Energy-saving engine oil control valve with oil internal circulation and engine system

Abstract

The present application belongs to the technical field of engine oil control valve, and particularly relates to an energy-saving engine oil control valve with internal oil circulation, which comprises a shell, a valve body and a piston, all of which are hollow structures; the shell is provided with a first working oil hole and a second working oil hole; the valve body is fixedly installed in the shell, and a ring-shaped one-way valve is installed in the valve body; the piston is slidingly installed in the valve body, and an oil inlet is in communication with a fourth oil inlet; the piston comprises a first state and a second state; when the piston is in the first state, the second working oil hole is in communication with a fourth communication oil port, a second annular oil groove, a ninth communication oil port, an eighth communication oil port and a fifth communication oil port; when the piston is in the second state, the first working oil hole is in communication with a sixth communication oil port, a fourth annular oil groove, a fourteenth communication oil port, a thirteenth communication oil port and a seventh communication oil port. The purpose is to solve the problems of high manufacturing cost and assembly difficulty, low durability and reliability of components and the risk of abnormal sound caused by the structural defects of the existing control valve.

Description

Technical Field

[0001] This invention belongs to the field of oil control valve technology, specifically relating to an energy-saving oil control valve and engine system for internal oil circulation. Background Technology

[0002] Variable valve timing (VVT) in automotive engines refers to adjusting the phase relationship between the camshaft and crankshaft to achieve optimal valve timing during engine operation, thereby significantly improving fuel economy, power, torque, and emissions characteristics.

[0003] Variable valve timing adjustment mainly uses the oil pump to output oil pressure to the oil control valve, which directly drives the VVT ​​to adjust the phase. The disadvantage of this method is that the oil pressure requirement is large and the oil leakage is large, which increases the workload of the oil pump and thus increases the overall fuel consumption. Therefore, under the background of the extreme thermal efficiency requirements of hybrid dedicated engines, an energy-saving oil control valve is needed.

[0004] Currently, some energy-saving oil control valves can utilize camshaft torque to achieve internal oil circulation, thereby reducing the workload of the oil pump. However, they generally employ two or more check valves, with the check valves positioned within the piston and moving synchronously with it. This results in a complex structure, high manufacturing costs, difficult assembly, and low durability and reliability of the components.

[0005] Chinese invention patent (publication number: CN110318836A) discloses a radial loop energy-saving oil control valve that can realize the internal circulation function of oil. However, it uses two one-way valves to realize the internal circulation function of oil, which has high manufacturing cost and assembly difficulty. Moreover, the one-way valves that realize the internal circulation function of oil are located inside the piston. While realizing the internal circulation function of oil, the one-way valves will reciprocate with the piston at a high frequency, resulting in low component durability and reliability and the risk of abnormal noise. Summary of the Invention

[0006] The purpose of this invention is to provide an energy-saving oil control valve for internal oil circulation, which solves the problems of high manufacturing cost and assembly difficulty, low component durability and reliability, and abnormal noise risk caused by the structural defects of existing control valves.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0008] An energy-saving oil control valve for internal oil circulation.

[0009] This includes a hollow housing, valve body, and piston;

[0010] The housing has an installation port and a first oil inlet at its two ends, and a first working oil hole and a second working oil hole are radially provided on the housing.

[0011] The valve body is fixedly installed inside the housing. An installation groove is provided inside the valve body. An annular one-way valve is installed in the installation groove. The side wall of the valve body is radially provided with a fifth, seventh, ninth, fourteenth, fourth, and sixth connecting oil port that penetrate the side wall of the valve body.

[0012] The piston has a third annular oil groove, a second annular oil groove, and a fourth annular oil groove on its outer wall. The piston also has a fourth oil inlet at the third annular oil groove that penetrates the piston side wall.

[0013] The first oil inlet is connected to the fourth oil inlet, the piston is slidably installed in the valve body, and the oil inlet is connected to the fourth oil inlet through the hollow inner cavity of the piston.

[0014] The piston includes a first state and a second state;

[0015] When the piston is in the first state, the third annular oil groove is connected to the sixth connecting oil port, and the second working oil hole is connected to the fourth connecting oil port, the second annular oil groove, the ninth connecting oil port, and the fifth connecting oil port in sequence.

[0016] When the piston is in the second state, the third annular oil groove is connected to the fourth connecting oil port, and the first working oil hole is connected to the sixth connecting oil port, the fourth annular oil groove, the fourteenth connecting oil port, and the seventh connecting oil port in sequence.

[0017] Further specifying, an eighth connecting port is formed between the fifth and ninth connecting ports on the outer wall of the valve body, and a thirteenth connecting port is formed between the seventh and fourteenth connecting ports on the outer wall of the valve body. This structural design, through the eighth and thirteenth connecting ports on the outer wall of the valve body, connects the fifth and ninth connecting ports, and the seventh and fourteenth connecting ports, respectively. It is simple in structure, easy to manufacture, and highly practical. In practice, other connection methods can also be used according to actual needs, such as forming corresponding connecting ports on the inner wall of the housing, as long as the connection between the fifth and ninth connecting ports, and between the seventh and fourteenth connecting ports, can be achieved.

[0018] Furthermore, the housing is radially provided with a first oil drain hole, the valve body is radially provided with a third connecting oil port, and the outer wall of the valve body is provided with a fifteenth connecting oil port. The first oil drain hole is connected to the third connecting oil port via the fifteenth connecting oil port. This structural design, through the third connecting oil port, disrupts the sealed space formed by the end of the piston and the end of the valve body, thereby achieving the degassing function and preventing the sealed space from affecting the movement of the piston, making it highly practical.

[0019] Further specifying, the housing is radially provided with a second oil drain hole, and the valve body is radially provided with a tenth connecting oil port and a twelfth connecting oil port. An eleventh connecting oil port is provided on the outer wall of the valve body between the tenth and twelfth connecting oil ports. The second oil drain hole communicates with the eleventh connecting oil port. When the piston is in the first state, the second annular oil groove communicates with the tenth connecting oil port. When the piston is in the second state, the fourth annular oil groove communicates with the twelfth connecting oil port. This structural design, through the connection between the twelfth connecting oil port and the fourth annular oil groove, allows for internal circulation of the oil in the VVT ​​advance adjustment oil chamber. A portion of the oil in the fourth annular oil groove flows out of the control valve through the twelfth connecting oil port, the eleventh connecting oil port, and the second oil drain hole, preventing the problem of excessive oil pressure in the VVT ​​advance adjustment oil chamber causing the positive camshaft torque to fail to quickly drive the VVT ​​rotor.

[0020] Similarly, through the connection between the tenth connecting oil port and the second annular oil groove, when the oil in the VVT ​​lag adjustment oil chamber is internally circulated, part of the oil in the second annular oil groove flows out of the control valve through the tenth connecting oil port, the eleventh connecting oil port, and the second unloading hole, thus avoiding the problem that the negative camshaft torque cannot quickly drive the VVT ​​rotor to rotate due to excessive oil pressure in the VVT ​​lag adjustment oil chamber.

[0021] Furthermore, the inner wall of the housing has a limiting groove at one end of the mounting port, and a limiting clamp is installed in the limiting groove. The housing also has a limiting stop at the first oil inlet. This structural design, through the cooperation of the limiting clamp and the limiting stop, completes the fixed installation between the valve body and the housing. It is simple in structure, easy to install, and highly practical.

[0022] Furthermore, a filter assembly is installed between the flange and the valve body. This structural design, with the filter assembly installed at the first oil inlet and pressed against the limiting flange of the housing by the valve body, filters the oil entering the control valve, preventing impurities in the oil from entering the oil control valve, thus demonstrating strong practicality.

[0023] Furthermore, both the fifth and seventh connecting oil ports are groove-shaped through holes. This structural design, using groove-shaped through holes to form the fifth and seventh connecting oil ports, maximizes the flow area of ​​the fifth and seventh connecting oil ports within the limited width of the mounting groove, thereby increasing the oil flow rate. The structure is simple and highly practical.

[0024] Further specified, the third annular oil groove is located between the second annular oil groove and the fourth annular oil groove.

[0025] Further specifying, both the valve body and the piston are hollow structures with one open end and one closed end. The inner wall of the closed end of the valve body is provided with a return spring mounting base, and the closed end of the piston is provided with a return spring mounting seat. A return spring is installed between the return spring mounting base and the return spring mounting seat. This structural design, through the return spring installed between the valve body and the piston, works in conjunction with an electromagnet to push the piston. When the electromagnet releases its push on the piston, the piston can return to its original position under the action of the return spring. The structure is simple and highly practical.

[0026] Further defined, the outer wall of the valve body is provided with a first connecting oil port circumferentially at one end near the first oil inlet, and the outer wall of the valve body is provided with a second connecting oil port radially communicating with the first connecting oil port. The outer wall of the piston is also provided with a first annular oil groove and a second oil inlet. The second oil inlet communicates the first annular oil groove with the hollow inner cavity of the piston. The hollow inner cavity of the piston that communicates with the second oil inlet and the fourth oil inlet is a third oil inlet.

[0027] The first oil inlet, the first connecting oil inlet, the second connecting oil inlet, the first annular oil groove, the second oil inlet, the third oil inlet, the fourth oil inlet, and the third annular oil groove are all in a normally connected state when the piston is in any state.

[0028] Furthermore, the first oil inlet is connected to the fourth oil inlet and is equipped with an inlet check valve. This structural design, by installing an inlet check valve in the oil inlet circuit, can effectively improve the response speed of the VVT ​​during engine start-up after prolonged engine idling and avoid abnormal noise from the VVT ​​during start-up due to insufficient oil inside the VVT ​​after prolonged engine idling. At the same time, the inlet check valve in the oil inlet circuit can also effectively prevent the camshaft torque from causing high oil pressure in the VVT ​​oil chamber, thus preventing backflow of oil in the oil inlet circuit, thereby improving the variable valve timing adjustment speed.

[0029] Further specifying, the piston has an axially formed plug mounting hole at its open end, and a plug is press-fitted into the plug mounting hole. A one-way valve disc mounting seat is provided between the fourth oil inlet and the second oil inlet on the piston.

[0030] The oil inlet check valve includes a check valve disc and a check valve spring. The check valve disc is mounted on a check valve disc mounting seat, and the check valve spring is installed between the plug and the check valve disc. This structural design, by using the oil inlet check valve composed of the check valve disc and the check valve spring, and cooperating with a plug that is interference-fitted into the plug mounting hole, completes the installation of the oil inlet check valve. The structure is simple, easy to install, and highly practical.

[0031] The present invention also discloses an engine system including the above-mentioned energy-saving oil control valve for internal oil circulation.

[0032] The invention employing the above technical solution has the following advantages:

[0033] 1. By using the annular check valve installed in the valve body, in conjunction with the ninth, eighth, fifth / fourteenth, thirteenth and seventh connecting oil ports installed on the valve body in sequence, the internal oil circulation function is realized, reducing the oil consumption during adjustment.

[0034] 2. By setting an annular one-way valve plate in the valve body, compared with the technical solution of placing the one-way valve inside the piston, the annular one-way valve can realize the function of internal oil circulation without reciprocating with the piston at a high frequency, thus improving the reliability of the components and reducing the risk of abnormal noise.

[0035] 3. The internal oil circulation function is achieved by replacing the existing two check valves with a single ring-shaped check valve, reducing manufacturing costs and assembly difficulty;

[0036] 4. By installing a one-way valve in the oil inlet circuit, the VVT ​​oil chamber is equipped with an oil storage function, which effectively improves the response speed of the VVT ​​during the start-up process after the engine has been idle for a long time, and avoids the problem of abnormal noise from the VVT ​​during start-up caused by insufficient oil inside the VVT ​​after the engine has been idle for a long time.

[0037] 5. The oil inlet check valve installed in the oil inlet circuit can also effectively prevent the camshaft torque from causing high oil pressure in the VVT ​​oil chamber, which would lead to backflow in the oil inlet circuit, thereby improving the variable valve timing adjustment speed.

[0038] 6. By connecting the twelfth connecting oil port to the fourth annular oil groove, when the oil in the VVT ​​advance adjustment oil chamber is internally circulated, part of the oil in the fourth annular oil groove flows out of the control valve through the twelfth connecting oil port, the eleventh connecting oil port, and the second oil discharge hole, thus avoiding the problem that the positive camshaft torque cannot quickly drive the VVT ​​rotor to rotate due to excessive oil pressure in the VVT ​​advance adjustment oil chamber.

[0039] Similarly, through the connection between the tenth connecting oil port and the second annular oil groove, when the oil in the VVT ​​lag adjustment oil chamber is internally circulated, part of the oil in the second annular oil groove flows out of the control valve through the tenth connecting oil port, the eleventh connecting oil port, and the second oil discharge hole, thus avoiding the problem that the negative camshaft torque cannot quickly drive the VVT ​​rotor to rotate due to excessive oil pressure in the VVT ​​lag adjustment oil chamber.

[0040] 7. The fifth and seventh connecting oil ports are formed by groove-shaped through holes. This allows for maximizing the flow area of ​​the fifth and seventh connecting oil ports even when the width of the mounting groove is limited, thereby increasing the oil flow. The structure is simple and highly practical. Attached Figure Description

[0041] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0042] Figure 1 This is an exploded structural diagram of an embodiment of an energy-saving oil control valve and engine system for internal oil circulation according to the present invention.

[0043] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of an energy-saving oil control valve and engine system for internal oil circulation according to the present invention.

[0044] Figure 3 This is a cross-sectional view of the housing portion in an embodiment of an energy-saving oil control valve and engine system for internal oil circulation according to the present invention.

[0045] Figure 4 This is a schematic diagram of the structure of the valve body in an embodiment of an energy-saving oil control valve for internal oil circulation according to the present invention. Figure 1 ;

[0046] Figure 5 This is a schematic diagram of the structure of the valve body in an embodiment of an energy-saving oil control valve for internal oil circulation according to the present invention. Figure 2 ;

[0047] Figure 6 This is a cross-sectional view of the valve body in an embodiment of an energy-saving oil control valve for internal oil circulation and an engine system according to the present invention.

[0048] Figure 7 This is a cross-sectional view of the piston portion in an embodiment of an energy-saving oil control valve for internal oil circulation and an engine system according to the present invention.

[0049] Figure 8 This is a schematic diagram of the structure of the filter assembly in an embodiment of an energy-saving oil control valve and engine system for internal oil circulation according to the present invention.

[0050] Figure 9 This is a schematic diagram of the assembly structure of an energy-saving oil control valve for internal oil circulation and an engine system embodiment of the present invention, mounted on the VVT ​​and camshaft.

[0051] Figure 10 This is a schematic diagram of an embodiment of an energy-saving oil control valve and engine system for internal oil circulation according to the present invention.

[0052] Figure 11 Working mode 1 Figure 10 Schematic diagram of the cross-sectional structure in the AA direction;

[0053] Figure 12 Working mode 1 Figure 10Schematic diagram of the cross-sectional structure in the middle BB direction;

[0054] Figure 13 Working mode 1 Figure 10 Schematic diagram of the cross-sectional structure in the CC direction;

[0055] Figure 14 Working Mode 2 Figure 10 Schematic diagram of the cross-sectional structure in the AA direction;

[0056] Figure 15 Working Mode 2 Figure 10 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0057] Figure 16 Working Mode 2 Figure 10 Schematic diagram of the cross-sectional structure in the CC direction;

[0058] The symbols for the main components are explained below:

[0059] Housing 1, First oil inlet 11, First working oil hole 12, Second working oil hole 13, First oil drain hole 14, Second oil drain hole 15, Limiting groove 16, Limiting stop 17.

[0060] Valve body 2, mounting groove 21, second connecting oil port 22, first connecting oil port 23, third connecting oil port 24

[0061] Return spring mounting base 25, fourth connecting oil port 26, fifth connecting oil port 27, sixth connecting oil port 28

[0062] Seventh connecting oil port 29, eighth connecting oil port 210, ninth connecting oil port 211, tenth connecting oil port 212

[0063] Eleventh connecting oil port 213, twelfth connecting oil port 214, thirteenth connecting oil port 215

[0064] Fourteenth connecting oil port 216, fifteenth connecting oil port 217

[0065] Piston 3, return spring mounting seat 31, first annular oil groove 32, second oil inlet 33, second annular oil groove 34

[0066] Third annular oil groove 35, fourth oil inlet 36, fourth annular oil groove 37, plug mounting hole 38

[0067] One-way valve disc mounting base 39, third oil inlet 310

[0068] Filter assembly 4, filter holder 41, filter 42

[0069] 5. Annular check valve, 6. Return spring, 7. Check valve disc, 8. Disc check valve spring, 9. Plug, 10. Limit clamp, 10. VVT stator, 200. VVT rotor, 300. Advance adjustment oil chamber, 400. Lag adjustment oil chamber, 500. Electromagnet, 700. Negative camshaft torque, 800. Positive camshaft torque, 900. Detailed Implementation

[0070] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In addition, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0071] like Figures 1-2 As shown, this invention provides an energy-saving oil control valve for internal oil circulation.

[0072] It includes a hollow shell 1, a valve body 2, and a piston 3.

[0073] like Figure 3 As shown, the housing 1 has an installation port and a first oil inlet 11 formed at both ends, and the housing 1 has a first working oil hole 12, a second working oil hole 13, a first oil drain hole 14 and a second oil drain hole 15 radially opened on the housing 1;

[0074] like Figure 2 , 4 As shown in Figure 6, a third connecting oil port 24 is radially provided on the valve body 2, and a fifteenth connecting oil port 217 is provided on the outer wall of the valve body 2. The first drain hole 14 is connected to the third connecting oil port 24 through the fifteenth connecting oil port 217.

[0075] The valve body 2 is also radially provided with a tenth connecting oil port 212 and a twelfth connecting oil port 214, and the outer wall of the valve body 2 is provided with an eleventh connecting oil port 213 between the tenth connecting oil port 212 and the twelfth connecting oil port 214.

[0076] The second drain hole 15 is connected to the eleventh connecting oil port 213;

[0077] like Figure 13 As shown, when piston 3 is in the first state, the second annular oil groove 34 is connected to the tenth connecting oil port 212;

[0078] like Figure 16 As shown, when piston 3 is in the second state, the fourth annular oil groove 37 is connected to the twelfth connecting oil port 214.

[0079] The first oil inlet 11 is connected to the fourth oil inlet 36 and is equipped with an oil inlet check valve. The piston 3 has an axially formed plug mounting hole 38 at its open end. A plug 9 is press-fitted into the plug mounting hole 38. A check valve disc mounting seat 39 is formed between the piston 3 and the fourth oil inlet 36 and the second oil inlet 33.

[0080] The oil inlet check valve includes a check valve disc 7 and a disc check valve spring 8.

[0081] The one-way valve disc 7 is mounted on the one-way valve disc mounting base 39, and the disc one-way valve spring 8 is mounted between the plug 9 and the one-way valve disc 7.

[0082] A filter assembly 4 is installed between the flange 17 and the valve body 2. The filter assembly 4 includes a filter seat 41 and a filter 42.

[0083] A limiting groove 16 is formed on the inner wall of the housing 1 at one end of the mounting opening, and a limiting clamp 10 is installed in the limiting groove 16.

[0084] The housing 1 is provided with a limiting stop 17 at the first oil inlet 11.

[0085] Valve body 2 is fixedly installed inside housing 1 by limiting clamp 10 and limiting stop 17;

[0086] like Figures 2-6 As shown, a mounting groove 21 is provided inside the valve body 2, and an annular check valve 5 is installed in the mounting groove 21.

[0087] The valve body 2 has a fifth connecting oil port 27 and a seventh connecting oil port 29 that penetrate the side wall of the valve body 2 at the mounting groove 21.

[0088] Both the fifth connecting oil port 27 and the seventh connecting oil port 29 are slot-shaped through holes;

[0089] The valve body 2 also has a ninth connecting oil port 211 and a fourteenth connecting oil port 216 that penetrate the side wall of the valve body 2 radially.

[0090] An eighth connecting port 210 is provided on the outer wall of the valve body 2 between the fifth connecting port 27 and the ninth connecting port 211.

[0091] A thirteenth connecting port 215 is provided on the outer wall of the valve body 2 between the seventh connecting port 29 and the fourteenth connecting port 216.

[0092] The valve body 2 is also radially provided with a fourth connecting oil port 26 and a sixth connecting oil port 28.

[0093] The first working oil hole 12 is connected to the sixth connecting oil port 28, and the second working oil hole 13 is connected to the fourth connecting oil port 26.

[0094] like Figure 2 and7 As shown, the outer wall of the piston 3 is provided with a third annular oil groove 35, a second annular oil groove 34 and a fourth annular oil groove 37. The piston 3 is provided with a fourth oil inlet 36 that penetrates the side wall of the piston 3 at the third annular oil groove 35.

[0095] The first oil inlet 11 is connected to the fourth oil inlet 36.

[0096] The third annular oil groove 35 is located between the second annular oil groove 34 and the fourth annular oil groove 37.

[0097] Piston 3 is slidably installed inside valve body 2. Both valve body 2 and piston 3 are hollow structures with one end open and the other end closed.

[0098] The inner wall of the closed end of the valve body 2 is provided with a return spring mounting base 25.

[0099] The closed end of piston 3 is provided with a return spring mounting seat 31.

[0100] A return spring 6 is installed between the return spring mounting base 25 and the return spring mounting seat 31;

[0101] Oil inlet 11 is connected to the fourth oil inlet 36 via the hollow inner cavity of piston 3.

[0102] Piston 3 includes a first state and a second state;

[0103] like Figures 11-13 As shown, when piston 3 is in the first state, the third annular oil groove 35 is connected to the sixth connecting oil port 28, and the second working oil hole 13 is connected to the fourth connecting oil port 26, the second annular oil groove 34, the ninth connecting oil port 211, the eighth connecting oil port 210, and the fifth connecting oil port 27 in sequence.

[0104] like Figures 14-16 As shown, when piston 3 is in the second state, the third annular oil groove 35 is connected to the fourth connecting oil port 26, and the first working oil hole 12 is connected to the sixth connecting oil port 28, the fourth annular oil groove 37, the fourteenth connecting oil port 216, the thirteenth connecting oil port 215, and the seventh connecting oil port 29 in sequence.

[0105] A first connecting oil port 23 is circumferentially opened on the outer wall of the valve body 2 near the first oil inlet 11.

[0106] The outer wall of the valve body 2 is radially provided with a second connecting port 22 that communicates with the first connecting port 23.

[0107] The outer wall of the piston 3 is also provided with a first annular oil groove 32 and a second oil inlet 33. The second oil inlet 33 connects the first annular oil groove 32 with the hollow inner cavity of the piston 3.

[0108] The hollow inner cavity of piston 3, which connects the second oil inlet 33 and the fourth oil inlet 36, is the third oil inlet 310.

[0109] The first oil inlet 11, the first connecting oil inlet 23, the second connecting oil inlet 22, the first annular oil groove 32, the second oil inlet 33, the third oil inlet 310, the fourth oil inlet 36, and the third annular oil groove 35 are all in a normally connected state when the piston 3 is in any state.

[0110] The first oil inlet 11 is connected to the fourth oil inlet 36 and is equipped with an oil inlet check valve. The piston 3 has an axially formed plug mounting hole 38 at its open end. A plug 9 is press-fitted into the plug mounting hole 38. A check valve disc mounting seat 39 is formed between the piston 3 and the fourth oil inlet 36 and the second oil inlet 33.

[0111] The oil inlet check valve includes a check valve disc 7 and a disc check valve spring 8.

[0112] The one-way valve disc 7 is mounted on the one-way valve disc mounting base 39, and the disc one-way valve spring 8 is mounted between the plug 9 and the one-way valve disc 7.

[0113] An engine system comprising the aforementioned energy-saving oil control valve for internal oil circulation.

[0114] In this embodiment, the engine oil control valve has three operating modes: variable valve timing advance adjustment, variable valve timing lag adjustment, and variable valve timing hold adjustment. In the variable valve timing advance adjustment and variable valve timing lag adjustment modes, the camshaft torque can be used to achieve the internal oil circulation function. It should also be understood that the oil consumption in the variable valve timing hold adjustment mode is extremely low. In this mode, only the amount of oil leaked from the gaps between the components in the variable valve timing adjustment system needs to be replenished. Therefore, the internal oil circulation function is not required. This invention will not elaborate on this operating mode. The variable valve timing advance adjustment and variable valve timing lag adjustment modes will be described in detail with reference to the accompanying drawings.

[0115] like Figure 9 As shown, the oil control valve is mounted on the VVT ​​rotor 200 and simultaneously fixed to the camshaft 900 via a threaded connection. The electromagnet 500 is mounted on the front cover (not shown in the figure). Oil enters the camshaft 900 from the cylinder head oil passage (not shown in the figure), and then enters the VVT ​​advance oil chamber (the oil passage is indicated by the solid arrow in the figure). Simultaneously, oil in the VVT ​​lag oil chamber leaks into the oil control valve for internal oil circulation and drainage (the oil passage is shown in the figure). Figure 9 (As indicated by the dashed arrow).

[0116] Operating mode 1, variable valve timing advance adjustment:

[0117] like Figure 11 , Figure 12 , Figure 13 As shown, the ECU executes the variable valve timing advance adjustment command, transmitting the corresponding duty cycle signal to the electromagnet 500. The electromagnet 500 generates electromagnetic force to push the oil control valve piston 3 to overcome the spring force of the return spring 6 to the variable valve timing advance adjustment stroke. At this time, the first working oil hole 12, the sixth connecting oil port 28, the third annular oil groove 35, and the fourth oil inlet 36 are in a normally connected state; the second working oil hole 13, the fourth connecting oil port 26, the second annular oil groove 34, the ninth connecting oil port 211, the eighth connecting oil port 210, and the fifth connecting oil port 27 are in a normally connected state; the second annular oil groove 34, the tenth connecting oil port 212, the eleventh connecting oil port 213, and the second drain hole 15 are in a normally connected state.

[0118] Due to the characteristics of the annular one-way valve 5, the engine oil cannot enter the fifth connecting port 27 from the third annular oil groove 35, thus preventing the engine oil from entering the VVT ​​lag adjustment chamber 400 from the oil inlet when the variable valve timing phase advance adjustment is performed. Furthermore, the engine oil can enter the third annular oil groove 35 from the fifth connecting port 27 under the action of pressure difference.

[0119] Figure 11 , Figure 12 , Figure 13 The solid arrow in the middle indicates the oil inlet path. The engine oil enters the first connecting oil port 23 through the filter screen assembly 4 from the first oil inlet 11, and then flows through the second connecting oil port 22, the first annular oil groove 32, the second oil inlet 33, and the third oil inlet 310 in sequence. Under the pressure of the incoming engine oil, the one-way valve disc 7 overcomes the spring force of the disc one-way valve spring 8 and opens. Then it flows through the fourth oil inlet 36, the third annular oil groove 35, the sixth connecting oil port 28, and the first working oil hole 12 into the VVT ​​advance adjustment oil chamber 300 to drive the VVT ​​rotor 200 to realize the advance adjustment of the variable valve timing phase.

[0120] When the system is at a forward camshaft torque of 800, the torque applied to the VVT ​​rotor 200 causes the VVT ​​advance adjustment oil chamber 300 to generate high oil pressure. When the high oil pressure exceeds the inlet oil pressure, the one-way valve disc 7 closes, effectively preventing backflow in the inlet oil circuit, thereby improving the VVT ​​variable valve timing adjustment speed. Furthermore, while the engine oil pushes the VVT ​​rotor 200 to perform variable valve timing advance adjustment, the VVT ​​lag adjustment oil chamber 400 is in a draining state. Figure 11 , Figure 12The dashed arrow indicates the oil drain path. The oil in the VVT ​​lag regulating oil chamber flows sequentially through the second working oil hole 13, the fourth connecting oil port 26, the second annular oil groove 34, the ninth connecting oil port 211, the eighth connecting oil port 210, and the fifth connecting oil port 27 to the inlet of the annular check valve 5. At this time, under the action of the negative camshaft torque 700, the VVT ​​lag regulating oil chamber 400 generates high oil pressure, the annular check valve 5 is opened, and the oil enters the third annular oil groove 35 and merges with the oil inlet path to realize the internal circulation function of the oil.

[0121] In the VVT ​​lag adjustment chamber 400, some of the oil, besides circulating through the internal oil circulation circuit into the VVT ​​advance adjustment chamber 300 for reuse, is drained into the engine oil pan through the second drain hole 15 (not shown in the figure). It's important to understand that a separate drain circuit is necessary. This is because the camshaft torque changes periodically. When the system is in the forward camshaft torque state (800), the VVT ​​lag adjustment chamber 400 cannot generate high oil pressure to open the annular check valve 5 for internal oil circulation. At this time, the oil in the VVT ​​lag adjustment chamber 400 must drain through the drain circuit so that the oil pressure in the VVT ​​advance adjustment chamber 300 can drive the VVT ​​rotor 200 to perform variable valve timing advance adjustment. Figure 13 As shown, the engine oil in the VVT ​​hysteresis regulating oil chamber 400 flows to the second annular oil groove 34, and then part of the engine oil is diverted to the tenth connecting oil port 212, and then flows to the eleventh connecting oil port 213, the twelfth connecting oil port 214, and the second drain hole 15 to drain into the engine oil pan.

[0122] Operating mode 2, variable valve timing phase lag adjustment:

[0123] like Figure 14 , Figure 15 , Figure 16 As shown, the ECU executes the variable valve timing phase lag adjustment command, transmitting the corresponding duty cycle signal to the electromagnet 500. The electromagnet generates electromagnetic force to push the oil control valve piston 3 to overcome the spring force of the return spring 6 to the variable valve timing phase lag adjustment stroke. At this time, the second working oil hole 13, the fourth connecting oil port 26, the third annular oil groove 35, and the fourth oil inlet 36 are in a normally connected state; the first working oil hole 12, the sixth connecting oil port 28, the fourth annular oil groove 37, the fourteenth connecting oil port 216, the thirteenth connecting oil port 215, and the seventh connecting oil port 29 are in a normally connected state; the fourth annular oil groove 37, the twelfth connecting oil port 214, the eleventh connecting oil port 213, and the second drain hole 15 are in a normally connected state.

[0124] Due to the characteristics of the annular one-way valve 5, the engine oil cannot enter the seventh connecting port 29 from the third annular oil groove 35, thus preventing the engine oil from entering the VVT ​​advance adjustment oil chamber 300 from the oil inlet when the variable valve timing phase lag adjustment is performed. Furthermore, the engine oil can enter the third annular oil groove 35 from the seventh connecting port 29 under the action of pressure difference.

[0125] Figure 14 , Figure 15 , Figure 16 The solid arrow in the middle indicates the oil inlet path. The engine oil enters the first connecting oil port 23 through the filter screen assembly 4 from the first oil inlet 11, and then flows through the second connecting oil port 22, the first annular oil groove 32, the second oil inlet 33, and the third oil inlet 310 in sequence. Under the action of the engine oil pressure, the one-way valve disc 7 overcomes the spring force of the disc one-way valve spring 8 and opens. Then it flows through the fourth oil inlet 36, the third annular oil groove 35, the fourth connecting oil port 26, and the second working oil hole 13 into the VVT ​​lag adjustment oil chamber 400 to drive the VVT ​​rotor 200 to realize the variable valve timing phase lag adjustment.

[0126] When the system is under negative camshaft torque of 700, the torque is applied to the VVT ​​rotor 200, causing the VVT ​​hysteresis regulating oil chamber 400 to generate high oil pressure. When the high oil pressure is greater than the oil pressure in the inlet oil circuit, the one-way valve disc 7 closes, effectively preventing the backflow phenomenon in the inlet oil circuit, thereby improving the VVT ​​variable valve timing adjustment speed.

[0127] While the engine oil pushes the VVT ​​rotor 200 to adjust the variable valve timing phase lag, the VVT ​​advance adjustment oil chamber 300 is in an oil-draining state. Figure 14 and Figure 15 The dashed arrow indicates the oil drain path. The oil in the VVT ​​advance adjustment oil chamber flows sequentially through the first working oil hole 12, the sixth connecting oil port 28, the fourth annular oil groove 37, the fourteenth connecting oil port 216, the thirteenth connecting oil port 215, and the seventh connecting oil port 29 to the inlet of the annular check valve 5. At this time, under the action of the positive camshaft torque 800, the VVT ​​advance adjustment oil chamber 300 generates high oil pressure, the annular check valve 5 is opened, and the oil enters the third annular oil groove 35 and merges with the oil inlet, realizing the internal circulation function of the oil.

[0128] It should be further explained that, in addition to circulating some of the oil in the VVT ​​advance adjustment chamber 300 into the VVT ​​lag adjustment chamber 400 through the internal oil circulation circuit for reuse, another portion of the oil is drained into the engine oil pan through the second drain hole 15 (not shown in the figure). It is important to understand that a separate drain circuit is necessary because the camshaft torque changes periodically. When the system is under negative camshaft torque (700), the VVT ​​advance adjustment chamber 300 cannot generate high oil pressure to open the annular check valve 5 to achieve the internal oil circulation function. At this time, the oil in the VVT ​​advance adjustment chamber 300 must be drained through the drain circuit so that the oil pressure in the VVT ​​lag adjustment chamber 400 can drive the VVT ​​rotor 200 to perform variable valve timing phase lag adjustment. Figure 16 As shown, after the VVT ​​advance adjustment oil flows to the fourth annular oil groove 37, part of the oil is diverted to the twelfth connecting oil port 214, and then flows to the eleventh connecting oil port 213 and the second drain hole 15 to drain into the engine oil pan.

[0129] Further integration Figure 11 This invention describes the oil storage function inside the VVT ​​oil chamber. Taking the exhaust VVT as an example, after the engine stops, the VVT ​​is in the following state: Figure 11 The variable valve timing phase shown is at its most advanced position. At this point, due to the disc-type one-way valve structure inside the piston, the oil passage section consisting of the VVT ​​advance adjustment oil chamber 300, the first working oil hole 12, the sixth connecting oil port 28, the third annular oil groove 35, and the fourth oil inlet 36 can form a closed oil storage chamber. The engine oil will not be able to flow back to the cylinder head and cylinder block oil passage through the oil control valve inlet passage. This effectively improves the response speed of VVT variable valve timing phase adjustment during engine start-up after long-term engine idling and avoids the problem of abnormal VVT noise caused by insufficient oil inside VVT ​​after long-term engine idling.

[0130] like Figure 13 As shown, the piston 3 reciprocates within the valve body 2, achieving the degassing function through the third connecting oil port 24, the fifteenth connecting oil port 217, and the first drain hole 14. This prevents the front end of the piston 3 from forming a closed cavity with the inner cavity of the valve body 2, thus hindering the reciprocating motion of the piston 3. At the same time, the engine oil that leaks into the cavity formed by the front end of the piston 3 and the valve body 2 through the gap of the moving pair can also be drained through this oil passage.

[0131] The assembly sequence of the control valve is as follows: the filter assembly 4 is installed into the limiting stop 17 in the housing 1. The filter assembly 4 and the limiting stop 17 are provided with a foolproof structure (not shown in the figure) to ensure the uniqueness of the direction in which the filter assembly 4 is installed into the housing 1. The annular one-way valve 5 is then installed into the annular one-way valve mounting groove 21. The valve body 2 is then installed into the housing 1. The valve body 2 and the end face of the filter assembly 4 are provided with a foolproof structure (not shown in the figure) to ensure the uniqueness of the direction in which the valve body 2 is installed into the housing 1. The return spring 6 is then installed into the return spring mounting base 25. The one-way valve disc 7 is then installed into the one-way valve disc mounting base 39. The one-way valve spring 8 is then installed into the plug 9. The plug 9 is then press-fitted into the plug mounting hole 38. The piston 3 is then installed into the valve body 2. Finally, the limiting clamp 10 is installed. The oil control valve assembly process is smooth and simple.

[0132] The above provides a detailed description of an energy-saving oil control valve and engine system with internal oil circulation provided by the present invention. The specific embodiments described are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An energy-saving oil control valve for internal oil circulation, characterized in that: It includes a hollow shell (1), a valve body (2), and a piston (3); The housing (1) has an installation port and a first oil inlet (11) at both ends, and a first working oil hole (12) and a second working oil hole (13) are radially provided on the housing (1). The valve body (2) is fixedly installed inside the housing (1). The valve body (2) has an installation groove (21) inside. An annular check valve (5) is installed in the installation groove (21). The valve body (2) has a fifth connecting oil port (27), a seventh connecting oil port (29), a ninth connecting oil port (211), a fourteenth connecting oil port (216), a fourth connecting oil port (26), and a sixth connecting oil port (28) that penetrate the side wall of the valve body (2). The annular check valve (5) is used to prevent engine oil from entering the fifth connecting oil port (27) from the third annular oil groove (35). The piston (3) has a third annular oil groove (35), a second annular oil groove (34) and a fourth annular oil groove (37) on its outer wall. The piston (3) has a fourth oil inlet (36) that penetrates the side wall of the piston (3) at the third annular oil groove (35). The first oil inlet (11) is connected to the fourth oil inlet (36), the piston (3) is slidably installed in the valve body (2), and the oil inlet (11) is connected to the fourth oil inlet (36) through the hollow inner cavity of the piston (3); The piston (3) includes a first state and a second state; When the piston (3) is in the first state, the third annular oil groove (35) is connected to the sixth connecting oil port (28), and the second working oil hole (13) is connected to the fourth connecting oil port (26), the second annular oil groove (34), the ninth connecting oil port (211), and the fifth connecting oil port (27) in sequence, so that the oil in the VVT ​​hysteresis regulating oil chamber can flow through the second working oil hole (13), the fourth connecting oil port (26), the second annular oil groove (34), the ninth connecting oil port (211), and the fifth connecting oil port (27) to the inlet of the annular check valve (5). At this time, under the action of the negative camshaft torque (700), the VVT ​​hysteresis regulating oil chamber (400) generates high oil pressure, the annular check valve (5) is opened, and the oil enters the third annular oil groove (35) and the oil inlet circuit to merge, realizing the internal circulation function of the oil. When the piston (3) is in the second state, the third annular oil groove (35) is connected to the fourth connecting oil port (26), and the first working oil hole (12) is connected to the sixth connecting oil port (28), the fourth annular oil groove (37), the fourteenth connecting oil port (216), and the seventh connecting oil port (29) in sequence, so that the oil in the VVT ​​advance adjustment oil chamber can flow through the first working oil hole (12), the sixth connecting oil port (28), the fourth annular oil groove (37), the fourteenth connecting oil port (216), and the seventh connecting oil port (29) to the inlet of the annular check valve (5). At this time, under the action of the positive camshaft torque (800), the VVT ​​advance adjustment oil chamber (300) generates high oil pressure, the annular check valve (5) is opened, and the oil enters the third annular oil groove (35) and the oil inlet circuit to merge, realizing the internal circulation function of the oil.

2. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: An eighth connecting port (210) is provided on the outer wall of the valve body (2) between the fifth connecting port (27) and the ninth connecting port (211). The eighth connecting port (210) is used to connect the fifth connecting port (27) and the ninth connecting port (211) on the outer wall of the valve body (2). A thirteenth connecting port (215) is provided on the outer wall of the valve body (2) between the seventh connecting port (29) and the fourteenth connecting port (216). The thirteenth connecting port (215) is used to connect the seventh connecting port (29) and the fourteenth connecting port (216) on the outer wall of the valve body (2).

3. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: The housing (1) is also radially provided with a first oil drain hole (14), the valve body (2) is also radially provided with a third connecting oil port (24), and the outer wall of the valve body (2) is provided with a fifteenth connecting oil port (217). The first oil drain hole (14) is connected to the third connecting oil port (24) through the fifteenth connecting oil port (217). The third connecting oil port (24) destroys the sealed space formed by the end of the piston (3) and the end of the valve body (2), thereby realizing the degassing function.

4. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: The housing (1) is further provided with a second oil drain hole (15) in the radial direction, and the valve body (2) is further provided with a tenth connecting oil port (212) and a twelfth connecting oil port (214) in the radial direction. The outer wall of the valve body (2) is provided with an eleventh connecting oil port (213) between the tenth connecting oil port (212) and the twelfth connecting oil port (214). The second oil drain hole (15) is connected to the eleventh connecting oil port (213). When the piston (3) is in the first state, the second annular oil groove (34) is connected to the tenth connecting oil port (212), so that the oil in the VVT ​​hysteresis regulating oil chamber (400) flows to the second annular oil groove (34), and then part of the oil is diverted to the tenth connecting oil port (212), and then flows to the eleventh connecting oil port (213), the twelfth connecting oil port (214), and the second drain hole (15) to drain into the engine oil pan; When the piston (3) is in the second state, the fourth annular oil groove (37) is connected to the twelfth connecting oil port (214), so that after the VVT ​​advance adjustment oil chamber oil flows to the fourth annular oil groove (37), part of the oil is diverted to the twelfth connecting oil port (214), and then flows to the eleventh connecting oil port (213) and the second drain hole (15) to drain into the engine oil pan.

5. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: The inner wall of the housing (1) has a limiting groove (16) at one end of the installation port, and a limiting clamp (10) is installed in the limiting groove (16). The housing (1) has a limiting stop (17) at the first oil inlet (11).

6. The energy-saving oil control valve for internal oil circulation according to claim 5, characterized in that: A filter assembly (4) is installed between the flange (17) and the valve body (2).

7. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: Both the fifth connecting oil port (27) and the seventh connecting oil port (29) are slot-shaped through holes.

8. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: The third annular oil groove (35) is located between the second annular oil groove (34) and the fourth annular oil groove (37).

9. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: Both the valve body (2) and the piston (3) are hollow structures with one end open and the other end closed. The inner wall of the closed end of the valve body (2) is provided with a return spring mounting base (25), and the closed end of the piston (3) is provided with a return spring mounting seat (31). A return spring (6) is installed between the return spring mounting base (25) and the return spring mounting seat (31).

10. An energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: The outer wall of the valve body (2) is provided with a first connecting oil port (23) circumferentially at one end near the first oil inlet (11). The outer wall of the valve body (2) is provided with a second connecting oil port (22) radially connected to the first connecting oil port (23). The outer wall of the piston (3) is also provided with a first annular oil groove (32) and a second oil inlet (33). The second oil inlet (33) connects the first annular oil groove (32) and the hollow inner cavity of the piston (3). The hollow inner cavity of the piston (3) that connects the second oil inlet (33) and the fourth oil inlet (36) is the third oil inlet (310). The first oil inlet (11), the first connecting oil inlet (23), the second connecting oil inlet (22), the first annular oil groove (32), the second oil inlet (33), the third oil inlet (310), the fourth oil inlet (36), and the third annular oil groove (35) are all in a normally connected state when the piston (3) is in any state.

11. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: The first oil inlet (11) is connected to the fourth oil inlet (36) and is equipped with an oil inlet check valve.

12. The energy-saving oil control valve for internal oil circulation according to claim 11, characterized in that: The piston (3) has an axially formed plug mounting hole (38) at its open end. A plug (9) is press-fitted into the plug mounting hole (38). A one-way valve disc mounting seat (39) is formed between the piston (3) and the fourth oil inlet (36) and the second oil inlet (33). The oil inlet one-way valve includes a one-way valve disc (7) and a disc one-way valve spring (8). The one-way valve disc (7) is mounted on the one-way valve disc mounting seat (39), and the disc one-way valve spring (8) is mounted between the plug (9) and the one-way valve disc (7).

13. An engine system, characterized in that: Including an energy-saving oil control valve for internal oil circulation as described in any one of claims 1-12.

Images