In-axle oil guide pipe, electric drive system and vehicle

Abstract

The utility model discloses related to vehicle technical field, disclose a kind of axle inside oil guide pipe, electric drive system and vehicle, the axle inside oil guide pipe includes tube body and the claw that is set to the outside of tube body, claw is suitable for with the clamping groove of electric drive system reducer input shaft clamping, the first end of tube body is suitable for with the oil outlet of electric drive system reducer casing communication, the second end of tube body is suitable for with the inner hole of electric drive system motor shaft communication;Claw gradually inclines to the direction of first end from its fixed end to its free end, the outer circumferential surface of tube body is provided with bead, and one end of bead is connected with fixed end, and the other end of bead extends to the direction of first end. The technical scheme of the utility model is applied, can reduce the possibility of axle inside oil guide pipe claw fracture, also help to improve the yield of axle inside oil guide pipe.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, specifically to an in-shaft oil guide pipe, an electric drive system, and a vehicle. Background Technology

[0002] Some vehicle electric drive systems have an oil guide pipe installed in the input shaft of the reducer. This pipe guides the lubricating oil output from the reducer housing's oil outlet to the motor shaft. To enhance axial restraint on the oil guide pipe, some pipes are equipped with chucks that engage with grooves within the reducer input shaft, effectively reducing axial movement of the oil guide pipe within the shaft. However, this type of oil guide pipe with chucks may present the following technical problems: During the high-speed operation of the input shaft of the reducer, the chucks on the oil guide pipe are subjected to force, which may cause the chucks to break. Oil guide tubes are usually made of plastic or nylon. The oil guide tube has a slender claw on its outer periphery, which makes the oil guide tube difficult to manufacture and the yield rate difficult to guarantee. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide an in-shaft oil guide pipe, an electric drive system and a vehicle, which are intended to solve at least one of the above-mentioned technical problems.

[0004] In a first aspect, embodiments of this application provide an internal oil guide pipe, including a pipe body and a chuck disposed on the outside of the pipe body. The chuck is adapted to engage with a slot in the input shaft of an electric drive system reducer. A first end of the pipe body is adapted to communicate with the oil outlet of the electric drive system reducer housing, and a second end of the pipe body is adapted to communicate with the inner hole of the electric drive system motor shaft. The chuck is inclined from its fixed end to its free end toward the first end. A rib is provided on the outer circumferential surface of the pipe body. One end of the rib is connected to the fixed end, and the other end of the rib extends toward the first end.

[0005] By employing the above technical solution and adding ribs, the fixed end of the chuck can be strengthened, reducing the risk of chuck breakage. Furthermore, for internal oil guide tubes manufactured using injection molding, the ribs increase the plastic flow path and material replenishment effect, effectively reducing chuck molding defects and thus increasing the yield rate of the internal oil guide tube. In other words, by optimizing the structure of the internal oil guide tube, the possibility of chuck breakage is reduced, and the yield rate of the internal oil guide tube is also improved.

[0006] In one embodiment, the outer side of the tube body is provided with a plurality of protrusions, which are distributed sequentially at intervals in the circumferential direction of the tube body, and a notch is formed between two adjacent protrusions. The outer peripheral side surfaces of the plurality of protrusions are adapted to be interference-fitted with the inner hole of the input shaft of the reducer.

[0007] Using the above technical solution, the internal oil guide tube is usually made of plastic or nylon. Due to its moisture absorption and deformation characteristics, the multiple protrusions on the internal oil guide tube that are used to mate with the inner hole of the reducer input shaft are distributed at intervals to form a petal-shaped structure. This can reduce the contact area between the internal oil guide tube and the inner hole of the reducer input shaft, and reduce the difficulty of matching the internal oil guide tube with the inner hole of the reducer input shaft.

[0008] In one embodiment, the claw is positioned in the circumferential direction of the tube body, corresponding to the position of the notch in the circumferential direction of the tube body; the end of the rib away from the fixed end extends into the notch and connects with the protrusions on both sides of the notch.

[0009] By adopting the above technical solution, the flow path and feeding effect of plastic can be further improved.

[0010] In one embodiment, the thickness of the jaw increases along the axial direction of the tube body from the fixed end to the free end.

[0011] By adopting the above technical solution, the risk of breakage at the root of the chuck can be further reduced.

[0012] In one embodiment, at least two locking claws are provided on the outer side of the tube. The presence of two locking claws allows for a more secure engagement.

[0013] In one embodiment, an annular portion is provided on the outer side of the tube body, and a sealing ring mounting groove is provided on the outer circumferential surface of the annular portion. The sealing ring mounting groove is adapted to install a sealing ring that can form a seal between the annular portion and the input shaft of the reducer.

[0014] By adopting the above technical solution, a sealing barrier is formed by setting an annular part and cooperating with a sealing ring, which can alleviate or solve the problem of backflow and cross-contamination of lubricating oil at the spline of the input shaft of the reducer, and improve the lubrication reliability at the spline of the input shaft of the reducer.

[0015] In one embodiment, an oil groove is provided on the outer peripheral surface of the second end, and a communication port is provided at the second end to connect the oil groove with the inner cavity of the pipe body.

[0016] By adopting the above technical solution, and by setting up an oil groove and a connecting port, the lubricating oil can flow more conveniently from the second end to the connection between the input shaft of the reducer and the motor shaft, thus providing better lubrication to the connection.

[0017] In one embodiment, the internal oil guide tube is an integrally injection-molded part, which is easy to implement.

[0018] Secondly, this application provides an electric drive system, including a reducer housing, a reducer input shaft, a motor shaft, and an internal oil guide pipe as described in any one of the above. The reducer input shaft is connected to the motor shaft, the internal oil guide pipe is installed in the inner hole of the reducer input shaft, a slot is provided in the inner hole of the reducer input shaft, a pawl engages with the slot, the first end communicates with the oil outlet of the reducer housing, and the second end communicates with the inner hole of the motor shaft.

[0019] Using the above technical solution, the internal oil guide pipe guides the lubricating oil from the oil outlet of the reducer housing to the inner hole of the motor shaft, which can lubricate the connection between the reducer input shaft and the motor shaft, as well as the components around the motor shaft.

[0020] Thirdly, this application provides a vehicle including the aforementioned electric drive system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0022] Figure 1 This is a schematic diagram of the internal oil guide pipe disclosed in the embodiments of this application; Figure 2 This is a cross-sectional view of the internal oil guide pipe and the input shaft of the reducer disclosed in the embodiments of this application; Figure 3 This is a side view of the internal oil guide pipe and the input shaft of the reducer disclosed in the embodiments of this application; Figure 4 This is a cross-sectional view of the internal oil guide pipe, the reducer input shaft, and the motor shaft disclosed in the embodiments of this application; Figure 5 This is a cross-sectional view of the electric drive system disclosed in the embodiments of this application; Figure 6 for Figure 5 Enlarged view of the middle section structure; Figure 7 This is a schematic diagram of the structure of some components of the electric drive system disclosed in the embodiments of this application; Figure 8 This is a schematic diagram of the structure of some components of the electric drive system disclosed in the embodiments of this application; Figure 9 This is a schematic diagram of the vehicle structure disclosed in an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures: 1—Inner shaft oil guide pipe; 2—Sealing ring; 3—Reducer input shaft; 4—Motor shaft; 5—Reducer housing; 6—Motor housing; 7—Intermediate housing; 8—Electronic oil pump; 9—Filter; 10—Oil cooler; 11—Oil pipe assembly. 101—Pipe body, 102—First end, 103—Second end, 104—Oil groove, 105—Connecting port, 106—Protrusion, 107—Notch, 108—Recess, 109—Claw, 110—Rib, 111—Annular part, 112—Oil passage 301—First inner hole, 302—Slot, 303—Internal spline 401—Second inner hole, 402—External spline, 501—Oil outlet, 1000—Vehicle, 1001—Electric drive system, 1002—Battery pack, 1003—Controller. Detailed Implementation

[0024] The terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Directional terms used in this application, such as "inner" and "outer," are merely for reference to the orientation shown in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate the orientation of the referred device or component in a practical application scenario.

[0025] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the two parts can rotate relative to each other after connection. "Sliding connection" refers to a connection where the two parts can slide relative to each other after connection.

[0026] The embodiments of this application are described below with reference to the accompanying drawings.

[0027] like Figure 1As shown, this application embodiment provides an internal oil guide pipe 1, including a pipe body 101 and a chuck 109 disposed on the outside of the pipe body 101. The chuck 109 is adapted to engage with the slot 302 in the input shaft 3 of the electric drive system reducer. The first end 102 of the pipe body 101 is adapted to communicate with the oil outlet 501 of the electric drive system reducer housing 5. The second end 103 of the pipe body 101 is adapted to communicate with the inner hole of the electric drive system motor shaft 4. The chuck 109 gradually tilts towards the first end 102 from its fixed end to its free end. A rib 110 is provided on the outer circumferential surface of the pipe body 101. One end of the rib 110 is connected to the fixed end, and the other end of the rib 110 extends towards the first end 102.

[0028] By adopting the above technical solution, the fixed end of the chuck 109 can be strengthened by setting the rib 110, reducing the risk of breakage of the chuck 109. Furthermore, for the internal oil guide tube 1 manufactured by injection molding, the rib 110 can increase the plastic flow path and material replenishment effect, effectively reducing molding defects of the chuck 109, thereby increasing the yield of the internal oil guide tube 1. In other words, by optimizing the structure of the internal oil guide tube 1, the possibility of breakage of the chuck 109 is reduced, and the yield of the internal oil guide tube 1 is also improved.

[0029] In the above technical solution, the pipe body 101 forms an oil passage 112. The opening of the oil passage 112 at the first end 102 is an input port suitable for communicating with the oil outlet 501 of the reducer housing 5 of the electric drive system. The opening of the oil passage 112 at the second end 103 is an output port suitable for communicating with the inner hole of the motor shaft 4.

[0030] In some embodiments, such as Figure 1 and Figure 2 As shown, the outer side of the tube body 101 is provided with a plurality of protrusions 106, which are distributed sequentially and spaced apart in the circumferential direction of the tube body 101. A notch 107 is formed between two adjacent protrusions 106, and the outer peripheral side of the plurality of protrusions 106 is adapted to be interference fit with the first inner hole 301 of the input shaft 3 of the reducer.

[0031] Using the above technical solution, the inner shaft oil guide tube 1 is usually made of plastic or nylon. Due to its moisture absorption and deformation characteristics, the multiple protrusions 106 on the inner shaft oil guide tube 1 that are used to mate with the first inner hole 301 of the reducer input shaft 3 are distributed at intervals to form a petal-shaped structure. This can reduce the contact area between the inner shaft oil guide tube 1 and the first inner hole 301 of the reducer input shaft 3, and reduce the matching difficulty between the inner shaft oil guide tube 1 and the first inner hole 301 of the reducer input shaft 3.

[0032] As a specific example, two protrusions 106 can be provided on the outer side of the tube body 101, and two notches 107 are formed between the two protrusions 106.

[0033] In some embodiments, in order to further reduce the difficulty of matching the plurality of protrusions 106 with the first inner hole 301 of the reducer input shaft 3, a recess 108 is provided on the outer peripheral side surface of the plurality of protrusions 106.

[0034] In some embodiments, the position of the claw 109 in the circumferential direction of the tube body 101 corresponds to the position of the notch 107 in the circumferential direction of the tube body 101; the end of the rib 110 away from the fixed end extends into the notch 107 and connects with the protrusions 106 on both sides of the notch 107.

[0035] By adopting the above technical solution, the flow path and feeding effect of plastic can be further improved.

[0036] In some embodiments, the thickness of the claw 109 in the axial direction of the tube body 101 gradually increases from the fixed end to the free end.

[0037] By adopting the above technical solution, the risk of breakage at the root of the chuck 109 can be further reduced.

[0038] In some embodiments, at least two latches 109 are provided on the outer side of the tube body 101. Providing two latches 109 enables a more secure engagement.

[0039] In some embodiments, an annular portion 111 is provided on the outer side of the tube body 101, and a sealing ring 2 mounting groove is provided on the outer peripheral surface of the annular portion 111. The sealing ring 2 mounting groove is adapted to install a sealing ring 2 that can form a seal between the annular portion 111 and the input shaft 3 of the reducer.

[0040] By adopting the above technical solution, a sealing barrier is formed by setting the annular part 111 and cooperating with the sealing ring 2, which can alleviate or solve the problem of backflow and cross-contamination of lubricating oil at the spline of the reducer input shaft 3, and improve the lubrication reliability at the spline of the reducer input shaft 3. Before assembling the oil guide tube 1 inside the shaft, lubricating oil can be applied to the sealing ring 2 to better achieve the interference fit between the sealing ring 2 and the first inner hole 301 of the reducer input shaft 3.

[0041] In some embodiments, an oil groove 104 is provided on the outer peripheral surface of the second end 103, and a communication port 105 is provided on the second end 103 to connect the oil groove 104 with the inner cavity of the pipe body 101.

[0042] By adopting the above technical solution, and by setting the oil groove 104 and the connecting port 105, the lubricating oil can flow more conveniently from the second end 103 to the connection part between the reducer input shaft 3 and the motor shaft 4, thus forming better lubrication for the connection part.

[0043] In some embodiments, the inner shaft oil guide tube 1 is an integral injection molded part, which is easy to implement.

[0044] like Figures 1 to 8 As shown, this application provides an electric drive system, including a reducer housing 5, a reducer input shaft 3, a motor shaft 4, and an internal oil guide pipe 1 as described in any of the above. The reducer input shaft 3 is connected to the motor shaft 4. The internal oil guide pipe 1 is installed in the first inner hole 301 of the reducer input shaft 3. A slot 302 is provided in the first inner hole 301 of the reducer input shaft 3. A pawl 109 engages with the slot 302. The first end 102 communicates with the oil outlet 501 of the reducer housing 5, and the second end 103 communicates with the second inner hole 401 of the motor shaft 4.

[0045] Using the above technical solution, the inner shaft oil guide pipe 1 guides the lubricating oil from the oil outlet 501 of the reducer housing 5 to the second inner hole 401 of the motor shaft 4, which can lubricate the connection between the reducer input shaft 3 and the motor shaft 4 as well as the components around the motor shaft 4.

[0046] As a specific example, the first end 102 is clearance-fitted with the oil outlet 501 of the reducer housing 5, and the second end 103 is clearance-fitted with the second inner hole 401. An internal spline 303 is provided inside the first inner hole 301 of the reducer input shaft 3, and an external spline 402 is provided at the output end of the motor shaft 4. The internal spline 303 and the external spline 402 mate to achieve the transmission connection between the reducer input shaft 3 and the motor shaft 4. Lubricating oil in the oil passage 112 can flow through the gap between the second end 103 and the second inner hole 401 into the mating area of ​​the internal spline 303 and the external spline 402 for lubrication.

[0047] By setting the pawl 109 and the slot 302, the axial limit of the oil guide pipe 1 inside the shaft can be achieved, preventing contact and unnecessary friction between the first end 102 and the reducer housing 5 and between the second end 103 and the motor shaft 4.

[0048] In actual operation, the electronic oil pump 8 operates according to the controller request of the electric drive system. Lubricating oil enters the electronic oil pump 8 through the housing oil passage, and enters the filter 9 through the housing oil passage from the outlet of the electronic oil pump 8. After being filtered by the filter 9, the lubricating oil enters the oil cooler 10 through the housing oil passage of the motor housing 6 and the intermediate housing 7 via the oil pipe assembly 11. The pipe wall of the oil pipe assembly 11 is designed with oil spray holes to lubricate and cool the friction pairs of the reducer transmission system. After being cooled by the oil cooler 10, the lubricating oil flows out from the oil outlet 501 of the oil cooler 10 and is divided to the motor stator side and the reducer housing 5 side. After flowing out from the oil outlet 501 of the reducer housing 5, the lubricating oil flows directly into the oil passage 112 of the shaft guide oil pipe 1. After flowing out from the end of the oil passage 112, the lubricating oil is divided again to lubricate the spline of the reducer input shaft 3, the motor rotor and the motor rear bearing respectively.

[0049] Among them, the electronic oil pump 8 is the power source for the internal lubrication system of the electric drive, and operates according to the request of the electric drive controller; the filter 9 can filter impurities in the lubrication system to prevent blockage of the lubrication system oil passages; the motor housing 6 and the intermediate housing 7 integrate the lubrication system oil passages and provide mounting points for the electronic oil pump 8, the filter 9, and the oil cooler 10; the oil pipe assembly 11 delivers the filtered lubricating oil to the oil cooler 10, and the pipe wall of the oil pipe assembly 11 is designed with oil spray holes to lubricate the friction pairs of the transmission system; the exterior of the oil cooler 10 is connected to the coolant water pipe, and the interior of the oil cooler 10 is connected to the motor housing 6 and the intermediate housing 7. The housing has interconnected oil passages for cooling and lubricating oil. The internal oil guide tube 1 is hollow and provides lubricating oil to the spline of the reducer input shaft 3, the motor shaft 4, and the rear bearing of the motor. The reducer input shaft 3 is hollow and has an internal spline 303. The reducer input shaft 3 has a groove 302 inside to provide axial positioning for the internal oil guide tube 1 and to transmit motor power to the motor shaft 4 through spline engagement. The reducer housing 5 integrates lubricating oil passages to guide lubricating oil into the internal oil guide tube 1. The motor shaft 4 has an external spline 402 that engages with the internal spline 303 of the reducer input shaft 3 to transmit power.

[0050] like Figure 9 As shown, this application provides a vehicle 1000, including the above-described electric drive system 1001.

[0051] Vehicle 1000 can be, but is not limited to, Pure Electric Vehicle / Battery Electric Vehicle, PEV / BEV, Hybrid Electric Vehicle, HEV, Range Extended Electric Vehicle, REEV, Plug-in Hybrid Electric Vehicle, PHEV, New Energy Vehicle, etc.

[0052] like Figure 9 As shown in this embodiment, an electric drive system 1001 is provided inside the vehicle 1000. The electric drive system 1001 can be located at the bottom, front, or rear of the vehicle 1000 and is used to drive the vehicle 1000. The vehicle 1000 may also include a controller 1003 and a battery pack 1002. The controller 1003 is used to control the operation of the electric drive system 1001, and the battery pack 1002 supplies power to the electric drive system 1001.

[0053] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. An internal oil guide pipe for a shaft, characterized in that, The tube includes a tube body (101) and a pawl (109) disposed on the outside of the tube body (101). The pawl (109) is adapted to engage with a slot (302) in the input shaft (3) of the electric drive system reducer. The first end (102) of the tube body (101) is adapted to communicate with the oil outlet (501) of the electric drive system reducer housing (5). The second end (103) of the tube body (101) is adapted to communicate with the inner hole of the electric drive system motor shaft (4). The pawl (109) is inclined from its fixed end to its free end toward the first end (102). A rib (110) is provided on the outer circumferential surface of the tube body (101). One end of the rib (110) is connected to the fixed end, and the other end of the rib (110) extends toward the first end (102).

2. The shaft internal oil guide pipe according to claim 1, characterized in that, The outer side of the tube body (101) is provided with a plurality of protrusions (106), the plurality of protrusions (106) are distributed sequentially at intervals in the circumferential direction of the tube body (101), a notch (107) is formed between two adjacent protrusions (106), and the outer peripheral side of the plurality of protrusions (106) is adapted to be interference fit with the inner hole of the reducer input shaft (3).

3. The internal oil guide pipe according to claim 2, characterized in that, The claw (109) is positioned in the circumferential direction of the tube body (101) and the notch (107) is positioned in the circumferential direction of the tube body (101); the end of the rib (110) away from the fixed end extends into the notch (107) and connects with the protrusions (106) on both sides of the notch (107).

4. The internal oil guide pipe according to claim 1, characterized in that, From the fixed end to the free end, the thickness of the chuck (109) increases in the axial direction of the tube body (101).

5. The internal oil guide pipe according to claim 1, characterized in that, At least two of the said claws (109) are provided on the outer side of the tube body (101).

6. The internal oil guide pipe according to claim 1, characterized in that, The outer side of the tube body (101) is provided with an annular portion (111), and the outer circumferential surface of the annular portion (111) is provided with a sealing ring (2) mounting groove. The sealing ring (2) mounting groove is suitable for installing a sealing ring (2) that can form a seal between the annular portion (111) and the input shaft (3) of the reducer.

7. The internal oil guide pipe according to claim 1, characterized in that, An oil groove (104) is provided on the outer peripheral surface of the second end (103), and a communication port (105) is provided on the second end (103) to connect the oil groove (104) with the inner cavity of the pipe body (101).

8. The internal oil guide pipe according to claim 1, characterized in that, The inner oil guide pipe (1) is an integral injection molded part.

9. An electric drive system, characterized in that, The device includes a reducer housing (5), a reducer input shaft (3), a motor shaft (4), and an internal oil guide pipe (1) as described in any one of claims 1-8. The reducer input shaft (3) is connected to the motor shaft (4). The internal oil guide pipe (1) is installed in the inner hole of the reducer input shaft (3). A slot (302) is provided in the inner hole of the reducer input shaft (3). The pawl (109) engages with the slot (302). The first end (102) is connected to the oil outlet (501) of the reducer housing (5), and the second end (103) is connected to the inner hole of the motor shaft (4).

10. A vehicle, characterized in that, Includes the electric drive system (1001) as described in claim 9.

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