A composite oil rail and variable valve system

Abstract

The present invention relates to a composite oil rail and variable valve system. The present invention comprises a rail body; a high-pressure oil circuit, comprising a high-pressure oil chamber disposed within the rail body, and a high-pressure oil inlet and a plurality of high-pressure oil outlets, each disposed on the rail body and connected to the high-pressure oil chamber; and a low-pressure oil circuit, comprising a low-pressure oil chamber disposed within the rail body, and a low-pressure oil inlet and a plurality of low-pressure oil outlets, each disposed on the rail body and connected to the low-pressure oil chamber, wherein the high-pressure oil chamber and the low-pressure oil chamber are isolated from each other. By integrating the high-pressure oil circuit and the low-pressure oil circuit, independent control of the two oil passages is achieved, the flexibility and accuracy of the fuel supply are improved, the complexity of the system is reduced, the performance and reliability of the engine are improved, and the requirements for compactness and lightweighting of the engine are met.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel rails, and in particular to a composite fuel rail and a variable valve system. Background Art

[0002] Currently, engines have multiple fuel rails, each requiring separate designs, making installation difficult and heavy. Since different fuel rails require different mounting locations and pivot points, additional engineering is required, increasing the complexity of engine design and manufacturing. Furthermore, the use of multiple independent fuel rails increases the overall weight of the system. Furthermore, traditional engine fuel supply systems often require separate high-pressure and low-pressure circuits, resulting in a complex system structure and a large number of components. This increases the system's weight, makes installation and maintenance more difficult, and increases the overall engine mass, hindering compact and lightweight designs. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a composite fuel rail and variable valve system. By integrating the high-pressure oil circuit and the low-pressure oil circuit, independent control of the two oil channels is achieved, the flexibility and accuracy of the fuel supply are improved, the complexity of the system is reduced, the performance and reliability of the engine are improved, and the requirements of compactness and lightweight of the engine are met.

[0004] In order to solve the above technical problems, the present invention provides a composite fuel rail, comprising:

[0005] Track body;

[0006] a high-pressure oil circuit, comprising a high-pressure oil chamber provided inside the rail body, and a high-pressure oil inlet and a plurality of high-pressure oil outlets respectively provided on the rail body and communicating with the high-pressure oil chamber;

[0007] The low-pressure oil circuit includes a low-pressure oil chamber provided inside the rail body, and a low-pressure oil inlet and a plurality of low-pressure oil outlets respectively provided on the rail body and communicating with the low-pressure oil chamber.

[0008] Wherein, the high-pressure oil chamber and the low-pressure oil chamber are isolated from each other.

[0009] In one embodiment of the present invention, a cylinder cover is further included, and a plurality of mounting seats extend from both side ends of the rail body respectively, and the rail body is connected to the cylinder cover via the plurality of mounting seats.

[0010] In one embodiment of the present invention, a rail pressure sensor for monitoring the pressure in the rail is provided on each of the high-pressure oil circuit and the low-pressure oil circuit.

[0011] The present invention also provides a variable valve system for the composite fuel rail, comprising:

[0012] a low-pressure oil boosting system connected to the composite oil rail, for providing low-pressure oil of a predetermined pressure to the composite oil rail;

[0013] a high-pressure oil boosting system connected to the composite oil rail, for providing high-pressure oil of a predetermined pressure to the composite oil rail;

[0014] The hydraulic drive system connected to the composite oil rail includes a valve body and a low-pressure oil channel, a high-pressure oil channel, a high-pressure oil chamber, a control component and a reversing component respectively arranged in the valve body; wherein:

[0015] The low-pressure oil passage is in communication with the low-pressure oil circuit;

[0016] The high-pressure oil passage is in communication with the high-pressure oil circuit;

[0017] The high-pressure oil passage can be connected and disconnected with the high-pressure oil chamber through the reversing assembly;

[0018] The control component is used to open or close the low-pressure oil passage, and can allow low-pressure oil to enter the low-pressure oil passage when opened;

[0019] The reversing assembly can open the high-pressure oil passage through the low-pressure oil entering the low-pressure oil passage, so that the high-pressure oil enters the high-pressure oil chamber through the high-pressure oil passage;

[0020] The high-pressure oil chamber can push the valve to open through its oil pressure.

[0021] In one embodiment of the present invention, the low-pressure oil boosting system includes a low-pressure oil tank, a first filter, an electric pump and the low-pressure oil inlet connected in sequence, and a low-pressure oil overflow valve arranged on the low-pressure oil circuit is installed on the rail body, and the low-pressure oil tank is connected to the low-pressure oil circuit through the low-pressure oil overflow valve.

[0022] In one embodiment of the present invention, the high-pressure oil boosting system includes a high-pressure oil tank, a second filter, a high-pressure pump and the high-pressure oil inlet connected in sequence, and a high-pressure pressure limiting valve arranged on the high-pressure oil circuit is installed on the rail body, and the high-pressure oil tank is connected to the high-pressure oil circuit through the high-pressure pressure limiting valve.

[0023] In one embodiment of the present invention, the low-pressure oil outlet is communicated with the low-pressure oil channel, the high-pressure oil outlet is communicated with the high-pressure oil channel, and a check valve is provided at the joint of the high-pressure oil outlet.

[0024] In one embodiment of the present invention, the control component includes an electromagnet, a return spring, an adjustment pad and a control valve core; a first valve core chamber is provided in the valve body, and the control valve core is slidably connected to the first valve core chamber, and the low-pressure oil channel includes a first section of low-pressure oil channel and a second section of low-pressure oil channel connected to the first valve core chamber. The first section of low-pressure oil channel and the second section of low-pressure oil channel can be connected or disconnected by sliding the control valve core in the first valve core chamber. The control valve core is connected to the adjustment pad, and the electromagnet is provided on the outside of the valve body and facing the adjustment pad. One end of the control valve core passes through the adjustment pad and is connected to the groove provided on the electromagnet through the return spring.

[0025] In one embodiment of the present invention, the reversing assembly includes a reversing valve core and a reversing spring. A second valve core chamber connected to the second section of the low-pressure oil channel is provided in the valve body. The second valve core chamber is respectively connected to the high-pressure oil chamber and the high-pressure oil channel. The reversing valve core is slidably connected to the second valve core chamber through the reversing spring. The low-pressure oil can push the reversing valve core to slide through the second section of the low-pressure oil channel. The high-pressure oil chamber and the high-pressure oil channel can be connected or disconnected by sliding the reversing valve core in the second valve core chamber. A valve is provided on one side of the high-pressure oil chamber.

[0026] In one embodiment of the present invention, the valve body is further provided with a high-pressure oil return hole communicating with the second valve core cavity.

[0027] The above technical solution of the present invention has the following advantages over the prior art:

[0028] The composite fuel rail of the present invention can realize independent control of two fuel channels, so that the engine can select different fuel supply modes under different working conditions, thereby improving fuel utilization efficiency, reducing energy consumption and reducing emissions.

[0029] The composite fuel rail of the present invention can adapt to a variety of fuels, such as engine oil, diesel, natural gas, methanol, ethanol, etc., and has high adaptability. At the same time, the pressure of the composite fuel rail is not limited and can be adjusted according to actual needs to meet the requirements of different engines.

[0030] The composite oil rail of the present invention adopts an electromagnet to control the sliding of the valve core, thereby achieving precise control of the low-pressure oil circuit and the high-pressure oil circuit, thereby improving the accuracy of fuel supply and improving the performance of the engine.

[0031] The composite oil rail of the present invention integrates the high-pressure oil circuit and the low-pressure oil circuit into one rail body, thereby reducing the number of components, lowering the complexity of the system, making the entire system structure more compact, and facilitating installation and maintenance.

[0032] The composite oil rail of the present invention adopts protective measures such as a high-pressure pressure-limiting valve and a filter to ensure the cleanliness and stability of the oil circuit, thereby improving the reliability and service life of the system.

[0033] The present invention integrates the high-pressure oil circuit and the low-pressure oil circuit to achieve independent control of the two oil channels, thereby improving the flexibility and accuracy of fuel supply, reducing system complexity, improving engine performance and reliability, and meeting the requirements of engine compactness and lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0035] Figure 1 It is a schematic diagram of the composite oil rail structure of the present invention.

[0036] Figure 2 It is a schematic diagram of the composite side structure of the present invention.

[0037] Figure 3 It is a schematic structural diagram of the variable valve system of the present invention.

[0038] Description of the accompanying drawings:

[0039] 1. Low-pressure oil tank; 2. First filter; 3. Electric pump; 4. Composite fuel rail; 5a7. Low-pressure oil overflow valve; 6. High-pressure oil tank; 7. Second filter; 8. High-pressure pump; 9a4. High-pressure pressure-limiting valve; 10. Check valve; 11. Reversing spring; 12. Valve body; 13. Reversing valve core; 14. Control valve core; 15. Return spring; 16. Solenoid; 17. Adjusting pad; 18. High-pressure oil return hole; C01. Low-pressure oil channel; C02. High-pressure oil channel; C03. High-pressure oil chamber.

[0040] A. Low-pressure oil boosting system; B. High-pressure oil boosting system; C. Hydraulic drive system; D. Composite oil rail system;

[0041] a1, high-pressure oil chamber; a2, low-pressure oil chamber; a3, high-pressure oil inlet; a5, cylinder head; a6, low-pressure oil inlet; a8, mounting seat; a9, high-pressure oil outlet; a10, low-pressure oil outlet; a11, rail body. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0043] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0044] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0045] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0046] Reference Figure 1 、 Figure 2 As shown, a composite oil rail 4 includes:

[0047] Track body a11;

[0048] The high-pressure oil circuit includes a high-pressure oil chamber a1 provided inside the rail body a11 and a high-pressure oil inlet a3 and a plurality of high-pressure oil outlets a9 respectively provided on the rail body a11 and communicating with the high-pressure oil chamber a1;

[0049] The low-pressure oil circuit includes a low-pressure oil chamber a2 provided inside the rail body a11, and a low-pressure oil inlet a6 and a plurality of low-pressure oil outlets a10 provided on the rail body a11 and communicating with the low-pressure oil chamber a2.

[0050] The high-pressure oil chamber a1 and the low-pressure oil chamber a2 are isolated from each other.

[0051] Specifically, it also includes a cylinder cover a5, and a plurality of mounting seats a8 are respectively extended from both side ends of the rail body a11, and the rail body a11 is connected to the cylinder cover a5 through the plurality of mounting seats a8.

[0052] Specifically, the high-pressure oil circuit and the low-pressure oil circuit are respectively provided with rail pressure sensors for monitoring the pressure in the rail.

[0053] The composite fuel rail 4 of this embodiment can be processed in any manner and may be machined, welded, forged, or otherwise. The two fuel channels of the composite fuel rail 4 can be used to transport any medium, including engine oil, diesel, natural gas, methanol, ethanol, and the like. Furthermore, the pressure of the two channels is not limited.

[0054] Reference Figure 3 As shown, this embodiment also provides a variable valve system of the composite fuel rail 4, including:

[0055] A low-pressure oil boosting system A connected to the composite oil rail 4, for providing low-pressure oil of a predetermined pressure to the composite oil rail 4;

[0056] A high-pressure oil boosting system B connected to the composite oil rail 4, for providing high-pressure oil of a predetermined pressure to the composite oil rail 4;

[0057] The hydraulic drive system C connected to the composite oil rail 4 includes a valve body 12 and a low-pressure oil channel C01, a high-pressure oil channel C02, a high-pressure oil chamber C03, a control component, and a reversing component respectively provided in the valve body 12; wherein:

[0058] The low-pressure oil passage C01 is in communication with the low-pressure oil circuit;

[0059] The high-pressure oil passage C02 is in communication with the high-pressure oil circuit;

[0060] The high-pressure oil channel C02 can be connected and disconnected with the high-pressure oil chamber C03 through the reversing component;

[0061] The control component is used to open or close the low-pressure oil passage C01, and can allow low-pressure oil to enter the low-pressure oil passage C01 when opened;

[0062] The reversing assembly can open the high-pressure oil passage C02 through the low-pressure oil entering the low-pressure oil passage C01, so that the high-pressure oil enters the high-pressure oil chamber C03 through the high-pressure oil passage C02;

[0063] The high-pressure oil chamber C03 can push the valve to open through its oil pressure.

[0064] Through the above arrangement, the low-pressure oil boosting system A is used to provide low-pressure oil at a certain pressure, the high-pressure oil boosting system B is used to provide high-pressure oil at a certain pressure, the hydraulic drive system C is used to control the on and off of the high-pressure oil to achieve the establishment and release of pressure in the high-pressure oil chamber C03, and the composite oil rail system D is used to store low-pressure oil of appropriate pressure and provide it to the low-pressure oil channel C01 of the hydraulic drive system C, as well as to store high-pressure oil of appropriate pressure and provide it to the high-pressure oil channel C02 of the hydraulic drive system C.

[0065] Specifically, the low-pressure oil boosting system A includes a low-pressure oil tank 1, a first filter 2, an electric pump 3 and the low-pressure oil inlet a6 connected in sequence. A low-pressure oil overflow valve a7 arranged on the low-pressure oil circuit is installed on the rail body a11, and the low-pressure oil tank 1 is connected to the low-pressure oil circuit through the low-pressure oil overflow valve a7.

[0066] Specifically, the high-pressure oil boosting system B includes a high-pressure oil tank 6, a second filter 7, a high-pressure pump 8 and the high-pressure oil inlet a3 connected in sequence. A high-pressure pressure-limiting valve a4 arranged on the high-pressure oil circuit is installed on the rail body a11, and the high-pressure oil tank 6 is connected to the high-pressure oil circuit through the high-pressure pressure-limiting valve a4.

[0067] Specifically, the low-pressure oil outlet a10 communicates with the low-pressure oil passage C01, and the high-pressure oil outlet a9 communicates with the high-pressure oil passage C02. A check valve 10 is installed at the connection of the high-pressure oil outlet a9 to prevent rear-end pressure fluctuations from being transmitted to the rail end. Low-pressure oil outlet a10 lacks a check valve because the operation here is relatively simple, with a single influencing factor, resulting in minimal pressure fluctuations. Adding a check valve would increase costs. High pressure, however, drives valve operation, resulting in significant pressure fluctuations due to the influence of in-cylinder back pressure, valve spring force, clearance between the valve and the high-pressure oil passage C03, and in-cylinder combustion conditions. Therefore, adding a check valve 10 to the high-pressure oil outlet a9 helps stabilize the pressure within the high-pressure oil chamber and prevent pressure transmission from affecting the normal operation of other cylinders.

[0068] Specifically, the control component includes an electromagnet 16, a return spring 15, an adjustment pad 17 and a control valve core 14; a first valve core cavity is provided in the valve body 12, and the control valve core 14 is slidably connected to the first valve core cavity. The low-pressure oil channel C01 includes a first section of low-pressure oil channel and a second section of low-pressure oil channel that are connected to the first valve core cavity. The first section of low-pressure oil channel and the second section of low-pressure oil channel can be connected or disconnected by sliding the control valve core 14 in the first valve core cavity. The control valve core 14 is connected to the adjustment pad 17. The electromagnet 16 is provided on the outside of the valve body 12 and facing the adjustment pad 17. One end of the control valve core 14 passes through the adjustment pad 17 and is connected to the groove provided on the electromagnet 16 through the return spring 15.

[0069] Specifically, the reversing assembly includes a reversing valve core 13 and a reversing spring 11. A second valve core chamber connected to the second section of the low-pressure oil channel is provided in the valve body 12. The second valve core chamber is respectively connected to the high-pressure oil chamber C03 and the high-pressure oil channel C02. The reversing valve core 13 is slidably connected to the second valve core chamber through the reversing spring 11. The low-pressure oil can push the reversing valve core 13 to slide through the second section of the low-pressure oil channel. The reversing valve core 13 slides in the second valve core chamber to connect or disconnect the high-pressure oil chamber C03 and the high-pressure oil channel C02. A valve is provided on one side of the high-pressure oil chamber C03.

[0070] Specifically, the valve body 12 is further provided with a high-pressure oil return hole 18 communicating with the second valve core cavity.

[0071] Working principle of the present invention:

[0072] Power-on process: At this time, the electromagnet 16 is energized, and the control valve core 14 is pulled to the extreme left by the electromagnetic force. The low-pressure oil channel C01 opens, and the low-pressure oil flows out from the low-pressure oil chamber a2, through the oil pipe to the low-pressure oil channel C01. The low-pressure oil pushes the reversing valve core 13 to overcome the spring force of the reversing spring 11, and the reversing valve core 13 is pushed to the extreme right. The high-pressure oil channel is opened, and the high-pressure oil chamber C03 is open, and the oil pressure built up by it pushes the valve to open;

[0073] Power-off process: At this time, the electromagnet 16 is de-energized, and the control valve core 14 returns to its position under the action of the return spring 15. The control valve core 14 moves to the right to fit with the valve body 12. At this time, the low-pressure oil channel C01 is closed, and the low-pressure oil on the left side of the reversing valve core 13 is directly connected to the atmospheric pressure. The pressure is released until zero. The reversing valve core 13 is reset to the far left under the action of the reversing spring 11. At this time, the high-pressure oil channel C02 is closed, and the oil in the high-pressure oil chamber C03 is discharged through the high-pressure oil return hole 18. At this time, the valve is closed under the action of the spring force and the pressure in the cylinder.

[0074] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A variable valve system, characterized in that: include: A composite oil rail (4), comprising: Track body (a11); A high-pressure oil circuit, comprising a high-pressure oil chamber (a1) disposed inside the rail body (a11), and a high-pressure oil inlet (a3) ​​and a plurality of high-pressure oil outlets (a9) respectively disposed on the rail body (a11) and communicating with the high-pressure oil chamber (a1); The low-pressure oil circuit includes a low-pressure oil chamber (a2) provided inside the rail body (a11), and a low-pressure oil inlet (a6) and a plurality of low-pressure oil outlets (a10) respectively provided on the rail body (a11) and communicating with the low-pressure oil chamber (a2). wherein the high-pressure oil chamber (a1) and the low-pressure oil chamber (a2) are isolated from each other; A low-pressure oil boosting system (A) connected to the composite oil rail (4), for providing low-pressure oil of a predetermined pressure to the composite oil rail (4); a high-pressure oil boosting system (B) connected to the composite oil rail (4), for providing high-pressure oil of a predetermined pressure to the composite oil rail (4); A hydraulic drive system (C) connected to the composite oil rail (4) comprises a valve body (12) and a low-pressure oil passage (C01), a high-pressure oil passage (C02), a high-pressure oil chamber (C03), a control component and a reversing component respectively arranged in the valve body (12); wherein: The low-pressure oil passage (C01) is in communication with the low-pressure oil circuit; The high-pressure oil passage (C02) is in communication with the high-pressure oil circuit; The high-pressure oil passage (C02) can be connected and disconnected with the high-pressure oil chamber (C03) through the reversing assembly; The control component is used to open or close the low-pressure oil passage (C01), and can allow low-pressure oil to enter the low-pressure oil passage (C01) when opened; The reversing assembly is capable of opening the high-pressure oil passage (C02) through the low-pressure oil entering the low-pressure oil passage (C01), so that the high-pressure oil enters the high-pressure oil chamber (C03) through the high-pressure oil passage (C02); The high-pressure oil chamber (C03) can push the valve to open through its oil pressure; The control assembly includes an electromagnet (16), a return spring (15), an adjustment pad (17) and a control valve core (14); a first valve core cavity is provided in the valve body (12), the control valve core (14) is slidably connected to the first valve core cavity, the low-pressure oil passage (C01) includes a first section of low-pressure oil passage and a second section of low-pressure oil passage communicated with the first valve core cavity, and the first section of low-pressure oil passage and the second section of low-pressure oil passage can be connected or disconnected by sliding the control valve core (14) in the first valve core cavity, the control valve core (14) is connected to the adjustment pad (17), the electromagnet (16) is provided on the outside of the valve body (12) and directly facing the adjustment pad (17), one end of the control valve core (14) passes through the adjustment pad (17) and is connected to the groove provided on the electromagnet (16) through the return spring (15); The reversing assembly includes a reversing valve core (13) and a reversing spring (11); a second valve core chamber connected to the second section of the low-pressure oil channel is provided in the valve body (12); the second valve core chamber is respectively connected to the high-pressure oil chamber (C03) and the high-pressure oil channel (C02); the reversing valve core (13) is slidably connected to the second valve core chamber through the reversing spring (11); the low-pressure oil can push the reversing valve core (13) to slide through the second section of the low-pressure oil channel; the high-pressure oil chamber (C03) and the high-pressure oil channel (C02) can be connected or disconnected by the reversing valve core (13) sliding in the second valve core chamber; a valve is provided on one side of the high-pressure oil chamber (C03).

2. The variable valve system according to claim 1, characterized in that: The low-pressure oil boosting system (A) comprises a low-pressure oil tank (1), a first filter (2), an electric pump (3) and the low-pressure oil inlet (a6) which are connected in sequence. A low-pressure oil overflow valve (5, a7) arranged on the low-pressure oil circuit is installed on the rail body (a11). The low-pressure oil tank (1) is connected to the low-pressure oil circuit via the low-pressure oil overflow valve (5, a7).

3. The variable valve system according to claim 1, characterized in that: The high-pressure oil boosting system (B) comprises a high-pressure oil tank (6), a second filter (7), a high-pressure pump (8), and the high-pressure oil inlet (a3) ​​connected in sequence; a high-pressure pressure-limiting valve (9, a4) arranged on the high-pressure oil circuit is installed on the rail body (a11); the high-pressure oil tank (6) is connected to the high-pressure oil circuit via the high-pressure pressure-limiting valve (9, a4).

4. The variable valve system according to claim 1, characterized in that: The low-pressure oil outlet (a10) is in communication with the low-pressure oil passage (C01), the high-pressure oil outlet (a9) is in communication with the high-pressure oil passage (C02), and a check valve (10) is provided at the joint of the high-pressure oil outlet (a9).

5. The variable valve system according to claim 1, characterized in that: It also includes a cylinder cover (a5), and a plurality of mounting seats (a8) are respectively extended from both side ends of the rail body (a11), and the rail body (a11) is connected to the cylinder cover (a5) through the plurality of mounting seats (a8).

6. The variable valve system according to claim 1, characterized in that: The high-pressure oil circuit and the low-pressure oil circuit are respectively provided with rail pressure sensors for monitoring the pressure in the rail.

7. The variable valve system according to claim 1, characterized in that: The valve body (12) is also provided with a high-pressure oil return hole (18) communicating with the second valve core cavity.

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