A central engine oil control valve

Abstract

The application provides a central engine oil control valve, which comprises a shell, a valve core and a support pipe, an oil passage is arranged between the outer wall of the support pipe and the inner wall of a mounting hole, the outer wall of the valve core is provided with a first annular groove, a second annular groove, a third annular groove and a fourth annular groove; the first annular groove and the third annular groove are communicated with the oil passage, a one-way valve group is arranged between the outer wall of the support pipe and the inner wall of the mounting hole, the one-way valve group comprises a first one-way valve for controlling the fourth annular groove to be one-way conducted to the side of the oil passage; the side wall of the shell is provided with a first oil outlet hole and a second oil outlet hole; the shell is further provided with an oil inlet passage communicated with the fourth annular groove; the side wall of the support pipe is provided with an oil discharge hole, and the end of the valve core away from the shell is provided with an oil outlet passage. The application provides a central engine oil control valve, which transfers part of the complex functions on the original slide valve sleeve to the control valve shell and the valve core, so that the slide valve sleeve is saved and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of oil control valve technology, specifically a central oil control valve. Background Technology

[0002] The central oil control valve is the core control component of the engine VVT ​​system. It has a complex structure and requires high manufacturing precision. The control valve body, spool sleeve, control valve core, and hydraulic check valve are the core components of the central control valve. They play an important role in tightening bolts and distributing oil circuits to achieve system control functions. The manufacturing precision of the control valve body, spool sleeve, and control valve core directly affects the performance of the control valve.

[0003] Currently, most of the complex functions of control valve designs on the market are concentrated on the spool valve and valve core sleeve. For example, by setting irregular holes on the outer wall of the spool valve sleeve, combined with the structure of the valve core, the distribution of oil circuits is realized, which makes the shape and precision requirements of the parts very high.

[0004] For example, patent CN218626380U discloses a centrally located oil control valve for a phase shifter, comprising a valve body, a valve sleeve, and a valve plug. A filter screen, a one-way valve base, and a valve sleeve are sequentially installed from front to back in the inner bore of the valve body. The rear end of the valve sleeve is limited by a retaining spring, which is fixed in an annular groove at the rear of the valve body. An oil hole is provided at the center of the one-way valve base, and a one-way valve plate is installed inside the oil hole. A small compression spring is provided between the front end of the valve sleeve and the one-way valve plate. A valve plug is installed in the inner cavity of the valve sleeve, and a large compression spring is provided between the front end of the valve plug and the valve sleeve. The rear end of the valve plug is limited by a retaining spring. Oil inlet grooves are provided on the outer surfaces of the left and right sides of the valve sleeve, extending from the front end of the valve sleeve to the middle and rear part of the valve sleeve, and penetrating the side wall of the valve sleeve through an oil inlet hole to connect to the inside of the valve sleeve. A control oil passage is provided on the valve sleeve, and an annular oil passage groove is provided in the middle of the valve plug. An oil outlet is provided on the valve body. In addition to the complex spool valve sleeve, the bottom of the valve chamber also contains a one-way valve plate, a spring, and other structures, resulting in numerous parts and low assembly efficiency.

[0005] In addition, there are two main methods for processing spool valve sleeves in existing technologies. One is to directly machine them from steel or aluminum bars, and the other is to machine a thin inner liner from steel, and then use rubber injection molding to form a complete spool valve sleeve on the outer and bottom walls. First, due to its complex structure, the machining process requires high-precision CNC lathes, which is difficult and costly. Second, with the continuous development of existing technologies, higher requirements are placed on the design of spool valve sleeves. Their functions are becoming more and more complex, and the length of the spool valve sleeve is also increasing. The precision machining of the blind hole in the inner diameter of the spool valve sleeve has become an insurmountable problem in existing technologies. Traditional precision reaming processes are difficult to meet design requirements, while honing is difficult to use with small relief grooves. The rubber injection molding process is long and the dimensional stability of the parts is poor. Therefore, the manufacturing feasibility of spool valve sleeve products is poor, the unit price of parts is high, resulting in a very high total cost of control valves. Summary of the Invention

[0006] The problem solved by this invention is to overcome at least one defect in the prior art by providing a central oil control valve. By optimizing the valve core structure and combining it with the one-way valve function, the valve core eliminates the need for a spool sleeve, transferring some complex functions that were originally integrated on the spool sleeve to the control valve housing and valve core, thereby reducing production costs.

[0007] To address the aforementioned problems, this invention provides a central oil control valve, comprising a housing and a valve core. One end of the valve core is slidably fitted within the valve cavity of the housing. The portion of the valve core located within the housing has a mounting hole. A hollow support tube is fitted into the mounting hole. An oil passage is provided between the outer wall of the support tube and the inner wall of the mounting hole. The outer wall of the valve core has a first annular groove, a second annular groove, a third annular groove, and a fourth annular groove, spaced axially and all communicating with the mounting hole. The first and third annular grooves communicate with the oil passage. A one-way valve assembly is provided between the outer wall of the support tube and the inner wall of the mounting hole. The one-way valve assembly includes a first one-way valve for controlling the fourth annular groove to unidirectionally flow towards the oil passage. A first oil outlet and a second oil outlet are provided on the side wall of the housing, respectively communicating with the first working chamber and the second working chamber of the phaser. An oil inlet channel communicating with the fourth annular groove is also provided on the housing. An oil drain hole is provided on the side wall of the support tube for communicating with the second annular groove and its inner hole. An oil outlet channel communicating with the inner hole of the support tube is provided on the side wall of the valve core away from the housing.

[0008] When the valve core is in the first state, the oil inlet channel, the oil passage, the third annular groove, and the second oil outlet are connected in sequence, and the first oil outlet, the second annular groove, the drain hole, and the oil outlet channel are connected in sequence; when the valve core is in the second state, the oil inlet channel, the oil passage, the first annular groove, and the first oil outlet are connected in sequence; the second oil outlet, the second annular groove, the drain hole, and the oil outlet channel are connected in sequence; when the valve core is in the third state, the oil inlet channel, the oil passage, the first annular groove, the third annular groove, the first oil outlet, and the second oil outlet are connected.

[0009] The central oil control valve of the present invention has the following advantages compared with the prior art:

[0010] The oil control valve structure of this invention, through the structure of a novel valve core, combined with the oil inlet channel on the housing and the on / off state of the two ends of the one-way valve assembly, realizes the switching of three states, achieving the function of a traditional oil control valve. Furthermore, the entire control valve structure eliminates the slide valve sleeve structure and the oil inlet one-way valve structure formed by the diaphragm and spring at the bottom of the valve chamber. The function of the slide valve sleeve in the traditional oil control valve structure is integrated into the valve core and housing structure, making the structure simpler, easier to process, and lower in manufacturing cost.

[0011] As an improvement, the first one-way valve includes an elastic diaphragm, one end of which is connected to the support tube. The bottom of the fourth annular groove has a first through-hole communicating with the oil passage, and the other end of the elastic diaphragm abuts and seals against the inner wall of the mounting hole at a position corresponding to the first through-hole at the bottom of the fourth annular groove. In this improved structure, the one-way valve function can be achieved using only a simple elastic diaphragm structure, enabling switching of the oil circuit when the valve core is in different states. The structure is simple and the cost is low.

[0012] In a further improvement, the elastic diaphragm is a first spring sheet, and a limiting groove is formed on the outer wall of the support tube. A spring sheet connector is installed in the limiting groove, and the spring sheet is integrally formed on the spring sheet connector. In the above improved structure, the one-way valve is a spring-type structure, realizing an integrated design of the one-way valve and valve core, reducing the number of parts, improving assembly efficiency, and thus reducing costs.

[0013] In a further improvement, a second spring sheet is integrally formed on the spring connector. A first through hole, connecting to the oil passage, is opened at the bottom of the second annular groove. The second spring sheet abuts against and seals the inner wall of the mounting hole at a position corresponding to the first through hole at the bottom of the second annular groove, forming a second one-way valve for controlling the unidirectional flow of oil in the second annular groove towards the oil passage. This enables the oil in the first working chamber to circulate internally to the second working chamber during the first operating state. In the above improved structure, the second one-way valve primarily enables the oil in the first working chamber to circulate back internally to the first working chamber, thus reducing external oil input and achieving oil saving.

[0014] In a further improvement, the mounting hole is a blind hole, and an elastic reset element is provided between one end of the valve core near the bottom of the blind hole and the bottom wall of the blind hole. The other end of the valve core is limited by a snap ring to the inner wall of the opening end of the blind hole. In the above improved structure, the elastic reset element allows the valve core to reset flexibly and stably.

[0015] In a further improvement, the housing has several circumferentially distributed oil inlet holes at one end near the bottom wall of the blind hole, which connect to the mounting hole to form the oil inlet channel. In the above improved structure, the oil inlet position is designed to better accommodate the spring-loaded check valve structure, simplifying the check valve structure and reducing costs.

[0016] In a further improvement, a filter screen is connected to the exterior of the housing near the oil inlet to cover the oil inlet. In this improved structure, the filter screen effectively filters impurities in the engine oil, preventing impurities from clogging the valve core's movement clearance and affecting the flexible switching of the oil circuit.

[0017] In a further improvement, a limiting step is provided at one end of the mounting hole near the oil outlet channel. One end of the support tube abuts against the limiting step, one end of the elastic reset member abuts against the other end of the support tube, and the other end of the elastic reset member abuts against the bottom wall of the blind hole. An oil discharge check valve is provided between the end of the support tube near the oil outlet hole and the oil outlet channel. In the above improved structure, the limiting step ensures accurate positioning of the support tube and simultaneously limits the position of the oil discharge check valve.

[0018] In a further improvement, a mounting boss is integrally formed on the outer wall of the support tube, and the limiting groove is recessed within the mounting boss. In the above improved structure, the mounting boss structure ensures the strength of the connection structure between the spring connector and the support tube.

[0019] In a further improvement, a limiting block is formed protruding outward on the outer wall of the support tube. The outer end face of the limiting block slides in engagement with the inner wall of the mounting hole, and the oil drain hole is formed on the limiting block. A positioning protrusion is provided on the outer wall of the support tube near the opening end of the blind hole, and a positioning groove is formed on the inner wall of the mounting hole. When the support tube is axially inserted into the mounting hole until the positioning protrusion and the positioning groove are in place, the oil drain hole is aligned with the second through hole at the bottom of the second annular groove. In the above improved structure, the positioning protrusion is essentially a foolproof mechanism, ensuring that the support tube can be inserted into the mounting hole at the prepared angle and achieving communication between the oil drain hole and the inner cavity of the support tube. In addition, the limiting block is provided to ensure that the oil drain hole can accurately communicate with the second through hole at the bottom of the second annular groove.

[0020] Furthermore, other improvements and advantages of the invention will be set forth in the following detailed description and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained through the structures particularly pointed out in the description and drawings. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the central oil control valve of the present invention;

[0022] Figure 2 for Figure 1 Half-section view of the central oil control valve in the middle;

[0023] Figure 3 This is a schematic diagram of the valve core structure in this invention;

[0024] Figure 4 This is a schematic diagram of the disassembled structure of the support tube and the one-way valve assembly in this invention;

[0025] Figure 5 This is a half-sectional view of the valve core of the central oil control valve of the present invention in the first state.

[0026] Figure 6 This is a half-sectional view of the valve core of the central oil control valve of the present invention in the second state.

[0027] Figure 7 This is a half-sectional view of the valve core of the central oil control valve of the present invention in the third state.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Housing; 2. Valve core; 3. Mounting hole; 4. Support tube; 5. Oil passage; 6. First annular groove; 7. Second annular groove; 8. Third annular groove; 9. Fourth annular groove; 10. First oil outlet; 11. Second oil outlet; 12. Drain hole; 13. Oil passage; 14. First spring plate; 15. First through hole; 16. Limiting groove; 17. Spring plate connector; 18. Elastic reset component; 19. Snap ring; 20. Oil inlet; 21. Filter screen; 22. Limiting step; 23. Drain check valve; 24. Mounting boss; 25. Limiting block; 26. Positioning protrusion; 27. Second through hole; 28. Third through hole; 29. ​​Riveted positioning post; 30. Positioning hole; 31. Manifold groove; 32. Elastic support plate; 33. Second spring plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer and more complete, the central oil control valve of the present invention will be further described in detail below with reference to the accompanying drawings. Here, illustrative embodiments of the present invention and their descriptions are used to explain the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making inventive contributions are within the scope of protection of the present invention.

[0031] It should be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0032] like Figures 1-3As shown, the present invention provides a central oil control valve, which includes a housing 1 and a valve core 2. A valve cavity is provided inside the housing 1. One end of the valve core 2 is slidably mounted in the valve cavity along the axial direction, and the other end of the valve core 2 is exposed outside the valve cavity and connected to an actuator. A first oil outlet 10 and a second oil outlet 11 are provided on the side wall of the housing 1, respectively communicating with a first working chamber and a second working chamber of a phaser. Furthermore, the portion of the valve core 2 located inside the housing 1 has an axially extending mounting hole 3, and a hollow support tube 4 is fitted inside the mounting hole 3. The outer wall of the support tube 4 is connected to... An oil passage 5 is provided between the inner walls of the mounting hole 3. The outer wall of the valve core 2 is provided with a first annular groove 6, a second annular groove 7, a third annular groove 8, and a fourth annular groove 9, which are spaced axially and communicate with the mounting hole 3. Specifically, the first annular groove 6 and the third annular groove 8 are always in communication with the oil passage 5. At the bottom of each of the first and third annular grooves, multiple third through holes 28 communicating with the oil passage 5 are provided, and these through holes 28 are distributed circumferentially along the first and third annular grooves. A one-way valve assembly is provided between the outer wall of the support tube 4 and the inner wall of the mounting hole 3. The one-way valve assembly includes a first one-way valve for controlling the unidirectional flow of the fourth annular groove 9 towards the oil passage 5. The housing 1 is also provided with an oil inlet passage communicating with the fourth annular groove 9. An oil drain hole 12 is provided on the side wall of the support tube 4 to connect the second annular groove 7 with its inner hole. An oil outlet passage 13 is provided on the side wall of the valve core 2 away from the housing 1, communicating with the inner hole of the support tube 4.

[0033] In this embodiment, as Figure 4 As shown, the first one-way valve includes at least one elastic diaphragm, and one end of the elastic diaphragm is connected to the support tube 4. The bottom of the fourth annular groove 9 is provided with a first through hole 15 that communicates with the oil passage 5. The other end of the elastic diaphragm is respectively sealed on the inner wall of the mounting hole 3 at a position corresponding to the first through hole 15 at the bottom of the fourth annular groove 9. That is, in this structure, the elastic diaphragm can only deform towards the oil passage 5 to form a one-way valve for controlling the oil in the fourth annular groove 9 to flow unidirectionally towards the oil passage 5.

[0034] In this structure, the oil circuit is switched when the valve core 2 is in different states through a simple diaphragm-type check valve. Compared with the diaphragm, spring and valve seat structure of the existing technology, the check valve structure is simpler and easier to process and install.

[0035] More specifically, in this embodiment, the elastic diaphragm is preferably a first spring sheet 14, and a limiting groove 16 is formed on the outer wall of the support tube 4. A spring connecting piece 17 is installed in the limiting groove 16, and the first spring sheet 14 is integrally formed on the spring connecting piece 17. This structure adopts a spring-type check valve plus a support tube 4, which significantly reduces the cost of the valve core 2 assembly; it eliminates the need for a complex inlet check valve, thus significantly reducing the overall cost of the control valve. Furthermore, in this structure, the spring check valve and the valve core 2 are integrated into a single unit, making installation more convenient.

[0036] In the above structure, a protruding riveting positioning post 29 is provided at the bottom of the limiting groove 16, and a corresponding positioning hole 30 is preset on the spring connecting member 17. When the spring connecting member 17 is installed into the limiting groove 16, the riveting positioning post 29 is ensured to pass through the positioning hole 30, so that the spring connecting member 17 and the support tube 4 are riveted and fixed after the position is limited.

[0037] In this embodiment, more specifically, a second spring sheet 33 is integrally formed on the spring sheet connector 17, and a first through hole 15 communicating with the oil passage is also opened at the bottom of the second annular groove 7. The second spring sheet 33 is attached to and sealed on the inner wall of the mounting hole 3 at the position corresponding to the first through hole 15 at the bottom of the second annular groove 7, so as to form a second one-way valve for controlling the oil in the second annular groove 7 to flow unidirectionally toward the oil passage 5, so as to realize the internal circulation of the oil in the first working chamber to the second working chamber in the first working state.

[0038] In addition, to ensure stable flow of engine oil between different channels in the control valve, two sets of symmetrical first through holes 15 are provided at the bottom of the second annular groove 7 and the fourth annular groove 9. Two first spring plates 14 and second spring plates 33 corresponding to each set of first through holes 15 are formed at both ends of the spring plate connector 17.

[0039] In the above structure, for ease of description and understanding, the first working chamber is denoted as A, and the second working chamber is denoted as B.

[0040] When valve core 2 is in the first state, i.e., in its initial position, the oil inlet channel, oil channel 5, third annular groove 8, and second oil outlet 11 are sequentially connected. Specifically, in this state, the second annular groove 7 and the third annular groove 8 are aligned with the first oil outlet 10 and the second oil outlet 11, respectively. Oil enters the fourth annular groove 9 through the oil inlet channel. Under the pressure of the oil, the first check valve opens, and oil enters the oil channel 5. Furthermore, in this state, the third annular groove 8 is connected to the second working chamber of the phaser. Therefore, the oil in the oil channel 5 can sequentially pass through the third through hole 28 at the bottom of the third annular groove 8 and the second oil outlet 11 to supply oil to the second working chamber of the phaser. At this time, the third through hole 28 at the bottom of the second annular groove 7 is connected to the first working chamber of the phaser. The oil in the first working chamber can enter the drain hole 12 from the third annular groove 8 and then drain outwards from the oil outlet channel 13. (See appendix) Figure 5 .

[0041] In the above working state, as the operation tends to stabilize, the oil outlet pressure will increase, and the pressure in the first working chamber will also increase accordingly. When the pressure in the first working chamber rises to a level greater than the oil pressure in the oil inlet channel, the second one-way valve will be opened and the first one-way valve will be closed. At this time, the oil in the first working chamber can enter the oil channel 5, and then pass through the third through hole 28 at the bottom of the third annular groove 8 and enter the second working chamber through the second oil outlet 11, forming an internal circulation of oil, which has the effect of saving oil.

[0042] When valve core 2 is in the second state, i.e., when valve core 2 is at its maximum stroke position, the oil inlet channel, oil channel 5, first annular groove 6, and first oil outlet 10 are connected in sequence. Specifically, in this state, the first annular groove 6 and the second annular groove 7 are aligned with the first oil outlet 10 and the second oil outlet 11, respectively. That is, after the oil enters the fourth annular groove 9 from the oil inlet channel, it pushes open the spring plate of the first one-way valve, and the oil enters the oil channel 5. Under the one-way blocking action of the second one-way valve, the oil can only flow towards the first annular groove 6, and then passes through the third through hole 28 at the bottom of the first annular groove 6 to enter the first working chamber. Similarly, the second oil outlet 11, the second annular groove 7, the drain hole 12, and the oil outlet channel 13 are connected in sequence. That is, the oil in the second working chamber can enter the drain hole from the second annular groove 7, and then drain outward from the oil outlet channel 13. See Appendix. Figure 6 .

[0043] When valve core 2 is in the third state, i.e., in the middle stroke position, the oil inlet channel, oil channel 5, first annular groove 6, third annular groove 8, first oil outlet 10, and second oil outlet 11 are connected. At this time, the first annular groove 6 and the third annular groove 8 are aligned with the first oil outlet 10 and the second oil outlet 11, respectively. That is, after the oil enters the fourth annular groove 9 from the oil inlet channel, it pushes open the spring plate of the first one-way valve and enters the oil channel 5. At this time, the second one-way valve is open. Therefore, part of the oil in the oil channel 5 enters the second working chamber from the third through hole 28 at the bottom of the third annular groove 8, and the other part enters the first working chamber from the third through hole 28 at the bottom of the first annular groove 6. That is, oil is supplied to the first and second working chambers of the phaser at the same time, the pressure is balanced, and the phaser stays in the holding position. See Appendix. Figure 7 .

[0044] In the above structure, the new valve core 2, combined with the oil inlet channel on the housing 1 and the on / off state of the two check valves, enables the switching of three states, realizing the function of a traditional oil control valve. Furthermore, the entire control valve structure eliminates the need for the slide valve sleeve structure and the oil inlet check valve structure formed by the diaphragm and spring at the bottom of the valve chamber, making the structure simpler, easier to process, and lower in manufacturing cost. At the same time, the second check valve can also realize internal oil circulation, reducing the external oil supply and saving oil.

[0045] In this embodiment, as Figure 2 As shown, the valve cavity is a blind hole structure with one open end. An elastic reset member 18 is provided between the end of the valve core 2 near the bottom of the blind hole and the bottom wall of the blind hole. The other end of the valve core 2 is limited by a retaining spring 19 to the inner wall of the blind hole opening end, allowing the valve core 2 to reciprocate axially within the valve cavity. More specifically, the housing 1 has several circumferentially distributed oil inlet holes 20 near the bottom wall of the blind hole, which connect to the mounting hole 3. An annular converging groove 31 is recessed on the inner wall of the blind hole near the bottom wall end, allowing multiple oil inlet holes 20 to simultaneously connect to the oil passage 5, forming an oil inlet channel. Preferably, the elastic reset member 18 is a spring, ensuring stable and flexible reciprocating movement of the valve core 2.

[0046] The housing 1 has an oil inlet hole 20, one end of which is externally connected to a filter screen 21 to cover the oil inlet hole 20. After the filter screen 21 is installed, it can effectively filter impurities in the oil and prevent the valve core 2 from being blocked by impurities, thus affecting the flexible switching of oil circuit.

[0047] like Figure 2As shown, a limiting step 22 is provided at one end of the mounting hole 3 near the oil outlet channel 13. One end of the support tube 4 abuts against the limiting step 22, and one end of the elastic reset member 18 abuts against the other end of the support tube 4. The other end of the elastic reset member 18 abuts against the bottom wall of the blind hole, thereby limiting the connection between the support tube 4 and the valve core 2. In addition, in this structure, an oil discharge check valve 23 is provided between the end of the support tube 4 near the oil outlet through hole and the oil outlet channel 13. Specifically, a valve groove is provided on the valve core 2 near the oil outlet channel 13, and a ball is installed in the movable groove. A conical hole that mates with the ball is provided at the end of the support tube 4 near the oil outlet channel 13. The ball can move between the valve groove and the conical hole. The oil in the inner cavity of the support tube 4 can push the ball and flow out from the oil outlet channel 13. After the external oil enters the valve groove, it will push the ball against and seal it in the conical hole, thus preventing it from entering the inner cavity of the support tube 4, thereby forming a structure that can only discharge oil in one direction.

[0048] In addition, an installation boss 24 is integrally formed on the outer wall of the support tube 4, and a limiting groove 16 is recessed on the installation boss 24, thereby ensuring the strength of the connection structure between the spring connector 17 and the support tube 4.

[0049] On the other hand, such as Figure 2 , 4 As shown, in the above structure, a limiting block 25 is formed protruding outward on the outer wall of the support tube 4. The outer end face of the limiting block 25 slides in fit with the inner wall of the mounting hole 3, and the oil drain hole 12 is opened on the limiting block 25. A positioning protrusion 26 is provided on the outer wall of the support tube 4 near the blind hole opening end, and a positioning groove is provided on the inner wall of the mounting hole 3. When the support tube 4 is inserted into the mounting hole 3 axially until the positioning protrusion 26 and the positioning groove are in place, the oil drain hole 12 is aligned with the second through hole 27 at the bottom of the second annular groove 7. In this structure, the positioning protrusion 26 is essentially a foolproof mechanism, ensuring that the support tube 4 can be inserted into the mounting hole 3 at the prepared angle, and realizing the communication between the oil drain hole 12 and the inner cavity of the support tube 4.

[0050] More specifically, in this structure, a protruding elastic support piece 32 is formed on the outer wall of the spring connector 17 away from the mounting boss 24. After the spring connector 17 is riveted and fixed to the outer wall of the support tube 4, the support tube 4 is inserted into the mounting hole 3, and the elastic support piece 32 abuts against the inner wall of the mounting hole 3 to improve stability. Specifically, the elastic support piece 32 is radially inclined from the inside to the outside along the direction away from the oil outlet channel 13, such as... Figure 4 As shown.

[0051] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A central oil control valve, comprising a housing (1) and a valve core (2), wherein one end of the valve core (2) is slidably fitted within the valve cavity of the housing (1), characterized in that: The valve core (2) is located inside the housing (1) and has a mounting hole (3). A hollow support tube (4) is installed inside the mounting hole (3). An oil passage (5) is provided between the outer wall of the support tube (4) and the inner wall of the mounting hole (3). The outer wall of the valve core (2) is provided with a first annular groove (6), a second annular groove (7), a third annular groove (8), and a fourth annular groove (9) that are spaced apart along its axial direction and communicate with the mounting hole (3). The first annular groove (6) and the third annular groove (8) communicate with the oil passage (5). A one-way valve is provided between the outer wall of the support tube (4) and the inner wall of the mounting hole (3). The one-way valve group includes a first one-way valve for controlling the fourth annular groove (9) to unidirectionally flow toward the oil passage (5); the side wall of the housing (1) is provided with a first oil outlet (10) and a second oil outlet (11) respectively communicating with the first working chamber and the second working chamber of the phaser; the housing (1) is also provided with an oil inlet channel communicating with the fourth annular groove (9); the side wall of the support tube (4) is provided with an oil outlet (12) for communicating with the second annular groove (7) and its inner hole; the side wall of the valve core (2) away from the housing (1) is provided with an oil outlet channel (13) communicating with the inner hole of the support tube (4); When the valve core (2) is in the first state, the oil inlet channel, the oil passage (5), the third annular groove (8), and the second oil outlet (11) are connected in sequence, and the first oil outlet (10), the second annular groove (7), the drain hole (12), and the oil outlet channel (13) are connected in sequence; when the valve core (2) is in the second state, the oil inlet channel, the oil passage (5), the first annular groove (6), and the first oil outlet (10) are connected in sequence; the second oil outlet (11), the second annular groove (7), the drain hole (12), and the oil outlet channel (13) are connected in sequence; when the valve core (2) is in the third state, the oil inlet channel, the oil passage (5), the first annular groove (6), the third annular groove (8), the first oil outlet (10), and the second oil outlet (11) are connected.

2. The central oil control valve according to claim 1, characterized in that: The first one-way valve includes an elastic diaphragm. One end of the elastic diaphragm is connected to the support tube (4). The bottom of the fourth annular groove (9) is provided with a first through hole (15) that connects to the oil passage (5). The other end of the elastic diaphragm is attached to and blocked on the inner wall of the mounting hole (3) at the position corresponding to the first through hole (15) at the bottom of the fourth annular groove (9).

3. The central oil control valve according to claim 2, characterized in that: The elastic diaphragm is a first spring sheet (14), and a limiting groove (16) is opened on the outer wall of the support tube (4). A spring connector (17) is installed in the limiting groove (16), and the first spring sheet (14) is integrally formed on the spring connector (17).

4. The central oil control valve according to claim 3, characterized in that: The spring connector (17) is also integrally formed with a second spring sheet (33). The bottom of the second annular groove (7) is provided with a first through hole (15) that connects to the oil passage. The second spring sheet (33) is attached to and sealed on the inner wall of the mounting hole (3) at a position corresponding to the first through hole (15) at the bottom of the second annular groove (7) to form a second one-way valve for controlling the oil in the second annular groove (7) to flow unidirectionally toward the oil passage (5), so as to realize the internal circulation of the oil in the first working chamber to the second working chamber in the first working state.

5. The central oil control valve according to any one of claims 1 to 4, characterized in that: The valve cavity is a blind hole. An elastic reset member (18) is provided between one end of the valve core (2) near the bottom of the blind hole and the bottom wall of the blind hole. The other end of the valve core (2) is limited by a snap ring (19) between it and the inner wall of the opening end of the blind hole.

6. The central oil control valve according to claim 5, characterized in that: The housing (1) has several oil inlet holes (20) distributed circumferentially and connected to the mounting hole (3) at one end near the bottom wall of the blind hole, so as to form the oil inlet channel.

7. The central oil control valve according to claim 6, characterized in that: The outer side of the housing (1) near the oil inlet (20) is connected to a filter screen (21) for covering the oil inlet (20).

8. The central oil control valve according to claim 5, characterized in that: A limiting step (22) is provided at one end of the mounting hole (3) near the oil outlet channel (13). One end of the support tube (4) abuts against the limiting step (22). One end of the elastic reset member (18) abuts against the other end of the support tube (4). The other end of the elastic reset member (18) abuts against the bottom wall of the blind hole. An oil discharge check valve (23) is provided between the end of the support tube (4) near the oil outlet channel (13) and the oil outlet channel (13).

9. The central oil control valve according to claim 3 or 4, characterized in that: The outer wall of the support tube (4) is integrally formed with a mounting boss (24), and the limiting groove (16) is recessed on the mounting boss (24).

10. The central oil control valve according to claim 5, characterized in that: The outer wall of the support tube (4) is also formed with a limiting block (25) protruding outward. The outer end face of the limiting block (25) slides with the inner wall of the mounting hole (3). The oil drain hole (12) is opened on the limiting block (25). The outer wall of the support tube (4) near the opening end of the blind hole is provided with a positioning protrusion (26). The inner wall of the mounting hole (3) is provided with a positioning groove. When the support tube (4) is inserted into the mounting hole (3) axially until the positioning protrusion (26) and the positioning groove are in place, the oil drain hole (12) is aligned with the second through hole (27) at the bottom of the second annular groove (7).

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