Transfer case with front drive and rear drive independently separated

Abstract

The invention relates to the technical field of transfer cases, in particular to a transfer case with independent and separated front drive and rear drive, which comprises a protective shell, and one end of a rear connecting shaft is connected with a second adapter. According to the transfer case with the front drive and the rear drive independently separated, through comprehensive optimization design of internal power transmission and the operation environment, a system can keep a stable and continuous power output state under different working conditions, and the transmission efficiency and the operation reliability of the whole vehicle under the conditions of high-speed running, heavy-load running and the like are effectively improved; in the working process, the impact load and the abrasion degree of a transmission part can be effectively reduced, performance fluctuation caused by uneven structural stress or instantaneous load change is reduced, and therefore the overall transmission stability is improved, the service life is prolonged, meanwhile, the internal protection structure and the circulation environment are reasonably arranged, and the service life is prolonged. Impurities can be effectively prevented from entering the transfer case, the maintenance frequency and the use cost are reduced, and the requirements of various vehicle driving forms and complex use environments can be met.

Description

Technical Field

[0001] This invention relates to the field of transfer case technology, and more particularly to a transfer case with independent front and rear drive separation. Background Technology

[0002] The transfer case is a core transmission component in four-wheel drive vehicles. Its main function is to rationally distribute the engine's power output to the front and rear drive shafts, handle the switching between two-wheel drive and four-wheel drive modes, and adjust the torque ratio between the front and rear axles to adapt to different road conditions. It is a key device to ensure vehicle passability and power transmission efficiency. Currently, transfer cases suffer from poor stability when the front and rear drives are independently separated or driven synchronously. When driven independently, the meshing precision of the engagement sleeve and gears in some models is insufficient. After switching to two-wheel drive mode, incomplete separation can easily occur, resulting in slight dragging of the non-drive axle. This not only increases fuel consumption but also causes abnormal transmission noise, accelerated component wear, and in extreme cases, affects steering agility. When driven synchronously, uneven torque distribution is a core pain point. Ordinary transfer cases cannot adjust the power ratio between the front and rear axles in real time according to road conditions. When the wheels slip, power imbalance can easily occur, causing vehicle vibration and deviation. In addition, lubricating oil leakage caused by bearing wear and aging seals inside the transfer case, as well as signal delays and actuator jamming in the electronic transfer case, further reduce drive stability and affect vehicle driving safety and driving experience. Therefore, a transfer case with independent front and rear drive separation is needed.

[0003] To address the aforementioned issues, a search revealed a patent with publication number CN110822029A, which discloses a transfer case with independent front and rear drive separation. The patent states that it "includes a front-drive low-speed gear, a transmission gear sleeve assembly, a front-drive gear sleeve assembly, a transmission switching device, a housing, and an input gear shaft, an intermediate gear shaft, a rear drive shaft, a front drive spline shaft, and a drive switching device mounted on the housing. A rear drive high-speed gear and a rear drive low-speed gear are rotatably mounted on the rear drive shaft, respectively meshing with the intermediate gear shaft. The transmission gear sleeve assembly is circumferentially fixed to the rear drive shaft and detachably circumferentially fixed to the rear drive high-speed gear and the rear drive low-speed gear, respectively. The front drive gear sleeve assembly is circumferentially fixed to the rear drive shaft and detachably circumferentially fixed to the front drive low-speed gear. The transmission gear sleeve assembly and the front drive gear sleeve assembly are adaptively fitted with the transmission switching device, avoiding clearance, preventing transfer case damage, and increasing the transfer case's service life." While this approach avoids clearance, it cannot achieve long-term protection and cannot maintain this effect indefinitely.

[0004] In light of this, in-depth research into the aforementioned issues led to the creation of this case. Summary of the Invention

[0005] The purpose of this invention is to provide a front and rear drive independent separation transfer case to solve the problem of poor stability in the use of existing front and rear drive independent separation transfer cases mentioned in the background art. When the drive is separated, the meshing accuracy of the engagement sleeve and gear in some models is insufficient. After switching to two-wheel drive mode, incomplete separation is prone to occur, resulting in slight drag of the non-drive axle. This not only increases fuel consumption but also causes abnormal transmission noise, accelerated wear of components, and in extreme cases, affects steering flexibility. When driven synchronously, uneven torque distribution is the core pain point. Ordinary transfer cases cannot adjust the power ratio of the front and rear axles in real time according to road conditions. When the wheels slip, power imbalance is prone to occur, causing vehicle vibration and deviation. In addition, lubricating oil leakage caused by bearing wear and aging of seals inside the transfer case, as well as signal delay and actuator jamming of the electronic control transfer case, further reduce drive stability and affect vehicle driving safety and driving experience.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a transfer case with independent front and rear drive separation, including a protective shell. The outer side of the protective shell is provided with a first adapter. One end of the first adapter is connected to a front connecting shaft. The outer side of the front connecting shaft is connected to a front connecting gear. A spline shaft is provided on one side of the front connecting gear. A first driven gear is fitted on the outer side of the spline shaft. A front pull-out is fitted on the outer side of the first driven gear. A main drive gear is fitted on the outer side of the first driven gear. A toothed chain is fitted on the outer side of the front connecting gear. A rear connecting gear is fitted on the inner side of the toothed chain. A rear connecting shaft is connected through the inner side of the rear connecting gear. A third disc gear is connected on the outer side of the rear connecting shaft. A fourth disc gear is fitted on one end of the third disc gear. A rear output gear is welded to one end of the fourth disc gear. A second adapter is connected to one end of the rear connecting shaft.

[0007] Preferably, the flange connection to the first adapter is connected on both sides of the protective shell, and a flange is fitted onto one end of both the first adapter and the second adapter.

[0008] Preferably, both ends of the front connecting shaft and the rear connecting shaft are simultaneously connected to a first adapter and a second adapter.

[0009] Preferably, a front output gear is sleeved on the outer side of the front connecting shaft, and a second disc gear is welded to one end of the front output gear, with one end of the second disc gear meshing with the front connecting gear.

[0010] Preferably, both ends of the front connecting shaft and the rear output gear are simultaneously provided with a front connecting shaft, a first disc gear, a front output gear, a second disc gear, a rear connecting shaft, a third disc gear, a fourth disc gear, a rear output gear, and a second adapter.

[0011] Preferably, a limiting ring is welded to one end of the front connecting gear, an insert block is welded to one side of the first driven gear, and an insert groove is opened at one end of the front connecting gear. The insert block and the insert groove are arranged in six groups in a circular, equally spaced array at both ends of the front connecting gear and the first driven gear.

[0012] Preferably, the front connecting gear and the first driven gear, as well as the rear connecting gear and the second driven gear, are simultaneously provided with an insert block and an insert groove.

[0013] Preferably, the splined shaft is connected to the first driven gear to form a sliding structure.

[0014] Preferably, a protective pad is attached to the inner side of the front plug, one end of the front plug is connected to a driver, the driver is connected to the inner side of the protective shell, and drivers are connected to the outer sides of both the front plug and the rear plug.

[0015] Preferably, a connecting pipe is connected through the outer side of the protective shell, a filter screen is sleeved on the inner side of the connecting pipe, a protective cover is threaded to the outer side of the connecting pipe, and a handle is welded to the top of the protective cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This transfer case with independent front and rear drive, through optimized design of the cooling medium flow path and cooling method, enables the cooling process to achieve stable and continuous medium output according to the processing state, effectively improving the heat dissipation efficiency of the workpiece under high-speed cutting, heavy-load processing and other conditions. During operation, this cooling device can quickly remove the heat generated in the processing area, significantly reduce the temperature rise of the workpiece surface and interior, reduce the processing dimensional deviation caused by thermal deformation, thereby improving processing accuracy and product consistency. At the same time, the cooling process is more stable, avoiding the decline in workpiece surface quality caused by uneven cooling or instantaneous impact in traditional cooling methods.

[0017] 2. This transfer case with independent front and rear drive separation effectively prevents impurities from entering the cooling system through reasonable design of the internal circulation environment and protective structure, extending the service life of the device, reducing maintenance frequency and operating costs. In addition, the cooling device can adapt to various processing conditions and processing requirements of different materials, has good versatility and reliability, and can be widely used in various machining center equipment, thereby improving the overall processing efficiency and comprehensive performance of equipment operation. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connecting shaft structure before the first adapter of the present invention is connected; Figure 3This is a schematic diagram of the driver assembly front plug-in structure of the present invention; Figure 4 This is a schematic diagram of the first driven gear connecting embedded block structure of the present invention; Figure 5 A schematic diagram of the embedded groove structure for the front connecting gear of the present invention; Figure 6 This is a schematic diagram of the front connecting gear meshing tooth chain structure of the present invention; Figure 7 This is a schematic diagram of the overall structure of the rear output gear of the present invention; Figure 8 This is a schematic diagram of the structure of the connecting pipe and protective cover of the present invention.

[0019] In the diagram: 1. Protective shell; 2. First adapter; 3. Flange; 4. Front connecting shaft; 5. First disc gear; 6. Front output gear; 7. Second disc gear; 8. Front connecting gear; 9. Limiting ring; 10. Splined shaft; 11. First driven gear; 12. Insert block; 13. Insert groove; 14. Front plug-in; 15. Main drive gear; 16. Driver; 17. Gear chain; 18. Protective gasket; 19. Rear connecting gear; 20. Second driven gear; 21. Rear plug-in; 22. Rear connecting shaft; 23. Third disc gear; 24. Fourth disc gear; 25. Rear output gear; 26. Second adapter; 27. Connecting pipe; 28. Filter screen; 29. ​​Protective cover; 30. Handle. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-8 The present invention provides a technical solution: a transfer case with independent front and rear drive separation, including a protective shell 1. A first adapter 2 is provided on the outer side of the protective shell 1. One end of the first adapter 2 is connected to a front connecting shaft 4. A front connecting gear 8 is connected to the outer side of the front connecting shaft 4. A splined shaft 10 is provided on one side of the front connecting gear 8. A first driven gear 11 is fitted on the outer side of the splined shaft 10. A front pull-out insert 14 is fitted on the outer side of the first driven gear 11. A main drive gear 15 is meshed and connected to the outer side of the first driven gear 11. A gear chain 17 is fitted on the outer side of the front connecting gear 8. A rear connecting gear 19 is fitted on the inner side of the gear chain 17. A rear connecting shaft 22 is passed through the inner side of the rear connecting gear 19. A third disc gear 23 is connected to the outer side. One end of the third disc gear 23 is meshed with a fourth disc gear 24. One end of the fourth disc gear 24 is welded with a rear output gear 25. One end of the rear connecting shaft 22 is connected to a second adapter 26. Through the setting of the first driven gear 11, it meshes with the main drive gear 15 to receive power. At the same time, it achieves axial sliding through the guide of the spline shaft 10. When the driver 16 drives it to move axially, the embedded block 12 precisely cooperates with the embedded groove 13 of the front connecting gear 8 to stably transmit the power of the main drive gear 15 to the front connecting gear 8, thereby driving the front connecting shaft 4 to output power.

[0022] Furthermore, the flange 3 connects the first adapter 2 to both sides of the protective shell 1. The flange 3 is fitted onto one end of both the first adapter 2 and the second adapter 26. The flange 3 connects the first adapter 2 and the second adapter 26, providing a standardized connection interface for the power output ends on both sides of the protective shell 1.

[0023] Furthermore, the front connecting shaft 4 and the rear connecting shaft 22 are simultaneously connected to the first adapter 2 and the second adapter 26. Through the setting of the front connecting shaft 4, the power transmitted by the front connecting gear 8 is received, which drives the first disc gear 5, the front output gear 6, and the second disc gear 7 to rotate synchronously, realizing the branching output of power. The connection design of its two ends with the first adapter 2 can stably transmit power to external equipment. At the same time, the rigid structure of the shaft can withstand a large torque, avoid shaft deformation under high-speed rotation or heavy load conditions, and ensure the operational stability of the front drive system.

[0024] Furthermore, a front output gear 6 is sleeved on the outer side of the front connecting shaft 4. A second disc gear 7 is welded to one end of the front output gear 6. One end of the second disc gear 7 is meshed with the front connecting gear 8. Through the setting of the second disc gear 7, the horizontal rotational power of the front connecting gear 8 is converted into the vertical power of the front output gear 6, realizing the precise adjustment of the power transmission direction. The meshing tooth profile of the first disc gear 5 and the front output gear 6 is reasonably designed, with high transmission efficiency, which can reduce energy loss in the power transmission process. At the same time, the meshing clearance between the first disc gear 5 and the front output gear 6 is controllable, avoiding abnormal transmission noise and component wear.

[0025] Furthermore, the front connecting shaft 4 and the rear output gear 25 are simultaneously provided with the front connecting shaft 4, the first disc gear 5, the front output gear 6, the second disc gear 7, the rear connecting shaft 22, the third disc gear 23, the fourth disc gear 24, the rear output gear 25, and the second adapter 26. Through the setting of the front output gear 6, it rotates under the drive of the second disc gear 7, and transmits power to the subsequent transmission structure.

[0026] Furthermore, a limiting ring 9 is welded to one end of the front connecting gear 8, and an insert block 12 is welded to one side of the first driven gear 11. An insert groove 13 is opened at one end of the front connecting gear 8. The insert block 12 and the insert groove 13 are arranged in six groups in a circular and equally spaced array at both ends of the front connecting gear 8 and the first driven gear 11. By setting the limiting ring 9 and fitting it on one end of the front connecting gear 8, the axial sliding stroke of the first driven gear 11 can be limited, preventing it from moving excessively and causing the insert block 12 and the insert groove 13 to disengage or engage too deeply, resulting in component jamming.

[0027] Furthermore, the front connecting gear 8 and the first driven gear 11, as well as the rear connecting gear 19 and the second driven gear 20, are both provided with an insert block 12 and an insert groove 13. Through the setting of the insert groove 13, it cooperates with the insert block 12 of the first driven gear 11 to form a precise clutch structure between the gears. The six sets of circularly arrayed insert grooves 13 can form multi-point meshing with the insert block 12, which improves the stability of power transmission and avoids stress concentration caused by single-point meshing.

[0028] Furthermore, the spline shaft 10 connects to the first driven gear 11 to form a sliding structure. Through the setting of the spline shaft 10, the spline structure can ensure that the first driven gear 11 always maintains a meshing state with the main drive gear 15 during axial sliding, while transmitting rotational torque. Its high guiding accuracy can limit the first driven gear 11 to move only along the axial direction, avoid gear meshing failure caused by radial offset, and ensure the precise controllability of clutch action.

[0029] Furthermore, a protective pad 18 is attached to the inner side of the front plug 14, and a driver 16 is connected to one end of the front plug 14. The driver 16 is connected to the inner side of the protective shell 1, and the driver 16 is connected to the outer side of both the front plug 14 and the rear plug 21. Through the setting of the driver 16, the driving force is output to drive the plugging and unplugging components to move, thereby controlling the axial sliding of the first driven gear 11 and the second driven gear 20, realizing the power clutch of the front and rear drive systems.

[0030] Furthermore, a connecting pipe 27 is connected through the outer side of the protective shell 1, and a filter screen 28 is sleeved on the inner side of the connecting pipe 27. A protective cover 29 is threadedly connected to the outer side of the connecting pipe 27, and a handle 30 is welded on the top of the protective cover 29. Through the setting of the filter screen 28, which is installed inside the connecting pipe 27, dust, debris and other impurities in the air entering the protective shell 1 can be filtered to prevent impurities from entering the meshing surface or bearing part, causing component wear and jamming.

[0031] Working principle: First, the transmission system inside the protective shell 1 starts operating. Then, the main drive gear 15, as the core power output unit, begins to rotate during system operation. The power output by the main drive gear 15 is guided to the various transmission structures inside the transfer case. Next, the power output by the main drive gear 15 is first transmitted to the first driven gear 11. Under the guidance of the spline shaft 10, the first driven gear 11 is in a controllable axial sliding state. When the first driven gear 11 undergoes axial displacement under driving conditions, the insert block 12 and the insert groove 13 on the front connecting gear 8 enter a mating state, so that the power output by the main drive gear 15 is stably transmitted to the front connecting gear 8. At the same time, under the constraint of the limit ring 9, it is ensured that the meshing process will not deviate. Then, after receiving power, the front connecting gear 8 drives the second disc gear 7, the front output gear 6, and the first disc gear 5 to participate in the transmission synchronously, so that the power is transmitted along the direction of the front connecting shaft 4 and output to the first adapter 2 through the front connecting shaft 4. Then, under the control of the driver 16, the front plug-in 14 can be adjusted as needed. To enter or exit the working state, the protective pad 18 acts as a buffer to achieve smooth engagement and disengagement of the front drive system, avoiding transmission damage caused by rigid impact. Then, another part of the power output from the main drive gear 15 is transmitted to the rear connecting gear 19 via the gear chain 17. Under the control of the second driven gear 20 and the rear pull-out 21, the power entering the rear connecting shaft 22 is selectively controlled, thereby realizing the independent engagement or disengagement of the rear drive system. When the rear drive system is engaged, the rear connecting shaft 22 begins to rotate, and sequentially drives the third disc gear 23 and the fourth disc gear 24, so that the power is transmitted in a balanced manner in the rear drive area. Finally, the rear output gear 25 completes the power output, and transmits it to the external rear drive system via the second adapter 26. During the long-term operation of the transfer case, the connecting pipe 27 is used for gas exchange inside the protective shell 1, the filter screen 28 filters the air entering the protective shell 1, the protective cover 29 protects the connecting pipe 27, and the handle 30 facilitates inspection and maintenance, thereby ensuring the continuous and stable operation of the transfer case.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transfer case with independent front and rear drive separation, comprising a protective housing (1), characterized in that: A first adapter (2) is provided on the outer side of the protective shell (1). One end of the first adapter (2) is connected to a front connecting shaft (4). A front connecting gear (8) is connected to the outer side of the front connecting shaft (4). A spline shaft (10) is provided on one side of the front connecting gear (8). A first driven gear (11) is meshed on the outer side of the spline shaft (10). A front pull-out insert (14) is fitted on the outer side of the first driven gear (11). A main drive gear (15) is meshed on the outer side of the first driven gear (11). The front connecting gear... A toothed chain (17) is fitted on the outer side of the wheel (8), and a rear connecting gear (19) is fitted on the inner side of the toothed chain (17). A rear connecting shaft (22) is connected through the inner side of the rear connecting gear (19). A third disc gear (23) is connected to the outer side of the rear connecting shaft (22). A fourth disc gear (24) is meshed with one end of the third disc gear (23). A rear output gear (25) is welded to one end of the fourth disc gear (24). A second adapter (26) is connected to one end of the rear connecting shaft (22).

2. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: The flange (3) is connected to the first adapter (2) on both sides of the protective shell (1). The flange (3) is fitted on one end of the first adapter (2) and the second adapter (26).

3. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: The front connecting shaft (4) and the rear connecting shaft (22) are connected to the first adapter (2) and the second adapter (26) at both ends.

4. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: A front output gear (6) is sleeved on the outer side of the front connecting shaft (4). A second disc gear (7) is welded to one end of the front output gear (6), and a front connecting gear (8) is meshed to one end of the second disc gear (7).

5. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: The front connecting shaft (4) and the rear output gear (25) are equipped with a front connecting shaft (4), a first disc gear (5), a front output gear (6), a second disc gear (7), a rear connecting shaft (22), a third disc gear (23), a fourth disc gear (24), a rear output gear (25), and a second adapter (26) at both ends.

6. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: A limiting ring (9) is welded to one end of the front connecting gear (8), and an insert block (12) is welded to one side of the first driven gear (11). An insert groove (13) is opened at one end of the front connecting gear (8). The insert block (12) and the insert groove (13) are arranged in six groups in a circular, equally spaced array at both ends of the front connecting gear (8) and the first driven gear (11).

7. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: The front connecting gear (8) and the first driven gear (11), as well as the rear connecting gear (19) and the second driven gear (20), are all provided with an insert block (12) and an insert groove (13).

8. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: The splined shaft (10) is connected to the first driven gear (11) to form a sliding structure.

9. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: The inner side of the front plug (14) is fitted with a protective pad (18), and one end of the front plug (14) is connected to a driver (16). The driver (16) is connected to the inner side of the protective shell (1), and the front plug (14) and the outer side of the rear plug (21) are both connected to the driver (16).

10. A transfer case with independent front and rear drive separation according to claim 1, characterized in that: A connecting pipe (27) is connected through the outer side of the protective shell (1). A filter screen (28) is sleeved on the inner side of the connecting pipe (27). A protective cover (29) is threaded on the outer side of the connecting pipe (27). A handle (30) is welded on the top of the protective cover (29).

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