Abstract:
A method and apparatus for resetting a valve lift for use in an engine brake. A brake piston (160), and a hydraulic fluid passage (214) are arranged within a rocker arm (210) or a valve bridge (400) of an engine. A resetting valve arranged between the rocker arm (210) and the valve bridge (400) is driven by a change in the distance between the rocker arm (210) and the valve bridge (400). When the valve lift of an engine exhaust valve (300) reaches a maximum, a reset fluid passage (219) is opened, the hydraulic pressure within the hydraulic fluid passage is released, the brake piston (160) is reversed by one interval, the motion transmission between a cam (230) and the engine exhaust valve (300) is partially disengaged, and the valve lift of the engine exhaust valve (300) is reduced. Also, during a returning process of the valve lift of the engine exhaust valve (300) after reaching the maximum position, repositioning of the reset valve is used to maintain a supply of pressure within the hydraulic fluid passage, the brake piston (160) is allowed to be positioned at an extended position, and the motion transmission between the cam (230) and the engine exhaust valve (300) is resumed. The apparatus for resetting the valve lift can be integrated within an engine exhaust valve brake, and is structurally simple, convenient to install and to adjust, thereby improving safety and reliability.
Abstract:
A cam follower assembly is provided including an improved lubricant flowpath. The assembly includes a generally cylindrical housing including an annular groove adapted to be in communication with a lubricant gallery in an engine block or cylinder head. An axial end of the housing includes skirt portions including openings, and one of the skirt portions includes a first recessed section indented from an outer lateral surface of the housing and extending axially between the annular groove and a respective one of the openings. A pin is mounted in the openings of the skirt portions and has a second recessed section indented from an outer lateral surface of the pin that extends to at least one of the ends of the pin. The second recessed section is in communication with the first recessed section, and a cam roller supported on the pin.
Abstract:
A variable valve gear for adjusting inlet or exhaust valves of at least two cylinder banks of an internal combustion engine comprising a camshaft carrying cams, at least two pushrods for the transmission of a profile of the cams into a translatory movement for the actuation of inlet or exhaust valves, wherein a rotatable adjusting member is provided between the outside contour of the cam and the pushrod, wherein the actuating times of the inlet or exhaust valves on the at least two cylinder banks can be synchronously altered by rotation of the adjusting member.
Abstract:
An engine system is disclosed. The engine system may have an engine block that at least partially defines a cylinder bore, and a cylinder liner disposed within the cylinder bore. The engine system may also have at least one air intake port radially formed within the cylinder liner, a piston slidingly disposed within the cylinder liner and configured to open and close the at least one air intake port, a cylinder head configured to close off an end of the cylinder liner and form a combustion chamber, and at least one exhaust valve disposed within the cylinder head. The engine system may further have a valve actuation system configured to cyclically move the at least one exhaust valve between open and closed positions, and a variable timing device configured to selectively interrupt cyclical movement of the at least one exhaust valve to change a compression ratio of the engine system.
Abstract:
A tappet (1) for a reciprocating-piston combustion engine, which is situated within a tappet guide of a component fixedly attached to the engine, and having a bearing-mounted roller (8) guided on a pin (3), which roller is in active contact with a cam or an eccentric of a shaft of the reciprocating-piston combustion engine. The casing surface of the cam or eccentric is implemented axially parallel to the shaft and the roller (8) is guided so as to oscillate on the pin (3).
Abstract:
A cylinder structure satisfies the following conditions: 12%≦d/a≦27%, where d is a distance between a cylinder inner surface 12a and an exhaust valve member 20b, and a is a diameter of the exhaust valve member; 40%≦c/b≦50%, where c is a length of a non-guided portion of the exhaust valve 20 located below a lower end of a sleeve 26 when the exhaust valve 20 is closed, and b is a diameter of a cylinder bore; and 0.5%≦e/S≦0.8%, where e is a gap between an exhaust valve rod 20a and the sleeve 26 and S is a diameter of the exhaust valve rod 20a.
Abstract translation:气缸结构满足以下条件:12%≦̸ d / a≦̸ 27%,其中d是气缸内表面12a和排气阀构件20b之间的距离,a是排气阀构件的直径; 40%≦̸ c / b≦̸ 50%,其中c是当排气门20关闭时位于套筒26的下端下方的排气门20的非引导部分的长度,b是直径 气缸孔; 和0.5%≦̸ e / S≦̸ 0.8%,其中e是排气阀杆20a和套筒26之间的间隙,S是排气阀杆20a的直径。
Abstract:
The present disclosure provides a button for a rocker arm assembly. The button includes a head portion. The button includes a shank extending from the head portion along a longitudinal axis. The button further includes a base portion extending from the shank. The base portion has a bottom surface, wherein the bottom surface has a substantially concave profile.
Abstract:
An engine assembly may include an engine structure, a camshaft, a timing wheel and a camshaft position sensor. The camshaft may be rotationally supported within the engine structure and may have a non-magnetic journal rotationally fixed thereto. The timing wheel may be rotationally fixed to the camshaft proximate the non-magnetic journal. The camshaft position sensor may be coupled to the engine structure and configured to determine the rotational position of the camshaft based on a magnetic impulse from the timing wheel.
Abstract:
A four-cycle engine has an engine block having a cylindrical bore and an enclosed oil reservoir. Lubrication oil is inhaled from the oil reservoir and splashed to lubricate inner parts of the engine. The engine is provided with a cylinder head assembly having a pair of overhead intake and exhaust valves. Reciprocating intermediate lifters are provided between push rod and cam flowers to actuate the valve train. A push rod chamber communicated with the valve chamber is partitioned from the cam chamber and flowing of excess oil from the cam chamber into the valve chamber is prevented. Length of valve train push is shortened and it makes design of high speed engine properly.
Abstract:
An internal combustion engine for a vehicle, such as a motorcycle, includes a crankcase defining a sump, and a lubrication system scavenging oil from the crankcase and supplying oil to the crankshaft and to first and second cylinder heads. The lubrication system includes a pump with housing and rotor, the housing being fixed to the crankcase and the rotor being rotatable around a crankshaft axis and being rotated by the crankshaft. A plurality of oil supply passages extend through the crankcase, potentially including at least one being formed in the crankcase.