Gear mechanism of power transmitting system
First Claim
1. A gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein said damping member comprises a friction damping member and said second rotating member comprises a rotary shaft, and said friction damping member is disposed between said first rotating member and said rotary shaft.
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Accused Products
Abstract
The present invention provides a gear mechanism of a power transmitting system, which includes a crank gear operatively coupled with a crankshaft, and a first driven gear that is coupled with a first balance shaft via a damping mechanism that allows relative rotation between the driven gear and the balance shaft. The damping mechanism includes a friction damper that generates frictional force when the first driven gear and a counter gear fixed to the first balance shaft rotate relative to each other within a predetermined rotational phase range or angle, and a stopper rubber or rubbers that elastically deforms to generate elastic force when the first driven gear and the first balance shaft rotate relative to each other beyond the predetermined rotational angle.
39 Citations
20 Claims
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1. A gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein said damping member comprises a friction damping member and said second rotating member comprises a rotary shaft, and said friction damping member is disposed between said first rotating member and said rotary shaft.
- 2. A gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein said elastic member comprises a main deformation portion and a sub deformation portion, and the main deformation portion has a greater deformation limit than the sub deformation portion.
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5. A gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein said damping mechanism comprises a plurality of said elastic members, each of which is provided on one of said first and second rotating members, and a plurality of abutting members corresponding to the respective elastic members, each of which is provided on the other of said first and second rotating members for abutting on the corresponding elastic members to cause elastic deformation thereof when the first and second rotating members rotate relative to each other beyond the predetermined relative rotational angle, and the elastic members are located with respect to the first and second rotating members such that different angles of relative rotation between the first and second rotating members are formed when the respective elastic members successively abut on the corresponding abutting members.
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6. A gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein said damping mechanism comprises a plurality of said elastic members, each of which is provided on one of said first and second rotating members, and a plurality of abutting members corresponding to the respective elastic members, each of which is provided on the other of said first and second rotating members for abutting on the corresponding elastic members to cause elastic deformation thereof when the first and second rotating members rotate relative to each other beyond the predetermined relative rotational angle, and the predetermined relative rotational angle is defined by the sum of angles by which each said abutting member is spaced from corresponding end faces of said at least one elastic member which face the abutting member, as viewed in a direction of rotation of said rotating members.
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7. A gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein said damping mechanism comprises a plurality of first elastic members, each of which is provided on one of said first and second rotating members, a plurality of abutting members corresponding to the respective first elastic members, each of which is provided on the other of said first and second rotating members, and a plurality of second elastic members that are interposed between corresponding end faces of the first elastic members and the abutting members;
- and each of the first elastic members has a spring constant and a damping coefficient that are smaller than a spring constant and a damping coefficient of each of the second elastic members.
- 8. A gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein at least one of said first and second rotating members comprises a gear meshing with a respective counter gear.
- 15. An internal combustion engine comprising a crankshaft, a first balance shaft and a gear mechanism of a power transmitting system comprising first and second rotating members disposed coaxially with each other, and a damping mechanism interposed therebetween, said damping mechanism including a damping member that generates damping force for limiting relative rotation between the first and second rotating members, and at least one elastic member that elastically deforms mainly when an angle of relative rotation between the first and second rotating members exceeds a predetermined rotational angle, so as to apply elastic force onto the first and second rotating members in a direction opposite to that of the relative rotation, wherein said first balance shaft is driven by rotational torque of said crankshaft.
Specification