摘要:
The invention concerns a cam follower (1), comprising: a tappet (10) which includes two flanges (21, 22) provided with opposite holes (23, 24) centered on a transverse axis (X1); a pin (30) extending along the transverse axis (X1) between two opposite ends (33, 34) received in the opposite holes (23, 24); and a roller (40) movable in rotation relative to the pin (30) around the transverse axis (X1) and adapted to roll on a cam. According to the invention, each of the opposite holes (23, 24) is provided with: an open portion (231, 241) for mounting the pin (30) by translation in a first direction (D1) perpendicular to the transverse axis (X1), a cylindrical portion (233, 243) for supporting the pin (30) along the first direction (D1) and a plane portion (235, 245) for retaining the pin (30) along the transverse axis (X1) during transport and mounting of the cam follower (1). The invention also concerns a method for manufacturing such a cam follower (1).
摘要:
An internal combustion engine has a valvetrain that includes a rocker arm assembly on which is mounted an electronic device and at least a part of a generator. The generator converts some of the mechanical energy that is transmitted through the rocker arm assemblies into electricity. That electricity may be used to power an electric latch, a transmitter, or another type of rocker arm assembly-mounted electrical device. Various generator configurations are described. In some configurations, the generator is piezoelectric. In other configurations, the generator is electromagnetic. In some configurations, the generator is driven by force transmitted by the rocker arm assembly from a cam. In some configurations, the generator is driven by vibrations.
摘要:
A hydraulic lash adjuster having a reduced number of elements, yet capable of suppressing air from infusing into a high-pressure chamber (28). A plunger (14) is slidably fitted in a body (13). A reservoir (24) is formed in the plunger (14). The plunger's head portion (19) is formed with a communication hole (25) for communicating its interior with its exterior. A high-pressure chamber (28) is formed in the body (13) and between the plunger's bottom (20) and the bottom of the body (13). An oil supply hole (40) is formed in the peripheral wall (21) of the plunger. A valve mechanism (42) is provided at the plunger's bottom (20), between the body (13) and the plunger (14) via a return spring (41). Provided on the inner periphery of the plunger (14) is an inclined area (51b), subjected to impingement of oil jet ji ejected from the oil supply hole (40) and serving as an impingement area, such that the impingement area (51b) is more inclined to fall in the direction of the ejected oil as the inclined area (51b) nears the plunger's head portion (19).
摘要:
A cam follower for operable attachment to a valve lifter assembly for use with a variable cam lobe camshaft in a variable valve timing system includes a housing with a central cavity and a mushroom head with a stem pivotably connected to the housing in the central cavity, the mushroom head having a radiused surface for contacting a cam lobe surface. The cam follower is used in combination with a variable cam surface of an axially displaceable camshaft to obtain improvements in idling speed and volumetric efficiency.
摘要:
In an internal combustion engine comprising two or more engine valves that receive valve actuation motions from a valve actuation motion source via a valve train, which valve train comprises a hydraulic lash adjuster, an apparatus for valve actuation comprises a valve bridge and a lost motion assembly disposed therein. The lost motion assembly comprises a first piston disposed in a first piston bore formed in the valve bridge. The first piston is configured to operatively connect with a component of the valve train. A biasing element is configured to bias the first piston out of the first piston bore with a first force that is greater than a second force applied to the first piston by the hydraulic lash adjuster. A travel limiter is configured to limit travel of the first piston out of the first piston bore to be no greater than a maximum lost motion distance.
摘要:
The cam follower roller device comprises a tappet body 12, an insert 18 mounted in the tappet body and provided with a central core 24 and with at least two side tabs 26, 28, a pin 14 mounted at least on the tabs of the insert, and a roller 16 mounted on said pin. The insert 18 8 further comprises at least one stiffener 44, 46 disposed between the core 24 and each tab 26, 28.
摘要:
The invention relates to a roller device including a pin (10), a roller (12) supported by said pin (10) and tappet (14) configured to support said pin (10) in supporting bores (14d, 14e) provided in lateral flanges (14b, 14c) of said tappet (14), wherein at least one end face of said pin (10) is configured to be plastically deformed using a caulking tool 16 in order to lock said pin (10) within the pertinent bore (14d, 14e). It is proposed that said at least one end face is of the pin (10) is provided with a recess (10c, 10d) configured to facilitate said plastic deformation.
摘要:
The invention concerns a cam follower (1) comprising a tappet (10) having a cylindrical outer surface (14) centered on a longitudinal axis (Y1) and adapted to slide in a housing (2) surrounding the tappet, a pin extending between two opposite ends along a transverse axis (X1) perpendicular to the longitudinal axis, and a roller element movable in rotation relative to the pin around the transverse axis and adapted to roll on a cam. The tappet (10) is made of a composite material integrating at least one dry lubricant released at the cylindrical outer surface (14) when the cam follower (1) is in operation. The invention also concerns an injection pump and a valve actuator for a motor vehicle, each comprising such a cam follower (1). The invention also concerns a method for manufacturing such a cam follower (1).