Sealing structure of output shaft of gearbox and gearbox

Abstract

The utility model provides a sealing structure of an output shaft of a gear box and the gear box, the sealing structure comprises a front end cover and a sealing piece, the front end cover is provided with a sealing side and a mounting side which are deviated from each other, and the mounting side is used for being connected with a box body of the gear box; the mounting side is concavely provided with a mounting groove, and the bottom wall of the mounting groove is provided with a shaft hole penetrating through the sealing side; an output shaft of the gearbox penetrates through the shaft hole and the mounting groove; the sealing piece is provided with a center hole penetrating through the sealing piece. The sealing piece is arranged in the mounting groove and is attached to the bottom wall of the mounting groove; the hole wall of the center hole extends in the center direction of the center hole and protrudes in the direction of the installation side to form an abutting ring. The abutting ring is provided with an abutting hole, and the output shaft penetrates through the abutting hole. The sealing structure can achieve the effects of sealing and reducing heat generated by friction.

Description

TECHNICAL FIELD

[0001] The utility model relates to power equipment technical field especially is related to a sealing structure and gear box of output shaft of gear box. BACKGROUND

[0002] At present, the micro planetary gear box with small volume and high rotating speed is applied more and more widely, such as robot, medical instrument and the like. The micro planetary gear box is combined with micro motor, and can be used as a kind of prime mover in a variety of scenes with strict space requirement and high rotating speed output requirement. The sealing structure of prior art has larger contact area with output shaft, and the friction generates heat more intensely, so that the temperature rise is too high, which leads to that medical instrument cannot be used by doctor hand, and does not satisfy the basic requirement of application scene. In the existing medical industry application scene, the gear box needs to be sterilized before use, and vacuum and high-temperature steam environment are generated in the sterilization process. Once the external water vapor enters the inside of gear box in the sterilization process, the performance of lubricating medium between gears is affected, and gears are caused to fail prematurely. Therefore, the sealing structure with good sealing effect and effectively avoiding friction heat generation is required in the field. SUMMARY

[0003] The utility model discloses in view of prior art's insufficient, realized the sealing effect is good, and can effectively avoid the effect of friction heat generation.

[0004] On the one hand, the utility model provides a kind of sealing structure of the output shaft of gear box, comprising:

[0005] Front end cover has the sealing side and installation side that are away from each other, and the installation side is used to connect with the box body of gear box;Installation side recess is provided with installation groove, and the bottom wall of installation groove is provided with shaft hole that penetrates the sealing side;The shaft hole and the installation groove are used for the output shaft of gear box to pass through;

[0006] Sealing element has the center hole that penetrates the sealing element;Sealing element is located in the installation groove, and is attached to the bottom wall of installation groove;The hole wall of center hole extends towards the center direction of center hole and is raised towards the direction of installation side to form abutting ring;The abutting ring has abutting hole, and the abutting hole is used for the output shaft to pass through.

[0007] Further, the outer wall of the sealing element is provided with a positioning ring groove, and a sealing ring is arranged in the positioning ring groove;The side of the sealing ring away from the sealing element is closely abutted on the side wall of the installation groove.

[0008] Further, it further includes sealing lock ring, and the sealing lock ring has through-hole for the output shaft to pass through;The sealing lock ring is attached to the side of the sealing element facing the installation side, and the outer periphery of the sealing lock ring is closely matched with the side wall of the installation side.

[0009] Further, the abutting ring comprises a connecting part and an abutting part, two ends of the connecting part are connected with the hole wall of the center hole and the abutting part respectively, and the abutting part is provided with the abutting hole; wherein the connecting part abuts against the bottom wall of the mounting groove.

[0010] In another aspect, the application further provides a gear box, comprising:

[0011] a box body provided with an output shaft;

[0012] The sealing structure of the output shaft of the gear box as described above, the mounting side of the front end cover of the sealing structure is connected with the box body, and the output shaft is arranged in the mounting hole, the abutting hole and the shaft hole of the sealing structure.

[0013] Further, the box body comprises:

[0014] a gear ring provided with a gear cavity; the cavity wall of the gear cavity is provided with a gear part; the mounting side is connected with the gear ring to cover the gear cavity;

[0015] an output assembly arranged in the gear cavity and engaged with the gear part; the output assembly is provided with the output shaft.

[0016] Further, it further comprises an input device arranged in the gear cavity, and the output end of the input device is connected with one end of the output assembly away from the output shaft;

[0017] wherein the input device comprises at least one input assembly, when the input assembly is multiple, the multiple input assemblies are connected in sequence; each input assembly is engaged with the gear part.

[0018] Further, the input assembly comprises a first sun gear, a plurality of first planet gears and a first planet carrier; the plurality of first planet gears are engaged with the outer periphery of the first sun gear at intervals; and each first planet gear is engaged with the gear part; the first planet carrier is located on the side of the first sun gear facing the sealing structure; each first planet gear is connected with the first planet carrier.

[0019] Further, the output assembly comprises a second sun gear, a plurality of second planet gears and a second planet carrier; the second sun gear is connected with the first planet carrier and extends towards the side away from the first sun gear; the plurality of second planet gears are engaged with the outer periphery of the second sun gear at intervals, and each second planet gear is engaged with the gear part; the second planet carrier is located on the side of the second sun gear away from the first sun gear; each second planet gear is connected with the second planet carrier; the side of the second planet carrier away from the second sun gear is provided with the output shaft.

[0020] Further, a bearing seat is arranged between the gear ring and the front end cover, and a bearing is arranged in the bearing seat and sleeved on the output shaft.

[0021] Further, a first friction plate is sleeved on the second sun gear and arranged between the first carrier and the second planetary gear.

[0022] Further, a second friction plate is sleeved on the first sun gear and arranged on a side of the first planetary gear away from the first carrier.

[0023] Further, a third friction plate is arranged at a joint of two adjacent input assemblies.

[0024] Compared with the prior art, the application has the following beneficial effects:

[0025] In the technical scheme, the front end cover provides a mounting position and positioning for the sealing element, and when the mounting side of the front end cover is connected with the box body of the gear box, the output shaft of the gear box is arranged through the mounting hole and the shaft hole of the front end cover, and the output shaft is arranged through the abutting hole of the abutting ring on the sealing element. The sealing element is sealed and abutted with the peripheral wall of the output shaft through the hole wall of the abutting hole, thereby playing a sealing effect, and good sealing effect can be achieved. Meanwhile, the design of the abutting ring reduces the area of the sealing connection between the sealing structure and the output shaft, thereby reducing the heat generated by friction. Therefore, the application can effectively prevent water vapor generated in the sterilization process from entering the inside of the gear box to greatly reduce the service life of the gear, and the heat generated by the sealing element is controlled, and the structure is simple. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present application or the technical scheme in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0027] Figure 1 FIG. 1 is a sectional view of a gear box according to an embodiment of the present application;

[0028] Figure 2 FIG. 2 is an enlarged view of a part of FIG. 1; Figure 1

[0029] Figure 3 FIG. 3 is a structural schematic view of a gear box according to an embodiment of the present application;

[0030] ​Figure 4 For Figure 1 Part structure diagram of inside of the gear box.

[0031] Marked as in the drawings:

[0032] Sealing structure 100,

[0033] Front end cover 1, sealing side 1a, mounting side 1b, mounting groove 1c, shaft hole 1d,

[0034] Seal 2, center hole 2a, abutting ring 21, abutting hole 21a, connecting part 211, abutting part 212, positioning ring groove 2b, sealing ring 22,

[0035] Sealing lock ring 3, via 3a,

[0036] Gear box 1000, box 4, gear ring 41, tooth cavity 41a, input assembly 42, first sun gear 421, first planetary gear 422, first planet carrier 423, output assembly 43, second sun gear 431, second planetary gear 432, second planet carrier 433, bearing seat 44, bearing 45, first friction plate 46, second friction plate 47, output shaft 5, first pin shaft 61, second pin shaft 62. DETAILED DESCRIPTION

[0037] The technical scheme of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0039] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] As shown in Figure 1 and Figure 2 The present application provides a sealing structure 100 of an output shaft of a gear box, comprising a front end cover 1 and a sealing member 2, the front end cover 1 has a sealing side 1a and a mounting side 1b facing away from each other, the mounting side 1b is used to connect with a box body 4 of the gear box 1000; the mounting side 1b is recessed with a mounting groove 1c, the bottom wall of the mounting groove 1c is provided with a shaft hole 1d penetrating the sealing side 1a; the shaft hole 1d and the mounting groove 1c are used for the output shaft 5 of the gear box 1000 to pass through; the sealing member 2 has a center hole 2a penetrating the sealing member 2; the sealing member 2 is arranged in the mounting groove 1c and is attached to the bottom wall of the mounting groove 1c; the hole wall of the center hole 2a extends towards the center direction of the center hole 2a and protrudes towards the direction of the mounting side 1b to form an abutting ring 21; the abutting ring 21 has an abutting hole 21a for the output shaft 5 to pass through.

[0041] It can be understood that the front end cover 1 provides a mounting position and positioning for the sealing member 2, when the mounting side 1b of the front end cover 1 is connected with the box body 4 of the gear box 1000, the output shaft 5 of the gear box 1000 passes through the mounting hole and the shaft hole 1d of the front end cover 1, and the output shaft 5 passes through the abutting hole 21a of the abutting ring 21 on the sealing member 2; the sealing member 2 is sealed and abutted with the peripheral wall of the output shaft 5 through the hole wall of the abutting hole 21a, which plays a sealing role and can achieve good sealing effect, at the same time, the design of the abutting ring 21 reduces the area of the sealing connection between the sealing structure 100 and the output shaft 5, which can reduce the heat generated by friction. Therefore, the present application can effectively prevent the water vapor generated in the sterilization process from entering the inside of the gear box 1000 to cause the gear life to be greatly reduced, and the heat caused by the sealing member 2 is controlled, and the structure is simple.

[0042] As shown in Figure 2As shown in the technical solution of this application embodiment, the outer wall of the seal 2 is provided with a positioning ring groove 2b, and a sealing ring 22 is provided in the positioning ring groove 2b; the side of the sealing ring 22 away from the seal 2 is tightly abutted against the side wall of the mounting groove 1c.

[0043] Understandably, the positioning groove 2b provides an installation and positioning position for the sealing ring 22. The sealing ring 22 fits tightly against the side wall of the mounting groove 1c, which improves the sealing performance.

[0044] In this embodiment, the sealing ring 22 is an O-ring. An oil seal skeleton is also provided inside the sealing element 2. The sealing ring 22, the sealing element 2, and the oil seal skeleton are press-fitted to form a composite sealing assembly.

[0045] like Figure 1 and Figure 2 As shown, the technical solution of this application embodiment also includes a sealing locking ring 3, which has a through hole 3a for the output shaft 5 to pass through; the sealing locking ring 3 is attached to the side of the seal 2 facing the mounting side 1b, and the outer periphery of the sealing locking ring 3 is tightly fitted with the side wall of the mounting side 1b.

[0046] Understandably, the sealing locking ring 3 provides axial positioning for the seal 2, improving the positional stability of the seal 2 and ensuring stable sealing performance. This also ensures the position of the seal 2 within the overall structure, preventing axial movement and mitigating the adverse effects of the application environment on the gearbox 1000. Furthermore, it is easy to manufacture, reliably connected, and has a simple structure.

[0047] like Figure 2 As shown, in the technical solution of this application embodiment, the contact area between the seal 2 and the sealing locking ring 3 is smaller than the contact area between the seal 2 and the bottom wall of the mounting groove 1c. This reduces the impact of the sealing locking ring 3 on the output shaft 5 and improves the stability of the seal 2.

[0048] The part of the seal 2 that contacts the bottom wall of the mounting groove 1c is made of plastic; the part of the seal 2 that contacts the sealing locking ring 3 is also made of plastic.

[0049] like Figure 2 As shown, in the technical solution of this application embodiment, the abutment ring 21 includes a connecting part 211 and an abutment part 212. The two ends of the connecting part 211 are respectively connected to the hole wall of the central hole 2a and the abutment part 212. The abutment part 212 has an abutment hole 21a. The connecting part 211 abuts against the bottom wall of the mounting groove 1c.

[0050] Understandably, the connecting part 211 serves as a connection and support for the abutting part 212. The design of the abutting part 212 can reduce the contact area between the abutting ring 21 and the output shaft 5, reduce frictional heat generation, and at the same time ensure sealing performance.

[0051] As Figure 2 shown, in the technical scheme of the embodiment of the present application, the connection between the abutment part 212 and the connecting part 211 is arc-shaped transition. In this way, the connection stability and strength of the connecting part 211 and the abutment part 212 can be improved, and the service life of the abutment part 212 can be improved.

[0052] On the other hand, the present application also provides a gear box 1000, comprising a box body 4 and the sealing structure 100 of the output shaft of the gear box as above: since the gear box 1000 adopts the specific structure of all the embodiments of the sealing structure 100 of the output shaft of the gear box as above, the gear box 1000 has all the beneficial effects of the above-mentioned embodiments, which will not be repeated here. Wherein, the box body 4 is provided with an output shaft 5; the mounting side 1b of the front end cover 1 of the sealing structure 100 is connected with the box body 4, and the output shaft 5 is arranged in the mounting hole, the abutment hole 21a and the shaft hole 1d of the sealing structure 100.

[0053] In an embodiment, in the technical scheme of the embodiment of the present application, the box body 4 comprises a gear ring 41 and an output assembly 43, the output assembly 43 is located in a gear cavity 41a and comprises a second sun gear 431, a plurality of second planetary gears 432 and a second planet carrier 433; the plurality of second planetary gears 432 are arranged in the outer periphery of the second sun gear 431 in a spaced manner, and each second planetary gear 432 is in meshing engagement with the gear part; each second planetary gear 432 is connected with the second planet carrier 433; the second planet carrier 433 is provided with the output shaft 5 on the side away from the second sun gear 431.

[0054] It can be understood that a one-stage planetary gear structure is formed through the above structure, the second sun gear 431 can be connected with the output end of the motor and rotate under the driving of the motor, the output assembly 43 plays a role of adjusting the rotating speed and transmitting the torque, and the required rotating speed is output through the output shaft 5 after the transmission of the input assembly 42 and the output assembly 43, so as to achieve the purpose of speed reduction.

[0055] As Figure 1 , Figure 3 and Figure 4As shown, in the technical scheme of the embodiment of the present application, the box 4 comprises a ring gear 41, an input assembly 42 and an output assembly 43, the ring gear 41 has a gear cavity 41a; the cavity wall of the gear cavity 41a is provided with a gear part; the mounting side 1b is connected with the ring gear 41 to cover the gear cavity 41a; the input assembly 42 is located in the gear cavity 41a and comprises a first sun gear 421, a plurality of first planet gears 422 and a first planet carrier 423; the plurality of first planet gears 422 are meshed at intervals on the outer periphery of the first sun gear 421; and each first planet gear 422 is meshed with the gear part; the first planet carrier 423 is located on the side of the first sun gear 421 facing the sealing structure 100; each first planet gear 422 is connected with the first planet carrier 423; the output assembly 43 is located in the gear cavity 41a and comprises a second sun gear 431, a plurality of second planet gears 432 and a second planet carrier 433; the second sun gear 431 is connected with the first planet carrier 423 and extends towards the side away from the first sun gear 421; the plurality of second planet gears 432 are meshed at intervals on the outer periphery of the second sun gear 431, and each second planet gear 432 is meshed with the gear part; the second planet carrier 433 is located on the side of the second sun gear 431 away from the first sun gear 421; each second planet gear 432 is connected with the second planet carrier 433; the side of the second planet carrier 433 away from the second sun gear 431 is provided with an output shaft 5.

[0056] It can be understood that the two-stage planetary gear structure is formed by the above structure, the first sun gear 421 can be connected with the output end of the motor and rotate under the driving of the motor, the input assembly 42 and the output assembly 43 play the role of adjusting the rotating speed and transmitting the torque, the required rotating speed is output through the output shaft 5 after the transmission of the input assembly 42 and the output assembly 43, and the purpose of speed reduction is achieved, the two-stage planetary gear speed reduction structure of the present application is compact in structure, high in transmission efficiency and strong in carrying capacity.

[0057] Among them, the first planet gear 422 is connected with the first planet carrier 423 through the first pin shaft 61, and the second planet gear 432 is connected with the second planet carrier 433 through the second pin shaft 62.

[0058] In some other embodiments, the input assembly can also be provided as a plurality of input assemblies, the plurality of input assemblies are connected in sequence, and each input assembly is located in the gear cavity 41a and comprises a first sun gear 421, a plurality of first planet gears 422 and a first planet carrier 423; the plurality of first planet gears 422 are meshed at intervals on the outer periphery of the first sun gear 421; and each first planet gear 422 is meshed with the gear part; the first planet carrier 423 is located on the side of the first sun gear 421 facing the sealing structure 100; each first planet gear 422 is connected with the first planet carrier 423.

[0059] It can be understood that by setting multiple input assemblies, a multi-stage planetary gear reduction structure can be realized.

[0060] Exemplarily, the N-stage planetary gear reduction structure includes an output assembly and (N-1) input assemblies, where N is an integer greater than or equal to 1.

[0061] As shown in Figure 1 , Figure 3 and Figure 4 , in the technical scheme of the embodiment of the present application, a bearing seat 44 is located between the ring gear 41 and the front end cover 1, and a bearing 45 is located in the bearing seat 44 and sleeved on the output shaft 5.

[0062] It can be understood that the bearing seat 44 and the bearing 45 provide mounting, positioning and supporting functions. In the embodiment, the number of bearings 45 is two, and the two bearings 45 are arranged in a spaced manner. In the embodiment, the bearing 45 can be a ball bearing 45.

[0063] As shown in Figure 1 and Figure 4 , in the technical scheme of the embodiment of the present application, a first friction plate 46 is sleeved on the second sun gear 431 and located between the first planet carrier 423 and the second planet gear 432. In this way, the first friction plate 46 plays a separating and isolating role, and can avoid mutual influence between the first planet carrier 423 and the second planet gear 432. The first friction plate 46 can also play an axial limiting role, improving the positional stability of the input assembly 42 and the output assembly 43.

[0064] A second friction plate 47 is also included, which is sleeved on the first sun gear 421 and located on the side of the first planet gear 422 away from the first planet carrier 423.

[0065] It can be understood that in this way, the second friction plate 47 plays a separating and isolating role, and can avoid mutual influence between the second planet gear 432 and the motor. The first friction plate 46 can also play an axial limiting role, improving the positional stability of the input assembly 42.

[0066] When the input assembly is multiple, the third friction plate is arranged at the connection between two adjacent input assemblies. It can play a separating and isolating role.

[0067] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sealing arrangement (100) for an output shaft of a gear box, characterized in that, The front end cover (1) has a sealing side (1a) and a mounting side (1b) facing away from each other, the mounting side (1b) is used for connecting with the box body (4) of the gear box (1000); the mounting side (1b) is concavely provided with a mounting groove (1c), the bottom wall of the mounting groove (1c) is provided with a shaft hole (1d) penetrating the sealing side (1a); the shaft hole (1d) and the mounting groove (1c) are used for the output shaft (5) of the gear box (1000) to pass through; The sealing element (2) has a center hole (2a) penetrating the sealing element (2); the sealing element (2) is arranged in the mounting groove (1c) and is attached to the bottom wall of the mounting groove (1c); the hole wall of the center hole (2a) extends towards the center direction of the center hole (2a) and protrudes towards the direction of the mounting side (1b) to form an abutting ring (21); the abutting ring (21) has an abutting hole (21a) for the output shaft (5) to pass through. The outer wall of the sealing element (2) is provided with a positioning ring groove (2b), and a sealing ring (22) is arranged in the positioning ring groove (2b); the side of the sealing ring (22) away from the sealing element (2) is tightly abutted against the side wall of the mounting groove (1c).

2. The seal arrangement (100) of the output shaft of a gear box according to claim 1, characterized in that Further comprising a sealing locking ring (3), the sealing locking ring (3) has a through hole (3a) for the output shaft (5) to pass through; the sealing locking ring (3) is attached to the side of the sealing element (2) facing the mounting side (1b), and the outer periphery of the sealing locking ring (3) is tightly matched with the side wall of the mounting side (1b).

3. The seal arrangement (100) of the output shaft of a gear box according to claim 1, characterized in that The abutting ring (21) comprises a connecting part (211) and an abutting part (212), the two ends of the connecting part (211) are respectively connected to the hole wall of the center hole (2a) and the abutting part (212), and the abutting part (212) has the abutting hole (21a); wherein the connecting part (211) is abutted against the bottom wall of the mounting groove (1c).

4. The seal arrangement (100) of the output shaft of a gear box according to claim 1, characterized in that The front end cover (1) has a sealing side (1a) and a mounting side (1b) facing away from each other, the mounting side (1b) is used for connecting with the box body (4) of the gear box (1000); the mounting side (1b) is concavely provided with a mounting groove (1c), the bottom wall of the mounting groove (1c) is provided with a shaft hole (1d) penetrating the sealing side (1a); the shaft hole (1d) and the mounting groove (1c) are used for the output shaft (5) of the gear box (1000) to pass through; 5. A gearbox (1000) characterized in that, The sealing element (2) has a center hole (2a) penetrating the sealing element (2); the sealing element (2) is arranged in the mounting groove (1c) and is attached to the bottom wall of the mounting groove (1c); the hole wall of the center hole (2a) extends towards the center direction of the center hole (2a) and protrudes towards the direction of the mounting side (1b) to form an abutting ring (21); the abutting ring (21) has an abutting hole (21a) for the output shaft (5) to pass through. The outer wall of the sealing element (2) is provided with a positioning ring groove (2b), and a sealing ring (22) is arranged in the positioning ring groove (2b); the side of the sealing ring (22) away from the sealing element (2) is tightly abutted against the side wall of the mounting groove (1c). Further comprising a sealing locking ring (3), the sealing locking ring (3) has a through hole (3a) for the output shaft (5) to pass through; the sealing locking ring (3) is attached to the side of the sealing element (2) facing the mounting side (1b), and the outer periphery of the sealing locking ring (3) is tightly matched with the side wall of the mounting side (1b).

6. The gearbox (1000) according to claim 5, characterized in that The abutting ring (21) comprises a connecting part (211) and an abutting part (212), the two ends of the connecting part (211) are respectively connected to the hole wall of the center hole (2a) and the abutting part (212), and the abutting part (212) has the abutting hole (21a); wherein the connecting part (211) is abutted against the bottom wall of the mounting groove (1c). The front end cover (1) has a sealing side (1a) and a mounting side (1b) facing away from each other, the mounting side (1b) is used for connecting with the box body (4) of the gear box (1000); the mounting side (1b) is concavely provided with a mounting groove (1c), the bottom wall of the mounting groove (1c) is provided with a shaft hole (1d) penetrating the sealing side (1a); the shaft hole (1d) and the mounting groove (1c) are used for the output shaft (5) of the gear box (1000) to pass through; The sealing element (2) has a center hole (2a) penetrating the sealing element (2); the sealing element (2) is arranged in the mounting groove (1c) and is attached to the bottom wall of the mounting groove (1c); the hole wall of the center hole (2a) extends towards the center direction of the center hole (2a) and protrudes towards the direction of the mounting side (1b) to form an abutting ring (21); the abutting ring (21) has an abutting hole (21a) for the output shaft (5) to pass through.

7. The gearbox (1000) according to claim 6, characterized in that The outer wall of the sealing element (2) is provided with a positioning ring groove (2b), and a sealing ring (22) is arranged in the positioning ring groove (2b); the side of the sealing ring (22) away from the sealing element (2) is tightly abutted against the side wall of the mounting groove (1c). Further comprising a sealing locking ring (3), the sealing locking ring (3) has a through hole (3a) for the output shaft (5) to pass through; the sealing locking ring (3) is attached to the side of the sealing element (2) facing the mounting side (1b), and the outer periphery of the sealing locking ring (3) is tightly matched with the side wall of the mounting side (1b). The abutting ring (21) comprises a connecting part (211) and an abutting part (212), the two ends of the connecting part (211) are respectively connected to the hole wall of the center hole (2a) and the abutting part (212), and the abutting part (212) has the abutting hole (21a); wherein the connecting part (211) is abutted against the bottom wall of the mounting groove (1c). The input device comprises at least one input component, and when the input components are multiple, the multiple input components are connected in sequence.

8. The gearbox (1000) according to claim 7, characterized in that The input component comprises a first sun gear (421), multiple first planetary gears (422), and a first planetary carrier (423). The multiple first planetary gears (422) are meshed at intervals on the outer periphery of the first sun gear (421), and each first planetary gear (422) is meshed with the tooth portion. The first planetary carrier (423) is located on the side of the first sun gear (421) facing the sealing structure (100). Each first planetary gear (422) is connected with the first planetary carrier (423).

9. The gearbox (1000) according to claim 8, characterized in that The output component comprises a second sun gear (431), multiple second planetary gears (432), and a second planetary carrier (433). The second sun gear (431) is connected with the first planetary carrier (423) and extends towards the side away from the first sun gear (421). The multiple second planetary gears (432) are meshed at intervals on the outer periphery of the second sun gear (431), and each second planetary gear (432) is meshed with the tooth portion. The second planetary carrier (433) is located on the side of the second sun gear (431) away from the first sun gear (421). Each second planetary gear (432) is connected with the second planetary carrier (433). The side of the second planetary carrier (433) away from the second sun gear (431) is provided with the output shaft (5).

10. The gearbox (1000) according to claim 9, characterized in that Further comprising a bearing seat (44) and a bearing (45). The bearing seat (44) is located between the gear ring (41) and the front end cover (1). The bearing (45) is located in the bearing seat (44) and is sleeved on the output shaft (5). Further comprising a first friction plate (46) sleeved on the second sun gear (431) and located between the first planetary carrier (423) and the second planetary gear (432). Further comprising a second friction plate (47) sleeved on the first sun gear (421) and located on the side of the first planetary gear (422) away from the first planetary carrier (423). Further comprising a third friction plate. When the input components are multiple, the third friction plate is arranged at the connection between adjacent two input components.

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