WO2022135101A1

WO2022135101A1 - Transfer case device and vehicle

Info

Publication number: WO2022135101A1
Application number: PCT/CN2021/135012
Authority: WO
Inventors: 白秀超; 徐占; 王志明; 赵雪松; 兰晨; 刘君祺; 樊雪来; 赵成福; 李鸿波
Original assignee: 中国第一汽车股份有限公司
Priority date: 2020-12-25
Filing date: 2021-12-02
Publication date: 2022-06-30
Also published as: CN112762144B; CN112762144A

Abstract

A transfer case device and a vehicle, the transfer case device comprising an input shaft assembly (1), a first connecting shaft assembly (2), an intermediate shaft assembly (3), a second connecting shaft assembly (4), an output shaft assembly (5) and a clutch, which are sequentially in transmission connection by means of gears. An input end of the input shaft assembly (1) is configured to be connected to an output shaft of a transmission, a backward output end of the input shaft assembly (1) is configured to be connected to a rear drive axle, and a forward output end of the output shaft assembly (5) is configured to be connected to a front drive axle; and the clutch is arranged in the intermediate shaft assembly (3), and the diameters of gears in the intermediate shaft assembly (3) are smaller than the diameters of gears in the other shaft assemblies. By means of speed ratio adjustment, requirements for the torque capacity of the clutch are lowered, the number of clutch plates and the size of the clutch are reduced, and the drag torque of the clutch is reduced accordingly. Therefore, the difficulties in arranging a transfer case on a vehicle and the manufacturing costs of the transfer case are reduced, and electric motor model selection is facilitated.

Description

Transfer unit and vehicle

This application claims the priority of the Chinese Patent Application No. 202011566340.2 filed with the China Patent Office on December 25, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of transfer case technology, for example, to a transfer case device and a vehicle.

Background technique

In order to realize the four-wheel drive function of internal combustion engine vehicles, a transfer case will be arranged in the transmission system. Depending on the arrangement of the engine, the transfer case is divided into a vertical transfer case and a transverse transfer case. The power output by the engine is transmitted to the transfer case through the transmission, and the transfer case then transmits the power to the front axle and the rear axle. In the two-wheel drive mode, the power is directly transmitted to the rear axle. The maximum transmission torque of the axle depends on the clutch torque capacity.

The clutch of the vertical vehicle transfer case is usually arranged on the input shaft of the transfer case, and the torque limit output by the transfer case to the front axle is the clutch capacity. High, the number of clutch plates and the effective diameter of the clutch continue to increase, and the required torque capacity of the motor is also increased, resulting in an increase in the volume of the clutch. The upper layout is difficult, and the manufacturing difficulty and cost are also increased, and at the same time, it also causes many difficulties in performing motor selection.

SUMMARY OF THE INVENTION

The present application provides a transfer case device and a vehicle, which lowers the requirements on the torque capacity of the clutch, reduces the difficulty in arranging the transfer case and the manufacturing cost on the whole vehicle, and is beneficial to the selection of the motor type.

The application adopts the following technical solutions: a transfer device, comprising an input shaft assembly, a first connecting shaft assembly, an intermediate shaft assembly, a second connecting shaft assembly, an output shaft assembly and Clutch, the input end of the input shaft assembly is set to be connected with the output shaft of the transmission, the rearward output end of the input shaft assembly is set to be connected to the rear drive axle; the forward output end of the output shaft assembly The clutch is arranged in the intermediate shaft assembly, the diameter of the gear in the intermediate shaft assembly is smaller than that of the input shaft assembly, the first connecting shaft assembly, the The diameter of the gear in the second connecting shaft assembly and the output shaft assembly.

As an optional technical solution of the above-mentioned transfer case, the input shaft assembly includes an input shaft and an input gear arranged on the input shaft, and the input end of the input shaft is arranged to be connected with the output of the transmission. shaft connection, the rearward output end of the input shaft is configured to be connected with the rear drive axle; the first connecting shaft assembly includes a connecting shaft and a first transmission gear arranged on the connecting shaft, so the first transmission gear meshes with the input gear; the intermediate shaft assembly includes an intermediate shaft, a driving gear and a driven gear arranged on the intermediate shaft, the clutch is arranged on the intermediate shaft, the The driving gear meshes with the first transmission gear, and the driven gear can transmit the pressing force of the clutch to the driving gear; the second connecting shaft assembly includes a connecting shaft and a connecting shaft arranged on the connecting shaft The second transmission gear is meshed with the driven gear; the output shaft assembly includes an output shaft and an output gear arranged on the output shaft, the output gear and the first Two transmission gears are engaged, and the forward output end of the output shaft is arranged to be connected with the front drive axle.

As an optional technical solution of the above-mentioned transfer case, the intermediate shaft assembly further includes a ball cam assembly disposed on the intermediate shaft, including an outer ball cam and an inner ball cam;

The transfer device further includes a motor actuator and a motor drive gear, the motor actuator is configured to be drivingly connected to the motor drive gear to drive the motor drive gear to rotate, and the motor drive gear is configured to drive the motor drive gear. The outer ball cam and the inner ball cam rotate relative to each other.

As an optional technical solution of the above-mentioned transfer device, the transfer device further includes: a double-coupling wheel, the first side of the motor drive gear is meshed with the inner ball cam, and the second side of the motor drive gear is engaged with the inner ball cam. The side meshes with the input side of the duplex wheel, and the output side of the duplex wheel meshes with the outer ball cam.

As an optional technical solution of the above-mentioned transfer device, the double-coupling wheel includes: an outer wheel and an inner wheel that are coaxially connected, the inner wheel is meshed with the motor drive gear, and the outer wheel and the outer ball Cam engagement.

As an optional technical solution of the above-mentioned transfer case, the clutch includes: an outer clutch hub, which is fixedly connected with the driven gear, and an inner clutch hub, which is fixedly connected with the intermediate shaft, and the inner clutch hub can be relatively The clutch outer hub rotates.

As an optional technical solution of the above-mentioned transfer case, the clutch further includes: a friction plate fixed between the outer clutch hub and the inner clutch hub; the intermediate shaft assembly further includes a friction plate arranged in the middle An oil on-off assembly on the shaft, the oil on-off assembly is located inside the clutch inner hub, the oil on-off assembly is configured to allow oil to flow to the friction plate in a four-wheel drive mode.

As an optional technical solution of the above-mentioned transfer case, the oil on-off assembly includes: an outer oil distribution sleeve and an inner oil distribution sleeve, and the outer oil distribution sleeve is circumferentially provided with an outer sleeve. An oil port, the inner oil distribution sleeve is provided with an inner oil port along the circumferential direction, and the clutch inner hub 321 is provided with an inner hub oil inlet hole along the circumferential direction; in the two-drive mode, the outer The oil-passing port and the inner oil-passing port are staggered from each other, which is a closed state; in the four-wheel drive mode, the outer oil-passing port and the inner oil-passing port are changed from being staggered to gradually overlapping, which is an open state. The oil can flow to the friction plate through the inner hub oil inlet hole.

As a preferred technical solution of the above-mentioned transfer case, the clutch further comprises: a pressure plate, a return spring, a pressure plate limit cylinder and a spring seat, and the return spring and the spring seat are installed on the pressure plate and the spring seat. Between the pressure plate limit cylinders, the pressure plate rotates synchronously with the pressure plate limit cylinder, and the pressure plate limit cylinder rotates synchronously with the clutch inner hub.

A vehicle includes the transfer case device according to any one of the above technical solutions.

Description of drawings

1 is a schematic structural diagram of a transfer device provided by a specific embodiment of the present application;

2 is a cross-sectional view of a transfer case provided by a specific embodiment of the present application;

3 is a sectional view of a transfer case provided by a specific embodiment of the present application;

4 is a schematic diagram 1 of the working principle of the oil on-off assembly provided by the specific embodiment of the present application;

FIG. 5 is a schematic diagram 2 of the working principle of the oil on-off assembly provided by the specific embodiment of the present application;

6 is a schematic structural diagram of an outer oil distribution sleeve provided by a specific embodiment of the present application;

7 is a schematic structural diagram of an oil distribution sleeve provided by a specific embodiment of the present application;

FIG. 8 is a schematic diagram of the working principle of the ball cam assembly provided by the specific embodiment of the present application.

In the picture:

1-input shaft assembly; 101-input shaft; 101a-input end; 101b-backward output end; 102-input shaft front bearing; 103-input shaft rear bearing;

2- first connecting shaft assembly; 201- connecting shaft; 202- connecting shaft front bearing; 203- connecting shaft rear bearing;

3-intermediate shaft assembly; 301-nut; 302-intermediate shaft rear bearing; 303-thrust plate; 304-first thrust bearing; 305-outside ball cam; 306-steel ball; 307-inside ball cam; 308- The second thrust bearing; 309 - oil distribution sleeve; 309a - second rotation protrusion; 309b - internal liquid hole; 309c - internal oil port; 310 - oil outer distribution sleeve; 310b-external fluid hole; 310c-external oil port; 311-pressure plate; 311a-first limit groove; 312-return spring; 313-pressure plate limit cylinder; 313a-first claw; 313b -Pressure plate limit cylinder opening; 313c-Second claw; 314-Spring seat; 315-Partition plate; 316-Clutch inner hub push plate; 317-Friction plate; 318-Steel plate; 319-Clutch outer hub push plate ; 320 - clutch outer hub; 321 - clutch inner hub; 321a - inner hub oil inlet; 321b - second limit groove; 322 - bushing; 323 - driven gear; 324 - needle bearing; 325 - third Thrust bearing; 326-intermediate shaft front bearing; 327-intermediate shaft; 327a-first fluid hole; 327b-second fluid hole; 327c-third fluid hole; 327d-oil inlet;

4-Second connecting shaft assembly; 401-Connecting shaft; 402-Connecting shaft front bearing; 403-Connecting shaft rear bearing;

5-output shaft assembly; 501-output shaft; 501a-forward output end; 502-output shaft front bearing; 503-output shaft rear bearing;

6- Motor actuator;

7- Motor drive gear;

8-double wheel; 801-outer wheel; 802-inner wheel.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of this application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or The positional relationship is based on the orientation or positional relationship shown in the attached drawings, or the orientation or positional relationship that the product of the application is usually placed in use. It is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the device referred to. Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance. In the description of this application, unless stated otherwise, "plurality" means two or more.

In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or Integrally connected; either mechanical or electrical. For those of ordinary skill in the art, the meanings of the above terms in the present application can be understood according to the situation.

In this application, unless otherwise expressly specified and defined, a first feature "on" or "under" a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

Embodiments of the present application are described below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but should not be construed as a limitation on the present application.

As shown in FIG. 1 to FIG. 8 , the present embodiment provides a transfer case device for a longitudinally mounted vehicle, which adopts a five-axis arrangement structure of gear transmission. As shown in FIG. 1 , the transfer case device includes sequential transmission through gears. The connected input shaft assembly 1, the first connecting shaft assembly 2, the intermediate shaft assembly 3, the second connecting shaft assembly 4 and the output shaft assembly 5, in addition to the motor actuator 6, the motor driving gear 7 and the double Coupling 8. The clutch is arranged in the intermediate shaft assembly 3, the diameter of the gear in the intermediate shaft assembly 3 is smaller than the gears in the input shaft assembly 1, the first connecting shaft assembly 2, the second connecting shaft assembly 4 and the output shaft assembly 5 diameter. Through the adjustment of the speed ratio, the requirements for the torque capacity of the clutch are reduced, the number and size of the clutches are reduced, and the drag torque is also reduced, which reduces the difficulty and manufacturing cost of the transfer case on the vehicle, which is conducive to the selection of the motor.

As shown in FIG. 2, the input shaft assembly 1 includes an input shaft 101, a front bearing 102 of the input shaft and a rear bearing 103 of the input shaft. The input shaft 101 is provided with an input gear. The input shaft 101 and the input gear can be optionally formed in one piece. The input end 101a of the 101 is configured to be connected to the output shaft of the transmission, and the rearward output end 101b of the input shaft 101 is configured to be connected to the rear drive axle. The first connecting shaft assembly 2 includes a connecting shaft 201, a front bearing 202 of the connecting shaft and a rear bearing 203 of the connecting shaft. The connecting shaft 201 is provided with a first transmission gear. The connecting shaft 201 and the first transmission gear are optionally integrally formed. The transmission gear meshes with the input gear. The intermediate shaft assembly 3 includes the intermediate shaft 327, the intermediate shaft front bearing 326 and the intermediate shaft rear bearing 302. The intermediate shaft 327 is provided with a driving gear and a driven gear 323. The intermediate shaft 327 and the driving gear are optionally integrally formed, and the clutch is arranged at the On the intermediate shaft 327, the driving gear meshes with the first transmission gear, and the driven gear 323 can transmit the pressing force of the clutch to the driving gear. The second connecting shaft assembly 4 includes a connecting shaft 401 , a connecting shaft front bearing 402 and a connecting shaft rear bearing 403 . The connecting shaft 401 is provided with a second transmission gear, the connection shaft 401 and the second transmission gear are optionally formed integrally, and the second transmission gear meshes with the driven gear 323 . The output shaft assembly 5 includes an output shaft 501, a front bearing 502 of the output shaft and a rear bearing 503 of the output shaft. The output shaft 501 is provided with an output gear, the output gear meshes with the second transmission gear, and the forward output end 501a of the output shaft 501 is provided For connection to the front drive axle.

The intermediate shaft assembly 3 also includes a ball cam assembly and an oil on-off assembly, and all components are supported by the intermediate shaft 327 .

The power output by the engine is transmitted to the transfer case through the transmission, and the transfer case then transmits the power to the front axle and the rear axle. In the two-wheel drive mode, the power is directly transmitted to the rear axle; in the four-wheel drive mode, the power is transmitted to the input shaft 101. , Connect the shaft 201 to the driving gear of the intermediate shaft 327 . The electronic control system controls the motor actuator to rotate, drives the ball cam assembly to rotate, and finally presses the clutch. After the clutch is pressed, the power can pass through the driven wheel 323, the connecting shaft 401 and the output shaft 501, and finally transmit to the front axle. The transmitted torque depends on the clutch torque capacity. The transition time from the two-wheel drive mode to the four-wheel drive mode should be shortened as much as possible to improve the vehicle's response speed to complex road surfaces and improve driving safety. As a part of the transmission, the transfer case is a power distribution unit, and it has a certain efficiency loss. Its efficiency should be improved as much as possible, especially the drag torque of the clutch should be reduced in the two-drive condition, that is, in the two-drive condition. , When the clutch is not working, the oil supply to the clutch can be stopped. It should be considered that the oil on-off component should not affect the normal structure and life of the clutch friction plate.

The ball cam assembly of the force-increasing mechanism of the transfer case is composed of two ball cams and a plurality of steel balls. The end face of each ball cam has a plurality of spiral grooves, and the rotation of the ball cam can be moved through the spiral groove surface and the steel ball. Converted into the axial movement of the ball cam to achieve force amplification in order to compress the clutch, the ball cam assembly is the force amplification element between the motor actuator and the clutch. The ball cam assembly is usually fixed for one ball cam, and the other ball cam is driven by the turbine worm or the reduction gear. With the increasing demand for the response of the transfer case, the structural limitations of this control cam are obvious.

In order to improve the response speed of the transfer case, the ball cam assembly in this embodiment includes an outer ball cam 305, a steel ball 306 and an inner ball cam 307. The motor actuator 6 is drivingly connected to the motor drive gear 7 to drive the motor drive gear 7 to rotate. , the motor drive gear 7 can drive the outer ball cam 305 and the inner ball cam 307 to rotate relative to each other.

As shown in FIG. 8 , the double wheel 8 includes an outer wheel 801 and an inner wheel 802 that are coaxially connected. The first side of the motor drive gear 7 meshes with the inner ball cam 307 , the second side meshes with the inner wheel 802 , and the outer wheel 801 Engage with the outer ball cam 305 . Under this structure, the motor actuator 6 works, the motor drive gear 7 rotates accordingly, and drives the inner ball cam 307 to rotate; the motor drive gear 7 simultaneously drives the inner wheel 802 and the outer wheel 801 to rotate, and finally drives the outer ball cam 305 to rotate, In order to make the inner ball cam 307 and the outer ball cam 305 rotate relative to each other. In this embodiment, the double-coupling wheel 8 is connected to the motor actuator 6, and the motor actuator 6 drives the inner ball cam 307 and the outer ball cam 305 to rotate in opposite directions at the same time, which shortens the response time of the transfer case by half.

The outer ball cam 305 , the steel ball 306 and the inner ball cam 307 are restricted by the thrust plate 303 and the first thrust bearing 304 in the radial direction so as not to come out, and the inner ball cam 307 is press-fitted with the second thrust bearing 308 .

In this embodiment, the clutch includes an outer clutch hub 320 and an inner clutch hub 321, the outer clutch hub 320 is fixedly connected with the driven gear 323, the inner clutch hub 321 is fixedly connected with the intermediate shaft 327, and the inner clutch hub 321 can be relative to the outer clutch hub 321. The hub 320 rotates.

In order to reduce the drag torque of the clutch in the two-drive mode, the traditional transfer case adopts on-off control for the amount of lubricating oil of the clutch, and there are large holes in the clutch friction plate, so that the lubricating mechanism can penetrate into it, and the inner diameter of the clutch friction plate is The direct connection with the input shaft makes the inner diameter and outer diameter of the clutch friction plate very different. When transmitting a large torque, the clutch friction plate is easily warped and deformed, and the long-term service life will be reduced.

Friction plates 317 and steel plates 318 are alternately arranged between the clutch outer hub 320 and the clutch inner hub 321. The oil on-off component is located inside the clutch inner hub 321. The clutch inner hub 321 is provided with a plurality of inner hub oil inlets along the circumferential direction. The hole 321a can receive lubricating oil from the oil on-off device in the four-wheel drive mode. This arrangement reduces the warpage of the friction plate 317 and increases the service life of the friction plate 317 . In addition, all bearings have fluid holes for better lubrication.

The oil on-off assembly includes an outer oil distribution sleeve 310 and an inner oil distribution sleeve 309. The outer oil distribution sleeve 310 rotates with the inner ball cam 307, and the oil inner distribution sleeve 309 rotates with the outer ball cam 305. turn. 6 and 7, the outer oil distribution sleeve 310 is provided with an outer oil port 310c in the circumferential direction, and the inner oil distribution sleeve 309 is provided with an inner oil port 309c in the circumferential direction, optionally , the outer oil port 310c and the inner oil port 309c are provided with a plurality of, and the number is equal. Optionally, the outer circumference of the outer oil distribution sleeve 310 is provided with a plurality of first rotating protrusions 310a, the inner side wall of the inner ball cam 307 is provided with a plurality of first rotating grooves, and a plurality of first rotating protrusions. The lifts 310a are snapped into the plurality of first rotating grooves in a one-to-one correspondence, so that the inner ball cam 307 drives the outer oil distribution sleeve 310 to rotate synchronously. The outer circumference of the inner oil distribution sleeve 309 is provided with a plurality of second rotating protrusions 309a, the inner side wall of the outer ball cam 305 is provided with a plurality of second rotating grooves, and the plurality of second rotating protrusions 309a are provided one by one. Correspondingly clamped in the plurality of second rotating grooves, so that the outer ball cam 305 drives the inner oil distribution sleeve 309 to rotate synchronously.

As shown in FIGS. 3 to 7 , in the two-drive mode, the outer oil port 310c and the inner oil port 309c are staggered and closed, and the oil introduced from the oil inlet 327d passes through the first port on the intermediate shaft 327. After a fluid hole 327a cannot flow to the clutch. In the four-wheel drive mode, when the motor actuator 6 receives the command of the whole vehicle to rotate, the outer oil distribution sleeve 310 and the inner oil distribution sleeve 309 will rotate with each other, and the outer oil port 310c and the inner oil port 309c are connected by They are staggered and gradually overlapped, and are in an open state, that is, the oil can flow to the clutch inner hub 321 through the outer oil port 310c, the inner oil port 309c and the pressure plate limit cylinder opening 313b, and finally pass through the inner hub oil inlet hole 321a , flows to the friction plate 317.

The overlapping size of the outer oil port 310c and the inner oil port 309c varies with the rotation angle of the motor actuator 6, that is, when the clutch transmits a large torque, the amount of lubricating oil in the clutch also increases, and when the clutch transmits torque is small, the clutch The amount of lubricating oil will become smaller, and there is no clutch lubricating oil in two-wheel drive mode.

Optionally, a partition plate 315 is installed in the oil distribution sleeve 309, the partition plate 315 is annular, and the inner ring of the partition plate 315 is in contact with the intermediate shaft 327, so as to limit the spray from the first liquid hole 327a on the intermediate shaft 327. The oil can only flow to the oil on-off device, preventing the oil from flowing around.

The clutch also includes a pressure plate 311, a return spring 312, a pressure plate limit cylinder 313 and a spring seat 314. The return spring 312 and the spring seat 314 are installed between the pressure plate 311 and the pressure plate limit cylinder 313. The pressure plate limiting cylinder 313 rotates synchronously, and the pressure plate limiting cylinder 313 rotates synchronously with the clutch inner hub 321 .

The pressure plate limiting cylinder 313 is provided with a first convex claw 313a, the pressure plate 311 is provided with a first limiting groove 311a, and the first convex claw 313a extends into and is clamped in the first limiting groove 311a. , the pressure plate limiting cylinder 313 will limit the axial movement of the pressure plate 311 and enable the pressure plate 311 to rotate with the pressure plate limiting cylinder 313 . The pressure plate limiting cylinder 313 is provided with a second convex claw 313c, the clutch inner hub 321 is provided with a second limiting groove 321b, the second convex claw 313c extends into and is clamped in the second limiting groove 321b, this structure Then, the inner clutch hub 321 can drive the pressure plate limiting cylinder 313 to rotate, and limit the axial movement of the pressure plate limiting cylinder 313 .

Since there is relative rotation between the intermediate shaft 327 and the clutch inner hub 321, the driven gear 323 and the clutch outer hub 320, a needle bearing 324 is installed between the intermediate shaft 327 and the driven gear 323, and the driving gear and the driven gear A third thrust bearing 325 is installed between 323 . When the clutch is pressed and the torque is transmitted to the front axle, the needle bearing 324 and the third thrust bearing 325 will be subjected to a relatively large force. Therefore, between the clutch inner hub 321 and the clutch outer hub 320, there is an auxiliary support. The bushing 322 prevents the clutch outer hub 320 from deflecting when the clutch is not pressed in two-wheel drive conditions.

Optionally, the intermediate shaft 327 is also provided with a second fluid hole 327b, and a part of the oil is formed by the inner fluid hole 309b opened on the inner oil distribution sleeve 309 and the outer fluid hole 310b opened on the outer oil distribution sleeve 310. Flowing to the second thrust bearing 308 , another part of the oil flows to the first thrust bearing 304 . Optionally, the intermediate shaft 327 is further provided with a third liquid hole 327c for lubricating the bushing 322 , the needle bearing 324 and the third thrust bearing 325 .

The working principle of the transfer device in this embodiment will be briefly described below.

Referring to Figures 3 to 8, in the two-drive mode, the motor actuator 6 does not act. Under certain road conditions, the vehicle control module sends a four-drive signal, the motor actuator 6 starts to act, and the motor drive gear 7 follows. The rotation drives the inner ball cam 307 to rotate; the motor drive gear 7 simultaneously drives the inner wheel 802 and the outer wheel 801 to rotate, and finally drives the outer ball cam 305 to rotate, and the inner ball cam 307 and the outer ball cam 305 rotate oppositely. Under the action of the internal helical groove of the ball cam assembly, the axial distance between the inner ball cam 307 and the outer ball cam 305 increases, pushing the pressure plate 311 to press the clutch inner hub push plate 316, and the friction plate 317 and the steel plate 318 press The pressing force is finally transmitted to the driving gear of the intermediate shaft 327 through the clutch outer hub push plate 319, the clutch outer hub 320, the driven gear 323 and the third thrust bearing 325; on the other side of the ball cam assembly, the pressing force is The force passes through the first thrust bearing 304 , the thrust plate 303 , the intermediate rear bearing 302 , and the nut 301 , and is finally transmitted to the intermediate shaft 327 , and the clutch pressing force realizes a closed loop on the intermediate shaft assembly 3 .

The transfer case in this embodiment adopts a five-shaft arrangement structure of gear transmission, the clutch is arranged in the intermediate shaft assembly 3, and the gear diameter in the intermediate shaft assembly 3 is larger than that of the input shaft assembly 1, and the first connecting shaft assembly In 2, the diameter of the gears in the second connecting shaft assembly 4 and the output shaft assembly 5 is small, which reduces the torque capacity of the clutch. The layout difficulty and manufacturing cost on the upper part are beneficial to the selection of the motor type; the double wheel 8 is connected to the motor actuator 6, and the motor actuator 6 drives the inner ball cam 307 and the outer ball cam 305 to rotate in opposite directions at the same time, which improves the performance of the motor. The response speed of the clutch shortens the response time of the transfer case; the oil on-off component of the clutch lubricating oil is arranged in the clutch inner hub 321, the friction plate 317 of the clutch is fixed on the outer side of the clutch inner hub 321, and the friction plate 317 The ratio of the outer diameter to the inner diameter is greatly reduced, thereby reducing the warpage of the friction plate 317 and increasing the service life of the friction plate 317 .

This embodiment also provides a vehicle including the above-mentioned transfer case.

Claims

A transfer device, comprising an input shaft assembly (1), a first connecting shaft assembly (2), an intermediate shaft assembly (3), a second connecting shaft assembly (4), a first connecting shaft assembly (2), a second connecting shaft assembly (4), An output shaft assembly (5) and a clutch, the input end (101a) of the input shaft assembly (1) is configured to be connected with the output shaft of the transmission, and the rearward output end (101b) of the input shaft assembly (1) ) is arranged to be connected to the rear drive axle; the forward output end (501a) of the output shaft assembly (5) is arranged to be connected to the front drive axle; the clutch is arranged in the intermediate shaft assembly (3), The diameter of the gear in the intermediate shaft assembly (3) is smaller than that of the input shaft assembly (1), the first connecting shaft assembly (2), the second connecting shaft assembly (4) and the Gear diameter in output shaft assembly (5).
The transfer case device of claim 1, wherein:

The input shaft assembly (1) includes an input shaft (101) and an input gear arranged on the input shaft (101), and the input end (101a) of the input shaft (101) is arranged to be connected with the input gear (101a) of the input shaft (101). The output shaft of the transmission is connected, and the rearward output end (101b) of the input shaft (101) is arranged to be connected with the rear drive axle;

The first connecting shaft assembly (2) includes a connecting shaft (201) and a first transmission gear arranged on the connecting shaft (201), the first transmission gear meshing with the input gear;

The intermediate shaft assembly (3) includes an intermediate shaft (327), a driving gear and a driven gear (323) arranged on the intermediate shaft (327), and the clutch is arranged on the intermediate shaft (327) , the driving gear meshes with the first transmission gear, and the driven gear (323) can transmit the pressing force of the clutch to the driving gear;

The second connecting shaft assembly (4) includes a connecting shaft (401) and a second transmission gear arranged on the connecting shaft (401), the second transmission gear meshing with the driven gear (323) ;

The output shaft assembly (5) includes an output shaft (501) and an output gear arranged on the output shaft (501), the output gear meshes with the second transmission gear, and the output shaft (501) The forward output terminal (501a) of the device is arranged to be connected with the front drive axle.
The transfer case device according to claim 2, wherein the intermediate shaft assembly (3) further comprises:

a ball cam assembly, including an outer ball cam (305) and an inner ball cam (307);

The transfer device further comprises a motor actuator (6) and a motor drive gear (7), the motor actuator (6) being configured to be drivingly connected to the motor drive gear (7) to drive the motor drive gear (7) Rotation, the motor driving gear (7) is configured to be able to drive the outer ball cam (305) and the inner ball cam (307) to rotate in opposite directions.
The transfer case device of claim 3, further comprising:

Double gear (8), the first side of the motor drive gear (7) meshes with the inner ball cam (307), and the second side of the motor drive gear (7) is engaged with the double gear (8) ) is engaged with the input side, and the output side of the double gear (8) is engaged with the outer ball cam (305).
The transfer case device according to claim 4, wherein the double wheel (8) comprises:

Coaxially connected outer wheel (801) and inner wheel (802), the inner wheel (802) meshes with the motor drive gear (7), the outer wheel (801) and the outer ball cam (305) mesh.
The transfer case assembly of claim 2, wherein the clutch comprises:

The clutch outer hub (320) is fixedly connected with the driven gear (323),

The inner clutch hub (321) is fixedly connected with the intermediate shaft (327), and the inner clutch hub (321) can rotate relative to the outer clutch hub (320).
The transfer case assembly of claim 6, wherein the clutch further comprises:

a friction plate (317) fixed between the clutch outer hub (320) and the clutch inner hub (321);

The intermediate shaft assembly (3) further includes an oil on-off assembly arranged on the intermediate shaft (327), the oil on-off assembly is located inside the clutch inner hub (321), the oil A fluid on-off assembly is configured to allow fluid to flow to the friction plates (317) in four-wheel drive mode.
The transfer case of claim 7, wherein the oil on-off assembly comprises:

An outer oil distribution sleeve (310) and an inner oil distribution sleeve (309), the outer oil distribution sleeve (310) is provided with an external oil port (310c) in the circumferential direction, and the oil inside The distribution sleeve (309) is provided with an inner oil inlet (309c) along the circumferential direction, and the clutch inner hub (321) is provided with an inner hub oil inlet hole (321a) along the circumferential direction;

In the two-wheel drive mode, the outer oil port (310c) and the inner oil port (309c) are staggered from each other and are in a closed state; in the four-wheel drive mode, the outer oil port (310c) and the The inner oil ports (309c) are changed from being staggered to gradually overlapping, and are in an open state, and the oil can flow to the friction plate (317) through the inner hub oil inlet hole (321a).
The transfer case assembly of claim 1, wherein the clutch further comprises:

A pressure plate (311), a return spring (312), a pressure plate limit cylinder (313) and a spring seat (314), the return spring (312) and the spring seat (314) are mounted on the pressure plate Between (311) and the pressure plate limiting cylinder (313), the pressure plate (311) rotates synchronously with the pressure plate limiting cylinder (313), and the pressure plate limiting cylinder (313) follows any The clutch inner hub (321) rotates synchronously.
A vehicle comprising the transfer case device of any one of claims 1-9.