Valve mechanism for realizing backflow type cylinder deactivation of engine and engine

Abstract

The utility model discloses a valve mechanism for realizing reverse-flow type cylinder deactivation of an engine and the engine, which can realize switching between a normal working mode and a reverse-flow cylinder deactivation mode of a valve and can realize quick switching between the two working modes according to the working condition of the engine. The main structure comprises an air distribution cam, a hydraulic tappet part, a control valve part, a hydraulic piston driving part, a hydraulic system and the like. By adjusting the control valve component, the protrusion of the gas distribution cam is in the closing period or the oil drainage period of the control valve component, an exhaust valve is normally opened in the exhaust stroke and is opened again in the air inlet stroke, an air inlet valve is closed in the air inlet stroke, backflow cylinder deactivation work of an engine is achieved, fuel economy under the low-speed small-load working condition is improved, and the service life of the engine is prolonged. And the method also plays an important role in exhaust heat management.

Description

Technical Field

[0001] The utility model relates to a valve mechanism of an engine, in particular to a reflux type cylinder deactivation device in a hydraulic valve mechanism of an engine and an engine. Background Art

[0002] Cylinder deactivation technology, also known as variable displacement technology, is mainly used in multi-cylinder engines. Under partial load, the engine stops some cylinders from working, which can reduce pumping losses. At the same time, it improves the effective thermal efficiency of the engine, thereby improving fuel economy under partial load. When the vehicle needs high power output, the cylinders that were stopped will be put back into work.

[0003] Currently, the commonly used cylinder deactivation measures are: oil-stop-only cylinder deactivation, this method only shuts off the fuel injection of some cylinders, and the stopped cylinders continue to take in and exhaust air. The large amount of fresh air that enters affects the engine's emission after-treatment, and has a relatively severe negative impact on engine emissions; oil-stop and air-stop cylinder deactivation, this method stops the valve operation while stopping the cylinder fuel injection, but may cause negative pressure in the stopped cylinder and backflow of engine oil; oil-stop reflux cylinder deactivation, this method stops the cylinder fuel injection without fresh air intake and leads the exhaust gas back to the non-working cylinder, reducing the negative impact caused by heat transfer loss and solving the problem of oil backflow.

[0004] The existing mechanism for realizing oil stop and reflux cylinder deactivation currently leads the pipe from the exhaust pipe into the intake manifold. The size of this mechanism is too large, which makes the space occupied by the engine too large, and the conversion response is slow when reflux is performed outside the engine. Therefore, it is proposed to have a valve mechanism with a simple and compact structure and can be quickly converted to realize oil stop and reflux cylinder deactivation, which has great application significance. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art that the mechanism is too large and the opening and switching response is poor, the utility model proposes a valve mechanism and an engine that realizes exhaust reflow cylinder deactivation, so that the engine has no fresh air intake when the cylinder is deactivated, and the exhaust valve is opened twice at the same time to realize oil stop and reflow cylinder deactivation.

[0006] The utility model adopts the following technical solutions:

[0007] In the first aspect, the utility model proposes a valve mechanism for realizing exhaust gas reflow cylinder deactivation, including a valve cam, a hydraulic system, a hydraulic tappet component, a control valve component, and a hydraulic piston drive component:

[0008] The valve cam comprises an intake cam and an exhaust cam, wherein the exhaust cam is provided with a main protrusion and a secondary protrusion, the main protrusion is provided correspondingly to the exhaust stroke of the engine, and the secondary protrusion is provided correspondingly to the intake stroke of the engine;

[0009] The hydraulic system is provided with a high-pressure oil circuit, a low-pressure oil circuit, and an energy storage system;

[0010] A hydraulic tappet component, wherein the hydraulic tappet component includes a hydraulic tappet, a tappet sleeve, a tappet spring and a tappet oil chamber. The hydraulic tappet performs reciprocating linear motion under the action of the cam. The tappet oil chamber is connected to the high-pressure oil circuit. The hydraulic tappet is in contact with the driving cam at all times under the action of the tappet spring.

[0011] The control valve component includes a control valve core and a control valve sleeve. The control valve core is installed in the control valve sleeve and rotates synchronously with the valve cam. The control valve core is provided with a radial oil leakage hole of the control valve core and is connected with the low-pressure oil circuit. The control valve sleeve is driven to rotate by an external mechanism and is provided with a radial oil leakage hole of the control valve and is connected with the high-pressure oil circuit. When the radial oil leakage hole of the control valve sleeve is connected with the radial oil leakage hole of the control valve core, the control valve is in the oil leakage period; when the radial oil leakage hole of the control valve sleeve is staggered with the radial oil leakage hole of the control valve core, the control valve is in the closing period.

[0012] A hydraulic piston driving component, wherein the hydraulic piston driving component is provided with a hydraulic piston, a hydraulic piston sleeve and a hydraulic piston driving oil chamber, wherein the hydraulic piston is installed in the hydraulic piston sleeve, the hydraulic piston driving oil chamber is connected to the high-pressure oil circuit, and the hydraulic piston overcomes the valve spring force under the action of the hydraulic oil pressure to drive the valve to open.

[0013] Furthermore, the control valve sleeve is divided into an intake control valve sleeve and an exhaust control valve sleeve, and the control valve core is installed in the intake control valve sleeve and the exhaust control valve sleeve; the control valve core is provided with an intake valve core radial oil drain hole and an exhaust valve core radial oil drain hole; radial oil drain holes are provided on both the intake control valve sleeve and the exhaust control valve sleeve; the radial oil drain hole of the intake control valve sleeve matches the rising section of the intake cam protrusion, and the radial oil drain hole of the exhaust control valve sleeve matches the rising section of the exhaust cam secondary protrusion.

[0014] Furthermore, the intake oil leakage period formed by the intake valve sleeve and the radial oil leakage holes of the intake valve core is greater than the wrap angle of the rising section of the intake cam protrusion, and the exhaust oil leakage period formed by the exhaust valve sleeve and the radial oil leakage holes of the exhaust valve core is greater than the wrap angle of the rising section of the exhaust cam auxiliary protrusion.

[0015] Furthermore, the intake oil leakage period formed by the intake valve sleeve and the control valve core intake radial oil leakage hole is greater than the intake cam protrusion rising section wrap angle, and the exhaust oil leakage period formed by the exhaust valve sleeve and the exhaust valve core radial oil leakage hole is greater than the exhaust cam auxiliary protrusion rising section wrap angle.

[0016] Furthermore, the control valve sleeve is provided with an intake radial oil leakage hole and an exhaust radial oil leakage hole, and the control valve core is also provided with an intake radial oil leakage hole and an exhaust radial oil leakage hole.

[0017] Furthermore, the hydraulic tappet is a plane hydraulic tappet or a roller hydraulic tappet; the valve cam directly drives the hydraulic tappet; or the valve cam drives the hydraulic tappet to move through a roller rocker arm assembly or through a "tappetizer + rocker" assembly, and the external driving device of the control valve sleeve is a stepper motor, a DC motor, a rotary electromagnet or a hydraulic swing cylinder.

[0018] Furthermore, the intake hydraulic piston and the exhaust hydraulic piston drive the intake valve and the exhaust valve to reciprocate respectively; or the intake hydraulic piston and the exhaust hydraulic piston drive two or more intake valves and the exhaust valve to reciprocate respectively through the valve bridge.

[0019] Furthermore, the high-pressure oil circuit is provided with a high-pressure one-way valve, the low-pressure oil circuit is provided with a low-pressure one-way valve and an oil pump, and the energy storage system is provided with an accumulator and a relief valve.

[0020] In a second aspect, the utility model further discloses an engine, which includes the valve mechanism for realizing exhaust gas reflow type cylinder deactivation as described above.

[0021] In a third aspect, the utility model also provides a valve mechanism and an engine for realizing a backflow cylinder deactivation, including an exhaust cam, a hydraulic system, a hydraulic tappet component, an exhaust control valve component, a hydraulic piston drive component and an intake manifold on-off valve;

[0022] An exhaust cam, wherein a main lobe and a secondary lobe are arranged on the exhaust cam, wherein the main lobe is arranged on the exhaust stroke of the engine, and the secondary lobe is arranged on the intake stroke of the engine;

[0023] The hydraulic system is provided with a high-pressure oil circuit, a low-pressure oil circuit and an energy storage system;

[0024] A hydraulic tappet component, comprising a hydraulic tappet, a tappet sleeve, a tappet spring and a tappet oil chamber, wherein the hydraulic tappet performs reciprocating linear motion under the action of the cam, the tappet oil chamber is connected to the high-pressure oil circuit, and the hydraulic tappet maintains contact with the driving cam under the action of the tappet spring;

[0025] An exhaust control valve component, comprising an exhaust control valve core and an exhaust control valve sleeve, wherein the exhaust control valve core is installed in the exhaust control valve sleeve and rotates synchronously with the exhaust cam, the exhaust control valve core is provided with a radial oil leakage hole and is connected with a low-pressure oil circuit; the exhaust control valve sleeve is driven to rotate by an external mechanism and is provided with a radial oil leakage hole, and the radial oil leakage hole of the exhaust valve sleeve is connected with the high-pressure oil circuit; when the radial oil leakage hole of the exhaust valve sleeve is connected with the radial oil leakage hole of the exhaust valve core, the exhaust control valve is in an oil leakage period, and when the radial oil leakage hole of the exhaust valve sleeve is staggered with the radial oil leakage hole of the exhaust valve core, the exhaust control valve is in a closed period;

[0026] A hydraulic piston driving component, which is provided with a hydraulic piston, a hydraulic piston sleeve and a hydraulic piston driving oil chamber. The hydraulic piston is installed in the hydraulic piston sleeve. The hydraulic piston driving oil chamber is connected to the high-pressure oil circuit. The hydraulic piston overcomes the valve spring force under the action of the hydraulic oil pressure to drive the valve to open;

[0027] The intake manifold on-off valve is installed in the intake manifold of each cylinder.

[0028] As a further technical solution, the intake manifold throttle valve can be arranged in the intake manifold of a certain cylinder on the engine, or in the intake manifold shared by two or more cylinders.

[0029] As a further technical solution, the hydraulic tappet is a flat hydraulic tappet or a roller hydraulic tappet; the exhaust cam directly drives the hydraulic tappet; or the valve cam drives the hydraulic tappet to move through a roller rocker arm assembly or through a "tappetizer + rocker" assembly, and the external driving device of the control valve sleeve is a stepper motor, a DC motor, a rotary electromagnet or a hydraulic swing cylinder.

[0030] As a further technical solution, the hydraulic piston directly drives the exhaust valve to reciprocate; or the hydraulic piston drives two or more exhaust valves to reciprocate through a valve bridge.

[0031] As a further technical solution, the high-pressure oil circuit is provided with a high-pressure one-way valve, the low-pressure oil circuit is provided with a low-pressure one-way valve and an oil pump, and the energy storage system is provided with an accumulator and a relief valve.

[0032] In a fourth aspect, the utility model further discloses an engine, which includes the valve mechanism for realizing exhaust gas reflow type cylinder deactivation as described above.

[0033] Taking the first valve mechanism for realizing exhaust gas recirculation cylinder deactivation as an example, the working process of the utility model is described as follows:

[0034] When the hydraulic valve mechanism is in the "normal working mode", when the main protrusion of the exhaust cam drives the exhaust hydraulic tappet, the control valve is in the closing period, and the hydraulic oil in the exhaust hydraulic tappet oil chamber enters the exhaust hydraulic piston driving oil chamber through the high-pressure oil circuit and drives the exhaust valve to move; when the secondary protrusion of the exhaust cam drives the exhaust hydraulic tappet, the hydraulic oil in the exhaust hydraulic tappet oil chamber enters the low-pressure oil circuit through the radial oil drain hole of the control valve sleeve and the radial oil drain hole of the control valve core, and the exhaust hydraulic piston does not drive the exhaust valve to move; when the intake cam drives the intake hydraulic tappet, the control valve is in the closing period, and the hydraulic oil in the intake hydraulic tappet oil chamber enters the intake hydraulic piston driving oil chamber through the high-pressure oil circuit and drives the intake valve to move; the engine achieves normal operation according to the working modes of intake, compression, power and exhaust.

[0035] When the hydraulic valve mechanism is in the "reflux cylinder deactivation mode", when the exhaust cam main protrusion drives the exhaust hydraulic tappet, the control valve is in the closing period, and the hydraulic oil in the exhaust hydraulic tappet oil chamber enters the exhaust hydraulic piston driving oil chamber through the high-pressure oil circuit and drives the exhaust valve to move; when the exhaust cam secondary protrusion drives the exhaust hydraulic tappet, the control valve is in the closing period, and the hydraulic oil in the exhaust hydraulic tappet oil chamber enters the exhaust hydraulic piston driving oil chamber through the high-pressure oil circuit and drives the exhaust valve to move; when the intake cam drives the intake hydraulic tappet, the control valve is in the oil leakage period, and the hydraulic oil in the intake hydraulic tappet oil chamber enters the low-pressure oil circuit through the radial oil leakage hole of the control valve sleeve and the radial oil leakage hole of the control valve core, and the intake hydraulic piston does not drive the intake valve to move; when the engine is in the "reflux cylinder deactivation mode", during the intake stroke, the intake valves of some cylinders are closed, the exhaust valves are opened twice, and the high-temperature exhaust gas flows back from the exhaust pipe to the cylinder, and is discharged from the cylinder during the exhaust stroke, thereby realizing the reflux cylinder deactivation work of reflux, compression, expansion, and exhaust.

[0036] The hydraulic oil of the hydraulic system is supplied by the engine lubrication system. The low-pressure system can store hydraulic oil and provide sufficient and stable hydraulic oil to the low-pressure oil channel. When the high-pressure oil circuit leaks oil to the low-pressure oil circuit, the oil pressure in the low-pressure oil circuit will be unstable. The accumulator in the energy storage system is used to store and release hydraulic pressure energy to reduce the fluctuation of hydraulic pressure. When the amount of hydraulic oil entering the hydraulic system is too much, the overflow valve is used to discharge the excess oil from the hydraulic system to ensure the normal operation of the hydraulic valve mechanism. The combined action of the accumulator and the overflow valve maintains the relative pressure in the hydraulic system between 0MPa and 2MPa.

[0037] In the second valve mechanism for realizing exhaust gas recirculation cylinder deactivation, the exhaust control valve part is the same as the first solution, and will not be described here. The relevant parts of the intake control valve are changed to the intake manifold on-off valve, which is different from the first solution in working as follows:

[0038] In the "normal working mode", all the intake manifold on-off valves remain open. At this time, the engine operates normally according to the working modes of intake, compression, power and exhaust.

[0039] In the "reflux cylinder deactivation mode", some of the intake manifold on-off valves remain closed. At this time, some of the engine cylinders stop taking in fresh air during the intake stroke, and the exhaust valves open again. The high-temperature exhaust gas flows back into the cylinder from the exhaust pipe and is discharged from the cylinder during the exhaust stroke, thereby realizing the reflux cylinder deactivation work of reflux, compression, expansion, and exhaust.

[0040] Compared with the prior art, the beneficial effects of the utility model are:

[0041] The utility model can realize that part of the cylinders of the engine have no fresh air intake in the cylinder deactivation working mode, and the exhaust valve is opened twice in the exhaust stroke and the intake stroke, which can increase the exhaust temperature of the engine and avoid the problem of oil back suction. The utility model can realize the oil stop and reflux cylinder deactivation working mode of the engine with relatively small changes in the size of the engine. The valve mechanism for realizing reflux cylinder deactivation provided by the utility model can realize a smooth and rapid conversion between the normal working mode of the engine and the reflux cylinder deactivation mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings in the specification are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0043] Figure 1 A schematic diagram of an exhaust valve mechanism for realizing a reflow cylinder deactivation disclosed in Embodiment 1 or Embodiment 2;

[0044] Figure 2 A schematic diagram of an intake valve mechanism for realizing a reflow cylinder deactivation disclosed in Example 1;

[0045] Figure 3 A schematic diagram of an engine cylinder head and intake and exhaust pipes for realizing a reflow cylinder deactivation in Example 2;

[0046] Figure 4 Schematic diagram of valve lift in normal working mode in Embodiment 1 and Embodiment 2;

[0047] Figure 5 It is a schematic diagram of the valve lift of the cylinder that stops working in the backflow cylinder deactivation mode in Example 1;

[0048] Figure 6 It is a schematic diagram of the valve lift of the cylinder that stops working in the backflow cylinder deactivation mode in Example 2;

[0049] Figure 7 A schematic diagram of the cam disclosed in Example 1 or Example 2 pushing the hydraulic tappet to move through the roller rocker arm assembly;

[0050] Figure 8 A schematic diagram of the cam disclosed in Example 1 or Example 2 pushing the hydraulic tappet to move through the "tappetizer + push rod" assembly;

[0051] Fig. 9 A schematic diagram of an engine cylinder head and an intake and exhaust pipe in which an intake manifold on-off valve is arranged in an intake manifold shared by multiple cylinders in Example 2;

[0052] Reference numerals:

[0053] 1. Exhaust cam, 1-1. Exhaust cam main protrusion, 1-2. Exhaust cam auxiliary protrusion, 2. Hydraulic tappet component, 2-1. Tappet spring, 2-2. Hydraulic tappet, 2-3. Tappet sleeve, 2-4. Tappet oil chamber, 3. Control valve, 3-1. Exhaust control valve sleeve, 3-1-1. Exhaust control valve sleeve radial oil drain hole, 3-2. Intake control valve sleeve, 3-2-1. Intake control valve sleeve radial oil drain hole, 3-3. Control valve core, 3-3-1. Exhaust radial oil unloading hole, 3-3-2. Intake radial oil unloading hole, 4. High-pressure oil circuit, 4-1. High-pressure one-way valve; 5. Hydraulic piston drive component; 5-1. Hydraulic piston; 5-2. Hydraulic piston sleeve; 5-3. Hydraulic piston drive oil chamber; 6. Exhaust valve; 7. Low-pressure oil circuit; 7-1. Low-pressure one-way valve; 7-2. Hydraulic oil pump; 8. Energy storage system; 8-1. Accumulator; 8-2. Overflow valve; 9. Intake cam; 9-1. Intake cam protrusion; 10. Intake valve; 11. Intake pipe; 11-1. Intake manifold throttle valve; 12. Exhaust pipe; 13. Roller rocker arm assembly; 14. "Tappetizer + push rod" assembly. DETAILED DESCRIPTION

[0054] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0055] Embodiment 1:

[0056] This embodiment provides a valve mechanism for realizing reflow cylinder deactivation, which can realize switching between the reflow cylinder deactivation working mode and the normal working mode of the engine.

[0057] like Figure 1 and Figure 2 As shown, this embodiment includes an exhaust cam 1, a hydraulic tappet component 2, a control valve 3, a high-pressure oil circuit 4, a hydraulic piston drive component 5, an exhaust valve 6, a low-pressure oil circuit 7, an energy storage system 8, an intake cam 9, and an intake valve 10.

[0058] The exhaust cam 1 is provided with a main lobe 1-1 and a secondary lobe 1-2. The main lobe 1-1 is provided corresponding to the exhaust stroke of the engine, and the secondary lobe 1-2 is provided corresponding to the intake stroke of the engine.

[0059] The hydraulic tappet component 2 includes a tappet spring 2-1, a hydraulic tappet 2-2 and a hydraulic tappet sleeve 2-3. The hydraulic tappet 2-2 is installed in the hydraulic tappet sleeve 2-3. A tappet oil chamber 2-4 is provided between the hydraulic tappet 2-2 and the hydraulic tappet sleeve 2-3. The hydraulic tappet 2-2 is always in contact with the valve cam under the action of the tappet spring 2-1, and reciprocates under the action of the valve cam. The tappet oil chamber 2-4 is connected to the high-pressure oil circuit 4.

[0060] The control valve 3 includes an exhaust control valve sleeve 3-1, an intake control valve sleeve 3-2 and a control valve core 3-3. The control valve core 3-3 is installed in the exhaust control valve sleeve 3-1 and the intake control valve sleeve 3-2 and rotates synchronously with the valve cam. The control valve core 3-3 is provided with an exhaust radial oil unloading hole 3-3-1 and an intake radial oil unloading hole 3-3-2 and is connected to the low-pressure oil circuit 7. The exhaust control valve sleeve 3-1 and the intake control valve sleeve 3-2 are driven to rotate by an external mechanism. The exhaust control valve sleeve 3-1 is provided with an exhaust control valve sleeve radial oil leakage hole 3-1-1 and is connected to the high-pressure oil circuit 4. When the exhaust control valve sleeve radial oil leakage hole 3-1-1 is connected with the control valve core exhaust radial oil leakage hole 3-3-1, the control valve is in exhaust oil leakage. period, the exhaust oil leakage period is greater than the rising section wrap angle of the exhaust cam secondary protrusion 1-2, when the exhaust control valve sleeve radial oil leakage hole 3-1-1 is staggered with the control valve core exhaust radial oil leakage hole 3-3-1, the control valve is in the exhaust closing period; the intake control valve sleeve 3-2 is provided with an intake control valve sleeve radial oil leakage hole 3-2-1 and is connected with the high-pressure oil circuit 4, when the intake control valve sleeve radial oil leakage hole 3-2-1 is connected with the control valve core intake radial oil leakage hole 3-3-2, the control valve is in the intake oil leakage period, the intake oil leakage period is greater than the rising section wrap angle of the intake cam protrusion 9-1, when the intake control valve sleeve radial oil leakage hole 3-2-1 is staggered with the control valve core intake radial oil leakage hole 3-3-2, the control valve is in the intake closing period.

[0061] The high-pressure oil circuit 4 is provided with a high-pressure one-way valve 4 - 1 , and the high-pressure oil circuit 4 is connected with the hydraulic tappet oil chamber 2 - 4 and the hydraulic piston drive oil chamber 5 - 3 .

[0062] The hydraulic piston driving component 5 includes a hydraulic piston 5-1 and a hydraulic piston sleeve 5-2. The hydraulic piston 5-1 is installed in the hydraulic piston sleeve 5-2. A hydraulic piston driving oil chamber 5-3 is provided between the hydraulic piston 5-1 and the hydraulic piston sleeve 5-2. The hydraulic piston driving oil chamber 5-3 is connected to the high-pressure oil circuit 4. The hydraulic piston 5-1 overcomes the valve spring force under the action of the hydraulic oil pressure to drive the valve to open.

[0063] The low-pressure oil circuit 7 is provided with a low-pressure one-way valve 7-1 and a hydraulic oil pump 7-2. The hydraulic oil in the low-pressure oil circuit 7 is provided by the engine lubrication system, and the hydraulic oil pump 7-2 is the engine oil pump.

[0064] The energy storage system 8 is provided with an accumulator 8 - 1 and a relief valve 8 - 2 . The accumulator 8 - 1 is connected to the low-pressure oil circuit 7 , and the relief valve 8 - 2 is connected to the low-pressure oil circuit 7 and the engine lubrication system.

[0065] The intake cam 9 is provided with an intake cam protrusion 9 - 1 , which is arranged correspondingly to the intake stroke of the engine.

[0066] During operation, the engine crankshaft drives the valve cam to rotate. The movement of the exhaust valve 6 can be controlled by changing the position of the exhaust control valve sleeve 3-1, and the movement of the intake valve 10 can be controlled by changing the position of the intake control valve sleeve 3-2, thereby realizing the switching between the normal working mode of the engine and the reflux cylinder deactivation mode.

[0067] (1) When the engine is in normal working mode, by changing the position of the exhaust valve control valve sleeve 3-1 and the intake valve control valve sleeve 3-2, the exhaust oil leakage period is in the rising section of the exhaust cam secondary lobe, and the intake oil leakage period is in the base circle section of the intake cam.

[0068] As the exhaust cam 1 rotates, when the exhaust cam main protrusion 1-1 drives the hydraulic tappet 2-2, the control valve 3 is in the exhaust closing period, and the hydraulic tappet 2-2 compresses the hydraulic oil in the tappet oil chamber 2-4 and enters the hydraulic piston driving oil chamber 5-3 through the high-pressure oil circuit 4, pushing the hydraulic piston 5-1 to overcome the valve spring force to open the exhaust valve 6, and the exhaust valve 6 opens in the exhaust stroke. When the exhaust cam auxiliary protrusion 1-2 drives the hydraulic tappet 2-2, the control valve 3 is in the exhaust oil leakage period, and the hydraulic tappet 2-2 compresses the hydraulic oil in the tappet oil chamber 2-4 through the high-pressure oil circuit 4, in turn, through the exhaust control valve sleeve radial oil leakage hole 3-11, the control valve core exhaust radial oil unloading hole 3-21, and the low-pressure oil circuit 7 into the accumulator 8-1 of the energy storage system 8, and the exhaust valve 6 cannot be opened in the intake stroke. After the oil leakage, the oil pressure in the high-pressure oil circuit 4 will be lower than that in the accumulator 8-1, and the oil in the accumulator 8-1 will replenish the high-pressure oil circuit 4 through the high-pressure check valve 4-1.

[0069] As the intake cam 9 rotates, when the intake cam protrusion 9-1 drives the hydraulic tappet 2-2, the control valve is in the intake closing period, and the hydraulic tappet 2-2 compresses the hydraulic oil in the tappet oil chamber 2-4 through the high-pressure oil circuit 4 into the hydraulic piston driving oil chamber 5-3, pushing the hydraulic piston 5-1 to overcome the valve spring force to open the intake valve 10, and the intake valve opens during the intake stroke.

[0070] At this time, the engine performs normal work according to the working mode of intake, compression, power and exhaust. Figure 4 This is a schematic diagram of the valve lift curve during normal engine working mode.

[0071] (2) When the engine is in the reflux cylinder deactivation mode, by adjusting the exhaust valve control valve sleeve 3-1 position and the intake valve control valve sleeve 10-1 position of some cylinders, the exhaust cam main lobe 1-1 is in the closing period of the exhaust control valve 3, the exhaust cam secondary lobe 1-2 is in the closing period of the exhaust control valve 3, and the intake cam lobe 9-1 is in the closing period of the intake control valve 10.

[0072] As the exhaust cam 1 rotates, when the exhaust cam main protrusion 1-1 drives the hydraulic tappet 2-2, the control valve 3 is in the exhaust closing period, and the hydraulic tappet 2-2 compresses the hydraulic oil in the tappet oil chamber 2-4 and enters the hydraulic piston driving oil chamber 5-3 through the high-pressure oil circuit 4, pushing the hydraulic piston 5-1 to overcome the valve spring force to open the exhaust valve 6, and the exhaust valve 6 opens during the exhaust stroke. When the exhaust cam secondary protrusion 1-2 drives the hydraulic tappet 2-2, the control valve 3 is in the exhaust closing period, and the hydraulic tappet 2-2 compresses the hydraulic oil in the tappet oil chamber 2-4 and enters the hydraulic piston driving oil chamber 5-3 through the high-pressure oil circuit 4, pushing the hydraulic piston 5-1 to overcome the valve spring force to open the exhaust valve 6, and the exhaust valve 6 opens again during the intake stroke.

[0073] As the intake cam 9 rotates, when the intake cam protrusion 9-1 drives the hydraulic tappet 2-2, the control valve 3 is in the intake oil leakage period, and the hydraulic tappet 2-2 compresses the hydraulic oil in the tappet oil chamber 2-4 through the high-pressure oil circuit 4, in turn through the intake control valve sleeve radial oil leakage hole 3-2-1, the control valve core intake radial oil unloading hole 3-3-2, and the low-pressure oil circuit 7 into the accumulator 8-1 of the energy storage system 8, and the intake valve 10 cannot be opened during the intake stroke. After the oil leakage, the oil pressure in the high-pressure oil circuit 4 will be lower than that in the accumulator 8-1, and the oil in the accumulator 8-1 will replenish the high-pressure oil circuit 4 through the high-pressure check valve 4-1.

[0074] At this time, the exhaust valve 6 of some cylinders of the engine opens twice during the intake stroke, and the high-temperature exhaust gas flows back into the cylinder from the exhaust pipe 12 and is discharged from the cylinder during the exhaust stroke, thereby realizing the reflux cylinder stop work of reflux, compression, expansion, and exhaust. Figure 5 Schematic diagram of the cylinder valve lift curve for realizing oil stop and reflux cylinder deactivation when the engine is in cylinder deactivation working mode.

[0075] If the valve mechanism is an overhead camshaft structure, the valve cam can directly drive the hydraulic tappet 2-2 to reciprocate, and can also be used as follows Figure 7 The rocker roller assembly 13 shown drives the hydraulic tappet 2-2 to move; if the valve mechanism is a bottom camshaft structure, the valve cam can be Figure 8 The "tappetizer + push rod" assembly 14 shown drives the hydraulic tappet 2-2 to move.

[0076] Embodiment 2:

[0077] like Figure 1 and Figure 3 As shown, this embodiment provides a valve mechanism and an engine for realizing backflow cylinder deactivation. The difference from Embodiment 1 is that an intake manifold on-off valve 11-1 is used to realize the control of intake air without changing the intake valve mechanism of the original engine. Here, the on-off valve state of the intake manifold on-off valve 11-1 corresponding to different working modes in Embodiment 1 is explained.

[0078] The intake manifold on-off valve 11-1 is arranged in the intake manifold of each cylinder, and the intake valve mechanism is the original engine intake mechanism. When the intake manifold on-off valve 11-1 remains in an open state, the cylinder takes in air normally; when the intake manifold on-off valve 11-1 remains in a closed state, the cylinder does not take in air.

[0079] During operation, the engine crankshaft drives the valve cam to rotate. The movement of the exhaust valve 6 can be controlled by changing the position of the exhaust control valve sleeve 3-1, and the engine cylinder intake can be controlled by changing the opening and closing of the intake manifold on-off valve 11-1, thereby realizing the switching between the normal working mode of the engine and the reflux cylinder deactivation mode.

[0080] (1) When the engine is in the normal working mode, the exhaust part control is consistent with that in Example 1, the intake manifold on-off valve 11-1 is in the open state, and the cylinder intake is normal.

[0081] At this time, the engine performs normal work according to the working mode of intake, compression, power and exhaust. Figure 4 This is a schematic diagram of the valve lift curve during normal engine working mode.

[0082] (2) When the engine is in the recirculation cylinder deactivation mode, the exhaust part control is consistent with that in Example 1, and the intake manifold on-off valve 11-1 in front of the corresponding cylinder is in a closed state, and this part of the cylinder has no fresh intake air.

[0083] At this time, the exhaust valve 6 of the engine opens twice during the intake stroke, and the high-temperature exhaust gas flows back into the cylinder from the exhaust pipe 12, and is discharged from the cylinder during the exhaust stroke, thereby realizing the reflux cylinder stop operation of reflux, compression, expansion, and exhaust. Figure 6 Schematic diagram of the cylinder valve lift curve for realizing oil stop and reflux cylinder deactivation when the engine is in cylinder deactivation working mode.

[0084] In addition, the intake manifold on-off valve can also be Fig. 9 The method shown is arranged in an intake manifold shared by a plurality of cylinders, thereby realizing control over the plurality of cylinders.

[0085] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A valve mechanism for realizing engine reflow cylinder deactivation, characterized in that: include: The valve cam comprises an intake cam and an exhaust cam, wherein the exhaust cam is provided with a main protrusion and a secondary protrusion, the main protrusion is provided in the exhaust stroke of the engine, and the secondary protrusion is provided in the intake stroke of the engine; The hydraulic system is provided with a high-pressure oil circuit, a low-pressure oil circuit, and an energy storage system; A hydraulic tappet component, comprising a hydraulic tappet, a tappet sleeve, a tappet spring and a tappet oil chamber, wherein the hydraulic tappet performs reciprocating linear motion under the action of the cam, the tappet oil chamber is connected to the high-pressure oil circuit, and the hydraulic tappet maintains contact with the driving cam under the action of the tappet spring; The control valve component includes a control valve core and a control valve sleeve. The control valve core is installed in the control valve sleeve and rotates synchronously with the valve cam. The control valve core is provided with a radial oil leakage hole of the control valve core and is connected with the low-pressure oil circuit. The control valve sleeve is driven to rotate by an external mechanism and is provided with a radial oil leakage hole of the control valve and is connected with the high-pressure oil circuit. When the radial oil leakage hole of the control valve sleeve is connected with the radial oil leakage hole of the control valve core, the control valve is in the oil leakage period; when the radial oil leakage hole of the control valve sleeve is staggered with the radial oil leakage hole of the control valve core, the control valve is in the closing period. The hydraulic piston driving component is provided with a hydraulic piston, a hydraulic piston sleeve and a hydraulic piston driving oil chamber. The hydraulic piston is installed in the hydraulic piston sleeve. The hydraulic piston driving oil chamber is connected to the high-pressure oil circuit. The hydraulic piston overcomes the valve spring force under the action of the hydraulic oil pressure to drive the intake and exhaust valves to open.

2. The valve mechanism for realizing engine reflow cylinder deactivation according to claim 1, characterized in that: The control valve sleeve is divided into an intake control valve sleeve and an exhaust control valve sleeve, the control valve core is installed in the intake control valve sleeve and the exhaust control valve sleeve, and the control valve core is provided with an intake valve core radial oil leakage hole and an exhaust valve core radial oil leakage hole; radial oil leakage holes are provided on both the intake control valve sleeve and the exhaust control valve sleeve; the radial oil leakage hole of the intake control valve sleeve matches the rising section of the intake cam protrusion, and the radial oil leakage hole of the exhaust control valve sleeve matches the rising section of the exhaust cam secondary protrusion.

3. The valve mechanism for realizing engine reflow cylinder deactivation according to claim 2, characterized in that: The intake oil leakage period formed by the intake valve sleeve and the control valve core intake radial oil leakage hole is greater than the intake cam protrusion rising section wrap angle, and the exhaust oil leakage period formed by the exhaust valve sleeve and the exhaust valve core radial oil leakage hole is greater than the exhaust cam auxiliary protrusion rising section wrap angle.

4. The valve mechanism for realizing engine reflow cylinder deactivation according to claim 1, characterized in that: The control valve sleeve is provided with an intake radial oil leakage hole and an exhaust radial oil leakage hole, and the control valve core is also provided with an intake radial oil leakage hole and an exhaust radial oil leakage hole.

5. The valve mechanism for realizing engine reflow cylinder deactivation according to claim 1, characterized in that: The hydraulic tappet is a flat hydraulic tappet or a roller hydraulic tappet; the valve cam directly drives the hydraulic tappet; or the valve cam drives the hydraulic tappet to move through a roller rocker arm assembly or a "tappetizer + push rod" assembly; The external driving device of the control valve sleeve is a stepping motor, a DC motor, a rotary electromagnet or a hydraulic swing cylinder; The high-pressure oil circuit is provided with a high-pressure one-way valve; the low-pressure oil circuit is provided with a low-pressure one-way valve and an oil pump; the energy storage system is provided with an accumulator and a relief valve.

6. An engine, characterized in that: The invention comprises a valve mechanism for realizing engine reflow cylinder deactivation as described in any one of claims 1 to 5.

7. A valve mechanism for realizing engine reflow cylinder deactivation, characterized in that: include: An exhaust cam, wherein a main lobe and a secondary lobe are arranged on the exhaust cam, wherein the main lobe is arranged on the exhaust stroke of the engine, and the secondary lobe is arranged on the intake stroke of the engine; The hydraulic system is provided with a high-pressure oil circuit, a low-pressure oil circuit and an energy storage system; A hydraulic tappet component, comprising a hydraulic tappet, a tappet sleeve, a tappet spring and a tappet oil chamber, wherein the hydraulic tappet performs reciprocating linear motion under the action of the cam, the tappet oil chamber is connected to the high-pressure oil circuit, and the hydraulic tappet maintains contact with the driving cam under the action of the tappet spring; An exhaust control valve component, comprising an exhaust control valve core and an exhaust control valve sleeve, wherein the exhaust control valve core is installed in the exhaust control valve sleeve and rotates synchronously with the exhaust cam, the exhaust control valve core is provided with a radial oil leakage hole and is connected with a low-pressure oil circuit; the exhaust control valve sleeve is driven to rotate by an external mechanism and is provided with a radial oil leakage hole, and the radial oil leakage hole of the exhaust valve sleeve is connected with the high-pressure oil circuit; when the radial oil leakage hole of the exhaust valve sleeve is connected with the radial oil leakage hole of the exhaust valve core, the exhaust control valve is in an oil leakage period, and when the radial oil leakage hole of the exhaust valve sleeve is staggered with the radial oil leakage hole of the exhaust valve core, the exhaust control valve is in a closed period; A hydraulic piston driving component, which is provided with a hydraulic piston, a hydraulic piston sleeve and a hydraulic piston driving oil chamber. The hydraulic piston is installed in the hydraulic piston sleeve. The hydraulic piston driving oil chamber is connected to the high-pressure oil circuit. The hydraulic piston overcomes the valve spring force under the action of the hydraulic oil pressure to drive the exhaust valve to open; The intake manifold on-off valve is installed in the intake manifold of each cylinder.

8. The valve mechanism for realizing engine reflow cylinder deactivation according to claim 7, characterized in that: The exhaust oil leakage period formed by the radial oil leakage holes of the exhaust control valve sleeve and the exhaust control valve core is greater than the wrap angle of the rising section of the exhaust cam auxiliary protrusion.

9. The valve mechanism for realizing engine reflow cylinder deactivation according to claim 7, characterized in that: The hydraulic tappet is a flat hydraulic tappet or a roller hydraulic tappet; the exhaust cam directly drives the hydraulic tappet; or the valve cam drives the hydraulic tappet to move through a roller rocker arm assembly or a "tappetizer + push rod" assembly; The external driving device of the control valve sleeve is a stepping motor, a DC motor, a rotary electromagnet or a hydraulic swing cylinder; The high-pressure oil circuit is provided with a high-pressure one-way valve; the low-pressure oil circuit is provided with a low-pressure one-way valve and an oil pump; the energy storage system is provided with an accumulator and a relief valve.

10. An engine, characterized in that: It comprises a valve mechanism for realizing engine reflow cylinder deactivation as described in any one of claims 7-9.

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