Anti-clogging engine oil control valve

Abstract

The utility model relates to an anti -blocking engine oil control valve belongs to engine OCV valve technical field. The utility model discloses the valve sleeve of tubular structure, five oil holes are set up on the valve sleeve along its axial direction, are oil inlet hole located the axial intermediate area of valve sleeve, the advance chamber oil hole located oil inlet hole one side, the lag chamber oil hole located oil inlet hole another side, correspondingly set up the first oil drain hole in the lag chamber oil hole opposite side, correspondingly set up the second oil drain hole in the advance chamber oil hole opposite side, the exhaust hole is set up on the valve sleeve in the outside and end of first oil drain hole, and the exhaust hole corresponding with the outside of first oil drain hole is communicated through the gap between valve sleeve and cylinder cover, and the space between the exhaust hole of valve sleeve inner end and the exhaust hole of outside jointly constitutes the standby oil drain passage. The utility model can be discharged through the passage formed by oil drain hole and exhaust hole, guarantees that VVT phaser will not be stuck because of unable oil drain.

Description

Technical Field

[0001] This utility model belongs to the field of engine OCV valve technology, specifically relating to an anti-clogging oil control valve. Background Technology

[0002] OCV valve is an abbreviation for Oil Control Valve, a core control component of the Variable Valve Timing (VVT) system. The engine control unit (ECU) sends a PWM signal to the oil control valve based on operating conditions, driving the internal valve core to move precisely. This directs oil from the engine's internal oil passages to the advance or lag chamber of the VVT ​​phaser, thereby rotating the camshaft and adjusting the valve opening and closing timing. The oil control valve is located inside the engine cylinder head. In existing technology, due to the small diameter of the oil drain passage in the cylinder head, it is prone to blockage due to molding deviations or impurities and gum in the oil. Once the drain passage is blocked, the oil in the VVT ​​phaser cannot drain properly, leading to slow response or even inability to adjust, ultimately causing engine failure. Utility Model Content

[0003] This invention addresses the aforementioned problems and overcomes the shortcomings of existing technologies by providing an anti-clogging oil control valve. This invention allows oil to be discharged through the channel formed by the drain hole and the vent hole, ensuring that the VVT ​​phaser will not become stuck due to the inability to drain oil.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] This utility model provides an anti-clogging oil control valve, including a cylindrical valve sleeve, a valve core movably disposed within the inner cavity of the valve sleeve, a return spring providing a reset force to the valve core, and a solenoid valve assembly drivenly connected to the valve core. The valve sleeve is characterized by having five oil holes along its axial direction: an oil inlet located in the middle region of the valve sleeve's axial direction; an advance chamber oil hole located on one side of the oil inlet and corresponding to the advance chamber of an external VVT phaser; a hysteresis chamber oil hole located on the other side of the oil inlet and corresponding to the hysteresis chamber of an external VVT phaser; and correspondingly disposed in... The first drain hole on the opposite side of the hysteresis chamber oil hole is correspondingly provided on the opposite side of the advance chamber oil hole. The oil inlet, the advance chamber oil hole, the hysteresis chamber oil hole, the first drain hole, and the second drain hole are respectively connected to each oil passage on the cylinder head outside the valve sleeve. Exhaust holes are provided on the valve sleeve at the outer side and end of the first drain hole. The first drain hole and the exhaust hole corresponding to the outer side are connected through the gap between the valve sleeve and the cylinder head. This gap, together with the space between the exhaust hole at the inner end of the valve sleeve and the exhaust hole on the outer side, constitute a spare drain channel.

[0006] Furthermore, the valve sleeve has a stepped structure, including a first outer diameter section connected to the oil inlet and a second outer diameter section connected to the vent, wherein the outer diameter of the first outer diameter section is larger than the outer diameter of the second outer diameter section.

[0007] Furthermore, the outer diameter of the first outer diameter section matches the inner diameter of the cylinder head inner wall, so that the oil inlet hole and the first oil drain hole are not directly connected. The outer diameter of the second outer diameter section is smaller than the inner diameter of the cylinder head inner wall, so that the first oil drain hole and the exhaust hole can form the backup oil drain channel in the space between the valve sleeve and the cylinder head.

[0008] Furthermore, when the valve core is moved in a controlled direction in the first direction, the oil inlet is connected to the hysteresis chamber oil hole, and the advance chamber oil hole is connected to the second drain hole; when the valve core moves in the second direction, the oil inlet is connected to the advance chamber oil hole, and the hysteresis chamber oil hole is connected to the first drain hole.

[0009] The beneficial effects of this utility model.

[0010] This invention boasts high anti-clogging reliability. By establishing a connected first drain hole and exhaust hole on the valve sleeve, a backup oil drain path is constructed, independent of the original small oil drain channel in the cylinder head. When the cylinder head oil drain channel is blocked by impurities or gum, the engine oil can be smoothly discharged through the backup channel, fundamentally avoiding VVT phaser sticking or response lag caused by poor oil draining, and greatly improving the operational reliability of the VVT ​​system. The structure is simple and practical; the implementation of this backup channel does not require additional complex parts or significant modifications to the engine block structure. By designing the valve sleeve with a specific stepped profile and rationally planning the oil hole positions, the assembly gap between the outer wall of the valve sleeve and the inner wall of the cylinder head is cleverly utilized to form an oil drain path. This solution has low modification costs, is easy to manufacture and assemble, and has good engineering practicality. Functions do not interfere with each other; the stepped valve sleeve structure ensures a sealed fit between the main oil inlet and the critical oil drain hole area and the cylinder head, preventing abnormal leakage or short circuit of the pressurized oil and ensuring the accuracy and stability of the basic adjustment function of the oil control valve. The backup drain channel is only passively activated when the main channel fails, without affecting the normal operating logic and performance of the valve, thus achieving efficient coordination between the protection function and the basic function. Attached Figure Description

[0011] To make the technical problems solved, the technical solutions, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model under phase adjustment conditions.

[0013] Figure 2 This is a schematic diagram of the structure of this utility model under the phase return condition.

[0014] The markings in the diagram are as follows: 1 is valve sleeve, 2 is valve core, 3 is return spring, 4 is solenoid valve assembly, 5 is oil inlet, 6 is advance chamber oil hole, 7 is lag chamber oil hole, 8 is first drain hole, 9 is second drain hole, 10 is exhaust hole, 11 is cylinder head, 12 is oil passage, 13 is spare drain passage, 14 is first outer diameter section, and 15 is second outer diameter section. Detailed Implementation

[0015] As shown in the accompanying drawings, this embodiment provides an anti-clogging oil control valve, including a cylindrical valve sleeve 1. The valve sleeve 1 has a stepped profile and includes a first outer diameter section 14 connected to the oil inlet 5 and a second outer diameter section 15 connected to the vent 10. The outer diameter of the first outer diameter section 14 is larger than the outer diameter of the second outer diameter section 15.

[0016] The valve core 2 is movably disposed within the inner cavity of the valve sleeve 1, and the return spring 3 is disposed within the valve sleeve 1 to provide a reset force to the valve core 2. The solenoid valve assembly 4 is drivenly connected to the valve core 2 to drive the valve core 2 to move.

[0017] Five oil holes are provided on the valve sleeve 1 along its axial direction. These are: an oil inlet hole 5 located in the middle region of the valve sleeve 1; an advance cavity oil hole 6 located on one side of the oil inlet hole 5 and corresponding to the advance cavity of the external VVT phaser; a hysteresis cavity oil hole 7 located on the other side of the oil inlet hole 5 and corresponding to the hysteresis cavity of the external VVT phaser; a first drain hole 8 located on the opposite side of the hysteresis cavity oil hole 7; and a second drain hole 9 located on the opposite side of the advance cavity oil hole 6.

[0018] The control valve is installed in the mounting hole of the engine cylinder head 11. The outer diameter of the first outer diameter section 14 is basically the same as the inner diameter of the inner wall of the cylinder head 11, forming a sealing fit to prevent the pressurized oil at the oil inlet 5 from directly bypassing the first drain hole 8, thus ensuring the basic function of the valve. The outer diameter of the second outer diameter section 15 is smaller than the inner diameter of the inner wall of the cylinder head 11, thereby forming an annular gap between the outer wall of the valve sleeve 1 and the inner wall of the cylinder head 11. Exhaust holes 10 are provided on the valve sleeve 1 at the outer side and the end of the first drain hole 8. The first drain hole 8 and the corresponding exhaust hole 10 on the outer side are connected through the annular gap between the valve sleeve 1 and the cylinder head 11. This gap, together with the space between the exhaust hole 10 at the inner end of the valve sleeve 1 and the exhaust hole 10 on the outer side, constitutes the backup drain channel 13. When the original drain channel in the cylinder head 11 is blocked, the oil can be discharged through the backup drain channel 13, ensuring that the VVT ​​phaser will not be stuck due to the inability to drain oil.

[0019] Oil inlet 5 is connected to a corresponding oil passage 12 on cylinder head 11 for oil to enter the valve; advance chamber oil hole 6 is connected to a corresponding oil passage 12 on cylinder head 11 for connecting the valve to the advance chamber of the VVT ​​phaser; lag chamber oil hole 7 is connected to a corresponding oil passage 12 on cylinder head 11 for connecting the valve to the lag chamber of the VVT ​​phaser; first drain hole 8 and second drain hole 9 are each connected to a corresponding oil passage 12 on cylinder head 11 to realize oil leakage to the valve under two different operating conditions.

[0020] The two operating conditions are phase adjustment and phase return, respectively. Phase adjustment is when the solenoid valve assembly 4 controls the valve core 2 to overcome the elastic force of the return spring 3, so that the valve core 2 moves in the first direction towards the return spring 3. Phase return is when the elastic force of the return spring 3 overcomes the electromagnetic force of the solenoid valve, so that the valve core 2 moves away from the return spring 3 in the second direction.

[0021] When the phase adjustment valve core 2 is moved in the first direction under control, the oil inlet 5 is connected to the lag chamber oil hole 7, and the advance chamber oil hole 6 is connected to the second drain hole 9; when the phase return valve core 2 moves in the second direction, the oil inlet 5 is connected to the advance chamber oil hole 6, and the lag chamber oil hole 7 is connected to the first drain hole 8.

[0022] The work process is as follows: Phase adjustment: When the oil control valve receives the engine computer signal, the duty cycle gradually increases to 100%. Due to the electromagnetic force of the solenoid valve overcoming the spring force of the return spring 3, the valve core 2 moves towards the return spring 3. At this time, the main oil passage oil enters from the oil inlet 5 into the lag chamber oil hole 7, and the oil in the advance chamber oil hole 6 is discharged through the second drain hole 9.

[0023] Phase return: When the oil control valve receives the engine computer signal, the duty cycle gradually decreases to 0%. Due to the elastic force of the return spring 3, the oil control valve overcomes the electromagnetic force of the solenoid valve, and the valve core 2 moves away from the return spring 3. At this time, the main oil passage oil enters from the oil inlet 5 to the advance chamber oil hole 6, and the oil in the lag chamber oil hole 7 is discharged through the first drain hole 8.

[0024] Anti-clogging process: During the phase return phase, the oil in the hysteresis chamber oil hole 7 is discharged through the first drain hole 8. Under normal circumstances, the oil is discharged through the oil passage 12 on the cylinder head 11 corresponding to the first drain hole 8. When the oil passage 12 corresponding to the first drain hole 8 is blocked, the oil discharged from the first drain hole 8 can flow into the backup drain passage 13 due to the existence of the backup drain passage 13, pass through the outer exhaust hole 10, and finally be discharged from the valve through the exhaust hole 10 at the end of the valve sleeve 1, thereby ensuring that the VVT ​​phaser will not be stuck due to the inability to drain oil.

[0025] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. An anti-clogging oil control valve, comprising a cylindrical valve sleeve (1), a valve core (2) movably disposed within the inner cavity of the valve sleeve (1), a return spring (3) providing a reset force to the valve core (2) and a solenoid valve assembly (4) drivenly connected to the valve core (2) are further disposed within the valve sleeve (1), characterized in that, Five oil holes are provided along the axial direction on the valve sleeve (1), namely, an oil inlet hole (5) located in the middle region of the axial direction of the valve sleeve (1), an advance cavity oil hole (6) located on one side of the oil inlet hole (5) and corresponding to the advance cavity of the external VVT phaser, a hysteresis cavity oil hole (7) located on the other side of the oil inlet hole (5) and corresponding to the hysteresis cavity of the external VVT phaser, a first drain hole (8) corresponding to the hysteresis cavity oil hole (7) and a second drain hole (9) corresponding to the advance cavity oil hole (6). The oil inlet hole (5), the advance cavity oil hole (6), and the hysteresis cavity oil hole (9) are respectively provided on the opposite side of the hysteresis cavity oil hole (7). 7) The first drain hole (8) and the second drain hole (9) are respectively connected to the oil passages (12) on the cylinder head (11) outside the valve sleeve (1). Exhaust holes (10) are provided on the valve sleeve (1) on the outside and at the end of the first drain hole (8). The first drain hole (8) and the exhaust hole (10) on the outside are connected through the gap between the valve sleeve (1) and the cylinder head (11). The gap and the space between the exhaust hole (10) at the inner end of the valve sleeve (1) and the exhaust hole (10) on the outside together form a spare drain channel (13).

2. The anti-clogging oil control valve according to claim 1, characterized in that, The valve sleeve (1) has a stepped structure, including a first outer diameter section (14) connected to the oil inlet (5) and a second outer diameter section (15) connected to the exhaust port (10). The outer diameter of the first outer diameter section (14) is larger than the outer diameter of the second outer diameter section (15).

3. The anti-clogging oil control valve according to claim 2, characterized in that, The outer diameter of the first outer diameter section (14) matches the inner diameter of the inner wall of the cylinder head (11), so that the oil inlet (5) and the first oil drain (8) are not directly connected. The outer diameter of the second outer diameter section (15) is smaller than the inner diameter of the inner wall of the cylinder head (11), so that the first oil drain (8) and the exhaust port (10) can form the backup oil drain channel (13) in the space between the valve sleeve (1) and the cylinder head (11).

4. The anti-clogging oil control valve according to claim 1, characterized in that, When the valve core (2) is moved in the first direction under control, the oil inlet (5) is connected to the hysteresis chamber oil hole (7), and the advance chamber oil hole (6) is connected to the second drain hole (9); when the valve core (2) moves in the second direction, the oil inlet (5) is connected to the advance chamber oil hole (6), and the hysteresis chamber oil hole (7) is connected to the first drain hole (8).

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