Oil groove structure for reducing radial friction between electronic oil pump reduction gear shaft and housing bearing structure

Abstract

The utility model relates to oil pump technical field, and disclose an oil tank structure that electronic oil pump reduces gear shaft and radial friction of bearing structure of frame, including gear shaft, the outer wall fixed sleeve of gear shaft one end has outer rotor, the outer wall rotationally connected with frame of outer rotor, the inner wall of frame is set up and located the first oil tank of gear shaft outside, the inner wall of frame is set up and located the second oil tank of outer rotor outside. The utility model discloses through the cooperation between gear shaft, outer rotor, frame and second oil tank, adopts the mode of increasing a circle annular trapezoidal second oil tank, effectively reduces the friction area of oil pump outer rotor and oil well hole, increases the oil film quality and area of the clearance between both, at the same time, the setting of second oil tank makes the second oil tank store a certain amount of oil when the oil pump is full of oil, and there is enough lubricating oil in the second oil tank when the oil pump is short of oil, enough to meet the oil film demand when the oil pump operates.

Description

Technical Field

[0001] This utility model relates to the field of oil pump technology, specifically to an oil groove structure for reducing radial friction between the gear shaft and the machine base bearing structure in an electronic oil pump. Background Technology

[0002] An electric oil pump is an oil pump that is electrically driven, rather than driven by traditional mechanical means, such as gears or belts, like an engine crankshaft.

[0003] However, most of the oil well holes in existing electronic oil pumps on the market are straight grooves that slide with the outer rotor of the cycloidal pump. This structure requires high machining accuracy and surface finish for both the oil well hole wall and the outer circular surface of the outer rotor. In this case, the machining accuracy and surface finish requirements for the existing straight groove shape of the electronic oil pump oil well hole are very high. Furthermore, the traditional straight groove oil well hole is prone to lubricating oil flow interruption under high speed conditions, which causes boundary friction and affects the normal use of the electronic oil pump.

[0004] Meanwhile, existing electronic oil pumps on the market employ various bearing designs, including dual-bearing designs, single-bearing designs using sliding bearings, single-bearing designs using rolling bearings, and designs that rely on a machined shaft hole in the base as the oil pump's single bearing without additional bearing parts. The lubrication design of such bearing structures is particularly important. In the case of existing designs that rely solely on a machined shaft hole in the base as the oil pump's single bearing, if the lubrication structure is not properly implemented, even if the base's A380 material is wear-resistant cast aluminum, it can easily lead to base wear and reduce the oil pump's lifespan. Furthermore, some existing designs with this structure include an annular oil groove for oil storage and lubrication, but without a proper oil guide groove structure, the gear shaft may not be adequately lubricated. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an oil groove structure for reducing radial friction between the gear shaft and the bearing structure of an electronic oil pump. This structure has the advantages of reducing the friction area between the gear shaft and the bearing, increasing the oil film quality and area at the gap between the gear shaft and the bearing, and reducing the friction area between the outer rotor of the oil pump and the well hole, thus solving the problems mentioned in the background art.

[0006] This utility model provides the following technical solution: an oil groove structure for reducing radial friction between the gear shaft and the bearing structure of the base in an electronic oil pump, including a gear shaft, an outer rotor fixedly sleeved on the outer wall of one end of the gear shaft, a base rotatably connected to the outer wall of the outer rotor, a first oil groove located outside the gear shaft on the inner wall of the base, and a second oil groove located outside the outer rotor on the inner wall of the base.

[0007] Preferably, an oil inlet is provided on the left side of the upper end of the base, and an oil outlet is provided on the right side of the lower end of the base.

[0008] Preferably, the second oil groove includes an arc-shaped groove, a first groove and a second groove, the left side of the first groove is connected to the right side of the arc-shaped groove, the right side of the first groove is connected to the left side of the second groove, and the arc-shaped groove, the first groove and the second groove form an annular trapezoidal groove.

[0009] Preferably, the upper flange of the oil inlet is connected to a connecting pipe located on the upper end face of the machine base, a filter plate is fixedly sleeved on the inner wall of the connecting pipe, and a telescopic pipe is connected to the upper flange of the connecting pipe, with a lubricating oil input end connected to the upper end of the telescopic pipe.

[0010] Preferably, a second flange is fixedly installed at the lower end of the connecting pipe, a first flange is movably connected to the lower end of the second flange, a plurality of first fastening bolts are threaded between the second flange and the first flange, a fixing pipe is fixedly installed on the lower end face of the first flange, and the lower end of the fixing pipe is fixedly connected to the upper end of the oil inlet hole, a first sealing ring is installed at the connection between the second flange and the first flange, and the upper end of the connecting pipe is connected to the lower flange of the telescopic pipe.

[0011] Preferably, a third flange is fixedly installed at the upper end of the telescopic pipe, a fourth flange located above the connecting pipe is fixedly installed at the end of the telescopic pipe away from the third flange, a fifth flange is movably connected to the lower end of the fourth flange, and the lower end face of the fifth flange is fixedly connected to the upper end of the connecting pipe. A second sealing ring is provided at the connection between the fourth flange and the fifth flange, and a plurality of second fastening bolts are threaded at the connection between the fourth flange and the fifth flange.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model, through the cooperation between the gear shaft, outer rotor, base, and second oil groove, adopts the method of adding a second oil groove in the shape of an annular trapezoid, which effectively reduces the friction area between the outer rotor of the oil pump and the oil well hole, and increases the oil film quality and area in the gap between them. At the same time, the opening of the second oil groove ensures that when the oil pump is full of oil, a certain amount of oil is stored in the second oil groove, and when the oil pump is short of oil, enough lubricating oil is left in the second oil groove to meet the oil film requirements when the oil pump is running.

[0014] 2. This utility model utilizes the cooperation between the base, the first oil groove, and the gear shaft, and adopts an additional annular first oil groove for oil storage and lubrication. This reduces the friction area between the gear shaft and the base, while also increasing the quality and area of ​​the oil film in the gap between them. When the oil pump is operating under low oil conditions, the first oil groove can meet the lubrication requirements of the gear shaft by relying on the previously stored lubricating oil. Furthermore, the first oil groove is located in the high-pressure outlet area to utilize the high oil pressure of the oil pressure zone to ensure that the annular first oil groove is always full of oil. When the oil pump is operating under low oil conditions, the oil stored in the annular first oil groove will not be lost too quickly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a sectional view of the base of this utility model;

[0017] Figure 3 This is a cross-sectional view of the second oil tank of this utility model;

[0018] Figure 4 This is a cross-sectional view of the first oil tank of this utility model;

[0019] Figure 5 This is a front view of the connecting pipe of this utility model;

[0020] Figure 6 This is a cross-sectional view of the filter plate of this utility model;

[0021] Figure 7 This is a cross-sectional view of the telescopic tube of this utility model.

[0022] In the diagram: 1. Gear shaft; 2. Outer rotor; 3. Base; 4. First oil groove; 5. Second oil groove; 501. Arc groove; 502. First groove; 503. Second groove; 6. Oil inlet; 7. Oil outlet; 8. Connecting pipe; 9. Filter plate; 10. Telescopic pipe; 11. Fixed pipe; 12. First flange; 13. First sealing ring; 14. Second flange; 15. First fastening bolt; 16. Third flange; 17. Fourth flange; 18. Second sealing ring; 19. Fifth flange; 20. Second fastening bolt. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 , Figure 3 and Figure 4 The electronic oil pump features an oil groove structure that reduces radial friction between the gear shaft and the base bearing structure. It includes a gear shaft 1, with an outer rotor 2 fixedly sleeved on the outer wall of one end of the gear shaft 1. The outer wall of the outer rotor 2 is rotatably connected to a base 3. A first oil groove 4, located outside the gear shaft 1, is formed on the inner wall of the base 3. This annular first oil groove 4 is used for oil storage and lubrication, reducing the friction area between the gear shaft 1 and the base 3. It also increases the quality and area of ​​the oil film in the gap between them. When the oil pump is operating under low oil conditions, the first oil groove 4 can meet the lubrication requirements of the gear shaft 1 by relying on the previously stored lubricating oil. Furthermore, the first oil groove 4 is located in the high-pressure outlet area to utilize the high oil pressure of the pressure zone to ensure that the annular first oil groove 4 is always full of oil. During oil operation, the oil stored in the annular first oil groove 4 will not be lost too quickly. The inner wall of the base 3 is provided with a second oil groove 5 located outside the outer rotor 2. Through the cooperation between the gear shaft 1, the outer rotor 2, the base 3 and the second oil groove 5, the opening of the first groove 502, the arc groove 501 and the second groove 503 form an annular trapezoidal groove. By adding an annular trapezoidal second oil groove 5, the friction area between the outer rotor 2 of the oil pump and the oil well hole is effectively reduced, and the oil film quality and area at the gap between them are increased. At the same time, the opening of the second oil groove 5 ensures that when the oil pump is full of oil, a certain amount of oil is stored in the second oil groove 5. When the oil pump is short of oil, enough lubricating oil is left in the second oil groove 5 to meet the oil film requirements when the oil pump is running.

[0025] An oil inlet hole 6 is provided on the left side of the upper end of the base 3, and an oil outlet hole 7 is provided on the right side of the lower end of the base 3.

[0026] Please see Figure 2 and Figure 4 The second oil groove 5 includes an arc-shaped groove 501, a first groove 502 and a second groove 503. The left side of the first groove 502 is connected to the right side of the arc-shaped groove 501, and the right side of the first groove 502 is connected to the left side of the second groove 503. The arc-shaped groove 501, the first groove 502 and the second groove 503 form an annular trapezoidal groove.

[0027] The upper flange of the oil inlet 6 is connected to a connecting pipe 8 located on the upper end face of the base 3. A filter plate 9 is fixedly sleeved on the inner wall of the connecting pipe 8. Since the connecting pipe 8 is installed between the telescopic pipe 10 and the fixed pipe 11, the lubricating oil entering the filter plate 9 will be filtered by the connecting pipe 8, and impurities will remain on the filter plate 9, thereby achieving the removal of impurities from the lubricating oil entering the oil inlet 6. The upper flange of the connecting pipe 8 is connected to the telescopic pipe 10, and the upper end of the telescopic pipe 10 is connected to a lubricating oil input end.

[0028] Please see Figure 5 , Figure 6 and Figure 7 A second flange 14 is fixedly installed at the lower end of the connecting pipe 8. A first flange 12 is movably connected to the lower end of the second flange 14. Several first fastening bolts 15 are threaded between the second flange 14 and the first flange 12. The first fastening bolts 15 are used to connect the connecting pipe 8 and the fixed pipe 11. The fixed pipe 11 is fixedly installed on the lower end face of the first flange 12, and the lower end of the fixed pipe 11 is fixedly connected to the upper end of the oil inlet 6. A first sealing ring 13 is installed at the connection between the second flange 14 and the first flange 12. The first sealing ring 13 is used to seal the connection between the connecting pipe 8 and the fixed pipe 11. The upper end of the connecting pipe 8 is connected to the lower flange of the telescopic pipe 10.

[0029] A third flange 16 is fixedly installed at the upper end of the telescopic pipe 10. A fourth flange 17 located above the connecting pipe 8 is fixedly installed at the end of the telescopic pipe 10 away from the third flange 16. A fifth flange 19 is movably connected to the lower end of the fourth flange 17, and the lower end face of the fifth flange 19 is fixedly connected to the upper end of the connecting pipe 8. A second sealing ring 18 is provided at the connection between the fourth flange 17 and the fifth flange 19. Several second fastening bolts 20 are threadedly connected at the connection between the fourth flange 17 and the fifth flange 19. The second fastening bolts 20 are used to connect the fourth flange 17 and the fifth flange 19.

[0030] Working Principle: In operation, firstly, through the cooperation between the gear shaft 1, outer rotor 2, base 3, and second oil groove 5, the opening of the first groove 502, arc groove 501, and second groove 503 forms an annular trapezoidal groove. By adding an annular trapezoidal second oil groove 5, the friction area between the outer rotor 2 of the oil pump and the oil well hole is effectively reduced, increasing the quality and area of ​​the oil film in the gap between them. At the same time, the opening of the second oil groove 5 ensures that when the oil pump is full of oil, a certain amount of oil is stored in the second oil groove 5. When the oil pump is short of oil, enough lubricating oil is retained from the second oil groove 5 to meet the oil film requirements during oil pump operation. Then, by adding an annular first oil groove 4, oil is stored for lubrication, reducing the friction between the gear shaft 1 and the base 3. The friction area is increased, and the quality and area of ​​the oil film in the gap between the two are also increased. When the oil pump is in a low oil condition, the first oil groove 4 can meet the lubrication film requirements of the gear shaft 1 by relying on the previously stored lubricating oil. In addition, the first oil groove 4 is opened in the high pressure outlet area to ensure that the annular first oil groove 4 is always full of oil by using the high pressure of the oil pressure zone. When the oil pump is in a low oil condition, the oil stored in the annular first oil groove 4 will not be lost too quickly. Finally, since the connecting pipe 8 is installed between the telescopic pipe 10 and the fixed pipe 11, the lubricating oil entering the filter plate 9 will be filtered by the connecting pipe 8, and impurities will be retained on the filter plate 9, thereby achieving the removal of impurities from the lubricating oil entering the oil inlet 6. The oil inlet 6, the second oil groove 5, the first oil groove 4 and the oil outlet 7 are interconnected.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the accompanying drawings of this utility model, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil groove structure for reducing radial friction between the gear shaft and the machine base bearing structure in an electronic oil pump, comprising a gear shaft (1), characterized in that: An outer rotor (2) is fixedly sleeved on the outer wall of one end of the gear shaft (1). The outer wall of the outer rotor (2) is rotatably connected to a base (3). The inner wall of the base (3) is provided with a first oil groove (4) located outside the gear shaft (1). The inner wall of the base (3) is provided with a second oil groove (5) located outside the outer rotor (2). The second oil groove (5) includes an arc groove (501), a first groove (502) and a second groove (503). The left side of the first groove (502) is connected to the right side of the arc groove (501), and the right side of the first groove (502) is connected to the left side of the second groove (503). The arc groove (501), the first groove (502) and the second groove (503) form an annular trapezoidal groove.

2. The oil groove structure for reducing radial friction between the gear shaft and the machine base bearing structure in an electronic oil pump according to claim 1, characterized in that: An oil inlet hole (6) is provided on the left side of the upper end of the base (3), and an oil outlet hole (7) is provided on the right side of the lower end of the base (3).

3. The oil groove structure for reducing radial friction between the gear shaft and the machine base bearing structure in an electronic oil pump according to claim 2, characterized in that: The upper flange of the oil inlet (6) is connected to a connecting pipe (8) located on the upper surface of the base (3). A filter plate (9) is fixedly sleeved on the inner wall of the connecting pipe (8). A telescopic pipe (10) is connected to the upper flange of the connecting pipe (8), and a lubricating oil input end is connected to the upper end of the telescopic pipe (10).

4. The oil groove structure for reducing radial friction between the gear shaft and the machine base bearing structure in an electronic oil pump according to claim 3, characterized in that: The lower end of the connecting pipe (8) is fixedly installed with a second flange (14), the lower end of the second flange (14) is movably connected with a first flange (12), and a number of first fastening bolts (15) are threaded between the second flange (14) and the first flange (12). The lower end face of the first flange (12) is fixedly installed with a fixing pipe (11), and the lower end of the fixing pipe (11) is fixedly connected to the upper end of the oil inlet (6). A first sealing ring (13) is installed at the connection between the second flange (14) and the first flange (12). The upper end of the connecting pipe (8) is connected to the lower flange of the telescopic pipe (10).

5. The oil groove structure for reducing radial friction between the gear shaft and the machine base bearing structure in an electronic oil pump according to claim 4, characterized in that: The upper end of the telescopic pipe (10) is fixedly installed with a third flange (16), and the end of the telescopic pipe (10) away from the third flange (16) is fixedly installed with a fourth flange (17) located above the connecting pipe (8). The lower end of the fourth flange (17) is movably connected with a fifth flange (19), and the lower end face of the fifth flange (19) is fixedly connected to the upper end of the connecting pipe (8). A second sealing ring (18) is provided at the connection between the fourth flange (17) and the fifth flange (19), and several second fastening bolts (20) are threadedly connected at the connection between the fourth flange (17) and the fifth flange (19).

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