An integrated oil control valve and a variable hydraulic valve system including the same

Abstract

This invention discloses an integrated oil control valve and a variable hydraulic valve system including the oil control valve. The main feature is that the on / off times of two or more rotary valves in the integrated oil control valve are independently adjustable, enabling control of the variable opening processes of two or more valves, whether identical or different. It includes a housing, rotary valves, and a timing transmission mechanism. The housing is provided with a rotary valve mounting hole, a first oil inlet channel, a second oil inlet channel, an oil outlet channel, a first control groove, and a second control groove. The rotary valve includes a rotary valve core, a first rotary valve sleeve, and a second rotary valve sleeve. This integrated oil control valve is used in conjunction with the valve drive oil circuit of the variable hydraulic valve system. By independently adjusting the rotation angles of the first and second rotary valve sleeves, together with the rotary valve core, multiple oil circuit on / off switching valves with adjustable opening times are formed, effectively expanding the working range of the valve train and playing an important role in realizing various internal combustion engine operating modes.

Description

Technical Field

[0001] This invention relates to the field of valve mechanisms for internal combustion engines, and in particular to an integrated oil control valve for a variable hydraulic valve system for internal combustion engines and a variable hydraulic valve system including the oil control valve. Background Technology

[0002] In recent years, with the continuous development of internal combustion engine technology, the traditional single, fixed valve opening method has become increasingly unable to meet performance requirements. Therefore, in order to achieve ideal valve timing under different operating conditions, variable valve technology has developed rapidly and been widely applied. Currently, variable valve technology has gradually evolved from single-parameter variable to multi-parameter variable, resulting in fully variable valve drive systems that integrate variable opening lift, opening phase, opening duration, and opening frequency. Among these, BMW's Valvetronic system, Hyundai's CVVD system, and Fiat's Multiair system are the most representative. However, at the same time, these systems have some shortcomings in terms of component reliability, operating economy, and frequency responsiveness, and can only meet the variable opening of valves of the same name, and cannot achieve the variable opening function of two or more valves.

[0003] Chinese invention patent ZL201310296611.0 discloses an oil control device for a fully variable hydraulic valve system in an internal combustion engine. It proposes an oil control device that can replace high-frequency solenoid valves in single-cylinder and multi-cylinder internal combustion engines. This device is connected to the hydraulically driven valve system and its main structure includes a housing and a rotary valve, a hydraulic accumulator, and a transmission mechanism installed within the housing. This device acts as an adjustable opening time switching valve between the hydraulic drive unit and the low-pressure system, but it can only control the synchronous variable opening of valves of the same name (intake or exhaust valves). To achieve the variable opening functions of two or more valves with different names, two or more independent oil control devices must be set up, which greatly increases the structural complexity of the variable hydraulic valve system, thus reducing the overall system compactness. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, such as high structural complexity and poor compactness, this invention provides an integrated oil control valve and a variable hydraulic valve system including the oil control valve. The main feature is that by changing the contact time of the radial oil holes of two or more sets of rotary valves in the integrated oil control valve, the variable opening process of two or more valves, whether identical or different, can be controlled. When used in conjunction with the variable hydraulic valve system, this integrated oil control valve can greatly expand the working range of the internal combustion engine's valve train and plays an important role in assisting in the realization of various internal combustion engine operating modes.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention proposes an integrated oil control valve for a variable hydraulic valve system, comprising: a housing, a rotary valve, and a timing transmission mechanism;

[0007] The housing includes a rotary valve mounting hole, a first oil inlet channel, a second oil inlet channel, and an oil outlet channel;

[0008] The rotary valve includes a rotary valve core, a first rotary valve sleeve, and a second rotary valve sleeve; the rotary valve core and the first rotary valve sleeve constitute a first rotary valve switch, and the rotary valve core and the second rotary valve sleeve constitute a second rotary valve switch; one end of the rotary valve core is a transmission end, driven to rotate by a timing transmission mechanism; the rotary valve core is provided with a first radial oil hole, a second radial oil hole, and a central oil hole; the first radial oil hole communicates with the central oil hole, and the second radial oil hole communicates with the central oil hole; the rotary valve core is installed inside the first rotary valve sleeve and the second rotary valve sleeve, which are installed inside the rotary valve mounting hole in the housing; the first rotary valve sleeve has a radial oil hole at the axial position corresponding to the first radial oil hole of the rotary valve core, communicating with a first oil inlet channel, and the second rotary valve sleeve has a radial oil hole at the axial position corresponding to the second radial oil hole of the rotary valve core, communicating with a second oil inlet channel; the radial oil holes of the first and second rotary valve sleeves can achieve connection of their respective radial oil holes during the rotation of the rotary valve core.

[0009] The integrated oil control valve of the present invention can form two or more independent rotary valve switches by assembling two or more rotary valve sleeves on a rotary valve core. By connecting with two or more valve drive oil circuits in the hydraulic valve mechanism, the valve drive oil circuit and the low-pressure system can be turned on and off at a set time. By adjusting the rotary valve sleeve in each rotary valve switch to rotate clockwise or counterclockwise by a certain angle, the turn-on time of the rotary valve switch can be delayed or advanced. By cooperating with the valve cam, the control of the variable opening process of two or more valves, whether the same or different, can be completed.

[0010] Furthermore, the radial oil holes of the first rotary valve sleeve and the radial oil holes of the second rotary valve sleeve are evenly distributed in groups on their respective circumferential positions, with the number of groups being N, where N is a positive integer; or the first radial oil holes and the second radial oil holes of the rotary valve core are evenly distributed in groups on their respective circumferential positions, with the number of groups being N, where N is a positive integer.

[0011] Furthermore, the housing and / or the first rotary valve sleeve are provided with a first annular groove at the axial position corresponding to the first radial oil hole of the rotary valve core, and the housing and / or the second rotary valve sleeve are provided with a second annular groove at the axial position corresponding to the second radial oil hole of the rotary valve core.

[0012] Furthermore, the first oil inlet channel of the housing is connected to the first annular groove, and the second oil inlet channel of the housing is connected to the second annular groove.

[0013] Furthermore, the central oil hole, the first radial oil hole, the second radial oil hole of the rotary valve core and the rotary valve mounting hole of the housing constitute a low-pressure oil chamber, and the oil outlet channel of the housing is connected to the low-pressure oil chamber.

[0014] Furthermore, the first and second rotary valve sleeves are respectively provided with control gear teeth, the housing is provided with a first control groove at the position of the control gear teeth of the first rotary valve sleeve, and the housing is provided with a second control groove at the position of the control gear teeth of the second rotary valve sleeve.

[0015] Furthermore, the integrated oil control valve also includes a limiting device, which, together with the housing, restricts the relative movement of the radial oil holes of the first rotary valve switch and the second rotary valve switch along the axial direction.

[0016] Furthermore, the timing transmission mechanism includes a transmission wheel and a transmission shaft. The transmission wheel is driven by a camshaft, and the speed ratio between the transmission wheel and the camshaft is 1:N, where N is a positive integer. The transmission wheel is fixedly connected to the transmission shaft, and the transmission shaft is connected to the transmission end of the rotary valve core, thereby driving the rotary valve core to rotate.

[0017] Furthermore, the timing transmission mechanism also includes a cross-slider coupling, wherein the transmission end of the rotary valve core and the end of the transmission shaft are respectively provided with connecting teeth that connect to the cross-slider coupling.

[0018] Secondly, the present invention proposes a variable hydraulic valve system, including the integrated oil control valve described above; the oil inlet channel is connected to the valve drive oil circuit, the oil outlet channel is connected to the low-pressure system, and the transmission wheel of the timing transmission mechanism is driven by the valve camshaft.

[0019] The working process of this invention will be described below using an integrated oil control valve that integrates two sets of independently adjustable rotary valve switches as an example:

[0020] The first oil inlet channel on the integrated oil control valve housing is connected to the first valve drive oil circuit of the variable hydraulic valve system, and the second oil inlet channel is connected to the second valve drive oil circuit of the variable hydraulic valve system. The two independently adjustable rotary valve switches are composed of the same valve core and two rotary valve sleeves. The first rotary valve sleeve and the rotary valve core constitute the first rotary valve switch, and the second rotary valve sleeve and the rotary valve core constitute the second rotary valve switch. The three components are installed together in the rotary valve mounting hole. The first and second rotary valve sleeves are also provided with radial oil holes at the axial positions that cooperate with the radial oil holes of the rotary valve core. As the rotary valve core rotates continuously, the radial oil holes at the same axial positions are periodically connected and disconnected during the rotation cycle.

[0021] When the valve timing cam of the variable hydraulic valve system rotates to the working section, the hydraulic oil pressure in the valve drive oil circuit increases. The high-pressure hydraulic oil flows into the integrated oil control valve through the oil inlet channel. If the radial oil holes of the rotary valve sleeve and the rotary valve core are not connected at this time, no oil leakage will occur, and the valve will move according to the designed cam profile.

[0022] When the first valve drive oil circuit is variableally controlled, the first rotary valve switch connected to it comes into play. At this time, the radial oil holes of the first rotary valve sleeve and the rotary valve core are connected. Hydraulic oil flows into the low-pressure oil chamber composed of the first radial oil hole of the rotary valve core, the central oil hole of the rotary valve core, and the housing through the first oil inlet channel and the radial oil hole of the first rotary valve sleeve. Then, it flows out of the integrated control valve through the oil outlet channel connected to the low-pressure oil chamber and finally enters the low-pressure system of the variable hydraulic valve system. Due to the oil discharge operation, the pressure in the valve drive oil circuit decreases or increases at a slower rate. Therefore, the valve no longer moves according to the designed cam profile, realizing variable opening. By adjusting the rotation angle of the first rotary valve sleeve clockwise or counterclockwise, the opening time of the radial oil hole of the first rotary valve switch can be delayed or advanced, thereby changing the oil discharge time of the hydraulic oil in the valve drive oil circuit and producing more variable opening patterns for the valve. Similarly, when the second valve drive oil circuit is variablely controlled, the second rotary valve switch connected to it comes into play. By adjusting the rotation angle of the second rotary valve sleeve clockwise or counterclockwise, the second valve drive oil circuit produces a variable valve opening pattern corresponding to the valve.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) Two or more independently adjustable rotary valve switches are integrated in one oil control valve. The structure is simple and compact, which can reduce the space occupied by the variable hydraulic valve system and reduce the overall height of the machine.

[0025] (2) By matching the variable hydraulic valve system, the timing of the on / off of the two or more valve drive oil circuits can be flexibly adjusted at the same time, realizing the same or different variable opening process of two or more valves, expanding the working range of the valve train and applicable to various internal combustion engine working modes.

[0026] (3) It can be used with single-cylinder and multi-cylinder internal combustion engine variable hydraulic valve systems. It has strong versatility and expandability, and is easy to realize the integrated and modular structural design of hydraulic variable valve timing mechanism. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0028] Figure 1 This is a schematic cross-sectional view of the integrated oil control valve structure that integrates two sets of rotary valve switches in Example 1.

[0029] Figure 2 for Figure 1 AA cross-section view.

[0030] Figure 3 for Figure 1 BB cross-section.

[0031] Figure 4 for Figure 1 CC cross-section view.

[0032] Figure 5 This is a schematic diagram of the integrated oil control valve matched with the variable hydraulic valve system in Example 2.

[0033] Figure label:

[0034] 1. Housing; 1-1. Rotary valve mounting hole; 1-2. First oil inlet channel; 1-3. Second oil inlet channel; 1-4. Oil outlet channel; 1-5. First control groove; 1-6. Second control groove; 2. Rotary valve core; 2-1. First radial oil hole; 2-2. Second radial oil hole; 2-3. Central oil hole; 3. First rotary valve sleeve; 3-1. First valve sleeve radial oil hole; 3-2. First control gear tooth; 4. Second rotary valve sleeve; 4-1. Second valve sleeve radial oil hole; 4-2. Second control gear tooth; 5-1. Transmission wheel; 5-2. Transmission shaft; 5-3. Cross slider coupling; 6. Limiting device; 7. Low-pressure oil chamber; H-1. First annular groove; H-2. Second annular groove; K1. First rotary valve switch; K2. Second rotary valve switch;

[0035] S, valve train camshaft; M-1, intake camshaft; M-2, intake hydraulic tappet; M-3, intake valve drive circuit; M-4, intake hydraulic piston; M-5, intake valve spring; M-6, intake valve; N-1, exhaust camshaft; N-2, exhaust hydraulic tappet; N-3, exhaust valve drive circuit; N-4, exhaust hydraulic piston; N-5, exhaust valve spring; N-6, exhaust valve; D-1, low-pressure system; D-2, hydraulic check valve. Detailed Implementation

[0036] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Example 1:

[0039] like Figure 1 As shown, this embodiment provides an integrated oil control valve that integrates two sets of rotary valve switches and can be independently controlled and adjusted, including a housing 1, a rotary valve, a timing transmission mechanism, and a limiting device 6;

[0040] The housing 1 includes a rotary valve mounting hole 1-1, a first oil inlet channel 1-2, a second oil inlet channel 1-3, an oil outlet channel 1-4, a first control groove 1-5, and a second control groove 1-6.

[0041] The rotary valve includes a rotary valve core 2, a first rotary valve sleeve 3, and a second rotary valve sleeve 4; the rotary valve core 2 and the first rotary valve sleeve 3 constitute a first rotary valve switch K1, and the rotary valve core 2 and the second rotary valve sleeve 4 constitute a second rotary valve switch K2.

[0042] The rotary valve core 2 is provided with a first radial oil hole 2-1, a second radial oil hole 2-2 and a central oil hole 2-3 that are interconnected. Together with the rotary valve mounting hole 1-1 and the limiting device 6, it forms a low-pressure oil chamber 7, which is connected to the oil outlet channel 1-4.

[0043] The aforementioned rotary valve core 2 is installed inside the first rotary valve sleeve 3 and the second rotary valve sleeve 4. The first rotary valve sleeve 3 and the second rotary valve sleeve 4 are installed inside the rotary valve mounting hole 1-1, and there is a certain distance between the first rotary valve sleeve 3 and the second rotary valve sleeve 4. The limiting device 6 and the housing 1 together restrict the first rotary valve sleeve 3 from axial displacement. The housing 1 and the rotary valve core 2 together restrict the second rotary valve sleeve 4 from axial displacement.

[0044] The first rotary valve sleeve 3 is provided with a first radial oil hole 3-1 at the axial position corresponding to the first radial oil hole 2-1 of the rotary valve core 2, and the second rotary valve sleeve 4 is provided with a second radial oil hole 4-1 at the axial position corresponding to the second radial oil hole 2-2 of the rotary valve core 2; the first radial oil hole 3-1 is connected and disconnected from the first radial oil hole 2-1 during the rotation of the rotary valve core 2, and the second radial oil hole 4-1 is connected and disconnected from the second radial oil hole 2-2 during the rotation of the rotary valve core 2.

[0045] The timing transmission mechanism includes a drive wheel 5-1, a drive shaft 5-2, and a cross-slider coupling 5-3. The drive wheel 5-1 is driven by the valve camshaft, and its power is transmitted sequentially through the drive shaft 5-2 (fixed to the drive wheel 5-1), the cross-slider coupling 5-3 (used to compensate for coaxiality errors), and finally to the connecting teeth at the transmission end of the rotary valve core 2. This drives the rotary valve core 2 to rotate continuously and synchronously with the valve camshaft according to a certain transmission ratio. Figure 4 The diagram shows the connection relationship between the drive shaft 5-2, the cross-slider coupling 5-3, and the rotary valve core 2.

[0046] A first annular groove H-1 is provided between the aforementioned housing 1 and the first rotary valve sleeve 3, the first annular groove H-1 connecting the first oil inlet channel 1-2 and the first valve sleeve radial oil hole 3-1; a second annular groove H-2 is provided between the aforementioned housing 1 and the second rotary valve sleeve 4, the second annular groove H-2 connecting the second oil inlet channel and the second valve sleeve radial oil hole 4-1.

[0047] Furthermore, the aforementioned annular groove can be provided on the housing 1 or the rotary valve sleeve, or simultaneously on both the housing 1 and the rotary valve sleeve. The annular groove connects the oil inlet channel with the radial oil hole of the rotary valve sleeve, ensuring that during the adjustment of the rotary valve sleeve, the annular groove can smoothly discharge the hydraulic oil in the valve drive oil circuit into the low-pressure oil chamber. Depending on the rotation angle range of the rotary valve sleeve, the annular groove can also be a semi-annular groove covering the rotation angle range of the radial oil hole of the rotary valve sleeve.

[0048] Furthermore, the rotation adjustment of the rotary valve sleeve is achieved through control gears provided on the rotary valve sleeve. The opening of the control groove on the integrated oil control valve housing is determined based on the installation position of the control gears. The external control mechanism engages with the control gears of the rotary valve sleeve through this control groove to control the rotary valve sleeve for angle adjustment and angle fixation. Specifically, in this embodiment, the first rotary valve sleeve 3 is provided with a first control gear 3-2, which rotates by a certain control angle only under the action of the external control mechanism through the opening of the first control groove 1-5 on the housing 1, and remains stationary in the non-control phase. The second rotary valve sleeve 4 is provided with a second control gear 4-2, which rotates by a certain control angle only under the action of the external control mechanism through the opening of the second control groove 1-6 on the housing 1, and remains stationary in the non-control phase.

[0049] Furthermore, to meet the requirements for the on / off frequency of the rotary valve at high engine speeds, and to ensure sufficient radial oil hole engagement time for the rotary valve switch during one working cycle of the internal combustion engine, the speed ratio of the transmission wheel 5-1 to the camshaft is set to 1:N, where N is a positive integer. Based on the set speed ratio and engagement time, N sets of radial oil holes are evenly distributed on the circumference of the first rotary valve sleeve 3 and the second rotary valve sleeve 4, respectively, or N sets of radial oil holes are evenly distributed on the circumference of the rotary valve core 2. In this embodiment, the speed ratio N between the camshaft and the transmission wheel 5-1 is 1. The number of radial oil holes in the first radial oil hole 2-1 and the second radial oil hole 2-2 in the rotary valve core 2 is N = 1, which corresponds to the number of radial oil holes in the first valve sleeve radial oil hole 3-1 and the second valve sleeve radial oil hole 4-1 being N = 1 set; or the number of radial oil holes in the first valve sleeve radial oil hole 3-1 and the second valve sleeve radial oil hole 4-1 is N = 1, which corresponds to the number of radial oil holes in the first radial oil hole 2-1 and the second radial oil hole 2-2 in the rotary valve core 2 being N = 1 set.

[0050] like Figure 2 As shown, the first rotary valve switch K1 is in the ON state. At this time, the hydraulic oil in the first oil inlet channel 1-2 and the first annular groove H-1 can enter the central oil hole 2-3 through the first valve sleeve radial oil hole 3-1 and the first radial oil hole 2-1, and then enter the low-pressure oil chamber 7 and the oil outlet channel 1-4 to flow out of the integrated oil control valve, completing the oil discharge action; as shown Figure 3 As shown, the second rotary valve switch K2 is in the open state. At this time, the hydraulic oil in the second oil inlet channel 1-3 and the second annular groove H-2 cannot enter the central oil hole 2-3 through the radial oil holes 4-1 and 2-2 of the second valve sleeve, and no oil leakage occurs. By controlling the first rotary valve sleeve 3 in the first rotary valve switch K1 and the second rotary valve sleeve 4 in the second rotary valve switch K2 to rotate clockwise or counterclockwise by a certain angle, the on / off time of the rotary valve switch can be changed. If the rotation direction is the same as the rotation direction of the rotary valve core 2, the on / off time is delayed; otherwise, the on / off time is advanced.

[0051] Furthermore, the circumferential position of the rotary valve core 2 and the rotary valve sleeve determines the opening and closing time of the radial oil orifice, which is determined by the external control mechanism. The axial position of the rotary valve core 2 and the rotary valve sleeve determines the instantaneous flow area during the opening of the radial oil orifice. Therefore, to ensure the stable and reliable function of the integrated oil control valve during continuous operation, a limiting device 6 is needed to limit the axial displacement of the radial oil orifice when the rotary valve is opening and closing. In this embodiment, the limiting device 6 is a cover structure, located at the end of the housing 1, and connected to the housing 1 by screws.

[0052] Example 2

[0053] like Figure 5As shown, this embodiment provides a variable hydraulic intake and exhaust valve system for an internal combustion engine that matches the integrated oil control valve in Embodiment 1. The system includes an integrated oil control valve, a valve train camshaft S, an intake valve drive chain, an exhaust valve drive chain, a low-pressure system D-1, and a hydraulic check valve D-2.

[0054] The intake valve drive chain includes intake cam M-1, intake hydraulic tappet M-2, intake valve drive oil circuit M-3, intake hydraulic piston M-4, intake valve spring M-5, and intake valve M-6; the exhaust valve drive chain includes exhaust cam N-1, exhaust hydraulic tappet N-2, exhaust valve drive oil circuit N-3, exhaust hydraulic piston N-4, exhaust valve spring N-5, and exhaust valve N-6.

[0055] The valve camshaft S drives the transmission wheel 5-1 in the integrated oil control valve to rotate, thereby causing the rotary valve core 2 to rotate continuously and synchronously with the valve camshaft S according to a fixed transmission ratio.

[0056] The intake valve drive oil circuit M-3 is connected to the first rotary valve switch K1 through the first oil inlet channel 1-2, and the exhaust valve drive oil circuit N-3 is connected to the second rotary valve switch K2 through the second oil inlet channel 1-3. The first rotary valve switch K1 and the second rotary valve switch K2 are connected to the low-pressure system D-1 through the oil outlet channel 1-4.

[0057] The intake valve drive oil circuit M-3 is connected to the low-pressure system D-1 through the hydraulic check valve D-2, and the exhaust valve drive oil circuit N-3 is connected to the low-pressure system D-1 through the hydraulic check valve D-2. When the hydraulic pressure of the intake valve drive oil circuit M-3 or the exhaust valve drive oil circuit N-3 is lower than that of the low-pressure system D-1 after oil leakage, the hydraulic oil can be replenished from the low-pressure system D-1 to the valve drive oil circuit through the hydraulic check valve D-2.

[0058] When the working section of the intake cam M-1 drives the intake hydraulic tappet M-2 to move, the hydraulic oil pressure in the intake valve drive oil circuit M-3 increases. If the radial oil hole in the first rotary valve switch K1 is not open at this time, the high-pressure hydraulic oil will drive the intake hydraulic piston M-4 to overcome the force of the intake valve spring M-5, causing the intake valve M-6 to open according to the designed intake cam M-1 profile. If the radial oil hole in the first rotary valve switch K1 is open at this time, the high-pressure hydraulic oil will sequentially pass through the first oil inlet channel 1-2, the first rotary valve switch K-1, and the outlet... Oil passage 1-4 leaks into low-pressure system D-1. Due to the oil leakage, the hydraulic oil pressure in intake valve drive oil circuit M-3 will decrease or increase at a slower rate. Under the action of intake valve spring M-5, intake valve M-6 may fall back, not open, or not move according to the designed intake cam M-1 profile. Adjusting the first rotary valve sleeve 3 can change the closing time of the radial oil hole of the first rotary valve switch K1. The working section of intake cam M-1 and the different closing times of the radial oil hole of the first rotary valve switch K1 can form a variable intake valve M-6 opening motion pattern.

[0059] When the working section of the exhaust cam N-1 drives the exhaust hydraulic tappet N-2 to move, the hydraulic oil pressure in the exhaust valve drive oil circuit N-3 increases. If the radial oil hole in the second rotary valve switch K2 is not open at this time, the high-pressure hydraulic oil will drive the exhaust hydraulic piston N-4 to overcome the force of the exhaust valve spring N-5, causing the exhaust valve N-6 to open according to the designed exhaust cam N-1 profile. If the radial oil hole in the second rotary valve switch K2 is open at this time, the high-pressure hydraulic oil will pass through the second inlet channel 1-3, the second rotary valve switch K-2, and the outlet channel in sequence. Oil passage 1-4 leaks into low-pressure system D-1. Due to the oil leakage, the hydraulic oil pressure in exhaust valve drive oil circuit N-3 will decrease or increase at a slower rate. Exhaust valve N-6 will fall back or not open or move according to the designed exhaust cam N-1 profile under the action of exhaust valve spring N-5. Adjusting the second rotary valve sleeve 4 can change the closing time of the radial oil hole of the second rotary valve switch K2. The working section of exhaust cam N-1 and the different closing times of the radial oil hole of the second rotary valve switch K2 can form a variable exhaust valve N-6 opening movement pattern.

[0060] The integrated oil control valve in this embodiment integrates two sets of independently adjustable rotary valve switches. It has a simple and compact structure, which can reduce the space occupied by the hydraulic variable valve system and reduce the overall height of the machine. In addition, the integrated oil control valves of two adjacent cylinders can share a set of timing transmission mechanisms, which can not only improve the consistency of valve working state between the two cylinders, but also further reduce the number of parts and reduce the cost of use, which is conducive to improving the versatility and scalability of the integrated oil control valve.

[0061] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical spirit of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An integrated oil control valve characterized by, include: Housing, rotary valve, and timing drive mechanism; The housing includes a rotary valve mounting hole, a first oil inlet channel, a second oil inlet channel, and an oil outlet channel; The rotary valve includes a rotary valve core, a first rotary valve sleeve, and a second rotary valve sleeve; the rotary valve core and the first rotary valve sleeve constitute a first rotary valve switch, and the rotary valve core and the second rotary valve sleeve constitute a second rotary valve switch; one end of the rotary valve core is a transmission end, driven to rotate by a timing transmission mechanism; the rotary valve core is provided with a first radial oil hole, a second radial oil hole, and a central oil hole; the first radial oil hole communicates with the central oil hole, and the second radial oil hole communicates with the central oil hole; the rotary valve core is installed inside the first rotary valve sleeve and the second rotary valve sleeve, which are installed inside the rotary valve mounting hole in the housing; the first rotary valve sleeve has a radial oil hole at the axial position corresponding to the first radial oil hole of the rotary valve core, communicating with a first oil inlet channel, and the second rotary valve sleeve has a radial oil hole at the axial position corresponding to the second radial oil hole of the rotary valve core, communicating with a second oil inlet channel; the radial oil holes of the first and second rotary valve sleeves can achieve connection of their respective radial oil holes during the rotation of the rotary valve core.

2. The integrated oil control valve according to claim 1, characterized in that, The radial oil holes of the first rotary valve sleeve and the radial oil holes of the second rotary valve sleeve are evenly distributed in groups on their respective circumferential positions, with the number of groups being N, where N is a positive integer; or the first radial oil holes and the second radial oil holes of the rotary valve core are evenly distributed in groups on their respective circumferential positions, with the number of groups being N, where N is a positive integer.

3. The integrated oil control valve according to claim 1, characterized in that, The housing and / or the first rotary valve sleeve are provided with a first annular groove at the axial position corresponding to the first radial oil hole of the rotary valve core, and the housing and / or the second rotary valve sleeve are provided with a second annular groove at the axial position corresponding to the second radial oil hole of the rotary valve core.

4. An integrated oil control valve according to claim 1 or 3, characterized in that, The first oil inlet channel of the housing is connected to the first annular groove, and the second oil inlet channel of the housing is connected to the second annular groove.

5. An integrated oil control valve according to claim 1, characterized in that, The central oil hole, the first radial oil hole, the second radial oil hole of the rotary valve core, and the rotary valve mounting hole of the housing constitute a low-pressure oil chamber, and the oil outlet channel of the housing is connected to the low-pressure oil chamber.

6. An integrated oil control valve according to claim 1, characterized in that, The first and second rotary valve sleeves are respectively provided with control gear teeth. The housing is provided with a first control groove at the position of the control gear teeth of the first rotary valve sleeve and a second control groove at the position of the control gear teeth of the second rotary valve sleeve.

7. An integrated oil control valve according to claim 1, characterized in that, The integrated oil control valve also includes a limiting device, which, together with the housing, restricts the relative movement of the radial oil holes of the first rotary valve switch and the second rotary valve switch along the axial direction.

8. An integrated oil control valve according to claim 1, characterized in that, The timing transmission mechanism includes a transmission wheel and a transmission shaft. The transmission wheel is driven by a camshaft, and the speed ratio of the transmission wheel to the camshaft is 1:N, where N is a positive integer. The transmission wheel is fixedly connected to the transmission shaft, and the transmission shaft is connected to the transmission end of the rotary valve core, thereby driving the rotary valve core to rotate.

9. An integrated oil control valve according to claim 8, characterized in that, The timing transmission mechanism also includes a cross-slider coupling, and the transmission end of the rotary valve core and the end of the transmission shaft are respectively provided with connecting teeth to connect with the cross-slider coupling.

10. A variable hydraulic valve system, characterized in that, Includes the integrated oil control valve as described in any one of claims 8-9; the oil inlet channel is connected to the valve drive oil circuit, the oil outlet channel is connected to the low-pressure system, and the transmission wheel of the timing transmission mechanism is driven by the valve camshaft.

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