A chain-type power divider

Abstract

The present invention discloses a chain-type transfer case. The power take-off structure has a high degree of integration with the transmission structure. The lubricating oil inside the transmission can simultaneously provide lubrication and heat dissipation functions for the power take-off structure. Moreover, the power take-off shaft and the power take-off driven gear in the power take-off structure are reasonably arranged, and the power take-off driven gear can continuously lift the lubricating oil located at the lower part inside the transmission housing upward, so as to provide lubricating oil for the structure above the transmission housing. The main structures of this application include a transfer case housing, an input shaft, a rear output shaft, a front output shaft, a power take-off shaft, an input gear hub, a shift gear sleeve, a driving sprocket, a driven sprocket, a transmission chain, a sprocket gear hub, a rear output gear hub, a rear output engagement gear hub, two four-wheel drive engagement gear sleeves, a power take-off driven gear, a shift fork and two four-wheel drive forks. A power take-off driving gear is fixed on the rear output shaft, and the power take-off shaft passes through the transmission chain. It also includes a sun gear, a planet carrier, a ring gear and several gear shafts, and planet gears rotatably connected to the gear shafts are arranged on the gear shafts.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle transmission and transfer case, and particularly relates to a chain-type transfer case. Background Art

[0002] A transfer case is a gear transmission system, which is a common structure on multi-axle drive vehicles. It usually has gears such as two-wheel drive high-speed gear, four-wheel drive high-speed gear, neutral gear, and four-wheel drive low-speed gear. A power take-off is also a common power transmission structure, which can usually be connected to a transmission or a transfer case to output power to an external working device, such as a lifting pump. Whether it is a transfer case or a power take-off, lubricating oil is required for lubrication and heat dissipation to ensure smooth operation.

[0003] Supplementary description: In the prior art, for some conventional transfer cases, the height of the lubricating oil level inside is about 30% of the height of its internal space (which can be adjusted according to different vehicle models, requirements, etc.). If there is too much lubricating oil, it will cause too many movable structures (gears, sprockets, coupling sleeves, etc.) to be immersed (partial immersion or full immersion is counted) in the lubricating oil, resulting in too much resistance during the operation of the transmission, thus causing excessive energy loss and low power transmission efficiency. If there is too little lubricating oil, it will cause insufficient lubrication and heat dissipation inside the transmission, affecting the service life of the transmission. Summary of the Invention

[0004] The present invention provides a chain-type transfer case, which has gears such as two-wheel drive high-speed gear, four-wheel drive high-speed gear, neutral gear, and four-wheel drive low-speed gear, and is equipped with a power take-off structure for power take-off. The integration degree of the power take-off structure and the transmission structure is high. The lubricating oil inside the transmission can simultaneously provide lubrication and heat dissipation functions for the power take-off structure. The power take-off shaft and the power take-off driven gear in the power take-off structure are reasonably arranged. Except for the neutral gear, in the other gears, the power take-off driven gear can continuously lift the lubricating oil at the lower part inside the transmission housing upward, so as to provide lubricating oil for the structure above the transmission housing.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A chain transfer case, comprising a transfer case housing, an input shaft, a rear output shaft, a front output shaft, a power take-off shaft, an input gear hub, a shift gear sleeve, a driving sprocket, a driven sprocket, a drive chain, a sprocket gear hub, a rear output gear hub, a rear output engagement gear hub, two four-wheel drive engagement gear sleeves, a power take-off driven gear rotatably connected to the power take-off shaft, a shift fork for driving the shift gear sleeve, and two four-wheel drive forks for driving the two four-wheel drive engagement gear sleeves. The rear output shaft, the power take-off shaft, and the front output shaft are arranged in sequence from high to low. The axes of the rear output shaft, the power take-off shaft, and the front output shaft are in the same axial plane, and the included angle between the axial plane and the horizontal plane is 35 to 48 degrees. The power take-off shaft is provided with a front bearing cooperating with the transfer case housing and a rear bearing cooperating with the transfer case housing. The height of the internal space of the transfer case housing is L;

[0007] A power take-off driving gear meshing with the power take-off driven gear is fixed on the rear output shaft. The power take-off shaft passes through the drive chain. The vertical distance between the lowest point of the power take-off driven gear and the inner bottom of the transfer case housing is Q, and Q < 0.3L. A driven gear hub is fixed on the power take-off driven gear. A power take-off gear hub is provided on the power take-off shaft. The power take-off shaft further includes a power take-off gear sleeve slidably connected to the power take-off gear hub and a power take-off fork for driving the power take-off gear sleeve. The power take-off gear sleeve is adapted to the driven gear hub;

[0008] The chain transfer case further includes a sun gear driven by the input shaft, a planet carrier sleeved outside the sun gear, a ring gear provided in the transfer case housing, and a plurality of gear shafts provided on the planet carrier. Planetary gears rotatably connected to the gear shafts are provided on the gear shafts. The planetary gears mesh with the sun gear, and the planetary gears mesh with the ring gear. A planetary gear hub adapted to the shift gear sleeve is provided on the planet carrier.

[0009] Preferably, the input end of the input shaft and the output end of the rear output shaft are located on opposite sides of the transfer case housing, the input end of the input shaft and the output end of the front output shaft are on the same side of the transfer case housing, and the output end of the rear output shaft and the output end of the power take-off shaft are on the same side of the transfer case housing.

[0010] Preferably, a power take-off guide shaft relatively fixed to the transfer case housing is provided in the transfer case housing. The shift fork includes a shift fork body and a shift fork head for driving the shift gear sleeve. The two four-wheel drive forks include a two four-wheel drive fork body and a two four-wheel drive fork head for driving the two four-wheel drive engagement gear sleeves. The shift fork body is slidably connected to the power take-off guide shaft, and the two four-wheel drive fork body is slidably connected to the power take-off guide shaft. The shift fork body, the shift gear sleeve, and the power take-off shaft are arranged in sequence from top to bottom. The two four-wheel drive fork body, the two four-wheel drive engagement gear sleeves, and the power take-off shaft are arranged in sequence from top to bottom.

[0011] Preferably, the two four-wheel drive combined gear sleeves include a combined sleeve outer body driven by two four-wheel drive shift forks and having an open end at one end, a compression spring disposed inside the combined sleeve outer body, a combined sleeve inner body slidably connected to the combined sleeve outer body, and a limit retaining ring for preventing the combined sleeve inner body from detaching from the combined sleeve outer body. The combined sleeve outer body is slidably connected to the sprocket hub, the combined sleeve inner body is slidably connected to the sprocket hub, the combined sleeve inner body is adapted to the rear output combined gear hub, the compression spring is sleeved outside the sprocket hub, one end of the compression spring is relatively fixed to the combined sleeve outer body, the other end of the compression spring is relatively fixed to the combined sleeve inner body, and the compression spring, the limit retaining ring, and the open end of the combined sleeve outer body are arranged in sequence along the axial direction of the rear output shaft.

[0012] Preferably, the input shaft, the power take-off gear sleeve, the power take-off driven gear, the transmission chain, and the two four-wheel drive combined gear sleeves are arranged in sequence along the axial direction of the input shaft, and the shift gear sleeve, the power take-off driving gear, the transmission chain, and the two four-wheel drive combined gear sleeves are arranged in sequence along the axial direction of the input shaft.

[0013] Preferably, a concave oil groove with an opening downward is provided at the top inside the transfer case housing. The opening of the concave oil groove is directly above the power take-off driving gear. The top inside the transfer case housing has an extended inclined surface. In the axial direction of the input shaft: one end of the extended inclined surface is butted against the notch of the concave oil groove, and the other end of the extended inclined surface extends above the shift gear sleeve.

[0014] Preferably, a lightweight oil-scooping gear is coaxially fixed on the power take-off shaft. The vertical distance between the lowest point of the lightweight oil-scooping gear and the bottom inside the transfer case housing is P, and P < 0.3L. The power take-off driven gear, the transmission chain, and the lightweight oil-scooping gear are arranged in sequence along the axial direction of the rear output shaft.

[0015] Preferably, an axial oil passage with an open end at one end is provided on the power take-off shaft. An oil suction impeller is coaxially fixed inside the axial oil passage. An edge shell oil passage is provided on the transfer case housing. One end of the edge shell oil passage is a spraying end facing the opening of the axial oil passage, and the other end of the edge shell oil passage is a spraying end facing the gear ring. The distance between the spraying end and the axial oil passage is 1 to 5 mm. The spraying end is located below the gear ring. A through hole aligned with the spraying end is provided on the gear ring. A plurality of oil suction holes are provided on the lightweight oil-scooping gear. One end of each oil suction hole is an oil hole suction end, and the other end of each oil suction hole is an oil hole oil inlet end communicating with the axial oil passage. When an oil hole suction end rotates to the lowest position: the vertical distance between the highest point of the oil hole suction end and the bottom inside the transfer case housing is M, and M < 0.3L.

[0016] Preferably, the lightweight oil-scooping gear is provided with an annular groove opening on one end face of the lightweight oil-scooping gear. One groove side wall of the annular groove is an inner groove wall, and the other groove side wall of the annular groove is an outer groove wall sleeved outside the inner groove wall. The suction end opens on the inner groove wall and communicates with the annular groove. A sliding ring slidably and sealingly matched with the inner groove wall is provided on the two four-wheel drive shift forks. A notch is provided at the lower part of the sliding ring;

[0017] When each oil suction end is sealed by the slip ring: the two four-wheel drive combined gear sleeves are separated from the rear output combined gear hub;

[0018] After the two four-wheel drive combined gear sleeves are combined with the rear output combined gear hub: the oil suction end located below the power take-off shaft communicates with the notch, and the remaining oil suction ends are sealed by the slip ring.

[0019] Preferably, the transfer case housing has an opposed shaft surface, the injection end is located on the opposed shaft surface, the space between the opposed shaft surface and the power take-off shaft is the oil overflow gap, an oil retaining ring groove coaxial with the front bearing is provided on the inner wall of the transfer case housing, the oil retaining ring groove opens to the opposed shaft surface, the notch of the oil retaining ring groove faces the front bearing, and the distance between the notch of the oil retaining ring groove and the front bearing is 1-6 mm.

[0020] The beneficial effects of the present invention are as follows: it has gears such as two-wheel drive high speed gear, four-wheel drive high speed gear, neutral gear and four-wheel drive high speed gear, and has a power take-off structure for power take-off. The power take-off structure has a high degree of integration with the transmission structure. The lubricating oil inside the transmission can simultaneously provide lubrication and heat dissipation effects for the power take-off structure. The power take-off shaft and the power take-off driven gear in the power take-off structure are reasonably arranged. Except for the neutral gear, in the remaining gears, the power take-off driven gear can continuously lift the lubricating oil located in the lower part inside the transmission housing upward, so as to provide lubricating oil for the structure above the transmission housing; when the power take-off function is started, the oil pumping ability and the ability to make the lubricating oil splash upward can be improved, so that the components above the transfer case housing can be better lubricated and cooled; when the load of each transmission structure inside the transfer case is very high, the oil suction function, the air intake shielding function and the oil injection function can be automatically started, and the sprayed lubricating oil can pass through the through holes on the gear ring and reach each planetary gear and the inside of the gear ring, so as to lubricate and cool the inside of the planetary gear train structure extremely sufficiently. Then, the lubricating oil can splash out horizontally and continue to lubricate and cool the nearby structures. Finally, the lubricating oil falls back to the lower part inside the transfer case housing. Description of the Drawings

[0021] Figure 1 is the structural schematic diagram of the present invention;

[0022] Figure 2 is the structural schematic diagram of the present invention from another perspective;

[0023] Figure 3 is Figure 1 the enlarged view of A in

[0024] Figure 4 is Figure 1 the enlarged view of B in

[0025] Figure 5 is Figure 2 the enlarged view of C in

[0026] Figure 6It is a schematic structural diagram of Embodiment 2 of the present invention;

[0027] Figure 7 It is Figure 6 an enlarged view of the position D in

[0028] Figure 8 It is Figure 6 an enlarged view of the position E in

[0029] Figure 9 It is Figure 6 an enlarged view of the position F in

[0030] Figure 10 It is a schematic structural diagram of the slip ring in Embodiment 2 of the present invention.

[0031] Reference numerals: transfer case housing 1, concave oil groove 1a, extended inclined surface 1b, side housing oil passage 1c, opposed shaft surface 1d, oil retaining ring groove 1e, shift gear sleeve 101, two four-wheel drive combined gear sleeves 102, combined sleeve outer body 102.1, compression spring 102.2, combined sleeve inner body 102.3, limit retaining ring 102.4, shift fork 103, shift fork body 103.1, shift fork head 103.2, two four-wheel drive shift forks 104, two four-wheel drive fork body 104.1, two four-wheel drive fork head 104.2, power take-off gear sleeve 105, power take-off guide shaft 106, input shaft 2, input gear hub 2.1, rear output shaft 3, rear output gear hub 3.1, rear output combined gear hub 3.2, power take-off driving gear 301, front output shaft 4, driving sprocket 401, sprocket gear hub 401.1, driven sprocket 402, transmission chain 403, power take-off shaft 5, shaft oil passage 5a, power take-off gear hub 5.1, power take-off driven gear 501, driven gear hub 501.1, lightweight oil deflector gear 502, oil suction hole 502a, wheel ring groove 502b, slip ring 503, notch 503a, oil suction impeller 504, front end bearing 601, rear end bearing 602, sun gear 701, planet carrier 702, planet gear hub 702.1, ring gear 703, through hole 703a, gear shaft 704, planet gear 705. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] As Figure 1 , Figure 2 , Figure 3 , Figure 4 ,Figure 5 As shown

[0035] A chain transfer case, comprising a transfer case housing 1, an input shaft 2, a rear output shaft 3, a front output shaft 4, a power take-off shaft 5, an input gear hub 2.1, a shift sleeve 101, a driving sprocket 401, a driven sprocket 402, a transmission chain 403, a sprocket gear hub 401.1, a rear output gear hub 3.1, a rear output engagement gear hub 3.2, two four-wheel drive engagement sleeves 102, a power take-off driven gear 501 rotatably connected to the power take-off shaft 5, a shift fork 103 for driving the shift sleeve 101, and two four-wheel drive forks 104 for driving the two four-wheel drive engagement sleeves 102. The rear output shaft 3, the power take-off shaft 5, and the front output shaft 4 are arranged in order from high to low. The axes of the rear output shaft 3, the power take-off shaft 5, and the front output shaft 4 are in the same axial plane, and the included angle between the axial plane and the horizontal plane is 35 to 48 degrees. The power take-off shaft 5 is provided with a front end bearing 601 and a rear end bearing 602 that cooperate with the transfer case housing 1. The height of the internal space of the transfer case housing 1 is L;

[0036] A power take-off driving gear 301 meshing with the power take-off driven gear 501 is fixed on the rear output shaft 3. The power take-off shaft 5 passes through the transmission chain 403. The vertical distance between the lowest point of the power take-off driven gear 501 and the inner bottom of the transfer case housing 1 is Q, and Q < 0.3L. A driven gear hub 501.1 is fixed on the power take-off driven gear 501. A power take-off gear hub 5.1 is provided on the power take-off shaft 5. It further includes a power take-off sleeve 105 slidably connected to the power take-off gear hub 5.1 and a power take-off fork for driving the power take-off sleeve 105. The power take-off sleeve 105 is adapted to the driven gear hub 501.1;

[0037] It further includes a sun gear 701 driven by the input shaft 2, a planet carrier 702 sleeved outside the sun gear 701, a ring gear 703 provided inside the transfer case housing 1, and a plurality of gear shafts 704 provided on the planet carrier 702. A planet gear 705 rotatably connected to the gear shaft 704 is provided on the gear shaft 704. The planet gear 705 meshes with the sun gear 701, and the planet gear 705 meshes with the ring gear 703. A planet gear hub 702.1 adapted to the shift sleeve 101 is provided on the planet carrier 702;

[0038] Prior art supplement: The rear output shaft 3 is coaxially arranged with the input shaft 2, and the rear output shaft 3 is rotationally engaged with the input shaft 2. The input shaft 2 can rotate relative to the transfer case housing 1, the rear output shaft 3 can rotate relative to the transfer case housing 1, the front output shaft 4 can rotate relative to the transfer case housing 1. The inner ring of the front end bearing 601 is fixed to the power take-off shaft 5, and the outer ring of the front end bearing 601 is fixed to the transfer case housing 1. The inner ring of the rear end bearing 602 is fixed to the power take-off shaft 5, and the outer ring of the rear end bearing 602 is fixed to the transfer case housing 1. The front end bearing 601, the power take-off driven gear 501, the drive chain 403, and the rear end bearing 602 are arranged in sequence along the axial direction of the power take-off shaft 5. The input gear hub 2.1 is fixed on the input shaft 2, and both the rear output gear hub 3.1 and the rear output combined gear hub 3.2 are fixed on the rear output shaft 3. The shift sleeve 101 is slidably connected to the rear output gear hub 3.1, and the shift sleeve 101 is adapted to the input gear hub 2.1. The sprocket gear hub 401.1 is fixed on the driving sprocket 401. The two four-wheel drive combined sleeves 102 are slidably connected to the sprocket gear hub 401.1, and the two four-wheel drive combined sleeves 102 are adapted to the rear output combined gear hub 3.2. The driving sprocket 401 is fixed to the rear output shaft 3, and the driven sprocket 402 is fixed to the front output shaft 4. The driving sprocket 401 and the driven sprocket 402 are driven by the drive chain 403.

[0039] When in the 2H gear (two-wheel drive high gear), the shift sleeve 101 is engaged with the input gear hub 2.1, and the shift sleeve 101 is engaged with the rear output gear hub 3.1 (the shift sleeve 101 is slidably connected to the rear output gear hub 3.1), and the two four-wheel drive combined sleeves 102 are separated from the rear output combined gear hub 3.2. The power is transmitted from the input shaft 2 through the input gear hub 2.1, the shift sleeve 101, and the rear output gear hub 3.1 to the rear output shaft 3.

[0040] After switching from the 2H gear to the 4H gear (four-wheel drive high gear), the shift sleeve 101 is engaged with the input gear hub 2.1, and the shift sleeve 101 is engaged with the rear output gear hub 3.1 (the shift sleeve 101 is slidably connected to the rear output gear hub 3.1), the two four-wheel drive combined sleeves 102 are engaged with the rear output combined gear hub 3.2, and the two four-wheel drive combined sleeves 102 are engaged with the sprocket gear hub 401.1 (the two four-wheel drive combined sleeves 102 are slidably connected to the sprocket gear hub 401.1). After the power is transmitted from the input shaft 2 through the input gear hub 2.1 and the shift sleeve 101 to the rear output gear hub 3.1, there will be two power transmission routes. One is transmitted to the rear output shaft 3 through the rear output gear hub 3.1, and the other is transmitted to the front output shaft 4 through the rear output gear hub 3.1, the rear output shaft 3, the rear output combined gear hub 3.2, the two four-wheel drive combined sleeves 102, the sprocket gear hub 401.1, the driving sprocket 401, the drive chain 403, and the driven sprocket 402.

[0041] After shifting from the 4H gear to the N gear (neutral gear), the shifting sleeve 101 is disengaged from the input gear hub 2.1, and the shifting sleeve 101 is disengaged from the planetary gear hub 702.1, disconnecting the power transmission route between the input shaft 2 and the rear output shaft 3.

[0042] After shifting from the N gear to the 4L gear (four-wheel drive low gear), the shifting sleeve 101 is engaged with the planetary gear hub 702.1, and the shifting sleeve 101 is engaged with the rear output gear hub 3.1 (the shifting sleeve 101 is slidably connected to the rear output gear hub 3.1). The two four-wheel drive coupling sleeves 102 are engaged with the rear output coupling hub 3.2, and the two four-wheel drive coupling sleeves 102 are engaged with the sprocket gear hub 401.1 (the two four-wheel drive coupling sleeves 102 are slidably connected to the sprocket gear hub 401.1). After the power is transmitted from the input shaft 2 through the sun gear 701, the planetary gear 705, the gear shaft 704, the planet carrier 702, the planetary gear hub 702.1, and the shifting sleeve 101 to the rear output gear hub 3.1, there will be two power transmission routes. One is transmitted to the rear output shaft 3 through the rear output gear hub 3.1, and the other is transmitted to the front output shaft 4 through the rear output gear hub 3.1, the rear output shaft 3, the rear output coupling hub 3.2, the two four-wheel drive coupling sleeves 102, the sprocket gear hub 401.1, the driving sprocket 401, the drive chain 403, and the driven sprocket 402. Note: The planetary gear 705 revolves around the sun gear 701, and at the same time, the planetary gear 705 rotates along the axis of the gear shaft 704 (the planetary gear 705 is rotatably connected to the gear shaft 704 provided on the gear shaft 704, and the planetary gear 705 rotates along the axis of the gear shaft 704 to which the planetary gear 705 is rotatably connected).

[0043] When power take-off is required, the power take-off fork drives the power take-off sleeve 105 to move, so that the power take-off sleeve 105 is engaged with the driven gear hub 501.1. In this way, the power can be transmitted from the rear output shaft 3, the power take-off driving gear 301, the power take-off driven gear 501, the driven gear hub 501.1, and the power take-off sleeve 105 to the power take-off shaft 5, so as to transmit the power to an external working device (the external working device is driven by the power take-off shaft 5), such as a lifting pump, etc. Power take-off is possible in all gears of the present invention except the neutral gear.

[0044] In the background art, it is stated that the height of the lubricating oil level inside the transfer case usually accounts for 30% to 40% of the height of its internal space. In the present invention, Q < 0.3L (the height of the internal space of the transfer case housing 1 is L, and the vertical distance between the lowest point of the power take-off driven gear 501 and the inner bottom of the transfer case housing 1 is Q), which ensures that the power take-off driven gear 501 can dip into the lubricating oil, so that the lifted lubricating oil can splash onto the various structures above the transmission housing to provide lubrication and heat dissipation functions for them. It should be noted that the power take-off driving gear 301 is fixed on the rear output shaft 3. Therefore, except for the neutral gear, the power take-off driving gear 301 will rotate with the rear output shaft 3, and then the power take-off driven gear 501 will also be continuously driven by the power take-off driving gear 301, so as to continuously maintain the effect of lifting the lubricating oil upward. As for the neutral gear, the demand for lubrication and heat dissipation is extremely low, and it does not rely on the oil-dipping function of the power take-off driven gear 501. In addition, the driving sprocket 401, the driven sprocket 402, and the transmission chain 403 can also cooperate with each other. The driven sprocket 402 can also lift some lubricating oil upward (but due to the obstruction of the transmission chain 403, its ability to dip the oil and make the lubricating oil splash upward is much weaker than that of the power take-off driven gear 501), and the transmission chain 403 can also carry a small amount of lubricating oil to the upper part.

[0045] Furthermore, the transmission chain 403 occupies a lot of space in the height direction. For other structures, especially larger structures, consideration should be given to how to prevent interference and make full use of the space. In the present invention, the power take-off shaft 5 cleverly passes through the transmission chain 403, further improving the space utilization effect.

[0046] As Figure 1 、 Figure 2 shown, the input end of the input shaft 2 and the output end of the rear output shaft 3 are located on opposite sides of the transfer case housing 1, the input end of the input shaft 2 and the output end of the front output shaft 4 are located on the same side of the transfer case housing 1, and the output end of the rear output shaft 3 and the output end of the power take-off shaft 5 are located on the same side of the transfer case housing 1.

[0047] The transfer case is arranged in the engine compartment, where the space is extremely limited (this is why the layout and size of the transmission and transfer case need to be reasonably controlled as much as possible). In the present invention, the layout in the engine compartment is longitudinal. The input end of the input shaft 2 is docked with the output end of the transmission. The output end of the rear output shaft 3 coaxial with the input shaft 2 is naturally "on the opposite sides of the transfer case housing 1 relative to the input end of the input shaft 2". Then, the front output shaft 4 is to transmit power to the front wheels, so naturally "the input end of the input shaft 2 and the output end of the front output shaft 4 are on the same side of the transfer case housing 1". In this way, there are already two power ends arranged on this side of the input end of the input shaft 2 (the input end of the input shaft 2 and the output end of the front output shaft 4). And power ends naturally need to be configured with a series of structures such as flanges and connectors. Therefore, it is more reasonable to arrange the output end of the power take-off shaft 5 and the output end of the rear output shaft 3 on the same side (the space distribution is more balanced, or in practice, in most cases, there is only space on the side of the output end of the rear output shaft 3 outside the transfer case housing 1 to arrange the output end of the power take-off shaft 5).

[0048] As Figure 1 shown, a power take-off guide shaft 106 fixed relative to the transfer case housing 1 is provided inside the transfer case housing 1. The shift fork 103 includes a shift fork body 103.1 and a shift fork head 103.2 for driving the shift gear sleeve 101. The two four-wheel drive shift forks 104 include two four-wheel drive fork bodies 104.1 and two four-wheel drive fork heads 104.2 for driving the two four-wheel drive engagement gear sleeves 102. The shift fork body 103.1 is slidably connected to the power take-off guide shaft 106, and the two four-wheel drive fork bodies 104.1 are slidably connected to the power take-off guide shaft 106. The shift fork body 103.1, the shift gear sleeve 101, and the power take-off shaft 5 are arranged in sequence from top to bottom. The two four-wheel drive fork bodies 104.1, the two four-wheel drive engagement gear sleeves 102, and the power take-off shaft 5 are arranged in sequence from top to bottom.

[0049] The power take-off guide shaft 106 provides a guiding function for the shift fork 103 and the two four-wheel drive shift forks 104. The position of the shift fork body 103.1 is higher than the position of the shift gear sleeve 101, and the position of the two four-wheel drive fork bodies 104.1 is higher than the position of the two four-wheel drive engagement gear sleeves 102. When the shift fork 103 and the two four-wheel drive shift forks 104 move circumferentially along the power take-off guide shaft 106, they can avoid the transmission chain 403, ensuring the rationality of the overall layout (the transmission chain 403 is in a relatively central position and occupies a relatively large space. For other structures, especially larger and movable structures, both interference prevention and making full use of space according to local conditions need to be considered).

[0050] As Figure 2 、 Figure 5As shown, the two four-wheel drive combined gear sleeves 102 include a combined sleeve outer body 102.1 driven by two four-wheel drive forks 104 and open at one end, a compression spring 102.2 arranged in the combined sleeve outer body 102.1, a combined sleeve inner body 102.3 slidably connected to the combined sleeve outer body 102.1, and a limit ring 102.4 for preventing the combined sleeve inner body 102.3 from being separated from the combined sleeve outer body 102.1. The combined sleeve outer body 102.1 is slidably connected to the sprocket hub 401.1, and the combined sleeve inner body 102.3 is connected to the sprocket hub 401.1. 02.3 is slidingly connected with the sprocket hub 401.1, the inner body 102.3 of the coupling sleeve is adapted to the rear output coupling hub 3.2, the compression spring 102.2 is sleeved outside the sprocket hub 401.1, one end of the compression spring 102.2 is relatively fixed to the outer body 102.1 of the coupling sleeve, and the other end of the compression spring 102.2 is relatively fixed to the inner body 102.3 of the coupling sleeve, the compression spring 102.2, the limit ring 102.4 and the open end of the outer body 102.1 of the coupling sleeve are arranged in sequence along the axial direction of the rear output shaft 3.

[0051] When the two four-wheel drive forks 104 drive the two four-wheel drive combination gear sleeves 102 to move and combine with the rear output combination gear hub 3.2, if the teeth of the two four-wheel drive combination gear sleeves 102 fail to combine with the teeth of the rear output combination gear hub 3.2 at once, the combination sleeve inner body 102.3 will be supported by the rear output combination gear hub 3.2, compressed by the compression spring 102.2, and the combination sleeve outer body 102.1 will not be affected and will be directly driven into place by the two four-wheel drive forks 104. Afterwards, the rear output combination gear hub 3.2 continues to rotate with the rear output shaft 3, and when the rear output combination gear hub 3.2 no longer supports the combination sleeve inner body 102.3, under the action of the compression spring 102.2, the combination sleeve inner body 102.3 is pushed until it is combined with the rear output combination gear hub 3.2.

[0052] like Figure 1 As shown, the input shaft 2, the power take-off gear sleeve 105, the power take-off driven gear 501, the transmission chain 403 and the two four-wheel drive combined gear sleeves 102 are arranged in sequence along the axial direction of the input shaft 2, and the shift gear sleeve 101, the power take-off active gear 301, the transmission chain 403 and the two four-wheel drive combined gear sleeves 102 are arranged in sequence along the axial direction of the input shaft 2.

[0053] In the present invention, the transmission chain 403 will block the splashing lubricating oil to a certain extent, so a lot of the lubricating oil moved by the power take-off driven gear 501 will be blocked by the transmission chain 403. In view of this, in the present invention, the planetary gear train structure (sun gear 701, ring gear 703, planetary gear 705, planetary carrier 702, etc.) that requires more lubrication and heat dissipation is arranged on the same side of the transmission chain 403 as the power take-off driven gear 501 (the planetary gear train structure is arranged on the input shaft 2). In this way, the lubricating oil moved by the power take-off driven gear 501 can splash more and more easily onto the planetary gear train structure.

[0054] Example 2: Based on Example 1,

[0055] like Figure 6 , Figure 7 As shown, a concave oil groove 1a with an opening facing downward is provided on the top of the transfer case housing 1, and the opening of the concave oil groove 1a is located directly above the power take-off active gear 301. An extended inclined surface 1b is provided on the top of the transfer case housing 1, and in the axial direction of the input shaft 2: one end of the extended inclined surface 1b is butted against the notch of the concave oil groove 1a, and the other end of the extended inclined surface 1b extends to above the shift gear sleeve 101.

[0056] The power take-off active gear 301 will receive a portion of the lubricating oil from the power take-off driven gear 501. As the power take-off active gear 301 rotates, a portion of the lubricating oil will be thrown upward to the top of the transfer case housing 1 (naturally, some will also enter the concave oil groove 1a). In addition to directly falling back to the lower part of the transfer case housing 1, some of the lubricating oil in the concave oil groove 1a will flow along the extended inclined surface 1b to the shift gear sleeve 101 and the planetary gear train structure, which can help enhance the lubrication effect on these parts.

[0057] like Figure 6 , Figure 9 As shown, a lightweight oil shifting gear 502 is coaxially fixed on the power take-off, and the vertical distance between the lowest point of the lightweight oil shifting gear 502 and the bottom of the transfer case housing 1 is P, P<0.3L, and the power take-off driven gear 501, the transmission chain 403 and the lightweight oil shifting gear 502 are arranged in sequence along the axial direction of the rear output shaft 3.

[0058] When the power take-off shaft 5 is working, the load of each transmission structure in the transfer case increases greatly, and the increase in load means that the heat generation increases and the lubrication demand increases. In view of this, the present invention arranges a lightweight oil-push gear 502 (which can be made of common relatively "light" materials such as high-temperature resistant rubber) at a suitable position on the power take-off shaft 5. When the power take-off shaft 5 is running, the lightweight oil-push gear 502 is used to push a large amount of lubricating oil at the bottom upward, so that the lubricating oil splashes upward, so that the upper components in the transfer case housing 1 have better lubrication and heat dissipation conditions.

[0059] like Figure 6 , Figure 8As shown, an axial oil passage 5a with one end open is provided on the power take-off shaft 5. An oil suction impeller 504 is coaxially fixed in the axial oil passage 5a. A side housing oil passage 1c is provided on the transfer case housing 1. One end of the side housing oil passage 1c is a spraying end opening towards the axial oil passage 5a, and the other end of the side housing oil passage 1c is a spraying end towards the ring gear 703. The distance between the spraying end and the axial oil passage 5a is 1 to 5 mm. The spraying end is located below the ring gear 703. A through hole 703a aligned with the spraying end is provided on the ring gear 703. A plurality of oil suction holes 502a are provided on the lightweight oil deflector gear 502. One end of the oil suction hole 502a is the oil hole suction end, and the other end of the oil suction hole 502a is the oil hole inlet end communicating with the axial oil passage 5a. When an oil hole suction end rotates to the lowest position: the vertical distance between the highest point of the oil hole suction end and the inner bottom of the transfer case housing 1 is M, and M < 0.3L.

[0060] The oil hole inlet end is communicated with the axial oil passage 5a through a side axial hole provided on the power take-off shaft 5.

[0061] When the power take-off shaft 5 rotates, the oil suction impeller 504 rotates, and the oil port suction end of the oil suction hole 502a has suction. When the oil port suction end is below the lubricating oil liquid level, lubricating oil can be sucked in, otherwise air is sucked in. After the lubricating oil and air are sucked in, they enter the axial oil passage 5a, and then are sprayed into the spraying end of the side housing oil passage 1c. After passing through the side housing oil passage 1c, they are then sprayed from the spraying end towards the planetary gear train structure (the through hole 703a on the ring gear 703). In this way, the lubricating oil in the lower part can be transferred to the upper part, so that the components above the transfer case housing 1 can have better lubrication and heat dissipation conditions.

[0062] As Figure 6 、 Figure 8 、 Figure 10 shown, the lightweight oil deflector gear 502 is provided with a ring groove 502b opening on one end face of the lightweight oil deflector gear 502. One groove side wall of the ring groove 502b is the inner groove wall, and the other groove side wall of the ring groove 502b is the outer groove wall sleeved outside the inner groove wall. The suction end opens on the inner groove wall and is communicated with the ring groove 502b. Sliding rings 503502 in sliding sealing cooperation with the inner groove wall are provided on the two four-wheel drive shift forks 104. A notch 503a502a is provided at the lower part of the sliding ring 503.

[0063] When each suction end is sealed by the sliding ring 503: the two four-wheel drive engagement sleeves 102 are separated from the rear output engagement hub 3.2.

[0064] After the two four-wheel drive engagement sleeves 102 are engaged with the rear output engagement hub 3.2: the suction end located below the power take-off shaft 5 is communicated with the notch 503a, and the remaining suction ends are sealed by the sliding ring 503.

[0065] When the present invention is in the low-speed four-wheel drive gear, the output torque is very large (the low-speed four-wheel drive gear is set to output a large torque at low speed, which belongs to the prior art). At the same time, when in the low-speed four-wheel drive gear, if power take-off is to be carried out, the load on each transmission structure in the transfer case is very high (it can be said to be the most severe working condition). At this time, the forces on each gear structure are very large and the heat generation is very large (especially inside the planetary gear train structure), and more lubricating oil is required for lubrication and cooling.

[0066] When the present invention is in the low-speed four-wheel drive gear, if the power take-off shaft 5 is also rotating and working at this time, since "when the two four-wheel drive coupling sleeves 102 are combined with the rear output coupling hub 3.2: the position is lower than the oil suction end of the power take-off shaft 5 communicating with the notch 503a, and the remaining oil suction ends are sealed by the slip ring 503", so the position lower than the oil suction end of the power take-off shaft 5 (these oil suction ends communicate with the notch 503a and are not covered) can suck oil, but no more air will be inhaled at the remaining oil suction ends. After the lubricating oil is inhaled, it enters the shaft oil passage 5a, and then is sprayed into the injection end of the side housing oil passage 1c. After passing through the side housing oil passage 1c, it is then sprayed from the ejection end towards the planetary gear train structure (the through hole 703a on the ring gear 703). The planetary gears 705 and the planet carrier 702 are rotating, and the lubricating oil ejected from the ejection end can reach each planetary gear 705 and the inside of the ring gear 703 through the through hole 703a, so as to lubricate and cool the inside of the planetary gear train structure extremely sufficiently. Then the lubricating oil can splash laterally and continue to lubricate and cool the nearby structures. Finally, the lubricating oil falls back to the lower part inside the transfer case housing 1. It should also be pointed out that the iron filings generated between the planetary gear 705 and the ring gear 703 and between the planetary gear 705 and the sun gear 701 will seriously affect the service life of the planetary gear train structure. When the planetary gear train structure is working, the lubricating oil flushing into the inside of the ring gear 703 will quickly carry away the generated iron filings, thereby protecting the planetary gear train structure.

[0067] As Figure 6 、 Figure 9 shown, the power take-off driven gear 501, the transmission chain 403, the bottom of the ring groove 502b and the edge of the ring groove 502b are arranged in sequence along the axial direction of the rear output shaft 3.

[0068] As Figure 6 、 Figure 8 shown, the transfer case housing 1 has a mating shaft surface 1d1c, the injection end is on the mating shaft surface 1d, the space between the mating shaft surface 1d and the power take-off shaft 5 is an oil overflow gap. An oil retaining ring groove 1e coaxial with the front end bearing 601 is provided on the inner wall of the transfer case housing 1. The oil retaining ring groove 1e opens to the mating shaft surface 1d, the notch of the oil retaining ring groove 1e faces the front end bearing 601, and the distance between the notch of the oil retaining ring groove 1e and the front end bearing 601 is 1 - 6 mm.

[0069] The front bearing 601 and the rear bearing 602 are crucial for the working process stability of the power take-off shaft 5. The rear bearing 602 is located on the side far from the planetary gear train structure, and there is less obstruction from other nearby structures, so the rear bearing 602 is more likely to receive splashed lubricating oil. On the contrary, the front bearing 601 is located in the part adjacent to the planetary gear train structure, and there are various structures such as the power take-off gear sleeve 105 nearby, and the space is relatively narrow. The front bearing 601 is relatively less likely to receive splashed lubricating oil. Most of the lubricating oil ejected from the ejection end naturally sprays into the inside of the gear ring 703 and reaches the planetary gear 705 or the sun gear 701, etc. However, a part of the lubricating oil will also overflow along the oil overflow gap. The oil retaining ring groove 1e can accommodate more lubricating oil, making it stay near the front bearing 601 for a longer time. Moreover, the lubricating oil that enters the oil retaining ring groove 1e and then extrudes out and leaves the oil retaining ring groove 1e can enter the front bearing 601 more and better, thus ensuring the lubrication and heat dissipation effects of the front bearing 601.

[0070] The embodiments of the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A chain transfer case, comprising a transfer case housing, an input shaft, a rear output shaft, a front output shaft, a power take-off shaft, an input gear hub, a shift gear sleeve, a driving sprocket, a driven sprocket, a transmission chain, a sprocket gear hub, a rear output gear hub, a rear output combined gear hub, two four-wheel drive combined gear sleeves, a power take-off driven gear rotatably connected to the power take-off shaft, a shift fork for driving the shift gear sleeve and two four-wheel drive forks for driving the two four-wheel drive combined gear sleeves, the rear output shaft, the power take-off shaft and the front output shaft are arranged in order from high to low, the axis of the rear output shaft, the axis of the power take-off shaft and the axis of the front output shaft are in the same axis plane, the angle between the axis plane and the horizontal plane is 35 to 48 degrees, the power take-off shaft is provided with a front end bearing matched with the transfer case housing and a rear end bearing matched with the transfer case housing, and the height of the internal space of the transfer case housing is L; characterized in that, The rear output shaft is fixed with a power take-off driving gear meshing with the power take-off driven gear, the power take-off shaft passes through the transmission chain, the vertical distance between the lowest point of the power take-off driven gear and the bottom of the transfer case housing is Q, Q<0.3L, a driven gear hub is fixed on the power take-off driven gear, the power take-off shaft is provided with a power take-off hub, and also includes a power take-off gear sleeve slidably connected to the power take-off gear hub and a power take-off fork for driving the power take-off gear sleeve, and the power take-off gear sleeve is adapted to the driven gear hub; It also includes a sun gear driven by an input shaft, a planet carrier sleeved outside the sun gear, a ring gear arranged in a transfer case housing, and a plurality of gear shafts arranged on the planet carrier, the gear shafts are provided with planetary gears rotatably connected to the gear shafts, the planetary gears mesh with the sun gear, the planetary gears mesh with the ring gear, and the planet carrier is provided with a planetary gear hub adapted to the shift gear sleeve; A power take-off guide shaft fixed relatively to the transfer case housing is arranged in the transfer case housing, the shift fork comprises a shift fork body and a shift fork head for driving a shift gear sleeve, the two four-wheel drive shift forks comprise two four-wheel drive fork bodies and two four-wheel drive fork heads for driving two four-wheel drive combined gear sleeves, the shift fork body is slidably connected to the power take-off guide shaft, the two four-wheel drive fork bodies are slidably connected to the power take-off guide shaft, the shift fork body, the shift gear sleeve and the power take-off shaft are arranged in sequence from top to bottom, and the two four-wheel drive fork bodies, the two four-wheel drive combined gear sleeves and the power take-off shaft are arranged in sequence from top to bottom; The two four-wheel drive combining gear sleeves include a combining sleeve outer body driven by two four-wheel drive forks and open at one end, a compression spring arranged in the combining sleeve outer body, a combining sleeve inner body slidably connected to the combining sleeve outer body, and a limit retaining ring for preventing the combining sleeve inner body from separating from the combining sleeve outer body, the combining sleeve outer body is slidably connected to the sprocket hub, the combining sleeve inner body is slidably connected to the sprocket hub, the combining sleeve inner body is adapted to the rear output combining gear hub, the compression spring sleeve is arranged outside the sprocket hub, one end of the compression spring is relatively fixed to the combining sleeve outer body, the other end of the compression spring is relatively fixed to the combining sleeve inner body, the compression spring, the limit retaining ring and the open end of the combining sleeve outer body are arranged in sequence along the axial direction of the rear output shaft.

2. A chain transfer box according to claim 1, characterized in that: The input end of the input shaft and the output end of the rear output shaft are located on opposite sides of the transfer case housing, the input end of the input shaft and the output end of the front output shaft are located on the same side of the transfer case housing, and the output end of the rear output shaft and the output end of the power take-off shaft are located on the same side of the transfer case housing.

3. A chain transfer box according to claim 1, characterized in that: The input shaft, the power take-off gear sleeve, the power take-off driven gear, the transmission chain and the two four-wheel drive combined gear sleeves are arranged in sequence along the axial direction of the input shaft, and the shift gear sleeve, the power take-off active gear, the transmission chain and the two four-wheel drive combined gear sleeves are arranged in sequence along the axial direction of the input shaft.

4. A chain transfer box according to claim 1 or 2, characterized in that: A concave oil groove with an opening facing downward is provided at the top of the transfer case housing, and the opening of the concave oil groove is located directly above the power take-off active gear. An extended inclined surface is provided at the top of the transfer case housing, and in the axial direction of the input shaft: one end of the extended inclined surface is butted against the notch of the concave oil groove, and the other end of the extended inclined surface extends to above the shift gear sleeve.

5. A chain transfer box according to claim 1, characterized in that: A light oil shifting gear is coaxially fixed on the power take-off, and the vertical distance between the lowest point of the light oil shifting gear and the bottom of the transfer case housing is P, P < 0.3L, and the power take-off driven gear, transmission chain and light oil shifting gear are arranged in sequence along the axial direction of the rear output shaft.

6. A chain transfer box according to claim 5, characterized in that: The power take-off shaft is provided with a shaft oil passage with an opening at one end, and an oil suction impeller is coaxially fixed in the shaft oil passage. A side housing oil passage is provided on the transfer case housing, and one end of the side housing oil passage is an injection end facing the shaft oil passage opening, and the other end of the side housing oil passage is an injection end facing the gear ring. The distance between the injection end and the shaft oil passage is 1 to 5 mm, and the injection end is located below the gear ring. The gear ring is provided with a through hole aligned with the injection end. A plurality of oil suction holes are provided on the lightweight oil transfer gear, and one end of the oil suction hole is the oil hole suction end, and the other end of the oil suction hole is the oil hole oil inlet end connected to the shaft oil passage. When an oil hole suction end rotates to the lowest position: the vertical distance between the highest point of the oil hole suction end and the bottom of the transfer case housing is M, and M is less than 0.3L.

7. A chain transfer box according to claim 6, characterized in that: The lightweight oil shifting gear is provided with a wheel ring groove opening at one end face of the lightweight oil shifting gear, one groove side wall of the wheel ring groove is an inner groove wall, the other groove side wall of the wheel ring groove is an outer groove wall sleeved outside the inner groove wall, the oil suction end is opened at the inner groove wall, and the oil suction end is connected to the wheel ring groove, and the two four-wheel drive shifting forks are provided with a sliding ring that cooperates with the inner groove wall for sliding sealing, and a notch is provided at the lower part of the sliding ring; When each oil suction end is sealed by the slip ring: the two four-wheel drive combined gear sleeves are separated from the rear output combined gear hub; When the two four-wheel drive combined gear sleeves are combined with the rear output combined gear hub: the oil suction end located lower than the power take-off shaft is connected to the notch, and the other oil suction ends are sealed by the slip ring.

8. A chain transfer box according to claim 6 or 7, characterized in that: The transfer case housing has an axial surface, the injection end is located on the axial surface, the space between the axial surface and the power take-off shaft is an oil overflow gap, and an oil retaining ring groove coaxially arranged with the front end bearing is provided on the inner wall of the transfer case housing. The oil retaining ring groove opens on the axial surface, the notch of the oil retaining ring groove faces the front end bearing, and the spacing between the notch of the oil retaining ring groove and the front end bearing is 1-6mm.

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