Camshaft phasing device and engine timing system

Abstract

The present invention provides a camshaft phasing device and an engine timing system. In this camshaft phasing device, the rotor of the camshaft phaser is formed with an oil inlet passage that communicates with an oil supply passage formed in the camshaft. The central oil control valve, which does not require an oil separator sleeve, consists of a housing and a piston. The housing is formed with oil holes that communicate with the oil inlet passage and the first and second oil chambers of the camshaft phaser, respectively. Thus, the reciprocating motion of the piston relative to the housing enables the oil inlet passage to selectively communicate with the first and second oil chambers, thereby achieving an oil separation function with a simple structure while omitting the oil separator sleeve. Furthermore, the camshaft phasing device according to the present invention includes a one-way valve assembly in the oil passage from the oil supply passage to the interior space of the housing of the central oil control valve. This allows oil to flow only one-way from the oil supply passage into the interior space of the housing, preventing reverse flow of hydraulic oil that could cause malfunction of the camshaft phasing device.

Description

Technical Field

[0001] The invention relates to a camshaft phase adjustment device and an engine timing system comprising the camshaft phase adjustment device. Background Art

[0002] The camshaft phaser is one of the most important components of an engine's valve timing system. Generally, a central oil control valve in a camshaft phaser with hydraulic phasing functionality consists of a housing, an oil-distributing sleeve, and a piston within the sleeve. Hydraulic oil flows through the sleeve and housing into the space between the sleeve and the piston. The piston's axial reciprocating motion then directs the hydraulic oil within this space into different oil chambers within the camshaft phaser, achieving oil distribution and enabling the camshaft phaser to achieve various phasing functions.

[0003] In some cases, technicians have proposed solutions that omit the oil-separating sleeve to achieve the oil-separating function. For example, U.S. Patent No. US6523513B2, entitled "Camshaft Timing Device for Internal Combustion Engine," proposes a solution that does so without the oil-separating sleeve. However, this solution has the disadvantages of excessive mechanical complexity and high cost. Summary of the Invention

[0004] The present invention is designed to overcome or at least alleviate the drawbacks of the aforementioned technology that achieves oil separation by omitting the oil-separating sleeve. One objective of the present invention is to provide a novel camshaft phasing device that can achieve oil separation with a relatively simple structure while omitting the oil-separating sleeve. Another objective of the present invention is to provide an engine timing system that includes the aforementioned camshaft phasing device.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions.

[0006] The present invention provides a camshaft phasing device comprising a camshaft phaser and a central oil control valve located within the camshaft phaser. The camshaft phaser comprises a stator and a rotor. The rotor is disposed radially inwardly of the stator and is rotatable relative to the stator. A plurality of groups of oil chambers distributed circumferentially are formed between the stator and the rotor. Each group of oil chambers comprises a first oil chamber and a second oil chamber separated from each other. The central oil control valve is configured to be coaxially mounted radially inwardly of the rotor.

[0007] The rotor is formed with a first oil guide passage that is always connected to the first oil chamber, a second oil guide passage that is always connected to the second oil chamber, and an oil supply passage that is always connected to the oil supply passage formed on the camshaft of the engine.

[0008] The central oil control valve includes a housing fixed to the rotor and a piston located in the housing and capable of reciprocating relative to the housing. The housing is formed with a first oil guide hole that is always connected to the first oil guide passage, a second oil guide hole that is always connected to the second oil guide passage, and an oil inlet hole that is always connected to the oil inlet passage. The reciprocating movement of the piston enables the oil inlet hole to selectively communicate with the first oil guide hole and the second oil guide hole through a space inside the housing.

[0009] The camshaft phasing device also includes a one-way valve assembly, which is arranged in the housing of the rotor or the central oil control valve to allow hydraulic oil to flow from the oil supply passage through the oil inlet passage and the oil inlet hole in a one-way manner into the space inside the housing.

[0010] Preferably, the oil inlet passage comprises:

[0011] an axial portion of the oil inlet passage extending in the axial direction from an end surface of the rotor opposite to the camshaft; and

[0012] The radial portion of the oil inlet passage is connected to the axial portion of the oil inlet passage and extends in the radial direction of the camshaft phaser to a surface of the rotor opposite to the housing.

[0013] More preferably, the one-way valve assembly is provided in the oil inlet passage to allow the oil inlet passage to be unidirectional.

[0014] More preferably, the one-way valve assembly has an annular structure and comprises a one-way valve plate, a one-way valve stopper and a filter disc arranged in the axial direction, and

[0015] The one-way valve plate is formed with a one-way valve disc aligned with the oil inlet passage and the one-way valve disc can only be opened under the action of the hydraulic oil in the oil supply passage. The one-way valve stop portion is formed with a one-way oil hole aligned with the one-way valve disc, and the filter disc at least covers the one-way oil hole.

[0016] More preferably, the rotor is formed with a positioning protrusion, and the one-way valve plate and the one-way valve stop portion are respectively formed with positioning holes that cooperate with the positioning protrusion, so that the one-way valve plate and the one-way oil hole can be aligned with the oil inlet passage through the cooperation of the positioning protrusion and the positioning hole.

[0017] More preferably, the one-way valve assembly is provided at the oil inlet hole to allow the oil inlet hole to be unidirectional.

[0018] More preferably, the one-way valve assembly includes a one-way valve formed by a spiral plate and a filter screen, and the one-way valve can only be opened under the action of the hydraulic oil in the oil inlet passage.

[0019] The present invention also provides a timing system for an engine as follows, which includes a camshaft phasing device and a camshaft as described in any one of the above technical solutions, and the rotor of the camshaft phaser and the housing of the central oil control valve are relatively fixed to the camshaft.

[0020] Preferably, the camshaft is formed with a plurality of oil supply passages respectively communicating with the oil inlet passages of the rotor of the camshaft phaser.

[0021] More preferably, the camshaft is formed with an oil supply passage communicating with an oil inlet passage of a rotor of the camshaft phaser, and the oil supply passage includes an annular oil chamber communicating with all the oil inlet passages.

[0022] By adopting the above-described technical solution, the present invention provides a novel camshaft phasing device and an engine timing system including the camshaft phasing device. The rotor of the camshaft phaser of the camshaft phasing device is formed with an oil inlet passage connected to an oil supply passage formed in the camshaft. The central oil control valve of the camshaft phasing device does not require an oil separator sleeve and instead consists of a housing and a piston capable of reciprocating within the housing. The housing is formed with an oil inlet hole connected to the oil inlet passage, a first oil guide hole connected to a first oil chamber of the camshaft phaser, and a second oil guide hole connected to a second oil chamber of the camshaft phaser. Thus, the reciprocating motion of the piston relative to the housing along the axial direction of the camshaft phaser enables the oil inlet passage to selectively connect with the first and second oil chambers, thereby achieving an oil separation function. Thus, the camshaft phasing device according to the present invention achieves the oil separation function with a simpler structure while omitting the oil separator sleeve of the prior art, thereby reducing costs.

[0023] In addition, in the camshaft phasing device according to the present invention, a one-way valve assembly is also provided in the oil circuit from the oil supply passage to the internal space of the housing of the central oil control valve, so that the hydraulic oil can only flow from the oil supply passage in one direction into the internal space of the housing of the central oil control valve, thereby preventing the hydraulic oil from flowing in reverse and causing a malfunction of the camshaft phasing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1a is a schematic cross-sectional view showing a partial structure of an engine timing system according to a first embodiment of the present invention; Figure 1b It shows Figure 1a A schematic cross-sectional view of a one-way valve assembly of a camshaft phaser of an engine timing system; Figure 1c It shows Figure 1b A schematic diagram of the structure of a one-way valve plate of a one-way valve assembly; Figure 1d It shows Figure 1b A schematic diagram of the structure of a one-way valve stopper of a one-way valve assembly; Figure 1eIt shows Figure 1b Schematic diagram of the filter plate structure of the one-way valve assembly.

[0025] Figure 2 1 is a schematic cross-sectional view showing a partial structure of an engine timing system according to a second embodiment of the present invention.

[0026] Figure 3 1 is a schematic cross-sectional view showing a partial structure of an engine timing system according to a third embodiment of the present invention.

[0027] Description of Reference Numerals

[0028] 1 Camshaft phaser 11 Rotor A First oil guide passage B Second oil guide passage C Oil inlet passage C1 Axial portion of oil inlet passage C2 Radial portion of oil inlet passage 12 Central oil control valve 121 Housing H1 First oil guide hole H2 Second oil guide hole H3 Oil inlet hole 122 Piston T Oil discharge passage S Space 123 Spring 13 Check valve assembly 131 Check valve plate 1311 Check valve disc 1312 Check valve disc positioning hole 132 Check valve stopper 1321 Check oil hole 1322 Check valve stopper positioning hole 133 Filter disc

[0029] 2 Camshaft P oil supply passage P1 annular oil chamber

[0030] AX is axial and RA is radial. DETAILED DESCRIPTION

[0031] The following will describe the specific embodiments of the present invention in conjunction with the accompanying drawings. The camshaft phaser according to the present invention has a generally cylindrical shape as a whole. Unless otherwise specified, the axial, radial and circumferential directions of the present invention refer to the axial, radial and circumferential directions of the camshaft phaser respectively; the axial side refers to the Figure 1a 、 Figure 2 、 Figure 3 The left side of the axis refers to Figure 1a 、 Figure 2 、 Figure 3 The right side of the Figure 1a 、 Figure 2 、 Figure 3 The radially inner side refers to the side away from the central axis of the camshaft phaser. Figure 1a 、 Figure 2 、 Figure 3 The side close to the center axis of the camshaft phaser.

[0032] The following will first describe an engine timing system according to a first embodiment of the present invention with reference to the accompanying drawings, wherein components such as a stator and an end cover of a camshaft phaser are omitted from the accompanying drawings.

[0033] (Engine Timing System According to First Embodiment of the Present Invention)

[0034] The basic structure of the engine timing system according to the present invention is substantially the same as that of the prior art engine timing system. Specifically, the engine timing system according to the first embodiment of the present invention includes a camshaft phasing device and a camshaft 2 mounted together.

[0035] Specifically, in this embodiment, the camshaft phaser 1 of the camshaft phasing device includes a stator (not shown), a rotor 11, and an end cap (not shown). The end cap is fixed to the stator from both axial sides, and the rotor 11 is positioned radially inward of the stator and is rotatable relative to the stator. Multiple groups of oil chambers are circumferentially distributed between the stator, rotor 11, and end cap. Each group of oil chambers is located between adjacent radially inwardly projecting protrusions of the stator. Each group of oil chambers includes a first oil chamber (also referred to as an A oil chamber) corresponding to the advanced phase and a second oil chamber (also referred to as a B oil chamber) corresponding to the retarded phase, separated from each other by radially outwardly extending vanes of the rotor 11. When the camshaft phaser 1 is phased toward the advanced phase, hydraulic oil enters the first oil chamber through the oil passage and propels the vanes of the rotor 11 toward the second oil chamber. When the camshaft phaser 1 is phased toward the retarded phase, oil enters the second oil chamber through the oil passage and propels the vanes of the rotor 11 toward the first oil chamber. Furthermore, the camshaft phasing device according to the present invention includes a central oil control valve 12, located radially inwardly of the rotor 11 and coaxially mounted therewith. This camshaft phaser 1 is a mid-mounted camshaft phaser. Hydraulic oil from the oil reservoir is controllably directed into the first or second oil chambers and / or out of the second or first oil chambers by the central oil control valve 12. The rotor 11 of the camshaft phaser 1 and the housing 121 of the central oil control valve 12 are fixed relative to the camshaft 2.

[0036] like Figure 1a As shown, the rotor 11 of the camshaft phaser 1 is formed with a first oil guide passage A that is always connected to each first oil chamber, a second oil guide passage B that is always connected to each second oil chamber, and an oil supply passage C that is always connected to an oil supply passage P formed in the camshaft 2 of the engine.

[0037] Specifically, each of the first oil guiding passages A extends along the radial direction RA, and an opening of each of the first oil guiding passages A corresponding to a first oil guiding hole H1 of the central oil control valve 12 described below is located at the same position in the axial direction AX. Each of the second oil guiding passages B extends along the radial direction RA, and an opening of each of the second oil guiding passages B corresponding to a second oil guiding hole H2 of the central oil control valve 12 described below is located at the same position in the axial direction AX and is spaced apart from the aforementioned opening of the first oil guiding passage A in the axial direction AX.

[0038] The oil inlet passage C includes an axial portion C1 and a radial portion C2, both of which communicate with each other. The axial portion C1 extends in the axial direction AX from the end face of the rotor 11 opposite the camshaft 2. The radial portion C2 is connected to one axial end of the axial portion C1 and extends in the radial direction RA to the face of the rotor 11 opposite the housing 121 of the central oil control valve 12. The openings of each radial portion C2, corresponding to the oil inlet holes H3 of the central oil control valve 12 described below, are located at the same position in the axial direction AX and are spaced apart from the aforementioned openings of the first oil guiding passage A and the second oil guiding passage B in the axial direction AX. In the axial direction AX, the aforementioned openings of the radial portion C2 are located between the aforementioned openings of the first oil guiding passage A and the aforementioned openings of the second oil guiding passage B.

[0039] Further, inside the rotor 11 , the first oil guide passage A, the second oil guide passage B, and the oil inlet passage C are separated from each other in the axial direction AX so that they are not directly connected to each other.

[0040] like Figure 1a As shown, the central oil control valve 12 includes a housing 121 fixed to the rotor 11 , a piston 122 located in the housing 121 and capable of reciprocating relative to the housing 121 along the axial direction AX, and a spring 123 located in the housing 121 .

[0041] Specifically, the housing 121 has a cylindrical shape with its other axial end closed. The housing 121 is fixedly mounted, for example, by an interference fit, in a mounting hole formed in the center of the rotor 11. The housing 121 includes a first oil guide hole H1 that is constantly connected to each first oil guide passage A, a second oil guide hole H2 that is constantly connected to each second oil guide passage B, and an oil inlet hole H3 that is constantly connected to each oil inlet passage C. The first oil guide hole H1, the second oil guide hole H2, and the oil inlet hole H3 are through-holes extending through the housing 121 in the radial direction RA, respectively connecting the first oil guide passage A, the second oil guide passage B, and the oil inlet passage C with the interior of the housing 121. In the axial direction AX, the oil inlet hole H3 is located between the first oil guide hole H1 and the second oil guide hole H2 and communicates with the space S between the two flange portions of the piston 122, described below.

[0042] Furthermore, piston 122 comprises a cylindrical main body and two flanges formed thereon, spaced apart from each other in the axial direction AX. These flanges divide the interior of housing 121 into distinct spaces. Space S located between the flanges is constantly connected to the oil inlet passage C via the oil inlet hole H3 of housing 121. Reciprocating motion of piston 122 along the axial direction AX allows this space S to communicate with the first oil passage A via the first oil guide hole H1 or with the second oil passage B via the second oil guide hole H2, thereby enabling hydraulic oil from oil inlet passage C to be selectively supplied to the first or second oil chambers via this space S. Furthermore, piston 122 is also formed with an oil drain passage T, which, likewise, allows for selective communication with the first or second oil passages A and B via reciprocating motion of piston 122 along the axial direction AX.

[0043] Furthermore, spring 123 is a cylindrical coil spring. One axial end of spring 123 abuts the other axial end of piston 122, and the other axial end of spring 123 abuts housing 121. Spring 123 can cooperate with a solenoid valve assembly (not shown) to control the reciprocating motion of piston 122 along axial direction AX in a desired manner.

[0044] like Figures 1a to 1e As shown, in this embodiment, the camshaft phasing device further includes a one-way valve assembly 13, which is disposed on the rotor 11 and is located at the same position of the oil inlet passage C and the opening of the oil inlet passage C opposite to the camshaft 2 in the radial direction RA. The one-way valve assembly 13 has an annular structure, so that it can cover all the openings of the oil inlet passage C opposite to the camshaft 2. Figure 1b As shown, the one-way valve assembly 13 includes a one-way valve plate 131, a one-way valve stopper 132, and a filter disc 133 arranged in the axial direction AX. The one-way valve plate 131, the one-way valve stopper 132, and the filter disc 133 can be fixed together. Among the three, the one-way valve plate 131 is located at one side in the axial direction, the filter disc 133 is located at the other side in the axial direction, and the one-way valve stopper 132 is located between the one-way valve plate 131 and the filter disc 133.

[0045] Specifically, if Figure 1c As shown, the one-way valve plate 131 has an annular shape. The annular plate body of the one-way valve plate 131 is formed with a one-way valve disc 1311 aligned with each oil inlet passage C. The one-way valve disc 1311 can only be opened by hydraulic oil from the oil supply passage P. The one-way valve plate 131 also has a one-way valve plate positioning hole 1312 that mates with a positioning protrusion (not shown) formed on the rotor 11. The cooperation between the positioning protrusion and the one-way valve plate positioning hole 1312 allows the one-way valve disc 1311 to be aligned with the oil inlet passage C.

[0046] Furthermore, if Figure 1dAs shown, the one-way valve stopper 132 has an annular shape. The annular body of the one-way valve stopper 132 defines a one-way oil hole 1321 aligned with the one-way valve disc 1311. The one-way valve stopper 132 also defines a one-way valve stopper positioning hole 1322 that mates with the aforementioned positioning protrusion formed on the rotor 11. The engagement of the positioning protrusion with the one-way valve stopper positioning hole 1322 aligns the one-way oil hole 1321 with the oil inlet passage C.

[0047] Furthermore, if Figure 1e As shown, the filter plate 133 has an annular shape and forms a large number of meshes, so that the hydraulic oil flowing into the one-way oil hole 1321 through the filter plate 133 is filtered when the filter plate 133 covers the one-way oil hole 1321 .

[0048] In this embodiment, if Figure 1a As shown, the camshaft 2 is fixed to the rotor 11 and the housing 121 of the central oil control valve 12 so as to be fixed relative to the rotor 11 and the housing 121. The camshaft 2 is formed with a plurality of oil supply passages P that are connected to the oil inlet passages C of the rotor 11 of the camshaft phaser 1. The plurality of oil supply passages P extend along the axial direction AX and are connected to the oil supply portion of the engine timing system so that hydraulic oil from the oil supply portion can flow into the oil supply passages P.

[0049] The structure of the engine timing system according to the first embodiment of the present invention has been described above. The operation of the timing system will be described below with examples.

[0050] For example, when the engine control unit issues a control command to shift the timing system toward the advanced phase, piston 122 moves toward the other axial direction along axial direction AX, connecting the space S between the two flanges of piston 122 with the oil inlet hole H3 and the first oil guide hole H1. Hydraulic oil from the oil supply unit is introduced into the oil inlet passage C via the one-way valve assembly 13. From there, the hydraulic oil is introduced into the space S between the two flanges of piston 122 via the oil inlet hole H3. From this space S, the hydraulic oil is introduced into the first oil guide passage A via the first oil guide hole H1, ultimately entering the first oil chamber. Simultaneously, hydraulic oil in the second oil chamber is introduced into the space axially to the side of the flange of piston 122 via the second oil guide passage B and the second oil guide hole H2. The oil then returns to the oil supply unit through the oil discharge passage T of piston 122. Consequently, the rotor 11 rotates relative to the stator under the influence of the hydraulic oil in the first oil chamber, achieving the phase shift toward the advanced phase.

[0051] The structure of the engine timing system according to the first embodiment of the present invention has been described above, and the operation process of the timing system has been exemplified. Now, the structure of the engine timing system according to the second embodiment of the present invention will be described below.

[0052] (Engine Timing System According to Second Embodiment of the Present Invention)

[0053] The basic structure of the engine timing system according to the second embodiment of the present invention is substantially the same as that of the engine timing system according to the first embodiment of the present invention, and the differences therebetween will be mainly described below.

[0054] like Figure 2 As shown, in this embodiment, the camshaft 2 is formed with an oil supply passage P that communicates with the oil supply passage C of the rotor 11 of the camshaft phaser 1. The oil supply passage P includes a portion extending along the radial direction RA and an annular oil chamber P1 formed at the intersection of the camshaft 2 and the camshaft phaser 1. The annular oil chamber P1 communicates with all of the oil supply passages C. This eliminates the need to align each oil supply passage P of the camshaft 2 with each oil supply passage C of the camshaft phaser 1 during installation of the camshaft 2, reducing installation costs compared to the first embodiment. Furthermore, the cost of machining the oil supply passage P on the camshaft 2 can be reduced compared to the first embodiment.

[0055] The structure of the engine timing system according to the second embodiment of the present invention has been described above, and the structure of the engine timing system according to the third embodiment of the present invention will be described below.

[0056] (Engine Timing System According to Third Embodiment of the Present Invention)

[0057] The basic structure of the engine timing system according to the third embodiment of the present invention is substantially the same as the basic structure of the engine timing system according to the first embodiment of the present invention, and the differences therebetween will be mainly described below.

[0058] like Figure 3 As shown, the check valve assembly 13 of the camshaft phaser 1 is not located in the oil inlet passage C. Instead, it is located in the housing 121 of the central oil control valve 12, at the oil inlet hole H3. In this embodiment, the check valve assembly 13 comprises a one-way valve formed by a spiral plate and a filter screen. The one-way valve opens only in response to hydraulic oil flowing through the oil inlet passage C. Specifically, when the hydraulic oil pressure from the oil inlet passage C acts on the one-way valve formed by the spiral plate, the diameter of the one-way valve decreases, allowing the hydraulic oil to enter the interior of the housing 121 of the central oil control valve 12 through the oil inlet hole H3.

[0059] The specific technical solutions of the present invention have been described in detail above, and the following supplementary explanations are provided.

[0060] i. Although not explicitly described in the above specific embodiments, it should be understood that in the camshaft phaser 1 for an engine timing system according to the present invention, the axial portion C1 of the oil inlet passage can be directly formed during the sintering process of the rotor 11, and the radial portion C2 of the oil inlet passage can be formed by green turning.

[0061] ii. In the engine timing system according to the present invention, the oil path of the hydraulic oil is shorter than that of the prior art, thereby being able to improve the performance of the timing system.

[0062] iii. Although not explicitly stated in the above specific embodiments, it should be understood that the filter disc may not be an annular whole, but may be a filter portion that only covers the one-way valve disc 1311 and the one-way oil hole 1321 .

Claims

1. A camshaft phasing device, comprising a camshaft phaser (1) and a central oil control valve (12) located in the camshaft phaser (1), wherein the camshaft phaser (1) comprises a stator and a rotor (11), wherein the rotor (11) is arranged radially inwardly of the stator and is rotatable relative to the stator, and a plurality of groups of oil chambers distributed along the circumferential direction are formed between the stator and the rotor (11), wherein each group of oil chambers comprises a first oil chamber and a second oil chamber separated from each other, and wherein the central oil control valve (12) is configured to be coaxially mounted on the radially inward side of the rotor (11). The rotor (11) is formed with a first oil guide passage (A) which is always connected to the first oil chamber, a second oil guide passage (B) which is always connected to the second oil chamber, and an oil supply passage (C) which is always connected to an oil supply passage (P) formed on a camshaft (2) of an engine, and The central oil control valve (12) includes a housing (121) fixed to the rotor (11) and a piston (122) located in the housing (121) and capable of reciprocating relative to the housing (121). The housing (121) is formed with a first oil guide hole (H1) that is always connected to the first oil guide passage (A), a second oil guide hole (H2) that is always connected to the second oil guide passage (B), and an oil inlet hole (H3) that is always connected to the oil inlet passage (C). The reciprocating motion of the piston (122) enables the oil inlet hole (H3) to selectively communicate with the first oil guide hole (H1) and the second oil guide hole (H2) through the space inside the housing (121). The camshaft phasing device further includes a one-way valve assembly (13), which is arranged on the housing (121) of the rotor (11) or the central oil control valve (12) so as to allow hydraulic oil to flow from the oil supply passage (P) through the oil inlet passage (C) and the oil inlet hole (H3) into the space inside the housing (121) in a one-way manner.

2. The camshaft phase adjustment device according to claim 1, characterized in that: The oil inlet passage (C) includes: an oil inlet passage axial portion (C1) extending in the axial direction (AX) from an end surface of the rotor (11) opposite to the camshaft (2); and An oil inlet passage radial portion (C2) is connected to the oil inlet passage axial portion (C1) and extends along the radial direction (RA) of the camshaft phaser (1) to a surface of the rotor (11) opposite to the housing (121).

3. The camshaft phasing device according to claim 1 or 2, characterized in that: The one-way valve assembly (13) is arranged on the oil inlet passage (C) to allow the oil inlet passage (C) to flow in a one-way manner.

4. The camshaft phase adjustment device according to claim 3, characterized in that: The one-way valve assembly (13) has an annular structure and includes a one-way valve plate (131), a one-way valve stopper (132) and a filter disc (133) arranged in the axial direction (AX), and The one-way valve plate (131) is formed with a one-way valve disc (1311) aligned with the oil inlet passage (C), and the one-way valve disc (1311) can only be opened under the action of hydraulic oil in the oil supply passage (P). The one-way valve stopper (132) is formed with a one-way oil hole (1321) aligned with the one-way valve disc (1311), and the filter disc (133) at least covers the one-way oil hole (1321).

5. The camshaft phase adjustment device according to claim 4, characterized in that: The rotor (11) is formed with a positioning protrusion, and the one-way valve plate (131) and the one-way valve stopper (132) are respectively formed with positioning holes that cooperate with the positioning protrusion, so that the one-way valve plate (1311) and the one-way oil hole (1321) can be aligned with the oil inlet passage (C) through the cooperation of the positioning protrusion and the positioning hole.

6. The camshaft phasing device according to claim 1 or 2, characterized in that: The one-way valve assembly (13) is arranged at the oil inlet hole (H3) to enable the oil inlet hole (H3) to be unidirectional.

7. The camshaft phasing device according to claim 6, characterized in that: The one-way valve assembly (13) comprises a one-way valve formed by a spiral plate and a filter screen, and the one-way valve can only be opened under the action of the hydraulic oil in the oil inlet passage (C).

8. A timing system for an engine, comprising a camshaft phase adjustment device and a camshaft (2) according to any one of claims 1 to 7, wherein the rotor (11) of the camshaft phaser (1) and the housing (121) of the central oil control valve (12) are fixed relative to the camshaft (2).

9. The engine timing system according to claim 8, characterized in that: The camshaft (2) is formed with a plurality of oil supply passages (P) respectively connected to the oil inlet passage (C) of the rotor (11) of the camshaft phaser (1).

10. The engine timing system according to claim 8, characterized in that: The camshaft (2) is formed with an oil supply passage (P) communicating with an oil inlet passage (C) of a rotor (11) of the camshaft phaser (1). The oil supply passage (P) includes an annular oil chamber (P1) communicating with all the oil inlet passages (C).

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