Abstract:
Aspects of the present disclosure are directed to valve clearance adjustment systems and related methods that can be used to quickly and easily establish and accurately fix a desired gap between valve stems and associated valve adjustment screws attached to rocker arms, such as may be used with intake valves, exhaust valves, and fuel-injection mechanisms, among others, within, e.g., an internal combustion engine. Various alternative implementations and related methods are provided.
Abstract:
L'invention concerne un dispositif d'actionnement par came (2) d'au moins une soupape (3) montée pour coulisser dans un support (1), le dispositif comportant un poussoir (8) destiné à être monté sur une extrémité libre d'une queue de la soupape (3a) et mobile par rapport au support (1); et des moyens de rappel élastiques (9) du poussoir destinés à mettre le poussoir (8) en appui contre la came (2); caractérisé en ce que le dispositif comporte des moyens électromagnétiques de verrouillage comprenant un actionneur électromagnétique (22) ayant un bobinage (24), de préférence extérieur au poussoir (8), et au moins une goupille (12) soumise au champ magnétique de l'actionneur (22) de sorte que l'alimentation du bobinage (24) entraîne un déplacement sélectif de la goupille (12) entre une position verrouillée dans laquelle le poussoir (8) est lié en translation à la soupape (3) et une position déverrouillée dans laquelle le poussoir (8) coulisse librement sur la queue de soupape (3a).
Abstract:
The present invention relates to a valve yoke (8) for a combustion engine, which is adapted to transmitting a control movement from a rocker arm (6) to two valves (9) in a combustion space (10). The valve yoke (8) comprises a first contact surface (8a l ) adapted to being in contact with the rocker arm (6), two second contact surfaces (8b l ) each adapted to being in contact with one of the two valves (9), and a control duct (12) which has a first aperture (12a) for accommodating a control element (13). The control duct (12) comprises a second aperture (12b) and the valve yoke (8) comprises an external surface constituting a lubrication path (14a-c) which extends from a peripheral surface (8a l ) of the valve yoke where this is availability of lubricant to the second aperture (12b) of the control duct.
Abstract:
Assembly consisting of an internal combustion engine cylinder valve (4) returned to a closed position against a seat (7) by a spring (16) positioned around a valve stem (3), and of an actuator (14) for returning the valve (4) to the open position comprising an actuator rod (8) designed to collaborate with the valve stem (3). Between the valve stem (3) and the actuator rod (8) there is a variable-length self-adjusting end stop (17; 27) designed to fill the clearance gap between the stem and the rod (3, 8).