Phaser and engine variable valve timing system

Abstract

The present disclosure discloses a phaser and an engine variable valve timing system, belonging to the field of engines. The phaser includes a stator and a rotor, and the rotor is rotatably located radially inside the stator; the rotor includes a plurality of blade portions, the stator is provided with a plurality of oil cavity portions, and the plurality of blade portions are respectively located in the plurality of oil cavity portions and divide each oil cavity portion into an advance cavity and a retard cavity that are circumferentially distributed; at least one of the plurality of blade portions is provided with an internal circulation oil circuit structure, and both ends of the internal circulation oil circuit structure are respectively communicated with the advance cavity and the retard cavity corresponding to the blade portion; the internal circulation oil circuit structure is configured such that the oil can flow from one of the advance cavity and the retard cavity that is in a contracted state toward the other that is in an expanded state. The phaser of the present disclosure can achieve stable oil pressure supply, small oil pressure fluctuation, small phase retraction, and increase the stability of phase adjustment.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engines, and particularly to a phaser and an engine variable valve timing system. Background Art

[0002] The engine variable valve timing technology (Variable Valve Timing, VVT) is one of the new technologies gradually applied in recent years. By adopting the variable valve timing technology, the engine can increase the intake charge, increase the charge coefficient, and further improve the torque and power of the engine.

[0003] The phaser is the key to realizing the VVT technology. The rotor of the phaser is connected to the camshaft, and the rotor is driven by feeding oil pressure into the inner cavity of the phaser to realize the adjustment of the valve timing.

[0004] When the camshaft drives the rotor to rotate, the oil pressure in the advance chamber inside the phaser is squeezed, and the oil pressure in the retard chamber is lower than the target value due to the sluggishness of the oil supply, which will cause instability in the phase adjustment and a relatively large consumption of the oil in the inner cavity. Summary of the Invention

[0005] The present disclosure provides a phaser and an engine variable valve timing system, which can solve the problems of unstable phase adjustment and relatively large consumption of the oil in the inner cavity.

[0006] The technical solutions are as follows:

[0007] On the one hand, a phaser is provided. The phaser includes a stator and a rotor. The rotor is rotatably located radially inside the stator. The rotor includes a plurality of blade portions. The stator is provided with a plurality of oil cavity portions. The plurality of blade portions are respectively located in the plurality of oil cavity portions and divide each of the oil cavity portions into an advance chamber and a retard chamber distributed circumferentially.

[0008] At least one of the plurality of blade portions is provided with an internal circulation oil path structure. The two ends of the internal circulation oil path structure are respectively communicated with the advance chamber and the retard chamber corresponding to the blade portion.

[0009] The internal circulation oil path structure is configured such that the oil can flow from one of the advance chamber and the retard chamber in a contracted state to the other in an expanded state.

[0010] In some embodiments, the internal circulation oil path structure includes a first circulation channel and a first valve member. The first circulation channel is located on the blade portion, and the two ends of the first circulation channel are respectively communicated with the advance chamber and the retard chamber.

[0011] The first valve member is located within the first circulation passage; the first valve member is configured to adjust the switching direction according to the expansion state or contraction state of the advance chamber and the lag chamber, such that hydraulic fluid can flow from one in the contraction state towards the other in the expansion state.

[0012] In some embodiments, the extending direction of the first circulation passage within the blade portion coincides with one of the chord tangents of the rotor.

[0013] In some embodiments, the internal circulation oil path structure further includes a second circulation passage and a second valve member;

[0014] The second circulation passage is located on the rotor, and the second circulation passage communicates with the first circulation passage;

[0015] The rotor is provided with a first passage and a second passage;

[0016] One end of the first passage extends to the advance chamber, and the other end of the first passage extends to the shaft hole of the rotor to communicate with an external oil path system; one end of the second passage extends to the lag chamber, and the other end of the second passage extends to the shaft hole of the rotor to communicate with the external oil path system;

[0017] The second valve member is configured to, when the advance chamber is in the expansion state and the lag chamber is in the contraction state, connect the second circulation passage with the second passage; when the lag chamber is in the expansion state and the advance chamber is in the contraction state, connect the second circulation passage with the first passage.

[0018] In some embodiments, the first valve member includes a valve body portion and a valve plate portion;

[0019] The valve body portion is provided with an inlet, a first outlet, and a second outlet. The inlet corresponds to and communicates with the second circulation passage. The first outlet and the second outlet respectively communicate with the first circulation passage, and the first outlet communicates with the advance chamber through at least a portion of the first circulation passage, and the second outlet communicates with the lag chamber through at least a portion of the first circulation passage;

[0020] The valve plate portion includes a first valve plate and a second valve plate. The first valve plate covers the first outlet, and the second valve plate covers the second outlet.

[0021] In some embodiments, the valve plate portion further includes a U-shaped portion, and the first valve plate and the second valve plate are respectively located at two ends of the U-shaped portion;

[0022] The valve plate portion clamps the first valve plate and the second valve plate on the valve body portion through the U-shaped portion.

[0023] In some embodiments, the valve body portion is cubic, and the first outlet and the second outlet are respectively located on two opposite sides of the valve body portion.

[0024] In some embodiments, the phaser further includes a front cover plate and a rear cover plate, and the front cover plate and the rear cover plate are respectively located on two axial sides of the stator.

[0025] In some embodiments, the number of the blade portions is at least four, at least four blade portions are evenly distributed in the circumferential direction of the rotor, and the internal circulation oil path structure is respectively provided on each blade portion.

[0026] On the other hand, an engine variable valve timing system is provided, which adopts the phaser described in the present disclosure.

[0027] The beneficial effects brought by the technical solution provided by the present disclosure at least include:

[0028] For the phaser of the present disclosure, by arranging the internal circulation oil path structure on the blades of the rotor, when the advance chamber or the retard chamber is squeezed by the rotor to form high pressure, the oil can flow from one oil chamber to the other oil chamber, realizing stable oil pressure supply, small oil pressure fluctuation, small phase regression, and increasing the phase adjustment stability. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 is an exploded view of the structure of the phaser provided by the embodiment of the present disclosure;

[0031] Figure 2 is a partial structural schematic diagram of the phaser provided by the embodiment of the present disclosure;

[0032] Figure 3 is a structural schematic diagram of the first valve member provided by the embodiment of the present disclosure.

[0033] The reference numerals in the drawings are respectively represented as:

[0034] 1, stator; 11, oil chamber portion; 111, advance chamber; 112, retard chamber;

[0035] 2, rotor; 21, blade portion; 22, first channel; 23, second channel;

[0036] 3. Inner loop oil circuit structure; 31. First circulation channel; 32. First valve member; 321. Valve body part; 3211. Inlet; 3212. First outlet; 3213. Second outlet; 322. Valve plate part; 3221. First valve plate; 3222. Second valve plate; 3223. U-shaped part; 33. Second circulation channel; 34. Second valve member;

[0037] 4. Front cover plate;

[0038] 5. Rear cover plate. Detailed implementation mode

[0039] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0040] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the Figure 1 orientation or positional relationship shown, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure.

[0041] Unless otherwise defined, all technical terms used in the embodiments of the present disclosure have the same meaning as commonly understood by those of ordinary skill in the art.

[0042] Variable Valve Timing (VVT) is a technology used in automotive piston engines. The VVT technology can adjust the overlap time and timing (part or all of it) of the engine intake and exhaust systems, reducing fuel consumption and improving efficiency.

[0043] Piston engines usually intake and exhaust by lifting the throttle valve, and the lifting valve is directly or indirectly driven by a cam on the camshaft. In each intake and exhaust cycle, the cam drives the valve to open (lift) for a certain time (overlap time).

[0044] At high rotational speeds, the engine requires more air, but the intake valve may close before all the required air has entered, resulting in reduced performance. Therefore, the timing of valve opening and closing is crucial. A continuously open valve will cause fuel to be discharged from the engine without combustion, which will reduce the engine's performance and increase exhaust pollution. So, the idle speed of a racing engine cannot be too low. On the other hand, if the cam continuously keeps the valve open for a long time, as in the case of a racing car, problems will occur at lower rotational speeds.

[0045] The crankshaft drives the camshaft through a timing belt, gears, or a chain. The profile and position of the cams on the camshaft are usually optimized for a specific engine speed. Usually, this reduces the torque of the engine at low speeds and the power at high speeds. VVT technology enables it to change according to the engine operating conditions, improving the efficiency and power of the engine.

[0046] A phaser (Variable Cam Phaser, VCP), also known as a phase regulator, phase adjuster, etc., is a key actuator component of the VVT system. The solenoid valve controls the oil to enter the advance chamber or the retard chamber of the phaser to achieve phase adjustment.

[0047] However, in the related art, the advance chamber and the retard chamber of the phaser are isolated from each other. When phase adjustment is performed, the oil needs to flow back to the solenoid valve in its entirety and then be re-injected. This undoubtedly increases the oil circuit, increases the response time of the oil circuit, and at the same time results in a relatively large frictional work of the oil and increased consumption.

[0048] When the phaser performs phase adjustment, one oil chamber is squeezed and the other oil chamber is enlarged. However, due to a certain delay in the oil supply, the oil pressure in the chamber will be unstable, causing the phaser to vibrate and exacerbating the engine's noise problem.

[0049] Therefore, the present disclosure provides a phaser. When the advance chamber or the retard chamber is squeezed by the rotor to form a high pressure, the oil can flow from one oil chamber to the other oil chamber, achieving stable oil pressure replenishment, small oil pressure fluctuations, and small phase regression, and increasing the stability of phase adjustment.

[0050] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0051] Figure 1 is an exploded view of the structure of the phaser provided by an embodiment of the present disclosure, Figure 2 is a schematic diagram of a partial structure of the phaser provided by an embodiment of the present disclosure, where Figure 2 highlights the structure of the oil chamber portion 11 area.

[0052] On the one hand, in combination with Figure 1 、 2As shown in the figure, this embodiment provides a phaser, which includes a stator 1 and a rotor 2. The rotor 2 is rotatably located inside the stator 1 in the radial direction. The rotor 2 includes a plurality of blade parts 21, and the stator 1 is provided with a plurality of oil cavity parts 11. The plurality of blade parts 21 are respectively located in the plurality of oil cavity parts 11, and each oil cavity part 11 is divided into an advance cavity 111 and a retard cavity 112 that are circumferentially distributed.

[0053] At least one of the plurality of blade parts 21 is provided with an internal circulation oil path structure 3. The two ends of the internal circulation oil path structure 3 are respectively communicated with the advance cavity 111 and the retard cavity 112 corresponding to the blade part 21.

[0054] The internal circulation oil path structure 3 is configured such that the oil can flow from one of the advance cavity 111 and the retard cavity 112 that is in the expanded state to the other that is in the contracted state.

[0055] In the phaser of this embodiment, by arranging the internal circulation oil path structure 3 on the blades of the rotor 2, when the advance cavity 111 or the retard cavity 112 is squeezed by the rotor 2 to form a high pressure, the oil can flow from one oil cavity to the other oil cavity, realizing stable oil pressure replenishment, small oil pressure fluctuation, and small phase retraction, and increasing the stability of phase adjustment.

[0056] In some possible implementation manners, when the phaser performs phase advance adjustment, the rotor 2 rotates relative to the stator 1 in the direction where the retard cavity 112 is located. The volume of the advance cavity 111 increases and is in the expanded state, and the volume of the retard cavity 112 decreases and is in the contracted state. The solenoid valve will control the extraction of engine oil from the retard cavity 112 and at the same time inject engine oil into the advance cavity 111. However, due to the slowness of the oil path response, within a certain period of time, the engine oil in the retard cavity 112 is compressed and the pressure increases, and the advance cavity 111 has a pressure drop due to lack of sufficient engine oil injection. At this time, the oil pressure in the oil path is unstable, and the rotor 2 and the stator 1 will be affected by the oil pressure and vibrate to generate noise.

[0057] In this embodiment, when the oil pressure in the retard cavity 112 increases and the oil pressure in the advance cavity 111 decreases, the internal circulation oil path structure 3 works to directly inject the engine oil in the retard cavity 112 into the advance cavity 111, so that this part of the engine oil can be transferred without returning to the solenoid valve, which is beneficial to reducing phase retraction, reducing the amplitude of phase oscillation, and reducing the internal noise of the phaser during phaser adjustment.

[0058] In some other possible implementation manners, when the phaser performs phase retard adjustment, the rotor 2 rotates relative to the stator 1 in the direction where the advance cavity 111 is located. The volume of the retard cavity 112 increases and is in the expanded state, and the volume of the advance cavity 111 decreases and is in the contracted state.

[0059] When the oil pressure in the advance chamber 111 increases and the oil pressure in the lag chamber 112 decreases in this embodiment, the internal circulation oil path structure 3 operates to directly inject the engine oil in the advance chamber 111 into the lag chamber 112, so that this part of the engine oil can be transferred without returning to the solenoid valve.

[0060] In some possible implementation manners, the number of the blade portions 21 on the rotor 2, for example, is two, three, four, etc. Correspondingly, the number of the oil chamber portions 11 in the positioning is, for example, two, three, four, etc.

[0061] Optionally, at least one of the plurality of blade portions 21 is provided with the internal circulation oil path structure 3. It may be that one of the plurality of blade portions 21 is provided with the internal circulation oil path structure 3; or, two or more of the plurality of blade portions 21 are provided with the internal circulation oil path structure 3; or, each of the plurality of blade portions 21 is provided with the internal circulation oil path structure 3.

[0062] Combined Figure 1 、 2 As shown in

[0063] In some embodiments, the internal circulation oil path structure 3 includes a first circulation channel 31 and a first valve member 32. The first circulation channel 31 is located on the blade portion 21, and both ends of the first circulation channel 31 are respectively communicated with the advance chamber 111 and the lag chamber 112.

[0064] For the internal circulation oil path structure 3 of this embodiment, by using the first valve member 32 whose switching direction can be adjusted and arranging it on the first circulation channel 31 communicating between the advance chamber 111 and the lag chamber 112, the first valve member 32 can unidirectionally conduct the first circulation channel 31 according to the states of the advance chamber 111 and the lag chamber 112, so that the oil fluid can flow between the advance chamber 111 and the lag chamber 112.

[0065] The first circulation channel 31 is arranged on the blade portion 21 of the rotor 2, which can directly communicate the advance chamber 111 and the lag chamber 112. When the oil fluid circulates between the two chambers, the path is shorter, the transfer efficiency of the oil path between the two chambers is higher, and the system response speed is faster.

[0066] Combined Figure 2 As shown in

[0067] The first circulation passage 31 of this embodiment is arranged along one of the chord tangents of the rotor 2, and communicates with the advance chamber 111 and the lag chamber 112 on both sides of the blade portion 21 along the chord tangent direction respectively. The flow path of the oil is the shortest, and it will not affect the sealing isolation requirements between the advance chamber 111 and the lag chamber 112.

[0068] Combined with Figure 1 As shown, in some possible implementation manners, an installation hole along the axial direction of the rotor 2 is further provided on the blade portion 21. The installation hole extends inward from the end face of the rotor 2 to the first circulation passage 31. The first valve member 32 is installed in the installation hole, and a part of the first valve member 32 extends into the first circulation passage 31. This part is used to unidirectionally conduct the first circulation passage 31 according to the states of the advance chamber 111 and the lag chamber 112.

[0069] By using the installation hole axially opened on the rotor 2, the installation difficulty of the first valve member 32 can be reduced, and it will not affect the inherent structures of the rotor 2 and the stator 1, as well as the sealing isolation requirements between the advance chamber 111 and the lag chamber 112.

[0070] Optionally, the types of the first valve member 32 include but are not limited to check valves, globe valves, solenoid valves, etc. Further, the first valve member 32 is a two-way check valve, which can achieve unidirectional conduction under different conditions.

[0071] Combined with Figure 2 As shown, in some embodiments, the internal circulation oil path structure 3 further includes a second circulation passage 33 and a second valve member 34; the second circulation passage 33 is located on the rotor 2, and the second circulation passage 33 communicates with the first circulation passage 31.

[0072] The rotor 2 is provided with a first passage 22 and a second passage 23.

[0073] One end of the first passage 22 extends to the advance chamber 111, and the other end of the first passage 22 extends to the shaft hole of the rotor 2 and communicates with the external oil path system; one end of the second passage 23 extends to the lag chamber 112, and the other end of the second passage 23 extends to the shaft hole of the rotor 2 and communicates with the external oil path system.

[0074] The second valve member 34 is configured to communicate the second circulation passage 33 with the second passage 23 when the advance chamber 111 is in an expanded state and the lag chamber 112 is in a contracted state; and communicate the second circulation passage 33 with the first passage 22 when the lag chamber 112 is in an expanded state and the advance chamber 111 is in a contracted state.

[0075] To improve the reliability of the inner loop oil circuit structure 3, a second circulation channel 33, a first channel 22, and a second channel 23 are provided on the rotor 2. The second circulation channel 33 is connected to the first circulation channel 31. The first channel 22 communicates with the advance chamber 111 and is the main inlet and outlet channel for the oil in the advance chamber 111. The second channel 23 communicates with the retard chamber 112 and is the main inlet and outlet channel for the oil in the retard chamber 112. The second circulation channel 33 is also respectively connected to the first channel 22 and the second channel 23.

[0076] The second valve member 34 can control one of the first channel 22 and the second channel 23 to conduct with the second circulation channel 33, so as to use the second circulation channel 33 to introduce the oil into the first circulation channel 31 and finally inject it into the corresponding oil chamber.

[0077] In some possible implementation manners, the second valve member 34 is located at the shaft hole of the rotor 2, close to the external oil circuit system of the phaser, and can respond to the control signal of the external oil circuit system as early as possible to control the conduction state of the second circulation channel 33.

[0078] Optionally, the second valve member 34 is a bearing bush member or a shaft sleeve member sleeved at the shaft hole of the rotor 2, and an oil groove or an oil hole for oil to flow through is provided on the surface or inside of the bearing bush member.

[0079] In this embodiment, the external oil circuit system is controlled by the engine controller, can control the oil flow direction through the solenoid valve, use the first channel 22 to inject or extract oil into or from the advance chamber 111, and use the second channel 23 to inject or extract oil into or from the retard chamber 112 to realize the phase adjustment function of the phaser.

[0080] This embodiment uses the combination of the second valve member 34, the second circulation channel 33, the first valve member 32, and the first circulation channel 31 to realize that when the advance chamber 111 is in the expansion state and the retard chamber 112 is in the contraction state, the second circulation channel 33 is connected to the second channel 23, so that the oil can flow from the retard chamber 112 through the second channel 23, the second valve member 34, the second circulation channel 33, the first valve member 32, and the first circulation channel 31 into the advance chamber 111; when the retard chamber 112 is in the expansion state and the advance chamber 111 is in the contraction state, the second circulation channel 33 is connected to the first channel 22, so that the oil can flow from the advance chamber 111 through the first channel 22, the second valve member 34, the second circulation channel 33, the first valve member 32, and the first circulation channel 31 into the retard chamber 112.

[0081] Combined with Figure 3 As shown, in some embodiments, the first valve member 32 includes a valve body portion 321 and a valve sheet portion 322.

[0082] The valve body portion 321 is provided with an inlet 3211, a first outlet 3212 and a second outlet 3213. The inlet 3211 is correspondingly communicated with the second circulation passage 33. The first outlet 3212 and the second outlet 3213 are respectively communicated with the first circulation passage 31. And at least a part of the first outlet 3212 is communicated with the advance chamber 111 through the first circulation passage 31, and at least a part of the second outlet 3213 is communicated with the lag chamber 112 through the first circulation passage 31. The valve plate portion 322 includes a first valve plate 3221 and a second valve plate 3222. The first valve plate 3221 covers the first outlet 3212, and the second valve plate 3222 covers the second outlet 3213.

[0083] The first valve member 32 of this embodiment is arranged at the intersection of the second circulation passage 33 and the first circulation passage 31. The valve body portion 321 is provided with an inlet 3211, a first outlet 3212 and a second outlet 3213. The inlet 3211 is correspondingly communicated with the second circulation passage 33. The hydraulic oil in the second circulation passage 33 enters through the inlet 3211. At least a part of the first outlet 3212 is communicated with the advance chamber 111 through the first circulation passage 31. The first outlet 3212 is closed by the first valve plate 3221 covering it, and the second outlet 3213 is closed by the second valve plate 3222 covering it.

[0084] When the advance chamber 111 is in the expansion state and the lag chamber 112 is in the contraction state, the oil pressure in the advance chamber 111 is lower than the oil pressure in the lag chamber 112. Since the hydraulic oil in the first valve member 32 is communicated with the lag chamber 112 through the inlet 3211, the second circulation passage 33, the second valve member 34 and the second passage 23, that is, the oil pressures on both sides of the second valve plate 3222 are the same, and the hydraulic oil can push open the first valve plate 3221 covering the first outlet 3212 and enter the advance chamber 111 by using the pressure difference.

[0085] When the advance chamber 111 is in the contraction state and the lag chamber 112 is in the expansion state, the oil pressure in the advance chamber 111 is higher than the oil pressure in the lag chamber 112. Since the hydraulic oil in the first valve member 32 is communicated with the advance chamber 111 through the inlet 3211, the second circulation passage 33, the second valve member 34 and the first passage 22, that is, the oil pressures on both sides of the first valve plate 3221 are the same, and the hydraulic oil can push open the second valve plate 3222 covering the second outlet 3213 and enter the lag chamber 112 by using the pressure difference.

[0086] Combined Figure 3 As shown, in some embodiments, the valve plate portion 322 further includes a U-shaped portion 3223. The first valve plate 3221 and the second valve plate 3222 are respectively located at both ends of the U-shaped portion 3223. The valve plate portion 322 clamps the first valve plate 3221 and the second valve plate 3222 on the valve body portion 321 through the U-shaped portion 3223.

[0087] To simplify the structure of the first valve member 32 in this embodiment, the U-shaped portion 3223 is used to connect the first valve plate 3221 and the second valve plate 3222 together, so that the entire valve plate portion 322 has an elastic clamping characteristic, and can also provide an initial pre-tightening force for the first valve plate 3221 and the second valve plate 3222, so that the first valve plate 3221 and the second valve plate 3222 cover the first outlet 3212 and the second outlet 3213 in the initial state to prevent liquid leakage. When the oil pressure on both sides of the first valve plate 3221 or the second valve plate 3222 changes and the pressure difference is greater than the elastic force of the first valve plate 3221 and the second valve plate 3222, the first valve plate 3221 and the second valve plate 3222 can be opened.

[0088] Combined with Figure 3 As shown, in some embodiments, the valve body portion 321 is cubic, and the first outlet 3212 and the second outlet 3213 are respectively located on two opposite sides of the valve body portion 321.

[0089] In this embodiment, the valve body portion 321 is cubic, which is more conducive to processing and assembly. The first outlet 3212 and the second outlet 3213 are respectively located on two opposite sides of the valve body portion 321. Thus, when the first valve member 32 is inserted into the first circulation channel 31, the first circulation channel 31 is separated into two sections by the valve body portion 321, and the first outlet 3212 and the second outlet 3213 can just face one of the sections of the first circulation channel 31.

[0090] In addition, the first outlet 3212 and the second outlet 3213 are respectively located on two opposite sides of the valve body portion 321, which is more conducive to the clamping fit of the U-shaped valve plate portion 322.

[0091] In some possible implementation manners, the valve body portion 321 is provided with a groove structure corresponding to the structure of the valve plate portion 322. The valve plate portion 322 is located in the groove structure, which can play a positioning effect on the valve plate portion 322 and ensure the flatness of the surface of the first valve member 32, facilitating the assembly of the first valve member 32 and the rotor 2.

[0092] Combined with Figure 1 As shown, in some embodiments, the phaser further includes a front cover plate 4 and a rear cover plate 5, and the front cover plate 4 and the rear cover plate 5 are respectively located on both axial sides of the stator 1.

[0093] The front cover plate 4 and the rear cover plate 5 are used to seal both axial sides of the stator 1, and seal the axial ends of the advance chamber 111 and the retard chamber 112, so that the phaser can perform phase adjustment according to the phase adjustment requirements.

[0094] Combined with Figure 1As shown, in some embodiments, the number of blade portions 21 is at least four, and the at least four blade portions 21 are evenly distributed in the circumferential direction of the rotor 2. An internal circulation oil passage structure 3 is respectively provided on each blade portion 21. Optionally, the number of blade portions 21 is four, and the four blade portions 21 are cross-distributed in the circumferential direction of the rotor 2.

[0095] For the phaser of this embodiment, the rotor 2 has four blade portions 21 distributed in a cross shape, and an internal circulation oil passage structure 3 is respectively provided on each blade portion 21. The advance chamber 111 and the retard chamber 112 on both sides of each blade portion 21 can be respectively connected by the internal circulation oil passage structure 3 to compensate for the oil during the phase adjustment process, reduce the oil pressure fluctuation in the advance chamber 111 and the retard chamber 112, enhance the phase adjustment stability of the phaser, and improve the performance of the engine.

[0096] On the other hand, this embodiment provides an engine variable valve timing system that employs the phaser of the present disclosure.

[0097] The engine variable valve timing system of this embodiment employs the phaser of the present disclosure and has all the beneficial technical effects of all the embodiments herein.

[0098] As used herein, "a number of" and "at least one" mean one or more, and "a plurality of" and "at least two" mean two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0099] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present disclosure, "a plurality of" means two or more unless otherwise specifically defined.

[0100] In the description of this specification, the description with reference to terms such as "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present disclosure.

[0101] The above are only the embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A phaser, characterized in that, The phaser includes a stator (1) and a rotor (2), and the rotor (2) is rotatably located radially inside the stator (1); the rotor (2) includes a plurality of blade portions (21), the stator (1) is provided with a plurality of oil cavity portions (11), and the plurality of blade portions (21) are respectively located in the plurality of oil cavity portions (11) and divide each of the oil cavity portions (11) into an advance cavity (111) and a retard cavity (112) distributed circumferentially; At least one of the plurality of blade portions (21) is provided with an internal circulation oil path structure (3), and two ends of the internal circulation oil path structure (3) are respectively communicated with the corresponding advance cavity (111) and retard cavity (112) of the blade portion (21); The internal circulation oil path structure (3) is configured such that oil can flow from one of the advance cavity (111) and the retard cavity (112) in a contracted state towards the other in an expanded state; The internal circulation oil path structure (3) includes a first circulation channel (31) and a first valve member (32), the first circulation channel (31) is located on the blade portion (21), and two ends of the first circulation channel (31) are respectively communicated with the advance cavity (111) and the retard cavity (112); The first valve member (32) is located in the first circulation channel (31); the first valve member (32) is used to adjust the switching direction according to the expanded state or contracted state of the advance cavity (111) and the retard cavity (112) so that oil can flow from one in a contracted state towards the other in an expanded state; The internal circulation oil path structure (3) further includes a second circulation channel (33) and a second valve member (34); The second circulation channel (33) is located on the rotor (2), and the second circulation channel (33) is communicated with the first circulation channel (31); The rotor (2) is provided with a first channel (22) and a second channel (23); One end of the first channel (22) extends to the advance cavity (111), and the other end of the first channel (22) extends to the shaft hole of the rotor (2) and is communicated with an external oil path system; one end of the second channel (23) extends to the retard cavity (112), and the other end of the second channel (23) extends to the shaft hole of the rotor (2) and is communicated with an external oil path system; The second valve member (34) is configured to communicate the second circulation channel (33) with the second channel (23) when the advance cavity (111) is in an expanded state and the retard cavity (112) is in a contracted state; and communicate the second circulation channel (33) with the first channel (22) when the retard cavity (112) is in an expanded state and the advance cavity (111) is in a contracted state.

2. The phaser according to claim 1, characterized in that, The extending direction of the first circulation channel (31) in the blade portion (21) coincides with one of the chord tangents of the rotor (2).

3. The phaser according to claim 1, characterized in that, The first valve member (32) includes a valve body portion (321) and a valve plate portion (322); The valve body portion (321) is provided with an inlet (3211), a first outlet (3212) and a second outlet (3213). The inlet (3211) is correspondingly communicated with the second circulation passage (33). The first outlet (3212) and the second outlet (3213) are respectively communicated with the first circulation passage (31). And the first outlet (3212) is communicated with the advance chamber (111) through at least a part of the first circulation passage (31). The second outlet (3213) is communicated with the retard chamber (112) through at least a part of the first circulation passage (31). The valve plate portion (322) includes a first valve plate (3221) and a second valve plate (3222). The first valve plate (3221) covers the first outlet (3212). The second valve plate (3222) covers the second outlet (3213).

4. The phaser according to claim 3, characterized in that, The valve plate portion (322) further includes a U-shaped portion (3223). The first valve plate (3221) and the second valve plate (3222) are respectively located at two ends of the U-shaped portion (3223). The valve plate portion (322) clamps the first valve plate (3221) and the second valve plate (3222) on the valve body portion (321) through the U-shaped portion (3223).

5. The phaser according to claim 4, characterized in that, The valve body portion (321) is cubic. The first outlet (3212) and the second outlet (3213) are respectively located on two opposite side surfaces of the valve body portion (321).

6. The phaser according to claim 1, characterized in that, The phaser further includes a front cover plate (4) and a rear cover plate (5). The front cover plate (4) and the rear cover plate (5) are respectively located on two axial sides of the stator (1).

7. The phaser according to any one of claims 1-6, characterized in that The number of the vane portions (21) is at least four. At least four vane portions (21) are evenly distributed in the circumferential direction of the rotor (2). Each vane portion (21) is respectively provided with the internal circulation oil passage structure (3).

8. An engine variable valve timing system, characterized in that, The engine variable valve timing system adopts the phaser according to any one of claims 1-7.

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