Energy-saving engine oil control valve capable of achieving engine oil internal circulation and engine system

Abstract

Disclosed is an energy-saving engine oil control valve capable of achieving engine oil internal circulation, comprising a housing (1), a valve body (2) and a piston (3) which are all of a hollow structure. A first working oil hole (12) and a second working oil hole (13) are formed in the housing (1) in a radial direction; the valve body (2) is fixedly mounted in the housing (1); an annular one-way valve (5) is mounted in the valve body (2); the piston (3) is slidably mounted in the valve body (2); and the piston (3) has a first state and a second state. The problems in existing control valves of high manufacturing costs, high assembly difficulty, low durability and reliability of parts, and abnormal noise risk caused by structure defects can be solved.

Description

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

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on July 6, 2023, with application number 202310823461.8 and application name “An energy-saving oil control valve and engine system with internal oil circulation”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of oil control valves, and specifically relates to an energy-saving oil control valve with internal oil circulation and an engine system. Background Art

[0003] Variable valve timing adjustment of automobile engines refers to changing the phase relationship between the camshaft and the crankshaft so that the engine can obtain the best valve timing under operating conditions, which greatly improves the engine's fuel economy, power torque and emission characteristics.

[0004] Variable valve timing adjustment is mainly achieved by outputting oil pressure to the oil control valve through the oil pump, directly driving the VVT ​​(Variable Valve Timing) for phase adjustment. The disadvantage of this method is that it requires high oil pressure and causes large oil leakage, which increases the workload of the oil pump and thus increases the fuel consumption of the entire engine. Therefore, in the context of the extreme thermal efficiency requirements of hybrid engines, an energy-saving oil control valve is required.

[0005] Currently, there are some energy-saving oil control valves that can use camshaft torque to achieve internal oil circulation to reduce the workload of the oil pump. However, their implementation generally uses two or more one-way valves and sets the one-way valve in the piston to move synchronously with the piston. The structure is relatively complex, the manufacturing cost and assembly difficulty are high, and the durability and reliability of the components are low.

[0006] A Chinese invention patent (publication number: CN110318836A) discloses a radial circuit energy-saving oil control valve that can realize the oil internal circulation function. However, it uses two one-way valves to realize the oil internal circulation function, which has high manufacturing cost and assembly difficulty. In addition, the one-way valve that realizes the oil internal circulation function is arranged inside the piston. While realizing the oil inner ring function, the one-way valve will perform high-frequency reciprocating motion with the piston. The durability and reliability of the components are low and there is a risk of abnormal noise.

[0007] Summary of the Invention

[0008] The purpose of this application is to provide an energy-saving oil control valve with internal oil circulation, which is used to solve the problems of high manufacturing cost and assembly difficulty, low durability and reliability of components and the risk of abnormal noise caused by structural defects of existing control valves.

[0009] To achieve the above technical objectives, the technical solutions adopted in this application are as follows:

[0010] An energy-saving oil control valve with internal oil circulation,

[0011] It includes a shell, a valve body and a piston, all of which are hollow structures;

[0012] The housing is provided with a mounting port and a first oil inlet at both ends, and a first working oil hole and a second working oil hole are radially opened on the housing;

[0013] The valve body is fixedly installed in the housing, and a mounting groove is formed in the valve body, in which an annular one-way valve is installed. The side wall of the valve body is radially formed with a fifth oil communication port, a seventh oil communication port, a ninth oil communication port, a fourteenth oil communication port, a fourth oil communication port, and a sixth oil communication port that penetrate the side wall of the valve body;

[0014] The outer wall of the piston is provided with a third annular oil groove, a second annular oil groove and a fourth annular oil groove, and the piston is provided with a fourth oil inlet penetrating through the side wall of the piston at the third annular oil groove.

[0015] The first oil inlet is connected to the fourth oil inlet, the piston is slidably mounted in the valve body, and the oil inlet is connected to the fourth oil inlet through the hollow inner cavity of the piston;

[0016] The piston includes a first state and a second state;

[0017] When the piston is in the first state, the third annular oil groove is connected to the sixth communicating oil port, and the second working oil hole is connected to the fourth communicating oil port, the second annular oil groove, the ninth communicating oil port, and the fifth communicating oil port in sequence;

[0018] When the piston is in the second state, the third annular oil groove is connected to the fourth communicating oil port, and the first working oil hole is connected to the sixth communicating oil port, the fourth annular oil groove, the fourteenth communicating oil port, and the seventh communicating oil port in sequence.

[0019] It is further defined that the outer wall of the valve body has an eighth connecting oil port between the fifth connecting oil port and the ninth connecting oil port, and the outer wall of the valve body has a thirteenth connecting oil port between the seventh connecting oil port and the fourteenth connecting oil port. This structural design, through the eighth connecting oil port and the thirteenth connecting oil port provided on the outer wall of the valve body, respectively connects the fifth connecting oil port with the ninth connecting oil port, and the seventh connecting oil port with the fourteenth connecting oil port. It has a simple structure, is easy to manufacture, and has strong practicality. In fact, other connection methods can also be adopted according to actual needs, such as providing corresponding oil ports for connection on the inner wall of the housing, as long as the connection between the fifth connecting oil port and the ninth connecting oil port, and the connection between the seventh connecting oil port and the fourteenth connecting oil port can be achieved.

[0020] Furthermore, the housing is radially defined with a first oil drain hole, the valve body is radially defined with a third oil communication port, and the outer wall of the valve body is defined with a fifteenth oil communication port. The first oil drain hole communicates with the third oil communication port via the fifteenth oil communication port. This structural design, through the third oil connection port, destroys the enclosed space formed by the end of the piston and the end of the valve body, thereby achieving a degassing function and preventing the enclosed space from affecting the movement of the piston, thus providing greater practicality.

[0021] It is further defined that a second oil drain hole is radially provided on the shell, a tenth connecting oil port and a twelfth connecting oil port are radially provided on the valve body, and an eleventh connecting oil port is provided on the outer wall of the valve body between the tenth connecting oil port and the twelfth connecting oil port; the second oil drain hole is connected to the eleventh connecting oil port; when the piston is in the first state, the second annular oil groove is connected to the tenth connecting oil port; when the piston is in the second state, the fourth annular oil groove is connected to the twelfth connecting oil port. With such a structural design, through the connection between the twelfth connecting oil port and 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 unloading hole, thereby 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;

[0022] Similarly, through the connection between the tenth connecting oil port and the second annular oil groove, when the engine 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 unloading hole, thereby 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.

[0023] Furthermore, the inner wall of the housing has a limit groove at one end of the mounting opening, a limit clamp is installed in the limit groove, and the housing has a limit rib at the first oil inlet. This structural design, through the interaction of the limit clamp and the limit rib, completes the fixed installation between the valve body and the housing, resulting in a simple structure, easy installation, and strong practicality.

[0024] It is further defined that a filter assembly is installed between the rib and the valve body. This structural design, through the filter assembly at the first oil inlet, is squeezed by the valve body against the limiting rib of the housing to complete the installation, filtering the oil entering the control valve and preventing foreign particles in the oil from entering the interior of the oil control valve, which is highly practical.

[0025] Furthermore, the fifth and seventh oil communication ports are each slot-shaped through-holes. This structural design, in which the fifth and seventh oil communication ports are formed by slot-shaped through-holes, maximizes the flow area of ​​the fifth and seventh oil communication ports within the limited width of the mounting slot, thereby increasing the oil flow rate. This design provides a simple structure and enhanced practicality.

[0026] It is further defined that the third annular oil groove is located between the second annular oil groove and the fourth annular oil groove.

[0027] Further specified, the valve body and piston are both hollow structures with one end open and the other closed. A return spring mounting base is provided on the inner wall of the closed end of the valve body, and a return spring mounting seat is provided on the closed end of the piston. A return spring is installed between the return spring mounting base and the return spring mounting seat. This structural design allows the return spring installed between the valve body and the piston to cooperate with the electromagnet to push the piston. When the electromagnet releases its push on the piston, the piston can be reset under the action of the return spring. This simple structure and strong practicality.

[0028] It is further defined that the outer wall of the valve body is circumferentially provided with a first communicating oil port near one end of the first oil inlet, the outer wall of the valve body is radially provided with a second communicating oil port communicating with the first communicating oil port, the outer wall of the piston is further provided with a first annular oil groove and a second oil inlet, the second oil inlet is connected to the first annular oil groove and the hollow inner cavity of the piston, and the hollow inner cavity in the piston connecting the second oil inlet and the fourth oil inlet is the third oil inlet;

[0029] The first oil inlet, the first communicating oil port, the second communicating oil port, 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.

[0030] It is further defined that the first oil inlet is connected to the fourth oil inlet and is equipped with an oil inlet check valve. This structural design, by installing an oil inlet check valve in the oil inlet circuit, can effectively improve the response speed of the VVT ​​during the engine long-term idle start process and avoid the problem of abnormal VVT startup noise caused by oil shortage in the VVT ​​after the engine has been idle for a long time. At the same time, the oil inlet check valve installed in the oil inlet circuit can also effectively prevent the camshaft torque from generating high oil pressure in the VVT ​​oil chamber, which in turn causes oil inlet circuit backflow, thereby improving the variable valve timing adjustment speed.

[0031] It is further defined that the open end of the piston is axially provided with a plug mounting hole, a plug is interference-pressed into the plug mounting hole, and a one-way valve disc mounting seat is provided between the fourth oil inlet and the second oil inlet of the piston.

[0032] The oil inlet check valve includes a check valve disc and a disc check valve spring. The check valve disc is mounted on a check valve disc mounting seat, and the disc check valve spring is mounted between the plug and the check valve disc. This structural design completes the installation of the oil inlet check valve by interfering with the plug, which is press-fitted into the plug mounting hole. The design offers a simple structure, convenient installation, and strong practicality.

[0033] The present application also discloses an engine system, including the above-mentioned energy-saving oil control valve for internal oil circulation.

[0034] The above technical solution has the following advantages:

[0035] The annular one-way valve provided in the valve body cooperates with the ninth oil communication port, the eighth oil communication port, the fifth oil communication port / the fourteenth oil communication port, the thirteenth oil communication port, and the seventh oil communication port provided on the valve body, which are connected in sequence, to realize the internal circulation function of the engine oil, thereby reducing the oil consumption during adjustment;

[0036] Compared to the technical solution of placing the check valve inside the piston, the annular check valve is installed in the valve body. While achieving the oil circulation function, it does not reciprocate with the piston at high frequency. This improves the reliability of the component and reduces the risk of abnormal noise.

[0037] An annular one-way valve replaces the existing two one-way valves to achieve the oil internal circulation function, reducing manufacturing costs and assembly difficulty;

[0038] The oil inlet check valve installed in the oil inlet line realizes the oil storage function inside the VVT ​​oil chamber, effectively improving the response speed of the VVT ​​during the long-term engine startup process and avoiding the problem of abnormal VVT startup noise caused by oil shortage inside the VVT ​​after the engine has been idle for a long time.

[0039] The oil inlet check valve installed in the oil inlet line can also effectively prevent the camshaft torque from generating high oil pressure in the VVT ​​oil chamber, which in turn causes oil inlet line backflow, thereby improving the variable valve timing adjustment speed;

[0040] Through the connection between the twelfth oil communication port and 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 oil communication port, the eleventh oil communication port, and the second oil discharge hole, thereby 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;

[0041] Similarly, through the connection between the tenth oil communication port and the second annular oil groove, when the oil in the VVT ​​hysteresis 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 oil communication port, the eleventh oil communication port, and the second oil unloading hole, thereby avoiding the problem of negative camshaft torque being unable to quickly drive the VVT ​​rotor to rotate due to excessive oil pressure in the VVT ​​hysteresis adjustment oil chamber;

[0042] The fifth and seventh connecting oil ports are formed by slot-shaped through holes, which can increase the flow area of ​​the fifth and seventh connecting oil ports as much as possible when the width of the installation groove is limited, thereby increasing the oil flow rate. The structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] FIG1 is an exploded schematic diagram of the structure of an energy-saving oil control valve with internal oil circulation and an engine system according to an embodiment of the present invention;

[0045] FIG2 is a cross-sectional structural diagram of an embodiment of an energy-saving oil control valve with internal oil circulation and an engine system according to the present application;

[0046] FIG3 is a schematic cross-sectional view of a housing portion of an embodiment of an energy-saving oil control valve with internal oil circulation and an engine system according to the present application;

[0047] FIG4 is a structural schematic diagram of a valve body portion of an energy-saving oil control valve with internal oil circulation and an engine system according to the present application;

[0048] FIG5 is a second structural diagram of the valve body portion of an energy-saving oil control valve with internal oil circulation and an engine system according to the present application;

[0049] FIG6 is a cross-sectional structural diagram of a valve body portion of an energy-saving oil control valve with internal oil circulation and an engine system embodiment of the present application;

[0050] FIG7 is a schematic cross-sectional view of the piston portion of an embodiment of an energy-saving oil control valve and an engine system with internal oil circulation according to the present application;

[0051] FIG8 is a schematic structural diagram of a filter assembly portion of an energy-saving oil control valve and an engine system embodiment of the present application for internal oil circulation;

[0052] FIG9 is a schematic diagram of the assembly structure of an energy-saving oil control valve with internal oil circulation and an engine system embodiment of the present application, which is assembled on a VVT and a camshaft;

[0053] FIG10 is a schematic structural diagram of an embodiment of an energy-saving oil control valve and an engine system with internal oil circulation according to the present application;

[0054] FIG11 is a schematic diagram of the cross-sectional structure along the AA direction in FIG10 in working mode 1;

[0055] FIG12 is a schematic diagram of the cross-sectional structure along the BB direction in FIG10 under working mode 1;

[0056] FIG13 is a schematic diagram of the cross-sectional structure in the CC direction of FIG10 in working mode 1;

[0057] FIG14 is a schematic diagram of the cross-sectional structure along the AA direction in FIG10 in working mode 2;

[0058] FIG15 is a schematic diagram of the cross-sectional structure along the BB direction in FIG10 under working mode 2;

[0059] FIG16 is a schematic diagram of the cross-sectional structure in the CC direction of FIG10 under working mode 2. FIG16 is a schematic diagram of the cross-sectional structure in the CC direction of FIG10

[0060] Explanation of Reference Numerals: 1-housing; 11-first oil inlet; 12-first working oil hole; 13-second working oil hole; 14-first oil drain hole; 15-second oil drain hole; 16-limiting groove; 17-limiting rib; 2-valve body; 21-mounting groove; 22-second connecting oil port; 23-first connecting oil port; 24-third connecting oil port; 25-return spring mounting base; 26-fourth connecting oil port; 27-fifth connecting oil port; 28-sixth connecting oil port; 29-seventh connecting oil port; 210-eighth connecting oil port; 211-ninth connecting oil port; 212-tenth connecting oil port; 213-eleventh connecting oil port; 214-twelfth connecting oil port; 215-thirteenth connecting oil port; 216-fourteenth connecting oil port; 217-fifteenth connecting oil port; 3-Piston; 31-Return spring mounting seat; 32-First annular oil groove; 33-Second oil inlet; 34-Second annular oil groove; 35-Third annular oil groove; 36-Fourth oil inlet; 37-Fourth annular oil groove; 38-Plug mounting hole; 39-Check valve disc mounting seat; 310-Third oil inlet; 4-Strainer assembly; 41-Strainer seat; 42-Strainer; 5-Annular check valve; 6-Return spring; 7-Check valve disc; 8-Disc check valve spring; 9-Plug; 10-Limiting clamp; 100-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-Camshaft. DETAILED DESCRIPTION

[0061] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions of the specification, similar or identical parts are numbered the same. Implementations not shown or described in the drawings are forms known to those of ordinary skill in the art. In addition, directional terms mentioned in the embodiments, such as "upper," "lower," "top," "bottom," "left," "right," "front," "back," etc., are only used to refer to the directions in the drawings and are not intended to limit the scope of protection of this application.

[0062] As shown in Figures 1 and 2, an energy-saving oil control valve with internal oil circulation in the present application is

[0063] It includes a housing 1, a valve body 2 and a piston 3, all of which are hollow structures.

[0064] As shown in FIG3 , a mounting port and a first oil inlet 11 are formed at both ends of the housing 1 , and 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 are radially opened on the housing 1 ;

[0065] As shown in Figures 2, 4 to 6, the valve body 2 is further provided with a third oil communication port 24 in the radial direction, and the outer wall of the valve body 2 is provided with a fifteenth oil communication port 217. The first oil drain hole 14 is connected to the third oil communication port 24 via the fifteenth oil communication port 217.

[0066] The valve body 2 further has a tenth oil communication port 212 and a twelfth oil communication port 214 radially formed therein. An eleventh oil communication port 213 is formed on the outer wall of the valve body 2 between the tenth oil communication port 212 and the twelfth oil communication port 214.

[0067] The second oil drain hole 15 is connected to the eleventh oil communication port 213;

[0068] As shown in FIG13 , when the piston 3 is in the first state, the second annular oil groove 34 is in communication with the tenth oil communication port 212 ;

[0069] As shown in FIG. 16 , when the piston 3 is in the second state, the fourth annular oil groove 37 is in communication with the twelfth oil communication port 214 .

[0070] The first oil inlet 11 is connected to the fourth oil inlet 36 and is installed with an oil inlet check valve. A plug mounting hole 38 is axially opened at the open end of the piston 3. A plug 9 is installed in the plug mounting hole 38 by interference pressure. A check valve disc mounting seat 39 is opened between the fourth oil inlet 36 and the second oil inlet 33.

[0071] The oil inlet check valve includes a check valve disc 7 and a disc check valve spring 8.

[0072] 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 .

[0073] A filter assembly 4 is installed between the rib 17 and the valve body 2, and the filter assembly 4 includes a filter seat 41 and a filter 42;

[0074] The inner wall of the housing 1 is provided with a limiting groove 16 at one end of the installation opening, and a limiting clamp 10 is installed in the limiting groove 16.

[0075] The housing 1 is provided with a limiting rib 17 at the first oil inlet 11.

[0076] The valve body 2 is fixedly installed in the housing 1 through the limiting clamp 10 and the limiting retaining edge 17;

[0077] As shown in Figures 2 to 6, a mounting groove 21 is provided in the valve body 2, and an annular one-way valve 5 is installed in the mounting groove 21.

[0078] The valve body 2 is provided with a fifth oil communication port 27 and a seventh oil communication port 29 at the mounting groove 21, which penetrate the side wall of the valve body 2.

[0079] The fifth oil communication port 27 and the seventh oil communication port 29 are both slot-shaped through holes;

[0080] The side wall of the valve body 2 is further radially provided with a ninth oil communication port 211 and a fourteenth oil communication port 216 penetrating the side wall of the valve body 2.

[0081] The outer wall of the valve body 2 defines an eighth oil communication port 210 between the fifth oil communication port 27 and the ninth oil communication port 211.

[0082] The outer wall of the valve body 2 is provided with a thirteenth oil communication port 215 between the seventh oil communication port 29 and the fourteenth oil communication port 216.

[0083] The valve body 2 is further provided with a fourth oil communication port 26 and a sixth oil communication port 28 in radial direction.

[0084] The first working oil hole 12 is connected to the sixth communicating oil port 28, and the second working oil hole 13 is connected to the fourth communicating oil port 26.

[0085] As shown in Figures 2 and 7, 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 penetrating the side wall of the piston 3 at the third annular oil groove 35.

[0086] The first oil inlet 11 is connected to the fourth oil inlet 36.

[0087] The third annular oil groove 35 is located between the second annular oil groove 34 and the fourth annular oil groove 37 .

[0088] The piston 3 is slidably installed in the valve body 2. Both the valve body 2 and the piston 3 are hollow structures with one end open and the other end closed.

[0089] The inner wall of the closed end of the valve body 2 is provided with a return spring mounting base 25.

[0090] The closed end of the piston 3 is provided with a return spring mounting seat 31.

[0091] A return spring 6 is installed between the return spring mounting base 25 and the return spring mounting seat 31;

[0092] The oil inlet 11 is connected to the fourth oil inlet 36 through the hollow inner cavity of the piston 3.

[0093] The piston 3 includes a first state and a second state;

[0094] As shown in Figures 11 to 13, when the piston 3 is in the first state, the third annular oil groove 35 is connected to the sixth communicating oil port 28, and the second working oil hole 13 is connected to the fourth communicating oil port 26, the second annular oil groove 34, the ninth communicating oil port 211, the eighth communicating oil port 210, and the fifth communicating oil port 27 in sequence;

[0095] As shown in Figures 14 to 16, when the piston 3 is in the second state, the third annular oil groove 35 is connected to the fourth communicating oil port 26, and the first working oil hole 12 is connected to the sixth communicating oil port 28, the fourth annular oil groove 37, the fourteenth communicating oil port 216, the thirteenth communicating oil port 215, and the seventh communicating oil port 29 in sequence.

[0096] A first oil communication port 23 is circumferentially formed on the outer wall of the valve body 2 near one end of the first oil inlet 11.

[0097] The outer wall of the valve body 2 is radially provided with a second oil communication port 22 which is in communication with the first oil communication port 23.

[0098] The outer wall of the piston 3 is further provided with a first annular oil groove 32 and a second oil inlet 33. The second oil inlet 33 is connected to the first annular oil groove 32 and the hollow inner cavity of the piston 3.

[0099] The hollow inner cavity in the piston 3 that connects the second oil inlet 33 and the fourth oil inlet 36 is the third oil inlet 310.

[0100] The first oil inlet 11, the first communicating oil port 23, the second communicating oil port 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.

[0101] The first oil inlet 11 is connected to the fourth oil inlet 36 and is installed with an oil inlet check valve. A plug mounting hole 38 is axially opened at the open end of the piston 3. A plug 9 is installed in the plug mounting hole 38 by interference pressure. A check valve disc mounting seat 39 is opened between the fourth oil inlet 36 and the second oil inlet 33.

[0102] The oil inlet check valve includes a check valve disc 7 and a disc check valve spring 8.

[0103] 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 .

[0104] An engine system includes the above-mentioned energy-saving oil control valve for internal oil circulation.

[0105] In this embodiment, the oil control valve has three operating modes: variable valve timing phase advance adjustment, variable valve timing phase lag adjustment, and variable valve timing phase hold adjustment. In the variable valve timing phase advance adjustment and variable valve timing phase lag adjustment modes, the camshaft torque can be used to achieve an internal oil circulation function. It should also be understood that the variable valve timing phase hold operating mode has extremely low oil consumption. In this operating mode, only the amount of oil leaked from the gaps between the components in the variable valve timing phase adjustment system needs to be replenished, so there is no need to achieve an internal oil circulation function. This application will not further describe these operating modes. The two operating modes of variable valve timing phase advance adjustment and variable valve timing phase lag adjustment will be further described in detail with reference to the accompanying drawings.

[0106] As shown in Figure 9, the oil control valve is assembled on the VVT ​​rotor 200 and is fixed to the camshaft 900 by a threaded connection. The electromagnet 500 is assembled on the front cover (not shown in the figure). The oil enters the camshaft 900 from the cylinder head oil circuit (not shown in the figure), and then enters the VVT ​​advance oil chamber (the oil circuit is indicated by the solid arrow in the figure). At the same time as the oil enters, the oil in the VVT ​​lag oil chamber leaks into the oil control valve for internal oil circulation and oil leakage (the oil circuit is indicated by the dotted arrow in Figure 9).

[0107] Working mode 1, variable valve timing phase advance adjustment:

[0108] As shown in Figures 11, 12 and 13, the ECU executes the variable valve timing phase advance adjustment command and transmits 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 phase 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 oil drain hole 15 are in a normally connected state;

[0109] Due to the characteristics of the annular one-way valve 5, the engine oil cannot flow from the third annular oil groove 35 to the fifth communicating oil port 27, thereby preventing the engine oil from flowing from the oil inlet passage into the VVT ​​lag adjustment oil chamber 400 during variable valve timing advance adjustment. Furthermore, the engine oil can flow from the fifth communicating oil port 27 to the third annular oil groove 35 under the action of the pressure difference.

[0110] The solid arrows in Figures 11, 12, and 13 indicate the direction of the oil inlet path. The oil flows from the first oil inlet port 11 through the filter assembly 4 into the first connecting oil port 23, and then flows through the second connecting oil port 22, the first annular oil groove 32, the second oil inlet port 33, and the third oil inlet port 310 in sequence. Under the action of the oil inlet pressure, the one-way valve disc 7 overcomes the spring force of the disc one-way valve spring 8 to open, and then flows through the fourth oil inlet port 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 achieve variable valve timing phase advance adjustment;

[0111] When the system is in the positive camshaft torque of 800, the torque is applied to the VVT ​​rotor 200 to generate high oil pressure in the VVT ​​advance adjustment oil chamber 300. When the high oil pressure is greater than the oil pressure in the oil inlet circuit, the one-way valve disc 7 is closed, effectively avoiding the backflow of the oil inlet circuit, thereby improving the VVT ​​variable valve timing adjustment speed; further, while the engine oil pushes the VVT ​​rotor 200 to adjust the variable valve timing phase in advance, the VVT ​​lag adjustment oil chamber 400 is in an oil leakage state, as shown in Figures 11 and 12 The dotted arrow indicates the oil drain path. The oil in the VVT ​​hysteresis adjustment 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 reach the inlet of the annular check valve 5. At this time, under the action of the negative camshaft torque 700, the VVT ​​hysteresis adjustment 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, realizing the oil internal circulation function.

[0112] In addition to a portion of the oil in the VVT ​​lag adjustment oil chamber 400 entering the VVT ​​advance adjustment oil chamber 300 through the oil internal circulation oil circuit for recycling, the other portion of the oil is discharged into the engine oil pan through the second oil drain hole 15 (not shown in the figure). It should be understood that it is necessary to set up a separate oil drain circuit. It can be understood that the camshaft torque changes periodically. When the system is in the positive camshaft torque of 800, the VVT ​​lag adjustment oil chamber 400 cannot generate high oil pressure to open the annular one-way valve 5 to realize the oil internal circulation function. Yes, at this time, the oil in the VVT ​​lag adjustment oil chamber 400 must be drained through the oil drain line so that the oil pressure in the VVT ​​advance adjustment oil chamber 300 can drive the VVT ​​rotor 200 to perform variable valve timing phase advance adjustment. As shown in FIG13 , after the oil in the VVT ​​lag adjustment oil chamber 400 flows into the second annular oil groove 34 , 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 be drained into the engine oil pan;

[0113] Working mode 2, variable valve timing phase lag adjustment:

[0114] As shown in Figures 14, 15 and 16, the ECU executes the variable valve timing phase lag adjustment command and transmits 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 oil drain hole 15 are in a normally connected state.

[0115] Due to the characteristics of the annular one-way valve 5, the engine oil cannot enter the seventh connecting oil port 29 from the third annular oil groove 35, thereby preventing the engine oil from entering the VVT ​​advance adjustment oil chamber 300 from the oil inlet passage 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 oil port 29 under the action of the pressure difference.

[0116] The solid arrows in Figures 14, 15, and 16 indicate the direction of the oil inlet path. The engine oil flows from the first oil inlet port 11 through the filter assembly 4 into the first connecting oil port 23, and then flows through the second connecting oil port 22, the first annular oil groove 32, the second oil inlet port 33, and the third oil inlet port 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 to open, and then flows through the fourth oil inlet port 36, the third annular oil groove 35, the fourth connecting oil port 26, and the second working oil hole 13 to enter the VVT ​​lag adjustment oil chamber 400 to drive the VVT ​​rotor 200 to achieve variable valve timing phase lag adjustment;

[0117] When the system is in the negative camshaft torque 700, the torque applied to the VVT ​​rotor 200 generates high oil pressure in the VVT ​​hysteresis adjustment oil chamber 400. When the high oil pressure is greater than the oil pressure in the oil inlet circuit, the one-way valve disc 7 closes, effectively preventing the oil inlet circuit from flowing back, thereby improving the VVT ​​variable valve timing adjustment speed.

[0118] 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 leakage state. Combined with the direction of the oil leakage oil path indicated by the dotted arrows in Figures 14 and 15, the engine oil in the VVT ​​advance adjustment oil chamber flows 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 in sequence to reach 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 engine oil enters the third annular oil groove 35 and merges with the oil inlet path, realizing the engine oil internal circulation function;

[0119] It should be further explained that, in addition to a portion of the oil in the VVT ​​advance adjustment oil chamber 300 entering the VVT ​​lag adjustment oil chamber 400 through the oil circulation circuit for recycling, the other portion of the oil is discharged into the engine oil pan through the second oil drain hole 15 (not shown in the figure). It should be understood that it is necessary to set up a separate oil drain circuit because the camshaft torque varies periodically. When the system is in a negative camshaft torque of 700, the VVT ​​advance adjustment oil chamber 300 cannot generate high oil pressure to open the annular single The valve 5 realizes the oil internal circulation function. At this time, the oil in the VVT ​​advance adjustment oil chamber 300 must be discharged through the oil drain circuit to enable the oil pressure in the VVT ​​lag adjustment oil chamber 400 to drive the VVT ​​rotor 200 to perform variable valve timing phase lag adjustment. As shown in Figure 16, 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 oil drain hole 15 to be discharged into the engine oil pan.

[0120] Further combined with Figure 11, the internal oil storage function of the VVT ​​oil chamber implemented in the present application is explained. Taking the exhaust VVT as an example, after the engine is shut down, the VVT ​​is in the most advanced position of the variable valve timing phase as shown in Figure 11. At this time, due to the disc-type one-way valve structure inside the piston, 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 an oil storage chamber. The engine oil will not be able to flow back to the cylinder head and cylinder block oil circuit through the oil control valve inlet oil circuit, effectively improving the response speed of the VVT ​​for variable valve timing phase adjustment during the long-term startup of the engine and avoiding the abnormal noise problem of the starting VVT caused by lack of oil inside the VVT ​​after the engine has been idle for a long time.

[0121] As shown in Figure 13, the piston 3 reciprocates in the valve body 2 through the third connecting oil port 24, the fifteenth connecting oil port 217, and the first oil drain hole 14 to achieve the air release function, thereby preventing the front end of the piston 3 and the inner cavity of the valve body 2 from forming a closed cavity that hinders the reciprocating motion of the piston 3. At the same time, the oil that leaks into the cavity formed by the front end of the piston 3 and the valve body 2 through the clearance of the moving pair can also be discharged through this oil circuit.

[0122] The assembly sequence of the control valve is as follows: the filter assembly 4 is installed into the limiting rib 17 in the housing 1, the filter assembly 4 and the limiting rib 17 are provided with an anti-fool-proof 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, further the annular one-way valve 5 is installed into the annular one-way valve mounting groove 21, further the valve body 2 is installed into the interior of the housing 1, the valve body 2 and the filter assembly 4 end face fitting position are provided with an anti-fool-proof 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, further the return spring 6 is installed into the return spring mounting base 25, further the one-way valve disc 7 is installed on the one-way valve disc mounting seat 39, further the one-way valve spring 8 is installed on the plug 9, further the plug 9 is interference pressed into the plug mounting hole 38, further the piston 3 is installed into the valve body 2, further the limiting clamp 10 is assembled, the assembly process of the oil control valve is smooth and the assembly is simple.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy-saving oil control valve for internal oil circulation, characterized in that: It comprises a housing (1), a valve body (2) and a piston (3), all of which are hollow structures; The housing (1) has a mounting port and a first oil inlet (11) formed at both ends thereof, and a first working oil hole (12) and a second working oil hole (13) radially opened on the housing (1); The valve body (2) is fixedly installed in the housing (1); a mounting groove (21) is provided in the valve body (2); an annular one-way valve (5) is installed in the mounting groove (21); 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) are radially provided on the side wall of the valve body (2); 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) penetrating 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 mounted in the valve body (2); the oil inlet (11) is connected to the fourth oil inlet (36) via the hollow inner cavity of the piston (3); The piston (3) comprises 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 communicating oil port (28), and the second working oil hole (13) is connected to the fourth communicating oil port (26), the second annular oil groove (34), the ninth communicating oil port (211), and the fifth communicating oil port (27) in sequence; 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.

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

3. The energy-saving oil control valve for internal oil circulation according to claim 1 is 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 oil communication port (24), the outer wall of the valve body (2) is provided with a fifteenth oil communication port (217), and the first oil drain hole (14) is connected to the third oil communication port (24) via the fifteenth oil communication port (217).

4. 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 second oil drain hole (15); the valve body (2) is also radially provided with a tenth connecting oil port (212) and a twelfth connecting oil port (214); an eleventh connecting oil port (213) is provided on the outer wall of the valve body (2) 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); when the piston (3) is in the second state, the fourth annular oil groove (37) is connected to the twelfth connecting oil port (214).

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) is provided with a limiting groove (16) at one end of the installation opening, a limiting clamp (10) is installed in the limiting groove (16), and the housing (1) is provided with a limiting retaining edge (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 retaining edge (17) and the valve body (2).

7. The energy-saving oil control valve for internal oil circulation according to claim 1, characterized in that: The fifth oil communication port (27) and the seventh oil communication port (29) are both 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: The valve body (2) and the piston (3) are both 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. The 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) in the circumferential direction near one end of the first oil inlet (11); the outer wall of the valve body (2) is provided with a second connecting oil port (22) in the radial direction and 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 in the piston (3) connecting 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 port (23), the second connecting oil port (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 communicated with the fourth oil inlet (36) and is provided 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 open end of the piston (3) is axially provided with a plug mounting hole (38), and a plug (9) is installed in the plug mounting hole (38) by interference pressure. The piston (3) is provided with a one-way valve disc mounting seat (39) between the fourth oil inlet (36) and the second oil inlet (33). The oil inlet one-way valve comprises a one-way valve disc (7) and a disc one-way valve spring (8). The one-way valve disc (7) is installed on the one-way valve disc mounting seat (39), and the disc one-way valve spring (8) is installed between the plug (9) and the one-way valve disc (7).

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

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