US 11,988,116 B2
Combined valve actuating devices with specialized actuating cams for hydraulic lash self-adjustment
Lap Lam Chui, Changzhou (CN)
Assigned to JIANGSU JOINTEK PRECISION MACHINERY CO., LTD., Changzhou (CN)
Filed by JIANGSU JOINTEK PRECISION MACHINERY CO., LTD., Jiangsu (CN)
Filed on Oct. 12, 2023, as Appl. No. 18/485,877.
Application 18/485,877 is a continuation in part of application No. PCT/CN2022/089486, filed on Apr. 27, 2022.
Claims priority of application No. 202210084721.X (CN), filed on Jan. 25, 2022.
Prior Publication US 2024/0052762 A1, Feb. 15, 2024
Int. Cl. F01L 1/24 (2006.01); F01L 1/18 (2006.01)
CPC F01L 1/24 (2013.01) [F01L 1/181 (2013.01); F01L 1/2411 (2013.01); F01L 2001/2444 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A combined valve actuating device with a specialized actuating cam for hydraulic lash self-adjustment, comprising:
an actuator, the actuator having a primary piston slidably mounted in a primary piston hole, an actuating piston slidably mounted in an actuating piston hole, and an actuating oil line connected between the primary piston hole and the actuating piston hole, an inner oil line connected to the actuating piston hole running through the actuating piston, and the actuator being fixedly mounted on a rocker arm shaft;
a rocker arm, the rocker arm being mounted with a hydraulic lash adjuster, and the rocker arm being rotationally mounted on the rocker arm shaft;
the specialized actuating cam, the specialized actuating cam being disposed on one side of a positivity cam of an engine and having a round base component and an actuating lift boss disposed on the round base component;
a valve bridge located below the actuating piston and the hydraulic lash adjuster, the valve bridge having a secondary piston slidably mounted in a secondary piston hole and an oil drain line connected to the secondary piston hole and an actuating valve being connected to the secondary piston, the actuating piston being disposed opposite to the valve bridge, wherein an effective area of action of the actuating piston for being pushed by a liquid in the actuating piston hole and moving in a sliding direction of the actuating piston is smaller than an effective area of action of the secondary piston for being pushed by a liquid in the secondary piston hole and moving in a sliding direction of the secondary piston; and
a positioning and pressure control unit, the actuating oil line being connected to an oil supply line through the positioning and pressure control unit,
wherein, when the rocker arm does not actuate the valve bridge and the oil supply line supplies oil to the actuating oil line, the actuating piston extends out to contact the valve bridge under a hydraulic action of the actuating oil line, and the inner oil line is connected to the oil drain line; when the specialized actuating cam rotates to the round base component and is in a sliding or rolling fit with the primary piston, the primary piston extends out to contact the round base component under the hydraulic action of the actuating oil line; and when the specialized actuating cam rotates to the actuating lift boss and is in the sliding or rolling fit with the primary piston, the positioning and pressure control unit blocks the actuating oil line and the oil supply line, and a hydraulic linkage is formed between the primary piston and the secondary piston to make the actuating lift boss to actuate the actuating valve connected to the secondary piston to be displaced through the primary piston; or
wherein, when the rocker arm actuates the valve bridge to be displaced through the hydraulic lash adjuster, the oil drain line and the inner oil line are separated with the displacement of the valve bridge, the hydraulic linkage between the primary piston and the secondary piston is released, oil in the secondary piston hole is drained out, and the secondary piston is reset within the valve bridge;
the oil supply line unidirectionally supplies oil to the actuating oil line through the positioning and pressure control unit;
the actuator is provided with a shaft hole matching the rocker arm shaft, the rocker arm shaft passes through the shaft hole, and the actuator is fixedly connected to the rocker arm shaft through the positioning and pressure control unit;
the positioning and pressure control unit includes a positioning screw and a unidirectional component, the positioning screw has an oil chamber and an oil inlet line connected to the oil chamber, and the oil supply line is disposed on the rocker arm shaft; and
the positioning screw is threadedly connected to the actuator to fix the actuator on the rocker arm shaft, the oil chamber remains connected to the actuating oil line, the oil supply line is connected to the oil inlet line, and the unidirectional component is disposed on the positioning screw and the oil inlet line is unidirectionally connected to the oil chamber.