A spiral oil pump and compressor

Abstract

This utility model discloses a spiral oil pump and a compressor. The spiral oil pump is rotatably connected within the crankshaft of the compressor and includes: an oil guide component and an oil supply protection component. The oil guide component supplies oil; the oil supply protection component protects the oil guide component. The crankshaft includes a crankshaft body and an oil supply channel for supplying oil. One end of the oil supply protection component is connected to the oil supply channel, and the other end extends into the oil reservoir of the compressor. One end of the oil guide component is connected to the oil supply channel, and the other end is connected to the side of the oil supply protection component near the oil reservoir. The oil supply channel has a first mounting position, and the oil supply protection component has a first connecting portion connected to the first mounting position. This application adopts a closed-loop oil delivery structure design, which improves the compressor's suction efficiency at low liquid levels, enhances the reliability of the spiral oil pump, and extends the compressor's service life.

Description

Technical Field

[0001] This utility model relates to the technical field of oil pumps, and in particular to a spiral oil pump and a compressor using the spiral oil pump. Background Technology

[0002] A scroll compressor is a device that uses a positive displacement compression mechanism. Its core component is a scroll pair consisting of a moving scroll and a stationary scroll. During compression, the moving scroll revolves relative to the stationary scroll, forming a series of gradually decreasing closed volumes. The continuous change of these closed volumes enables the intake, compression, and discharge of gas, ultimately achieving the purpose of compressing the gas. To ensure effective sealing between the moving and stationary scrolls, their contact surfaces are sealed through a sliding friction pair. Appropriate lubricating oil needs to be injected into the sliding friction pair to reduce wear and improve efficiency.

[0003] In existing technologies, scroll compressors mainly use gear oil pumps and centrifugal oil supply methods. Centrifugal oil supply relies on the large centrifugal force generated by the rotation of the helical blades to deliver lubricating oil to the various friction pairs of the compressor. However, current helical blade designs often involve mounting the helical blades inside the crankshaft with only a small portion or most of them exposed outside the crankshaft. The former design requires an extended crankshaft at low oil levels, increasing material usage and processing costs. It also demands higher parallelism and coaxiality during assembly, further increasing costs. The latter design carries the risk of loose fit, which increases at high speeds. Utility Model Content

[0004] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the purpose of this invention is to provide a spiral oil pump and compressor that improves the compressor's suction efficiency at low liquid levels, enhances the reliability of the spiral oil pump, and extends the compressor's service life.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A spiral oil pump, rotatably connected within the crankshaft of a compressor, includes: Oil guide components are used for oil supply; An oil supply protection component is provided to protect the oil guide component. The crankshaft includes a crankshaft body and an oil supply channel for supplying oil. One end of the oil supply protection component is connected to the oil supply channel, and the other end extends into the oil reservoir of the compressor. One end of the oil guide component is connected to the oil supply channel, and the other end is connected to the side of the oil supply protection component near the oil reservoir. The oil supply channel is provided with a first mounting position, and the oil supply protection component is provided with a first connecting part, which is connected to the first mounting position.

[0006] The beneficial effects of this utility model are as follows: This application adopts a closed oil delivery structure design. Firstly, the oil guide and oil supply protection components are integrated into the oil supply channel inside the crankshaft, eliminating the need to lengthen the crankshaft or expose most of it externally. This avoids the increased material and processing costs and the excessively high requirements for assembly coaxiality and parallelism caused by an excessively long crankshaft. It also overcomes the defects of exposed oil guide components leading to loose fit and increased risks during high-speed operation, thus enhancing the reliability and stability of the spiral oil pump. Secondly, the oil supply protection component extends into the oil reservoir, completely sealing the part of the oil guide component that may be splashed during operation, effectively preventing lubricating oil from being splashed out during delivery and improving the suction efficiency. Thirdly... By reasonably extending the extension length of the oil guide and oil supply protection components, low-level oil can be effectively drawn in, allowing the compressor to provide sufficient head and oil supply even at low speeds. This ensures that all friction pairs are always adequately lubricated, avoiding abnormal wear caused by insufficient oil, improving the compressor's drawing efficiency at low liquid levels, and extending the compressor's service life. Fourthly, the oil supply protection component is connected to the first mounting position in the oil supply channel through the first connecting part, ensuring reliable fixing of the oil supply protection component and the crankshaft. This ensures a tight fit between the two at the connection point, preventing leakage gaps and effectively reducing oil leakage losses during transportation, thus improving the overall oil delivery efficiency and reliability of the spiral oil pump.

[0007] As described above, in a spiral oil pump, along the length of the oil guide member, both sides of the oil guide member are respectively interference-fitted with the oil supply channel and the oil supply protection member.

[0008] As described above, in a spiral oil pump, the oil guide component has a first spiral portion and a second spiral portion. The diameter of the first spiral portion is a first diameter D1, and the diameter of the second spiral portion is a second diameter D2. The first diameter D1 is larger than the diameter of the oil supply channel, and the second diameter D2 is larger than the diameter of the oil supply protection component.

[0009] As described above, in a spiral oil pump, along the length of the oil guide member, the oil guide member has an extension portion extending out of the oil supply channel and a first embedded portion embedded in the oil supply channel. The oil supply protection member has a second embedded portion embedded in the oil supply channel. The maximum length of the extension portion is a first length L1, the maximum length of the first embedded portion is a second length L2, and the maximum length of the second embedded portion is a third length L3; satisfying: L2=1 / 2L1, L3=1 / 3L2.

[0010] In the spiral oil pump described above, along the length direction of the oil guide member, the maximum length of the first spiral section is the fourth length L4, which satisfies: L4 = 1 / 3L1.

[0011] As described above, in a spiral oil pump, the oil supply protection component is further provided with a first inclined portion for stabilizing oil supply, the first inclined portion being disposed on the side of the oil supply protection component away from the first connecting portion.

[0012] As described above, in a spiral oil pump, the oil supply channel has a first channel and a second channel that are connected to each other. The diameter of the second channel is smaller than that of the first channel, and the first mounting position is located on the inner wall of the first channel.

[0013] As described above, a spiral oil pump further includes a second inclined section between the first channel and the second channel for guiding flow.

[0014] As described above, in a spiral oil pump, the oil supply protection component is provided with at least two first connecting parts, and a plurality of first connecting parts are connected in the first mounting position.

[0015] The present invention provides a compressor comprising a spiral oil pump, a housing, and an oil reservoir as described above. The crankshaft is rotatably connected to the housing, and the oil reservoir is connected to the housing and spaced apart from the spiral oil pump. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the structure installed inside the machine body according to an embodiment of the present invention; Figure 2 For the corresponding Figure 1 Enlarged view of the A-section structure; Figure 3 This is a partial cross-sectional view of the oil supply assembly connected to the crankshaft according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the oil guide component according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the oil supply protection component according to an embodiment of the present utility model; Figure 6 For the corresponding Figure 5 A structural diagram from another direction.

[0017] Reference numerals: 1-crankshaft, 11-crankshaft body, 12-oil supply channel, 121-first mounting position, 122-first channel, 123-second channel, 124-second inclined portion; 2-engine body; 3-oil supply assembly, 31-oil guide, 311-first spiral portion, 312-second spiral portion, 32-oil supply protection component, 321-first connecting portion, 323-first inclined portion; 4-oil reservoir; 5-lower bracket. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] In the description of this application, if words such as several, greater than, less than, exceeding, above, below, or within appear, "several" means one or more, "more than" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, and "above," "below," "within," etc. are understood to include the number itself.

[0021] In the description of this application, the use of terms such as "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] like Figures 1-6 As shown in the figure, an embodiment of the present invention provides a spiral oil pump, which is rotatably connected within the crankshaft 1 of a compressor, and includes: The crankshaft 1 includes a crankshaft body 11 and an oil supply channel 12 for supplying oil. One end of the oil supply protection component 32 is connected to the oil supply channel 12, and the other end extends into the oil reservoir 4 of the compressor. One end of the oil guide component 31 is connected to the oil supply channel 12, and the other end is connected to the side of the oil supply protection component 32 near the oil reservoir 4. The oil supply channel 12 is provided with a first mounting position 121, and the oil supply protection component 32 is provided with a first connecting part 321, which is connected to the first mounting position 121.

[0024] In this embodiment of the utility model, the oil guide 31 is a spiral blade structure surrounding the central shaft. The crankshaft 1 is rotatably connected to the drive motor installed in the compressor. The crankshaft 1 drives the oil guide 31 to rotate synchronously, so that the oil guide 31 delivers lubricating oil from bottom to top, and then delivers the lubricating oil in the oil reservoir 4 to each friction pair, ensuring that each friction pair is always fully lubricated, thereby extending the service life of the compressor.

[0025] In this embodiment of the utility model, the oil guide 31 and the oil supply protection component 32 are integrated into the oil supply channel 12 inside the crankshaft. This eliminates the need to lengthen the crankshaft 1 as a whole or expose most of it to the outside. This avoids the problems of increased material and processing costs and excessively high requirements for assembly coaxiality and parallelism caused by an excessively long crankshaft 1. It also overcomes the defects of the exposed oil guide 31 leading to loose fit and increased risk during high-speed operation, thereby enhancing the reliability and stability of the spiral oil pump.

[0026] In this embodiment of the utility model, the oil supply protection component 32 is extended into the oil reservoir 4, so that the part of the oil guide component 31 that may be splashed with oil during operation is completely wrapped and sealed, effectively preventing the lubricating oil from being splashed out during the transportation process and improving the absorption efficiency.

[0027] In this embodiment of the invention, by reasonably lengthening the extension length of the oil guide 31 and the oil supply protection component 32, the oil at low liquid levels can be effectively drawn in, so that the compressor can still provide sufficient head and oil supply under low speed conditions, ensuring that each friction pair is always adequately lubricated, avoiding abnormal wear caused by lack of oil, improving the compressor's drawing efficiency at low liquid levels and extending the compressor's service life.

[0028] In this embodiment of the utility model, the oil supply protection component 32 is connected to the first mounting position 121 in the oil supply channel 12 through the first connecting part 321, which prevents the oil supply protection component 32 from shifting or shaking due to vibration or oil flow impact, and ensures the reliable fixation of the oil supply protection component 32 and the crankshaft 1, so that the two fit tightly at the connection and are not prone to leakage gaps, effectively reducing the leakage loss of lubricating oil during the transportation process, and improving the overall oil delivery efficiency and reliability of the spiral oil pump.

[0029] like Figures 1-3 As shown, specifically, along the length of the oil guide 31, both sides of the oil guide 31 are interference-fitted with the oil supply channel 12 and the oil supply protection component 32, respectively.

[0030] Preferably, the oil guide 31 is integrally molded from hydrogenated nitrile rubber (HNBR) or fluororubber (FKM) so that both sides of the oil guide 31 can be interference-fitted with the oil supply channel 12 and the oil supply protection component 32 respectively, improving the stability of the connection. The interference-fit connection between the oil guide 31 and the oil supply channel 12 ensures that a static seal is formed between the oil outlet end of the oil guide 31 and the oil supply channel 12, preventing high-pressure oil from leaking from here and enhancing the sealing performance of the spiral oil pump. The interference-fit connection between the oil guide 31 and the oil supply protection component 32 not only fixes the oil inlet end of the oil guide 31, but also forms a dynamic sealing and support interface inside the oil supply protection component 32, keeping the oil guide 31 stable within the oil supply protection component 32, while ensuring that the lubricating oil is completely transported through the spiral channel of the oil guide 31, avoiding leakage loss of lubricating oil during the transportation process, and improving the overall oil delivery efficiency and reliability of the spiral oil pump.

[0031] like Figure 4 As shown, the oil guide 31 is further provided with a first spiral part 311 and a second spiral part 312. The diameter of the first spiral part 311 is a first diameter D1, and the diameter of the second spiral part 312 is a second diameter D2. The first diameter D1 is larger than the diameter of the oil supply channel 12, and the second diameter D2 is larger than the diameter of the oil supply protection part 32.

[0032] In this embodiment of the invention, both the first spiral section 311 and the second spiral section 312 are spiral blade structures surrounding the central axis, ensuring that the lubricating oil is completely transported through the spiral channel of the oil guide 31, thereby improving oil delivery efficiency. The oil guide 31 of this invention adopts a variable diameter structure design, with the first spiral section 311 connected to the second spiral section 312 via a variable diameter section. Furthermore, the first spiral section 311 and the second spiral section 312 have the same helix angle, facilitating smoother operation of the spiral oil pump when drawing lubricating oil. The first diameter D1 is larger than the oil supply channel. The diameter of D2 ensures that the first spiral part 311 can fully contact the lubricating oil in the oil supply channel 12 and form an effective sealing cavity, preventing lubricating oil leakage in the oil supply channel 12 and improving the suction efficiency; the second diameter D2 is larger than the diameter of the oil supply protection component 32, ensuring that the second spiral part 312 can fully contact the lubricating oil in the oil supply protection component 32 and form an effective sealing cavity, preventing lubricating oil leakage in the oil supply protection component 32, effectively enhancing the sealing performance of the connection between the spiral oil pump and the oil supply channel 12, and improving the suction efficiency of the spiral oil pump.

[0033] In some embodiments, the first helical section 311 may employ a larger helix angle to enhance oil suction capacity, while the second helical section 312 may employ a smaller helix angle to provide higher output pressure, thereby improving the oil delivery efficiency of the spiral oil pump.

[0034] like Figure 3As shown, further, along the length direction of the oil guide 31, the oil guide 31 is provided with an extension extending out of the oil supply channel 12 and a first embedded part embedded in the oil supply channel 12, and the oil supply protection member 32 is provided with a second embedded part embedded in the oil supply channel 12. The maximum length of the extension is the first length L1, the maximum length of the first embedded part is the second length L2, and the maximum length of the second embedded part is the third length L3; satisfying L2=1 / 2L1, L3=1 / 3L2.

[0035] In this embodiment of the utility model, the structural design of L2=1 / 2L1 and L3=1 / 3L2, based on the maximum length of the protrusion and ensuring that the spiral oil pump can still maintain maximum effective operation when the oil reservoir 4 is at a low liquid level, allows the depth of the oil guide 31 embedded in the crankshaft 1 to ensure that the oil supply protection component 32 has sufficient stable length for matching, thereby enhancing the stability of the spiral oil pump during operation and improving the suction efficiency of the spiral oil pump when the liquid level is low.

[0036] like Figure 3 As shown, further, along the length direction of the oil guide 31, the length of the first spiral part 311 is the fourth length L4, which satisfies L4=1 / 3L1.

[0037] In this embodiment of the utility model, under the premise of avoiding affecting the connection between the first connecting part 321 and the first mounting position 121, the first spiral part 311 and the oil supply channel 12 form an effective sealing cavity to prevent lubricating oil from leaking in the oil supply channel 12 and improve the absorption efficiency.

[0038] like Figure 5 As shown, the oil supply protection component 32 is further provided with a first inclined portion 323 for stabilizing oil supply. The first inclined portion 323 is provided on the side of the oil supply protection component 32 away from the first connecting portion 321.

[0039] In this embodiment of the invention, the oil supply protection component 32 is designed as a tubular structure. The angle between the first inclined portion 323 and the central axis of the oil supply protection component 32 can be between 30° and 60°. When the angle is less than 30°, the first inclined portion 323 is too gentle, approaching a straight cylinder. When the oil level in the oil reservoir 4 drops or the compressor tilts, the inlet flow channel of the oil supply protection component 32 converges gently, resulting in weak guiding and accelerating effect on the lubricating oil, which is not conducive to reducing suction resistance. When the angle is greater than 30°, the first inclined portion 323 is too steep, approaching the chamfer of a right-angled platform. Although it can quickly expose the oil surface, it may produce sharp edges. This causes the lubricating oil to suddenly contract and separate at this point, which increases flow resistance and turbulence, and may cause cavitation, which is not conducive to the delivery of lubricating oil by the oil guide 31. When the included angle is 30°~60°, the first inclined part 323 forms an effective "flow guide bell mouth", which allows the lubricating oil to be guided more smoothly from all directions into the interior of the oil supply protection part 32, significantly reducing eddies, flow separation and local pressure loss at the inlet, reducing the negative pressure required for pump suction, and making it easier for the spiral blades of the oil guide 31 to deliver lubricating oil, especially at low oil levels or during startup, thereby improving the suction efficiency of the spiral oil pump.

[0040] like Figures 1-3 As shown, the oil supply channel 12 further includes a first channel 122 and a second channel 123 that are connected to each other. The diameter of the second channel 123 is smaller than that of the first channel 122. The first mounting position 121 is located on the inner wall of the first channel 122.

[0041] In this embodiment of the present invention, the first channel 122 and the second channel 123 adopt a stepped variable diameter structure design. The first channel 122 has a larger diameter, which facilitates the first connecting part 321 of the oil supply protection component 32 to be inserted into the first channel 122 and fixed in the first mounting position 121, so as to provide sufficient space to achieve interference fit and sealing. The second channel 123 has a smaller diameter and is the main passage for lubricating oil to flow to each friction pair. After the lubricating oil enters the second channel 123, it is accelerated and then transported to each friction pair, thereby improving the conveying efficiency of the spiral oil pump.

[0042] like Figures 1-3 As shown, a second inclined section 124 for guiding flow is further provided between the first channel 122 and the second channel 123.

[0043] In this embodiment of the present invention, the second inclined portion 124 is located between the first channel 122 and the second channel 123, and the second inclined portion 124 adopts a conical structure design. After the lubricating oil is pumped out from the oil guide 31 and enters the space of the first channel 122, the flow rate of the lubricating oil is relatively slow. Through the conical convergence of the second inclined portion 124, the lubricating oil is smoothly accelerated and guided into the second channel 123, avoiding the generation of severe eddies, flow separation or local low pressure areas at the abrupt change in diameter of the lubricating oil. This helps to reduce the flow loss of the lubricating oil, maintain the stability of the oil pressure, and thus ensure that the lubricating oil can be smoothly delivered to each friction pair, thereby enhancing the stability of the spiral oil pump's oil delivery.

[0044] like Figures 5-6 As shown, the oil supply protection component 32 is further provided with at least two first connecting parts 321, and multiple first connecting parts 321 are connected to the first mounting position 121.

[0045] In this embodiment of the present invention, the first mounting position 121 is an annular groove provided on the inner wall of the oil supply channel 12, and the first connecting part 321 is a protrusion extending outward from the oil guide 31. The first connecting part 321 is inserted into the first mounting position 121 so that the oil supply protection component 32 is stably connected in the oil supply channel 12, thereby improving the stability of the spiral oil pump during operation. Preferably, there are two first connecting parts 321, which are arranged opposite to each other on both sides of the oil supply protection component 32 to reduce the frictional resistance during installation of the first connecting parts 321, thereby improving the stability of the connection of the oil supply protection component 32 and the ease of installation.

[0046] Preferably, in order to improve the smoothness of the installation of the oil supply protection component 32, the side of the first connecting part 321 that contacts the oil supply channel 12 is an inclined surface, so as to ensure that it can be smoothly inserted into the first mounting position 121 and reset by the guiding effect of the inclined surface, thereby improving the ease of installation of the oil supply protection component 32; at the same time, the inclined surface structure design improves the ease of disassembly of the first connecting part 321, facilitates later maintenance, and extends the service life of the spiral oil pump.

[0047] like Figures 1-2 As shown in the figure, the compressor provided by this utility model includes a spiral oil pump, a body 2, and an oil reservoir 4 as described above. The crankshaft 1 is rotatably connected inside the body 2; the oil reservoir 4 is connected to the body 2 and is spaced apart from the spiral oil pump.

[0048] In this embodiment of the present invention, the drive motor is fixed on the side of the machine body 2 away from the oil reservoir 4, and the crankshaft 1 is rotatably connected to the drive motor, thereby driving the oil guide 31 and the oil supply protection component 32 to rotate synchronously to draw lubricating oil; the compressor also includes a lower bracket 5, which is fixedly connected to the outer side of the end of the crankshaft 1 to prevent the crankshaft 1 from generating excessive deflection, vibration or end swing under high-speed rotation and lateral gas force, thereby enhancing the stability of the oil supply from the spiral oil pump.

[0049] In this embodiment of the utility model, the oil reservoir 4 is connected to the machine body 2 and is spaced apart from the spiral oil pump to ensure that the spiral oil pump will not interfere with the oil reservoir 4 during the oil delivery process, thereby enhancing the safety of the oil delivery process; the oil reservoir 4 and the machine body 2 adopt a detachable structural design to improve the convenience of later maintenance and adding lubricating oil.

[0050] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A screw oil pump which is rotatably connected to a crankshaft of a compressor, characterized in that, include: Oil guide components are used for oil supply; An oil supply protection component is provided to protect the oil guide component. The crankshaft includes a crankshaft body and an oil supply channel for supplying oil. One end of the oil supply protection component is connected to the oil supply channel, and the other end extends into the oil reservoir of the compressor. One end of the oil guide component is connected to the oil supply channel, and the other end is connected to the side of the oil supply protection component near the oil reservoir. The oil supply channel is provided with a first mounting position, and the oil supply protection component is provided with a first connecting part, which is connected to the first mounting position.

2. A gerotor pump according to claim 1, wherein Along the length of the oil guide, both sides of the oil guide are respectively interference-fitted to the oil supply channel and the oil supply protection component.

3. A spiral oil pump according to claim 2, characterized in that, The oil guide component has a first spiral part and a second spiral part. The diameter of the first spiral part is a first diameter D1, and the diameter of the second spiral part is a second diameter D2. The first diameter D1 is larger than the diameter of the oil supply channel, and the second diameter D2 is larger than the diameter of the oil supply protection component.

4. A gerotor pump according to claim 3, wherein Along the length of the oil guide, the oil guide has an extension that extends out of the oil supply channel and a first embedded part that is embedded in the oil supply channel. The oil supply protection component has a second embedded part that is embedded in the oil supply channel. The maximum length of the extension is a first length L1, the maximum length of the first embedded part is a second length L2, and the maximum length of the second embedded part is a third length L3; satisfying: L2=1 / 2L1, L3=1 / 3L2.

5. A gerotor pump according to claim 4, wherein Along the length direction of the oil guide, the maximum length of the first spiral part is the fourth length L4, which satisfies: L4=1 / 3L1.

6. A gerotor pump according to claim 1, wherein The oil supply protection component is further provided with a first inclined portion for stabilizing oil supply, and the first inclined portion is located on the side of the oil supply protection component away from the first connecting portion.

7. A gerotor pump according to claim 1, wherein The oil supply channel has a first channel and a second channel that are connected to each other. The diameter of the second channel is smaller than that of the first channel, and the first mounting position is located on the inner wall of the first channel.

8. A gerotor pump according to claim 7, wherein A second inclined section for guiding flow is also provided between the first channel and the second channel.

9. A gerotor pump according to claim 1, wherein The oil supply protection component is provided with at least two first connecting parts, and multiple first connecting parts are connected to the first mounting position.

10. A compressor characterized by, The invention includes a spiral oil pump, a housing, and an oil reservoir as described in any one of claims 1-9, wherein the crankshaft is rotatably connected to the housing, and the oil reservoir is connected to the housing and spaced apart from the spiral oil pump.

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