| Jacobs Vehicle Systems, Inc. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120131808 | APPARATUS AND METHOD FOR VALVE LASH ADJUSTMENT - Methods and apparatus for setting a lash space between a lost motion piston and an engine valve or other components of an internal combustion engine are disclosed. The apparatus may include a lock nut gauge, a zero setting gauge extending into the lock nut gauge, a lash setting gauge extending into the zero setting gauge, and a bit stem extending through the lash setting gauge. The bit stem may include a bit which is used to rotate a tappet screw that sets the lash. A key extending between the zero setting gauge and a scroll channel in the lash setting gauge may be used to control setting of the tappet screw, and thus the setting of lash. | 05-31-2012 |
| 20120024260 | COMBINED ENGINE BRAKING AND POSITIVE POWER ENGINE LOST MOTION VALVE ACTUATION SYSTEM - A system for actuating one or more engine valves for positive power operation and engine braking operation is disclosed. In a preferred embodiment, an exhaust valve bridge and intake valve bridge each receive valve actuations from two sets of rocker arms. Each valve bridge includes a sliding pin for actuating a single engine valve and an outer plunger disposed in the center of the valve bridge to actuate two engine valves through the bridge. The outer plunger of each valve bridge may be selectively locked to its valve bridge to provide positive power valve actuation. During engine braking, application of hydraulic pressure to the outer plungers may cause the respective valve bridges and outer plungers to unlock so that all engine braking valve actuations are provided from a rocker arm acting on one engine valve through the sliding pin. | 02-02-2012 |
| 20110297123 | BIAS SYSTEM FOR DEDICATED ENGINE BRAKING ROCKER ARM IN A LOST MOTION SYSTEM - A lost motion valve actuation system includes an engine brake housing and one or more hydraulic fluid supply passages extending through the housing. Master and slave pistons are slidably disposed corresponding bores in the housing. The master and slave pistons are used to provide selective actuation to one or more engine valves. An engine brake rocker arm disposed adjacent to the housing includes a master piston contact surface and a bias mechanism contact surface. A bias mechanism is disposed in the housing and includes a bias piston which extends from the housing. The bias piston biases the rocker arm out of contact with an engine cam during select engine operation modes, such as during a positive power mode of operation. The bias piston may be mechanically or hydraulically repositioned to permit the rocker arm to contact the engine cam during a second mode of engine operation, such as an engine braking mode. | 12-08-2011 |
| 20110290206 | ROCKER SHAFT PEDESTAL INCORPORATING AN ENGINE VALVE ACTUATION SYSTEM OR ENGINE BRAKE - A system for actuating an engine valve is disclosed. The system may include a rocker shaft having a hydraulic fluid supply circuit extending through the rocker shaft to a port on the outer surface of the rocker shaft and a solenoid valve adapted to selectively supply hydraulic fluid to the rocker shaft hydraulic fluid supply circuit. The rocker shaft may be supported by one or more rocker shaft pedestals. A lost motion housing may be incorporated into a rocker shaft pedestal and disposed about the rocker shaft. The lost motion housing may have an actuator piston assembly and a control valve assembly connected by an internal hydraulic circuit. The lost motion housing may be secured in a fixed position relative to the rocker shaft. External hydraulic fluid tubing may be provided between the solenoid valve and the control valve in the form of jumper tubes extending between adjacent rocker shafts or in the form of external hydraulic fluid tubes extending from control valve to control valve. | 12-01-2011 |
| 20110197833 | Variable Lost Motion Valve Actuator and Method - A lost motion engine valve actuation system and method of actuating an engine valve are disclosed. The system may comprise a valve train element, a pivoting lever, a control piston, and a hydraulic circuit. The pivoting lever may include a first end for contacting the control piston, a second end for transmitting motion to a valve stem and a means for contacting a valve train element. The amount of lost motion provided by the system may be selected by varying the position of the control piston relative to the pivoting lever. Variation of the control piston position may be carried out by placing the control piston in hydraulic communication with a control trigger valve and one or more accumulators. Actuation of the trigger valve releases hydraulic fluid allowing for adjustment of the control piston position. Means for limiting valve seating velocity, filling the hydraulic circuit upon engine start up, and mechanically locking the control piston/lever for a fixed level of valve actuation are also disclosed. | 08-18-2011 |
| 20110132298 | VALVE BRIDGE WITH INTEGRATED LOST MOTION SYSTEM - A system and method of actuating one or more engine valves is disclosed. In one embodiment, the system comprises: a valve train element; a rocker arm pivotally mounted on a shaft and adapted to rotate between a first position and a second position, the rocker arm selectively receiving motion from the valve train element; a valve bridge disposed above the one or more engine valves; and a lost motion system disposed in the valve bridge. | 06-09-2011 |
| 20110067661 | LOST MOTION VARIABLE VALVE ACTUATION SYSTEM WITH VALVE CATCH PISTON - Hydraulic lost motion systems and methods for actuating an internal combustion engine valve include a master piston slidably disposed in a housing. One or more master piston fluid passages extend from a bore provided in the master piston and register with a fluid passage extending through the housing. A slave piston is slidably disposed in a lower portion of the master piston bore and a valve catch piston is slidably disposed in an upper portion of the master piston bore. The valve catch piston may have a hollow interior, a lower end orifice extending from the hollow interior through a lower end of the valve catch piston, one or more side passages extending through a side portion of the valve catch piston, and one or more seating passages extending through the valve catch piston wall. | 03-24-2011 |
| 20100319657 | METHOD AND SYSTEM FOR SINGLE EXHAUST VALVE BRIDGE BRAKE - Systems and methods for providing compression-release and partial bleeder braking engine valve actuation are disclosed. In an embodiment of the present invention, a cam may be provided with a main exhaust lobe and a compression-release or partial bleeder lobe and a base circle portion between the two lobes. A rocker arm including an internal rocker passage may be operatively connected to the cam. The rocker arm may contact a valve bridge at a central portion. The valve bridge may be operatively connected to first and second engine valves at its first and second ends, respectively. A slave piston incorporated into the first end of the valve bridge and a master piston may be incorporated into the central portion of the valve bridge. A hydraulic circuit may be provided between the master and slave pistons. The master and slave pistons may be selectively actuated and the bleed hole may be selectively blocked and unblocked to provide compression-release or partial bleeder braking as a result of the valve actuation motion imparted from the cam to the valve bridge through the rocker arm. | 12-23-2010 |
| 20100251983 | INDIVIDUAL ROCKER SHAFT AND PEDESTAL MOUNTED ENGINE BRAKE - A system for actuating an engine valve is disclosed. The system may include a lost motion housing having two spaced collars surrounding a rocker shaft. The lost motion housing may include an internal hydraulic circuit connecting a hydraulic fluid supply passage with an actuator piston. The system may include a means for securing the lost motion housing in a fixed position relative to the rocker shaft. | 10-07-2010 |
| 20100108007 | ROCKER SHAFT MOUNTED ENGINE BRAKE - A system for actuating an engine valve is disclosed. The system may include a lost motion housing having two spaced collars surrounding a rocker shaft. The lost motion housing may include an internal hydraulic circuit connecting a hydraulic fluid supply passage with an actuator piston. The system may include a means for securing the lost motion housing in a fixed position relative to the rocker shaft. | 05-06-2010 |
