Vehicle speed change device and use method thereof

Abstract

The invention relates to the technical field of transmissions, and discloses a vehicle speed change device and a using method thereof.The vehicle speed change device comprises a shell, an input rotating shaft, an output rotating shaft, a first planet row assembly, a second planet row assembly, a third planet row assembly, a fourth planet row assembly, a first clutch, a second clutch, a third clutch and a fourth clutch; the input rotating shaft is connected with the second clutch and the second planet carrier. The first planet carrier is connected with the first clutch through a second rotating shaft, and the first sun gear is connected with the inner wall of the shell through a brake; when a P gear is engaged or a transfer case is engaged, the actuator, the second clutch and the fourth clutch are closed, and the third clutch and the first clutch are released, so that the input rotating shaft and the output rotating shaft are subjected to power isolation, abnormal sound generated during combination due to rotation of the output rotating shaft is avoided, and the technical problem that the driving feeling is influenced in the prior art is solved; the technical effects that gear shifting is smoother, and abnormal sound is small are achieved.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, and in particular to a vehicle transmission device and its method of use. Background Technology

[0002] Currently, many vehicle models are equipped with automatic transmissions (AT). At the output end of an AT transmission, a power take-off (PTO) or a transfer case for four-wheel drive can be optionally installed. The input end of the PTO or transfer case is related to the output end of the transmission. They need to ensure that the input shaft speed is within a certain range to meet the vehicle's requirements, and that the normal gear shifting operation of the transfer case can be guaranteed when the torque input is almost zero. Therefore, the output end of the AT transmission must ensure certain speed and torque requirements.

[0003] In addition, in some automatic transmissions with a P gear requirement, when engaging P gear, the output shaft speed and torque need to be within a certain range to ensure smoother gear shifting and prevent damage to transmission and other components.

[0004] However, existing transmissions cannot completely disconnect the output shaft from the input shaft when the power take-off or transfer case needs to operate or when the P gear needs to be engaged. This results in significant abnormal noise when engaging P gear or shifting gears in the transfer case, thus affecting the user's driving experience. Summary of the Invention

[0005] The purpose of this invention is to provide a vehicle transmission device and its usage method, thereby solving the technical problems in the prior art that affect the driving experience.

[0006] To solve the above-mentioned technical problems, the present invention provides a vehicle transmission device, comprising: a housing, an input shaft, an output shaft, a first planetary gear assembly, a second planetary gear assembly, a third planetary gear assembly, a fourth planetary gear assembly, a first clutch, a second clutch, a third clutch, and a fourth clutch; The first planetary gear set includes a first sun gear, a first planetary gear, a first planet carrier, and a first ring gear; the second planetary gear set includes a second sun gear, a second planetary gear, a second planet carrier, and a second ring gear; the third planetary gear set includes a third sun gear, a third planetary gear, a third planet carrier, and a third ring gear; the fourth planetary gear set includes a fourth sun gear, a fourth planetary gear, a fourth planet carrier, and a fourth ring gear. The input shaft is connected to the second clutch and the second planetary carrier, respectively. The first planetary carrier is connected to the first clutch via a second rotating shaft, the first gear ring is fixedly mounted on the inner wall of the housing, and the first sun gear is connected to the inner wall of the housing via a brake. The second gear ring is connected to the third sun gear via a third rotating shaft; The third rotating shaft is connected to the fourth clutch via the fifth rotating shaft, the fourth clutch is mounted on the sixth rotating shaft, and the third planetary carrier is connected to the third clutch via the fourth rotating shaft; The third gear ring is connected to the fourth sun gear via the sixth rotating shaft; The second clutch is mounted on the sixth shaft; The fourth planetary carrier is connected to the third clutch via the seventh rotating shaft, and the output rotating shaft is connected to the fourth planetary carrier via a transmission. The fourth gear ring is connected to the first clutch via the eighth rotating shaft.

[0007] In an optional embodiment, the first sun gear is connected to the brake via a first shaft.

[0008] In an optional implementation, the input shaft and the output shaft are coaxially arranged.

[0009] In an optional embodiment, a speed measuring device is provided on the housing and connected to the housing. The speed measuring device is used to measure the rotational speed of the input shaft and the output shaft.

[0010] In an optional embodiment, a hydraulic assembly is further included, which is connected to the brake, the first clutch, the second clutch, the third clutch, and the fourth clutch, respectively, and the hydraulic assembly is used to provide oil pressure to the brake, the first clutch, the second clutch, the third clutch, and the fourth clutch.

[0011] In optional implementations, a power component and an output component are also included; The power assembly is connected to the input shaft, and the power assembly is used to drive the input shaft to rotate; The output component is connected to the output shaft, and the output shaft is used to drive the output component to move.

[0012] In an optional embodiment, the output end of the power assembly is further provided with a hydraulic torque converter, which is connected to both the power assembly and the input shaft.

[0013] In an optional embodiment, a detection component is further included, which is connected to the first clutch, the second clutch, the third clutch, the fourth clutch and the brake respectively, and the detection component is used to detect the operating status of the first clutch, the second clutch, the third clutch, the fourth clutch and the brake.

[0014] The present invention also provides a method of using the vehicle transmission device, comprising the following steps: When the transmission needs to be engaged in P gear, or when the transfer case needs to be engaged: Inspect the vehicle's operating status; When the vehicle is in normal working condition, the brake, second clutch and fourth clutch are engaged, and the first clutch and third clutch are disengaged. At this time, the input shaft and output shaft are separated, so that the transmission can be smoothly engaged in P gear, or the transfer case can be smoothly engaged in gear. If the vehicle malfunctions, promptly alert the driver.

[0015] In an optional implementation, the detection of the vehicle's operating status includes: Check whether the temperature of the first clutch, second clutch, third clutch, fourth clutch and brake is normal and whether there is slippage; Check if the hydraulic torque converter is slipping and if the temperature is normal; Check if the vehicle's throttle opening is greater than 5%; Check if the vehicle speed is greater than 5 km / h.

[0016] This invention provides a vehicle transmission device, comprising: a housing, an input shaft, an output shaft, a first planetary gear set assembly, a second planetary gear set assembly, a third planetary gear set assembly, a fourth planetary gear set assembly, a first clutch, a second clutch, a third clutch, and a fourth clutch; the first planetary gear set assembly includes a first sun gear, a first planetary gear, a first planet carrier, and a first ring gear; the second planetary gear set assembly includes a second sun gear, a second planetary gear, a second planet carrier, and a second ring gear; the third planetary gear set assembly includes a third sun gear, a third planetary gear, a third planet carrier, and a third ring gear; the fourth planetary gear set assembly includes a fourth sun gear, a fourth planetary gear, a fourth planet carrier, and a fourth ring gear; the input shaft is connected to the second clutch and the second planet carrier respectively; the first planet carrier is connected to the first clutch via the second shaft; the first ring gear is fixedly mounted on the inner wall of the housing; and the first sun gear is connected to the first clutch via a brake. The inner wall of the housing is connected; the second gear ring is connected to the third sun gear via the third shaft; the third shaft is connected to the fourth clutch via the fifth shaft, the fourth clutch is mounted on the sixth shaft, the third planetary carrier is connected to the third clutch via the fourth shaft; the third gear ring is connected to the fourth sun gear via the sixth shaft; the second clutch is mounted on the sixth shaft; the fourth planetary carrier is connected to the third clutch via the seventh shaft, and the output shaft is connected to the fourth planetary carrier via a drive connection; the fourth gear ring is connected to the first clutch via the eighth shaft. When the P gear is engaged or the transfer case is engaged, the actuator, the second clutch, and the fourth clutch are closed, and the third clutch and the first clutch are released, so that the input shaft and the output shaft are power isolated, avoiding abnormal noise caused by the rotation of the output shaft during engagement. This solves the technical problem of affecting the driving experience in the prior art, and achieves the technical effect of smoother shifting and less abnormal noise. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the vehicle transmission device mentioned in the embodiments of the present invention.

[0018] In the diagram, P1 is the first planetary gear set; 10 is the first sun gear; 11 is the first planetary carrier; 12 is the first ring gear; P2 is the second planetary gear set; 20 is the second sun gear; 21 is the second planetary carrier; 22 is the second ring gear; P3 is the third planetary gear set; 30 is the third sun gear; 31 is the third planetary carrier; 32 is the third ring gear; P4 is the fourth planetary gear set; 40 is the fourth sun gear; 41 is the fourth planetary carrier; 42 is the fourth ring gear; 50 is the housing; 51 is the input shaft; 52 is the output shaft; 60 is the brake; 61 is the first clutch; 62 is the second clutch; 63 is the third clutch; 64 is the fourth clutch; 71 is the first shaft; 72 is the second shaft; 73 is the third shaft; 74 is the fourth shaft; 75 is the fifth shaft; 76 is the sixth shaft; 77 is the seventh shaft; 78 is the eighth shaft; 80 is the power unit; 90 is the output unit; 100 is the torque converter. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In some related technologies, automatic transmissions (AT) with a Parking (P) gear requirement need to maintain a certain range of output shaft speed and torque when engaging P to ensure smooth shifting and prevent damage to transmission components. However, existing transmissions, when the power take-off (P) or transfer case requires hydraulic operation, or when engaging P, cannot completely disconnect the output shaft from the input shaft. This results in significant abnormal noise when engaging P or shifting gears in the transfer case, thus affecting the driver's driving experience.

[0022] In view of this, such as Figure 1 As shown, some embodiments of the present invention provide a vehicle transmission device, including: a housing 50, an input shaft 51, an output shaft 52, a first planetary gear assembly P1, a second planetary gear assembly P2, a third planetary gear assembly P3, a fourth planetary gear assembly P4, a first clutch 61, a second clutch 62, a third clutch 63, and a fourth clutch 64.

[0023] The first planetary gear assembly P1 includes a first sun gear 10, a first planetary gear, a first planet carrier 11, and a first ring gear 12; the second planetary gear assembly P2 includes a second sun gear 20, a second planetary gear, a second planet carrier 21, and a second ring gear 22; the third planetary gear assembly P3 includes a third sun gear 30, a third planetary gear, a third planet carrier 31, and a third ring gear 32; and the fourth planetary gear assembly P4 includes a fourth sun gear 40, a fourth planetary gear, a fourth planet carrier 41, and a fourth ring gear 42.

[0024] The input shaft 51 is connected to the second clutch 62 and the second planetary carrier 21 respectively; the first planetary carrier 11 is connected to the first clutch 61 via the second shaft 72; the first ring gear 12 is fixedly mounted on the inner wall of the housing 50; the first sun gear 10 is connected to the inner wall of the housing 50 via the brake 60; the second ring gear 22 is connected to the third sun gear 30 via the third shaft 73; the third shaft 73 is connected to the fourth clutch 64 via the fifth shaft 75; the fourth clutch 64 is mounted on the sixth shaft 76; the third planetary carrier 31 is connected to the third clutch 63 via the fourth shaft 74; the third ring gear 32 is connected to the fourth sun gear 40 via the sixth shaft 76; the second clutch 62 is mounted on the sixth shaft 76; the fourth planetary carrier 41 is connected to the third clutch 63 via the seventh shaft 77; the output shaft 52 is connected to the fourth planetary carrier 41 in a transmission connection; the fourth ring gear 42 is connected to the first clutch 61 via the eighth shaft 78.

[0025] In an optional embodiment, the first sun gear 10 is connected to the brake 60 via a first shaft 71.

[0026] In the above embodiment, the first rotating shaft 71 can be fixed by closing the actuator, thereby fixing the first sun gear 10.

[0027] In an optional implementation, the input shaft 51 and the output shaft 52 are coaxially arranged.

[0028] In the above embodiments, both the input shaft 51 and the output shaft 52 are in the shape of metal cylinders, and the axes of the input shaft 51 and the output shaft 52 coincide, which can make the transmission occupy a smaller volume.

[0029] In an optional embodiment, a speed measuring device is provided on the housing 50 and connected to the housing 50. The speed measuring device is used to measure the rotational speed of the input shaft 51 and the output shaft 52.

[0030] In the above embodiment, the speed sensor can measure the rotational speed of the input shaft 51 and the output shaft 52 respectively, and the speed sensor can infer the throttle opening and vehicle speed by measuring the rotational speed of the input shaft 51 and the output shaft 52.

[0031] In an optional embodiment, a hydraulic assembly is also included, which is connected to the brake 60, the first clutch 61, the second clutch 62, the third clutch 63 and the fourth clutch 64 respectively, and is used to provide oil pressure to the brake 60, the first clutch 61, the second clutch 62, the third clutch 63 and the fourth clutch 64.

[0032] In the above embodiments, the hydraulic components may include an oil pump and an oil reservoir. The oil pump can selectively supply oil from the oil reservoir to the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64, and the actuator, thereby controlling the engagement and disengagement of the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64, and the actuator.

[0033] In an optional embodiment, a power component 80 and an output component 90 are also included; the power component 80 is connected to the input shaft 51 and is used to drive the input shaft 51 to rotate; the output component 90 is connected to the output shaft 52 and is used to drive the output component 90 to move.

[0034] In the above embodiments, the power assembly 80 may include an engine or an electric motor, and the output assembly 90 may include a rear axle, a differential, and a transfer case. The power assembly 80 is used to drive the input shaft 51 to rotate, while the output shaft 52 can drive the internal movement of the output assembly 90 and distribute power to the tires.

[0035] In an optional embodiment, a hydraulic torque converter 100 is also provided at the output end of the power assembly 80, and the hydraulic torque converter 100 is connected to the power assembly 80 and the input shaft 51 respectively.

[0036] In the above embodiment, the two ends of the hydraulic torque converter 100 are respectively connected to the output end of the power assembly 80 and the end of the input shaft 51 that is away from the output shaft 52. The hydraulic torque converter 100 can avoid the impact of the power assembly 80 on the transmission.

[0037] In an optional embodiment, a detection component is also included. The detection component is connected to the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64 and the brake 60 respectively. The detection component is used to detect the working status of the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64 and the brake 60.

[0038] In the above embodiments, the detection component may include a temperature sensor and a speed measuring instrument. The temperature sensor is used to measure the temperature of the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64 and the brake 60 to avoid overheating. It can also detect the rotational speeds on both sides of the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64 and the brake 60, thereby detecting whether the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64 and the brake 60 are slipping.

[0039] Some embodiments of the present invention provide a vehicle transmission device, comprising: a housing 50, an input shaft 51, an output shaft 52, a first planetary gear assembly P1, a second planetary gear assembly P2, a third planetary gear assembly P3, a fourth planetary gear assembly P4, a first clutch 61, a second clutch 62, a third clutch 63, and a fourth clutch 64; the first planetary gear assembly P1 includes a first sun gear 10, a first planetary gear, a first planet carrier 11, and a first ring gear 12; the second planetary gear assembly P2 includes a second sun gear 20, a second planetary gear, a second planet carrier 21, and a second ring gear 22; the third planetary gear assembly P3 includes a third sun gear 30, a third planetary gear, a third planet carrier 31, and a third ring gear 32; and the fourth planetary gear assembly P4 includes a fourth sun gear 40, a fourth planetary gear, a fourth planet carrier 41, and a fourth ring gear 42.

[0040] The input shaft 51 is connected to the second clutch 62 and the second planetary carrier 21 respectively; the first planetary carrier 11 is connected to the first clutch 61 via the second shaft 72; the first ring gear 12 is fixedly mounted on the inner wall of the housing 50; the first sun gear 10 is connected to the inner wall of the housing 50 via the brake 60; the second ring gear 22 is connected to the third sun gear 30 via the third shaft 73; the third shaft 73 is connected to the fourth clutch 64 via the fifth shaft 75; the fourth clutch 64 is mounted on the sixth shaft 76; the third planetary carrier 31 is connected to the third clutch 63 via the fourth shaft 74; the third ring gear 32 is connected to the fourth sun gear 40 via the sixth shaft 76; the second Clutch 62 is mounted on the sixth rotating shaft 76; the fourth planetary carrier 41 is connected to the third clutch 63 via the seventh rotating shaft 77, and the output shaft 52 is drivenly connected to the fourth planetary carrier 41; the fourth ring gear 42 is connected to the first clutch 61 via the eighth rotating shaft 78. When the P gear is engaged or the transfer case is engaged, the third clutch 63 and the first clutch 61 are released by closing the actuator, the second clutch 62 and the fourth clutch 64, thereby isolating the input shaft 51 and the output shaft 52. This prevents the output shaft 52 from rotating and causing abnormal noise during engagement, thus solving the technical problem of affecting driving experience in the prior art and achieving a smoother shifting and less abnormal noise.

[0041] Some embodiments of the present invention also provide a method of using a vehicle transmission device, including the following steps: when the transmission needs to be engaged in P gear or the transfer case needs to be engaged: detect the vehicle's operating status; when the vehicle's operating status is normal, engage the brake 60, the second clutch 62 and the fourth clutch 64, and disengage the first clutch 61 and the third clutch 63. At this time, the input shaft 51 and the output shaft 52 are separated, so that the transmission can be smoothly engaged in P gear or the transfer case can be smoothly engaged; when the vehicle's operating status is abnormal, promptly alert the driver.

[0042] In an optional implementation, detecting the vehicle's operating status includes: detecting whether the temperatures of the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64, and the brake 60 are normal and whether they are slipping; detecting whether the torque converter 100 is slipping and whether its temperature is normal; detecting whether the vehicle's throttle opening is greater than 5%; and detecting whether the vehicle speed is greater than 5 km / h.

[0043] Engaging brake 60, second clutch 62, and fourth clutch 64, and disengaging first clutch 61 and third clutch 63, the separation of input shaft 51 and output shaft 52 can trigger a function. The function triggering strategy is mainly for requests from the entire vehicle or special requests from the transmission, requiring the output shaft 52 to be controlled within a certain speed range. This ensures that when engaging brake 60, second clutch 62, and fourth clutch 64, and disengaging first clutch 61 and third clutch 63, the output shaft 52's speed and torque are 0. The following function enable triggering strategy is based on signals from the transmission TCU (Transmission Control Unit) and related control signals, speed sensors, and detection components received from the CAN (Controller Area Network).

[0044] The prerequisite for engaging the brake 60, the second clutch 62, and the fourth clutch 64, and disengaging the first clutch 61 and the third clutch 63, is as follows: The first clutch 61, second clutch 62, third clutch 63, fourth clutch 64 and brake 60 in the current transmission do not have any slippage or overheating faults. In order to control the shifting elements more accurately, it is necessary to ensure that the shifting elements are working properly. After a certain amount of pressure is applied, it can ensure that shifting and other operations are performed according to the current transmission structure and principle.

[0045] The torque converter 100 has no normally open, normally closed, or burn-out faults. The torque converter 100 is at the very front of the transmission. If the torque converter 100 malfunctions, it will affect its opening and closing requirements under different operating conditions. For example, in this strategy, it is essential to ensure that the torque converter 100 responds to the TCU's request to open or engage the sliding diaphragm control; otherwise, the power input to the transmission will be abnormal, such as the engine stalling or the motor failing to generate electricity. Abnormal operation of the torque converter 100 can lead to hardware damage to the power unit 80 or the transmission itself; therefore, monitoring is necessary.

[0046] The speedometer and tachometer are functioning correctly, as are the associated wiring harnesses. They are used to detect the rotational speeds of the input shaft 51 and the output shaft 52, and can be used to calculate vehicle speed and throttle opening. They are used to determine whether the rotational speed of the transmission's output shaft 52 meets the conditions for engaging P gear and shifting gears in the transfer case.

[0047] Currently, the system is activated based on a request from the driver to engage P gear, a need for the four-wheel drive transfer case to switch gears, or a request from the output component 90 to execute.

[0048] When the accelerator pedal opening is 0, it can be ensured that when it is necessary to engage P gear or switch gears in the transfer case, the torque of the output shaft 52 is 0, which ensures that the speed of the output shaft 52 can be reduced quickly, and the operation of engaging P gear and switching gears in the transfer case will be performed smoothly under no load.

[0049] If the current vehicle speed or the rotational speed of the output shaft 52 is below a certain safe range, such as a vehicle speed below 3 km / h, the operation of engaging P gear and shifting gears in the transfer case can be performed. If the vehicle speed is too high (greater than 20 km / h), the operation of engaging P gear and shifting gears in the transfer case will take longer due to rotational inertia, and because the output end of the transmission output assembly 90 is connected to the drive shaft and wheels, the rotational speed of the output shaft 52 will decrease more slowly.

[0050] The brake pedal is in the depressed position. This condition is also to ensure the safety of the vehicle's drivetrain when shifting into Park (P) or changing gears in the transfer case. Continuing to brake ensures safety once the vehicle speed or the output component's RPM drops to a safe range, until shifting into Park or changing gears in the transfer case can be safely performed.

[0051] If all the above conditions are met, the strategy of engaging the brake 60, the second clutch 62 and the fourth clutch 64, and disengaging the first clutch 61 and the third clutch 63 can be implemented to first ensure the torque unloading of the output shaft 52, and then the speed of the output shaft 52 can be quickly reduced to a certain range, so that the P gear can be engaged and the transfer case can be engaged.

[0052] The conditions for exiting the shift strategy are: The gear shifting requirement is to engage P gear and complete the gear change in the four-wheel drive transfer case. Eliminate the need for gear shifting via P gear and the four-wheel drive transfer case; The throttle opening is greater than a certain value, for example, 5%; The vehicle speed exceeds a certain value, for example, 5 km / h; Among the shifting components, the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64, and the brake 60 are faulty; The hydraulic torque converter 100 has a fault, such as a normally open fault, a normally closed fault, or a burn-out fault. The speed sensor of input shaft 51 or output shaft 52 is faulty, or the wiring harness associated with the speed sensor is faulty, making it impossible to accurately obtain the rotational speed of input shaft 51 and output shaft 52, or to accurately measure the vehicle speed.

[0053] If any of the above conditions are met, the shifting strategy of the first clutch 61, the second clutch 62, the third clutch 63, the fourth clutch 64, and the brake 60 must be immediately disengaged, and the vehicle must be returned to neutral. That is, the actuator and the first clutch 61 are closed, the second clutch 62, the third clutch 63, and the fourth clutch 64 are open, and neutral is sent to the instrument panel. The instrument panel will then prompt the driver that "the current shifting strategy of engaging P gear or the transfer case is disengaged or cannot be executed," so as to inform the driver that there is a malfunction in the vehicle and that it needs to be inspected and repaired.

[0054] The shifting logic of the vehicle's transmission is as follows:

[0055] In this gear selection, N represents neutral, R represents reverse, D1 represents first gear, D2 represents second gear, D3 represents third gear, D4 represents fourth gear, D5 represents fifth gear, D6 represents sixth gear, D7 represents seventh gear, and D8 represents eighth gear. Different gears are achieved by engaging and disengaging different clutches and brakes.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vehicle transmission device, characterized in that, include: Housing, input shaft, output shaft, first planetary gear assembly, second planetary gear assembly, third planetary gear assembly, fourth planetary gear assembly, first clutch, second clutch, third clutch, and fourth clutch; The first planetary gear set includes a first sun gear, a first planetary gear, a first planet carrier, and a first ring gear; the second planetary gear set includes a second sun gear, a second planetary gear, a second planet carrier, and a second ring gear; the third planetary gear set includes a third sun gear, a third planetary gear, a third planet carrier, and a third ring gear; the fourth planetary gear set includes a fourth sun gear, a fourth planetary gear, a fourth planet carrier, and a fourth ring gear. The input shaft is connected to the second clutch and the second planetary carrier, respectively. The first planetary carrier is connected to the first clutch via a second rotating shaft, the first gear ring is fixedly mounted on the inner wall of the housing, and the first sun gear is connected to the inner wall of the housing via a brake. The second gear ring is connected to the third sun gear via a third rotating shaft; The third rotating shaft is connected to the fourth clutch via the fifth rotating shaft, the fourth clutch is mounted on the sixth rotating shaft, and the third planetary carrier is connected to the third clutch via the fourth rotating shaft; The third gear ring is connected to the fourth sun gear via the sixth rotating shaft; The second clutch is mounted on the sixth shaft; The fourth planetary carrier is connected to the third clutch via the seventh rotating shaft, and the output rotating shaft is connected to the fourth planetary carrier via a transmission. The fourth gear ring is connected to the first clutch via the eighth rotating shaft.

2. The vehicle transmission device according to claim 1, characterized in that, The first sun gear is connected to the brake via a first shaft.

3. The vehicle transmission device according to claim 1, characterized in that, The input shaft and the output shaft are coaxially arranged.

4. The vehicle transmission device according to claim 1, characterized in that, A speed measuring device is provided on the housing and is connected to the housing. The speed measuring device is used to measure the rotational speed of the input shaft and the output shaft.

5. The vehicle transmission device according to claim 1, characterized in that, It also includes a hydraulic assembly connected to the brake, the first clutch, the second clutch, the third clutch and the fourth clutch respectively, the hydraulic assembly being used to provide oil pressure to the brake, the first clutch, the second clutch, the third clutch and the fourth clutch.

6. The vehicle transmission device according to claim 1, characterized in that, It also includes power components and output components; The power assembly is connected to the input shaft, and the power assembly is used to drive the input shaft to rotate; The output component is connected to the output shaft, and the output shaft is used to drive the output component to move.

7. The vehicle transmission device according to claim 6, characterized in that, The output end of the power assembly is also provided with a hydraulic torque converter, which is connected to both the power assembly and the input shaft.

8. The vehicle transmission device according to claim 1, characterized in that, It also includes a detection component, which is connected to the first clutch, the second clutch, the third clutch, the fourth clutch and the brake respectively. The detection component is used to detect the working status of the first clutch, the second clutch, the third clutch, the fourth clutch and the brake.

9. A method of using a vehicle transmission device based on any one of claims 1-8, characterized in that, Includes the following steps: When the transmission needs to be engaged in P gear, or when the transfer case needs to be engaged: Inspect the vehicle's operating status; When the vehicle is in normal working condition, the brake, second clutch and fourth clutch are engaged, and the first clutch and third clutch are disengaged. At this time, the input shaft and output shaft are separated, so that the transmission can be smoothly engaged in P gear, or the transfer case can be smoothly engaged in gear. If the vehicle malfunctions, promptly alert the driver.

10. The method of using the vehicle transmission device according to claim 9, characterized in that, The operating status of the inspection vehicle includes: Check whether the temperature of the first clutch, second clutch, third clutch, fourth clutch and brake is normal and whether there is slippage; Check if the hydraulic torque converter is slipping and if the temperature is normal; Check if the vehicle's throttle opening is greater than 5%; Check if the vehicle speed is greater than 5 km / h.

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