Oil pump

Abstract

The utility model provides an oil pump, relates to oil pump technical field, the oil pump includes inner rotor, outer rotor, shell and drive shaft, the shell encloses the rotor cavity, inner rotor is sleeved on the drive shaft, outer rotor is located the outer part of inner rotor and is engaged with inner rotor, and the outer rotor is engaged with the inner rotor. The inner rotor and the outer rotor are both located in the rotor cavity, and a high-pressure cavity is formed between the inner rotor and the outer rotor; the driving shaft is inserted into the shell, the shell is provided with a containing groove, the containing groove surrounds the driving shaft by a circle, a lubricating oil channel is formed in the groove wall of the containing groove in a surrounding mode, and the lubricating oil channel is communicated with the high-pressure cavity. According to the oil pump, the problem that the lubrication effect between the shell and the driving shaft is affected by the uncertainty of the gap between the shell and the driving shaft can be solved.

Description

Technical Field

[0001] This application relates to the field of oil pump technology, and in particular to an oil pump. Background Technology

[0002] Oil pumps are machines used to transport or pressurize liquids, and they are widely used in automobiles, ships, industrial equipment and many other fields.

[0003] In existing oil pumps, a gap exists between the housing and the drive shaft. Lubricating oil inside the housing can flow into this gap to form an oil film, thus lubricating both the drive shaft and the housing. However, errors can occur during the oil pump manufacturing process, resulting in an uncertainty in the gap between the housing and the drive shaft. This can affect the lubrication effect between the housing and the drive shaft. Utility Model Content

[0004] In view of this, this application provides an oil pump to solve the problem that the uncertainty of the gap between the housing and the drive shaft affects the lubrication effect between the housing and the drive shaft.

[0005] This application provides an oil pump, which includes an inner rotor, an outer rotor, a housing, and a drive shaft. The housing encloses a rotor cavity. The inner rotor is sleeved on the drive shaft. The outer rotor is located outside the inner rotor and meshes with the inner rotor. Both the inner rotor and the outer rotor are located within the rotor cavity, and a high-pressure cavity is formed between the inner rotor and the outer rotor.

[0006] The drive shaft is inserted into the housing, and the housing has a receiving groove that surrounds the drive shaft. The groove wall forms a lubricating oil passage that communicates with the high-pressure chamber.

[0007] Preferably, the housing includes a pump body and a pump cover connected together. The pump body includes a groove that is recessed into the pump body from the side of the pump body facing the pump cover. The groove wall surrounds the rotor cavity.

[0008] Preferably, the pump cover has a mounting hole that extends from the surface of the pump cover facing the rotor cavity toward the outside of the rotor cavity, and a portion of the drive shaft is located within the mounting hole;

[0009] The pump body has an extension hole that penetrates the pump body, and a portion of the drive shaft extends out through the extension hole.

[0010] Preferably, the pump cover has the receiving groove, which extends from the wall of the mounting hole along the radial direction of the drive shaft toward the outside of the mounting hole.

[0011] Preferably, the pump cover further includes a recessed portion, which is recessed from the wall of the mounting hole toward the outside of the mounting hole, and the recessed portion surrounds a transfer channel, through which the lubricating oil passage communicates with the high-pressure chamber.

[0012] Preferably, the pump body has the receiving groove, which extends from the wall of the extension hole along the radial direction of the drive shaft toward the outside of the extension hole.

[0013] Preferably, both the pump body and the pump cover are provided with the receiving groove. The receiving groove on the pump body extends from the wall of the extension hole along the radial direction of the drive shaft toward the outside of the extension hole, and the receiving groove on the pump cover extends from the wall of the mounting hole along the radial direction of the drive shaft toward the outside of the mounting hole.

[0014] Preferably, the oil pump further includes fasteners, a portion of the pump cover extends into the rotor cavity, and the pump cover is connected to the pump body via the fasteners.

[0015] Preferably, the oil pump further includes a seal disposed between the cavity wall of the rotor cavity and the portion of the pump body extending into the rotor cavity.

[0016] Preferably, the oil pump further includes a positioning pin, the pump cover has a first positioning hole extending from the side of the pump cover facing the pump body toward a direction away from the pump body, the pump body has a second positioning hole extending from the side of the pump body facing the pump cover toward a direction away from the pump cover, the first positioning hole and the second positioning hole communicate with each other, a portion of the positioning pin is located in the first positioning hole, and the other portion of the positioning pin is located in the second positioning hole.

[0017] Before the oil pump of this application starts, the lubricating oil in the high-pressure chamber can enter the lubrication channel, thereby forming a hydrostatic oil film with a certain pressure in the lubrication channel. This allows the drive shaft to be lifted by the oil film at the moment of pump start-up, avoiding dry friction between the drive shaft and the housing during pump start-up. After the oil pump starts, the drive shaft begins to rotate, and a hydrodynamic oil film is formed in the lubrication channel, separating the housing from the drive shaft by the hydrodynamic oil film. Thus, the lubrication channel formed by the housing's receiving groove ensures that an oil film can be formed in the lubrication channel both at the moment of pump start-up and during operation, reducing the impact of the uncertainty of the clearance between the housing and the drive shaft on the lubrication effect between the housing and the drive shaft, and ensuring the lubrication effect between the housing and the drive shaft. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the planar structure of the oil pump is shown;

[0020] Figure 2 Show Figure 1 A cross-sectional view of the oil pump in the middle, obtained by cutting along A-A'.

[0021] Figure 3 A schematic diagram of the pump cover structure is shown;

[0022] Figure 4 Show Figure 3 An enlarged view of part B in the image;

[0023] Figure 5 A schematic diagram of the pump body is shown;

[0024] Figure 6 The diagram shows the relative positions of the inner and outer rotors.

[0025] Icons: 1-Housing; 11-Pump body; 12-Pump cover; 13-Receiving groove; 14-Recess; 15-Housing hole; 16-Extension hole; 17-Groove; 18-First positioning hole; 19-Second positioning hole; 2-Inner rotor; 3-Outer rotor; 4-Drive shaft; 5-Fastener; 6-Seal; 7-Positioning pin; 81-High pressure chamber; 82-Low pressure chamber; 91-Bushing; 92-Crescent plate. Detailed Implementation

[0026] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0027] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0028] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0029] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0030] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0031] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0034] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0035] This application provides an oil pump, such as Figures 1 to 6 As shown, the oil pump includes an inner rotor 2, an outer rotor 3, a housing 1, and a drive shaft 4. The housing 1 encloses a rotor cavity. The inner rotor 2 is mounted on the drive shaft 4, and the outer rotor 3 is located outside the inner rotor 2 and meshes with it. Both the inner rotor 2 and the outer rotor 3 are located within the rotor cavity, and a high-pressure chamber 81 is formed between them. The drive shaft 4 is inserted into the housing 1, which has a receiving groove 13 that surrounds the drive shaft 4. The groove wall of the receiving groove 13 forms a lubricating oil passage, which communicates with the high-pressure chamber 81. Before the oil pump starts, the lubricating oil in the high-pressure chamber 81 can enter the lubricating oil passage, forming a hydrostatic oil film with a certain pressure. This allows the drive shaft 4 to be lifted by the oil film at the moment of pump startup, preventing dry friction between the drive shaft 4 and the housing 1 during pump startup. After the oil pump starts, the drive shaft 4 begins to rotate, forming a hydrodynamic oil film in the lubricating oil passage, which separates the housing 1 from the drive shaft 4. Thus, the lubricating oil passage formed by the receiving groove 13 of the housing 1 enables the oil pump to form an oil film in the lubricating oil passage at the moment of startup and during operation, reducing the impact of the uncertainty of the gap between the housing 1 and the drive shaft 4 on the lubrication effect between the housing 1 and the drive shaft 4, and ensuring the lubrication effect between the housing 1 and the drive shaft 4.

[0036] Furthermore, the oil film formed in the lubrication channels lubricates the housing 1 and the drive shaft 4, reducing the precision requirements for the oil pump's manufacturing. With the drive shaft 4 and housing 1 separated by the oil film, the resistance comes only from the viscosity of the lubricating oil, reducing wear between them and thus extending the oil pump's lifespan and lowering maintenance costs. Simultaneously, the drive shaft 4 experiences more uniform stress, resulting in a more uniform temperature distribution, which reduces the impact of thermal expansion.

[0037] In the embodiments of this application, such as Figure 1 and Figure 5 As shown, the housing 1 includes a pump body 11 and a pump cover 12 connected to each other. The pump body 11 includes a groove 17, which is recessed into the pump body 11 from the side facing the pump cover 12. The groove wall of the groove 17 surrounds a rotor cavity so that the inner rotor 2 and the outer rotor 3 can be disposed within the rotor cavity. Figure 6 As shown, a crescent plate 92 is provided inside the rotor cavity, and the crescent plate 92 is located between the inner rotor 2 and the outer rotor 3 to divide the space between the inner rotor 2 and the outer rotor 3 into a high-pressure chamber 81 and a low-pressure chamber 82.

[0038] Furthermore, such as Figure 1 and Figure 2 As shown, the oil pump also includes fasteners 5. A portion of the pump cover 12 extends into the rotor cavity. The fasteners 5 pass through the pump cover 12 from the side of the pump cover 12 opposite to the pump body 11 and then into the pump body 11, where they are threaded together. This secures the pump cover 12 and the pump body 11 together with the fasteners 5. Multiple fasteners 5 can be installed at different positions on the pump cover 12 to ensure the stability of the installation between the pump body 11 and the pump cover 12. Optionally, the fasteners 5 can be bolts.

[0039] like Figure 2 , Figure 3 and Figure 5 As shown, the oil pump also includes a positioning pin 7. The pump cover 12 has a first positioning hole 18, which extends from the side of the pump cover 12 facing the pump body 11 away from the pump body 11. The pump body 11 has a second positioning hole 19, which extends from the side of the pump body 11 facing the pump cover 12 away from the pump cover 12. The first positioning hole 18 and the second positioning hole 19 communicate with each other. Part of the positioning pin 7 is located in the first positioning hole 18, and the other part of the positioning pin 7 is located in the second positioning hole 19. Before installing the pump body 11 and the pump cover 12, the positioning of the pump body 11 and the pump cover 12 can be achieved by the cooperation of the first positioning hole 18, the second positioning hole 19, and the positioning pin 7, thereby improving the ease of installation between the pump body 11 and the pump cover 12.

[0040] In addition, the oil pump also includes a seal 6, which is disposed between the cavity wall of the rotor cavity and the portion of the pump body 11 that extends into the rotor cavity, thereby achieving a seal between the pump body 11 and the pump cover 12. Optionally, the seal 6 can be a sealing ring.

[0041] In the embodiments of this application, such as Figure 3 and Figure 5 As shown, the pump cover 12 has a mounting hole 15, which extends from the surface of the pump cover 12 toward the rotor cavity toward the outside of the rotor cavity. A portion of the drive shaft 4 is located inside the mounting hole 15. The pump body 11 has an extension hole 16, which penetrates the pump body 11. A portion of the drive shaft 4 extends out through the extension hole 16. A bushing 91 can be provided between the drive shaft 4 and the hole wall of the extension hole 16.

[0042] like Figure 3 and Figure 4 As shown, a receiving groove 13 is formed on the pump cover 12. The receiving groove 13 extends from the wall of the mounting hole 15 along the radial direction of the drive shaft 4 toward the outside of the mounting hole 15. The receiving groove 13 extends around the wall of the mounting hole 15 to form an annular lubricating oil passage. In this way, the lubricating oil in the high-pressure chamber 81 can enter the lubricating oil passage on the pump cover 12 to form a hydrostatic oil film. At the moment the oil pump starts, the drive shaft 4 is lifted by the oil film, and after the oil pump starts, a hydrodynamic oil film is formed in the lubricating oil passage.

[0043] Furthermore, the pump cover 12 also includes a recess 14, which is recessed from the wall of the mounting hole 15 toward the outside of the mounting hole 15. The recess 14 forms a transfer channel, through which the lubricating oil passage is connected to the high-pressure chamber 81. In this way, the lubricating oil in the high-pressure chamber 81 can enter the lubricating oil passage through the transfer channel.

[0044] Preferably, the recess 14 extends along the axial direction of the drive shaft 4 to cover the receiving groove 13, and the position of the recess 14 corresponds to the high pressure chamber 81 to ensure that the oil in the high pressure chamber 81 can enter the lubrication passage.

[0045] Optionally, the location of the receiving groove 13 is not limited to the pump cover 12; the receiving groove 13 can also be formed on the pump body 11. In this case, the receiving groove 13 extends from the wall of the extension hole 16 along the radial direction of the drive shaft 4 toward the outside of the extension hole 16. The groove wall of the receiving groove 13 can enclose a lubricating oil passage, so that the lubricating oil in the high-pressure chamber 81 can enter the lubricating oil passage on the pump body 11 to form a hydrostatic oil film. At the moment the oil pump starts, the drive shaft 4 is lifted by the oil film, and after the oil pump starts, a dynamic pressure oil film is formed in the lubricating oil passage. When the receiving groove 13 is formed on the pump body 11, the bushing 91 may not be provided between the drive shaft 4 and the pump body 11. The pump body 11 may also have a recess 14 that can enclose a transfer channel, so that the lubricating oil passage on the pump body 11 is connected to the high-pressure chamber 81 through the transfer channel.

[0046] Furthermore, the number of receiving grooves 13 is not limited to one; there can also be two, meaning that receiving grooves 13 are provided on both the pump body 11 and the pump cover 12. The receiving groove 13 on the pump body 11 extends from the wall of the extension hole 16 along the radial direction of the drive shaft 4 toward the outside of the extension hole 16, and the receiving groove 13 on the pump cover 12 extends from the wall of the mounting hole 15 along the radial direction of the drive shaft 4 toward the outside of the mounting hole 15. The lubricating oil in the high-pressure chamber 81 can enter the two lubricating oil passages to form a hydrostatic oil film. At the moment the oil pump starts, the drive shaft 4 is lifted by the oil film in the two lubricating oil passages. After the oil pump starts, a dynamic pressure oil film is formed in the two lubricating oil passages.

[0047] The receiving groove 13 on the housing 1 of the oil pump of this application can form a lubricating oil passage, so that an oil film can be formed in the lubricating oil passage at the moment of start-up and during operation, thus ensuring the lubrication effect between the housing 1 and the drive shaft 4.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An oil pump, characterized in that, The oil pump includes an inner rotor, an outer rotor, a housing, and a drive shaft. The housing encloses a rotor cavity. The inner rotor is sleeved on the drive shaft. The outer rotor is located outside the inner rotor and meshes with the inner rotor. Both the inner rotor and the outer rotor are located within the rotor cavity. A high-pressure cavity is formed between the inner rotor and the outer rotor. The drive shaft is inserted into the housing, and the housing has a receiving groove that surrounds the drive shaft. The groove wall forms a lubricating oil passage that communicates with the high-pressure chamber.

2. The oil pump according to claim 1, characterized in that, The housing includes a pump body and a pump cover connected together. The pump body includes a groove that is recessed into the pump body from the side of the pump body facing the pump cover. The groove wall surrounds the rotor cavity.

3. The oil pump according to claim 2, characterized in that, The pump cover has a mounting hole that extends from the surface of the pump cover facing the rotor cavity toward the outside of the rotor cavity, and a portion of the drive shaft is located within the mounting hole. The pump body has an extension hole that penetrates the pump body, and a portion of the drive shaft extends out through the extension hole.

4. The oil pump according to claim 3, characterized in that, The pump cover has the receiving groove, which extends from the wall of the mounting hole along the radial direction of the drive shaft toward the outside of the mounting hole.

5. The oil pump according to claim 4, characterized in that, The pump cover also includes a recessed portion, which is recessed from the wall of the mounting hole toward the outside of the mounting hole. The recessed portion encloses a transfer channel, and the lubricating oil passage is connected to the high-pressure chamber through the transfer channel.

6. The oil pump according to claim 3, characterized in that, The pump body is provided with the receiving groove, which extends from the wall of the extension hole along the radial direction of the drive shaft toward the outside of the extension hole.

7. The oil pump according to claim 3, characterized in that, Both the pump body and the pump cover are provided with receiving grooves. The receiving groove on the pump body extends from the wall of the extension hole along the radial direction of the drive shaft toward the outside of the extension hole, and the receiving groove on the pump cover extends from the wall of the mounting hole along the radial direction of the drive shaft toward the outside of the mounting hole.

8. The oil pump according to any one of claims 2-7, characterized in that, The oil pump also includes fasteners, and a portion of the pump cover extends into the rotor cavity. The pump cover is connected to the pump body via the fasteners.

9. The oil pump according to any one of claims 2-7, characterized in that, The oil pump also includes a seal disposed between the cavity wall of the rotor cavity and the portion of the pump body extending into the rotor cavity.

10. The oil pump according to any one of claims 2-7, characterized in that, The oil pump also includes a positioning pin. The pump cover has a first positioning hole that extends from the side of the pump cover facing the pump body toward a direction away from the pump body. The pump body has a second positioning hole that extends from the side of the pump body facing the pump cover toward a direction away from the pump cover. The first positioning hole and the second positioning hole are in communication. A portion of the positioning pin is located in the first positioning hole, and the other portion of the positioning pin is located in the second positioning hole.

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