Limited slip differential electric drive axle based on one-way clutch

Abstract

The invention discloses a limited slip differential electric drive axle based on a one-way clutch. The limited slip differential electric drive axle comprises a drive axle shell, a drive motor, a planetary gear speed reduction mechanism, a right limited slip differential device, a left limited slip differential device, a main speed reduction cylindrical gear device, an intermediate shaft, an open differential mechanism, a left half shaft and a right half shaft. According to the limited-slip differential electric drive axle based on the one-way clutch, the limited-slip differential function of a vehicle can be automatically achieved through the power one-way transmission characteristic of the one-way clutch, excessive slip of wheels on one side is prevented, and the trafficability and active safety of the vehicle on severe road surfaces are improved.

Description

Technical Field

[0001] The invention belongs to the field of electric vehicle transmission, and in particular relates to a limited slip differential electric drive axle based on a one-way clutch. Background Art

[0002] Electric vehicles have the advantages of low carbon and environmental protection. The development of new energy vehicles is an important means to solve the current energy crisis and urban air pollution. At present, the electric vehicle drive system generally adopts a centralized axle drive system based on an open differential. This drive form has the advantages of mature and reliable technology and good layout inheritance. However, the working characteristics of the open differential are "differential but not torque difference", that is, the torque of the left and right half shafts of the drive axle is always the same, but the speed can be different. Although it can solve the kinematic incoordination of the wheels when the car turns, it can effectively avoid tire wear. However, the open differential always distributes the driving torque equally to the left and right wheels. When the vehicle is driving on a road with uneven road adhesion coefficients on the left and right sides, it is easy for the wheel on the side with a low road adhesion coefficient to slip, and the wheel on the side with a high road adhesion coefficient to lose power, affecting the vehicle's power, passability and safety.

[0003] To this end, it is necessary to invent an electric drive axle that can achieve a differential function between the left and right wheels when turning, while preventing excessive slippage of the wheels on one side, thereby improving the power, passability and safety of electric vehicles on harsh roads. Summary of the invention

[0004] The present invention provides a limited slip differential electric drive axle based on a one-way clutch. The main purpose of the present invention is to enable the electric drive axle to have a limited slip differential function through the automatic connection and disconnection of the active plate and the driven plate of the one-way clutch, so as to achieve the coordinated rotation of the left and right wheels when the vehicle is turning, avoid excessive wear of the tires, and prevent excessive slip of the wheels on one side when the vehicle is driving on bad roads, thereby improving the power, passability and safety of the electric vehicle under complex working conditions.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] The drive axle housing supports other components;

[0007] The driving motor is an inner rotor motor, comprising: a motor housing, a stator coil, a rotor, and a power output shaft;

[0008] The planetary gear reduction mechanism includes: a sun gear, a planetary gear, a planetary carrier, and a ring gear;

[0009] The right limited slip differential device comprises: a gear transmission mechanism 1, a one-way clutch 1;

[0010] The left-side limited slip differential device comprises: a second gear transmission mechanism and a second one-way clutch;

[0011] The main reduction cylindrical gear device comprises: a driving reduction gear and a driven reduction gear;

[0012] Intermediate shaft;

[0013] open differential;

[0014] Left half shaft;

[0015] Right half shaft.

[0016] Preferably, the power output shaft of the drive motor is connected to the sun gear of the planetary gear reduction mechanism via a spline, the planetary carrier of the planetary gear reduction mechanism is fixedly connected to the drive axle housing, the ring gear of the planetary gear reduction mechanism is connected to the right end of the intermediate shaft via a spline, and the left end of the intermediate shaft is supported by a bearing and connected to the drive axle housing.

[0017] Preferably, the gear transmission mechanism 1 of the right limited slip differential device comprises: a driving gear 1 and a driven gear 1, and the one-way clutch 1 of the right limited slip differential device comprises: a driving plate 1 and a driven plate 1;

[0018] The driving gear 1 is connected to the right half shaft through a spline, the driven gear 1 is connected to the outer ring of the driving plate 1 through a spline, and the driven plate 1 is connected to the intermediate shaft through a spline.

[0019] Preferably, the gear transmission mechanism 2 of the left limited slip differential device comprises: a second driving gear and a second driven gear, and the one-way clutch 2 of the left limited slip differential device comprises: a second driving plate and a second driven plate;

[0020] The second driving gear is connected to the left half shaft via a spline, the second driven gear is connected to the outer ring of the second driving plate via a spline, and the second driven plate is connected to the intermediate shaft via a spline.

[0021] Preferably, the driving reduction gear of the main reduction cylindrical gear device is connected to the intermediate shaft via a spline, and the driven reduction gear of the main reduction cylindrical gear device is connected to the housing of the open differential.

[0022] Preferably, the transmission ratio of the gear transmission mechanism 1 of the right limited slip differential device is The transmission ratio of the gear transmission mechanism 2 of the left limited slip differential device is The transmission ratio of the gear transmission mechanism 1 is exactly the same as and the transmission ratio of the gear transmission mechanism 2 Less than the transmission ratio of the main reduction cylindrical gear device ;

[0023] in, is the ratio of the number of teeth of the driven reduction gear of the main reduction cylindrical gear device to the number of teeth of the driving reduction gear of the main reduction cylindrical gear device, is the ratio of the number of teeth of the driving gear 1 of the gear transmission mechanism 1 to the number of teeth of the driven gear 1 of the gear transmission mechanism 1, It is the ratio of the number of teeth of the second driving gear of the second gear transmission mechanism to the number of teeth of the second driven gear of the second gear transmission mechanism.

[0024] Preferably, when the rotation speed of the active plate 1 of the one-way clutch 1 is greater than the rotation speed of the driven plate 1 of the one-way clutch 1, the one-way clutch 1 is engaged, and at this time, the one-way clutch-based limited slip differential electric drive axle can realize the limited slip function of the right half shaft;

[0025] When the rotation speed of the active plate 1 of the one-way clutch 1 is less than the rotation speed of the driven plate 1 of the one-way clutch 1, the one-way clutch 1 is disengaged, and at this time, the limited slip differential electric drive axle based on the one-way clutch realizes the differential function.

[0026] Preferably, when the rotation speed of the active plate 2 of the one-way clutch 2 is greater than the rotation speed of the driven plate 2 of the one-way clutch 2, the one-way clutch 2 is engaged, and at this time, the one-way clutch-based limited slip differential electric drive axle can realize the limited slip function of the left half shaft;

[0027] When the rotation speed of the active plate 2 of the one-way clutch 2 is less than the rotation speed of the driven plate 2 of the one-way clutch 2, the one-way clutch 2 is disengaged. At this time, the one-way clutch-based limited slip differential electric drive axle realizes the inter-wheel differential function.

[0028] The beneficial effects of the present invention are:

[0029] 1. The limited slip differential electric drive axle based on a one-way clutch described in the present invention can utilize the one-way power transmission function of the one-way clutch to realize the limited slip differential function of the drive axle, effectively avoid tire wear, and improve the power, passability and safety of electric vehicles when driving on harsh roads.

[0030] 2. The limited slip differential electric drive axle based on a one-way clutch described in the present invention can automatically realize the limited slip differential function according to the vehicle driving conditions without any auxiliary control unit. It has good adaptability to working conditions and reduces the cost and control complexity of the drive axle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1The schematic diagram of the component assembly of a limited slip differential electric drive axle based on a one-way clutch described in the present invention.

[0033] Figure 2 The schematic diagram is a structural diagram of a limited slip differential electric drive axle based on a one-way clutch according to the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0036] like Figure 1 As shown, the present invention provides a limited slip differential electric drive axle based on a one-way clutch, which is mainly composed of a drive motor 100, a drive axle housing 200, a planetary gear reduction mechanism 300, a right limited slip differential device 400, a main reduction cylindrical gear device 500, a left limited slip differential device 600, an intermediate shaft 700, a left half shaft 800, an open differential 900, and a right half shaft 1000.

[0037] like Figure 2 As shown, the drive motor 100 is an inner rotor motor, including: a power output shaft 101, a rotor 102, a stator coil 103, and a motor housing 104; the planetary gear reduction mechanism 300 includes: a sun gear 301, a planetary gear 302, a ring gear 303, and a planetary carrier 304; the right-side limited slip differential device 400 includes: a driving gear 1 401 of a gear transmission mechanism 1, a driven gear 1 402 of a gear transmission mechanism 1, a driving plate 1 403 of a one-way clutch 1, and a driven plate 1 404 of a one-way clutch 1; the main reduction cylindrical gear device 500 includes: a driving reduction gear 501 and a driven reduction gear 502; the left-side limited slip differential device 600 includes: a driving gear 1 601 of a gear transmission mechanism 2, a driven gear 2 602 of a gear transmission mechanism 2, a driving plate 2 603 of a one-way clutch 2, and a driven plate 2 604 of a one-way clutch 2.

[0038] like Figure 2As shown, the power output shaft 101 of the drive motor 100 is connected to the sun gear 301 of the planetary gear reduction mechanism 300 through a spline, the planet carrier 304 of the planetary gear reduction mechanism 300 is fixedly connected to the drive axle housing 200, the ring gear 303 of the planetary gear reduction mechanism 300 is connected to the right end of the intermediate shaft 700 through a spline, and the left end of the intermediate shaft 700 is supported by a bearing and connected to the drive axle housing 200. The driving gear 1 401 of the gear transmission mechanism 1 is connected to the right side half shaft 1000 through a spline, the driven gear 1 402 of the gear transmission mechanism 1 is connected to the outer ring of the driving plate 1 403 of the one-way clutch 1 through a spline, and the driven plate 1 404 of the one-way clutch 1 is connected to the intermediate shaft 700 through a spline. The driving gear 2 601 of the gear transmission mechanism 2 is connected to the left half shaft 800 through a spline, the driven gear 2 602 of the gear transmission mechanism 2 is connected to the outer ring of the driving plate 2 603 of the one-way clutch 2 through a spline, and the driven plate 2 604 of the gear transmission mechanism 2 is connected to the intermediate shaft 700 through a spline. The driving reduction gear 501 of the main reduction cylindrical gear device 500 is connected to the intermediate shaft 700 through a spline, and the driven reduction gear 502 of the main reduction cylindrical gear device 500 is connected to the housing of the open differential 900.

[0039] like Figure 2 As shown, the transmission ratio of the gear transmission mechanism 1 of the right limited slip differential device 400 is The transmission ratio of the gear transmission mechanism 2 of the left limited slip differential device 600 is Exactly the same, the transmission ratio of gear transmission mechanism 1 and the transmission ratio of the gear transmission mechanism 2 Less than the transmission ratio of the main reduction cylindrical gear unit 500 .in, is the ratio of the number of teeth of the driven reduction gear 501 of the main reduction cylindrical gear device 500 to the number of teeth of the driving reduction gear 502 of the main reduction cylindrical gear device 500, is the ratio of the number of teeth of the driving gear 1 401 of the gear transmission mechanism 1 to the number of teeth of the driven gear 1 402 of the gear transmission mechanism 1, It is the ratio of the number of teeth of the driving gear 2 601 of the gear transmission mechanism 2 to the number of teeth of the driven gear 2 602 of the gear transmission mechanism 2.

[0040] like Figure 2As shown, when the speed of the active plate 1 403 of the one-way clutch 1 is greater than the speed of the driven plate 1 404 of the one-way clutch 1, the one-way clutch 1 is engaged, and the limited slip differential electric drive axle based on the one-way clutch can realize the limited slip function of the right half shaft; when the speed of the active plate 1 403 of the one-way clutch 1 is less than the speed of the driven plate 2 604 of the one-way clutch 1, the one-way clutch 1 is disengaged, and the limited slip differential electric drive axle based on the one-way clutch can realize the inter-wheel differential function. When the speed of the active plate 2 603 of the one-way clutch 2 is greater than the speed of the driven plate 2 604 of the one-way clutch 2, the one-way clutch 2 is engaged, and the limited slip differential electric drive axle based on the one-way clutch can realize the limited slip function of the left half shaft; when the speed of the active plate 2 603 of the one-way clutch 2 is less than the speed of the driven plate 2 604 of the one-way clutch 2, the one-way clutch 2 is disengaged, and the limited slip differential electric drive axle based on the one-way clutch can realize the inter-wheel differential function.

[0041] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A limited slip differential electric drive axle based on a one-way clutch, characterized in that: include: The drive axle housing supports other components; The driving motor is an inner rotor motor, comprising: a motor housing, a stator coil, a rotor, and a power output shaft; The planetary gear reduction mechanism includes: a sun gear, a planetary gear, a planetary carrier, and a ring gear; The right limited slip differential device comprises: a gear transmission mechanism 1, a one-way clutch 1; The left-side limited slip differential device comprises: a second gear transmission mechanism and a second one-way clutch; The main reduction cylindrical gear device comprises: a driving reduction gear and a driven reduction gear; Intermediate shaft; open differential; Left half shaft; Right half shaft.

2. The limited slip differential electric drive axle based on a one-way clutch as claimed in claim 1, characterized in that: The power output shaft of the drive motor is connected to the sun gear of the planetary gear reduction mechanism through a spline, the planetary carrier of the planetary gear reduction mechanism is fixedly connected to the drive axle housing, the ring gear of the planetary gear reduction mechanism is connected to the right end of the intermediate shaft through a spline, and the left end of the intermediate shaft is supported by a bearing and connected to the drive axle housing.

3. The limited slip differential electric drive axle based on a one-way clutch as claimed in claim 1, characterized in that: The gear transmission mechanism 1 of the right limited slip differential device includes: a driving gear 1 and a driven gear 1, and the one-way clutch 1 of the right limited slip differential device includes: a driving plate 1 and a driven plate 1; The driving gear 1 is connected to the right half shaft through a spline, the driven gear 1 is connected to the outer ring of the driving plate 1 through a spline, and the driven plate 1 is connected to the intermediate shaft through a spline.

4. The limited slip differential electric drive axle based on a one-way clutch as claimed in claim 1, characterized in that: The gear transmission mechanism 2 of the left limited slip differential device comprises: a second driving gear and a second driven gear, and the one-way clutch 2 of the left limited slip differential device comprises: a second driving plate and a second driven plate; The second driving gear is connected to the left half shaft via a spline, the second driven gear is connected to the outer ring of the second driving plate via a spline, and the second driven plate is connected to the intermediate shaft via a spline.

5. The limited slip differential electric drive axle based on a one-way clutch as claimed in claim 1, characterized in that: The driving reduction gear of the main reduction cylindrical gear device is connected to the intermediate shaft through a spline, and the driven reduction gear of the main reduction cylindrical gear device is connected to the housing of the open differential.

6. The limited slip differential electric drive axle based on a one-way clutch as claimed in claim 1, characterized in that: The transmission ratio of the gear transmission mechanism 1 of the right limited slip differential device is The transmission ratio of the gear transmission mechanism 2 of the left limited slip differential device is The transmission ratio of the gear transmission mechanism 1 is exactly the same as and the transmission ratio of the gear transmission mechanism 2 Less than the transmission ratio of the main reduction cylindrical gear device ; in, is the ratio of the number of teeth of the driven reduction gear of the main reduction cylindrical gear device to the number of teeth of the driving reduction gear of the main reduction cylindrical gear device, is the ratio of the number of teeth of the driving gear 1 of the gear transmission mechanism 1 to the number of teeth of the driven gear 1 of the gear transmission mechanism 1, It is the ratio of the number of teeth of the second driving gear of the second gear transmission mechanism to the number of teeth of the second driven gear of the second gear transmission mechanism.

7. The limited slip differential electric drive axle based on a one-way clutch as claimed in claim 3, characterized in that: When the rotation speed of the active plate 1 of the one-way clutch 1 is greater than the rotation speed of the driven plate 1 of the one-way clutch 1, the one-way clutch 1 is engaged, and at this time, the one-way clutch-based limited slip differential electric drive axle can realize the limited slip function of the right half shaft; When the rotation speed of the active plate 1 of the one-way clutch 1 is less than the rotation speed of the driven plate 1 of the one-way clutch 1, the one-way clutch 1 is disengaged. At this time, the one-way clutch-based limited slip differential electric drive axle realizes the inter-wheel differential function.

8. The limited slip differential electric drive axle based on a one-way clutch as claimed in claim 4, characterized in that: When the rotation speed of the active plate 2 of the one-way clutch 2 is greater than the rotation speed of the driven plate 2 of the one-way clutch 2, the one-way clutch 2 is engaged, and at this time, the one-way clutch-based limited slip differential electric drive axle can realize the limited slip function of the left half shaft; When the rotation speed of the active plate 2 of the one-way clutch 2 is less than the rotation speed of the driven plate 2 of the one-way clutch 2, the one-way clutch 2 is disengaged. At this time, the one-way clutch-based limited slip differential electric drive axle realizes the inter-wheel differential function.

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