A gear box and automobile tail door motor assembly

Abstract

This application discloses a gearbox and an automotive tailgate motor assembly, comprising a housing and a gear assembly. The housing includes an end cover and a gear housing. The gear assembly includes a first planetary assembly and a gear ring. A gear ring groove is formed on the inner wall of one end of the gear housing. The gear ring is inserted into the gear ring groove and abuts against the gear ring groove. The first planetary assembly is partially located within the gear ring, and the gear ring only meshes with the first planetary assembly. The end cover is inserted into the gear ring groove and abuts against the gear ring, and the end cover is radially screwed to the gear housing. This application has the advantages of ensuring uniform load distribution in the gearbox, increasing the strength of the gear ring, and reducing the complexity of the gearbox manufacturing process.

Description

Technical Field

[0001] This application relates to the field of gearbox technology, and in particular to a gearbox and an automotive tailgate motor assembly. Background Technology

[0002] Most gearboxes use two- or three-stage planetary gear mechanisms. Their function is to gradually reduce the motor speed through each stage of the planetary gear mechanism, thereby increasing the motor output torque to adapt to high-load application scenarios.

[0003] In existing technologies, there are two methods for limiting the internal gear ring: one is to connect it radially to the housing; the other is to add protrusions or grooves to the internal gear ring to connect it to the first planetary carrier for positioning. However, this arrangement increases the structural and connection complexity of the internal gear ring, presenting significant drawbacks. On the one hand, increasing the connection complexity of the internal gear ring leads to uneven stress distribution throughout the ring, reducing its strength; on the other hand, increasing the structural complexity complicates the manufacturing process, indicating room for further improvement in this technology. Utility Model Content

[0004] This application proposes a gearbox and an automotive tailgate motor assembly, the purpose of which is to ensure uniform load distribution in the gearbox, increase the strength of the gear ring, and reduce the complexity of the gearbox manufacturing process.

[0005] The specific measures are as follows: First, the gearbox reduces unnecessary connections between the gear ring and the housing, and uses end covers and gear housings to compactly limit the gear ring, thereby ensuring the strength of the gear ring; second, the separation of the gear ring and the housing optimizes the load distribution of the gearbox; finally, by retaining only the connection between the gear ring and the first planetary gear, the structural complexity of the gear ring is reduced, the gear ring manufacturing process is simplified, and thus the production cost of the gearbox is reduced.

[0006] The gearbox and automotive tailgate motor assembly provided in this application adopt the following technical solution:

[0007] A gearbox includes a housing and a gear assembly. The housing includes an end cover and a gear housing. The gear assembly includes a first planetary assembly and a gear ring. A gear ring groove is formed on the inner wall of one end of the gear housing. The gear ring is inserted into the gear ring groove and abuts against the gear ring groove. The first planetary assembly is partially located inside the gear ring, and the gear ring only meshes with the first planetary assembly. The end cover is inserted into the gear ring groove and abuts against the gear ring. The end cover is radially screwed to the gear housing.

[0008] By adopting the above technical solution, the gearbox of this utility model has the following advantages compared with the prior art: First, the end cover is connected to the gear housing, which limits and secures the gear assembly inside the end cover and gear housing solely by axial contact, making the components inside the gearbox more stable and reducing the use of bolts for axial positioning of the gearbox, as well as reducing the number of holes for fitting bolts inside the gearbox, thus resulting in better gearbox strength; Second, the gear ring is positioned by the end cover and gear housing through the gear ring groove, ensuring that the position is fixed without damage or breakage, and that the gear ring is subjected to uniform force, thus guaranteeing the strength of the internal gear ring; Third, separating the gear ring and the housing allows the gear ring to make slight displacements within the housing, avoiding production and installation errors and uniformly distributing the gearbox load; Fourth, the gear ring only meshes with the first planetary assembly, simplifying the function of the gear ring, which only needs to have teeth that mesh with the first planetary assembly, reducing the complexity of the gear ring structure, simplifying the gear ring manufacturing process, and thus reducing the production cost of the gearbox.

[0009] Preferably, the outer wall of the toothed ring at the end away from the end cap has a first groove, and the toothed ring groove is a stepped groove that mates with the toothed ring, and the first groove of the toothed ring engages with the toothed ring groove.

[0010] By adopting the above technical solution, the gear ring is divided into a meshing end and a non-meshing end. On the one hand, the gear ring increases the contact points between the gear ring and the gear housing through the cooperation of the first groove and the gear ring groove, thereby strengthening the connection stability between the gear ring and the gear housing. On the other hand, the partial meshing of the gear ring with the first groove and the gear ring groove can not only strengthen the fixed connection strength between the gear ring and the gear housing, but also increase the probability that the gear ring will not rotate in the gear ring groove, ensuring that the first planetary gear can rotate stably in the gear ring, thereby optimizing the overall transmission accuracy of the gearbox. Furthermore, the non-meshing end facilitates the removal of the gear ring and reduces costs.

[0011] Preferably, the first planetary assembly includes a first planet carrier, a first planet gear, and a carrier. One end of the first planet gear is connected to the first planet carrier, and the other end is connected to the carrier. The first planet gear is located inside the gear ring and meshes with the gear ring. The carrier abuts against the end cap. A sun gear is meshed with the first planet gear.

[0012] By adopting the above technical solution, the sun gear is driven by the rotation of the motor, the sun gear drives the first planetary gear, the first planetary gear rotates in the gear ring and drives the first planetary carrier to move. Through the abutment of the carrier and the end cover, the overall structure of the first planetary assembly is compact. Compared with the prior art, the compact first planetary assembly makes it easier to reduce the axial connection screws of the gearbox as a whole, thereby making the overall structure of the gearbox stronger and the overall precision of the gearbox better.

[0013] Preferably, the first planetary carrier includes a gear tooth portion and a connecting portion. The outer diameter of the connecting portion is larger than that of the gear tooth portion. The connecting portion has a first rotating shaft for connecting the first planetary gear evenly arranged around its end away from the gear tooth portion, and the connecting portion has a sun gear groove in the axial direction at its end away from the gear tooth portion.

[0014] By adopting the above technical solution, the sun gear can also undergo a certain range of axial displacement within the sun gear slot, allowing it to float axially within the housing and facilitating the even distribution of load. Simultaneously, by creating the sun gear slot in the first planetary carrier, the overall structure of the first planetary carrier is simplified, facilitating its production and thus reducing the production cost of the gearbox.

[0015] Preferably, the sun gear has a first through hole in the axial direction, and the first planet carrier has a second through hole in the axial direction, the inner diameter of the second through hole being equal to the inner diameter of the first through hole.

[0016] By adopting the above technical solution, the sun gear is connected to the motor through the first through hole, and the second through hole of the first planetary carrier not only provides space for the connection between the sun gear and the motor, but also makes the first planetary carrier more economical in terms of material.

[0017] Preferably, the gear assembly further includes a second planetary assembly, which includes a second planetary carrier and a second planetary gear. The second planetary carrier is inserted into the gear housing, the second planetary gear is inserted into the second planetary carrier, the second planetary gear meshes with the gear teeth, and the second planetary carrier abuts against one end of the connecting portion near the gear teeth.

[0018] By adopting the above technical solution, the abutment between the second planetary assembly and the first planetary assembly makes the gearbox assembly in the axial direction more compact, thereby reducing the use of axial connecting screws in the gearbox as a whole, resulting in higher overall structural strength and better overall precision of the gearbox.

[0019] Preferably, the first planetary carrier has a second rotating shaft evenly arranged around one end near the gear teeth for connecting the second planetary gear, and the first planetary carrier has a first planetary groove at a position corresponding to the gear teeth.

[0020] By adopting the above technical solution, the first planetary carrier can also undergo a certain range of axial displacement within the first planetary slot, allowing the first planetary carrier to float axially within the housing. This facilitates the uniform distribution of load on the first planetary carrier, while also saving materials for the second planetary assembly and reducing its overall production cost.

[0021] Preferably, the second planetary gear has a second connecting protrusion at its end, and the connecting portion has a first connecting protrusion at one end near the gear teeth, with the second connecting protrusion corresponding to the first connecting protrusion.

[0022] By adopting the above technical solution, the contact area between the second planetary gear and the connecting part is reduced by the first connecting protrusion and the second connecting protrusion, thus reducing friction, while ensuring that the second planetary gear is supported by the second planetary carrier and the connecting part.

[0023] Preferably, one end of the end cap is flush with one end of the gear housing.

[0024] By adopting the above technical solution, it is convenient to position the end cover and gear housing during assembly, and also convenient to position the gearbox for subsequent connection with the motor.

[0025] A tailgate motor assembly for automobiles includes a motor and the aforementioned gearbox. The gearbox includes a sun gear and an end cover. The end cover is bolted to the motor in the axial direction, and the motor is plugged into the sun gear.

[0026] By adopting the above technical solution, the motor and the end cover are axially connected, so that the motor and the gearbox are stably connected. The motor drives the sun gear, which in turn drives the first gear assembly and the second gear assembly in sequence, thereby realizing the adjustment of the load.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. First, the end cover is connected to the gear housing, limiting and securing the gear assembly inside the end cover and gear housing solely through axial contact. This ensures greater stability of the components within the gearbox and reduces the use of axial limiting bolts and the number of holes required for fitting bolts to parts within the gearbox, thus resulting in superior gearbox strength. Second, the gear ring is positioned by the end cover and gear housing through the gear ring groove, ensuring no damage or breakage. The gear ring is subjected to uniform stress, guaranteeing the strength of the internal gear ring. Then, the gear ring and housing are separated, allowing for slight displacement of the gear ring within the housing. This avoids production and installation errors and balances the gearbox load. Furthermore, the gear ring only meshes with the first planetary assembly, simplifying its function. The gear ring only needs teeth to mesh with the first planetary assembly, reducing structural complexity and simplifying the gear ring manufacturing process, thereby lowering gearbox production costs.

[0029] 2. The gear ring is divided into a meshing end and a non-meshing end. On the one hand, the gear ring increases the contact points between the gear ring and the gear housing through the cooperation of the first groove and the gear ring groove, thereby strengthening the connection stability between the gear ring and the gear housing. On the other hand, the partial meshing of the gear ring with the first groove and the gear ring groove can not only strengthen the fixed connection strength between the gear ring and the gear housing, but also increase the probability that the gear ring will not rotate in the gear ring groove, ensuring that the first planetary gear can rotate stably in the gear ring, thereby optimizing the overall transmission accuracy of the gearbox. Furthermore, the non-meshing end facilitates the removal of the gear ring and reduces costs.

[0030] 3. The sun gear is connected to the motor through the first through hole. The second through hole of the first planetary carrier not only provides space for the connection between the sun gear and the motor, but also makes the first planetary carrier more economical in terms of material. The first planetary carrier can also make a certain range of axial displacement in the first planetary slot, so that the first planetary carrier can float axially in the housing, which facilitates the uniform distribution of load on the first planetary carrier, while saving the material of the second planetary assembly and reducing its overall production cost. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the automotive tailgate motor assembly in Embodiment 2.

[0032] Figure 2 This is an exploded view of the gearbox in Embodiment 1.

[0033] Figure 3 This is a schematic diagram of the automotive tailgate motor assembly in Embodiment 2.

[0034] Figure 4 For along Figure 3 A cross-sectional view shown in the AA direction;

[0035] Figure 5 This is a schematic diagram of the gear housing structure in Embodiment 1.

[0036] Reference numerals: 1. Gearbox; 1.1. Housing; 1.1.1. End cover; 1.1.2. Gear housing; 1.1.3. Gear ring groove; 1.1.4. Gear groove; 1.2. Gear assembly; 1.2.1. First planetary assembly; 1.2.1.1. First planetary carrier; 1.2.1.2. Gear teeth; 1.2.1.3. Connecting part; 1.2.1.4. First rotating shaft; 1.2.1.5. Second through hole; 1.2.1.6. First connecting protrusion; 1.2.1.7. First planetary... 1.2.1.8, Rotating frame; 1.2.1.9, Sun gear slot; 1.2.2, Second planetary assembly; 1.2.2.1, Second planetary carrier; 1.2.2.2, Second planetary gear; 1.2.2.3, Second rotating shaft; 1.2.2.4, First planetary slot; 1.2.2.5, Second connecting protrusion; 1.2.2.6, Sleeve; 1.2.3, Gear ring; 1.2.3.1, First groove; 1.2.4, Sun gear; 1.2.4.1, First through hole; 2. Motor. Detailed Implementation

[0037] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0038] Example 1

[0039] This application discloses a gearbox 1.

[0040] Reference Figures 1-5 The system includes a housing 1.1 and a gear assembly 1.2. The housing 1.1 includes an end cap 1.1.1 and a gear housing 1.1.2. The gear assembly 1.2 includes a first planetary assembly 1.2.1, a second planetary assembly 1.2.2, and a gear ring 1.2.3. The second planetary assembly 1.2.2, the first planetary assembly 1.2.1, and the end cap 1.1.1 are arranged sequentially from left to right inside the gear housing 1.1.2. The gear ring 1.2.3 is located between the first planetary assembly 1.2.1 and the gear housing 1.1.2. The second planetary assembly 1.2.2 is partially located outside the gear housing 1.1.2.

[0041] The gear housing 1.1.2 is cylindrical. A first countersunk hole is formed at the right end of the gear housing 1.1.2. A third through hole is formed at the left end of the gear housing 1.1.2. The inner diameter of the third through hole is smaller than the inner diameter of the first countersunk hole. A gear groove 1.1.4 is formed on the inner wall of the left end of the first countersunk hole of the gear housing 1.1.2. A gear ring groove 1.1.3 is formed on the inner wall of the right end of the first countersunk hole of the gear housing 1.1.2. The inner diameter of the gear ring groove 1.1.3 is smaller than the inner diameter of the gear groove 1.1.4. The gear ring 1.2.3 is inserted into the gear ring groove 1.1.3 from the right end of the gear housing 1.1.2, such that the left end of the gear ring 1.2.3 abuts against the right end face of the gear groove 1.1.4.

[0042] The second planetary assembly 1.2.2 includes a second planetary carrier 1.2.2.1, a sleeve 1.2.2.6, and a second planetary gear 1.2.2.2. The right end of the sleeve 1.2.2.6 has a shaft protrusion. The sleeve 1.2.2.6 is tightly inserted into the third through hole of the gear housing 1.1.2, and the shaft protrusion of the sleeve 1.2.2.6 is tightly fitted with the right end face of the third through hole. The left end face of the sleeve 1.2.2.6 is flush with the left end face of the gear housing 1.1.2. The second planetary carrier 1.2.2.1 includes an insertion part and a transmission part. The outer diameter of the insertion part is smaller than the outer diameter of the transmission part. The transmission part is tightly inserted into the sleeve 1.2.2.6, and the left end face of the insertion part extends out of the sleeve 1.2.2.6. A limiting groove is opened on the outer wall of the left end of the insertion part, and a limiting piece is inserted into the limiting groove. The right end of the limiting piece is attached to the left end face of the sleeve 1.2.2.6. The outer diameter of the transmission part is equal to the outer diameter of the shaft of the sleeve 1.2.2.6. Four second rotating shafts 1.2.2.3 are evenly inserted into the right end of the transmission part in a ring. The second planetary gear 1.2.2.2 is sleeved on the second rotating shaft 1.2.2.3, and the second planetary gear 1.2.2.2 meshes with the gear groove 1.1.4.

[0043] The first planetary assembly 1.2.1 includes a first planet carrier 1.2.1.1, first planet gears 1.2.1.7, and first rotating shafts 1.2.1.4. The first planet carrier 1.2.1.1 includes a gear tooth portion 1.2.1.2 and a connecting portion 1.2.1.3. The outer diameter of the connecting portion 1.2.1.3 is larger than that of the gear tooth portion 1.2.1.2. The gear tooth portion 1.2.1.2 is located between the four second rotating shafts 1.2.2.3, and the gear tooth portion 1.2.1.2 meshes externally with the four second planet gears 1.2.2.2. The three first rotating shafts 1.2.1.4 are integrally formed on the right end of the connecting portion 1.2.1.3. The first rotating shafts 1.2.1.4 are ring-shaped. The components are evenly arranged, and the connecting parts 1.2.1.3 are integrally formed with mounting rods between the first rotating shafts 1.2.1.4. The three first planetary gears 1.2.1.7 are respectively sleeved on the three first rotating shafts 1.2.1.4. The three first planetary gears 1.2.1.7 mesh externally with the gear ring 1.2.3, and the gear ring 1.2.3 only meshes with the first planetary gears 1.2.1.7 without contacting other parts of the first planetary assembly 1.2.1. The sun gear 1.2.4 meshes internally between the three first planetary gears 1.2.1.7. The right ends of the three first rotating shafts 1.2.1.4 and the three mounting rods are sleeved with a rotating frame 1.2.1.8.

[0044] End cap 1.1.1 is inserted into gear ring groove 1.1.3 and abuts against gear ring 1.2.3. End cap 1.1.1 also presses against rotating carrier 1.2.1.8, tightening the insertion between rotating carrier 1.2.1.8 and first planetary carrier 1.2.1.1, thereby tightening the tight connection between first planetary assembly 1.2.1 and second planetary assembly 1.2.2. End cap 1.1.1 is radially screwed to gear housing 1.1.2.

[0045] The sun gear 1.2.4 is driven by the rotation of the motor 2. The sun gear 1.2.4 drives the first planetary gear 1.2.1.7. The first planetary gear 1.2.1.7 rotates in the gear ring 1.2.3, driving the first planetary carrier 1.2.1.1 to move. Through the contact between the carrier 1.2.1.8 and the end cover 1.1.1, the overall structure of the first planetary assembly 1.2.1 is compact. Furthermore, through the contact between the second planetary assembly 1.2.2 and the first planetary assembly 1.2.1, the axial assembly of the gearbox 1 is relatively compact. Compared with the prior art, the compact internal layout of the gearbox 1 makes it easier to reduce the number of axial connecting screws, thereby making the overall structural strength of the gearbox 1 higher and the overall precision of the gearbox 1 better.

[0046] This utility model also has the following advantages: First, the end cover 1.1.1 is connected to the gear housing 1.1.2, which limits and secures the gear assembly 1.2 inside the end cover 1.1.1 and the gear housing 1.1.2 solely through axial contact, making the components inside the gearbox 1 more stable and reducing the use of bolts for axial positioning of the gearbox 1, as well as reducing the number of holes for fitting bolts to the parts inside the gearbox 1, thus resulting in better strength of the gearbox 1; Second, the gear ring 1.2.3 is positioned and limited by the contact between the end cover 1.1.1 and the gear housing 1.1.2 through the gear ring groove 1.1.3, ensuring that the position is limited without causing damage or breakage. The gear ring 1.2.3 is subjected to uniform stress, ensuring the strength of the internal gear ring 1.2.3. Then, the gear ring 1.2.3 and the housing 1.1 are separated, allowing the gear ring 1.2.3 to make slight displacements within the housing 1.1, avoiding production and installation errors, and uniformly distributing the load on the gearbox 1. Furthermore, the gear ring 1.2.3 only meshes with the first planetary assembly 1.2.1, simplifying the function of the gear ring 1.2.3. The gear ring 1.2.3 only needs to have teeth that mesh with the first planetary assembly 1.2.1, reducing the structural complexity of the gear ring 1.2.3, simplifying the production process of the gear ring 1.2.3, and thus reducing the production cost of the gearbox 1.

[0047] Furthermore, in this embodiment, a first groove 1.2.3.1 is formed on the outer wall of the end of the gear ring 1.2.3 away from the end cap 1.1.1. The left end of the gear ring groove 1.1.3 is also integrally formed with a first protrusion that mates with the first groove 1.2.3.1. The gear ring groove 1.1.3 is a stepped groove. Teeth are formed on the first protrusion and the first groove 1.2.3.1. The first protrusion engages with the first groove 1.2.3.1, so that the gear ring 1.2.3 is divided into an engaging end and a non-engaging end. On the one hand, the gear ring 1.2.3 increases the number of gear rings 1.2 through the engagement of the first groove 1.2.3.1 and the gear ring groove 1.1.3. The contact point between the gear ring 1.2.3 and the gear housing 1.1.2 strengthens the connection stability between the gear ring 1.2.3 and the gear housing 1.1.2. On the other hand, the gear ring 1.2.3 partially meshes with the gear ring groove 1.1.3 through the first groove 1.2.3.1, which not only strengthens the fixed connection strength between the gear ring 1.2.3 and the gear housing 1.1.2, but also increases the probability that the gear ring 1.2.3 will not rotate in the gear ring groove 1.1.3, ensuring that the first planetary gear 1.2.1.7 can rotate stably in the gear ring 1.2.3, thereby optimizing the overall transmission accuracy of the gearbox 1. Furthermore, the non-meshing end facilitates the disengagement of the gear ring 1.2.3 and reduces costs.

[0048] Furthermore, in this embodiment, a second connecting protrusion 1.2.2.5 is integrally formed on the right end of the second planetary gear 1.2.2.2, and a first connecting protrusion 1.2.1.6 is integrally formed on the end of the connecting portion 1.2.1.3 near the gear tooth portion 1.2.1.2. When the second planetary assembly 1.2.2 abuts against the first planetary assembly 1.2.1, the second connecting protrusion 1.2.2.5 of the second planetary gear 1.2.2.2 contacts the first connecting protrusion 1.2.1.6 of the connecting portion 1.2.1.3. This reduces the contact area and friction between the second planetary gear 1.2.2.2 and the connecting portion 1.2.1.3 through the first connecting protrusion 1.2.1.6 and the second connecting protrusion 1.2.2.5, while also ensuring that the second planetary gear 1.2.2.2 is supported by the second planetary carrier 1.2.2.1 and the connecting portion 1.2.1.3.

[0049] Furthermore, in this embodiment, the connecting part 1.2.1.3 has a sun gear groove 1.2.1.9 in the axial direction at the end away from the gear tooth part 1.2.1.2, so that the sun gear 1.2.4 can be axially displaced within a certain range in the sun gear groove 1.2.1.9, so that the sun gear 1.2.4 can float axially within the housing 1.1, which facilitates the uniform distribution of load on the sun gear 1.2.4. Meanwhile, by opening the sun gear groove 1.2.1.9 in the first planetary carrier 1.2.1.1, the overall structure of the first planetary carrier 1.2.1.1 is made simpler, which facilitates the production of the first planetary carrier 1.2.1.1 and thus reduces the production cost of gearbox 1. The second planetary carrier 1.2.2.1 has a first planetary groove 1.2.2.4 at the right end corresponding to the gear tooth part 1.2.1.2, which allows the first planetary carrier 1.2.1.1 to undergo a certain range of axial displacement within the first planetary groove 1.2.2.4. This allows the first planetary carrier 1.2.1.1 to float axially within the housing 1.1, which facilitates the even distribution of load on the first planetary carrier 1.2.1.1 and saves material for the second planetary assembly 1.2.2, reducing its overall production cost.

[0050] Furthermore, in this embodiment, the sun gear 1.2.4 has a first through hole 1.2.4.1 in the axial direction, and the first planetary carrier 1.2.1.1 has a second through hole 1.2.1.5 in the axial direction. The inner diameter of the second through hole 1.2.1.5 is equal to the inner diameter of the first through hole 1.2.4.1. The sun gear 1.2.4 is connected to the motor 2 through the first through hole 1.2.4.1. The second through hole 1.2.1.5 of the first planetary carrier 1.2.1.1 not only provides space for the connection between the sun gear 1.2.4 and the motor 2, but also makes the first planetary carrier 1.2.1.1 more material-efficient.

[0051] Furthermore, in this embodiment, the right end of the end cover 1.1.1 is flush with the right end of the gear housing 1.1.2, which facilitates the positioning of the end cover 1.1.1 and the gear housing 1.1.2 during assembly, and also facilitates the subsequent connection and positioning of the gearbox 1 with the motor 2.

[0052] Example 2

[0053] This application discloses an automobile tailgate motor assembly.

[0054] Reference Figures 1-5 The device includes a motor 2 and a gearbox 1. The gearbox 1 includes a sun gear 1.2.4 and an end cover 1.1.1. The motor 2 is inserted into the sun gear 1.2.4, and the end cover 1.1.1 abuts against the motor 2. The end cover 1.1.1 and the motor 2 are bolted together in the axial direction.

[0055] The structure of motor 2 is existing technology and will not be described in detail here.

[0056] The gearbox 1 includes a housing 1.1 and a gear assembly 1.2. The housing 1.1 includes an end cover 1.1.1 and a gear housing 1.1.2. The gear assembly 1.2 includes a first planetary assembly 1.2.1, a second planetary assembly 1.2.2, and a gear ring 1.2.3. The second planetary assembly 1.2.2, the first planetary assembly 1.2.1, and the end cover 1.1.1 are arranged sequentially from left to right inside the gear housing 1.1.2. The gear ring 1.2.3 is located between the first planetary assembly 1.2.1 and the gear housing 1.1.2. The second planetary assembly 1.2.2 is partially located outside the gear housing 1.1.2.

[0057] The gear housing 1.1.2 is cylindrical. A first countersunk hole is formed at the right end of the gear housing 1.1.2. A third through hole is formed at the left end of the gear housing 1.1.2. The inner diameter of the third through hole is smaller than the inner diameter of the first countersunk hole. A gear groove 1.1.4 is formed on the inner wall of the left end of the first countersunk hole of the gear housing 1.1.2. A gear ring groove 1.1.3 is formed on the inner wall of the right end of the first countersunk hole of the gear housing 1.1.2. The inner diameter of the gear ring groove 1.1.3 is smaller than the inner diameter of the gear groove 1.1.4. The gear ring 1.2.3 is inserted into the gear ring groove 1.1.3 from the right end of the gear housing 1.1.2, such that the left end of the gear ring 1.2.3 abuts against the right end face of the gear groove 1.1.4.

[0058] The second planetary assembly 1.2.2 includes a second planetary carrier 1.2.2.1, a sleeve 1.2.2.6, and a second planetary gear 1.2.2.2. The right end of the sleeve 1.2.2.6 has a shaft protrusion. The sleeve 1.2.2.6 is tightly inserted into the third through hole of the gear housing 1.1.2, and the shaft protrusion of the sleeve 1.2.2.6 is tightly fitted with the right end face of the third through hole. The left end face of the sleeve 1.2.2.6 is flush with the left end face of the gear housing 1.1.2. The second planetary carrier 1.2.2.1 includes an insertion part and a transmission part. The outer diameter of the insertion part is smaller than the outer diameter of the transmission part. The transmission part is tightly inserted into the sleeve 1.2.2.6, and the left end face of the insertion part extends out of the sleeve 1.2.2.6. A limiting groove is opened on the outer wall of the left end of the insertion part, and a limiting piece is inserted into the limiting groove. The right end of the limiting piece is attached to the left end face of the sleeve 1.2.2.6. The outer diameter of the transmission part is equal to the outer diameter of the shaft of the sleeve 1.2.2.6. Four second rotating shafts 1.2.2.3 are evenly inserted into the right end of the transmission part in a ring. The second planetary gear 1.2.2.2 is sleeved on the second rotating shaft 1.2.2.3, and the second planetary gear 1.2.2.2 meshes with the gear groove 1.1.4.

[0059] The first planetary assembly 1.2.1 includes a first planet carrier 1.2.1.1, first planet gears 1.2.1.7, and first rotating shafts 1.2.1.4. The first planet carrier 1.2.1.1 includes a gear tooth portion 1.2.1.2 and a connecting portion 1.2.1.3. The outer diameter of the connecting portion 1.2.1.3 is larger than that of the gear tooth portion 1.2.1.2. The gear tooth portion 1.2.1.2 is located between the four second rotating shafts 1.2.2.3, and the gear tooth portion 1.2.1.2 meshes externally with the four second planet gears 1.2.2.2. The three first rotating shafts 1.2.1.4 are integrally formed on the right end of the connecting portion 1.2.1.3. The first rotating shafts 1.2.1.4 are ring-shaped. The components are evenly arranged, and the connecting parts 1.2.1.3 are integrally formed with mounting rods between the first rotating shafts 1.2.1.4. The three first planetary gears 1.2.1.7 are respectively sleeved on the three first rotating shafts 1.2.1.4. The three first planetary gears 1.2.1.7 mesh externally with the gear ring 1.2.3, and the gear ring 1.2.3 only meshes with the first planetary gears 1.2.1.7 without contacting other parts of the first planetary assembly 1.2.1. The sun gear 1.2.4 meshes internally between the three first planetary gears 1.2.1.7. The right ends of the three first rotating shafts 1.2.1.4 and the three mounting rods are sleeved with a rotating frame 1.2.1.8.

[0060] End cap 1.1.1 is inserted into gear ring groove 1.1.3 and abuts against gear ring 1.2.3. End cap 1.1.1 also presses against rotating carrier 1.2.1.8, tightening the insertion between rotating carrier 1.2.1.8 and first planetary carrier 1.2.1.1, thereby tightening the tight connection between first planetary assembly 1.2.1 and second planetary assembly 1.2.2. End cap 1.1.1 is radially screwed to gear housing 1.1.2.

[0061] The sun gear 1.2.4 is driven by the rotation of the motor 2. The sun gear 1.2.4 drives the first planetary gear 1.2.1.7. The first planetary gear 1.2.1.7 rotates in the gear ring 1.2.3, driving the first planetary carrier 1.2.1.1 to move. Through the contact between the carrier 1.2.1.8 and the end cover 1.1.1, the overall structure of the first planetary assembly 1.2.1 is compact. Furthermore, through the contact between the second planetary assembly 1.2.2 and the first planetary assembly 1.2.1, the axial assembly of the gearbox 1 is relatively compact. Compared with the prior art, the compact internal layout of the gearbox 1 makes it easier to reduce the number of axial connecting screws, thereby making the overall structural strength of the gearbox 1 higher and the overall precision of the gearbox 1 better.

[0062] Furthermore, in this embodiment, a first groove 1.2.3.1 is formed on the outer wall of the end of the gear ring 1.2.3 away from the end cap 1.1.1. The left end of the gear ring groove 1.1.3 is also integrally formed with a first protrusion that mates with the first groove 1.2.3.1. The gear ring groove 1.1.3 is a stepped groove. Teeth are formed on the first protrusion and the first groove 1.2.3.1. The first protrusion engages with the first groove 1.2.3.1, so that the gear ring 1.2.3 is divided into an engaging end and a non-engaging end. On the one hand, the gear ring 1.2.3 increases the number of gear rings 1.2 through the engagement of the first groove 1.2.3.1 and the gear ring groove 1.1.3. The contact point between the gear ring 1.2.3 and the gear housing 1.1.2 strengthens the connection stability between the gear ring 1.2.3 and the gear housing 1.1.2. On the other hand, the gear ring 1.2.3 partially meshes with the gear ring groove 1.1.3 through the first groove 1.2.3.1, which not only strengthens the fixed connection strength between the gear ring 1.2.3 and the gear housing 1.1.2, but also increases the probability that the gear ring 1.2.3 will not rotate in the gear ring groove 1.1.3, ensuring that the first planetary gear 1.2.1.7 can rotate stably in the gear ring 1.2.3, thereby optimizing the overall transmission accuracy of the gearbox 1. Furthermore, the non-meshing end facilitates the disengagement of the gear ring 1.2.3 and reduces costs.

[0063] Furthermore, in this embodiment, a second connecting protrusion 1.2.2.5 is integrally formed on the right end of the second planetary gear 1.2.2.2, and a first connecting protrusion 1.2.1.6 is integrally formed on the end of the connecting portion 1.2.1.3 near the gear tooth portion 1.2.1.2. When the second planetary assembly 1.2.2 abuts against the first planetary assembly 1.2.1, the second connecting protrusion 1.2.2.5 of the second planetary gear 1.2.2.2 contacts the first connecting protrusion 1.2.1.6 of the connecting portion 1.2.1.3. This reduces the contact area and friction between the second planetary gear 1.2.2.2 and the connecting portion 1.2.1.3 through the first connecting protrusion 1.2.1.6 and the second connecting protrusion 1.2.2.5, while also ensuring that the second planetary gear 1.2.2.2 is supported by the second planetary carrier 1.2.2.1 and the connecting portion 1.2.1.3.

[0064] Furthermore, in this embodiment, the connecting part 1.2.1.3 has a sun gear groove 1.2.1.9 in the axial direction at the end away from the gear tooth part 1.2.1.2, so that the sun gear 1.2.4 can be axially displaced within a certain range in the sun gear groove 1.2.1.9, so that the sun gear 1.2.4 can float axially within the housing 1.1, which facilitates the uniform distribution of load on the sun gear 1.2.4. Meanwhile, by opening the sun gear groove 1.2.1.9 in the first planetary carrier 1.2.1.1, the overall structure of the first planetary carrier 1.2.1.1 is made simpler, which facilitates the production of the first planetary carrier 1.2.1.1 and thus reduces the production cost of gearbox 1. The second planetary carrier 1.2.2.1 has a first planetary groove 1.2.2.4 at the right end corresponding to the gear tooth part 1.2.1.2, which allows the first planetary carrier 1.2.1.1 to undergo a certain range of axial displacement within the first planetary groove 1.2.2.4. This allows the first planetary carrier 1.2.1.1 to float axially within the housing 1.1, which facilitates the even distribution of load on the first planetary carrier 1.2.1.1 and saves material for the second planetary assembly 1.2.2, reducing its overall production cost.

[0065] Furthermore, in this embodiment, the sun gear 1.2.4 has a first through hole 1.2.4.1 in the axial direction, and the first planetary carrier 1.2.1.1 has a second through hole 1.2.1.5 in the axial direction. The inner diameter of the second through hole 1.2.1.5 is equal to the inner diameter of the first through hole 1.2.4.1. The sun gear 1.2.4 is connected to the motor 2 through the first through hole 1.2.4.1. The second through hole 1.2.1.5 of the first planetary carrier 1.2.1.1 not only provides space for the connection between the sun gear 1.2.4 and the motor 2, but also makes the first planetary carrier 1.2.1.1 more material-efficient.

[0066] Furthermore, in this embodiment, the right end of the end cover 1.1.1 is flush with the right end of the gear housing 1.1.2, which facilitates the positioning of the end cover 1.1.1 and the gear housing 1.1.2 during assembly, and also facilitates the subsequent connection and positioning of the gearbox 1 with the motor 2.

[0067] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gearbox, characterised in that: The assembly includes a housing (1.1) and a gear assembly (1.2). The housing (1.1) includes an end cap (1.1.1) and a gear housing (1.1.2). The gear assembly (1.2) includes a first planetary assembly (1.2.1) and a gear ring (1.2.3). A gear ring groove (1.1.3) is formed on the inner wall of one end of the gear housing (1.1.2). The gear ring (1.2.3) is inserted into the gear ring groove (1.1.3). 2.3) The first planetary assembly (1.2.1) is partially located inside the gear ring (1.2.3) and the gear ring (1.2.3) only meshes with the first planetary assembly (1.2.1). The end cap (1.1.1) is inserted into the gear ring groove (1.1.3) and abuts against the gear ring (1.2.3). The end cap (1.1.1) is radially screwed to the gear housing (1.1.2).

2. The gear case of claim 1, wherein: The outer wall of the toothed ring (1.2.3) away from the end cap (1.1.1) has a first groove (1.2.3.1). The toothed ring groove (1.1.3) is a stepped groove that mates with the toothed ring (1.2.3). The first groove (1.2.3.1) of the toothed ring (1.2.3) meshes with the toothed ring groove (1.1.3).

3. The gear case of claim 1, wherein: The first planetary assembly (1.2.1) includes a first planet carrier (1.2.1.1), a first planetary gear (1.2.1.7), and a rotating carrier (1.2.1.8). One end of the first planetary gear (1.2.1.7) is connected to the first planet carrier (1.2.1.1), and the other end is connected to the rotating carrier (1.2.1.8). The first planetary gear (1.2.1.7) is located inside the gear ring (1.2.3) and meshes with the gear ring (1.2.3). The rotating carrier (1.2.1.8) abuts against the end cap (1.1.1). A sun gear (1.2.4) meshes with the first planetary gear (1.2.1.7).

4. The gear case of claim 3, wherein: The first planetary carrier (1.2.1.1) includes a gear tooth portion (1.2.1.2) and a connecting portion (1.2.1.3). The outer diameter of the connecting portion (1.2.1.3) is larger than that of the gear tooth portion (1.2.1.2). The connecting portion (1.2.1.3) has a first rotating shaft (1.2.1.4) uniformly arranged around the end away from the gear tooth portion (1.2.1.2) for connecting the first planetary gear (1.2.1.7). The connecting portion (1.2.1.3) has a sun gear groove (1.2.1.9) in the axial direction at the end away from the gear tooth portion (1.2.1.2).

5. The gear case of claim 3, wherein: The sun gear (1.2.4) has a first through hole (1.2.41) in the axial direction, and the first planet carrier (1.2.1.1) has a second through hole (1.2.1.5) in the axial direction. The inner diameter of the second through hole (1.2.1.5) is equal to the inner diameter of the first through hole (1.2.4.1).

6. The gear case of claim 4, wherein: The gear assembly (1.2) further includes a second planetary assembly (1.2.2), which includes a second planetary carrier (1.2.2.1) and a second planetary gear (1.2.2.2). The second planetary carrier (1.2.2.1) is inserted into the gear housing (1.1.2), and the second planetary gear (1.2.2.2) is inserted into the second planetary carrier (1.2.2.1). The second planetary gear (1.2.2.2) meshes externally with the gear teeth (1.2.1.2), and the second planetary carrier (1.2.2.1) abuts against the end of the connecting portion (1.2.1.3) near the gear teeth (1.2.1.2).

7. The gear case of claim 6, wherein: The first planetary carrier (1.2.1.1) has a second rotating shaft (1.2.2.3) evenly arranged around one end near the gear tooth portion (1.2.1.2) for connecting the second planetary gear (1.2.2.2), and the first planetary carrier has a first planetary groove (1.2.2.4) at a position corresponding to the gear tooth portion (1.2.1.2).

8. The gear case of claim 6, wherein: The second planetary gear (1.2.2.2) has a second connecting protrusion (1.2.2.5) at its end, and the connecting part (1.2.1.3) has a first connecting protrusion (1.2.1.6) at one end near the gear tooth part (1.2.1.2). The second connecting protrusion (1.2.2.5) corresponds to the first connecting protrusion (1.2.1.6).

9. The gear case of claim 1, wherein: One end of the end cap (1.1.1) is flush with one end of the gear housing (1.1.2).

10. A motor assembly for a tailgate of an automobile, characterized by: The device includes a motor (2) and a gearbox (1) as described in any one of claims 1-9, the gearbox (1) including a sun gear (1.2.4) and an end cap (1.1.1), the end cap (1.1.1) being bolted to the motor (2) in the axial direction, and the motor (2) being inserted into the sun gear (1.2.4).

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