摘要:
A valve system of an overhead-camshaft-type internal combustion engine includes a cam holder fastened to a cylinder head having a combustion chamber formed therein. The cam holder supports a camshaft, and is disposed above the combustion chamber. The cam holder includes a bottom wall, a pair of oppositely-facing support walls having lower sides thereof joined with each other by the bottom wall, and a rib joining predetermined oppositely-facing portions of respective upper side portions of the support walls with each other. The support walls of the cam holder pivotally support the cam shaft. The rib may be integrated with the cam holder, or may be separately formed and fastened to the support walls of the cam holder.
摘要:
A liquid-cooled engine provided with cooling means for cooling an area surrounding a combustion chamber using a cooling liquid cooled by a radiator and caused to flow through a cooling passage. The cooling passage is embedded inside a cylinder block and a cylinder head. The cooling passage is formed in a continuous fashion such that the cooling liquid is introduced from the radiator to cool an area surrounding the combustion chamber, and thereafter returns to the radiator by looping around an area surrounding an exhaust valve for opening and closing an exhaust port of the combustion chamber.
摘要:
A lubrication apparatus of a fuel pump, which lubricates a tappet and a fuel pump drive cam of the fuel pump, may include a cylinder head having an oil gallery formed therein and a camshaft disposed therethrough, wherein the fuel pump is coupled to the cylinder head, and a penetrating passage penetrating the cylinder head and connected to the oil gallery to supply oil from the oil gallery to the inside of a fuel pump adaptor connected to the fuel pump.
摘要:
A camshaft assembly may include a first shaft adapted to be rotationally driven, a first lobe member fixed for rotation with the first shaft, and a torsional damper fixed to the first shaft. The torsional damper may include a mass structure fixed to the first shaft and an elastic member disposed between and coupling the mass structure and the first shaft. The elastic member may have a spring constant providing a first sideband natural frequency and a second sideband natural frequency for the camshaft assembly.
摘要:
An engine assembly may include an engine structure, a first camshaft housing assembly and a first camshaft assembly. The first camshaft housing assembly may be supported by the engine structure and have a first portion providing a first plurality of bearing support surfaces on a first side and a second portion coupled to the first portion and providing a second plurality of bearing support surfaces on a second side opposite the first side. The first camshaft assembly may be rotationally supported by the first camshaft housing assembly and arranged between the first portion and second portion.
摘要:
A camshaft apparatus includes rolling bearings which support a camshaft rotatably, whereby a reduction in torque when an engine is started or is running at low speeds, a reduction in vibration of the camshaft and an extension of the lives of the bearings can be realized. In the rolling bearings, one rolling bearing is made to constitute a main ball bearing which restrains an axial relative movement of the camshaft relative to a shaft case, and the other rolling bearings are made to constitute a plurality of needle roller bearings, whereby a mechanical movement of the camshaft in an axial direction can be restricted in an ensured fashion by the main ball bearing. As to relative displacements due to thermal expansion or contraction of the camshaft and/or the shaft case, an axial relative displacement can be absorbed by needle rollers relatively moving on inter-cam outer circumferential surface areas.
摘要:
A cam cap has a wall portion that extends between two cam cap portions integrally formed and having connection portions respectively, and therefore the rigidity of the cam cap is high and thus the relative positional accuracies of oil passage connection faces of the connection portions are high even after the cam cap is mounted on an internal combustion engine.
摘要:
A camshaft may include a first shaft, a bearing sleeve member located on and fixed to the first shaft, and a first lobe member located on the first shaft and displaceable between first and second positions. The first lobe member may be axially offset relative to the bearing sleeve member when in the first position to allow for machining of an outer surface of the bearing sleeve member and removal of machining debris from the outer surface. The first lobe member may be axially aligned with and bearingly supported on the bearing sleeve member when in the second position.
摘要:
An internal combustion piston engine based on a four-stroke process, including a crankcase in which at least one cylinder/piston assembly is arranged, the piston being guided by a connecting rod connected to a crankshaft. At least one cylinder head closes the cylinder, each of whose intake and exhaust channels are controlled by at least one intake valve and one exhaust valve (13, 13a). The intake and exhaust valves (13, 13a) are actuable by a rocker arm (5) or a finger lever driven by a camshaft (1) through intake and exhaust cams (2). The rocker arms or finger levers are guided on at least one axle (6). A brake control device is provided which includes, in the region of the base circle of the exhaust cam (2), at least one additional cam (1) for an additional opening of at least one of the exhaust valves (13, 13a). A control element (12, 12a) is installed between the rocker arm (5) or finger lever and the exhaust valve or valves (13, 13a), which control element (12, 12a) can be connected to the pressurized oil circulation system of the internal combustion piston engine and whose length can be varied, so that the additional cam (3) is active during a braking operation and inactive during a pure engine operation. The control element (12) is arranged in a bridge (11) that is associated with a plurality of exhaust valves (13, 13a).
摘要:
A lost motion engine valve actuation system and method of actuating an engine valve are disclosed. The system may comprise a valve train element, a pivoting lever, a control piston, and a hydraulic circuit. The pivoting lever may include a first end for contacting the control piston, a second end for transmitting motion to a valve stem and a means for contacting a valve train element. The amount of lost motion provided by the system may be selected by varying the position of the control piston relative to the pivoting lever. Variation of the control piston position may be carried out by placing the control piston in hydraulic communication with a control trigger valve and one or more accumulators. Actuation of the trigger valve releases hydraulic fluid allowing for adjustment of the control piston position. Means for limiting valve seating velocity, filling the hydraulic circuit upon engine start up, and mechanically locking the control piston/lever for a fixed level of valve actuation are also disclosed.