Abstract:
This invention proposes a poppet valve actuation system in which the poppet valve is operated, via a cam follower, by a cam, which has a shaft passing through it, concentric with the bearings that support the aforementioned cam, and the said cam being joined by (2) pivoted links to a connecting rod, driven by a crankshaft, the first link, referred to as the "cam link", being rotatably connected at one end of the link to the cam, whilst the other end of the first link connects rotatably to one end of the second link, this second link, referred to as "control link" being rotatably connected, along its length, to the small end of the said connecting rod, the other end of this second link, termed the "free" end, being connected, via an appropriate mechanical joint, to an actuator that may apply a displacement to this free end of the control link, such that the control link's angularity relative to the first link and therefore the angular displacement of the cam can be adjustably controlled by the said displacement of the free end of the control link causing rotation about the connection of the control link with the small-end of the said connecting rod, the big end of which being free to rotate on the said crankshaft, the said crankshaft being driven in appropriate phase with the main engine crankshaft, and said crankshaft being on a parallel and different axis to that of the aforementioned bearing support shaft that passes through the cam. The actuator may be electrically driven and controlled, in response to signals from a sensor on the poppet valve or actuator shaft, in feedback or feedforward mode.
Abstract:
This invention proposes a poppet valve actuation system in which the poppet valve is operated, via a cam follower, by a cam, which has a shaft passing through it, concentric with the bearings that support the aforementioned cam, and the said cam being joined by (2) pivoted links to a connecting rod, driven by a crankshaft, the first link, referred to as the "cam link", being rotatably connected at one end of the link to the cam, whilst the other end of the first link connects rotatably to one end of the second link, this second link, referred to as "control link" being rotatably connected, along its length, to the small end of the said connecting rod, the other end of this second link, termed the "free" end, being connected, via an appropriate mechanical joint, to an actuator that may apply a displacement to this free end of the control link, such that the control link's angularity relative to the first link and therefore the angular displacement of the cam can be adjustably controlled by the said displacement of the free end of the control link causing rotation about the connection of the control link with the small-end of the said connecting rod, the big end of which being free to rotate on the said crankshaft, the said crankshaft being driven in appropriate phase with the main engine crankshaft, and said crankshaft being on a parallel and different axis to that of the aforementioned bearing support shaft that passes through the cam. The actuator may be electrically driven and controlled, in response to signals from a sensor on the poppet valve or actuator shaft, in feedback or feedforward mode.
Abstract:
A variable valve actuation mechanism includes a control shaft (30) and a rocker arm (22). A second end of the rocker arm is connected to the control shaft. The rocker arm carries a roller (42) for engaging a cam lobe (12Aa) of an engine camshaft (12). A link arm (24) is pivotally coupled at a first end thereof to the first end of the rocker arm. An output cam (26a) is pivotally coupled to the second end of the link arm, and engages a corresponding cam follower (62a) of the engine. A spring (18) biases the roller into contact with the cam lobe and biases the output cam toward a starting angular orientation.
Abstract:
PROBLEM TO BE SOLVED: To provide a variably operated valve system that facilitates size management on a control shaft and of which the manufacturing work efficiency can be improved.SOLUTION: A variably operated valve system includes: a plane part 24 formed on an outer peripheral surface of a control shaft 19 and having raised opposite surfaces 24b, 24c cut from a shaft direction so as to hold a connection member 27 therebetween from a shaft direction; a bolt hole 25 bored from the plane part along a diameter direction through an oil passage 23, and having a female screw hole 25a formed on a tip side; and a restriction part comprising a cylindrical fitting groove 26 formed at an upper hole edge of the bolt hole of the plane part and a cylindrical fitting projection part 28 formed at a lower hole edge of a bolt insertion hole of the connection member and fitted in the fitting groove, the connection member being fixed to a control shaft by threadedly tightening a fixing bolt 19 in the bolt hole through the bolt insertion hole of the connection member.
Abstract:
PROBLEM TO BE SOLVED: To provide a continuous variable valve lift apparatus capable of varyingly forming an operation range and to provide a group of continuous variable valve lift apparatuses symmetric and having the same valve profile for being used in a V-type engine. SOLUTION: The continuous variable valve lift apparatus includes (a) an input cam formed on a camshaft and rotating, (b) a follower supporting portion formed on the camshaft for changing a relative angle with respect to the camshaft, (c) a follower that includes a center shaft, is connected with the follower supporting portion via the center shaft, and pivots around the center shaft by receiving rotation of the input cam, (d) a straight line guide, (e) an output cam contacting with the follower and reciprocating along the straight line guide and (f) a valve opening and closing unit opened and closed while contacting with the output cam. The follower supporting portion has a connecting portion and is connected with a cylinder head. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an actuator for a valve lift control device for controlling a valve lift quantity while keeping engine performance stably. SOLUTION: The actuator for a valve lift control device, linearly drives a control shaft in an axial direction, and comprises: first and second rotary cams integrally rotating around a common rotation center line by torque transmission; first and second contacts brought into contact with the first and second rotary cams; and a direct acting follower moving in a straight line together with the control shaft along with the first and second rotary cams. When the contact of a first rotary cam with the first contact is a first contact, and the contact of the second rotary cam with the second contact is a second contact, the first contact is opposite to the second contact across the rotation center line. The sum of a cam lift quantity h 1 of the first rotary cam at the first contact and a cam lift quantity h 2 of the second rotary cam at the second contact is approximately constant in predetermined rotation angle ranges of the first and second rotary cams. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a variable valve apparatus capable of preparing superior opening and shutting timing of engine valves while retaining suitable mountability.SOLUTION: In a variable valve apparatus for an internal combustion engine in which valves for one of suction air and exhaust gas can be driven with a swing cam 21 of an operating angle variable mechanism and the other valves are driven with a rotary cam 11, a camshaft 10 for driving one valves is formed as a double structure made from an outer shaft 13 and an inner shaft 14, and a relative phase of both shafts 13, 14 can be controlled with a phase control means 40 made from a cylindrical housing 41 fixed on the outer shaft 13, and a vane rotor 42 fixed on the inner shaft 14.
Abstract:
A hydraulically operated camshaft phasing mechanism has two lock pins. One of the lock pins engages at an intermediate position and an end lock pin engages near one of the stops at the end of the phaser range of authority. At least one of the locking pins, preferably the end lock pin, when the vane is at an end stop position, is engaged by oil pressure and spring loaded to release when the oil pressure side of the end lock pin is vented.