Abstract:
First and second sliding parts of a sliding mechanism slide relative to each other. The first sliding part is held in a recess of a metal holding member, which is bounded by an inner wall that meets an open end of the recess along an edge. The first sliding part has a first side surface portion that contacts the inner wall in the recess away from the edge, and a second side surface portion displaced inwardly away from the inner wall so as not to contact the holding member at the edge. By this structure, generation of stress concentration on the sliding part can be avoided.
Abstract:
A rocker arm (6) that can be uncoupled from the cam lift, the axle (11) of this rocker arm (6) is guided for longitudinal movement in a slot (12) of a pedestal (13), and the rocker arm (6) can be coupled to the pedestal (13) by locking elements (20, 21, 22) or it can be uncoupled from the pedestal (13) by these locking elements (20, 21, 22) for achieving a zero lift of an associated gas exchange valve (9).
Abstract:
The end portion of the side wall of the cylinder head where the rocker cover is attached is extended along the rocker cover, and the position of this end is set at a higher position than the position of the camshaft. The connector tube of the fuel injection nozzle is so formed that it extends obliquely downward at the upper part of the camshaft, facing onto outside from the through hole formed in the extension of the end of the side wall of the cylinder head, to be connected to the fuel supply pipe. Thereby, when the rocker cover is removed, works such as removing the fuel supply pipe from the connector tube and the like are not required, resulting the improvement of the workability. Furthermore, the capacity of the oil separator in the rocker cover can be sufficiently secured.
Abstract:
A mechanical valve lifter for an internal combustion engine comprises a head section having a recessed portion on an upper face thereof, a skirt section formed integral with the head section and adapted to be in sliding-contact with a lifter guiding bore in an engine cylinder head, a mechanical valve-clearance adjusting shim put in the recessed portion, an annular groove formed in an upper face of a bottom wall of the recessed portion of the lifter body, a first through-opening formed in the shim to communicate with the annular groove, and a second through-opening formed in the head section to communicate with the annular groove and to penetrate the head section. The annular groove and the second through-opening are formed in an essentially zero bending moment area midway between a central axis of the head section and a peripheral wall of the recessed portion.
Abstract:
A valve lifter has a lifter body with a first surface arranged to feet on a pair of low lift cams on a camshaft, and a pair of hydraulic slides disposed in a bore of the lifter body. The slides have a stored position wherein they define therebetween and within the bore a chamber arranged to allow entry of a high lift cam on the camshaft disposed between the pair of low lift cams. The lifter body is formed with a window opening to the chamber to allow access of the high lift cam to the chamber. The slides have an operative position wherein they define a second surface opposite to the window arranged to rest on the high lift cam.
Abstract:
Between the end of a valve and a valve-operating cam in an internal combustion engine, a valve lifter is inserted. A filler enclosing portion is formed between a shim and the body of the valve lifter. Through an opening from an injector, a filler is introduced into the filler enclosing portion, so that valve clearance is corrected to zero. Differences in valve clearance can be easily corrected.
Abstract:
Between the end of a valve and a valve-operating cam in an internal combustion engine, a valve lifter is inserted. A filler enclosing portion is formed between a shim and the body of the valve lifter. Through an opening from an injector, a filler is introduced into the filler enclosing portion, so that valve clearance is corrected to zero. Differences in valve clearance can be easily corrected.
Abstract:
The preset invention provides a ceramic adjusting shim capable of minimizing the abrasion of parts contacting the adjusting shim, for example, a cam and a tappet. The ceramic adjusting shim is produced from a ceramic material and has a surface roughness of 0.05 to 0.2 .mu.m in ten-point average roughness Rz.
Abstract:
The present invention provides an improved adjusting shim used in a valve train for an internal combustion engine for an automobile. The adjusting shim produced from a base material consisting of a ceramic material containing 80 to 98 wt. % of silicon nitride and/or sialon and has a porosity of not more than 3%, a bending strength of not less than 1.0 GPa and an impact compressive elastic limit (Hugoniot elastic limit) of not less than 15 GPa, wherein the base material is provided on the surface thereof which contacts a cam with a ceramic surface layer having a composition different from that of the base material and a hardness lower than that of the base material. The adjusting shim of the present invention enables a power loss of a valve train to be minimized; the abrasion resistance thereof to be improved; and the fuel economy, the performance and durability of an internal combustion engine to be improved.
Abstract:
A mechanical valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine, which valve tappet comprises a cup-shaped housing with a hollow cylindrical wall (1) closed at one end by a bottom (2) against which a control cam runs from the outside while an adjusting element (5) bears against the inner surface of the bottom by a first flat end face and is in contact with the end of a valve stem of a two-way gas valve by a second end face which is parallel to said first end face, characterized in that the adjusting element (5) is a solid component with a cylindrical outer peripheral surface and parallel end faces, projections being provided on the cup-shaped housing to cooperate with the cylindrical outer peripheral surface of the adjusting element so that the adjusting element (5) is retained by interlocking or by force engagement on the cup-shaped housing.