Electric drive axle transmission structure with three forward gears

Abstract

Provided is an electric drive axle transmission structure with three forward gears, comprising: a primary reduction driving gear for receiving power from a motor; a first shift unit; an intermediate shaft, fixedly connected with an A gear driven gear, a B gear driven gear and a planetary gear, the A gear driven gear for receiving power from the A gear driving gear; a first short shaft, relatively rotatably sleeved outside the first power output axle, and fixedly connected with a second transfer gear, the second transfer gear meshing with the first transfer gear; a second shift unit; a C gear driven gear, fixedly connected to a planetary carrier of the planetary gear and for receiving power from the C gear driving gear; and a differential, connected to a planetary carrier of the planetary gear through a differential housing, and outputting power to the first power output axle and the second power output axle. It can meet the high efficiency requirements of low gear high torque, high gear high speed and common working conditions.

Description

Technical Field

[0001] The present invention relates to the field of new energy automobile parts, and in particular to an electric drive axle transmission structure with three forward gears. Background Art

[0002] New energy vehicles are receiving more and more attention from the country. At present, most electric drive axles are single-gear or two-gear structures. In order to meet the requirements of power and vehicle speed, the single-gear structure has relatively large requirements for the motor. It must meet the requirements of high torque climbing and high speed. The motor needs to be relatively large and the cost is relatively high. Although the two-gear structure can take into account the requirements of high torque and high speed, and can also reduce the demand for high-performance motors, it is not friendly enough for common working conditions. Although the torque is sufficient in the first gear, it can only be driven at a lower speed. Although the second gear has a high speed, the torque is small. There is an urgent need for a gear that can meet the requirements of high torque at low speed, low torque at high speed, and high torque at common speed.

[0003] Therefore, it is necessary to study an electric drive axle transmission structure with three forward gears to solve one or more of the above-mentioned technical problems. Summary of the invention

[0004] In order to solve at least one of the above technical problems, according to one aspect of the present invention, an electric drive axle transmission structure with three forward gears is provided, which is characterized by comprising:

[0005] The first-stage reduction driving gear is used to receive the power of the motor;

[0006] The first shift unit comprises: a first parallel shaft, fixedly connected with a primary passive gear, the primary passive gear is used to receive power from the primary reduction driving gear; an A gear driving gear and a first transfer gear are relatively rotatably sleeved on the first parallel shaft; a first shifter is arranged on the first parallel shaft and is used to selectively transmit the power of the first parallel shaft to the A gear driving gear or the first transfer gear;

[0007] The intermediate shaft is fixedly connected with the A gear driven gear, the B gear driven gear and the planetary gear, and the A gear driven gear is used to receive the power of the A gear driving gear;

[0008] The first short shaft is relatively rotatably sleeved outside the first power output half shaft and is fixedly connected with a second transfer gear, and the second transfer gear is meshed with the first transfer gear;

[0009] The second shift unit comprises: a third transfer gear meshing with the second transfer gear; a second shifter arranged on the third transfer gear; a second parallel shaft provided with a B gear driving gear and a C gear driving gear, the second shifter is used to selectively transmit the power of the third transfer gear to the B gear driving gear or the C gear driving gear, and the B gear driven gear is used to receive the power of the B gear driving gear;

[0010] A C-gear driven gear fixedly connected to the planet carrier of the planetary gear and used to receive power from the C-gear driving gear; and

[0011] The differential is connected to the planet carrier of the planetary gear set through a differential housing, and outputs power to the first power output half shaft and the second power output half shaft.

[0012] According to another aspect of the present invention, the intermediate shaft and the first short shaft are hollow shafts, and the first power output half shaft passes through the intermediate shaft and the first short shaft in sequence and extends to the wheel edge.

[0013] According to yet another aspect of the present invention, the first shifter is disposed between the A-gear driving gear and the first transfer gear.

[0014] According to yet another aspect of the present invention, the second shifter is disposed on one side of a combination of the B-range driving gear and the C-range driving gear.

[0015] According to yet another aspect of the present invention, the second shift unit further comprises:

[0016] A second short shaft is relatively rotatably sleeved outside the second parallel shaft, the B gear driving gear is fixedly connected to the second short shaft, and the C gear driving gear is fixedly connected to the second parallel shaft; and

[0017] The second parallel shaft engaging tooth is fixedly connected to one end of the second parallel shaft.

[0018] According to yet another aspect of the present invention, a power take-off is also connected to the second parallel shaft.

[0019] According to still another aspect of the present invention, the second shifter may be engaged with the second parallel shaft engaging teeth to transmit the power of the third transfer gear to the second parallel shaft and the C range driving gear.

[0020] According to another aspect of the present invention, the planetary gear set includes a sun gear, planetary gears, a planet carrier and a ring gear, and the ring gear is connected to the housing.

[0021] According to another aspect of the present invention, the second parallel shaft is a hollow shaft and a transmission shaft is passed through the interior thereof, and the third transfer gear is fixed to the transmission shaft.

[0022] According to another aspect of the present invention, the electric drive axle transmission structure with three forward gears further includes a power take-off, which is directly connected to the transmission shaft or receives power via a third transfer gear, a transmission gear and another transmission shaft.

[0023] The present invention can achieve one or more of the following technical effects:

[0024] 1. The dual shifter structure can meet the extreme working conditions of low gear high torque and high gear high speed, while also taking into account the high efficiency requirements of common working conditions.

[0025] 2. The double parallel shaft arrangement is adopted to shorten the axial space and make the structural arrangement convenient and compact.

[0026] 3. Planetary gearbox is used as the final torque output structure, which has large load capacity and small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 1 It is a schematic diagram of an electric drive axle transmission structure with three forward gears according to a preferred embodiment of the present invention.

[0029] Figure 2-4 It is a schematic diagram of the power transmission route of three forward gears ABC of an electric drive axle transmission structure with three forward gears according to another preferred embodiment of the present invention.

[0030] Figure 5-6 Schematic diagram of an electric drive axle transmission structure with three forward gears according to the second and third preferred embodiments of the present invention. DETAILED DESCRIPTION

[0031] The best implementation mode of the present invention is described below through preferred embodiments in conjunction with the accompanying drawings. The specific implementation mode here is to illustrate the present invention in detail and should not be understood as limiting the present invention. Various deformations and modifications can be made without departing from the spirit and essential scope of the present invention, which should be included in the protection scope of the present invention.

[0032] Example 1

[0033] According to a preferred embodiment of the present invention, see Figure 1-6 , provides an electric drive axle transmission structure with three forward gears, characterized by comprising:

[0034] The primary reduction driving gear 03 is used to receive the power of the motor 01;

[0035] The first shift unit comprises: a first parallel shaft 10, fixedly connected with a first-stage passive gear 04, the first-stage passive gear is used to receive power from the first-stage reduction driving gear; an A-gear driving gear 05 and a first transfer gear 07, which are relatively rotatably sleeved on the first parallel shaft; a first shifter 09, which is arranged on the first parallel shaft and is used to selectively transmit the power of the first parallel shaft to the A-gear driving gear 05 or the first transfer gear 07;

[0036] The intermediate shaft 18 is fixedly connected with the A-gear driven gear 06, the B-gear driven gear 14 and the planetary gear. The A-gear driven gear 06 is used to receive the power of the A-gear driving gear 05;

[0037] The first short shaft is relatively rotatably sleeved on the first power output half shaft 26 and is fixedly connected with the second transfer gear 08, and the second transfer gear 08 is meshed with the first transfer gear 07;

[0038] The second shift unit includes: a third transfer gear 11 meshing with the second transfer gear 08; a second shifter 17 disposed on the third transfer gear 11; a second parallel shaft 19 provided with a B-gear driving gear 13 and a C-gear driving gear 15, the second shifter 17 is used to selectively transmit the power of the third transfer gear 11 to the B-gear driving gear 13 or the C-gear driving gear 15, and the B-gear driven gear 14 is used to receive the power of the B-gear driving gear 13;

[0039] The C-gear driven gear 16 is fixedly connected to the planet carrier of the planetary gear and is used to receive the power of the C-gear driving gear 15; and

[0040] The differential is connected to the planet carrier of the planetary gear set through the differential case 24 , and outputs power to the first power output half shaft 26 and the second power output half shaft 27 .

[0041] According to another preferred embodiment of the present invention, the intermediate shaft 18 and the first short shaft are hollow shafts, and the first power output half shaft 26 passes through the intermediate shaft 18 and the first short shaft in sequence and extends to the wheel edge.

[0042] According to another preferred embodiment of the present invention, the first shifter 09 is disposed between the A-gear driving gear 05 and the first transfer gear 07 .

[0043] According to another preferred embodiment of the present invention, the second shifter 17 is disposed on one side of the combination of the B-range driving gear 13 and the C-range driving gear 15 .

[0044] According to another preferred embodiment of the present invention, the second shift unit further includes:

[0045] A second short shaft is relatively rotatably sleeved outside the second parallel shaft 19, the B gear driving gear 13 is fixedly connected to the second short shaft, and the C gear driving gear 15 is fixedly connected to the second parallel shaft; and

[0046] The second parallel shaft engaging tooth is fixedly connected to one end of the second parallel shaft ( Figure 1 left end shown in FIG.

[0047] According to another preferred embodiment of the present invention, a power take-off 20 is further connected to the second parallel shaft.

[0048] According to yet another preferred embodiment of the present invention, the second shifter 17 may be engaged with the second parallel shaft engaging teeth to transmit the power of the third transfer gear 11 to the second parallel shaft 19 and the C-range driving gear 15 .

[0049] According to another preferred embodiment of the present invention, the planetary gear set includes a sun gear 21, planetary gears 22, a planet carrier and a ring gear 23, and the ring gear 23 is connected to the housing.

[0050] According to another preferred embodiment of the present invention, see Figure 5-6 The second parallel shaft is a hollow shaft and a transmission shaft is passed through the interior, and the third transfer gear is fixed to the transmission shaft.

[0051] According to another preferred embodiment of the present invention, the electric drive axle transmission structure with three forward gears also includes a power take-off, which is directly connected to the transmission shaft (such as Figure 5 ), or receives power via a third transfer gear, a transmission gear and another transmission shaft (as shown in Figure 6 shown).

[0052] According to another preferred embodiment of the present invention, a three-speed electric drive axle transmission structure with convenient layout, safety and reliability is provided for new energy commercial vehicles, which is characterized by:

[0053] The motor 01 is connected to the first-stage reduction driving gear 03 through the motor shaft 02, and the first-stage driving gear 03 is meshed with the first-stage passive gear 04. The first-stage passive gear 04 is installed on the first parallel shaft 10. The first shifter 09, the A-gear driving gear 05 and the transfer gear A07 are also installed on the first parallel shaft 10. The first shifter can slide left and right on the first parallel shaft. When sliding to the left, the first shifter 09 is engaged with the transfer gear A07. When sliding to the right, the first shifter 09 is engaged with the A-gear driving gear 05. The above-mentioned transfer gear A07 is meshed with the transfer gear B08, and the transfer gear B08 is meshed with the transfer gear C11. The three gears of the transfer gears A / B / C (the first transfer gear A, the second transfer gear B, and the third transfer gear C) form a triple gear. The A gear driving gear 05 is meshed with the A gear driven gear 06, which is mounted on the intermediate shaft 18, and the B gear driven gear 14 and the sun gear 21 are also mounted on the intermediate shaft 18. The B gear driven gear 14 is meshed with the B gear driving gear 13, which is mounted on the second parallel shaft 19, and the C gear driving gear 15 and the power take-off 20 are also mounted on the second parallel shaft 19. The power take-off can be arranged according to the specific spatial structure, or it can be arranged without the power take-off 20 structure. The C gear driving gear 15 is meshed with the C gear driven gear 16, and the C gear driven gear 16 is fixed together with the planet carrier. The second shifter 17 is also mounted on the transfer gear C11, and the second shifter 17 can slide along the axial direction of the transfer gear C11. When the second shifter 17 slides to the right, the second shifter 17 engages with the B gear driving gear 13, and when the second shifter 17 slides to the left, the second shifter 17 engages with the C gear driving gear 15. The sun gear 21 meshes with the planetary gear 22, and the planetary gear 22 meshes with the ring gear 23, which is mounted on the housing. The planetary frame is fixed with the differential 24, which is connected to the left half shaft 26 and the right half shaft 27 through the left and right sun gears, respectively. The fixed teeth of the differential lock 25 are also installed at one end of the differential, and the sliding teeth of the differential lock 25 are installed on the right half shaft. The left and right half shafts 26 / 27 are connected to the left and right wheel edges respectively.

[0054] The working principle of the present invention is as follows.

[0055] A gear:

[0056] Combined with Figure 2The power on the motor 01 is transmitted to the primary reduction driving gear 03 through the motor shaft 02. The primary reduction driving gear 03 is meshed with the primary reduction passive gear 04. The primary reduction passive gear 04 is mounted on the first parallel shaft 10. The first parallel shaft 10 is also mounted with the first shifter 09, the A gear driving gear 05 and the transfer gear A07. When the first shifter 09 slides to the right, the power on the primary reduction driving gear 03 is transmitted to the first parallel shaft 10 through the primary reduction passive gear 04 meshed therewith. Since the first shifter 09 slides to the right and engages with the A gear driving gear 05, the power is transmitted to the A gear passive gear 06 meshed with the A gear driving gear 05. The A gear passive gear 06 is mounted on the intermediate shaft 18. The B gear passive gear 14 and the sun gear 21 are also mounted on the intermediate shaft 18. The power of the A gear passive gear 06 is transmitted to the sun gear 21 through the intermediate shaft 18. The sun gear 21 meshes with the planetary gear 22, which meshes with the ring gear 23, which is fixed to the housing. The planetary gear 22 is connected to the planetary carrier via a pin, and the planetary carrier is integrated with the housing of the differential 24. Therefore, the power on the sun gear is transmitted to the differential housing on the planetary carrier via the planetary gear 22, and the differential 24 transmits the power to the left and right half shafts via internal gears until it is transmitted to the left and right wheel sides, completing the power transmission of gear A.

[0057] B gear:

[0058] Combined with Figure 3The power on the motor 01 is transmitted to the primary reduction driving gear 03 through the motor shaft 02. The primary reduction driving gear 03 is meshed with the primary reduction driven gear 04. The primary reduction driven gear 04 is mounted on the first parallel shaft 10. The first parallel shaft 10 is also equipped with a first shifter 09, an A gear driving gear 05 and a transfer gear A07. When the first shifter 09 slides to the left, the power on the primary reduction driving gear 03 is transmitted to the first parallel shaft 10 through the primary reduction driven gear 04 meshed therewith. Since the first shifter 09 slides to the left and the transfer gear A07 is engaged with the transfer gear A07, the power on the primary reduction driving gear 03 is transmitted to the first parallel shaft 10 through the primary reduction driven gear 04 meshed therewith. The transfer gear A07 is engaged, and the power is transmitted to the transfer gear B08 meshing with the transfer gear A07. The transfer gear B08 is also meshing with the transfer gear C11. The transfer gear C11 is mounted with the second shifter 17. When the second shifter 17 slides to the right, the second shifter 17 is engaged with the B gear driving gear 13 mounted on the second parallel shaft 19. The power on the transfer gear B08 is transmitted to the second shifter 17 through the triple gears. Because the second shifter 17 is engaged with the B gear driving gear 13 at this time, the power is transmitted to the B gear driving gear 13. The B gear driving gear 13 is meshed with the B gear driven gear 14 mounted on the intermediate shaft 18. The end of the intermediate shaft is connected to the sun gear 21. The power on the B gear driving gear 13 is transmitted to the sun gear 21 through the B gear driven gear 14 meshing therewith and the intermediate shaft 18. The sun gear 21 meshes with the planetary gear 22, the planetary gear 22 meshes with the ring gear 23, the ring gear 23 is fixed to the housing, the planetary gear 22 is connected to the planetary carrier through a pin, the planetary carrier and the housing of the differential 24 are integrated, so the power on the sun gear is transmitted to the differential housing on the planetary carrier through the planetary gear 22, and the differential 24 transmits the power to the left and right half shafts through the internal gears until it is transmitted to the left and right wheel sides.

[0059] C gear:

[0060] Combined with Figure 4The power on the motor 01 is transmitted to the primary reduction driving gear 03 through the motor shaft 02. The primary reduction driving gear 03 is meshed with the primary reduction driven gear 04. The primary reduction driven gear 04 is mounted on the first parallel shaft 10. The first parallel shaft 10 is also equipped with a first shifter 09, an A gear driving gear 05 and a transfer gear A07. When the first shifter 09 slides to the left, the power on the primary reduction driving gear 03 is transmitted to the first parallel shaft 10 through the primary reduction driven gear 04 meshed therewith. Since the first shifter 09 slides to the left and the transfer gear A07 is engaged with the transfer gear A07, the power on the primary reduction driving gear 03 is transmitted to the first parallel shaft 10 through the primary reduction driven gear 04 meshed therewith. The connecting gear A07 is engaged, and the power is transmitted to the transfer gear B08 meshing with the transfer gear A07. The transfer gear B08 is also meshing with the transfer gear C11. The second shifter 17 is installed on the transfer gear C11. When the second shifter 17 slides to the left, the second shifter 17 engages with the C gear driving gear 15 installed on the second parallel shaft 19. The power on the above-mentioned transfer gear B08 is transmitted to the second shifter 17 through the triple teeth. Because the second shifter 17 is engaged with the C gear driving gear 15 at this time, the power is transmitted to the C gear driving gear 15. The above-mentioned C-gear driving gear 15 is meshed with the C-gear driven gear 16 installed on the planetary frame. The C-gear driven gear 16 is installed on the planetary frame. The planetary frame and the housing of the differential 24 are integrated. Therefore, the power on the C-gear driving gear 15 is transmitted to the differential 24 through the C-gear driven gear 16 and the planetary frame meshed therewith. The differential 24 transmits the power to the left and right half shafts through the internal gears until it is transmitted to the left and right wheel sides.

[0061] The above transmission is a preferred example. The transmission structure of this patent is not limited to the above examples. Any other variations that can realize the structural connection relationship and connection principle described in this patent are deemed to be equivalent to this patent, such as Figure 5-6 The changes shown in the above table are as follows. Figure 5 The main change of the example is that the power take-off 20 is installed on the transfer gear C11 through the B gear driving gear 13 and the C gear driving gear 15, and the rest of the structure is the same. Figure 1 Example. Figure 6 The main change of the example is that the power take-off 20 is meshed with the transfer gear C11 through an additional gear, and the rest of the structure is the same. Figure 5 Example.

[0062] The present invention can achieve one or more of the following technical effects:

[0063] 1. The dual shifter structure can meet the extreme working conditions of low gear high torque and high gear high speed, while also taking into account the high efficiency requirements of common working conditions.

[0064] 2. The double parallel shaft arrangement is adopted to shorten the axial space and make the structural arrangement convenient and compact.

[0065] 3. Planetary gearbox is used as the final torque output structure, which has large load capacity and small space.

[0066] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An electric drive axle transmission structure with three forward gears, characterized in that include: The first-stage reduction driving gear is used to receive the power of the motor; The first shift unit comprises: a first parallel shaft, fixedly connected with a primary passive gear, the primary passive gear is used to receive power from the primary reduction driving gear; an A gear driving gear and a first transfer gear are relatively rotatably sleeved on the first parallel shaft; a first shifter is arranged on the first parallel shaft and is used to selectively transmit the power of the first parallel shaft to the A gear driving gear or the first transfer gear; The intermediate shaft is fixedly connected with the A gear driven gear, the B gear driven gear and the sun gear of the planetary gear, wherein the planetary gear includes a sun gear, planetary gears, a planet carrier and a ring gear, the ring gear is connected to the housing, and the A gear driven gear is used to receive the power of the A gear driving gear; The first short shaft is relatively rotatably sleeved outside the first power output half shaft and is fixedly connected with a second transfer gear, and the second transfer gear is meshed with the first transfer gear; The second shift unit comprises: a third transfer gear meshing with the second transfer gear; a second shifter arranged on the third transfer gear; a second parallel shaft provided with a B gear driving gear and a C gear driving gear, the second shifter is used to selectively transmit the power of the third transfer gear to the B gear driving gear or the C gear driving gear, and the B gear driven gear is used to receive the power of the B gear driving gear; A C-gear driven gear fixedly connected to the planet carrier of the planetary gear and used to receive power from the C-gear driving gear; and A differential, connected to the planet carrier of the planetary gear set through a differential housing, and outputting power to the first power output half shaft and the second power output half shaft; Wherein, the intermediate shaft and the first short shaft are hollow shafts, and the first power output half shaft sequentially passes through the intermediate shaft and the first short shaft and extends to the wheel edge; The second shift unit also includes: A second short shaft is relatively rotatably sleeved outside the second parallel shaft, the B gear driving gear is fixedly connected to the second short shaft, and the C gear driving gear is fixedly connected to the second parallel shaft; and The second parallel shaft engaging tooth is fixedly connected to one end of the second parallel shaft.

2. The electric drive axle transmission structure with three forward gears according to claim 1, characterized in that The first shifter is arranged between the A-gear driving gear and the first transfer gear.

3. The electric drive axle transmission structure with three forward gears according to claim 1 or 2, characterized in that The second shifter is arranged on one side of the combination of the B-range driving gear and the C-range driving gear.

4. The electric drive axle transmission structure with three forward gears according to claim 1, characterized in that The second parallel shaft is also connected with a power take-off.

5. The electric drive axle transmission structure with three forward gears according to claim 1, characterized in that The second shifter may be engaged with the second parallel shaft engaging teeth to transmit the power of the third transfer gear to the second parallel shaft and the C-range driving gear.

6. The electric drive axle transmission structure with three forward gears according to claim 1, characterized in that The second parallel shaft is a hollow shaft with a transmission shaft passing through the interior, and the third transfer gear is fixed to the transmission shaft.

7. The electric drive axle transmission structure with three forward gears according to claim 6, characterized in that Also included is a power take-off, which is directly connected to the transmission shaft or receives power via a third transfer gear, a transmission gear and another transmission shaft.

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