Locking assembly and speed reducer assembly

Abstract

The locking assembly comprises an output shaft, a first bearing and a locking sleeve, the output shaft is sleeved with the first bearing and the locking sleeve, the first bearing comprises a first inner ring and a second outer ring which are sequentially arranged along the inner ring and the outer ring, the first inner ring is fastened to the periphery of the output shaft, the first outer ring is fastened to a machine shell, and the second outer ring is fastened to the machine shell. The output shaft is rotationally supported on the machine shell, the locking sleeve is arranged on the output shaft in a sleeving and riveting mode, so that the locking sleeve is matched with the machine shell to axially limit the first bearing, the limiting matching part on the output shaft is matched with the limiting matching part on the locking sleeve, and relative rotation between the locking sleeve and the output shaft is prevented. According to the speed reducer assembly, through the circumferential limiting structure between the output shaft and the locking sleeve, the situation that the output shaft and the locking sleeve rotate relative to each other and loosen is avoided, in this way, the locking sleeve and the output shaft are not prone to loosen, reliable axial limiting of the first bearing is achieved, the stability of the speed reducer assembly is improved, and the service life of the speed reducer assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle manufacturing, and particularly relates to a locking assembly and a speed reducer assembly. Background Art

[0002] In a wheel side speed reducer in the prior art, a bearing is generally sleeved on the output end of an output shaft, and a locking sleeve on the output shaft is required to fasten the output shaft and axially limit the bearing. Among them, the locking sleeve is usually fastened to the output shaft by screwing or riveting.

[0003] However, during the operation of the wheel side speed reducer, the output shaft and the locking sleeve are affected by the vibration force generated during the operation of the speed reducer for a long time, and it is easy to occur the phenomenon of relative rotation and loosening between the two, resulting in the displacement of the bearing, and further having an adverse effect on the service life of the speed reducer assembly. Summary of the Utility Model

[0004] The utility model aims to provide a locking assembly and a speed reducer assembly with reliable locking, not easy to loosen, and extended service life.

[0005] To solve the above technical problems, the utility model provides a locking assembly, including: an output shaft, on which a limiting portion is provided;

[0006] A first bearing sleeved on the output shaft, the first bearing includes a first inner ring and a first outer ring arranged in sequence along the inner and outer rings, and the first inner ring is fastened to the outer periphery of the output shaft; and,

[0007] A locking sleeve sleeved and riveted on the output shaft, the locking sleeve is arranged on one side of the first bearing in the axial direction, and has a limiting surface axially abutting against the first inner ring, a limiting and cooperating portion is provided on the locking sleeve, and the limiting portion cooperates with the limiting and cooperating portion to limit the relative rotation between the locking sleeve and the output shaft.

[0008] Optionally, the limiting portion is a groove recessed on the outer peripheral side of the output shaft, and the limiting and cooperating portion is a convex block protruding on the inner peripheral side of the locking sleeve; or, the limiting portion is a convex block protruding on the outer peripheral side of the output shaft, and the limiting and cooperating portion is a groove recessed on the inner peripheral side of the locking sleeve;

[0009] The groove has an opening at one end axially relatively close to the convex block, and includes inner side walls respectively arranged on both sides of the opening in the radial direction. The convex block is embedded into the groove from the opening, and both sides of the convex block in the radial direction respectively abut against the two inner side walls.

[0010] Optionally, the depth of the groove gradually increases in the direction close to the convex block; and / or,

[0011] The protruding height of the bump gradually decreases in the direction close to the groove.

[0012] Optionally, the groove further has a bottom wall extending between the two inner side walls, and the bottom wall is arranged as a concave arc surface.

[0013] Optionally, a first stepped surface is formed on the outer periphery of the output shaft. The first stepped surface and the locking sleeve are distributed on opposite sides of the first bearing in the axial direction, and the first inner ring is clamped between the locking sleeve and the first stepped surface.

[0014] To solve the above technical problems, the present utility model further provides a reducer assembly, including:

[0015] A housing having an installation cavity. A first shaft hole and a second shaft hole are formed in the housing, and the first shaft hole and the second shaft hole are respectively communicated with the installation cavity;

[0016] The locking assembly as described above, wherein the output shaft extends out of the installation cavity from the second shaft hole; and,

[0017] A speed reduction transmission assembly is installed in the installation cavity and has an input end and an output end. The input end is axially connected to an input shaft inserted into the installation cavity from the first shaft hole, and the output end is axially connected to the output shaft.

[0018] Optionally, the reducer assembly further includes a bearing pressing plate installed on the housing. A through hole is formed in the bearing pressing plate, and the bearing pressing plate covers the outside of the second shaft hole. A first flange is correspondingly arranged on the inner side of the second shaft hole of the housing. The first outer ring is fastened to the inner wall of the housing and clamped between the first flange and the bearing pressing plate, and the output shaft passes through the through hole.

[0019] Optionally, the speed reduction transmission assembly includes:

[0020] A first planetary transmission group is installed in the installation cavity. The first planetary transmission group includes a first sun gear, a plurality of first planetary gears, a first ring gear, and a first planetary carrier. The first ring gear is fixed to the housing and sleeved outside the plurality of first planetary gears. The first planetary carrier connects the plurality of first planetary gears, and the first sun gear constitutes the input end; and,

[0021] A second planetary transmission group includes a second planetary carrier and a second sun gear, a plurality of second planetary gears, and a second ring gear installed in the installation cavity. The second sun gear is axially connected to the first planetary carrier. The second ring gear is sleeved outside the plurality of second planetary gears. One end of the second planetary carrier connects the plurality of second planetary gears, and the other end of the second planetary carrier constitutes the output end.

[0022] Optionally, the speed reducer assembly further includes a second bearing, and the second bearing includes a second inner ring and a second outer ring which are sequentially arranged along the inner and outer rings;

[0023] The second planet carrier includes a ring frame sleeved on the outer circumferences of a plurality of the second planet gears, and a first shaft sleeve and a second shaft sleeve respectively protruding from both sides of the ring frame. The first shaft sleeve is in spline connection with the output shaft, the second bearing is sleeved on the second shaft sleeve, the second inner ring is fastened to the outer circumference of the second shaft sleeve, and the second outer ring is fastened to the inner wall of the housing.

[0024] Optionally, a first mounting groove and a second flange which are sequentially distributed in the axial direction are provided on the inner wall of the housing. The first mounting groove and the second flange respectively extend in a ring shape. A plurality of first retaining pieces which are circumferentially spaced apart are inserted into the first mounting groove. The second outer ring is clamped between the plurality of first retaining pieces and the second flange; and / or,

[0025] A second step surface and a second mounting groove which are sequentially distributed in the axial direction are provided on the outer circumference of the second shaft sleeve. The second step surface and the second mounting groove respectively extend in a ring shape. A plurality of second retaining pieces which are circumferentially spaced apart are inserted into the second mounting groove. The second inner ring is clamped between the plurality of second retaining pieces and the second step surface.

[0026] The technical solution provided by the present utility model has the following advantages:

[0027] The locking assembly provided by the present utility model includes an output shaft, a first bearing and a locking sleeve sleeved on the output shaft. The first bearing includes a first inner ring and a second outer ring which are sequentially arranged along the inner and outer rings. The first inner ring is fastened to the outer circumference of the output shaft, and the first outer ring is fastened to the housing, so that the output shaft is rotatably supported by the housing through the first bearing. The locking sleeve is sleeved and riveted on the output shaft, and thus cooperates with the housing to realize reliable axial limit for the first bearing. A limiting portion is provided on the output shaft, and a limiting cooperation portion is correspondingly provided on the locking sleeve. The two cooperate with each other to limit the relative rotation between the locking sleeve and the output shaft. In the present utility model, through the circumferential limit structure design between the output shaft and the locking sleeve, the situation that the two are loosened due to relative rotation during the operation of the speed reducer assembly is avoided. In this way, it is not easy for the locking sleeve and the output shaft to be loosened, reliable axial limit for the first bearing is realized, and the stability and service life of the speed reducer assembly are improved. Description of the Drawings

[0028] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the reducer assembly provided by the present utility model;

[0030] Figure 2 For Figure 1 Cross-sectional view of the reducer assembly in

[0031] Figure 3 For Figure 2 Enlarged schematic view at position A in

[0032] Figure 4 For Figure 2 Enlarged schematic view at position B in

[0033] Figure 5 For Figure 1 Schematic diagram of the three-dimensional decomposition of a partial structure of the reducer assembly in

[0034] Figure 6 For Figure 5 Three-dimensional structure diagram of the output shaft in

[0035] Figure 7 For Figure Figure 6 Enlarged schematic view at position C in

[0036] Figure 8 For Figure 6 Cross-sectional view of the output shaft in

[0037] Figure 9 For Figure 8 Enlarged schematic view at position D in

[0038] Figure 10 For Figure 5 Front view of the locking sleeve in

[0039] Figure 11 For Figure 10 Cross-sectional view at A-A in

[0040] Figure 12 For Figure 5 Front view of the bearing pressure plate in

[0041] Figure 13 For Figure 12 Cross-sectional view at B-B in

[0042] Figure 14 is Figure 5 the assembly schematic diagram of the output shaft and the second planet carrier in

[0043] Figure 15 is Figure 14 the three-dimensional structure schematic diagram of the second planet carrier in

[0044] Figure 16 is Figure 15 the front view of the second planet carrier in

[0045] Figure 17 is Figure 16 the sectional view at C-C in

[0046] Description of the reference numerals:

[0047] 1000 - reducer assembly; 100 - locking assembly; 10 - output shaft; 11 - limiting part; 12 - groove; 121 - opening; 122 - inner side wall; 123 - bottom wall; 13 - first step surface; 20 - locking sleeve; 21 - limiting and mating part; 22 - bump; 23 - limiting surface; 30 - first bearing; 31 - first inner ring; 32 - first outer ring; 40 - second bearing; 41 - second inner ring; 42 - second outer ring; 200 - housing; 50 - installation cavity; 51 - first shaft hole; 52 - second shaft hole; 53 - first flange; 54 - second flange; 55 - first installation groove; 300 - speed reduction and transmission assembly; 301 - first planetary transmission group; 60 - first sun gear; 61 - first planetary gear; 62 - first ring gear; 63 - first planet carrier; 302 - second planetary transmission group; 70 - second sun gear; 71 - second planetary gear; 72 - second ring gear; 73 - second planet carrier; 731 - ring frame; 732 - first shaft sleeve; 733 - second shaft sleeve; 80 - bearing pressing plate; 81 - through hole; 90 - second installation groove; 91 - first retaining piece; 92 - second retaining piece; 93 - second step surface; 400 - input shaft. Detailed implementation manners

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0049] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence.

[0050] Please refer to Figures 1 to 17The utility model provides a reducer assembly 1000 and a locking assembly 100 thereof. The reducer assembly 1000 can be applied to vehicle wheel-side deceleration, and can also be applied to other deceleration transmission scenarios. In a preferred embodiment, the reducer assembly 1000 is applied to heavy truck wheel-side deceleration. It is best to respectively set a reducer assembly 1000 on two wheels arranged side by side, so that differential steering between the two wheels can be achieved.

[0051] Please continue reading Figure 1 and Figure 2 The reducer assembly 1000 includes a housing 200, which is used to provide installation support and protection for the reducer assembly 1000. Specifically, a mounting cavity 50 is formed in the housing 200, and a reduction transmission assembly 300 is installed in the mounting cavity 50. The housing 200 is provided with a first shaft hole 51 and a second shaft hole 52 which are arranged opposite to each other in the axial direction, and the first shaft hole 51 and the second shaft hole 52 are connected to the mounting cavity 50 respectively. The first shaft hole 51 is used for the input shaft 400 to extend into the mounting cavity 50, and the input shaft 400 is driven to rotate by an external main power source, such as a vehicle motor, so as to provide driving force for the reduction transmission assembly 300 inside the housing 200, and the second shaft hole 52 is used for the output shaft 10 to extend to realize power output. The reduction transmission assembly 300 is transmission-connected between the input shaft 400 and the output shaft 10 to realize the reduction output of the power source. Furthermore, the reduction transmission assembly 300 has an input end and an output end, wherein the input end is a component in the reduction transmission assembly 300 that is directly connected to the input shaft 400 in an axial transmission manner, and the output end serves as the power output end of the reduction transmission assembly 300 and is connected to the output shaft 10 in an axial transmission manner, thereby utilizing the output shaft 10 to output the decelerated power.

[0052] It can be understood that the output shaft 10 should be stably rotatably supported on the housing 200. Figures 2 to 4 The utility model provides a locking assembly 100.

[0053] Please continue to refer to Figures 5 to 11, the locking assembly 100 includes the above-mentioned output shaft 10, a first bearing 30 sleeved on the output shaft 10, and a locking sleeve 20. The output shaft 10 is provided with a limiting portion 11. The first bearing 30 includes a first inner ring 31 and a first outer ring 32 arranged in sequence along the inner and outer rings. Generally, balls or other components for reducing rotational friction are arranged between the first inner ring 31 and the first outer ring 32. The first inner ring 31 is fastened to the outer periphery of the output shaft 10, and the first outer ring 32 should be fastened to the housing 200 so that the output shaft 10 is rotatably supported in the housing 200 through the first bearing 30. The locking sleeve 20 is sleeved and riveted to the output shaft 10 to be firmly fastened to the outer periphery of the output shaft 10. The locking sleeve 20 is arranged on one side of the first bearing 30 in the axial direction and has a limiting surface 23 that abuts against the first inner ring 31 in the axial direction, thereby realizing one-way axial limiting of the first bearing 30. The locking sleeve 20 is provided with a limiting and mating portion 21, and the limiting portion 11 cooperates with the limiting and mating portion 21 to limit the relative rotation between the locking sleeve 20 and the output shaft 10.

[0054] It can be understood that the specific structures of the limiting portion 11 and the limiting and mating portion 21 can be selected according to needs as long as they can realize the structure for restricting the circumferential rotation between the output shaft 10 and the locking sleeve 20. In this embodiment, the first inner ring 31 is fastened to the outer periphery of the output shaft 10, and the first outer ring 32 is fastened to the housing 200, so that the output shaft 10 is rotatably supported by the housing 200 through the first bearing 30. The locking sleeve 20 is sleeved and riveted to the output shaft 10, thereby cooperating with the housing 200 to realize reliable axial limiting of the first bearing 30. The output shaft 10 is provided with a limiting portion 11, and the locking sleeve 20 is correspondingly provided with a limiting and mating portion 21, and the two cooperate with each other to limit the relative rotation between the locking sleeve 20 and the output shaft 10. In the present utility model, through the design of the circumferential limiting structure between the output shaft 10 and the locking sleeve 20, the situation that the two are loosened due to relative rotation during the operation of the reducer assembly 1000 is avoided. In this way, it is not easy for the locking sleeve 20 and the output shaft 10 to be loosened, realizing reliable axial limiting of the first bearing 30, and improving the stability and service life of the reducer assembly 1000.

[0055] In an alternative embodiment, please refer to FIG. Figures 5 to 11, the limiting portion 11 is a groove 12 recessed in the outer peripheral side of the output shaft 10, and the limiting and mating portion 21 is a protrusion 22 protruding from the inner peripheral side of the locking sleeve 20. Preferably, the protrusion 22 is integrally formed with the locking sleeve 20. In this way, when the protrusion 22 is inserted into the groove 12, the rotation of the locking sleeve 20 relative to the output shaft 10 can be restricted. It can be understood that the installation positions of the groove 12 and the protrusion 22 can also be swapped. For example, the limiting portion 11 is a protrusion 22 protruding from the outer peripheral side of the output shaft 10, and the limiting and mating portion 21 is a groove 12 recessed in the inner peripheral side of the locking sleeve 20. In this way, the circumferential limitation between the output shaft 10 and the locking sleeve 20 is realized through the cooperation of the protrusion 22 and the groove 12, and the structure is simple and reliable. As shown in the figure, an operation notch is generally provided on the outer periphery of the locking sleeve 20 for fixing an operation tool, so that the riveting operation can be carried out more easily.

[0056] Further, the groove 12 has an opening 121 at one end axially relatively close to the protrusion 22, and includes inner side walls 122 disposed on both sides of the opening 121 in the radial direction. The protrusion 22 is inserted into the groove 12 from the opening 121, and both sides of the protrusion 22 in the radial direction are correspondingly abutted against the two inner side walls 122. In this way, during the process of assembling the locking sleeve 20 onto the output shaft 10, it is only necessary to sleeved it on the outer periphery of the output shaft 10 and perform a riveting operation, then the protrusion 22 can be inserted into the groove 12 from the opening 121. The assembly is simple, and the riveting connection strength can be enhanced, further improving the locking reliability of the locking assembly 100.

[0057] Further, preferably, the depth of the groove 12 gradually increases in the direction close to the protrusion 22; and / or, the protruding height of the protrusion 22 gradually decreases in the direction close to the groove 12. In this way, the gap between the protrusion 22 and the inner wall of the groove 12 becomes smaller and smaller during the insertion process, achieving a wedging effect. On the one hand, the friction force between the two increases, making the connection between the locking sleeve 20 and the output shaft 10 more reliable. On the other hand, the axial position between the nut sleeve and the output shaft 10 is limited, avoiding that the locking sleeve 20 is axially sleeved too deep and damaging the first bearing 30 during the riveting operation.

[0058] Please continue to refer to Figure 7 and Figure 9, the groove 12 further has a bottom wall 123 extending between two inner side walls 122, and the bottom wall 123 is arranged as a concave arc surface. In this embodiment, the bottom wall 123 with the arc surface extension gradually increases in height from the opening 121 in the direction away from the opening 121 until it is flush with the outer circumference of the output shaft 10. The corresponding convex block 22 can be arranged as a thin sheet structure with a constant protruding height. During the process of riveting the locking sleeve 20 to the outer circumference of the output shaft 10, the convex block 22 gradually wedges into the groove 12, and the gap between the convex block 22 and the bottom wall 123 becomes smaller and smaller, the frictional force becomes larger and larger, the riveting resistance becomes larger and larger, and the initial growth rate of the riveting resistance is smaller, while the later growth rate is larger. When the operator can clearly feel the change in resistance, the riveting can be stopped. At this time, the locking sleeve 20 is riveted in place with the output shaft 10, and the limiting surface 23 just abuts against the inner ring of the first bearing 30.

[0059] Based on the above embodiments, please continue to refer to Figure 3 and Figure 8 , a first stepped surface 13 is formed on the outer circumference of the output shaft 10. The first stepped surface 13 and the locking sleeve 20 are distributed on opposite sides of the first bearing 30 in the axial direction, and the first inner ring 31 is clamped between the locking sleeve 20 and the first stepped surface 13. In this embodiment, it is preferred that the first stepped surface 13 is integrally formed on the outer circumference of the output shaft 10. The outer diameter of the output shaft 10 is smaller than the inner ring between the first stepped surfaces 13, and the outer diameter of the output shaft 10 is larger than the inner ring after the first stepped surface 13. The first stepped surface 13 is formed by the change in the outer diameter of the output shaft 10. In this way, the forming process of the output shaft 10 is simple and the structural strength is good. During the assembly process, the first bearing 30 can be first sleeved on the outer circumference of the output shaft 10, and then the locking sleeve 20 is riveted to the outer circumference of the output shaft 10. Through the wedging fit between the groove 12 and the convex block 22, the locking sleeve 20 is riveted in place. The operation is simple and more accurate, while avoiding the relative rotation of the locking sleeve 20 with respect to the output shaft 10, improving the reliability and service life of the product.

[0060] Based on the above embodiments, please refer to Figure 2 , Figure 5 , Figure 12 and Figure 13The reducer assembly 1000 further includes a bearing pressure plate 80 mounted on the housing 200, preferably detachably connected to the end of the housing 200 by bolts. A through hole 81 is provided on the bearing pressure plate 80, and the bearing pressure plate 80 is covered on the outer side of the second shaft hole 52. The housing 200 is provided with a first flange 53 on the inner side of the second shaft hole 52. Preferably, the first flange 53 is integrally formed on the inner wall of the housing 200, and is generally set to an annular structure, which can be a continuous annular structure or a discontinuous annular structure. The first outer ring 32 is fastened to the inner wall of the housing 200 and sandwiched between the first flange 53 and the bearing pressure plate 80, and the output shaft 10 passes through the through hole 81. In this embodiment, the first outer ring 32 is installed by using the structure of the housing 200 itself and the bearing pressure plate 80 assembled on the housing 200, which can not only reliably fasten the first outer ring 32, but also use a simple structure to limit the first bearing 30 relative to the housing 200 in the axial direction.

[0061] For further information, please refer to Figure 2 and Figure 5 The reduction transmission assembly 300 includes at least one set of planetary transmission groups, and at least one set of planetary transmission groups is arranged in series in a transmission direction, wherein the output shaft 10 should be connected to the output end of the last stage of the planetary transmission group.

[0062] Based on the above examples, please refer to Figure 2 and Figure 5 In this embodiment, the reduction transmission assembly 300 includes a two-stage planetary transmission group, specifically, a first planetary transmission group 301 and a second planetary transmission group 302. The first planetary transmission group 301 is installed in the installation cavity 50, and the first planetary transmission group 301 includes a first sun gear 60, a plurality of first planetary gears 61, a first ring gear 62, and a first planet carrier 63, wherein the first sun gear 60 is connected to the input shaft 400 inserted into the installation cavity 50 from the first shaft hole 51 as an input end, the first ring gear 62 is fixed to the housing 200 and sleeved on the periphery of the plurality of first planetary gears 61, and the first planet carrier 63 connects the plurality of first planetary gears 61.

[0063] The second planetary transmission group 302 includes a second planetary carrier 73 and a second sun gear 70 installed in the installation cavity 50, a plurality of second planetary gears 71, and a second ring gear 72, wherein the second sun gear 70 is connected to the shaft of the first planetary carrier 63, the second ring gear 72 is sleeved on the periphery of the plurality of second planetary gears 71, one end of the second planetary carrier 73 is connected to the plurality of second planetary gears 71, and the other end constitutes an output end, and is connected to the output shaft 10 through shaft transmission.

[0064] In this embodiment, the input shaft 400 transmits torque to the first sun gear 60. The first planet gear 61 meshes with the first sun gear 60 for transmission, and the torque is output through the first planet carrier 63 to achieve primary reduction. The primary planet carrier is axially connected to the second sun gear 70 to transmit torque to the second sun gear 70. The second planet gear 71 meshes with the second sun gear 70 for transmission, and the torque is output through the second planet carrier 73 to achieve secondary reduction. Thus, two-stage reduction is achieved through the first planetary transmission group 301 and the second planetary transmission group 302 in this embodiment.

[0065] Among them, the output shaft 10 and the second planet carrier 73 can be axially connected by various means. For example, they can be integrally provided, connected by a shaft hub, or key-connected. In a preferred embodiment, please refer to Figure 2 、 Figures 14 to 17 , a limiting ring is convexly provided on the outer periphery of the output shaft 10, and a spline is provided on the output shaft 10 on the side of the limiting ring away from the through hole 81. The second planet carrier 73 includes an annular frame 731 sleeved on the outer periphery of a plurality of second planet gears 71 and fixing each second planet gear 71, and a first shaft sleeve 732 and a second shaft sleeve 733 respectively convexly provided on both sides of the annular frame 731. Among them, the first shaft sleeve 732 is relatively close to the output shaft 10 and axially penetrates a spline hole, and the spline hole cooperates with the spline on the output shaft 10, so that the output shaft 10 is spline-connected to the second planet carrier 73. Thus, on the one hand, the torque is stably transmitted, and on the other hand, the output shaft 10 can be conveniently assembled. The first shaft sleeve 732 also abuts against the limiting ring. Preferably, it is fixed to the limiting ring by bolts to strengthen the connection between the output shaft 10 and the planetary mounting frame.

[0066] Please continue to refer to Figure 4 , a second bearing 40 is sleeved on the second shaft sleeve 733. The second bearing 40 includes a second inner ring 41 and a second outer ring 42 arranged in sequence along the inner and outer rings. It can be understood that balls or other components for reducing rotational friction are provided between the second inner ring 41 and the second outer ring 42. In this embodiment, the second bearing 40 acts between the second planet carrier 73 and the housing 200. Specifically, the second inner ring 41 is fastened to the outer periphery of the second shaft sleeve 733, and the second outer ring 42 is fastened to the inner wall of the housing 200. The second bearing 40 plays a role in supporting the rotation of the second planet carrier 73 so that it can stably transmit torque.

[0067] Furthermore, for assembling the second bearing 40, please refer to Figure 4, on the inner wall of the housing 200, a first mounting groove 55 and a second flange 54 are arranged in sequence axially. The first mounting groove 55 and the second flange 54 extend annularly respectively, and can extend continuously along the ring or intermittently along the ring. A plurality of first retaining pieces 91 spaced circumferentially are inserted in the first mounting groove 55. The second outer ring 42 is clamped between the plurality of first retaining pieces 91 and the second flange 54. Preferably, each first retaining piece 91 is fixed to the second outer ring 42. In this embodiment, the second outer ring 42 is reliably fastened to the inside of the housing 200 by the cooperation of the first retaining piece 91 and the second flange 54, with a simple and reliable structure and easy assembly.

[0068] Optionally, on the outer periphery of the second bushing 733, a second step surface 93 and a second mounting groove 90 are arranged in sequence axially. The second step surface 93 and the second mounting groove 90 extend annularly respectively, and can extend continuously along the ring or intermittently along the ring. A plurality of second retaining pieces 92 spaced circumferentially are inserted in the second mounting groove 90. The second inner ring 41 is clamped between the plurality of second retaining pieces 92 and the second step surface 93. In this embodiment, the second inner ring 41 is reliably fastened to the outer periphery of the second bushing 733 by the cooperation of the second retaining piece 92 and the second step surface 93, with a simple and reliable structure and easy assembly.

[0069] It can be understood that the above two embodiments can be implemented separately or in combination.

[0070] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, those of ordinary skill in the art can make other different forms of changes or variations without creative efforts, and all of them should fall within the protection scope of the present invention.

Claims

1. A locking assembly, characterized in that, Comprising: An output shaft, on which a limiting portion is provided; A first bearing sleeved on the output shaft, the first bearing including a first inner ring and a first outer ring arranged in sequence along the inner and outer rings, the first inner ring being fastened to the outer periphery of the output shaft; and, A locking sleeve sleeved and riveted on the output shaft, the locking sleeve being arranged on one axial side of the first bearing and having a limiting surface axially abutting against the first inner ring, a limiting and mating portion being provided on the locking sleeve, the limiting portion being matched with the limiting and mating portion to limit the relative rotation between the locking sleeve and the output shaft.

2. The locking assembly according to claim 1, characterized in that, The limiting portion is a groove recessed on the outer peripheral side of the output shaft, and the limiting and mating portion is a protrusion protruding from the inner peripheral side of the locking sleeve; or, the limiting portion is a protrusion protruding from the outer peripheral side of the output shaft, and the limiting and mating portion is a groove recessed from the inner peripheral side of the locking sleeve; The groove has an opening at one end axially relatively close to the protrusion, and includes inner side walls respectively arranged on two radial sides of the opening, the protrusion being inserted into the groove from the opening, and two radial sides of the protrusion respectively abutting against the two inner side walls correspondingly.

3. The locking assembly according to claim 2, wherein The depth of the groove gradually increases in the direction close to the protrusion; and / or, The protruding height of the protrusion gradually decreases in the direction close to the groove.

4. The locking assembly according to claim 3, characterized in that, The groove further has a bottom wall extending between the two inner side walls, and the bottom wall is arranged as an inwardly concave arc surface.

5. The locking assembly according to any one of claims 1 to 4, characterized in that, A first step surface is formed on the outer periphery of the output shaft, the first step surface and the locking sleeve are distributed on two opposite axial sides of the first bearing, and the first inner ring is clamped between the locking sleeve and the first step surface.

6. A speed reducer assembly, characterized in that, Comprising: A housing having an installation cavity, a first shaft hole and a second shaft hole being opened on the housing, the first shaft hole and the second shaft hole respectively communicating with the installation cavity; The locking assembly according to any one of claims 1 to 5, wherein the output shaft extends out of the installation cavity from the second shaft hole; and, A speed reduction and transmission assembly installed in the installation cavity and having an input end and an output end, the input end being shaft-connected to an input shaft inserted into the installation cavity from the first shaft hole, and the output end being shaft-connected to the output shaft.

7. The speed reducer assembly according to claim 6, wherein, The speed reducer assembly further includes a bearing pressing plate installed on the housing, the bearing pressing plate being provided with a through hole and covering the outside of the second shaft hole, a first flange being correspondingly arranged on the inner side of the housing corresponding to the second shaft hole, the first outer ring being fastened to the inner wall of the housing and clamped between the first flange and the bearing pressing plate, and the output shaft passing through the through hole.

8. The speed reducer assembly according to claim 6, wherein, The speed reduction and transmission assembly includes: A first planetary transmission group installed in the installation cavity, the first planetary transmission group including a first sun gear, a plurality of first planetary gears, a first ring gear, and a first planetary carrier, the first ring gear being fixed to the housing and sleeved on the periphery of the plurality of first planetary gears, the first planetary carrier connecting the plurality of first planetary gears, wherein the first sun gear constitutes the input end; and, The second planetary gear set includes a second planetary carrier and a second sun gear, a plurality of second planetary gears, and a second ring gear disposed in the installation cavity. The second sun gear is axially connected to the first planetary carrier. The second ring gear is sleeved around the plurality of second planetary gears. One end of the second planetary carrier is connected to the plurality of second planetary gears, and the other end of the second planetary carrier forms the output end.

9. The speed reducer assembly according to claim 8, wherein, The speed reducer assembly further includes a second bearing, and the second bearing includes a second inner ring and a second outer ring sequentially arranged along the inner and outer rings; The second planetary carrier includes a ring frame sleeved around the plurality of second planetary gears, and a first shaft sleeve and a second shaft sleeve respectively protruding from both sides of the ring frame. The first shaft sleeve is splined to the output shaft. The second bearing is sleeved on the second shaft sleeve. The second inner ring is fastened to the outer periphery of the second shaft sleeve, and the second outer ring is fastened to the inner wall of the housing.

10. The speed reducer assembly according to claim 9, characterized in that, The inner wall of the housing is provided with a first installation groove and a second flange axially distributed in sequence. The first installation groove and the second flange respectively extend in a ring shape. A plurality of first retaining pieces spaced in the circumferential direction are inserted into the first installation groove. The second outer ring is clamped between the plurality of first retaining pieces and the second flange; and / or The outer periphery of the second shaft sleeve is provided with a second step surface and a second installation groove axially distributed in sequence. The second step surface and the second installation groove respectively extend in a ring shape. A plurality of second retaining pieces spaced in the circumferential direction are inserted into the second installation groove. The second inner ring is clamped between the plurality of second retaining pieces and the second step surface.

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