Gear ring mounting structure and gear box

Abstract

The utility model provides a gear ring mounting structure and a gear box. The gear ring mounting structure comprises a gear ring mounting piece. The supporting ring and the gear ring mounting piece are mounted in a circumferential anti-torsion manner; the gear ring is installed on the gear ring installation piece in a circumferential direction and anti-torque mode through a supporting ring, a concave-convex structure is formed on the circumferential wall of the supporting ring in the circumferential direction of the supporting ring, and an inner circumferential concave portion located on the inner circumferential wall and an outer circumferential convex portion located on the outer circumferential wall are formed on the portion, integrally deformed towards the radial outer side, of the circumferential wall of the supporting ring. An inner peripheral convex part located on the inner peripheral wall and an outer peripheral concave part located on the outer peripheral wall are formed on the portion, integrally deformed towards the radial inner side, of the peripheral wall of the supporting ring, a spline is arranged on the periphery of the gear ring, and the spline is matched with the inner peripheral concave part, so that the gear ring and the supporting ring are installed in a circumferential anti-torque mode. And an accommodating space is formed between the peripheral concave part and the gear ring mounting piece.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gear transmission, and particularly relates to a gear ring mounting structure and a gear box. BACKGROUND

[0002] The planetary gear box comprises a housing and a gear ring, and the gear ring is fixedly connected to the housing.

[0003] US20120258831A1 (see also CN102596617A) discloses an electric motor for an electric axle of a motor vehicle. The electric axle comprises a housing and a gear ring, the gear ring is provided with a through hole, the housing is provided with a threaded hole, and the gear ring is fixedly connected to the housing by a bolt.

[0004] The gear ring is directly fixed to the housing by using a bolt, the gear ring cannot float, and cannot absorb the vibration transmitted by the planetary gear, the vibration will be directly transmitted to the housing, resulting in poor noise, vibration and harshness (NVH) performance. In addition, the torque is transmitted only by the friction force generated by tightening the bolt between the gear ring and the housing, and if the transmitted torque is large, the number of bolts needs to be increased. In the oil environment inside the gear box, in order to prevent loosening of the bolt, a bolt with an anti-loosening coating needs to be used, such a bolt cannot be reused, and the cost of the bolt is relatively high.

[0005] DE102017114480A1 discloses a vehicle, an electric axle and a transmission of a vehicle with an electric axle, the outer periphery of the gear ring is provided with a spline, the inner periphery of the housing is provided with a spline groove, the gear ring is fixed in the circumferential direction and can transmit torque by embedding the spline of the gear ring into the spline groove. A snap ring is arranged on the axial side of the gear ring to limit the axial movement of the gear ring.

[0006] Since the strength of the aluminum alloy shell material is low, more key grooves need to be arranged to share the torque of the gear ring, and more key grooves result in slow machining speed and difficult precision control of the housing and the gear ring. Therefore, the machining cost of the housing and the gear ring is relatively high.

[0007] CN117869567A discloses a speed reducer, an electric drive system and a vehicle, the outer peripheral wall of the positioning sleeve cooperates with the inner peripheral wall of the housing, the gear ring and the positioning sleeve are connected through spline cooperation, and the pressing plate is connected to the axial end of the positioning sleeve to limit the axial movement of the gear ring.

[0008] Since the positioning sleeve is fixed to the housing by a bolt, the torque is transmitted by the friction force generated by tightening the bolt, and if the transmitted torque is large, the number of bolts needs to be increased, and the positioning sleeve fixed by the bolt also limits the gear ring from absorbing vibration. CONTENT OF THE UTILITY MODEL

[0009] The application aims to provide a gear ring mounting structure, so that the gear ring and the gear can be better lubricated by oil when they are engaged.

[0010] Embodiments of the present application provide a gear ring mounting structure, comprising:

[0011] a gear ring mounting member;

[0012] a support ring, the support ring and the gear ring mounting member being circumferentially torsionally mounted; and

[0013] a gear ring, the gear ring being disposed radially inward of the support ring, the gear ring being circumferentially torsionally mounted to the gear ring mounting member via the support ring,

[0014] a circumferential wall of the support ring is formed with a concave-convex structure along a circumferential direction of the support ring, a portion of the circumferential wall of the support ring that is deformed as a whole radially outward forms an inner circumferential concave portion at an inner circumferential wall and an outer circumferential convex portion at an outer circumferential wall, a portion of the circumferential wall of the support ring that is deformed as a whole radially inward forms an inner circumferential convex portion at the inner circumferential wall and an outer circumferential concave portion at the outer circumferential wall,

[0015] an outer periphery of the gear ring is provided with a spline, the spline and the inner circumferential concave portion cooperate to circumferentially torsionally mount the gear ring and the support ring, the outer circumferential concave portion and the gear ring mounting member have a receiving space therebetween.

[0016] In at least one possible implementation, the support ring has a material strength greater than that of the gear ring mounting member, and the support ring is made by a stamping process.

[0017] In at least one possible implementation, an outer periphery of the support ring is provided with a support portion protruding radially outward of the support ring, the support portion is provided with a torsion resisting portion, the gear ring mounting member is provided with a support surface, the support surface is one or more planes extending along a radial direction and a circumferential direction of the gear ring mounting member, the support surface is provided with a torsion resisting mating portion, the support portion is supported on the support surface, and the torsion resisting portion and the torsion resisting mating portion are cooperatively mounted to circumferentially torsionally mount the support ring and the gear ring mounting member.

[0018] In at least one possible implementation, the torsion resisting portion is provided with a plurality along a circumferential direction of the support ring, the torsion resisting mating portion is provided with a plurality along a circumferential direction of the gear ring mounting member, and / or

[0019] the torsion resisting portion is provided with a plurality at different positions in an axial direction of the support ring, and the torsion resisting mating portion is provided with a plurality at different positions in an axial direction of the gear ring mounting member.

[0020] In at least one possible implementation, the support portion includes a first support portion protruding radially outward from the outer circumferential concave portion and located at an axial end of the outer circumferential concave portion, the first support portion is provided with a first torsion resisting portion in the form of a protrusion,

[0021] The support surface comprises a first support surface provided with a first anti-torque fitting part in the form of a groove, the first support part is supported on the first support surface, the first anti-torque part and the first anti-torque fitting part are installed in plug-in fitting, so that the support ring and the gear ring mounting are circumferentially and anti-torque installed.

[0022] In at least one possible implementation, the support part comprises a second support part protruding radially outward from the outer circumferential protrusion and located at the axially opposite end of the outer circumferential protrusion, the second support part is provided with a second anti-torque part in the form of a protrusion,

[0023] The support surface comprises a second support surface provided with a second anti-torque fitting part in the form of a groove, the second support part is supported on the second support surface, the second anti-torque part and the second anti-torque fitting part are installed in plug-in fitting, so that the support ring and the gear ring mounting are circumferentially and anti-torque installed.

[0024] In at least one possible implementation, the axially opposite end of the inner circumferential protrusion is provided with a gear ring axial limiting part protruding radially inward, the gear ring axial limiting part can block the axial movement of the gear ring along the support ring,

[0025] The gear ring mounting structure further comprises a snap ring, the gear ring mounting is a housing of a gear box, the gear ring mounting is provided with a snap ring mounting groove, the snap ring is clamped to the snap ring mounting groove, for preventing the support ring from falling off the gear ring mounting along the axial direction of the gear ring mounting.

[0026] In at least one possible implementation, the anti-torque part is a protrusion extending in the axial direction of the support ring, and the anti-torque fitting part is a groove extending in the axial direction of the gear ring mounting.

[0027] The embodiments of the present application also propose a gear box comprising a housing and a planetary gear assembly received in the housing, the planetary gear assembly comprises a gear ring, the gear ring is mounted on the housing as the gear ring mounting through the gear ring mounting structure according to any one of the above technical solutions.

[0028] By temporarily storing oil in the accommodation space between the outer circumferential recess and the gear ring mounting, the oil in the accommodation space can flow to the gear meshing position, which is beneficial for lubricating the gears of the gear box. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A cross-sectional view showing part of the structure of a gear box according to an embodiment of the present application is shown.

[0030] Figure 2 A structural diagram showing a partial structure of a gear box according to an embodiment of the present application is shown.

[0031] Figure 3 A structural diagram showing a ring gear mount, a ring gear, and a support ring of a gear box according to an embodiment of the present application is shown.

[0032] Figure 4 A structural diagram showing a ring gear mount of a gear box according to an embodiment of the present application is shown.

[0033] Figure 5 A structural diagram showing a ring gear and a support ring of a gear box according to an embodiment of the present application is shown.

[0034] Figure 6 A structural diagram showing a ring gear and a support ring of a gear box according to an embodiment of the present application is shown.

[0035] Figure 7 A structural diagram showing a support ring of a gear box according to an embodiment of the present application is shown.

[0036] Figure 8 A structural diagram showing a ring gear of a gear box according to an embodiment of the present application is shown.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] 1 ring gear mount 11 first support surface 12 second support surface 13 first torque resistant fitting portion 14 second torque resistant fitting portion 15 support surface 16 torque resistant fitting portion

[0039] 2 ring gear 21 spline 211 protrusion

[0040] 3 support ring 31 inner circumferential recess

[0041] 32 inner circumferential protrusion 321 ring gear axial limit portion

[0042] 33 outer circumferential recess 331 first support portion 332 first torque resistant portion

[0043] 34 outer circumferential protrusion 341 second support portion 342 second torque resistant portion

[0044] 35 support portion

[0045] 36 torque resistant portion

[0046] 4 snap ring

[0047] P planetary gear assembly

[0048] A axial C circumferential. DETAILED DESCRIPTION

[0049] In order to illustrate the above objects, features and advantages of the application more clearly, the detailed description of the specific embodiments of the application is given in this section in conjunction with the accompanying drawings. In addition to the various embodiments described in this section, the application can be implemented in other different ways, and those skilled in the art can make corresponding modifications, variations and substitutions without departing from the spirit of the application, so the application is not limited to the specific embodiments disclosed in this section. The scope of protection of the application should be subject to the claims.

[0050] As shown in Figures 1 to 8 , the embodiments of the application propose a gear box, which comprises a housing (ring gear mount 1), a support ring 3, a snap ring 4 and a planetary gear assembly P, the housing (ring gear mount 1) can at least partially accommodate the planetary gear assembly P. The planetary gear assembly P comprises a ring gear 2, a plurality of planetary gears, a carrier and a sun gear. The ring gear 2 is annular, the inner periphery of the ring gear 2 is provided with teeth for engaging with gears (planetary gears), the ring gear 2 is connected to the housing (ring gear mount 1) through the support ring 3, and the snap ring 4 is mounted on the housing (ring gear mount 1). The plurality of planetary gears are rotatably connected to the carrier relative to the carrier, and the sun gear is arranged at the center position of the ring gear 2, and the plurality of planetary gears are engaged with both the ring gear 2 and the sun gear.

[0051] In the axial direction A, the side close to the bottom of the housing (ring gear mount 1) in Figure 1 is called the axial one side (right side in Figure 1 ), and the side close to the opening of the housing (ring gear mount 1) in Figure 1 is called the axial other side (left side in Figure 1 ).

[0052] It can be understood that only part of the housing of the gear box is shown in Figure 1 , which is used to accommodate the planetary gear assembly P, and the complete gear box can further comprise an end cover or another half housing connected to the housing in Figure 1 , so as to close the housing in Figure 1 .

[0053] As shown in Figure 4 , the housing (ring gear mount 1) is provided with a support surface 15, which can be a plane extending along the radial direction and the circumferential direction C of the housing (ring gear mount 1), and the support surface 15 can be provided with a torque-resistant fitting portion 16, which can be circumferentially torque-resistantly fitted and mounted with the support ring 3 without using bolts or rivets for fixed connection. The support ring 3 can have a certain space of movement relative to the housing (ring gear mount 1), so as to absorb a certain vibration.

[0054] The support surface 15 includes a first support surface 11 and a second support surface 12, which are parallel and can both be annular. The second support surface 12 can be located radially outside the first support surface 11. The first support surface 11 and the second support surface 12 are offset in the axial direction A. The second support surface 12 is closer to the opening side of the housing (i.e., the insertion side of the gear ring 2) than the first support surface 11.

[0055] The first support surface 11 may be provided with a first anti-torsion fitting part 13, which may be a groove on the surface of the first support surface 11. The second support surface 12 may be provided with a second anti-torsion fitting part 14, which may be a groove on the surface of the second support surface 12. Multiple first anti-torsion fitting parts 13 and second anti-torsion fitting parts 14 may be provided along the circumferential direction C of the shell.

[0056] The housing is also provided with a retaining ring mounting groove, which is annular and can be located on the opposite side of the second support surface 12 along the axial direction. The retaining ring mounting groove can accommodate the retaining ring 4.

[0057] like Figure 5 , Figure 6 and Figure 8 As shown, the inner circumference of the gear ring 2 may be provided with teeth for meshing with the planetary gear, and the outer circumference of the gear ring 2 may be provided with splines 21. The splines 21 include a plurality of protrusions 211 arranged along the circumferential direction C of the gear ring 2.

[0058] like Figure 3 , Figures 5 to 7 As shown, the support ring 3 is generally a ring-shaped sheet structure extending along the axial direction A and the circumferential direction C. A support portion 35 protruding radially outward is provided on the outer periphery of the support ring 3. The support portion 35 may be provided with an anti-torsion portion 36, which can be circumferentially anti-torsionally engaged with the anti-torsional fitting portion 16 of the housing without the use of bolts or rivets for fixing. Therefore, the support ring 3 has a certain amount of room to move relative to the housing (gear ring mounting part 1), thus absorbing a certain amount of vibration.

[0059] The inner circumferential wall of the support ring 3 includes an inner circumferential recess 31 and an inner circumferential protrusion 32. The inner circumferential recess 31 is recessed radially outward of the support ring 3, and the inner circumferential protrusion 32 is protruded radially inward of the support ring 3. The inner circumferential recess 31 and the inner circumferential protrusion 32 are arranged alternately along the circumferential direction C on the inner circumferential wall of the support ring 3, thereby forming an uneven structure on the inner circumferential wall of the support ring 3.

[0060] The outer peripheral wall of the support ring 3 includes outer peripheral recesses 33 and outer peripheral protrusions 34. The outer peripheral recesses 33 are recessed toward the radially inner side of the support ring 3. The outer peripheral protrusions 34 are protruded toward the radially outer side of the support ring 3. The outer peripheral recesses 33 and the outer peripheral protrusions 34 are alternately arranged in the circumferential direction C of the outer peripheral wall of the support ring 3, so that the outer peripheral wall of the support ring 3 can form a structure with unevenness.

[0061] On the circumferential direction C of the support ring 3, the inner peripheral recesses 31 and the outer peripheral protrusions 34 are located at the same position, and the inner peripheral recesses 31 and the outer peripheral protrusions 34 are on the inner and outer sides of the same section of the circumferential direction C of the support ring 3. On the circumferential direction C of the support ring 3, the inner peripheral protrusions 32 and the outer peripheral recesses 33 are located at the same position, and the inner peripheral protrusions 32 and the outer peripheral recesses 33 are on the inner and outer sides of the same section of the circumferential direction C of the support ring 3.

[0062] The support ring 3 can be sleeved on the radially outer side of the gear ring 2. By embedding the splines 21 into the inner peripheral recesses 31 of the support ring 3, the gear ring 2 and the support ring 3 can be torsionally connected in the circumferential direction C, and no bolt or rivet is used for fixed connection. The gear ring 2 can have a certain space for movement relative to the support ring 3, so as to absorb a certain vibration.

[0063] The axially other end (the opening side of the housing, the left side in FIG. Figure 1 The axially other end (the opening side of the housing, the left side in FIG.

[0064] The axially other end (the opening side of the housing, the left side in FIG. Figure 1 The axially other end (the opening side of the housing, the left side in FIG.

[0065] Figure 1 ​The left side of the housing may be provided with a second support portion 341 that protrudes radially outward. A second anti-torsion portion 342 may be provided on one axial side of the second support portion 341 (the bottom side of the housing), and the second anti-torsion portion 342 may be a protrusion. The second support portion 341 can be supported on the second support surface 12 to prevent the support ring 3 from overturning and to keep the support ring 3 stable. The second anti-torsion portion 342 can cooperate with the second anti-torsion mating portion 14 to allow the support ring 3 and the housing to be installed anti-torsively, and to withstand the torque transmitted from the gear ring 2 to the housing.

[0066] The support ring 3 has a simple structure and can be made by sheet metal stamping without the need for machining, making it easy to mass-produce and with low production costs.

[0067] The support ring 3 can be made of steel, and the housing (gear ring mounting part 1) can be made of aluminum alloy. The material strength of the support ring 3 is greater than that of the gear ring mounting part 1. Therefore, even with fewer spline protrusions on the gear ring, it can still transmit a larger torque. Furthermore, the number of spline protrusions 21 on the gear ring 2 and the number of inner circumferential recesses 31 on the support ring 3 can be reduced, thereby lowering the machining difficulty and production cost of the gear ring 2 and the support ring 3.

[0068] The support ring 3 has a certain strength and can absorb the vibration of the gear ring 2, thereby improving the noise, vibration and harshness (NVH) performance of the gearbox.

[0069] There is a receiving space between the outer peripheral recess 33 of the support ring 3 and the housing (gear ring mount 1) for temporarily storing oil. Specifically, when the gearbox is tilted, some oil inside the gearbox can flow into the receiving space. When the gearbox returns to its normal position from the tilted state, the oil can flow out from the receiving space and flow to the gear meshing position. This temporary oil storage in the receiving space is beneficial for gear lubrication.

[0070] like Figure 1 and Figure 2 As shown, the retaining ring 4 can be installed on the housing (gear ring mounter 1). The inner diameter of the retaining ring 4 can be smaller than the outer diameter of the second support 341. The retaining ring 4 is at least partially located on the other side of the axial direction of the second support 341. The retaining ring 4 located on the other side of the axial direction of the second support 341 can prevent the support ring 3 from detaching from the housing (gear ring mounter 1) along the axial direction A.

[0071] The retaining ring 4 can be a notched, incomplete ring. The retaining ring 4 can be squeezed to produce elastic deformation. By applying external force to the retaining ring 4 to make the retaining ring 4 elastically deform, the retaining ring 4 can be inserted into the retaining ring mounting groove, and the retaining ring 4 remains in the retaining ring mounting groove after at least partially recovering its elastic deformation.

[0072] The present application is not limited to the above-described embodiments, and various modifications can be made to the above-described embodiments of the present application by those skilled in the art under the teachings of the present application without departing from the scope of the present application. In addition, the following is described.

[0073] (1) It can be understood that, in the above-described embodiments, the first anti-twist fitting portion 13 and the second anti-twist fitting portion 14 are grooves, and the first anti-twist portion 332 and the second anti-twist portion 342 are protrusions, but the present application is not limited thereto, and in other possible embodiments, the first anti-twist fitting portion or the second anti-twist fitting portion can be a protrusion, and the first anti-twist portion or the second anti-twist portion can be a groove.

[0074] (2) It can be understood that, in the above-described embodiments, the support surface includes the first support surface and the second support surface, and the support portion includes the first support portion and the second support portion, but the present application is not limited thereto, and in other possible embodiments, the support surface can include only the first support surface or the second support surface, and the support portion includes only the first support portion or the second support portion.

[0075] It should be understood that at least some aspects or features of the above-described embodiments, examples, or implementations can be appropriately combined.

[0076] It can be understood that, in the present application, when the number of components or members is not particularly limited, the number can be one or more, and here, the plurality refers to two or more. For the case where the number of components or members is described as a specific number, such as two, three, four, etc., in the drawings and / or the description, the specific number is generally exemplary rather than limiting, and it can be understood as a plurality, i.e., two or more, but this does not mean that the present application excludes the case of one.

[0077] In the present application, unless otherwise explicitly stated or limited, the terms "mounting", "assembly", "assembly", "connection", "connection", "coupling", "connection", "abutment", "communication", "communication", "conduction", "fixing", "fastening", etc. should be understood broadly, for example, it can be direct or indirect. For example, in terms of connection, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication or interaction relationship between two elements, unless otherwise explicitly stated or limited. For example, in terms of communication / conduction, etc., it can be direct communication / conduction, or indirect communication / conduction via an intermediate medium. 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.

[0078] In the present application, unless specifically stated or limited otherwise, a component is disposed in / installed in / located in / contained in / placed in another component, etc. can be either of the following two cases: a part or most of the component is located in the other component; and the component is completely contained in the other component.

[0079] Although the present application has been described in detail above with reference to the embodiments, it is apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified in various ways without departing from the spirit and scope of the present application as defined by the claims, and can be implemented as modified embodiments. Therefore, the description in the present specification is intended for the purpose of illustration only, and does not have any restrictive meaning on the present application.

Claims

1. A gear ring mounting structure characterized by comprising: Comprising: a ring gear mount; a support ring, the support ring and the ring gear mount being circumferentially torsionally mounted; and a ring gear, the ring gear being disposed radially inward of the support ring, the ring gear being circumferentially torsionally mounted to the ring gear mount by the support ring, a circumferential wall of the support ring is formed with a concave-convex structure along a circumferential direction of the support ring, a portion of the circumferential wall of the support ring that is deformed as a whole to a radially outer side forms an inner circumferential concave portion at an inner circumferential wall and an outer circumferential convex portion at an outer circumferential wall, a portion of the circumferential wall of the support ring that is deformed as a whole to a radially inner side forms an inner circumferential convex portion at the inner circumferential wall and an outer circumferential concave portion at the outer circumferential wall, an outer periphery of the ring gear is provided with a spline, the spline and the inner circumferential concave portion cooperate to circumferentially torsionally mount the ring gear and the support ring, the outer circumferential concave portion and the ring gear mount have an accommodation space therebetween.

2. The gear ring mounting structure according to claim 1, characterized by The material strength of the support ring is greater than the material strength of the ring gear mount, the support ring is made by a stamping process.

3. The ring gear mounting structure according to claim 1, wherein an outer periphery of the support ring is provided with a support portion that protrudes to a radially outer side of the support ring, the support portion is provided with a torsion resisting portion, the ring gear mount is provided with a support surface that is one or more planes extending along a radial direction and a circumferential direction of the ring gear mount, the support surface is provided with a torsion resisting mating portion, the support portion is supported on the support surface, the torsion resisting portion and the torsion resisting mating portion are fitted and mounted to circumferentially torsionally mount the support ring and the ring gear mount.

4. The ring gear mounting structure according to claim 3, wherein a plurality of the torsion resisting portions are provided along the circumferential direction of the support ring, a plurality of the torsion resisting mating portions are provided along the circumferential direction of the ring gear mount, and / or a plurality of the torsion resisting portions are provided at different positions in an axial direction of the support ring, a plurality of the torsion resisting mating portions are provided at different positions in an axial direction of the ring gear mount.

5. The gear ring mounting structure according to claim 3, characterized by the support portion includes a first support portion that protrudes to a radially outer side from the outer circumferential concave portion and is located at one end in an axial direction of the outer circumferential concave portion, the first support portion is provided with a first torsion resisting portion in the form of a protrusion, the support surface includes a first support surface that is provided with a first torsion resisting mating portion in the form of a recess, the first support portion is supported on the first support surface, the first torsion resisting portion and the first torsion resisting mating portion are fitted and mounted in a plug-in manner to circumferentially torsionally mount the support ring and the ring gear mount.

6. The gear ring mounting structure according to claim 3, characterized by the support portion includes a second support portion that protrudes to a radially outer side from the outer circumferential convex portion and is located at the other end in the axial direction of the outer circumferential convex portion, the second support portion is provided with a second torsion resisting portion in the form of a protrusion, the support surface includes a second support surface that is provided with a second torsion resisting mating portion in the form of a recess, the second support portion is supported on the second support surface, the second torsion resisting portion and the second torsion resisting mating portion are fitted and mounted in a plug-in manner to circumferentially torsionally mount the support ring and the ring gear mount.

7. The gear ring mounting structure according to claim 1, characterized by An axial other end of the inner circumferential protrusion is provided with a gear ring axial limiting part protruding to a radially inner side, which can block axial movement of the gear ring along the support ring, The gear ring mounting structure further comprises a snap ring, the gear ring mounting part is a housing of a gear box, the gear ring mounting part is provided with a snap ring mounting groove, and the snap ring is clamped to the snap ring mounting groove to prevent the support ring from falling off the gear ring mounting part in an axial direction of the gear ring mounting part.

8. The gear ring mounting structure according to claim 3, characterized by The anti-torsion part is a protrusion extending in an axial direction of the support ring, and the anti-torsion fitting part is a groove extending in an axial direction of the gear ring mounting part.

9. A gear box characterized in that, The gear box comprises a housing and a planetary gear assembly received in the housing, the planetary gear assembly comprises a gear ring, and the gear ring is mounted to the housing as the gear ring mounting part through the gear ring mounting structure according to any one of claims 1 to 8.

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