Intelligent four-wheel drive transfer case

Abstract

The invention relates to an intelligent four-wheel-drive transfer case, and belongs to the technical field of automobile transfer case equipment. According to the technical scheme, the gear shifting device comprises a planetary gear mechanism, a rear output shaft (1), a front output shaft (8), a high-low gear sleeve (2) arranged on the rear output shaft (1), an oil pump (3), a four-wheel-drive locking mechanism, a clutch mechanism, a driven chain wheel (7) arranged on the front output shaft (8), a gear shifting control mechanism parallel to an input shaft, and an electromagnetic coil (4) arranged on a shell. And the driven chain wheel (7) on the front output shaft (8) is in transmission connection with the driving chain wheel (22) on the rear output shaft (1) through a transmission chain (9). The four-wheel drive system has the advantages that active distribution of power of the front axle and the rear axle is achieved through the clutch, intelligence of the four-wheel drive system is achieved, and automatic distribution of power on ice, snow and slippery road surfaces is achieved. Mechanical locking of the front axle and the rear axle can be achieved, the passing performance under the extreme cross-country working condition is guaranteed, and the defect of the heat capacity of a clutch is overcome.

Description

Technical Field

[0001] The present invention relates to an intelligent four-wheel drive transfer case, belonging to the technical field of automobile transfer case equipment. Background Art

[0002] With the increasing automation of vehicles in recent years, the demand for transfer cases with electronically controlled active torque distribution has also increased. Currently, electronically controlled transfer cases cannot meet the market demand for intelligent transfer case four-wheel drive systems, so there is an urgent need for an intelligent four-wheel drive transfer case that can meet the matching needs of high-performance vehicles. Summary of the Invention

[0003] The purpose of the present invention is to provide an intelligent four-wheel drive transfer case that can realize the intelligence of the four-wheel drive system and the mechanical locking of the front and rear axles, thereby solving the problems existing in the background technology.

[0004] The technical solution of the present invention is: An intelligent four-wheel drive transfer case, comprising a planetary gear mechanism, a rear output shaft, a front output shaft, a high and low gear sleeve arranged on the rear output shaft, an oil pump, a four-wheel drive locking mechanism and a clutch mechanism, a driven sprocket arranged on the front output shaft, a shift control mechanism arranged parallel to the input shaft, and an electromagnetic coil arranged on the housing; The planetary gear mechanism comprises an input shaft, a bearing, a planetary gear shaft, a planetary gear and a planetary carrier, wherein the input shaft and the planetary gear are meshed with each other through gears, the planetary gear is mounted on the planetary carrier through the planetary gear shaft, and the bearing is provided between the input shaft and the planetary carrier; The four-wheel drive locking mechanism comprises a four-wheel drive hub, a four-wheel drive sleeve, a thrust bearing and a driving sprocket. The four-wheel drive hub is connected to the rear output shaft, the four-wheel drive sleeve is slidably connected to the four-wheel drive hub, the driving sprocket is arranged on the rear output shaft, and the thrust bearing is arranged between the four-wheel drive hub and the driving sprocket. The clutch mechanism comprises a clutch inner gear hub, a clutch outer gear hub, a steel plate, a friction plate, a wave spring, a clutch pressure plate, an armature, an active ball cam plate, a steel ball and a passive ball cam plate assembly, the clutch inner gear hub is arranged on the rear output shaft, the friction plate and the clutch pressure plate are slidably connected to the clutch inner gear hub, the clutch outer gear hub is connected to the driving sprocket, the steel plate and the armature are slidably connected in the clutch outer gear hub, the active ball cam plate is connected to the rear output shaft and can slide on the rear output shaft, the steel ball is arranged between the active ball cam plate and the passive ball cam plate assembly, the passive ball cam plate assembly is arranged on the rear output shaft, and a wave spring is provided on the rear output shaft between the active ball cam plate and the clutch inner gear hub, and the wave spring is pressed on the side of the active ball cam plate; The shift control mechanism includes a shift motor, a shift shaft, a shift cam, a baffle, a four-wheel drive shift fork and a high-low shift fork. The shift motor and the baffle are respectively fixed on the shift shaft, and the four-wheel drive shift fork and the high-low shift fork are assembled on the shift cam. The driven sprocket on the front output shaft and the driving sprocket on the rear output shaft are connected through a transmission chain.

[0005] Furthermore, the driving sprocket is provided with a spline that cooperates with the four-wheel drive gear sleeve.

[0006] Furthermore, the active ball cam disc and the passive ball cam disc assembly are respectively provided with ball sockets that match the steel balls.

[0007] Furthermore, the shift cam is provided with an assembly groove that matches the four-wheel drive shift fork and the height shift fork.

[0008] An intelligent four-wheel drive transfer case transmission method adopts the intelligent four-wheel drive transfer case described above. In the intelligent four-wheel drive gear, when there is a speed difference between the front output shaft and the rear output shaft, the intelligent four-wheel drive control system controls the electromagnetic coil to be energized to generate suction, attracting the armature on the other side of the passive ball cam disc assembly, so that the armature and the passive ball cam disc assembly rotate synchronously, and the speed difference is transmitted to the active ball cam disc and the passive ball cam disc assembly splined to the rear output shaft. The steel ball moves in the ball socket with a lifting angle on the active ball cam disc and the passive ball cam disc assembly, so that the active ball cam disc moves away from the passive ball cam disc assembly, thereby squeezing the clutch pressure plate, generating friction between the group of steel plates and friction plates, reducing the speed difference between the front output shaft and the rear output shaft, and realizing four-wheel drive transmission; Under extreme off-road conditions, when the clutch cannot meet the four-wheel drive transmission requirements, the shift motor works, the shift shaft and shift cam rotate, driving the four-wheel drive fork and four-wheel drive gear sleeve to move axially, and connect with the spline on the active sprocket to realize four-wheel drive locking, which can realize mechanical locking of the front and rear axles, thereby ensuring the passing performance under extreme off-road conditions.

[0009] In the intelligent four-wheel drive gear, after the speed difference between the current output shaft and the rear output shaft disappears, the control electromagnetic coil is powered off, the passive ball cam disc assembly and the armature are no longer attracted and are in a free state. Under the spring force of the wave spring, the active ball cam disc returns to its original position.

[0010] The beneficial effects of this invention include: actively distributing power between the front and rear axles through the clutch, achieving intelligent four-wheel drive systems, improving the system's responsiveness, and meeting the requirements for automatic power distribution on icy, snowy, and slippery roads. The transfer case features a four-wheel drive mechanical lock that mechanically locks the front and rear axles, ensuring driving performance in extreme off-road conditions and overcoming the clutch's thermal capacity disadvantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the assembly of the four-wheel drive locking mechanism and the clutch mechanism; Figure 3 is a schematic diagram of a planetary gear mechanism; Figure 4 Schematic diagram of the four-wheel drive locking mechanism; Figure 5 Schematic diagram of the clutch mechanism; Figure 6 This is a working diagram of the ball socket of the active ball cam disc, steel ball, and passive ball cam disc assembly; In the figure: rear output shaft 1, high and low gear sleeve 2, oil pump 3, electromagnetic coil 4, shift motor 5, shift shaft 6, driven sprocket 7, front output shaft 8, drive chain 9, shift cam 10, baffle 11, four-wheel drive fork 12, high and low gear fork 13, input shaft 14, bearing 15, planetary gear shaft 16, planetary gear 17, planetary carrier 18, four-wheel drive hub 19, four-wheel drive sleeve 20, thrust bearing 21, driving sprocket 22, clutch inner hub 23, clutch outer hub 24, steel plate 25, friction plate 26, wave spring 27, clutch pressure plate 28, armature 29, active ball cam plate 30, steel ball 31, passive ball cam plate assembly 32. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the accompanying drawings and through examples.

[0013] Refer to the attached Figure 1-6 An intelligent four-wheel drive transfer case includes a planetary gear mechanism, a rear output shaft 1, a front output shaft 8, a high and low gear sleeve 2 provided on the rear output shaft 1, an oil pump 3, a four-wheel drive locking mechanism and a clutch mechanism, a driven sprocket 7 provided on the front output shaft 8, a shift control mechanism provided parallel to the input shaft, and an electromagnetic coil 4 provided on the housing; The planetary gear mechanism includes an input shaft 14, a bearing 15, a planetary shaft 16, a planetary gear 17 and a planetary carrier 18. The input shaft 14 is engaged with the planetary gear 17 through gears. The planetary gear 17 is mounted on the planetary carrier 18 through the planetary shaft 16. The bearing 15 is provided between the input shaft 14 and the planetary carrier 18. The four-wheel drive locking mechanism includes a four-wheel drive hub 19, a four-wheel drive sleeve 20, a thrust bearing 21 and a driving sprocket 22. The four-wheel drive hub 19 is connected to the rear output shaft 1, the four-wheel drive sleeve 20 is slidably connected to the four-wheel drive hub 19, the driving sprocket 22 is provided on the rear output shaft 1, and the thrust bearing 21 is provided between the four-wheel drive hub 19 and the driving sprocket 22. The clutch mechanism includes a clutch inner gear hub 23, a clutch outer gear hub 24, a steel plate 25, a friction plate 26, a wave spring 27, a clutch pressure plate 28, an armature 29, an active ball cam plate 30, a steel ball 31 and a passive ball cam plate assembly 32. The clutch inner gear hub 23 is arranged on the rear output shaft 1, the friction plate 26 and the clutch pressure plate 28 are slidably connected to the clutch inner gear hub 23, the clutch outer gear hub 24 is connected to the driving sprocket 22, the steel plate 25 and the armature 29 are slidably connected in the clutch outer gear hub 24, the steel plate 25 and the friction plate 26 contact each other, the active ball cam plate 30 is connected to the rear output shaft 1 and can slide on the rear output shaft 1, the steel ball 31 is arranged between the active ball cam plate 30 and the passive ball cam plate assembly 32, the passive ball cam plate assembly 32 is arranged on the rear output shaft 1, and a wave spring 27 is provided on the rear output shaft 1 between the active ball cam plate 30 and the clutch inner gear hub 23, and the wave spring 27 presses on the side of the active ball cam plate 30; The shift control mechanism includes a shift motor 5, a shift shaft 6, a shift cam 10, a baffle 11, a four-wheel drive shift fork 12 and a high-low shift fork 13. The shift motor 5 and the baffle 11 are respectively fixed on the shift shaft 6, and the four-wheel drive shift fork 12 and the high-low shift fork 13 are assembled on the shift cam 10. The driven sprocket 7 on the front output shaft 8 and the driving sprocket 22 on the rear output shaft 1 are connected through a transmission chain 9 .

[0014] In this embodiment, refer to the attached Figure 1 The four-wheel drive transfer case includes a planetary mechanism, a rear output shaft 1, a high and low gear sleeve 2 and an oil pump 3 arranged on the rear output shaft 1, an electromagnetic coil 4 and a shift motor 5 arranged on the housing, a shift shaft 6 is connected to the shift motor 5, a shift cam 10 and a baffle 11 are fixed on the shift shaft 6, a four-wheel drive shift fork 12 and a high and low shift fork 13 are assembled in the assembly groove of the shift cam 10, a driven sprocket 7 is fixed on the front output shaft 8, a transmission chain 9 is connected to the driven sprocket 7 and the driving sprocket 22, the shift motor 5 controls the rotation of the shift shaft 6 to rotate the shift cam 10, drives the four-wheel drive shift fork 12 and the four-wheel drive gear sleeve 20 to move axially on the four-wheel drive gear hub 19, realizes the switching between the two-wheel drive and four-wheel drive states, drives the high and low shift fork 13 to move axially, thereby drives the high and low gear sleeve 2 to move axially on the rear output shaft 1, realizes the switching of different speed ratios of high and low gears.

[0015] Refer to the attached Figure 3 In the planetary gear mechanism, the input shaft 14 is engaged with the planetary gear 17 through gears, the planetary gear 17 is mounted on the planetary carrier 18 through the planetary gear shaft 16, and the bearing 15 is provided between the input shaft 14 and the planetary carrier 18.

[0016] Refer to the attached Figure 2 、 4In the four-wheel drive locking mechanism, the four-wheel drive hub 19 is connected to the rear output shaft 1, the driving sprocket 22 is provided on the rear output shaft 1, the thrust bearing 21 is provided between the four-wheel drive hub 19 and the driving sprocket 22, and the four-wheel drive sleeve 20 is connected to the four-wheel drive hub 19 and can slide, and can be connected to the spline on the driving sprocket 22 to perform four-wheel drive locking.

[0017] Refer to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 5 , Attachment Figure 6 In the clutch mechanism, the clutch inner gear hub 23 is spline-connected to the rear output shaft 1, friction plate 26, and clutch pressure plate 28. The friction plate 26 and clutch pressure plate 28 can slide on the clutch inner gear hub 23. The clutch outer gear hub 24 is spline-connected to the driving sprocket 22, steel plate 25, and armature 29. The steel plate 25 and armature 29 can slide in the clutch outer gear hub 24. The active ball cam plate 30 is spline-connected to the rear output shaft 1 and can slide on the rear output shaft 1. The speed of the front output shaft 8 is transmitted to the armature 29 by the driven sprocket 7, transmission chain 9, driving sprocket 22, and clutch outer gear hub 24.

[0018] When the front output shaft 8 and the rear output shaft 1 have a speed difference, the intelligent four-wheel drive control system controls the electromagnetic coil 4 to be energized to generate suction, attracting the armature 29 on the other side of the passive ball cam disc assembly 32, so that the armature 29 and the passive ball cam disc assembly 32 rotate synchronously, and the speed difference is transmitted to the active ball cam disc 30 and the passive ball cam disc assembly 32 splined with the rear output shaft 1. The steel ball 31 moves in the ball socket with a lifting angle on the active ball cam disc 30 and the passive ball cam disc assembly 32, so that the active ball cam disc 30 moves away from the passive ball cam disc assembly 32, thereby squeezing the clutch pressure plate 28, so that friction is generated between the group of steel plates 25 and friction plates 26, reducing the speed difference between the front output shaft 8 and the rear output shaft 1, and realizing four-wheel drive transmission; after the speed difference disappears, the intelligent four-wheel drive control system controls the electromagnetic coil 4 to be de-energized, and the passive ball cam disc assembly 32 and the armature 29 are no longer attracted and are in a free state. Under the spring force of the wave spring 27, the active ball cam disc 30 returns to its original position.

[0019] Under extreme off-road conditions, when the clutch cannot meet the four-wheel drive transmission requirements, the intelligent four-wheel drive system controls the shift motor 5 to work, the shift shaft 6 and the shift cam 10 to rotate, and drive the four-wheel drive fork 12 and the four-wheel drive gear sleeve 20 to move axially, and connect with the spline on the active sprocket 22 to realize four-wheel drive locking, which can realize mechanical locking of the front and rear axles, ensure the passing performance under extreme off-road conditions, and overcome the disadvantage of the clutch's thermal capacity.

[0020] As described above, the intelligent four-wheel drive transfer case of the present invention actively distributes power between the front and rear axles through a clutch, achieving intelligent four-wheel drive system response and ensuring automatic power distribution on icy, snowy, and slippery roads. The transfer case also features a four-wheel drive mechanical lock that mechanically locks the front and rear axles, ensuring driving performance in extreme off-road conditions and overcoming the clutch's thermal capacity disadvantage.

Claims

1. An intelligent four-wheel drive transfer case, characterized by: It comprises a planetary gear mechanism, a rear output shaft (1), a front output shaft (8), a high and low gear sleeve (2) arranged on the rear output shaft (1), an oil pump (3), a four-wheel drive locking mechanism and a clutch mechanism, a driven sprocket (7) arranged on the front output shaft (8), a shift control mechanism arranged parallel to the input shaft, and an electromagnetic coil (4) arranged on the housing; The planetary gear mechanism comprises an input shaft (14), a bearing (15), a planetary gear shaft (16), a planetary gear (17) and a planetary carrier (18), wherein the input shaft (14) and the planetary gear (17) are meshed with each other through gears, the planetary gear (17) is mounted on the planetary carrier (18) through the planetary gear shaft (16), and the bearing (15) is provided between the input shaft (14) and the planetary carrier (18); The four-wheel drive locking mechanism comprises a four-wheel drive gear hub (19), a four-wheel drive gear sleeve (20), a thrust bearing (21) and a driving sprocket (22), wherein the four-wheel drive gear hub (19) is connected to the rear output shaft (1), the four-wheel drive gear sleeve (20) is slidably connected to the four-wheel drive gear hub (19), the driving sprocket (22) is arranged on the rear output shaft (1), and the thrust bearing (21) is arranged between the four-wheel drive gear hub (19) and the driving sprocket (22); The clutch mechanism comprises a clutch inner gear hub (23), a clutch outer gear hub (24), a steel plate (25), a friction plate (26), a wave spring (27), a clutch pressure plate (28), an armature (29), an active ball cam plate (30), a steel ball (31) and a passive ball cam plate assembly (32), wherein the clutch inner gear hub (23) is arranged on the rear output shaft (1), the friction plate (26) and the clutch pressure plate (28) are slidably connected to the clutch inner gear hub (23), the clutch outer gear hub (24) is connected to the active sprocket (22), and the steel plate (25) is connected to the active sprocket (22). 5) and the armature (29) are slidably connected in the clutch outer gear hub (24), the active ball cam disc (30) is connected to the rear output shaft (1) and can slide on the rear output shaft (1), the steel ball (31) is arranged between the active ball cam disc (30) and the passive ball cam disc assembly (32), the passive ball cam disc assembly (32) is arranged on the rear output shaft (1), and a wave spring (27) is provided on the rear output shaft (1) between the active ball cam disc (30) and the clutch inner gear hub (23), and the wave spring (27) is pressed on the side of the active ball cam disc (30); The shift control mechanism comprises a shift motor (5), a shift shaft (6), a shift cam (10), a baffle (11), a four-wheel drive shift fork (12) and a high-low shift fork (13), wherein the shift motor (5) and the baffle (11) are respectively fixed on the shift shaft (6), and the four-wheel drive shift fork (12) and the high-low shift fork (13) are assembled on the shift cam (10); The driven sprocket (7) on the front output shaft (8) and the driving sprocket (22) on the rear output shaft (1) are connected via a transmission chain (9).

2. The intelligent four-wheel drive transfer case according to claim 1, characterized in that: The driving sprocket (22) is provided with a spline that matches the four-wheel drive gear sleeve (20).

3. The intelligent four-wheel drive transfer case according to claim 1, characterized in that: The active ball cam disc (30) and the passive ball cam disc assembly (32) are respectively provided with ball sockets matched with the steel balls (31).

4. The intelligent four-wheel drive transfer case according to claim 1, characterized in that: The shift cam (10) is provided with an assembly groove that matches the four-wheel drive shift fork (12) and the high-low shift fork (13).

5. An intelligent four-wheel drive transfer case transmission method, characterized in that: The intelligent four-wheel drive transfer case according to any one of claims 1 to 4 is used. When there is a speed difference between the front output shaft (8) and the rear output shaft (1) in the intelligent four-wheel drive gear, the intelligent four-wheel drive control system controls the electromagnetic coil (4) to be energized to generate suction, attracting the armature (29) on the other side of the passive ball cam disc assembly (32), so that the armature (29) and the passive ball cam disc assembly (32) rotate synchronously, and the speed difference is transmitted to the active ball cam disc (30) and the passive ball cam disc assembly (32) spline-connected to the rear output shaft (1). The steel ball (31) moves in the ball socket with a lifting angle on the active ball cam disc (30) and the passive ball cam disc assembly (32), so that the active ball cam disc (30) is away from the passive ball cam disc assembly (32), thereby squeezing the clutch pressure plate (28), generating friction between the group of steel plates (25) and friction plates (26), reducing the speed difference between the front output shaft (8) and the rear output shaft (1), and realizing four-wheel drive transmission; Under extreme off-road conditions, when the clutch cannot meet the four-wheel drive transmission requirements, the shift motor (5) works, the shift shaft (6) and the shift cam (10) rotate, driving the four-wheel drive fork (12) and the four-wheel drive gear sleeve (20) to move axially, and connect with the spline on the driving sprocket (22) to realize four-wheel drive locking, and can realize mechanical locking of the front and rear axles, thereby ensuring the passing performance under extreme off-road conditions.

6. The intelligent four-wheel drive transfer case transmission method according to claim 5, characterized in that: In the intelligent four-wheel drive gear, after the speed difference between the current output shaft (8) and the rear output shaft (1) disappears, the electromagnetic coil (4) is controlled to be powered off, the passive ball cam disc assembly (32) and the armature (29) are no longer attracted and are in a free state, and under the spring force of the wave spring (27), the active ball cam disc (30) returns to its original position.

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