disposed at one end of the mounting hole close to the inner cavity to limit the lubricating fluid in the inner cavity from entering the mounting hole.

[0019] In this way, by setting the mounting hole to be connected with the inner cavity, that is, the mounting hole passes through both ends of the output shaft, it is convenient to process the mounting hole; in addition, by setting a plug to seal the end of the mounting hole close to the inner cavity, since the shaft-tooth structure in the shell generates a lot of debris during transmission, the plug can effectively prevent the lubricating fluid in the shell from carrying debris into the mounting hole to affect the transmission connection between the half shaft and the output shaft.

[0020] In some embodiments, the inner wall of the mounting hole at one end close to the inner cavity is provided with a stop step and a clamping groove, the stop step is located on the side of the clamping groove away from the inner cavity, the plug abuts against the stop step, and the sealing structure also includes a pressing piece, the pressing piece is clamped with the clamping groove and abuts against the side of the plug away from the stop step, and the pressing piece is used to press the plug against the stop step.

[0021] In this way, when installing the plug, the plug is installed in the mounting hole and abutted against the stopping step. The stopping step stops the plug from one side, and then the pressing piece is engaged with the clamping groove and the plug is pressed from the other side. The stopping step and the pressing piece cooperate to limit the two sides of the plug, which is beneficial to improve the accuracy and convenience of installing the plug.

[0022] An embodiment of the present application also provides a car, including the sealing structure as described above.

[0023] The automobile of the embodiment of the present application reduces the probability of lubricating fluid leakage and the probability of wear of the half-shaft and the output shaft by providing a sealing structure; in addition, since the sealing structure has a simple structure and low cost, it can also reduce the cost of the automobile. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the sealing structure provided in the embodiment of the present application.

[0025] Figure 2 yes Figure 1 The sealing structure shown is a cross-sectional view along the II-II direction.

[0026] Figure 3 yes Figure 1 Schematic diagram of the exploded structure of the sealing structure shown.

[0027] Figure 4 yes Figure 1 A schematic diagram of the exploded structure of the sealing structure shown in another angle.

[0028] Figure 5 yes Figure 1 A schematic three-dimensional structure diagram of the matching output shaft, connecting member and gear in the sealing structure shown.

[0029] Figure 6 It is a schematic diagram of the structure of the automobile provided in an embodiment of the present application.

[0030] Main component symbols Automobile 1000, sealing structure 100, transmission mechanism 10, housing 11, inner cavity 111, through hole 112, mounting ring groove 1121, assembly protrusion 113, first limiting groove 1131, first reinforcing rib 114, second reinforcing rib 115, output shaft 12, extension section 121, mounting hole 122, first clamping groove 1221, inner spline 1222, stop step 1223, clamping groove 1224, connecting piece 13, gear 1 4, second limiting groove 141, first bearing 15, inner ring 151, outer ring 152, first clamping piece 16, second clamping piece 17, half shaft 20, connecting section 21, optical axis section 22, groove 221, transmission section 23, second clamping groove 231, external spline 232, oil seal 30, main lip 31, dust lip 32, dust cover 40, sealing ring 50, clamping piece 60, plug 70, plug cover 71, second bearing 72, pressing piece 80. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication, it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. Some embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0034] See also Figure 1 and Figure 2 An embodiment of the present application provides a sealing structure 100 , including a transmission mechanism 10 , a half shaft 20 and an oil seal 30 .

[0035] The transmission mechanism 10 includes a shell 11 and an output shaft 12. The shell 11 has an inner cavity 111, and is provided with a through hole 112 connected to the inner cavity 111; the output shaft 12 is arranged in the inner cavity 111, and has an extension section 121 inserted into the through hole 112, and a mounting hole 122 coaxially arranged with the extension section 121 is provided on the side of the extension section 121 away from the inner cavity 111.

[0036] The half shaft 20 is inserted into the mounting hole 122 and is drivingly connected to the output shaft 12 . The oil seal 30 is sleeved on the extension section 121 and is connected to the housing 11 .

[0037] The transmission mechanism 10 may be a reducer, differential, etc. of an electric drive assembly of a new energy vehicle or a power assembly of a traditional fuel vehicle. A shaft gear structure (not shown) is also provided in the housing 11 of the transmission mechanism 10. A lubricating fluid is provided in the inner cavity 111 of the housing 11 to lubricate the shaft gear structure. The shaft gear structure drives the output shaft 12 to rotate, and the output shaft 12 drives the half shaft 20 to rotate, so that the half shaft 20 drives the wheel hub (not shown) of the vehicle 1000 to rotate. For ease of understanding, the embodiment of the present application is described by taking the transmission mechanism 10 as a reducer of an electric drive assembly of a new energy vehicle as an example. Obviously, this is not a limitation of the embodiment of the present application.

[0038] The sealing structure 100 of the embodiment of the present application is formed by extending the output shaft 12 to form an extension section 121, and the extension section 121 is inserted into the through hole 112 opened in the shell 11. The oil seal 30 is sleeved on the extension section 121 and connected to the shell 11, so that the oil seal 30 can cooperate with the extension section 121 and the shell 11 to seal the through hole 112. Since the output shaft 12 and the oil seal 30 are both installed on the shell 11, the concentricity of the oil seal 30 and the output shaft 12 is very high, and the radial runout of the output shaft 12 will also be controlled to be very small, thereby effectively preventing the oil seal 30 from leaking due to the large radial runout of the output shaft 12, thereby reducing the probability of lubricating fluid leakage. In addition, by opening a mounting hole 122 coaxially arranged with the extension section 121 on the extension section 121, the half shaft 20 is inserted into the mounting hole 122 and connected to the output shaft 12 in transmission connection, the coaxiality of the half shaft 20 and the output shaft 12 is also very high, and the radial runout when the output shaft 12 drives the half shaft 20 to rotate is small, thereby further reducing the probability of lubricating fluid leaking from the oil seal 30; and, the mounting hole 122 can accommodate lubricating grease, and the lubricating grease can lubricate the transmission connection between the output shaft 12 and the half shaft 20, thereby reducing the probability of wear of the half shaft 20 and the output shaft 12; further, since the extension section 121 extends into the through hole 112, and the connection between the oil seal 30 and the half shaft 20 and the extension section 121 of the output shaft 12 is relatively simple, the structure of the sealing structure 100 is simple and the cost is low. In addition, the design of the extension section 121 extending into the through hole 112 also facilitates the disassembly and assembly of the oil seal 30 and the half shaft 20.

[0039] Please refer to Figure 3 and Figure 4 In this embodiment, the inner wall of the housing 11 is provided with an assembly protrusion 113, and the through hole 112 passes through the assembly protrusion 113. By providing the assembly protrusion 113, the through hole 112 can have a sufficient installation length while reducing the thickness of the housing 11, thereby helping to reduce the weight and cost of the transmission mechanism 10.

[0040] In this embodiment, the inner wall of the housing 11 is provided with a plurality of first reinforcing ribs 114, and the plurality of first reinforcing ribs 114 are arranged radially with the assembly protrusion 113 as the center. The outer wall of the housing 11 is provided with a plurality of second reinforcing ribs 115, and the plurality of second reinforcing ribs 115 are arranged radially with the through hole 112 as the center. The provision of the first reinforcing ribs 114 and the second reinforcing ribs 115 can improve the structural strength of the housing 11 near the through hole 112, thereby reducing the probability of the output shaft 12 and the half shaft 20 being damaged by the high-speed rotation of the housing 11.

[0041] In this embodiment, the transmission mechanism 10 further includes a connecting member 13, a gear 14 and a first bearing 15. The connecting member 13 is a hub structure, the connecting member 13 is sleeved on the output shaft 12, the gear 14 is connected to the connecting member 13 and is coaxially arranged with the output shaft 12 and the assembly protrusion 113, the first bearing 15 is sleeved on the assembly protrusion 113 and abuts against the inner wall of the gear 14, and the gear 14 is connected to the shaft tooth structure of the transmission mechanism 10.

[0042] When the shaft gear structure drives the gear 14 to rotate, the gear 14 drives the output shaft 12 to rotate through the connecting member 13, and the output shaft 12 drives the half shaft 20 to rotate. Since the output shaft 12 is connected to the housing 11 through the connecting member 13, the gear 14 and the first bearing 15, the radial runout of the output shaft 12 during rotation is only the clearance between the gear 14 and the first bearing 15 (at the end of the figure), and the clearance can be basically controlled below 0.1 mm, so that the radial runout of the output shaft 12 is very small, thereby improving the reliability of the oil seal 30 in preventing leakage.

[0043] In this embodiment, the output shaft 12, the connecting member 13 and the gear 14 are an integrated structure, so that the structural deviation after the output shaft 12, the connecting member 13 and the gear 14 are assembled can be reduced. In some other embodiments, the output shaft 12, the connecting member 13 and the gear 14 can also be a separate structure, which is not specifically limited in the embodiment of the present application.

[0044] In this embodiment, a first limiting groove 1131 is provided at one end of the assembly protrusion 113 extending into the inner cavity 111, a second limiting groove 141 is provided on the inner wall of the gear 14, and the first bearing 15 is located between the first limiting groove 1131 and the second limiting groove 141. The transmission mechanism 10 further includes a first clamping member 16 and a second clamping member 17, the first clamping member 16 is clamped with the first limiting groove 1131, the second clamping member 17 is clamped with the second limiting groove 141, the first clamping member 16 and the second clamping member 17 respectively press both sides of the first bearing 15, and the first clamping member 16 and the second clamping member 17 limit the first bearing 15 from both sides, thereby facilitating the accuracy of installing the first bearing 15. In addition, since the first clamping member 16 and the second clamping member 17 are respectively clamped with the first limiting groove 1131 and the second limiting groove 141, it is convenient to disassemble and assemble the first bearing 15.

[0045] In this embodiment, the first clamping member 16 and the second clamping member 17 are both C-shaped clamping springs, so that the first clamping member 16 and the second clamping member 17 are conveniently clamped with the first limiting groove 1131 and the second limiting groove 141 respectively.

[0046] In this embodiment, the first clamping member 16 abuts against the inner ring 151 of the first bearing 15, and the second clamping member 17 abuts against the outer ring 152 of the first bearing 15 and rotates with the gear 14. Since the assembly protrusion 113 is fixed, the first clamping member 16 is also fixed. By arranging the first clamping member 16 and the second clamping member 17 to abut against the inner ring 151 and the outer ring 152 of the first bearing 15 respectively, it is possible to prevent the first clamping member 16 and the second clamping member 17 from affecting the normal rotation of the first bearing 15 and the gear 14.

[0047] In this embodiment, the extension section 121 extends to the end of the through hole 112 away from the inner cavity 111, and the oil seal 30 is sleeved on the end of the extension section 121 away from the inner cavity 111. Since the end of the through hole 112 away from the inner cavity 111 is close to the outer wall of the housing 11, sleeved on the end of the extension section 121 away from the inner cavity 111, it is convenient to disassemble and assemble the oil seal 30, and it is also convenient to connect the half shaft 20 with the extension section 121.

[0048] In this embodiment, an inner wall of the through hole 112 at one end away from the inner cavity 111 is provided with an installation annular groove 1121, and the oil seal 30 is arranged in the installation annular groove 1121. By providing the installation annular groove 1121, it is convenient to install the oil seal 30; in addition, if the oil seal 30 is connected to the inner wall of the through hole 112, since the oil seal 30 has a certain thickness, the gap between the extension section 121 and the inner wall of the through hole 112 will be large, and a large amount of lubricating fluid flowing into the extension section 121 and the inner wall of the through hole 112 will exert a large pressure on the oil seal 30, which is not conducive to the sealing effect of the oil seal 30. By arranging the oil seal 30 in the installation annular groove 1121, the size of the gap between the extension section 121 and the inner wall of the through hole 112 can be reduced, thereby reducing the amount of lubricating fluid flowing into the extension section 121 and the inner wall of the through hole 112, which is conducive to improving the sealing effect of the sealing structure 100.

[0049] In this embodiment, the sealing structure 100 further includes a dust cover 40, which is sleeved on the half shaft 20, and is located on the side of the oil seal 30 away from the inner cavity 111 and abuts against the oil seal 30. By providing the dust cover 40, dust can be effectively prevented from entering the oil seal 30 and affecting the sealing effect of the oil seal 30.

[0050] In some other embodiments, the extension section 121 may be appropriately extended, and the dust cover 40 may be sleeved on the end of the extension section 121 away from the inner cavity 111, and the dust cover 40 may be located on the side of the oil seal 30 away from the inner cavity 111 and abut against the oil seal 30. Then, the dust cover 40 may also effectively prevent dust from entering the oil seal 30 and affecting the sealing effect of the oil seal 30. The embodiments of the present application do not make specific limitations on this.

[0051] It should be noted that if the extension section 121 is appropriately extended and the dust cover 40 is mounted on the end of the extension section 121 away from the inner cavity 111, the output shaft 12 may be too long and cause processing deformation. Therefore, it is necessary to use high-precision processing equipment to ensure the processing accuracy of the output shaft 12.

[0052] In this embodiment, the oil seal 30 includes a main lip 31 and a dust lip 32. The main lip 31 is sleeved on one end of the extension section 121 away from the inner cavity 111 and connected to the housing 11. The dust lip 32 is provided on the main lip 31 and abuts against the dust cover 40. Specifically, the main lip 31 cooperates with the extension section 121 and the housing 11 to prevent the lubricating liquid from leaking from the through hole 112, and the dust lip 32 cooperates with the dust cover 40 to prevent dust from entering the oil seal 30, thereby facilitating improving the sealing effect of the sealing structure 100.

[0053] In this embodiment, the half shaft 20 includes an optical axis section 22 and a transmission section 23 connected to each other. The optical axis section 22 and the transmission section 23 are both inserted into the mounting hole 122. The optical axis section 22 is located on the side of the transmission section 23 away from the inner cavity 111. The transmission section 23 is in transmission connection with the output shaft 12. A groove 221 is provided on the peripheral side wall of the optical axis section 22. The sealing structure 100 also includes a sealing ring 50, which is disposed in the groove 221 and abuts against the inner wall of the mounting hole 122. The mounting hole 122 is used to receive lubricating grease, and the sealing ring 50 is used to limit the leakage of lubricating grease. By arranging lubricating grease in the mounting hole 122, the transmission section 23 and the transmission part of the output shaft 12 can be lubricated, thereby reducing the probability of wear of the half shaft 20 and the output shaft 12; by arranging the sealing ring 50 to limit the leakage of lubricating grease, the lubricating effect of the lubricating grease on the transmission section 23 and the transmission part of the output shaft 12 can be ensured, the frequency of adding lubricating grease can be reduced, and the maintenance cost can be reduced; by arranging the sealing ring 50 in the groove 221 opened on the peripheral side wall of the optical axis section 22, the axial movement of the sealing ring 50 along the optical axis section 22 can be effectively avoided, thereby ensuring the sealing effect of the sealing ring 50.

[0054] In this embodiment, there is a certain gap between the optical axis section 22 and the inner wall of the mounting hole 122, so as to facilitate the insertion of the optical axis section 22 and the transmission section 23 into the mounting hole 122 and to facilitate the heat dissipation of the heat generated by the transmission section 23 and the output shaft 12.

[0055] Please refer to further Figure 5 In this embodiment, the transmission section 23 is provided with an external spline 232, and the mounting hole 122 is provided with an internal spline 1222. The transmission section 23 is transmission-connected to the output shaft 12 through the cooperation of the external spline 232 and the internal spline 1222.

[0056] Please refer again Figure 2 , Figure 3 and Figure 4In this embodiment, the half shaft 20 further includes a connecting section 21, which is connected to the optical axis section 22 and is located on the side of the optical axis section 22 away from the transmission section 23. The cross-sectional dimensions of the connecting section 21 are larger than the cross-sectional dimensions of the optical axis section 22 and the transmission section 23. The dust cover 40 is sleeved on the optical axis section 22 and abuts against the connecting section 21. When the half shaft 20 is connected to the extension section 121, the connecting section 21 presses the dust cover 40 against the dust lip 32, thereby facilitating improving the tightness of the connection between the dust cover 40 and the dust lip 32.

[0057] Please refer to Figure 5 In this embodiment, the inner wall of the mounting hole 122 is provided with a first slot 1221, and the peripheral side wall of the transmission section 23 is provided with a second slot 231 which is arranged opposite to the first slot 1221. The sealing structure 100 further includes a clamping member 60, which is clamped in the first slot 1221 and the second slot 231. The clamping member 60 is used to prevent the optical axis section 22 and the transmission section 23 from escaping from the mounting hole 122. In this way, when the half shaft 20 is connected to the extension section 121, it is only necessary to clamp the clamping member 60 with the second slot 231, and then the clamping member 60 moves with the transmission section 23 and moves into the first slot 1221, thereby facilitating the convenience of connecting the half shaft 20 with the extension section 121.

[0058] In this embodiment, the clamping member 60 may be a C-shaped clamping spring, which is helpful to improve the convenience of clamping the clamping member 60 with the first clamping slot 1221 and the second clamping slot 231.

[0059] Please refer again Figure 2 , Figure 3 and Figure 4 In this embodiment, the mounting hole 122 is connected to the inner cavity 111, and the sealing structure 100 further includes a plug 70, which is arranged at one end of the mounting hole 122 close to the inner cavity 111 to limit the lubricating fluid in the inner cavity 111 from entering the mounting hole 122. By setting the mounting hole 122 to be connected to the inner cavity 111, that is, the mounting hole 122 passes through both ends of the output shaft 12, it is convenient to process the mounting hole 122; in addition, by setting the plug 70 to block one end of the mounting hole 122 close to the inner cavity 111, since the shaft gear structure in the housing 11 generates a lot of debris during transmission, the plug 70 can effectively prevent the lubricating fluid in the housing 11 from carrying debris into the mounting hole 122 to affect the transmission connection between the half shaft 20 and the output shaft 12.

[0060] Please refer to Figure 5In this embodiment, a stop step 1223 is protruded from the inner wall of the mounting hole 122 at one end close to the inner cavity 111 and a clamping groove 1224 is opened. The stop step 1223 is located on the side of the clamping groove 1224 away from the inner cavity 111, and the plug 70 abuts against the stop step 1223. The sealing structure 100 also includes a pressing member 80, which is clamped with the clamping groove 1224 and abuts against the side of the plug 70 away from the stop step 1223. The pressing member 80 is used to press the plug 70 against the stop step 1223. In this way, when installing the plug 70, the plug 70 is installed in the mounting hole 122 and abutted against the stopping step 1223. The stopping step 1223 stops the plug 70 from one side, and then the pressing piece 80 is engaged with the clamping groove 1224 and presses the plug 70 from the other side. The stopping step 1223 and the pressing piece 80 cooperate to limit the two sides of the plug 70, which is beneficial to improve the accuracy and convenience of installing the plug 70.

[0061] In this embodiment, the pressing member 80 may be a C-shaped retaining spring, which is helpful to improve the convenience of the clamping of the pressing member 80 and the retaining groove 1224.

[0062] In this embodiment, the plug 70 includes a plug cover 71 and a second bearing 72. The plug cover 71 abuts against the stop step 1223, and the plug cover 71 is interference fit with the inner wall of the mounting hole 122. The second bearing 72 is arranged between the plug cover 71 and the holding member 80. A drive motor (not shown) is also arranged in the housing 11, and the second bearing 72 is also sleeved on the drive shaft of the drive motor (not shown). By providing the second bearing 72, the movement of the drive shaft of the drive motor and the movement of the output shaft 12 do not affect each other, and a part of the drive shaft of the drive motor can also be received in the mounting hole 122, which is conducive to reducing the size of the transmission mechanism 10.

[0063] In some other embodiments, the plug 70 may only include the plug cover 71 , and the holding member 80 directly presses the plug cover 71 onto the stopping step 1223 , which is not specifically limited in the embodiments of the present application.

[0064] In summary, the sealing structure 100 of the embodiment of the present application extends the output shaft 12 to form an extension section 121, and the extension section 121 is inserted into the through hole 112 opened in the shell 11, and the oil seal 30 is sleeved on the extension section 121 and connected to the shell 11, so that the oil seal 30 can cooperate with the extension section 121 and the shell 11 to seal the through hole 112. Since the output shaft 12 and the oil seal 30 are both installed on the shell 11, the concentricity of the oil seal 30 and the output shaft 12 is very high, and the radial runout of the output shaft 12 will also be controlled to be very small, thereby effectively avoiding the oil seal 30 from leaking due to the large radial runout of the output shaft 12, thereby reducing the probability of lubricating fluid leakage. In addition, by opening a mounting hole 122 coaxially arranged with the extension section 121 on the extension section 121, the half shaft 20 is inserted into the mounting hole 122 and connected to the output shaft 12 in transmission connection, the coaxiality of the half shaft 20 and the output shaft 12 is also very high, and the radial runout when the output shaft 12 drives the half shaft 20 to rotate is small, thereby further reducing the probability of lubricating fluid leaking from the oil seal 30; and, the mounting hole 122 can accommodate lubricating grease, and the lubricating grease can lubricate the transmission connection between the output shaft 12 and the half shaft 20, thereby reducing the probability of wear of the half shaft 20 and the output shaft 12; further, since the extension section 121 extends into the through hole 112, and the connection between the oil seal 30 and the half shaft 20 and the extension section 121 of the output shaft 12 is relatively simple, the structure of the sealing structure 100 is simple and the cost is low. In addition, the design of the extension section 121 extending into the through hole 112 also facilitates the disassembly and assembly of the oil seal 30 and the half shaft 20.

[0065] Please refer to Figure 6 The embodiment of the present application also provides a car 1000, including the above-mentioned sealing structure 100. By providing the sealing structure 100, the probability of lubricating fluid leakage and the probability of wear of the half shaft 20 and the output shaft 12 are reduced; in addition, since the sealing structure 100 has a simple structure and low cost, the cost of the car 1000 can also be reduced.

[0066] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A sealing structure, characterized in that: include: The transmission mechanism comprises a housing and an output shaft, wherein the housing has an inner cavity and the housing is provided with a through hole communicating with the inner cavity; The output shaft is arranged in the inner cavity, and the output shaft has an extension section inserted into the through hole, and a mounting hole coaxially arranged with the extension section is opened on a side of the extension section away from the inner cavity; A half shaft, inserted into the mounting hole and drivingly connected to the output shaft; An oil seal is sleeved on the extension section and connected to the housing.

2. The sealing structure according to claim 1, characterized in that: The extension section extends to an end of the through hole away from the inner cavity, and the oil seal sleeve is arranged at an end of the extension section away from the inner cavity.

3. The sealing structure according to claim 2, characterized in that: An inner wall of the through hole at one end away from the inner cavity is provided with a mounting ring groove, and the oil seal is arranged in the mounting ring groove.

4. The sealing structure according to claim 2, characterized in that: The sealing structure also includes a dust cover, which is sleeved on one end of the half shaft or the extension section away from the inner cavity, and the dust cover is located on a side of the oil seal away from the inner cavity and abuts against the oil seal.

5. The sealing structure according to claim 4, characterized in that: The oil seal comprises a main lip and a dust lip. The main lip is sleeved on one end of the extension section away from the inner cavity and connected to the housing. The dust lip is arranged on the main lip and abuts against the dust cover.

6. The sealing structure according to claim 2, characterized in that: The half-shaft includes an optical axis section and a transmission section connected to each other, the optical axis section and the transmission section are both inserted into the mounting hole, the optical axis section is located on the side of the transmission section away from the inner cavity, the transmission section is connected to the output shaft in transmission, a groove is provided on the peripheral side wall of the optical axis section, the sealing structure also includes a sealing ring, the sealing ring is provided in the groove and abuts against the inner wall of the mounting hole, the mounting hole is used to receive lubricating grease, and the sealing ring is used to limit the leakage of the lubricating grease.

7. The sealing structure according to claim 6, characterized in that: A first slot is formed on the inner wall of the mounting hole, and a second slot is formed on the peripheral side wall of the transmission section opposite to the first slot. The sealing structure also includes a clamping member, which is clamped in the first slot and the second slot, and is used to limit the optical axis section and the transmission section from escaping from the mounting hole.

8. The sealing structure according to claim 1, characterized in that: The mounting hole is communicated with the inner cavity, and the sealing structure further comprises a plug, which is arranged at one end of the mounting hole close to the inner cavity to limit the lubricating fluid in the inner cavity from entering the mounting hole.

9. The sealing structure according to claim 8, characterized in that: The inner wall of the mounting hole at one end close to the inner cavity is provided with a stop step and a clamping groove, the stop step is located on the side of the clamping groove away from the inner cavity, the plug abuts against the stop step, and the sealing structure also includes a pressing member, the pressing member is clamped with the clamping groove and abuts against the side of the plug away from the stop step, and the pressing member is used to press the plug against the stop step.

10. An automobile, characterized in that: The invention comprises the sealing structure as claimed in any one of claims 1 to 9.

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