Engine braking device with double oil pressure control valves and method thereof
A technology of engine braking and oil pressure control valves, which is applied in the direction of valve devices, engine components, machines/engines, etc. It can solve the problems of no dual oil pressure control valves in the braking system, unfavorable normal operation of the engine, and inability to fully start the engine, etc. , to achieve the effect of unlimited installation direction, compact structure and reduced cycle time
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Embodiment 1
[0088] Figure 2A and 2B It is a schematic diagram of the first embodiment of the engine braking device of the present invention in its "off" and "on" positions respectively. Three main components are included in the figure: the drive mechanism 100 for engine braking, the exhaust valve actuator 200 and the exhaust valve 300 (300a and 300b). Since a rocker arm 210 is used to open the double valve 300, a valve bridge 400 needs to be added. The combination of the exhaust valve actuator 200 , the exhaust valve 300 and the valve bridge 400 is collectively referred to as an exhaust valve system.
[0089] Exhaust valve actuator 200 includes cam 230 , cam follower 235 , push rod or tube 201 , and rocker arm 210 . Usually at one end of the rocker arm 210 (at one end of the hair bridge or one end of the push rod), there is also a valve gap adjustment system. In this embodiment, the valve gap adjusting screw 110 is connected to the push rod 201 and is fixed on the rocker arm 210 by the...
Embodiment 2
[0101] image 3 It is a schematic diagram of the second engine braking device embodiment of the present invention in its "on" position, and Figure 2B The only difference in the illustrated embodiment is the use of a different support mechanism 250 . The support mechanism 250 of this embodiment is located under the valve bridge 400, and in the middle of the two exhaust valves 300a and 300b, instead of using the external air valve spring of the engine, a special support spring 312 is used to bias the spring seat 122 to a fixed position. On the retaining ring 302r of the reset piston terminal 182. The terminal end 182 of the reset piston is also used as a guide rod for the spring seat 122 to move up and down, and can be designed as a screw, while the retaining ring 302r can be a nut, so as to adjust the height of the spring seat 122 . Spring seat 122 has a drain hole or cutout 124 for draining oil. The valve bridge 400 is supported by the spring seat 122 instead of being supp...
Embodiment 3
[0116] Figure 6A and 6B is a schematic view of a third engine braking device embodiment of the present invention in its "off" and "on" positions. The engine is an overhead cam engine, so the valve clearance adjustment system is installed on the hair bridge 400 side. The slack adjustment system includes an adjustment screw 110 containing a fluid passage 115 . The lower side 112 of the adjusting screw 110 is connected with the foot pad 114 , and the upper side thereof is fixed on the rocking arm 210 by the locking nut 105 . This braking device is also suitable for the aforementioned push rod engine.
[0117] In this embodiment, brake pistons (also known as driving pistons or mechanical pistons) 160 a and 160 b (abbreviated as 160 ) are slidably disposed in the hole 415 of the valve bridge 400 . The details of the brake piston 160 are as Figure 6C shown. It contains a first surface 140 corresponding to the operating position and a second surface 145 corresponding to the n...
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