Abstract: A valve lift adjustment arrangement for a mechanically-controllable valve drive arrangement includes a bearing shaft, a first roller, a second roller arranged on the bearing shaft, a camshaft arrangement, a valve lift adjustment device comprising a rotatable eccentric shaft, an intermediate lever arrangement, and a device. The intermediate lever arrangement comprises an intermediate lever with a working curve. The intermediate lever is mounted via the first roller to be movable in a slotted-guide track and to be operatively connected to the camshaft arrangement and to the valve lift adjustment device. The device is configured so that the second roller is eccentrically mounted. The device comprises a tool engagement point which aligns the second roller and thereby the intermediate lever arrangement. The camshaft arrangement acts, via the first roller, on the intermediate lever arrangement. The rotatable eccentric shaft is acts, via the second roller, on the intermediate lever arrangement.

Abstract: A switching roller finger follower, including: a housing with a first wall with a first opening, a second wall with a second opening, and an interior space at least partially formed by the walls; first and second outer arms; and a locking pin disposed in the openings and including a longitudinal axis, a body, and first and second protrusions extending radially outward from the body, formed of a same piece of material as the body, and at least one of which is located within the space. A respective portion of at least one of the first or second protrusions is aligned with the first or second wall in a direction parallel to the first longitudinal axis. The locking pin is displaceable such that: in a locked mode, the locking pin blocks pivoting of the arms; and in an unlocked mode, the locking pin is free of contact with the arms.

Abstract: A method of molding a valve lifter guide includes determining a flow path of injected material in the mold cavity by including a thin walled section in the formed guide. A leading edge of the material flow path forms a dam when crossing a thin walled section in the mold cavity to change a direction of a portion of the leading edge of the material flow path, until the leading edge meets a trailing edge of the material. The valve lifter guide includes a front wall, rear wall, a first radiused end wall, a second radiused end wall, and a bottom surface having an elongated socket. A tab extending from the valve guide support member has a first projection. The valve guide support member is disposed between the engine block and a cylinder head and the first projection is received in an opening of the engine block.

Abstract: A method of manufacturing a lift transmitting component (2), particularly for a gas exchange valve train or a fuel pump drive of an internal combustion engine (1), is provided, The lift transmitting component includes a housing (6), a bearing pin (7) fixed in a reception bore (9) of the housing (6) and a roller (8) mounted through a sliding or a rolling bearing on the bearing pin (7). The bearing pin is core-hardened over an entire axial length to a core hardness of at least 650 HV, and pin ends (10) of the core-hardened bearing pin are radially widened relative to the reception bore for enabling a connection of the bearing pin to the housing (6) through positive engagement. The hardness of the bearing pin is at the most 780 HV, the radial widening of one of the pin ends being realized with a shaping die (11) which travels axially parallel to the bearing pin (7) and applies a force to the pin end in a transition region between a periphery and a front end surface of the bearing pin.

Abstract: A finger follower lever of a valve train, which has a lever body that is a pressed and punched component made of sheet metal and has a U-shaped cross-section with two largely parallel side walls. A roller rotatably mounted between the side walls on a pin. The pin is uniformly hardened and inserted at each end into a hole punched out of the side wall and is staked or caulked at the ends. To enable the holes to be punched out simultaneously in opposite directions of a relatively narrow lever body, at least one of the two side walls has, at least on the outside thereof, a flat recess in the region of the hole.

Abstract: Devices and related methods are disclosed that generally involve variable force valve springs for controlling the motion of an engine valve. The force exerted by the valve spring can be adjusted by altering the pressure at which a fluid is supplied to a fluid chamber thereof, by altering the volume of the fluid chamber, and/or by changing the aggregate surface area over which fluid pressure is coupled to the engine valve. Associated fluid control systems are also disclosed herein, as are various methods for adjusting the force of a valve spring based on a variety of engine parameters, such as engine speed, engine load, and/or a combination thereof.

Abstract: A camshaft damping mechanism may include first and second housing members and a biasing member. The first housing member may be engaged with a camshaft. The second housing member may be slidably coupled to the first housing member and may abut an engine structure. The biasing member may be retained axially between the first and second housing members and may force the first housing member in an outward axial direction from the second housing member.

Abstract: A method of manufacturing a lift transmitting component (2), particularly for a gas exchange valve train or a fuel pump drive of an internal combustion engine (1), is provided, The lift transmitting component includes a housing (6), a bearing pin (7) fixed in a reception bore (9) of the housing (6) and a roller (8) mounted through a sliding or a rolling bearing on the bearing pin (7). The bearing pin is core-hardened over an entire axial length to a core hardness of at least 650 HV, and pin ends (10) of the core-hardened bearing pin are radially widened relative to the reception bore for enabling a connection of the bearing pin to the housing (6) through positive engagement. The hardness of the bearing pin is at the most 780 HV, the radial widening of one of the pin ends being realized with a shaping die (11) which travels axially parallel to the bearing pin (7) and applies a force to the pin end in a transition region between a periphery and a front end surface of the bearing pin.

Abstract: A titanium alloy tappet that is slidable at a high speed is provided by covering shortcomings of lightweight and high-strength titanium alloy. A surface 1A of at least a slidable portion of the tappet 1 for use with a valve system is subjected to a carburizing process.

Abstract: A passage intake control device includes a passage member, a valve disposed in the passage member and a shaft passing through a through hole of a valve shaft part of the valve. The valve shaft part includes a fitting hole portion as a part of the through hole. The fitting hole portion is provided by at least a first wall, a second wall, a third wall and a fourth wall. The shaft includes a fitting part having a polygonal shape including at least a first shaft surface a second shaft surface, a third shaft surface and a fourth shaft surface. The fitting part is fitted in the fitting hole portion such that the first to fourth shaft surfaces are opposed to the first to fourth walls of the fitting hole portion, respectively. The first and second walls have protruded ribs. The third and fourth walls include flat portions.

Abstract: An electromagnetic hydraulic valve (1), which including an electromagnet (2) with an armature (3) and of a valve housing (4) with an axial bore (5) and a piston valve (6) located therein is provided. The valve housing (4) includes several annular grooves (8, 9, 10) in which several radial openings (11, 12, 13) are located, which open into the axial bore (5), through which the hydraulic valve (1) has a fluid connection with a pressure connection (P), a tank connection (T) and two consumer connections (A, B). The piston valve (6) is acted upon by the armature (3) of electromagnet (2) and includes two ring-shaped control sections (14, 15), which connect alternatively the pressure connection (P) and the tank connection (T) with one of the consumer connections (A, B) through axial movement of piston valve (6). According to the invention, the radial openings (11, 12, 13) in valve housing (4) are provided as windows having a rectangular cross section.

Abstract: A travel limited plunger for a hydraulic lifter for, among other purposes, use in racing and/or other high performance applications. In one variation, an existing retaining clip is replaced by a heavy duty retainer and a precisely sized spacer is inserted between the retainer and the plunger to limit travel of the plunger. In a second variation, the existing retaining clip is removed, a retaining groove is formed (e.g., by machining) within the interior of the lifter at a position located so as to allow a retainer inserted therein to limit travel of the plunger to a predetermined distance.

Abstract: A variable valve drive for changing control timing of cam-actuated gas-exchange valves of an internal combustion engine is provided, with a tappet (6a, 6b, 6c), which, with convex cam engaging contour (5), engages a cam (4a, 4b, 4c) of a camshaft (3a, 3b, 3c) and which is guided so that it can move in the longitudinal direction in a rotatable tappet guide (7a, 7b, 7c), whose rotational angle (9) is adjustable for changing the control timing. In this way, the tappet guide (7a, 7b, 7c) can rotate about a rotational axis (8) parallel to a longitudinal axis (2) of the camshaft (3a, 3b, 3c).

Abstract: A valve lifter and a method of manufacture thereof is provided in which sliding properties of a cam on a cam-contacting sliding surface in an upper surface of a valve lifter are improved by forming the cam-contacting sliding surface as a concave surface to permit retention of lubricating oil therein. The cam-contacting sliding surface is integrally provided in an outer wall of an upper part of a valve lifter. The cam-contacting sliding surface is formed as a concave surface to provide better retention of the lubricating oil. The concave sliding surface is formed during high temperature oxidation of the valve lifter by permitting the natural slumping down of the upper part due to its own weight under the gravity.

Abstract: The present invention relates to a lash adjuster body, comprising A lash adjuster body, comprising an outer surface, enclosing a cavity, wherein the cavity includes an inner surface configured to accommodate an insert and a spring; and the cavity is fabricated through forging.

Abstract: The present invention relates to a method for fabricating a roller follower assembly, comprising the steps of fabricating a lash adjuster body, fabricating a roller follower body, fabricating a leakdown plunger, fabricating a socket, wherein at least one of the lash adjuster body, roller follower body, leakdown plunger, and socket is fabricated at least in part by forging.

Abstract: The present invention relates to a process for producing a wear-resistant coating and to a wear-resistant coating on predetermined surfaces of machine or engine parts, in particular for internal combustion engines, which are exposed to frictional wear, comprising at least one nanocrystalline functional layer (4) made up of at least two CrNx phases for reducing friction and increasing the wear resistance of the predetermined surface (2) of the machine or engine part (1).

Abstract: The present invention relates to a valve lifter body, comprising an outer surface, enclosing a first cavity and a second cavity, wherein the first cavity includes a first inner surface configured to house a cylindrical insert, the second cavity includes a second inner surface cylindrically shaped, and at least one of the cavities is fabricated through forging.

Abstract: The present invention relates to a valve lifter body, comprising an outer surface, enclosing a first cavity and a second cavity, wherein the first cavity includes a first inner surface configured to house a cylindrical insert, the second cavity includes a second inner surface cylindrically shaped, and at least one of the cavities is fabricated through forging.

Abstract: An engine pushrod which includes a plastic shaft in the form of a rod or tube, and a metal cap on at least one of the ends of the plastic shaft. The plastic shaft may be a molded plastic rod made from an engineered resin material, and may take one of several different shapes, such as a round or “T-shaped” cross-sectional profile. There may be a metal cap on both ends of the plastic shaft, and each of the metal caps may be shaped with a stamping process and hardened. The caps may be crimped onto the ends of the plastic shaft or they may be insert molded. Preferably, either method provides a part with excellent TIR and surface finish, and which meets torque requirements. Preferably, the assembly is lightweight and meets all requirements and the resin material is high temperature resistant and oil resistant.

Abstract: A hydraulic lash adjuster (11) for an internal combustion engine, and an improved method of assembly of such a lash adjuster. The lash adjuster (11) is of the type having a body (13), a plunger (15), and a check valve assembly (17). In accordance with one aspect of the invention, the check valve assembly comprises a cartridge (17A;17B) comprising a member (27;41) separate from the plunger (15) and defining a valve seat (27S;41S). The check valve cartridge is capable of being assembled and tested for compliance with a predetermined relationship of flow versus pressure differential, prior to assembly into the plunger (15). In accordance with the improved method of assembly, a plurality of different bodies (13A;13B) and plungers (15A;15B;15C;15D) is provided, as well as a plurality of different, interchangeable check valve cartridges (17A;17B), and the assembly operator selects a body, a plunger, and a cartridge to provide an assembled lash adjuster having the predetermined, desired operating parameters.

Abstract: A metal gasket assembly has a gasket plate and an annular grommet. The gasket plate is formed with an opening having opposing surfaces adjacent the opening to define a predetermined fixed thickness of a plate. The annular grommet has an elastically deformable U-shaped body. The U-shaped body has legs presenting outer sealing surfaces defining an initial undeformed thickness that is greater than the thickness of the gasket plate. The opening formed in the gasket plate receives the grommet. A compressive force applied in a generally perpendicular direction to the opposing surfaces of the gasket plate deform the legs of the body to a reduced thickness corresponding substantially to the thickness of the gasket plate. When the compressive force is reduced with changes in operating conditions, the legs of the grommet return toward their original undeformed thickness to maintain a seal.

Abstract: A known electromagnetic actuator comprises two electromagnets arranged opposite one another, an armature that is movable back and forth between the electromagnets against the force of two mutually counteracting springs, as well as adjusting means for adjusting the idle or rest position of the armature. In this regard, it is shown to be disadvantageous, that after several hours of operation a readjustment of the pre-tension of the springs determining the rest position may be necessary. The new method is to enable an adjustment of the pre-tension of the springs that is durable and optimal for the operation of the actuator. This is achieved in that the springs are compressed in repeating compression cycles so often until the energy respectively stored therein due to their compression no longer or only insignificantly differs from the energy stored in the respective spring in a preceding compression cycle, and in that the adjustment of the pre-tension of the springs is only carried out thereafter.