Variable valve mechanism
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsToshiaki Asada, Shuichi Ezaki, Manabu Tateno
Life of this patent
Estimating the term…
Abstract
A first arm member and a second arm member are provided. The first arm member is positioned between a cam and a valve body to oscillate in synchronism with the rotation of the cam. The second arm member changes the angle of the first arm member in accordance with the rotation angle of a control shaft. The temperature prevailing in the neighborhood of the control shaft and cam is detected. The rotation angle of the control shaft is corrected so as to avoid the influence of the detected temperature.
Claims21
A variable valve mechanism that is capable of changing the operating angle and/or lift amount of a valve body of an internal combustion engine, the variable valve mechanism comprising:
- a control shaft whose status is controlled so as to change said operating angle and/or lift amount;
- a swinging arm that is positioned between a cam and a valve body to swing in synchronism with cam rotation, thereby transmitting the force of the cam to said valve body;
- an adjustment mechanism for changing the basic relative angle of said swinging arm in relation to said valve body in accordance with the status of said control shaft;
- temperature detection means for detecting or estimating the ambient temperature of said control shaft and said cam;
- and
- temperature correction means for correcting the status of said control shaft in accordance with said temperature and in order to avoid the influence of the temperature.
A variable valve mechanism that is capable of changing the operating angle and/or lift amount of a valve body of an internal combustion engine, the variable valve mechanism comprising:
- a control shaft whose status is controlled so as to change said operating angle and/or lift amount;
- an swinging arm that is positioned between a cam and a valve body to oscillate in synchronism with cam rotation, thereby transmitting the force of the cam to said valve body;
- and
- an adjustment mechanism for changing the basic relative angle of said swinging arm in relation to said valve body in accordance with the status of said control shaft,
- wherein a member for determining the distance between said control shaft and a camshaft and a member positioned between said control shaft and said cam are made of materials having the same linear expansion coefficient.
A variable valve mechanism that is capable of changing the operating angle and/or lift amount of a valve body of an internal combustion engine, the variable valve mechanism comprising:
- a control shaft whose status is controlled so as to change said operating angle and/or lift amount;
- a swinging arm that is positioned between a cam and a valve body to swing in synchronism with cam rotation, thereby transmitting the force of the cam to said valve body;
- an adjustment mechanism for changing the basic relative angle of said swinging arm in relation to said valve body in accordance with the status of said control shaft;
- temperature detection unit for detecting or estimating the ambient temperature of said control shaft and said cam;
- and
- temperature correction unit for correcting the status of said control shaft in accordance with said temperature and in order to avoid the influence of the temperature.
Dependencies are inferred from the claim text.