Two-stage hydraulic tappet, two-stage variable valve lift mechanism and control method thereof
A technology of hydraulic tappet and valve lift, applied in lift valve, mechanical equipment, engine components, etc., can solve the problems of not considering control methods, single applicable working conditions, large impact of moving pins, etc., to improve idle speed stability, The effect of increasing the oil supply volume and reducing the impact
Active Publication Date: 2022-08-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
This can lead to situations where the moving pin gets stuck or fails due to fatigue or if the spring fails, preventing the spring from unlocking
[0006] 2. In the two-stage hydraulic tappet, the oil supply head of the moving pin adopts a flat head design, which has poor smoothness when switching, and the impact is relatively large when locking, and the impact on the moving pin is relatively large when unlocking and returning
[0007] 3. The similar technology can only complete the simple switching of the lift, without considering the control method to adapt to different working conditions, and the applicable working condition is single
[0008] This shows that the above-mentioned existing two-stage hydraulic tappet, two-stage variable valve lift mechanism and control method thereof obviously still have inconvenience and defects, and need to be further improved urgently
Method used
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[0036] This embodiment provides a two-stage variable valve lift mechanism, which cooperates with figure 1 As shown, it includes a two-stage hydraulic tappet 1 and a two-stage camshaft 2, which cooperate and control the lift of the valve 3 under the control of the oil circuit system; among them, the high cam 21 on the two-stage camshaft 2 It is in direct contact with the outer tappet 11 ; the low cam 22 on the two-stage camshaft 2 is in direct contact with the inner tappet 12 .
[0037] Cooperate figure 2 As shown, in one embodiment of the present invention, in order to realize two valve lift functions, the two-stage hydraulic tappet includes an outer tappet 11, an inner tappet 12, a moving pin (the inner tappet moving pin 13 and the outer tappet 12). Post moving pin 14); the inner tappet 12 is placed inside the outer tappet 11; the outer tappet 11 and the inner tappet 12 realize locking linkage or unlocking separation through the movement of the moving pin, and a moving pin ...
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The invention discloses a two-segment hydraulic tappet and a two-segment variable valve lift mechanism including the same. The tappet, the inner tappet, and the moving pin; the inner tappet is placed inside the outer tappet, and the outer tappet and the inner tappet realize locking linkage or unlocking separation through the movement of the moving pin, and a moving pin is arranged on the outer tappet to lock The oil passage and the moving pin unlock the oil passage, and the two oil passages are respectively connected to two ends of the moving pin. The invention adopts the double oil channel design of locking oil channel and unlocking oil channel, so that the working mode of the moving pin becomes the oil pressure locking and the oil channel reversing unlocking mode, which has the advantages of quick unlocking and high reliability. The invention also discloses a control method of a two-stage variable valve lift mechanism. The method controls the mechanism based on the engine speed, the oil temperature of the oil supply, and the oil pressure, and can adapt to a variety of different working conditions. High-performance control can be achieved under different working conditions.
Description
technical field [0001] The invention relates to the technical field of engine power and hydraulic pressure, in particular to a two-stage hydraulic tappet, a two-stage variable valve lift mechanism and a control method thereof. Background technique [0002] The valve train is one of the main components of the engine. Its main function is to open and close the intake and exhaust valves of each cylinder regularly according to the working sequence of the engine and the requirements of the working cycle, so that the fresh air can smoothly enter the cylinder and the exhaust gas can be timely. Expel the cylinder. The valve timing and valve lift of the traditional valve train are fixed, which can only ensure the best performance of the engine under a certain working condition, and it is difficult to take into account the requirements of valve timing and valve lift under all working conditions. Therefore, the variable valve phasing technology is widely used because of its high cost ...
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IPC IPC(8): F01L13/00F01L3/24F01L1/245F01L1/047
CPCF01L13/0031F01L1/245F01L1/047F01L3/24
Inventor 刘波澜王文泰韩耀辉张俊玮刘凡硕
Owner BEIJING INSTITUTE OF TECHNOLOGYGY