Vehicle-mounted electrical device, power assembly and vehicle

Abstract

The utility model provides a vehicle-mounted electrical device, a power assembly and a vehicle. The vehicle-mounted electrical device comprises a cover plate, a groove-shaped bottom shell and a vibration reduction assembly. The cover plate and the groove-shaped bottom shell are used for defining a containing cavity. The groove bottom of the cover plate or the groove-shaped bottom shell comprises a through hole. The vibration reduction assembly comprises a bolt, an annular elastic piece and a nut. The bolt penetrates through the through hole and extends into the containing cavity. One end of the bolt is fixed to the groove bottom of the groove-shaped bottom shell or the cover plate, and the other end of the bolt is exposed out of the containing cavity. The two ends of the annular elastic piece are arranged between the groove bottom of the groove-shaped bottom shell and the cover plate. The annular elastic piece is sleeved on the bolt. The cover plate or the groove bottom of the groove-shaped bottom shell is used for enabling the annular elastic piece to be in a compressed state. The nut is used for being meshed with the other end of the bolt to adjust the pressed length of the annular elastic piece in the first direction. According to the vehicle-mounted electrical device, the vibration reduction assembly is matched with the groove bottom of the groove-shaped bottom shell and the cover plate, so that the vibration frequency of the vehicle-mounted electrical device can be repeatedly adjusted, the risk of resonance is reduced, and the NVH performance of the whole vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a vehicle-mounted electrical device, a powertrain and a vehicle. Background Art

[0002] In the new energy vehicle industry, in order to improve riding comfort, the NVH (Noise, Vibration, Harshness) performance of the vehicle has attracted much attention. Among them, the powertrain is one of the main sources of vehicle vibration and noise. During the operation of the powertrain, the vibration generated by the motor and reducer will affect the normal operation of the on-board electrical devices, and the vibration and noise can also be radiated to the entire vehicle through the on-board electrical devices. Therefore, it is urgent to improve the vibration and noise reduction performance of the on-board electrical devices to reduce the overall vibration and noise of the powertrain, ensure the normal operation of the powertrain, and improve the NVH performance of the vehicle. Utility Model Content

[0003] Embodiments of the present application provide a vehicle-mounted electrical device, a powertrain, and a vehicle.

[0004] In a first aspect, an embodiment of the present application provides a vehicle-mounted electrical device. The vehicle-mounted electrical device includes a cover plate, a groove-shaped bottom shell, and a vibration reduction assembly, wherein the cover plate and the groove bottom of the groove-shaped bottom shell are arranged in a first direction in a stacked manner, the cover plate and the groove-shaped bottom shell are used to enclose a receiving cavity, the receiving cavity is used to receive multiple electrical components of the vehicle-mounted electrical device, the groove bottom of the groove-shaped bottom shell or one of the cover plates includes a through hole, and the vibration reduction assembly includes a bolt, an annular elastic member, and a nut.

[0005] A bolt passes through a through hole along a first direction and extends into an accommodating cavity. The length of the bolt along the first direction is greater than the distance between a cover plate and the bottom of a groove of a groove-shaped bottom shell. One end of the bolt is fixed to the bottom of a groove of a groove-shaped bottom shell or the other of a cover plate, and the other end of the bolt is exposed in an accommodating cavity.

[0006] Two ends of an annular elastic member are arranged between a groove bottom of a groove-shaped bottom shell and a cover plate along a first direction, and an annular elastic member is sleeved on a bolt.

[0007] A nut is used to engage the other end of a bolt to adjust the compressed length of an annular elastic member along a first direction.

[0008] In the embodiment of the present application, the on-board electrical device will be subjected to vibrations from the motor and the reducer. When the natural vibration frequency of the on-board electrical device is close to the excitation frequency of the motor and the reducer, the on-board electrical device will resonate. Therefore, it is necessary to increase the difference in vibration frequency between the on-board electrical device and the motor and the reducer to avoid the harm caused by resonance. However, the excitation frequency of the motor and the reducer is not fixed, and the excitation frequencies of different structures in the motor and the reducer are also different. If only the cover plate or the bottom of the groove of the groove-shaped bottom shell is structurally improved, the effect of the change of the natural vibration frequency is limited by the already formed structure, and it cannot be adjusted multiple times according to actual needs, which will reduce the adaptability of the on-board electrical device to different excitation frequencies.

[0009] To solve the above problems, the embodiment of the present application realizes rapid and flexible adjustment of the natural vibration frequency of the vehicle-mounted electrical device by cooperating the vibration reduction assembly with the bottom of the groove-shaped bottom shell and the cover plate.

[0010] In an embodiment of the present application, the vibration reduction assembly includes a bolt and a nut, one end of the bolt extends into the accommodating cavity from a through hole of one of the bottom of the groove or the cover plate of the groove-shaped bottom shell, and then is fixed to the other of the bottom of the groove or the cover plate of the groove-shaped bottom shell. The length of the bolt along the first direction is greater than the spacing between the bottom of the groove of the groove-shaped bottom shell and the cover plate, so that the other end of the bolt is exposed in the accommodating cavity. The nut is engaged with the other end of the bolt, and the nut can drive one end of the bolt to move. It should be noted that one end of the bolt is fixed to the other of the bottom of the groove or the cover plate of the groove-shaped bottom shell, which does not mean that the bolt cannot move relative to the other of the bottom of the groove or the cover plate of the groove-shaped bottom shell. The fixing of one end of the bolt to the other of the bottom of the groove or the cover plate of the groove-shaped bottom shell means that when the bolt moves relative to the other of the bottom of the groove or the cover plate of the groove-shaped bottom shell, one end of the bolt can remain fixed to the other of the bottom of the groove or the cover plate of the groove-shaped bottom shell.

[0011] The vibration reduction assembly also includes an annular elastic member, which is sleeved on the portion of the bolt located in the accommodating cavity. One of the bottom of the groove or the cover plate of the groove-shaped bottom shell applies a force to the annular elastic member to compress the annular elastic member. Correspondingly, the annular elastic member also applies a reaction force to one of the bottom of the groove or the cover plate of the groove-shaped bottom shell. The natural vibration frequency is an inherent property of the vibration system and is related to the mass and stiffness of the system. The annular elastic member applies a reaction force to one of the bottom of the groove or the cover plate of the groove-shaped bottom shell, which is equivalent to reducing the effective mass of one of the bottom of the groove or the cover plate of the groove-shaped bottom shell that participates in the vibration, thereby being able to change the vibration frequency of one of the bottom of the groove or the cover plate of the groove-shaped bottom shell.

[0012] In the embodiment of the present application, the vibration frequency of one of the groove bottom or the cover plate of the groove-shaped bottom shell can be repeatedly adjusted multiple times through the cooperation between the annular elastic member and the bolts and nuts.

[0013] Specifically, the nut changes the spacing between one of the groove bottom or cover plate of the groove bottom shell and the other of the groove bottom or cover plate of the groove bottom shell by adjusting the relative position of one end of the bolt and the other of the groove bottom or cover plate of the groove bottom shell, thereby changing the compressed length of the annular elastic member. It can be understood that the interaction between the annular elastic member and one of the groove bottom or cover plate of the groove bottom shell is related to the compressed length of the annular elastic member. By adjusting the compressed length of the annular elastic member, the natural vibration frequency of one of the groove bottom or cover plate of the groove bottom shell can also be changed, that is, the natural vibration frequency of one of the groove bottom or cover plate of the groove bottom shell will not be limited to a fixed value by its own structure. In actual application scenarios, the vibration frequency of the on-board electrical device can be adjusted accordingly according to the vibration frequency of the excitation source, reducing the risk of resonance, so as to improve the NVH performance of the whole vehicle. In addition, the other ends of the nut and the bolt are exposed to the accommodating cavity, which is conducive to reducing the difficulty of adjusting the vibration frequency.

[0014] In one embodiment, a nut rotates to drive a bolt to move along a first direction to apply a force to one of a groove bottom of a groove-shaped bottom shell or a cover plate. One of the groove bottom of a groove-shaped bottom shell or a cover plate is used to transmit the force applied by a nut to an annular elastic member, so that one end of an annular elastic member moves relative to the other of the groove bottom of a groove-shaped bottom shell or a cover plate along the first direction, and one end of an annular elastic member moves toward one of the groove bottom of a groove-shaped bottom shell or a cover plate along the first direction.

[0015] In the embodiment of the present application, the nut is engaged with the other end of the bolt, and the rotation of the nut can drive the bolt to move in the first direction. During the movement of the bolt in the first direction, one of the bottom of the groove or the cover plate of the groove-shaped bottom shell is used to transmit the force applied by the nut to the annular elastic member, so that one end of the annular elastic member toward the bottom of the groove or the cover plate of the groove-shaped bottom shell moves with a bolt. After the movement of the annular elastic member is completed, the annular elastic member is structurally manifested as a change in the compressed length, and functionally manifested as a change in the reaction force on one of the bottom of the groove or the cover plate of the groove-shaped bottom shell.

[0016] In one embodiment, during the movement of a bolt along a first direction, the compression rate of an annular elastic member is greater than 0, the compression rate of an annular elastic member is less than or equal to 70%, and the compression rate of an annular elastic member along the first direction is the ratio of the difference between the natural length of an annular elastic member and the compressed length of an annular elastic member to the natural length of an annular elastic member.

[0017] In an embodiment of the present application, the ability of the annular elastic member to adjust the vibration frequency of one of the bottom of the groove or the cover plate of the groove-shaped bottom shell is positively correlated with the compression rate of the annular elastic member itself, but the compression rate of the annular elastic member cannot be too large, otherwise it will easily cause the annular elastic member to break and fail. The embodiment of the present application can take into account the effect of the change in the vibration frequency of one of the bottom of the groove or the cover plate of the groove-shaped bottom shell and the service life of the annular elastic member. In addition, the cooperation of the bolts, nuts and annular elastic members enables the compression rate of the annular elastic member to vary within a certain range, so that the vibration frequency of one of the bottom of the groove or the cover plate of the groove-shaped bottom shell can be adjusted according to the actual scenario, which is conducive to improving the adaptability of the on-board electrical device to different application scenarios or different excitation sources in the same application scenario.

[0018] In one embodiment, the ratio of the natural length of an annular elastic member along the first direction to the distance between the groove bottom of a groove-shaped bottom shell and a cover plate is greater than or equal to 0.1.

[0019] In the embodiment of the present application, the compression rate of the annular elastic member is greater than 0 and less than or equal to 70%. When the natural length of the annular elastic member is larger, the deformation of the annular elastic member in the vehicle-mounted electrical device is larger, so that the adjustable range of the vibration frequency of one of the groove bottom or the cover plate of the groove bottom shell is also increased. The present application controls the ratio of the natural length of the annular elastic member to the spacing between the groove bottom and the cover plate of the groove bottom shell to be greater than or equal to 0.1, which is conducive to improving the adaptability of one of the groove bottom or the cover plate of the groove bottom shell to excitation sources of different frequencies.

[0020] In one embodiment, the ratio of the distance between the center of a through hole and the center of the groove bottom of a groove bottom shell or one of the cover plates along the width direction of the groove bottom of a groove bottom shell or one of the cover plates to the width of the groove bottom of a groove bottom shell or one of the cover plates is less than or equal to 0.2. The ratio of the distance between the center of a through hole and the center of the groove bottom of a groove bottom shell or one of the cover plates along the length direction of the groove bottom of a groove bottom shell or one of the cover plates to the length of the groove bottom of a groove bottom shell or one of the cover plates is less than or equal to 0.2.

[0021] In the embodiment of the present application, the bolt passes through the through hole and the annular elastic member in sequence along the first direction, and the position of the center of the through hole determines the position of the bolt and the annular elastic member in the vehicle-mounted electrical device. The through hole is located in one of the bottom of the groove or the cover of the groove bottom shell, and the position of the through hole in one of the bottom of the groove or the cover of the groove bottom shell will affect the effect of the bolt and the annular elastic member in adjusting the vibration frequency.

[0022] In an embodiment of the present application, by shortening the distance between the through hole and the center of the bottom of the groove or one of the centers of the cover plate of the groove-shaped bottom shell, the load-bearing area with a larger amplitude in the bottom of the groove or one of the centers of the cover plate of the groove-shaped bottom shell is reduced, which can effectively increase the vibration frequency of the vehicle-mounted electrical device, achieve frequency avoidance between the vehicle-mounted electrical device and the excitation source, and alleviate the resonance problem.

[0023] In one embodiment, one end of a bolt is used to engage with the inner surface of a bolt hole, and the bolt is used to move relative to the inner surface of the bolt hole along a first direction. The length of the inner surface of the bolt hole along the first direction is greater than the maximum difference between the compressed length and the natural length of an annular elastic member.

[0024] In the embodiment of the present application, by adjusting the bolt to move along the first direction relative to the inner surface of the bolt hole, the spacing between the cover plate and the bottom of the groove of the groove-shaped bottom shell can be increased or decreased. After one end of the bolt passes through the through hole, it is threadedly connected to the inner surface of the bolt hole. The friction between the inner surface of the bolt hole and the bolt can ensure that after the operation of adjusting the bolt is completed, one end of the bolt is fixed in the bolt hole, that is, the bolt maintains a fixed connection relationship with the bottom of the groove of the groove-shaped bottom shell or the other in the cover plate. Therefore, one end of the bolt needs to be always connected to the bolt hole, and the moving space of one end of the bolt should be limited in the bolt hole, so as to keep the vibration frequency stable after adjustment. In the embodiment of the present application, the height of the inner surface of the bolt hole along the first direction is greater than the maximum difference between the compressed length and the natural length of the annular elastic member, that is, when the compression rate of the annular elastic member changes from 0% to 70%, one end of the bolt is always located in the bolt hole.

[0025] In one embodiment, the bottom of a groove-shaped bottom shell includes a protrusion, a protrusion direction of the protrusion along a first direction is toward a cover plate, the length of the protrusion along the first direction is greater than the thickness of a cover plate, the opening of a bolt hole is located at one end of the protrusion facing a cover plate, and the length of the inner surface of the bolt hole along the first direction is less than the length of a protrusion.

[0026] In the embodiment of the present application, the length of the protrusion along the first direction is greater than the thickness of the cover plate, so that the protrusion is more suitable for opening a bolt hole than the cover plate, so that the length of the inner surface of the bolt hole along the first direction can meet the requirements of bolt movement. Since the inner surface of the bolt hole is used to engage with one end of the bolt, the bolt hole is formed at the bottom of the groove of the groove-shaped bottom shell, which is equivalent to one end of the bolt being fixed to the bottom of the groove of the groove-shaped bottom shell. That is, when the length of the protrusion is greater than the thickness of the cover plate, the cover plate includes a through hole, and one end of the bolt is fixed to the bottom of the groove of the groove-shaped bottom shell.

[0027] In the embodiment of the present application, one end of the protrusion along the first direction faces the cover plate, the opening of the bolt hole is located at one end of the protrusion, and the bolt extends from the through hole of the cover plate into the bolt hole at the bottom of the groove of the groove-shaped bottom shell along the first direction. The nut applies a force to the cover plate, and the cover plate transmits the force applied by the nut to the annular elastic member, and one end of the annular elastic member moves relative to the bottom of the groove of the groove-shaped bottom shell along the first direction.

[0028] In one embodiment, a housing of an electrical component is fixed to the bottom of a groove of a groove-shaped bottom shell, the length of the housing of the electrical component along a first direction is greater than the thickness of a cover plate, an opening of a bolt hole is located on a surface of the housing of the electrical component facing a cover plate, and the length of an inner surface of a bolt hole along the first direction is less than the length of the housing of the electrical component.

[0029] In the embodiment of the present application, the bolt hole is not limited to being formed in the bottom of the groove of the groove-shaped bottom shell. The bolt hole can also be a structure in an electrical component with a shell or a base, as long as the length of the part of the shell or the base used to form the bolt hole is greater than the thickness of the cover plate and the thickness of the inner surface of the bolt hole.

[0030] In one embodiment, the bottom of a groove-shaped bottom shell includes multiple cooling channels, the multiple cooling channels are separated by a bolt hole, the multiple cooling channels are used to transmit coolant to cool at least one electrical component, and a through hole penetrates a cover plate along a first direction.

[0031] In the embodiment of the present application, the bottom of the groove of the groove-shaped bottom shell needs to be passed through with coolant. Since the through hole needs to penetrate the bottom of the groove of the groove-shaped bottom shell or one of the cover plate, if the through hole penetrates the bottom of the groove of the groove-shaped bottom shell, it may cause leakage of coolant. That is, when the bottom of the groove of the groove-shaped bottom shell includes multiple cooling channels, the cover plate includes a through hole, and one end of the bolt is fixed to the bottom of the groove of the groove-shaped bottom shell. The cooling channel and the bolt hole are arranged at intervals to avoid interference between the coolant and the bolt.

[0032] In one embodiment, along a first direction, one end of an annular elastic member faces a cover plate, a ratio of an outer diameter of one end of an annular elastic member to an inner diameter of one end of an annular elastic member is greater than or equal to 1.5, and a ratio of an outer diameter of one end of an annular elastic member to an inner diameter of one end of an annular elastic member is less than or equal to 3.5.

[0033] In the embodiment of the present application, the annular elastic member is a hollow annular cylinder, and the ratio of the outer diameter to the inner diameter of the annular elastic member can reflect the thickness of the annular elastic member along the radial direction of the annular elastic member. One end of the annular elastic member is used to interact with the cover plate, and the ratio of the outer diameter to the inner diameter of one end of the annular elastic member will affect the effect of the annular elastic member in adjusting the vibration frequency. Specifically, assuming that the compression rate of the annular elastic member remains unchanged each time the vibration frequency is adjusted, and only the ratio of the outer diameter to the inner diameter of one end of the annular elastic member is changed, if the ratio of the outer diameter to the inner diameter of one end of the annular elastic member is too small, the force that the cover plate needs to apply to the annular elastic member is too small, so that the reaction force of the annular elastic member on the cover plate is also too small, which will eventually limit the effect of adjusting the vibration frequency. The ratio of the outer diameter to the inner diameter of one end of the annular elastic member cannot be too large, otherwise it will cause the annular elastic member to be easily damaged. In addition, making the vibration frequency of the cover plate change too much does not meet the requirements of adjusting the vibration frequency.

[0034] In one embodiment, the ratio of the outer diameter of one end of an annular elastic member to the width of a cover plate along the width direction of a cover plate is greater than or equal to 0.03, and the ratio of the outer diameter of one end of an annular elastic member to the width of a cover plate along the width direction of a cover plate is less than or equal to 0.07.

[0035] In the embodiment of the present application, the ratio of the outer diameter of one end of the annular elastic member to the width of the cover plate will affect the effect of the annular elastic member in adjusting the vibration frequency. Specifically, assuming that the compression rate and the ratio of the inner and outer diameters of the annular elastic member remain unchanged each time the vibration frequency is adjusted, and only the ratio of the outer diameter of one end of the annular elastic member to the width of the cover plate is changed, if the ratio of the outer diameter of one end of the annular elastic member to the width of the cover plate is too small, the force that the cover plate needs to apply to the annular elastic member is too small, so that the reaction force of the annular elastic member on the cover plate is also too small, which will eventually limit the effect of adjusting the vibration frequency. The ratio of the outer diameter of one end of the annular elastic member to the width of the cover plate cannot be too large, otherwise it will cause the annular elastic member to be easily damaged. In addition, making the vibration frequency of the cover plate change too much does not meet the requirements of adjusting the vibration frequency.

[0036] In one embodiment, the Young's modulus of an annular elastic member is less than the Young's modulus of any one of a cover plate or a grooved bottom shell. The Shore hardness of an annular elastic member is greater than or equal to 30HA, and the Shore hardness of an annular elastic member is less than or equal to 60HA.

[0037] In the embodiments of the present application, Young's modulus refers to the ability to resist deformation. When the cover plate is subjected to vibration, since the Young's modulus of the annular elastic member is smaller than that of the cover plate and the grooved bottom shell, the annular elastic member is easily deformed, and the vibration energy is dissipated during the deformation process, so that the annular elastic member can not only adjust the vibration frequency, but also play a role in suppressing vibration.

[0038] In the embodiments of the present application, Shore hardness refers to the hardness measured by a Shore hardness tester, which is used to characterize the degree of compression deformation or the ability to resist puncture of the material. The Shore hardness of the annular elastic member will affect the effect of the annular elastic member in adjusting the vibration frequency. Specifically, if the Shore hardness of the annular elastic member is too large, the annular elastic member is difficult to deform, so that the change amplitude of the natural vibration frequency of one of the bottom of the groove or the cover plate of the groove-shaped bottom shell is too small, which is not conducive to the frequency avoidance of the on-board electrical device and other excitation sources. If the Shore hardness of the annular elastic member is too small, when the nut adjustment bolt moves along the first direction, the reaction force exerted by the annular elastic member on one of the bottom of the groove or the cover plate of the groove-shaped bottom shell is small, which will also affect the effect of adjusting the vibration frequency.

[0039] In one embodiment, a vibration damping assembly also includes a protective cover, which is mounted on an annular elastic member, and the distance between the protective cover and the bottom of a groove of a groove-shaped bottom shell or one of a cover plate along a first direction is greater than or equal to the distance between one end of an annular elastic member and the bottom of a groove of a groove-shaped bottom shell or one of a cover plate.

[0040] In the embodiment of the present application, when the bolt moves along the first direction, the ideal situation is that the annular elastic member also deforms only along the first direction. However, in reality, the deformation direction of the annular elastic member may deviate from the force direction. In order to alleviate the problem of the deformation of the annular elastic member deviating from the force direction, the embodiment of the present application sets a protective sleeve on the outer peripheral side of the annular elastic member to limit the deformation of the annular elastic member in directions other than the first direction, reduce the negative impact of the annular elastic member on the effect of the force applied by the cover plate, and avoid the irreversible deformation of the annular elastic member in other directions.

[0041] In an embodiment of the present application, during the deformation of the annular elastic member along the first direction, the distance between the protective sleeve and one of the bottom of the groove or the cover plate of the groove-shaped bottom shell is greater than or equal to the distance between the annular elastic member and one of the bottom of the groove or the cover plate of the groove-shaped bottom shell, that is, the annular elastic member is always closer to one of the bottom of the groove or the cover plate of the groove-shaped bottom shell relative to the protective sleeve, which facilitates the interaction between the annular elastic member and one of the bottom of the groove or the cover plate of the groove-shaped bottom shell, and avoids the protective sleeve from becoming the main component that exerts force on one of the bottom of the groove or the cover plate of the groove-shaped bottom shell.

[0042] In one embodiment, a vibration reduction assembly further includes a plate and a sleeve, wherein the plate and the sleeve are used to pass a bolt, wherein the plate and the sleeve are sequentially stacked between an annular elastic member and the bottom of a grooved bottom shell or a cover plate along a first direction, and the difference between the inner diameter of a sleeve and the diameter of a bolt is less than or equal to the difference between the inner diameter of an annular elastic member and the diameter of a bolt. The Young's modulus of a sleeve is greater than the Young's modulus of an annular elastic member. The outer diameter of a sleeve is less than the outer diameter of an annular elastic member, and the outer diameter of a plate is greater than the outer diameter of an annular elastic member and the outer diameter of a sleeve.

[0043] In the embodiment of the present application, along the first direction, one of the bottom of the groove or the cover of the groove-shaped bottom shell, the annular elastic member, the flat plate, the sleeve and the other of the bottom of the groove or the cover of the groove-shaped bottom shell are arranged in sequence, and the flat plate and the sleeve are also used to pass the bolt. The sleeve and the annular elastic member are sleeved on different parts of the bolt, and the sleeve and the annular elastic member play different roles on the bolt.

[0044] Specifically, since one end of the annular elastic member needs to move synchronously with the bolt, and the annular elastic member itself has elasticity, the annular elastic member should try to avoid direct contact with the bolt to reduce the resistance to the movement of the bolt and avoid interference with the deformation of the annular elastic member itself. The Young's modulus of the sleeve is greater than the Young's modulus of the annular elastic member, that is, the sleeve is less likely to deform than the annular elastic member. The role of the sleeve for the bolt is mainly to keep the bolt moving along the first direction and prevent the bolt from moving away from the first direction. Therefore, in the embodiment of the present application, in order to achieve different roles played by the sleeve and the annular elastic member on the bolt, the difference between the inner diameter of the sleeve and the diameter of the bolt is less than or equal to the difference between the inner diameter of the annular elastic member and the diameter of the bolt.

[0045] In the embodiment of the present application, the outer diameter of the sleeve is smaller than the outer diameter of the annular elastic part, indicating that the sleeve does not directly support the annular elastic part. The flat plate is stacked between the annular elastic part and the sleeve. The outer diameter of the flat plate is larger than the outer diameter of the annular elastic part and the outer diameter of the sleeve, thereby avoiding damage to the annular elastic part and helping to improve the stability of the overall structure of the vibration damping assembly.

[0046] In addition, the sleeve and the plate can also play a role in limiting the length of the annular elastic member. That is, the vibration reduction assembly includes the sleeve and the plate, so that the annular elastic member selected for the vibration reduction assembly cannot be too long, that is, the natural length of the annular elastic member is less than the distance between the bottom of the groove of the groove bottom shell and the cover plate. If the length of the annular elastic member is too large, the force required to adjust the compressed length of the annular elastic member will also increase, which will increase the difficulty of adjusting the vibration frequency.

[0047] In a second aspect, an embodiment of the present application provides a powertrain. The powertrain includes a motor, a reducer, and an on-board electrical device as described in any one of the embodiments of the first aspect, the on-board electrical device is used to transmit electrical energy to the motor through a plurality of electrical components, the motor is used to convert electrical energy into mechanical energy and transmit the mechanical energy to the reducer, and a groove bottom of a groove-shaped bottom shell is arranged adjacent to at least one of the motor or the reducer.

[0048] In the embodiment of the present application, the vehicle-mounted electrical device of the first aspect is applied to the powertrain, and the bottom of the groove of the groove-shaped bottom shell is closer to at least one of the motor or the reducer than the cover plate. Based on the positional relationship between the bottom of the groove of the groove-shaped bottom shell and the motor and the reducer, the cover plate is more suitable for opening a through hole to avoid negative impact on the motor or the reducer. Since the vibration frequency of the vehicle-mounted electrical device can be adjusted according to different excitation sources, the vibration reduction effect is excellent, which is conducive to ensuring the normal operation of various components in the powertrain and avoiding electrical failures caused by vibration.

[0049] In a third aspect, an embodiment of the present application provides a vehicle. The vehicle includes a frame, a battery pack, and a powertrain as described in the second aspect, wherein the frame is used to fix the battery pack and the powertrain, the battery pack is used to provide electrical energy to the motor through an on-board electrical device, the powertrain is used to drive the wheels of the vehicle, the on-board electrical device is arranged adjacent to at least one of the motor or the reducer in the direction of gravity, and the on-board electrical device is higher than at least one of the motor or the reducer in the direction of gravity.

[0050] In the embodiment of the present application, the powertrain of the second aspect is applied to a vehicle, and at least one of the motor or the reducer can provide stable support for the on-board electrical device, so that in the on-board electrical device, the force applied by the nut to one of the bottom of the groove or the cover plate of the grooved bottom shell can be further transmitted to at least one of the motor or the reducer through the annular elastic member, thereby improving the stability of the vibration frequency adjustment of the vibration damping component. The on-board electrical device in the powertrain can block the propagation of vibration in the powertrain, which is beneficial to improving the NVH performance of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0052] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0053] Figure 2 is a schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0054] Figure 3 is a cross-sectional view of a vehicle-mounted electrical device provided in an embodiment of the present application;

[0055] Figure 4 is another cross-sectional view of the vehicle-mounted electrical device provided in an embodiment of the present application;

[0056] Figure 5 It is a schematic diagram of the partial structure of the vehicle-mounted electrical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0058] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0059] NVH: The abbreviation of Noise, Vibration and Harshness, refers to noise, vibration and sound roughness, and is used to measure the design and manufacturing quality of automobiles.

[0060] Young's modulus: used to describe the ability of a solid material to resist deformation.

[0061] The natural vibration frequency of current on-board electrical devices is limited by the formed structure and is difficult to adjust repeatedly. The embodiment of the present application provides an on-board electrical device, which includes a cover plate, a groove-shaped bottom shell and a vibration reduction assembly. A cover plate and a groove bottom shell of a groove-shaped bottom shell are arranged in a stacked manner along a first direction. A cover plate and a groove-shaped bottom shell are used to enclose a receiving cavity, and a receiving cavity is used to receive multiple electrical components of the on-board electrical device.

[0062] A vibration reduction assembly is used to avoid the vibration frequency of an on-board electrical device from different excitation sources. A vibration reduction assembly includes a bolt, an annular elastic member and a nut. The bottom of a groove of a groove-shaped bottom shell or one of a cover plate includes a through hole. A bolt extends into a receiving cavity through a through hole along a first direction. The length of a bolt along the first direction is greater than the spacing between a cover plate and the bottom of a groove of a groove-shaped bottom shell, so that one end of the bolt is fixed to the bottom of a groove of a groove-shaped bottom shell or the other of a cover plate, and the other end of the bolt can be exposed in a receiving cavity. The two ends of an annular elastic member are arranged between the bottom of a groove of a groove-shaped bottom shell and a cover plate along the first direction. An annular elastic member is sleeved on a bolt. The bottom of a groove of a groove-shaped bottom shell or one of a cover plate is used to put an annular elastic member in a compressed state, and the bottom of a groove of a groove-shaped bottom shell or one of a cover plate and the annular elastic member exert a force on each other. A nut is used to engage the other end of a bolt to adjust the compressed length of an annular elastic member along a first direction, so as to change the natural vibration frequency of the vehicle-mounted electrical device.

[0063] The embodiment of the present application can repeatedly adjust the natural vibration frequency of the cover plate of the vehicle-mounted electrical device through the cooperation of the vibration reduction component with the bottom of the groove-shaped bottom shell and the cover plate, so as to achieve frequency avoidance between the vehicle-mounted electrical device and different excitation sources, which is conducive to alleviating the resonance problem and improving the vibration reduction and noise reduction performance of the vehicle-mounted electrical device. The vehicle-mounted electrical device provided in the embodiment of the present application can be applied to a powertrain, and the powertrain containing the vehicle-mounted electrical device of the present application can be applied to a vehicle.

[0064] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. In the embodiment of the present application, vehicle 1 refers to a wheeled device driven or towed by a power device. In the embodiment of the present application, vehicle 1 includes a frame 20, a battery pack 30 and a powertrain 10. Among them, the frame 20 is the structural skeleton of the vehicle 1, and the frame 20 is used to fix the battery pack 30 and the powertrain 10, and can bear the internal and external environmental loads of the vehicle 1. The battery pack 30 is used to supply power to the powertrain 10, and the battery pack 30 can also be called a power battery. The powertrain 10 is the power source of the vehicle 1, and the powertrain 10 is used to drive the wheels 40 of the vehicle 1.

[0065] See also Figure 2 , Figure 2 The schematic diagram of the structure of the powertrain 10 provided in the embodiment of the present application. In the embodiment of the present application, the powertrain 10 includes an on-board electrical device 100, a motor 200 and a reducer 300. The motor 200 is used to convert electrical energy into mechanical energy, and the motor 200 is connected to the reducer 300 to drive the wheels 40 to rotate. It should be noted that Figure 2 The structure of the on-board electrical device 100 in the powertrain 10 is only schematically shown, and does not represent its specific size and shape.

[0066] In one embodiment, the vehicle-mounted electrical device 100 includes at least one of a motor controller, a vehicle-mounted charger, or a vehicle-mounted power distribution device. The motor controller is used to convert the direct current transmitted by the battery pack into alternating current, and transmit the alternating current to the motor. The vehicle-mounted charger is used to receive electrical energy from an external power source and charge the battery pack. The vehicle-mounted power distribution device is used to distribute the electrical energy output by the battery pack to the load of the vehicle.

[0067] Among them, the motor controller, the on-board charger and the on-board power distribution device all involve the use of electrical components to realize the function of AC-DC conversion or power conversion. Exemplarily, the electrical components include a capacitor module and a power module. The capacitor module is electrically connected between the battery pack and the power module. The capacitor module can smooth the voltage, reduce the inductance parameters and weaken the peak voltage. The power module refers to a combination of power electronic devices that can realize the power conversion function. The power electronic devices include at least one of an insulated gate bipolar transistor (IGBT), a silicon carbide power tube, a silicon tube, a metal-oxide semiconductor field-effect transistor (MOSFET) and a diode.

[0068] During the driving process of the vehicle, the motor and reducer will transmit vibration to the on-board electrical device. If the natural vibration frequency of the on-board electrical device cannot be repeatedly adjusted according to the vibration frequency of the excitation source, the on-board electrical device is easily excited by different vibrations and resonates, which will radiate noise externally and interfere with the electrical connection of electrical components internally, causing negative impact on the normal operation of the on-board electrical device and powertrain.

[0069] The embodiment of the present application improves the structure of the on-board electrical device and can repeatedly adjust the natural vibration frequency of the on-board electrical device according to actual needs to achieve frequency avoidance between the on-board electrical device and different excitation sources, thereby enhancing the performance of vibration reduction and noise reduction and alleviating the NVH problem of the vehicle.

[0070] See also Figures 3 to 5 , Figure 3 A cross-sectional view of a vehicle-mounted electrical device provided in an embodiment of the present application, Figure 4 Another cross-sectional view of the vehicle-mounted electrical device provided in an embodiment of the present application, Figure 5 This is a schematic diagram of a partial structure of a vehicle-mounted electrical device provided in an embodiment of the present application. Figure 3 and Figure 4 Some hatching is omitted.

[0071] like Figure 3 As shown, the vehicle-mounted electrical device 100 includes a cover plate 120, a groove-shaped bottom shell 130 and a vibration reduction assembly 110. The cover plate 120 and the groove bottom 131 of the groove-shaped bottom shell 130 are stacked along the first direction A. The cover plate 120 and the groove-shaped bottom shell 130 are used to enclose a receiving cavity 140, and the receiving cavity 140 is used to receive a plurality of electrical components 150 of the vehicle-mounted electrical device 100. Figures 3 to 5As shown, one of a trough bottom 131 of a trough bottom shell 130 or a cover plate 120 includes a through hole 101 .

[0072] like Figure 3 As shown, a vibration reduction assembly 110 includes a bolt 111, an annular elastic member 112 and a nut 113. A bolt 111 passes through a through hole 101 and extends into an accommodating cavity 140 along a first direction A, and a length of a bolt 111 along the first direction A is greater than a distance between a cover plate 120 and a groove bottom 131 of a groove-shaped bottom shell 130. One end of a bolt 111 is fixed to the groove bottom 131 of a groove-shaped bottom shell 130 or a cover plate 120, and the other end of a bolt 111 is exposed in an accommodating cavity 140.

[0073] like Figure 3 and Figure 4 As shown, along the first direction A, two ends of an annular elastic member 112 are arranged between a groove bottom 131 of a groove bottom shell 130 and a cover plate 120. An annular elastic member 112 is sleeved on a bolt 111. One of the groove bottom 131 of a groove bottom shell 130 and a cover plate 120 is used to put an annular elastic member 112 in a compressed state.

[0074] Combination Figure 3 and Figure 4 As shown, a nut 113 is used to engage the other end of a bolt 111 to adjust the compressed length of an annular elastic member 112 along the first direction A.

[0075] In the embodiment of the present application, for the convenience of expression, one of the groove bottom 131 of the groove-shaped bottom shell 130 or the cover plate 120 is recorded as the first structure, and the other of the groove bottom 131 of the groove-shaped bottom shell 130 or the cover plate 120 is recorded as the second structure, that is, the first structure includes the through hole 101, and the second structure is fixed to one end of the bolt 111.

[0076] In an embodiment of the present application, the vehicle-mounted electrical device 100 will be subjected to vibrations from the motor and the reducer. When the natural vibration frequency of the vehicle-mounted electrical device 100 is close to the excitation frequency of the motor and the reducer, the vehicle-mounted electrical device 100 will resonate. Therefore, it is necessary to increase the difference in vibration frequency between the vehicle-mounted electrical device 100 and the motor and the reducer to avoid the harm caused by resonance. However, the excitation frequency of the motor and the reducer is not fixed, and the excitation frequencies of different structures in the motor and the reducer are also different. If only the cover plate 120 or the grooved bottom shell 130 is structurally improved, the effect of the change in the natural vibration frequency is limited by the already formed structure, and it cannot be adjusted multiple times according to actual needs, which will reduce the adaptability of the vehicle-mounted electrical device 100 to different excitation frequencies.

[0077] To solve the above problems, the embodiment of the present application realizes rapid and flexible adjustment of the natural vibration frequency of the vehicle-mounted electrical device 100 by cooperating a vibration reduction assembly 110 with the groove bottom 131 of the groove-shaped bottom shell 130 and the cover plate 120 .

[0078] In the embodiment of the present application, the vibration reduction assembly 110 includes a bolt 111 and a nut 113. One end of the bolt 111 extends from the through hole 101 of the first structure into the accommodating cavity 140 and is then fixed to the second structure. The length of the bolt 111 along the first direction A is greater than the distance between the groove bottom 131 of the groove-shaped bottom shell 130 and the cover plate 120, so that the other end of the bolt 111 is exposed in the accommodating cavity 140. The nut 113 is engaged with the other end of the bolt 111, and the nut 113 can drive one end of the bolt 111 to move. It should be noted that one end of the bolt 111 is fixed to the second structure, which does not mean that the bolt 111 cannot move relative to the second structure. The fixing of one end of the bolt 111 to the second structure means that when the movement of the bolt 111 relative to the second structure ends, one end of the bolt 111 can remain fixed to the second structure.

[0079] The vibration reduction assembly 110 also includes an annular elastic member 112, which is sleeved on the portion of the bolt 111 located in the accommodating cavity 140. The first structure applies a force to the annular elastic member 112 to compress the annular elastic member 112. Correspondingly, the annular elastic member 112 also applies a reaction force to the first structure. The natural vibration frequency is an inherent property of the vibration system and is related to the mass and stiffness of the system. The annular elastic member 112 applies a reaction force to the first structure, which is equivalent to reducing the effective mass of the first structure participating in the vibration, thereby being able to change the vibration frequency of the first structure.

[0080] In the embodiment of the present application, the vibration frequency of the first structure can be repeatedly adjusted multiple times through the cooperation between the annular elastic member 112 and the bolt 111 and the nut 113.

[0081] Specifically, the nut 113 changes the spacing between the first structure and the second structure by adjusting the relative position between one end of the bolt 111 and the second structure, thereby changing the compressed length of the annular elastic member 112. It can be understood that the interaction between the annular elastic member 112 and the first structure is related to the compressed length of the annular elastic member 112. By adjusting the compressed length of the annular elastic member 112, the natural vibration frequency of the first structure can also be changed, that is, the natural vibration frequency of the first structure will not be limited to a fixed value by its own structure. In actual application scenarios, the natural vibration frequency of the on-board electrical device 100 can be adjusted accordingly according to the vibration frequency of the excitation source, reducing the risk of resonance and improving the NVH performance of the entire vehicle. In addition, the other ends of the nut 113 and the bolt 111 are exposed to the accommodating cavity 140, which is conducive to reducing the difficulty of adjusting the vibration frequency.

[0082] It should be noted that, in order to clearly illustrate the vibration reduction assembly 110 of the embodiment of the present application, Figure 3 and Figure 4 The vibration reduction assembly 110 and the structures in the cover plate 120 and the grooved bottom shell 130 that cooperate with the vibration reduction assembly 110 are magnified, and do not represent their actual sizes and positional relationships. Figure 4 The deformation of the middle cover plate 120 is also to match the effect shown schematically by the enlarged vibration reduction assembly 110. In actual applications, the deformation degree of the cover plate 120 is not limited to Figure 4 The structure shown.

[0083] Please continue reading Figure 3 and Figure 4 In one embodiment, a nut 113 rotates to drive a bolt 111 to move along a first direction A, so as to apply a force to one of a groove bottom 131 of a groove bottom shell 130 and a cover plate 120. One of the groove bottom 131 of a groove bottom shell 130 and a cover plate 120 is used to transmit the force applied by a nut 113 to an annular elastic member 112, so that one end of an annular elastic member 112 moves relative to the other of the groove bottom 131 of a groove bottom shell 130 and a cover plate 120 along the first direction A, and one end of an annular elastic member 112 moves toward one of the groove bottom 131 of a groove bottom shell 130 and a cover plate 120 along the first direction A.

[0084] In the embodiment of the present application, the nut 113 is engaged with the other end of the bolt 111, and the rotation of the nut 113 can drive the bolt 111 to move along the first direction A. During the movement of the bolt 111 along the first direction A, the first structure is used to transmit the force applied by the nut 113 to the annular elastic member 112, so that the annular elastic member 112 moves toward one end of the first structure following the bolt 111. After the movement of the annular elastic member 112 is completed, the annular elastic member 112 is structurally manifested as a change in the compressed length, and functionally manifested as a change in the reaction force on the first structure.

[0085] In one embodiment, during the movement of a bolt 111 along a first direction A, the compression rate of an annular elastic member 112 is greater than 0, the compression rate of an annular elastic member 112 is less than or equal to 70%, and the compression rate of an annular elastic member 112 along the first direction A is the ratio of the difference between the natural length of an annular elastic member 112 and the compressed length of the annular elastic member 112 to the natural length of the annular elastic member 112.

[0086] In the embodiment of the present application, the ability of the annular elastic member 112 to adjust the vibration frequency of the first structure is positively correlated with the compression rate of the annular elastic member 112 itself. However, the compression rate of the annular elastic member 112 cannot be too large, otherwise it will easily cause the annular elastic member 112 to break and fail. The embodiment of the present application can take into account both the effect of the change in the vibration frequency of the first structure and the service life of the annular elastic member 112. In addition, the cooperation between the bolt 111, the nut 113 and the annular elastic member 112 allows the compression rate of the annular elastic member 112 to vary within a certain range, so that the vibration frequency of the first structure can be adjusted according to the actual scenario, which is beneficial to improving the adaptability of the vehicle-mounted electrical device 100 to different application scenarios or different excitation sources in the same application scenario. It can be understood that Figure 3 The compression rate of the annular elastic member 112 is greater than Figure 4 The compression rate of the annular elastic member 112 is shown.

[0087] In one embodiment, the ratio of the natural length of an annular elastic member 112 along the first direction A to the distance between a groove bottom 131 of a groove bottom shell 130 and a cover plate 120 is greater than or equal to 0.1.

[0088] In the embodiment of the present application, the compression rate of the annular elastic member 112 is greater than 0 and less than or equal to 70%. When the natural length of the annular elastic member 112 is larger, the deformation of the annular elastic member 112 in the vehicle-mounted electrical device 100 is larger, so that the adjustable range of the vibration frequency of the first structure is also increased. The present application controls the ratio of the natural length of the annular elastic member 112 to the spacing between the groove bottom 131 of the groove-shaped bottom shell 130 and the cover plate 120 to be greater than or equal to 0.1, which is conducive to improving the adaptability of the first structure of the vehicle-mounted electrical device 100 to excitation sources of different frequencies.

[0089] Please continue reading Figure 3 and Figure 5 In one embodiment, the ratio of the distance between the center of a through hole 101 and the center of the groove bottom 131 of a groove bottom shell 130 or a cover plate 120 along the width direction B of one of the groove bottom 131 of a groove bottom shell 130 or a cover plate 120 to the width of one of the groove bottom 131 of a groove bottom shell 130 or a cover plate 120 is less than or equal to 0.2. The ratio of the distance between the center of a through hole 101 and the center of the groove bottom 131 of a groove bottom shell 130 or a cover plate 120 to the length of one of the groove bottom 131 of a groove bottom shell 130 or a cover plate 120 along the length direction C of one of the groove bottom 131 of a groove bottom shell 130 or a cover plate 120 is less than or equal to 0.2.

[0090] In the embodiment of the present application, the bolt 111 passes through the through hole 101 and the annular elastic member 112 in sequence along the first direction A, and the position of the center of the through hole 101 determines the position of the bolt 111 and the annular elastic member 112 in the vehicle-mounted electrical device 100. The through hole 101 is located at one of the groove bottom 131 of a groove-shaped bottom shell 130 or a cover plate 120, and the position of the through hole 101 at one of the groove bottom 131 of a groove-shaped bottom shell 130 or a cover plate 120 will affect the effect of the bolt 111 and the annular elastic member 112 in adjusting the vibration frequency.

[0091] Specifically, taking the through hole 101 located on the cover plate 120 as an example, the cover plate 120 of the vehicle-mounted electrical device 100 is usually a thin plate structure, and the first-order vibration mode of the thin plate structure shows the characteristics that the amplitude is the largest at the center and the amplitude decreases radially from the center to the edge. If the center of the through hole 101 is far away from the center of the cover plate 120, the amplitude of the area where the through hole 101 is located is smaller than the amplitude of the center of the cover plate 120, which is not conducive to the bolt 111 and the annular elastic member 112 to play the role of adjusting the vibration frequency of the cover plate 120.

[0092] In the embodiment of the present application, by shortening the distance between the through hole 101 and the bottom 131 of a groove-shaped bottom shell 130 or the center of one of the cover plates 120, the load-bearing area with the largest amplitude in the bottom 131 of a groove-shaped bottom shell 130 or one of the cover plates 120 is reduced, which can effectively increase the vibration frequency of the vehicle-mounted electrical device 100, achieve frequency avoidance between the vehicle-mounted electrical device 100 and the excitation source, and alleviate the resonance problem.

[0093] It is worth mentioning that the through hole 101 in the embodiment of the present application is different from the fixing hole 103 of the cover plate 120 and the groove-shaped bottom shell 130. The fixing holes 103 of the cover plate 120 and the groove-shaped bottom shell 130 are used to achieve a fixed connection between the cover plate 120 and the groove-shaped bottom shell 130, so the fixing holes 103 of the cover plate 120 and the groove-shaped bottom shell 130 need to be arranged adjacent to each other so that the mounting surfaces of the cover plate 120 and the groove-shaped bottom shell 130 are in contact. In addition, after the fixing member is fixed to the fixing hole 103, it is usually not repeatedly adjusted many times to avoid a negative impact on the connection strength between the cover plate 120 and the groove-shaped bottom shell 130. However, the through hole 101 in the present application needs to accommodate at least the annular elastic member 112 between the second structure along the first direction A, and the through hole 101 and the second structure are arranged at intervals. During the process of adjusting the vibration frequency, the bolt 111 also needs to move along the first direction A driven by the nut 113. Since the through hole 101 is different from the fixing hole 103 and does not play a fixing role, the movement of the bolt 111 along the first direction A will not affect the connection stability between the cover plate 120 and the grooved bottom shell 130.

[0094] Please continue reading Figure 3In one embodiment, the inner diameter of an annular elastic member 112 is greater than the diameter of a bolt 111. In the embodiment of the present application, the bolt 111 passes through the annular elastic member 112, and the annular elastic member 112 and the bolt 111 move synchronously along the first direction A. The inner surface of the annular elastic member 112 is spaced from the bolt 111, which can reduce the friction between the annular elastic member 112 and the bolt 111, and is conducive to extending the service life of the annular elastic member 112.

[0095] Please continue reading Figure 3 and Figure 4 In one embodiment, a vibration damping assembly 110 further includes a protective cover 114, and the protective cover 114 is sleeved on an annular elastic member 112, and the distance between the protective cover 114 and the first structure along the first direction A is greater than or equal to the distance between one end of the annular elastic member 112 and the first structure.

[0096] In the embodiment of the present application, when the bolt 111 moves along the first direction A, the ideal situation is that the annular elastic member 112 also deforms only along the first direction A. However, in reality, the deformation direction of the annular elastic member 112 may also deviate from the force direction. For example, the annular elastic member 112 deforms in the radial direction of the annular elastic member 112. In order to alleviate the problem of the deformation of the annular elastic member 112 deviating from the force direction, the embodiment of the present application is provided with a protective cover 114 on the outer peripheral side of the annular elastic member 112 to limit the deformation of the annular elastic member 112 in directions other than the first direction A, reduce the negative impact of the annular elastic member 112 on the effect of the force applied by the cover plate 120, and avoid the irreversible deformation of the annular elastic member 112 in other directions. In one embodiment, the protective cover 114 is elastic.

[0097] In the embodiment of the present application, during the deformation of the annular elastic member 112 along the first direction A, the distance between the protective cover 114 and the first structure is greater than or equal to the distance between the annular elastic member 112 and the first structure, that is, the annular elastic member 112 is always closer to the first structure relative to the protective cover 114, which facilitates the interaction between the annular elastic member 112 and the first structure and avoids the protective cover 114 from becoming the main component interacting with the first structure.

[0098] Please continue reading Figure 3In one embodiment, a vibration reduction assembly 110 further includes a plate 115 and a sleeve 116, and the plate 115 and the sleeve 116 are used to pass through a bolt 111. In the first direction A, the plate 115 and the sleeve 116 are sequentially stacked between an annular elastic member 112 and the groove bottom 131 of a groove bottom shell 130 or a cover plate 120. The difference between the inner diameter of a sleeve 116 and the diameter of a bolt 111 is less than or equal to the difference between the inner diameter of an annular elastic member 112 and the diameter of a bolt 111, and the Young's modulus of a sleeve 116 is greater than the Young's modulus of an annular elastic member 112.

[0099] In the embodiment of the present application, for the convenience of description, a flat plate 115 is recorded as a flat plate 115a. Along the first direction A, the first structure, the annular elastic member 112, the flat plate 115a, the sleeve 116 and the second structure are arranged in sequence, and the flat plate 115a and the sleeve 116 are also used to pass the bolt 111. Among them, the sleeve 116 and the annular elastic member 112 are sleeved on different parts of the bolt 111, and the sleeve 116 and the annular elastic member 112 play different roles for the bolt 111.

[0100] Specifically, since one end of the annular elastic member 112 needs to move synchronously with the bolt 111 and the annular elastic member 112 itself has elasticity, the annular elastic member 112 should avoid direct contact with the bolt 111 as much as possible to reduce the resistance to the movement of the bolt 111 and avoid interference with the deformation of the annular elastic member 112. The Young's modulus of the sleeve 116 is greater than that of the annular elastic member 112, that is, the sleeve 116 is less likely to deform than the annular elastic member 112. The role of the sleeve 116 for the bolt 111 is mainly to keep the bolt 111 moving along the first direction A and prevent the bolt 111 from deviating from the first direction A.

[0101] Therefore, in the embodiment of the present application, in order to realize the different roles played by the sleeve 116 and the annular elastic member 112 on the bolt 111, the difference between the inner diameter of the sleeve 116 and the diameter of the bolt 111 is less than or equal to the difference between the inner diameter of the annular elastic member 112 and the diameter of the bolt 111. In one embodiment, the outer diameter of the flat plate 115a is greater than the outer diameter of the protective cover 114, and the end of the protective cover 114 facing the second structure is fixed to the flat plate 115a. In the embodiment of the present application, the flat plate 115a also supports the protective cover 114, which is conducive to the protective cover 114 to stably play the role of maintaining the deformation direction of the annular elastic member 112.

[0102] like Figure 3As shown, the outer diameter of a sleeve 116 is smaller than the outer diameter of an annular elastic member 112, and the outer diameter of a flat plate 115a is larger than the outer diameter of an annular elastic member 112 and the outer diameter of a sleeve 116. In the embodiment of the present application, the outer diameter of the sleeve 116 is smaller than the outer diameter of the annular elastic member 112, the flat plate 115a is stacked between the annular elastic member 112 and the sleeve 116, the sleeve 116 does not directly support the annular elastic member 112, and the outer diameter of the flat plate 115a is larger than the outer diameter of the annular elastic member 112 and the outer diameter of the sleeve 116, so as to avoid damage to the annular elastic member 112 and help improve the stability of the overall structure of the vibration reduction assembly 110.

[0103] In addition, the sleeve 116 and the plate 115a can also play a role in limiting the length of the annular elastic member 112. That is, the vibration reduction assembly 110 includes the sleeve 116 and the plate 115a, so that the annular elastic member 112 selected by the vibration reduction assembly 110 cannot be too long, that is, the natural length of the annular elastic member 112 is less than the distance between the groove bottom 131 of the groove bottom shell 130 and the cover plate 120. If the length of the annular elastic member 112 is too large, the force required to adjust the compressed length of the annular elastic member 112 will also increase, which will increase the difficulty of adjusting the vibration frequency.

[0104] In one embodiment, one end of a bolt 111 is used to engage with the inner surface of a bolt hole 102, and the bolt 111 is used to move relative to the inner surface of the bolt hole 102 along the first direction A. The length of the inner surface of the bolt hole 102 along the first direction A is greater than the maximum difference between the compressed length and the natural length of an annular elastic member 112.

[0105] In the embodiment of the present application, by adjusting the bolt 111 to move along the first direction A relative to the inner surface of the bolt hole 102, the distance between the cover plate 120 and the groove bottom 131 of the groove bottom shell 130 can be increased or decreased. After one end of the bolt 111 passes through the through hole 101, it is threadedly connected to the inner surface of the bolt hole 102. The friction between the inner surface of the bolt hole 102 and the bolt 111 can ensure that after the operation of adjusting the bolt 111 is completed, one end of the bolt 111 is fixed in the bolt hole 102, that is, the bolt 111 maintains a fixed connection relationship with the second structure. Therefore, one end of the bolt 111 needs to be always connected to the bolt hole 102, and the moving space of one end of the bolt 111 should be limited in the bolt hole 102, so as to keep the adjusted vibration frequency stable. In the embodiment of the present application, the height of the inner surface of the bolt hole 102 along the first direction A is greater than the maximum difference between the compressed length and the natural length of the annular elastic member 112, that is, when the compression rate of the annular elastic member 112 changes from 0% to 70%, one end of the bolt 111 is always located in the bolt hole 102.

[0106] In one embodiment, the length of the bolt 111 along the first direction A is greater than the minimum spacing between the through hole 101 and the bolt hole 102. In the embodiment of the present application, the adjustment of the vibration frequency needs to be achieved by moving the bolt 111 along the first direction A. In order to ensure that one end of the bolt 111 is always located in the bolt hole 102 during the movement of the bolt 111, the length of the bolt 111 along the first direction A needs to be greater than the minimum spacing between the through hole 101 and the bolt hole 102. Among them, the minimum spacing between the through hole 101 and the bolt hole 102 refers to the spacing between the two openings of the through hole 101 and the bolt hole 102 that are opposite to each other along the first direction A. If the length of the bolt 111 along the first direction A is less than or equal to the minimum spacing between the through hole 101 and the bolt hole 102, although the bolt 111 can still move along the first direction A, after the movement is completed, one end of the bolt 111 cannot be fixed to the bolt hole 102. In this case, the effect of the bolt 111 in adjusting the vibration frequency of the cover plate 120 also becomes unstable.

[0107] Please continue reading Figure 3 In one embodiment, the groove bottom 131 of a groove-shaped bottom shell 130 includes a protrusion 1311, the protrusion direction of the protrusion 1311 is toward a cover plate 120 along the first direction A, the length of the protrusion 1311 along the first direction A is greater than the thickness of the cover plate 120, the opening of a bolt hole 102 is located at one end of the protrusion 1311 facing the cover plate 120, and the length of the inner surface of the bolt hole 102 along the first direction A is less than the length of the protrusion 1311.

[0108] In the embodiment of the present application, the length of the protrusion 1311 along the first direction A is greater than the thickness of the cover plate 120, so that the protrusion 1311 is more suitable for opening the bolt hole 102 than the cover plate 120, so that the length of the inner surface of the bolt hole 102 along the first direction A can meet the movement requirements of the bolt 111. Since the inner surface of the bolt hole 102 is used to engage with one end of the bolt 111, the bolt hole 102 is formed in the groove bottom 131 of the groove-shaped bottom shell 130, which is equivalent to fixing one end of the bolt 111 to the groove bottom 131 of the groove-shaped bottom shell 130. That is, when the length of the protrusion 1311 is greater than the thickness of the cover plate 120, the first structure is the cover plate 120, and the second structure is the groove bottom 131 of the groove-shaped bottom shell 130.

[0109] In the embodiment of the present application, one end of the protrusion 1311 faces the cover plate 120 along the first direction A, the opening of the bolt hole 102 is located at one end of the protrusion 1311, and the bolt 111 extends from the through hole 101 of the cover plate 120 into the bolt hole 102 of the groove bottom 131 of the groove bottom shell 130 along the first direction A. The nut 113 applies a force to the cover plate 120, and the cover plate 120 transmits the force applied by the nut 113 to the annular elastic member 112, and one end of the annular elastic member 112 moves relative to the groove bottom 131 of the groove bottom shell 130 along the first direction A. In one embodiment, the protrusion 1311 is integrally formed with the groove bottom 131 of the groove bottom shell 130, or the protrusion 1311 is fixedly connected to the groove bottom 131 of the groove bottom shell 130. In one embodiment, the length of the protrusion 1311 along the first direction A is greater than the average thickness of the groove bottom 131 of the groove bottom shell 130 except the protrusion 1311. The embodiment of the present application avoids opening the bolt holes 102 in the thinner portion of the groove bottom 131 of the groove bottom shell 130 , which is beneficial to improving the structural strength of the groove bottom shell 130 .

[0110] Please continue reading Figure 3 In one embodiment, a vibration reduction assembly 110 further includes two other plates 115, and the other two plates 115 are used to pass through the bolt 111. One of the other two plates 115 is stacked between the cover plate 120 and the annular elastic member 112, and the other of the other two plates 115 is stacked between the sleeve 116 and the protrusion 1311. For the convenience of distinction, the plate 115 stacked between the cover plate 120 and the annular elastic member 112 is recorded as plate 115b, and the plate 115 stacked between the sleeve 116 and the protrusion 1311 is recorded as plate 115c. Among them, the plate 115b is adjacent to the through hole 101, and the plate 115b is used to reduce the difficulty of the bolt 111 to perform a spiral motion along the first direction A. The plate 115c includes an annular groove, and the annular groove is used to engage and fix with the sleeve 116 to improve the structural stability of the sleeve 116.

[0111] In one embodiment, the shell of an electrical component is fixed to the groove bottom 131 of a groove-shaped bottom shell 130, the length of the shell of the electrical component along the first direction A is greater than the thickness of a cover plate 120, the opening of a bolt hole 102 is located on the surface of the shell of the electrical component facing the cover plate 120, and the length of the inner surface of the bolt hole 102 along the first direction A is less than the length of the shell of the electrical component.

[0112] In the embodiment of the present application, the bolt hole 102 is not limited to being formed in the groove bottom 131 of the groove bottom shell 130. The bolt hole 102 can also be a structure in an electrical component with a shell or a base, as long as the length of the portion of the shell or the base used to form the bolt hole 102 is greater than the thickness of the cover plate 120 and the thickness of the inner surface of the bolt hole 102. Exemplarily, in one embodiment, the electrical component includes a capacitor module, the shell of the capacitor module is fixed to the groove bottom 131 of the groove bottom shell 130, and the shell of the capacitor module includes a bolt hole 102. Among them, the capacitor module is used to transmit direct current and adjust direct current.

[0113] Please continue reading Figure 2 In one embodiment, the bottom 131 of a groove-shaped bottom shell 130 is arranged adjacent to at least one of the motor or the reducer. In the embodiment of the present application, the bottom 131 of the groove-shaped bottom shell 130 is closer to at least one of the motor or the reducer than the cover plate 120. Since the through hole 101 needs to pass through the first structure, based on the positional relationship between the bottom 131 of the groove-shaped bottom shell 130 and the motor and the reducer, the cover plate 120 is more suitable as the first structure to avoid negative impact on the motor or the reducer. In addition, if the through hole 101 is opened at the bottom 131 of the groove-shaped bottom shell 130, the nut is located on the side of the bottom 131 of the groove-shaped bottom shell 130 facing the motor or the reducer, and it is more difficult to adjust the nut.

[0114] In one embodiment, the on-board electrical device is arranged adjacent to at least one of the motor or the reducer in the direction of gravity, and the on-board electrical device is higher than at least one of the motor or the reducer in the direction of gravity.

[0115] In an embodiment of the present application, when the vehicle-mounted electrical device is applied in a vehicle scenario, the vehicle-mounted electrical device is arranged adjacent to at least one of the motors or reducers along the direction of gravity, and at least one of the motors or reducers can provide stable support for the vehicle-mounted electrical device, so that in the vehicle-mounted electrical device, the force applied by the nut to the first structure can continue to be transmitted to at least one of the motors or reducers through the annular elastic member, thereby improving the stability of the vibration frequency adjustment of the vibration damping assembly.

[0116] In one embodiment, a groove bottom 131 of a groove-shaped bottom shell 130 includes a plurality of cooling channels, the plurality of cooling channels are spaced apart from a bolt hole 102, the plurality of cooling channels are used to transmit coolant to cool at least one electrical component 150, and a through hole 101 passes through a cover plate 120 along a first direction A.

[0117] In the embodiment of the present application, the bottom 131 of the grooved bottom shell 130 needs to be filled with coolant. Since the through hole 101 needs to pass through the first structure, if the bottom 131 of the grooved bottom shell 130 is the first structure, leakage of coolant may occur. That is, when the bottom 131 of the grooved bottom shell 130 includes multiple cooling channels, the first structure is the cover plate 120, and the second structure is the bottom 131 of the grooved bottom shell 130. The cooling channels and the bolt holes 102 are arranged at intervals to avoid interference between the coolant and the bolts 111.

[0118] In one embodiment, along the first direction A, one end of an annular elastic member 112 faces a cover plate 120, and the ratio of the outer diameter of one end of an annular elastic member 112 to the inner diameter of one end of an annular elastic member 112 is greater than or equal to 1.5, and the ratio of the outer diameter of one end of an annular elastic member 112 to the inner diameter of one end of an annular elastic member 112 is less than or equal to 3.5.

[0119] In the embodiment of the present application, the annular elastic member 112 is a hollow annular cylinder, and the ratio of the outer diameter to the inner diameter of the annular elastic member 112 can reflect the thickness of the annular elastic member 112 along the radial direction of the annular elastic member 112. One end of the annular elastic member 112 is used to interact with the cover plate 120, and the ratio of the outer diameter to the inner diameter of one end of the annular elastic member 112 will affect the effect of the annular elastic member 112 in adjusting the vibration frequency. Specifically, assuming that the compression rate of the annular elastic member 112 remains unchanged each time the vibration frequency is adjusted, and only the ratio of the outer diameter to the inner diameter of one end of the annular elastic member 112 is changed, if the ratio of the outer diameter to the inner diameter of one end of the annular elastic member 112 is too small, the force that the cover plate 120 needs to apply to the annular elastic member 112 is too small, so that the reaction force of the annular elastic member 112 on the cover plate 120 is also too small, which will eventually limit the effect of adjusting the vibration frequency. The ratio of the outer diameter to the inner diameter of one end of the annular elastic member 112 cannot be too large, otherwise the annular elastic member 112 may be easily damaged. In addition, the vibration frequency of the cover plate 120 may vary too much and does not meet the requirements of adjusting the vibration frequency.

[0120] In one embodiment, the ratio of the outer diameter of one end of an annular elastic member 112 to the width of a cover plate 120 along the width direction B of a cover plate 120 is greater than or equal to 0.03, and the ratio of the outer diameter of one end of an annular elastic member 112 to the width of a cover plate 120 along the width direction B of a cover plate 120 is less than or equal to 0.07.

[0121] In the embodiment of the present application, the ratio of the outer diameter of one end of the annular elastic member 112 to the width of the cover plate 120 will affect the effect of the annular elastic member 112 in adjusting the vibration frequency. Specifically, assuming that the compression rate and the ratio of the inner and outer diameters of the annular elastic member 112 remain unchanged each time the vibration frequency is adjusted, and only the ratio of the outer diameter of one end of the annular elastic member 112 to the width of the cover plate 120 is changed, if the ratio of the outer diameter of one end of the annular elastic member 112 to the width of the cover plate 120 is too small, the force that the cover plate 120 needs to apply to the annular elastic member 112 is too small, so that the reaction force F of the annular elastic member 112 on the cover plate 120 is also too small, which will eventually limit the effect of adjusting the vibration frequency. The ratio of the outer diameter of one end of the annular elastic member 112 to the width of the cover plate 120 cannot be too large, otherwise it will cause the annular elastic member 112 to be easily damaged. In addition, the vibration frequency of the cover plate 120 changes too much and does not meet the requirements of adjusting the vibration frequency.

[0122] In one embodiment, the Young's modulus of an annular elastic member 112 is less than the Young's modulus of any one of a cover plate 120 or a grooved bottom shell 130. The Shore hardness of an annular elastic member 112 is greater than or equal to 30HA, and the Shore hardness of an annular elastic member 112 is less than or equal to 60HA.

[0123] In the embodiment of the present application, Young's modulus refers to the ability to resist deformation. When the cover plate 120 is vibrated, the annular elastic member 112 is easily deformed because the Young's modulus of the annular elastic member 112 is smaller than that of the cover plate 120 and the grooved bottom shell 130. The energy of the vibration is dissipated during the deformation process, so that the annular elastic member 112 can not only adjust the vibration frequency, but also play a role in suppressing vibration. Exemplarily, the annular elastic member 112 is made of rubber.

[0124] In the embodiment of the present application, the Shore hardness refers to the hardness measured by a Shore hardness tester, which is used to characterize the degree of compression deformation or the ability to resist puncture of the material. The Shore hardness of the annular elastic member 112 will affect the effect of the annular elastic member 112 in adjusting the vibration frequency. Specifically, if the Shore hardness of the annular elastic member 112 is too large, the annular elastic member 112 is difficult to deform, so that the change amplitude of the natural vibration frequency of the first structure is too small, which is not conducive to the frequency avoidance between the on-board electrical device 100 and other excitation sources. If the Shore hardness of the annular elastic member 112 is too small, when the nut 113 adjusts the bolt 111 to move along the first direction A, the reaction force applied by the annular elastic member 112 to the first structure is small, which will also affect the effect of adjusting the vibration frequency.

[0125] It should be noted that the annular elastic member 112 may not meet the above requirements on Young's modulus and Shore hardness, as long as the annular elastic member 112 is elastic. In one embodiment, the annular elastic member 112 is a spring.

[0126] The above is a detailed introduction to the on-board electrical device, powertrain and vehicle provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those of ordinary skill in the art, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A vehicle-mounted electrical device, characterized in that: The vehicle-mounted electrical device comprises a cover plate, a groove-shaped bottom shell and a vibration damping assembly, wherein the cover plate and the groove bottom of the groove-shaped bottom shell are arranged in a stacked manner along a first direction, the cover plate and the groove-shaped bottom shell are used to enclose a receiving cavity, and the receiving cavity is used to receive a plurality of electrical components of the vehicle-mounted electrical device, and one of the groove bottom of the groove-shaped bottom shell or the cover plate comprises a through hole, and the vibration damping assembly comprises: a bolt, wherein the bolt passes through the through hole and extends into the accommodating cavity along the first direction, the length of the bolt along the first direction is greater than the distance between the cover plate and the bottom of the groove of the groove-shaped bottom shell, one end of the bolt is fixed to the other of the bottom of the groove of the groove-shaped bottom shell or the cover plate, and the other end of the bolt is exposed in the accommodating cavity; an annular elastic member, wherein two ends of the annular elastic member are arranged between the bottom of the groove-shaped bottom shell and the cover plate along the first direction, and the annular elastic member is sleeved on the bolt; A nut is used to engage with the one end of the bolt to adjust the compressed length of the annular elastic member along the first direction.

2. The vehicle-mounted electrical device according to claim 1, characterized in that: The rotation of the nut drives the bolt to move along the first direction, so as to apply a force to the bottom of the groove of the groove-shaped bottom shell or the cover plate; The bottom of the groove of the groove-shaped bottom shell or the one of the cover plates is used to transmit the force applied by the nut to the annular elastic member, so that one end of the annular elastic member moves relative to the bottom of the groove of the groove-shaped bottom shell or the other of the cover plates along the first direction, and the one end of the annular elastic member moves toward the bottom of the groove of the groove-shaped bottom shell or the one of the cover plates along the first direction.

3. The vehicle-mounted electrical device according to claim 2, characterized in that: During the movement of the bolt along the first direction, the compression rate of the annular elastic member is greater than 0, the compression rate of the annular elastic member is less than or equal to 70%, and the compression rate of the annular elastic member along the first direction is the ratio of the difference between the natural length of the annular elastic member and the compressed length of the annular elastic member to the natural length of the annular elastic member.

4. The vehicle-mounted electrical device according to claim 3, characterized in that: The ratio of the natural length of the annular elastic member along the first direction to the distance between the groove bottom of the groove-shaped bottom shell and the cover plate is greater than or equal to 0.

1.

5. The vehicle-mounted electrical device according to claim 1, characterized in that: A ratio of a distance between a center of the through hole and a center of the groove bottom of the groove bottom shell or the groove bottom of the groove bottom shell or the groove bottom of the groove bottom shell along a width direction of the groove bottom shell or the groove bottom of the groove bottom shell or the groove bottom of the groove bottom shell or the groove bottom of the groove bottom shell is less than or equal to 0.2; Along the length direction of the groove bottom of the groove-shaped bottom shell or the one of the cover plates, the ratio of the distance between the center of the through hole and the center of the groove bottom of the groove-shaped bottom shell or the one of the cover plates to the length of the groove bottom of the groove-shaped bottom shell or the one of the cover plates is less than or equal to 0.

2.

6. The vehicle-mounted electrical device according to any one of claims 1 to 5, characterized in that: The one end of the one bolt is used to engage with the inner surface of a bolt hole, and the one bolt is used to move relative to the inner surface of the one bolt hole along the first direction; The length of the inner surface of the bolt hole along the first direction is greater than the maximum difference between the compressed length and the natural length of the annular elastic member.

7. The vehicle-mounted electrical device according to claim 6, characterized in that: The groove bottom of the groove-shaped bottom shell includes a protrusion, the protrusion direction of the protrusion along the first direction faces the cover plate, the length of the protrusion along the first direction is greater than the thickness of the cover plate, the opening of the bolt hole is located at one end of the protrusion facing the cover plate, and the length of the inner surface of the bolt hole along the first direction is less than the length of the protrusion; or, The shell of the electrical component is fixed to the bottom of the groove of the groove-shaped bottom shell, the length of the shell of the electrical component along the first direction is greater than the thickness of the cover plate, the opening of the bolt hole is located on the surface of the shell of the electrical component facing the cover plate, and the length of the inner surface of the bolt hole along the first direction is less than the length of the shell of the electrical component.

8. The vehicle-mounted electrical device according to claim 6, characterized in that: The bottom of the groove of the groove-shaped bottom shell includes a plurality of cooling channels, the plurality of cooling channels are spaced apart from the bolt hole, the plurality of cooling channels are used to transmit coolant to cool at least one of the electrical components, and the through hole passes through the cover plate along the first direction.

9. The vehicle-mounted electrical device according to claim 7 or 8, characterized in that: One end of the annular elastic member is toward the cover plate along the first direction, and the ratio of the outer diameter of the one end of the annular elastic member to the inner diameter of the one end of the annular elastic member is greater than or equal to 1.5, and the ratio of the outer diameter of the one end of the annular elastic member to the inner diameter of the one end of the annular elastic member is less than or equal to 3.

5.

10. The vehicle-mounted electrical device according to claim 9, characterized in that: The ratio of the outer diameter of one end of the annular elastic member along the width direction of the cover plate to the width of the cover plate is greater than or equal to 0.03, and the ratio of the outer diameter of one end of the annular elastic member along the width direction of the cover plate to the width of the cover plate is less than or equal to 0.

07.

11. The vehicle-mounted electrical device according to any one of claims 1 to 5, characterized in that: The Young's modulus of the annular elastic member is smaller than the Young's modulus of any one of the cover plate and the grooved bottom shell; The Shore hardness of the annular elastic member is greater than or equal to 30HA, and the Shore hardness of the annular elastic member is less than or equal to 60HA.

12. The vehicle-mounted electrical device according to any one of claims 1 to 5, characterized in that: The vibration damping assembly also includes a protective cover, which is sleeved on the annular elastic member, and the distance between the protective cover and the bottom of the groove of the groove-shaped bottom shell or one of the cover plates along the first direction is greater than or equal to the distance between one end of the annular elastic member and the bottom of the groove of the groove-shaped bottom shell or one of the cover plates.

13. The vehicle-mounted electrical device according to any one of claims 1 to 5, characterized in that: The vibration reduction assembly further comprises a plate and a sleeve, wherein the plate and the sleeve are used to pass through the bolt, wherein: The one flat plate and the one sleeve are sequentially stacked between the one annular elastic member and the groove bottom of the one groove-shaped bottom shell or the other of the one cover plate along the first direction, the difference between the inner diameter of the one sleeve and the diameter of the one bolt is less than or equal to the difference between the inner diameter of the one annular elastic member and the diameter of the one bolt, and the Young's modulus of the one sleeve is greater than the Young's modulus of the one annular elastic member; The outer diameter of the sleeve is smaller than the outer diameter of the annular elastic member, and the outer diameter of the flat plate is larger than the outer diameters of the annular elastic member and the outer diameters of the sleeve.

14. A powertrain, characterized in that: The powertrain includes a motor, a reducer and an on-board electrical device as described in any one of claims 1 to 13, wherein the on-board electrical device is used to transmit electrical energy to the motor through the multiple electrical components, and the motor is used to convert the electrical energy into mechanical energy and transmit the mechanical energy to the reducer, and the bottom of the groove of the groove-shaped bottom shell is arranged adjacent to at least one of the motor or the reducer.

15. A vehicle, characterized in that: The vehicle includes a frame, a battery pack and a powertrain as described in claim 14, wherein the frame is used to fix the battery pack and the powertrain, the battery pack is used to provide electrical energy to the motor through the on-board electrical device, and the powertrain is used to drive the wheels of the vehicle, and the on-board electrical device is arranged adjacent to at least one of the motor or the reducer in the direction of gravity, and the on-board electrical device is higher than at least one of the motor or the reducer in the direction of gravity.

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