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A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber comprises: a valve drive device comprising a drive member and driving force transmission mechanism. The drive force transmission mechanism is configured to transmit a driving force f

A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber comprises: a valve drive device comprising a drive member and driving force transmission mechanism. The drive force transmission mechanism is configured to transmit a driving force from the drive member to the valve. The drive force transmission mechanism comprises a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift. At least part of the variable portion is positioned within in the transmission portion.

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What is claimed is: 1. A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member

What is claimed is: 1. A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member to the valve, the drive force transmission mechanism comprising a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift, wherein at least part of the variable portion is positioned within in the transmission portion; wherein the state of the transmission portion is changed by changing the position of the variable portion with respect to the transmission portion; and wherein the transmission portion includes an arm comprising a pair of bearing portions that are pivotally supported on a support shaft; wherein the variable portion comprises a control arm that is pivotally supported on an eccentric shaft which is formed on the support shaft between the pair of bearing portions. 2. A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member to the valve, the drive force transmission mechanism comprising a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift, wherein at least part of the variable portion is positioned within in the transmission portion; wherein the transmission portion includes a swing arm having a swing cam surface, the swing arm being supported for pivoting movement about a swing arm support shaft, the swing arm being driven to pivot by the drive member and the transmission portion comprises a rocker arm that is supported for pivoting movement about a rocker arm support shaft; and wherein the variable portion comprises a control arm that is supported for pivoting movement by the rocker arm support shaft and wherein the rocker arm has a recessed surface and the rocker arm is pivoted by the swing cam surface through the control arm, which is interposed between the rocker arm and the swing arm, the opening duration of the valve or the amount of valve lift being determined by the shape of the swing cam surface. 3. The valve train device according to claim 2, wherein the variable portion is configured to allow a contact point between the control arm and the swing cam surface and another contact point between the control arm and the recessed surface to continuously vary to thereby continuously change the state of the driving force from the drive member being transmitted from the first swing arm to the first rocker arm. 4. The valve train device according to claim 3, wherein at least a portion of the control arm is positioned within the first rocker arm. 5. The valve train device according to claim 4, wherein the rocker arm includes left and right rocker arm portions supported on the rocker arm support shaft, a coupling portion for coupling the rocker arm portions together, the coupling portion being located on a lower side of the left and right rocker arm portions, and wherein a proximal end of the control arm is pivotally supported on an eccentric shaft which is formed on the rocker support shaft between the left and right rocker arm portions, and wherein a portion of the control arm on its proximal end side is positioned, at least partially, in a space defined by the coupling portion and the left and right rocker arm portions. 6. A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member to the valve, the drive force transmission mechanism comprising a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift, wherein at least part of the variable portion is positioned within in the transmission portion; wherein the transmission portion includes a swing arm that is pivotally supported on a swing arm support shaft, the swing arm forming a swing cam surface and wherein the variable portion comprises a control arm that is pivotally supported on the swing arm support shaft; and wherein the swing arm is driven by the drive member through the control arm, which is interposed between the drive member and the swing arm and wherein the variable portion allows a contact point between the control arm and the swing arm to be continuously varied, thereby continuously changing the state of the driving force from the drive member being transmitted from the swing arm to the rocker arm and wherein at least part of the control arm is positioned within lateral edges of the swing arm. 7. The valve train device according to claim 6, wherein the swing arm includes left and right swing arm portions supported by swing arm support shaft; and a coupling portion for coupling bottom portions of the left and right swing arm portions, wherein a proximal end of the control arm is swingably supported by an eccentric shaft which is formed on the swing arm support shaft and positioned between the left and right swing arm portions, and wherein a portion of the second control arm on its proximal end side is accommodated in a space defined by the coupling portion and the left and right swing arm portions. 8. A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member to the valve, the drive force transmission mechanism comprising a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift, wherein at least part of the variable portion is positioned within in the transmission portion; and wherein the transmission portion includes a cam surface positioned on a stationary cam, a swing arm which has a distal end that comes into contact with the cam surface and driven to pivot about an axis by the drive member through a control arm that is interposed between the drive member and swing arm; and a rocker arm that coupled to a proximal end of the swing arm, the rocker arm having a proximal end that pivots on a rocker arm support axis, the rocker arm driven to pivot by the drive member through the control arm and the swing arm, and wherein the variable portion is configured to allow a contact point between the third control arm and the third swing arm to continuously vary, thereby continuously changing the state of the driving force from the drive member being transmitted from the third swing arm to the third rocker arm, and wherein at least part of the third control arm is positioned within the lateral sides of the third rocker arm. 9. The valve train device according to claim 8, wherein the rocker arm includes left and right rocker arm portions that are supported pm the rocker arm support shaft; and a coupling portion for coupling the rocker arm portions, and wherein the proximal end of the control arm is swingably supported on an eccentric shaft which is formed on the rocker arm support shaft and is positioned between the left and right rocker arm portions, and a portion of the control arm on its proximal end side is accommodated in a space defined by the coupling portion and the left and right rocker arm portions. 10. A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member to the valve, the drive force transmission mechanism comprising a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift, wherein at least part of the variable portion is positioned within in the transmission portion; and wherein the transmission portion includes a rocker arm having a contact surface and being pivotally supported on a rocker arm support shaft and driven to pivot by the drive member through a control arm interposed between the drive member and the rocker arm, and wherein the variable portion is configured to allow a contact point between the control arm and the contact surface to continuously vary, thereby continuously changing the state of the driving force being transmitted from the drive member to the rocker arm, and wherein at least part of the control arm is positioned within the lateral sides of the rocker arm. 11. The valve train device for an engine according to claim 10, wherein the rocker arm includes left and right rocker arm portions supported on the rocker arm support shaft; and a coupling portion for coupling bottom portions of the left and right rocker arm portions, and wherein a proximal end of the control arm is pivotally supported on an eccentric shaft which is formed on the rocker arm support shaft and between the left and right rocker arm portions, and at least a portion of the control arm on its proximal end side is positioned within in the space defined by the coupling portion and the left and right rocker arm portions. 12. A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member to the valve, the drive force transmission mechanism comprising a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift, wherein at least part of the variable portion is positioned within in the transmission portion; and wherein the transmission portion includes a pivoting rocker arm and having a first surface and a second surface configured to depress a valve lifter which is attached to the valve, wherein the rocker arm is driven to pivot by the drive member through a control arm interposed between the first surface of the rocker arm and the drive member, and wherein the variable portion is configured to allow a contact point between the control arm and the first surface to continuously vary, thereby continuously changing the state of the driving force being transmitted from the drive member to the rocker arm, and wherein at least part of the control arm is positioned within in with the lateral sides of the rocker arm. 13. The valve train device according to claim 12, wherein the rocker arm includes left and right rocker arm portions supported on a rocker arm support shaft; and a coupling portion for coupling bottom portions of the left and right rocker arm portions, and wherein a proximal end of the control arm is pivotally supported on an eccentric shaft that is formed on the rocker arm support shaft and is positioned between the left and right rocker arm portions, and a portion of the control arm on its proximal end side is positioned in a space defined between the coupling portion and the left and right rocker arm portions.