Axial positioning structure of decelerator, electric drive assembly and carrier

Abstract

The utility model relates to vehicle technical field discloses a kind of reducer axial positioning structure, electric drive assembly and carrier, the reducer axial positioning structure includes: transmission shaft;Bearing, one end of transmission shaft is sleeved;Shell, is sleeved outside bearing, the inner wall of shell is equipped with first step surface, the outer ring of bearing and first step surface are in abutment;Annular locking member, it is sleeved on transmission shaft, and with the outer ring of bearing abuts, the outer wall of annular locking member is equipped with outer thread part, the inner wall of shell is equipped with the inner thread part compatible with outer thread part. By screwing annular locking member, so that annular locking member and bearing outer ring directly abut, to carry out axial fixation to bearing outer ring, replace traditional bearing outer ring clamping spring limit, eliminate the cooperation gap between traditional clamping spring and bearing outer ring, avoid bearing axial movement and bearing outer ring step different sound problem, improve driving experience, reduce the abnormal wear of reducer internal parts.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, specifically to a reducer axial positioning structure, an electric drive assembly, and a vehicle. Background Technology

[0002] In the reducer module of the coaxial electric drive assembly of new energy vehicles, the reducer input shaft bearing is a core component for transmitting power and ensuring transmission accuracy. The stability of its axial position directly affects the operational reliability of the entire electric drive system. To effectively limit the axial displacement of the bearing under high-speed rotation and variable load conditions, the outer ring of the input shaft bearing adopts a structural design in which the snap ring and the housing are coordinated for positioning, thereby achieving axial limitation of the bearing outer ring.

[0003] However, during actual assembly and operation, due to the limitations of machining precision of components such as bearings, snap rings, and bearing housings, there is an accumulation of dimensional tolerances in each component. This results in a clearance fit between the snap ring and the outer ring of the bearing, causing axial movement of the bearing when subjected to alternating loads or high-speed operation. This further induces abnormal noises in the outer ring of the bearing, affecting the driving experience and exacerbating abnormal wear of the bearing and surrounding components. Utility Model Content

[0004] This utility model provides an axial positioning structure for a reducer, an electric drive assembly, and a carrier to solve or improve the problem in related technologies where the outer ring of the input shaft bearing of a reducer is axially limited by a snap ring. Due to the accumulation of dimensional tolerances between various components, a clearance fit is formed between the snap ring and the outer ring of the bearing, resulting in axial movement of the bearing. This induces a series of abnormal noises from the outer ring of the bearing, affecting the driving experience and aggravating abnormal wear of the bearing and surrounding components.

[0005] Firstly, this utility model provides an axial positioning structure for a speed reducer, comprising: transmission shaft; A bearing is fitted onto one end of the drive shaft; A housing is fitted over the bearing, and the inner wall of the housing has a first stepped surface, with the outer ring of the bearing abutting against the first stepped surface; An annular locking member is sleeved on the drive shaft and abuts against the outer ring of the bearing. The outer wall of the annular locking member is provided with an external thread, and the inner wall of the housing is provided with an internal thread that matches the external thread.

[0006] In one alternative embodiment, the inner wall of the annular locking member has a polygonal structure, which is adapted to match the installation tool.

[0007] In one alternative embodiment, the inner wall of the annular locking member is provided with an oil guide groove, which is adapted to allow lubricating oil to flow to the bearing.

[0008] In one optional embodiment, there are multiple oil guide grooves, which are spaced apart circumferentially along the annular locking member.

[0009] In one alternative embodiment, the annular locking member has an annular transition portion at one end facing the bearing, the annular transition portion abutting against the outer ring of the bearing, and the outer diameter of the annular transition portion is smaller than the outer diameter of the external thread portion.

[0010] In one optional embodiment, the annular transition portion is an annular boss connected to the external thread portion, and the connection position between the annular transition portion and the external thread portion forms a stepped structure.

[0011] In one alternative implementation, it further includes: A retaining ring is sleeved on the drive shaft and abuts against the inner ring of the bearing. The outer wall of the drive shaft is provided with a second stepped surface, and the end of the inner ring of the bearing away from the retaining ring abuts against the second stepped surface.

[0012] In one alternative embodiment, the drive shaft is provided with an annular groove adapted to the retaining ring, and the retaining ring is fitted into the annular groove.

[0013] Secondly, this utility model also provides an electric drive assembly, including the reducer axial positioning structure as described in any of the above claims.

[0014] Thirdly, this utility model also provides a vehicle, including the electric drive assembly described above.

[0015] The axial positioning structure for the reducer provided by this utility model uses a screw-on annular locking component to directly abut against the outer ring of the bearing, thereby axially fixing the outer ring of the bearing. This replaces the traditional bearing outer ring retaining spring limiter, eliminates the fit clearance between the traditional retaining spring and the bearing outer ring, avoids axial movement of the bearing and abnormal noise from the bearing outer ring, improves the driving experience, and reduces abnormal wear of internal components of the reducer. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the axial positioning structure of the reducer according to an embodiment of the present utility model; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle; Figure 3 for Figure 2 A magnified view of a portion of point B in the middle; Figure 4 This is a schematic diagram of the structure of the annular locking member according to an embodiment of the present utility model; Figure 5 This is a partial structural schematic diagram of the transmission shaft according to an embodiment of the present utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Drive shaft; 101. Second stepped surface; 102. Annular groove; 103. Gear; 104. Weight reduction hole; 2. Bearing; 201. Outer ring; 202. Inner ring; 3. Housing; 301. First stepped surface; 302. Internal thread; 4. Annular locking element; 401. External thread; 402. Oil guide groove; 403. Annular transition part; 404. Stepped structure; 5. Snap ring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The following is combined Figures 1 to 5 This describes the reducer axial positioning structure, electric drive assembly, and carrier of embodiments of the present invention.

[0024] According to an embodiment of the present invention, in a first aspect, a reducer axial positioning structure is provided, suitable for application in the coaxial electric drive assembly of new energy vehicles. Specifically, as shown in the embodiment... Figure 1 As shown, the axial positioning structure of the reducer includes a drive shaft 1, a bearing 2, a housing 3, and an annular locking member 4. Specifically, the coaxial electric drive assembly includes a reducer and a motor. The input shaft of the reducer, i.e., the drive shaft 1, and the motor shaft are the same shaft, and the drive shaft 1 and the motor shaft are fixedly connected as a single shaft, thereby simplifying the structure of the electric drive assembly, improving transmission efficiency, and reducing design and manufacturing costs. Furthermore, the drive shaft 1 of the reducer integrates a gear 103, eliminating the need for traditional transition connecting parts between the gear and the drive shaft, such as bushings, significantly reducing the axial space occupied and radial profile dimensions on the input side. This makes the reducer input side structure more compact, effectively compressing the overall volume of the reducer, optimizing the internal power transmission path, and providing greater flexibility for the spatial layout design of the electric drive assembly. In addition, the drive shaft 1 has a weight-reduction hole 104, which aims to reduce the overall weight of the electric drive assembly, thus providing strong support for the lightweight design of the entire vehicle.

[0025] like Figure 1 As shown, bearing 2 is sleeved on one end of transmission shaft 1. Optionally, as follows: Figure 2As shown, the inner ring 202 of bearing 2 remains fixed to the drive shaft 1, while the outer ring 201 rotates relative to the inner ring 202. The housing 3 is fitted over the bearing 2, allowing relative rotation between the drive shaft 1 and the housing 3 via the bearing 2. The inner wall of the housing 3 has a first stepped surface 301, which abuts against the outer ring 201 of bearing 2. An annular locking member 4 is fitted onto the drive shaft 1, and abuts against the outer ring 201 of bearing 2. It can be understood that, as... Figure 2 and Figure 4 As shown, the annular locking member 4 is in direct contact with the outer ring 201 of the bearing 2, and its interior forms a clearance space that matches the inner ring 202 of the bearing 2. Specifically, as... Figure 2 and Figure 3 As shown, the outer wall of the annular locking member 4 is provided with an external thread portion 401, and the inner wall of the housing 3 is provided with an internal thread portion 302 that matches the external thread portion 401. That is to say, the annular locking member 4 is threadedly connected to the housing 3 and abuts against the outer ring 201 of the bearing 2 to preload the outer ring 201 of the bearing 2 axially.

[0026] With this configuration, by rotating the annular locking member 4, it can be tightly abutted against the outer ring 201 of the bearing 2, thereby achieving axial fixation of the outer ring 201 of the bearing 2. This structure replaces the traditional retaining ring limiting method for the bearing outer ring, effectively eliminating the fit clearance between the traditional retaining ring and the bearing outer ring, thus avoiding axial movement of the bearing and abnormal noise from the bearing outer ring. This not only improves the driving experience but also reduces abnormal wear of internal components of the reducer, extending the service life of the reducer.

[0027] Optionally, in some embodiments of this utility model, such as Figure 4 As shown, the inner wall of the annular locking component 4 has a polygonal structure, which is suitable for matching with installation tools. Specifically, the inner wall of the annular locking component 4 has a hexagonal structure, which can be matched with tools such as hexagonal wrenches. During installation or maintenance, the hexagonal wrench is inserted into the matching position of the inner hole of the annular locking component 4 to tighten or loosen it. It should be noted that the polygonal structure has a certain degree of versatility. Different types of installation tools (such as wrenches, sockets, etc.) can be designed according to their specifications to match the polygonal shape of the inner wall of the annular locking component 4. In this way, during installation and maintenance, a variety of common installation tools can be used to operate the annular locking component 4, improving the versatility and interchangeability of the tools, and reducing the cost of use and maintenance difficulty.

[0028] With this configuration, the installation tool can precisely fit into the polygonal inner wall of the annular locking member 4. During installation, the operator can quickly and accurately insert the installation tool into the annular locking member 4 to achieve precise positioning, ensuring that the installation tool can stably transmit torque, making the operation more reliable and safe, and greatly improving installation efficiency.

[0029] Optionally, in some embodiments of this utility model, such as Figure 4 As shown, the inner wall of the annular locking member 4 is provided with an oil guide groove 402, which is suitable for allowing lubricating oil to flow to the bearing 2. It should be noted that when the reducer is in high-speed operation, the gear 103 at the end of the transmission shaft 1 will effectively agitate the internal lubricating oil, thereby causing the lubricating oil to splash and flow onto the annular locking member 4. Subsequently, the lubricating oil can flow smoothly along the oil guide groove 402 on the annular locking member 4, and finally be precisely guided to the lubrication part of the bearing 2. Specifically, the oil guide groove 402 can be designed as an arc-shaped groove. The arc-shaped groove has a smooth curve profile, which can provide a smoother flow path for the lubricating oil. When the lubricating oil flows in the arc-shaped groove, it experiences less resistance and can flow to the bearing 2 more quickly and evenly.

[0030] With this design, the oil guide groove 402 provides a clear flow path for the lubricating oil, guiding it accurately to the key friction parts of the bearing 2. This allows the lubricating oil to reach the areas requiring lubrication more directly and effectively, improving the efficiency of lubricating oil use, reducing direct contact and wear between the various components of the bearing 2, and extending the service life of the bearing 2. Even under harsh conditions such as long-term operation or high-speed and heavy-load conditions, the bearing 2 can be ensured to receive sufficient lubrication, improving its lubrication performance and extending its service life.

[0031] Optionally, in some embodiments of this utility model, such as Figure 4 As shown, there are multiple oil guide grooves 402, which are spaced apart circumferentially along the annular locking member 4. It should be noted that the number of oil guide grooves 402 can be determined according to actual design requirements. This arrangement, with multiple oil guide grooves 402 evenly spaced circumferentially, guides lubricating oil to the bearing 2 from different positions. This allows the lubricating oil to more comprehensively and evenly cover all parts of the bearing 2, ensuring sufficient lubrication and reducing localized dry friction caused by poor lubricating oil flow. This, in turn, reduces wear on the bearing 2 and extends its service life.

[0032] Understandably, multiple oil guide grooves 402 effectively increase the number of lubricating oil delivery channels, enabling the simultaneous delivery of more lubricating oil to the bearing 2. Under conditions of high-speed operation or heavy load, this multi-channel lubrication method can replenish lubricating oil to the bearing 2 more quickly, meeting its high-intensity lubrication requirements and ensuring that the bearing 2 is always in a good lubrication condition. Furthermore, it enhances lubrication reliability; even if one oil guide groove 402 becomes blocked or damaged, the others can still function normally, continuing to supply lubricating oil to the bearing 2. This redundant design improves the reliability of the lubrication system and reduces the risk of equipment damage due to lubrication failure.

[0033] Optionally, in some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the annular locking member 4 has an annular transition portion 403 at one end facing the bearing 2. The annular transition portion 403 abuts against the outer ring 201 of the bearing 2, and the outer diameter of the annular transition portion 403 is smaller than the outer diameter of the external thread portion 401. Specifically, as shown... Figure 3 and Figure 4 As shown, the annular transition portion 403 is an annular boss connected to the external thread portion 401, and the connection position between the annular transition portion 403 and the external thread portion 401 forms a stepped structure 404. This stepped structure 404 allows the end of the annular locking member 4 to form a threaded connection clearance section during installation.

[0034] This design, through the arrangement of the annular transition section 403, effectively eliminates potential clearance errors in the threaded connection pair, thereby ensuring a reliable and tight fit between the annular locking member 4 and the outer ring 201 of the bearing 2. This effectively suppresses axial movement of the bearing 2 and prevents abnormal noise from the outer ring 201 of the bearing 2 during operation. Furthermore, this structure provides the necessary axial fixing allowance for the tightening operation of the annular locking member 4, allowing for flexible adjustment of the axial preload of the bearing 2 by precisely controlling the tightening torque of the annular locking member 4 according to actual design requirements.

[0035] Optionally, in some embodiments of this utility model, see Figure 1 and Figure 2 As shown, the axial positioning structure of the reducer also includes a retaining ring 5, which is sleeved on the drive shaft 1 and abuts against the inner ring 202 of the bearing 2. It should be noted that the specifications and type of the retaining ring 5 can be selected and installed according to different drive shaft 1 diameters, bearing 2 dimensions, and operating conditions. Thus, by abutting against the inner ring 202 of the bearing 2, the retaining ring 5 provides a clear and reliable axial positioning of the inner ring 202 of the bearing 2 on the drive shaft 1. During the operation of the drive shaft 1, the bearing 2 will be subjected to various axial forces, such as axial loads and axial displacement caused by thermal expansion. The retaining ring 5 can effectively prevent unnecessary axial displacement of the inner ring 202 of the bearing 2 under the action of these axial forces, ensuring that the bearing 2 is always in the correct installation position and guaranteeing the normal operation of the transmission system.

[0036] Optionally, such as Figure 2 and Figure 5As shown, the outer wall of the drive shaft 1 is provided with a second stepped surface 101, and the end of the inner ring 202 of the bearing 2 away from the retaining ring 5 abuts against the second stepped surface 101. In this way, the second stepped surface 101 further provides a clear and fixed axial stop position for the inner ring 202 of the bearing 2. Thus, the second stepped surface 101 and the retaining ring 5 work together to constrain the inner ring 202 of the bearing 2 from both ends, ensuring that the axial position of the bearing 2 on the drive shaft 1 remains fixed. This greatly improves the reliability of the axial positioning of the inner ring 202 of the bearing 2. Even if the retaining ring 5 becomes loose or damaged due to long-term use, the second stepped surface 101 can still play a certain axial positioning role, avoiding the bearing 2 from losing axial constraint instantly and causing equipment failure. This provides double protection for the safe operation of the equipment and ensures the stable operation of the transmission system.

[0037] Optionally, in some embodiments of this utility model, see Figure 2 and Figure 5 As shown, the drive shaft 1 has an annular groove 102 that matches the snap ring 5, and the snap ring 5 is embedded in the annular groove 102. This arrangement provides a precise mounting position for the snap ring 5, allowing it to be securely embedded. During the operation of the drive shaft 1, the snap ring 5 and the annular groove 102 closely cooperate, effectively limiting the axial movement of components such as the bearing 2, ensuring they are always in the correct position, and preventing equipment malfunctions caused by axial movement, such as increased vibration and accelerated wear. Furthermore, the sidewall of the annular groove 102 acts as a barrier for the snap ring 5, preventing it from falling off the shaft when the drive shaft 1 rotates at high speed or is subjected to axial impact, ensuring the stability of axial positioning and improving the safety and reliability of equipment operation.

[0038] According to an embodiment of the present invention, in a second aspect, an electric drive assembly is also provided, including a reducer axial positioning structure as described in the various embodiments above. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the reducer axial positioning structure described above, and therefore will not be repeated here.

[0039] According to an embodiment of the present invention, in a third aspect, a vehicle is also provided, including the electric drive assembly as described in the above embodiments. Optionally, the vehicle is a vehicle, a low-altitude aircraft, etc. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the electric drive assembly described above, and therefore will not be repeated here.

[0040] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An axial positioning structure for a speed reducer, characterized in that, include: Drive shaft (1); Bearing (2) is sleeved on one end of the drive shaft (1); A housing (3) is fitted over the bearing (2). The inner wall of the housing (3) is provided with a first stepped surface (301). The outer ring (201) of the bearing (2) abuts against the first stepped surface (301). The annular locking member (4) is sleeved on the transmission shaft (1) and abuts against the outer ring (201) of the bearing (2). The outer wall of the annular locking member (4) is provided with an external thread (401), and the inner wall of the housing (3) is provided with an internal thread (302) that is adapted to the external thread (401).

2. The reducer axial positioning structure according to claim 1, characterized in that, The inner wall of the annular locking member (4) is a polygonal structure, which is matched with the installation tool.

3. The axial positioning structure for the reducer according to claim 1 or 2, characterized in that, The inner wall of the annular locking member (4) is provided with an oil guide groove (402), which provides lubricating oil to flow to the bearing (2).

4. The reducer axial positioning structure according to claim 3, characterized in that, The number of oil guide grooves (402) is multiple, and the multiple oil guide grooves (402) are arranged at intervals along the circumference of the annular locking member (4).

5. The reducer axial positioning structure according to claim 1 or 2, characterized in that, The annular locking member (4) has an annular transition portion (403) at one end facing the bearing (2). The annular transition portion (403) abuts against the outer ring (201) of the bearing (2), and the outer diameter of the annular transition portion (403) is smaller than the outer diameter of the external thread portion (401).

6. The reducer axial positioning structure according to claim 5, characterized in that, The annular transition portion (403) is an annular boss connected to the external thread portion (401), and the connection position between the annular transition portion (403) and the external thread portion (401) forms a stepped structure (404).

7. The reducer axial positioning structure according to claim 1 or 2, characterized in that, Also includes: A snap ring (5) is sleeved on the drive shaft (1) and abuts against the inner ring (202) of the bearing (2). The outer wall of the drive shaft (1) is provided with a second stepped surface (101). The end of the inner ring (202) of the bearing (2) away from the snap ring (5) abuts against the second stepped surface (101).

8. The reducer axial positioning structure according to claim 7, characterized in that, The drive shaft (1) is provided with an annular groove (102) that is adapted to the snap ring (5), and the snap ring (5) is embedded in the annular groove (102).

9. An electric drive assembly, characterized in that, Includes the reducer axial positioning structure as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Includes the electric drive assembly as described in claim 9.

Images