Transfer case assembly lubricating structure

Abstract

The utility model discloses a transfer case assembly lubricating structure, which can transfer lubricating oil at the lower part in a transfer case shell through a gear pump, so that the lubricating oil can be better guided to various structures needing to be lubricated, the integration of the gear pump and a transfer case is good, the arrangement of a lubricating oil path is reasonable, and the lubricating effect is good. And each structure in the transfer case shell can be lubricated more sufficiently and specifically. The main structure of the transfer case comprises a gear pump, an oil suction pipe, a pump shell of the gear pump, an outer rotor and an inner rotor, the open end of the pump shell is sealed by a transfer case shell, an input shaft of the transfer case penetrates through the pump shell and is in rotary sealing fit with the pump shell, the inner rotor is driven by the input shaft, and the input shaft is provided with a shaft inner hole, a shaft hole oil inlet channel and a plurality of shaft small holes. The small hole in the shaft is located in the transfer case shell, one end of the oil suction pipe is provided with a filter screen structure, the pump shell is provided with a pump ball pipe, a screw plug, an oil inlet hole and an oil outlet hole, a steel ball used for blocking the small-diameter hole is arranged in the large-diameter hole, and a spring used for jacking the steel ball is arranged on the screw plug.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle transmission and transmission mechanism lubrication, and in particular relates to a transfer case assembly lubrication structure. Background Art

[0002] The transfer case is a common transmission mechanism in automobiles. Its housing (transfer case housing) contains lubricating oil, which lubricates the gears, bearings, bushings, and other internal components. Generally, the oil level within the transfer case housing should occupy between one-quarter and one-third of the housing's internal height (the specific level depends on the actual situation). This allows the rotation of the lower gears to stir the oil in the lower portion of the housing, moving it upward and splashing it upward, thereby lubricating the components within the upper portion of the housing. Utility Model Content

[0003] The utility model provides a lubrication structure for a transfer case assembly. In addition to relying on the movement of the lower gear to enable the lubricating oil to move upward, the lubricating oil in the lower part of the transfer case housing is mobilized by a gear pump, so that the lubricating oil can be better directed to various structures that need lubrication. The gear pump and the transfer case have good integration, the lubricating oil circuit is reasonably arranged, and the various structures in the transfer case housing can be lubricated more fully and more specifically.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A transfer case assembly lubrication structure includes a gear pump and an oil suction pipe. The gear pump includes a pump housing with an open end and disposed outside the transfer case housing, an outer rotor disposed within the pump housing, and an inner rotor disposed within and mating with the outer rotor. The open end of the pump housing is sealed by the transfer case housing, and the pump housing has an oil suction chamber and an oil pressure chamber.

[0006] The input shaft of the transfer case passes through the pump housing and is in rotational sealing engagement with the pump housing. One end of the input shaft, which is located in the transfer case housing, is closed. The inner rotor is driven by the input shaft. The input shaft is provided with an inner shaft hole, which is provided with a bowl-shaped plug. The bowl-shaped plug divides the inner shaft hole into an outer hole and an inner hole.

[0007] The input shaft is provided with a shaft hole oil inlet passage, the oil pressure chamber, the shaft hole oil inlet passage and the inner section hole are connected in sequence, and the input shaft is provided with a plurality of shaft holes connected with the inner section hole, and the shaft holes are located in the transfer case;

[0008] One end of the oil suction pipe is connected to the oil suction chamber, and the other end of the oil suction pipe is provided with a filter structure located in the transfer case housing. The pump housing is provided with a pump ball pipe, a screw plug, an oil inlet hole connected to the oil pressure chamber and an oil outlet hole connected to the inside of the transfer case housing. The pipe hole of the pump ball pipe includes a small diameter hole and a large diameter hole. The small diameter hole is connected to the oil inlet hole. A steel ball that can move along the large diameter hole and is used to block the small diameter hole is provided in the large diameter hole. A pipe wall hole is provided on the side wall of the pump ball pipe. The large diameter hole, the pipe wall hole and the oil outlet hole are connected in sequence. One end of the large diameter hole is sealed by a screw plug, and the screw plug is provided with a spring for pressing the steel ball.

[0009] Preferably, an end bearing is provided in the transfer case housing adjacent to the pump case, the input shaft is cooperatively connected to the end bearing, the end bearing is cooperatively connected to the transfer case housing, a bearing ring oil passage is provided on the transfer case housing for supplying oil to the end bearing, a dorsal oil hole and a dorsal oil passage are provided in the pump case, the oil pressure chamber, the dorsal oil hole, the dorsal oil passage and the bearing ring oil passage are connected in sequence, the dorsal oil hole and the transfer case housing are located on opposite sides of the outer rotor, and the dorsal oil passage and the transfer case housing are located on opposite sides of the outer rotor.

[0010] Preferably, the input shaft and the pump housing are rotatably sealed via an outer sealing oil ring, which is relatively fixed to the pump housing. The input shaft and the outer sealing oil ring are rotatably sealed. An inner sealing oil ring is provided on the input shaft, which is rotatably sealed with the transfer case housing.

[0011] Preferably, the filter structure is a mesh cylinder with an open end, the open end of the mesh cylinder is connected to the oil suction pipe, the vertical height difference between the highest point inside the transfer case housing and the lowest point inside the transfer case housing is L, and the vertical height difference between the highest point of the filter structure and the lowest point inside the transfer case housing is M, M<0.2L.

[0012] Preferably, a protective magnetic block is provided in the transfer case housing, and the protective magnetic block is arranged at the bottom of the transfer case housing. A near baffle is provided in the transfer case housing, and the near baffle is located above the filter structure. The vertical projection of the filter structure falls within the vertical projection range of the near baffle. The vertical height difference between the highest point of the near baffle and the lowest point inside the transfer case housing is N, and N is less than 1.1M.

[0013] Preferably, the inner rotor is provided with a plurality of external pin grooves, and the input shaft is provided with a plurality of internal pin grooves corresponding to the external pin grooves one by one. In the corresponding external pin grooves and internal pin grooves: a connecting pin is provided on the external pin groove, one end of the connecting pin is fixed in cooperation with the external pin groove, and the other end of the connecting pin is fixed in cooperation with the internal pin groove, and the length direction of the connecting pin is perpendicular to the axis of the input shaft.

[0014] The beneficial effects of the present invention are as follows: in addition to relying on the shifting of the lower gear to enable the lubricating oil to move upward, the gear pump is also used to mobilize the lubricating oil in the lower part of the transfer case housing, so that the lubricating oil can be better directed to the structures that need lubrication. The gear pump and the transfer case have good integration, the lubricating oil circuit is reasonably arranged, and the various structures in the transfer case housing can be lubricated more fully and more specifically; the back side oil hole, the back side oil channel and other structures are provided, so that the lubricating oil can be provided to the end bearings; the filter structure can be protected, its clogging is delayed, and the oil absorption and lubrication effects are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded view of the utility model;

[0016] Figure 2 It is a partial structural diagram of the utility model;

[0017] Figure 3 This is a partial structural cross-sectional view of the pump casing of the utility model;

[0018] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0019] Figure 5 This is a schematic diagram of the structure of the outer rotor and inner rotor of the utility model;

[0020] Figure 6 This is a structural diagram of the pump ball tube of the utility model;

[0021] Figure 7 It is a partial structural sectional view of the pump ball tube of the utility model.

[0022] Figure numerals: oil suction pipe 1, transfer case housing 2, bearing oil channel 2a, bearing 201, oil suction chamber 3a, oil pressure chamber 3b, pump housing 301, oil inlet hole 301a, oil outlet hole 301b, dorsal oil hole 301c, dorsal oil channel 301d, outer sealing oil ring 301.1, outer rotor 302, inner rotor 303, outer pin groove 303a, connecting pin 304, input shaft 4, outer section hole 4a, inner section hole 4b, shaft hole oil inlet channel 4c, small hole 4d on shaft, inner sealing oil ring 4.1, bowl-shaped plug 401, pump ball tube 501, small diameter hole 501a, large diameter hole 501b, tube wall hole 501c, screw plug 502, steel ball 503, spring 504, mesh tube 6, near baffle 601. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown,

[0025] A transfer case assembly lubrication structure includes a gear pump and an oil suction pipe 1. The gear pump includes a pump housing 301 with one end open and disposed outside the transfer case housing 2, an outer rotor 302 disposed within the pump housing 301, and an inner rotor 303 disposed within and mating with the outer rotor 302. The open end of the pump housing 301 is sealed by the transfer case housing 2. The pump housing 301 defines an oil suction chamber 3a and an oil pressure chamber 3b.

[0026] The input shaft 4 of the transfer case passes through the pump housing 301 and is in rotational sealing engagement with the pump housing 301. The input shaft 4 is provided with an inner shaft hole. One end of the input shaft 4 located within the transfer case housing 2 is sealed. The inner rotor 303 is driven by the input shaft 4. A bowl-shaped plug 401 is provided on the inner shaft hole. The bowl-shaped plug 401 divides the inner shaft hole into an outer hole 4a and an inner hole 4b.

[0027] The input shaft 4 is provided with a shaft hole oil inlet passage 4c, the oil pressure chamber 3b, the shaft hole oil inlet passage 4c and the inner section hole 4b are sequentially connected, and the input shaft 4 is provided with a plurality of shaft holes 4d connected to the inner section hole 4b, and the shaft holes 4d are located in the transfer case housing 2;

[0028] One end of the oil suction pipe 1 is connected to the oil suction chamber 3a, and the other end of the oil suction pipe 1 is provided with a filter structure located in the transfer case housing 2. A pump ball pipe 501, a screw plug 502, an oil inlet hole 301a connected to the pressure oil chamber 3b and an oil outlet hole 301b connected to the inside of the transfer case housing 2 are provided on the pump housing 301. The pipe hole of the pump ball pipe 501 includes a small diameter hole 501a and a large diameter hole 501b. The small diameter hole 501a is connected to the inlet hole 301a. The oil hole 301a and the large diameter hole 501b are provided with a steel ball 503 that can move along the large diameter hole 501b and is used to block the small diameter hole 501a. A tube wall hole 501c is provided on the side wall of the pump ball tube 501. The large diameter hole 501b, the tube wall hole 501c and the oil outlet hole 301b are connected in sequence. One end of the large diameter hole 501b is sealed by a screw plug 502, and the screw plug 502 is provided with a spring 504 for pressing the steel ball 503.

[0029] One end of spring 504 is fixed relative to screw plug 502, while the other end is fixed relative to steel ball 503. Spring 504 is partially or entirely located within large-diameter hole 501b. The axis of spring 504, the axis of small-diameter hole 501a, and the axis of large-diameter hole 501b all coincide, and small-diameter hole 501a and large-diameter hole 501b are connected. Small-diameter hole 501a, the center of steel ball 503, and spring 504 are arranged in sequence along the axial direction of spring 504. Screw plug 502 is threadedly connected to pump housing 301.

[0030] The gear pump itself belongs to the existing technology, but when used in the present invention, the transfer case housing 2 is directly used to seal the open end of the pump housing 301, which is equivalent to using the transfer case housing 2 as "half of the gear pump housing". On this basis, the input shaft 4 of the transfer case is directly used as the power shaft of the gear pump (the input shaft 4 of the transfer case passes through the pump housing 301, and the inner rotor 303 is driven by the input shaft 4). The overall integration is excellent and space is relatively saved.

[0031] Oil suction part of the gear pump: the lubricating oil reaches the oil suction chamber 3a through the oil suction pipe 1, and then reaches the oil pressure chamber 3b through the inside of the gear pump;

[0032] Oil outlet part of the gear pump: The lubricating oil enters the inner hole 4b through the oil pressure chamber 3b and the shaft hole oil inlet channel 4c, and then is ejected through the small holes 4d on each shaft on the input shaft 4, so that part of the lubricating oil can be sprayed to the gears and other structures in the upper part of the transfer case housing 2, and then this part of the lubricating oil falls back to the lower part of the transfer case housing 2.

[0033] Compared with the traditional lubrication method of "relying solely on the gears at the lower part of the transfer case housing 2 to push the lubricating oil upwards", the utility model has a much better effect of supplying oil to the various structures at the upper part of the transfer case housing 2, so the lubrication, cooling and heat dissipation effects are also better, and the small holes 4d on each shaft on the input shaft 4 can be directly arranged according to the structure that needs to be lubricated, so the lubrication is more targeted.

[0034] In addition, since the speed of the input shaft 4 of the transfer case varies, when the speed of the input shaft 4 is low, the oil pressure in the oil pressure chamber 3b is not high enough to push the steel ball 503 and the spring 504 to move. When the speed of the input shaft 4 is high, the oil pressure in the oil pressure chamber 3b is high, which will push the steel ball 503 and the spring 504 to move to the right ( Figure 7(perspective view), a portion of the lubricating oil in the oil pressure chamber 3b is sprayed back into the transfer case housing 2 through the oil inlet hole 301a, the small-diameter hole 501a, the large-diameter hole 501b, the tube wall hole 501c, and the oil outlet hole 301b. This sprayed-back lubricating oil can be used to lubricate certain components (directing the oil outlet hole 301b toward these components). For example, some bushings mating with the shaft are self-lubricating, or require only a small amount of lubricating oil at low shaft speeds. However, when the speed of the input shaft 4 increases, the speed of the shaft mating with the bushing also increases accordingly, potentially requiring more lubricating oil. This solution can provide more lubricating oil, thereby fully protecting the internal structure of the transfer case, ensuring the stability of the operating process, and guaranteeing the service life of the overall structure.

[0035] An end bearing 201 is provided in the transfer case housing 2 adjacent to the pump housing 301, the input shaft 4 is cooperatively connected to the end bearing 201, and the end bearing 201 is cooperatively connected to the transfer case housing 2. A bearing oil passage 2a is provided on the transfer case housing 2 to supply oil to the end bearing 201. A dorsal oil hole 301c and a dorsal oil passage 301d are provided in the pump housing 301. The oil pressure chamber 3b, the dorsal oil hole 301c, the dorsal oil passage 301d and the bearing oil passage 2a are connected in sequence. The dorsal oil hole 301c and the transfer case housing 2 are located on opposite sides of the outer rotor 302, and the dorsal oil passage 301d and the transfer case housing 2 are located on opposite sides of the outer rotor 302.

[0036] The end bearing 201 mates with the input shaft 4 and is a crucial component requiring lubrication. Lubricating oil can reach the end bearing 201 through the backside oil hole 301c, backside oil passage 301d, and bearing oil passage 2a, thereby lubricating the end bearing 201. Because the open end of the pump housing 301 is sealed by the transfer case 2, there is limited space for additional oil passages on the side adjacent to the transfer case 2. Therefore, the backside oil hole 301c and backside oil passage 301d are intentionally provided on the reverse side to provide lubricating oil to the end bearing 201.

[0037] The input shaft 4 and the pump housing 301 are rotatably sealed via an outer oil sealing ring 301.1. The outer oil sealing ring 301.1 is relatively fixed to the pump housing 301. The input shaft 4 and the outer oil sealing ring 301.1 are rotatably sealed. An inner oil sealing ring 4.1 is provided on the input shaft 4, and the inner oil sealing ring 4.1 is rotatably sealed with the transfer case housing 2.

[0038] The outer oil seal ring 301.1 and the inner oil seal ring 4.1 realize outer and inner sealing, thereby preventing lubricating oil from leaking. In addition, the outer oil seal ring 301.1 and the inner oil seal ring 4.1 are low in cost and easy to replace.

[0039] The filter structure is a mesh tube 6 with an open end. The open end of the mesh tube 6 is connected to the oil suction pipe 1. The vertical distance between the highest point inside the transfer case housing 2 and the lowest point inside the transfer case housing 2 is L. The vertical distance between the highest point of the filter structure and the lowest point inside the transfer case housing 2 is M, and M is less than 0.2L.

[0040] The mesh drum 6 (filter structure) is located at a lower position inside the transfer case housing 2, which can ensure that the mesh drum 6 is completely immersed in the lubricating oil, which is beneficial to ensuring the oil suction effect of the gear pump.

[0041] A protective magnetic block is provided in the transfer case housing 2, and the protective magnetic block is arranged at the bottom of the transfer case housing 2. A near baffle 601 is provided in the transfer case housing 2, and the near baffle 601 is located above the filter structure. The vertical projection of the filter structure falls within the vertical projection range of the near baffle 601. The vertical distance between the highest point of the near baffle 601 and the lowest point inside the transfer case housing 2 is N, and N is less than 1.1M.

[0042] Protective magnets are a well-known technology in the transfer case field. Because gears and other components continuously generate tiny iron filings during operation, over time, the lubricating oil in the transfer case housing 2 can accumulate these filings. This not only affects lubrication but also rapidly reduces the service life of components like gears and bearings. Therefore, protective magnets are typically installed in the lower portion of the transfer case housing 2 to absorb these filings.

[0043] In the present invention, the lubricating oil that is mobilized to the upper part of the transfer case housing 2 (the lower gear pushes the oil upward, the gear pump sucks the oil and sprays it onto the upper structure of the transfer case housing 2 through the small hole 4d on the shaft, etc.) will carry a trace of iron chips when it falls. If these iron chips directly pass through the filter structure during their descent, some of them will adhere to the filter structure and will not be ultimately attracted by the protective magnetic block at the bottom. After a period of time, the filter structure will easily become clogged (partially clogged), affecting the oil absorption effect.

[0044] In view of this, a near baffle 601 is provided above the filter structure. In this way, when the lubricating oil mobilized to the upper part of the transfer case housing 2 falls, the iron chips it carries with it cannot pass directly through the filter structure, but must bypass the near baffle 601 and fall. In this way, most of the iron chips fall to the bottom of the transfer case housing 2 first. In this way, the probability of the iron chips directly reaching the filter structure is greatly reduced, and they are more likely to fall and pass near the protective magnetic block first. In this way, the blockage of the filter structure can be greatly delayed, and the normal operation of the filter structure during the maintenance period can be guaranteed (after the maintenance period, the transfer case housing 2 will be disassembled to clean and maintain the filter structure and other structures).

[0045] The inner rotor 303 is provided with a plurality of outer pin grooves 303a, and the input shaft 4 is provided with a plurality of inner pin grooves corresponding to the outer pin grooves 303a one by one. In the corresponding outer pin grooves 303a and inner pin grooves: a connecting pin 304 is provided on the outer pin groove 303a, one end of the connecting pin 304 is fixed in cooperation with the outer pin groove 303a, and the other end of the connecting pin 304 is fixed in cooperation with the inner pin groove, and the length direction of the connecting pin 304 is perpendicular to the axis of the input shaft 4.

[0046] The connection between the inner rotor 303 and the input shaft 4 is achieved by using the connecting pin 304 , which has a simple structure, is easy to assemble, and is convenient for maintenance.

[0047] 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

1. A transfer case assembly lubrication structure, comprising a gear pump and an oil suction pipe, wherein the gear pump comprises a pump housing with one end open and disposed outside the transfer case housing, an outer rotor disposed within the pump housing, and an inner rotor disposed within and mating with the outer rotor, wherein the open end of the pump housing is sealed by the transfer case housing, and the pump housing comprises an oil suction chamber and an oil pressure chamber; wherein the gear pump comprises: The input shaft of the transfer case passes through the pump housing and is in rotational sealing engagement with the pump housing. One end of the input shaft, which is located in the transfer case housing, is closed. The inner rotor is driven by the input shaft. The input shaft is provided with an inner shaft hole, which is provided with a bowl-shaped plug. The bowl-shaped plug divides the inner shaft hole into an outer hole and an inner hole. The input shaft is provided with a shaft hole oil inlet passage, the oil pressure chamber, the shaft hole oil inlet passage and the inner section hole are connected in sequence, and the input shaft is provided with a plurality of shaft holes connected with the inner section hole, and the shaft holes are located in the transfer case; One end of the oil suction pipe is connected to the oil suction chamber, and the other end of the oil suction pipe is provided with a filter structure located in the transfer case housing. The pump housing is provided with a pump ball pipe, a screw plug, an oil inlet hole connected to the oil pressure chamber and an oil outlet hole connected to the inside of the transfer case housing. The pipe hole of the pump ball pipe includes a small diameter hole and a large diameter hole. The small diameter hole is connected to the oil inlet hole. A steel ball that can move along the large diameter hole and is used to block the small diameter hole is provided in the large diameter hole. A pipe wall hole is provided on the side wall of the pump ball pipe. The large diameter hole, the pipe wall hole and the oil outlet hole are connected in sequence. One end of the large diameter hole is sealed by a screw plug, and the screw plug is provided with a spring for pressing the steel ball.

2. A transfer case assembly lubrication structure according to claim 1, characterized in that: An end bearing is provided in the transfer case housing adjacent to the pump housing, the input shaft is cooperatively connected to the end bearing, the end bearing is cooperatively connected to the transfer case housing, a bearing ring oil passage is provided on the transfer case housing for supplying oil to the end bearing, a dorsal oil hole and a dorsal oil passage are provided in the pump housing, the oil pressure chamber, the dorsal oil hole, the dorsal oil passage and the bearing ring oil passage are connected in sequence, the dorsal oil hole and the transfer case housing are located on opposite sides of the outer rotor, and the dorsal oil passage and the transfer case housing are located on opposite sides of the outer rotor.

3. The transfer case assembly lubrication structure according to claim 1, characterized in that: The input shaft and the pump housing are rotatably sealed by an outer sealing oil ring, which is relatively fixed to the pump housing. The input shaft and the outer sealing oil ring are rotatably sealed. An inner sealing oil ring is provided on the input shaft, and the inner sealing oil ring is rotatably sealed with the transfer case housing.

4. A transfer case assembly lubrication structure according to claim 1, 2 or 3, characterized in that: The filter structure is a mesh cylinder with an open end, and the open end of the mesh cylinder is connected to the oil suction pipe. The vertical height difference between the highest point inside the transfer case housing and the lowest point inside the transfer case housing is L, and the vertical height difference between the highest point of the filter structure and the lowest point inside the transfer case housing is M, M<0.2L.

5. The transfer case assembly lubrication structure according to claim 4, characterized in that: A protective magnetic block is provided in the transfer case housing, and the protective magnetic block is arranged at the bottom of the transfer case housing. A near baffle is provided in the transfer case housing, and the near baffle is located above the filter structure. The vertical projection of the filter structure falls within the vertical projection range of the near baffle. The vertical height difference between the highest point of the near baffle and the lowest point inside the transfer case housing is N, and N is less than 1.1M.

6. A transfer case assembly lubrication structure according to claim 1, 2 or 3, characterized in that: The inner rotor is provided with a plurality of outer pin grooves, and the input shaft is provided with a plurality of inner pin grooves corresponding to the outer pin grooves one by one. In the corresponding outer pin grooves and inner pin grooves: a connecting pin is provided on the outer pin groove, one end of the connecting pin is fixed in cooperation with the outer pin groove, and the other end of the connecting pin is fixed in cooperation with the inner pin groove, and the length direction of the connecting pin is perpendicular to the axis of the input shaft.

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