Valve gear with cylinder suspending mechanism of an internal combustion engine

A valve gear with a cylinder suspending mechanism of an internal combustion engine, comprising:

• a first rocker arm having a tip end connected to either one of an intake valve and an exhaust valve and pivotably supported on a first rocker shaft;
• a second rocker arm located at one side of said first rocker arm, pivotably supported on said first rocker shaft, and driven by a first cam formed in a camshaft;
• a third rocker arm located at the other side of said first rocker arm, pivotably supported on said first rocker shaft, and driven by a second cam formed in the camshaft and having a cam shape different from said first cam;
• a fourth rocker arm having a tip end connected to the other one of the intake valve and the exhaust valve and pivotably supported on a second rocker shaft that is disposed in parallel to said first rocker shaft;
• a fifth rocker arm located adjacent to said fourth rocker arm, pivotably supported on said second rocker shaft, and driven by a third cam;
• a first switching mechanism for switching connection and disconnection of said first rocker arm with respect to said second or third rocker arm;
• a second switching mechanism for switching connection and disconnection of said fourth rocker arm and said fifth rocker arm;
• and
• control means for controlling the switching of said first and second switching mechanisms,
• wherein, said first switching mechanism includes a first piston slidably fitted into a first cylinder formed in said first rocker arm, a second piston slidably fitted into a second cylinder formed in said first rocker arm, a first engaging projection extending from said second rocker arm and formed to be engageable with said first piston, and a second engaging projection extending from said third rocker arm and formed to be engageable with said second piston, and said first switching mechanism switches said first and second pistons between an engaging position and a nonengaging position with respect to said first and second engaging projections, and
• said second switching mechanism includes a third piston slidably fitted into a third cylinder formed in said fourth rocker arm and a third engaging projection extending from said fifth rocker arm and formed to be engageable with said third piston, and switches said third piston between an engaging position and a non-engaging position with respect to said third engaging projection.

A valve gear with a cylinder suspending mechanism of an internal combustion engine, comprising:

• a first rocker arm having a tip end connected to either one of an intake valve and an exhaust valve and pivotably supported on a first rocker shaft;
• a second rocker arm located at one side of said first rocker arm, pivotally supported on said first rocker shaft, and driven by a first cam formed in a camshaft;
• a third rocker arm located at the other side of said first rocker arm, pivotally supported on said first rocker shaft, and driven by a second cam formed in the camshaft and having a cam shape different from said first cam;
• a first switching mechanism for switching connection and disconnection of said first rocker arm with respect to said second or third rocker arm;
• and
• control means for controlling the switching of said first switching mechanism,
• wherein, said first switching mechanism includes a first piston slidably fitted into a first cylinder formed in said first rocker arm, a second piston slidably fitted into a second cylinder formed in said first rocker arm, a first engaging projection extending from said third rocker arm and formed to be engageable with said second piston, and a second engaging projection extending from said third rocker arm and formed to be engageable with said second piston,
• said first and second pistons are switched between an engaging position and a non-engaging position with respect to said first and second engaging projections,
• wherein said control means controls the switching of said first switching mechanism so as to activate any one of a first mode in which said first rocker arm is driven by said first cam, a second mode in which said first rocker arm is driven by said second cam, and a third mode in which said first rocker is rendered inoperative, and
• wherein said control means controls the switching of said first switching mechanism, such that in said first mode, said first piston is located in the engaging position with respect to said first engaging projection, and said second piston in the non-engaging position with respect to said second engaging projection, and
• in said third mode, said first piston is located in the non-engaging position with respect to said first engaging projection, and said second piston in the non-engaging position with respect to said second engaging projection.