Variable valve mechanism

A variable valve mechanism, comprising:

• a rotating cam that is provided on a camshaft;
• a swing arm that contacts with the rotating cam to swing;
• a drive arm that drives a valve in conjunction with the swing arm;
• a variable arm that turns the drive arm around a swing axis of the swing arm;
• an actuator that drives the variable arm;
• and
• a cam device that is provided between the swing arm and the drive arm,
• wherein the variable arm is provided so as to be able to rotate relatively around the swing axis of the swing arm,
• wherein the cam device changes the initial position of the drive arm with respect to the swing arm accompanying the turning of the drive arm,
• wherein the variable arm and the swing arm are supported so as to be able to rotate relatively to each other on a support shaft,
• wherein the control shaft is separate from the support shaft, is provided at one of a side of and below the variable arm, and is linked to the actuator, and
• wherein a control cam that drives the variable arm is provided on the control shaft.

A variable valve mechanism, comprising:

• a rotating cam that is provided on a camshaft;
• a swing arm that contacts with the rotating cam to swing;
• a drive arm that drives a valve in conjunction with the swing arm;
• a variable arm that turns the drive arm around a swing axis of the swing arm;
• an actuator that drives the variable arm;
• and
• a cam device that is provided between the swing arm and the drive arm,
• wherein the variable arm is provided so as to be able to rotate relatively around the swing axis of the swing arm,
• wherein the cam device changes the initial position of the drive arm with respect to the swing arm accompanying the turning of the drive arm,
• wherein the variable arm and the swing arm are supported so as to be able to rotate relatively to each other on a support shaft,
• wherein the control shaft is separate from the support shaft, is provided at one of a side of and and below the variable arm, and is linked to the actuator,
• wherein a control cam that drives the variable arm is provided on the control shaft, and
• wherein a shim is interposed between the control cam and the variable arm.

A variable valve mechanism, comprising:

• a rotating cam that is provided on a camshaft;
• a swing arm that contacts with the rotating cam to swing;
• a drive arm that drives a valve in conjunction with the swing arm;
• a variable arm that turns the drive arm around a swing axis of the swing arm,
• an actuator that drives the variable arm with a control shaft which is rotated by the actuator;
• and
• a cam device that is provided between the swing arm and the drive arm,
• wherein the variable arm is provided so as to be able to rotate relatively around the swing axis of the swing arm,
• wherein the cam device changes the initial position of the drive arm with respect to the swing arm accompanying the turning of the drive arm, and
• wherein the swing arm and the variable arm are supported by the control shaft.