Flexible output device for electric machines

Abstract

The application discloses a flexible output device of a motor, which comprises a base, an intermediate cavity, a disc spring and an upper cover. The base is internally provided with a center boss, and the center boss is provided with a center shaft; a spring cavity is arranged on the circumferential side of the center boss, and a buffer spring set is arranged in the spring cavity. The intermediate cavity is matched with the buffer spring set after penetrating through the center shaft, so that flexible transmission between the base and the intermediate cavity is realized. A damping cavity is further arranged in the intermediate cavity, and the disc spring is embedded in the damping cavity after penetrating through the center shaft; the upper cover is locked and fixed through a self-locking nut after penetrating through the center shaft, so that the disc spring is fixed in the damping cavity. The base is provided with a motor bolt hole connected with a motor transmission shaft, and the end face of the intermediate cavity is provided with a transmission bolt hole connected with a vehicle transmission shaft, so that flexible output of the motor is realized. The application is a pure mechanical structure and is more reliable, and on the premise of guaranteeing motor power, the torque change in the whole flexible buffer process is more linear and delicate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicle driving technology, and more particularly, to a motor flexible output device. BACKGROUND

[0002] New energy vehicles use motors for driving, and rigid transmission connection is usually adopted between the motor output shaft and the wheels. Compared with traditional internal combustion engines, the motor has fast torque response, large peak torque, and can also recycle sliding energy. However, while these features of the motor bring advantages, they also bring problems such as strong sudden acceleration of the vehicle, large torque impact during electric and power generation state switching, and difficult to overcome torque shock and vibration problems. These problems may affect the driving comfort, and if the torque impact is too large, it may also cause life risk to the parts of the transmission system.

[0003] The prior art mainly adjusts the motor calibration parameters to weaken the torque variation rate and the negative impact of the torque mutation, and uses relatively more complex active damping control and additional torque compensation means to weaken the impact of the torque shock and vibration problem.

[0004] However, the fast torque response speed of the motor is one of the obvious advantages of the motor, and by adjusting the motor calibration to weaken the torque loading rate, the sudden acceleration is weakened, and the original advantage of the motor is also abandoned. In addition, the software simulates the flexible loading curve and the active damping control, and the software calibration is difficult. The existing technology is basically a pure software measure, and the reliability is relatively poor. Moreover, the more complex the control strategy is, the greater the probability of bug occurrence is.

[0005] Therefore, how to provide a mechanical structure to eliminate the torque mutation impact and torque shock and vibration of the motor has become a technical problem to be solved in the field. SUMMARY

[0006] The purpose of the present application is to provide a motor flexible output device, which is more reliable in pure mechanical structure, and the torque change is more linear and delicate during the entire flexible buffering process while ensuring the power of the motor.

[0007] According to one aspect of the present application, a motor flexible output device is provided, which comprises a base, an intermediate cavity, a disc spring and an upper cover.

[0008] The base is provided with a center boss, and the center boss is provided with a center shaft. A spring cavity is arranged on the circumferential side of the center boss, and a buffer spring group is arranged in the spring cavity.

[0009] The intermediate cavity is matched with the buffer spring group after passing through the center shaft, so as to realize the flexible transmission between the base and the intermediate cavity.

[0010] The intermediate cavity is further provided with a damping cavity, and the disc spring is embedded in the damping cavity after passing through the central shaft; and the upper cover is locked and fixed by a self-locking nut after passing through the central shaft, so as to fix the disc spring in the damping cavity.

[0011] The base is provided with a motor bolt hole connected with a motor transmission shaft, and the end surface of the intermediate cavity is provided with a transmission bolt hole connected with a vehicle transmission shaft, so as to realize flexible output of the motor.

[0012] Optionally, the motor flexible output device according to the application, the motor bolt hole is a plurality of, with the central shaft as the center, annular array between the spring cavity and the central boss.

[0013] Optionally, the motor flexible output device according to the application, the inner side of the spring cavity is provided with a group of symmetrical limit blocks, the buffer spring group includes two buffer springs, and the two ends of the buffer spring are provided with spring sliding blocks, and the spring sliding blocks are respectively in contact with the limit blocks.

[0014] Optionally, the motor flexible output device according to the application, the end surface of the intermediate cavity facing the base is further provided with symmetrical clamping claws, the clamping claws are matched with the spring sliding blocks respectively, and when the motor drives the base to rotate, the clamping claws can compress the buffer spring through the spring sliding blocks.

[0015] Optionally, the motor flexible output device according to the application, the first damping sheet is further provided between the base and the intermediate cavity, the first damping sheet is provided with a first damping sheet central hole through which the central shaft passes, and a clamping claw hole through which the clamping claw passes.

[0016] Optionally, the motor flexible output device according to the application, the first damping sheet is further provided with a plurality of lightening holes, and the lightening holes are annularly arranged around the first damping sheet central hole.

[0017] Optionally, the motor flexible output device according to the application, the second damping sheet is further provided between the disc spring and the upper cover, the second damping sheet is provided with a second damping sheet central hole through which the central shaft passes, and the second damping sheet is arranged in close contact with the disc spring.

[0018] Optionally, the motor flexible output device according to the application, the end of the central shaft is provided with a limiting gap, the upper cover central hole of the upper cover is matched with the limiting gap, so as to ensure that the upper cover rotates with the base and drives the intermediate cavity to rotate through the disc spring.

[0019] Optionally, the motor flexible output device, the outer side wall of the intermediate cavity is provided with a plurality of arc-shaped protrusions, and the arc-shaped protrusions are provided with the transmission bolt holes.

[0020] Optionally, the motor flexible output device, the arc-shaped protrusions are arranged in a ring array on the outer side wall of the intermediate cavity.

[0021] The motor flexible output device mainly relies on the elastic force of the spring and the friction force of the damping sheet to flexibly process the sudden change process of the motor output torque, prevents the driving discomfort caused by motor torsional shock and vibration, and the risk of damage to parts caused by too large torque impact. The mechanical structure is used to prevent the torque sudden impact and vibration of the motor, which is more reliable and stable than software program control, and the calibration difficulty of the motor can be obviously simplified. The torque loading curve does not need to be flexibly calibrated too finely, and the program bug risk caused by complex calibration is also prevented.

[0022] Other features and advantages of the present application will become apparent from the following detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0024] Figure 1 A cross-sectional view of the motor flexible output device disclosed by the present application;

[0025] Figure 2 A front view of the base disclosed by the present application;

[0026] Figure 3 A top view of the base disclosed by the present application;

[0027] Figure 4 A structural schematic view of the buffer spring set disclosed by the present application;

[0028] Figure 5 A structural schematic view of the first damping sheet disclosed by the present application;

[0029] Figure 6 A front view of the intermediate cavity disclosed by the present application;

[0030] Figure 7 A top view of the intermediate cavity disclosed by the present application;

[0031] Figure 8 A front view of the disc spring disclosed by the present application;

[0032] Figure 9 Top view of the disc spring disclosed by the present application;

[0033] Figure 10 Front view of the second damping sheet disclosed by the present application;

[0034] Figure 11 Top view of the second damping sheet disclosed by the present application;

[0035] Figure 12 Structural schematic diagram of the upper cover disclosed by the present application;

[0036] Figure 13 Overall schematic diagram of the motor flexible output device disclosed by the present application.

[0037] BRIEF DESCRIPTION OF DRAWINGS 1 - base; 1.1 - spring cavity; 1.2 - limiting block; 1.3 - motor bolt hole; 1.4 - center boss; 1.5 - center shaft; 1.6 - limiting notch; 2 - buffer spring group; 2.1 - buffer spring; 2.2 - spring sliding block; 3 - first damping sheet; 3.1 - claw hole; 3.2 - weight-reducing hole; 3.3 - first damping sheet central hole; 4 - intermediate cavity; 4.1 - claw; 4.2 - transmission bolt hole; 4.3 - intermediate cavity central hole; 4.4 - damping cavity; 5 - disc spring; 5.1 - disc spring central hole; 5.2 - upper end face; 5.3 - lower end face; 6 - second damping sheet; 6.1 - friction surface; 6.2 - second damping sheet central hole; 7 - upper cover; 7.1 - upper cover central hole; 8 - self-locking nut. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0039] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application, its application, or uses.

[0040] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus should be considered as part of the description.

[0041] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0042] It should be noted that like reference numerals and letters refer to like items in the several views, and that no further discussion on the same will be undertaken in the subsequent views, once an item has been defined in one view.

[0043] According to Figures 1 to 13 As shown in the figure, a flexible output device of motor includes a base 1, an intermediate cavity 4, a disc spring 5 and an upper cover 7.

[0044] The base 1 is provided with a center boss 1.4, and the center boss 1.4 is provided with a center shaft 1.5. A spring cavity 1.1 is arranged on the circumferential side of the center boss 1.4, and the spring cavity 1.1 is provided with a buffer spring set 2. The buffer spring set 2 is pressed into the spring cavity 1.1, and the torque value provided by the pre-pressing force of the buffer spring set 2 and the torque value provided when pressing can be flexibly set according to the actual motor performance and buffering requirements.

[0045] The intermediate cavity 4 is provided with an intermediate cavity central shaft hole 4.3 for the center shaft 1.5 to pass through, which cooperates with the buffer spring set 2 after passing through the center shaft 1.5 to realize flexible transmission between the base 1 and the intermediate cavity 4.

[0046] The intermediate cavity 4 is further provided with a damping cavity 4.4, and the disc spring 5 is in an umbrella-shaped structure and is provided with a disc spring central shaft hole 5.1 for the center shaft 1.5 to pass through. After passing through the center shaft 1.5, it is embedded in the damping cavity 4.4, and the lower end surface 5.3 is in contact with the end surface of the damping cavity 4.4. The upper cover 7 is provided with an upper cover central shaft hole 7.1 for the center shaft 1.5 to pass through, which is locked and fixed by a self-locking nut 8 after passing through the center shaft 1.5 to fix the disc spring 5 in the damping cavity 4.4.

[0047] The base 1 is provided with a motor bolt hole 1.3 connected with the motor transmission shaft, and the end surface of the intermediate cavity 4 is provided with a transmission bolt hole 4.2 connected with the vehicle transmission shaft to realize the flexible output of the motor. The base 1 is fixed on the motor output shaft through the motor bolt hole 1.3.

[0048] Further, the motor bolt hole 1.3 is a plurality of, which is arranged in a circular array around the center shaft 1.5 between the spring cavity 1.1 and the center boss 1.4 to ensure the stable connection between the motor transmission shaft and the base 1.

[0049] Further, the inner side of the spring cavity 1.1 is provided with a set of symmetrical limiting blocks 1.2, and the buffer spring set 2 includes two buffer springs 2.1, both ends of the buffer spring 2.1 are provided with spring sliding blocks 2.2, and the spring sliding blocks 2.2 are respectively in contact with the limiting blocks 1.2. In the implementation, the symmetrical limiting blocks 1.2 divide the spring cavity 1.1 into two symmetrical half-cavity structures, and the two buffer springs 2.1 are respectively clamped in the half-cavities between the two ends of the limiting blocks 1.2. The limiting blocks 1.2 can limit the position of the buffer spring 2.1 to prevent it from moving randomly, and the limiting blocks 1.2 can leave a gap between the spring sliding blocks 2.2 of the two buffer springs 2.1 to allow the insertion of the middle cavity 4.

[0050] Further, the end surface of the middle cavity 4 facing the base 1 is also provided with symmetrical clamping claws 4.1, which cooperate with the spring sliding blocks 2.2. When the motor drives the base 1 to rotate, the clamping claws 4.1 can compress the buffer spring 2.1 through the spring sliding blocks 2.2.

[0051] Further, the first damping sheet 3 is also provided between the base 1 and the middle cavity 4, and the first damping sheet 3 is provided with a first damping sheet shaft hole 3.3 for the center shaft 1.5 to pass through, and a clamping claw hole 3.1 for the clamping claw 4.1 to pass through. The contact surface between the first damping sheet 3 and the base 1 is pre-coated with lubricating grease to ensure stable friction coefficient, weaken friction noise and prolong service life.

[0052] Further, the first damping sheet 3 is also provided with a plurality of weight reduction holes 3.2, which are arranged in a circular array around the first damping sheet shaft hole 3.3. The weight reduction holes 3.2 can reduce the overall weight of the invention to reduce the load of the motor drive shaft driving the invention to rotate.

[0053] Further, the second damping sheet 6 is also provided between the disc spring 5 and the upper cover 7, and the second damping sheet 6 is provided with a second damping sheet shaft hole for the center shaft 1.5 to pass through, and the second damping sheet 6 is arranged in close contact with the disc spring 5. The center shaft 1.5 passes through the second damping sheet shaft hole 6.2, and the upper end surface 5.2 of the disc spring 5 is in close contact with the damping sheet bottom surface. The contact surface between the second damping sheet 6 and the upper cover 7 is pre-coated with lubricating grease to ensure stable friction coefficient, weaken friction noise and prolong service life. In addition, the side of the second damping sheet 6 facing the upper cover 7 is provided with a friction surface 6.1 to improve the friction coefficient between the upper cover 7 and the second damping sheet 6.

[0054] Further, the end of the central shaft 1.5 is provided with a limiting gap 1.6, and the upper cover 7 is provided with a shaft hole in the upper cover 7, which is matched with the limiting gap 1.6, so as to ensure that the upper cover 7 rotates with the base 1 and drives the intermediate cavity 4 to rotate through the disc spring 5. After being locked by the self-locking nut 8, the upper cover 7 is pressed to a set position, so as to ensure that the disc spring 5 has appropriate elastic force to ensure damping, and the damping value is generally set to be 40% to 60% of the torque provided by the pre-pressing force of the buffer spring set 2.

[0055] Further, the outer side wall of the intermediate cavity 4 is provided with a plurality of arc-shaped protrusions, and the arc-shaped protrusions are all provided with transmission bolt holes 4.2. The arc-shaped protrusions are centered on the axis of the intermediate cavity 4 and are arranged in a ring array on the outer side wall of the intermediate cavity 4, so as to ensure the stable connection between the vehicle transmission shaft and the intermediate cavity 4.

[0056] The arrangement position of the application is located between the output shaft of the motor and the transmission shaft of the vehicle, and the rigid connection between the original motor output shaft and the vehicle transmission shaft is changed into a flexible connection. The base 1 is connected with the motor transmission shaft through the motor bolt hole 1.3, and the intermediate cavity 4 is connected with the vehicle transmission shaft through the transmission bolt hole 4.2 of the upper end surface 5.2. When the motor torque suddenly changes or torsional vibration occurs, the transmission shaft and the motor appear to be out of position due to the difference in speed, at which time the two clamping jaws 4.1 at the lower part of the intermediate cavity 4 will drive the buffer spring set 2, and the clamping jaws 4.1 and the damping cavity 4.4 will also drive the first damping sheet 3 and the second damping sheet 6 to rotate, respectively, so that the two damping sheets slide relative to the base 1 and the upper cover 7, respectively, to play a buffering role. In the process of spring compression and speed difference expansion, the damping force and the spring elastic force jointly resist the speed difference, and in the process of spring rebound and speed difference reduction, the damping force reversely weakens the spring rebound force, so that the entire buffering process is more gentle, and the existence of the damping structure can well absorb the torsional vibration energy and eliminate the harmonic vibration caused by the repeated vibration of the spring.

[0057] The base 1, the intermediate cavity 4, the upper cover 7, the self-locking nut 8 and the like can be made of die-cast aluminum or stainless steel according to the different torque requirements; the first damping sheet 3 and the second damping sheet 6 are made of 30% glass fiber reinforced PA46 material.

[0058] Although some specific embodiments of the application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A flexible output device for a motor, characterized in that, Includes a base, a middle cavity, a disc spring, and a top cover; The base has a central boss, and a central shaft is provided on the central boss; a spring cavity is provided on the periphery of the central boss, and a buffer spring assembly is provided in the spring cavity; The intermediate cavity passes through the central shaft and then cooperates with the buffer spring assembly to achieve flexible transmission between the base and the intermediate cavity; The intermediate cavity is further provided with a damping cavity, and the disc spring is embedded in the damping cavity after passing through the central shaft; the upper cover passes through the central shaft and is locked and fixed by a self-locking nut to fix the disc spring in the damping cavity; The base is provided with motor bolt holes for connecting to the motor drive shaft, and the end face of the intermediate cavity is provided with transmission bolt holes for connecting to the vehicle drive shaft, so as to realize the flexible output of the motor. The inner side of the spring cavity is provided with a set of symmetrical limiting blocks. The buffer spring group includes two buffer springs. Both ends of the buffer springs are provided with spring sliders, and the spring sliders respectively abut against the limiting blocks. The intermediate cavity is also provided with symmetrical claws on the end face facing the base. The claws cooperate with the spring slider. When the motor drives the base to rotate, the claws can compress the buffer spring through the spring slider. A first damping plate is also provided between the base and the intermediate cavity. The first damping plate has a first damping plate central shaft hole for the central shaft to pass through, and a claw hole for the claw to pass through. A second damping plate is provided between the disc spring and the upper cover. The second damping plate has a central hole for the central shaft to pass through. The edge of the second damping plate is fitted to the edge of the disc spring.

2. The flexible output device for a motor according to claim 1, characterized in that, The motor has multiple bolt holes, arranged in a ring around the central axis between the spring cavity and the central boss.

3. The flexible output device for a motor according to claim 1, characterized in that, The first damping plate is also provided with a plurality of weight reduction holes, which are arranged in a ring array with the central shaft hole of the first damping plate as the center.

4. The flexible output device for a motor according to claim 1, characterized in that, The end of the central shaft is provided with a limiting notch, and the central shaft hole of the upper cover matches the limiting notch to ensure that the upper cover rotates with the base and drives the intermediate cavity to rotate through the disc spring.

5. The flexible output device for a motor according to claim 1, characterized in that, The outer wall of the intermediate cavity is provided with multiple arc-shaped protrusions, and each arc-shaped protrusion is provided with a transmission bolt hole.

6. The flexible output device for a motor according to claim 5, characterized in that, The arc-shaped protrusions are arranged in a ring around the axis of the intermediate cavity on the outer wall of the intermediate cavity.

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