Transfer case with parking power take-off function

Abstract

According to the transfer case with the parking power take-off function, in the power take-off process, an automobile does not run, but power can be provided for a power take-off device through the transfer case, pertinence is high, the traditional mode that power take-off is conducted from a power take-off shaft is not adopted, power take-off can be conducted directly from an input shaft, and the power take-off efficiency is high. The space occupied by the transfer case shell is effectively reduced, the power take-off process is more direct, and the energy loss is small. The main structure of the power divider comprises a power divider shell, an input shaft, a front output shaft, a rear output shaft, a gear shifting guide shaft and a gear shifting rotating shaft, a speed reduction planetary gear train is arranged on the input shaft, a driven chain wheel is arranged on the front output shaft, a driving chain wheel is arranged on the rear output shaft, the driving chain wheel and the driven chain wheel are in transmission through a chain, and a power take-off gear is arranged on the input shaft. The power take-off gear, the speed reduction planetary gear train, the high and low speed shifting fork, the driving chain wheel and the two four-wheel drive shifting forks are sequentially arranged in the axial direction of the input shaft, a power take-off window is arranged on the transfer case shell, and a sealing cover is arranged on the transfer case shell.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle transmission, transfer case and power take-off, and in particular relates to a transfer case with parking power take-off function. Background Art

[0002] Installing a power take-off (PTO) on a car's transfer case is a common practice. Generally, the PTO and transfer case are assembled and matched from the outset, allowing the transfer case to remain operational while the car is in motion, while the PTO can be activated as needed to draw power from the PTO shaft (or PTO gear) in the transfer case.

[0003] However, there is currently a type of application scenario, that is, the power take-off is not usually assembled with the transfer case in advance. Instead, the power take-off is selected to be assembled in combination with the transfer case in scenarios where power take-off is required. Sometimes, the power take-off device is even pre-arranged on site (such as an on-site drilling mechanism driven by a power take-off), and then the car with the transfer case is driven to the site for combined assembly. Utility Model Content

[0004] The utility model provides a transfer case with a parking power take-off function, that is, the car is not moving during the power take-off process, but power can be provided to the power take-off device through the transfer case. It is highly targeted and does not adopt the traditional method of taking power from the power take-off shaft, but can take power directly from the input shaft, effectively reducing the space required for the transfer case housing, and the power take-off process is more direct, with less energy loss.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A transfer case with a parking power take-off function comprises a transfer case housing, an input shaft, a front output shaft, a rear output shaft, a shift guide shaft and a shift rotating shaft, wherein a reduction planetary gear train is provided on the input shaft, a driven sprocket is provided on the front output shaft, a driving sprocket is provided on the rear output shaft, a chain transmission is passed between the driving sprocket and the driven sprocket, a high- and low-speed combining sleeve which can cooperate with the reduction planetary gear train is provided on the rear output shaft, two four-wheel drive combining sleeves which can cooperate with the rear output shaft are provided on the driving sprocket, a high- and low-speed shift fork for driving the high- and low-speed combining sleeve and two four-wheel drive shift forks for driving the two four-wheel drive combining sleeves are provided on the shift guide shaft, a driving cam for driving the high- and low-speed shift forks and the two four-wheel drive shift forks is provided on the shift rotating shaft, the input shaft and the rear output shaft are coaxially arranged, and the input shaft, the shift guide shaft, the shift rotating shaft and the front output shaft are arranged in sequence from top to bottom;

[0007] The input shaft is provided with a power take-off gear, and the power take-off gear, the reduction planetary gear train, the high and low speed shift forks, the driving sprocket and the two four-wheel drive shift forks are arranged in sequence along the axial direction of the input shaft;

[0008] The transfer case housing is provided with a power take-off window located next to the power take-off gear. The transfer case housing is provided with a cover that can seal the power take-off window. The cover and the transfer case housing are sealed by a sealing ring and fixed to the transfer case housing by a plurality of screws.

[0009] Preferably, the input shaft has an input inner shaft hole, and a seal is provided in the input inner shaft hole. The seal divides the inner hole into an outer section hole and an inner section hole connected to the interior of the transmission housing. One end of the rear output shaft is a rear output front end extending into the inner section hole, and the other end of the rear output shaft is a rear output rear end outside the input inner shaft hole. The rear output shaft and the input shaft are rotatably matched.

[0010] Preferably, the transfer case housing is provided with a front deep groove ball bearing and a rear deep groove ball bearing, the input shaft cooperates with the front deep groove ball bearing, the rear output shaft cooperates with the rear deep groove ball bearing, the front deep groove ball bearing, the power take-off gear, the two four-wheel drive forks and the rear deep groove ball bearing are arranged in sequence along the axial direction of the input shaft, and the seal is a sealed needle roller bearing, the sealed needle roller bearing cooperates with the input inner shaft hole, and the rear output shaft cooperates with the sealed needle roller bearing.

[0011] Preferably, the shift shaft includes a working shaft section and an auxiliary shaft section, the driving cam is arranged on the working shaft section, the working shaft section and the auxiliary shaft section rotate in cooperation, the planetary carrier of the reduction planetary gear system is sleeved with an attached outer gear ring fixed to the planetary carrier, the shift guide shaft is provided with an intermediate gear rotatably connected to the shift guide shaft and meshing with the attached outer gear ring, the auxiliary shaft section is provided with an oil suction gear meshing with the intermediate gear, the auxiliary shaft section has an inner shift shaft hole, a sealing bowl plug is provided in the inner shift shaft hole, and the sealing bowl plug divides the inner shift shaft hole into It is divided into a rear section hole and a front section hole, an oil pumping impeller is fixed in the front section hole, a housing oil channel is provided on the transfer case housing, the housing oil channel includes a lower channel hole, a middle oil channel and an upper channel hole, one end of the upper channel hole is an oil injection outer end opening on the inner surface of the transfer case housing, the other end of the upper channel hole is an oil injection inner end, the oil injection outer end faces the power take-off gear, a plurality of oil suction holes connected to the front section hole are provided on the shift shaft, the lower channel hole, the middle oil channel and the oil injection inner end are connected in sequence, one end of the shift shaft is rotatably sealed with the lower channel hole, and the front section hole is connected to the lower channel hole.

[0012] Preferably, the lowest point of the power take-off gear is at a higher height than the highest point of the upper hole, the power take-off gear, the outer end of the oil injection and the inner end of the oil injection are arranged in sequence along the axial direction of the input shaft, and the axis of the upper hole intersects with both end faces of the power take-off gear.

[0013] The beneficial effects of the present invention are as follows: during the power take-off process, the car does not move, but power can be provided to the power take-off device through the transfer case, which is highly targeted and does not adopt the traditional method of taking power from the power take-off shaft, but can directly take power from the input shaft, effectively reducing the space required to be occupied by the transfer case housing, and the power take-off process is more direct with less energy loss; when taking power, oil can be automatically supplied to the power take-off gear to ensure lubrication and heat dissipation effects, and normally, the oil supply can be increased for the reduction planetary gear system that is prone to heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 yes Figure 1 Enlarged view of point B in the middle;

[0017] Figure 4 yes Figure 1 Enlarged view of point C in the middle;

[0018] Figure 5 It is a partial structural diagram of the utility model.

[0019] Reference numerals: transfer case 1, power take-off window 1a, lower channel hole 1b, middle oil channel 1c, upper channel hole 1d, front deep groove ball bearing 1.1, rear deep groove ball bearing 1.2, input shaft 2, outer section hole 2a, inner section hole 2b, seal 2.1, reduction planetary gear train 201, power take-off gear 202, intermediate gear 203, oil suction gear 204, front output shaft 3, rear output shaft 4, shift guide shaft 501, shift Rotating shaft 502, rear section hole 502a, front section hole 502b, oil suction hole 502c, working shaft section 502.1, auxiliary shaft section 502.2, sealing bowl plug 502.3, oil pumping impeller 502.4, high-low speed coupling sleeve 503, two four-wheel drive coupling sleeves 504, high-low speed shift fork 505, two four-wheel drive shift forks 506, driving cam 507, driven sprocket 601, driving sprocket 602, chain 603. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0021] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown,

[0022] A transfer case with a parking power take-off function includes a transfer case housing 1, an input shaft 2, a front output shaft 3, a rear output shaft 4, a shift guide shaft 501, and a shift rotating shaft 502. The input shaft 2 is provided with a reduction planetary gear train 201, the front output shaft 3 is provided with a driven sprocket 601, the rear output shaft 4 is provided with a driving sprocket 602, the driving sprocket 602 and the driven sprocket 601 are driven by a chain 603, the rear output shaft 4 is provided with a high-low speed coupling sleeve 503 that can cooperate with the reduction planetary gear train 201, the driving sprocket 602 is provided with a high-low speed coupling sleeve 503 that can cooperate with the high-low speed coupling sleeve 503, and the driving sprocket 602 is provided with a high-low speed coupling sleeve 503. 02 is provided with two four-wheel drive coupling sleeves 504 that can cooperate with the rear output shaft 4, the shift guide shaft 501 is provided with high and low speed forks 505 for driving the high and low speed coupling sleeves 503 and two four-wheel drive forks 506 for driving the two four-wheel drive coupling sleeves 504, and the shift shaft 502 is provided with a driving cam 507 for driving the high and low speed forks 505 and the two four-wheel drive forks 506. The input shaft 2 is coaxially arranged with the rear output shaft 4. The input shaft 2, the shift guide shaft 501, the shift shaft 502 and the front output shaft 3 are arranged in order from top to bottom;

[0023] The above parts are all existing technologies in the field of transfer cases. Further additions are as follows: when the two four-wheel drive forks 506 drive the two four-wheel drive coupling sleeves 504 to move, so that the two four-wheel drive coupling sleeves 504 are matched with both the driving sprocket 602 and the rear output shaft 4, a portion of the power on the rear output shaft 4 can be transmitted to the front output shaft 3 through the driving sprocket 602, the chain 603, and the driven sprocket 601, thereby realizing the "four-wheel drive function". When the two four-wheel drive coupling sleeves 504 are not matched with the rear output shaft 4, the "two-wheel drive function" is realized.

[0024] When the high-low speed shift fork 505 drives the high-low speed coupling sleeve 503 to cooperate with both the rear output shaft 4 and the high-speed structure in the reduction planetary gear train 201, the "high-speed function" can be realized. When the high-low speed shift fork 505 drives the high-low speed coupling sleeve 503 to cooperate with both the rear output shaft 4 and the low-speed structure in the reduction planetary gear train 201, the "low-speed function" can be realized. When the high-low speed coupling sleeve 503 does not cooperate with the rear output shaft 4, it is "neutral gear".

[0025] To sum up, combining the "four-wheel drive function" with the "high-speed function" is the four-wheel drive high-speed gear, combining the "four-wheel drive function" with the "low-speed function" is the four-wheel drive low-speed gear, combining the "two-wheel drive function" with the "high-speed function" is the two-wheel drive high-speed gear. In addition, there is a neutral gear.

[0026] The high and low speed shift forks 505 are slidably connected to the shift guide shaft 501 , and the two four-wheel drive shift forks 506 are slidably connected to the shift guide shaft 501 .

[0027] Driving each shift fork by driving cam 507 is also a prior art. Guide grooves cooperating with each shift fork can be set on the circumference of driving cam 507 according to needs. When driving cam 507 rotates, each shift fork moves relative to each other along the cooperating guide groove, so that the shift fork can move axially along the shift guide shaft 501. In practice, it can be set according to specific needs and is not absolutely limited here.

[0028] The input shaft 2 is provided with a power take-off gear 202, and the power take-off gear 202, the reduction planetary gear train 201, the high and low speed shift forks 505, the driving sprocket 602 and the two four-wheel drive shift forks 506 are arranged in sequence along the axial direction of the input shaft 2;

[0029] The transfer case housing 1 is provided with a power take-off window 1a located next to the power take-off gear 202. The transfer case housing 1 is provided with a cover that can seal the power take-off window 1a. The cover and the transfer case housing 1 are sealed by a sealing ring and fixed to the transfer case housing 1 by a plurality of screws.

[0030] When configuring a power take-off on a conventional transfer case, an independent power take-off shaft needs to be arranged at the transfer case housing 1, and a power take-off gear 202 needs to be provided on the power take-off shaft (the power take-off gear 202 is rotationally connected to the power take-off shaft, and the power take-off takes power through the power take-off gear 202). The power take-off gear 202 should be directly or indirectly engaged (or linked) with another gear in the transfer case housing 1. In addition, a power take-off coupling sleeve needs to be arranged on the power take-off shaft, and a power take-off fork for driving the power take-off coupling sleeve is configured. When power take-off is required, the power take-off coupling sleeve cooperates with both the power take-off shaft and the power take-off gear 202, so that power can be transmitted to the power take-off gear 202 through the power take-off shaft and the power take-off coupling sleeve, and then the power is transmitted to the power take-off.

[0031] In the present invention, however, the independent, bulky power take-off shaft structure (and its corresponding bulky auxiliary structures, such as the power take-off coupling sleeve and power take-off fork) is directly eliminated, effectively reducing the space required by the transfer case housing 1 and simplifying the layout difficulty in the compact vehicle engine compartment. (The emphasis on "independent" is because if gears and other structures are added to the existing shaft, there is likely sufficient internal space, so the impact on the space required by the transfer case housing 1 is relatively small. However, independent structures such as the power take-off shaft will inevitably significantly increase the local width and height of the transfer case housing 1.) In addition, the power take-off gear 202 is directly arranged on the power input side (input shaft 2). This makes the power transmission process more direct and reduces energy loss. As for the specific arrangement, first prepare a specific power take-off (PTO) based on the transfer case (there is a PTO window on the PTO, and the gear for power take-off on the PTO is exposed outside the PTO window). When the car is in position, open the cover to expose the PTO window 1a, and allow the PTO gear 202 to mesh with the gear for power take-off in the PTO. Then, mate and seal the PTO housing with the transfer case housing 1 (that is, the PTO window 1a and the PTO window are sealed). Then, activate the input shaft 2 to drive the PTO. During the power take-off process, the car is always parked, so there is no need for a separate PTO activation mechanism. Activating the transfer case's input shaft 2 activates the PTO, and stopping the transfer case's input shaft 2 stops the PTO.

[0032] The input shaft 2 has an input inner shaft hole, and a seal 2.1 is provided in the input inner shaft hole. The seal 2.1 divides the inner hole into an outer section hole 2a and an inner section hole 2b connected to the interior of the transmission housing. One end of the rear output shaft 4 is a rear output front end extending into the inner section hole 2b, and the other end of the rear output shaft 4 is a rear output rear end located outside the input inner shaft hole. The rear output shaft 4 and the input shaft 2 are rotationally engaged with each other.

[0033] This utility model draws power directly from the input shaft 2. Compared to traditional power take-off systems with a separate power take-off shaft, the input shaft 2 is subject to greater radial impact (vibration occurs during operation). Therefore, the rotational fit between the rear output shaft 4 and the input shaft 2 effectively improves operational stability and better protects the service life of the transfer case's internal structure. Supplementary information: The presence of the input inner shaft hole allows the front end of the rear output shaft to extend into the inner section hole 2b. However, the seal 2.1 is required to prevent lubricating oil from the transfer case housing 1 from splashing out through the input inner shaft hole.

[0034] The transfer case housing 1 is provided with a front deep groove ball bearing 1.1 and a rear deep groove ball bearing 1.2. The input shaft 2 cooperates with the front deep groove ball bearing 1.1, and the rear output shaft 4 cooperates with the rear deep groove ball bearing 1.2. The front deep groove ball bearing 1.1, the power take-off gear 202, the two four-wheel drive shift forks 506 and the rear deep groove ball bearing 1.2 are arranged in sequence along the axial direction of the input shaft 2. The seal 2.1 is a sealed needle roller bearing, which cooperates with the input inner shaft hole, and the rear output shaft 4 cooperates with the sealed needle roller bearing.

[0035] As mentioned above, the power take-off will vibrate during operation, and the input shaft 2 will be subjected to greater radial impact. Furthermore, the input shaft 2 and the rear output shaft 4 are coaxially arranged, and in some cases can be considered a long axis, requiring higher stability. The present invention utilizes a front deep groove ball bearing 1.1 and a rear deep groove ball bearing 1.2 at opposite ends, and a sealed needle roller bearing is arranged somewhere in the middle, which is used for both sealing and improving support capacity. This further enhances the stability of the input shaft 2, rear output shaft 4, power take-off gear 202, and other structures during operation, ensuring their service life. Note: Sealed needle roller bearings are a type of prior art, and their main feature is that they are sealed at one end.

[0036] The shift shaft 502 includes a working shaft section 502.1 and an auxiliary shaft section 502.2. A driving cam 507 is provided on the working shaft section 502.1. The working shaft section 502.1 and the auxiliary shaft section 502.2 are rotatably matched. The planetary carrier of the reduction planetary gear train 201 is provided with an attached outer ring gear fixed to the planetary carrier. The shift guide shaft 501 is provided with an intermediate gear 203 that is rotatably connected to the shift guide shaft 501 and meshes with the attached outer ring gear. The auxiliary shaft section 502.2 is provided with an oil suction gear 204 that meshes with the intermediate gear 203. The auxiliary shaft section 502.2 has an inner shift shaft hole. A sealing bowl plug 502.3 is provided in the inner shift shaft hole. The sealing bowl plug 502.3 seals the inner shift shaft hole. The shaft hole is divided into a rear hole 502a and a front hole 502b. An oil pumping impeller 502.4 is fixed in the front hole 502b. A housing oil channel is provided on the transfer case housing 1. The housing oil channel includes a lower hole 1b, a middle oil channel 1c and an upper hole 1d. One end of the upper hole 1d is an oil injection outer end opening on the inner surface of the transfer case housing 1, and the other end of the upper hole 1d is an oil injection inner end. The oil injection outer end faces the power take-off gear 202. A plurality of oil suction holes 502c connected to the front hole 502b are provided on the shift shaft 502. The lower hole 1b, the middle oil channel 1c and the oil injection inner end are connected in sequence. One end of the shift shaft 502 is rotatably sealed with the lower hole 1b, and the front hole 502b is connected to the lower hole 1b.

[0037] As previously stated, "the input shaft 2, shift guide shaft 501, shift shaft 502, and front output shaft 3 are arranged sequentially from top to bottom." This also belongs to the prior art in the transfer case field. Because of the need to consider coordination with the transmission and smooth and reasonable arrangement within the engine compartment, the input shaft 2 is typically located at a relatively high position. The amount of lubricating oil within the transfer case housing 1 generally accounts for 30% to 40% of the internal height of the transfer case housing 1 (too much lubricating oil will increase operating resistance and energy loss). The upper structures within the transfer case housing 1 rely on upwardly splashing lubricating oil for lubrication and heat dissipation. Gears and other structures within the lower portion of the transfer case housing 1 (such as the driven sprocket 601 in the present invention) push the lubricating oil upward during operation, allowing the oil to splash upward.

[0038] The present invention takes power directly from the input shaft 2 and the power take-off gear 202. However, the amount of lubricating oil that can be received by the input shaft 2 and the power take-off gear 202 is limited. Therefore, the continuous working capacity of the power take-off is very limited and it is prone to overheating. In the traditional mode, to solve this kind of problem, it is necessary to arrange an external oil pump and set an oil suction pipe that penetrates into the transfer case housing 1. The oil is pumped out using the oil pump and the oil suction pipe, and an oil spray pipe is arranged that penetrates into the transfer case housing 1 to spray the lubricating oil to the position that needs to be lubricated and dissipated. Doing so is costly and also requires taking up additional space in the engine compartment, increasing the difficulty of laying out the various structures such as the transfer case. In this solution, the shift shaft 502, which is in a relatively low position (the shift shaft 502 is located relatively low and can be immersed in the lubricating oil), is directly utilized. When continuous power take-off is required, the power take-off gear 202 rotates, driving the attached outer ring gear, the intermediate gear 203, the oil pumping gear, the auxiliary shaft section 502.2, and the oil pumping impeller 502.4 to rotate continuously, so that the lubricating oil can reach the upper hole 1d along the oil suction hole 502c, the front section hole 502b, the lower hole 1b, and the middle oil channel 1c, and is sprayed onto the power take-off gear 202 from the outer end of the oil spray, so that the power take-off gear 202 can be fully lubricated and heat dissipated.

[0039] The lowest point of the power take-off gear 202 is at a height higher than the highest point of the upper hole 1d. The power take-off gear 202, the outer end of the oil injection and the inner end of the oil injection are arranged in sequence along the axial direction of the input shaft 2. The axis of the upper hole 1d intersects with both end faces of the power take-off gear 202.

[0040] When no power is taken but the car is moving, the amount of lubricating oil required at the reduction planetary gear system 201 is also relatively large (similar to the power take-off gear 202, the reduction planetary gear system 201 is also at a relatively high position and often bears a large force. It is easy to suffer from insufficient lubrication and overheating if it only relies on the splashing lubricating oil to dissipate heat). When no power is taken, the power take-off gear 202 is subjected to little force and generates very little heat. The lubricating oil sprayed from the outer end of the oil sprayer onto the power take-off gear 202 is a bit of a waste. In this solution, after being set to the mode of "the power take-off gear 202, the outer end of the oil injection and the inner end of the oil injection are arranged in sequence along the axial direction of the input shaft 2, and the axis of the upper hole 1d intersects with the two end faces of the power take-off gear 202", most of the sprayed lubricating oil can be sprayed onto the side of the power take-off gear 202 (the end face adjacent to the reduction planetary gear system 201). In this way, part of the lubricating oil that contacts the side of the power take-off gear 202 will splash back and fall onto the reduction planetary gear system 201 on the side. Therefore, regardless of whether power is taken off or not, the lubricating oil sprayed from the outer end of the oil injection can achieve a better lubrication effect for the structure that needs lubrication.

[0041] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

The transmission is connected to the transmission shaft by a chain, and the transmission shaft is connected to the transmission shaft by a chain. The transmission shaft is connected to the transmission shaft by a chain, and the transmission shaft is connected to the transmission shaft by a chain. The transmission shaft is connected to the transmission shaft by a chain, and the transmission shaft is connected to the transmission shaft by a chain. The input shaft is provided with a power take-off gear, and the power take-off gear, the reduction planetary gear train, the high and low speed shift forks, the driving sprocket and the two four-wheel drive shift forks are arranged in sequence along the axial direction of the input shaft; The transfer case housing is provided with a power take-off window located next to the power take-off gear. The transfer case housing is provided with a cover that can seal the power take-off window. The cover and the transfer case housing are sealed by a sealing ring and fixed to the transfer case housing by a plurality of screws.

2. A transfer case with parking power take-off function according to claim 1, characterized in that: The input shaft has an input inner shaft hole, and a seal is provided in the input inner shaft hole. The seal divides the inner hole into an outer section hole and an inner section hole connected to the interior of the transmission housing. One end of the rear output shaft is a rear output front end extending into the inner section hole, and the other end of the rear output shaft is a rear output rear end outside the input inner shaft hole. The rear output shaft and the input shaft are rotatably matched.

3. A transfer case with parking power take-off function according to claim 2, characterized in that: The transfer case housing is provided with a front deep groove ball bearing and a rear deep groove ball bearing, the input shaft cooperates with the front deep groove ball bearing, and the rear output shaft cooperates with the rear deep groove ball bearing. The front deep groove ball bearing, the power take-off gear, the two four-wheel drive shift forks and the rear deep groove ball bearing are arranged in sequence along the axial direction of the input shaft. The seal is a sealed needle roller bearing, which cooperates with the input inner shaft hole, and the rear output shaft cooperates with the sealed needle roller bearing.

4. A transfer case with parking power take-off function according to claim 1, 2 or 3, characterized in that: The shift shaft includes a working shaft section and an auxiliary shaft section, a driving cam is arranged on the working shaft section, the working shaft section and the auxiliary shaft section rotate in cooperation, a planetary carrier of the reduction planetary gear system is sleeved with an attached outer gear ring fixed to the planetary carrier, a shift guide shaft is provided with an intermediate gear rotatably connected to the shift guide shaft and meshing with the attached outer gear ring, an auxiliary shaft section is provided with an oil suction gear meshing with the intermediate gear, the auxiliary shaft section has a shift inner shaft hole, a sealing bowl plug is provided in the shift inner shaft hole, and the sealing bowl plug divides the shift inner shaft hole into a rear The first hole and the front hole, an oil pumping impeller is fixed in the front hole, a housing oil channel is provided on the transfer case housing, the housing oil channel includes a lower hole, a middle oil channel and an upper hole, one end of the upper hole is an oil injection outer end opening on the inner surface of the transfer case housing, the other end of the upper hole is an oil injection inner end, the oil injection outer end faces the power take-off gear, a number of oil suction holes connected to the front hole are provided on the shift shaft, the lower hole, the middle oil channel and the oil injection inner end are connected in sequence, one end of the shift shaft is rotated and sealed with the lower hole, and the front hole is connected to the lower hole.

5. A transfer case with parking power take-off function according to claim 4, characterized in that: The lowest point of the power take-off gear is at a height higher than the highest point of the upper hole. The power take-off gear, the outer end of the oil injection and the inner end of the oil injection are arranged in sequence along the axial direction of the input shaft. The axis of the upper hole intersects with both end faces of the power take-off gear.

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