Timely transfer system with mechanical locking function

Abstract

The timely transfer system with the mechanical locking function comprises a transfer case transmission system and a gear shifting system, and the transfer case transmission system comprises an input shaft, a planetary speed reduction mechanism, a 4L combination sleeve, a rear output shaft and a rear output flange which are horizontally arranged in sequence; a front output shaft and a gear shifting shaft are arranged below the rear output shaft, a gear shifting cam, a gear shifting gear, a cam structure, a clutch, a driving chain wheel and a mechanical locking combination sleeve are sequentially arranged on the rear output shaft, and a driven chain wheel in transmission connection with a chain of the driving chain wheel is arranged on the front output shaft. The gear shifting system drives the gear shifting gear to rotate clockwise and anticlockwise; the driving cam mechanism compresses the clutch, transmits torque to the front output shaft and can drive the gear shifting shaft to move axially at the same time, the mechanical locking sleeve is combined, strong torque is transmitted to the front output shaft by arranging the mechanical locking sleeve, the strong cross-country requirement of customers can be met, and the clutch is protected. And a mechanical locking working condition and a timely four-wheel drive mode are compatible for use.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle transmission and transfer, and in particular to a timely transfer system with mechanical locking. Background Art

[0002] The vehicle power transfer case is a device that distributes the engine power, and can output power to the rear axle, or to the front / rear axle at the same time. A timely four-wheel drive vehicle is a vehicle that can be a two-wheel drive vehicle at ordinary times, but can be converted to a four-wheel drive vehicle in off-road conditions. The current timely transfer case relies on the clutch to transmit the front output torque, and in severe off-road conditions, the clutch is prone to slippage, overheating, or ablation, which affects the customer's off-road experience and vehicle reliability. Summary of the invention

[0003] The present invention provides a timely transfer system with mechanical locking, which can transmit strong torque to the front output shaft through the mechanical locking sleeve, can meet the strong off-road needs of customers, and protect the clutch.

[0004] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: a timely transfer system with mechanical locking, including a transfer case transmission system and a shifting system, wherein the transfer case transmission system includes an input shaft, a planetary reduction mechanism, a 4L coupling sleeve, a rear output shaft and a rear output flange which are arranged horizontally in sequence;

[0005] A front output shaft and a shift shaft are respectively arranged below the rear output shaft, a shift cam, a shift gear, a cam structure, a clutch, a driving sprocket and a mechanical locking sleeve are arranged on the rear output shaft in sequence, and a passive sprocket is arranged on the front output shaft in transmission connection with the driving sprocket;

[0006] The shift system is used to drive the shift gear to rotate clockwise or counterclockwise; the shift cam is used to drive the 4L shift fork inside it to move the reduction gear sleeve forward and backward when the shift gear rotates, thereby realizing 4L shifting; the shift shaft is used to drive the mechanical locking coupling sleeve to approach the driving sprocket when the shift gear rotates counterclockwise, and further transmit the torque transmitted to the mechanical locking coupling sleeve by the rear output shaft to the driving sprocket; the cam structure is used to move close to the clutch to press the clutch when the shift gear rotates clockwise, and further transmit the torque transmitted to the clutch by the rear output shaft to the driving sprocket.

[0007] Preferably, the shift system comprises a shift motor, and the output end of the shift motor and the shift gear transmit torque via a three-stage gear.

[0008] Preferably, the shift cam is transmission-connected with the shift gear, and tracks are respectively provided on the inner and outer walls of the shift cam, and the tracks include a ramp slide and a plane slide; the inner wall track is used to cooperate with the pin shaft of the 4L shift fork, and the outer wall track is used to cooperate with the shift finger of the shift shaft.

[0009] Preferably, a mechanical locking fork is provided between the shift shaft and the mechanical locking coupling sleeve.

[0010] Preferably, a shift support shell is provided between the shift cam, the shift gear, the cam structure and the rear output shaft, the shift support shell is fixedly connected to the outer shell, and the driving sprocket is loosely sleeved on the rear output shaft.

[0011] Preferably, the cam structure includes a passive cam and an active cam, the passive cam is fixed on the shift support shell, and the passive cam and the active cam are provided with a ramp groove on the opposite side, and a steel ball is provided in the ramp groove; the shift gear is provided with a shift finger on the side close to the cam structure, and the shift finger is used to shift the active cam to rotate counterclockwise with the shift gear; the steel ball is used to climb the ramp groove when the active cam rotates counterclockwise, thereby driving the active cam away from the passive cam.

[0012] Preferably, the rear output shaft is provided with a shoulder for preventing the passive cam from moving in the direction of the shift cam and allowing the active cam to move in the direction of the clutch.

[0013] Preferably, washers and thrust bearings are provided on both sides of the passive cam and the active cam, respectively.

[0014] Preferably, the clutch includes a clutch hub, a friction plate, a steel plate and a clutch housing which are sequentially sleeved on the outside of the rear output shaft from the inside to the outside, the clutch hub is splined to the rear output shaft, the steel plate is splined to the clutch housing, and the clutch housing is fixed on the driving sprocket; a pressure plate is provided between the clutch hub and the clutch housing on the side close to the cam structure, and the pressure plate is used to press the friction plate so that the torque of the rear output shaft is sequentially transmitted to the driving sprocket via the clutch hub, the friction plate, the steel plate and the clutch housing.

[0015] Preferably, a shift cam plate is provided on the shift cam, and the shift cam plate and the shift cam cooperate with each other through a mounting structure and rotate together; steps with different radii are respectively provided on the shift cam plate and the shift gear, and a position sensor for identifying the step position is provided on the outer shell.

[0016] The beneficial effects of the present invention are:

[0017] This solution transmits strong torque to the front output shaft by setting a mechanical locking sleeve, which can meet the strong off-road needs of customers and protect the clutch. Relying on the original shift gear of the transfer case transmission system, the mechanical locking sleeve is driven close to the driving sprocket through the shift shaft, and the torque transmitted to the mechanical locking sleeve by the rear output shaft is further transmitted to the driving sprocket. It does not need to add too many components to meet the strong off-road needs of customers and protect the clutch. In addition, the clutch is retained, and the clutch is still used for light off-road in the timely four-wheel drive mode. The mechanical locking condition is compatible with the timely four-wheel drive mode.

[0018] This solution provides tracks on the inner and outer walls of the shift cam, respectively. The tracks include a ramp slide and a flat slide. Through simple changes, the torque limit output in the 4H and 4L gears can be achieved, thereby meeting the reliability and off-road performance of customers' strong off-road needs. When entering the mechanical locking condition, the counterclockwise rotation of the shift gear will not drive the cam structure to rotate. In addition, when entering the timely four-wheel drive mode, the pin shaft of the 4L shift fork and the shift shaft finger are on the flat slide of the track, and no shifting or mechanical locking condition will be performed. The two conditions do not affect each other.

[0019] In this solution, a shift cam plate is provided on the shift cam, and the shift cam plate and the shift cam are matched by a mounting structure and rotate together; steps of different radius are provided on the shift cam plate and the three-pole shift gear, and a position sensor for identifying the position of the step is provided on the outer shell. By identifying the position of the step, the position of the shift cam plate and the three-pole shift gear is determined, and then the position of the shift cam, the shift motor and the active cam is determined, and then the position of the 4L coupling sleeve and the mechanical locking coupling sleeve is identified, so as to identify the actual gear position and state of the transfer case. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a cross-sectional view of the transfer case transmission system of the present invention.

[0022] Figure 2 It is a partial structural schematic diagram of the transfer case transmission system of the present invention.

[0023] Figure 3 It is an exploded view of some components of the transfer case transmission system of the present invention.

[0024] Figure 4The figure is a schematic diagram of the positional relationship among the clutch, the driving sprocket and the mechanical locking sleeve in the transfer case transmission system of the present invention.

[0025] Figure 5 It is a cross-sectional view of the clutch of the present invention.

[0026] Figure 1-5 Among them, 1. input shaft, 2. planetary reduction mechanism, 3. 4L coupling sleeve, 4. front housing, 5. shift cam, 6. shift gear, 61. primary shift gear, 62. secondary shift gear, 63. triple shift gear, 7. cam structure, 71. active cam, 72. passive cam, 73. steel ball, 8. clutch, 81. clutch hub, 82. pressure plate, 83. clutch housing, 84. steel sheet, 85. friction plate, 9. rear output shaft, 10. active sprocket, 11. rear output flange, 12. mechanical locking coupling sleeve, 13. mechanical locking fork, 14. shift shaft, 15. passive sprocket, 16. chain, 17. rear housing, 18. front output shaft, 19. shift motor, 20. position sensor, 21. shift support shell, 22. shift cam plate, 23. 4L shift fork. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0029] At the same time, it should be noted that: unless otherwise defined, the technical terms or scientific terms used in this article should be the ordinary meaning understood by people with ordinary skills in the technical field to which the present invention belongs. The meaning of "multiple" used in the patent application specification and claims of the present invention is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front end", "rear end", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0030] The present invention is further described in detail below in conjunction with embodiments and with reference to the accompanying drawings.

[0031] Embodiment 1:

[0032] The present invention discloses a timely transfer system with mechanical locking. Figure 1-3 As shown, the embodiment includes a transfer case transmission system and a shifting system, wherein the transfer case transmission system includes an input shaft 1, a planetary reduction mechanism 2, a 4L coupling sleeve 3, a rear output shaft 9 and a rear output flange 11 which are horizontally arranged in sequence.

[0033] Normally, the torque of the gearbox is input through the input shaft 1 and reduced by the planetary reduction mechanism 2. The reduction gear sleeve of the 4L coupling sleeve 3 can move left and right under the drive of the 4L shift fork 23 to control the torque transmission path of the input shaft 1 torque to the rear output shaft 9 or whether to transmit torque.

[0034] A front output shaft 18 and a shift shaft 14 are respectively disposed below the rear output shaft 9, and a shift cam 5, a shift gear 6, a cam structure 7, a clutch 8, a driving sprocket 10 and a mechanical locking sleeve 12 are sequentially disposed on the rear output shaft 9. A passive sprocket 15 is disposed on the front output shaft 18 and is transmission-connected to the driving sprocket 10, and the driving sprocket 10 and the passive sprocket 15 are specifically transmission-connected through a chain 16.

[0035] Under two-wheel drive conditions, the gearbox torque is transmitted to the 4L coupling sleeve 3 through the input shaft 1, and then to the rear output shaft 9, and finally to the rear drive shaft through the rear output shaft 9 and the rear output flange 11 to drive the rear wheels of the vehicle to rotate. The driving sprocket 10 is sleeved on the rear output shaft 9, and there is no torque input at this time, the driven sprocket 15 has no torque transmission, and the front output shaft 18 has no torque output.

[0036] The shift system is used to drive the shift gear 6 to rotate clockwise or counterclockwise. The shift cam 5 is used to drive the 4L shift fork 23 inside the shift cam 5 to move the reduction gear sleeve forward and backward when the shift gear 6 rotates, thereby realizing 4L shifting.

[0037] In the timely four-wheel drive mode, the cam structure 7 is used to move close to the clutch 8 to press the clutch 8 when the shift gear 6 rotates clockwise, and further transmit the torque transmitted from the rear output shaft 9 to the clutch 8 to the driving sprocket 10. The torque on the rear output shaft 9 is transmitted to the front output shaft 18 through the clutch 8, the driving sprocket 10, and the passive sprocket 15, and the front output shaft 18 is transmitted to the front drive shaft of the vehicle to drive the front wheels of the vehicle to rotate. By controlling the rotation of the shift gear 6 through the shift system, the degree of compression of the clutch 8 can be controlled, and the torque transmitted from the rear output shaft 9 to the front output shaft 18 can be controlled, so as to realize the intelligent dynamic output of the torque to the front wheels of the vehicle, thereby improving the safety, comfort, and off-road performance of the vehicle.

[0038] When the vehicle needs to go off-road, including getting out of trouble, climbing steep slopes, etc., and the front output shaft 18 needs to output the torque to the limit, the vehicle enters the mechanical locking state. The shift shaft 14 is used to drive the mechanical locking sleeve 12 to approach the driving sprocket 10 when the shift gear 6 rotates counterclockwise, and further transmit the torque transmitted from the rear output shaft 9 to the mechanical locking sleeve 12 to the driving sprocket 10. By controlling the shift gear 6 to rotate through the shift system, the mechanical locking sleeve 12 can be driven to approach the driving sprocket 10, and part of the torque on the rear output shaft 9 is controlled to be transmitted to the driving sprocket 10 through the mechanical locking sleeve, and then transmitted to the front output shaft 18 through the passive sprocket 15, so as to achieve the limit output of the torque of the front output shaft 18, meet the reliability and off-road performance of the customer's strong off-road needs, and do not damage the clutch 8.

[0039] Embodiment 2:

[0040] like Figure 1-3 As shown, the difference between this embodiment and embodiment 1 is that a shift support shell 21 is provided between the shift cam 5, the shift gear 6, the cam structure 7 and the rear output shaft 9, the shift support shell 21 is fixedly connected to the outer shell, and the driving sprocket 10 is loosely sleeved on the rear output shaft 9. A mechanical locking fork 13 is provided between the shift shaft 14 and the mechanical locking coupling sleeve 12. The outer shell includes a front shell 4 and a rear shell 17.

[0041] Embodiment 3:

[0042] like Figure 1-3 As shown, the difference between this embodiment and embodiment 1 is that the shift cam 5 is transmission-connected with the shift gear 6, and the inner wall and outer wall of the shift cam 5 are respectively provided with tracks, and the tracks include a ramp slide and a plane slide. The inner wall track is used to cooperate with the pin of the 4L shift fork 23, and the outer wall track is used to cooperate with the shift finger of the shift shaft 14.

[0043] When the shift cam 5 rotates, the 4L shift fork 23 moves on the ramp slideway on the inner wall of the shift cam 5, driving the reduction gear sleeve to move left and right, and realizing 4L shifting. When the shift cam 5 rotates, the shift finger of the shift shaft 14 moves on the ramp slideway on the outer wall of the shift cam 5, driving the mechanical locking coupling sleeve 12 to move left and right, and entering the mechanical locking condition. When entering the mechanical locking condition, the counterclockwise rotation of the shift gear 6 will not drive the cam structure 7 to rotate. In addition, when entering the timely four-wheel drive mode, the pin shaft of the 4L shift fork 23 and the shift finger of the shift shaft 14 are on the plane slideway of the track, and will not shift gears or enter the mechanical locking condition. The two conditions do not affect each other.

[0044] 4H gear position: The shift system drives the shift gear 6 to rotate counterclockwise, and the 4L shift fork 23 slides on the flat slideway on the inner wall of the shift cam 5, but the shift finger of the shift shaft 14 slides on the slope slideway on the outer wall of the shift cam 5. The shift shaft 14 moves to the left and drives the mechanical locking fork 13 to move the mechanical locking sleeve 12 to the left together. The splines on the mechanical locking sleeve 12 are combined with the splines on the driving sprocket 10. At the same time, the inner diameter of the mechanical locking sleeve 12 is designed with internal splines to cooperate with the rear output shaft 9, and can slide left and right on the rear output shaft 9. When the mechanical locking sleeve 12 is combined with the splines of the driving sprocket 10, part of the torque on the rear output shaft 9 is transmitted to the driving sprocket 10 through the mechanical locking sleeve 12, and is transmitted to the front output shaft 18 through the chain 16 and the driven sprocket 15, and finally to the front drive shaft of the vehicle. At the same time, the torque on the rear output shaft 9 is transmitted to the rear drive shaft of the vehicle through the rear output flange 11, and the vehicle realizes four-wheel drive.

[0045] 4L gear: When the 4H gear is maintained, the shift system drives the shift gear 6 to continue to rotate counterclockwise. At this time, the shift finger of the 4L shift fork 22 moves on the ramp slide on the inner wall of the shift cam 5, driving the 4L shift fork 22 to move to the right, and the reduction gear sleeve moves to the right at the same time. The outer spline of the 4L coupling sleeve 3 is combined with the inner spline of the planetary carrier of the planetary reduction mechanism 2, and the inner spline of the 4L coupling sleeve 3 is combined with the outer spline of the rear output shaft 9. The torque of the input shaft 1 needs to be reduced and torque-increased through the planetary reduction mechanism 2 and transmitted to the 4L coupling sleeve 3, and then transmitted to the rear output shaft 9 through the 4L coupling sleeve 3. At this time, the mechanical locking coupling sleeve 12 remains in a state of being combined with the driving sprocket 10, so the torque on the rear output shaft 9 is distributed from the rear output 9 to the rear flange 11 and the front output shaft 18 at the same time, and the vehicle achieves low-speed four-wheel drive.

[0046] Similarly, a series of shifting actions can be driven by controlling the shifting system, so that the 4L coupling sleeve 3 is directly connected to the input shaft 1 and the rear output shaft 9, and the mechanical lock is disconnected, and the 2WD mode is restored.

[0047] Embodiment 4:

[0048] like Figure 1-3 As shown, the difference between this embodiment and embodiment 2 is that the shift system includes a shift motor 19, the output end of the shift motor 19 and the shift gear 6 are torque-transmitted through three-stage gears, the three-stage gears include a primary shift gear 61, a secondary shift gear 62 and a triple shift gear 63, the primary shift gear 61 is arranged on the output shaft of the shift motor 19, and the triple shift gear 63 is arranged on the shift support housing 21. Through the three-stage gear torque transmission, the rationality of the overall arrangement of the shift motor 19 and the internal components of the transfer case transmission system is improved, and no interference with the shift shaft 14 is caused.

[0049] Embodiment 5:

[0050] like Figure 1-3 As shown, the difference between this embodiment and embodiment 1 is that the cam structure 7 includes a passive cam 72 and an active cam 71. The passive cam 72 is fixed on the shift support shell 21 and fixed by a special keyway and a snap ring to ensure that the passive cam 72 is limited by the shift support shell 21 and cannot rotate. A ramp groove is provided on the opposite side of the passive cam 72 and the active cam 71, and a steel ball 73 is provided in the ramp groove. A shifting finger is provided on the side of the shifting gear 6 close to the cam structure 7, and the shifting finger is used to shift the active cam 71 to rotate counterclockwise with the shifting gear 6; the steel ball 73 is used to climb the ramp groove when the active cam 71 rotates counterclockwise, thereby driving the active cam 71 away from the passive cam 72. By controlling the rotation position of the shifting system, the rotation angle of the active cam 71 relative to the passive cam 72 can be adjusted, thereby controlling the axial movement displacement of the active cam 71, controlling the degree of compression of the clutch 8, and making the clutch 8 output different torques forward, thereby realizing active and intelligent control of the front output torque.

[0051] Embodiment 6:

[0052] like Figure 1-3 As shown, the difference between this embodiment and embodiment 5 is that: a shoulder is provided on the rear output shaft 9 to prevent the passive cam 72 from moving toward the shift cam 5 and to allow the active cam 71 to move toward the clutch 8. Washers and thrust bearings are provided on both sides of the passive cam 72 and the active cam 71, respectively, to transmit the axial force while absorbing the differential between the rear output shaft 9, the passive cam plate 72, the clutch 8 and the active cam 71.

[0053] Embodiment 7:

[0054] like Figure 1-5 As shown, the difference between this embodiment and embodiment 5 is that: the clutch 8 includes a clutch hub 81, a friction plate 85, a steel plate 84 and a clutch housing 83 which are sequentially sleeved on the outside of the rear output shaft 9 from the inside to the outside, the clutch hub 81 is splined to the rear output shaft 9, the steel plate 84 is splined to the clutch housing 83, and the clutch housing 83 is fixed on the driving sprocket 10; a pressure plate 82 is provided between the clutch hub 81 and the clutch housing 83 on the side close to the cam structure 7, and the pressure plate 82 is used to press the friction plate 85, so that the torque of the rear output shaft 9 is sequentially transmitted to the driving sprocket 10 via the clutch hub 81, the friction plate 85, the steel plate 84 and the clutch housing 83.

[0055] By controlling the shift gear 6 to rotate through the shift system, the rotation angle of the active cam 71 relative to the passive cam 72 can be controlled, thereby controlling the degree of compression of the clutch pressure plate 82 and the torque transmitted from the friction plate 85 to the steel plate 84. Ultimately, the output torque of the front wheels of the vehicle can be intelligently controlled, thereby improving the safety, comfort and off-road performance of the vehicle.

[0056] Embodiment 8:

[0057] like Figure 1-3 As shown, the difference between this embodiment and embodiment 4 is that: the shift cam 5 is provided with a shift cam plate 22, and the shift cam plate 22 and the shift cam 5 are matched through the mounting structure and rotate together; the shift cam plate 22 and the three-pole shift gear 63 are respectively provided with steps of different radius, and the outer shell is provided with a position sensor 20 for identifying the position of the step. By identifying the position of the step, the position of the shift cam plate 22 and the three-pole shift gear 63 is determined, and then the position of the shift cam 5, the shift motor 19 and the active cam 71 is determined, and then the position of the 4L coupling sleeve 3 and the mechanical locking coupling sleeve 12 is identified, so as to identify the actual gear position and state of the transfer case.

[0058] The present invention can realize the addition of 4H and 4L gear mechanical locks on the basis of the timely transfer case, and realize the torque limit output in 4H and 4L gears, thereby meeting the reliability and off-road performance of customers' strong off-road needs. At the same time, the intelligent torque output through the clutch is retained to meet the safety and stability of customers' intelligent four-wheel drive in mild off-road and urban conditions.

[0059] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A timely transfer system with mechanical locking, characterized in that: It comprises a transfer case transmission system and a gear shifting system, wherein the transfer case transmission system comprises an input shaft (1), a planetary reduction mechanism (2), a 4L coupling sleeve (3), a rear output shaft (9) and a rear output flange (11) which are arranged horizontally in sequence; A front output shaft (18) and a shift shaft (14) are respectively arranged below the rear output shaft (9); a shift cam (5), a shift gear (6), a cam structure (7), a clutch (8), a driving sprocket (10) and a mechanical locking sleeve (12) are arranged on the rear output shaft (9) in sequence; and a driven sprocket (15) is provided on the front output shaft (18) and is transmission-connected to the driving sprocket (10); The shift system is used to drive the shift gear (6) to rotate clockwise or counterclockwise; the shift cam (5) is used to drive the 4L shift fork (23) therein to drive the reduction gear sleeve to move forward and backward when the shift gear (6) rotates, thereby realizing 4L shifting; the shift shaft (14) is used to drive the mechanical locking coupling sleeve (12) to approach the driving sprocket (10) when the shift gear (6) rotates counterclockwise, and further transmit the torque transmitted from the rear output shaft (9) to the mechanical locking coupling sleeve (12) to the driving sprocket (10); the cam structure (7) is used to move close to the clutch (8) to press the clutch (8) when the shift gear (6) rotates clockwise, and further transmit the torque transmitted from the rear output shaft (9) to the clutch (8) to the driving sprocket (10).

2. The timely transfer system with mechanical locking according to claim 1, characterized in that: The gear shifting system comprises a gear shifting motor (19), and the output end of the gear shifting motor (19) and the gear shifting gear (6) are used to transmit torque via three-stage gears.

3. The timely transfer system with mechanical locking according to claim 1, characterized in that: The shift cam (5) is transmission-connected to the shift gear (6); the inner wall and outer wall of the shift cam (5) are respectively provided with tracks, the tracks comprising a slope slide and a plane slide; the inner wall track is used to cooperate with the pin shaft of the 4L shift fork (23), and the outer wall track is used to cooperate with the shift finger of the shift shaft (14).

4. The timely transfer system with mechanical locking according to claim 1, characterized in that: A mechanical locking fork (13) is provided between the shift shaft (14) and the mechanical locking coupling sleeve (12).

5. The timely transfer system with mechanical locking according to claim 1, characterized in that: A shift support shell (21) is provided between the shift cam (5), the shift gear (6), the cam structure (7) and the rear output shaft (9); the shift support shell (21) is fixedly connected to the outer shell; and the driving sprocket (10) is loosely sleeved on the rear output shaft (9).

6. The timely transfer system with mechanical locking according to claim 5, characterized in that: The cam structure (7) comprises a passive cam (72) and an active cam (71); the passive cam (72) is fixed on the shift support housing (21); a slope groove is provided on the opposite side of the passive cam (72) and the active cam (71); a steel ball (73) is provided in the slope groove; a shifting finger is provided on the side of the shifting gear (6) close to the cam structure (7); the shifting finger is used to shift the active cam (71) to rotate counterclockwise with the shifting gear (6); the steel ball (73) is used to climb the slope groove when the active cam (71) rotates counterclockwise, thereby driving the active cam (71) away from the passive cam (72).

7. The timely transfer system with mechanical locking according to claim 6, characterized in that: The rear output shaft (9) is provided with a shaft shoulder which prevents the passive cam (72) from moving in the direction of the shift cam (5) and allows the active cam (71) to move in the direction of the clutch (8).

8. The timely transfer system with mechanical locking according to claim 6, characterized in that: Gaskets and thrust bearings are respectively provided on both sides of the passive cam (72) and the active cam (71).

9. The timely transfer system with mechanical locking according to claim 1, characterized in that: The clutch (8) comprises a clutch hub (81), a friction plate (85), a steel plate (84) and a clutch housing (83) which are sequentially sleeved on the outside of the rear output shaft (9) from the inside to the outside, the clutch hub (81) is spline-connected to the rear output shaft (9), the steel plate (84) is spline-fixedly connected to the clutch housing (83), and the clutch housing (83) is fixed on the driving sprocket (10); a pressure plate (82) is provided between the clutch hub (81) and the clutch housing (83) on the side close to the cam structure (7), and the pressure plate (82) is used to press the friction plate (85), so that the torque of the rear output shaft (9) is sequentially transmitted to the driving sprocket (10) via the clutch hub (81), the friction plate (85), the steel plate (84) and the clutch housing (83).

10. The timely transfer system with mechanical locking according to claim 5, characterized in that: The shift cam (5) is provided with a shift cam disc (22), and the shift cam disc (22) and the shift cam (5) are matched through a mounting structure and rotate together; the shift cam disc (22) and the shift gear (6) are respectively provided with steps of different radii, and the outer shell is provided with a position sensor (20) for identifying the position of the step.

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