Abstract:
The invention concerns a rocker or idler arm (1) for the timing gear of an internal combustion engine, the rocker or idler arm having at one end a cup-shaped recess (2) by means of which it is mounted so as to pivot with respect to a spherical end (4) of a support element (3), while its other end is operatively connected to a gas-exchange valve (5). According to the invention, the spherical end (4) of the support element (3) and/or the cup-shaped recess (2) of the rocker or idler arm (1) have (has) a contact face comprising more than 10 % carbide. In this way, the timing gear is rendered particularly wear-resistant.
Abstract:
A follower (18) for translating rotational motion of a cam (22) into reciprocal motion of an intake or exhaust valve is disclosed. The follower comprises a first portion (44) adapted to be pivotably mounted on a follower shaft and a second portion (46) adapted to contact a cam surface. The first and second portions form a generally V shape. The first portion includes a bottom (48) and a pair of side walls (50, 52) connected to the bottom. Each of the side walls has a hole (56, 58) therethrough, and the holes are coaxially aligned to accept the follower shaft. The second portion includes a first end (66) connected to the first portion and a second distal end (70) which contacts the cam surface. Also disclosed is a method of making a follower from common sheet metal.
Abstract:
A bearing support member (28) and bearings (34) form a subassembly that can be inserted, in the direction of the axis of the bearings (34), into a bore of a rocker arm (26). A support stud (30) can then be passed through an aperture (56) in the rocker arm and a bore (32) in the bearing support member (28) so as to engage the rocker arm (26) and maintain alignment of the rocker arm (26) and bearings (34). Also disclosed are an inner sleeve (42) and particular configuration of the bearing support member (28) to facilitate manufacture of the bearing support member (28) by powdered metal forming.
Abstract:
The rocker for a valve of a combustion engine (1; 101; 201) comprises a lever arm (2; 102; 202) arranged in parallel to the longitudinal axis of the rocker (3; 103; 203). On a side face of said lever arm there is fixed an element for adjusting the valve clearance (4; 104; 204) orientated according to the longitudinal axis (3; 103; 203) of the rocker (1; 101; 201).
Abstract:
The invention relates to an operating lever for a valve operating mechanism of an internal combustion engine, whereby said lever at the end situated on the valve side has a sliding shoe located between itself and a valve stem end of a gas exchange valve. The operating lever is characterized in that it is configured as a piece of sheet metal worked without cutting, which in the area (2) situated on the side of the valve has a lower wall (12) linked to two side walls (5, 6) in such a way that they form a U shape open at the top. Said lower wall (12) has a recess (13) that is open at the bottom and designed to accommodate the sliding shoe (14), which is held inside the recess (13) in such a way that it cannot slip out. The dimensions of the sliding shoe (14) and recess (13) are matched in such a way that the sliding shoe (14) can freely swivel within the cavity (13) in relation to the displacement of the valve stem (11).
Abstract:
The aim of the invention is to design a simple longitudinal-position fixation for a rocking arm (2, 9) on a pivot axis designed as a shaft (8). The invention achieves this by calling for part of the shaft (8), which is surrounded by a bore (7) in the rocking arm (2, 9), to have an annular groove (10) in which a spring ring (13) is located, the outer part (12) of the spring ring being located in a recess (14) having the shape of a groove (13) running round the bore (7) in the rocking arm (2, 9).
Abstract:
The present invention provides a rocker arm assembly for an internal combustion engine comprising an elongate rocker arm having a pushrod engaging portion proximate one end, a valve stem engaging portion proximate its other end, and a socket-forming recess inbetween the ends with an aperture therethrough, retaining stud means extending through the aperture, part-ball-means retained on the stud means within the socket-forming recess forming with the recess a ball-in-socket type coupling of the rocker arm and stud means for relative articulated movement, the improvement wherein a plurality of ball bearings are arranged in a part spherical array to bear loading beteeen the recess and the part-ball means. By providing either of the recess or the part-ball member with a part spherical bearing surface, the ball bearings may be coupled to the other in a spherical array. Preferably, the ball bearings may be carried in a ring-like frustospherical raceway to protrude from both inwardly and outwardly directed surfaces of the raceway into engagement with frustospherical bearing surfaces both formed in the recess and on the part-ball member.
Abstract:
A roller rocker arm used in a valve driving system for an engine and consisting of a sheet metal. The arm consists of a rocker arm body (11) having a pair of sidewalls (11c) and a connecting member (12) by which the sidewalls (11c) are joined together unitarily, a roller member (7) provided between the two sidewalls (11c), a pivotal locking member (12a) formed on the connecting member (12) so as to project therefrom, and a valve locking member (14) provided between the end portions of the sidewalls (11c) which are at the opposite side of the connecting member (12). Therefore, a satisfactorily high rigidity of the rocker arm can be secured, and this rocker arm is suitable for the mass production thereof, the reduction of the cost of manufacturing the same becoming easy.
Abstract:
The variable valve operating mechanism (48) comprises lower and upper rocker arms (76a, 76b), each having a straight section (82) and a curved cam section (84). The lower rocker arm (76a) is mounted for pivotal movement about a fixed axis (70) and the upper rocker arm is mounted for pivotal movement about a shiftable axis (138). The free end (80) of the lower rocker arm (76a) engages the valve (24) to be actuated and the free end (80) of the upper rocker arm (76b) engages the straight section (82) of the first rocker arm (76a) when the shiftable axis (138) is spaced relatively far from the fixed axis (70). When the shiftable axis (138) is moved toward the fixed the axis (70), the valve (24) lift starts to increase. Continued movement, however, causes the engine's cam (40) to engage the curved cam section (84) of the upper rocker arm (76b) to lengthen the duration or time that the valve (24) is open. In this way, valve lift and the duration of time that the valve (24) remains open can be controlled in accordance with certain engine operating conditions. Provisions is made for lubricating parts of the mechanism and provision is also made for adjusting certain parts of the mechanism so as to provide a specified amount of valve lash.
Abstract:
The internal combustion engine includes a cast cylinder head having as-cast alignment ribs (26, 28) that align a squared-off fulcrum (56) in the rocker assembly. The rocker arm (42) also has two substantially flat surfaces that engage the planar sides of the fulcrum (56) to minimize lateral movement of the rocker arm (42). The fulcrum (56) is received between the cast alignment ribs (26, 28). The ribs are biased from a major axis to insure proper fulcrum alignment during assembly without the use of a jig.