Abstract:
A hydraulic tappet includes a tubular cylinder sideable within a bore of a housing, a piston with a reservoir slideably mounted within the tubular cylinder, a lower piston spring biased away from the piston with the reservoir forming a pressure chamber therebetween. The reservoir being in open communication with pressure oil ports and the pressure chamber selectively being closed or open to said reservoir. The closing or opening of the pressure chamber being controlled by the lower piston and cylinder riding on tracks of a cam which control the relative position of the cylinder and lower piston.
Abstract:
The invention relates to a control arrangement for gas exchange in a piston engine adapted between a cam device (5) of a camshaft (4) of the engine (1) and an inlet valve mechanism (6) arranged to open and close the inlet valve (3) in association with a cylinder of the engine, which control arrangement (7) comprises a body part (8), in which a piston device (9) is movably arranged to be in force transmission connection with the camshaft (4) and the valve mechanism (6). The cam device (5) includes a cam profile (5') having a portion (5c) arranged under a base circle (5a) of the cam profile (5'). Said portion (5c) of the cam profile (5') is arranged to control gas exchange through the inlet valve (3), specifically for providing a delay in the closing of the inlet valve (3).
Abstract:
The invention proposes a push-rod valve train having an adjustable valve tappet (1). This has an outer part (2a, 2b), an inner part (8) and a lost-motion spring (10), which forces the inner part (8) towards a relative position, at least one retainer ring (23), which is fixed in an annular groove (21) of the outer part (2a, 2b) and which interacts with a stop face (22) of the inner part (8), being provided for fixing the relative position, said retainer ring having lugs (28) extending radially inwards and separated by a fitting gap (27). In this the free movement of the valve push rod (15) relative to the lugs (28) is assured by the provision of a torsional locking means (30a, 30b), which serves to fix the radial position of the fitting gap (27) inside the annular groove (21).
Abstract:
Die Erfindung betrifft ein hydraulisches Reverse Spring-Ventilspielausgleichselement (RSHVA) für den Ventiltrieb eines Verbrennungsmotors, das folgende Merkmale aufweist: Ein Gehäuse (2), das eine Sackbohrung (3) besitzt, in die ein Kolben (4) mit Dichtspiel geführt ist; der Kolben (4) weist ein Kolbenunterteil (4a) mit einem unteren Kolbenboden (5) auf, der zusammen mit der Sackbohrung (3) einen Hochdruckraum (7) begrenzt, während sich oberhalb des unteren Kolbenbodens (5) ein Niederdruckraum (8) befindet; die Druckräume (7, 8) sind durch eine zentrale Axialbohrung (10) im unteren Kolbenboden (5) verbunden, der durch ein auf der Unterseite (23) des unteren Kolbenbodens (5) angeordnetes Steuerventil (11) beherrscht ist; das Steuerventil (11) besitzt eine Steuerventilkugel (19), die durch eine Steuerventilfeder (20) in Öffnungsrichtung beaufschlagt ist und deren Hub durch eine Hubbegrenzung (24) einer Ventilkugelkappe (21) begrenzt ist. Ein RSHVA, dessen Leerhub möglichst unabhängig von der Viskosität und damit von der Temperatur des Schmieröls ist zu schaffen wird dadurch erreicht, dass temperaturempfindliche, die Schließzeit des Steuerventils (11) beeinflussende Mittel vorgesehen sind, die zu einer von der Schmieröltemperatur des Verbrennungsmotors weitgehend unabhängigen Schließzeit des Steuerventils (11) führen.
Abstract:
Vorgeschlagen ist ein Schaltelement (1) für einen Ventiltrieb einer Brennkraftmaschine, vorzugsweise zur Ventilabschaltung, mit einer einfach zu realisierenden Maßnahme einer Einstellung des Koppelspiels dessen Koppelmittel (8) in einer Aufnahme (6) über zwei Sicherungsringe (19, 20), von denen einer dickenvariabel bereitgehalten wird.
Abstract:
A valve mechanism includes: a support shaft immovably fixed to a main body of an internal combustion engine, a main arm swingably supported by the support shaft; two sub-arms arranged at both sides of the main arm; a coupling support portion swingably supporting and coupling the two sub-arms to the main arm; a cam; and a roller rotatably located in the main arm. Each of the two sub-arms includes: a drive unit pressing and driving a valve; and a contact portion contacting a plunger of a lash adjuster, the contact portion has a curved surface slidably contacting a flat surface formed in a tip portion of the plunger and having an arc-like curved surface shape of which a central axis line corresponds to a central swing axis line of the main arm in a state where the cam abuts on the roller in a base circular portion of the cam.
Abstract:
A rocker arm assembly including a rocker arm with an end portion including a socket portion on a top surface and a groove formed on the socket portion is provided. A clip having a generally C-shaped cross-section is provided. The clip includes a first leg with an opening that defines an inner edge that at least partially engages the groove on the socket portion of the rocker arm. The clip includes an intermediate leg including an opening through which a protrusion on the axial end of the rocker arm extends. The clip includes a second leg including first and second leg portions that engage the bottom surface of the rocker arm.
Abstract:
Provided is a variable valve device for an internal combustion engine. The variable valve device includes intake- and exhaust-side swing arms that pivot to open and close intake valves and exhaust valves in two cylinders #1, #2, intake- and exhaust-side hydraulic lash adjusters that serve as pivot points of the respective swing arms, a variable valve system that continuously varies valve lift characteristics of the intake valves and lost motion mechanisms that stop opening and closing of the intake exhaust valves by lost motion of the intake- and exhaust-side hydraulic lash adjusters on the cylinder #1. The maximum valve lifts of the intake valves are set larger than valve lifts of the exhaust valves. The minimum valve lifts of the intake valves are set smaller than the valve lifts of the exhaust valves.
Abstract:
The invention proposes a push-rod valve train having an adjustable valve tappet (1). This has an outer part (2a, 2b), an inner part (8) and a lost-motion spring (10), which forces the inner part (8) towards a relative position, at least one retainer ring (23), which is fixed in an annular groove (21) of the outer part (2a, 2b) and which interacts with a stop face (22) of the inner part (8), being provided for fixing the relative position, said retainer ring having lugs (28) extending radially inwards and separated by a fitting gap (27). In this the free movement of the valve push rod (15) relative to the lugs (28) is assured by the provision of a torsional locking means (30a, 30b), which serves to fix the radial position of the fitting gap (27) inside the annular groove (21).
Abstract:
A multiple-cylinder internal combustion engine having a camshaft-driven valvetrain with a camshaft disposed within an engine block includes at least two intake and/or exhaust valves with multiple valves operated by a common lifter and pushrod that engages a follower having multiple independent lash adjusters coupled to associated rocker arms. The lifter contacts the common camshaft lobe and a corresponding pushrod that engages a reciprocating bucket follower with a compliant coupling to corresponding rocker arms.