Advanced VTEC / Variable Valve Lift and Variable Cam Timing
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Advanced VTEC / Variable Valve Lift and Variable Cam Timing
To read complete patent read this http://www.google.com/patents?...68819
For summary read on
Patent number: 6968819
Filing date: Jan 5, 2005
Issue date: Nov 29, 2005
Inventors: Noriaki Fujii, Katsunori Nakamura, Keiko Yoshida, Hisao Sakai, Tadaharu Shoji, Motohiro Maruyama
Assignee: Honda Motor Co., Ltd.
Primary Examiner: Thomas Denion
Secondary Examiner: Ching Chang
Attorney: Armstrong, Kratz, Quintos, Hanson & Brooks, LLP
Current U.S. Classification
123/904.4; 123/903.9; 123/901.6; 123/902
International Classification
F01L001/18
To allow both the valve lift and valve timing for an engine valve to be varied in a continuous manner, the variable valve actuating device (1) comprises a camshaft (8) rotatably supported by a fixed part of the engine and provided with a cam (7), a first rocker arm (9) pivotally supported by a fixed part of the engine, the first rocker arm being provided with a first point (12) engaging a stem of an engine valve (6), a drum (11) rotatably supported by a fixed part of the engine and at least partly surrounding the cam, a second rocker arm (10) having a first point (20) pivotally supported by the drum, a second point (21) adapted to engage the cam and a surface engaged by a second point (22) of the first rocker arm, and a control member (25, 26) for selectively turning the drum over a prescribed angular range.
What is claimed is:
1. A variable valve actuating device for transmitting a cam lift to a valve lift at a variable ratio and by a variable phase relationship in an internal combustion engine, comprising:
a camshaft rotatably supported by a fixed part of the engine and provided with a cam;
a first rocker arm pivotally supported by a fixed part of the engine, the first rocker arm being provided with a first point engaging a stem of an engine valve;
a drum rotatably supported by a fixed part of the engine and at least partly surrounding the cam;
a second rocker arm having a first point pivotally supported by the drum, a second point adapted to engage the cam and a surface engaged by a second point of the first rocker arm; and
a control member for selectively turning the drum over a prescribed angular range.
2. A variable valve actuating device according to claim 1, wherein the engine valve consists of an intake valve.
3. A variable valve actuating device according to claim 1, wherein the drum and cam shaft are rotatably supported by a common camshaft holder in a coaxial relationship.
4. A variable valve actuating device according to claim 1, further comprising a gear formed around the drum, and the control member includes a pinion that meshes with the gear.
5. A variable valve actuating device according to claim 2, wherein the camshaft further comprises a cam for actuating an exhaust valve, and the drum is provided with an opening that exposes the cam for the exhaust valve
Taken from honda.com http://world.honda.com/news/2006/4060925VTEC/
Honda Develops Advanced VTEC Engine Combining High Power and Environmental Performance
September 25, 2006–Honda Motor Co., Ltd. has further advanced its VTEC (Variable Valve Timing and Lift Electronic Control System) technology with the development of the Advanced VTEC engine, which achieves high performance along with outstanding fuel economy and lower emissions. The new engine combines continuously variable valve lift and timing control with the continuously variable phase control of VTC (Variable Timing Control). Honda plans to release a production vehicle equipped with the new engine within three years.
This new system permits optimum control over intake valve lift and phase in response to driving conditions, achieving improved charging efficiency for a significant increase in torque at all engine speeds. Under low to medium load levels, the valves are set for low lift and early closure to reduce pumping losses and improve fuel economy.
In combination with optimized intake components, these advances in control technology result in world-class dynamic performance along with approximately 13%* improvement in fuel economy. The new engine is also exceptionally clean, with exhaust emissions that meet both U.S. Environmental Protection Agency LEV2-ULEV regulations and Japanese Ministry of Land, Infrastructure and Transport requirements for Low-Emission Vehicles, with emission levels 75% lower than those required by the 2005 standards (based on Honda calculations).
For summary read on
Patent number: 6968819
Filing date: Jan 5, 2005
Issue date: Nov 29, 2005
Inventors: Noriaki Fujii, Katsunori Nakamura, Keiko Yoshida, Hisao Sakai, Tadaharu Shoji, Motohiro Maruyama
Assignee: Honda Motor Co., Ltd.
Primary Examiner: Thomas Denion
Secondary Examiner: Ching Chang
Attorney: Armstrong, Kratz, Quintos, Hanson & Brooks, LLP
Current U.S. Classification
123/904.4; 123/903.9; 123/901.6; 123/902
International Classification
F01L001/18
To allow both the valve lift and valve timing for an engine valve to be varied in a continuous manner, the variable valve actuating device (1) comprises a camshaft (8) rotatably supported by a fixed part of the engine and provided with a cam (7), a first rocker arm (9) pivotally supported by a fixed part of the engine, the first rocker arm being provided with a first point (12) engaging a stem of an engine valve (6), a drum (11) rotatably supported by a fixed part of the engine and at least partly surrounding the cam, a second rocker arm (10) having a first point (20) pivotally supported by the drum, a second point (21) adapted to engage the cam and a surface engaged by a second point (22) of the first rocker arm, and a control member (25, 26) for selectively turning the drum over a prescribed angular range.
What is claimed is:
1. A variable valve actuating device for transmitting a cam lift to a valve lift at a variable ratio and by a variable phase relationship in an internal combustion engine, comprising:
a camshaft rotatably supported by a fixed part of the engine and provided with a cam;
a first rocker arm pivotally supported by a fixed part of the engine, the first rocker arm being provided with a first point engaging a stem of an engine valve;
a drum rotatably supported by a fixed part of the engine and at least partly surrounding the cam;
a second rocker arm having a first point pivotally supported by the drum, a second point adapted to engage the cam and a surface engaged by a second point of the first rocker arm; and
a control member for selectively turning the drum over a prescribed angular range.
2. A variable valve actuating device according to claim 1, wherein the engine valve consists of an intake valve.
3. A variable valve actuating device according to claim 1, wherein the drum and cam shaft are rotatably supported by a common camshaft holder in a coaxial relationship.
4. A variable valve actuating device according to claim 1, further comprising a gear formed around the drum, and the control member includes a pinion that meshes with the gear.
5. A variable valve actuating device according to claim 2, wherein the camshaft further comprises a cam for actuating an exhaust valve, and the drum is provided with an opening that exposes the cam for the exhaust valve
Taken from honda.com http://world.honda.com/news/2006/4060925VTEC/
Honda Develops Advanced VTEC Engine Combining High Power and Environmental Performance
September 25, 2006–Honda Motor Co., Ltd. has further advanced its VTEC (Variable Valve Timing and Lift Electronic Control System) technology with the development of the Advanced VTEC engine, which achieves high performance along with outstanding fuel economy and lower emissions. The new engine combines continuously variable valve lift and timing control with the continuously variable phase control of VTC (Variable Timing Control). Honda plans to release a production vehicle equipped with the new engine within three years.
This new system permits optimum control over intake valve lift and phase in response to driving conditions, achieving improved charging efficiency for a significant increase in torque at all engine speeds. Under low to medium load levels, the valves are set for low lift and early closure to reduce pumping losses and improve fuel economy.
In combination with optimized intake components, these advances in control technology result in world-class dynamic performance along with approximately 13%* improvement in fuel economy. The new engine is also exceptionally clean, with exhaust emissions that meet both U.S. Environmental Protection Agency LEV2-ULEV regulations and Japanese Ministry of Land, Infrastructure and Transport requirements for Low-Emission Vehicles, with emission levels 75% lower than those required by the 2005 standards (based on Honda calculations).
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