Valve operating device of engine

Patent metadata

Field	Value
Publication number	US-9309786-B2
Application number	US-201414184346-A
Country	US
Kind code	B2
Filing date	Feb 19, 2014
Priority date	Feb 26, 2013
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A valve operating device for an engine is provided. The device includes at least two cam elements per one shaft. End face cams are formed in opposing end faces of two adjacent cam elements, and the end face cams respectively have protruding portions being formed offset in phase so that the protruding portions overlap in the axial directions when the two cam elements are close to each other. A control member is provided, the control member is projected to an actuated position at which the control member is projected to engage with the end face cams so as to separate the adjacent cam elements from each other when the cam elements are close to each other, and the control member is retreated to a non-actuated position at which the control member is retreated from the actuated position.

First claim

What is claimed is:

1. A valve operating device for an engine having a camshaft, the camshaft including a shaft and a cam element fitted onto the shaft to be integrally rotatable with the shaft and movable in axial directions along the shaft, the cam element being provided with a plurality of adjacent cam parts having a common base circle for one valve and having nose parts with different shapes, the cam part to open and close the valve being switchable by moving the cam element in the axial directions on the shaft, the valve operating device comprising:
at least two cam elements per one shaft,
wherein end face cams are formed in opposing end faces of two adjacent cam elements, and the end face cams respectively have protruding portions being formed offset in phase so that the protruding portions overlap in the axial directions when the two cam elements are close to each other, and
wherein a control member is provided, the control member is projected to an actuated position at which the control member is projected to engage with the end face cams so as to separate the adjacent cam elements from each other when the cam elements are close to each other, and the control member is retreated to a non-actuated position at which the control member is retreated from the actuated position.

2. The device of claim 1 , wherein second end face cams are formed in the other end faces of the two adjacent cam elements, and
wherein second control members are provided for the respective two cam elements, each of the second control members is projected to an actuated position at which the second control member is projected, in a state where the cam element is separated from the adjacent cam element, to engage with the second end face cam so as to move the cam element to be close to the adjacent cam element, and each of the second control members is retreated to a non-actuated position at which the second control member is retreated from the actuated position.

3. The device of claim 1 , wherein the engine includes a plurality of cylinders arranged in a line, the two cam elements are respectively provided for two adjacent cylinders of the plurality of cylinders, and the control member is arranged to be able to engage with the opposing end face cams of the two cam elements between the two cylinders.

4. The device of claim 3 , wherein second end face cams are formed in end faces of the two cam elements on the respective far sides, the two cam elements being provided for the cylinders located at both ends in the cylinder row, and
wherein second control members are provided for the respective two cam elements, each of the second control members is projected to an actuated position at which the second control member is projected, in a state where the cam element is separated from the adjacent cam element, to engage with the second end face cam so as to move the cam element to be close to the adjacent cam element, and each of the second control members is retreated to a non-actuated position at which the second control member is retreated from the actuated position.

Assignees

• Mazda Motor

Inventors

• Kashiwabara Takashi
• Noda Akihiro

Classifications

• F01L1/047 Primary

  Camshafts · CPC title

• F01L13/0036

  the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction · CPC title

• F01L2013/0052

  with cams provided on an axially slidable sleeve · CPC title

• F01L2820/031

  Electromagnets · CPC title

• F01L2001/0473

  Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod · CPC title