Abstract:
A variable valve characteristic mechanism has a valve operation cam pivotally supported on a camshaft and a driving mechanism rocking an interlocking mechanism around the camshaft, the interlocking mechanism rocking the valve operation cam by a driving cam integrated into the camshaft. The engine valve starts to open and close in a damping portion of the valve operation cam, and the driving mechanism rocks the valve operation cam via the interlocking mechanism, thereby controlling an opening timing and a closing timing of the engine valve. A cam swelled portion of the driving cam has a constant velocity portion in which a lift velocity is constant, and the constant velocity portion is provided over an angular width where the opening timing in a most advanced angle position of the opening timing of the engine valve and the opening timing in a most retarded angle position of the opening timing are included.
Abstract:
An adjustable camshaft sprocket assembly includes a hub and a sprocket body secured to the hub. A stud-receiving opening is defined in one of the hub flange and the sprocket body, and a tool-receiving opening is defined in the other of the hub flange and the sprocket body. The tool-receiving opening is aligned with the stud-receiving opening is adapted to receive a body portion of an adjustment tool, and the stud-receiving opening is adapted to receive an eccentric stud of the adjustment tool. Either the stud-receiving opening or the tool-receiving opening is elongated. Rotation of the adjustment tool when its body is located in the tool-receiving opening and its eccentric stud is located in the stud-receiving opening causes relative angular movement between the hub and the sprocket body. One or more fasteners are used to immovably secure the sprocket body to the hub after adjustment. A tool includes cylindrical base, a driving head, and an eccentric stud. The stud comprises a spring pin press-fit into a bore.
Abstract:
Rotary valve system for controlling communication with a port in an internal combustion engine which, in one disclosed embodiment, has a crankshaft, compression and expansion pistons connected to the crankshaft for reciprocating movement within compression and expansion chambers, a combustion chamber in which air from the compression chamber is combined with fuel and burned to produce an increased gas volume. The valve system has an outer valve member which is rotatively mounted in a bore and has an opening which moves into and out of communication with the port as the outer valve member rotates, an inner valve member rotatably mounted within the outer valve member with an opening at least partly overlapping the opening in the outer valve member, a flange extending along one edge of the opening in the inner valve member and through the opening in the outer valve member for sealing engagement with the wall of the bore, and means for effecting rotation of the valve members to change the degree of overlap between the openings and thereby control the timing and duration of communication between the openings and the port.
Abstract:
A cam sprocket 211 is driven to rotate by the drive force transmitted from a crankshaft 130 to by turn drive an eccentric plate 250 around an axis running in parallel with the axis of rotation of the cam sprocket 211. The eccentric plate 250 is movable from a position concentric with the cam sprocket 211 to an eccentric position. As it is driven to rotate at the eccentric position, it drives an intake cam block 240 by way of a variable camshaft 230 with a rotary phase difference that changes periodically relative to the cam sprocket 211. The intake cam block 240 drives an intake valve. The phase angle of the eccentric plate 250 at the connection section with the cam sprocket 211 and at the connection section with the movable camshaft 230 is s defined to be between 80° and 160° or between 200° and 290° when the direction in which the eccentric plate 250 rotates is assumed to be the forward direction.
Abstract:
A method for an internal combustion engine that reduces the possibility of misfire during transitions between a lower valve lift mode and a higher valve lift mode.
Abstract:
A method for controlling an engine having both an electronically controlled inlet device, such as an electronic throttle unite, and an electronically controlled outlet device, such as a variable cam timing system is disclosed. The method of the present invention achieves cylinder air charge control that is faster than possible by using an inlet device alone. In other words, the method of the present invention controls cylinder air charge faster than manifold dynamics by coordination of the inlet and outlet device. This improved control is used to improve various engine control functions.
Abstract:
A method for controlling valve timing for and engine having adjustable valve timing is presented. In one embodiment, the method allows the intake valve timing to be controlled with respect to exhaust valve timing or the method allows the exhaust valve timing to be controlled with respect to intake valve timing. In addition, the method can bound valve overlap between upper and lower limits so that engine emissions and fuel economy may be improved.
Abstract:
A sintered sprocket for a silent chain is obtained from a material with few addition elements by a simple densifying method. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and balance of Fe and other inevitable impurities by mass and has a density of 7.1 Mg/m3 or higher, 65 HRA or higher as a hardness in the gear teeth, and a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.
Abstract translation:用于无声链的烧结链轮通过简单的致密化方法从具有少量添加元素的材料获得。 烧结链轮由含有1〜2%的Cu,0.5〜0.8%的C,0.10%以下的不可避免的杂质的Mn,以及Fe等不可避免的杂质和/ 作为齿轮齿的硬度的密度为7.1Mg / m 3以上,65HRC以上的密度,作为横截面微观结构的马氏体,索氏体,贝氏体或它们的混合结构 至少在齿轮齿和齿轮齿的周边区域。
Abstract:
A device (1) for changing the timing of an internal-combustion engine (2) is provided that has a camshaft adjuster (5), which is supported on a non-rotating bearing journal (6). A driving wheel (8) of the camshaft adjuster (5) is driven by a crank-shaft (3) via a first traction mechanism drive (7). The rotation of the driving wheel (8) is transferred via an actuator (10) to a driven part (9), which is arranged so that it can rotate relative to the driving wheel (8). Second and third traction mechanism drives (11, 12) create a drive connection between the driven part (9) and two camshafts (4, 4a).
Abstract:
An apparatus for and method of installing a drive chain (201) uses one or more restraints (101) that do not interfere with drive chain function in an operating engine nor fall off during installation. One or more restraints (101) near a sprocket (207) attached to the crankshaft or other device facilitate installation of one or more drive chains (201) during engine assembly by limiting the movement of the drive chain (201) away from the sprocket (207).