Engine brake apparatus
First Claim
1. A system for transferring engine valve actuation motion between first and second valve train elements, said system comprising:
- an actuator piston bore formed in the second valve train element;
an actuator piston slideably disposed in the actuator piston bore;
a solenoid control valve;
a first hydraulic fluid supply passage connected to the solenoid control valve;
a hydraulic circuit extending between the actuator piston bore and the solenoid control valve;
a solenoid actuated valve disposed in said hydraulic circuit between the solenoid valve and the actuator piston bore; and
a means for expanding the volume of the hydraulic circuit during times when the solenoid control valve opens to provide hydraulic fluid from the first hydraulic fluid supply passage to the solenoid actuated valve.
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Accused Products
Abstract
Apparatus and methods for hydraulic valve actuation of engine valves are disclosed. An exemplary embodiment of the present invention may include a lost motion piston assembly that transfers motion between first and second rocker arms to selectively provide auxiliary engine valve actuation motions to the engine valves for engine operations such as engine braking and exhaust gas recirculation. The lost motion piston assembly may reduce or eliminate transient loads that may otherwise be transmitted to engine valve train elements during the times that lost motions systems are turned on and off for auxiliary valve actuations.
17 Citations
19 Claims
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1. A system for transferring engine valve actuation motion between first and second valve train elements, said system comprising:
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an actuator piston bore formed in the second valve train element; an actuator piston slideably disposed in the actuator piston bore; a solenoid control valve; a first hydraulic fluid supply passage connected to the solenoid control valve; a hydraulic circuit extending between the actuator piston bore and the solenoid control valve; a solenoid actuated valve disposed in said hydraulic circuit between the solenoid valve and the actuator piston bore; and a means for expanding the volume of the hydraulic circuit during times when the solenoid control valve opens to provide hydraulic fluid from the first hydraulic fluid supply passage to the solenoid actuated valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. The system of claim 20 wherein the second valve train element is a rocker arm.
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15. A system for transferring engine valve actuation motion between first and second valve train elements, said system comprising:
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an actuator piston bore formed in the second valve train element; an actuator piston slideably disposed in the actuator piston bore; a solenoid control valve; a first hydraulic fluid supply passage connected to the solenoid control valve; a solenoid actuated valve bore in hydraulic communication with the solenoid control valve; a solenoid actuated valve piston slideably disposed in the solenoid actuated valve bore, said solenoid actuated valve piston having first, second and third annular recesses; means for biasing the solenoid actuated valve piston towards the solenoid control valve; a second hydraulic fluid supply passage connected to the solenoid actuated valve bore; a first hydraulic fluid vent passage connected to the solenoid actuated valve bore; a second hydraulic fluid vent passage connected to the solenoid actuated valve bore; a first actuator hydraulic passage extending between an upper portion of the actuator bore and the solenoid actuated valve bore; and a second actuator hydraulic passage extending between a lower portion of the actuator bore and the solenoid actuated valve bore, wherein the position of the solenoid actuated valve piston is selectively controlled by the solenoid control valve to provide hydraulic communication (1) between the second hydraulic fluid supply passage and the first actuator hydraulic passage, and between the second hydraulic fluid vent passage and the second actuator hydraulic passage, and (2) between the second hydraulic fluid supply passage and the second actuator hydraulic passage, and between the first hydraulic fluid vent passage and the first actuator hydraulic passage. - View Dependent Claims (16, 17, 18, 19)
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Specification