An integrated electric drive device

Abstract

The present invention provides an integrated electric drive device, which includes a control module, a stator assembly, a rotor assembly, a reduction component, a buffer component and a housing. The rotor is sleeved outside the stator assembly. The rotor shaft penetrates through the axial center line of the stator assembly and extends outside the stator assembly. The rotor shaft is fixedly connected to the rotor. The reduction component includes a screw rod, a helical gear and an output connecting piece. The screw rod is fixedly sleeved on the rotor shaft. The helical gear meshes with the screw rod. The output connecting piece covers the helical gear. The above components are housed in the housing, and the housing is the shell of the integrally formed integrated electric drive device. The present invention is an integrated electric drive device with small volume, light weight, high power density, good precision and low noise, and has wide application value.

Description

Technical Field

[0001] The present invention relates to a driving device, and particularly to an integrated electric driving device. Background Art

[0002] The energy source of an electric driving device is simple, the speed change range is large, the efficiency is high, the speed and position accuracy are high, and it is generally connected to a reduction device, and is widely used in mechanical automation products. In existing electric driving devices, most are brushed DC motors, with simple control, but low power, and are mostly used in low-precision and low-power robot systems. In some narrow working environments, it is necessary to make the volume of the driving device as small as possible, and at the same time, it is required to have higher precision and larger power. Existing electric driving devices are generally assembled from motors, reduction mechanisms, brakes, couplings, etc. The assembled electric driving device has not been optimized in terms of volume and weight, and there is great room for improvement in increasing the power density. On the other hand, the motor will generate certain noise and electromagnetic interference during operation, and reducing noise and electromagnetic interference is also a performance that the driving device urgently needs to improve. Therefore, it is very valuable to develop an electric driving device with small volume, light weight, high power density, good precision, and low noise. Summary of the Invention

[0003] The present invention provides an integrated electric driving device with small volume, light weight, high power density, good precision, and low noise. The stator assembly, rotor assembly, reduction component, and buffer component are integrated into one body, effectively improving the power density of the electric driving device, and having wide application value.

[0004] The present invention realizes the above object through the following technical solutions:

[0005] An integrated electric driving device, comprising: a stator assembly, the stator assembly is connected to a control module through a power line and a control line, and the control module is used to control the power output of the electric driving device; a rotor assembly, including a rotor and a rotor shaft, the rotor is sleeved outside the stator assembly and rotates around the stator assembly, the rotor shaft penetrates through the axial center line of the stator assembly and extends outside the stator assembly, the rotor shaft and the stator assembly are supported by a front bearing, and the rotor shaft is fixedly connected to the rotor; a reduction component, including a screw, a helical gear, an output connecting member and an output shaft, the screw is fixedly sleeved on one end of the rotor shaft away from the stator assembly, the helical gear meshes with the screw, the output connecting member is fixedly connected or elastically connected to the end face of the helical gear, the output shaft is fixedly connected to the output connecting member, and the center line of the output shaft coincides with the axial center line of the helical gear; a box body, which is the basic component of the integrated electric driving device, the stator assembly is fixedly connected to the box body, and the helical gear, the output connecting member and the box body are rotationally connected.

[0006] Further, the deceleration component further includes a buffer component, which is clamped between the helical gear and the output connecting member and is elastically connected to the helical gear and the output connecting member respectively.

[0007] Further, a plurality of adjusting springs are arranged perpendicular to the surface of the output connecting member. One end of each adjusting spring is fixedly connected to the output connecting member, and the other end elastically contacts the helical gear. The tooth groove width of the helical gear gradually increases from top to bottom.

[0008] Further, a plurality of adjusting springs are arranged perpendicular to the surface of the output connecting member. One end of each adjusting spring is fixedly connected to the output connecting member, and the other end elastically contacts the helical gear. The tooth groove width e satisfies: Δe = -2·tgα·m·Δx, where x is the modification coefficient, α is the pressure angle, m is the module, Δe is the tooth groove change amount, and Δx is the modification coefficient change amount.

[0009] Further, a plurality of spring clamping posts are evenly arranged inside the helical gear. The number of spring clamping posts is the same as that of the adjusting springs, and the adjusting springs are embedded into the spring clamping posts.

[0010] Further, a rear bearing is sleeved on one end of the rotor shaft extending out of the stator assembly, and the outside of the rear bearing is fixed on the inner wall of the box body.

[0011] Further, an output shaft mounting hole is provided at the center of the output connecting member. An output shaft is provided perpendicular to the surface of the output connecting member and fixed on the output shaft mounting hole. The profile on the output shaft matches the output shaft mounting hole.

[0012] Further, an output bearing is mounted on the output shaft to support the output shaft on the inner wall of the box body.

[0013] Further, the buffer component is embedded into the helical gear and matches the contact surfaces of the output connecting member and the helical gear. After installation, the upper surfaces of the output connecting member and the helical gear are on the same horizontal plane.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. The integrated electric drive device of the present application integrates functions such as large reduction ratio deceleration, buffer component vibration reduction, reverse braking of the screw and the helical gear, and electric drive. It has a compact structure and high power density.

[0016] 2. The present application adopts the combination of a screw and a helical gear. Due to the separability of gear transmission, the manufacturing difficulty is reduced and the interchangeability is good.

[0017] 3. A buffer component is added inside the helical gear, replacing the coupling of the existing electric drive device. On the one hand, it can absorb the impact during the startup, stop, and operation of the device, ensuring the smoothness of operation. On the other hand, since the buffer component is embedded in the helical gear, it will not increase the volume of the integrated electric drive device.

[0018] 4. The reverse braking function of the screw and the helical gear can ensure that the electric drive device realizes the load position holding function after power-off, ensuring the safety and reliability of the work.

[0019] 5. In this application, the tooth grooves of the helical gear are designed as variable tooth grooves, the screw remains unchanged, and the transmission device can automatically compensate for the clearance after partial wear, becoming a backlash-free transmission.

[0020] 6. Compared with the prior art where the inner hole of the helical gear contacts the box body with a large friction coefficient, in this application, the inner hole of the helical gear directly contacts the output shaft, and the output shaft is supported on the box body through bearings, with a small friction coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural schematic diagram of the integrated electric drive device according to Embodiment 1 of the present invention;

[0022] Figure 2 is the sectional view of the integrated electric drive device according to Embodiment 1 of the present invention;

[0023] Figure 3 is the sectional view of the screw and helical gear transmission according to Embodiment 1 of the present invention;

[0024] Figure 4 is the structural schematic diagram of the box body of the integrated electric drive device of the present invention;

[0025] Figure 5 is the exploded view of the integrated electric drive device according to Embodiment 2 of the present invention;

[0026] Figure 6 is the exploded view of the integrated electric drive device according to Embodiment 3 of the present invention;

[0027] Figure 7 is the structural schematic diagram of the helical gear according to Embodiment 3 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] Embodiment 1

[0030] Figure 1This is a schematic diagram of the overall structure of an integrated electric drive device according to this embodiment, including a control module 9, a stator assembly 1, a rotor assembly 2, a reduction component 3, a buffer component 4, and a housing 5. Among them, the control module is connected to the stator assembly through a power line 91 and a control line 92, and controls the power output of the electric drive device through a control board 93; the stator assembly includes winding coils, and the commutating brushes used to alternately change the electromagnetic field are removed. A brushed motor will friction the carbon brushes, causing losses, and the carbon brushes need to be replaced regularly. The on-off alternation between the carbon brushes and the coil terminals will generate electric sparks, resulting in electromagnetic breakdown and interfering with electronic devices. This application uses a brushless DC motor as the power output device. The brushless motor removes the brushes, and there are no electric sparks generated during the operation of the brushed motor, thus greatly reducing the interference of electric sparks to the remote control radio equipment.

[0031] The rotor assembly 2 includes a rotor 21 and a rotor shaft 22. The rotor is sleeved outside the stator assembly and rotates around the stator assembly. The rotor includes a housing and permanent magnet steel. The permanent magnet steel is evenly distributed on the inner side wall of the housing. The housing is an uncovered hollow cylindrical small box, and is sleeved outside the stator assembly through the uncovered end. A rotor shaft mounting hole is provided at the center of the other bottom surface. The rotor shaft passes through the rotor shaft mounting hole, so that the rotor shaft is axially arranged on the center line of the stator assembly, and the rotor shaft is sleeved into the front bearing 61 and tightly fitted with the bearing. The other end extends outside the stator assembly, and the rotor shaft is tightly fitted with the rotor housing.

[0032] The reduction component 3 includes a screw 31, a helical gear 32, and an output connecting piece 33. The screw is sleeved on one end of the rotor shaft extending outside the stator assembly. The helical gear meshes with the screw. The output connecting piece is fixedly covered on the helical gear. The helical gear, the output connecting piece, and the buffer component are tightly fitted with each other and have no relative movement after installation. The buffer component is embedded inside the helical gear, and its shape matches the inside of the helical gear, so that the surfaces of the helical gear and the output connecting piece cannot directly contact. Most of the vibration caused by the rotation of the helical gear is absorbed by the buffer component, which can effectively reduce vibration and noise. An installation through hole 331 is provided at the center of the output connecting piece for fixing the output shaft 8 on the output connecting piece. The profile of the output shaft matches the installation through hole. The rotation of the output connecting piece drives the output shaft to rotate synchronously for outputting the reduced rotational force.

[0033] The buffer component 4 is clamped between the helical gear and the output connecting piece, so that the helical gear and the output connecting piece cannot directly contact. The vibration caused by the helical gear is first transmitted to the buffer component, and the buffer component absorbs most of the vibration. Therefore, the power vibration transmitted to the output connecting piece is small and the operation is stable;

[0034] The housing is the outer shell of an integrally formed integrated electric drive device. Its shape is preferably a cube, and the cavity inside the housing matches the shape of the components of the electric drive device. During installation, the front cover 51 and the lower cover 52 are opened, and the stator assembly, control module, rotor assembly, reduction component, and buffer component are installed inside the housing, and then the front cover 51 and the lower cover 52 are covered. Among them, a rear bearing 62 is provided at one end of the rotor shaft away from the stator assembly. The rear bearing is embedded in the inner wall of the housing and fixedly connected to the housing, which can ensure the smooth operation of the rotor shaft.

[0035] The components of this embodiment are further described in detail below with reference to the drawings.

[0036] Figure 2 It is a cross-sectional view of an integrated electric drive device in an embodiment. In this embodiment, the outer shell of the rotor is an uncovered hollow cylindrical small box, including an integrally formed bottom surface and side wall. The bottom surface and side wall are integrally die-cast, with simple structure, easy processing, low cost, and the coaxiality of the bottom surface and side wall is ensured, making the motor operation more reliable. The other end is a through end. The outer shell is sleeved outside the stator assembly through the through end, and then the through end of the outer shell is fixed on the base, and a control module is arranged inside the base. A number of permanent magnet steels are located outside the stator assembly and installed on the inner side wall of the outer shell. A rotor shaft mounting hole is provided at the center of the bottom surface, and the rotor shaft is in interference fit with the mounting hole.

[0037] The stator assembly and the rotor shaft are supported by a front bearing. There is at least 1 front bearing. When there is only one support bearing, the bearing is set at the midpoint of the axis of the stator assembly. The way of using one bearing can reduce the weight of the device and make the structure of the device simple. When the volume of the integrated electric drive device is small, one bearing can ensure the smooth operation of the rotor shaft.

[0038] The front bearing that supports the rotor shaft and the stator assembly can also be two, including a first front bearing and a second front bearing. The first front bearing is arranged at one end of the stator assembly axially close to the front cover, and the second front bearing is arranged at one end of the stator assembly axially close to the screw. The centers of the shaft hole, the first front bearing, and the second front bearing are on the same straight line. One end of the rotor shaft sequentially passes through the shaft hole, the second front bearing, and the first front bearing, and is fixedly connected to the shaft hole, the second front bearing, and the first front bearing. Among them, the first front bearing and the rotor shaft are in interference fit with the basic shaft system. For the connection between the second front bearing and the rotor shaft, both the stable connection between the bearing and the rotating shaft and the easy assembly and disassembly of the motor need to be considered. A clearance fit and a set screw are used for fixation, and the shaft hole and the rotor shaft are in interference fit.

[0039] In this embodiment, the other end of the rotor shaft extends out of the stator assembly and extends all the way to the reduction component to be connected to the screw. The rotor shaft is relatively long, and the length extending out of the stator assembly is not less than the length inside the stator assembly. The concentricity between the rotor shaft and the bearing is very important. When the rotor drives one end of the rotor shaft to rotate at a high speed, if the concentricity is not good, the vibration at the other end will be very obvious. To ensure the stable operation of the rotor shaft, at the other end of the rotor shaft, that is, the end far from the stator assembly, a rear bearing is used for fixation. The outer ring of the rear bearing is fixed on the inner wall of the housing, and the inner ring of the rear bearing is in interference fit with the rotor shaft. The center lines of the rear bearing, the first bearing, and the second bearing coincide to maintain the stable rotation of the rotor shaft.

[0040] In this embodiment, a buffer component is provided between the helical gear and the output connecting piece, which can effectively reduce vibration and noise. The buffer component is damping rubber, silica gel, polyethylene or polyvinyl chloride. The buffer component is a cylinder with a certain thickness. To make the buffer component have a better vibration reduction effect, the thickness is 0.5 - 1.2 times the thickness of the gear. If the buffer component is too thin, the vibration reduction effect will be weakened. Although a too thick damping component has a good vibration reduction effect, it will increase the volume of the helical gear and increase the cost. The shape and size of the buffer component are matched with the output connecting piece and the helical gear to avoid direct contact between the output connecting piece and the helical gear. When the buffer component is damping rubber, the damping coefficient is 0.1 - 1.0. The rubber with this damping coefficient has a good vibration reduction effect on the helical gear rotating at a high speed. Through tests, the vibration reduction effect is more than 85%. When the helical gear rotates, the resulting vibration is directly transmitted to the buffer component. The macromolecular chain segments inside the buffer component will generate relative movement, thereby generating a reaction force that attenuates the vibration and converting the mechanical energy generated by the vibration into heat energy. As a result, the vibration will gradually attenuate when transmitted on the buffer component, achieving the purpose of damping vibration reduction. On the other hand, based on the elastic buffering characteristics of the buffer component, the vibration will be further gradually reduced. Therefore, the vibration transmitted to the output connecting piece will be greatly weakened, making the output power stable.

[0041] Further, the buffer component includes a bushing hole 41 provided at the center. The outer diameter of the bushing hole is the same as the outer diameter of the bushing 322 at the center inside the helical gear. Along the circumferential direction of the outer diameter of the bushing hole, a number of limiting through holes 42 are provided. The limiting through holes are through holes perpendicular to the surface of the buffer component and penetrating the buffer component.

[0042] Figure 3This is a cross-sectional view of the screw and helical gear drive in this embodiment. In this embodiment, the output connecting member includes a main body 331, fixing posts 332, and an output shaft mounting hole 333. The main body of the output connecting member is a circular flat plate-like thin sheet, preferably made of metal. An output shaft mounting hole is provided at the center of the main body for mounting the output shaft. The shape of the output shaft mounting hole matches the profile of the top of the output shaft, and the shape is preferably elongated. Since the output connecting member drives the output shaft to rotate and has a large centrifugal force, a tight fit and no relative sliding are required between the output shaft and the output connecting member. A circular mounting through-hole is likely to cause sliding between the output shaft and the output connecting member during rotation, while an elongated mounting through-hole will not generate relative sliding with the output shaft under the action of centrifugal force. The output shaft can be snapped into the output shaft mounting hole or fixed and connected in other ways. On the surface perpendicular to the main body of the output connecting member, several fixing posts 332 are provided. There are at least 3 fixing posts, which are evenly arranged on the same circumference of the main body plane. The outer diameter and height of the fixing posts match the limit through-holes 42 of the buffer member. After installation, the fixing posts are inserted into the limit through-holes to fix the output connecting member to the helical gear, and the output connecting member, buffer member, and helical gear form an integral body and rotate synchronously.

[0043] An output bearing is installed on the output shaft to support the output shaft on the inner wall of the box body. The inner hole of the helical gear is in direct contact with the output shaft, and the output shaft is supported on the box body through the bearing, with a small friction coefficient. The output bearing is preferably a rolling bearing. The rolling bearing changes the sliding friction between the output shaft and the box body into rolling friction, thereby reducing friction loss. A rolling bearing generally consists of four parts: an inner ring, an outer ring, rolling elements, and a cage. The function of the inner ring is to cooperate with the output shaft and rotate with the output shaft; the function of the outer ring is to cooperate with the box body and play a supporting role; the rolling elements are evenly distributed between the inner ring and the outer ring with the help of the cage, and their shape, size, and quantity directly affect the service performance and life of the rolling bearing; the cage can evenly distribute the rolling elements and guide the rolling elements to rotate to play a lubricating role. Supporting the output shaft on the box body through the bearing can greatly reduce the frictional force.

[0044] Embodiment 2

[0045] Figure 5 This is an exploded view of an integrated electric drive device in this embodiment. The feature of this embodiment is that the gear assembly has an automatic clearance compensation and buffering function.

[0046] In this embodiment, the box body 5 includes a front box cover 51 and a lower box cover 52. A speed reduction component is housed inside the box body 5, and the speed reduction component is rotationally connected to the box body. The speed reduction component includes a screw 31, a helical gear 32, an output connecting member 33, and an output shaft 8. The helical gear and the screw are meshed inside the box body. A rotor shaft 22 is fixedly connected to the center of the screw. The rotor shaft 22 is perpendicular to the axial direction of the helical gear. One end of the rotor shaft 22 is fixedly connected to a rotor 21 inside the box body. The rotor 21 is sleeved outside the stator assembly 1 and rotates around the stator assembly 1. The output connecting member 33 is fixedly connected to the radial surface of the helical gear. The output shaft 8 is vertically fixed to the center of the output connecting member and extends from the inside of the box body to the outside as a power output component. Among them, the control module 9 is connected to the stator assembly through a power line 91 and a control line 92, and the power output of the electric drive device is controlled through a control board 93. Further, a buffer component 4 is clamped between the helical gear and the output connecting member, and the buffer component 4 is elastically connected to the helical gear and the output connecting member respectively.

[0047] Specifically, the output connecting member includes a main body 331, an adjusting spring 334, and an output shaft mounting hole 333. The main body of the output connecting member is a circular flat sheet. An output shaft mounting hole is provided at the center of the main body. The shape of the output shaft mounting hole matches the profile of the top of the output shaft and is preferably in a long strip shape for mounting the output shaft. The output shaft can be snapped into the output shaft mounting hole or fixed in other ways. A number of adjusting springs 334 are provided perpendicular to the surface of the main body 331 of the output connecting member. One end of the adjusting spring is fixedly connected to the output connecting member, and the other end is in elastic contact with the helical gear.

[0048] Further, the buffer component includes a bushing hole 41 provided at the center. The outer diameter of the bushing hole is the same as the outer diameter of the bushing inside the center of the helical gear. Along the circumferential direction of the outer diameter of the bushing hole, a number of limiting through holes 42 are provided. The limiting through holes are through holes perpendicular to the surface of the buffer component and penetrating the buffer component. Further, the helical gear includes a hollow cylindrical tooth disc. A bushing 322 is sleeved inside the tooth disc. A number of spring clamping posts 326 are evenly arranged between the bushing and the tooth disc. The spring clamping posts 326 are inserted into the limiting through holes of the buffer component.

[0049] On the surface perpendicular to the main body of the output connecting piece, several spring support columns 3341 are provided. The spring support columns are lidless cylindrical boxes. The adjustment spring 334 is snapped into and fixed within the spring support columns. The other end of the adjustment spring contacts the helical gear and can reciprocate axially along the helical gear. There are at least 3 adjustment springs, evenly arranged on the same circumference of the main body plane. The outer diameter and height of the spring support columns match the limit through holes of the buffer component. After installation, the support columns are inserted into the limit through holes to fix the output connecting piece to the helical gear. The output connecting piece, the buffer component, and the helical gear form an integral whole and rotate synchronously. Therefore, the number of limit through holes of the buffer component is the sum of the number of adjustment springs and the number of clamping posts inside the helical gear. When the outer diameters of the spring support columns and the clamping posts are the same, several limit through holes with the same aperture size are provided on the buffer component. It can also be that the outer diameters of the spring support columns and the clamping posts are different, and the aperture sizes of the limit through holes need to match the outer diameters of the spring support columns and the clamping posts respectively. Therefore, limit through holes with different aperture sizes need to be provided at the corresponding positions of the buffer component for inserting the spring support columns and the clamping posts respectively.

[0050] Further, the tooth space width of the helical gear gradually increases from the upper surface 321 to the lower surface 322. The plane passing through the axis of the screw and perpendicular to the plane of the helical gear is called the middle plane. The meshing of the screw and the dimensions within the middle plane is equivalent to the meshing of an involute gear and a rack. When the helical gear adopts a modified gear, the tooth space width e of its tooth space 2102 is: The tooth space width e satisfies: Δe = -2·tgα·m·Δx, where x is the modification coefficient, α is the pressure angle, m is the module, Δe is the tooth space change amount, and Δx is the modification coefficient change amount. It can be seen from the formula that Δe and Δx are linearly related. The slope of the tooth space of the helical gear is not a simple draft angle, but the gear is regarded as the superposition of layers of modified gear slices along the axial direction. Under the condition that the module, number of teeth, and pressure angle remain unchanged, the tooth profile of each layer of modified gear slice still maintains the characteristics of an involute tooth profile, and the involute equation of each layer is the same. Therefore, each layer of modified gear slice can be correctly meshed with the equivalent rack of the screw in the middle plane. Assume that initially, the screw and the gear are in a backlash-free meshing state. When a backlash appears due to wear, that is, when Δe appears, as long as the gear moves axially by Δx layers of gear slices, the backlash-free meshing state can be restored.

[0051] In this embodiment, a buffer component is clamped between the helical gear and the output connecting piece, so that the helical gear and the output connecting piece cannot be in direct contact. The vibration caused by the helical gear is first transmitted to the buffer component, and the buffer component absorbs most of the vibration. Therefore, the dynamic vibration transmitted to the output connecting piece is small, the operation is stable, and it can effectively reduce vibration and noise.

[0052] Embodiment 3

[0053] Figure 6 Explosion diagram of another integrated electric drive device according to this embodiment, characterized in that the gear assembly has automatic clearance compensation.

[0054] In this embodiment, the housing 5 includes a front cover 51 and a lower cover 52. A speed reduction component is accommodated in the housing 5, and the speed reduction component is rotationally connected to the housing. The speed reduction component includes a screw 31, a helical gear 32, an output connecting member 33 and an output shaft 8. The helical gear and the screw are engaged in the housing. The center of the screw is fixedly connected to a rotor shaft 22. The rotor shaft 22 is perpendicular to the axial direction of the helical gear. One end of the rotor shaft 22 is fixedly connected to a rotor 21 in the housing. The rotor 21 is sleeved outside the stator assembly 1 and rotates around the stator assembly 1. The output connecting member 33 is fixedly connected to the radial surface of the helical gear. The output shaft 8 is vertically fixed at the center of the output connecting member and extends from the inside of the housing to the outside. Among them, the control module 9 is connected to the stator assembly 1 through a power line 91 and a control line 92, and the power output of the electric drive device is controlled through a control board 93.

[0055] Figure 7 Structural schematic diagram of the helical gear according to this embodiment. The helical gear includes a hollow cylindrical tooth disc. The outer surface of the tooth disc is provided with teeth 325. The width between adjacent teeth is the tooth space width. The tooth space width gradually increases from the upper surface 321 to the lower surface 322. A bushing 323 is sleeved inside the tooth disc. The height of the bushing is the same as the height of the tooth disc, or it can also be slightly less than the height of the tooth disc. A plurality of spring retaining posts 326 are uniformly arranged between the bushing and the tooth disc. The number of spring retaining posts is the same as the number of adjusting springs. The adjusting springs are embedded in the spring retaining posts.

[0056] Further, the plane passing through the axis of the screw and perpendicular to the plane of the helical gear is called the intermediate plane. The engagement between the screw and the dimension in the intermediate plane is equivalent to the engagement between an involute gear and a rack. When the helical gear is a modified gear, the tooth space width e satisfies: Δe = -2·tgα·m·Δx, where x is the modification coefficient, α is the pressure angle, m is the module, Δe is the tooth space change amount, and Δx is the modification coefficient change amount. It can be seen from the formula that Δe and Δx are linearly related.

[0057] The slope of the tooth space of the helical gear is not a simple draft angle, but the gear is regarded as a stack of modified gear slices along the axial direction. Under the condition that the module, number of teeth and pressure angle remain unchanged, the tooth profile of each layer of modified gear slice still maintains the characteristics of an involute tooth profile, and the involute equation of each layer is the same. Therefore, each layer of modified gear slice can be correctly engaged with the equivalent rack of the screw in the intermediate plane. Assume that initially the screw and the gear are in a backlash-free engagement state. When a clearance appears due to wear, that is, when Δe appears, as long as the gear moves axially by Δx layers of gear slices, the backlash-free engagement state can be restored.

[0058] Furthermore, the helical gear 32 and the output connecting member 33 are tightly fitted with each other and have no relative movement after installation. An output shaft mounting hole 333 is provided at the center of the output connecting member for fixing the output shaft to the output connecting member. The profile of the output shaft matches the output shaft mounting hole, and the rotation of the output connecting member drives the output shaft to rotate synchronously for outputting the decelerated rotational force.

[0059] In this embodiment, the output connecting member includes a main body 331, spring support columns 3341 and an output shaft mounting hole 333. The main body of the output connecting member is a circular flat sheet. An output shaft mounting hole is provided at the center of the main body for mounting the output shaft 8. The shape of the output shaft mounting hole matches the profile of the top of the output shaft. The output shaft can be snapped into the output shaft mounting hole or fixed and connected in other ways. On the surface perpendicular to the main body of the output connecting member, several spring support columns 41 are provided. The spring support columns are lidless cylindrical boxes. The adjusting spring 4 is snapped into and fixed in the spring support column, and the other end of the adjusting spring contacts the helical gear and can reciprocate along the axial direction of the helical gear. There are at least 3 adjusting springs, which are evenly arranged on the same circumference of the main body plane. The outer diameter and height of the spring support column match the limit through holes of the buffer member. After installation, the support column is inserted into the limit through hole to fix the output connecting member to the helical gear, and the output connecting member, the buffer member and the helical gear form a whole and rotate synchronously.

[0060] This embodiment is another integrated electric drive device, which is characterized in that the gear assembly has an automatic clearance compensation function.

[0061] The above has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. An integrated electric drive device, characterized in that, comprising: A stator assembly, the stator assembly is connected to a control module through a power line and a control line, and the control module is used to control the power output of the electric drive device; A rotor assembly, including a rotor and a rotor shaft, the rotor is sleeved outside the stator assembly and rotates around the stator assembly, the rotor shaft penetrates through the axial center line of the stator assembly and extends outside the stator assembly, the rotor shaft and the stator assembly are supported by a front bearing, and the rotor shaft is fixedly connected to the rotor; A deceleration component, including a screw, a helical gear, an output connecting piece and an output shaft, the screw is fixedly sleeved at one end of the rotor shaft away from the stator assembly, the helical gear meshes with the screw, the output connecting piece is fixedly connected or elastically connected to the end face of the helical gear, the output shaft is fixedly connected to the output connecting piece, and the center line of the output shaft coincides with the axial center line of the helical gear; A box body, which is the basic part of the integrated electric drive device, the stator assembly is fixedly connected to the box body, and the helical gear, the output connecting piece and the box body are rotatably connected; A number of adjusting springs are arranged perpendicular to the surface of the output connecting piece. One end of the adjusting spring is fixedly connected to the output connecting piece, and the other end is in elastic contact with the helical gear. The tooth space width e of the helical gear satisfies: , Δe = -2·tgα·m·Δx, where x is the modification coefficient, α is the pressure angle, m is the module, Δe is the tooth space change amount, and Δx is the modification coefficient change amount; A rear bearing is sleeved at one end of the rotor shaft extending outside the stator assembly, and the outside of the rear bearing is fixed on the inner wall of the box body.

2. The integrated electric drive device according to claim 1, characterized in that, A number of spring snap columns are evenly arranged in the helical gear, the number of the spring snap columns is the same as the number of the adjusting springs, and the adjusting springs are embedded in the spring snap columns.

3. The integrated electric drive device according to claim 1, characterized in that, An output shaft mounting hole is provided in the center of the output connecting piece, and an output shaft is provided perpendicular to the surface of the output connecting piece and fixed on the output shaft mounting hole, and the profile on the output shaft matches the output shaft mounting hole.

4. The integrated electric drive device according to claim 1, characterized in that, An output bearing is mounted on the output shaft for supporting the output shaft on the inner wall of the box body.

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