Rocker arm mechanism and engine assembly
A technology of rocker mechanism and rocker shaft, which is applied in the direction of machines/engines, engine components, mechanical equipment, etc., can solve the problem of unable to set the exhaust rocker arm, and achieve the effect of avoiding valve ablation
Active Publication Date: 2020-12-11
WEICHAI POWER CO LTD
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Problems solved by technology
[0004] The object of the present invention is to provide a rocker arm mechanism and an engine assembly to solve the problem in the related art that it is often impossible to install a hydraulic gap adjustment device on the exhaust rocker arm to compensate the gap after the engine braking mechanism is adopted.
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[0036] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...
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The invention relates to the technical field of engines, and particularly discloses a rocker arm mechanism and an engine assembly. The rocker arm mechanism comprises a rocker arm shaft, a rocker arm,a valve clearance adjusting device, a valve mechanism and a control valve, wherein the rocker arm is arranged on the rocker arm shaft in a rotating mode, the valve mechanism comprises a valve bridge,a plunger cavity is arranged on the rocker arm, the valve clearance adjusting device comprises a hydraulic tappet arranged in the plunger cavity in a sliding mode, the plunger cavity supplies oil through an oil supply way, the control valve can open or close the oil supply way, when the control valve opens the oil supply way, the hydraulic tappet can abut against a valve bridge, a gap between thevalve bridge and the hydraulic tappet is eliminated, when the control valve closes the oil supply way, the relative positions of the hydraulic tappet and the rocker arm are kept unchanged, and if an engine brakes, oil filling of the plunger cavity cannot be caused so that compatibility of compression release braking and a hydraulic gap adjusting device can be realized, and valve ablation or valvepiston collision caused can be avoided after the engine brakes are removed.
Description
technical field [0001] The invention relates to the technical field of engines, in particular to a rocker mechanism and an engine assembly. Background technique [0002] Large vehicles driven by heavy-duty or medium-sized diesel engines are usually equipped with an engine braking mechanism. When the engine brakes, the brake piston of the brake rocker arm is stretched out under the drive of brake oil and cooperates with the valve bridge, resulting in the valve bridge Tilting, there will be a large gap between the exhaust rocker arm elephant foot and the valve bridge, and the exhaust valve cannot be closed, which can release the compressed air in the cylinder and cannot do work outside. [0003] However, in the prior art, after the engine braking mechanism is adopted, it is often impossible to arrange a hydraulic clearance adjusting device on the exhaust rocker arm to compensate the clearance. The hydraulic clearance adjustment device is a hydraulic tappet for automatic adjus...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01L1/245F01L13/06F01L1/18F01L1/26
CPCF01L1/245F01L13/06F01L1/181F01L1/26F01L2001/2444F01L13/065F01L2013/105F01L2305/00F01L1/267F01L1/2411
Inventor 郭圣刚王飞许成
Owner WEICHAI POWER CO LTD