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ROCKER ARM or ROCKER ARMS
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Technical Examples
- 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.
- A sheet metal rocker arm of the welded and brazed tube and "boat type" rocker arm formed from sheet metal and characterized by having a reinforcing cross member which is integrally formed from a tab created by slitting the tube insert and which yields a unitary structure that introduces substantially greater stiffness to the rocker arm. The tube may be optionally rolled from sheet metal or by using seamless tubing. The method of creating integrally formed reinforcing cross-members by appropriate lancing slits in the sheet metal can be applied to any stamped rocker arm that has a U-channel architecture, e.g., including, for example, rocker arms for pushrod type valve trains as well as roller finger follower type rocker arms. Provision of the integrally formed cross member renders stiffness to the rocker arm that enables an engine to operate at a higher rpm and thereby to produce more horsepower.
- In a shifting device (2) for a multi-step transmission, several shift couplings are arranged one behind another, each with a shifting sleeve, can alternately be engaged in each case, via a shift rocker arm (4, 6, 8, 10), in that first form enclosed elements (30, 32, 34, 36) are arranged on a swivelling and axially movable selector and gearshift shaft (24) in such manner that at predetermined swivel angles of the selector and gearshift shaft (24) in each case only one first form enclosed element (30, 32, 34, 36) cooperates with one second form enclosing element (38, 40, 42, 44) which is arranged on a shift rocker arm (4, 6, 8, 10), and in that via an axial displacement of the selector and gearshift shaft (24), the appropriate shift rocker arm (4) is actuated while during its actuation, the other shift rocker arms (6, 8, 10) are locked in their neutral position by a locking device, the locking device comprises a locking sleeve (66, 74, 82, 86) which is provided on the selector and gearshift shaft (24) for respective pairs of shift rocker arms (4, 6, 8, 10) and is connected rotationally fast to the selector and gearshift shaft (24) but can move axially on the selector and gearshift shaft (24) and, on each shift rocker arm (4, 6, 8, 10), there are arranged first locking member (50, 52, 54, 56) which cooperate with the locking sleeve (66, 74, 82, 86) and with second locking member (58, 60) in fixed arrangement in the transmission.
- A rocker switch assembly has several rocker shells that define cavities to receive inserts of several varieties that allow the user to provide several rockers in a side-by-side assembly of rocker switches with a wave pattern that allows each switch to be easily identified as to function and/or indicates switch condition. Reversing the orientation of every other rocker shell provides the wave pattern, and the use of different inserts allows variation in the illumination level of individual rocker switches, yet each rocker shell shares a common geometry.
- This variable valve train has a camshaft, a rocker shaft, and a rocker arm mechanism for transmitting a motion of a cam formed on the camshaft to a valve. The rocker arm mechanism includes a first arm which drives the valve, a second arm, a third arm, and a variable mechanism which rocks the rocker shaft. The first arm is rockably supported on the rocker shaft. The second arm is driven by the cam and rocks around a universal joint as a pivot on the side of the rocker shaft. The third arm is displaced to drive the first arm as the second arm rocks.
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