Transfer case and engineering machinery

Abstract

The transfer case and the engineering machinery are characterized in that a case body is provided with a transfer cavity for accommodating a power structure, a power shaft is connected with the case body through a bearing, the case body is sequentially provided with an oil inlet channel, a first lubricating channel and a second lubricating channel from top to bottom, and the second lubricating channel is communicated with the oil inlet channel through the first lubricating channel; first oil outlets are formed in the two ends of the first lubricating channel, a second oil outlet of the second lubricating channel is located between the two first oil outlets in the axial direction of the power shaft, the first oil outlets correspond to the bearings, and the second oil outlets correspond to the gears. Lubricating oil can be shunted in three directions through matching of the first lubricating channel and the second lubricating channel, lubrication and heat dissipation of the gear and the bearing are achieved through shunting of the lubricating oil, and the situation that in the prior art, lubrication of a gear located in the middle cannot be guaranteed can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to a transfer case and engineering machinery. Background Art

[0002] Transfer cases are very common in the field of engineering machinery. Their principle is to distribute engine power to two or more working devices. Currently, transfer cases use splash lubrication. Under the action of oil pressure, the diverted lubricating oil falls directly along the inner wall of the case, which cannot ensure effective lubrication of the gear pairs. Moreover, the lubricating oil cannot drain after entering the bearings, and the heat generated by the bearings cannot be removed in time. As a result, the lubrication and heat dissipation of the gear pairs and bearings cannot be met, and premature wear caused by overheating is prone to occur. In addition, the splash lubrication method in the existing technology causes the internal oil of the transfer case to easily vaporize at high temperature during operation, and after condensation, it leaks oil at the breather. Utility Model Content

[0003] The main purpose of the utility model is to provide a transfer case and engineering machinery, aiming to solve the technical problem that the prior art cannot ensure effective lubrication of gears.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a transfer case, which includes: a power structure, including a power shaft and a gear installed on the power shaft, and the gear is equipped with bearings on both sides of the axial direction of the power shaft; a case body, which is provided with a transfer chamber for accommodating the power structure, and the power shaft is connected to the case body through the bearings, and the case body is provided with an oil inlet channel, a first lubrication channel and a second lubrication channel from top to bottom, and the second lubrication channel is connected to the oil inlet channel through the first lubrication channel, and both ends of the first lubrication channel are arranged at a first oil outlet, and the second oil outlet of the second lubrication channel is located between the two first oil outlets along the axial direction of the power shaft, the first oil outlet is arranged corresponding to the bearing, and the second oil outlet is arranged corresponding to the gear.

[0005] In an embodiment of the present utility model, there are multiple power structures, and the multiple power structures are arranged in sequence from top to bottom. The box body is provided with a guide structure corresponding to the power structure, and the guide structure is used to guide the lubricating oil from top to bottom, so that the lubricating oil flows from one power structure to another.

[0006] In an embodiment of the present utility model, the guide structure includes: a main drainage rib, which is arranged from the outer edge of the box body along the box width direction of the box body; an oil inlet groove, the lower end of the main drainage rib extends to the inlet of the oil inlet groove, and the outlet of the oil inlet groove is connected to the bearing cavity of the bearing; an oil drain groove, which is located below the oil inlet groove, and the inlet of the oil drain groove is connected to the outlet of the bearing cavity.

[0007] In an embodiment of the present utility model, the multiple power structures include: a top output structure, the guide structure corresponding to the top output structure is a first guide structure; two bottom output structures, the guide structure corresponding to the bottom output structure is a second guide structure; an input structure, used to output power to the top output structure and the two bottom output structures, the guide structure corresponding to the input structure is a third guide structure, and the third guide structure is provided with an oil drain groove facing the bottom output structure.

[0008] In an embodiment of the present utility model, the second flow guide structure includes two oil inlet grooves, the oil drain groove of the third flow guide structure is connected to the bearing cavity of the bottom output structure through one of the oil inlet grooves, and the inlet of the other oil inlet groove is away from the input structure.

[0009] In an embodiment of the present utility model, the third flow-guiding structure includes two oil inlet grooves, which are arranged on both sides of the power shaft of the input structure along the box width direction of the box body, and one of the oil inlet grooves is located below the oil drain groove of the first flow-guiding structure.

[0010] In an embodiment of the present utility model, the input structure further includes a connecting end cover, the bearing is connected to the housing via the connecting end cover, and the connecting end cover is provided with end cover oil grooves corresponding to the oil inlet groove and the oil drain groove.

[0011] In an embodiment of the present utility model, the box body includes a small end portion, a transition portion and a large end portion connected in sequence from top to bottom, the small end portion is provided with a plurality of secondary drainage ribs, and the plurality of secondary drainage ribs are arranged at intervals around the outer periphery of the power structure located at the top; and / or, the box body includes a small end portion, a transition portion and a large end portion connected in sequence from top to bottom, the large end portion is provided with a plurality of reinforcing ribs, and the reinforcing ribs extend from the power structure located at the bottom to the lower edge of the large end portion.

[0012] In an embodiment of the present invention, the number of the second lubrication channels is at least two, and the at least two second lubrication channels are arranged at intervals along the axial direction of the power shaft.

[0013] The present utility model also provides an engineering machine, which includes the transfer case as described above.

[0014] Through the above technical solution, the transfer case provided by the embodiment of the utility model has the following beneficial effects:

[0015] When lubricating the transfer case, oil can be supplied to the transfer cavity through the oil inlet channel located at the top of the case body, and the lubricating oil can be diverted to the first lubrication channel and the second lubrication channel. A portion of the lubricating oil can be diverted along the axial direction of the power shaft through the two second oil outlets of the first lubrication channel. The diverted lubricating oil can lubricate the bearings on both sides of the gear. A portion of the lubricating oil can pass through the second lubrication channel and fall to the gear located below the first oil outlet under its own gravity to forcibly lubricate the gear. The oil inlet channel, the first lubrication channel and the second lubrication channel in the present invention are all located above the transfer cavity. The first lubrication channel and the second lubrication channel cooperate to divert the lubricating oil in three directions. A portion of the lubricating oil lubricates the gear through the second lubrication channel, and the other portion is diverted from both sides of the first oil outlet and enters the bearing cavity of the bearing through drainage along the inner wall of the case body. Lubrication and heat dissipation of the gears and bearings are achieved by diverting the lubricating oil, which can avoid the situation in the prior art where the middle gear cannot be lubricated.

[0016] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of a transfer case at one viewing angle according to an embodiment of the present utility model;

[0019] Figure 2 is a schematic diagram of a partial cross-section structure of a transfer case according to an embodiment of the present utility model from another perspective;

[0020] Figure 3 This is a schematic structural diagram of an input end cover of a transfer case according to an embodiment of the present utility model;

[0021] Figure 4 It is a schematic structural diagram of the output end cover of a transfer case according to one embodiment of the present utility model.

[0022] Description of Reference Numerals

[0023] DETAILED DESCRIPTION

[0024] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0025] The transfer case 100 according to the present invention will be described below with reference to the accompanying drawings.

[0026] like Figures 1 to 4 As shown, in an embodiment of the present utility model, a transfer case 100 includes a power structure 1 and a case body 2. The power structure 1 includes a power shaft 11 and a gear 12 installed on the power shaft 11. The gear 12 is installed with bearings 13 on both sides of the axial direction of the power shaft 11; the case body 2 is provided with a transfer cavity for accommodating the power structure 1. The power shaft 11 is connected to the case body 2 through the bearing 13. The case body 2 is provided with an oil inlet channel 21, a first lubrication channel 22 and a second lubrication channel 23 from top to bottom. The second lubrication channel 23 is connected to the oil inlet channel 21 through the first lubrication channel 22. Both ends of the first lubrication channel 22 are arranged at the first oil outlet. The second oil outlet of the second lubrication channel 23 is located between the two first oil outlets along the axial direction of the power shaft 11. The first oil outlet is arranged corresponding to the bearing 13, and the second oil outlet is arranged corresponding to the gear 12.

[0027] It can be understood that the box width direction of the box body 2 is Figure 1 The left and right directions of the box 2 are Figure 1 In the vertical direction, the thickness of the housing 2 and the axial direction of the power shaft 11 coincide with each other, both being front-to-back directions. The oil inlet channel 21 and the second lubrication channel 23 both extend in the vertical direction. The second oil outlet of the second lubrication channel 23 is located at the top of the transfer chamber. The first lubrication channel 22 extends in the horizontal direction, with the two first oil outlets located at the left and right ends of the first lubrication channel 22, respectively.

[0028] When lubricating the transfer case 100 in this embodiment, oil can be supplied to the transfer chamber through the oil inlet channel 21 located at the top of the case body 2, and the lubricating oil can be diverted to the first lubricating channel 22 and the second lubricating channel 23. A part of the lubricating oil can be diverted along the axial direction of the power shaft 11 through the two second oil outlets of the first lubricating channel 22. The diverted lubricating oil can lubricate the bearings 13 on both sides of the gear 12. A part of the lubricating oil can pass through the second lubricating channel 23 and fall to the gear 12 located below the first oil outlet under the action of its own gravity, thereby forcibly lubricating the gear 12.

[0029] The oil inlet channel 21, the first lubrication channel 22 and the second lubrication channel 23 in this embodiment are all located above the transfer chamber. The first lubrication channel 22 and the second lubrication channel 23 cooperate to divert the lubricating oil in three directions. A portion of the lubricating oil lubricates the gear 12 through the second lubrication channel 23, and the other portion is diverted from both sides of the first oil outlet and flows along the inner wall of the housing 2 into the bearing chamber of the bearing 13. By diverting the lubricating oil, lubrication and heat dissipation of the gear 12 and the bearing 13 are achieved, thereby avoiding the situation in the prior art where the middle gear cannot be lubricated.

[0030] like Figure 1 As shown, there are multiple power structures 1, and the multiple power structures 1 are arranged in sequence from top to bottom. The box body 2 is provided with a guide structure corresponding to the power structure 1. The guide structure is used to guide the lubricating oil from top to bottom, so that the lubricating oil flows from one power structure 1 to another power structure 1. In this embodiment, a guide structure is provided on the box body 2. While guiding the lubricating oil downward, it can also enable the lubricating oil after lubricating the upper power structure 1 to lubricate the power structure 1 located below. The guide structure in this embodiment is used to guide the lubricating oil from the upper power structure 1 to the lower power structure 1, guide the flow trajectory of the lubricating oil, avoid the situation where the lubricating oil spray cannot fully lubricate the power structure 1, and can also drain the lubricating oil in the bearing 13 located in the upper power structure 1 to achieve heat dissipation of the bearing 13.

[0031] In one embodiment, the guide structure includes a main drainage rib 24, an oil inlet groove 25 and an oil drain groove 26. The main drainage rib 24 is arranged to be inclined from top to bottom along the box width direction of the box body 2 from the outer edge of the box body 2; the oil inlet groove 25 is inclined from top to bottom along the box width direction of the box body 2, and the lower end of the main drainage rib 24 extends to the inlet of the oil inlet groove 25, and the outlet of the oil inlet groove 25 is connected to the bearing cavity of the bearing 13; the oil drain groove 26 is located below the oil inlet groove 25, and the inlet of the oil drain groove 26 is connected to the outlet of the bearing cavity.

[0032] In this embodiment, the main drainage rib 24, the oil inlet groove 25, and the oil drain groove 26 are all inclined from top to bottom in the left-right direction, which can guide the lubricating oil to flow smoothly downward and avoid the lubricating oil from being sprayed vertically. The main drainage rib 24 protrudes relative to the housing 2 to block the flow of the lubricating oil, so that the lubricating oil can enter the oil inlet groove 25 located at the lower end of the main drainage rib 24, enter the bearing cavity, and then be drained to the power structure 1 located below through the oil drain groove 26. By arranging the drainage rib, the oil inlet groove 25, and the oil drain groove 26 on the housing 2, the lubricating oil can enter the bearing cavity along the inner wall of the housing 2 through the drainage rib and the oil inlet groove 25, and form an oil collection in the bearing cavity to lubricate the bearing 13. At the same time, it flows out through the oil drain groove 26 to remove heat, which can avoid the situation where the lubricating oil cannot be drained after entering the bearing 13 and the heat generated by the bearing 13 cannot be removed in time.

[0033] It should be noted that, in one embodiment, the multiple power structures 1 include a top output structure 1a, two bottom output structures 1b and an input structure 1c, and the guide structure corresponding to the top output structure 1a of the top output structure 1a is the first guide structure; the center line connecting the two bottom output structures 1b and the top output structure 1a is an isosceles triangle, and the guide structure corresponding to the bottom output structure 1b is the second guide structure; an input structure 1c is located in the isosceles triangle and is used to output power to the top output structure 1a and the two bottom output structures 1b, and the guide structure corresponding to the input structure 1c is the third guide structure, and the third guide structure is provided with an oil drain groove 26 facing the bottom output structure 1b.

[0034] like Figure 1 As shown, this embodiment comprises four power structures 1: one top output structure 1a, one input structure 1c, and two bottom output structures 1b. One input structure 1c can simultaneously output power to all three output structures, with the gear 12 of the input structure 1c meshing with the gears 12 of the output structures. The three output structures are arranged around the central input structure 1c, and the third diversion structure is equipped with an oil drain groove 26 corresponding to each bottom output structure 1b, ensuring that lubricating oil is fully diverted to the bottom output structures 1b.

[0035] When lubricating the transfer case 100, lubricating oil first flows through the main guide ribs 24 of the first guide structure into the oil inlet groove 25, lubricating the bearings 13 of the top output structure 1a. The main guide ribs 24 and oil inlet groove 25 of the third guide structure, located below the oil drain groove 26 of the first guide structure, allow oil to flow through the oil drain groove 26 of the first guide structure and the main guide ribs 24 of the third guide structure into the oil inlet groove 25, fully lubricating the bearings 13 of the input structure 1c. Lubricating oil flowing from the oil drain groove 26 of the third guide structure can simultaneously supply oil to the two bottom output structures 1b.

[0036] like Figure 1 As shown, the second flow-guiding structure includes two oil inlet grooves 25. The third flow-guiding structure's oil drain groove 26 connects to the bearing cavity of the bottom output structure 1b through one of the oil inlet grooves 25. The inlet of the other oil inlet groove 25 faces away from the input structure 1c. Oil inlet grooves 25 are provided on both the left and right sides of the top of the bottom output structure 1b. One of the oil inlet grooves 25 directly corresponds to the oil drain groove 26 of the third flow-guiding structure, while the other oil inlet groove 25 connects to the inner wall of the housing 2 via a main drainage rib 24. These two oil inlet grooves 25 channel lubricating oil to the bottom output structure 1b, ensuring that the bottom output structure 1b receives sufficient lubricating oil and is fully lubricated.

[0037] In an embodiment of the present invention, the third flow-guiding structure includes two oil inlet grooves 25, which are arranged on both sides of the power shaft 11 of the input structure 1c along the width of the housing 2. One of the oil inlet grooves 25 is located below the oil drain groove 26 of the first flow-guiding structure. Two oil inlet grooves 25 are provided on the top of the input structure 1c. The two oil inlet grooves 25 can be symmetrically arranged relative to the center line of the housing 2, and the upper end of each oil inlet groove 25 is connected to a main drainage rib 24. The cooperation of the two sets of main drainage ribs 24 and the oil inlet groove 25 ensures that the input structure 1c located in the middle is fully lubricated. The oil drain grooves 26 of the first, second, and third flow-guiding structures can be arranged according to actual use requirements. In one embodiment, in order to increase the heat dissipation speed of the oil drain cycle, the first, second, and third flow-guiding structures are each provided with multiple oil drain grooves 26.

[0038] It should be noted that the input structure 1c further includes a connecting end cover 14, through which the bearing 13 is connected to the housing 2, and the connecting end cover 14 is provided with an end cover oil groove 141 corresponding to the oil inlet groove 25 and the oil drain groove 26. Figure 3 As shown, the connecting end cover 14 includes an input end cover 14a and an output end cover 14b. The input end cover 14a is provided with four end cover oil grooves 141. The four end cover oil grooves 141 correspond to the positions of the oil inlet groove 25 and the oil drain groove 26 on the box body 2, ensuring that the lubricating oil can smoothly enter the intermediate bearing 13 and meet the oil drain requirements. Figure 4 As shown, the output end cap 14b is provided with three end cap oil grooves 141, and the end cap oil grooves 141 correspond to the positions of the oil inlet grooves 25 and oil drain grooves 26 on the housing 2, ensuring that the lubricating oil can smoothly enter the bearings 13 located at the top and bottom, while also meeting the oil drainage requirements. By arranging the drainage ribs, oil inlet grooves 25, and oil drain grooves 26 on the housing 2, and providing end cap oil grooves 141 corresponding to the oil drain grooves 26 on the connecting end cap 14, it is possible to collect oil and promptly remove heat from the bearings 13, facilitating the discharge of lubricating oil from the bearing cavity, and avoiding the situation where the lubricating oil cannot be discharged from the bearings 13, resulting in a lack of heat dissipation. In conjunction with the second lubrication channel 23 at the top, forced lubrication and heat dissipation are achieved, enabling lubricating oil circulation and heat dissipation. In addition, the lubricating oil flowing through the end cap oil grooves 141 provided on the output end cap 14b can lubricate the splines within the power shaft 11.

[0039] like Figure 1 As shown, the box body 2 includes a small end portion 27, a transition portion 28 and a large end portion 29 connected in sequence from top to bottom, and the small end portion 27 is provided with a plurality of secondary drainage ribs 271, and the plurality of secondary drainage ribs 271 are arranged at intervals around the outer periphery of the power structure 1 located at the top; and the box body 2 includes a small end portion 27, a transition portion 28 and a large end portion 29 connected in sequence from top to bottom, and the large end portion 29 is provided with a plurality of reinforcing ribs 291, and the reinforcing ribs 291 extend from the power structure 1 located at the bottom to the lower edge of the large end portion 29.

[0040] In one embodiment, the small end portion 27 is provided with three secondary drainage ribs 271 to guide lubricating oil from the top of the housing 2 to the top output structure 1a. The large end portion 29 is provided with five reinforcing ribs 291, spaced horizontally. The three central ribs 291 extend vertically, and the two ribs 291 on either side may form an angle with each other. The housing 2 may be provided with an oil drain port 201 for discharging oil. The oil drain port 201 may be located between the two bottom output structures 1b, with one of the ribs 291 positioned corresponding to the location of the oil drain port 201. The multiple secondary drainage ribs 271 at the top of the housing 2 in this embodiment ensure smooth downward flow of lubricating oil from the top, which, combined with the multiple reinforcing ribs 291 at the bottom, ensures the strength of the housing 2. In this embodiment, the cross-sectional dimensions of the large end portion 29 are larger than those of the small end portion 27, facilitating installation of the bottom output structure 1b. In other embodiments, the number of output structures may be adjusted based on actual usage requirements.

[0041] Specifically, the number of the second lubrication channels 23 is at least two, and the at least two second lubrication channels 23 are arranged at intervals along the axial direction of the power shaft 11 . Figure 1 The two second lubrication channels 23 are spaced apart in the left-right direction, and both second lubrication channels 23 are located directly above the gear 12. In other embodiments, the number of the second lubrication channels 23 can be set according to actual usage requirements.

[0042] The present invention further provides an engineering machine including a transfer case 100 as described above. The specific structure of the transfer case 100 is similar to that of the aforementioned embodiments. Since the engineering machine utilizes all of the technical solutions of all of the aforementioned embodiments, it at least possesses all of the beneficial effects brought about by the technical solutions of the aforementioned embodiments, which will not be detailed here.

[0043] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0044] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A transfer case, characterized in that: The transfer case (100) comprises: A power structure (1) comprises a power shaft (11) and a gear (12) mounted on the power shaft (11), wherein the gear (12) is provided with bearings (13) on both sides of the axial direction of the power shaft (11); The housing (2) is provided with a transfer chamber for accommodating the power structure (1); the power shaft (11) is connected to the housing (2) via the bearing (13); the housing (2) is provided with an oil inlet channel (21), a first lubricating channel (22), and a second lubricating channel (23) in sequence from top to bottom; the second lubricating channel (23) is connected to the oil inlet channel (21) via the first lubricating channel (22); both ends of the first lubricating channel (22) are provided at a first oil outlet; a second oil outlet of the second lubricating channel (23) is located between the two first oil outlets along the axial direction of the power shaft (11); the first oil outlet is provided corresponding to the bearing (13), and the second oil outlet is provided corresponding to the gear (12).

2. The transfer case according to claim 1, characterized in that: There are multiple power structures (1), and the multiple power structures (1) are arranged in sequence from top to bottom. The box (2) is provided with a guide structure corresponding to the power structure (1), and the guide structure is used to guide the lubricating oil from top to bottom, so that the lubricating oil flows from one power structure (1) to another power structure (1).

3. The transfer case according to claim 2, characterized in that: The flow guiding structure comprises: Main drainage ribs (24) are arranged from the outer edge of the box body (2) along the box width direction of the box body (2); An oil inlet groove (25), wherein the lower end of the main drainage rib (24) extends to the inlet of the oil inlet groove (25), and the outlet of the oil inlet groove (25) is connected to the bearing cavity of the bearing (13); The oil drain groove (26) is located below the oil inlet groove (25), and the inlet of the oil drain groove (26) is connected to the outlet of the bearing cavity.

4. The transfer case according to claim 3, characterized in that: The plurality of power structures (1) include: A top output structure (1a), wherein the flow guiding structure corresponding to the top output structure (1a) is a first flow guiding structure; Two bottom output structures (1b), the guide structure corresponding to the bottom output structure (1b) being a second guide structure; An input structure (1c) is used to output power to the top output structure (1a) and the two bottom output structures (1b); the flow guide structure corresponding to the input structure (1c) is a third flow guide structure; and the third flow guide structure is provided with an oil drain groove (26) toward the bottom output structure (1b).

5. The transfer case according to claim 4, characterized in that: The second flow guiding structure comprises two oil inlet grooves (25), the oil drain groove (26) of the third flow guiding structure is connected to the bearing cavity of the bottom output structure (1b) through one of the oil inlet grooves (25), and the inlet of the other oil inlet groove (25) faces away from the input structure (1c).

6. The transfer case according to claim 4, characterized in that: The third flow-guiding structure comprises two oil inlet grooves (25), which are arranged on both sides of the power shaft (11) of the input structure (1c) along the box width direction of the box body (2), and one of the oil inlet grooves (25) is located below the oil drain groove (26) of the first flow-guiding structure.

7. The transfer case according to any one of claims 4 to 6, characterized in that: The input structure (1c) further comprises a connecting end cover (14), the bearing (13) is connected to the housing (2) via the connecting end cover (14), and the connecting end cover (14) is provided with end cover oil grooves (141) corresponding to the oil inlet groove (25) and the oil drain groove (26).

8. The transfer case according to any one of claims 1 to 6, characterized in that: The box body (2) comprises a small end portion (27), a transition portion (28) and a large end portion (29) connected in sequence from top to bottom, the small end portion (27) being provided with a plurality of secondary drainage ribs (271), the plurality of secondary drainage ribs (271) being arranged at intervals around the outer periphery of the power structure (1) located at the top; and / or, The box body (2) comprises a small end portion (27), a transition portion (28), and a large end portion (29) connected in sequence from top to bottom, the large end portion (29) being provided with a plurality of reinforcing ribs (291), the reinforcing ribs (291) extending from the power structure (1) at the bottom to the lower edge of the large end portion (29).

9. The transfer case according to any one of claims 1 to 6, characterized in that: The number of the second lubrication channels (23) is at least two, and the at least two second lubrication channels (23) are arranged at intervals along the axial direction of the power shaft (11).

10. An engineering machine, characterized in that: The engineering machinery comprises the transfer case (100) according to any one of claims 1 to 9.

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