Spline sleeve set for an electric machine and electric machine

Abstract

The utility model provides a kind of spline sleeve group for motor and motor, it is related to motor for vehicle technical field, and the output shaft of motor has first outer spline.The spline sleeve group includes compensation shaft, reset member and auxiliary assembly ring.Compensation shaft is coaxially arranged with output shaft and has second outer spline.Reset member is connected between output shaft and compensation shaft, and second outer spline has the tendency of being staggered with preset angle in circumferential direction relative to first outer spline by applying circumferential force to compensation shaft, to eliminate the tooth side clearance between output shaft and driving target.Auxiliary assembly ring is slidably sleeved in the junction of compensation shaft and output shaft, to overcome the circumferential force of reset member and make first outer spline and second outer spline align in circumferential direction.Auxiliary assembly ring is coaxially inserted with driving target, and in response to its second inner spline sequentially engages with second outer spline and first outer spline in axial direction, maintains the circumferential relative position of driving target and output shaft.

Description

Technical Field

[0001] This utility model relates to the field of motor technology for vehicles, and more specifically, to a spline assembly for a motor. Background Technology

[0002] The drive motor is a core component of the powertrain of new energy vehicles. Its main function is to convert electrical energy provided by the vehicle battery into mechanical energy to drive the wheels, or to recover kinetic energy from the vehicle and supply power to the battery. In the overall vehicle powertrain system, the motor is usually integrated with the reducer or gearbox into an electric drive assembly, transmitting power to the wheels via half-shafts. In terms of structural connection, the motor's output shaft transmits torque to the reducer's input shaft via splines or couplings. Among various noise sources in an engine, mechanical noise is a significant component, primarily generated by friction and meshing collisions of moving parts within the engine. Spline structures are widely used in power transmission scenarios such as crankshaft and generator, crankshaft and gearbox, and camshaft drive systems.

[0003] Typically, a clearance fit is required between splines and spline sleeves to meet assembly and thermal expansion / contraction compensation needs. However, during variable operating conditions, especially in high-response transmission systems with frequent start-stop and reversal switching, the key teeth and keyway sidewalls are prone to meshing impacts at the moment of contact, resulting in frequent rigid collisions. This not only generates significant meshing impact noise but also exacerbates impact wear, pitting, and fatigue damage on the tooth surface. In severe cases, it can reduce the accuracy of spline transmission and significantly shorten the service life of the spline. Common optimization approaches include: reducing impact energy by optimizing the distribution range of tooth clearance; introducing wear-resistant polymer coatings or elastic non-metallic materials into the spline pair to buffer the rigid collisions at the moment of contact; and using special tooth profile modifications to make the meshing process more gradual and smooth. However, these approaches cannot fundamentally eliminate clearances, nor can they solve the problems of clearance expansion due to wear and temperature fluctuations caused by long-term use of splines. They also cannot completely eliminate meshing collisions and noise problems.

[0004] In related technologies, there exists a split-type spline shaft capable of eliminating mating clearances, such as the one disclosed in invention patent CN119765766A. This split-type spline shaft has a spring-connected main shaft and a secondary shaft. After being installed into a spline sleeve, the main shaft and secondary shaft rotate relative to each other at a certain angle under the action of elastic force, causing the key teeth of the main shaft and secondary shaft to abut against the side walls of the keyway of the spline sleeve. However, in practical applications, the main shaft of this split-type spline shaft generally extends from the power unit (e.g., a motor), while the spline sleeve is not an independent component. It is often integrated with a larger drive target (reducer, drive shaft, etc.), making it difficult to assemble the power unit and drive target together overcoming the elastic force. Therefore, further design improvements to the split-type spline shaft are urgently needed to solve the assembly difficulties in practical applications. Utility Model Content

[0005] In view of this, the present invention provides a spline sleeve for a motor, which continuously locks the circumferential relative position of the compensation shaft and the output shaft by means of an auxiliary assembly ring, thereby simplifying the assembly process of the drive target to the output shaft and reducing the assembly difficulty.

[0006] One aspect of this utility model provides a splined assembly for a motor, the motor having an output shaft having a first external spline extending in an axial direction, wherein the splined assembly includes: a compensating shaft, coaxially disposed with the output shaft and having a second external spline extending in an axial direction; and a resetting member, connected between the output shaft and the compensating shaft, configured to apply a circumferential force to the compensating shaft, causing the second external spline to tend to be offset from the first external spline by a predetermined angle in the circumferential direction, so as to achieve a resetting effect between the output shaft and the compensating shaft. After assembly to the drive target, the tooth backlash between the output shaft and the drive target is eliminated; an auxiliary assembly ring, having a first internal spline, is slidably fitted at the connection between the compensation shaft and the output shaft to overcome the circumferential force of the reset member and align the first external spline and the second external spline in the circumferential direction; the auxiliary assembly ring is configured to coaxially engage with the drive target so that, in response to the second internal spline of the drive target sequentially meshing with the second external spline and the first external spline in the axial direction, the circumferential relative position of the drive target and the output shaft is maintained.

[0007] According to an embodiment of the present invention, the auxiliary assembly ring has a first state in which the first internal spline engages simultaneously with the first external spline and the second external spline to lock the circumferential position of the compensation shaft, and a second state in which it is pushed along the axial direction by the driving target to disengage from the compensation shaft to release the locking of the circumferential position of the compensation shaft.

[0008] According to an embodiment of the present invention, a mounting portion is provided on the facing end faces of the output shaft and the compensation shaft, and the two ends of the reset member are respectively connected to the two mounting portions, so that the reset member uses elastic force to drive the compensation shaft to rotate relative to the output shaft.

[0009] According to an embodiment of the present invention, each of the above-mentioned mounting parts includes: a pin, which is connected to the end of the above-mentioned reset member; and a pin hole, which is formed on the end face of the above-mentioned output shaft or the above-mentioned compensation shaft and is suitable for mounting the above-mentioned pin.

[0010] According to an embodiment of the present invention, the reset component includes any one of a spring clip, a torsion spring, a wave spring, or an elastic rubber block.

[0011] According to an embodiment of the present invention, an axially protruding mounting flange is formed on the end face of the output shaft, and an axially recessed mounting groove that mates with the mounting flange is formed on the end face of the output shaft.

[0012] According to an embodiment of the present invention, a tool engagement portion is formed on the end face of the compensation shaft opposite to the output shaft, which is suitable for an assembly tool to apply force to the compensation shaft, so that the compensation shaft rotates until the second external spline is aligned with the first external spline in the circumferential direction.

[0013] According to an embodiment of the present invention, the tool engagement portion is configured as a hexagonal prism structure in which the end face of the compensation shaft extends away from the output shaft.

[0014] Another aspect of this utility model provides an electric motor, comprising: a housing; a stator installed inside the housing and adapted to generate a rotating magnetic field; a rotor rotatably installed in the housing and adapted to rotate in the presence of an energized state in response to the rotating magnetic field, the rotor having an output shaft for outputting torque; and a splined sleeve for the motor as in any of the above embodiments, one end of which is connected to the output shaft and the other end of which is used to assemble a drive target to eliminate tooth backlash between the output shaft and the drive target.

[0015] The spline assembly for a motor provided by this utility model involves pre-assembling the output shaft, reset component, and compensating shaft. First, a circumferential force is applied to the compensating shaft to overcome the circumferential force of the reset component, causing the compensating shaft to rotate until the second external spline aligns with the first external spline. Then, an auxiliary assembly ring is installed axially at the connection between the output shaft and the compensating shaft, ensuring that the first and second external splines remain approximately aligned even after the circumferential force is removed. Next, the drive target is installed onto the compensating shaft and continuously slid axially until it engages with the output shaft. During this process, after the auxiliary assembly ring disengages from the compensating shaft, the compensating shaft can rotate a preset angle within the drive target to eliminate tooth backlash. In this way, the output shaft and motor can be directly clamped and fixed, and the drive target can be driven by a linear motion mechanism to complete the assembly. No continuous force is required on the compensating shaft during the process, and the auxiliary assembly ring does not need to be removed after assembly, reducing the difficulty of the assembly task and minimizing operational risks for workers. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 This is a perspective structural diagram of a spline sleeve for an electric motor provided by an exemplary embodiment of the present invention;

[0018] Figure 2 This is an exploded structural diagram of a spline sleeve assembly for an electric motor provided by an exemplary embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the principle of a spline sleeve for an electric motor provided by an exemplary embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of a spline sleeve assembly for an electric motor provided by an exemplary embodiment of the present invention;

[0021] Figure 5 This is an exploded view of the spline sleeve for an electric motor provided by an exemplary embodiment of the present invention from another angle.

[0022] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0023] 1. Output shaft;

[0024] 11. First external spline;

[0025] 12. Install the flange;

[0026] 2. Compensation shaft;

[0027] 21. Second external spline;

[0028] 22. Mounting slot;

[0029] 23. Tool joint;

[0030] 3. Reset component;

[0031] 4. Auxiliary assembly ring;

[0032] 41. First internal spline;

[0033] 42. Connector block;

[0034] 5. Driving objectives;

[0035] 51. Second internal spline;

[0036] 52. Connecting slot;

[0037] 6. Installation Department;

[0038] 61. Pin;

[0039] 62. Pin hole. Detailed Implementation

[0040] The embodiments of the present invention will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, numerous specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the present invention.

[0041] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0042] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0043] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0044] Figure 1 This is a perspective structural diagram of a spline sleeve for an electric motor provided by an exemplary embodiment of the present invention. Figure 2 This is an exploded structural diagram of a spline sleeve for an electric motor provided by an exemplary embodiment of the present invention.

[0045] An embodiment of this utility model provides a spline sleeve for an electric motor, such as... Figure 1 and Figure 2As shown, the motor has an output shaft 1 with a first external spline 11 extending axially. The spline assembly includes a compensating shaft 2, a reset member 3, and an auxiliary assembly ring 4. The compensating shaft 2 is coaxially arranged with the output shaft 1 and has a second external spline 21 extending axially. The reset member 3 is connected between the output shaft 1 and the compensating shaft 2 and is configured to apply a circumferential force to the compensating shaft 2, causing the second external spline 21 to tend to be offset from the first external spline 11 by a predetermined angle in the circumferential direction, so as to eliminate the tooth backlash between the output shaft 1 and the driving target 5 after the output shaft 1 and the compensating shaft 2 are assembled to the driving target 5. The auxiliary assembly ring 4 has a first internal spline 41 and is slidably fitted at the connection between the compensating shaft 2 and the output shaft 1 to overcome the circumferential force of the reset member 3 and align the first external spline 11 and the second external spline 21 in the circumferential direction. The auxiliary assembly ring 4 is configured to coaxially engage with the drive target 5, so as to maintain the circumferential relative position of the drive target 5 and the output shaft 1 in response to the second internal spline 51 of the drive target 5 sequentially engaging with the second external spline 21 and the first external spline 11 in the axial direction.

[0046] like Figure 1 and Figure 2 As shown, the output shaft 1 is connected to the compensation shaft 2 via the reset component 3. In its natural state (i.e., without external interference), the first external spline 11 of the output shaft 1 and the second external spline 21 of the compensation shaft 2 are offset in the circumferential direction. The first internal spline 41 of the auxiliary assembly ring 4 has an interference fit or a transition fit with the first external spline 11 and the second external spline 21. The second internal spline 51 of the driving target 5 has a clearance fit with the first external spline 11 and the second external spline 21.

[0047] During assembly, the output shaft 1, reset component 3, and compensation shaft 2 are pre-assembled. First, a circumferential force is applied to the compensation shaft 2 to overcome the circumferential force of the reset component 3, causing the compensation shaft 2 to rotate until the second external spline 21 is aligned with the first external spline 11. Then, the auxiliary assembly ring 4 is installed axially at the connection between the output shaft 1 and the compensation shaft 2, so that the first external spline 11 and the second external spline 21 remain approximately aligned even after the circumferential force is removed.

[0048] It should be noted that the first internal spline 41 and the first external spline 11 and the second external spline 21 adopt a transition fit. After the auxiliary assembly ring 4 is installed, there will still be a slight circumferential misalignment between the first external spline 11 and the second external spline 21, but it will not affect the subsequent assembly of the drive target. Moreover, compared with the interference fit, it can significantly reduce the assembly difficulty of the auxiliary assembly ring 4.

[0049] Subsequently, the drive target 5 is first installed onto the compensation shaft 2, and the drive target 5 is then engaged with the auxiliary assembly ring 4 to lock its circumferential relative position. The drive target 5 is then pushed axially until it engages with the output shaft 1. During this process, because the circumferential relative positions of the output shaft 1, the auxiliary assembly ring 4, and the drive target 5 remain fixed, even if the compensation shaft 2 rotates under the action of the reset member 3, its rotation range is limited to the range of the mating clearance with the drive target 5, i.e., the rotation angle used to eliminate tooth backlash. Furthermore, since the drive target 5 is already engaged with the compensation shaft 2 when the rotation occurs, it will not lead to assembly failure or increased assembly difficulty. Under the constraint of the auxiliary assembly ring 4, the drive target 5 can smoothly continue to engage with the output shaft 1.

[0050] In this implementation, during assembly, the output shaft 1, along with the motor, can be directly clamped and fixed. The drive target 5 is driven by a linear motion mechanism to complete the assembly action. There is no need to continuously apply force to the compensation shaft 2 during the process; as the drive target 5 advances, the compensation shaft 2 rotates to form a compensation angle. After assembly, the auxiliary assembly ring 4 does not need to be removed, reducing the difficulty of the assembly task and minimizing the risks to workers.

[0051] When the motor drives the target 5 to rotate, the output shaft 1 and the compensation shaft 2 can simultaneously abut against the target 5. Taking forward and reverse rotation as an example, during forward rotation, the output shaft 1 mainly drives the target 5, while the compensation shaft 2 is driven by the reset component 3 and / or the target 5. After switching to reverse rotation, the compensation shaft 2 mainly drives the target 5. At this time, the torque of the output shaft 1 is transmitted to the compensation shaft 2 through the reset component 3. Since the output shaft 1 and the compensation shaft 2 are offset by a preset angle, the output shaft 1 will not have a rigid collision with the target 5. Based on the above, those skilled in the art can understand the principle of eliminating tooth backlash by offsetting the compensation shaft 2 and the output shaft 1 by a preset angle, which will not be elaborated further here.

[0052] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, the auxiliary assembly ring 4 has a first state in which the first inner spline 41 engages simultaneously with the first outer spline 11 and the second outer spline 21 to lock the circumferential position of the compensation shaft 2, and a second state in which the driven target 5 is pushed in the axial direction to disengage from the compensation shaft 2 to release the lock on the circumferential position of the compensation shaft 2.

[0053] In this implementation, the auxiliary assembly ring 4 has two states. Before assembling the drive target 5, the auxiliary assembly ring 4 is in the first state, where the first internal spline 41 spans the joint between the output shaft 1 and the compensation shaft 2, and simultaneously engages with the first external spline 11 and the second external spline 21, thereby locking the circumferential position of the compensation shaft 2 and preventing it from shifting under the action of the reset member 3. After the drive target 5 is assembled in place, the auxiliary assembly ring 4 switches to the second state. As the drive target 5 continues to penetrate axially, its end face directly pushes against the auxiliary assembly ring 4 axially, causing it to slide towards the center of the output shaft 1 until it completely disengages from the second external spline 21 of the compensation shaft 2. At this point, the auxiliary assembly ring 4 releases its circumferential locking of the compensation shaft 2, and the elastic force of the reset member 3 is released.

[0054] More specifically, when the joint between the output shaft 1 and the compensation shaft 2 coincides with the joint between the auxiliary assembly ring 4 and the drive target 5, the compensation shaft 2 will rotate circumferentially to form a compensation angle offset from the output shaft 1. As mentioned above, at this time, the second external spline 21 is already engaged with the second internal spline 51, and the circumferential relative positions of the output shaft 1, the auxiliary assembly ring 4, and the drive target 5 remain locked. The circumferential rotation of the compensation shaft 2 will not affect the drive target 5 from crossing the joint between the output shaft 1 and the compensation shaft 2, thereby forming a fit with the output shaft 1. After this, the auxiliary assembly ring 4 retracts to engage only with the output shaft 1. Through reasonable design of its size and shape, it can be allowed to rotate synchronously with the output shaft 1 without interfering with the normal operation of the motor.

[0055] Figure 3 This is a schematic diagram of the principle of a spline sleeve for an electric motor provided by an exemplary embodiment of the present invention. Figure 4 This is a cross-sectional view of a spline sleeve for an electric motor provided by an exemplary embodiment of the present invention.

[0056] In one exemplary embodiment, such as Figure 3 and Figure 4 As shown, an insertion block 42 is formed on the auxiliary assembly ring, and an insertion groove 52 is formed on the drive target 5 to engage with the insertion block 42. When the two seams in the above embodiment coincide, the engagement of the insertion block 42 and the insertion groove 52 fixes the circumferential relative position of the output shaft 1, the auxiliary assembly ring 4, and the drive target 5, and will not be affected by the compensation shaft 2.

[0057] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, mounting portions 6 are provided on the facing end faces of the output shaft 1 and the compensation shaft 2. The two ends of the reset member 3 are respectively connected to the two mounting portions 6, so that the reset member 3 uses elastic force to drive the compensation shaft 2 to rotate relative to the output shaft 1.

[0058] According to embodiments of the present invention, such as Figure 2As shown, each mounting part 6 includes a pin 61 and a pin hole 62. The pin 61 is connected to the end of the reset member 3. The pin hole 62 is formed on the end face of the output shaft 1 or the compensation shaft 2, and is suitable for mounting the pin 61.

[0059] In this implementation, to achieve stable output of circumferential force, mounting portions 6 are provided on the facing end faces of the output shaft 1 and the compensation shaft 2, and the two ends of the reset member 3 are respectively connected to these two mounting portions 6. Specifically, each mounting portion 6 includes a pin 61 and a pin hole 62. Pin holes 62 are machined on the end faces of the output shaft 1 and the compensation shaft 2, and the pin 61 is pressed into the pin hole 62 for fixation by an interference fit. The two ends of the reset member 3 are respectively engaged or pressed against the corresponding pin 61. This allows the elastic force of the reset member 3 to be converted into a torque arm acting on the output shaft 1 and the compensation shaft 2. At the same time, the interference fit structure of the pin 61 and the pin hole 62 is simple and compact, which not only has low manufacturing cost, but also can withstand the fatigue stress caused by the frequent movement of the reset member 3, ensuring long-term reliability under complex engine operating conditions.

[0060] In one exemplary embodiment, the reset element 3 includes any one of a spring clip, a torsion spring, a wave spring, or an elastic rubber block.

[0061] like Figure 2 As shown, the reset element 3 is preferably an arc-shaped spring clip. However, in other embodiments, depending on the limitations of the radial and axial space inside the motor, the reset element 3 can also be replaced by any one of a torsion spring, a wave spring, or an elastic rubber block. For example, if a torsion spring is used, it can be sleeved in the gap between the output shaft 1 and the compensation shaft 2, with the two legs of the torsion spring fixed to the two mounting parts 6 respectively.

[0062] Figure 5 This is an exploded view of the spline sleeve for an electric motor provided by an exemplary embodiment of the present invention from another angle.

[0063] According to embodiments of the present invention, such as Figure 1 , Figure 2 and Figure 5 As shown, an axially protruding mounting flange 12 is formed on the end face of the output shaft 1, and an axially recessed mounting groove 22 that mates with the mounting flange 12 is formed on the end face of the compensation shaft 2 facing the output shaft 1.

[0064] In this implementation, to prevent radial runout of the compensating shaft 2, an axially protruding mounting flange 12 is formed on the end face of the output shaft 1, while an axially recessed mounting groove 22 is formed on the end face of the compensating shaft 2 facing the output shaft 1. During assembly, the mounting flange 12 is inserted into the mounting groove 22 to form a shaft-hole fit. It is worth noting that a clearance is left between the mounting flange 12 and the mounting groove 22 to allow relative circumferential rotation between the two. Without interfering with the circumferential rotation of the compensating shaft 2 to eliminate backlash, the coaxiality of the output shaft 1 and the compensating shaft 2 is improved, avoiding uneven force on the tooth surface caused by misalignment, further reducing transmission noise, and extending the service life of the spline tooth surface.

[0065] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, the end face of the compensation shaft 2 facing away from the output shaft 1 has a tool engagement portion 23, which is suitable for the assembly tool to apply force to the compensation shaft 2, so that the compensation shaft 2 rotates until the second external spline 21 is aligned with the first external spline 11 in the circumferential direction.

[0066] According to an embodiment of the present invention, the tool engagement portion 23 is configured as a hexagonal prism structure extending from the end face of the compensation shaft 2 away from the output shaft 1.

[0067] In this embodiment, a tool engagement portion 23 is formed on the outermost end face of the compensation shaft 2 opposite to the output shaft 1. Furthermore, this tool engagement portion 23 is configured as an outwardly extending hexagonal prism structure, i.e., an external hexagonal structure. During assembly, the operator uses a standard open-end wrench or hex socket to engage this hexagonal prism structure, applying circumferential torque to rotate and align the compensation shaft 2. Then, the auxiliary assembly ring 4 can be easily pushed in with the other hand. Subsequently, during the installation of the drive target 5, there is no need for the operator to readjust the compensation shaft 2.

[0068] The hexagonal prism structure is a mature and universally used force application interface in the mechanical field. Workers can complete the compression of the reset component 3 and the alignment of the compensation shaft 2 in a short time using only conventional hand tools, reducing the difficulty of operation and assembly time.

[0069] An exemplary embodiment of this utility model also provides an electric motor, including a housing, a stator, a rotor, and a splined sleeve assembly for the motor as described in any of the above embodiments. The stator is mounted inside the housing and is adapted to generate a rotating magnetic field. The rotor is rotatably mounted in the housing and is adapted to rotate in response to the rotating magnetic field when energized. The rotor has an output shaft 1 for outputting torque. One end of the splined sleeve assembly for the motor is connected to the output shaft 1, and the other end is used to assemble a drive target 5 to eliminate backlash between the output shaft 1 and the drive target 5.

[0070] In this implementation, the rotor's output shaft 1 serves as the basic carrier of the spline sleeve assembly, and the compensation shaft 2 is connected to the end of the output shaft 1 via a reset component 3. When the motor is powered on, the rotor's rotational power is transmitted seamlessly to the drive target 5, such as the reducer input shaft or load flange, through the output shaft 1 and the compensation shaft 2. Integrating this spline sleeve assembly into the motor rotor output end eliminates the mechanical noise source of "tooth backlash" from the power source. For new energy vehicle drive motors or high-precision servo motors, this solves the knocking noise generated during low-speed creeping, rapid acceleration, deceleration, and reversing, improving the overall NVH quality of the vehicle and the transmission accuracy of the motor.

[0071] Those skilled in the art will understand that the features described in the various embodiments of this utility model can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this utility model. In particular, the features described in the various embodiments of this utility model can be combined and / or combined in various ways without departing from the spirit and teachings of this utility model. All such combinations and / or combinations fall within the scope of this utility model.

[0072] The embodiments of this utility model have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of this utility model. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Without departing from the scope of this utility model, those skilled in the art can make various substitutions and modifications, all of which should fall within the scope of this utility model.

Claims

1. A splined assembly for an electric motor, the motor having an output shaft having a first external spline extending in an axial direction, characterized in that, The spline assembly includes: The compensation shaft is coaxially arranged with the output shaft and has a second external spline extending in the axial direction; A reset component, connected between the output shaft and the compensation shaft, is configured to apply a circumferential force to the compensation shaft, causing the second external spline to tend to be offset from the first external spline by a predetermined angle in the circumferential direction, so as to eliminate the tooth backlash between the output shaft and the drive target after the output shaft and the compensation shaft are assembled to the drive target. An auxiliary assembly ring, having a first internal spline, is slidably fitted onto the connection between the compensation shaft and the output shaft to overcome the circumferential force of the reset member and align the first external spline and the second external spline in the circumferential direction. The auxiliary assembly ring is configured to coaxially engage with the drive target, so as to respond to the second internal spline of the drive target engaging sequentially with the second external spline and the first external spline in the axial direction, thereby maintaining the circumferential relative position of the drive target and the output shaft.

2. The spline sleeve for an electric motor according to claim 1, characterized in that, The auxiliary assembly ring has a first state in which the first internal spline engages simultaneously with the first external spline and the second external spline to lock the circumferential position of the compensation shaft, and a second state in which it is pushed axially by the driving target to disengage from the compensation shaft to release the locking of the circumferential position of the compensation shaft.

3. The spline sleeve for an electric motor according to claim 1 or 2, characterized in that, The output shaft and the compensation shaft are each provided with a mounting part on their facing end faces. The two ends of the reset member are respectively connected to the two mounting parts, so that the reset member uses elastic force to drive the compensation shaft to rotate relative to the output shaft.

4. The spline sleeve for an electric motor according to claim 3, characterized in that, Each of the aforementioned mounting parts includes: A pin is connected to the end of the reset component; A pin hole is formed on the end face of the output shaft or the compensation shaft, which is suitable for mounting the pin.

5. The spline sleeve for an electric motor according to claim 1 or 2, characterized in that, The reset component includes any one of a spring clip, a torsion spring, a wave spring, or an elastic rubber block.

6. The spline sleeve for an electric motor according to claim 5, characterized in that, An axially protruding mounting flange is formed on the end face of the output shaft, and an axially recessed mounting groove that mates with the mounting flange is formed on the end face of the compensation shaft.

7. The spline sleeve for an electric motor according to claim 1 or 2, characterized in that, The end face of the compensation shaft opposite to the output shaft has a tool engagement portion, which is suitable for an assembly tool to apply force to the compensation shaft, so that the compensation shaft rotates until the second external spline is aligned with the first external spline in the circumferential direction.

8. The spline sleeve for an electric motor according to claim 7, characterized in that, The tool engagement is configured as a hexagonal prism structure in which the compensation shaft extends from the end face opposite to the output shaft.

9. An electric motor, characterized in that, include: case; The stator, installed inside the housing, is suitable for generating a rotating magnetic field; The rotor is rotatably mounted on the housing and is adapted to rotate under the action of a rotating magnetic field when energized. The rotor has an output shaft for outputting torque to the outside. The splined sleeve for a motor as described in any one of claims 1-8, one end of which is connected to the output shaft, and the other end is used to assemble a drive target to eliminate tooth backlash between the output shaft and the drive target.

Images