Transmission mechanism, driving system and automobile

Abstract

The utility model provides a transmission mechanism, a driving system and an automobile. The transmission mechanism comprises a first planet assembly, an intermediate shaft, a second planet assembly, a brake and a clutch. The first planetary assembly is connected with the first end of the intermediate shaft, and the second planetary assembly is connected with the second end of the intermediate shaft. The brake is arranged between the second planetary assembly and the shell; and the clutch is arranged in the second planetary assembly, or the clutch is arranged between the intermediate shaft and the second planetary assembly. According to the utility model, through the combination and separation of the brake and the clutch, the probability that the driving motor works in a high-efficiency area can be greatly improved by adjusting gears and changing the total speed ratio of the transmission mechanism, the driving motor operates more working conditions in the high-efficiency area, and the maximum high efficiency of the driving motor is realized; the economical efficiency of the driving system is comprehensively improved, and different rotating speed requirements are better met.

Description

Technical Field

[0001] The utility model relates to the technical field of drive systems, in particular to a transmission mechanism, a drive system and a vehicle. Background Art

[0002] The existing transmission mechanisms are all single-speed reduction mechanisms. For single-speed reduction mechanisms, when the output speed is low, the drive motor needs to provide a lower speed, and the efficiency of the drive motor is low at this time; when the output speed is high, the speed performance requirements of the drive motor are high, resulting in a larger overall structural size of the transmission mechanism and a limited scope of application; therefore, the existing transmission mechanism cannot maximize the efficiency of the drive motor and cannot meet the use requirements. Utility Model Content

[0003] The utility model provides a transmission mechanism, a driving system and a car to solve the problem that the existing transmission mechanism cannot make the driving motor run with maximum efficiency.

[0004] A transmission mechanism comprises a first planetary assembly, an intermediate shaft, a second planetary assembly, a brake and a clutch;

[0005] The first planet assembly is connected to the first end of the intermediate shaft, and the second planet assembly is connected to the second end of the intermediate shaft;

[0006] The brake is arranged between the second planetary assembly and the housing;

[0007] The clutch is disposed in the second planetary assembly, or the clutch is disposed between the intermediate shaft and the second planetary assembly.

[0008] Preferably, the first planetary assembly comprises a first planetary gear, a first sun gear, a first ring gear and a first planet carrier;

[0009] The first planetary gear is arranged on the first planet carrier, the outer side of the first sun gear is meshed with the inner side of the first planetary gear, and the inner side of the first ring gear is meshed with the outer side of the first planetary gear;

[0010] The first ring gear is connected to the housing, and the first planet carrier is connected to the first end of the intermediate shaft, or the first planet carrier is connected to the housing, and the first ring gear is connected to the first end of the intermediate shaft.

[0011] Preferably, the second planetary assembly comprises a second planet carrier, a second planetary gear, a second sun gear and a second ring gear;

[0012] The second planetary gear is arranged on the second planetary carrier, the inner side of the second sun gear is connected to the second end of the intermediate shaft, the outer side of the second sun gear is meshed with the inner side of the second planetary gear, and the inner side of the second ring gear is meshed with the outer side of the second planetary gear.

[0013] Preferably, the brake is arranged between the second ring gear and the housing, and the second ring gear is connected to the output shaft of the intermediate shaft or the second planet carrier;

[0014] Alternatively, the brake is arranged between the second planet carrier and the housing, and the second ring gear is connected to the output shaft of the second planet carrier.

[0015] Preferably, the clutch is arranged between the intermediate shaft and the second planet carrier;

[0016] Alternatively, the clutch is disposed between the intermediate shaft and the second ring gear;

[0017] Alternatively, the clutch is disposed between the second planet carrier and the second ring gear.

[0018] A driving system comprises the transmission mechanism, a driving motor and a housing, wherein the transmission mechanism and the driving motor are both arranged in the housing;

[0019] The output shaft of the second planetary assembly of the transmission mechanism is used to connect with the workpiece to be driven;

[0020] The output shaft of the driving motor is connected to the first planetary assembly of the transmission mechanism.

[0021] Preferably, the output shaft of the drive motor, the intermediate shaft of the transmission mechanism and the output shaft of the second planetary assembly are on the same axis.

[0022] Preferably, the drive system further comprises a controller, which is connected to the drive motor, the brake and the clutch and is used to control the engagement or disconnection of the brake and the clutch.

[0023] Preferably, the driving system comprises two transmission mechanisms and two driving motors; each of the driving motors is connected to a workpiece to be driven via one of the transmission mechanisms;

[0024] The two transmission mechanisms are respectively arranged on the outsides of the two drive motors, and the two drive motors are coaxially arranged.

[0025] A car comprises the driving system and wheels, wherein the wheels are workpieces to be driven.

[0026] The transmission mechanism provided by the embodiment of the utility model is used in combination with a drive motor, and includes a first planetary assembly, an intermediate shaft, a second planetary assembly, a brake and a clutch; during installation, the first planetary assembly is fixedly connected to the first end of the intermediate shaft or is an integrated structure, and the second planetary assembly is fixedly connected to the second end of the intermediate shaft or is an integrated structure. This arrangement utilizes the combination of the first planetary assembly and the second planetary assembly to realize a two-speed planetary reduction mechanism, which can increase the transmission reduction ratio, reduce the demand for the output torque of the drive motor, and can match a drive motor with a higher speed and lower torque, so as to reduce the requirements for the motor torque performance, make it smaller and lighter, thereby improving the electric drive power density and reducing system costs.

[0027] The brake is arranged between the second planetary assembly and the housing; the clutch is arranged in the second planetary assembly, or the clutch is arranged between the intermediate shaft and the second planetary assembly; the power is provided by the drive motor, input from the output shaft of the drive motor to the first planetary assembly, and the first planetary assembly is transmitted to the second planetary assembly through the intermediate shaft. After the gear shifting and deceleration are performed through the brake and the clutch, the power is provided to the output shaft, and the output shaft transmits the power for output.

[0028] In this example, the gear position can be adjusted by the engagement and disengagement of the brake and the clutch; when the brake is engaged and the clutch is disengaged, the transmission mechanism is in the first gear transmission; when the brake is disengaged and the clutch is engaged, the transmission mechanism is in the second gear transmission; when the brake is engaged and the clutch is engaged, the transmission mechanism is in the braking gear position. The transmission mechanism has two gear positions, and the total speed ratio of the transmission mechanism can be changed by adjusting the gear position, so that the probability of the drive motor working in the high-efficiency zone is greatly improved, the drive motor has more operating conditions in the high-efficiency zone, and the maximum efficiency of the drive motor is achieved, which realizes the overall improvement of the economy of the drive system and is more adaptable to different speed requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a first arrangement diagram of the transmission mechanism in one embodiment of the utility model;

[0031] Figure 2 This is a second arrangement diagram of the transmission mechanism in one embodiment of the utility model;

[0032] Figure 3 This is a third arrangement diagram of the transmission mechanism in one embodiment of the utility model;

[0033] Figure 4 This is a fourth arrangement diagram of the transmission mechanism in one embodiment of the utility model;

[0034] Figure 5 It is a fifth arrangement diagram of the transmission mechanism in one embodiment of the utility model;

[0035] Figure 6 It is a layout diagram of a drive system in one embodiment of the utility model.

[0036] Among them, 1. first planetary assembly; 11. first planetary gear; 12. first sun gear; 13. first ring gear; 14. first planet carrier; 2. intermediate shaft; 3. second planetary assembly; 31. second planet carrier; 32. second planetary gear; 33. second sun gear; 34. second ring gear; 4. brake; 5. clutch; 6. housing; 7. drive motor; 8. wheels. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The utility model embodiment provides a transmission mechanism, referring to Figure 1-5The transmission mechanism includes a first planetary assembly 1, an intermediate shaft 2, a second planetary assembly 3, a brake 4 and a clutch 5; the first planetary assembly 1 is connected to the first end of the intermediate shaft 2, and the second planetary assembly 3 is connected to the second end of the intermediate shaft 2; the brake 4 is arranged between the second planetary assembly 3 and a housing 6; the clutch 5 is arranged in the second planetary assembly 3, or the clutch 5 is arranged between the intermediate shaft 2 and the second planetary assembly 3.

[0041] As an example, the transmission mechanism is used in combination with the drive motor 7, including a first planetary assembly 1, an intermediate shaft 2, a second planetary assembly 3, a brake 4 and a clutch 5; during installation, the first planetary assembly 1 is fixedly connected to the first end of the intermediate shaft 2 or is an integrated structure, and the second planetary assembly 3 is fixedly connected to the second end of the intermediate shaft 2 or is an integrated structure. This arrangement utilizes the combination of the first planetary assembly 1 and the second planetary assembly 3 to realize a two-speed planetary reduction mechanism, which can increase the transmission reduction ratio, reduce the output torque requirement of the drive motor 7, and can match the drive motor 7 with higher speed and lower torque, so as to reduce the requirements for the motor torque performance, make it smaller and lighter, thereby improving the electric drive power density and reducing system costs. The brake 4 is arranged between the second planetary assembly 3 and the housing 6; the clutch 5 is arranged in the second planetary assembly 3, or the clutch 5 is arranged between the intermediate shaft 2 and the second planetary assembly 3; the power is provided by the drive motor 7, and is input from the output shaft of the drive motor 7 to the first planetary assembly 1, and the first planetary assembly 1 is transmitted to the second planetary assembly 3 through the intermediate shaft 2. After the brake 4 and the clutch 5 are shifted and decelerated, the power is provided to the output shaft, and the output shaft transmits and outputs the power. In this example, the gear position can be adjusted by the engagement and separation of the brake 4 and the clutch 5; when the brake 4 is engaged and the clutch 5 is separated, the transmission mechanism is in the first gear transmission; when the brake 4 is separated and the clutch 5 is engaged, the transmission mechanism is in the second gear transmission; when the brake 4 is engaged and the clutch 5 is engaged, the transmission mechanism is in the braking gear position. The transmission mechanism has two gear positions, and the total speed ratio of the transmission mechanism can be changed by adjusting the gear position, so that the probability of the drive motor 7 working in the high-efficiency zone is greatly improved, and the drive motor 7 has more operating conditions in the high-efficiency zone, so as to achieve the maximum efficiency of the operation of the drive motor 7, realize the overall improvement of the economy of the drive system, and better adapt to different speed requirements. The clutch 5 and the brake 4 are not limited to being wet clutches or dry clutches.

[0042] In this example, the transmission ratio of the transmission mechanism can be adjusted according to actual use requirements by changing the characteristic parameters of the two sets of planetary components; the first gear ratio of the transmission mechanism is adjusted by adjusting the characteristic parameters of the first planetary component 1 and the second planetary component 3, and has a large adjustment range. While obtaining a large speed ratio, the requirements for the characteristic parameters of the planetary components can be reduced, thereby reducing the size parameters of the two planetary components and reducing the envelope size of the drive system. The second gear ratio of the transmission mechanism is adjusted by adjusting the characteristic parameters of the second planetary component 3, and can be selected according to use requirements, while ensuring deceleration, providing sufficient torque output.

[0043] In one embodiment, referring to Figure 1 and Figure 5 The first planetary assembly 1 includes a first planetary gear 11, a first sun gear 12, a first ring gear 13 and a first planetary carrier 14; the first planetary gear 11 is arranged on the first planetary carrier 14, the outer side of the first sun gear 12 is meshed with the inner side of the first planetary gear 11, and the inner side of the first ring gear 13 is meshed with the outer side of the first planetary gear 11; the first ring gear 13 is connected to the housing 6, and the first planetary carrier 14 is connected to the first end of the intermediate shaft 2, or the first planetary carrier 14 is connected to the housing 6, and the first ring gear 13 is connected to the first end of the intermediate shaft 2.

[0044] As an example, refer to Figure 1 The first planetary assembly 1 includes a first planetary gear 11, a first sun gear 12, a first ring gear 13 and a first planet carrier 14; during installation, the first planetary gear 11 is installed on the first planet carrier 14, the outer side of the first sun gear 12 is meshed with the inner side of the first planetary gear 11, and the inner side of the first ring gear 13 is meshed with the outer side of the first planetary gear 11; the outer shell of the first ring gear 13 is connected to the housing 6, the first planet carrier 14 is connected to the first end of the intermediate shaft 2, and the output shaft of the drive motor 7 is fixedly connected or integrally formed with the inner side of the first sun gear 12; the first ring gear 13 is arranged in this way to play a supporting role and does not participate in power transmission. The power is provided by the drive motor 7, transmitted to the first sun gear 12 through the output shaft, and then transmitted to the first planetary gear 11, transmitted to the first planet carrier 14 through the first planetary gear 11, and then transmitted to the intermediate shaft 2 to realize power transmission.

[0045] As an example, refer to Figure 5The first planetary assembly 1 includes a first planetary gear 11, a first sun gear 12, a first ring gear 13 and a first planetary carrier 14; during installation, the first planetary gear 11 is installed on the first planetary carrier 14, the outer side of the first sun gear 12 is meshed with the inner side of the first planetary gear 11, and the inner side of the first ring gear 13 is meshed with the outer side of the first planetary gear 11; the first planetary carrier 14 is connected to the housing 6, and the outer shell of the first ring gear 13 is connected to the first end of the intermediate shaft 2. In this way, the first planetary carrier 14 is arranged to play a supporting role and does not participate in power transmission. The power is provided by the drive motor 7, transmitted to the first sun gear 12 through the output shaft, and then transmitted to the first planetary gear 11, transmitted to the first ring gear 13 through the first planetary gear 11, and then transmitted to the intermediate shaft 2 to realize power transmission.

[0046] In one embodiment, referring to Figure 1 The second planetary assembly 3 includes a second planetary carrier 31, a second planetary gear 32, a second sun gear 33 and a second ring gear 34; the second planetary gear 32 is arranged on the second planetary carrier 31, the inner side of the second sun gear 33 is connected to the second end of the intermediate shaft 2, the outer side of the second sun gear 33 is meshed with the inner side of the second planetary gear 32, and the inner side of the second ring gear 34 is meshed with the outer side of the second planetary gear 32.

[0047] As an example, the second planetary assembly 3 includes a second planetary carrier 31, a second planetary gear 32, a second sun gear 33 and a second ring gear 34; during installation, the second planetary gear 32 is installed on the second planetary carrier 31, the inner side of the second sun gear 33 is connected to the second end of the intermediate shaft 2, the outer side of the second sun gear 33 is meshed with the inner side of the second planetary gear 32, the inner side of the second ring gear 34 is meshed with the outer side of the second planetary gear 32, and the outer side of the second ring gear 34 is connected to the housing 6; this arrangement can transmit the power transmitted from the first planetary assembly 1 to the second sun gear 33 via the intermediate shaft 2, and then to the second planetary gear 32, and then to the second planetary carrier 31 and the second ring gear 34, so as to facilitate the transmission of power.

[0048] In one embodiment, referring to Figure 2 , Figure 3 and Figure 4 The brake 4 is arranged between the second ring gear 34 and the housing 6, and the second ring gear 34 is connected to the intermediate shaft 2 or the output shaft of the second planetary carrier 31; or, the brake 4 is arranged between the second planetary carrier 31 and the housing 6, and the second ring gear 34 is connected to the output shaft of the second planetary carrier 31.

[0049] As an example, when the brake 4 is disposed between the housing of the second ring gear 34 and the housing 6, there are two arrangements of the second ring gear 34. The first arrangement is to arrange the housing of the second ring gear 34 on the intermediate shaft 2, and the second arrangement is to arrange the housing of the second ring gear 34 on the output shaft of the second planetary carrier 31. By controlling the separation or engagement of the brake 4, the working state of the second ring gear 34 in the second planetary assembly 3 can be adjusted, thereby adjusting the transmission condition of the transmission mechanism, which can be selected according to the use requirements, while ensuring deceleration, providing sufficient torque output.

[0050] As an example, refer to Figure 4 When the brake 4 is disposed between the second planet carrier 31 and the housing 6, the housing of the second ring gear 34 is connected to the output shaft of the second planet carrier 31. By controlling the separation or engagement of the brake 4, the working state of the second planet carrier 31 in the second planetary assembly 3 can be adjusted, thereby adjusting the transmission condition of the transmission mechanism, and the selection can be made according to the use requirements, while ensuring deceleration and providing sufficient torque output.

[0051] In one embodiment, referring to Figure 1 , Figure 2 and Figure 3 , the clutch 5 is arranged between the intermediate shaft 2 and the second planetary carrier 31 ; or, the clutch 5 is arranged between the intermediate shaft 2 and the second ring gear 34 ; or, the clutch 5 is arranged between the second planetary carrier 31 and the second ring gear 34 .

[0052] As an example, three arrangements of the clutch 5 are introduced. Figure 1 The clutch 5 is arranged between the intermediate shaft 2 and the second planetary carrier 31. When the clutch 5 is engaged, the intermediate shaft 2 and the second planetary carrier 31 are fixedly connected, so that the power of the first planetary assembly 1 is transmitted to the second planetary carrier 31 of the second planetary assembly 3 via the intermediate shaft 2.

[0053] The second arrangement, see Figure 2 The clutch 5 is arranged between the intermediate shaft 2 and the outer shell of the second ring gear 34. When the clutch 5 is engaged, the intermediate shaft 2 and the outer shell of the second ring gear 34 are fixedly connected, so that the power of the first planetary assembly 1 is transmitted to the outer shell of the second ring gear 34 of the second planetary assembly 3 through the intermediate shaft 2.

[0054] The third arrangement, refer to Figure 3 The clutch 5 is arranged between the second planetary carrier 31 and the outer shell of the second ring gear 34. When the clutch 5 is engaged, the outer shells of the second planetary carrier 31 and the second ring gear 34 are fixedly connected, so that the power of the first planetary assembly 1 is transmitted to the second sun gear 33 of the second planetary assembly 3 via the intermediate shaft 2, and then the second sun gear 33 transmits the power to the second planetary carrier 31.

[0055] The utility model embodiment provides a driving system, referring to Figure 1-5 , including a transmission mechanism, a drive motor 7 and a housing 6, wherein the transmission mechanism and the drive motor 7 are both arranged in the housing 6; the output shaft of the second planetary assembly 3 of the transmission mechanism is used to be connected to the workpiece to be driven; the output shaft of the drive motor 7 is connected to the inner side of the first planetary assembly 1 of the transmission mechanism.

[0056] As an example, the drive system includes a transmission mechanism, a drive motor 7 and a housing 6, the housing 6 is an internal hollow structure, and the transmission mechanism and the drive motor 7 are both arranged in the housing 6; the output shaft of the second planetary assembly 3 of the transmission mechanism is used to connect to the workpiece to be driven; the output shaft of the drive motor 7 is connected to the inner side of the first planetary assembly 1 of the transmission mechanism; the transmission mechanism is used in conjunction with the drive motor 7, and includes a first planetary assembly 1, an intermediate shaft 2, a second planetary assembly 3, a brake 4 and a clutch 5; during installation, the first planetary assembly 1 is fixedly connected to the first end of the intermediate shaft 2 or is an integral structure, and the second planetary assembly 3 is fixedly connected to the second end of the intermediate shaft 2 or is an integral structure. This arrangement utilizes the combination of the first planetary assembly 1 and the second planetary assembly 3 to realize a two-speed planetary reduction mechanism, which can increase the transmission reduction ratio, reduce the output torque requirement of the drive motor 7, and can match the drive motor 7 with a higher speed and lower torque, so as to reduce the requirements for the motor torque performance, make it smaller in size and lighter in weight, thereby improving the electric drive power density and reducing the system cost. The brake 4 is arranged between the second planetary assembly 3 and the housing 6; the clutch 5 is arranged in the second planetary assembly 3, or the clutch 5 is arranged between the intermediate shaft 2 and the second planetary assembly 3; the power is provided by the drive motor 7, and is input from the output shaft of the drive motor 7 to the first planetary assembly 1, and the first planetary assembly 1 is transmitted to the second planetary assembly 3 through the intermediate shaft 2. After the planetary assembly, the brake 4 and the clutch 5 are shifted and decelerated, the power is provided to the output shaft, and the output shaft transmits and outputs the power. In this example, the gear position can be adjusted by the engagement and separation of the brake 4 and the clutch 5; when the brake 4 is engaged and the clutch 5 is separated, the transmission mechanism is in the first gear transmission; when the brake 4 is separated and the clutch 5 is engaged, the transmission mechanism is in the second gear transmission; when the brake 4 is engaged and the clutch 5 is engaged, the transmission mechanism is in the braking gear position. The transmission mechanism has two gear positions, and the total speed ratio of the transmission mechanism can be changed by adjusting the gear position, so that the probability of the drive motor 7 working in the high-efficiency zone is greatly improved, and the drive motor 7 has more operating conditions in the high-efficiency zone, so as to achieve the maximum efficiency of the drive motor 7, realize the overall improvement of the economy of the drive system, and better adapt to different speed requirements. The clutch 5 and the brake 4 are not limited to being wet clutches or dry clutches.

[0057] In this example, the transmission ratio of the transmission mechanism can be adjusted according to actual use requirements by changing the characteristic parameters of the two sets of planetary components; the first gear ratio of the transmission mechanism is adjusted by adjusting the characteristic parameters of the first planetary component 1 and the second planetary component 3, and has a large adjustment range. While obtaining a large speed ratio, the requirements for the characteristic parameters of the planetary components can be reduced, thereby reducing the size parameters of the two planetary components and reducing the envelope size of the drive system. The second gear ratio of the transmission mechanism is adjusted by adjusting the characteristic parameters of the second planetary component 3, and can be selected according to use requirements, while ensuring deceleration, providing sufficient torque output.

[0058] In one embodiment, referring to Figure 1 The output shaft of the driving motor 7, the intermediate shaft 2 of the transmission mechanism and the output shaft of the second planetary assembly 3 are on the same axis.

[0059] As an example, the output shaft of the drive motor 7, the intermediate shaft 2 of the transmission mechanism and the output shaft of the second planetary assembly 3 are on the same axis. This arrangement makes the input and output ends of the power on the same axis, and the drive system space is compact, which is more beneficial for the overall vehicle layout. At the same time, the increased power density brought about by lightweighting enhances the competitiveness of the product.

[0060] In one embodiment, the driving system further includes a controller, which is connected to the driving motor 7, the brake 4 and the clutch 5, and is used to control the engagement or disconnection of the brake 4 and the clutch 5.

[0061] As an example, the drive system further includes a controller, which is connected to the drive motor 7, the brake 4 and the clutch 5, and is used to control the engagement or disengagement of the brake 4 and the clutch 5. By engaging and disengaging the brake 4 and the clutch 5, the gear position can be adjusted and the overall speed ratio of the transmission mechanism can be changed. The characteristic parameter of the first planetary assembly 1 is a1, and the characteristic parameter of the second planetary assembly 3 is a2. When the brake 4 is engaged and the clutch 5 is disengaged, the transmission mechanism is in first gear transmission, the second ring gear 34 is fixedly connected to the housing 6, and the reduction ratio of the drive system is (1+a1)*(1+a2); when the brake 4 is disengaged and the clutch 5 is engaged, the transmission mechanism is in second gear transmission, the second planetary carrier 31 is fixedly connected to the intermediate shaft 2, and the transmission ratio of the second planetary assembly 3 is 1, and the reduction ratio of the entire drive system is (1+a1); when the brake 4 is engaged and the clutch 5 is engaged, the transmission mechanism is in braking gear, the input shaft, the second ring gear 34 and the intermediate shaft 2 are all fixedly connected to the housing 6, and the rotation speeds of the input shaft and the output shaft are both 0r / min, and the drive system enters braking mode to achieve wheel-end braking.

[0062] In one embodiment, referring to Figure 6The driving system includes two transmission mechanisms and two driving motors 7; each driving motor 7 is connected to a workpiece to be driven through a transmission mechanism; the two transmission mechanisms are respectively arranged on the outside of the two driving motors 7, and the two driving motors 7 are coaxially arranged.

[0063] As an example, the drive system includes two transmission mechanisms and two drive motors 7; each drive motor 7 is connected to a workpiece to be driven through a transmission mechanism; the two transmission mechanisms are respectively arranged on the outside of the two drive motors 7, and the two drive motors 7 are coaxially arranged; this arrangement makes the left and right structures of the drive system present a symmetrical arrangement, and the two drive motors 7 respectively control the two workpieces to be driven to achieve appropriate control. The drive system in this example is a distributed electric drive system, and the speed ratios of the two workpieces to be driven can be different during operation, reducing the NVH risk caused by the overlap of gear orders; the distributed electric drive system has a compact space, which is more beneficial for the layout of the whole vehicle, and the power density brought by lightweighting enhances the competitiveness of the product; at the same time, the lubrication condition of the distributed electric drive system is more favorable, and there is no poor lubrication problem of the parallel axis solution on uphill and downhill conditions.

[0064] The embodiment of the utility model provides a car, comprising a driving system and a wheel 8, wherein the wheel 8 is a workpiece to be driven.

[0065] As an example, a car includes a drive system and a wheel 8, and the wheel 8 is a workpiece to be driven. The drive system can be used as a front drive system, a rear drive system, and a four-wheel drive arrangement, and can control the four wheels 8 of the car at the same time; through the combination and separation of the brake 4 and the clutch 5, the transmission mechanism has two gears, and the gear can be adjusted to change the total speed ratio of the transmission mechanism; the double planetary assembly reduction mechanism can provide a variety of speed ratio relationships, that is, it ensures that the drive motor 7 runs in the high-efficiency zone, and also ensures that the system provides sufficient output torque; through the adjustment of the gear, the utilization rate of the motor high-efficiency zone can be improved, the performance requirements of the drive motor 7 can be effectively reduced, and the system efficiency can be improved. At the same time, the reduction in the performance requirements of the drive motor 7 effectively reduces the size of the drive motor 7 structure, effectively reduces the outer envelope of the drive system, and makes the drive system compatible with more layout space. The output shaft of the drive system can be directly connected to the wheel end, or a new reduction mechanism can be added between the two to be connected to the wheel end for transmission. The output shaft of the drive system in this example is directly connected to the wheel end, and the differential is omitted compared to the existing electric drive system, which can realize direct control of the wheel end speed and torque.

[0066] The transmission mechanism in this example realizes two-gear control by adding a clutch 5 and a brake 4 on the basis of the prior art, which can make the drive motor 7 work in the most efficient area in more working conditions and improve the system efficiency. By adjusting the characteristic parameters of the planetary assembly, the motor speed is decelerated and adjusted with a large speed ratio in the first gear structure. When the required speed of the wheel end is low, the drive motor 7 does not work in the low speed area, effectively avoiding the low speed and low efficiency working range of the drive motor 7, and improving the efficiency of the drive system. The reduction ratio of the second gear structure is relatively small. When the required speed of the wheel end is high, the output speed of the drive motor 7 does not need to be too high, so the maximum output performance requirement of the drive motor 7 is reduced, the motor size can be reduced, and the arrangement of the drive motor 7 in the housing 6 is convenient, and the outer envelope of the drive system is effectively reduced, making the structure more compact and easier to arrange. By adjusting the characteristic parameters of the planetary assembly, the size parameters of the two sets of planetary assemblies can be reduced, the performance requirements of the drive motor 7 are reduced, and the size of the drive motor 7 can be reduced, so that the overall structural size parameters are reduced, while ensuring the system power, the structural size can be reduced, and the manufacturing cost can be greatly reduced.

[0067] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A transmission mechanism, characterized in that: It includes a first planetary assembly, an intermediate shaft, a second planetary assembly, a brake and a clutch; The first planet assembly is connected to the first end of the intermediate shaft, and the second planet assembly is connected to the second end of the intermediate shaft; The brake is arranged between the second planetary assembly and the housing; The clutch is disposed in the second planetary assembly, or the clutch is disposed between the intermediate shaft and the second planetary assembly.

2. The transmission mechanism according to claim 1, characterized in that: The first planetary assembly includes a first planetary gear, a first sun gear, a first ring gear and a first planet carrier; The first planetary gear is arranged on the first planet carrier, the outer side of the first sun gear is meshed with the inner side of the first planetary gear, and the inner side of the first ring gear is meshed with the outer side of the first planetary gear; The first ring gear is connected to the housing, and the first planet carrier is connected to the first end of the intermediate shaft, or the first planet carrier is connected to the housing, and the first ring gear is connected to the first end of the intermediate shaft.

3. The transmission mechanism according to claim 1, characterized in that: The second planetary assembly includes a second planet carrier, a second planetary gear, a second sun gear and a second ring gear; The second planetary gear is arranged on the second planetary carrier, the inner side of the second sun gear is connected to the second end of the intermediate shaft, the outer side of the second sun gear is meshed with the inner side of the second planetary gear, and the inner side of the second ring gear is meshed with the outer side of the second planetary gear.

4. The transmission mechanism according to claim 3, characterized in that: The brake is arranged between the second ring gear and the housing, and the second ring gear is connected to the output shaft of the intermediate shaft or the second planet carrier; Alternatively, the brake is arranged between the second planet carrier and the housing, and the second ring gear is connected to the output shaft of the second planet carrier.

5. The transmission mechanism according to claim 3, characterized in that: The clutch is arranged between the intermediate shaft and the second planet carrier; Alternatively, the clutch is disposed between the intermediate shaft and the second ring gear; Alternatively, the clutch is disposed between the second planet carrier and the second ring gear.

6. A drive system, characterized in that: It comprises the transmission mechanism, the drive motor and the housing according to any one of claims 1 to 5, wherein the transmission mechanism and the drive motor are both arranged in the housing; The output shaft of the second planetary assembly of the transmission mechanism is used to connect with the workpiece to be driven; The output shaft of the driving motor is connected to the first planetary assembly of the transmission mechanism.

7. The drive system according to claim 6, characterized in that: The output shaft of the driving motor, the intermediate shaft of the transmission mechanism and the output shaft of the second planetary assembly are on the same axis.

8. The drive system according to claim 6, characterized in that: The driving system further comprises a controller, which is connected to the driving motor, the brake and the clutch and is used for controlling the engagement or disconnection of the brake and the clutch.

9. The drive system according to claim 6, characterized in that: The driving system includes two transmission mechanisms and two driving motors; each of the driving motors is connected to a workpiece to be driven through a transmission mechanism; The two transmission mechanisms are respectively arranged on the outsides of the two drive motors, and the two drive motors are coaxially arranged.

10. An automobile, characterized in that: It comprises the driving system and wheel as described in any one of claims 6 to 9, wherein the wheel is a workpiece to be driven.

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