Reduction gearbox for vehicle

Abstract

The invention provides a reduction gearbox for a vehicle, which comprises a reduction planetary gear train and an input shaft, the reduction planetary gear train and the input shaft are sequentially arranged in a reduction gearbox body along the transverse direction, the reduction planetary gear train is connected with the power input end of the reduction gearbox, the input shaft is connected to the reduction planetary gear train, and the input shaft and the reduction planetary gear train are coaxial. The utilization rate and the torque density of the gears are effectively improved, the enveloping size of the reduction gearbox body is reduced, the occupied space of the reduction gearbox body on a vehicle is reduced, and meanwhile cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle reduction gearboxes, and in particular to reduction gearboxes for new energy vehicles. Background Art

[0002] The reduction gearbox of new energy vehicles usually has only one fixed transmission ratio and an integrated open differential. Currently, more and more vehicle models, such as off-road vehicles and pickup trucks, need to output large torque under certain circumstances, which requires the vehicle's reduction gearbox to adapt to a wider torque range. For example, some situations require a higher speed ratio and a loaded differential lock to achieve the function of getting out of trouble; on the other hand, under normal circumstances, small torque and small speed ratio are required to balance energy consumption. In order to meet these requirements, some new energy vehicles have begun to use reduction gearboxes with two gears. This design can provide greater torque at low speeds to cope with off-road, climbing and other scenarios. At the same time, it can reduce energy consumption and improve economy by switching to a small speed ratio gear when driving at high speed.

[0003] In the prior art, the Chinese invention patent with application number "201911403413.3" and name "vehicle reduction box" specifically discloses "including an input shaft, an intermediate shaft, an output shaft, a primary reduction gear set, a secondary reduction gear set, a tertiary reduction gear set, a synchronizer, a main reduction mechanism and a differential, wherein the primary reduction gear set is arranged on the input shaft and the output shaft to achieve primary reduction, the secondary reduction gear set is arranged on the intermediate shaft and the output shaft to achieve secondary reduction, the tertiary reduction gear set is arranged on the intermediate shaft and the output shaft to achieve tertiary reduction, the primary reduction gear set drives the secondary reduction gear set to rotate, the synchronizer is slidably arranged on the output shaft, The output shaft drives the differential to operate through the main reduction mechanism and is selectively connected to the secondary reduction gear set or the tertiary reduction gear set. The reduction box can achieve four-stage reduction in the first gear, which improves the speed ratio. Although this technical solution can provide a large torque in the first gear to adapt to vehicle starting or ramp starting, and provide a higher speed ratio in the second gear to increase the vehicle speed, when the reduction box is in the first gear, four pairs of gears are required to participate in the meshing to achieve the four-stage reduction, which makes the reduction box body envelope larger and the space utilization rate of the vehicle low; when the reduction box is in the second gear, only two pairs of gears are involved in the meshing to achieve the secondary reduction, and the remaining two pairs of gears are in an idling state, resulting in a low gear utilization rate, which in turn leads to a high product cost. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a reduction gearbox for a vehicle to reduce the envelope size of the reduction gearbox, improve the utilization rate and torque density of the gears, and reduce the cost.

[0005] The present invention proposes a reduction gearbox for a vehicle, comprising a reduction planetary gear train and an input shaft, wherein the reduction planetary gear train and the input shaft are sequentially arranged in a reduction gearbox body along the transverse direction, the reduction planetary gear train is connected to a power input end of the reduction gearbox, the input shaft is connected to the reduction planetary gear train, and the input shaft is coaxial with the reduction planetary gear train to reduce the envelope size of the reduction gearbox body.

[0006] Preferably, the reduction gear box also includes an intermediate shaft, a differential lock, a shifting mechanism, a first reduction gear set and a second reduction gear set, the intermediate shaft is arranged parallel to the input shaft; the first reduction gear set is arranged on the input shaft and the intermediate shaft to form a second stage reduction; the second reduction gear set is arranged on the input shaft and the intermediate shaft, and the shifting mechanism selectively connects one of the first reduction gear set and the second reduction gear set; the intermediate shaft drives the main reduction mechanism to operate to form a third stage reduction, and the main reduction mechanism drives the differential lock to operate.

[0007] Preferably, the first reduction gear set includes a first gear and a second gear meshing with each other, the first gear is fixed at the first gear position on the input shaft, the second gear is rotatably set at the first gear position on the intermediate shaft, and the number of teeth of the second gear is greater than the number of teeth of the first gear.

[0008] Preferably, the second reduction gear set includes a third gear and a fourth gear meshing with each other, the third gear is fixed at the second gear position on the input shaft, the fourth gear is rotatably arranged at the second gear position on the intermediate shaft, and the number of teeth of the fourth gear is greater than that of the third gear.

[0009] Preferably, the shift mechanism comprises a movable gear sleeve, and the gear sleeve is combined with the second gear or the fourth gear by movement.

[0010] Preferably, the reduction planetary gear train comprises a planet carrier, and the input shaft is fixed on the planet carrier.

[0011] Preferably, a fifth gear is fixedly provided on the intermediate shaft, the fifth gear is meshed with the main reduction gear, and the number of teeth of the fifth gear is smaller than the number of teeth of the main reduction gear.

[0012] As described above, the present invention relates to a reduction gearbox for a vehicle, which has the following beneficial effects:

[0013] When the first gear is needed, the shift mechanism is connected to the first reduction gear set, and the torque is transmitted to the reduction planetary gear train through the motor to achieve the first stage of reduction. The reduction planetary gear train outputs the torque to the input shaft, and the input shaft drives the first reduction gear set to rotate to achieve the second stage of reduction, and transmits the torque to the intermediate shaft. The intermediate shaft drives the main reduction mechanism to achieve the third stage of reduction, and the torque is transmitted to the driving half shaft through the differential lock through the main reduction mechanism, so as to provide a larger output torque for the vehicle to start or get out of trouble. When the second gear is needed, the shift mechanism is connected to the second reduction gear set, and the input shaft drives the second reduction gear set to rotate and transmits the torque to the intermediate shaft. The intermediate shaft drives the main reduction mechanism to achieve the third stage of reduction, so as to reduce the speed ratio and increase the maximum speed of the whole vehicle. The present invention effectively improves the utilization rate and torque density of the gears, reduces the envelope size of the reduction box body, and reduces the space occupied by the reduction box body on the vehicle, so as to improve the utilization rate of the vehicle space, and effectively reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A reduction gear box for a vehicle provided in accordance with an embodiment of the present invention includes a schematic diagram of a gear structure of a first gear power flow.

[0015] Figure 2 A reduction gear box for a vehicle provided in accordance with an embodiment of the present invention includes a schematic diagram of a gear structure of a second gear power flow.

[0016] Description of reference numerals:

[0017] 100, reduction gear box body; 200, reduction planetary gear train; 210, planet carrier; 220, sun gear; 230, planetary gear; 240, ring gear assembly; 300, input shaft; 400, intermediate shaft; 410, fifth gear; 500, differential lock; 600, shift mechanism; 700, first reduction gear set; 710, first gear; 720, second gear; 800, second reduction gear set; 810, third gear; 820, fourth gear; 900, main reduction gear. DETAILED DESCRIPTION

[0018] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0019] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0020] like Figure 1 and Figure 2 As shown, a reduction gearbox for a vehicle includes a reduction planetary gear train 200, an input shaft 300, an intermediate shaft 400, a differential lock 500, a shift mechanism 600, a first reduction gear set 700, and a second reduction gear set 800 arranged in a reduction gearbox housing 100. The reduction planetary gear train 200 and the input shaft 300 are sequentially arranged in the reduction gearbox housing 100 in the transverse direction. The reduction planetary gear train 200 is connected to the power input end of the reduction gearbox, and the input shaft 300 is connected to the reduction planetary gear train 200. The input shaft 300 is coaxial with the reduction planetary gear train 200 to reduce the transverse envelope size of the reduction gearbox. The power input end of the reduction gearbox is connected to the reduction planetary gear train 200 by the motor shaft, and the torque is transmitted to the reduction planetary gear train 200 by the motor to form a first-stage reduction. The intermediate shaft 400 is arranged in the reduction gearbox housing 100 and distributed in the longitudinal direction. The intermediate shaft 400 is arranged in parallel with the input shaft 300. The first reduction gear set 700 is arranged on the input shaft 300 and the intermediate shaft 400 to form the second stage of reduction, and the second reduction gear set 800 is arranged on the input shaft 300 and the intermediate shaft 400. The shift mechanism 600 is arranged on the intermediate shaft 400 between the first reduction gear set 700 and the second reduction gear set 800. The shift mechanism 600 selectively connects one of the first reduction gear set 700 and the second reduction gear set 800, and the intermediate shaft 400 drives the main reduction mechanism to operate to form the third stage of reduction. Finally, the main reduction mechanism drives the differential lock 500 to operate, and transmits the torque to the half shaft connected to the differential lock 500. Among them, the shift mechanism 600 is preferably a dog clutch electronic shift mechanism.

[0021] Specifically, when the car needs to start or get out of trouble through the first gear, such as Figure 1As shown, the shift mechanism 600 is connected with the first reduction gear set 700, and the torque is transmitted to the reduction planetary gear train 200 through the motor to achieve the first stage of reduction. The reduction planetary gear train 200 then outputs the torque to the input shaft 300, and the first reduction gear set 700 is driven by the input shaft 300 to rotate to achieve the second stage of reduction, and the torque of the input shaft 300 is transmitted to the intermediate shaft 400 through the first reduction gear set 700. Finally, the intermediate shaft 400 drives the main reduction mechanism to achieve the third stage of reduction, and at the same time generates a large speed ratio of more than 20 (i.e., the gear ratio of the main reducer in the automobile drive axle), provides high output torque, and transmits the torque to the drive half shaft through the differential lock through the main reduction mechanism, so that the automobile can easily get out of trouble and start in the first gear.

[0022] When the car starts, if you need to increase the driving speed through the second gear, such as Figure 2 As shown, the shift mechanism 600 is connected to the first reduction gear set 700 and then the shift mechanism 600 is connected to the second reduction gear set 800. The torque is transmitted to the reduction planetary gear train 200 through the motor to achieve the first stage of reduction. The reduction planetary gear train 200 then transmits the torque to the input shaft 300, and the second reduction gear set 800 is driven to rotate by the input shaft 300, and the torque of the input shaft 300 is transmitted to the intermediate shaft 400 through the second reduction gear set 800. At this time, compared with the torque transmitted from the input shaft 300 to the intermediate shaft 400 in the first gear state, the torque in the second gear state is lower. Finally, the intermediate shaft 400 drives the main reduction mechanism to achieve three-stage reduction to achieve a small speed ratio, and the torque is transmitted to the driving half shaft through the differential lock through the main reduction mechanism, effectively improving the maximum speed of the vehicle.

[0023] It should be noted that the present embodiment presents a three-axis three-stage two-gear arrangement as a whole, and has a compact structure, which effectively reduces the envelope size of the reduction box, effectively reduces the space occupied by the reduction box on the vehicle, and improves the utilization rate of the vehicle space. At the same time, it also avoids the situation where the gears are not necessarily idling.

[0024] In one embodiment, if Figure 1 and Figure 2 As shown, a first gear and a second gear are provided on the input shaft 300, and the first reduction gear set 700 includes a first gear 710 and a second gear 720 meshing with each other. The first gear 710 is fixed at the first gear on the input shaft 300, and the second gear 720 is rotatably provided at the first gear on the intermediate shaft 400, and the number of teeth of the second gear 720 is greater than the number of teeth of the first gear 710.

[0025] Specifically, when in the first gear, the input shaft 300 drives the first gear 710 to rotate, that is, the first gear 710 rotates as a driving wheel, and the first gear 710 drives the second gear 720 (i.e., the driven wheel) meshing therewith, thereby realizing the second stage of deceleration and increasing the torque of the intermediate shaft 400 at the same time.

[0026] Furthermore, if Figure 2 As shown, the second reduction gear set 800 includes a third gear 810 and a fourth gear 820 that mesh with each other, the third gear 810 is fixed at the second gear position on the input shaft 300, and the fourth gear 820 is rotatably set at the second gear position on the intermediate shaft 400, and the number of teeth of the fourth gear 820 is greater than the number of teeth of the third gear 810.

[0027] Specifically, when in the second gear position, the input shaft 300 drives the third gear 810 (ie, the driving wheel) to rotate, and the third gear 810 drives the fourth gear 820 (ie, the driven wheel) to rotate, so as to increase the torque of the intermediate shaft 400 .

[0028] Furthermore, the shift mechanism 600 includes a movable gear sleeve, which is combined with the second gear 720 or the fourth gear 820 through the action of the shift fork. When the gear sleeve is connected to the second gear 720, the first gear shift is realized; when the gear sleeve is connected to the fourth gear 820, the second gear shift is realized.

[0029] In one embodiment, if Figure 1 and Figure 2 As shown, the reduction planetary gear train 200 includes a planet carrier 210, a sun gear 220, a plurality of planetary gears 230 and a ring gear assembly 240, each of which is meshed with the sun gear 220 and the ring gear assembly 240, wherein the number of teeth of the ring gear assembly 240 is greater than the number of teeth of the sun gear 220, so as to achieve the first stage of reduction. The ring gear assembly 240 is fixedly connected to the reduction gear box body 100, and the input shaft 300 is fixedly arranged on the planet carrier 210, so as to meet the planet carrier 210 to transmit the torque to the input shaft 300.

[0030] In one embodiment, the intermediate shaft 400 is fixed with a fifth gear 410, which meshes with the main reduction gear 900, and the number of teeth of the fifth gear 410 is less than that of the main reduction gear. When in use, when in the first gear state, the intermediate shaft 400 drives the fifth gear 410 to rotate to achieve the third stage of reduction, so as to provide high torque to the driving half shaft; when in the second gear state, the intermediate shaft 400 drives the fifth gear 410 to rotate to achieve the third stage of reduction, which can achieve a smaller speed ratio and effectively increase the maximum speed of the vehicle.

[0031] In summary, the present invention can improve the utilization rate and torque density of gears, reduce the envelope size of the reduction gear box, and reduce the space occupied by the reduction gear box on the vehicle, so as to improve the utilization rate of the vehicle space and effectively reduce costs.

[0032] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A reduction gearbox for a vehicle, characterized in that: The invention comprises a reduction planetary gear train (200) and an input shaft (300), wherein the reduction planetary gear train (200) and the input shaft (300) are sequentially arranged in a reduction gear box body (100) along the transverse direction, the reduction planetary gear train (200) is connected to the power input end of the reduction gear box, the input shaft (300) is connected to the reduction planetary gear train (200), and the input shaft (300) is coaxial with the reduction planetary gear train (200).

2. The reduction gearbox for a vehicle according to claim 1, characterized in that: The reduction gearbox further comprises an intermediate shaft (400), a differential lock (500), a shift mechanism (600), a first reduction gear set (700) and a second reduction gear set (800); the intermediate shaft (400) is arranged in parallel with the input shaft (300); the first reduction gear set (700) is arranged on the input shaft (300) and the intermediate shaft (400) to form a second stage reduction; the second reduction gear set (800) is arranged on the input shaft (300) and the intermediate shaft (400); the shift mechanism (600) selectively connects one of the first reduction gear set (700) and the second reduction gear set (800); the intermediate shaft (400) drives the main reduction gear set to operate to form a third stage reduction, and the main reduction gear set drives the differential lock (500) to operate.

3. The reduction gearbox for a vehicle according to claim 2, characterized in that: The first reduction gear set (700) comprises a first gear (710) and a second gear (720) meshing with each other, the first gear (710) being fixedly arranged at a first gear position on the input shaft (300), the second gear (720) being rotatably arranged at a first gear position on the intermediate shaft (400), and the number of teeth of the second gear (720) being greater than the number of teeth of the first gear (710).

4. The reduction gearbox for a vehicle according to claim 2, characterized in that: The second reduction gear set (800) comprises a third gear (810) and a fourth gear (820) meshing with each other, the third gear (810) being fixedly arranged at a second gear position on the input shaft (300), the fourth gear (820) being rotatably arranged at a second gear position on the intermediate shaft (400), and the number of teeth of the fourth gear (820) being greater than the number of teeth of the third gear (810).

5. The reduction gearbox for a vehicle according to claims 3 and 4, characterized in that: The shift mechanism (600) comprises a movable gear sleeve, and the gear sleeve is combined with the second gear (720) or the fourth gear (820) by movement.

6. The reduction gearbox for a vehicle according to claim 1, characterized in that: The reduction planetary gear train (200) comprises a planet carrier (210), and the input shaft (300) is fixedly mounted on the planet carrier (210).

7. The reduction gearbox for a vehicle according to any one of claims 1 to 6, characterized in that: A fifth gear (410) is fixedly disposed on the intermediate shaft (400), the fifth gear (410) is meshed with the main reduction gear (900), and the number of teeth of the fifth gear (410) is smaller than the number of teeth of the main reduction gear (900).

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