Four-speed-ratio double-planetary-gear speed change device

Abstract

The utility model belongs to the technical field of transmissions, and discloses a four-speed-ratio double-planetary-gear speed change device which comprises a machine frame, a motor assembly, a front planetary gear set, a front gear shifting component, a rear gear shifting component and a rear planetary gear set. The motor assembly comprises a motor stator, a motor rotor, a first center shaft and a second center shaft, the motor stator is fixed, and the motor rotor is used for driving. A front gear ring of the front planetary gear set is connected with a front driven piece, and a front sun gear is connected with a motor rotor through a first center shaft. A rear gear ring of the rear planetary gear set is connected with a rear driven piece, and a rear sun gear is connected with a front planet carrier of the front planetary gear set through a second center shaft. The design of the double planetary gear sets is adopted, gear shifting is conducted through the two gear shifting elements, the stable and smooth gear shifting process of four gears is achieved, and the structure is more compact and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmissions, and in particular relates to a four-speed ratio double planetary gear transmission device. Background Art

[0002] Planetary gears are widely used in transmissions. A typical planetary gear set consists of a sun gear, multiple planetary gears, a planetary carrier, and a ring gear. Various combinations of these gears can achieve a wide range of transmission ratios. Planetary gear sets offer advantages such as compact structure, strong load-carrying capacity, high transmission efficiency, and stable operation. While many electric vehicles utilize single-speed transmissions, planetary gear sets still play an important role in some multi-speed electric transmissions and hybrid systems.

[0003] Currently, planetary gear sets can achieve smooth gear shifting and efficient power transmission. For example, Chinese invention patent CN103438162B discloses a dual planetary gear transmission. This increases the number of shift actuators in the original dual planetary gear three-speed transmission, allowing for more complex combinations between the basic components of the front and rear planetary gears, thereby forming four forward gears, including an overdrive gear. Utility Model Content

[0004] The present invention addresses the aforementioned shortcomings of the prior art. While existing dual planetary gear transmissions can achieve four forward gears, they are relatively complex in structure. Furthermore, they cannot be integrated with an electric motor, resulting in a large space requirement and high transmission losses. The present invention provides a four-speed ratio dual planetary gear transmission, improving the shifting mechanism and effectively integrating the drive motor with the dual planetary gears, resulting in a more compact and stable structure.

[0005] In order to achieve the above object, the utility model provides a four-speed ratio dual planetary gear transmission device, including: a frame, a motor assembly, a front planetary gear set, a front shift component, a rear shift component, and a rear planetary gear set.

[0006] The motor assembly includes a motor stator, a motor rotor, a first central shaft, and a second central shaft. The motor stator is fixed and the motor rotor is driven.

[0007] The front shift component includes a front driving member, a front driven member, and a front locking member. The front driving member is connected to the motor rotor via a first central shaft. The front driven member is connected to the front driving member or the front locking member according to the gear position requirement, or is connected to neither the front driving member nor the front locking member. The front locking member is connected to the frame.

[0008] The rear shift component includes a rear active member, a rear driven member, and a rear locking member. The rear active member is connected to the motor rotor. The rear driven member is connected to the rear active member or the rear locking member according to the gear position requirement, or is connected to neither the rear active member nor the rear locking member. The rear locking member is connected to the frame.

[0009] a rear shift component, comprising a rear driving member, a rear driven member, and a rear locking member, wherein the rear driving member is connected to the front planetary carrier of the front planetary gear set, and the rear driven member is connected to the rear driving member or the rear locking member according to the gear position requirement, or is connected to neither the rear driving member nor the rear locking member; the rear locking member is connected to the frame;

[0010] The front planetary gear set includes a front sun gear, a front ring gear, a front planet carrier, and a front planet gear, wherein the front ring gear is connected to the front driven member, and the front sun gear is connected to the motor rotor through the first central shaft;

[0011] The rear planetary gear set includes a rear sun gear, a rear ring gear, a rear planet carrier, and a rear planet gear. The rear ring gear is connected to the rear driven member, and the rear sun gear is connected to the front planet carrier of the front planetary gear set through a second center shaft.

[0012] According to another embodiment of the present invention or any of the aforementioned embodiments, the speed change device further includes a differential, the input shaft of the differential is dynamically connected to the rear planetary carrier, the first output shaft and the second output shaft of the differential are parallel to the first center shaft and the second center shaft; the first center shaft and the second center shaft are hollow shafts, and the first output shaft of the differential passes through the first center shaft and the second center shaft.

[0013] According to another embodiment of the present invention or the speed change device of any of the aforementioned embodiments, the front shift component and the rear shift component are synchronizers.

[0014] According to another embodiment of the present invention or the speed change device of any of the aforementioned embodiments, the motor assembly, the front shift component, the front planetary gear set, the rear shift component, and the rear planetary gear set are coaxially arranged in sequence.

[0015] According to another embodiment of the present invention or a speed change device of any of the aforementioned embodiments, the first center shaft and the front sun gear are two components fixedly connected, or are the same component; the second center shaft and the rear sun gear are two components fixedly connected, or are the same component.

[0016] According to another embodiment of the present invention or the speed change device of any of the aforementioned embodiments, the motor rotor, the first central shaft and the front driving member are two components that are fixedly connected, or are the same component.

[0017] Beneficial effects of the utility model:

[0018] The four-speed ratio dual planetary gear transmission described in this utility model utilizes a dual planetary gear set design, shifting via two sets of shifting elements. This flexible combination of the drive motor, the planetary gear set, and the shifting components results in a more compact and reliable structure. Furthermore, transmission losses between the gears are minimized, resulting in more direct and efficient energy transfer. Precise gear meshing and a hydraulic control system enable smooth shifting across four gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the four-speed ratio dual planetary gear transmission device of the present invention;

[0020] Figure 2 This is a schematic diagram of the power transmission route of the first gear mode of the four-speed ratio double planetary gear transmission device of the present invention;

[0021] Figure 3 This is a schematic diagram of the power transmission route of the second gear mode of the four-speed ratio double planetary gear transmission device of the present invention;

[0022] Figure 4 This is a schematic diagram of the power transmission route of the three-speed mode of the four-speed ratio double planetary gear transmission device of the present invention;

[0023] Figure 5 This is a schematic diagram of the power transmission route of the four-speed ratio dual planetary gear transmission device in the fourth gear mode of the present invention;

[0024] Figure 6 This is a schematic structural diagram of a four-speed ratio dual planetary gear transmission device provided with a differential according to the present invention;

[0025] In the picture:

[0026] 10. Motor assembly; 11. Motor stator; 12. Motor rotor; 13. First central axis; 14. Second central axis;

[0027] 20. Front planetary gear set; 21. Front sun gear; 22. Front ring gear; 23. Front planet carrier; 24. Front planetary gear;

[0028] 30. Rack;

[0029] 40. Front shift component; 41. Front driving component; 42. Front driven component; 43. Front locking component;

[0030] 50. Differential; 51. First output shaft; 52. Second output shaft.

[0031] 60. Rear shift component; 61. Rear driving component; 62. Rear driven component; 63. Rear locking component;

[0032] 70. Rear planetary gear set; 71. Rear sun gear; 72. Rear ring gear; 73. Rear planetary carrier; 74. Rear planetary gear. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] Example 1:

[0035] like Figure 1 As shown, a four-speed ratio dual planetary gear transmission device includes: a frame 30, a motor assembly 10, a front planetary gear set 20, a front shift component 40, a rear shift component 60, and a rear planetary gear set 70.

[0036] The motor assembly 10 includes a motor stator 11 , a motor rotor 12 , a first central shaft 13 , and a second central shaft 14 . The motor stator 11 is fixed, and the motor rotor 12 is driven.

[0037] The front shift component 40 includes a front driving member 41, a front driven member 42, and a front locking member 43. The front driving member 41 is connected to the motor rotor 12 through the first central shaft 13. The front driven member 42 is connected to the front driving member 41 or the front locking member 43 according to the gear requirement, or is connected to neither the front driving member 41 nor the front locking member 43; the front locking member 43 is connected to the frame 30.

[0038] The rear shift component 60 includes a rear active member 61, a rear driven member 62, and a rear locking member 63. The rear active member 61 is connected to the motor rotor 12, and the rear driven member 62 is connected to the rear active member 61 or the rear locking member 63 according to the gear requirement, or is connected to neither the rear active member 61 nor the rear locking member 63; the rear locking member 63 is connected to the frame 30.

[0039] The rear shift component 60 includes a rear driving member 61, a rear driven member 62, and a rear locking member 63. The rear driving member 61 is connected to the front planetary carrier 23 of the front planetary gear set 20. The rear driven member 62 is connected to the rear driving member 61 or the rear locking member 63 according to the gear requirement, or is connected to neither the rear driving member 61 nor the rear locking member 63; the rear locking member 63 is connected to the frame 30.

[0040] The front shift component 40 and the rear shift component 60 are preferably synchronizers, so that the shifting is more stable and reliable.

[0041] The front planetary gear set 20 includes a front sun gear 21 , a front ring gear 22 , a front planetary carrier 23 , and front planetary gears 24 . The front ring gear 22 is connected to the front driven member 42 , and the front sun gear 21 is connected to the motor rotor 12 via the first central shaft 13 .

[0042] The rear planetary gear set 70 includes a rear sun gear 71 , a rear ring gear 72 , a rear planet carrier 73 , and a rear planet gear 74 . The rear ring gear 72 is connected to the rear follower 62 , and the rear sun gear 71 is connected to the front planet carrier 23 of the front planetary gear set 20 through the second center shaft 14 .

[0043] In order to make the structure more compact and reliable, the motor assembly 10, the front shift component 40, the front planetary gear set 20, the rear shift component 60, and the rear planetary gear set 70 are coaxially arranged in sequence.

[0044] To ensure structural strength and minimize space usage, the first central shaft 13 and the front sun gear 21 are fixedly connected or formed as a single component. The second central shaft 14 and the rear sun gear 71 are fixedly connected or formed as a single component. The motor rotor 12, the first central shaft 13, and the front driving member 41 are fixedly connected or formed as a single component.

[0045] Example 2:

[0046] like Figure 6 As shown, other structures are the same as those of the first embodiment, except that it also includes a differential 50. The input shaft of the differential 50 is dynamically connected to the rear planetary carrier 73, and the first output shaft 51 and the second output shaft 52 of the differential 50 are parallel to the first center shaft 13 and the second center shaft 14; the first center shaft 13 and the second center shaft 14 are hollow shafts, and the first output shaft 51 of the differential 50 passes through the first center shaft 13 and the second center shaft 14.

[0047] The working principle of this utility model:

[0048] This utility model is equipped with a front planetary gearset 20 and a rear planetary gearset 70. Through the combination of these two planetary gearsets, two synchronizers, and a drive motor, it can provide up to four different transmission ratios for power output, adapting to various driving conditions. From low-speed starting to high-speed cruising, the four-speed dual planetary gear transmission provides the appropriate torque output and transmission ratio to meet different driving needs. This versatility enables the vehicle to maintain optimal operating conditions under various road and load conditions, improving both power performance and energy efficiency.

[0049] As the instruction manual Figure 2-5 As shown, the synchronizer connection mode and power transmission route corresponding to each gear are as follows:

[0050] Neutral: As Figure 1As shown, at this time, the front driven member 42 of the front shift component 40 is not connected to either the front driving member 41 or the frame 30; or the rear driven member 62 of the rear shift component 60 is not connected to either the rear driving member 61 or the frame 30; or the driven members of the front shift component 40 and the rear shift component 60 are not connected to either the driving member or the frame 30. In this case, power cannot be output from the drive motor to the front planetary gear set 20, and thus cannot be output to the rear planetary gear set 70, and the rear planetary carrier 73 of the rear planetary gear set 70 can rotate freely.

[0051] First gear: Figure 2 As shown, the front driven member 42 of the front shift component 40 is connected to the locking member. At this time, the front ring gear 22 of the front planetary gear set 20 is connected to the frame 30 through the front driven member 42 and the front locking member 43, and the front ring gear 22 is locked. At this time, the motor rotor 12 of the motor assembly 10 drives the front sun gear 21 of the front planetary gear set 20 through the first central shaft 13. At this time, the speed ratio of the front planetary gear set 20 is the highest.

[0052] The rear follower 62 of the rear shift component 60 is connected to the frame 30 through the rear locking member 63. At this time, the rear ring gear 72 of the rear planetary gear set 70 is locked. At this time, the speed ratio of the rear planetary gear set 70 is also the largest, and the output speed is the lowest and the torque is the largest.

[0053] Second gear: Figure 3 As shown, the front driving member 41 of the front shift component 40 is connected to the front driven member 42. At this time, the motor rotor 12 of the motor assembly 10 drives the front ring gear 22 of the front planetary gear set 20 through the first center shaft 13, the driving member, and the driven member. At the same time, the motor rotor 12 of the motor assembly 10 drives the front sun gear 21 through the first center shaft 13. At this time, the speed ratio of the output speed of the front planetary carrier 23 is 1:1, and the motor assembly 10 directly outputs, which has a higher transmission efficiency.

[0054] The rear follower 62 of the rear shift component 60 is connected to the frame 30 through the rear locking member 63. At this time, the rear ring gear 72 of the rear planetary gear set 70 is locked. At this time, the speed ratio of the rear planetary gear set 70 is the largest, and the output speed ratio is the speed ratio of the rear planetary gear set 70.

[0055] Third gear: Figure 4 As shown, the front driven member 42 of the front shift component 40 is connected to the locking member. At this time, the front ring gear 22 of the front planetary gear set 20 is connected to the frame 30 through the front driven member 42 and the front locking member 43, and the front ring gear 22 is locked. At this time, the motor rotor 12 of the motor assembly 10 drives the front sun gear 21 of the front planetary gear set 20 through the first central shaft 13. At this time, the speed ratio of the front planetary gear set 20 is the highest.

[0056] The rear driving member 61 of the rear shift component 60 is connected to the rear driven member 62, and the power of the front planetary carrier 23 drives the rear ring gear 72 of the rear planetary gear set 70 via the rear driving member 61 and the rear driven member 62; at the same time, the front planetary carrier 23 drives the rear sun gear 71 of the rear shift component 60 via the second center shaft 14. At this time, the rear ring gear 72 and the rear sun gear 71 are both driven by the front planetary carrier 23, and the speed ratio of the rear planetary gear set 70 is 1:1. At this time, the output speed ratio is the speed ratio of the front planetary gear set 20.

[0057] Fourth gear: Figure 5 As shown, the front driving member 41 of the front shift component 40 is connected to the front driven member 42. At this time, the motor rotor 12 of the motor assembly 10 drives the front ring gear 22 of the front planetary gear set 20 through the first center shaft 13, the driving member, and the driven member. At the same time, the motor rotor 12 of the motor assembly 10 drives the front sun gear 21 through the first center shaft 13. At this time, the speed ratio of the output speed of the front planetary carrier 23 is 1:1, and the motor assembly 10 directly outputs, which has a higher transmission efficiency.

[0058] The rear driving member 61 of the rear shift component 60 is connected to the rear driven member 62, and the power of the front planetary carrier 23 drives the rear ring gear 72 of the rear planetary gear set 70 via the rear driving member 61 and the rear driven member 62; at the same time, the front planetary carrier 23 drives the rear sun gear 71 of the rear shift component 60 via the second center shaft 14. At this time, the rear ring gear 72 and the rear sun gear 71 are both driven by the front planetary carrier 23, and the speed ratio of the rear planetary gear set 70 is 1:1. At this time, the output speed ratio is directly output by the rotational speed, which has the highest transmission efficiency.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments are merely illustrative of the technical concepts and features of the present invention, and are intended to enable those familiar with the art to understand and implement the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit and substance of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A four-speed ratio dual planetary gear transmission, characterized in that: It includes a frame (30), a motor assembly (10), a front planetary gear set (20), a front shift component (40), a rear shift component (60), and a rear planetary gear set (70). The motor assembly (10) comprises a motor stator (11), a motor rotor (12), a first central axis (13), and a second central axis (14); the motor stator (11) is fixed, and the motor rotor (12) is driven. The front shift component (40) includes a front active component (41), a front driven component (42), and a front locking component (43). The front active component (41) is connected to the motor rotor (12) via a first central shaft (13). The front driven component (42) is connected to the front active component (41) or the front locking component (43) according to the gear position requirement, or is not connected to the front active component (41) or the front locking component (43). The front locking component (43) is connected to the frame (30). A rear shift component (60) includes a rear active component (61), a rear driven component (62), and a rear locking component (63). The rear active component (61) is connected to the motor rotor (12). The rear driven component (62) is connected to the rear active component (61) or the rear locking component (63) according to the gear position requirement, or is not connected to the rear active component (61) or the rear locking component (63). The rear locking component (63) is connected to the frame (30). a rear shift component (60) comprising a rear driving member (61), a rear driven member (62), and a rear locking member (63); the rear driving member (61) is connected to the front planetary carrier (23) of the front planetary gear set (20); the rear driven member (62) is connected to the rear driving member (61) or the rear locking member (63) according to the gear position requirement, or is not connected to the rear driving member (61) or the rear locking member (63); the rear locking member (63) is connected to the frame (30); The front planetary gear set (20) includes a front sun gear (21), a front ring gear (22), a front planet carrier (23), and a front planet gear (24); the front ring gear (22) is connected to a front driven member (42); and the front sun gear (21) is connected to a motor rotor (12) via a first central shaft (13); The rear planetary gear set (70) includes a rear sun gear (71), a rear ring gear (72), a rear planet carrier (73), and a rear planet gear (74). The rear ring gear (72) is connected to the rear driven member (62), and the rear sun gear (71) is connected to the front planet carrier (23) of the front planetary gear set (20) through a second central shaft (14).

2. The four-speed ratio dual planetary gear transmission according to claim 1, characterized in that: The invention also includes a differential (50), wherein the input shaft of the differential (50) is connected to the rear planetary carrier (73) in a power connection, and the first output shaft (51) and the second output shaft (52) of the differential (50) are parallel to the first center shaft (13) and the second center shaft (14); the first center shaft (13) and the second center shaft (14) are hollow shafts, and the first output shaft (51) of the differential (50) passes through the first center shaft (13) and the second center shaft (14).

3. A four-speed ratio dual planetary gear transmission according to claim 1 or 2, characterized in that: The front shift component (40) and the rear shift component (60) are synchronizers.

4. A four-speed ratio dual planetary gear transmission according to claim 1 or 2, characterized in that: The motor assembly (10), the front shift component (40), the front planetary gear set (20), the rear shift component (60), and the rear planetary gear set (70) are coaxially arranged in sequence.

5. A four-speed ratio dual planetary gear transmission according to claim 1 or 2, characterized in that: The first central shaft (13) and the front sun gear (21) are two components that are fixedly connected, or are the same component; the second central shaft (14) and the rear sun gear (71) are two components that are fixedly connected, or are the same component.

6. A four-speed ratio dual planetary gear transmission according to claim 1 or 2, characterized in that: The motor rotor (12), the first central shaft (13) and the front active member (41) are two components that are fixedly connected, or are the same component.

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