Two-gear double-motor electric drive transmission device without power interruption

Abstract

The invention provides a two-gear double-motor electric drive transmission device without power interruption. The two-gear double-motor electric drive transmission device without power interruption comprises a first power unit, a first gear shifting mechanism, an input unit, a coupling unit, a second gear shifting mechanism, a speed reduction unit and an output unit which are sequentially connected, and further comprises a second power unit connected with the coupling unit. The input unit comprises a normally-open route and a gear shifting route, the first power unit is connected with the normally-open route or the gear shifting route through the first gear shifting mechanism, the coupling unit comprises a deceleration route and a direct drive route, the normally-open route is connected with the deceleration route, and the gear shifting route is connected with the direct drive route. According to the two-gear double-motor electric drive transmission device without power interruption, the defects that an existing electric drive axle is complex in structure, high in cost and the like in order to guarantee no power interruption are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to electric drive axle, in particular to a two-gear dual-motor electric drive transmission device without power interruption. BACKGROUND

[0002] The trend of commercial vehicle electric drive is more and more obvious, and the penetration rate is higher. The power required by commercial vehicles is larger than that of passenger cars, and more torque and power are required, and even multi-gear transmission device is required. Electric drive is directly installed on the axle to drive the wheels, some of which use high-power single motor or low-power dual motor. In order to realize multi-gear coupling, there are many transmission configuration schemes. In the commonly used dual-motor electric drive axle scheme, the gear is shifted after power coupling, so the power of the two motors is interrupted during gear shifting, which has a great influence on the power of commercial vehicles. In order to ensure no power interruption, the commonly used solution is to add a gear shifting mechanism before the dual-motor power coupling, but it also causes the defects of more parts and complex structure. The double axle combination can meet the whole vehicle without power interruption, but the cost is higher, which is not suitable for vehicles designed with only single axle, and the use range is limited. SUMMARY

[0003] In order to solve the defects of complex structure and high cost in the existing electric drive axle to ensure no power interruption, the present application provides a two-gear dual-motor electric drive transmission device without power interruption to solve the above problems.

[0004] A two-gear dual-motor electric drive transmission device without power interruption, comprising a first power unit, a first gear shifting mechanism, an input unit, a coupling unit, a second gear shifting mechanism, a reduction unit and an output unit connected in sequence, and a second power unit connected to the coupling unit; the input unit comprises a constant path route and a gear shifting route, the first power unit is connected to the constant path route or the gear shifting route through the first gear shifting mechanism, the coupling unit comprises a reduction route and a direct drive route, the constant path route is connected to the reduction route, the gear shifting route is connected to the direct drive route, one of the reduction route and the direct drive route is connected to the reduction unit, and the other is connected to the reduction unit through the second gear shifting mechanism.

[0005] In a preferred embodiment of the two-gear dual-motor electric drive transmission device without power interruption provided by the present application, the first power unit comprises a first motor, and the first motor is connected to the constant path route or the gear shifting route through the first gear shifting mechanism; or comprises a first intermediate shaft and a first motor, the first motor is connected to the first intermediate shaft, and the first intermediate shaft is connected to the constant path route or the gear shifting route through the first gear shifting mechanism.

[0006] The second power unit comprises a second motor connected to the deceleration route; or comprises a second intermediate shaft and a second motor connected to the second intermediate shaft, and the second intermediate shaft is connected to the deceleration route.

[0007] In a preferred embodiment of the two-gear dual-motor electric drive transmission device without power interruption provided by the application, the input unit comprises a double-layer shaft, the inner layer shaft of which serves as the always-on route, and the outer layer shaft serves as the gear shifting route. The coupling unit comprises a double-layer gear, the inner layer gear and the outer layer gear of which can serve as the deceleration route or the direct drive route.

[0008] In a preferred embodiment of the two-gear dual-motor electric drive transmission device without power interruption provided by the application, the deceleration unit comprises a planetary gear set, the deceleration route directly drives the sun gear of the deceleration unit, or drives the sun gear of the deceleration unit through the second gear shifting mechanism, the direct drive route directly drives the planet carrier of the deceleration unit, or drives the planet carrier of the deceleration unit through the second gear shifting mechanism, and the planet carrier of the deceleration unit is connected to the output unit.

[0009] In a preferred embodiment of the two-gear dual-motor electric drive transmission device without power interruption provided by the application, the inner layer gear directly drives the sun gear of the deceleration unit, the outer layer gear drives the planet carrier of the deceleration unit through the second gear shifting mechanism, and the second gear shifting mechanism fixes the ring gear of the deceleration unit or fixes the ring gear and the planet carrier.

[0010] The inner layer gear directly drives the planet carrier of the deceleration unit, the outer layer gear drives the sun gear of the deceleration unit through the second gear shifting mechanism, and the second gear shifting mechanism connects the sun gear of the deceleration unit and the outer layer gear, or connects the sun gear of the deceleration unit and the inner layer gear.

[0011] In a preferred embodiment of the two-gear dual-motor electric drive transmission device without power interruption provided by the application, the output unit comprises a differential.

[0012] A gear shifting method based on the two-gear dual-motor electric drive transmission device without power interruption, in the initial state, the first power unit is connected to the always-on route and the deceleration route in turn, the second power unit is also connected to the deceleration route, after the power coupling of the two, the second gear shifting mechanism is used to drive the deceleration unit in one gear or two gears, and finally output from the output unit to the two sides of the vehicle; in this state, the following steps are included: Step 1: the first power unit is shut down, at this time the first gear shifting mechanism is without power and can be operated for gear shifting, and the first gear shifting mechanism is switched. Step 2: the first power unit starts, maintains power output, at this time power is driven to the output unit through the shift route and the direct drive route in turn; Step 3: the second power unit stops, at this time the second power unit has no power, the first power unit directly drives the reduction unit, the second shift mechanism does not transmit power and can be shifted, and the second shift mechanism switches; Step 4: the second power unit starts, maintains power output, at this time power is directly from the reduction route to drive the reduction unit; Step 5: at the same time, the first power unit stops, and the first shift mechanism switches, which is opposite to the shift direction in the operation described in step 1; Step 6: the first power unit starts, and the initial state is restored.

[0013] Compared with the prior art, the two-gear double-motor electric drive transmission device without power interruption provided by the application has the following beneficial effects: 1. The scheme provided by the application is a single-bridge double-motor layout, and a motor is always on and the other motor is switched in two routes, so that the two motors can alternately maintain power during shifting, thereby realizing no power interruption during shifting and enabling the product to meet single-bridge applications.

[0014] 2. In the scheme provided by the application, the shift mechanism is arranged after the double-motor power coupling, thereby reducing the number of parts, making the overall structure compact, small in size, and easier to install.

[0015] 3. In the scheme provided by the application, both motors can maintain power independently, and single-motor driving can be used under necessary working conditions, thereby improving the efficiency of the electric drive bridge. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the two-gear double-motor electric drive transmission device without power interruption in embodiment 1; Figure 2 is a schematic diagram of the two-gear double-motor electric drive transmission device without power interruption in embodiment 2; Figure 3 is a schematic diagram of the two-gear double-motor electric drive transmission device without power interruption in embodiment 3; Figure 4 is a schematic diagram of the two-gear double-motor electric drive transmission device without power interruption in embodiment 4; Figure 5 is a schematic diagram of the two-gear double-motor electric drive transmission device without power interruption in embodiment 5; Figure 6 is a schematic diagram of the two-gear double-motor electric drive transmission device without power interruption in embodiment 6; Figure 7is the schematic diagram of the two-gear double-motor electric drive device without power interruption in embodiment 7.

[0017] Reference numerals in the figure: first power unit 1, first spline 11, first intermediate shaft 12, second power unit 2, second intermediate shaft 21, first shift mechanism 3, second shift mechanism 4, inner layer shaft 51, outer layer shaft 52, inner layer spline 53, outer layer spline 54, second outer layer shaft 55, middle layer shaft 56, inner layer tooth 61, outer layer tooth 62, two-gear spline 63, reduction unit 7, gear ring spline 71, one-gear spline 72, differential 81, wheel-side reducer 82. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0019] Embodiment 1, please refer to Figure 1 is the schematic diagram of the two-gear double-motor electric drive device without power interruption provided by the present application in the present embodiment.

[0020] The two-gear double-motor electric drive device without power interruption comprises a first power unit 1, a second power unit 2, a first shift mechanism 3, a second shift mechanism 4, an input unit, a coupling unit, a reduction unit 7 and an output unit.

[0021] The first power unit 1 comprises a first motor, and the first motor shaft end is provided with a first spline 11. The input unit comprises a double-layer shaft, wherein the right end of the inner layer shaft 51 is provided with an inner layer spline 53, and the right end of the outer layer shaft 52 is provided with an outer layer spline 54. The input unit is coaxially aligned with the first motor, and the first spline 11, the inner layer spline 53 and the outer layer spline 54 are arranged in sequence from right to left.

[0022] The sliding sleeve of the first shift mechanism 3 is driven by another control mechanism to make the first spline 11 engage with the inner layer spline 53 or the outer layer spline 54. When the first spline 11 engages with the inner layer spline 53, i.e. when power is transmitted through the inner layer shaft 51, it is the normal output route; when it engages with the outer layer spline 54, it is the shift route that needs to be adopted during shifting.

[0023] The coupling unit comprises a double-layer tooth, wherein the inner layer tooth 61 is on the left and engages with the inner layer shaft 51 through a gear, and the outer layer tooth 62 is on the right and engages with the outer layer shaft 52 through a gear.

[0024] The second power unit 2 comprises a second motor, and the shaft end of the second motor is provided with a motor pinion that also engages with the inner layer tooth 61 through a gear.

[0025] The reduction unit 7 comprises a planetary gear set. The inner layer teeth 61 are connected to the sun gear of the reduction unit 7, and the outer layer teeth 62 are connected to the planet carrier of the reduction unit 7, which is further connected to the output unit. In this structure, when power is transmitted through the inner layer teeth 61, the power is transmitted after being reduced by the reduction unit 7, which is referred to as the reduction route; when power is transmitted through the outer layer teeth 62, the power directly drives the rotation of the entire reduction unit 7, which is referred to as the direct drive route.

[0026] The two-gear spline 63 is arranged outside the central shaft of the outer layer teeth 62, the gear ring spline 71 is arranged outside the gear ring of the reduction unit 7, and the one-gear spline 72 is arranged on the electric drive axle housing.

[0027] The sleeve of the second gear shifting mechanism 4 is controlled by the additional control mechanism to engage the gear ring spline 71 with the one-gear spline 72 or the two-gear spline 63. When the gear ring spline 71 engages with the one-gear spline 72, the gear ring of the reduction unit 7 is fixed, and when power is transmitted through the normal route, the power is transmitted after being reduced by the reduction unit 7, which is referred to as the low-speed first gear; when the gear ring spline 71 engages with the two-gear spline 63, the gear ring of the reduction unit 7 is fixed with the planet carrier, and when power is transmitted through the normal route, the power directly drives the rotation of the entire reduction unit 7, which is referred to as the high-speed second gear.

[0028] The output unit comprises a differential 81, left and right half shafts connected to the differential 81, and wheel edge reducers 82 arranged at the ends of the left and right half shafts, respectively. The planet carrier of the reduction unit 7 is connected to the housing of the differential 81.

[0029] In the above structure, the initial driving route is as follows: The first motor drives the inner layer shaft 51 through the first gear shifting mechanism 3, and drives the sun gear of the reduction unit 7 through the inner layer teeth 61. The second motor is connected to the inner layer teeth 61, and drives the sun gear of the reduction unit 7 together. At this time, the second gear shifting mechanism 4 can be either the first gear or the second gear. The planet carrier of the reduction unit 7 drives the housing of the differential 81, the differential 81 distributes power to the left half shaft 82 and the right half shaft 83, and finally transmits the power to the wheels on both sides.

[0030] When gear shifting is needed, the gear shifting method comprises the following steps: Step 1: The first motor is stopped, at this time the first gear shifting mechanism 3 has no power, and the gear shifting operation can be performed, and the first gear spline 11 is switched to engage with the outer layer spline 54.

[0031] Step 2: The first motor is started, at this time its power is sequentially transmitted through the outer layer shaft 52, the outer layer teeth 62, the planet carrier of the reduction unit 7, and directly drives the housing of the differential 81.

[0032] Step 3: The second motor is stopped, at this time only the power of the first motor directly drives the planetary carrier of the reduction unit 7, the reduction unit 7 itself does not transmit power, the second shift mechanism 4 can perform a shift operation and switch to another gear, assuming that it is switched to second gear.

[0033] Step 4: The second motor is started, at this time the power output of the second motor is consistent with the initial state, driving the sun gear of the reduction unit 7 from the inner teeth 61.

[0034] Step 5: At the same time, the first motor is stopped, similar to step 1, the first shift mechanism 3 switches back to the first spline 11 engaging with the inner spline 53.

[0035] Step 6: The first motor is started, returning to the initial state.

[0036] Example 2, please refer to Figure 2 , the two-gear dual-motor electric drive transmission device without power interruption provided by the application in this embodiment.

[0037] The two-gear dual-motor electric drive transmission device without power interruption includes a first power unit 1, a second power unit 2, a first shift mechanism 3, a second shift mechanism 4, an input unit, a coupling unit, a reduction unit 7, and an output unit.

[0038] The first power unit 1 includes a first motor and a first intermediate shaft 12. The shaft end of the first motor is provided with a motor pinion, which is engaged with the right end of the first intermediate shaft 12 through a gear. The left end of the first intermediate shaft 12 is provided with a first spline 11. The input unit includes a double-layer shaft, wherein the right end of the inner shaft 51 is provided with an inner spline 53, and the right end of the outer shaft 52 is provided with an outer spline 54. The input unit is coaxially aligned with the first intermediate shaft 12, and the first spline 11, the inner spline 53, and the outer spline 54 are arranged from right to left in sequence. The other contents are consistent with example 1.

[0039] The scheme of this embodiment reduces the operating speed of the shift mechanism compared to the scheme of example 1, and can increase the transmission ratio of the first output, enabling more working condition applications.

[0040] Example 3, please refer to Figure 3 , the two-gear dual-motor electric drive transmission device without power interruption provided by the application in this embodiment.

[0041] The two-gear dual-motor electric drive transmission device without power interruption includes a first power unit 1, a second power unit 2, a first shift mechanism 3, a second shift mechanism 4, an input unit, a coupling unit, a reduction unit 7, and an output unit.

[0042] The first power unit 1 comprises a first motor. The input unit comprises a double-layer shaft, including an inner layer shaft 51, an outer layer shaft 52 and a second outer layer shaft 55. The shaft end of the first motor is provided with a motor pinion, which is engaged with the right end of the second outer layer shaft 55 through a gear.

[0043] The left end of the second outer layer shaft 55 is provided with a first spline 11. The right end of the inner layer shaft 51 is provided with an inner layer spline 53, and the right end of the outer layer shaft 52 is provided with an outer layer spline 54. The first spline 11, the inner layer spline 53 and the outer layer spline 54 are arranged in sequence from right to left.

[0044] The sleeve of the first gear shifting mechanism 3 is driven by another control mechanism to engage the first spline 11 with the inner layer spline 53 or the outer layer spline 54, respectively. When the first spline 11 is engaged with the inner layer spline 53, i.e. when power is transmitted through the inner layer shaft 51, it is the normal output route; when the first spline 11 is engaged with the outer layer spline 54, it is the gear shifting route that needs to be adopted during gear shifting.

[0045] The coupling unit comprises a double-layer tooth, wherein the inner layer tooth 61 is on the left and is engaged with the left end of the outer layer shaft 52 through a gear, and the outer layer tooth 62 is on the right and is engaged with the right end of the inner layer shaft 51 through a gear. The second power unit comprises a second motor and a second intermediate shaft 21. The shaft end of the second motor is provided with a motor pinion, which is engaged with the left end of the second intermediate shaft 21 through a gear, and the right end of the second intermediate shaft 21 is further engaged with the outer layer tooth 62 through a gear.

[0046] The reduction unit 7 comprises a planetary gear train. The outer layer tooth 62 is on the right and is connected to the sun gear of the reduction unit 7 through the second gear shifting mechanism 4. The planet carrier of the reduction unit 7 is also connected to the output unit, and the ring gear of the reduction unit 7 is fixed. The inner layer tooth 61 is on the right and passes through the sun gear of the reduction unit 7 until it is connected to the output unit. In this structure, when power is transmitted through the inner layer tooth 61, the power directly drives the whole reduction unit 7 to rotate, which is recorded as the direct drive route; when power is transmitted through the outer layer tooth 62, the power is transmitted after being decelerated by the reduction unit 7, which is recorded as the deceleration route.

[0047] A drive spline 64 is arranged outside the central shaft of the outer layer tooth 62, a first gear spline 72 is arranged outside the sun gear of the reduction unit 7, and a second gear spline 63 is arranged on the central shaft of the inner layer tooth 61 between the drive spline 64 and the first gear spline 72. That is, the drive spline 64, the second gear spline 63 and the first gear spline 72 are arranged in sequence from left to right.

[0048] The sleeve of the second shift mechanism 4 is under the action of another control mechanism, and the driving spline 64 is engaged with the first spline 72 or the second spline 63. When the driving spline 64 is engaged with the first spline 72, the outer spline 62 is connected to the sun gear of the reduction unit 7, and when the power is transmitted in the normal route, the power is transmitted after being reduced by the reduction unit 7, that is, the low-speed first gear; when the driving spline 64 is engaged with the second spline 63, the outer spline 62 is connected to the inner spline 61 and the output unit, and when the power is transmitted in the normal route, the power directly drives the output unit, that is, the high-speed second gear.

[0049] The output unit includes a differential 81, left and right half shafts connected to the differential 81, and wheel edge reducers 82 respectively arranged at the ends of the left and right half shafts. The inner spline 61 and the planet carrier of the reduction unit 7 are both connected to the differential 81 housing.

[0050] Under the above structure, the initial driving route is: The first motor drives the inner shaft 51 and the outer spline 62 through the first shift mechanism 3, and the second motor is also connected to the outer spline 62. From the outer spline 62, the first gear of the second shift mechanism 4 drives the sun gear of the reduction unit 7, and the power is transmitted by the planet carrier of the reduction unit 7 after being reduced by the reduction unit 7, or the second gear directly drives the differential 81 housing. The differential 81 distributes the power to the left half shaft 82 and the right half shaft 83, and finally transmits the power to the wheels on both sides.

[0051] When gear shifting is needed, the gear shifting method includes the following steps: Step 1: The first motor is stopped, at this time the first shift mechanism 3 has no power, and the gear shifting operation can be performed, and the first spline 11 is switched to engage with the outer spline 54.

[0052] Step 2: The first motor is started, at this time the power of the first motor is transmitted to the differential 81 housing through the outer shaft 52 and the inner spline 61 in sequence.

[0053] Step 3: The second motor is stopped, at this time only the power of the first motor directly drives the differential 81, and the reduction unit 7 does not transmit power itself, and the second shift mechanism 4 can perform gear shifting operation and switch to another gear, assuming that it is switched to the second gear.

[0054] Step 4: The second motor is started, at this time the power output of the second motor is consistent with the initial state, and the differential 81 is driven from the outer spline 62.

[0055] Step 5: At the same time, the first motor is stopped, and the first shift mechanism 3 is switched back to the first spline 11 engaging with the inner spline 53, similar to step 1.

[0056] Step 6: The first motor is started, and the initial state is restored.

[0057] Example 4, please refer to Figure 4, is the schematic diagram of the two-gear double-motor electric drive transmission device without power interruption provided by the application in the embodiment.

[0058] The two-gear double-motor electric drive transmission device without power interruption comprises a first power unit 1, a second power unit 2, a first gear shifting mechanism 3, a second gear shifting mechanism 4, an input unit, a coupling unit, a reduction unit 7 and an output unit.

[0059] The output unit comprises a differential 81, and left and right half shafts are connected to the differential 81. Other contents are consistent with those of Embodiment 3. The wheel-side reducer is cancelled compared with Embodiment 3.

[0060] Embodiment 5, please refer to Figure 5 , is the schematic diagram of the two-gear double-motor electric drive transmission device without power interruption provided by the application in the embodiment.

[0061] The two-gear double-motor electric drive transmission device without power interruption comprises a first power unit 1, a second power unit 2, a first gear shifting mechanism 3, a second gear shifting mechanism 4, an input unit, a coupling unit, a reduction unit 7 and an output unit.

[0062] The first power unit 1 comprises a first motor. The input unit comprises three layers of shafts, including an inner layer shaft 51, an outer layer shaft 52 and a middle layer shaft 56. The first motor is provided with a motor pinion at the shaft end, which is engaged with the right end of the middle layer shaft 56 through a gear.

[0063] The left end of the middle layer shaft 56 is provided with a first spline 11. The left end of the inner layer shaft 51 is provided with an inner layer spline 53, and the left end of the outer layer shaft 52 is provided with an outer layer spline 54. The inner layer spline 53, the first spline 11 and the outer layer spline 54 are arranged in sequence from left to right.

[0064] The sliding sleeve of the first gear shifting mechanism 3 is driven by another control mechanism to make the first spline 11 engage with the inner layer spline 53 or the outer layer spline 54, respectively. When the first spline 11 engages with the inner layer spline 53, that is, when the power is transmitted through the inner layer shaft 51, it is the normal output route; when the first spline 11 engages with the outer layer spline 54, it is the gear shifting route which is only needed during gear shifting.

[0065] The coupling unit comprises double-layer teeth, wherein the inner layer teeth 61 are on the left and engaged with the right end of the outer layer shaft 52 through a gear, and the outer layer teeth 62 are on the right and engaged with the right end of the inner layer shaft 51 through a gear. Other contents are consistent with those in Embodiment 3.

[0066] The scheme of the embodiment is more compact in structure than that of Embodiment 3, can reduce the length of the differential case, makes the installation more convenient, and is suitable for more use scenarios.

[0067] Embodiment 6, please refer to Figure 6 , is the schematic diagram of the two-gear double-motor electric drive transmission device without power interruption provided by the application in the embodiment.

[0068] The two-gear dual-motor electric drive transmission without power interruption includes a first power unit 1, a second power unit 2, a first gear shifting mechanism 3, a second gear shifting mechanism 4, an input unit, a coupling unit, a reduction unit 7 and an output unit.

[0069] The output unit includes a differential 81 connected to left and right half shafts inside the differential 81. Other contents are consistent with those of Embodiment 5. The wheel-side reducer is cancelled compared with Embodiment 5.

[0070] Embodiment 7, please refer to Figure 7 The two-gear dual-motor electric drive transmission without power interruption provided by the present application in this embodiment.

[0071] The two-gear dual-motor electric drive transmission without power interruption includes a first power unit 1, a second power unit 2, a first gear shifting mechanism 3, a second gear shifting mechanism 4, an input unit, a coupling unit, a reduction unit 7 and an output unit.

[0072] The first power unit 1 includes a first motor. The input unit includes a double-layer shaft including an inner layer shaft 51, an outer layer shaft 52 and a second outer layer shaft 55. The shaft end of the first motor is provided with a motor pinion gear meshing with the left end of the second outer layer shaft 55 through a gear.

[0073] The right end of the second outer layer shaft 55 is provided with a first spline 11. The middle position of the inner layer shaft 51 is provided with an inner layer spline 53, and the left end of the outer layer shaft 52 is provided with an outer layer spline 54. The first spline 11, the inner layer spline 53 and the outer layer spline 54 are arranged in sequence from left to right.

[0074] The sleeve of the first gear shifting mechanism 3 is controlled by another control mechanism to make the first spline 11 engage with the inner layer spline 53 or the outer layer spline 54. When the first spline 11 engages with the inner layer spline 53, i.e. when power is transmitted through the inner layer shaft 51, it is the normal output route; when the first spline 11 engages with the outer layer spline 54, it is the gear shifting route which is only needed during gear shifting.

[0075] The coupling unit includes a double-layer gear, in which the inner layer gear 61 is on the left and meshes with the left end of the inner layer shaft 51 through a gear, and the outer layer gear 62 is on the right and meshes with the right end of the outer layer shaft 52 through a gear. The second power unit includes a second motor and a second intermediate shaft 21. The shaft end of the second motor is provided with a motor pinion gear meshing with the right end of the second intermediate shaft 21, and the left end of the second intermediate shaft 21 further meshes with the inner layer gear 61 through a gear.

[0076] The reduction unit 7 includes a planetary gear train. The inner layer gear 61 is on the right and is connected to the sun gear of the reduction unit 7 through the second gear shifting mechanism 4. The outer layer gear 62 is on the right and is directly connected to the planetary carrier of the reduction unit 7. The planetary carrier of the reduction unit 7 is connected to the output unit, and the ring gear is fixed.

[0077] In this structure, when power is transmitted through the inner teeth 61, the power is transmitted after being decelerated by the deceleration unit 7, which is recorded as the deceleration route. When power is transmitted through the outer teeth 62, the power directly drives the deceleration unit 7 as a whole to rotate, which is recorded as the direct drive route.

[0078] A driving spline 64 is arranged outside the central shaft of the inner teeth 61. A first gear spline 72 is arranged outside the sun gear of the deceleration unit 7. The planet carrier of the deceleration unit 7 is arranged on one side of the coupling unit and is provided with a second gear spline 63 extending inwardly between the driving spline 64 and the first gear spline 72. That is, the driving spline 64, the second gear spline 63 and the first gear spline 72 are arranged in sequence from left to right.

[0079] The sliding sleeve of the second gear shifting mechanism 4 is controlled by the other control mechanism to engage the driving spline 64 with the first gear spline 72 or the second gear spline 63, respectively. When the driving spline 64 engages with the first gear spline 72, the inner teeth 61 are connected to the sun gear of the deceleration unit 7, and when power is transmitted in the normal route, the power is transmitted after being decelerated by the deceleration unit 7, that is, the low-speed first gear. When the driving spline 64 engages with the second gear spline 63, the inner teeth 61 are connected to the planet carrier of the deceleration unit 7, and when power is transmitted in the normal route, the power directly drives the output unit, that is, the high-speed second gear.

[0080] The output unit includes a differential 81 connected to the left and right half shafts inside the differential 81. The planet carrier of the deceleration unit 7 is connected to the housing of the differential 81.

[0081] In the above structure, the initial driving route is as follows: The first motor drives the inner shaft 51 and the inner teeth 61 through the first gear shifting mechanism 3, and the second motor is also connected to the inner teeth 61. From the inner teeth 61, the sun gear of the deceleration unit 7 is driven through the first gear of the second gear shifting mechanism 4, and the differential 81 housing is driven by the planet carrier of the deceleration unit 7 after being decelerated by the deceleration unit 7, or the second gear directly drives the differential 81 housing. The differential 81 distributes power to the left half shaft 82 and the right half shaft 83, and finally to the wheels on both sides.

[0082] When gear shifting is needed, the gear shifting method includes the following steps: Step 1: The first motor is stopped, at this time the first gear shifting mechanism 3 has no power, the gear shifting operation can be performed, and the first gear 11 is switched to engage with the outer gear 54.

[0083] Step 2: The first motor is started, at this time its power is transmitted in sequence through the outer shaft 52 and the outer teeth 62 to directly drive the differential 81 housing.

[0084] Step 3: The second motor is stopped, at this time only the power of the first motor directly drives the differential 81, the deceleration unit 7 does not transmit power itself, the second gear shifting mechanism 4 can perform gear shifting operation, and is switched to another gear, assuming that it is switched to the second gear.

[0085] Step 4: The second motor starts, at this time the power output of the second motor is consistent with the initial state, driving the differential 81 from the outer teeth 62.

[0086] Step 5: At the same time, the first motor stops, and the first shift mechanism 3 switches back to the first spline 11 engaging with the inner spline 53, similar to step 1.

[0087] Step 6: The first motor starts, returning to the initial state.

[0088] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A two-speed dual-motor electric drive transmission device with no power interruption, characterized in that: The system includes a first power unit, a first shifting mechanism, an input unit, a coupling unit, a second shifting mechanism, a deceleration unit, and an output unit connected in sequence, as well as a second power unit connected to the coupling unit. The input unit includes a normally open path and a shifting path. The first power unit is connected to the normally open path or the shifting path through the first shifting mechanism. The coupling unit includes a deceleration path and a direct drive path. The normally open path is connected to the deceleration path, and the shifting path is connected to the direct drive path. One of the deceleration path and the direct drive path is connected to the deceleration unit, and the other is connected to the deceleration unit through the second shifting mechanism.

2. The two-speed dual-motor electric drive transmission device with no power interruption according to claim 1, characterized in that: The first power unit includes a first motor, which is connected to the normally open route or the shift route via the first shift mechanism; or it includes a first intermediate shaft and a first motor, with the first motor connected to the first intermediate shaft, which is connected to the normally open route or the shift route via the first shift mechanism.

3. The two-speed dual-motor electric drive transmission device with no power interruption according to claim 1, characterized in that: The second power unit includes a second motor connected to the deceleration path; or includes a second intermediate shaft and a second motor connected to the second intermediate shaft, which in turn is connected to the deceleration path.

4. The two-speed dual-motor electric drive transmission device with no power interruption according to any one of claims 1 to 3, characterized in that: The input unit includes a dual-layer shaft, wherein the inner layer shaft serves as the normal-pass path and the outer layer shaft serves as the shift path.

5. The two-speed dual-motor electric drive transmission device with no power interruption according to claim 4, characterized in that: The coupling unit includes a double-layer tooth, wherein both the inner and outer teeth can serve as the deceleration path or the direct drive path.

6. The two-speed dual-motor electric drive transmission device with no power interruption according to claim 5, characterized in that: The reduction unit includes a planetary gear set. The reduction path directly drives or drives the sun gear of the reduction unit through the second shifting mechanism. The direct drive path directly drives or drives the planet carrier of the reduction unit through the second shifting mechanism. The planet carrier of the reduction unit is connected to the output unit.

7. The two-speed dual-motor electric drive transmission device with no power interruption according to claim 6, characterized in that: The inner gear directly drives the sun gear of the reduction unit, and the outer gear drives the planet carrier of the reduction unit through the second shifting mechanism. The second shifting mechanism fixes the gear ring of the reduction unit, or fixes the gear ring to the planet carrier.

8. The two-speed dual-motor electric drive transmission device with no power interruption according to claim 6, characterized in that: The inner gear directly drives the planetary carrier of the reduction unit, and the outer gear drives the sun gear of the reduction unit through the second shifting mechanism. The second shifting mechanism connects the sun gear of the reduction unit with the outer gear, or connects the sun gear of the reduction unit with the inner gear.

9. The uninterrupted two-speed dual-motor electric drive transmission device according to any one of claims 6 to 8, characterized in that: The output unit includes a differential.

10. A shifting method for a two-speed dual-motor electric drive transmission device with no power interruption as described in claim 1, characterized in that; In the initial state, the first power unit is connected to the normal passage route and the deceleration route in sequence, and the second power unit is also connected to the deceleration route. After the power of the two is coupled, the deceleration unit is driven in first gear or second gear through the second shifting mechanism, and finally output from the output unit to the wheels on both sides. In this state, the shifting method includes the following steps: Step 1: The first power unit stops, and the first gear shifting mechanism switches; Step 2: The first power unit starts and maintains power output; Step 3: The second power unit stops, and the second gear shifting mechanism switches; Step 4: The second power unit starts to maintain power output; Step 5: Simultaneously, the first power unit stops, and the first gear shifting mechanism switches; Step 6: The first power unit starts and returns to its initial state.

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