Two-gear transmission mechanism and double-speed electric drive assembly

Abstract

The invention relates to a two-gear transmission mechanism and a double-speed electric drive assembly. The transmission mechanism comprises an input shaft and an output shaft. The first reducing mechanism and the second reducing mechanism are different in reduction ratio, the input end of the first reducing mechanism is connected with the input shaft, the output end of the first reducing mechanism is connected with the output shaft through a first one-way transmission structure, the input end of the second reducing mechanism is connected with the input shaft, and the output end of the second reducing mechanism is connected with the output shaft through a second one-way transmission structure; when the input shaft rotates in the first rotating direction, the first speed reducing mechanism transmits power to the output shaft and disconnects power transmission between the second speed reducing mechanism and the input shaft, and when the input shaft rotates in the reverse direction, the second speed reducing mechanism transmits power to the output shaft and disconnects power transmission between the second speed reducing mechanism and the input shaft. And the rotation directions of the output shafts are the same. According to the transmission mechanism, power output of two gears of the transmission mechanism can be achieved, the gear shifting action is achieved by switching the running direction of the motor, the gear shifting action is simple, and gear shifting can be rapidly conducted.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive systems, and in particular to a two-speed transmission mechanism and a two-speed electric drive assembly. Background Art

[0002] The transmission mechanism of the electric drive axle is one of its core parts. In order to meet the needs of low-speed and high-speed driving of the whole vehicle, the transmission mechanism needs to be able to achieve power output in at least two gears.

[0003] Currently, transmission mechanisms mostly use reducers with different transmission ratios and shift mechanisms. The motor is connected to reducers with different reduction ratios through the shift mechanism to achieve power output at different gears, which has the problem of complex shifting action. Summary of the invention

[0004] Based on the above description, the present invention provides a two-speed transmission mechanism and a two-speed electric drive assembly to solve the problem that the current transmission mechanisms mostly use reducers and shift mechanisms with different transmission ratios, and the motor is connected to reducers with different reduction ratios through the shift mechanism to achieve power output at different gears, resulting in complex shifting actions.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: In the first aspect, the present application provides a two-speed transmission mechanism, and the technical solution adopted is as follows: A two-speed transmission mechanism, comprising: Axis-parallel input and output shafts; A first reduction mechanism and a second reduction mechanism with different reduction ratios, wherein the input end of the first reduction mechanism is connected to the input shaft and the output end is connected to the output shaft through a first one-way transmission structure, and the input end of the second reduction mechanism is connected to the input shaft and the output end is connected to the output shaft through a second one-way transmission structure; Among them, when the input shaft rotates along the first rotation direction, the first reduction mechanism transmits the input shaft power to the output shaft through the first one-way transmission structure, and the second one-way transmission structure disconnects the power transmission between the second reduction mechanism and the input shaft. When the input shaft rotates in the opposite direction, the second reduction mechanism transmits the input shaft power to the output shaft through the second one-way transmission structure, and the first one-way transmission structure disconnects the power transmission between the second reduction mechanism and the input shaft. When the input shaft rotates along the first rotation direction or rotates in the opposite direction, the output shaft is driven to rotate in the same direction.

[0006] Preferably, the input shaft is provided with a first input gear and a second input gear, the first reduction mechanism comprises an active gear ring coaxially arranged with the output shaft, the first input gear is located inside the active gear ring and meshes with the active gear ring, and the first one-way transmission structure connects the active gear ring and the output shaft; The second speed reduction mechanism comprises a driving gear coaxially arranged with the output shaft, the driving gear is meshed with the second input gear, and the second one-way transmission structure connects the driving gear and the output shaft.

[0007] Preferably, the active ring gear can be selectively connected to or disconnected from the output shaft through a first movable locking structure. The active ring gear and the output shaft are restricted from relative rotation when connected through the first movable locking structure, and can rotate relative to each other when disconnected.

[0008] Preferably, the driving gear can be selectively connected to or disconnected from the output shaft through the second movable locking structure. The driving gear and the output shaft are restricted from relative rotation when connected through the second movable locking structure, and can rotate relative to each other when disconnected.

[0009] Preferably, the first unidirectional transmission structure includes a first spline hub and a first unidirectional transmission member. The first spline hub is coaxially arranged with the output shaft and connected to the driving ring gear through the first unidirectional transmission member. The first spline hub can be selectively connected to the output shaft to transmit power or disconnected to disconnect power transmission through a shifting mechanism.

[0010] Preferably, it also includes a reverse gear transmission mechanism, whose input end is connected to the input shaft, and whose output end can be selectively connected to the output shaft through the shift mechanism to transmit power or disconnected to disconnect power transmission, and the input shaft drives the output shaft to rotate in the second rotation direction through the first reduction mechanism and the first one-way transmission structure; When the input shaft rotates in the first rotation direction and the shift mechanism disconnects the first spline hub from the output shaft and connects the reverse gear transmission mechanism to the output shaft, the output shaft is driven to rotate in a direction opposite to the second rotation direction by the reverse gear transmission mechanism, and the rotation speed of the output shaft is not greater than the rotation speed of the driving gear.

[0011] Preferably, the reverse gear transmission mechanism comprises a reverse gear coaxially arranged with the output shaft, the reverse gear is meshed with the first input gear, and the shifting mechanism connects the reverse gear and the output shaft.

[0012] Preferably, the first reduction mechanism comprises a second spline hub coaxially fixed with the driving ring gear, and the first one-way transmission structure connects the second spline hub and the output shaft; The first movable locking structure includes a first locking gear and a first sliding engagement sleeve. The first locking gear is coaxially fixed with the output shaft, the first sliding engagement sleeve is coaxial with and meshed with the first locking gear, and the first sliding engagement sleeve can slide axially relative to the first locking gear until it engages or disengages with the second spline hub.

[0013] Preferably, the first one-way transmission member comprises a one-way bearing.

[0014] In a second aspect, the present application provides a dual-speed electric drive assembly, comprising the two-speed transmission mechanism as described above.

[0015] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects: 1. The present application inputs power and outputs power through an input shaft and an output shaft respectively. The input shaft can realize power output of different gears through a first reduction mechanism and a second reduction mechanism with different reduction ratios, and the first reduction mechanism and the second reduction mechanism are connected to the output shaft through a first one-way transmission structure and a second one-way transmission structure respectively. When the input shaft rotates in a first rotation direction, the first reduction mechanism transmits the input shaft power to the output shaft through the first one-way transmission structure, and the second one-way transmission structure disconnects the power transmission between the second reduction mechanism and the input shaft. When the input shaft rotates in the opposite direction, the second reduction mechanism transmits the input shaft power to the output shaft through the second one-way transmission structure, and the first one-way transmission structure disconnects the power transmission between the second reduction mechanism and the input shaft. When the input shaft rotates in the first rotation direction or in the opposite direction, the direction in which the output shaft is driven to rotate is the same. That is, when the output shaft of the motor rotates in two opposite directions, the power is transmitted to the output shaft through the first reduction mechanism and the second reduction mechanism at a reduced speed, so that the output speed of the output shaft is different, and the power output of the transmission mechanism in two gears is realized. And the gear shifting action is realized by switching the running direction of the motor, and the gear shifting action is simple and can shift gears quickly.

[0016] 2. In the present application, the active ring gear of the first reduction mechanism can be selectively connected or disconnected with the output shaft through the first active locking structure, and the active gear of the second reduction mechanism can be selectively connected or disconnected with the output shaft through the second active locking structure. When the active ring gear is disconnected from the output shaft, the output power of the active ring gear is transmitted to the output shaft through the first one-way transmission structure, that is, the power transmission from the motor to the half-shaft direction under this gear can be carried out normally, but the power transmission from the half-shaft to the motor direction cannot be achieved. When the active ring gear is connected to the output shaft through the first active locking structure, the active ring gear and the output shaft are restricted from relative rotation, and the power can be transmitted from the half-shaft to the motor direction, so as to achieve the purpose of energy recovery under this gear. Similarly, when the active gear is disconnected from the output shaft, the output power of the active gear is transmitted to the output shaft through the second one-way transmission structure, and when the active ring gear is connected to the output shaft, the active ring gear and the output shaft are restricted from relative rotation, and the power can be transmitted from the half-shaft to the motor direction, so as to achieve the purpose of energy recovery under this gear. Therefore, the present application can realize the function of energy recovery of the transmission mechanism through the first movable locking structure and the second movable locking structure.

[0017] 3. The present application sets a shift mechanism and a reverse gear transmission mechanism. The first spline hub of the first one-way transmission structure is connected to the active gear ring through the first one-way transmission member, and the first spline hub can be selectively connected to the output shaft through the shift mechanism to transmit power or disconnected to disconnect the power transmission. The input end of the reverse gear transmission mechanism is connected to the input shaft, and the output end can be selectively connected to the output shaft through the shift mechanism to transmit power or disconnected to disconnect the power transmission. When the first spline hub is connected to the output shaft through the shift mechanism, and the output end of the reverse gear transmission mechanism is disconnected from the output shaft, the power output by the first reduction mechanism can be transmitted to the first spline hub through the first one-way transmission member, and then transmitted to the output shaft to rotate the output shaft, thereby realizing power output in this gear position, and the power transmission between the reverse gear transmission mechanism and the output shaft is disconnected. When the first spline hub is disconnected from the output shaft through the shift mechanism, and the output end of the reverse gear transmission mechanism is connected to the output shaft, the power transmission between the first spline hub and the output shaft is disconnected, that is, the power transmission between the first reduction mechanism and the output shaft is disconnected, and the input shaft output power is input into the reverse gear transmission mechanism, and then input into the output shaft through the shift mechanism, so that the output shaft rotates in the opposite direction, thereby achieving the purpose of reverse gear power output. And when the transmission structure connects both the first spline hub and the reverse gear transmission mechanism to the output shaft, the output shaft can be locked and cannot rotate, thereby achieving the parking function. Therefore, the present application can achieve the power output of two forward gears and reverse gear and the parking function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a two-speed transmission mechanism provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a dual-speed electric drive assembly provided in an embodiment of the present invention.

[0019] Description of reference numerals: 1. Input shaft; 11. First input gear; 12. Second input gear; 2. Output shaft; 21. Output gear; 3. First reduction mechanism; 31. Active gear ring; 32. Second spline hub; 4. Second reduction mechanism; 41. Active gear; 5. First one-way transmission structure; 51. First spline hub; 52. First one-way transmission member; 6. Second one-way transmission structure; 61. Second one-way transmission member; 62. Fourth spline hub; 7. Shift mechanism; 71. Shift gear; 72. Shift sliding meshing sleeve; 8. Reverse gear transmission mechanism; 81. Reverse gear; 82. Third spline hub; 9. First movable locking structure; 91. First locking gear; 92. First sliding meshing sleeve; 10. Second movable locking structure; 101. Second locking gear; 102. Second sliding meshing sleeve; 20. Motor; 30. Differential; 301. Driven gear. DETAILED DESCRIPTION

[0020] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0022] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0023] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0024] When used herein, the singular forms "a", "an" and " / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0025] Reference Figure 1-2As shown, the present application provides a two-speed transmission mechanism, which includes an input shaft 1 and an output shaft 2 with parallel axes, and a first reduction mechanism 3 and a second reduction mechanism 4 with different reduction ratios. The input end of the first reduction mechanism 3 is connected to the input shaft 1, and the output end is connected to the output shaft 2 through a first one-way transmission structure 5. The input end of the second reduction mechanism 4 is connected to the input shaft 1, and the output end is connected to the output shaft 2 through a second one-way transmission structure 6. When the input shaft 1 rotates in a first rotation direction, the first reduction mechanism 3 transmits the power of the input shaft 1 to the output shaft 2 through the first one-way transmission structure 5, and the second one-way transmission structure 6 disconnects the power transmission between the second reduction mechanism 4 and the input shaft 1. When the input shaft 1 rotates in the reverse direction, the second reduction mechanism 4 transmits the power of the input shaft 1 to the output shaft 2 through the second one-way transmission structure 6, and the first one-way transmission structure 5 disconnects the power transmission between the second reduction mechanism 4 and the input shaft 1. When the input shaft 1 rotates in the first rotation direction or in the reverse direction, the direction in which the output shaft 2 is driven to rotate is the same.

[0026] Reference Figure 1 As shown, the input shaft 1 is used to connect with the motor 20, and the output shaft 2 is used to output power. In order to achieve different reduction ratios of the first reduction mechanism 3 and the second reduction mechanism 4, a first input gear 11 and a second input gear 12 are provided on the input shaft 1. The first reduction mechanism 3 includes an active ring gear 31 coaxially arranged with the output shaft 2. The first input gear 11 is located inside the active ring gear 31 and meshes with the active ring gear 31. The first one-way transmission structure 5 connects the active ring gear 31 and the output shaft 2. The second reduction mechanism 4 includes an active gear 41 coaxially arranged with the output shaft 2. The active gear 41 meshes with the second input gear 12. The second one-way transmission structure 6 connects the active gear 41 and the output shaft 2. Correspondingly, the transmission ratio of the first input gear 11 and the active ring gear 31 is different from the transmission ratio of the second input gear 12 and the active gear 41. In this embodiment, the first input gear 11 and the second input gear 12 are shown to have the same diameter.

[0027] Reference Figure 1 As shown, specifically, in order to achieve the purpose of unidirectional power transmission of the first unidirectional transmission structure 5, the first unidirectional transmission structure 5 includes a first spline hub 51 and a first unidirectional transmission member 52. The first spline hub 51 is coaxially arranged with the output shaft 2 and is connected to the active ring gear 31 through the first unidirectional transmission member 52. When the reverse gear function is not designed, the first spline hub 51 can be directly fixed to the output shaft 2. At this time, the power transmitted by the first reduction mechanism 3 is directly transmitted to the first spline hub 51 and the output shaft 2 through the first unidirectional transmission member 52.

[0028] Reference Figure 1As shown, in this embodiment, considering the design of the reverse gear function, the first spline hub 51 can be selectively connected to the output shaft 2 through the shift mechanism 7 to transmit power or disconnected to disconnect the power transmission. At the same time, the two-speed transmission mechanism also includes a reverse gear transmission mechanism 8, whose input end is connected to the input shaft 1, and whose output end can be selectively connected to the output shaft 2 through the shift mechanism 7 to transmit power or disconnected to disconnect the power transmission. The input shaft 1 drives the output shaft 2 to rotate in the second rotation direction through the first reduction mechanism 3 and the first one-way transmission structure 5. When the input shaft 1 rotates in the first rotation direction, and the shift mechanism 7 disconnects the first spline hub 51 from the output shaft 2 and connects the reverse gear transmission mechanism 8 to the output shaft 2, the output shaft 2 is driven to rotate in the direction opposite to the second rotation direction through the reverse gear transmission mechanism 8, and the rotation speed of the output shaft 2 is not greater than the rotation speed of the driving gear 41.

[0029] Through the above arrangement, when the first spline hub 51 is connected to the output shaft 2 through the shift mechanism 7, and the output end of the reverse gear transmission mechanism 8 is disconnected from the output shaft 2, the power output by the first reduction mechanism 3 can be transmitted to the output shaft 2 to rotate the output shaft 2 after being transmitted to the first spline hub 51 through the first one-way transmission member 52, thereby realizing the power output under this gear position, and the power transmission between the reverse gear transmission mechanism 8 and the output shaft 2 is disconnected. When the first spline hub 51 is disconnected from the output shaft 2 through the shift mechanism 7, and the output end of the reverse gear transmission mechanism 8 is connected to the output shaft 2, the power transmission between the first spline hub 51 and the output shaft 2 is disconnected, that is, the power transmission between the first reduction mechanism 3 and the output shaft 2 is disconnected, and the power output of the input shaft 1 is input into the reverse gear transmission mechanism 8, and then input into the output shaft 2 through the shift mechanism 7, so that the output shaft 2 rotates in the opposite direction, thereby realizing the purpose of reverse gear power output. And when the transmission structure connects the first spline hub 51 and the reverse gear transmission mechanism 8 to the output shaft 2, the output shaft 2 can be locked and cannot rotate, thereby realizing the parking function.

[0030] Reference Figure 1 As shown, the rotation speed of the output shaft 2 is not greater than the rotation speed of the driving gear 41. Taking the input shaft 1 as a reference system, the driving gear 41 rotates relative to the output shaft 2 in a direction opposite to the second rotation direction. At this time, the second one-way transmission structure 6 does not work, thereby avoiding the mechanism from getting stuck.

[0031] Reference Figure 1As shown, the reverse gear transmission mechanism 8 includes a reverse gear 81 coaxially arranged with the output shaft 2, the reverse gear 81 meshes with the first input gear 11, and the shift mechanism 7 connects the reverse gear 81 and the output shaft 2. Specifically, the reverse gear transmission mechanism 8 includes a third spline hub 82 coaxially fixed with the reverse gear 81, and the third spline hub 82 can be selectively connected to or disconnected from the output shaft 2 through the shift mechanism 7. At this time, in order to avoid the mechanism from getting stuck during reverse gear, the transmission ratio of the first input gear 11 and the reverse gear 81 must not be less than the transmission ratio of the second input gear 12 and the driving gear 41. In this embodiment, since the first input gear 11 and the second input gear 12 have the same diameter, the outer diameter of the reverse gear 81 and the driving gear 41 are the same.

[0032] Reference Figure 1 As shown, the shift mechanism 7 includes a shift gear 71 and a shift sliding engagement sleeve 72. The shift gear 71 is coaxially fixed with the output shaft 2, and the shift sliding engagement sleeve 72 is coaxial with and meshed with the shift gear 71, and the shift sliding engagement sleeve 72 can move axially relative to the shift gear 71. Correspondingly, the shift sliding engagement sleeve 72 can slide to mesh with the first spline hub 51 and the third spline hub 82, respectively or simultaneously, to achieve first gear power output, reverse gear power output and parking functions.

[0033] Reference Figure 1 As shown, further, the first reduction mechanism 3 also includes a second spline hub 32 coaxially fixed with the active ring gear 31, and the first one-way transmission structure 5 connects the second spline hub 32 and the output shaft 2, that is, the first one-way transmission member 52 connects the first spline hub 51 and the second spline hub 32.

[0034] Reference Figure 1 As shown, in order to achieve the purpose of unidirectional power transmission of the second unidirectional transmission structure 6, the second unidirectional transmission structure 6 includes a second unidirectional transmission member 61 and a fourth spline hub 62 coaxially fixed to the driving gear 41, and the second unidirectional transmission member 61 connects the fourth spline hub 62 and the output shaft 2.

[0035] Reference Figure 1 As shown, the first one-way transmission member 52 and the second one-way transmission member 61 both adopt one-way bearings.

[0036] Reference Figure 1As shown, further, since the one-way bearing cannot realize the function of transmitting power from the semi-axial motor 20, a first movable locking structure 9 and a second movable locking structure 10 are provided to achieve the purpose of energy recovery. Among them, the active ring gear 31 can be selectively connected to or disconnected from the output shaft 2 through the first movable locking structure 9. When the active ring gear 31 and the output shaft 2 are connected through the first movable locking structure 9, they are restricted from relative rotation, and can rotate relative to each other when they are disconnected. The active gear 41 can be selectively connected to or disconnected from the output shaft 2 through the second movable locking structure 10. When the active gear 41 and the output shaft 2 are connected through the second movable locking structure 10, they are restricted from relative rotation, and can rotate relative to each other when they are disconnected.

[0037] Through the above arrangement, when the active gear ring 31 is disconnected from the output shaft 2, the output power of the active gear ring 31 is transmitted to the output shaft 2 through the first one-way transmission structure 5, that is, the power transmission from the motor 20 to the half-axis direction can be carried out normally in this gear, but the power transmission from the half-axis to the motor 20 direction cannot be realized. When the active gear ring 31 is connected to the output shaft 2 through the first movable locking structure 9, the active gear ring 31 and the output shaft 2 are restricted from relative rotation, and the power can be transmitted from the half-axis to the motor 20 direction, so as to achieve the purpose of energy recovery in this gear. Similarly, when the active gear 41 is disconnected from the output shaft 2, the output power of the active gear 41 is transmitted to the output shaft 2 through the second one-way transmission structure 6, and when the active gear ring 31 is connected to the output shaft 2 through the second movable locking structure 10, the active gear ring 31 and the output shaft 2 are restricted from relative rotation, and the power can be transmitted from the half-axis to the motor 20 direction, so as to achieve the purpose of energy recovery in this gear. The function of energy recovery of the transmission mechanism can be realized.

[0038] Reference Figure 1 As shown, specifically, the first movable locking structure 9 includes a first locking gear 91 and a first sliding engagement sleeve 92, the first locking gear 91 is coaxially fixed with the output shaft 2, the first sliding engagement sleeve 92 is coaxially meshed with the first locking gear 91, and the first sliding engagement sleeve 92 can slide relative to the first locking gear 91 in the axial direction to mesh with or disengage from the second spline hub 32, so as to achieve the purpose of connecting or disengaging the second spline hub 32 from the output shaft 2. Correspondingly, the second movable locking structure 10 includes a second locking gear 101 and a second sliding engagement sleeve 102, the second locking gear 101 is coaxially fixed with the output shaft 2, the second sliding engagement sleeve 102 is coaxially meshed with the second locking gear 101, and the second sliding engagement sleeve 102 can slide relative to the second locking gear 101 in the axial direction to mesh with or disengage from the fourth spline hub 62, so as to achieve the purpose of connecting or disengaging the fourth spline hub 62 from the output shaft 2.

[0039] Reference Figure 1As shown, in this embodiment, the first spline hub 51 is coaxially sleeved outside the output shaft 2, the second spline hub 32 is coaxially sleeved outside the first spline hub 51, the third spline hub 82 is coaxially sleeved outside the second spline hub 32, the fourth spline hub 62 is coaxially sleeved outside the output shaft 2, the reverse gear 81 is coaxially sleeved outside the third spline hub 82, and the driving gear 41 is coaxially sleeved outside the fourth spline hub 62.

[0040] The two-speed transmission mechanism of this embodiment can realize the power output function of the two gears, the reverse gear function and the parking function through the above-mentioned arrangement, and can also realize the energy recovery function.

[0041] Reference Figure 1-2 As shown, this embodiment also provides a two-speed electric drive assembly, which includes the two-speed transmission mechanism described above.

[0042] Reference Figure 2 As shown, specifically, it also includes a motor 20 and a differential 30, the output shaft 2 of the motor 20 and the input shaft 1 are coaxially fixed to input power, the rotating shaft of the differential 30 housing is parallel to the output shaft 2, and the housing of the differential 30 is coaxially fixedly connected with a driven gear 301, and the output shaft 2 is coaxially fixedly connected with an output gear 21, and the output gear 21 is meshed with the driven gear 301 to realize the function of output shaft 2 outputting power to the differential 30. During actual installation, the input shaft 1, the output shaft 2 and the differential 30 housing are rotatably connected to the bridge housing through bearings.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-speed transmission mechanism, characterized in that: include: An input shaft (1) and an output shaft (2) having parallel axes; A first reduction mechanism (3) and a second reduction mechanism (4) having different reduction ratios, wherein the input end of the first reduction mechanism (3) is connected to the input shaft (1) and the output end is connected to the output shaft (2) via a first one-way transmission structure (5), and the input end of the second reduction mechanism (4) is connected to the input shaft (1) and the output end is connected to the output shaft (2) via a second one-way transmission structure (6); When the input shaft (1) rotates in a first rotation direction, the first reduction mechanism (3) transmits the power of the input shaft (1) to the output shaft (2) through the first one-way transmission structure (5), and the second one-way transmission structure (6) disconnects the power transmission between the second reduction mechanism (4) and the input shaft (1); when the input shaft (1) rotates in the opposite direction, the second reduction mechanism (4) transmits the power of the input shaft (1) to the output shaft (2) through the second one-way transmission structure (6), and the first one-way transmission structure (5) disconnects the power transmission between the second reduction mechanism (4) and the input shaft (1); when the input shaft (1) rotates in the first rotation direction or rotates in the opposite direction, the direction in which the output shaft (2) is driven to rotate is the same.

2. The two-speed transmission mechanism according to claim 1, characterized in that: The input shaft (1) is provided with a first input gear (11) and a second input gear (12); the first reduction mechanism (3) comprises an active ring gear (31) coaxially arranged with the output shaft (2); the first input gear (11) is located inside the active ring gear (31) and meshes with the active ring gear (31); and the first one-way transmission structure (5) connects the active ring gear (31) and the output shaft (2); The second speed reduction mechanism (4) comprises a driving gear (41) coaxially arranged with the output shaft (2), the driving gear (41) meshing with the second input gear (12), and the second one-way transmission structure (6) connecting the driving gear (41) and the output shaft (2).

3. The two-speed transmission mechanism according to claim 2, characterized in that: The active gear ring (31) can be selectively connected to or disconnected from the output shaft (2) via a first movable locking structure (9); the active gear ring (31) and the output shaft (2) are restricted from relative rotation when connected via the first movable locking structure (9), and can rotate relative to each other when disconnected.

4. The two-speed transmission mechanism according to claim 2, characterized in that: The driving gear (41) can be selectively connected to or disconnected from the output shaft (2) via a second movable locking structure (10); the driving gear (41) and the output shaft (2) are restricted from relative rotation when connected via the second movable locking structure (10), and can rotate relative to each other when disconnected.

5. The two-speed transmission mechanism according to claim 2, characterized in that: The first one-way transmission structure (5) comprises a first spline hub (51) and a first one-way transmission member (52); the first spline hub (51) is coaxially arranged with the output shaft (2) and connected to the active gear ring (31) via the first one-way transmission member (52); the first spline hub (51) can be selectively connected to the output shaft (2) to transmit power or disconnected to disconnect power transmission via a shifting mechanism (7).

6. The two-speed transmission mechanism according to claim 5, characterized in that: It also includes a reverse gear transmission mechanism (8), the input end of which is connected to the input shaft (1), and the output end of which can be selectively connected to the output shaft (2) through the shift mechanism (7) to transmit power or disconnected to disconnect power transmission, and the input shaft (1) drives the output shaft (2) to rotate in a second rotation direction through the first reduction mechanism (3) and the first one-way transmission structure (5); When the input shaft (1) rotates in a first rotation direction and the shift mechanism (7) disconnects the first spline hub (51) from the output shaft (2) and connects the reverse gear transmission mechanism (8) to the output shaft (2), the output shaft (2) is driven to rotate in a direction opposite to the second rotation direction by the reverse gear transmission mechanism (8), and the rotation speed of the output shaft (2) is not greater than the rotation speed of the driving gear (41).

7. The two-speed transmission mechanism according to claim 6, characterized in that: The reverse gear transmission mechanism (8) comprises a reverse gear (81) coaxially arranged with the output shaft (2), the reverse gear (81) meshing with the first input gear (11), and the shifting mechanism (7) connecting the reverse gear (81) and the output shaft (2).

8. The two-speed transmission mechanism according to claim 3, characterized in that: The first reduction mechanism (3) comprises a second spline hub (32) coaxially fixed to the driving gear ring (31), and the first one-way transmission structure (5) connects the second spline hub (32) and the output shaft (2); The first movable locking structure (9) comprises a first locking gear (91) and a first sliding engagement sleeve (92); the first locking gear (91) is coaxially fixed to the output shaft (2); the first sliding engagement sleeve (92) is coaxially engaged with the first locking gear (91); and the first sliding engagement sleeve (92) can slide axially relative to the first locking gear (91) to engage with or disengage from the second spline hub (32).

9. The two-speed transmission mechanism according to claim 5, characterized in that: The first one-way transmission member (52) comprises a one-way bearing.

10. A two-speed electric drive assembly, characterized in that: It comprises a two-speed transmission mechanism as claimed in any one of claims 1 to 9.

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