Engine oil supply system and engine lubricating system
By introducing a bypass valve design into the engine lubrication system to adjust the oil flow path to adapt to different operating conditions, the problem of high oil pump power consumption during low-temperature start-up is solved, flow resistance and power consumption are reduced, and the reliability of the system is improved.
Patent Information
- Application Number
- CN202520321032.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-26
AI Technical Summary
When starting an engine at low temperatures, the higher viscosity of the engine oil leads to higher power consumption of the oil pump, and existing technologies have not been able to effectively solve this problem.
Design an oil supply system including a main oil passage, an oil cooler, and a bypass valve. The bypass valve adjusts the flow path under different operating conditions to divert the oil flow, thereby reducing the flow resistance of the oil cooler and the power consumption of the oil pump.
By using a bypass valve for flow diversion, the flow resistance of the oil cooler is reduced, the power consumption of the oil pump is decreased, the reliability of the oil cooler is improved, and it can meet the needs of different operating conditions.
Smart Images
Figure CN223839208U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine technology, and in particular to an oil supply system and an engine lubrication system. Background Technology
[0002] Engine oil plays a vital role in ensuring the normal operation of an engine, providing lubrication, reducing friction, aiding in cooling, sealing against leaks, preventing rust and corrosion, and damping shocks. Normally, after being pumped out by the oil pump, the engine oil is cooled by the oil cooler to dissipate heat and lower its temperature. However, during cold starts, the viscosity of the engine oil is higher, which leads to greater flow resistance in the oil cooler and consequently, higher power consumption by the oil pump. Utility Model Content
[0003] This invention provides an oil supply system and an engine lubrication system to improve the problem of high oil pump power consumption caused by high viscosity of engine oil during low-temperature engine start-up.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] An oil supply system includes a main oil passage, an oil cooler, and a bypass valve. The main oil passage has an oil pump connection port, a first bypass interface, and a second bypass interface, with the second bypass interface located downstream of the first bypass interface. The oil pump connection port is used to connect to the oil outlet of the oil pump. The first bypass interface is connected to the oil inlet of the oil cooler, and the second bypass interface is connected to the oil outlet of the oil cooler.
[0006] The bypass valve is disposed in the main oil passage and located upstream of the second bypass interface; the bypass valve and the main oil passage together define a first flow channel with a cross-sectional area smaller than that of the main oil passage, the first flow channel connecting the oil pump connection port and the pipe section of the main oil passage located downstream of the bypass valve; the bypass valve also has a second flow channel connecting the oil pump connection port and the first bypass interface, the bypass valve opening when the pressure difference between the second flow channel and the pressure of the pipe section of the main oil passage located downstream of the bypass valve is greater than a preset value.
[0007] Optionally, the bypass valve includes a valve seat and a valve core assembly. The valve seat is a hollow cylindrical body, which includes a first section, a middle section, and a second section arranged along the axial direction of the cylindrical body. The second section is located downstream of the first section. The second section is open at one end opposite to the middle section, and the valve core assembly is disposed at the end of the second section opposite to the middle section.
[0008] The outer surface of the first segment abuts against the inner wall of the main oil passage, and there is a gap between the outer surface of the middle segment and the inner wall of the main oil passage. The outer surface of the second segment and the inner wall of the main oil passage together define a plurality of mutually spaced channels. The first flow channel includes the gap and the plurality of mutually spaced channels.
[0009] Optionally, the second segment includes a body and a plurality of protrusions disposed on the surface of the body. The plurality of protrusions are arranged at intervals along the circumference of the second segment, and each of the protrusions abuts against the inner wall of the main oil passage.
[0010] Optionally, the plurality of protrusions are evenly distributed along the circumference of the second segment.
[0011] Optionally, the sidewall of the intermediate section is provided with a plurality of through holes, which connect the oil pump connection port and the first bypass interface.
[0012] Optionally, any of the through holes is an oblong hole, and the length direction of the oblong hole is parallel to the axial direction of the bypass valve.
[0013] Optionally, the valve core assembly includes a connecting seat, a floating member, and an elastic member. The connecting seat is fixed to the open end of the second section. The connecting seat has a first through hole extending along the axial direction of the bypass valve, and the side wall of the connecting seat is provided with at least one second through hole communicating with the first through hole. The elastic member and the floating member are sequentially disposed in the first through hole along the direction from the second section to the first section, and one end of the elastic member is fixed relative to the connecting seat, while the other end of the elastic member abuts against the floating member.
[0014] When the pressure difference between the second flow channel and the main oil channel downstream of the bypass valve is greater than a preset value, the floating member can overcome the action of the elastic member under pressure and move in the opposite direction to the first segment, so that the second through hole can communicate with the middle segment through the first through hole.
[0015] Optionally, the oil supply system includes an oil filter; the main oil passage has a third bypass port located downstream of the second bypass port and a fourth bypass port located downstream of the third bypass port, and the section of the main oil passage between the third bypass port and the fourth bypass port is closed.
[0016] The third bypass interface is connected to the oil inlet of the oil filter, and the fourth bypass interface is connected to the oil outlet of the oil filter.
[0017] Optionally, the main oil passage is a one-piece molded structure.
[0018] This utility model also provides an engine lubrication system, which includes the above-mentioned oil supply system.
[0019] When using this scheme, under high-temperature or low-speed engine conditions, the pressure difference across the bypass valve is insufficient to open it. A portion of the oil entering through the oil pump connection enters the downstream of the bypass valve via the first flow channel, while the remaining oil enters the oil cooler inlet via the second flow channel. After being cooled by the oil cooler, the oil returns to the main oil passage via the oil cooler outlet. By splitting the oil entering the main oil passage from the oil pump connection into two paths—one leading to the oil cooler and the other flowing through the first flow channel—the flow rate through the oil cooler is reduced, thus lowering its flow resistance and consequently reducing the power consumption of the oil pump.
[0020] When the engine operates at low temperatures or high speeds, if the pressure difference between the second flow channel and the pressure in the main oil passage downstream of the bypass valve (i.e., the pressure difference before and after the bypass valve) exceeds a preset value, the bypass valve opens, thereby further relieving pressure. At this time, the oil entering the main oil passage from the oil pump connection port is split into three paths: one flowing into the oil cooler, one flowing through the first flow channel, and one flowing through the third bypass valve. This three-way oil flow further relieves pressure, reduces the flow resistance and load on the oil cooler, thereby reducing the power consumption of the oil pump and improving the reliability of the oil cooler. Attached Figure Description
[0021] Figure 1 A cross-sectional view of an oil supply system provided in an embodiment of this application;
[0022] Figure 2 for Figure 1 A partial schematic diagram;
[0023] Figure 3 for Figure 2 A schematic diagram of the bypass valve in the diagram;
[0024] Figure 4 An exploded view of the valve core assembly in a bypass valve of an oil supply system provided in an embodiment of this utility model;
[0025] Icons: 1-Main oil passage; 11-Oil pump connection port; 12-First bypass interface; 13-Second bypass interface; 14-Third bypass interface; 15-Fourth bypass interface; 2-Oil cooler; 3-Bypass valve; 31-Valve seat; 311-First section; 312-Intermediate section; 3121-Through hole; 313-Second section; 3131-Body; 3132-Protrusion; 32-Valve core assembly; 321-Connecting seat; 3211-Second through hole; 322-Floating component; 323-Elastic component; 324-Limit seat; 325-Snap ring; 4-Oil filter; 5-External thread plug; 100-First flow channel; 110-Gap; 120-Channel. Detailed Implementation
[0026] 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.
[0027] Figure 1 This is a cross-sectional view of an oil supply system provided in an embodiment of this application. Figure 2 for Figure 1 A partial schematic diagram. (For example...) Figure 1 and Figure 2 As shown, the oil supply system includes a main oil passage 1, an oil cooler 2, and a bypass valve 3. The main oil passage 1 has an oil pump connection port 11, a first bypass interface 12, and a second bypass interface 13, with the second bypass interface 13 located downstream of the first bypass interface 12. It should be understood that "upstream" and "downstream" in this embodiment refer to the direction of oil flow. Further, the oil pump connection port 11 is used to connect to the oil outlet of the oil pump, the first bypass interface 12 is connected to the oil inlet of the oil cooler 2, and the second bypass interface 13 is connected to the oil outlet of the oil cooler 2.
[0028] A bypass valve 3 is installed in the main oil passage 1 and located upstream of the second bypass port 13. The bypass valve 3 and the inner wall of the main oil passage 1 together define a first flow channel 100. The cross-sectional area of the first flow channel 100 is smaller than that of the main oil passage 1. The first flow channel 100 connects the oil pump connection port 11 with the section of the main oil passage 1 located downstream of the bypass valve 3. It should be understood that the cross-section of the first flow channel 100 refers to the section of the first flow channel 100 perpendicular to the axis of the main oil passage 1, and the cross-section of the main oil passage 1 refers to the section of the main oil passage 1 perpendicular to its axis. Please continue to refer to... Figure 1 and Figure 2The bypass valve 3 also has a second flow channel a that connects the oil pump connection port 11 and the first bypass interface 12. When the pressure difference between the second flow channel a and the pressure in the main oil passage 1 downstream of the bypass valve 3 is greater than a preset value, the bypass valve 3 opens.
[0029] When this solution is used in the engine lubrication system, under high-temperature or low-speed engine conditions, the pressure difference across the bypass valve 3 is insufficient to open it. A portion of the oil entering through the oil pump connection port 11 flows downstream of the bypass valve 3 via the first flow channel 100, while the remaining oil enters the oil inlet of the oil cooler 2 via the second flow channel a. After being cooled by the oil cooler 2, the oil returns to the main oil passage 1 via the oil cooler 2's outlet. By splitting the oil entering the main oil passage from the oil pump connection port 11 into two paths—one leading to the oil cooler 2 and the other flowing through the first flow channel 100—the flow rate of oil through the oil cooler 2 is reduced, thus lowering the flow resistance of the oil cooler 2 and consequently reducing the power consumption of the oil pump.
[0030] When the pressure difference between the second flow channel a and the pressure in the section of the main oil passage 1 downstream of the bypass valve 3 (i.e., the pressure difference before and after the bypass valve 3) is greater than a preset value under low temperature or high speed conditions of the engine, the bypass valve 3 opens, thereby achieving further pressure relief. At this time, the oil entering the main oil passage 1 from the oil pump connection port 11 is split into three paths: one to the oil cooler 2, one through the first flow channel 100, and one through the third bypass valve 3. The three-way oil flow further relieves pressure, further reducing the flow resistance and load on the oil cooler 2, which can reduce the power consumption of the oil pump and improve the reliability of the oil cooler 2.
[0031] Figure 3 for Figure 2 The schematic diagram of the bypass valve 3 in the diagram is shown below. Next, please refer to... Figure 2 and Figure 3 In one specific implementation, the bypass valve 3 includes a valve seat 31 and a valve core assembly 32. The valve seat 31 is a hollow cylindrical body, which includes a first segment 311, a middle segment 312, and a second segment 313 arranged along the axial direction of the cylindrical body. The second segment 313 is located downstream of the first segment 311. The end of the second segment 313 opposite to the middle segment 312 is open, and the valve core assembly 32 is disposed at the end of the second segment 313 opposite to the middle segment 312. The outer surface of the first segment 311 abuts against the inner wall of the main oil passage 1. There is a gap 110 between the outer surface of the middle segment 312 and the inner wall of the main oil passage 1. The outer surface of the second segment 313 and the inner wall of the main oil passage 1 together define a plurality of mutually spaced channels 120. The first flow channel 100 includes the aforementioned gap 110 and the aforementioned plurality of mutually spaced channels 120.
[0032] In practice, the end of the first segment 311 opposite to the second segment 313 can be an open structure and sealed by an external threaded plug 5 to facilitate the installation of the valve core assembly 32.
[0033] In one possible implementation, the second segment 313 includes a body 3131 and a plurality of protrusions 3132 disposed on the surface of the body 3131. These protrusions 3132 are spaced apart circumferentially along the second segment 313, and each protrusion 3132 abuts against the inner wall of the main oil passage 1, thereby allowing two adjacent protrusions 3132, the body 3131, and the inner wall of the main oil passage 1 to jointly define a channel 120. Furthermore, the protrusions 3132 also serve to support the valve seat 31 and reduce valve seat 31 wobbling. Exemplarily, the plurality of protrusions 3132 are evenly distributed circumferentially along the second segment 313 to ensure more balanced force on the valve seat 31 and enhance the reliability of the bypass valve 3. Of course, in other embodiments, the plurality of protrusions 3132 may also be non-uniformly distributed circumferentially along the second segment 313.
[0034] In one possible implementation, the sidewall of the intermediate section 312 is provided with multiple through holes 3121, which connect the oil pump connection port 11 and the first bypass interface 12. That is, the multiple through holes 3121 constitute the aforementioned second flow channel a. For example, any through hole 3121 is an oblong hole, and the length direction of the oblong hole is parallel to the axial direction of the bypass valve 3, thereby making the cross-sectional area of the second flow channel larger and the flow rate of the second flow channel larger.
[0035] Figure 4 This is an exploded view of the valve core assembly 32 in the bypass valve 3 of an oil supply system provided in this embodiment. Please refer to the diagram. Figure 2 and Figure 4 In one possible implementation, the valve core assembly 32 includes a connecting seat 321, a floating member 322, and an elastic member 323. The connecting seat 321 is fixed to the open end of the second segment 313. The connecting seat 321 has a first through hole extending along the axial direction of the bypass valve 3, and the side wall of the connecting seat 321 is provided with at least one second through hole 3211 communicating with the first through hole. The elastic member 323 and the floating member 322 are sequentially arranged in the first through hole along the direction from the second segment 313 to the first segment 311. In the through hole, one end of the elastic element 323 is fixed relative to the connecting seat 321, and the other end of the elastic element 323 abuts against the floating element 322; when the pressure difference between the pressure in the second flow channel and the pressure of the pipe section of the main oil channel 1 located downstream of the bypass valve 3 is greater than a preset value, the floating element 322 can overcome the action of the elastic element 323 under pressure and move in the opposite direction to the first section 311, so that the second through hole 3211 is connected to the middle section 312 through the first through hole and the bypass valve 3 is opened. For example, the elastic element 323 can be a spring.
[0036] The valve core assembly 32 may also include a limiting seat 324 and a retaining ring 325. The retaining ring 325 is fixed on the inner wall of the end of the connecting seat 321 opposite to the first segment 311. The limiting seat 324 is located on the side of the retaining ring 325 facing the first segment 311. The end of the elastic member 323 opposite to the first segment 311 abuts against the limiting seat 324, thereby fixing it relative to the connecting seat 321.
[0037] Please refer to the following. Figure 1 In one possible implementation, the oil supply system includes an oil filter 4; the main oil passage 1 has a third bypass port 14 downstream of the second bypass port 13 and a fourth bypass port 15 downstream of the third bypass port 14, and the section of the main oil passage 1 between the third bypass port 14 and the fourth bypass port 15 is closed; the third bypass port 14 is connected to the oil inlet of the oil filter 4, and the fourth bypass port 15 is connected to the oil outlet of the oil filter 4. The diversion function of the bypass valve 3 can also reduce the flow resistance of the oil filter 4, which is also beneficial to reducing the power consumption of the oil pump.
[0038] In practice, the pipe section of the main oil passage 1 located between the third bypass interface 14 and the fourth bypass interface 15 can be sealed by using a plug. The plug can be connected to the main oil passage 1 by means of interference fit or threaded connection.
[0039] In one possible implementation, the main oil passage 1 is a one-piece molded structure, which simplifies the design process and structure of the main oil passage 1, and makes the main oil passage 1 lighter. In addition, the oil cooler 2 and the oil filter 4 are fixedly connected to the main oil passage 1, which also makes the structure of the oil supply system more compact and the flow of oil smoother.
[0040] This embodiment provides an engine lubrication system including the aforementioned oil supply system. Under high-temperature or low-speed engine operating conditions, the pressure difference across the bypass valve 3 is insufficient to open it. A portion of the oil entering through the oil pump connection port 11 flows downstream of the bypass valve 3 via the first flow channel 100, while the remaining portion flows through the second flow channel a into the inlet of the oil cooler 2. After being cooled by the oil cooler 2, the oil returns to the main oil passage 1 via the outlet of the oil cooler 2. By splitting the oil entering the main oil passage from the oil pump connection port 11 into two paths—one leading to the oil cooler 2 and the other flowing through the first flow channel 100—the flow rate of oil passing through the oil cooler 2 is reduced, thereby reducing the flow resistance of the oil cooler 2 and consequently reducing the power consumption of the oil pump.
[0041] When the pressure difference between the second flow channel a and the pressure in the section of the main oil passage 1 downstream of the bypass valve 3 (i.e., the pressure difference before and after the bypass valve 3) is greater than a preset value under low temperature or high speed conditions of the engine, the bypass valve 3 opens, thereby achieving further pressure relief. At this time, the oil entering the main oil passage 1 from the oil pump connection port 11 is split into three paths: one to the oil cooler 2, one through the first flow channel 100, and one through the third bypass valve 3. The three-way oil flow further relieves pressure, further reducing the flow resistance and load on the oil cooler 2, which can reduce the power consumption of the oil pump and improve the reliability of the oil cooler 2.
[0042] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. An oil supply system, characterized in that, It includes a main oil passage, an oil cooler, and a bypass valve. The main oil passage has an oil pump connection port, a first bypass interface, and a second bypass interface, with the second bypass interface located downstream of the first bypass interface. The oil pump connection port is used to connect to the oil outlet of the oil pump. The first bypass interface is connected to the oil inlet of the oil cooler, and the second bypass interface is connected to the oil outlet of the oil cooler. The bypass valve is disposed in the main oil passage and located upstream of the second bypass interface; the bypass valve and the main oil passage together define a first flow channel with a cross-sectional area smaller than that of the main oil passage, the first flow channel connecting the oil pump connection port and the pipe section of the main oil passage located downstream of the bypass valve; the bypass valve also has a second flow channel connecting the oil pump connection port and the first bypass interface, the bypass valve opening when the pressure difference between the second flow channel and the pressure of the pipe section of the main oil passage located downstream of the bypass valve is greater than a preset value.
2. The oil supply system according to claim 1, characterized in that, The bypass valve includes a valve seat and a valve core assembly. The valve seat is a hollow cylindrical body. The cylindrical body includes a first section, a middle section, and a second section arranged along the axial direction of the cylindrical body. The second section is located downstream of the first section. The end of the second section opposite to the middle section is open. The valve core assembly is disposed at the end of the second section opposite to the middle section. The outer surface of the first segment abuts against the inner wall of the main oil passage, and there is a gap between the outer surface of the middle segment and the inner wall of the main oil passage. The outer surface of the second segment and the inner wall of the main oil passage together define a plurality of mutually spaced channels. The first flow channel includes the gap and the plurality of mutually spaced channels.
3. The oil supply system according to claim 2, characterized in that, The second segment includes a body and a plurality of protrusions disposed on the surface of the body. The plurality of protrusions are arranged at intervals along the circumference of the second segment, and each of the protrusions abuts against the inner wall of the main oil passage.
4. The oil supply system according to claim 3, characterized in that, The plurality of protrusions are evenly distributed along the circumference of the second segment.
5. The oil supply system according to claim 2, characterized in that, The side wall of the middle section is provided with multiple through holes, which connect the oil pump connection port and the first bypass interface.
6. The oil supply system according to claim 5, characterized in that, All of the through holes are oblong holes, and the length direction of the oblong hole is parallel to the axis direction of the bypass valve.
7. The oil supply system according to any one of claims 2-6, characterized in that, The valve core assembly includes a connecting seat, a floating member, and an elastic member. The connecting seat is fixed to the open end of the second section. The connecting seat has a first through hole extending along the axial direction of the bypass valve, and the side wall of the connecting seat is provided with at least one second through hole communicating with the first through hole. The elastic member and the floating member are sequentially disposed in the first through hole along the direction from the second section to the first section, and one end of the elastic member is fixed relative to the connecting seat, while the other end of the elastic member abuts against the floating member. When the pressure difference between the second flow channel and the main oil channel downstream of the bypass valve is greater than a preset value, the floating member can overcome the action of the elastic member under pressure and move in the opposite direction to the first segment, so that the second through hole can communicate with the middle segment through the first through hole.
8. The oil supply system according to any one of claims 1-6, characterized in that, Includes an oil filter; the main oil passage has a third bypass port located downstream of the second bypass port and a fourth bypass port located downstream of the third bypass port, and the pipe section of the main oil passage between the third bypass port and the fourth bypass port is closed. The third bypass interface is connected to the oil inlet of the oil filter, and the fourth bypass interface is connected to the oil outlet of the oil filter.
9. The oil supply system according to claim 8, characterized in that, The main oil passage is a one-piece molded structure.
10. An engine lubrication system, characterized in that, Includes the oil supply system as described in any one of claims 1-9.