Abstract:
A method for setting lash on a switching rocker arm assembly includes providing a rocker arm having (i) an outer arm having a first outer side arm and a second outer side arm, the outer arm defining an opening, (ii) an inner arm disposed between the first and second outer side arms, (iii) a roller follower that selectively engages a cam, the roller follower mounted about a bearing axle that extends through the opening. A zero lash shim is inserted into a gap defined between the bearing axle and the outer arm at the opening. The rocker arm is installed into the valvetrain with the master tip cap. Lash is measured between the cam and the roller follower. The rocker arm and the master tip cap is removed. A select fit valve tip cap is installed based on the master tip cap and the measured lash.
Abstract:
A method of lubricating one or more valve train (100) components includes delivering a lubricating fluid to the inner cavity (156) of a fluid collecting member (152) through a radially extending discharge portion (182) of a fluid passage (176) in a rocker arm insert. The insert fluid passage (176) is in fluid communication with a lubricating fluid source to dispense a controlled amount of lubricating fluid to one or more valve train components during operation of an engine. The radially extending discharge portion of the fluid passage in the insert may be positioned adjacent to a spherical end cap that is received in the inner cavity of the fluid collecting member.
Abstract:
The invention relates to a cam actuator (2) for actuating at least one valve (3) slidably mounted in a mounting (1), the device comprising a tappet (8) which is to be mounted on a free end of a stem (3a) of the valve and which is mobile relative to the mounting (1); and a resilient return means (9) for the tappet, which to urge the tappet (8) against the cam (2), characterised in that the device comprises an electromagnetic locking means including an electromagnetic actuator (22) having a coil (24), preferably outside the tappet (8), and at least one pin (12) subjected to the magnetic field of the actuator (22), such that supplying power to the coil (24) causes the selective movement of the pin (12) between a locked position, in which the tappet (8) is translatably linked to the valve (3), and an unlocked position, in which the tappet (8) freely slides on the stem (3a) of the valve.
Abstract:
An apparatus includes a valve and an actuator. The valve has a portion movably disposed within a valve pocket defined by a cylinder head of an engine. The valve is configured to move relative to the cylinder head a distance between a closed position and an opened position. The portion of the valve defines a flow opening that is in fluid communication with a cylinder of an engine when the valve is in the opened position. The actuator is configured to selectively vary the distance between the closed position and the opened position.
Abstract:
A rotary valvetrain system, with a curved valve control stem, for opening and closing valves in a four-stroke internal combustion engine, allows a decrease in the dissipations and load losses, with the maximum system compactness, and it comprises: a valve (7; 16) with curved stem (30; 34); a rocker arm (9; 18) constrained to said valve (7; 16), having a respective spindle (10; 19) and recesses (9d, 9e) for housing a pair of disk-like cam followers (12; 21) and respective backlash-recovering plates (13; 22) interposed between the corresponding disk-like cam follower (12; 21) and said rocker arm (9; 18); a valve guide (14; 23) inserted in a respective seat at a duct which is opened and closed by said valve, wherein said curved stem (30; 34) slides sealingly; a sealing spring (15; 24) acting on said spindle (10; 19) to bring the valve (7; 16) in closing position; and a camshaft (25; 26) acting on said cam followers (12; 21).
Abstract:
Vorgeschlagen sind ein Ventiltrieb (1a, 1b) zur Betätigung eines Gaswechselventils (5) in einem Zylinderkopf (2) einer Brennkraftmaschine mit mechanischer Ventilspieleinstellung sowie ein Verfahren zu dessen Montage. Ein zwischen einem Nocken (3) einer Nockenwelle (4) und dem Gaswechselventil (5) angeordneter und auf einem im Zylinderkopf (2) stationären Abstützelement (8) mit starrer Bauhöhe (Merkmal YP) gelagerter Nockenfolger (10) ist zur Einstellung des Ventilspiels (21) gegenüber dem Nocken (3) und/oder dem Gaswechselventil (5) mit dem Abstützelement (8) maßlich gepaart. Dabei soll eine den Nockenfolger (10) und das Abstützelement (8) umfassende, in den Zylinderkopf (2) montierbare und außerhalb des Zylinderkopfs (2) gepaarte Baueinheit (6) mit einem gegebenen Einbausummenmaß vorgesehen sein.
Abstract:
A method and apparatus for setting valve clearances on overhead camshaft internal combustion engines is described. An elongate, removable shim element (82) is provided of rectangular section and formed with a groove (94) extending longitudinally thereof. The shim element (82) is slidably received in a recess (88) provided in a side wall of a cam-follower body (84). The valve clearance between a compression surface (86) of the cam-follower body (84) and a camshaft lobe can be adjusted by replacing the shim element (82). The shim element (82) can be replaced with stock items of varying thickness to facilitate rapid and efficient adjustment of the valve clearance. Much of the labour and time involved in adjusting the valve clearance using conventional methods is thereby eliminated as the camshaft(s) and drive gear do not need to be removed.
Abstract:
Upper and lower lift plates (5, 6) are used in a mechanical cup pushrod (1) to set the valve clearance. Here, the lower lift plates (6) have a substantially greater clearance adjustment range HSW than the upper lift plates (5). It is thus possible to reduce the total mass of the cup pushrod (1) further, because, when the cup pushrod (1) is first fitted, the valve clearance is set via the relatively small lower lift plate (6), hence with relatively low mass fluctuations.
Abstract:
A lash adjuster can include a hydraulic lash assembly, a mechanical lash assembly, and a check assembly. The hydraulic lash assembly can include a body, a top plunger, a leak down plunger, and the check assembly between the body and the leak down plunger. The mechanical lash assembly can be between the top plunger and the leak down plunger. The mechanical lash assembly can include a shim abutting the top plunger, a spacer, and a spring pressing against the spacer and the shim to form a gap between the top plunger and the leak down plunger. The lash adjuster can include the spring pressing directly against the spacer and directly or indirectly against the shim.
Abstract:
A hydraulic valve brake for a hydraulic valve drive of an internal combustion engine is provided. The valve brake includes a housing with a housing wall and with a housing base, and includes a piston which moves axially in the housing and one end side of which, together with the housing wall and the housing base, delimits a hydraulic pressure chamber and the other end side of which actuates a gas exchange valve. The housing wall is perforated in the region of the pressure chamber by one or more overflow openings, the opening cross sections of which are controlled by a control edge, which delimits the end side at the pressure chamber side, of the piston. In this case, it is the intention for the axial distance (h) between the control edge of the piston, when the latter is fully retracted into the housing, and the housing base to be set by a spacer of predetermined thickness (d).