Electric motors and vehicles

Abstract

This utility model provides an electric motor and a vehicle. The electric motor includes: a stator; a rotor; and a shaft assembly connected to the rotor. The rotor drives the shaft assembly to rotate relative to the stator. The shaft assembly is used to mount a transmission component and drives the transmission component to rotate. The shaft assembly includes: a sleeve; and a shaft body, a portion of which extends into and is welded to the sleeve. The shaft body has a hollow structure. The sleeve has a first limiting portion, and the shaft body has a second limiting portion. The first and second limiting portions are adapted to each other, and the shaft body is connected to the sleeve through the cooperation of the first and second limiting portions, so that the portion of the shaft body extending into the sleeve can be retained within the sleeve. By limiting the sleeve and shaft body through the cooperation of the first and second limiting portions, separation of the shaft body from the sleeve can be prevented in the event of welding failure between the sleeve and the shaft body, thus improving the reliability and safety of the electric motor.

Description

Technical Field

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

[0002] In related technologies, the hollow shaft of the motor includes a shaft body and a sleeve. The shaft body and the sleeve are connected as one piece by welding. However, there is no other anti-detachment structure between the two. When the welding fails, the sleeve and the shaft body are easily separated. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the first objective of this utility model is to provide an electric motor.

[0005] The second objective of this utility model is to provide a vehicle.

[0006] To achieve at least one of the above objectives, according to a first aspect of the present invention, an electric motor is provided. The motor is capable of connecting to a transmission component. The motor includes: a stator; a rotor; and a shaft assembly connected to the rotor. The rotor drives the shaft assembly to rotate relative to the stator. The shaft assembly is used to mount the transmission component and drives the transmission component to rotate. The shaft assembly includes: a sleeve; and a shaft body. A portion of the shaft body extends into the sleeve and is welded to the sleeve. The shaft body has a hollow structure. The sleeve has a first limiting portion, and the shaft body has a second limiting portion. The first limiting portion and the second limiting portion are adapted to each other. The shaft body is connected to the sleeve through the cooperation of the first limiting portion and the second limiting portion, so that the portion of the shaft body extending into the sleeve can be retained within the sleeve.

[0007] The motor proposed in this application can be used in vehicles. The vehicle has a transmission component connected to the motor, and the motor drives the transmission component to rotate. The transmission component can be a ball screw. The motor includes a stator, a rotor, and a shaft assembly. The shaft assembly is connected to the rotor. When the motor is running, the rotor drives the shaft assembly to rotate relative to the stator. The transmission component is mounted on the shaft assembly, and the shaft assembly drives the transmission component to rotate.

[0008] Furthermore, the shaft assembly includes a sleeve and a shaft body, a portion of which extends into the sleeve and is welded to the sleeve, so that the shaft body and the sleeve become an integral structure, and the sleeve and the shaft body can rotate synchronously.

[0009] Furthermore, the shaft body has a hollow structure, which reduces the weight of the shaft body and thus the overall weight of the shaft assembly, which is beneficial for the lightweight design of the product.

[0010] Understandably, if the weld between the shaft and the sleeve fails, it can easily lead to separation of the shaft and sleeve, or a reduction in the integrity of the shaft assembly, preventing the sleeve and shaft from rotating synchronously. To prevent separation of the shaft and sleeve and improve the reliability of the shaft assembly, this application provides structures for limiting both the sleeve and the shaft. Specifically, the sleeve has a first limiting part, and the shaft has a second limiting part, which are adapted to each other. The shaft is connected to the sleeve through the cooperation of the first and second limiting parts. In the event of a weld failure between the sleeve and the shaft, the portion of the shaft extending into the sleeve can remain inside the sleeve through the cooperation of the first and second limiting parts. Specifically, when the weld between the sleeve and the shaft fails, and the first and second limiting parts cooperate, the shaft and sleeve are connected to prevent relative movement along the axial direction of the shaft. The portion of the shaft extending into the sleeve remains inside the sleeve, preventing separation of the shaft and sleeve. If the welding between the sleeve and the shaft fails and the first and second limiting parts do not cooperate with each other, the first and second limiting parts will no longer limit the shaft and the sleeve, and the shaft can be separated from the sleeve.

[0011] By providing a first limiting part in the sleeve and a second limiting part adapted to the first limiting part in the shaft, the sleeve and shaft can be limited by the cooperation of the first and second limiting parts. Even if the welding between the sleeve and the shaft fails, the shaft and sleeve can still be prevented from separating by the cooperation of the first and second limiting parts, thereby improving the reliability and safety level of the shaft assembly and thus improving the reliability and safety of the motor.

[0012] The motor described above according to this utility model may also have the following distinguishing technical features:

[0013] In some technical solutions, optionally, the first limiting part includes: at least one first mounting hole disposed on the sleeve; at least one limiting member corresponding to the first mounting hole; the second limiting part includes: at least one second mounting hole disposed on the shaft body, the second mounting hole corresponding to the first mounting hole, the limiting member passing through the corresponding first mounting hole radially along the sleeve and inserted into the corresponding second mounting hole radially along the shaft body to limit the sleeve and shaft body; and / or the first limiting part further includes: a first thread disposed on the inner wall of the sleeve; the second limiting part further includes: a second thread disposed on the outer wall of the shaft body, the first thread and the second thread being adapted to each other. In this technical solution, the structure of the first limiting part and the second limiting part is defined. The first limiting part and the second limiting part can have various structural forms. In one possible technical solution, the cooperation between the first limiting part and the second limiting part is a limiting member cooperation. Specifically, the first limiting part includes at least one first mounting hole and at least one limiting member. The first mounting hole is located on the sleeve, and the number of limiting members is the same as the number of first mounting holes. The limiting members are correspondingly arranged with respect to the first mounting holes. The second limiting part includes at least one second mounting hole, which is located on the shaft and corresponds to the first mounting hole. The limiting member passes through the corresponding first mounting hole radially along the sleeve and is inserted into the corresponding second mounting hole radially along the shaft. This allows the limiting member to limit the sleeve and shaft, preventing the sleeve from separating from the shaft.

[0014] The limiting component can be a pin, with the first and second mounting holes being smooth holes. Inserting the limiting component into the first and second mounting holes will limit the movement of the sleeve and shaft. Alternatively, the limiting component can be a screw, with the first mounting hole being a smooth hole and the second mounting hole being a threaded hole. When the limiting component is inserted into the second mounting hole, it engages with the thread on the second mounting hole, thus both limiting the movement of the sleeve and shaft and preventing the limiting component from dislodging from the second mounting hole.

[0015] In another possible technical solution, the first limiting part and the second limiting part are engaged by a threaded connection. Specifically, the first limiting part includes a first thread located on the inner wall of the sleeve, and the second limiting part includes a second thread located on the outer wall of the shaft. The first thread and the second thread are adapted to each other. When the first thread and the second thread are engaged, the sleeve and the shaft can be limited to prevent separation. Furthermore, compared to a structure that limits the sleeve and the shaft using limiting members, the limiting structure using the engagement of the first thread and the second thread can not only limit the shaft and the sleeve axially but also radially, further improving the integrity of the shaft assembly.

[0016] In another possible technical solution, the fit between the first limiting part and the second limiting part includes both limiting element fit and threaded fit. Specifically, the first limiting part includes a first mounting hole, a limiting element, and a first thread; the second limiting part includes a second mounting hole and a second thread. This provides a double anti-disengagement structure between the sleeve and the shaft, further improving the reliability and safety level of the shaft assembly.

[0017] In some technical solutions, the limiting element is optionally fixedly connected to the sleeve.

[0018] In this technical solution, the connection relationship between the limiting member and the sleeve is defined. Specifically, the limiting member and the sleeve are fixedly connected. After the operator inserts the limiting member into the first mounting hole and the second mounting hole, the limiting member undergoes further processing to ensure a fixed connection between the limiting member and the sleeve. This prevents the limiting member from dislodging from the first mounting hole and the second mounting hole, improving the reliability of the limiting member and thus enhancing the safety level of the shaft assembly.

[0019] In some technical solutions, optionally, the end of the limiting member facing outward is welded to the sleeve at the first mounting hole.

[0020] In this technical solution, the connection position between the limiting member and the sleeve is defined. Specifically, the end of the limiting member facing outward is fixedly connected to the sleeve, and the limiting member is welded to the sleeve at the first mounting hole. After the operator inserts the limiting member into the first and second mounting holes, one end of the limiting member protrudes from the sleeve at the first mounting hole, facilitating welding operations. By welding the end of the limiting member facing outward to the sleeve at the first mounting hole, it facilitates operator operation and prevents the limiting member from dislodging from the first and second mounting holes, improving the reliability of the limiting member and thus enhancing the safety level of the shaft assembly.

[0021] In another possible technical solution, the limiting component can also be fixedly connected to the sleeve by adhesive bonding. For example, before the operator inserts the limiting component into the first mounting hole and the second mounting hole, an adhesive (such as anaerobic adhesive) can be applied to the inner walls of the first mounting hole and the second mounting hole. After the limiting component is inserted into the first mounting hole and the second mounting hole, the limiting component is bonded to the sleeve, thus achieving a fixed connection between the limiting component and the sleeve.

[0022] In some technical solutions, the second mounting hole may optionally be a through hole or a blind hole.

[0023] In this technical solution, the structure of the second mounting hole is defined. Specifically, the second mounting hole can be a through hole or a blind hole. After the limiting member passes through the first mounting hole, it is inserted into the second mounting hole so that a part of the limiting member is located in the second mounting hole, thereby limiting the sleeve and the shaft and preventing the sleeve and the shaft from separating axially.

[0024] In some technical solutions, optionally, when there are multiple limiting members, the multiple limiting members are arranged sequentially along the circumference of the sleeve.

[0025] In this technical solution, the number and distribution of the limiting components are limited. There can be multiple limiting components, which are arranged sequentially along the circumference of the sleeve. This increases the number of limiting points on the sleeve and shaft, making the force on the sleeve and shaft more balanced, further improving the reliability of the limiting components, and thus enhancing the safety level of the shaft assembly.

[0026] In one possible technical solution, multiple limiting components are evenly distributed along the circumference of the sleeve. This can balance the forces on the sleeve and the shaft, improving the overall stability of the shaft assembly.

[0027] In some technical solutions, optionally, the second thread is provided at the end of the shaft, and the second mounting hole is located on the side of the end of the second thread away from the shaft.

[0028] In this technical solution, the positions of the second thread and the second mounting hole are defined. The second thread is located at the end of the shaft. During the connection between the shaft and the sleeve, the operator first inserts the end of the shaft with the second thread into the sleeve. The second thread on the shaft engages with the first thread on the sleeve to connect the shaft and the sleeve. By placing the second thread at the end of the shaft, the shaft and sleeve can be positioned through the threaded connection during the initial insertion of the shaft into the sleeve, thus avoiding problems such as oblique insertion of the shaft or unstable connection with the sleeve.

[0029] Furthermore, the second mounting hole is located on the side of the second thread away from the shaft. After the first thread and the second thread are connected in place, the first mounting hole is aligned with the corresponding second mounting hole. The limiting member passes through the first mounting hole and is inserted into the second mounting hole to axially limit the sleeve and the shaft, thereby further improving the connection reliability between the sleeve and the shaft.

[0030] The second mounting hole avoids the second thread to prevent the limiting member from affecting the connection between the first and second threads when it is inserted into the second mounting hole.

[0031] In some technical solutions, optionally, the end of the shaft has a mounting section, at least a portion of which extends into the sleeve, a second thread and / or a second mounting hole are provided in the mounting section, and the radial dimension of the mounting section is smaller than the radial dimension of the portion of the shaft adjacent to the mounting section.

[0032] In this technical solution, the structure of the shaft is further defined. The end of the shaft has a mounting section, and when the shaft is connected to the sleeve, at least a portion of the mounting section extends into the sleeve. A second thread and / or a second mounting hole are provided in the mounting section. When the mounting section extends into the sleeve, the second thread engages with the first thread on the sleeve, or the second mounting hole aligns with the first mounting hole on the sleeve. A limiting member is inserted into the first and second mounting holes to axially limit the movement of the sleeve and the shaft, preventing separation of the shaft from the sleeve.

[0033] Furthermore, the radial dimension of the mounting section is smaller than the radial dimension of the portion of the shaft adjacent to the mounting section, meaning the outer surface of the shaft has a stepped structure. This allows for a reduction in the weight of the shaft while ensuring its strength meets usage requirements, thus facilitating lightweight product design.

[0034] In some technical solutions, optionally, along the axial direction of the shaft, the length of the mounting section is D, and the length of the second thread is d, where D and d satisfy 0.5. <d / D<0.8。

[0035] In this technical solution, the ratio range between the length of the second thread and the length of the mounting section is limited. Specifically, along the axial direction of the shaft, the length of the mounting section is D, and the length of the second thread is d, where D and d satisfy 0.5. <d / D<0.8。

[0036] Understandably, if the length of the second thread is too short, the connection length between the shaft and the sleeve will be too short, resulting in poor reliability of the connection between the first and second threads, and the shaft may easily detach from the sleeve. Therefore, this application limits the ratio of the length of the second thread to the length of the mounting section to be greater than 0.5 to ensure that the length of the second thread meets the reliability requirements for the connection between the shaft and the sleeve. Furthermore, a certain distance needs to be left at the root of the mounting section during the machining of the second thread. Therefore, this application limits the ratio of the length of the second thread to the length of the mounting section to be less than 0.8 to leave a certain distance between the second thread and the root of the mounting section, thereby reducing the machining difficulty of the second thread.

[0037] In some technical solutions, the sleeve optionally includes: a first step portion, the inner circumferential surface of the first step portion being a circular surface, the inner circumferential surface of the first step portion engaging with the outer circumferential surface of the mounting section; and a second step portion, the inner circumferential surface of the second step portion being a circular surface, the second step portion being adjacent to the first step portion, and the inner diameter of the second step portion being smaller than the inner diameter of the first step portion.

[0038] In this technical solution, the structure of the sleeve is defined. The sleeve has a stepped structure, including a first stepped portion and a second stepped portion. The inner circumferential surface of the first stepped portion mates with the outer circumferential surface of the mounting section. The second stepped portion is adjacent to the first stepped portion, and both the first and second stepped portions have circumferential surfaces. The inner diameter of the second stepped portion is smaller than that of the first stepped portion. Thus, the second stepped portion can axially limit the shaft. Even without a threaded connection between the shaft and the sleeve, when the shaft is inserted into the sleeve, the second stepped portion can axially stop the shaft, thus providing axial limitation. Furthermore, by designing the sleeve as a stepped structure, the weight of the sleeve can be reduced while ensuring the sleeve's strength meets usage requirements, which is beneficial for lightweight product design.

[0039] In some technical solutions, optionally, the welding position between the shaft and the sleeve is located at the edge of the sleeve.

[0040] In this technical solution, the connection between the shaft and the sleeve is further defined. The welding position between the shaft and the sleeve is located at the edge of the sleeve. After the shaft is inserted into the sleeve, the shaft and the sleeve are positioned by the engagement of the first and second threads and / or by a limiting component, and then welding is performed between the shaft and the sleeve to maintain relative fixation. Specifically, the welding position is located at the edge of the sleeve. By setting the welding position between the sleeve and the shaft at the edge of the sleeve, it is convenient for the operator to perform welding operations without having to reach into the sleeve. Furthermore, the filler metal between the sleeve and the shaft fills the gap, thus providing some protection to the inside of the sleeve and reducing the entry of external impurities.

[0041] The second aspect of this utility model also provides a vehicle, comprising: the motor proposed in the first aspect of this utility model; a transmission component; and a shaft assembly installed in the motor, the shaft assembly being capable of driving the transmission component to rotate.

[0042] The vehicle proposed in this application includes a motor and a transmission component. The transmission component is mounted on a shaft assembly within the motor. When the motor is running, the shaft assembly drives the transmission component to rotate. The transmission component can connect to other components in the vehicle, thus realizing its transmission function. The transmission component can be a ball screw.

[0043] The vehicle provided by the second aspect of this utility model, having the motor proposed in the first aspect of this utility model, has all the beneficial effects of a motor.

[0044] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0045] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0046] Figure 1 One of the structural schematic diagrams of a shaft assembly according to an embodiment of the present invention is shown;

[0047] Figure 2 A schematic diagram of the sleeve structure according to an embodiment of the present invention is shown;

[0048] Figure 3 A schematic diagram of the structure of a shaft without a second thread according to an embodiment of the present invention is shown;

[0049] Figure 4 A schematic diagram of the structure of a limiting member according to an embodiment of the present invention is shown;

[0050] Figure 5 This invention provides a schematic diagram of a shaft assembly that uses a limiting member to limit the sleeve and shaft body according to an embodiment of the present invention.

[0051] Figure 6 A schematic diagram of a shaft with a second thread according to an embodiment of the present invention is shown;

[0052] Figure 7 This invention provides a schematic diagram of a shaft assembly that uses a limiting member and a threaded connection to limit the movement of a sleeve and a shaft, according to an embodiment of the present invention.

[0053] Figure 8 A schematic diagram of the structure of a motor according to an embodiment of the present invention is shown;

[0054] Figure 9 The second schematic diagram shows the structure of a shaft assembly according to an embodiment of the present invention.

[0055] in, Figures 1 to 9 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0056] 100 Shaft assembly, 110 Sleeve, 111 First step, 112 Second step, 120 Shaft body, 121 Mounting section, 130 First limiting part, 131 First mounting hole, 132 Limiting element, 133 First thread, 140 Second limiting part, 141 Second mounting hole, 142 Second thread, 200 Motor, 210 Stator, 220 Rotor. Detailed Implementation

[0057] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0058] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0059] The following reference Figures 1 to 9 This invention describes a motor 200 and a vehicle provided according to some embodiments of the present invention.

[0060] In one embodiment according to this application, such as Figure 1 , Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, this application proposes a motor 200, which can be connected to a transmission component. The motor 200 includes: a stator 210; a rotor 220; and a shaft assembly 100 connected to the rotor 220. The rotor 220 drives the shaft assembly 100 to rotate relative to the stator 210. The shaft assembly 100 is used to install the transmission component and drives the transmission component to rotate. The shaft assembly 100 includes: a sleeve 110; and a shaft body 120. A portion of the shaft body 120 extends into the sleeve 110 and is welded to the sleeve 110. The shaft body 120 has a hollow structure. The sleeve 110 has a first limiting portion 130, and the shaft body 120 has a second limiting portion 140. The first limiting portion 130 and the second limiting portion 140 are adapted to each other. The shaft body 120 is connected to the sleeve 110 through the cooperation of the first limiting portion 130 and the second limiting portion 140, so that the portion of the shaft body 120 extending into the sleeve 110 can be retained within the sleeve 110.

[0061] The motor 200 proposed in this application can be used in a vehicle. The vehicle has a transmission component connected to the motor 200, and the motor 200 drives the transmission component to rotate. The transmission component can be a ball screw. The motor 200 includes a stator 210, a rotor 220, and a shaft assembly 100. The shaft assembly 100 is connected to the rotor 220. When the motor 200 is running, the rotor 220 drives the shaft assembly 100 to rotate relative to the stator 210. The transmission component is mounted on the shaft assembly 100, and the shaft assembly 100 drives the transmission component to rotate.

[0062] Furthermore, the shaft assembly 100 includes a sleeve 110 and a shaft body 120. A portion of the shaft body 120 extends into the sleeve 110, and the shaft body 120 is welded to the sleeve 110, so that the shaft body 120 and the sleeve 110 become an integral structure, and the sleeve 110 and the shaft body 120 can rotate synchronously. Furthermore, the shaft body 120 has a hollow structure, which can reduce the weight of the shaft body 120, thereby reducing the overall weight of the shaft assembly 100, which is beneficial to the lightweight design of the product.

[0063] Understandably, if the welding between the shaft 120 and the sleeve 110 fails, it can easily lead to the separation of the shaft 120 and the sleeve 110, or a reduction in the integrity of the shaft assembly 100, causing the sleeve 110 and the shaft 120 to fail to rotate synchronously. To prevent the shaft 120 from separating from the sleeve 110 and to improve the reliability of the shaft assembly 100, this application provides structures on the sleeve 110 and the shaft 120 respectively for limiting their movement. Specifically, the sleeve 110 has a first limiting part 130, and the shaft 120 has a second limiting part 140. The first limiting part 130 and the second limiting part 140 are adapted to each other. The shaft 120 is connected to the sleeve 110 through the cooperation of the first limiting part 130 and the second limiting part 140. In the event of a welding failure between the sleeve 110 and the shaft 120, the portion of the shaft 120 that extends into the sleeve 110 can continue to be held inside the sleeve 110 through the cooperation of the first limiting part 130 and the second limiting part 140. Specifically, when the weld between the sleeve 110 and the shaft 120 fails, and the first limiting part 130 and the second limiting part 140 cooperate with each other, the shaft 120 is connected to the sleeve 110 to prevent relative movement between the shaft 120 and the sleeve 110 along the axial direction of the shaft 120. The portion of the shaft 120 extending into the sleeve 110 remains within the sleeve 110, preventing separation of the shaft 120 from the sleeve 110. When the weld between the sleeve 110 and the shaft 120 fails, and the first limiting part 130 and the second limiting part 140 do not cooperate with each other, the first limiting part 130 and the second limiting part 140 no longer limit the shaft 120 and the sleeve 110, and the shaft 120 can then be separated from the sleeve 110.

[0064] By providing a first limiting part 130 in the sleeve 110 and a second limiting part 140 adapted to the first limiting part 130 in the shaft 120, the sleeve 110 and the shaft 120 can be limited by the cooperation of the first limiting part 130 and the second limiting part 140. Even if the welding between the sleeve 110 and the shaft 120 fails, the shaft 120 can still be prevented from separating from the sleeve 110 by the cooperation of the first limiting part 130 and the second limiting part 140, thereby improving the reliability and safety level of the shaft assembly 100, and thus improving the reliability and safety of the motor 200.

[0065] In some embodiments, optionally, such as Figure 5 and Figure 7 As shown, the first limiting part 130 includes: at least one first mounting hole 131 disposed on the sleeve 110; at least one limiting member 132, the limiting member 132 being correspondingly disposed with the first mounting hole 131; the second limiting part 140 includes: at least one second mounting hole 141 disposed on the shaft 120, the second mounting hole 141 being correspondingly disposed with the first mounting hole 131, the limiting member 132 passing through the corresponding first mounting hole 131 radially along the sleeve 110 and being inserted into the corresponding second mounting hole 141 radially along the shaft 120 to limit the sleeve 110 and the shaft 120; and / or the first limiting part 130 further includes: a first thread 133 disposed on the inner wall of the sleeve 110; the second limiting part 140 further includes: a second thread 142 disposed on the outer wall of the shaft 120, the first thread 133 and the second thread 142 being adapted to each other.

[0066] In this embodiment, the structures of the first limiting portion 130 and the second limiting portion 140 are defined. The first limiting portion 130 and the second limiting portion 140 can have various structural forms. For example... Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in one possible embodiment, the first limiting part 130 and the second limiting part 140 are engaged by limiting members 132. Specifically, the first limiting part 130 includes at least one first mounting hole 131 and at least one limiting member 132. The first mounting hole 131 is located in the sleeve 110, and the number of limiting members 132 is the same as the number of first mounting holes 131, with each limiting member 132 corresponding to one of the first mounting holes 131. The second limiting part 140 includes at least one second mounting hole 141 located in the shaft 120 and corresponding to one of the first mounting holes 131. The limiting member 132 passes through the corresponding first mounting hole 131 radially along the sleeve 110 and is inserted into the corresponding second mounting hole 141 radially along the shaft 120. This allows the limiting member 132 to limit the sleeve 110 and the shaft 120, preventing the sleeve 110 from separating from the shaft 120.

[0067] The limiting member 132 can be a pin, and the first mounting hole 131 and the second mounting hole 141 are smooth holes. When the limiting member 132 is inserted into the first mounting hole 131 and the second mounting hole 141, it can limit the sleeve 110 and the shaft 120. The limiting member 132 can also be a screw, with the first mounting hole 131 being a smooth hole and the second mounting hole 141 being a threaded hole. When the limiting member 132 is inserted into the second mounting hole 141, it engages with the thread on the second mounting hole 141. In this way, it can limit the sleeve 110 and the shaft 120 and also prevent the limiting member 132 from coming out of the second mounting hole 141.

[0068] In another possible embodiment, the first limiting part 130 and the second limiting part 140 are engaged by a threaded connection. Specifically, the first limiting part 130 includes a first thread 133 located on the inner wall of the sleeve 110, and the second limiting part 140 includes a second thread 142 located on the outer wall of the shaft 120. The first thread 133 and the second thread 142 are adapted to each other. When the first thread 133 and the second thread 142 are engaged, the sleeve 110 and the shaft 120 can be limited to prevent the sleeve 110 from separating from the shaft 120. Furthermore, compared to the structure that limits the sleeve 110 and shaft 120 by limiting member 132, the limiting structure that uses the first thread 133 and the second thread 142 to cooperate can not only limit the shaft 120 and sleeve 110 axially, but also limit the shaft 120 and sleeve 110 radially, further improving the integrity of the shaft assembly 100.

[0069] In yet another possible embodiment, such as Figure 7 As shown, the engagement between the first limiting part 130 and the second limiting part 140 includes both the engagement with the limiting member 132 and a threaded engagement. Specifically, the first limiting part 130 includes a first mounting hole 131, a limiting member 132, and a first thread 133; the second limiting part 140 includes a second mounting hole 141 and a second thread 142. This provides a double anti-disengagement structure between the sleeve 110 and the shaft 120, further enhancing the reliability and safety level of the shaft assembly 100.

[0070] In some embodiments, the limiting member 132 is optionally fixedly connected to the sleeve 110.

[0071] In this embodiment, the connection relationship between the limiting member 132 and the sleeve 110 is defined. Specifically, the limiting member 132 is fixedly connected to the sleeve 110. After the operator inserts the limiting member 132 into the first mounting hole 131 and the second mounting hole 141, the limiting member 132 undergoes further processing to ensure that the limiting member 132 is fixedly connected to the sleeve 110. This prevents the limiting member 132 from dislodging from the first mounting hole 131 and the second mounting hole 141, improving the reliability of the limiting member 132 and thus enhancing the safety level of the shaft assembly 100.

[0072] In some embodiments, optionally, the end of the limiting member 132 facing outward is welded to the sleeve 110 at the first mounting hole 131.

[0073] In this embodiment, the connection position between the limiting member 132 and the sleeve 110 is defined. Specifically, the end of the limiting member 132 facing outward is fixedly connected to the sleeve 110, and the limiting member 132 is welded to the sleeve 110 at the first mounting hole 131. After the operator inserts the limiting member 132 into the first mounting hole 131 and the second mounting hole 141, one end of the limiting member 132 protrudes from the sleeve 110 at the first mounting hole 131, facilitating welding operations by the operator. By welding the end of the limiting member 132 facing outward to the sleeve 110 at the first mounting hole 131, the operator can operate the device more easily, and the limiting member 132 can be prevented from coming out of the first mounting hole 131 and the second mounting hole 141, thus improving the reliability of the limiting member 132 and consequently enhancing the safety level of the shaft assembly 100.

[0074] In another possible embodiment, the limiting member 132 can also be fixedly connected to the sleeve 110 by adhesive bonding. For example, before the operator inserts the limiting member 132 into the first mounting hole 131 and the second mounting hole 141, an adhesive (such as anaerobic adhesive) can be applied to the inner walls of the first mounting hole 131 and the second mounting hole 141. After the limiting member 132 is inserted into the first mounting hole 131 and the second mounting hole 141, the limiting member 132 is bonded to the sleeve 110, thus achieving a fixed connection between the limiting member 132 and the sleeve 110.

[0075] In some embodiments, the second mounting hole 141 may be a through hole or a blind hole.

[0076] In this embodiment, the structure of the second mounting hole 141 is defined. Specifically, the second mounting hole 141 can be a through hole or a blind hole. After the limiting member 132 passes through the first mounting hole 131, it is inserted into the second mounting hole 141 so that a part of the limiting member 132 is located in the second mounting hole 141, thereby limiting the sleeve 110 and the shaft 120 and preventing the sleeve 110 and the shaft 120 from separating axially.

[0077] In some embodiments, optionally, when there are multiple limiting members 132, the multiple limiting members 132 are arranged sequentially along the circumference of the sleeve 110.

[0078] In this embodiment, the number and distribution of the limiting members 132 are limited. There can be multiple limiting members 132, which are sequentially arranged along the circumference of the sleeve 110. This increases the limiting points on the sleeve 110 and the shaft 120, making the force on the sleeve 110 and the shaft 120 more balanced, further improving the reliability of the limiting members 132, and thus enhancing the safety level of the shaft assembly 100.

[0079] In one possible embodiment, multiple limiting members 132 are evenly distributed along the circumference of the sleeve 110. In this way, the force on the sleeve 110 and the shaft 120 can be balanced, improving the overall stability of the shaft assembly 100.

[0080] In some embodiments, optionally, such as Figure 6 As shown, the second thread 142 is provided at the end of the shaft 120, and the second mounting hole 141 is located on the side of the second thread 142 away from the end of the shaft 120.

[0081] In this embodiment, the positions of the second thread 142 and the second mounting hole 141 are defined. The second thread 142 is located at the end of the shaft 120. During the connection between the shaft 120 and the sleeve 110, the operator first inserts the end of the shaft 120 with the second thread 142 into the sleeve 110. The second thread 142 on the shaft 120 engages with the first thread 133 on the sleeve 110 to connect the shaft 120 and the sleeve 110. By providing the second thread 142 at the end of the shaft 120, the shaft 120 and the sleeve 110 can be positioned by the threaded connection when the shaft 120 is initially inserted into the sleeve 110, thus avoiding problems such as the shaft 120 being inserted at an angle or the connection with the sleeve 110 being unstable.

[0082] Furthermore, the second mounting hole 141 is located on the side of the end of the second thread 142 away from the shaft 120. After the first thread 133 and the second thread 142 are connected in place, the first mounting hole 131 is aligned with the corresponding second mounting hole 141. The limiting member 132 passes through the first mounting hole 131 and is inserted into the second mounting hole 141 to axially limit the sleeve 110 and the shaft 120 through the limiting member 132, thereby further improving the connection reliability between the sleeve 110 and the shaft 120.

[0083] The second mounting hole 141 avoids the second thread 142 to prevent the limiting member 132 from affecting the connection between the first thread 133 and the second thread 142 when it is inserted into the second mounting hole 141.

[0084] In some embodiments, optionally, such as Figure 6 As shown, the end of the shaft 120 has a mounting section 121, at least a portion of which extends into the sleeve 110. A second thread 142 and / or a second mounting hole 141 are provided in the mounting section 121. The radial dimension of the mounting section 121 is smaller than the radial dimension of the portion of the shaft 120 adjacent to the mounting section 121.

[0085] In this embodiment, the structure of the shaft 120 is further defined. The end of the shaft 120 has a mounting section 121. When the shaft 120 is connected to the sleeve 110, at least a portion of the mounting section 121 extends into the sleeve 110. A second thread 142 and / or a second mounting hole 141 are provided in the mounting section 121. When the mounting section 121 extends into the sleeve 110, the second thread 142 engages with the first thread 133 on the sleeve 110, or the second mounting hole 141 aligns with the first mounting hole 131 on the sleeve 110. A limiting member 132 is inserted into the first mounting hole 131 and the second mounting hole 141 to axially limit the sleeve 110 and the shaft 120, preventing the shaft 120 from separating from the sleeve 110.

[0086] Furthermore, the radial dimension of the mounting section 121 is smaller than the radial dimension of the portion of the shaft 120 adjacent to the mounting section 121, meaning the outer surface of the shaft 120 has a stepped structure. This allows for a reduction in the weight of the shaft 120 while ensuring its strength meets usage requirements, thus facilitating lightweight product design.

[0087] In some embodiments, optionally, such as Figure 6 As shown, along the axial direction of the shaft 120, the length of the mounting section 121 is D, and the length of the second thread 142 is d, where D and d satisfy 0.5. <d / D<0.8。

[0088] In this embodiment, the ratio range between the length of the second thread 142 and the length of the mounting section 121 is defined. Specifically, along the axial direction of the shaft 120, the length of the mounting section 121 is D, and the length of the second thread 142 is d, where D and d satisfy 0.5. <d / D<0.8。

[0089] Understandably, if the length of the second thread 142 is too short, the connection length between the shaft 120 and the sleeve 110 will be too short, resulting in poor connection reliability between the first thread 133 and the second thread 142, and the shaft 120 will easily detach from the sleeve 110. Therefore, this application limits the ratio of the length of the second thread 142 to the length of the mounting section 121 to be greater than 0.5 to ensure that the length of the second thread 142 meets the connection reliability requirements between the shaft 120 and the sleeve 110. Furthermore, the second thread 142 needs to have a certain distance at the root of the mounting section 121 during machining. Therefore, this application limits the ratio of the length of the second thread 142 to the length of the mounting section 121 to be less than 0.8, so that a certain distance is left between the second thread 142 and the root of the mounting section 121, thereby reducing the machining difficulty of the second thread 142.

[0090] In some embodiments, optionally, such as Figure 5 and Figure 7As shown, the sleeve 110 includes: a first step portion 111, the inner circumferential surface of the first step portion 111 is a circular surface, and the inner circumferential surface of the first step portion 111 mates with the outer circumferential surface of the mounting section 121; and a second step portion 112, the inner circumferential surface of the second step portion 112 is a circular surface, the second step portion 112 is disposed adjacent to the first step portion 111, and the inner diameter of the second step portion 112 is smaller than the inner diameter of the first step portion 111.

[0091] In this embodiment, the structure of the sleeve 110 is defined. The sleeve 110 has a stepped structure, including a first stepped portion 111 and a second stepped portion 112. The inner circumferential surface of the first stepped portion 111 mates with the outer circumferential surface of the mounting section 121. The second stepped portion 112 is adjacent to the first stepped portion 111. Both the inner circumferential surfaces of the first stepped portion 111 and the second stepped portion 112 are circumferential surfaces, and the inner diameter of the second stepped portion 112 is smaller than the inner diameter of the first stepped portion 111. Thus, the second stepped portion 112 can axially limit the shaft 120. Even without a threaded connection between the shaft 120 and the sleeve 110, when the shaft 120 is inserted into the sleeve 110, the second stepped portion 112 can axially stop the shaft 120, thereby limiting its axial movement. Furthermore, by designing the sleeve 110 as a stepped structure, the weight of the sleeve 110 can be reduced while ensuring that the strength of the sleeve 110 meets the usage requirements, which is beneficial to the lightweight design of the product.

[0092] In some embodiments, the welding position between the shaft 120 and the sleeve 110 is optionally located at the edge of the sleeve 110.

[0093] In this embodiment, the connection between the shaft 120 and the sleeve 110 is further defined. The welding position between the shaft 120 and the sleeve 110 is located at the edge of the sleeve 110. After the shaft 120 is inserted into the sleeve 110, the shaft 120 and the sleeve 110 are limited by the engagement of the first thread 133 and the second thread 142 and / or the limiting member 132, and then the shaft 120 is welded to maintain a relatively fixed relationship with the sleeve 110. Specifically, the welding position is located at the edge of the sleeve 110. By setting the welding position between the sleeve 110 and the shaft 120 at the edge of the sleeve 110, it is convenient for the operator to perform welding operations without having to insert into the sleeve 110 for welding. On the other hand, the welding material fills the gap between the sleeve 110 and the shaft 120, thereby providing a certain degree of protection for the interior of the sleeve 110 and reducing the entry of external impurities into the sleeve 110.

[0094] In a second aspect of the present utility model, a vehicle is further proposed, which includes the motor proposed in any of the above embodiments; a transmission member installed on the shaft assembly 100 in the motor 200, and the shaft assembly 100 can drive the transmission member to rotate.

[0095] The vehicle proposed in the present application includes a motor 200 and a transmission member. The transmission member is installed on the shaft assembly 100 in the motor 200. When the motor 200 is running, the shaft assembly 100 drives the transmission member to rotate, and the transmission member can be connected to other components in the vehicle, so as to achieve the transmission function of the transmission member. Among them, the transmission member can be a ball screw.

[0096] Since the vehicle provided in the second aspect of the present utility model includes the motor proposed in any of the above embodiments, it has all the beneficial effects of the motor.

[0097] In a possible embodiment, the present application proposes a motor 200, which includes a hollow shaft assembly (i.e., the shaft assembly 100), and the hollow shaft assembly is composed of a metal sleeve (i.e., the sleeve 110), a hollow shaft (i.e., the shaft body 120) and a pin (i.e., the limiting member 132). The end of the hollow shaft is inserted into the inner wall of the metal sleeve, and the hollow shaft and the metal sleeve are connected by welding. The welding positions are distributed along the circumferential direction of the hollow shaft and the metal sleeve, as Figure 1 shown. The metal sleeve and the hollow shaft are provided with circular holes (i.e., the first mounting hole 131 and the second mounting hole 141) in the circumferential direction, and the number of circular holes is multiple, as Figure 2 and Figure 3 shown. Pins are embedded in the circular holes. The pins are used to connect the metal sleeve and the hollow shaft, and the pins and the metal sleeve are connected by welding. The welding position is at the end of the pin, as Figure 5 shown. The inner wall of the metal sleeve is a multi-segment inner diameter structure.

[0098] For the hollow shaft assembly of the motor 200 proposed in the present application, the metal sleeve and the hollow shaft are connected by welding and pin connection, which improves the safety of realizing the torque transmission function. At the same time, the pin connection serves as a safety redundancy function to prevent the metal sleeve and the hollow shaft from loosening axially.

[0099] In another possible embodiment, the hollow shaft assembly is composed of a metal sleeve (i.e., the sleeve 110) with a thread (i.e., the first thread 133), a hollow shaft (i.e., the shaft body 120) with a thread (i.e., the second thread 142) and a pin. The sleeve 110 and the hollow shaft are provided with circular holes in the circumferential direction, and the number of circular holes is multiple. The metal sleeve and the hollow shaft are connected by threads. The length of the thread on the hollow shaft is d, and the length of the shaft section (i.e., the mounting section 121) with a thread on the hollow shaft is D. The dimensional requirement satisfies 0.5 < d / D < 0.8, as Figure 6As shown. A hollow shaft is screwed into a metal sleeve, and a pin is inserted into a circular hole to connect the metal sleeve and the hollow shaft. The pin and the metal sleeve are then connected by welding, with the welded part at the end of the pin, as shown. Figure 7 As shown.

[0100] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0101] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0102] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric machine characterized in that, The motor is capable of connecting to a transmission component, and the motor includes: stator; Rotor; A shaft assembly connected to the rotor, the rotor driving the shaft assembly to rotate relative to the stator, the shaft assembly for mounting the transmission component, the shaft assembly driving the transmission component to rotate, the shaft assembly comprising: Sleeve; A shaft, a portion of which extends into the sleeve and is welded to the sleeve, the shaft having a hollow structure; The sleeve has a first limiting part, and the shaft has a second limiting part. The first limiting part and the second limiting part are adapted to each other. The shaft is connected to the sleeve through the cooperation of the first limiting part and the second limiting part, so that the part of the shaft extending into the sleeve can be kept inside the sleeve.

2. The motor according to claim 1, characterized in that, The first limiting part includes: at least one first mounting hole disposed on the sleeve; at least one limiting member corresponding to the first mounting hole; the second limiting part includes: at least one second mounting hole disposed on the shaft body, the second mounting hole corresponding to the first mounting hole, the limiting member passing through the corresponding first mounting hole radially along the sleeve and inserted into the corresponding second mounting hole radially along the shaft body to limit the sleeve and the shaft body; and / or The first limiting part further includes: a first thread, provided on the inner wall of the sleeve; the second limiting part further includes: a second thread, provided on the outer wall of the shaft, wherein the first thread and the second thread are adapted to each other.

3. The motor according to claim 2, characterized in that, The limiting member is fixedly connected to the sleeve.

4. The motor according to claim 3, characterized in that, The end of the limiting member facing outward is welded to the sleeve at the first mounting hole.

5. The motor according to claim 2, characterized in that, The second mounting hole is either a through hole or a blind hole.

6. The motor according to claim 2, characterized in that, When there are multiple limiting members, the multiple limiting members are arranged sequentially along the circumference of the sleeve.

7. The motor according to claim 2, characterized in that, The second thread is located at the end of the shaft, and the second mounting hole is located on the side of the second thread away from the end of the shaft.

8. The motor according to claim 2, characterized in that, The shaft has a mounting section at its end, at least a portion of which extends into the sleeve. The second thread and / or the second mounting hole are provided in the mounting section, and the radial dimension of the mounting section is smaller than the radial dimension of the portion of the shaft adjacent to the mounting section.

9. The motor according to claim 8, characterized in that, Along the axial direction of the shaft, the length of the mounting section is D, and the length of the second thread is d, where D and d satisfy 0.

5. <d / D<0.8。 10. The electric machine of claim 8, wherein, The sleeve includes: The first step portion has an inner circumferential surface that is circular and mates with the outer circumferential surface of the mounting section. The second step portion has an inner circumferential surface that is circular. The second step portion is disposed adjacent to the first step portion, and the inner diameter of the second step portion is smaller than the inner diameter of the first step portion.

11. The motor according to any one of claims 1 to 10, characterized in that, The welding point between the shaft and the sleeve is located at the edge of the sleeve.

12. A vehicle characterized by comprising: include: The motor as described in any one of claims 1 to 11; A transmission component, a shaft assembly installed in the motor, the shaft assembly being capable of driving the transmission component to rotate.

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