摘要:
A switchable double tappet (1) is provided, especially for a tappet-push rod valve train of an internal combustion engine, with a cylindrical housing (2), which is arranged so that it oscillates via its outer casing (3) in a guide (4) in the internal combustion engine side and which has a bore (5) on the camshaft side, in which an inner element (6) moves axially relative to this borehole, wherein, on one side, a cam contact surface (10) is intrinsic to this inner element on its end projecting past an edge (7) of the borehole (5) or lower head (9) running in the region of the edge (7) and also, on the other side, at least one coupling slide (11) is intrinsic in its interior in the decoupled case, and this coupling slide can be displaced partially for a coupled case in or under a respective catch surface (12) of the housing (2), wherein between an upper head (13) of the inner element (6) facing away from the lower head (9) and a lower side (14) of a crossbar (15) of the housing (2), at least one lost-motion spring (16) is tensioned and, in a borehole (17) of the housing (2) away from the camshaft, above the crossbar (15), there are two supports (18) lying next to one another, on each of which an end of a tappet push rod can be supported.
摘要:
A valve train for an internal combustion engine is provided, with the valve train having a switchable rocker arm assembly (1) with a plurality of rocker arms (6, 7, 8) for activating at least one gas exchange valve (2), and also having at least one camshaft (3) with differently contoured cams (4, 5) through which different adjusting displacements can be imparted to individual rocker arms of the rocker arm assembly (1). The assembly further includes a switching device (9) for selectively activating the rocker arms for driving the gas exchange valve (2) with a varying valve lift. To create a valve train in which individual gas exchange valves can be operated in different modes of operation with only a small amount of construction work and expense, the rocker arm assembly (1) has a stationary rocker arm shaft (10) on which at least two outer rocker arms (6, 7), that are in continuous contact with associated, differently contoured cams (4, 5), and a center rocker arm (8) with a lever arm extension (11) through which the gas exchange valve (2), in operative connection to one of the two outer rocker arms (6, 7), can be selectively actuated, are mounted for tilting movement. Actuatable locking pins (12, 13) are arranged on the outer rocker arms (6, 7) for sliding axially parallel to the rocker arm shaft (10), a locking pin receiver (14) is arranged on the center rocker arm (8) and positioning aids (15, 16, 17) are arranged on the outer and the center rocker arms (6, 7, 8), so that the center rocker arm (8) can be selectively force-locked to one of the two outer rocker arms (6, 7) or be deactivated.
摘要:
A switchable double tappet (1) is provided, especially for a tappet-push rod valve train of an internal combustion engine, with a cylindrical housing (2), which is arranged so that it oscillates via its outer casing (3) in a guide (4) in the internal combustion engine side and which has a bore (5) on the camshaft side, in which an inner element (6) moves axially relative to this borehole, wherein, on one side, a cam contact surface (10) is intrinsic to this inner element on its end projecting past an edge (7) of the borehole (5) or lower head (9) running in the region of the edge (7) and also, on the other side, at least one coupling slide (11) is intrinsic in its interior in the decoupled case, and this coupling slide can be displaced partially for a coupled case in or under a respective catch surface (12) of the housing (2), wherein between an upper head (13) of the inner element (6) facing away from the lower head (9) and a lower side (14) of a crossbar (15) of the housing (2), at least one lost-motion spring (16) is tensioned and, in a borehole (17) of the housing (2) away from the camshaft, above the crossbar (15), there are two supports (18) lying next to one another, on each of which an end of a tappet push rod can be supported.
摘要:
A valve train for an internal combustion engine is provided, with the valve train having a switchable rocker arm assembly (1) with a plurality of rocker arms (6, 7, 8) for activating at least one gas exchange valve (2), and also having at least one camshaft (3) with differently contoured cams (4, 5) through which different adjusting displacements can be imparted to individual rocker arms of the rocker arm assembly (1). The assembly further includes a switching device (9) for selectively activating the rocker arms for driving the gas exchange valve (2) with a varying valve lift. To create a valve train in which individual gas exchange valves can be operated in different modes of operation with only a small amount of construction work and expense, the rocker arm assembly (1) has a stationary rocker arm shaft (10) on which at least two outer rocker arms (6, 7), that are in continuous contact with associated, differently contoured cams (4, 5), and a center rocker arm (8) with a lever arm extension (11) through which the gas exchange valve (2), in operative connection to one of the two outer rocker arms (6, 7), can be selectively actuated, are mounted for tilting movement. Actuatable locking pins (12, 13) are arranged on the outer rocker arms (6, 7) for sliding axially parallel to the rocker arm shaft (10), a locking pin receiver (14) is arranged on the center rocker arm (8) and positioning aids (15, 16, 17) are arranged on the outer and the center rocker arms (6, 7, 8), so that the center rocker arm (8) can be selectively force-locked to one of the two outer rocker arms (6, 7) or be deactivated.
摘要:
Device for coupling two valve activating levers of an internal combustion engine with at least one carrier body (1) mounted on the internal combustion engine, wherein at least one hollow shaft (2) in which oil of the internal combustion engine is stored is attached to the carrier body, and a coupling pin (9) is supported parallel to the hollow shaft (2) in each of the valve activating levers (4a, 4b) and is spring loaded on one side and loaded by pressurized fluid on the other side in such a way that the coupling pin (9) connects or releases the valve activating levers (4a, 4b), wherein control of the pressurized fluid that is taken advantageously from the oil circuit of the internal combustion engine is realized by at least one electromagnetically activated valve (14) and wherein the supply of pressurized fluid is realized by channels (13) that are provided in the carrier body (1) or carrier bodies of the internal combustion engine.
摘要:
The switchable hydraulic lash adjuster uses balls that move radially in order to lock and unlock the switchable elements in the hydraulic lash adjuster. An axially movable piston acts on the ball to force it to engage and to allow it to disengage the inner housing.
摘要:
The freely rotatable hydraulic pivot element for an internal combustion engine has four oil inlets which are in fluid communication with the lash adjusting element inside the pivot element and in fluid communication with the oil gallery by using four more equally spaced oil inlets in the outer housing of the cylinder head while still in fluid communication therein. The use of four or more oil inlets are in the same radial plane of the outside cylindrical housing of the pivot element.
摘要:
A device (1) for the hydraulic lash adjustment for several identically acting gas-exchange valves per cylinder of a valve train of an internal combustion engine is provided, the device (1) including a common housing (2) with directly adjacent pressure pistons (3) provided corresponding to the number of identically acting gas-exchange valves. Each pressure piston (3) moves relative to the housing in an axial direction in a separate guide (4) in the housing (2), and also has a support (6) for an at least indirect contact with the corresponding gas-exchange valve on a distal end (5) away from the housing, and a non-return valve (8) in the region of a housing bottom (7) wherein a separate high-pressure chamber (9) is associated with each pressure piston (3) in which the non-return valve (8) opens. The high-pressure chamber (9) extends axially between the bottom (7) of the pressure piston (3) and a base (10) of the housing (2), and the pressure pistons (3) arranged in the common housing (2) have a common reservoir.
摘要:
A switchable valve train for gas-exchange valves of internal combustion engines with a rocker arm device (1), in which a rocking motion about a rocker arm axis (3) can be introduced by at least one cam (2a, 2b), one tappet, or the like, wherein this rocking motion can be transmitted to at least one valve (4). The rocker arm device (1) is formed from at least one cam lever part (5) in working connection with the cam (2) and a valve lever part (6) in working connection with the valve (4), which are supported so that they can rock about the rocker arm axis (3). A coupling device is constructed between the cam lever part (5) and the valve lever part (6), in order to selectively engage and disengage the transmission of the rocking motion.
摘要:
A hydraulic cam follower (1) for the simultaneous actuation of several equal-acting gas-exchange valves is provided, especially for a tappet pushrod valve train of an internal combustion engine, and includes an outer part (2), whose base (3) forms or is at least indirectly connected to a cam contacting surface (4) and from whose head (5) hollow-cylindrical guides (6) extend in the same number as the equal-acting gas-exchange valves in a direction towards the base (3). Each guide (6) is formed by a cutting process, such as internal round reaming or internal round broaching, and a housing (7) of a hydraulic play compensation element (8) is provided in each guide with its outer casing (9) fine-machined by grinding, which housing (7) sits with its bottom side (10) on an inner side (11) of the bottom (3) of the outer part (2). A concentric pressure piston (14) is guided in a borehole (13) fine-machined by grinding starting from a head end (12) of each housing (7) with its outer casing (15), which is also fine-machined by grinding, so that it can move axially. A non-return valve (17) is located at a bottom-side base (16) of the pressure piston (14), and a high-pressure space (18) is formed axially between the base (16) and the bottom side (10) of the housing (7). A reservoir (20) for hydraulic medium is formed between the base (16) and a head end (19) of the pressure piston (14).