CN110700914A - DVVT circulating oil way system and gasoline engine - Google Patents

Abstract

The invention discloses a DVVT circulating oil circuit system and a gasoline engine, comprising a cylinder head and a camshaft cover, the cylinder head is provided with a main oil supply passage, and the main oil supply passage is arranged along the central axis of the cylinder head The camshaft cover is provided with two VVT solenoid valve distribution oil passages and two advance and late oil passages, and the two VVT solenoid valve distribution oil passages are both connected to the main oil supply passage and arranged symmetrically relative to the main oil supply passage , each VVT solenoid valve distribution oil passage is connected to an advance and late oil passage. The invention can not only realize the precise control of the VVT solenoid valve, but also greatly simplifies the layout design and processing difficulty of the front end of the cylinder head, and meets the increasingly compact cylinder head layout requirements.

Description

A DVVT circulating oil circuit system and gasoline engine

technical field

The invention relates to a DVVT circulating oil circuit system, belonging to the technical field of gasoline engines, in particular to a DVVT circulating oil circuit system and an amphibious vehicle of the DVVT circulating oil circuit system.

Background technique

VVT (variable valve timing) is a variable valve timing technology. Its working principle is: the VVT actuator contains two parts, the stator and the rotor. The VVT actuator stator is connected to the crankshaft through a timing chain, and the rotor is fixed to the crankshaft by bolts. The camshaft is connected, and the VVT system pushes the rotor and stator in the VVT actuator to rotate relative to each other through the oil pressure to realize the phase change between the camshaft and the crankshaft. VVT improves the efficiency and power of the engine at different engine speeds by adjusting the opening and closing time of the intake and exhaust valves. Most of the existing engines are only equipped with an intake VVT, but the DVVT technology can simultaneously realize the advance or delay of the opening angle of the intake and exhaust valves to adjust the intake and exhaust volume in real time and change the valve overlap angle to increase the intake charge. And efficiency, better only intake swirl, adjust the maximum cylinder burst pressure and participate in the amount of exhaust gas, and ultimately improve the overall performance of the engine, such as power, economy and so on.

Most of the existing engine VVT systems are arranged on the cylinder head (such as Chinese patents CN203347868 and CN207554206), especially for the DVVT system, the layout and processing design of the front end of the cylinder head will be very difficult, and assembly and sealing problems are prone to occur. If the channel is located on the intake side, the oil pressure build-up and response speed of the exhaust side will be slower than that of the exhaust side, which is not conducive to the precise control of the VVT; or the DVVT system is completely arranged on the cylinder head. The layout is very compact, the machining is difficult, and the small wall thickness everywhere poses a reliability risk. Limited by the layout space, the intake and exhaust VVT battery valves may not be symmetrically arranged along the lateral centerline of the cylinder head, which will affect the consistency of the response speed of the intake and exhaust VVT.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a DVVT circulating oil circuit system and a gasoline engine, which can not only realize the precise control of the VVT solenoid valve, but also greatly simplify the layout design and processing difficulty of the front end of the cylinder head, and meet the requirements of increasingly compact cylinders. Cover layout requirements.

In order to solve the above technical problems, the present invention adopts such a gasoline engine DVVT circulating oil circuit system, which includes a cylinder head and a camshaft cover, the cylinder head is provided with a main oil supply channel, and the main oil supply channel is arranged along the The central axis of the cylinder head is arranged, and the camshaft cover is provided with two VVT solenoid valve distribution oil passages and two advance and late oil passages, and the two VVT solenoid valve distribution oil passages are both communicated with the main oil supply passage and are opposite to each other. The main oil supply channels are arranged symmetrically, and each VVT solenoid valve distribution oil channel is connected to an advance and a late oil channel.

In a preferred embodiment of the present invention, the VVT solenoid valve distribution oil passage includes a VVT solenoid valve installation hole and a valve timing advance and late distribution oil passage, and the VVT solenoid valve installation hole is connected to the main power supply. The oil passages are communicated with each other, and one end of the early and late gas distribution oil passages is communicated with the mounting hole of the VVT solenoid valve, and the other end is communicated with the advanced and late oil passages.

In a preferred embodiment of the present invention, the VVT solenoid valve mounting hole and the gas distribution timing advance and late distribution oil passages are formed by die casting and drilling processes.

In a preferred embodiment of the present invention, the centerline of the cylinder head is collinear with the centerline of the camshaft cover.

The invention also discloses a gasoline engine, which uses the aforementioned gasoline engine DVVT circulating oil circuit system.

The beneficial effects of the present invention are as follows: the present invention has a simple structure and is easy to use. By machining the main oil supply passage on the cylinder head and ensuring that it is arranged along the central axis of the cylinder head, the VVT solenoid valve distribution oil passage is machined on the camshaft cover at the same time. And the advance and late oil passages greatly simplify the layout design and processing difficulty of the front end of the cylinder head, and meet the increasingly compact cylinder head layout requirements. The distribution oil circuit adopts a combination of die-casting and drilling to make the camshaft cover compact; further, the intake and exhaust VVT solenoid valves are arranged symmetrically along the lateral centerline of the camshaft cover to ensure the response speed of the intake and exhaust VVT The VVT battery valve is installed vertically on the camshaft cover, and the oil leaks directly from the end of the battery valve into the oil cavity of the cylinder head. Compared with the side arrangement of the VVT battery valve, the oil drain path is smoother and less likely to be blocked.

Description of drawings

Fig. 1 is the schematic diagram of a kind of DVVT circulating oil circuit system of the present invention;

Fig. 2 is the oil supply principle diagram of a kind of DVVT circulating oil circuit system of the present invention;

Fig. 3 is the oil drain principle diagram of a kind of DVVT circulating oil circuit system of the present invention;

Fig. 4 is the structural schematic diagram of the distribution oil circuit in the camshaft cover of the gasoline engine of the present invention;

Fig. 5 is the arrangement diagram of the camshaft cover of a kind of gasoline engine of the present invention;

Fig. 6 is the schematic diagram of a kind of gasoline engine of the present invention;

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The invention discloses a DVVT circulating oil circuit system, comprising a cylinder cover and a camshaft cover. The cylinder cover is provided with a main oil supply channel, the main oil supply channel is arranged along the central axis of the cylinder cover, and two VVTs are arranged on the camshaft cover. Solenoid valve distribution oil passage and two advance and late oil passages, two VVT solenoid valve distribution oil passages are connected with the main oil supply passage and are arranged symmetrically with respect to the main oil supply passage, each VVT solenoid valve distribution oil passage is connected to an advance oil passage and late oil passages. The VVT solenoid valve distribution oil passage includes the VVT solenoid valve installation hole and the valve timing advance and late distribution oil passages. The VVT solenoid valve installation hole is connected to the main oil supply passage, and one end of the valve timing advance and late distribution oil passage is connected to The VVT solenoid valve is connected to the mounting hole, and the other end is connected to the advance and late oil passages. VVT solenoid valve installation holes and valve timing advance and late distribution oil passages are formed by die casting and drilling process. The centerline of the cylinder head is collinear with the centerline of the camshaft cover.

Specifically, as shown in FIG. 1 , the present invention specifically relates to a DVVT circulating oil circuit system of a gasoline engine; the DVVT circulating oil circuit system includes: 1. a main oil supply channel 1 arranged on the cylinder head; 2. in the camshaft cover The VVT solenoid valve distributes oil passages 2; 3. The valve timing in the camshaft and the VVT actuator is advanced and retarded. The oil passages 3-1, 3-2 and 4-1, 4-2.

As shown in Figures 2 and 3, when the engine is running under variable working conditions, the main oil passage oil passes through the main oil supply passage 1 on the cylinder head and enters the VVT solenoid valve in the camshaft cover to distribute the oil passage 2. The ECU instructs to realize the opening and closing of the oil passages in advance or late in the valve timing. The intake side passes through the VVT solenoid valve mounting hole 2-1, and the valve timing is distributed in oil passages 2-5 in advance or late in oil passages 2-6. , respectively enter the intake camshaft and the valve timing in the VVT actuator to advance or delay oil passages 3-1 and 4-1; the exhaust side passes through the VVT solenoid valve mounting hole 2-2, and the valve timing is distributed in advance The oil passages 2-3 or 2-4 are distributed later, and the valve timings enter the exhaust camshaft and the VVT actuator to advance or lag the oil passages 3-2 and 4-2 respectively. The standby oil fills the valve timing advance chamber or late chamber, and pushes the rotor of the VVT actuator on the intake side to rotate, so that the phase between the camshaft and the crankshaft can be continuously variable; when the engine switches operating conditions, the VVT actuator The rotor will discharge the oil in the valve timing advance chamber or the late chamber according to the command of the ECU, and return the value VVT along the timing advance oil passages 3-1, 4-1 or late oil passages 3-2 and 4-2. 2-1 and 2-2 in the solenoid valve, and discharged through the oil drain hole at the tail end of the VVT solenoid valve, and finally in the oil cavity of the cylinder head to realize the oil circulation. As shown in Figure 4, the VVT solenoid valve distribution oil passages 2-5, 2-6 and the VVT solenoid valve mounting hole 2-1 are arranged on the camshaft cover 2, which greatly simplifies the layout design and processing difficulty of the front end of the cylinder head. Meet the increasingly compact cylinder head layout requirements; the distribution oil circuits 2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 are processed by a combination of die-casting and drilling to make the camshaft cover 2 The layout is compact. As shown in Figures 5 and 6, the intake and exhaust VVT solenoid valves 3-1 and 3-2 are symmetrically arranged along the center line of the camshaft cover 2 to ensure the consistency of the response speed of the intake and exhaust VVT. The VVT solenoid valves 3-1 and 3-2 are vertically installed on the camshaft cover 2, and the oil is directly drained from the rear end of the battery valve into the cylinder head oil 2 cavity. Compared with the side-mounted arrangement of the VVT battery valve, the oil drain is more Unobstructed, not easy to block.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered. within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

Claims (5)

1. A DVVT circulating oil circuit system, comprising a cylinder head and a camshaft cover, characterized in that: the cylinder head is provided with a main oil supply passage, and the main oil supply passage is arranged along the central axis of the cylinder head, so The camshaft cover is provided with two VVT solenoid valve distribution oil passages and two advance and late oil passages. The two VVT solenoid valve distribution oil passages are both connected to the main oil supply passage and arranged symmetrically with respect to the main oil supply passage. A VVT solenoid valve distribution oil passage is connected to an advance and a late oil passage. 2. The DVVT oil circulation system according to claim 1, characterized in that: the VVT solenoid valve distribution oil passage comprises a VVT solenoid valve mounting hole and a valve timing advance and late distribution oil passage, and the VVT solenoid The valve mounting hole is communicated with the main oil supply passage, one end of the advance and late distribution oil passage is communicated with the VVT solenoid valve mounting hole, and the other end is communicated with the advance and late oil passages. 3 . The DVVT oil circulation system according to claim 2 , wherein the VVT solenoid valve installation hole and the gas distribution timing advance and late distribution oil passages are formed by die casting and drilling process. 4 . 4 . The DVVT oil circulation system according to claim 1 , wherein the center line of the cylinder head and the center line of the camshaft cover are collinear. 5 . 5. A gasoline engine, characterized in that: it uses the gasoline engine DVVT cycle oil circuit system according to any one of claims 1-4.

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