Two-motor drive structure with single-side motor shifting

Abstract

A two-motor drive structure with single-side motor shifting is provided, comprising: a central shaft, fixedly connected with a driving engagement tooth; a spline sleeve, relatively rotatably sleeved outside the central shaft, and provided with a double-star planetary gear and an engagement tooth sleeve, the gear ring of the double-star planetary gear is connected to the central shaft; a short shaft, relatively rotatably sleeved outside the spline sleeve, and connected to the planet carrier of the double-star planetary gear; a first power input gear, fixedly connected to the short shaft; a brake engagement tooth, connected to the housing; a second power input gear, fixedly installed on the outer periphery of the double-star planetary gear; and a differential, connected to the central shaft and driven by the central shaft, and used to transmit power to the first output half shaft and the second output half shaft; wherein the engagement tooth sleeve can selectively engage with the brake engagement tooth or the driving engagement tooth. The use of a double-star planetary gear structure can effectively improve the load-bearing capacity.

Description

Technical Field

[0001] The present invention relates to the field of new energy automobile parts, and in particular to a dual-motor drive structure with single-side motor shifting. Background Art

[0002] New energy vehicles are receiving more and more attention from the country and the automotive industry. With the iterative development of electric drive technology for medium and heavy commercial vehicles, the integrated electric drive axle system has gradually become the mainstream drive form for the new generation of medium and heavy commercial vehicles. However, the current electric drive axle has a complex transmission structure, low transmission efficiency, heavy weight, and high cost, which makes it difficult to meet the requirements of power, vehicle speed, and economy under different road conditions.

[0003] Therefore, it is necessary to study a two-motor drive structure with single-side motor shifting 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, a two-motor drive structure with single-side motor shifting is provided, which is characterized by comprising:

[0005] A central shaft fixedly connected with driving engaging teeth;

[0006] A spline sleeve is relatively rotatably sleeved outside the central shaft and is provided with a double-star planetary gear and a coupling gear sleeve, wherein the gear ring of the double-star planetary gear is connected to the central shaft;

[0007] The short shaft is sleeved on the outside of the spline sleeve so as to be relatively rotatable and connected to the planet carrier of the double planetary gear train;

[0008] A first power input gear, fixedly connected to the short shaft;

[0009] A brake engaging tooth connected to the housing;

[0010] A second power input gear is fixedly mounted on the outer periphery of the double planetary gear; and

[0011] a differential connected to and driven by the central shaft and used to transmit power to the first output half shaft and the second output half shaft;

[0012] Wherein, the engaging tooth sleeve can be selectively engaged with the braking engaging teeth or the driving engaging teeth.

[0013] According to another aspect of the present invention, the dual-motor drive structure with single-side motor shifting further includes a first transmission unit, which is used to transmit the power of the first motor to the first power input gear.

[0014] According to another aspect of the present invention, the dual-motor drive structure with single-side motor shifting further includes a second transmission unit, which is used to transmit the power of the second motor to the second power input gear.

[0015] According to another aspect of the present invention, the double-star planetary gear train comprises a sun gear, inner planetary gears, outer planetary gears, a planet carrier and a ring gear, and the sun gear is fixedly connected to a spline sleeve.

[0016] According to another aspect of the present invention, the first transmission unit includes: a first transmission gear, a second transmission gear, a first transmission shaft and a third transmission gear, the first transmission gear is driven by the first motor, the second transmission gear is meshed with the first transmission gear, the second transmission gear and the third transmission gear are fixedly connected to the first transmission shaft, and the third transmission gear is meshed with the first power input gear.

[0017] According to another aspect of the present invention, the second transmission unit includes: a fourth transmission gear, a fifth transmission gear, a second transmission shaft and a sixth transmission gear, the fourth transmission gear is driven by the second motor, the fifth transmission gear is meshed with the fourth transmission gear, the fifth transmission gear and the sixth transmission gear are fixedly connected to the second transmission shaft, and the sixth transmission gear is meshed with the second power input gear.

[0018] According to yet another aspect of the present invention, the ring gear of the double-star planetary gear set is connected to the central shaft via a connecting member.

[0019] According to yet another aspect of the present invention, the clutch sleeve is driven by a single-sided motor to achieve gear shifting.

[0020] According to yet another aspect of the present invention, when the engaging gear sleeve is engaged with the brake engaging gear, it is the first forward gear.

[0021] According to yet another aspect of the present invention, when the engaging gear sleeve is engaged with the driving engaging gear, it is the second forward gear.

[0022] The present invention can achieve one or more of the following technical effects:

[0023] 1. Two motors cooperate with double planetary gears to realize two-speed transmission, which can meet the requirements of power, speed and economy under different road conditions, and improve the carrying capacity and reliability;

[0024] 2. The use of double-star planetary gearbox can reduce the speed ratio between the first and second gears, reduce the gear shifting shock, make the gear shifting smoother, and improve the driving comfort;

[0025] 3. The use of double-star planetary gear structure can effectively improve the carrying capacity and enhance the compactness of the entire product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Figure 1 Schematic diagram of a two-motor drive structure with single-side motor shifting according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0028] 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.

[0029] Example 1

[0030] According to a preferred embodiment of the present invention, see Figure 1 , provides a two-motor drive structure with single-side motor shifting, which is characterized by comprising:

[0031] The central shaft 23 is fixedly connected with the driving engaging teeth 17;

[0032] The spline sleeve 15 is relatively rotatably sleeved outside the central shaft 23 and is provided with a double planetary gear and a coupling gear sleeve 18. The gear ring 13 of the double planetary gear is connected to the central shaft 23;

[0033] The short shaft 2 is relatively rotatably sleeved on the outside of the spline sleeve 15 and connected to the planet carrier 9 of the double planetary gear train;

[0034] A first power input gear 8, fixedly connected to the short shaft 2;

[0035] The brake engaging teeth 16 are connected to the housing 22;

[0036] The second power input gear 14 is fixedly mounted on the outer periphery of the double planetary gear; and

[0037] a differential 29 connected to the central shaft 23 and driven by the central shaft 23 and used to transmit power to the first output half shaft 31 and the second output half shaft 30;

[0038] The engaging tooth sleeve 18 can be selectively engaged with the braking engaging teeth 16 or the driving engaging teeth 17 .

[0039] Preferably, the differential 29 can be directly or indirectly connected to the central shaft 23. For example, the differential 29 can also be connected to the central shaft 23 through a planetary gear.

[0040] According to another preferred embodiment of the present invention, the dual-motor drive structure with single-side motor shifting further includes a first transmission unit, which is used to transmit the power of the first motor M1 to the first power input gear 8.

[0041] According to another preferred embodiment of the present invention, the dual-motor drive structure with single-side motor shifting further includes a second transmission unit, which is used to transmit the power of the second motor M2 to the second power input gear 14 .

[0042] According to another preferred embodiment of the present invention, the double planetary gear train comprises a sun gear 10 , inner planetary gears 11 , outer planetary gears 12 , a planet carrier 9 and a ring gear 13 , and the sun gear is fixedly connected to a spline sleeve 15 .

[0043] According to another preferred embodiment of the present invention, the first transmission unit includes: a first transmission gear 4, a second transmission gear 5, a first transmission shaft 6 and a third transmission gear 7, the first transmission gear 4 is driven by the first motor, the second transmission gear 5 is meshed with the first transmission gear 4, the second transmission gear 5 and the third transmission gear 7 are fixedly connected to the first transmission shaft 6, and the third transmission gear 7 is meshed with the first power input gear 8. It can be understood that the structure of the first transmission unit is not limited to this, for example, it can also be composed of a pair of gear pairs, etc.

[0044] According to another preferred embodiment of the present invention, the second transmission unit includes: a fourth transmission gear 33, a fifth transmission gear 34, a second transmission shaft 35 and a sixth transmission gear 36, the fourth transmission gear 33 is driven by the second motor, the fifth transmission gear 34 is meshed with the fourth transmission gear 33, the fifth transmission gear 34 and the sixth transmission gear 36 are fixedly connected to the second transmission shaft 35, and the sixth transmission gear 36 is meshed with the second power input gear 14. It can be understood that the structure of the second transmission unit is not limited to this, for example, it can also be composed of a pair of gear pairs, etc.

[0045] According to another preferred embodiment of the present invention, the ring gear 13 of the double planetary gear set is connected to the central shaft 23 via a connecting piece.

[0046] According to another preferred embodiment of the present invention, the clutch sleeve 18 is driven by a single-sided motor 21 to achieve gear shifting.

[0047] According to another preferred embodiment of the present invention, when the engaging tooth sleeve 18 is engaged with the brake engaging tooth 16 , it is the first forward gear.

[0048] According to another preferred embodiment of the present invention, when the engaging tooth sleeve 18 is engaged with the driving engaging tooth 17 , it is the second forward gear.

[0049] According to another preferred embodiment of the present invention, a two-motor drive structure with single-side motor shifting is also provided, characterized in that: the motor M1 is connected to the gear 4 through the motor shaft 3, the gear 4 is meshed with the gear 5, the gear 5 is rigidly connected to the shaft 6 and the gear 7, the gear 7 is meshed with the gear 8, the gear 8 is rigidly connected to the planetary carrier 9, the inner planetary gear 11 and the outer planetary gear 12 have both revolution around the central axis of the planetary carrier 9 and rotation around the axis of their own planetary gear shafts under the constraint of the planetary carrier 9, the sun gear 10 is meshed with the inner planetary gear 11, the inner planetary gear 11 is meshed with the outer planetary gear 12, the outer planetary gear 12 is meshed with the inner gear ring 13, the sun gear 10 is rigidly connected to the spline sleeve 15, the spline sleeve 15 and the engaging tooth sleeve 18 are radially fixed and axially slide relative to each other, the engaging tooth sleeve 18 is connected to the shift fork 19, the shift fork 19 is fixed on the shift transmission rod 20, and the shift motor 21 drives the shift transmission rod 20 to perform Slide left and right to shift gears; the brake engaging teeth 16 and the housing 22 are rigidly connected, the brake engaging teeth 16 and the output engaging teeth 17 are distributed on both sides of the engaging tooth sleeve 18, respectively serving as the first position and the second position of the shift gear, the output engaging teeth 17 are rigidly connected coaxially with the shaft 23, the inner ring 13, the gear 14, and the differential case 28, the differential case 28 drives the differential 29, and the differential 29 transmits power to the first half shaft 30, the second half shaft 31 and then to the wheel side; the motor M2 is connected to the gear 33 through the motor shaft 32, the gear 33 is meshed with the gear 34, the gear 34 is rigidly connected to the intermediate shaft 35 and the gear 36, the gear 36 is meshed with the gear 8, and its subsequent power transmission is the same as the structural form of the motor M1, the motor M1 and the motor M2 are arranged symmetrically or at a certain angle, and any other parts that can realize the structural connection relationship and connection principle described in this patent are deemed to be the same as this patent.

[0050] The working principle of the present invention is as follows.

[0051] First gear (low speed gear): The output torque of motors M1 and M2 is transmitted to gears 4 and 33 through motor shafts 3 and 32. Gears 4 and 33 are meshed with gears 5 and 34 respectively. Gear 5 is rigidly connected to gear 7, and gear 34 is rigidly connected to gear 36. Gear 7 transmits power to gear 8 through gear meshing connection. Gear 8 is rigidly connected to planet carrier 9, and gear 36 is meshed with gear 14. The shift motor 21 drives the shift drive rod 20, and the shift drive rod 20 drives the shift fork 19 and the engagement gear sleeve 18 to slide axially along the spline sleeve 15. The engagement gear sleeve 18 engages with the brake engagement teeth 16 to reach the first gear position. The sun gear 10 is completely fixed, and the planet carrier 9 drives the inner planetary gear 11 and the outer planetary gear 12 to rotate around the central axis. At this time, the planetary gear structure composed of the inner planetary gear 11, the outer planetary gear 12, and the inner ring gear 13 is in a reduction transmission state. The inner ring gear 13 is rigidly connected to the gear 14, the shaft 23, and the differential case 28, and transmits the power to the first output half shaft 30 and the second output half shaft 31 through the differential 29, and finally outputs it to the wheel side.

[0052] Second gear (high speed gear): The output torque of motors M1 and M2 is transmitted to gears 4 and 33 through motor shafts 3 and 32. Gears 4 and 33 are meshed with gears 5 and 34 respectively. Gear 5 is rigidly connected to gear 7, and gear 34 is rigidly connected to gear 36. Gear 7 transmits power to gear 8 through gear meshing connection. Gear 8 is rigidly connected to planetary carrier 9, and gear 36 is meshed with gear 14. The shift motor 21 drives the shift transmission rod 20, and the shift transmission rod 20 drives the shift fork 19 and the engaging gear sleeve 18 to slide axially along the spline sleeve 15, and the engaging gear sleeve 8 engages with the driving engaging teeth 17 to reach the second gear position. The gear 8 and the planetary carrier 9, the sun gear 10, the inner planetary gear 11, the outer planetary gear 12, and the inner ring gear 13 rotate as a whole. At this time, the planetary row structure composed of the planetary carrier 9, the sun gear 10, the inner planetary gear 11, the outer planetary gear 12 and the inner ring gear 13 is in a direct transmission state with a speed ratio of 1. The planetary carrier 9, the inner ring gear 13, the gear 14, the shaft 23 are rigidly connected to the differential case 28, and the power is transmitted to the first output half shaft 30 and the second output half shaft 31 respectively through the differential 29, and finally output to the wheel side.

[0053] The present invention can achieve one or more of the following technical effects:

[0054] 1. Two motors cooperate with double planetary gears to realize two-speed transmission, which can meet the requirements of power, speed and economy under different road conditions, and improve the carrying capacity and reliability;

[0055] 2. The use of double-star planetary gearbox can reduce the speed ratio between the first and second gears, reduce the gear shifting shock, make the gear shifting smoother, and improve the driving comfort;

[0056] 3. The use of double-star planetary gear structure can effectively improve the carrying capacity and enhance the compactness of the entire product.

[0057] 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. A two-motor drive structure with single-side motor shifting, characterized in that include: A central shaft fixedly connected with driving engaging teeth; A spline sleeve is relatively rotatably sleeved outside the central shaft and is provided with a double-star planetary gear and a coupling gear sleeve, wherein the double-star planetary gear comprises a sun gear, an inner planetary gear, an outer planetary gear, a planet carrier and a ring gear, wherein the sun gear is fixedly connected to the spline sleeve, and the ring gear of the double-star planetary gear is connected to the central shaft; The short shaft is sleeved on the outside of the spline sleeve so as to be relatively rotatable and connected to the planet carrier of the double planetary gear train; A first power input gear, fixedly connected to the short shaft; A brake engaging tooth connected to the housing; The second power input gear is fixedly mounted on the outer periphery of the gear ring of the double planetary gear set; as well as a differential connected to and driven by the central shaft and used to transmit power to the first output half shaft and the second output half shaft; Wherein, the engaging tooth sleeve can be selectively engaged with the braking engaging teeth or the driving engaging teeth.

2. The dual-motor drive structure with single-side motor shifting according to claim 1 is characterized in that It also includes a first transmission unit, which is used to transmit the power of the first motor to the first power input gear.

3. The dual-motor drive structure with single-side motor shifting according to claim 2 is characterized in that It also includes a second transmission unit, which is used to transmit the power of the second motor to the second power input gear.

4. The dual-motor drive structure with single-side motor shifting according to claim 3 is characterized in that The first transmission unit includes: a first transmission gear, a second transmission gear, a first transmission shaft and a third transmission gear. The first transmission gear is driven by the first motor. The second transmission gear is meshed with the first transmission gear. The second transmission gear and the third transmission gear are fixedly connected to the first transmission shaft. The third transmission gear is meshed with the first power input gear.

5. The dual-motor drive structure with single-side motor shifting according to claim 4 is characterized in that The second transmission unit includes: a fourth transmission gear, a fifth transmission gear, a second transmission shaft and a sixth transmission gear. The fourth transmission gear is driven by the second motor. The fifth transmission gear is meshed with the fourth transmission gear. The fifth transmission gear and the sixth transmission gear are fixedly connected to the second transmission shaft. The sixth transmission gear is meshed with the second power input gear.

6. The dual-motor drive structure with single-side motor shifting according to claim 5, characterized in that The ring gear of the double planetary gear set is connected to the central shaft through a connecting piece.

7. The dual-motor drive structure with single-side motor shifting according to claim 6, characterized in that The clutch sleeve is driven by a single-sided motor to achieve gear shifting.

8. The dual-motor drive structure with single-side motor shifting according to claim 1, characterized in that When the engaging gear sleeve is engaged with the brake engaging gear, it is the first forward gear.

9. The dual-motor drive structure with single-side motor shifting according to claim 4, characterized in that When the engaging gear sleeve is engaged with the driving engaging gear, it is the second forward gear.

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